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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:
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 *
74 * This program is free software; you can redistribute it and/or modify
75 * it under the terms of the GNU General Public License as published by
76 * the Free Software Foundation; either version 2 of the License, or
77 * (at your option) any later version.
78 *
79 * This program is distributed in the hope that it will be useful,
80 * but WITHOUT ANY WARRANTY; without even the implied warranty of
81 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
82 * General Public License for more details.
83 *
84 * You should have received a copy of the GNU General Public License
85 * along with this program; if not, write to the Free Software
86 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
87 */
88 #define __U_BOOT__
89 #ifdef __U_BOOT__
90 #include <malloc.h> /* malloc, free, realloc*/
91 #include <linux/ctype.h> /* isalpha, isdigit */
92 #include <common.h> /* readline */
93 #include <hush.h>
94 #include <command.h> /* find_cmd */
95 #ifndef CONFIG_SYS_PROMPT_HUSH_PS2
96 #define CONFIG_SYS_PROMPT_HUSH_PS2 "> "
97 #endif
98 #endif
99 #ifndef __U_BOOT__
100 #include <ctype.h> /* isalpha, isdigit */
101 #include <unistd.h> /* getpid */
102 #include <stdlib.h> /* getenv, atoi */
103 #include <string.h> /* strchr */
104 #include <stdio.h> /* popen etc. */
105 #include <glob.h> /* glob, of course */
106 #include <stdarg.h> /* va_list */
107 #include <errno.h>
108 #include <fcntl.h>
109 #include <getopt.h> /* should be pretty obvious */
110
111 #include <sys/stat.h> /* ulimit */
112 #include <sys/types.h>
113 #include <sys/wait.h>
114 #include <signal.h>
115
116 /* #include <dmalloc.h> */
117
118 #if 1
119 #include "busybox.h"
120 #include "cmdedit.h"
121 #else
122 #define applet_name "hush"
123 #include "standalone.h"
124 #define hush_main main
125 #undef CONFIG_FEATURE_SH_FANCY_PROMPT
126 #define BB_BANNER
127 #endif
128 #endif
129 #define SPECIAL_VAR_SYMBOL 03
130 #define SUBSTED_VAR_SYMBOL 04
131 #ifndef __U_BOOT__
132 #define FLAG_EXIT_FROM_LOOP 1
133 #define FLAG_PARSE_SEMICOLON (1 << 1) /* symbol ';' is special for parser */
134 #define FLAG_REPARSING (1 << 2) /* >= 2nd pass */
135
136 #endif
137
138 #ifdef __U_BOOT__
139 DECLARE_GLOBAL_DATA_PTR;
140
141 #define EXIT_SUCCESS 0
142 #define EOF -1
143 #define syntax() syntax_err()
144 #define xstrdup strdup
145 #define error_msg printf
146 #else
147 typedef enum {
148 REDIRECT_INPUT = 1,
149 REDIRECT_OVERWRITE = 2,
150 REDIRECT_APPEND = 3,
151 REDIRECT_HEREIS = 4,
152 REDIRECT_IO = 5
153 } redir_type;
154
155 /* The descrip member of this structure is only used to make debugging
156 * output pretty */
157 struct {int mode; int default_fd; char *descrip;} redir_table[] = {
158 { 0, 0, "()" },
159 { O_RDONLY, 0, "<" },
160 { O_CREAT|O_TRUNC|O_WRONLY, 1, ">" },
161 { O_CREAT|O_APPEND|O_WRONLY, 1, ">>" },
162 { O_RDONLY, -1, "<<" },
163 { O_RDWR, 1, "<>" }
164 };
165 #endif
166
167 typedef enum {
168 PIPE_SEQ = 1,
169 PIPE_AND = 2,
170 PIPE_OR = 3,
171 PIPE_BG = 4,
172 } pipe_style;
173
174 /* might eventually control execution */
175 typedef enum {
176 RES_NONE = 0,
177 RES_IF = 1,
178 RES_THEN = 2,
179 RES_ELIF = 3,
180 RES_ELSE = 4,
181 RES_FI = 5,
182 RES_FOR = 6,
183 RES_WHILE = 7,
184 RES_UNTIL = 8,
185 RES_DO = 9,
186 RES_DONE = 10,
187 RES_XXXX = 11,
188 RES_IN = 12,
189 RES_SNTX = 13
190 } reserved_style;
191 #define FLAG_END (1<<RES_NONE)
192 #define FLAG_IF (1<<RES_IF)
193 #define FLAG_THEN (1<<RES_THEN)
194 #define FLAG_ELIF (1<<RES_ELIF)
195 #define FLAG_ELSE (1<<RES_ELSE)
196 #define FLAG_FI (1<<RES_FI)
197 #define FLAG_FOR (1<<RES_FOR)
198 #define FLAG_WHILE (1<<RES_WHILE)
199 #define FLAG_UNTIL (1<<RES_UNTIL)
200 #define FLAG_DO (1<<RES_DO)
201 #define FLAG_DONE (1<<RES_DONE)
202 #define FLAG_IN (1<<RES_IN)
203 #define FLAG_START (1<<RES_XXXX)
204
205 /* This holds pointers to the various results of parsing */
206 struct p_context {
207 struct child_prog *child;
208 struct pipe *list_head;
209 struct pipe *pipe;
210 #ifndef __U_BOOT__
211 struct redir_struct *pending_redirect;
212 #endif
213 reserved_style w;
214 int old_flag; /* for figuring out valid reserved words */
215 struct p_context *stack;
216 int type; /* define type of parser : ";$" common or special symbol */
217 /* How about quoting status? */
218 };
219
220 #ifndef __U_BOOT__
221 struct redir_struct {
222 redir_type type; /* type of redirection */
223 int fd; /* file descriptor being redirected */
224 int dup; /* -1, or file descriptor being duplicated */
225 struct redir_struct *next; /* pointer to the next redirect in the list */
226 glob_t word; /* *word.gl_pathv is the filename */
227 };
228 #endif
229
230 struct child_prog {
231 #ifndef __U_BOOT__
232 pid_t pid; /* 0 if exited */
233 #endif
234 char **argv; /* program name and arguments */
235 #ifdef __U_BOOT__
236 int argc; /* number of program arguments */
237 #endif
238 struct pipe *group; /* if non-NULL, first in group or subshell */
239 #ifndef __U_BOOT__
240 int subshell; /* flag, non-zero if group must be forked */
241 struct redir_struct *redirects; /* I/O redirections */
242 glob_t glob_result; /* result of parameter globbing */
243 int is_stopped; /* is the program currently running? */
244 struct pipe *family; /* pointer back to the child's parent pipe */
245 #endif
246 int sp; /* number of SPECIAL_VAR_SYMBOL */
247 int type;
248 };
249
250 struct pipe {
251 #ifndef __U_BOOT__
252 int jobid; /* job number */
253 #endif
254 int num_progs; /* total number of programs in job */
255 #ifndef __U_BOOT__
256 int running_progs; /* number of programs running */
257 char *text; /* name of job */
258 char *cmdbuf; /* buffer various argv's point into */
259 pid_t pgrp; /* process group ID for the job */
260 #endif
261 struct child_prog *progs; /* array of commands in pipe */
262 struct pipe *next; /* to track background commands */
263 #ifndef __U_BOOT__
264 int stopped_progs; /* number of programs alive, but stopped */
265 int job_context; /* bitmask defining current context */
266 #endif
267 pipe_style followup; /* PIPE_BG, PIPE_SEQ, PIPE_OR, PIPE_AND */
268 reserved_style r_mode; /* supports if, for, while, until */
269 };
270
271 #ifndef __U_BOOT__
272 struct close_me {
273 int fd;
274 struct close_me *next;
275 };
276 #endif
277
278 struct variables {
279 char *name;
280 char *value;
281 int flg_export;
282 int flg_read_only;
283 struct variables *next;
284 };
285
286 /* globals, connect us to the outside world
287 * the first three support $?, $#, and $1 */
288 #ifndef __U_BOOT__
289 char **global_argv;
290 unsigned int global_argc;
291 #endif
292 static unsigned int last_return_code;
293 #ifndef __U_BOOT__
294 extern char **environ; /* This is in <unistd.h>, but protected with __USE_GNU */
295 #endif
296
297 /* "globals" within this file */
298 static uchar *ifs;
299 static char map[256];
300 #ifndef __U_BOOT__
301 static int fake_mode;
302 static int interactive;
303 static struct close_me *close_me_head;
304 static const char *cwd;
305 static struct pipe *job_list;
306 static unsigned int last_bg_pid;
307 static unsigned int last_jobid;
308 static unsigned int shell_terminal;
309 static char *PS1;
310 static char *PS2;
311 struct variables shell_ver = { "HUSH_VERSION", "0.01", 1, 1, 0 };
312 struct variables *top_vars = &shell_ver;
313 #else
314 static int flag_repeat = 0;
315 static int do_repeat = 0;
316 static struct variables *top_vars = NULL ;
317 #endif /*__U_BOOT__ */
318
319 #define B_CHUNK (100)
320 #define B_NOSPAC 1
321
322 typedef struct {
323 char *data;
324 int length;
325 int maxlen;
326 int quote;
327 int nonnull;
328 } o_string;
329 #define NULL_O_STRING {NULL,0,0,0,0}
330 /* used for initialization:
331 o_string foo = NULL_O_STRING; */
332
333 /* I can almost use ordinary FILE *. Is open_memstream() universally
334 * available? Where is it documented? */
335 struct in_str {
336 const char *p;
337 #ifndef __U_BOOT__
338 char peek_buf[2];
339 #endif
340 int __promptme;
341 int promptmode;
342 #ifndef __U_BOOT__
343 FILE *file;
344 #endif
345 int (*get) (struct in_str *);
346 int (*peek) (struct in_str *);
347 };
348 #define b_getch(input) ((input)->get(input))
349 #define b_peek(input) ((input)->peek(input))
350
351 #ifndef __U_BOOT__
352 #define JOB_STATUS_FORMAT "[%d] %-22s %.40s\n"
353
354 struct built_in_command {
355 char *cmd; /* name */
356 char *descr; /* description */
357 int (*function) (struct child_prog *); /* function ptr */
358 };
359 #endif
360
361 /* define DEBUG_SHELL for debugging output (obviously ;-)) */
362 #if 0
363 #define DEBUG_SHELL
364 #endif
365
366 /* This should be in utility.c */
367 #ifdef DEBUG_SHELL
368 #ifndef __U_BOOT__
369 static void debug_printf(const char *format, ...)
370 {
371 va_list args;
372 va_start(args, format);
373 vfprintf(stderr, format, args);
374 va_end(args);
375 }
376 #else
377 #define debug_printf(fmt,args...) printf (fmt ,##args)
378 #endif
379 #else
380 static inline void debug_printf(const char *format, ...) { }
381 #endif
382 #define final_printf debug_printf
383
384 #ifdef __U_BOOT__
385 static void syntax_err(void) {
386 printf("syntax error\n");
387 }
388 #else
389 static void __syntax(char *file, int line) {
390 error_msg("syntax error %s:%d", file, line);
391 }
392 #define syntax() __syntax(__FILE__, __LINE__)
393 #endif
394
395 #ifdef __U_BOOT__
396 static void *xmalloc(size_t size);
397 static void *xrealloc(void *ptr, size_t size);
398 #else
399 /* Index of subroutines: */
400 /* function prototypes for builtins */
401 static int builtin_cd(struct child_prog *child);
402 static int builtin_env(struct child_prog *child);
403 static int builtin_eval(struct child_prog *child);
404 static int builtin_exec(struct child_prog *child);
405 static int builtin_exit(struct child_prog *child);
406 static int builtin_export(struct child_prog *child);
407 static int builtin_fg_bg(struct child_prog *child);
408 static int builtin_help(struct child_prog *child);
409 static int builtin_jobs(struct child_prog *child);
410 static int builtin_pwd(struct child_prog *child);
411 static int builtin_read(struct child_prog *child);
412 static int builtin_set(struct child_prog *child);
413 static int builtin_shift(struct child_prog *child);
414 static int builtin_source(struct child_prog *child);
415 static int builtin_umask(struct child_prog *child);
416 static int builtin_unset(struct child_prog *child);
417 static int builtin_not_written(struct child_prog *child);
418 #endif
419 /* o_string manipulation: */
420 static int b_check_space(o_string *o, int len);
421 static int b_addchr(o_string *o, int ch);
422 static void b_reset(o_string *o);
423 static int b_addqchr(o_string *o, int ch, int quote);
424 #ifndef __U_BOOT__
425 static int b_adduint(o_string *o, unsigned int i);
426 #endif
427 /* in_str manipulations: */
428 static int static_get(struct in_str *i);
429 static int static_peek(struct in_str *i);
430 static int file_get(struct in_str *i);
431 static int file_peek(struct in_str *i);
432 #ifndef __U_BOOT__
433 static void setup_file_in_str(struct in_str *i, FILE *f);
434 #else
435 static void setup_file_in_str(struct in_str *i);
436 #endif
437 static void setup_string_in_str(struct in_str *i, const char *s);
438 #ifndef __U_BOOT__
439 /* close_me manipulations: */
440 static void mark_open(int fd);
441 static void mark_closed(int fd);
442 static void close_all(void);
443 #endif
444 /* "run" the final data structures: */
445 static char *indenter(int i);
446 static int free_pipe_list(struct pipe *head, int indent);
447 static int free_pipe(struct pipe *pi, int indent);
448 /* really run the final data structures: */
449 #ifndef __U_BOOT__
450 static int setup_redirects(struct child_prog *prog, int squirrel[]);
451 #endif
452 static int run_list_real(struct pipe *pi);
453 #ifndef __U_BOOT__
454 static void pseudo_exec(struct child_prog *child) __attribute__ ((noreturn));
455 #endif
456 static int run_pipe_real(struct pipe *pi);
457 /* extended glob support: */
458 #ifndef __U_BOOT__
459 static int globhack(const char *src, int flags, glob_t *pglob);
460 static int glob_needed(const char *s);
461 static int xglob(o_string *dest, int flags, glob_t *pglob);
462 #endif
463 /* variable assignment: */
464 static int is_assignment(const char *s);
465 /* data structure manipulation: */
466 #ifndef __U_BOOT__
467 static int setup_redirect(struct p_context *ctx, int fd, redir_type style, struct in_str *input);
468 #endif
469 static void initialize_context(struct p_context *ctx);
470 static int done_word(o_string *dest, struct p_context *ctx);
471 static int done_command(struct p_context *ctx);
472 static int done_pipe(struct p_context *ctx, pipe_style type);
473 /* primary string parsing: */
474 #ifndef __U_BOOT__
475 static int redirect_dup_num(struct in_str *input);
476 static int redirect_opt_num(o_string *o);
477 static int process_command_subs(o_string *dest, struct p_context *ctx, struct in_str *input, int subst_end);
478 static int parse_group(o_string *dest, struct p_context *ctx, struct in_str *input, int ch);
479 #endif
480 static char *lookup_param(char *src);
481 static char *make_string(char **inp);
482 static int handle_dollar(o_string *dest, struct p_context *ctx, struct in_str *input);
483 #ifndef __U_BOOT__
484 static int parse_string(o_string *dest, struct p_context *ctx, const char *src);
485 #endif
486 static int parse_stream(o_string *dest, struct p_context *ctx, struct in_str *input0, int end_trigger);
487 /* setup: */
488 static int parse_stream_outer(struct in_str *inp, int flag);
489 #ifndef __U_BOOT__
490 static int parse_string_outer(const char *s, int flag);
491 static int parse_file_outer(FILE *f);
492 #endif
493 #ifndef __U_BOOT__
494 /* job management: */
495 static int checkjobs(struct pipe* fg_pipe);
496 static void insert_bg_job(struct pipe *pi);
497 static void remove_bg_job(struct pipe *pi);
498 #endif
499 /* local variable support */
500 static char **make_list_in(char **inp, char *name);
501 static char *insert_var_value(char *inp);
502 static char *insert_var_value_sub(char *inp, int tag_subst);
503
504 #ifndef __U_BOOT__
505 /* Table of built-in functions. They can be forked or not, depending on
506 * context: within pipes, they fork. As simple commands, they do not.
507 * When used in non-forking context, they can change global variables
508 * in the parent shell process. If forked, of course they can not.
509 * For example, 'unset foo | whatever' will parse and run, but foo will
510 * still be set at the end. */
511 static struct built_in_command bltins[] = {
512 {"bg", "Resume a job in the background", builtin_fg_bg},
513 {"break", "Exit for, while or until loop", builtin_not_written},
514 {"cd", "Change working directory", builtin_cd},
515 {"continue", "Continue for, while or until loop", builtin_not_written},
516 {"env", "Print all environment variables", builtin_env},
517 {"eval", "Construct and run shell command", builtin_eval},
518 {"exec", "Exec command, replacing this shell with the exec'd process",
519 builtin_exec},
520 {"exit", "Exit from shell()", builtin_exit},
521 {"export", "Set environment variable", builtin_export},
522 {"fg", "Bring job into the foreground", builtin_fg_bg},
523 {"jobs", "Lists the active jobs", builtin_jobs},
524 {"pwd", "Print current directory", builtin_pwd},
525 {"read", "Input environment variable", builtin_read},
526 {"return", "Return from a function", builtin_not_written},
527 {"set", "Set/unset shell local variables", builtin_set},
528 {"shift", "Shift positional parameters", builtin_shift},
529 {"trap", "Trap signals", builtin_not_written},
530 {"ulimit","Controls resource limits", builtin_not_written},
531 {"umask","Sets file creation mask", builtin_umask},
532 {"unset", "Unset environment variable", builtin_unset},
533 {".", "Source-in and run commands in a file", builtin_source},
534 {"help", "List shell built-in commands", builtin_help},
535 {NULL, NULL, NULL}
536 };
537
538 static const char *set_cwd(void)
539 {
540 if(cwd==unknown)
541 cwd = NULL; /* xgetcwd(arg) called free(arg) */
542 cwd = xgetcwd((char *)cwd);
543 if (!cwd)
544 cwd = unknown;
545 return cwd;
546 }
547
548 /* built-in 'eval' handler */
549 static int builtin_eval(struct child_prog *child)
550 {
551 char *str = NULL;
552 int rcode = EXIT_SUCCESS;
553
554 if (child->argv[1]) {
555 str = make_string(child->argv + 1);
556 parse_string_outer(str, FLAG_EXIT_FROM_LOOP |
557 FLAG_PARSE_SEMICOLON);
558 free(str);
559 rcode = last_return_code;
560 }
561 return rcode;
562 }
563
564 /* built-in 'cd <path>' handler */
565 static int builtin_cd(struct child_prog *child)
566 {
567 char *newdir;
568 if (child->argv[1] == NULL)
569 newdir = getenv("HOME");
570 else
571 newdir = child->argv[1];
572 if (chdir(newdir)) {
573 printf("cd: %s: %s\n", newdir, strerror(errno));
574 return EXIT_FAILURE;
575 }
576 set_cwd();
577 return EXIT_SUCCESS;
578 }
579
580 /* built-in 'env' handler */
581 static int builtin_env(struct child_prog *dummy)
582 {
583 char **e = environ;
584 if (e == NULL) return EXIT_FAILURE;
585 for (; *e; e++) {
586 puts(*e);
587 }
588 return EXIT_SUCCESS;
589 }
590
591 /* built-in 'exec' handler */
592 static int builtin_exec(struct child_prog *child)
593 {
594 if (child->argv[1] == NULL)
595 return EXIT_SUCCESS; /* Really? */
596 child->argv++;
597 pseudo_exec(child);
598 /* never returns */
599 }
600
601 /* built-in 'exit' handler */
602 static int builtin_exit(struct child_prog *child)
603 {
604 if (child->argv[1] == NULL)
605 exit(last_return_code);
606 exit (atoi(child->argv[1]));
607 }
608
609 /* built-in 'export VAR=value' handler */
610 static int builtin_export(struct child_prog *child)
611 {
612 int res = 0;
613 char *name = child->argv[1];
614
615 if (name == NULL) {
616 return (builtin_env(child));
617 }
618
619 name = strdup(name);
620
621 if(name) {
622 char *value = strchr(name, '=');
623
624 if (!value) {
625 char *tmp;
626 /* They are exporting something without an =VALUE */
627
628 value = get_local_var(name);
629 if (value) {
630 size_t ln = strlen(name);
631
632 tmp = realloc(name, ln+strlen(value)+2);
633 if(tmp==NULL)
634 res = -1;
635 else {
636 sprintf(tmp+ln, "=%s", value);
637 name = tmp;
638 }
639 } else {
640 /* bash does not return an error when trying to export
641 * an undefined variable. Do likewise. */
642 res = 1;
643 }
644 }
645 }
646 if (res<0)
647 perror_msg("export");
648 else if(res==0)
649 res = set_local_var(name, 1);
650 else
651 res = 0;
652 free(name);
653 return res;
654 }
655
656 /* built-in 'fg' and 'bg' handler */
657 static int builtin_fg_bg(struct child_prog *child)
658 {
659 int i, jobnum;
660 struct pipe *pi=NULL;
661
662 if (!interactive)
663 return EXIT_FAILURE;
664 /* If they gave us no args, assume they want the last backgrounded task */
665 if (!child->argv[1]) {
666 for (pi = job_list; pi; pi = pi->next) {
667 if (pi->jobid == last_jobid) {
668 break;
669 }
670 }
671 if (!pi) {
672 error_msg("%s: no current job", child->argv[0]);
673 return EXIT_FAILURE;
674 }
675 } else {
676 if (sscanf(child->argv[1], "%%%d", &jobnum) != 1) {
677 error_msg("%s: bad argument '%s'", child->argv[0], child->argv[1]);
678 return EXIT_FAILURE;
679 }
680 for (pi = job_list; pi; pi = pi->next) {
681 if (pi->jobid == jobnum) {
682 break;
683 }
684 }
685 if (!pi) {
686 error_msg("%s: %d: no such job", child->argv[0], jobnum);
687 return EXIT_FAILURE;
688 }
689 }
690
691 if (*child->argv[0] == 'f') {
692 /* Put the job into the foreground. */
693 tcsetpgrp(shell_terminal, pi->pgrp);
694 }
695
696 /* Restart the processes in the job */
697 for (i = 0; i < pi->num_progs; i++)
698 pi->progs[i].is_stopped = 0;
699
700 if ( (i=kill(- pi->pgrp, SIGCONT)) < 0) {
701 if (i == ESRCH) {
702 remove_bg_job(pi);
703 } else {
704 perror_msg("kill (SIGCONT)");
705 }
706 }
707
708 pi->stopped_progs = 0;
709 return EXIT_SUCCESS;
710 }
711
712 /* built-in 'help' handler */
713 static int builtin_help(struct child_prog *dummy)
714 {
715 struct built_in_command *x;
716
717 printf("\nBuilt-in commands:\n");
718 printf("-------------------\n");
719 for (x = bltins; x->cmd; x++) {
720 if (x->descr==NULL)
721 continue;
722 printf("%s\t%s\n", x->cmd, x->descr);
723 }
724 printf("\n\n");
725 return EXIT_SUCCESS;
726 }
727
728 /* built-in 'jobs' handler */
729 static int builtin_jobs(struct child_prog *child)
730 {
731 struct pipe *job;
732 char *status_string;
733
734 for (job = job_list; job; job = job->next) {
735 if (job->running_progs == job->stopped_progs)
736 status_string = "Stopped";
737 else
738 status_string = "Running";
739
740 printf(JOB_STATUS_FORMAT, job->jobid, status_string, job->text);
741 }
742 return EXIT_SUCCESS;
743 }
744
745
746 /* built-in 'pwd' handler */
747 static int builtin_pwd(struct child_prog *dummy)
748 {
749 puts(set_cwd());
750 return EXIT_SUCCESS;
751 }
752
753 /* built-in 'read VAR' handler */
754 static int builtin_read(struct child_prog *child)
755 {
756 int res;
757
758 if (child->argv[1]) {
759 char string[BUFSIZ];
760 char *var = 0;
761
762 string[0] = 0; /* In case stdin has only EOF */
763 /* read string */
764 fgets(string, sizeof(string), stdin);
765 chomp(string);
766 var = malloc(strlen(child->argv[1])+strlen(string)+2);
767 if(var) {
768 sprintf(var, "%s=%s", child->argv[1], string);
769 res = set_local_var(var, 0);
770 } else
771 res = -1;
772 if (res)
773 fprintf(stderr, "read: %m\n");
774 free(var); /* So not move up to avoid breaking errno */
775 return res;
776 } else {
777 do res=getchar(); while(res!='\n' && res!=EOF);
778 return 0;
779 }
780 }
781
782 /* built-in 'set VAR=value' handler */
783 static int builtin_set(struct child_prog *child)
784 {
785 char *temp = child->argv[1];
786 struct variables *e;
787
788 if (temp == NULL)
789 for(e = top_vars; e; e=e->next)
790 printf("%s=%s\n", e->name, e->value);
791 else
792 set_local_var(temp, 0);
793
794 return EXIT_SUCCESS;
795 }
796
797
798 /* Built-in 'shift' handler */
799 static int builtin_shift(struct child_prog *child)
800 {
801 int n=1;
802 if (child->argv[1]) {
803 n=atoi(child->argv[1]);
804 }
805 if (n>=0 && n<global_argc) {
806 /* XXX This probably breaks $0 */
807 global_argc -= n;
808 global_argv += n;
809 return EXIT_SUCCESS;
810 } else {
811 return EXIT_FAILURE;
812 }
813 }
814
815 /* Built-in '.' handler (read-in and execute commands from file) */
816 static int builtin_source(struct child_prog *child)
817 {
818 FILE *input;
819 int status;
820
821 if (child->argv[1] == NULL)
822 return EXIT_FAILURE;
823
824 /* XXX search through $PATH is missing */
825 input = fopen(child->argv[1], "r");
826 if (!input) {
827 error_msg("Couldn't open file '%s'", child->argv[1]);
828 return EXIT_FAILURE;
829 }
830
831 /* Now run the file */
832 /* XXX argv and argc are broken; need to save old global_argv
833 * (pointer only is OK!) on this stack frame,
834 * set global_argv=child->argv+1, recurse, and restore. */
835 mark_open(fileno(input));
836 status = parse_file_outer(input);
837 mark_closed(fileno(input));
838 fclose(input);
839 return (status);
840 }
841
842 static int builtin_umask(struct child_prog *child)
843 {
844 mode_t new_umask;
845 const char *arg = child->argv[1];
846 char *end;
847 if (arg) {
848 new_umask=strtoul(arg, &end, 8);
849 if (*end!='\0' || end == arg) {
850 return EXIT_FAILURE;
851 }
852 } else {
853 printf("%.3o\n", (unsigned int) (new_umask=umask(0)));
854 }
855 umask(new_umask);
856 return EXIT_SUCCESS;
857 }
858
859 /* built-in 'unset VAR' handler */
860 static int builtin_unset(struct child_prog *child)
861 {
862 /* bash returned already true */
863 unset_local_var(child->argv[1]);
864 return EXIT_SUCCESS;
865 }
866
867 static int builtin_not_written(struct child_prog *child)
868 {
869 printf("builtin_%s not written\n",child->argv[0]);
870 return EXIT_FAILURE;
871 }
872 #endif
873
874 static int b_check_space(o_string *o, int len)
875 {
876 /* It would be easy to drop a more restrictive policy
877 * in here, such as setting a maximum string length */
878 if (o->length + len > o->maxlen) {
879 char *old_data = o->data;
880 /* assert (data == NULL || o->maxlen != 0); */
881 o->maxlen += max(2*len, B_CHUNK);
882 o->data = realloc(o->data, 1 + o->maxlen);
883 if (o->data == NULL) {
884 free(old_data);
885 }
886 }
887 return o->data == NULL;
888 }
889
890 static int b_addchr(o_string *o, int ch)
891 {
892 debug_printf("b_addchr: %c %d %p\n", ch, o->length, o);
893 if (b_check_space(o, 1)) return B_NOSPAC;
894 o->data[o->length] = ch;
895 o->length++;
896 o->data[o->length] = '\0';
897 return 0;
898 }
899
900 static void b_reset(o_string *o)
901 {
902 o->length = 0;
903 o->nonnull = 0;
904 if (o->data != NULL) *o->data = '\0';
905 }
906
907 static void b_free(o_string *o)
908 {
909 b_reset(o);
910 free(o->data);
911 o->data = NULL;
912 o->maxlen = 0;
913 }
914
915 /* My analysis of quoting semantics tells me that state information
916 * is associated with a destination, not a source.
917 */
918 static int b_addqchr(o_string *o, int ch, int quote)
919 {
920 if (quote && strchr("*?[\\",ch)) {
921 int rc;
922 rc = b_addchr(o, '\\');
923 if (rc) return rc;
924 }
925 return b_addchr(o, ch);
926 }
927
928 #ifndef __U_BOOT__
929 static int b_adduint(o_string *o, unsigned int i)
930 {
931 int r;
932 char *p = simple_itoa(i);
933 /* no escape checking necessary */
934 do r=b_addchr(o, *p++); while (r==0 && *p);
935 return r;
936 }
937 #endif
938
939 static int static_get(struct in_str *i)
940 {
941 int ch = *i->p++;
942 if (ch=='\0') return EOF;
943 return ch;
944 }
945
946 static int static_peek(struct in_str *i)
947 {
948 return *i->p;
949 }
950
951 #ifndef __U_BOOT__
952 static inline void cmdedit_set_initial_prompt(void)
953 {
954 #ifndef CONFIG_FEATURE_SH_FANCY_PROMPT
955 PS1 = NULL;
956 #else
957 PS1 = getenv("PS1");
958 if(PS1==0)
959 PS1 = "\\w \\$ ";
960 #endif
961 }
962
963 static inline void setup_prompt_string(int promptmode, char **prompt_str)
964 {
965 debug_printf("setup_prompt_string %d ",promptmode);
966 #ifndef CONFIG_FEATURE_SH_FANCY_PROMPT
967 /* Set up the prompt */
968 if (promptmode == 1) {
969 free(PS1);
970 PS1=xmalloc(strlen(cwd)+4);
971 sprintf(PS1, "%s %s", cwd, ( geteuid() != 0 ) ? "$ ":"# ");
972 *prompt_str = PS1;
973 } else {
974 *prompt_str = PS2;
975 }
976 #else
977 *prompt_str = (promptmode==1)? PS1 : PS2;
978 #endif
979 debug_printf("result %s\n",*prompt_str);
980 }
981 #endif
982
983 static void get_user_input(struct in_str *i)
984 {
985 #ifndef __U_BOOT__
986 char *prompt_str;
987 static char the_command[BUFSIZ];
988
989 setup_prompt_string(i->promptmode, &prompt_str);
990 #ifdef CONFIG_FEATURE_COMMAND_EDITING
991 /*
992 ** enable command line editing only while a command line
993 ** is actually being read; otherwise, we'll end up bequeathing
994 ** atexit() handlers and other unwanted stuff to our
995 ** child processes (rob@sysgo.de)
996 */
997 cmdedit_read_input(prompt_str, the_command);
998 #else
999 fputs(prompt_str, stdout);
1000 fflush(stdout);
1001 the_command[0]=fgetc(i->file);
1002 the_command[1]='\0';
1003 #endif
1004 fflush(stdout);
1005 i->p = the_command;
1006 #else
1007 int n;
1008 static char the_command[CONFIG_SYS_CBSIZE];
1009
1010 #ifdef CONFIG_BOOT_RETRY_TIME
1011 # ifndef CONFIG_RESET_TO_RETRY
1012 # error "This currently only works with CONFIG_RESET_TO_RETRY enabled"
1013 # endif
1014 reset_cmd_timeout();
1015 #endif
1016 i->__promptme = 1;
1017 if (i->promptmode == 1) {
1018 n = readline(CONFIG_SYS_PROMPT);
1019 } else {
1020 n = readline(CONFIG_SYS_PROMPT_HUSH_PS2);
1021 }
1022 #ifdef CONFIG_BOOT_RETRY_TIME
1023 if (n == -2) {
1024 puts("\nTimeout waiting for command\n");
1025 # ifdef CONFIG_RESET_TO_RETRY
1026 do_reset(NULL, 0, 0, NULL);
1027 # else
1028 # error "This currently only works with CONFIG_RESET_TO_RETRY enabled"
1029 # endif
1030 }
1031 #endif
1032 if (n == -1 ) {
1033 flag_repeat = 0;
1034 i->__promptme = 0;
1035 }
1036 n = strlen(console_buffer);
1037 console_buffer[n] = '\n';
1038 console_buffer[n+1]= '\0';
1039 if (had_ctrlc()) flag_repeat = 0;
1040 clear_ctrlc();
1041 do_repeat = 0;
1042 if (i->promptmode == 1) {
1043 if (console_buffer[0] == '\n'&& flag_repeat == 0) {
1044 strcpy(the_command,console_buffer);
1045 }
1046 else {
1047 if (console_buffer[0] != '\n') {
1048 strcpy(the_command,console_buffer);
1049 flag_repeat = 1;
1050 }
1051 else {
1052 do_repeat = 1;
1053 }
1054 }
1055 i->p = the_command;
1056 }
1057 else {
1058 if (console_buffer[0] != '\n') {
1059 if (strlen(the_command) + strlen(console_buffer)
1060 < CONFIG_SYS_CBSIZE) {
1061 n = strlen(the_command);
1062 the_command[n-1] = ' ';
1063 strcpy(&the_command[n],console_buffer);
1064 }
1065 else {
1066 the_command[0] = '\n';
1067 the_command[1] = '\0';
1068 flag_repeat = 0;
1069 }
1070 }
1071 if (i->__promptme == 0) {
1072 the_command[0] = '\n';
1073 the_command[1] = '\0';
1074 }
1075 i->p = console_buffer;
1076 }
1077 #endif
1078 }
1079
1080 /* This is the magic location that prints prompts
1081 * and gets data back from the user */
1082 static int file_get(struct in_str *i)
1083 {
1084 int ch;
1085
1086 ch = 0;
1087 /* If there is data waiting, eat it up */
1088 if (i->p && *i->p) {
1089 ch = *i->p++;
1090 } else {
1091 /* need to double check i->file because we might be doing something
1092 * more complicated by now, like sourcing or substituting. */
1093 #ifndef __U_BOOT__
1094 if (i->__promptme && interactive && i->file == stdin) {
1095 while(! i->p || (interactive && strlen(i->p)==0) ) {
1096 #else
1097 while(! i->p || strlen(i->p)==0 ) {
1098 #endif
1099 get_user_input(i);
1100 }
1101 i->promptmode=2;
1102 #ifndef __U_BOOT__
1103 i->__promptme = 0;
1104 #endif
1105 if (i->p && *i->p) {
1106 ch = *i->p++;
1107 }
1108 #ifndef __U_BOOT__
1109 } else {
1110 ch = fgetc(i->file);
1111 }
1112
1113 #endif
1114 debug_printf("b_getch: got a %d\n", ch);
1115 }
1116 #ifndef __U_BOOT__
1117 if (ch == '\n') i->__promptme=1;
1118 #endif
1119 return ch;
1120 }
1121
1122 /* All the callers guarantee this routine will never be
1123 * used right after a newline, so prompting is not needed.
1124 */
1125 static int file_peek(struct in_str *i)
1126 {
1127 #ifndef __U_BOOT__
1128 if (i->p && *i->p) {
1129 #endif
1130 return *i->p;
1131 #ifndef __U_BOOT__
1132 } else {
1133 i->peek_buf[0] = fgetc(i->file);
1134 i->peek_buf[1] = '\0';
1135 i->p = i->peek_buf;
1136 debug_printf("b_peek: got a %d\n", *i->p);
1137 return *i->p;
1138 }
1139 #endif
1140 }
1141
1142 #ifndef __U_BOOT__
1143 static void setup_file_in_str(struct in_str *i, FILE *f)
1144 #else
1145 static void setup_file_in_str(struct in_str *i)
1146 #endif
1147 {
1148 i->peek = file_peek;
1149 i->get = file_get;
1150 i->__promptme=1;
1151 i->promptmode=1;
1152 #ifndef __U_BOOT__
1153 i->file = f;
1154 #endif
1155 i->p = NULL;
1156 }
1157
1158 static void setup_string_in_str(struct in_str *i, const char *s)
1159 {
1160 i->peek = static_peek;
1161 i->get = static_get;
1162 i->__promptme=1;
1163 i->promptmode=1;
1164 i->p = s;
1165 }
1166
1167 #ifndef __U_BOOT__
1168 static void mark_open(int fd)
1169 {
1170 struct close_me *new = xmalloc(sizeof(struct close_me));
1171 new->fd = fd;
1172 new->next = close_me_head;
1173 close_me_head = new;
1174 }
1175
1176 static void mark_closed(int fd)
1177 {
1178 struct close_me *tmp;
1179 if (close_me_head == NULL || close_me_head->fd != fd)
1180 error_msg_and_die("corrupt close_me");
1181 tmp = close_me_head;
1182 close_me_head = close_me_head->next;
1183 free(tmp);
1184 }
1185
1186 static void close_all(void)
1187 {
1188 struct close_me *c;
1189 for (c=close_me_head; c; c=c->next) {
1190 close(c->fd);
1191 }
1192 close_me_head = NULL;
1193 }
1194
1195 /* squirrel != NULL means we squirrel away copies of stdin, stdout,
1196 * and stderr if they are redirected. */
1197 static int setup_redirects(struct child_prog *prog, int squirrel[])
1198 {
1199 int openfd, mode;
1200 struct redir_struct *redir;
1201
1202 for (redir=prog->redirects; redir; redir=redir->next) {
1203 if (redir->dup == -1 && redir->word.gl_pathv == NULL) {
1204 /* something went wrong in the parse. Pretend it didn't happen */
1205 continue;
1206 }
1207 if (redir->dup == -1) {
1208 mode=redir_table[redir->type].mode;
1209 openfd = open(redir->word.gl_pathv[0], mode, 0666);
1210 if (openfd < 0) {
1211 /* this could get lost if stderr has been redirected, but
1212 bash and ash both lose it as well (though zsh doesn't!) */
1213 perror_msg("error opening %s", redir->word.gl_pathv[0]);
1214 return 1;
1215 }
1216 } else {
1217 openfd = redir->dup;
1218 }
1219
1220 if (openfd != redir->fd) {
1221 if (squirrel && redir->fd < 3) {
1222 squirrel[redir->fd] = dup(redir->fd);
1223 }
1224 if (openfd == -3) {
1225 close(openfd);
1226 } else {
1227 dup2(openfd, redir->fd);
1228 if (redir->dup == -1)
1229 close (openfd);
1230 }
1231 }
1232 }
1233 return 0;
1234 }
1235
1236 static void restore_redirects(int squirrel[])
1237 {
1238 int i, fd;
1239 for (i=0; i<3; i++) {
1240 fd = squirrel[i];
1241 if (fd != -1) {
1242 /* No error checking. I sure wouldn't know what
1243 * to do with an error if I found one! */
1244 dup2(fd, i);
1245 close(fd);
1246 }
1247 }
1248 }
1249
1250 /* never returns */
1251 /* XXX no exit() here. If you don't exec, use _exit instead.
1252 * The at_exit handlers apparently confuse the calling process,
1253 * in particular stdin handling. Not sure why? */
1254 static void pseudo_exec(struct child_prog *child)
1255 {
1256 int i, rcode;
1257 char *p;
1258 struct built_in_command *x;
1259 if (child->argv) {
1260 for (i=0; is_assignment(child->argv[i]); i++) {
1261 debug_printf("pid %d environment modification: %s\n",getpid(),child->argv[i]);
1262 p = insert_var_value(child->argv[i]);
1263 putenv(strdup(p));
1264 if (p != child->argv[i]) free(p);
1265 }
1266 child->argv+=i; /* XXX this hack isn't so horrible, since we are about
1267 to exit, and therefore don't need to keep data
1268 structures consistent for free() use. */
1269 /* If a variable is assigned in a forest, and nobody listens,
1270 * was it ever really set?
1271 */
1272 if (child->argv[0] == NULL) {
1273 _exit(EXIT_SUCCESS);
1274 }
1275
1276 /*
1277 * Check if the command matches any of the builtins.
1278 * Depending on context, this might be redundant. But it's
1279 * easier to waste a few CPU cycles than it is to figure out
1280 * if this is one of those cases.
1281 */
1282 for (x = bltins; x->cmd; x++) {
1283 if (strcmp(child->argv[0], x->cmd) == 0 ) {
1284 debug_printf("builtin exec %s\n", child->argv[0]);
1285 rcode = x->function(child);
1286 fflush(stdout);
1287 _exit(rcode);
1288 }
1289 }
1290
1291 /* Check if the command matches any busybox internal commands
1292 * ("applets") here.
1293 * FIXME: This feature is not 100% safe, since
1294 * BusyBox is not fully reentrant, so we have no guarantee the things
1295 * from the .bss are still zeroed, or that things from .data are still
1296 * at their defaults. We could exec ourself from /proc/self/exe, but I
1297 * really dislike relying on /proc for things. We could exec ourself
1298 * from global_argv[0], but if we are in a chroot, we may not be able
1299 * to find ourself... */
1300 #ifdef CONFIG_FEATURE_SH_STANDALONE_SHELL
1301 {
1302 int argc_l;
1303 char** argv_l=child->argv;
1304 char *name = child->argv[0];
1305
1306 #ifdef CONFIG_FEATURE_SH_APPLETS_ALWAYS_WIN
1307 /* Following discussions from November 2000 on the busybox mailing
1308 * list, the default configuration, (without
1309 * get_last_path_component()) lets the user force use of an
1310 * external command by specifying the full (with slashes) filename.
1311 * If you enable CONFIG_FEATURE_SH_APPLETS_ALWAYS_WIN then applets
1312 * _aways_ override external commands, so if you want to run
1313 * /bin/cat, it will use BusyBox cat even if /bin/cat exists on the
1314 * filesystem and is _not_ busybox. Some systems may want this,
1315 * most do not. */
1316 name = get_last_path_component(name);
1317 #endif
1318 /* Count argc for use in a second... */
1319 for(argc_l=0;*argv_l!=NULL; argv_l++, argc_l++);
1320 optind = 1;
1321 debug_printf("running applet %s\n", name);
1322 run_applet_by_name(name, argc_l, child->argv);
1323 }
1324 #endif
1325 debug_printf("exec of %s\n",child->argv[0]);
1326 execvp(child->argv[0],child->argv);
1327 perror_msg("couldn't exec: %s",child->argv[0]);
1328 _exit(1);
1329 } else if (child->group) {
1330 debug_printf("runtime nesting to group\n");
1331 interactive=0; /* crucial!!!! */
1332 rcode = run_list_real(child->group);
1333 /* OK to leak memory by not calling free_pipe_list,
1334 * since this process is about to exit */
1335 _exit(rcode);
1336 } else {
1337 /* Can happen. See what bash does with ">foo" by itself. */
1338 debug_printf("trying to pseudo_exec null command\n");
1339 _exit(EXIT_SUCCESS);
1340 }
1341 }
1342
1343 static void insert_bg_job(struct pipe *pi)
1344 {
1345 struct pipe *thejob;
1346
1347 /* Linear search for the ID of the job to use */
1348 pi->jobid = 1;
1349 for (thejob = job_list; thejob; thejob = thejob->next)
1350 if (thejob->jobid >= pi->jobid)
1351 pi->jobid = thejob->jobid + 1;
1352
1353 /* add thejob to the list of running jobs */
1354 if (!job_list) {
1355 thejob = job_list = xmalloc(sizeof(*thejob));
1356 } else {
1357 for (thejob = job_list; thejob->next; thejob = thejob->next) /* nothing */;
1358 thejob->next = xmalloc(sizeof(*thejob));
1359 thejob = thejob->next;
1360 }
1361
1362 /* physically copy the struct job */
1363 memcpy(thejob, pi, sizeof(struct pipe));
1364 thejob->next = NULL;
1365 thejob->running_progs = thejob->num_progs;
1366 thejob->stopped_progs = 0;
1367 thejob->text = xmalloc(BUFSIZ); /* cmdedit buffer size */
1368
1369 /*if (pi->progs[0] && pi->progs[0].argv && pi->progs[0].argv[0]) */
1370 {
1371 char *bar=thejob->text;
1372 char **foo=pi->progs[0].argv;
1373 while(foo && *foo) {
1374 bar += sprintf(bar, "%s ", *foo++);
1375 }
1376 }
1377
1378 /* we don't wait for background thejobs to return -- append it
1379 to the list of backgrounded thejobs and leave it alone */
1380 printf("[%d] %d\n", thejob->jobid, thejob->progs[0].pid);
1381 last_bg_pid = thejob->progs[0].pid;
1382 last_jobid = thejob->jobid;
1383 }
1384
1385 /* remove a backgrounded job */
1386 static void remove_bg_job(struct pipe *pi)
1387 {
1388 struct pipe *prev_pipe;
1389
1390 if (pi == job_list) {
1391 job_list = pi->next;
1392 } else {
1393 prev_pipe = job_list;
1394 while (prev_pipe->next != pi)
1395 prev_pipe = prev_pipe->next;
1396 prev_pipe->next = pi->next;
1397 }
1398 if (job_list)
1399 last_jobid = job_list->jobid;
1400 else
1401 last_jobid = 0;
1402
1403 pi->stopped_progs = 0;
1404 free_pipe(pi, 0);
1405 free(pi);
1406 }
1407
1408 /* Checks to see if any processes have exited -- if they
1409 have, figure out why and see if a job has completed */
1410 static int checkjobs(struct pipe* fg_pipe)
1411 {
1412 int attributes;
1413 int status;
1414 int prognum = 0;
1415 struct pipe *pi;
1416 pid_t childpid;
1417
1418 attributes = WUNTRACED;
1419 if (fg_pipe==NULL) {
1420 attributes |= WNOHANG;
1421 }
1422
1423 while ((childpid = waitpid(-1, &status, attributes)) > 0) {
1424 if (fg_pipe) {
1425 int i, rcode = 0;
1426 for (i=0; i < fg_pipe->num_progs; i++) {
1427 if (fg_pipe->progs[i].pid == childpid) {
1428 if (i==fg_pipe->num_progs-1)
1429 rcode=WEXITSTATUS(status);
1430 (fg_pipe->num_progs)--;
1431 return(rcode);
1432 }
1433 }
1434 }
1435
1436 for (pi = job_list; pi; pi = pi->next) {
1437 prognum = 0;
1438 while (prognum < pi->num_progs && pi->progs[prognum].pid != childpid) {
1439 prognum++;
1440 }
1441 if (prognum < pi->num_progs)
1442 break;
1443 }
1444
1445 if(pi==NULL) {
1446 debug_printf("checkjobs: pid %d was not in our list!\n", childpid);
1447 continue;
1448 }
1449
1450 if (WIFEXITED(status) || WIFSIGNALED(status)) {
1451 /* child exited */
1452 pi->running_progs--;
1453 pi->progs[prognum].pid = 0;
1454
1455 if (!pi->running_progs) {
1456 printf(JOB_STATUS_FORMAT, pi->jobid, "Done", pi->text);
1457 remove_bg_job(pi);
1458 }
1459 } else {
1460 /* child stopped */
1461 pi->stopped_progs++;
1462 pi->progs[prognum].is_stopped = 1;
1463
1464 #if 0
1465 /* Printing this stuff is a pain, since it tends to
1466 * overwrite the prompt an inconveinient moments. So
1467 * don't do that. */
1468 if (pi->stopped_progs == pi->num_progs) {
1469 printf("\n"JOB_STATUS_FORMAT, pi->jobid, "Stopped", pi->text);
1470 }
1471 #endif
1472 }
1473 }
1474
1475 if (childpid == -1 && errno != ECHILD)
1476 perror_msg("waitpid");
1477
1478 /* move the shell to the foreground */
1479 /*if (interactive && tcsetpgrp(shell_terminal, getpgid(0))) */
1480 /* perror_msg("tcsetpgrp-2"); */
1481 return -1;
1482 }
1483
1484 /* Figure out our controlling tty, checking in order stderr,
1485 * stdin, and stdout. If check_pgrp is set, also check that
1486 * we belong to the foreground process group associated with
1487 * that tty. The value of shell_terminal is needed in order to call
1488 * tcsetpgrp(shell_terminal, ...); */
1489 void controlling_tty(int check_pgrp)
1490 {
1491 pid_t curpgrp;
1492
1493 if ((curpgrp = tcgetpgrp(shell_terminal = 2)) < 0
1494 && (curpgrp = tcgetpgrp(shell_terminal = 0)) < 0
1495 && (curpgrp = tcgetpgrp(shell_terminal = 1)) < 0)
1496 goto shell_terminal_error;
1497
1498 if (check_pgrp && curpgrp != getpgid(0))
1499 goto shell_terminal_error;
1500
1501 return;
1502
1503 shell_terminal_error:
1504 shell_terminal = -1;
1505 return;
1506 }
1507 #endif
1508
1509 /* run_pipe_real() starts all the jobs, but doesn't wait for anything
1510 * to finish. See checkjobs().
1511 *
1512 * return code is normally -1, when the caller has to wait for children
1513 * to finish to determine the exit status of the pipe. If the pipe
1514 * is a simple builtin command, however, the action is done by the
1515 * time run_pipe_real returns, and the exit code is provided as the
1516 * return value.
1517 *
1518 * The input of the pipe is always stdin, the output is always
1519 * stdout. The outpipe[] mechanism in BusyBox-0.48 lash is bogus,
1520 * because it tries to avoid running the command substitution in
1521 * subshell, when that is in fact necessary. The subshell process
1522 * now has its stdout directed to the input of the appropriate pipe,
1523 * so this routine is noticeably simpler.
1524 */
1525 static int run_pipe_real(struct pipe *pi)
1526 {
1527 int i;
1528 #ifndef __U_BOOT__
1529 int nextin, nextout;
1530 int pipefds[2]; /* pipefds[0] is for reading */
1531 struct child_prog *child;
1532 struct built_in_command *x;
1533 char *p;
1534 # if __GNUC__
1535 /* Avoid longjmp clobbering */
1536 (void) &i;
1537 (void) &nextin;
1538 (void) &nextout;
1539 (void) &child;
1540 # endif
1541 #else
1542 int nextin;
1543 int flag = do_repeat ? CMD_FLAG_REPEAT : 0;
1544 struct child_prog *child;
1545 char *p;
1546 # if __GNUC__
1547 /* Avoid longjmp clobbering */
1548 (void) &i;
1549 (void) &nextin;
1550 (void) &child;
1551 # endif
1552 #endif /* __U_BOOT__ */
1553
1554 nextin = 0;
1555 #ifndef __U_BOOT__
1556 pi->pgrp = -1;
1557 #endif
1558
1559 /* Check if this is a simple builtin (not part of a pipe).
1560 * Builtins within pipes have to fork anyway, and are handled in
1561 * pseudo_exec. "echo foo | read bar" doesn't work on bash, either.
1562 */
1563 if (pi->num_progs == 1) child = & (pi->progs[0]);
1564 #ifndef __U_BOOT__
1565 if (pi->num_progs == 1 && child->group && child->subshell == 0) {
1566 int squirrel[] = {-1, -1, -1};
1567 int rcode;
1568 debug_printf("non-subshell grouping\n");
1569 setup_redirects(child, squirrel);
1570 /* XXX could we merge code with following builtin case,
1571 * by creating a pseudo builtin that calls run_list_real? */
1572 rcode = run_list_real(child->group);
1573 restore_redirects(squirrel);
1574 #else
1575 if (pi->num_progs == 1 && child->group) {
1576 int rcode;
1577 debug_printf("non-subshell grouping\n");
1578 rcode = run_list_real(child->group);
1579 #endif
1580 return rcode;
1581 } else if (pi->num_progs == 1 && pi->progs[0].argv != NULL) {
1582 for (i=0; is_assignment(child->argv[i]); i++) { /* nothing */ }
1583 if (i!=0 && child->argv[i]==NULL) {
1584 /* assignments, but no command: set the local environment */
1585 for (i=0; child->argv[i]!=NULL; i++) {
1586
1587 /* Ok, this case is tricky. We have to decide if this is a
1588 * local variable, or an already exported variable. If it is
1589 * already exported, we have to export the new value. If it is
1590 * not exported, we need only set this as a local variable.
1591 * This junk is all to decide whether or not to export this
1592 * variable. */
1593 int export_me=0;
1594 char *name, *value;
1595 name = xstrdup(child->argv[i]);
1596 debug_printf("Local environment set: %s\n", name);
1597 value = strchr(name, '=');
1598 if (value)
1599 *value=0;
1600 #ifndef __U_BOOT__
1601 if ( get_local_var(name)) {
1602 export_me=1;
1603 }
1604 #endif
1605 free(name);
1606 p = insert_var_value(child->argv[i]);
1607 set_local_var(p, export_me);
1608 if (p != child->argv[i]) free(p);
1609 }
1610 return EXIT_SUCCESS; /* don't worry about errors in set_local_var() yet */
1611 }
1612 for (i = 0; is_assignment(child->argv[i]); i++) {
1613 p = insert_var_value(child->argv[i]);
1614 #ifndef __U_BOOT__
1615 putenv(strdup(p));
1616 #else
1617 set_local_var(p, 0);
1618 #endif
1619 if (p != child->argv[i]) {
1620 child->sp--;
1621 free(p);
1622 }
1623 }
1624 if (child->sp) {
1625 char * str = NULL;
1626
1627 str = make_string((child->argv + i));
1628 parse_string_outer(str, FLAG_EXIT_FROM_LOOP | FLAG_REPARSING);
1629 free(str);
1630 return last_return_code;
1631 }
1632 #ifndef __U_BOOT__
1633 for (x = bltins; x->cmd; x++) {
1634 if (strcmp(child->argv[i], x->cmd) == 0 ) {
1635 int squirrel[] = {-1, -1, -1};
1636 int rcode;
1637 if (x->function == builtin_exec && child->argv[i+1]==NULL) {
1638 debug_printf("magic exec\n");
1639 setup_redirects(child,NULL);
1640 return EXIT_SUCCESS;
1641 }
1642 debug_printf("builtin inline %s\n", child->argv[0]);
1643 /* XXX setup_redirects acts on file descriptors, not FILEs.
1644 * This is perfect for work that comes after exec().
1645 * Is it really safe for inline use? Experimentally,
1646 * things seem to work with glibc. */
1647 setup_redirects(child, squirrel);
1648
1649 child->argv += i; /* XXX horrible hack */
1650 rcode = x->function(child);
1651 /* XXX restore hack so free() can work right */
1652 child->argv -= i;
1653 restore_redirects(squirrel);
1654 }
1655 return rcode;
1656 }
1657 #else
1658 /* check ";", because ,example , argv consist from
1659 * "help;flinfo" must not execute
1660 */
1661 if (strchr(child->argv[i], ';')) {
1662 printf("Unknown command '%s' - try 'help' or use "
1663 "'run' command\n", child->argv[i]);
1664 return -1;
1665 }
1666 /* Process the command */
1667 return cmd_process(flag, child->argc, child->argv,
1668 &flag_repeat);
1669 #endif
1670 }
1671 #ifndef __U_BOOT__
1672
1673 for (i = 0; i < pi->num_progs; i++) {
1674 child = & (pi->progs[i]);
1675
1676 /* pipes are inserted between pairs of commands */
1677 if ((i + 1) < pi->num_progs) {
1678 if (pipe(pipefds)<0) perror_msg_and_die("pipe");
1679 nextout = pipefds[1];
1680 } else {
1681 nextout=1;
1682 pipefds[0] = -1;
1683 }
1684
1685 /* XXX test for failed fork()? */
1686 if (!(child->pid = fork())) {
1687 /* Set the handling for job control signals back to the default. */
1688 signal(SIGINT, SIG_DFL);
1689 signal(SIGQUIT, SIG_DFL);
1690 signal(SIGTERM, SIG_DFL);
1691 signal(SIGTSTP, SIG_DFL);
1692 signal(SIGTTIN, SIG_DFL);
1693 signal(SIGTTOU, SIG_DFL);
1694 signal(SIGCHLD, SIG_DFL);
1695
1696 close_all();
1697
1698 if (nextin != 0) {
1699 dup2(nextin, 0);
1700 close(nextin);
1701 }
1702 if (nextout != 1) {
1703 dup2(nextout, 1);
1704 close(nextout);
1705 }
1706 if (pipefds[0]!=-1) {
1707 close(pipefds[0]); /* opposite end of our output pipe */
1708 }
1709
1710 /* Like bash, explicit redirects override pipes,
1711 * and the pipe fd is available for dup'ing. */
1712 setup_redirects(child,NULL);
1713
1714 if (interactive && pi->followup!=PIPE_BG) {
1715 /* If we (the child) win the race, put ourselves in the process
1716 * group whose leader is the first process in this pipe. */
1717 if (pi->pgrp < 0) {
1718 pi->pgrp = getpid();
1719 }
1720 if (setpgid(0, pi->pgrp) == 0) {
1721 tcsetpgrp(2, pi->pgrp);
1722 }
1723 }
1724
1725 pseudo_exec(child);
1726 }
1727
1728
1729 /* put our child in the process group whose leader is the
1730 first process in this pipe */
1731 if (pi->pgrp < 0) {
1732 pi->pgrp = child->pid;
1733 }
1734 /* Don't check for errors. The child may be dead already,
1735 * in which case setpgid returns error code EACCES. */
1736 setpgid(child->pid, pi->pgrp);
1737
1738 if (nextin != 0)
1739 close(nextin);
1740 if (nextout != 1)
1741 close(nextout);
1742
1743 /* If there isn't another process, nextin is garbage
1744 but it doesn't matter */
1745 nextin = pipefds[0];
1746 }
1747 #endif
1748 return -1;
1749 }
1750
1751 static int run_list_real(struct pipe *pi)
1752 {
1753 char *save_name = NULL;
1754 char **list = NULL;
1755 char **save_list = NULL;
1756 struct pipe *rpipe;
1757 int flag_rep = 0;
1758 #ifndef __U_BOOT__
1759 int save_num_progs;
1760 #endif
1761 int rcode=0, flag_skip=1;
1762 int flag_restore = 0;
1763 int if_code=0, next_if_code=0; /* need double-buffer to handle elif */
1764 reserved_style rmode, skip_more_in_this_rmode=RES_XXXX;
1765 /* check syntax for "for" */
1766 for (rpipe = pi; rpipe; rpipe = rpipe->next) {
1767 if ((rpipe->r_mode == RES_IN ||
1768 rpipe->r_mode == RES_FOR) &&
1769 (rpipe->next == NULL)) {
1770 syntax();
1771 #ifdef __U_BOOT__
1772 flag_repeat = 0;
1773 #endif
1774 return 1;
1775 }
1776 if ((rpipe->r_mode == RES_IN &&
1777 (rpipe->next->r_mode == RES_IN &&
1778 rpipe->next->progs->argv != NULL))||
1779 (rpipe->r_mode == RES_FOR &&
1780 rpipe->next->r_mode != RES_IN)) {
1781 syntax();
1782 #ifdef __U_BOOT__
1783 flag_repeat = 0;
1784 #endif
1785 return 1;
1786 }
1787 }
1788 for (; pi; pi = (flag_restore != 0) ? rpipe : pi->next) {
1789 if (pi->r_mode == RES_WHILE || pi->r_mode == RES_UNTIL ||
1790 pi->r_mode == RES_FOR) {
1791 #ifdef __U_BOOT__
1792 /* check Ctrl-C */
1793 ctrlc();
1794 if ((had_ctrlc())) {
1795 return 1;
1796 }
1797 #endif
1798 flag_restore = 0;
1799 if (!rpipe) {
1800 flag_rep = 0;
1801 rpipe = pi;
1802 }
1803 }
1804 rmode = pi->r_mode;
1805 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);
1806 if (rmode == skip_more_in_this_rmode && flag_skip) {
1807 if (pi->followup == PIPE_SEQ) flag_skip=0;
1808 continue;
1809 }
1810 flag_skip = 1;
1811 skip_more_in_this_rmode = RES_XXXX;
1812 if (rmode == RES_THEN || rmode == RES_ELSE) if_code = next_if_code;
1813 if (rmode == RES_THEN && if_code) continue;
1814 if (rmode == RES_ELSE && !if_code) continue;
1815 if (rmode == RES_ELIF && !if_code) break;
1816 if (rmode == RES_FOR && pi->num_progs) {
1817 if (!list) {
1818 /* if no variable values after "in" we skip "for" */
1819 if (!pi->next->progs->argv) continue;
1820 /* create list of variable values */
1821 list = make_list_in(pi->next->progs->argv,
1822 pi->progs->argv[0]);
1823 save_list = list;
1824 save_name = pi->progs->argv[0];
1825 pi->progs->argv[0] = NULL;
1826 flag_rep = 1;
1827 }
1828 if (!(*list)) {
1829 free(pi->progs->argv[0]);
1830 free(save_list);
1831 list = NULL;
1832 flag_rep = 0;
1833 pi->progs->argv[0] = save_name;
1834 #ifndef __U_BOOT__
1835 pi->progs->glob_result.gl_pathv[0] =
1836 pi->progs->argv[0];
1837 #endif
1838 continue;
1839 } else {
1840 /* insert new value from list for variable */
1841 if (pi->progs->argv[0])
1842 free(pi->progs->argv[0]);
1843 pi->progs->argv[0] = *list++;
1844 #ifndef __U_BOOT__
1845 pi->progs->glob_result.gl_pathv[0] =
1846 pi->progs->argv[0];
1847 #endif
1848 }
1849 }
1850 if (rmode == RES_IN) continue;
1851 if (rmode == RES_DO) {
1852 if (!flag_rep) continue;
1853 }
1854 if ((rmode == RES_DONE)) {
1855 if (flag_rep) {
1856 flag_restore = 1;
1857 } else {
1858 rpipe = NULL;
1859 }
1860 }
1861 if (pi->num_progs == 0) continue;
1862 #ifndef __U_BOOT__
1863 save_num_progs = pi->num_progs; /* save number of programs */
1864 #endif
1865 rcode = run_pipe_real(pi);
1866 debug_printf("run_pipe_real returned %d\n",rcode);
1867 #ifndef __U_BOOT__
1868 if (rcode!=-1) {
1869 /* We only ran a builtin: rcode was set by the return value
1870 * of run_pipe_real(), and we don't need to wait for anything. */
1871 } else if (pi->followup==PIPE_BG) {
1872 /* XXX check bash's behavior with nontrivial pipes */
1873 /* XXX compute jobid */
1874 /* XXX what does bash do with attempts to background builtins? */
1875 insert_bg_job(pi);
1876 rcode = EXIT_SUCCESS;
1877 } else {
1878 if (interactive) {
1879 /* move the new process group into the foreground */
1880 if (tcsetpgrp(shell_terminal, pi->pgrp) && errno != ENOTTY)
1881 perror_msg("tcsetpgrp-3");
1882 rcode = checkjobs(pi);
1883 /* move the shell to the foreground */
1884 if (tcsetpgrp(shell_terminal, getpgid(0)) && errno != ENOTTY)
1885 perror_msg("tcsetpgrp-4");
1886 } else {
1887 rcode = checkjobs(pi);
1888 }
1889 debug_printf("checkjobs returned %d\n",rcode);
1890 }
1891 last_return_code=rcode;
1892 #else
1893 if (rcode < -1) {
1894 last_return_code = -rcode - 2;
1895 return -2; /* exit */
1896 }
1897 last_return_code=(rcode == 0) ? 0 : 1;
1898 #endif
1899 #ifndef __U_BOOT__
1900 pi->num_progs = save_num_progs; /* restore number of programs */
1901 #endif
1902 if ( rmode == RES_IF || rmode == RES_ELIF )
1903 next_if_code=rcode; /* can be overwritten a number of times */
1904 if (rmode == RES_WHILE)
1905 flag_rep = !last_return_code;
1906 if (rmode == RES_UNTIL)
1907 flag_rep = last_return_code;
1908 if ( (rcode==EXIT_SUCCESS && pi->followup==PIPE_OR) ||
1909 (rcode!=EXIT_SUCCESS && pi->followup==PIPE_AND) )
1910 skip_more_in_this_rmode=rmode;
1911 #ifndef __U_BOOT__
1912 checkjobs(NULL);
1913 #endif
1914 }
1915 return rcode;
1916 }
1917
1918 /* broken, of course, but OK for testing */
1919 static char *indenter(int i)
1920 {
1921 static char blanks[]=" ";
1922 return &blanks[sizeof(blanks)-i-1];
1923 }
1924
1925 /* return code is the exit status of the pipe */
1926 static int free_pipe(struct pipe *pi, int indent)
1927 {
1928 char **p;
1929 struct child_prog *child;
1930 #ifndef __U_BOOT__
1931 struct redir_struct *r, *rnext;
1932 #endif
1933 int a, i, ret_code=0;
1934 char *ind = indenter(indent);
1935
1936 #ifndef __U_BOOT__
1937 if (pi->stopped_progs > 0)
1938 return ret_code;
1939 final_printf("%s run pipe: (pid %d)\n",ind,getpid());
1940 #endif
1941 for (i=0; i<pi->num_progs; i++) {
1942 child = &pi->progs[i];
1943 final_printf("%s command %d:\n",ind,i);
1944 if (child->argv) {
1945 for (a=0,p=child->argv; *p; a++,p++) {
1946 final_printf("%s argv[%d] = %s\n",ind,a,*p);
1947 }
1948 #ifndef __U_BOOT__
1949 globfree(&child->glob_result);
1950 #else
1951 for (a = 0; a < child->argc; a++) {
1952 free(child->argv[a]);
1953 }
1954 free(child->argv);
1955 child->argc = 0;
1956 #endif
1957 child->argv=NULL;
1958 } else if (child->group) {
1959 #ifndef __U_BOOT__
1960 final_printf("%s begin group (subshell:%d)\n",ind, child->subshell);
1961 #endif
1962 ret_code = free_pipe_list(child->group,indent+3);
1963 final_printf("%s end group\n",ind);
1964 } else {
1965 final_printf("%s (nil)\n",ind);
1966 }
1967 #ifndef __U_BOOT__
1968 for (r=child->redirects; r; r=rnext) {
1969 final_printf("%s redirect %d%s", ind, r->fd, redir_table[r->type].descrip);
1970 if (r->dup == -1) {
1971 /* guard against the case >$FOO, where foo is unset or blank */
1972 if (r->word.gl_pathv) {
1973 final_printf(" %s\n", *r->word.gl_pathv);
1974 globfree(&r->word);
1975 }
1976 } else {
1977 final_printf("&%d\n", r->dup);
1978 }
1979 rnext=r->next;
1980 free(r);
1981 }
1982 child->redirects=NULL;
1983 #endif
1984 }
1985 free(pi->progs); /* children are an array, they get freed all at once */
1986 pi->progs=NULL;
1987 return ret_code;
1988 }
1989
1990 static int free_pipe_list(struct pipe *head, int indent)
1991 {
1992 int rcode=0; /* if list has no members */
1993 struct pipe *pi, *next;
1994 char *ind = indenter(indent);
1995 for (pi=head; pi; pi=next) {
1996 final_printf("%s pipe reserved mode %d\n", ind, pi->r_mode);
1997 rcode = free_pipe(pi, indent);
1998 final_printf("%s pipe followup code %d\n", ind, pi->followup);
1999 next=pi->next;
2000 pi->next=NULL;
2001 free(pi);
2002 }
2003 return rcode;
2004 }
2005
2006 /* Select which version we will use */
2007 static int run_list(struct pipe *pi)
2008 {
2009 int rcode=0;
2010 #ifndef __U_BOOT__
2011 if (fake_mode==0) {
2012 #endif
2013 rcode = run_list_real(pi);
2014 #ifndef __U_BOOT__
2015 }
2016 #endif
2017 /* free_pipe_list has the side effect of clearing memory
2018 * In the long run that function can be merged with run_list_real,
2019 * but doing that now would hobble the debugging effort. */
2020 free_pipe_list(pi,0);
2021 return rcode;
2022 }
2023
2024 /* The API for glob is arguably broken. This routine pushes a non-matching
2025 * string into the output structure, removing non-backslashed backslashes.
2026 * If someone can prove me wrong, by performing this function within the
2027 * original glob(3) api, feel free to rewrite this routine into oblivion.
2028 * Return code (0 vs. GLOB_NOSPACE) matches glob(3).
2029 * XXX broken if the last character is '\\', check that before calling.
2030 */
2031 #ifndef __U_BOOT__
2032 static int globhack(const char *src, int flags, glob_t *pglob)
2033 {
2034 int cnt=0, pathc;
2035 const char *s;
2036 char *dest;
2037 for (cnt=1, s=src; s && *s; s++) {
2038 if (*s == '\\') s++;
2039 cnt++;
2040 }
2041 dest = malloc(cnt);
2042 if (!dest) return GLOB_NOSPACE;
2043 if (!(flags & GLOB_APPEND)) {
2044 pglob->gl_pathv=NULL;
2045 pglob->gl_pathc=0;
2046 pglob->gl_offs=0;
2047 pglob->gl_offs=0;
2048 }
2049 pathc = ++pglob->gl_pathc;
2050 pglob->gl_pathv = realloc(pglob->gl_pathv, (pathc+1)*sizeof(*pglob->gl_pathv));
2051 if (pglob->gl_pathv == NULL) return GLOB_NOSPACE;
2052 pglob->gl_pathv[pathc-1]=dest;
2053 pglob->gl_pathv[pathc]=NULL;
2054 for (s=src; s && *s; s++, dest++) {
2055 if (*s == '\\') s++;
2056 *dest = *s;
2057 }
2058 *dest='\0';
2059 return 0;
2060 }
2061
2062 /* XXX broken if the last character is '\\', check that before calling */
2063 static int glob_needed(const char *s)
2064 {
2065 for (; *s; s++) {
2066 if (*s == '\\') s++;
2067 if (strchr("*[?",*s)) return 1;
2068 }
2069 return 0;
2070 }
2071
2072 #if 0
2073 static void globprint(glob_t *pglob)
2074 {
2075 int i;
2076 debug_printf("glob_t at %p:\n", pglob);
2077 debug_printf(" gl_pathc=%d gl_pathv=%p gl_offs=%d gl_flags=%d\n",
2078 pglob->gl_pathc, pglob->gl_pathv, pglob->gl_offs, pglob->gl_flags);
2079 for (i=0; i<pglob->gl_pathc; i++)
2080 debug_printf("pglob->gl_pathv[%d] = %p = %s\n", i,
2081 pglob->gl_pathv[i], pglob->gl_pathv[i]);
2082 }
2083 #endif
2084
2085 static int xglob(o_string *dest, int flags, glob_t *pglob)
2086 {
2087 int gr;
2088
2089 /* short-circuit for null word */
2090 /* we can code this better when the debug_printf's are gone */
2091 if (dest->length == 0) {
2092 if (dest->nonnull) {
2093 /* bash man page calls this an "explicit" null */
2094 gr = globhack(dest->data, flags, pglob);
2095 debug_printf("globhack returned %d\n",gr);
2096 } else {
2097 return 0;
2098 }
2099 } else if (glob_needed(dest->data)) {
2100 gr = glob(dest->data, flags, NULL, pglob);
2101 debug_printf("glob returned %d\n",gr);
2102 if (gr == GLOB_NOMATCH) {
2103 /* quote removal, or more accurately, backslash removal */
2104 gr = globhack(dest->data, flags, pglob);
2105 debug_printf("globhack returned %d\n",gr);
2106 }
2107 } else {
2108 gr = globhack(dest->data, flags, pglob);
2109 debug_printf("globhack returned %d\n",gr);
2110 }
2111 if (gr == GLOB_NOSPACE)
2112 error_msg_and_die("out of memory during glob");
2113 if (gr != 0) { /* GLOB_ABORTED ? */
2114 error_msg("glob(3) error %d",gr);
2115 }
2116 /* globprint(glob_target); */
2117 return gr;
2118 }
2119 #endif
2120
2121 #ifdef __U_BOOT__
2122 static char *get_dollar_var(char ch);
2123 #endif
2124
2125 /* This is used to get/check local shell variables */
2126 char *get_local_var(const char *s)
2127 {
2128 struct variables *cur;
2129
2130 if (!s)
2131 return NULL;
2132
2133 #ifdef __U_BOOT__
2134 if (*s == '$')
2135 return get_dollar_var(s[1]);
2136 #endif
2137
2138 for (cur = top_vars; cur; cur=cur->next)
2139 if(strcmp(cur->name, s)==0)
2140 return cur->value;
2141 return NULL;
2142 }
2143
2144 /* This is used to set local shell variables
2145 flg_export==0 if only local (not exporting) variable
2146 flg_export==1 if "new" exporting environ
2147 flg_export>1 if current startup environ (not call putenv()) */
2148 int set_local_var(const char *s, int flg_export)
2149 {
2150 char *name, *value;
2151 int result=0;
2152 struct variables *cur;
2153
2154 #ifdef __U_BOOT__
2155 /* might be possible! */
2156 if (!isalpha(*s))
2157 return -1;
2158 #endif
2159
2160 name=strdup(s);
2161
2162 #ifdef __U_BOOT__
2163 if (getenv(name) != NULL) {
2164 printf ("ERROR: "
2165 "There is a global environment variable with the same name.\n");
2166 free(name);
2167 return -1;
2168 }
2169 #endif
2170 /* Assume when we enter this function that we are already in
2171 * NAME=VALUE format. So the first order of business is to
2172 * split 's' on the '=' into 'name' and 'value' */
2173 value = strchr(name, '=');
2174 if (value == NULL && ++value == NULL) {
2175 free(name);
2176 return -1;
2177 }
2178 *value++ = 0;
2179
2180 for(cur = top_vars; cur; cur = cur->next) {
2181 if(strcmp(cur->name, name)==0)
2182 break;
2183 }
2184
2185 if(cur) {
2186 if(strcmp(cur->value, value)==0) {
2187 if(flg_export>0 && cur->flg_export==0)
2188 cur->flg_export=flg_export;
2189 else
2190 result++;
2191 } else {
2192 if(cur->flg_read_only) {
2193 error_msg("%s: readonly variable", name);
2194 result = -1;
2195 } else {
2196 if(flg_export>0 || cur->flg_export>1)
2197 cur->flg_export=1;
2198 free(cur->value);
2199
2200 cur->value = strdup(value);
2201 }
2202 }
2203 } else {
2204 cur = malloc(sizeof(struct variables));
2205 if(!cur) {
2206 result = -1;
2207 } else {
2208 cur->name = strdup(name);
2209 if (cur->name == NULL) {
2210 free(cur);
2211 result = -1;
2212 } else {
2213 struct variables *bottom = top_vars;
2214 cur->value = strdup(value);
2215 cur->next = NULL;
2216 cur->flg_export = flg_export;
2217 cur->flg_read_only = 0;
2218 while(bottom->next) bottom=bottom->next;
2219 bottom->next = cur;
2220 }
2221 }
2222 }
2223
2224 #ifndef __U_BOOT__
2225 if(result==0 && cur->flg_export==1) {
2226 *(value-1) = '=';
2227 result = putenv(name);
2228 } else {
2229 #endif
2230 free(name);
2231 #ifndef __U_BOOT__
2232 if(result>0) /* equivalent to previous set */
2233 result = 0;
2234 }
2235 #endif
2236 return result;
2237 }
2238
2239 void unset_local_var(const char *name)
2240 {
2241 struct variables *cur;
2242
2243 if (name) {
2244 for (cur = top_vars; cur; cur=cur->next) {
2245 if(strcmp(cur->name, name)==0)
2246 break;
2247 }
2248 if (cur != NULL) {
2249 struct variables *next = top_vars;
2250 if(cur->flg_read_only) {
2251 error_msg("%s: readonly variable", name);
2252 return;
2253 } else {
2254 #ifndef __U_BOOT__
2255 if(cur->flg_export)
2256 unsetenv(cur->name);
2257 #endif
2258 free(cur->name);
2259 free(cur->value);
2260 while (next->next != cur)
2261 next = next->next;
2262 next->next = cur->next;
2263 }
2264 free(cur);
2265 }
2266 }
2267 }
2268
2269 static int is_assignment(const char *s)
2270 {
2271 if (s == NULL)
2272 return 0;
2273
2274 if (!isalpha(*s)) return 0;
2275 ++s;
2276 while(isalnum(*s) || *s=='_') ++s;
2277 return *s=='=';
2278 }
2279
2280 #ifndef __U_BOOT__
2281 /* the src parameter allows us to peek forward to a possible &n syntax
2282 * for file descriptor duplication, e.g., "2>&1".
2283 * Return code is 0 normally, 1 if a syntax error is detected in src.
2284 * Resource errors (in xmalloc) cause the process to exit */
2285 static int setup_redirect(struct p_context *ctx, int fd, redir_type style,
2286 struct in_str *input)
2287 {
2288 struct child_prog *child=ctx->child;
2289 struct redir_struct *redir = child->redirects;
2290 struct redir_struct *last_redir=NULL;
2291
2292 /* Create a new redir_struct and drop it onto the end of the linked list */
2293 while(redir) {
2294 last_redir=redir;
2295 redir=redir->next;
2296 }
2297 redir = xmalloc(sizeof(struct redir_struct));
2298 redir->next=NULL;
2299 redir->word.gl_pathv=NULL;
2300 if (last_redir) {
2301 last_redir->next=redir;
2302 } else {
2303 child->redirects=redir;
2304 }
2305
2306 redir->type=style;
2307 redir->fd= (fd==-1) ? redir_table[style].default_fd : fd ;
2308
2309 debug_printf("Redirect type %d%s\n", redir->fd, redir_table[style].descrip);
2310
2311 /* Check for a '2>&1' type redirect */
2312 redir->dup = redirect_dup_num(input);
2313 if (redir->dup == -2) return 1; /* syntax error */
2314 if (redir->dup != -1) {
2315 /* Erik had a check here that the file descriptor in question
2316 * is legit; I postpone that to "run time"
2317 * A "-" representation of "close me" shows up as a -3 here */
2318 debug_printf("Duplicating redirect '%d>&%d'\n", redir->fd, redir->dup);
2319 } else {
2320 /* We do _not_ try to open the file that src points to,
2321 * since we need to return and let src be expanded first.
2322 * Set ctx->pending_redirect, so we know what to do at the
2323 * end of the next parsed word.
2324 */
2325 ctx->pending_redirect = redir;
2326 }
2327 return 0;
2328 }
2329 #endif
2330
2331 static struct pipe *new_pipe(void)
2332 {
2333 struct pipe *pi;
2334 pi = xmalloc(sizeof(struct pipe));
2335 pi->num_progs = 0;
2336 pi->progs = NULL;
2337 pi->next = NULL;
2338 pi->followup = 0; /* invalid */
2339 pi->r_mode = RES_NONE;
2340 return pi;
2341 }
2342
2343 static void initialize_context(struct p_context *ctx)
2344 {
2345 ctx->pipe=NULL;
2346 #ifndef __U_BOOT__
2347 ctx->pending_redirect=NULL;
2348 #endif
2349 ctx->child=NULL;
2350 ctx->list_head=new_pipe();
2351 ctx->pipe=ctx->list_head;
2352 ctx->w=RES_NONE;
2353 ctx->stack=NULL;
2354 #ifdef __U_BOOT__
2355 ctx->old_flag=0;
2356 #endif
2357 done_command(ctx); /* creates the memory for working child */
2358 }
2359
2360 /* normal return is 0
2361 * if a reserved word is found, and processed, return 1
2362 * should handle if, then, elif, else, fi, for, while, until, do, done.
2363 * case, function, and select are obnoxious, save those for later.
2364 */
2365 struct reserved_combo {
2366 char *literal;
2367 int code;
2368 long flag;
2369 };
2370 /* Mostly a list of accepted follow-up reserved words.
2371 * FLAG_END means we are done with the sequence, and are ready
2372 * to turn the compound list into a command.
2373 * FLAG_START means the word must start a new compound list.
2374 */
2375 static struct reserved_combo reserved_list[] = {
2376 { "if", RES_IF, FLAG_THEN | FLAG_START },
2377 { "then", RES_THEN, FLAG_ELIF | FLAG_ELSE | FLAG_FI },
2378 { "elif", RES_ELIF, FLAG_THEN },
2379 { "else", RES_ELSE, FLAG_FI },
2380 { "fi", RES_FI, FLAG_END },
2381 { "for", RES_FOR, FLAG_IN | FLAG_START },
2382 { "while", RES_WHILE, FLAG_DO | FLAG_START },
2383 { "until", RES_UNTIL, FLAG_DO | FLAG_START },
2384 { "in", RES_IN, FLAG_DO },
2385 { "do", RES_DO, FLAG_DONE },
2386 { "done", RES_DONE, FLAG_END }
2387 };
2388 #define NRES (sizeof(reserved_list)/sizeof(struct reserved_combo))
2389
2390 static int reserved_word(o_string *dest, struct p_context *ctx)
2391 {
2392 struct reserved_combo *r;
2393 for (r=reserved_list;
2394 r<reserved_list+NRES; r++) {
2395 if (strcmp(dest->data, r->literal) == 0) {
2396 debug_printf("found reserved word %s, code %d\n",r->literal,r->code);
2397 if (r->flag & FLAG_START) {
2398 struct p_context *new = xmalloc(sizeof(struct p_context));
2399 debug_printf("push stack\n");
2400 if (ctx->w == RES_IN || ctx->w == RES_FOR) {
2401 syntax();
2402 free(new);
2403 ctx->w = RES_SNTX;
2404 b_reset(dest);
2405 return 1;
2406 }
2407 *new = *ctx; /* physical copy */
2408 initialize_context(ctx);
2409 ctx->stack=new;
2410 } else if ( ctx->w == RES_NONE || ! (ctx->old_flag & (1<<r->code))) {
2411 syntax();
2412 ctx->w = RES_SNTX;
2413 b_reset(dest);
2414 return 1;
2415 }
2416 ctx->w=r->code;
2417 ctx->old_flag = r->flag;
2418 if (ctx->old_flag & FLAG_END) {
2419 struct p_context *old;
2420 debug_printf("pop stack\n");
2421 done_pipe(ctx,PIPE_SEQ);
2422 old = ctx->stack;
2423 old->child->group = ctx->list_head;
2424 #ifndef __U_BOOT__
2425 old->child->subshell = 0;
2426 #endif
2427 *ctx = *old; /* physical copy */
2428 free(old);
2429 }
2430 b_reset (dest);
2431 return 1;
2432 }
2433 }
2434 return 0;
2435 }
2436
2437 /* normal return is 0.
2438 * Syntax or xglob errors return 1. */
2439 static int done_word(o_string *dest, struct p_context *ctx)
2440 {
2441 struct child_prog *child=ctx->child;
2442 #ifndef __U_BOOT__
2443 glob_t *glob_target;
2444 int gr, flags = 0;
2445 #else
2446 char *str, *s;
2447 int argc, cnt;
2448 #endif
2449
2450 debug_printf("done_word: %s %p\n", dest->data, child);
2451 if (dest->length == 0 && !dest->nonnull) {
2452 debug_printf(" true null, ignored\n");
2453 return 0;
2454 }
2455 #ifndef __U_BOOT__
2456 if (ctx->pending_redirect) {
2457 glob_target = &ctx->pending_redirect->word;
2458 } else {
2459 #endif
2460 if (child->group) {
2461 syntax();
2462 return 1; /* syntax error, groups and arglists don't mix */
2463 }
2464 if (!child->argv && (ctx->type & FLAG_PARSE_SEMICOLON)) {
2465 debug_printf("checking %s for reserved-ness\n",dest->data);
2466 if (reserved_word(dest,ctx)) return ctx->w==RES_SNTX;
2467 }
2468 #ifndef __U_BOOT__
2469 glob_target = &child->glob_result;
2470 if (child->argv) flags |= GLOB_APPEND;
2471 #else
2472 for (cnt = 1, s = dest->data; s && *s; s++) {
2473 if (*s == '\\') s++;
2474 cnt++;
2475 }
2476 str = malloc(cnt);
2477 if (!str) return 1;
2478 if ( child->argv == NULL) {
2479 child->argc=0;
2480 }
2481 argc = ++child->argc;
2482 child->argv = realloc(child->argv, (argc+1)*sizeof(*child->argv));
2483 if (child->argv == NULL) return 1;
2484 child->argv[argc-1]=str;
2485 child->argv[argc]=NULL;
2486 for (s = dest->data; s && *s; s++,str++) {
2487 if (*s == '\\') s++;
2488 *str = *s;
2489 }
2490 *str = '\0';
2491 #endif
2492 #ifndef __U_BOOT__
2493 }
2494 gr = xglob(dest, flags, glob_target);
2495 if (gr != 0) return 1;
2496 #endif
2497
2498 b_reset(dest);
2499 #ifndef __U_BOOT__
2500 if (ctx->pending_redirect) {
2501 ctx->pending_redirect=NULL;
2502 if (glob_target->gl_pathc != 1) {
2503 error_msg("ambiguous redirect");
2504 return 1;
2505 }
2506 } else {
2507 child->argv = glob_target->gl_pathv;
2508 }
2509 #endif
2510 if (ctx->w == RES_FOR) {
2511 done_word(dest,ctx);
2512 done_pipe(ctx,PIPE_SEQ);
2513 }
2514 return 0;
2515 }
2516
2517 /* The only possible error here is out of memory, in which case
2518 * xmalloc exits. */
2519 static int done_command(struct p_context *ctx)
2520 {
2521 /* The child is really already in the pipe structure, so
2522 * advance the pipe counter and make a new, null child.
2523 * Only real trickiness here is that the uncommitted
2524 * child structure, to which ctx->child points, is not
2525 * counted in pi->num_progs. */
2526 struct pipe *pi=ctx->pipe;
2527 struct child_prog *prog=ctx->child;
2528
2529 if (prog && prog->group == NULL
2530 && prog->argv == NULL
2531 #ifndef __U_BOOT__
2532 && prog->redirects == NULL) {
2533 #else
2534 ) {
2535 #endif
2536 debug_printf("done_command: skipping null command\n");
2537 return 0;
2538 } else if (prog) {
2539 pi->num_progs++;
2540 debug_printf("done_command: num_progs incremented to %d\n",pi->num_progs);
2541 } else {
2542 debug_printf("done_command: initializing\n");
2543 }
2544 pi->progs = xrealloc(pi->progs, sizeof(*pi->progs) * (pi->num_progs+1));
2545
2546 prog = pi->progs + pi->num_progs;
2547 #ifndef __U_BOOT__
2548 prog->redirects = NULL;
2549 #endif
2550 prog->argv = NULL;
2551 #ifndef __U_BOOT__
2552 prog->is_stopped = 0;
2553 #endif
2554 prog->group = NULL;
2555 #ifndef __U_BOOT__
2556 prog->glob_result.gl_pathv = NULL;
2557 prog->family = pi;
2558 #endif
2559 prog->sp = 0;
2560 ctx->child = prog;
2561 prog->type = ctx->type;
2562
2563 /* but ctx->pipe and ctx->list_head remain unchanged */
2564 return 0;
2565 }
2566
2567 static int done_pipe(struct p_context *ctx, pipe_style type)
2568 {
2569 struct pipe *new_p;
2570 done_command(ctx); /* implicit closure of previous command */
2571 debug_printf("done_pipe, type %d\n", type);
2572 ctx->pipe->followup = type;
2573 ctx->pipe->r_mode = ctx->w;
2574 new_p=new_pipe();
2575 ctx->pipe->next = new_p;
2576 ctx->pipe = new_p;
2577 ctx->child = NULL;
2578 done_command(ctx); /* set up new pipe to accept commands */
2579 return 0;
2580 }
2581
2582 #ifndef __U_BOOT__
2583 /* peek ahead in the in_str to find out if we have a "&n" construct,
2584 * as in "2>&1", that represents duplicating a file descriptor.
2585 * returns either -2 (syntax error), -1 (no &), or the number found.
2586 */
2587 static int redirect_dup_num(struct in_str *input)
2588 {
2589 int ch, d=0, ok=0;
2590 ch = b_peek(input);
2591 if (ch != '&') return -1;
2592
2593 b_getch(input); /* get the & */
2594 ch=b_peek(input);
2595 if (ch == '-') {
2596 b_getch(input);
2597 return -3; /* "-" represents "close me" */
2598 }
2599 while (isdigit(ch)) {
2600 d = d*10+(ch-'0');
2601 ok=1;
2602 b_getch(input);
2603 ch = b_peek(input);
2604 }
2605 if (ok) return d;
2606
2607 error_msg("ambiguous redirect");
2608 return -2;
2609 }
2610
2611 /* If a redirect is immediately preceded by a number, that number is
2612 * supposed to tell which file descriptor to redirect. This routine
2613 * looks for such preceding numbers. In an ideal world this routine
2614 * needs to handle all the following classes of redirects...
2615 * echo 2>foo # redirects fd 2 to file "foo", nothing passed to echo
2616 * echo 49>foo # redirects fd 49 to file "foo", nothing passed to echo
2617 * echo -2>foo # redirects fd 1 to file "foo", "-2" passed to echo
2618 * echo 49x>foo # redirects fd 1 to file "foo", "49x" passed to echo
2619 * A -1 output from this program means no valid number was found, so the
2620 * caller should use the appropriate default for this redirection.
2621 */
2622 static int redirect_opt_num(o_string *o)
2623 {
2624 int num;
2625
2626 if (o->length==0) return -1;
2627 for(num=0; num<o->length; num++) {
2628 if (!isdigit(*(o->data+num))) {
2629 return -1;
2630 }
2631 }
2632 /* reuse num (and save an int) */
2633 num=atoi(o->data);
2634 b_reset(o);
2635 return num;
2636 }
2637
2638 FILE *generate_stream_from_list(struct pipe *head)
2639 {
2640 FILE *pf;
2641 #if 1
2642 int pid, channel[2];
2643 if (pipe(channel)<0) perror_msg_and_die("pipe");
2644 pid=fork();
2645 if (pid<0) {
2646 perror_msg_and_die("fork");
2647 } else if (pid==0) {
2648 close(channel[0]);
2649 if (channel[1] != 1) {
2650 dup2(channel[1],1);
2651 close(channel[1]);
2652 }
2653 #if 0
2654 #define SURROGATE "surrogate response"
2655 write(1,SURROGATE,sizeof(SURROGATE));
2656 _exit(run_list(head));
2657 #else
2658 _exit(run_list_real(head)); /* leaks memory */
2659 #endif
2660 }
2661 debug_printf("forked child %d\n",pid);
2662 close(channel[1]);
2663 pf = fdopen(channel[0],"r");
2664 debug_printf("pipe on FILE *%p\n",pf);
2665 #else
2666 free_pipe_list(head,0);
2667 pf=popen("echo surrogate response","r");
2668 debug_printf("started fake pipe on FILE *%p\n",pf);
2669 #endif
2670 return pf;
2671 }
2672
2673 /* this version hacked for testing purposes */
2674 /* return code is exit status of the process that is run. */
2675 static int process_command_subs(o_string *dest, struct p_context *ctx, struct in_str *input, int subst_end)
2676 {
2677 int retcode;
2678 o_string result=NULL_O_STRING;
2679 struct p_context inner;
2680 FILE *p;
2681 struct in_str pipe_str;
2682 initialize_context(&inner);
2683
2684 /* recursion to generate command */
2685 retcode = parse_stream(&result, &inner, input, subst_end);
2686 if (retcode != 0) return retcode; /* syntax error or EOF */
2687 done_word(&result, &inner);
2688 done_pipe(&inner, PIPE_SEQ);
2689 b_free(&result);
2690
2691 p=generate_stream_from_list(inner.list_head);
2692 if (p==NULL) return 1;
2693 mark_open(fileno(p));
2694 setup_file_in_str(&pipe_str, p);
2695
2696 /* now send results of command back into original context */
2697 retcode = parse_stream(dest, ctx, &pipe_str, '\0');
2698 /* XXX In case of a syntax error, should we try to kill the child?
2699 * That would be tough to do right, so just read until EOF. */
2700 if (retcode == 1) {
2701 while (b_getch(&pipe_str)!=EOF) { /* discard */ };
2702 }
2703
2704 debug_printf("done reading from pipe, pclose()ing\n");
2705 /* This is the step that wait()s for the child. Should be pretty
2706 * safe, since we just read an EOF from its stdout. We could try
2707 * to better, by using wait(), and keeping track of background jobs
2708 * at the same time. That would be a lot of work, and contrary
2709 * to the KISS philosophy of this program. */
2710 mark_closed(fileno(p));
2711 retcode=pclose(p);
2712 free_pipe_list(inner.list_head,0);
2713 debug_printf("pclosed, retcode=%d\n",retcode);
2714 /* XXX this process fails to trim a single trailing newline */
2715 return retcode;
2716 }
2717
2718 static int parse_group(o_string *dest, struct p_context *ctx,
2719 struct in_str *input, int ch)
2720 {
2721 int rcode, endch=0;
2722 struct p_context sub;
2723 struct child_prog *child = ctx->child;
2724 if (child->argv) {
2725 syntax();
2726 return 1; /* syntax error, groups and arglists don't mix */
2727 }
2728 initialize_context(&sub);
2729 switch(ch) {
2730 case '(': endch=')'; child->subshell=1; break;
2731 case '{': endch='}'; break;
2732 default: syntax(); /* really logic error */
2733 }
2734 rcode=parse_stream(dest,&sub,input,endch);
2735 done_word(dest,&sub); /* finish off the final word in the subcontext */
2736 done_pipe(&sub, PIPE_SEQ); /* and the final command there, too */
2737 child->group = sub.list_head;
2738 return rcode;
2739 /* child remains "open", available for possible redirects */
2740 }
2741 #endif
2742
2743 /* basically useful version until someone wants to get fancier,
2744 * see the bash man page under "Parameter Expansion" */
2745 static char *lookup_param(char *src)
2746 {
2747 char *p;
2748 char *sep;
2749 char *default_val = NULL;
2750 int assign = 0;
2751 int expand_empty = 0;
2752
2753 if (!src)
2754 return NULL;
2755
2756 sep = strchr(src, ':');
2757
2758 if (sep) {
2759 *sep = '\0';
2760 if (*(sep + 1) == '-')
2761 default_val = sep+2;
2762 if (*(sep + 1) == '=') {
2763 default_val = sep+2;
2764 assign = 1;
2765 }
2766 if (*(sep + 1) == '+') {
2767 default_val = sep+2;
2768 expand_empty = 1;
2769 }
2770 }
2771
2772 p = getenv(src);
2773 if (!p)
2774 p = get_local_var(src);
2775
2776 if (!p || strlen(p) == 0) {
2777 p = default_val;
2778 if (assign) {
2779 char *var = malloc(strlen(src)+strlen(default_val)+2);
2780 if (var) {
2781 sprintf(var, "%s=%s", src, default_val);
2782 set_local_var(var, 0);
2783 }
2784 free(var);
2785 }
2786 } else if (expand_empty) {
2787 p += strlen(p);
2788 }
2789
2790 if (sep)
2791 *sep = ':';
2792
2793 return p;
2794 }
2795
2796 #ifdef __U_BOOT__
2797 static char *get_dollar_var(char ch)
2798 {
2799 static char buf[40];
2800
2801 buf[0] = '\0';
2802 switch (ch) {
2803 case '?':
2804 sprintf(buf, "%u", (unsigned int)last_return_code);
2805 break;
2806 default:
2807 return NULL;
2808 }
2809 return buf;
2810 }
2811 #endif
2812
2813 /* return code: 0 for OK, 1 for syntax error */
2814 static int handle_dollar(o_string *dest, struct p_context *ctx, struct in_str *input)
2815 {
2816 #ifndef __U_BOOT__
2817 int i, advance=0;
2818 #else
2819 int advance=0;
2820 #endif
2821 #ifndef __U_BOOT__
2822 char sep[]=" ";
2823 #endif
2824 int ch = input->peek(input); /* first character after the $ */
2825 debug_printf("handle_dollar: ch=%c\n",ch);
2826 if (isalpha(ch)) {
2827 b_addchr(dest, SPECIAL_VAR_SYMBOL);
2828 ctx->child->sp++;
2829 while(ch=b_peek(input),isalnum(ch) || ch=='_') {
2830 b_getch(input);
2831 b_addchr(dest,ch);
2832 }
2833 b_addchr(dest, SPECIAL_VAR_SYMBOL);
2834 #ifndef __U_BOOT__
2835 } else if (isdigit(ch)) {
2836 i = ch-'0'; /* XXX is $0 special? */
2837 if (i<global_argc) {
2838 parse_string(dest, ctx, global_argv[i]); /* recursion */
2839 }
2840 advance = 1;
2841 #endif
2842 } else switch (ch) {
2843 #ifndef __U_BOOT__
2844 case '$':
2845 b_adduint(dest,getpid());
2846 advance = 1;
2847 break;
2848 case '!':
2849 if (last_bg_pid > 0) b_adduint(dest, last_bg_pid);
2850 advance = 1;
2851 break;
2852 #endif
2853 case '?':
2854 #ifndef __U_BOOT__
2855 b_adduint(dest,last_return_code);
2856 #else
2857 ctx->child->sp++;
2858 b_addchr(dest, SPECIAL_VAR_SYMBOL);
2859 b_addchr(dest, '$');
2860 b_addchr(dest, '?');
2861 b_addchr(dest, SPECIAL_VAR_SYMBOL);
2862 #endif
2863 advance = 1;
2864 break;
2865 #ifndef __U_BOOT__
2866 case '#':
2867 b_adduint(dest,global_argc ? global_argc-1 : 0);
2868 advance = 1;
2869 break;
2870 #endif
2871 case '{':
2872 b_addchr(dest, SPECIAL_VAR_SYMBOL);
2873 ctx->child->sp++;
2874 b_getch(input);
2875 /* XXX maybe someone will try to escape the '}' */
2876 while(ch=b_getch(input),ch!=EOF && ch!='}') {
2877 b_addchr(dest,ch);
2878 }
2879 if (ch != '}') {
2880 syntax();
2881 return 1;
2882 }
2883 b_addchr(dest, SPECIAL_VAR_SYMBOL);
2884 break;
2885 #ifndef __U_BOOT__
2886 case '(':
2887 b_getch(input);
2888 process_command_subs(dest, ctx, input, ')');
2889 break;
2890 case '*':
2891 sep[0]=ifs[0];
2892 for (i=1; i<global_argc; i++) {
2893 parse_string(dest, ctx, global_argv[i]);
2894 if (i+1 < global_argc) parse_string(dest, ctx, sep);
2895 }
2896 break;
2897 case '@':
2898 case '-':
2899 case '_':
2900 /* still unhandled, but should be eventually */
2901 error_msg("unhandled syntax: $%c",ch);
2902 return 1;
2903 break;
2904 #endif
2905 default:
2906 b_addqchr(dest,'$',dest->quote);
2907 }
2908 /* Eat the character if the flag was set. If the compiler
2909 * is smart enough, we could substitute "b_getch(input);"
2910 * for all the "advance = 1;" above, and also end up with
2911 * a nice size-optimized program. Hah! That'll be the day.
2912 */
2913 if (advance) b_getch(input);
2914 return 0;
2915 }
2916
2917 #ifndef __U_BOOT__
2918 int parse_string(o_string *dest, struct p_context *ctx, const char *src)
2919 {
2920 struct in_str foo;
2921 setup_string_in_str(&foo, src);
2922 return parse_stream(dest, ctx, &foo, '\0');
2923 }
2924 #endif
2925
2926 /* return code is 0 for normal exit, 1 for syntax error */
2927 static int parse_stream(o_string *dest, struct p_context *ctx,
2928 struct in_str *input, int end_trigger)
2929 {
2930 unsigned int ch, m;
2931 #ifndef __U_BOOT__
2932 int redir_fd;
2933 redir_type redir_style;
2934 #endif
2935 int next;
2936
2937 /* Only double-quote state is handled in the state variable dest->quote.
2938 * A single-quote triggers a bypass of the main loop until its mate is
2939 * found. When recursing, quote state is passed in via dest->quote. */
2940
2941 debug_printf("parse_stream, end_trigger=%d\n",end_trigger);
2942 while ((ch=b_getch(input))!=EOF) {
2943 m = map[ch];
2944 #ifdef __U_BOOT__
2945 if (input->__promptme == 0) return 1;
2946 #endif
2947 next = (ch == '\n') ? 0 : b_peek(input);
2948
2949 debug_printf("parse_stream: ch=%c (%d) m=%d quote=%d - %c\n",
2950 ch >= ' ' ? ch : '.', ch, m,
2951 dest->quote, ctx->stack == NULL ? '*' : '.');
2952
2953 if (m==0 || ((m==1 || m==2) && dest->quote)) {
2954 b_addqchr(dest, ch, dest->quote);
2955 } else {
2956 if (m==2) { /* unquoted IFS */
2957 if (done_word(dest, ctx)) {
2958 return 1;
2959 }
2960 /* If we aren't performing a substitution, treat a newline as a
2961 * command separator. */
2962 if (end_trigger != '\0' && ch=='\n')
2963 done_pipe(ctx,PIPE_SEQ);
2964 }
2965 if (ch == end_trigger && !dest->quote && ctx->w==RES_NONE) {
2966 debug_printf("leaving parse_stream (triggered)\n");
2967 return 0;
2968 }
2969 #if 0
2970 if (ch=='\n') {
2971 /* Yahoo! Time to run with it! */
2972 done_pipe(ctx,PIPE_SEQ);
2973 run_list(ctx->list_head);
2974 initialize_context(ctx);
2975 }
2976 #endif
2977 if (m!=2) switch (ch) {
2978 case '#':
2979 if (dest->length == 0 && !dest->quote) {
2980 while(ch=b_peek(input),ch!=EOF && ch!='\n') { b_getch(input); }
2981 } else {
2982 b_addqchr(dest, ch, dest->quote);
2983 }
2984 break;
2985 case '\\':
2986 if (next == EOF) {
2987 syntax();
2988 return 1;
2989 }
2990 b_addqchr(dest, '\\', dest->quote);
2991 b_addqchr(dest, b_getch(input), dest->quote);
2992 break;
2993 case '$':
2994 if (handle_dollar(dest, ctx, input)!=0) return 1;
2995 break;
2996 case '\'':
2997 dest->nonnull = 1;
2998 while(ch=b_getch(input),ch!=EOF && ch!='\'') {
2999 #ifdef __U_BOOT__
3000 if(input->__promptme == 0) return 1;
3001 #endif
3002 b_addchr(dest,ch);
3003 }
3004 if (ch==EOF) {
3005 syntax();
3006 return 1;
3007 }
3008 break;
3009 case '"':
3010 dest->nonnull = 1;
3011 dest->quote = !dest->quote;
3012 break;
3013 #ifndef __U_BOOT__
3014 case '`':
3015 process_command_subs(dest, ctx, input, '`');
3016 break;
3017 case '>':
3018 redir_fd = redirect_opt_num(dest);
3019 done_word(dest, ctx);
3020 redir_style=REDIRECT_OVERWRITE;
3021 if (next == '>') {
3022 redir_style=REDIRECT_APPEND;
3023 b_getch(input);
3024 } else if (next == '(') {
3025 syntax(); /* until we support >(list) Process Substitution */
3026 return 1;
3027 }
3028 setup_redirect(ctx, redir_fd, redir_style, input);
3029 break;
3030 case '<':
3031 redir_fd = redirect_opt_num(dest);
3032 done_word(dest, ctx);
3033 redir_style=REDIRECT_INPUT;
3034 if (next == '<') {
3035 redir_style=REDIRECT_HEREIS;
3036 b_getch(input);
3037 } else if (next == '>') {
3038 redir_style=REDIRECT_IO;
3039 b_getch(input);
3040 } else if (next == '(') {
3041 syntax(); /* until we support <(list) Process Substitution */
3042 return 1;
3043 }
3044 setup_redirect(ctx, redir_fd, redir_style, input);
3045 break;
3046 #endif
3047 case ';':
3048 done_word(dest, ctx);
3049 done_pipe(ctx,PIPE_SEQ);
3050 break;
3051 case '&':
3052 done_word(dest, ctx);
3053 if (next=='&') {
3054 b_getch(input);
3055 done_pipe(ctx,PIPE_AND);
3056 } else {
3057 #ifndef __U_BOOT__
3058 done_pipe(ctx,PIPE_BG);
3059 #else
3060 syntax_err();
3061 return 1;
3062 #endif
3063 }
3064 break;
3065 case '|':
3066 done_word(dest, ctx);
3067 if (next=='|') {
3068 b_getch(input);
3069 done_pipe(ctx,PIPE_OR);
3070 } else {
3071 /* we could pick up a file descriptor choice here
3072 * with redirect_opt_num(), but bash doesn't do it.
3073 * "echo foo 2| cat" yields "foo 2". */
3074 #ifndef __U_BOOT__
3075 done_command(ctx);
3076 #else
3077 syntax_err();
3078 return 1;
3079 #endif
3080 }
3081 break;
3082 #ifndef __U_BOOT__
3083 case '(':
3084 case '{':
3085 if (parse_group(dest, ctx, input, ch)!=0) return 1;
3086 break;
3087 case ')':
3088 case '}':
3089 syntax(); /* Proper use of this character caught by end_trigger */
3090 return 1;
3091 break;
3092 #endif
3093 case SUBSTED_VAR_SYMBOL:
3094 dest->nonnull = 1;
3095 while (ch = b_getch(input), ch != EOF &&
3096 ch != SUBSTED_VAR_SYMBOL) {
3097 debug_printf("subst, pass=%d\n", ch);
3098 if (input->__promptme == 0)
3099 return 1;
3100 b_addchr(dest, ch);
3101 }
3102 debug_printf("subst, term=%d\n", ch);
3103 if (ch == EOF) {
3104 syntax();
3105 return 1;
3106 }
3107 break;
3108 default:
3109 syntax(); /* this is really an internal logic error */
3110 return 1;
3111 }
3112 }
3113 }
3114 /* complain if quote? No, maybe we just finished a command substitution
3115 * that was quoted. Example:
3116 * $ echo "`cat foo` plus more"
3117 * and we just got the EOF generated by the subshell that ran "cat foo"
3118 * The only real complaint is if we got an EOF when end_trigger != '\0',
3119 * that is, we were really supposed to get end_trigger, and never got
3120 * one before the EOF. Can't use the standard "syntax error" return code,
3121 * so that parse_stream_outer can distinguish the EOF and exit smoothly. */
3122 debug_printf("leaving parse_stream (EOF)\n");
3123 if (end_trigger != '\0') return -1;
3124 return 0;
3125 }
3126
3127 static void mapset(const unsigned char *set, int code)
3128 {
3129 const unsigned char *s;
3130 for (s=set; *s; s++) map[*s] = code;
3131 }
3132
3133 static void update_ifs_map(void)
3134 {
3135 /* char *ifs and char map[256] are both globals. */
3136 ifs = (uchar *)getenv("IFS");
3137 if (ifs == NULL) ifs=(uchar *)" \t\n";
3138 /* Precompute a list of 'flow through' behavior so it can be treated
3139 * quickly up front. Computation is necessary because of IFS.
3140 * Special case handling of IFS == " \t\n" is not implemented.
3141 * The map[] array only really needs two bits each, and on most machines
3142 * that would be faster because of the reduced L1 cache footprint.
3143 */
3144 memset(map,0,sizeof(map)); /* most characters flow through always */
3145 #ifndef __U_BOOT__
3146 mapset((uchar *)"\\$'\"`", 3); /* never flow through */
3147 mapset((uchar *)"<>;&|(){}#", 1); /* flow through if quoted */
3148 #else
3149 {
3150 uchar subst[2] = {SUBSTED_VAR_SYMBOL, 0};
3151 mapset(subst, 3); /* never flow through */
3152 }
3153 mapset((uchar *)"\\$'\"", 3); /* never flow through */
3154 mapset((uchar *)";&|#", 1); /* flow through if quoted */
3155 #endif
3156 mapset(ifs, 2); /* also flow through if quoted */
3157 }
3158
3159 /* most recursion does not come through here, the exeception is
3160 * from builtin_source() */
3161 static int parse_stream_outer(struct in_str *inp, int flag)
3162 {
3163
3164 struct p_context ctx;
3165 o_string temp=NULL_O_STRING;
3166 int rcode;
3167 #ifdef __U_BOOT__
3168 int code = 0;
3169 #endif
3170 do {
3171 ctx.type = flag;
3172 initialize_context(&ctx);
3173 update_ifs_map();
3174 if (!(flag & FLAG_PARSE_SEMICOLON) || (flag & FLAG_REPARSING)) mapset((uchar *)";$&|", 0);
3175 inp->promptmode=1;
3176 rcode = parse_stream(&temp, &ctx, inp, '\n');
3177 #ifdef __U_BOOT__
3178 if (rcode == 1) flag_repeat = 0;
3179 #endif
3180 if (rcode != 1 && ctx.old_flag != 0) {
3181 syntax();
3182 #ifdef __U_BOOT__
3183 flag_repeat = 0;
3184 #endif
3185 }
3186 if (rcode != 1 && ctx.old_flag == 0) {
3187 done_word(&temp, &ctx);
3188 done_pipe(&ctx,PIPE_SEQ);
3189 #ifndef __U_BOOT__
3190 run_list(ctx.list_head);
3191 #else
3192 code = run_list(ctx.list_head);
3193 if (code == -2) { /* exit */
3194 b_free(&temp);
3195 code = 0;
3196 /* XXX hackish way to not allow exit from main loop */
3197 if (inp->peek == file_peek) {
3198 printf("exit not allowed from main input shell.\n");
3199 continue;
3200 }
3201 break;
3202 }
3203 if (code == -1)
3204 flag_repeat = 0;
3205 #endif
3206 } else {
3207 if (ctx.old_flag != 0) {
3208 free(ctx.stack);
3209 b_reset(&temp);
3210 }
3211 #ifdef __U_BOOT__
3212 if (inp->__promptme == 0) printf("<INTERRUPT>\n");
3213 inp->__promptme = 1;
3214 #endif
3215 temp.nonnull = 0;
3216 temp.quote = 0;
3217 inp->p = NULL;
3218 free_pipe_list(ctx.list_head,0);
3219 }
3220 b_free(&temp);
3221 } while (rcode != -1 && !(flag & FLAG_EXIT_FROM_LOOP)); /* loop on syntax errors, return on EOF */
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
3232 int parse_string_outer(const char *s, int flag)
3233 #endif /* __U_BOOT__ */
3234 {
3235 struct in_str input;
3236 #ifdef __U_BOOT__
3237 char *p = NULL;
3238 int rcode;
3239 if ( !s || !*s)
3240 return 1;
3241 if (!(p = strchr(s, '\n')) || *++p) {
3242 p = xmalloc(strlen(s) + 2);
3243 strcpy(p, s);
3244 strcat(p, "\n");
3245 setup_string_in_str(&input, p);
3246 rcode = parse_stream_outer(&input, flag);
3247 free(p);
3248 return rcode;
3249 } else {
3250 #endif
3251 setup_string_in_str(&input, s);
3252 return parse_stream_outer(&input, flag);
3253 #ifdef __U_BOOT__
3254 }
3255 #endif
3256 }
3257
3258 #ifndef __U_BOOT__
3259 static int parse_file_outer(FILE *f)
3260 #else
3261 int parse_file_outer(void)
3262 #endif
3263 {
3264 int rcode;
3265 struct in_str input;
3266 #ifndef __U_BOOT__
3267 setup_file_in_str(&input, f);
3268 #else
3269 setup_file_in_str(&input);
3270 #endif
3271 rcode = parse_stream_outer(&input, FLAG_PARSE_SEMICOLON);
3272 return rcode;
3273 }
3274
3275 #ifdef __U_BOOT__
3276 #ifdef CONFIG_NEEDS_MANUAL_RELOC
3277 static void u_boot_hush_reloc(void)
3278 {
3279 unsigned long addr;
3280 struct reserved_combo *r;
3281
3282 for (r=reserved_list; r<reserved_list+NRES; r++) {
3283 addr = (ulong) (r->literal) + gd->reloc_off;
3284 r->literal = (char *)addr;
3285 }
3286 }
3287 #endif
3288
3289 int u_boot_hush_start(void)
3290 {
3291 if (top_vars == NULL) {
3292 top_vars = malloc(sizeof(struct variables));
3293 top_vars->name = "HUSH_VERSION";
3294 top_vars->value = "0.01";
3295 top_vars->next = NULL;
3296 top_vars->flg_export = 0;
3297 top_vars->flg_read_only = 1;
3298 #ifdef CONFIG_NEEDS_MANUAL_RELOC
3299 u_boot_hush_reloc();
3300 #endif
3301 }
3302 return 0;
3303 }
3304
3305 static void *xmalloc(size_t size)
3306 {
3307 void *p = NULL;
3308
3309 if (!(p = malloc(size))) {
3310 printf("ERROR : memory not allocated\n");
3311 for(;;);
3312 }
3313 return p;
3314 }
3315
3316 static void *xrealloc(void *ptr, size_t size)
3317 {
3318 void *p = NULL;
3319
3320 if (!(p = realloc(ptr, size))) {
3321 printf("ERROR : memory not allocated\n");
3322 for(;;);
3323 }
3324 return p;
3325 }
3326 #endif /* __U_BOOT__ */
3327
3328 #ifndef __U_BOOT__
3329 /* Make sure we have a controlling tty. If we get started under a job
3330 * aware app (like bash for example), make sure we are now in charge so
3331 * we don't fight over who gets the foreground */
3332 static void setup_job_control(void)
3333 {
3334 static pid_t shell_pgrp;
3335 /* Loop until we are in the foreground. */
3336 while (tcgetpgrp (shell_terminal) != (shell_pgrp = getpgrp ()))
3337 kill (- shell_pgrp, SIGTTIN);
3338
3339 /* Ignore interactive and job-control signals. */
3340 signal(SIGINT, SIG_IGN);
3341 signal(SIGQUIT, SIG_IGN);
3342 signal(SIGTERM, SIG_IGN);
3343 signal(SIGTSTP, SIG_IGN);
3344 signal(SIGTTIN, SIG_IGN);
3345 signal(SIGTTOU, SIG_IGN);
3346 signal(SIGCHLD, SIG_IGN);
3347
3348 /* Put ourselves in our own process group. */
3349 setsid();
3350 shell_pgrp = getpid ();
3351 setpgid (shell_pgrp, shell_pgrp);
3352
3353 /* Grab control of the terminal. */
3354 tcsetpgrp(shell_terminal, shell_pgrp);
3355 }
3356
3357 int hush_main(int argc, char * const *argv)
3358 {
3359 int opt;
3360 FILE *input;
3361 char **e = environ;
3362
3363 /* XXX what should these be while sourcing /etc/profile? */
3364 global_argc = argc;
3365 global_argv = argv;
3366
3367 /* (re?) initialize globals. Sometimes hush_main() ends up calling
3368 * hush_main(), therefore we cannot rely on the BSS to zero out this
3369 * stuff. Reset these to 0 every time. */
3370 ifs = NULL;
3371 /* map[] is taken care of with call to update_ifs_map() */
3372 fake_mode = 0;
3373 interactive = 0;
3374 close_me_head = NULL;
3375 last_bg_pid = 0;
3376 job_list = NULL;
3377 last_jobid = 0;
3378
3379 /* Initialize some more globals to non-zero values */
3380 set_cwd();
3381 #ifdef CONFIG_FEATURE_COMMAND_EDITING
3382 cmdedit_set_initial_prompt();
3383 #else
3384 PS1 = NULL;
3385 #endif
3386 PS2 = "> ";
3387
3388 /* initialize our shell local variables with the values
3389 * currently living in the environment */
3390 if (e) {
3391 for (; *e; e++)
3392 set_local_var(*e, 2); /* without call putenv() */
3393 }
3394
3395 last_return_code=EXIT_SUCCESS;
3396
3397
3398 if (argv[0] && argv[0][0] == '-') {
3399 debug_printf("\nsourcing /etc/profile\n");
3400 if ((input = fopen("/etc/profile", "r")) != NULL) {
3401 mark_open(fileno(input));
3402 parse_file_outer(input);
3403 mark_closed(fileno(input));
3404 fclose(input);
3405 }
3406 }
3407 input=stdin;
3408
3409 while ((opt = getopt(argc, argv, "c:xif")) > 0) {
3410 switch (opt) {
3411 case 'c':
3412 {
3413 global_argv = argv+optind;
3414 global_argc = argc-optind;
3415 opt = parse_string_outer(optarg, FLAG_PARSE_SEMICOLON);
3416 goto final_return;
3417 }
3418 break;
3419 case 'i':
3420 interactive++;
3421 break;
3422 case 'f':
3423 fake_mode++;
3424 break;
3425 default:
3426 #ifndef BB_VER
3427 fprintf(stderr, "Usage: sh [FILE]...\n"
3428 " or: sh -c command [args]...\n\n");
3429 exit(EXIT_FAILURE);
3430 #else
3431 show_usage();
3432 #endif
3433 }
3434 }
3435 /* A shell is interactive if the `-i' flag was given, or if all of
3436 * the following conditions are met:
3437 * no -c command
3438 * no arguments remaining or the -s flag given
3439 * standard input is a terminal
3440 * standard output is a terminal
3441 * Refer to Posix.2, the description of the `sh' utility. */
3442 if (argv[optind]==NULL && input==stdin &&
3443 isatty(fileno(stdin)) && isatty(fileno(stdout))) {
3444 interactive++;
3445 }
3446
3447 debug_printf("\ninteractive=%d\n", interactive);
3448 if (interactive) {
3449 /* Looks like they want an interactive shell */
3450 #ifndef CONFIG_FEATURE_SH_EXTRA_QUIET
3451 printf( "\n\n" BB_BANNER " hush - the humble shell v0.01 (testing)\n");
3452 printf( "Enter 'help' for a list of built-in commands.\n\n");
3453 #endif
3454 setup_job_control();
3455 }
3456
3457 if (argv[optind]==NULL) {
3458 opt=parse_file_outer(stdin);
3459 goto final_return;
3460 }
3461
3462 debug_printf("\nrunning script '%s'\n", argv[optind]);
3463 global_argv = argv+optind;
3464 global_argc = argc-optind;
3465 input = xfopen(argv[optind], "r");
3466 opt = parse_file_outer(input);
3467
3468 #ifdef CONFIG_FEATURE_CLEAN_UP
3469 fclose(input);
3470 if (cwd && cwd != unknown)
3471 free((char*)cwd);
3472 {
3473 struct variables *cur, *tmp;
3474 for(cur = top_vars; cur; cur = tmp) {
3475 tmp = cur->next;
3476 if (!cur->flg_read_only) {
3477 free(cur->name);
3478 free(cur->value);
3479 free(cur);
3480 }
3481 }
3482 }
3483 #endif
3484
3485 final_return:
3486 return(opt?opt:last_return_code);
3487 }
3488 #endif
3489
3490 static char *insert_var_value(char *inp)
3491 {
3492 return insert_var_value_sub(inp, 0);
3493 }
3494
3495 static char *insert_var_value_sub(char *inp, int tag_subst)
3496 {
3497 int res_str_len = 0;
3498 int len;
3499 int done = 0;
3500 char *p, *p1, *res_str = NULL;
3501
3502 while ((p = strchr(inp, SPECIAL_VAR_SYMBOL))) {
3503 /* check the beginning of the string for normal charachters */
3504 if (p != inp) {
3505 /* copy any charachters to the result string */
3506 len = p - inp;
3507 res_str = xrealloc(res_str, (res_str_len + len));
3508 strncpy((res_str + res_str_len), inp, len);
3509 res_str_len += len;
3510 }
3511 inp = ++p;
3512 /* find the ending marker */
3513 p = strchr(inp, SPECIAL_VAR_SYMBOL);
3514 *p = '\0';
3515 /* look up the value to substitute */
3516 if ((p1 = lookup_param(inp))) {
3517 if (tag_subst)
3518 len = res_str_len + strlen(p1) + 2;
3519 else
3520 len = res_str_len + strlen(p1);
3521 res_str = xrealloc(res_str, (1 + len));
3522 if (tag_subst) {
3523 /*
3524 * copy the variable value to the result
3525 * string
3526 */
3527 strcpy((res_str + res_str_len + 1), p1);
3528
3529 /*
3530 * mark the replaced text to be accepted as
3531 * is
3532 */
3533 res_str[res_str_len] = SUBSTED_VAR_SYMBOL;
3534 res_str[res_str_len + 1 + strlen(p1)] =
3535 SUBSTED_VAR_SYMBOL;
3536 } else
3537 /*
3538 * copy the variable value to the result
3539 * string
3540 */
3541 strcpy((res_str + res_str_len), p1);
3542
3543 res_str_len = len;
3544 }
3545 *p = SPECIAL_VAR_SYMBOL;
3546 inp = ++p;
3547 done = 1;
3548 }
3549 if (done) {
3550 res_str = xrealloc(res_str, (1 + res_str_len + strlen(inp)));
3551 strcpy((res_str + res_str_len), inp);
3552 while ((p = strchr(res_str, '\n'))) {
3553 *p = ' ';
3554 }
3555 }
3556 return (res_str == NULL) ? inp : res_str;
3557 }
3558
3559 static char **make_list_in(char **inp, char *name)
3560 {
3561 int len, i;
3562 int name_len = strlen(name);
3563 int n = 0;
3564 char **list;
3565 char *p1, *p2, *p3;
3566
3567 /* create list of variable values */
3568 list = xmalloc(sizeof(*list));
3569 for (i = 0; inp[i]; i++) {
3570 p3 = insert_var_value(inp[i]);
3571 p1 = p3;
3572 while (*p1) {
3573 if ((*p1 == ' ')) {
3574 p1++;
3575 continue;
3576 }
3577 if ((p2 = strchr(p1, ' '))) {
3578 len = p2 - p1;
3579 } else {
3580 len = strlen(p1);
3581 p2 = p1 + len;
3582 }
3583 /* we use n + 2 in realloc for list,because we add
3584 * new element and then we will add NULL element */
3585 list = xrealloc(list, sizeof(*list) * (n + 2));
3586 list[n] = xmalloc(2 + name_len + len);
3587 strcpy(list[n], name);
3588 strcat(list[n], "=");
3589 strncat(list[n], p1, len);
3590 list[n++][name_len + len + 1] = '\0';
3591 p1 = p2;
3592 }
3593 if (p3 != inp[i]) free(p3);
3594 }
3595 list[n] = NULL;
3596 return list;
3597 }
3598
3599 /* Make new string for parser */
3600 static char * make_string(char ** inp)
3601 {
3602 char *p;
3603 char *str = NULL;
3604 int n;
3605 int len = 2;
3606 char *noeval_str;
3607 int noeval = 0;
3608
3609 noeval_str = get_local_var("HUSH_NO_EVAL");
3610 if (noeval_str != NULL && *noeval_str != '0' && *noeval_str != '\0')
3611 noeval = 1;
3612 for (n = 0; inp[n]; n++) {
3613 p = insert_var_value_sub(inp[n], noeval);
3614 str = xrealloc(str, (len + strlen(p)));
3615 if (n) {
3616 strcat(str, " ");
3617 } else {
3618 *str = '\0';
3619 }
3620 strcat(str, p);
3621 len = strlen(str) + 3;
3622 if (p != inp[n]) free(p);
3623 }
3624 len = strlen(str);
3625 *(str + len) = '\n';
3626 *(str + len + 1) = '\0';
3627 return str;
3628 }
3629
3630 #ifdef __U_BOOT__
3631 static int do_showvar(cmd_tbl_t *cmdtp, int flag, int argc,
3632 char * const argv[])
3633 {
3634 int i, k;
3635 int rcode = 0;
3636 struct variables *cur;
3637
3638 if (argc == 1) { /* Print all env variables */
3639 for (cur = top_vars; cur; cur = cur->next) {
3640 printf ("%s=%s\n", cur->name, cur->value);
3641 if (ctrlc ()) {
3642 puts ("\n ** Abort\n");
3643 return 1;
3644 }
3645 }
3646 return 0;
3647 }
3648 for (i = 1; i < argc; ++i) { /* print single env variables */
3649 char *name = argv[i];
3650
3651 k = -1;
3652 for (cur = top_vars; cur; cur = cur->next) {
3653 if(strcmp (cur->name, name) == 0) {
3654 k = 0;
3655 printf ("%s=%s\n", cur->name, cur->value);
3656 }
3657 if (ctrlc ()) {
3658 puts ("\n ** Abort\n");
3659 return 1;
3660 }
3661 }
3662 if (k < 0) {
3663 printf ("## Error: \"%s\" not defined\n", name);
3664 rcode ++;
3665 }
3666 }
3667 return rcode;
3668 }
3669
3670 U_BOOT_CMD(
3671 showvar, CONFIG_SYS_MAXARGS, 1, do_showvar,
3672 "print local hushshell variables",
3673 "\n - print values of all hushshell variables\n"
3674 "showvar name ...\n"
3675 " - print value of hushshell variable 'name'"
3676 );
3677
3678 #endif
3679 /****************************************************************************/
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