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fe8c2806 WD |
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: | |
fe8c2806 WD |
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 | * | |
1a459660 | 74 | * SPDX-License-Identifier: GPL-2.0+ |
fe8c2806 | 75 | */ |
1a459660 | 76 | |
fe8c2806 WD |
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 */ | |
0098e179 | 82 | #include <bootretry.h> |
18d66533 | 83 | #include <cli.h> |
eca86fad | 84 | #include <cli_hush.h> |
fe8c2806 | 85 | #include <command.h> /* find_cmd */ |
219f4788 TR |
86 | #ifndef CONFIG_SYS_PROMPT_HUSH_PS2 |
87 | #define CONFIG_SYS_PROMPT_HUSH_PS2 "> " | |
88 | #endif | |
fe8c2806 | 89 | #endif |
fe8c2806 WD |
90 | #ifndef __U_BOOT__ |
91 | #include <ctype.h> /* isalpha, isdigit */ | |
92 | #include <unistd.h> /* getpid */ | |
93 | #include <stdlib.h> /* getenv, atoi */ | |
94 | #include <string.h> /* strchr */ | |
95 | #include <stdio.h> /* popen etc. */ | |
96 | #include <glob.h> /* glob, of course */ | |
97 | #include <stdarg.h> /* va_list */ | |
98 | #include <errno.h> | |
99 | #include <fcntl.h> | |
100 | #include <getopt.h> /* should be pretty obvious */ | |
101 | ||
102 | #include <sys/stat.h> /* ulimit */ | |
103 | #include <sys/types.h> | |
104 | #include <sys/wait.h> | |
105 | #include <signal.h> | |
106 | ||
107 | /* #include <dmalloc.h> */ | |
fe8c2806 | 108 | |
d0fb80c3 | 109 | #if 1 |
fe8c2806 WD |
110 | #include "busybox.h" |
111 | #include "cmdedit.h" | |
112 | #else | |
113 | #define applet_name "hush" | |
114 | #include "standalone.h" | |
115 | #define hush_main main | |
d0fb80c3 WD |
116 | #undef CONFIG_FEATURE_SH_FANCY_PROMPT |
117 | #define BB_BANNER | |
fe8c2806 WD |
118 | #endif |
119 | #endif | |
120 | #define SPECIAL_VAR_SYMBOL 03 | |
a005f19e | 121 | #define SUBSTED_VAR_SYMBOL 04 |
fe8c2806 WD |
122 | #ifndef __U_BOOT__ |
123 | #define FLAG_EXIT_FROM_LOOP 1 | |
124 | #define FLAG_PARSE_SEMICOLON (1 << 1) /* symbol ';' is special for parser */ | |
125 | #define FLAG_REPARSING (1 << 2) /* >= 2nd pass */ | |
126 | ||
127 | #endif | |
128 | ||
129 | #ifdef __U_BOOT__ | |
d87080b7 WD |
130 | DECLARE_GLOBAL_DATA_PTR; |
131 | ||
fe8c2806 WD |
132 | #define EXIT_SUCCESS 0 |
133 | #define EOF -1 | |
134 | #define syntax() syntax_err() | |
135 | #define xstrdup strdup | |
136 | #define error_msg printf | |
137 | #else | |
138 | typedef enum { | |
139 | REDIRECT_INPUT = 1, | |
140 | REDIRECT_OVERWRITE = 2, | |
141 | REDIRECT_APPEND = 3, | |
142 | REDIRECT_HEREIS = 4, | |
143 | REDIRECT_IO = 5 | |
144 | } redir_type; | |
145 | ||
146 | /* The descrip member of this structure is only used to make debugging | |
147 | * output pretty */ | |
148 | struct {int mode; int default_fd; char *descrip;} redir_table[] = { | |
149 | { 0, 0, "()" }, | |
150 | { O_RDONLY, 0, "<" }, | |
151 | { O_CREAT|O_TRUNC|O_WRONLY, 1, ">" }, | |
152 | { O_CREAT|O_APPEND|O_WRONLY, 1, ">>" }, | |
153 | { O_RDONLY, -1, "<<" }, | |
154 | { O_RDWR, 1, "<>" } | |
155 | }; | |
156 | #endif | |
157 | ||
158 | typedef enum { | |
159 | PIPE_SEQ = 1, | |
160 | PIPE_AND = 2, | |
161 | PIPE_OR = 3, | |
162 | PIPE_BG = 4, | |
163 | } pipe_style; | |
164 | ||
165 | /* might eventually control execution */ | |
166 | typedef enum { | |
167 | RES_NONE = 0, | |
168 | RES_IF = 1, | |
169 | RES_THEN = 2, | |
170 | RES_ELIF = 3, | |
171 | RES_ELSE = 4, | |
172 | RES_FI = 5, | |
173 | RES_FOR = 6, | |
174 | RES_WHILE = 7, | |
175 | RES_UNTIL = 8, | |
176 | RES_DO = 9, | |
177 | RES_DONE = 10, | |
178 | RES_XXXX = 11, | |
179 | RES_IN = 12, | |
180 | RES_SNTX = 13 | |
181 | } reserved_style; | |
182 | #define FLAG_END (1<<RES_NONE) | |
183 | #define FLAG_IF (1<<RES_IF) | |
184 | #define FLAG_THEN (1<<RES_THEN) | |
185 | #define FLAG_ELIF (1<<RES_ELIF) | |
186 | #define FLAG_ELSE (1<<RES_ELSE) | |
187 | #define FLAG_FI (1<<RES_FI) | |
188 | #define FLAG_FOR (1<<RES_FOR) | |
189 | #define FLAG_WHILE (1<<RES_WHILE) | |
190 | #define FLAG_UNTIL (1<<RES_UNTIL) | |
191 | #define FLAG_DO (1<<RES_DO) | |
192 | #define FLAG_DONE (1<<RES_DONE) | |
193 | #define FLAG_IN (1<<RES_IN) | |
194 | #define FLAG_START (1<<RES_XXXX) | |
195 | ||
196 | /* This holds pointers to the various results of parsing */ | |
197 | struct p_context { | |
198 | struct child_prog *child; | |
199 | struct pipe *list_head; | |
200 | struct pipe *pipe; | |
201 | #ifndef __U_BOOT__ | |
202 | struct redir_struct *pending_redirect; | |
203 | #endif | |
204 | reserved_style w; | |
205 | int old_flag; /* for figuring out valid reserved words */ | |
206 | struct p_context *stack; | |
207 | int type; /* define type of parser : ";$" common or special symbol */ | |
208 | /* How about quoting status? */ | |
209 | }; | |
210 | ||
211 | #ifndef __U_BOOT__ | |
212 | struct redir_struct { | |
213 | redir_type type; /* type of redirection */ | |
214 | int fd; /* file descriptor being redirected */ | |
215 | int dup; /* -1, or file descriptor being duplicated */ | |
216 | struct redir_struct *next; /* pointer to the next redirect in the list */ | |
217 | glob_t word; /* *word.gl_pathv is the filename */ | |
218 | }; | |
219 | #endif | |
220 | ||
221 | struct child_prog { | |
222 | #ifndef __U_BOOT__ | |
223 | pid_t pid; /* 0 if exited */ | |
224 | #endif | |
225 | char **argv; /* program name and arguments */ | |
fe9ca3d3 | 226 | /* was quoted when parsed; copy of struct o_string.nonnull field */ |
eca86fad | 227 | int *argv_nonnull; |
fe8c2806 WD |
228 | #ifdef __U_BOOT__ |
229 | int argc; /* number of program arguments */ | |
230 | #endif | |
231 | struct pipe *group; /* if non-NULL, first in group or subshell */ | |
232 | #ifndef __U_BOOT__ | |
233 | int subshell; /* flag, non-zero if group must be forked */ | |
234 | struct redir_struct *redirects; /* I/O redirections */ | |
235 | glob_t glob_result; /* result of parameter globbing */ | |
236 | int is_stopped; /* is the program currently running? */ | |
237 | struct pipe *family; /* pointer back to the child's parent pipe */ | |
238 | #endif | |
239 | int sp; /* number of SPECIAL_VAR_SYMBOL */ | |
240 | int type; | |
241 | }; | |
242 | ||
243 | struct pipe { | |
244 | #ifndef __U_BOOT__ | |
245 | int jobid; /* job number */ | |
246 | #endif | |
247 | int num_progs; /* total number of programs in job */ | |
248 | #ifndef __U_BOOT__ | |
249 | int running_progs; /* number of programs running */ | |
250 | char *text; /* name of job */ | |
251 | char *cmdbuf; /* buffer various argv's point into */ | |
252 | pid_t pgrp; /* process group ID for the job */ | |
253 | #endif | |
254 | struct child_prog *progs; /* array of commands in pipe */ | |
255 | struct pipe *next; /* to track background commands */ | |
256 | #ifndef __U_BOOT__ | |
257 | int stopped_progs; /* number of programs alive, but stopped */ | |
258 | int job_context; /* bitmask defining current context */ | |
259 | #endif | |
260 | pipe_style followup; /* PIPE_BG, PIPE_SEQ, PIPE_OR, PIPE_AND */ | |
261 | reserved_style r_mode; /* supports if, for, while, until */ | |
262 | }; | |
263 | ||
264 | #ifndef __U_BOOT__ | |
265 | struct close_me { | |
266 | int fd; | |
267 | struct close_me *next; | |
268 | }; | |
269 | #endif | |
270 | ||
271 | struct variables { | |
272 | char *name; | |
273 | char *value; | |
274 | int flg_export; | |
275 | int flg_read_only; | |
276 | struct variables *next; | |
277 | }; | |
278 | ||
279 | /* globals, connect us to the outside world | |
280 | * the first three support $?, $#, and $1 */ | |
281 | #ifndef __U_BOOT__ | |
282 | char **global_argv; | |
283 | unsigned int global_argc; | |
284 | #endif | |
199adb60 | 285 | static unsigned int last_return_code; |
fe8c2806 WD |
286 | #ifndef __U_BOOT__ |
287 | extern char **environ; /* This is in <unistd.h>, but protected with __USE_GNU */ | |
288 | #endif | |
289 | ||
290 | /* "globals" within this file */ | |
77ddac94 | 291 | static uchar *ifs; |
fe8c2806 WD |
292 | static char map[256]; |
293 | #ifndef __U_BOOT__ | |
294 | static int fake_mode; | |
295 | static int interactive; | |
296 | static struct close_me *close_me_head; | |
297 | static const char *cwd; | |
298 | static struct pipe *job_list; | |
299 | static unsigned int last_bg_pid; | |
300 | static unsigned int last_jobid; | |
301 | static unsigned int shell_terminal; | |
302 | static char *PS1; | |
303 | static char *PS2; | |
304 | struct variables shell_ver = { "HUSH_VERSION", "0.01", 1, 1, 0 }; | |
305 | struct variables *top_vars = &shell_ver; | |
306 | #else | |
307 | static int flag_repeat = 0; | |
308 | static int do_repeat = 0; | |
2d5b561e | 309 | static struct variables *top_vars = NULL ; |
fe8c2806 WD |
310 | #endif /*__U_BOOT__ */ |
311 | ||
312 | #define B_CHUNK (100) | |
313 | #define B_NOSPAC 1 | |
314 | ||
315 | typedef struct { | |
316 | char *data; | |
317 | int length; | |
318 | int maxlen; | |
319 | int quote; | |
320 | int nonnull; | |
321 | } o_string; | |
322 | #define NULL_O_STRING {NULL,0,0,0,0} | |
323 | /* used for initialization: | |
324 | o_string foo = NULL_O_STRING; */ | |
325 | ||
326 | /* I can almost use ordinary FILE *. Is open_memstream() universally | |
327 | * available? Where is it documented? */ | |
328 | struct in_str { | |
329 | const char *p; | |
330 | #ifndef __U_BOOT__ | |
331 | char peek_buf[2]; | |
332 | #endif | |
333 | int __promptme; | |
334 | int promptmode; | |
335 | #ifndef __U_BOOT__ | |
336 | FILE *file; | |
337 | #endif | |
338 | int (*get) (struct in_str *); | |
339 | int (*peek) (struct in_str *); | |
340 | }; | |
341 | #define b_getch(input) ((input)->get(input)) | |
342 | #define b_peek(input) ((input)->peek(input)) | |
343 | ||
344 | #ifndef __U_BOOT__ | |
345 | #define JOB_STATUS_FORMAT "[%d] %-22s %.40s\n" | |
346 | ||
347 | struct built_in_command { | |
348 | char *cmd; /* name */ | |
349 | char *descr; /* description */ | |
350 | int (*function) (struct child_prog *); /* function ptr */ | |
351 | }; | |
352 | #endif | |
353 | ||
4cacf7c6 SR |
354 | /* define DEBUG_SHELL for debugging output (obviously ;-)) */ |
355 | #if 0 | |
356 | #define DEBUG_SHELL | |
357 | #endif | |
358 | ||
fe8c2806 WD |
359 | /* This should be in utility.c */ |
360 | #ifdef DEBUG_SHELL | |
361 | #ifndef __U_BOOT__ | |
362 | static void debug_printf(const char *format, ...) | |
363 | { | |
364 | va_list args; | |
365 | va_start(args, format); | |
366 | vfprintf(stderr, format, args); | |
367 | va_end(args); | |
368 | } | |
369 | #else | |
4cacf7c6 | 370 | #define debug_printf(fmt,args...) printf (fmt ,##args) |
fe8c2806 WD |
371 | #endif |
372 | #else | |
373 | static inline void debug_printf(const char *format, ...) { } | |
374 | #endif | |
375 | #define final_printf debug_printf | |
376 | ||
377 | #ifdef __U_BOOT__ | |
378 | static void syntax_err(void) { | |
379 | printf("syntax error\n"); | |
380 | } | |
381 | #else | |
382 | static void __syntax(char *file, int line) { | |
383 | error_msg("syntax error %s:%d", file, line); | |
384 | } | |
385 | #define syntax() __syntax(__FILE__, __LINE__) | |
386 | #endif | |
387 | ||
388 | #ifdef __U_BOOT__ | |
389 | static void *xmalloc(size_t size); | |
390 | static void *xrealloc(void *ptr, size_t size); | |
391 | #else | |
392 | /* Index of subroutines: */ | |
393 | /* function prototypes for builtins */ | |
394 | static int builtin_cd(struct child_prog *child); | |
395 | static int builtin_env(struct child_prog *child); | |
396 | static int builtin_eval(struct child_prog *child); | |
397 | static int builtin_exec(struct child_prog *child); | |
398 | static int builtin_exit(struct child_prog *child); | |
399 | static int builtin_export(struct child_prog *child); | |
400 | static int builtin_fg_bg(struct child_prog *child); | |
401 | static int builtin_help(struct child_prog *child); | |
402 | static int builtin_jobs(struct child_prog *child); | |
403 | static int builtin_pwd(struct child_prog *child); | |
404 | static int builtin_read(struct child_prog *child); | |
405 | static int builtin_set(struct child_prog *child); | |
406 | static int builtin_shift(struct child_prog *child); | |
407 | static int builtin_source(struct child_prog *child); | |
408 | static int builtin_umask(struct child_prog *child); | |
409 | static int builtin_unset(struct child_prog *child); | |
410 | static int builtin_not_written(struct child_prog *child); | |
411 | #endif | |
412 | /* o_string manipulation: */ | |
413 | static int b_check_space(o_string *o, int len); | |
414 | static int b_addchr(o_string *o, int ch); | |
415 | static void b_reset(o_string *o); | |
416 | static int b_addqchr(o_string *o, int ch, int quote); | |
c26e454d | 417 | #ifndef __U_BOOT__ |
fe8c2806 | 418 | static int b_adduint(o_string *o, unsigned int i); |
c26e454d | 419 | #endif |
fe8c2806 WD |
420 | /* in_str manipulations: */ |
421 | static int static_get(struct in_str *i); | |
422 | static int static_peek(struct in_str *i); | |
423 | static int file_get(struct in_str *i); | |
424 | static int file_peek(struct in_str *i); | |
425 | #ifndef __U_BOOT__ | |
426 | static void setup_file_in_str(struct in_str *i, FILE *f); | |
427 | #else | |
428 | static void setup_file_in_str(struct in_str *i); | |
429 | #endif | |
430 | static void setup_string_in_str(struct in_str *i, const char *s); | |
431 | #ifndef __U_BOOT__ | |
432 | /* close_me manipulations: */ | |
433 | static void mark_open(int fd); | |
434 | static void mark_closed(int fd); | |
d0fb80c3 | 435 | static void close_all(void); |
fe8c2806 WD |
436 | #endif |
437 | /* "run" the final data structures: */ | |
438 | static char *indenter(int i); | |
439 | static int free_pipe_list(struct pipe *head, int indent); | |
440 | static int free_pipe(struct pipe *pi, int indent); | |
441 | /* really run the final data structures: */ | |
442 | #ifndef __U_BOOT__ | |
443 | static int setup_redirects(struct child_prog *prog, int squirrel[]); | |
444 | #endif | |
445 | static int run_list_real(struct pipe *pi); | |
446 | #ifndef __U_BOOT__ | |
447 | static void pseudo_exec(struct child_prog *child) __attribute__ ((noreturn)); | |
448 | #endif | |
449 | static int run_pipe_real(struct pipe *pi); | |
450 | /* extended glob support: */ | |
451 | #ifndef __U_BOOT__ | |
452 | static int globhack(const char *src, int flags, glob_t *pglob); | |
453 | static int glob_needed(const char *s); | |
454 | static int xglob(o_string *dest, int flags, glob_t *pglob); | |
455 | #endif | |
456 | /* variable assignment: */ | |
457 | static int is_assignment(const char *s); | |
458 | /* data structure manipulation: */ | |
459 | #ifndef __U_BOOT__ | |
460 | static int setup_redirect(struct p_context *ctx, int fd, redir_type style, struct in_str *input); | |
461 | #endif | |
462 | static void initialize_context(struct p_context *ctx); | |
463 | static int done_word(o_string *dest, struct p_context *ctx); | |
464 | static int done_command(struct p_context *ctx); | |
465 | static int done_pipe(struct p_context *ctx, pipe_style type); | |
466 | /* primary string parsing: */ | |
467 | #ifndef __U_BOOT__ | |
468 | static int redirect_dup_num(struct in_str *input); | |
469 | static int redirect_opt_num(o_string *o); | |
470 | static int process_command_subs(o_string *dest, struct p_context *ctx, struct in_str *input, int subst_end); | |
471 | static int parse_group(o_string *dest, struct p_context *ctx, struct in_str *input, int ch); | |
472 | #endif | |
473 | static char *lookup_param(char *src); | |
fe9ca3d3 | 474 | static char *make_string(char **inp, int *nonnull); |
fe8c2806 WD |
475 | static int handle_dollar(o_string *dest, struct p_context *ctx, struct in_str *input); |
476 | #ifndef __U_BOOT__ | |
477 | static int parse_string(o_string *dest, struct p_context *ctx, const char *src); | |
478 | #endif | |
479 | static int parse_stream(o_string *dest, struct p_context *ctx, struct in_str *input0, int end_trigger); | |
480 | /* setup: */ | |
481 | static int parse_stream_outer(struct in_str *inp, int flag); | |
482 | #ifndef __U_BOOT__ | |
483 | static int parse_string_outer(const char *s, int flag); | |
484 | static int parse_file_outer(FILE *f); | |
485 | #endif | |
486 | #ifndef __U_BOOT__ | |
487 | /* job management: */ | |
488 | static int checkjobs(struct pipe* fg_pipe); | |
489 | static void insert_bg_job(struct pipe *pi); | |
490 | static void remove_bg_job(struct pipe *pi); | |
491 | #endif | |
492 | /* local variable support */ | |
493 | static char **make_list_in(char **inp, char *name); | |
494 | static char *insert_var_value(char *inp); | |
a005f19e | 495 | static char *insert_var_value_sub(char *inp, int tag_subst); |
fe8c2806 WD |
496 | |
497 | #ifndef __U_BOOT__ | |
498 | /* Table of built-in functions. They can be forked or not, depending on | |
499 | * context: within pipes, they fork. As simple commands, they do not. | |
500 | * When used in non-forking context, they can change global variables | |
501 | * in the parent shell process. If forked, of course they can not. | |
502 | * For example, 'unset foo | whatever' will parse and run, but foo will | |
503 | * still be set at the end. */ | |
504 | static struct built_in_command bltins[] = { | |
505 | {"bg", "Resume a job in the background", builtin_fg_bg}, | |
506 | {"break", "Exit for, while or until loop", builtin_not_written}, | |
507 | {"cd", "Change working directory", builtin_cd}, | |
508 | {"continue", "Continue for, while or until loop", builtin_not_written}, | |
509 | {"env", "Print all environment variables", builtin_env}, | |
510 | {"eval", "Construct and run shell command", builtin_eval}, | |
511 | {"exec", "Exec command, replacing this shell with the exec'd process", | |
512 | builtin_exec}, | |
513 | {"exit", "Exit from shell()", builtin_exit}, | |
514 | {"export", "Set environment variable", builtin_export}, | |
515 | {"fg", "Bring job into the foreground", builtin_fg_bg}, | |
516 | {"jobs", "Lists the active jobs", builtin_jobs}, | |
517 | {"pwd", "Print current directory", builtin_pwd}, | |
518 | {"read", "Input environment variable", builtin_read}, | |
519 | {"return", "Return from a function", builtin_not_written}, | |
520 | {"set", "Set/unset shell local variables", builtin_set}, | |
521 | {"shift", "Shift positional parameters", builtin_shift}, | |
522 | {"trap", "Trap signals", builtin_not_written}, | |
523 | {"ulimit","Controls resource limits", builtin_not_written}, | |
524 | {"umask","Sets file creation mask", builtin_umask}, | |
525 | {"unset", "Unset environment variable", builtin_unset}, | |
526 | {".", "Source-in and run commands in a file", builtin_source}, | |
527 | {"help", "List shell built-in commands", builtin_help}, | |
528 | {NULL, NULL, NULL} | |
529 | }; | |
530 | ||
531 | static const char *set_cwd(void) | |
532 | { | |
533 | if(cwd==unknown) | |
534 | cwd = NULL; /* xgetcwd(arg) called free(arg) */ | |
535 | cwd = xgetcwd((char *)cwd); | |
536 | if (!cwd) | |
537 | cwd = unknown; | |
538 | return cwd; | |
539 | } | |
540 | ||
541 | /* built-in 'eval' handler */ | |
542 | static int builtin_eval(struct child_prog *child) | |
543 | { | |
544 | char *str = NULL; | |
545 | int rcode = EXIT_SUCCESS; | |
546 | ||
547 | if (child->argv[1]) { | |
548 | str = make_string(child->argv + 1); | |
549 | parse_string_outer(str, FLAG_EXIT_FROM_LOOP | | |
550 | FLAG_PARSE_SEMICOLON); | |
551 | free(str); | |
552 | rcode = last_return_code; | |
553 | } | |
554 | return rcode; | |
555 | } | |
556 | ||
557 | /* built-in 'cd <path>' handler */ | |
558 | static int builtin_cd(struct child_prog *child) | |
559 | { | |
560 | char *newdir; | |
561 | if (child->argv[1] == NULL) | |
562 | newdir = getenv("HOME"); | |
563 | else | |
564 | newdir = child->argv[1]; | |
565 | if (chdir(newdir)) { | |
566 | printf("cd: %s: %s\n", newdir, strerror(errno)); | |
567 | return EXIT_FAILURE; | |
568 | } | |
569 | set_cwd(); | |
570 | return EXIT_SUCCESS; | |
571 | } | |
572 | ||
573 | /* built-in 'env' handler */ | |
574 | static int builtin_env(struct child_prog *dummy) | |
575 | { | |
576 | char **e = environ; | |
577 | if (e == NULL) return EXIT_FAILURE; | |
578 | for (; *e; e++) { | |
579 | puts(*e); | |
580 | } | |
581 | return EXIT_SUCCESS; | |
582 | } | |
583 | ||
584 | /* built-in 'exec' handler */ | |
585 | static int builtin_exec(struct child_prog *child) | |
586 | { | |
587 | if (child->argv[1] == NULL) | |
588 | return EXIT_SUCCESS; /* Really? */ | |
589 | child->argv++; | |
590 | pseudo_exec(child); | |
591 | /* never returns */ | |
592 | } | |
593 | ||
594 | /* built-in 'exit' handler */ | |
595 | static int builtin_exit(struct child_prog *child) | |
596 | { | |
597 | if (child->argv[1] == NULL) | |
598 | exit(last_return_code); | |
599 | exit (atoi(child->argv[1])); | |
600 | } | |
601 | ||
602 | /* built-in 'export VAR=value' handler */ | |
603 | static int builtin_export(struct child_prog *child) | |
604 | { | |
605 | int res = 0; | |
606 | char *name = child->argv[1]; | |
607 | ||
608 | if (name == NULL) { | |
609 | return (builtin_env(child)); | |
610 | } | |
611 | ||
612 | name = strdup(name); | |
613 | ||
614 | if(name) { | |
615 | char *value = strchr(name, '='); | |
616 | ||
617 | if (!value) { | |
618 | char *tmp; | |
619 | /* They are exporting something without an =VALUE */ | |
620 | ||
621 | value = get_local_var(name); | |
622 | if (value) { | |
623 | size_t ln = strlen(name); | |
624 | ||
625 | tmp = realloc(name, ln+strlen(value)+2); | |
626 | if(tmp==NULL) | |
627 | res = -1; | |
628 | else { | |
629 | sprintf(tmp+ln, "=%s", value); | |
630 | name = tmp; | |
631 | } | |
632 | } else { | |
633 | /* bash does not return an error when trying to export | |
634 | * an undefined variable. Do likewise. */ | |
635 | res = 1; | |
636 | } | |
637 | } | |
638 | } | |
639 | if (res<0) | |
640 | perror_msg("export"); | |
641 | else if(res==0) | |
642 | res = set_local_var(name, 1); | |
643 | else | |
644 | res = 0; | |
645 | free(name); | |
646 | return res; | |
647 | } | |
648 | ||
649 | /* built-in 'fg' and 'bg' handler */ | |
650 | static int builtin_fg_bg(struct child_prog *child) | |
651 | { | |
652 | int i, jobnum; | |
653 | struct pipe *pi=NULL; | |
654 | ||
655 | if (!interactive) | |
656 | return EXIT_FAILURE; | |
657 | /* If they gave us no args, assume they want the last backgrounded task */ | |
658 | if (!child->argv[1]) { | |
659 | for (pi = job_list; pi; pi = pi->next) { | |
660 | if (pi->jobid == last_jobid) { | |
661 | break; | |
662 | } | |
663 | } | |
664 | if (!pi) { | |
665 | error_msg("%s: no current job", child->argv[0]); | |
666 | return EXIT_FAILURE; | |
667 | } | |
668 | } else { | |
669 | if (sscanf(child->argv[1], "%%%d", &jobnum) != 1) { | |
670 | error_msg("%s: bad argument '%s'", child->argv[0], child->argv[1]); | |
671 | return EXIT_FAILURE; | |
672 | } | |
673 | for (pi = job_list; pi; pi = pi->next) { | |
674 | if (pi->jobid == jobnum) { | |
675 | break; | |
676 | } | |
677 | } | |
678 | if (!pi) { | |
679 | error_msg("%s: %d: no such job", child->argv[0], jobnum); | |
680 | return EXIT_FAILURE; | |
681 | } | |
682 | } | |
683 | ||
684 | if (*child->argv[0] == 'f') { | |
685 | /* Put the job into the foreground. */ | |
686 | tcsetpgrp(shell_terminal, pi->pgrp); | |
687 | } | |
688 | ||
689 | /* Restart the processes in the job */ | |
690 | for (i = 0; i < pi->num_progs; i++) | |
691 | pi->progs[i].is_stopped = 0; | |
692 | ||
693 | if ( (i=kill(- pi->pgrp, SIGCONT)) < 0) { | |
694 | if (i == ESRCH) { | |
695 | remove_bg_job(pi); | |
696 | } else { | |
697 | perror_msg("kill (SIGCONT)"); | |
698 | } | |
699 | } | |
700 | ||
701 | pi->stopped_progs = 0; | |
702 | return EXIT_SUCCESS; | |
703 | } | |
704 | ||
705 | /* built-in 'help' handler */ | |
706 | static int builtin_help(struct child_prog *dummy) | |
707 | { | |
708 | struct built_in_command *x; | |
709 | ||
710 | printf("\nBuilt-in commands:\n"); | |
711 | printf("-------------------\n"); | |
712 | for (x = bltins; x->cmd; x++) { | |
713 | if (x->descr==NULL) | |
714 | continue; | |
715 | printf("%s\t%s\n", x->cmd, x->descr); | |
716 | } | |
717 | printf("\n\n"); | |
718 | return EXIT_SUCCESS; | |
719 | } | |
720 | ||
721 | /* built-in 'jobs' handler */ | |
722 | static int builtin_jobs(struct child_prog *child) | |
723 | { | |
724 | struct pipe *job; | |
725 | char *status_string; | |
726 | ||
727 | for (job = job_list; job; job = job->next) { | |
728 | if (job->running_progs == job->stopped_progs) | |
729 | status_string = "Stopped"; | |
730 | else | |
731 | status_string = "Running"; | |
732 | ||
733 | printf(JOB_STATUS_FORMAT, job->jobid, status_string, job->text); | |
734 | } | |
735 | return EXIT_SUCCESS; | |
736 | } | |
737 | ||
738 | ||
739 | /* built-in 'pwd' handler */ | |
740 | static int builtin_pwd(struct child_prog *dummy) | |
741 | { | |
742 | puts(set_cwd()); | |
743 | return EXIT_SUCCESS; | |
744 | } | |
745 | ||
746 | /* built-in 'read VAR' handler */ | |
747 | static int builtin_read(struct child_prog *child) | |
748 | { | |
749 | int res; | |
750 | ||
751 | if (child->argv[1]) { | |
752 | char string[BUFSIZ]; | |
753 | char *var = 0; | |
754 | ||
755 | string[0] = 0; /* In case stdin has only EOF */ | |
756 | /* read string */ | |
757 | fgets(string, sizeof(string), stdin); | |
758 | chomp(string); | |
759 | var = malloc(strlen(child->argv[1])+strlen(string)+2); | |
760 | if(var) { | |
761 | sprintf(var, "%s=%s", child->argv[1], string); | |
762 | res = set_local_var(var, 0); | |
763 | } else | |
764 | res = -1; | |
765 | if (res) | |
766 | fprintf(stderr, "read: %m\n"); | |
767 | free(var); /* So not move up to avoid breaking errno */ | |
768 | return res; | |
769 | } else { | |
770 | do res=getchar(); while(res!='\n' && res!=EOF); | |
771 | return 0; | |
772 | } | |
773 | } | |
774 | ||
775 | /* built-in 'set VAR=value' handler */ | |
776 | static int builtin_set(struct child_prog *child) | |
777 | { | |
778 | char *temp = child->argv[1]; | |
779 | struct variables *e; | |
780 | ||
781 | if (temp == NULL) | |
782 | for(e = top_vars; e; e=e->next) | |
783 | printf("%s=%s\n", e->name, e->value); | |
784 | else | |
785 | set_local_var(temp, 0); | |
786 | ||
787 | return EXIT_SUCCESS; | |
788 | } | |
789 | ||
790 | ||
791 | /* Built-in 'shift' handler */ | |
792 | static int builtin_shift(struct child_prog *child) | |
793 | { | |
794 | int n=1; | |
795 | if (child->argv[1]) { | |
796 | n=atoi(child->argv[1]); | |
797 | } | |
798 | if (n>=0 && n<global_argc) { | |
799 | /* XXX This probably breaks $0 */ | |
800 | global_argc -= n; | |
801 | global_argv += n; | |
802 | return EXIT_SUCCESS; | |
803 | } else { | |
804 | return EXIT_FAILURE; | |
805 | } | |
806 | } | |
807 | ||
808 | /* Built-in '.' handler (read-in and execute commands from file) */ | |
809 | static int builtin_source(struct child_prog *child) | |
810 | { | |
811 | FILE *input; | |
812 | int status; | |
813 | ||
814 | if (child->argv[1] == NULL) | |
815 | return EXIT_FAILURE; | |
816 | ||
817 | /* XXX search through $PATH is missing */ | |
818 | input = fopen(child->argv[1], "r"); | |
819 | if (!input) { | |
820 | error_msg("Couldn't open file '%s'", child->argv[1]); | |
821 | return EXIT_FAILURE; | |
822 | } | |
823 | ||
824 | /* Now run the file */ | |
825 | /* XXX argv and argc are broken; need to save old global_argv | |
826 | * (pointer only is OK!) on this stack frame, | |
827 | * set global_argv=child->argv+1, recurse, and restore. */ | |
828 | mark_open(fileno(input)); | |
829 | status = parse_file_outer(input); | |
830 | mark_closed(fileno(input)); | |
831 | fclose(input); | |
832 | return (status); | |
833 | } | |
834 | ||
835 | static int builtin_umask(struct child_prog *child) | |
836 | { | |
837 | mode_t new_umask; | |
838 | const char *arg = child->argv[1]; | |
839 | char *end; | |
840 | if (arg) { | |
841 | new_umask=strtoul(arg, &end, 8); | |
842 | if (*end!='\0' || end == arg) { | |
843 | return EXIT_FAILURE; | |
844 | } | |
845 | } else { | |
846 | printf("%.3o\n", (unsigned int) (new_umask=umask(0))); | |
847 | } | |
848 | umask(new_umask); | |
849 | return EXIT_SUCCESS; | |
850 | } | |
851 | ||
852 | /* built-in 'unset VAR' handler */ | |
853 | static int builtin_unset(struct child_prog *child) | |
854 | { | |
855 | /* bash returned already true */ | |
856 | unset_local_var(child->argv[1]); | |
857 | return EXIT_SUCCESS; | |
858 | } | |
859 | ||
860 | static int builtin_not_written(struct child_prog *child) | |
861 | { | |
862 | printf("builtin_%s not written\n",child->argv[0]); | |
863 | return EXIT_FAILURE; | |
864 | } | |
865 | #endif | |
866 | ||
867 | static int b_check_space(o_string *o, int len) | |
868 | { | |
869 | /* It would be easy to drop a more restrictive policy | |
870 | * in here, such as setting a maximum string length */ | |
871 | if (o->length + len > o->maxlen) { | |
872 | char *old_data = o->data; | |
873 | /* assert (data == NULL || o->maxlen != 0); */ | |
874 | o->maxlen += max(2*len, B_CHUNK); | |
875 | o->data = realloc(o->data, 1 + o->maxlen); | |
876 | if (o->data == NULL) { | |
877 | free(old_data); | |
878 | } | |
879 | } | |
880 | return o->data == NULL; | |
881 | } | |
882 | ||
883 | static int b_addchr(o_string *o, int ch) | |
884 | { | |
885 | debug_printf("b_addchr: %c %d %p\n", ch, o->length, o); | |
886 | if (b_check_space(o, 1)) return B_NOSPAC; | |
887 | o->data[o->length] = ch; | |
888 | o->length++; | |
889 | o->data[o->length] = '\0'; | |
890 | return 0; | |
891 | } | |
892 | ||
893 | static void b_reset(o_string *o) | |
894 | { | |
895 | o->length = 0; | |
896 | o->nonnull = 0; | |
897 | if (o->data != NULL) *o->data = '\0'; | |
898 | } | |
899 | ||
900 | static void b_free(o_string *o) | |
901 | { | |
902 | b_reset(o); | |
d0fb80c3 | 903 | free(o->data); |
fe8c2806 WD |
904 | o->data = NULL; |
905 | o->maxlen = 0; | |
906 | } | |
907 | ||
908 | /* My analysis of quoting semantics tells me that state information | |
909 | * is associated with a destination, not a source. | |
910 | */ | |
911 | static int b_addqchr(o_string *o, int ch, int quote) | |
912 | { | |
913 | if (quote && strchr("*?[\\",ch)) { | |
914 | int rc; | |
915 | rc = b_addchr(o, '\\'); | |
916 | if (rc) return rc; | |
917 | } | |
918 | return b_addchr(o, ch); | |
919 | } | |
920 | ||
c26e454d | 921 | #ifndef __U_BOOT__ |
fe8c2806 WD |
922 | static int b_adduint(o_string *o, unsigned int i) |
923 | { | |
924 | int r; | |
925 | char *p = simple_itoa(i); | |
926 | /* no escape checking necessary */ | |
927 | do r=b_addchr(o, *p++); while (r==0 && *p); | |
928 | return r; | |
929 | } | |
c26e454d | 930 | #endif |
fe8c2806 WD |
931 | |
932 | static int static_get(struct in_str *i) | |
933 | { | |
d0ff51ba | 934 | int ch = *i->p++; |
fe8c2806 WD |
935 | if (ch=='\0') return EOF; |
936 | return ch; | |
937 | } | |
938 | ||
939 | static int static_peek(struct in_str *i) | |
940 | { | |
941 | return *i->p; | |
942 | } | |
943 | ||
944 | #ifndef __U_BOOT__ | |
945 | static inline void cmdedit_set_initial_prompt(void) | |
946 | { | |
d0fb80c3 | 947 | #ifndef CONFIG_FEATURE_SH_FANCY_PROMPT |
fe8c2806 WD |
948 | PS1 = NULL; |
949 | #else | |
950 | PS1 = getenv("PS1"); | |
951 | if(PS1==0) | |
952 | PS1 = "\\w \\$ "; | |
953 | #endif | |
954 | } | |
955 | ||
956 | static inline void setup_prompt_string(int promptmode, char **prompt_str) | |
957 | { | |
958 | debug_printf("setup_prompt_string %d ",promptmode); | |
d0fb80c3 | 959 | #ifndef CONFIG_FEATURE_SH_FANCY_PROMPT |
fe8c2806 WD |
960 | /* Set up the prompt */ |
961 | if (promptmode == 1) { | |
d0fb80c3 | 962 | free(PS1); |
fe8c2806 WD |
963 | PS1=xmalloc(strlen(cwd)+4); |
964 | sprintf(PS1, "%s %s", cwd, ( geteuid() != 0 ) ? "$ ":"# "); | |
965 | *prompt_str = PS1; | |
966 | } else { | |
967 | *prompt_str = PS2; | |
968 | } | |
969 | #else | |
970 | *prompt_str = (promptmode==1)? PS1 : PS2; | |
971 | #endif | |
972 | debug_printf("result %s\n",*prompt_str); | |
973 | } | |
974 | #endif | |
975 | ||
976 | static void get_user_input(struct in_str *i) | |
977 | { | |
978 | #ifndef __U_BOOT__ | |
979 | char *prompt_str; | |
980 | static char the_command[BUFSIZ]; | |
981 | ||
982 | setup_prompt_string(i->promptmode, &prompt_str); | |
d0fb80c3 | 983 | #ifdef CONFIG_FEATURE_COMMAND_EDITING |
fe8c2806 WD |
984 | /* |
985 | ** enable command line editing only while a command line | |
986 | ** is actually being read; otherwise, we'll end up bequeathing | |
987 | ** atexit() handlers and other unwanted stuff to our | |
988 | ** child processes (rob@sysgo.de) | |
989 | */ | |
990 | cmdedit_read_input(prompt_str, the_command); | |
991 | #else | |
992 | fputs(prompt_str, stdout); | |
993 | fflush(stdout); | |
994 | the_command[0]=fgetc(i->file); | |
995 | the_command[1]='\0'; | |
996 | #endif | |
997 | fflush(stdout); | |
998 | i->p = the_command; | |
999 | #else | |
fe8c2806 | 1000 | int n; |
5c50a92b | 1001 | static char the_command[CONFIG_SYS_CBSIZE + 1]; |
fe8c2806 | 1002 | |
b26440f1 | 1003 | bootretry_reset_cmd_timeout(); |
fe8c2806 WD |
1004 | i->__promptme = 1; |
1005 | if (i->promptmode == 1) { | |
e1bf824d | 1006 | n = cli_readline(CONFIG_SYS_PROMPT); |
fe8c2806 | 1007 | } else { |
e1bf824d | 1008 | n = cli_readline(CONFIG_SYS_PROMPT_HUSH_PS2); |
fe8c2806 | 1009 | } |
396387ab WD |
1010 | #ifdef CONFIG_BOOT_RETRY_TIME |
1011 | if (n == -2) { | |
1012 | puts("\nTimeout waiting for command\n"); | |
1013 | # ifdef CONFIG_RESET_TO_RETRY | |
1014 | do_reset(NULL, 0, 0, NULL); | |
1015 | # else | |
1016 | # error "This currently only works with CONFIG_RESET_TO_RETRY enabled" | |
1017 | # endif | |
1018 | } | |
1019 | #endif | |
fe8c2806 WD |
1020 | if (n == -1 ) { |
1021 | flag_repeat = 0; | |
1022 | i->__promptme = 0; | |
1023 | } | |
1024 | n = strlen(console_buffer); | |
1025 | console_buffer[n] = '\n'; | |
1026 | console_buffer[n+1]= '\0'; | |
1027 | if (had_ctrlc()) flag_repeat = 0; | |
1028 | clear_ctrlc(); | |
1029 | do_repeat = 0; | |
1030 | if (i->promptmode == 1) { | |
1031 | if (console_buffer[0] == '\n'&& flag_repeat == 0) { | |
1032 | strcpy(the_command,console_buffer); | |
1033 | } | |
1034 | else { | |
1035 | if (console_buffer[0] != '\n') { | |
1036 | strcpy(the_command,console_buffer); | |
1037 | flag_repeat = 1; | |
1038 | } | |
1039 | else { | |
1040 | do_repeat = 1; | |
1041 | } | |
1042 | } | |
1043 | i->p = the_command; | |
1044 | } | |
1045 | else { | |
8bde7f77 WD |
1046 | if (console_buffer[0] != '\n') { |
1047 | if (strlen(the_command) + strlen(console_buffer) | |
6d0f6bcf | 1048 | < CONFIG_SYS_CBSIZE) { |
8bde7f77 WD |
1049 | n = strlen(the_command); |
1050 | the_command[n-1] = ' '; | |
1051 | strcpy(&the_command[n],console_buffer); | |
fe8c2806 WD |
1052 | } |
1053 | else { | |
1054 | the_command[0] = '\n'; | |
1055 | the_command[1] = '\0'; | |
1056 | flag_repeat = 0; | |
1057 | } | |
1058 | } | |
1059 | if (i->__promptme == 0) { | |
1060 | the_command[0] = '\n'; | |
1061 | the_command[1] = '\0'; | |
1062 | } | |
1063 | i->p = console_buffer; | |
1064 | } | |
1065 | #endif | |
1066 | } | |
1067 | ||
1068 | /* This is the magic location that prints prompts | |
1069 | * and gets data back from the user */ | |
1070 | static int file_get(struct in_str *i) | |
1071 | { | |
1072 | int ch; | |
1073 | ||
1074 | ch = 0; | |
1075 | /* If there is data waiting, eat it up */ | |
1076 | if (i->p && *i->p) { | |
d0ff51ba | 1077 | ch = *i->p++; |
fe8c2806 WD |
1078 | } else { |
1079 | /* need to double check i->file because we might be doing something | |
1080 | * more complicated by now, like sourcing or substituting. */ | |
1081 | #ifndef __U_BOOT__ | |
1082 | if (i->__promptme && interactive && i->file == stdin) { | |
1083 | while(! i->p || (interactive && strlen(i->p)==0) ) { | |
1084 | #else | |
1085 | while(! i->p || strlen(i->p)==0 ) { | |
1086 | #endif | |
1087 | get_user_input(i); | |
1088 | } | |
1089 | i->promptmode=2; | |
1090 | #ifndef __U_BOOT__ | |
1091 | i->__promptme = 0; | |
1092 | #endif | |
1093 | if (i->p && *i->p) { | |
d0ff51ba | 1094 | ch = *i->p++; |
fe8c2806 WD |
1095 | } |
1096 | #ifndef __U_BOOT__ | |
1097 | } else { | |
1098 | ch = fgetc(i->file); | |
1099 | } | |
1100 | ||
1101 | #endif | |
1102 | debug_printf("b_getch: got a %d\n", ch); | |
1103 | } | |
1104 | #ifndef __U_BOOT__ | |
1105 | if (ch == '\n') i->__promptme=1; | |
1106 | #endif | |
1107 | return ch; | |
1108 | } | |
1109 | ||
1110 | /* All the callers guarantee this routine will never be | |
1111 | * used right after a newline, so prompting is not needed. | |
1112 | */ | |
1113 | static int file_peek(struct in_str *i) | |
1114 | { | |
1115 | #ifndef __U_BOOT__ | |
1116 | if (i->p && *i->p) { | |
1117 | #endif | |
1118 | return *i->p; | |
1119 | #ifndef __U_BOOT__ | |
1120 | } else { | |
1121 | i->peek_buf[0] = fgetc(i->file); | |
1122 | i->peek_buf[1] = '\0'; | |
1123 | i->p = i->peek_buf; | |
1124 | debug_printf("b_peek: got a %d\n", *i->p); | |
1125 | return *i->p; | |
1126 | } | |
1127 | #endif | |
1128 | } | |
1129 | ||
1130 | #ifndef __U_BOOT__ | |
1131 | static void setup_file_in_str(struct in_str *i, FILE *f) | |
1132 | #else | |
1133 | static void setup_file_in_str(struct in_str *i) | |
1134 | #endif | |
1135 | { | |
1136 | i->peek = file_peek; | |
1137 | i->get = file_get; | |
1138 | i->__promptme=1; | |
1139 | i->promptmode=1; | |
1140 | #ifndef __U_BOOT__ | |
1141 | i->file = f; | |
1142 | #endif | |
1143 | i->p = NULL; | |
1144 | } | |
1145 | ||
1146 | static void setup_string_in_str(struct in_str *i, const char *s) | |
1147 | { | |
1148 | i->peek = static_peek; | |
1149 | i->get = static_get; | |
1150 | i->__promptme=1; | |
1151 | i->promptmode=1; | |
1152 | i->p = s; | |
1153 | } | |
1154 | ||
1155 | #ifndef __U_BOOT__ | |
1156 | static void mark_open(int fd) | |
1157 | { | |
1158 | struct close_me *new = xmalloc(sizeof(struct close_me)); | |
1159 | new->fd = fd; | |
1160 | new->next = close_me_head; | |
1161 | close_me_head = new; | |
1162 | } | |
1163 | ||
1164 | static void mark_closed(int fd) | |
1165 | { | |
1166 | struct close_me *tmp; | |
1167 | if (close_me_head == NULL || close_me_head->fd != fd) | |
1168 | error_msg_and_die("corrupt close_me"); | |
1169 | tmp = close_me_head; | |
1170 | close_me_head = close_me_head->next; | |
1171 | free(tmp); | |
1172 | } | |
1173 | ||
d0fb80c3 | 1174 | static void close_all(void) |
fe8c2806 WD |
1175 | { |
1176 | struct close_me *c; | |
1177 | for (c=close_me_head; c; c=c->next) { | |
1178 | close(c->fd); | |
1179 | } | |
1180 | close_me_head = NULL; | |
1181 | } | |
1182 | ||
1183 | /* squirrel != NULL means we squirrel away copies of stdin, stdout, | |
1184 | * and stderr if they are redirected. */ | |
1185 | static int setup_redirects(struct child_prog *prog, int squirrel[]) | |
1186 | { | |
1187 | int openfd, mode; | |
1188 | struct redir_struct *redir; | |
1189 | ||
1190 | for (redir=prog->redirects; redir; redir=redir->next) { | |
1191 | if (redir->dup == -1 && redir->word.gl_pathv == NULL) { | |
1192 | /* something went wrong in the parse. Pretend it didn't happen */ | |
1193 | continue; | |
1194 | } | |
1195 | if (redir->dup == -1) { | |
1196 | mode=redir_table[redir->type].mode; | |
1197 | openfd = open(redir->word.gl_pathv[0], mode, 0666); | |
1198 | if (openfd < 0) { | |
1199 | /* this could get lost if stderr has been redirected, but | |
1200 | bash and ash both lose it as well (though zsh doesn't!) */ | |
1201 | perror_msg("error opening %s", redir->word.gl_pathv[0]); | |
1202 | return 1; | |
1203 | } | |
1204 | } else { | |
1205 | openfd = redir->dup; | |
1206 | } | |
1207 | ||
1208 | if (openfd != redir->fd) { | |
1209 | if (squirrel && redir->fd < 3) { | |
1210 | squirrel[redir->fd] = dup(redir->fd); | |
1211 | } | |
1212 | if (openfd == -3) { | |
1213 | close(openfd); | |
1214 | } else { | |
1215 | dup2(openfd, redir->fd); | |
1216 | if (redir->dup == -1) | |
1217 | close (openfd); | |
1218 | } | |
1219 | } | |
1220 | } | |
1221 | return 0; | |
1222 | } | |
1223 | ||
1224 | static void restore_redirects(int squirrel[]) | |
1225 | { | |
1226 | int i, fd; | |
1227 | for (i=0; i<3; i++) { | |
1228 | fd = squirrel[i]; | |
1229 | if (fd != -1) { | |
1230 | /* No error checking. I sure wouldn't know what | |
1231 | * to do with an error if I found one! */ | |
1232 | dup2(fd, i); | |
1233 | close(fd); | |
1234 | } | |
1235 | } | |
1236 | } | |
1237 | ||
1238 | /* never returns */ | |
1239 | /* XXX no exit() here. If you don't exec, use _exit instead. | |
1240 | * The at_exit handlers apparently confuse the calling process, | |
1241 | * in particular stdin handling. Not sure why? */ | |
1242 | static void pseudo_exec(struct child_prog *child) | |
1243 | { | |
1244 | int i, rcode; | |
1245 | char *p; | |
1246 | struct built_in_command *x; | |
1247 | if (child->argv) { | |
1248 | for (i=0; is_assignment(child->argv[i]); i++) { | |
1249 | debug_printf("pid %d environment modification: %s\n",getpid(),child->argv[i]); | |
1250 | p = insert_var_value(child->argv[i]); | |
1251 | putenv(strdup(p)); | |
1252 | if (p != child->argv[i]) free(p); | |
1253 | } | |
1254 | child->argv+=i; /* XXX this hack isn't so horrible, since we are about | |
8bde7f77 WD |
1255 | to exit, and therefore don't need to keep data |
1256 | structures consistent for free() use. */ | |
fe8c2806 WD |
1257 | /* If a variable is assigned in a forest, and nobody listens, |
1258 | * was it ever really set? | |
1259 | */ | |
1260 | if (child->argv[0] == NULL) { | |
1261 | _exit(EXIT_SUCCESS); | |
1262 | } | |
1263 | ||
1264 | /* | |
1265 | * Check if the command matches any of the builtins. | |
1266 | * Depending on context, this might be redundant. But it's | |
1267 | * easier to waste a few CPU cycles than it is to figure out | |
1268 | * if this is one of those cases. | |
1269 | */ | |
1270 | for (x = bltins; x->cmd; x++) { | |
1271 | if (strcmp(child->argv[0], x->cmd) == 0 ) { | |
1272 | debug_printf("builtin exec %s\n", child->argv[0]); | |
1273 | rcode = x->function(child); | |
1274 | fflush(stdout); | |
1275 | _exit(rcode); | |
1276 | } | |
1277 | } | |
1278 | ||
1279 | /* Check if the command matches any busybox internal commands | |
1280 | * ("applets") here. | |
1281 | * FIXME: This feature is not 100% safe, since | |
1282 | * BusyBox is not fully reentrant, so we have no guarantee the things | |
1283 | * from the .bss are still zeroed, or that things from .data are still | |
1284 | * at their defaults. We could exec ourself from /proc/self/exe, but I | |
1285 | * really dislike relying on /proc for things. We could exec ourself | |
1286 | * from global_argv[0], but if we are in a chroot, we may not be able | |
1287 | * to find ourself... */ | |
d0fb80c3 | 1288 | #ifdef CONFIG_FEATURE_SH_STANDALONE_SHELL |
fe8c2806 WD |
1289 | { |
1290 | int argc_l; | |
1291 | char** argv_l=child->argv; | |
1292 | char *name = child->argv[0]; | |
1293 | ||
d0fb80c3 | 1294 | #ifdef CONFIG_FEATURE_SH_APPLETS_ALWAYS_WIN |
fe8c2806 WD |
1295 | /* Following discussions from November 2000 on the busybox mailing |
1296 | * list, the default configuration, (without | |
1297 | * get_last_path_component()) lets the user force use of an | |
1298 | * external command by specifying the full (with slashes) filename. | |
d0fb80c3 | 1299 | * If you enable CONFIG_FEATURE_SH_APPLETS_ALWAYS_WIN then applets |
fe8c2806 WD |
1300 | * _aways_ override external commands, so if you want to run |
1301 | * /bin/cat, it will use BusyBox cat even if /bin/cat exists on the | |
1302 | * filesystem and is _not_ busybox. Some systems may want this, | |
1303 | * most do not. */ | |
1304 | name = get_last_path_component(name); | |
1305 | #endif | |
1306 | /* Count argc for use in a second... */ | |
1307 | for(argc_l=0;*argv_l!=NULL; argv_l++, argc_l++); | |
1308 | optind = 1; | |
1309 | debug_printf("running applet %s\n", name); | |
1310 | run_applet_by_name(name, argc_l, child->argv); | |
1311 | } | |
1312 | #endif | |
1313 | debug_printf("exec of %s\n",child->argv[0]); | |
1314 | execvp(child->argv[0],child->argv); | |
1315 | perror_msg("couldn't exec: %s",child->argv[0]); | |
1316 | _exit(1); | |
1317 | } else if (child->group) { | |
1318 | debug_printf("runtime nesting to group\n"); | |
1319 | interactive=0; /* crucial!!!! */ | |
1320 | rcode = run_list_real(child->group); | |
1321 | /* OK to leak memory by not calling free_pipe_list, | |
1322 | * since this process is about to exit */ | |
1323 | _exit(rcode); | |
1324 | } else { | |
1325 | /* Can happen. See what bash does with ">foo" by itself. */ | |
1326 | debug_printf("trying to pseudo_exec null command\n"); | |
1327 | _exit(EXIT_SUCCESS); | |
1328 | } | |
1329 | } | |
1330 | ||
1331 | static void insert_bg_job(struct pipe *pi) | |
1332 | { | |
1333 | struct pipe *thejob; | |
1334 | ||
1335 | /* Linear search for the ID of the job to use */ | |
1336 | pi->jobid = 1; | |
1337 | for (thejob = job_list; thejob; thejob = thejob->next) | |
1338 | if (thejob->jobid >= pi->jobid) | |
1339 | pi->jobid = thejob->jobid + 1; | |
1340 | ||
1341 | /* add thejob to the list of running jobs */ | |
1342 | if (!job_list) { | |
1343 | thejob = job_list = xmalloc(sizeof(*thejob)); | |
1344 | } else { | |
1345 | for (thejob = job_list; thejob->next; thejob = thejob->next) /* nothing */; | |
1346 | thejob->next = xmalloc(sizeof(*thejob)); | |
1347 | thejob = thejob->next; | |
1348 | } | |
1349 | ||
1350 | /* physically copy the struct job */ | |
1351 | memcpy(thejob, pi, sizeof(struct pipe)); | |
1352 | thejob->next = NULL; | |
1353 | thejob->running_progs = thejob->num_progs; | |
1354 | thejob->stopped_progs = 0; | |
1355 | thejob->text = xmalloc(BUFSIZ); /* cmdedit buffer size */ | |
1356 | ||
1357 | /*if (pi->progs[0] && pi->progs[0].argv && pi->progs[0].argv[0]) */ | |
1358 | { | |
1359 | char *bar=thejob->text; | |
1360 | char **foo=pi->progs[0].argv; | |
1361 | while(foo && *foo) { | |
1362 | bar += sprintf(bar, "%s ", *foo++); | |
1363 | } | |
1364 | } | |
1365 | ||
1366 | /* we don't wait for background thejobs to return -- append it | |
1367 | to the list of backgrounded thejobs and leave it alone */ | |
1368 | printf("[%d] %d\n", thejob->jobid, thejob->progs[0].pid); | |
1369 | last_bg_pid = thejob->progs[0].pid; | |
1370 | last_jobid = thejob->jobid; | |
1371 | } | |
1372 | ||
1373 | /* remove a backgrounded job */ | |
1374 | static void remove_bg_job(struct pipe *pi) | |
1375 | { | |
1376 | struct pipe *prev_pipe; | |
1377 | ||
1378 | if (pi == job_list) { | |
1379 | job_list = pi->next; | |
1380 | } else { | |
1381 | prev_pipe = job_list; | |
1382 | while (prev_pipe->next != pi) | |
1383 | prev_pipe = prev_pipe->next; | |
1384 | prev_pipe->next = pi->next; | |
1385 | } | |
1386 | if (job_list) | |
1387 | last_jobid = job_list->jobid; | |
1388 | else | |
1389 | last_jobid = 0; | |
1390 | ||
1391 | pi->stopped_progs = 0; | |
1392 | free_pipe(pi, 0); | |
1393 | free(pi); | |
1394 | } | |
1395 | ||
1396 | /* Checks to see if any processes have exited -- if they | |
1397 | have, figure out why and see if a job has completed */ | |
1398 | static int checkjobs(struct pipe* fg_pipe) | |
1399 | { | |
1400 | int attributes; | |
1401 | int status; | |
1402 | int prognum = 0; | |
1403 | struct pipe *pi; | |
1404 | pid_t childpid; | |
1405 | ||
1406 | attributes = WUNTRACED; | |
1407 | if (fg_pipe==NULL) { | |
1408 | attributes |= WNOHANG; | |
1409 | } | |
1410 | ||
1411 | while ((childpid = waitpid(-1, &status, attributes)) > 0) { | |
1412 | if (fg_pipe) { | |
1413 | int i, rcode = 0; | |
1414 | for (i=0; i < fg_pipe->num_progs; i++) { | |
1415 | if (fg_pipe->progs[i].pid == childpid) { | |
1416 | if (i==fg_pipe->num_progs-1) | |
1417 | rcode=WEXITSTATUS(status); | |
1418 | (fg_pipe->num_progs)--; | |
1419 | return(rcode); | |
1420 | } | |
1421 | } | |
1422 | } | |
1423 | ||
1424 | for (pi = job_list; pi; pi = pi->next) { | |
1425 | prognum = 0; | |
1426 | while (prognum < pi->num_progs && pi->progs[prognum].pid != childpid) { | |
1427 | prognum++; | |
1428 | } | |
1429 | if (prognum < pi->num_progs) | |
1430 | break; | |
1431 | } | |
1432 | ||
1433 | if(pi==NULL) { | |
1434 | debug_printf("checkjobs: pid %d was not in our list!\n", childpid); | |
1435 | continue; | |
1436 | } | |
1437 | ||
1438 | if (WIFEXITED(status) || WIFSIGNALED(status)) { | |
1439 | /* child exited */ | |
1440 | pi->running_progs--; | |
1441 | pi->progs[prognum].pid = 0; | |
1442 | ||
1443 | if (!pi->running_progs) { | |
1444 | printf(JOB_STATUS_FORMAT, pi->jobid, "Done", pi->text); | |
1445 | remove_bg_job(pi); | |
1446 | } | |
1447 | } else { | |
1448 | /* child stopped */ | |
1449 | pi->stopped_progs++; | |
1450 | pi->progs[prognum].is_stopped = 1; | |
1451 | ||
1452 | #if 0 | |
1453 | /* Printing this stuff is a pain, since it tends to | |
1454 | * overwrite the prompt an inconveinient moments. So | |
1455 | * don't do that. */ | |
1456 | if (pi->stopped_progs == pi->num_progs) { | |
1457 | printf("\n"JOB_STATUS_FORMAT, pi->jobid, "Stopped", pi->text); | |
1458 | } | |
1459 | #endif | |
1460 | } | |
1461 | } | |
1462 | ||
1463 | if (childpid == -1 && errno != ECHILD) | |
1464 | perror_msg("waitpid"); | |
1465 | ||
1466 | /* move the shell to the foreground */ | |
1467 | /*if (interactive && tcsetpgrp(shell_terminal, getpgid(0))) */ | |
1468 | /* perror_msg("tcsetpgrp-2"); */ | |
1469 | return -1; | |
1470 | } | |
1471 | ||
1472 | /* Figure out our controlling tty, checking in order stderr, | |
1473 | * stdin, and stdout. If check_pgrp is set, also check that | |
1474 | * we belong to the foreground process group associated with | |
1475 | * that tty. The value of shell_terminal is needed in order to call | |
1476 | * tcsetpgrp(shell_terminal, ...); */ | |
1477 | void controlling_tty(int check_pgrp) | |
1478 | { | |
1479 | pid_t curpgrp; | |
1480 | ||
1481 | if ((curpgrp = tcgetpgrp(shell_terminal = 2)) < 0 | |
1482 | && (curpgrp = tcgetpgrp(shell_terminal = 0)) < 0 | |
1483 | && (curpgrp = tcgetpgrp(shell_terminal = 1)) < 0) | |
1484 | goto shell_terminal_error; | |
1485 | ||
1486 | if (check_pgrp && curpgrp != getpgid(0)) | |
1487 | goto shell_terminal_error; | |
1488 | ||
1489 | return; | |
1490 | ||
1491 | shell_terminal_error: | |
1492 | shell_terminal = -1; | |
1493 | return; | |
1494 | } | |
1495 | #endif | |
1496 | ||
1497 | /* run_pipe_real() starts all the jobs, but doesn't wait for anything | |
1498 | * to finish. See checkjobs(). | |
1499 | * | |
1500 | * return code is normally -1, when the caller has to wait for children | |
1501 | * to finish to determine the exit status of the pipe. If the pipe | |
1502 | * is a simple builtin command, however, the action is done by the | |
1503 | * time run_pipe_real returns, and the exit code is provided as the | |
1504 | * return value. | |
1505 | * | |
1506 | * The input of the pipe is always stdin, the output is always | |
1507 | * stdout. The outpipe[] mechanism in BusyBox-0.48 lash is bogus, | |
1508 | * because it tries to avoid running the command substitution in | |
1509 | * subshell, when that is in fact necessary. The subshell process | |
1510 | * now has its stdout directed to the input of the appropriate pipe, | |
1511 | * so this routine is noticeably simpler. | |
1512 | */ | |
1513 | static int run_pipe_real(struct pipe *pi) | |
1514 | { | |
1515 | int i; | |
1516 | #ifndef __U_BOOT__ | |
1517 | int nextin, nextout; | |
1518 | int pipefds[2]; /* pipefds[0] is for reading */ | |
1519 | struct child_prog *child; | |
1520 | struct built_in_command *x; | |
1521 | char *p; | |
d0fb80c3 WD |
1522 | # if __GNUC__ |
1523 | /* Avoid longjmp clobbering */ | |
1524 | (void) &i; | |
1525 | (void) &nextin; | |
1526 | (void) &nextout; | |
1527 | (void) &child; | |
1528 | # endif | |
fe8c2806 WD |
1529 | #else |
1530 | int nextin; | |
1531 | int flag = do_repeat ? CMD_FLAG_REPEAT : 0; | |
1532 | struct child_prog *child; | |
fe8c2806 | 1533 | char *p; |
d0fb80c3 WD |
1534 | # if __GNUC__ |
1535 | /* Avoid longjmp clobbering */ | |
1536 | (void) &i; | |
1537 | (void) &nextin; | |
1538 | (void) &child; | |
1539 | # endif | |
1540 | #endif /* __U_BOOT__ */ | |
fe8c2806 WD |
1541 | |
1542 | nextin = 0; | |
1543 | #ifndef __U_BOOT__ | |
1544 | pi->pgrp = -1; | |
1545 | #endif | |
1546 | ||
1547 | /* Check if this is a simple builtin (not part of a pipe). | |
1548 | * Builtins within pipes have to fork anyway, and are handled in | |
1549 | * pseudo_exec. "echo foo | read bar" doesn't work on bash, either. | |
1550 | */ | |
1551 | if (pi->num_progs == 1) child = & (pi->progs[0]); | |
1552 | #ifndef __U_BOOT__ | |
1553 | if (pi->num_progs == 1 && child->group && child->subshell == 0) { | |
1554 | int squirrel[] = {-1, -1, -1}; | |
1555 | int rcode; | |
1556 | debug_printf("non-subshell grouping\n"); | |
1557 | setup_redirects(child, squirrel); | |
1558 | /* XXX could we merge code with following builtin case, | |
1559 | * by creating a pseudo builtin that calls run_list_real? */ | |
1560 | rcode = run_list_real(child->group); | |
1561 | restore_redirects(squirrel); | |
1562 | #else | |
1563 | if (pi->num_progs == 1 && child->group) { | |
1564 | int rcode; | |
1565 | debug_printf("non-subshell grouping\n"); | |
1566 | rcode = run_list_real(child->group); | |
1567 | #endif | |
1568 | return rcode; | |
1569 | } else if (pi->num_progs == 1 && pi->progs[0].argv != NULL) { | |
1570 | for (i=0; is_assignment(child->argv[i]); i++) { /* nothing */ } | |
1571 | if (i!=0 && child->argv[i]==NULL) { | |
1572 | /* assignments, but no command: set the local environment */ | |
1573 | for (i=0; child->argv[i]!=NULL; i++) { | |
1574 | ||
1575 | /* Ok, this case is tricky. We have to decide if this is a | |
1576 | * local variable, or an already exported variable. If it is | |
1577 | * already exported, we have to export the new value. If it is | |
1578 | * not exported, we need only set this as a local variable. | |
1579 | * This junk is all to decide whether or not to export this | |
1580 | * variable. */ | |
1581 | int export_me=0; | |
1582 | char *name, *value; | |
1583 | name = xstrdup(child->argv[i]); | |
1584 | debug_printf("Local environment set: %s\n", name); | |
1585 | value = strchr(name, '='); | |
1586 | if (value) | |
1587 | *value=0; | |
1588 | #ifndef __U_BOOT__ | |
1589 | if ( get_local_var(name)) { | |
1590 | export_me=1; | |
1591 | } | |
1592 | #endif | |
1593 | free(name); | |
1594 | p = insert_var_value(child->argv[i]); | |
1595 | set_local_var(p, export_me); | |
1596 | if (p != child->argv[i]) free(p); | |
1597 | } | |
1598 | return EXIT_SUCCESS; /* don't worry about errors in set_local_var() yet */ | |
1599 | } | |
1600 | for (i = 0; is_assignment(child->argv[i]); i++) { | |
1601 | p = insert_var_value(child->argv[i]); | |
1602 | #ifndef __U_BOOT__ | |
1603 | putenv(strdup(p)); | |
1604 | #else | |
1605 | set_local_var(p, 0); | |
1606 | #endif | |
1607 | if (p != child->argv[i]) { | |
1608 | child->sp--; | |
1609 | free(p); | |
1610 | } | |
1611 | } | |
1612 | if (child->sp) { | |
1613 | char * str = NULL; | |
1614 | ||
fe9ca3d3 SW |
1615 | str = make_string(child->argv + i, |
1616 | child->argv_nonnull + i); | |
fe8c2806 WD |
1617 | parse_string_outer(str, FLAG_EXIT_FROM_LOOP | FLAG_REPARSING); |
1618 | free(str); | |
1619 | return last_return_code; | |
1620 | } | |
1621 | #ifndef __U_BOOT__ | |
1622 | for (x = bltins; x->cmd; x++) { | |
1623 | if (strcmp(child->argv[i], x->cmd) == 0 ) { | |
1624 | int squirrel[] = {-1, -1, -1}; | |
1625 | int rcode; | |
1626 | if (x->function == builtin_exec && child->argv[i+1]==NULL) { | |
1627 | debug_printf("magic exec\n"); | |
1628 | setup_redirects(child,NULL); | |
1629 | return EXIT_SUCCESS; | |
1630 | } | |
1631 | debug_printf("builtin inline %s\n", child->argv[0]); | |
1632 | /* XXX setup_redirects acts on file descriptors, not FILEs. | |
1633 | * This is perfect for work that comes after exec(). | |
1634 | * Is it really safe for inline use? Experimentally, | |
1635 | * things seem to work with glibc. */ | |
1636 | setup_redirects(child, squirrel); | |
7344f912 SG |
1637 | |
1638 | child->argv += i; /* XXX horrible hack */ | |
1639 | rcode = x->function(child); | |
1640 | /* XXX restore hack so free() can work right */ | |
1641 | child->argv -= i; | |
1642 | restore_redirects(squirrel); | |
1643 | } | |
1644 | return rcode; | |
1645 | } | |
fe8c2806 | 1646 | #else |
9d12d5d4 SG |
1647 | /* check ";", because ,example , argv consist from |
1648 | * "help;flinfo" must not execute | |
1649 | */ | |
1650 | if (strchr(child->argv[i], ';')) { | |
1651 | printf("Unknown command '%s' - try 'help' or use " | |
1652 | "'run' command\n", child->argv[i]); | |
1653 | return -1; | |
fe8c2806 | 1654 | } |
9d12d5d4 SG |
1655 | /* Process the command */ |
1656 | return cmd_process(flag, child->argc, child->argv, | |
34765e88 | 1657 | &flag_repeat, NULL); |
9d12d5d4 | 1658 | #endif |
fe8c2806 | 1659 | } |
9d12d5d4 | 1660 | #ifndef __U_BOOT__ |
fe8c2806 WD |
1661 | |
1662 | for (i = 0; i < pi->num_progs; i++) { | |
1663 | child = & (pi->progs[i]); | |
1664 | ||
1665 | /* pipes are inserted between pairs of commands */ | |
1666 | if ((i + 1) < pi->num_progs) { | |
1667 | if (pipe(pipefds)<0) perror_msg_and_die("pipe"); | |
1668 | nextout = pipefds[1]; | |
1669 | } else { | |
1670 | nextout=1; | |
1671 | pipefds[0] = -1; | |
1672 | } | |
1673 | ||
1674 | /* XXX test for failed fork()? */ | |
1675 | if (!(child->pid = fork())) { | |
1676 | /* Set the handling for job control signals back to the default. */ | |
1677 | signal(SIGINT, SIG_DFL); | |
1678 | signal(SIGQUIT, SIG_DFL); | |
1679 | signal(SIGTERM, SIG_DFL); | |
1680 | signal(SIGTSTP, SIG_DFL); | |
1681 | signal(SIGTTIN, SIG_DFL); | |
1682 | signal(SIGTTOU, SIG_DFL); | |
1683 | signal(SIGCHLD, SIG_DFL); | |
1684 | ||
1685 | close_all(); | |
1686 | ||
1687 | if (nextin != 0) { | |
1688 | dup2(nextin, 0); | |
1689 | close(nextin); | |
1690 | } | |
1691 | if (nextout != 1) { | |
1692 | dup2(nextout, 1); | |
1693 | close(nextout); | |
1694 | } | |
1695 | if (pipefds[0]!=-1) { | |
1696 | close(pipefds[0]); /* opposite end of our output pipe */ | |
1697 | } | |
1698 | ||
1699 | /* Like bash, explicit redirects override pipes, | |
1700 | * and the pipe fd is available for dup'ing. */ | |
1701 | setup_redirects(child,NULL); | |
1702 | ||
1703 | if (interactive && pi->followup!=PIPE_BG) { | |
1704 | /* If we (the child) win the race, put ourselves in the process | |
1705 | * group whose leader is the first process in this pipe. */ | |
1706 | if (pi->pgrp < 0) { | |
1707 | pi->pgrp = getpid(); | |
1708 | } | |
1709 | if (setpgid(0, pi->pgrp) == 0) { | |
1710 | tcsetpgrp(2, pi->pgrp); | |
1711 | } | |
1712 | } | |
1713 | ||
1714 | pseudo_exec(child); | |
1715 | } | |
1716 | ||
1717 | ||
1718 | /* put our child in the process group whose leader is the | |
1719 | first process in this pipe */ | |
1720 | if (pi->pgrp < 0) { | |
1721 | pi->pgrp = child->pid; | |
1722 | } | |
1723 | /* Don't check for errors. The child may be dead already, | |
1724 | * in which case setpgid returns error code EACCES. */ | |
1725 | setpgid(child->pid, pi->pgrp); | |
1726 | ||
1727 | if (nextin != 0) | |
1728 | close(nextin); | |
1729 | if (nextout != 1) | |
1730 | close(nextout); | |
1731 | ||
1732 | /* If there isn't another process, nextin is garbage | |
1733 | but it doesn't matter */ | |
1734 | nextin = pipefds[0]; | |
1735 | } | |
1736 | #endif | |
1737 | return -1; | |
1738 | } | |
1739 | ||
1740 | static int run_list_real(struct pipe *pi) | |
1741 | { | |
1742 | char *save_name = NULL; | |
1743 | char **list = NULL; | |
1744 | char **save_list = NULL; | |
1745 | struct pipe *rpipe; | |
1746 | int flag_rep = 0; | |
1747 | #ifndef __U_BOOT__ | |
1748 | int save_num_progs; | |
1749 | #endif | |
1750 | int rcode=0, flag_skip=1; | |
1751 | int flag_restore = 0; | |
1752 | int if_code=0, next_if_code=0; /* need double-buffer to handle elif */ | |
1753 | reserved_style rmode, skip_more_in_this_rmode=RES_XXXX; | |
1754 | /* check syntax for "for" */ | |
1755 | for (rpipe = pi; rpipe; rpipe = rpipe->next) { | |
1756 | if ((rpipe->r_mode == RES_IN || | |
1757 | rpipe->r_mode == RES_FOR) && | |
1758 | (rpipe->next == NULL)) { | |
1759 | syntax(); | |
1760 | #ifdef __U_BOOT__ | |
1761 | flag_repeat = 0; | |
1762 | #endif | |
1763 | return 1; | |
1764 | } | |
1765 | if ((rpipe->r_mode == RES_IN && | |
1766 | (rpipe->next->r_mode == RES_IN && | |
1767 | rpipe->next->progs->argv != NULL))|| | |
1768 | (rpipe->r_mode == RES_FOR && | |
1769 | rpipe->next->r_mode != RES_IN)) { | |
1770 | syntax(); | |
1771 | #ifdef __U_BOOT__ | |
1772 | flag_repeat = 0; | |
1773 | #endif | |
1774 | return 1; | |
1775 | } | |
1776 | } | |
1777 | for (; pi; pi = (flag_restore != 0) ? rpipe : pi->next) { | |
1778 | if (pi->r_mode == RES_WHILE || pi->r_mode == RES_UNTIL || | |
1779 | pi->r_mode == RES_FOR) { | |
1780 | #ifdef __U_BOOT__ | |
1781 | /* check Ctrl-C */ | |
1782 | ctrlc(); | |
1783 | if ((had_ctrlc())) { | |
1784 | return 1; | |
1785 | } | |
1786 | #endif | |
1787 | flag_restore = 0; | |
1788 | if (!rpipe) { | |
1789 | flag_rep = 0; | |
1790 | rpipe = pi; | |
1791 | } | |
1792 | } | |
1793 | rmode = pi->r_mode; | |
1794 | 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); | |
1795 | if (rmode == skip_more_in_this_rmode && flag_skip) { | |
1796 | if (pi->followup == PIPE_SEQ) flag_skip=0; | |
1797 | continue; | |
1798 | } | |
1799 | flag_skip = 1; | |
1800 | skip_more_in_this_rmode = RES_XXXX; | |
1801 | if (rmode == RES_THEN || rmode == RES_ELSE) if_code = next_if_code; | |
1802 | if (rmode == RES_THEN && if_code) continue; | |
1803 | if (rmode == RES_ELSE && !if_code) continue; | |
56b86bf0 | 1804 | if (rmode == RES_ELIF && !if_code) break; |
fe8c2806 WD |
1805 | if (rmode == RES_FOR && pi->num_progs) { |
1806 | if (!list) { | |
1807 | /* if no variable values after "in" we skip "for" */ | |
1808 | if (!pi->next->progs->argv) continue; | |
1809 | /* create list of variable values */ | |
1810 | list = make_list_in(pi->next->progs->argv, | |
1811 | pi->progs->argv[0]); | |
1812 | save_list = list; | |
1813 | save_name = pi->progs->argv[0]; | |
1814 | pi->progs->argv[0] = NULL; | |
1815 | flag_rep = 1; | |
1816 | } | |
1817 | if (!(*list)) { | |
1818 | free(pi->progs->argv[0]); | |
1819 | free(save_list); | |
1820 | list = NULL; | |
1821 | flag_rep = 0; | |
1822 | pi->progs->argv[0] = save_name; | |
1823 | #ifndef __U_BOOT__ | |
1824 | pi->progs->glob_result.gl_pathv[0] = | |
1825 | pi->progs->argv[0]; | |
1826 | #endif | |
1827 | continue; | |
1828 | } else { | |
1829 | /* insert new value from list for variable */ | |
1830 | if (pi->progs->argv[0]) | |
1831 | free(pi->progs->argv[0]); | |
1832 | pi->progs->argv[0] = *list++; | |
1833 | #ifndef __U_BOOT__ | |
1834 | pi->progs->glob_result.gl_pathv[0] = | |
1835 | pi->progs->argv[0]; | |
1836 | #endif | |
1837 | } | |
1838 | } | |
1839 | if (rmode == RES_IN) continue; | |
1840 | if (rmode == RES_DO) { | |
1841 | if (!flag_rep) continue; | |
1842 | } | |
930e4254 | 1843 | if (rmode == RES_DONE) { |
fe8c2806 WD |
1844 | if (flag_rep) { |
1845 | flag_restore = 1; | |
1846 | } else { | |
1847 | rpipe = NULL; | |
1848 | } | |
1849 | } | |
1850 | if (pi->num_progs == 0) continue; | |
1851 | #ifndef __U_BOOT__ | |
1852 | save_num_progs = pi->num_progs; /* save number of programs */ | |
1853 | #endif | |
1854 | rcode = run_pipe_real(pi); | |
1855 | debug_printf("run_pipe_real returned %d\n",rcode); | |
1856 | #ifndef __U_BOOT__ | |
1857 | if (rcode!=-1) { | |
1858 | /* We only ran a builtin: rcode was set by the return value | |
1859 | * of run_pipe_real(), and we don't need to wait for anything. */ | |
1860 | } else if (pi->followup==PIPE_BG) { | |
1861 | /* XXX check bash's behavior with nontrivial pipes */ | |
1862 | /* XXX compute jobid */ | |
1863 | /* XXX what does bash do with attempts to background builtins? */ | |
1864 | insert_bg_job(pi); | |
1865 | rcode = EXIT_SUCCESS; | |
1866 | } else { | |
1867 | if (interactive) { | |
1868 | /* move the new process group into the foreground */ | |
1869 | if (tcsetpgrp(shell_terminal, pi->pgrp) && errno != ENOTTY) | |
1870 | perror_msg("tcsetpgrp-3"); | |
1871 | rcode = checkjobs(pi); | |
1872 | /* move the shell to the foreground */ | |
1873 | if (tcsetpgrp(shell_terminal, getpgid(0)) && errno != ENOTTY) | |
1874 | perror_msg("tcsetpgrp-4"); | |
1875 | } else { | |
1876 | rcode = checkjobs(pi); | |
1877 | } | |
1878 | debug_printf("checkjobs returned %d\n",rcode); | |
1879 | } | |
1880 | last_return_code=rcode; | |
1881 | #else | |
c26e454d WD |
1882 | if (rcode < -1) { |
1883 | last_return_code = -rcode - 2; | |
1884 | return -2; /* exit */ | |
1885 | } | |
fe8c2806 WD |
1886 | last_return_code=(rcode == 0) ? 0 : 1; |
1887 | #endif | |
1888 | #ifndef __U_BOOT__ | |
1889 | pi->num_progs = save_num_progs; /* restore number of programs */ | |
1890 | #endif | |
1891 | if ( rmode == RES_IF || rmode == RES_ELIF ) | |
1892 | next_if_code=rcode; /* can be overwritten a number of times */ | |
1893 | if (rmode == RES_WHILE) | |
1894 | flag_rep = !last_return_code; | |
1895 | if (rmode == RES_UNTIL) | |
1896 | flag_rep = last_return_code; | |
1897 | if ( (rcode==EXIT_SUCCESS && pi->followup==PIPE_OR) || | |
1898 | (rcode!=EXIT_SUCCESS && pi->followup==PIPE_AND) ) | |
1899 | skip_more_in_this_rmode=rmode; | |
1900 | #ifndef __U_BOOT__ | |
1901 | checkjobs(NULL); | |
1902 | #endif | |
1903 | } | |
1904 | return rcode; | |
1905 | } | |
1906 | ||
1907 | /* broken, of course, but OK for testing */ | |
1908 | static char *indenter(int i) | |
1909 | { | |
1910 | static char blanks[]=" "; | |
1911 | return &blanks[sizeof(blanks)-i-1]; | |
1912 | } | |
1913 | ||
1914 | /* return code is the exit status of the pipe */ | |
1915 | static int free_pipe(struct pipe *pi, int indent) | |
1916 | { | |
1917 | char **p; | |
1918 | struct child_prog *child; | |
1919 | #ifndef __U_BOOT__ | |
1920 | struct redir_struct *r, *rnext; | |
1921 | #endif | |
1922 | int a, i, ret_code=0; | |
1923 | char *ind = indenter(indent); | |
1924 | ||
1925 | #ifndef __U_BOOT__ | |
1926 | if (pi->stopped_progs > 0) | |
1927 | return ret_code; | |
1928 | final_printf("%s run pipe: (pid %d)\n",ind,getpid()); | |
1929 | #endif | |
1930 | for (i=0; i<pi->num_progs; i++) { | |
1931 | child = &pi->progs[i]; | |
1932 | final_printf("%s command %d:\n",ind,i); | |
1933 | if (child->argv) { | |
1934 | for (a=0,p=child->argv; *p; a++,p++) { | |
1935 | final_printf("%s argv[%d] = %s\n",ind,a,*p); | |
1936 | } | |
1937 | #ifndef __U_BOOT__ | |
1938 | globfree(&child->glob_result); | |
1939 | #else | |
197324d7 | 1940 | for (a = 0; a < child->argc; a++) { |
8bde7f77 WD |
1941 | free(child->argv[a]); |
1942 | } | |
fe9ca3d3 SW |
1943 | free(child->argv); |
1944 | free(child->argv_nonnull); | |
8bde7f77 | 1945 | child->argc = 0; |
fe8c2806 WD |
1946 | #endif |
1947 | child->argv=NULL; | |
1948 | } else if (child->group) { | |
1949 | #ifndef __U_BOOT__ | |
1950 | final_printf("%s begin group (subshell:%d)\n",ind, child->subshell); | |
1951 | #endif | |
1952 | ret_code = free_pipe_list(child->group,indent+3); | |
1953 | final_printf("%s end group\n",ind); | |
1954 | } else { | |
1955 | final_printf("%s (nil)\n",ind); | |
1956 | } | |
1957 | #ifndef __U_BOOT__ | |
1958 | for (r=child->redirects; r; r=rnext) { | |
1959 | final_printf("%s redirect %d%s", ind, r->fd, redir_table[r->type].descrip); | |
1960 | if (r->dup == -1) { | |
1961 | /* guard against the case >$FOO, where foo is unset or blank */ | |
1962 | if (r->word.gl_pathv) { | |
1963 | final_printf(" %s\n", *r->word.gl_pathv); | |
1964 | globfree(&r->word); | |
1965 | } | |
1966 | } else { | |
1967 | final_printf("&%d\n", r->dup); | |
1968 | } | |
1969 | rnext=r->next; | |
1970 | free(r); | |
1971 | } | |
1972 | child->redirects=NULL; | |
1973 | #endif | |
1974 | } | |
1975 | free(pi->progs); /* children are an array, they get freed all at once */ | |
1976 | pi->progs=NULL; | |
1977 | return ret_code; | |
1978 | } | |
1979 | ||
1980 | static int free_pipe_list(struct pipe *head, int indent) | |
1981 | { | |
1982 | int rcode=0; /* if list has no members */ | |
1983 | struct pipe *pi, *next; | |
1984 | char *ind = indenter(indent); | |
1985 | for (pi=head; pi; pi=next) { | |
1986 | final_printf("%s pipe reserved mode %d\n", ind, pi->r_mode); | |
1987 | rcode = free_pipe(pi, indent); | |
1988 | final_printf("%s pipe followup code %d\n", ind, pi->followup); | |
1989 | next=pi->next; | |
1990 | pi->next=NULL; | |
1991 | free(pi); | |
1992 | } | |
1993 | return rcode; | |
1994 | } | |
1995 | ||
1996 | /* Select which version we will use */ | |
1997 | static int run_list(struct pipe *pi) | |
1998 | { | |
1999 | int rcode=0; | |
2000 | #ifndef __U_BOOT__ | |
2001 | if (fake_mode==0) { | |
2002 | #endif | |
2003 | rcode = run_list_real(pi); | |
2004 | #ifndef __U_BOOT__ | |
2005 | } | |
2006 | #endif | |
2007 | /* free_pipe_list has the side effect of clearing memory | |
2008 | * In the long run that function can be merged with run_list_real, | |
2009 | * but doing that now would hobble the debugging effort. */ | |
2010 | free_pipe_list(pi,0); | |
2011 | return rcode; | |
2012 | } | |
2013 | ||
2014 | /* The API for glob is arguably broken. This routine pushes a non-matching | |
2015 | * string into the output structure, removing non-backslashed backslashes. | |
2016 | * If someone can prove me wrong, by performing this function within the | |
2017 | * original glob(3) api, feel free to rewrite this routine into oblivion. | |
2018 | * Return code (0 vs. GLOB_NOSPACE) matches glob(3). | |
2019 | * XXX broken if the last character is '\\', check that before calling. | |
2020 | */ | |
2021 | #ifndef __U_BOOT__ | |
2022 | static int globhack(const char *src, int flags, glob_t *pglob) | |
2023 | { | |
2024 | int cnt=0, pathc; | |
2025 | const char *s; | |
2026 | char *dest; | |
2027 | for (cnt=1, s=src; s && *s; s++) { | |
2028 | if (*s == '\\') s++; | |
2029 | cnt++; | |
2030 | } | |
2031 | dest = malloc(cnt); | |
2032 | if (!dest) return GLOB_NOSPACE; | |
2033 | if (!(flags & GLOB_APPEND)) { | |
2034 | pglob->gl_pathv=NULL; | |
2035 | pglob->gl_pathc=0; | |
2036 | pglob->gl_offs=0; | |
2037 | pglob->gl_offs=0; | |
2038 | } | |
2039 | pathc = ++pglob->gl_pathc; | |
2040 | pglob->gl_pathv = realloc(pglob->gl_pathv, (pathc+1)*sizeof(*pglob->gl_pathv)); | |
2041 | if (pglob->gl_pathv == NULL) return GLOB_NOSPACE; | |
2042 | pglob->gl_pathv[pathc-1]=dest; | |
2043 | pglob->gl_pathv[pathc]=NULL; | |
2044 | for (s=src; s && *s; s++, dest++) { | |
2045 | if (*s == '\\') s++; | |
2046 | *dest = *s; | |
2047 | } | |
2048 | *dest='\0'; | |
2049 | return 0; | |
2050 | } | |
2051 | ||
2052 | /* XXX broken if the last character is '\\', check that before calling */ | |
2053 | static int glob_needed(const char *s) | |
2054 | { | |
2055 | for (; *s; s++) { | |
2056 | if (*s == '\\') s++; | |
2057 | if (strchr("*[?",*s)) return 1; | |
2058 | } | |
2059 | return 0; | |
2060 | } | |
2061 | ||
2062 | #if 0 | |
2063 | static void globprint(glob_t *pglob) | |
2064 | { | |
2065 | int i; | |
2066 | debug_printf("glob_t at %p:\n", pglob); | |
2067 | debug_printf(" gl_pathc=%d gl_pathv=%p gl_offs=%d gl_flags=%d\n", | |
2068 | pglob->gl_pathc, pglob->gl_pathv, pglob->gl_offs, pglob->gl_flags); | |
2069 | for (i=0; i<pglob->gl_pathc; i++) | |
2070 | debug_printf("pglob->gl_pathv[%d] = %p = %s\n", i, | |
2071 | pglob->gl_pathv[i], pglob->gl_pathv[i]); | |
2072 | } | |
2073 | #endif | |
2074 | ||
2075 | static int xglob(o_string *dest, int flags, glob_t *pglob) | |
2076 | { | |
2077 | int gr; | |
2078 | ||
8bde7f77 | 2079 | /* short-circuit for null word */ |
fe8c2806 | 2080 | /* we can code this better when the debug_printf's are gone */ |
8bde7f77 WD |
2081 | if (dest->length == 0) { |
2082 | if (dest->nonnull) { | |
2083 | /* bash man page calls this an "explicit" null */ | |
2084 | gr = globhack(dest->data, flags, pglob); | |
2085 | debug_printf("globhack returned %d\n",gr); | |
2086 | } else { | |
fe8c2806 WD |
2087 | return 0; |
2088 | } | |
8bde7f77 | 2089 | } else if (glob_needed(dest->data)) { |
fe8c2806 WD |
2090 | gr = glob(dest->data, flags, NULL, pglob); |
2091 | debug_printf("glob returned %d\n",gr); | |
2092 | if (gr == GLOB_NOMATCH) { | |
2093 | /* quote removal, or more accurately, backslash removal */ | |
2094 | gr = globhack(dest->data, flags, pglob); | |
2095 | debug_printf("globhack returned %d\n",gr); | |
2096 | } | |
2097 | } else { | |
2098 | gr = globhack(dest->data, flags, pglob); | |
2099 | debug_printf("globhack returned %d\n",gr); | |
2100 | } | |
2101 | if (gr == GLOB_NOSPACE) | |
2102 | error_msg_and_die("out of memory during glob"); | |
2103 | if (gr != 0) { /* GLOB_ABORTED ? */ | |
2104 | error_msg("glob(3) error %d",gr); | |
2105 | } | |
2106 | /* globprint(glob_target); */ | |
2107 | return gr; | |
2108 | } | |
2109 | #endif | |
2110 | ||
c26e454d WD |
2111 | #ifdef __U_BOOT__ |
2112 | static char *get_dollar_var(char ch); | |
2113 | #endif | |
2114 | ||
fe8c2806 | 2115 | /* This is used to get/check local shell variables */ |
eae3b064 | 2116 | char *get_local_var(const char *s) |
fe8c2806 WD |
2117 | { |
2118 | struct variables *cur; | |
2119 | ||
2120 | if (!s) | |
2121 | return NULL; | |
c26e454d WD |
2122 | |
2123 | #ifdef __U_BOOT__ | |
2124 | if (*s == '$') | |
2125 | return get_dollar_var(s[1]); | |
2126 | #endif | |
2127 | ||
fe8c2806 WD |
2128 | for (cur = top_vars; cur; cur=cur->next) |
2129 | if(strcmp(cur->name, s)==0) | |
2130 | return cur->value; | |
2131 | return NULL; | |
2132 | } | |
2133 | ||
2134 | /* This is used to set local shell variables | |
2135 | flg_export==0 if only local (not exporting) variable | |
2136 | flg_export==1 if "new" exporting environ | |
2137 | flg_export>1 if current startup environ (not call putenv()) */ | |
81473f67 | 2138 | int set_local_var(const char *s, int flg_export) |
fe8c2806 WD |
2139 | { |
2140 | char *name, *value; | |
2141 | int result=0; | |
2142 | struct variables *cur; | |
2143 | ||
c26e454d WD |
2144 | #ifdef __U_BOOT__ |
2145 | /* might be possible! */ | |
2146 | if (!isalpha(*s)) | |
2147 | return -1; | |
2148 | #endif | |
2149 | ||
fe8c2806 WD |
2150 | name=strdup(s); |
2151 | ||
2152 | #ifdef __U_BOOT__ | |
2153 | if (getenv(name) != NULL) { | |
2154 | printf ("ERROR: " | |
2d1a537d | 2155 | "There is a global environment variable with the same name.\n"); |
c26e454d | 2156 | free(name); |
fe8c2806 WD |
2157 | return -1; |
2158 | } | |
2159 | #endif | |
2160 | /* Assume when we enter this function that we are already in | |
2161 | * NAME=VALUE format. So the first order of business is to | |
2162 | * split 's' on the '=' into 'name' and 'value' */ | |
2163 | value = strchr(name, '='); | |
199adb60 | 2164 | if (value == NULL && ++value == NULL) { |
fe8c2806 WD |
2165 | free(name); |
2166 | return -1; | |
2167 | } | |
2168 | *value++ = 0; | |
2169 | ||
2170 | for(cur = top_vars; cur; cur = cur->next) { | |
2171 | if(strcmp(cur->name, name)==0) | |
2172 | break; | |
2173 | } | |
2174 | ||
2175 | if(cur) { | |
2176 | if(strcmp(cur->value, value)==0) { | |
2177 | if(flg_export>0 && cur->flg_export==0) | |
2178 | cur->flg_export=flg_export; | |
2179 | else | |
2180 | result++; | |
2181 | } else { | |
2182 | if(cur->flg_read_only) { | |
2183 | error_msg("%s: readonly variable", name); | |
2184 | result = -1; | |
2185 | } else { | |
2186 | if(flg_export>0 || cur->flg_export>1) | |
2187 | cur->flg_export=1; | |
2188 | free(cur->value); | |
2189 | ||
2190 | cur->value = strdup(value); | |
2191 | } | |
2192 | } | |
2193 | } else { | |
2194 | cur = malloc(sizeof(struct variables)); | |
2195 | if(!cur) { | |
2196 | result = -1; | |
2197 | } else { | |
2198 | cur->name = strdup(name); | |
199adb60 | 2199 | if (cur->name == NULL) { |
fe8c2806 WD |
2200 | free(cur); |
2201 | result = -1; | |
2202 | } else { | |
2203 | struct variables *bottom = top_vars; | |
2204 | cur->value = strdup(value); | |
199adb60 | 2205 | cur->next = NULL; |
fe8c2806 WD |
2206 | cur->flg_export = flg_export; |
2207 | cur->flg_read_only = 0; | |
2208 | while(bottom->next) bottom=bottom->next; | |
2209 | bottom->next = cur; | |
2210 | } | |
2211 | } | |
2212 | } | |
2213 | ||
2214 | #ifndef __U_BOOT__ | |
2215 | if(result==0 && cur->flg_export==1) { | |
2216 | *(value-1) = '='; | |
2217 | result = putenv(name); | |
2218 | } else { | |
2219 | #endif | |
2220 | free(name); | |
2221 | #ifndef __U_BOOT__ | |
2222 | if(result>0) /* equivalent to previous set */ | |
2223 | result = 0; | |
2224 | } | |
2225 | #endif | |
2226 | return result; | |
2227 | } | |
2228 | ||
81473f67 | 2229 | void unset_local_var(const char *name) |
fe8c2806 WD |
2230 | { |
2231 | struct variables *cur; | |
2232 | ||
2233 | if (name) { | |
2234 | for (cur = top_vars; cur; cur=cur->next) { | |
2235 | if(strcmp(cur->name, name)==0) | |
2236 | break; | |
2237 | } | |
199adb60 | 2238 | if (cur != NULL) { |
fe8c2806 WD |
2239 | struct variables *next = top_vars; |
2240 | if(cur->flg_read_only) { | |
2241 | error_msg("%s: readonly variable", name); | |
2242 | return; | |
2243 | } else { | |
81473f67 | 2244 | #ifndef __U_BOOT__ |
fe8c2806 WD |
2245 | if(cur->flg_export) |
2246 | unsetenv(cur->name); | |
81473f67 | 2247 | #endif |
fe8c2806 WD |
2248 | free(cur->name); |
2249 | free(cur->value); | |
2250 | while (next->next != cur) | |
2251 | next = next->next; | |
2252 | next->next = cur->next; | |
2253 | } | |
2254 | free(cur); | |
2255 | } | |
2256 | } | |
2257 | } | |
fe8c2806 WD |
2258 | |
2259 | static int is_assignment(const char *s) | |
2260 | { | |
c26e454d WD |
2261 | if (s == NULL) |
2262 | return 0; | |
2263 | ||
2264 | if (!isalpha(*s)) return 0; | |
fe8c2806 WD |
2265 | ++s; |
2266 | while(isalnum(*s) || *s=='_') ++s; | |
2267 | return *s=='='; | |
2268 | } | |
2269 | ||
2270 | #ifndef __U_BOOT__ | |
2271 | /* the src parameter allows us to peek forward to a possible &n syntax | |
2272 | * for file descriptor duplication, e.g., "2>&1". | |
2273 | * Return code is 0 normally, 1 if a syntax error is detected in src. | |
2274 | * Resource errors (in xmalloc) cause the process to exit */ | |
2275 | static int setup_redirect(struct p_context *ctx, int fd, redir_type style, | |
2276 | struct in_str *input) | |
2277 | { | |
2278 | struct child_prog *child=ctx->child; | |
2279 | struct redir_struct *redir = child->redirects; | |
2280 | struct redir_struct *last_redir=NULL; | |
2281 | ||
2282 | /* Create a new redir_struct and drop it onto the end of the linked list */ | |
2283 | while(redir) { | |
2284 | last_redir=redir; | |
2285 | redir=redir->next; | |
2286 | } | |
2287 | redir = xmalloc(sizeof(struct redir_struct)); | |
2288 | redir->next=NULL; | |
2289 | redir->word.gl_pathv=NULL; | |
2290 | if (last_redir) { | |
2291 | last_redir->next=redir; | |
2292 | } else { | |
2293 | child->redirects=redir; | |
2294 | } | |
2295 | ||
2296 | redir->type=style; | |
2297 | redir->fd= (fd==-1) ? redir_table[style].default_fd : fd ; | |
2298 | ||
2299 | debug_printf("Redirect type %d%s\n", redir->fd, redir_table[style].descrip); | |
2300 | ||
2301 | /* Check for a '2>&1' type redirect */ | |
2302 | redir->dup = redirect_dup_num(input); | |
2303 | if (redir->dup == -2) return 1; /* syntax error */ | |
2304 | if (redir->dup != -1) { | |
2305 | /* Erik had a check here that the file descriptor in question | |
2306 | * is legit; I postpone that to "run time" | |
2307 | * A "-" representation of "close me" shows up as a -3 here */ | |
2308 | debug_printf("Duplicating redirect '%d>&%d'\n", redir->fd, redir->dup); | |
2309 | } else { | |
2310 | /* We do _not_ try to open the file that src points to, | |
2311 | * since we need to return and let src be expanded first. | |
2312 | * Set ctx->pending_redirect, so we know what to do at the | |
2313 | * end of the next parsed word. | |
2314 | */ | |
2315 | ctx->pending_redirect = redir; | |
2316 | } | |
2317 | return 0; | |
2318 | } | |
2319 | #endif | |
2320 | ||
199adb60 KP |
2321 | static struct pipe *new_pipe(void) |
2322 | { | |
fe8c2806 WD |
2323 | struct pipe *pi; |
2324 | pi = xmalloc(sizeof(struct pipe)); | |
2325 | pi->num_progs = 0; | |
2326 | pi->progs = NULL; | |
2327 | pi->next = NULL; | |
2328 | pi->followup = 0; /* invalid */ | |
e98f68be | 2329 | pi->r_mode = RES_NONE; |
fe8c2806 WD |
2330 | return pi; |
2331 | } | |
2332 | ||
2333 | static void initialize_context(struct p_context *ctx) | |
2334 | { | |
2335 | ctx->pipe=NULL; | |
2336 | #ifndef __U_BOOT__ | |
2337 | ctx->pending_redirect=NULL; | |
2338 | #endif | |
2339 | ctx->child=NULL; | |
2340 | ctx->list_head=new_pipe(); | |
2341 | ctx->pipe=ctx->list_head; | |
2342 | ctx->w=RES_NONE; | |
2343 | ctx->stack=NULL; | |
2344 | #ifdef __U_BOOT__ | |
2345 | ctx->old_flag=0; | |
2346 | #endif | |
2347 | done_command(ctx); /* creates the memory for working child */ | |
2348 | } | |
2349 | ||
2350 | /* normal return is 0 | |
2351 | * if a reserved word is found, and processed, return 1 | |
2352 | * should handle if, then, elif, else, fi, for, while, until, do, done. | |
2353 | * case, function, and select are obnoxious, save those for later. | |
2354 | */ | |
3e38691e WD |
2355 | struct reserved_combo { |
2356 | char *literal; | |
2357 | int code; | |
2358 | long flag; | |
2359 | }; | |
2360 | /* Mostly a list of accepted follow-up reserved words. | |
2361 | * FLAG_END means we are done with the sequence, and are ready | |
2362 | * to turn the compound list into a command. | |
2363 | * FLAG_START means the word must start a new compound list. | |
2364 | */ | |
2365 | static struct reserved_combo reserved_list[] = { | |
2366 | { "if", RES_IF, FLAG_THEN | FLAG_START }, | |
2367 | { "then", RES_THEN, FLAG_ELIF | FLAG_ELSE | FLAG_FI }, | |
2368 | { "elif", RES_ELIF, FLAG_THEN }, | |
2369 | { "else", RES_ELSE, FLAG_FI }, | |
2370 | { "fi", RES_FI, FLAG_END }, | |
2371 | { "for", RES_FOR, FLAG_IN | FLAG_START }, | |
2372 | { "while", RES_WHILE, FLAG_DO | FLAG_START }, | |
2373 | { "until", RES_UNTIL, FLAG_DO | FLAG_START }, | |
2374 | { "in", RES_IN, FLAG_DO }, | |
2375 | { "do", RES_DO, FLAG_DONE }, | |
2376 | { "done", RES_DONE, FLAG_END } | |
2377 | }; | |
2378 | #define NRES (sizeof(reserved_list)/sizeof(struct reserved_combo)) | |
2379 | ||
199adb60 | 2380 | static int reserved_word(o_string *dest, struct p_context *ctx) |
fe8c2806 | 2381 | { |
fe8c2806 WD |
2382 | struct reserved_combo *r; |
2383 | for (r=reserved_list; | |
fe8c2806 WD |
2384 | r<reserved_list+NRES; r++) { |
2385 | if (strcmp(dest->data, r->literal) == 0) { | |
2386 | debug_printf("found reserved word %s, code %d\n",r->literal,r->code); | |
2387 | if (r->flag & FLAG_START) { | |
2388 | struct p_context *new = xmalloc(sizeof(struct p_context)); | |
2389 | debug_printf("push stack\n"); | |
2390 | if (ctx->w == RES_IN || ctx->w == RES_FOR) { | |
2391 | syntax(); | |
2392 | free(new); | |
2393 | ctx->w = RES_SNTX; | |
2394 | b_reset(dest); | |
2395 | return 1; | |
2396 | } | |
2397 | *new = *ctx; /* physical copy */ | |
2398 | initialize_context(ctx); | |
2399 | ctx->stack=new; | |
2400 | } else if ( ctx->w == RES_NONE || ! (ctx->old_flag & (1<<r->code))) { | |
2401 | syntax(); | |
2402 | ctx->w = RES_SNTX; | |
2403 | b_reset(dest); | |
2404 | return 1; | |
2405 | } | |
2406 | ctx->w=r->code; | |
2407 | ctx->old_flag = r->flag; | |
2408 | if (ctx->old_flag & FLAG_END) { | |
2409 | struct p_context *old; | |
2410 | debug_printf("pop stack\n"); | |
2411 | done_pipe(ctx,PIPE_SEQ); | |
2412 | old = ctx->stack; | |
2413 | old->child->group = ctx->list_head; | |
2414 | #ifndef __U_BOOT__ | |
2415 | old->child->subshell = 0; | |
2416 | #endif | |
2417 | *ctx = *old; /* physical copy */ | |
2418 | free(old); | |
2419 | } | |
2420 | b_reset (dest); | |
2421 | return 1; | |
2422 | } | |
2423 | } | |
2424 | return 0; | |
2425 | } | |
2426 | ||
2427 | /* normal return is 0. | |
2428 | * Syntax or xglob errors return 1. */ | |
2429 | static int done_word(o_string *dest, struct p_context *ctx) | |
2430 | { | |
2431 | struct child_prog *child=ctx->child; | |
2432 | #ifndef __U_BOOT__ | |
2433 | glob_t *glob_target; | |
2434 | int gr, flags = 0; | |
2435 | #else | |
2436 | char *str, *s; | |
2437 | int argc, cnt; | |
2438 | #endif | |
2439 | ||
2440 | debug_printf("done_word: %s %p\n", dest->data, child); | |
2441 | if (dest->length == 0 && !dest->nonnull) { | |
2442 | debug_printf(" true null, ignored\n"); | |
2443 | return 0; | |
2444 | } | |
2445 | #ifndef __U_BOOT__ | |
2446 | if (ctx->pending_redirect) { | |
2447 | glob_target = &ctx->pending_redirect->word; | |
2448 | } else { | |
2449 | #endif | |
2450 | if (child->group) { | |
2451 | syntax(); | |
2452 | return 1; /* syntax error, groups and arglists don't mix */ | |
2453 | } | |
2454 | if (!child->argv && (ctx->type & FLAG_PARSE_SEMICOLON)) { | |
2455 | debug_printf("checking %s for reserved-ness\n",dest->data); | |
2456 | if (reserved_word(dest,ctx)) return ctx->w==RES_SNTX; | |
2457 | } | |
2458 | #ifndef __U_BOOT__ | |
2459 | glob_target = &child->glob_result; | |
8bde7f77 | 2460 | if (child->argv) flags |= GLOB_APPEND; |
fe8c2806 WD |
2461 | #else |
2462 | for (cnt = 1, s = dest->data; s && *s; s++) { | |
2463 | if (*s == '\\') s++; | |
2464 | cnt++; | |
2465 | } | |
2466 | str = malloc(cnt); | |
2467 | if (!str) return 1; | |
2468 | if ( child->argv == NULL) { | |
2469 | child->argc=0; | |
2470 | } | |
2471 | argc = ++child->argc; | |
2472 | child->argv = realloc(child->argv, (argc+1)*sizeof(*child->argv)); | |
2473 | if (child->argv == NULL) return 1; | |
fe9ca3d3 SW |
2474 | child->argv_nonnull = realloc(child->argv_nonnull, |
2475 | (argc+1)*sizeof(*child->argv_nonnull)); | |
2476 | if (child->argv_nonnull == NULL) | |
2477 | return 1; | |
fe8c2806 | 2478 | child->argv[argc-1]=str; |
fe9ca3d3 | 2479 | child->argv_nonnull[argc-1] = dest->nonnull; |
fe8c2806 | 2480 | child->argv[argc]=NULL; |
fe9ca3d3 | 2481 | child->argv_nonnull[argc] = 0; |
fe8c2806 WD |
2482 | for (s = dest->data; s && *s; s++,str++) { |
2483 | if (*s == '\\') s++; | |
2484 | *str = *s; | |
2485 | } | |
2486 | *str = '\0'; | |
2487 | #endif | |
2488 | #ifndef __U_BOOT__ | |
2489 | } | |
2490 | gr = xglob(dest, flags, glob_target); | |
2491 | if (gr != 0) return 1; | |
2492 | #endif | |
2493 | ||
2494 | b_reset(dest); | |
2495 | #ifndef __U_BOOT__ | |
2496 | if (ctx->pending_redirect) { | |
2497 | ctx->pending_redirect=NULL; | |
2498 | if (glob_target->gl_pathc != 1) { | |
2499 | error_msg("ambiguous redirect"); | |
2500 | return 1; | |
2501 | } | |
2502 | } else { | |
2503 | child->argv = glob_target->gl_pathv; | |
2504 | } | |
2505 | #endif | |
2506 | if (ctx->w == RES_FOR) { | |
2507 | done_word(dest,ctx); | |
2508 | done_pipe(ctx,PIPE_SEQ); | |
2509 | } | |
2510 | return 0; | |
2511 | } | |
2512 | ||
2513 | /* The only possible error here is out of memory, in which case | |
2514 | * xmalloc exits. */ | |
2515 | static int done_command(struct p_context *ctx) | |
2516 | { | |
2517 | /* The child is really already in the pipe structure, so | |
2518 | * advance the pipe counter and make a new, null child. | |
2519 | * Only real trickiness here is that the uncommitted | |
2520 | * child structure, to which ctx->child points, is not | |
2521 | * counted in pi->num_progs. */ | |
2522 | struct pipe *pi=ctx->pipe; | |
2523 | struct child_prog *prog=ctx->child; | |
2524 | ||
2525 | if (prog && prog->group == NULL | |
8bde7f77 | 2526 | && prog->argv == NULL |
fe8c2806 | 2527 | #ifndef __U_BOOT__ |
8bde7f77 | 2528 | && prog->redirects == NULL) { |
fe8c2806 WD |
2529 | #else |
2530 | ) { | |
2531 | #endif | |
2532 | debug_printf("done_command: skipping null command\n"); | |
2533 | return 0; | |
2534 | } else if (prog) { | |
2535 | pi->num_progs++; | |
2536 | debug_printf("done_command: num_progs incremented to %d\n",pi->num_progs); | |
2537 | } else { | |
2538 | debug_printf("done_command: initializing\n"); | |
2539 | } | |
2540 | pi->progs = xrealloc(pi->progs, sizeof(*pi->progs) * (pi->num_progs+1)); | |
2541 | ||
2542 | prog = pi->progs + pi->num_progs; | |
2543 | #ifndef __U_BOOT__ | |
2544 | prog->redirects = NULL; | |
2545 | #endif | |
2546 | prog->argv = NULL; | |
fe9ca3d3 | 2547 | prog->argv_nonnull = NULL; |
fe8c2806 WD |
2548 | #ifndef __U_BOOT__ |
2549 | prog->is_stopped = 0; | |
2550 | #endif | |
2551 | prog->group = NULL; | |
2552 | #ifndef __U_BOOT__ | |
2553 | prog->glob_result.gl_pathv = NULL; | |
2554 | prog->family = pi; | |
2555 | #endif | |
2556 | prog->sp = 0; | |
2557 | ctx->child = prog; | |
2558 | prog->type = ctx->type; | |
2559 | ||
2560 | /* but ctx->pipe and ctx->list_head remain unchanged */ | |
2561 | return 0; | |
2562 | } | |
2563 | ||
2564 | static int done_pipe(struct p_context *ctx, pipe_style type) | |
2565 | { | |
2566 | struct pipe *new_p; | |
2567 | done_command(ctx); /* implicit closure of previous command */ | |
2568 | debug_printf("done_pipe, type %d\n", type); | |
2569 | ctx->pipe->followup = type; | |
2570 | ctx->pipe->r_mode = ctx->w; | |
2571 | new_p=new_pipe(); | |
2572 | ctx->pipe->next = new_p; | |
2573 | ctx->pipe = new_p; | |
2574 | ctx->child = NULL; | |
2575 | done_command(ctx); /* set up new pipe to accept commands */ | |
2576 | return 0; | |
2577 | } | |
2578 | ||
2579 | #ifndef __U_BOOT__ | |
2580 | /* peek ahead in the in_str to find out if we have a "&n" construct, | |
2581 | * as in "2>&1", that represents duplicating a file descriptor. | |
2582 | * returns either -2 (syntax error), -1 (no &), or the number found. | |
2583 | */ | |
2584 | static int redirect_dup_num(struct in_str *input) | |
2585 | { | |
2586 | int ch, d=0, ok=0; | |
2587 | ch = b_peek(input); | |
2588 | if (ch != '&') return -1; | |
2589 | ||
2590 | b_getch(input); /* get the & */ | |
2591 | ch=b_peek(input); | |
2592 | if (ch == '-') { | |
2593 | b_getch(input); | |
2594 | return -3; /* "-" represents "close me" */ | |
2595 | } | |
2596 | while (isdigit(ch)) { | |
2597 | d = d*10+(ch-'0'); | |
2598 | ok=1; | |
2599 | b_getch(input); | |
2600 | ch = b_peek(input); | |
2601 | } | |
2602 | if (ok) return d; | |
2603 | ||
2604 | error_msg("ambiguous redirect"); | |
2605 | return -2; | |
2606 | } | |
2607 | ||
2608 | /* If a redirect is immediately preceded by a number, that number is | |
2609 | * supposed to tell which file descriptor to redirect. This routine | |
2610 | * looks for such preceding numbers. In an ideal world this routine | |
2611 | * needs to handle all the following classes of redirects... | |
2612 | * echo 2>foo # redirects fd 2 to file "foo", nothing passed to echo | |
2613 | * echo 49>foo # redirects fd 49 to file "foo", nothing passed to echo | |
2614 | * echo -2>foo # redirects fd 1 to file "foo", "-2" passed to echo | |
2615 | * echo 49x>foo # redirects fd 1 to file "foo", "49x" passed to echo | |
2616 | * A -1 output from this program means no valid number was found, so the | |
2617 | * caller should use the appropriate default for this redirection. | |
2618 | */ | |
2619 | static int redirect_opt_num(o_string *o) | |
2620 | { | |
2621 | int num; | |
2622 | ||
2623 | if (o->length==0) return -1; | |
2624 | for(num=0; num<o->length; num++) { | |
2625 | if (!isdigit(*(o->data+num))) { | |
2626 | return -1; | |
2627 | } | |
2628 | } | |
2629 | /* reuse num (and save an int) */ | |
2630 | num=atoi(o->data); | |
2631 | b_reset(o); | |
2632 | return num; | |
2633 | } | |
2634 | ||
2635 | FILE *generate_stream_from_list(struct pipe *head) | |
2636 | { | |
2637 | FILE *pf; | |
2638 | #if 1 | |
2639 | int pid, channel[2]; | |
2640 | if (pipe(channel)<0) perror_msg_and_die("pipe"); | |
2641 | pid=fork(); | |
2642 | if (pid<0) { | |
2643 | perror_msg_and_die("fork"); | |
2644 | } else if (pid==0) { | |
2645 | close(channel[0]); | |
2646 | if (channel[1] != 1) { | |
2647 | dup2(channel[1],1); | |
2648 | close(channel[1]); | |
2649 | } | |
2650 | #if 0 | |
2651 | #define SURROGATE "surrogate response" | |
2652 | write(1,SURROGATE,sizeof(SURROGATE)); | |
2653 | _exit(run_list(head)); | |
2654 | #else | |
2655 | _exit(run_list_real(head)); /* leaks memory */ | |
2656 | #endif | |
2657 | } | |
2658 | debug_printf("forked child %d\n",pid); | |
2659 | close(channel[1]); | |
2660 | pf = fdopen(channel[0],"r"); | |
2661 | debug_printf("pipe on FILE *%p\n",pf); | |
2662 | #else | |
2663 | free_pipe_list(head,0); | |
2664 | pf=popen("echo surrogate response","r"); | |
2665 | debug_printf("started fake pipe on FILE *%p\n",pf); | |
2666 | #endif | |
2667 | return pf; | |
2668 | } | |
2669 | ||
2670 | /* this version hacked for testing purposes */ | |
2671 | /* return code is exit status of the process that is run. */ | |
2672 | static int process_command_subs(o_string *dest, struct p_context *ctx, struct in_str *input, int subst_end) | |
2673 | { | |
2674 | int retcode; | |
2675 | o_string result=NULL_O_STRING; | |
2676 | struct p_context inner; | |
2677 | FILE *p; | |
2678 | struct in_str pipe_str; | |
2679 | initialize_context(&inner); | |
2680 | ||
2681 | /* recursion to generate command */ | |
2682 | retcode = parse_stream(&result, &inner, input, subst_end); | |
2683 | if (retcode != 0) return retcode; /* syntax error or EOF */ | |
2684 | done_word(&result, &inner); | |
2685 | done_pipe(&inner, PIPE_SEQ); | |
2686 | b_free(&result); | |
2687 | ||
2688 | p=generate_stream_from_list(inner.list_head); | |
2689 | if (p==NULL) return 1; | |
2690 | mark_open(fileno(p)); | |
2691 | setup_file_in_str(&pipe_str, p); | |
2692 | ||
2693 | /* now send results of command back into original context */ | |
2694 | retcode = parse_stream(dest, ctx, &pipe_str, '\0'); | |
2695 | /* XXX In case of a syntax error, should we try to kill the child? | |
2696 | * That would be tough to do right, so just read until EOF. */ | |
2697 | if (retcode == 1) { | |
2698 | while (b_getch(&pipe_str)!=EOF) { /* discard */ }; | |
2699 | } | |
2700 | ||
2701 | debug_printf("done reading from pipe, pclose()ing\n"); | |
2702 | /* This is the step that wait()s for the child. Should be pretty | |
2703 | * safe, since we just read an EOF from its stdout. We could try | |
2704 | * to better, by using wait(), and keeping track of background jobs | |
2705 | * at the same time. That would be a lot of work, and contrary | |
2706 | * to the KISS philosophy of this program. */ | |
2707 | mark_closed(fileno(p)); | |
2708 | retcode=pclose(p); | |
2709 | free_pipe_list(inner.list_head,0); | |
2710 | debug_printf("pclosed, retcode=%d\n",retcode); | |
2711 | /* XXX this process fails to trim a single trailing newline */ | |
2712 | return retcode; | |
2713 | } | |
2714 | ||
2715 | static int parse_group(o_string *dest, struct p_context *ctx, | |
2716 | struct in_str *input, int ch) | |
2717 | { | |
2718 | int rcode, endch=0; | |
2719 | struct p_context sub; | |
2720 | struct child_prog *child = ctx->child; | |
2721 | if (child->argv) { | |
2722 | syntax(); | |
2723 | return 1; /* syntax error, groups and arglists don't mix */ | |
2724 | } | |
2725 | initialize_context(&sub); | |
2726 | switch(ch) { | |
2727 | case '(': endch=')'; child->subshell=1; break; | |
2728 | case '{': endch='}'; break; | |
2729 | default: syntax(); /* really logic error */ | |
2730 | } | |
2731 | rcode=parse_stream(dest,&sub,input,endch); | |
2732 | done_word(dest,&sub); /* finish off the final word in the subcontext */ | |
2733 | done_pipe(&sub, PIPE_SEQ); /* and the final command there, too */ | |
2734 | child->group = sub.list_head; | |
2735 | return rcode; | |
2736 | /* child remains "open", available for possible redirects */ | |
2737 | } | |
2738 | #endif | |
2739 | ||
2740 | /* basically useful version until someone wants to get fancier, | |
2741 | * see the bash man page under "Parameter Expansion" */ | |
2742 | static char *lookup_param(char *src) | |
2743 | { | |
c26e454d | 2744 | char *p; |
641b0d37 JH |
2745 | char *sep; |
2746 | char *default_val = NULL; | |
2747 | int assign = 0; | |
2748 | int expand_empty = 0; | |
c26e454d WD |
2749 | |
2750 | if (!src) | |
2751 | return NULL; | |
2752 | ||
641b0d37 JH |
2753 | sep = strchr(src, ':'); |
2754 | ||
2755 | if (sep) { | |
2756 | *sep = '\0'; | |
2757 | if (*(sep + 1) == '-') | |
2758 | default_val = sep+2; | |
2759 | if (*(sep + 1) == '=') { | |
2760 | default_val = sep+2; | |
2761 | assign = 1; | |
2762 | } | |
2763 | if (*(sep + 1) == '+') { | |
2764 | default_val = sep+2; | |
2765 | expand_empty = 1; | |
2766 | } | |
2767 | } | |
2768 | ||
2769 | p = getenv(src); | |
2770 | if (!p) | |
2771 | p = get_local_var(src); | |
2772 | ||
2773 | if (!p || strlen(p) == 0) { | |
2774 | p = default_val; | |
2775 | if (assign) { | |
2776 | char *var = malloc(strlen(src)+strlen(default_val)+2); | |
2777 | if (var) { | |
2778 | sprintf(var, "%s=%s", src, default_val); | |
2779 | set_local_var(var, 0); | |
2780 | } | |
2781 | free(var); | |
2782 | } | |
2783 | } else if (expand_empty) { | |
2784 | p += strlen(p); | |
2785 | } | |
2786 | ||
2787 | if (sep) | |
2788 | *sep = ':'; | |
c26e454d | 2789 | |
fe8c2806 WD |
2790 | return p; |
2791 | } | |
2792 | ||
c26e454d WD |
2793 | #ifdef __U_BOOT__ |
2794 | static char *get_dollar_var(char ch) | |
2795 | { | |
2796 | static char buf[40]; | |
2797 | ||
2798 | buf[0] = '\0'; | |
2799 | switch (ch) { | |
2800 | case '?': | |
2801 | sprintf(buf, "%u", (unsigned int)last_return_code); | |
2802 | break; | |
2803 | default: | |
2804 | return NULL; | |
2805 | } | |
2806 | return buf; | |
2807 | } | |
2808 | #endif | |
2809 | ||
fe8c2806 WD |
2810 | /* return code: 0 for OK, 1 for syntax error */ |
2811 | static int handle_dollar(o_string *dest, struct p_context *ctx, struct in_str *input) | |
2812 | { | |
2813 | #ifndef __U_BOOT__ | |
2814 | int i, advance=0; | |
2815 | #else | |
2816 | int advance=0; | |
2817 | #endif | |
2818 | #ifndef __U_BOOT__ | |
2819 | char sep[]=" "; | |
2820 | #endif | |
2821 | int ch = input->peek(input); /* first character after the $ */ | |
2822 | debug_printf("handle_dollar: ch=%c\n",ch); | |
2823 | if (isalpha(ch)) { | |
2824 | b_addchr(dest, SPECIAL_VAR_SYMBOL); | |
2825 | ctx->child->sp++; | |
2826 | while(ch=b_peek(input),isalnum(ch) || ch=='_') { | |
2827 | b_getch(input); | |
2828 | b_addchr(dest,ch); | |
2829 | } | |
2830 | b_addchr(dest, SPECIAL_VAR_SYMBOL); | |
2831 | #ifndef __U_BOOT__ | |
2832 | } else if (isdigit(ch)) { | |
2833 | i = ch-'0'; /* XXX is $0 special? */ | |
2834 | if (i<global_argc) { | |
2835 | parse_string(dest, ctx, global_argv[i]); /* recursion */ | |
2836 | } | |
2837 | advance = 1; | |
2838 | #endif | |
2839 | } else switch (ch) { | |
2840 | #ifndef __U_BOOT__ | |
2841 | case '$': | |
2842 | b_adduint(dest,getpid()); | |
2843 | advance = 1; | |
2844 | break; | |
2845 | case '!': | |
2846 | if (last_bg_pid > 0) b_adduint(dest, last_bg_pid); | |
2847 | advance = 1; | |
2848 | break; | |
2849 | #endif | |
2850 | case '?': | |
c26e454d | 2851 | #ifndef __U_BOOT__ |
fe8c2806 | 2852 | b_adduint(dest,last_return_code); |
c26e454d WD |
2853 | #else |
2854 | ctx->child->sp++; | |
2855 | b_addchr(dest, SPECIAL_VAR_SYMBOL); | |
2856 | b_addchr(dest, '$'); | |
2857 | b_addchr(dest, '?'); | |
2858 | b_addchr(dest, SPECIAL_VAR_SYMBOL); | |
2859 | #endif | |
fe8c2806 WD |
2860 | advance = 1; |
2861 | break; | |
2862 | #ifndef __U_BOOT__ | |
2863 | case '#': | |
2864 | b_adduint(dest,global_argc ? global_argc-1 : 0); | |
2865 | advance = 1; | |
2866 | break; | |
2867 | #endif | |
2868 | case '{': | |
2869 | b_addchr(dest, SPECIAL_VAR_SYMBOL); | |
2870 | ctx->child->sp++; | |
2871 | b_getch(input); | |
2872 | /* XXX maybe someone will try to escape the '}' */ | |
2873 | while(ch=b_getch(input),ch!=EOF && ch!='}') { | |
2874 | b_addchr(dest,ch); | |
2875 | } | |
2876 | if (ch != '}') { | |
2877 | syntax(); | |
2878 | return 1; | |
2879 | } | |
2880 | b_addchr(dest, SPECIAL_VAR_SYMBOL); | |
2881 | break; | |
2882 | #ifndef __U_BOOT__ | |
2883 | case '(': | |
2884 | b_getch(input); | |
2885 | process_command_subs(dest, ctx, input, ')'); | |
2886 | break; | |
2887 | case '*': | |
2888 | sep[0]=ifs[0]; | |
2889 | for (i=1; i<global_argc; i++) { | |
2890 | parse_string(dest, ctx, global_argv[i]); | |
2891 | if (i+1 < global_argc) parse_string(dest, ctx, sep); | |
2892 | } | |
2893 | break; | |
2894 | case '@': | |
2895 | case '-': | |
2896 | case '_': | |
2897 | /* still unhandled, but should be eventually */ | |
2898 | error_msg("unhandled syntax: $%c",ch); | |
2899 | return 1; | |
2900 | break; | |
2901 | #endif | |
2902 | default: | |
2903 | b_addqchr(dest,'$',dest->quote); | |
2904 | } | |
2905 | /* Eat the character if the flag was set. If the compiler | |
2906 | * is smart enough, we could substitute "b_getch(input);" | |
2907 | * for all the "advance = 1;" above, and also end up with | |
2908 | * a nice size-optimized program. Hah! That'll be the day. | |
2909 | */ | |
2910 | if (advance) b_getch(input); | |
2911 | return 0; | |
2912 | } | |
2913 | ||
2914 | #ifndef __U_BOOT__ | |
2915 | int parse_string(o_string *dest, struct p_context *ctx, const char *src) | |
2916 | { | |
2917 | struct in_str foo; | |
2918 | setup_string_in_str(&foo, src); | |
2919 | return parse_stream(dest, ctx, &foo, '\0'); | |
2920 | } | |
2921 | #endif | |
2922 | ||
2923 | /* return code is 0 for normal exit, 1 for syntax error */ | |
199adb60 KP |
2924 | static int parse_stream(o_string *dest, struct p_context *ctx, |
2925 | struct in_str *input, int end_trigger) | |
fe8c2806 WD |
2926 | { |
2927 | unsigned int ch, m; | |
2928 | #ifndef __U_BOOT__ | |
2929 | int redir_fd; | |
2930 | redir_type redir_style; | |
2931 | #endif | |
2932 | int next; | |
2933 | ||
2934 | /* Only double-quote state is handled in the state variable dest->quote. | |
2935 | * A single-quote triggers a bypass of the main loop until its mate is | |
2936 | * found. When recursing, quote state is passed in via dest->quote. */ | |
2937 | ||
2938 | debug_printf("parse_stream, end_trigger=%d\n",end_trigger); | |
2939 | while ((ch=b_getch(input))!=EOF) { | |
2940 | m = map[ch]; | |
2941 | #ifdef __U_BOOT__ | |
2942 | if (input->__promptme == 0) return 1; | |
2943 | #endif | |
2944 | next = (ch == '\n') ? 0 : b_peek(input); | |
c26e454d WD |
2945 | |
2946 | debug_printf("parse_stream: ch=%c (%d) m=%d quote=%d - %c\n", | |
2947 | ch >= ' ' ? ch : '.', ch, m, | |
2948 | dest->quote, ctx->stack == NULL ? '*' : '.'); | |
2949 | ||
fe8c2806 WD |
2950 | if (m==0 || ((m==1 || m==2) && dest->quote)) { |
2951 | b_addqchr(dest, ch, dest->quote); | |
2952 | } else { | |
2953 | if (m==2) { /* unquoted IFS */ | |
2954 | if (done_word(dest, ctx)) { | |
2955 | return 1; | |
2956 | } | |
2957 | /* If we aren't performing a substitution, treat a newline as a | |
2958 | * command separator. */ | |
2959 | if (end_trigger != '\0' && ch=='\n') | |
2960 | done_pipe(ctx,PIPE_SEQ); | |
2961 | } | |
2962 | if (ch == end_trigger && !dest->quote && ctx->w==RES_NONE) { | |
2963 | debug_printf("leaving parse_stream (triggered)\n"); | |
2964 | return 0; | |
2965 | } | |
2966 | #if 0 | |
2967 | if (ch=='\n') { | |
2968 | /* Yahoo! Time to run with it! */ | |
2969 | done_pipe(ctx,PIPE_SEQ); | |
2970 | run_list(ctx->list_head); | |
2971 | initialize_context(ctx); | |
2972 | } | |
2973 | #endif | |
2974 | if (m!=2) switch (ch) { | |
2975 | case '#': | |
2976 | if (dest->length == 0 && !dest->quote) { | |
2977 | while(ch=b_peek(input),ch!=EOF && ch!='\n') { b_getch(input); } | |
2978 | } else { | |
2979 | b_addqchr(dest, ch, dest->quote); | |
2980 | } | |
2981 | break; | |
2982 | case '\\': | |
2983 | if (next == EOF) { | |
2984 | syntax(); | |
2985 | return 1; | |
2986 | } | |
2987 | b_addqchr(dest, '\\', dest->quote); | |
2988 | b_addqchr(dest, b_getch(input), dest->quote); | |
2989 | break; | |
2990 | case '$': | |
2991 | if (handle_dollar(dest, ctx, input)!=0) return 1; | |
2992 | break; | |
2993 | case '\'': | |
2994 | dest->nonnull = 1; | |
2995 | while(ch=b_getch(input),ch!=EOF && ch!='\'') { | |
2996 | #ifdef __U_BOOT__ | |
2997 | if(input->__promptme == 0) return 1; | |
2998 | #endif | |
2999 | b_addchr(dest,ch); | |
3000 | } | |
3001 | if (ch==EOF) { | |
3002 | syntax(); | |
3003 | return 1; | |
3004 | } | |
3005 | break; | |
3006 | case '"': | |
3007 | dest->nonnull = 1; | |
3008 | dest->quote = !dest->quote; | |
3009 | break; | |
3010 | #ifndef __U_BOOT__ | |
3011 | case '`': | |
3012 | process_command_subs(dest, ctx, input, '`'); | |
3013 | break; | |
3014 | case '>': | |
3015 | redir_fd = redirect_opt_num(dest); | |
3016 | done_word(dest, ctx); | |
3017 | redir_style=REDIRECT_OVERWRITE; | |
3018 | if (next == '>') { | |
3019 | redir_style=REDIRECT_APPEND; | |
3020 | b_getch(input); | |
3021 | } else if (next == '(') { | |
3022 | syntax(); /* until we support >(list) Process Substitution */ | |
3023 | return 1; | |
3024 | } | |
3025 | setup_redirect(ctx, redir_fd, redir_style, input); | |
3026 | break; | |
3027 | case '<': | |
3028 | redir_fd = redirect_opt_num(dest); | |
3029 | done_word(dest, ctx); | |
3030 | redir_style=REDIRECT_INPUT; | |
3031 | if (next == '<') { | |
3032 | redir_style=REDIRECT_HEREIS; | |
3033 | b_getch(input); | |
3034 | } else if (next == '>') { | |
3035 | redir_style=REDIRECT_IO; | |
3036 | b_getch(input); | |
3037 | } else if (next == '(') { | |
3038 | syntax(); /* until we support <(list) Process Substitution */ | |
3039 | return 1; | |
3040 | } | |
3041 | setup_redirect(ctx, redir_fd, redir_style, input); | |
3042 | break; | |
3043 | #endif | |
3044 | case ';': | |
3045 | done_word(dest, ctx); | |
3046 | done_pipe(ctx,PIPE_SEQ); | |
3047 | break; | |
3048 | case '&': | |
3049 | done_word(dest, ctx); | |
3050 | if (next=='&') { | |
3051 | b_getch(input); | |
3052 | done_pipe(ctx,PIPE_AND); | |
3053 | } else { | |
3054 | #ifndef __U_BOOT__ | |
3055 | done_pipe(ctx,PIPE_BG); | |
3056 | #else | |
3057 | syntax_err(); | |
3058 | return 1; | |
3059 | #endif | |
3060 | } | |
3061 | break; | |
3062 | case '|': | |
3063 | done_word(dest, ctx); | |
3064 | if (next=='|') { | |
3065 | b_getch(input); | |
3066 | done_pipe(ctx,PIPE_OR); | |
3067 | } else { | |
3068 | /* we could pick up a file descriptor choice here | |
3069 | * with redirect_opt_num(), but bash doesn't do it. | |
3070 | * "echo foo 2| cat" yields "foo 2". */ | |
3071 | #ifndef __U_BOOT__ | |
3072 | done_command(ctx); | |
3073 | #else | |
3074 | syntax_err(); | |
3075 | return 1; | |
3076 | #endif | |
3077 | } | |
3078 | break; | |
3079 | #ifndef __U_BOOT__ | |
3080 | case '(': | |
3081 | case '{': | |
3082 | if (parse_group(dest, ctx, input, ch)!=0) return 1; | |
3083 | break; | |
3084 | case ')': | |
3085 | case '}': | |
3086 | syntax(); /* Proper use of this character caught by end_trigger */ | |
3087 | return 1; | |
3088 | break; | |
3089 | #endif | |
a005f19e JH |
3090 | case SUBSTED_VAR_SYMBOL: |
3091 | dest->nonnull = 1; | |
3092 | while (ch = b_getch(input), ch != EOF && | |
3093 | ch != SUBSTED_VAR_SYMBOL) { | |
3094 | debug_printf("subst, pass=%d\n", ch); | |
3095 | if (input->__promptme == 0) | |
3096 | return 1; | |
3097 | b_addchr(dest, ch); | |
3098 | } | |
3099 | debug_printf("subst, term=%d\n", ch); | |
3100 | if (ch == EOF) { | |
3101 | syntax(); | |
3102 | return 1; | |
3103 | } | |
3104 | break; | |
fe8c2806 WD |
3105 | default: |
3106 | syntax(); /* this is really an internal logic error */ | |
3107 | return 1; | |
3108 | } | |
3109 | } | |
3110 | } | |
3111 | /* complain if quote? No, maybe we just finished a command substitution | |
3112 | * that was quoted. Example: | |
3113 | * $ echo "`cat foo` plus more" | |
3114 | * and we just got the EOF generated by the subshell that ran "cat foo" | |
3115 | * The only real complaint is if we got an EOF when end_trigger != '\0', | |
3116 | * that is, we were really supposed to get end_trigger, and never got | |
3117 | * one before the EOF. Can't use the standard "syntax error" return code, | |
3118 | * so that parse_stream_outer can distinguish the EOF and exit smoothly. */ | |
3119 | debug_printf("leaving parse_stream (EOF)\n"); | |
3120 | if (end_trigger != '\0') return -1; | |
3121 | return 0; | |
3122 | } | |
3123 | ||
199adb60 | 3124 | static void mapset(const unsigned char *set, int code) |
fe8c2806 WD |
3125 | { |
3126 | const unsigned char *s; | |
3127 | for (s=set; *s; s++) map[*s] = code; | |
3128 | } | |
3129 | ||
199adb60 | 3130 | static void update_ifs_map(void) |
fe8c2806 WD |
3131 | { |
3132 | /* char *ifs and char map[256] are both globals. */ | |
77ddac94 WD |
3133 | ifs = (uchar *)getenv("IFS"); |
3134 | if (ifs == NULL) ifs=(uchar *)" \t\n"; | |
fe8c2806 WD |
3135 | /* Precompute a list of 'flow through' behavior so it can be treated |
3136 | * quickly up front. Computation is necessary because of IFS. | |
3137 | * Special case handling of IFS == " \t\n" is not implemented. | |
3138 | * The map[] array only really needs two bits each, and on most machines | |
3139 | * that would be faster because of the reduced L1 cache footprint. | |
3140 | */ | |
3141 | memset(map,0,sizeof(map)); /* most characters flow through always */ | |
3142 | #ifndef __U_BOOT__ | |
77ddac94 WD |
3143 | mapset((uchar *)"\\$'\"`", 3); /* never flow through */ |
3144 | mapset((uchar *)"<>;&|(){}#", 1); /* flow through if quoted */ | |
fe8c2806 | 3145 | #else |
a005f19e JH |
3146 | { |
3147 | uchar subst[2] = {SUBSTED_VAR_SYMBOL, 0}; | |
3148 | mapset(subst, 3); /* never flow through */ | |
3149 | } | |
77ddac94 WD |
3150 | mapset((uchar *)"\\$'\"", 3); /* never flow through */ |
3151 | mapset((uchar *)";&|#", 1); /* flow through if quoted */ | |
fe8c2806 WD |
3152 | #endif |
3153 | mapset(ifs, 2); /* also flow through if quoted */ | |
3154 | } | |
3155 | ||
3156 | /* most recursion does not come through here, the exeception is | |
3157 | * from builtin_source() */ | |
199adb60 | 3158 | static int parse_stream_outer(struct in_str *inp, int flag) |
fe8c2806 WD |
3159 | { |
3160 | ||
3161 | struct p_context ctx; | |
3162 | o_string temp=NULL_O_STRING; | |
3163 | int rcode; | |
3164 | #ifdef __U_BOOT__ | |
2302b3ab | 3165 | int code = 1; |
fe8c2806 WD |
3166 | #endif |
3167 | do { | |
3168 | ctx.type = flag; | |
3169 | initialize_context(&ctx); | |
3170 | update_ifs_map(); | |
77ddac94 | 3171 | if (!(flag & FLAG_PARSE_SEMICOLON) || (flag & FLAG_REPARSING)) mapset((uchar *)";$&|", 0); |
fe8c2806 | 3172 | inp->promptmode=1; |
87b6398b SG |
3173 | rcode = parse_stream(&temp, &ctx, inp, |
3174 | flag & FLAG_CONT_ON_NEWLINE ? -1 : '\n'); | |
fe8c2806 WD |
3175 | #ifdef __U_BOOT__ |
3176 | if (rcode == 1) flag_repeat = 0; | |
3177 | #endif | |
3178 | if (rcode != 1 && ctx.old_flag != 0) { | |
3179 | syntax(); | |
3180 | #ifdef __U_BOOT__ | |
3181 | flag_repeat = 0; | |
3182 | #endif | |
3183 | } | |
3184 | if (rcode != 1 && ctx.old_flag == 0) { | |
3185 | done_word(&temp, &ctx); | |
3186 | done_pipe(&ctx,PIPE_SEQ); | |
3187 | #ifndef __U_BOOT__ | |
3188 | run_list(ctx.list_head); | |
3189 | #else | |
c26e454d WD |
3190 | code = run_list(ctx.list_head); |
3191 | if (code == -2) { /* exit */ | |
3192 | b_free(&temp); | |
3193 | code = 0; | |
3194 | /* XXX hackish way to not allow exit from main loop */ | |
3195 | if (inp->peek == file_peek) { | |
3196 | printf("exit not allowed from main input shell.\n"); | |
3197 | continue; | |
3198 | } | |
3199 | break; | |
3200 | } | |
3201 | if (code == -1) | |
fe8c2806 WD |
3202 | flag_repeat = 0; |
3203 | #endif | |
3204 | } else { | |
3205 | if (ctx.old_flag != 0) { | |
3206 | free(ctx.stack); | |
3207 | b_reset(&temp); | |
3208 | } | |
3209 | #ifdef __U_BOOT__ | |
3210 | if (inp->__promptme == 0) printf("<INTERRUPT>\n"); | |
3211 | inp->__promptme = 1; | |
3212 | #endif | |
3213 | temp.nonnull = 0; | |
3214 | temp.quote = 0; | |
3215 | inp->p = NULL; | |
3216 | free_pipe_list(ctx.list_head,0); | |
3217 | } | |
3218 | b_free(&temp); | |
587e1d43 | 3219 | /* loop on syntax errors, return on EOF */ |
f3a05c8f | 3220 | } while (rcode != -1 && !(flag & FLAG_EXIT_FROM_LOOP) && |
587e1d43 | 3221 | (inp->peek != static_peek || b_peek(inp))); |
fe8c2806 WD |
3222 | #ifndef __U_BOOT__ |
3223 | return 0; | |
3224 | #else | |
3225 | return (code != 0) ? 1 : 0; | |
3226 | #endif /* __U_BOOT__ */ | |
3227 | } | |
3228 | ||
3229 | #ifndef __U_BOOT__ | |
3230 | static int parse_string_outer(const char *s, int flag) | |
3231 | #else | |
c8a2079e | 3232 | int parse_string_outer(const char *s, int flag) |
fe8c2806 WD |
3233 | #endif /* __U_BOOT__ */ |
3234 | { | |
3235 | struct in_str input; | |
3236 | #ifdef __U_BOOT__ | |
3237 | char *p = NULL; | |
3238 | int rcode; | |
484408fb | 3239 | if (!s) |
fe8c2806 | 3240 | return 1; |
484408fb RV |
3241 | if (!*s) |
3242 | return 0; | |
fe8c2806 WD |
3243 | if (!(p = strchr(s, '\n')) || *++p) { |
3244 | p = xmalloc(strlen(s) + 2); | |
3245 | strcpy(p, s); | |
3246 | strcat(p, "\n"); | |
3247 | setup_string_in_str(&input, p); | |
3248 | rcode = parse_stream_outer(&input, flag); | |
3249 | free(p); | |
3250 | return rcode; | |
3251 | } else { | |
3252 | #endif | |
3253 | setup_string_in_str(&input, s); | |
3254 | return parse_stream_outer(&input, flag); | |
3255 | #ifdef __U_BOOT__ | |
3256 | } | |
3257 | #endif | |
3258 | } | |
3259 | ||
3260 | #ifndef __U_BOOT__ | |
3261 | static int parse_file_outer(FILE *f) | |
3262 | #else | |
3263 | int parse_file_outer(void) | |
3264 | #endif | |
3265 | { | |
3266 | int rcode; | |
3267 | struct in_str input; | |
3268 | #ifndef __U_BOOT__ | |
3269 | setup_file_in_str(&input, f); | |
3270 | #else | |
3271 | setup_file_in_str(&input); | |
3272 | #endif | |
3273 | rcode = parse_stream_outer(&input, FLAG_PARSE_SEMICOLON); | |
3274 | return rcode; | |
3275 | } | |
3276 | ||
3277 | #ifdef __U_BOOT__ | |
2e5167cc | 3278 | #ifdef CONFIG_NEEDS_MANUAL_RELOC |
3e38691e WD |
3279 | static void u_boot_hush_reloc(void) |
3280 | { | |
3e38691e WD |
3281 | unsigned long addr; |
3282 | struct reserved_combo *r; | |
3283 | ||
3284 | for (r=reserved_list; r<reserved_list+NRES; r++) { | |
3285 | addr = (ulong) (r->literal) + gd->reloc_off; | |
3286 | r->literal = (char *)addr; | |
3287 | } | |
3288 | } | |
521af04d | 3289 | #endif |
3e38691e | 3290 | |
fe8c2806 WD |
3291 | int u_boot_hush_start(void) |
3292 | { | |
2d5b561e WD |
3293 | if (top_vars == NULL) { |
3294 | top_vars = malloc(sizeof(struct variables)); | |
3295 | top_vars->name = "HUSH_VERSION"; | |
3296 | top_vars->value = "0.01"; | |
199adb60 | 3297 | top_vars->next = NULL; |
2d5b561e WD |
3298 | top_vars->flg_export = 0; |
3299 | top_vars->flg_read_only = 1; | |
2e5167cc | 3300 | #ifdef CONFIG_NEEDS_MANUAL_RELOC |
2d5b561e | 3301 | u_boot_hush_reloc(); |
521af04d | 3302 | #endif |
2d5b561e | 3303 | } |
fe8c2806 WD |
3304 | return 0; |
3305 | } | |
3306 | ||
3307 | static void *xmalloc(size_t size) | |
3308 | { | |
3309 | void *p = NULL; | |
3310 | ||
3311 | if (!(p = malloc(size))) { | |
3312 | printf("ERROR : memory not allocated\n"); | |
3313 | for(;;); | |
3314 | } | |
3315 | return p; | |
3316 | } | |
3317 | ||
3318 | static void *xrealloc(void *ptr, size_t size) | |
3319 | { | |
3320 | void *p = NULL; | |
3321 | ||
3322 | if (!(p = realloc(ptr, size))) { | |
3323 | printf("ERROR : memory not allocated\n"); | |
3324 | for(;;); | |
3325 | } | |
3326 | return p; | |
3327 | } | |
3328 | #endif /* __U_BOOT__ */ | |
3329 | ||
3330 | #ifndef __U_BOOT__ | |
3331 | /* Make sure we have a controlling tty. If we get started under a job | |
3332 | * aware app (like bash for example), make sure we are now in charge so | |
3333 | * we don't fight over who gets the foreground */ | |
d0fb80c3 | 3334 | static void setup_job_control(void) |
fe8c2806 WD |
3335 | { |
3336 | static pid_t shell_pgrp; | |
3337 | /* Loop until we are in the foreground. */ | |
3338 | while (tcgetpgrp (shell_terminal) != (shell_pgrp = getpgrp ())) | |
3339 | kill (- shell_pgrp, SIGTTIN); | |
3340 | ||
3341 | /* Ignore interactive and job-control signals. */ | |
3342 | signal(SIGINT, SIG_IGN); | |
3343 | signal(SIGQUIT, SIG_IGN); | |
3344 | signal(SIGTERM, SIG_IGN); | |
3345 | signal(SIGTSTP, SIG_IGN); | |
3346 | signal(SIGTTIN, SIG_IGN); | |
3347 | signal(SIGTTOU, SIG_IGN); | |
3348 | signal(SIGCHLD, SIG_IGN); | |
3349 | ||
3350 | /* Put ourselves in our own process group. */ | |
3351 | setsid(); | |
3352 | shell_pgrp = getpid (); | |
3353 | setpgid (shell_pgrp, shell_pgrp); | |
3354 | ||
3355 | /* Grab control of the terminal. */ | |
3356 | tcsetpgrp(shell_terminal, shell_pgrp); | |
3357 | } | |
3358 | ||
54841ab5 | 3359 | int hush_main(int argc, char * const *argv) |
fe8c2806 WD |
3360 | { |
3361 | int opt; | |
3362 | FILE *input; | |
3363 | char **e = environ; | |
3364 | ||
3365 | /* XXX what should these be while sourcing /etc/profile? */ | |
3366 | global_argc = argc; | |
3367 | global_argv = argv; | |
3368 | ||
3369 | /* (re?) initialize globals. Sometimes hush_main() ends up calling | |
3370 | * hush_main(), therefore we cannot rely on the BSS to zero out this | |
3371 | * stuff. Reset these to 0 every time. */ | |
3372 | ifs = NULL; | |
3373 | /* map[] is taken care of with call to update_ifs_map() */ | |
3374 | fake_mode = 0; | |
3375 | interactive = 0; | |
3376 | close_me_head = NULL; | |
3377 | last_bg_pid = 0; | |
3378 | job_list = NULL; | |
3379 | last_jobid = 0; | |
3380 | ||
3381 | /* Initialize some more globals to non-zero values */ | |
3382 | set_cwd(); | |
d0fb80c3 | 3383 | #ifdef CONFIG_FEATURE_COMMAND_EDITING |
fe8c2806 WD |
3384 | cmdedit_set_initial_prompt(); |
3385 | #else | |
3386 | PS1 = NULL; | |
3387 | #endif | |
3388 | PS2 = "> "; | |
3389 | ||
3390 | /* initialize our shell local variables with the values | |
3391 | * currently living in the environment */ | |
3392 | if (e) { | |
3393 | for (; *e; e++) | |
3394 | set_local_var(*e, 2); /* without call putenv() */ | |
3395 | } | |
3396 | ||
3397 | last_return_code=EXIT_SUCCESS; | |
3398 | ||
3399 | ||
3400 | if (argv[0] && argv[0][0] == '-') { | |
3401 | debug_printf("\nsourcing /etc/profile\n"); | |
3402 | if ((input = fopen("/etc/profile", "r")) != NULL) { | |
3403 | mark_open(fileno(input)); | |
3404 | parse_file_outer(input); | |
3405 | mark_closed(fileno(input)); | |
3406 | fclose(input); | |
3407 | } | |
3408 | } | |
3409 | input=stdin; | |
3410 | ||
3411 | while ((opt = getopt(argc, argv, "c:xif")) > 0) { | |
3412 | switch (opt) { | |
3413 | case 'c': | |
3414 | { | |
3415 | global_argv = argv+optind; | |
3416 | global_argc = argc-optind; | |
3417 | opt = parse_string_outer(optarg, FLAG_PARSE_SEMICOLON); | |
3418 | goto final_return; | |
3419 | } | |
3420 | break; | |
3421 | case 'i': | |
3422 | interactive++; | |
3423 | break; | |
3424 | case 'f': | |
3425 | fake_mode++; | |
3426 | break; | |
3427 | default: | |
3428 | #ifndef BB_VER | |
3429 | fprintf(stderr, "Usage: sh [FILE]...\n" | |
3430 | " or: sh -c command [args]...\n\n"); | |
3431 | exit(EXIT_FAILURE); | |
3432 | #else | |
3433 | show_usage(); | |
3434 | #endif | |
3435 | } | |
3436 | } | |
3437 | /* A shell is interactive if the `-i' flag was given, or if all of | |
3438 | * the following conditions are met: | |
3439 | * no -c command | |
3440 | * no arguments remaining or the -s flag given | |
3441 | * standard input is a terminal | |
3442 | * standard output is a terminal | |
3443 | * Refer to Posix.2, the description of the `sh' utility. */ | |
3444 | if (argv[optind]==NULL && input==stdin && | |
3445 | isatty(fileno(stdin)) && isatty(fileno(stdout))) { | |
3446 | interactive++; | |
3447 | } | |
3448 | ||
3449 | debug_printf("\ninteractive=%d\n", interactive); | |
3450 | if (interactive) { | |
3451 | /* Looks like they want an interactive shell */ | |
8bde7f77 | 3452 | #ifndef CONFIG_FEATURE_SH_EXTRA_QUIET |
d0fb80c3 WD |
3453 | printf( "\n\n" BB_BANNER " hush - the humble shell v0.01 (testing)\n"); |
3454 | printf( "Enter 'help' for a list of built-in commands.\n\n"); | |
3455 | #endif | |
fe8c2806 WD |
3456 | setup_job_control(); |
3457 | } | |
3458 | ||
3459 | if (argv[optind]==NULL) { | |
3460 | opt=parse_file_outer(stdin); | |
3461 | goto final_return; | |
3462 | } | |
3463 | ||
3464 | debug_printf("\nrunning script '%s'\n", argv[optind]); | |
3465 | global_argv = argv+optind; | |
3466 | global_argc = argc-optind; | |
3467 | input = xfopen(argv[optind], "r"); | |
3468 | opt = parse_file_outer(input); | |
3469 | ||
d0fb80c3 | 3470 | #ifdef CONFIG_FEATURE_CLEAN_UP |
fe8c2806 WD |
3471 | fclose(input); |
3472 | if (cwd && cwd != unknown) | |
3473 | free((char*)cwd); | |
3474 | { | |
3475 | struct variables *cur, *tmp; | |
3476 | for(cur = top_vars; cur; cur = tmp) { | |
3477 | tmp = cur->next; | |
3478 | if (!cur->flg_read_only) { | |
3479 | free(cur->name); | |
3480 | free(cur->value); | |
3481 | free(cur); | |
3482 | } | |
3483 | } | |
3484 | } | |
3485 | #endif | |
3486 | ||
3487 | final_return: | |
3488 | return(opt?opt:last_return_code); | |
3489 | } | |
3490 | #endif | |
3491 | ||
3492 | static char *insert_var_value(char *inp) | |
a005f19e JH |
3493 | { |
3494 | return insert_var_value_sub(inp, 0); | |
3495 | } | |
3496 | ||
3497 | static char *insert_var_value_sub(char *inp, int tag_subst) | |
fe8c2806 WD |
3498 | { |
3499 | int res_str_len = 0; | |
3500 | int len; | |
3501 | int done = 0; | |
3502 | char *p, *p1, *res_str = NULL; | |
3503 | ||
3504 | while ((p = strchr(inp, SPECIAL_VAR_SYMBOL))) { | |
a005f19e | 3505 | /* check the beginning of the string for normal charachters */ |
fe8c2806 | 3506 | if (p != inp) { |
a005f19e | 3507 | /* copy any charachters to the result string */ |
fe8c2806 WD |
3508 | len = p - inp; |
3509 | res_str = xrealloc(res_str, (res_str_len + len)); | |
3510 | strncpy((res_str + res_str_len), inp, len); | |
3511 | res_str_len += len; | |
3512 | } | |
3513 | inp = ++p; | |
a005f19e | 3514 | /* find the ending marker */ |
fe8c2806 WD |
3515 | p = strchr(inp, SPECIAL_VAR_SYMBOL); |
3516 | *p = '\0'; | |
a005f19e | 3517 | /* look up the value to substitute */ |
fe8c2806 | 3518 | if ((p1 = lookup_param(inp))) { |
a005f19e JH |
3519 | if (tag_subst) |
3520 | len = res_str_len + strlen(p1) + 2; | |
3521 | else | |
3522 | len = res_str_len + strlen(p1); | |
fe8c2806 | 3523 | res_str = xrealloc(res_str, (1 + len)); |
a005f19e JH |
3524 | if (tag_subst) { |
3525 | /* | |
3526 | * copy the variable value to the result | |
3527 | * string | |
3528 | */ | |
3529 | strcpy((res_str + res_str_len + 1), p1); | |
3530 | ||
3531 | /* | |
3532 | * mark the replaced text to be accepted as | |
3533 | * is | |
3534 | */ | |
3535 | res_str[res_str_len] = SUBSTED_VAR_SYMBOL; | |
3536 | res_str[res_str_len + 1 + strlen(p1)] = | |
3537 | SUBSTED_VAR_SYMBOL; | |
3538 | } else | |
3539 | /* | |
3540 | * copy the variable value to the result | |
3541 | * string | |
3542 | */ | |
3543 | strcpy((res_str + res_str_len), p1); | |
3544 | ||
fe8c2806 WD |
3545 | res_str_len = len; |
3546 | } | |
3547 | *p = SPECIAL_VAR_SYMBOL; | |
3548 | inp = ++p; | |
3549 | done = 1; | |
3550 | } | |
3551 | if (done) { | |
3552 | res_str = xrealloc(res_str, (1 + res_str_len + strlen(inp))); | |
3553 | strcpy((res_str + res_str_len), inp); | |
3554 | while ((p = strchr(res_str, '\n'))) { | |
3555 | *p = ' '; | |
3556 | } | |
3557 | } | |
3558 | return (res_str == NULL) ? inp : res_str; | |
3559 | } | |
3560 | ||
3561 | static char **make_list_in(char **inp, char *name) | |
3562 | { | |
3563 | int len, i; | |
3564 | int name_len = strlen(name); | |
3565 | int n = 0; | |
3566 | char **list; | |
3567 | char *p1, *p2, *p3; | |
3568 | ||
3569 | /* create list of variable values */ | |
3570 | list = xmalloc(sizeof(*list)); | |
3571 | for (i = 0; inp[i]; i++) { | |
3572 | p3 = insert_var_value(inp[i]); | |
3573 | p1 = p3; | |
3574 | while (*p1) { | |
930e4254 | 3575 | if (*p1 == ' ') { |
fe8c2806 WD |
3576 | p1++; |
3577 | continue; | |
3578 | } | |
3579 | if ((p2 = strchr(p1, ' '))) { | |
3580 | len = p2 - p1; | |
3581 | } else { | |
3582 | len = strlen(p1); | |
3583 | p2 = p1 + len; | |
3584 | } | |
3585 | /* we use n + 2 in realloc for list,because we add | |
3586 | * new element and then we will add NULL element */ | |
3587 | list = xrealloc(list, sizeof(*list) * (n + 2)); | |
3588 | list[n] = xmalloc(2 + name_len + len); | |
3589 | strcpy(list[n], name); | |
3590 | strcat(list[n], "="); | |
3591 | strncat(list[n], p1, len); | |
3592 | list[n++][name_len + len + 1] = '\0'; | |
3593 | p1 = p2; | |
3594 | } | |
3595 | if (p3 != inp[i]) free(p3); | |
3596 | } | |
3597 | list[n] = NULL; | |
3598 | return list; | |
3599 | } | |
3600 | ||
fe9ca3d3 SW |
3601 | /* |
3602 | * Make new string for parser | |
3603 | * inp - array of argument strings to flatten | |
3604 | * nonnull - indicates argument was quoted when originally parsed | |
3605 | */ | |
3606 | static char *make_string(char **inp, int *nonnull) | |
fe8c2806 WD |
3607 | { |
3608 | char *p; | |
3609 | char *str = NULL; | |
3610 | int n; | |
3611 | int len = 2; | |
a005f19e JH |
3612 | char *noeval_str; |
3613 | int noeval = 0; | |
fe8c2806 | 3614 | |
a005f19e JH |
3615 | noeval_str = get_local_var("HUSH_NO_EVAL"); |
3616 | if (noeval_str != NULL && *noeval_str != '0' && *noeval_str != '\0') | |
3617 | noeval = 1; | |
fe8c2806 | 3618 | for (n = 0; inp[n]; n++) { |
a005f19e | 3619 | p = insert_var_value_sub(inp[n], noeval); |
fe9ca3d3 | 3620 | str = xrealloc(str, (len + strlen(p) + (2 * nonnull[n]))); |
fe8c2806 WD |
3621 | if (n) { |
3622 | strcat(str, " "); | |
3623 | } else { | |
3624 | *str = '\0'; | |
3625 | } | |
fe9ca3d3 SW |
3626 | if (nonnull[n]) |
3627 | strcat(str, "'"); | |
fe8c2806 | 3628 | strcat(str, p); |
fe9ca3d3 SW |
3629 | if (nonnull[n]) |
3630 | strcat(str, "'"); | |
fe8c2806 WD |
3631 | len = strlen(str) + 3; |
3632 | if (p != inp[n]) free(p); | |
3633 | } | |
3634 | len = strlen(str); | |
3635 | *(str + len) = '\n'; | |
3636 | *(str + len + 1) = '\0'; | |
3637 | return str; | |
3638 | } | |
3639 | ||
81473f67 | 3640 | #ifdef __U_BOOT__ |
199adb60 KP |
3641 | static int do_showvar(cmd_tbl_t *cmdtp, int flag, int argc, |
3642 | char * const argv[]) | |
81473f67 HS |
3643 | { |
3644 | int i, k; | |
3645 | int rcode = 0; | |
3646 | struct variables *cur; | |
3647 | ||
3648 | if (argc == 1) { /* Print all env variables */ | |
3649 | for (cur = top_vars; cur; cur = cur->next) { | |
3650 | printf ("%s=%s\n", cur->name, cur->value); | |
3651 | if (ctrlc ()) { | |
3652 | puts ("\n ** Abort\n"); | |
3653 | return 1; | |
3654 | } | |
3655 | } | |
3656 | return 0; | |
3657 | } | |
3658 | for (i = 1; i < argc; ++i) { /* print single env variables */ | |
3659 | char *name = argv[i]; | |
3660 | ||
3661 | k = -1; | |
3662 | for (cur = top_vars; cur; cur = cur->next) { | |
3663 | if(strcmp (cur->name, name) == 0) { | |
3664 | k = 0; | |
3665 | printf ("%s=%s\n", cur->name, cur->value); | |
3666 | } | |
3667 | if (ctrlc ()) { | |
3668 | puts ("\n ** Abort\n"); | |
3669 | return 1; | |
3670 | } | |
3671 | } | |
3672 | if (k < 0) { | |
3673 | printf ("## Error: \"%s\" not defined\n", name); | |
3674 | rcode ++; | |
3675 | } | |
3676 | } | |
3677 | return rcode; | |
3678 | } | |
3679 | ||
3680 | U_BOOT_CMD( | |
6d0f6bcf | 3681 | showvar, CONFIG_SYS_MAXARGS, 1, do_showvar, |
2fb2604d | 3682 | "print local hushshell variables", |
81473f67 HS |
3683 | "\n - print values of all hushshell variables\n" |
3684 | "showvar name ...\n" | |
a89c33db | 3685 | " - print value of hushshell variable 'name'" |
81473f67 HS |
3686 | ); |
3687 | ||
3688 | #endif | |
fe8c2806 | 3689 | /****************************************************************************/ |