wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 1 | /* |
| 2 | * sh.c -- a prototype Bourne shell grammar parser |
| 3 | * Intended to follow the original Thompson and Ritchie |
| 4 | * "small and simple is beautiful" philosophy, which |
| 5 | * incidentally is a good match to today's BusyBox. |
| 6 | * |
| 7 | * Copyright (C) 2000,2001 Larry Doolittle <larry@doolittle.boa.org> |
| 8 | * |
| 9 | * Credits: |
| 10 | * The parser routines proper are all original material, first |
| 11 | * written Dec 2000 and Jan 2001 by Larry Doolittle. |
| 12 | * The execution engine, the builtins, and much of the underlying |
| 13 | * support has been adapted from busybox-0.49pre's lash, |
| 14 | * which is Copyright (C) 2000 by Lineo, Inc., and |
| 15 | * written by Erik Andersen <andersen@lineo.com>, <andersee@debian.org>. |
| 16 | * That, in turn, is based in part on ladsh.c, by Michael K. Johnson and |
| 17 | * Erik W. Troan, which they placed in the public domain. I don't know |
| 18 | * how much of the Johnson/Troan code has survived the repeated rewrites. |
| 19 | * Other credits: |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 20 | * b_addchr() derived from similar w_addchar function in glibc-2.2 |
| 21 | * setup_redirect(), redirect_opt_num(), and big chunks of main() |
| 22 | * and many builtins derived from contributions by Erik Andersen |
| 23 | * miscellaneous bugfixes from Matt Kraai |
| 24 | * |
| 25 | * There are two big (and related) architecture differences between |
| 26 | * this parser and the lash parser. One is that this version is |
| 27 | * actually designed from the ground up to understand nearly all |
| 28 | * of the Bourne grammar. The second, consequential change is that |
| 29 | * the parser and input reader have been turned inside out. Now, |
| 30 | * the parser is in control, and asks for input as needed. The old |
| 31 | * way had the input reader in control, and it asked for parsing to |
| 32 | * take place as needed. The new way makes it much easier to properly |
| 33 | * handle the recursion implicit in the various substitutions, especially |
| 34 | * across continuation lines. |
| 35 | * |
| 36 | * Bash grammar not implemented: (how many of these were in original sh?) |
| 37 | * $@ (those sure look like weird quoting rules) |
| 38 | * $_ |
| 39 | * ! negation operator for pipes |
| 40 | * &> and >& redirection of stdout+stderr |
| 41 | * Brace Expansion |
| 42 | * Tilde Expansion |
| 43 | * fancy forms of Parameter Expansion |
| 44 | * aliases |
| 45 | * Arithmetic Expansion |
| 46 | * <(list) and >(list) Process Substitution |
| 47 | * reserved words: case, esac, select, function |
| 48 | * Here Documents ( << word ) |
| 49 | * Functions |
| 50 | * Major bugs: |
| 51 | * job handling woefully incomplete and buggy |
| 52 | * reserved word execution woefully incomplete and buggy |
| 53 | * to-do: |
| 54 | * port selected bugfixes from post-0.49 busybox lash - done? |
| 55 | * finish implementing reserved words: for, while, until, do, done |
| 56 | * change { and } from special chars to reserved words |
| 57 | * builtins: break, continue, eval, return, set, trap, ulimit |
| 58 | * test magic exec |
| 59 | * handle children going into background |
| 60 | * clean up recognition of null pipes |
| 61 | * check setting of global_argc and global_argv |
| 62 | * control-C handling, probably with longjmp |
| 63 | * follow IFS rules more precisely, including update semantics |
| 64 | * figure out what to do with backslash-newline |
| 65 | * explain why we use signal instead of sigaction |
| 66 | * propagate syntax errors, die on resource errors? |
| 67 | * continuation lines, both explicit and implicit - done? |
| 68 | * memory leak finding and plugging - done? |
| 69 | * more testing, especially quoting rules and redirection |
| 70 | * document how quoting rules not precisely followed for variable assignments |
| 71 | * maybe change map[] to use 2-bit entries |
| 72 | * (eventually) remove all the printf's |
| 73 | * |
Wolfgang Denk | d79de1d | 2013-07-08 09:37:19 +0200 | [diff] [blame] | 74 | * SPDX-License-Identifier: GPL-2.0+ |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 75 | */ |
Wolfgang Denk | d79de1d | 2013-07-08 09:37:19 +0200 | [diff] [blame] | 76 | |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 77 | #define __U_BOOT__ |
| 78 | #ifdef __U_BOOT__ |
| 79 | #include <malloc.h> /* malloc, free, realloc*/ |
| 80 | #include <linux/ctype.h> /* isalpha, isdigit */ |
| 81 | #include <common.h> /* readline */ |
Simon Glass | a73bda4 | 2015-11-08 23:47:45 -0700 | [diff] [blame] | 82 | #include <console.h> |
Simon Glass | 399ed9a | 2014-04-10 20:01:30 -0600 | [diff] [blame] | 83 | #include <bootretry.h> |
Simon Glass | dec3c01 | 2014-04-10 20:01:25 -0600 | [diff] [blame] | 84 | #include <cli.h> |
Simon Glass | 299f0be | 2014-04-10 20:01:24 -0600 | [diff] [blame] | 85 | #include <cli_hush.h> |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 86 | #include <command.h> /* find_cmd */ |
Tom Rini | 584c0ea | 2012-06-19 15:54:35 -0700 | [diff] [blame] | 87 | #ifndef CONFIG_SYS_PROMPT_HUSH_PS2 |
| 88 | #define CONFIG_SYS_PROMPT_HUSH_PS2 "> " |
| 89 | #endif |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 90 | #endif |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 91 | #ifndef __U_BOOT__ |
| 92 | #include <ctype.h> /* isalpha, isdigit */ |
| 93 | #include <unistd.h> /* getpid */ |
| 94 | #include <stdlib.h> /* getenv, atoi */ |
| 95 | #include <string.h> /* strchr */ |
| 96 | #include <stdio.h> /* popen etc. */ |
| 97 | #include <glob.h> /* glob, of course */ |
| 98 | #include <stdarg.h> /* va_list */ |
| 99 | #include <errno.h> |
| 100 | #include <fcntl.h> |
| 101 | #include <getopt.h> /* should be pretty obvious */ |
| 102 | |
| 103 | #include <sys/stat.h> /* ulimit */ |
| 104 | #include <sys/types.h> |
| 105 | #include <sys/wait.h> |
| 106 | #include <signal.h> |
| 107 | |
| 108 | /* #include <dmalloc.h> */ |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 109 | |
wdenk | e7f34c6 | 2003-01-11 09:48:40 +0000 | [diff] [blame] | 110 | #if 1 |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 111 | #include "busybox.h" |
| 112 | #include "cmdedit.h" |
| 113 | #else |
| 114 | #define applet_name "hush" |
| 115 | #include "standalone.h" |
| 116 | #define hush_main main |
wdenk | e7f34c6 | 2003-01-11 09:48:40 +0000 | [diff] [blame] | 117 | #undef CONFIG_FEATURE_SH_FANCY_PROMPT |
| 118 | #define BB_BANNER |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 119 | #endif |
| 120 | #endif |
| 121 | #define SPECIAL_VAR_SYMBOL 03 |
Joe Hershberger | 38de0b6 | 2012-08-17 10:26:30 +0000 | [diff] [blame] | 122 | #define SUBSTED_VAR_SYMBOL 04 |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 123 | #ifndef __U_BOOT__ |
| 124 | #define FLAG_EXIT_FROM_LOOP 1 |
| 125 | #define FLAG_PARSE_SEMICOLON (1 << 1) /* symbol ';' is special for parser */ |
| 126 | #define FLAG_REPARSING (1 << 2) /* >= 2nd pass */ |
| 127 | |
| 128 | #endif |
| 129 | |
| 130 | #ifdef __U_BOOT__ |
Wolfgang Denk | 6405a15 | 2006-03-31 18:32:53 +0200 | [diff] [blame] | 131 | DECLARE_GLOBAL_DATA_PTR; |
| 132 | |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 133 | #define EXIT_SUCCESS 0 |
| 134 | #define EOF -1 |
| 135 | #define syntax() syntax_err() |
| 136 | #define xstrdup strdup |
| 137 | #define error_msg printf |
| 138 | #else |
| 139 | typedef enum { |
| 140 | REDIRECT_INPUT = 1, |
| 141 | REDIRECT_OVERWRITE = 2, |
| 142 | REDIRECT_APPEND = 3, |
| 143 | REDIRECT_HEREIS = 4, |
| 144 | REDIRECT_IO = 5 |
| 145 | } redir_type; |
| 146 | |
| 147 | /* The descrip member of this structure is only used to make debugging |
| 148 | * output pretty */ |
| 149 | struct {int mode; int default_fd; char *descrip;} redir_table[] = { |
| 150 | { 0, 0, "()" }, |
| 151 | { O_RDONLY, 0, "<" }, |
| 152 | { O_CREAT|O_TRUNC|O_WRONLY, 1, ">" }, |
| 153 | { O_CREAT|O_APPEND|O_WRONLY, 1, ">>" }, |
| 154 | { O_RDONLY, -1, "<<" }, |
| 155 | { O_RDWR, 1, "<>" } |
| 156 | }; |
| 157 | #endif |
| 158 | |
| 159 | typedef enum { |
| 160 | PIPE_SEQ = 1, |
| 161 | PIPE_AND = 2, |
| 162 | PIPE_OR = 3, |
| 163 | PIPE_BG = 4, |
| 164 | } pipe_style; |
| 165 | |
| 166 | /* might eventually control execution */ |
| 167 | typedef enum { |
| 168 | RES_NONE = 0, |
| 169 | RES_IF = 1, |
| 170 | RES_THEN = 2, |
| 171 | RES_ELIF = 3, |
| 172 | RES_ELSE = 4, |
| 173 | RES_FI = 5, |
| 174 | RES_FOR = 6, |
| 175 | RES_WHILE = 7, |
| 176 | RES_UNTIL = 8, |
| 177 | RES_DO = 9, |
| 178 | RES_DONE = 10, |
| 179 | RES_XXXX = 11, |
| 180 | RES_IN = 12, |
| 181 | RES_SNTX = 13 |
| 182 | } reserved_style; |
| 183 | #define FLAG_END (1<<RES_NONE) |
| 184 | #define FLAG_IF (1<<RES_IF) |
| 185 | #define FLAG_THEN (1<<RES_THEN) |
| 186 | #define FLAG_ELIF (1<<RES_ELIF) |
| 187 | #define FLAG_ELSE (1<<RES_ELSE) |
| 188 | #define FLAG_FI (1<<RES_FI) |
| 189 | #define FLAG_FOR (1<<RES_FOR) |
| 190 | #define FLAG_WHILE (1<<RES_WHILE) |
| 191 | #define FLAG_UNTIL (1<<RES_UNTIL) |
| 192 | #define FLAG_DO (1<<RES_DO) |
| 193 | #define FLAG_DONE (1<<RES_DONE) |
| 194 | #define FLAG_IN (1<<RES_IN) |
| 195 | #define FLAG_START (1<<RES_XXXX) |
| 196 | |
| 197 | /* This holds pointers to the various results of parsing */ |
| 198 | struct p_context { |
| 199 | struct child_prog *child; |
| 200 | struct pipe *list_head; |
| 201 | struct pipe *pipe; |
| 202 | #ifndef __U_BOOT__ |
| 203 | struct redir_struct *pending_redirect; |
| 204 | #endif |
| 205 | reserved_style w; |
| 206 | int old_flag; /* for figuring out valid reserved words */ |
| 207 | struct p_context *stack; |
| 208 | int type; /* define type of parser : ";$" common or special symbol */ |
| 209 | /* How about quoting status? */ |
| 210 | }; |
| 211 | |
| 212 | #ifndef __U_BOOT__ |
| 213 | struct redir_struct { |
| 214 | redir_type type; /* type of redirection */ |
| 215 | int fd; /* file descriptor being redirected */ |
| 216 | int dup; /* -1, or file descriptor being duplicated */ |
| 217 | struct redir_struct *next; /* pointer to the next redirect in the list */ |
| 218 | glob_t word; /* *word.gl_pathv is the filename */ |
| 219 | }; |
| 220 | #endif |
| 221 | |
| 222 | struct child_prog { |
| 223 | #ifndef __U_BOOT__ |
| 224 | pid_t pid; /* 0 if exited */ |
| 225 | #endif |
| 226 | char **argv; /* program name and arguments */ |
Stephen Warren | 60c38c9 | 2014-03-01 22:16:10 -0700 | [diff] [blame] | 227 | /* was quoted when parsed; copy of struct o_string.nonnull field */ |
Simon Glass | 299f0be | 2014-04-10 20:01:24 -0600 | [diff] [blame] | 228 | int *argv_nonnull; |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 229 | #ifdef __U_BOOT__ |
| 230 | int argc; /* number of program arguments */ |
| 231 | #endif |
| 232 | struct pipe *group; /* if non-NULL, first in group or subshell */ |
| 233 | #ifndef __U_BOOT__ |
| 234 | int subshell; /* flag, non-zero if group must be forked */ |
| 235 | struct redir_struct *redirects; /* I/O redirections */ |
| 236 | glob_t glob_result; /* result of parameter globbing */ |
| 237 | int is_stopped; /* is the program currently running? */ |
| 238 | struct pipe *family; /* pointer back to the child's parent pipe */ |
| 239 | #endif |
| 240 | int sp; /* number of SPECIAL_VAR_SYMBOL */ |
| 241 | int type; |
| 242 | }; |
| 243 | |
| 244 | struct pipe { |
| 245 | #ifndef __U_BOOT__ |
| 246 | int jobid; /* job number */ |
| 247 | #endif |
| 248 | int num_progs; /* total number of programs in job */ |
| 249 | #ifndef __U_BOOT__ |
| 250 | int running_progs; /* number of programs running */ |
| 251 | char *text; /* name of job */ |
| 252 | char *cmdbuf; /* buffer various argv's point into */ |
| 253 | pid_t pgrp; /* process group ID for the job */ |
| 254 | #endif |
| 255 | struct child_prog *progs; /* array of commands in pipe */ |
| 256 | struct pipe *next; /* to track background commands */ |
| 257 | #ifndef __U_BOOT__ |
| 258 | int stopped_progs; /* number of programs alive, but stopped */ |
| 259 | int job_context; /* bitmask defining current context */ |
| 260 | #endif |
| 261 | pipe_style followup; /* PIPE_BG, PIPE_SEQ, PIPE_OR, PIPE_AND */ |
| 262 | reserved_style r_mode; /* supports if, for, while, until */ |
| 263 | }; |
| 264 | |
| 265 | #ifndef __U_BOOT__ |
| 266 | struct close_me { |
| 267 | int fd; |
| 268 | struct close_me *next; |
| 269 | }; |
| 270 | #endif |
| 271 | |
| 272 | struct variables { |
| 273 | char *name; |
| 274 | char *value; |
| 275 | int flg_export; |
| 276 | int flg_read_only; |
| 277 | struct variables *next; |
| 278 | }; |
| 279 | |
| 280 | /* globals, connect us to the outside world |
| 281 | * the first three support $?, $#, and $1 */ |
| 282 | #ifndef __U_BOOT__ |
| 283 | char **global_argv; |
| 284 | unsigned int global_argc; |
| 285 | #endif |
Kim Phillips | b052b60 | 2012-10-29 13:34:32 +0000 | [diff] [blame] | 286 | static unsigned int last_return_code; |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 287 | #ifndef __U_BOOT__ |
| 288 | extern char **environ; /* This is in <unistd.h>, but protected with __USE_GNU */ |
| 289 | #endif |
| 290 | |
| 291 | /* "globals" within this file */ |
Wolfgang Denk | 7fb5266 | 2005-10-13 16:45:02 +0200 | [diff] [blame] | 292 | static uchar *ifs; |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 293 | static char map[256]; |
| 294 | #ifndef __U_BOOT__ |
| 295 | static int fake_mode; |
| 296 | static int interactive; |
| 297 | static struct close_me *close_me_head; |
| 298 | static const char *cwd; |
| 299 | static struct pipe *job_list; |
| 300 | static unsigned int last_bg_pid; |
| 301 | static unsigned int last_jobid; |
| 302 | static unsigned int shell_terminal; |
| 303 | static char *PS1; |
| 304 | static char *PS2; |
| 305 | struct variables shell_ver = { "HUSH_VERSION", "0.01", 1, 1, 0 }; |
| 306 | struct variables *top_vars = &shell_ver; |
| 307 | #else |
| 308 | static int flag_repeat = 0; |
| 309 | static int do_repeat = 0; |
wdenk | bd1575f | 2003-10-14 19:43:55 +0000 | [diff] [blame] | 310 | static struct variables *top_vars = NULL ; |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 311 | #endif /*__U_BOOT__ */ |
| 312 | |
| 313 | #define B_CHUNK (100) |
| 314 | #define B_NOSPAC 1 |
| 315 | |
| 316 | typedef struct { |
| 317 | char *data; |
| 318 | int length; |
| 319 | int maxlen; |
| 320 | int quote; |
| 321 | int nonnull; |
| 322 | } o_string; |
| 323 | #define NULL_O_STRING {NULL,0,0,0,0} |
| 324 | /* used for initialization: |
| 325 | o_string foo = NULL_O_STRING; */ |
| 326 | |
| 327 | /* I can almost use ordinary FILE *. Is open_memstream() universally |
| 328 | * available? Where is it documented? */ |
| 329 | struct in_str { |
| 330 | const char *p; |
| 331 | #ifndef __U_BOOT__ |
| 332 | char peek_buf[2]; |
| 333 | #endif |
| 334 | int __promptme; |
| 335 | int promptmode; |
| 336 | #ifndef __U_BOOT__ |
| 337 | FILE *file; |
| 338 | #endif |
| 339 | int (*get) (struct in_str *); |
| 340 | int (*peek) (struct in_str *); |
| 341 | }; |
| 342 | #define b_getch(input) ((input)->get(input)) |
| 343 | #define b_peek(input) ((input)->peek(input)) |
| 344 | |
| 345 | #ifndef __U_BOOT__ |
| 346 | #define JOB_STATUS_FORMAT "[%d] %-22s %.40s\n" |
| 347 | |
| 348 | struct built_in_command { |
| 349 | char *cmd; /* name */ |
| 350 | char *descr; /* description */ |
| 351 | int (*function) (struct child_prog *); /* function ptr */ |
| 352 | }; |
| 353 | #endif |
| 354 | |
Stefan Roese | c23634d | 2008-08-19 14:57:55 +0200 | [diff] [blame] | 355 | /* define DEBUG_SHELL for debugging output (obviously ;-)) */ |
| 356 | #if 0 |
| 357 | #define DEBUG_SHELL |
| 358 | #endif |
| 359 | |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 360 | /* This should be in utility.c */ |
| 361 | #ifdef DEBUG_SHELL |
| 362 | #ifndef __U_BOOT__ |
| 363 | static void debug_printf(const char *format, ...) |
| 364 | { |
| 365 | va_list args; |
| 366 | va_start(args, format); |
| 367 | vfprintf(stderr, format, args); |
| 368 | va_end(args); |
| 369 | } |
| 370 | #else |
Stefan Roese | c23634d | 2008-08-19 14:57:55 +0200 | [diff] [blame] | 371 | #define debug_printf(fmt,args...) printf (fmt ,##args) |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 372 | #endif |
| 373 | #else |
| 374 | static inline void debug_printf(const char *format, ...) { } |
| 375 | #endif |
| 376 | #define final_printf debug_printf |
| 377 | |
| 378 | #ifdef __U_BOOT__ |
| 379 | static void syntax_err(void) { |
| 380 | printf("syntax error\n"); |
| 381 | } |
| 382 | #else |
| 383 | static void __syntax(char *file, int line) { |
| 384 | error_msg("syntax error %s:%d", file, line); |
| 385 | } |
| 386 | #define syntax() __syntax(__FILE__, __LINE__) |
| 387 | #endif |
| 388 | |
| 389 | #ifdef __U_BOOT__ |
| 390 | static void *xmalloc(size_t size); |
| 391 | static void *xrealloc(void *ptr, size_t size); |
| 392 | #else |
| 393 | /* Index of subroutines: */ |
| 394 | /* function prototypes for builtins */ |
| 395 | static int builtin_cd(struct child_prog *child); |
| 396 | static int builtin_env(struct child_prog *child); |
| 397 | static int builtin_eval(struct child_prog *child); |
| 398 | static int builtin_exec(struct child_prog *child); |
| 399 | static int builtin_exit(struct child_prog *child); |
| 400 | static int builtin_export(struct child_prog *child); |
| 401 | static int builtin_fg_bg(struct child_prog *child); |
| 402 | static int builtin_help(struct child_prog *child); |
| 403 | static int builtin_jobs(struct child_prog *child); |
| 404 | static int builtin_pwd(struct child_prog *child); |
| 405 | static int builtin_read(struct child_prog *child); |
| 406 | static int builtin_set(struct child_prog *child); |
| 407 | static int builtin_shift(struct child_prog *child); |
| 408 | static int builtin_source(struct child_prog *child); |
| 409 | static int builtin_umask(struct child_prog *child); |
| 410 | static int builtin_unset(struct child_prog *child); |
| 411 | static int builtin_not_written(struct child_prog *child); |
| 412 | #endif |
| 413 | /* o_string manipulation: */ |
| 414 | static int b_check_space(o_string *o, int len); |
| 415 | static int b_addchr(o_string *o, int ch); |
| 416 | static void b_reset(o_string *o); |
| 417 | static int b_addqchr(o_string *o, int ch, int quote); |
wdenk | 6203e40 | 2004-04-18 10:13:26 +0000 | [diff] [blame] | 418 | #ifndef __U_BOOT__ |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 419 | static int b_adduint(o_string *o, unsigned int i); |
wdenk | 6203e40 | 2004-04-18 10:13:26 +0000 | [diff] [blame] | 420 | #endif |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 421 | /* in_str manipulations: */ |
| 422 | static int static_get(struct in_str *i); |
| 423 | static int static_peek(struct in_str *i); |
| 424 | static int file_get(struct in_str *i); |
| 425 | static int file_peek(struct in_str *i); |
| 426 | #ifndef __U_BOOT__ |
| 427 | static void setup_file_in_str(struct in_str *i, FILE *f); |
| 428 | #else |
| 429 | static void setup_file_in_str(struct in_str *i); |
| 430 | #endif |
| 431 | static void setup_string_in_str(struct in_str *i, const char *s); |
| 432 | #ifndef __U_BOOT__ |
| 433 | /* close_me manipulations: */ |
| 434 | static void mark_open(int fd); |
| 435 | static void mark_closed(int fd); |
wdenk | e7f34c6 | 2003-01-11 09:48:40 +0000 | [diff] [blame] | 436 | static void close_all(void); |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 437 | #endif |
| 438 | /* "run" the final data structures: */ |
| 439 | static char *indenter(int i); |
| 440 | static int free_pipe_list(struct pipe *head, int indent); |
| 441 | static int free_pipe(struct pipe *pi, int indent); |
| 442 | /* really run the final data structures: */ |
| 443 | #ifndef __U_BOOT__ |
| 444 | static int setup_redirects(struct child_prog *prog, int squirrel[]); |
| 445 | #endif |
| 446 | static int run_list_real(struct pipe *pi); |
| 447 | #ifndef __U_BOOT__ |
| 448 | static void pseudo_exec(struct child_prog *child) __attribute__ ((noreturn)); |
| 449 | #endif |
| 450 | static int run_pipe_real(struct pipe *pi); |
| 451 | /* extended glob support: */ |
| 452 | #ifndef __U_BOOT__ |
| 453 | static int globhack(const char *src, int flags, glob_t *pglob); |
| 454 | static int glob_needed(const char *s); |
| 455 | static int xglob(o_string *dest, int flags, glob_t *pglob); |
| 456 | #endif |
| 457 | /* variable assignment: */ |
| 458 | static int is_assignment(const char *s); |
| 459 | /* data structure manipulation: */ |
| 460 | #ifndef __U_BOOT__ |
| 461 | static int setup_redirect(struct p_context *ctx, int fd, redir_type style, struct in_str *input); |
| 462 | #endif |
| 463 | static void initialize_context(struct p_context *ctx); |
| 464 | static int done_word(o_string *dest, struct p_context *ctx); |
| 465 | static int done_command(struct p_context *ctx); |
| 466 | static int done_pipe(struct p_context *ctx, pipe_style type); |
| 467 | /* primary string parsing: */ |
| 468 | #ifndef __U_BOOT__ |
| 469 | static int redirect_dup_num(struct in_str *input); |
| 470 | static int redirect_opt_num(o_string *o); |
| 471 | static int process_command_subs(o_string *dest, struct p_context *ctx, struct in_str *input, int subst_end); |
| 472 | static int parse_group(o_string *dest, struct p_context *ctx, struct in_str *input, int ch); |
| 473 | #endif |
| 474 | static char *lookup_param(char *src); |
Stephen Warren | 60c38c9 | 2014-03-01 22:16:10 -0700 | [diff] [blame] | 475 | static char *make_string(char **inp, int *nonnull); |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 476 | static int handle_dollar(o_string *dest, struct p_context *ctx, struct in_str *input); |
| 477 | #ifndef __U_BOOT__ |
| 478 | static int parse_string(o_string *dest, struct p_context *ctx, const char *src); |
| 479 | #endif |
| 480 | static int parse_stream(o_string *dest, struct p_context *ctx, struct in_str *input0, int end_trigger); |
| 481 | /* setup: */ |
| 482 | static int parse_stream_outer(struct in_str *inp, int flag); |
| 483 | #ifndef __U_BOOT__ |
| 484 | static int parse_string_outer(const char *s, int flag); |
| 485 | static int parse_file_outer(FILE *f); |
| 486 | #endif |
| 487 | #ifndef __U_BOOT__ |
| 488 | /* job management: */ |
| 489 | static int checkjobs(struct pipe* fg_pipe); |
| 490 | static void insert_bg_job(struct pipe *pi); |
| 491 | static void remove_bg_job(struct pipe *pi); |
| 492 | #endif |
| 493 | /* local variable support */ |
| 494 | static char **make_list_in(char **inp, char *name); |
| 495 | static char *insert_var_value(char *inp); |
Joe Hershberger | 38de0b6 | 2012-08-17 10:26:30 +0000 | [diff] [blame] | 496 | static char *insert_var_value_sub(char *inp, int tag_subst); |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 497 | |
| 498 | #ifndef __U_BOOT__ |
| 499 | /* Table of built-in functions. They can be forked or not, depending on |
| 500 | * context: within pipes, they fork. As simple commands, they do not. |
| 501 | * When used in non-forking context, they can change global variables |
| 502 | * in the parent shell process. If forked, of course they can not. |
| 503 | * For example, 'unset foo | whatever' will parse and run, but foo will |
| 504 | * still be set at the end. */ |
| 505 | static struct built_in_command bltins[] = { |
| 506 | {"bg", "Resume a job in the background", builtin_fg_bg}, |
| 507 | {"break", "Exit for, while or until loop", builtin_not_written}, |
| 508 | {"cd", "Change working directory", builtin_cd}, |
| 509 | {"continue", "Continue for, while or until loop", builtin_not_written}, |
| 510 | {"env", "Print all environment variables", builtin_env}, |
| 511 | {"eval", "Construct and run shell command", builtin_eval}, |
| 512 | {"exec", "Exec command, replacing this shell with the exec'd process", |
| 513 | builtin_exec}, |
| 514 | {"exit", "Exit from shell()", builtin_exit}, |
| 515 | {"export", "Set environment variable", builtin_export}, |
| 516 | {"fg", "Bring job into the foreground", builtin_fg_bg}, |
| 517 | {"jobs", "Lists the active jobs", builtin_jobs}, |
| 518 | {"pwd", "Print current directory", builtin_pwd}, |
| 519 | {"read", "Input environment variable", builtin_read}, |
| 520 | {"return", "Return from a function", builtin_not_written}, |
| 521 | {"set", "Set/unset shell local variables", builtin_set}, |
| 522 | {"shift", "Shift positional parameters", builtin_shift}, |
| 523 | {"trap", "Trap signals", builtin_not_written}, |
| 524 | {"ulimit","Controls resource limits", builtin_not_written}, |
| 525 | {"umask","Sets file creation mask", builtin_umask}, |
| 526 | {"unset", "Unset environment variable", builtin_unset}, |
| 527 | {".", "Source-in and run commands in a file", builtin_source}, |
| 528 | {"help", "List shell built-in commands", builtin_help}, |
| 529 | {NULL, NULL, NULL} |
| 530 | }; |
| 531 | |
| 532 | static const char *set_cwd(void) |
| 533 | { |
| 534 | if(cwd==unknown) |
| 535 | cwd = NULL; /* xgetcwd(arg) called free(arg) */ |
| 536 | cwd = xgetcwd((char *)cwd); |
| 537 | if (!cwd) |
| 538 | cwd = unknown; |
| 539 | return cwd; |
| 540 | } |
| 541 | |
| 542 | /* built-in 'eval' handler */ |
| 543 | static int builtin_eval(struct child_prog *child) |
| 544 | { |
| 545 | char *str = NULL; |
| 546 | int rcode = EXIT_SUCCESS; |
| 547 | |
| 548 | if (child->argv[1]) { |
| 549 | str = make_string(child->argv + 1); |
| 550 | parse_string_outer(str, FLAG_EXIT_FROM_LOOP | |
| 551 | FLAG_PARSE_SEMICOLON); |
| 552 | free(str); |
| 553 | rcode = last_return_code; |
| 554 | } |
| 555 | return rcode; |
| 556 | } |
| 557 | |
| 558 | /* built-in 'cd <path>' handler */ |
| 559 | static int builtin_cd(struct child_prog *child) |
| 560 | { |
| 561 | char *newdir; |
| 562 | if (child->argv[1] == NULL) |
| 563 | newdir = getenv("HOME"); |
| 564 | else |
| 565 | newdir = child->argv[1]; |
| 566 | if (chdir(newdir)) { |
| 567 | printf("cd: %s: %s\n", newdir, strerror(errno)); |
| 568 | return EXIT_FAILURE; |
| 569 | } |
| 570 | set_cwd(); |
| 571 | return EXIT_SUCCESS; |
| 572 | } |
| 573 | |
| 574 | /* built-in 'env' handler */ |
| 575 | static int builtin_env(struct child_prog *dummy) |
| 576 | { |
| 577 | char **e = environ; |
| 578 | if (e == NULL) return EXIT_FAILURE; |
| 579 | for (; *e; e++) { |
| 580 | puts(*e); |
| 581 | } |
| 582 | return EXIT_SUCCESS; |
| 583 | } |
| 584 | |
| 585 | /* built-in 'exec' handler */ |
| 586 | static int builtin_exec(struct child_prog *child) |
| 587 | { |
| 588 | if (child->argv[1] == NULL) |
| 589 | return EXIT_SUCCESS; /* Really? */ |
| 590 | child->argv++; |
| 591 | pseudo_exec(child); |
| 592 | /* never returns */ |
| 593 | } |
| 594 | |
| 595 | /* built-in 'exit' handler */ |
| 596 | static int builtin_exit(struct child_prog *child) |
| 597 | { |
| 598 | if (child->argv[1] == NULL) |
| 599 | exit(last_return_code); |
| 600 | exit (atoi(child->argv[1])); |
| 601 | } |
| 602 | |
| 603 | /* built-in 'export VAR=value' handler */ |
| 604 | static int builtin_export(struct child_prog *child) |
| 605 | { |
| 606 | int res = 0; |
| 607 | char *name = child->argv[1]; |
| 608 | |
| 609 | if (name == NULL) { |
| 610 | return (builtin_env(child)); |
| 611 | } |
| 612 | |
| 613 | name = strdup(name); |
| 614 | |
| 615 | if(name) { |
| 616 | char *value = strchr(name, '='); |
| 617 | |
| 618 | if (!value) { |
| 619 | char *tmp; |
| 620 | /* They are exporting something without an =VALUE */ |
| 621 | |
| 622 | value = get_local_var(name); |
| 623 | if (value) { |
| 624 | size_t ln = strlen(name); |
| 625 | |
| 626 | tmp = realloc(name, ln+strlen(value)+2); |
| 627 | if(tmp==NULL) |
| 628 | res = -1; |
| 629 | else { |
| 630 | sprintf(tmp+ln, "=%s", value); |
| 631 | name = tmp; |
| 632 | } |
| 633 | } else { |
| 634 | /* bash does not return an error when trying to export |
| 635 | * an undefined variable. Do likewise. */ |
| 636 | res = 1; |
| 637 | } |
| 638 | } |
| 639 | } |
| 640 | if (res<0) |
| 641 | perror_msg("export"); |
| 642 | else if(res==0) |
| 643 | res = set_local_var(name, 1); |
| 644 | else |
| 645 | res = 0; |
| 646 | free(name); |
| 647 | return res; |
| 648 | } |
| 649 | |
| 650 | /* built-in 'fg' and 'bg' handler */ |
| 651 | static int builtin_fg_bg(struct child_prog *child) |
| 652 | { |
| 653 | int i, jobnum; |
| 654 | struct pipe *pi=NULL; |
| 655 | |
| 656 | if (!interactive) |
| 657 | return EXIT_FAILURE; |
| 658 | /* If they gave us no args, assume they want the last backgrounded task */ |
| 659 | if (!child->argv[1]) { |
| 660 | for (pi = job_list; pi; pi = pi->next) { |
| 661 | if (pi->jobid == last_jobid) { |
| 662 | break; |
| 663 | } |
| 664 | } |
| 665 | if (!pi) { |
| 666 | error_msg("%s: no current job", child->argv[0]); |
| 667 | return EXIT_FAILURE; |
| 668 | } |
| 669 | } else { |
| 670 | if (sscanf(child->argv[1], "%%%d", &jobnum) != 1) { |
| 671 | error_msg("%s: bad argument '%s'", child->argv[0], child->argv[1]); |
| 672 | return EXIT_FAILURE; |
| 673 | } |
| 674 | for (pi = job_list; pi; pi = pi->next) { |
| 675 | if (pi->jobid == jobnum) { |
| 676 | break; |
| 677 | } |
| 678 | } |
| 679 | if (!pi) { |
| 680 | error_msg("%s: %d: no such job", child->argv[0], jobnum); |
| 681 | return EXIT_FAILURE; |
| 682 | } |
| 683 | } |
| 684 | |
| 685 | if (*child->argv[0] == 'f') { |
| 686 | /* Put the job into the foreground. */ |
| 687 | tcsetpgrp(shell_terminal, pi->pgrp); |
| 688 | } |
| 689 | |
| 690 | /* Restart the processes in the job */ |
| 691 | for (i = 0; i < pi->num_progs; i++) |
| 692 | pi->progs[i].is_stopped = 0; |
| 693 | |
| 694 | if ( (i=kill(- pi->pgrp, SIGCONT)) < 0) { |
| 695 | if (i == ESRCH) { |
| 696 | remove_bg_job(pi); |
| 697 | } else { |
| 698 | perror_msg("kill (SIGCONT)"); |
| 699 | } |
| 700 | } |
| 701 | |
| 702 | pi->stopped_progs = 0; |
| 703 | return EXIT_SUCCESS; |
| 704 | } |
| 705 | |
| 706 | /* built-in 'help' handler */ |
| 707 | static int builtin_help(struct child_prog *dummy) |
| 708 | { |
| 709 | struct built_in_command *x; |
| 710 | |
| 711 | printf("\nBuilt-in commands:\n"); |
| 712 | printf("-------------------\n"); |
| 713 | for (x = bltins; x->cmd; x++) { |
| 714 | if (x->descr==NULL) |
| 715 | continue; |
| 716 | printf("%s\t%s\n", x->cmd, x->descr); |
| 717 | } |
| 718 | printf("\n\n"); |
| 719 | return EXIT_SUCCESS; |
| 720 | } |
| 721 | |
| 722 | /* built-in 'jobs' handler */ |
| 723 | static int builtin_jobs(struct child_prog *child) |
| 724 | { |
| 725 | struct pipe *job; |
| 726 | char *status_string; |
| 727 | |
| 728 | for (job = job_list; job; job = job->next) { |
| 729 | if (job->running_progs == job->stopped_progs) |
| 730 | status_string = "Stopped"; |
| 731 | else |
| 732 | status_string = "Running"; |
| 733 | |
| 734 | printf(JOB_STATUS_FORMAT, job->jobid, status_string, job->text); |
| 735 | } |
| 736 | return EXIT_SUCCESS; |
| 737 | } |
| 738 | |
| 739 | |
| 740 | /* built-in 'pwd' handler */ |
| 741 | static int builtin_pwd(struct child_prog *dummy) |
| 742 | { |
| 743 | puts(set_cwd()); |
| 744 | return EXIT_SUCCESS; |
| 745 | } |
| 746 | |
| 747 | /* built-in 'read VAR' handler */ |
| 748 | static int builtin_read(struct child_prog *child) |
| 749 | { |
| 750 | int res; |
| 751 | |
| 752 | if (child->argv[1]) { |
| 753 | char string[BUFSIZ]; |
| 754 | char *var = 0; |
| 755 | |
| 756 | string[0] = 0; /* In case stdin has only EOF */ |
| 757 | /* read string */ |
| 758 | fgets(string, sizeof(string), stdin); |
| 759 | chomp(string); |
| 760 | var = malloc(strlen(child->argv[1])+strlen(string)+2); |
| 761 | if(var) { |
| 762 | sprintf(var, "%s=%s", child->argv[1], string); |
| 763 | res = set_local_var(var, 0); |
| 764 | } else |
| 765 | res = -1; |
| 766 | if (res) |
| 767 | fprintf(stderr, "read: %m\n"); |
| 768 | free(var); /* So not move up to avoid breaking errno */ |
| 769 | return res; |
| 770 | } else { |
| 771 | do res=getchar(); while(res!='\n' && res!=EOF); |
| 772 | return 0; |
| 773 | } |
| 774 | } |
| 775 | |
| 776 | /* built-in 'set VAR=value' handler */ |
| 777 | static int builtin_set(struct child_prog *child) |
| 778 | { |
| 779 | char *temp = child->argv[1]; |
| 780 | struct variables *e; |
| 781 | |
| 782 | if (temp == NULL) |
| 783 | for(e = top_vars; e; e=e->next) |
| 784 | printf("%s=%s\n", e->name, e->value); |
| 785 | else |
| 786 | set_local_var(temp, 0); |
| 787 | |
| 788 | return EXIT_SUCCESS; |
| 789 | } |
| 790 | |
| 791 | |
| 792 | /* Built-in 'shift' handler */ |
| 793 | static int builtin_shift(struct child_prog *child) |
| 794 | { |
| 795 | int n=1; |
| 796 | if (child->argv[1]) { |
| 797 | n=atoi(child->argv[1]); |
| 798 | } |
| 799 | if (n>=0 && n<global_argc) { |
| 800 | /* XXX This probably breaks $0 */ |
| 801 | global_argc -= n; |
| 802 | global_argv += n; |
| 803 | return EXIT_SUCCESS; |
| 804 | } else { |
| 805 | return EXIT_FAILURE; |
| 806 | } |
| 807 | } |
| 808 | |
| 809 | /* Built-in '.' handler (read-in and execute commands from file) */ |
| 810 | static int builtin_source(struct child_prog *child) |
| 811 | { |
| 812 | FILE *input; |
| 813 | int status; |
| 814 | |
| 815 | if (child->argv[1] == NULL) |
| 816 | return EXIT_FAILURE; |
| 817 | |
| 818 | /* XXX search through $PATH is missing */ |
| 819 | input = fopen(child->argv[1], "r"); |
| 820 | if (!input) { |
| 821 | error_msg("Couldn't open file '%s'", child->argv[1]); |
| 822 | return EXIT_FAILURE; |
| 823 | } |
| 824 | |
| 825 | /* Now run the file */ |
| 826 | /* XXX argv and argc are broken; need to save old global_argv |
| 827 | * (pointer only is OK!) on this stack frame, |
| 828 | * set global_argv=child->argv+1, recurse, and restore. */ |
| 829 | mark_open(fileno(input)); |
| 830 | status = parse_file_outer(input); |
| 831 | mark_closed(fileno(input)); |
| 832 | fclose(input); |
| 833 | return (status); |
| 834 | } |
| 835 | |
| 836 | static int builtin_umask(struct child_prog *child) |
| 837 | { |
| 838 | mode_t new_umask; |
| 839 | const char *arg = child->argv[1]; |
| 840 | char *end; |
| 841 | if (arg) { |
| 842 | new_umask=strtoul(arg, &end, 8); |
| 843 | if (*end!='\0' || end == arg) { |
| 844 | return EXIT_FAILURE; |
| 845 | } |
| 846 | } else { |
| 847 | printf("%.3o\n", (unsigned int) (new_umask=umask(0))); |
| 848 | } |
| 849 | umask(new_umask); |
| 850 | return EXIT_SUCCESS; |
| 851 | } |
| 852 | |
| 853 | /* built-in 'unset VAR' handler */ |
| 854 | static int builtin_unset(struct child_prog *child) |
| 855 | { |
| 856 | /* bash returned already true */ |
| 857 | unset_local_var(child->argv[1]); |
| 858 | return EXIT_SUCCESS; |
| 859 | } |
| 860 | |
| 861 | static int builtin_not_written(struct child_prog *child) |
| 862 | { |
| 863 | printf("builtin_%s not written\n",child->argv[0]); |
| 864 | return EXIT_FAILURE; |
| 865 | } |
| 866 | #endif |
| 867 | |
| 868 | static int b_check_space(o_string *o, int len) |
| 869 | { |
| 870 | /* It would be easy to drop a more restrictive policy |
| 871 | * in here, such as setting a maximum string length */ |
| 872 | if (o->length + len > o->maxlen) { |
| 873 | char *old_data = o->data; |
| 874 | /* assert (data == NULL || o->maxlen != 0); */ |
| 875 | o->maxlen += max(2*len, B_CHUNK); |
| 876 | o->data = realloc(o->data, 1 + o->maxlen); |
| 877 | if (o->data == NULL) { |
| 878 | free(old_data); |
| 879 | } |
| 880 | } |
| 881 | return o->data == NULL; |
| 882 | } |
| 883 | |
| 884 | static int b_addchr(o_string *o, int ch) |
| 885 | { |
| 886 | debug_printf("b_addchr: %c %d %p\n", ch, o->length, o); |
| 887 | if (b_check_space(o, 1)) return B_NOSPAC; |
| 888 | o->data[o->length] = ch; |
| 889 | o->length++; |
| 890 | o->data[o->length] = '\0'; |
| 891 | return 0; |
| 892 | } |
| 893 | |
| 894 | static void b_reset(o_string *o) |
| 895 | { |
| 896 | o->length = 0; |
| 897 | o->nonnull = 0; |
| 898 | if (o->data != NULL) *o->data = '\0'; |
| 899 | } |
| 900 | |
| 901 | static void b_free(o_string *o) |
| 902 | { |
| 903 | b_reset(o); |
wdenk | e7f34c6 | 2003-01-11 09:48:40 +0000 | [diff] [blame] | 904 | free(o->data); |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 905 | o->data = NULL; |
| 906 | o->maxlen = 0; |
| 907 | } |
| 908 | |
| 909 | /* My analysis of quoting semantics tells me that state information |
| 910 | * is associated with a destination, not a source. |
| 911 | */ |
| 912 | static int b_addqchr(o_string *o, int ch, int quote) |
| 913 | { |
| 914 | if (quote && strchr("*?[\\",ch)) { |
| 915 | int rc; |
| 916 | rc = b_addchr(o, '\\'); |
| 917 | if (rc) return rc; |
| 918 | } |
| 919 | return b_addchr(o, ch); |
| 920 | } |
| 921 | |
wdenk | 6203e40 | 2004-04-18 10:13:26 +0000 | [diff] [blame] | 922 | #ifndef __U_BOOT__ |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 923 | static int b_adduint(o_string *o, unsigned int i) |
| 924 | { |
| 925 | int r; |
| 926 | char *p = simple_itoa(i); |
| 927 | /* no escape checking necessary */ |
| 928 | do r=b_addchr(o, *p++); while (r==0 && *p); |
| 929 | return r; |
| 930 | } |
wdenk | 6203e40 | 2004-04-18 10:13:26 +0000 | [diff] [blame] | 931 | #endif |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 932 | |
| 933 | static int static_get(struct in_str *i) |
| 934 | { |
Wolfgang Denk | dc770c7 | 2008-07-14 15:19:07 +0200 | [diff] [blame] | 935 | int ch = *i->p++; |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 936 | if (ch=='\0') return EOF; |
| 937 | return ch; |
| 938 | } |
| 939 | |
| 940 | static int static_peek(struct in_str *i) |
| 941 | { |
| 942 | return *i->p; |
| 943 | } |
| 944 | |
| 945 | #ifndef __U_BOOT__ |
| 946 | static inline void cmdedit_set_initial_prompt(void) |
| 947 | { |
wdenk | e7f34c6 | 2003-01-11 09:48:40 +0000 | [diff] [blame] | 948 | #ifndef CONFIG_FEATURE_SH_FANCY_PROMPT |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 949 | PS1 = NULL; |
| 950 | #else |
| 951 | PS1 = getenv("PS1"); |
| 952 | if(PS1==0) |
| 953 | PS1 = "\\w \\$ "; |
| 954 | #endif |
| 955 | } |
| 956 | |
| 957 | static inline void setup_prompt_string(int promptmode, char **prompt_str) |
| 958 | { |
| 959 | debug_printf("setup_prompt_string %d ",promptmode); |
wdenk | e7f34c6 | 2003-01-11 09:48:40 +0000 | [diff] [blame] | 960 | #ifndef CONFIG_FEATURE_SH_FANCY_PROMPT |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 961 | /* Set up the prompt */ |
| 962 | if (promptmode == 1) { |
wdenk | e7f34c6 | 2003-01-11 09:48:40 +0000 | [diff] [blame] | 963 | free(PS1); |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 964 | PS1=xmalloc(strlen(cwd)+4); |
| 965 | sprintf(PS1, "%s %s", cwd, ( geteuid() != 0 ) ? "$ ":"# "); |
| 966 | *prompt_str = PS1; |
| 967 | } else { |
| 968 | *prompt_str = PS2; |
| 969 | } |
| 970 | #else |
| 971 | *prompt_str = (promptmode==1)? PS1 : PS2; |
| 972 | #endif |
| 973 | debug_printf("result %s\n",*prompt_str); |
| 974 | } |
| 975 | #endif |
| 976 | |
| 977 | static void get_user_input(struct in_str *i) |
| 978 | { |
| 979 | #ifndef __U_BOOT__ |
| 980 | char *prompt_str; |
| 981 | static char the_command[BUFSIZ]; |
| 982 | |
| 983 | setup_prompt_string(i->promptmode, &prompt_str); |
wdenk | e7f34c6 | 2003-01-11 09:48:40 +0000 | [diff] [blame] | 984 | #ifdef CONFIG_FEATURE_COMMAND_EDITING |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 985 | /* |
| 986 | ** enable command line editing only while a command line |
| 987 | ** is actually being read; otherwise, we'll end up bequeathing |
| 988 | ** atexit() handlers and other unwanted stuff to our |
| 989 | ** child processes (rob@sysgo.de) |
| 990 | */ |
| 991 | cmdedit_read_input(prompt_str, the_command); |
| 992 | #else |
| 993 | fputs(prompt_str, stdout); |
| 994 | fflush(stdout); |
| 995 | the_command[0]=fgetc(i->file); |
| 996 | the_command[1]='\0'; |
| 997 | #endif |
| 998 | fflush(stdout); |
| 999 | i->p = the_command; |
| 1000 | #else |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 1001 | int n; |
Kristian Otnes | 2a262cd | 2014-04-25 15:35:43 +0200 | [diff] [blame] | 1002 | static char the_command[CONFIG_SYS_CBSIZE + 1]; |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 1003 | |
Simon Glass | 09007c4 | 2014-04-10 20:01:31 -0600 | [diff] [blame] | 1004 | bootretry_reset_cmd_timeout(); |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 1005 | i->__promptme = 1; |
| 1006 | if (i->promptmode == 1) { |
Simon Glass | be6aafc | 2014-04-10 20:01:27 -0600 | [diff] [blame] | 1007 | n = cli_readline(CONFIG_SYS_PROMPT); |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 1008 | } else { |
Simon Glass | be6aafc | 2014-04-10 20:01:27 -0600 | [diff] [blame] | 1009 | n = cli_readline(CONFIG_SYS_PROMPT_HUSH_PS2); |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 1010 | } |
Wolfgang Denk | 2b7976a | 2005-08-12 23:34:51 +0200 | [diff] [blame] | 1011 | #ifdef CONFIG_BOOT_RETRY_TIME |
| 1012 | if (n == -2) { |
| 1013 | puts("\nTimeout waiting for command\n"); |
| 1014 | # ifdef CONFIG_RESET_TO_RETRY |
| 1015 | do_reset(NULL, 0, 0, NULL); |
| 1016 | # else |
| 1017 | # error "This currently only works with CONFIG_RESET_TO_RETRY enabled" |
| 1018 | # endif |
| 1019 | } |
| 1020 | #endif |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 1021 | if (n == -1 ) { |
| 1022 | flag_repeat = 0; |
| 1023 | i->__promptme = 0; |
| 1024 | } |
| 1025 | n = strlen(console_buffer); |
| 1026 | console_buffer[n] = '\n'; |
| 1027 | console_buffer[n+1]= '\0'; |
| 1028 | if (had_ctrlc()) flag_repeat = 0; |
| 1029 | clear_ctrlc(); |
| 1030 | do_repeat = 0; |
| 1031 | if (i->promptmode == 1) { |
| 1032 | if (console_buffer[0] == '\n'&& flag_repeat == 0) { |
| 1033 | strcpy(the_command,console_buffer); |
| 1034 | } |
| 1035 | else { |
| 1036 | if (console_buffer[0] != '\n') { |
| 1037 | strcpy(the_command,console_buffer); |
| 1038 | flag_repeat = 1; |
| 1039 | } |
| 1040 | else { |
| 1041 | do_repeat = 1; |
| 1042 | } |
| 1043 | } |
| 1044 | i->p = the_command; |
| 1045 | } |
| 1046 | else { |
wdenk | 57b2d80 | 2003-06-27 21:31:46 +0000 | [diff] [blame] | 1047 | if (console_buffer[0] != '\n') { |
| 1048 | if (strlen(the_command) + strlen(console_buffer) |
Jean-Christophe PLAGNIOL-VILLARD | 0383694 | 2008-10-16 15:01:15 +0200 | [diff] [blame] | 1049 | < CONFIG_SYS_CBSIZE) { |
wdenk | 57b2d80 | 2003-06-27 21:31:46 +0000 | [diff] [blame] | 1050 | n = strlen(the_command); |
| 1051 | the_command[n-1] = ' '; |
| 1052 | strcpy(&the_command[n],console_buffer); |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 1053 | } |
| 1054 | else { |
| 1055 | the_command[0] = '\n'; |
| 1056 | the_command[1] = '\0'; |
| 1057 | flag_repeat = 0; |
| 1058 | } |
| 1059 | } |
| 1060 | if (i->__promptme == 0) { |
| 1061 | the_command[0] = '\n'; |
| 1062 | the_command[1] = '\0'; |
| 1063 | } |
| 1064 | i->p = console_buffer; |
| 1065 | } |
| 1066 | #endif |
| 1067 | } |
| 1068 | |
| 1069 | /* This is the magic location that prints prompts |
| 1070 | * and gets data back from the user */ |
| 1071 | static int file_get(struct in_str *i) |
| 1072 | { |
| 1073 | int ch; |
| 1074 | |
| 1075 | ch = 0; |
| 1076 | /* If there is data waiting, eat it up */ |
| 1077 | if (i->p && *i->p) { |
Wolfgang Denk | dc770c7 | 2008-07-14 15:19:07 +0200 | [diff] [blame] | 1078 | ch = *i->p++; |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 1079 | } else { |
| 1080 | /* need to double check i->file because we might be doing something |
| 1081 | * more complicated by now, like sourcing or substituting. */ |
| 1082 | #ifndef __U_BOOT__ |
| 1083 | if (i->__promptme && interactive && i->file == stdin) { |
| 1084 | while(! i->p || (interactive && strlen(i->p)==0) ) { |
| 1085 | #else |
| 1086 | while(! i->p || strlen(i->p)==0 ) { |
| 1087 | #endif |
| 1088 | get_user_input(i); |
| 1089 | } |
| 1090 | i->promptmode=2; |
| 1091 | #ifndef __U_BOOT__ |
| 1092 | i->__promptme = 0; |
| 1093 | #endif |
| 1094 | if (i->p && *i->p) { |
Wolfgang Denk | dc770c7 | 2008-07-14 15:19:07 +0200 | [diff] [blame] | 1095 | ch = *i->p++; |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 1096 | } |
| 1097 | #ifndef __U_BOOT__ |
| 1098 | } else { |
| 1099 | ch = fgetc(i->file); |
| 1100 | } |
| 1101 | |
| 1102 | #endif |
| 1103 | debug_printf("b_getch: got a %d\n", ch); |
| 1104 | } |
| 1105 | #ifndef __U_BOOT__ |
| 1106 | if (ch == '\n') i->__promptme=1; |
| 1107 | #endif |
| 1108 | return ch; |
| 1109 | } |
| 1110 | |
| 1111 | /* All the callers guarantee this routine will never be |
| 1112 | * used right after a newline, so prompting is not needed. |
| 1113 | */ |
| 1114 | static int file_peek(struct in_str *i) |
| 1115 | { |
| 1116 | #ifndef __U_BOOT__ |
| 1117 | if (i->p && *i->p) { |
| 1118 | #endif |
| 1119 | return *i->p; |
| 1120 | #ifndef __U_BOOT__ |
| 1121 | } else { |
| 1122 | i->peek_buf[0] = fgetc(i->file); |
| 1123 | i->peek_buf[1] = '\0'; |
| 1124 | i->p = i->peek_buf; |
| 1125 | debug_printf("b_peek: got a %d\n", *i->p); |
| 1126 | return *i->p; |
| 1127 | } |
| 1128 | #endif |
| 1129 | } |
| 1130 | |
| 1131 | #ifndef __U_BOOT__ |
| 1132 | static void setup_file_in_str(struct in_str *i, FILE *f) |
| 1133 | #else |
| 1134 | static void setup_file_in_str(struct in_str *i) |
| 1135 | #endif |
| 1136 | { |
| 1137 | i->peek = file_peek; |
| 1138 | i->get = file_get; |
| 1139 | i->__promptme=1; |
| 1140 | i->promptmode=1; |
| 1141 | #ifndef __U_BOOT__ |
| 1142 | i->file = f; |
| 1143 | #endif |
| 1144 | i->p = NULL; |
| 1145 | } |
| 1146 | |
| 1147 | static void setup_string_in_str(struct in_str *i, const char *s) |
| 1148 | { |
| 1149 | i->peek = static_peek; |
| 1150 | i->get = static_get; |
| 1151 | i->__promptme=1; |
| 1152 | i->promptmode=1; |
| 1153 | i->p = s; |
| 1154 | } |
| 1155 | |
| 1156 | #ifndef __U_BOOT__ |
| 1157 | static void mark_open(int fd) |
| 1158 | { |
| 1159 | struct close_me *new = xmalloc(sizeof(struct close_me)); |
| 1160 | new->fd = fd; |
| 1161 | new->next = close_me_head; |
| 1162 | close_me_head = new; |
| 1163 | } |
| 1164 | |
| 1165 | static void mark_closed(int fd) |
| 1166 | { |
| 1167 | struct close_me *tmp; |
| 1168 | if (close_me_head == NULL || close_me_head->fd != fd) |
| 1169 | error_msg_and_die("corrupt close_me"); |
| 1170 | tmp = close_me_head; |
| 1171 | close_me_head = close_me_head->next; |
| 1172 | free(tmp); |
| 1173 | } |
| 1174 | |
wdenk | e7f34c6 | 2003-01-11 09:48:40 +0000 | [diff] [blame] | 1175 | static void close_all(void) |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 1176 | { |
| 1177 | struct close_me *c; |
| 1178 | for (c=close_me_head; c; c=c->next) { |
| 1179 | close(c->fd); |
| 1180 | } |
| 1181 | close_me_head = NULL; |
| 1182 | } |
| 1183 | |
| 1184 | /* squirrel != NULL means we squirrel away copies of stdin, stdout, |
| 1185 | * and stderr if they are redirected. */ |
| 1186 | static int setup_redirects(struct child_prog *prog, int squirrel[]) |
| 1187 | { |
| 1188 | int openfd, mode; |
| 1189 | struct redir_struct *redir; |
| 1190 | |
| 1191 | for (redir=prog->redirects; redir; redir=redir->next) { |
| 1192 | if (redir->dup == -1 && redir->word.gl_pathv == NULL) { |
| 1193 | /* something went wrong in the parse. Pretend it didn't happen */ |
| 1194 | continue; |
| 1195 | } |
| 1196 | if (redir->dup == -1) { |
| 1197 | mode=redir_table[redir->type].mode; |
| 1198 | openfd = open(redir->word.gl_pathv[0], mode, 0666); |
| 1199 | if (openfd < 0) { |
| 1200 | /* this could get lost if stderr has been redirected, but |
| 1201 | bash and ash both lose it as well (though zsh doesn't!) */ |
| 1202 | perror_msg("error opening %s", redir->word.gl_pathv[0]); |
| 1203 | return 1; |
| 1204 | } |
| 1205 | } else { |
| 1206 | openfd = redir->dup; |
| 1207 | } |
| 1208 | |
| 1209 | if (openfd != redir->fd) { |
| 1210 | if (squirrel && redir->fd < 3) { |
| 1211 | squirrel[redir->fd] = dup(redir->fd); |
| 1212 | } |
| 1213 | if (openfd == -3) { |
| 1214 | close(openfd); |
| 1215 | } else { |
| 1216 | dup2(openfd, redir->fd); |
| 1217 | if (redir->dup == -1) |
| 1218 | close (openfd); |
| 1219 | } |
| 1220 | } |
| 1221 | } |
| 1222 | return 0; |
| 1223 | } |
| 1224 | |
| 1225 | static void restore_redirects(int squirrel[]) |
| 1226 | { |
| 1227 | int i, fd; |
| 1228 | for (i=0; i<3; i++) { |
| 1229 | fd = squirrel[i]; |
| 1230 | if (fd != -1) { |
| 1231 | /* No error checking. I sure wouldn't know what |
| 1232 | * to do with an error if I found one! */ |
| 1233 | dup2(fd, i); |
| 1234 | close(fd); |
| 1235 | } |
| 1236 | } |
| 1237 | } |
| 1238 | |
| 1239 | /* never returns */ |
| 1240 | /* XXX no exit() here. If you don't exec, use _exit instead. |
| 1241 | * The at_exit handlers apparently confuse the calling process, |
| 1242 | * in particular stdin handling. Not sure why? */ |
| 1243 | static void pseudo_exec(struct child_prog *child) |
| 1244 | { |
| 1245 | int i, rcode; |
| 1246 | char *p; |
| 1247 | struct built_in_command *x; |
| 1248 | if (child->argv) { |
| 1249 | for (i=0; is_assignment(child->argv[i]); i++) { |
| 1250 | debug_printf("pid %d environment modification: %s\n",getpid(),child->argv[i]); |
| 1251 | p = insert_var_value(child->argv[i]); |
| 1252 | putenv(strdup(p)); |
| 1253 | if (p != child->argv[i]) free(p); |
| 1254 | } |
| 1255 | child->argv+=i; /* XXX this hack isn't so horrible, since we are about |
wdenk | 57b2d80 | 2003-06-27 21:31:46 +0000 | [diff] [blame] | 1256 | to exit, and therefore don't need to keep data |
| 1257 | structures consistent for free() use. */ |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 1258 | /* If a variable is assigned in a forest, and nobody listens, |
| 1259 | * was it ever really set? |
| 1260 | */ |
| 1261 | if (child->argv[0] == NULL) { |
| 1262 | _exit(EXIT_SUCCESS); |
| 1263 | } |
| 1264 | |
| 1265 | /* |
| 1266 | * Check if the command matches any of the builtins. |
| 1267 | * Depending on context, this might be redundant. But it's |
| 1268 | * easier to waste a few CPU cycles than it is to figure out |
| 1269 | * if this is one of those cases. |
| 1270 | */ |
| 1271 | for (x = bltins; x->cmd; x++) { |
| 1272 | if (strcmp(child->argv[0], x->cmd) == 0 ) { |
| 1273 | debug_printf("builtin exec %s\n", child->argv[0]); |
| 1274 | rcode = x->function(child); |
| 1275 | fflush(stdout); |
| 1276 | _exit(rcode); |
| 1277 | } |
| 1278 | } |
| 1279 | |
| 1280 | /* Check if the command matches any busybox internal commands |
| 1281 | * ("applets") here. |
| 1282 | * FIXME: This feature is not 100% safe, since |
| 1283 | * BusyBox is not fully reentrant, so we have no guarantee the things |
| 1284 | * from the .bss are still zeroed, or that things from .data are still |
| 1285 | * at their defaults. We could exec ourself from /proc/self/exe, but I |
| 1286 | * really dislike relying on /proc for things. We could exec ourself |
| 1287 | * from global_argv[0], but if we are in a chroot, we may not be able |
| 1288 | * to find ourself... */ |
wdenk | e7f34c6 | 2003-01-11 09:48:40 +0000 | [diff] [blame] | 1289 | #ifdef CONFIG_FEATURE_SH_STANDALONE_SHELL |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 1290 | { |
| 1291 | int argc_l; |
| 1292 | char** argv_l=child->argv; |
| 1293 | char *name = child->argv[0]; |
| 1294 | |
wdenk | e7f34c6 | 2003-01-11 09:48:40 +0000 | [diff] [blame] | 1295 | #ifdef CONFIG_FEATURE_SH_APPLETS_ALWAYS_WIN |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 1296 | /* Following discussions from November 2000 on the busybox mailing |
| 1297 | * list, the default configuration, (without |
| 1298 | * get_last_path_component()) lets the user force use of an |
| 1299 | * external command by specifying the full (with slashes) filename. |
wdenk | e7f34c6 | 2003-01-11 09:48:40 +0000 | [diff] [blame] | 1300 | * If you enable CONFIG_FEATURE_SH_APPLETS_ALWAYS_WIN then applets |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 1301 | * _aways_ override external commands, so if you want to run |
| 1302 | * /bin/cat, it will use BusyBox cat even if /bin/cat exists on the |
| 1303 | * filesystem and is _not_ busybox. Some systems may want this, |
| 1304 | * most do not. */ |
| 1305 | name = get_last_path_component(name); |
| 1306 | #endif |
| 1307 | /* Count argc for use in a second... */ |
| 1308 | for(argc_l=0;*argv_l!=NULL; argv_l++, argc_l++); |
| 1309 | optind = 1; |
| 1310 | debug_printf("running applet %s\n", name); |
| 1311 | run_applet_by_name(name, argc_l, child->argv); |
| 1312 | } |
| 1313 | #endif |
| 1314 | debug_printf("exec of %s\n",child->argv[0]); |
| 1315 | execvp(child->argv[0],child->argv); |
| 1316 | perror_msg("couldn't exec: %s",child->argv[0]); |
| 1317 | _exit(1); |
| 1318 | } else if (child->group) { |
| 1319 | debug_printf("runtime nesting to group\n"); |
| 1320 | interactive=0; /* crucial!!!! */ |
| 1321 | rcode = run_list_real(child->group); |
| 1322 | /* OK to leak memory by not calling free_pipe_list, |
| 1323 | * since this process is about to exit */ |
| 1324 | _exit(rcode); |
| 1325 | } else { |
| 1326 | /* Can happen. See what bash does with ">foo" by itself. */ |
| 1327 | debug_printf("trying to pseudo_exec null command\n"); |
| 1328 | _exit(EXIT_SUCCESS); |
| 1329 | } |
| 1330 | } |
| 1331 | |
| 1332 | static void insert_bg_job(struct pipe *pi) |
| 1333 | { |
| 1334 | struct pipe *thejob; |
| 1335 | |
| 1336 | /* Linear search for the ID of the job to use */ |
| 1337 | pi->jobid = 1; |
| 1338 | for (thejob = job_list; thejob; thejob = thejob->next) |
| 1339 | if (thejob->jobid >= pi->jobid) |
| 1340 | pi->jobid = thejob->jobid + 1; |
| 1341 | |
| 1342 | /* add thejob to the list of running jobs */ |
| 1343 | if (!job_list) { |
| 1344 | thejob = job_list = xmalloc(sizeof(*thejob)); |
| 1345 | } else { |
| 1346 | for (thejob = job_list; thejob->next; thejob = thejob->next) /* nothing */; |
| 1347 | thejob->next = xmalloc(sizeof(*thejob)); |
| 1348 | thejob = thejob->next; |
| 1349 | } |
| 1350 | |
| 1351 | /* physically copy the struct job */ |
| 1352 | memcpy(thejob, pi, sizeof(struct pipe)); |
| 1353 | thejob->next = NULL; |
| 1354 | thejob->running_progs = thejob->num_progs; |
| 1355 | thejob->stopped_progs = 0; |
| 1356 | thejob->text = xmalloc(BUFSIZ); /* cmdedit buffer size */ |
| 1357 | |
| 1358 | /*if (pi->progs[0] && pi->progs[0].argv && pi->progs[0].argv[0]) */ |
| 1359 | { |
| 1360 | char *bar=thejob->text; |
| 1361 | char **foo=pi->progs[0].argv; |
| 1362 | while(foo && *foo) { |
| 1363 | bar += sprintf(bar, "%s ", *foo++); |
| 1364 | } |
| 1365 | } |
| 1366 | |
| 1367 | /* we don't wait for background thejobs to return -- append it |
| 1368 | to the list of backgrounded thejobs and leave it alone */ |
| 1369 | printf("[%d] %d\n", thejob->jobid, thejob->progs[0].pid); |
| 1370 | last_bg_pid = thejob->progs[0].pid; |
| 1371 | last_jobid = thejob->jobid; |
| 1372 | } |
| 1373 | |
| 1374 | /* remove a backgrounded job */ |
| 1375 | static void remove_bg_job(struct pipe *pi) |
| 1376 | { |
| 1377 | struct pipe *prev_pipe; |
| 1378 | |
| 1379 | if (pi == job_list) { |
| 1380 | job_list = pi->next; |
| 1381 | } else { |
| 1382 | prev_pipe = job_list; |
| 1383 | while (prev_pipe->next != pi) |
| 1384 | prev_pipe = prev_pipe->next; |
| 1385 | prev_pipe->next = pi->next; |
| 1386 | } |
| 1387 | if (job_list) |
| 1388 | last_jobid = job_list->jobid; |
| 1389 | else |
| 1390 | last_jobid = 0; |
| 1391 | |
| 1392 | pi->stopped_progs = 0; |
| 1393 | free_pipe(pi, 0); |
| 1394 | free(pi); |
| 1395 | } |
| 1396 | |
| 1397 | /* Checks to see if any processes have exited -- if they |
| 1398 | have, figure out why and see if a job has completed */ |
| 1399 | static int checkjobs(struct pipe* fg_pipe) |
| 1400 | { |
| 1401 | int attributes; |
| 1402 | int status; |
| 1403 | int prognum = 0; |
| 1404 | struct pipe *pi; |
| 1405 | pid_t childpid; |
| 1406 | |
| 1407 | attributes = WUNTRACED; |
| 1408 | if (fg_pipe==NULL) { |
| 1409 | attributes |= WNOHANG; |
| 1410 | } |
| 1411 | |
| 1412 | while ((childpid = waitpid(-1, &status, attributes)) > 0) { |
| 1413 | if (fg_pipe) { |
| 1414 | int i, rcode = 0; |
| 1415 | for (i=0; i < fg_pipe->num_progs; i++) { |
| 1416 | if (fg_pipe->progs[i].pid == childpid) { |
| 1417 | if (i==fg_pipe->num_progs-1) |
| 1418 | rcode=WEXITSTATUS(status); |
| 1419 | (fg_pipe->num_progs)--; |
| 1420 | return(rcode); |
| 1421 | } |
| 1422 | } |
| 1423 | } |
| 1424 | |
| 1425 | for (pi = job_list; pi; pi = pi->next) { |
| 1426 | prognum = 0; |
| 1427 | while (prognum < pi->num_progs && pi->progs[prognum].pid != childpid) { |
| 1428 | prognum++; |
| 1429 | } |
| 1430 | if (prognum < pi->num_progs) |
| 1431 | break; |
| 1432 | } |
| 1433 | |
| 1434 | if(pi==NULL) { |
| 1435 | debug_printf("checkjobs: pid %d was not in our list!\n", childpid); |
| 1436 | continue; |
| 1437 | } |
| 1438 | |
| 1439 | if (WIFEXITED(status) || WIFSIGNALED(status)) { |
| 1440 | /* child exited */ |
| 1441 | pi->running_progs--; |
| 1442 | pi->progs[prognum].pid = 0; |
| 1443 | |
| 1444 | if (!pi->running_progs) { |
| 1445 | printf(JOB_STATUS_FORMAT, pi->jobid, "Done", pi->text); |
| 1446 | remove_bg_job(pi); |
| 1447 | } |
| 1448 | } else { |
| 1449 | /* child stopped */ |
| 1450 | pi->stopped_progs++; |
| 1451 | pi->progs[prognum].is_stopped = 1; |
| 1452 | |
| 1453 | #if 0 |
| 1454 | /* Printing this stuff is a pain, since it tends to |
| 1455 | * overwrite the prompt an inconveinient moments. So |
| 1456 | * don't do that. */ |
| 1457 | if (pi->stopped_progs == pi->num_progs) { |
| 1458 | printf("\n"JOB_STATUS_FORMAT, pi->jobid, "Stopped", pi->text); |
| 1459 | } |
| 1460 | #endif |
| 1461 | } |
| 1462 | } |
| 1463 | |
| 1464 | if (childpid == -1 && errno != ECHILD) |
| 1465 | perror_msg("waitpid"); |
| 1466 | |
| 1467 | /* move the shell to the foreground */ |
| 1468 | /*if (interactive && tcsetpgrp(shell_terminal, getpgid(0))) */ |
| 1469 | /* perror_msg("tcsetpgrp-2"); */ |
| 1470 | return -1; |
| 1471 | } |
| 1472 | |
| 1473 | /* Figure out our controlling tty, checking in order stderr, |
| 1474 | * stdin, and stdout. If check_pgrp is set, also check that |
| 1475 | * we belong to the foreground process group associated with |
| 1476 | * that tty. The value of shell_terminal is needed in order to call |
| 1477 | * tcsetpgrp(shell_terminal, ...); */ |
| 1478 | void controlling_tty(int check_pgrp) |
| 1479 | { |
| 1480 | pid_t curpgrp; |
| 1481 | |
| 1482 | if ((curpgrp = tcgetpgrp(shell_terminal = 2)) < 0 |
| 1483 | && (curpgrp = tcgetpgrp(shell_terminal = 0)) < 0 |
| 1484 | && (curpgrp = tcgetpgrp(shell_terminal = 1)) < 0) |
| 1485 | goto shell_terminal_error; |
| 1486 | |
| 1487 | if (check_pgrp && curpgrp != getpgid(0)) |
| 1488 | goto shell_terminal_error; |
| 1489 | |
| 1490 | return; |
| 1491 | |
| 1492 | shell_terminal_error: |
| 1493 | shell_terminal = -1; |
| 1494 | return; |
| 1495 | } |
| 1496 | #endif |
| 1497 | |
| 1498 | /* run_pipe_real() starts all the jobs, but doesn't wait for anything |
| 1499 | * to finish. See checkjobs(). |
| 1500 | * |
| 1501 | * return code is normally -1, when the caller has to wait for children |
| 1502 | * to finish to determine the exit status of the pipe. If the pipe |
| 1503 | * is a simple builtin command, however, the action is done by the |
| 1504 | * time run_pipe_real returns, and the exit code is provided as the |
| 1505 | * return value. |
| 1506 | * |
| 1507 | * The input of the pipe is always stdin, the output is always |
| 1508 | * stdout. The outpipe[] mechanism in BusyBox-0.48 lash is bogus, |
| 1509 | * because it tries to avoid running the command substitution in |
| 1510 | * subshell, when that is in fact necessary. The subshell process |
| 1511 | * now has its stdout directed to the input of the appropriate pipe, |
| 1512 | * so this routine is noticeably simpler. |
| 1513 | */ |
| 1514 | static int run_pipe_real(struct pipe *pi) |
| 1515 | { |
| 1516 | int i; |
| 1517 | #ifndef __U_BOOT__ |
| 1518 | int nextin, nextout; |
| 1519 | int pipefds[2]; /* pipefds[0] is for reading */ |
| 1520 | struct child_prog *child; |
| 1521 | struct built_in_command *x; |
| 1522 | char *p; |
wdenk | e7f34c6 | 2003-01-11 09:48:40 +0000 | [diff] [blame] | 1523 | # if __GNUC__ |
| 1524 | /* Avoid longjmp clobbering */ |
| 1525 | (void) &i; |
| 1526 | (void) &nextin; |
| 1527 | (void) &nextout; |
| 1528 | (void) &child; |
| 1529 | # endif |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 1530 | #else |
| 1531 | int nextin; |
| 1532 | int flag = do_repeat ? CMD_FLAG_REPEAT : 0; |
| 1533 | struct child_prog *child; |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 1534 | char *p; |
wdenk | e7f34c6 | 2003-01-11 09:48:40 +0000 | [diff] [blame] | 1535 | # if __GNUC__ |
| 1536 | /* Avoid longjmp clobbering */ |
| 1537 | (void) &i; |
| 1538 | (void) &nextin; |
| 1539 | (void) &child; |
| 1540 | # endif |
| 1541 | #endif /* __U_BOOT__ */ |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 1542 | |
| 1543 | nextin = 0; |
| 1544 | #ifndef __U_BOOT__ |
| 1545 | pi->pgrp = -1; |
| 1546 | #endif |
| 1547 | |
| 1548 | /* Check if this is a simple builtin (not part of a pipe). |
| 1549 | * Builtins within pipes have to fork anyway, and are handled in |
| 1550 | * pseudo_exec. "echo foo | read bar" doesn't work on bash, either. |
| 1551 | */ |
| 1552 | if (pi->num_progs == 1) child = & (pi->progs[0]); |
| 1553 | #ifndef __U_BOOT__ |
| 1554 | if (pi->num_progs == 1 && child->group && child->subshell == 0) { |
| 1555 | int squirrel[] = {-1, -1, -1}; |
| 1556 | int rcode; |
| 1557 | debug_printf("non-subshell grouping\n"); |
| 1558 | setup_redirects(child, squirrel); |
| 1559 | /* XXX could we merge code with following builtin case, |
| 1560 | * by creating a pseudo builtin that calls run_list_real? */ |
| 1561 | rcode = run_list_real(child->group); |
| 1562 | restore_redirects(squirrel); |
| 1563 | #else |
| 1564 | if (pi->num_progs == 1 && child->group) { |
| 1565 | int rcode; |
| 1566 | debug_printf("non-subshell grouping\n"); |
| 1567 | rcode = run_list_real(child->group); |
| 1568 | #endif |
| 1569 | return rcode; |
| 1570 | } else if (pi->num_progs == 1 && pi->progs[0].argv != NULL) { |
| 1571 | for (i=0; is_assignment(child->argv[i]); i++) { /* nothing */ } |
| 1572 | if (i!=0 && child->argv[i]==NULL) { |
| 1573 | /* assignments, but no command: set the local environment */ |
| 1574 | for (i=0; child->argv[i]!=NULL; i++) { |
| 1575 | |
| 1576 | /* Ok, this case is tricky. We have to decide if this is a |
| 1577 | * local variable, or an already exported variable. If it is |
| 1578 | * already exported, we have to export the new value. If it is |
| 1579 | * not exported, we need only set this as a local variable. |
| 1580 | * This junk is all to decide whether or not to export this |
| 1581 | * variable. */ |
| 1582 | int export_me=0; |
| 1583 | char *name, *value; |
| 1584 | name = xstrdup(child->argv[i]); |
| 1585 | debug_printf("Local environment set: %s\n", name); |
| 1586 | value = strchr(name, '='); |
| 1587 | if (value) |
| 1588 | *value=0; |
| 1589 | #ifndef __U_BOOT__ |
| 1590 | if ( get_local_var(name)) { |
| 1591 | export_me=1; |
| 1592 | } |
| 1593 | #endif |
| 1594 | free(name); |
| 1595 | p = insert_var_value(child->argv[i]); |
| 1596 | set_local_var(p, export_me); |
| 1597 | if (p != child->argv[i]) free(p); |
| 1598 | } |
| 1599 | return EXIT_SUCCESS; /* don't worry about errors in set_local_var() yet */ |
| 1600 | } |
| 1601 | for (i = 0; is_assignment(child->argv[i]); i++) { |
| 1602 | p = insert_var_value(child->argv[i]); |
| 1603 | #ifndef __U_BOOT__ |
| 1604 | putenv(strdup(p)); |
| 1605 | #else |
| 1606 | set_local_var(p, 0); |
| 1607 | #endif |
| 1608 | if (p != child->argv[i]) { |
| 1609 | child->sp--; |
| 1610 | free(p); |
| 1611 | } |
| 1612 | } |
| 1613 | if (child->sp) { |
| 1614 | char * str = NULL; |
| 1615 | |
Stephen Warren | 60c38c9 | 2014-03-01 22:16:10 -0700 | [diff] [blame] | 1616 | str = make_string(child->argv + i, |
| 1617 | child->argv_nonnull + i); |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 1618 | parse_string_outer(str, FLAG_EXIT_FROM_LOOP | FLAG_REPARSING); |
| 1619 | free(str); |
| 1620 | return last_return_code; |
| 1621 | } |
| 1622 | #ifndef __U_BOOT__ |
| 1623 | for (x = bltins; x->cmd; x++) { |
| 1624 | if (strcmp(child->argv[i], x->cmd) == 0 ) { |
| 1625 | int squirrel[] = {-1, -1, -1}; |
| 1626 | int rcode; |
| 1627 | if (x->function == builtin_exec && child->argv[i+1]==NULL) { |
| 1628 | debug_printf("magic exec\n"); |
| 1629 | setup_redirects(child,NULL); |
| 1630 | return EXIT_SUCCESS; |
| 1631 | } |
| 1632 | debug_printf("builtin inline %s\n", child->argv[0]); |
| 1633 | /* XXX setup_redirects acts on file descriptors, not FILEs. |
| 1634 | * This is perfect for work that comes after exec(). |
| 1635 | * Is it really safe for inline use? Experimentally, |
| 1636 | * things seem to work with glibc. */ |
| 1637 | setup_redirects(child, squirrel); |
Simon Glass | e79731e | 2011-12-06 19:47:53 +0000 | [diff] [blame] | 1638 | |
| 1639 | child->argv += i; /* XXX horrible hack */ |
| 1640 | rcode = x->function(child); |
| 1641 | /* XXX restore hack so free() can work right */ |
| 1642 | child->argv -= i; |
| 1643 | restore_redirects(squirrel); |
| 1644 | } |
| 1645 | return rcode; |
| 1646 | } |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 1647 | #else |
Simon Glass | 1727b94 | 2012-02-14 19:59:25 +0000 | [diff] [blame] | 1648 | /* check ";", because ,example , argv consist from |
| 1649 | * "help;flinfo" must not execute |
| 1650 | */ |
| 1651 | if (strchr(child->argv[i], ';')) { |
| 1652 | printf("Unknown command '%s' - try 'help' or use " |
| 1653 | "'run' command\n", child->argv[i]); |
| 1654 | return -1; |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 1655 | } |
Simon Glass | 1727b94 | 2012-02-14 19:59:25 +0000 | [diff] [blame] | 1656 | /* Process the command */ |
| 1657 | return cmd_process(flag, child->argc, child->argv, |
Richard Genoud | 94ff067 | 2012-12-03 06:28:28 +0000 | [diff] [blame] | 1658 | &flag_repeat, NULL); |
Simon Glass | 1727b94 | 2012-02-14 19:59:25 +0000 | [diff] [blame] | 1659 | #endif |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 1660 | } |
Simon Glass | 1727b94 | 2012-02-14 19:59:25 +0000 | [diff] [blame] | 1661 | #ifndef __U_BOOT__ |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 1662 | |
| 1663 | for (i = 0; i < pi->num_progs; i++) { |
| 1664 | child = & (pi->progs[i]); |
| 1665 | |
| 1666 | /* pipes are inserted between pairs of commands */ |
| 1667 | if ((i + 1) < pi->num_progs) { |
| 1668 | if (pipe(pipefds)<0) perror_msg_and_die("pipe"); |
| 1669 | nextout = pipefds[1]; |
| 1670 | } else { |
| 1671 | nextout=1; |
| 1672 | pipefds[0] = -1; |
| 1673 | } |
| 1674 | |
| 1675 | /* XXX test for failed fork()? */ |
| 1676 | if (!(child->pid = fork())) { |
| 1677 | /* Set the handling for job control signals back to the default. */ |
| 1678 | signal(SIGINT, SIG_DFL); |
| 1679 | signal(SIGQUIT, SIG_DFL); |
| 1680 | signal(SIGTERM, SIG_DFL); |
| 1681 | signal(SIGTSTP, SIG_DFL); |
| 1682 | signal(SIGTTIN, SIG_DFL); |
| 1683 | signal(SIGTTOU, SIG_DFL); |
| 1684 | signal(SIGCHLD, SIG_DFL); |
| 1685 | |
| 1686 | close_all(); |
| 1687 | |
| 1688 | if (nextin != 0) { |
| 1689 | dup2(nextin, 0); |
| 1690 | close(nextin); |
| 1691 | } |
| 1692 | if (nextout != 1) { |
| 1693 | dup2(nextout, 1); |
| 1694 | close(nextout); |
| 1695 | } |
| 1696 | if (pipefds[0]!=-1) { |
| 1697 | close(pipefds[0]); /* opposite end of our output pipe */ |
| 1698 | } |
| 1699 | |
| 1700 | /* Like bash, explicit redirects override pipes, |
| 1701 | * and the pipe fd is available for dup'ing. */ |
| 1702 | setup_redirects(child,NULL); |
| 1703 | |
| 1704 | if (interactive && pi->followup!=PIPE_BG) { |
| 1705 | /* If we (the child) win the race, put ourselves in the process |
| 1706 | * group whose leader is the first process in this pipe. */ |
| 1707 | if (pi->pgrp < 0) { |
| 1708 | pi->pgrp = getpid(); |
| 1709 | } |
| 1710 | if (setpgid(0, pi->pgrp) == 0) { |
| 1711 | tcsetpgrp(2, pi->pgrp); |
| 1712 | } |
| 1713 | } |
| 1714 | |
| 1715 | pseudo_exec(child); |
| 1716 | } |
| 1717 | |
| 1718 | |
| 1719 | /* put our child in the process group whose leader is the |
| 1720 | first process in this pipe */ |
| 1721 | if (pi->pgrp < 0) { |
| 1722 | pi->pgrp = child->pid; |
| 1723 | } |
| 1724 | /* Don't check for errors. The child may be dead already, |
| 1725 | * in which case setpgid returns error code EACCES. */ |
| 1726 | setpgid(child->pid, pi->pgrp); |
| 1727 | |
| 1728 | if (nextin != 0) |
| 1729 | close(nextin); |
| 1730 | if (nextout != 1) |
| 1731 | close(nextout); |
| 1732 | |
| 1733 | /* If there isn't another process, nextin is garbage |
| 1734 | but it doesn't matter */ |
| 1735 | nextin = pipefds[0]; |
| 1736 | } |
| 1737 | #endif |
| 1738 | return -1; |
| 1739 | } |
| 1740 | |
| 1741 | static int run_list_real(struct pipe *pi) |
| 1742 | { |
| 1743 | char *save_name = NULL; |
| 1744 | char **list = NULL; |
| 1745 | char **save_list = NULL; |
| 1746 | struct pipe *rpipe; |
| 1747 | int flag_rep = 0; |
| 1748 | #ifndef __U_BOOT__ |
| 1749 | int save_num_progs; |
| 1750 | #endif |
| 1751 | int rcode=0, flag_skip=1; |
| 1752 | int flag_restore = 0; |
| 1753 | int if_code=0, next_if_code=0; /* need double-buffer to handle elif */ |
| 1754 | reserved_style rmode, skip_more_in_this_rmode=RES_XXXX; |
| 1755 | /* check syntax for "for" */ |
| 1756 | for (rpipe = pi; rpipe; rpipe = rpipe->next) { |
| 1757 | if ((rpipe->r_mode == RES_IN || |
| 1758 | rpipe->r_mode == RES_FOR) && |
| 1759 | (rpipe->next == NULL)) { |
| 1760 | syntax(); |
| 1761 | #ifdef __U_BOOT__ |
| 1762 | flag_repeat = 0; |
| 1763 | #endif |
| 1764 | return 1; |
| 1765 | } |
| 1766 | if ((rpipe->r_mode == RES_IN && |
| 1767 | (rpipe->next->r_mode == RES_IN && |
| 1768 | rpipe->next->progs->argv != NULL))|| |
| 1769 | (rpipe->r_mode == RES_FOR && |
| 1770 | rpipe->next->r_mode != RES_IN)) { |
| 1771 | syntax(); |
| 1772 | #ifdef __U_BOOT__ |
| 1773 | flag_repeat = 0; |
| 1774 | #endif |
| 1775 | return 1; |
| 1776 | } |
| 1777 | } |
| 1778 | for (; pi; pi = (flag_restore != 0) ? rpipe : pi->next) { |
| 1779 | if (pi->r_mode == RES_WHILE || pi->r_mode == RES_UNTIL || |
| 1780 | pi->r_mode == RES_FOR) { |
| 1781 | #ifdef __U_BOOT__ |
| 1782 | /* check Ctrl-C */ |
| 1783 | ctrlc(); |
| 1784 | if ((had_ctrlc())) { |
| 1785 | return 1; |
| 1786 | } |
| 1787 | #endif |
| 1788 | flag_restore = 0; |
| 1789 | if (!rpipe) { |
| 1790 | flag_rep = 0; |
| 1791 | rpipe = pi; |
| 1792 | } |
| 1793 | } |
| 1794 | rmode = pi->r_mode; |
| 1795 | 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); |
| 1796 | if (rmode == skip_more_in_this_rmode && flag_skip) { |
| 1797 | if (pi->followup == PIPE_SEQ) flag_skip=0; |
| 1798 | continue; |
| 1799 | } |
| 1800 | flag_skip = 1; |
| 1801 | skip_more_in_this_rmode = RES_XXXX; |
| 1802 | if (rmode == RES_THEN || rmode == RES_ELSE) if_code = next_if_code; |
| 1803 | if (rmode == RES_THEN && if_code) continue; |
| 1804 | if (rmode == RES_ELSE && !if_code) continue; |
wdenk | 3359105 | 2004-04-12 14:31:43 +0000 | [diff] [blame] | 1805 | if (rmode == RES_ELIF && !if_code) break; |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 1806 | if (rmode == RES_FOR && pi->num_progs) { |
| 1807 | if (!list) { |
| 1808 | /* if no variable values after "in" we skip "for" */ |
| 1809 | if (!pi->next->progs->argv) continue; |
| 1810 | /* create list of variable values */ |
| 1811 | list = make_list_in(pi->next->progs->argv, |
| 1812 | pi->progs->argv[0]); |
| 1813 | save_list = list; |
| 1814 | save_name = pi->progs->argv[0]; |
| 1815 | pi->progs->argv[0] = NULL; |
| 1816 | flag_rep = 1; |
| 1817 | } |
| 1818 | if (!(*list)) { |
| 1819 | free(pi->progs->argv[0]); |
| 1820 | free(save_list); |
| 1821 | list = NULL; |
| 1822 | flag_rep = 0; |
| 1823 | pi->progs->argv[0] = save_name; |
| 1824 | #ifndef __U_BOOT__ |
| 1825 | pi->progs->glob_result.gl_pathv[0] = |
| 1826 | pi->progs->argv[0]; |
| 1827 | #endif |
| 1828 | continue; |
| 1829 | } else { |
| 1830 | /* insert new value from list for variable */ |
| 1831 | if (pi->progs->argv[0]) |
| 1832 | free(pi->progs->argv[0]); |
| 1833 | pi->progs->argv[0] = *list++; |
| 1834 | #ifndef __U_BOOT__ |
| 1835 | pi->progs->glob_result.gl_pathv[0] = |
| 1836 | pi->progs->argv[0]; |
| 1837 | #endif |
| 1838 | } |
| 1839 | } |
| 1840 | if (rmode == RES_IN) continue; |
| 1841 | if (rmode == RES_DO) { |
| 1842 | if (!flag_rep) continue; |
| 1843 | } |
Jeroen Hofstee | 95ab0d3 | 2014-06-11 00:28:47 +0200 | [diff] [blame] | 1844 | if (rmode == RES_DONE) { |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 1845 | if (flag_rep) { |
| 1846 | flag_restore = 1; |
| 1847 | } else { |
| 1848 | rpipe = NULL; |
| 1849 | } |
| 1850 | } |
| 1851 | if (pi->num_progs == 0) continue; |
| 1852 | #ifndef __U_BOOT__ |
| 1853 | save_num_progs = pi->num_progs; /* save number of programs */ |
| 1854 | #endif |
| 1855 | rcode = run_pipe_real(pi); |
| 1856 | debug_printf("run_pipe_real returned %d\n",rcode); |
| 1857 | #ifndef __U_BOOT__ |
| 1858 | if (rcode!=-1) { |
| 1859 | /* We only ran a builtin: rcode was set by the return value |
| 1860 | * of run_pipe_real(), and we don't need to wait for anything. */ |
| 1861 | } else if (pi->followup==PIPE_BG) { |
| 1862 | /* XXX check bash's behavior with nontrivial pipes */ |
| 1863 | /* XXX compute jobid */ |
| 1864 | /* XXX what does bash do with attempts to background builtins? */ |
| 1865 | insert_bg_job(pi); |
| 1866 | rcode = EXIT_SUCCESS; |
| 1867 | } else { |
| 1868 | if (interactive) { |
| 1869 | /* move the new process group into the foreground */ |
| 1870 | if (tcsetpgrp(shell_terminal, pi->pgrp) && errno != ENOTTY) |
| 1871 | perror_msg("tcsetpgrp-3"); |
| 1872 | rcode = checkjobs(pi); |
| 1873 | /* move the shell to the foreground */ |
| 1874 | if (tcsetpgrp(shell_terminal, getpgid(0)) && errno != ENOTTY) |
| 1875 | perror_msg("tcsetpgrp-4"); |
| 1876 | } else { |
| 1877 | rcode = checkjobs(pi); |
| 1878 | } |
| 1879 | debug_printf("checkjobs returned %d\n",rcode); |
| 1880 | } |
| 1881 | last_return_code=rcode; |
| 1882 | #else |
wdenk | 6203e40 | 2004-04-18 10:13:26 +0000 | [diff] [blame] | 1883 | if (rcode < -1) { |
| 1884 | last_return_code = -rcode - 2; |
| 1885 | return -2; /* exit */ |
| 1886 | } |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 1887 | last_return_code=(rcode == 0) ? 0 : 1; |
| 1888 | #endif |
| 1889 | #ifndef __U_BOOT__ |
| 1890 | pi->num_progs = save_num_progs; /* restore number of programs */ |
| 1891 | #endif |
| 1892 | if ( rmode == RES_IF || rmode == RES_ELIF ) |
| 1893 | next_if_code=rcode; /* can be overwritten a number of times */ |
| 1894 | if (rmode == RES_WHILE) |
| 1895 | flag_rep = !last_return_code; |
| 1896 | if (rmode == RES_UNTIL) |
| 1897 | flag_rep = last_return_code; |
| 1898 | if ( (rcode==EXIT_SUCCESS && pi->followup==PIPE_OR) || |
| 1899 | (rcode!=EXIT_SUCCESS && pi->followup==PIPE_AND) ) |
| 1900 | skip_more_in_this_rmode=rmode; |
| 1901 | #ifndef __U_BOOT__ |
| 1902 | checkjobs(NULL); |
| 1903 | #endif |
| 1904 | } |
| 1905 | return rcode; |
| 1906 | } |
| 1907 | |
| 1908 | /* broken, of course, but OK for testing */ |
| 1909 | static char *indenter(int i) |
| 1910 | { |
| 1911 | static char blanks[]=" "; |
| 1912 | return &blanks[sizeof(blanks)-i-1]; |
| 1913 | } |
| 1914 | |
| 1915 | /* return code is the exit status of the pipe */ |
| 1916 | static int free_pipe(struct pipe *pi, int indent) |
| 1917 | { |
| 1918 | char **p; |
| 1919 | struct child_prog *child; |
| 1920 | #ifndef __U_BOOT__ |
| 1921 | struct redir_struct *r, *rnext; |
| 1922 | #endif |
| 1923 | int a, i, ret_code=0; |
| 1924 | char *ind = indenter(indent); |
| 1925 | |
| 1926 | #ifndef __U_BOOT__ |
| 1927 | if (pi->stopped_progs > 0) |
| 1928 | return ret_code; |
| 1929 | final_printf("%s run pipe: (pid %d)\n",ind,getpid()); |
| 1930 | #endif |
| 1931 | for (i=0; i<pi->num_progs; i++) { |
| 1932 | child = &pi->progs[i]; |
| 1933 | final_printf("%s command %d:\n",ind,i); |
| 1934 | if (child->argv) { |
| 1935 | for (a=0,p=child->argv; *p; a++,p++) { |
| 1936 | final_printf("%s argv[%d] = %s\n",ind,a,*p); |
| 1937 | } |
| 1938 | #ifndef __U_BOOT__ |
| 1939 | globfree(&child->glob_result); |
| 1940 | #else |
Peter Tyser | cc215a1 | 2009-08-05 16:18:44 -0500 | [diff] [blame] | 1941 | for (a = 0; a < child->argc; a++) { |
wdenk | 57b2d80 | 2003-06-27 21:31:46 +0000 | [diff] [blame] | 1942 | free(child->argv[a]); |
| 1943 | } |
Stephen Warren | 60c38c9 | 2014-03-01 22:16:10 -0700 | [diff] [blame] | 1944 | free(child->argv); |
| 1945 | free(child->argv_nonnull); |
wdenk | 57b2d80 | 2003-06-27 21:31:46 +0000 | [diff] [blame] | 1946 | child->argc = 0; |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 1947 | #endif |
| 1948 | child->argv=NULL; |
| 1949 | } else if (child->group) { |
| 1950 | #ifndef __U_BOOT__ |
| 1951 | final_printf("%s begin group (subshell:%d)\n",ind, child->subshell); |
| 1952 | #endif |
| 1953 | ret_code = free_pipe_list(child->group,indent+3); |
| 1954 | final_printf("%s end group\n",ind); |
| 1955 | } else { |
| 1956 | final_printf("%s (nil)\n",ind); |
| 1957 | } |
| 1958 | #ifndef __U_BOOT__ |
| 1959 | for (r=child->redirects; r; r=rnext) { |
| 1960 | final_printf("%s redirect %d%s", ind, r->fd, redir_table[r->type].descrip); |
| 1961 | if (r->dup == -1) { |
| 1962 | /* guard against the case >$FOO, where foo is unset or blank */ |
| 1963 | if (r->word.gl_pathv) { |
| 1964 | final_printf(" %s\n", *r->word.gl_pathv); |
| 1965 | globfree(&r->word); |
| 1966 | } |
| 1967 | } else { |
| 1968 | final_printf("&%d\n", r->dup); |
| 1969 | } |
| 1970 | rnext=r->next; |
| 1971 | free(r); |
| 1972 | } |
| 1973 | child->redirects=NULL; |
| 1974 | #endif |
| 1975 | } |
| 1976 | free(pi->progs); /* children are an array, they get freed all at once */ |
| 1977 | pi->progs=NULL; |
| 1978 | return ret_code; |
| 1979 | } |
| 1980 | |
| 1981 | static int free_pipe_list(struct pipe *head, int indent) |
| 1982 | { |
| 1983 | int rcode=0; /* if list has no members */ |
| 1984 | struct pipe *pi, *next; |
| 1985 | char *ind = indenter(indent); |
| 1986 | for (pi=head; pi; pi=next) { |
| 1987 | final_printf("%s pipe reserved mode %d\n", ind, pi->r_mode); |
| 1988 | rcode = free_pipe(pi, indent); |
| 1989 | final_printf("%s pipe followup code %d\n", ind, pi->followup); |
| 1990 | next=pi->next; |
| 1991 | pi->next=NULL; |
| 1992 | free(pi); |
| 1993 | } |
| 1994 | return rcode; |
| 1995 | } |
| 1996 | |
| 1997 | /* Select which version we will use */ |
| 1998 | static int run_list(struct pipe *pi) |
| 1999 | { |
| 2000 | int rcode=0; |
| 2001 | #ifndef __U_BOOT__ |
| 2002 | if (fake_mode==0) { |
| 2003 | #endif |
| 2004 | rcode = run_list_real(pi); |
| 2005 | #ifndef __U_BOOT__ |
| 2006 | } |
| 2007 | #endif |
| 2008 | /* free_pipe_list has the side effect of clearing memory |
| 2009 | * In the long run that function can be merged with run_list_real, |
| 2010 | * but doing that now would hobble the debugging effort. */ |
| 2011 | free_pipe_list(pi,0); |
| 2012 | return rcode; |
| 2013 | } |
| 2014 | |
| 2015 | /* The API for glob is arguably broken. This routine pushes a non-matching |
| 2016 | * string into the output structure, removing non-backslashed backslashes. |
| 2017 | * If someone can prove me wrong, by performing this function within the |
| 2018 | * original glob(3) api, feel free to rewrite this routine into oblivion. |
| 2019 | * Return code (0 vs. GLOB_NOSPACE) matches glob(3). |
| 2020 | * XXX broken if the last character is '\\', check that before calling. |
| 2021 | */ |
| 2022 | #ifndef __U_BOOT__ |
| 2023 | static int globhack(const char *src, int flags, glob_t *pglob) |
| 2024 | { |
| 2025 | int cnt=0, pathc; |
| 2026 | const char *s; |
| 2027 | char *dest; |
| 2028 | for (cnt=1, s=src; s && *s; s++) { |
| 2029 | if (*s == '\\') s++; |
| 2030 | cnt++; |
| 2031 | } |
| 2032 | dest = malloc(cnt); |
| 2033 | if (!dest) return GLOB_NOSPACE; |
| 2034 | if (!(flags & GLOB_APPEND)) { |
| 2035 | pglob->gl_pathv=NULL; |
| 2036 | pglob->gl_pathc=0; |
| 2037 | pglob->gl_offs=0; |
| 2038 | pglob->gl_offs=0; |
| 2039 | } |
| 2040 | pathc = ++pglob->gl_pathc; |
| 2041 | pglob->gl_pathv = realloc(pglob->gl_pathv, (pathc+1)*sizeof(*pglob->gl_pathv)); |
| 2042 | if (pglob->gl_pathv == NULL) return GLOB_NOSPACE; |
| 2043 | pglob->gl_pathv[pathc-1]=dest; |
| 2044 | pglob->gl_pathv[pathc]=NULL; |
| 2045 | for (s=src; s && *s; s++, dest++) { |
| 2046 | if (*s == '\\') s++; |
| 2047 | *dest = *s; |
| 2048 | } |
| 2049 | *dest='\0'; |
| 2050 | return 0; |
| 2051 | } |
| 2052 | |
| 2053 | /* XXX broken if the last character is '\\', check that before calling */ |
| 2054 | static int glob_needed(const char *s) |
| 2055 | { |
| 2056 | for (; *s; s++) { |
| 2057 | if (*s == '\\') s++; |
| 2058 | if (strchr("*[?",*s)) return 1; |
| 2059 | } |
| 2060 | return 0; |
| 2061 | } |
| 2062 | |
| 2063 | #if 0 |
| 2064 | static void globprint(glob_t *pglob) |
| 2065 | { |
| 2066 | int i; |
| 2067 | debug_printf("glob_t at %p:\n", pglob); |
| 2068 | debug_printf(" gl_pathc=%d gl_pathv=%p gl_offs=%d gl_flags=%d\n", |
| 2069 | pglob->gl_pathc, pglob->gl_pathv, pglob->gl_offs, pglob->gl_flags); |
| 2070 | for (i=0; i<pglob->gl_pathc; i++) |
| 2071 | debug_printf("pglob->gl_pathv[%d] = %p = %s\n", i, |
| 2072 | pglob->gl_pathv[i], pglob->gl_pathv[i]); |
| 2073 | } |
| 2074 | #endif |
| 2075 | |
| 2076 | static int xglob(o_string *dest, int flags, glob_t *pglob) |
| 2077 | { |
| 2078 | int gr; |
| 2079 | |
wdenk | 57b2d80 | 2003-06-27 21:31:46 +0000 | [diff] [blame] | 2080 | /* short-circuit for null word */ |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 2081 | /* we can code this better when the debug_printf's are gone */ |
wdenk | 57b2d80 | 2003-06-27 21:31:46 +0000 | [diff] [blame] | 2082 | if (dest->length == 0) { |
| 2083 | if (dest->nonnull) { |
| 2084 | /* bash man page calls this an "explicit" null */ |
| 2085 | gr = globhack(dest->data, flags, pglob); |
| 2086 | debug_printf("globhack returned %d\n",gr); |
| 2087 | } else { |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 2088 | return 0; |
| 2089 | } |
wdenk | 57b2d80 | 2003-06-27 21:31:46 +0000 | [diff] [blame] | 2090 | } else if (glob_needed(dest->data)) { |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 2091 | gr = glob(dest->data, flags, NULL, pglob); |
| 2092 | debug_printf("glob returned %d\n",gr); |
| 2093 | if (gr == GLOB_NOMATCH) { |
| 2094 | /* quote removal, or more accurately, backslash removal */ |
| 2095 | gr = globhack(dest->data, flags, pglob); |
| 2096 | debug_printf("globhack returned %d\n",gr); |
| 2097 | } |
| 2098 | } else { |
| 2099 | gr = globhack(dest->data, flags, pglob); |
| 2100 | debug_printf("globhack returned %d\n",gr); |
| 2101 | } |
| 2102 | if (gr == GLOB_NOSPACE) |
| 2103 | error_msg_and_die("out of memory during glob"); |
| 2104 | if (gr != 0) { /* GLOB_ABORTED ? */ |
| 2105 | error_msg("glob(3) error %d",gr); |
| 2106 | } |
| 2107 | /* globprint(glob_target); */ |
| 2108 | return gr; |
| 2109 | } |
| 2110 | #endif |
| 2111 | |
wdenk | 6203e40 | 2004-04-18 10:13:26 +0000 | [diff] [blame] | 2112 | #ifdef __U_BOOT__ |
| 2113 | static char *get_dollar_var(char ch); |
| 2114 | #endif |
| 2115 | |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 2116 | /* This is used to get/check local shell variables */ |
Holger Brunck | 5095022 | 2011-04-08 02:47:42 +0000 | [diff] [blame] | 2117 | char *get_local_var(const char *s) |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 2118 | { |
| 2119 | struct variables *cur; |
| 2120 | |
| 2121 | if (!s) |
| 2122 | return NULL; |
wdenk | 6203e40 | 2004-04-18 10:13:26 +0000 | [diff] [blame] | 2123 | |
| 2124 | #ifdef __U_BOOT__ |
| 2125 | if (*s == '$') |
| 2126 | return get_dollar_var(s[1]); |
| 2127 | #endif |
| 2128 | |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 2129 | for (cur = top_vars; cur; cur=cur->next) |
| 2130 | if(strcmp(cur->name, s)==0) |
| 2131 | return cur->value; |
| 2132 | return NULL; |
| 2133 | } |
| 2134 | |
| 2135 | /* This is used to set local shell variables |
| 2136 | flg_export==0 if only local (not exporting) variable |
| 2137 | flg_export==1 if "new" exporting environ |
| 2138 | flg_export>1 if current startup environ (not call putenv()) */ |
Heiko Schocher | 49ebcb5 | 2008-10-15 09:40:28 +0200 | [diff] [blame] | 2139 | int set_local_var(const char *s, int flg_export) |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 2140 | { |
| 2141 | char *name, *value; |
| 2142 | int result=0; |
| 2143 | struct variables *cur; |
| 2144 | |
wdenk | 6203e40 | 2004-04-18 10:13:26 +0000 | [diff] [blame] | 2145 | #ifdef __U_BOOT__ |
| 2146 | /* might be possible! */ |
| 2147 | if (!isalpha(*s)) |
| 2148 | return -1; |
| 2149 | #endif |
| 2150 | |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 2151 | name=strdup(s); |
| 2152 | |
| 2153 | #ifdef __U_BOOT__ |
| 2154 | if (getenv(name) != NULL) { |
| 2155 | printf ("ERROR: " |
wdenk | 2ebee31 | 2004-02-23 19:30:57 +0000 | [diff] [blame] | 2156 | "There is a global environment variable with the same name.\n"); |
wdenk | 6203e40 | 2004-04-18 10:13:26 +0000 | [diff] [blame] | 2157 | free(name); |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 2158 | return -1; |
| 2159 | } |
| 2160 | #endif |
| 2161 | /* Assume when we enter this function that we are already in |
| 2162 | * NAME=VALUE format. So the first order of business is to |
| 2163 | * split 's' on the '=' into 'name' and 'value' */ |
| 2164 | value = strchr(name, '='); |
Kim Phillips | b052b60 | 2012-10-29 13:34:32 +0000 | [diff] [blame] | 2165 | if (value == NULL && ++value == NULL) { |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 2166 | free(name); |
| 2167 | return -1; |
| 2168 | } |
| 2169 | *value++ = 0; |
| 2170 | |
| 2171 | for(cur = top_vars; cur; cur = cur->next) { |
| 2172 | if(strcmp(cur->name, name)==0) |
| 2173 | break; |
| 2174 | } |
| 2175 | |
| 2176 | if(cur) { |
| 2177 | if(strcmp(cur->value, value)==0) { |
| 2178 | if(flg_export>0 && cur->flg_export==0) |
| 2179 | cur->flg_export=flg_export; |
| 2180 | else |
| 2181 | result++; |
| 2182 | } else { |
| 2183 | if(cur->flg_read_only) { |
| 2184 | error_msg("%s: readonly variable", name); |
| 2185 | result = -1; |
| 2186 | } else { |
| 2187 | if(flg_export>0 || cur->flg_export>1) |
| 2188 | cur->flg_export=1; |
| 2189 | free(cur->value); |
| 2190 | |
| 2191 | cur->value = strdup(value); |
| 2192 | } |
| 2193 | } |
| 2194 | } else { |
| 2195 | cur = malloc(sizeof(struct variables)); |
| 2196 | if(!cur) { |
| 2197 | result = -1; |
| 2198 | } else { |
| 2199 | cur->name = strdup(name); |
Kim Phillips | b052b60 | 2012-10-29 13:34:32 +0000 | [diff] [blame] | 2200 | if (cur->name == NULL) { |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 2201 | free(cur); |
| 2202 | result = -1; |
| 2203 | } else { |
| 2204 | struct variables *bottom = top_vars; |
| 2205 | cur->value = strdup(value); |
Kim Phillips | b052b60 | 2012-10-29 13:34:32 +0000 | [diff] [blame] | 2206 | cur->next = NULL; |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 2207 | cur->flg_export = flg_export; |
| 2208 | cur->flg_read_only = 0; |
| 2209 | while(bottom->next) bottom=bottom->next; |
| 2210 | bottom->next = cur; |
| 2211 | } |
| 2212 | } |
| 2213 | } |
| 2214 | |
| 2215 | #ifndef __U_BOOT__ |
| 2216 | if(result==0 && cur->flg_export==1) { |
| 2217 | *(value-1) = '='; |
| 2218 | result = putenv(name); |
| 2219 | } else { |
| 2220 | #endif |
| 2221 | free(name); |
| 2222 | #ifndef __U_BOOT__ |
| 2223 | if(result>0) /* equivalent to previous set */ |
| 2224 | result = 0; |
| 2225 | } |
| 2226 | #endif |
| 2227 | return result; |
| 2228 | } |
| 2229 | |
Heiko Schocher | 49ebcb5 | 2008-10-15 09:40:28 +0200 | [diff] [blame] | 2230 | void unset_local_var(const char *name) |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 2231 | { |
| 2232 | struct variables *cur; |
| 2233 | |
| 2234 | if (name) { |
| 2235 | for (cur = top_vars; cur; cur=cur->next) { |
| 2236 | if(strcmp(cur->name, name)==0) |
| 2237 | break; |
| 2238 | } |
Kim Phillips | b052b60 | 2012-10-29 13:34:32 +0000 | [diff] [blame] | 2239 | if (cur != NULL) { |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 2240 | struct variables *next = top_vars; |
| 2241 | if(cur->flg_read_only) { |
| 2242 | error_msg("%s: readonly variable", name); |
| 2243 | return; |
| 2244 | } else { |
Heiko Schocher | 49ebcb5 | 2008-10-15 09:40:28 +0200 | [diff] [blame] | 2245 | #ifndef __U_BOOT__ |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 2246 | if(cur->flg_export) |
| 2247 | unsetenv(cur->name); |
Heiko Schocher | 49ebcb5 | 2008-10-15 09:40:28 +0200 | [diff] [blame] | 2248 | #endif |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 2249 | free(cur->name); |
| 2250 | free(cur->value); |
| 2251 | while (next->next != cur) |
| 2252 | next = next->next; |
| 2253 | next->next = cur->next; |
| 2254 | } |
| 2255 | free(cur); |
| 2256 | } |
| 2257 | } |
| 2258 | } |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 2259 | |
| 2260 | static int is_assignment(const char *s) |
| 2261 | { |
wdenk | 6203e40 | 2004-04-18 10:13:26 +0000 | [diff] [blame] | 2262 | if (s == NULL) |
| 2263 | return 0; |
| 2264 | |
| 2265 | if (!isalpha(*s)) return 0; |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 2266 | ++s; |
| 2267 | while(isalnum(*s) || *s=='_') ++s; |
| 2268 | return *s=='='; |
| 2269 | } |
| 2270 | |
| 2271 | #ifndef __U_BOOT__ |
| 2272 | /* the src parameter allows us to peek forward to a possible &n syntax |
| 2273 | * for file descriptor duplication, e.g., "2>&1". |
| 2274 | * Return code is 0 normally, 1 if a syntax error is detected in src. |
| 2275 | * Resource errors (in xmalloc) cause the process to exit */ |
| 2276 | static int setup_redirect(struct p_context *ctx, int fd, redir_type style, |
| 2277 | struct in_str *input) |
| 2278 | { |
| 2279 | struct child_prog *child=ctx->child; |
| 2280 | struct redir_struct *redir = child->redirects; |
| 2281 | struct redir_struct *last_redir=NULL; |
| 2282 | |
| 2283 | /* Create a new redir_struct and drop it onto the end of the linked list */ |
| 2284 | while(redir) { |
| 2285 | last_redir=redir; |
| 2286 | redir=redir->next; |
| 2287 | } |
| 2288 | redir = xmalloc(sizeof(struct redir_struct)); |
| 2289 | redir->next=NULL; |
| 2290 | redir->word.gl_pathv=NULL; |
| 2291 | if (last_redir) { |
| 2292 | last_redir->next=redir; |
| 2293 | } else { |
| 2294 | child->redirects=redir; |
| 2295 | } |
| 2296 | |
| 2297 | redir->type=style; |
| 2298 | redir->fd= (fd==-1) ? redir_table[style].default_fd : fd ; |
| 2299 | |
| 2300 | debug_printf("Redirect type %d%s\n", redir->fd, redir_table[style].descrip); |
| 2301 | |
| 2302 | /* Check for a '2>&1' type redirect */ |
| 2303 | redir->dup = redirect_dup_num(input); |
| 2304 | if (redir->dup == -2) return 1; /* syntax error */ |
| 2305 | if (redir->dup != -1) { |
| 2306 | /* Erik had a check here that the file descriptor in question |
| 2307 | * is legit; I postpone that to "run time" |
| 2308 | * A "-" representation of "close me" shows up as a -3 here */ |
| 2309 | debug_printf("Duplicating redirect '%d>&%d'\n", redir->fd, redir->dup); |
| 2310 | } else { |
| 2311 | /* We do _not_ try to open the file that src points to, |
| 2312 | * since we need to return and let src be expanded first. |
| 2313 | * Set ctx->pending_redirect, so we know what to do at the |
| 2314 | * end of the next parsed word. |
| 2315 | */ |
| 2316 | ctx->pending_redirect = redir; |
| 2317 | } |
| 2318 | return 0; |
| 2319 | } |
| 2320 | #endif |
| 2321 | |
Kim Phillips | b052b60 | 2012-10-29 13:34:32 +0000 | [diff] [blame] | 2322 | static struct pipe *new_pipe(void) |
| 2323 | { |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 2324 | struct pipe *pi; |
| 2325 | pi = xmalloc(sizeof(struct pipe)); |
| 2326 | pi->num_progs = 0; |
| 2327 | pi->progs = NULL; |
| 2328 | pi->next = NULL; |
| 2329 | pi->followup = 0; /* invalid */ |
Wolfgang Denk | 00b67fd | 2005-09-28 01:49:47 +0200 | [diff] [blame] | 2330 | pi->r_mode = RES_NONE; |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 2331 | return pi; |
| 2332 | } |
| 2333 | |
| 2334 | static void initialize_context(struct p_context *ctx) |
| 2335 | { |
| 2336 | ctx->pipe=NULL; |
| 2337 | #ifndef __U_BOOT__ |
| 2338 | ctx->pending_redirect=NULL; |
| 2339 | #endif |
| 2340 | ctx->child=NULL; |
| 2341 | ctx->list_head=new_pipe(); |
| 2342 | ctx->pipe=ctx->list_head; |
| 2343 | ctx->w=RES_NONE; |
| 2344 | ctx->stack=NULL; |
| 2345 | #ifdef __U_BOOT__ |
| 2346 | ctx->old_flag=0; |
| 2347 | #endif |
| 2348 | done_command(ctx); /* creates the memory for working child */ |
| 2349 | } |
| 2350 | |
| 2351 | /* normal return is 0 |
| 2352 | * if a reserved word is found, and processed, return 1 |
| 2353 | * should handle if, then, elif, else, fi, for, while, until, do, done. |
| 2354 | * case, function, and select are obnoxious, save those for later. |
| 2355 | */ |
wdenk | b02744a | 2003-04-05 00:53:31 +0000 | [diff] [blame] | 2356 | struct reserved_combo { |
| 2357 | char *literal; |
| 2358 | int code; |
| 2359 | long flag; |
| 2360 | }; |
| 2361 | /* Mostly a list of accepted follow-up reserved words. |
| 2362 | * FLAG_END means we are done with the sequence, and are ready |
| 2363 | * to turn the compound list into a command. |
| 2364 | * FLAG_START means the word must start a new compound list. |
| 2365 | */ |
| 2366 | static struct reserved_combo reserved_list[] = { |
| 2367 | { "if", RES_IF, FLAG_THEN | FLAG_START }, |
| 2368 | { "then", RES_THEN, FLAG_ELIF | FLAG_ELSE | FLAG_FI }, |
| 2369 | { "elif", RES_ELIF, FLAG_THEN }, |
| 2370 | { "else", RES_ELSE, FLAG_FI }, |
| 2371 | { "fi", RES_FI, FLAG_END }, |
| 2372 | { "for", RES_FOR, FLAG_IN | FLAG_START }, |
| 2373 | { "while", RES_WHILE, FLAG_DO | FLAG_START }, |
| 2374 | { "until", RES_UNTIL, FLAG_DO | FLAG_START }, |
| 2375 | { "in", RES_IN, FLAG_DO }, |
| 2376 | { "do", RES_DO, FLAG_DONE }, |
| 2377 | { "done", RES_DONE, FLAG_END } |
| 2378 | }; |
| 2379 | #define NRES (sizeof(reserved_list)/sizeof(struct reserved_combo)) |
| 2380 | |
Kim Phillips | b052b60 | 2012-10-29 13:34:32 +0000 | [diff] [blame] | 2381 | static int reserved_word(o_string *dest, struct p_context *ctx) |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 2382 | { |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 2383 | struct reserved_combo *r; |
| 2384 | for (r=reserved_list; |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 2385 | r<reserved_list+NRES; r++) { |
| 2386 | if (strcmp(dest->data, r->literal) == 0) { |
| 2387 | debug_printf("found reserved word %s, code %d\n",r->literal,r->code); |
| 2388 | if (r->flag & FLAG_START) { |
| 2389 | struct p_context *new = xmalloc(sizeof(struct p_context)); |
| 2390 | debug_printf("push stack\n"); |
| 2391 | if (ctx->w == RES_IN || ctx->w == RES_FOR) { |
| 2392 | syntax(); |
| 2393 | free(new); |
| 2394 | ctx->w = RES_SNTX; |
| 2395 | b_reset(dest); |
| 2396 | return 1; |
| 2397 | } |
| 2398 | *new = *ctx; /* physical copy */ |
| 2399 | initialize_context(ctx); |
| 2400 | ctx->stack=new; |
| 2401 | } else if ( ctx->w == RES_NONE || ! (ctx->old_flag & (1<<r->code))) { |
| 2402 | syntax(); |
| 2403 | ctx->w = RES_SNTX; |
| 2404 | b_reset(dest); |
| 2405 | return 1; |
| 2406 | } |
| 2407 | ctx->w=r->code; |
| 2408 | ctx->old_flag = r->flag; |
| 2409 | if (ctx->old_flag & FLAG_END) { |
| 2410 | struct p_context *old; |
| 2411 | debug_printf("pop stack\n"); |
| 2412 | done_pipe(ctx,PIPE_SEQ); |
| 2413 | old = ctx->stack; |
| 2414 | old->child->group = ctx->list_head; |
| 2415 | #ifndef __U_BOOT__ |
| 2416 | old->child->subshell = 0; |
| 2417 | #endif |
| 2418 | *ctx = *old; /* physical copy */ |
| 2419 | free(old); |
| 2420 | } |
| 2421 | b_reset (dest); |
| 2422 | return 1; |
| 2423 | } |
| 2424 | } |
| 2425 | return 0; |
| 2426 | } |
| 2427 | |
| 2428 | /* normal return is 0. |
| 2429 | * Syntax or xglob errors return 1. */ |
| 2430 | static int done_word(o_string *dest, struct p_context *ctx) |
| 2431 | { |
| 2432 | struct child_prog *child=ctx->child; |
| 2433 | #ifndef __U_BOOT__ |
| 2434 | glob_t *glob_target; |
| 2435 | int gr, flags = 0; |
| 2436 | #else |
| 2437 | char *str, *s; |
| 2438 | int argc, cnt; |
| 2439 | #endif |
| 2440 | |
| 2441 | debug_printf("done_word: %s %p\n", dest->data, child); |
| 2442 | if (dest->length == 0 && !dest->nonnull) { |
| 2443 | debug_printf(" true null, ignored\n"); |
| 2444 | return 0; |
| 2445 | } |
| 2446 | #ifndef __U_BOOT__ |
| 2447 | if (ctx->pending_redirect) { |
| 2448 | glob_target = &ctx->pending_redirect->word; |
| 2449 | } else { |
| 2450 | #endif |
| 2451 | if (child->group) { |
| 2452 | syntax(); |
| 2453 | return 1; /* syntax error, groups and arglists don't mix */ |
| 2454 | } |
| 2455 | if (!child->argv && (ctx->type & FLAG_PARSE_SEMICOLON)) { |
| 2456 | debug_printf("checking %s for reserved-ness\n",dest->data); |
| 2457 | if (reserved_word(dest,ctx)) return ctx->w==RES_SNTX; |
| 2458 | } |
| 2459 | #ifndef __U_BOOT__ |
| 2460 | glob_target = &child->glob_result; |
wdenk | 57b2d80 | 2003-06-27 21:31:46 +0000 | [diff] [blame] | 2461 | if (child->argv) flags |= GLOB_APPEND; |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 2462 | #else |
| 2463 | for (cnt = 1, s = dest->data; s && *s; s++) { |
| 2464 | if (*s == '\\') s++; |
| 2465 | cnt++; |
| 2466 | } |
| 2467 | str = malloc(cnt); |
| 2468 | if (!str) return 1; |
| 2469 | if ( child->argv == NULL) { |
| 2470 | child->argc=0; |
| 2471 | } |
| 2472 | argc = ++child->argc; |
| 2473 | child->argv = realloc(child->argv, (argc+1)*sizeof(*child->argv)); |
| 2474 | if (child->argv == NULL) return 1; |
Stephen Warren | 60c38c9 | 2014-03-01 22:16:10 -0700 | [diff] [blame] | 2475 | child->argv_nonnull = realloc(child->argv_nonnull, |
| 2476 | (argc+1)*sizeof(*child->argv_nonnull)); |
| 2477 | if (child->argv_nonnull == NULL) |
| 2478 | return 1; |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 2479 | child->argv[argc-1]=str; |
Stephen Warren | 60c38c9 | 2014-03-01 22:16:10 -0700 | [diff] [blame] | 2480 | child->argv_nonnull[argc-1] = dest->nonnull; |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 2481 | child->argv[argc]=NULL; |
Stephen Warren | 60c38c9 | 2014-03-01 22:16:10 -0700 | [diff] [blame] | 2482 | child->argv_nonnull[argc] = 0; |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 2483 | for (s = dest->data; s && *s; s++,str++) { |
| 2484 | if (*s == '\\') s++; |
| 2485 | *str = *s; |
| 2486 | } |
| 2487 | *str = '\0'; |
| 2488 | #endif |
| 2489 | #ifndef __U_BOOT__ |
| 2490 | } |
| 2491 | gr = xglob(dest, flags, glob_target); |
| 2492 | if (gr != 0) return 1; |
| 2493 | #endif |
| 2494 | |
| 2495 | b_reset(dest); |
| 2496 | #ifndef __U_BOOT__ |
| 2497 | if (ctx->pending_redirect) { |
| 2498 | ctx->pending_redirect=NULL; |
| 2499 | if (glob_target->gl_pathc != 1) { |
| 2500 | error_msg("ambiguous redirect"); |
| 2501 | return 1; |
| 2502 | } |
| 2503 | } else { |
| 2504 | child->argv = glob_target->gl_pathv; |
| 2505 | } |
| 2506 | #endif |
| 2507 | if (ctx->w == RES_FOR) { |
| 2508 | done_word(dest,ctx); |
| 2509 | done_pipe(ctx,PIPE_SEQ); |
| 2510 | } |
| 2511 | return 0; |
| 2512 | } |
| 2513 | |
| 2514 | /* The only possible error here is out of memory, in which case |
| 2515 | * xmalloc exits. */ |
| 2516 | static int done_command(struct p_context *ctx) |
| 2517 | { |
| 2518 | /* The child is really already in the pipe structure, so |
| 2519 | * advance the pipe counter and make a new, null child. |
| 2520 | * Only real trickiness here is that the uncommitted |
| 2521 | * child structure, to which ctx->child points, is not |
| 2522 | * counted in pi->num_progs. */ |
| 2523 | struct pipe *pi=ctx->pipe; |
| 2524 | struct child_prog *prog=ctx->child; |
| 2525 | |
| 2526 | if (prog && prog->group == NULL |
wdenk | 57b2d80 | 2003-06-27 21:31:46 +0000 | [diff] [blame] | 2527 | && prog->argv == NULL |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 2528 | #ifndef __U_BOOT__ |
wdenk | 57b2d80 | 2003-06-27 21:31:46 +0000 | [diff] [blame] | 2529 | && prog->redirects == NULL) { |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 2530 | #else |
| 2531 | ) { |
| 2532 | #endif |
| 2533 | debug_printf("done_command: skipping null command\n"); |
| 2534 | return 0; |
| 2535 | } else if (prog) { |
| 2536 | pi->num_progs++; |
| 2537 | debug_printf("done_command: num_progs incremented to %d\n",pi->num_progs); |
| 2538 | } else { |
| 2539 | debug_printf("done_command: initializing\n"); |
| 2540 | } |
| 2541 | pi->progs = xrealloc(pi->progs, sizeof(*pi->progs) * (pi->num_progs+1)); |
| 2542 | |
| 2543 | prog = pi->progs + pi->num_progs; |
| 2544 | #ifndef __U_BOOT__ |
| 2545 | prog->redirects = NULL; |
| 2546 | #endif |
| 2547 | prog->argv = NULL; |
Stephen Warren | 60c38c9 | 2014-03-01 22:16:10 -0700 | [diff] [blame] | 2548 | prog->argv_nonnull = NULL; |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 2549 | #ifndef __U_BOOT__ |
| 2550 | prog->is_stopped = 0; |
| 2551 | #endif |
| 2552 | prog->group = NULL; |
| 2553 | #ifndef __U_BOOT__ |
| 2554 | prog->glob_result.gl_pathv = NULL; |
| 2555 | prog->family = pi; |
| 2556 | #endif |
| 2557 | prog->sp = 0; |
| 2558 | ctx->child = prog; |
| 2559 | prog->type = ctx->type; |
| 2560 | |
| 2561 | /* but ctx->pipe and ctx->list_head remain unchanged */ |
| 2562 | return 0; |
| 2563 | } |
| 2564 | |
| 2565 | static int done_pipe(struct p_context *ctx, pipe_style type) |
| 2566 | { |
| 2567 | struct pipe *new_p; |
| 2568 | done_command(ctx); /* implicit closure of previous command */ |
| 2569 | debug_printf("done_pipe, type %d\n", type); |
| 2570 | ctx->pipe->followup = type; |
| 2571 | ctx->pipe->r_mode = ctx->w; |
| 2572 | new_p=new_pipe(); |
| 2573 | ctx->pipe->next = new_p; |
| 2574 | ctx->pipe = new_p; |
| 2575 | ctx->child = NULL; |
| 2576 | done_command(ctx); /* set up new pipe to accept commands */ |
| 2577 | return 0; |
| 2578 | } |
| 2579 | |
| 2580 | #ifndef __U_BOOT__ |
| 2581 | /* peek ahead in the in_str to find out if we have a "&n" construct, |
| 2582 | * as in "2>&1", that represents duplicating a file descriptor. |
| 2583 | * returns either -2 (syntax error), -1 (no &), or the number found. |
| 2584 | */ |
| 2585 | static int redirect_dup_num(struct in_str *input) |
| 2586 | { |
| 2587 | int ch, d=0, ok=0; |
| 2588 | ch = b_peek(input); |
| 2589 | if (ch != '&') return -1; |
| 2590 | |
| 2591 | b_getch(input); /* get the & */ |
| 2592 | ch=b_peek(input); |
| 2593 | if (ch == '-') { |
| 2594 | b_getch(input); |
| 2595 | return -3; /* "-" represents "close me" */ |
| 2596 | } |
| 2597 | while (isdigit(ch)) { |
| 2598 | d = d*10+(ch-'0'); |
| 2599 | ok=1; |
| 2600 | b_getch(input); |
| 2601 | ch = b_peek(input); |
| 2602 | } |
| 2603 | if (ok) return d; |
| 2604 | |
| 2605 | error_msg("ambiguous redirect"); |
| 2606 | return -2; |
| 2607 | } |
| 2608 | |
| 2609 | /* If a redirect is immediately preceded by a number, that number is |
| 2610 | * supposed to tell which file descriptor to redirect. This routine |
| 2611 | * looks for such preceding numbers. In an ideal world this routine |
| 2612 | * needs to handle all the following classes of redirects... |
| 2613 | * echo 2>foo # redirects fd 2 to file "foo", nothing passed to echo |
| 2614 | * echo 49>foo # redirects fd 49 to file "foo", nothing passed to echo |
| 2615 | * echo -2>foo # redirects fd 1 to file "foo", "-2" passed to echo |
| 2616 | * echo 49x>foo # redirects fd 1 to file "foo", "49x" passed to echo |
| 2617 | * A -1 output from this program means no valid number was found, so the |
| 2618 | * caller should use the appropriate default for this redirection. |
| 2619 | */ |
| 2620 | static int redirect_opt_num(o_string *o) |
| 2621 | { |
| 2622 | int num; |
| 2623 | |
| 2624 | if (o->length==0) return -1; |
| 2625 | for(num=0; num<o->length; num++) { |
| 2626 | if (!isdigit(*(o->data+num))) { |
| 2627 | return -1; |
| 2628 | } |
| 2629 | } |
| 2630 | /* reuse num (and save an int) */ |
| 2631 | num=atoi(o->data); |
| 2632 | b_reset(o); |
| 2633 | return num; |
| 2634 | } |
| 2635 | |
| 2636 | FILE *generate_stream_from_list(struct pipe *head) |
| 2637 | { |
| 2638 | FILE *pf; |
| 2639 | #if 1 |
| 2640 | int pid, channel[2]; |
| 2641 | if (pipe(channel)<0) perror_msg_and_die("pipe"); |
| 2642 | pid=fork(); |
| 2643 | if (pid<0) { |
| 2644 | perror_msg_and_die("fork"); |
| 2645 | } else if (pid==0) { |
| 2646 | close(channel[0]); |
| 2647 | if (channel[1] != 1) { |
| 2648 | dup2(channel[1],1); |
| 2649 | close(channel[1]); |
| 2650 | } |
| 2651 | #if 0 |
| 2652 | #define SURROGATE "surrogate response" |
| 2653 | write(1,SURROGATE,sizeof(SURROGATE)); |
| 2654 | _exit(run_list(head)); |
| 2655 | #else |
| 2656 | _exit(run_list_real(head)); /* leaks memory */ |
| 2657 | #endif |
| 2658 | } |
| 2659 | debug_printf("forked child %d\n",pid); |
| 2660 | close(channel[1]); |
| 2661 | pf = fdopen(channel[0],"r"); |
| 2662 | debug_printf("pipe on FILE *%p\n",pf); |
| 2663 | #else |
| 2664 | free_pipe_list(head,0); |
| 2665 | pf=popen("echo surrogate response","r"); |
| 2666 | debug_printf("started fake pipe on FILE *%p\n",pf); |
| 2667 | #endif |
| 2668 | return pf; |
| 2669 | } |
| 2670 | |
| 2671 | /* this version hacked for testing purposes */ |
| 2672 | /* return code is exit status of the process that is run. */ |
| 2673 | static int process_command_subs(o_string *dest, struct p_context *ctx, struct in_str *input, int subst_end) |
| 2674 | { |
| 2675 | int retcode; |
| 2676 | o_string result=NULL_O_STRING; |
| 2677 | struct p_context inner; |
| 2678 | FILE *p; |
| 2679 | struct in_str pipe_str; |
| 2680 | initialize_context(&inner); |
| 2681 | |
| 2682 | /* recursion to generate command */ |
| 2683 | retcode = parse_stream(&result, &inner, input, subst_end); |
| 2684 | if (retcode != 0) return retcode; /* syntax error or EOF */ |
| 2685 | done_word(&result, &inner); |
| 2686 | done_pipe(&inner, PIPE_SEQ); |
| 2687 | b_free(&result); |
| 2688 | |
| 2689 | p=generate_stream_from_list(inner.list_head); |
| 2690 | if (p==NULL) return 1; |
| 2691 | mark_open(fileno(p)); |
| 2692 | setup_file_in_str(&pipe_str, p); |
| 2693 | |
| 2694 | /* now send results of command back into original context */ |
| 2695 | retcode = parse_stream(dest, ctx, &pipe_str, '\0'); |
| 2696 | /* XXX In case of a syntax error, should we try to kill the child? |
| 2697 | * That would be tough to do right, so just read until EOF. */ |
| 2698 | if (retcode == 1) { |
| 2699 | while (b_getch(&pipe_str)!=EOF) { /* discard */ }; |
| 2700 | } |
| 2701 | |
| 2702 | debug_printf("done reading from pipe, pclose()ing\n"); |
| 2703 | /* This is the step that wait()s for the child. Should be pretty |
| 2704 | * safe, since we just read an EOF from its stdout. We could try |
| 2705 | * to better, by using wait(), and keeping track of background jobs |
| 2706 | * at the same time. That would be a lot of work, and contrary |
| 2707 | * to the KISS philosophy of this program. */ |
| 2708 | mark_closed(fileno(p)); |
| 2709 | retcode=pclose(p); |
| 2710 | free_pipe_list(inner.list_head,0); |
| 2711 | debug_printf("pclosed, retcode=%d\n",retcode); |
| 2712 | /* XXX this process fails to trim a single trailing newline */ |
| 2713 | return retcode; |
| 2714 | } |
| 2715 | |
| 2716 | static int parse_group(o_string *dest, struct p_context *ctx, |
| 2717 | struct in_str *input, int ch) |
| 2718 | { |
| 2719 | int rcode, endch=0; |
| 2720 | struct p_context sub; |
| 2721 | struct child_prog *child = ctx->child; |
| 2722 | if (child->argv) { |
| 2723 | syntax(); |
| 2724 | return 1; /* syntax error, groups and arglists don't mix */ |
| 2725 | } |
| 2726 | initialize_context(&sub); |
| 2727 | switch(ch) { |
| 2728 | case '(': endch=')'; child->subshell=1; break; |
| 2729 | case '{': endch='}'; break; |
| 2730 | default: syntax(); /* really logic error */ |
| 2731 | } |
| 2732 | rcode=parse_stream(dest,&sub,input,endch); |
| 2733 | done_word(dest,&sub); /* finish off the final word in the subcontext */ |
| 2734 | done_pipe(&sub, PIPE_SEQ); /* and the final command there, too */ |
| 2735 | child->group = sub.list_head; |
| 2736 | return rcode; |
| 2737 | /* child remains "open", available for possible redirects */ |
| 2738 | } |
| 2739 | #endif |
| 2740 | |
| 2741 | /* basically useful version until someone wants to get fancier, |
| 2742 | * see the bash man page under "Parameter Expansion" */ |
| 2743 | static char *lookup_param(char *src) |
| 2744 | { |
wdenk | 6203e40 | 2004-04-18 10:13:26 +0000 | [diff] [blame] | 2745 | char *p; |
Joe Hershberger | 82fea77 | 2012-08-17 10:26:29 +0000 | [diff] [blame] | 2746 | char *sep; |
| 2747 | char *default_val = NULL; |
| 2748 | int assign = 0; |
| 2749 | int expand_empty = 0; |
wdenk | 6203e40 | 2004-04-18 10:13:26 +0000 | [diff] [blame] | 2750 | |
| 2751 | if (!src) |
| 2752 | return NULL; |
| 2753 | |
Joe Hershberger | 82fea77 | 2012-08-17 10:26:29 +0000 | [diff] [blame] | 2754 | sep = strchr(src, ':'); |
| 2755 | |
| 2756 | if (sep) { |
| 2757 | *sep = '\0'; |
| 2758 | if (*(sep + 1) == '-') |
| 2759 | default_val = sep+2; |
| 2760 | if (*(sep + 1) == '=') { |
| 2761 | default_val = sep+2; |
| 2762 | assign = 1; |
| 2763 | } |
| 2764 | if (*(sep + 1) == '+') { |
| 2765 | default_val = sep+2; |
| 2766 | expand_empty = 1; |
| 2767 | } |
| 2768 | } |
| 2769 | |
| 2770 | p = getenv(src); |
| 2771 | if (!p) |
| 2772 | p = get_local_var(src); |
| 2773 | |
| 2774 | if (!p || strlen(p) == 0) { |
| 2775 | p = default_val; |
| 2776 | if (assign) { |
| 2777 | char *var = malloc(strlen(src)+strlen(default_val)+2); |
| 2778 | if (var) { |
| 2779 | sprintf(var, "%s=%s", src, default_val); |
| 2780 | set_local_var(var, 0); |
| 2781 | } |
| 2782 | free(var); |
| 2783 | } |
| 2784 | } else if (expand_empty) { |
| 2785 | p += strlen(p); |
| 2786 | } |
| 2787 | |
| 2788 | if (sep) |
| 2789 | *sep = ':'; |
wdenk | 6203e40 | 2004-04-18 10:13:26 +0000 | [diff] [blame] | 2790 | |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 2791 | return p; |
| 2792 | } |
wdenk | 6203e40 | 2004-04-18 10:13:26 +0000 | [diff] [blame] | 2793 | |
| 2794 | #ifdef __U_BOOT__ |
| 2795 | static char *get_dollar_var(char ch) |
| 2796 | { |
| 2797 | static char buf[40]; |
| 2798 | |
| 2799 | buf[0] = '\0'; |
| 2800 | switch (ch) { |
| 2801 | case '?': |
| 2802 | sprintf(buf, "%u", (unsigned int)last_return_code); |
| 2803 | break; |
| 2804 | default: |
| 2805 | return NULL; |
| 2806 | } |
| 2807 | return buf; |
| 2808 | } |
| 2809 | #endif |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 2810 | |
| 2811 | /* return code: 0 for OK, 1 for syntax error */ |
| 2812 | static int handle_dollar(o_string *dest, struct p_context *ctx, struct in_str *input) |
| 2813 | { |
| 2814 | #ifndef __U_BOOT__ |
| 2815 | int i, advance=0; |
| 2816 | #else |
| 2817 | int advance=0; |
| 2818 | #endif |
| 2819 | #ifndef __U_BOOT__ |
| 2820 | char sep[]=" "; |
| 2821 | #endif |
| 2822 | int ch = input->peek(input); /* first character after the $ */ |
| 2823 | debug_printf("handle_dollar: ch=%c\n",ch); |
| 2824 | if (isalpha(ch)) { |
| 2825 | b_addchr(dest, SPECIAL_VAR_SYMBOL); |
| 2826 | ctx->child->sp++; |
| 2827 | while(ch=b_peek(input),isalnum(ch) || ch=='_') { |
| 2828 | b_getch(input); |
| 2829 | b_addchr(dest,ch); |
| 2830 | } |
| 2831 | b_addchr(dest, SPECIAL_VAR_SYMBOL); |
| 2832 | #ifndef __U_BOOT__ |
| 2833 | } else if (isdigit(ch)) { |
| 2834 | i = ch-'0'; /* XXX is $0 special? */ |
| 2835 | if (i<global_argc) { |
| 2836 | parse_string(dest, ctx, global_argv[i]); /* recursion */ |
| 2837 | } |
| 2838 | advance = 1; |
| 2839 | #endif |
| 2840 | } else switch (ch) { |
| 2841 | #ifndef __U_BOOT__ |
| 2842 | case '$': |
| 2843 | b_adduint(dest,getpid()); |
| 2844 | advance = 1; |
| 2845 | break; |
| 2846 | case '!': |
| 2847 | if (last_bg_pid > 0) b_adduint(dest, last_bg_pid); |
| 2848 | advance = 1; |
| 2849 | break; |
| 2850 | #endif |
| 2851 | case '?': |
wdenk | 6203e40 | 2004-04-18 10:13:26 +0000 | [diff] [blame] | 2852 | #ifndef __U_BOOT__ |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 2853 | b_adduint(dest,last_return_code); |
wdenk | 6203e40 | 2004-04-18 10:13:26 +0000 | [diff] [blame] | 2854 | #else |
| 2855 | ctx->child->sp++; |
| 2856 | b_addchr(dest, SPECIAL_VAR_SYMBOL); |
| 2857 | b_addchr(dest, '$'); |
| 2858 | b_addchr(dest, '?'); |
| 2859 | b_addchr(dest, SPECIAL_VAR_SYMBOL); |
| 2860 | #endif |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 2861 | advance = 1; |
| 2862 | break; |
| 2863 | #ifndef __U_BOOT__ |
| 2864 | case '#': |
| 2865 | b_adduint(dest,global_argc ? global_argc-1 : 0); |
| 2866 | advance = 1; |
| 2867 | break; |
| 2868 | #endif |
| 2869 | case '{': |
| 2870 | b_addchr(dest, SPECIAL_VAR_SYMBOL); |
| 2871 | ctx->child->sp++; |
| 2872 | b_getch(input); |
| 2873 | /* XXX maybe someone will try to escape the '}' */ |
| 2874 | while(ch=b_getch(input),ch!=EOF && ch!='}') { |
| 2875 | b_addchr(dest,ch); |
| 2876 | } |
| 2877 | if (ch != '}') { |
| 2878 | syntax(); |
| 2879 | return 1; |
| 2880 | } |
| 2881 | b_addchr(dest, SPECIAL_VAR_SYMBOL); |
| 2882 | break; |
| 2883 | #ifndef __U_BOOT__ |
| 2884 | case '(': |
| 2885 | b_getch(input); |
| 2886 | process_command_subs(dest, ctx, input, ')'); |
| 2887 | break; |
| 2888 | case '*': |
| 2889 | sep[0]=ifs[0]; |
| 2890 | for (i=1; i<global_argc; i++) { |
| 2891 | parse_string(dest, ctx, global_argv[i]); |
| 2892 | if (i+1 < global_argc) parse_string(dest, ctx, sep); |
| 2893 | } |
| 2894 | break; |
| 2895 | case '@': |
| 2896 | case '-': |
| 2897 | case '_': |
| 2898 | /* still unhandled, but should be eventually */ |
| 2899 | error_msg("unhandled syntax: $%c",ch); |
| 2900 | return 1; |
| 2901 | break; |
| 2902 | #endif |
| 2903 | default: |
| 2904 | b_addqchr(dest,'$',dest->quote); |
| 2905 | } |
| 2906 | /* Eat the character if the flag was set. If the compiler |
| 2907 | * is smart enough, we could substitute "b_getch(input);" |
| 2908 | * for all the "advance = 1;" above, and also end up with |
| 2909 | * a nice size-optimized program. Hah! That'll be the day. |
| 2910 | */ |
| 2911 | if (advance) b_getch(input); |
| 2912 | return 0; |
| 2913 | } |
| 2914 | |
| 2915 | #ifndef __U_BOOT__ |
| 2916 | int parse_string(o_string *dest, struct p_context *ctx, const char *src) |
| 2917 | { |
| 2918 | struct in_str foo; |
| 2919 | setup_string_in_str(&foo, src); |
| 2920 | return parse_stream(dest, ctx, &foo, '\0'); |
| 2921 | } |
| 2922 | #endif |
| 2923 | |
| 2924 | /* return code is 0 for normal exit, 1 for syntax error */ |
Kim Phillips | b052b60 | 2012-10-29 13:34:32 +0000 | [diff] [blame] | 2925 | static int parse_stream(o_string *dest, struct p_context *ctx, |
| 2926 | struct in_str *input, int end_trigger) |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 2927 | { |
| 2928 | unsigned int ch, m; |
| 2929 | #ifndef __U_BOOT__ |
| 2930 | int redir_fd; |
| 2931 | redir_type redir_style; |
| 2932 | #endif |
| 2933 | int next; |
| 2934 | |
| 2935 | /* Only double-quote state is handled in the state variable dest->quote. |
| 2936 | * A single-quote triggers a bypass of the main loop until its mate is |
| 2937 | * found. When recursing, quote state is passed in via dest->quote. */ |
| 2938 | |
| 2939 | debug_printf("parse_stream, end_trigger=%d\n",end_trigger); |
| 2940 | while ((ch=b_getch(input))!=EOF) { |
| 2941 | m = map[ch]; |
| 2942 | #ifdef __U_BOOT__ |
| 2943 | if (input->__promptme == 0) return 1; |
| 2944 | #endif |
| 2945 | next = (ch == '\n') ? 0 : b_peek(input); |
wdenk | 6203e40 | 2004-04-18 10:13:26 +0000 | [diff] [blame] | 2946 | |
| 2947 | debug_printf("parse_stream: ch=%c (%d) m=%d quote=%d - %c\n", |
| 2948 | ch >= ' ' ? ch : '.', ch, m, |
| 2949 | dest->quote, ctx->stack == NULL ? '*' : '.'); |
| 2950 | |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 2951 | if (m==0 || ((m==1 || m==2) && dest->quote)) { |
| 2952 | b_addqchr(dest, ch, dest->quote); |
| 2953 | } else { |
| 2954 | if (m==2) { /* unquoted IFS */ |
| 2955 | if (done_word(dest, ctx)) { |
| 2956 | return 1; |
| 2957 | } |
| 2958 | /* If we aren't performing a substitution, treat a newline as a |
| 2959 | * command separator. */ |
| 2960 | if (end_trigger != '\0' && ch=='\n') |
| 2961 | done_pipe(ctx,PIPE_SEQ); |
| 2962 | } |
| 2963 | if (ch == end_trigger && !dest->quote && ctx->w==RES_NONE) { |
| 2964 | debug_printf("leaving parse_stream (triggered)\n"); |
| 2965 | return 0; |
| 2966 | } |
| 2967 | #if 0 |
| 2968 | if (ch=='\n') { |
| 2969 | /* Yahoo! Time to run with it! */ |
| 2970 | done_pipe(ctx,PIPE_SEQ); |
| 2971 | run_list(ctx->list_head); |
| 2972 | initialize_context(ctx); |
| 2973 | } |
| 2974 | #endif |
| 2975 | if (m!=2) switch (ch) { |
| 2976 | case '#': |
| 2977 | if (dest->length == 0 && !dest->quote) { |
| 2978 | while(ch=b_peek(input),ch!=EOF && ch!='\n') { b_getch(input); } |
| 2979 | } else { |
| 2980 | b_addqchr(dest, ch, dest->quote); |
| 2981 | } |
| 2982 | break; |
| 2983 | case '\\': |
| 2984 | if (next == EOF) { |
| 2985 | syntax(); |
| 2986 | return 1; |
| 2987 | } |
| 2988 | b_addqchr(dest, '\\', dest->quote); |
| 2989 | b_addqchr(dest, b_getch(input), dest->quote); |
| 2990 | break; |
| 2991 | case '$': |
| 2992 | if (handle_dollar(dest, ctx, input)!=0) return 1; |
| 2993 | break; |
| 2994 | case '\'': |
| 2995 | dest->nonnull = 1; |
| 2996 | while(ch=b_getch(input),ch!=EOF && ch!='\'') { |
| 2997 | #ifdef __U_BOOT__ |
| 2998 | if(input->__promptme == 0) return 1; |
| 2999 | #endif |
| 3000 | b_addchr(dest,ch); |
| 3001 | } |
| 3002 | if (ch==EOF) { |
| 3003 | syntax(); |
| 3004 | return 1; |
| 3005 | } |
| 3006 | break; |
| 3007 | case '"': |
| 3008 | dest->nonnull = 1; |
| 3009 | dest->quote = !dest->quote; |
| 3010 | break; |
| 3011 | #ifndef __U_BOOT__ |
| 3012 | case '`': |
| 3013 | process_command_subs(dest, ctx, input, '`'); |
| 3014 | break; |
| 3015 | case '>': |
| 3016 | redir_fd = redirect_opt_num(dest); |
| 3017 | done_word(dest, ctx); |
| 3018 | redir_style=REDIRECT_OVERWRITE; |
| 3019 | if (next == '>') { |
| 3020 | redir_style=REDIRECT_APPEND; |
| 3021 | b_getch(input); |
| 3022 | } else if (next == '(') { |
| 3023 | syntax(); /* until we support >(list) Process Substitution */ |
| 3024 | return 1; |
| 3025 | } |
| 3026 | setup_redirect(ctx, redir_fd, redir_style, input); |
| 3027 | break; |
| 3028 | case '<': |
| 3029 | redir_fd = redirect_opt_num(dest); |
| 3030 | done_word(dest, ctx); |
| 3031 | redir_style=REDIRECT_INPUT; |
| 3032 | if (next == '<') { |
| 3033 | redir_style=REDIRECT_HEREIS; |
| 3034 | b_getch(input); |
| 3035 | } else if (next == '>') { |
| 3036 | redir_style=REDIRECT_IO; |
| 3037 | b_getch(input); |
| 3038 | } else if (next == '(') { |
| 3039 | syntax(); /* until we support <(list) Process Substitution */ |
| 3040 | return 1; |
| 3041 | } |
| 3042 | setup_redirect(ctx, redir_fd, redir_style, input); |
| 3043 | break; |
| 3044 | #endif |
| 3045 | case ';': |
| 3046 | done_word(dest, ctx); |
| 3047 | done_pipe(ctx,PIPE_SEQ); |
| 3048 | break; |
| 3049 | case '&': |
| 3050 | done_word(dest, ctx); |
| 3051 | if (next=='&') { |
| 3052 | b_getch(input); |
| 3053 | done_pipe(ctx,PIPE_AND); |
| 3054 | } else { |
| 3055 | #ifndef __U_BOOT__ |
| 3056 | done_pipe(ctx,PIPE_BG); |
| 3057 | #else |
| 3058 | syntax_err(); |
| 3059 | return 1; |
| 3060 | #endif |
| 3061 | } |
| 3062 | break; |
| 3063 | case '|': |
| 3064 | done_word(dest, ctx); |
| 3065 | if (next=='|') { |
| 3066 | b_getch(input); |
| 3067 | done_pipe(ctx,PIPE_OR); |
| 3068 | } else { |
| 3069 | /* we could pick up a file descriptor choice here |
| 3070 | * with redirect_opt_num(), but bash doesn't do it. |
| 3071 | * "echo foo 2| cat" yields "foo 2". */ |
| 3072 | #ifndef __U_BOOT__ |
| 3073 | done_command(ctx); |
| 3074 | #else |
| 3075 | syntax_err(); |
| 3076 | return 1; |
| 3077 | #endif |
| 3078 | } |
| 3079 | break; |
| 3080 | #ifndef __U_BOOT__ |
| 3081 | case '(': |
| 3082 | case '{': |
| 3083 | if (parse_group(dest, ctx, input, ch)!=0) return 1; |
| 3084 | break; |
| 3085 | case ')': |
| 3086 | case '}': |
| 3087 | syntax(); /* Proper use of this character caught by end_trigger */ |
| 3088 | return 1; |
| 3089 | break; |
| 3090 | #endif |
Joe Hershberger | 38de0b6 | 2012-08-17 10:26:30 +0000 | [diff] [blame] | 3091 | case SUBSTED_VAR_SYMBOL: |
| 3092 | dest->nonnull = 1; |
| 3093 | while (ch = b_getch(input), ch != EOF && |
| 3094 | ch != SUBSTED_VAR_SYMBOL) { |
| 3095 | debug_printf("subst, pass=%d\n", ch); |
| 3096 | if (input->__promptme == 0) |
| 3097 | return 1; |
| 3098 | b_addchr(dest, ch); |
| 3099 | } |
| 3100 | debug_printf("subst, term=%d\n", ch); |
| 3101 | if (ch == EOF) { |
| 3102 | syntax(); |
| 3103 | return 1; |
| 3104 | } |
| 3105 | break; |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 3106 | default: |
| 3107 | syntax(); /* this is really an internal logic error */ |
| 3108 | return 1; |
| 3109 | } |
| 3110 | } |
| 3111 | } |
| 3112 | /* complain if quote? No, maybe we just finished a command substitution |
| 3113 | * that was quoted. Example: |
| 3114 | * $ echo "`cat foo` plus more" |
| 3115 | * and we just got the EOF generated by the subshell that ran "cat foo" |
| 3116 | * The only real complaint is if we got an EOF when end_trigger != '\0', |
| 3117 | * that is, we were really supposed to get end_trigger, and never got |
| 3118 | * one before the EOF. Can't use the standard "syntax error" return code, |
| 3119 | * so that parse_stream_outer can distinguish the EOF and exit smoothly. */ |
| 3120 | debug_printf("leaving parse_stream (EOF)\n"); |
| 3121 | if (end_trigger != '\0') return -1; |
| 3122 | return 0; |
| 3123 | } |
| 3124 | |
Kim Phillips | b052b60 | 2012-10-29 13:34:32 +0000 | [diff] [blame] | 3125 | static void mapset(const unsigned char *set, int code) |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 3126 | { |
| 3127 | const unsigned char *s; |
| 3128 | for (s=set; *s; s++) map[*s] = code; |
| 3129 | } |
| 3130 | |
Kim Phillips | b052b60 | 2012-10-29 13:34:32 +0000 | [diff] [blame] | 3131 | static void update_ifs_map(void) |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 3132 | { |
| 3133 | /* char *ifs and char map[256] are both globals. */ |
Wolfgang Denk | 7fb5266 | 2005-10-13 16:45:02 +0200 | [diff] [blame] | 3134 | ifs = (uchar *)getenv("IFS"); |
| 3135 | if (ifs == NULL) ifs=(uchar *)" \t\n"; |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 3136 | /* Precompute a list of 'flow through' behavior so it can be treated |
| 3137 | * quickly up front. Computation is necessary because of IFS. |
| 3138 | * Special case handling of IFS == " \t\n" is not implemented. |
| 3139 | * The map[] array only really needs two bits each, and on most machines |
| 3140 | * that would be faster because of the reduced L1 cache footprint. |
| 3141 | */ |
| 3142 | memset(map,0,sizeof(map)); /* most characters flow through always */ |
| 3143 | #ifndef __U_BOOT__ |
Wolfgang Denk | 7fb5266 | 2005-10-13 16:45:02 +0200 | [diff] [blame] | 3144 | mapset((uchar *)"\\$'\"`", 3); /* never flow through */ |
| 3145 | mapset((uchar *)"<>;&|(){}#", 1); /* flow through if quoted */ |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 3146 | #else |
Joe Hershberger | 38de0b6 | 2012-08-17 10:26:30 +0000 | [diff] [blame] | 3147 | { |
| 3148 | uchar subst[2] = {SUBSTED_VAR_SYMBOL, 0}; |
| 3149 | mapset(subst, 3); /* never flow through */ |
| 3150 | } |
Wolfgang Denk | 7fb5266 | 2005-10-13 16:45:02 +0200 | [diff] [blame] | 3151 | mapset((uchar *)"\\$'\"", 3); /* never flow through */ |
| 3152 | mapset((uchar *)";&|#", 1); /* flow through if quoted */ |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 3153 | #endif |
| 3154 | mapset(ifs, 2); /* also flow through if quoted */ |
| 3155 | } |
| 3156 | |
| 3157 | /* most recursion does not come through here, the exeception is |
| 3158 | * from builtin_source() */ |
Kim Phillips | b052b60 | 2012-10-29 13:34:32 +0000 | [diff] [blame] | 3159 | static int parse_stream_outer(struct in_str *inp, int flag) |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 3160 | { |
| 3161 | |
| 3162 | struct p_context ctx; |
| 3163 | o_string temp=NULL_O_STRING; |
| 3164 | int rcode; |
| 3165 | #ifdef __U_BOOT__ |
Rabin Vincent | c3249b8 | 2014-10-29 23:21:41 +0100 | [diff] [blame] | 3166 | int code = 1; |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 3167 | #endif |
| 3168 | do { |
| 3169 | ctx.type = flag; |
| 3170 | initialize_context(&ctx); |
| 3171 | update_ifs_map(); |
Wolfgang Denk | 7fb5266 | 2005-10-13 16:45:02 +0200 | [diff] [blame] | 3172 | if (!(flag & FLAG_PARSE_SEMICOLON) || (flag & FLAG_REPARSING)) mapset((uchar *)";$&|", 0); |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 3173 | inp->promptmode=1; |
Simon Glass | 94cb9c2 | 2014-10-07 13:59:43 -0600 | [diff] [blame] | 3174 | rcode = parse_stream(&temp, &ctx, inp, |
| 3175 | flag & FLAG_CONT_ON_NEWLINE ? -1 : '\n'); |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 3176 | #ifdef __U_BOOT__ |
| 3177 | if (rcode == 1) flag_repeat = 0; |
| 3178 | #endif |
| 3179 | if (rcode != 1 && ctx.old_flag != 0) { |
| 3180 | syntax(); |
| 3181 | #ifdef __U_BOOT__ |
| 3182 | flag_repeat = 0; |
| 3183 | #endif |
| 3184 | } |
| 3185 | if (rcode != 1 && ctx.old_flag == 0) { |
| 3186 | done_word(&temp, &ctx); |
| 3187 | done_pipe(&ctx,PIPE_SEQ); |
| 3188 | #ifndef __U_BOOT__ |
| 3189 | run_list(ctx.list_head); |
| 3190 | #else |
wdenk | 6203e40 | 2004-04-18 10:13:26 +0000 | [diff] [blame] | 3191 | code = run_list(ctx.list_head); |
| 3192 | if (code == -2) { /* exit */ |
| 3193 | b_free(&temp); |
| 3194 | code = 0; |
| 3195 | /* XXX hackish way to not allow exit from main loop */ |
| 3196 | if (inp->peek == file_peek) { |
| 3197 | printf("exit not allowed from main input shell.\n"); |
| 3198 | continue; |
| 3199 | } |
| 3200 | break; |
| 3201 | } |
| 3202 | if (code == -1) |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 3203 | flag_repeat = 0; |
| 3204 | #endif |
| 3205 | } else { |
| 3206 | if (ctx.old_flag != 0) { |
| 3207 | free(ctx.stack); |
| 3208 | b_reset(&temp); |
| 3209 | } |
| 3210 | #ifdef __U_BOOT__ |
| 3211 | if (inp->__promptme == 0) printf("<INTERRUPT>\n"); |
| 3212 | inp->__promptme = 1; |
| 3213 | #endif |
| 3214 | temp.nonnull = 0; |
| 3215 | temp.quote = 0; |
| 3216 | inp->p = NULL; |
| 3217 | free_pipe_list(ctx.list_head,0); |
| 3218 | } |
| 3219 | b_free(&temp); |
Simon Glass | 2961710 | 2014-05-30 14:41:50 -0600 | [diff] [blame] | 3220 | /* loop on syntax errors, return on EOF */ |
Rabin Vincent | ae68a82 | 2014-11-21 23:05:22 +0100 | [diff] [blame] | 3221 | } while (rcode != -1 && !(flag & FLAG_EXIT_FROM_LOOP) && |
Simon Glass | 2961710 | 2014-05-30 14:41:50 -0600 | [diff] [blame] | 3222 | (inp->peek != static_peek || b_peek(inp))); |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 3223 | #ifndef __U_BOOT__ |
| 3224 | return 0; |
| 3225 | #else |
| 3226 | return (code != 0) ? 1 : 0; |
| 3227 | #endif /* __U_BOOT__ */ |
| 3228 | } |
| 3229 | |
| 3230 | #ifndef __U_BOOT__ |
| 3231 | static int parse_string_outer(const char *s, int flag) |
| 3232 | #else |
Jason Hobbs | a56febb | 2011-08-31 05:37:24 +0000 | [diff] [blame] | 3233 | int parse_string_outer(const char *s, int flag) |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 3234 | #endif /* __U_BOOT__ */ |
| 3235 | { |
| 3236 | struct in_str input; |
| 3237 | #ifdef __U_BOOT__ |
| 3238 | char *p = NULL; |
| 3239 | int rcode; |
Rabin Vincent | 401ac65 | 2014-10-29 23:21:39 +0100 | [diff] [blame] | 3240 | if (!s) |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 3241 | return 1; |
Rabin Vincent | 401ac65 | 2014-10-29 23:21:39 +0100 | [diff] [blame] | 3242 | if (!*s) |
| 3243 | return 0; |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 3244 | if (!(p = strchr(s, '\n')) || *++p) { |
| 3245 | p = xmalloc(strlen(s) + 2); |
| 3246 | strcpy(p, s); |
| 3247 | strcat(p, "\n"); |
| 3248 | setup_string_in_str(&input, p); |
| 3249 | rcode = parse_stream_outer(&input, flag); |
| 3250 | free(p); |
| 3251 | return rcode; |
| 3252 | } else { |
| 3253 | #endif |
| 3254 | setup_string_in_str(&input, s); |
| 3255 | return parse_stream_outer(&input, flag); |
| 3256 | #ifdef __U_BOOT__ |
| 3257 | } |
| 3258 | #endif |
| 3259 | } |
| 3260 | |
| 3261 | #ifndef __U_BOOT__ |
| 3262 | static int parse_file_outer(FILE *f) |
| 3263 | #else |
| 3264 | int parse_file_outer(void) |
| 3265 | #endif |
| 3266 | { |
| 3267 | int rcode; |
| 3268 | struct in_str input; |
| 3269 | #ifndef __U_BOOT__ |
| 3270 | setup_file_in_str(&input, f); |
| 3271 | #else |
| 3272 | setup_file_in_str(&input); |
| 3273 | #endif |
| 3274 | rcode = parse_stream_outer(&input, FLAG_PARSE_SEMICOLON); |
| 3275 | return rcode; |
| 3276 | } |
| 3277 | |
| 3278 | #ifdef __U_BOOT__ |
Wolfgang Denk | d0813e5 | 2010-10-28 20:00:11 +0200 | [diff] [blame] | 3279 | #ifdef CONFIG_NEEDS_MANUAL_RELOC |
wdenk | b02744a | 2003-04-05 00:53:31 +0000 | [diff] [blame] | 3280 | static void u_boot_hush_reloc(void) |
| 3281 | { |
wdenk | b02744a | 2003-04-05 00:53:31 +0000 | [diff] [blame] | 3282 | unsigned long addr; |
| 3283 | struct reserved_combo *r; |
| 3284 | |
| 3285 | for (r=reserved_list; r<reserved_list+NRES; r++) { |
| 3286 | addr = (ulong) (r->literal) + gd->reloc_off; |
| 3287 | r->literal = (char *)addr; |
| 3288 | } |
| 3289 | } |
Peter Tyser | 9057cbf | 2009-09-21 11:20:36 -0500 | [diff] [blame] | 3290 | #endif |
wdenk | b02744a | 2003-04-05 00:53:31 +0000 | [diff] [blame] | 3291 | |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 3292 | int u_boot_hush_start(void) |
| 3293 | { |
wdenk | bd1575f | 2003-10-14 19:43:55 +0000 | [diff] [blame] | 3294 | if (top_vars == NULL) { |
| 3295 | top_vars = malloc(sizeof(struct variables)); |
| 3296 | top_vars->name = "HUSH_VERSION"; |
| 3297 | top_vars->value = "0.01"; |
Kim Phillips | b052b60 | 2012-10-29 13:34:32 +0000 | [diff] [blame] | 3298 | top_vars->next = NULL; |
wdenk | bd1575f | 2003-10-14 19:43:55 +0000 | [diff] [blame] | 3299 | top_vars->flg_export = 0; |
| 3300 | top_vars->flg_read_only = 1; |
Wolfgang Denk | d0813e5 | 2010-10-28 20:00:11 +0200 | [diff] [blame] | 3301 | #ifdef CONFIG_NEEDS_MANUAL_RELOC |
wdenk | bd1575f | 2003-10-14 19:43:55 +0000 | [diff] [blame] | 3302 | u_boot_hush_reloc(); |
Peter Tyser | 9057cbf | 2009-09-21 11:20:36 -0500 | [diff] [blame] | 3303 | #endif |
wdenk | bd1575f | 2003-10-14 19:43:55 +0000 | [diff] [blame] | 3304 | } |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 3305 | return 0; |
| 3306 | } |
| 3307 | |
| 3308 | static void *xmalloc(size_t size) |
| 3309 | { |
| 3310 | void *p = NULL; |
| 3311 | |
| 3312 | if (!(p = malloc(size))) { |
| 3313 | printf("ERROR : memory not allocated\n"); |
| 3314 | for(;;); |
| 3315 | } |
| 3316 | return p; |
| 3317 | } |
| 3318 | |
| 3319 | static void *xrealloc(void *ptr, size_t size) |
| 3320 | { |
| 3321 | void *p = NULL; |
| 3322 | |
| 3323 | if (!(p = realloc(ptr, size))) { |
| 3324 | printf("ERROR : memory not allocated\n"); |
| 3325 | for(;;); |
| 3326 | } |
| 3327 | return p; |
| 3328 | } |
| 3329 | #endif /* __U_BOOT__ */ |
| 3330 | |
| 3331 | #ifndef __U_BOOT__ |
| 3332 | /* Make sure we have a controlling tty. If we get started under a job |
| 3333 | * aware app (like bash for example), make sure we are now in charge so |
| 3334 | * we don't fight over who gets the foreground */ |
wdenk | e7f34c6 | 2003-01-11 09:48:40 +0000 | [diff] [blame] | 3335 | static void setup_job_control(void) |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 3336 | { |
| 3337 | static pid_t shell_pgrp; |
| 3338 | /* Loop until we are in the foreground. */ |
| 3339 | while (tcgetpgrp (shell_terminal) != (shell_pgrp = getpgrp ())) |
| 3340 | kill (- shell_pgrp, SIGTTIN); |
| 3341 | |
| 3342 | /* Ignore interactive and job-control signals. */ |
| 3343 | signal(SIGINT, SIG_IGN); |
| 3344 | signal(SIGQUIT, SIG_IGN); |
| 3345 | signal(SIGTERM, SIG_IGN); |
| 3346 | signal(SIGTSTP, SIG_IGN); |
| 3347 | signal(SIGTTIN, SIG_IGN); |
| 3348 | signal(SIGTTOU, SIG_IGN); |
| 3349 | signal(SIGCHLD, SIG_IGN); |
| 3350 | |
| 3351 | /* Put ourselves in our own process group. */ |
| 3352 | setsid(); |
| 3353 | shell_pgrp = getpid (); |
| 3354 | setpgid (shell_pgrp, shell_pgrp); |
| 3355 | |
| 3356 | /* Grab control of the terminal. */ |
| 3357 | tcsetpgrp(shell_terminal, shell_pgrp); |
| 3358 | } |
| 3359 | |
Wolfgang Denk | 6262d021 | 2010-06-28 22:00:46 +0200 | [diff] [blame] | 3360 | int hush_main(int argc, char * const *argv) |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 3361 | { |
| 3362 | int opt; |
| 3363 | FILE *input; |
| 3364 | char **e = environ; |
| 3365 | |
| 3366 | /* XXX what should these be while sourcing /etc/profile? */ |
| 3367 | global_argc = argc; |
| 3368 | global_argv = argv; |
| 3369 | |
| 3370 | /* (re?) initialize globals. Sometimes hush_main() ends up calling |
| 3371 | * hush_main(), therefore we cannot rely on the BSS to zero out this |
| 3372 | * stuff. Reset these to 0 every time. */ |
| 3373 | ifs = NULL; |
| 3374 | /* map[] is taken care of with call to update_ifs_map() */ |
| 3375 | fake_mode = 0; |
| 3376 | interactive = 0; |
| 3377 | close_me_head = NULL; |
| 3378 | last_bg_pid = 0; |
| 3379 | job_list = NULL; |
| 3380 | last_jobid = 0; |
| 3381 | |
| 3382 | /* Initialize some more globals to non-zero values */ |
| 3383 | set_cwd(); |
wdenk | e7f34c6 | 2003-01-11 09:48:40 +0000 | [diff] [blame] | 3384 | #ifdef CONFIG_FEATURE_COMMAND_EDITING |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 3385 | cmdedit_set_initial_prompt(); |
| 3386 | #else |
| 3387 | PS1 = NULL; |
| 3388 | #endif |
| 3389 | PS2 = "> "; |
| 3390 | |
| 3391 | /* initialize our shell local variables with the values |
| 3392 | * currently living in the environment */ |
| 3393 | if (e) { |
| 3394 | for (; *e; e++) |
| 3395 | set_local_var(*e, 2); /* without call putenv() */ |
| 3396 | } |
| 3397 | |
| 3398 | last_return_code=EXIT_SUCCESS; |
| 3399 | |
| 3400 | |
| 3401 | if (argv[0] && argv[0][0] == '-') { |
| 3402 | debug_printf("\nsourcing /etc/profile\n"); |
| 3403 | if ((input = fopen("/etc/profile", "r")) != NULL) { |
| 3404 | mark_open(fileno(input)); |
| 3405 | parse_file_outer(input); |
| 3406 | mark_closed(fileno(input)); |
| 3407 | fclose(input); |
| 3408 | } |
| 3409 | } |
| 3410 | input=stdin; |
| 3411 | |
| 3412 | while ((opt = getopt(argc, argv, "c:xif")) > 0) { |
| 3413 | switch (opt) { |
| 3414 | case 'c': |
| 3415 | { |
| 3416 | global_argv = argv+optind; |
| 3417 | global_argc = argc-optind; |
| 3418 | opt = parse_string_outer(optarg, FLAG_PARSE_SEMICOLON); |
| 3419 | goto final_return; |
| 3420 | } |
| 3421 | break; |
| 3422 | case 'i': |
| 3423 | interactive++; |
| 3424 | break; |
| 3425 | case 'f': |
| 3426 | fake_mode++; |
| 3427 | break; |
| 3428 | default: |
| 3429 | #ifndef BB_VER |
| 3430 | fprintf(stderr, "Usage: sh [FILE]...\n" |
| 3431 | " or: sh -c command [args]...\n\n"); |
| 3432 | exit(EXIT_FAILURE); |
| 3433 | #else |
| 3434 | show_usage(); |
| 3435 | #endif |
| 3436 | } |
| 3437 | } |
| 3438 | /* A shell is interactive if the `-i' flag was given, or if all of |
| 3439 | * the following conditions are met: |
| 3440 | * no -c command |
| 3441 | * no arguments remaining or the -s flag given |
| 3442 | * standard input is a terminal |
| 3443 | * standard output is a terminal |
| 3444 | * Refer to Posix.2, the description of the `sh' utility. */ |
| 3445 | if (argv[optind]==NULL && input==stdin && |
| 3446 | isatty(fileno(stdin)) && isatty(fileno(stdout))) { |
| 3447 | interactive++; |
| 3448 | } |
| 3449 | |
| 3450 | debug_printf("\ninteractive=%d\n", interactive); |
| 3451 | if (interactive) { |
| 3452 | /* Looks like they want an interactive shell */ |
wdenk | 57b2d80 | 2003-06-27 21:31:46 +0000 | [diff] [blame] | 3453 | #ifndef CONFIG_FEATURE_SH_EXTRA_QUIET |
wdenk | e7f34c6 | 2003-01-11 09:48:40 +0000 | [diff] [blame] | 3454 | printf( "\n\n" BB_BANNER " hush - the humble shell v0.01 (testing)\n"); |
| 3455 | printf( "Enter 'help' for a list of built-in commands.\n\n"); |
| 3456 | #endif |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 3457 | setup_job_control(); |
| 3458 | } |
| 3459 | |
| 3460 | if (argv[optind]==NULL) { |
| 3461 | opt=parse_file_outer(stdin); |
| 3462 | goto final_return; |
| 3463 | } |
| 3464 | |
| 3465 | debug_printf("\nrunning script '%s'\n", argv[optind]); |
| 3466 | global_argv = argv+optind; |
| 3467 | global_argc = argc-optind; |
| 3468 | input = xfopen(argv[optind], "r"); |
| 3469 | opt = parse_file_outer(input); |
| 3470 | |
wdenk | e7f34c6 | 2003-01-11 09:48:40 +0000 | [diff] [blame] | 3471 | #ifdef CONFIG_FEATURE_CLEAN_UP |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 3472 | fclose(input); |
| 3473 | if (cwd && cwd != unknown) |
| 3474 | free((char*)cwd); |
| 3475 | { |
| 3476 | struct variables *cur, *tmp; |
| 3477 | for(cur = top_vars; cur; cur = tmp) { |
| 3478 | tmp = cur->next; |
| 3479 | if (!cur->flg_read_only) { |
| 3480 | free(cur->name); |
| 3481 | free(cur->value); |
| 3482 | free(cur); |
| 3483 | } |
| 3484 | } |
| 3485 | } |
| 3486 | #endif |
| 3487 | |
| 3488 | final_return: |
| 3489 | return(opt?opt:last_return_code); |
| 3490 | } |
| 3491 | #endif |
| 3492 | |
| 3493 | static char *insert_var_value(char *inp) |
| 3494 | { |
Joe Hershberger | 38de0b6 | 2012-08-17 10:26:30 +0000 | [diff] [blame] | 3495 | return insert_var_value_sub(inp, 0); |
| 3496 | } |
| 3497 | |
| 3498 | static char *insert_var_value_sub(char *inp, int tag_subst) |
| 3499 | { |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 3500 | int res_str_len = 0; |
| 3501 | int len; |
| 3502 | int done = 0; |
| 3503 | char *p, *p1, *res_str = NULL; |
| 3504 | |
| 3505 | while ((p = strchr(inp, SPECIAL_VAR_SYMBOL))) { |
Joe Hershberger | 38de0b6 | 2012-08-17 10:26:30 +0000 | [diff] [blame] | 3506 | /* check the beginning of the string for normal charachters */ |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 3507 | if (p != inp) { |
Joe Hershberger | 38de0b6 | 2012-08-17 10:26:30 +0000 | [diff] [blame] | 3508 | /* copy any charachters to the result string */ |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 3509 | len = p - inp; |
| 3510 | res_str = xrealloc(res_str, (res_str_len + len)); |
| 3511 | strncpy((res_str + res_str_len), inp, len); |
| 3512 | res_str_len += len; |
| 3513 | } |
| 3514 | inp = ++p; |
Joe Hershberger | 38de0b6 | 2012-08-17 10:26:30 +0000 | [diff] [blame] | 3515 | /* find the ending marker */ |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 3516 | p = strchr(inp, SPECIAL_VAR_SYMBOL); |
| 3517 | *p = '\0'; |
Joe Hershberger | 38de0b6 | 2012-08-17 10:26:30 +0000 | [diff] [blame] | 3518 | /* look up the value to substitute */ |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 3519 | if ((p1 = lookup_param(inp))) { |
Joe Hershberger | 38de0b6 | 2012-08-17 10:26:30 +0000 | [diff] [blame] | 3520 | if (tag_subst) |
| 3521 | len = res_str_len + strlen(p1) + 2; |
| 3522 | else |
| 3523 | len = res_str_len + strlen(p1); |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 3524 | res_str = xrealloc(res_str, (1 + len)); |
Joe Hershberger | 38de0b6 | 2012-08-17 10:26:30 +0000 | [diff] [blame] | 3525 | if (tag_subst) { |
| 3526 | /* |
| 3527 | * copy the variable value to the result |
| 3528 | * string |
| 3529 | */ |
| 3530 | strcpy((res_str + res_str_len + 1), p1); |
| 3531 | |
| 3532 | /* |
| 3533 | * mark the replaced text to be accepted as |
| 3534 | * is |
| 3535 | */ |
| 3536 | res_str[res_str_len] = SUBSTED_VAR_SYMBOL; |
| 3537 | res_str[res_str_len + 1 + strlen(p1)] = |
| 3538 | SUBSTED_VAR_SYMBOL; |
| 3539 | } else |
| 3540 | /* |
| 3541 | * copy the variable value to the result |
| 3542 | * string |
| 3543 | */ |
| 3544 | strcpy((res_str + res_str_len), p1); |
| 3545 | |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 3546 | res_str_len = len; |
| 3547 | } |
| 3548 | *p = SPECIAL_VAR_SYMBOL; |
| 3549 | inp = ++p; |
| 3550 | done = 1; |
| 3551 | } |
| 3552 | if (done) { |
| 3553 | res_str = xrealloc(res_str, (1 + res_str_len + strlen(inp))); |
| 3554 | strcpy((res_str + res_str_len), inp); |
| 3555 | while ((p = strchr(res_str, '\n'))) { |
| 3556 | *p = ' '; |
| 3557 | } |
| 3558 | } |
| 3559 | return (res_str == NULL) ? inp : res_str; |
| 3560 | } |
| 3561 | |
| 3562 | static char **make_list_in(char **inp, char *name) |
| 3563 | { |
| 3564 | int len, i; |
| 3565 | int name_len = strlen(name); |
| 3566 | int n = 0; |
| 3567 | char **list; |
| 3568 | char *p1, *p2, *p3; |
| 3569 | |
| 3570 | /* create list of variable values */ |
| 3571 | list = xmalloc(sizeof(*list)); |
| 3572 | for (i = 0; inp[i]; i++) { |
| 3573 | p3 = insert_var_value(inp[i]); |
| 3574 | p1 = p3; |
| 3575 | while (*p1) { |
Jeroen Hofstee | 95ab0d3 | 2014-06-11 00:28:47 +0200 | [diff] [blame] | 3576 | if (*p1 == ' ') { |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 3577 | p1++; |
| 3578 | continue; |
| 3579 | } |
| 3580 | if ((p2 = strchr(p1, ' '))) { |
| 3581 | len = p2 - p1; |
| 3582 | } else { |
| 3583 | len = strlen(p1); |
| 3584 | p2 = p1 + len; |
| 3585 | } |
| 3586 | /* we use n + 2 in realloc for list,because we add |
| 3587 | * new element and then we will add NULL element */ |
| 3588 | list = xrealloc(list, sizeof(*list) * (n + 2)); |
| 3589 | list[n] = xmalloc(2 + name_len + len); |
| 3590 | strcpy(list[n], name); |
| 3591 | strcat(list[n], "="); |
| 3592 | strncat(list[n], p1, len); |
| 3593 | list[n++][name_len + len + 1] = '\0'; |
| 3594 | p1 = p2; |
| 3595 | } |
| 3596 | if (p3 != inp[i]) free(p3); |
| 3597 | } |
| 3598 | list[n] = NULL; |
| 3599 | return list; |
| 3600 | } |
| 3601 | |
Stephen Warren | 60c38c9 | 2014-03-01 22:16:10 -0700 | [diff] [blame] | 3602 | /* |
| 3603 | * Make new string for parser |
| 3604 | * inp - array of argument strings to flatten |
| 3605 | * nonnull - indicates argument was quoted when originally parsed |
| 3606 | */ |
| 3607 | static char *make_string(char **inp, int *nonnull) |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 3608 | { |
| 3609 | char *p; |
| 3610 | char *str = NULL; |
| 3611 | int n; |
| 3612 | int len = 2; |
Joe Hershberger | 38de0b6 | 2012-08-17 10:26:30 +0000 | [diff] [blame] | 3613 | char *noeval_str; |
| 3614 | int noeval = 0; |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 3615 | |
Joe Hershberger | 38de0b6 | 2012-08-17 10:26:30 +0000 | [diff] [blame] | 3616 | noeval_str = get_local_var("HUSH_NO_EVAL"); |
| 3617 | if (noeval_str != NULL && *noeval_str != '0' && *noeval_str != '\0') |
| 3618 | noeval = 1; |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 3619 | for (n = 0; inp[n]; n++) { |
Joe Hershberger | 38de0b6 | 2012-08-17 10:26:30 +0000 | [diff] [blame] | 3620 | p = insert_var_value_sub(inp[n], noeval); |
Stephen Warren | 60c38c9 | 2014-03-01 22:16:10 -0700 | [diff] [blame] | 3621 | str = xrealloc(str, (len + strlen(p) + (2 * nonnull[n]))); |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 3622 | if (n) { |
| 3623 | strcat(str, " "); |
| 3624 | } else { |
| 3625 | *str = '\0'; |
| 3626 | } |
Stephen Warren | 60c38c9 | 2014-03-01 22:16:10 -0700 | [diff] [blame] | 3627 | if (nonnull[n]) |
| 3628 | strcat(str, "'"); |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 3629 | strcat(str, p); |
Stephen Warren | 60c38c9 | 2014-03-01 22:16:10 -0700 | [diff] [blame] | 3630 | if (nonnull[n]) |
| 3631 | strcat(str, "'"); |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 3632 | len = strlen(str) + 3; |
| 3633 | if (p != inp[n]) free(p); |
| 3634 | } |
| 3635 | len = strlen(str); |
| 3636 | *(str + len) = '\n'; |
| 3637 | *(str + len + 1) = '\0'; |
| 3638 | return str; |
| 3639 | } |
| 3640 | |
Heiko Schocher | 49ebcb5 | 2008-10-15 09:40:28 +0200 | [diff] [blame] | 3641 | #ifdef __U_BOOT__ |
Kim Phillips | b052b60 | 2012-10-29 13:34:32 +0000 | [diff] [blame] | 3642 | static int do_showvar(cmd_tbl_t *cmdtp, int flag, int argc, |
| 3643 | char * const argv[]) |
Heiko Schocher | 49ebcb5 | 2008-10-15 09:40:28 +0200 | [diff] [blame] | 3644 | { |
| 3645 | int i, k; |
| 3646 | int rcode = 0; |
| 3647 | struct variables *cur; |
| 3648 | |
| 3649 | if (argc == 1) { /* Print all env variables */ |
| 3650 | for (cur = top_vars; cur; cur = cur->next) { |
| 3651 | printf ("%s=%s\n", cur->name, cur->value); |
| 3652 | if (ctrlc ()) { |
| 3653 | puts ("\n ** Abort\n"); |
| 3654 | return 1; |
| 3655 | } |
| 3656 | } |
| 3657 | return 0; |
| 3658 | } |
| 3659 | for (i = 1; i < argc; ++i) { /* print single env variables */ |
| 3660 | char *name = argv[i]; |
| 3661 | |
| 3662 | k = -1; |
| 3663 | for (cur = top_vars; cur; cur = cur->next) { |
| 3664 | if(strcmp (cur->name, name) == 0) { |
| 3665 | k = 0; |
| 3666 | printf ("%s=%s\n", cur->name, cur->value); |
| 3667 | } |
| 3668 | if (ctrlc ()) { |
| 3669 | puts ("\n ** Abort\n"); |
| 3670 | return 1; |
| 3671 | } |
| 3672 | } |
| 3673 | if (k < 0) { |
| 3674 | printf ("## Error: \"%s\" not defined\n", name); |
| 3675 | rcode ++; |
| 3676 | } |
| 3677 | } |
| 3678 | return rcode; |
| 3679 | } |
| 3680 | |
| 3681 | U_BOOT_CMD( |
Jean-Christophe PLAGNIOL-VILLARD | 0383694 | 2008-10-16 15:01:15 +0200 | [diff] [blame] | 3682 | showvar, CONFIG_SYS_MAXARGS, 1, do_showvar, |
Peter Tyser | dfb72b8 | 2009-01-27 18:03:12 -0600 | [diff] [blame] | 3683 | "print local hushshell variables", |
Heiko Schocher | 49ebcb5 | 2008-10-15 09:40:28 +0200 | [diff] [blame] | 3684 | "\n - print values of all hushshell variables\n" |
| 3685 | "showvar name ...\n" |
Wolfgang Denk | c54781c | 2009-05-24 17:06:54 +0200 | [diff] [blame] | 3686 | " - print value of hushshell variable 'name'" |
Heiko Schocher | 49ebcb5 | 2008-10-15 09:40:28 +0200 | [diff] [blame] | 3687 | ); |
| 3688 | |
| 3689 | #endif |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 3690 | /****************************************************************************/ |