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[thirdparty/u-boot.git] / common / cli_hush.c
1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * sh.c -- a prototype Bourne shell grammar parser
4 * Intended to follow the original Thompson and Ritchie
5 * "small and simple is beautiful" philosophy, which
6 * incidentally is a good match to today's BusyBox.
7 *
8 * Copyright (C) 2000,2001 Larry Doolittle <larry@doolittle.boa.org>
9 *
10 * Credits:
11 * The parser routines proper are all original material, first
12 * written Dec 2000 and Jan 2001 by Larry Doolittle.
13 * The execution engine, the builtins, and much of the underlying
14 * support has been adapted from busybox-0.49pre's lash,
15 * which is Copyright (C) 2000 by Lineo, Inc., and
16 * written by Erik Andersen <andersen@lineo.com>, <andersee@debian.org>.
17 * That, in turn, is based in part on ladsh.c, by Michael K. Johnson and
18 * Erik W. Troan, which they placed in the public domain. I don't know
19 * how much of the Johnson/Troan code has survived the repeated rewrites.
20 * Other credits:
21 * b_addchr() derived from similar w_addchar function in glibc-2.2
22 * setup_redirect(), redirect_opt_num(), and big chunks of main()
23 * and many builtins derived from contributions by Erik Andersen
24 * miscellaneous bugfixes from Matt Kraai
25 *
26 * There are two big (and related) architecture differences between
27 * this parser and the lash parser. One is that this version is
28 * actually designed from the ground up to understand nearly all
29 * of the Bourne grammar. The second, consequential change is that
30 * the parser and input reader have been turned inside out. Now,
31 * the parser is in control, and asks for input as needed. The old
32 * way had the input reader in control, and it asked for parsing to
33 * take place as needed. The new way makes it much easier to properly
34 * handle the recursion implicit in the various substitutions, especially
35 * across continuation lines.
36 *
37 * Bash grammar not implemented: (how many of these were in original sh?)
38 * $@ (those sure look like weird quoting rules)
39 * $_
40 * ! negation operator for pipes
41 * &> and >& redirection of stdout+stderr
42 * Brace Expansion
43 * Tilde Expansion
44 * fancy forms of Parameter Expansion
45 * aliases
46 * Arithmetic Expansion
47 * <(list) and >(list) Process Substitution
48 * reserved words: case, esac, select, function
49 * Here Documents ( << word )
50 * Functions
51 * Major bugs:
52 * job handling woefully incomplete and buggy
53 * reserved word execution woefully incomplete and buggy
54 * to-do:
55 * port selected bugfixes from post-0.49 busybox lash - done?
56 * finish implementing reserved words: for, while, until, do, done
57 * change { and } from special chars to reserved words
58 * builtins: break, continue, eval, return, set, trap, ulimit
59 * test magic exec
60 * handle children going into background
61 * clean up recognition of null pipes
62 * check setting of global_argc and global_argv
63 * control-C handling, probably with longjmp
64 * follow IFS rules more precisely, including update semantics
65 * figure out what to do with backslash-newline
66 * explain why we use signal instead of sigaction
67 * propagate syntax errors, die on resource errors?
68 * continuation lines, both explicit and implicit - done?
69 * memory leak finding and plugging - done?
70 * more testing, especially quoting rules and redirection
71 * document how quoting rules not precisely followed for variable assignments
72 * maybe change map[] to use 2-bit entries
73 * (eventually) remove all the printf's
74 */
75
76 #define __U_BOOT__
77 #ifdef __U_BOOT__
78 #include <malloc.h> /* malloc, free, realloc*/
79 #include <linux/ctype.h> /* isalpha, isdigit */
80 #include <common.h> /* readline */
81 #include <console.h>
82 #include <bootretry.h>
83 #include <cli.h>
84 #include <cli_hush.h>
85 #include <command.h> /* find_cmd */
86 #ifndef CONFIG_SYS_PROMPT_HUSH_PS2
87 #define CONFIG_SYS_PROMPT_HUSH_PS2 "> "
88 #endif
89 #endif
90 #ifndef __U_BOOT__
91 #include <ctype.h> /* isalpha, isdigit */
92 #include <unistd.h> /* getpid */
93 #include <stdlib.h> /* getenv, atoi */
94 #include <string.h> /* strchr */
95 #include <stdio.h> /* popen etc. */
96 #include <glob.h> /* glob, of course */
97 #include <stdarg.h> /* va_list */
98 #include <errno.h>
99 #include <fcntl.h>
100 #include <getopt.h> /* should be pretty obvious */
101
102 #include <sys/stat.h> /* ulimit */
103 #include <sys/types.h>
104 #include <sys/wait.h>
105 #include <signal.h>
106
107 /* #include <dmalloc.h> */
108
109 #if 1
110 #include "busybox.h"
111 #include "cmdedit.h"
112 #else
113 #define applet_name "hush"
114 #include "standalone.h"
115 #define hush_main main
116 #undef CONFIG_FEATURE_SH_FANCY_PROMPT
117 #define BB_BANNER
118 #endif
119 #endif
120 #define SPECIAL_VAR_SYMBOL 03
121 #define SUBSTED_VAR_SYMBOL 04
122 #ifndef __U_BOOT__
123 #define FLAG_EXIT_FROM_LOOP 1
124 #define FLAG_PARSE_SEMICOLON (1 << 1) /* symbol ';' is special for parser */
125 #define FLAG_REPARSING (1 << 2) /* >= 2nd pass */
126
127 #endif
128
129 #ifdef __U_BOOT__
130 DECLARE_GLOBAL_DATA_PTR;
131
132 #define EXIT_SUCCESS 0
133 #define EOF -1
134 #define syntax() syntax_err()
135 #define xstrdup strdup
136 #define error_msg printf
137 #else
138 typedef enum {
139 REDIRECT_INPUT = 1,
140 REDIRECT_OVERWRITE = 2,
141 REDIRECT_APPEND = 3,
142 REDIRECT_HEREIS = 4,
143 REDIRECT_IO = 5
144 } redir_type;
145
146 /* The descrip member of this structure is only used to make debugging
147 * output pretty */
148 struct {int mode; int default_fd; char *descrip;} redir_table[] = {
149 { 0, 0, "()" },
150 { O_RDONLY, 0, "<" },
151 { O_CREAT|O_TRUNC|O_WRONLY, 1, ">" },
152 { O_CREAT|O_APPEND|O_WRONLY, 1, ">>" },
153 { O_RDONLY, -1, "<<" },
154 { O_RDWR, 1, "<>" }
155 };
156 #endif
157
158 typedef enum {
159 PIPE_SEQ = 1,
160 PIPE_AND = 2,
161 PIPE_OR = 3,
162 PIPE_BG = 4,
163 } pipe_style;
164
165 /* might eventually control execution */
166 typedef enum {
167 RES_NONE = 0,
168 RES_IF = 1,
169 RES_THEN = 2,
170 RES_ELIF = 3,
171 RES_ELSE = 4,
172 RES_FI = 5,
173 RES_FOR = 6,
174 RES_WHILE = 7,
175 RES_UNTIL = 8,
176 RES_DO = 9,
177 RES_DONE = 10,
178 RES_XXXX = 11,
179 RES_IN = 12,
180 RES_SNTX = 13
181 } reserved_style;
182 #define FLAG_END (1<<RES_NONE)
183 #define FLAG_IF (1<<RES_IF)
184 #define FLAG_THEN (1<<RES_THEN)
185 #define FLAG_ELIF (1<<RES_ELIF)
186 #define FLAG_ELSE (1<<RES_ELSE)
187 #define FLAG_FI (1<<RES_FI)
188 #define FLAG_FOR (1<<RES_FOR)
189 #define FLAG_WHILE (1<<RES_WHILE)
190 #define FLAG_UNTIL (1<<RES_UNTIL)
191 #define FLAG_DO (1<<RES_DO)
192 #define FLAG_DONE (1<<RES_DONE)
193 #define FLAG_IN (1<<RES_IN)
194 #define FLAG_START (1<<RES_XXXX)
195
196 /* This holds pointers to the various results of parsing */
197 struct p_context {
198 struct child_prog *child;
199 struct pipe *list_head;
200 struct pipe *pipe;
201 #ifndef __U_BOOT__
202 struct redir_struct *pending_redirect;
203 #endif
204 reserved_style w;
205 int old_flag; /* for figuring out valid reserved words */
206 struct p_context *stack;
207 int type; /* define type of parser : ";$" common or special symbol */
208 /* How about quoting status? */
209 };
210
211 #ifndef __U_BOOT__
212 struct redir_struct {
213 redir_type type; /* type of redirection */
214 int fd; /* file descriptor being redirected */
215 int dup; /* -1, or file descriptor being duplicated */
216 struct redir_struct *next; /* pointer to the next redirect in the list */
217 glob_t word; /* *word.gl_pathv is the filename */
218 };
219 #endif
220
221 struct child_prog {
222 #ifndef __U_BOOT__
223 pid_t pid; /* 0 if exited */
224 #endif
225 char **argv; /* program name and arguments */
226 /* was quoted when parsed; copy of struct o_string.nonnull field */
227 int *argv_nonnull;
228 #ifdef __U_BOOT__
229 int argc; /* number of program arguments */
230 #endif
231 struct pipe *group; /* if non-NULL, first in group or subshell */
232 #ifndef __U_BOOT__
233 int subshell; /* flag, non-zero if group must be forked */
234 struct redir_struct *redirects; /* I/O redirections */
235 glob_t glob_result; /* result of parameter globbing */
236 int is_stopped; /* is the program currently running? */
237 struct pipe *family; /* pointer back to the child's parent pipe */
238 #endif
239 int sp; /* number of SPECIAL_VAR_SYMBOL */
240 int type;
241 };
242
243 struct pipe {
244 #ifndef __U_BOOT__
245 int jobid; /* job number */
246 #endif
247 int num_progs; /* total number of programs in job */
248 #ifndef __U_BOOT__
249 int running_progs; /* number of programs running */
250 char *text; /* name of job */
251 char *cmdbuf; /* buffer various argv's point into */
252 pid_t pgrp; /* process group ID for the job */
253 #endif
254 struct child_prog *progs; /* array of commands in pipe */
255 struct pipe *next; /* to track background commands */
256 #ifndef __U_BOOT__
257 int stopped_progs; /* number of programs alive, but stopped */
258 int job_context; /* bitmask defining current context */
259 #endif
260 pipe_style followup; /* PIPE_BG, PIPE_SEQ, PIPE_OR, PIPE_AND */
261 reserved_style r_mode; /* supports if, for, while, until */
262 };
263
264 #ifndef __U_BOOT__
265 struct close_me {
266 int fd;
267 struct close_me *next;
268 };
269 #endif
270
271 struct variables {
272 char *name;
273 char *value;
274 int flg_export;
275 int flg_read_only;
276 struct variables *next;
277 };
278
279 /* globals, connect us to the outside world
280 * the first three support $?, $#, and $1 */
281 #ifndef __U_BOOT__
282 char **global_argv;
283 unsigned int global_argc;
284 #endif
285 static unsigned int last_return_code;
286 #ifndef __U_BOOT__
287 extern char **environ; /* This is in <unistd.h>, but protected with __USE_GNU */
288 #endif
289
290 /* "globals" within this file */
291 static uchar *ifs;
292 static char map[256];
293 #ifndef __U_BOOT__
294 static int fake_mode;
295 static int interactive;
296 static struct close_me *close_me_head;
297 static const char *cwd;
298 static struct pipe *job_list;
299 static unsigned int last_bg_pid;
300 static unsigned int last_jobid;
301 static unsigned int shell_terminal;
302 static char *PS1;
303 static char *PS2;
304 struct variables shell_ver = { "HUSH_VERSION", "0.01", 1, 1, 0 };
305 struct variables *top_vars = &shell_ver;
306 #else
307 static int flag_repeat = 0;
308 static int do_repeat = 0;
309 static struct variables *top_vars = NULL ;
310 #endif /*__U_BOOT__ */
311
312 #define B_CHUNK (100)
313 #define B_NOSPAC 1
314
315 typedef struct {
316 char *data;
317 int length;
318 int maxlen;
319 int quote;
320 int nonnull;
321 } o_string;
322 #define NULL_O_STRING {NULL,0,0,0,0}
323 /* used for initialization:
324 o_string foo = NULL_O_STRING; */
325
326 /* I can almost use ordinary FILE *. Is open_memstream() universally
327 * available? Where is it documented? */
328 struct in_str {
329 const char *p;
330 #ifndef __U_BOOT__
331 char peek_buf[2];
332 #endif
333 int __promptme;
334 int promptmode;
335 #ifndef __U_BOOT__
336 FILE *file;
337 #endif
338 int (*get) (struct in_str *);
339 int (*peek) (struct in_str *);
340 };
341 #define b_getch(input) ((input)->get(input))
342 #define b_peek(input) ((input)->peek(input))
343
344 #ifndef __U_BOOT__
345 #define JOB_STATUS_FORMAT "[%d] %-22s %.40s\n"
346
347 struct built_in_command {
348 char *cmd; /* name */
349 char *descr; /* description */
350 int (*function) (struct child_prog *); /* function ptr */
351 };
352 #endif
353
354 /* define DEBUG_SHELL for debugging output (obviously ;-)) */
355 #if 0
356 #define DEBUG_SHELL
357 #endif
358
359 /* This should be in utility.c */
360 #ifdef DEBUG_SHELL
361 #ifndef __U_BOOT__
362 static void debug_printf(const char *format, ...)
363 {
364 va_list args;
365 va_start(args, format);
366 vfprintf(stderr, format, args);
367 va_end(args);
368 }
369 #else
370 #define debug_printf(fmt,args...) printf (fmt ,##args)
371 #endif
372 #else
373 static inline void debug_printf(const char *format, ...) { }
374 #endif
375 #define final_printf debug_printf
376
377 #ifdef __U_BOOT__
378 static void syntax_err(void) {
379 printf("syntax error\n");
380 }
381 #else
382 static void __syntax(char *file, int line) {
383 error_msg("syntax error %s:%d", file, line);
384 }
385 #define syntax() __syntax(__FILE__, __LINE__)
386 #endif
387
388 #ifdef __U_BOOT__
389 static void *xmalloc(size_t size);
390 static void *xrealloc(void *ptr, size_t size);
391 #else
392 /* Index of subroutines: */
393 /* function prototypes for builtins */
394 static int builtin_cd(struct child_prog *child);
395 static int builtin_env(struct child_prog *child);
396 static int builtin_eval(struct child_prog *child);
397 static int builtin_exec(struct child_prog *child);
398 static int builtin_exit(struct child_prog *child);
399 static int builtin_export(struct child_prog *child);
400 static int builtin_fg_bg(struct child_prog *child);
401 static int builtin_help(struct child_prog *child);
402 static int builtin_jobs(struct child_prog *child);
403 static int builtin_pwd(struct child_prog *child);
404 static int builtin_read(struct child_prog *child);
405 static int builtin_set(struct child_prog *child);
406 static int builtin_shift(struct child_prog *child);
407 static int builtin_source(struct child_prog *child);
408 static int builtin_umask(struct child_prog *child);
409 static int builtin_unset(struct child_prog *child);
410 static int builtin_not_written(struct child_prog *child);
411 #endif
412 /* o_string manipulation: */
413 static int b_check_space(o_string *o, int len);
414 static int b_addchr(o_string *o, int ch);
415 static void b_reset(o_string *o);
416 static int b_addqchr(o_string *o, int ch, int quote);
417 #ifndef __U_BOOT__
418 static int b_adduint(o_string *o, unsigned int i);
419 #endif
420 /* in_str manipulations: */
421 static int static_get(struct in_str *i);
422 static int static_peek(struct in_str *i);
423 static int file_get(struct in_str *i);
424 static int file_peek(struct in_str *i);
425 #ifndef __U_BOOT__
426 static void setup_file_in_str(struct in_str *i, FILE *f);
427 #else
428 static void setup_file_in_str(struct in_str *i);
429 #endif
430 static void setup_string_in_str(struct in_str *i, const char *s);
431 #ifndef __U_BOOT__
432 /* close_me manipulations: */
433 static void mark_open(int fd);
434 static void mark_closed(int fd);
435 static void close_all(void);
436 #endif
437 /* "run" the final data structures: */
438 static char *indenter(int i);
439 static int free_pipe_list(struct pipe *head, int indent);
440 static int free_pipe(struct pipe *pi, int indent);
441 /* really run the final data structures: */
442 #ifndef __U_BOOT__
443 static int setup_redirects(struct child_prog *prog, int squirrel[]);
444 #endif
445 static int run_list_real(struct pipe *pi);
446 #ifndef __U_BOOT__
447 static void pseudo_exec(struct child_prog *child) __attribute__ ((noreturn));
448 #endif
449 static int run_pipe_real(struct pipe *pi);
450 /* extended glob support: */
451 #ifndef __U_BOOT__
452 static int globhack(const char *src, int flags, glob_t *pglob);
453 static int glob_needed(const char *s);
454 static int xglob(o_string *dest, int flags, glob_t *pglob);
455 #endif
456 /* variable assignment: */
457 static int is_assignment(const char *s);
458 /* data structure manipulation: */
459 #ifndef __U_BOOT__
460 static int setup_redirect(struct p_context *ctx, int fd, redir_type style, struct in_str *input);
461 #endif
462 static void initialize_context(struct p_context *ctx);
463 static int done_word(o_string *dest, struct p_context *ctx);
464 static int done_command(struct p_context *ctx);
465 static int done_pipe(struct p_context *ctx, pipe_style type);
466 /* primary string parsing: */
467 #ifndef __U_BOOT__
468 static int redirect_dup_num(struct in_str *input);
469 static int redirect_opt_num(o_string *o);
470 static int process_command_subs(o_string *dest, struct p_context *ctx, struct in_str *input, int subst_end);
471 static int parse_group(o_string *dest, struct p_context *ctx, struct in_str *input, int ch);
472 #endif
473 static char *lookup_param(char *src);
474 static char *make_string(char **inp, int *nonnull);
475 static int handle_dollar(o_string *dest, struct p_context *ctx, struct in_str *input);
476 #ifndef __U_BOOT__
477 static int parse_string(o_string *dest, struct p_context *ctx, const char *src);
478 #endif
479 static int parse_stream(o_string *dest, struct p_context *ctx, struct in_str *input0, int end_trigger);
480 /* setup: */
481 static int parse_stream_outer(struct in_str *inp, int flag);
482 #ifndef __U_BOOT__
483 static int parse_string_outer(const char *s, int flag);
484 static int parse_file_outer(FILE *f);
485 #endif
486 #ifndef __U_BOOT__
487 /* job management: */
488 static int checkjobs(struct pipe* fg_pipe);
489 static void insert_bg_job(struct pipe *pi);
490 static void remove_bg_job(struct pipe *pi);
491 #endif
492 /* local variable support */
493 static char **make_list_in(char **inp, char *name);
494 static char *insert_var_value(char *inp);
495 static char *insert_var_value_sub(char *inp, int tag_subst);
496
497 #ifndef __U_BOOT__
498 /* Table of built-in functions. They can be forked or not, depending on
499 * context: within pipes, they fork. As simple commands, they do not.
500 * When used in non-forking context, they can change global variables
501 * in the parent shell process. If forked, of course they can not.
502 * For example, 'unset foo | whatever' will parse and run, but foo will
503 * still be set at the end. */
504 static struct built_in_command bltins[] = {
505 {"bg", "Resume a job in the background", builtin_fg_bg},
506 {"break", "Exit for, while or until loop", builtin_not_written},
507 {"cd", "Change working directory", builtin_cd},
508 {"continue", "Continue for, while or until loop", builtin_not_written},
509 {"env", "Print all environment variables", builtin_env},
510 {"eval", "Construct and run shell command", builtin_eval},
511 {"exec", "Exec command, replacing this shell with the exec'd process",
512 builtin_exec},
513 {"exit", "Exit from shell()", builtin_exit},
514 {"export", "Set environment variable", builtin_export},
515 {"fg", "Bring job into the foreground", builtin_fg_bg},
516 {"jobs", "Lists the active jobs", builtin_jobs},
517 {"pwd", "Print current directory", builtin_pwd},
518 {"read", "Input environment variable", builtin_read},
519 {"return", "Return from a function", builtin_not_written},
520 {"set", "Set/unset shell local variables", builtin_set},
521 {"shift", "Shift positional parameters", builtin_shift},
522 {"trap", "Trap signals", builtin_not_written},
523 {"ulimit","Controls resource limits", builtin_not_written},
524 {"umask","Sets file creation mask", builtin_umask},
525 {"unset", "Unset environment variable", builtin_unset},
526 {".", "Source-in and run commands in a file", builtin_source},
527 {"help", "List shell built-in commands", builtin_help},
528 {NULL, NULL, NULL}
529 };
530
531 static const char *set_cwd(void)
532 {
533 if(cwd==unknown)
534 cwd = NULL; /* xgetcwd(arg) called free(arg) */
535 cwd = xgetcwd((char *)cwd);
536 if (!cwd)
537 cwd = unknown;
538 return cwd;
539 }
540
541 /* built-in 'eval' handler */
542 static int builtin_eval(struct child_prog *child)
543 {
544 char *str = NULL;
545 int rcode = EXIT_SUCCESS;
546
547 if (child->argv[1]) {
548 str = make_string(child->argv + 1);
549 parse_string_outer(str, FLAG_EXIT_FROM_LOOP |
550 FLAG_PARSE_SEMICOLON);
551 free(str);
552 rcode = last_return_code;
553 }
554 return rcode;
555 }
556
557 /* built-in 'cd <path>' handler */
558 static int builtin_cd(struct child_prog *child)
559 {
560 char *newdir;
561 if (child->argv[1] == NULL)
562 newdir = env_get("HOME");
563 else
564 newdir = child->argv[1];
565 if (chdir(newdir)) {
566 printf("cd: %s: %s\n", newdir, strerror(errno));
567 return EXIT_FAILURE;
568 }
569 set_cwd();
570 return EXIT_SUCCESS;
571 }
572
573 /* built-in 'env' handler */
574 static int builtin_env(struct child_prog *dummy)
575 {
576 char **e = environ;
577 if (e == NULL) return EXIT_FAILURE;
578 for (; *e; e++) {
579 puts(*e);
580 }
581 return EXIT_SUCCESS;
582 }
583
584 /* built-in 'exec' handler */
585 static int builtin_exec(struct child_prog *child)
586 {
587 if (child->argv[1] == NULL)
588 return EXIT_SUCCESS; /* Really? */
589 child->argv++;
590 pseudo_exec(child);
591 /* never returns */
592 }
593
594 /* built-in 'exit' handler */
595 static int builtin_exit(struct child_prog *child)
596 {
597 if (child->argv[1] == NULL)
598 exit(last_return_code);
599 exit (atoi(child->argv[1]));
600 }
601
602 /* built-in 'export VAR=value' handler */
603 static int builtin_export(struct child_prog *child)
604 {
605 int res = 0;
606 char *name = child->argv[1];
607
608 if (name == NULL) {
609 return (builtin_env(child));
610 }
611
612 name = strdup(name);
613
614 if(name) {
615 char *value = strchr(name, '=');
616
617 if (!value) {
618 char *tmp;
619 /* They are exporting something without an =VALUE */
620
621 value = get_local_var(name);
622 if (value) {
623 size_t ln = strlen(name);
624
625 tmp = realloc(name, ln+strlen(value)+2);
626 if(tmp==NULL)
627 res = -1;
628 else {
629 sprintf(tmp+ln, "=%s", value);
630 name = tmp;
631 }
632 } else {
633 /* bash does not return an error when trying to export
634 * an undefined variable. Do likewise. */
635 res = 1;
636 }
637 }
638 }
639 if (res<0)
640 perror_msg("export");
641 else if(res==0)
642 res = set_local_var(name, 1);
643 else
644 res = 0;
645 free(name);
646 return res;
647 }
648
649 /* built-in 'fg' and 'bg' handler */
650 static int builtin_fg_bg(struct child_prog *child)
651 {
652 int i, jobnum;
653 struct pipe *pi=NULL;
654
655 if (!interactive)
656 return EXIT_FAILURE;
657 /* If they gave us no args, assume they want the last backgrounded task */
658 if (!child->argv[1]) {
659 for (pi = job_list; pi; pi = pi->next) {
660 if (pi->jobid == last_jobid) {
661 break;
662 }
663 }
664 if (!pi) {
665 error_msg("%s: no current job", child->argv[0]);
666 return EXIT_FAILURE;
667 }
668 } else {
669 if (sscanf(child->argv[1], "%%%d", &jobnum) != 1) {
670 error_msg("%s: bad argument '%s'", child->argv[0], child->argv[1]);
671 return EXIT_FAILURE;
672 }
673 for (pi = job_list; pi; pi = pi->next) {
674 if (pi->jobid == jobnum) {
675 break;
676 }
677 }
678 if (!pi) {
679 error_msg("%s: %d: no such job", child->argv[0], jobnum);
680 return EXIT_FAILURE;
681 }
682 }
683
684 if (*child->argv[0] == 'f') {
685 /* Put the job into the foreground. */
686 tcsetpgrp(shell_terminal, pi->pgrp);
687 }
688
689 /* Restart the processes in the job */
690 for (i = 0; i < pi->num_progs; i++)
691 pi->progs[i].is_stopped = 0;
692
693 if ( (i=kill(- pi->pgrp, SIGCONT)) < 0) {
694 if (i == ESRCH) {
695 remove_bg_job(pi);
696 } else {
697 perror_msg("kill (SIGCONT)");
698 }
699 }
700
701 pi->stopped_progs = 0;
702 return EXIT_SUCCESS;
703 }
704
705 /* built-in 'help' handler */
706 static int builtin_help(struct child_prog *dummy)
707 {
708 struct built_in_command *x;
709
710 printf("\nBuilt-in commands:\n");
711 printf("-------------------\n");
712 for (x = bltins; x->cmd; x++) {
713 if (x->descr==NULL)
714 continue;
715 printf("%s\t%s\n", x->cmd, x->descr);
716 }
717 printf("\n\n");
718 return EXIT_SUCCESS;
719 }
720
721 /* built-in 'jobs' handler */
722 static int builtin_jobs(struct child_prog *child)
723 {
724 struct pipe *job;
725 char *status_string;
726
727 for (job = job_list; job; job = job->next) {
728 if (job->running_progs == job->stopped_progs)
729 status_string = "Stopped";
730 else
731 status_string = "Running";
732
733 printf(JOB_STATUS_FORMAT, job->jobid, status_string, job->text);
734 }
735 return EXIT_SUCCESS;
736 }
737
738
739 /* built-in 'pwd' handler */
740 static int builtin_pwd(struct child_prog *dummy)
741 {
742 puts(set_cwd());
743 return EXIT_SUCCESS;
744 }
745
746 /* built-in 'read VAR' handler */
747 static int builtin_read(struct child_prog *child)
748 {
749 int res;
750
751 if (child->argv[1]) {
752 char string[BUFSIZ];
753 char *var = 0;
754
755 string[0] = 0; /* In case stdin has only EOF */
756 /* read string */
757 fgets(string, sizeof(string), stdin);
758 chomp(string);
759 var = malloc(strlen(child->argv[1])+strlen(string)+2);
760 if(var) {
761 sprintf(var, "%s=%s", child->argv[1], string);
762 res = set_local_var(var, 0);
763 } else
764 res = -1;
765 if (res)
766 fprintf(stderr, "read: %m\n");
767 free(var); /* So not move up to avoid breaking errno */
768 return res;
769 } else {
770 do res=getchar(); while(res!='\n' && res!=EOF);
771 return 0;
772 }
773 }
774
775 /* built-in 'set VAR=value' handler */
776 static int builtin_set(struct child_prog *child)
777 {
778 char *temp = child->argv[1];
779 struct variables *e;
780
781 if (temp == NULL)
782 for(e = top_vars; e; e=e->next)
783 printf("%s=%s\n", e->name, e->value);
784 else
785 set_local_var(temp, 0);
786
787 return EXIT_SUCCESS;
788 }
789
790
791 /* Built-in 'shift' handler */
792 static int builtin_shift(struct child_prog *child)
793 {
794 int n=1;
795 if (child->argv[1]) {
796 n=atoi(child->argv[1]);
797 }
798 if (n>=0 && n<global_argc) {
799 /* XXX This probably breaks $0 */
800 global_argc -= n;
801 global_argv += n;
802 return EXIT_SUCCESS;
803 } else {
804 return EXIT_FAILURE;
805 }
806 }
807
808 /* Built-in '.' handler (read-in and execute commands from file) */
809 static int builtin_source(struct child_prog *child)
810 {
811 FILE *input;
812 int status;
813
814 if (child->argv[1] == NULL)
815 return EXIT_FAILURE;
816
817 /* XXX search through $PATH is missing */
818 input = fopen(child->argv[1], "r");
819 if (!input) {
820 error_msg("Couldn't open file '%s'", child->argv[1]);
821 return EXIT_FAILURE;
822 }
823
824 /* Now run the file */
825 /* XXX argv and argc are broken; need to save old global_argv
826 * (pointer only is OK!) on this stack frame,
827 * set global_argv=child->argv+1, recurse, and restore. */
828 mark_open(fileno(input));
829 status = parse_file_outer(input);
830 mark_closed(fileno(input));
831 fclose(input);
832 return (status);
833 }
834
835 static int builtin_umask(struct child_prog *child)
836 {
837 mode_t new_umask;
838 const char *arg = child->argv[1];
839 char *end;
840 if (arg) {
841 new_umask=strtoul(arg, &end, 8);
842 if (*end!='\0' || end == arg) {
843 return EXIT_FAILURE;
844 }
845 } else {
846 printf("%.3o\n", (unsigned int) (new_umask=umask(0)));
847 }
848 umask(new_umask);
849 return EXIT_SUCCESS;
850 }
851
852 /* built-in 'unset VAR' handler */
853 static int builtin_unset(struct child_prog *child)
854 {
855 /* bash returned already true */
856 unset_local_var(child->argv[1]);
857 return EXIT_SUCCESS;
858 }
859
860 static int builtin_not_written(struct child_prog *child)
861 {
862 printf("builtin_%s not written\n",child->argv[0]);
863 return EXIT_FAILURE;
864 }
865 #endif
866
867 static int b_check_space(o_string *o, int len)
868 {
869 /* It would be easy to drop a more restrictive policy
870 * in here, such as setting a maximum string length */
871 if (o->length + len > o->maxlen) {
872 char *old_data = o->data;
873 /* assert (data == NULL || o->maxlen != 0); */
874 o->maxlen += max(2*len, B_CHUNK);
875 o->data = realloc(o->data, 1 + o->maxlen);
876 if (o->data == NULL) {
877 free(old_data);
878 }
879 }
880 return o->data == NULL;
881 }
882
883 static int b_addchr(o_string *o, int ch)
884 {
885 debug_printf("b_addchr: %c %d %p\n", ch, o->length, o);
886 if (b_check_space(o, 1)) return B_NOSPAC;
887 o->data[o->length] = ch;
888 o->length++;
889 o->data[o->length] = '\0';
890 return 0;
891 }
892
893 static void b_reset(o_string *o)
894 {
895 o->length = 0;
896 o->nonnull = 0;
897 if (o->data != NULL) *o->data = '\0';
898 }
899
900 static void b_free(o_string *o)
901 {
902 b_reset(o);
903 free(o->data);
904 o->data = NULL;
905 o->maxlen = 0;
906 }
907
908 /* My analysis of quoting semantics tells me that state information
909 * is associated with a destination, not a source.
910 */
911 static int b_addqchr(o_string *o, int ch, int quote)
912 {
913 if (quote && strchr("*?[\\",ch)) {
914 int rc;
915 rc = b_addchr(o, '\\');
916 if (rc) return rc;
917 }
918 return b_addchr(o, ch);
919 }
920
921 #ifndef __U_BOOT__
922 static int b_adduint(o_string *o, unsigned int i)
923 {
924 int r;
925 char *p = simple_itoa(i);
926 /* no escape checking necessary */
927 do r=b_addchr(o, *p++); while (r==0 && *p);
928 return r;
929 }
930 #endif
931
932 static int static_get(struct in_str *i)
933 {
934 int ch = *i->p++;
935 if (ch=='\0') return EOF;
936 return ch;
937 }
938
939 static int static_peek(struct in_str *i)
940 {
941 return *i->p;
942 }
943
944 #ifndef __U_BOOT__
945 static inline void cmdedit_set_initial_prompt(void)
946 {
947 #ifndef CONFIG_FEATURE_SH_FANCY_PROMPT
948 PS1 = NULL;
949 #else
950 PS1 = env_get("PS1");
951 if(PS1==0)
952 PS1 = "\\w \\$ ";
953 #endif
954 }
955
956 static inline void setup_prompt_string(int promptmode, char **prompt_str)
957 {
958 debug_printf("setup_prompt_string %d ",promptmode);
959 #ifndef CONFIG_FEATURE_SH_FANCY_PROMPT
960 /* Set up the prompt */
961 if (promptmode == 1) {
962 free(PS1);
963 PS1=xmalloc(strlen(cwd)+4);
964 sprintf(PS1, "%s %s", cwd, ( geteuid() != 0 ) ? "$ ":"# ");
965 *prompt_str = PS1;
966 } else {
967 *prompt_str = PS2;
968 }
969 #else
970 *prompt_str = (promptmode==1)? PS1 : PS2;
971 #endif
972 debug_printf("result %s\n",*prompt_str);
973 }
974 #endif
975
976 #ifdef __U_BOOT__
977 static int uboot_cli_readline(struct in_str *i)
978 {
979 char *prompt;
980 char __maybe_unused *ps_prompt = NULL;
981
982 if (i->promptmode == 1)
983 prompt = CONFIG_SYS_PROMPT;
984 else
985 prompt = CONFIG_SYS_PROMPT_HUSH_PS2;
986
987 #ifdef CONFIG_CMDLINE_PS_SUPPORT
988 if (i->promptmode == 1)
989 ps_prompt = env_get("PS1");
990 else
991 ps_prompt = env_get("PS2");
992 if (ps_prompt)
993 prompt = ps_prompt;
994 #endif
995
996 return cli_readline(prompt);
997 }
998 #endif
999
1000 static void get_user_input(struct in_str *i)
1001 {
1002 #ifndef __U_BOOT__
1003 char *prompt_str;
1004 static char the_command[BUFSIZ];
1005
1006 setup_prompt_string(i->promptmode, &prompt_str);
1007 #ifdef CONFIG_FEATURE_COMMAND_EDITING
1008 /*
1009 ** enable command line editing only while a command line
1010 ** is actually being read; otherwise, we'll end up bequeathing
1011 ** atexit() handlers and other unwanted stuff to our
1012 ** child processes (rob@sysgo.de)
1013 */
1014 cmdedit_read_input(prompt_str, the_command);
1015 #else
1016 fputs(prompt_str, stdout);
1017 fflush(stdout);
1018 the_command[0]=fgetc(i->file);
1019 the_command[1]='\0';
1020 #endif
1021 fflush(stdout);
1022 i->p = the_command;
1023 #else
1024 int n;
1025 static char the_command[CONFIG_SYS_CBSIZE + 1];
1026
1027 bootretry_reset_cmd_timeout();
1028 i->__promptme = 1;
1029 n = uboot_cli_readline(i);
1030
1031 #ifdef CONFIG_BOOT_RETRY_TIME
1032 if (n == -2) {
1033 puts("\nTimeout waiting for command\n");
1034 # ifdef CONFIG_RESET_TO_RETRY
1035 do_reset(NULL, 0, 0, NULL);
1036 # else
1037 # error "This currently only works with CONFIG_RESET_TO_RETRY enabled"
1038 # endif
1039 }
1040 #endif
1041 if (n == -1 ) {
1042 flag_repeat = 0;
1043 i->__promptme = 0;
1044 }
1045 n = strlen(console_buffer);
1046 console_buffer[n] = '\n';
1047 console_buffer[n+1]= '\0';
1048 if (had_ctrlc()) flag_repeat = 0;
1049 clear_ctrlc();
1050 do_repeat = 0;
1051 if (i->promptmode == 1) {
1052 if (console_buffer[0] == '\n'&& flag_repeat == 0) {
1053 strcpy(the_command,console_buffer);
1054 }
1055 else {
1056 if (console_buffer[0] != '\n') {
1057 strcpy(the_command,console_buffer);
1058 flag_repeat = 1;
1059 }
1060 else {
1061 do_repeat = 1;
1062 }
1063 }
1064 i->p = the_command;
1065 }
1066 else {
1067 if (console_buffer[0] != '\n') {
1068 if (strlen(the_command) + strlen(console_buffer)
1069 < CONFIG_SYS_CBSIZE) {
1070 n = strlen(the_command);
1071 the_command[n-1] = ' ';
1072 strcpy(&the_command[n],console_buffer);
1073 }
1074 else {
1075 the_command[0] = '\n';
1076 the_command[1] = '\0';
1077 flag_repeat = 0;
1078 }
1079 }
1080 if (i->__promptme == 0) {
1081 the_command[0] = '\n';
1082 the_command[1] = '\0';
1083 }
1084 i->p = console_buffer;
1085 }
1086 #endif
1087 }
1088
1089 /* This is the magic location that prints prompts
1090 * and gets data back from the user */
1091 static int file_get(struct in_str *i)
1092 {
1093 int ch;
1094
1095 ch = 0;
1096 /* If there is data waiting, eat it up */
1097 if (i->p && *i->p) {
1098 ch = *i->p++;
1099 } else {
1100 /* need to double check i->file because we might be doing something
1101 * more complicated by now, like sourcing or substituting. */
1102 #ifndef __U_BOOT__
1103 if (i->__promptme && interactive && i->file == stdin) {
1104 while(! i->p || (interactive && strlen(i->p)==0) ) {
1105 #else
1106 while(! i->p || strlen(i->p)==0 ) {
1107 #endif
1108 get_user_input(i);
1109 }
1110 i->promptmode=2;
1111 #ifndef __U_BOOT__
1112 i->__promptme = 0;
1113 #endif
1114 if (i->p && *i->p) {
1115 ch = *i->p++;
1116 }
1117 #ifndef __U_BOOT__
1118 } else {
1119 ch = fgetc(i->file);
1120 }
1121
1122 #endif
1123 debug_printf("b_getch: got a %d\n", ch);
1124 }
1125 #ifndef __U_BOOT__
1126 if (ch == '\n') i->__promptme=1;
1127 #endif
1128 return ch;
1129 }
1130
1131 /* All the callers guarantee this routine will never be
1132 * used right after a newline, so prompting is not needed.
1133 */
1134 static int file_peek(struct in_str *i)
1135 {
1136 #ifndef __U_BOOT__
1137 if (i->p && *i->p) {
1138 #endif
1139 return *i->p;
1140 #ifndef __U_BOOT__
1141 } else {
1142 i->peek_buf[0] = fgetc(i->file);
1143 i->peek_buf[1] = '\0';
1144 i->p = i->peek_buf;
1145 debug_printf("b_peek: got a %d\n", *i->p);
1146 return *i->p;
1147 }
1148 #endif
1149 }
1150
1151 #ifndef __U_BOOT__
1152 static void setup_file_in_str(struct in_str *i, FILE *f)
1153 #else
1154 static void setup_file_in_str(struct in_str *i)
1155 #endif
1156 {
1157 i->peek = file_peek;
1158 i->get = file_get;
1159 i->__promptme=1;
1160 i->promptmode=1;
1161 #ifndef __U_BOOT__
1162 i->file = f;
1163 #endif
1164 i->p = NULL;
1165 }
1166
1167 static void setup_string_in_str(struct in_str *i, const char *s)
1168 {
1169 i->peek = static_peek;
1170 i->get = static_get;
1171 i->__promptme=1;
1172 i->promptmode=1;
1173 i->p = s;
1174 }
1175
1176 #ifndef __U_BOOT__
1177 static void mark_open(int fd)
1178 {
1179 struct close_me *new = xmalloc(sizeof(struct close_me));
1180 new->fd = fd;
1181 new->next = close_me_head;
1182 close_me_head = new;
1183 }
1184
1185 static void mark_closed(int fd)
1186 {
1187 struct close_me *tmp;
1188 if (close_me_head == NULL || close_me_head->fd != fd)
1189 error_msg_and_die("corrupt close_me");
1190 tmp = close_me_head;
1191 close_me_head = close_me_head->next;
1192 free(tmp);
1193 }
1194
1195 static void close_all(void)
1196 {
1197 struct close_me *c;
1198 for (c=close_me_head; c; c=c->next) {
1199 close(c->fd);
1200 }
1201 close_me_head = NULL;
1202 }
1203
1204 /* squirrel != NULL means we squirrel away copies of stdin, stdout,
1205 * and stderr if they are redirected. */
1206 static int setup_redirects(struct child_prog *prog, int squirrel[])
1207 {
1208 int openfd, mode;
1209 struct redir_struct *redir;
1210
1211 for (redir=prog->redirects; redir; redir=redir->next) {
1212 if (redir->dup == -1 && redir->word.gl_pathv == NULL) {
1213 /* something went wrong in the parse. Pretend it didn't happen */
1214 continue;
1215 }
1216 if (redir->dup == -1) {
1217 mode=redir_table[redir->type].mode;
1218 openfd = open(redir->word.gl_pathv[0], mode, 0666);
1219 if (openfd < 0) {
1220 /* this could get lost if stderr has been redirected, but
1221 bash and ash both lose it as well (though zsh doesn't!) */
1222 perror_msg("error opening %s", redir->word.gl_pathv[0]);
1223 return 1;
1224 }
1225 } else {
1226 openfd = redir->dup;
1227 }
1228
1229 if (openfd != redir->fd) {
1230 if (squirrel && redir->fd < 3) {
1231 squirrel[redir->fd] = dup(redir->fd);
1232 }
1233 if (openfd == -3) {
1234 close(openfd);
1235 } else {
1236 dup2(openfd, redir->fd);
1237 if (redir->dup == -1)
1238 close (openfd);
1239 }
1240 }
1241 }
1242 return 0;
1243 }
1244
1245 static void restore_redirects(int squirrel[])
1246 {
1247 int i, fd;
1248 for (i=0; i<3; i++) {
1249 fd = squirrel[i];
1250 if (fd != -1) {
1251 /* No error checking. I sure wouldn't know what
1252 * to do with an error if I found one! */
1253 dup2(fd, i);
1254 close(fd);
1255 }
1256 }
1257 }
1258
1259 /* never returns */
1260 /* XXX no exit() here. If you don't exec, use _exit instead.
1261 * The at_exit handlers apparently confuse the calling process,
1262 * in particular stdin handling. Not sure why? */
1263 static void pseudo_exec(struct child_prog *child)
1264 {
1265 int i, rcode;
1266 char *p;
1267 struct built_in_command *x;
1268 if (child->argv) {
1269 for (i=0; is_assignment(child->argv[i]); i++) {
1270 debug_printf("pid %d environment modification: %s\n",getpid(),child->argv[i]);
1271 p = insert_var_value(child->argv[i]);
1272 putenv(strdup(p));
1273 if (p != child->argv[i]) free(p);
1274 }
1275 child->argv+=i; /* XXX this hack isn't so horrible, since we are about
1276 to exit, and therefore don't need to keep data
1277 structures consistent for free() use. */
1278 /* If a variable is assigned in a forest, and nobody listens,
1279 * was it ever really set?
1280 */
1281 if (child->argv[0] == NULL) {
1282 _exit(EXIT_SUCCESS);
1283 }
1284
1285 /*
1286 * Check if the command matches any of the builtins.
1287 * Depending on context, this might be redundant. But it's
1288 * easier to waste a few CPU cycles than it is to figure out
1289 * if this is one of those cases.
1290 */
1291 for (x = bltins; x->cmd; x++) {
1292 if (strcmp(child->argv[0], x->cmd) == 0 ) {
1293 debug_printf("builtin exec %s\n", child->argv[0]);
1294 rcode = x->function(child);
1295 fflush(stdout);
1296 _exit(rcode);
1297 }
1298 }
1299
1300 /* Check if the command matches any busybox internal commands
1301 * ("applets") here.
1302 * FIXME: This feature is not 100% safe, since
1303 * BusyBox is not fully reentrant, so we have no guarantee the things
1304 * from the .bss are still zeroed, or that things from .data are still
1305 * at their defaults. We could exec ourself from /proc/self/exe, but I
1306 * really dislike relying on /proc for things. We could exec ourself
1307 * from global_argv[0], but if we are in a chroot, we may not be able
1308 * to find ourself... */
1309 #ifdef CONFIG_FEATURE_SH_STANDALONE_SHELL
1310 {
1311 int argc_l;
1312 char** argv_l=child->argv;
1313 char *name = child->argv[0];
1314
1315 #ifdef CONFIG_FEATURE_SH_APPLETS_ALWAYS_WIN
1316 /* Following discussions from November 2000 on the busybox mailing
1317 * list, the default configuration, (without
1318 * get_last_path_component()) lets the user force use of an
1319 * external command by specifying the full (with slashes) filename.
1320 * If you enable CONFIG_FEATURE_SH_APPLETS_ALWAYS_WIN then applets
1321 * _aways_ override external commands, so if you want to run
1322 * /bin/cat, it will use BusyBox cat even if /bin/cat exists on the
1323 * filesystem and is _not_ busybox. Some systems may want this,
1324 * most do not. */
1325 name = get_last_path_component(name);
1326 #endif
1327 /* Count argc for use in a second... */
1328 for(argc_l=0;*argv_l!=NULL; argv_l++, argc_l++);
1329 optind = 1;
1330 debug_printf("running applet %s\n", name);
1331 run_applet_by_name(name, argc_l, child->argv);
1332 }
1333 #endif
1334 debug_printf("exec of %s\n",child->argv[0]);
1335 execvp(child->argv[0],child->argv);
1336 perror_msg("couldn't exec: %s",child->argv[0]);
1337 _exit(1);
1338 } else if (child->group) {
1339 debug_printf("runtime nesting to group\n");
1340 interactive=0; /* crucial!!!! */
1341 rcode = run_list_real(child->group);
1342 /* OK to leak memory by not calling free_pipe_list,
1343 * since this process is about to exit */
1344 _exit(rcode);
1345 } else {
1346 /* Can happen. See what bash does with ">foo" by itself. */
1347 debug_printf("trying to pseudo_exec null command\n");
1348 _exit(EXIT_SUCCESS);
1349 }
1350 }
1351
1352 static void insert_bg_job(struct pipe *pi)
1353 {
1354 struct pipe *thejob;
1355
1356 /* Linear search for the ID of the job to use */
1357 pi->jobid = 1;
1358 for (thejob = job_list; thejob; thejob = thejob->next)
1359 if (thejob->jobid >= pi->jobid)
1360 pi->jobid = thejob->jobid + 1;
1361
1362 /* add thejob to the list of running jobs */
1363 if (!job_list) {
1364 thejob = job_list = xmalloc(sizeof(*thejob));
1365 } else {
1366 for (thejob = job_list; thejob->next; thejob = thejob->next) /* nothing */;
1367 thejob->next = xmalloc(sizeof(*thejob));
1368 thejob = thejob->next;
1369 }
1370
1371 /* physically copy the struct job */
1372 memcpy(thejob, pi, sizeof(struct pipe));
1373 thejob->next = NULL;
1374 thejob->running_progs = thejob->num_progs;
1375 thejob->stopped_progs = 0;
1376 thejob->text = xmalloc(BUFSIZ); /* cmdedit buffer size */
1377
1378 /*if (pi->progs[0] && pi->progs[0].argv && pi->progs[0].argv[0]) */
1379 {
1380 char *bar=thejob->text;
1381 char **foo=pi->progs[0].argv;
1382 while(foo && *foo) {
1383 bar += sprintf(bar, "%s ", *foo++);
1384 }
1385 }
1386
1387 /* we don't wait for background thejobs to return -- append it
1388 to the list of backgrounded thejobs and leave it alone */
1389 printf("[%d] %d\n", thejob->jobid, thejob->progs[0].pid);
1390 last_bg_pid = thejob->progs[0].pid;
1391 last_jobid = thejob->jobid;
1392 }
1393
1394 /* remove a backgrounded job */
1395 static void remove_bg_job(struct pipe *pi)
1396 {
1397 struct pipe *prev_pipe;
1398
1399 if (pi == job_list) {
1400 job_list = pi->next;
1401 } else {
1402 prev_pipe = job_list;
1403 while (prev_pipe->next != pi)
1404 prev_pipe = prev_pipe->next;
1405 prev_pipe->next = pi->next;
1406 }
1407 if (job_list)
1408 last_jobid = job_list->jobid;
1409 else
1410 last_jobid = 0;
1411
1412 pi->stopped_progs = 0;
1413 free_pipe(pi, 0);
1414 free(pi);
1415 }
1416
1417 /* Checks to see if any processes have exited -- if they
1418 have, figure out why and see if a job has completed */
1419 static int checkjobs(struct pipe* fg_pipe)
1420 {
1421 int attributes;
1422 int status;
1423 int prognum = 0;
1424 struct pipe *pi;
1425 pid_t childpid;
1426
1427 attributes = WUNTRACED;
1428 if (fg_pipe==NULL) {
1429 attributes |= WNOHANG;
1430 }
1431
1432 while ((childpid = waitpid(-1, &status, attributes)) > 0) {
1433 if (fg_pipe) {
1434 int i, rcode = 0;
1435 for (i=0; i < fg_pipe->num_progs; i++) {
1436 if (fg_pipe->progs[i].pid == childpid) {
1437 if (i==fg_pipe->num_progs-1)
1438 rcode=WEXITSTATUS(status);
1439 (fg_pipe->num_progs)--;
1440 return(rcode);
1441 }
1442 }
1443 }
1444
1445 for (pi = job_list; pi; pi = pi->next) {
1446 prognum = 0;
1447 while (prognum < pi->num_progs && pi->progs[prognum].pid != childpid) {
1448 prognum++;
1449 }
1450 if (prognum < pi->num_progs)
1451 break;
1452 }
1453
1454 if(pi==NULL) {
1455 debug_printf("checkjobs: pid %d was not in our list!\n", childpid);
1456 continue;
1457 }
1458
1459 if (WIFEXITED(status) || WIFSIGNALED(status)) {
1460 /* child exited */
1461 pi->running_progs--;
1462 pi->progs[prognum].pid = 0;
1463
1464 if (!pi->running_progs) {
1465 printf(JOB_STATUS_FORMAT, pi->jobid, "Done", pi->text);
1466 remove_bg_job(pi);
1467 }
1468 } else {
1469 /* child stopped */
1470 pi->stopped_progs++;
1471 pi->progs[prognum].is_stopped = 1;
1472
1473 #if 0
1474 /* Printing this stuff is a pain, since it tends to
1475 * overwrite the prompt an inconveinient moments. So
1476 * don't do that. */
1477 if (pi->stopped_progs == pi->num_progs) {
1478 printf("\n"JOB_STATUS_FORMAT, pi->jobid, "Stopped", pi->text);
1479 }
1480 #endif
1481 }
1482 }
1483
1484 if (childpid == -1 && errno != ECHILD)
1485 perror_msg("waitpid");
1486
1487 /* move the shell to the foreground */
1488 /*if (interactive && tcsetpgrp(shell_terminal, getpgid(0))) */
1489 /* perror_msg("tcsetpgrp-2"); */
1490 return -1;
1491 }
1492
1493 /* Figure out our controlling tty, checking in order stderr,
1494 * stdin, and stdout. If check_pgrp is set, also check that
1495 * we belong to the foreground process group associated with
1496 * that tty. The value of shell_terminal is needed in order to call
1497 * tcsetpgrp(shell_terminal, ...); */
1498 void controlling_tty(int check_pgrp)
1499 {
1500 pid_t curpgrp;
1501
1502 if ((curpgrp = tcgetpgrp(shell_terminal = 2)) < 0
1503 && (curpgrp = tcgetpgrp(shell_terminal = 0)) < 0
1504 && (curpgrp = tcgetpgrp(shell_terminal = 1)) < 0)
1505 goto shell_terminal_error;
1506
1507 if (check_pgrp && curpgrp != getpgid(0))
1508 goto shell_terminal_error;
1509
1510 return;
1511
1512 shell_terminal_error:
1513 shell_terminal = -1;
1514 return;
1515 }
1516 #endif
1517
1518 /* run_pipe_real() starts all the jobs, but doesn't wait for anything
1519 * to finish. See checkjobs().
1520 *
1521 * return code is normally -1, when the caller has to wait for children
1522 * to finish to determine the exit status of the pipe. If the pipe
1523 * is a simple builtin command, however, the action is done by the
1524 * time run_pipe_real returns, and the exit code is provided as the
1525 * return value.
1526 *
1527 * The input of the pipe is always stdin, the output is always
1528 * stdout. The outpipe[] mechanism in BusyBox-0.48 lash is bogus,
1529 * because it tries to avoid running the command substitution in
1530 * subshell, when that is in fact necessary. The subshell process
1531 * now has its stdout directed to the input of the appropriate pipe,
1532 * so this routine is noticeably simpler.
1533 */
1534 static int run_pipe_real(struct pipe *pi)
1535 {
1536 int i;
1537 #ifndef __U_BOOT__
1538 int nextin, nextout;
1539 int pipefds[2]; /* pipefds[0] is for reading */
1540 struct child_prog *child;
1541 struct built_in_command *x;
1542 char *p;
1543 # if __GNUC__
1544 /* Avoid longjmp clobbering */
1545 (void) &i;
1546 (void) &nextin;
1547 (void) &nextout;
1548 (void) &child;
1549 # endif
1550 #else
1551 int nextin;
1552 int flag = do_repeat ? CMD_FLAG_REPEAT : 0;
1553 struct child_prog *child;
1554 char *p;
1555 # if __GNUC__
1556 /* Avoid longjmp clobbering */
1557 (void) &i;
1558 (void) &nextin;
1559 (void) &child;
1560 # endif
1561 #endif /* __U_BOOT__ */
1562
1563 nextin = 0;
1564 #ifndef __U_BOOT__
1565 pi->pgrp = -1;
1566 #endif
1567
1568 /* Check if this is a simple builtin (not part of a pipe).
1569 * Builtins within pipes have to fork anyway, and are handled in
1570 * pseudo_exec. "echo foo | read bar" doesn't work on bash, either.
1571 */
1572 if (pi->num_progs == 1) child = & (pi->progs[0]);
1573 #ifndef __U_BOOT__
1574 if (pi->num_progs == 1 && child->group && child->subshell == 0) {
1575 int squirrel[] = {-1, -1, -1};
1576 int rcode;
1577 debug_printf("non-subshell grouping\n");
1578 setup_redirects(child, squirrel);
1579 /* XXX could we merge code with following builtin case,
1580 * by creating a pseudo builtin that calls run_list_real? */
1581 rcode = run_list_real(child->group);
1582 restore_redirects(squirrel);
1583 #else
1584 if (pi->num_progs == 1 && child->group) {
1585 int rcode;
1586 debug_printf("non-subshell grouping\n");
1587 rcode = run_list_real(child->group);
1588 #endif
1589 return rcode;
1590 } else if (pi->num_progs == 1 && pi->progs[0].argv != NULL) {
1591 for (i=0; is_assignment(child->argv[i]); i++) { /* nothing */ }
1592 if (i!=0 && child->argv[i]==NULL) {
1593 /* assignments, but no command: set the local environment */
1594 for (i=0; child->argv[i]!=NULL; i++) {
1595
1596 /* Ok, this case is tricky. We have to decide if this is a
1597 * local variable, or an already exported variable. If it is
1598 * already exported, we have to export the new value. If it is
1599 * not exported, we need only set this as a local variable.
1600 * This junk is all to decide whether or not to export this
1601 * variable. */
1602 int export_me=0;
1603 char *name, *value;
1604 name = xstrdup(child->argv[i]);
1605 debug_printf("Local environment set: %s\n", name);
1606 value = strchr(name, '=');
1607 if (value)
1608 *value=0;
1609 #ifndef __U_BOOT__
1610 if ( get_local_var(name)) {
1611 export_me=1;
1612 }
1613 #endif
1614 free(name);
1615 p = insert_var_value(child->argv[i]);
1616 set_local_var(p, export_me);
1617 if (p != child->argv[i]) free(p);
1618 }
1619 return EXIT_SUCCESS; /* don't worry about errors in set_local_var() yet */
1620 }
1621 for (i = 0; is_assignment(child->argv[i]); i++) {
1622 p = insert_var_value(child->argv[i]);
1623 #ifndef __U_BOOT__
1624 putenv(strdup(p));
1625 #else
1626 set_local_var(p, 0);
1627 #endif
1628 if (p != child->argv[i]) {
1629 child->sp--;
1630 free(p);
1631 }
1632 }
1633 if (child->sp) {
1634 char * str = NULL;
1635
1636 str = make_string(child->argv + i,
1637 child->argv_nonnull + i);
1638 parse_string_outer(str, FLAG_EXIT_FROM_LOOP | FLAG_REPARSING);
1639 free(str);
1640 return last_return_code;
1641 }
1642 #ifndef __U_BOOT__
1643 for (x = bltins; x->cmd; x++) {
1644 if (strcmp(child->argv[i], x->cmd) == 0 ) {
1645 int squirrel[] = {-1, -1, -1};
1646 int rcode;
1647 if (x->function == builtin_exec && child->argv[i+1]==NULL) {
1648 debug_printf("magic exec\n");
1649 setup_redirects(child,NULL);
1650 return EXIT_SUCCESS;
1651 }
1652 debug_printf("builtin inline %s\n", child->argv[0]);
1653 /* XXX setup_redirects acts on file descriptors, not FILEs.
1654 * This is perfect for work that comes after exec().
1655 * Is it really safe for inline use? Experimentally,
1656 * things seem to work with glibc. */
1657 setup_redirects(child, squirrel);
1658
1659 child->argv += i; /* XXX horrible hack */
1660 rcode = x->function(child);
1661 /* XXX restore hack so free() can work right */
1662 child->argv -= i;
1663 restore_redirects(squirrel);
1664 }
1665 return rcode;
1666 }
1667 #else
1668 /* check ";", because ,example , argv consist from
1669 * "help;flinfo" must not execute
1670 */
1671 if (strchr(child->argv[i], ';')) {
1672 printf("Unknown command '%s' - try 'help' or use "
1673 "'run' command\n", child->argv[i]);
1674 return -1;
1675 }
1676 /* Process the command */
1677 return cmd_process(flag, child->argc, child->argv,
1678 &flag_repeat, NULL);
1679 #endif
1680 }
1681 #ifndef __U_BOOT__
1682
1683 for (i = 0; i < pi->num_progs; i++) {
1684 child = & (pi->progs[i]);
1685
1686 /* pipes are inserted between pairs of commands */
1687 if ((i + 1) < pi->num_progs) {
1688 if (pipe(pipefds)<0) perror_msg_and_die("pipe");
1689 nextout = pipefds[1];
1690 } else {
1691 nextout=1;
1692 pipefds[0] = -1;
1693 }
1694
1695 /* XXX test for failed fork()? */
1696 if (!(child->pid = fork())) {
1697 /* Set the handling for job control signals back to the default. */
1698 signal(SIGINT, SIG_DFL);
1699 signal(SIGQUIT, SIG_DFL);
1700 signal(SIGTERM, SIG_DFL);
1701 signal(SIGTSTP, SIG_DFL);
1702 signal(SIGTTIN, SIG_DFL);
1703 signal(SIGTTOU, SIG_DFL);
1704 signal(SIGCHLD, SIG_DFL);
1705
1706 close_all();
1707
1708 if (nextin != 0) {
1709 dup2(nextin, 0);
1710 close(nextin);
1711 }
1712 if (nextout != 1) {
1713 dup2(nextout, 1);
1714 close(nextout);
1715 }
1716 if (pipefds[0]!=-1) {
1717 close(pipefds[0]); /* opposite end of our output pipe */
1718 }
1719
1720 /* Like bash, explicit redirects override pipes,
1721 * and the pipe fd is available for dup'ing. */
1722 setup_redirects(child,NULL);
1723
1724 if (interactive && pi->followup!=PIPE_BG) {
1725 /* If we (the child) win the race, put ourselves in the process
1726 * group whose leader is the first process in this pipe. */
1727 if (pi->pgrp < 0) {
1728 pi->pgrp = getpid();
1729 }
1730 if (setpgid(0, pi->pgrp) == 0) {
1731 tcsetpgrp(2, pi->pgrp);
1732 }
1733 }
1734
1735 pseudo_exec(child);
1736 }
1737
1738
1739 /* put our child in the process group whose leader is the
1740 first process in this pipe */
1741 if (pi->pgrp < 0) {
1742 pi->pgrp = child->pid;
1743 }
1744 /* Don't check for errors. The child may be dead already,
1745 * in which case setpgid returns error code EACCES. */
1746 setpgid(child->pid, pi->pgrp);
1747
1748 if (nextin != 0)
1749 close(nextin);
1750 if (nextout != 1)
1751 close(nextout);
1752
1753 /* If there isn't another process, nextin is garbage
1754 but it doesn't matter */
1755 nextin = pipefds[0];
1756 }
1757 #endif
1758 return -1;
1759 }
1760
1761 static int run_list_real(struct pipe *pi)
1762 {
1763 char *save_name = NULL;
1764 char **list = NULL;
1765 char **save_list = NULL;
1766 struct pipe *rpipe;
1767 int flag_rep = 0;
1768 #ifndef __U_BOOT__
1769 int save_num_progs;
1770 #endif
1771 int rcode=0, flag_skip=1;
1772 int flag_restore = 0;
1773 int if_code=0, next_if_code=0; /* need double-buffer to handle elif */
1774 reserved_style rmode, skip_more_in_this_rmode=RES_XXXX;
1775 /* check syntax for "for" */
1776 for (rpipe = pi; rpipe; rpipe = rpipe->next) {
1777 if ((rpipe->r_mode == RES_IN ||
1778 rpipe->r_mode == RES_FOR) &&
1779 (rpipe->next == NULL)) {
1780 syntax();
1781 #ifdef __U_BOOT__
1782 flag_repeat = 0;
1783 #endif
1784 return 1;
1785 }
1786 if ((rpipe->r_mode == RES_IN &&
1787 (rpipe->next->r_mode == RES_IN &&
1788 rpipe->next->progs->argv != NULL))||
1789 (rpipe->r_mode == RES_FOR &&
1790 rpipe->next->r_mode != RES_IN)) {
1791 syntax();
1792 #ifdef __U_BOOT__
1793 flag_repeat = 0;
1794 #endif
1795 return 1;
1796 }
1797 }
1798 for (; pi; pi = (flag_restore != 0) ? rpipe : pi->next) {
1799 if (pi->r_mode == RES_WHILE || pi->r_mode == RES_UNTIL ||
1800 pi->r_mode == RES_FOR) {
1801 #ifdef __U_BOOT__
1802 /* check Ctrl-C */
1803 ctrlc();
1804 if ((had_ctrlc())) {
1805 return 1;
1806 }
1807 #endif
1808 flag_restore = 0;
1809 if (!rpipe) {
1810 flag_rep = 0;
1811 rpipe = pi;
1812 }
1813 }
1814 rmode = pi->r_mode;
1815 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);
1816 if (rmode == skip_more_in_this_rmode && flag_skip) {
1817 if (pi->followup == PIPE_SEQ) flag_skip=0;
1818 continue;
1819 }
1820 flag_skip = 1;
1821 skip_more_in_this_rmode = RES_XXXX;
1822 if (rmode == RES_THEN || rmode == RES_ELSE) if_code = next_if_code;
1823 if (rmode == RES_THEN && if_code) continue;
1824 if (rmode == RES_ELSE && !if_code) continue;
1825 if (rmode == RES_ELIF && !if_code) break;
1826 if (rmode == RES_FOR && pi->num_progs) {
1827 if (!list) {
1828 /* if no variable values after "in" we skip "for" */
1829 if (!pi->next->progs->argv) continue;
1830 /* create list of variable values */
1831 list = make_list_in(pi->next->progs->argv,
1832 pi->progs->argv[0]);
1833 save_list = list;
1834 save_name = pi->progs->argv[0];
1835 pi->progs->argv[0] = NULL;
1836 flag_rep = 1;
1837 }
1838 if (!(*list)) {
1839 free(pi->progs->argv[0]);
1840 free(save_list);
1841 list = NULL;
1842 flag_rep = 0;
1843 pi->progs->argv[0] = save_name;
1844 #ifndef __U_BOOT__
1845 pi->progs->glob_result.gl_pathv[0] =
1846 pi->progs->argv[0];
1847 #endif
1848 continue;
1849 } else {
1850 /* insert new value from list for variable */
1851 if (pi->progs->argv[0])
1852 free(pi->progs->argv[0]);
1853 pi->progs->argv[0] = *list++;
1854 #ifndef __U_BOOT__
1855 pi->progs->glob_result.gl_pathv[0] =
1856 pi->progs->argv[0];
1857 #endif
1858 }
1859 }
1860 if (rmode == RES_IN) continue;
1861 if (rmode == RES_DO) {
1862 if (!flag_rep) continue;
1863 }
1864 if (rmode == RES_DONE) {
1865 if (flag_rep) {
1866 flag_restore = 1;
1867 } else {
1868 rpipe = NULL;
1869 }
1870 }
1871 if (pi->num_progs == 0) continue;
1872 #ifndef __U_BOOT__
1873 save_num_progs = pi->num_progs; /* save number of programs */
1874 #endif
1875 rcode = run_pipe_real(pi);
1876 debug_printf("run_pipe_real returned %d\n",rcode);
1877 #ifndef __U_BOOT__
1878 if (rcode!=-1) {
1879 /* We only ran a builtin: rcode was set by the return value
1880 * of run_pipe_real(), and we don't need to wait for anything. */
1881 } else if (pi->followup==PIPE_BG) {
1882 /* XXX check bash's behavior with nontrivial pipes */
1883 /* XXX compute jobid */
1884 /* XXX what does bash do with attempts to background builtins? */
1885 insert_bg_job(pi);
1886 rcode = EXIT_SUCCESS;
1887 } else {
1888 if (interactive) {
1889 /* move the new process group into the foreground */
1890 if (tcsetpgrp(shell_terminal, pi->pgrp) && errno != ENOTTY)
1891 perror_msg("tcsetpgrp-3");
1892 rcode = checkjobs(pi);
1893 /* move the shell to the foreground */
1894 if (tcsetpgrp(shell_terminal, getpgid(0)) && errno != ENOTTY)
1895 perror_msg("tcsetpgrp-4");
1896 } else {
1897 rcode = checkjobs(pi);
1898 }
1899 debug_printf("checkjobs returned %d\n",rcode);
1900 }
1901 last_return_code=rcode;
1902 #else
1903 if (rcode < -1) {
1904 last_return_code = -rcode - 2;
1905 return -2; /* exit */
1906 }
1907 last_return_code=(rcode == 0) ? 0 : 1;
1908 #endif
1909 #ifndef __U_BOOT__
1910 pi->num_progs = save_num_progs; /* restore number of programs */
1911 #endif
1912 if ( rmode == RES_IF || rmode == RES_ELIF )
1913 next_if_code=rcode; /* can be overwritten a number of times */
1914 if (rmode == RES_WHILE)
1915 flag_rep = !last_return_code;
1916 if (rmode == RES_UNTIL)
1917 flag_rep = last_return_code;
1918 if ( (rcode==EXIT_SUCCESS && pi->followup==PIPE_OR) ||
1919 (rcode!=EXIT_SUCCESS && pi->followup==PIPE_AND) )
1920 skip_more_in_this_rmode=rmode;
1921 #ifndef __U_BOOT__
1922 checkjobs(NULL);
1923 #endif
1924 }
1925 return rcode;
1926 }
1927
1928 /* broken, of course, but OK for testing */
1929 static char *indenter(int i)
1930 {
1931 static char blanks[]=" ";
1932 return &blanks[sizeof(blanks)-i-1];
1933 }
1934
1935 /* return code is the exit status of the pipe */
1936 static int free_pipe(struct pipe *pi, int indent)
1937 {
1938 char **p;
1939 struct child_prog *child;
1940 #ifndef __U_BOOT__
1941 struct redir_struct *r, *rnext;
1942 #endif
1943 int a, i, ret_code=0;
1944 char *ind = indenter(indent);
1945
1946 #ifndef __U_BOOT__
1947 if (pi->stopped_progs > 0)
1948 return ret_code;
1949 final_printf("%s run pipe: (pid %d)\n",ind,getpid());
1950 #endif
1951 for (i=0; i<pi->num_progs; i++) {
1952 child = &pi->progs[i];
1953 final_printf("%s command %d:\n",ind,i);
1954 if (child->argv) {
1955 for (a=0,p=child->argv; *p; a++,p++) {
1956 final_printf("%s argv[%d] = %s\n",ind,a,*p);
1957 }
1958 #ifndef __U_BOOT__
1959 globfree(&child->glob_result);
1960 #else
1961 for (a = 0; a < child->argc; a++) {
1962 free(child->argv[a]);
1963 }
1964 free(child->argv);
1965 free(child->argv_nonnull);
1966 child->argc = 0;
1967 #endif
1968 child->argv=NULL;
1969 } else if (child->group) {
1970 #ifndef __U_BOOT__
1971 final_printf("%s begin group (subshell:%d)\n",ind, child->subshell);
1972 #endif
1973 ret_code = free_pipe_list(child->group,indent+3);
1974 final_printf("%s end group\n",ind);
1975 } else {
1976 final_printf("%s (nil)\n",ind);
1977 }
1978 #ifndef __U_BOOT__
1979 for (r=child->redirects; r; r=rnext) {
1980 final_printf("%s redirect %d%s", ind, r->fd, redir_table[r->type].descrip);
1981 if (r->dup == -1) {
1982 /* guard against the case >$FOO, where foo is unset or blank */
1983 if (r->word.gl_pathv) {
1984 final_printf(" %s\n", *r->word.gl_pathv);
1985 globfree(&r->word);
1986 }
1987 } else {
1988 final_printf("&%d\n", r->dup);
1989 }
1990 rnext=r->next;
1991 free(r);
1992 }
1993 child->redirects=NULL;
1994 #endif
1995 }
1996 free(pi->progs); /* children are an array, they get freed all at once */
1997 pi->progs=NULL;
1998 return ret_code;
1999 }
2000
2001 static int free_pipe_list(struct pipe *head, int indent)
2002 {
2003 int rcode=0; /* if list has no members */
2004 struct pipe *pi, *next;
2005 char *ind = indenter(indent);
2006 for (pi=head; pi; pi=next) {
2007 final_printf("%s pipe reserved mode %d\n", ind, pi->r_mode);
2008 rcode = free_pipe(pi, indent);
2009 final_printf("%s pipe followup code %d\n", ind, pi->followup);
2010 next=pi->next;
2011 pi->next=NULL;
2012 free(pi);
2013 }
2014 return rcode;
2015 }
2016
2017 /* Select which version we will use */
2018 static int run_list(struct pipe *pi)
2019 {
2020 int rcode=0;
2021 #ifndef __U_BOOT__
2022 if (fake_mode==0) {
2023 #endif
2024 rcode = run_list_real(pi);
2025 #ifndef __U_BOOT__
2026 }
2027 #endif
2028 /* free_pipe_list has the side effect of clearing memory
2029 * In the long run that function can be merged with run_list_real,
2030 * but doing that now would hobble the debugging effort. */
2031 free_pipe_list(pi,0);
2032 return rcode;
2033 }
2034
2035 /* The API for glob is arguably broken. This routine pushes a non-matching
2036 * string into the output structure, removing non-backslashed backslashes.
2037 * If someone can prove me wrong, by performing this function within the
2038 * original glob(3) api, feel free to rewrite this routine into oblivion.
2039 * Return code (0 vs. GLOB_NOSPACE) matches glob(3).
2040 * XXX broken if the last character is '\\', check that before calling.
2041 */
2042 #ifndef __U_BOOT__
2043 static int globhack(const char *src, int flags, glob_t *pglob)
2044 {
2045 int cnt=0, pathc;
2046 const char *s;
2047 char *dest;
2048 for (cnt=1, s=src; s && *s; s++) {
2049 if (*s == '\\') s++;
2050 cnt++;
2051 }
2052 dest = malloc(cnt);
2053 if (!dest) return GLOB_NOSPACE;
2054 if (!(flags & GLOB_APPEND)) {
2055 pglob->gl_pathv=NULL;
2056 pglob->gl_pathc=0;
2057 pglob->gl_offs=0;
2058 pglob->gl_offs=0;
2059 }
2060 pathc = ++pglob->gl_pathc;
2061 pglob->gl_pathv = realloc(pglob->gl_pathv, (pathc+1)*sizeof(*pglob->gl_pathv));
2062 if (pglob->gl_pathv == NULL) return GLOB_NOSPACE;
2063 pglob->gl_pathv[pathc-1]=dest;
2064 pglob->gl_pathv[pathc]=NULL;
2065 for (s=src; s && *s; s++, dest++) {
2066 if (*s == '\\') s++;
2067 *dest = *s;
2068 }
2069 *dest='\0';
2070 return 0;
2071 }
2072
2073 /* XXX broken if the last character is '\\', check that before calling */
2074 static int glob_needed(const char *s)
2075 {
2076 for (; *s; s++) {
2077 if (*s == '\\') s++;
2078 if (strchr("*[?",*s)) return 1;
2079 }
2080 return 0;
2081 }
2082
2083 #if 0
2084 static void globprint(glob_t *pglob)
2085 {
2086 int i;
2087 debug_printf("glob_t at %p:\n", pglob);
2088 debug_printf(" gl_pathc=%d gl_pathv=%p gl_offs=%d gl_flags=%d\n",
2089 pglob->gl_pathc, pglob->gl_pathv, pglob->gl_offs, pglob->gl_flags);
2090 for (i=0; i<pglob->gl_pathc; i++)
2091 debug_printf("pglob->gl_pathv[%d] = %p = %s\n", i,
2092 pglob->gl_pathv[i], pglob->gl_pathv[i]);
2093 }
2094 #endif
2095
2096 static int xglob(o_string *dest, int flags, glob_t *pglob)
2097 {
2098 int gr;
2099
2100 /* short-circuit for null word */
2101 /* we can code this better when the debug_printf's are gone */
2102 if (dest->length == 0) {
2103 if (dest->nonnull) {
2104 /* bash man page calls this an "explicit" null */
2105 gr = globhack(dest->data, flags, pglob);
2106 debug_printf("globhack returned %d\n",gr);
2107 } else {
2108 return 0;
2109 }
2110 } else if (glob_needed(dest->data)) {
2111 gr = glob(dest->data, flags, NULL, pglob);
2112 debug_printf("glob returned %d\n",gr);
2113 if (gr == GLOB_NOMATCH) {
2114 /* quote removal, or more accurately, backslash removal */
2115 gr = globhack(dest->data, flags, pglob);
2116 debug_printf("globhack returned %d\n",gr);
2117 }
2118 } else {
2119 gr = globhack(dest->data, flags, pglob);
2120 debug_printf("globhack returned %d\n",gr);
2121 }
2122 if (gr == GLOB_NOSPACE)
2123 error_msg_and_die("out of memory during glob");
2124 if (gr != 0) { /* GLOB_ABORTED ? */
2125 error_msg("glob(3) error %d",gr);
2126 }
2127 /* globprint(glob_target); */
2128 return gr;
2129 }
2130 #endif
2131
2132 #ifdef __U_BOOT__
2133 static char *get_dollar_var(char ch);
2134 #endif
2135
2136 /* This is used to get/check local shell variables */
2137 char *get_local_var(const char *s)
2138 {
2139 struct variables *cur;
2140
2141 if (!s)
2142 return NULL;
2143
2144 #ifdef __U_BOOT__
2145 if (*s == '$')
2146 return get_dollar_var(s[1]);
2147 #endif
2148
2149 for (cur = top_vars; cur; cur=cur->next)
2150 if(strcmp(cur->name, s)==0)
2151 return cur->value;
2152 return NULL;
2153 }
2154
2155 /* This is used to set local shell variables
2156 flg_export==0 if only local (not exporting) variable
2157 flg_export==1 if "new" exporting environ
2158 flg_export>1 if current startup environ (not call putenv()) */
2159 int set_local_var(const char *s, int flg_export)
2160 {
2161 char *name, *value;
2162 int result=0;
2163 struct variables *cur;
2164
2165 #ifdef __U_BOOT__
2166 /* might be possible! */
2167 if (!isalpha(*s))
2168 return -1;
2169 #endif
2170
2171 name=strdup(s);
2172
2173 #ifdef __U_BOOT__
2174 if (env_get(name) != NULL) {
2175 printf ("ERROR: "
2176 "There is a global environment variable with the same name.\n");
2177 free(name);
2178 return -1;
2179 }
2180 #endif
2181 /* Assume when we enter this function that we are already in
2182 * NAME=VALUE format. So the first order of business is to
2183 * split 's' on the '=' into 'name' and 'value' */
2184 value = strchr(name, '=');
2185 if (value == NULL || *(value + 1) == 0) {
2186 free(name);
2187 return -1;
2188 }
2189 *value++ = 0;
2190
2191 for(cur = top_vars; cur; cur = cur->next) {
2192 if(strcmp(cur->name, name)==0)
2193 break;
2194 }
2195
2196 if(cur) {
2197 if(strcmp(cur->value, value)==0) {
2198 if(flg_export>0 && cur->flg_export==0)
2199 cur->flg_export=flg_export;
2200 else
2201 result++;
2202 } else {
2203 if(cur->flg_read_only) {
2204 error_msg("%s: readonly variable", name);
2205 result = -1;
2206 } else {
2207 if(flg_export>0 || cur->flg_export>1)
2208 cur->flg_export=1;
2209 free(cur->value);
2210
2211 cur->value = strdup(value);
2212 }
2213 }
2214 } else {
2215 cur = malloc(sizeof(struct variables));
2216 if(!cur) {
2217 result = -1;
2218 } else {
2219 cur->name = strdup(name);
2220 if (cur->name == NULL) {
2221 free(cur);
2222 result = -1;
2223 } else {
2224 struct variables *bottom = top_vars;
2225 cur->value = strdup(value);
2226 cur->next = NULL;
2227 cur->flg_export = flg_export;
2228 cur->flg_read_only = 0;
2229 while(bottom->next) bottom=bottom->next;
2230 bottom->next = cur;
2231 }
2232 }
2233 }
2234
2235 #ifndef __U_BOOT__
2236 if(result==0 && cur->flg_export==1) {
2237 *(value-1) = '=';
2238 result = putenv(name);
2239 } else {
2240 #endif
2241 free(name);
2242 #ifndef __U_BOOT__
2243 if(result>0) /* equivalent to previous set */
2244 result = 0;
2245 }
2246 #endif
2247 return result;
2248 }
2249
2250 void unset_local_var(const char *name)
2251 {
2252 struct variables *cur;
2253
2254 if (name) {
2255 for (cur = top_vars; cur; cur=cur->next) {
2256 if(strcmp(cur->name, name)==0)
2257 break;
2258 }
2259 if (cur != NULL) {
2260 struct variables *next = top_vars;
2261 if(cur->flg_read_only) {
2262 error_msg("%s: readonly variable", name);
2263 return;
2264 } else {
2265 #ifndef __U_BOOT__
2266 if(cur->flg_export)
2267 unenv_set(cur->name);
2268 #endif
2269 free(cur->name);
2270 free(cur->value);
2271 while (next->next != cur)
2272 next = next->next;
2273 next->next = cur->next;
2274 }
2275 free(cur);
2276 }
2277 }
2278 }
2279
2280 static int is_assignment(const char *s)
2281 {
2282 if (s == NULL)
2283 return 0;
2284
2285 if (!isalpha(*s)) return 0;
2286 ++s;
2287 while(isalnum(*s) || *s=='_') ++s;
2288 return *s=='=';
2289 }
2290
2291 #ifndef __U_BOOT__
2292 /* the src parameter allows us to peek forward to a possible &n syntax
2293 * for file descriptor duplication, e.g., "2>&1".
2294 * Return code is 0 normally, 1 if a syntax error is detected in src.
2295 * Resource errors (in xmalloc) cause the process to exit */
2296 static int setup_redirect(struct p_context *ctx, int fd, redir_type style,
2297 struct in_str *input)
2298 {
2299 struct child_prog *child=ctx->child;
2300 struct redir_struct *redir = child->redirects;
2301 struct redir_struct *last_redir=NULL;
2302
2303 /* Create a new redir_struct and drop it onto the end of the linked list */
2304 while(redir) {
2305 last_redir=redir;
2306 redir=redir->next;
2307 }
2308 redir = xmalloc(sizeof(struct redir_struct));
2309 redir->next=NULL;
2310 redir->word.gl_pathv=NULL;
2311 if (last_redir) {
2312 last_redir->next=redir;
2313 } else {
2314 child->redirects=redir;
2315 }
2316
2317 redir->type=style;
2318 redir->fd= (fd==-1) ? redir_table[style].default_fd : fd ;
2319
2320 debug_printf("Redirect type %d%s\n", redir->fd, redir_table[style].descrip);
2321
2322 /* Check for a '2>&1' type redirect */
2323 redir->dup = redirect_dup_num(input);
2324 if (redir->dup == -2) return 1; /* syntax error */
2325 if (redir->dup != -1) {
2326 /* Erik had a check here that the file descriptor in question
2327 * is legit; I postpone that to "run time"
2328 * A "-" representation of "close me" shows up as a -3 here */
2329 debug_printf("Duplicating redirect '%d>&%d'\n", redir->fd, redir->dup);
2330 } else {
2331 /* We do _not_ try to open the file that src points to,
2332 * since we need to return and let src be expanded first.
2333 * Set ctx->pending_redirect, so we know what to do at the
2334 * end of the next parsed word.
2335 */
2336 ctx->pending_redirect = redir;
2337 }
2338 return 0;
2339 }
2340 #endif
2341
2342 static struct pipe *new_pipe(void)
2343 {
2344 struct pipe *pi;
2345 pi = xmalloc(sizeof(struct pipe));
2346 pi->num_progs = 0;
2347 pi->progs = NULL;
2348 pi->next = NULL;
2349 pi->followup = 0; /* invalid */
2350 pi->r_mode = RES_NONE;
2351 return pi;
2352 }
2353
2354 static void initialize_context(struct p_context *ctx)
2355 {
2356 ctx->pipe=NULL;
2357 #ifndef __U_BOOT__
2358 ctx->pending_redirect=NULL;
2359 #endif
2360 ctx->child=NULL;
2361 ctx->list_head=new_pipe();
2362 ctx->pipe=ctx->list_head;
2363 ctx->w=RES_NONE;
2364 ctx->stack=NULL;
2365 #ifdef __U_BOOT__
2366 ctx->old_flag=0;
2367 #endif
2368 done_command(ctx); /* creates the memory for working child */
2369 }
2370
2371 /* normal return is 0
2372 * if a reserved word is found, and processed, return 1
2373 * should handle if, then, elif, else, fi, for, while, until, do, done.
2374 * case, function, and select are obnoxious, save those for later.
2375 */
2376 struct reserved_combo {
2377 char *literal;
2378 int code;
2379 long flag;
2380 };
2381 /* Mostly a list of accepted follow-up reserved words.
2382 * FLAG_END means we are done with the sequence, and are ready
2383 * to turn the compound list into a command.
2384 * FLAG_START means the word must start a new compound list.
2385 */
2386 static struct reserved_combo reserved_list[] = {
2387 { "if", RES_IF, FLAG_THEN | FLAG_START },
2388 { "then", RES_THEN, FLAG_ELIF | FLAG_ELSE | FLAG_FI },
2389 { "elif", RES_ELIF, FLAG_THEN },
2390 { "else", RES_ELSE, FLAG_FI },
2391 { "fi", RES_FI, FLAG_END },
2392 { "for", RES_FOR, FLAG_IN | FLAG_START },
2393 { "while", RES_WHILE, FLAG_DO | FLAG_START },
2394 { "until", RES_UNTIL, FLAG_DO | FLAG_START },
2395 { "in", RES_IN, FLAG_DO },
2396 { "do", RES_DO, FLAG_DONE },
2397 { "done", RES_DONE, FLAG_END }
2398 };
2399 #define NRES (sizeof(reserved_list)/sizeof(struct reserved_combo))
2400
2401 static int reserved_word(o_string *dest, struct p_context *ctx)
2402 {
2403 struct reserved_combo *r;
2404 for (r=reserved_list;
2405 r<reserved_list+NRES; r++) {
2406 if (strcmp(dest->data, r->literal) == 0) {
2407 debug_printf("found reserved word %s, code %d\n",r->literal,r->code);
2408 if (r->flag & FLAG_START) {
2409 struct p_context *new = xmalloc(sizeof(struct p_context));
2410 debug_printf("push stack\n");
2411 if (ctx->w == RES_IN || ctx->w == RES_FOR) {
2412 syntax();
2413 free(new);
2414 ctx->w = RES_SNTX;
2415 b_reset(dest);
2416 return 1;
2417 }
2418 *new = *ctx; /* physical copy */
2419 initialize_context(ctx);
2420 ctx->stack=new;
2421 } else if ( ctx->w == RES_NONE || ! (ctx->old_flag & (1<<r->code))) {
2422 syntax();
2423 ctx->w = RES_SNTX;
2424 b_reset(dest);
2425 return 1;
2426 }
2427 ctx->w=r->code;
2428 ctx->old_flag = r->flag;
2429 if (ctx->old_flag & FLAG_END) {
2430 struct p_context *old;
2431 debug_printf("pop stack\n");
2432 done_pipe(ctx,PIPE_SEQ);
2433 old = ctx->stack;
2434 old->child->group = ctx->list_head;
2435 #ifndef __U_BOOT__
2436 old->child->subshell = 0;
2437 #endif
2438 *ctx = *old; /* physical copy */
2439 free(old);
2440 }
2441 b_reset (dest);
2442 return 1;
2443 }
2444 }
2445 return 0;
2446 }
2447
2448 /* normal return is 0.
2449 * Syntax or xglob errors return 1. */
2450 static int done_word(o_string *dest, struct p_context *ctx)
2451 {
2452 struct child_prog *child=ctx->child;
2453 #ifndef __U_BOOT__
2454 glob_t *glob_target;
2455 int gr, flags = 0;
2456 #else
2457 char *str, *s;
2458 int argc, cnt;
2459 #endif
2460
2461 debug_printf("done_word: %s %p\n", dest->data, child);
2462 if (dest->length == 0 && !dest->nonnull) {
2463 debug_printf(" true null, ignored\n");
2464 return 0;
2465 }
2466 #ifndef __U_BOOT__
2467 if (ctx->pending_redirect) {
2468 glob_target = &ctx->pending_redirect->word;
2469 } else {
2470 #endif
2471 if (child->group) {
2472 syntax();
2473 return 1; /* syntax error, groups and arglists don't mix */
2474 }
2475 if (!child->argv && (ctx->type & FLAG_PARSE_SEMICOLON)) {
2476 debug_printf("checking %s for reserved-ness\n",dest->data);
2477 if (reserved_word(dest,ctx)) return ctx->w==RES_SNTX;
2478 }
2479 #ifndef __U_BOOT__
2480 glob_target = &child->glob_result;
2481 if (child->argv) flags |= GLOB_APPEND;
2482 #else
2483 for (cnt = 1, s = dest->data; s && *s; s++) {
2484 if (*s == '\\') s++;
2485 cnt++;
2486 }
2487 str = malloc(cnt);
2488 if (!str) return 1;
2489 if ( child->argv == NULL) {
2490 child->argc=0;
2491 }
2492 argc = ++child->argc;
2493 child->argv = realloc(child->argv, (argc+1)*sizeof(*child->argv));
2494 if (child->argv == NULL) {
2495 free(str);
2496 return 1;
2497 }
2498 child->argv_nonnull = realloc(child->argv_nonnull,
2499 (argc+1)*sizeof(*child->argv_nonnull));
2500 if (child->argv_nonnull == NULL) {
2501 free(str);
2502 return 1;
2503 }
2504 child->argv[argc-1]=str;
2505 child->argv_nonnull[argc-1] = dest->nonnull;
2506 child->argv[argc]=NULL;
2507 child->argv_nonnull[argc] = 0;
2508 for (s = dest->data; s && *s; s++,str++) {
2509 if (*s == '\\') s++;
2510 *str = *s;
2511 }
2512 *str = '\0';
2513 #endif
2514 #ifndef __U_BOOT__
2515 }
2516 gr = xglob(dest, flags, glob_target);
2517 if (gr != 0) return 1;
2518 #endif
2519
2520 b_reset(dest);
2521 #ifndef __U_BOOT__
2522 if (ctx->pending_redirect) {
2523 ctx->pending_redirect=NULL;
2524 if (glob_target->gl_pathc != 1) {
2525 error_msg("ambiguous redirect");
2526 return 1;
2527 }
2528 } else {
2529 child->argv = glob_target->gl_pathv;
2530 }
2531 #endif
2532 if (ctx->w == RES_FOR) {
2533 done_word(dest,ctx);
2534 done_pipe(ctx,PIPE_SEQ);
2535 }
2536 return 0;
2537 }
2538
2539 /* The only possible error here is out of memory, in which case
2540 * xmalloc exits. */
2541 static int done_command(struct p_context *ctx)
2542 {
2543 /* The child is really already in the pipe structure, so
2544 * advance the pipe counter and make a new, null child.
2545 * Only real trickiness here is that the uncommitted
2546 * child structure, to which ctx->child points, is not
2547 * counted in pi->num_progs. */
2548 struct pipe *pi=ctx->pipe;
2549 struct child_prog *prog=ctx->child;
2550
2551 if (prog && prog->group == NULL
2552 && prog->argv == NULL
2553 #ifndef __U_BOOT__
2554 && prog->redirects == NULL) {
2555 #else
2556 ) {
2557 #endif
2558 debug_printf("done_command: skipping null command\n");
2559 return 0;
2560 } else if (prog) {
2561 pi->num_progs++;
2562 debug_printf("done_command: num_progs incremented to %d\n",pi->num_progs);
2563 } else {
2564 debug_printf("done_command: initializing\n");
2565 }
2566 pi->progs = xrealloc(pi->progs, sizeof(*pi->progs) * (pi->num_progs+1));
2567
2568 prog = pi->progs + pi->num_progs;
2569 #ifndef __U_BOOT__
2570 prog->redirects = NULL;
2571 #endif
2572 prog->argv = NULL;
2573 prog->argv_nonnull = NULL;
2574 #ifndef __U_BOOT__
2575 prog->is_stopped = 0;
2576 #endif
2577 prog->group = NULL;
2578 #ifndef __U_BOOT__
2579 prog->glob_result.gl_pathv = NULL;
2580 prog->family = pi;
2581 #endif
2582 prog->sp = 0;
2583 ctx->child = prog;
2584 prog->type = ctx->type;
2585
2586 /* but ctx->pipe and ctx->list_head remain unchanged */
2587 return 0;
2588 }
2589
2590 static int done_pipe(struct p_context *ctx, pipe_style type)
2591 {
2592 struct pipe *new_p;
2593 done_command(ctx); /* implicit closure of previous command */
2594 debug_printf("done_pipe, type %d\n", type);
2595 ctx->pipe->followup = type;
2596 ctx->pipe->r_mode = ctx->w;
2597 new_p=new_pipe();
2598 ctx->pipe->next = new_p;
2599 ctx->pipe = new_p;
2600 ctx->child = NULL;
2601 done_command(ctx); /* set up new pipe to accept commands */
2602 return 0;
2603 }
2604
2605 #ifndef __U_BOOT__
2606 /* peek ahead in the in_str to find out if we have a "&n" construct,
2607 * as in "2>&1", that represents duplicating a file descriptor.
2608 * returns either -2 (syntax error), -1 (no &), or the number found.
2609 */
2610 static int redirect_dup_num(struct in_str *input)
2611 {
2612 int ch, d=0, ok=0;
2613 ch = b_peek(input);
2614 if (ch != '&') return -1;
2615
2616 b_getch(input); /* get the & */
2617 ch=b_peek(input);
2618 if (ch == '-') {
2619 b_getch(input);
2620 return -3; /* "-" represents "close me" */
2621 }
2622 while (isdigit(ch)) {
2623 d = d*10+(ch-'0');
2624 ok=1;
2625 b_getch(input);
2626 ch = b_peek(input);
2627 }
2628 if (ok) return d;
2629
2630 error_msg("ambiguous redirect");
2631 return -2;
2632 }
2633
2634 /* If a redirect is immediately preceded by a number, that number is
2635 * supposed to tell which file descriptor to redirect. This routine
2636 * looks for such preceding numbers. In an ideal world this routine
2637 * needs to handle all the following classes of redirects...
2638 * echo 2>foo # redirects fd 2 to file "foo", nothing passed to echo
2639 * echo 49>foo # redirects fd 49 to file "foo", nothing passed to echo
2640 * echo -2>foo # redirects fd 1 to file "foo", "-2" passed to echo
2641 * echo 49x>foo # redirects fd 1 to file "foo", "49x" passed to echo
2642 * A -1 output from this program means no valid number was found, so the
2643 * caller should use the appropriate default for this redirection.
2644 */
2645 static int redirect_opt_num(o_string *o)
2646 {
2647 int num;
2648
2649 if (o->length==0) return -1;
2650 for(num=0; num<o->length; num++) {
2651 if (!isdigit(*(o->data+num))) {
2652 return -1;
2653 }
2654 }
2655 /* reuse num (and save an int) */
2656 num=atoi(o->data);
2657 b_reset(o);
2658 return num;
2659 }
2660
2661 FILE *generate_stream_from_list(struct pipe *head)
2662 {
2663 FILE *pf;
2664 #if 1
2665 int pid, channel[2];
2666 if (pipe(channel)<0) perror_msg_and_die("pipe");
2667 pid=fork();
2668 if (pid<0) {
2669 perror_msg_and_die("fork");
2670 } else if (pid==0) {
2671 close(channel[0]);
2672 if (channel[1] != 1) {
2673 dup2(channel[1],1);
2674 close(channel[1]);
2675 }
2676 #if 0
2677 #define SURROGATE "surrogate response"
2678 write(1,SURROGATE,sizeof(SURROGATE));
2679 _exit(run_list(head));
2680 #else
2681 _exit(run_list_real(head)); /* leaks memory */
2682 #endif
2683 }
2684 debug_printf("forked child %d\n",pid);
2685 close(channel[1]);
2686 pf = fdopen(channel[0],"r");
2687 debug_printf("pipe on FILE *%p\n",pf);
2688 #else
2689 free_pipe_list(head,0);
2690 pf=popen("echo surrogate response","r");
2691 debug_printf("started fake pipe on FILE *%p\n",pf);
2692 #endif
2693 return pf;
2694 }
2695
2696 /* this version hacked for testing purposes */
2697 /* return code is exit status of the process that is run. */
2698 static int process_command_subs(o_string *dest, struct p_context *ctx, struct in_str *input, int subst_end)
2699 {
2700 int retcode;
2701 o_string result=NULL_O_STRING;
2702 struct p_context inner;
2703 FILE *p;
2704 struct in_str pipe_str;
2705 initialize_context(&inner);
2706
2707 /* recursion to generate command */
2708 retcode = parse_stream(&result, &inner, input, subst_end);
2709 if (retcode != 0) return retcode; /* syntax error or EOF */
2710 done_word(&result, &inner);
2711 done_pipe(&inner, PIPE_SEQ);
2712 b_free(&result);
2713
2714 p=generate_stream_from_list(inner.list_head);
2715 if (p==NULL) return 1;
2716 mark_open(fileno(p));
2717 setup_file_in_str(&pipe_str, p);
2718
2719 /* now send results of command back into original context */
2720 retcode = parse_stream(dest, ctx, &pipe_str, '\0');
2721 /* XXX In case of a syntax error, should we try to kill the child?
2722 * That would be tough to do right, so just read until EOF. */
2723 if (retcode == 1) {
2724 while (b_getch(&pipe_str)!=EOF) { /* discard */ };
2725 }
2726
2727 debug_printf("done reading from pipe, pclose()ing\n");
2728 /* This is the step that wait()s for the child. Should be pretty
2729 * safe, since we just read an EOF from its stdout. We could try
2730 * to better, by using wait(), and keeping track of background jobs
2731 * at the same time. That would be a lot of work, and contrary
2732 * to the KISS philosophy of this program. */
2733 mark_closed(fileno(p));
2734 retcode=pclose(p);
2735 free_pipe_list(inner.list_head,0);
2736 debug_printf("pclosed, retcode=%d\n",retcode);
2737 /* XXX this process fails to trim a single trailing newline */
2738 return retcode;
2739 }
2740
2741 static int parse_group(o_string *dest, struct p_context *ctx,
2742 struct in_str *input, int ch)
2743 {
2744 int rcode, endch=0;
2745 struct p_context sub;
2746 struct child_prog *child = ctx->child;
2747 if (child->argv) {
2748 syntax();
2749 return 1; /* syntax error, groups and arglists don't mix */
2750 }
2751 initialize_context(&sub);
2752 switch(ch) {
2753 case '(': endch=')'; child->subshell=1; break;
2754 case '{': endch='}'; break;
2755 default: syntax(); /* really logic error */
2756 }
2757 rcode=parse_stream(dest,&sub,input,endch);
2758 done_word(dest,&sub); /* finish off the final word in the subcontext */
2759 done_pipe(&sub, PIPE_SEQ); /* and the final command there, too */
2760 child->group = sub.list_head;
2761 return rcode;
2762 /* child remains "open", available for possible redirects */
2763 }
2764 #endif
2765
2766 /* basically useful version until someone wants to get fancier,
2767 * see the bash man page under "Parameter Expansion" */
2768 static char *lookup_param(char *src)
2769 {
2770 char *p;
2771 char *sep;
2772 char *default_val = NULL;
2773 int assign = 0;
2774 int expand_empty = 0;
2775
2776 if (!src)
2777 return NULL;
2778
2779 sep = strchr(src, ':');
2780
2781 if (sep) {
2782 *sep = '\0';
2783 if (*(sep + 1) == '-')
2784 default_val = sep+2;
2785 if (*(sep + 1) == '=') {
2786 default_val = sep+2;
2787 assign = 1;
2788 }
2789 if (*(sep + 1) == '+') {
2790 default_val = sep+2;
2791 expand_empty = 1;
2792 }
2793 }
2794
2795 p = env_get(src);
2796 if (!p)
2797 p = get_local_var(src);
2798
2799 if (!p || strlen(p) == 0) {
2800 p = default_val;
2801 if (assign) {
2802 char *var = malloc(strlen(src)+strlen(default_val)+2);
2803 if (var) {
2804 sprintf(var, "%s=%s", src, default_val);
2805 set_local_var(var, 0);
2806 }
2807 free(var);
2808 }
2809 } else if (expand_empty) {
2810 p += strlen(p);
2811 }
2812
2813 if (sep)
2814 *sep = ':';
2815
2816 return p;
2817 }
2818
2819 #ifdef __U_BOOT__
2820 static char *get_dollar_var(char ch)
2821 {
2822 static char buf[40];
2823
2824 buf[0] = '\0';
2825 switch (ch) {
2826 case '?':
2827 sprintf(buf, "%u", (unsigned int)last_return_code);
2828 break;
2829 default:
2830 return NULL;
2831 }
2832 return buf;
2833 }
2834 #endif
2835
2836 /* return code: 0 for OK, 1 for syntax error */
2837 static int handle_dollar(o_string *dest, struct p_context *ctx, struct in_str *input)
2838 {
2839 #ifndef __U_BOOT__
2840 int i, advance=0;
2841 #else
2842 int advance=0;
2843 #endif
2844 #ifndef __U_BOOT__
2845 char sep[]=" ";
2846 #endif
2847 int ch = input->peek(input); /* first character after the $ */
2848 debug_printf("handle_dollar: ch=%c\n",ch);
2849 if (isalpha(ch)) {
2850 b_addchr(dest, SPECIAL_VAR_SYMBOL);
2851 ctx->child->sp++;
2852 while(ch=b_peek(input),isalnum(ch) || ch=='_') {
2853 b_getch(input);
2854 b_addchr(dest,ch);
2855 }
2856 b_addchr(dest, SPECIAL_VAR_SYMBOL);
2857 #ifndef __U_BOOT__
2858 } else if (isdigit(ch)) {
2859 i = ch-'0'; /* XXX is $0 special? */
2860 if (i<global_argc) {
2861 parse_string(dest, ctx, global_argv[i]); /* recursion */
2862 }
2863 advance = 1;
2864 #endif
2865 } else switch (ch) {
2866 #ifndef __U_BOOT__
2867 case '$':
2868 b_adduint(dest,getpid());
2869 advance = 1;
2870 break;
2871 case '!':
2872 if (last_bg_pid > 0) b_adduint(dest, last_bg_pid);
2873 advance = 1;
2874 break;
2875 #endif
2876 case '?':
2877 #ifndef __U_BOOT__
2878 b_adduint(dest,last_return_code);
2879 #else
2880 ctx->child->sp++;
2881 b_addchr(dest, SPECIAL_VAR_SYMBOL);
2882 b_addchr(dest, '$');
2883 b_addchr(dest, '?');
2884 b_addchr(dest, SPECIAL_VAR_SYMBOL);
2885 #endif
2886 advance = 1;
2887 break;
2888 #ifndef __U_BOOT__
2889 case '#':
2890 b_adduint(dest,global_argc ? global_argc-1 : 0);
2891 advance = 1;
2892 break;
2893 #endif
2894 case '{':
2895 b_addchr(dest, SPECIAL_VAR_SYMBOL);
2896 ctx->child->sp++;
2897 b_getch(input);
2898 /* XXX maybe someone will try to escape the '}' */
2899 while(ch=b_getch(input),ch!=EOF && ch!='}') {
2900 b_addchr(dest,ch);
2901 }
2902 if (ch != '}') {
2903 syntax();
2904 return 1;
2905 }
2906 b_addchr(dest, SPECIAL_VAR_SYMBOL);
2907 break;
2908 #ifndef __U_BOOT__
2909 case '(':
2910 b_getch(input);
2911 process_command_subs(dest, ctx, input, ')');
2912 break;
2913 case '*':
2914 sep[0]=ifs[0];
2915 for (i=1; i<global_argc; i++) {
2916 parse_string(dest, ctx, global_argv[i]);
2917 if (i+1 < global_argc) parse_string(dest, ctx, sep);
2918 }
2919 break;
2920 case '@':
2921 case '-':
2922 case '_':
2923 /* still unhandled, but should be eventually */
2924 error_msg("unhandled syntax: $%c",ch);
2925 return 1;
2926 break;
2927 #endif
2928 default:
2929 b_addqchr(dest,'$',dest->quote);
2930 }
2931 /* Eat the character if the flag was set. If the compiler
2932 * is smart enough, we could substitute "b_getch(input);"
2933 * for all the "advance = 1;" above, and also end up with
2934 * a nice size-optimized program. Hah! That'll be the day.
2935 */
2936 if (advance) b_getch(input);
2937 return 0;
2938 }
2939
2940 #ifndef __U_BOOT__
2941 int parse_string(o_string *dest, struct p_context *ctx, const char *src)
2942 {
2943 struct in_str foo;
2944 setup_string_in_str(&foo, src);
2945 return parse_stream(dest, ctx, &foo, '\0');
2946 }
2947 #endif
2948
2949 /* return code is 0 for normal exit, 1 for syntax error */
2950 static int parse_stream(o_string *dest, struct p_context *ctx,
2951 struct in_str *input, int end_trigger)
2952 {
2953 unsigned int ch, m;
2954 #ifndef __U_BOOT__
2955 int redir_fd;
2956 redir_type redir_style;
2957 #endif
2958 int next;
2959
2960 /* Only double-quote state is handled in the state variable dest->quote.
2961 * A single-quote triggers a bypass of the main loop until its mate is
2962 * found. When recursing, quote state is passed in via dest->quote. */
2963
2964 debug_printf("parse_stream, end_trigger=%d\n",end_trigger);
2965 while ((ch=b_getch(input))!=EOF) {
2966 m = map[ch];
2967 #ifdef __U_BOOT__
2968 if (input->__promptme == 0) return 1;
2969 #endif
2970 next = (ch == '\n') ? 0 : b_peek(input);
2971
2972 debug_printf("parse_stream: ch=%c (%d) m=%d quote=%d - %c\n",
2973 ch >= ' ' ? ch : '.', ch, m,
2974 dest->quote, ctx->stack == NULL ? '*' : '.');
2975
2976 if (m==0 || ((m==1 || m==2) && dest->quote)) {
2977 b_addqchr(dest, ch, dest->quote);
2978 } else {
2979 if (m==2) { /* unquoted IFS */
2980 if (done_word(dest, ctx)) {
2981 return 1;
2982 }
2983 /* If we aren't performing a substitution, treat a newline as a
2984 * command separator. */
2985 if (end_trigger != '\0' && ch=='\n')
2986 done_pipe(ctx,PIPE_SEQ);
2987 }
2988 if (ch == end_trigger && !dest->quote && ctx->w==RES_NONE) {
2989 debug_printf("leaving parse_stream (triggered)\n");
2990 return 0;
2991 }
2992 #if 0
2993 if (ch=='\n') {
2994 /* Yahoo! Time to run with it! */
2995 done_pipe(ctx,PIPE_SEQ);
2996 run_list(ctx->list_head);
2997 initialize_context(ctx);
2998 }
2999 #endif
3000 if (m!=2) switch (ch) {
3001 case '#':
3002 if (dest->length == 0 && !dest->quote) {
3003 while(ch=b_peek(input),ch!=EOF && ch!='\n') { b_getch(input); }
3004 } else {
3005 b_addqchr(dest, ch, dest->quote);
3006 }
3007 break;
3008 case '\\':
3009 if (next == EOF) {
3010 syntax();
3011 return 1;
3012 }
3013 b_addqchr(dest, '\\', dest->quote);
3014 b_addqchr(dest, b_getch(input), dest->quote);
3015 break;
3016 case '$':
3017 if (handle_dollar(dest, ctx, input)!=0) return 1;
3018 break;
3019 case '\'':
3020 dest->nonnull = 1;
3021 while(ch=b_getch(input),ch!=EOF && ch!='\'') {
3022 #ifdef __U_BOOT__
3023 if(input->__promptme == 0) return 1;
3024 #endif
3025 b_addchr(dest,ch);
3026 }
3027 if (ch==EOF) {
3028 syntax();
3029 return 1;
3030 }
3031 break;
3032 case '"':
3033 dest->nonnull = 1;
3034 dest->quote = !dest->quote;
3035 break;
3036 #ifndef __U_BOOT__
3037 case '`':
3038 process_command_subs(dest, ctx, input, '`');
3039 break;
3040 case '>':
3041 redir_fd = redirect_opt_num(dest);
3042 done_word(dest, ctx);
3043 redir_style=REDIRECT_OVERWRITE;
3044 if (next == '>') {
3045 redir_style=REDIRECT_APPEND;
3046 b_getch(input);
3047 } else if (next == '(') {
3048 syntax(); /* until we support >(list) Process Substitution */
3049 return 1;
3050 }
3051 setup_redirect(ctx, redir_fd, redir_style, input);
3052 break;
3053 case '<':
3054 redir_fd = redirect_opt_num(dest);
3055 done_word(dest, ctx);
3056 redir_style=REDIRECT_INPUT;
3057 if (next == '<') {
3058 redir_style=REDIRECT_HEREIS;
3059 b_getch(input);
3060 } else if (next == '>') {
3061 redir_style=REDIRECT_IO;
3062 b_getch(input);
3063 } else if (next == '(') {
3064 syntax(); /* until we support <(list) Process Substitution */
3065 return 1;
3066 }
3067 setup_redirect(ctx, redir_fd, redir_style, input);
3068 break;
3069 #endif
3070 case ';':
3071 done_word(dest, ctx);
3072 done_pipe(ctx,PIPE_SEQ);
3073 break;
3074 case '&':
3075 done_word(dest, ctx);
3076 if (next=='&') {
3077 b_getch(input);
3078 done_pipe(ctx,PIPE_AND);
3079 } else {
3080 #ifndef __U_BOOT__
3081 done_pipe(ctx,PIPE_BG);
3082 #else
3083 syntax_err();
3084 return 1;
3085 #endif
3086 }
3087 break;
3088 case '|':
3089 done_word(dest, ctx);
3090 if (next=='|') {
3091 b_getch(input);
3092 done_pipe(ctx,PIPE_OR);
3093 } else {
3094 /* we could pick up a file descriptor choice here
3095 * with redirect_opt_num(), but bash doesn't do it.
3096 * "echo foo 2| cat" yields "foo 2". */
3097 #ifndef __U_BOOT__
3098 done_command(ctx);
3099 #else
3100 syntax_err();
3101 return 1;
3102 #endif
3103 }
3104 break;
3105 #ifndef __U_BOOT__
3106 case '(':
3107 case '{':
3108 if (parse_group(dest, ctx, input, ch)!=0) return 1;
3109 break;
3110 case ')':
3111 case '}':
3112 syntax(); /* Proper use of this character caught by end_trigger */
3113 return 1;
3114 break;
3115 #endif
3116 case SUBSTED_VAR_SYMBOL:
3117 dest->nonnull = 1;
3118 while (ch = b_getch(input), ch != EOF &&
3119 ch != SUBSTED_VAR_SYMBOL) {
3120 debug_printf("subst, pass=%d\n", ch);
3121 if (input->__promptme == 0)
3122 return 1;
3123 b_addchr(dest, ch);
3124 }
3125 debug_printf("subst, term=%d\n", ch);
3126 if (ch == EOF) {
3127 syntax();
3128 return 1;
3129 }
3130 break;
3131 default:
3132 syntax(); /* this is really an internal logic error */
3133 return 1;
3134 }
3135 }
3136 }
3137 /* complain if quote? No, maybe we just finished a command substitution
3138 * that was quoted. Example:
3139 * $ echo "`cat foo` plus more"
3140 * and we just got the EOF generated by the subshell that ran "cat foo"
3141 * The only real complaint is if we got an EOF when end_trigger != '\0',
3142 * that is, we were really supposed to get end_trigger, and never got
3143 * one before the EOF. Can't use the standard "syntax error" return code,
3144 * so that parse_stream_outer can distinguish the EOF and exit smoothly. */
3145 debug_printf("leaving parse_stream (EOF)\n");
3146 if (end_trigger != '\0') return -1;
3147 return 0;
3148 }
3149
3150 static void mapset(const unsigned char *set, int code)
3151 {
3152 const unsigned char *s;
3153 for (s=set; *s; s++) map[*s] = code;
3154 }
3155
3156 static void update_ifs_map(void)
3157 {
3158 /* char *ifs and char map[256] are both globals. */
3159 ifs = (uchar *)env_get("IFS");
3160 if (ifs == NULL) ifs=(uchar *)" \t\n";
3161 /* Precompute a list of 'flow through' behavior so it can be treated
3162 * quickly up front. Computation is necessary because of IFS.
3163 * Special case handling of IFS == " \t\n" is not implemented.
3164 * The map[] array only really needs two bits each, and on most machines
3165 * that would be faster because of the reduced L1 cache footprint.
3166 */
3167 memset(map,0,sizeof(map)); /* most characters flow through always */
3168 #ifndef __U_BOOT__
3169 mapset((uchar *)"\\$'\"`", 3); /* never flow through */
3170 mapset((uchar *)"<>;&|(){}#", 1); /* flow through if quoted */
3171 #else
3172 {
3173 uchar subst[2] = {SUBSTED_VAR_SYMBOL, 0};
3174 mapset(subst, 3); /* never flow through */
3175 }
3176 mapset((uchar *)"\\$'\"", 3); /* never flow through */
3177 mapset((uchar *)";&|#", 1); /* flow through if quoted */
3178 #endif
3179 mapset(ifs, 2); /* also flow through if quoted */
3180 }
3181
3182 /* most recursion does not come through here, the exeception is
3183 * from builtin_source() */
3184 static int parse_stream_outer(struct in_str *inp, int flag)
3185 {
3186
3187 struct p_context ctx;
3188 o_string temp=NULL_O_STRING;
3189 int rcode;
3190 #ifdef __U_BOOT__
3191 int code = 1;
3192 #endif
3193 do {
3194 ctx.type = flag;
3195 initialize_context(&ctx);
3196 update_ifs_map();
3197 if (!(flag & FLAG_PARSE_SEMICOLON) || (flag & FLAG_REPARSING)) mapset((uchar *)";$&|", 0);
3198 inp->promptmode=1;
3199 rcode = parse_stream(&temp, &ctx, inp,
3200 flag & FLAG_CONT_ON_NEWLINE ? -1 : '\n');
3201 #ifdef __U_BOOT__
3202 if (rcode == 1) flag_repeat = 0;
3203 #endif
3204 if (rcode != 1 && ctx.old_flag != 0) {
3205 syntax();
3206 #ifdef __U_BOOT__
3207 flag_repeat = 0;
3208 #endif
3209 }
3210 if (rcode != 1 && ctx.old_flag == 0) {
3211 done_word(&temp, &ctx);
3212 done_pipe(&ctx,PIPE_SEQ);
3213 #ifndef __U_BOOT__
3214 run_list(ctx.list_head);
3215 #else
3216 code = run_list(ctx.list_head);
3217 if (code == -2) { /* exit */
3218 b_free(&temp);
3219 code = 0;
3220 /* XXX hackish way to not allow exit from main loop */
3221 if (inp->peek == file_peek) {
3222 printf("exit not allowed from main input shell.\n");
3223 continue;
3224 }
3225 break;
3226 }
3227 if (code == -1)
3228 flag_repeat = 0;
3229 #endif
3230 } else {
3231 if (ctx.old_flag != 0) {
3232 free(ctx.stack);
3233 b_reset(&temp);
3234 }
3235 #ifdef __U_BOOT__
3236 if (inp->__promptme == 0) printf("<INTERRUPT>\n");
3237 inp->__promptme = 1;
3238 #endif
3239 temp.nonnull = 0;
3240 temp.quote = 0;
3241 inp->p = NULL;
3242 free_pipe_list(ctx.list_head,0);
3243 }
3244 b_free(&temp);
3245 /* loop on syntax errors, return on EOF */
3246 } while (rcode != -1 && !(flag & FLAG_EXIT_FROM_LOOP) &&
3247 (inp->peek != static_peek || b_peek(inp)));
3248 #ifndef __U_BOOT__
3249 return 0;
3250 #else
3251 return (code != 0) ? 1 : 0;
3252 #endif /* __U_BOOT__ */
3253 }
3254
3255 #ifndef __U_BOOT__
3256 static int parse_string_outer(const char *s, int flag)
3257 #else
3258 int parse_string_outer(const char *s, int flag)
3259 #endif /* __U_BOOT__ */
3260 {
3261 struct in_str input;
3262 #ifdef __U_BOOT__
3263 char *p = NULL;
3264 int rcode;
3265 if (!s)
3266 return 1;
3267 if (!*s)
3268 return 0;
3269 if (!(p = strchr(s, '\n')) || *++p) {
3270 p = xmalloc(strlen(s) + 2);
3271 strcpy(p, s);
3272 strcat(p, "\n");
3273 setup_string_in_str(&input, p);
3274 rcode = parse_stream_outer(&input, flag);
3275 free(p);
3276 return rcode;
3277 } else {
3278 #endif
3279 setup_string_in_str(&input, s);
3280 return parse_stream_outer(&input, flag);
3281 #ifdef __U_BOOT__
3282 }
3283 #endif
3284 }
3285
3286 #ifndef __U_BOOT__
3287 static int parse_file_outer(FILE *f)
3288 #else
3289 int parse_file_outer(void)
3290 #endif
3291 {
3292 int rcode;
3293 struct in_str input;
3294 #ifndef __U_BOOT__
3295 setup_file_in_str(&input, f);
3296 #else
3297 setup_file_in_str(&input);
3298 #endif
3299 rcode = parse_stream_outer(&input, FLAG_PARSE_SEMICOLON);
3300 return rcode;
3301 }
3302
3303 #ifdef __U_BOOT__
3304 #ifdef CONFIG_NEEDS_MANUAL_RELOC
3305 static void u_boot_hush_reloc(void)
3306 {
3307 unsigned long addr;
3308 struct reserved_combo *r;
3309
3310 for (r=reserved_list; r<reserved_list+NRES; r++) {
3311 addr = (ulong) (r->literal) + gd->reloc_off;
3312 r->literal = (char *)addr;
3313 }
3314 }
3315 #endif
3316
3317 int u_boot_hush_start(void)
3318 {
3319 if (top_vars == NULL) {
3320 top_vars = malloc(sizeof(struct variables));
3321 top_vars->name = "HUSH_VERSION";
3322 top_vars->value = "0.01";
3323 top_vars->next = NULL;
3324 top_vars->flg_export = 0;
3325 top_vars->flg_read_only = 1;
3326 #ifdef CONFIG_NEEDS_MANUAL_RELOC
3327 u_boot_hush_reloc();
3328 #endif
3329 }
3330 return 0;
3331 }
3332
3333 static void *xmalloc(size_t size)
3334 {
3335 void *p = NULL;
3336
3337 if (!(p = malloc(size))) {
3338 printf("ERROR : memory not allocated\n");
3339 for(;;);
3340 }
3341 return p;
3342 }
3343
3344 static void *xrealloc(void *ptr, size_t size)
3345 {
3346 void *p = NULL;
3347
3348 if (!(p = realloc(ptr, size))) {
3349 printf("ERROR : memory not allocated\n");
3350 for(;;);
3351 }
3352 return p;
3353 }
3354 #endif /* __U_BOOT__ */
3355
3356 #ifndef __U_BOOT__
3357 /* Make sure we have a controlling tty. If we get started under a job
3358 * aware app (like bash for example), make sure we are now in charge so
3359 * we don't fight over who gets the foreground */
3360 static void setup_job_control(void)
3361 {
3362 static pid_t shell_pgrp;
3363 /* Loop until we are in the foreground. */
3364 while (tcgetpgrp (shell_terminal) != (shell_pgrp = getpgrp ()))
3365 kill (- shell_pgrp, SIGTTIN);
3366
3367 /* Ignore interactive and job-control signals. */
3368 signal(SIGINT, SIG_IGN);
3369 signal(SIGQUIT, SIG_IGN);
3370 signal(SIGTERM, SIG_IGN);
3371 signal(SIGTSTP, SIG_IGN);
3372 signal(SIGTTIN, SIG_IGN);
3373 signal(SIGTTOU, SIG_IGN);
3374 signal(SIGCHLD, SIG_IGN);
3375
3376 /* Put ourselves in our own process group. */
3377 setsid();
3378 shell_pgrp = getpid ();
3379 setpgid (shell_pgrp, shell_pgrp);
3380
3381 /* Grab control of the terminal. */
3382 tcsetpgrp(shell_terminal, shell_pgrp);
3383 }
3384
3385 int hush_main(int argc, char * const *argv)
3386 {
3387 int opt;
3388 FILE *input;
3389 char **e = environ;
3390
3391 /* XXX what should these be while sourcing /etc/profile? */
3392 global_argc = argc;
3393 global_argv = argv;
3394
3395 /* (re?) initialize globals. Sometimes hush_main() ends up calling
3396 * hush_main(), therefore we cannot rely on the BSS to zero out this
3397 * stuff. Reset these to 0 every time. */
3398 ifs = NULL;
3399 /* map[] is taken care of with call to update_ifs_map() */
3400 fake_mode = 0;
3401 interactive = 0;
3402 close_me_head = NULL;
3403 last_bg_pid = 0;
3404 job_list = NULL;
3405 last_jobid = 0;
3406
3407 /* Initialize some more globals to non-zero values */
3408 set_cwd();
3409 #ifdef CONFIG_FEATURE_COMMAND_EDITING
3410 cmdedit_set_initial_prompt();
3411 #else
3412 PS1 = NULL;
3413 #endif
3414 PS2 = "> ";
3415
3416 /* initialize our shell local variables with the values
3417 * currently living in the environment */
3418 if (e) {
3419 for (; *e; e++)
3420 set_local_var(*e, 2); /* without call putenv() */
3421 }
3422
3423 last_return_code=EXIT_SUCCESS;
3424
3425
3426 if (argv[0] && argv[0][0] == '-') {
3427 debug_printf("\nsourcing /etc/profile\n");
3428 if ((input = fopen("/etc/profile", "r")) != NULL) {
3429 mark_open(fileno(input));
3430 parse_file_outer(input);
3431 mark_closed(fileno(input));
3432 fclose(input);
3433 }
3434 }
3435 input=stdin;
3436
3437 while ((opt = getopt(argc, argv, "c:xif")) > 0) {
3438 switch (opt) {
3439 case 'c':
3440 {
3441 global_argv = argv+optind;
3442 global_argc = argc-optind;
3443 opt = parse_string_outer(optarg, FLAG_PARSE_SEMICOLON);
3444 goto final_return;
3445 }
3446 break;
3447 case 'i':
3448 interactive++;
3449 break;
3450 case 'f':
3451 fake_mode++;
3452 break;
3453 default:
3454 #ifndef BB_VER
3455 fprintf(stderr, "Usage: sh [FILE]...\n"
3456 " or: sh -c command [args]...\n\n");
3457 exit(EXIT_FAILURE);
3458 #else
3459 show_usage();
3460 #endif
3461 }
3462 }
3463 /* A shell is interactive if the `-i' flag was given, or if all of
3464 * the following conditions are met:
3465 * no -c command
3466 * no arguments remaining or the -s flag given
3467 * standard input is a terminal
3468 * standard output is a terminal
3469 * Refer to Posix.2, the description of the `sh' utility. */
3470 if (argv[optind]==NULL && input==stdin &&
3471 isatty(fileno(stdin)) && isatty(fileno(stdout))) {
3472 interactive++;
3473 }
3474
3475 debug_printf("\ninteractive=%d\n", interactive);
3476 if (interactive) {
3477 /* Looks like they want an interactive shell */
3478 #ifndef CONFIG_FEATURE_SH_EXTRA_QUIET
3479 printf( "\n\n" BB_BANNER " hush - the humble shell v0.01 (testing)\n");
3480 printf( "Enter 'help' for a list of built-in commands.\n\n");
3481 #endif
3482 setup_job_control();
3483 }
3484
3485 if (argv[optind]==NULL) {
3486 opt=parse_file_outer(stdin);
3487 goto final_return;
3488 }
3489
3490 debug_printf("\nrunning script '%s'\n", argv[optind]);
3491 global_argv = argv+optind;
3492 global_argc = argc-optind;
3493 input = xfopen(argv[optind], "r");
3494 opt = parse_file_outer(input);
3495
3496 #ifdef CONFIG_FEATURE_CLEAN_UP
3497 fclose(input);
3498 if (cwd && cwd != unknown)
3499 free((char*)cwd);
3500 {
3501 struct variables *cur, *tmp;
3502 for(cur = top_vars; cur; cur = tmp) {
3503 tmp = cur->next;
3504 if (!cur->flg_read_only) {
3505 free(cur->name);
3506 free(cur->value);
3507 free(cur);
3508 }
3509 }
3510 }
3511 #endif
3512
3513 final_return:
3514 return(opt?opt:last_return_code);
3515 }
3516 #endif
3517
3518 static char *insert_var_value(char *inp)
3519 {
3520 return insert_var_value_sub(inp, 0);
3521 }
3522
3523 static char *insert_var_value_sub(char *inp, int tag_subst)
3524 {
3525 int res_str_len = 0;
3526 int len;
3527 int done = 0;
3528 char *p, *p1, *res_str = NULL;
3529
3530 while ((p = strchr(inp, SPECIAL_VAR_SYMBOL))) {
3531 /* check the beginning of the string for normal characters */
3532 if (p != inp) {
3533 /* copy any characters to the result string */
3534 len = p - inp;
3535 res_str = xrealloc(res_str, (res_str_len + len));
3536 strncpy((res_str + res_str_len), inp, len);
3537 res_str_len += len;
3538 }
3539 inp = ++p;
3540 /* find the ending marker */
3541 p = strchr(inp, SPECIAL_VAR_SYMBOL);
3542 *p = '\0';
3543 /* look up the value to substitute */
3544 if ((p1 = lookup_param(inp))) {
3545 if (tag_subst)
3546 len = res_str_len + strlen(p1) + 2;
3547 else
3548 len = res_str_len + strlen(p1);
3549 res_str = xrealloc(res_str, (1 + len));
3550 if (tag_subst) {
3551 /*
3552 * copy the variable value to the result
3553 * string
3554 */
3555 strcpy((res_str + res_str_len + 1), p1);
3556
3557 /*
3558 * mark the replaced text to be accepted as
3559 * is
3560 */
3561 res_str[res_str_len] = SUBSTED_VAR_SYMBOL;
3562 res_str[res_str_len + 1 + strlen(p1)] =
3563 SUBSTED_VAR_SYMBOL;
3564 } else
3565 /*
3566 * copy the variable value to the result
3567 * string
3568 */
3569 strcpy((res_str + res_str_len), p1);
3570
3571 res_str_len = len;
3572 }
3573 *p = SPECIAL_VAR_SYMBOL;
3574 inp = ++p;
3575 done = 1;
3576 }
3577 if (done) {
3578 res_str = xrealloc(res_str, (1 + res_str_len + strlen(inp)));
3579 strcpy((res_str + res_str_len), inp);
3580 while ((p = strchr(res_str, '\n'))) {
3581 *p = ' ';
3582 }
3583 }
3584 return (res_str == NULL) ? inp : res_str;
3585 }
3586
3587 static char **make_list_in(char **inp, char *name)
3588 {
3589 int len, i;
3590 int name_len = strlen(name);
3591 int n = 0;
3592 char **list;
3593 char *p1, *p2, *p3;
3594
3595 /* create list of variable values */
3596 list = xmalloc(sizeof(*list));
3597 for (i = 0; inp[i]; i++) {
3598 p3 = insert_var_value(inp[i]);
3599 p1 = p3;
3600 while (*p1) {
3601 if (*p1 == ' ') {
3602 p1++;
3603 continue;
3604 }
3605 if ((p2 = strchr(p1, ' '))) {
3606 len = p2 - p1;
3607 } else {
3608 len = strlen(p1);
3609 p2 = p1 + len;
3610 }
3611 /* we use n + 2 in realloc for list,because we add
3612 * new element and then we will add NULL element */
3613 list = xrealloc(list, sizeof(*list) * (n + 2));
3614 list[n] = xmalloc(2 + name_len + len);
3615 strcpy(list[n], name);
3616 strcat(list[n], "=");
3617 strncat(list[n], p1, len);
3618 list[n++][name_len + len + 1] = '\0';
3619 p1 = p2;
3620 }
3621 if (p3 != inp[i]) free(p3);
3622 }
3623 list[n] = NULL;
3624 return list;
3625 }
3626
3627 /*
3628 * Make new string for parser
3629 * inp - array of argument strings to flatten
3630 * nonnull - indicates argument was quoted when originally parsed
3631 */
3632 static char *make_string(char **inp, int *nonnull)
3633 {
3634 char *p;
3635 char *str = NULL;
3636 int n;
3637 int len = 2;
3638 char *noeval_str;
3639 int noeval = 0;
3640
3641 noeval_str = get_local_var("HUSH_NO_EVAL");
3642 if (noeval_str != NULL && *noeval_str != '0' && *noeval_str != '\0')
3643 noeval = 1;
3644 for (n = 0; inp[n]; n++) {
3645 p = insert_var_value_sub(inp[n], noeval);
3646 str = xrealloc(str, (len + strlen(p) + (2 * nonnull[n])));
3647 if (n) {
3648 strcat(str, " ");
3649 } else {
3650 *str = '\0';
3651 }
3652 if (nonnull[n])
3653 strcat(str, "'");
3654 strcat(str, p);
3655 if (nonnull[n])
3656 strcat(str, "'");
3657 len = strlen(str) + 3;
3658 if (p != inp[n]) free(p);
3659 }
3660 len = strlen(str);
3661 *(str + len) = '\n';
3662 *(str + len + 1) = '\0';
3663 return str;
3664 }
3665
3666 #ifdef __U_BOOT__
3667 static int do_showvar(cmd_tbl_t *cmdtp, int flag, int argc,
3668 char * const argv[])
3669 {
3670 int i, k;
3671 int rcode = 0;
3672 struct variables *cur;
3673
3674 if (argc == 1) { /* Print all env variables */
3675 for (cur = top_vars; cur; cur = cur->next) {
3676 printf ("%s=%s\n", cur->name, cur->value);
3677 if (ctrlc ()) {
3678 puts ("\n ** Abort\n");
3679 return 1;
3680 }
3681 }
3682 return 0;
3683 }
3684 for (i = 1; i < argc; ++i) { /* print single env variables */
3685 char *name = argv[i];
3686
3687 k = -1;
3688 for (cur = top_vars; cur; cur = cur->next) {
3689 if(strcmp (cur->name, name) == 0) {
3690 k = 0;
3691 printf ("%s=%s\n", cur->name, cur->value);
3692 }
3693 if (ctrlc ()) {
3694 puts ("\n ** Abort\n");
3695 return 1;
3696 }
3697 }
3698 if (k < 0) {
3699 printf ("## Error: \"%s\" not defined\n", name);
3700 rcode ++;
3701 }
3702 }
3703 return rcode;
3704 }
3705
3706 U_BOOT_CMD(
3707 showvar, CONFIG_SYS_MAXARGS, 1, do_showvar,
3708 "print local hushshell variables",
3709 "\n - print values of all hushshell variables\n"
3710 "showvar name ...\n"
3711 " - print value of hushshell variable 'name'"
3712 );
3713
3714 #endif
3715 /****************************************************************************/
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