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cmd_usage(): simplify return code handling
[people/ms/u-boot.git] / common / hush.c
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 * simple_itoa() was lifted from boa-0.93.15
21 * b_addchr() derived from similar w_addchar function in glibc-2.2
22 * setup_redirect(), redirect_opt_num(), and big chunks of main()
23 * and many builtins derived from contributions by Erik Andersen
24 * miscellaneous bugfixes from Matt Kraai
25 *
26 * There are two big (and related) architecture differences between
27 * this parser and the lash parser. One is that this version is
28 * actually designed from the ground up to understand nearly all
29 * of the Bourne grammar. The second, consequential change is that
30 * the parser and input reader have been turned inside out. Now,
31 * the parser is in control, and asks for input as needed. The old
32 * way had the input reader in control, and it asked for parsing to
33 * take place as needed. The new way makes it much easier to properly
34 * handle the recursion implicit in the various substitutions, especially
35 * across continuation lines.
36 *
37 * Bash grammar not implemented: (how many of these were in original sh?)
38 * $@ (those sure look like weird quoting rules)
39 * $_
40 * ! negation operator for pipes
41 * &> and >& redirection of stdout+stderr
42 * Brace Expansion
43 * Tilde Expansion
44 * fancy forms of Parameter Expansion
45 * aliases
46 * Arithmetic Expansion
47 * <(list) and >(list) Process Substitution
48 * reserved words: case, esac, select, function
49 * Here Documents ( << word )
50 * Functions
51 * Major bugs:
52 * job handling woefully incomplete and buggy
53 * reserved word execution woefully incomplete and buggy
54 * to-do:
55 * port selected bugfixes from post-0.49 busybox lash - done?
56 * finish implementing reserved words: for, while, until, do, done
57 * change { and } from special chars to reserved words
58 * builtins: break, continue, eval, return, set, trap, ulimit
59 * test magic exec
60 * handle children going into background
61 * clean up recognition of null pipes
62 * check setting of global_argc and global_argv
63 * control-C handling, probably with longjmp
64 * follow IFS rules more precisely, including update semantics
65 * figure out what to do with backslash-newline
66 * explain why we use signal instead of sigaction
67 * propagate syntax errors, die on resource errors?
68 * continuation lines, both explicit and implicit - done?
69 * memory leak finding and plugging - done?
70 * more testing, especially quoting rules and redirection
71 * document how quoting rules not precisely followed for variable assignments
72 * maybe change map[] to use 2-bit entries
73 * (eventually) remove all the printf's
74 *
75 * This program is free software; you can redistribute it and/or modify
76 * it under the terms of the GNU General Public License as published by
77 * the Free Software Foundation; either version 2 of the License, or
78 * (at your option) any later version.
79 *
80 * This program is distributed in the hope that it will be useful,
81 * but WITHOUT ANY WARRANTY; without even the implied warranty of
82 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
83 * General Public License for more details.
84 *
85 * You should have received a copy of the GNU General Public License
86 * along with this program; if not, write to the Free Software
87 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
88 */
89 #define __U_BOOT__
90 #ifdef __U_BOOT__
91 #include <malloc.h> /* malloc, free, realloc*/
92 #include <linux/ctype.h> /* isalpha, isdigit */
93 #include <common.h> /* readline */
94 #include <hush.h>
95 #include <command.h> /* find_cmd */
96 /*cmd_boot.c*/
97 extern int do_bootd (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]); /* do_bootd */
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 #ifndef __U_BOOT__
131 #define FLAG_EXIT_FROM_LOOP 1
132 #define FLAG_PARSE_SEMICOLON (1 << 1) /* symbol ';' is special for parser */
133 #define FLAG_REPARSING (1 << 2) /* >= 2nd pass */
134
135 #endif
136
137 #ifdef __U_BOOT__
138 DECLARE_GLOBAL_DATA_PTR;
139
140 #define EXIT_SUCCESS 0
141 #define EOF -1
142 #define syntax() syntax_err()
143 #define xstrdup strdup
144 #define error_msg printf
145 #else
146 typedef enum {
147 REDIRECT_INPUT = 1,
148 REDIRECT_OVERWRITE = 2,
149 REDIRECT_APPEND = 3,
150 REDIRECT_HEREIS = 4,
151 REDIRECT_IO = 5
152 } redir_type;
153
154 /* The descrip member of this structure is only used to make debugging
155 * output pretty */
156 struct {int mode; int default_fd; char *descrip;} redir_table[] = {
157 { 0, 0, "()" },
158 { O_RDONLY, 0, "<" },
159 { O_CREAT|O_TRUNC|O_WRONLY, 1, ">" },
160 { O_CREAT|O_APPEND|O_WRONLY, 1, ">>" },
161 { O_RDONLY, -1, "<<" },
162 { O_RDWR, 1, "<>" }
163 };
164 #endif
165
166 typedef enum {
167 PIPE_SEQ = 1,
168 PIPE_AND = 2,
169 PIPE_OR = 3,
170 PIPE_BG = 4,
171 } pipe_style;
172
173 /* might eventually control execution */
174 typedef enum {
175 RES_NONE = 0,
176 RES_IF = 1,
177 RES_THEN = 2,
178 RES_ELIF = 3,
179 RES_ELSE = 4,
180 RES_FI = 5,
181 RES_FOR = 6,
182 RES_WHILE = 7,
183 RES_UNTIL = 8,
184 RES_DO = 9,
185 RES_DONE = 10,
186 RES_XXXX = 11,
187 RES_IN = 12,
188 RES_SNTX = 13
189 } reserved_style;
190 #define FLAG_END (1<<RES_NONE)
191 #define FLAG_IF (1<<RES_IF)
192 #define FLAG_THEN (1<<RES_THEN)
193 #define FLAG_ELIF (1<<RES_ELIF)
194 #define FLAG_ELSE (1<<RES_ELSE)
195 #define FLAG_FI (1<<RES_FI)
196 #define FLAG_FOR (1<<RES_FOR)
197 #define FLAG_WHILE (1<<RES_WHILE)
198 #define FLAG_UNTIL (1<<RES_UNTIL)
199 #define FLAG_DO (1<<RES_DO)
200 #define FLAG_DONE (1<<RES_DONE)
201 #define FLAG_IN (1<<RES_IN)
202 #define FLAG_START (1<<RES_XXXX)
203
204 /* This holds pointers to the various results of parsing */
205 struct p_context {
206 struct child_prog *child;
207 struct pipe *list_head;
208 struct pipe *pipe;
209 #ifndef __U_BOOT__
210 struct redir_struct *pending_redirect;
211 #endif
212 reserved_style w;
213 int old_flag; /* for figuring out valid reserved words */
214 struct p_context *stack;
215 int type; /* define type of parser : ";$" common or special symbol */
216 /* How about quoting status? */
217 };
218
219 #ifndef __U_BOOT__
220 struct redir_struct {
221 redir_type type; /* type of redirection */
222 int fd; /* file descriptor being redirected */
223 int dup; /* -1, or file descriptor being duplicated */
224 struct redir_struct *next; /* pointer to the next redirect in the list */
225 glob_t word; /* *word.gl_pathv is the filename */
226 };
227 #endif
228
229 struct child_prog {
230 #ifndef __U_BOOT__
231 pid_t pid; /* 0 if exited */
232 #endif
233 char **argv; /* program name and arguments */
234 #ifdef __U_BOOT__
235 int argc; /* number of program arguments */
236 #endif
237 struct pipe *group; /* if non-NULL, first in group or subshell */
238 #ifndef __U_BOOT__
239 int subshell; /* flag, non-zero if group must be forked */
240 struct redir_struct *redirects; /* I/O redirections */
241 glob_t glob_result; /* result of parameter globbing */
242 int is_stopped; /* is the program currently running? */
243 struct pipe *family; /* pointer back to the child's parent pipe */
244 #endif
245 int sp; /* number of SPECIAL_VAR_SYMBOL */
246 int type;
247 };
248
249 struct pipe {
250 #ifndef __U_BOOT__
251 int jobid; /* job number */
252 #endif
253 int num_progs; /* total number of programs in job */
254 #ifndef __U_BOOT__
255 int running_progs; /* number of programs running */
256 char *text; /* name of job */
257 char *cmdbuf; /* buffer various argv's point into */
258 pid_t pgrp; /* process group ID for the job */
259 #endif
260 struct child_prog *progs; /* array of commands in pipe */
261 struct pipe *next; /* to track background commands */
262 #ifndef __U_BOOT__
263 int stopped_progs; /* number of programs alive, but stopped */
264 int job_context; /* bitmask defining current context */
265 #endif
266 pipe_style followup; /* PIPE_BG, PIPE_SEQ, PIPE_OR, PIPE_AND */
267 reserved_style r_mode; /* supports if, for, while, until */
268 };
269
270 #ifndef __U_BOOT__
271 struct close_me {
272 int fd;
273 struct close_me *next;
274 };
275 #endif
276
277 struct variables {
278 char *name;
279 char *value;
280 int flg_export;
281 int flg_read_only;
282 struct variables *next;
283 };
284
285 /* globals, connect us to the outside world
286 * the first three support $?, $#, and $1 */
287 #ifndef __U_BOOT__
288 char **global_argv;
289 unsigned int global_argc;
290 #endif
291 unsigned int last_return_code;
292 int nesting_level;
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 *get_local_var(const char *var);
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 /* belongs in utility.c */
929 char *simple_itoa(unsigned int i)
930 {
931 /* 21 digits plus null terminator, good for 64-bit or smaller ints */
932 static char local[22];
933 char *p = &local[21];
934 *p-- = '\0';
935 do {
936 *p-- = '0' + i % 10;
937 i /= 10;
938 } while (i > 0);
939 return p + 1;
940 }
941
942 #ifndef __U_BOOT__
943 static int b_adduint(o_string *o, unsigned int i)
944 {
945 int r;
946 char *p = simple_itoa(i);
947 /* no escape checking necessary */
948 do r=b_addchr(o, *p++); while (r==0 && *p);
949 return r;
950 }
951 #endif
952
953 static int static_get(struct in_str *i)
954 {
955 int ch = *i->p++;
956 if (ch=='\0') return EOF;
957 return ch;
958 }
959
960 static int static_peek(struct in_str *i)
961 {
962 return *i->p;
963 }
964
965 #ifndef __U_BOOT__
966 static inline void cmdedit_set_initial_prompt(void)
967 {
968 #ifndef CONFIG_FEATURE_SH_FANCY_PROMPT
969 PS1 = NULL;
970 #else
971 PS1 = getenv("PS1");
972 if(PS1==0)
973 PS1 = "\\w \\$ ";
974 #endif
975 }
976
977 static inline void setup_prompt_string(int promptmode, char **prompt_str)
978 {
979 debug_printf("setup_prompt_string %d ",promptmode);
980 #ifndef CONFIG_FEATURE_SH_FANCY_PROMPT
981 /* Set up the prompt */
982 if (promptmode == 1) {
983 free(PS1);
984 PS1=xmalloc(strlen(cwd)+4);
985 sprintf(PS1, "%s %s", cwd, ( geteuid() != 0 ) ? "$ ":"# ");
986 *prompt_str = PS1;
987 } else {
988 *prompt_str = PS2;
989 }
990 #else
991 *prompt_str = (promptmode==1)? PS1 : PS2;
992 #endif
993 debug_printf("result %s\n",*prompt_str);
994 }
995 #endif
996
997 static void get_user_input(struct in_str *i)
998 {
999 #ifndef __U_BOOT__
1000 char *prompt_str;
1001 static char the_command[BUFSIZ];
1002
1003 setup_prompt_string(i->promptmode, &prompt_str);
1004 #ifdef CONFIG_FEATURE_COMMAND_EDITING
1005 /*
1006 ** enable command line editing only while a command line
1007 ** is actually being read; otherwise, we'll end up bequeathing
1008 ** atexit() handlers and other unwanted stuff to our
1009 ** child processes (rob@sysgo.de)
1010 */
1011 cmdedit_read_input(prompt_str, the_command);
1012 #else
1013 fputs(prompt_str, stdout);
1014 fflush(stdout);
1015 the_command[0]=fgetc(i->file);
1016 the_command[1]='\0';
1017 #endif
1018 fflush(stdout);
1019 i->p = the_command;
1020 #else
1021 extern char console_buffer[];
1022 int n;
1023 static char the_command[CONFIG_SYS_CBSIZE];
1024
1025 #ifdef CONFIG_BOOT_RETRY_TIME
1026 # ifdef CONFIG_RESET_TO_RETRY
1027 extern int do_reset (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]);
1028 # else
1029 # error "This currently only works with CONFIG_RESET_TO_RETRY enabled"
1030 # endif
1031 reset_cmd_timeout();
1032 #endif
1033 i->__promptme = 1;
1034 if (i->promptmode == 1) {
1035 n = readline(CONFIG_SYS_PROMPT);
1036 } else {
1037 n = readline(CONFIG_SYS_PROMPT_HUSH_PS2);
1038 }
1039 #ifdef CONFIG_BOOT_RETRY_TIME
1040 if (n == -2) {
1041 puts("\nTimeout waiting for command\n");
1042 # ifdef CONFIG_RESET_TO_RETRY
1043 do_reset(NULL, 0, 0, NULL);
1044 # else
1045 # error "This currently only works with CONFIG_RESET_TO_RETRY enabled"
1046 # endif
1047 }
1048 #endif
1049 if (n == -1 ) {
1050 flag_repeat = 0;
1051 i->__promptme = 0;
1052 }
1053 n = strlen(console_buffer);
1054 console_buffer[n] = '\n';
1055 console_buffer[n+1]= '\0';
1056 if (had_ctrlc()) flag_repeat = 0;
1057 clear_ctrlc();
1058 do_repeat = 0;
1059 if (i->promptmode == 1) {
1060 if (console_buffer[0] == '\n'&& flag_repeat == 0) {
1061 strcpy(the_command,console_buffer);
1062 }
1063 else {
1064 if (console_buffer[0] != '\n') {
1065 strcpy(the_command,console_buffer);
1066 flag_repeat = 1;
1067 }
1068 else {
1069 do_repeat = 1;
1070 }
1071 }
1072 i->p = the_command;
1073 }
1074 else {
1075 if (console_buffer[0] != '\n') {
1076 if (strlen(the_command) + strlen(console_buffer)
1077 < CONFIG_SYS_CBSIZE) {
1078 n = strlen(the_command);
1079 the_command[n-1] = ' ';
1080 strcpy(&the_command[n],console_buffer);
1081 }
1082 else {
1083 the_command[0] = '\n';
1084 the_command[1] = '\0';
1085 flag_repeat = 0;
1086 }
1087 }
1088 if (i->__promptme == 0) {
1089 the_command[0] = '\n';
1090 the_command[1] = '\0';
1091 }
1092 i->p = console_buffer;
1093 }
1094 #endif
1095 }
1096
1097 /* This is the magic location that prints prompts
1098 * and gets data back from the user */
1099 static int file_get(struct in_str *i)
1100 {
1101 int ch;
1102
1103 ch = 0;
1104 /* If there is data waiting, eat it up */
1105 if (i->p && *i->p) {
1106 ch = *i->p++;
1107 } else {
1108 /* need to double check i->file because we might be doing something
1109 * more complicated by now, like sourcing or substituting. */
1110 #ifndef __U_BOOT__
1111 if (i->__promptme && interactive && i->file == stdin) {
1112 while(! i->p || (interactive && strlen(i->p)==0) ) {
1113 #else
1114 while(! i->p || strlen(i->p)==0 ) {
1115 #endif
1116 get_user_input(i);
1117 }
1118 i->promptmode=2;
1119 #ifndef __U_BOOT__
1120 i->__promptme = 0;
1121 #endif
1122 if (i->p && *i->p) {
1123 ch = *i->p++;
1124 }
1125 #ifndef __U_BOOT__
1126 } else {
1127 ch = fgetc(i->file);
1128 }
1129
1130 #endif
1131 debug_printf("b_getch: got a %d\n", ch);
1132 }
1133 #ifndef __U_BOOT__
1134 if (ch == '\n') i->__promptme=1;
1135 #endif
1136 return ch;
1137 }
1138
1139 /* All the callers guarantee this routine will never be
1140 * used right after a newline, so prompting is not needed.
1141 */
1142 static int file_peek(struct in_str *i)
1143 {
1144 #ifndef __U_BOOT__
1145 if (i->p && *i->p) {
1146 #endif
1147 return *i->p;
1148 #ifndef __U_BOOT__
1149 } else {
1150 i->peek_buf[0] = fgetc(i->file);
1151 i->peek_buf[1] = '\0';
1152 i->p = i->peek_buf;
1153 debug_printf("b_peek: got a %d\n", *i->p);
1154 return *i->p;
1155 }
1156 #endif
1157 }
1158
1159 #ifndef __U_BOOT__
1160 static void setup_file_in_str(struct in_str *i, FILE *f)
1161 #else
1162 static void setup_file_in_str(struct in_str *i)
1163 #endif
1164 {
1165 i->peek = file_peek;
1166 i->get = file_get;
1167 i->__promptme=1;
1168 i->promptmode=1;
1169 #ifndef __U_BOOT__
1170 i->file = f;
1171 #endif
1172 i->p = NULL;
1173 }
1174
1175 static void setup_string_in_str(struct in_str *i, const char *s)
1176 {
1177 i->peek = static_peek;
1178 i->get = static_get;
1179 i->__promptme=1;
1180 i->promptmode=1;
1181 i->p = s;
1182 }
1183
1184 #ifndef __U_BOOT__
1185 static void mark_open(int fd)
1186 {
1187 struct close_me *new = xmalloc(sizeof(struct close_me));
1188 new->fd = fd;
1189 new->next = close_me_head;
1190 close_me_head = new;
1191 }
1192
1193 static void mark_closed(int fd)
1194 {
1195 struct close_me *tmp;
1196 if (close_me_head == NULL || close_me_head->fd != fd)
1197 error_msg_and_die("corrupt close_me");
1198 tmp = close_me_head;
1199 close_me_head = close_me_head->next;
1200 free(tmp);
1201 }
1202
1203 static void close_all(void)
1204 {
1205 struct close_me *c;
1206 for (c=close_me_head; c; c=c->next) {
1207 close(c->fd);
1208 }
1209 close_me_head = NULL;
1210 }
1211
1212 /* squirrel != NULL means we squirrel away copies of stdin, stdout,
1213 * and stderr if they are redirected. */
1214 static int setup_redirects(struct child_prog *prog, int squirrel[])
1215 {
1216 int openfd, mode;
1217 struct redir_struct *redir;
1218
1219 for (redir=prog->redirects; redir; redir=redir->next) {
1220 if (redir->dup == -1 && redir->word.gl_pathv == NULL) {
1221 /* something went wrong in the parse. Pretend it didn't happen */
1222 continue;
1223 }
1224 if (redir->dup == -1) {
1225 mode=redir_table[redir->type].mode;
1226 openfd = open(redir->word.gl_pathv[0], mode, 0666);
1227 if (openfd < 0) {
1228 /* this could get lost if stderr has been redirected, but
1229 bash and ash both lose it as well (though zsh doesn't!) */
1230 perror_msg("error opening %s", redir->word.gl_pathv[0]);
1231 return 1;
1232 }
1233 } else {
1234 openfd = redir->dup;
1235 }
1236
1237 if (openfd != redir->fd) {
1238 if (squirrel && redir->fd < 3) {
1239 squirrel[redir->fd] = dup(redir->fd);
1240 }
1241 if (openfd == -3) {
1242 close(openfd);
1243 } else {
1244 dup2(openfd, redir->fd);
1245 if (redir->dup == -1)
1246 close (openfd);
1247 }
1248 }
1249 }
1250 return 0;
1251 }
1252
1253 static void restore_redirects(int squirrel[])
1254 {
1255 int i, fd;
1256 for (i=0; i<3; i++) {
1257 fd = squirrel[i];
1258 if (fd != -1) {
1259 /* No error checking. I sure wouldn't know what
1260 * to do with an error if I found one! */
1261 dup2(fd, i);
1262 close(fd);
1263 }
1264 }
1265 }
1266
1267 /* never returns */
1268 /* XXX no exit() here. If you don't exec, use _exit instead.
1269 * The at_exit handlers apparently confuse the calling process,
1270 * in particular stdin handling. Not sure why? */
1271 static void pseudo_exec(struct child_prog *child)
1272 {
1273 int i, rcode;
1274 char *p;
1275 struct built_in_command *x;
1276 if (child->argv) {
1277 for (i=0; is_assignment(child->argv[i]); i++) {
1278 debug_printf("pid %d environment modification: %s\n",getpid(),child->argv[i]);
1279 p = insert_var_value(child->argv[i]);
1280 putenv(strdup(p));
1281 if (p != child->argv[i]) free(p);
1282 }
1283 child->argv+=i; /* XXX this hack isn't so horrible, since we are about
1284 to exit, and therefore don't need to keep data
1285 structures consistent for free() use. */
1286 /* If a variable is assigned in a forest, and nobody listens,
1287 * was it ever really set?
1288 */
1289 if (child->argv[0] == NULL) {
1290 _exit(EXIT_SUCCESS);
1291 }
1292
1293 /*
1294 * Check if the command matches any of the builtins.
1295 * Depending on context, this might be redundant. But it's
1296 * easier to waste a few CPU cycles than it is to figure out
1297 * if this is one of those cases.
1298 */
1299 for (x = bltins; x->cmd; x++) {
1300 if (strcmp(child->argv[0], x->cmd) == 0 ) {
1301 debug_printf("builtin exec %s\n", child->argv[0]);
1302 rcode = x->function(child);
1303 fflush(stdout);
1304 _exit(rcode);
1305 }
1306 }
1307
1308 /* Check if the command matches any busybox internal commands
1309 * ("applets") here.
1310 * FIXME: This feature is not 100% safe, since
1311 * BusyBox is not fully reentrant, so we have no guarantee the things
1312 * from the .bss are still zeroed, or that things from .data are still
1313 * at their defaults. We could exec ourself from /proc/self/exe, but I
1314 * really dislike relying on /proc for things. We could exec ourself
1315 * from global_argv[0], but if we are in a chroot, we may not be able
1316 * to find ourself... */
1317 #ifdef CONFIG_FEATURE_SH_STANDALONE_SHELL
1318 {
1319 int argc_l;
1320 char** argv_l=child->argv;
1321 char *name = child->argv[0];
1322
1323 #ifdef CONFIG_FEATURE_SH_APPLETS_ALWAYS_WIN
1324 /* Following discussions from November 2000 on the busybox mailing
1325 * list, the default configuration, (without
1326 * get_last_path_component()) lets the user force use of an
1327 * external command by specifying the full (with slashes) filename.
1328 * If you enable CONFIG_FEATURE_SH_APPLETS_ALWAYS_WIN then applets
1329 * _aways_ override external commands, so if you want to run
1330 * /bin/cat, it will use BusyBox cat even if /bin/cat exists on the
1331 * filesystem and is _not_ busybox. Some systems may want this,
1332 * most do not. */
1333 name = get_last_path_component(name);
1334 #endif
1335 /* Count argc for use in a second... */
1336 for(argc_l=0;*argv_l!=NULL; argv_l++, argc_l++);
1337 optind = 1;
1338 debug_printf("running applet %s\n", name);
1339 run_applet_by_name(name, argc_l, child->argv);
1340 }
1341 #endif
1342 debug_printf("exec of %s\n",child->argv[0]);
1343 execvp(child->argv[0],child->argv);
1344 perror_msg("couldn't exec: %s",child->argv[0]);
1345 _exit(1);
1346 } else if (child->group) {
1347 debug_printf("runtime nesting to group\n");
1348 interactive=0; /* crucial!!!! */
1349 rcode = run_list_real(child->group);
1350 /* OK to leak memory by not calling free_pipe_list,
1351 * since this process is about to exit */
1352 _exit(rcode);
1353 } else {
1354 /* Can happen. See what bash does with ">foo" by itself. */
1355 debug_printf("trying to pseudo_exec null command\n");
1356 _exit(EXIT_SUCCESS);
1357 }
1358 }
1359
1360 static void insert_bg_job(struct pipe *pi)
1361 {
1362 struct pipe *thejob;
1363
1364 /* Linear search for the ID of the job to use */
1365 pi->jobid = 1;
1366 for (thejob = job_list; thejob; thejob = thejob->next)
1367 if (thejob->jobid >= pi->jobid)
1368 pi->jobid = thejob->jobid + 1;
1369
1370 /* add thejob to the list of running jobs */
1371 if (!job_list) {
1372 thejob = job_list = xmalloc(sizeof(*thejob));
1373 } else {
1374 for (thejob = job_list; thejob->next; thejob = thejob->next) /* nothing */;
1375 thejob->next = xmalloc(sizeof(*thejob));
1376 thejob = thejob->next;
1377 }
1378
1379 /* physically copy the struct job */
1380 memcpy(thejob, pi, sizeof(struct pipe));
1381 thejob->next = NULL;
1382 thejob->running_progs = thejob->num_progs;
1383 thejob->stopped_progs = 0;
1384 thejob->text = xmalloc(BUFSIZ); /* cmdedit buffer size */
1385
1386 /*if (pi->progs[0] && pi->progs[0].argv && pi->progs[0].argv[0]) */
1387 {
1388 char *bar=thejob->text;
1389 char **foo=pi->progs[0].argv;
1390 while(foo && *foo) {
1391 bar += sprintf(bar, "%s ", *foo++);
1392 }
1393 }
1394
1395 /* we don't wait for background thejobs to return -- append it
1396 to the list of backgrounded thejobs and leave it alone */
1397 printf("[%d] %d\n", thejob->jobid, thejob->progs[0].pid);
1398 last_bg_pid = thejob->progs[0].pid;
1399 last_jobid = thejob->jobid;
1400 }
1401
1402 /* remove a backgrounded job */
1403 static void remove_bg_job(struct pipe *pi)
1404 {
1405 struct pipe *prev_pipe;
1406
1407 if (pi == job_list) {
1408 job_list = pi->next;
1409 } else {
1410 prev_pipe = job_list;
1411 while (prev_pipe->next != pi)
1412 prev_pipe = prev_pipe->next;
1413 prev_pipe->next = pi->next;
1414 }
1415 if (job_list)
1416 last_jobid = job_list->jobid;
1417 else
1418 last_jobid = 0;
1419
1420 pi->stopped_progs = 0;
1421 free_pipe(pi, 0);
1422 free(pi);
1423 }
1424
1425 /* Checks to see if any processes have exited -- if they
1426 have, figure out why and see if a job has completed */
1427 static int checkjobs(struct pipe* fg_pipe)
1428 {
1429 int attributes;
1430 int status;
1431 int prognum = 0;
1432 struct pipe *pi;
1433 pid_t childpid;
1434
1435 attributes = WUNTRACED;
1436 if (fg_pipe==NULL) {
1437 attributes |= WNOHANG;
1438 }
1439
1440 while ((childpid = waitpid(-1, &status, attributes)) > 0) {
1441 if (fg_pipe) {
1442 int i, rcode = 0;
1443 for (i=0; i < fg_pipe->num_progs; i++) {
1444 if (fg_pipe->progs[i].pid == childpid) {
1445 if (i==fg_pipe->num_progs-1)
1446 rcode=WEXITSTATUS(status);
1447 (fg_pipe->num_progs)--;
1448 return(rcode);
1449 }
1450 }
1451 }
1452
1453 for (pi = job_list; pi; pi = pi->next) {
1454 prognum = 0;
1455 while (prognum < pi->num_progs && pi->progs[prognum].pid != childpid) {
1456 prognum++;
1457 }
1458 if (prognum < pi->num_progs)
1459 break;
1460 }
1461
1462 if(pi==NULL) {
1463 debug_printf("checkjobs: pid %d was not in our list!\n", childpid);
1464 continue;
1465 }
1466
1467 if (WIFEXITED(status) || WIFSIGNALED(status)) {
1468 /* child exited */
1469 pi->running_progs--;
1470 pi->progs[prognum].pid = 0;
1471
1472 if (!pi->running_progs) {
1473 printf(JOB_STATUS_FORMAT, pi->jobid, "Done", pi->text);
1474 remove_bg_job(pi);
1475 }
1476 } else {
1477 /* child stopped */
1478 pi->stopped_progs++;
1479 pi->progs[prognum].is_stopped = 1;
1480
1481 #if 0
1482 /* Printing this stuff is a pain, since it tends to
1483 * overwrite the prompt an inconveinient moments. So
1484 * don't do that. */
1485 if (pi->stopped_progs == pi->num_progs) {
1486 printf("\n"JOB_STATUS_FORMAT, pi->jobid, "Stopped", pi->text);
1487 }
1488 #endif
1489 }
1490 }
1491
1492 if (childpid == -1 && errno != ECHILD)
1493 perror_msg("waitpid");
1494
1495 /* move the shell to the foreground */
1496 /*if (interactive && tcsetpgrp(shell_terminal, getpgid(0))) */
1497 /* perror_msg("tcsetpgrp-2"); */
1498 return -1;
1499 }
1500
1501 /* Figure out our controlling tty, checking in order stderr,
1502 * stdin, and stdout. If check_pgrp is set, also check that
1503 * we belong to the foreground process group associated with
1504 * that tty. The value of shell_terminal is needed in order to call
1505 * tcsetpgrp(shell_terminal, ...); */
1506 void controlling_tty(int check_pgrp)
1507 {
1508 pid_t curpgrp;
1509
1510 if ((curpgrp = tcgetpgrp(shell_terminal = 2)) < 0
1511 && (curpgrp = tcgetpgrp(shell_terminal = 0)) < 0
1512 && (curpgrp = tcgetpgrp(shell_terminal = 1)) < 0)
1513 goto shell_terminal_error;
1514
1515 if (check_pgrp && curpgrp != getpgid(0))
1516 goto shell_terminal_error;
1517
1518 return;
1519
1520 shell_terminal_error:
1521 shell_terminal = -1;
1522 return;
1523 }
1524 #endif
1525
1526 /* run_pipe_real() starts all the jobs, but doesn't wait for anything
1527 * to finish. See checkjobs().
1528 *
1529 * return code is normally -1, when the caller has to wait for children
1530 * to finish to determine the exit status of the pipe. If the pipe
1531 * is a simple builtin command, however, the action is done by the
1532 * time run_pipe_real returns, and the exit code is provided as the
1533 * return value.
1534 *
1535 * The input of the pipe is always stdin, the output is always
1536 * stdout. The outpipe[] mechanism in BusyBox-0.48 lash is bogus,
1537 * because it tries to avoid running the command substitution in
1538 * subshell, when that is in fact necessary. The subshell process
1539 * now has its stdout directed to the input of the appropriate pipe,
1540 * so this routine is noticeably simpler.
1541 */
1542 static int run_pipe_real(struct pipe *pi)
1543 {
1544 int i;
1545 #ifndef __U_BOOT__
1546 int nextin, nextout;
1547 int pipefds[2]; /* pipefds[0] is for reading */
1548 struct child_prog *child;
1549 struct built_in_command *x;
1550 char *p;
1551 # if __GNUC__
1552 /* Avoid longjmp clobbering */
1553 (void) &i;
1554 (void) &nextin;
1555 (void) &nextout;
1556 (void) &child;
1557 # endif
1558 #else
1559 int nextin;
1560 int flag = do_repeat ? CMD_FLAG_REPEAT : 0;
1561 struct child_prog *child;
1562 cmd_tbl_t *cmdtp;
1563 char *p;
1564 # if __GNUC__
1565 /* Avoid longjmp clobbering */
1566 (void) &i;
1567 (void) &nextin;
1568 (void) &child;
1569 # endif
1570 #endif /* __U_BOOT__ */
1571
1572 nextin = 0;
1573 #ifndef __U_BOOT__
1574 pi->pgrp = -1;
1575 #endif
1576
1577 /* Check if this is a simple builtin (not part of a pipe).
1578 * Builtins within pipes have to fork anyway, and are handled in
1579 * pseudo_exec. "echo foo | read bar" doesn't work on bash, either.
1580 */
1581 if (pi->num_progs == 1) child = & (pi->progs[0]);
1582 #ifndef __U_BOOT__
1583 if (pi->num_progs == 1 && child->group && child->subshell == 0) {
1584 int squirrel[] = {-1, -1, -1};
1585 int rcode;
1586 debug_printf("non-subshell grouping\n");
1587 setup_redirects(child, squirrel);
1588 /* XXX could we merge code with following builtin case,
1589 * by creating a pseudo builtin that calls run_list_real? */
1590 rcode = run_list_real(child->group);
1591 restore_redirects(squirrel);
1592 #else
1593 if (pi->num_progs == 1 && child->group) {
1594 int rcode;
1595 debug_printf("non-subshell grouping\n");
1596 rcode = run_list_real(child->group);
1597 #endif
1598 return rcode;
1599 } else if (pi->num_progs == 1 && pi->progs[0].argv != NULL) {
1600 for (i=0; is_assignment(child->argv[i]); i++) { /* nothing */ }
1601 if (i!=0 && child->argv[i]==NULL) {
1602 /* assignments, but no command: set the local environment */
1603 for (i=0; child->argv[i]!=NULL; i++) {
1604
1605 /* Ok, this case is tricky. We have to decide if this is a
1606 * local variable, or an already exported variable. If it is
1607 * already exported, we have to export the new value. If it is
1608 * not exported, we need only set this as a local variable.
1609 * This junk is all to decide whether or not to export this
1610 * variable. */
1611 int export_me=0;
1612 char *name, *value;
1613 name = xstrdup(child->argv[i]);
1614 debug_printf("Local environment set: %s\n", name);
1615 value = strchr(name, '=');
1616 if (value)
1617 *value=0;
1618 #ifndef __U_BOOT__
1619 if ( get_local_var(name)) {
1620 export_me=1;
1621 }
1622 #endif
1623 free(name);
1624 p = insert_var_value(child->argv[i]);
1625 set_local_var(p, export_me);
1626 if (p != child->argv[i]) free(p);
1627 }
1628 return EXIT_SUCCESS; /* don't worry about errors in set_local_var() yet */
1629 }
1630 for (i = 0; is_assignment(child->argv[i]); i++) {
1631 p = insert_var_value(child->argv[i]);
1632 #ifndef __U_BOOT__
1633 putenv(strdup(p));
1634 #else
1635 set_local_var(p, 0);
1636 #endif
1637 if (p != child->argv[i]) {
1638 child->sp--;
1639 free(p);
1640 }
1641 }
1642 if (child->sp) {
1643 char * str = NULL;
1644
1645 str = make_string((child->argv + i));
1646 parse_string_outer(str, FLAG_EXIT_FROM_LOOP | FLAG_REPARSING);
1647 free(str);
1648 return last_return_code;
1649 }
1650 #ifndef __U_BOOT__
1651 for (x = bltins; x->cmd; x++) {
1652 if (strcmp(child->argv[i], x->cmd) == 0 ) {
1653 int squirrel[] = {-1, -1, -1};
1654 int rcode;
1655 if (x->function == builtin_exec && child->argv[i+1]==NULL) {
1656 debug_printf("magic exec\n");
1657 setup_redirects(child,NULL);
1658 return EXIT_SUCCESS;
1659 }
1660 debug_printf("builtin inline %s\n", child->argv[0]);
1661 /* XXX setup_redirects acts on file descriptors, not FILEs.
1662 * This is perfect for work that comes after exec().
1663 * Is it really safe for inline use? Experimentally,
1664 * things seem to work with glibc. */
1665 setup_redirects(child, squirrel);
1666 #else
1667 /* check ";", because ,example , argv consist from
1668 * "help;flinfo" must not execute
1669 */
1670 if (strchr(child->argv[i], ';')) {
1671 printf ("Unknown command '%s' - try 'help' or use 'run' command\n",
1672 child->argv[i]);
1673 return -1;
1674 }
1675 /* Look up command in command table */
1676
1677
1678 if ((cmdtp = find_cmd(child->argv[i])) == NULL) {
1679 printf ("Unknown command '%s' - try 'help'\n", child->argv[i]);
1680 return -1; /* give up after bad command */
1681 } else {
1682 int rcode;
1683 #if defined(CONFIG_CMD_BOOTD)
1684 extern int do_bootd (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]);
1685
1686 /* avoid "bootd" recursion */
1687 if (cmdtp->cmd == do_bootd) {
1688 if (flag & CMD_FLAG_BOOTD) {
1689 printf ("'bootd' recursion detected\n");
1690 return -1;
1691 }
1692 else
1693 flag |= CMD_FLAG_BOOTD;
1694 }
1695 #endif
1696 /* found - check max args */
1697 if ((child->argc - i) > cmdtp->maxargs)
1698 return cmd_usage(cmdtp);
1699 #endif
1700 child->argv+=i; /* XXX horrible hack */
1701 #ifndef __U_BOOT__
1702 rcode = x->function(child);
1703 #else
1704 /* OK - call function to do the command */
1705
1706 rcode = (cmdtp->cmd)
1707 (cmdtp, flag,child->argc-i,&child->argv[i]);
1708 if ( !cmdtp->repeatable )
1709 flag_repeat = 0;
1710
1711
1712 #endif
1713 child->argv-=i; /* XXX restore hack so free() can work right */
1714 #ifndef __U_BOOT__
1715
1716 restore_redirects(squirrel);
1717 #endif
1718
1719 return rcode;
1720 }
1721 }
1722 #ifndef __U_BOOT__
1723 }
1724
1725 for (i = 0; i < pi->num_progs; i++) {
1726 child = & (pi->progs[i]);
1727
1728 /* pipes are inserted between pairs of commands */
1729 if ((i + 1) < pi->num_progs) {
1730 if (pipe(pipefds)<0) perror_msg_and_die("pipe");
1731 nextout = pipefds[1];
1732 } else {
1733 nextout=1;
1734 pipefds[0] = -1;
1735 }
1736
1737 /* XXX test for failed fork()? */
1738 if (!(child->pid = fork())) {
1739 /* Set the handling for job control signals back to the default. */
1740 signal(SIGINT, SIG_DFL);
1741 signal(SIGQUIT, SIG_DFL);
1742 signal(SIGTERM, SIG_DFL);
1743 signal(SIGTSTP, SIG_DFL);
1744 signal(SIGTTIN, SIG_DFL);
1745 signal(SIGTTOU, SIG_DFL);
1746 signal(SIGCHLD, SIG_DFL);
1747
1748 close_all();
1749
1750 if (nextin != 0) {
1751 dup2(nextin, 0);
1752 close(nextin);
1753 }
1754 if (nextout != 1) {
1755 dup2(nextout, 1);
1756 close(nextout);
1757 }
1758 if (pipefds[0]!=-1) {
1759 close(pipefds[0]); /* opposite end of our output pipe */
1760 }
1761
1762 /* Like bash, explicit redirects override pipes,
1763 * and the pipe fd is available for dup'ing. */
1764 setup_redirects(child,NULL);
1765
1766 if (interactive && pi->followup!=PIPE_BG) {
1767 /* If we (the child) win the race, put ourselves in the process
1768 * group whose leader is the first process in this pipe. */
1769 if (pi->pgrp < 0) {
1770 pi->pgrp = getpid();
1771 }
1772 if (setpgid(0, pi->pgrp) == 0) {
1773 tcsetpgrp(2, pi->pgrp);
1774 }
1775 }
1776
1777 pseudo_exec(child);
1778 }
1779
1780
1781 /* put our child in the process group whose leader is the
1782 first process in this pipe */
1783 if (pi->pgrp < 0) {
1784 pi->pgrp = child->pid;
1785 }
1786 /* Don't check for errors. The child may be dead already,
1787 * in which case setpgid returns error code EACCES. */
1788 setpgid(child->pid, pi->pgrp);
1789
1790 if (nextin != 0)
1791 close(nextin);
1792 if (nextout != 1)
1793 close(nextout);
1794
1795 /* If there isn't another process, nextin is garbage
1796 but it doesn't matter */
1797 nextin = pipefds[0];
1798 }
1799 #endif
1800 return -1;
1801 }
1802
1803 static int run_list_real(struct pipe *pi)
1804 {
1805 char *save_name = NULL;
1806 char **list = NULL;
1807 char **save_list = NULL;
1808 struct pipe *rpipe;
1809 int flag_rep = 0;
1810 #ifndef __U_BOOT__
1811 int save_num_progs;
1812 #endif
1813 int rcode=0, flag_skip=1;
1814 int flag_restore = 0;
1815 int if_code=0, next_if_code=0; /* need double-buffer to handle elif */
1816 reserved_style rmode, skip_more_in_this_rmode=RES_XXXX;
1817 /* check syntax for "for" */
1818 for (rpipe = pi; rpipe; rpipe = rpipe->next) {
1819 if ((rpipe->r_mode == RES_IN ||
1820 rpipe->r_mode == RES_FOR) &&
1821 (rpipe->next == NULL)) {
1822 syntax();
1823 #ifdef __U_BOOT__
1824 flag_repeat = 0;
1825 #endif
1826 return 1;
1827 }
1828 if ((rpipe->r_mode == RES_IN &&
1829 (rpipe->next->r_mode == RES_IN &&
1830 rpipe->next->progs->argv != NULL))||
1831 (rpipe->r_mode == RES_FOR &&
1832 rpipe->next->r_mode != RES_IN)) {
1833 syntax();
1834 #ifdef __U_BOOT__
1835 flag_repeat = 0;
1836 #endif
1837 return 1;
1838 }
1839 }
1840 for (; pi; pi = (flag_restore != 0) ? rpipe : pi->next) {
1841 if (pi->r_mode == RES_WHILE || pi->r_mode == RES_UNTIL ||
1842 pi->r_mode == RES_FOR) {
1843 #ifdef __U_BOOT__
1844 /* check Ctrl-C */
1845 ctrlc();
1846 if ((had_ctrlc())) {
1847 return 1;
1848 }
1849 #endif
1850 flag_restore = 0;
1851 if (!rpipe) {
1852 flag_rep = 0;
1853 rpipe = pi;
1854 }
1855 }
1856 rmode = pi->r_mode;
1857 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);
1858 if (rmode == skip_more_in_this_rmode && flag_skip) {
1859 if (pi->followup == PIPE_SEQ) flag_skip=0;
1860 continue;
1861 }
1862 flag_skip = 1;
1863 skip_more_in_this_rmode = RES_XXXX;
1864 if (rmode == RES_THEN || rmode == RES_ELSE) if_code = next_if_code;
1865 if (rmode == RES_THEN && if_code) continue;
1866 if (rmode == RES_ELSE && !if_code) continue;
1867 if (rmode == RES_ELIF && !if_code) break;
1868 if (rmode == RES_FOR && pi->num_progs) {
1869 if (!list) {
1870 /* if no variable values after "in" we skip "for" */
1871 if (!pi->next->progs->argv) continue;
1872 /* create list of variable values */
1873 list = make_list_in(pi->next->progs->argv,
1874 pi->progs->argv[0]);
1875 save_list = list;
1876 save_name = pi->progs->argv[0];
1877 pi->progs->argv[0] = NULL;
1878 flag_rep = 1;
1879 }
1880 if (!(*list)) {
1881 free(pi->progs->argv[0]);
1882 free(save_list);
1883 list = NULL;
1884 flag_rep = 0;
1885 pi->progs->argv[0] = save_name;
1886 #ifndef __U_BOOT__
1887 pi->progs->glob_result.gl_pathv[0] =
1888 pi->progs->argv[0];
1889 #endif
1890 continue;
1891 } else {
1892 /* insert new value from list for variable */
1893 if (pi->progs->argv[0])
1894 free(pi->progs->argv[0]);
1895 pi->progs->argv[0] = *list++;
1896 #ifndef __U_BOOT__
1897 pi->progs->glob_result.gl_pathv[0] =
1898 pi->progs->argv[0];
1899 #endif
1900 }
1901 }
1902 if (rmode == RES_IN) continue;
1903 if (rmode == RES_DO) {
1904 if (!flag_rep) continue;
1905 }
1906 if ((rmode == RES_DONE)) {
1907 if (flag_rep) {
1908 flag_restore = 1;
1909 } else {
1910 rpipe = NULL;
1911 }
1912 }
1913 if (pi->num_progs == 0) continue;
1914 #ifndef __U_BOOT__
1915 save_num_progs = pi->num_progs; /* save number of programs */
1916 #endif
1917 rcode = run_pipe_real(pi);
1918 debug_printf("run_pipe_real returned %d\n",rcode);
1919 #ifndef __U_BOOT__
1920 if (rcode!=-1) {
1921 /* We only ran a builtin: rcode was set by the return value
1922 * of run_pipe_real(), and we don't need to wait for anything. */
1923 } else if (pi->followup==PIPE_BG) {
1924 /* XXX check bash's behavior with nontrivial pipes */
1925 /* XXX compute jobid */
1926 /* XXX what does bash do with attempts to background builtins? */
1927 insert_bg_job(pi);
1928 rcode = EXIT_SUCCESS;
1929 } else {
1930 if (interactive) {
1931 /* move the new process group into the foreground */
1932 if (tcsetpgrp(shell_terminal, pi->pgrp) && errno != ENOTTY)
1933 perror_msg("tcsetpgrp-3");
1934 rcode = checkjobs(pi);
1935 /* move the shell to the foreground */
1936 if (tcsetpgrp(shell_terminal, getpgid(0)) && errno != ENOTTY)
1937 perror_msg("tcsetpgrp-4");
1938 } else {
1939 rcode = checkjobs(pi);
1940 }
1941 debug_printf("checkjobs returned %d\n",rcode);
1942 }
1943 last_return_code=rcode;
1944 #else
1945 if (rcode < -1) {
1946 last_return_code = -rcode - 2;
1947 return -2; /* exit */
1948 }
1949 last_return_code=(rcode == 0) ? 0 : 1;
1950 #endif
1951 #ifndef __U_BOOT__
1952 pi->num_progs = save_num_progs; /* restore number of programs */
1953 #endif
1954 if ( rmode == RES_IF || rmode == RES_ELIF )
1955 next_if_code=rcode; /* can be overwritten a number of times */
1956 if (rmode == RES_WHILE)
1957 flag_rep = !last_return_code;
1958 if (rmode == RES_UNTIL)
1959 flag_rep = last_return_code;
1960 if ( (rcode==EXIT_SUCCESS && pi->followup==PIPE_OR) ||
1961 (rcode!=EXIT_SUCCESS && pi->followup==PIPE_AND) )
1962 skip_more_in_this_rmode=rmode;
1963 #ifndef __U_BOOT__
1964 checkjobs(NULL);
1965 #endif
1966 }
1967 return rcode;
1968 }
1969
1970 /* broken, of course, but OK for testing */
1971 static char *indenter(int i)
1972 {
1973 static char blanks[]=" ";
1974 return &blanks[sizeof(blanks)-i-1];
1975 }
1976
1977 /* return code is the exit status of the pipe */
1978 static int free_pipe(struct pipe *pi, int indent)
1979 {
1980 char **p;
1981 struct child_prog *child;
1982 #ifndef __U_BOOT__
1983 struct redir_struct *r, *rnext;
1984 #endif
1985 int a, i, ret_code=0;
1986 char *ind = indenter(indent);
1987
1988 #ifndef __U_BOOT__
1989 if (pi->stopped_progs > 0)
1990 return ret_code;
1991 final_printf("%s run pipe: (pid %d)\n",ind,getpid());
1992 #endif
1993 for (i=0; i<pi->num_progs; i++) {
1994 child = &pi->progs[i];
1995 final_printf("%s command %d:\n",ind,i);
1996 if (child->argv) {
1997 for (a=0,p=child->argv; *p; a++,p++) {
1998 final_printf("%s argv[%d] = %s\n",ind,a,*p);
1999 }
2000 #ifndef __U_BOOT__
2001 globfree(&child->glob_result);
2002 #else
2003 for (a = 0; a < child->argc; a++) {
2004 free(child->argv[a]);
2005 }
2006 free(child->argv);
2007 child->argc = 0;
2008 #endif
2009 child->argv=NULL;
2010 } else if (child->group) {
2011 #ifndef __U_BOOT__
2012 final_printf("%s begin group (subshell:%d)\n",ind, child->subshell);
2013 #endif
2014 ret_code = free_pipe_list(child->group,indent+3);
2015 final_printf("%s end group\n",ind);
2016 } else {
2017 final_printf("%s (nil)\n",ind);
2018 }
2019 #ifndef __U_BOOT__
2020 for (r=child->redirects; r; r=rnext) {
2021 final_printf("%s redirect %d%s", ind, r->fd, redir_table[r->type].descrip);
2022 if (r->dup == -1) {
2023 /* guard against the case >$FOO, where foo is unset or blank */
2024 if (r->word.gl_pathv) {
2025 final_printf(" %s\n", *r->word.gl_pathv);
2026 globfree(&r->word);
2027 }
2028 } else {
2029 final_printf("&%d\n", r->dup);
2030 }
2031 rnext=r->next;
2032 free(r);
2033 }
2034 child->redirects=NULL;
2035 #endif
2036 }
2037 free(pi->progs); /* children are an array, they get freed all at once */
2038 pi->progs=NULL;
2039 return ret_code;
2040 }
2041
2042 static int free_pipe_list(struct pipe *head, int indent)
2043 {
2044 int rcode=0; /* if list has no members */
2045 struct pipe *pi, *next;
2046 char *ind = indenter(indent);
2047 for (pi=head; pi; pi=next) {
2048 final_printf("%s pipe reserved mode %d\n", ind, pi->r_mode);
2049 rcode = free_pipe(pi, indent);
2050 final_printf("%s pipe followup code %d\n", ind, pi->followup);
2051 next=pi->next;
2052 pi->next=NULL;
2053 free(pi);
2054 }
2055 return rcode;
2056 }
2057
2058 /* Select which version we will use */
2059 static int run_list(struct pipe *pi)
2060 {
2061 int rcode=0;
2062 #ifndef __U_BOOT__
2063 if (fake_mode==0) {
2064 #endif
2065 rcode = run_list_real(pi);
2066 #ifndef __U_BOOT__
2067 }
2068 #endif
2069 /* free_pipe_list has the side effect of clearing memory
2070 * In the long run that function can be merged with run_list_real,
2071 * but doing that now would hobble the debugging effort. */
2072 free_pipe_list(pi,0);
2073 return rcode;
2074 }
2075
2076 /* The API for glob is arguably broken. This routine pushes a non-matching
2077 * string into the output structure, removing non-backslashed backslashes.
2078 * If someone can prove me wrong, by performing this function within the
2079 * original glob(3) api, feel free to rewrite this routine into oblivion.
2080 * Return code (0 vs. GLOB_NOSPACE) matches glob(3).
2081 * XXX broken if the last character is '\\', check that before calling.
2082 */
2083 #ifndef __U_BOOT__
2084 static int globhack(const char *src, int flags, glob_t *pglob)
2085 {
2086 int cnt=0, pathc;
2087 const char *s;
2088 char *dest;
2089 for (cnt=1, s=src; s && *s; s++) {
2090 if (*s == '\\') s++;
2091 cnt++;
2092 }
2093 dest = malloc(cnt);
2094 if (!dest) return GLOB_NOSPACE;
2095 if (!(flags & GLOB_APPEND)) {
2096 pglob->gl_pathv=NULL;
2097 pglob->gl_pathc=0;
2098 pglob->gl_offs=0;
2099 pglob->gl_offs=0;
2100 }
2101 pathc = ++pglob->gl_pathc;
2102 pglob->gl_pathv = realloc(pglob->gl_pathv, (pathc+1)*sizeof(*pglob->gl_pathv));
2103 if (pglob->gl_pathv == NULL) return GLOB_NOSPACE;
2104 pglob->gl_pathv[pathc-1]=dest;
2105 pglob->gl_pathv[pathc]=NULL;
2106 for (s=src; s && *s; s++, dest++) {
2107 if (*s == '\\') s++;
2108 *dest = *s;
2109 }
2110 *dest='\0';
2111 return 0;
2112 }
2113
2114 /* XXX broken if the last character is '\\', check that before calling */
2115 static int glob_needed(const char *s)
2116 {
2117 for (; *s; s++) {
2118 if (*s == '\\') s++;
2119 if (strchr("*[?",*s)) return 1;
2120 }
2121 return 0;
2122 }
2123
2124 #if 0
2125 static void globprint(glob_t *pglob)
2126 {
2127 int i;
2128 debug_printf("glob_t at %p:\n", pglob);
2129 debug_printf(" gl_pathc=%d gl_pathv=%p gl_offs=%d gl_flags=%d\n",
2130 pglob->gl_pathc, pglob->gl_pathv, pglob->gl_offs, pglob->gl_flags);
2131 for (i=0; i<pglob->gl_pathc; i++)
2132 debug_printf("pglob->gl_pathv[%d] = %p = %s\n", i,
2133 pglob->gl_pathv[i], pglob->gl_pathv[i]);
2134 }
2135 #endif
2136
2137 static int xglob(o_string *dest, int flags, glob_t *pglob)
2138 {
2139 int gr;
2140
2141 /* short-circuit for null word */
2142 /* we can code this better when the debug_printf's are gone */
2143 if (dest->length == 0) {
2144 if (dest->nonnull) {
2145 /* bash man page calls this an "explicit" null */
2146 gr = globhack(dest->data, flags, pglob);
2147 debug_printf("globhack returned %d\n",gr);
2148 } else {
2149 return 0;
2150 }
2151 } else if (glob_needed(dest->data)) {
2152 gr = glob(dest->data, flags, NULL, pglob);
2153 debug_printf("glob returned %d\n",gr);
2154 if (gr == GLOB_NOMATCH) {
2155 /* quote removal, or more accurately, backslash removal */
2156 gr = globhack(dest->data, flags, pglob);
2157 debug_printf("globhack returned %d\n",gr);
2158 }
2159 } else {
2160 gr = globhack(dest->data, flags, pglob);
2161 debug_printf("globhack returned %d\n",gr);
2162 }
2163 if (gr == GLOB_NOSPACE)
2164 error_msg_and_die("out of memory during glob");
2165 if (gr != 0) { /* GLOB_ABORTED ? */
2166 error_msg("glob(3) error %d",gr);
2167 }
2168 /* globprint(glob_target); */
2169 return gr;
2170 }
2171 #endif
2172
2173 #ifdef __U_BOOT__
2174 static char *get_dollar_var(char ch);
2175 #endif
2176
2177 /* This is used to get/check local shell variables */
2178 static char *get_local_var(const char *s)
2179 {
2180 struct variables *cur;
2181
2182 if (!s)
2183 return NULL;
2184
2185 #ifdef __U_BOOT__
2186 if (*s == '$')
2187 return get_dollar_var(s[1]);
2188 #endif
2189
2190 for (cur = top_vars; cur; cur=cur->next)
2191 if(strcmp(cur->name, s)==0)
2192 return cur->value;
2193 return NULL;
2194 }
2195
2196 /* This is used to set local shell variables
2197 flg_export==0 if only local (not exporting) variable
2198 flg_export==1 if "new" exporting environ
2199 flg_export>1 if current startup environ (not call putenv()) */
2200 int set_local_var(const char *s, int flg_export)
2201 {
2202 char *name, *value;
2203 int result=0;
2204 struct variables *cur;
2205
2206 #ifdef __U_BOOT__
2207 /* might be possible! */
2208 if (!isalpha(*s))
2209 return -1;
2210 #endif
2211
2212 name=strdup(s);
2213
2214 #ifdef __U_BOOT__
2215 if (getenv(name) != NULL) {
2216 printf ("ERROR: "
2217 "There is a global environment variable with the same name.\n");
2218 free(name);
2219 return -1;
2220 }
2221 #endif
2222 /* Assume when we enter this function that we are already in
2223 * NAME=VALUE format. So the first order of business is to
2224 * split 's' on the '=' into 'name' and 'value' */
2225 value = strchr(name, '=');
2226 if (value==0 && ++value==0) {
2227 free(name);
2228 return -1;
2229 }
2230 *value++ = 0;
2231
2232 for(cur = top_vars; cur; cur = cur->next) {
2233 if(strcmp(cur->name, name)==0)
2234 break;
2235 }
2236
2237 if(cur) {
2238 if(strcmp(cur->value, value)==0) {
2239 if(flg_export>0 && cur->flg_export==0)
2240 cur->flg_export=flg_export;
2241 else
2242 result++;
2243 } else {
2244 if(cur->flg_read_only) {
2245 error_msg("%s: readonly variable", name);
2246 result = -1;
2247 } else {
2248 if(flg_export>0 || cur->flg_export>1)
2249 cur->flg_export=1;
2250 free(cur->value);
2251
2252 cur->value = strdup(value);
2253 }
2254 }
2255 } else {
2256 cur = malloc(sizeof(struct variables));
2257 if(!cur) {
2258 result = -1;
2259 } else {
2260 cur->name = strdup(name);
2261 if(cur->name == 0) {
2262 free(cur);
2263 result = -1;
2264 } else {
2265 struct variables *bottom = top_vars;
2266 cur->value = strdup(value);
2267 cur->next = 0;
2268 cur->flg_export = flg_export;
2269 cur->flg_read_only = 0;
2270 while(bottom->next) bottom=bottom->next;
2271 bottom->next = cur;
2272 }
2273 }
2274 }
2275
2276 #ifndef __U_BOOT__
2277 if(result==0 && cur->flg_export==1) {
2278 *(value-1) = '=';
2279 result = putenv(name);
2280 } else {
2281 #endif
2282 free(name);
2283 #ifndef __U_BOOT__
2284 if(result>0) /* equivalent to previous set */
2285 result = 0;
2286 }
2287 #endif
2288 return result;
2289 }
2290
2291 void unset_local_var(const char *name)
2292 {
2293 struct variables *cur;
2294
2295 if (name) {
2296 for (cur = top_vars; cur; cur=cur->next) {
2297 if(strcmp(cur->name, name)==0)
2298 break;
2299 }
2300 if(cur!=0) {
2301 struct variables *next = top_vars;
2302 if(cur->flg_read_only) {
2303 error_msg("%s: readonly variable", name);
2304 return;
2305 } else {
2306 #ifndef __U_BOOT__
2307 if(cur->flg_export)
2308 unsetenv(cur->name);
2309 #endif
2310 free(cur->name);
2311 free(cur->value);
2312 while (next->next != cur)
2313 next = next->next;
2314 next->next = cur->next;
2315 }
2316 free(cur);
2317 }
2318 }
2319 }
2320
2321 static int is_assignment(const char *s)
2322 {
2323 if (s == NULL)
2324 return 0;
2325
2326 if (!isalpha(*s)) return 0;
2327 ++s;
2328 while(isalnum(*s) || *s=='_') ++s;
2329 return *s=='=';
2330 }
2331
2332 #ifndef __U_BOOT__
2333 /* the src parameter allows us to peek forward to a possible &n syntax
2334 * for file descriptor duplication, e.g., "2>&1".
2335 * Return code is 0 normally, 1 if a syntax error is detected in src.
2336 * Resource errors (in xmalloc) cause the process to exit */
2337 static int setup_redirect(struct p_context *ctx, int fd, redir_type style,
2338 struct in_str *input)
2339 {
2340 struct child_prog *child=ctx->child;
2341 struct redir_struct *redir = child->redirects;
2342 struct redir_struct *last_redir=NULL;
2343
2344 /* Create a new redir_struct and drop it onto the end of the linked list */
2345 while(redir) {
2346 last_redir=redir;
2347 redir=redir->next;
2348 }
2349 redir = xmalloc(sizeof(struct redir_struct));
2350 redir->next=NULL;
2351 redir->word.gl_pathv=NULL;
2352 if (last_redir) {
2353 last_redir->next=redir;
2354 } else {
2355 child->redirects=redir;
2356 }
2357
2358 redir->type=style;
2359 redir->fd= (fd==-1) ? redir_table[style].default_fd : fd ;
2360
2361 debug_printf("Redirect type %d%s\n", redir->fd, redir_table[style].descrip);
2362
2363 /* Check for a '2>&1' type redirect */
2364 redir->dup = redirect_dup_num(input);
2365 if (redir->dup == -2) return 1; /* syntax error */
2366 if (redir->dup != -1) {
2367 /* Erik had a check here that the file descriptor in question
2368 * is legit; I postpone that to "run time"
2369 * A "-" representation of "close me" shows up as a -3 here */
2370 debug_printf("Duplicating redirect '%d>&%d'\n", redir->fd, redir->dup);
2371 } else {
2372 /* We do _not_ try to open the file that src points to,
2373 * since we need to return and let src be expanded first.
2374 * Set ctx->pending_redirect, so we know what to do at the
2375 * end of the next parsed word.
2376 */
2377 ctx->pending_redirect = redir;
2378 }
2379 return 0;
2380 }
2381 #endif
2382
2383 struct pipe *new_pipe(void) {
2384 struct pipe *pi;
2385 pi = xmalloc(sizeof(struct pipe));
2386 pi->num_progs = 0;
2387 pi->progs = NULL;
2388 pi->next = NULL;
2389 pi->followup = 0; /* invalid */
2390 pi->r_mode = RES_NONE;
2391 return pi;
2392 }
2393
2394 static void initialize_context(struct p_context *ctx)
2395 {
2396 ctx->pipe=NULL;
2397 #ifndef __U_BOOT__
2398 ctx->pending_redirect=NULL;
2399 #endif
2400 ctx->child=NULL;
2401 ctx->list_head=new_pipe();
2402 ctx->pipe=ctx->list_head;
2403 ctx->w=RES_NONE;
2404 ctx->stack=NULL;
2405 #ifdef __U_BOOT__
2406 ctx->old_flag=0;
2407 #endif
2408 done_command(ctx); /* creates the memory for working child */
2409 }
2410
2411 /* normal return is 0
2412 * if a reserved word is found, and processed, return 1
2413 * should handle if, then, elif, else, fi, for, while, until, do, done.
2414 * case, function, and select are obnoxious, save those for later.
2415 */
2416 struct reserved_combo {
2417 char *literal;
2418 int code;
2419 long flag;
2420 };
2421 /* Mostly a list of accepted follow-up reserved words.
2422 * FLAG_END means we are done with the sequence, and are ready
2423 * to turn the compound list into a command.
2424 * FLAG_START means the word must start a new compound list.
2425 */
2426 static struct reserved_combo reserved_list[] = {
2427 { "if", RES_IF, FLAG_THEN | FLAG_START },
2428 { "then", RES_THEN, FLAG_ELIF | FLAG_ELSE | FLAG_FI },
2429 { "elif", RES_ELIF, FLAG_THEN },
2430 { "else", RES_ELSE, FLAG_FI },
2431 { "fi", RES_FI, FLAG_END },
2432 { "for", RES_FOR, FLAG_IN | FLAG_START },
2433 { "while", RES_WHILE, FLAG_DO | FLAG_START },
2434 { "until", RES_UNTIL, FLAG_DO | FLAG_START },
2435 { "in", RES_IN, FLAG_DO },
2436 { "do", RES_DO, FLAG_DONE },
2437 { "done", RES_DONE, FLAG_END }
2438 };
2439 #define NRES (sizeof(reserved_list)/sizeof(struct reserved_combo))
2440
2441 int reserved_word(o_string *dest, struct p_context *ctx)
2442 {
2443 struct reserved_combo *r;
2444 for (r=reserved_list;
2445 r<reserved_list+NRES; r++) {
2446 if (strcmp(dest->data, r->literal) == 0) {
2447 debug_printf("found reserved word %s, code %d\n",r->literal,r->code);
2448 if (r->flag & FLAG_START) {
2449 struct p_context *new = xmalloc(sizeof(struct p_context));
2450 debug_printf("push stack\n");
2451 if (ctx->w == RES_IN || ctx->w == RES_FOR) {
2452 syntax();
2453 free(new);
2454 ctx->w = RES_SNTX;
2455 b_reset(dest);
2456 return 1;
2457 }
2458 *new = *ctx; /* physical copy */
2459 initialize_context(ctx);
2460 ctx->stack=new;
2461 } else if ( ctx->w == RES_NONE || ! (ctx->old_flag & (1<<r->code))) {
2462 syntax();
2463 ctx->w = RES_SNTX;
2464 b_reset(dest);
2465 return 1;
2466 }
2467 ctx->w=r->code;
2468 ctx->old_flag = r->flag;
2469 if (ctx->old_flag & FLAG_END) {
2470 struct p_context *old;
2471 debug_printf("pop stack\n");
2472 done_pipe(ctx,PIPE_SEQ);
2473 old = ctx->stack;
2474 old->child->group = ctx->list_head;
2475 #ifndef __U_BOOT__
2476 old->child->subshell = 0;
2477 #endif
2478 *ctx = *old; /* physical copy */
2479 free(old);
2480 }
2481 b_reset (dest);
2482 return 1;
2483 }
2484 }
2485 return 0;
2486 }
2487
2488 /* normal return is 0.
2489 * Syntax or xglob errors return 1. */
2490 static int done_word(o_string *dest, struct p_context *ctx)
2491 {
2492 struct child_prog *child=ctx->child;
2493 #ifndef __U_BOOT__
2494 glob_t *glob_target;
2495 int gr, flags = 0;
2496 #else
2497 char *str, *s;
2498 int argc, cnt;
2499 #endif
2500
2501 debug_printf("done_word: %s %p\n", dest->data, child);
2502 if (dest->length == 0 && !dest->nonnull) {
2503 debug_printf(" true null, ignored\n");
2504 return 0;
2505 }
2506 #ifndef __U_BOOT__
2507 if (ctx->pending_redirect) {
2508 glob_target = &ctx->pending_redirect->word;
2509 } else {
2510 #endif
2511 if (child->group) {
2512 syntax();
2513 return 1; /* syntax error, groups and arglists don't mix */
2514 }
2515 if (!child->argv && (ctx->type & FLAG_PARSE_SEMICOLON)) {
2516 debug_printf("checking %s for reserved-ness\n",dest->data);
2517 if (reserved_word(dest,ctx)) return ctx->w==RES_SNTX;
2518 }
2519 #ifndef __U_BOOT__
2520 glob_target = &child->glob_result;
2521 if (child->argv) flags |= GLOB_APPEND;
2522 #else
2523 for (cnt = 1, s = dest->data; s && *s; s++) {
2524 if (*s == '\\') s++;
2525 cnt++;
2526 }
2527 str = malloc(cnt);
2528 if (!str) return 1;
2529 if ( child->argv == NULL) {
2530 child->argc=0;
2531 }
2532 argc = ++child->argc;
2533 child->argv = realloc(child->argv, (argc+1)*sizeof(*child->argv));
2534 if (child->argv == NULL) return 1;
2535 child->argv[argc-1]=str;
2536 child->argv[argc]=NULL;
2537 for (s = dest->data; s && *s; s++,str++) {
2538 if (*s == '\\') s++;
2539 *str = *s;
2540 }
2541 *str = '\0';
2542 #endif
2543 #ifndef __U_BOOT__
2544 }
2545 gr = xglob(dest, flags, glob_target);
2546 if (gr != 0) return 1;
2547 #endif
2548
2549 b_reset(dest);
2550 #ifndef __U_BOOT__
2551 if (ctx->pending_redirect) {
2552 ctx->pending_redirect=NULL;
2553 if (glob_target->gl_pathc != 1) {
2554 error_msg("ambiguous redirect");
2555 return 1;
2556 }
2557 } else {
2558 child->argv = glob_target->gl_pathv;
2559 }
2560 #endif
2561 if (ctx->w == RES_FOR) {
2562 done_word(dest,ctx);
2563 done_pipe(ctx,PIPE_SEQ);
2564 }
2565 return 0;
2566 }
2567
2568 /* The only possible error here is out of memory, in which case
2569 * xmalloc exits. */
2570 static int done_command(struct p_context *ctx)
2571 {
2572 /* The child is really already in the pipe structure, so
2573 * advance the pipe counter and make a new, null child.
2574 * Only real trickiness here is that the uncommitted
2575 * child structure, to which ctx->child points, is not
2576 * counted in pi->num_progs. */
2577 struct pipe *pi=ctx->pipe;
2578 struct child_prog *prog=ctx->child;
2579
2580 if (prog && prog->group == NULL
2581 && prog->argv == NULL
2582 #ifndef __U_BOOT__
2583 && prog->redirects == NULL) {
2584 #else
2585 ) {
2586 #endif
2587 debug_printf("done_command: skipping null command\n");
2588 return 0;
2589 } else if (prog) {
2590 pi->num_progs++;
2591 debug_printf("done_command: num_progs incremented to %d\n",pi->num_progs);
2592 } else {
2593 debug_printf("done_command: initializing\n");
2594 }
2595 pi->progs = xrealloc(pi->progs, sizeof(*pi->progs) * (pi->num_progs+1));
2596
2597 prog = pi->progs + pi->num_progs;
2598 #ifndef __U_BOOT__
2599 prog->redirects = NULL;
2600 #endif
2601 prog->argv = NULL;
2602 #ifndef __U_BOOT__
2603 prog->is_stopped = 0;
2604 #endif
2605 prog->group = NULL;
2606 #ifndef __U_BOOT__
2607 prog->glob_result.gl_pathv = NULL;
2608 prog->family = pi;
2609 #endif
2610 prog->sp = 0;
2611 ctx->child = prog;
2612 prog->type = ctx->type;
2613
2614 /* but ctx->pipe and ctx->list_head remain unchanged */
2615 return 0;
2616 }
2617
2618 static int done_pipe(struct p_context *ctx, pipe_style type)
2619 {
2620 struct pipe *new_p;
2621 done_command(ctx); /* implicit closure of previous command */
2622 debug_printf("done_pipe, type %d\n", type);
2623 ctx->pipe->followup = type;
2624 ctx->pipe->r_mode = ctx->w;
2625 new_p=new_pipe();
2626 ctx->pipe->next = new_p;
2627 ctx->pipe = new_p;
2628 ctx->child = NULL;
2629 done_command(ctx); /* set up new pipe to accept commands */
2630 return 0;
2631 }
2632
2633 #ifndef __U_BOOT__
2634 /* peek ahead in the in_str to find out if we have a "&n" construct,
2635 * as in "2>&1", that represents duplicating a file descriptor.
2636 * returns either -2 (syntax error), -1 (no &), or the number found.
2637 */
2638 static int redirect_dup_num(struct in_str *input)
2639 {
2640 int ch, d=0, ok=0;
2641 ch = b_peek(input);
2642 if (ch != '&') return -1;
2643
2644 b_getch(input); /* get the & */
2645 ch=b_peek(input);
2646 if (ch == '-') {
2647 b_getch(input);
2648 return -3; /* "-" represents "close me" */
2649 }
2650 while (isdigit(ch)) {
2651 d = d*10+(ch-'0');
2652 ok=1;
2653 b_getch(input);
2654 ch = b_peek(input);
2655 }
2656 if (ok) return d;
2657
2658 error_msg("ambiguous redirect");
2659 return -2;
2660 }
2661
2662 /* If a redirect is immediately preceded by a number, that number is
2663 * supposed to tell which file descriptor to redirect. This routine
2664 * looks for such preceding numbers. In an ideal world this routine
2665 * needs to handle all the following classes of redirects...
2666 * echo 2>foo # redirects fd 2 to file "foo", nothing passed to echo
2667 * echo 49>foo # redirects fd 49 to file "foo", nothing passed to echo
2668 * echo -2>foo # redirects fd 1 to file "foo", "-2" passed to echo
2669 * echo 49x>foo # redirects fd 1 to file "foo", "49x" passed to echo
2670 * A -1 output from this program means no valid number was found, so the
2671 * caller should use the appropriate default for this redirection.
2672 */
2673 static int redirect_opt_num(o_string *o)
2674 {
2675 int num;
2676
2677 if (o->length==0) return -1;
2678 for(num=0; num<o->length; num++) {
2679 if (!isdigit(*(o->data+num))) {
2680 return -1;
2681 }
2682 }
2683 /* reuse num (and save an int) */
2684 num=atoi(o->data);
2685 b_reset(o);
2686 return num;
2687 }
2688
2689 FILE *generate_stream_from_list(struct pipe *head)
2690 {
2691 FILE *pf;
2692 #if 1
2693 int pid, channel[2];
2694 if (pipe(channel)<0) perror_msg_and_die("pipe");
2695 pid=fork();
2696 if (pid<0) {
2697 perror_msg_and_die("fork");
2698 } else if (pid==0) {
2699 close(channel[0]);
2700 if (channel[1] != 1) {
2701 dup2(channel[1],1);
2702 close(channel[1]);
2703 }
2704 #if 0
2705 #define SURROGATE "surrogate response"
2706 write(1,SURROGATE,sizeof(SURROGATE));
2707 _exit(run_list(head));
2708 #else
2709 _exit(run_list_real(head)); /* leaks memory */
2710 #endif
2711 }
2712 debug_printf("forked child %d\n",pid);
2713 close(channel[1]);
2714 pf = fdopen(channel[0],"r");
2715 debug_printf("pipe on FILE *%p\n",pf);
2716 #else
2717 free_pipe_list(head,0);
2718 pf=popen("echo surrogate response","r");
2719 debug_printf("started fake pipe on FILE *%p\n",pf);
2720 #endif
2721 return pf;
2722 }
2723
2724 /* this version hacked for testing purposes */
2725 /* return code is exit status of the process that is run. */
2726 static int process_command_subs(o_string *dest, struct p_context *ctx, struct in_str *input, int subst_end)
2727 {
2728 int retcode;
2729 o_string result=NULL_O_STRING;
2730 struct p_context inner;
2731 FILE *p;
2732 struct in_str pipe_str;
2733 initialize_context(&inner);
2734
2735 /* recursion to generate command */
2736 retcode = parse_stream(&result, &inner, input, subst_end);
2737 if (retcode != 0) return retcode; /* syntax error or EOF */
2738 done_word(&result, &inner);
2739 done_pipe(&inner, PIPE_SEQ);
2740 b_free(&result);
2741
2742 p=generate_stream_from_list(inner.list_head);
2743 if (p==NULL) return 1;
2744 mark_open(fileno(p));
2745 setup_file_in_str(&pipe_str, p);
2746
2747 /* now send results of command back into original context */
2748 retcode = parse_stream(dest, ctx, &pipe_str, '\0');
2749 /* XXX In case of a syntax error, should we try to kill the child?
2750 * That would be tough to do right, so just read until EOF. */
2751 if (retcode == 1) {
2752 while (b_getch(&pipe_str)!=EOF) { /* discard */ };
2753 }
2754
2755 debug_printf("done reading from pipe, pclose()ing\n");
2756 /* This is the step that wait()s for the child. Should be pretty
2757 * safe, since we just read an EOF from its stdout. We could try
2758 * to better, by using wait(), and keeping track of background jobs
2759 * at the same time. That would be a lot of work, and contrary
2760 * to the KISS philosophy of this program. */
2761 mark_closed(fileno(p));
2762 retcode=pclose(p);
2763 free_pipe_list(inner.list_head,0);
2764 debug_printf("pclosed, retcode=%d\n",retcode);
2765 /* XXX this process fails to trim a single trailing newline */
2766 return retcode;
2767 }
2768
2769 static int parse_group(o_string *dest, struct p_context *ctx,
2770 struct in_str *input, int ch)
2771 {
2772 int rcode, endch=0;
2773 struct p_context sub;
2774 struct child_prog *child = ctx->child;
2775 if (child->argv) {
2776 syntax();
2777 return 1; /* syntax error, groups and arglists don't mix */
2778 }
2779 initialize_context(&sub);
2780 switch(ch) {
2781 case '(': endch=')'; child->subshell=1; break;
2782 case '{': endch='}'; break;
2783 default: syntax(); /* really logic error */
2784 }
2785 rcode=parse_stream(dest,&sub,input,endch);
2786 done_word(dest,&sub); /* finish off the final word in the subcontext */
2787 done_pipe(&sub, PIPE_SEQ); /* and the final command there, too */
2788 child->group = sub.list_head;
2789 return rcode;
2790 /* child remains "open", available for possible redirects */
2791 }
2792 #endif
2793
2794 /* basically useful version until someone wants to get fancier,
2795 * see the bash man page under "Parameter Expansion" */
2796 static char *lookup_param(char *src)
2797 {
2798 char *p;
2799
2800 if (!src)
2801 return NULL;
2802
2803 p = getenv(src);
2804 if (!p)
2805 p = get_local_var(src);
2806
2807 return p;
2808 }
2809
2810 #ifdef __U_BOOT__
2811 static char *get_dollar_var(char ch)
2812 {
2813 static char buf[40];
2814
2815 buf[0] = '\0';
2816 switch (ch) {
2817 case '?':
2818 sprintf(buf, "%u", (unsigned int)last_return_code);
2819 break;
2820 default:
2821 return NULL;
2822 }
2823 return buf;
2824 }
2825 #endif
2826
2827 /* return code: 0 for OK, 1 for syntax error */
2828 static int handle_dollar(o_string *dest, struct p_context *ctx, struct in_str *input)
2829 {
2830 #ifndef __U_BOOT__
2831 int i, advance=0;
2832 #else
2833 int advance=0;
2834 #endif
2835 #ifndef __U_BOOT__
2836 char sep[]=" ";
2837 #endif
2838 int ch = input->peek(input); /* first character after the $ */
2839 debug_printf("handle_dollar: ch=%c\n",ch);
2840 if (isalpha(ch)) {
2841 b_addchr(dest, SPECIAL_VAR_SYMBOL);
2842 ctx->child->sp++;
2843 while(ch=b_peek(input),isalnum(ch) || ch=='_') {
2844 b_getch(input);
2845 b_addchr(dest,ch);
2846 }
2847 b_addchr(dest, SPECIAL_VAR_SYMBOL);
2848 #ifndef __U_BOOT__
2849 } else if (isdigit(ch)) {
2850 i = ch-'0'; /* XXX is $0 special? */
2851 if (i<global_argc) {
2852 parse_string(dest, ctx, global_argv[i]); /* recursion */
2853 }
2854 advance = 1;
2855 #endif
2856 } else switch (ch) {
2857 #ifndef __U_BOOT__
2858 case '$':
2859 b_adduint(dest,getpid());
2860 advance = 1;
2861 break;
2862 case '!':
2863 if (last_bg_pid > 0) b_adduint(dest, last_bg_pid);
2864 advance = 1;
2865 break;
2866 #endif
2867 case '?':
2868 #ifndef __U_BOOT__
2869 b_adduint(dest,last_return_code);
2870 #else
2871 ctx->child->sp++;
2872 b_addchr(dest, SPECIAL_VAR_SYMBOL);
2873 b_addchr(dest, '$');
2874 b_addchr(dest, '?');
2875 b_addchr(dest, SPECIAL_VAR_SYMBOL);
2876 #endif
2877 advance = 1;
2878 break;
2879 #ifndef __U_BOOT__
2880 case '#':
2881 b_adduint(dest,global_argc ? global_argc-1 : 0);
2882 advance = 1;
2883 break;
2884 #endif
2885 case '{':
2886 b_addchr(dest, SPECIAL_VAR_SYMBOL);
2887 ctx->child->sp++;
2888 b_getch(input);
2889 /* XXX maybe someone will try to escape the '}' */
2890 while(ch=b_getch(input),ch!=EOF && ch!='}') {
2891 b_addchr(dest,ch);
2892 }
2893 if (ch != '}') {
2894 syntax();
2895 return 1;
2896 }
2897 b_addchr(dest, SPECIAL_VAR_SYMBOL);
2898 break;
2899 #ifndef __U_BOOT__
2900 case '(':
2901 b_getch(input);
2902 process_command_subs(dest, ctx, input, ')');
2903 break;
2904 case '*':
2905 sep[0]=ifs[0];
2906 for (i=1; i<global_argc; i++) {
2907 parse_string(dest, ctx, global_argv[i]);
2908 if (i+1 < global_argc) parse_string(dest, ctx, sep);
2909 }
2910 break;
2911 case '@':
2912 case '-':
2913 case '_':
2914 /* still unhandled, but should be eventually */
2915 error_msg("unhandled syntax: $%c",ch);
2916 return 1;
2917 break;
2918 #endif
2919 default:
2920 b_addqchr(dest,'$',dest->quote);
2921 }
2922 /* Eat the character if the flag was set. If the compiler
2923 * is smart enough, we could substitute "b_getch(input);"
2924 * for all the "advance = 1;" above, and also end up with
2925 * a nice size-optimized program. Hah! That'll be the day.
2926 */
2927 if (advance) b_getch(input);
2928 return 0;
2929 }
2930
2931 #ifndef __U_BOOT__
2932 int parse_string(o_string *dest, struct p_context *ctx, const char *src)
2933 {
2934 struct in_str foo;
2935 setup_string_in_str(&foo, src);
2936 return parse_stream(dest, ctx, &foo, '\0');
2937 }
2938 #endif
2939
2940 /* return code is 0 for normal exit, 1 for syntax error */
2941 int parse_stream(o_string *dest, struct p_context *ctx,
2942 struct in_str *input, int end_trigger)
2943 {
2944 unsigned int ch, m;
2945 #ifndef __U_BOOT__
2946 int redir_fd;
2947 redir_type redir_style;
2948 #endif
2949 int next;
2950
2951 /* Only double-quote state is handled in the state variable dest->quote.
2952 * A single-quote triggers a bypass of the main loop until its mate is
2953 * found. When recursing, quote state is passed in via dest->quote. */
2954
2955 debug_printf("parse_stream, end_trigger=%d\n",end_trigger);
2956 while ((ch=b_getch(input))!=EOF) {
2957 m = map[ch];
2958 #ifdef __U_BOOT__
2959 if (input->__promptme == 0) return 1;
2960 #endif
2961 next = (ch == '\n') ? 0 : b_peek(input);
2962
2963 debug_printf("parse_stream: ch=%c (%d) m=%d quote=%d - %c\n",
2964 ch >= ' ' ? ch : '.', ch, m,
2965 dest->quote, ctx->stack == NULL ? '*' : '.');
2966
2967 if (m==0 || ((m==1 || m==2) && dest->quote)) {
2968 b_addqchr(dest, ch, dest->quote);
2969 } else {
2970 if (m==2) { /* unquoted IFS */
2971 if (done_word(dest, ctx)) {
2972 return 1;
2973 }
2974 /* If we aren't performing a substitution, treat a newline as a
2975 * command separator. */
2976 if (end_trigger != '\0' && ch=='\n')
2977 done_pipe(ctx,PIPE_SEQ);
2978 }
2979 if (ch == end_trigger && !dest->quote && ctx->w==RES_NONE) {
2980 debug_printf("leaving parse_stream (triggered)\n");
2981 return 0;
2982 }
2983 #if 0
2984 if (ch=='\n') {
2985 /* Yahoo! Time to run with it! */
2986 done_pipe(ctx,PIPE_SEQ);
2987 run_list(ctx->list_head);
2988 initialize_context(ctx);
2989 }
2990 #endif
2991 if (m!=2) switch (ch) {
2992 case '#':
2993 if (dest->length == 0 && !dest->quote) {
2994 while(ch=b_peek(input),ch!=EOF && ch!='\n') { b_getch(input); }
2995 } else {
2996 b_addqchr(dest, ch, dest->quote);
2997 }
2998 break;
2999 case '\\':
3000 if (next == EOF) {
3001 syntax();
3002 return 1;
3003 }
3004 b_addqchr(dest, '\\', dest->quote);
3005 b_addqchr(dest, b_getch(input), dest->quote);
3006 break;
3007 case '$':
3008 if (handle_dollar(dest, ctx, input)!=0) return 1;
3009 break;
3010 case '\'':
3011 dest->nonnull = 1;
3012 while(ch=b_getch(input),ch!=EOF && ch!='\'') {
3013 #ifdef __U_BOOT__
3014 if(input->__promptme == 0) return 1;
3015 #endif
3016 b_addchr(dest,ch);
3017 }
3018 if (ch==EOF) {
3019 syntax();
3020 return 1;
3021 }
3022 break;
3023 case '"':
3024 dest->nonnull = 1;
3025 dest->quote = !dest->quote;
3026 break;
3027 #ifndef __U_BOOT__
3028 case '`':
3029 process_command_subs(dest, ctx, input, '`');
3030 break;
3031 case '>':
3032 redir_fd = redirect_opt_num(dest);
3033 done_word(dest, ctx);
3034 redir_style=REDIRECT_OVERWRITE;
3035 if (next == '>') {
3036 redir_style=REDIRECT_APPEND;
3037 b_getch(input);
3038 } else if (next == '(') {
3039 syntax(); /* until we support >(list) Process Substitution */
3040 return 1;
3041 }
3042 setup_redirect(ctx, redir_fd, redir_style, input);
3043 break;
3044 case '<':
3045 redir_fd = redirect_opt_num(dest);
3046 done_word(dest, ctx);
3047 redir_style=REDIRECT_INPUT;
3048 if (next == '<') {
3049 redir_style=REDIRECT_HEREIS;
3050 b_getch(input);
3051 } else if (next == '>') {
3052 redir_style=REDIRECT_IO;
3053 b_getch(input);
3054 } else if (next == '(') {
3055 syntax(); /* until we support <(list) Process Substitution */
3056 return 1;
3057 }
3058 setup_redirect(ctx, redir_fd, redir_style, input);
3059 break;
3060 #endif
3061 case ';':
3062 done_word(dest, ctx);
3063 done_pipe(ctx,PIPE_SEQ);
3064 break;
3065 case '&':
3066 done_word(dest, ctx);
3067 if (next=='&') {
3068 b_getch(input);
3069 done_pipe(ctx,PIPE_AND);
3070 } else {
3071 #ifndef __U_BOOT__
3072 done_pipe(ctx,PIPE_BG);
3073 #else
3074 syntax_err();
3075 return 1;
3076 #endif
3077 }
3078 break;
3079 case '|':
3080 done_word(dest, ctx);
3081 if (next=='|') {
3082 b_getch(input);
3083 done_pipe(ctx,PIPE_OR);
3084 } else {
3085 /* we could pick up a file descriptor choice here
3086 * with redirect_opt_num(), but bash doesn't do it.
3087 * "echo foo 2| cat" yields "foo 2". */
3088 #ifndef __U_BOOT__
3089 done_command(ctx);
3090 #else
3091 syntax_err();
3092 return 1;
3093 #endif
3094 }
3095 break;
3096 #ifndef __U_BOOT__
3097 case '(':
3098 case '{':
3099 if (parse_group(dest, ctx, input, ch)!=0) return 1;
3100 break;
3101 case ')':
3102 case '}':
3103 syntax(); /* Proper use of this character caught by end_trigger */
3104 return 1;
3105 break;
3106 #endif
3107 default:
3108 syntax(); /* this is really an internal logic error */
3109 return 1;
3110 }
3111 }
3112 }
3113 /* complain if quote? No, maybe we just finished a command substitution
3114 * that was quoted. Example:
3115 * $ echo "`cat foo` plus more"
3116 * and we just got the EOF generated by the subshell that ran "cat foo"
3117 * The only real complaint is if we got an EOF when end_trigger != '\0',
3118 * that is, we were really supposed to get end_trigger, and never got
3119 * one before the EOF. Can't use the standard "syntax error" return code,
3120 * so that parse_stream_outer can distinguish the EOF and exit smoothly. */
3121 debug_printf("leaving parse_stream (EOF)\n");
3122 if (end_trigger != '\0') return -1;
3123 return 0;
3124 }
3125
3126 void mapset(const unsigned char *set, int code)
3127 {
3128 const unsigned char *s;
3129 for (s=set; *s; s++) map[*s] = code;
3130 }
3131
3132 void update_ifs_map(void)
3133 {
3134 /* char *ifs and char map[256] are both globals. */
3135 ifs = (uchar *)getenv("IFS");
3136 if (ifs == NULL) ifs=(uchar *)" \t\n";
3137 /* Precompute a list of 'flow through' behavior so it can be treated
3138 * quickly up front. Computation is necessary because of IFS.
3139 * Special case handling of IFS == " \t\n" is not implemented.
3140 * The map[] array only really needs two bits each, and on most machines
3141 * that would be faster because of the reduced L1 cache footprint.
3142 */
3143 memset(map,0,sizeof(map)); /* most characters flow through always */
3144 #ifndef __U_BOOT__
3145 mapset((uchar *)"\\$'\"`", 3); /* never flow through */
3146 mapset((uchar *)"<>;&|(){}#", 1); /* flow through if quoted */
3147 #else
3148 mapset((uchar *)"\\$'\"", 3); /* never flow through */
3149 mapset((uchar *)";&|#", 1); /* flow through if quoted */
3150 #endif
3151 mapset(ifs, 2); /* also flow through if quoted */
3152 }
3153
3154 /* most recursion does not come through here, the exeception is
3155 * from builtin_source() */
3156 int parse_stream_outer(struct in_str *inp, int flag)
3157 {
3158
3159 struct p_context ctx;
3160 o_string temp=NULL_O_STRING;
3161 int rcode;
3162 #ifdef __U_BOOT__
3163 int code = 0;
3164 #endif
3165 do {
3166 ctx.type = flag;
3167 initialize_context(&ctx);
3168 update_ifs_map();
3169 if (!(flag & FLAG_PARSE_SEMICOLON) || (flag & FLAG_REPARSING)) mapset((uchar *)";$&|", 0);
3170 inp->promptmode=1;
3171 rcode = parse_stream(&temp, &ctx, inp, '\n');
3172 #ifdef __U_BOOT__
3173 if (rcode == 1) flag_repeat = 0;
3174 #endif
3175 if (rcode != 1 && ctx.old_flag != 0) {
3176 syntax();
3177 #ifdef __U_BOOT__
3178 flag_repeat = 0;
3179 #endif
3180 }
3181 if (rcode != 1 && ctx.old_flag == 0) {
3182 done_word(&temp, &ctx);
3183 done_pipe(&ctx,PIPE_SEQ);
3184 #ifndef __U_BOOT__
3185 run_list(ctx.list_head);
3186 #else
3187 code = run_list(ctx.list_head);
3188 if (code == -2) { /* exit */
3189 b_free(&temp);
3190 code = 0;
3191 /* XXX hackish way to not allow exit from main loop */
3192 if (inp->peek == file_peek) {
3193 printf("exit not allowed from main input shell.\n");
3194 continue;
3195 }
3196 break;
3197 }
3198 if (code == -1)
3199 flag_repeat = 0;
3200 #endif
3201 } else {
3202 if (ctx.old_flag != 0) {
3203 free(ctx.stack);
3204 b_reset(&temp);
3205 }
3206 #ifdef __U_BOOT__
3207 if (inp->__promptme == 0) printf("<INTERRUPT>\n");
3208 inp->__promptme = 1;
3209 #endif
3210 temp.nonnull = 0;
3211 temp.quote = 0;
3212 inp->p = NULL;
3213 free_pipe_list(ctx.list_head,0);
3214 }
3215 b_free(&temp);
3216 } while (rcode != -1 && !(flag & FLAG_EXIT_FROM_LOOP)); /* loop on syntax errors, return on EOF */
3217 #ifndef __U_BOOT__
3218 return 0;
3219 #else
3220 return (code != 0) ? 1 : 0;
3221 #endif /* __U_BOOT__ */
3222 }
3223
3224 #ifndef __U_BOOT__
3225 static int parse_string_outer(const char *s, int flag)
3226 #else
3227 int parse_string_outer(char *s, int flag)
3228 #endif /* __U_BOOT__ */
3229 {
3230 struct in_str input;
3231 #ifdef __U_BOOT__
3232 char *p = NULL;
3233 int rcode;
3234 if ( !s || !*s)
3235 return 1;
3236 if (!(p = strchr(s, '\n')) || *++p) {
3237 p = xmalloc(strlen(s) + 2);
3238 strcpy(p, s);
3239 strcat(p, "\n");
3240 setup_string_in_str(&input, p);
3241 rcode = parse_stream_outer(&input, flag);
3242 free(p);
3243 return rcode;
3244 } else {
3245 #endif
3246 setup_string_in_str(&input, s);
3247 return parse_stream_outer(&input, flag);
3248 #ifdef __U_BOOT__
3249 }
3250 #endif
3251 }
3252
3253 #ifndef __U_BOOT__
3254 static int parse_file_outer(FILE *f)
3255 #else
3256 int parse_file_outer(void)
3257 #endif
3258 {
3259 int rcode;
3260 struct in_str input;
3261 #ifndef __U_BOOT__
3262 setup_file_in_str(&input, f);
3263 #else
3264 setup_file_in_str(&input);
3265 #endif
3266 rcode = parse_stream_outer(&input, FLAG_PARSE_SEMICOLON);
3267 return rcode;
3268 }
3269
3270 #ifdef __U_BOOT__
3271 #ifndef CONFIG_RELOC_FIXUP_WORKS
3272 static void u_boot_hush_reloc(void)
3273 {
3274 unsigned long addr;
3275 struct reserved_combo *r;
3276
3277 for (r=reserved_list; r<reserved_list+NRES; r++) {
3278 addr = (ulong) (r->literal) + gd->reloc_off;
3279 r->literal = (char *)addr;
3280 }
3281 }
3282 #endif
3283
3284 int u_boot_hush_start(void)
3285 {
3286 if (top_vars == NULL) {
3287 top_vars = malloc(sizeof(struct variables));
3288 top_vars->name = "HUSH_VERSION";
3289 top_vars->value = "0.01";
3290 top_vars->next = 0;
3291 top_vars->flg_export = 0;
3292 top_vars->flg_read_only = 1;
3293 #ifndef CONFIG_RELOC_FIXUP_WORKS
3294 u_boot_hush_reloc();
3295 #endif
3296 }
3297 return 0;
3298 }
3299
3300 static void *xmalloc(size_t size)
3301 {
3302 void *p = NULL;
3303
3304 if (!(p = malloc(size))) {
3305 printf("ERROR : memory not allocated\n");
3306 for(;;);
3307 }
3308 return p;
3309 }
3310
3311 static void *xrealloc(void *ptr, size_t size)
3312 {
3313 void *p = NULL;
3314
3315 if (!(p = realloc(ptr, size))) {
3316 printf("ERROR : memory not allocated\n");
3317 for(;;);
3318 }
3319 return p;
3320 }
3321 #endif /* __U_BOOT__ */
3322
3323 #ifndef __U_BOOT__
3324 /* Make sure we have a controlling tty. If we get started under a job
3325 * aware app (like bash for example), make sure we are now in charge so
3326 * we don't fight over who gets the foreground */
3327 static void setup_job_control(void)
3328 {
3329 static pid_t shell_pgrp;
3330 /* Loop until we are in the foreground. */
3331 while (tcgetpgrp (shell_terminal) != (shell_pgrp = getpgrp ()))
3332 kill (- shell_pgrp, SIGTTIN);
3333
3334 /* Ignore interactive and job-control signals. */
3335 signal(SIGINT, SIG_IGN);
3336 signal(SIGQUIT, SIG_IGN);
3337 signal(SIGTERM, SIG_IGN);
3338 signal(SIGTSTP, SIG_IGN);
3339 signal(SIGTTIN, SIG_IGN);
3340 signal(SIGTTOU, SIG_IGN);
3341 signal(SIGCHLD, SIG_IGN);
3342
3343 /* Put ourselves in our own process group. */
3344 setsid();
3345 shell_pgrp = getpid ();
3346 setpgid (shell_pgrp, shell_pgrp);
3347
3348 /* Grab control of the terminal. */
3349 tcsetpgrp(shell_terminal, shell_pgrp);
3350 }
3351
3352 int hush_main(int argc, char * const *argv)
3353 {
3354 int opt;
3355 FILE *input;
3356 char **e = environ;
3357
3358 /* XXX what should these be while sourcing /etc/profile? */
3359 global_argc = argc;
3360 global_argv = argv;
3361
3362 /* (re?) initialize globals. Sometimes hush_main() ends up calling
3363 * hush_main(), therefore we cannot rely on the BSS to zero out this
3364 * stuff. Reset these to 0 every time. */
3365 ifs = NULL;
3366 /* map[] is taken care of with call to update_ifs_map() */
3367 fake_mode = 0;
3368 interactive = 0;
3369 close_me_head = NULL;
3370 last_bg_pid = 0;
3371 job_list = NULL;
3372 last_jobid = 0;
3373
3374 /* Initialize some more globals to non-zero values */
3375 set_cwd();
3376 #ifdef CONFIG_FEATURE_COMMAND_EDITING
3377 cmdedit_set_initial_prompt();
3378 #else
3379 PS1 = NULL;
3380 #endif
3381 PS2 = "> ";
3382
3383 /* initialize our shell local variables with the values
3384 * currently living in the environment */
3385 if (e) {
3386 for (; *e; e++)
3387 set_local_var(*e, 2); /* without call putenv() */
3388 }
3389
3390 last_return_code=EXIT_SUCCESS;
3391
3392
3393 if (argv[0] && argv[0][0] == '-') {
3394 debug_printf("\nsourcing /etc/profile\n");
3395 if ((input = fopen("/etc/profile", "r")) != NULL) {
3396 mark_open(fileno(input));
3397 parse_file_outer(input);
3398 mark_closed(fileno(input));
3399 fclose(input);
3400 }
3401 }
3402 input=stdin;
3403
3404 while ((opt = getopt(argc, argv, "c:xif")) > 0) {
3405 switch (opt) {
3406 case 'c':
3407 {
3408 global_argv = argv+optind;
3409 global_argc = argc-optind;
3410 opt = parse_string_outer(optarg, FLAG_PARSE_SEMICOLON);
3411 goto final_return;
3412 }
3413 break;
3414 case 'i':
3415 interactive++;
3416 break;
3417 case 'f':
3418 fake_mode++;
3419 break;
3420 default:
3421 #ifndef BB_VER
3422 fprintf(stderr, "Usage: sh [FILE]...\n"
3423 " or: sh -c command [args]...\n\n");
3424 exit(EXIT_FAILURE);
3425 #else
3426 show_usage();
3427 #endif
3428 }
3429 }
3430 /* A shell is interactive if the `-i' flag was given, or if all of
3431 * the following conditions are met:
3432 * no -c command
3433 * no arguments remaining or the -s flag given
3434 * standard input is a terminal
3435 * standard output is a terminal
3436 * Refer to Posix.2, the description of the `sh' utility. */
3437 if (argv[optind]==NULL && input==stdin &&
3438 isatty(fileno(stdin)) && isatty(fileno(stdout))) {
3439 interactive++;
3440 }
3441
3442 debug_printf("\ninteractive=%d\n", interactive);
3443 if (interactive) {
3444 /* Looks like they want an interactive shell */
3445 #ifndef CONFIG_FEATURE_SH_EXTRA_QUIET
3446 printf( "\n\n" BB_BANNER " hush - the humble shell v0.01 (testing)\n");
3447 printf( "Enter 'help' for a list of built-in commands.\n\n");
3448 #endif
3449 setup_job_control();
3450 }
3451
3452 if (argv[optind]==NULL) {
3453 opt=parse_file_outer(stdin);
3454 goto final_return;
3455 }
3456
3457 debug_printf("\nrunning script '%s'\n", argv[optind]);
3458 global_argv = argv+optind;
3459 global_argc = argc-optind;
3460 input = xfopen(argv[optind], "r");
3461 opt = parse_file_outer(input);
3462
3463 #ifdef CONFIG_FEATURE_CLEAN_UP
3464 fclose(input);
3465 if (cwd && cwd != unknown)
3466 free((char*)cwd);
3467 {
3468 struct variables *cur, *tmp;
3469 for(cur = top_vars; cur; cur = tmp) {
3470 tmp = cur->next;
3471 if (!cur->flg_read_only) {
3472 free(cur->name);
3473 free(cur->value);
3474 free(cur);
3475 }
3476 }
3477 }
3478 #endif
3479
3480 final_return:
3481 return(opt?opt:last_return_code);
3482 }
3483 #endif
3484
3485 static char *insert_var_value(char *inp)
3486 {
3487 int res_str_len = 0;
3488 int len;
3489 int done = 0;
3490 char *p, *p1, *res_str = NULL;
3491
3492 while ((p = strchr(inp, SPECIAL_VAR_SYMBOL))) {
3493 if (p != inp) {
3494 len = p - inp;
3495 res_str = xrealloc(res_str, (res_str_len + len));
3496 strncpy((res_str + res_str_len), inp, len);
3497 res_str_len += len;
3498 }
3499 inp = ++p;
3500 p = strchr(inp, SPECIAL_VAR_SYMBOL);
3501 *p = '\0';
3502 if ((p1 = lookup_param(inp))) {
3503 len = res_str_len + strlen(p1);
3504 res_str = xrealloc(res_str, (1 + len));
3505 strcpy((res_str + res_str_len), p1);
3506 res_str_len = len;
3507 }
3508 *p = SPECIAL_VAR_SYMBOL;
3509 inp = ++p;
3510 done = 1;
3511 }
3512 if (done) {
3513 res_str = xrealloc(res_str, (1 + res_str_len + strlen(inp)));
3514 strcpy((res_str + res_str_len), inp);
3515 while ((p = strchr(res_str, '\n'))) {
3516 *p = ' ';
3517 }
3518 }
3519 return (res_str == NULL) ? inp : res_str;
3520 }
3521
3522 static char **make_list_in(char **inp, char *name)
3523 {
3524 int len, i;
3525 int name_len = strlen(name);
3526 int n = 0;
3527 char **list;
3528 char *p1, *p2, *p3;
3529
3530 /* create list of variable values */
3531 list = xmalloc(sizeof(*list));
3532 for (i = 0; inp[i]; i++) {
3533 p3 = insert_var_value(inp[i]);
3534 p1 = p3;
3535 while (*p1) {
3536 if ((*p1 == ' ')) {
3537 p1++;
3538 continue;
3539 }
3540 if ((p2 = strchr(p1, ' '))) {
3541 len = p2 - p1;
3542 } else {
3543 len = strlen(p1);
3544 p2 = p1 + len;
3545 }
3546 /* we use n + 2 in realloc for list,because we add
3547 * new element and then we will add NULL element */
3548 list = xrealloc(list, sizeof(*list) * (n + 2));
3549 list[n] = xmalloc(2 + name_len + len);
3550 strcpy(list[n], name);
3551 strcat(list[n], "=");
3552 strncat(list[n], p1, len);
3553 list[n++][name_len + len + 1] = '\0';
3554 p1 = p2;
3555 }
3556 if (p3 != inp[i]) free(p3);
3557 }
3558 list[n] = NULL;
3559 return list;
3560 }
3561
3562 /* Make new string for parser */
3563 static char * make_string(char ** inp)
3564 {
3565 char *p;
3566 char *str = NULL;
3567 int n;
3568 int len = 2;
3569
3570 for (n = 0; inp[n]; n++) {
3571 p = insert_var_value(inp[n]);
3572 str = xrealloc(str, (len + strlen(p)));
3573 if (n) {
3574 strcat(str, " ");
3575 } else {
3576 *str = '\0';
3577 }
3578 strcat(str, p);
3579 len = strlen(str) + 3;
3580 if (p != inp[n]) free(p);
3581 }
3582 len = strlen(str);
3583 *(str + len) = '\n';
3584 *(str + len + 1) = '\0';
3585 return str;
3586 }
3587
3588 #ifdef __U_BOOT__
3589 int do_showvar (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
3590 {
3591 int i, k;
3592 int rcode = 0;
3593 struct variables *cur;
3594
3595 if (argc == 1) { /* Print all env variables */
3596 for (cur = top_vars; cur; cur = cur->next) {
3597 printf ("%s=%s\n", cur->name, cur->value);
3598 if (ctrlc ()) {
3599 puts ("\n ** Abort\n");
3600 return 1;
3601 }
3602 }
3603 return 0;
3604 }
3605 for (i = 1; i < argc; ++i) { /* print single env variables */
3606 char *name = argv[i];
3607
3608 k = -1;
3609 for (cur = top_vars; cur; cur = cur->next) {
3610 if(strcmp (cur->name, name) == 0) {
3611 k = 0;
3612 printf ("%s=%s\n", cur->name, cur->value);
3613 }
3614 if (ctrlc ()) {
3615 puts ("\n ** Abort\n");
3616 return 1;
3617 }
3618 }
3619 if (k < 0) {
3620 printf ("## Error: \"%s\" not defined\n", name);
3621 rcode ++;
3622 }
3623 }
3624 return rcode;
3625 }
3626
3627 U_BOOT_CMD(
3628 showvar, CONFIG_SYS_MAXARGS, 1, do_showvar,
3629 "print local hushshell variables",
3630 "\n - print values of all hushshell variables\n"
3631 "showvar name ...\n"
3632 " - print value of hushshell variable 'name'"
3633 );
3634
3635 #endif
3636 /****************************************************************************/
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