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Merge branch 'master' of git://www.denx.de/git/u-boot-imx
[people/ms/u-boot.git] / common / cli_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 <console.h>
83 #include <bootretry.h>
84 #include <cli.h>
85 #include <cli_hush.h>
86 #include <command.h> /* find_cmd */
87 #ifndef CONFIG_SYS_PROMPT_HUSH_PS2
88 #define CONFIG_SYS_PROMPT_HUSH_PS2 "> "
89 #endif
90 #endif
91 #ifndef __U_BOOT__
92 #include <ctype.h> /* isalpha, isdigit */
93 #include <unistd.h> /* getpid */
94 #include <stdlib.h> /* getenv, atoi */
95 #include <string.h> /* strchr */
96 #include <stdio.h> /* popen etc. */
97 #include <glob.h> /* glob, of course */
98 #include <stdarg.h> /* va_list */
99 #include <errno.h>
100 #include <fcntl.h>
101 #include <getopt.h> /* should be pretty obvious */
102
103 #include <sys/stat.h> /* ulimit */
104 #include <sys/types.h>
105 #include <sys/wait.h>
106 #include <signal.h>
107
108 /* #include <dmalloc.h> */
109
110 #if 1
111 #include "busybox.h"
112 #include "cmdedit.h"
113 #else
114 #define applet_name "hush"
115 #include "standalone.h"
116 #define hush_main main
117 #undef CONFIG_FEATURE_SH_FANCY_PROMPT
118 #define BB_BANNER
119 #endif
120 #endif
121 #define SPECIAL_VAR_SYMBOL 03
122 #define SUBSTED_VAR_SYMBOL 04
123 #ifndef __U_BOOT__
124 #define FLAG_EXIT_FROM_LOOP 1
125 #define FLAG_PARSE_SEMICOLON (1 << 1) /* symbol ';' is special for parser */
126 #define FLAG_REPARSING (1 << 2) /* >= 2nd pass */
127
128 #endif
129
130 #ifdef __U_BOOT__
131 DECLARE_GLOBAL_DATA_PTR;
132
133 #define EXIT_SUCCESS 0
134 #define EOF -1
135 #define syntax() syntax_err()
136 #define xstrdup strdup
137 #define error_msg printf
138 #else
139 typedef enum {
140 REDIRECT_INPUT = 1,
141 REDIRECT_OVERWRITE = 2,
142 REDIRECT_APPEND = 3,
143 REDIRECT_HEREIS = 4,
144 REDIRECT_IO = 5
145 } redir_type;
146
147 /* The descrip member of this structure is only used to make debugging
148 * output pretty */
149 struct {int mode; int default_fd; char *descrip;} redir_table[] = {
150 { 0, 0, "()" },
151 { O_RDONLY, 0, "<" },
152 { O_CREAT|O_TRUNC|O_WRONLY, 1, ">" },
153 { O_CREAT|O_APPEND|O_WRONLY, 1, ">>" },
154 { O_RDONLY, -1, "<<" },
155 { O_RDWR, 1, "<>" }
156 };
157 #endif
158
159 typedef enum {
160 PIPE_SEQ = 1,
161 PIPE_AND = 2,
162 PIPE_OR = 3,
163 PIPE_BG = 4,
164 } pipe_style;
165
166 /* might eventually control execution */
167 typedef enum {
168 RES_NONE = 0,
169 RES_IF = 1,
170 RES_THEN = 2,
171 RES_ELIF = 3,
172 RES_ELSE = 4,
173 RES_FI = 5,
174 RES_FOR = 6,
175 RES_WHILE = 7,
176 RES_UNTIL = 8,
177 RES_DO = 9,
178 RES_DONE = 10,
179 RES_XXXX = 11,
180 RES_IN = 12,
181 RES_SNTX = 13
182 } reserved_style;
183 #define FLAG_END (1<<RES_NONE)
184 #define FLAG_IF (1<<RES_IF)
185 #define FLAG_THEN (1<<RES_THEN)
186 #define FLAG_ELIF (1<<RES_ELIF)
187 #define FLAG_ELSE (1<<RES_ELSE)
188 #define FLAG_FI (1<<RES_FI)
189 #define FLAG_FOR (1<<RES_FOR)
190 #define FLAG_WHILE (1<<RES_WHILE)
191 #define FLAG_UNTIL (1<<RES_UNTIL)
192 #define FLAG_DO (1<<RES_DO)
193 #define FLAG_DONE (1<<RES_DONE)
194 #define FLAG_IN (1<<RES_IN)
195 #define FLAG_START (1<<RES_XXXX)
196
197 /* This holds pointers to the various results of parsing */
198 struct p_context {
199 struct child_prog *child;
200 struct pipe *list_head;
201 struct pipe *pipe;
202 #ifndef __U_BOOT__
203 struct redir_struct *pending_redirect;
204 #endif
205 reserved_style w;
206 int old_flag; /* for figuring out valid reserved words */
207 struct p_context *stack;
208 int type; /* define type of parser : ";$" common or special symbol */
209 /* How about quoting status? */
210 };
211
212 #ifndef __U_BOOT__
213 struct redir_struct {
214 redir_type type; /* type of redirection */
215 int fd; /* file descriptor being redirected */
216 int dup; /* -1, or file descriptor being duplicated */
217 struct redir_struct *next; /* pointer to the next redirect in the list */
218 glob_t word; /* *word.gl_pathv is the filename */
219 };
220 #endif
221
222 struct child_prog {
223 #ifndef __U_BOOT__
224 pid_t pid; /* 0 if exited */
225 #endif
226 char **argv; /* program name and arguments */
227 /* was quoted when parsed; copy of struct o_string.nonnull field */
228 int *argv_nonnull;
229 #ifdef __U_BOOT__
230 int argc; /* number of program arguments */
231 #endif
232 struct pipe *group; /* if non-NULL, first in group or subshell */
233 #ifndef __U_BOOT__
234 int subshell; /* flag, non-zero if group must be forked */
235 struct redir_struct *redirects; /* I/O redirections */
236 glob_t glob_result; /* result of parameter globbing */
237 int is_stopped; /* is the program currently running? */
238 struct pipe *family; /* pointer back to the child's parent pipe */
239 #endif
240 int sp; /* number of SPECIAL_VAR_SYMBOL */
241 int type;
242 };
243
244 struct pipe {
245 #ifndef __U_BOOT__
246 int jobid; /* job number */
247 #endif
248 int num_progs; /* total number of programs in job */
249 #ifndef __U_BOOT__
250 int running_progs; /* number of programs running */
251 char *text; /* name of job */
252 char *cmdbuf; /* buffer various argv's point into */
253 pid_t pgrp; /* process group ID for the job */
254 #endif
255 struct child_prog *progs; /* array of commands in pipe */
256 struct pipe *next; /* to track background commands */
257 #ifndef __U_BOOT__
258 int stopped_progs; /* number of programs alive, but stopped */
259 int job_context; /* bitmask defining current context */
260 #endif
261 pipe_style followup; /* PIPE_BG, PIPE_SEQ, PIPE_OR, PIPE_AND */
262 reserved_style r_mode; /* supports if, for, while, until */
263 };
264
265 #ifndef __U_BOOT__
266 struct close_me {
267 int fd;
268 struct close_me *next;
269 };
270 #endif
271
272 struct variables {
273 char *name;
274 char *value;
275 int flg_export;
276 int flg_read_only;
277 struct variables *next;
278 };
279
280 /* globals, connect us to the outside world
281 * the first three support $?, $#, and $1 */
282 #ifndef __U_BOOT__
283 char **global_argv;
284 unsigned int global_argc;
285 #endif
286 static unsigned int last_return_code;
287 #ifndef __U_BOOT__
288 extern char **environ; /* This is in <unistd.h>, but protected with __USE_GNU */
289 #endif
290
291 /* "globals" within this file */
292 static uchar *ifs;
293 static char map[256];
294 #ifndef __U_BOOT__
295 static int fake_mode;
296 static int interactive;
297 static struct close_me *close_me_head;
298 static const char *cwd;
299 static struct pipe *job_list;
300 static unsigned int last_bg_pid;
301 static unsigned int last_jobid;
302 static unsigned int shell_terminal;
303 static char *PS1;
304 static char *PS2;
305 struct variables shell_ver = { "HUSH_VERSION", "0.01", 1, 1, 0 };
306 struct variables *top_vars = &shell_ver;
307 #else
308 static int flag_repeat = 0;
309 static int do_repeat = 0;
310 static struct variables *top_vars = NULL ;
311 #endif /*__U_BOOT__ */
312
313 #define B_CHUNK (100)
314 #define B_NOSPAC 1
315
316 typedef struct {
317 char *data;
318 int length;
319 int maxlen;
320 int quote;
321 int nonnull;
322 } o_string;
323 #define NULL_O_STRING {NULL,0,0,0,0}
324 /* used for initialization:
325 o_string foo = NULL_O_STRING; */
326
327 /* I can almost use ordinary FILE *. Is open_memstream() universally
328 * available? Where is it documented? */
329 struct in_str {
330 const char *p;
331 #ifndef __U_BOOT__
332 char peek_buf[2];
333 #endif
334 int __promptme;
335 int promptmode;
336 #ifndef __U_BOOT__
337 FILE *file;
338 #endif
339 int (*get) (struct in_str *);
340 int (*peek) (struct in_str *);
341 };
342 #define b_getch(input) ((input)->get(input))
343 #define b_peek(input) ((input)->peek(input))
344
345 #ifndef __U_BOOT__
346 #define JOB_STATUS_FORMAT "[%d] %-22s %.40s\n"
347
348 struct built_in_command {
349 char *cmd; /* name */
350 char *descr; /* description */
351 int (*function) (struct child_prog *); /* function ptr */
352 };
353 #endif
354
355 /* define DEBUG_SHELL for debugging output (obviously ;-)) */
356 #if 0
357 #define DEBUG_SHELL
358 #endif
359
360 /* This should be in utility.c */
361 #ifdef DEBUG_SHELL
362 #ifndef __U_BOOT__
363 static void debug_printf(const char *format, ...)
364 {
365 va_list args;
366 va_start(args, format);
367 vfprintf(stderr, format, args);
368 va_end(args);
369 }
370 #else
371 #define debug_printf(fmt,args...) printf (fmt ,##args)
372 #endif
373 #else
374 static inline void debug_printf(const char *format, ...) { }
375 #endif
376 #define final_printf debug_printf
377
378 #ifdef __U_BOOT__
379 static void syntax_err(void) {
380 printf("syntax error\n");
381 }
382 #else
383 static void __syntax(char *file, int line) {
384 error_msg("syntax error %s:%d", file, line);
385 }
386 #define syntax() __syntax(__FILE__, __LINE__)
387 #endif
388
389 #ifdef __U_BOOT__
390 static void *xmalloc(size_t size);
391 static void *xrealloc(void *ptr, size_t size);
392 #else
393 /* Index of subroutines: */
394 /* function prototypes for builtins */
395 static int builtin_cd(struct child_prog *child);
396 static int builtin_env(struct child_prog *child);
397 static int builtin_eval(struct child_prog *child);
398 static int builtin_exec(struct child_prog *child);
399 static int builtin_exit(struct child_prog *child);
400 static int builtin_export(struct child_prog *child);
401 static int builtin_fg_bg(struct child_prog *child);
402 static int builtin_help(struct child_prog *child);
403 static int builtin_jobs(struct child_prog *child);
404 static int builtin_pwd(struct child_prog *child);
405 static int builtin_read(struct child_prog *child);
406 static int builtin_set(struct child_prog *child);
407 static int builtin_shift(struct child_prog *child);
408 static int builtin_source(struct child_prog *child);
409 static int builtin_umask(struct child_prog *child);
410 static int builtin_unset(struct child_prog *child);
411 static int builtin_not_written(struct child_prog *child);
412 #endif
413 /* o_string manipulation: */
414 static int b_check_space(o_string *o, int len);
415 static int b_addchr(o_string *o, int ch);
416 static void b_reset(o_string *o);
417 static int b_addqchr(o_string *o, int ch, int quote);
418 #ifndef __U_BOOT__
419 static int b_adduint(o_string *o, unsigned int i);
420 #endif
421 /* in_str manipulations: */
422 static int static_get(struct in_str *i);
423 static int static_peek(struct in_str *i);
424 static int file_get(struct in_str *i);
425 static int file_peek(struct in_str *i);
426 #ifndef __U_BOOT__
427 static void setup_file_in_str(struct in_str *i, FILE *f);
428 #else
429 static void setup_file_in_str(struct in_str *i);
430 #endif
431 static void setup_string_in_str(struct in_str *i, const char *s);
432 #ifndef __U_BOOT__
433 /* close_me manipulations: */
434 static void mark_open(int fd);
435 static void mark_closed(int fd);
436 static void close_all(void);
437 #endif
438 /* "run" the final data structures: */
439 static char *indenter(int i);
440 static int free_pipe_list(struct pipe *head, int indent);
441 static int free_pipe(struct pipe *pi, int indent);
442 /* really run the final data structures: */
443 #ifndef __U_BOOT__
444 static int setup_redirects(struct child_prog *prog, int squirrel[]);
445 #endif
446 static int run_list_real(struct pipe *pi);
447 #ifndef __U_BOOT__
448 static void pseudo_exec(struct child_prog *child) __attribute__ ((noreturn));
449 #endif
450 static int run_pipe_real(struct pipe *pi);
451 /* extended glob support: */
452 #ifndef __U_BOOT__
453 static int globhack(const char *src, int flags, glob_t *pglob);
454 static int glob_needed(const char *s);
455 static int xglob(o_string *dest, int flags, glob_t *pglob);
456 #endif
457 /* variable assignment: */
458 static int is_assignment(const char *s);
459 /* data structure manipulation: */
460 #ifndef __U_BOOT__
461 static int setup_redirect(struct p_context *ctx, int fd, redir_type style, struct in_str *input);
462 #endif
463 static void initialize_context(struct p_context *ctx);
464 static int done_word(o_string *dest, struct p_context *ctx);
465 static int done_command(struct p_context *ctx);
466 static int done_pipe(struct p_context *ctx, pipe_style type);
467 /* primary string parsing: */
468 #ifndef __U_BOOT__
469 static int redirect_dup_num(struct in_str *input);
470 static int redirect_opt_num(o_string *o);
471 static int process_command_subs(o_string *dest, struct p_context *ctx, struct in_str *input, int subst_end);
472 static int parse_group(o_string *dest, struct p_context *ctx, struct in_str *input, int ch);
473 #endif
474 static char *lookup_param(char *src);
475 static char *make_string(char **inp, int *nonnull);
476 static int handle_dollar(o_string *dest, struct p_context *ctx, struct in_str *input);
477 #ifndef __U_BOOT__
478 static int parse_string(o_string *dest, struct p_context *ctx, const char *src);
479 #endif
480 static int parse_stream(o_string *dest, struct p_context *ctx, struct in_str *input0, int end_trigger);
481 /* setup: */
482 static int parse_stream_outer(struct in_str *inp, int flag);
483 #ifndef __U_BOOT__
484 static int parse_string_outer(const char *s, int flag);
485 static int parse_file_outer(FILE *f);
486 #endif
487 #ifndef __U_BOOT__
488 /* job management: */
489 static int checkjobs(struct pipe* fg_pipe);
490 static void insert_bg_job(struct pipe *pi);
491 static void remove_bg_job(struct pipe *pi);
492 #endif
493 /* local variable support */
494 static char **make_list_in(char **inp, char *name);
495 static char *insert_var_value(char *inp);
496 static char *insert_var_value_sub(char *inp, int tag_subst);
497
498 #ifndef __U_BOOT__
499 /* Table of built-in functions. They can be forked or not, depending on
500 * context: within pipes, they fork. As simple commands, they do not.
501 * When used in non-forking context, they can change global variables
502 * in the parent shell process. If forked, of course they can not.
503 * For example, 'unset foo | whatever' will parse and run, but foo will
504 * still be set at the end. */
505 static struct built_in_command bltins[] = {
506 {"bg", "Resume a job in the background", builtin_fg_bg},
507 {"break", "Exit for, while or until loop", builtin_not_written},
508 {"cd", "Change working directory", builtin_cd},
509 {"continue", "Continue for, while or until loop", builtin_not_written},
510 {"env", "Print all environment variables", builtin_env},
511 {"eval", "Construct and run shell command", builtin_eval},
512 {"exec", "Exec command, replacing this shell with the exec'd process",
513 builtin_exec},
514 {"exit", "Exit from shell()", builtin_exit},
515 {"export", "Set environment variable", builtin_export},
516 {"fg", "Bring job into the foreground", builtin_fg_bg},
517 {"jobs", "Lists the active jobs", builtin_jobs},
518 {"pwd", "Print current directory", builtin_pwd},
519 {"read", "Input environment variable", builtin_read},
520 {"return", "Return from a function", builtin_not_written},
521 {"set", "Set/unset shell local variables", builtin_set},
522 {"shift", "Shift positional parameters", builtin_shift},
523 {"trap", "Trap signals", builtin_not_written},
524 {"ulimit","Controls resource limits", builtin_not_written},
525 {"umask","Sets file creation mask", builtin_umask},
526 {"unset", "Unset environment variable", builtin_unset},
527 {".", "Source-in and run commands in a file", builtin_source},
528 {"help", "List shell built-in commands", builtin_help},
529 {NULL, NULL, NULL}
530 };
531
532 static const char *set_cwd(void)
533 {
534 if(cwd==unknown)
535 cwd = NULL; /* xgetcwd(arg) called free(arg) */
536 cwd = xgetcwd((char *)cwd);
537 if (!cwd)
538 cwd = unknown;
539 return cwd;
540 }
541
542 /* built-in 'eval' handler */
543 static int builtin_eval(struct child_prog *child)
544 {
545 char *str = NULL;
546 int rcode = EXIT_SUCCESS;
547
548 if (child->argv[1]) {
549 str = make_string(child->argv + 1);
550 parse_string_outer(str, FLAG_EXIT_FROM_LOOP |
551 FLAG_PARSE_SEMICOLON);
552 free(str);
553 rcode = last_return_code;
554 }
555 return rcode;
556 }
557
558 /* built-in 'cd <path>' handler */
559 static int builtin_cd(struct child_prog *child)
560 {
561 char *newdir;
562 if (child->argv[1] == NULL)
563 newdir = getenv("HOME");
564 else
565 newdir = child->argv[1];
566 if (chdir(newdir)) {
567 printf("cd: %s: %s\n", newdir, strerror(errno));
568 return EXIT_FAILURE;
569 }
570 set_cwd();
571 return EXIT_SUCCESS;
572 }
573
574 /* built-in 'env' handler */
575 static int builtin_env(struct child_prog *dummy)
576 {
577 char **e = environ;
578 if (e == NULL) return EXIT_FAILURE;
579 for (; *e; e++) {
580 puts(*e);
581 }
582 return EXIT_SUCCESS;
583 }
584
585 /* built-in 'exec' handler */
586 static int builtin_exec(struct child_prog *child)
587 {
588 if (child->argv[1] == NULL)
589 return EXIT_SUCCESS; /* Really? */
590 child->argv++;
591 pseudo_exec(child);
592 /* never returns */
593 }
594
595 /* built-in 'exit' handler */
596 static int builtin_exit(struct child_prog *child)
597 {
598 if (child->argv[1] == NULL)
599 exit(last_return_code);
600 exit (atoi(child->argv[1]));
601 }
602
603 /* built-in 'export VAR=value' handler */
604 static int builtin_export(struct child_prog *child)
605 {
606 int res = 0;
607 char *name = child->argv[1];
608
609 if (name == NULL) {
610 return (builtin_env(child));
611 }
612
613 name = strdup(name);
614
615 if(name) {
616 char *value = strchr(name, '=');
617
618 if (!value) {
619 char *tmp;
620 /* They are exporting something without an =VALUE */
621
622 value = get_local_var(name);
623 if (value) {
624 size_t ln = strlen(name);
625
626 tmp = realloc(name, ln+strlen(value)+2);
627 if(tmp==NULL)
628 res = -1;
629 else {
630 sprintf(tmp+ln, "=%s", value);
631 name = tmp;
632 }
633 } else {
634 /* bash does not return an error when trying to export
635 * an undefined variable. Do likewise. */
636 res = 1;
637 }
638 }
639 }
640 if (res<0)
641 perror_msg("export");
642 else if(res==0)
643 res = set_local_var(name, 1);
644 else
645 res = 0;
646 free(name);
647 return res;
648 }
649
650 /* built-in 'fg' and 'bg' handler */
651 static int builtin_fg_bg(struct child_prog *child)
652 {
653 int i, jobnum;
654 struct pipe *pi=NULL;
655
656 if (!interactive)
657 return EXIT_FAILURE;
658 /* If they gave us no args, assume they want the last backgrounded task */
659 if (!child->argv[1]) {
660 for (pi = job_list; pi; pi = pi->next) {
661 if (pi->jobid == last_jobid) {
662 break;
663 }
664 }
665 if (!pi) {
666 error_msg("%s: no current job", child->argv[0]);
667 return EXIT_FAILURE;
668 }
669 } else {
670 if (sscanf(child->argv[1], "%%%d", &jobnum) != 1) {
671 error_msg("%s: bad argument '%s'", child->argv[0], child->argv[1]);
672 return EXIT_FAILURE;
673 }
674 for (pi = job_list; pi; pi = pi->next) {
675 if (pi->jobid == jobnum) {
676 break;
677 }
678 }
679 if (!pi) {
680 error_msg("%s: %d: no such job", child->argv[0], jobnum);
681 return EXIT_FAILURE;
682 }
683 }
684
685 if (*child->argv[0] == 'f') {
686 /* Put the job into the foreground. */
687 tcsetpgrp(shell_terminal, pi->pgrp);
688 }
689
690 /* Restart the processes in the job */
691 for (i = 0; i < pi->num_progs; i++)
692 pi->progs[i].is_stopped = 0;
693
694 if ( (i=kill(- pi->pgrp, SIGCONT)) < 0) {
695 if (i == ESRCH) {
696 remove_bg_job(pi);
697 } else {
698 perror_msg("kill (SIGCONT)");
699 }
700 }
701
702 pi->stopped_progs = 0;
703 return EXIT_SUCCESS;
704 }
705
706 /* built-in 'help' handler */
707 static int builtin_help(struct child_prog *dummy)
708 {
709 struct built_in_command *x;
710
711 printf("\nBuilt-in commands:\n");
712 printf("-------------------\n");
713 for (x = bltins; x->cmd; x++) {
714 if (x->descr==NULL)
715 continue;
716 printf("%s\t%s\n", x->cmd, x->descr);
717 }
718 printf("\n\n");
719 return EXIT_SUCCESS;
720 }
721
722 /* built-in 'jobs' handler */
723 static int builtin_jobs(struct child_prog *child)
724 {
725 struct pipe *job;
726 char *status_string;
727
728 for (job = job_list; job; job = job->next) {
729 if (job->running_progs == job->stopped_progs)
730 status_string = "Stopped";
731 else
732 status_string = "Running";
733
734 printf(JOB_STATUS_FORMAT, job->jobid, status_string, job->text);
735 }
736 return EXIT_SUCCESS;
737 }
738
739
740 /* built-in 'pwd' handler */
741 static int builtin_pwd(struct child_prog *dummy)
742 {
743 puts(set_cwd());
744 return EXIT_SUCCESS;
745 }
746
747 /* built-in 'read VAR' handler */
748 static int builtin_read(struct child_prog *child)
749 {
750 int res;
751
752 if (child->argv[1]) {
753 char string[BUFSIZ];
754 char *var = 0;
755
756 string[0] = 0; /* In case stdin has only EOF */
757 /* read string */
758 fgets(string, sizeof(string), stdin);
759 chomp(string);
760 var = malloc(strlen(child->argv[1])+strlen(string)+2);
761 if(var) {
762 sprintf(var, "%s=%s", child->argv[1], string);
763 res = set_local_var(var, 0);
764 } else
765 res = -1;
766 if (res)
767 fprintf(stderr, "read: %m\n");
768 free(var); /* So not move up to avoid breaking errno */
769 return res;
770 } else {
771 do res=getchar(); while(res!='\n' && res!=EOF);
772 return 0;
773 }
774 }
775
776 /* built-in 'set VAR=value' handler */
777 static int builtin_set(struct child_prog *child)
778 {
779 char *temp = child->argv[1];
780 struct variables *e;
781
782 if (temp == NULL)
783 for(e = top_vars; e; e=e->next)
784 printf("%s=%s\n", e->name, e->value);
785 else
786 set_local_var(temp, 0);
787
788 return EXIT_SUCCESS;
789 }
790
791
792 /* Built-in 'shift' handler */
793 static int builtin_shift(struct child_prog *child)
794 {
795 int n=1;
796 if (child->argv[1]) {
797 n=atoi(child->argv[1]);
798 }
799 if (n>=0 && n<global_argc) {
800 /* XXX This probably breaks $0 */
801 global_argc -= n;
802 global_argv += n;
803 return EXIT_SUCCESS;
804 } else {
805 return EXIT_FAILURE;
806 }
807 }
808
809 /* Built-in '.' handler (read-in and execute commands from file) */
810 static int builtin_source(struct child_prog *child)
811 {
812 FILE *input;
813 int status;
814
815 if (child->argv[1] == NULL)
816 return EXIT_FAILURE;
817
818 /* XXX search through $PATH is missing */
819 input = fopen(child->argv[1], "r");
820 if (!input) {
821 error_msg("Couldn't open file '%s'", child->argv[1]);
822 return EXIT_FAILURE;
823 }
824
825 /* Now run the file */
826 /* XXX argv and argc are broken; need to save old global_argv
827 * (pointer only is OK!) on this stack frame,
828 * set global_argv=child->argv+1, recurse, and restore. */
829 mark_open(fileno(input));
830 status = parse_file_outer(input);
831 mark_closed(fileno(input));
832 fclose(input);
833 return (status);
834 }
835
836 static int builtin_umask(struct child_prog *child)
837 {
838 mode_t new_umask;
839 const char *arg = child->argv[1];
840 char *end;
841 if (arg) {
842 new_umask=strtoul(arg, &end, 8);
843 if (*end!='\0' || end == arg) {
844 return EXIT_FAILURE;
845 }
846 } else {
847 printf("%.3o\n", (unsigned int) (new_umask=umask(0)));
848 }
849 umask(new_umask);
850 return EXIT_SUCCESS;
851 }
852
853 /* built-in 'unset VAR' handler */
854 static int builtin_unset(struct child_prog *child)
855 {
856 /* bash returned already true */
857 unset_local_var(child->argv[1]);
858 return EXIT_SUCCESS;
859 }
860
861 static int builtin_not_written(struct child_prog *child)
862 {
863 printf("builtin_%s not written\n",child->argv[0]);
864 return EXIT_FAILURE;
865 }
866 #endif
867
868 static int b_check_space(o_string *o, int len)
869 {
870 /* It would be easy to drop a more restrictive policy
871 * in here, such as setting a maximum string length */
872 if (o->length + len > o->maxlen) {
873 char *old_data = o->data;
874 /* assert (data == NULL || o->maxlen != 0); */
875 o->maxlen += max(2*len, B_CHUNK);
876 o->data = realloc(o->data, 1 + o->maxlen);
877 if (o->data == NULL) {
878 free(old_data);
879 }
880 }
881 return o->data == NULL;
882 }
883
884 static int b_addchr(o_string *o, int ch)
885 {
886 debug_printf("b_addchr: %c %d %p\n", ch, o->length, o);
887 if (b_check_space(o, 1)) return B_NOSPAC;
888 o->data[o->length] = ch;
889 o->length++;
890 o->data[o->length] = '\0';
891 return 0;
892 }
893
894 static void b_reset(o_string *o)
895 {
896 o->length = 0;
897 o->nonnull = 0;
898 if (o->data != NULL) *o->data = '\0';
899 }
900
901 static void b_free(o_string *o)
902 {
903 b_reset(o);
904 free(o->data);
905 o->data = NULL;
906 o->maxlen = 0;
907 }
908
909 /* My analysis of quoting semantics tells me that state information
910 * is associated with a destination, not a source.
911 */
912 static int b_addqchr(o_string *o, int ch, int quote)
913 {
914 if (quote && strchr("*?[\\",ch)) {
915 int rc;
916 rc = b_addchr(o, '\\');
917 if (rc) return rc;
918 }
919 return b_addchr(o, ch);
920 }
921
922 #ifndef __U_BOOT__
923 static int b_adduint(o_string *o, unsigned int i)
924 {
925 int r;
926 char *p = simple_itoa(i);
927 /* no escape checking necessary */
928 do r=b_addchr(o, *p++); while (r==0 && *p);
929 return r;
930 }
931 #endif
932
933 static int static_get(struct in_str *i)
934 {
935 int ch = *i->p++;
936 if (ch=='\0') return EOF;
937 return ch;
938 }
939
940 static int static_peek(struct in_str *i)
941 {
942 return *i->p;
943 }
944
945 #ifndef __U_BOOT__
946 static inline void cmdedit_set_initial_prompt(void)
947 {
948 #ifndef CONFIG_FEATURE_SH_FANCY_PROMPT
949 PS1 = NULL;
950 #else
951 PS1 = getenv("PS1");
952 if(PS1==0)
953 PS1 = "\\w \\$ ";
954 #endif
955 }
956
957 static inline void setup_prompt_string(int promptmode, char **prompt_str)
958 {
959 debug_printf("setup_prompt_string %d ",promptmode);
960 #ifndef CONFIG_FEATURE_SH_FANCY_PROMPT
961 /* Set up the prompt */
962 if (promptmode == 1) {
963 free(PS1);
964 PS1=xmalloc(strlen(cwd)+4);
965 sprintf(PS1, "%s %s", cwd, ( geteuid() != 0 ) ? "$ ":"# ");
966 *prompt_str = PS1;
967 } else {
968 *prompt_str = PS2;
969 }
970 #else
971 *prompt_str = (promptmode==1)? PS1 : PS2;
972 #endif
973 debug_printf("result %s\n",*prompt_str);
974 }
975 #endif
976
977 static void get_user_input(struct in_str *i)
978 {
979 #ifndef __U_BOOT__
980 char *prompt_str;
981 static char the_command[BUFSIZ];
982
983 setup_prompt_string(i->promptmode, &prompt_str);
984 #ifdef CONFIG_FEATURE_COMMAND_EDITING
985 /*
986 ** enable command line editing only while a command line
987 ** is actually being read; otherwise, we'll end up bequeathing
988 ** atexit() handlers and other unwanted stuff to our
989 ** child processes (rob@sysgo.de)
990 */
991 cmdedit_read_input(prompt_str, the_command);
992 #else
993 fputs(prompt_str, stdout);
994 fflush(stdout);
995 the_command[0]=fgetc(i->file);
996 the_command[1]='\0';
997 #endif
998 fflush(stdout);
999 i->p = the_command;
1000 #else
1001 int n;
1002 static char the_command[CONFIG_SYS_CBSIZE + 1];
1003
1004 bootretry_reset_cmd_timeout();
1005 i->__promptme = 1;
1006 if (i->promptmode == 1) {
1007 n = cli_readline(CONFIG_SYS_PROMPT);
1008 } else {
1009 n = cli_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 child->argv_nonnull + i);
1618 parse_string_outer(str, FLAG_EXIT_FROM_LOOP | FLAG_REPARSING);
1619 free(str);
1620 return last_return_code;
1621 }
1622 #ifndef __U_BOOT__
1623 for (x = bltins; x->cmd; x++) {
1624 if (strcmp(child->argv[i], x->cmd) == 0 ) {
1625 int squirrel[] = {-1, -1, -1};
1626 int rcode;
1627 if (x->function == builtin_exec && child->argv[i+1]==NULL) {
1628 debug_printf("magic exec\n");
1629 setup_redirects(child,NULL);
1630 return EXIT_SUCCESS;
1631 }
1632 debug_printf("builtin inline %s\n", child->argv[0]);
1633 /* XXX setup_redirects acts on file descriptors, not FILEs.
1634 * This is perfect for work that comes after exec().
1635 * Is it really safe for inline use? Experimentally,
1636 * things seem to work with glibc. */
1637 setup_redirects(child, squirrel);
1638
1639 child->argv += i; /* XXX horrible hack */
1640 rcode = x->function(child);
1641 /* XXX restore hack so free() can work right */
1642 child->argv -= i;
1643 restore_redirects(squirrel);
1644 }
1645 return rcode;
1646 }
1647 #else
1648 /* check ";", because ,example , argv consist from
1649 * "help;flinfo" must not execute
1650 */
1651 if (strchr(child->argv[i], ';')) {
1652 printf("Unknown command '%s' - try 'help' or use "
1653 "'run' command\n", child->argv[i]);
1654 return -1;
1655 }
1656 /* Process the command */
1657 return cmd_process(flag, child->argc, child->argv,
1658 &flag_repeat, NULL);
1659 #endif
1660 }
1661 #ifndef __U_BOOT__
1662
1663 for (i = 0; i < pi->num_progs; i++) {
1664 child = & (pi->progs[i]);
1665
1666 /* pipes are inserted between pairs of commands */
1667 if ((i + 1) < pi->num_progs) {
1668 if (pipe(pipefds)<0) perror_msg_and_die("pipe");
1669 nextout = pipefds[1];
1670 } else {
1671 nextout=1;
1672 pipefds[0] = -1;
1673 }
1674
1675 /* XXX test for failed fork()? */
1676 if (!(child->pid = fork())) {
1677 /* Set the handling for job control signals back to the default. */
1678 signal(SIGINT, SIG_DFL);
1679 signal(SIGQUIT, SIG_DFL);
1680 signal(SIGTERM, SIG_DFL);
1681 signal(SIGTSTP, SIG_DFL);
1682 signal(SIGTTIN, SIG_DFL);
1683 signal(SIGTTOU, SIG_DFL);
1684 signal(SIGCHLD, SIG_DFL);
1685
1686 close_all();
1687
1688 if (nextin != 0) {
1689 dup2(nextin, 0);
1690 close(nextin);
1691 }
1692 if (nextout != 1) {
1693 dup2(nextout, 1);
1694 close(nextout);
1695 }
1696 if (pipefds[0]!=-1) {
1697 close(pipefds[0]); /* opposite end of our output pipe */
1698 }
1699
1700 /* Like bash, explicit redirects override pipes,
1701 * and the pipe fd is available for dup'ing. */
1702 setup_redirects(child,NULL);
1703
1704 if (interactive && pi->followup!=PIPE_BG) {
1705 /* If we (the child) win the race, put ourselves in the process
1706 * group whose leader is the first process in this pipe. */
1707 if (pi->pgrp < 0) {
1708 pi->pgrp = getpid();
1709 }
1710 if (setpgid(0, pi->pgrp) == 0) {
1711 tcsetpgrp(2, pi->pgrp);
1712 }
1713 }
1714
1715 pseudo_exec(child);
1716 }
1717
1718
1719 /* put our child in the process group whose leader is the
1720 first process in this pipe */
1721 if (pi->pgrp < 0) {
1722 pi->pgrp = child->pid;
1723 }
1724 /* Don't check for errors. The child may be dead already,
1725 * in which case setpgid returns error code EACCES. */
1726 setpgid(child->pid, pi->pgrp);
1727
1728 if (nextin != 0)
1729 close(nextin);
1730 if (nextout != 1)
1731 close(nextout);
1732
1733 /* If there isn't another process, nextin is garbage
1734 but it doesn't matter */
1735 nextin = pipefds[0];
1736 }
1737 #endif
1738 return -1;
1739 }
1740
1741 static int run_list_real(struct pipe *pi)
1742 {
1743 char *save_name = NULL;
1744 char **list = NULL;
1745 char **save_list = NULL;
1746 struct pipe *rpipe;
1747 int flag_rep = 0;
1748 #ifndef __U_BOOT__
1749 int save_num_progs;
1750 #endif
1751 int rcode=0, flag_skip=1;
1752 int flag_restore = 0;
1753 int if_code=0, next_if_code=0; /* need double-buffer to handle elif */
1754 reserved_style rmode, skip_more_in_this_rmode=RES_XXXX;
1755 /* check syntax for "for" */
1756 for (rpipe = pi; rpipe; rpipe = rpipe->next) {
1757 if ((rpipe->r_mode == RES_IN ||
1758 rpipe->r_mode == RES_FOR) &&
1759 (rpipe->next == NULL)) {
1760 syntax();
1761 #ifdef __U_BOOT__
1762 flag_repeat = 0;
1763 #endif
1764 return 1;
1765 }
1766 if ((rpipe->r_mode == RES_IN &&
1767 (rpipe->next->r_mode == RES_IN &&
1768 rpipe->next->progs->argv != NULL))||
1769 (rpipe->r_mode == RES_FOR &&
1770 rpipe->next->r_mode != RES_IN)) {
1771 syntax();
1772 #ifdef __U_BOOT__
1773 flag_repeat = 0;
1774 #endif
1775 return 1;
1776 }
1777 }
1778 for (; pi; pi = (flag_restore != 0) ? rpipe : pi->next) {
1779 if (pi->r_mode == RES_WHILE || pi->r_mode == RES_UNTIL ||
1780 pi->r_mode == RES_FOR) {
1781 #ifdef __U_BOOT__
1782 /* check Ctrl-C */
1783 ctrlc();
1784 if ((had_ctrlc())) {
1785 return 1;
1786 }
1787 #endif
1788 flag_restore = 0;
1789 if (!rpipe) {
1790 flag_rep = 0;
1791 rpipe = pi;
1792 }
1793 }
1794 rmode = pi->r_mode;
1795 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);
1796 if (rmode == skip_more_in_this_rmode && flag_skip) {
1797 if (pi->followup == PIPE_SEQ) flag_skip=0;
1798 continue;
1799 }
1800 flag_skip = 1;
1801 skip_more_in_this_rmode = RES_XXXX;
1802 if (rmode == RES_THEN || rmode == RES_ELSE) if_code = next_if_code;
1803 if (rmode == RES_THEN && if_code) continue;
1804 if (rmode == RES_ELSE && !if_code) continue;
1805 if (rmode == RES_ELIF && !if_code) break;
1806 if (rmode == RES_FOR && pi->num_progs) {
1807 if (!list) {
1808 /* if no variable values after "in" we skip "for" */
1809 if (!pi->next->progs->argv) continue;
1810 /* create list of variable values */
1811 list = make_list_in(pi->next->progs->argv,
1812 pi->progs->argv[0]);
1813 save_list = list;
1814 save_name = pi->progs->argv[0];
1815 pi->progs->argv[0] = NULL;
1816 flag_rep = 1;
1817 }
1818 if (!(*list)) {
1819 free(pi->progs->argv[0]);
1820 free(save_list);
1821 list = NULL;
1822 flag_rep = 0;
1823 pi->progs->argv[0] = save_name;
1824 #ifndef __U_BOOT__
1825 pi->progs->glob_result.gl_pathv[0] =
1826 pi->progs->argv[0];
1827 #endif
1828 continue;
1829 } else {
1830 /* insert new value from list for variable */
1831 if (pi->progs->argv[0])
1832 free(pi->progs->argv[0]);
1833 pi->progs->argv[0] = *list++;
1834 #ifndef __U_BOOT__
1835 pi->progs->glob_result.gl_pathv[0] =
1836 pi->progs->argv[0];
1837 #endif
1838 }
1839 }
1840 if (rmode == RES_IN) continue;
1841 if (rmode == RES_DO) {
1842 if (!flag_rep) continue;
1843 }
1844 if (rmode == RES_DONE) {
1845 if (flag_rep) {
1846 flag_restore = 1;
1847 } else {
1848 rpipe = NULL;
1849 }
1850 }
1851 if (pi->num_progs == 0) continue;
1852 #ifndef __U_BOOT__
1853 save_num_progs = pi->num_progs; /* save number of programs */
1854 #endif
1855 rcode = run_pipe_real(pi);
1856 debug_printf("run_pipe_real returned %d\n",rcode);
1857 #ifndef __U_BOOT__
1858 if (rcode!=-1) {
1859 /* We only ran a builtin: rcode was set by the return value
1860 * of run_pipe_real(), and we don't need to wait for anything. */
1861 } else if (pi->followup==PIPE_BG) {
1862 /* XXX check bash's behavior with nontrivial pipes */
1863 /* XXX compute jobid */
1864 /* XXX what does bash do with attempts to background builtins? */
1865 insert_bg_job(pi);
1866 rcode = EXIT_SUCCESS;
1867 } else {
1868 if (interactive) {
1869 /* move the new process group into the foreground */
1870 if (tcsetpgrp(shell_terminal, pi->pgrp) && errno != ENOTTY)
1871 perror_msg("tcsetpgrp-3");
1872 rcode = checkjobs(pi);
1873 /* move the shell to the foreground */
1874 if (tcsetpgrp(shell_terminal, getpgid(0)) && errno != ENOTTY)
1875 perror_msg("tcsetpgrp-4");
1876 } else {
1877 rcode = checkjobs(pi);
1878 }
1879 debug_printf("checkjobs returned %d\n",rcode);
1880 }
1881 last_return_code=rcode;
1882 #else
1883 if (rcode < -1) {
1884 last_return_code = -rcode - 2;
1885 return -2; /* exit */
1886 }
1887 last_return_code=(rcode == 0) ? 0 : 1;
1888 #endif
1889 #ifndef __U_BOOT__
1890 pi->num_progs = save_num_progs; /* restore number of programs */
1891 #endif
1892 if ( rmode == RES_IF || rmode == RES_ELIF )
1893 next_if_code=rcode; /* can be overwritten a number of times */
1894 if (rmode == RES_WHILE)
1895 flag_rep = !last_return_code;
1896 if (rmode == RES_UNTIL)
1897 flag_rep = last_return_code;
1898 if ( (rcode==EXIT_SUCCESS && pi->followup==PIPE_OR) ||
1899 (rcode!=EXIT_SUCCESS && pi->followup==PIPE_AND) )
1900 skip_more_in_this_rmode=rmode;
1901 #ifndef __U_BOOT__
1902 checkjobs(NULL);
1903 #endif
1904 }
1905 return rcode;
1906 }
1907
1908 /* broken, of course, but OK for testing */
1909 static char *indenter(int i)
1910 {
1911 static char blanks[]=" ";
1912 return &blanks[sizeof(blanks)-i-1];
1913 }
1914
1915 /* return code is the exit status of the pipe */
1916 static int free_pipe(struct pipe *pi, int indent)
1917 {
1918 char **p;
1919 struct child_prog *child;
1920 #ifndef __U_BOOT__
1921 struct redir_struct *r, *rnext;
1922 #endif
1923 int a, i, ret_code=0;
1924 char *ind = indenter(indent);
1925
1926 #ifndef __U_BOOT__
1927 if (pi->stopped_progs > 0)
1928 return ret_code;
1929 final_printf("%s run pipe: (pid %d)\n",ind,getpid());
1930 #endif
1931 for (i=0; i<pi->num_progs; i++) {
1932 child = &pi->progs[i];
1933 final_printf("%s command %d:\n",ind,i);
1934 if (child->argv) {
1935 for (a=0,p=child->argv; *p; a++,p++) {
1936 final_printf("%s argv[%d] = %s\n",ind,a,*p);
1937 }
1938 #ifndef __U_BOOT__
1939 globfree(&child->glob_result);
1940 #else
1941 for (a = 0; a < child->argc; a++) {
1942 free(child->argv[a]);
1943 }
1944 free(child->argv);
1945 free(child->argv_nonnull);
1946 child->argc = 0;
1947 #endif
1948 child->argv=NULL;
1949 } else if (child->group) {
1950 #ifndef __U_BOOT__
1951 final_printf("%s begin group (subshell:%d)\n",ind, child->subshell);
1952 #endif
1953 ret_code = free_pipe_list(child->group,indent+3);
1954 final_printf("%s end group\n",ind);
1955 } else {
1956 final_printf("%s (nil)\n",ind);
1957 }
1958 #ifndef __U_BOOT__
1959 for (r=child->redirects; r; r=rnext) {
1960 final_printf("%s redirect %d%s", ind, r->fd, redir_table[r->type].descrip);
1961 if (r->dup == -1) {
1962 /* guard against the case >$FOO, where foo is unset or blank */
1963 if (r->word.gl_pathv) {
1964 final_printf(" %s\n", *r->word.gl_pathv);
1965 globfree(&r->word);
1966 }
1967 } else {
1968 final_printf("&%d\n", r->dup);
1969 }
1970 rnext=r->next;
1971 free(r);
1972 }
1973 child->redirects=NULL;
1974 #endif
1975 }
1976 free(pi->progs); /* children are an array, they get freed all at once */
1977 pi->progs=NULL;
1978 return ret_code;
1979 }
1980
1981 static int free_pipe_list(struct pipe *head, int indent)
1982 {
1983 int rcode=0; /* if list has no members */
1984 struct pipe *pi, *next;
1985 char *ind = indenter(indent);
1986 for (pi=head; pi; pi=next) {
1987 final_printf("%s pipe reserved mode %d\n", ind, pi->r_mode);
1988 rcode = free_pipe(pi, indent);
1989 final_printf("%s pipe followup code %d\n", ind, pi->followup);
1990 next=pi->next;
1991 pi->next=NULL;
1992 free(pi);
1993 }
1994 return rcode;
1995 }
1996
1997 /* Select which version we will use */
1998 static int run_list(struct pipe *pi)
1999 {
2000 int rcode=0;
2001 #ifndef __U_BOOT__
2002 if (fake_mode==0) {
2003 #endif
2004 rcode = run_list_real(pi);
2005 #ifndef __U_BOOT__
2006 }
2007 #endif
2008 /* free_pipe_list has the side effect of clearing memory
2009 * In the long run that function can be merged with run_list_real,
2010 * but doing that now would hobble the debugging effort. */
2011 free_pipe_list(pi,0);
2012 return rcode;
2013 }
2014
2015 /* The API for glob is arguably broken. This routine pushes a non-matching
2016 * string into the output structure, removing non-backslashed backslashes.
2017 * If someone can prove me wrong, by performing this function within the
2018 * original glob(3) api, feel free to rewrite this routine into oblivion.
2019 * Return code (0 vs. GLOB_NOSPACE) matches glob(3).
2020 * XXX broken if the last character is '\\', check that before calling.
2021 */
2022 #ifndef __U_BOOT__
2023 static int globhack(const char *src, int flags, glob_t *pglob)
2024 {
2025 int cnt=0, pathc;
2026 const char *s;
2027 char *dest;
2028 for (cnt=1, s=src; s && *s; s++) {
2029 if (*s == '\\') s++;
2030 cnt++;
2031 }
2032 dest = malloc(cnt);
2033 if (!dest) return GLOB_NOSPACE;
2034 if (!(flags & GLOB_APPEND)) {
2035 pglob->gl_pathv=NULL;
2036 pglob->gl_pathc=0;
2037 pglob->gl_offs=0;
2038 pglob->gl_offs=0;
2039 }
2040 pathc = ++pglob->gl_pathc;
2041 pglob->gl_pathv = realloc(pglob->gl_pathv, (pathc+1)*sizeof(*pglob->gl_pathv));
2042 if (pglob->gl_pathv == NULL) return GLOB_NOSPACE;
2043 pglob->gl_pathv[pathc-1]=dest;
2044 pglob->gl_pathv[pathc]=NULL;
2045 for (s=src; s && *s; s++, dest++) {
2046 if (*s == '\\') s++;
2047 *dest = *s;
2048 }
2049 *dest='\0';
2050 return 0;
2051 }
2052
2053 /* XXX broken if the last character is '\\', check that before calling */
2054 static int glob_needed(const char *s)
2055 {
2056 for (; *s; s++) {
2057 if (*s == '\\') s++;
2058 if (strchr("*[?",*s)) return 1;
2059 }
2060 return 0;
2061 }
2062
2063 #if 0
2064 static void globprint(glob_t *pglob)
2065 {
2066 int i;
2067 debug_printf("glob_t at %p:\n", pglob);
2068 debug_printf(" gl_pathc=%d gl_pathv=%p gl_offs=%d gl_flags=%d\n",
2069 pglob->gl_pathc, pglob->gl_pathv, pglob->gl_offs, pglob->gl_flags);
2070 for (i=0; i<pglob->gl_pathc; i++)
2071 debug_printf("pglob->gl_pathv[%d] = %p = %s\n", i,
2072 pglob->gl_pathv[i], pglob->gl_pathv[i]);
2073 }
2074 #endif
2075
2076 static int xglob(o_string *dest, int flags, glob_t *pglob)
2077 {
2078 int gr;
2079
2080 /* short-circuit for null word */
2081 /* we can code this better when the debug_printf's are gone */
2082 if (dest->length == 0) {
2083 if (dest->nonnull) {
2084 /* bash man page calls this an "explicit" null */
2085 gr = globhack(dest->data, flags, pglob);
2086 debug_printf("globhack returned %d\n",gr);
2087 } else {
2088 return 0;
2089 }
2090 } else if (glob_needed(dest->data)) {
2091 gr = glob(dest->data, flags, NULL, pglob);
2092 debug_printf("glob returned %d\n",gr);
2093 if (gr == GLOB_NOMATCH) {
2094 /* quote removal, or more accurately, backslash removal */
2095 gr = globhack(dest->data, flags, pglob);
2096 debug_printf("globhack returned %d\n",gr);
2097 }
2098 } else {
2099 gr = globhack(dest->data, flags, pglob);
2100 debug_printf("globhack returned %d\n",gr);
2101 }
2102 if (gr == GLOB_NOSPACE)
2103 error_msg_and_die("out of memory during glob");
2104 if (gr != 0) { /* GLOB_ABORTED ? */
2105 error_msg("glob(3) error %d",gr);
2106 }
2107 /* globprint(glob_target); */
2108 return gr;
2109 }
2110 #endif
2111
2112 #ifdef __U_BOOT__
2113 static char *get_dollar_var(char ch);
2114 #endif
2115
2116 /* This is used to get/check local shell variables */
2117 char *get_local_var(const char *s)
2118 {
2119 struct variables *cur;
2120
2121 if (!s)
2122 return NULL;
2123
2124 #ifdef __U_BOOT__
2125 if (*s == '$')
2126 return get_dollar_var(s[1]);
2127 #endif
2128
2129 for (cur = top_vars; cur; cur=cur->next)
2130 if(strcmp(cur->name, s)==0)
2131 return cur->value;
2132 return NULL;
2133 }
2134
2135 /* This is used to set local shell variables
2136 flg_export==0 if only local (not exporting) variable
2137 flg_export==1 if "new" exporting environ
2138 flg_export>1 if current startup environ (not call putenv()) */
2139 int set_local_var(const char *s, int flg_export)
2140 {
2141 char *name, *value;
2142 int result=0;
2143 struct variables *cur;
2144
2145 #ifdef __U_BOOT__
2146 /* might be possible! */
2147 if (!isalpha(*s))
2148 return -1;
2149 #endif
2150
2151 name=strdup(s);
2152
2153 #ifdef __U_BOOT__
2154 if (getenv(name) != NULL) {
2155 printf ("ERROR: "
2156 "There is a global environment variable with the same name.\n");
2157 free(name);
2158 return -1;
2159 }
2160 #endif
2161 /* Assume when we enter this function that we are already in
2162 * NAME=VALUE format. So the first order of business is to
2163 * split 's' on the '=' into 'name' and 'value' */
2164 value = strchr(name, '=');
2165 if (value == NULL || *(value + 1) == 0) {
2166 free(name);
2167 return -1;
2168 }
2169 *value++ = 0;
2170
2171 for(cur = top_vars; cur; cur = cur->next) {
2172 if(strcmp(cur->name, name)==0)
2173 break;
2174 }
2175
2176 if(cur) {
2177 if(strcmp(cur->value, value)==0) {
2178 if(flg_export>0 && cur->flg_export==0)
2179 cur->flg_export=flg_export;
2180 else
2181 result++;
2182 } else {
2183 if(cur->flg_read_only) {
2184 error_msg("%s: readonly variable", name);
2185 result = -1;
2186 } else {
2187 if(flg_export>0 || cur->flg_export>1)
2188 cur->flg_export=1;
2189 free(cur->value);
2190
2191 cur->value = strdup(value);
2192 }
2193 }
2194 } else {
2195 cur = malloc(sizeof(struct variables));
2196 if(!cur) {
2197 result = -1;
2198 } else {
2199 cur->name = strdup(name);
2200 if (cur->name == NULL) {
2201 free(cur);
2202 result = -1;
2203 } else {
2204 struct variables *bottom = top_vars;
2205 cur->value = strdup(value);
2206 cur->next = NULL;
2207 cur->flg_export = flg_export;
2208 cur->flg_read_only = 0;
2209 while(bottom->next) bottom=bottom->next;
2210 bottom->next = cur;
2211 }
2212 }
2213 }
2214
2215 #ifndef __U_BOOT__
2216 if(result==0 && cur->flg_export==1) {
2217 *(value-1) = '=';
2218 result = putenv(name);
2219 } else {
2220 #endif
2221 free(name);
2222 #ifndef __U_BOOT__
2223 if(result>0) /* equivalent to previous set */
2224 result = 0;
2225 }
2226 #endif
2227 return result;
2228 }
2229
2230 void unset_local_var(const char *name)
2231 {
2232 struct variables *cur;
2233
2234 if (name) {
2235 for (cur = top_vars; cur; cur=cur->next) {
2236 if(strcmp(cur->name, name)==0)
2237 break;
2238 }
2239 if (cur != NULL) {
2240 struct variables *next = top_vars;
2241 if(cur->flg_read_only) {
2242 error_msg("%s: readonly variable", name);
2243 return;
2244 } else {
2245 #ifndef __U_BOOT__
2246 if(cur->flg_export)
2247 unsetenv(cur->name);
2248 #endif
2249 free(cur->name);
2250 free(cur->value);
2251 while (next->next != cur)
2252 next = next->next;
2253 next->next = cur->next;
2254 }
2255 free(cur);
2256 }
2257 }
2258 }
2259
2260 static int is_assignment(const char *s)
2261 {
2262 if (s == NULL)
2263 return 0;
2264
2265 if (!isalpha(*s)) return 0;
2266 ++s;
2267 while(isalnum(*s) || *s=='_') ++s;
2268 return *s=='=';
2269 }
2270
2271 #ifndef __U_BOOT__
2272 /* the src parameter allows us to peek forward to a possible &n syntax
2273 * for file descriptor duplication, e.g., "2>&1".
2274 * Return code is 0 normally, 1 if a syntax error is detected in src.
2275 * Resource errors (in xmalloc) cause the process to exit */
2276 static int setup_redirect(struct p_context *ctx, int fd, redir_type style,
2277 struct in_str *input)
2278 {
2279 struct child_prog *child=ctx->child;
2280 struct redir_struct *redir = child->redirects;
2281 struct redir_struct *last_redir=NULL;
2282
2283 /* Create a new redir_struct and drop it onto the end of the linked list */
2284 while(redir) {
2285 last_redir=redir;
2286 redir=redir->next;
2287 }
2288 redir = xmalloc(sizeof(struct redir_struct));
2289 redir->next=NULL;
2290 redir->word.gl_pathv=NULL;
2291 if (last_redir) {
2292 last_redir->next=redir;
2293 } else {
2294 child->redirects=redir;
2295 }
2296
2297 redir->type=style;
2298 redir->fd= (fd==-1) ? redir_table[style].default_fd : fd ;
2299
2300 debug_printf("Redirect type %d%s\n", redir->fd, redir_table[style].descrip);
2301
2302 /* Check for a '2>&1' type redirect */
2303 redir->dup = redirect_dup_num(input);
2304 if (redir->dup == -2) return 1; /* syntax error */
2305 if (redir->dup != -1) {
2306 /* Erik had a check here that the file descriptor in question
2307 * is legit; I postpone that to "run time"
2308 * A "-" representation of "close me" shows up as a -3 here */
2309 debug_printf("Duplicating redirect '%d>&%d'\n", redir->fd, redir->dup);
2310 } else {
2311 /* We do _not_ try to open the file that src points to,
2312 * since we need to return and let src be expanded first.
2313 * Set ctx->pending_redirect, so we know what to do at the
2314 * end of the next parsed word.
2315 */
2316 ctx->pending_redirect = redir;
2317 }
2318 return 0;
2319 }
2320 #endif
2321
2322 static struct pipe *new_pipe(void)
2323 {
2324 struct pipe *pi;
2325 pi = xmalloc(sizeof(struct pipe));
2326 pi->num_progs = 0;
2327 pi->progs = NULL;
2328 pi->next = NULL;
2329 pi->followup = 0; /* invalid */
2330 pi->r_mode = RES_NONE;
2331 return pi;
2332 }
2333
2334 static void initialize_context(struct p_context *ctx)
2335 {
2336 ctx->pipe=NULL;
2337 #ifndef __U_BOOT__
2338 ctx->pending_redirect=NULL;
2339 #endif
2340 ctx->child=NULL;
2341 ctx->list_head=new_pipe();
2342 ctx->pipe=ctx->list_head;
2343 ctx->w=RES_NONE;
2344 ctx->stack=NULL;
2345 #ifdef __U_BOOT__
2346 ctx->old_flag=0;
2347 #endif
2348 done_command(ctx); /* creates the memory for working child */
2349 }
2350
2351 /* normal return is 0
2352 * if a reserved word is found, and processed, return 1
2353 * should handle if, then, elif, else, fi, for, while, until, do, done.
2354 * case, function, and select are obnoxious, save those for later.
2355 */
2356 struct reserved_combo {
2357 char *literal;
2358 int code;
2359 long flag;
2360 };
2361 /* Mostly a list of accepted follow-up reserved words.
2362 * FLAG_END means we are done with the sequence, and are ready
2363 * to turn the compound list into a command.
2364 * FLAG_START means the word must start a new compound list.
2365 */
2366 static struct reserved_combo reserved_list[] = {
2367 { "if", RES_IF, FLAG_THEN | FLAG_START },
2368 { "then", RES_THEN, FLAG_ELIF | FLAG_ELSE | FLAG_FI },
2369 { "elif", RES_ELIF, FLAG_THEN },
2370 { "else", RES_ELSE, FLAG_FI },
2371 { "fi", RES_FI, FLAG_END },
2372 { "for", RES_FOR, FLAG_IN | FLAG_START },
2373 { "while", RES_WHILE, FLAG_DO | FLAG_START },
2374 { "until", RES_UNTIL, FLAG_DO | FLAG_START },
2375 { "in", RES_IN, FLAG_DO },
2376 { "do", RES_DO, FLAG_DONE },
2377 { "done", RES_DONE, FLAG_END }
2378 };
2379 #define NRES (sizeof(reserved_list)/sizeof(struct reserved_combo))
2380
2381 static int reserved_word(o_string *dest, struct p_context *ctx)
2382 {
2383 struct reserved_combo *r;
2384 for (r=reserved_list;
2385 r<reserved_list+NRES; r++) {
2386 if (strcmp(dest->data, r->literal) == 0) {
2387 debug_printf("found reserved word %s, code %d\n",r->literal,r->code);
2388 if (r->flag & FLAG_START) {
2389 struct p_context *new = xmalloc(sizeof(struct p_context));
2390 debug_printf("push stack\n");
2391 if (ctx->w == RES_IN || ctx->w == RES_FOR) {
2392 syntax();
2393 free(new);
2394 ctx->w = RES_SNTX;
2395 b_reset(dest);
2396 return 1;
2397 }
2398 *new = *ctx; /* physical copy */
2399 initialize_context(ctx);
2400 ctx->stack=new;
2401 } else if ( ctx->w == RES_NONE || ! (ctx->old_flag & (1<<r->code))) {
2402 syntax();
2403 ctx->w = RES_SNTX;
2404 b_reset(dest);
2405 return 1;
2406 }
2407 ctx->w=r->code;
2408 ctx->old_flag = r->flag;
2409 if (ctx->old_flag & FLAG_END) {
2410 struct p_context *old;
2411 debug_printf("pop stack\n");
2412 done_pipe(ctx,PIPE_SEQ);
2413 old = ctx->stack;
2414 old->child->group = ctx->list_head;
2415 #ifndef __U_BOOT__
2416 old->child->subshell = 0;
2417 #endif
2418 *ctx = *old; /* physical copy */
2419 free(old);
2420 }
2421 b_reset (dest);
2422 return 1;
2423 }
2424 }
2425 return 0;
2426 }
2427
2428 /* normal return is 0.
2429 * Syntax or xglob errors return 1. */
2430 static int done_word(o_string *dest, struct p_context *ctx)
2431 {
2432 struct child_prog *child=ctx->child;
2433 #ifndef __U_BOOT__
2434 glob_t *glob_target;
2435 int gr, flags = 0;
2436 #else
2437 char *str, *s;
2438 int argc, cnt;
2439 #endif
2440
2441 debug_printf("done_word: %s %p\n", dest->data, child);
2442 if (dest->length == 0 && !dest->nonnull) {
2443 debug_printf(" true null, ignored\n");
2444 return 0;
2445 }
2446 #ifndef __U_BOOT__
2447 if (ctx->pending_redirect) {
2448 glob_target = &ctx->pending_redirect->word;
2449 } else {
2450 #endif
2451 if (child->group) {
2452 syntax();
2453 return 1; /* syntax error, groups and arglists don't mix */
2454 }
2455 if (!child->argv && (ctx->type & FLAG_PARSE_SEMICOLON)) {
2456 debug_printf("checking %s for reserved-ness\n",dest->data);
2457 if (reserved_word(dest,ctx)) return ctx->w==RES_SNTX;
2458 }
2459 #ifndef __U_BOOT__
2460 glob_target = &child->glob_result;
2461 if (child->argv) flags |= GLOB_APPEND;
2462 #else
2463 for (cnt = 1, s = dest->data; s && *s; s++) {
2464 if (*s == '\\') s++;
2465 cnt++;
2466 }
2467 str = malloc(cnt);
2468 if (!str) return 1;
2469 if ( child->argv == NULL) {
2470 child->argc=0;
2471 }
2472 argc = ++child->argc;
2473 child->argv = realloc(child->argv, (argc+1)*sizeof(*child->argv));
2474 if (child->argv == NULL) {
2475 free(str);
2476 return 1;
2477 }
2478 child->argv_nonnull = realloc(child->argv_nonnull,
2479 (argc+1)*sizeof(*child->argv_nonnull));
2480 if (child->argv_nonnull == NULL) {
2481 free(str);
2482 return 1;
2483 }
2484 child->argv[argc-1]=str;
2485 child->argv_nonnull[argc-1] = dest->nonnull;
2486 child->argv[argc]=NULL;
2487 child->argv_nonnull[argc] = 0;
2488 for (s = dest->data; s && *s; s++,str++) {
2489 if (*s == '\\') s++;
2490 *str = *s;
2491 }
2492 *str = '\0';
2493 #endif
2494 #ifndef __U_BOOT__
2495 }
2496 gr = xglob(dest, flags, glob_target);
2497 if (gr != 0) return 1;
2498 #endif
2499
2500 b_reset(dest);
2501 #ifndef __U_BOOT__
2502 if (ctx->pending_redirect) {
2503 ctx->pending_redirect=NULL;
2504 if (glob_target->gl_pathc != 1) {
2505 error_msg("ambiguous redirect");
2506 return 1;
2507 }
2508 } else {
2509 child->argv = glob_target->gl_pathv;
2510 }
2511 #endif
2512 if (ctx->w == RES_FOR) {
2513 done_word(dest,ctx);
2514 done_pipe(ctx,PIPE_SEQ);
2515 }
2516 return 0;
2517 }
2518
2519 /* The only possible error here is out of memory, in which case
2520 * xmalloc exits. */
2521 static int done_command(struct p_context *ctx)
2522 {
2523 /* The child is really already in the pipe structure, so
2524 * advance the pipe counter and make a new, null child.
2525 * Only real trickiness here is that the uncommitted
2526 * child structure, to which ctx->child points, is not
2527 * counted in pi->num_progs. */
2528 struct pipe *pi=ctx->pipe;
2529 struct child_prog *prog=ctx->child;
2530
2531 if (prog && prog->group == NULL
2532 && prog->argv == NULL
2533 #ifndef __U_BOOT__
2534 && prog->redirects == NULL) {
2535 #else
2536 ) {
2537 #endif
2538 debug_printf("done_command: skipping null command\n");
2539 return 0;
2540 } else if (prog) {
2541 pi->num_progs++;
2542 debug_printf("done_command: num_progs incremented to %d\n",pi->num_progs);
2543 } else {
2544 debug_printf("done_command: initializing\n");
2545 }
2546 pi->progs = xrealloc(pi->progs, sizeof(*pi->progs) * (pi->num_progs+1));
2547
2548 prog = pi->progs + pi->num_progs;
2549 #ifndef __U_BOOT__
2550 prog->redirects = NULL;
2551 #endif
2552 prog->argv = NULL;
2553 prog->argv_nonnull = NULL;
2554 #ifndef __U_BOOT__
2555 prog->is_stopped = 0;
2556 #endif
2557 prog->group = NULL;
2558 #ifndef __U_BOOT__
2559 prog->glob_result.gl_pathv = NULL;
2560 prog->family = pi;
2561 #endif
2562 prog->sp = 0;
2563 ctx->child = prog;
2564 prog->type = ctx->type;
2565
2566 /* but ctx->pipe and ctx->list_head remain unchanged */
2567 return 0;
2568 }
2569
2570 static int done_pipe(struct p_context *ctx, pipe_style type)
2571 {
2572 struct pipe *new_p;
2573 done_command(ctx); /* implicit closure of previous command */
2574 debug_printf("done_pipe, type %d\n", type);
2575 ctx->pipe->followup = type;
2576 ctx->pipe->r_mode = ctx->w;
2577 new_p=new_pipe();
2578 ctx->pipe->next = new_p;
2579 ctx->pipe = new_p;
2580 ctx->child = NULL;
2581 done_command(ctx); /* set up new pipe to accept commands */
2582 return 0;
2583 }
2584
2585 #ifndef __U_BOOT__
2586 /* peek ahead in the in_str to find out if we have a "&n" construct,
2587 * as in "2>&1", that represents duplicating a file descriptor.
2588 * returns either -2 (syntax error), -1 (no &), or the number found.
2589 */
2590 static int redirect_dup_num(struct in_str *input)
2591 {
2592 int ch, d=0, ok=0;
2593 ch = b_peek(input);
2594 if (ch != '&') return -1;
2595
2596 b_getch(input); /* get the & */
2597 ch=b_peek(input);
2598 if (ch == '-') {
2599 b_getch(input);
2600 return -3; /* "-" represents "close me" */
2601 }
2602 while (isdigit(ch)) {
2603 d = d*10+(ch-'0');
2604 ok=1;
2605 b_getch(input);
2606 ch = b_peek(input);
2607 }
2608 if (ok) return d;
2609
2610 error_msg("ambiguous redirect");
2611 return -2;
2612 }
2613
2614 /* If a redirect is immediately preceded by a number, that number is
2615 * supposed to tell which file descriptor to redirect. This routine
2616 * looks for such preceding numbers. In an ideal world this routine
2617 * needs to handle all the following classes of redirects...
2618 * echo 2>foo # redirects fd 2 to file "foo", nothing passed to echo
2619 * echo 49>foo # redirects fd 49 to file "foo", nothing passed to echo
2620 * echo -2>foo # redirects fd 1 to file "foo", "-2" passed to echo
2621 * echo 49x>foo # redirects fd 1 to file "foo", "49x" passed to echo
2622 * A -1 output from this program means no valid number was found, so the
2623 * caller should use the appropriate default for this redirection.
2624 */
2625 static int redirect_opt_num(o_string *o)
2626 {
2627 int num;
2628
2629 if (o->length==0) return -1;
2630 for(num=0; num<o->length; num++) {
2631 if (!isdigit(*(o->data+num))) {
2632 return -1;
2633 }
2634 }
2635 /* reuse num (and save an int) */
2636 num=atoi(o->data);
2637 b_reset(o);
2638 return num;
2639 }
2640
2641 FILE *generate_stream_from_list(struct pipe *head)
2642 {
2643 FILE *pf;
2644 #if 1
2645 int pid, channel[2];
2646 if (pipe(channel)<0) perror_msg_and_die("pipe");
2647 pid=fork();
2648 if (pid<0) {
2649 perror_msg_and_die("fork");
2650 } else if (pid==0) {
2651 close(channel[0]);
2652 if (channel[1] != 1) {
2653 dup2(channel[1],1);
2654 close(channel[1]);
2655 }
2656 #if 0
2657 #define SURROGATE "surrogate response"
2658 write(1,SURROGATE,sizeof(SURROGATE));
2659 _exit(run_list(head));
2660 #else
2661 _exit(run_list_real(head)); /* leaks memory */
2662 #endif
2663 }
2664 debug_printf("forked child %d\n",pid);
2665 close(channel[1]);
2666 pf = fdopen(channel[0],"r");
2667 debug_printf("pipe on FILE *%p\n",pf);
2668 #else
2669 free_pipe_list(head,0);
2670 pf=popen("echo surrogate response","r");
2671 debug_printf("started fake pipe on FILE *%p\n",pf);
2672 #endif
2673 return pf;
2674 }
2675
2676 /* this version hacked for testing purposes */
2677 /* return code is exit status of the process that is run. */
2678 static int process_command_subs(o_string *dest, struct p_context *ctx, struct in_str *input, int subst_end)
2679 {
2680 int retcode;
2681 o_string result=NULL_O_STRING;
2682 struct p_context inner;
2683 FILE *p;
2684 struct in_str pipe_str;
2685 initialize_context(&inner);
2686
2687 /* recursion to generate command */
2688 retcode = parse_stream(&result, &inner, input, subst_end);
2689 if (retcode != 0) return retcode; /* syntax error or EOF */
2690 done_word(&result, &inner);
2691 done_pipe(&inner, PIPE_SEQ);
2692 b_free(&result);
2693
2694 p=generate_stream_from_list(inner.list_head);
2695 if (p==NULL) return 1;
2696 mark_open(fileno(p));
2697 setup_file_in_str(&pipe_str, p);
2698
2699 /* now send results of command back into original context */
2700 retcode = parse_stream(dest, ctx, &pipe_str, '\0');
2701 /* XXX In case of a syntax error, should we try to kill the child?
2702 * That would be tough to do right, so just read until EOF. */
2703 if (retcode == 1) {
2704 while (b_getch(&pipe_str)!=EOF) { /* discard */ };
2705 }
2706
2707 debug_printf("done reading from pipe, pclose()ing\n");
2708 /* This is the step that wait()s for the child. Should be pretty
2709 * safe, since we just read an EOF from its stdout. We could try
2710 * to better, by using wait(), and keeping track of background jobs
2711 * at the same time. That would be a lot of work, and contrary
2712 * to the KISS philosophy of this program. */
2713 mark_closed(fileno(p));
2714 retcode=pclose(p);
2715 free_pipe_list(inner.list_head,0);
2716 debug_printf("pclosed, retcode=%d\n",retcode);
2717 /* XXX this process fails to trim a single trailing newline */
2718 return retcode;
2719 }
2720
2721 static int parse_group(o_string *dest, struct p_context *ctx,
2722 struct in_str *input, int ch)
2723 {
2724 int rcode, endch=0;
2725 struct p_context sub;
2726 struct child_prog *child = ctx->child;
2727 if (child->argv) {
2728 syntax();
2729 return 1; /* syntax error, groups and arglists don't mix */
2730 }
2731 initialize_context(&sub);
2732 switch(ch) {
2733 case '(': endch=')'; child->subshell=1; break;
2734 case '{': endch='}'; break;
2735 default: syntax(); /* really logic error */
2736 }
2737 rcode=parse_stream(dest,&sub,input,endch);
2738 done_word(dest,&sub); /* finish off the final word in the subcontext */
2739 done_pipe(&sub, PIPE_SEQ); /* and the final command there, too */
2740 child->group = sub.list_head;
2741 return rcode;
2742 /* child remains "open", available for possible redirects */
2743 }
2744 #endif
2745
2746 /* basically useful version until someone wants to get fancier,
2747 * see the bash man page under "Parameter Expansion" */
2748 static char *lookup_param(char *src)
2749 {
2750 char *p;
2751 char *sep;
2752 char *default_val = NULL;
2753 int assign = 0;
2754 int expand_empty = 0;
2755
2756 if (!src)
2757 return NULL;
2758
2759 sep = strchr(src, ':');
2760
2761 if (sep) {
2762 *sep = '\0';
2763 if (*(sep + 1) == '-')
2764 default_val = sep+2;
2765 if (*(sep + 1) == '=') {
2766 default_val = sep+2;
2767 assign = 1;
2768 }
2769 if (*(sep + 1) == '+') {
2770 default_val = sep+2;
2771 expand_empty = 1;
2772 }
2773 }
2774
2775 p = getenv(src);
2776 if (!p)
2777 p = get_local_var(src);
2778
2779 if (!p || strlen(p) == 0) {
2780 p = default_val;
2781 if (assign) {
2782 char *var = malloc(strlen(src)+strlen(default_val)+2);
2783 if (var) {
2784 sprintf(var, "%s=%s", src, default_val);
2785 set_local_var(var, 0);
2786 }
2787 free(var);
2788 }
2789 } else if (expand_empty) {
2790 p += strlen(p);
2791 }
2792
2793 if (sep)
2794 *sep = ':';
2795
2796 return p;
2797 }
2798
2799 #ifdef __U_BOOT__
2800 static char *get_dollar_var(char ch)
2801 {
2802 static char buf[40];
2803
2804 buf[0] = '\0';
2805 switch (ch) {
2806 case '?':
2807 sprintf(buf, "%u", (unsigned int)last_return_code);
2808 break;
2809 default:
2810 return NULL;
2811 }
2812 return buf;
2813 }
2814 #endif
2815
2816 /* return code: 0 for OK, 1 for syntax error */
2817 static int handle_dollar(o_string *dest, struct p_context *ctx, struct in_str *input)
2818 {
2819 #ifndef __U_BOOT__
2820 int i, advance=0;
2821 #else
2822 int advance=0;
2823 #endif
2824 #ifndef __U_BOOT__
2825 char sep[]=" ";
2826 #endif
2827 int ch = input->peek(input); /* first character after the $ */
2828 debug_printf("handle_dollar: ch=%c\n",ch);
2829 if (isalpha(ch)) {
2830 b_addchr(dest, SPECIAL_VAR_SYMBOL);
2831 ctx->child->sp++;
2832 while(ch=b_peek(input),isalnum(ch) || ch=='_') {
2833 b_getch(input);
2834 b_addchr(dest,ch);
2835 }
2836 b_addchr(dest, SPECIAL_VAR_SYMBOL);
2837 #ifndef __U_BOOT__
2838 } else if (isdigit(ch)) {
2839 i = ch-'0'; /* XXX is $0 special? */
2840 if (i<global_argc) {
2841 parse_string(dest, ctx, global_argv[i]); /* recursion */
2842 }
2843 advance = 1;
2844 #endif
2845 } else switch (ch) {
2846 #ifndef __U_BOOT__
2847 case '$':
2848 b_adduint(dest,getpid());
2849 advance = 1;
2850 break;
2851 case '!':
2852 if (last_bg_pid > 0) b_adduint(dest, last_bg_pid);
2853 advance = 1;
2854 break;
2855 #endif
2856 case '?':
2857 #ifndef __U_BOOT__
2858 b_adduint(dest,last_return_code);
2859 #else
2860 ctx->child->sp++;
2861 b_addchr(dest, SPECIAL_VAR_SYMBOL);
2862 b_addchr(dest, '$');
2863 b_addchr(dest, '?');
2864 b_addchr(dest, SPECIAL_VAR_SYMBOL);
2865 #endif
2866 advance = 1;
2867 break;
2868 #ifndef __U_BOOT__
2869 case '#':
2870 b_adduint(dest,global_argc ? global_argc-1 : 0);
2871 advance = 1;
2872 break;
2873 #endif
2874 case '{':
2875 b_addchr(dest, SPECIAL_VAR_SYMBOL);
2876 ctx->child->sp++;
2877 b_getch(input);
2878 /* XXX maybe someone will try to escape the '}' */
2879 while(ch=b_getch(input),ch!=EOF && ch!='}') {
2880 b_addchr(dest,ch);
2881 }
2882 if (ch != '}') {
2883 syntax();
2884 return 1;
2885 }
2886 b_addchr(dest, SPECIAL_VAR_SYMBOL);
2887 break;
2888 #ifndef __U_BOOT__
2889 case '(':
2890 b_getch(input);
2891 process_command_subs(dest, ctx, input, ')');
2892 break;
2893 case '*':
2894 sep[0]=ifs[0];
2895 for (i=1; i<global_argc; i++) {
2896 parse_string(dest, ctx, global_argv[i]);
2897 if (i+1 < global_argc) parse_string(dest, ctx, sep);
2898 }
2899 break;
2900 case '@':
2901 case '-':
2902 case '_':
2903 /* still unhandled, but should be eventually */
2904 error_msg("unhandled syntax: $%c",ch);
2905 return 1;
2906 break;
2907 #endif
2908 default:
2909 b_addqchr(dest,'$',dest->quote);
2910 }
2911 /* Eat the character if the flag was set. If the compiler
2912 * is smart enough, we could substitute "b_getch(input);"
2913 * for all the "advance = 1;" above, and also end up with
2914 * a nice size-optimized program. Hah! That'll be the day.
2915 */
2916 if (advance) b_getch(input);
2917 return 0;
2918 }
2919
2920 #ifndef __U_BOOT__
2921 int parse_string(o_string *dest, struct p_context *ctx, const char *src)
2922 {
2923 struct in_str foo;
2924 setup_string_in_str(&foo, src);
2925 return parse_stream(dest, ctx, &foo, '\0');
2926 }
2927 #endif
2928
2929 /* return code is 0 for normal exit, 1 for syntax error */
2930 static int parse_stream(o_string *dest, struct p_context *ctx,
2931 struct in_str *input, int end_trigger)
2932 {
2933 unsigned int ch, m;
2934 #ifndef __U_BOOT__
2935 int redir_fd;
2936 redir_type redir_style;
2937 #endif
2938 int next;
2939
2940 /* Only double-quote state is handled in the state variable dest->quote.
2941 * A single-quote triggers a bypass of the main loop until its mate is
2942 * found. When recursing, quote state is passed in via dest->quote. */
2943
2944 debug_printf("parse_stream, end_trigger=%d\n",end_trigger);
2945 while ((ch=b_getch(input))!=EOF) {
2946 m = map[ch];
2947 #ifdef __U_BOOT__
2948 if (input->__promptme == 0) return 1;
2949 #endif
2950 next = (ch == '\n') ? 0 : b_peek(input);
2951
2952 debug_printf("parse_stream: ch=%c (%d) m=%d quote=%d - %c\n",
2953 ch >= ' ' ? ch : '.', ch, m,
2954 dest->quote, ctx->stack == NULL ? '*' : '.');
2955
2956 if (m==0 || ((m==1 || m==2) && dest->quote)) {
2957 b_addqchr(dest, ch, dest->quote);
2958 } else {
2959 if (m==2) { /* unquoted IFS */
2960 if (done_word(dest, ctx)) {
2961 return 1;
2962 }
2963 /* If we aren't performing a substitution, treat a newline as a
2964 * command separator. */
2965 if (end_trigger != '\0' && ch=='\n')
2966 done_pipe(ctx,PIPE_SEQ);
2967 }
2968 if (ch == end_trigger && !dest->quote && ctx->w==RES_NONE) {
2969 debug_printf("leaving parse_stream (triggered)\n");
2970 return 0;
2971 }
2972 #if 0
2973 if (ch=='\n') {
2974 /* Yahoo! Time to run with it! */
2975 done_pipe(ctx,PIPE_SEQ);
2976 run_list(ctx->list_head);
2977 initialize_context(ctx);
2978 }
2979 #endif
2980 if (m!=2) switch (ch) {
2981 case '#':
2982 if (dest->length == 0 && !dest->quote) {
2983 while(ch=b_peek(input),ch!=EOF && ch!='\n') { b_getch(input); }
2984 } else {
2985 b_addqchr(dest, ch, dest->quote);
2986 }
2987 break;
2988 case '\\':
2989 if (next == EOF) {
2990 syntax();
2991 return 1;
2992 }
2993 b_addqchr(dest, '\\', dest->quote);
2994 b_addqchr(dest, b_getch(input), dest->quote);
2995 break;
2996 case '$':
2997 if (handle_dollar(dest, ctx, input)!=0) return 1;
2998 break;
2999 case '\'':
3000 dest->nonnull = 1;
3001 while(ch=b_getch(input),ch!=EOF && ch!='\'') {
3002 #ifdef __U_BOOT__
3003 if(input->__promptme == 0) return 1;
3004 #endif
3005 b_addchr(dest,ch);
3006 }
3007 if (ch==EOF) {
3008 syntax();
3009 return 1;
3010 }
3011 break;
3012 case '"':
3013 dest->nonnull = 1;
3014 dest->quote = !dest->quote;
3015 break;
3016 #ifndef __U_BOOT__
3017 case '`':
3018 process_command_subs(dest, ctx, input, '`');
3019 break;
3020 case '>':
3021 redir_fd = redirect_opt_num(dest);
3022 done_word(dest, ctx);
3023 redir_style=REDIRECT_OVERWRITE;
3024 if (next == '>') {
3025 redir_style=REDIRECT_APPEND;
3026 b_getch(input);
3027 } else if (next == '(') {
3028 syntax(); /* until we support >(list) Process Substitution */
3029 return 1;
3030 }
3031 setup_redirect(ctx, redir_fd, redir_style, input);
3032 break;
3033 case '<':
3034 redir_fd = redirect_opt_num(dest);
3035 done_word(dest, ctx);
3036 redir_style=REDIRECT_INPUT;
3037 if (next == '<') {
3038 redir_style=REDIRECT_HEREIS;
3039 b_getch(input);
3040 } else if (next == '>') {
3041 redir_style=REDIRECT_IO;
3042 b_getch(input);
3043 } else if (next == '(') {
3044 syntax(); /* until we support <(list) Process Substitution */
3045 return 1;
3046 }
3047 setup_redirect(ctx, redir_fd, redir_style, input);
3048 break;
3049 #endif
3050 case ';':
3051 done_word(dest, ctx);
3052 done_pipe(ctx,PIPE_SEQ);
3053 break;
3054 case '&':
3055 done_word(dest, ctx);
3056 if (next=='&') {
3057 b_getch(input);
3058 done_pipe(ctx,PIPE_AND);
3059 } else {
3060 #ifndef __U_BOOT__
3061 done_pipe(ctx,PIPE_BG);
3062 #else
3063 syntax_err();
3064 return 1;
3065 #endif
3066 }
3067 break;
3068 case '|':
3069 done_word(dest, ctx);
3070 if (next=='|') {
3071 b_getch(input);
3072 done_pipe(ctx,PIPE_OR);
3073 } else {
3074 /* we could pick up a file descriptor choice here
3075 * with redirect_opt_num(), but bash doesn't do it.
3076 * "echo foo 2| cat" yields "foo 2". */
3077 #ifndef __U_BOOT__
3078 done_command(ctx);
3079 #else
3080 syntax_err();
3081 return 1;
3082 #endif
3083 }
3084 break;
3085 #ifndef __U_BOOT__
3086 case '(':
3087 case '{':
3088 if (parse_group(dest, ctx, input, ch)!=0) return 1;
3089 break;
3090 case ')':
3091 case '}':
3092 syntax(); /* Proper use of this character caught by end_trigger */
3093 return 1;
3094 break;
3095 #endif
3096 case SUBSTED_VAR_SYMBOL:
3097 dest->nonnull = 1;
3098 while (ch = b_getch(input), ch != EOF &&
3099 ch != SUBSTED_VAR_SYMBOL) {
3100 debug_printf("subst, pass=%d\n", ch);
3101 if (input->__promptme == 0)
3102 return 1;
3103 b_addchr(dest, ch);
3104 }
3105 debug_printf("subst, term=%d\n", ch);
3106 if (ch == EOF) {
3107 syntax();
3108 return 1;
3109 }
3110 break;
3111 default:
3112 syntax(); /* this is really an internal logic error */
3113 return 1;
3114 }
3115 }
3116 }
3117 /* complain if quote? No, maybe we just finished a command substitution
3118 * that was quoted. Example:
3119 * $ echo "`cat foo` plus more"
3120 * and we just got the EOF generated by the subshell that ran "cat foo"
3121 * The only real complaint is if we got an EOF when end_trigger != '\0',
3122 * that is, we were really supposed to get end_trigger, and never got
3123 * one before the EOF. Can't use the standard "syntax error" return code,
3124 * so that parse_stream_outer can distinguish the EOF and exit smoothly. */
3125 debug_printf("leaving parse_stream (EOF)\n");
3126 if (end_trigger != '\0') return -1;
3127 return 0;
3128 }
3129
3130 static void mapset(const unsigned char *set, int code)
3131 {
3132 const unsigned char *s;
3133 for (s=set; *s; s++) map[*s] = code;
3134 }
3135
3136 static void update_ifs_map(void)
3137 {
3138 /* char *ifs and char map[256] are both globals. */
3139 ifs = (uchar *)getenv("IFS");
3140 if (ifs == NULL) ifs=(uchar *)" \t\n";
3141 /* Precompute a list of 'flow through' behavior so it can be treated
3142 * quickly up front. Computation is necessary because of IFS.
3143 * Special case handling of IFS == " \t\n" is not implemented.
3144 * The map[] array only really needs two bits each, and on most machines
3145 * that would be faster because of the reduced L1 cache footprint.
3146 */
3147 memset(map,0,sizeof(map)); /* most characters flow through always */
3148 #ifndef __U_BOOT__
3149 mapset((uchar *)"\\$'\"`", 3); /* never flow through */
3150 mapset((uchar *)"<>;&|(){}#", 1); /* flow through if quoted */
3151 #else
3152 {
3153 uchar subst[2] = {SUBSTED_VAR_SYMBOL, 0};
3154 mapset(subst, 3); /* never flow through */
3155 }
3156 mapset((uchar *)"\\$'\"", 3); /* never flow through */
3157 mapset((uchar *)";&|#", 1); /* flow through if quoted */
3158 #endif
3159 mapset(ifs, 2); /* also flow through if quoted */
3160 }
3161
3162 /* most recursion does not come through here, the exeception is
3163 * from builtin_source() */
3164 static int parse_stream_outer(struct in_str *inp, int flag)
3165 {
3166
3167 struct p_context ctx;
3168 o_string temp=NULL_O_STRING;
3169 int rcode;
3170 #ifdef __U_BOOT__
3171 int code = 1;
3172 #endif
3173 do {
3174 ctx.type = flag;
3175 initialize_context(&ctx);
3176 update_ifs_map();
3177 if (!(flag & FLAG_PARSE_SEMICOLON) || (flag & FLAG_REPARSING)) mapset((uchar *)";$&|", 0);
3178 inp->promptmode=1;
3179 rcode = parse_stream(&temp, &ctx, inp,
3180 flag & FLAG_CONT_ON_NEWLINE ? -1 : '\n');
3181 #ifdef __U_BOOT__
3182 if (rcode == 1) flag_repeat = 0;
3183 #endif
3184 if (rcode != 1 && ctx.old_flag != 0) {
3185 syntax();
3186 #ifdef __U_BOOT__
3187 flag_repeat = 0;
3188 #endif
3189 }
3190 if (rcode != 1 && ctx.old_flag == 0) {
3191 done_word(&temp, &ctx);
3192 done_pipe(&ctx,PIPE_SEQ);
3193 #ifndef __U_BOOT__
3194 run_list(ctx.list_head);
3195 #else
3196 code = run_list(ctx.list_head);
3197 if (code == -2) { /* exit */
3198 b_free(&temp);
3199 code = 0;
3200 /* XXX hackish way to not allow exit from main loop */
3201 if (inp->peek == file_peek) {
3202 printf("exit not allowed from main input shell.\n");
3203 continue;
3204 }
3205 break;
3206 }
3207 if (code == -1)
3208 flag_repeat = 0;
3209 #endif
3210 } else {
3211 if (ctx.old_flag != 0) {
3212 free(ctx.stack);
3213 b_reset(&temp);
3214 }
3215 #ifdef __U_BOOT__
3216 if (inp->__promptme == 0) printf("<INTERRUPT>\n");
3217 inp->__promptme = 1;
3218 #endif
3219 temp.nonnull = 0;
3220 temp.quote = 0;
3221 inp->p = NULL;
3222 free_pipe_list(ctx.list_head,0);
3223 }
3224 b_free(&temp);
3225 /* loop on syntax errors, return on EOF */
3226 } while (rcode != -1 && !(flag & FLAG_EXIT_FROM_LOOP) &&
3227 (inp->peek != static_peek || b_peek(inp)));
3228 #ifndef __U_BOOT__
3229 return 0;
3230 #else
3231 return (code != 0) ? 1 : 0;
3232 #endif /* __U_BOOT__ */
3233 }
3234
3235 #ifndef __U_BOOT__
3236 static int parse_string_outer(const char *s, int flag)
3237 #else
3238 int parse_string_outer(const char *s, int flag)
3239 #endif /* __U_BOOT__ */
3240 {
3241 struct in_str input;
3242 #ifdef __U_BOOT__
3243 char *p = NULL;
3244 int rcode;
3245 if (!s)
3246 return 1;
3247 if (!*s)
3248 return 0;
3249 if (!(p = strchr(s, '\n')) || *++p) {
3250 p = xmalloc(strlen(s) + 2);
3251 strcpy(p, s);
3252 strcat(p, "\n");
3253 setup_string_in_str(&input, p);
3254 rcode = parse_stream_outer(&input, flag);
3255 free(p);
3256 return rcode;
3257 } else {
3258 #endif
3259 setup_string_in_str(&input, s);
3260 return parse_stream_outer(&input, flag);
3261 #ifdef __U_BOOT__
3262 }
3263 #endif
3264 }
3265
3266 #ifndef __U_BOOT__
3267 static int parse_file_outer(FILE *f)
3268 #else
3269 int parse_file_outer(void)
3270 #endif
3271 {
3272 int rcode;
3273 struct in_str input;
3274 #ifndef __U_BOOT__
3275 setup_file_in_str(&input, f);
3276 #else
3277 setup_file_in_str(&input);
3278 #endif
3279 rcode = parse_stream_outer(&input, FLAG_PARSE_SEMICOLON);
3280 return rcode;
3281 }
3282
3283 #ifdef __U_BOOT__
3284 #ifdef CONFIG_NEEDS_MANUAL_RELOC
3285 static void u_boot_hush_reloc(void)
3286 {
3287 unsigned long addr;
3288 struct reserved_combo *r;
3289
3290 for (r=reserved_list; r<reserved_list+NRES; r++) {
3291 addr = (ulong) (r->literal) + gd->reloc_off;
3292 r->literal = (char *)addr;
3293 }
3294 }
3295 #endif
3296
3297 int u_boot_hush_start(void)
3298 {
3299 if (top_vars == NULL) {
3300 top_vars = malloc(sizeof(struct variables));
3301 top_vars->name = "HUSH_VERSION";
3302 top_vars->value = "0.01";
3303 top_vars->next = NULL;
3304 top_vars->flg_export = 0;
3305 top_vars->flg_read_only = 1;
3306 #ifdef CONFIG_NEEDS_MANUAL_RELOC
3307 u_boot_hush_reloc();
3308 #endif
3309 }
3310 return 0;
3311 }
3312
3313 static void *xmalloc(size_t size)
3314 {
3315 void *p = NULL;
3316
3317 if (!(p = malloc(size))) {
3318 printf("ERROR : memory not allocated\n");
3319 for(;;);
3320 }
3321 return p;
3322 }
3323
3324 static void *xrealloc(void *ptr, size_t size)
3325 {
3326 void *p = NULL;
3327
3328 if (!(p = realloc(ptr, size))) {
3329 printf("ERROR : memory not allocated\n");
3330 for(;;);
3331 }
3332 return p;
3333 }
3334 #endif /* __U_BOOT__ */
3335
3336 #ifndef __U_BOOT__
3337 /* Make sure we have a controlling tty. If we get started under a job
3338 * aware app (like bash for example), make sure we are now in charge so
3339 * we don't fight over who gets the foreground */
3340 static void setup_job_control(void)
3341 {
3342 static pid_t shell_pgrp;
3343 /* Loop until we are in the foreground. */
3344 while (tcgetpgrp (shell_terminal) != (shell_pgrp = getpgrp ()))
3345 kill (- shell_pgrp, SIGTTIN);
3346
3347 /* Ignore interactive and job-control signals. */
3348 signal(SIGINT, SIG_IGN);
3349 signal(SIGQUIT, SIG_IGN);
3350 signal(SIGTERM, SIG_IGN);
3351 signal(SIGTSTP, SIG_IGN);
3352 signal(SIGTTIN, SIG_IGN);
3353 signal(SIGTTOU, SIG_IGN);
3354 signal(SIGCHLD, SIG_IGN);
3355
3356 /* Put ourselves in our own process group. */
3357 setsid();
3358 shell_pgrp = getpid ();
3359 setpgid (shell_pgrp, shell_pgrp);
3360
3361 /* Grab control of the terminal. */
3362 tcsetpgrp(shell_terminal, shell_pgrp);
3363 }
3364
3365 int hush_main(int argc, char * const *argv)
3366 {
3367 int opt;
3368 FILE *input;
3369 char **e = environ;
3370
3371 /* XXX what should these be while sourcing /etc/profile? */
3372 global_argc = argc;
3373 global_argv = argv;
3374
3375 /* (re?) initialize globals. Sometimes hush_main() ends up calling
3376 * hush_main(), therefore we cannot rely on the BSS to zero out this
3377 * stuff. Reset these to 0 every time. */
3378 ifs = NULL;
3379 /* map[] is taken care of with call to update_ifs_map() */
3380 fake_mode = 0;
3381 interactive = 0;
3382 close_me_head = NULL;
3383 last_bg_pid = 0;
3384 job_list = NULL;
3385 last_jobid = 0;
3386
3387 /* Initialize some more globals to non-zero values */
3388 set_cwd();
3389 #ifdef CONFIG_FEATURE_COMMAND_EDITING
3390 cmdedit_set_initial_prompt();
3391 #else
3392 PS1 = NULL;
3393 #endif
3394 PS2 = "> ";
3395
3396 /* initialize our shell local variables with the values
3397 * currently living in the environment */
3398 if (e) {
3399 for (; *e; e++)
3400 set_local_var(*e, 2); /* without call putenv() */
3401 }
3402
3403 last_return_code=EXIT_SUCCESS;
3404
3405
3406 if (argv[0] && argv[0][0] == '-') {
3407 debug_printf("\nsourcing /etc/profile\n");
3408 if ((input = fopen("/etc/profile", "r")) != NULL) {
3409 mark_open(fileno(input));
3410 parse_file_outer(input);
3411 mark_closed(fileno(input));
3412 fclose(input);
3413 }
3414 }
3415 input=stdin;
3416
3417 while ((opt = getopt(argc, argv, "c:xif")) > 0) {
3418 switch (opt) {
3419 case 'c':
3420 {
3421 global_argv = argv+optind;
3422 global_argc = argc-optind;
3423 opt = parse_string_outer(optarg, FLAG_PARSE_SEMICOLON);
3424 goto final_return;
3425 }
3426 break;
3427 case 'i':
3428 interactive++;
3429 break;
3430 case 'f':
3431 fake_mode++;
3432 break;
3433 default:
3434 #ifndef BB_VER
3435 fprintf(stderr, "Usage: sh [FILE]...\n"
3436 " or: sh -c command [args]...\n\n");
3437 exit(EXIT_FAILURE);
3438 #else
3439 show_usage();
3440 #endif
3441 }
3442 }
3443 /* A shell is interactive if the `-i' flag was given, or if all of
3444 * the following conditions are met:
3445 * no -c command
3446 * no arguments remaining or the -s flag given
3447 * standard input is a terminal
3448 * standard output is a terminal
3449 * Refer to Posix.2, the description of the `sh' utility. */
3450 if (argv[optind]==NULL && input==stdin &&
3451 isatty(fileno(stdin)) && isatty(fileno(stdout))) {
3452 interactive++;
3453 }
3454
3455 debug_printf("\ninteractive=%d\n", interactive);
3456 if (interactive) {
3457 /* Looks like they want an interactive shell */
3458 #ifndef CONFIG_FEATURE_SH_EXTRA_QUIET
3459 printf( "\n\n" BB_BANNER " hush - the humble shell v0.01 (testing)\n");
3460 printf( "Enter 'help' for a list of built-in commands.\n\n");
3461 #endif
3462 setup_job_control();
3463 }
3464
3465 if (argv[optind]==NULL) {
3466 opt=parse_file_outer(stdin);
3467 goto final_return;
3468 }
3469
3470 debug_printf("\nrunning script '%s'\n", argv[optind]);
3471 global_argv = argv+optind;
3472 global_argc = argc-optind;
3473 input = xfopen(argv[optind], "r");
3474 opt = parse_file_outer(input);
3475
3476 #ifdef CONFIG_FEATURE_CLEAN_UP
3477 fclose(input);
3478 if (cwd && cwd != unknown)
3479 free((char*)cwd);
3480 {
3481 struct variables *cur, *tmp;
3482 for(cur = top_vars; cur; cur = tmp) {
3483 tmp = cur->next;
3484 if (!cur->flg_read_only) {
3485 free(cur->name);
3486 free(cur->value);
3487 free(cur);
3488 }
3489 }
3490 }
3491 #endif
3492
3493 final_return:
3494 return(opt?opt:last_return_code);
3495 }
3496 #endif
3497
3498 static char *insert_var_value(char *inp)
3499 {
3500 return insert_var_value_sub(inp, 0);
3501 }
3502
3503 static char *insert_var_value_sub(char *inp, int tag_subst)
3504 {
3505 int res_str_len = 0;
3506 int len;
3507 int done = 0;
3508 char *p, *p1, *res_str = NULL;
3509
3510 while ((p = strchr(inp, SPECIAL_VAR_SYMBOL))) {
3511 /* check the beginning of the string for normal characters */
3512 if (p != inp) {
3513 /* copy any characters to the result string */
3514 len = p - inp;
3515 res_str = xrealloc(res_str, (res_str_len + len));
3516 strncpy((res_str + res_str_len), inp, len);
3517 res_str_len += len;
3518 }
3519 inp = ++p;
3520 /* find the ending marker */
3521 p = strchr(inp, SPECIAL_VAR_SYMBOL);
3522 *p = '\0';
3523 /* look up the value to substitute */
3524 if ((p1 = lookup_param(inp))) {
3525 if (tag_subst)
3526 len = res_str_len + strlen(p1) + 2;
3527 else
3528 len = res_str_len + strlen(p1);
3529 res_str = xrealloc(res_str, (1 + len));
3530 if (tag_subst) {
3531 /*
3532 * copy the variable value to the result
3533 * string
3534 */
3535 strcpy((res_str + res_str_len + 1), p1);
3536
3537 /*
3538 * mark the replaced text to be accepted as
3539 * is
3540 */
3541 res_str[res_str_len] = SUBSTED_VAR_SYMBOL;
3542 res_str[res_str_len + 1 + strlen(p1)] =
3543 SUBSTED_VAR_SYMBOL;
3544 } else
3545 /*
3546 * copy the variable value to the result
3547 * string
3548 */
3549 strcpy((res_str + res_str_len), p1);
3550
3551 res_str_len = len;
3552 }
3553 *p = SPECIAL_VAR_SYMBOL;
3554 inp = ++p;
3555 done = 1;
3556 }
3557 if (done) {
3558 res_str = xrealloc(res_str, (1 + res_str_len + strlen(inp)));
3559 strcpy((res_str + res_str_len), inp);
3560 while ((p = strchr(res_str, '\n'))) {
3561 *p = ' ';
3562 }
3563 }
3564 return (res_str == NULL) ? inp : res_str;
3565 }
3566
3567 static char **make_list_in(char **inp, char *name)
3568 {
3569 int len, i;
3570 int name_len = strlen(name);
3571 int n = 0;
3572 char **list;
3573 char *p1, *p2, *p3;
3574
3575 /* create list of variable values */
3576 list = xmalloc(sizeof(*list));
3577 for (i = 0; inp[i]; i++) {
3578 p3 = insert_var_value(inp[i]);
3579 p1 = p3;
3580 while (*p1) {
3581 if (*p1 == ' ') {
3582 p1++;
3583 continue;
3584 }
3585 if ((p2 = strchr(p1, ' '))) {
3586 len = p2 - p1;
3587 } else {
3588 len = strlen(p1);
3589 p2 = p1 + len;
3590 }
3591 /* we use n + 2 in realloc for list,because we add
3592 * new element and then we will add NULL element */
3593 list = xrealloc(list, sizeof(*list) * (n + 2));
3594 list[n] = xmalloc(2 + name_len + len);
3595 strcpy(list[n], name);
3596 strcat(list[n], "=");
3597 strncat(list[n], p1, len);
3598 list[n++][name_len + len + 1] = '\0';
3599 p1 = p2;
3600 }
3601 if (p3 != inp[i]) free(p3);
3602 }
3603 list[n] = NULL;
3604 return list;
3605 }
3606
3607 /*
3608 * Make new string for parser
3609 * inp - array of argument strings to flatten
3610 * nonnull - indicates argument was quoted when originally parsed
3611 */
3612 static char *make_string(char **inp, int *nonnull)
3613 {
3614 char *p;
3615 char *str = NULL;
3616 int n;
3617 int len = 2;
3618 char *noeval_str;
3619 int noeval = 0;
3620
3621 noeval_str = get_local_var("HUSH_NO_EVAL");
3622 if (noeval_str != NULL && *noeval_str != '0' && *noeval_str != '\0')
3623 noeval = 1;
3624 for (n = 0; inp[n]; n++) {
3625 p = insert_var_value_sub(inp[n], noeval);
3626 str = xrealloc(str, (len + strlen(p) + (2 * nonnull[n])));
3627 if (n) {
3628 strcat(str, " ");
3629 } else {
3630 *str = '\0';
3631 }
3632 if (nonnull[n])
3633 strcat(str, "'");
3634 strcat(str, p);
3635 if (nonnull[n])
3636 strcat(str, "'");
3637 len = strlen(str) + 3;
3638 if (p != inp[n]) free(p);
3639 }
3640 len = strlen(str);
3641 *(str + len) = '\n';
3642 *(str + len + 1) = '\0';
3643 return str;
3644 }
3645
3646 #ifdef __U_BOOT__
3647 static int do_showvar(cmd_tbl_t *cmdtp, int flag, int argc,
3648 char * const argv[])
3649 {
3650 int i, k;
3651 int rcode = 0;
3652 struct variables *cur;
3653
3654 if (argc == 1) { /* Print all env variables */
3655 for (cur = top_vars; cur; cur = cur->next) {
3656 printf ("%s=%s\n", cur->name, cur->value);
3657 if (ctrlc ()) {
3658 puts ("\n ** Abort\n");
3659 return 1;
3660 }
3661 }
3662 return 0;
3663 }
3664 for (i = 1; i < argc; ++i) { /* print single env variables */
3665 char *name = argv[i];
3666
3667 k = -1;
3668 for (cur = top_vars; cur; cur = cur->next) {
3669 if(strcmp (cur->name, name) == 0) {
3670 k = 0;
3671 printf ("%s=%s\n", cur->name, cur->value);
3672 }
3673 if (ctrlc ()) {
3674 puts ("\n ** Abort\n");
3675 return 1;
3676 }
3677 }
3678 if (k < 0) {
3679 printf ("## Error: \"%s\" not defined\n", name);
3680 rcode ++;
3681 }
3682 }
3683 return rcode;
3684 }
3685
3686 U_BOOT_CMD(
3687 showvar, CONFIG_SYS_MAXARGS, 1, do_showvar,
3688 "print local hushshell variables",
3689 "\n - print values of all hushshell variables\n"
3690 "showvar name ...\n"
3691 " - print value of hushshell variable 'name'"
3692 );
3693
3694 #endif
3695 /****************************************************************************/
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