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* Code cleanup:
[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 #ifndef __U_BOOT__
294 extern char **environ; /* This is in <unistd.h>, but protected with __USE_GNU */
295 #endif
296
297 /* "globals" within this file */
298 static char *ifs;
299 static char map[256];
300 #ifndef __U_BOOT__
301 static int fake_mode;
302 static int interactive;
303 static struct close_me *close_me_head;
304 static const char *cwd;
305 static struct pipe *job_list;
306 static unsigned int last_bg_pid;
307 static unsigned int last_jobid;
308 static unsigned int shell_terminal;
309 static char *PS1;
310 static char *PS2;
311 struct variables shell_ver = { "HUSH_VERSION", "0.01", 1, 1, 0 };
312 struct variables *top_vars = &shell_ver;
313 #else
314 static int flag_repeat = 0;
315 static int do_repeat = 0;
316 static struct variables *top_vars ;
317 #endif /*__U_BOOT__ */
318
319 #define B_CHUNK (100)
320 #define B_NOSPAC 1
321
322 typedef struct {
323 char *data;
324 int length;
325 int maxlen;
326 int quote;
327 int nonnull;
328 } o_string;
329 #define NULL_O_STRING {NULL,0,0,0,0}
330 /* used for initialization:
331 o_string foo = NULL_O_STRING; */
332
333 /* I can almost use ordinary FILE *. Is open_memstream() universally
334 * available? Where is it documented? */
335 struct in_str {
336 const char *p;
337 #ifndef __U_BOOT__
338 char peek_buf[2];
339 #endif
340 int __promptme;
341 int promptmode;
342 #ifndef __U_BOOT__
343 FILE *file;
344 #endif
345 int (*get) (struct in_str *);
346 int (*peek) (struct in_str *);
347 };
348 #define b_getch(input) ((input)->get(input))
349 #define b_peek(input) ((input)->peek(input))
350
351 #ifndef __U_BOOT__
352 #define JOB_STATUS_FORMAT "[%d] %-22s %.40s\n"
353
354 struct built_in_command {
355 char *cmd; /* name */
356 char *descr; /* description */
357 int (*function) (struct child_prog *); /* function ptr */
358 };
359 #endif
360
361 /* This should be in utility.c */
362 #ifdef DEBUG_SHELL
363 #ifndef __U_BOOT__
364 static void debug_printf(const char *format, ...)
365 {
366 va_list args;
367 va_start(args, format);
368 vfprintf(stderr, format, args);
369 va_end(args);
370 }
371 #else
372 #define debug_printf printf /* U-Boot debug flag */
373 #endif
374 #else
375 static inline void debug_printf(const char *format, ...) { }
376 #endif
377 #define final_printf debug_printf
378
379 #ifdef __U_BOOT__
380 static void syntax_err(void) {
381 printf("syntax error\n");
382 }
383 #else
384 static void __syntax(char *file, int line) {
385 error_msg("syntax error %s:%d", file, line);
386 }
387 #define syntax() __syntax(__FILE__, __LINE__)
388 #endif
389
390 #ifdef __U_BOOT__
391 static void *xmalloc(size_t size);
392 static void *xrealloc(void *ptr, size_t size);
393 #else
394 /* Index of subroutines: */
395 /* function prototypes for builtins */
396 static int builtin_cd(struct child_prog *child);
397 static int builtin_env(struct child_prog *child);
398 static int builtin_eval(struct child_prog *child);
399 static int builtin_exec(struct child_prog *child);
400 static int builtin_exit(struct child_prog *child);
401 static int builtin_export(struct child_prog *child);
402 static int builtin_fg_bg(struct child_prog *child);
403 static int builtin_help(struct child_prog *child);
404 static int builtin_jobs(struct child_prog *child);
405 static int builtin_pwd(struct child_prog *child);
406 static int builtin_read(struct child_prog *child);
407 static int builtin_set(struct child_prog *child);
408 static int builtin_shift(struct child_prog *child);
409 static int builtin_source(struct child_prog *child);
410 static int builtin_umask(struct child_prog *child);
411 static int builtin_unset(struct child_prog *child);
412 static int builtin_not_written(struct child_prog *child);
413 #endif
414 /* o_string manipulation: */
415 static int b_check_space(o_string *o, int len);
416 static int b_addchr(o_string *o, int ch);
417 static void b_reset(o_string *o);
418 static int b_addqchr(o_string *o, int ch, int quote);
419 static int b_adduint(o_string *o, unsigned int i);
420 /* in_str manipulations: */
421 static int static_get(struct in_str *i);
422 static int static_peek(struct in_str *i);
423 static int file_get(struct in_str *i);
424 static int file_peek(struct in_str *i);
425 #ifndef __U_BOOT__
426 static void setup_file_in_str(struct in_str *i, FILE *f);
427 #else
428 static void setup_file_in_str(struct in_str *i);
429 #endif
430 static void setup_string_in_str(struct in_str *i, const char *s);
431 #ifndef __U_BOOT__
432 /* close_me manipulations: */
433 static void mark_open(int fd);
434 static void mark_closed(int fd);
435 static void close_all(void);
436 #endif
437 /* "run" the final data structures: */
438 static char *indenter(int i);
439 static int free_pipe_list(struct pipe *head, int indent);
440 static int free_pipe(struct pipe *pi, int indent);
441 /* really run the final data structures: */
442 #ifndef __U_BOOT__
443 static int setup_redirects(struct child_prog *prog, int squirrel[]);
444 #endif
445 static int run_list_real(struct pipe *pi);
446 #ifndef __U_BOOT__
447 static void pseudo_exec(struct child_prog *child) __attribute__ ((noreturn));
448 #endif
449 static int run_pipe_real(struct pipe *pi);
450 /* extended glob support: */
451 #ifndef __U_BOOT__
452 static int globhack(const char *src, int flags, glob_t *pglob);
453 static int glob_needed(const char *s);
454 static int xglob(o_string *dest, int flags, glob_t *pglob);
455 #endif
456 /* variable assignment: */
457 static int is_assignment(const char *s);
458 /* data structure manipulation: */
459 #ifndef __U_BOOT__
460 static int setup_redirect(struct p_context *ctx, int fd, redir_type style, struct in_str *input);
461 #endif
462 static void initialize_context(struct p_context *ctx);
463 static int done_word(o_string *dest, struct p_context *ctx);
464 static int done_command(struct p_context *ctx);
465 static int done_pipe(struct p_context *ctx, pipe_style type);
466 /* primary string parsing: */
467 #ifndef __U_BOOT__
468 static int redirect_dup_num(struct in_str *input);
469 static int redirect_opt_num(o_string *o);
470 static int process_command_subs(o_string *dest, struct p_context *ctx, struct in_str *input, int subst_end);
471 static int parse_group(o_string *dest, struct p_context *ctx, struct in_str *input, int ch);
472 #endif
473 static char *lookup_param(char *src);
474 static char *make_string(char **inp);
475 static int handle_dollar(o_string *dest, struct p_context *ctx, struct in_str *input);
476 #ifndef __U_BOOT__
477 static int parse_string(o_string *dest, struct p_context *ctx, const char *src);
478 #endif
479 static int parse_stream(o_string *dest, struct p_context *ctx, struct in_str *input0, int end_trigger);
480 /* setup: */
481 static int parse_stream_outer(struct in_str *inp, int flag);
482 #ifndef __U_BOOT__
483 static int parse_string_outer(const char *s, int flag);
484 static int parse_file_outer(FILE *f);
485 #endif
486 #ifndef __U_BOOT__
487 /* job management: */
488 static int checkjobs(struct pipe* fg_pipe);
489 static void insert_bg_job(struct pipe *pi);
490 static void remove_bg_job(struct pipe *pi);
491 #endif
492 /* local variable support */
493 static char **make_list_in(char **inp, char *name);
494 static char *insert_var_value(char *inp);
495 static char *get_local_var(const char *var);
496 #ifndef __U_BOOT__
497 static void unset_local_var(const char *name);
498 #endif
499 static int set_local_var(const char *s, int flg_export);
500
501 #ifndef __U_BOOT__
502 /* Table of built-in functions. They can be forked or not, depending on
503 * context: within pipes, they fork. As simple commands, they do not.
504 * When used in non-forking context, they can change global variables
505 * in the parent shell process. If forked, of course they can not.
506 * For example, 'unset foo | whatever' will parse and run, but foo will
507 * still be set at the end. */
508 static struct built_in_command bltins[] = {
509 {"bg", "Resume a job in the background", builtin_fg_bg},
510 {"break", "Exit for, while or until loop", builtin_not_written},
511 {"cd", "Change working directory", builtin_cd},
512 {"continue", "Continue for, while or until loop", builtin_not_written},
513 {"env", "Print all environment variables", builtin_env},
514 {"eval", "Construct and run shell command", builtin_eval},
515 {"exec", "Exec command, replacing this shell with the exec'd process",
516 builtin_exec},
517 {"exit", "Exit from shell()", builtin_exit},
518 {"export", "Set environment variable", builtin_export},
519 {"fg", "Bring job into the foreground", builtin_fg_bg},
520 {"jobs", "Lists the active jobs", builtin_jobs},
521 {"pwd", "Print current directory", builtin_pwd},
522 {"read", "Input environment variable", builtin_read},
523 {"return", "Return from a function", builtin_not_written},
524 {"set", "Set/unset shell local variables", builtin_set},
525 {"shift", "Shift positional parameters", builtin_shift},
526 {"trap", "Trap signals", builtin_not_written},
527 {"ulimit","Controls resource limits", builtin_not_written},
528 {"umask","Sets file creation mask", builtin_umask},
529 {"unset", "Unset environment variable", builtin_unset},
530 {".", "Source-in and run commands in a file", builtin_source},
531 {"help", "List shell built-in commands", builtin_help},
532 {NULL, NULL, NULL}
533 };
534
535 static const char *set_cwd(void)
536 {
537 if(cwd==unknown)
538 cwd = NULL; /* xgetcwd(arg) called free(arg) */
539 cwd = xgetcwd((char *)cwd);
540 if (!cwd)
541 cwd = unknown;
542 return cwd;
543 }
544
545 /* built-in 'eval' handler */
546 static int builtin_eval(struct child_prog *child)
547 {
548 char *str = NULL;
549 int rcode = EXIT_SUCCESS;
550
551 if (child->argv[1]) {
552 str = make_string(child->argv + 1);
553 parse_string_outer(str, FLAG_EXIT_FROM_LOOP |
554 FLAG_PARSE_SEMICOLON);
555 free(str);
556 rcode = last_return_code;
557 }
558 return rcode;
559 }
560
561 /* built-in 'cd <path>' handler */
562 static int builtin_cd(struct child_prog *child)
563 {
564 char *newdir;
565 if (child->argv[1] == NULL)
566 newdir = getenv("HOME");
567 else
568 newdir = child->argv[1];
569 if (chdir(newdir)) {
570 printf("cd: %s: %s\n", newdir, strerror(errno));
571 return EXIT_FAILURE;
572 }
573 set_cwd();
574 return EXIT_SUCCESS;
575 }
576
577 /* built-in 'env' handler */
578 static int builtin_env(struct child_prog *dummy)
579 {
580 char **e = environ;
581 if (e == NULL) return EXIT_FAILURE;
582 for (; *e; e++) {
583 puts(*e);
584 }
585 return EXIT_SUCCESS;
586 }
587
588 /* built-in 'exec' handler */
589 static int builtin_exec(struct child_prog *child)
590 {
591 if (child->argv[1] == NULL)
592 return EXIT_SUCCESS; /* Really? */
593 child->argv++;
594 pseudo_exec(child);
595 /* never returns */
596 }
597
598 /* built-in 'exit' handler */
599 static int builtin_exit(struct child_prog *child)
600 {
601 if (child->argv[1] == NULL)
602 exit(last_return_code);
603 exit (atoi(child->argv[1]));
604 }
605
606 /* built-in 'export VAR=value' handler */
607 static int builtin_export(struct child_prog *child)
608 {
609 int res = 0;
610 char *name = child->argv[1];
611
612 if (name == NULL) {
613 return (builtin_env(child));
614 }
615
616 name = strdup(name);
617
618 if(name) {
619 char *value = strchr(name, '=');
620
621 if (!value) {
622 char *tmp;
623 /* They are exporting something without an =VALUE */
624
625 value = get_local_var(name);
626 if (value) {
627 size_t ln = strlen(name);
628
629 tmp = realloc(name, ln+strlen(value)+2);
630 if(tmp==NULL)
631 res = -1;
632 else {
633 sprintf(tmp+ln, "=%s", value);
634 name = tmp;
635 }
636 } else {
637 /* bash does not return an error when trying to export
638 * an undefined variable. Do likewise. */
639 res = 1;
640 }
641 }
642 }
643 if (res<0)
644 perror_msg("export");
645 else if(res==0)
646 res = set_local_var(name, 1);
647 else
648 res = 0;
649 free(name);
650 return res;
651 }
652
653 /* built-in 'fg' and 'bg' handler */
654 static int builtin_fg_bg(struct child_prog *child)
655 {
656 int i, jobnum;
657 struct pipe *pi=NULL;
658
659 if (!interactive)
660 return EXIT_FAILURE;
661 /* If they gave us no args, assume they want the last backgrounded task */
662 if (!child->argv[1]) {
663 for (pi = job_list; pi; pi = pi->next) {
664 if (pi->jobid == last_jobid) {
665 break;
666 }
667 }
668 if (!pi) {
669 error_msg("%s: no current job", child->argv[0]);
670 return EXIT_FAILURE;
671 }
672 } else {
673 if (sscanf(child->argv[1], "%%%d", &jobnum) != 1) {
674 error_msg("%s: bad argument '%s'", child->argv[0], child->argv[1]);
675 return EXIT_FAILURE;
676 }
677 for (pi = job_list; pi; pi = pi->next) {
678 if (pi->jobid == jobnum) {
679 break;
680 }
681 }
682 if (!pi) {
683 error_msg("%s: %d: no such job", child->argv[0], jobnum);
684 return EXIT_FAILURE;
685 }
686 }
687
688 if (*child->argv[0] == 'f') {
689 /* Put the job into the foreground. */
690 tcsetpgrp(shell_terminal, pi->pgrp);
691 }
692
693 /* Restart the processes in the job */
694 for (i = 0; i < pi->num_progs; i++)
695 pi->progs[i].is_stopped = 0;
696
697 if ( (i=kill(- pi->pgrp, SIGCONT)) < 0) {
698 if (i == ESRCH) {
699 remove_bg_job(pi);
700 } else {
701 perror_msg("kill (SIGCONT)");
702 }
703 }
704
705 pi->stopped_progs = 0;
706 return EXIT_SUCCESS;
707 }
708
709 /* built-in 'help' handler */
710 static int builtin_help(struct child_prog *dummy)
711 {
712 struct built_in_command *x;
713
714 printf("\nBuilt-in commands:\n");
715 printf("-------------------\n");
716 for (x = bltins; x->cmd; x++) {
717 if (x->descr==NULL)
718 continue;
719 printf("%s\t%s\n", x->cmd, x->descr);
720 }
721 printf("\n\n");
722 return EXIT_SUCCESS;
723 }
724
725 /* built-in 'jobs' handler */
726 static int builtin_jobs(struct child_prog *child)
727 {
728 struct pipe *job;
729 char *status_string;
730
731 for (job = job_list; job; job = job->next) {
732 if (job->running_progs == job->stopped_progs)
733 status_string = "Stopped";
734 else
735 status_string = "Running";
736
737 printf(JOB_STATUS_FORMAT, job->jobid, status_string, job->text);
738 }
739 return EXIT_SUCCESS;
740 }
741
742
743 /* built-in 'pwd' handler */
744 static int builtin_pwd(struct child_prog *dummy)
745 {
746 puts(set_cwd());
747 return EXIT_SUCCESS;
748 }
749
750 /* built-in 'read VAR' handler */
751 static int builtin_read(struct child_prog *child)
752 {
753 int res;
754
755 if (child->argv[1]) {
756 char string[BUFSIZ];
757 char *var = 0;
758
759 string[0] = 0; /* In case stdin has only EOF */
760 /* read string */
761 fgets(string, sizeof(string), stdin);
762 chomp(string);
763 var = malloc(strlen(child->argv[1])+strlen(string)+2);
764 if(var) {
765 sprintf(var, "%s=%s", child->argv[1], string);
766 res = set_local_var(var, 0);
767 } else
768 res = -1;
769 if (res)
770 fprintf(stderr, "read: %m\n");
771 free(var); /* So not move up to avoid breaking errno */
772 return res;
773 } else {
774 do res=getchar(); while(res!='\n' && res!=EOF);
775 return 0;
776 }
777 }
778
779 /* built-in 'set VAR=value' handler */
780 static int builtin_set(struct child_prog *child)
781 {
782 char *temp = child->argv[1];
783 struct variables *e;
784
785 if (temp == NULL)
786 for(e = top_vars; e; e=e->next)
787 printf("%s=%s\n", e->name, e->value);
788 else
789 set_local_var(temp, 0);
790
791 return EXIT_SUCCESS;
792 }
793
794
795 /* Built-in 'shift' handler */
796 static int builtin_shift(struct child_prog *child)
797 {
798 int n=1;
799 if (child->argv[1]) {
800 n=atoi(child->argv[1]);
801 }
802 if (n>=0 && n<global_argc) {
803 /* XXX This probably breaks $0 */
804 global_argc -= n;
805 global_argv += n;
806 return EXIT_SUCCESS;
807 } else {
808 return EXIT_FAILURE;
809 }
810 }
811
812 /* Built-in '.' handler (read-in and execute commands from file) */
813 static int builtin_source(struct child_prog *child)
814 {
815 FILE *input;
816 int status;
817
818 if (child->argv[1] == NULL)
819 return EXIT_FAILURE;
820
821 /* XXX search through $PATH is missing */
822 input = fopen(child->argv[1], "r");
823 if (!input) {
824 error_msg("Couldn't open file '%s'", child->argv[1]);
825 return EXIT_FAILURE;
826 }
827
828 /* Now run the file */
829 /* XXX argv and argc are broken; need to save old global_argv
830 * (pointer only is OK!) on this stack frame,
831 * set global_argv=child->argv+1, recurse, and restore. */
832 mark_open(fileno(input));
833 status = parse_file_outer(input);
834 mark_closed(fileno(input));
835 fclose(input);
836 return (status);
837 }
838
839 static int builtin_umask(struct child_prog *child)
840 {
841 mode_t new_umask;
842 const char *arg = child->argv[1];
843 char *end;
844 if (arg) {
845 new_umask=strtoul(arg, &end, 8);
846 if (*end!='\0' || end == arg) {
847 return EXIT_FAILURE;
848 }
849 } else {
850 printf("%.3o\n", (unsigned int) (new_umask=umask(0)));
851 }
852 umask(new_umask);
853 return EXIT_SUCCESS;
854 }
855
856 /* built-in 'unset VAR' handler */
857 static int builtin_unset(struct child_prog *child)
858 {
859 /* bash returned already true */
860 unset_local_var(child->argv[1]);
861 return EXIT_SUCCESS;
862 }
863
864 static int builtin_not_written(struct child_prog *child)
865 {
866 printf("builtin_%s not written\n",child->argv[0]);
867 return EXIT_FAILURE;
868 }
869 #endif
870
871 static int b_check_space(o_string *o, int len)
872 {
873 /* It would be easy to drop a more restrictive policy
874 * in here, such as setting a maximum string length */
875 if (o->length + len > o->maxlen) {
876 char *old_data = o->data;
877 /* assert (data == NULL || o->maxlen != 0); */
878 o->maxlen += max(2*len, B_CHUNK);
879 o->data = realloc(o->data, 1 + o->maxlen);
880 if (o->data == NULL) {
881 free(old_data);
882 }
883 }
884 return o->data == NULL;
885 }
886
887 static int b_addchr(o_string *o, int ch)
888 {
889 debug_printf("b_addchr: %c %d %p\n", ch, o->length, o);
890 if (b_check_space(o, 1)) return B_NOSPAC;
891 o->data[o->length] = ch;
892 o->length++;
893 o->data[o->length] = '\0';
894 return 0;
895 }
896
897 static void b_reset(o_string *o)
898 {
899 o->length = 0;
900 o->nonnull = 0;
901 if (o->data != NULL) *o->data = '\0';
902 }
903
904 static void b_free(o_string *o)
905 {
906 b_reset(o);
907 free(o->data);
908 o->data = NULL;
909 o->maxlen = 0;
910 }
911
912 /* My analysis of quoting semantics tells me that state information
913 * is associated with a destination, not a source.
914 */
915 static int b_addqchr(o_string *o, int ch, int quote)
916 {
917 if (quote && strchr("*?[\\",ch)) {
918 int rc;
919 rc = b_addchr(o, '\\');
920 if (rc) return rc;
921 }
922 return b_addchr(o, ch);
923 }
924
925 /* belongs in utility.c */
926 char *simple_itoa(unsigned int i)
927 {
928 /* 21 digits plus null terminator, good for 64-bit or smaller ints */
929 static char local[22];
930 char *p = &local[21];
931 *p-- = '\0';
932 do {
933 *p-- = '0' + i % 10;
934 i /= 10;
935 } while (i > 0);
936 return p + 1;
937 }
938
939 static int b_adduint(o_string *o, unsigned int i)
940 {
941 int r;
942 char *p = simple_itoa(i);
943 /* no escape checking necessary */
944 do r=b_addchr(o, *p++); while (r==0 && *p);
945 return r;
946 }
947
948 static int static_get(struct in_str *i)
949 {
950 int ch=*i->p++;
951 if (ch=='\0') return EOF;
952 return ch;
953 }
954
955 static int static_peek(struct in_str *i)
956 {
957 return *i->p;
958 }
959
960 #ifndef __U_BOOT__
961 static inline void cmdedit_set_initial_prompt(void)
962 {
963 #ifndef CONFIG_FEATURE_SH_FANCY_PROMPT
964 PS1 = NULL;
965 #else
966 PS1 = getenv("PS1");
967 if(PS1==0)
968 PS1 = "\\w \\$ ";
969 #endif
970 }
971
972 static inline void setup_prompt_string(int promptmode, char **prompt_str)
973 {
974 debug_printf("setup_prompt_string %d ",promptmode);
975 #ifndef CONFIG_FEATURE_SH_FANCY_PROMPT
976 /* Set up the prompt */
977 if (promptmode == 1) {
978 free(PS1);
979 PS1=xmalloc(strlen(cwd)+4);
980 sprintf(PS1, "%s %s", cwd, ( geteuid() != 0 ) ? "$ ":"# ");
981 *prompt_str = PS1;
982 } else {
983 *prompt_str = PS2;
984 }
985 #else
986 *prompt_str = (promptmode==1)? PS1 : PS2;
987 #endif
988 debug_printf("result %s\n",*prompt_str);
989 }
990 #endif
991
992 static void get_user_input(struct in_str *i)
993 {
994 #ifndef __U_BOOT__
995 char *prompt_str;
996 static char the_command[BUFSIZ];
997
998 setup_prompt_string(i->promptmode, &prompt_str);
999 #ifdef CONFIG_FEATURE_COMMAND_EDITING
1000 /*
1001 ** enable command line editing only while a command line
1002 ** is actually being read; otherwise, we'll end up bequeathing
1003 ** atexit() handlers and other unwanted stuff to our
1004 ** child processes (rob@sysgo.de)
1005 */
1006 cmdedit_read_input(prompt_str, the_command);
1007 #else
1008 fputs(prompt_str, stdout);
1009 fflush(stdout);
1010 the_command[0]=fgetc(i->file);
1011 the_command[1]='\0';
1012 #endif
1013 fflush(stdout);
1014 i->p = the_command;
1015 #else
1016 extern char console_buffer[CFG_CBSIZE];
1017 int n;
1018 static char the_command[CFG_CBSIZE];
1019
1020 i->__promptme = 1;
1021 if (i->promptmode == 1) {
1022 n = readline(CFG_PROMPT);
1023 } else {
1024 n = readline(CFG_PROMPT_HUSH_PS2);
1025 }
1026 if (n == -1 ) {
1027 flag_repeat = 0;
1028 i->__promptme = 0;
1029 }
1030 n = strlen(console_buffer);
1031 console_buffer[n] = '\n';
1032 console_buffer[n+1]= '\0';
1033 if (had_ctrlc()) flag_repeat = 0;
1034 clear_ctrlc();
1035 do_repeat = 0;
1036 if (i->promptmode == 1) {
1037 if (console_buffer[0] == '\n'&& flag_repeat == 0) {
1038 strcpy(the_command,console_buffer);
1039 }
1040 else {
1041 if (console_buffer[0] != '\n') {
1042 strcpy(the_command,console_buffer);
1043 flag_repeat = 1;
1044 }
1045 else {
1046 do_repeat = 1;
1047 }
1048 }
1049 i->p = the_command;
1050 }
1051 else {
1052 if (console_buffer[0] != '\n') {
1053 if (strlen(the_command) + strlen(console_buffer)
1054 < CFG_CBSIZE) {
1055 n = strlen(the_command);
1056 the_command[n-1] = ' ';
1057 strcpy(&the_command[n],console_buffer);
1058 }
1059 else {
1060 the_command[0] = '\n';
1061 the_command[1] = '\0';
1062 flag_repeat = 0;
1063 }
1064 }
1065 if (i->__promptme == 0) {
1066 the_command[0] = '\n';
1067 the_command[1] = '\0';
1068 }
1069 i->p = console_buffer;
1070 }
1071 #endif
1072 }
1073
1074 /* This is the magic location that prints prompts
1075 * and gets data back from the user */
1076 static int file_get(struct in_str *i)
1077 {
1078 int ch;
1079
1080 ch = 0;
1081 /* If there is data waiting, eat it up */
1082 if (i->p && *i->p) {
1083 ch=*i->p++;
1084 } else {
1085 /* need to double check i->file because we might be doing something
1086 * more complicated by now, like sourcing or substituting. */
1087 #ifndef __U_BOOT__
1088 if (i->__promptme && interactive && i->file == stdin) {
1089 while(! i->p || (interactive && strlen(i->p)==0) ) {
1090 #else
1091 while(! i->p || strlen(i->p)==0 ) {
1092 #endif
1093 get_user_input(i);
1094 }
1095 i->promptmode=2;
1096 #ifndef __U_BOOT__
1097 i->__promptme = 0;
1098 #endif
1099 if (i->p && *i->p) {
1100 ch=*i->p++;
1101 }
1102 #ifndef __U_BOOT__
1103 } else {
1104 ch = fgetc(i->file);
1105 }
1106
1107 #endif
1108 debug_printf("b_getch: got a %d\n", ch);
1109 }
1110 #ifndef __U_BOOT__
1111 if (ch == '\n') i->__promptme=1;
1112 #endif
1113 return ch;
1114 }
1115
1116 /* All the callers guarantee this routine will never be
1117 * used right after a newline, so prompting is not needed.
1118 */
1119 static int file_peek(struct in_str *i)
1120 {
1121 #ifndef __U_BOOT__
1122 if (i->p && *i->p) {
1123 #endif
1124 return *i->p;
1125 #ifndef __U_BOOT__
1126 } else {
1127 i->peek_buf[0] = fgetc(i->file);
1128 i->peek_buf[1] = '\0';
1129 i->p = i->peek_buf;
1130 debug_printf("b_peek: got a %d\n", *i->p);
1131 return *i->p;
1132 }
1133 #endif
1134 }
1135
1136 #ifndef __U_BOOT__
1137 static void setup_file_in_str(struct in_str *i, FILE *f)
1138 #else
1139 static void setup_file_in_str(struct in_str *i)
1140 #endif
1141 {
1142 i->peek = file_peek;
1143 i->get = file_get;
1144 i->__promptme=1;
1145 i->promptmode=1;
1146 #ifndef __U_BOOT__
1147 i->file = f;
1148 #endif
1149 i->p = NULL;
1150 }
1151
1152 static void setup_string_in_str(struct in_str *i, const char *s)
1153 {
1154 i->peek = static_peek;
1155 i->get = static_get;
1156 i->__promptme=1;
1157 i->promptmode=1;
1158 i->p = s;
1159 }
1160
1161 #ifndef __U_BOOT__
1162 static void mark_open(int fd)
1163 {
1164 struct close_me *new = xmalloc(sizeof(struct close_me));
1165 new->fd = fd;
1166 new->next = close_me_head;
1167 close_me_head = new;
1168 }
1169
1170 static void mark_closed(int fd)
1171 {
1172 struct close_me *tmp;
1173 if (close_me_head == NULL || close_me_head->fd != fd)
1174 error_msg_and_die("corrupt close_me");
1175 tmp = close_me_head;
1176 close_me_head = close_me_head->next;
1177 free(tmp);
1178 }
1179
1180 static void close_all(void)
1181 {
1182 struct close_me *c;
1183 for (c=close_me_head; c; c=c->next) {
1184 close(c->fd);
1185 }
1186 close_me_head = NULL;
1187 }
1188
1189 /* squirrel != NULL means we squirrel away copies of stdin, stdout,
1190 * and stderr if they are redirected. */
1191 static int setup_redirects(struct child_prog *prog, int squirrel[])
1192 {
1193 int openfd, mode;
1194 struct redir_struct *redir;
1195
1196 for (redir=prog->redirects; redir; redir=redir->next) {
1197 if (redir->dup == -1 && redir->word.gl_pathv == NULL) {
1198 /* something went wrong in the parse. Pretend it didn't happen */
1199 continue;
1200 }
1201 if (redir->dup == -1) {
1202 mode=redir_table[redir->type].mode;
1203 openfd = open(redir->word.gl_pathv[0], mode, 0666);
1204 if (openfd < 0) {
1205 /* this could get lost if stderr has been redirected, but
1206 bash and ash both lose it as well (though zsh doesn't!) */
1207 perror_msg("error opening %s", redir->word.gl_pathv[0]);
1208 return 1;
1209 }
1210 } else {
1211 openfd = redir->dup;
1212 }
1213
1214 if (openfd != redir->fd) {
1215 if (squirrel && redir->fd < 3) {
1216 squirrel[redir->fd] = dup(redir->fd);
1217 }
1218 if (openfd == -3) {
1219 close(openfd);
1220 } else {
1221 dup2(openfd, redir->fd);
1222 if (redir->dup == -1)
1223 close (openfd);
1224 }
1225 }
1226 }
1227 return 0;
1228 }
1229
1230 static void restore_redirects(int squirrel[])
1231 {
1232 int i, fd;
1233 for (i=0; i<3; i++) {
1234 fd = squirrel[i];
1235 if (fd != -1) {
1236 /* No error checking. I sure wouldn't know what
1237 * to do with an error if I found one! */
1238 dup2(fd, i);
1239 close(fd);
1240 }
1241 }
1242 }
1243
1244 /* never returns */
1245 /* XXX no exit() here. If you don't exec, use _exit instead.
1246 * The at_exit handlers apparently confuse the calling process,
1247 * in particular stdin handling. Not sure why? */
1248 static void pseudo_exec(struct child_prog *child)
1249 {
1250 int i, rcode;
1251 char *p;
1252 struct built_in_command *x;
1253 if (child->argv) {
1254 for (i=0; is_assignment(child->argv[i]); i++) {
1255 debug_printf("pid %d environment modification: %s\n",getpid(),child->argv[i]);
1256 p = insert_var_value(child->argv[i]);
1257 putenv(strdup(p));
1258 if (p != child->argv[i]) free(p);
1259 }
1260 child->argv+=i; /* XXX this hack isn't so horrible, since we are about
1261 to exit, and therefore don't need to keep data
1262 structures consistent for free() use. */
1263 /* If a variable is assigned in a forest, and nobody listens,
1264 * was it ever really set?
1265 */
1266 if (child->argv[0] == NULL) {
1267 _exit(EXIT_SUCCESS);
1268 }
1269
1270 /*
1271 * Check if the command matches any of the builtins.
1272 * Depending on context, this might be redundant. But it's
1273 * easier to waste a few CPU cycles than it is to figure out
1274 * if this is one of those cases.
1275 */
1276 for (x = bltins; x->cmd; x++) {
1277 if (strcmp(child->argv[0], x->cmd) == 0 ) {
1278 debug_printf("builtin exec %s\n", child->argv[0]);
1279 rcode = x->function(child);
1280 fflush(stdout);
1281 _exit(rcode);
1282 }
1283 }
1284
1285 /* Check if the command matches any busybox internal commands
1286 * ("applets") here.
1287 * FIXME: This feature is not 100% safe, since
1288 * BusyBox is not fully reentrant, so we have no guarantee the things
1289 * from the .bss are still zeroed, or that things from .data are still
1290 * at their defaults. We could exec ourself from /proc/self/exe, but I
1291 * really dislike relying on /proc for things. We could exec ourself
1292 * from global_argv[0], but if we are in a chroot, we may not be able
1293 * to find ourself... */
1294 #ifdef CONFIG_FEATURE_SH_STANDALONE_SHELL
1295 {
1296 int argc_l;
1297 char** argv_l=child->argv;
1298 char *name = child->argv[0];
1299
1300 #ifdef CONFIG_FEATURE_SH_APPLETS_ALWAYS_WIN
1301 /* Following discussions from November 2000 on the busybox mailing
1302 * list, the default configuration, (without
1303 * get_last_path_component()) lets the user force use of an
1304 * external command by specifying the full (with slashes) filename.
1305 * If you enable CONFIG_FEATURE_SH_APPLETS_ALWAYS_WIN then applets
1306 * _aways_ override external commands, so if you want to run
1307 * /bin/cat, it will use BusyBox cat even if /bin/cat exists on the
1308 * filesystem and is _not_ busybox. Some systems may want this,
1309 * most do not. */
1310 name = get_last_path_component(name);
1311 #endif
1312 /* Count argc for use in a second... */
1313 for(argc_l=0;*argv_l!=NULL; argv_l++, argc_l++);
1314 optind = 1;
1315 debug_printf("running applet %s\n", name);
1316 run_applet_by_name(name, argc_l, child->argv);
1317 }
1318 #endif
1319 debug_printf("exec of %s\n",child->argv[0]);
1320 execvp(child->argv[0],child->argv);
1321 perror_msg("couldn't exec: %s",child->argv[0]);
1322 _exit(1);
1323 } else if (child->group) {
1324 debug_printf("runtime nesting to group\n");
1325 interactive=0; /* crucial!!!! */
1326 rcode = run_list_real(child->group);
1327 /* OK to leak memory by not calling free_pipe_list,
1328 * since this process is about to exit */
1329 _exit(rcode);
1330 } else {
1331 /* Can happen. See what bash does with ">foo" by itself. */
1332 debug_printf("trying to pseudo_exec null command\n");
1333 _exit(EXIT_SUCCESS);
1334 }
1335 }
1336
1337 static void insert_bg_job(struct pipe *pi)
1338 {
1339 struct pipe *thejob;
1340
1341 /* Linear search for the ID of the job to use */
1342 pi->jobid = 1;
1343 for (thejob = job_list; thejob; thejob = thejob->next)
1344 if (thejob->jobid >= pi->jobid)
1345 pi->jobid = thejob->jobid + 1;
1346
1347 /* add thejob to the list of running jobs */
1348 if (!job_list) {
1349 thejob = job_list = xmalloc(sizeof(*thejob));
1350 } else {
1351 for (thejob = job_list; thejob->next; thejob = thejob->next) /* nothing */;
1352 thejob->next = xmalloc(sizeof(*thejob));
1353 thejob = thejob->next;
1354 }
1355
1356 /* physically copy the struct job */
1357 memcpy(thejob, pi, sizeof(struct pipe));
1358 thejob->next = NULL;
1359 thejob->running_progs = thejob->num_progs;
1360 thejob->stopped_progs = 0;
1361 thejob->text = xmalloc(BUFSIZ); /* cmdedit buffer size */
1362
1363 /*if (pi->progs[0] && pi->progs[0].argv && pi->progs[0].argv[0]) */
1364 {
1365 char *bar=thejob->text;
1366 char **foo=pi->progs[0].argv;
1367 while(foo && *foo) {
1368 bar += sprintf(bar, "%s ", *foo++);
1369 }
1370 }
1371
1372 /* we don't wait for background thejobs to return -- append it
1373 to the list of backgrounded thejobs and leave it alone */
1374 printf("[%d] %d\n", thejob->jobid, thejob->progs[0].pid);
1375 last_bg_pid = thejob->progs[0].pid;
1376 last_jobid = thejob->jobid;
1377 }
1378
1379 /* remove a backgrounded job */
1380 static void remove_bg_job(struct pipe *pi)
1381 {
1382 struct pipe *prev_pipe;
1383
1384 if (pi == job_list) {
1385 job_list = pi->next;
1386 } else {
1387 prev_pipe = job_list;
1388 while (prev_pipe->next != pi)
1389 prev_pipe = prev_pipe->next;
1390 prev_pipe->next = pi->next;
1391 }
1392 if (job_list)
1393 last_jobid = job_list->jobid;
1394 else
1395 last_jobid = 0;
1396
1397 pi->stopped_progs = 0;
1398 free_pipe(pi, 0);
1399 free(pi);
1400 }
1401
1402 /* Checks to see if any processes have exited -- if they
1403 have, figure out why and see if a job has completed */
1404 static int checkjobs(struct pipe* fg_pipe)
1405 {
1406 int attributes;
1407 int status;
1408 int prognum = 0;
1409 struct pipe *pi;
1410 pid_t childpid;
1411
1412 attributes = WUNTRACED;
1413 if (fg_pipe==NULL) {
1414 attributes |= WNOHANG;
1415 }
1416
1417 while ((childpid = waitpid(-1, &status, attributes)) > 0) {
1418 if (fg_pipe) {
1419 int i, rcode = 0;
1420 for (i=0; i < fg_pipe->num_progs; i++) {
1421 if (fg_pipe->progs[i].pid == childpid) {
1422 if (i==fg_pipe->num_progs-1)
1423 rcode=WEXITSTATUS(status);
1424 (fg_pipe->num_progs)--;
1425 return(rcode);
1426 }
1427 }
1428 }
1429
1430 for (pi = job_list; pi; pi = pi->next) {
1431 prognum = 0;
1432 while (prognum < pi->num_progs && pi->progs[prognum].pid != childpid) {
1433 prognum++;
1434 }
1435 if (prognum < pi->num_progs)
1436 break;
1437 }
1438
1439 if(pi==NULL) {
1440 debug_printf("checkjobs: pid %d was not in our list!\n", childpid);
1441 continue;
1442 }
1443
1444 if (WIFEXITED(status) || WIFSIGNALED(status)) {
1445 /* child exited */
1446 pi->running_progs--;
1447 pi->progs[prognum].pid = 0;
1448
1449 if (!pi->running_progs) {
1450 printf(JOB_STATUS_FORMAT, pi->jobid, "Done", pi->text);
1451 remove_bg_job(pi);
1452 }
1453 } else {
1454 /* child stopped */
1455 pi->stopped_progs++;
1456 pi->progs[prognum].is_stopped = 1;
1457
1458 #if 0
1459 /* Printing this stuff is a pain, since it tends to
1460 * overwrite the prompt an inconveinient moments. So
1461 * don't do that. */
1462 if (pi->stopped_progs == pi->num_progs) {
1463 printf("\n"JOB_STATUS_FORMAT, pi->jobid, "Stopped", pi->text);
1464 }
1465 #endif
1466 }
1467 }
1468
1469 if (childpid == -1 && errno != ECHILD)
1470 perror_msg("waitpid");
1471
1472 /* move the shell to the foreground */
1473 /*if (interactive && tcsetpgrp(shell_terminal, getpgid(0))) */
1474 /* perror_msg("tcsetpgrp-2"); */
1475 return -1;
1476 }
1477
1478 /* Figure out our controlling tty, checking in order stderr,
1479 * stdin, and stdout. If check_pgrp is set, also check that
1480 * we belong to the foreground process group associated with
1481 * that tty. The value of shell_terminal is needed in order to call
1482 * tcsetpgrp(shell_terminal, ...); */
1483 void controlling_tty(int check_pgrp)
1484 {
1485 pid_t curpgrp;
1486
1487 if ((curpgrp = tcgetpgrp(shell_terminal = 2)) < 0
1488 && (curpgrp = tcgetpgrp(shell_terminal = 0)) < 0
1489 && (curpgrp = tcgetpgrp(shell_terminal = 1)) < 0)
1490 goto shell_terminal_error;
1491
1492 if (check_pgrp && curpgrp != getpgid(0))
1493 goto shell_terminal_error;
1494
1495 return;
1496
1497 shell_terminal_error:
1498 shell_terminal = -1;
1499 return;
1500 }
1501 #endif
1502
1503 /* run_pipe_real() starts all the jobs, but doesn't wait for anything
1504 * to finish. See checkjobs().
1505 *
1506 * return code is normally -1, when the caller has to wait for children
1507 * to finish to determine the exit status of the pipe. If the pipe
1508 * is a simple builtin command, however, the action is done by the
1509 * time run_pipe_real returns, and the exit code is provided as the
1510 * return value.
1511 *
1512 * The input of the pipe is always stdin, the output is always
1513 * stdout. The outpipe[] mechanism in BusyBox-0.48 lash is bogus,
1514 * because it tries to avoid running the command substitution in
1515 * subshell, when that is in fact necessary. The subshell process
1516 * now has its stdout directed to the input of the appropriate pipe,
1517 * so this routine is noticeably simpler.
1518 */
1519 static int run_pipe_real(struct pipe *pi)
1520 {
1521 int i;
1522 #ifndef __U_BOOT__
1523 int nextin, nextout;
1524 int pipefds[2]; /* pipefds[0] is for reading */
1525 struct child_prog *child;
1526 struct built_in_command *x;
1527 char *p;
1528 # if __GNUC__
1529 /* Avoid longjmp clobbering */
1530 (void) &i;
1531 (void) &nextin;
1532 (void) &nextout;
1533 (void) &child;
1534 # endif
1535 #else
1536 int nextin;
1537 int flag = do_repeat ? CMD_FLAG_REPEAT : 0;
1538 struct child_prog *child;
1539 cmd_tbl_t *cmdtp;
1540 char *p;
1541 # if __GNUC__
1542 /* Avoid longjmp clobbering */
1543 (void) &i;
1544 (void) &nextin;
1545 (void) &child;
1546 # endif
1547 #endif /* __U_BOOT__ */
1548
1549 nextin = 0;
1550 #ifndef __U_BOOT__
1551 pi->pgrp = -1;
1552 #endif
1553
1554 /* Check if this is a simple builtin (not part of a pipe).
1555 * Builtins within pipes have to fork anyway, and are handled in
1556 * pseudo_exec. "echo foo | read bar" doesn't work on bash, either.
1557 */
1558 if (pi->num_progs == 1) child = & (pi->progs[0]);
1559 #ifndef __U_BOOT__
1560 if (pi->num_progs == 1 && child->group && child->subshell == 0) {
1561 int squirrel[] = {-1, -1, -1};
1562 int rcode;
1563 debug_printf("non-subshell grouping\n");
1564 setup_redirects(child, squirrel);
1565 /* XXX could we merge code with following builtin case,
1566 * by creating a pseudo builtin that calls run_list_real? */
1567 rcode = run_list_real(child->group);
1568 restore_redirects(squirrel);
1569 #else
1570 if (pi->num_progs == 1 && child->group) {
1571 int rcode;
1572 debug_printf("non-subshell grouping\n");
1573 rcode = run_list_real(child->group);
1574 #endif
1575 return rcode;
1576 } else if (pi->num_progs == 1 && pi->progs[0].argv != NULL) {
1577 for (i=0; is_assignment(child->argv[i]); i++) { /* nothing */ }
1578 if (i!=0 && child->argv[i]==NULL) {
1579 /* assignments, but no command: set the local environment */
1580 for (i=0; child->argv[i]!=NULL; i++) {
1581
1582 /* Ok, this case is tricky. We have to decide if this is a
1583 * local variable, or an already exported variable. If it is
1584 * already exported, we have to export the new value. If it is
1585 * not exported, we need only set this as a local variable.
1586 * This junk is all to decide whether or not to export this
1587 * variable. */
1588 int export_me=0;
1589 char *name, *value;
1590 name = xstrdup(child->argv[i]);
1591 debug_printf("Local environment set: %s\n", name);
1592 value = strchr(name, '=');
1593 if (value)
1594 *value=0;
1595 #ifndef __U_BOOT__
1596 if ( get_local_var(name)) {
1597 export_me=1;
1598 }
1599 #endif
1600 free(name);
1601 p = insert_var_value(child->argv[i]);
1602 set_local_var(p, export_me);
1603 if (p != child->argv[i]) free(p);
1604 }
1605 return EXIT_SUCCESS; /* don't worry about errors in set_local_var() yet */
1606 }
1607 for (i = 0; is_assignment(child->argv[i]); i++) {
1608 p = insert_var_value(child->argv[i]);
1609 #ifndef __U_BOOT__
1610 putenv(strdup(p));
1611 #else
1612 set_local_var(p, 0);
1613 #endif
1614 if (p != child->argv[i]) {
1615 child->sp--;
1616 free(p);
1617 }
1618 }
1619 if (child->sp) {
1620 char * str = NULL;
1621
1622 str = make_string((child->argv + i));
1623 parse_string_outer(str, FLAG_EXIT_FROM_LOOP | FLAG_REPARSING);
1624 free(str);
1625 return last_return_code;
1626 }
1627 #ifndef __U_BOOT__
1628 for (x = bltins; x->cmd; x++) {
1629 if (strcmp(child->argv[i], x->cmd) == 0 ) {
1630 int squirrel[] = {-1, -1, -1};
1631 int rcode;
1632 if (x->function == builtin_exec && child->argv[i+1]==NULL) {
1633 debug_printf("magic exec\n");
1634 setup_redirects(child,NULL);
1635 return EXIT_SUCCESS;
1636 }
1637 debug_printf("builtin inline %s\n", child->argv[0]);
1638 /* XXX setup_redirects acts on file descriptors, not FILEs.
1639 * This is perfect for work that comes after exec().
1640 * Is it really safe for inline use? Experimentally,
1641 * things seem to work with glibc. */
1642 setup_redirects(child, squirrel);
1643 #else
1644 /* check ";", because ,example , argv consist from
1645 * "help;flinfo" must not execute
1646 */
1647 if (strchr(child->argv[i], ';')) {
1648 printf ("Unknown command '%s' - try 'help' or use 'run' command\n",
1649 child->argv[i]);
1650 return -1;
1651 }
1652 /* Look up command in command table */
1653
1654
1655 if ((cmdtp = find_cmd(child->argv[i])) == NULL) {
1656 printf ("Unknown command '%s' - try 'help'\n", child->argv[i]);
1657 return -1; /* give up after bad command */
1658 } else {
1659 int rcode;
1660 #if (CONFIG_COMMANDS & CFG_CMD_BOOTD)
1661 extern int do_bootd (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]);
1662
1663 /* avoid "bootd" recursion */
1664 if (cmdtp->cmd == do_bootd) {
1665 if (flag & CMD_FLAG_BOOTD) {
1666 printf ("'bootd' recursion detected\n");
1667 return -1;
1668 }
1669 else
1670 flag |= CMD_FLAG_BOOTD;
1671 }
1672 #endif /* CFG_CMD_BOOTD */
1673 /* found - check max args */
1674 if ((child->argc - i) > cmdtp->maxargs) {
1675 printf ("Usage:\n%s\n", cmdtp->usage);
1676 return -1;
1677 }
1678 #endif
1679 child->argv+=i; /* XXX horrible hack */
1680 #ifndef __U_BOOT__
1681 rcode = x->function(child);
1682 #else
1683 /* OK - call function to do the command */
1684
1685 rcode = (cmdtp->cmd)
1686 (cmdtp, flag,child->argc-i,&child->argv[i]);
1687 if ( !cmdtp->repeatable )
1688 flag_repeat = 0;
1689
1690
1691 #endif
1692 child->argv-=i; /* XXX restore hack so free() can work right */
1693 #ifndef __U_BOOT__
1694
1695 restore_redirects(squirrel);
1696 #endif
1697
1698 return rcode;
1699 }
1700 }
1701 #ifndef __U_BOOT__
1702 }
1703
1704 for (i = 0; i < pi->num_progs; i++) {
1705 child = & (pi->progs[i]);
1706
1707 /* pipes are inserted between pairs of commands */
1708 if ((i + 1) < pi->num_progs) {
1709 if (pipe(pipefds)<0) perror_msg_and_die("pipe");
1710 nextout = pipefds[1];
1711 } else {
1712 nextout=1;
1713 pipefds[0] = -1;
1714 }
1715
1716 /* XXX test for failed fork()? */
1717 if (!(child->pid = fork())) {
1718 /* Set the handling for job control signals back to the default. */
1719 signal(SIGINT, SIG_DFL);
1720 signal(SIGQUIT, SIG_DFL);
1721 signal(SIGTERM, SIG_DFL);
1722 signal(SIGTSTP, SIG_DFL);
1723 signal(SIGTTIN, SIG_DFL);
1724 signal(SIGTTOU, SIG_DFL);
1725 signal(SIGCHLD, SIG_DFL);
1726
1727 close_all();
1728
1729 if (nextin != 0) {
1730 dup2(nextin, 0);
1731 close(nextin);
1732 }
1733 if (nextout != 1) {
1734 dup2(nextout, 1);
1735 close(nextout);
1736 }
1737 if (pipefds[0]!=-1) {
1738 close(pipefds[0]); /* opposite end of our output pipe */
1739 }
1740
1741 /* Like bash, explicit redirects override pipes,
1742 * and the pipe fd is available for dup'ing. */
1743 setup_redirects(child,NULL);
1744
1745 if (interactive && pi->followup!=PIPE_BG) {
1746 /* If we (the child) win the race, put ourselves in the process
1747 * group whose leader is the first process in this pipe. */
1748 if (pi->pgrp < 0) {
1749 pi->pgrp = getpid();
1750 }
1751 if (setpgid(0, pi->pgrp) == 0) {
1752 tcsetpgrp(2, pi->pgrp);
1753 }
1754 }
1755
1756 pseudo_exec(child);
1757 }
1758
1759
1760 /* put our child in the process group whose leader is the
1761 first process in this pipe */
1762 if (pi->pgrp < 0) {
1763 pi->pgrp = child->pid;
1764 }
1765 /* Don't check for errors. The child may be dead already,
1766 * in which case setpgid returns error code EACCES. */
1767 setpgid(child->pid, pi->pgrp);
1768
1769 if (nextin != 0)
1770 close(nextin);
1771 if (nextout != 1)
1772 close(nextout);
1773
1774 /* If there isn't another process, nextin is garbage
1775 but it doesn't matter */
1776 nextin = pipefds[0];
1777 }
1778 #endif
1779 return -1;
1780 }
1781
1782 static int run_list_real(struct pipe *pi)
1783 {
1784 char *save_name = NULL;
1785 char **list = NULL;
1786 char **save_list = NULL;
1787 struct pipe *rpipe;
1788 int flag_rep = 0;
1789 #ifndef __U_BOOT__
1790 int save_num_progs;
1791 #endif
1792 int rcode=0, flag_skip=1;
1793 int flag_restore = 0;
1794 int if_code=0, next_if_code=0; /* need double-buffer to handle elif */
1795 reserved_style rmode, skip_more_in_this_rmode=RES_XXXX;
1796 /* check syntax for "for" */
1797 for (rpipe = pi; rpipe; rpipe = rpipe->next) {
1798 if ((rpipe->r_mode == RES_IN ||
1799 rpipe->r_mode == RES_FOR) &&
1800 (rpipe->next == NULL)) {
1801 syntax();
1802 #ifdef __U_BOOT__
1803 flag_repeat = 0;
1804 #endif
1805 return 1;
1806 }
1807 if ((rpipe->r_mode == RES_IN &&
1808 (rpipe->next->r_mode == RES_IN &&
1809 rpipe->next->progs->argv != NULL))||
1810 (rpipe->r_mode == RES_FOR &&
1811 rpipe->next->r_mode != RES_IN)) {
1812 syntax();
1813 #ifdef __U_BOOT__
1814 flag_repeat = 0;
1815 #endif
1816 return 1;
1817 }
1818 }
1819 for (; pi; pi = (flag_restore != 0) ? rpipe : pi->next) {
1820 if (pi->r_mode == RES_WHILE || pi->r_mode == RES_UNTIL ||
1821 pi->r_mode == RES_FOR) {
1822 #ifdef __U_BOOT__
1823 /* check Ctrl-C */
1824 ctrlc();
1825 if ((had_ctrlc())) {
1826 return 1;
1827 }
1828 #endif
1829 flag_restore = 0;
1830 if (!rpipe) {
1831 flag_rep = 0;
1832 rpipe = pi;
1833 }
1834 }
1835 rmode = pi->r_mode;
1836 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);
1837 if (rmode == skip_more_in_this_rmode && flag_skip) {
1838 if (pi->followup == PIPE_SEQ) flag_skip=0;
1839 continue;
1840 }
1841 flag_skip = 1;
1842 skip_more_in_this_rmode = RES_XXXX;
1843 if (rmode == RES_THEN || rmode == RES_ELSE) if_code = next_if_code;
1844 if (rmode == RES_THEN && if_code) continue;
1845 if (rmode == RES_ELSE && !if_code) continue;
1846 if (rmode == RES_ELIF && !if_code) continue;
1847 if (rmode == RES_FOR && pi->num_progs) {
1848 if (!list) {
1849 /* if no variable values after "in" we skip "for" */
1850 if (!pi->next->progs->argv) continue;
1851 /* create list of variable values */
1852 list = make_list_in(pi->next->progs->argv,
1853 pi->progs->argv[0]);
1854 save_list = list;
1855 save_name = pi->progs->argv[0];
1856 pi->progs->argv[0] = NULL;
1857 flag_rep = 1;
1858 }
1859 if (!(*list)) {
1860 free(pi->progs->argv[0]);
1861 free(save_list);
1862 list = NULL;
1863 flag_rep = 0;
1864 pi->progs->argv[0] = save_name;
1865 #ifndef __U_BOOT__
1866 pi->progs->glob_result.gl_pathv[0] =
1867 pi->progs->argv[0];
1868 #endif
1869 continue;
1870 } else {
1871 /* insert new value from list for variable */
1872 if (pi->progs->argv[0])
1873 free(pi->progs->argv[0]);
1874 pi->progs->argv[0] = *list++;
1875 #ifndef __U_BOOT__
1876 pi->progs->glob_result.gl_pathv[0] =
1877 pi->progs->argv[0];
1878 #endif
1879 }
1880 }
1881 if (rmode == RES_IN) continue;
1882 if (rmode == RES_DO) {
1883 if (!flag_rep) continue;
1884 }
1885 if ((rmode == RES_DONE)) {
1886 if (flag_rep) {
1887 flag_restore = 1;
1888 } else {
1889 rpipe = NULL;
1890 }
1891 }
1892 if (pi->num_progs == 0) continue;
1893 #ifndef __U_BOOT__
1894 save_num_progs = pi->num_progs; /* save number of programs */
1895 #endif
1896 rcode = run_pipe_real(pi);
1897 debug_printf("run_pipe_real returned %d\n",rcode);
1898 #ifndef __U_BOOT__
1899 if (rcode!=-1) {
1900 /* We only ran a builtin: rcode was set by the return value
1901 * of run_pipe_real(), and we don't need to wait for anything. */
1902 } else if (pi->followup==PIPE_BG) {
1903 /* XXX check bash's behavior with nontrivial pipes */
1904 /* XXX compute jobid */
1905 /* XXX what does bash do with attempts to background builtins? */
1906 insert_bg_job(pi);
1907 rcode = EXIT_SUCCESS;
1908 } else {
1909 if (interactive) {
1910 /* move the new process group into the foreground */
1911 if (tcsetpgrp(shell_terminal, pi->pgrp) && errno != ENOTTY)
1912 perror_msg("tcsetpgrp-3");
1913 rcode = checkjobs(pi);
1914 /* move the shell to the foreground */
1915 if (tcsetpgrp(shell_terminal, getpgid(0)) && errno != ENOTTY)
1916 perror_msg("tcsetpgrp-4");
1917 } else {
1918 rcode = checkjobs(pi);
1919 }
1920 debug_printf("checkjobs returned %d\n",rcode);
1921 }
1922 last_return_code=rcode;
1923 #else
1924 last_return_code=(rcode == 0) ? 0 : 1;
1925 #endif
1926 #ifndef __U_BOOT__
1927 pi->num_progs = save_num_progs; /* restore number of programs */
1928 #endif
1929 if ( rmode == RES_IF || rmode == RES_ELIF )
1930 next_if_code=rcode; /* can be overwritten a number of times */
1931 if (rmode == RES_WHILE)
1932 flag_rep = !last_return_code;
1933 if (rmode == RES_UNTIL)
1934 flag_rep = last_return_code;
1935 if ( (rcode==EXIT_SUCCESS && pi->followup==PIPE_OR) ||
1936 (rcode!=EXIT_SUCCESS && pi->followup==PIPE_AND) )
1937 skip_more_in_this_rmode=rmode;
1938 #ifndef __U_BOOT__
1939 checkjobs(NULL);
1940 #endif
1941 }
1942 return rcode;
1943 }
1944
1945 /* broken, of course, but OK for testing */
1946 static char *indenter(int i)
1947 {
1948 static char blanks[]=" ";
1949 return &blanks[sizeof(blanks)-i-1];
1950 }
1951
1952 /* return code is the exit status of the pipe */
1953 static int free_pipe(struct pipe *pi, int indent)
1954 {
1955 char **p;
1956 struct child_prog *child;
1957 #ifndef __U_BOOT__
1958 struct redir_struct *r, *rnext;
1959 #endif
1960 int a, i, ret_code=0;
1961 char *ind = indenter(indent);
1962
1963 #ifndef __U_BOOT__
1964 if (pi->stopped_progs > 0)
1965 return ret_code;
1966 final_printf("%s run pipe: (pid %d)\n",ind,getpid());
1967 #endif
1968 for (i=0; i<pi->num_progs; i++) {
1969 child = &pi->progs[i];
1970 final_printf("%s command %d:\n",ind,i);
1971 if (child->argv) {
1972 for (a=0,p=child->argv; *p; a++,p++) {
1973 final_printf("%s argv[%d] = %s\n",ind,a,*p);
1974 }
1975 #ifndef __U_BOOT__
1976 globfree(&child->glob_result);
1977 #else
1978 for (a = child->argc;a >= 0;a--) {
1979 free(child->argv[a]);
1980 }
1981 free(child->argv);
1982 child->argc = 0;
1983 #endif
1984 child->argv=NULL;
1985 } else if (child->group) {
1986 #ifndef __U_BOOT__
1987 final_printf("%s begin group (subshell:%d)\n",ind, child->subshell);
1988 #endif
1989 ret_code = free_pipe_list(child->group,indent+3);
1990 final_printf("%s end group\n",ind);
1991 } else {
1992 final_printf("%s (nil)\n",ind);
1993 }
1994 #ifndef __U_BOOT__
1995 for (r=child->redirects; r; r=rnext) {
1996 final_printf("%s redirect %d%s", ind, r->fd, redir_table[r->type].descrip);
1997 if (r->dup == -1) {
1998 /* guard against the case >$FOO, where foo is unset or blank */
1999 if (r->word.gl_pathv) {
2000 final_printf(" %s\n", *r->word.gl_pathv);
2001 globfree(&r->word);
2002 }
2003 } else {
2004 final_printf("&%d\n", r->dup);
2005 }
2006 rnext=r->next;
2007 free(r);
2008 }
2009 child->redirects=NULL;
2010 #endif
2011 }
2012 free(pi->progs); /* children are an array, they get freed all at once */
2013 pi->progs=NULL;
2014 return ret_code;
2015 }
2016
2017 static int free_pipe_list(struct pipe *head, int indent)
2018 {
2019 int rcode=0; /* if list has no members */
2020 struct pipe *pi, *next;
2021 char *ind = indenter(indent);
2022 for (pi=head; pi; pi=next) {
2023 final_printf("%s pipe reserved mode %d\n", ind, pi->r_mode);
2024 rcode = free_pipe(pi, indent);
2025 final_printf("%s pipe followup code %d\n", ind, pi->followup);
2026 next=pi->next;
2027 pi->next=NULL;
2028 free(pi);
2029 }
2030 return rcode;
2031 }
2032
2033 /* Select which version we will use */
2034 static int run_list(struct pipe *pi)
2035 {
2036 int rcode=0;
2037 #ifndef __U_BOOT__
2038 if (fake_mode==0) {
2039 #endif
2040 rcode = run_list_real(pi);
2041 #ifndef __U_BOOT__
2042 }
2043 #endif
2044 /* free_pipe_list has the side effect of clearing memory
2045 * In the long run that function can be merged with run_list_real,
2046 * but doing that now would hobble the debugging effort. */
2047 free_pipe_list(pi,0);
2048 return rcode;
2049 }
2050
2051 /* The API for glob is arguably broken. This routine pushes a non-matching
2052 * string into the output structure, removing non-backslashed backslashes.
2053 * If someone can prove me wrong, by performing this function within the
2054 * original glob(3) api, feel free to rewrite this routine into oblivion.
2055 * Return code (0 vs. GLOB_NOSPACE) matches glob(3).
2056 * XXX broken if the last character is '\\', check that before calling.
2057 */
2058 #ifndef __U_BOOT__
2059 static int globhack(const char *src, int flags, glob_t *pglob)
2060 {
2061 int cnt=0, pathc;
2062 const char *s;
2063 char *dest;
2064 for (cnt=1, s=src; s && *s; s++) {
2065 if (*s == '\\') s++;
2066 cnt++;
2067 }
2068 dest = malloc(cnt);
2069 if (!dest) return GLOB_NOSPACE;
2070 if (!(flags & GLOB_APPEND)) {
2071 pglob->gl_pathv=NULL;
2072 pglob->gl_pathc=0;
2073 pglob->gl_offs=0;
2074 pglob->gl_offs=0;
2075 }
2076 pathc = ++pglob->gl_pathc;
2077 pglob->gl_pathv = realloc(pglob->gl_pathv, (pathc+1)*sizeof(*pglob->gl_pathv));
2078 if (pglob->gl_pathv == NULL) return GLOB_NOSPACE;
2079 pglob->gl_pathv[pathc-1]=dest;
2080 pglob->gl_pathv[pathc]=NULL;
2081 for (s=src; s && *s; s++, dest++) {
2082 if (*s == '\\') s++;
2083 *dest = *s;
2084 }
2085 *dest='\0';
2086 return 0;
2087 }
2088
2089 /* XXX broken if the last character is '\\', check that before calling */
2090 static int glob_needed(const char *s)
2091 {
2092 for (; *s; s++) {
2093 if (*s == '\\') s++;
2094 if (strchr("*[?",*s)) return 1;
2095 }
2096 return 0;
2097 }
2098
2099 #if 0
2100 static void globprint(glob_t *pglob)
2101 {
2102 int i;
2103 debug_printf("glob_t at %p:\n", pglob);
2104 debug_printf(" gl_pathc=%d gl_pathv=%p gl_offs=%d gl_flags=%d\n",
2105 pglob->gl_pathc, pglob->gl_pathv, pglob->gl_offs, pglob->gl_flags);
2106 for (i=0; i<pglob->gl_pathc; i++)
2107 debug_printf("pglob->gl_pathv[%d] = %p = %s\n", i,
2108 pglob->gl_pathv[i], pglob->gl_pathv[i]);
2109 }
2110 #endif
2111
2112 static int xglob(o_string *dest, int flags, glob_t *pglob)
2113 {
2114 int gr;
2115
2116 /* short-circuit for null word */
2117 /* we can code this better when the debug_printf's are gone */
2118 if (dest->length == 0) {
2119 if (dest->nonnull) {
2120 /* bash man page calls this an "explicit" null */
2121 gr = globhack(dest->data, flags, pglob);
2122 debug_printf("globhack returned %d\n",gr);
2123 } else {
2124 return 0;
2125 }
2126 } else if (glob_needed(dest->data)) {
2127 gr = glob(dest->data, flags, NULL, pglob);
2128 debug_printf("glob returned %d\n",gr);
2129 if (gr == GLOB_NOMATCH) {
2130 /* quote removal, or more accurately, backslash removal */
2131 gr = globhack(dest->data, flags, pglob);
2132 debug_printf("globhack returned %d\n",gr);
2133 }
2134 } else {
2135 gr = globhack(dest->data, flags, pglob);
2136 debug_printf("globhack returned %d\n",gr);
2137 }
2138 if (gr == GLOB_NOSPACE)
2139 error_msg_and_die("out of memory during glob");
2140 if (gr != 0) { /* GLOB_ABORTED ? */
2141 error_msg("glob(3) error %d",gr);
2142 }
2143 /* globprint(glob_target); */
2144 return gr;
2145 }
2146 #endif
2147
2148 /* This is used to get/check local shell variables */
2149 static char *get_local_var(const char *s)
2150 {
2151 struct variables *cur;
2152
2153 if (!s)
2154 return NULL;
2155 for (cur = top_vars; cur; cur=cur->next)
2156 if(strcmp(cur->name, s)==0)
2157 return cur->value;
2158 return NULL;
2159 }
2160
2161 /* This is used to set local shell variables
2162 flg_export==0 if only local (not exporting) variable
2163 flg_export==1 if "new" exporting environ
2164 flg_export>1 if current startup environ (not call putenv()) */
2165 static int set_local_var(const char *s, int flg_export)
2166 {
2167 char *name, *value;
2168 int result=0;
2169 struct variables *cur;
2170
2171 name=strdup(s);
2172
2173 #ifdef __U_BOOT__
2174 if (getenv(name) != NULL) {
2175 printf ("ERROR: "
2176 "There is a global environmet variable with the same name.\n");
2177 return -1;
2178 }
2179 #endif
2180 /* Assume when we enter this function that we are already in
2181 * NAME=VALUE format. So the first order of business is to
2182 * split 's' on the '=' into 'name' and 'value' */
2183 value = strchr(name, '=');
2184 if (value==0 && ++value==0) {
2185 free(name);
2186 return -1;
2187 }
2188 *value++ = 0;
2189
2190 for(cur = top_vars; cur; cur = cur->next) {
2191 if(strcmp(cur->name, name)==0)
2192 break;
2193 }
2194
2195 if(cur) {
2196 if(strcmp(cur->value, value)==0) {
2197 if(flg_export>0 && cur->flg_export==0)
2198 cur->flg_export=flg_export;
2199 else
2200 result++;
2201 } else {
2202 if(cur->flg_read_only) {
2203 error_msg("%s: readonly variable", name);
2204 result = -1;
2205 } else {
2206 if(flg_export>0 || cur->flg_export>1)
2207 cur->flg_export=1;
2208 free(cur->value);
2209
2210 cur->value = strdup(value);
2211 }
2212 }
2213 } else {
2214 cur = malloc(sizeof(struct variables));
2215 if(!cur) {
2216 result = -1;
2217 } else {
2218 cur->name = strdup(name);
2219 if(cur->name == 0) {
2220 free(cur);
2221 result = -1;
2222 } else {
2223 struct variables *bottom = top_vars;
2224 cur->value = strdup(value);
2225 cur->next = 0;
2226 cur->flg_export = flg_export;
2227 cur->flg_read_only = 0;
2228 while(bottom->next) bottom=bottom->next;
2229 bottom->next = cur;
2230 }
2231 }
2232 }
2233
2234 #ifndef __U_BOOT__
2235 if(result==0 && cur->flg_export==1) {
2236 *(value-1) = '=';
2237 result = putenv(name);
2238 } else {
2239 #endif
2240 free(name);
2241 #ifndef __U_BOOT__
2242 if(result>0) /* equivalent to previous set */
2243 result = 0;
2244 }
2245 #endif
2246 return result;
2247 }
2248
2249 #ifndef __U_BOOT__
2250 static void unset_local_var(const char *name)
2251 {
2252 struct variables *cur;
2253
2254 if (name) {
2255 for (cur = top_vars; cur; cur=cur->next) {
2256 if(strcmp(cur->name, name)==0)
2257 break;
2258 }
2259 if(cur!=0) {
2260 struct variables *next = top_vars;
2261 if(cur->flg_read_only) {
2262 error_msg("%s: readonly variable", name);
2263 return;
2264 } else {
2265 if(cur->flg_export)
2266 unsetenv(cur->name);
2267 free(cur->name);
2268 free(cur->value);
2269 while (next->next != cur)
2270 next = next->next;
2271 next->next = cur->next;
2272 }
2273 free(cur);
2274 }
2275 }
2276 }
2277 #endif
2278
2279 static int is_assignment(const char *s)
2280 {
2281 if (s==NULL || !isalpha(*s)) return 0;
2282 ++s;
2283 while(isalnum(*s) || *s=='_') ++s;
2284 return *s=='=';
2285 }
2286
2287 #ifndef __U_BOOT__
2288 /* the src parameter allows us to peek forward to a possible &n syntax
2289 * for file descriptor duplication, e.g., "2>&1".
2290 * Return code is 0 normally, 1 if a syntax error is detected in src.
2291 * Resource errors (in xmalloc) cause the process to exit */
2292 static int setup_redirect(struct p_context *ctx, int fd, redir_type style,
2293 struct in_str *input)
2294 {
2295 struct child_prog *child=ctx->child;
2296 struct redir_struct *redir = child->redirects;
2297 struct redir_struct *last_redir=NULL;
2298
2299 /* Create a new redir_struct and drop it onto the end of the linked list */
2300 while(redir) {
2301 last_redir=redir;
2302 redir=redir->next;
2303 }
2304 redir = xmalloc(sizeof(struct redir_struct));
2305 redir->next=NULL;
2306 redir->word.gl_pathv=NULL;
2307 if (last_redir) {
2308 last_redir->next=redir;
2309 } else {
2310 child->redirects=redir;
2311 }
2312
2313 redir->type=style;
2314 redir->fd= (fd==-1) ? redir_table[style].default_fd : fd ;
2315
2316 debug_printf("Redirect type %d%s\n", redir->fd, redir_table[style].descrip);
2317
2318 /* Check for a '2>&1' type redirect */
2319 redir->dup = redirect_dup_num(input);
2320 if (redir->dup == -2) return 1; /* syntax error */
2321 if (redir->dup != -1) {
2322 /* Erik had a check here that the file descriptor in question
2323 * is legit; I postpone that to "run time"
2324 * A "-" representation of "close me" shows up as a -3 here */
2325 debug_printf("Duplicating redirect '%d>&%d'\n", redir->fd, redir->dup);
2326 } else {
2327 /* We do _not_ try to open the file that src points to,
2328 * since we need to return and let src be expanded first.
2329 * Set ctx->pending_redirect, so we know what to do at the
2330 * end of the next parsed word.
2331 */
2332 ctx->pending_redirect = redir;
2333 }
2334 return 0;
2335 }
2336 #endif
2337
2338 struct pipe *new_pipe(void) {
2339 struct pipe *pi;
2340 pi = xmalloc(sizeof(struct pipe));
2341 pi->num_progs = 0;
2342 pi->progs = NULL;
2343 pi->next = NULL;
2344 pi->followup = 0; /* invalid */
2345 return pi;
2346 }
2347
2348 static void initialize_context(struct p_context *ctx)
2349 {
2350 ctx->pipe=NULL;
2351 #ifndef __U_BOOT__
2352 ctx->pending_redirect=NULL;
2353 #endif
2354 ctx->child=NULL;
2355 ctx->list_head=new_pipe();
2356 ctx->pipe=ctx->list_head;
2357 ctx->w=RES_NONE;
2358 ctx->stack=NULL;
2359 #ifdef __U_BOOT__
2360 ctx->old_flag=0;
2361 #endif
2362 done_command(ctx); /* creates the memory for working child */
2363 }
2364
2365 /* normal return is 0
2366 * if a reserved word is found, and processed, return 1
2367 * should handle if, then, elif, else, fi, for, while, until, do, done.
2368 * case, function, and select are obnoxious, save those for later.
2369 */
2370 struct reserved_combo {
2371 char *literal;
2372 int code;
2373 long flag;
2374 };
2375 /* Mostly a list of accepted follow-up reserved words.
2376 * FLAG_END means we are done with the sequence, and are ready
2377 * to turn the compound list into a command.
2378 * FLAG_START means the word must start a new compound list.
2379 */
2380 static struct reserved_combo reserved_list[] = {
2381 { "if", RES_IF, FLAG_THEN | FLAG_START },
2382 { "then", RES_THEN, FLAG_ELIF | FLAG_ELSE | FLAG_FI },
2383 { "elif", RES_ELIF, FLAG_THEN },
2384 { "else", RES_ELSE, FLAG_FI },
2385 { "fi", RES_FI, FLAG_END },
2386 { "for", RES_FOR, FLAG_IN | FLAG_START },
2387 { "while", RES_WHILE, FLAG_DO | FLAG_START },
2388 { "until", RES_UNTIL, FLAG_DO | FLAG_START },
2389 { "in", RES_IN, FLAG_DO },
2390 { "do", RES_DO, FLAG_DONE },
2391 { "done", RES_DONE, FLAG_END }
2392 };
2393 #define NRES (sizeof(reserved_list)/sizeof(struct reserved_combo))
2394
2395 int reserved_word(o_string *dest, struct p_context *ctx)
2396 {
2397 struct reserved_combo *r;
2398 for (r=reserved_list;
2399 r<reserved_list+NRES; r++) {
2400 if (strcmp(dest->data, r->literal) == 0) {
2401 debug_printf("found reserved word %s, code %d\n",r->literal,r->code);
2402 if (r->flag & FLAG_START) {
2403 struct p_context *new = xmalloc(sizeof(struct p_context));
2404 debug_printf("push stack\n");
2405 if (ctx->w == RES_IN || ctx->w == RES_FOR) {
2406 syntax();
2407 free(new);
2408 ctx->w = RES_SNTX;
2409 b_reset(dest);
2410 return 1;
2411 }
2412 *new = *ctx; /* physical copy */
2413 initialize_context(ctx);
2414 ctx->stack=new;
2415 } else if ( ctx->w == RES_NONE || ! (ctx->old_flag & (1<<r->code))) {
2416 syntax();
2417 ctx->w = RES_SNTX;
2418 b_reset(dest);
2419 return 1;
2420 }
2421 ctx->w=r->code;
2422 ctx->old_flag = r->flag;
2423 if (ctx->old_flag & FLAG_END) {
2424 struct p_context *old;
2425 debug_printf("pop stack\n");
2426 done_pipe(ctx,PIPE_SEQ);
2427 old = ctx->stack;
2428 old->child->group = ctx->list_head;
2429 #ifndef __U_BOOT__
2430 old->child->subshell = 0;
2431 #endif
2432 *ctx = *old; /* physical copy */
2433 free(old);
2434 }
2435 b_reset (dest);
2436 return 1;
2437 }
2438 }
2439 return 0;
2440 }
2441
2442 /* normal return is 0.
2443 * Syntax or xglob errors return 1. */
2444 static int done_word(o_string *dest, struct p_context *ctx)
2445 {
2446 struct child_prog *child=ctx->child;
2447 #ifndef __U_BOOT__
2448 glob_t *glob_target;
2449 int gr, flags = 0;
2450 #else
2451 char *str, *s;
2452 int argc, cnt;
2453 #endif
2454
2455 debug_printf("done_word: %s %p\n", dest->data, child);
2456 if (dest->length == 0 && !dest->nonnull) {
2457 debug_printf(" true null, ignored\n");
2458 return 0;
2459 }
2460 #ifndef __U_BOOT__
2461 if (ctx->pending_redirect) {
2462 glob_target = &ctx->pending_redirect->word;
2463 } else {
2464 #endif
2465 if (child->group) {
2466 syntax();
2467 return 1; /* syntax error, groups and arglists don't mix */
2468 }
2469 if (!child->argv && (ctx->type & FLAG_PARSE_SEMICOLON)) {
2470 debug_printf("checking %s for reserved-ness\n",dest->data);
2471 if (reserved_word(dest,ctx)) return ctx->w==RES_SNTX;
2472 }
2473 #ifndef __U_BOOT__
2474 glob_target = &child->glob_result;
2475 if (child->argv) flags |= GLOB_APPEND;
2476 #else
2477 for (cnt = 1, s = dest->data; s && *s; s++) {
2478 if (*s == '\\') s++;
2479 cnt++;
2480 }
2481 str = malloc(cnt);
2482 if (!str) return 1;
2483 if ( child->argv == NULL) {
2484 child->argc=0;
2485 }
2486 argc = ++child->argc;
2487 child->argv = realloc(child->argv, (argc+1)*sizeof(*child->argv));
2488 if (child->argv == NULL) return 1;
2489 child->argv[argc-1]=str;
2490 child->argv[argc]=NULL;
2491 for (s = dest->data; s && *s; s++,str++) {
2492 if (*s == '\\') s++;
2493 *str = *s;
2494 }
2495 *str = '\0';
2496 #endif
2497 #ifndef __U_BOOT__
2498 }
2499 gr = xglob(dest, flags, glob_target);
2500 if (gr != 0) return 1;
2501 #endif
2502
2503 b_reset(dest);
2504 #ifndef __U_BOOT__
2505 if (ctx->pending_redirect) {
2506 ctx->pending_redirect=NULL;
2507 if (glob_target->gl_pathc != 1) {
2508 error_msg("ambiguous redirect");
2509 return 1;
2510 }
2511 } else {
2512 child->argv = glob_target->gl_pathv;
2513 }
2514 #endif
2515 if (ctx->w == RES_FOR) {
2516 done_word(dest,ctx);
2517 done_pipe(ctx,PIPE_SEQ);
2518 }
2519 return 0;
2520 }
2521
2522 /* The only possible error here is out of memory, in which case
2523 * xmalloc exits. */
2524 static int done_command(struct p_context *ctx)
2525 {
2526 /* The child is really already in the pipe structure, so
2527 * advance the pipe counter and make a new, null child.
2528 * Only real trickiness here is that the uncommitted
2529 * child structure, to which ctx->child points, is not
2530 * counted in pi->num_progs. */
2531 struct pipe *pi=ctx->pipe;
2532 struct child_prog *prog=ctx->child;
2533
2534 if (prog && prog->group == NULL
2535 && prog->argv == NULL
2536 #ifndef __U_BOOT__
2537 && prog->redirects == NULL) {
2538 #else
2539 ) {
2540 #endif
2541 debug_printf("done_command: skipping null command\n");
2542 return 0;
2543 } else if (prog) {
2544 pi->num_progs++;
2545 debug_printf("done_command: num_progs incremented to %d\n",pi->num_progs);
2546 } else {
2547 debug_printf("done_command: initializing\n");
2548 }
2549 pi->progs = xrealloc(pi->progs, sizeof(*pi->progs) * (pi->num_progs+1));
2550
2551 prog = pi->progs + pi->num_progs;
2552 #ifndef __U_BOOT__
2553 prog->redirects = NULL;
2554 #endif
2555 prog->argv = NULL;
2556 #ifndef __U_BOOT__
2557 prog->is_stopped = 0;
2558 #endif
2559 prog->group = NULL;
2560 #ifndef __U_BOOT__
2561 prog->glob_result.gl_pathv = NULL;
2562 prog->family = pi;
2563 #endif
2564 prog->sp = 0;
2565 ctx->child = prog;
2566 prog->type = ctx->type;
2567
2568 /* but ctx->pipe and ctx->list_head remain unchanged */
2569 return 0;
2570 }
2571
2572 static int done_pipe(struct p_context *ctx, pipe_style type)
2573 {
2574 struct pipe *new_p;
2575 done_command(ctx); /* implicit closure of previous command */
2576 debug_printf("done_pipe, type %d\n", type);
2577 ctx->pipe->followup = type;
2578 ctx->pipe->r_mode = ctx->w;
2579 new_p=new_pipe();
2580 ctx->pipe->next = new_p;
2581 ctx->pipe = new_p;
2582 ctx->child = NULL;
2583 done_command(ctx); /* set up new pipe to accept commands */
2584 return 0;
2585 }
2586
2587 #ifndef __U_BOOT__
2588 /* peek ahead in the in_str to find out if we have a "&n" construct,
2589 * as in "2>&1", that represents duplicating a file descriptor.
2590 * returns either -2 (syntax error), -1 (no &), or the number found.
2591 */
2592 static int redirect_dup_num(struct in_str *input)
2593 {
2594 int ch, d=0, ok=0;
2595 ch = b_peek(input);
2596 if (ch != '&') return -1;
2597
2598 b_getch(input); /* get the & */
2599 ch=b_peek(input);
2600 if (ch == '-') {
2601 b_getch(input);
2602 return -3; /* "-" represents "close me" */
2603 }
2604 while (isdigit(ch)) {
2605 d = d*10+(ch-'0');
2606 ok=1;
2607 b_getch(input);
2608 ch = b_peek(input);
2609 }
2610 if (ok) return d;
2611
2612 error_msg("ambiguous redirect");
2613 return -2;
2614 }
2615
2616 /* If a redirect is immediately preceded by a number, that number is
2617 * supposed to tell which file descriptor to redirect. This routine
2618 * looks for such preceding numbers. In an ideal world this routine
2619 * needs to handle all the following classes of redirects...
2620 * echo 2>foo # redirects fd 2 to file "foo", nothing passed to echo
2621 * echo 49>foo # redirects fd 49 to file "foo", nothing passed to echo
2622 * echo -2>foo # redirects fd 1 to file "foo", "-2" passed to echo
2623 * echo 49x>foo # redirects fd 1 to file "foo", "49x" passed to echo
2624 * A -1 output from this program means no valid number was found, so the
2625 * caller should use the appropriate default for this redirection.
2626 */
2627 static int redirect_opt_num(o_string *o)
2628 {
2629 int num;
2630
2631 if (o->length==0) return -1;
2632 for(num=0; num<o->length; num++) {
2633 if (!isdigit(*(o->data+num))) {
2634 return -1;
2635 }
2636 }
2637 /* reuse num (and save an int) */
2638 num=atoi(o->data);
2639 b_reset(o);
2640 return num;
2641 }
2642
2643 FILE *generate_stream_from_list(struct pipe *head)
2644 {
2645 FILE *pf;
2646 #if 1
2647 int pid, channel[2];
2648 if (pipe(channel)<0) perror_msg_and_die("pipe");
2649 pid=fork();
2650 if (pid<0) {
2651 perror_msg_and_die("fork");
2652 } else if (pid==0) {
2653 close(channel[0]);
2654 if (channel[1] != 1) {
2655 dup2(channel[1],1);
2656 close(channel[1]);
2657 }
2658 #if 0
2659 #define SURROGATE "surrogate response"
2660 write(1,SURROGATE,sizeof(SURROGATE));
2661 _exit(run_list(head));
2662 #else
2663 _exit(run_list_real(head)); /* leaks memory */
2664 #endif
2665 }
2666 debug_printf("forked child %d\n",pid);
2667 close(channel[1]);
2668 pf = fdopen(channel[0],"r");
2669 debug_printf("pipe on FILE *%p\n",pf);
2670 #else
2671 free_pipe_list(head,0);
2672 pf=popen("echo surrogate response","r");
2673 debug_printf("started fake pipe on FILE *%p\n",pf);
2674 #endif
2675 return pf;
2676 }
2677
2678 /* this version hacked for testing purposes */
2679 /* return code is exit status of the process that is run. */
2680 static int process_command_subs(o_string *dest, struct p_context *ctx, struct in_str *input, int subst_end)
2681 {
2682 int retcode;
2683 o_string result=NULL_O_STRING;
2684 struct p_context inner;
2685 FILE *p;
2686 struct in_str pipe_str;
2687 initialize_context(&inner);
2688
2689 /* recursion to generate command */
2690 retcode = parse_stream(&result, &inner, input, subst_end);
2691 if (retcode != 0) return retcode; /* syntax error or EOF */
2692 done_word(&result, &inner);
2693 done_pipe(&inner, PIPE_SEQ);
2694 b_free(&result);
2695
2696 p=generate_stream_from_list(inner.list_head);
2697 if (p==NULL) return 1;
2698 mark_open(fileno(p));
2699 setup_file_in_str(&pipe_str, p);
2700
2701 /* now send results of command back into original context */
2702 retcode = parse_stream(dest, ctx, &pipe_str, '\0');
2703 /* XXX In case of a syntax error, should we try to kill the child?
2704 * That would be tough to do right, so just read until EOF. */
2705 if (retcode == 1) {
2706 while (b_getch(&pipe_str)!=EOF) { /* discard */ };
2707 }
2708
2709 debug_printf("done reading from pipe, pclose()ing\n");
2710 /* This is the step that wait()s for the child. Should be pretty
2711 * safe, since we just read an EOF from its stdout. We could try
2712 * to better, by using wait(), and keeping track of background jobs
2713 * at the same time. That would be a lot of work, and contrary
2714 * to the KISS philosophy of this program. */
2715 mark_closed(fileno(p));
2716 retcode=pclose(p);
2717 free_pipe_list(inner.list_head,0);
2718 debug_printf("pclosed, retcode=%d\n",retcode);
2719 /* XXX this process fails to trim a single trailing newline */
2720 return retcode;
2721 }
2722
2723 static int parse_group(o_string *dest, struct p_context *ctx,
2724 struct in_str *input, int ch)
2725 {
2726 int rcode, endch=0;
2727 struct p_context sub;
2728 struct child_prog *child = ctx->child;
2729 if (child->argv) {
2730 syntax();
2731 return 1; /* syntax error, groups and arglists don't mix */
2732 }
2733 initialize_context(&sub);
2734 switch(ch) {
2735 case '(': endch=')'; child->subshell=1; break;
2736 case '{': endch='}'; break;
2737 default: syntax(); /* really logic error */
2738 }
2739 rcode=parse_stream(dest,&sub,input,endch);
2740 done_word(dest,&sub); /* finish off the final word in the subcontext */
2741 done_pipe(&sub, PIPE_SEQ); /* and the final command there, too */
2742 child->group = sub.list_head;
2743 return rcode;
2744 /* child remains "open", available for possible redirects */
2745 }
2746 #endif
2747
2748 /* basically useful version until someone wants to get fancier,
2749 * see the bash man page under "Parameter Expansion" */
2750 static char *lookup_param(char *src)
2751 {
2752 char *p=NULL;
2753 if (src) {
2754 p = getenv(src);
2755 if (!p)
2756 p = get_local_var(src);
2757 }
2758 return p;
2759 }
2760
2761 /* return code: 0 for OK, 1 for syntax error */
2762 static int handle_dollar(o_string *dest, struct p_context *ctx, struct in_str *input)
2763 {
2764 #ifndef __U_BOOT__
2765 int i, advance=0;
2766 #else
2767 int advance=0;
2768 #endif
2769 #ifndef __U_BOOT__
2770 char sep[]=" ";
2771 #endif
2772 int ch = input->peek(input); /* first character after the $ */
2773 debug_printf("handle_dollar: ch=%c\n",ch);
2774 if (isalpha(ch)) {
2775 b_addchr(dest, SPECIAL_VAR_SYMBOL);
2776 ctx->child->sp++;
2777 while(ch=b_peek(input),isalnum(ch) || ch=='_') {
2778 b_getch(input);
2779 b_addchr(dest,ch);
2780 }
2781 b_addchr(dest, SPECIAL_VAR_SYMBOL);
2782 #ifndef __U_BOOT__
2783 } else if (isdigit(ch)) {
2784 i = ch-'0'; /* XXX is $0 special? */
2785 if (i<global_argc) {
2786 parse_string(dest, ctx, global_argv[i]); /* recursion */
2787 }
2788 advance = 1;
2789 #endif
2790 } else switch (ch) {
2791 #ifndef __U_BOOT__
2792 case '$':
2793 b_adduint(dest,getpid());
2794 advance = 1;
2795 break;
2796 case '!':
2797 if (last_bg_pid > 0) b_adduint(dest, last_bg_pid);
2798 advance = 1;
2799 break;
2800 #endif
2801 case '?':
2802 b_adduint(dest,last_return_code);
2803 advance = 1;
2804 break;
2805 #ifndef __U_BOOT__
2806 case '#':
2807 b_adduint(dest,global_argc ? global_argc-1 : 0);
2808 advance = 1;
2809 break;
2810 #endif
2811 case '{':
2812 b_addchr(dest, SPECIAL_VAR_SYMBOL);
2813 ctx->child->sp++;
2814 b_getch(input);
2815 /* XXX maybe someone will try to escape the '}' */
2816 while(ch=b_getch(input),ch!=EOF && ch!='}') {
2817 b_addchr(dest,ch);
2818 }
2819 if (ch != '}') {
2820 syntax();
2821 return 1;
2822 }
2823 b_addchr(dest, SPECIAL_VAR_SYMBOL);
2824 break;
2825 #ifndef __U_BOOT__
2826 case '(':
2827 b_getch(input);
2828 process_command_subs(dest, ctx, input, ')');
2829 break;
2830 case '*':
2831 sep[0]=ifs[0];
2832 for (i=1; i<global_argc; i++) {
2833 parse_string(dest, ctx, global_argv[i]);
2834 if (i+1 < global_argc) parse_string(dest, ctx, sep);
2835 }
2836 break;
2837 case '@':
2838 case '-':
2839 case '_':
2840 /* still unhandled, but should be eventually */
2841 error_msg("unhandled syntax: $%c",ch);
2842 return 1;
2843 break;
2844 #endif
2845 default:
2846 b_addqchr(dest,'$',dest->quote);
2847 }
2848 /* Eat the character if the flag was set. If the compiler
2849 * is smart enough, we could substitute "b_getch(input);"
2850 * for all the "advance = 1;" above, and also end up with
2851 * a nice size-optimized program. Hah! That'll be the day.
2852 */
2853 if (advance) b_getch(input);
2854 return 0;
2855 }
2856
2857 #ifndef __U_BOOT__
2858 int parse_string(o_string *dest, struct p_context *ctx, const char *src)
2859 {
2860 struct in_str foo;
2861 setup_string_in_str(&foo, src);
2862 return parse_stream(dest, ctx, &foo, '\0');
2863 }
2864 #endif
2865
2866 /* return code is 0 for normal exit, 1 for syntax error */
2867 int parse_stream(o_string *dest, struct p_context *ctx,
2868 struct in_str *input, int end_trigger)
2869 {
2870 unsigned int ch, m;
2871 #ifndef __U_BOOT__
2872 int redir_fd;
2873 redir_type redir_style;
2874 #endif
2875 int next;
2876
2877 /* Only double-quote state is handled in the state variable dest->quote.
2878 * A single-quote triggers a bypass of the main loop until its mate is
2879 * found. When recursing, quote state is passed in via dest->quote. */
2880
2881 debug_printf("parse_stream, end_trigger=%d\n",end_trigger);
2882 while ((ch=b_getch(input))!=EOF) {
2883 m = map[ch];
2884 #ifdef __U_BOOT__
2885 if (input->__promptme == 0) return 1;
2886 #endif
2887 next = (ch == '\n') ? 0 : b_peek(input);
2888 debug_printf("parse_stream: ch=%c (%d) m=%d quote=%d\n",
2889 ch,ch,m,dest->quote);
2890 if (m==0 || ((m==1 || m==2) && dest->quote)) {
2891 b_addqchr(dest, ch, dest->quote);
2892 } else {
2893 if (m==2) { /* unquoted IFS */
2894 if (done_word(dest, ctx)) {
2895 return 1;
2896 }
2897 /* If we aren't performing a substitution, treat a newline as a
2898 * command separator. */
2899 if (end_trigger != '\0' && ch=='\n')
2900 done_pipe(ctx,PIPE_SEQ);
2901 }
2902 if (ch == end_trigger && !dest->quote && ctx->w==RES_NONE) {
2903 debug_printf("leaving parse_stream (triggered)\n");
2904 return 0;
2905 }
2906 #if 0
2907 if (ch=='\n') {
2908 /* Yahoo! Time to run with it! */
2909 done_pipe(ctx,PIPE_SEQ);
2910 run_list(ctx->list_head);
2911 initialize_context(ctx);
2912 }
2913 #endif
2914 if (m!=2) switch (ch) {
2915 case '#':
2916 if (dest->length == 0 && !dest->quote) {
2917 while(ch=b_peek(input),ch!=EOF && ch!='\n') { b_getch(input); }
2918 } else {
2919 b_addqchr(dest, ch, dest->quote);
2920 }
2921 break;
2922 case '\\':
2923 if (next == EOF) {
2924 syntax();
2925 return 1;
2926 }
2927 b_addqchr(dest, '\\', dest->quote);
2928 b_addqchr(dest, b_getch(input), dest->quote);
2929 break;
2930 case '$':
2931 if (handle_dollar(dest, ctx, input)!=0) return 1;
2932 break;
2933 case '\'':
2934 dest->nonnull = 1;
2935 while(ch=b_getch(input),ch!=EOF && ch!='\'') {
2936 #ifdef __U_BOOT__
2937 if(input->__promptme == 0) return 1;
2938 #endif
2939 b_addchr(dest,ch);
2940 }
2941 if (ch==EOF) {
2942 syntax();
2943 return 1;
2944 }
2945 break;
2946 case '"':
2947 dest->nonnull = 1;
2948 dest->quote = !dest->quote;
2949 break;
2950 #ifndef __U_BOOT__
2951 case '`':
2952 process_command_subs(dest, ctx, input, '`');
2953 break;
2954 case '>':
2955 redir_fd = redirect_opt_num(dest);
2956 done_word(dest, ctx);
2957 redir_style=REDIRECT_OVERWRITE;
2958 if (next == '>') {
2959 redir_style=REDIRECT_APPEND;
2960 b_getch(input);
2961 } else if (next == '(') {
2962 syntax(); /* until we support >(list) Process Substitution */
2963 return 1;
2964 }
2965 setup_redirect(ctx, redir_fd, redir_style, input);
2966 break;
2967 case '<':
2968 redir_fd = redirect_opt_num(dest);
2969 done_word(dest, ctx);
2970 redir_style=REDIRECT_INPUT;
2971 if (next == '<') {
2972 redir_style=REDIRECT_HEREIS;
2973 b_getch(input);
2974 } else if (next == '>') {
2975 redir_style=REDIRECT_IO;
2976 b_getch(input);
2977 } else if (next == '(') {
2978 syntax(); /* until we support <(list) Process Substitution */
2979 return 1;
2980 }
2981 setup_redirect(ctx, redir_fd, redir_style, input);
2982 break;
2983 #endif
2984 case ';':
2985 done_word(dest, ctx);
2986 done_pipe(ctx,PIPE_SEQ);
2987 break;
2988 case '&':
2989 done_word(dest, ctx);
2990 if (next=='&') {
2991 b_getch(input);
2992 done_pipe(ctx,PIPE_AND);
2993 } else {
2994 #ifndef __U_BOOT__
2995 done_pipe(ctx,PIPE_BG);
2996 #else
2997 syntax_err();
2998 return 1;
2999 #endif
3000 }
3001 break;
3002 case '|':
3003 done_word(dest, ctx);
3004 if (next=='|') {
3005 b_getch(input);
3006 done_pipe(ctx,PIPE_OR);
3007 } else {
3008 /* we could pick up a file descriptor choice here
3009 * with redirect_opt_num(), but bash doesn't do it.
3010 * "echo foo 2| cat" yields "foo 2". */
3011 #ifndef __U_BOOT__
3012 done_command(ctx);
3013 #else
3014 syntax_err();
3015 return 1;
3016 #endif
3017 }
3018 break;
3019 #ifndef __U_BOOT__
3020 case '(':
3021 case '{':
3022 if (parse_group(dest, ctx, input, ch)!=0) return 1;
3023 break;
3024 case ')':
3025 case '}':
3026 syntax(); /* Proper use of this character caught by end_trigger */
3027 return 1;
3028 break;
3029 #endif
3030 default:
3031 syntax(); /* this is really an internal logic error */
3032 return 1;
3033 }
3034 }
3035 }
3036 /* complain if quote? No, maybe we just finished a command substitution
3037 * that was quoted. Example:
3038 * $ echo "`cat foo` plus more"
3039 * and we just got the EOF generated by the subshell that ran "cat foo"
3040 * The only real complaint is if we got an EOF when end_trigger != '\0',
3041 * that is, we were really supposed to get end_trigger, and never got
3042 * one before the EOF. Can't use the standard "syntax error" return code,
3043 * so that parse_stream_outer can distinguish the EOF and exit smoothly. */
3044 debug_printf("leaving parse_stream (EOF)\n");
3045 if (end_trigger != '\0') return -1;
3046 return 0;
3047 }
3048
3049 void mapset(const unsigned char *set, int code)
3050 {
3051 const unsigned char *s;
3052 for (s=set; *s; s++) map[*s] = code;
3053 }
3054
3055 void update_ifs_map(void)
3056 {
3057 /* char *ifs and char map[256] are both globals. */
3058 ifs = getenv("IFS");
3059 if (ifs == NULL) ifs=" \t\n";
3060 /* Precompute a list of 'flow through' behavior so it can be treated
3061 * quickly up front. Computation is necessary because of IFS.
3062 * Special case handling of IFS == " \t\n" is not implemented.
3063 * The map[] array only really needs two bits each, and on most machines
3064 * that would be faster because of the reduced L1 cache footprint.
3065 */
3066 memset(map,0,sizeof(map)); /* most characters flow through always */
3067 #ifndef __U_BOOT__
3068 mapset("\\$'\"`", 3); /* never flow through */
3069 mapset("<>;&|(){}#", 1); /* flow through if quoted */
3070 #else
3071 mapset("\\$'\"", 3); /* never flow through */
3072 mapset(";&|#", 1); /* flow through if quoted */
3073 #endif
3074 mapset(ifs, 2); /* also flow through if quoted */
3075 }
3076
3077 /* most recursion does not come through here, the exeception is
3078 * from builtin_source() */
3079 int parse_stream_outer(struct in_str *inp, int flag)
3080 {
3081
3082 struct p_context ctx;
3083 o_string temp=NULL_O_STRING;
3084 int rcode;
3085 #ifdef __U_BOOT__
3086 int code = 0;
3087 #endif
3088 do {
3089 ctx.type = flag;
3090 initialize_context(&ctx);
3091 update_ifs_map();
3092 if (!(flag & FLAG_PARSE_SEMICOLON) || (flag & FLAG_REPARSING)) mapset(";$&|", 0);
3093 inp->promptmode=1;
3094 rcode = parse_stream(&temp, &ctx, inp, '\n');
3095 #ifdef __U_BOOT__
3096 if (rcode == 1) flag_repeat = 0;
3097 #endif
3098 if (rcode != 1 && ctx.old_flag != 0) {
3099 syntax();
3100 #ifdef __U_BOOT__
3101 flag_repeat = 0;
3102 #endif
3103 }
3104 if (rcode != 1 && ctx.old_flag == 0) {
3105 done_word(&temp, &ctx);
3106 done_pipe(&ctx,PIPE_SEQ);
3107 #ifndef __U_BOOT__
3108 run_list(ctx.list_head);
3109 #else
3110 if (((code = run_list(ctx.list_head)) == -1))
3111 flag_repeat = 0;
3112 #endif
3113 } else {
3114 if (ctx.old_flag != 0) {
3115 free(ctx.stack);
3116 b_reset(&temp);
3117 }
3118 #ifdef __U_BOOT__
3119 if (inp->__promptme == 0) printf("<INTERRUPT>\n");
3120 inp->__promptme = 1;
3121 #endif
3122 temp.nonnull = 0;
3123 temp.quote = 0;
3124 inp->p = NULL;
3125 free_pipe_list(ctx.list_head,0);
3126 }
3127 b_free(&temp);
3128 } while (rcode != -1 && !(flag & FLAG_EXIT_FROM_LOOP)); /* loop on syntax errors, return on EOF */
3129 #ifndef __U_BOOT__
3130 return 0;
3131 #else
3132 return (code != 0) ? 1 : 0;
3133 #endif /* __U_BOOT__ */
3134 }
3135
3136 #ifndef __U_BOOT__
3137 static int parse_string_outer(const char *s, int flag)
3138 #else
3139 int parse_string_outer(char *s, int flag)
3140 #endif /* __U_BOOT__ */
3141 {
3142 struct in_str input;
3143 #ifdef __U_BOOT__
3144 char *p = NULL;
3145 int rcode;
3146 if ( !s || !*s)
3147 return 1;
3148 if (!(p = strchr(s, '\n')) || *++p) {
3149 p = xmalloc(strlen(s) + 2);
3150 strcpy(p, s);
3151 strcat(p, "\n");
3152 setup_string_in_str(&input, p);
3153 rcode = parse_stream_outer(&input, flag);
3154 free(p);
3155 return rcode;
3156 } else {
3157 #endif
3158 setup_string_in_str(&input, s);
3159 return parse_stream_outer(&input, flag);
3160 #ifdef __U_BOOT__
3161 }
3162 #endif
3163 }
3164
3165 #ifndef __U_BOOT__
3166 static int parse_file_outer(FILE *f)
3167 #else
3168 int parse_file_outer(void)
3169 #endif
3170 {
3171 int rcode;
3172 struct in_str input;
3173 #ifndef __U_BOOT__
3174 setup_file_in_str(&input, f);
3175 #else
3176 setup_file_in_str(&input);
3177 #endif
3178 rcode = parse_stream_outer(&input, FLAG_PARSE_SEMICOLON);
3179 return rcode;
3180 }
3181
3182 #ifdef __U_BOOT__
3183 static void u_boot_hush_reloc(void)
3184 {
3185 DECLARE_GLOBAL_DATA_PTR;
3186 unsigned long addr;
3187 struct reserved_combo *r;
3188
3189 for (r=reserved_list; r<reserved_list+NRES; r++) {
3190 addr = (ulong) (r->literal) + gd->reloc_off;
3191 r->literal = (char *)addr;
3192 }
3193 }
3194
3195 int u_boot_hush_start(void)
3196 {
3197 top_vars = malloc(sizeof(struct variables));
3198 top_vars->name = "HUSH_VERSION";
3199 top_vars->value = "0.01";
3200 top_vars->next = 0;
3201 top_vars->flg_export = 0;
3202 top_vars->flg_read_only = 1;
3203 u_boot_hush_reloc();
3204 return 0;
3205 }
3206
3207 static void *xmalloc(size_t size)
3208 {
3209 void *p = NULL;
3210
3211 if (!(p = malloc(size))) {
3212 printf("ERROR : memory not allocated\n");
3213 for(;;);
3214 }
3215 return p;
3216 }
3217
3218 static void *xrealloc(void *ptr, size_t size)
3219 {
3220 void *p = NULL;
3221
3222 if (!(p = realloc(ptr, size))) {
3223 printf("ERROR : memory not allocated\n");
3224 for(;;);
3225 }
3226 return p;
3227 }
3228 #endif /* __U_BOOT__ */
3229
3230 #ifndef __U_BOOT__
3231 /* Make sure we have a controlling tty. If we get started under a job
3232 * aware app (like bash for example), make sure we are now in charge so
3233 * we don't fight over who gets the foreground */
3234 static void setup_job_control(void)
3235 {
3236 static pid_t shell_pgrp;
3237 /* Loop until we are in the foreground. */
3238 while (tcgetpgrp (shell_terminal) != (shell_pgrp = getpgrp ()))
3239 kill (- shell_pgrp, SIGTTIN);
3240
3241 /* Ignore interactive and job-control signals. */
3242 signal(SIGINT, SIG_IGN);
3243 signal(SIGQUIT, SIG_IGN);
3244 signal(SIGTERM, SIG_IGN);
3245 signal(SIGTSTP, SIG_IGN);
3246 signal(SIGTTIN, SIG_IGN);
3247 signal(SIGTTOU, SIG_IGN);
3248 signal(SIGCHLD, SIG_IGN);
3249
3250 /* Put ourselves in our own process group. */
3251 setsid();
3252 shell_pgrp = getpid ();
3253 setpgid (shell_pgrp, shell_pgrp);
3254
3255 /* Grab control of the terminal. */
3256 tcsetpgrp(shell_terminal, shell_pgrp);
3257 }
3258
3259 int hush_main(int argc, char **argv)
3260 {
3261 int opt;
3262 FILE *input;
3263 char **e = environ;
3264
3265 /* XXX what should these be while sourcing /etc/profile? */
3266 global_argc = argc;
3267 global_argv = argv;
3268
3269 /* (re?) initialize globals. Sometimes hush_main() ends up calling
3270 * hush_main(), therefore we cannot rely on the BSS to zero out this
3271 * stuff. Reset these to 0 every time. */
3272 ifs = NULL;
3273 /* map[] is taken care of with call to update_ifs_map() */
3274 fake_mode = 0;
3275 interactive = 0;
3276 close_me_head = NULL;
3277 last_bg_pid = 0;
3278 job_list = NULL;
3279 last_jobid = 0;
3280
3281 /* Initialize some more globals to non-zero values */
3282 set_cwd();
3283 #ifdef CONFIG_FEATURE_COMMAND_EDITING
3284 cmdedit_set_initial_prompt();
3285 #else
3286 PS1 = NULL;
3287 #endif
3288 PS2 = "> ";
3289
3290 /* initialize our shell local variables with the values
3291 * currently living in the environment */
3292 if (e) {
3293 for (; *e; e++)
3294 set_local_var(*e, 2); /* without call putenv() */
3295 }
3296
3297 last_return_code=EXIT_SUCCESS;
3298
3299
3300 if (argv[0] && argv[0][0] == '-') {
3301 debug_printf("\nsourcing /etc/profile\n");
3302 if ((input = fopen("/etc/profile", "r")) != NULL) {
3303 mark_open(fileno(input));
3304 parse_file_outer(input);
3305 mark_closed(fileno(input));
3306 fclose(input);
3307 }
3308 }
3309 input=stdin;
3310
3311 while ((opt = getopt(argc, argv, "c:xif")) > 0) {
3312 switch (opt) {
3313 case 'c':
3314 {
3315 global_argv = argv+optind;
3316 global_argc = argc-optind;
3317 opt = parse_string_outer(optarg, FLAG_PARSE_SEMICOLON);
3318 goto final_return;
3319 }
3320 break;
3321 case 'i':
3322 interactive++;
3323 break;
3324 case 'f':
3325 fake_mode++;
3326 break;
3327 default:
3328 #ifndef BB_VER
3329 fprintf(stderr, "Usage: sh [FILE]...\n"
3330 " or: sh -c command [args]...\n\n");
3331 exit(EXIT_FAILURE);
3332 #else
3333 show_usage();
3334 #endif
3335 }
3336 }
3337 /* A shell is interactive if the `-i' flag was given, or if all of
3338 * the following conditions are met:
3339 * no -c command
3340 * no arguments remaining or the -s flag given
3341 * standard input is a terminal
3342 * standard output is a terminal
3343 * Refer to Posix.2, the description of the `sh' utility. */
3344 if (argv[optind]==NULL && input==stdin &&
3345 isatty(fileno(stdin)) && isatty(fileno(stdout))) {
3346 interactive++;
3347 }
3348
3349 debug_printf("\ninteractive=%d\n", interactive);
3350 if (interactive) {
3351 /* Looks like they want an interactive shell */
3352 #ifndef CONFIG_FEATURE_SH_EXTRA_QUIET
3353 printf( "\n\n" BB_BANNER " hush - the humble shell v0.01 (testing)\n");
3354 printf( "Enter 'help' for a list of built-in commands.\n\n");
3355 #endif
3356 setup_job_control();
3357 }
3358
3359 if (argv[optind]==NULL) {
3360 opt=parse_file_outer(stdin);
3361 goto final_return;
3362 }
3363
3364 debug_printf("\nrunning script '%s'\n", argv[optind]);
3365 global_argv = argv+optind;
3366 global_argc = argc-optind;
3367 input = xfopen(argv[optind], "r");
3368 opt = parse_file_outer(input);
3369
3370 #ifdef CONFIG_FEATURE_CLEAN_UP
3371 fclose(input);
3372 if (cwd && cwd != unknown)
3373 free((char*)cwd);
3374 {
3375 struct variables *cur, *tmp;
3376 for(cur = top_vars; cur; cur = tmp) {
3377 tmp = cur->next;
3378 if (!cur->flg_read_only) {
3379 free(cur->name);
3380 free(cur->value);
3381 free(cur);
3382 }
3383 }
3384 }
3385 #endif
3386
3387 final_return:
3388 return(opt?opt:last_return_code);
3389 }
3390 #endif
3391
3392 static char *insert_var_value(char *inp)
3393 {
3394 int res_str_len = 0;
3395 int len;
3396 int done = 0;
3397 char *p, *p1, *res_str = NULL;
3398
3399 while ((p = strchr(inp, SPECIAL_VAR_SYMBOL))) {
3400 if (p != inp) {
3401 len = p - inp;
3402 res_str = xrealloc(res_str, (res_str_len + len));
3403 strncpy((res_str + res_str_len), inp, len);
3404 res_str_len += len;
3405 }
3406 inp = ++p;
3407 p = strchr(inp, SPECIAL_VAR_SYMBOL);
3408 *p = '\0';
3409 if ((p1 = lookup_param(inp))) {
3410 len = res_str_len + strlen(p1);
3411 res_str = xrealloc(res_str, (1 + len));
3412 strcpy((res_str + res_str_len), p1);
3413 res_str_len = len;
3414 }
3415 *p = SPECIAL_VAR_SYMBOL;
3416 inp = ++p;
3417 done = 1;
3418 }
3419 if (done) {
3420 res_str = xrealloc(res_str, (1 + res_str_len + strlen(inp)));
3421 strcpy((res_str + res_str_len), inp);
3422 while ((p = strchr(res_str, '\n'))) {
3423 *p = ' ';
3424 }
3425 }
3426 return (res_str == NULL) ? inp : res_str;
3427 }
3428
3429 static char **make_list_in(char **inp, char *name)
3430 {
3431 int len, i;
3432 int name_len = strlen(name);
3433 int n = 0;
3434 char **list;
3435 char *p1, *p2, *p3;
3436
3437 /* create list of variable values */
3438 list = xmalloc(sizeof(*list));
3439 for (i = 0; inp[i]; i++) {
3440 p3 = insert_var_value(inp[i]);
3441 p1 = p3;
3442 while (*p1) {
3443 if ((*p1 == ' ')) {
3444 p1++;
3445 continue;
3446 }
3447 if ((p2 = strchr(p1, ' '))) {
3448 len = p2 - p1;
3449 } else {
3450 len = strlen(p1);
3451 p2 = p1 + len;
3452 }
3453 /* we use n + 2 in realloc for list,because we add
3454 * new element and then we will add NULL element */
3455 list = xrealloc(list, sizeof(*list) * (n + 2));
3456 list[n] = xmalloc(2 + name_len + len);
3457 strcpy(list[n], name);
3458 strcat(list[n], "=");
3459 strncat(list[n], p1, len);
3460 list[n++][name_len + len + 1] = '\0';
3461 p1 = p2;
3462 }
3463 if (p3 != inp[i]) free(p3);
3464 }
3465 list[n] = NULL;
3466 return list;
3467 }
3468
3469 /* Make new string for parser */
3470 static char * make_string(char ** inp)
3471 {
3472 char *p;
3473 char *str = NULL;
3474 int n;
3475 int len = 2;
3476
3477 for (n = 0; inp[n]; n++) {
3478 p = insert_var_value(inp[n]);
3479 str = xrealloc(str, (len + strlen(p)));
3480 if (n) {
3481 strcat(str, " ");
3482 } else {
3483 *str = '\0';
3484 }
3485 strcat(str, p);
3486 len = strlen(str) + 3;
3487 if (p != inp[n]) free(p);
3488 }
3489 len = strlen(str);
3490 *(str + len) = '\n';
3491 *(str + len + 1) = '\0';
3492 return str;
3493 }
3494
3495 #endif /* CFG_HUSH_PARSER */
3496 /****************************************************************************/
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