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common/fdt_support.c: avoid unintended return from fdt_fixup_memory_banks()
[people/ms/u-boot.git] / common / hush.c
1 /*
2 * sh.c -- a prototype Bourne shell grammar parser
3 * Intended to follow the original Thompson and Ritchie
4 * "small and simple is beautiful" philosophy, which
5 * incidentally is a good match to today's BusyBox.
6 *
7 * Copyright (C) 2000,2001 Larry Doolittle <larry@doolittle.boa.org>
8 *
9 * Credits:
10 * The parser routines proper are all original material, first
11 * written Dec 2000 and Jan 2001 by Larry Doolittle.
12 * The execution engine, the builtins, and much of the underlying
13 * support has been adapted from busybox-0.49pre's lash,
14 * which is Copyright (C) 2000 by Lineo, Inc., and
15 * written by Erik Andersen <andersen@lineo.com>, <andersee@debian.org>.
16 * That, in turn, is based in part on ladsh.c, by Michael K. Johnson and
17 * Erik W. Troan, which they placed in the public domain. I don't know
18 * how much of the Johnson/Troan code has survived the repeated rewrites.
19 * Other credits:
20 * b_addchr() derived from similar w_addchar function in glibc-2.2
21 * setup_redirect(), redirect_opt_num(), and big chunks of main()
22 * and many builtins derived from contributions by Erik Andersen
23 * miscellaneous bugfixes from Matt Kraai
24 *
25 * There are two big (and related) architecture differences between
26 * this parser and the lash parser. One is that this version is
27 * actually designed from the ground up to understand nearly all
28 * of the Bourne grammar. The second, consequential change is that
29 * the parser and input reader have been turned inside out. Now,
30 * the parser is in control, and asks for input as needed. The old
31 * way had the input reader in control, and it asked for parsing to
32 * take place as needed. The new way makes it much easier to properly
33 * handle the recursion implicit in the various substitutions, especially
34 * across continuation lines.
35 *
36 * Bash grammar not implemented: (how many of these were in original sh?)
37 * $@ (those sure look like weird quoting rules)
38 * $_
39 * ! negation operator for pipes
40 * &> and >& redirection of stdout+stderr
41 * Brace Expansion
42 * Tilde Expansion
43 * fancy forms of Parameter Expansion
44 * aliases
45 * Arithmetic Expansion
46 * <(list) and >(list) Process Substitution
47 * reserved words: case, esac, select, function
48 * Here Documents ( << word )
49 * Functions
50 * Major bugs:
51 * job handling woefully incomplete and buggy
52 * reserved word execution woefully incomplete and buggy
53 * to-do:
54 * port selected bugfixes from post-0.49 busybox lash - done?
55 * finish implementing reserved words: for, while, until, do, done
56 * change { and } from special chars to reserved words
57 * builtins: break, continue, eval, return, set, trap, ulimit
58 * test magic exec
59 * handle children going into background
60 * clean up recognition of null pipes
61 * check setting of global_argc and global_argv
62 * control-C handling, probably with longjmp
63 * follow IFS rules more precisely, including update semantics
64 * figure out what to do with backslash-newline
65 * explain why we use signal instead of sigaction
66 * propagate syntax errors, die on resource errors?
67 * continuation lines, both explicit and implicit - done?
68 * memory leak finding and plugging - done?
69 * more testing, especially quoting rules and redirection
70 * document how quoting rules not precisely followed for variable assignments
71 * maybe change map[] to use 2-bit entries
72 * (eventually) remove all the printf's
73 *
74 * SPDX-License-Identifier: GPL-2.0+
75 */
76
77 #define __U_BOOT__
78 #ifdef __U_BOOT__
79 #include <malloc.h> /* malloc, free, realloc*/
80 #include <linux/ctype.h> /* isalpha, isdigit */
81 #include <common.h> /* readline */
82 #include <hush.h>
83 #include <command.h> /* find_cmd */
84 #ifndef CONFIG_SYS_PROMPT_HUSH_PS2
85 #define CONFIG_SYS_PROMPT_HUSH_PS2 "> "
86 #endif
87 #endif
88 #ifndef __U_BOOT__
89 #include <ctype.h> /* isalpha, isdigit */
90 #include <unistd.h> /* getpid */
91 #include <stdlib.h> /* getenv, atoi */
92 #include <string.h> /* strchr */
93 #include <stdio.h> /* popen etc. */
94 #include <glob.h> /* glob, of course */
95 #include <stdarg.h> /* va_list */
96 #include <errno.h>
97 #include <fcntl.h>
98 #include <getopt.h> /* should be pretty obvious */
99
100 #include <sys/stat.h> /* ulimit */
101 #include <sys/types.h>
102 #include <sys/wait.h>
103 #include <signal.h>
104
105 /* #include <dmalloc.h> */
106
107 #if 1
108 #include "busybox.h"
109 #include "cmdedit.h"
110 #else
111 #define applet_name "hush"
112 #include "standalone.h"
113 #define hush_main main
114 #undef CONFIG_FEATURE_SH_FANCY_PROMPT
115 #define BB_BANNER
116 #endif
117 #endif
118 #define SPECIAL_VAR_SYMBOL 03
119 #define SUBSTED_VAR_SYMBOL 04
120 #ifndef __U_BOOT__
121 #define FLAG_EXIT_FROM_LOOP 1
122 #define FLAG_PARSE_SEMICOLON (1 << 1) /* symbol ';' is special for parser */
123 #define FLAG_REPARSING (1 << 2) /* >= 2nd pass */
124
125 #endif
126
127 #ifdef __U_BOOT__
128 DECLARE_GLOBAL_DATA_PTR;
129
130 #define EXIT_SUCCESS 0
131 #define EOF -1
132 #define syntax() syntax_err()
133 #define xstrdup strdup
134 #define error_msg printf
135 #else
136 typedef enum {
137 REDIRECT_INPUT = 1,
138 REDIRECT_OVERWRITE = 2,
139 REDIRECT_APPEND = 3,
140 REDIRECT_HEREIS = 4,
141 REDIRECT_IO = 5
142 } redir_type;
143
144 /* The descrip member of this structure is only used to make debugging
145 * output pretty */
146 struct {int mode; int default_fd; char *descrip;} redir_table[] = {
147 { 0, 0, "()" },
148 { O_RDONLY, 0, "<" },
149 { O_CREAT|O_TRUNC|O_WRONLY, 1, ">" },
150 { O_CREAT|O_APPEND|O_WRONLY, 1, ">>" },
151 { O_RDONLY, -1, "<<" },
152 { O_RDWR, 1, "<>" }
153 };
154 #endif
155
156 typedef enum {
157 PIPE_SEQ = 1,
158 PIPE_AND = 2,
159 PIPE_OR = 3,
160 PIPE_BG = 4,
161 } pipe_style;
162
163 /* might eventually control execution */
164 typedef enum {
165 RES_NONE = 0,
166 RES_IF = 1,
167 RES_THEN = 2,
168 RES_ELIF = 3,
169 RES_ELSE = 4,
170 RES_FI = 5,
171 RES_FOR = 6,
172 RES_WHILE = 7,
173 RES_UNTIL = 8,
174 RES_DO = 9,
175 RES_DONE = 10,
176 RES_XXXX = 11,
177 RES_IN = 12,
178 RES_SNTX = 13
179 } reserved_style;
180 #define FLAG_END (1<<RES_NONE)
181 #define FLAG_IF (1<<RES_IF)
182 #define FLAG_THEN (1<<RES_THEN)
183 #define FLAG_ELIF (1<<RES_ELIF)
184 #define FLAG_ELSE (1<<RES_ELSE)
185 #define FLAG_FI (1<<RES_FI)
186 #define FLAG_FOR (1<<RES_FOR)
187 #define FLAG_WHILE (1<<RES_WHILE)
188 #define FLAG_UNTIL (1<<RES_UNTIL)
189 #define FLAG_DO (1<<RES_DO)
190 #define FLAG_DONE (1<<RES_DONE)
191 #define FLAG_IN (1<<RES_IN)
192 #define FLAG_START (1<<RES_XXXX)
193
194 /* This holds pointers to the various results of parsing */
195 struct p_context {
196 struct child_prog *child;
197 struct pipe *list_head;
198 struct pipe *pipe;
199 #ifndef __U_BOOT__
200 struct redir_struct *pending_redirect;
201 #endif
202 reserved_style w;
203 int old_flag; /* for figuring out valid reserved words */
204 struct p_context *stack;
205 int type; /* define type of parser : ";$" common or special symbol */
206 /* How about quoting status? */
207 };
208
209 #ifndef __U_BOOT__
210 struct redir_struct {
211 redir_type type; /* type of redirection */
212 int fd; /* file descriptor being redirected */
213 int dup; /* -1, or file descriptor being duplicated */
214 struct redir_struct *next; /* pointer to the next redirect in the list */
215 glob_t word; /* *word.gl_pathv is the filename */
216 };
217 #endif
218
219 struct child_prog {
220 #ifndef __U_BOOT__
221 pid_t pid; /* 0 if exited */
222 #endif
223 char **argv; /* program name and arguments */
224 #ifdef __U_BOOT__
225 int argc; /* number of program arguments */
226 #endif
227 struct pipe *group; /* if non-NULL, first in group or subshell */
228 #ifndef __U_BOOT__
229 int subshell; /* flag, non-zero if group must be forked */
230 struct redir_struct *redirects; /* I/O redirections */
231 glob_t glob_result; /* result of parameter globbing */
232 int is_stopped; /* is the program currently running? */
233 struct pipe *family; /* pointer back to the child's parent pipe */
234 #endif
235 int sp; /* number of SPECIAL_VAR_SYMBOL */
236 int type;
237 };
238
239 struct pipe {
240 #ifndef __U_BOOT__
241 int jobid; /* job number */
242 #endif
243 int num_progs; /* total number of programs in job */
244 #ifndef __U_BOOT__
245 int running_progs; /* number of programs running */
246 char *text; /* name of job */
247 char *cmdbuf; /* buffer various argv's point into */
248 pid_t pgrp; /* process group ID for the job */
249 #endif
250 struct child_prog *progs; /* array of commands in pipe */
251 struct pipe *next; /* to track background commands */
252 #ifndef __U_BOOT__
253 int stopped_progs; /* number of programs alive, but stopped */
254 int job_context; /* bitmask defining current context */
255 #endif
256 pipe_style followup; /* PIPE_BG, PIPE_SEQ, PIPE_OR, PIPE_AND */
257 reserved_style r_mode; /* supports if, for, while, until */
258 };
259
260 #ifndef __U_BOOT__
261 struct close_me {
262 int fd;
263 struct close_me *next;
264 };
265 #endif
266
267 struct variables {
268 char *name;
269 char *value;
270 int flg_export;
271 int flg_read_only;
272 struct variables *next;
273 };
274
275 /* globals, connect us to the outside world
276 * the first three support $?, $#, and $1 */
277 #ifndef __U_BOOT__
278 char **global_argv;
279 unsigned int global_argc;
280 #endif
281 static unsigned int last_return_code;
282 #ifndef __U_BOOT__
283 extern char **environ; /* This is in <unistd.h>, but protected with __USE_GNU */
284 #endif
285
286 /* "globals" within this file */
287 static uchar *ifs;
288 static char map[256];
289 #ifndef __U_BOOT__
290 static int fake_mode;
291 static int interactive;
292 static struct close_me *close_me_head;
293 static const char *cwd;
294 static struct pipe *job_list;
295 static unsigned int last_bg_pid;
296 static unsigned int last_jobid;
297 static unsigned int shell_terminal;
298 static char *PS1;
299 static char *PS2;
300 struct variables shell_ver = { "HUSH_VERSION", "0.01", 1, 1, 0 };
301 struct variables *top_vars = &shell_ver;
302 #else
303 static int flag_repeat = 0;
304 static int do_repeat = 0;
305 static struct variables *top_vars = NULL ;
306 #endif /*__U_BOOT__ */
307
308 #define B_CHUNK (100)
309 #define B_NOSPAC 1
310
311 typedef struct {
312 char *data;
313 int length;
314 int maxlen;
315 int quote;
316 int nonnull;
317 } o_string;
318 #define NULL_O_STRING {NULL,0,0,0,0}
319 /* used for initialization:
320 o_string foo = NULL_O_STRING; */
321
322 /* I can almost use ordinary FILE *. Is open_memstream() universally
323 * available? Where is it documented? */
324 struct in_str {
325 const char *p;
326 #ifndef __U_BOOT__
327 char peek_buf[2];
328 #endif
329 int __promptme;
330 int promptmode;
331 #ifndef __U_BOOT__
332 FILE *file;
333 #endif
334 int (*get) (struct in_str *);
335 int (*peek) (struct in_str *);
336 };
337 #define b_getch(input) ((input)->get(input))
338 #define b_peek(input) ((input)->peek(input))
339
340 #ifndef __U_BOOT__
341 #define JOB_STATUS_FORMAT "[%d] %-22s %.40s\n"
342
343 struct built_in_command {
344 char *cmd; /* name */
345 char *descr; /* description */
346 int (*function) (struct child_prog *); /* function ptr */
347 };
348 #endif
349
350 /* define DEBUG_SHELL for debugging output (obviously ;-)) */
351 #if 0
352 #define DEBUG_SHELL
353 #endif
354
355 /* This should be in utility.c */
356 #ifdef DEBUG_SHELL
357 #ifndef __U_BOOT__
358 static void debug_printf(const char *format, ...)
359 {
360 va_list args;
361 va_start(args, format);
362 vfprintf(stderr, format, args);
363 va_end(args);
364 }
365 #else
366 #define debug_printf(fmt,args...) printf (fmt ,##args)
367 #endif
368 #else
369 static inline void debug_printf(const char *format, ...) { }
370 #endif
371 #define final_printf debug_printf
372
373 #ifdef __U_BOOT__
374 static void syntax_err(void) {
375 printf("syntax error\n");
376 }
377 #else
378 static void __syntax(char *file, int line) {
379 error_msg("syntax error %s:%d", file, line);
380 }
381 #define syntax() __syntax(__FILE__, __LINE__)
382 #endif
383
384 #ifdef __U_BOOT__
385 static void *xmalloc(size_t size);
386 static void *xrealloc(void *ptr, size_t size);
387 #else
388 /* Index of subroutines: */
389 /* function prototypes for builtins */
390 static int builtin_cd(struct child_prog *child);
391 static int builtin_env(struct child_prog *child);
392 static int builtin_eval(struct child_prog *child);
393 static int builtin_exec(struct child_prog *child);
394 static int builtin_exit(struct child_prog *child);
395 static int builtin_export(struct child_prog *child);
396 static int builtin_fg_bg(struct child_prog *child);
397 static int builtin_help(struct child_prog *child);
398 static int builtin_jobs(struct child_prog *child);
399 static int builtin_pwd(struct child_prog *child);
400 static int builtin_read(struct child_prog *child);
401 static int builtin_set(struct child_prog *child);
402 static int builtin_shift(struct child_prog *child);
403 static int builtin_source(struct child_prog *child);
404 static int builtin_umask(struct child_prog *child);
405 static int builtin_unset(struct child_prog *child);
406 static int builtin_not_written(struct child_prog *child);
407 #endif
408 /* o_string manipulation: */
409 static int b_check_space(o_string *o, int len);
410 static int b_addchr(o_string *o, int ch);
411 static void b_reset(o_string *o);
412 static int b_addqchr(o_string *o, int ch, int quote);
413 #ifndef __U_BOOT__
414 static int b_adduint(o_string *o, unsigned int i);
415 #endif
416 /* in_str manipulations: */
417 static int static_get(struct in_str *i);
418 static int static_peek(struct in_str *i);
419 static int file_get(struct in_str *i);
420 static int file_peek(struct in_str *i);
421 #ifndef __U_BOOT__
422 static void setup_file_in_str(struct in_str *i, FILE *f);
423 #else
424 static void setup_file_in_str(struct in_str *i);
425 #endif
426 static void setup_string_in_str(struct in_str *i, const char *s);
427 #ifndef __U_BOOT__
428 /* close_me manipulations: */
429 static void mark_open(int fd);
430 static void mark_closed(int fd);
431 static void close_all(void);
432 #endif
433 /* "run" the final data structures: */
434 static char *indenter(int i);
435 static int free_pipe_list(struct pipe *head, int indent);
436 static int free_pipe(struct pipe *pi, int indent);
437 /* really run the final data structures: */
438 #ifndef __U_BOOT__
439 static int setup_redirects(struct child_prog *prog, int squirrel[]);
440 #endif
441 static int run_list_real(struct pipe *pi);
442 #ifndef __U_BOOT__
443 static void pseudo_exec(struct child_prog *child) __attribute__ ((noreturn));
444 #endif
445 static int run_pipe_real(struct pipe *pi);
446 /* extended glob support: */
447 #ifndef __U_BOOT__
448 static int globhack(const char *src, int flags, glob_t *pglob);
449 static int glob_needed(const char *s);
450 static int xglob(o_string *dest, int flags, glob_t *pglob);
451 #endif
452 /* variable assignment: */
453 static int is_assignment(const char *s);
454 /* data structure manipulation: */
455 #ifndef __U_BOOT__
456 static int setup_redirect(struct p_context *ctx, int fd, redir_type style, struct in_str *input);
457 #endif
458 static void initialize_context(struct p_context *ctx);
459 static int done_word(o_string *dest, struct p_context *ctx);
460 static int done_command(struct p_context *ctx);
461 static int done_pipe(struct p_context *ctx, pipe_style type);
462 /* primary string parsing: */
463 #ifndef __U_BOOT__
464 static int redirect_dup_num(struct in_str *input);
465 static int redirect_opt_num(o_string *o);
466 static int process_command_subs(o_string *dest, struct p_context *ctx, struct in_str *input, int subst_end);
467 static int parse_group(o_string *dest, struct p_context *ctx, struct in_str *input, int ch);
468 #endif
469 static char *lookup_param(char *src);
470 static char *make_string(char **inp);
471 static int handle_dollar(o_string *dest, struct p_context *ctx, struct in_str *input);
472 #ifndef __U_BOOT__
473 static int parse_string(o_string *dest, struct p_context *ctx, const char *src);
474 #endif
475 static int parse_stream(o_string *dest, struct p_context *ctx, struct in_str *input0, int end_trigger);
476 /* setup: */
477 static int parse_stream_outer(struct in_str *inp, int flag);
478 #ifndef __U_BOOT__
479 static int parse_string_outer(const char *s, int flag);
480 static int parse_file_outer(FILE *f);
481 #endif
482 #ifndef __U_BOOT__
483 /* job management: */
484 static int checkjobs(struct pipe* fg_pipe);
485 static void insert_bg_job(struct pipe *pi);
486 static void remove_bg_job(struct pipe *pi);
487 #endif
488 /* local variable support */
489 static char **make_list_in(char **inp, char *name);
490 static char *insert_var_value(char *inp);
491 static char *insert_var_value_sub(char *inp, int tag_subst);
492
493 #ifndef __U_BOOT__
494 /* Table of built-in functions. They can be forked or not, depending on
495 * context: within pipes, they fork. As simple commands, they do not.
496 * When used in non-forking context, they can change global variables
497 * in the parent shell process. If forked, of course they can not.
498 * For example, 'unset foo | whatever' will parse and run, but foo will
499 * still be set at the end. */
500 static struct built_in_command bltins[] = {
501 {"bg", "Resume a job in the background", builtin_fg_bg},
502 {"break", "Exit for, while or until loop", builtin_not_written},
503 {"cd", "Change working directory", builtin_cd},
504 {"continue", "Continue for, while or until loop", builtin_not_written},
505 {"env", "Print all environment variables", builtin_env},
506 {"eval", "Construct and run shell command", builtin_eval},
507 {"exec", "Exec command, replacing this shell with the exec'd process",
508 builtin_exec},
509 {"exit", "Exit from shell()", builtin_exit},
510 {"export", "Set environment variable", builtin_export},
511 {"fg", "Bring job into the foreground", builtin_fg_bg},
512 {"jobs", "Lists the active jobs", builtin_jobs},
513 {"pwd", "Print current directory", builtin_pwd},
514 {"read", "Input environment variable", builtin_read},
515 {"return", "Return from a function", builtin_not_written},
516 {"set", "Set/unset shell local variables", builtin_set},
517 {"shift", "Shift positional parameters", builtin_shift},
518 {"trap", "Trap signals", builtin_not_written},
519 {"ulimit","Controls resource limits", builtin_not_written},
520 {"umask","Sets file creation mask", builtin_umask},
521 {"unset", "Unset environment variable", builtin_unset},
522 {".", "Source-in and run commands in a file", builtin_source},
523 {"help", "List shell built-in commands", builtin_help},
524 {NULL, NULL, NULL}
525 };
526
527 static const char *set_cwd(void)
528 {
529 if(cwd==unknown)
530 cwd = NULL; /* xgetcwd(arg) called free(arg) */
531 cwd = xgetcwd((char *)cwd);
532 if (!cwd)
533 cwd = unknown;
534 return cwd;
535 }
536
537 /* built-in 'eval' handler */
538 static int builtin_eval(struct child_prog *child)
539 {
540 char *str = NULL;
541 int rcode = EXIT_SUCCESS;
542
543 if (child->argv[1]) {
544 str = make_string(child->argv + 1);
545 parse_string_outer(str, FLAG_EXIT_FROM_LOOP |
546 FLAG_PARSE_SEMICOLON);
547 free(str);
548 rcode = last_return_code;
549 }
550 return rcode;
551 }
552
553 /* built-in 'cd <path>' handler */
554 static int builtin_cd(struct child_prog *child)
555 {
556 char *newdir;
557 if (child->argv[1] == NULL)
558 newdir = getenv("HOME");
559 else
560 newdir = child->argv[1];
561 if (chdir(newdir)) {
562 printf("cd: %s: %s\n", newdir, strerror(errno));
563 return EXIT_FAILURE;
564 }
565 set_cwd();
566 return EXIT_SUCCESS;
567 }
568
569 /* built-in 'env' handler */
570 static int builtin_env(struct child_prog *dummy)
571 {
572 char **e = environ;
573 if (e == NULL) return EXIT_FAILURE;
574 for (; *e; e++) {
575 puts(*e);
576 }
577 return EXIT_SUCCESS;
578 }
579
580 /* built-in 'exec' handler */
581 static int builtin_exec(struct child_prog *child)
582 {
583 if (child->argv[1] == NULL)
584 return EXIT_SUCCESS; /* Really? */
585 child->argv++;
586 pseudo_exec(child);
587 /* never returns */
588 }
589
590 /* built-in 'exit' handler */
591 static int builtin_exit(struct child_prog *child)
592 {
593 if (child->argv[1] == NULL)
594 exit(last_return_code);
595 exit (atoi(child->argv[1]));
596 }
597
598 /* built-in 'export VAR=value' handler */
599 static int builtin_export(struct child_prog *child)
600 {
601 int res = 0;
602 char *name = child->argv[1];
603
604 if (name == NULL) {
605 return (builtin_env(child));
606 }
607
608 name = strdup(name);
609
610 if(name) {
611 char *value = strchr(name, '=');
612
613 if (!value) {
614 char *tmp;
615 /* They are exporting something without an =VALUE */
616
617 value = get_local_var(name);
618 if (value) {
619 size_t ln = strlen(name);
620
621 tmp = realloc(name, ln+strlen(value)+2);
622 if(tmp==NULL)
623 res = -1;
624 else {
625 sprintf(tmp+ln, "=%s", value);
626 name = tmp;
627 }
628 } else {
629 /* bash does not return an error when trying to export
630 * an undefined variable. Do likewise. */
631 res = 1;
632 }
633 }
634 }
635 if (res<0)
636 perror_msg("export");
637 else if(res==0)
638 res = set_local_var(name, 1);
639 else
640 res = 0;
641 free(name);
642 return res;
643 }
644
645 /* built-in 'fg' and 'bg' handler */
646 static int builtin_fg_bg(struct child_prog *child)
647 {
648 int i, jobnum;
649 struct pipe *pi=NULL;
650
651 if (!interactive)
652 return EXIT_FAILURE;
653 /* If they gave us no args, assume they want the last backgrounded task */
654 if (!child->argv[1]) {
655 for (pi = job_list; pi; pi = pi->next) {
656 if (pi->jobid == last_jobid) {
657 break;
658 }
659 }
660 if (!pi) {
661 error_msg("%s: no current job", child->argv[0]);
662 return EXIT_FAILURE;
663 }
664 } else {
665 if (sscanf(child->argv[1], "%%%d", &jobnum) != 1) {
666 error_msg("%s: bad argument '%s'", child->argv[0], child->argv[1]);
667 return EXIT_FAILURE;
668 }
669 for (pi = job_list; pi; pi = pi->next) {
670 if (pi->jobid == jobnum) {
671 break;
672 }
673 }
674 if (!pi) {
675 error_msg("%s: %d: no such job", child->argv[0], jobnum);
676 return EXIT_FAILURE;
677 }
678 }
679
680 if (*child->argv[0] == 'f') {
681 /* Put the job into the foreground. */
682 tcsetpgrp(shell_terminal, pi->pgrp);
683 }
684
685 /* Restart the processes in the job */
686 for (i = 0; i < pi->num_progs; i++)
687 pi->progs[i].is_stopped = 0;
688
689 if ( (i=kill(- pi->pgrp, SIGCONT)) < 0) {
690 if (i == ESRCH) {
691 remove_bg_job(pi);
692 } else {
693 perror_msg("kill (SIGCONT)");
694 }
695 }
696
697 pi->stopped_progs = 0;
698 return EXIT_SUCCESS;
699 }
700
701 /* built-in 'help' handler */
702 static int builtin_help(struct child_prog *dummy)
703 {
704 struct built_in_command *x;
705
706 printf("\nBuilt-in commands:\n");
707 printf("-------------------\n");
708 for (x = bltins; x->cmd; x++) {
709 if (x->descr==NULL)
710 continue;
711 printf("%s\t%s\n", x->cmd, x->descr);
712 }
713 printf("\n\n");
714 return EXIT_SUCCESS;
715 }
716
717 /* built-in 'jobs' handler */
718 static int builtin_jobs(struct child_prog *child)
719 {
720 struct pipe *job;
721 char *status_string;
722
723 for (job = job_list; job; job = job->next) {
724 if (job->running_progs == job->stopped_progs)
725 status_string = "Stopped";
726 else
727 status_string = "Running";
728
729 printf(JOB_STATUS_FORMAT, job->jobid, status_string, job->text);
730 }
731 return EXIT_SUCCESS;
732 }
733
734
735 /* built-in 'pwd' handler */
736 static int builtin_pwd(struct child_prog *dummy)
737 {
738 puts(set_cwd());
739 return EXIT_SUCCESS;
740 }
741
742 /* built-in 'read VAR' handler */
743 static int builtin_read(struct child_prog *child)
744 {
745 int res;
746
747 if (child->argv[1]) {
748 char string[BUFSIZ];
749 char *var = 0;
750
751 string[0] = 0; /* In case stdin has only EOF */
752 /* read string */
753 fgets(string, sizeof(string), stdin);
754 chomp(string);
755 var = malloc(strlen(child->argv[1])+strlen(string)+2);
756 if(var) {
757 sprintf(var, "%s=%s", child->argv[1], string);
758 res = set_local_var(var, 0);
759 } else
760 res = -1;
761 if (res)
762 fprintf(stderr, "read: %m\n");
763 free(var); /* So not move up to avoid breaking errno */
764 return res;
765 } else {
766 do res=getchar(); while(res!='\n' && res!=EOF);
767 return 0;
768 }
769 }
770
771 /* built-in 'set VAR=value' handler */
772 static int builtin_set(struct child_prog *child)
773 {
774 char *temp = child->argv[1];
775 struct variables *e;
776
777 if (temp == NULL)
778 for(e = top_vars; e; e=e->next)
779 printf("%s=%s\n", e->name, e->value);
780 else
781 set_local_var(temp, 0);
782
783 return EXIT_SUCCESS;
784 }
785
786
787 /* Built-in 'shift' handler */
788 static int builtin_shift(struct child_prog *child)
789 {
790 int n=1;
791 if (child->argv[1]) {
792 n=atoi(child->argv[1]);
793 }
794 if (n>=0 && n<global_argc) {
795 /* XXX This probably breaks $0 */
796 global_argc -= n;
797 global_argv += n;
798 return EXIT_SUCCESS;
799 } else {
800 return EXIT_FAILURE;
801 }
802 }
803
804 /* Built-in '.' handler (read-in and execute commands from file) */
805 static int builtin_source(struct child_prog *child)
806 {
807 FILE *input;
808 int status;
809
810 if (child->argv[1] == NULL)
811 return EXIT_FAILURE;
812
813 /* XXX search through $PATH is missing */
814 input = fopen(child->argv[1], "r");
815 if (!input) {
816 error_msg("Couldn't open file '%s'", child->argv[1]);
817 return EXIT_FAILURE;
818 }
819
820 /* Now run the file */
821 /* XXX argv and argc are broken; need to save old global_argv
822 * (pointer only is OK!) on this stack frame,
823 * set global_argv=child->argv+1, recurse, and restore. */
824 mark_open(fileno(input));
825 status = parse_file_outer(input);
826 mark_closed(fileno(input));
827 fclose(input);
828 return (status);
829 }
830
831 static int builtin_umask(struct child_prog *child)
832 {
833 mode_t new_umask;
834 const char *arg = child->argv[1];
835 char *end;
836 if (arg) {
837 new_umask=strtoul(arg, &end, 8);
838 if (*end!='\0' || end == arg) {
839 return EXIT_FAILURE;
840 }
841 } else {
842 printf("%.3o\n", (unsigned int) (new_umask=umask(0)));
843 }
844 umask(new_umask);
845 return EXIT_SUCCESS;
846 }
847
848 /* built-in 'unset VAR' handler */
849 static int builtin_unset(struct child_prog *child)
850 {
851 /* bash returned already true */
852 unset_local_var(child->argv[1]);
853 return EXIT_SUCCESS;
854 }
855
856 static int builtin_not_written(struct child_prog *child)
857 {
858 printf("builtin_%s not written\n",child->argv[0]);
859 return EXIT_FAILURE;
860 }
861 #endif
862
863 static int b_check_space(o_string *o, int len)
864 {
865 /* It would be easy to drop a more restrictive policy
866 * in here, such as setting a maximum string length */
867 if (o->length + len > o->maxlen) {
868 char *old_data = o->data;
869 /* assert (data == NULL || o->maxlen != 0); */
870 o->maxlen += max(2*len, B_CHUNK);
871 o->data = realloc(o->data, 1 + o->maxlen);
872 if (o->data == NULL) {
873 free(old_data);
874 }
875 }
876 return o->data == NULL;
877 }
878
879 static int b_addchr(o_string *o, int ch)
880 {
881 debug_printf("b_addchr: %c %d %p\n", ch, o->length, o);
882 if (b_check_space(o, 1)) return B_NOSPAC;
883 o->data[o->length] = ch;
884 o->length++;
885 o->data[o->length] = '\0';
886 return 0;
887 }
888
889 static void b_reset(o_string *o)
890 {
891 o->length = 0;
892 o->nonnull = 0;
893 if (o->data != NULL) *o->data = '\0';
894 }
895
896 static void b_free(o_string *o)
897 {
898 b_reset(o);
899 free(o->data);
900 o->data = NULL;
901 o->maxlen = 0;
902 }
903
904 /* My analysis of quoting semantics tells me that state information
905 * is associated with a destination, not a source.
906 */
907 static int b_addqchr(o_string *o, int ch, int quote)
908 {
909 if (quote && strchr("*?[\\",ch)) {
910 int rc;
911 rc = b_addchr(o, '\\');
912 if (rc) return rc;
913 }
914 return b_addchr(o, ch);
915 }
916
917 #ifndef __U_BOOT__
918 static int b_adduint(o_string *o, unsigned int i)
919 {
920 int r;
921 char *p = simple_itoa(i);
922 /* no escape checking necessary */
923 do r=b_addchr(o, *p++); while (r==0 && *p);
924 return r;
925 }
926 #endif
927
928 static int static_get(struct in_str *i)
929 {
930 int ch = *i->p++;
931 if (ch=='\0') return EOF;
932 return ch;
933 }
934
935 static int static_peek(struct in_str *i)
936 {
937 return *i->p;
938 }
939
940 #ifndef __U_BOOT__
941 static inline void cmdedit_set_initial_prompt(void)
942 {
943 #ifndef CONFIG_FEATURE_SH_FANCY_PROMPT
944 PS1 = NULL;
945 #else
946 PS1 = getenv("PS1");
947 if(PS1==0)
948 PS1 = "\\w \\$ ";
949 #endif
950 }
951
952 static inline void setup_prompt_string(int promptmode, char **prompt_str)
953 {
954 debug_printf("setup_prompt_string %d ",promptmode);
955 #ifndef CONFIG_FEATURE_SH_FANCY_PROMPT
956 /* Set up the prompt */
957 if (promptmode == 1) {
958 free(PS1);
959 PS1=xmalloc(strlen(cwd)+4);
960 sprintf(PS1, "%s %s", cwd, ( geteuid() != 0 ) ? "$ ":"# ");
961 *prompt_str = PS1;
962 } else {
963 *prompt_str = PS2;
964 }
965 #else
966 *prompt_str = (promptmode==1)? PS1 : PS2;
967 #endif
968 debug_printf("result %s\n",*prompt_str);
969 }
970 #endif
971
972 static void get_user_input(struct in_str *i)
973 {
974 #ifndef __U_BOOT__
975 char *prompt_str;
976 static char the_command[BUFSIZ];
977
978 setup_prompt_string(i->promptmode, &prompt_str);
979 #ifdef CONFIG_FEATURE_COMMAND_EDITING
980 /*
981 ** enable command line editing only while a command line
982 ** is actually being read; otherwise, we'll end up bequeathing
983 ** atexit() handlers and other unwanted stuff to our
984 ** child processes (rob@sysgo.de)
985 */
986 cmdedit_read_input(prompt_str, the_command);
987 #else
988 fputs(prompt_str, stdout);
989 fflush(stdout);
990 the_command[0]=fgetc(i->file);
991 the_command[1]='\0';
992 #endif
993 fflush(stdout);
994 i->p = the_command;
995 #else
996 int n;
997 static char the_command[CONFIG_SYS_CBSIZE];
998
999 #ifdef CONFIG_BOOT_RETRY_TIME
1000 # ifndef CONFIG_RESET_TO_RETRY
1001 # error "This currently only works with CONFIG_RESET_TO_RETRY enabled"
1002 # endif
1003 reset_cmd_timeout();
1004 #endif
1005 i->__promptme = 1;
1006 if (i->promptmode == 1) {
1007 n = readline(CONFIG_SYS_PROMPT);
1008 } else {
1009 n = readline(CONFIG_SYS_PROMPT_HUSH_PS2);
1010 }
1011 #ifdef CONFIG_BOOT_RETRY_TIME
1012 if (n == -2) {
1013 puts("\nTimeout waiting for command\n");
1014 # ifdef CONFIG_RESET_TO_RETRY
1015 do_reset(NULL, 0, 0, NULL);
1016 # else
1017 # error "This currently only works with CONFIG_RESET_TO_RETRY enabled"
1018 # endif
1019 }
1020 #endif
1021 if (n == -1 ) {
1022 flag_repeat = 0;
1023 i->__promptme = 0;
1024 }
1025 n = strlen(console_buffer);
1026 console_buffer[n] = '\n';
1027 console_buffer[n+1]= '\0';
1028 if (had_ctrlc()) flag_repeat = 0;
1029 clear_ctrlc();
1030 do_repeat = 0;
1031 if (i->promptmode == 1) {
1032 if (console_buffer[0] == '\n'&& flag_repeat == 0) {
1033 strcpy(the_command,console_buffer);
1034 }
1035 else {
1036 if (console_buffer[0] != '\n') {
1037 strcpy(the_command,console_buffer);
1038 flag_repeat = 1;
1039 }
1040 else {
1041 do_repeat = 1;
1042 }
1043 }
1044 i->p = the_command;
1045 }
1046 else {
1047 if (console_buffer[0] != '\n') {
1048 if (strlen(the_command) + strlen(console_buffer)
1049 < CONFIG_SYS_CBSIZE) {
1050 n = strlen(the_command);
1051 the_command[n-1] = ' ';
1052 strcpy(&the_command[n],console_buffer);
1053 }
1054 else {
1055 the_command[0] = '\n';
1056 the_command[1] = '\0';
1057 flag_repeat = 0;
1058 }
1059 }
1060 if (i->__promptme == 0) {
1061 the_command[0] = '\n';
1062 the_command[1] = '\0';
1063 }
1064 i->p = console_buffer;
1065 }
1066 #endif
1067 }
1068
1069 /* This is the magic location that prints prompts
1070 * and gets data back from the user */
1071 static int file_get(struct in_str *i)
1072 {
1073 int ch;
1074
1075 ch = 0;
1076 /* If there is data waiting, eat it up */
1077 if (i->p && *i->p) {
1078 ch = *i->p++;
1079 } else {
1080 /* need to double check i->file because we might be doing something
1081 * more complicated by now, like sourcing or substituting. */
1082 #ifndef __U_BOOT__
1083 if (i->__promptme && interactive && i->file == stdin) {
1084 while(! i->p || (interactive && strlen(i->p)==0) ) {
1085 #else
1086 while(! i->p || strlen(i->p)==0 ) {
1087 #endif
1088 get_user_input(i);
1089 }
1090 i->promptmode=2;
1091 #ifndef __U_BOOT__
1092 i->__promptme = 0;
1093 #endif
1094 if (i->p && *i->p) {
1095 ch = *i->p++;
1096 }
1097 #ifndef __U_BOOT__
1098 } else {
1099 ch = fgetc(i->file);
1100 }
1101
1102 #endif
1103 debug_printf("b_getch: got a %d\n", ch);
1104 }
1105 #ifndef __U_BOOT__
1106 if (ch == '\n') i->__promptme=1;
1107 #endif
1108 return ch;
1109 }
1110
1111 /* All the callers guarantee this routine will never be
1112 * used right after a newline, so prompting is not needed.
1113 */
1114 static int file_peek(struct in_str *i)
1115 {
1116 #ifndef __U_BOOT__
1117 if (i->p && *i->p) {
1118 #endif
1119 return *i->p;
1120 #ifndef __U_BOOT__
1121 } else {
1122 i->peek_buf[0] = fgetc(i->file);
1123 i->peek_buf[1] = '\0';
1124 i->p = i->peek_buf;
1125 debug_printf("b_peek: got a %d\n", *i->p);
1126 return *i->p;
1127 }
1128 #endif
1129 }
1130
1131 #ifndef __U_BOOT__
1132 static void setup_file_in_str(struct in_str *i, FILE *f)
1133 #else
1134 static void setup_file_in_str(struct in_str *i)
1135 #endif
1136 {
1137 i->peek = file_peek;
1138 i->get = file_get;
1139 i->__promptme=1;
1140 i->promptmode=1;
1141 #ifndef __U_BOOT__
1142 i->file = f;
1143 #endif
1144 i->p = NULL;
1145 }
1146
1147 static void setup_string_in_str(struct in_str *i, const char *s)
1148 {
1149 i->peek = static_peek;
1150 i->get = static_get;
1151 i->__promptme=1;
1152 i->promptmode=1;
1153 i->p = s;
1154 }
1155
1156 #ifndef __U_BOOT__
1157 static void mark_open(int fd)
1158 {
1159 struct close_me *new = xmalloc(sizeof(struct close_me));
1160 new->fd = fd;
1161 new->next = close_me_head;
1162 close_me_head = new;
1163 }
1164
1165 static void mark_closed(int fd)
1166 {
1167 struct close_me *tmp;
1168 if (close_me_head == NULL || close_me_head->fd != fd)
1169 error_msg_and_die("corrupt close_me");
1170 tmp = close_me_head;
1171 close_me_head = close_me_head->next;
1172 free(tmp);
1173 }
1174
1175 static void close_all(void)
1176 {
1177 struct close_me *c;
1178 for (c=close_me_head; c; c=c->next) {
1179 close(c->fd);
1180 }
1181 close_me_head = NULL;
1182 }
1183
1184 /* squirrel != NULL means we squirrel away copies of stdin, stdout,
1185 * and stderr if they are redirected. */
1186 static int setup_redirects(struct child_prog *prog, int squirrel[])
1187 {
1188 int openfd, mode;
1189 struct redir_struct *redir;
1190
1191 for (redir=prog->redirects; redir; redir=redir->next) {
1192 if (redir->dup == -1 && redir->word.gl_pathv == NULL) {
1193 /* something went wrong in the parse. Pretend it didn't happen */
1194 continue;
1195 }
1196 if (redir->dup == -1) {
1197 mode=redir_table[redir->type].mode;
1198 openfd = open(redir->word.gl_pathv[0], mode, 0666);
1199 if (openfd < 0) {
1200 /* this could get lost if stderr has been redirected, but
1201 bash and ash both lose it as well (though zsh doesn't!) */
1202 perror_msg("error opening %s", redir->word.gl_pathv[0]);
1203 return 1;
1204 }
1205 } else {
1206 openfd = redir->dup;
1207 }
1208
1209 if (openfd != redir->fd) {
1210 if (squirrel && redir->fd < 3) {
1211 squirrel[redir->fd] = dup(redir->fd);
1212 }
1213 if (openfd == -3) {
1214 close(openfd);
1215 } else {
1216 dup2(openfd, redir->fd);
1217 if (redir->dup == -1)
1218 close (openfd);
1219 }
1220 }
1221 }
1222 return 0;
1223 }
1224
1225 static void restore_redirects(int squirrel[])
1226 {
1227 int i, fd;
1228 for (i=0; i<3; i++) {
1229 fd = squirrel[i];
1230 if (fd != -1) {
1231 /* No error checking. I sure wouldn't know what
1232 * to do with an error if I found one! */
1233 dup2(fd, i);
1234 close(fd);
1235 }
1236 }
1237 }
1238
1239 /* never returns */
1240 /* XXX no exit() here. If you don't exec, use _exit instead.
1241 * The at_exit handlers apparently confuse the calling process,
1242 * in particular stdin handling. Not sure why? */
1243 static void pseudo_exec(struct child_prog *child)
1244 {
1245 int i, rcode;
1246 char *p;
1247 struct built_in_command *x;
1248 if (child->argv) {
1249 for (i=0; is_assignment(child->argv[i]); i++) {
1250 debug_printf("pid %d environment modification: %s\n",getpid(),child->argv[i]);
1251 p = insert_var_value(child->argv[i]);
1252 putenv(strdup(p));
1253 if (p != child->argv[i]) free(p);
1254 }
1255 child->argv+=i; /* XXX this hack isn't so horrible, since we are about
1256 to exit, and therefore don't need to keep data
1257 structures consistent for free() use. */
1258 /* If a variable is assigned in a forest, and nobody listens,
1259 * was it ever really set?
1260 */
1261 if (child->argv[0] == NULL) {
1262 _exit(EXIT_SUCCESS);
1263 }
1264
1265 /*
1266 * Check if the command matches any of the builtins.
1267 * Depending on context, this might be redundant. But it's
1268 * easier to waste a few CPU cycles than it is to figure out
1269 * if this is one of those cases.
1270 */
1271 for (x = bltins; x->cmd; x++) {
1272 if (strcmp(child->argv[0], x->cmd) == 0 ) {
1273 debug_printf("builtin exec %s\n", child->argv[0]);
1274 rcode = x->function(child);
1275 fflush(stdout);
1276 _exit(rcode);
1277 }
1278 }
1279
1280 /* Check if the command matches any busybox internal commands
1281 * ("applets") here.
1282 * FIXME: This feature is not 100% safe, since
1283 * BusyBox is not fully reentrant, so we have no guarantee the things
1284 * from the .bss are still zeroed, or that things from .data are still
1285 * at their defaults. We could exec ourself from /proc/self/exe, but I
1286 * really dislike relying on /proc for things. We could exec ourself
1287 * from global_argv[0], but if we are in a chroot, we may not be able
1288 * to find ourself... */
1289 #ifdef CONFIG_FEATURE_SH_STANDALONE_SHELL
1290 {
1291 int argc_l;
1292 char** argv_l=child->argv;
1293 char *name = child->argv[0];
1294
1295 #ifdef CONFIG_FEATURE_SH_APPLETS_ALWAYS_WIN
1296 /* Following discussions from November 2000 on the busybox mailing
1297 * list, the default configuration, (without
1298 * get_last_path_component()) lets the user force use of an
1299 * external command by specifying the full (with slashes) filename.
1300 * If you enable CONFIG_FEATURE_SH_APPLETS_ALWAYS_WIN then applets
1301 * _aways_ override external commands, so if you want to run
1302 * /bin/cat, it will use BusyBox cat even if /bin/cat exists on the
1303 * filesystem and is _not_ busybox. Some systems may want this,
1304 * most do not. */
1305 name = get_last_path_component(name);
1306 #endif
1307 /* Count argc for use in a second... */
1308 for(argc_l=0;*argv_l!=NULL; argv_l++, argc_l++);
1309 optind = 1;
1310 debug_printf("running applet %s\n", name);
1311 run_applet_by_name(name, argc_l, child->argv);
1312 }
1313 #endif
1314 debug_printf("exec of %s\n",child->argv[0]);
1315 execvp(child->argv[0],child->argv);
1316 perror_msg("couldn't exec: %s",child->argv[0]);
1317 _exit(1);
1318 } else if (child->group) {
1319 debug_printf("runtime nesting to group\n");
1320 interactive=0; /* crucial!!!! */
1321 rcode = run_list_real(child->group);
1322 /* OK to leak memory by not calling free_pipe_list,
1323 * since this process is about to exit */
1324 _exit(rcode);
1325 } else {
1326 /* Can happen. See what bash does with ">foo" by itself. */
1327 debug_printf("trying to pseudo_exec null command\n");
1328 _exit(EXIT_SUCCESS);
1329 }
1330 }
1331
1332 static void insert_bg_job(struct pipe *pi)
1333 {
1334 struct pipe *thejob;
1335
1336 /* Linear search for the ID of the job to use */
1337 pi->jobid = 1;
1338 for (thejob = job_list; thejob; thejob = thejob->next)
1339 if (thejob->jobid >= pi->jobid)
1340 pi->jobid = thejob->jobid + 1;
1341
1342 /* add thejob to the list of running jobs */
1343 if (!job_list) {
1344 thejob = job_list = xmalloc(sizeof(*thejob));
1345 } else {
1346 for (thejob = job_list; thejob->next; thejob = thejob->next) /* nothing */;
1347 thejob->next = xmalloc(sizeof(*thejob));
1348 thejob = thejob->next;
1349 }
1350
1351 /* physically copy the struct job */
1352 memcpy(thejob, pi, sizeof(struct pipe));
1353 thejob->next = NULL;
1354 thejob->running_progs = thejob->num_progs;
1355 thejob->stopped_progs = 0;
1356 thejob->text = xmalloc(BUFSIZ); /* cmdedit buffer size */
1357
1358 /*if (pi->progs[0] && pi->progs[0].argv && pi->progs[0].argv[0]) */
1359 {
1360 char *bar=thejob->text;
1361 char **foo=pi->progs[0].argv;
1362 while(foo && *foo) {
1363 bar += sprintf(bar, "%s ", *foo++);
1364 }
1365 }
1366
1367 /* we don't wait for background thejobs to return -- append it
1368 to the list of backgrounded thejobs and leave it alone */
1369 printf("[%d] %d\n", thejob->jobid, thejob->progs[0].pid);
1370 last_bg_pid = thejob->progs[0].pid;
1371 last_jobid = thejob->jobid;
1372 }
1373
1374 /* remove a backgrounded job */
1375 static void remove_bg_job(struct pipe *pi)
1376 {
1377 struct pipe *prev_pipe;
1378
1379 if (pi == job_list) {
1380 job_list = pi->next;
1381 } else {
1382 prev_pipe = job_list;
1383 while (prev_pipe->next != pi)
1384 prev_pipe = prev_pipe->next;
1385 prev_pipe->next = pi->next;
1386 }
1387 if (job_list)
1388 last_jobid = job_list->jobid;
1389 else
1390 last_jobid = 0;
1391
1392 pi->stopped_progs = 0;
1393 free_pipe(pi, 0);
1394 free(pi);
1395 }
1396
1397 /* Checks to see if any processes have exited -- if they
1398 have, figure out why and see if a job has completed */
1399 static int checkjobs(struct pipe* fg_pipe)
1400 {
1401 int attributes;
1402 int status;
1403 int prognum = 0;
1404 struct pipe *pi;
1405 pid_t childpid;
1406
1407 attributes = WUNTRACED;
1408 if (fg_pipe==NULL) {
1409 attributes |= WNOHANG;
1410 }
1411
1412 while ((childpid = waitpid(-1, &status, attributes)) > 0) {
1413 if (fg_pipe) {
1414 int i, rcode = 0;
1415 for (i=0; i < fg_pipe->num_progs; i++) {
1416 if (fg_pipe->progs[i].pid == childpid) {
1417 if (i==fg_pipe->num_progs-1)
1418 rcode=WEXITSTATUS(status);
1419 (fg_pipe->num_progs)--;
1420 return(rcode);
1421 }
1422 }
1423 }
1424
1425 for (pi = job_list; pi; pi = pi->next) {
1426 prognum = 0;
1427 while (prognum < pi->num_progs && pi->progs[prognum].pid != childpid) {
1428 prognum++;
1429 }
1430 if (prognum < pi->num_progs)
1431 break;
1432 }
1433
1434 if(pi==NULL) {
1435 debug_printf("checkjobs: pid %d was not in our list!\n", childpid);
1436 continue;
1437 }
1438
1439 if (WIFEXITED(status) || WIFSIGNALED(status)) {
1440 /* child exited */
1441 pi->running_progs--;
1442 pi->progs[prognum].pid = 0;
1443
1444 if (!pi->running_progs) {
1445 printf(JOB_STATUS_FORMAT, pi->jobid, "Done", pi->text);
1446 remove_bg_job(pi);
1447 }
1448 } else {
1449 /* child stopped */
1450 pi->stopped_progs++;
1451 pi->progs[prognum].is_stopped = 1;
1452
1453 #if 0
1454 /* Printing this stuff is a pain, since it tends to
1455 * overwrite the prompt an inconveinient moments. So
1456 * don't do that. */
1457 if (pi->stopped_progs == pi->num_progs) {
1458 printf("\n"JOB_STATUS_FORMAT, pi->jobid, "Stopped", pi->text);
1459 }
1460 #endif
1461 }
1462 }
1463
1464 if (childpid == -1 && errno != ECHILD)
1465 perror_msg("waitpid");
1466
1467 /* move the shell to the foreground */
1468 /*if (interactive && tcsetpgrp(shell_terminal, getpgid(0))) */
1469 /* perror_msg("tcsetpgrp-2"); */
1470 return -1;
1471 }
1472
1473 /* Figure out our controlling tty, checking in order stderr,
1474 * stdin, and stdout. If check_pgrp is set, also check that
1475 * we belong to the foreground process group associated with
1476 * that tty. The value of shell_terminal is needed in order to call
1477 * tcsetpgrp(shell_terminal, ...); */
1478 void controlling_tty(int check_pgrp)
1479 {
1480 pid_t curpgrp;
1481
1482 if ((curpgrp = tcgetpgrp(shell_terminal = 2)) < 0
1483 && (curpgrp = tcgetpgrp(shell_terminal = 0)) < 0
1484 && (curpgrp = tcgetpgrp(shell_terminal = 1)) < 0)
1485 goto shell_terminal_error;
1486
1487 if (check_pgrp && curpgrp != getpgid(0))
1488 goto shell_terminal_error;
1489
1490 return;
1491
1492 shell_terminal_error:
1493 shell_terminal = -1;
1494 return;
1495 }
1496 #endif
1497
1498 /* run_pipe_real() starts all the jobs, but doesn't wait for anything
1499 * to finish. See checkjobs().
1500 *
1501 * return code is normally -1, when the caller has to wait for children
1502 * to finish to determine the exit status of the pipe. If the pipe
1503 * is a simple builtin command, however, the action is done by the
1504 * time run_pipe_real returns, and the exit code is provided as the
1505 * return value.
1506 *
1507 * The input of the pipe is always stdin, the output is always
1508 * stdout. The outpipe[] mechanism in BusyBox-0.48 lash is bogus,
1509 * because it tries to avoid running the command substitution in
1510 * subshell, when that is in fact necessary. The subshell process
1511 * now has its stdout directed to the input of the appropriate pipe,
1512 * so this routine is noticeably simpler.
1513 */
1514 static int run_pipe_real(struct pipe *pi)
1515 {
1516 int i;
1517 #ifndef __U_BOOT__
1518 int nextin, nextout;
1519 int pipefds[2]; /* pipefds[0] is for reading */
1520 struct child_prog *child;
1521 struct built_in_command *x;
1522 char *p;
1523 # if __GNUC__
1524 /* Avoid longjmp clobbering */
1525 (void) &i;
1526 (void) &nextin;
1527 (void) &nextout;
1528 (void) &child;
1529 # endif
1530 #else
1531 int nextin;
1532 int flag = do_repeat ? CMD_FLAG_REPEAT : 0;
1533 struct child_prog *child;
1534 char *p;
1535 # if __GNUC__
1536 /* Avoid longjmp clobbering */
1537 (void) &i;
1538 (void) &nextin;
1539 (void) &child;
1540 # endif
1541 #endif /* __U_BOOT__ */
1542
1543 nextin = 0;
1544 #ifndef __U_BOOT__
1545 pi->pgrp = -1;
1546 #endif
1547
1548 /* Check if this is a simple builtin (not part of a pipe).
1549 * Builtins within pipes have to fork anyway, and are handled in
1550 * pseudo_exec. "echo foo | read bar" doesn't work on bash, either.
1551 */
1552 if (pi->num_progs == 1) child = & (pi->progs[0]);
1553 #ifndef __U_BOOT__
1554 if (pi->num_progs == 1 && child->group && child->subshell == 0) {
1555 int squirrel[] = {-1, -1, -1};
1556 int rcode;
1557 debug_printf("non-subshell grouping\n");
1558 setup_redirects(child, squirrel);
1559 /* XXX could we merge code with following builtin case,
1560 * by creating a pseudo builtin that calls run_list_real? */
1561 rcode = run_list_real(child->group);
1562 restore_redirects(squirrel);
1563 #else
1564 if (pi->num_progs == 1 && child->group) {
1565 int rcode;
1566 debug_printf("non-subshell grouping\n");
1567 rcode = run_list_real(child->group);
1568 #endif
1569 return rcode;
1570 } else if (pi->num_progs == 1 && pi->progs[0].argv != NULL) {
1571 for (i=0; is_assignment(child->argv[i]); i++) { /* nothing */ }
1572 if (i!=0 && child->argv[i]==NULL) {
1573 /* assignments, but no command: set the local environment */
1574 for (i=0; child->argv[i]!=NULL; i++) {
1575
1576 /* Ok, this case is tricky. We have to decide if this is a
1577 * local variable, or an already exported variable. If it is
1578 * already exported, we have to export the new value. If it is
1579 * not exported, we need only set this as a local variable.
1580 * This junk is all to decide whether or not to export this
1581 * variable. */
1582 int export_me=0;
1583 char *name, *value;
1584 name = xstrdup(child->argv[i]);
1585 debug_printf("Local environment set: %s\n", name);
1586 value = strchr(name, '=');
1587 if (value)
1588 *value=0;
1589 #ifndef __U_BOOT__
1590 if ( get_local_var(name)) {
1591 export_me=1;
1592 }
1593 #endif
1594 free(name);
1595 p = insert_var_value(child->argv[i]);
1596 set_local_var(p, export_me);
1597 if (p != child->argv[i]) free(p);
1598 }
1599 return EXIT_SUCCESS; /* don't worry about errors in set_local_var() yet */
1600 }
1601 for (i = 0; is_assignment(child->argv[i]); i++) {
1602 p = insert_var_value(child->argv[i]);
1603 #ifndef __U_BOOT__
1604 putenv(strdup(p));
1605 #else
1606 set_local_var(p, 0);
1607 #endif
1608 if (p != child->argv[i]) {
1609 child->sp--;
1610 free(p);
1611 }
1612 }
1613 if (child->sp) {
1614 char * str = NULL;
1615
1616 str = make_string((child->argv + i));
1617 parse_string_outer(str, FLAG_EXIT_FROM_LOOP | FLAG_REPARSING);
1618 free(str);
1619 return last_return_code;
1620 }
1621 #ifndef __U_BOOT__
1622 for (x = bltins; x->cmd; x++) {
1623 if (strcmp(child->argv[i], x->cmd) == 0 ) {
1624 int squirrel[] = {-1, -1, -1};
1625 int rcode;
1626 if (x->function == builtin_exec && child->argv[i+1]==NULL) {
1627 debug_printf("magic exec\n");
1628 setup_redirects(child,NULL);
1629 return EXIT_SUCCESS;
1630 }
1631 debug_printf("builtin inline %s\n", child->argv[0]);
1632 /* XXX setup_redirects acts on file descriptors, not FILEs.
1633 * This is perfect for work that comes after exec().
1634 * Is it really safe for inline use? Experimentally,
1635 * things seem to work with glibc. */
1636 setup_redirects(child, squirrel);
1637
1638 child->argv += i; /* XXX horrible hack */
1639 rcode = x->function(child);
1640 /* XXX restore hack so free() can work right */
1641 child->argv -= i;
1642 restore_redirects(squirrel);
1643 }
1644 return rcode;
1645 }
1646 #else
1647 /* check ";", because ,example , argv consist from
1648 * "help;flinfo" must not execute
1649 */
1650 if (strchr(child->argv[i], ';')) {
1651 printf("Unknown command '%s' - try 'help' or use "
1652 "'run' command\n", child->argv[i]);
1653 return -1;
1654 }
1655 /* Process the command */
1656 return cmd_process(flag, child->argc, child->argv,
1657 &flag_repeat, NULL);
1658 #endif
1659 }
1660 #ifndef __U_BOOT__
1661
1662 for (i = 0; i < pi->num_progs; i++) {
1663 child = & (pi->progs[i]);
1664
1665 /* pipes are inserted between pairs of commands */
1666 if ((i + 1) < pi->num_progs) {
1667 if (pipe(pipefds)<0) perror_msg_and_die("pipe");
1668 nextout = pipefds[1];
1669 } else {
1670 nextout=1;
1671 pipefds[0] = -1;
1672 }
1673
1674 /* XXX test for failed fork()? */
1675 if (!(child->pid = fork())) {
1676 /* Set the handling for job control signals back to the default. */
1677 signal(SIGINT, SIG_DFL);
1678 signal(SIGQUIT, SIG_DFL);
1679 signal(SIGTERM, SIG_DFL);
1680 signal(SIGTSTP, SIG_DFL);
1681 signal(SIGTTIN, SIG_DFL);
1682 signal(SIGTTOU, SIG_DFL);
1683 signal(SIGCHLD, SIG_DFL);
1684
1685 close_all();
1686
1687 if (nextin != 0) {
1688 dup2(nextin, 0);
1689 close(nextin);
1690 }
1691 if (nextout != 1) {
1692 dup2(nextout, 1);
1693 close(nextout);
1694 }
1695 if (pipefds[0]!=-1) {
1696 close(pipefds[0]); /* opposite end of our output pipe */
1697 }
1698
1699 /* Like bash, explicit redirects override pipes,
1700 * and the pipe fd is available for dup'ing. */
1701 setup_redirects(child,NULL);
1702
1703 if (interactive && pi->followup!=PIPE_BG) {
1704 /* If we (the child) win the race, put ourselves in the process
1705 * group whose leader is the first process in this pipe. */
1706 if (pi->pgrp < 0) {
1707 pi->pgrp = getpid();
1708 }
1709 if (setpgid(0, pi->pgrp) == 0) {
1710 tcsetpgrp(2, pi->pgrp);
1711 }
1712 }
1713
1714 pseudo_exec(child);
1715 }
1716
1717
1718 /* put our child in the process group whose leader is the
1719 first process in this pipe */
1720 if (pi->pgrp < 0) {
1721 pi->pgrp = child->pid;
1722 }
1723 /* Don't check for errors. The child may be dead already,
1724 * in which case setpgid returns error code EACCES. */
1725 setpgid(child->pid, pi->pgrp);
1726
1727 if (nextin != 0)
1728 close(nextin);
1729 if (nextout != 1)
1730 close(nextout);
1731
1732 /* If there isn't another process, nextin is garbage
1733 but it doesn't matter */
1734 nextin = pipefds[0];
1735 }
1736 #endif
1737 return -1;
1738 }
1739
1740 static int run_list_real(struct pipe *pi)
1741 {
1742 char *save_name = NULL;
1743 char **list = NULL;
1744 char **save_list = NULL;
1745 struct pipe *rpipe;
1746 int flag_rep = 0;
1747 #ifndef __U_BOOT__
1748 int save_num_progs;
1749 #endif
1750 int rcode=0, flag_skip=1;
1751 int flag_restore = 0;
1752 int if_code=0, next_if_code=0; /* need double-buffer to handle elif */
1753 reserved_style rmode, skip_more_in_this_rmode=RES_XXXX;
1754 /* check syntax for "for" */
1755 for (rpipe = pi; rpipe; rpipe = rpipe->next) {
1756 if ((rpipe->r_mode == RES_IN ||
1757 rpipe->r_mode == RES_FOR) &&
1758 (rpipe->next == NULL)) {
1759 syntax();
1760 #ifdef __U_BOOT__
1761 flag_repeat = 0;
1762 #endif
1763 return 1;
1764 }
1765 if ((rpipe->r_mode == RES_IN &&
1766 (rpipe->next->r_mode == RES_IN &&
1767 rpipe->next->progs->argv != NULL))||
1768 (rpipe->r_mode == RES_FOR &&
1769 rpipe->next->r_mode != RES_IN)) {
1770 syntax();
1771 #ifdef __U_BOOT__
1772 flag_repeat = 0;
1773 #endif
1774 return 1;
1775 }
1776 }
1777 for (; pi; pi = (flag_restore != 0) ? rpipe : pi->next) {
1778 if (pi->r_mode == RES_WHILE || pi->r_mode == RES_UNTIL ||
1779 pi->r_mode == RES_FOR) {
1780 #ifdef __U_BOOT__
1781 /* check Ctrl-C */
1782 ctrlc();
1783 if ((had_ctrlc())) {
1784 return 1;
1785 }
1786 #endif
1787 flag_restore = 0;
1788 if (!rpipe) {
1789 flag_rep = 0;
1790 rpipe = pi;
1791 }
1792 }
1793 rmode = pi->r_mode;
1794 debug_printf("rmode=%d if_code=%d next_if_code=%d skip_more=%d\n", rmode, if_code, next_if_code, skip_more_in_this_rmode);
1795 if (rmode == skip_more_in_this_rmode && flag_skip) {
1796 if (pi->followup == PIPE_SEQ) flag_skip=0;
1797 continue;
1798 }
1799 flag_skip = 1;
1800 skip_more_in_this_rmode = RES_XXXX;
1801 if (rmode == RES_THEN || rmode == RES_ELSE) if_code = next_if_code;
1802 if (rmode == RES_THEN && if_code) continue;
1803 if (rmode == RES_ELSE && !if_code) continue;
1804 if (rmode == RES_ELIF && !if_code) break;
1805 if (rmode == RES_FOR && pi->num_progs) {
1806 if (!list) {
1807 /* if no variable values after "in" we skip "for" */
1808 if (!pi->next->progs->argv) continue;
1809 /* create list of variable values */
1810 list = make_list_in(pi->next->progs->argv,
1811 pi->progs->argv[0]);
1812 save_list = list;
1813 save_name = pi->progs->argv[0];
1814 pi->progs->argv[0] = NULL;
1815 flag_rep = 1;
1816 }
1817 if (!(*list)) {
1818 free(pi->progs->argv[0]);
1819 free(save_list);
1820 list = NULL;
1821 flag_rep = 0;
1822 pi->progs->argv[0] = save_name;
1823 #ifndef __U_BOOT__
1824 pi->progs->glob_result.gl_pathv[0] =
1825 pi->progs->argv[0];
1826 #endif
1827 continue;
1828 } else {
1829 /* insert new value from list for variable */
1830 if (pi->progs->argv[0])
1831 free(pi->progs->argv[0]);
1832 pi->progs->argv[0] = *list++;
1833 #ifndef __U_BOOT__
1834 pi->progs->glob_result.gl_pathv[0] =
1835 pi->progs->argv[0];
1836 #endif
1837 }
1838 }
1839 if (rmode == RES_IN) continue;
1840 if (rmode == RES_DO) {
1841 if (!flag_rep) continue;
1842 }
1843 if ((rmode == RES_DONE)) {
1844 if (flag_rep) {
1845 flag_restore = 1;
1846 } else {
1847 rpipe = NULL;
1848 }
1849 }
1850 if (pi->num_progs == 0) continue;
1851 #ifndef __U_BOOT__
1852 save_num_progs = pi->num_progs; /* save number of programs */
1853 #endif
1854 rcode = run_pipe_real(pi);
1855 debug_printf("run_pipe_real returned %d\n",rcode);
1856 #ifndef __U_BOOT__
1857 if (rcode!=-1) {
1858 /* We only ran a builtin: rcode was set by the return value
1859 * of run_pipe_real(), and we don't need to wait for anything. */
1860 } else if (pi->followup==PIPE_BG) {
1861 /* XXX check bash's behavior with nontrivial pipes */
1862 /* XXX compute jobid */
1863 /* XXX what does bash do with attempts to background builtins? */
1864 insert_bg_job(pi);
1865 rcode = EXIT_SUCCESS;
1866 } else {
1867 if (interactive) {
1868 /* move the new process group into the foreground */
1869 if (tcsetpgrp(shell_terminal, pi->pgrp) && errno != ENOTTY)
1870 perror_msg("tcsetpgrp-3");
1871 rcode = checkjobs(pi);
1872 /* move the shell to the foreground */
1873 if (tcsetpgrp(shell_terminal, getpgid(0)) && errno != ENOTTY)
1874 perror_msg("tcsetpgrp-4");
1875 } else {
1876 rcode = checkjobs(pi);
1877 }
1878 debug_printf("checkjobs returned %d\n",rcode);
1879 }
1880 last_return_code=rcode;
1881 #else
1882 if (rcode < -1) {
1883 last_return_code = -rcode - 2;
1884 return -2; /* exit */
1885 }
1886 last_return_code=(rcode == 0) ? 0 : 1;
1887 #endif
1888 #ifndef __U_BOOT__
1889 pi->num_progs = save_num_progs; /* restore number of programs */
1890 #endif
1891 if ( rmode == RES_IF || rmode == RES_ELIF )
1892 next_if_code=rcode; /* can be overwritten a number of times */
1893 if (rmode == RES_WHILE)
1894 flag_rep = !last_return_code;
1895 if (rmode == RES_UNTIL)
1896 flag_rep = last_return_code;
1897 if ( (rcode==EXIT_SUCCESS && pi->followup==PIPE_OR) ||
1898 (rcode!=EXIT_SUCCESS && pi->followup==PIPE_AND) )
1899 skip_more_in_this_rmode=rmode;
1900 #ifndef __U_BOOT__
1901 checkjobs(NULL);
1902 #endif
1903 }
1904 return rcode;
1905 }
1906
1907 /* broken, of course, but OK for testing */
1908 static char *indenter(int i)
1909 {
1910 static char blanks[]=" ";
1911 return &blanks[sizeof(blanks)-i-1];
1912 }
1913
1914 /* return code is the exit status of the pipe */
1915 static int free_pipe(struct pipe *pi, int indent)
1916 {
1917 char **p;
1918 struct child_prog *child;
1919 #ifndef __U_BOOT__
1920 struct redir_struct *r, *rnext;
1921 #endif
1922 int a, i, ret_code=0;
1923 char *ind = indenter(indent);
1924
1925 #ifndef __U_BOOT__
1926 if (pi->stopped_progs > 0)
1927 return ret_code;
1928 final_printf("%s run pipe: (pid %d)\n",ind,getpid());
1929 #endif
1930 for (i=0; i<pi->num_progs; i++) {
1931 child = &pi->progs[i];
1932 final_printf("%s command %d:\n",ind,i);
1933 if (child->argv) {
1934 for (a=0,p=child->argv; *p; a++,p++) {
1935 final_printf("%s argv[%d] = %s\n",ind,a,*p);
1936 }
1937 #ifndef __U_BOOT__
1938 globfree(&child->glob_result);
1939 #else
1940 for (a = 0; a < child->argc; a++) {
1941 free(child->argv[a]);
1942 }
1943 free(child->argv);
1944 child->argc = 0;
1945 #endif
1946 child->argv=NULL;
1947 } else if (child->group) {
1948 #ifndef __U_BOOT__
1949 final_printf("%s begin group (subshell:%d)\n",ind, child->subshell);
1950 #endif
1951 ret_code = free_pipe_list(child->group,indent+3);
1952 final_printf("%s end group\n",ind);
1953 } else {
1954 final_printf("%s (nil)\n",ind);
1955 }
1956 #ifndef __U_BOOT__
1957 for (r=child->redirects; r; r=rnext) {
1958 final_printf("%s redirect %d%s", ind, r->fd, redir_table[r->type].descrip);
1959 if (r->dup == -1) {
1960 /* guard against the case >$FOO, where foo is unset or blank */
1961 if (r->word.gl_pathv) {
1962 final_printf(" %s\n", *r->word.gl_pathv);
1963 globfree(&r->word);
1964 }
1965 } else {
1966 final_printf("&%d\n", r->dup);
1967 }
1968 rnext=r->next;
1969 free(r);
1970 }
1971 child->redirects=NULL;
1972 #endif
1973 }
1974 free(pi->progs); /* children are an array, they get freed all at once */
1975 pi->progs=NULL;
1976 return ret_code;
1977 }
1978
1979 static int free_pipe_list(struct pipe *head, int indent)
1980 {
1981 int rcode=0; /* if list has no members */
1982 struct pipe *pi, *next;
1983 char *ind = indenter(indent);
1984 for (pi=head; pi; pi=next) {
1985 final_printf("%s pipe reserved mode %d\n", ind, pi->r_mode);
1986 rcode = free_pipe(pi, indent);
1987 final_printf("%s pipe followup code %d\n", ind, pi->followup);
1988 next=pi->next;
1989 pi->next=NULL;
1990 free(pi);
1991 }
1992 return rcode;
1993 }
1994
1995 /* Select which version we will use */
1996 static int run_list(struct pipe *pi)
1997 {
1998 int rcode=0;
1999 #ifndef __U_BOOT__
2000 if (fake_mode==0) {
2001 #endif
2002 rcode = run_list_real(pi);
2003 #ifndef __U_BOOT__
2004 }
2005 #endif
2006 /* free_pipe_list has the side effect of clearing memory
2007 * In the long run that function can be merged with run_list_real,
2008 * but doing that now would hobble the debugging effort. */
2009 free_pipe_list(pi,0);
2010 return rcode;
2011 }
2012
2013 /* The API for glob is arguably broken. This routine pushes a non-matching
2014 * string into the output structure, removing non-backslashed backslashes.
2015 * If someone can prove me wrong, by performing this function within the
2016 * original glob(3) api, feel free to rewrite this routine into oblivion.
2017 * Return code (0 vs. GLOB_NOSPACE) matches glob(3).
2018 * XXX broken if the last character is '\\', check that before calling.
2019 */
2020 #ifndef __U_BOOT__
2021 static int globhack(const char *src, int flags, glob_t *pglob)
2022 {
2023 int cnt=0, pathc;
2024 const char *s;
2025 char *dest;
2026 for (cnt=1, s=src; s && *s; s++) {
2027 if (*s == '\\') s++;
2028 cnt++;
2029 }
2030 dest = malloc(cnt);
2031 if (!dest) return GLOB_NOSPACE;
2032 if (!(flags & GLOB_APPEND)) {
2033 pglob->gl_pathv=NULL;
2034 pglob->gl_pathc=0;
2035 pglob->gl_offs=0;
2036 pglob->gl_offs=0;
2037 }
2038 pathc = ++pglob->gl_pathc;
2039 pglob->gl_pathv = realloc(pglob->gl_pathv, (pathc+1)*sizeof(*pglob->gl_pathv));
2040 if (pglob->gl_pathv == NULL) return GLOB_NOSPACE;
2041 pglob->gl_pathv[pathc-1]=dest;
2042 pglob->gl_pathv[pathc]=NULL;
2043 for (s=src; s && *s; s++, dest++) {
2044 if (*s == '\\') s++;
2045 *dest = *s;
2046 }
2047 *dest='\0';
2048 return 0;
2049 }
2050
2051 /* XXX broken if the last character is '\\', check that before calling */
2052 static int glob_needed(const char *s)
2053 {
2054 for (; *s; s++) {
2055 if (*s == '\\') s++;
2056 if (strchr("*[?",*s)) return 1;
2057 }
2058 return 0;
2059 }
2060
2061 #if 0
2062 static void globprint(glob_t *pglob)
2063 {
2064 int i;
2065 debug_printf("glob_t at %p:\n", pglob);
2066 debug_printf(" gl_pathc=%d gl_pathv=%p gl_offs=%d gl_flags=%d\n",
2067 pglob->gl_pathc, pglob->gl_pathv, pglob->gl_offs, pglob->gl_flags);
2068 for (i=0; i<pglob->gl_pathc; i++)
2069 debug_printf("pglob->gl_pathv[%d] = %p = %s\n", i,
2070 pglob->gl_pathv[i], pglob->gl_pathv[i]);
2071 }
2072 #endif
2073
2074 static int xglob(o_string *dest, int flags, glob_t *pglob)
2075 {
2076 int gr;
2077
2078 /* short-circuit for null word */
2079 /* we can code this better when the debug_printf's are gone */
2080 if (dest->length == 0) {
2081 if (dest->nonnull) {
2082 /* bash man page calls this an "explicit" null */
2083 gr = globhack(dest->data, flags, pglob);
2084 debug_printf("globhack returned %d\n",gr);
2085 } else {
2086 return 0;
2087 }
2088 } else if (glob_needed(dest->data)) {
2089 gr = glob(dest->data, flags, NULL, pglob);
2090 debug_printf("glob returned %d\n",gr);
2091 if (gr == GLOB_NOMATCH) {
2092 /* quote removal, or more accurately, backslash removal */
2093 gr = globhack(dest->data, flags, pglob);
2094 debug_printf("globhack returned %d\n",gr);
2095 }
2096 } else {
2097 gr = globhack(dest->data, flags, pglob);
2098 debug_printf("globhack returned %d\n",gr);
2099 }
2100 if (gr == GLOB_NOSPACE)
2101 error_msg_and_die("out of memory during glob");
2102 if (gr != 0) { /* GLOB_ABORTED ? */
2103 error_msg("glob(3) error %d",gr);
2104 }
2105 /* globprint(glob_target); */
2106 return gr;
2107 }
2108 #endif
2109
2110 #ifdef __U_BOOT__
2111 static char *get_dollar_var(char ch);
2112 #endif
2113
2114 /* This is used to get/check local shell variables */
2115 char *get_local_var(const char *s)
2116 {
2117 struct variables *cur;
2118
2119 if (!s)
2120 return NULL;
2121
2122 #ifdef __U_BOOT__
2123 if (*s == '$')
2124 return get_dollar_var(s[1]);
2125 #endif
2126
2127 for (cur = top_vars; cur; cur=cur->next)
2128 if(strcmp(cur->name, s)==0)
2129 return cur->value;
2130 return NULL;
2131 }
2132
2133 /* This is used to set local shell variables
2134 flg_export==0 if only local (not exporting) variable
2135 flg_export==1 if "new" exporting environ
2136 flg_export>1 if current startup environ (not call putenv()) */
2137 int set_local_var(const char *s, int flg_export)
2138 {
2139 char *name, *value;
2140 int result=0;
2141 struct variables *cur;
2142
2143 #ifdef __U_BOOT__
2144 /* might be possible! */
2145 if (!isalpha(*s))
2146 return -1;
2147 #endif
2148
2149 name=strdup(s);
2150
2151 #ifdef __U_BOOT__
2152 if (getenv(name) != NULL) {
2153 printf ("ERROR: "
2154 "There is a global environment variable with the same name.\n");
2155 free(name);
2156 return -1;
2157 }
2158 #endif
2159 /* Assume when we enter this function that we are already in
2160 * NAME=VALUE format. So the first order of business is to
2161 * split 's' on the '=' into 'name' and 'value' */
2162 value = strchr(name, '=');
2163 if (value == NULL && ++value == NULL) {
2164 free(name);
2165 return -1;
2166 }
2167 *value++ = 0;
2168
2169 for(cur = top_vars; cur; cur = cur->next) {
2170 if(strcmp(cur->name, name)==0)
2171 break;
2172 }
2173
2174 if(cur) {
2175 if(strcmp(cur->value, value)==0) {
2176 if(flg_export>0 && cur->flg_export==0)
2177 cur->flg_export=flg_export;
2178 else
2179 result++;
2180 } else {
2181 if(cur->flg_read_only) {
2182 error_msg("%s: readonly variable", name);
2183 result = -1;
2184 } else {
2185 if(flg_export>0 || cur->flg_export>1)
2186 cur->flg_export=1;
2187 free(cur->value);
2188
2189 cur->value = strdup(value);
2190 }
2191 }
2192 } else {
2193 cur = malloc(sizeof(struct variables));
2194 if(!cur) {
2195 result = -1;
2196 } else {
2197 cur->name = strdup(name);
2198 if (cur->name == NULL) {
2199 free(cur);
2200 result = -1;
2201 } else {
2202 struct variables *bottom = top_vars;
2203 cur->value = strdup(value);
2204 cur->next = NULL;
2205 cur->flg_export = flg_export;
2206 cur->flg_read_only = 0;
2207 while(bottom->next) bottom=bottom->next;
2208 bottom->next = cur;
2209 }
2210 }
2211 }
2212
2213 #ifndef __U_BOOT__
2214 if(result==0 && cur->flg_export==1) {
2215 *(value-1) = '=';
2216 result = putenv(name);
2217 } else {
2218 #endif
2219 free(name);
2220 #ifndef __U_BOOT__
2221 if(result>0) /* equivalent to previous set */
2222 result = 0;
2223 }
2224 #endif
2225 return result;
2226 }
2227
2228 void unset_local_var(const char *name)
2229 {
2230 struct variables *cur;
2231
2232 if (name) {
2233 for (cur = top_vars; cur; cur=cur->next) {
2234 if(strcmp(cur->name, name)==0)
2235 break;
2236 }
2237 if (cur != NULL) {
2238 struct variables *next = top_vars;
2239 if(cur->flg_read_only) {
2240 error_msg("%s: readonly variable", name);
2241 return;
2242 } else {
2243 #ifndef __U_BOOT__
2244 if(cur->flg_export)
2245 unsetenv(cur->name);
2246 #endif
2247 free(cur->name);
2248 free(cur->value);
2249 while (next->next != cur)
2250 next = next->next;
2251 next->next = cur->next;
2252 }
2253 free(cur);
2254 }
2255 }
2256 }
2257
2258 static int is_assignment(const char *s)
2259 {
2260 if (s == NULL)
2261 return 0;
2262
2263 if (!isalpha(*s)) return 0;
2264 ++s;
2265 while(isalnum(*s) || *s=='_') ++s;
2266 return *s=='=';
2267 }
2268
2269 #ifndef __U_BOOT__
2270 /* the src parameter allows us to peek forward to a possible &n syntax
2271 * for file descriptor duplication, e.g., "2>&1".
2272 * Return code is 0 normally, 1 if a syntax error is detected in src.
2273 * Resource errors (in xmalloc) cause the process to exit */
2274 static int setup_redirect(struct p_context *ctx, int fd, redir_type style,
2275 struct in_str *input)
2276 {
2277 struct child_prog *child=ctx->child;
2278 struct redir_struct *redir = child->redirects;
2279 struct redir_struct *last_redir=NULL;
2280
2281 /* Create a new redir_struct and drop it onto the end of the linked list */
2282 while(redir) {
2283 last_redir=redir;
2284 redir=redir->next;
2285 }
2286 redir = xmalloc(sizeof(struct redir_struct));
2287 redir->next=NULL;
2288 redir->word.gl_pathv=NULL;
2289 if (last_redir) {
2290 last_redir->next=redir;
2291 } else {
2292 child->redirects=redir;
2293 }
2294
2295 redir->type=style;
2296 redir->fd= (fd==-1) ? redir_table[style].default_fd : fd ;
2297
2298 debug_printf("Redirect type %d%s\n", redir->fd, redir_table[style].descrip);
2299
2300 /* Check for a '2>&1' type redirect */
2301 redir->dup = redirect_dup_num(input);
2302 if (redir->dup == -2) return 1; /* syntax error */
2303 if (redir->dup != -1) {
2304 /* Erik had a check here that the file descriptor in question
2305 * is legit; I postpone that to "run time"
2306 * A "-" representation of "close me" shows up as a -3 here */
2307 debug_printf("Duplicating redirect '%d>&%d'\n", redir->fd, redir->dup);
2308 } else {
2309 /* We do _not_ try to open the file that src points to,
2310 * since we need to return and let src be expanded first.
2311 * Set ctx->pending_redirect, so we know what to do at the
2312 * end of the next parsed word.
2313 */
2314 ctx->pending_redirect = redir;
2315 }
2316 return 0;
2317 }
2318 #endif
2319
2320 static struct pipe *new_pipe(void)
2321 {
2322 struct pipe *pi;
2323 pi = xmalloc(sizeof(struct pipe));
2324 pi->num_progs = 0;
2325 pi->progs = NULL;
2326 pi->next = NULL;
2327 pi->followup = 0; /* invalid */
2328 pi->r_mode = RES_NONE;
2329 return pi;
2330 }
2331
2332 static void initialize_context(struct p_context *ctx)
2333 {
2334 ctx->pipe=NULL;
2335 #ifndef __U_BOOT__
2336 ctx->pending_redirect=NULL;
2337 #endif
2338 ctx->child=NULL;
2339 ctx->list_head=new_pipe();
2340 ctx->pipe=ctx->list_head;
2341 ctx->w=RES_NONE;
2342 ctx->stack=NULL;
2343 #ifdef __U_BOOT__
2344 ctx->old_flag=0;
2345 #endif
2346 done_command(ctx); /* creates the memory for working child */
2347 }
2348
2349 /* normal return is 0
2350 * if a reserved word is found, and processed, return 1
2351 * should handle if, then, elif, else, fi, for, while, until, do, done.
2352 * case, function, and select are obnoxious, save those for later.
2353 */
2354 struct reserved_combo {
2355 char *literal;
2356 int code;
2357 long flag;
2358 };
2359 /* Mostly a list of accepted follow-up reserved words.
2360 * FLAG_END means we are done with the sequence, and are ready
2361 * to turn the compound list into a command.
2362 * FLAG_START means the word must start a new compound list.
2363 */
2364 static struct reserved_combo reserved_list[] = {
2365 { "if", RES_IF, FLAG_THEN | FLAG_START },
2366 { "then", RES_THEN, FLAG_ELIF | FLAG_ELSE | FLAG_FI },
2367 { "elif", RES_ELIF, FLAG_THEN },
2368 { "else", RES_ELSE, FLAG_FI },
2369 { "fi", RES_FI, FLAG_END },
2370 { "for", RES_FOR, FLAG_IN | FLAG_START },
2371 { "while", RES_WHILE, FLAG_DO | FLAG_START },
2372 { "until", RES_UNTIL, FLAG_DO | FLAG_START },
2373 { "in", RES_IN, FLAG_DO },
2374 { "do", RES_DO, FLAG_DONE },
2375 { "done", RES_DONE, FLAG_END }
2376 };
2377 #define NRES (sizeof(reserved_list)/sizeof(struct reserved_combo))
2378
2379 static int reserved_word(o_string *dest, struct p_context *ctx)
2380 {
2381 struct reserved_combo *r;
2382 for (r=reserved_list;
2383 r<reserved_list+NRES; r++) {
2384 if (strcmp(dest->data, r->literal) == 0) {
2385 debug_printf("found reserved word %s, code %d\n",r->literal,r->code);
2386 if (r->flag & FLAG_START) {
2387 struct p_context *new = xmalloc(sizeof(struct p_context));
2388 debug_printf("push stack\n");
2389 if (ctx->w == RES_IN || ctx->w == RES_FOR) {
2390 syntax();
2391 free(new);
2392 ctx->w = RES_SNTX;
2393 b_reset(dest);
2394 return 1;
2395 }
2396 *new = *ctx; /* physical copy */
2397 initialize_context(ctx);
2398 ctx->stack=new;
2399 } else if ( ctx->w == RES_NONE || ! (ctx->old_flag & (1<<r->code))) {
2400 syntax();
2401 ctx->w = RES_SNTX;
2402 b_reset(dest);
2403 return 1;
2404 }
2405 ctx->w=r->code;
2406 ctx->old_flag = r->flag;
2407 if (ctx->old_flag & FLAG_END) {
2408 struct p_context *old;
2409 debug_printf("pop stack\n");
2410 done_pipe(ctx,PIPE_SEQ);
2411 old = ctx->stack;
2412 old->child->group = ctx->list_head;
2413 #ifndef __U_BOOT__
2414 old->child->subshell = 0;
2415 #endif
2416 *ctx = *old; /* physical copy */
2417 free(old);
2418 }
2419 b_reset (dest);
2420 return 1;
2421 }
2422 }
2423 return 0;
2424 }
2425
2426 /* normal return is 0.
2427 * Syntax or xglob errors return 1. */
2428 static int done_word(o_string *dest, struct p_context *ctx)
2429 {
2430 struct child_prog *child=ctx->child;
2431 #ifndef __U_BOOT__
2432 glob_t *glob_target;
2433 int gr, flags = 0;
2434 #else
2435 char *str, *s;
2436 int argc, cnt;
2437 #endif
2438
2439 debug_printf("done_word: %s %p\n", dest->data, child);
2440 if (dest->length == 0 && !dest->nonnull) {
2441 debug_printf(" true null, ignored\n");
2442 return 0;
2443 }
2444 #ifndef __U_BOOT__
2445 if (ctx->pending_redirect) {
2446 glob_target = &ctx->pending_redirect->word;
2447 } else {
2448 #endif
2449 if (child->group) {
2450 syntax();
2451 return 1; /* syntax error, groups and arglists don't mix */
2452 }
2453 if (!child->argv && (ctx->type & FLAG_PARSE_SEMICOLON)) {
2454 debug_printf("checking %s for reserved-ness\n",dest->data);
2455 if (reserved_word(dest,ctx)) return ctx->w==RES_SNTX;
2456 }
2457 #ifndef __U_BOOT__
2458 glob_target = &child->glob_result;
2459 if (child->argv) flags |= GLOB_APPEND;
2460 #else
2461 for (cnt = 1, s = dest->data; s && *s; s++) {
2462 if (*s == '\\') s++;
2463 cnt++;
2464 }
2465 str = malloc(cnt);
2466 if (!str) return 1;
2467 if ( child->argv == NULL) {
2468 child->argc=0;
2469 }
2470 argc = ++child->argc;
2471 child->argv = realloc(child->argv, (argc+1)*sizeof(*child->argv));
2472 if (child->argv == NULL) return 1;
2473 child->argv[argc-1]=str;
2474 child->argv[argc]=NULL;
2475 for (s = dest->data; s && *s; s++,str++) {
2476 if (*s == '\\') s++;
2477 *str = *s;
2478 }
2479 *str = '\0';
2480 #endif
2481 #ifndef __U_BOOT__
2482 }
2483 gr = xglob(dest, flags, glob_target);
2484 if (gr != 0) return 1;
2485 #endif
2486
2487 b_reset(dest);
2488 #ifndef __U_BOOT__
2489 if (ctx->pending_redirect) {
2490 ctx->pending_redirect=NULL;
2491 if (glob_target->gl_pathc != 1) {
2492 error_msg("ambiguous redirect");
2493 return 1;
2494 }
2495 } else {
2496 child->argv = glob_target->gl_pathv;
2497 }
2498 #endif
2499 if (ctx->w == RES_FOR) {
2500 done_word(dest,ctx);
2501 done_pipe(ctx,PIPE_SEQ);
2502 }
2503 return 0;
2504 }
2505
2506 /* The only possible error here is out of memory, in which case
2507 * xmalloc exits. */
2508 static int done_command(struct p_context *ctx)
2509 {
2510 /* The child is really already in the pipe structure, so
2511 * advance the pipe counter and make a new, null child.
2512 * Only real trickiness here is that the uncommitted
2513 * child structure, to which ctx->child points, is not
2514 * counted in pi->num_progs. */
2515 struct pipe *pi=ctx->pipe;
2516 struct child_prog *prog=ctx->child;
2517
2518 if (prog && prog->group == NULL
2519 && prog->argv == NULL
2520 #ifndef __U_BOOT__
2521 && prog->redirects == NULL) {
2522 #else
2523 ) {
2524 #endif
2525 debug_printf("done_command: skipping null command\n");
2526 return 0;
2527 } else if (prog) {
2528 pi->num_progs++;
2529 debug_printf("done_command: num_progs incremented to %d\n",pi->num_progs);
2530 } else {
2531 debug_printf("done_command: initializing\n");
2532 }
2533 pi->progs = xrealloc(pi->progs, sizeof(*pi->progs) * (pi->num_progs+1));
2534
2535 prog = pi->progs + pi->num_progs;
2536 #ifndef __U_BOOT__
2537 prog->redirects = NULL;
2538 #endif
2539 prog->argv = NULL;
2540 #ifndef __U_BOOT__
2541 prog->is_stopped = 0;
2542 #endif
2543 prog->group = NULL;
2544 #ifndef __U_BOOT__
2545 prog->glob_result.gl_pathv = NULL;
2546 prog->family = pi;
2547 #endif
2548 prog->sp = 0;
2549 ctx->child = prog;
2550 prog->type = ctx->type;
2551
2552 /* but ctx->pipe and ctx->list_head remain unchanged */
2553 return 0;
2554 }
2555
2556 static int done_pipe(struct p_context *ctx, pipe_style type)
2557 {
2558 struct pipe *new_p;
2559 done_command(ctx); /* implicit closure of previous command */
2560 debug_printf("done_pipe, type %d\n", type);
2561 ctx->pipe->followup = type;
2562 ctx->pipe->r_mode = ctx->w;
2563 new_p=new_pipe();
2564 ctx->pipe->next = new_p;
2565 ctx->pipe = new_p;
2566 ctx->child = NULL;
2567 done_command(ctx); /* set up new pipe to accept commands */
2568 return 0;
2569 }
2570
2571 #ifndef __U_BOOT__
2572 /* peek ahead in the in_str to find out if we have a "&n" construct,
2573 * as in "2>&1", that represents duplicating a file descriptor.
2574 * returns either -2 (syntax error), -1 (no &), or the number found.
2575 */
2576 static int redirect_dup_num(struct in_str *input)
2577 {
2578 int ch, d=0, ok=0;
2579 ch = b_peek(input);
2580 if (ch != '&') return -1;
2581
2582 b_getch(input); /* get the & */
2583 ch=b_peek(input);
2584 if (ch == '-') {
2585 b_getch(input);
2586 return -3; /* "-" represents "close me" */
2587 }
2588 while (isdigit(ch)) {
2589 d = d*10+(ch-'0');
2590 ok=1;
2591 b_getch(input);
2592 ch = b_peek(input);
2593 }
2594 if (ok) return d;
2595
2596 error_msg("ambiguous redirect");
2597 return -2;
2598 }
2599
2600 /* If a redirect is immediately preceded by a number, that number is
2601 * supposed to tell which file descriptor to redirect. This routine
2602 * looks for such preceding numbers. In an ideal world this routine
2603 * needs to handle all the following classes of redirects...
2604 * echo 2>foo # redirects fd 2 to file "foo", nothing passed to echo
2605 * echo 49>foo # redirects fd 49 to file "foo", nothing passed to echo
2606 * echo -2>foo # redirects fd 1 to file "foo", "-2" passed to echo
2607 * echo 49x>foo # redirects fd 1 to file "foo", "49x" passed to echo
2608 * A -1 output from this program means no valid number was found, so the
2609 * caller should use the appropriate default for this redirection.
2610 */
2611 static int redirect_opt_num(o_string *o)
2612 {
2613 int num;
2614
2615 if (o->length==0) return -1;
2616 for(num=0; num<o->length; num++) {
2617 if (!isdigit(*(o->data+num))) {
2618 return -1;
2619 }
2620 }
2621 /* reuse num (and save an int) */
2622 num=atoi(o->data);
2623 b_reset(o);
2624 return num;
2625 }
2626
2627 FILE *generate_stream_from_list(struct pipe *head)
2628 {
2629 FILE *pf;
2630 #if 1
2631 int pid, channel[2];
2632 if (pipe(channel)<0) perror_msg_and_die("pipe");
2633 pid=fork();
2634 if (pid<0) {
2635 perror_msg_and_die("fork");
2636 } else if (pid==0) {
2637 close(channel[0]);
2638 if (channel[1] != 1) {
2639 dup2(channel[1],1);
2640 close(channel[1]);
2641 }
2642 #if 0
2643 #define SURROGATE "surrogate response"
2644 write(1,SURROGATE,sizeof(SURROGATE));
2645 _exit(run_list(head));
2646 #else
2647 _exit(run_list_real(head)); /* leaks memory */
2648 #endif
2649 }
2650 debug_printf("forked child %d\n",pid);
2651 close(channel[1]);
2652 pf = fdopen(channel[0],"r");
2653 debug_printf("pipe on FILE *%p\n",pf);
2654 #else
2655 free_pipe_list(head,0);
2656 pf=popen("echo surrogate response","r");
2657 debug_printf("started fake pipe on FILE *%p\n",pf);
2658 #endif
2659 return pf;
2660 }
2661
2662 /* this version hacked for testing purposes */
2663 /* return code is exit status of the process that is run. */
2664 static int process_command_subs(o_string *dest, struct p_context *ctx, struct in_str *input, int subst_end)
2665 {
2666 int retcode;
2667 o_string result=NULL_O_STRING;
2668 struct p_context inner;
2669 FILE *p;
2670 struct in_str pipe_str;
2671 initialize_context(&inner);
2672
2673 /* recursion to generate command */
2674 retcode = parse_stream(&result, &inner, input, subst_end);
2675 if (retcode != 0) return retcode; /* syntax error or EOF */
2676 done_word(&result, &inner);
2677 done_pipe(&inner, PIPE_SEQ);
2678 b_free(&result);
2679
2680 p=generate_stream_from_list(inner.list_head);
2681 if (p==NULL) return 1;
2682 mark_open(fileno(p));
2683 setup_file_in_str(&pipe_str, p);
2684
2685 /* now send results of command back into original context */
2686 retcode = parse_stream(dest, ctx, &pipe_str, '\0');
2687 /* XXX In case of a syntax error, should we try to kill the child?
2688 * That would be tough to do right, so just read until EOF. */
2689 if (retcode == 1) {
2690 while (b_getch(&pipe_str)!=EOF) { /* discard */ };
2691 }
2692
2693 debug_printf("done reading from pipe, pclose()ing\n");
2694 /* This is the step that wait()s for the child. Should be pretty
2695 * safe, since we just read an EOF from its stdout. We could try
2696 * to better, by using wait(), and keeping track of background jobs
2697 * at the same time. That would be a lot of work, and contrary
2698 * to the KISS philosophy of this program. */
2699 mark_closed(fileno(p));
2700 retcode=pclose(p);
2701 free_pipe_list(inner.list_head,0);
2702 debug_printf("pclosed, retcode=%d\n",retcode);
2703 /* XXX this process fails to trim a single trailing newline */
2704 return retcode;
2705 }
2706
2707 static int parse_group(o_string *dest, struct p_context *ctx,
2708 struct in_str *input, int ch)
2709 {
2710 int rcode, endch=0;
2711 struct p_context sub;
2712 struct child_prog *child = ctx->child;
2713 if (child->argv) {
2714 syntax();
2715 return 1; /* syntax error, groups and arglists don't mix */
2716 }
2717 initialize_context(&sub);
2718 switch(ch) {
2719 case '(': endch=')'; child->subshell=1; break;
2720 case '{': endch='}'; break;
2721 default: syntax(); /* really logic error */
2722 }
2723 rcode=parse_stream(dest,&sub,input,endch);
2724 done_word(dest,&sub); /* finish off the final word in the subcontext */
2725 done_pipe(&sub, PIPE_SEQ); /* and the final command there, too */
2726 child->group = sub.list_head;
2727 return rcode;
2728 /* child remains "open", available for possible redirects */
2729 }
2730 #endif
2731
2732 /* basically useful version until someone wants to get fancier,
2733 * see the bash man page under "Parameter Expansion" */
2734 static char *lookup_param(char *src)
2735 {
2736 char *p;
2737 char *sep;
2738 char *default_val = NULL;
2739 int assign = 0;
2740 int expand_empty = 0;
2741
2742 if (!src)
2743 return NULL;
2744
2745 sep = strchr(src, ':');
2746
2747 if (sep) {
2748 *sep = '\0';
2749 if (*(sep + 1) == '-')
2750 default_val = sep+2;
2751 if (*(sep + 1) == '=') {
2752 default_val = sep+2;
2753 assign = 1;
2754 }
2755 if (*(sep + 1) == '+') {
2756 default_val = sep+2;
2757 expand_empty = 1;
2758 }
2759 }
2760
2761 p = getenv(src);
2762 if (!p)
2763 p = get_local_var(src);
2764
2765 if (!p || strlen(p) == 0) {
2766 p = default_val;
2767 if (assign) {
2768 char *var = malloc(strlen(src)+strlen(default_val)+2);
2769 if (var) {
2770 sprintf(var, "%s=%s", src, default_val);
2771 set_local_var(var, 0);
2772 }
2773 free(var);
2774 }
2775 } else if (expand_empty) {
2776 p += strlen(p);
2777 }
2778
2779 if (sep)
2780 *sep = ':';
2781
2782 return p;
2783 }
2784
2785 #ifdef __U_BOOT__
2786 static char *get_dollar_var(char ch)
2787 {
2788 static char buf[40];
2789
2790 buf[0] = '\0';
2791 switch (ch) {
2792 case '?':
2793 sprintf(buf, "%u", (unsigned int)last_return_code);
2794 break;
2795 default:
2796 return NULL;
2797 }
2798 return buf;
2799 }
2800 #endif
2801
2802 /* return code: 0 for OK, 1 for syntax error */
2803 static int handle_dollar(o_string *dest, struct p_context *ctx, struct in_str *input)
2804 {
2805 #ifndef __U_BOOT__
2806 int i, advance=0;
2807 #else
2808 int advance=0;
2809 #endif
2810 #ifndef __U_BOOT__
2811 char sep[]=" ";
2812 #endif
2813 int ch = input->peek(input); /* first character after the $ */
2814 debug_printf("handle_dollar: ch=%c\n",ch);
2815 if (isalpha(ch)) {
2816 b_addchr(dest, SPECIAL_VAR_SYMBOL);
2817 ctx->child->sp++;
2818 while(ch=b_peek(input),isalnum(ch) || ch=='_') {
2819 b_getch(input);
2820 b_addchr(dest,ch);
2821 }
2822 b_addchr(dest, SPECIAL_VAR_SYMBOL);
2823 #ifndef __U_BOOT__
2824 } else if (isdigit(ch)) {
2825 i = ch-'0'; /* XXX is $0 special? */
2826 if (i<global_argc) {
2827 parse_string(dest, ctx, global_argv[i]); /* recursion */
2828 }
2829 advance = 1;
2830 #endif
2831 } else switch (ch) {
2832 #ifndef __U_BOOT__
2833 case '$':
2834 b_adduint(dest,getpid());
2835 advance = 1;
2836 break;
2837 case '!':
2838 if (last_bg_pid > 0) b_adduint(dest, last_bg_pid);
2839 advance = 1;
2840 break;
2841 #endif
2842 case '?':
2843 #ifndef __U_BOOT__
2844 b_adduint(dest,last_return_code);
2845 #else
2846 ctx->child->sp++;
2847 b_addchr(dest, SPECIAL_VAR_SYMBOL);
2848 b_addchr(dest, '$');
2849 b_addchr(dest, '?');
2850 b_addchr(dest, SPECIAL_VAR_SYMBOL);
2851 #endif
2852 advance = 1;
2853 break;
2854 #ifndef __U_BOOT__
2855 case '#':
2856 b_adduint(dest,global_argc ? global_argc-1 : 0);
2857 advance = 1;
2858 break;
2859 #endif
2860 case '{':
2861 b_addchr(dest, SPECIAL_VAR_SYMBOL);
2862 ctx->child->sp++;
2863 b_getch(input);
2864 /* XXX maybe someone will try to escape the '}' */
2865 while(ch=b_getch(input),ch!=EOF && ch!='}') {
2866 b_addchr(dest,ch);
2867 }
2868 if (ch != '}') {
2869 syntax();
2870 return 1;
2871 }
2872 b_addchr(dest, SPECIAL_VAR_SYMBOL);
2873 break;
2874 #ifndef __U_BOOT__
2875 case '(':
2876 b_getch(input);
2877 process_command_subs(dest, ctx, input, ')');
2878 break;
2879 case '*':
2880 sep[0]=ifs[0];
2881 for (i=1; i<global_argc; i++) {
2882 parse_string(dest, ctx, global_argv[i]);
2883 if (i+1 < global_argc) parse_string(dest, ctx, sep);
2884 }
2885 break;
2886 case '@':
2887 case '-':
2888 case '_':
2889 /* still unhandled, but should be eventually */
2890 error_msg("unhandled syntax: $%c",ch);
2891 return 1;
2892 break;
2893 #endif
2894 default:
2895 b_addqchr(dest,'$',dest->quote);
2896 }
2897 /* Eat the character if the flag was set. If the compiler
2898 * is smart enough, we could substitute "b_getch(input);"
2899 * for all the "advance = 1;" above, and also end up with
2900 * a nice size-optimized program. Hah! That'll be the day.
2901 */
2902 if (advance) b_getch(input);
2903 return 0;
2904 }
2905
2906 #ifndef __U_BOOT__
2907 int parse_string(o_string *dest, struct p_context *ctx, const char *src)
2908 {
2909 struct in_str foo;
2910 setup_string_in_str(&foo, src);
2911 return parse_stream(dest, ctx, &foo, '\0');
2912 }
2913 #endif
2914
2915 /* return code is 0 for normal exit, 1 for syntax error */
2916 static int parse_stream(o_string *dest, struct p_context *ctx,
2917 struct in_str *input, int end_trigger)
2918 {
2919 unsigned int ch, m;
2920 #ifndef __U_BOOT__
2921 int redir_fd;
2922 redir_type redir_style;
2923 #endif
2924 int next;
2925
2926 /* Only double-quote state is handled in the state variable dest->quote.
2927 * A single-quote triggers a bypass of the main loop until its mate is
2928 * found. When recursing, quote state is passed in via dest->quote. */
2929
2930 debug_printf("parse_stream, end_trigger=%d\n",end_trigger);
2931 while ((ch=b_getch(input))!=EOF) {
2932 m = map[ch];
2933 #ifdef __U_BOOT__
2934 if (input->__promptme == 0) return 1;
2935 #endif
2936 next = (ch == '\n') ? 0 : b_peek(input);
2937
2938 debug_printf("parse_stream: ch=%c (%d) m=%d quote=%d - %c\n",
2939 ch >= ' ' ? ch : '.', ch, m,
2940 dest->quote, ctx->stack == NULL ? '*' : '.');
2941
2942 if (m==0 || ((m==1 || m==2) && dest->quote)) {
2943 b_addqchr(dest, ch, dest->quote);
2944 } else {
2945 if (m==2) { /* unquoted IFS */
2946 if (done_word(dest, ctx)) {
2947 return 1;
2948 }
2949 /* If we aren't performing a substitution, treat a newline as a
2950 * command separator. */
2951 if (end_trigger != '\0' && ch=='\n')
2952 done_pipe(ctx,PIPE_SEQ);
2953 }
2954 if (ch == end_trigger && !dest->quote && ctx->w==RES_NONE) {
2955 debug_printf("leaving parse_stream (triggered)\n");
2956 return 0;
2957 }
2958 #if 0
2959 if (ch=='\n') {
2960 /* Yahoo! Time to run with it! */
2961 done_pipe(ctx,PIPE_SEQ);
2962 run_list(ctx->list_head);
2963 initialize_context(ctx);
2964 }
2965 #endif
2966 if (m!=2) switch (ch) {
2967 case '#':
2968 if (dest->length == 0 && !dest->quote) {
2969 while(ch=b_peek(input),ch!=EOF && ch!='\n') { b_getch(input); }
2970 } else {
2971 b_addqchr(dest, ch, dest->quote);
2972 }
2973 break;
2974 case '\\':
2975 if (next == EOF) {
2976 syntax();
2977 return 1;
2978 }
2979 b_addqchr(dest, '\\', dest->quote);
2980 b_addqchr(dest, b_getch(input), dest->quote);
2981 break;
2982 case '$':
2983 if (handle_dollar(dest, ctx, input)!=0) return 1;
2984 break;
2985 case '\'':
2986 dest->nonnull = 1;
2987 while(ch=b_getch(input),ch!=EOF && ch!='\'') {
2988 #ifdef __U_BOOT__
2989 if(input->__promptme == 0) return 1;
2990 #endif
2991 b_addchr(dest,ch);
2992 }
2993 if (ch==EOF) {
2994 syntax();
2995 return 1;
2996 }
2997 break;
2998 case '"':
2999 dest->nonnull = 1;
3000 dest->quote = !dest->quote;
3001 break;
3002 #ifndef __U_BOOT__
3003 case '`':
3004 process_command_subs(dest, ctx, input, '`');
3005 break;
3006 case '>':
3007 redir_fd = redirect_opt_num(dest);
3008 done_word(dest, ctx);
3009 redir_style=REDIRECT_OVERWRITE;
3010 if (next == '>') {
3011 redir_style=REDIRECT_APPEND;
3012 b_getch(input);
3013 } else if (next == '(') {
3014 syntax(); /* until we support >(list) Process Substitution */
3015 return 1;
3016 }
3017 setup_redirect(ctx, redir_fd, redir_style, input);
3018 break;
3019 case '<':
3020 redir_fd = redirect_opt_num(dest);
3021 done_word(dest, ctx);
3022 redir_style=REDIRECT_INPUT;
3023 if (next == '<') {
3024 redir_style=REDIRECT_HEREIS;
3025 b_getch(input);
3026 } else if (next == '>') {
3027 redir_style=REDIRECT_IO;
3028 b_getch(input);
3029 } else if (next == '(') {
3030 syntax(); /* until we support <(list) Process Substitution */
3031 return 1;
3032 }
3033 setup_redirect(ctx, redir_fd, redir_style, input);
3034 break;
3035 #endif
3036 case ';':
3037 done_word(dest, ctx);
3038 done_pipe(ctx,PIPE_SEQ);
3039 break;
3040 case '&':
3041 done_word(dest, ctx);
3042 if (next=='&') {
3043 b_getch(input);
3044 done_pipe(ctx,PIPE_AND);
3045 } else {
3046 #ifndef __U_BOOT__
3047 done_pipe(ctx,PIPE_BG);
3048 #else
3049 syntax_err();
3050 return 1;
3051 #endif
3052 }
3053 break;
3054 case '|':
3055 done_word(dest, ctx);
3056 if (next=='|') {
3057 b_getch(input);
3058 done_pipe(ctx,PIPE_OR);
3059 } else {
3060 /* we could pick up a file descriptor choice here
3061 * with redirect_opt_num(), but bash doesn't do it.
3062 * "echo foo 2| cat" yields "foo 2". */
3063 #ifndef __U_BOOT__
3064 done_command(ctx);
3065 #else
3066 syntax_err();
3067 return 1;
3068 #endif
3069 }
3070 break;
3071 #ifndef __U_BOOT__
3072 case '(':
3073 case '{':
3074 if (parse_group(dest, ctx, input, ch)!=0) return 1;
3075 break;
3076 case ')':
3077 case '}':
3078 syntax(); /* Proper use of this character caught by end_trigger */
3079 return 1;
3080 break;
3081 #endif
3082 case SUBSTED_VAR_SYMBOL:
3083 dest->nonnull = 1;
3084 while (ch = b_getch(input), ch != EOF &&
3085 ch != SUBSTED_VAR_SYMBOL) {
3086 debug_printf("subst, pass=%d\n", ch);
3087 if (input->__promptme == 0)
3088 return 1;
3089 b_addchr(dest, ch);
3090 }
3091 debug_printf("subst, term=%d\n", ch);
3092 if (ch == EOF) {
3093 syntax();
3094 return 1;
3095 }
3096 break;
3097 default:
3098 syntax(); /* this is really an internal logic error */
3099 return 1;
3100 }
3101 }
3102 }
3103 /* complain if quote? No, maybe we just finished a command substitution
3104 * that was quoted. Example:
3105 * $ echo "`cat foo` plus more"
3106 * and we just got the EOF generated by the subshell that ran "cat foo"
3107 * The only real complaint is if we got an EOF when end_trigger != '\0',
3108 * that is, we were really supposed to get end_trigger, and never got
3109 * one before the EOF. Can't use the standard "syntax error" return code,
3110 * so that parse_stream_outer can distinguish the EOF and exit smoothly. */
3111 debug_printf("leaving parse_stream (EOF)\n");
3112 if (end_trigger != '\0') return -1;
3113 return 0;
3114 }
3115
3116 static void mapset(const unsigned char *set, int code)
3117 {
3118 const unsigned char *s;
3119 for (s=set; *s; s++) map[*s] = code;
3120 }
3121
3122 static void update_ifs_map(void)
3123 {
3124 /* char *ifs and char map[256] are both globals. */
3125 ifs = (uchar *)getenv("IFS");
3126 if (ifs == NULL) ifs=(uchar *)" \t\n";
3127 /* Precompute a list of 'flow through' behavior so it can be treated
3128 * quickly up front. Computation is necessary because of IFS.
3129 * Special case handling of IFS == " \t\n" is not implemented.
3130 * The map[] array only really needs two bits each, and on most machines
3131 * that would be faster because of the reduced L1 cache footprint.
3132 */
3133 memset(map,0,sizeof(map)); /* most characters flow through always */
3134 #ifndef __U_BOOT__
3135 mapset((uchar *)"\\$'\"`", 3); /* never flow through */
3136 mapset((uchar *)"<>;&|(){}#", 1); /* flow through if quoted */
3137 #else
3138 {
3139 uchar subst[2] = {SUBSTED_VAR_SYMBOL, 0};
3140 mapset(subst, 3); /* never flow through */
3141 }
3142 mapset((uchar *)"\\$'\"", 3); /* never flow through */
3143 mapset((uchar *)";&|#", 1); /* flow through if quoted */
3144 #endif
3145 mapset(ifs, 2); /* also flow through if quoted */
3146 }
3147
3148 /* most recursion does not come through here, the exeception is
3149 * from builtin_source() */
3150 static int parse_stream_outer(struct in_str *inp, int flag)
3151 {
3152
3153 struct p_context ctx;
3154 o_string temp=NULL_O_STRING;
3155 int rcode;
3156 #ifdef __U_BOOT__
3157 int code = 0;
3158 #endif
3159 do {
3160 ctx.type = flag;
3161 initialize_context(&ctx);
3162 update_ifs_map();
3163 if (!(flag & FLAG_PARSE_SEMICOLON) || (flag & FLAG_REPARSING)) mapset((uchar *)";$&|", 0);
3164 inp->promptmode=1;
3165 rcode = parse_stream(&temp, &ctx, inp, '\n');
3166 #ifdef __U_BOOT__
3167 if (rcode == 1) flag_repeat = 0;
3168 #endif
3169 if (rcode != 1 && ctx.old_flag != 0) {
3170 syntax();
3171 #ifdef __U_BOOT__
3172 flag_repeat = 0;
3173 #endif
3174 }
3175 if (rcode != 1 && ctx.old_flag == 0) {
3176 done_word(&temp, &ctx);
3177 done_pipe(&ctx,PIPE_SEQ);
3178 #ifndef __U_BOOT__
3179 run_list(ctx.list_head);
3180 #else
3181 code = run_list(ctx.list_head);
3182 if (code == -2) { /* exit */
3183 b_free(&temp);
3184 code = 0;
3185 /* XXX hackish way to not allow exit from main loop */
3186 if (inp->peek == file_peek) {
3187 printf("exit not allowed from main input shell.\n");
3188 continue;
3189 }
3190 break;
3191 }
3192 if (code == -1)
3193 flag_repeat = 0;
3194 #endif
3195 } else {
3196 if (ctx.old_flag != 0) {
3197 free(ctx.stack);
3198 b_reset(&temp);
3199 }
3200 #ifdef __U_BOOT__
3201 if (inp->__promptme == 0) printf("<INTERRUPT>\n");
3202 inp->__promptme = 1;
3203 #endif
3204 temp.nonnull = 0;
3205 temp.quote = 0;
3206 inp->p = NULL;
3207 free_pipe_list(ctx.list_head,0);
3208 }
3209 b_free(&temp);
3210 } while (rcode != -1 && !(flag & FLAG_EXIT_FROM_LOOP)); /* loop on syntax errors, return on EOF */
3211 #ifndef __U_BOOT__
3212 return 0;
3213 #else
3214 return (code != 0) ? 1 : 0;
3215 #endif /* __U_BOOT__ */
3216 }
3217
3218 #ifndef __U_BOOT__
3219 static int parse_string_outer(const char *s, int flag)
3220 #else
3221 int parse_string_outer(const char *s, int flag)
3222 #endif /* __U_BOOT__ */
3223 {
3224 struct in_str input;
3225 #ifdef __U_BOOT__
3226 char *p = NULL;
3227 int rcode;
3228 if ( !s || !*s)
3229 return 1;
3230 if (!(p = strchr(s, '\n')) || *++p) {
3231 p = xmalloc(strlen(s) + 2);
3232 strcpy(p, s);
3233 strcat(p, "\n");
3234 setup_string_in_str(&input, p);
3235 rcode = parse_stream_outer(&input, flag);
3236 free(p);
3237 return rcode;
3238 } else {
3239 #endif
3240 setup_string_in_str(&input, s);
3241 return parse_stream_outer(&input, flag);
3242 #ifdef __U_BOOT__
3243 }
3244 #endif
3245 }
3246
3247 #ifndef __U_BOOT__
3248 static int parse_file_outer(FILE *f)
3249 #else
3250 int parse_file_outer(void)
3251 #endif
3252 {
3253 int rcode;
3254 struct in_str input;
3255 #ifndef __U_BOOT__
3256 setup_file_in_str(&input, f);
3257 #else
3258 setup_file_in_str(&input);
3259 #endif
3260 rcode = parse_stream_outer(&input, FLAG_PARSE_SEMICOLON);
3261 return rcode;
3262 }
3263
3264 #ifdef __U_BOOT__
3265 #ifdef CONFIG_NEEDS_MANUAL_RELOC
3266 static void u_boot_hush_reloc(void)
3267 {
3268 unsigned long addr;
3269 struct reserved_combo *r;
3270
3271 for (r=reserved_list; r<reserved_list+NRES; r++) {
3272 addr = (ulong) (r->literal) + gd->reloc_off;
3273 r->literal = (char *)addr;
3274 }
3275 }
3276 #endif
3277
3278 int u_boot_hush_start(void)
3279 {
3280 if (top_vars == NULL) {
3281 top_vars = malloc(sizeof(struct variables));
3282 top_vars->name = "HUSH_VERSION";
3283 top_vars->value = "0.01";
3284 top_vars->next = NULL;
3285 top_vars->flg_export = 0;
3286 top_vars->flg_read_only = 1;
3287 #ifdef CONFIG_NEEDS_MANUAL_RELOC
3288 u_boot_hush_reloc();
3289 #endif
3290 }
3291 return 0;
3292 }
3293
3294 static void *xmalloc(size_t size)
3295 {
3296 void *p = NULL;
3297
3298 if (!(p = malloc(size))) {
3299 printf("ERROR : memory not allocated\n");
3300 for(;;);
3301 }
3302 return p;
3303 }
3304
3305 static void *xrealloc(void *ptr, size_t size)
3306 {
3307 void *p = NULL;
3308
3309 if (!(p = realloc(ptr, size))) {
3310 printf("ERROR : memory not allocated\n");
3311 for(;;);
3312 }
3313 return p;
3314 }
3315 #endif /* __U_BOOT__ */
3316
3317 #ifndef __U_BOOT__
3318 /* Make sure we have a controlling tty. If we get started under a job
3319 * aware app (like bash for example), make sure we are now in charge so
3320 * we don't fight over who gets the foreground */
3321 static void setup_job_control(void)
3322 {
3323 static pid_t shell_pgrp;
3324 /* Loop until we are in the foreground. */
3325 while (tcgetpgrp (shell_terminal) != (shell_pgrp = getpgrp ()))
3326 kill (- shell_pgrp, SIGTTIN);
3327
3328 /* Ignore interactive and job-control signals. */
3329 signal(SIGINT, SIG_IGN);
3330 signal(SIGQUIT, SIG_IGN);
3331 signal(SIGTERM, SIG_IGN);
3332 signal(SIGTSTP, SIG_IGN);
3333 signal(SIGTTIN, SIG_IGN);
3334 signal(SIGTTOU, SIG_IGN);
3335 signal(SIGCHLD, SIG_IGN);
3336
3337 /* Put ourselves in our own process group. */
3338 setsid();
3339 shell_pgrp = getpid ();
3340 setpgid (shell_pgrp, shell_pgrp);
3341
3342 /* Grab control of the terminal. */
3343 tcsetpgrp(shell_terminal, shell_pgrp);
3344 }
3345
3346 int hush_main(int argc, char * const *argv)
3347 {
3348 int opt;
3349 FILE *input;
3350 char **e = environ;
3351
3352 /* XXX what should these be while sourcing /etc/profile? */
3353 global_argc = argc;
3354 global_argv = argv;
3355
3356 /* (re?) initialize globals. Sometimes hush_main() ends up calling
3357 * hush_main(), therefore we cannot rely on the BSS to zero out this
3358 * stuff. Reset these to 0 every time. */
3359 ifs = NULL;
3360 /* map[] is taken care of with call to update_ifs_map() */
3361 fake_mode = 0;
3362 interactive = 0;
3363 close_me_head = NULL;
3364 last_bg_pid = 0;
3365 job_list = NULL;
3366 last_jobid = 0;
3367
3368 /* Initialize some more globals to non-zero values */
3369 set_cwd();
3370 #ifdef CONFIG_FEATURE_COMMAND_EDITING
3371 cmdedit_set_initial_prompt();
3372 #else
3373 PS1 = NULL;
3374 #endif
3375 PS2 = "> ";
3376
3377 /* initialize our shell local variables with the values
3378 * currently living in the environment */
3379 if (e) {
3380 for (; *e; e++)
3381 set_local_var(*e, 2); /* without call putenv() */
3382 }
3383
3384 last_return_code=EXIT_SUCCESS;
3385
3386
3387 if (argv[0] && argv[0][0] == '-') {
3388 debug_printf("\nsourcing /etc/profile\n");
3389 if ((input = fopen("/etc/profile", "r")) != NULL) {
3390 mark_open(fileno(input));
3391 parse_file_outer(input);
3392 mark_closed(fileno(input));
3393 fclose(input);
3394 }
3395 }
3396 input=stdin;
3397
3398 while ((opt = getopt(argc, argv, "c:xif")) > 0) {
3399 switch (opt) {
3400 case 'c':
3401 {
3402 global_argv = argv+optind;
3403 global_argc = argc-optind;
3404 opt = parse_string_outer(optarg, FLAG_PARSE_SEMICOLON);
3405 goto final_return;
3406 }
3407 break;
3408 case 'i':
3409 interactive++;
3410 break;
3411 case 'f':
3412 fake_mode++;
3413 break;
3414 default:
3415 #ifndef BB_VER
3416 fprintf(stderr, "Usage: sh [FILE]...\n"
3417 " or: sh -c command [args]...\n\n");
3418 exit(EXIT_FAILURE);
3419 #else
3420 show_usage();
3421 #endif
3422 }
3423 }
3424 /* A shell is interactive if the `-i' flag was given, or if all of
3425 * the following conditions are met:
3426 * no -c command
3427 * no arguments remaining or the -s flag given
3428 * standard input is a terminal
3429 * standard output is a terminal
3430 * Refer to Posix.2, the description of the `sh' utility. */
3431 if (argv[optind]==NULL && input==stdin &&
3432 isatty(fileno(stdin)) && isatty(fileno(stdout))) {
3433 interactive++;
3434 }
3435
3436 debug_printf("\ninteractive=%d\n", interactive);
3437 if (interactive) {
3438 /* Looks like they want an interactive shell */
3439 #ifndef CONFIG_FEATURE_SH_EXTRA_QUIET
3440 printf( "\n\n" BB_BANNER " hush - the humble shell v0.01 (testing)\n");
3441 printf( "Enter 'help' for a list of built-in commands.\n\n");
3442 #endif
3443 setup_job_control();
3444 }
3445
3446 if (argv[optind]==NULL) {
3447 opt=parse_file_outer(stdin);
3448 goto final_return;
3449 }
3450
3451 debug_printf("\nrunning script '%s'\n", argv[optind]);
3452 global_argv = argv+optind;
3453 global_argc = argc-optind;
3454 input = xfopen(argv[optind], "r");
3455 opt = parse_file_outer(input);
3456
3457 #ifdef CONFIG_FEATURE_CLEAN_UP
3458 fclose(input);
3459 if (cwd && cwd != unknown)
3460 free((char*)cwd);
3461 {
3462 struct variables *cur, *tmp;
3463 for(cur = top_vars; cur; cur = tmp) {
3464 tmp = cur->next;
3465 if (!cur->flg_read_only) {
3466 free(cur->name);
3467 free(cur->value);
3468 free(cur);
3469 }
3470 }
3471 }
3472 #endif
3473
3474 final_return:
3475 return(opt?opt:last_return_code);
3476 }
3477 #endif
3478
3479 static char *insert_var_value(char *inp)
3480 {
3481 return insert_var_value_sub(inp, 0);
3482 }
3483
3484 static char *insert_var_value_sub(char *inp, int tag_subst)
3485 {
3486 int res_str_len = 0;
3487 int len;
3488 int done = 0;
3489 char *p, *p1, *res_str = NULL;
3490
3491 while ((p = strchr(inp, SPECIAL_VAR_SYMBOL))) {
3492 /* check the beginning of the string for normal charachters */
3493 if (p != inp) {
3494 /* copy any charachters to the result string */
3495 len = p - inp;
3496 res_str = xrealloc(res_str, (res_str_len + len));
3497 strncpy((res_str + res_str_len), inp, len);
3498 res_str_len += len;
3499 }
3500 inp = ++p;
3501 /* find the ending marker */
3502 p = strchr(inp, SPECIAL_VAR_SYMBOL);
3503 *p = '\0';
3504 /* look up the value to substitute */
3505 if ((p1 = lookup_param(inp))) {
3506 if (tag_subst)
3507 len = res_str_len + strlen(p1) + 2;
3508 else
3509 len = res_str_len + strlen(p1);
3510 res_str = xrealloc(res_str, (1 + len));
3511 if (tag_subst) {
3512 /*
3513 * copy the variable value to the result
3514 * string
3515 */
3516 strcpy((res_str + res_str_len + 1), p1);
3517
3518 /*
3519 * mark the replaced text to be accepted as
3520 * is
3521 */
3522 res_str[res_str_len] = SUBSTED_VAR_SYMBOL;
3523 res_str[res_str_len + 1 + strlen(p1)] =
3524 SUBSTED_VAR_SYMBOL;
3525 } else
3526 /*
3527 * copy the variable value to the result
3528 * string
3529 */
3530 strcpy((res_str + res_str_len), p1);
3531
3532 res_str_len = len;
3533 }
3534 *p = SPECIAL_VAR_SYMBOL;
3535 inp = ++p;
3536 done = 1;
3537 }
3538 if (done) {
3539 res_str = xrealloc(res_str, (1 + res_str_len + strlen(inp)));
3540 strcpy((res_str + res_str_len), inp);
3541 while ((p = strchr(res_str, '\n'))) {
3542 *p = ' ';
3543 }
3544 }
3545 return (res_str == NULL) ? inp : res_str;
3546 }
3547
3548 static char **make_list_in(char **inp, char *name)
3549 {
3550 int len, i;
3551 int name_len = strlen(name);
3552 int n = 0;
3553 char **list;
3554 char *p1, *p2, *p3;
3555
3556 /* create list of variable values */
3557 list = xmalloc(sizeof(*list));
3558 for (i = 0; inp[i]; i++) {
3559 p3 = insert_var_value(inp[i]);
3560 p1 = p3;
3561 while (*p1) {
3562 if ((*p1 == ' ')) {
3563 p1++;
3564 continue;
3565 }
3566 if ((p2 = strchr(p1, ' '))) {
3567 len = p2 - p1;
3568 } else {
3569 len = strlen(p1);
3570 p2 = p1 + len;
3571 }
3572 /* we use n + 2 in realloc for list,because we add
3573 * new element and then we will add NULL element */
3574 list = xrealloc(list, sizeof(*list) * (n + 2));
3575 list[n] = xmalloc(2 + name_len + len);
3576 strcpy(list[n], name);
3577 strcat(list[n], "=");
3578 strncat(list[n], p1, len);
3579 list[n++][name_len + len + 1] = '\0';
3580 p1 = p2;
3581 }
3582 if (p3 != inp[i]) free(p3);
3583 }
3584 list[n] = NULL;
3585 return list;
3586 }
3587
3588 /* Make new string for parser */
3589 static char * make_string(char ** inp)
3590 {
3591 char *p;
3592 char *str = NULL;
3593 int n;
3594 int len = 2;
3595 char *noeval_str;
3596 int noeval = 0;
3597
3598 noeval_str = get_local_var("HUSH_NO_EVAL");
3599 if (noeval_str != NULL && *noeval_str != '0' && *noeval_str != '\0')
3600 noeval = 1;
3601 for (n = 0; inp[n]; n++) {
3602 p = insert_var_value_sub(inp[n], noeval);
3603 str = xrealloc(str, (len + strlen(p)));
3604 if (n) {
3605 strcat(str, " ");
3606 } else {
3607 *str = '\0';
3608 }
3609 strcat(str, p);
3610 len = strlen(str) + 3;
3611 if (p != inp[n]) free(p);
3612 }
3613 len = strlen(str);
3614 *(str + len) = '\n';
3615 *(str + len + 1) = '\0';
3616 return str;
3617 }
3618
3619 #ifdef __U_BOOT__
3620 static int do_showvar(cmd_tbl_t *cmdtp, int flag, int argc,
3621 char * const argv[])
3622 {
3623 int i, k;
3624 int rcode = 0;
3625 struct variables *cur;
3626
3627 if (argc == 1) { /* Print all env variables */
3628 for (cur = top_vars; cur; cur = cur->next) {
3629 printf ("%s=%s\n", cur->name, cur->value);
3630 if (ctrlc ()) {
3631 puts ("\n ** Abort\n");
3632 return 1;
3633 }
3634 }
3635 return 0;
3636 }
3637 for (i = 1; i < argc; ++i) { /* print single env variables */
3638 char *name = argv[i];
3639
3640 k = -1;
3641 for (cur = top_vars; cur; cur = cur->next) {
3642 if(strcmp (cur->name, name) == 0) {
3643 k = 0;
3644 printf ("%s=%s\n", cur->name, cur->value);
3645 }
3646 if (ctrlc ()) {
3647 puts ("\n ** Abort\n");
3648 return 1;
3649 }
3650 }
3651 if (k < 0) {
3652 printf ("## Error: \"%s\" not defined\n", name);
3653 rcode ++;
3654 }
3655 }
3656 return rcode;
3657 }
3658
3659 U_BOOT_CMD(
3660 showvar, CONFIG_SYS_MAXARGS, 1, do_showvar,
3661 "print local hushshell variables",
3662 "\n - print values of all hushshell variables\n"
3663 "showvar name ...\n"
3664 " - print value of hushshell variable 'name'"
3665 );
3666
3667 #endif
3668 /****************************************************************************/
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