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Patches by Pantelis Antoniou, 16 Apr 2004:
[people/ms/u-boot.git] / common / hush.c
1 /* vi: set sw=4 ts=4: */
2 /*
3 * sh.c -- a prototype Bourne shell grammar parser
4 * Intended to follow the original Thompson and Ritchie
5 * "small and simple is beautiful" philosophy, which
6 * incidentally is a good match to today's BusyBox.
7 *
8 * Copyright (C) 2000,2001 Larry Doolittle <larry@doolittle.boa.org>
9 *
10 * Credits:
11 * The parser routines proper are all original material, first
12 * written Dec 2000 and Jan 2001 by Larry Doolittle.
13 * The execution engine, the builtins, and much of the underlying
14 * support has been adapted from busybox-0.49pre's lash,
15 * which is Copyright (C) 2000 by Lineo, Inc., and
16 * written by Erik Andersen <andersen@lineo.com>, <andersee@debian.org>.
17 * That, in turn, is based in part on ladsh.c, by Michael K. Johnson and
18 * Erik W. Troan, which they placed in the public domain. I don't know
19 * how much of the Johnson/Troan code has survived the repeated rewrites.
20 * Other credits:
21 * simple_itoa() was lifted from boa-0.93.15
22 * b_addchr() derived from similar w_addchar function in glibc-2.2
23 * setup_redirect(), redirect_opt_num(), and big chunks of main()
24 * and many builtins derived from contributions by Erik Andersen
25 * miscellaneous bugfixes from Matt Kraai
26 *
27 * There are two big (and related) architecture differences between
28 * this parser and the lash parser. One is that this version is
29 * actually designed from the ground up to understand nearly all
30 * of the Bourne grammar. The second, consequential change is that
31 * the parser and input reader have been turned inside out. Now,
32 * the parser is in control, and asks for input as needed. The old
33 * way had the input reader in control, and it asked for parsing to
34 * take place as needed. The new way makes it much easier to properly
35 * handle the recursion implicit in the various substitutions, especially
36 * across continuation lines.
37 *
38 * Bash grammar not implemented: (how many of these were in original sh?)
39 * $@ (those sure look like weird quoting rules)
40 * $_
41 * ! negation operator for pipes
42 * &> and >& redirection of stdout+stderr
43 * Brace Expansion
44 * Tilde Expansion
45 * fancy forms of Parameter Expansion
46 * aliases
47 * Arithmetic Expansion
48 * <(list) and >(list) Process Substitution
49 * reserved words: case, esac, select, function
50 * Here Documents ( << word )
51 * Functions
52 * Major bugs:
53 * job handling woefully incomplete and buggy
54 * reserved word execution woefully incomplete and buggy
55 * to-do:
56 * port selected bugfixes from post-0.49 busybox lash - done?
57 * finish implementing reserved words: for, while, until, do, done
58 * change { and } from special chars to reserved words
59 * builtins: break, continue, eval, return, set, trap, ulimit
60 * test magic exec
61 * handle children going into background
62 * clean up recognition of null pipes
63 * check setting of global_argc and global_argv
64 * control-C handling, probably with longjmp
65 * follow IFS rules more precisely, including update semantics
66 * figure out what to do with backslash-newline
67 * explain why we use signal instead of sigaction
68 * propagate syntax errors, die on resource errors?
69 * continuation lines, both explicit and implicit - done?
70 * memory leak finding and plugging - done?
71 * more testing, especially quoting rules and redirection
72 * document how quoting rules not precisely followed for variable assignments
73 * maybe change map[] to use 2-bit entries
74 * (eventually) remove all the printf's
75 *
76 * This program is free software; you can redistribute it and/or modify
77 * it under the terms of the GNU General Public License as published by
78 * the Free Software Foundation; either version 2 of the License, or
79 * (at your option) any later version.
80 *
81 * This program is distributed in the hope that it will be useful,
82 * but WITHOUT ANY WARRANTY; without even the implied warranty of
83 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
84 * General Public License for more details.
85 *
86 * You should have received a copy of the GNU General Public License
87 * along with this program; if not, write to the Free Software
88 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
89 */
90 #define __U_BOOT__
91 #ifdef __U_BOOT__
92 #include <malloc.h> /* malloc, free, realloc*/
93 #include <linux/ctype.h> /* isalpha, isdigit */
94 #include <common.h> /* readline */
95 #include <hush.h>
96 #include <command.h> /* find_cmd */
97 /*cmd_boot.c*/
98 extern int do_bootd (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]); /* do_bootd */
99 #endif
100 #ifdef CFG_HUSH_PARSER
101 #ifndef __U_BOOT__
102 #include <ctype.h> /* isalpha, isdigit */
103 #include <unistd.h> /* getpid */
104 #include <stdlib.h> /* getenv, atoi */
105 #include <string.h> /* strchr */
106 #include <stdio.h> /* popen etc. */
107 #include <glob.h> /* glob, of course */
108 #include <stdarg.h> /* va_list */
109 #include <errno.h>
110 #include <fcntl.h>
111 #include <getopt.h> /* should be pretty obvious */
112
113 #include <sys/stat.h> /* ulimit */
114 #include <sys/types.h>
115 #include <sys/wait.h>
116 #include <signal.h>
117
118 /* #include <dmalloc.h> */
119 /* #define DEBUG_SHELL */
120
121 #if 1
122 #include "busybox.h"
123 #include "cmdedit.h"
124 #else
125 #define applet_name "hush"
126 #include "standalone.h"
127 #define hush_main main
128 #undef CONFIG_FEATURE_SH_FANCY_PROMPT
129 #define BB_BANNER
130 #endif
131 #endif
132 #define SPECIAL_VAR_SYMBOL 03
133 #ifndef __U_BOOT__
134 #define FLAG_EXIT_FROM_LOOP 1
135 #define FLAG_PARSE_SEMICOLON (1 << 1) /* symbol ';' is special for parser */
136 #define FLAG_REPARSING (1 << 2) /* >= 2nd pass */
137
138 #endif
139
140 #ifdef __U_BOOT__
141 #define EXIT_SUCCESS 0
142 #define EOF -1
143 #define syntax() syntax_err()
144 #define xstrdup strdup
145 #define error_msg printf
146 #else
147 typedef enum {
148 REDIRECT_INPUT = 1,
149 REDIRECT_OVERWRITE = 2,
150 REDIRECT_APPEND = 3,
151 REDIRECT_HEREIS = 4,
152 REDIRECT_IO = 5
153 } redir_type;
154
155 /* The descrip member of this structure is only used to make debugging
156 * output pretty */
157 struct {int mode; int default_fd; char *descrip;} redir_table[] = {
158 { 0, 0, "()" },
159 { O_RDONLY, 0, "<" },
160 { O_CREAT|O_TRUNC|O_WRONLY, 1, ">" },
161 { O_CREAT|O_APPEND|O_WRONLY, 1, ">>" },
162 { O_RDONLY, -1, "<<" },
163 { O_RDWR, 1, "<>" }
164 };
165 #endif
166
167 typedef enum {
168 PIPE_SEQ = 1,
169 PIPE_AND = 2,
170 PIPE_OR = 3,
171 PIPE_BG = 4,
172 } pipe_style;
173
174 /* might eventually control execution */
175 typedef enum {
176 RES_NONE = 0,
177 RES_IF = 1,
178 RES_THEN = 2,
179 RES_ELIF = 3,
180 RES_ELSE = 4,
181 RES_FI = 5,
182 RES_FOR = 6,
183 RES_WHILE = 7,
184 RES_UNTIL = 8,
185 RES_DO = 9,
186 RES_DONE = 10,
187 RES_XXXX = 11,
188 RES_IN = 12,
189 RES_SNTX = 13
190 } reserved_style;
191 #define FLAG_END (1<<RES_NONE)
192 #define FLAG_IF (1<<RES_IF)
193 #define FLAG_THEN (1<<RES_THEN)
194 #define FLAG_ELIF (1<<RES_ELIF)
195 #define FLAG_ELSE (1<<RES_ELSE)
196 #define FLAG_FI (1<<RES_FI)
197 #define FLAG_FOR (1<<RES_FOR)
198 #define FLAG_WHILE (1<<RES_WHILE)
199 #define FLAG_UNTIL (1<<RES_UNTIL)
200 #define FLAG_DO (1<<RES_DO)
201 #define FLAG_DONE (1<<RES_DONE)
202 #define FLAG_IN (1<<RES_IN)
203 #define FLAG_START (1<<RES_XXXX)
204
205 /* This holds pointers to the various results of parsing */
206 struct p_context {
207 struct child_prog *child;
208 struct pipe *list_head;
209 struct pipe *pipe;
210 #ifndef __U_BOOT__
211 struct redir_struct *pending_redirect;
212 #endif
213 reserved_style w;
214 int old_flag; /* for figuring out valid reserved words */
215 struct p_context *stack;
216 int type; /* define type of parser : ";$" common or special symbol */
217 /* How about quoting status? */
218 };
219
220 #ifndef __U_BOOT__
221 struct redir_struct {
222 redir_type type; /* type of redirection */
223 int fd; /* file descriptor being redirected */
224 int dup; /* -1, or file descriptor being duplicated */
225 struct redir_struct *next; /* pointer to the next redirect in the list */
226 glob_t word; /* *word.gl_pathv is the filename */
227 };
228 #endif
229
230 struct child_prog {
231 #ifndef __U_BOOT__
232 pid_t pid; /* 0 if exited */
233 #endif
234 char **argv; /* program name and arguments */
235 #ifdef __U_BOOT__
236 int argc; /* number of program arguments */
237 #endif
238 struct pipe *group; /* if non-NULL, first in group or subshell */
239 #ifndef __U_BOOT__
240 int subshell; /* flag, non-zero if group must be forked */
241 struct redir_struct *redirects; /* I/O redirections */
242 glob_t glob_result; /* result of parameter globbing */
243 int is_stopped; /* is the program currently running? */
244 struct pipe *family; /* pointer back to the child's parent pipe */
245 #endif
246 int sp; /* number of SPECIAL_VAR_SYMBOL */
247 int type;
248 };
249
250 struct pipe {
251 #ifndef __U_BOOT__
252 int jobid; /* job number */
253 #endif
254 int num_progs; /* total number of programs in job */
255 #ifndef __U_BOOT__
256 int running_progs; /* number of programs running */
257 char *text; /* name of job */
258 char *cmdbuf; /* buffer various argv's point into */
259 pid_t pgrp; /* process group ID for the job */
260 #endif
261 struct child_prog *progs; /* array of commands in pipe */
262 struct pipe *next; /* to track background commands */
263 #ifndef __U_BOOT__
264 int stopped_progs; /* number of programs alive, but stopped */
265 int job_context; /* bitmask defining current context */
266 #endif
267 pipe_style followup; /* PIPE_BG, PIPE_SEQ, PIPE_OR, PIPE_AND */
268 reserved_style r_mode; /* supports if, for, while, until */
269 };
270
271 #ifndef __U_BOOT__
272 struct close_me {
273 int fd;
274 struct close_me *next;
275 };
276 #endif
277
278 struct variables {
279 char *name;
280 char *value;
281 int flg_export;
282 int flg_read_only;
283 struct variables *next;
284 };
285
286 /* globals, connect us to the outside world
287 * the first three support $?, $#, and $1 */
288 #ifndef __U_BOOT__
289 char **global_argv;
290 unsigned int global_argc;
291 #endif
292 unsigned int last_return_code;
293 int nesting_level;
294 #ifndef __U_BOOT__
295 extern char **environ; /* This is in <unistd.h>, but protected with __USE_GNU */
296 #endif
297
298 /* "globals" within this file */
299 static char *ifs;
300 static char map[256];
301 #ifndef __U_BOOT__
302 static int fake_mode;
303 static int interactive;
304 static struct close_me *close_me_head;
305 static const char *cwd;
306 static struct pipe *job_list;
307 static unsigned int last_bg_pid;
308 static unsigned int last_jobid;
309 static unsigned int shell_terminal;
310 static char *PS1;
311 static char *PS2;
312 struct variables shell_ver = { "HUSH_VERSION", "0.01", 1, 1, 0 };
313 struct variables *top_vars = &shell_ver;
314 #else
315 static int flag_repeat = 0;
316 static int do_repeat = 0;
317 static struct variables *top_vars = NULL ;
318 #endif /*__U_BOOT__ */
319
320 #define B_CHUNK (100)
321 #define B_NOSPAC 1
322
323 typedef struct {
324 char *data;
325 int length;
326 int maxlen;
327 int quote;
328 int nonnull;
329 } o_string;
330 #define NULL_O_STRING {NULL,0,0,0,0}
331 /* used for initialization:
332 o_string foo = NULL_O_STRING; */
333
334 /* I can almost use ordinary FILE *. Is open_memstream() universally
335 * available? Where is it documented? */
336 struct in_str {
337 const char *p;
338 #ifndef __U_BOOT__
339 char peek_buf[2];
340 #endif
341 int __promptme;
342 int promptmode;
343 #ifndef __U_BOOT__
344 FILE *file;
345 #endif
346 int (*get) (struct in_str *);
347 int (*peek) (struct in_str *);
348 };
349 #define b_getch(input) ((input)->get(input))
350 #define b_peek(input) ((input)->peek(input))
351
352 #ifndef __U_BOOT__
353 #define JOB_STATUS_FORMAT "[%d] %-22s %.40s\n"
354
355 struct built_in_command {
356 char *cmd; /* name */
357 char *descr; /* description */
358 int (*function) (struct child_prog *); /* function ptr */
359 };
360 #endif
361
362 /* This should be in utility.c */
363 #ifdef DEBUG_SHELL
364 #ifndef __U_BOOT__
365 static void debug_printf(const char *format, ...)
366 {
367 va_list args;
368 va_start(args, format);
369 vfprintf(stderr, format, args);
370 va_end(args);
371 }
372 #else
373 #define debug_printf printf /* U-Boot debug flag */
374 #endif
375 #else
376 static inline void debug_printf(const char *format, ...) { }
377 #endif
378 #define final_printf debug_printf
379
380 #ifdef __U_BOOT__
381 static void syntax_err(void) {
382 printf("syntax error\n");
383 }
384 #else
385 static void __syntax(char *file, int line) {
386 error_msg("syntax error %s:%d", file, line);
387 }
388 #define syntax() __syntax(__FILE__, __LINE__)
389 #endif
390
391 #ifdef __U_BOOT__
392 static void *xmalloc(size_t size);
393 static void *xrealloc(void *ptr, size_t size);
394 #else
395 /* Index of subroutines: */
396 /* function prototypes for builtins */
397 static int builtin_cd(struct child_prog *child);
398 static int builtin_env(struct child_prog *child);
399 static int builtin_eval(struct child_prog *child);
400 static int builtin_exec(struct child_prog *child);
401 static int builtin_exit(struct child_prog *child);
402 static int builtin_export(struct child_prog *child);
403 static int builtin_fg_bg(struct child_prog *child);
404 static int builtin_help(struct child_prog *child);
405 static int builtin_jobs(struct child_prog *child);
406 static int builtin_pwd(struct child_prog *child);
407 static int builtin_read(struct child_prog *child);
408 static int builtin_set(struct child_prog *child);
409 static int builtin_shift(struct child_prog *child);
410 static int builtin_source(struct child_prog *child);
411 static int builtin_umask(struct child_prog *child);
412 static int builtin_unset(struct child_prog *child);
413 static int builtin_not_written(struct child_prog *child);
414 #endif
415 /* o_string manipulation: */
416 static int b_check_space(o_string *o, int len);
417 static int b_addchr(o_string *o, int ch);
418 static void b_reset(o_string *o);
419 static int b_addqchr(o_string *o, int ch, int quote);
420 #ifndef __U_BOOT__
421 static int b_adduint(o_string *o, unsigned int i);
422 #endif
423 /* in_str manipulations: */
424 static int static_get(struct in_str *i);
425 static int static_peek(struct in_str *i);
426 static int file_get(struct in_str *i);
427 static int file_peek(struct in_str *i);
428 #ifndef __U_BOOT__
429 static void setup_file_in_str(struct in_str *i, FILE *f);
430 #else
431 static void setup_file_in_str(struct in_str *i);
432 #endif
433 static void setup_string_in_str(struct in_str *i, const char *s);
434 #ifndef __U_BOOT__
435 /* close_me manipulations: */
436 static void mark_open(int fd);
437 static void mark_closed(int fd);
438 static void close_all(void);
439 #endif
440 /* "run" the final data structures: */
441 static char *indenter(int i);
442 static int free_pipe_list(struct pipe *head, int indent);
443 static int free_pipe(struct pipe *pi, int indent);
444 /* really run the final data structures: */
445 #ifndef __U_BOOT__
446 static int setup_redirects(struct child_prog *prog, int squirrel[]);
447 #endif
448 static int run_list_real(struct pipe *pi);
449 #ifndef __U_BOOT__
450 static void pseudo_exec(struct child_prog *child) __attribute__ ((noreturn));
451 #endif
452 static int run_pipe_real(struct pipe *pi);
453 /* extended glob support: */
454 #ifndef __U_BOOT__
455 static int globhack(const char *src, int flags, glob_t *pglob);
456 static int glob_needed(const char *s);
457 static int xglob(o_string *dest, int flags, glob_t *pglob);
458 #endif
459 /* variable assignment: */
460 static int is_assignment(const char *s);
461 /* data structure manipulation: */
462 #ifndef __U_BOOT__
463 static int setup_redirect(struct p_context *ctx, int fd, redir_type style, struct in_str *input);
464 #endif
465 static void initialize_context(struct p_context *ctx);
466 static int done_word(o_string *dest, struct p_context *ctx);
467 static int done_command(struct p_context *ctx);
468 static int done_pipe(struct p_context *ctx, pipe_style type);
469 /* primary string parsing: */
470 #ifndef __U_BOOT__
471 static int redirect_dup_num(struct in_str *input);
472 static int redirect_opt_num(o_string *o);
473 static int process_command_subs(o_string *dest, struct p_context *ctx, struct in_str *input, int subst_end);
474 static int parse_group(o_string *dest, struct p_context *ctx, struct in_str *input, int ch);
475 #endif
476 static char *lookup_param(char *src);
477 static char *make_string(char **inp);
478 static int handle_dollar(o_string *dest, struct p_context *ctx, struct in_str *input);
479 #ifndef __U_BOOT__
480 static int parse_string(o_string *dest, struct p_context *ctx, const char *src);
481 #endif
482 static int parse_stream(o_string *dest, struct p_context *ctx, struct in_str *input0, int end_trigger);
483 /* setup: */
484 static int parse_stream_outer(struct in_str *inp, int flag);
485 #ifndef __U_BOOT__
486 static int parse_string_outer(const char *s, int flag);
487 static int parse_file_outer(FILE *f);
488 #endif
489 #ifndef __U_BOOT__
490 /* job management: */
491 static int checkjobs(struct pipe* fg_pipe);
492 static void insert_bg_job(struct pipe *pi);
493 static void remove_bg_job(struct pipe *pi);
494 #endif
495 /* local variable support */
496 static char **make_list_in(char **inp, char *name);
497 static char *insert_var_value(char *inp);
498 static char *get_local_var(const char *var);
499 #ifndef __U_BOOT__
500 static void unset_local_var(const char *name);
501 #endif
502 static int set_local_var(const char *s, int flg_export);
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[CFG_CBSIZE];
1022 int n;
1023 static char the_command[CFG_CBSIZE];
1024
1025 i->__promptme = 1;
1026 if (i->promptmode == 1) {
1027 n = readline(CFG_PROMPT);
1028 } else {
1029 n = readline(CFG_PROMPT_HUSH_PS2);
1030 }
1031 if (n == -1 ) {
1032 flag_repeat = 0;
1033 i->__promptme = 0;
1034 }
1035 n = strlen(console_buffer);
1036 console_buffer[n] = '\n';
1037 console_buffer[n+1]= '\0';
1038 if (had_ctrlc()) flag_repeat = 0;
1039 clear_ctrlc();
1040 do_repeat = 0;
1041 if (i->promptmode == 1) {
1042 if (console_buffer[0] == '\n'&& flag_repeat == 0) {
1043 strcpy(the_command,console_buffer);
1044 }
1045 else {
1046 if (console_buffer[0] != '\n') {
1047 strcpy(the_command,console_buffer);
1048 flag_repeat = 1;
1049 }
1050 else {
1051 do_repeat = 1;
1052 }
1053 }
1054 i->p = the_command;
1055 }
1056 else {
1057 if (console_buffer[0] != '\n') {
1058 if (strlen(the_command) + strlen(console_buffer)
1059 < CFG_CBSIZE) {
1060 n = strlen(the_command);
1061 the_command[n-1] = ' ';
1062 strcpy(&the_command[n],console_buffer);
1063 }
1064 else {
1065 the_command[0] = '\n';
1066 the_command[1] = '\0';
1067 flag_repeat = 0;
1068 }
1069 }
1070 if (i->__promptme == 0) {
1071 the_command[0] = '\n';
1072 the_command[1] = '\0';
1073 }
1074 i->p = console_buffer;
1075 }
1076 #endif
1077 }
1078
1079 /* This is the magic location that prints prompts
1080 * and gets data back from the user */
1081 static int file_get(struct in_str *i)
1082 {
1083 int ch;
1084
1085 ch = 0;
1086 /* If there is data waiting, eat it up */
1087 if (i->p && *i->p) {
1088 ch=*i->p++;
1089 } else {
1090 /* need to double check i->file because we might be doing something
1091 * more complicated by now, like sourcing or substituting. */
1092 #ifndef __U_BOOT__
1093 if (i->__promptme && interactive && i->file == stdin) {
1094 while(! i->p || (interactive && strlen(i->p)==0) ) {
1095 #else
1096 while(! i->p || strlen(i->p)==0 ) {
1097 #endif
1098 get_user_input(i);
1099 }
1100 i->promptmode=2;
1101 #ifndef __U_BOOT__
1102 i->__promptme = 0;
1103 #endif
1104 if (i->p && *i->p) {
1105 ch=*i->p++;
1106 }
1107 #ifndef __U_BOOT__
1108 } else {
1109 ch = fgetc(i->file);
1110 }
1111
1112 #endif
1113 debug_printf("b_getch: got a %d\n", ch);
1114 }
1115 #ifndef __U_BOOT__
1116 if (ch == '\n') i->__promptme=1;
1117 #endif
1118 return ch;
1119 }
1120
1121 /* All the callers guarantee this routine will never be
1122 * used right after a newline, so prompting is not needed.
1123 */
1124 static int file_peek(struct in_str *i)
1125 {
1126 #ifndef __U_BOOT__
1127 if (i->p && *i->p) {
1128 #endif
1129 return *i->p;
1130 #ifndef __U_BOOT__
1131 } else {
1132 i->peek_buf[0] = fgetc(i->file);
1133 i->peek_buf[1] = '\0';
1134 i->p = i->peek_buf;
1135 debug_printf("b_peek: got a %d\n", *i->p);
1136 return *i->p;
1137 }
1138 #endif
1139 }
1140
1141 #ifndef __U_BOOT__
1142 static void setup_file_in_str(struct in_str *i, FILE *f)
1143 #else
1144 static void setup_file_in_str(struct in_str *i)
1145 #endif
1146 {
1147 i->peek = file_peek;
1148 i->get = file_get;
1149 i->__promptme=1;
1150 i->promptmode=1;
1151 #ifndef __U_BOOT__
1152 i->file = f;
1153 #endif
1154 i->p = NULL;
1155 }
1156
1157 static void setup_string_in_str(struct in_str *i, const char *s)
1158 {
1159 i->peek = static_peek;
1160 i->get = static_get;
1161 i->__promptme=1;
1162 i->promptmode=1;
1163 i->p = s;
1164 }
1165
1166 #ifndef __U_BOOT__
1167 static void mark_open(int fd)
1168 {
1169 struct close_me *new = xmalloc(sizeof(struct close_me));
1170 new->fd = fd;
1171 new->next = close_me_head;
1172 close_me_head = new;
1173 }
1174
1175 static void mark_closed(int fd)
1176 {
1177 struct close_me *tmp;
1178 if (close_me_head == NULL || close_me_head->fd != fd)
1179 error_msg_and_die("corrupt close_me");
1180 tmp = close_me_head;
1181 close_me_head = close_me_head->next;
1182 free(tmp);
1183 }
1184
1185 static void close_all(void)
1186 {
1187 struct close_me *c;
1188 for (c=close_me_head; c; c=c->next) {
1189 close(c->fd);
1190 }
1191 close_me_head = NULL;
1192 }
1193
1194 /* squirrel != NULL means we squirrel away copies of stdin, stdout,
1195 * and stderr if they are redirected. */
1196 static int setup_redirects(struct child_prog *prog, int squirrel[])
1197 {
1198 int openfd, mode;
1199 struct redir_struct *redir;
1200
1201 for (redir=prog->redirects; redir; redir=redir->next) {
1202 if (redir->dup == -1 && redir->word.gl_pathv == NULL) {
1203 /* something went wrong in the parse. Pretend it didn't happen */
1204 continue;
1205 }
1206 if (redir->dup == -1) {
1207 mode=redir_table[redir->type].mode;
1208 openfd = open(redir->word.gl_pathv[0], mode, 0666);
1209 if (openfd < 0) {
1210 /* this could get lost if stderr has been redirected, but
1211 bash and ash both lose it as well (though zsh doesn't!) */
1212 perror_msg("error opening %s", redir->word.gl_pathv[0]);
1213 return 1;
1214 }
1215 } else {
1216 openfd = redir->dup;
1217 }
1218
1219 if (openfd != redir->fd) {
1220 if (squirrel && redir->fd < 3) {
1221 squirrel[redir->fd] = dup(redir->fd);
1222 }
1223 if (openfd == -3) {
1224 close(openfd);
1225 } else {
1226 dup2(openfd, redir->fd);
1227 if (redir->dup == -1)
1228 close (openfd);
1229 }
1230 }
1231 }
1232 return 0;
1233 }
1234
1235 static void restore_redirects(int squirrel[])
1236 {
1237 int i, fd;
1238 for (i=0; i<3; i++) {
1239 fd = squirrel[i];
1240 if (fd != -1) {
1241 /* No error checking. I sure wouldn't know what
1242 * to do with an error if I found one! */
1243 dup2(fd, i);
1244 close(fd);
1245 }
1246 }
1247 }
1248
1249 /* never returns */
1250 /* XXX no exit() here. If you don't exec, use _exit instead.
1251 * The at_exit handlers apparently confuse the calling process,
1252 * in particular stdin handling. Not sure why? */
1253 static void pseudo_exec(struct child_prog *child)
1254 {
1255 int i, rcode;
1256 char *p;
1257 struct built_in_command *x;
1258 if (child->argv) {
1259 for (i=0; is_assignment(child->argv[i]); i++) {
1260 debug_printf("pid %d environment modification: %s\n",getpid(),child->argv[i]);
1261 p = insert_var_value(child->argv[i]);
1262 putenv(strdup(p));
1263 if (p != child->argv[i]) free(p);
1264 }
1265 child->argv+=i; /* XXX this hack isn't so horrible, since we are about
1266 to exit, and therefore don't need to keep data
1267 structures consistent for free() use. */
1268 /* If a variable is assigned in a forest, and nobody listens,
1269 * was it ever really set?
1270 */
1271 if (child->argv[0] == NULL) {
1272 _exit(EXIT_SUCCESS);
1273 }
1274
1275 /*
1276 * Check if the command matches any of the builtins.
1277 * Depending on context, this might be redundant. But it's
1278 * easier to waste a few CPU cycles than it is to figure out
1279 * if this is one of those cases.
1280 */
1281 for (x = bltins; x->cmd; x++) {
1282 if (strcmp(child->argv[0], x->cmd) == 0 ) {
1283 debug_printf("builtin exec %s\n", child->argv[0]);
1284 rcode = x->function(child);
1285 fflush(stdout);
1286 _exit(rcode);
1287 }
1288 }
1289
1290 /* Check if the command matches any busybox internal commands
1291 * ("applets") here.
1292 * FIXME: This feature is not 100% safe, since
1293 * BusyBox is not fully reentrant, so we have no guarantee the things
1294 * from the .bss are still zeroed, or that things from .data are still
1295 * at their defaults. We could exec ourself from /proc/self/exe, but I
1296 * really dislike relying on /proc for things. We could exec ourself
1297 * from global_argv[0], but if we are in a chroot, we may not be able
1298 * to find ourself... */
1299 #ifdef CONFIG_FEATURE_SH_STANDALONE_SHELL
1300 {
1301 int argc_l;
1302 char** argv_l=child->argv;
1303 char *name = child->argv[0];
1304
1305 #ifdef CONFIG_FEATURE_SH_APPLETS_ALWAYS_WIN
1306 /* Following discussions from November 2000 on the busybox mailing
1307 * list, the default configuration, (without
1308 * get_last_path_component()) lets the user force use of an
1309 * external command by specifying the full (with slashes) filename.
1310 * If you enable CONFIG_FEATURE_SH_APPLETS_ALWAYS_WIN then applets
1311 * _aways_ override external commands, so if you want to run
1312 * /bin/cat, it will use BusyBox cat even if /bin/cat exists on the
1313 * filesystem and is _not_ busybox. Some systems may want this,
1314 * most do not. */
1315 name = get_last_path_component(name);
1316 #endif
1317 /* Count argc for use in a second... */
1318 for(argc_l=0;*argv_l!=NULL; argv_l++, argc_l++);
1319 optind = 1;
1320 debug_printf("running applet %s\n", name);
1321 run_applet_by_name(name, argc_l, child->argv);
1322 }
1323 #endif
1324 debug_printf("exec of %s\n",child->argv[0]);
1325 execvp(child->argv[0],child->argv);
1326 perror_msg("couldn't exec: %s",child->argv[0]);
1327 _exit(1);
1328 } else if (child->group) {
1329 debug_printf("runtime nesting to group\n");
1330 interactive=0; /* crucial!!!! */
1331 rcode = run_list_real(child->group);
1332 /* OK to leak memory by not calling free_pipe_list,
1333 * since this process is about to exit */
1334 _exit(rcode);
1335 } else {
1336 /* Can happen. See what bash does with ">foo" by itself. */
1337 debug_printf("trying to pseudo_exec null command\n");
1338 _exit(EXIT_SUCCESS);
1339 }
1340 }
1341
1342 static void insert_bg_job(struct pipe *pi)
1343 {
1344 struct pipe *thejob;
1345
1346 /* Linear search for the ID of the job to use */
1347 pi->jobid = 1;
1348 for (thejob = job_list; thejob; thejob = thejob->next)
1349 if (thejob->jobid >= pi->jobid)
1350 pi->jobid = thejob->jobid + 1;
1351
1352 /* add thejob to the list of running jobs */
1353 if (!job_list) {
1354 thejob = job_list = xmalloc(sizeof(*thejob));
1355 } else {
1356 for (thejob = job_list; thejob->next; thejob = thejob->next) /* nothing */;
1357 thejob->next = xmalloc(sizeof(*thejob));
1358 thejob = thejob->next;
1359 }
1360
1361 /* physically copy the struct job */
1362 memcpy(thejob, pi, sizeof(struct pipe));
1363 thejob->next = NULL;
1364 thejob->running_progs = thejob->num_progs;
1365 thejob->stopped_progs = 0;
1366 thejob->text = xmalloc(BUFSIZ); /* cmdedit buffer size */
1367
1368 /*if (pi->progs[0] && pi->progs[0].argv && pi->progs[0].argv[0]) */
1369 {
1370 char *bar=thejob->text;
1371 char **foo=pi->progs[0].argv;
1372 while(foo && *foo) {
1373 bar += sprintf(bar, "%s ", *foo++);
1374 }
1375 }
1376
1377 /* we don't wait for background thejobs to return -- append it
1378 to the list of backgrounded thejobs and leave it alone */
1379 printf("[%d] %d\n", thejob->jobid, thejob->progs[0].pid);
1380 last_bg_pid = thejob->progs[0].pid;
1381 last_jobid = thejob->jobid;
1382 }
1383
1384 /* remove a backgrounded job */
1385 static void remove_bg_job(struct pipe *pi)
1386 {
1387 struct pipe *prev_pipe;
1388
1389 if (pi == job_list) {
1390 job_list = pi->next;
1391 } else {
1392 prev_pipe = job_list;
1393 while (prev_pipe->next != pi)
1394 prev_pipe = prev_pipe->next;
1395 prev_pipe->next = pi->next;
1396 }
1397 if (job_list)
1398 last_jobid = job_list->jobid;
1399 else
1400 last_jobid = 0;
1401
1402 pi->stopped_progs = 0;
1403 free_pipe(pi, 0);
1404 free(pi);
1405 }
1406
1407 /* Checks to see if any processes have exited -- if they
1408 have, figure out why and see if a job has completed */
1409 static int checkjobs(struct pipe* fg_pipe)
1410 {
1411 int attributes;
1412 int status;
1413 int prognum = 0;
1414 struct pipe *pi;
1415 pid_t childpid;
1416
1417 attributes = WUNTRACED;
1418 if (fg_pipe==NULL) {
1419 attributes |= WNOHANG;
1420 }
1421
1422 while ((childpid = waitpid(-1, &status, attributes)) > 0) {
1423 if (fg_pipe) {
1424 int i, rcode = 0;
1425 for (i=0; i < fg_pipe->num_progs; i++) {
1426 if (fg_pipe->progs[i].pid == childpid) {
1427 if (i==fg_pipe->num_progs-1)
1428 rcode=WEXITSTATUS(status);
1429 (fg_pipe->num_progs)--;
1430 return(rcode);
1431 }
1432 }
1433 }
1434
1435 for (pi = job_list; pi; pi = pi->next) {
1436 prognum = 0;
1437 while (prognum < pi->num_progs && pi->progs[prognum].pid != childpid) {
1438 prognum++;
1439 }
1440 if (prognum < pi->num_progs)
1441 break;
1442 }
1443
1444 if(pi==NULL) {
1445 debug_printf("checkjobs: pid %d was not in our list!\n", childpid);
1446 continue;
1447 }
1448
1449 if (WIFEXITED(status) || WIFSIGNALED(status)) {
1450 /* child exited */
1451 pi->running_progs--;
1452 pi->progs[prognum].pid = 0;
1453
1454 if (!pi->running_progs) {
1455 printf(JOB_STATUS_FORMAT, pi->jobid, "Done", pi->text);
1456 remove_bg_job(pi);
1457 }
1458 } else {
1459 /* child stopped */
1460 pi->stopped_progs++;
1461 pi->progs[prognum].is_stopped = 1;
1462
1463 #if 0
1464 /* Printing this stuff is a pain, since it tends to
1465 * overwrite the prompt an inconveinient moments. So
1466 * don't do that. */
1467 if (pi->stopped_progs == pi->num_progs) {
1468 printf("\n"JOB_STATUS_FORMAT, pi->jobid, "Stopped", pi->text);
1469 }
1470 #endif
1471 }
1472 }
1473
1474 if (childpid == -1 && errno != ECHILD)
1475 perror_msg("waitpid");
1476
1477 /* move the shell to the foreground */
1478 /*if (interactive && tcsetpgrp(shell_terminal, getpgid(0))) */
1479 /* perror_msg("tcsetpgrp-2"); */
1480 return -1;
1481 }
1482
1483 /* Figure out our controlling tty, checking in order stderr,
1484 * stdin, and stdout. If check_pgrp is set, also check that
1485 * we belong to the foreground process group associated with
1486 * that tty. The value of shell_terminal is needed in order to call
1487 * tcsetpgrp(shell_terminal, ...); */
1488 void controlling_tty(int check_pgrp)
1489 {
1490 pid_t curpgrp;
1491
1492 if ((curpgrp = tcgetpgrp(shell_terminal = 2)) < 0
1493 && (curpgrp = tcgetpgrp(shell_terminal = 0)) < 0
1494 && (curpgrp = tcgetpgrp(shell_terminal = 1)) < 0)
1495 goto shell_terminal_error;
1496
1497 if (check_pgrp && curpgrp != getpgid(0))
1498 goto shell_terminal_error;
1499
1500 return;
1501
1502 shell_terminal_error:
1503 shell_terminal = -1;
1504 return;
1505 }
1506 #endif
1507
1508 /* run_pipe_real() starts all the jobs, but doesn't wait for anything
1509 * to finish. See checkjobs().
1510 *
1511 * return code is normally -1, when the caller has to wait for children
1512 * to finish to determine the exit status of the pipe. If the pipe
1513 * is a simple builtin command, however, the action is done by the
1514 * time run_pipe_real returns, and the exit code is provided as the
1515 * return value.
1516 *
1517 * The input of the pipe is always stdin, the output is always
1518 * stdout. The outpipe[] mechanism in BusyBox-0.48 lash is bogus,
1519 * because it tries to avoid running the command substitution in
1520 * subshell, when that is in fact necessary. The subshell process
1521 * now has its stdout directed to the input of the appropriate pipe,
1522 * so this routine is noticeably simpler.
1523 */
1524 static int run_pipe_real(struct pipe *pi)
1525 {
1526 int i;
1527 #ifndef __U_BOOT__
1528 int nextin, nextout;
1529 int pipefds[2]; /* pipefds[0] is for reading */
1530 struct child_prog *child;
1531 struct built_in_command *x;
1532 char *p;
1533 # if __GNUC__
1534 /* Avoid longjmp clobbering */
1535 (void) &i;
1536 (void) &nextin;
1537 (void) &nextout;
1538 (void) &child;
1539 # endif
1540 #else
1541 int nextin;
1542 int flag = do_repeat ? CMD_FLAG_REPEAT : 0;
1543 struct child_prog *child;
1544 cmd_tbl_t *cmdtp;
1545 char *p;
1546 # if __GNUC__
1547 /* Avoid longjmp clobbering */
1548 (void) &i;
1549 (void) &nextin;
1550 (void) &child;
1551 # endif
1552 #endif /* __U_BOOT__ */
1553
1554 nextin = 0;
1555 #ifndef __U_BOOT__
1556 pi->pgrp = -1;
1557 #endif
1558
1559 /* Check if this is a simple builtin (not part of a pipe).
1560 * Builtins within pipes have to fork anyway, and are handled in
1561 * pseudo_exec. "echo foo | read bar" doesn't work on bash, either.
1562 */
1563 if (pi->num_progs == 1) child = & (pi->progs[0]);
1564 #ifndef __U_BOOT__
1565 if (pi->num_progs == 1 && child->group && child->subshell == 0) {
1566 int squirrel[] = {-1, -1, -1};
1567 int rcode;
1568 debug_printf("non-subshell grouping\n");
1569 setup_redirects(child, squirrel);
1570 /* XXX could we merge code with following builtin case,
1571 * by creating a pseudo builtin that calls run_list_real? */
1572 rcode = run_list_real(child->group);
1573 restore_redirects(squirrel);
1574 #else
1575 if (pi->num_progs == 1 && child->group) {
1576 int rcode;
1577 debug_printf("non-subshell grouping\n");
1578 rcode = run_list_real(child->group);
1579 #endif
1580 return rcode;
1581 } else if (pi->num_progs == 1 && pi->progs[0].argv != NULL) {
1582 for (i=0; is_assignment(child->argv[i]); i++) { /* nothing */ }
1583 if (i!=0 && child->argv[i]==NULL) {
1584 /* assignments, but no command: set the local environment */
1585 for (i=0; child->argv[i]!=NULL; i++) {
1586
1587 /* Ok, this case is tricky. We have to decide if this is a
1588 * local variable, or an already exported variable. If it is
1589 * already exported, we have to export the new value. If it is
1590 * not exported, we need only set this as a local variable.
1591 * This junk is all to decide whether or not to export this
1592 * variable. */
1593 int export_me=0;
1594 char *name, *value;
1595 name = xstrdup(child->argv[i]);
1596 debug_printf("Local environment set: %s\n", name);
1597 value = strchr(name, '=');
1598 if (value)
1599 *value=0;
1600 #ifndef __U_BOOT__
1601 if ( get_local_var(name)) {
1602 export_me=1;
1603 }
1604 #endif
1605 free(name);
1606 p = insert_var_value(child->argv[i]);
1607 set_local_var(p, export_me);
1608 if (p != child->argv[i]) free(p);
1609 }
1610 return EXIT_SUCCESS; /* don't worry about errors in set_local_var() yet */
1611 }
1612 for (i = 0; is_assignment(child->argv[i]); i++) {
1613 p = insert_var_value(child->argv[i]);
1614 #ifndef __U_BOOT__
1615 putenv(strdup(p));
1616 #else
1617 set_local_var(p, 0);
1618 #endif
1619 if (p != child->argv[i]) {
1620 child->sp--;
1621 free(p);
1622 }
1623 }
1624 if (child->sp) {
1625 char * str = NULL;
1626
1627 str = make_string((child->argv + i));
1628 parse_string_outer(str, FLAG_EXIT_FROM_LOOP | FLAG_REPARSING);
1629 free(str);
1630 return last_return_code;
1631 }
1632 #ifndef __U_BOOT__
1633 for (x = bltins; x->cmd; x++) {
1634 if (strcmp(child->argv[i], x->cmd) == 0 ) {
1635 int squirrel[] = {-1, -1, -1};
1636 int rcode;
1637 if (x->function == builtin_exec && child->argv[i+1]==NULL) {
1638 debug_printf("magic exec\n");
1639 setup_redirects(child,NULL);
1640 return EXIT_SUCCESS;
1641 }
1642 debug_printf("builtin inline %s\n", child->argv[0]);
1643 /* XXX setup_redirects acts on file descriptors, not FILEs.
1644 * This is perfect for work that comes after exec().
1645 * Is it really safe for inline use? Experimentally,
1646 * things seem to work with glibc. */
1647 setup_redirects(child, squirrel);
1648 #else
1649 /* check ";", because ,example , argv consist from
1650 * "help;flinfo" must not execute
1651 */
1652 if (strchr(child->argv[i], ';')) {
1653 printf ("Unknown command '%s' - try 'help' or use 'run' command\n",
1654 child->argv[i]);
1655 return -1;
1656 }
1657 /* Look up command in command table */
1658
1659
1660 if ((cmdtp = find_cmd(child->argv[i])) == NULL) {
1661 printf ("Unknown command '%s' - try 'help'\n", child->argv[i]);
1662 return -1; /* give up after bad command */
1663 } else {
1664 int rcode;
1665 #if (CONFIG_COMMANDS & CFG_CMD_BOOTD)
1666 extern int do_bootd (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]);
1667
1668 /* avoid "bootd" recursion */
1669 if (cmdtp->cmd == do_bootd) {
1670 if (flag & CMD_FLAG_BOOTD) {
1671 printf ("'bootd' recursion detected\n");
1672 return -1;
1673 }
1674 else
1675 flag |= CMD_FLAG_BOOTD;
1676 }
1677 #endif /* CFG_CMD_BOOTD */
1678 /* found - check max args */
1679 if ((child->argc - i) > cmdtp->maxargs) {
1680 printf ("Usage:\n%s\n", cmdtp->usage);
1681 return -1;
1682 }
1683 #endif
1684 child->argv+=i; /* XXX horrible hack */
1685 #ifndef __U_BOOT__
1686 rcode = x->function(child);
1687 #else
1688 /* OK - call function to do the command */
1689
1690 rcode = (cmdtp->cmd)
1691 (cmdtp, flag,child->argc-i,&child->argv[i]);
1692 if ( !cmdtp->repeatable )
1693 flag_repeat = 0;
1694
1695
1696 #endif
1697 child->argv-=i; /* XXX restore hack so free() can work right */
1698 #ifndef __U_BOOT__
1699
1700 restore_redirects(squirrel);
1701 #endif
1702
1703 return rcode;
1704 }
1705 }
1706 #ifndef __U_BOOT__
1707 }
1708
1709 for (i = 0; i < pi->num_progs; i++) {
1710 child = & (pi->progs[i]);
1711
1712 /* pipes are inserted between pairs of commands */
1713 if ((i + 1) < pi->num_progs) {
1714 if (pipe(pipefds)<0) perror_msg_and_die("pipe");
1715 nextout = pipefds[1];
1716 } else {
1717 nextout=1;
1718 pipefds[0] = -1;
1719 }
1720
1721 /* XXX test for failed fork()? */
1722 if (!(child->pid = fork())) {
1723 /* Set the handling for job control signals back to the default. */
1724 signal(SIGINT, SIG_DFL);
1725 signal(SIGQUIT, SIG_DFL);
1726 signal(SIGTERM, SIG_DFL);
1727 signal(SIGTSTP, SIG_DFL);
1728 signal(SIGTTIN, SIG_DFL);
1729 signal(SIGTTOU, SIG_DFL);
1730 signal(SIGCHLD, SIG_DFL);
1731
1732 close_all();
1733
1734 if (nextin != 0) {
1735 dup2(nextin, 0);
1736 close(nextin);
1737 }
1738 if (nextout != 1) {
1739 dup2(nextout, 1);
1740 close(nextout);
1741 }
1742 if (pipefds[0]!=-1) {
1743 close(pipefds[0]); /* opposite end of our output pipe */
1744 }
1745
1746 /* Like bash, explicit redirects override pipes,
1747 * and the pipe fd is available for dup'ing. */
1748 setup_redirects(child,NULL);
1749
1750 if (interactive && pi->followup!=PIPE_BG) {
1751 /* If we (the child) win the race, put ourselves in the process
1752 * group whose leader is the first process in this pipe. */
1753 if (pi->pgrp < 0) {
1754 pi->pgrp = getpid();
1755 }
1756 if (setpgid(0, pi->pgrp) == 0) {
1757 tcsetpgrp(2, pi->pgrp);
1758 }
1759 }
1760
1761 pseudo_exec(child);
1762 }
1763
1764
1765 /* put our child in the process group whose leader is the
1766 first process in this pipe */
1767 if (pi->pgrp < 0) {
1768 pi->pgrp = child->pid;
1769 }
1770 /* Don't check for errors. The child may be dead already,
1771 * in which case setpgid returns error code EACCES. */
1772 setpgid(child->pid, pi->pgrp);
1773
1774 if (nextin != 0)
1775 close(nextin);
1776 if (nextout != 1)
1777 close(nextout);
1778
1779 /* If there isn't another process, nextin is garbage
1780 but it doesn't matter */
1781 nextin = pipefds[0];
1782 }
1783 #endif
1784 return -1;
1785 }
1786
1787 static int run_list_real(struct pipe *pi)
1788 {
1789 char *save_name = NULL;
1790 char **list = NULL;
1791 char **save_list = NULL;
1792 struct pipe *rpipe;
1793 int flag_rep = 0;
1794 #ifndef __U_BOOT__
1795 int save_num_progs;
1796 #endif
1797 int rcode=0, flag_skip=1;
1798 int flag_restore = 0;
1799 int if_code=0, next_if_code=0; /* need double-buffer to handle elif */
1800 reserved_style rmode, skip_more_in_this_rmode=RES_XXXX;
1801 /* check syntax for "for" */
1802 for (rpipe = pi; rpipe; rpipe = rpipe->next) {
1803 if ((rpipe->r_mode == RES_IN ||
1804 rpipe->r_mode == RES_FOR) &&
1805 (rpipe->next == NULL)) {
1806 syntax();
1807 #ifdef __U_BOOT__
1808 flag_repeat = 0;
1809 #endif
1810 return 1;
1811 }
1812 if ((rpipe->r_mode == RES_IN &&
1813 (rpipe->next->r_mode == RES_IN &&
1814 rpipe->next->progs->argv != NULL))||
1815 (rpipe->r_mode == RES_FOR &&
1816 rpipe->next->r_mode != RES_IN)) {
1817 syntax();
1818 #ifdef __U_BOOT__
1819 flag_repeat = 0;
1820 #endif
1821 return 1;
1822 }
1823 }
1824 for (; pi; pi = (flag_restore != 0) ? rpipe : pi->next) {
1825 if (pi->r_mode == RES_WHILE || pi->r_mode == RES_UNTIL ||
1826 pi->r_mode == RES_FOR) {
1827 #ifdef __U_BOOT__
1828 /* check Ctrl-C */
1829 ctrlc();
1830 if ((had_ctrlc())) {
1831 return 1;
1832 }
1833 #endif
1834 flag_restore = 0;
1835 if (!rpipe) {
1836 flag_rep = 0;
1837 rpipe = pi;
1838 }
1839 }
1840 rmode = pi->r_mode;
1841 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);
1842 if (rmode == skip_more_in_this_rmode && flag_skip) {
1843 if (pi->followup == PIPE_SEQ) flag_skip=0;
1844 continue;
1845 }
1846 flag_skip = 1;
1847 skip_more_in_this_rmode = RES_XXXX;
1848 if (rmode == RES_THEN || rmode == RES_ELSE) if_code = next_if_code;
1849 if (rmode == RES_THEN && if_code) continue;
1850 if (rmode == RES_ELSE && !if_code) continue;
1851 if (rmode == RES_ELIF && !if_code) break;
1852 if (rmode == RES_FOR && pi->num_progs) {
1853 if (!list) {
1854 /* if no variable values after "in" we skip "for" */
1855 if (!pi->next->progs->argv) continue;
1856 /* create list of variable values */
1857 list = make_list_in(pi->next->progs->argv,
1858 pi->progs->argv[0]);
1859 save_list = list;
1860 save_name = pi->progs->argv[0];
1861 pi->progs->argv[0] = NULL;
1862 flag_rep = 1;
1863 }
1864 if (!(*list)) {
1865 free(pi->progs->argv[0]);
1866 free(save_list);
1867 list = NULL;
1868 flag_rep = 0;
1869 pi->progs->argv[0] = save_name;
1870 #ifndef __U_BOOT__
1871 pi->progs->glob_result.gl_pathv[0] =
1872 pi->progs->argv[0];
1873 #endif
1874 continue;
1875 } else {
1876 /* insert new value from list for variable */
1877 if (pi->progs->argv[0])
1878 free(pi->progs->argv[0]);
1879 pi->progs->argv[0] = *list++;
1880 #ifndef __U_BOOT__
1881 pi->progs->glob_result.gl_pathv[0] =
1882 pi->progs->argv[0];
1883 #endif
1884 }
1885 }
1886 if (rmode == RES_IN) continue;
1887 if (rmode == RES_DO) {
1888 if (!flag_rep) continue;
1889 }
1890 if ((rmode == RES_DONE)) {
1891 if (flag_rep) {
1892 flag_restore = 1;
1893 } else {
1894 rpipe = NULL;
1895 }
1896 }
1897 if (pi->num_progs == 0) continue;
1898 #ifndef __U_BOOT__
1899 save_num_progs = pi->num_progs; /* save number of programs */
1900 #endif
1901 rcode = run_pipe_real(pi);
1902 debug_printf("run_pipe_real returned %d\n",rcode);
1903 #ifndef __U_BOOT__
1904 if (rcode!=-1) {
1905 /* We only ran a builtin: rcode was set by the return value
1906 * of run_pipe_real(), and we don't need to wait for anything. */
1907 } else if (pi->followup==PIPE_BG) {
1908 /* XXX check bash's behavior with nontrivial pipes */
1909 /* XXX compute jobid */
1910 /* XXX what does bash do with attempts to background builtins? */
1911 insert_bg_job(pi);
1912 rcode = EXIT_SUCCESS;
1913 } else {
1914 if (interactive) {
1915 /* move the new process group into the foreground */
1916 if (tcsetpgrp(shell_terminal, pi->pgrp) && errno != ENOTTY)
1917 perror_msg("tcsetpgrp-3");
1918 rcode = checkjobs(pi);
1919 /* move the shell to the foreground */
1920 if (tcsetpgrp(shell_terminal, getpgid(0)) && errno != ENOTTY)
1921 perror_msg("tcsetpgrp-4");
1922 } else {
1923 rcode = checkjobs(pi);
1924 }
1925 debug_printf("checkjobs returned %d\n",rcode);
1926 }
1927 last_return_code=rcode;
1928 #else
1929 if (rcode < -1) {
1930 last_return_code = -rcode - 2;
1931 return -2; /* exit */
1932 }
1933 last_return_code=(rcode == 0) ? 0 : 1;
1934 #endif
1935 #ifndef __U_BOOT__
1936 pi->num_progs = save_num_progs; /* restore number of programs */
1937 #endif
1938 if ( rmode == RES_IF || rmode == RES_ELIF )
1939 next_if_code=rcode; /* can be overwritten a number of times */
1940 if (rmode == RES_WHILE)
1941 flag_rep = !last_return_code;
1942 if (rmode == RES_UNTIL)
1943 flag_rep = last_return_code;
1944 if ( (rcode==EXIT_SUCCESS && pi->followup==PIPE_OR) ||
1945 (rcode!=EXIT_SUCCESS && pi->followup==PIPE_AND) )
1946 skip_more_in_this_rmode=rmode;
1947 #ifndef __U_BOOT__
1948 checkjobs(NULL);
1949 #endif
1950 }
1951 return rcode;
1952 }
1953
1954 /* broken, of course, but OK for testing */
1955 static char *indenter(int i)
1956 {
1957 static char blanks[]=" ";
1958 return &blanks[sizeof(blanks)-i-1];
1959 }
1960
1961 /* return code is the exit status of the pipe */
1962 static int free_pipe(struct pipe *pi, int indent)
1963 {
1964 char **p;
1965 struct child_prog *child;
1966 #ifndef __U_BOOT__
1967 struct redir_struct *r, *rnext;
1968 #endif
1969 int a, i, ret_code=0;
1970 char *ind = indenter(indent);
1971
1972 #ifndef __U_BOOT__
1973 if (pi->stopped_progs > 0)
1974 return ret_code;
1975 final_printf("%s run pipe: (pid %d)\n",ind,getpid());
1976 #endif
1977 for (i=0; i<pi->num_progs; i++) {
1978 child = &pi->progs[i];
1979 final_printf("%s command %d:\n",ind,i);
1980 if (child->argv) {
1981 for (a=0,p=child->argv; *p; a++,p++) {
1982 final_printf("%s argv[%d] = %s\n",ind,a,*p);
1983 }
1984 #ifndef __U_BOOT__
1985 globfree(&child->glob_result);
1986 #else
1987 for (a = child->argc;a >= 0;a--) {
1988 free(child->argv[a]);
1989 }
1990 free(child->argv);
1991 child->argc = 0;
1992 #endif
1993 child->argv=NULL;
1994 } else if (child->group) {
1995 #ifndef __U_BOOT__
1996 final_printf("%s begin group (subshell:%d)\n",ind, child->subshell);
1997 #endif
1998 ret_code = free_pipe_list(child->group,indent+3);
1999 final_printf("%s end group\n",ind);
2000 } else {
2001 final_printf("%s (nil)\n",ind);
2002 }
2003 #ifndef __U_BOOT__
2004 for (r=child->redirects; r; r=rnext) {
2005 final_printf("%s redirect %d%s", ind, r->fd, redir_table[r->type].descrip);
2006 if (r->dup == -1) {
2007 /* guard against the case >$FOO, where foo is unset or blank */
2008 if (r->word.gl_pathv) {
2009 final_printf(" %s\n", *r->word.gl_pathv);
2010 globfree(&r->word);
2011 }
2012 } else {
2013 final_printf("&%d\n", r->dup);
2014 }
2015 rnext=r->next;
2016 free(r);
2017 }
2018 child->redirects=NULL;
2019 #endif
2020 }
2021 free(pi->progs); /* children are an array, they get freed all at once */
2022 pi->progs=NULL;
2023 return ret_code;
2024 }
2025
2026 static int free_pipe_list(struct pipe *head, int indent)
2027 {
2028 int rcode=0; /* if list has no members */
2029 struct pipe *pi, *next;
2030 char *ind = indenter(indent);
2031 for (pi=head; pi; pi=next) {
2032 final_printf("%s pipe reserved mode %d\n", ind, pi->r_mode);
2033 rcode = free_pipe(pi, indent);
2034 final_printf("%s pipe followup code %d\n", ind, pi->followup);
2035 next=pi->next;
2036 pi->next=NULL;
2037 free(pi);
2038 }
2039 return rcode;
2040 }
2041
2042 /* Select which version we will use */
2043 static int run_list(struct pipe *pi)
2044 {
2045 int rcode=0;
2046 #ifndef __U_BOOT__
2047 if (fake_mode==0) {
2048 #endif
2049 rcode = run_list_real(pi);
2050 #ifndef __U_BOOT__
2051 }
2052 #endif
2053 /* free_pipe_list has the side effect of clearing memory
2054 * In the long run that function can be merged with run_list_real,
2055 * but doing that now would hobble the debugging effort. */
2056 free_pipe_list(pi,0);
2057 return rcode;
2058 }
2059
2060 /* The API for glob is arguably broken. This routine pushes a non-matching
2061 * string into the output structure, removing non-backslashed backslashes.
2062 * If someone can prove me wrong, by performing this function within the
2063 * original glob(3) api, feel free to rewrite this routine into oblivion.
2064 * Return code (0 vs. GLOB_NOSPACE) matches glob(3).
2065 * XXX broken if the last character is '\\', check that before calling.
2066 */
2067 #ifndef __U_BOOT__
2068 static int globhack(const char *src, int flags, glob_t *pglob)
2069 {
2070 int cnt=0, pathc;
2071 const char *s;
2072 char *dest;
2073 for (cnt=1, s=src; s && *s; s++) {
2074 if (*s == '\\') s++;
2075 cnt++;
2076 }
2077 dest = malloc(cnt);
2078 if (!dest) return GLOB_NOSPACE;
2079 if (!(flags & GLOB_APPEND)) {
2080 pglob->gl_pathv=NULL;
2081 pglob->gl_pathc=0;
2082 pglob->gl_offs=0;
2083 pglob->gl_offs=0;
2084 }
2085 pathc = ++pglob->gl_pathc;
2086 pglob->gl_pathv = realloc(pglob->gl_pathv, (pathc+1)*sizeof(*pglob->gl_pathv));
2087 if (pglob->gl_pathv == NULL) return GLOB_NOSPACE;
2088 pglob->gl_pathv[pathc-1]=dest;
2089 pglob->gl_pathv[pathc]=NULL;
2090 for (s=src; s && *s; s++, dest++) {
2091 if (*s == '\\') s++;
2092 *dest = *s;
2093 }
2094 *dest='\0';
2095 return 0;
2096 }
2097
2098 /* XXX broken if the last character is '\\', check that before calling */
2099 static int glob_needed(const char *s)
2100 {
2101 for (; *s; s++) {
2102 if (*s == '\\') s++;
2103 if (strchr("*[?",*s)) return 1;
2104 }
2105 return 0;
2106 }
2107
2108 #if 0
2109 static void globprint(glob_t *pglob)
2110 {
2111 int i;
2112 debug_printf("glob_t at %p:\n", pglob);
2113 debug_printf(" gl_pathc=%d gl_pathv=%p gl_offs=%d gl_flags=%d\n",
2114 pglob->gl_pathc, pglob->gl_pathv, pglob->gl_offs, pglob->gl_flags);
2115 for (i=0; i<pglob->gl_pathc; i++)
2116 debug_printf("pglob->gl_pathv[%d] = %p = %s\n", i,
2117 pglob->gl_pathv[i], pglob->gl_pathv[i]);
2118 }
2119 #endif
2120
2121 static int xglob(o_string *dest, int flags, glob_t *pglob)
2122 {
2123 int gr;
2124
2125 /* short-circuit for null word */
2126 /* we can code this better when the debug_printf's are gone */
2127 if (dest->length == 0) {
2128 if (dest->nonnull) {
2129 /* bash man page calls this an "explicit" null */
2130 gr = globhack(dest->data, flags, pglob);
2131 debug_printf("globhack returned %d\n",gr);
2132 } else {
2133 return 0;
2134 }
2135 } else if (glob_needed(dest->data)) {
2136 gr = glob(dest->data, flags, NULL, pglob);
2137 debug_printf("glob returned %d\n",gr);
2138 if (gr == GLOB_NOMATCH) {
2139 /* quote removal, or more accurately, backslash removal */
2140 gr = globhack(dest->data, flags, pglob);
2141 debug_printf("globhack returned %d\n",gr);
2142 }
2143 } else {
2144 gr = globhack(dest->data, flags, pglob);
2145 debug_printf("globhack returned %d\n",gr);
2146 }
2147 if (gr == GLOB_NOSPACE)
2148 error_msg_and_die("out of memory during glob");
2149 if (gr != 0) { /* GLOB_ABORTED ? */
2150 error_msg("glob(3) error %d",gr);
2151 }
2152 /* globprint(glob_target); */
2153 return gr;
2154 }
2155 #endif
2156
2157 #ifdef __U_BOOT__
2158 static char *get_dollar_var(char ch);
2159 #endif
2160
2161 /* This is used to get/check local shell variables */
2162 static char *get_local_var(const char *s)
2163 {
2164 struct variables *cur;
2165
2166 if (!s)
2167 return NULL;
2168
2169 #ifdef __U_BOOT__
2170 if (*s == '$')
2171 return get_dollar_var(s[1]);
2172 #endif
2173
2174 for (cur = top_vars; cur; cur=cur->next)
2175 if(strcmp(cur->name, s)==0)
2176 return cur->value;
2177 return NULL;
2178 }
2179
2180 /* This is used to set local shell variables
2181 flg_export==0 if only local (not exporting) variable
2182 flg_export==1 if "new" exporting environ
2183 flg_export>1 if current startup environ (not call putenv()) */
2184 static int set_local_var(const char *s, int flg_export)
2185 {
2186 char *name, *value;
2187 int result=0;
2188 struct variables *cur;
2189
2190 #ifdef __U_BOOT__
2191 /* might be possible! */
2192 if (!isalpha(*s))
2193 return -1;
2194 #endif
2195
2196 name=strdup(s);
2197
2198 #ifdef __U_BOOT__
2199 if (getenv(name) != NULL) {
2200 printf ("ERROR: "
2201 "There is a global environment variable with the same name.\n");
2202 free(name);
2203 return -1;
2204 }
2205 #endif
2206 /* Assume when we enter this function that we are already in
2207 * NAME=VALUE format. So the first order of business is to
2208 * split 's' on the '=' into 'name' and 'value' */
2209 value = strchr(name, '=');
2210 if (value==0 && ++value==0) {
2211 free(name);
2212 return -1;
2213 }
2214 *value++ = 0;
2215
2216 for(cur = top_vars; cur; cur = cur->next) {
2217 if(strcmp(cur->name, name)==0)
2218 break;
2219 }
2220
2221 if(cur) {
2222 if(strcmp(cur->value, value)==0) {
2223 if(flg_export>0 && cur->flg_export==0)
2224 cur->flg_export=flg_export;
2225 else
2226 result++;
2227 } else {
2228 if(cur->flg_read_only) {
2229 error_msg("%s: readonly variable", name);
2230 result = -1;
2231 } else {
2232 if(flg_export>0 || cur->flg_export>1)
2233 cur->flg_export=1;
2234 free(cur->value);
2235
2236 cur->value = strdup(value);
2237 }
2238 }
2239 } else {
2240 cur = malloc(sizeof(struct variables));
2241 if(!cur) {
2242 result = -1;
2243 } else {
2244 cur->name = strdup(name);
2245 if(cur->name == 0) {
2246 free(cur);
2247 result = -1;
2248 } else {
2249 struct variables *bottom = top_vars;
2250 cur->value = strdup(value);
2251 cur->next = 0;
2252 cur->flg_export = flg_export;
2253 cur->flg_read_only = 0;
2254 while(bottom->next) bottom=bottom->next;
2255 bottom->next = cur;
2256 }
2257 }
2258 }
2259
2260 #ifndef __U_BOOT__
2261 if(result==0 && cur->flg_export==1) {
2262 *(value-1) = '=';
2263 result = putenv(name);
2264 } else {
2265 #endif
2266 free(name);
2267 #ifndef __U_BOOT__
2268 if(result>0) /* equivalent to previous set */
2269 result = 0;
2270 }
2271 #endif
2272 return result;
2273 }
2274
2275 #ifndef __U_BOOT__
2276 static void unset_local_var(const char *name)
2277 {
2278 struct variables *cur;
2279
2280 if (name) {
2281 for (cur = top_vars; cur; cur=cur->next) {
2282 if(strcmp(cur->name, name)==0)
2283 break;
2284 }
2285 if(cur!=0) {
2286 struct variables *next = top_vars;
2287 if(cur->flg_read_only) {
2288 error_msg("%s: readonly variable", name);
2289 return;
2290 } else {
2291 if(cur->flg_export)
2292 unsetenv(cur->name);
2293 free(cur->name);
2294 free(cur->value);
2295 while (next->next != cur)
2296 next = next->next;
2297 next->next = cur->next;
2298 }
2299 free(cur);
2300 }
2301 }
2302 }
2303 #endif
2304
2305 static int is_assignment(const char *s)
2306 {
2307 if (s == NULL)
2308 return 0;
2309
2310 if (!isalpha(*s)) return 0;
2311 ++s;
2312 while(isalnum(*s) || *s=='_') ++s;
2313 return *s=='=';
2314 }
2315
2316 #ifndef __U_BOOT__
2317 /* the src parameter allows us to peek forward to a possible &n syntax
2318 * for file descriptor duplication, e.g., "2>&1".
2319 * Return code is 0 normally, 1 if a syntax error is detected in src.
2320 * Resource errors (in xmalloc) cause the process to exit */
2321 static int setup_redirect(struct p_context *ctx, int fd, redir_type style,
2322 struct in_str *input)
2323 {
2324 struct child_prog *child=ctx->child;
2325 struct redir_struct *redir = child->redirects;
2326 struct redir_struct *last_redir=NULL;
2327
2328 /* Create a new redir_struct and drop it onto the end of the linked list */
2329 while(redir) {
2330 last_redir=redir;
2331 redir=redir->next;
2332 }
2333 redir = xmalloc(sizeof(struct redir_struct));
2334 redir->next=NULL;
2335 redir->word.gl_pathv=NULL;
2336 if (last_redir) {
2337 last_redir->next=redir;
2338 } else {
2339 child->redirects=redir;
2340 }
2341
2342 redir->type=style;
2343 redir->fd= (fd==-1) ? redir_table[style].default_fd : fd ;
2344
2345 debug_printf("Redirect type %d%s\n", redir->fd, redir_table[style].descrip);
2346
2347 /* Check for a '2>&1' type redirect */
2348 redir->dup = redirect_dup_num(input);
2349 if (redir->dup == -2) return 1; /* syntax error */
2350 if (redir->dup != -1) {
2351 /* Erik had a check here that the file descriptor in question
2352 * is legit; I postpone that to "run time"
2353 * A "-" representation of "close me" shows up as a -3 here */
2354 debug_printf("Duplicating redirect '%d>&%d'\n", redir->fd, redir->dup);
2355 } else {
2356 /* We do _not_ try to open the file that src points to,
2357 * since we need to return and let src be expanded first.
2358 * Set ctx->pending_redirect, so we know what to do at the
2359 * end of the next parsed word.
2360 */
2361 ctx->pending_redirect = redir;
2362 }
2363 return 0;
2364 }
2365 #endif
2366
2367 struct pipe *new_pipe(void) {
2368 struct pipe *pi;
2369 pi = xmalloc(sizeof(struct pipe));
2370 pi->num_progs = 0;
2371 pi->progs = NULL;
2372 pi->next = NULL;
2373 pi->followup = 0; /* invalid */
2374 return pi;
2375 }
2376
2377 static void initialize_context(struct p_context *ctx)
2378 {
2379 ctx->pipe=NULL;
2380 #ifndef __U_BOOT__
2381 ctx->pending_redirect=NULL;
2382 #endif
2383 ctx->child=NULL;
2384 ctx->list_head=new_pipe();
2385 ctx->pipe=ctx->list_head;
2386 ctx->w=RES_NONE;
2387 ctx->stack=NULL;
2388 #ifdef __U_BOOT__
2389 ctx->old_flag=0;
2390 #endif
2391 done_command(ctx); /* creates the memory for working child */
2392 }
2393
2394 /* normal return is 0
2395 * if a reserved word is found, and processed, return 1
2396 * should handle if, then, elif, else, fi, for, while, until, do, done.
2397 * case, function, and select are obnoxious, save those for later.
2398 */
2399 struct reserved_combo {
2400 char *literal;
2401 int code;
2402 long flag;
2403 };
2404 /* Mostly a list of accepted follow-up reserved words.
2405 * FLAG_END means we are done with the sequence, and are ready
2406 * to turn the compound list into a command.
2407 * FLAG_START means the word must start a new compound list.
2408 */
2409 static struct reserved_combo reserved_list[] = {
2410 { "if", RES_IF, FLAG_THEN | FLAG_START },
2411 { "then", RES_THEN, FLAG_ELIF | FLAG_ELSE | FLAG_FI },
2412 { "elif", RES_ELIF, FLAG_THEN },
2413 { "else", RES_ELSE, FLAG_FI },
2414 { "fi", RES_FI, FLAG_END },
2415 { "for", RES_FOR, FLAG_IN | FLAG_START },
2416 { "while", RES_WHILE, FLAG_DO | FLAG_START },
2417 { "until", RES_UNTIL, FLAG_DO | FLAG_START },
2418 { "in", RES_IN, FLAG_DO },
2419 { "do", RES_DO, FLAG_DONE },
2420 { "done", RES_DONE, FLAG_END }
2421 };
2422 #define NRES (sizeof(reserved_list)/sizeof(struct reserved_combo))
2423
2424 int reserved_word(o_string *dest, struct p_context *ctx)
2425 {
2426 struct reserved_combo *r;
2427 for (r=reserved_list;
2428 r<reserved_list+NRES; r++) {
2429 if (strcmp(dest->data, r->literal) == 0) {
2430 debug_printf("found reserved word %s, code %d\n",r->literal,r->code);
2431 if (r->flag & FLAG_START) {
2432 struct p_context *new = xmalloc(sizeof(struct p_context));
2433 debug_printf("push stack\n");
2434 if (ctx->w == RES_IN || ctx->w == RES_FOR) {
2435 syntax();
2436 free(new);
2437 ctx->w = RES_SNTX;
2438 b_reset(dest);
2439 return 1;
2440 }
2441 *new = *ctx; /* physical copy */
2442 initialize_context(ctx);
2443 ctx->stack=new;
2444 } else if ( ctx->w == RES_NONE || ! (ctx->old_flag & (1<<r->code))) {
2445 syntax();
2446 ctx->w = RES_SNTX;
2447 b_reset(dest);
2448 return 1;
2449 }
2450 ctx->w=r->code;
2451 ctx->old_flag = r->flag;
2452 if (ctx->old_flag & FLAG_END) {
2453 struct p_context *old;
2454 debug_printf("pop stack\n");
2455 done_pipe(ctx,PIPE_SEQ);
2456 old = ctx->stack;
2457 old->child->group = ctx->list_head;
2458 #ifndef __U_BOOT__
2459 old->child->subshell = 0;
2460 #endif
2461 *ctx = *old; /* physical copy */
2462 free(old);
2463 }
2464 b_reset (dest);
2465 return 1;
2466 }
2467 }
2468 return 0;
2469 }
2470
2471 /* normal return is 0.
2472 * Syntax or xglob errors return 1. */
2473 static int done_word(o_string *dest, struct p_context *ctx)
2474 {
2475 struct child_prog *child=ctx->child;
2476 #ifndef __U_BOOT__
2477 glob_t *glob_target;
2478 int gr, flags = 0;
2479 #else
2480 char *str, *s;
2481 int argc, cnt;
2482 #endif
2483
2484 debug_printf("done_word: %s %p\n", dest->data, child);
2485 if (dest->length == 0 && !dest->nonnull) {
2486 debug_printf(" true null, ignored\n");
2487 return 0;
2488 }
2489 #ifndef __U_BOOT__
2490 if (ctx->pending_redirect) {
2491 glob_target = &ctx->pending_redirect->word;
2492 } else {
2493 #endif
2494 if (child->group) {
2495 syntax();
2496 return 1; /* syntax error, groups and arglists don't mix */
2497 }
2498 if (!child->argv && (ctx->type & FLAG_PARSE_SEMICOLON)) {
2499 debug_printf("checking %s for reserved-ness\n",dest->data);
2500 if (reserved_word(dest,ctx)) return ctx->w==RES_SNTX;
2501 }
2502 #ifndef __U_BOOT__
2503 glob_target = &child->glob_result;
2504 if (child->argv) flags |= GLOB_APPEND;
2505 #else
2506 for (cnt = 1, s = dest->data; s && *s; s++) {
2507 if (*s == '\\') s++;
2508 cnt++;
2509 }
2510 str = malloc(cnt);
2511 if (!str) return 1;
2512 if ( child->argv == NULL) {
2513 child->argc=0;
2514 }
2515 argc = ++child->argc;
2516 child->argv = realloc(child->argv, (argc+1)*sizeof(*child->argv));
2517 if (child->argv == NULL) return 1;
2518 child->argv[argc-1]=str;
2519 child->argv[argc]=NULL;
2520 for (s = dest->data; s && *s; s++,str++) {
2521 if (*s == '\\') s++;
2522 *str = *s;
2523 }
2524 *str = '\0';
2525 #endif
2526 #ifndef __U_BOOT__
2527 }
2528 gr = xglob(dest, flags, glob_target);
2529 if (gr != 0) return 1;
2530 #endif
2531
2532 b_reset(dest);
2533 #ifndef __U_BOOT__
2534 if (ctx->pending_redirect) {
2535 ctx->pending_redirect=NULL;
2536 if (glob_target->gl_pathc != 1) {
2537 error_msg("ambiguous redirect");
2538 return 1;
2539 }
2540 } else {
2541 child->argv = glob_target->gl_pathv;
2542 }
2543 #endif
2544 if (ctx->w == RES_FOR) {
2545 done_word(dest,ctx);
2546 done_pipe(ctx,PIPE_SEQ);
2547 }
2548 return 0;
2549 }
2550
2551 /* The only possible error here is out of memory, in which case
2552 * xmalloc exits. */
2553 static int done_command(struct p_context *ctx)
2554 {
2555 /* The child is really already in the pipe structure, so
2556 * advance the pipe counter and make a new, null child.
2557 * Only real trickiness here is that the uncommitted
2558 * child structure, to which ctx->child points, is not
2559 * counted in pi->num_progs. */
2560 struct pipe *pi=ctx->pipe;
2561 struct child_prog *prog=ctx->child;
2562
2563 if (prog && prog->group == NULL
2564 && prog->argv == NULL
2565 #ifndef __U_BOOT__
2566 && prog->redirects == NULL) {
2567 #else
2568 ) {
2569 #endif
2570 debug_printf("done_command: skipping null command\n");
2571 return 0;
2572 } else if (prog) {
2573 pi->num_progs++;
2574 debug_printf("done_command: num_progs incremented to %d\n",pi->num_progs);
2575 } else {
2576 debug_printf("done_command: initializing\n");
2577 }
2578 pi->progs = xrealloc(pi->progs, sizeof(*pi->progs) * (pi->num_progs+1));
2579
2580 prog = pi->progs + pi->num_progs;
2581 #ifndef __U_BOOT__
2582 prog->redirects = NULL;
2583 #endif
2584 prog->argv = NULL;
2585 #ifndef __U_BOOT__
2586 prog->is_stopped = 0;
2587 #endif
2588 prog->group = NULL;
2589 #ifndef __U_BOOT__
2590 prog->glob_result.gl_pathv = NULL;
2591 prog->family = pi;
2592 #endif
2593 prog->sp = 0;
2594 ctx->child = prog;
2595 prog->type = ctx->type;
2596
2597 /* but ctx->pipe and ctx->list_head remain unchanged */
2598 return 0;
2599 }
2600
2601 static int done_pipe(struct p_context *ctx, pipe_style type)
2602 {
2603 struct pipe *new_p;
2604 done_command(ctx); /* implicit closure of previous command */
2605 debug_printf("done_pipe, type %d\n", type);
2606 ctx->pipe->followup = type;
2607 ctx->pipe->r_mode = ctx->w;
2608 new_p=new_pipe();
2609 ctx->pipe->next = new_p;
2610 ctx->pipe = new_p;
2611 ctx->child = NULL;
2612 done_command(ctx); /* set up new pipe to accept commands */
2613 return 0;
2614 }
2615
2616 #ifndef __U_BOOT__
2617 /* peek ahead in the in_str to find out if we have a "&n" construct,
2618 * as in "2>&1", that represents duplicating a file descriptor.
2619 * returns either -2 (syntax error), -1 (no &), or the number found.
2620 */
2621 static int redirect_dup_num(struct in_str *input)
2622 {
2623 int ch, d=0, ok=0;
2624 ch = b_peek(input);
2625 if (ch != '&') return -1;
2626
2627 b_getch(input); /* get the & */
2628 ch=b_peek(input);
2629 if (ch == '-') {
2630 b_getch(input);
2631 return -3; /* "-" represents "close me" */
2632 }
2633 while (isdigit(ch)) {
2634 d = d*10+(ch-'0');
2635 ok=1;
2636 b_getch(input);
2637 ch = b_peek(input);
2638 }
2639 if (ok) return d;
2640
2641 error_msg("ambiguous redirect");
2642 return -2;
2643 }
2644
2645 /* If a redirect is immediately preceded by a number, that number is
2646 * supposed to tell which file descriptor to redirect. This routine
2647 * looks for such preceding numbers. In an ideal world this routine
2648 * needs to handle all the following classes of redirects...
2649 * echo 2>foo # redirects fd 2 to file "foo", nothing passed to echo
2650 * echo 49>foo # redirects fd 49 to file "foo", nothing passed to echo
2651 * echo -2>foo # redirects fd 1 to file "foo", "-2" passed to echo
2652 * echo 49x>foo # redirects fd 1 to file "foo", "49x" passed to echo
2653 * A -1 output from this program means no valid number was found, so the
2654 * caller should use the appropriate default for this redirection.
2655 */
2656 static int redirect_opt_num(o_string *o)
2657 {
2658 int num;
2659
2660 if (o->length==0) return -1;
2661 for(num=0; num<o->length; num++) {
2662 if (!isdigit(*(o->data+num))) {
2663 return -1;
2664 }
2665 }
2666 /* reuse num (and save an int) */
2667 num=atoi(o->data);
2668 b_reset(o);
2669 return num;
2670 }
2671
2672 FILE *generate_stream_from_list(struct pipe *head)
2673 {
2674 FILE *pf;
2675 #if 1
2676 int pid, channel[2];
2677 if (pipe(channel)<0) perror_msg_and_die("pipe");
2678 pid=fork();
2679 if (pid<0) {
2680 perror_msg_and_die("fork");
2681 } else if (pid==0) {
2682 close(channel[0]);
2683 if (channel[1] != 1) {
2684 dup2(channel[1],1);
2685 close(channel[1]);
2686 }
2687 #if 0
2688 #define SURROGATE "surrogate response"
2689 write(1,SURROGATE,sizeof(SURROGATE));
2690 _exit(run_list(head));
2691 #else
2692 _exit(run_list_real(head)); /* leaks memory */
2693 #endif
2694 }
2695 debug_printf("forked child %d\n",pid);
2696 close(channel[1]);
2697 pf = fdopen(channel[0],"r");
2698 debug_printf("pipe on FILE *%p\n",pf);
2699 #else
2700 free_pipe_list(head,0);
2701 pf=popen("echo surrogate response","r");
2702 debug_printf("started fake pipe on FILE *%p\n",pf);
2703 #endif
2704 return pf;
2705 }
2706
2707 /* this version hacked for testing purposes */
2708 /* return code is exit status of the process that is run. */
2709 static int process_command_subs(o_string *dest, struct p_context *ctx, struct in_str *input, int subst_end)
2710 {
2711 int retcode;
2712 o_string result=NULL_O_STRING;
2713 struct p_context inner;
2714 FILE *p;
2715 struct in_str pipe_str;
2716 initialize_context(&inner);
2717
2718 /* recursion to generate command */
2719 retcode = parse_stream(&result, &inner, input, subst_end);
2720 if (retcode != 0) return retcode; /* syntax error or EOF */
2721 done_word(&result, &inner);
2722 done_pipe(&inner, PIPE_SEQ);
2723 b_free(&result);
2724
2725 p=generate_stream_from_list(inner.list_head);
2726 if (p==NULL) return 1;
2727 mark_open(fileno(p));
2728 setup_file_in_str(&pipe_str, p);
2729
2730 /* now send results of command back into original context */
2731 retcode = parse_stream(dest, ctx, &pipe_str, '\0');
2732 /* XXX In case of a syntax error, should we try to kill the child?
2733 * That would be tough to do right, so just read until EOF. */
2734 if (retcode == 1) {
2735 while (b_getch(&pipe_str)!=EOF) { /* discard */ };
2736 }
2737
2738 debug_printf("done reading from pipe, pclose()ing\n");
2739 /* This is the step that wait()s for the child. Should be pretty
2740 * safe, since we just read an EOF from its stdout. We could try
2741 * to better, by using wait(), and keeping track of background jobs
2742 * at the same time. That would be a lot of work, and contrary
2743 * to the KISS philosophy of this program. */
2744 mark_closed(fileno(p));
2745 retcode=pclose(p);
2746 free_pipe_list(inner.list_head,0);
2747 debug_printf("pclosed, retcode=%d\n",retcode);
2748 /* XXX this process fails to trim a single trailing newline */
2749 return retcode;
2750 }
2751
2752 static int parse_group(o_string *dest, struct p_context *ctx,
2753 struct in_str *input, int ch)
2754 {
2755 int rcode, endch=0;
2756 struct p_context sub;
2757 struct child_prog *child = ctx->child;
2758 if (child->argv) {
2759 syntax();
2760 return 1; /* syntax error, groups and arglists don't mix */
2761 }
2762 initialize_context(&sub);
2763 switch(ch) {
2764 case '(': endch=')'; child->subshell=1; break;
2765 case '{': endch='}'; break;
2766 default: syntax(); /* really logic error */
2767 }
2768 rcode=parse_stream(dest,&sub,input,endch);
2769 done_word(dest,&sub); /* finish off the final word in the subcontext */
2770 done_pipe(&sub, PIPE_SEQ); /* and the final command there, too */
2771 child->group = sub.list_head;
2772 return rcode;
2773 /* child remains "open", available for possible redirects */
2774 }
2775 #endif
2776
2777 /* basically useful version until someone wants to get fancier,
2778 * see the bash man page under "Parameter Expansion" */
2779 static char *lookup_param(char *src)
2780 {
2781 char *p;
2782
2783 if (!src)
2784 return NULL;
2785
2786 p = getenv(src);
2787 if (!p)
2788 p = get_local_var(src);
2789
2790 return p;
2791 }
2792
2793 #ifdef __U_BOOT__
2794 static char *get_dollar_var(char ch)
2795 {
2796 static char buf[40];
2797
2798 buf[0] = '\0';
2799 switch (ch) {
2800 case '?':
2801 sprintf(buf, "%u", (unsigned int)last_return_code);
2802 break;
2803 default:
2804 return NULL;
2805 }
2806 return buf;
2807 }
2808 #endif
2809
2810 /* return code: 0 for OK, 1 for syntax error */
2811 static int handle_dollar(o_string *dest, struct p_context *ctx, struct in_str *input)
2812 {
2813 #ifndef __U_BOOT__
2814 int i, advance=0;
2815 #else
2816 int advance=0;
2817 #endif
2818 #ifndef __U_BOOT__
2819 char sep[]=" ";
2820 #endif
2821 int ch = input->peek(input); /* first character after the $ */
2822 debug_printf("handle_dollar: ch=%c\n",ch);
2823 if (isalpha(ch)) {
2824 b_addchr(dest, SPECIAL_VAR_SYMBOL);
2825 ctx->child->sp++;
2826 while(ch=b_peek(input),isalnum(ch) || ch=='_') {
2827 b_getch(input);
2828 b_addchr(dest,ch);
2829 }
2830 b_addchr(dest, SPECIAL_VAR_SYMBOL);
2831 #ifndef __U_BOOT__
2832 } else if (isdigit(ch)) {
2833 i = ch-'0'; /* XXX is $0 special? */
2834 if (i<global_argc) {
2835 parse_string(dest, ctx, global_argv[i]); /* recursion */
2836 }
2837 advance = 1;
2838 #endif
2839 } else switch (ch) {
2840 #ifndef __U_BOOT__
2841 case '$':
2842 b_adduint(dest,getpid());
2843 advance = 1;
2844 break;
2845 case '!':
2846 if (last_bg_pid > 0) b_adduint(dest, last_bg_pid);
2847 advance = 1;
2848 break;
2849 #endif
2850 case '?':
2851 #ifndef __U_BOOT__
2852 b_adduint(dest,last_return_code);
2853 #else
2854 ctx->child->sp++;
2855 b_addchr(dest, SPECIAL_VAR_SYMBOL);
2856 b_addchr(dest, '$');
2857 b_addchr(dest, '?');
2858 b_addchr(dest, SPECIAL_VAR_SYMBOL);
2859 #endif
2860 advance = 1;
2861 break;
2862 #ifndef __U_BOOT__
2863 case '#':
2864 b_adduint(dest,global_argc ? global_argc-1 : 0);
2865 advance = 1;
2866 break;
2867 #endif
2868 case '{':
2869 b_addchr(dest, SPECIAL_VAR_SYMBOL);
2870 ctx->child->sp++;
2871 b_getch(input);
2872 /* XXX maybe someone will try to escape the '}' */
2873 while(ch=b_getch(input),ch!=EOF && ch!='}') {
2874 b_addchr(dest,ch);
2875 }
2876 if (ch != '}') {
2877 syntax();
2878 return 1;
2879 }
2880 b_addchr(dest, SPECIAL_VAR_SYMBOL);
2881 break;
2882 #ifndef __U_BOOT__
2883 case '(':
2884 b_getch(input);
2885 process_command_subs(dest, ctx, input, ')');
2886 break;
2887 case '*':
2888 sep[0]=ifs[0];
2889 for (i=1; i<global_argc; i++) {
2890 parse_string(dest, ctx, global_argv[i]);
2891 if (i+1 < global_argc) parse_string(dest, ctx, sep);
2892 }
2893 break;
2894 case '@':
2895 case '-':
2896 case '_':
2897 /* still unhandled, but should be eventually */
2898 error_msg("unhandled syntax: $%c",ch);
2899 return 1;
2900 break;
2901 #endif
2902 default:
2903 b_addqchr(dest,'$',dest->quote);
2904 }
2905 /* Eat the character if the flag was set. If the compiler
2906 * is smart enough, we could substitute "b_getch(input);"
2907 * for all the "advance = 1;" above, and also end up with
2908 * a nice size-optimized program. Hah! That'll be the day.
2909 */
2910 if (advance) b_getch(input);
2911 return 0;
2912 }
2913
2914 #ifndef __U_BOOT__
2915 int parse_string(o_string *dest, struct p_context *ctx, const char *src)
2916 {
2917 struct in_str foo;
2918 setup_string_in_str(&foo, src);
2919 return parse_stream(dest, ctx, &foo, '\0');
2920 }
2921 #endif
2922
2923 /* return code is 0 for normal exit, 1 for syntax error */
2924 int parse_stream(o_string *dest, struct p_context *ctx,
2925 struct in_str *input, int end_trigger)
2926 {
2927 unsigned int ch, m;
2928 #ifndef __U_BOOT__
2929 int redir_fd;
2930 redir_type redir_style;
2931 #endif
2932 int next;
2933
2934 /* Only double-quote state is handled in the state variable dest->quote.
2935 * A single-quote triggers a bypass of the main loop until its mate is
2936 * found. When recursing, quote state is passed in via dest->quote. */
2937
2938 debug_printf("parse_stream, end_trigger=%d\n",end_trigger);
2939 while ((ch=b_getch(input))!=EOF) {
2940 m = map[ch];
2941 #ifdef __U_BOOT__
2942 if (input->__promptme == 0) return 1;
2943 #endif
2944 next = (ch == '\n') ? 0 : b_peek(input);
2945
2946 debug_printf("parse_stream: ch=%c (%d) m=%d quote=%d - %c\n",
2947 ch >= ' ' ? ch : '.', ch, m,
2948 dest->quote, ctx->stack == NULL ? '*' : '.');
2949
2950 if (m==0 || ((m==1 || m==2) && dest->quote)) {
2951 b_addqchr(dest, ch, dest->quote);
2952 } else {
2953 if (m==2) { /* unquoted IFS */
2954 if (done_word(dest, ctx)) {
2955 return 1;
2956 }
2957 /* If we aren't performing a substitution, treat a newline as a
2958 * command separator. */
2959 if (end_trigger != '\0' && ch=='\n')
2960 done_pipe(ctx,PIPE_SEQ);
2961 }
2962 if (ch == end_trigger && !dest->quote && ctx->w==RES_NONE) {
2963 debug_printf("leaving parse_stream (triggered)\n");
2964 return 0;
2965 }
2966 #if 0
2967 if (ch=='\n') {
2968 /* Yahoo! Time to run with it! */
2969 done_pipe(ctx,PIPE_SEQ);
2970 run_list(ctx->list_head);
2971 initialize_context(ctx);
2972 }
2973 #endif
2974 if (m!=2) switch (ch) {
2975 case '#':
2976 if (dest->length == 0 && !dest->quote) {
2977 while(ch=b_peek(input),ch!=EOF && ch!='\n') { b_getch(input); }
2978 } else {
2979 b_addqchr(dest, ch, dest->quote);
2980 }
2981 break;
2982 case '\\':
2983 if (next == EOF) {
2984 syntax();
2985 return 1;
2986 }
2987 b_addqchr(dest, '\\', dest->quote);
2988 b_addqchr(dest, b_getch(input), dest->quote);
2989 break;
2990 case '$':
2991 if (handle_dollar(dest, ctx, input)!=0) return 1;
2992 break;
2993 case '\'':
2994 dest->nonnull = 1;
2995 while(ch=b_getch(input),ch!=EOF && ch!='\'') {
2996 #ifdef __U_BOOT__
2997 if(input->__promptme == 0) return 1;
2998 #endif
2999 b_addchr(dest,ch);
3000 }
3001 if (ch==EOF) {
3002 syntax();
3003 return 1;
3004 }
3005 break;
3006 case '"':
3007 dest->nonnull = 1;
3008 dest->quote = !dest->quote;
3009 break;
3010 #ifndef __U_BOOT__
3011 case '`':
3012 process_command_subs(dest, ctx, input, '`');
3013 break;
3014 case '>':
3015 redir_fd = redirect_opt_num(dest);
3016 done_word(dest, ctx);
3017 redir_style=REDIRECT_OVERWRITE;
3018 if (next == '>') {
3019 redir_style=REDIRECT_APPEND;
3020 b_getch(input);
3021 } else if (next == '(') {
3022 syntax(); /* until we support >(list) Process Substitution */
3023 return 1;
3024 }
3025 setup_redirect(ctx, redir_fd, redir_style, input);
3026 break;
3027 case '<':
3028 redir_fd = redirect_opt_num(dest);
3029 done_word(dest, ctx);
3030 redir_style=REDIRECT_INPUT;
3031 if (next == '<') {
3032 redir_style=REDIRECT_HEREIS;
3033 b_getch(input);
3034 } else if (next == '>') {
3035 redir_style=REDIRECT_IO;
3036 b_getch(input);
3037 } else if (next == '(') {
3038 syntax(); /* until we support <(list) Process Substitution */
3039 return 1;
3040 }
3041 setup_redirect(ctx, redir_fd, redir_style, input);
3042 break;
3043 #endif
3044 case ';':
3045 done_word(dest, ctx);
3046 done_pipe(ctx,PIPE_SEQ);
3047 break;
3048 case '&':
3049 done_word(dest, ctx);
3050 if (next=='&') {
3051 b_getch(input);
3052 done_pipe(ctx,PIPE_AND);
3053 } else {
3054 #ifndef __U_BOOT__
3055 done_pipe(ctx,PIPE_BG);
3056 #else
3057 syntax_err();
3058 return 1;
3059 #endif
3060 }
3061 break;
3062 case '|':
3063 done_word(dest, ctx);
3064 if (next=='|') {
3065 b_getch(input);
3066 done_pipe(ctx,PIPE_OR);
3067 } else {
3068 /* we could pick up a file descriptor choice here
3069 * with redirect_opt_num(), but bash doesn't do it.
3070 * "echo foo 2| cat" yields "foo 2". */
3071 #ifndef __U_BOOT__
3072 done_command(ctx);
3073 #else
3074 syntax_err();
3075 return 1;
3076 #endif
3077 }
3078 break;
3079 #ifndef __U_BOOT__
3080 case '(':
3081 case '{':
3082 if (parse_group(dest, ctx, input, ch)!=0) return 1;
3083 break;
3084 case ')':
3085 case '}':
3086 syntax(); /* Proper use of this character caught by end_trigger */
3087 return 1;
3088 break;
3089 #endif
3090 default:
3091 syntax(); /* this is really an internal logic error */
3092 return 1;
3093 }
3094 }
3095 }
3096 /* complain if quote? No, maybe we just finished a command substitution
3097 * that was quoted. Example:
3098 * $ echo "`cat foo` plus more"
3099 * and we just got the EOF generated by the subshell that ran "cat foo"
3100 * The only real complaint is if we got an EOF when end_trigger != '\0',
3101 * that is, we were really supposed to get end_trigger, and never got
3102 * one before the EOF. Can't use the standard "syntax error" return code,
3103 * so that parse_stream_outer can distinguish the EOF and exit smoothly. */
3104 debug_printf("leaving parse_stream (EOF)\n");
3105 if (end_trigger != '\0') return -1;
3106 return 0;
3107 }
3108
3109 void mapset(const unsigned char *set, int code)
3110 {
3111 const unsigned char *s;
3112 for (s=set; *s; s++) map[*s] = code;
3113 }
3114
3115 void update_ifs_map(void)
3116 {
3117 /* char *ifs and char map[256] are both globals. */
3118 ifs = getenv("IFS");
3119 if (ifs == NULL) ifs=" \t\n";
3120 /* Precompute a list of 'flow through' behavior so it can be treated
3121 * quickly up front. Computation is necessary because of IFS.
3122 * Special case handling of IFS == " \t\n" is not implemented.
3123 * The map[] array only really needs two bits each, and on most machines
3124 * that would be faster because of the reduced L1 cache footprint.
3125 */
3126 memset(map,0,sizeof(map)); /* most characters flow through always */
3127 #ifndef __U_BOOT__
3128 mapset("\\$'\"`", 3); /* never flow through */
3129 mapset("<>;&|(){}#", 1); /* flow through if quoted */
3130 #else
3131 mapset("\\$'\"", 3); /* never flow through */
3132 mapset(";&|#", 1); /* flow through if quoted */
3133 #endif
3134 mapset(ifs, 2); /* also flow through if quoted */
3135 }
3136
3137 /* most recursion does not come through here, the exeception is
3138 * from builtin_source() */
3139 int parse_stream_outer(struct in_str *inp, int flag)
3140 {
3141
3142 struct p_context ctx;
3143 o_string temp=NULL_O_STRING;
3144 int rcode;
3145 #ifdef __U_BOOT__
3146 int code = 0;
3147 #endif
3148 do {
3149 ctx.type = flag;
3150 initialize_context(&ctx);
3151 update_ifs_map();
3152 if (!(flag & FLAG_PARSE_SEMICOLON) || (flag & FLAG_REPARSING)) mapset(";$&|", 0);
3153 inp->promptmode=1;
3154 rcode = parse_stream(&temp, &ctx, inp, '\n');
3155 #ifdef __U_BOOT__
3156 if (rcode == 1) flag_repeat = 0;
3157 #endif
3158 if (rcode != 1 && ctx.old_flag != 0) {
3159 syntax();
3160 #ifdef __U_BOOT__
3161 flag_repeat = 0;
3162 #endif
3163 }
3164 if (rcode != 1 && ctx.old_flag == 0) {
3165 done_word(&temp, &ctx);
3166 done_pipe(&ctx,PIPE_SEQ);
3167 #ifndef __U_BOOT__
3168 run_list(ctx.list_head);
3169 #else
3170 code = run_list(ctx.list_head);
3171 if (code == -2) { /* exit */
3172 b_free(&temp);
3173 code = 0;
3174 /* XXX hackish way to not allow exit from main loop */
3175 if (inp->peek == file_peek) {
3176 printf("exit not allowed from main input shell.\n");
3177 continue;
3178 }
3179 break;
3180 }
3181 if (code == -1)
3182 flag_repeat = 0;
3183 #endif
3184 } else {
3185 if (ctx.old_flag != 0) {
3186 free(ctx.stack);
3187 b_reset(&temp);
3188 }
3189 #ifdef __U_BOOT__
3190 if (inp->__promptme == 0) printf("<INTERRUPT>\n");
3191 inp->__promptme = 1;
3192 #endif
3193 temp.nonnull = 0;
3194 temp.quote = 0;
3195 inp->p = NULL;
3196 free_pipe_list(ctx.list_head,0);
3197 }
3198 b_free(&temp);
3199 } while (rcode != -1 && !(flag & FLAG_EXIT_FROM_LOOP)); /* loop on syntax errors, return on EOF */
3200 #ifndef __U_BOOT__
3201 return 0;
3202 #else
3203 return (code != 0) ? 1 : 0;
3204 #endif /* __U_BOOT__ */
3205 }
3206
3207 #ifndef __U_BOOT__
3208 static int parse_string_outer(const char *s, int flag)
3209 #else
3210 int parse_string_outer(char *s, int flag)
3211 #endif /* __U_BOOT__ */
3212 {
3213 struct in_str input;
3214 #ifdef __U_BOOT__
3215 char *p = NULL;
3216 int rcode;
3217 if ( !s || !*s)
3218 return 1;
3219 if (!(p = strchr(s, '\n')) || *++p) {
3220 p = xmalloc(strlen(s) + 2);
3221 strcpy(p, s);
3222 strcat(p, "\n");
3223 setup_string_in_str(&input, p);
3224 rcode = parse_stream_outer(&input, flag);
3225 free(p);
3226 return rcode;
3227 } else {
3228 #endif
3229 setup_string_in_str(&input, s);
3230 return parse_stream_outer(&input, flag);
3231 #ifdef __U_BOOT__
3232 }
3233 #endif
3234 }
3235
3236 #ifndef __U_BOOT__
3237 static int parse_file_outer(FILE *f)
3238 #else
3239 int parse_file_outer(void)
3240 #endif
3241 {
3242 int rcode;
3243 struct in_str input;
3244 #ifndef __U_BOOT__
3245 setup_file_in_str(&input, f);
3246 #else
3247 setup_file_in_str(&input);
3248 #endif
3249 rcode = parse_stream_outer(&input, FLAG_PARSE_SEMICOLON);
3250 return rcode;
3251 }
3252
3253 #ifdef __U_BOOT__
3254 static void u_boot_hush_reloc(void)
3255 {
3256 DECLARE_GLOBAL_DATA_PTR;
3257 unsigned long addr;
3258 struct reserved_combo *r;
3259
3260 for (r=reserved_list; r<reserved_list+NRES; r++) {
3261 addr = (ulong) (r->literal) + gd->reloc_off;
3262 r->literal = (char *)addr;
3263 }
3264 }
3265
3266 int u_boot_hush_start(void)
3267 {
3268 if (top_vars == NULL) {
3269 top_vars = malloc(sizeof(struct variables));
3270 top_vars->name = "HUSH_VERSION";
3271 top_vars->value = "0.01";
3272 top_vars->next = 0;
3273 top_vars->flg_export = 0;
3274 top_vars->flg_read_only = 1;
3275 u_boot_hush_reloc();
3276 }
3277 return 0;
3278 }
3279
3280 static void *xmalloc(size_t size)
3281 {
3282 void *p = NULL;
3283
3284 if (!(p = malloc(size))) {
3285 printf("ERROR : memory not allocated\n");
3286 for(;;);
3287 }
3288 return p;
3289 }
3290
3291 static void *xrealloc(void *ptr, size_t size)
3292 {
3293 void *p = NULL;
3294
3295 if (!(p = realloc(ptr, size))) {
3296 printf("ERROR : memory not allocated\n");
3297 for(;;);
3298 }
3299 return p;
3300 }
3301 #endif /* __U_BOOT__ */
3302
3303 #ifndef __U_BOOT__
3304 /* Make sure we have a controlling tty. If we get started under a job
3305 * aware app (like bash for example), make sure we are now in charge so
3306 * we don't fight over who gets the foreground */
3307 static void setup_job_control(void)
3308 {
3309 static pid_t shell_pgrp;
3310 /* Loop until we are in the foreground. */
3311 while (tcgetpgrp (shell_terminal) != (shell_pgrp = getpgrp ()))
3312 kill (- shell_pgrp, SIGTTIN);
3313
3314 /* Ignore interactive and job-control signals. */
3315 signal(SIGINT, SIG_IGN);
3316 signal(SIGQUIT, SIG_IGN);
3317 signal(SIGTERM, SIG_IGN);
3318 signal(SIGTSTP, SIG_IGN);
3319 signal(SIGTTIN, SIG_IGN);
3320 signal(SIGTTOU, SIG_IGN);
3321 signal(SIGCHLD, SIG_IGN);
3322
3323 /* Put ourselves in our own process group. */
3324 setsid();
3325 shell_pgrp = getpid ();
3326 setpgid (shell_pgrp, shell_pgrp);
3327
3328 /* Grab control of the terminal. */
3329 tcsetpgrp(shell_terminal, shell_pgrp);
3330 }
3331
3332 int hush_main(int argc, char **argv)
3333 {
3334 int opt;
3335 FILE *input;
3336 char **e = environ;
3337
3338 /* XXX what should these be while sourcing /etc/profile? */
3339 global_argc = argc;
3340 global_argv = argv;
3341
3342 /* (re?) initialize globals. Sometimes hush_main() ends up calling
3343 * hush_main(), therefore we cannot rely on the BSS to zero out this
3344 * stuff. Reset these to 0 every time. */
3345 ifs = NULL;
3346 /* map[] is taken care of with call to update_ifs_map() */
3347 fake_mode = 0;
3348 interactive = 0;
3349 close_me_head = NULL;
3350 last_bg_pid = 0;
3351 job_list = NULL;
3352 last_jobid = 0;
3353
3354 /* Initialize some more globals to non-zero values */
3355 set_cwd();
3356 #ifdef CONFIG_FEATURE_COMMAND_EDITING
3357 cmdedit_set_initial_prompt();
3358 #else
3359 PS1 = NULL;
3360 #endif
3361 PS2 = "> ";
3362
3363 /* initialize our shell local variables with the values
3364 * currently living in the environment */
3365 if (e) {
3366 for (; *e; e++)
3367 set_local_var(*e, 2); /* without call putenv() */
3368 }
3369
3370 last_return_code=EXIT_SUCCESS;
3371
3372
3373 if (argv[0] && argv[0][0] == '-') {
3374 debug_printf("\nsourcing /etc/profile\n");
3375 if ((input = fopen("/etc/profile", "r")) != NULL) {
3376 mark_open(fileno(input));
3377 parse_file_outer(input);
3378 mark_closed(fileno(input));
3379 fclose(input);
3380 }
3381 }
3382 input=stdin;
3383
3384 while ((opt = getopt(argc, argv, "c:xif")) > 0) {
3385 switch (opt) {
3386 case 'c':
3387 {
3388 global_argv = argv+optind;
3389 global_argc = argc-optind;
3390 opt = parse_string_outer(optarg, FLAG_PARSE_SEMICOLON);
3391 goto final_return;
3392 }
3393 break;
3394 case 'i':
3395 interactive++;
3396 break;
3397 case 'f':
3398 fake_mode++;
3399 break;
3400 default:
3401 #ifndef BB_VER
3402 fprintf(stderr, "Usage: sh [FILE]...\n"
3403 " or: sh -c command [args]...\n\n");
3404 exit(EXIT_FAILURE);
3405 #else
3406 show_usage();
3407 #endif
3408 }
3409 }
3410 /* A shell is interactive if the `-i' flag was given, or if all of
3411 * the following conditions are met:
3412 * no -c command
3413 * no arguments remaining or the -s flag given
3414 * standard input is a terminal
3415 * standard output is a terminal
3416 * Refer to Posix.2, the description of the `sh' utility. */
3417 if (argv[optind]==NULL && input==stdin &&
3418 isatty(fileno(stdin)) && isatty(fileno(stdout))) {
3419 interactive++;
3420 }
3421
3422 debug_printf("\ninteractive=%d\n", interactive);
3423 if (interactive) {
3424 /* Looks like they want an interactive shell */
3425 #ifndef CONFIG_FEATURE_SH_EXTRA_QUIET
3426 printf( "\n\n" BB_BANNER " hush - the humble shell v0.01 (testing)\n");
3427 printf( "Enter 'help' for a list of built-in commands.\n\n");
3428 #endif
3429 setup_job_control();
3430 }
3431
3432 if (argv[optind]==NULL) {
3433 opt=parse_file_outer(stdin);
3434 goto final_return;
3435 }
3436
3437 debug_printf("\nrunning script '%s'\n", argv[optind]);
3438 global_argv = argv+optind;
3439 global_argc = argc-optind;
3440 input = xfopen(argv[optind], "r");
3441 opt = parse_file_outer(input);
3442
3443 #ifdef CONFIG_FEATURE_CLEAN_UP
3444 fclose(input);
3445 if (cwd && cwd != unknown)
3446 free((char*)cwd);
3447 {
3448 struct variables *cur, *tmp;
3449 for(cur = top_vars; cur; cur = tmp) {
3450 tmp = cur->next;
3451 if (!cur->flg_read_only) {
3452 free(cur->name);
3453 free(cur->value);
3454 free(cur);
3455 }
3456 }
3457 }
3458 #endif
3459
3460 final_return:
3461 return(opt?opt:last_return_code);
3462 }
3463 #endif
3464
3465 static char *insert_var_value(char *inp)
3466 {
3467 int res_str_len = 0;
3468 int len;
3469 int done = 0;
3470 char *p, *p1, *res_str = NULL;
3471
3472 while ((p = strchr(inp, SPECIAL_VAR_SYMBOL))) {
3473 if (p != inp) {
3474 len = p - inp;
3475 res_str = xrealloc(res_str, (res_str_len + len));
3476 strncpy((res_str + res_str_len), inp, len);
3477 res_str_len += len;
3478 }
3479 inp = ++p;
3480 p = strchr(inp, SPECIAL_VAR_SYMBOL);
3481 *p = '\0';
3482 if ((p1 = lookup_param(inp))) {
3483 len = res_str_len + strlen(p1);
3484 res_str = xrealloc(res_str, (1 + len));
3485 strcpy((res_str + res_str_len), p1);
3486 res_str_len = len;
3487 }
3488 *p = SPECIAL_VAR_SYMBOL;
3489 inp = ++p;
3490 done = 1;
3491 }
3492 if (done) {
3493 res_str = xrealloc(res_str, (1 + res_str_len + strlen(inp)));
3494 strcpy((res_str + res_str_len), inp);
3495 while ((p = strchr(res_str, '\n'))) {
3496 *p = ' ';
3497 }
3498 }
3499 return (res_str == NULL) ? inp : res_str;
3500 }
3501
3502 static char **make_list_in(char **inp, char *name)
3503 {
3504 int len, i;
3505 int name_len = strlen(name);
3506 int n = 0;
3507 char **list;
3508 char *p1, *p2, *p3;
3509
3510 /* create list of variable values */
3511 list = xmalloc(sizeof(*list));
3512 for (i = 0; inp[i]; i++) {
3513 p3 = insert_var_value(inp[i]);
3514 p1 = p3;
3515 while (*p1) {
3516 if ((*p1 == ' ')) {
3517 p1++;
3518 continue;
3519 }
3520 if ((p2 = strchr(p1, ' '))) {
3521 len = p2 - p1;
3522 } else {
3523 len = strlen(p1);
3524 p2 = p1 + len;
3525 }
3526 /* we use n + 2 in realloc for list,because we add
3527 * new element and then we will add NULL element */
3528 list = xrealloc(list, sizeof(*list) * (n + 2));
3529 list[n] = xmalloc(2 + name_len + len);
3530 strcpy(list[n], name);
3531 strcat(list[n], "=");
3532 strncat(list[n], p1, len);
3533 list[n++][name_len + len + 1] = '\0';
3534 p1 = p2;
3535 }
3536 if (p3 != inp[i]) free(p3);
3537 }
3538 list[n] = NULL;
3539 return list;
3540 }
3541
3542 /* Make new string for parser */
3543 static char * make_string(char ** inp)
3544 {
3545 char *p;
3546 char *str = NULL;
3547 int n;
3548 int len = 2;
3549
3550 for (n = 0; inp[n]; n++) {
3551 p = insert_var_value(inp[n]);
3552 str = xrealloc(str, (len + strlen(p)));
3553 if (n) {
3554 strcat(str, " ");
3555 } else {
3556 *str = '\0';
3557 }
3558 strcat(str, p);
3559 len = strlen(str) + 3;
3560 if (p != inp[n]) free(p);
3561 }
3562 len = strlen(str);
3563 *(str + len) = '\n';
3564 *(str + len + 1) = '\0';
3565 return str;
3566 }
3567
3568 #endif /* CFG_HUSH_PARSER */
3569 /****************************************************************************/
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