[821] | 1 | /* vi: set sw=4 ts=4: */
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| 2 | /*
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| 3 | * sh.c -- a prototype Bourne shell grammar parser
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| 4 | * Intended to follow the original Thompson and Ritchie
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| 5 | * "small and simple is beautiful" philosophy, which
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| 6 | * incidentally is a good match to today's BusyBox.
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| 7 | *
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| 8 | * Copyright (C) 2000,2001 Larry Doolittle <larry@doolittle.boa.org>
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| 9 | *
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| 10 | * Credits:
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| 11 | * The parser routines proper are all original material, first
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| 12 | * written Dec 2000 and Jan 2001 by Larry Doolittle. The
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| 13 | * execution engine, the builtins, and much of the underlying
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| 14 | * support has been adapted from busybox-0.49pre's lash, which is
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| 15 | * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
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| 16 | * written by Erik Andersen <andersen@codepoet.org>. That, in turn,
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| 17 | * is based in part on ladsh.c, by Michael K. Johnson and Erik W.
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| 18 | * Troan, which they placed in the public domain. I don't know
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| 19 | * how much of the Johnson/Troan code has survived the repeated
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| 20 | * rewrites.
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| 21 | *
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| 22 | * Other credits:
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| 23 | * simple_itoa() was lifted from boa-0.93.15
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| 24 | * b_addchr() derived from similar w_addchar function in glibc-2.2
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| 25 | * setup_redirect(), redirect_opt_num(), and big chunks of main()
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| 26 | * and many builtins derived from contributions by Erik Andersen
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| 27 | * miscellaneous bugfixes from Matt Kraai
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| 28 | *
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| 29 | * There are two big (and related) architecture differences between
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| 30 | * this parser and the lash parser. One is that this version is
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| 31 | * actually designed from the ground up to understand nearly all
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| 32 | * of the Bourne grammar. The second, consequential change is that
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| 33 | * the parser and input reader have been turned inside out. Now,
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| 34 | * the parser is in control, and asks for input as needed. The old
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| 35 | * way had the input reader in control, and it asked for parsing to
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| 36 | * take place as needed. The new way makes it much easier to properly
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| 37 | * handle the recursion implicit in the various substitutions, especially
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| 38 | * across continuation lines.
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| 39 | *
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| 40 | * Bash grammar not implemented: (how many of these were in original sh?)
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| 41 | * $@ (those sure look like weird quoting rules)
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| 42 | * $_
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| 43 | * ! negation operator for pipes
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| 44 | * &> and >& redirection of stdout+stderr
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| 45 | * Brace Expansion
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| 46 | * Tilde Expansion
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| 47 | * fancy forms of Parameter Expansion
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| 48 | * aliases
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| 49 | * Arithmetic Expansion
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| 50 | * <(list) and >(list) Process Substitution
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| 51 | * reserved words: case, esac, select, function
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| 52 | * Here Documents ( << word )
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| 53 | * Functions
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| 54 | * Major bugs:
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| 55 | * job handling woefully incomplete and buggy
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| 56 | * reserved word execution woefully incomplete and buggy
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| 57 | * to-do:
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| 58 | * port selected bugfixes from post-0.49 busybox lash - done?
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| 59 | * finish implementing reserved words: for, while, until, do, done
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| 60 | * change { and } from special chars to reserved words
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| 61 | * builtins: break, continue, eval, return, set, trap, ulimit
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| 62 | * test magic exec
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| 63 | * handle children going into background
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| 64 | * clean up recognition of null pipes
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| 65 | * check setting of global_argc and global_argv
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| 66 | * control-C handling, probably with longjmp
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| 67 | * follow IFS rules more precisely, including update semantics
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| 68 | * figure out what to do with backslash-newline
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| 69 | * explain why we use signal instead of sigaction
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| 70 | * propagate syntax errors, die on resource errors?
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| 71 | * continuation lines, both explicit and implicit - done?
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| 72 | * memory leak finding and plugging - done?
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| 73 | * more testing, especially quoting rules and redirection
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| 74 | * document how quoting rules not precisely followed for variable assignments
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| 75 | * maybe change map[] to use 2-bit entries
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| 76 | * (eventually) remove all the printf's
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| 77 | *
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| 78 | * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
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| 79 | */
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| 80 |
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| 81 | #include "busybox.h"
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| 82 | #include <ctype.h> /* isalpha, isdigit */
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| 83 | #include <unistd.h> /* getpid */
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| 84 | #include <stdlib.h> /* getenv, atoi */
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| 85 | #include <string.h> /* strchr */
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| 86 | #include <stdio.h> /* popen etc. */
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| 87 | #include <glob.h> /* glob, of course */
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| 88 | #include <stdarg.h> /* va_list */
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| 89 | #include <errno.h>
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| 90 | #include <fcntl.h>
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| 91 | #include <getopt.h> /* should be pretty obvious */
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| 92 |
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| 93 | #include <sys/stat.h> /* ulimit */
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| 94 | #include <sys/types.h>
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| 95 | #include <sys/wait.h>
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| 96 | #include <signal.h>
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| 97 |
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| 98 | /* #include <dmalloc.h> */
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| 99 | /* #define DEBUG_SHELL */
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| 100 |
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| 101 | #if 1
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| 102 | #include "cmdedit.h"
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| 103 | #else
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| 104 | #define bb_applet_name "hush"
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| 105 | //#include "standalone.h"
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| 106 | #define hush_main main
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| 107 | #undef CONFIG_FEATURE_SH_FANCY_PROMPT
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| 108 | #define BB_BANNER ""
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| 109 | #endif
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| 110 | #define SPECIAL_VAR_SYMBOL 03
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| 111 | #define FLAG_EXIT_FROM_LOOP 1
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| 112 | #define FLAG_PARSE_SEMICOLON (1 << 1) /* symbol ';' is special for parser */
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| 113 | #define FLAG_REPARSING (1 << 2) /* >=2nd pass */
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| 114 |
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| 115 | typedef enum {
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| 116 | REDIRECT_INPUT = 1,
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| 117 | REDIRECT_OVERWRITE = 2,
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| 118 | REDIRECT_APPEND = 3,
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| 119 | REDIRECT_HEREIS = 4,
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| 120 | REDIRECT_IO = 5
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| 121 | } redir_type;
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| 122 |
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| 123 | /* The descrip member of this structure is only used to make debugging
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| 124 | * output pretty */
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| 125 | static const struct {int mode; int default_fd; const char *descrip;} redir_table[] = {
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| 126 | { 0, 0, "()" },
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| 127 | { O_RDONLY, 0, "<" },
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| 128 | { O_CREAT|O_TRUNC|O_WRONLY, 1, ">" },
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| 129 | { O_CREAT|O_APPEND|O_WRONLY, 1, ">>" },
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| 130 | { O_RDONLY, -1, "<<" },
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| 131 | { O_RDWR, 1, "<>" }
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| 132 | };
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| 133 |
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| 134 | typedef enum {
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| 135 | PIPE_SEQ = 1,
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| 136 | PIPE_AND = 2,
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| 137 | PIPE_OR = 3,
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| 138 | PIPE_BG = 4,
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| 139 | } pipe_style;
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| 140 |
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| 141 | /* might eventually control execution */
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| 142 | typedef enum {
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| 143 | RES_NONE = 0,
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| 144 | RES_IF = 1,
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| 145 | RES_THEN = 2,
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| 146 | RES_ELIF = 3,
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| 147 | RES_ELSE = 4,
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| 148 | RES_FI = 5,
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| 149 | RES_FOR = 6,
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| 150 | RES_WHILE = 7,
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| 151 | RES_UNTIL = 8,
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| 152 | RES_DO = 9,
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| 153 | RES_DONE = 10,
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| 154 | RES_XXXX = 11,
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| 155 | RES_IN = 12,
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| 156 | RES_SNTX = 13
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| 157 | } reserved_style;
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| 158 | #define FLAG_END (1<<RES_NONE)
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| 159 | #define FLAG_IF (1<<RES_IF)
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| 160 | #define FLAG_THEN (1<<RES_THEN)
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| 161 | #define FLAG_ELIF (1<<RES_ELIF)
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| 162 | #define FLAG_ELSE (1<<RES_ELSE)
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| 163 | #define FLAG_FI (1<<RES_FI)
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| 164 | #define FLAG_FOR (1<<RES_FOR)
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| 165 | #define FLAG_WHILE (1<<RES_WHILE)
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| 166 | #define FLAG_UNTIL (1<<RES_UNTIL)
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| 167 | #define FLAG_DO (1<<RES_DO)
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| 168 | #define FLAG_DONE (1<<RES_DONE)
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| 169 | #define FLAG_IN (1<<RES_IN)
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| 170 | #define FLAG_START (1<<RES_XXXX)
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| 171 |
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| 172 | /* This holds pointers to the various results of parsing */
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| 173 | struct p_context {
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| 174 | struct child_prog *child;
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| 175 | struct pipe *list_head;
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| 176 | struct pipe *pipe;
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| 177 | struct redir_struct *pending_redirect;
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| 178 | reserved_style w;
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| 179 | int old_flag; /* for figuring out valid reserved words */
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| 180 | struct p_context *stack;
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| 181 | int type; /* define type of parser : ";$" common or special symbol */
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| 182 | /* How about quoting status? */
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| 183 | };
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| 184 |
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| 185 | struct redir_struct {
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| 186 | redir_type type; /* type of redirection */
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| 187 | int fd; /* file descriptor being redirected */
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| 188 | int dup; /* -1, or file descriptor being duplicated */
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| 189 | struct redir_struct *next; /* pointer to the next redirect in the list */
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| 190 | glob_t word; /* *word.gl_pathv is the filename */
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| 191 | };
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| 192 |
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| 193 | struct child_prog {
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| 194 | pid_t pid; /* 0 if exited */
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| 195 | char **argv; /* program name and arguments */
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| 196 | struct pipe *group; /* if non-NULL, first in group or subshell */
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| 197 | int subshell; /* flag, non-zero if group must be forked */
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| 198 | struct redir_struct *redirects; /* I/O redirections */
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| 199 | glob_t glob_result; /* result of parameter globbing */
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| 200 | int is_stopped; /* is the program currently running? */
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| 201 | struct pipe *family; /* pointer back to the child's parent pipe */
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| 202 | int sp; /* number of SPECIAL_VAR_SYMBOL */
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| 203 | int type;
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| 204 | };
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| 205 |
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| 206 | struct pipe {
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| 207 | int jobid; /* job number */
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| 208 | int num_progs; /* total number of programs in job */
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| 209 | int running_progs; /* number of programs running */
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| 210 | char *text; /* name of job */
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| 211 | char *cmdbuf; /* buffer various argv's point into */
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| 212 | pid_t pgrp; /* process group ID for the job */
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| 213 | struct child_prog *progs; /* array of commands in pipe */
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| 214 | struct pipe *next; /* to track background commands */
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| 215 | int stopped_progs; /* number of programs alive, but stopped */
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| 216 | int job_context; /* bitmask defining current context */
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| 217 | pipe_style followup; /* PIPE_BG, PIPE_SEQ, PIPE_OR, PIPE_AND */
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| 218 | reserved_style r_mode; /* supports if, for, while, until */
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| 219 | };
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| 220 |
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| 221 | struct close_me {
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| 222 | int fd;
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| 223 | struct close_me *next;
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| 224 | };
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| 225 |
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| 226 | struct variables {
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| 227 | char *name;
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| 228 | char *value;
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| 229 | int flg_export;
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| 230 | int flg_read_only;
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| 231 | struct variables *next;
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| 232 | };
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| 233 |
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| 234 | /* globals, connect us to the outside world
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| 235 | * the first three support $?, $#, and $1 */
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| 236 | static char **global_argv;
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| 237 | static int global_argc;
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| 238 | static int last_return_code;
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| 239 | extern char **environ; /* This is in <unistd.h>, but protected with __USE_GNU */
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| 240 |
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| 241 | /* "globals" within this file */
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| 242 | static char *ifs;
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| 243 | static unsigned char map[256];
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| 244 | static int fake_mode;
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| 245 | static int interactive;
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| 246 | static struct close_me *close_me_head;
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| 247 | static const char *cwd;
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| 248 | static struct pipe *job_list;
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| 249 | static unsigned int last_bg_pid;
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| 250 | static int last_jobid;
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| 251 | static unsigned int shell_terminal;
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| 252 | static char *PS1;
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| 253 | static char *PS2;
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| 254 | static struct variables shell_ver = { "HUSH_VERSION", "0.01", 1, 1, 0 };
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| 255 | static struct variables *top_vars = &shell_ver;
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| 256 |
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| 257 |
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| 258 | #define B_CHUNK (100)
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| 259 | #define B_NOSPAC 1
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| 260 |
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| 261 | typedef struct {
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| 262 | char *data;
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| 263 | int length;
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| 264 | int maxlen;
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| 265 | int quote;
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| 266 | int nonnull;
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| 267 | } o_string;
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| 268 | #define NULL_O_STRING {NULL,0,0,0,0}
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| 269 | /* used for initialization:
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| 270 | o_string foo = NULL_O_STRING; */
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| 271 |
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| 272 | /* I can almost use ordinary FILE *. Is open_memstream() universally
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| 273 | * available? Where is it documented? */
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| 274 | struct in_str {
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| 275 | const char *p;
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| 276 | char peek_buf[2];
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| 277 | int __promptme;
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| 278 | int promptmode;
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| 279 | FILE *file;
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| 280 | int (*get) (struct in_str *);
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| 281 | int (*peek) (struct in_str *);
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| 282 | };
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| 283 | #define b_getch(input) ((input)->get(input))
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| 284 | #define b_peek(input) ((input)->peek(input))
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| 285 |
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| 286 | #define JOB_STATUS_FORMAT "[%d] %-22s %.40s\n"
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| 287 |
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| 288 | struct built_in_command {
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| 289 | const char *cmd; /* name */
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| 290 | const char *descr; /* description */
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| 291 | int (*function) (struct child_prog *); /* function ptr */
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| 292 | };
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| 293 |
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| 294 | /* belongs in busybox.h */
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| 295 | static inline int max(int a, int b) {
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| 296 | return (a>b)?a:b;
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| 297 | }
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| 298 |
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| 299 | /* This should be in utility.c */
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| 300 | #ifdef DEBUG_SHELL
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| 301 | static void debug_printf(const char *format, ...)
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| 302 | {
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| 303 | va_list args;
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| 304 | va_start(args, format);
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| 305 | vfprintf(stderr, format, args);
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| 306 | va_end(args);
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| 307 | }
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| 308 | #else
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| 309 | static inline void debug_printf(const char *format ATTRIBUTE_UNUSED, ...) { }
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| 310 | #endif
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| 311 | #define final_printf debug_printf
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| 312 |
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| 313 | static void __syntax(char *file, int line) {
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| 314 | bb_error_msg("syntax error %s:%d", file, line);
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| 315 | }
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| 316 | #define syntax() __syntax(__FILE__, __LINE__)
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| 317 |
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| 318 | /* Index of subroutines: */
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| 319 | /* function prototypes for builtins */
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| 320 | static int builtin_cd(struct child_prog *child);
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| 321 | static int builtin_env(struct child_prog *child);
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| 322 | static int builtin_eval(struct child_prog *child);
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| 323 | static int builtin_exec(struct child_prog *child);
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| 324 | static int builtin_exit(struct child_prog *child);
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| 325 | static int builtin_export(struct child_prog *child);
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| 326 | static int builtin_fg_bg(struct child_prog *child);
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| 327 | static int builtin_help(struct child_prog *child);
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| 328 | static int builtin_jobs(struct child_prog *child);
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| 329 | static int builtin_pwd(struct child_prog *child);
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| 330 | static int builtin_read(struct child_prog *child);
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| 331 | static int builtin_set(struct child_prog *child);
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| 332 | static int builtin_shift(struct child_prog *child);
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| 333 | static int builtin_source(struct child_prog *child);
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| 334 | static int builtin_umask(struct child_prog *child);
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| 335 | static int builtin_unset(struct child_prog *child);
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| 336 | static int builtin_not_written(struct child_prog *child);
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| 337 | /* o_string manipulation: */
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| 338 | static int b_check_space(o_string *o, int len);
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| 339 | static int b_addchr(o_string *o, int ch);
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| 340 | static void b_reset(o_string *o);
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| 341 | static int b_addqchr(o_string *o, int ch, int quote);
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| 342 | static int b_adduint(o_string *o, unsigned int i);
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| 343 | /* in_str manipulations: */
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| 344 | static int static_get(struct in_str *i);
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| 345 | static int static_peek(struct in_str *i);
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| 346 | static int file_get(struct in_str *i);
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| 347 | static int file_peek(struct in_str *i);
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| 348 | static void setup_file_in_str(struct in_str *i, FILE *f);
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| 349 | static void setup_string_in_str(struct in_str *i, const char *s);
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| 350 | /* close_me manipulations: */
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| 351 | static void mark_open(int fd);
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| 352 | static void mark_closed(int fd);
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| 353 | static void close_all(void);
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| 354 | /* "run" the final data structures: */
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| 355 | static char *indenter(int i);
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| 356 | static int free_pipe_list(struct pipe *head, int indent);
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| 357 | static int free_pipe(struct pipe *pi, int indent);
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| 358 | /* really run the final data structures: */
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| 359 | static int setup_redirects(struct child_prog *prog, int squirrel[]);
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| 360 | static int run_list_real(struct pipe *pi);
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| 361 | static void pseudo_exec(struct child_prog *child) ATTRIBUTE_NORETURN;
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| 362 | static int run_pipe_real(struct pipe *pi);
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| 363 | /* extended glob support: */
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| 364 | static int globhack(const char *src, int flags, glob_t *pglob);
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| 365 | static int glob_needed(const char *s);
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| 366 | static int xglob(o_string *dest, int flags, glob_t *pglob);
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| 367 | /* variable assignment: */
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| 368 | static int is_assignment(const char *s);
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| 369 | /* data structure manipulation: */
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| 370 | static int setup_redirect(struct p_context *ctx, int fd, redir_type style, struct in_str *input);
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| 371 | static void initialize_context(struct p_context *ctx);
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| 372 | static int done_word(o_string *dest, struct p_context *ctx);
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| 373 | static int done_command(struct p_context *ctx);
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| 374 | static int done_pipe(struct p_context *ctx, pipe_style type);
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| 375 | /* primary string parsing: */
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| 376 | static int redirect_dup_num(struct in_str *input);
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| 377 | static int redirect_opt_num(o_string *o);
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| 378 | static int process_command_subs(o_string *dest, struct p_context *ctx, struct in_str *input, int subst_end);
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| 379 | static int parse_group(o_string *dest, struct p_context *ctx, struct in_str *input, int ch);
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| 380 | static char *lookup_param(char *src);
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| 381 | static char *make_string(char **inp);
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| 382 | static int handle_dollar(o_string *dest, struct p_context *ctx, struct in_str *input);
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| 383 | static int parse_string(o_string *dest, struct p_context *ctx, const char *src);
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| 384 | static int parse_stream(o_string *dest, struct p_context *ctx, struct in_str *input0, int end_trigger);
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| 385 | /* setup: */
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| 386 | static int parse_stream_outer(struct in_str *inp, int flag);
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| 387 | static int parse_string_outer(const char *s, int flag);
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| 388 | static int parse_file_outer(FILE *f);
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| 389 | /* job management: */
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| 390 | static int checkjobs(struct pipe* fg_pipe);
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| 391 | static void insert_bg_job(struct pipe *pi);
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| 392 | static void remove_bg_job(struct pipe *pi);
|
---|
| 393 | /* 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);
|
---|
| 399 |
|
---|
| 400 | /* Table of built-in functions. They can be forked or not, depending on
|
---|
| 401 | * context: within pipes, they fork. As simple commands, they do not.
|
---|
| 402 | * When used in non-forking context, they can change global variables
|
---|
| 403 | * in the parent shell process. If forked, of course they can not.
|
---|
| 404 | * For example, 'unset foo | whatever' will parse and run, but foo will
|
---|
| 405 | * still be set at the end. */
|
---|
| 406 | static 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}
|
---|
| 431 | };
|
---|
| 432 |
|
---|
| 433 | static const char *set_cwd(void)
|
---|
| 434 | {
|
---|
| 435 | if(cwd==bb_msg_unknown)
|
---|
| 436 | cwd = NULL; /* xgetcwd(arg) called free(arg) */
|
---|
| 437 | cwd = xgetcwd((char *)cwd);
|
---|
| 438 | if (!cwd)
|
---|
| 439 | cwd = bb_msg_unknown;
|
---|
| 440 | return cwd;
|
---|
| 441 | }
|
---|
| 442 |
|
---|
| 443 | /* built-in 'eval' handler */
|
---|
| 444 | static int builtin_eval(struct child_prog *child)
|
---|
| 445 | {
|
---|
| 446 | char *str = NULL;
|
---|
| 447 | int rcode = EXIT_SUCCESS;
|
---|
| 448 |
|
---|
| 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);
|
---|
| 453 | free(str);
|
---|
| 454 | rcode = last_return_code;
|
---|
| 455 | }
|
---|
| 456 | return rcode;
|
---|
| 457 | }
|
---|
| 458 |
|
---|
| 459 | /* 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");
|
---|
| 465 | else
|
---|
| 466 | newdir = child->argv[1];
|
---|
| 467 | if (chdir(newdir)) {
|
---|
| 468 | printf("cd: %s: %s\n", newdir, strerror(errno));
|
---|
| 469 | return EXIT_FAILURE;
|
---|
| 470 | }
|
---|
| 471 | set_cwd();
|
---|
| 472 | return EXIT_SUCCESS;
|
---|
| 473 | }
|
---|
| 474 |
|
---|
| 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 | }
|
---|
| 483 | return EXIT_SUCCESS;
|
---|
| 484 | }
|
---|
| 485 |
|
---|
| 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 |
|
---|
| 551 | /* built-in 'fg' and 'bg' handler */
|
---|
| 552 | static int builtin_fg_bg(struct child_prog *child)
|
---|
| 553 | {
|
---|
| 554 | int i, jobnum;
|
---|
| 555 | struct pipe *pi=NULL;
|
---|
| 556 |
|
---|
| 557 | if (!interactive)
|
---|
| 558 | return EXIT_FAILURE;
|
---|
| 559 | /* If they gave us no args, assume they want the last backgrounded task */
|
---|
| 560 | if (!child->argv[1]) {
|
---|
| 561 | for (pi = job_list; pi; pi = pi->next) {
|
---|
| 562 | 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') {
|
---|
| 587 | /* Put the job into the foreground. */
|
---|
| 588 | tcsetpgrp(shell_terminal, pi->pgrp);
|
---|
| 589 | }
|
---|
| 590 |
|
---|
| 591 | /* Restart the processes in the job */
|
---|
| 592 | for (i = 0; i < pi->num_progs; i++)
|
---|
| 593 | pi->progs[i].is_stopped = 0;
|
---|
| 594 |
|
---|
| 595 | if ( (i=kill(- pi->pgrp, SIGCONT)) < 0) {
|
---|
| 596 | if (i == ESRCH) {
|
---|
| 597 | remove_bg_job(pi);
|
---|
| 598 | } else {
|
---|
| 599 | bb_perror_msg("kill (SIGCONT)");
|
---|
| 600 | }
|
---|
| 601 | }
|
---|
| 602 |
|
---|
| 603 | pi->stopped_progs = 0;
|
---|
| 604 | return EXIT_SUCCESS;
|
---|
| 605 | }
|
---|
| 606 |
|
---|
| 607 | /* built-in 'help' handler */
|
---|
| 608 | static int builtin_help(struct child_prog *dummy ATTRIBUTE_UNUSED)
|
---|
| 609 | {
|
---|
| 610 | const struct built_in_command *x;
|
---|
| 611 |
|
---|
| 612 | printf("\nBuilt-in commands:\n");
|
---|
| 613 | printf("-------------------\n");
|
---|
| 614 | for (x = bltins; x->cmd; x++) {
|
---|
| 615 | if (x->descr==NULL)
|
---|
| 616 | continue;
|
---|
| 617 | printf("%s\t%s\n", x->cmd, x->descr);
|
---|
| 618 | }
|
---|
| 619 | printf("\n\n");
|
---|
| 620 | return EXIT_SUCCESS;
|
---|
| 621 | }
|
---|
| 622 |
|
---|
| 623 | /* built-in 'jobs' handler */
|
---|
| 624 | static int builtin_jobs(struct child_prog *child ATTRIBUTE_UNUSED)
|
---|
| 625 | {
|
---|
| 626 | struct pipe *job;
|
---|
| 627 | char *status_string;
|
---|
| 628 |
|
---|
| 629 | for (job = job_list; job; job = job->next) {
|
---|
| 630 | if (job->running_progs == job->stopped_progs)
|
---|
| 631 | status_string = "Stopped";
|
---|
| 632 | else
|
---|
| 633 | status_string = "Running";
|
---|
| 634 |
|
---|
| 635 | printf(JOB_STATUS_FORMAT, job->jobid, status_string, job->text);
|
---|
| 636 | }
|
---|
| 637 | return EXIT_SUCCESS;
|
---|
| 638 | }
|
---|
| 639 |
|
---|
| 640 |
|
---|
| 641 | /* built-in 'pwd' handler */
|
---|
| 642 | static int builtin_pwd(struct child_prog *dummy ATTRIBUTE_UNUSED)
|
---|
| 643 | {
|
---|
| 644 | puts(set_cwd());
|
---|
| 645 | return EXIT_SUCCESS;
|
---|
| 646 | }
|
---|
| 647 |
|
---|
| 648 | /* 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;
|
---|
| 682 |
|
---|
| 683 | if (temp == NULL)
|
---|
| 684 | for(e = top_vars; e; e=e->next)
|
---|
| 685 | printf("%s=%s\n", e->name, e->value);
|
---|
| 686 | else
|
---|
| 687 | set_local_var(temp, 0);
|
---|
| 688 |
|
---|
| 689 | return EXIT_SUCCESS;
|
---|
| 690 | }
|
---|
| 691 |
|
---|
| 692 |
|
---|
| 693 | /* 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 */
|
---|
| 702 | global_argc -= n;
|
---|
| 703 | global_argv += n;
|
---|
| 704 | return EXIT_SUCCESS;
|
---|
| 705 | } else {
|
---|
| 706 | return EXIT_FAILURE;
|
---|
| 707 | }
|
---|
| 708 | }
|
---|
| 709 |
|
---|
| 710 | /* Built-in '.' handler (read-in and execute commands from file) */
|
---|
| 711 | static int builtin_source(struct child_prog *child)
|
---|
| 712 | {
|
---|
| 713 | FILE *input;
|
---|
| 714 | int status;
|
---|
| 715 |
|
---|
| 716 | if (child->argv[1] == NULL)
|
---|
| 717 | return EXIT_FAILURE;
|
---|
| 718 |
|
---|
| 719 | /* XXX search through $PATH is missing */
|
---|
| 720 | input = fopen(child->argv[1], "r");
|
---|
| 721 | if (!input) {
|
---|
| 722 | bb_error_msg("Couldn't open file '%s'", child->argv[1]);
|
---|
| 723 | return EXIT_FAILURE;
|
---|
| 724 | }
|
---|
| 725 |
|
---|
| 726 | /* Now run the file */
|
---|
| 727 | /* XXX argv and argc are broken; need to save old global_argv
|
---|
| 728 | * (pointer only is OK!) on this stack frame,
|
---|
| 729 | * set global_argv=child->argv+1, recurse, and restore. */
|
---|
| 730 | mark_open(fileno(input));
|
---|
| 731 | status = parse_file_outer(input);
|
---|
| 732 | mark_closed(fileno(input));
|
---|
| 733 | fclose(input);
|
---|
| 734 | return (status);
|
---|
| 735 | }
|
---|
| 736 |
|
---|
| 737 | static int builtin_umask(struct child_prog *child)
|
---|
| 738 | {
|
---|
| 739 | mode_t new_umask;
|
---|
| 740 | const char *arg = child->argv[1];
|
---|
| 741 | char *end;
|
---|
| 742 | if (arg) {
|
---|
| 743 | new_umask=strtoul(arg, &end, 8);
|
---|
| 744 | if (*end!='\0' || end == arg) {
|
---|
| 745 | return EXIT_FAILURE;
|
---|
| 746 | }
|
---|
| 747 | } else {
|
---|
| 748 | printf("%.3o\n", (unsigned int) (new_umask=umask(0)));
|
---|
| 749 | }
|
---|
| 750 | umask(new_umask);
|
---|
| 751 | return EXIT_SUCCESS;
|
---|
| 752 | }
|
---|
| 753 |
|
---|
| 754 | /* 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]);
|
---|
| 759 | return EXIT_SUCCESS;
|
---|
| 760 | }
|
---|
| 761 |
|
---|
| 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 | }
|
---|
| 767 |
|
---|
| 768 | static int b_check_space(o_string *o, int len)
|
---|
| 769 | {
|
---|
| 770 | /* It would be easy to drop a more restrictive policy
|
---|
| 771 | * in here, such as setting a maximum string length */
|
---|
| 772 | 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 | }
|
---|
| 780 | }
|
---|
| 781 | return o->data == NULL;
|
---|
| 782 | }
|
---|
| 783 |
|
---|
| 784 | static int b_addchr(o_string *o, int ch)
|
---|
| 785 | {
|
---|
| 786 | debug_printf("b_addchr: %c %d %p\n", ch, o->length, o);
|
---|
| 787 | if (b_check_space(o, 1)) return B_NOSPAC;
|
---|
| 788 | o->data[o->length] = ch;
|
---|
| 789 | o->length++;
|
---|
| 790 | o->data[o->length] = '\0';
|
---|
| 791 | return 0;
|
---|
| 792 | }
|
---|
| 793 |
|
---|
| 794 | static void b_reset(o_string *o)
|
---|
| 795 | {
|
---|
| 796 | o->length = 0;
|
---|
| 797 | o->nonnull = 0;
|
---|
| 798 | if (o->data != NULL) *o->data = '\0';
|
---|
| 799 | }
|
---|
| 800 |
|
---|
| 801 | static void b_free(o_string *o)
|
---|
| 802 | {
|
---|
| 803 | b_reset(o);
|
---|
| 804 | free(o->data);
|
---|
| 805 | o->data = NULL;
|
---|
| 806 | o->maxlen = 0;
|
---|
| 807 | }
|
---|
| 808 |
|
---|
| 809 | /* My analysis of quoting semantics tells me that state information
|
---|
| 810 | * is associated with a destination, not a source.
|
---|
| 811 | */
|
---|
| 812 | static int b_addqchr(o_string *o, int ch, int quote)
|
---|
| 813 | {
|
---|
| 814 | if (quote && strchr("*?[\\",ch)) {
|
---|
| 815 | int rc;
|
---|
| 816 | rc = b_addchr(o, '\\');
|
---|
| 817 | if (rc) return rc;
|
---|
| 818 | }
|
---|
| 819 | return b_addchr(o, ch);
|
---|
| 820 | }
|
---|
| 821 |
|
---|
| 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 |
|
---|
| 845 | static int static_get(struct in_str *i)
|
---|
| 846 | {
|
---|
| 847 | int ch=*i->p++;
|
---|
| 848 | if (ch=='\0') return EOF;
|
---|
| 849 | return ch;
|
---|
| 850 | }
|
---|
| 851 |
|
---|
| 852 | static int static_peek(struct in_str *i)
|
---|
| 853 | {
|
---|
| 854 | return *i->p;
|
---|
| 855 | }
|
---|
| 856 |
|
---|
| 857 | static inline void cmdedit_set_initial_prompt(void)
|
---|
| 858 | {
|
---|
| 859 | #ifndef CONFIG_FEATURE_SH_FANCY_PROMPT
|
---|
| 860 | PS1 = NULL;
|
---|
| 861 | #else
|
---|
| 862 | PS1 = getenv("PS1");
|
---|
| 863 | if(PS1==0)
|
---|
| 864 | PS1 = "\\w \\$ ";
|
---|
| 865 | #endif
|
---|
| 866 | }
|
---|
| 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
|
---|
| 872 | /* 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;
|
---|
| 878 | } else {
|
---|
| 879 | *prompt_str = PS2;
|
---|
| 880 | }
|
---|
| 881 | #else
|
---|
| 882 | *prompt_str = (promptmode==1)? PS1 : PS2;
|
---|
| 883 | #endif
|
---|
| 884 | debug_printf("result %s\n",*prompt_str);
|
---|
| 885 | }
|
---|
| 886 |
|
---|
| 887 | static void get_user_input(struct in_str *i)
|
---|
| 888 | {
|
---|
| 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);
|
---|
| 901 | #else
|
---|
| 902 | fputs(prompt_str, stdout);
|
---|
| 903 | 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 | }
|
---|
| 910 |
|
---|
| 911 | /* This is the magic location that prints prompts
|
---|
| 912 | * and gets data back from the user */
|
---|
| 913 | static int file_get(struct in_str *i)
|
---|
| 914 | {
|
---|
| 915 | int ch;
|
---|
| 916 |
|
---|
| 917 | ch = 0;
|
---|
| 918 | /* If there is data waiting, eat it up */
|
---|
| 919 | if (i->p && *i->p) {
|
---|
| 920 | ch=*i->p++;
|
---|
| 921 | } else {
|
---|
| 922 | /* need to double check i->file because we might be doing something
|
---|
| 923 | * 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) ) {
|
---|
| 926 | 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;
|
---|
| 940 | return ch;
|
---|
| 941 | }
|
---|
| 942 |
|
---|
| 943 | /* All the callers guarantee this routine will never be
|
---|
| 944 | * used right after a newline, so prompting is not needed.
|
---|
| 945 | */
|
---|
| 946 | static int file_peek(struct in_str *i)
|
---|
| 947 | {
|
---|
| 948 | if (i->p && *i->p) {
|
---|
| 949 | 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 | }
|
---|
| 957 | }
|
---|
| 958 |
|
---|
| 959 | static void setup_file_in_str(struct in_str *i, FILE *f)
|
---|
| 960 | {
|
---|
| 961 | i->peek = file_peek;
|
---|
| 962 | i->get = file_get;
|
---|
| 963 | i->__promptme=1;
|
---|
| 964 | i->promptmode=1;
|
---|
| 965 | i->file = f;
|
---|
| 966 | i->p = NULL;
|
---|
| 967 | }
|
---|
| 968 |
|
---|
| 969 | static void setup_string_in_str(struct in_str *i, const char *s)
|
---|
| 970 | {
|
---|
| 971 | i->peek = static_peek;
|
---|
| 972 | i->get = static_get;
|
---|
| 973 | i->__promptme=1;
|
---|
| 974 | i->promptmode=1;
|
---|
| 975 | i->p = s;
|
---|
| 976 | }
|
---|
| 977 |
|
---|
| 978 | static void mark_open(int fd)
|
---|
| 979 | {
|
---|
| 980 | struct close_me *new = xmalloc(sizeof(struct close_me));
|
---|
| 981 | new->fd = fd;
|
---|
| 982 | new->next = close_me_head;
|
---|
| 983 | close_me_head = new;
|
---|
| 984 | }
|
---|
| 985 |
|
---|
| 986 | static void mark_closed(int fd)
|
---|
| 987 | {
|
---|
| 988 | struct close_me *tmp;
|
---|
| 989 | if (close_me_head == NULL || close_me_head->fd != fd)
|
---|
| 990 | bb_error_msg_and_die("corrupt close_me");
|
---|
| 991 | tmp = close_me_head;
|
---|
| 992 | close_me_head = close_me_head->next;
|
---|
| 993 | free(tmp);
|
---|
| 994 | }
|
---|
| 995 |
|
---|
| 996 | static void close_all(void)
|
---|
| 997 | {
|
---|
| 998 | struct close_me *c;
|
---|
| 999 | for (c=close_me_head; c; c=c->next) {
|
---|
| 1000 | close(c->fd);
|
---|
| 1001 | }
|
---|
| 1002 | close_me_head = NULL;
|
---|
| 1003 | }
|
---|
| 1004 |
|
---|
| 1005 | /* squirrel != NULL means we squirrel away copies of stdin, stdout,
|
---|
| 1006 | * and stderr if they are redirected. */
|
---|
| 1007 | static int setup_redirects(struct child_prog *prog, int squirrel[])
|
---|
| 1008 | {
|
---|
| 1009 | int openfd, mode;
|
---|
| 1010 | struct redir_struct *redir;
|
---|
| 1011 |
|
---|
| 1012 | for (redir=prog->redirects; redir; redir=redir->next) {
|
---|
| 1013 | if (redir->dup == -1 && redir->word.gl_pathv == NULL) {
|
---|
| 1014 | /* something went wrong in the parse. Pretend it didn't happen */
|
---|
| 1015 | continue;
|
---|
| 1016 | }
|
---|
| 1017 | if (redir->dup == -1) {
|
---|
| 1018 | mode=redir_table[redir->type].mode;
|
---|
| 1019 | openfd = open(redir->word.gl_pathv[0], mode, 0666);
|
---|
| 1020 | if (openfd < 0) {
|
---|
| 1021 | /* this could get lost if stderr has been redirected, but
|
---|
| 1022 | bash and ash both lose it as well (though zsh doesn't!) */
|
---|
| 1023 | bb_perror_msg("error opening %s", redir->word.gl_pathv[0]);
|
---|
| 1024 | return 1;
|
---|
| 1025 | }
|
---|
| 1026 | } else {
|
---|
| 1027 | openfd = redir->dup;
|
---|
| 1028 | }
|
---|
| 1029 |
|
---|
| 1030 | if (openfd != redir->fd) {
|
---|
| 1031 | if (squirrel && redir->fd < 3) {
|
---|
| 1032 | squirrel[redir->fd] = dup(redir->fd);
|
---|
| 1033 | }
|
---|
| 1034 | if (openfd == -3) {
|
---|
| 1035 | close(openfd);
|
---|
| 1036 | } else {
|
---|
| 1037 | dup2(openfd, redir->fd);
|
---|
| 1038 | if (redir->dup == -1)
|
---|
| 1039 | close (openfd);
|
---|
| 1040 | }
|
---|
| 1041 | }
|
---|
| 1042 | }
|
---|
| 1043 | return 0;
|
---|
| 1044 | }
|
---|
| 1045 |
|
---|
| 1046 | static void restore_redirects(int squirrel[])
|
---|
| 1047 | {
|
---|
| 1048 | int i, fd;
|
---|
| 1049 | for (i=0; i<3; i++) {
|
---|
| 1050 | fd = squirrel[i];
|
---|
| 1051 | 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);
|
---|
| 1056 | }
|
---|
| 1057 | }
|
---|
| 1058 | }
|
---|
| 1059 |
|
---|
| 1060 | /* never returns */
|
---|
| 1061 | /* XXX no exit() here. If you don't exec, use _exit instead.
|
---|
| 1062 | * 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)
|
---|
| 1065 | {
|
---|
| 1066 | int i, rcode;
|
---|
| 1067 | char *p;
|
---|
| 1068 | const struct built_in_command *x;
|
---|
| 1069 | 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!!!! */
|
---|
| 1130 | rcode = run_list_real(child->group);
|
---|
| 1131 | /* OK to leak memory by not calling free_pipe_list,
|
---|
| 1132 | * since this process is about to exit */
|
---|
| 1133 | _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 | }
|
---|
| 1139 | }
|
---|
| 1140 |
|
---|
| 1141 | static void insert_bg_job(struct pipe *pi)
|
---|
| 1142 | {
|
---|
| 1143 | struct pipe *thejob;
|
---|
| 1144 |
|
---|
| 1145 | /* Linear search for the ID of the job to use */
|
---|
| 1146 | pi->jobid = 1;
|
---|
| 1147 | for (thejob = job_list; thejob; thejob = thejob->next)
|
---|
| 1148 | if (thejob->jobid >= pi->jobid)
|
---|
| 1149 | pi->jobid = thejob->jobid + 1;
|
---|
| 1150 |
|
---|
| 1151 | /* add thejob to the list of running jobs */
|
---|
| 1152 | if (!job_list) {
|
---|
| 1153 | thejob = job_list = xmalloc(sizeof(*thejob));
|
---|
| 1154 | } else {
|
---|
| 1155 | for (thejob = job_list; thejob->next; thejob = thejob->next) /* nothing */;
|
---|
| 1156 | thejob->next = xmalloc(sizeof(*thejob));
|
---|
| 1157 | thejob = thejob->next;
|
---|
| 1158 | }
|
---|
| 1159 |
|
---|
| 1160 | /* physically copy the struct job */
|
---|
| 1161 | memcpy(thejob, pi, sizeof(struct pipe));
|
---|
| 1162 | 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
|
---|
| 1177 | to the list of backgrounded thejobs and leave it alone */
|
---|
| 1178 | printf("[%d] %d\n", thejob->jobid, thejob->progs[0].pid);
|
---|
| 1179 | last_bg_pid = thejob->progs[0].pid;
|
---|
| 1180 | last_jobid = thejob->jobid;
|
---|
| 1181 | }
|
---|
| 1182 |
|
---|
| 1183 | /* remove a backgrounded job */
|
---|
| 1184 | static void remove_bg_job(struct pipe *pi)
|
---|
| 1185 | {
|
---|
| 1186 | struct pipe *prev_pipe;
|
---|
| 1187 |
|
---|
| 1188 | if (pi == job_list) {
|
---|
| 1189 | job_list = pi->next;
|
---|
| 1190 | } else {
|
---|
| 1191 | prev_pipe = job_list;
|
---|
| 1192 | while (prev_pipe->next != pi)
|
---|
| 1193 | prev_pipe = prev_pipe->next;
|
---|
| 1194 | prev_pipe->next = pi->next;
|
---|
| 1195 | }
|
---|
| 1196 | if (job_list)
|
---|
| 1197 | last_jobid = job_list->jobid;
|
---|
| 1198 | else
|
---|
| 1199 | last_jobid = 0;
|
---|
| 1200 |
|
---|
| 1201 | pi->stopped_progs = 0;
|
---|
| 1202 | free_pipe(pi, 0);
|
---|
| 1203 | free(pi);
|
---|
| 1204 | }
|
---|
| 1205 |
|
---|
| 1206 | /* Checks to see if any processes have exited -- if they
|
---|
| 1207 | have, figure out why and see if a job has completed */
|
---|
| 1208 | static int checkjobs(struct pipe* fg_pipe)
|
---|
| 1209 | {
|
---|
| 1210 | int attributes;
|
---|
| 1211 | int status;
|
---|
| 1212 | int prognum = 0;
|
---|
| 1213 | struct pipe *pi;
|
---|
| 1214 | pid_t childpid;
|
---|
| 1215 |
|
---|
| 1216 | attributes = WUNTRACED;
|
---|
| 1217 | if (fg_pipe==NULL) {
|
---|
| 1218 | attributes |= WNOHANG;
|
---|
| 1219 | }
|
---|
| 1220 |
|
---|
| 1221 | while ((childpid = waitpid(-1, &status, attributes)) > 0) {
|
---|
| 1222 | if (fg_pipe) {
|
---|
| 1223 | int i, rcode = 0;
|
---|
| 1224 | for (i=0; i < fg_pipe->num_progs; i++) {
|
---|
| 1225 | 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);
|
---|
| 1230 | }
|
---|
| 1231 | }
|
---|
| 1232 | }
|
---|
| 1233 |
|
---|
| 1234 | for (pi = job_list; pi; pi = pi->next) {
|
---|
| 1235 | prognum = 0;
|
---|
| 1236 | while (prognum < pi->num_progs && pi->progs[prognum].pid != childpid) {
|
---|
| 1237 | prognum++;
|
---|
| 1238 | }
|
---|
| 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)) {
|
---|
| 1249 | /* child exited */
|
---|
| 1250 | pi->running_progs--;
|
---|
| 1251 | pi->progs[prognum].pid = 0;
|
---|
| 1252 |
|
---|
| 1253 | if (!pi->running_progs) {
|
---|
| 1254 | printf(JOB_STATUS_FORMAT, pi->jobid, "Done", pi->text);
|
---|
| 1255 | remove_bg_job(pi);
|
---|
| 1256 | }
|
---|
| 1257 | } else {
|
---|
| 1258 | /* child stopped */
|
---|
| 1259 | pi->stopped_progs++;
|
---|
| 1260 | 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)
|
---|
| 1274 | 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;
|
---|
| 1305 | }
|
---|
| 1306 | #endif
|
---|
| 1307 |
|
---|
| 1308 | /* run_pipe_real() starts all the jobs, but doesn't wait for anything
|
---|
| 1309 | * to finish. See checkjobs().
|
---|
| 1310 | *
|
---|
| 1311 | * return code is normally -1, when the caller has to wait for children
|
---|
| 1312 | * to finish to determine the exit status of the pipe. If the pipe
|
---|
| 1313 | * is a simple builtin command, however, the action is done by the
|
---|
| 1314 | * time run_pipe_real returns, and the exit code is provided as the
|
---|
| 1315 | * return value.
|
---|
| 1316 | *
|
---|
| 1317 | * The input of the pipe is always stdin, the output is always
|
---|
| 1318 | * stdout. The outpipe[] mechanism in BusyBox-0.48 lash is bogus,
|
---|
| 1319 | * because it tries to avoid running the command substitution in
|
---|
| 1320 | * subshell, when that is in fact necessary. The subshell process
|
---|
| 1321 | * now has its stdout directed to the input of the appropriate pipe,
|
---|
| 1322 | * so this routine is noticeably simpler.
|
---|
| 1323 | */
|
---|
| 1324 | static int run_pipe_real(struct pipe *pi)
|
---|
| 1325 | {
|
---|
| 1326 | int i;
|
---|
| 1327 | int nextin, nextout;
|
---|
| 1328 | int pipefds[2]; /* pipefds[0] is for reading */
|
---|
| 1329 | struct child_prog *child;
|
---|
| 1330 | const struct built_in_command *x;
|
---|
| 1331 | char *p;
|
---|
| 1332 |
|
---|
| 1333 | nextin = 0;
|
---|
| 1334 | pi->pgrp = -1;
|
---|
| 1335 |
|
---|
| 1336 | /* Check if this is a simple builtin (not part of a pipe).
|
---|
| 1337 | * Builtins within pipes have to fork anyway, and are handled in
|
---|
| 1338 | * pseudo_exec. "echo foo | read bar" doesn't work on bash, either.
|
---|
| 1339 | */
|
---|
| 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;
|
---|
| 1344 | debug_printf("non-subshell grouping\n");
|
---|
| 1345 | 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? */
|
---|
| 1348 | rcode = run_list_real(child->group);
|
---|
| 1349 | 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) {
|
---|
| 1354 | /* 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);
|
---|
| 1377 | }
|
---|
| 1378 | return EXIT_SUCCESS; /* don't worry about errors in set_local_var() yet */
|
---|
| 1379 | }
|
---|
| 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;
|
---|
| 1395 | }
|
---|
| 1396 | 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) {
|
---|
| 1401 | debug_printf("magic exec\n");
|
---|
| 1402 | setup_redirects(child,NULL);
|
---|
| 1403 | return EXIT_SUCCESS;
|
---|
| 1404 | }
|
---|
| 1405 | debug_printf("builtin inline %s\n", child->argv[0]);
|
---|
| 1406 | /* XXX setup_redirects acts on file descriptors, not FILEs.
|
---|
| 1407 | * This is perfect for work that comes after exec().
|
---|
| 1408 | * Is it really safe for inline use? Experimentally,
|
---|
| 1409 | * things seem to work with glibc. */
|
---|
| 1410 | 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 */
|
---|
| 1414 | restore_redirects(squirrel);
|
---|
| 1415 | return rcode;
|
---|
| 1416 | }
|
---|
| 1417 | }
|
---|
| 1418 | }
|
---|
| 1419 |
|
---|
| 1420 | for (i = 0; i < pi->num_progs; i++) {
|
---|
| 1421 | child = & (pi->progs[i]);
|
---|
| 1422 |
|
---|
| 1423 | /* pipes are inserted between pairs of commands */
|
---|
| 1424 | if ((i + 1) < pi->num_progs) {
|
---|
| 1425 | if (pipe(pipefds)<0) bb_perror_msg_and_die("pipe");
|
---|
| 1426 | nextout = pipefds[1];
|
---|
| 1427 | } else {
|
---|
| 1428 | nextout=1;
|
---|
| 1429 | pipefds[0] = -1;
|
---|
| 1430 | }
|
---|
| 1431 |
|
---|
| 1432 | /* XXX test for failed fork()? */
|
---|
| 1433 | #if !defined(__UCLIBC__) || defined(__ARCH_HAS_MMU__)
|
---|
| 1434 | if (!(child->pid = fork()))
|
---|
| 1435 | #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 |
|
---|
| 1448 | close_all();
|
---|
| 1449 |
|
---|
| 1450 | if (nextin != 0) {
|
---|
| 1451 | dup2(nextin, 0);
|
---|
| 1452 | close(nextin);
|
---|
| 1453 | }
|
---|
| 1454 | if (nextout != 1) {
|
---|
| 1455 | dup2(nextout, 1);
|
---|
| 1456 | close(nextout);
|
---|
| 1457 | }
|
---|
| 1458 | if (pipefds[0]!=-1) {
|
---|
| 1459 | close(pipefds[0]); /* opposite end of our output pipe */
|
---|
| 1460 | }
|
---|
| 1461 |
|
---|
| 1462 | /* Like bash, explicit redirects override pipes,
|
---|
| 1463 | * 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 |
|
---|
| 1477 | pseudo_exec(child);
|
---|
| 1478 | }
|
---|
| 1479 |
|
---|
| 1480 |
|
---|
| 1481 | /* put our child in the process group whose leader is the
|
---|
| 1482 | first process in this pipe */
|
---|
| 1483 | if (pi->pgrp < 0) {
|
---|
| 1484 | 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 |
|
---|
| 1490 | if (nextin != 0)
|
---|
| 1491 | close(nextin);
|
---|
| 1492 | if (nextout != 1)
|
---|
| 1493 | close(nextout);
|
---|
| 1494 |
|
---|
| 1495 | /* If there isn't another process, nextin is garbage
|
---|
| 1496 | but it doesn't matter */
|
---|
| 1497 | nextin = pipefds[0];
|
---|
| 1498 | }
|
---|
| 1499 | return -1;
|
---|
| 1500 | }
|
---|
| 1501 |
|
---|
| 1502 | static int run_list_real(struct pipe *pi)
|
---|
| 1503 | {
|
---|
| 1504 | char *save_name = NULL;
|
---|
| 1505 | char **list = NULL;
|
---|
| 1506 | char **save_list = NULL;
|
---|
| 1507 | struct pipe *rpipe;
|
---|
| 1508 | int flag_rep = 0;
|
---|
| 1509 | int save_num_progs;
|
---|
| 1510 | int rcode=0, flag_skip=1;
|
---|
| 1511 | 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;
|
---|
| 1514 | /* check syntax for "for" */
|
---|
| 1515 | 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;
|
---|
| 1544 | continue;
|
---|
| 1545 | }
|
---|
| 1546 | 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) {
|
---|
| 1554 | /* if no variable values after "in" we skip "for" */
|
---|
| 1555 | if (!pi->next->progs->argv) continue;
|
---|
| 1556 | /* 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];
|
---|
| 1561 | pi->progs->argv[0] = NULL;
|
---|
| 1562 | flag_rep = 1;
|
---|
| 1563 | }
|
---|
| 1564 | if (!(*list)) {
|
---|
| 1565 | free(pi->progs->argv[0]);
|
---|
| 1566 | free(save_list);
|
---|
| 1567 | list = NULL;
|
---|
| 1568 | flag_rep = 0;
|
---|
| 1569 | pi->progs->argv[0] = save_name;
|
---|
| 1570 | pi->progs->glob_result.gl_pathv[0] =
|
---|
| 1571 | pi->progs->argv[0];
|
---|
| 1572 | 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)) {
|
---|
| 1587 | if (flag_rep) {
|
---|
| 1588 | flag_restore = 1;
|
---|
| 1589 | } else {
|
---|
| 1590 | rpipe = NULL;
|
---|
| 1591 | }
|
---|
| 1592 | }
|
---|
| 1593 | if (pi->num_progs == 0) continue;
|
---|
| 1594 | save_num_progs = pi->num_progs; /* save number of programs */
|
---|
| 1595 | rcode = run_pipe_real(pi);
|
---|
| 1596 | debug_printf("run_pipe_real returned %d\n",rcode);
|
---|
| 1597 | if (rcode!=-1) {
|
---|
| 1598 | /* We only ran a builtin: rcode was set by the return value
|
---|
| 1599 | * 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);
|
---|
| 1605 | rcode = EXIT_SUCCESS;
|
---|
| 1606 | } 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");
|
---|
| 1611 | 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;
|
---|
| 1621 | 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)
|
---|
| 1625 | flag_rep = !last_return_code;
|
---|
| 1626 | if (rmode == RES_UNTIL)
|
---|
| 1627 | 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;
|
---|
| 1631 | checkjobs(NULL);
|
---|
| 1632 | }
|
---|
| 1633 | 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];
|
---|
| 1641 | }
|
---|
| 1642 |
|
---|
| 1643 | /* return code is the exit status of the pipe */
|
---|
| 1644 | static int free_pipe(struct pipe *pi, int indent)
|
---|
| 1645 | {
|
---|
| 1646 | char **p;
|
---|
| 1647 | struct child_prog *child;
|
---|
| 1648 | struct redir_struct *r, *rnext;
|
---|
| 1649 | int a, i, ret_code=0;
|
---|
| 1650 | char *ind = indenter(indent);
|
---|
| 1651 |
|
---|
| 1652 | if (pi->stopped_progs > 0)
|
---|
| 1653 | return ret_code;
|
---|
| 1654 | final_printf("%s run pipe: (pid %d)\n",ind,getpid());
|
---|
| 1655 | for (i=0; i<pi->num_progs; i++) {
|
---|
| 1656 | child = &pi->progs[i];
|
---|
| 1657 | final_printf("%s command %d:\n",ind,i);
|
---|
| 1658 | if (child->argv) {
|
---|
| 1659 | for (a=0,p=child->argv; *p; a++,p++) {
|
---|
| 1660 | final_printf("%s argv[%d] = %s\n",ind,a,*p);
|
---|
| 1661 | }
|
---|
| 1662 | globfree(&child->glob_result);
|
---|
| 1663 | child->argv=NULL;
|
---|
| 1664 | } 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);
|
---|
| 1668 | } 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);
|
---|
| 1673 | if (r->dup == -1) {
|
---|
| 1674 | /* guard against the case >$FOO, where foo is unset or blank */
|
---|
| 1675 | if (r->word.gl_pathv) {
|
---|
| 1676 | final_printf(" %s\n", *r->word.gl_pathv);
|
---|
| 1677 | globfree(&r->word);
|
---|
| 1678 | }
|
---|
| 1679 | } else {
|
---|
| 1680 | final_printf("&%d\n", r->dup);
|
---|
| 1681 | }
|
---|
| 1682 | rnext=r->next;
|
---|
| 1683 | free(r);
|
---|
| 1684 | }
|
---|
| 1685 | child->redirects=NULL;
|
---|
| 1686 | }
|
---|
| 1687 | free(pi->progs); /* children are an array, they get freed all at once */
|
---|
| 1688 | pi->progs=NULL;
|
---|
| 1689 | return ret_code;
|
---|
| 1690 | }
|
---|
| 1691 |
|
---|
| 1692 | static int free_pipe_list(struct pipe *head, int indent)
|
---|
| 1693 | {
|
---|
| 1694 | int rcode=0; /* if list has no members */
|
---|
| 1695 | 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);
|
---|
| 1699 | 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;
|
---|
| 1703 | free(pi);
|
---|
| 1704 | }
|
---|
| 1705 | return rcode;
|
---|
| 1706 | }
|
---|
| 1707 |
|
---|
| 1708 | /* Select which version we will use */
|
---|
| 1709 | static int run_list(struct pipe *pi)
|
---|
| 1710 | {
|
---|
| 1711 | int rcode=0;
|
---|
| 1712 | if (fake_mode==0) {
|
---|
| 1713 | rcode = run_list_real(pi);
|
---|
| 1714 | }
|
---|
| 1715 | /* free_pipe_list has the side effect of clearing memory
|
---|
| 1716 | * In the long run that function can be merged with run_list_real,
|
---|
| 1717 | * but doing that now would hobble the debugging effort. */
|
---|
| 1718 | free_pipe_list(pi,0);
|
---|
| 1719 | return rcode;
|
---|
| 1720 | }
|
---|
| 1721 |
|
---|
| 1722 | /* The API for glob is arguably broken. This routine pushes a non-matching
|
---|
| 1723 | * string into the output structure, removing non-backslashed backslashes.
|
---|
| 1724 | * If someone can prove me wrong, by performing this function within the
|
---|
| 1725 | * original glob(3) api, feel free to rewrite this routine into oblivion.
|
---|
| 1726 | * Return code (0 vs. GLOB_NOSPACE) matches glob(3).
|
---|
| 1727 | * XXX broken if the last character is '\\', check that before calling.
|
---|
| 1728 | */
|
---|
| 1729 | static int globhack(const char *src, int flags, glob_t *pglob)
|
---|
| 1730 | {
|
---|
| 1731 | int cnt=0, pathc;
|
---|
| 1732 | const char *s;
|
---|
| 1733 | char *dest;
|
---|
| 1734 | for (cnt=1, s=src; s && *s; s++) {
|
---|
| 1735 | if (*s == '\\') s++;
|
---|
| 1736 | cnt++;
|
---|
| 1737 | }
|
---|
| 1738 | dest = malloc(cnt);
|
---|
| 1739 | if (!dest) return GLOB_NOSPACE;
|
---|
| 1740 | if (!(flags & GLOB_APPEND)) {
|
---|
| 1741 | pglob->gl_pathv=NULL;
|
---|
| 1742 | pglob->gl_pathc=0;
|
---|
| 1743 | pglob->gl_offs=0;
|
---|
| 1744 | pglob->gl_offs=0;
|
---|
| 1745 | }
|
---|
| 1746 | 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++) {
|
---|
| 1752 | if (*s == '\\') s++;
|
---|
| 1753 | *dest = *s;
|
---|
| 1754 | }
|
---|
| 1755 | *dest='\0';
|
---|
| 1756 | return 0;
|
---|
| 1757 | }
|
---|
| 1758 |
|
---|
| 1759 | /* XXX broken if the last character is '\\', check that before calling */
|
---|
| 1760 | static int glob_needed(const char *s)
|
---|
| 1761 | {
|
---|
| 1762 | for (; *s; s++) {
|
---|
| 1763 | if (*s == '\\') s++;
|
---|
| 1764 | if (strchr("*[?",*s)) return 1;
|
---|
| 1765 | }
|
---|
| 1766 | return 0;
|
---|
| 1767 | }
|
---|
| 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
|
---|
| 1781 |
|
---|
| 1782 | static int xglob(o_string *dest, int flags, glob_t *pglob)
|
---|
| 1783 | {
|
---|
| 1784 | int gr;
|
---|
| 1785 |
|
---|
| 1786 | /* short-circuit for null word */
|
---|
| 1787 | /* we can code this better when the debug_printf's are gone */
|
---|
| 1788 | if (dest->length == 0) {
|
---|
| 1789 | if (dest->nonnull) {
|
---|
| 1790 | /* bash man page calls this an "explicit" null */
|
---|
| 1791 | gr = globhack(dest->data, flags, pglob);
|
---|
| 1792 | debug_printf("globhack returned %d\n",gr);
|
---|
| 1793 | } else {
|
---|
| 1794 | return 0;
|
---|
| 1795 | }
|
---|
| 1796 | } else if (glob_needed(dest->data)) {
|
---|
| 1797 | gr = glob(dest->data, flags, NULL, pglob);
|
---|
| 1798 | debug_printf("glob returned %d\n",gr);
|
---|
| 1799 | if (gr == GLOB_NOMATCH) {
|
---|
| 1800 | /* quote removal, or more accurately, backslash removal */
|
---|
| 1801 | gr = globhack(dest->data, flags, pglob);
|
---|
| 1802 | debug_printf("globhack returned %d\n",gr);
|
---|
| 1803 | }
|
---|
| 1804 | } else {
|
---|
| 1805 | gr = globhack(dest->data, flags, pglob);
|
---|
| 1806 | debug_printf("globhack returned %d\n",gr);
|
---|
| 1807 | }
|
---|
| 1808 | if (gr == GLOB_NOSPACE)
|
---|
| 1809 | bb_error_msg_and_die("out of memory during glob");
|
---|
| 1810 | if (gr != 0) { /* GLOB_ABORTED ? */
|
---|
| 1811 | bb_error_msg("glob(3) error %d",gr);
|
---|
| 1812 | }
|
---|
| 1813 | /* globprint(glob_target); */
|
---|
| 1814 | return gr;
|
---|
| 1815 | }
|
---|
| 1816 |
|
---|
| 1817 | /* 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)
|
---|
| 1823 | return NULL;
|
---|
| 1824 | for (cur = top_vars; cur; cur=cur->next)
|
---|
| 1825 | if(strcmp(cur->name, s)==0)
|
---|
| 1826 | return cur->value;
|
---|
| 1827 | return NULL;
|
---|
| 1828 | }
|
---|
| 1829 |
|
---|
| 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);
|
---|
| 1848 | return -1;
|
---|
| 1849 | }
|
---|
| 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;
|
---|
| 1905 | }
|
---|
| 1906 |
|
---|
| 1907 | static void unset_local_var(const char *name)
|
---|
| 1908 | {
|
---|
| 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) {
|
---|
| 1919 | bb_error_msg("%s: readonly variable", name);
|
---|
| 1920 | 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 | }
|
---|
| 1930 | free(cur);
|
---|
| 1931 | }
|
---|
| 1932 | }
|
---|
| 1933 | }
|
---|
| 1934 |
|
---|
| 1935 | static int is_assignment(const char *s)
|
---|
| 1936 | {
|
---|
| 1937 | if (s==NULL || !isalpha(*s)) return 0;
|
---|
| 1938 | ++s;
|
---|
| 1939 | while(isalnum(*s) || *s=='_') ++s;
|
---|
| 1940 | return *s=='=';
|
---|
| 1941 | }
|
---|
| 1942 |
|
---|
| 1943 | /* the src parameter allows us to peek forward to a possible &n syntax
|
---|
| 1944 | * for file descriptor duplication, e.g., "2>&1".
|
---|
| 1945 | * Return code is 0 normally, 1 if a syntax error is detected in src.
|
---|
| 1946 | * Resource errors (in xmalloc) cause the process to exit */
|
---|
| 1947 | static int setup_redirect(struct p_context *ctx, int fd, redir_type style,
|
---|
| 1948 | struct in_str *input)
|
---|
| 1949 | {
|
---|
| 1950 | struct child_prog *child=ctx->child;
|
---|
| 1951 | struct redir_struct *redir = child->redirects;
|
---|
| 1952 | struct redir_struct *last_redir=NULL;
|
---|
| 1953 |
|
---|
| 1954 | /* 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;
|
---|
| 1958 | }
|
---|
| 1959 | redir = xmalloc(sizeof(struct redir_struct));
|
---|
| 1960 | redir->next=NULL;
|
---|
| 1961 | redir->word.gl_pathv=NULL;
|
---|
| 1962 | if (last_redir) {
|
---|
| 1963 | last_redir->next=redir;
|
---|
| 1964 | } else {
|
---|
| 1965 | child->redirects=redir;
|
---|
| 1966 | }
|
---|
| 1967 |
|
---|
| 1968 | redir->type=style;
|
---|
| 1969 | redir->fd= (fd==-1) ? redir_table[style].default_fd : fd ;
|
---|
| 1970 |
|
---|
| 1971 | debug_printf("Redirect type %d%s\n", redir->fd, redir_table[style].descrip);
|
---|
| 1972 |
|
---|
| 1973 | /* Check for a '2>&1' type redirect */
|
---|
| 1974 | redir->dup = redirect_dup_num(input);
|
---|
| 1975 | if (redir->dup == -2) return 1; /* syntax error */
|
---|
| 1976 | if (redir->dup != -1) {
|
---|
| 1977 | /* Erik had a check here that the file descriptor in question
|
---|
| 1978 | * is legit; I postpone that to "run time"
|
---|
| 1979 | * A "-" representation of "close me" shows up as a -3 here */
|
---|
| 1980 | debug_printf("Duplicating redirect '%d>&%d'\n", redir->fd, redir->dup);
|
---|
| 1981 | } else {
|
---|
| 1982 | /* We do _not_ try to open the file that src points to,
|
---|
| 1983 | * since we need to return and let src be expanded first.
|
---|
| 1984 | * Set ctx->pending_redirect, so we know what to do at the
|
---|
| 1985 | * end of the next parsed word.
|
---|
| 1986 | */
|
---|
| 1987 | ctx->pending_redirect = redir;
|
---|
| 1988 | }
|
---|
| 1989 | return 0;
|
---|
| 1990 | }
|
---|
| 1991 |
|
---|
| 1992 | static struct pipe *new_pipe(void) {
|
---|
| 1993 | 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;
|
---|
| 2000 | return pi;
|
---|
| 2001 | }
|
---|
| 2002 |
|
---|
| 2003 | static void initialize_context(struct p_context *ctx)
|
---|
| 2004 | {
|
---|
| 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;
|
---|
| 2013 | done_command(ctx); /* creates the memory for working child */
|
---|
| 2014 | }
|
---|
| 2015 |
|
---|
| 2016 | /* normal return is 0
|
---|
| 2017 | * if a reserved word is found, and processed, return 1
|
---|
| 2018 | * should handle if, then, elif, else, fi, for, while, until, do, done.
|
---|
| 2019 | * case, function, and select are obnoxious, save those for later.
|
---|
| 2020 | */
|
---|
| 2021 | static int reserved_word(o_string *dest, struct p_context *ctx)
|
---|
| 2022 | {
|
---|
| 2023 | struct reserved_combo {
|
---|
| 2024 | char *literal;
|
---|
| 2025 | int code;
|
---|
| 2026 | long flag;
|
---|
| 2027 | };
|
---|
| 2028 | /* Mostly a list of accepted follow-up reserved words.
|
---|
| 2029 | * FLAG_END means we are done with the sequence, and are ready
|
---|
| 2030 | * to turn the compound list into a command.
|
---|
| 2031 | * FLAG_START means the word must start a new compound list.
|
---|
| 2032 | */
|
---|
| 2033 | static struct reserved_combo reserved_list[] = {
|
---|
| 2034 | { "if", RES_IF, FLAG_THEN | FLAG_START },
|
---|
| 2035 | { "then", RES_THEN, FLAG_ELIF | FLAG_ELSE | FLAG_FI },
|
---|
| 2036 | { "elif", RES_ELIF, FLAG_THEN },
|
---|
| 2037 | { "else", RES_ELSE, FLAG_FI },
|
---|
| 2038 | { "fi", RES_FI, FLAG_END },
|
---|
| 2039 | { "for", RES_FOR, FLAG_IN | FLAG_START },
|
---|
| 2040 | { "while", RES_WHILE, FLAG_DO | FLAG_START },
|
---|
| 2041 | { "until", RES_UNTIL, FLAG_DO | FLAG_START },
|
---|
| 2042 | { "in", RES_IN, FLAG_DO },
|
---|
| 2043 | { "do", RES_DO, FLAG_DONE },
|
---|
| 2044 | { "done", RES_DONE, FLAG_END }
|
---|
| 2045 | };
|
---|
| 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;
|
---|
| 2068 | b_reset(dest);
|
---|
| 2069 | return 1;
|
---|
| 2070 | }
|
---|
| 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);
|
---|
| 2084 | return 1;
|
---|
| 2085 | }
|
---|
| 2086 | }
|
---|
| 2087 | return 0;
|
---|
| 2088 | }
|
---|
| 2089 |
|
---|
| 2090 | /* normal return is 0.
|
---|
| 2091 | * Syntax or xglob errors return 1. */
|
---|
| 2092 | static int done_word(o_string *dest, struct p_context *ctx)
|
---|
| 2093 | {
|
---|
| 2094 | struct child_prog *child=ctx->child;
|
---|
| 2095 | glob_t *glob_target;
|
---|
| 2096 | int gr, flags = 0;
|
---|
| 2097 |
|
---|
| 2098 | debug_printf("done_word: %s %p\n", dest->data, child);
|
---|
| 2099 | if (dest->length == 0 && !dest->nonnull) {
|
---|
| 2100 | debug_printf(" true null, ignored\n");
|
---|
| 2101 | return 0;
|
---|
| 2102 | }
|
---|
| 2103 | if (ctx->pending_redirect) {
|
---|
| 2104 | glob_target = &ctx->pending_redirect->word;
|
---|
| 2105 | } else {
|
---|
| 2106 | 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;
|
---|
| 2113 | }
|
---|
| 2114 | glob_target = &child->glob_result;
|
---|
| 2115 | if (child->argv) flags |= GLOB_APPEND;
|
---|
| 2116 | }
|
---|
| 2117 | gr = xglob(dest, flags, glob_target);
|
---|
| 2118 | if (gr != 0) return 1;
|
---|
| 2119 |
|
---|
| 2120 | b_reset(dest);
|
---|
| 2121 | if (ctx->pending_redirect) {
|
---|
| 2122 | ctx->pending_redirect=NULL;
|
---|
| 2123 | if (glob_target->gl_pathc != 1) {
|
---|
| 2124 | bb_error_msg("ambiguous redirect");
|
---|
| 2125 | return 1;
|
---|
| 2126 | }
|
---|
| 2127 | } else {
|
---|
| 2128 | child->argv = glob_target->gl_pathv;
|
---|
| 2129 | }
|
---|
| 2130 | if (ctx->w == RES_FOR) {
|
---|
| 2131 | done_word(dest,ctx);
|
---|
| 2132 | done_pipe(ctx,PIPE_SEQ);
|
---|
| 2133 | }
|
---|
| 2134 | return 0;
|
---|
| 2135 | }
|
---|
| 2136 |
|
---|
| 2137 | /* The only possible error here is out of memory, in which case
|
---|
| 2138 | * xmalloc exits. */
|
---|
| 2139 | static int done_command(struct p_context *ctx)
|
---|
| 2140 | {
|
---|
| 2141 | /* 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) {
|
---|
| 2155 | pi->num_progs++;
|
---|
| 2156 | debug_printf("done_command: num_progs incremented to %d\n",pi->num_progs);
|
---|
| 2157 | } else {
|
---|
| 2158 | debug_printf("done_command: initializing\n");
|
---|
| 2159 | }
|
---|
| 2160 | 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 |
|
---|
| 2173 | /* but ctx->pipe and ctx->list_head remain unchanged */
|
---|
| 2174 | return 0;
|
---|
| 2175 | }
|
---|
| 2176 |
|
---|
| 2177 | static int done_pipe(struct p_context *ctx, pipe_style type)
|
---|
| 2178 | {
|
---|
| 2179 | struct pipe *new_p;
|
---|
| 2180 | done_command(ctx); /* implicit closure of previous command */
|
---|
| 2181 | debug_printf("done_pipe, type %d\n", type);
|
---|
| 2182 | 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 */
|
---|
| 2189 | return 0;
|
---|
| 2190 | }
|
---|
| 2191 |
|
---|
| 2192 | /* peek ahead in the in_str to find out if we have a "&n" construct,
|
---|
| 2193 | * as in "2>&1", that represents duplicating a file descriptor.
|
---|
| 2194 | * returns either -2 (syntax error), -1 (no &), or the number found.
|
---|
| 2195 | */
|
---|
| 2196 | static int redirect_dup_num(struct in_str *input)
|
---|
| 2197 | {
|
---|
| 2198 | int ch, d=0, ok=0;
|
---|
| 2199 | ch = b_peek(input);
|
---|
| 2200 | if (ch != '&') return -1;
|
---|
| 2201 |
|
---|
| 2202 | b_getch(input); /* get the & */
|
---|
| 2203 | ch=b_peek(input);
|
---|
| 2204 | if (ch == '-') {
|
---|
| 2205 | b_getch(input);
|
---|
| 2206 | return -3; /* "-" represents "close me" */
|
---|
| 2207 | }
|
---|
| 2208 | while (isdigit(ch)) {
|
---|
| 2209 | d = d*10+(ch-'0');
|
---|
| 2210 | ok=1;
|
---|
| 2211 | b_getch(input);
|
---|
| 2212 | ch = b_peek(input);
|
---|
| 2213 | }
|
---|
| 2214 | if (ok) return d;
|
---|
| 2215 |
|
---|
| 2216 | bb_error_msg("ambiguous redirect");
|
---|
| 2217 | return -2;
|
---|
| 2218 | }
|
---|
| 2219 |
|
---|
| 2220 | /* If a redirect is immediately preceded by a number, that number is
|
---|
| 2221 | * supposed to tell which file descriptor to redirect. This routine
|
---|
| 2222 | * looks for such preceding numbers. In an ideal world this routine
|
---|
| 2223 | * needs to handle all the following classes of redirects...
|
---|
| 2224 | * echo 2>foo # redirects fd 2 to file "foo", nothing passed to echo
|
---|
| 2225 | * echo 49>foo # redirects fd 49 to file "foo", nothing passed to echo
|
---|
| 2226 | * echo -2>foo # redirects fd 1 to file "foo", "-2" passed to echo
|
---|
| 2227 | * echo 49x>foo # redirects fd 1 to file "foo", "49x" passed to echo
|
---|
| 2228 | * A -1 output from this program means no valid number was found, so the
|
---|
| 2229 | * caller should use the appropriate default for this redirection.
|
---|
| 2230 | */
|
---|
| 2231 | static int redirect_opt_num(o_string *o)
|
---|
| 2232 | {
|
---|
| 2233 | int num;
|
---|
| 2234 |
|
---|
| 2235 | if (o->length==0) return -1;
|
---|
| 2236 | for(num=0; num<o->length; num++) {
|
---|
| 2237 | if (!isdigit(*(o->data+num))) {
|
---|
| 2238 | return -1;
|
---|
| 2239 | }
|
---|
| 2240 | }
|
---|
| 2241 | /* reuse num (and save an int) */
|
---|
| 2242 | num=atoi(o->data);
|
---|
| 2243 | b_reset(o);
|
---|
| 2244 | return num;
|
---|
| 2245 | }
|
---|
| 2246 |
|
---|
| 2247 | static FILE *generate_stream_from_list(struct pipe *head)
|
---|
| 2248 | {
|
---|
| 2249 | FILE *pf;
|
---|
| 2250 | #if 1
|
---|
| 2251 | 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();
|
---|
| 2255 | #else
|
---|
| 2256 | pid=vfork();
|
---|
| 2257 | #endif
|
---|
| 2258 | if (pid<0) {
|
---|
| 2259 | bb_perror_msg_and_die("fork");
|
---|
| 2260 | } else if (pid==0) {
|
---|
| 2261 | close(channel[0]);
|
---|
| 2262 | if (channel[1] != 1) {
|
---|
| 2263 | dup2(channel[1],1);
|
---|
| 2264 | close(channel[1]);
|
---|
| 2265 | }
|
---|
| 2266 | #if 0
|
---|
| 2267 | #define SURROGATE "surrogate response"
|
---|
| 2268 | write(1,SURROGATE,sizeof(SURROGATE));
|
---|
| 2269 | _exit(run_list(head));
|
---|
| 2270 | #else
|
---|
| 2271 | _exit(run_list_real(head)); /* leaks memory */
|
---|
| 2272 | #endif
|
---|
| 2273 | }
|
---|
| 2274 | debug_printf("forked child %d\n",pid);
|
---|
| 2275 | 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
|
---|
| 2283 | return pf;
|
---|
| 2284 | }
|
---|
| 2285 |
|
---|
| 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;
|
---|
| 2292 | struct p_context inner;
|
---|
| 2293 | FILE *p;
|
---|
| 2294 | struct in_str pipe_str;
|
---|
| 2295 | initialize_context(&inner);
|
---|
| 2296 |
|
---|
| 2297 | /* recursion to generate command */
|
---|
| 2298 | retcode = parse_stream(&result, &inner, input, subst_end);
|
---|
| 2299 | if (retcode != 0) return retcode; /* syntax error or EOF */
|
---|
| 2300 | done_word(&result, &inner);
|
---|
| 2301 | done_pipe(&inner, PIPE_SEQ);
|
---|
| 2302 | b_free(&result);
|
---|
| 2303 |
|
---|
| 2304 | p=generate_stream_from_list(inner.list_head);
|
---|
| 2305 | if (p==NULL) return 1;
|
---|
| 2306 | mark_open(fileno(p));
|
---|
| 2307 | setup_file_in_str(&pipe_str, p);
|
---|
| 2308 |
|
---|
| 2309 | /* 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 */ };
|
---|
| 2315 | }
|
---|
| 2316 |
|
---|
| 2317 | debug_printf("done reading from pipe, pclose()ing\n");
|
---|
| 2318 | /* This is the step that wait()s for the child. Should be pretty
|
---|
| 2319 | * 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
|
---|
| 2321 | * at the same time. That would be a lot of work, and contrary
|
---|
| 2322 | * to the KISS philosophy of this program. */
|
---|
| 2323 | 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 */
|
---|
| 2328 | return retcode;
|
---|
| 2329 | }
|
---|
| 2330 |
|
---|
| 2331 | static int parse_group(o_string *dest, struct p_context *ctx,
|
---|
| 2332 | struct in_str *input, int ch)
|
---|
| 2333 | {
|
---|
| 2334 | int rcode, endch=0;
|
---|
| 2335 | struct p_context sub;
|
---|
| 2336 | struct child_prog *child = ctx->child;
|
---|
| 2337 | if (child->argv) {
|
---|
| 2338 | syntax();
|
---|
| 2339 | return 1; /* syntax error, groups and arglists don't mix */
|
---|
| 2340 | }
|
---|
| 2341 | 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 */
|
---|
| 2349 | done_pipe(&sub, PIPE_SEQ); /* and the final command there, too */
|
---|
| 2350 | child->group = sub.list_head;
|
---|
| 2351 | return rcode;
|
---|
| 2352 | /* child remains "open", available for possible redirects */
|
---|
| 2353 | }
|
---|
| 2354 |
|
---|
| 2355 | /* basically useful version until someone wants to get fancier,
|
---|
| 2356 | * 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;
|
---|
| 2366 | }
|
---|
| 2367 |
|
---|
| 2368 | /* return code: 0 for OK, 1 for syntax error */
|
---|
| 2369 | static int handle_dollar(o_string *dest, struct p_context *ctx, struct in_str *input)
|
---|
| 2370 | {
|
---|
| 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);
|
---|
| 2375 | if (isalpha(ch)) {
|
---|
| 2376 | b_addchr(dest, SPECIAL_VAR_SYMBOL);
|
---|
| 2377 | ctx->child->sp++;
|
---|
| 2378 | while(ch=b_peek(input),isalnum(ch) || ch=='_') {
|
---|
| 2379 | b_getch(input);
|
---|
| 2380 | b_addchr(dest,ch);
|
---|
| 2381 | }
|
---|
| 2382 | b_addchr(dest, SPECIAL_VAR_SYMBOL);
|
---|
| 2383 | } else if (isdigit(ch)) {
|
---|
| 2384 | i = ch-'0'; /* XXX is $0 special? */
|
---|
| 2385 | if (i<global_argc) {
|
---|
| 2386 | parse_string(dest, ctx, global_argv[i]); /* recursion */
|
---|
| 2387 | }
|
---|
| 2388 | advance = 1;
|
---|
| 2389 | } else switch (ch) {
|
---|
| 2390 | case '$':
|
---|
| 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;
|
---|
| 2406 | case '{':
|
---|
| 2407 | b_addchr(dest, SPECIAL_VAR_SYMBOL);
|
---|
| 2408 | ctx->child->sp++;
|
---|
| 2409 | b_getch(input);
|
---|
| 2410 | /* 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;
|
---|
| 2417 | }
|
---|
| 2418 | b_addchr(dest, SPECIAL_VAR_SYMBOL);
|
---|
| 2419 | break;
|
---|
| 2420 | case '(':
|
---|
| 2421 | b_getch(input);
|
---|
| 2422 | process_command_subs(dest, ctx, input, ')');
|
---|
| 2423 | 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 '@':
|
---|
| 2432 | case '-':
|
---|
| 2433 | case '_':
|
---|
| 2434 | /* still unhandled, but should be eventually */
|
---|
| 2435 | bb_error_msg("unhandled syntax: $%c",ch);
|
---|
| 2436 | return 1;
|
---|
| 2437 | break;
|
---|
| 2438 | default:
|
---|
| 2439 | b_addqchr(dest,'$',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);
|
---|
| 2447 | return 0;
|
---|
| 2448 | }
|
---|
| 2449 |
|
---|
| 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 |
|
---|
| 2457 | /* 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)
|
---|
| 2460 | {
|
---|
| 2461 | int ch, m;
|
---|
| 2462 | int redir_fd;
|
---|
| 2463 | redir_type redir_style;
|
---|
| 2464 | int next;
|
---|
| 2465 |
|
---|
| 2466 | /* Only double-quote state is handled in the state variable dest->quote.
|
---|
| 2467 | * A single-quote triggers a bypass of the main loop until its mate is
|
---|
| 2468 | * found. When recursing, quote state is passed in via dest->quote. */
|
---|
| 2469 |
|
---|
| 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)) {
|
---|
| 2477 | 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) {
|
---|
| 2501 | case '#':
|
---|
| 2502 | if (dest->length == 0 && !dest->quote) {
|
---|
| 2503 | while(ch=b_peek(input),ch!=EOF && ch!='\n') { b_getch(input); }
|
---|
| 2504 | } else {
|
---|
| 2505 | b_addqchr(dest, ch, dest->quote);
|
---|
| 2506 | }
|
---|
| 2507 | break;
|
---|
| 2508 | case '\\':
|
---|
| 2509 | if (next == EOF) {
|
---|
| 2510 | syntax();
|
---|
| 2511 | return 1;
|
---|
| 2512 | }
|
---|
| 2513 | b_addqchr(dest, '\\', dest->quote);
|
---|
| 2514 | b_addqchr(dest, b_getch(input), dest->quote);
|
---|
| 2515 | break;
|
---|
| 2516 | case '$':
|
---|
| 2517 | if (handle_dollar(dest, ctx, input)!=0) return 1;
|
---|
| 2518 | break;
|
---|
| 2519 | case '\'':
|
---|
| 2520 | dest->nonnull = 1;
|
---|
| 2521 | while(ch=b_getch(input),ch!=EOF && ch!='\'') {
|
---|
| 2522 | b_addchr(dest,ch);
|
---|
| 2523 | }
|
---|
| 2524 | if (ch==EOF) {
|
---|
| 2525 | syntax();
|
---|
| 2526 | return 1;
|
---|
| 2527 | }
|
---|
| 2528 | break;
|
---|
| 2529 | case '"':
|
---|
| 2530 | dest->nonnull = 1;
|
---|
| 2531 | dest->quote = !dest->quote;
|
---|
| 2532 | break;
|
---|
| 2533 | case '`':
|
---|
| 2534 | process_command_subs(dest, ctx, input, '`');
|
---|
| 2535 | break;
|
---|
| 2536 | case '>':
|
---|
| 2537 | redir_fd = redirect_opt_num(dest);
|
---|
| 2538 | done_word(dest, ctx);
|
---|
| 2539 | redir_style=REDIRECT_OVERWRITE;
|
---|
| 2540 | if (next == '>') {
|
---|
| 2541 | redir_style=REDIRECT_APPEND;
|
---|
| 2542 | b_getch(input);
|
---|
| 2543 | } else if (next == '(') {
|
---|
| 2544 | syntax(); /* until we support >(list) Process Substitution */
|
---|
| 2545 | return 1;
|
---|
| 2546 | }
|
---|
| 2547 | setup_redirect(ctx, redir_fd, redir_style, input);
|
---|
| 2548 | break;
|
---|
| 2549 | case '<':
|
---|
| 2550 | redir_fd = redirect_opt_num(dest);
|
---|
| 2551 | done_word(dest, ctx);
|
---|
| 2552 | redir_style=REDIRECT_INPUT;
|
---|
| 2553 | if (next == '<') {
|
---|
| 2554 | redir_style=REDIRECT_HEREIS;
|
---|
| 2555 | b_getch(input);
|
---|
| 2556 | } else if (next == '>') {
|
---|
| 2557 | redir_style=REDIRECT_IO;
|
---|
| 2558 | b_getch(input);
|
---|
| 2559 | } else if (next == '(') {
|
---|
| 2560 | syntax(); /* until we support <(list) Process Substitution */
|
---|
| 2561 | return 1;
|
---|
| 2562 | }
|
---|
| 2563 | setup_redirect(ctx, redir_fd, redir_style, input);
|
---|
| 2564 | break;
|
---|
| 2565 | case ';':
|
---|
| 2566 | done_word(dest, ctx);
|
---|
| 2567 | done_pipe(ctx,PIPE_SEQ);
|
---|
| 2568 | break;
|
---|
| 2569 | case '&':
|
---|
| 2570 | done_word(dest, ctx);
|
---|
| 2571 | if (next=='&') {
|
---|
| 2572 | b_getch(input);
|
---|
| 2573 | done_pipe(ctx,PIPE_AND);
|
---|
| 2574 | } else {
|
---|
| 2575 | done_pipe(ctx,PIPE_BG);
|
---|
| 2576 | }
|
---|
| 2577 | break;
|
---|
| 2578 | case '|':
|
---|
| 2579 | done_word(dest, ctx);
|
---|
| 2580 | if (next=='|') {
|
---|
| 2581 | b_getch(input);
|
---|
| 2582 | done_pipe(ctx,PIPE_OR);
|
---|
| 2583 | } else {
|
---|
| 2584 | /* we could pick up a file descriptor choice here
|
---|
| 2585 | * with redirect_opt_num(), but bash doesn't do it.
|
---|
| 2586 | * "echo foo 2| cat" yields "foo 2". */
|
---|
| 2587 | done_command(ctx);
|
---|
| 2588 | }
|
---|
| 2589 | break;
|
---|
| 2590 | case '(':
|
---|
| 2591 | case '{':
|
---|
| 2592 | if (parse_group(dest, ctx, input, ch)!=0) return 1;
|
---|
| 2593 | break;
|
---|
| 2594 | case ')':
|
---|
| 2595 | case '}':
|
---|
| 2596 | syntax(); /* Proper use of this character caught by end_trigger */
|
---|
| 2597 | return 1;
|
---|
| 2598 | break;
|
---|
| 2599 | 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
|
---|
| 2606 | * that was quoted. Example:
|
---|
| 2607 | * $ echo "`cat foo` plus more"
|
---|
| 2608 | * 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',
|
---|
| 2610 | * that is, we were really supposed to get end_trigger, and never got
|
---|
| 2611 | * one before the EOF. Can't use the standard "syntax error" return code,
|
---|
| 2612 | * 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;
|
---|
| 2615 | return 0;
|
---|
| 2616 | }
|
---|
| 2617 |
|
---|
| 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. */
|
---|
| 2627 | ifs = getenv("IFS");
|
---|
| 2628 | if (ifs == NULL) ifs=" \t\n";
|
---|
| 2629 | /* Precompute a list of 'flow through' behavior so it can be treated
|
---|
| 2630 | * quickly up front. Computation is necessary because of IFS.
|
---|
| 2631 | * 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.
|
---|
| 2634 | */
|
---|
| 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 */
|
---|
| 2639 | }
|
---|
| 2640 |
|
---|
| 2641 | /* 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 |
|
---|
| 2646 | struct p_context ctx;
|
---|
| 2647 | o_string temp=NULL_O_STRING;
|
---|
| 2648 | int rcode;
|
---|
| 2649 | do {
|
---|
| 2650 | ctx.type = flag;
|
---|
| 2651 | 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');
|
---|
| 2656 | if (rcode != 1 && ctx.old_flag != 0) {
|
---|
| 2657 | syntax();
|
---|
| 2658 | }
|
---|
| 2659 | if (rcode != 1 && ctx.old_flag == 0) {
|
---|
| 2660 | done_word(&temp, &ctx);
|
---|
| 2661 | done_pipe(&ctx,PIPE_SEQ);
|
---|
| 2662 | run_list(ctx.list_head);
|
---|
| 2663 | } else {
|
---|
| 2664 | if (ctx.old_flag != 0) {
|
---|
| 2665 | free(ctx.stack);
|
---|
| 2666 | b_reset(&temp);
|
---|
| 2667 | }
|
---|
| 2668 | temp.nonnull = 0;
|
---|
| 2669 | temp.quote = 0;
|
---|
| 2670 | inp->p = NULL;
|
---|
| 2671 | free_pipe_list(ctx.list_head,0);
|
---|
| 2672 | }
|
---|
| 2673 | b_free(&temp);
|
---|
| 2674 | } while (rcode != -1 && !(flag & FLAG_EXIT_FROM_LOOP)); /* loop on syntax errors, return on EOF */
|
---|
| 2675 | return 0;
|
---|
| 2676 | }
|
---|
| 2677 |
|
---|
| 2678 | static int parse_string_outer(const char *s, int flag)
|
---|
| 2679 | {
|
---|
| 2680 | struct in_str input;
|
---|
| 2681 | setup_string_in_str(&input, s);
|
---|
| 2682 | return parse_stream_outer(&input, flag);
|
---|
| 2683 | }
|
---|
| 2684 |
|
---|
| 2685 | static int parse_file_outer(FILE *f)
|
---|
| 2686 | {
|
---|
| 2687 | int rcode;
|
---|
| 2688 | struct in_str input;
|
---|
| 2689 | setup_file_in_str(&input, f);
|
---|
| 2690 | rcode = parse_stream_outer(&input, FLAG_PARSE_SEMICOLON);
|
---|
| 2691 | return rcode;
|
---|
| 2692 | }
|
---|
| 2693 |
|
---|
| 2694 | /* Make sure we have a controlling tty. If we get started under a job
|
---|
| 2695 | * aware app (like bash for example), make sure we are now in charge so
|
---|
| 2696 | * we don't fight over who gets the foreground */
|
---|
| 2697 | static void setup_job_control(void)
|
---|
| 2698 | {
|
---|
| 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);
|
---|
| 2712 |
|
---|
| 2713 | /* Put ourselves in our own process group. */
|
---|
| 2714 | setsid();
|
---|
| 2715 | shell_pgrp = getpid ();
|
---|
| 2716 | setpgid (shell_pgrp, shell_pgrp);
|
---|
| 2717 |
|
---|
| 2718 | /* Grab control of the terminal. */
|
---|
| 2719 | tcsetpgrp(shell_terminal, shell_pgrp);
|
---|
| 2720 | }
|
---|
| 2721 |
|
---|
| 2722 | int hush_main(int argc, char **argv)
|
---|
| 2723 | {
|
---|
| 2724 | int opt;
|
---|
| 2725 | FILE *input;
|
---|
| 2726 | char **e = environ;
|
---|
| 2727 |
|
---|
| 2728 | /* XXX what should these be while sourcing /etc/profile? */
|
---|
| 2729 | global_argc = argc;
|
---|
| 2730 | 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 |
|
---|
| 2744 | /* Initialize some more globals to non-zero values */
|
---|
| 2745 | set_cwd();
|
---|
| 2746 | #ifdef CONFIG_FEATURE_COMMAND_EDITING
|
---|
| 2747 | cmdedit_set_initial_prompt();
|
---|
| 2748 | #else
|
---|
| 2749 | PS1 = NULL;
|
---|
| 2750 | #endif
|
---|
| 2751 | 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 |
|
---|
| 2762 |
|
---|
| 2763 | if (argv[0] && argv[0][0] == '-') {
|
---|
| 2764 | debug_printf("\nsourcing /etc/profile\n");
|
---|
| 2765 | if ((input = fopen("/etc/profile", "r")) != NULL) {
|
---|
| 2766 | mark_open(fileno(input));
|
---|
| 2767 | parse_file_outer(input);
|
---|
| 2768 | mark_closed(fileno(input));
|
---|
| 2769 | fclose(input);
|
---|
| 2770 | }
|
---|
| 2771 | }
|
---|
| 2772 | input=stdin;
|
---|
| 2773 |
|
---|
| 2774 | while ((opt = getopt(argc, argv, "c:xif")) > 0) {
|
---|
| 2775 | 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:
|
---|
| 2791 | #ifndef BB_VER
|
---|
| 2792 | fprintf(stderr, "Usage: sh [FILE]...\n"
|
---|
| 2793 | " or: sh -c command [args]...\n\n");
|
---|
| 2794 | exit(EXIT_FAILURE);
|
---|
| 2795 | #else
|
---|
| 2796 | bb_show_usage();
|
---|
| 2797 | #endif
|
---|
| 2798 | }
|
---|
| 2799 | }
|
---|
| 2800 | /* A shell is interactive if the `-i' flag was given, or if all of
|
---|
| 2801 | * the following conditions are met:
|
---|
| 2802 | * no -c command
|
---|
| 2803 | * no arguments remaining or the -s flag given
|
---|
| 2804 | * standard input is a terminal
|
---|
| 2805 | * 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) {
|
---|
| 2814 | /* 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
|
---|
| 2820 | setup_job_control();
|
---|
| 2821 | }
|
---|
| 2822 |
|
---|
| 2823 | if (argv[optind]==NULL) {
|
---|
| 2824 | opt=parse_file_outer(stdin);
|
---|
| 2825 | goto final_return;
|
---|
| 2826 | }
|
---|
| 2827 |
|
---|
| 2828 | 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
|
---|
| 2835 | fclose(input);
|
---|
| 2836 | if (cwd && cwd != bb_msg_unknown)
|
---|
| 2837 | 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 | }
|
---|