Changeset 1765 in MondoRescue for branches/2.2.5/mindi-busybox/shell/hush.c


Ignore:
Timestamp:
Nov 4, 2007, 3:16:40 AM (16 years ago)
Author:
Bruno Cornec
Message:

Update to busybox 1.7.2

File:
1 edited

Legend:

Unmodified
Added
Removed
  • branches/2.2.5/mindi-busybox/shell/hush.c

    r821 r1765  
    2121 *
    2222 * Other credits:
    23  *      simple_itoa() was lifted from boa-0.93.15
    2423 *      b_addchr() derived from similar w_addchar function in glibc-2.2
    2524 *      setup_redirect(), redirect_opt_num(), and big chunks of main()
    26  *        and many builtins derived from contributions by Erik Andersen
     25 *      and many builtins derived from contributions by Erik Andersen
    2726 *      miscellaneous bugfixes from Matt Kraai
    2827 *
     
    3938 *
    4039 * Bash grammar not implemented: (how many of these were in original sh?)
    41  *      $@ (those sure look like weird quoting rules)
    4240 *      $_
    4341 *      ! negation operator for pipes
     
    5351 *      Functions
    5452 * Major bugs:
    55  *      job handling woefully incomplete and buggy
     53 *      job handling woefully incomplete and buggy (improved --vda)
    5654 *      reserved word execution woefully incomplete and buggy
    5755 * to-do:
     
    7371 *      more testing, especially quoting rules and redirection
    7472 *      document how quoting rules not precisely followed for variable assignments
    75  *      maybe change map[] to use 2-bit entries
     73 *      maybe change charmap[] to use 2-bit entries
    7674 *      (eventually) remove all the printf's
    7775 *
     
    7977 */
    8078
    81 #include "busybox.h"
    82 #include <ctype.h>     /* isalpha, isdigit */
    83 #include <unistd.h>    /* getpid */
    84 #include <stdlib.h>    /* getenv, atoi */
    85 #include <string.h>    /* strchr */
    86 #include <stdio.h>     /* popen etc. */
     79
    8780#include <glob.h>      /* glob, of course */
    88 #include <stdarg.h>    /* va_list */
    89 #include <errno.h>
    90 #include <fcntl.h>
    9181#include <getopt.h>    /* should be pretty obvious */
    92 
    93 #include <sys/stat.h>  /* ulimit */
    94 #include <sys/types.h>
    95 #include <sys/wait.h>
    96 #include <signal.h>
    97 
    9882/* #include <dmalloc.h> */
    99 /* #define DEBUG_SHELL */
    100 
    101 #if 1
    102 #include "cmdedit.h"
    103 #else
    104 #define bb_applet_name "hush"
    105 //#include "standalone.h"
    106 #define hush_main main
    107 #undef CONFIG_FEATURE_SH_FANCY_PROMPT
    108 #define BB_BANNER ""
    109 #endif
    110 #define SPECIAL_VAR_SYMBOL 03
    111 #define FLAG_EXIT_FROM_LOOP 1
    112 #define FLAG_PARSE_SEMICOLON (1 << 1)       /* symbol ';' is special for parser */
    113 #define FLAG_REPARSING       (1 << 2)       /* >=2nd pass */
     83
     84extern char **environ; /* This is in <unistd.h>, but protected with __USE_GNU */
     85
     86#include "busybox.h" /* for struct bb_applet */
     87
     88
     89/* If you comment out one of these below, it will be #defined later
     90 * to perform debug printfs to stderr: */
     91#define debug_printf(...)        do {} while (0)
     92/* Finer-grained debug switches */
     93#define debug_printf_parse(...)  do {} while (0)
     94#define debug_print_tree(a, b)   do {} while (0)
     95#define debug_printf_exec(...)   do {} while (0)
     96#define debug_printf_jobs(...)   do {} while (0)
     97#define debug_printf_expand(...) do {} while (0)
     98#define debug_printf_clean(...)  do {} while (0)
     99
     100#ifndef debug_printf
     101#define debug_printf(...) fprintf(stderr, __VA_ARGS__)
     102#endif
     103
     104#ifndef debug_printf_parse
     105#define debug_printf_parse(...) fprintf(stderr, __VA_ARGS__)
     106#endif
     107
     108#ifndef debug_printf_exec
     109#define debug_printf_exec(...) fprintf(stderr, __VA_ARGS__)
     110#endif
     111
     112#ifndef debug_printf_jobs
     113#define debug_printf_jobs(...) fprintf(stderr, __VA_ARGS__)
     114#define DEBUG_SHELL_JOBS 1
     115#endif
     116
     117#ifndef debug_printf_expand
     118#define debug_printf_expand(...) fprintf(stderr, __VA_ARGS__)
     119#define DEBUG_EXPAND 1
     120#endif
     121
     122/* Keep unconditionally on for now */
     123#define ENABLE_HUSH_DEBUG 1
     124
     125#ifndef debug_printf_clean
     126/* broken, of course, but OK for testing */
     127static const char *indenter(int i)
     128{
     129    static const char blanks[] ALIGN1 =
     130        "                                    ";
     131    return &blanks[sizeof(blanks) - i - 1];
     132}
     133#define debug_printf_clean(...) fprintf(stderr, __VA_ARGS__)
     134#define DEBUG_CLEAN 1
     135#endif
     136
     137
     138#if !ENABLE_HUSH_INTERACTIVE
     139#undef ENABLE_FEATURE_EDITING
     140#define ENABLE_FEATURE_EDITING 0
     141#undef ENABLE_FEATURE_EDITING_FANCY_PROMPT
     142#define ENABLE_FEATURE_EDITING_FANCY_PROMPT 0
     143#endif
     144
     145#define SPECIAL_VAR_SYMBOL   3
     146
     147#define PARSEFLAG_EXIT_FROM_LOOP 1
     148#define PARSEFLAG_SEMICOLON      (1 << 1)  /* symbol ';' is special for parser */
     149#define PARSEFLAG_REPARSING      (1 << 2)  /* >= 2nd pass */
    114150
    115151typedef enum {
     
    123159/* The descrip member of this structure is only used to make debugging
    124160 * output pretty */
    125 static const struct {int mode; int default_fd; const char *descrip;} redir_table[] = {
     161static const struct {
     162    int mode;
     163    signed char default_fd;
     164    char descrip[3];
     165} redir_table[] = {
    126166    { 0,                         0, "()" },
    127167    { O_RDONLY,                  0, "<"  },
     
    142182typedef enum {
    143183    RES_NONE  = 0,
     184#if ENABLE_HUSH_IF
    144185    RES_IF    = 1,
    145186    RES_THEN  = 2,
     
    147188    RES_ELSE  = 4,
    148189    RES_FI    = 5,
     190#endif
     191#if ENABLE_HUSH_LOOPS
    149192    RES_FOR   = 6,
    150193    RES_WHILE = 7,
     
    152195    RES_DO    = 9,
    153196    RES_DONE  = 10,
    154     RES_XXXX  = 11,
    155     RES_IN    = 12,
     197    RES_IN    = 11,
     198#endif
     199    RES_XXXX  = 12,
    156200    RES_SNTX  = 13
    157201} reserved_style;
    158 #define FLAG_END   (1<<RES_NONE)
    159 #define FLAG_IF    (1<<RES_IF)
    160 #define FLAG_THEN  (1<<RES_THEN)
    161 #define FLAG_ELIF  (1<<RES_ELIF)
    162 #define FLAG_ELSE  (1<<RES_ELSE)
    163 #define FLAG_FI    (1<<RES_FI)
    164 #define FLAG_FOR   (1<<RES_FOR)
    165 #define FLAG_WHILE (1<<RES_WHILE)
    166 #define FLAG_UNTIL (1<<RES_UNTIL)
    167 #define FLAG_DO    (1<<RES_DO)
    168 #define FLAG_DONE  (1<<RES_DONE)
    169 #define FLAG_IN    (1<<RES_IN)
    170 #define FLAG_START (1<<RES_XXXX)
     202enum {
     203    FLAG_END   = (1 << RES_NONE ),
     204#if ENABLE_HUSH_IF
     205    FLAG_IF    = (1 << RES_IF   ),
     206    FLAG_THEN  = (1 << RES_THEN ),
     207    FLAG_ELIF  = (1 << RES_ELIF ),
     208    FLAG_ELSE  = (1 << RES_ELSE ),
     209    FLAG_FI    = (1 << RES_FI   ),
     210#endif
     211#if ENABLE_HUSH_LOOPS
     212    FLAG_FOR   = (1 << RES_FOR  ),
     213    FLAG_WHILE = (1 << RES_WHILE),
     214    FLAG_UNTIL = (1 << RES_UNTIL),
     215    FLAG_DO    = (1 << RES_DO   ),
     216    FLAG_DONE  = (1 << RES_DONE ),
     217    FLAG_IN    = (1 << RES_IN   ),
     218#endif
     219    FLAG_START = (1 << RES_XXXX ),
     220};
    171221
    172222/* This holds pointers to the various results of parsing */
     
    176226    struct pipe *pipe;
    177227    struct redir_struct *pending_redirect;
    178     reserved_style w;
    179     int old_flag;               /* for figuring out valid reserved words */
     228    smallint res_w;
     229    smallint parse_type;        /* bitmask of PARSEFLAG_xxx, defines type of parser : ";$" common or special symbol */
     230    int old_flag;               /* bitmask of FLAG_xxx, for figuring out valid reserved words */
    180231    struct p_context *stack;
    181     int type;           /* define type of parser : ";$" common or special symbol */
    182232    /* How about quoting status? */
    183233};
    184234
    185235struct redir_struct {
    186     redir_type type;            /* type of redirection */
    187     int fd;                     /* file descriptor being redirected */
    188     int dup;                    /* -1, or file descriptor being duplicated */
    189     struct redir_struct *next;  /* pointer to the next redirect in the list */
    190     glob_t word;                /* *word.gl_pathv is the filename */
     236    struct redir_struct *next;  /* pointer to the next redirect in the list */
     237    redir_type type;            /* type of redirection */
     238    int fd;                     /* file descriptor being redirected */
     239    int dup;                    /* -1, or file descriptor being duplicated */
     240    glob_t word;                /* *word.gl_pathv is the filename */
    191241};
    192242
    193243struct child_prog {
    194     pid_t pid;                  /* 0 if exited */
    195     char **argv;                /* program name and arguments */
    196     struct pipe *group;         /* if non-NULL, first in group or subshell */
    197     int subshell;               /* flag, non-zero if group must be forked */
    198     struct redir_struct *redirects; /* I/O redirections */
    199     glob_t glob_result;         /* result of parameter globbing */
    200     int is_stopped;             /* is the program currently running? */
    201     struct pipe *family;        /* pointer back to the child's parent pipe */
    202     int sp;             /* number of SPECIAL_VAR_SYMBOL */
    203     int type;
     244    pid_t pid;                  /* 0 if exited */
     245    char **argv;                /* program name and arguments */
     246    struct pipe *group;         /* if non-NULL, first in group or subshell */
     247    smallint subshell;          /* flag, non-zero if group must be forked */
     248    smallint is_stopped;        /* is the program currently running? */
     249    struct redir_struct *redirects; /* I/O redirections */
     250    glob_t glob_result;         /* result of parameter globbing */
     251    struct pipe *family;        /* pointer back to the child's parent pipe */
     252    //sp counting seems to be broken... so commented out, grep for '//sp:'
     253    //sp: int sp;               /* number of SPECIAL_VAR_SYMBOL */
     254    //seems to be unused, grep for '//pt:'
     255    //pt: int parse_type;
    204256};
     257/* argv vector may contain variable references (^Cvar^C, ^C0^C etc)
     258 * and on execution these are substituted with their values.
     259 * Substitution can make _several_ words out of one argv[n]!
     260 * Example: argv[0]=='.^C*^C.' here: echo .$*.
     261 */
    205262
    206263struct pipe {
    207     int jobid;                  /* job number */
    208     int num_progs;              /* total number of programs in job */
    209     int running_progs;          /* number of programs running */
    210     char *text;                 /* name of job */
    211     char *cmdbuf;               /* buffer various argv's point into */
    212     pid_t pgrp;                 /* process group ID for the job */
    213     struct child_prog *progs;   /* array of commands in pipe */
    214     struct pipe *next;          /* to track background commands */
    215     int stopped_progs;          /* number of programs alive, but stopped */
    216     int job_context;            /* bitmask defining current context */
    217     pipe_style followup;        /* PIPE_BG, PIPE_SEQ, PIPE_OR, PIPE_AND */
    218     reserved_style r_mode;      /* supports if, for, while, until */
     264    struct pipe *next;
     265    int num_progs;              /* total number of programs in job */
     266    int running_progs;          /* number of programs running (not exited) */
     267    int stopped_progs;          /* number of programs alive, but stopped */
     268#if ENABLE_HUSH_JOB
     269    int jobid;                  /* job number */
     270    pid_t pgrp;                 /* process group ID for the job */
     271    char *cmdtext;              /* name of job */
     272#endif
     273    char *cmdbuf;               /* buffer various argv's point into */
     274    struct child_prog *progs;   /* array of commands in pipe */
     275    int job_context;            /* bitmask defining current context */
     276    smallint followup;          /* PIPE_BG, PIPE_SEQ, PIPE_OR, PIPE_AND */
     277    smallint res_word;          /* needed for if, for, while, until... */
    219278};
    220279
    221280struct close_me {
     281    struct close_me *next;
    222282    int fd;
    223     struct close_me *next;
    224283};
    225284
    226 struct variables {
    227     char *name;
    228     char *value;
    229     int flg_export;
    230     int flg_read_only;
    231     struct variables *next;
     285/* On program start, environ points to initial environment.
     286 * putenv adds new pointers into it, unsetenv removes them.
     287 * Neither of these (de)allocates the strings.
     288 * setenv allocates new strings in malloc space and does putenv,
     289 * and thus setenv is unusable (leaky) for shell's purposes */
     290#define setenv(...) setenv_is_leaky_dont_use()
     291struct variable {
     292    struct variable *next;
     293    char *varstr;        /* points to "name=" portion */
     294    int max_len;         /* if > 0, name is part of initial env; else name is malloced */
     295    smallint flg_export; /* putenv should be done on this var */
     296    smallint flg_read_only;
    232297};
    233 
    234 /* globals, connect us to the outside world
    235  * the first three support $?, $#, and $1 */
    236 static char **global_argv;
    237 static int global_argc;
    238 static int last_return_code;
    239 extern char **environ; /* This is in <unistd.h>, but protected with __USE_GNU */
    240 
    241 /* "globals" within this file */
    242 static char *ifs;
    243 static unsigned char map[256];
    244 static int fake_mode;
    245 static int interactive;
    246 static struct close_me *close_me_head;
    247 static const char *cwd;
    248 static struct pipe *job_list;
    249 static unsigned int last_bg_pid;
    250 static int last_jobid;
    251 static unsigned int shell_terminal;
    252 static char *PS1;
    253 static char *PS2;
    254 static struct variables shell_ver = { "HUSH_VERSION", "0.01", 1, 1, 0 };
    255 static struct variables *top_vars = &shell_ver;
    256 
    257 
    258 #define B_CHUNK (100)
    259 #define B_NOSPAC 1
    260298
    261299typedef struct {
     
    267305} o_string;
    268306#define NULL_O_STRING {NULL,0,0,0,0}
    269 /* used for initialization:
    270     o_string foo = NULL_O_STRING; */
     307/* used for initialization: o_string foo = NULL_O_STRING; */
    271308
    272309/* I can almost use ordinary FILE *.  Is open_memstream() universally
     
    274311struct in_str {
    275312    const char *p;
     313    /* eof_flag=1: last char in ->p is really an EOF */
     314    char eof_flag; /* meaningless if ->p == NULL */
    276315    char peek_buf[2];
    277     int __promptme;
    278     int promptmode;
     316#if ENABLE_HUSH_INTERACTIVE
     317    smallint promptme;
     318    smallint promptmode; /* 0: PS1, 1: PS2 */
     319#endif
    279320    FILE *file;
    280321    int (*get) (struct in_str *);
     
    284325#define b_peek(input) ((input)->peek(input))
    285326
     327enum {
     328    CHAR_ORDINARY           = 0,
     329    CHAR_ORDINARY_IF_QUOTED = 1, /* example: *, # */
     330    CHAR_IFS                = 2, /* treated as ordinary if quoted */
     331    CHAR_SPECIAL            = 3, /* example: $ */
     332};
     333
     334#define HUSH_VER_STR "0.02"
     335
     336/* "Globals" within this file */
     337
     338/* Sorted roughly by size (smaller offsets == smaller code) */
     339struct globals {
     340#if ENABLE_HUSH_INTERACTIVE
     341    /* 'interactive_fd' is a fd# open to ctty, if we have one
     342     * _AND_ if we decided to act interactively */
     343    int interactive_fd;
     344    const char *PS1;
     345    const char *PS2;
     346#endif
     347#if ENABLE_FEATURE_EDITING
     348    line_input_t *line_input_state;
     349#endif
     350#if ENABLE_HUSH_JOB
     351    int run_list_level;
     352    pid_t saved_task_pgrp;
     353    pid_t saved_tty_pgrp;
     354    int last_jobid;
     355    struct pipe *job_list;
     356    struct pipe *toplevel_list;
     357    smallint ctrl_z_flag;
     358#endif
     359    smallint fake_mode;
     360    /* these three support $?, $#, and $1 */
     361    char **global_argv;
     362    int global_argc;
     363    int last_return_code;
     364    const char *ifs;
     365    struct close_me *close_me_head;
     366    const char *cwd;
     367    unsigned last_bg_pid;
     368    struct variable *top_var; /* = &shell_ver (set in main()) */
     369    struct variable shell_ver;
     370#if ENABLE_FEATURE_SH_STANDALONE
     371    struct nofork_save_area nofork_save;
     372#endif
     373#if ENABLE_HUSH_JOB
     374    sigjmp_buf toplevel_jb;
     375#endif
     376    unsigned char charmap[256];
     377    char user_input_buf[ENABLE_FEATURE_EDITING ? BUFSIZ : 2];
     378};
     379
     380#define G (*ptr_to_globals)
     381
     382#if !ENABLE_HUSH_INTERACTIVE
     383enum { interactive_fd = 0 };
     384#endif
     385#if !ENABLE_HUSH_JOB
     386enum { run_list_level = 0 };
     387#endif
     388
     389#if ENABLE_HUSH_INTERACTIVE
     390#define interactive_fd   (G.interactive_fd  )
     391#define PS1              (G.PS1             )
     392#define PS2              (G.PS2             )
     393#endif
     394#if ENABLE_FEATURE_EDITING
     395#define line_input_state (G.line_input_state)
     396#endif
     397#if ENABLE_HUSH_JOB
     398#define run_list_level   (G.run_list_level  )
     399#define saved_task_pgrp  (G.saved_task_pgrp )
     400#define saved_tty_pgrp   (G.saved_tty_pgrp  )
     401#define last_jobid       (G.last_jobid      )
     402#define job_list         (G.job_list        )
     403#define toplevel_list    (G.toplevel_list   )
     404#define toplevel_jb      (G.toplevel_jb     )
     405#define ctrl_z_flag      (G.ctrl_z_flag     )
     406#endif /* JOB */
     407#define global_argv      (G.global_argv     )
     408#define global_argc      (G.global_argc     )
     409#define last_return_code (G.last_return_code)
     410#define ifs              (G.ifs             )
     411#define fake_mode        (G.fake_mode       )
     412#define close_me_head    (G.close_me_head   )
     413#define cwd              (G.cwd             )
     414#define last_bg_pid      (G.last_bg_pid     )
     415#define top_var          (G.top_var         )
     416#define shell_ver        (G.shell_ver       )
     417#if ENABLE_FEATURE_SH_STANDALONE
     418#define nofork_save      (G.nofork_save     )
     419#endif
     420#if ENABLE_HUSH_JOB
     421#define toplevel_jb      (G.toplevel_jb     )
     422#endif
     423#define charmap          (G.charmap         )
     424#define user_input_buf   (G.user_input_buf  )
     425
     426
     427#define B_CHUNK  100
     428#define B_NOSPAC 1
    286429#define JOB_STATUS_FORMAT "[%d] %-22s %.40s\n"
    287430
    288 struct built_in_command {
    289     const char *cmd;            /* name */
    290     const char *descr;          /* description */
    291     int (*function) (struct child_prog *);  /* function ptr */
    292 };
    293 
    294 /* belongs in busybox.h */
    295 static inline int max(int a, int b) {
    296     return (a>b)?a:b;
    297 }
    298 
    299 /* This should be in utility.c */
    300 #ifdef DEBUG_SHELL
    301 static void debug_printf(const char *format, ...)
    302 {
    303     va_list args;
    304     va_start(args, format);
    305     vfprintf(stderr, format, args);
    306     va_end(args);
    307 }
     431#if 1
     432/* Normal */
     433static void syntax(const char *msg)
     434{
     435    /* Was using fancy stuff:
     436     * (interactive_fd ? bb_error_msg : bb_error_msg_and_die)(...params...)
     437     * but it SEGVs. ?! Oh well... explicit temp ptr works around that */
     438    void (*fp)(const char *s, ...);
     439
     440    fp = (interactive_fd ? bb_error_msg : bb_error_msg_and_die);
     441    fp(msg ? "%s: %s" : "syntax error", "syntax error", msg);
     442}
     443
    308444#else
    309 static inline void debug_printf(const char *format ATTRIBUTE_UNUSED, ...) { }
    310 #endif
    311 #define final_printf debug_printf
    312 
    313 static void __syntax(char *file, int line) {
    314     bb_error_msg("syntax error %s:%d", file, line);
    315 }
    316 #define syntax() __syntax(__FILE__, __LINE__)
     445/* Debug */
     446static void syntax_lineno(int line)
     447{
     448    void (*fp)(const char *s, ...);
     449
     450    fp = (interactive_fd ? bb_error_msg : bb_error_msg_and_die);
     451    fp("syntax error hush.c:%d", line);
     452}
     453#define syntax(str) syntax_lineno(__LINE__)
     454#endif
    317455
    318456/* Index of subroutines: */
    319457/*   function prototypes for builtins */
    320 static int builtin_cd(struct child_prog *child);
    321 static int builtin_env(struct child_prog *child);
    322 static int builtin_eval(struct child_prog *child);
    323 static int builtin_exec(struct child_prog *child);
    324 static int builtin_exit(struct child_prog *child);
    325 static int builtin_export(struct child_prog *child);
    326 static int builtin_fg_bg(struct child_prog *child);
    327 static int builtin_help(struct child_prog *child);
    328 static int builtin_jobs(struct child_prog *child);
    329 static int builtin_pwd(struct child_prog *child);
    330 static int builtin_read(struct child_prog *child);
    331 static int builtin_set(struct child_prog *child);
    332 static int builtin_shift(struct child_prog *child);
    333 static int builtin_source(struct child_prog *child);
    334 static int builtin_umask(struct child_prog *child);
    335 static int builtin_unset(struct child_prog *child);
    336 static int builtin_not_written(struct child_prog *child);
     458static int builtin_cd(char **argv);
     459static int builtin_eval(char **argv);
     460static int builtin_exec(char **argv);
     461static int builtin_exit(char **argv);
     462static int builtin_export(char **argv);
     463#if ENABLE_HUSH_JOB
     464static int builtin_fg_bg(char **argv);
     465static int builtin_jobs(char **argv);
     466#endif
     467#if ENABLE_HUSH_HELP
     468static int builtin_help(char **argv);
     469#endif
     470static int builtin_pwd(char **argv);
     471static int builtin_read(char **argv);
     472static int builtin_set(char **argv);
     473static int builtin_shift(char **argv);
     474static int builtin_source(char **argv);
     475static int builtin_umask(char **argv);
     476static int builtin_unset(char **argv);
     477//static int builtin_not_written(char **argv);
    337478/*   o_string manipulation: */
    338479static int b_check_space(o_string *o, int len);
     
    340481static void b_reset(o_string *o);
    341482static int b_addqchr(o_string *o, int ch, int quote);
    342 static int b_adduint(o_string *o, unsigned int i);
    343483/*  in_str manipulations: */
    344484static int static_get(struct in_str *i);
     
    353493static void close_all(void);
    354494/*  "run" the final data structures: */
    355 static char *indenter(int i);
     495#if !defined(DEBUG_CLEAN)
     496#define free_pipe_list(head, indent) free_pipe_list(head)
     497#define free_pipe(pi, indent)        free_pipe(pi)
     498#endif
    356499static int free_pipe_list(struct pipe *head, int indent);
    357500static int free_pipe(struct pipe *pi, int indent);
     
    359502static int setup_redirects(struct child_prog *prog, int squirrel[]);
    360503static int run_list_real(struct pipe *pi);
     504static void pseudo_exec_argv(char **argv) ATTRIBUTE_NORETURN;
    361505static void pseudo_exec(struct child_prog *child) ATTRIBUTE_NORETURN;
    362506static int run_pipe_real(struct pipe *pi);
     
    376520static int redirect_dup_num(struct in_str *input);
    377521static int redirect_opt_num(o_string *o);
    378 static int process_command_subs(o_string *dest, struct p_context *ctx, struct in_str *input, int subst_end);
     522#if ENABLE_HUSH_TICK
     523static int process_command_subs(o_string *dest, struct p_context *ctx, struct in_str *input, const char *subst_end);
     524#endif
    379525static int parse_group(o_string *dest, struct p_context *ctx, struct in_str *input, int ch);
    380 static char *lookup_param(char *src);
    381 static char *make_string(char **inp);
     526static const char *lookup_param(const char *src);
    382527static int handle_dollar(o_string *dest, struct p_context *ctx, struct in_str *input);
    383 static int parse_string(o_string *dest, struct p_context *ctx, const char *src);
    384 static int parse_stream(o_string *dest, struct p_context *ctx, struct in_str *input0, int end_trigger);
     528static int parse_stream(o_string *dest, struct p_context *ctx, struct in_str *input0, const char *end_trigger);
    385529/*   setup: */
    386 static int parse_stream_outer(struct in_str *inp, int flag);
    387 static int parse_string_outer(const char *s, int flag);
    388 static int parse_file_outer(FILE *f);
     530static int parse_and_run_stream(struct in_str *inp, int parse_flag);
     531static int parse_and_run_string(const char *s, int parse_flag);
     532static int parse_and_run_file(FILE *f);
    389533/*   job management: */
    390534static int checkjobs(struct pipe* fg_pipe);
     535#if ENABLE_HUSH_JOB
     536static int checkjobs_and_fg_shell(struct pipe* fg_pipe);
    391537static void insert_bg_job(struct pipe *pi);
    392538static void remove_bg_job(struct pipe *pi);
     539static void delete_finished_bg_job(struct pipe *pi);
     540#else
     541int checkjobs_and_fg_shell(struct pipe* fg_pipe); /* never called */
     542#endif
    393543/*     local variable support */
    394 static char **make_list_in(char **inp, char *name);
    395 static char *insert_var_value(char *inp);
    396 static char *get_local_var(const char *var);
    397 static void  unset_local_var(const char *name);
    398 static int set_local_var(const char *s, int flg_export);
     544static char **expand_strvec_to_strvec(char **argv);
     545/* used for eval */
     546static char *expand_strvec_to_string(char **argv);
     547/* used for expansion of right hand of assignments */
     548static char *expand_string_to_string(const char *str);
     549static struct variable *get_local_var(const char *name);
     550static int set_local_var(char *str, int flg_export);
     551static void unset_local_var(const char *name);
    399552
    400553/* Table of built-in functions.  They can be forked or not, depending on
    401554 * context: within pipes, they fork.  As simple commands, they do not.
    402555 * When used in non-forking context, they can change global variables
    403  * in the parent shell process.  If forked, of course they can not.
     556 * in the parent shell process.  If forked, of course they cannot.
    404557 * For example, 'unset foo | whatever' will parse and run, but foo will
    405558 * still be set at the end. */
     559struct built_in_command {
     560    const char *cmd;                /* name */
     561    int (*function) (char **argv);  /* function ptr */
     562#if ENABLE_HUSH_HELP
     563    const char *descr;              /* description */
     564#define BLTIN(cmd, func, help) { cmd, func, help }
     565#else
     566#define BLTIN(cmd, func, help) { cmd, func }
     567#endif
     568};
     569
    406570static const struct built_in_command bltins[] = {
    407     {"bg", "Resume a job in the background", builtin_fg_bg},
    408     {"break", "Exit for, while or until loop", builtin_not_written},
    409     {"cd", "Change working directory", builtin_cd},
    410     {"continue", "Continue for, while or until loop", builtin_not_written},
    411     {"env", "Print all environment variables", builtin_env},
    412     {"eval", "Construct and run shell command", builtin_eval},
    413     {"exec", "Exec command, replacing this shell with the exec'd process",
    414         builtin_exec},
    415     {"exit", "Exit from shell()", builtin_exit},
    416     {"export", "Set environment variable", builtin_export},
    417     {"fg", "Bring job into the foreground", builtin_fg_bg},
    418     {"jobs", "Lists the active jobs", builtin_jobs},
    419     {"pwd", "Print current directory", builtin_pwd},
    420     {"read", "Input environment variable", builtin_read},
    421     {"return", "Return from a function", builtin_not_written},
    422     {"set", "Set/unset shell local variables", builtin_set},
    423     {"shift", "Shift positional parameters", builtin_shift},
    424     {"trap", "Trap signals", builtin_not_written},
    425     {"ulimit","Controls resource limits", builtin_not_written},
    426     {"umask","Sets file creation mask", builtin_umask},
    427     {"unset", "Unset environment variable", builtin_unset},
    428     {".", "Source-in and run commands in a file", builtin_source},
    429     {"help", "List shell built-in commands", builtin_help},
    430     {NULL, NULL, NULL}
     571#if ENABLE_HUSH_JOB
     572    BLTIN("bg"    , builtin_fg_bg, "Resume a job in the background"),
     573#endif
     574//  BLTIN("break" , builtin_not_written, "Exit for, while or until loop"),
     575    BLTIN("cd"    , builtin_cd, "Change working directory"),
     576//  BLTIN("continue", builtin_not_written, "Continue for, while or until loop"),
     577    BLTIN("eval"  , builtin_eval, "Construct and run shell command"),
     578    BLTIN("exec"  , builtin_exec, "Exec command, replacing this shell with the exec'd process"),
     579    BLTIN("exit"  , builtin_exit, "Exit from shell"),
     580    BLTIN("export", builtin_export, "Set environment variable"),
     581#if ENABLE_HUSH_JOB
     582    BLTIN("fg"    , builtin_fg_bg, "Bring job into the foreground"),
     583    BLTIN("jobs"  , builtin_jobs, "Lists the active jobs"),
     584#endif
     585// TODO: remove pwd? we have it as an applet...
     586    BLTIN("pwd"   , builtin_pwd, "Print current directory"),
     587    BLTIN("read"  , builtin_read, "Input environment variable"),
     588//  BLTIN("return", builtin_not_written, "Return from a function"),
     589    BLTIN("set"   , builtin_set, "Set/unset shell local variables"),
     590    BLTIN("shift" , builtin_shift, "Shift positional parameters"),
     591//  BLTIN("trap"  , builtin_not_written, "Trap signals"),
     592//  BLTIN("ulimit", builtin_not_written, "Controls resource limits"),
     593    BLTIN("umask" , builtin_umask, "Sets file creation mask"),
     594    BLTIN("unset" , builtin_unset, "Unset environment variable"),
     595    BLTIN("."     , builtin_source, "Source-in and run commands in a file"),
     596#if ENABLE_HUSH_HELP
     597    BLTIN("help"  , builtin_help, "List shell built-in commands"),
     598#endif
     599    BLTIN(NULL, NULL, NULL)
    431600};
    432601
     602#if ENABLE_HUSH_JOB
     603
     604/* move to libbb? */
     605static void signal_SA_RESTART(int sig, void (*handler)(int))
     606{
     607    struct sigaction sa;
     608    sa.sa_handler = handler;
     609    sa.sa_flags = SA_RESTART;
     610    sigemptyset(&sa.sa_mask);
     611    sigaction(sig, &sa, NULL);
     612}
     613
     614/* Signals are grouped, we handle them in batches */
     615static void set_fatal_sighandler(void (*handler)(int))
     616{
     617    signal(SIGILL , handler);
     618    signal(SIGTRAP, handler);
     619    signal(SIGABRT, handler);
     620    signal(SIGFPE , handler);
     621    signal(SIGBUS , handler);
     622    signal(SIGSEGV, handler);
     623    /* bash 3.2 seems to handle these just like 'fatal' ones */
     624    signal(SIGHUP , handler);
     625    signal(SIGPIPE, handler);
     626    signal(SIGALRM, handler);
     627}
     628static void set_jobctrl_sighandler(void (*handler)(int))
     629{
     630    signal(SIGTSTP, handler);
     631    signal(SIGTTIN, handler);
     632    signal(SIGTTOU, handler);
     633}
     634static void set_misc_sighandler(void (*handler)(int))
     635{
     636    signal(SIGINT , handler);
     637    signal(SIGQUIT, handler);
     638    signal(SIGTERM, handler);
     639}
     640/* SIGCHLD is special and handled separately */
     641
     642static void set_every_sighandler(void (*handler)(int))
     643{
     644    set_fatal_sighandler(handler);
     645    set_jobctrl_sighandler(handler);
     646    set_misc_sighandler(handler);
     647    signal(SIGCHLD, handler);
     648}
     649
     650static void handler_ctrl_c(int sig)
     651{
     652    debug_printf_jobs("got sig %d\n", sig);
     653// as usual we can have all kinds of nasty problems with leaked malloc data here
     654    siglongjmp(toplevel_jb, 1);
     655}
     656
     657static void handler_ctrl_z(int sig)
     658{
     659    pid_t pid;
     660
     661    debug_printf_jobs("got tty sig %d in pid %d\n", sig, getpid());
     662    pid = fork();
     663    if (pid < 0) /* can't fork. Pretend there was no ctrl-Z */
     664        return;
     665    ctrl_z_flag = 1;
     666    if (!pid) { /* child */
     667        setpgrp();
     668        debug_printf_jobs("set pgrp for child %d ok\n", getpid());
     669        set_every_sighandler(SIG_DFL);
     670        raise(SIGTSTP); /* resend TSTP so that child will be stopped */
     671        debug_printf_jobs("returning in child\n");
     672        /* return to nofork, it will eventually exit now,
     673         * not return back to shell */
     674        return;
     675    }
     676    /* parent */
     677    /* finish filling up pipe info */
     678    toplevel_list->pgrp = pid; /* child is in its own pgrp */
     679    toplevel_list->progs[0].pid = pid;
     680    /* parent needs to longjmp out of running nofork.
     681     * we will "return" exitcode 0, with child put in background */
     682// as usual we can have all kinds of nasty problems with leaked malloc data here
     683    debug_printf_jobs("siglongjmp in parent\n");
     684    siglongjmp(toplevel_jb, 1);
     685}
     686
     687/* Restores tty foreground process group, and exits.
     688 * May be called as signal handler for fatal signal
     689 * (will faithfully resend signal to itself, producing correct exit state)
     690 * or called directly with -EXITCODE.
     691 * We also call it if xfunc is exiting. */
     692static void sigexit(int sig) ATTRIBUTE_NORETURN;
     693static void sigexit(int sig)
     694{
     695    sigset_t block_all;
     696
     697    /* Disable all signals: job control, SIGPIPE, etc. */
     698    sigfillset(&block_all);
     699    sigprocmask(SIG_SETMASK, &block_all, NULL);
     700
     701    if (interactive_fd)
     702        tcsetpgrp(interactive_fd, saved_tty_pgrp);
     703
     704    /* Not a signal, just exit */
     705    if (sig <= 0)
     706        _exit(- sig);
     707
     708    /* Enable only this sig and kill ourself with it */
     709    signal(sig, SIG_DFL);
     710    sigdelset(&block_all, sig);
     711    sigprocmask(SIG_SETMASK, &block_all, NULL);
     712    raise(sig);
     713    _exit(1); /* Should not reach it */
     714}
     715
     716/* Restores tty foreground process group, and exits. */
     717static void hush_exit(int exitcode) ATTRIBUTE_NORETURN;
     718static void hush_exit(int exitcode)
     719{
     720    fflush(NULL); /* flush all streams */
     721    sigexit(- (exitcode & 0xff));
     722}
     723
     724#else /* !JOB */
     725
     726#define set_fatal_sighandler(handler)   ((void)0)
     727#define set_jobctrl_sighandler(handler) ((void)0)
     728#define set_misc_sighandler(handler)    ((void)0)
     729#define hush_exit(e)                    exit(e)
     730
     731#endif /* JOB */
     732
     733
    433734static const char *set_cwd(void)
    434735{
    435     if(cwd==bb_msg_unknown)
    436         cwd = NULL;     /* xgetcwd(arg) called free(arg) */
    437     cwd = xgetcwd((char *)cwd);
     736    if (cwd == bb_msg_unknown)
     737        cwd = NULL;     /* xrealloc_getcwd_or_warn(arg) calls free(arg)! */
     738    cwd = xrealloc_getcwd_or_warn((char *)cwd);
    438739    if (!cwd)
    439740        cwd = bb_msg_unknown;
     
    442743
    443744/* built-in 'eval' handler */
    444 static int builtin_eval(struct child_prog *child)
    445 {
    446     char *str = NULL;
     745static int builtin_eval(char **argv)
     746{
    447747    int rcode = EXIT_SUCCESS;
    448748
    449     if (child->argv[1]) {
    450         str = make_string(child->argv + 1);
    451         parse_string_outer(str, FLAG_EXIT_FROM_LOOP |
    452                     FLAG_PARSE_SEMICOLON);
     749    if (argv[1]) {
     750        char *str = expand_strvec_to_string(argv + 1);
     751        parse_and_run_string(str, PARSEFLAG_EXIT_FROM_LOOP |
     752                    PARSEFLAG_SEMICOLON);
    453753        free(str);
    454754        rcode = last_return_code;
     
    458758
    459759/* built-in 'cd <path>' handler */
    460 static int builtin_cd(struct child_prog *child)
    461 {
    462     char *newdir;
    463     if (child->argv[1] == NULL)
    464         newdir = getenv("HOME");
     760static int builtin_cd(char **argv)
     761{
     762    const char *newdir;
     763    if (argv[1] == NULL)
     764        newdir = getenv("HOME") ? : "/";
    465765    else
    466         newdir = child->argv[1];
     766        newdir = argv[1];
    467767    if (chdir(newdir)) {
    468768        printf("cd: %s: %s\n", newdir, strerror(errno));
     
    473773}
    474774
    475 /* built-in 'env' handler */
    476 static int builtin_env(struct child_prog *dummy ATTRIBUTE_UNUSED)
    477 {
    478     char **e = environ;
    479     if (e == NULL) return EXIT_FAILURE;
    480     for (; *e; e++) {
    481         puts(*e);
    482     }
     775/* built-in 'exec' handler */
     776static int builtin_exec(char **argv)
     777{
     778    if (argv[1] == NULL)
     779        return EXIT_SUCCESS;   /* Really? */
     780    pseudo_exec_argv(argv + 1);
     781    /* never returns */
     782}
     783
     784/* built-in 'exit' handler */
     785static int builtin_exit(char **argv)
     786{
     787// TODO: bash does it ONLY on top-level sh exit (+interacive only?)
     788    //puts("exit"); /* bash does it */
     789// TODO: warn if we have background jobs: "There are stopped jobs"
     790// On second consecutive 'exit', exit anyway.
     791
     792    if (argv[1] == NULL)
     793        hush_exit(last_return_code);
     794    /* mimic bash: exit 123abc == exit 255 + error msg */
     795    xfunc_error_retval = 255;
     796    /* bash: exit -2 == exit 254, no error msg */
     797    hush_exit(xatoi(argv[1]) & 0xff);
     798}
     799
     800/* built-in 'export VAR=value' handler */
     801static int builtin_export(char **argv)
     802{
     803    const char *value;
     804    char *name = argv[1];
     805
     806    if (name == NULL) {
     807        // TODO:
     808        // ash emits: export VAR='VAL'
     809        // bash: declare -x VAR="VAL"
     810        // (both also escape as needed (quotes, $, etc))
     811        char **e = environ;
     812        if (e)
     813            while (*e)
     814                puts(*e++);
     815        return EXIT_SUCCESS;
     816    }
     817
     818    value = strchr(name, '=');
     819    if (!value) {
     820        /* They are exporting something without a =VALUE */
     821        struct variable *var;
     822
     823        var = get_local_var(name);
     824        if (var) {
     825            var->flg_export = 1;
     826            putenv(var->varstr);
     827        }
     828        /* bash does not return an error when trying to export
     829         * an undefined variable.  Do likewise. */
     830        return EXIT_SUCCESS;
     831    }
     832
     833    set_local_var(xstrdup(name), 1);
    483834    return EXIT_SUCCESS;
    484835}
    485836
    486 /* built-in 'exec' handler */
    487 static int builtin_exec(struct child_prog *child)
    488 {
    489     if (child->argv[1] == NULL)
    490         return EXIT_SUCCESS;   /* Really? */
    491     child->argv++;
    492     pseudo_exec(child);
    493     /* never returns */
    494 }
    495 
    496 /* built-in 'exit' handler */
    497 static int builtin_exit(struct child_prog *child)
    498 {
    499     if (child->argv[1] == NULL)
    500         exit(last_return_code);
    501     exit (atoi(child->argv[1]));
    502 }
    503 
    504 /* built-in 'export VAR=value' handler */
    505 static int builtin_export(struct child_prog *child)
    506 {
    507     int res = 0;
    508     char *name = child->argv[1];
    509 
    510     if (name == NULL) {
    511         return (builtin_env(child));
    512     }
    513 
    514     name = strdup(name);
    515 
    516     if(name) {
    517         char *value = strchr(name, '=');
    518 
    519         if (!value) {
    520             char *tmp;
    521             /* They are exporting something without an =VALUE */
    522 
    523             value = get_local_var(name);
    524             if (value) {
    525                 size_t ln = strlen(name);
    526 
    527                 tmp = realloc(name, ln+strlen(value)+2);
    528                 if(tmp==NULL)
    529                     res = -1;
    530                 else {
    531                     sprintf(tmp+ln, "=%s", value);
    532                     name = tmp;
    533                 }
    534             } else {
    535                 /* bash does not return an error when trying to export
    536                  * an undefined variable.  Do likewise. */
    537                 res = 1;
    538             }
    539         }
    540     }
    541     if (res<0)
    542         bb_perror_msg("export");
    543     else if(res==0)
    544         res = set_local_var(name, 1);
    545     else
    546         res = 0;
    547     free(name);
    548     return res;
    549 }
    550 
     837#if ENABLE_HUSH_JOB
    551838/* built-in 'fg' and 'bg' handler */
    552 static int builtin_fg_bg(struct child_prog *child)
     839static int builtin_fg_bg(char **argv)
    553840{
    554841    int i, jobnum;
    555     struct pipe *pi=NULL;
    556 
    557     if (!interactive)
     842    struct pipe *pi;
     843
     844    if (!interactive_fd)
    558845        return EXIT_FAILURE;
    559846    /* If they gave us no args, assume they want the last backgrounded task */
    560     if (!child->argv[1]) {
     847    if (!argv[1]) {
    561848        for (pi = job_list; pi; pi = pi->next) {
    562849            if (pi->jobid == last_jobid) {
    563                 break;
    564             }
    565         }
    566         if (!pi) {
    567             bb_error_msg("%s: no current job", child->argv[0]);
    568             return EXIT_FAILURE;
    569         }
    570     } else {
    571         if (sscanf(child->argv[1], "%%%d", &jobnum) != 1) {
    572             bb_error_msg("%s: bad argument '%s'", child->argv[0], child->argv[1]);
    573             return EXIT_FAILURE;
    574         }
    575         for (pi = job_list; pi; pi = pi->next) {
    576             if (pi->jobid == jobnum) {
    577                 break;
    578             }
    579         }
    580         if (!pi) {
    581             bb_error_msg("%s: %d: no such job", child->argv[0], jobnum);
    582             return EXIT_FAILURE;
    583         }
    584     }
    585 
    586     if (*child->argv[0] == 'f') {
     850                goto found;
     851            }
     852        }
     853        bb_error_msg("%s: no current job", argv[0]);
     854        return EXIT_FAILURE;
     855    }
     856    if (sscanf(argv[1], "%%%d", &jobnum) != 1) {
     857        bb_error_msg("%s: bad argument '%s'", argv[0], argv[1]);
     858        return EXIT_FAILURE;
     859    }
     860    for (pi = job_list; pi; pi = pi->next) {
     861        if (pi->jobid == jobnum) {
     862            goto found;
     863        }
     864    }
     865    bb_error_msg("%s: %d: no such job", argv[0], jobnum);
     866    return EXIT_FAILURE;
     867 found:
     868    // TODO: bash prints a string representation
     869    // of job being foregrounded (like "sleep 1 | cat")
     870    if (*argv[0] == 'f') {
    587871        /* Put the job into the foreground.  */
    588         tcsetpgrp(shell_terminal, pi->pgrp);
     872        tcsetpgrp(interactive_fd, pi->pgrp);
    589873    }
    590874
    591875    /* Restart the processes in the job */
    592     for (i = 0; i < pi->num_progs; i++)
     876    debug_printf_jobs("reviving %d procs, pgrp %d\n", pi->num_progs, pi->pgrp);
     877    for (i = 0; i < pi->num_progs; i++) {
     878        debug_printf_jobs("reviving pid %d\n", pi->progs[i].pid);
    593879        pi->progs[i].is_stopped = 0;
    594 
    595     if ( (i=kill(- pi->pgrp, SIGCONT)) < 0) {
    596         if (i == ESRCH) {
    597             remove_bg_job(pi);
     880    }
     881    pi->stopped_progs = 0;
     882
     883    i = kill(- pi->pgrp, SIGCONT);
     884    if (i < 0) {
     885        if (errno == ESRCH) {
     886            delete_finished_bg_job(pi);
     887            return EXIT_SUCCESS;
    598888        } else {
    599889            bb_perror_msg("kill (SIGCONT)");
     
    601891    }
    602892
    603     pi->stopped_progs = 0;
     893    if (*argv[0] == 'f') {
     894        remove_bg_job(pi);
     895        return checkjobs_and_fg_shell(pi);
     896    }
    604897    return EXIT_SUCCESS;
    605898}
     899#endif
    606900
    607901/* built-in 'help' handler */
    608 static int builtin_help(struct child_prog *dummy ATTRIBUTE_UNUSED)
     902#if ENABLE_HUSH_HELP
     903static int builtin_help(char **argv ATTRIBUTE_UNUSED)
    609904{
    610905    const struct built_in_command *x;
     
    613908    printf("-------------------\n");
    614909    for (x = bltins; x->cmd; x++) {
    615         if (x->descr==NULL)
    616             continue;
    617910        printf("%s\t%s\n", x->cmd, x->descr);
    618911    }
     
    620913    return EXIT_SUCCESS;
    621914}
    622 
     915#endif
     916
     917#if ENABLE_HUSH_JOB
    623918/* built-in 'jobs' handler */
    624 static int builtin_jobs(struct child_prog *child ATTRIBUTE_UNUSED)
     919static int builtin_jobs(char **argv ATTRIBUTE_UNUSED)
    625920{
    626921    struct pipe *job;
    627     char *status_string;
     922    const char *status_string;
    628923
    629924    for (job = job_list; job; job = job->next) {
     
    633928            status_string = "Running";
    634929
    635         printf(JOB_STATUS_FORMAT, job->jobid, status_string, job->text);
     930        printf(JOB_STATUS_FORMAT, job->jobid, status_string, job->cmdtext);
    636931    }
    637932    return EXIT_SUCCESS;
    638933}
    639 
     934#endif
    640935
    641936/* built-in 'pwd' handler */
    642 static int builtin_pwd(struct child_prog *dummy ATTRIBUTE_UNUSED)
     937static int builtin_pwd(char **argv ATTRIBUTE_UNUSED)
    643938{
    644939    puts(set_cwd());
     
    647942
    648943/* built-in 'read VAR' handler */
    649 static int builtin_read(struct child_prog *child)
    650 {
    651     int res;
    652 
    653     if (child->argv[1]) {
    654         char string[BUFSIZ];
    655         char *var = 0;
    656 
    657         string[0] = 0;  /* In case stdin has only EOF */
    658         /* read string */
    659         fgets(string, sizeof(string), stdin);
    660         chomp(string);
    661         var = malloc(strlen(child->argv[1])+strlen(string)+2);
    662         if(var) {
    663             sprintf(var, "%s=%s", child->argv[1], string);
    664             res = set_local_var(var, 0);
    665         } else
    666             res = -1;
    667         if (res)
    668             bb_perror_msg("read");
    669         free(var);      /* So not move up to avoid breaking errno */
    670         return res;
    671     } else {
    672         do res=getchar(); while(res!='\n' && res!=EOF);
    673         return 0;
    674     }
    675 }
    676 
    677 /* built-in 'set VAR=value' handler */
    678 static int builtin_set(struct child_prog *child)
    679 {
    680     char *temp = child->argv[1];
    681     struct variables *e;
     944static int builtin_read(char **argv)
     945{
     946    char *string;
     947    const char *name = argv[1] ? argv[1] : "REPLY";
     948
     949    string = xmalloc_reads(STDIN_FILENO, xasprintf("%s=", name));
     950    return set_local_var(string, 0);
     951}
     952
     953/* built-in 'set [VAR=value]' handler */
     954static int builtin_set(char **argv)
     955{
     956    char *temp = argv[1];
     957    struct variable *e;
    682958
    683959    if (temp == NULL)
    684         for(e = top_vars; e; e=e->next)
    685             printf("%s=%s\n", e->name, e->value);
     960        for (e = top_var; e; e = e->next)
     961            puts(e->varstr);
    686962    else
    687         set_local_var(temp, 0);
    688 
    689         return EXIT_SUCCESS;
     963        set_local_var(xstrdup(temp), 0);
     964
     965    return EXIT_SUCCESS;
    690966}
    691967
    692968
    693969/* Built-in 'shift' handler */
    694 static int builtin_shift(struct child_prog *child)
    695 {
    696     int n=1;
    697     if (child->argv[1]) {
    698         n=atoi(child->argv[1]);
    699     }
    700     if (n>=0 && n<global_argc) {
    701         /* XXX This probably breaks $0 */
     970static int builtin_shift(char **argv)
     971{
     972    int n = 1;
     973    if (argv[1]) {
     974        n = atoi(argv[1]);
     975    }
     976    if (n >= 0 && n < global_argc) {
     977        global_argv[n] = global_argv[0];
    702978        global_argc -= n;
    703979        global_argv += n;
    704980        return EXIT_SUCCESS;
    705     } else {
    706         return EXIT_FAILURE;
    707     }
     981    }
     982    return EXIT_FAILURE;
    708983}
    709984
    710985/* Built-in '.' handler (read-in and execute commands from file) */
    711 static int builtin_source(struct child_prog *child)
     986static int builtin_source(char **argv)
    712987{
    713988    FILE *input;
    714989    int status;
    715990
    716     if (child->argv[1] == NULL)
     991    if (argv[1] == NULL)
    717992        return EXIT_FAILURE;
    718993
    719994    /* XXX search through $PATH is missing */
    720     input = fopen(child->argv[1], "r");
     995    input = fopen(argv[1], "r");
    721996    if (!input) {
    722         bb_error_msg("Couldn't open file '%s'", child->argv[1]);
     997        bb_error_msg("cannot open '%s'", argv[1]);
    723998        return EXIT_FAILURE;
    724999    }
     
    7271002    /* XXX argv and argc are broken; need to save old global_argv
    7281003     * (pointer only is OK!) on this stack frame,
    729      * set global_argv=child->argv+1, recurse, and restore. */
     1004     * set global_argv=argv+1, recurse, and restore. */
    7301005    mark_open(fileno(input));
    731     status = parse_file_outer(input);
     1006    status = parse_and_run_file(input);
    7321007    mark_closed(fileno(input));
    7331008    fclose(input);
    734     return (status);
    735 }
    736 
    737 static int builtin_umask(struct child_prog *child)
     1009    return status;
     1010}
     1011
     1012static int builtin_umask(char **argv)
    7381013{
    7391014    mode_t new_umask;
    740     const char *arg = child->argv[1];
     1015    const char *arg = argv[1];
    7411016    char *end;
    7421017    if (arg) {
    743         new_umask=strtoul(arg, &end, 8);
    744         if (*end!='\0' || end == arg) {
     1018        new_umask = strtoul(arg, &end, 8);
     1019        if (*end != '\0' || end == arg) {
    7451020            return EXIT_FAILURE;
    7461021        }
    7471022    } else {
    748         printf("%.3o\n", (unsigned int) (new_umask=umask(0)));
     1023        new_umask = umask(0);
     1024        printf("%.3o\n", (unsigned) new_umask);
    7491025    }
    7501026    umask(new_umask);
     
    7531029
    7541030/* built-in 'unset VAR' handler */
    755 static int builtin_unset(struct child_prog *child)
    756 {
    757     /* bash returned already true */
    758     unset_local_var(child->argv[1]);
     1031static int builtin_unset(char **argv)
     1032{
     1033    /* bash always returns true */
     1034    unset_local_var(argv[1]);
    7591035    return EXIT_SUCCESS;
    7601036}
    7611037
    762 static int builtin_not_written(struct child_prog *child)
    763 {
    764     printf("builtin_%s not written\n",child->argv[0]);
    765     return EXIT_FAILURE;
    766 }
     1038//static int builtin_not_written(char **argv)
     1039//{
     1040//  printf("builtin_%s not written\n", argv[0]);
     1041//  return EXIT_FAILURE;
     1042//}
    7671043
    7681044static int b_check_space(o_string *o, int len)
     
    7711047     * in here, such as setting a maximum string length */
    7721048    if (o->length + len > o->maxlen) {
    773         char *old_data = o->data;
    774         /* assert (data == NULL || o->maxlen != 0); */
    775         o->maxlen += max(2*len, B_CHUNK);
    776         o->data = realloc(o->data, 1 + o->maxlen);
    777         if (o->data == NULL) {
    778             free(old_data);
    779         }
     1049        /* assert(data == NULL || o->maxlen != 0); */
     1050        o->maxlen += (2*len > B_CHUNK ? 2*len : B_CHUNK);
     1051        o->data = xrealloc(o->data, 1 + o->maxlen);
    7801052    }
    7811053    return o->data == NULL;
     
    7841056static int b_addchr(o_string *o, int ch)
    7851057{
    786     debug_printf("b_addchr: %c %d %p\n", ch, o->length, o);
    787     if (b_check_space(o, 1)) return B_NOSPAC;
     1058    debug_printf("b_addchr: '%c' o->length=%d o=%p\n", ch, o->length, o);
     1059    if (b_check_space(o, 1))
     1060        return B_NOSPAC;
    7881061    o->data[o->length] = ch;
    7891062    o->length++;
     
    7961069    o->length = 0;
    7971070    o->nonnull = 0;
    798     if (o->data != NULL) *o->data = '\0';
     1071    if (o->data != NULL)
     1072        *o->data = '\0';
    7991073}
    8001074
     
    8121086static int b_addqchr(o_string *o, int ch, int quote)
    8131087{
    814     if (quote && strchr("*?[\\",ch)) {
     1088    if (quote && strchr("*?[\\", ch)) {
    8151089        int rc;
    8161090        rc = b_addchr(o, '\\');
    817         if (rc) return rc;
     1091        if (rc)
     1092            return rc;
    8181093    }
    8191094    return b_addchr(o, ch);
    8201095}
    8211096
    822 /* belongs in utility.c */
    823 static char *simple_itoa(unsigned int i)
    824 {
    825     /* 21 digits plus null terminator, good for 64-bit or smaller ints */
    826     static char local[22];
    827     char *p = &local[21];
    828     *p-- = '\0';
    829     do {
    830         *p-- = '0' + i % 10;
    831         i /= 10;
    832     } while (i > 0);
    833     return p + 1;
    834 }
    835 
    836 static int b_adduint(o_string *o, unsigned int i)
    837 {
    838     int r;
    839     char *p = simple_itoa(i);
    840     /* no escape checking necessary */
    841     do r=b_addchr(o, *p++); while (r==0 && *p);
    842     return r;
    843 }
    844 
    8451097static int static_get(struct in_str *i)
    8461098{
    847     int ch=*i->p++;
    848     if (ch=='\0') return EOF;
     1099    int ch = *i->p++;
     1100    if (ch == '\0') return EOF;
    8491101    return ch;
    8501102}
     
    8551107}
    8561108
    857 static inline void cmdedit_set_initial_prompt(void)
    858 {
    859 #ifndef CONFIG_FEATURE_SH_FANCY_PROMPT
     1109#if ENABLE_HUSH_INTERACTIVE
     1110#if ENABLE_FEATURE_EDITING
     1111static void cmdedit_set_initial_prompt(void)
     1112{
     1113#if !ENABLE_FEATURE_EDITING_FANCY_PROMPT
    8601114    PS1 = NULL;
    8611115#else
    8621116    PS1 = getenv("PS1");
    863     if(PS1==0)
     1117    if (PS1 == NULL)
    8641118        PS1 = "\\w \\$ ";
    8651119#endif
    8661120}
    867 
    868 static inline void setup_prompt_string(int promptmode, char **prompt_str)
    869 {
    870     debug_printf("setup_prompt_string %d ",promptmode);
    871 #ifndef CONFIG_FEATURE_SH_FANCY_PROMPT
     1121#endif /* EDITING */
     1122
     1123static const char* setup_prompt_string(int promptmode)
     1124{
     1125    const char *prompt_str;
     1126    debug_printf("setup_prompt_string %d ", promptmode);
     1127#if !ENABLE_FEATURE_EDITING_FANCY_PROMPT
    8721128    /* Set up the prompt */
    873     if (promptmode == 1) {
    874         free(PS1);
    875         PS1=xmalloc(strlen(cwd)+4);
    876         sprintf(PS1, "%s %s", cwd, ( geteuid() != 0 ) ?  "$ ":"# ");
    877         *prompt_str = PS1;
     1129    if (promptmode == 0) { /* PS1 */
     1130        free((char*)PS1);
     1131        PS1 = xasprintf("%s %c ", cwd, (geteuid() != 0) ? '$' : '#');
     1132        prompt_str = PS1;
    8781133    } else {
    879         *prompt_str = PS2;
     1134        prompt_str = PS2;
    8801135    }
    8811136#else
    882     *prompt_str = (promptmode==1)? PS1 : PS2;
    883 #endif
    884     debug_printf("result %s\n",*prompt_str);
     1137    prompt_str = (promptmode == 0) ? PS1 : PS2;
     1138#endif
     1139    debug_printf("result '%s'\n", prompt_str);
     1140    return prompt_str;
    8851141}
    8861142
    8871143static void get_user_input(struct in_str *i)
    8881144{
    889     char *prompt_str;
    890     static char the_command[BUFSIZ];
    891 
    892     setup_prompt_string(i->promptmode, &prompt_str);
    893 #ifdef CONFIG_FEATURE_COMMAND_EDITING
    894     /*
    895      ** enable command line editing only while a command line
    896      ** is actually being read; otherwise, we'll end up bequeathing
    897      ** atexit() handlers and other unwanted stuff to our
    898      ** child processes (rob@sysgo.de)
    899      */
    900     cmdedit_read_input(prompt_str, the_command);
     1145    int r;
     1146    const char *prompt_str;
     1147
     1148    prompt_str = setup_prompt_string(i->promptmode);
     1149#if ENABLE_FEATURE_EDITING
     1150    /* Enable command line editing only while a command line
     1151     * is actually being read; otherwise, we'll end up bequeathing
     1152     * atexit() handlers and other unwanted stuff to our
     1153     * child processes (rob@sysgo.de) */
     1154    r = read_line_input(prompt_str, user_input_buf, BUFSIZ-1, line_input_state);
     1155    i->eof_flag = (r < 0);
     1156    if (i->eof_flag) { /* EOF/error detected */
     1157        user_input_buf[0] = EOF; /* yes, it will be truncated, it's ok */
     1158        user_input_buf[1] = '\0';
     1159    }
    9011160#else
    9021161    fputs(prompt_str, stdout);
    9031162    fflush(stdout);
    904     the_command[0]=fgetc(i->file);
    905     the_command[1]='\0';
    906 #endif
    907     fflush(stdout);
    908     i->p = the_command;
    909 }
     1163    user_input_buf[0] = r = fgetc(i->file);
     1164    /*user_input_buf[1] = '\0'; - already is and never changed */
     1165    i->eof_flag = (r == EOF);
     1166#endif
     1167    i->p = user_input_buf;
     1168}
     1169#endif  /* INTERACTIVE */
    9101170
    9111171/* This is the magic location that prints prompts
     
    9151175    int ch;
    9161176
    917     ch = 0;
    9181177    /* If there is data waiting, eat it up */
    9191178    if (i->p && *i->p) {
    920         ch=*i->p++;
     1179#if ENABLE_HUSH_INTERACTIVE
     1180 take_cached:
     1181#endif
     1182        ch = *i->p++;
     1183        if (i->eof_flag && !*i->p)
     1184            ch = EOF;
    9211185    } else {
    9221186        /* need to double check i->file because we might be doing something
    9231187         * more complicated by now, like sourcing or substituting. */
    924         if (i->__promptme && interactive && i->file == stdin) {
    925             while(! i->p || (interactive && strlen(i->p)==0) ) {
     1188#if ENABLE_HUSH_INTERACTIVE
     1189        if (interactive_fd && i->promptme && i->file == stdin) {
     1190            do {
    9261191                get_user_input(i);
    927             }
    928             i->promptmode=2;
    929             i->__promptme = 0;
    930             if (i->p && *i->p) {
    931                 ch=*i->p++;
    932             }
    933         } else {
    934             ch = fgetc(i->file);
    935         }
    936 
    937         debug_printf("b_getch: got a %d\n", ch);
    938     }
    939     if (ch == '\n') i->__promptme=1;
     1192            } while (!*i->p); /* need non-empty line */
     1193            i->promptmode = 1; /* PS2 */
     1194            i->promptme = 0;
     1195            goto take_cached;
     1196        }
     1197#endif
     1198        ch = fgetc(i->file);
     1199    }
     1200    debug_printf("file_get: got a '%c' %d\n", ch, ch);
     1201#if ENABLE_HUSH_INTERACTIVE
     1202    if (ch == '\n')
     1203        i->promptme = 1;
     1204#endif
    9401205    return ch;
    9411206}
     
    9461211static int file_peek(struct in_str *i)
    9471212{
     1213    int ch;
    9481214    if (i->p && *i->p) {
     1215        if (i->eof_flag && !i->p[1])
     1216            return EOF;
    9491217        return *i->p;
    950     } else {
    951         i->peek_buf[0] = fgetc(i->file);
    952         i->peek_buf[1] = '\0';
    953         i->p = i->peek_buf;
    954         debug_printf("b_peek: got a %d\n", *i->p);
    955         return *i->p;
    956     }
     1218    }
     1219    ch = fgetc(i->file);
     1220    i->eof_flag = (ch == EOF);
     1221    i->peek_buf[0] = ch;
     1222    i->peek_buf[1] = '\0';
     1223    i->p = i->peek_buf;
     1224    debug_printf("file_peek: got a '%c' %d\n", *i->p, *i->p);
     1225    return ch;
    9571226}
    9581227
     
    9611230    i->peek = file_peek;
    9621231    i->get = file_get;
    963     i->__promptme=1;
    964     i->promptmode=1;
     1232#if ENABLE_HUSH_INTERACTIVE
     1233    i->promptme = 1;
     1234    i->promptmode = 0; /* PS1 */
     1235#endif
    9651236    i->file = f;
    9661237    i->p = NULL;
     
    9711242    i->peek = static_peek;
    9721243    i->get = static_get;
    973     i->__promptme=1;
    974     i->promptmode=1;
     1244#if ENABLE_HUSH_INTERACTIVE
     1245    i->promptme = 1;
     1246    i->promptmode = 0; /* PS1 */
     1247#endif
    9751248    i->p = s;
     1249    i->eof_flag = 0;
    9761250}
    9771251
     
    9971271{
    9981272    struct close_me *c;
    999     for (c=close_me_head; c; c=c->next) {
     1273    for (c = close_me_head; c; c = c->next) {
    10001274        close(c->fd);
    10011275    }
     
    10101284    struct redir_struct *redir;
    10111285
    1012     for (redir=prog->redirects; redir; redir=redir->next) {
     1286    for (redir = prog->redirects; redir; redir = redir->next) {
    10131287        if (redir->dup == -1 && redir->word.gl_pathv == NULL) {
    10141288            /* something went wrong in the parse.  Pretend it didn't happen */
     
    10161290        }
    10171291        if (redir->dup == -1) {
    1018             mode=redir_table[redir->type].mode;
    1019             openfd = open(redir->word.gl_pathv[0], mode, 0666);
     1292            mode = redir_table[redir->type].mode;
     1293            openfd = open_or_warn(redir->word.gl_pathv[0], mode);
    10201294            if (openfd < 0) {
    10211295            /* this could get lost if stderr has been redirected, but
    10221296               bash and ash both lose it as well (though zsh doesn't!) */
    1023                 bb_perror_msg("error opening %s", redir->word.gl_pathv[0]);
    10241297                return 1;
    10251298            }
     
    10371310                dup2(openfd, redir->fd);
    10381311                if (redir->dup == -1)
    1039                     close (openfd);
     1312                    close(openfd);
    10401313            }
    10411314        }
     
    10471320{
    10481321    int i, fd;
    1049     for (i=0; i<3; i++) {
     1322    for (i = 0; i < 3; i++) {
    10501323        fd = squirrel[i];
    10511324        if (fd != -1) {
    1052             /* No error checking.  I sure wouldn't know what
    1053              * to do with an error if I found one! */
    1054             dup2(fd, i);
    1055             close(fd);
     1325            /* We simply die on error */
     1326            xmove_fd(fd, i);
    10561327        }
    10571328    }
     
    10611332/* XXX no exit() here.  If you don't exec, use _exit instead.
    10621333 * The at_exit handlers apparently confuse the calling process,
    1063  * in particular stdin handling.  Not sure why? */
    1064 static void pseudo_exec(struct child_prog *child)
     1334 * in particular stdin handling.  Not sure why? -- because of vfork! (vda) */
     1335static void pseudo_exec_argv(char **argv)
    10651336{
    10661337    int i, rcode;
    10671338    char *p;
    10681339    const struct built_in_command *x;
     1340
     1341    for (i = 0; is_assignment(argv[i]); i++) {
     1342        debug_printf_exec("pid %d environment modification: %s\n",
     1343                getpid(), argv[i]);
     1344// FIXME: vfork case??
     1345        p = expand_string_to_string(argv[i]);
     1346        putenv(p);
     1347    }
     1348    argv += i;
     1349    /* If a variable is assigned in a forest, and nobody listens,
     1350     * was it ever really set?
     1351     */
     1352    if (argv[0] == NULL) {
     1353        _exit(EXIT_SUCCESS);
     1354    }
     1355
     1356    argv = expand_strvec_to_strvec(argv);
     1357
     1358    /*
     1359     * Check if the command matches any of the builtins.
     1360     * Depending on context, this might be redundant.  But it's
     1361     * easier to waste a few CPU cycles than it is to figure out
     1362     * if this is one of those cases.
     1363     */
     1364    for (x = bltins; x->cmd; x++) {
     1365        if (strcmp(argv[0], x->cmd) == 0) {
     1366            debug_printf_exec("running builtin '%s'\n", argv[0]);
     1367            rcode = x->function(argv);
     1368            fflush(stdout);
     1369            _exit(rcode);
     1370        }
     1371    }
     1372
     1373    /* Check if the command matches any busybox applets */
     1374#if ENABLE_FEATURE_SH_STANDALONE
     1375    if (strchr(argv[0], '/') == NULL) {
     1376        const struct bb_applet *a = find_applet_by_name(argv[0]);
     1377        if (a) {
     1378            if (a->noexec) {
     1379                current_applet = a;
     1380                debug_printf_exec("running applet '%s'\n", argv[0]);
     1381// is it ok that run_current_applet_and_exit() does exit(), not _exit()?
     1382                run_current_applet_and_exit(argv);
     1383            }
     1384            /* re-exec ourselves with the new arguments */
     1385            debug_printf_exec("re-execing applet '%s'\n", argv[0]);
     1386            execvp(bb_busybox_exec_path, argv);
     1387            /* If they called chroot or otherwise made the binary no longer
     1388             * executable, fall through */
     1389        }
     1390    }
     1391#endif
     1392
     1393    debug_printf_exec("execing '%s'\n", argv[0]);
     1394    execvp(argv[0], argv);
     1395    bb_perror_msg("cannot exec '%s'", argv[0]);
     1396    _exit(1);
     1397}
     1398
     1399static void pseudo_exec(struct child_prog *child)
     1400{
     1401// FIXME: buggy wrt NOMMU! Must not modify any global data
     1402// until it does exec/_exit, but currently it does.
     1403    int rcode;
     1404
    10691405    if (child->argv) {
    1070         for (i=0; is_assignment(child->argv[i]); i++) {
    1071             debug_printf("pid %d environment modification: %s\n",getpid(),child->argv[i]);
    1072             p = insert_var_value(child->argv[i]);
    1073             putenv(strdup(p));
    1074             if (p != child->argv[i]) free(p);
    1075         }
    1076         child->argv+=i;  /* XXX this hack isn't so horrible, since we are about
    1077                                 to exit, and therefore don't need to keep data
    1078                                 structures consistent for free() use. */
    1079         /* If a variable is assigned in a forest, and nobody listens,
    1080          * was it ever really set?
    1081          */
    1082         if (child->argv[0] == NULL) {
    1083             _exit(EXIT_SUCCESS);
    1084         }
    1085 
    1086         /*
    1087          * Check if the command matches any of the builtins.
    1088          * Depending on context, this might be redundant.  But it's
    1089          * easier to waste a few CPU cycles than it is to figure out
    1090          * if this is one of those cases.
    1091          */
    1092         for (x = bltins; x->cmd; x++) {
    1093             if (strcmp(child->argv[0], x->cmd) == 0 ) {
    1094                 debug_printf("builtin exec %s\n", child->argv[0]);
    1095                 rcode = x->function(child);
    1096                 fflush(stdout);
    1097                 _exit(rcode);
    1098             }
    1099         }
    1100 
    1101         /* Check if the command matches any busybox internal commands
    1102          * ("applets") here.
    1103          * FIXME: This feature is not 100% safe, since
    1104          * BusyBox is not fully reentrant, so we have no guarantee the things
    1105          * from the .bss are still zeroed, or that things from .data are still
    1106          * at their defaults.  We could exec ourself from /proc/self/exe, but I
    1107          * really dislike relying on /proc for things.  We could exec ourself
    1108          * from global_argv[0], but if we are in a chroot, we may not be able
    1109          * to find ourself... */
    1110 #ifdef CONFIG_FEATURE_SH_STANDALONE_SHELL
    1111         {
    1112             int argc_l;
    1113             char** argv_l=child->argv;
    1114             char *name = child->argv[0];
    1115 
    1116             /* Count argc for use in a second... */
    1117             for(argc_l=0;*argv_l!=NULL; argv_l++, argc_l++);
    1118             optind = 1;
    1119             debug_printf("running applet %s\n", name);
    1120             run_applet_by_name(name, argc_l, child->argv);
    1121         }
    1122 #endif
    1123         debug_printf("exec of %s\n",child->argv[0]);
    1124         execvp(child->argv[0],child->argv);
    1125         bb_perror_msg("couldn't exec: %s",child->argv[0]);
    1126         _exit(1);
    1127     } else if (child->group) {
    1128         debug_printf("runtime nesting to group\n");
    1129         interactive=0;    /* crucial!!!! */
     1406        pseudo_exec_argv(child->argv);
     1407    }
     1408
     1409    if (child->group) {
     1410    // FIXME: do not modify globals! Think vfork!
     1411#if ENABLE_HUSH_INTERACTIVE
     1412        debug_printf_exec("pseudo_exec: setting interactive_fd=0\n");
     1413        interactive_fd = 0;    /* crucial!!!! */
     1414#endif
     1415        debug_printf_exec("pseudo_exec: run_list_real\n");
    11301416        rcode = run_list_real(child->group);
    11311417        /* OK to leak memory by not calling free_pipe_list,
    11321418         * since this process is about to exit */
    11331419        _exit(rcode);
    1134     } else {
    1135         /* Can happen.  See what bash does with ">foo" by itself. */
    1136         debug_printf("trying to pseudo_exec null command\n");
    1137         _exit(EXIT_SUCCESS);
    1138     }
     1420    }
     1421
     1422    /* Can happen.  See what bash does with ">foo" by itself. */
     1423    debug_printf("trying to pseudo_exec null command\n");
     1424    _exit(EXIT_SUCCESS);
     1425}
     1426
     1427#if ENABLE_HUSH_JOB
     1428static const char *get_cmdtext(struct pipe *pi)
     1429{
     1430    char **argv;
     1431    char *p;
     1432    int len;
     1433
     1434    /* This is subtle. ->cmdtext is created only on first backgrounding.
     1435     * (Think "cat, <ctrl-z>, fg, <ctrl-z>, fg, <ctrl-z>...." here...)
     1436     * On subsequent bg argv is trashed, but we won't use it */
     1437    if (pi->cmdtext)
     1438        return pi->cmdtext;
     1439    argv = pi->progs[0].argv;
     1440    if (!argv || !argv[0])
     1441        return (pi->cmdtext = xzalloc(1));
     1442
     1443    len = 0;
     1444    do len += strlen(*argv) + 1; while (*++argv);
     1445    pi->cmdtext = p = xmalloc(len);
     1446    argv = pi->progs[0].argv;
     1447    do {
     1448        len = strlen(*argv);
     1449        memcpy(p, *argv, len);
     1450        p += len;
     1451        *p++ = ' ';
     1452    } while (*++argv);
     1453    p[-1] = '\0';
     1454    return pi->cmdtext;
    11391455}
    11401456
     
    11421458{
    11431459    struct pipe *thejob;
     1460    int i;
    11441461
    11451462    /* Linear search for the ID of the job to use */
     
    11491466            pi->jobid = thejob->jobid + 1;
    11501467
    1151     /* add thejob to the list of running jobs */
     1468    /* Add thejob to the list of running jobs */
    11521469    if (!job_list) {
    11531470        thejob = job_list = xmalloc(sizeof(*thejob));
    11541471    } else {
    1155         for (thejob = job_list; thejob->next; thejob = thejob->next) /* nothing */;
     1472        for (thejob = job_list; thejob->next; thejob = thejob->next)
     1473            continue;
    11561474        thejob->next = xmalloc(sizeof(*thejob));
    11571475        thejob = thejob->next;
    11581476    }
    11591477
    1160     /* physically copy the struct job */
     1478    /* Physically copy the struct job */
    11611479    memcpy(thejob, pi, sizeof(struct pipe));
     1480    thejob->progs = xzalloc(sizeof(pi->progs[0]) * pi->num_progs);
     1481    /* We cannot copy entire pi->progs[] vector! Double free()s will happen */
     1482    for (i = 0; i < pi->num_progs; i++) {
     1483// TODO: do we really need to have so many fields which are just dead weight
     1484// at execution stage?
     1485        thejob->progs[i].pid = pi->progs[i].pid;
     1486        /* all other fields are not used and stay zero */
     1487    }
    11621488    thejob->next = NULL;
    1163     thejob->running_progs = thejob->num_progs;
    1164     thejob->stopped_progs = 0;
    1165     thejob->text = xmalloc(BUFSIZ); /* cmdedit buffer size */
    1166 
    1167     //if (pi->progs[0] && pi->progs[0].argv && pi->progs[0].argv[0])
    1168     {
    1169         char *bar=thejob->text;
    1170         char **foo=pi->progs[0].argv;
    1171         while(foo && *foo) {
    1172             bar += sprintf(bar, "%s ", *foo++);
    1173         }
    1174     }
    1175 
    1176     /* we don't wait for background thejobs to return -- append it
     1489    thejob->cmdtext = xstrdup(get_cmdtext(pi));
     1490
     1491    /* We don't wait for background thejobs to return -- append it
    11771492       to the list of backgrounded thejobs and leave it alone */
    1178     printf("[%d] %d\n", thejob->jobid, thejob->progs[0].pid);
     1493    printf("[%d] %d %s\n", thejob->jobid, thejob->progs[0].pid, thejob->cmdtext);
    11791494    last_bg_pid = thejob->progs[0].pid;
    11801495    last_jobid = thejob->jobid;
    11811496}
    11821497
    1183 /* remove a backgrounded job */
    11841498static void remove_bg_job(struct pipe *pi)
    11851499{
     
    11981512    else
    11991513        last_jobid = 0;
    1200 
     1514}
     1515
     1516/* remove a backgrounded job */
     1517static void delete_finished_bg_job(struct pipe *pi)
     1518{
     1519    remove_bg_job(pi);
    12011520    pi->stopped_progs = 0;
    12021521    free_pipe(pi, 0);
    12031522    free(pi);
    12041523}
     1524#endif /* JOB */
    12051525
    12061526/* Checks to see if any processes have exited -- if they
     
    12101530    int attributes;
    12111531    int status;
     1532#if ENABLE_HUSH_JOB
    12121533    int prognum = 0;
    12131534    struct pipe *pi;
     1535#endif
    12141536    pid_t childpid;
     1537    int rcode = 0;
    12151538
    12161539    attributes = WUNTRACED;
    1217     if (fg_pipe==NULL) {
     1540    if (fg_pipe == NULL) {
    12181541        attributes |= WNOHANG;
    12191542    }
    12201543
     1544/* Do we do this right?
     1545 * bash-3.00# sleep 20 | false
     1546 * <ctrl-Z pressed>
     1547 * [3]+  Stopped          sleep 20 | false
     1548 * bash-3.00# echo $?
     1549 * 1   <========== bg pipe is not fully done, but exitcode is already known!
     1550 */
     1551
     1552//FIXME: non-interactive bash does not continue even if all processes in fg pipe
     1553//are stopped. Testcase: "cat | cat" in a script (not on command line)
     1554// + killall -STOP cat
     1555
     1556 wait_more:
    12211557    while ((childpid = waitpid(-1, &status, attributes)) > 0) {
     1558        const int dead = WIFEXITED(status) || WIFSIGNALED(status);
     1559
     1560#ifdef DEBUG_SHELL_JOBS
     1561        if (WIFSTOPPED(status))
     1562            debug_printf_jobs("pid %d stopped by sig %d (exitcode %d)\n",
     1563                    childpid, WSTOPSIG(status), WEXITSTATUS(status));
     1564        if (WIFSIGNALED(status))
     1565            debug_printf_jobs("pid %d killed by sig %d (exitcode %d)\n",
     1566                    childpid, WTERMSIG(status), WEXITSTATUS(status));
     1567        if (WIFEXITED(status))
     1568            debug_printf_jobs("pid %d exited, exitcode %d\n",
     1569                    childpid, WEXITSTATUS(status));
     1570#endif
     1571        /* Were we asked to wait for fg pipe? */
    12221572        if (fg_pipe) {
    1223             int i, rcode = 0;
    1224             for (i=0; i < fg_pipe->num_progs; i++) {
     1573            int i;
     1574            for (i = 0; i < fg_pipe->num_progs; i++) {
     1575                debug_printf_jobs("check pid %d\n", fg_pipe->progs[i].pid);
    12251576                if (fg_pipe->progs[i].pid == childpid) {
    1226                     if (i==fg_pipe->num_progs-1)
    1227                         rcode=WEXITSTATUS(status);
    1228                     (fg_pipe->num_progs)--;
    1229                     return(rcode);
     1577                    /* printf("process %d exit %d\n", i, WEXITSTATUS(status)); */
     1578                    if (dead) {
     1579                        fg_pipe->progs[i].pid = 0;
     1580                        fg_pipe->running_progs--;
     1581                        if (i == fg_pipe->num_progs-1)
     1582                            /* last process gives overall exitstatus */
     1583                            rcode = WEXITSTATUS(status);
     1584                    } else {
     1585                        fg_pipe->progs[i].is_stopped = 1;
     1586                        fg_pipe->stopped_progs++;
     1587                    }
     1588                    debug_printf_jobs("fg_pipe: running_progs %d stopped_progs %d\n",
     1589                            fg_pipe->running_progs, fg_pipe->stopped_progs);
     1590                    if (fg_pipe->running_progs - fg_pipe->stopped_progs <= 0) {
     1591                        /* All processes in fg pipe have exited/stopped */
     1592#if ENABLE_HUSH_JOB
     1593                        if (fg_pipe->running_progs)
     1594                            insert_bg_job(fg_pipe);
     1595#endif
     1596                        return rcode;
     1597                    }
     1598                    /* There are still running processes in the fg pipe */
     1599                    goto wait_more;
    12301600                }
    12311601            }
    1232         }
    1233 
     1602            /* fall through to searching process in bg pipes */
     1603        }
     1604
     1605#if ENABLE_HUSH_JOB
     1606        /* We asked to wait for bg or orphaned children */
     1607        /* No need to remember exitcode in this case */
    12341608        for (pi = job_list; pi; pi = pi->next) {
    12351609            prognum = 0;
    1236             while (prognum < pi->num_progs && pi->progs[prognum].pid != childpid) {
     1610            while (prognum < pi->num_progs) {
     1611                if (pi->progs[prognum].pid == childpid)
     1612                    goto found_pi_and_prognum;
    12371613                prognum++;
    12381614            }
    1239             if (prognum < pi->num_progs)
    1240                 break;
    1241         }
    1242 
    1243         if(pi==NULL) {
    1244             debug_printf("checkjobs: pid %d was not in our list!\n", childpid);
    1245             continue;
    1246         }
    1247 
    1248         if (WIFEXITED(status) || WIFSIGNALED(status)) {
     1615        }
     1616#endif
     1617
     1618        /* Happens when shell is used as init process (init=/bin/sh) */
     1619        debug_printf("checkjobs: pid %d was not in our list!\n", childpid);
     1620        goto wait_more;
     1621
     1622#if ENABLE_HUSH_JOB
     1623 found_pi_and_prognum:
     1624        if (dead) {
    12491625            /* child exited */
     1626            pi->progs[prognum].pid = 0;
    12501627            pi->running_progs--;
    1251             pi->progs[prognum].pid = 0;
    1252 
    12531628            if (!pi->running_progs) {
    1254                 printf(JOB_STATUS_FORMAT, pi->jobid, "Done", pi->text);
    1255                 remove_bg_job(pi);
     1629                printf(JOB_STATUS_FORMAT, pi->jobid,
     1630                            "Done", pi->cmdtext);
     1631                delete_finished_bg_job(pi);
    12561632            }
    12571633        } else {
     
    12591635            pi->stopped_progs++;
    12601636            pi->progs[prognum].is_stopped = 1;
    1261 
    1262 #if 0
    1263             /* Printing this stuff is a pain, since it tends to
    1264              * overwrite the prompt an inconveinient moments.  So
    1265              * don't do that.  */
    1266             if (pi->stopped_progs == pi->num_progs) {
    1267                 printf("\n"JOB_STATUS_FORMAT, pi->jobid, "Stopped", pi->text);
    1268             }
    1269 #endif
    1270         }
    1271     }
    1272 
    1273     if (childpid == -1 && errno != ECHILD)
     1637        }
     1638#endif
     1639    }
     1640
     1641    /* wait found no children or failed */
     1642
     1643    if (childpid && errno != ECHILD)
    12741644        bb_perror_msg("waitpid");
    1275 
    1276     /* move the shell to the foreground */
    1277     //if (interactive && tcsetpgrp(shell_terminal, getpgid(0)))
    1278     //  bb_perror_msg("tcsetpgrp-2");
    1279     return -1;
    1280 }
    1281 
    1282 /* Figure out our controlling tty, checking in order stderr,
    1283  * stdin, and stdout.  If check_pgrp is set, also check that
    1284  * we belong to the foreground process group associated with
    1285  * that tty.  The value of shell_terminal is needed in order to call
    1286  * tcsetpgrp(shell_terminal, ...); */
    1287 #if 0
    1288 static void controlling_tty(int check_pgrp)
    1289 {
    1290     pid_t curpgrp;
    1291 
    1292     if ((curpgrp = tcgetpgrp(shell_terminal = 2)) < 0
    1293             && (curpgrp = tcgetpgrp(shell_terminal = 0)) < 0
    1294             && (curpgrp = tcgetpgrp(shell_terminal = 1)) < 0)
    1295         goto shell_terminal_error;
    1296 
    1297     if (check_pgrp && curpgrp != getpgid(0))
    1298         goto shell_terminal_error;
    1299 
    1300     return;
    1301 
    1302 shell_terminal_error:
    1303         shell_terminal = -1;
    1304         return;
     1645    return rcode;
     1646}
     1647
     1648#if ENABLE_HUSH_JOB
     1649static int checkjobs_and_fg_shell(struct pipe* fg_pipe)
     1650{
     1651    pid_t p;
     1652    int rcode = checkjobs(fg_pipe);
     1653    /* Job finished, move the shell to the foreground */
     1654    p = getpgid(0); /* pgid of our process */
     1655    debug_printf_jobs("fg'ing ourself: getpgid(0)=%d\n", (int)p);
     1656    if (tcsetpgrp(interactive_fd, p) && errno != ENOTTY)
     1657        bb_perror_msg("tcsetpgrp-4a");
     1658    return rcode;
    13051659}
    13061660#endif
     
    13211675 * now has its stdout directed to the input of the appropriate pipe,
    13221676 * so this routine is noticeably simpler.
     1677 *
     1678 * Returns -1 only if started some children. IOW: we have to
     1679 * mask out retvals of builtins etc with 0xff!
    13231680 */
    13241681static int run_pipe_real(struct pipe *pi)
     
    13301687    const struct built_in_command *x;
    13311688    char *p;
     1689    /* it is not always needed, but we aim to smaller code */
     1690    int squirrel[] = { -1, -1, -1 };
     1691    int rcode;
     1692    const int single_fg = (pi->num_progs == 1 && pi->followup != PIPE_BG);
     1693
     1694    debug_printf_exec("run_pipe_real start: single_fg=%d\n", single_fg);
    13321695
    13331696    nextin = 0;
     1697#if ENABLE_HUSH_JOB
    13341698    pi->pgrp = -1;
     1699#endif
     1700    pi->running_progs = 1;
     1701    pi->stopped_progs = 0;
    13351702
    13361703    /* Check if this is a simple builtin (not part of a pipe).
     
    13381705     * pseudo_exec.  "echo foo | read bar" doesn't work on bash, either.
    13391706     */
    1340     if (pi->num_progs == 1) child = & (pi->progs[0]);
    1341     if (pi->num_progs == 1 && child->group && child->subshell == 0) {
    1342         int squirrel[] = {-1, -1, -1};
    1343         int rcode;
     1707    child = &(pi->progs[0]);
     1708    if (single_fg && child->group && child->subshell == 0) {
    13441709        debug_printf("non-subshell grouping\n");
    13451710        setup_redirects(child, squirrel);
    1346         /* XXX could we merge code with following builtin case,
    1347          * by creating a pseudo builtin that calls run_list_real? */
     1711        debug_printf_exec(": run_list_real\n");
    13481712        rcode = run_list_real(child->group);
    13491713        restore_redirects(squirrel);
    1350         return rcode;
    1351     } else if (pi->num_progs == 1 && pi->progs[0].argv != NULL) {
    1352         for (i=0; is_assignment(child->argv[i]); i++) { /* nothing */ }
    1353         if (i!=0 && child->argv[i]==NULL) {
     1714        debug_printf_exec("run_pipe_real return %d\n", rcode);
     1715        return rcode; // do we need to add '... & 0xff' ?
     1716    }
     1717
     1718    if (single_fg && child->argv != NULL) {
     1719        char **argv_expanded;
     1720        char **argv = child->argv;
     1721
     1722        for (i = 0; is_assignment(argv[i]); i++)
     1723            continue;
     1724        if (i != 0 && argv[i] == NULL) {
    13541725            /* assignments, but no command: set the local environment */
    1355             for (i=0; child->argv[i]!=NULL; i++) {
    1356 
    1357                 /* Ok, this case is tricky.  We have to decide if this is a
    1358                  * local variable, or an already exported variable.  If it is
    1359                  * already exported, we have to export the new value.  If it is
    1360                  * not exported, we need only set this as a local variable.
    1361                  * This junk is all to decide whether or not to export this
    1362                  * variable. */
    1363                 int export_me=0;
    1364                 char *name, *value;
    1365                 name = bb_xstrdup(child->argv[i]);
    1366                 debug_printf("Local environment set: %s\n", name);
    1367                 value = strchr(name, '=');
    1368                 if (value)
    1369                     *value=0;
    1370                 if ( get_local_var(name)) {
    1371                     export_me=1;
    1372                 }
    1373                 free(name);
    1374                 p = insert_var_value(child->argv[i]);
    1375                 set_local_var(p, export_me);
    1376                 if (p != child->argv[i]) free(p);
     1726            for (i = 0; argv[i] != NULL; i++) {
     1727                debug_printf("local environment set: %s\n", argv[i]);
     1728                p = expand_string_to_string(argv[i]);
     1729                set_local_var(p, 0);
    13771730            }
    13781731            return EXIT_SUCCESS;   /* don't worry about errors in set_local_var() yet */
    13791732        }
    1380         for (i = 0; is_assignment(child->argv[i]); i++) {
    1381             p = insert_var_value(child->argv[i]);
    1382             putenv(strdup(p));
    1383             if (p != child->argv[i]) {
    1384                 child->sp--;
    1385                 free(p);
    1386             }
    1387         }
    1388         if (child->sp) {
    1389             char * str = NULL;
    1390 
    1391             str = make_string((child->argv + i));
    1392             parse_string_outer(str, FLAG_EXIT_FROM_LOOP | FLAG_REPARSING);
    1393             free(str);
    1394             return last_return_code;
     1733        for (i = 0; is_assignment(argv[i]); i++) {
     1734            p = expand_string_to_string(argv[i]);
     1735            //sp: child->sp--;
     1736            putenv(p);
    13951737        }
    13961738        for (x = bltins; x->cmd; x++) {
    1397             if (strcmp(child->argv[i], x->cmd) == 0 ) {
    1398                 int squirrel[] = {-1, -1, -1};
    1399                 int rcode;
    1400                 if (x->function == builtin_exec && child->argv[i+1]==NULL) {
     1739            if (strcmp(argv[i], x->cmd) == 0) {
     1740                if (x->function == builtin_exec && argv[i+1] == NULL) {
    14011741                    debug_printf("magic exec\n");
    1402                     setup_redirects(child,NULL);
     1742                    setup_redirects(child, NULL);
    14031743                    return EXIT_SUCCESS;
    14041744                }
    1405                 debug_printf("builtin inline %s\n", child->argv[0]);
     1745                debug_printf("builtin inline %s\n", argv[0]);
    14061746                /* XXX setup_redirects acts on file descriptors, not FILEs.
    14071747                 * This is perfect for work that comes after exec().
     
    14091749                 * things seem to work with glibc. */
    14101750                setup_redirects(child, squirrel);
    1411                 child->argv+=i;  /* XXX horrible hack */
    1412                 rcode = x->function(child);
    1413                 child->argv-=i;  /* XXX restore hack so free() can work right */
     1751                debug_printf_exec(": builtin '%s' '%s'...\n", x->cmd, argv[i+1]);
     1752                //sp: if (child->sp) /* btw we can do it unconditionally... */
     1753                argv_expanded = expand_strvec_to_strvec(argv + i);
     1754                rcode = x->function(argv_expanded) & 0xff;
     1755                free(argv_expanded);
    14141756                restore_redirects(squirrel);
     1757                debug_printf_exec("run_pipe_real return %d\n", rcode);
    14151758                return rcode;
    14161759            }
    14171760        }
    1418     }
     1761#if ENABLE_FEATURE_SH_STANDALONE
     1762        {
     1763            const struct bb_applet *a = find_applet_by_name(argv[i]);
     1764            if (a && a->nofork) {
     1765                setup_redirects(child, squirrel);
     1766                save_nofork_data(&nofork_save);
     1767                argv_expanded = argv + i;
     1768                //sp: if (child->sp)
     1769                argv_expanded = expand_strvec_to_strvec(argv + i);
     1770                debug_printf_exec(": run_nofork_applet '%s' '%s'...\n", argv_expanded[0], argv_expanded[1]);
     1771                rcode = run_nofork_applet_prime(&nofork_save, a, argv_expanded) & 0xff;
     1772                free(argv_expanded);
     1773                restore_redirects(squirrel);
     1774                debug_printf_exec("run_pipe_real return %d\n", rcode);
     1775                return rcode;
     1776            }
     1777        }
     1778#endif
     1779    }
     1780
     1781    /* Going to fork a child per each pipe member */
     1782    pi->running_progs = 0;
     1783
     1784    /* Disable job control signals for shell (parent) and
     1785     * for initial child code after fork */
     1786    set_jobctrl_sighandler(SIG_IGN);
    14191787
    14201788    for (i = 0; i < pi->num_progs; i++) {
    1421         child = & (pi->progs[i]);
     1789        child = &(pi->progs[i]);
     1790        if (child->argv)
     1791            debug_printf_exec(": pipe member '%s' '%s'...\n", child->argv[0], child->argv[1]);
     1792        else
     1793            debug_printf_exec(": pipe member with no argv\n");
    14221794
    14231795        /* pipes are inserted between pairs of commands */
    14241796        if ((i + 1) < pi->num_progs) {
    1425             if (pipe(pipefds)<0) bb_perror_msg_and_die("pipe");
     1797            pipe(pipefds);
    14261798            nextout = pipefds[1];
    14271799        } else {
    1428             nextout=1;
     1800            nextout = 1;
    14291801            pipefds[0] = -1;
    14301802        }
    14311803
    14321804        /* XXX test for failed fork()? */
    1433 #if !defined(__UCLIBC__) || defined(__ARCH_HAS_MMU__)
    1434         if (!(child->pid = fork()))
     1805#if BB_MMU
     1806        child->pid = fork();
    14351807#else
    1436         if (!(child->pid = vfork()))
    1437 #endif
    1438         {
    1439             /* Set the handling for job control signals back to the default.  */
    1440             signal(SIGINT, SIG_DFL);
    1441             signal(SIGQUIT, SIG_DFL);
    1442             signal(SIGTERM, SIG_DFL);
    1443             signal(SIGTSTP, SIG_DFL);
    1444             signal(SIGTTIN, SIG_DFL);
    1445             signal(SIGTTOU, SIG_DFL);
    1446             signal(SIGCHLD, SIG_DFL);
    1447 
     1808        child->pid = vfork();
     1809#endif
     1810        if (!child->pid) { /* child */
     1811            /* Every child adds itself to new process group
     1812             * with pgid == pid of first child in pipe */
     1813#if ENABLE_HUSH_JOB
     1814            if (run_list_level == 1 && interactive_fd) {
     1815                /* Don't do pgrp restore anymore on fatal signals */
     1816                set_fatal_sighandler(SIG_DFL);
     1817                if (pi->pgrp < 0) /* true for 1st process only */
     1818                    pi->pgrp = getpid();
     1819                if (setpgid(0, pi->pgrp) == 0 && pi->followup != PIPE_BG) {
     1820                    /* We do it in *every* child, not just first,
     1821                     * to avoid races */
     1822                    tcsetpgrp(interactive_fd, pi->pgrp);
     1823                }
     1824            }
     1825#endif
     1826            /* in non-interactive case fatal sigs are already SIG_DFL */
    14481827            close_all();
    1449 
    14501828            if (nextin != 0) {
    14511829                dup2(nextin, 0);
     
    14561834                close(nextout);
    14571835            }
    1458             if (pipefds[0]!=-1) {
     1836            if (pipefds[0] != -1) {
    14591837                close(pipefds[0]);  /* opposite end of our output pipe */
    14601838            }
    1461 
    14621839            /* Like bash, explicit redirects override pipes,
    14631840             * and the pipe fd is available for dup'ing. */
    1464             setup_redirects(child,NULL);
    1465 
    1466             if (interactive && pi->followup!=PIPE_BG) {
    1467                 /* If we (the child) win the race, put ourselves in the process
    1468                  * group whose leader is the first process in this pipe. */
    1469                 if (pi->pgrp < 0) {
    1470                     pi->pgrp = getpid();
    1471                 }
    1472                 if (setpgid(0, pi->pgrp) == 0) {
    1473                     tcsetpgrp(2, pi->pgrp);
    1474                 }
    1475             }
    1476 
     1841            setup_redirects(child, NULL);
     1842
     1843            /* Restore default handlers just prior to exec */
     1844            set_jobctrl_sighandler(SIG_DFL);
     1845            set_misc_sighandler(SIG_DFL);
     1846            signal(SIGCHLD, SIG_DFL);
    14771847            pseudo_exec(child);
    14781848        }
    14791849
    1480 
    1481         /* put our child in the process group whose leader is the
    1482            first process in this pipe */
    1483         if (pi->pgrp < 0) {
     1850        pi->running_progs++;
     1851
     1852#if ENABLE_HUSH_JOB
     1853        /* Second and next children need to know pid of first one */
     1854        if (pi->pgrp < 0)
    14841855            pi->pgrp = child->pid;
    1485         }
    1486         /* Don't check for errors.  The child may be dead already,
    1487          * in which case setpgid returns error code EACCES. */
    1488         setpgid(child->pid, pi->pgrp);
    1489 
     1856#endif
    14901857        if (nextin != 0)
    14911858            close(nextin);
     
    14971864        nextin = pipefds[0];
    14981865    }
     1866    debug_printf_exec("run_pipe_real return -1\n");
    14991867    return -1;
    15001868}
    15011869
     1870#ifndef debug_print_tree
     1871static void debug_print_tree(struct pipe *pi, int lvl)
     1872{
     1873    static const char *PIPE[] = {
     1874        [PIPE_SEQ] = "SEQ",
     1875        [PIPE_AND] = "AND",
     1876        [PIPE_OR ] = "OR" ,
     1877        [PIPE_BG ] = "BG" ,
     1878    };
     1879    static const char *RES[] = {
     1880        [RES_NONE ] = "NONE" ,
     1881#if ENABLE_HUSH_IF
     1882        [RES_IF   ] = "IF"   ,
     1883        [RES_THEN ] = "THEN" ,
     1884        [RES_ELIF ] = "ELIF" ,
     1885        [RES_ELSE ] = "ELSE" ,
     1886        [RES_FI   ] = "FI"   ,
     1887#endif
     1888#if ENABLE_HUSH_LOOPS
     1889        [RES_FOR  ] = "FOR"  ,
     1890        [RES_WHILE] = "WHILE",
     1891        [RES_UNTIL] = "UNTIL",
     1892        [RES_DO   ] = "DO"   ,
     1893        [RES_DONE ] = "DONE" ,
     1894        [RES_IN   ] = "IN"   ,
     1895#endif
     1896        [RES_XXXX ] = "XXXX" ,
     1897        [RES_SNTX ] = "SNTX" ,
     1898    };
     1899
     1900    int pin, prn;
     1901
     1902    pin = 0;
     1903    while (pi) {
     1904        fprintf(stderr, "%*spipe %d res_word=%s followup=%d %s\n", lvl*2, "",
     1905                pin, RES[pi->res_word], pi->followup, PIPE[pi->followup]);
     1906        prn = 0;
     1907        while (prn < pi->num_progs) {
     1908            struct child_prog *child = &pi->progs[prn];
     1909            char **argv = child->argv;
     1910
     1911            fprintf(stderr, "%*s prog %d", lvl*2, "", prn);
     1912            if (child->group) {
     1913                fprintf(stderr, " group %s: (argv=%p)\n",
     1914                        (child->subshell ? "()" : "{}"),
     1915                        argv);
     1916                debug_print_tree(child->group, lvl+1);
     1917                prn++;
     1918                continue;
     1919            }
     1920            if (argv) while (*argv) {
     1921                fprintf(stderr, " '%s'", *argv);
     1922                argv++;
     1923            }
     1924            fprintf(stderr, "\n");
     1925            prn++;
     1926        }
     1927        pi = pi->next;
     1928        pin++;
     1929    }
     1930}
     1931#endif
     1932
     1933/* NB: called by pseudo_exec, and therefore must not modify any
     1934 * global data until exec/_exit (we can be a child after vfork!) */
    15021935static int run_list_real(struct pipe *pi)
    15031936{
    1504     char *save_name = NULL;
    1505     char **list = NULL;
    1506     char **save_list = NULL;
    15071937    struct pipe *rpipe;
     1938#if ENABLE_HUSH_LOOPS
     1939    char *for_varname = NULL;
     1940    char **for_lcur = NULL;
     1941    char **for_list = NULL;
    15081942    int flag_rep = 0;
     1943#endif
    15091944    int save_num_progs;
    1510     int rcode=0, flag_skip=1;
     1945    int flag_skip = 1;
     1946    int rcode = 0; /* probably for gcc only */
    15111947    int flag_restore = 0;
    1512     int if_code=0, next_if_code=0;  /* need double-buffer to handle elif */
    1513     reserved_style rmode, skip_more_in_this_rmode=RES_XXXX;
     1948#if ENABLE_HUSH_IF
     1949    int if_code = 0, next_if_code = 0;  /* need double-buffer to handle elif */
     1950#else
     1951    enum { if_code = 0, next_if_code = 0 };
     1952#endif
     1953    reserved_style rword;
     1954    reserved_style skip_more_for_this_rword = RES_XXXX;
     1955
     1956    debug_printf_exec("run_list_real start lvl %d\n", run_list_level + 1);
     1957
     1958#if ENABLE_HUSH_LOOPS
    15141959    /* check syntax for "for" */
    15151960    for (rpipe = pi; rpipe; rpipe = rpipe->next) {
    1516         if ((rpipe->r_mode == RES_IN ||
    1517             rpipe->r_mode == RES_FOR) &&
    1518             (rpipe->next == NULL)) {
    1519                 syntax();
    1520                 return 1;
    1521         }
    1522         if ((rpipe->r_mode == RES_IN &&
    1523             (rpipe->next->r_mode == RES_IN &&
    1524             rpipe->next->progs->argv != NULL))||
    1525             (rpipe->r_mode == RES_FOR &&
    1526             rpipe->next->r_mode != RES_IN)) {
    1527                 syntax();
    1528                 return 1;
    1529         }
    1530     }
    1531     for (; pi; pi = (flag_restore != 0) ? rpipe : pi->next) {
    1532         if (pi->r_mode == RES_WHILE || pi->r_mode == RES_UNTIL ||
    1533             pi->r_mode == RES_FOR) {
    1534                 flag_restore = 0;
    1535                 if (!rpipe) {
    1536                     flag_rep = 0;
    1537                     rpipe = pi;
    1538                 }
    1539         }
    1540         rmode = pi->r_mode;
    1541         debug_printf("rmode=%d  if_code=%d  next_if_code=%d skip_more=%d\n", rmode, if_code, next_if_code, skip_more_in_this_rmode);
    1542         if (rmode == skip_more_in_this_rmode && flag_skip) {
    1543             if (pi->followup == PIPE_SEQ) flag_skip=0;
     1961        if ((rpipe->res_word == RES_IN || rpipe->res_word == RES_FOR)
     1962         && (rpipe->next == NULL)
     1963        ) {
     1964            syntax("malformed for"); /* no IN or no commands after IN */
     1965            debug_printf_exec("run_list_real lvl %d return 1\n", run_list_level);
     1966            return 1;
     1967        }
     1968        if ((rpipe->res_word == RES_IN && rpipe->next->res_word == RES_IN && rpipe->next->progs[0].argv != NULL)
     1969         || (rpipe->res_word == RES_FOR && rpipe->next->res_word != RES_IN)
     1970        ) {
     1971            /* TODO: what is tested in the first condition? */
     1972            syntax("malformed for"); /* 2nd condition: not followed by IN */
     1973            debug_printf_exec("run_list_real lvl %d return 1\n", run_list_level);
     1974            return 1;
     1975        }
     1976    }
     1977#else
     1978    rpipe = NULL;
     1979#endif
     1980
     1981#if ENABLE_HUSH_JOB
     1982    /* Example of nested list: "while true; do { sleep 1 | exit 2; } done".
     1983     * We are saving state before entering outermost list ("while...done")
     1984     * so that ctrl-Z will correctly background _entire_ outermost list,
     1985     * not just a part of it (like "sleep 1 | exit 2") */
     1986    if (++run_list_level == 1 && interactive_fd) {
     1987        if (sigsetjmp(toplevel_jb, 1)) {
     1988            /* ctrl-Z forked and we are parent; or ctrl-C.
     1989             * Sighandler has longjmped us here */
     1990            signal(SIGINT, SIG_IGN);
     1991            signal(SIGTSTP, SIG_IGN);
     1992            /* Restore level (we can be coming from deep inside
     1993             * nested levels) */
     1994            run_list_level = 1;
     1995#if ENABLE_FEATURE_SH_STANDALONE
     1996            if (nofork_save.saved) { /* if save area is valid */
     1997                debug_printf_jobs("exiting nofork early\n");
     1998                restore_nofork_data(&nofork_save);
     1999            }
     2000#endif
     2001            if (ctrl_z_flag) {
     2002                /* ctrl-Z has forked and stored pid of the child in pi->pid.
     2003                 * Remember this child as background job */
     2004                insert_bg_job(pi);
     2005            } else {
     2006                /* ctrl-C. We just stop doing whatever we were doing */
     2007                putchar('\n');
     2008            }
     2009            rcode = 0;
     2010            goto ret;
     2011        }
     2012        /* ctrl-Z handler will store pid etc in pi */
     2013        toplevel_list = pi;
     2014        ctrl_z_flag = 0;
     2015#if ENABLE_FEATURE_SH_STANDALONE
     2016        nofork_save.saved = 0; /* in case we will run a nofork later */
     2017#endif
     2018        signal_SA_RESTART(SIGTSTP, handler_ctrl_z);
     2019        signal(SIGINT, handler_ctrl_c);
     2020    }
     2021#endif
     2022
     2023    for (; pi; pi = flag_restore ? rpipe : pi->next) {
     2024        rword = pi->res_word;
     2025#if ENABLE_HUSH_LOOPS
     2026        if (rword == RES_WHILE || rword == RES_UNTIL || rword == RES_FOR) {
     2027            flag_restore = 0;
     2028            if (!rpipe) {
     2029                flag_rep = 0;
     2030                rpipe = pi;
     2031            }
     2032        }
     2033#endif
     2034        debug_printf_exec(": rword=%d if_code=%d next_if_code=%d skip_more=%d\n",
     2035                rword, if_code, next_if_code, skip_more_for_this_rword);
     2036        if (rword == skip_more_for_this_rword && flag_skip) {
     2037            if (pi->followup == PIPE_SEQ)
     2038                flag_skip = 0;
    15442039            continue;
    15452040        }
    15462041        flag_skip = 1;
    1547         skip_more_in_this_rmode = RES_XXXX;
    1548         if (rmode == RES_THEN || rmode == RES_ELSE) if_code = next_if_code;
    1549         if (rmode == RES_THEN &&  if_code) continue;
    1550         if (rmode == RES_ELSE && !if_code) continue;
    1551         if (rmode == RES_ELIF && !if_code) break;
    1552         if (rmode == RES_FOR && pi->num_progs) {
    1553             if (!list) {
     2042        skip_more_for_this_rword = RES_XXXX;
     2043#if ENABLE_HUSH_IF
     2044        if (rword == RES_THEN || rword == RES_ELSE)
     2045            if_code = next_if_code;
     2046        if (rword == RES_THEN && if_code)
     2047            continue;
     2048        if (rword == RES_ELSE && !if_code)
     2049            continue;
     2050        if (rword == RES_ELIF && !if_code)
     2051            break;
     2052#endif
     2053#if ENABLE_HUSH_LOOPS
     2054        if (rword == RES_FOR && pi->num_progs) {
     2055            if (!for_lcur) {
    15542056                /* if no variable values after "in" we skip "for" */
    1555                 if (!pi->next->progs->argv) continue;
     2057                if (!pi->next->progs->argv)
     2058                    continue;
    15562059                /* create list of variable values */
    1557                 list = make_list_in(pi->next->progs->argv,
    1558                     pi->progs->argv[0]);
    1559                 save_list = list;
    1560                 save_name = pi->progs->argv[0];
     2060                for_list = expand_strvec_to_strvec(pi->next->progs->argv);
     2061                for_lcur = for_list;
     2062                for_varname = pi->progs->argv[0];
    15612063                pi->progs->argv[0] = NULL;
    15622064                flag_rep = 1;
    15632065            }
    1564             if (!(*list)) {
    1565                 free(pi->progs->argv[0]);
    1566                 free(save_list);
    1567                 list = NULL;
     2066            free(pi->progs->argv[0]);
     2067            if (!*for_lcur) {
     2068                free(for_list);
     2069                for_lcur = NULL;
    15682070                flag_rep = 0;
    1569                 pi->progs->argv[0] = save_name;
    1570                 pi->progs->glob_result.gl_pathv[0] =
    1571                     pi->progs->argv[0];
     2071                pi->progs->argv[0] = for_varname;
     2072                pi->progs->glob_result.gl_pathv[0] = pi->progs->argv[0];
    15722073                continue;
    1573             } else {
    1574                 /* insert new value from list for variable */
    1575                 if (pi->progs->argv[0])
    1576                     free(pi->progs->argv[0]);
    1577                 pi->progs->argv[0] = *list++;
    1578                 pi->progs->glob_result.gl_pathv[0] =
    1579                     pi->progs->argv[0];
    1580             }
    1581         }
    1582         if (rmode == RES_IN) continue;
    1583         if (rmode == RES_DO) {
    1584             if (!flag_rep) continue;
    1585         }
    1586         if ((rmode == RES_DONE)) {
     2074            }
     2075            /* insert next value from for_lcur */
     2076            /* vda: does it need escaping? */
     2077            pi->progs->argv[0] = xasprintf("%s=%s", for_varname, *for_lcur++);
     2078            pi->progs->glob_result.gl_pathv[0] = pi->progs->argv[0];
     2079        }
     2080        if (rword == RES_IN)
     2081            continue;
     2082        if (rword == RES_DO) {
     2083            if (!flag_rep)
     2084                continue;
     2085        }
     2086        if (rword == RES_DONE) {
    15872087            if (flag_rep) {
    15882088                flag_restore = 1;
     
    15912091            }
    15922092        }
    1593         if (pi->num_progs == 0) continue;
     2093#endif
     2094        if (pi->num_progs == 0)
     2095            continue;
    15942096        save_num_progs = pi->num_progs; /* save number of programs */
     2097        debug_printf_exec(": run_pipe_real with %d members\n", pi->num_progs);
    15952098        rcode = run_pipe_real(pi);
    1596         debug_printf("run_pipe_real returned %d\n",rcode);
    1597         if (rcode!=-1) {
     2099        if (rcode != -1) {
    15982100            /* We only ran a builtin: rcode was set by the return value
    15992101             * of run_pipe_real(), and we don't need to wait for anything. */
    1600         } else if (pi->followup==PIPE_BG) {
    1601             /* XXX check bash's behavior with nontrivial pipes */
    1602             /* XXX compute jobid */
    1603             /* XXX what does bash do with attempts to background builtins? */
    1604             insert_bg_job(pi);
     2102        } else if (pi->followup == PIPE_BG) {
     2103            /* What does bash do with attempts to background builtins? */
     2104            /* Even bash 3.2 doesn't do that well with nested bg:
     2105             * try "{ { sleep 10; echo DEEP; } & echo HERE; } &".
     2106             * I'm NOT treating inner &'s as jobs */
     2107#if ENABLE_HUSH_JOB
     2108            if (run_list_level == 1)
     2109                insert_bg_job(pi);
     2110#endif
    16052111            rcode = EXIT_SUCCESS;
    16062112        } else {
    1607             if (interactive) {
    1608                 /* move the new process group into the foreground */
    1609                 if (tcsetpgrp(shell_terminal, pi->pgrp) && errno != ENOTTY)
    1610                     bb_perror_msg("tcsetpgrp-3");
     2113#if ENABLE_HUSH_JOB
     2114            /* Paranoia, just "interactive_fd" should be enough? */
     2115            if (run_list_level == 1 && interactive_fd) {
     2116                /* waits for completion, then fg's main shell */
     2117                rcode = checkjobs_and_fg_shell(pi);
     2118            } else
     2119#endif
     2120            {
     2121                /* this one just waits for completion */
    16112122                rcode = checkjobs(pi);
    1612                 /* move the shell to the foreground */
    1613                 if (tcsetpgrp(shell_terminal, getpgid(0)) && errno != ENOTTY)
    1614                     bb_perror_msg("tcsetpgrp-4");
    1615             } else {
    1616                 rcode = checkjobs(pi);
    1617             }
    1618             debug_printf("checkjobs returned %d\n",rcode);
    1619         }
    1620         last_return_code=rcode;
     2123            }
     2124            debug_printf_exec(": checkjobs returned %d\n", rcode);
     2125        }
     2126        debug_printf_exec(": setting last_return_code=%d\n", rcode);
     2127        last_return_code = rcode;
    16212128        pi->num_progs = save_num_progs; /* restore number of programs */
    1622         if ( rmode == RES_IF || rmode == RES_ELIF )
    1623             next_if_code=rcode;  /* can be overwritten a number of times */
    1624         if (rmode == RES_WHILE)
     2129#if ENABLE_HUSH_IF
     2130        if (rword == RES_IF || rword == RES_ELIF)
     2131            next_if_code = rcode;  /* can be overwritten a number of times */
     2132#endif
     2133#if ENABLE_HUSH_LOOPS
     2134        if (rword == RES_WHILE)
    16252135            flag_rep = !last_return_code;
    1626         if (rmode == RES_UNTIL)
     2136        if (rword == RES_UNTIL)
    16272137            flag_rep = last_return_code;
    1628         if ( (rcode==EXIT_SUCCESS && pi->followup==PIPE_OR) ||
    1629              (rcode!=EXIT_SUCCESS && pi->followup==PIPE_AND) )
    1630             skip_more_in_this_rmode=rmode;
     2138#endif
     2139        if ((rcode == EXIT_SUCCESS && pi->followup == PIPE_OR)
     2140         || (rcode != EXIT_SUCCESS && pi->followup == PIPE_AND)
     2141        ) {
     2142            skip_more_for_this_rword = rword;
     2143        }
    16312144        checkjobs(NULL);
    16322145    }
     2146
     2147#if ENABLE_HUSH_JOB
     2148    if (ctrl_z_flag) {
     2149        /* ctrl-Z forked somewhere in the past, we are the child,
     2150         * and now we completed running the list. Exit. */
     2151        exit(rcode);
     2152    }
     2153 ret:
     2154    if (!--run_list_level && interactive_fd) {
     2155        signal(SIGTSTP, SIG_IGN);
     2156        signal(SIGINT, SIG_IGN);
     2157    }
     2158#endif
     2159    debug_printf_exec("run_list_real lvl %d return %d\n", run_list_level + 1, rcode);
    16332160    return rcode;
    1634 }
    1635 
    1636 /* broken, of course, but OK for testing */
    1637 static char *indenter(int i)
    1638 {
    1639     static char blanks[]="                                    ";
    1640     return &blanks[sizeof(blanks)-i-1];
    16412161}
    16422162
     
    16472167    struct child_prog *child;
    16482168    struct redir_struct *r, *rnext;
    1649     int a, i, ret_code=0;
    1650     char *ind = indenter(indent);
     2169    int a, i, ret_code = 0;
    16512170
    16522171    if (pi->stopped_progs > 0)
    16532172        return ret_code;
    1654     final_printf("%s run pipe: (pid %d)\n",ind,getpid());
    1655     for (i=0; i<pi->num_progs; i++) {
     2173    debug_printf_clean("%s run pipe: (pid %d)\n", indenter(indent), getpid());
     2174    for (i = 0; i < pi->num_progs; i++) {
    16562175        child = &pi->progs[i];
    1657         final_printf("%s  command %d:\n",ind,i);
     2176        debug_printf_clean("%s  command %d:\n", indenter(indent), i);
    16582177        if (child->argv) {
    1659             for (a=0,p=child->argv; *p; a++,p++) {
    1660                 final_printf("%s   argv[%d] = %s\n",ind,a,*p);
     2178            for (a = 0, p = child->argv; *p; a++, p++) {
     2179                debug_printf_clean("%s   argv[%d] = %s\n", indenter(indent), a, *p);
    16612180            }
    16622181            globfree(&child->glob_result);
    1663             child->argv=NULL;
     2182            child->argv = NULL;
    16642183        } else if (child->group) {
    1665             final_printf("%s   begin group (subshell:%d)\n",ind, child->subshell);
    1666             ret_code = free_pipe_list(child->group,indent+3);
    1667             final_printf("%s   end group\n",ind);
     2184            debug_printf_clean("%s   begin group (subshell:%d)\n", indenter(indent), child->subshell);
     2185            ret_code = free_pipe_list(child->group, indent+3);
     2186            debug_printf_clean("%s   end group\n", indenter(indent));
    16682187        } else {
    1669             final_printf("%s   (nil)\n",ind);
    1670         }
    1671         for (r=child->redirects; r; r=rnext) {
    1672             final_printf("%s   redirect %d%s", ind, r->fd, redir_table[r->type].descrip);
     2188            debug_printf_clean("%s   (nil)\n", indenter(indent));
     2189        }
     2190        for (r = child->redirects; r; r = rnext) {
     2191            debug_printf_clean("%s   redirect %d%s", indenter(indent), r->fd, redir_table[r->type].descrip);
    16732192            if (r->dup == -1) {
    16742193                /* guard against the case >$FOO, where foo is unset or blank */
    16752194                if (r->word.gl_pathv) {
    1676                     final_printf(" %s\n", *r->word.gl_pathv);
     2195                    debug_printf_clean(" %s\n", *r->word.gl_pathv);
    16772196                    globfree(&r->word);
    16782197                }
    16792198            } else {
    1680                 final_printf("&%d\n", r->dup);
    1681             }
    1682             rnext=r->next;
     2199                debug_printf_clean("&%d\n", r->dup);
     2200            }
     2201            rnext = r->next;
    16832202            free(r);
    16842203        }
    1685         child->redirects=NULL;
     2204        child->redirects = NULL;
    16862205    }
    16872206    free(pi->progs);   /* children are an array, they get freed all at once */
    1688     pi->progs=NULL;
     2207    pi->progs = NULL;
     2208#if ENABLE_HUSH_JOB
     2209    free(pi->cmdtext);
     2210    pi->cmdtext = NULL;
     2211#endif
    16892212    return ret_code;
    16902213}
     
    16922215static int free_pipe_list(struct pipe *head, int indent)
    16932216{
    1694     int rcode=0;   /* if list has no members */
     2217    int rcode = 0;   /* if list has no members */
    16952218    struct pipe *pi, *next;
    1696     char *ind = indenter(indent);
    1697     for (pi=head; pi; pi=next) {
    1698         final_printf("%s pipe reserved mode %d\n", ind, pi->r_mode);
     2219
     2220    for (pi = head; pi; pi = next) {
     2221        debug_printf_clean("%s pipe reserved mode %d\n", indenter(indent), pi->res_word);
    16992222        rcode = free_pipe(pi, indent);
    1700         final_printf("%s pipe followup code %d\n", ind, pi->followup);
    1701         next=pi->next;
    1702         pi->next=NULL;
     2223        debug_printf_clean("%s pipe followup code %d\n", indenter(indent), pi->followup);
     2224        next = pi->next;
     2225        /*pi->next = NULL;*/
    17032226        free(pi);
    17042227    }
     
    17092232static int run_list(struct pipe *pi)
    17102233{
    1711     int rcode=0;
    1712     if (fake_mode==0) {
     2234    int rcode = 0;
     2235    debug_printf_exec("run_list entered\n");
     2236    if (fake_mode == 0) {
     2237        debug_printf_exec(": run_list_real with %d members\n", pi->num_progs);
    17132238        rcode = run_list_real(pi);
    17142239    }
    1715     /* free_pipe_list has the side effect of clearing memory
     2240    /* free_pipe_list has the side effect of clearing memory.
    17162241     * In the long run that function can be merged with run_list_real,
    17172242     * but doing that now would hobble the debugging effort. */
    1718     free_pipe_list(pi,0);
     2243    free_pipe_list(pi, 0);
     2244    debug_printf_exec("run_list return %d\n", rcode);
    17192245    return rcode;
    17202246}
     
    17292255static int globhack(const char *src, int flags, glob_t *pglob)
    17302256{
    1731     int cnt=0, pathc;
     2257    int cnt = 0, pathc;
    17322258    const char *s;
    17332259    char *dest;
    1734     for (cnt=1, s=src; s && *s; s++) {
     2260    for (cnt = 1, s = src; s && *s; s++) {
    17352261        if (*s == '\\') s++;
    17362262        cnt++;
    17372263    }
    1738     dest = malloc(cnt);
    1739     if (!dest) return GLOB_NOSPACE;
     2264    dest = xmalloc(cnt);
    17402265    if (!(flags & GLOB_APPEND)) {
    1741         pglob->gl_pathv=NULL;
    1742         pglob->gl_pathc=0;
    1743         pglob->gl_offs=0;
    1744         pglob->gl_offs=0;
     2266        pglob->gl_pathv = NULL;
     2267        pglob->gl_pathc = 0;
     2268        pglob->gl_offs = 0;
     2269        pglob->gl_offs = 0;
    17452270    }
    17462271    pathc = ++pglob->gl_pathc;
    1747     pglob->gl_pathv = realloc(pglob->gl_pathv, (pathc+1)*sizeof(*pglob->gl_pathv));
    1748     if (pglob->gl_pathv == NULL) return GLOB_NOSPACE;
    1749     pglob->gl_pathv[pathc-1]=dest;
    1750     pglob->gl_pathv[pathc]=NULL;
    1751     for (s=src; s && *s; s++, dest++) {
     2272    pglob->gl_pathv = xrealloc(pglob->gl_pathv, (pathc+1) * sizeof(*pglob->gl_pathv));
     2273    pglob->gl_pathv[pathc-1] = dest;
     2274    pglob->gl_pathv[pathc] = NULL;
     2275    for (s = src; s && *s; s++, dest++) {
    17522276        if (*s == '\\') s++;
    17532277        *dest = *s;
    17542278    }
    1755     *dest='\0';
     2279    *dest = '\0';
    17562280    return 0;
    17572281}
     
    17622286    for (; *s; s++) {
    17632287        if (*s == '\\') s++;
    1764         if (strchr("*[?",*s)) return 1;
     2288        if (strchr("*[?", *s)) return 1;
    17652289    }
    17662290    return 0;
    17672291}
    1768 
    1769 #if 0
    1770 static void globprint(glob_t *pglob)
    1771 {
    1772     int i;
    1773     debug_printf("glob_t at %p:\n", pglob);
    1774     debug_printf("  gl_pathc=%d  gl_pathv=%p  gl_offs=%d  gl_flags=%d\n",
    1775         pglob->gl_pathc, pglob->gl_pathv, pglob->gl_offs, pglob->gl_flags);
    1776     for (i=0; i<pglob->gl_pathc; i++)
    1777         debug_printf("pglob->gl_pathv[%d] = %p = %s\n", i,
    1778             pglob->gl_pathv[i], pglob->gl_pathv[i]);
    1779 }
    1780 #endif
    17812292
    17822293static int xglob(o_string *dest, int flags, glob_t *pglob)
     
    17902301            /* bash man page calls this an "explicit" null */
    17912302            gr = globhack(dest->data, flags, pglob);
    1792             debug_printf("globhack returned %d\n",gr);
     2303            debug_printf("globhack returned %d\n", gr);
    17932304        } else {
    17942305            return 0;
     
    17962307    } else if (glob_needed(dest->data)) {
    17972308        gr = glob(dest->data, flags, NULL, pglob);
    1798         debug_printf("glob returned %d\n",gr);
     2309        debug_printf("glob returned %d\n", gr);
    17992310        if (gr == GLOB_NOMATCH) {
    18002311            /* quote removal, or more accurately, backslash removal */
    18012312            gr = globhack(dest->data, flags, pglob);
    1802             debug_printf("globhack returned %d\n",gr);
     2313            debug_printf("globhack returned %d\n", gr);
    18032314        }
    18042315    } else {
    18052316        gr = globhack(dest->data, flags, pglob);
    1806         debug_printf("globhack returned %d\n",gr);
     2317        debug_printf("globhack returned %d\n", gr);
    18072318    }
    18082319    if (gr == GLOB_NOSPACE)
    18092320        bb_error_msg_and_die("out of memory during glob");
    18102321    if (gr != 0) { /* GLOB_ABORTED ? */
    1811         bb_error_msg("glob(3) error %d",gr);
     2322        bb_error_msg("glob(3) error %d", gr);
    18122323    }
    18132324    /* globprint(glob_target); */
     
    18152326}
    18162327
     2328/* expand_strvec_to_strvec() takes a list of strings, expands
     2329 * all variable references within and returns a pointer to
     2330 * a list of expanded strings, possibly with larger number
     2331 * of strings. (Think VAR="a b"; echo $VAR).
     2332 * This new list is allocated as a single malloc block.
     2333 * NULL-terminated list of char* pointers is at the beginning of it,
     2334 * followed by strings themself.
     2335 * Caller can deallocate entire list by single free(list). */
     2336
     2337/* Helpers first:
     2338 * count_XXX estimates size of the block we need. It's okay
     2339 * to over-estimate sizes a bit, if it makes code simpler */
     2340static int count_ifs(const char *str)
     2341{
     2342    int cnt = 0;
     2343    debug_printf_expand("count_ifs('%s') ifs='%s'", str, ifs);
     2344    while (1) {
     2345        str += strcspn(str, ifs);
     2346        if (!*str) break;
     2347        str++; /* str += strspn(str, ifs); */
     2348        cnt++; /* cnt += strspn(str, ifs); - but this code is larger */
     2349    }
     2350    debug_printf_expand(" return %d\n", cnt);
     2351    return cnt;
     2352}
     2353
     2354static void count_var_expansion_space(int *countp, int *lenp, char *arg)
     2355{
     2356    char first_ch;
     2357    int i;
     2358    int len = *lenp;
     2359    int count = *countp;
     2360    const char *val;
     2361    char *p;
     2362
     2363    while ((p = strchr(arg, SPECIAL_VAR_SYMBOL))) {
     2364        len += p - arg;
     2365        arg = ++p;
     2366        p = strchr(p, SPECIAL_VAR_SYMBOL);
     2367        first_ch = arg[0];
     2368
     2369        switch (first_ch & 0x7f) {
     2370        /* high bit in 1st_ch indicates that var is double-quoted */
     2371        case '$': /* pid */
     2372        case '!': /* bg pid */
     2373        case '?': /* exitcode */
     2374        case '#': /* argc */
     2375            len += sizeof(int)*3 + 1; /* enough for int */
     2376            break;
     2377        case '*':
     2378        case '@':
     2379            for (i = 1; i < global_argc; i++) {
     2380                len += strlen(global_argv[i]) + 1;
     2381                count++;
     2382                if (!(first_ch & 0x80))
     2383                    count += count_ifs(global_argv[i]);
     2384            }
     2385            break;
     2386        default:
     2387            *p = '\0';
     2388            arg[0] = first_ch & 0x7f;
     2389            if (isdigit(arg[0])) {
     2390                i = xatoi_u(arg);
     2391                val = NULL;
     2392                if (i < global_argc)
     2393                    val = global_argv[i];
     2394            } else
     2395                val = lookup_param(arg);
     2396            arg[0] = first_ch;
     2397            *p = SPECIAL_VAR_SYMBOL;
     2398
     2399            if (val) {
     2400                len += strlen(val) + 1;
     2401                if (!(first_ch & 0x80))
     2402                    count += count_ifs(val);
     2403            }
     2404        }
     2405        arg = ++p;
     2406    }
     2407
     2408    len += strlen(arg) + 1;
     2409    count++;
     2410    *lenp = len;
     2411    *countp = count;
     2412}
     2413
     2414/* Store given string, finalizing the word and starting new one whenever
     2415 * we encounter ifs char(s). This is used for expanding variable values.
     2416 * End-of-string does NOT finalize word: think about 'echo -$VAR-' */
     2417static int expand_on_ifs(char **list, int n, char **posp, const char *str)
     2418{
     2419    char *pos = *posp;
     2420    while (1) {
     2421        int word_len = strcspn(str, ifs);
     2422        if (word_len) {
     2423            memcpy(pos, str, word_len); /* store non-ifs chars */
     2424            pos += word_len;
     2425            str += word_len;
     2426        }
     2427        if (!*str)  /* EOL - do not finalize word */
     2428            break;
     2429        *pos++ = '\0';
     2430        if (n) debug_printf_expand("expand_on_ifs finalized list[%d]=%p '%s' "
     2431            "strlen=%d next=%p pos=%p\n", n-1, list[n-1], list[n-1],
     2432            strlen(list[n-1]), list[n-1] + strlen(list[n-1]) + 1, pos);
     2433        list[n++] = pos;
     2434        str += strspn(str, ifs); /* skip ifs chars */
     2435    }
     2436    *posp = pos;
     2437    return n;
     2438}
     2439
     2440/* Expand all variable references in given string, adding words to list[]
     2441 * at n, n+1,... positions. Return updated n (so that list[n] is next one
     2442 * to be filled). This routine is extremely tricky: has to deal with
     2443 * variables/parameters with whitespace, $* and $@, and constructs like
     2444 * 'echo -$*-'. If you play here, you must run testsuite afterwards! */
     2445/* NB: another bug is that we cannot detect empty strings yet:
     2446 * "" or $empty"" expands to zero words, has to expand to empty word */
     2447static int expand_vars_to_list(char **list, int n, char **posp, char *arg, char or_mask)
     2448{
     2449    /* or_mask is either 0 (normal case) or 0x80
     2450     * (expansion of right-hand side of assignment == 1-element expand) */
     2451
     2452    char first_ch, ored_ch;
     2453    int i;
     2454    const char *val;
     2455    char *p;
     2456    char *pos = *posp;
     2457
     2458    ored_ch = 0;
     2459
     2460    if (n) debug_printf_expand("expand_vars_to_list finalized list[%d]=%p '%s' "
     2461        "strlen=%d next=%p pos=%p\n", n-1, list[n-1], list[n-1],
     2462        strlen(list[n-1]), list[n-1] + strlen(list[n-1]) + 1, pos);
     2463    list[n++] = pos;
     2464
     2465    while ((p = strchr(arg, SPECIAL_VAR_SYMBOL))) {
     2466        memcpy(pos, arg, p - arg);
     2467        pos += (p - arg);
     2468        arg = ++p;
     2469        p = strchr(p, SPECIAL_VAR_SYMBOL);
     2470
     2471        first_ch = arg[0] | or_mask; /* forced to "quoted" if or_mask = 0x80 */
     2472        ored_ch |= first_ch;
     2473        val = NULL;
     2474        switch (first_ch & 0x7f) {
     2475        /* Highest bit in first_ch indicates that var is double-quoted */
     2476        case '$': /* pid */
     2477            /* FIXME: (echo $$) should still print pid of main shell */
     2478            val = utoa(getpid());
     2479            break;
     2480        case '!': /* bg pid */
     2481            val = last_bg_pid ? utoa(last_bg_pid) : (char*)"";
     2482            break;
     2483        case '?': /* exitcode */
     2484            val = utoa(last_return_code);
     2485            break;
     2486        case '#': /* argc */
     2487            val = utoa(global_argc ? global_argc-1 : 0);
     2488            break;
     2489        case '*':
     2490        case '@':
     2491            i = 1;
     2492            if (!(first_ch & 0x80)) { /* unquoted $* or $@ */
     2493                while (i < global_argc) {
     2494                    n = expand_on_ifs(list, n, &pos, global_argv[i]);
     2495                    debug_printf_expand("expand_vars_to_list: argv %d (last %d)\n", i, global_argc-1);
     2496                    if (global_argv[i++][0] && i < global_argc) {
     2497                        /* this argv[] is not empty and not last:
     2498                         * put terminating NUL, start new word */
     2499                        *pos++ = '\0';
     2500                        if (n) debug_printf_expand("expand_vars_to_list 2 finalized list[%d]=%p '%s' "
     2501                            "strlen=%d next=%p pos=%p\n", n-1, list[n-1], list[n-1],
     2502                            strlen(list[n-1]), list[n-1] + strlen(list[n-1]) + 1, pos);
     2503                        list[n++] = pos;
     2504                    }
     2505                }
     2506            } else
     2507            /* If or_mask is nonzero, we handle assignment 'a=....$@.....'
     2508             * and in this case should theat it like '$*' */
     2509            if (first_ch == ('@'|0x80) && !or_mask) { /* quoted $@ */
     2510                while (1) {
     2511                    strcpy(pos, global_argv[i]);
     2512                    pos += strlen(global_argv[i]);
     2513                    if (++i >= global_argc)
     2514                        break;
     2515                    *pos++ = '\0';
     2516                    if (n) debug_printf_expand("expand_vars_to_list 3 finalized list[%d]=%p '%s' "
     2517                        "strlen=%d next=%p pos=%p\n", n-1, list[n-1], list[n-1],
     2518                            strlen(list[n-1]), list[n-1] + strlen(list[n-1]) + 1, pos);
     2519                    list[n++] = pos;
     2520                }
     2521            } else { /* quoted $*: add as one word */
     2522                while (1) {
     2523                    strcpy(pos, global_argv[i]);
     2524                    pos += strlen(global_argv[i]);
     2525                    if (++i >= global_argc)
     2526                        break;
     2527                    if (ifs[0])
     2528                        *pos++ = ifs[0];
     2529                }
     2530            }
     2531            break;
     2532        default:
     2533            *p = '\0';
     2534            arg[0] = first_ch & 0x7f;
     2535            if (isdigit(arg[0])) {
     2536                i = xatoi_u(arg);
     2537                val = NULL;
     2538                if (i < global_argc)
     2539                    val = global_argv[i];
     2540            } else
     2541                val = lookup_param(arg);
     2542            arg[0] = first_ch;
     2543            *p = SPECIAL_VAR_SYMBOL;
     2544            if (!(first_ch & 0x80)) { /* unquoted $VAR */
     2545                if (val) {
     2546                    n = expand_on_ifs(list, n, &pos, val);
     2547                    val = NULL;
     2548                }
     2549            } /* else: quoted $VAR, val will be appended at pos */
     2550        }
     2551        if (val) {
     2552            strcpy(pos, val);
     2553            pos += strlen(val);
     2554        }
     2555        arg = ++p;
     2556    }
     2557    debug_printf_expand("expand_vars_to_list adding tail '%s' at %p\n", arg, pos);
     2558    strcpy(pos, arg);
     2559    pos += strlen(arg) + 1;
     2560    if (pos == list[n-1] + 1) { /* expansion is empty */
     2561        if (!(ored_ch & 0x80)) { /* all vars were not quoted... */
     2562            debug_printf_expand("expand_vars_to_list list[%d] empty, going back\n", n);
     2563            pos--;
     2564            n--;
     2565        }
     2566    }
     2567
     2568    *posp = pos;
     2569    return n;
     2570}
     2571
     2572static char **expand_variables(char **argv, char or_mask)
     2573{
     2574    int n;
     2575    int count = 1;
     2576    int len = 0;
     2577    char *pos, **v, **list;
     2578
     2579    v = argv;
     2580    if (!*v) debug_printf_expand("count_var_expansion_space: "
     2581            "argv[0]=NULL count=%d len=%d alloc_space=%d\n",
     2582            count, len, sizeof(char*) * count + len);
     2583    while (*v) {
     2584        count_var_expansion_space(&count, &len, *v);
     2585        debug_printf_expand("count_var_expansion_space: "
     2586            "'%s' count=%d len=%d alloc_space=%d\n",
     2587            *v, count, len, sizeof(char*) * count + len);
     2588        v++;
     2589    }
     2590    len += sizeof(char*) * count; /* total to alloc */
     2591    list = xmalloc(len);
     2592    pos = (char*)(list + count);
     2593    debug_printf_expand("list=%p, list[0] should be %p\n", list, pos);
     2594    n = 0;
     2595    v = argv;
     2596    while (*v)
     2597        n = expand_vars_to_list(list, n, &pos, *v++, or_mask);
     2598
     2599    if (n) debug_printf_expand("finalized list[%d]=%p '%s' "
     2600        "strlen=%d next=%p pos=%p\n", n-1, list[n-1], list[n-1],
     2601        strlen(list[n-1]), list[n-1] + strlen(list[n-1]) + 1, pos);
     2602    list[n] = NULL;
     2603
     2604#ifdef DEBUG_EXPAND
     2605    {
     2606        int m = 0;
     2607        while (m <= n) {
     2608            debug_printf_expand("list[%d]=%p '%s'\n", m, list[m], list[m]);
     2609            m++;
     2610        }
     2611        debug_printf_expand("used_space=%d\n", pos - (char*)list);
     2612    }
     2613#endif
     2614    if (ENABLE_HUSH_DEBUG)
     2615        if (pos - (char*)list > len)
     2616            bb_error_msg_and_die("BUG in varexp");
     2617    return list;
     2618}
     2619
     2620static char **expand_strvec_to_strvec(char **argv)
     2621{
     2622    return expand_variables(argv, 0);
     2623}
     2624
     2625static char *expand_string_to_string(const char *str)
     2626{
     2627    char *argv[2], **list;
     2628
     2629    argv[0] = (char*)str;
     2630    argv[1] = NULL;
     2631    list = expand_variables(argv, 0x80); /* 0x80: make one-element expansion */
     2632    if (ENABLE_HUSH_DEBUG)
     2633        if (!list[0] || list[1])
     2634            bb_error_msg_and_die("BUG in varexp2");
     2635    /* actually, just move string 2*sizeof(char*) bytes back */
     2636    strcpy((char*)list, list[0]);
     2637    debug_printf_expand("string_to_string='%s'\n", (char*)list);
     2638    return (char*)list;
     2639}
     2640
     2641static char* expand_strvec_to_string(char **argv)
     2642{
     2643    char **list;
     2644
     2645    list = expand_variables(argv, 0x80);
     2646    /* Convert all NULs to spaces */
     2647    if (list[0]) {
     2648        int n = 1;
     2649        while (list[n]) {
     2650            if (ENABLE_HUSH_DEBUG)
     2651                if (list[n-1] + strlen(list[n-1]) + 1 != list[n])
     2652                    bb_error_msg_and_die("BUG in varexp3");
     2653            list[n][-1] = ' '; /* TODO: or to ifs[0]? */
     2654            n++;
     2655        }
     2656    }
     2657    strcpy((char*)list, list[0]);
     2658    debug_printf_expand("strvec_to_string='%s'\n", (char*)list);
     2659    return (char*)list;
     2660}
     2661
    18172662/* This is used to get/check local shell variables */
    1818 static char *get_local_var(const char *s)
    1819 {
    1820     struct variables *cur;
    1821 
    1822     if (!s)
     2663static struct variable *get_local_var(const char *name)
     2664{
     2665    struct variable *cur;
     2666    int len;
     2667
     2668    if (!name)
    18232669        return NULL;
    1824     for (cur = top_vars; cur; cur=cur->next)
    1825         if(strcmp(cur->name, s)==0)
    1826             return cur->value;
     2670    len = strlen(name);
     2671    for (cur = top_var; cur; cur = cur->next) {
     2672        if (strncmp(cur->varstr, name, len) == 0 && cur->varstr[len] == '=')
     2673            return cur;
     2674    }
    18272675    return NULL;
    18282676}
    18292677
    1830 /* This is used to set local shell variables
    1831    flg_export==0 if only local (not exporting) variable
    1832    flg_export==1 if "new" exporting environ
    1833    flg_export>1  if current startup environ (not call putenv()) */
    1834 static int set_local_var(const char *s, int flg_export)
    1835 {
    1836     char *name, *value;
    1837     int result=0;
    1838     struct variables *cur;
    1839 
    1840     name=strdup(s);
    1841 
    1842     /* Assume when we enter this function that we are already in
    1843      * NAME=VALUE format.  So the first order of business is to
    1844      * split 's' on the '=' into 'name' and 'value' */
    1845     value = strchr(name, '=');
    1846     if (value==0 && ++value==0) {
    1847         free(name);
     2678/* str holds "NAME=VAL" and is expected to be malloced.
     2679 * We take ownership of it. */
     2680static int set_local_var(char *str, int flg_export)
     2681{
     2682    struct variable *cur;
     2683    char *value;
     2684    int name_len;
     2685
     2686    value = strchr(str, '=');
     2687    if (!value) { /* not expected to ever happen? */
     2688        free(str);
    18482689        return -1;
    18492690    }
    1850     *value++ = 0;
    1851 
    1852     for(cur = top_vars; cur; cur = cur->next) {
    1853         if(strcmp(cur->name, name)==0)
    1854             break;
    1855     }
    1856 
    1857     if(cur) {
    1858         if(strcmp(cur->value, value)==0) {
    1859             if(flg_export>0 && cur->flg_export==0)
    1860                 cur->flg_export=flg_export;
    1861             else
    1862                 result++;
    1863         } else {
    1864             if(cur->flg_read_only) {
    1865                 bb_error_msg("%s: readonly variable", name);
    1866                 result = -1;
    1867             } else {
    1868                 if(flg_export>0 || cur->flg_export>1)
    1869                     cur->flg_export=1;
    1870                 free(cur->value);
    1871 
    1872                 cur->value = strdup(value);
    1873             }
    1874         }
    1875     } else {
    1876         cur = malloc(sizeof(struct variables));
    1877         if(!cur) {
    1878             result = -1;
    1879         } else {
    1880             cur->name = strdup(name);
    1881             if(cur->name == 0) {
    1882                 free(cur);
    1883                 result = -1;
    1884             } else {
    1885                 struct variables *bottom = top_vars;
    1886                 cur->value = strdup(value);
    1887                 cur->next = 0;
    1888                 cur->flg_export = flg_export;
    1889                 cur->flg_read_only = 0;
    1890                 while(bottom->next) bottom=bottom->next;
    1891                 bottom->next = cur;
    1892             }
    1893         }
    1894     }
    1895 
    1896     if(result==0 && cur->flg_export==1) {
    1897         *(value-1) = '=';
    1898         result = putenv(name);
    1899     } else {
    1900         free(name);
    1901         if(result>0)            /* equivalent to previous set */
    1902             result = 0;
    1903     }
    1904     return result;
     2691
     2692    name_len = value - str + 1; /* including '=' */
     2693    cur = top_var; /* cannot be NULL (we have HUSH_VERSION and it's RO) */
     2694    while (1) {
     2695        if (strncmp(cur->varstr, str, name_len) != 0) {
     2696            if (!cur->next) {
     2697                /* Bail out. Note that now cur points
     2698                 * to last var in linked list */
     2699                break;
     2700            }
     2701            cur = cur->next;
     2702            continue;
     2703        }
     2704        /* We found an existing var with this name */
     2705        *value = '\0';
     2706        if (cur->flg_read_only) {
     2707            bb_error_msg("%s: readonly variable", str);
     2708            free(str);
     2709            return -1;
     2710        }
     2711        unsetenv(str); /* just in case */
     2712        *value = '=';
     2713        if (strcmp(cur->varstr, str) == 0) {
     2714 free_and_exp:
     2715            free(str);
     2716            goto exp;
     2717        }
     2718        if (cur->max_len >= strlen(str)) {
     2719            /* This one is from startup env, reuse space */
     2720            strcpy(cur->varstr, str);
     2721            goto free_and_exp;
     2722        }
     2723        /* max_len == 0 signifies "malloced" var, which we can
     2724         * (and has to) free */
     2725        if (!cur->max_len)
     2726            free(cur->varstr);
     2727        cur->max_len = 0;
     2728        goto set_str_and_exp;
     2729    }
     2730
     2731    /* Not found - create next variable struct */
     2732    cur->next = xzalloc(sizeof(*cur));
     2733    cur = cur->next;
     2734
     2735 set_str_and_exp:
     2736    cur->varstr = str;
     2737 exp:
     2738    if (flg_export)
     2739        cur->flg_export = 1;
     2740    if (cur->flg_export)
     2741        return putenv(cur->varstr);
     2742    return 0;
    19052743}
    19062744
    19072745static void unset_local_var(const char *name)
    19082746{
    1909     struct variables *cur;
    1910 
    1911     if (name) {
    1912         for (cur = top_vars; cur; cur=cur->next) {
    1913             if(strcmp(cur->name, name)==0)
    1914                 break;
    1915         }
    1916         if(cur!=0) {
    1917             struct variables *next = top_vars;
    1918             if(cur->flg_read_only) {
     2747    struct variable *cur;
     2748    struct variable *prev = prev; /* for gcc */
     2749    int name_len;
     2750
     2751    if (!name)
     2752        return;
     2753    name_len = strlen(name);
     2754    cur = top_var;
     2755    while (cur) {
     2756        if (strncmp(cur->varstr, name, name_len) == 0 && cur->varstr[name_len] == '=') {
     2757            if (cur->flg_read_only) {
    19192758                bb_error_msg("%s: readonly variable", name);
    19202759                return;
    1921             } else {
    1922                 if(cur->flg_export)
    1923                     unsetenv(cur->name);
    1924                 free(cur->name);
    1925                 free(cur->value);
    1926                 while (next->next != cur)
    1927                     next = next->next;
    1928                 next->next = cur->next;
    1929             }
     2760            }
     2761        /* prev is ok to use here because 1st variable, HUSH_VERSION,
     2762         * is ro, and we cannot reach this code on the 1st pass */
     2763            prev->next = cur->next;
     2764            unsetenv(cur->varstr);
     2765            if (!cur->max_len)
     2766                free(cur->varstr);
    19302767            free(cur);
    1931         }
     2768            return;
     2769        }
     2770        prev = cur;
     2771        cur = cur->next;
    19322772    }
    19332773}
     
    19352775static int is_assignment(const char *s)
    19362776{
    1937     if (s==NULL || !isalpha(*s)) return 0;
    1938     ++s;
    1939     while(isalnum(*s) || *s=='_') ++s;
    1940     return *s=='=';
     2777    if (!s || !isalpha(*s))
     2778        return 0;
     2779    s++;
     2780    while (isalnum(*s) || *s == '_')
     2781        s++;
     2782    return *s == '=';
    19412783}
    19422784
     
    19482790    struct in_str *input)
    19492791{
    1950     struct child_prog *child=ctx->child;
     2792    struct child_prog *child = ctx->child;
    19512793    struct redir_struct *redir = child->redirects;
    1952     struct redir_struct *last_redir=NULL;
     2794    struct redir_struct *last_redir = NULL;
    19532795
    19542796    /* Create a new redir_struct and drop it onto the end of the linked list */
    1955     while(redir) {
    1956         last_redir=redir;
    1957         redir=redir->next;
     2797    while (redir) {
     2798        last_redir = redir;
     2799        redir = redir->next;
    19582800    }
    19592801    redir = xmalloc(sizeof(struct redir_struct));
    1960     redir->next=NULL;
    1961     redir->word.gl_pathv=NULL;
     2802    redir->next = NULL;
     2803    redir->word.gl_pathv = NULL;
    19622804    if (last_redir) {
    1963         last_redir->next=redir;
     2805        last_redir->next = redir;
    19642806    } else {
    1965         child->redirects=redir;
    1966     }
    1967 
    1968     redir->type=style;
    1969     redir->fd= (fd==-1) ? redir_table[style].default_fd : fd ;
     2807        child->redirects = redir;
     2808    }
     2809
     2810    redir->type = style;
     2811    redir->fd = (fd == -1) ? redir_table[style].default_fd : fd;
    19702812
    19712813    debug_printf("Redirect type %d%s\n", redir->fd, redir_table[style].descrip);
     
    19832825         * since we need to return and let src be expanded first.
    19842826         * Set ctx->pending_redirect, so we know what to do at the
    1985          * end of the next parsed word.
    1986          */
     2827         * end of the next parsed word. */
    19872828        ctx->pending_redirect = redir;
    19882829    }
     
    19902831}
    19912832
    1992 static struct pipe *new_pipe(void) {
     2833static struct pipe *new_pipe(void)
     2834{
    19932835    struct pipe *pi;
    1994     pi = xmalloc(sizeof(struct pipe));
    1995     pi->num_progs = 0;
    1996     pi->progs = NULL;
    1997     pi->next = NULL;
    1998     pi->followup = 0;  /* invalid */
    1999     pi->r_mode = RES_NONE;
     2836    pi = xzalloc(sizeof(struct pipe));
     2837    /*pi->num_progs = 0;*/
     2838    /*pi->progs = NULL;*/
     2839    /*pi->next = NULL;*/
     2840    /*pi->followup = 0;  invalid */
     2841    if (RES_NONE)
     2842        pi->res_word = RES_NONE;
    20002843    return pi;
    20012844}
     
    20032846static void initialize_context(struct p_context *ctx)
    20042847{
    2005     ctx->pipe=NULL;
    2006     ctx->pending_redirect=NULL;
    2007     ctx->child=NULL;
    2008     ctx->list_head=new_pipe();
    2009     ctx->pipe=ctx->list_head;
    2010     ctx->w=RES_NONE;
    2011     ctx->stack=NULL;
    2012     ctx->old_flag=0;
     2848    ctx->child = NULL;
     2849    ctx->pipe = ctx->list_head = new_pipe();
     2850    ctx->pending_redirect = NULL;
     2851    ctx->res_w = RES_NONE;
     2852    //only ctx->parse_type is not touched... is this intentional?
     2853    ctx->old_flag = 0;
     2854    ctx->stack = NULL;
    20132855    done_command(ctx);   /* creates the memory for working child */
    20142856}
     
    20192861 * case, function, and select are obnoxious, save those for later.
    20202862 */
     2863#if ENABLE_HUSH_IF || ENABLE_HUSH_LOOPS
    20212864static int reserved_word(o_string *dest, struct p_context *ctx)
    20222865{
    20232866    struct reserved_combo {
    2024         char *literal;
    2025         int code;
    2026         long flag;
     2867        char literal[7];
     2868        unsigned char code;
     2869        int flag;
    20272870    };
    20282871    /* Mostly a list of accepted follow-up reserved words.
     
    20312874     * FLAG_START means the word must start a new compound list.
    20322875     */
    2033     static struct reserved_combo reserved_list[] = {
     2876    static const struct reserved_combo reserved_list[] = {
     2877#if ENABLE_HUSH_IF
    20342878        { "if",    RES_IF,    FLAG_THEN | FLAG_START },
    20352879        { "then",  RES_THEN,  FLAG_ELIF | FLAG_ELSE | FLAG_FI },
     
    20372881        { "else",  RES_ELSE,  FLAG_FI   },
    20382882        { "fi",    RES_FI,    FLAG_END  },
     2883#endif
     2884#if ENABLE_HUSH_LOOPS
    20392885        { "for",   RES_FOR,   FLAG_IN   | FLAG_START },
    20402886        { "while", RES_WHILE, FLAG_DO   | FLAG_START },
     
    20432889        { "do",    RES_DO,    FLAG_DONE },
    20442890        { "done",  RES_DONE,  FLAG_END  }
     2891#endif
    20452892    };
    2046     struct reserved_combo *r;
    2047     for (r=reserved_list;
    2048 #define NRES sizeof(reserved_list)/sizeof(struct reserved_combo)
    2049         r<reserved_list+NRES; r++) {
    2050         if (strcmp(dest->data, r->literal) == 0) {
    2051             debug_printf("found reserved word %s, code %d\n",r->literal,r->code);
    2052             if (r->flag & FLAG_START) {
    2053                 struct p_context *new = xmalloc(sizeof(struct p_context));
    2054                 debug_printf("push stack\n");
    2055                 if (ctx->w == RES_IN || ctx->w == RES_FOR) {
    2056                     syntax();
    2057                     free(new);
    2058                     ctx->w = RES_SNTX;
    2059                     b_reset(dest);
    2060                     return 1;
    2061                 }
    2062                 *new = *ctx;   /* physical copy */
    2063                 initialize_context(ctx);
    2064                 ctx->stack=new;
    2065             } else if ( ctx->w == RES_NONE || ! (ctx->old_flag & (1<<r->code))) {
    2066                 syntax();
    2067                 ctx->w = RES_SNTX;
     2893
     2894    const struct reserved_combo *r;
     2895
     2896    for (r = reserved_list; r < reserved_list + ARRAY_SIZE(reserved_list); r++) {
     2897        if (strcmp(dest->data, r->literal) != 0)
     2898            continue;
     2899        debug_printf("found reserved word %s, code %d\n", r->literal, r->code);
     2900        if (r->flag & FLAG_START) {
     2901            struct p_context *new;
     2902            debug_printf("push stack\n");
     2903#if ENABLE_HUSH_LOOPS
     2904            if (ctx->res_w == RES_IN || ctx->res_w == RES_FOR) {
     2905                syntax("malformed for"); /* example: 'for if' */
     2906                ctx->res_w = RES_SNTX;
    20682907                b_reset(dest);
    20692908                return 1;
    20702909            }
    2071             ctx->w=r->code;
    2072             ctx->old_flag = r->flag;
    2073             if (ctx->old_flag & FLAG_END) {
    2074                 struct p_context *old;
    2075                 debug_printf("pop stack\n");
    2076                 done_pipe(ctx,PIPE_SEQ);
    2077                 old = ctx->stack;
    2078                 old->child->group = ctx->list_head;
    2079                 old->child->subshell = 0;
    2080                 *ctx = *old;   /* physical copy */
    2081                 free(old);
    2082             }
    2083             b_reset (dest);
     2910#endif
     2911            new = xmalloc(sizeof(*new));
     2912            *new = *ctx;   /* physical copy */
     2913            initialize_context(ctx);
     2914            ctx->stack = new;
     2915        } else if (ctx->res_w == RES_NONE || !(ctx->old_flag & (1 << r->code))) {
     2916            syntax(NULL);
     2917            ctx->res_w = RES_SNTX;
     2918            b_reset(dest);
    20842919            return 1;
    20852920        }
     2921        ctx->res_w = r->code;
     2922        ctx->old_flag = r->flag;
     2923        if (ctx->old_flag & FLAG_END) {
     2924            struct p_context *old;
     2925            debug_printf("pop stack\n");
     2926            done_pipe(ctx, PIPE_SEQ);
     2927            old = ctx->stack;
     2928            old->child->group = ctx->list_head;
     2929            old->child->subshell = 0;
     2930            *ctx = *old;   /* physical copy */
     2931            free(old);
     2932        }
     2933        b_reset(dest);
     2934        return 1;
    20862935    }
    20872936    return 0;
    20882937}
    2089 
    2090 /* normal return is 0.
     2938#else
     2939#define reserved_word(dest, ctx) ((int)0)
     2940#endif
     2941
     2942/* Normal return is 0.
    20912943 * Syntax or xglob errors return 1. */
    20922944static int done_word(o_string *dest, struct p_context *ctx)
    20932945{
    2094     struct child_prog *child=ctx->child;
     2946    struct child_prog *child = ctx->child;
    20952947    glob_t *glob_target;
    20962948    int gr, flags = 0;
    20972949
    2098     debug_printf("done_word: %s %p\n", dest->data, child);
     2950    debug_printf_parse("done_word entered: '%s' %p\n", dest->data, child);
    20992951    if (dest->length == 0 && !dest->nonnull) {
    2100         debug_printf(" true null, ignored\n");
     2952        debug_printf_parse("done_word return 0: true null, ignored\n");
    21012953        return 0;
    21022954    }
     
    21052957    } else {
    21062958        if (child->group) {
    2107             syntax();
    2108             return 1;  /* syntax error, groups and arglists don't mix */
    2109         }
    2110         if (!child->argv && (ctx->type & FLAG_PARSE_SEMICOLON)) {
    2111             debug_printf("checking %s for reserved-ness\n",dest->data);
    2112             if (reserved_word(dest,ctx)) return ctx->w==RES_SNTX;
     2959            syntax(NULL);
     2960            debug_printf_parse("done_word return 1: syntax error, groups and arglists don't mix\n");
     2961            return 1;
     2962        }
     2963        if (!child->argv && (ctx->parse_type & PARSEFLAG_SEMICOLON)) {
     2964            debug_printf_parse(": checking '%s' for reserved-ness\n", dest->data);
     2965            if (reserved_word(dest, ctx)) {
     2966                debug_printf_parse("done_word return %d\n", (ctx->res_w == RES_SNTX));
     2967                return (ctx->res_w == RES_SNTX);
     2968            }
    21132969        }
    21142970        glob_target = &child->glob_result;
    2115         if (child->argv) flags |= GLOB_APPEND;
     2971        if (child->argv)
     2972            flags |= GLOB_APPEND;
    21162973    }
    21172974    gr = xglob(dest, flags, glob_target);
    2118     if (gr != 0) return 1;
     2975    if (gr != 0) {
     2976        debug_printf_parse("done_word return 1: xglob returned %d\n", gr);
     2977        return 1;
     2978    }
    21192979
    21202980    b_reset(dest);
    21212981    if (ctx->pending_redirect) {
    2122         ctx->pending_redirect=NULL;
     2982        ctx->pending_redirect = NULL;
    21232983        if (glob_target->gl_pathc != 1) {
    21242984            bb_error_msg("ambiguous redirect");
     2985            debug_printf_parse("done_word return 1: ambiguous redirect\n");
    21252986            return 1;
    21262987        }
     
    21282989        child->argv = glob_target->gl_pathv;
    21292990    }
    2130     if (ctx->w == RES_FOR) {
    2131         done_word(dest,ctx);
    2132         done_pipe(ctx,PIPE_SEQ);
    2133     }
     2991#if ENABLE_HUSH_LOOPS
     2992    if (ctx->res_w == RES_FOR) {
     2993        done_word(dest, ctx);
     2994        done_pipe(ctx, PIPE_SEQ);
     2995    }
     2996#endif
     2997    debug_printf_parse("done_word return 0\n");
    21342998    return 0;
    21352999}
     
    21403004{
    21413005    /* The child is really already in the pipe structure, so
    2142      * advance the pipe counter and make a new, null child.
    2143      * Only real trickiness here is that the uncommitted
    2144      * child structure, to which ctx->child points, is not
    2145      * counted in pi->num_progs. */
    2146     struct pipe *pi=ctx->pipe;
    2147     struct child_prog *prog=ctx->child;
    2148 
    2149     if (prog && prog->group == NULL
    2150              && prog->argv == NULL
    2151              && prog->redirects == NULL) {
    2152         debug_printf("done_command: skipping null command\n");
    2153         return 0;
    2154     } else if (prog) {
     3006     * advance the pipe counter and make a new, null child. */
     3007    struct pipe *pi = ctx->pipe;
     3008    struct child_prog *child = ctx->child;
     3009
     3010    if (child) {
     3011        if (child->group == NULL
     3012         && child->argv == NULL
     3013         && child->redirects == NULL
     3014        ) {
     3015            debug_printf_parse("done_command: skipping null cmd, num_progs=%d\n", pi->num_progs);
     3016            return pi->num_progs;
     3017        }
    21553018        pi->num_progs++;
    2156         debug_printf("done_command: num_progs incremented to %d\n",pi->num_progs);
     3019        debug_printf_parse("done_command: ++num_progs=%d\n", pi->num_progs);
    21573020    } else {
    2158         debug_printf("done_command: initializing\n");
    2159     }
     3021        debug_printf_parse("done_command: initializing, num_progs=%d\n", pi->num_progs);
     3022    }
     3023
     3024    /* Only real trickiness here is that the uncommitted
     3025     * child structure is not counted in pi->num_progs. */
    21603026    pi->progs = xrealloc(pi->progs, sizeof(*pi->progs) * (pi->num_progs+1));
    2161 
    2162     prog = pi->progs + pi->num_progs;
    2163     prog->redirects = NULL;
    2164     prog->argv = NULL;
    2165     prog->is_stopped = 0;
    2166     prog->group = NULL;
    2167     prog->glob_result.gl_pathv = NULL;
    2168     prog->family = pi;
    2169     prog->sp = 0;
    2170     ctx->child = prog;
    2171     prog->type = ctx->type;
    2172 
     3027    child = &pi->progs[pi->num_progs];
     3028
     3029    memset(child, 0, sizeof(*child));
     3030    /*child->redirects = NULL;*/
     3031    /*child->argv = NULL;*/
     3032    /*child->is_stopped = 0;*/
     3033    /*child->group = NULL;*/
     3034    /*child->glob_result.gl_pathv = NULL;*/
     3035    child->family = pi;
     3036    //sp: /*child->sp = 0;*/
     3037    //pt: child->parse_type = ctx->parse_type;
     3038
     3039    ctx->child = child;
    21733040    /* but ctx->pipe and ctx->list_head remain unchanged */
    2174     return 0;
     3041
     3042    return pi->num_progs; /* used only for 0/nonzero check */
    21753043}
    21763044
     
    21783046{
    21793047    struct pipe *new_p;
    2180     done_command(ctx);  /* implicit closure of previous command */
    2181     debug_printf("done_pipe, type %d\n", type);
     3048    int not_null;
     3049
     3050    debug_printf_parse("done_pipe entered, followup %d\n", type);
     3051    not_null = done_command(ctx);  /* implicit closure of previous command */
    21823052    ctx->pipe->followup = type;
    2183     ctx->pipe->r_mode = ctx->w;
    2184     new_p=new_pipe();
    2185     ctx->pipe->next = new_p;
    2186     ctx->pipe = new_p;
    2187     ctx->child = NULL;
    2188     done_command(ctx);  /* set up new pipe to accept commands */
     3053    ctx->pipe->res_word = ctx->res_w;
     3054    /* Without this check, even just <enter> on command line generates
     3055     * tree of three NOPs (!). Which is harmless but annoying.
     3056     * IOW: it is safe to do it unconditionally. */
     3057    if (not_null) {
     3058        new_p = new_pipe();
     3059        ctx->pipe->next = new_p;
     3060        ctx->pipe = new_p;
     3061        ctx->child = NULL;
     3062        done_command(ctx);  /* set up new pipe to accept commands */
     3063    }
     3064    debug_printf_parse("done_pipe return 0\n");
    21893065    return 0;
    21903066}
     
    21963072static int redirect_dup_num(struct in_str *input)
    21973073{
    2198     int ch, d=0, ok=0;
     3074    int ch, d = 0, ok = 0;
    21993075    ch = b_peek(input);
    22003076    if (ch != '&') return -1;
    22013077
    22023078    b_getch(input);  /* get the & */
    2203     ch=b_peek(input);
     3079    ch = b_peek(input);
    22043080    if (ch == '-') {
    22053081        b_getch(input);
     
    22073083    }
    22083084    while (isdigit(ch)) {
    2209         d = d*10+(ch-'0');
    2210         ok=1;
     3085        d = d*10 + (ch-'0');
     3086        ok = 1;
    22113087        b_getch(input);
    22123088        ch = b_peek(input);
     
    22333109    int num;
    22343110
    2235     if (o->length==0) return -1;
    2236     for(num=0; num<o->length; num++) {
    2237         if (!isdigit(*(o->data+num))) {
     3111    if (o->length == 0)
     3112        return -1;
     3113    for (num = 0; num < o->length; num++) {
     3114        if (!isdigit(*(o->data + num))) {
    22383115            return -1;
    22393116        }
    22403117    }
    22413118    /* reuse num (and save an int) */
    2242     num=atoi(o->data);
     3119    num = atoi(o->data);
    22433120    b_reset(o);
    22443121    return num;
    22453122}
    22463123
     3124#if ENABLE_HUSH_TICK
    22473125static FILE *generate_stream_from_list(struct pipe *head)
    22483126{
    22493127    FILE *pf;
    2250 #if 1
    22513128    int pid, channel[2];
    2252     if (pipe(channel)<0) bb_perror_msg_and_die("pipe");
    2253 #if !defined(__UCLIBC__) || defined(__ARCH_HAS_MMU__)
    2254     pid=fork();
     3129
     3130    xpipe(channel);
     3131#if BB_MMU
     3132    pid = fork();
    22553133#else
    2256     pid=vfork();
    2257 #endif
    2258     if (pid<0) {
     3134    pid = vfork();
     3135#endif
     3136    if (pid < 0) {
    22593137        bb_perror_msg_and_die("fork");
    2260     } else if (pid==0) {
     3138    } else if (pid == 0) {
    22613139        close(channel[0]);
    22623140        if (channel[1] != 1) {
    2263             dup2(channel[1],1);
     3141            dup2(channel[1], 1);
    22643142            close(channel[1]);
    22653143        }
    2266 #if 0
    2267 #define SURROGATE "surrogate response"
    2268         write(1,SURROGATE,sizeof(SURROGATE));
    2269         _exit(run_list(head));
    2270 #else
     3144        /* Prevent it from trying to handle ctrl-z etc */
     3145#if ENABLE_HUSH_JOB
     3146        run_list_level = 1;
     3147#endif
     3148        /* Process substitution is not considered to be usual
     3149         * 'command execution'.
     3150         * SUSv3 says ctrl-Z should be ignored, ctrl-C should not. */
     3151        /* Not needed, we are relying on it being disabled
     3152         * everywhere outside actual command execution. */
     3153        /*set_jobctrl_sighandler(SIG_IGN);*/
     3154        set_misc_sighandler(SIG_DFL);
    22713155        _exit(run_list_real(head));   /* leaks memory */
    2272 #endif
    2273     }
    2274     debug_printf("forked child %d\n",pid);
     3156    }
    22753157    close(channel[1]);
    2276     pf = fdopen(channel[0],"r");
    2277     debug_printf("pipe on FILE *%p\n",pf);
    2278 #else
    2279     free_pipe_list(head,0);
    2280     pf=popen("echo surrogate response","r");
    2281     debug_printf("started fake pipe on FILE *%p\n",pf);
    2282 #endif
     3158    pf = fdopen(channel[0], "r");
    22833159    return pf;
    22843160}
    22853161
    2286 /* this version hacked for testing purposes */
    2287 /* return code is exit status of the process that is run. */
    2288 static int process_command_subs(o_string *dest, struct p_context *ctx, struct in_str *input, int subst_end)
    2289 {
    2290     int retcode;
    2291     o_string result=NULL_O_STRING;
     3162/* Return code is exit status of the process that is run. */
     3163static int process_command_subs(o_string *dest, struct p_context *ctx,
     3164    struct in_str *input, const char *subst_end)
     3165{
     3166    int retcode, ch, eol_cnt;
     3167    o_string result = NULL_O_STRING;
    22923168    struct p_context inner;
    22933169    FILE *p;
    22943170    struct in_str pipe_str;
     3171
    22953172    initialize_context(&inner);
    22963173
    22973174    /* recursion to generate command */
    22983175    retcode = parse_stream(&result, &inner, input, subst_end);
    2299     if (retcode != 0) return retcode;  /* syntax error or EOF */
     3176    if (retcode != 0)
     3177        return retcode;  /* syntax error or EOF */
    23003178    done_word(&result, &inner);
    23013179    done_pipe(&inner, PIPE_SEQ);
    23023180    b_free(&result);
    23033181
    2304     p=generate_stream_from_list(inner.list_head);
    2305     if (p==NULL) return 1;
     3182    p = generate_stream_from_list(inner.list_head);
     3183    if (p == NULL) return 1;
    23063184    mark_open(fileno(p));
    23073185    setup_file_in_str(&pipe_str, p);
    23083186
    23093187    /* now send results of command back into original context */
    2310     retcode = parse_stream(dest, ctx, &pipe_str, '\0');
    2311     /* XXX In case of a syntax error, should we try to kill the child?
    2312      * That would be tough to do right, so just read until EOF. */
    2313     if (retcode == 1) {
    2314         while (b_getch(&pipe_str)!=EOF) { /* discard */ };
     3188    eol_cnt = 0;
     3189    while ((ch = b_getch(&pipe_str)) != EOF) {
     3190        if (ch == '\n') {
     3191            eol_cnt++;
     3192            continue;
     3193        }
     3194        while (eol_cnt) {
     3195            b_addqchr(dest, '\n', dest->quote);
     3196            eol_cnt--;
     3197        }
     3198        b_addqchr(dest, ch, dest->quote);
    23153199    }
    23163200
     
    23183202    /* This is the step that wait()s for the child.  Should be pretty
    23193203     * safe, since we just read an EOF from its stdout.  We could try
    2320      * to better, by using wait(), and keeping track of background jobs
     3204     * to do better, by using wait(), and keeping track of background jobs
    23213205     * at the same time.  That would be a lot of work, and contrary
    23223206     * to the KISS philosophy of this program. */
    23233207    mark_closed(fileno(p));
    2324     retcode=pclose(p);
    2325     free_pipe_list(inner.list_head,0);
    2326     debug_printf("pclosed, retcode=%d\n",retcode);
    2327     /* XXX this process fails to trim a single trailing newline */
     3208    retcode = fclose(p);
     3209    free_pipe_list(inner.list_head, 0);
     3210    debug_printf("closed FILE from child, retcode=%d\n", retcode);
    23283211    return retcode;
    23293212}
     3213#endif
    23303214
    23313215static int parse_group(o_string *dest, struct p_context *ctx,
    23323216    struct in_str *input, int ch)
    23333217{
    2334     int rcode, endch=0;
     3218    int rcode;
     3219    const char *endch = NULL;
    23353220    struct p_context sub;
    23363221    struct child_prog *child = ctx->child;
     3222
     3223    debug_printf_parse("parse_group entered\n");
    23373224    if (child->argv) {
    2338         syntax();
    2339         return 1;  /* syntax error, groups and arglists don't mix */
     3225        syntax(NULL);
     3226        debug_printf_parse("parse_group return 1: syntax error, groups and arglists don't mix\n");
     3227        return 1;
    23403228    }
    23413229    initialize_context(&sub);
    2342     switch(ch) {
    2343         case '(': endch=')'; child->subshell=1; break;
    2344         case '{': endch='}'; break;
    2345         default: syntax();   /* really logic error */
    2346     }
    2347     rcode=parse_stream(dest,&sub,input,endch);
    2348     done_word(dest,&sub); /* finish off the final word in the subcontext */
     3230    endch = "}";
     3231    if (ch == '(') {
     3232        endch = ")";
     3233        child->subshell = 1;
     3234    }
     3235    rcode = parse_stream(dest, &sub, input, endch);
     3236//vda: err chk?
     3237    done_word(dest, &sub); /* finish off the final word in the subcontext */
    23493238    done_pipe(&sub, PIPE_SEQ);  /* and the final command there, too */
    23503239    child->group = sub.list_head;
     3240
     3241    debug_printf_parse("parse_group return %d\n", rcode);
    23513242    return rcode;
    23523243    /* child remains "open", available for possible redirects */
    23533244}
    23543245
    2355 /* basically useful version until someone wants to get fancier,
     3246/* Basically useful version until someone wants to get fancier,
    23563247 * see the bash man page under "Parameter Expansion" */
    2357 static char *lookup_param(char *src)
    2358 {
    2359     char *p=NULL;
    2360     if (src) {
    2361         p = getenv(src);
    2362         if (!p)
    2363             p = get_local_var(src);
    2364     }
    2365     return p;
     3248static const char *lookup_param(const char *src)
     3249{
     3250    struct variable *var = get_local_var(src);
     3251    if (var)
     3252        return strchr(var->varstr, '=') + 1;
     3253    return NULL;
    23663254}
    23673255
     
    23693257static int handle_dollar(o_string *dest, struct p_context *ctx, struct in_str *input)
    23703258{
    2371     int i, advance=0;
    2372     char sep[]=" ";
    2373     int ch = input->peek(input);  /* first character after the $ */
    2374     debug_printf("handle_dollar: ch=%c\n",ch);
     3259    int ch = b_peek(input);  /* first character after the $ */
     3260    unsigned char quote_mask = dest->quote ? 0x80 : 0;
     3261
     3262    debug_printf_parse("handle_dollar entered: ch='%c'\n", ch);
    23753263    if (isalpha(ch)) {
    23763264        b_addchr(dest, SPECIAL_VAR_SYMBOL);
    2377         ctx->child->sp++;
    2378         while(ch=b_peek(input),isalnum(ch) || ch=='_') {
     3265        //sp: ctx->child->sp++;
     3266        while (1) {
     3267            debug_printf_parse(": '%c'\n", ch);
    23793268            b_getch(input);
    2380             b_addchr(dest,ch);
     3269            b_addchr(dest, ch | quote_mask);
     3270            quote_mask = 0;
     3271            ch = b_peek(input);
     3272            if (!isalnum(ch) && ch != '_')
     3273                break;
    23813274        }
    23823275        b_addchr(dest, SPECIAL_VAR_SYMBOL);
    23833276    } else if (isdigit(ch)) {
    2384         i = ch-'0';  /* XXX is $0 special? */
    2385         if (i<global_argc) {
    2386             parse_string(dest, ctx, global_argv[i]); /* recursion */
    2387         }
    2388         advance = 1;
     3277 make_one_char_var:
     3278        b_addchr(dest, SPECIAL_VAR_SYMBOL);
     3279        //sp: ctx->child->sp++;
     3280        debug_printf_parse(": '%c'\n", ch);
     3281        b_getch(input);
     3282        b_addchr(dest, ch | quote_mask);
     3283        b_addchr(dest, SPECIAL_VAR_SYMBOL);
    23893284    } else switch (ch) {
    2390         case '$':
    2391             b_adduint(dest,getpid());
    2392             advance = 1;
    2393             break;
    2394         case '!':
    2395             if (last_bg_pid > 0) b_adduint(dest, last_bg_pid);
    2396             advance = 1;
    2397             break;
    2398         case '?':
    2399             b_adduint(dest,last_return_code);
    2400             advance = 1;
    2401             break;
    2402         case '#':
    2403             b_adduint(dest,global_argc ? global_argc-1 : 0);
    2404             advance = 1;
    2405             break;
     3285        case '$': /* pid */
     3286        case '!': /* last bg pid */
     3287        case '?': /* last exit code */
     3288        case '#': /* number of args */
     3289        case '*': /* args */
     3290        case '@': /* args */
     3291            goto make_one_char_var;
    24063292        case '{':
    24073293            b_addchr(dest, SPECIAL_VAR_SYMBOL);
    2408             ctx->child->sp++;
     3294            //sp: ctx->child->sp++;
    24093295            b_getch(input);
    24103296            /* XXX maybe someone will try to escape the '}' */
    2411             while(ch=b_getch(input),ch!=EOF && ch!='}') {
    2412                 b_addchr(dest,ch);
    2413             }
    2414             if (ch != '}') {
    2415                 syntax();
    2416                 return 1;
     3297            while (1) {
     3298                ch = b_getch(input);
     3299                if (ch == '}')
     3300                    break;
     3301                if (!isalnum(ch) && ch != '_') {
     3302                    syntax("unterminated ${name}");
     3303                    debug_printf_parse("handle_dollar return 1: unterminated ${name}\n");
     3304                    return 1;
     3305                }
     3306                debug_printf_parse(": '%c'\n", ch);
     3307                b_addchr(dest, ch | quote_mask);
     3308                quote_mask = 0;
    24173309            }
    24183310            b_addchr(dest, SPECIAL_VAR_SYMBOL);
    24193311            break;
     3312#if ENABLE_HUSH_TICK
    24203313        case '(':
    24213314            b_getch(input);
    2422             process_command_subs(dest, ctx, input, ')');
     3315            process_command_subs(dest, ctx, input, ")");
    24233316            break;
    2424         case '*':
    2425             sep[0]=ifs[0];
    2426             for (i=1; i<global_argc; i++) {
    2427                 parse_string(dest, ctx, global_argv[i]);
    2428                 if (i+1 < global_argc) parse_string(dest, ctx, sep);
    2429             }
    2430             break;
    2431         case '@':
     3317#endif
    24323318        case '-':
    24333319        case '_':
    24343320            /* still unhandled, but should be eventually */
    2435             bb_error_msg("unhandled syntax: $%c",ch);
     3321            bb_error_msg("unhandled syntax: $%c", ch);
    24363322            return 1;
    24373323            break;
    24383324        default:
    2439             b_addqchr(dest,'$',dest->quote);
    2440     }
    2441     /* Eat the character if the flag was set.  If the compiler
    2442      * is smart enough, we could substitute "b_getch(input);"
    2443      * for all the "advance = 1;" above, and also end up with
    2444      * a nice size-optimized program.  Hah!  That'll be the day.
    2445      */
    2446     if (advance) b_getch(input);
     3325            b_addqchr(dest, '$', dest->quote);
     3326    }
     3327    debug_printf_parse("handle_dollar return 0\n");
    24473328    return 0;
    24483329}
    24493330
    2450 int parse_string(o_string *dest, struct p_context *ctx, const char *src)
    2451 {
    2452     struct in_str foo;
    2453     setup_string_in_str(&foo, src);
    2454     return parse_stream(dest, ctx, &foo, '\0');
    2455 }
    2456 
    24573331/* return code is 0 for normal exit, 1 for syntax error */
    2458 int parse_stream(o_string *dest, struct p_context *ctx,
    2459     struct in_str *input, int end_trigger)
     3332static int parse_stream(o_string *dest, struct p_context *ctx,
     3333    struct in_str *input, const char *end_trigger)
    24603334{
    24613335    int ch, m;
     
    24683342     * found.  When recursing, quote state is passed in via dest->quote. */
    24693343
    2470     debug_printf("parse_stream, end_trigger=%d\n",end_trigger);
    2471     while ((ch=b_getch(input))!=EOF) {
    2472         m = map[ch];
    2473         next = (ch == '\n') ? 0 : b_peek(input);
    2474         debug_printf("parse_stream: ch=%c (%d) m=%d quote=%d\n",
    2475             ch,ch,m,dest->quote);
    2476         if (m==0 || ((m==1 || m==2) && dest->quote)) {
     3344    debug_printf_parse("parse_stream entered, end_trigger='%s'\n", end_trigger);
     3345
     3346    while (1) {
     3347        m = CHAR_IFS;
     3348        next = '\0';
     3349        ch = b_getch(input);
     3350        if (ch != EOF) {
     3351            m = charmap[ch];
     3352            if (ch != '\n')
     3353                next = b_peek(input);
     3354        }
     3355        debug_printf_parse(": ch=%c (%d) m=%d quote=%d\n",
     3356                        ch, ch, m, dest->quote);
     3357        if (m == CHAR_ORDINARY
     3358         || (m != CHAR_SPECIAL && dest->quote)
     3359        ) {
     3360            if (ch == EOF) {
     3361                syntax("unterminated \"");
     3362                debug_printf_parse("parse_stream return 1: unterminated \"\n");
     3363                return 1;
     3364            }
    24773365            b_addqchr(dest, ch, dest->quote);
    2478         } else {
    2479             if (m==2) {  /* unquoted IFS */
    2480                 if (done_word(dest, ctx)) {
    2481                     return 1;
    2482                 }
    2483                 /* If we aren't performing a substitution, treat a newline as a
    2484                  * command separator.  */
    2485                 if (end_trigger != '\0' && ch=='\n')
    2486                     done_pipe(ctx,PIPE_SEQ);
    2487             }
    2488             if (ch == end_trigger && !dest->quote && ctx->w==RES_NONE) {
    2489                 debug_printf("leaving parse_stream (triggered)\n");
    2490                 return 0;
    2491             }
    2492 #if 0
    2493             if (ch=='\n') {
    2494                 /* Yahoo!  Time to run with it! */
    2495                 done_pipe(ctx,PIPE_SEQ);
    2496                 run_list(ctx->list_head);
    2497                 initialize_context(ctx);
    2498             }
    2499 #endif
    2500             if (m!=2) switch (ch) {
     3366            continue;
     3367        }
     3368        if (m == CHAR_IFS) {
     3369            if (done_word(dest, ctx)) {
     3370                debug_printf_parse("parse_stream return 1: done_word!=0\n");
     3371                return 1;
     3372            }
     3373            if (ch == EOF)
     3374                break;
     3375            /* If we aren't performing a substitution, treat
     3376             * a newline as a command separator.
     3377             * [why we don't handle it exactly like ';'? --vda] */
     3378            if (end_trigger && ch == '\n') {
     3379                done_pipe(ctx, PIPE_SEQ);
     3380            }
     3381        }
     3382        if ((end_trigger && strchr(end_trigger, ch))
     3383         && !dest->quote && ctx->res_w == RES_NONE
     3384        ) {
     3385            debug_printf_parse("parse_stream return 0: end_trigger char found\n");
     3386            return 0;
     3387        }
     3388        if (m == CHAR_IFS)
     3389            continue;
     3390        switch (ch) {
    25013391        case '#':
    25023392            if (dest->length == 0 && !dest->quote) {
    2503                 while(ch=b_peek(input),ch!=EOF && ch!='\n') { b_getch(input); }
     3393                while (1) {
     3394                    ch = b_peek(input);
     3395                    if (ch == EOF || ch == '\n')
     3396                        break;
     3397                    b_getch(input);
     3398                }
    25043399            } else {
    25053400                b_addqchr(dest, ch, dest->quote);
     
    25083403        case '\\':
    25093404            if (next == EOF) {
    2510                 syntax();
     3405                syntax("\\<eof>");
     3406                debug_printf_parse("parse_stream return 1: \\<eof>\n");
    25113407                return 1;
    25123408            }
     
    25153411            break;
    25163412        case '$':
    2517             if (handle_dollar(dest, ctx, input)!=0) return 1;
     3413            if (handle_dollar(dest, ctx, input) != 0) {
     3414                debug_printf_parse("parse_stream return 1: handle_dollar returned non-0\n");
     3415                return 1;
     3416            }
    25183417            break;
    25193418        case '\'':
    25203419            dest->nonnull = 1;
    2521             while(ch=b_getch(input),ch!=EOF && ch!='\'') {
    2522                 b_addchr(dest,ch);
    2523             }
    2524             if (ch==EOF) {
    2525                 syntax();
     3420            while (1) {
     3421                ch = b_getch(input);
     3422                if (ch == EOF || ch == '\'')
     3423                    break;
     3424                b_addchr(dest, ch);
     3425            }
     3426            if (ch == EOF) {
     3427                syntax("unterminated '");
     3428                debug_printf_parse("parse_stream return 1: unterminated '\n");
    25263429                return 1;
    25273430            }
     
    25313434            dest->quote = !dest->quote;
    25323435            break;
     3436#if ENABLE_HUSH_TICK
    25333437        case '`':
    2534             process_command_subs(dest, ctx, input, '`');
     3438            process_command_subs(dest, ctx, input, "`");
    25353439            break;
     3440#endif
    25363441        case '>':
    25373442            redir_fd = redirect_opt_num(dest);
    25383443            done_word(dest, ctx);
    2539             redir_style=REDIRECT_OVERWRITE;
     3444            redir_style = REDIRECT_OVERWRITE;
    25403445            if (next == '>') {
    2541                 redir_style=REDIRECT_APPEND;
     3446                redir_style = REDIRECT_APPEND;
    25423447                b_getch(input);
    2543             } else if (next == '(') {
    2544                 syntax();   /* until we support >(list) Process Substitution */
     3448            }
     3449#if 0
     3450            else if (next == '(') {
     3451                syntax(">(process) not supported");
     3452                debug_printf_parse("parse_stream return 1: >(process) not supported\n");
    25453453                return 1;
    25463454            }
     3455#endif
    25473456            setup_redirect(ctx, redir_fd, redir_style, input);
    25483457            break;
     
    25503459            redir_fd = redirect_opt_num(dest);
    25513460            done_word(dest, ctx);
    2552             redir_style=REDIRECT_INPUT;
     3461            redir_style = REDIRECT_INPUT;
    25533462            if (next == '<') {
    2554                 redir_style=REDIRECT_HEREIS;
     3463                redir_style = REDIRECT_HEREIS;
    25553464                b_getch(input);
    25563465            } else if (next == '>') {
    2557                 redir_style=REDIRECT_IO;
     3466                redir_style = REDIRECT_IO;
    25583467                b_getch(input);
    2559             } else if (next == '(') {
    2560                 syntax();   /* until we support <(list) Process Substitution */
     3468            }
     3469#if 0
     3470            else if (next == '(') {
     3471                syntax("<(process) not supported");
     3472                debug_printf_parse("parse_stream return 1: <(process) not supported\n");
    25613473                return 1;
    25623474            }
     3475#endif
    25633476            setup_redirect(ctx, redir_fd, redir_style, input);
    25643477            break;
    25653478        case ';':
    25663479            done_word(dest, ctx);
    2567             done_pipe(ctx,PIPE_SEQ);
     3480            done_pipe(ctx, PIPE_SEQ);
    25683481            break;
    25693482        case '&':
    25703483            done_word(dest, ctx);
    2571             if (next=='&') {
     3484            if (next == '&') {
    25723485                b_getch(input);
    2573                 done_pipe(ctx,PIPE_AND);
     3486                done_pipe(ctx, PIPE_AND);
    25743487            } else {
    2575                 done_pipe(ctx,PIPE_BG);
     3488                done_pipe(ctx, PIPE_BG);
    25763489            }
    25773490            break;
    25783491        case '|':
    25793492            done_word(dest, ctx);
    2580             if (next=='|') {
     3493            if (next == '|') {
    25813494                b_getch(input);
    2582                 done_pipe(ctx,PIPE_OR);
     3495                done_pipe(ctx, PIPE_OR);
    25833496            } else {
    25843497                /* we could pick up a file descriptor choice here
     
    25903503        case '(':
    25913504        case '{':
    2592             if (parse_group(dest, ctx, input, ch)!=0) return 1;
     3505            if (parse_group(dest, ctx, input, ch) != 0) {
     3506                debug_printf_parse("parse_stream return 1: parse_group returned non-0\n");
     3507                return 1;
     3508            }
    25933509            break;
    25943510        case ')':
    25953511        case '}':
    2596             syntax();   /* Proper use of this character caught by end_trigger */
     3512            syntax("unexpected }");   /* Proper use of this character is caught by end_trigger */
     3513            debug_printf_parse("parse_stream return 1: unexpected '}'\n");
    25973514            return 1;
    2598             break;
    25993515        default:
    2600             syntax();   /* this is really an internal logic error */
    2601             return 1;
    2602             }
    2603         }
    2604     }
    2605     /* complain if quote?  No, maybe we just finished a command substitution
     3516            if (ENABLE_HUSH_DEBUG)
     3517                bb_error_msg_and_die("BUG: unexpected %c\n", ch);
     3518        }
     3519    }
     3520    /* Complain if quote?  No, maybe we just finished a command substitution
    26063521     * that was quoted.  Example:
    26073522     * $ echo "`cat foo` plus more"
    26083523     * and we just got the EOF generated by the subshell that ran "cat foo"
    2609      * The only real complaint is if we got an EOF when end_trigger != '\0',
     3524     * The only real complaint is if we got an EOF when end_trigger != NULL,
    26103525     * that is, we were really supposed to get end_trigger, and never got
    26113526     * one before the EOF.  Can't use the standard "syntax error" return code,
    26123527     * so that parse_stream_outer can distinguish the EOF and exit smoothly. */
    2613     debug_printf("leaving parse_stream (EOF)\n");
    2614     if (end_trigger != '\0') return -1;
     3528    debug_printf_parse("parse_stream return %d\n", -(end_trigger != NULL));
     3529    if (end_trigger)
     3530        return -1;
    26153531    return 0;
    26163532}
    26173533
    2618 static void mapset(const char *set, int code)
    2619 {
    2620     const unsigned char *s;
    2621     for (s = (const unsigned char *)set; *s; s++) map[(int)*s] = code;
    2622 }
    2623 
    2624 static void update_ifs_map(void)
    2625 {
    2626     /* char *ifs and char map[256] are both globals. */
     3534static void set_in_charmap(const char *set, int code)
     3535{
     3536    while (*set)
     3537        charmap[(unsigned char)*set++] = code;
     3538}
     3539
     3540static void update_charmap(void)
     3541{
     3542    /* char *ifs and char charmap[256] are both globals. */
    26273543    ifs = getenv("IFS");
    2628     if (ifs == NULL) ifs=" \t\n";
     3544    if (ifs == NULL)
     3545        ifs = " \t\n";
    26293546    /* Precompute a list of 'flow through' behavior so it can be treated
    26303547     * quickly up front.  Computation is necessary because of IFS.
    26313548     * Special case handling of IFS == " \t\n" is not implemented.
    2632      * The map[] array only really needs two bits each, and on most machines
    2633      * that would be faster because of the reduced L1 cache footprint.
     3549     * The charmap[] array only really needs two bits each,
     3550     * and on most machines that would be faster (reduced L1 cache use).
    26343551     */
    2635     memset(map,0,sizeof(map)); /* most characters flow through always */
    2636     mapset("\\$'\"`", 3);      /* never flow through */
    2637     mapset("<>;&|(){}#", 1);   /* flow through if quoted */
    2638     mapset(ifs, 2);            /* also flow through if quoted */
     3552    memset(charmap, CHAR_ORDINARY, sizeof(charmap));
     3553#if ENABLE_HUSH_TICK
     3554    set_in_charmap("\\$\"`", CHAR_SPECIAL);
     3555#else
     3556    set_in_charmap("\\$\"", CHAR_SPECIAL);
     3557#endif
     3558    set_in_charmap("<>;&|(){}#'", CHAR_ORDINARY_IF_QUOTED);
     3559    set_in_charmap(ifs, CHAR_IFS);  /* are ordinary if quoted */
    26393560}
    26403561
    26413562/* most recursion does not come through here, the exception is
    2642  * from builtin_source() */
    2643 int parse_stream_outer(struct in_str *inp, int flag)
    2644 {
    2645 
     3563 * from builtin_source() and builtin_eval() */
     3564static int parse_and_run_stream(struct in_str *inp, int parse_flag)
     3565{
    26463566    struct p_context ctx;
    2647     o_string temp=NULL_O_STRING;
     3567    o_string temp = NULL_O_STRING;
    26483568    int rcode;
    26493569    do {
    2650         ctx.type = flag;
     3570        ctx.parse_type = parse_flag;
    26513571        initialize_context(&ctx);
    2652         update_ifs_map();
    2653         if (!(flag & FLAG_PARSE_SEMICOLON) || (flag & FLAG_REPARSING)) mapset(";$&|", 0);
    2654         inp->promptmode=1;
    2655         rcode = parse_stream(&temp, &ctx, inp, '\n');
     3572        update_charmap();
     3573        if (!(parse_flag & PARSEFLAG_SEMICOLON) || (parse_flag & PARSEFLAG_REPARSING))
     3574            set_in_charmap(";$&|", CHAR_ORDINARY);
     3575#if ENABLE_HUSH_INTERACTIVE
     3576        inp->promptmode = 0; /* PS1 */
     3577#endif
     3578        /* We will stop & execute after each ';' or '\n'.
     3579         * Example: "sleep 9999; echo TEST" + ctrl-C:
     3580         * TEST should be printed */
     3581        rcode = parse_stream(&temp, &ctx, inp, ";\n");
    26563582        if (rcode != 1 && ctx.old_flag != 0) {
    2657             syntax();
     3583            syntax(NULL);
    26583584        }
    26593585        if (rcode != 1 && ctx.old_flag == 0) {
    26603586            done_word(&temp, &ctx);
    2661             done_pipe(&ctx,PIPE_SEQ);
     3587            done_pipe(&ctx, PIPE_SEQ);
     3588            debug_print_tree(ctx.list_head, 0);
     3589            debug_printf_exec("parse_stream_outer: run_list\n");
    26623590            run_list(ctx.list_head);
    26633591        } else {
     
    26693597            temp.quote = 0;
    26703598            inp->p = NULL;
    2671             free_pipe_list(ctx.list_head,0);
     3599            free_pipe_list(ctx.list_head, 0);
    26723600        }
    26733601        b_free(&temp);
    2674     } while (rcode != -1 && !(flag & FLAG_EXIT_FROM_LOOP));   /* loop on syntax errors, return on EOF */
     3602    } while (rcode != -1 && !(parse_flag & PARSEFLAG_EXIT_FROM_LOOP));   /* loop on syntax errors, return on EOF */
    26753603    return 0;
    26763604}
    26773605
    2678 static int parse_string_outer(const char *s, int flag)
     3606static int parse_and_run_string(const char *s, int parse_flag)
    26793607{
    26803608    struct in_str input;
    26813609    setup_string_in_str(&input, s);
    2682     return parse_stream_outer(&input, flag);
    2683 }
    2684 
    2685 static int parse_file_outer(FILE *f)
     3610    return parse_and_run_stream(&input, parse_flag);
     3611}
     3612
     3613static int parse_and_run_file(FILE *f)
    26863614{
    26873615    int rcode;
    26883616    struct in_str input;
    26893617    setup_file_in_str(&input, f);
    2690     rcode = parse_stream_outer(&input, FLAG_PARSE_SEMICOLON);
     3618    rcode = parse_and_run_stream(&input, PARSEFLAG_SEMICOLON);
    26913619    return rcode;
    26923620}
    26933621
     3622#if ENABLE_HUSH_JOB
    26943623/* Make sure we have a controlling tty.  If we get started under a job
    26953624 * aware app (like bash for example), make sure we are now in charge so
     
    26973626static void setup_job_control(void)
    26983627{
    2699     static pid_t shell_pgrp;
    2700     /* Loop until we are in the foreground.  */
    2701     while (tcgetpgrp (shell_terminal) != (shell_pgrp = getpgrp ()))
    2702         kill (- shell_pgrp, SIGTTIN);
    2703 
    2704     /* Ignore interactive and job-control signals.  */
    2705     signal(SIGINT, SIG_IGN);
    2706     signal(SIGQUIT, SIG_IGN);
    2707     signal(SIGTERM, SIG_IGN);
    2708     signal(SIGTSTP, SIG_IGN);
    2709     signal(SIGTTIN, SIG_IGN);
    2710     signal(SIGTTOU, SIG_IGN);
    2711     signal(SIGCHLD, SIG_IGN);
     3628    pid_t shell_pgrp;
     3629
     3630    saved_task_pgrp = shell_pgrp = getpgrp();
     3631    debug_printf_jobs("saved_task_pgrp=%d\n", saved_task_pgrp);
     3632    fcntl(interactive_fd, F_SETFD, FD_CLOEXEC);
     3633
     3634    /* If we were ran as 'hush &',
     3635     * sleep until we are in the foreground.  */
     3636    while (tcgetpgrp(interactive_fd) != shell_pgrp) {
     3637        /* Send TTIN to ourself (should stop us) */
     3638        kill(- shell_pgrp, SIGTTIN);
     3639        shell_pgrp = getpgrp();
     3640    }
     3641
     3642    /* Ignore job-control and misc signals.  */
     3643    set_jobctrl_sighandler(SIG_IGN);
     3644    set_misc_sighandler(SIG_IGN);
     3645//huh?  signal(SIGCHLD, SIG_IGN);
     3646
     3647    /* We _must_ restore tty pgrp on fatal signals */
     3648    set_fatal_sighandler(sigexit);
    27123649
    27133650    /* Put ourselves in our own process group.  */
    2714     setsid();
    2715     shell_pgrp = getpid ();
    2716     setpgid (shell_pgrp, shell_pgrp);
    2717 
     3651    setpgrp(); /* is the same as setpgid(our_pid, our_pid); */
    27183652    /* Grab control of the terminal.  */
    2719     tcsetpgrp(shell_terminal, shell_pgrp);
    2720 }
    2721 
     3653    tcsetpgrp(interactive_fd, getpid());
     3654}
     3655#endif
     3656
     3657int hush_main(int argc, char **argv);
    27223658int hush_main(int argc, char **argv)
    27233659{
     3660    static const char version_str[] ALIGN1 = "HUSH_VERSION="HUSH_VER_STR;
     3661    static const struct variable const_shell_ver = {
     3662        .next = NULL,
     3663        .varstr = (char*)version_str,
     3664        .max_len = 1, /* 0 can provoke free(name) */
     3665        .flg_export = 1,
     3666        .flg_read_only = 1,
     3667    };
     3668
    27243669    int opt;
    27253670    FILE *input;
    2726     char **e = environ;
    2727 
     3671    char **e;
     3672    struct variable *cur_var;
     3673
     3674    PTR_TO_GLOBALS = xzalloc(sizeof(G));
     3675
     3676    /* Deal with HUSH_VERSION */
     3677    shell_ver = const_shell_ver; /* copying struct here */
     3678    top_var = &shell_ver;
     3679    unsetenv("HUSH_VERSION"); /* in case it exists in initial env */
     3680    /* Initialize our shell local variables with the values
     3681     * currently living in the environment */
     3682    cur_var = top_var;
     3683    e = environ;
     3684    if (e) while (*e) {
     3685        char *value = strchr(*e, '=');
     3686        if (value) { /* paranoia */
     3687            cur_var->next = xzalloc(sizeof(*cur_var));
     3688            cur_var = cur_var->next;
     3689            cur_var->varstr = *e;
     3690            cur_var->max_len = strlen(*e);
     3691            cur_var->flg_export = 1;
     3692        }
     3693        e++;
     3694    }
     3695    putenv((char *)version_str); /* reinstate HUSH_VERSION */
     3696
     3697#if ENABLE_FEATURE_EDITING
     3698    line_input_state = new_line_input_t(FOR_SHELL);
     3699#endif
    27283700    /* XXX what should these be while sourcing /etc/profile? */
    27293701    global_argc = argc;
    27303702    global_argv = argv;
    2731 
    2732     /* (re?) initialize globals.  Sometimes hush_main() ends up calling
    2733      * hush_main(), therefore we cannot rely on the BSS to zero out this
    2734      * stuff.  Reset these to 0 every time. */
    2735     ifs = NULL;
    2736     /* map[] is taken care of with call to update_ifs_map() */
    2737     fake_mode = 0;
    2738     interactive = 0;
    2739     close_me_head = NULL;
    2740     last_bg_pid = 0;
    2741     job_list = NULL;
    2742     last_jobid = 0;
    2743 
    27443703    /* Initialize some more globals to non-zero values */
    27453704    set_cwd();
    2746 #ifdef CONFIG_FEATURE_COMMAND_EDITING
     3705#if ENABLE_HUSH_INTERACTIVE
     3706#if ENABLE_FEATURE_EDITING
    27473707    cmdedit_set_initial_prompt();
    2748 #else
    2749     PS1 = NULL;
    27503708#endif
    27513709    PS2 = "> ";
    2752 
    2753     /* initialize our shell local variables with the values
    2754      * currently living in the environment */
    2755     if (e) {
    2756         for (; *e; e++)
    2757             set_local_var(*e, 2);   /* without call putenv() */
    2758     }
    2759 
    2760     last_return_code=EXIT_SUCCESS;
    2761 
     3710#endif
     3711
     3712    if (EXIT_SUCCESS) /* otherwise is already done */
     3713        last_return_code = EXIT_SUCCESS;
    27623714
    27633715    if (argv[0] && argv[0][0] == '-') {
    2764         debug_printf("\nsourcing /etc/profile\n");
    2765         if ((input = fopen("/etc/profile", "r")) != NULL) {
     3716        debug_printf("sourcing /etc/profile\n");
     3717        input = fopen("/etc/profile", "r");
     3718        if (input != NULL) {
    27663719            mark_open(fileno(input));
    2767             parse_file_outer(input);
     3720            parse_and_run_file(input);
    27683721            mark_closed(fileno(input));
    27693722            fclose(input);
    27703723        }
    27713724    }
    2772     input=stdin;
     3725    input = stdin;
    27733726
    27743727    while ((opt = getopt(argc, argv, "c:xif")) > 0) {
    27753728        switch (opt) {
    2776             case 'c':
    2777                 {
    2778                     global_argv = argv+optind;
    2779                     global_argc = argc-optind;
    2780                     opt = parse_string_outer(optarg, FLAG_PARSE_SEMICOLON);
    2781                     goto final_return;
    2782                 }
    2783                 break;
    2784             case 'i':
    2785                 interactive++;
    2786                 break;
    2787             case 'f':
    2788                 fake_mode++;
    2789                 break;
    2790             default:
     3729        case 'c':
     3730            global_argv = argv + optind;
     3731            global_argc = argc - optind;
     3732            opt = parse_and_run_string(optarg, PARSEFLAG_SEMICOLON);
     3733            goto final_return;
     3734        case 'i':
     3735            /* Well, we cannot just declare interactiveness,
     3736             * we have to have some stuff (ctty, etc) */
     3737            /* interactive_fd++; */
     3738            break;
     3739        case 'f':
     3740            fake_mode = 1;
     3741            break;
     3742        default:
    27913743#ifndef BB_VER
    2792                 fprintf(stderr, "Usage: sh [FILE]...\n"
    2793                         "   or: sh -c command [args]...\n\n");
    2794                 exit(EXIT_FAILURE);
     3744            fprintf(stderr, "Usage: sh [FILE]...\n"
     3745                    "   or: sh -c command [args]...\n\n");
     3746            exit(EXIT_FAILURE);
    27953747#else
    2796                 bb_show_usage();
    2797 #endif
    2798         }
    2799     }
    2800     /* A shell is interactive if the `-i' flag was given, or if all of
     3748            bb_show_usage();
     3749#endif
     3750        }
     3751    }
     3752#if ENABLE_HUSH_JOB
     3753    /* A shell is interactive if the '-i' flag was given, or if all of
    28013754     * the following conditions are met:
    2802      *    no -c command
     3755     *    no -c command
    28033756     *    no arguments remaining or the -s flag given
    28043757     *    standard input is a terminal
    28053758     *    standard output is a terminal
    2806      *    Refer to Posix.2, the description of the `sh' utility. */
    2807     if (argv[optind]==NULL && input==stdin &&
    2808             isatty(STDIN_FILENO) && isatty(STDOUT_FILENO)) {
    2809         interactive++;
    2810     }
    2811 
    2812     debug_printf("\ninteractive=%d\n", interactive);
    2813     if (interactive) {
     3759     *    Refer to Posix.2, the description of the 'sh' utility. */
     3760    if (argv[optind] == NULL && input == stdin
     3761     && isatty(STDIN_FILENO) && isatty(STDOUT_FILENO)
     3762    ) {
     3763        saved_tty_pgrp = tcgetpgrp(STDIN_FILENO);
     3764        debug_printf("saved_tty_pgrp=%d\n", saved_tty_pgrp);
     3765        if (saved_tty_pgrp >= 0) {
     3766            /* try to dup to high fd#, >= 255 */
     3767            interactive_fd = fcntl(STDIN_FILENO, F_DUPFD, 255);
     3768            if (interactive_fd < 0) {
     3769                /* try to dup to any fd */
     3770                interactive_fd = dup(STDIN_FILENO);
     3771                if (interactive_fd < 0)
     3772                    /* give up */
     3773                    interactive_fd = 0;
     3774            }
     3775            // TODO: track & disallow any attempts of user
     3776            // to (inadvertently) close/redirect it
     3777        }
     3778    }
     3779    debug_printf("interactive_fd=%d\n", interactive_fd);
     3780    if (interactive_fd) {
    28143781        /* Looks like they want an interactive shell */
    2815 #ifndef CONFIG_FEATURE_SH_EXTRA_QUIET
    2816         printf( "\n\n%s hush - the humble shell v0.01 (testing)\n",
    2817             BB_BANNER);
    2818         printf( "Enter 'help' for a list of built-in commands.\n\n");
    2819 #endif
    28203782        setup_job_control();
    2821     }
    2822 
    2823     if (argv[optind]==NULL) {
    2824         opt=parse_file_outer(stdin);
     3783        /* Make xfuncs do cleanup on exit */
     3784        die_sleep = -1; /* flag */
     3785// FIXME: should we reset die_sleep = 0 whereever we fork?
     3786        if (setjmp(die_jmp)) {
     3787            /* xfunc has failed! die die die */
     3788            hush_exit(xfunc_error_retval);
     3789        }
     3790#if !ENABLE_FEATURE_SH_EXTRA_QUIET
     3791        printf("\n\n%s hush - the humble shell v"HUSH_VER_STR"\n", bb_banner);
     3792        printf("Enter 'help' for a list of built-in commands.\n\n");
     3793#endif
     3794    }
     3795#elif ENABLE_HUSH_INTERACTIVE
     3796/* no job control compiled, only prompt/line editing */
     3797    if (argv[optind] == NULL && input == stdin
     3798     && isatty(STDIN_FILENO) && isatty(STDOUT_FILENO)
     3799    ) {
     3800        interactive_fd = fcntl(STDIN_FILENO, F_DUPFD, 255);
     3801        if (interactive_fd < 0) {
     3802            /* try to dup to any fd */
     3803            interactive_fd = dup(STDIN_FILENO);
     3804            if (interactive_fd < 0)
     3805                /* give up */
     3806                interactive_fd = 0;
     3807        }
     3808    }
     3809
     3810#endif
     3811
     3812    if (argv[optind] == NULL) {
     3813        opt = parse_and_run_file(stdin);
    28253814        goto final_return;
    28263815    }
    28273816
    28283817    debug_printf("\nrunning script '%s'\n", argv[optind]);
    2829     global_argv = argv+optind;
    2830     global_argc = argc-optind;
    2831     input = bb_xfopen(argv[optind], "r");
    2832     opt = parse_file_outer(input);
    2833 
    2834 #ifdef CONFIG_FEATURE_CLEAN_UP
     3818    global_argv = argv + optind;
     3819    global_argc = argc - optind;
     3820    input = xfopen(argv[optind], "r");
     3821    opt = parse_and_run_file(input);
     3822
     3823 final_return:
     3824
     3825#if ENABLE_FEATURE_CLEAN_UP
    28353826    fclose(input);
    2836     if (cwd && cwd != bb_msg_unknown)
     3827    if (cwd != bb_msg_unknown)
    28373828        free((char*)cwd);
    2838     {
    2839         struct variables *cur, *tmp;
    2840         for(cur = top_vars; cur; cur = tmp) {
    2841             tmp = cur->next;
    2842             if (!cur->flg_read_only) {
    2843                 free(cur->name);
    2844                 free(cur->value);
    2845                 free(cur);
    2846             }
    2847         }
    2848     }
    2849 #endif
    2850 
    2851 final_return:
    2852     return(opt?opt:last_return_code);
    2853 }
    2854 
    2855 static char *insert_var_value(char *inp)
    2856 {
    2857     int res_str_len = 0;
    2858     int len;
    2859     int done = 0;
    2860     char *p, *p1, *res_str = NULL;
    2861 
    2862     while ((p = strchr(inp, SPECIAL_VAR_SYMBOL))) {
    2863         if (p != inp) {
    2864             len = p - inp;
    2865             res_str = xrealloc(res_str, (res_str_len + len));
    2866             strncpy((res_str + res_str_len), inp, len);
    2867             res_str_len += len;
    2868         }
    2869         inp = ++p;
    2870         p = strchr(inp, SPECIAL_VAR_SYMBOL);
    2871         *p = '\0';
    2872         if ((p1 = lookup_param(inp))) {
    2873             len = res_str_len + strlen(p1);
    2874             res_str = xrealloc(res_str, (1 + len));
    2875             strcpy((res_str + res_str_len), p1);
    2876             res_str_len = len;
    2877         }
    2878         *p = SPECIAL_VAR_SYMBOL;
    2879         inp = ++p;
    2880         done = 1;
    2881     }
    2882     if (done) {
    2883         res_str = xrealloc(res_str, (1 + res_str_len + strlen(inp)));
    2884         strcpy((res_str + res_str_len), inp);
    2885         while ((p = strchr(res_str, '\n'))) {
    2886             *p = ' ';
    2887         }
    2888     }
    2889     return (res_str == NULL) ? inp : res_str;
    2890 }
    2891 
    2892 static char **make_list_in(char **inp, char *name)
    2893 {
    2894     int len, i;
    2895     int name_len = strlen(name);
    2896     int n = 0;
    2897     char **list;
    2898     char *p1, *p2, *p3;
    2899 
    2900     /* create list of variable values */
    2901     list = xmalloc(sizeof(*list));
    2902     for (i = 0; inp[i]; i++) {
    2903         p3 = insert_var_value(inp[i]);
    2904         p1 = p3;
    2905         while (*p1) {
    2906             if ((*p1 == ' ')) {
    2907                 p1++;
    2908                 continue;
    2909             }
    2910             if ((p2 = strchr(p1, ' '))) {
    2911                 len = p2 - p1;
    2912             } else {
    2913                 len = strlen(p1);
    2914                 p2 = p1 + len;
    2915             }
    2916             /* we use n + 2 in realloc for list,because we add
    2917              * new element and then we will add NULL element */
    2918             list = xrealloc(list, sizeof(*list) * (n + 2));
    2919             list[n] = xmalloc(2 + name_len + len);
    2920             strcpy(list[n], name);
    2921             strcat(list[n], "=");
    2922             strncat(list[n], p1, len);
    2923             list[n++][name_len + len + 1] = '\0';
    2924             p1 = p2;
    2925         }
    2926         if (p3 != inp[i]) free(p3);
    2927     }
    2928     list[n] = NULL;
    2929     return list;
    2930 }
    2931 
    2932 /* Make new string for parser */
    2933 static char * make_string(char ** inp)
    2934 {
    2935     char *p;
    2936     char *str = NULL;
    2937     int n;
    2938     int len = 2;
    2939 
    2940     for (n = 0; inp[n]; n++) {
    2941         p = insert_var_value(inp[n]);
    2942         str = xrealloc(str, (len + strlen(p)));
    2943         if (n) {
    2944             strcat(str, " ");
    2945         } else {
    2946             *str = '\0';
    2947         }
    2948         strcat(str, p);
    2949         len = strlen(str) + 3;
    2950         if (p != inp[n]) free(p);
    2951     }
    2952     len = strlen(str);
    2953     *(str + len) = '\n';
    2954     *(str + len + 1) = '\0';
    2955     return str;
    2956 }
     3829    cur_var = top_var->next;
     3830    while (cur_var) {
     3831        struct variable *tmp = cur_var;
     3832        if (!cur_var->max_len)
     3833            free(cur_var->varstr);
     3834        cur_var = cur_var->next;
     3835        free(tmp);
     3836    }
     3837#endif
     3838    hush_exit(opt ? opt : last_return_code);
     3839}
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