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);
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393 | /* local variable support */
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394 | static char **make_list_in(char **inp, char *name);
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395 | static char *insert_var_value(char *inp);
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396 | static char *get_local_var(const char *var);
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397 | static void unset_local_var(const char *name);
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398 | static int set_local_var(const char *s, int flg_export);
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399 |
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400 | /* Table of built-in functions. They can be forked or not, depending on
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401 | * context: within pipes, they fork. As simple commands, they do not.
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402 | * When used in non-forking context, they can change global variables
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403 | * in the parent shell process. If forked, of course they can not.
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404 | * For example, 'unset foo | whatever' will parse and run, but foo will
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405 | * still be set at the end. */
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406 | static const struct built_in_command bltins[] = {
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407 | {"bg", "Resume a job in the background", builtin_fg_bg},
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408 | {"break", "Exit for, while or until loop", builtin_not_written},
|
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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 | }
|
---|