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 <common.h> /* readline */
79 #include <env.h>
80 #include <malloc.h> /* malloc, free, realloc*/
81 #include <linux/ctype.h> /* isalpha, isdigit */
82 #include <console.h>
83 #include <bootretry.h>
84 #include <cli.h>
85 #include <cli_hush.h>
86 #include <command.h> /* find_cmd */
87 #ifndef CONFIG_SYS_PROMPT_HUSH_PS2
88 #define CONFIG_SYS_PROMPT_HUSH_PS2 "> "
89 #endif
90 #endif
91 #ifndef __U_BOOT__
92 #include <ctype.h> /* isalpha, isdigit */
93 #include <unistd.h> /* getpid */
94 #include <stdlib.h> /* getenv, atoi */
95 #include <string.h> /* strchr */
96 #include <stdio.h> /* popen etc. */
97 #include <glob.h> /* glob, of course */
98 #include <stdarg.h> /* va_list */
99 #include <errno.h>
100 #include <fcntl.h>
101 #include <getopt.h> /* should be pretty obvious */
102
103 #include <sys/stat.h> /* ulimit */
104 #include <sys/types.h>
105 #include <sys/wait.h>
106 #include <signal.h>
107
108 /* #include <dmalloc.h> */
109
110 #if 1
111 #include "busybox.h"
112 #include "cmdedit.h"
113 #else
114 #define applet_name "hush"
115 #include "standalone.h"
116 #define hush_main main
117 #undef CONFIG_FEATURE_SH_FANCY_PROMPT
118 #define BB_BANNER
119 #endif
120 #endif
121 #define SPECIAL_VAR_SYMBOL 03
122 #define SUBSTED_VAR_SYMBOL 04
123 #ifndef __U_BOOT__
124 #define FLAG_EXIT_FROM_LOOP 1
125 #define FLAG_PARSE_SEMICOLON (1 << 1) /* symbol ';' is special for parser */
126 #define FLAG_REPARSING (1 << 2) /* >= 2nd pass */
127
128 #endif
129
130 #ifdef __U_BOOT__
131 DECLARE_GLOBAL_DATA_PTR;
132
133 #define EXIT_SUCCESS 0
134 #define EOF -1
135 #define syntax() syntax_err()
136 #define xstrdup strdup
137 #define error_msg printf
138 #else
139 typedef enum {
140 REDIRECT_INPUT = 1,
141 REDIRECT_OVERWRITE = 2,
142 REDIRECT_APPEND = 3,
143 REDIRECT_HEREIS = 4,
144 REDIRECT_IO = 5
145 } redir_type;
146
147 /* The descrip member of this structure is only used to make debugging
148 * output pretty */
149 struct {int mode; int default_fd; char *descrip;} redir_table[] = {
150 { 0, 0, "()" },
151 { O_RDONLY, 0, "<" },
152 { O_CREAT|O_TRUNC|O_WRONLY, 1, ">" },
153 { O_CREAT|O_APPEND|O_WRONLY, 1, ">>" },
154 { O_RDONLY, -1, "<<" },
155 { O_RDWR, 1, "<>" }
156 };
157 #endif
158
159 typedef enum {
160 PIPE_SEQ = 1,
161 PIPE_AND = 2,
162 PIPE_OR = 3,
163 PIPE_BG = 4,
164 } pipe_style;
165
166 /* might eventually control execution */
167 typedef enum {
168 RES_NONE = 0,
169 RES_IF = 1,
170 RES_THEN = 2,
171 RES_ELIF = 3,
172 RES_ELSE = 4,
173 RES_FI = 5,
174 RES_FOR = 6,
175 RES_WHILE = 7,
176 RES_UNTIL = 8,
177 RES_DO = 9,
178 RES_DONE = 10,
179 RES_XXXX = 11,
180 RES_IN = 12,
181 RES_SNTX = 13
182 } reserved_style;
183 #define FLAG_END (1<<RES_NONE)
184 #define FLAG_IF (1<<RES_IF)
185 #define FLAG_THEN (1<<RES_THEN)
186 #define FLAG_ELIF (1<<RES_ELIF)
187 #define FLAG_ELSE (1<<RES_ELSE)
188 #define FLAG_FI (1<<RES_FI)
189 #define FLAG_FOR (1<<RES_FOR)
190 #define FLAG_WHILE (1<<RES_WHILE)
191 #define FLAG_UNTIL (1<<RES_UNTIL)
192 #define FLAG_DO (1<<RES_DO)
193 #define FLAG_DONE (1<<RES_DONE)
194 #define FLAG_IN (1<<RES_IN)
195 #define FLAG_START (1<<RES_XXXX)
196
197 /* This holds pointers to the various results of parsing */
198 struct p_context {
199 struct child_prog *child;
200 struct pipe *list_head;
201 struct pipe *pipe;
202 #ifndef __U_BOOT__
203 struct redir_struct *pending_redirect;
204 #endif
205 reserved_style w;
206 int old_flag; /* for figuring out valid reserved words */
207 struct p_context *stack;
208 int type; /* define type of parser : ";$" common or special symbol */
209 /* How about quoting status? */
210 };
211
212 #ifndef __U_BOOT__
213 struct redir_struct {
214 redir_type type; /* type of redirection */
215 int fd; /* file descriptor being redirected */
216 int dup; /* -1, or file descriptor being duplicated */
217 struct redir_struct *next; /* pointer to the next redirect in the list */
218 glob_t word; /* *word.gl_pathv is the filename */
219 };
220 #endif
221
222 struct child_prog {
223 #ifndef __U_BOOT__
224 pid_t pid; /* 0 if exited */
225 #endif
226 char **argv; /* program name and arguments */
227 /* was quoted when parsed; copy of struct o_string.nonnull field */
228 int *argv_nonnull;
229 #ifdef __U_BOOT__
230 int argc; /* number of program arguments */
231 #endif
232 struct pipe *group; /* if non-NULL, first in group or subshell */
233 #ifndef __U_BOOT__
234 int subshell; /* flag, non-zero if group must be forked */
235 struct redir_struct *redirects; /* I/O redirections */
236 glob_t glob_result; /* result of parameter globbing */
237 int is_stopped; /* is the program currently running? */
238 struct pipe *family; /* pointer back to the child's parent pipe */
239 #endif
240 int sp; /* number of SPECIAL_VAR_SYMBOL */
241 int type;
242 };
243
244 struct pipe {
245 #ifndef __U_BOOT__
246 int jobid; /* job number */
247 #endif
248 int num_progs; /* total number of programs in job */
249 #ifndef __U_BOOT__
250 int running_progs; /* number of programs running */
251 char *text; /* name of job */
252 char *cmdbuf; /* buffer various argv's point into */
253 pid_t pgrp; /* process group ID for the job */
254 #endif
255 struct child_prog *progs; /* array of commands in pipe */
256 struct pipe *next; /* to track background commands */
257 #ifndef __U_BOOT__
258 int stopped_progs; /* number of programs alive, but stopped */
259 int job_context; /* bitmask defining current context */
260 #endif
261 pipe_style followup; /* PIPE_BG, PIPE_SEQ, PIPE_OR, PIPE_AND */
262 reserved_style r_mode; /* supports if, for, while, until */
263 };
264
265 #ifndef __U_BOOT__
266 struct close_me {
267 int fd;
268 struct close_me *next;
269 };
270 #endif
271
272 struct variables {
273 char *name;
274 char *value;
275 int flg_export;
276 int flg_read_only;
277 struct variables *next;
278 };
279
280 /* globals, connect us to the outside world
281 * the first three support $?, $#, and $1 */
282 #ifndef __U_BOOT__
283 char **global_argv;
284 unsigned int global_argc;
285 #endif
286 static unsigned int last_return_code;
287 #ifndef __U_BOOT__
288 extern char **environ; /* This is in <unistd.h>, but protected with __USE_GNU */
289 #endif
290
291 /* "globals" within this file */
292 static uchar *ifs;
293 static char map[256];
294 #ifndef __U_BOOT__
295 static int fake_mode;
296 static int interactive;
297 static struct close_me *close_me_head;
298 static const char *cwd;
299 static struct pipe *job_list;
300 static unsigned int last_bg_pid;
301 static unsigned int last_jobid;
302 static unsigned int shell_terminal;
303 static char *PS1;
304 static char *PS2;
305 struct variables shell_ver = { "HUSH_VERSION", "0.01", 1, 1, 0 };
306 struct variables *top_vars = &shell_ver;
307 #else
308 static int flag_repeat = 0;
309 static int do_repeat = 0;
310 static struct variables *top_vars = NULL ;
311 #endif /*__U_BOOT__ */
312
313 #define B_CHUNK (100)
314 #define B_NOSPAC 1
315
316 typedef struct {
317 char *data;
318 int length;
319 int maxlen;
320 int quote;
321 int nonnull;
322 } o_string;
323 #define NULL_O_STRING {NULL,0,0,0,0}
324 /* used for initialization:
325 o_string foo = NULL_O_STRING; */
326
327 /* I can almost use ordinary FILE *. Is open_memstream() universally
328 * available? Where is it documented? */
329 struct in_str {
330 const char *p;
331 #ifndef __U_BOOT__
332 char peek_buf[2];
333 #endif
334 int __promptme;
335 int promptmode;
336 #ifndef __U_BOOT__
337 FILE *file;
338 #endif
339 int (*get) (struct in_str *);
340 int (*peek) (struct in_str *);
341 };
342 #define b_getch(input) ((input)->get(input))
343 #define b_peek(input) ((input)->peek(input))
344
345 #ifndef __U_BOOT__
346 #define JOB_STATUS_FORMAT "[%d] %-22s %.40s\n"
347
348 struct built_in_command {
349 char *cmd; /* name */
350 char *descr; /* description */
351 int (*function) (struct child_prog *); /* function ptr */
352 };
353 #endif
354
355 /* define DEBUG_SHELL for debugging output (obviously ;-)) */
356 #if 0
357 #define DEBUG_SHELL
358 #endif
359
360 /* This should be in utility.c */
361 #ifdef DEBUG_SHELL
362 #ifndef __U_BOOT__
debug_printf(const char * format,...)363 static void debug_printf(const char *format, ...)
364 {
365 va_list args;
366 va_start(args, format);
367 vfprintf(stderr, format, args);
368 va_end(args);
369 }
370 #else
371 #define debug_printf(fmt,args...) printf (fmt ,##args)
372 #endif
373 #else
debug_printf(const char * format,...)374 static inline void debug_printf(const char *format, ...) { }
375 #endif
376 #define final_printf debug_printf
377
378 #ifdef __U_BOOT__
syntax_err(void)379 static void syntax_err(void) {
380 printf("syntax error\n");
381 }
382 #else
__syntax(char * file,int line)383 static void __syntax(char *file, int line) {
384 error_msg("syntax error %s:%d", file, line);
385 }
386 #define syntax() __syntax(__FILE__, __LINE__)
387 #endif
388
389 #ifdef __U_BOOT__
390 static void *xmalloc(size_t size);
391 static void *xrealloc(void *ptr, size_t size);
392 #else
393 /* Index of subroutines: */
394 /* function prototypes for builtins */
395 static int builtin_cd(struct child_prog *child);
396 static int builtin_env(struct child_prog *child);
397 static int builtin_eval(struct child_prog *child);
398 static int builtin_exec(struct child_prog *child);
399 static int builtin_exit(struct child_prog *child);
400 static int builtin_export(struct child_prog *child);
401 static int builtin_fg_bg(struct child_prog *child);
402 static int builtin_help(struct child_prog *child);
403 static int builtin_jobs(struct child_prog *child);
404 static int builtin_pwd(struct child_prog *child);
405 static int builtin_read(struct child_prog *child);
406 static int builtin_set(struct child_prog *child);
407 static int builtin_shift(struct child_prog *child);
408 static int builtin_source(struct child_prog *child);
409 static int builtin_umask(struct child_prog *child);
410 static int builtin_unset(struct child_prog *child);
411 static int builtin_not_written(struct child_prog *child);
412 #endif
413 /* o_string manipulation: */
414 static int b_check_space(o_string *o, int len);
415 static int b_addchr(o_string *o, int ch);
416 static void b_reset(o_string *o);
417 static int b_addqchr(o_string *o, int ch, int quote);
418 #ifndef __U_BOOT__
419 static int b_adduint(o_string *o, unsigned int i);
420 #endif
421 /* in_str manipulations: */
422 static int static_get(struct in_str *i);
423 static int static_peek(struct in_str *i);
424 static int file_get(struct in_str *i);
425 static int file_peek(struct in_str *i);
426 #ifndef __U_BOOT__
427 static void setup_file_in_str(struct in_str *i, FILE *f);
428 #else
429 static void setup_file_in_str(struct in_str *i);
430 #endif
431 static void setup_string_in_str(struct in_str *i, const char *s);
432 #ifndef __U_BOOT__
433 /* close_me manipulations: */
434 static void mark_open(int fd);
435 static void mark_closed(int fd);
436 static void close_all(void);
437 #endif
438 /* "run" the final data structures: */
439 static char *indenter(int i);
440 static int free_pipe_list(struct pipe *head, int indent);
441 static int free_pipe(struct pipe *pi, int indent);
442 /* really run the final data structures: */
443 #ifndef __U_BOOT__
444 static int setup_redirects(struct child_prog *prog, int squirrel[]);
445 #endif
446 static int run_list_real(struct pipe *pi);
447 #ifndef __U_BOOT__
448 static void pseudo_exec(struct child_prog *child) __attribute__ ((noreturn));
449 #endif
450 static int run_pipe_real(struct pipe *pi);
451 /* extended glob support: */
452 #ifndef __U_BOOT__
453 static int globhack(const char *src, int flags, glob_t *pglob);
454 static int glob_needed(const char *s);
455 static int xglob(o_string *dest, int flags, glob_t *pglob);
456 #endif
457 /* variable assignment: */
458 static int is_assignment(const char *s);
459 /* data structure manipulation: */
460 #ifndef __U_BOOT__
461 static int setup_redirect(struct p_context *ctx, int fd, redir_type style, struct in_str *input);
462 #endif
463 static void initialize_context(struct p_context *ctx);
464 static int done_word(o_string *dest, struct p_context *ctx);
465 static int done_command(struct p_context *ctx);
466 static int done_pipe(struct p_context *ctx, pipe_style type);
467 /* primary string parsing: */
468 #ifndef __U_BOOT__
469 static int redirect_dup_num(struct in_str *input);
470 static int redirect_opt_num(o_string *o);
471 static int process_command_subs(o_string *dest, struct p_context *ctx, struct in_str *input, int subst_end);
472 static int parse_group(o_string *dest, struct p_context *ctx, struct in_str *input, int ch);
473 #endif
474 static char *lookup_param(char *src);
475 static char *make_string(char **inp, int *nonnull);
476 static int handle_dollar(o_string *dest, struct p_context *ctx, struct in_str *input);
477 #ifndef __U_BOOT__
478 static int parse_string(o_string *dest, struct p_context *ctx, const char *src);
479 #endif
480 static int parse_stream(o_string *dest, struct p_context *ctx, struct in_str *input0, int end_trigger);
481 /* setup: */
482 static int parse_stream_outer(struct in_str *inp, int flag);
483 #ifndef __U_BOOT__
484 static int parse_string_outer(const char *s, int flag);
485 static int parse_file_outer(FILE *f);
486 #endif
487 #ifndef __U_BOOT__
488 /* job management: */
489 static int checkjobs(struct pipe* fg_pipe);
490 static void insert_bg_job(struct pipe *pi);
491 static void remove_bg_job(struct pipe *pi);
492 #endif
493 /* local variable support */
494 static char **make_list_in(char **inp, char *name);
495 static char *insert_var_value(char *inp);
496 static char *insert_var_value_sub(char *inp, int tag_subst);
497
498 #ifndef __U_BOOT__
499 /* Table of built-in functions. They can be forked or not, depending on
500 * context: within pipes, they fork. As simple commands, they do not.
501 * When used in non-forking context, they can change global variables
502 * in the parent shell process. If forked, of course they can not.
503 * For example, 'unset foo | whatever' will parse and run, but foo will
504 * still be set at the end. */
505 static struct built_in_command bltins[] = {
506 {"bg", "Resume a job in the background", builtin_fg_bg},
507 {"break", "Exit for, while or until loop", builtin_not_written},
508 {"cd", "Change working directory", builtin_cd},
509 {"continue", "Continue for, while or until loop", builtin_not_written},
510 {"env", "Print all environment variables", builtin_env},
511 {"eval", "Construct and run shell command", builtin_eval},
512 {"exec", "Exec command, replacing this shell with the exec'd process",
513 builtin_exec},
514 {"exit", "Exit from shell()", builtin_exit},
515 {"export", "Set environment variable", builtin_export},
516 {"fg", "Bring job into the foreground", builtin_fg_bg},
517 {"jobs", "Lists the active jobs", builtin_jobs},
518 {"pwd", "Print current directory", builtin_pwd},
519 {"read", "Input environment variable", builtin_read},
520 {"return", "Return from a function", builtin_not_written},
521 {"set", "Set/unset shell local variables", builtin_set},
522 {"shift", "Shift positional parameters", builtin_shift},
523 {"trap", "Trap signals", builtin_not_written},
524 {"ulimit","Controls resource limits", builtin_not_written},
525 {"umask","Sets file creation mask", builtin_umask},
526 {"unset", "Unset environment variable", builtin_unset},
527 {".", "Source-in and run commands in a file", builtin_source},
528 {"help", "List shell built-in commands", builtin_help},
529 {NULL, NULL, NULL}
530 };
531
set_cwd(void)532 static const char *set_cwd(void)
533 {
534 if(cwd==unknown)
535 cwd = NULL; /* xgetcwd(arg) called free(arg) */
536 cwd = xgetcwd((char *)cwd);
537 if (!cwd)
538 cwd = unknown;
539 return cwd;
540 }
541
542 /* built-in 'eval' handler */
builtin_eval(struct child_prog * child)543 static int builtin_eval(struct child_prog *child)
544 {
545 char *str = NULL;
546 int rcode = EXIT_SUCCESS;
547
548 if (child->argv[1]) {
549 str = make_string(child->argv + 1);
550 parse_string_outer(str, FLAG_EXIT_FROM_LOOP |
551 FLAG_PARSE_SEMICOLON);
552 free(str);
553 rcode = last_return_code;
554 }
555 return rcode;
556 }
557
558 /* built-in 'cd <path>' handler */
builtin_cd(struct child_prog * child)559 static int builtin_cd(struct child_prog *child)
560 {
561 char *newdir;
562 if (child->argv[1] == NULL)
563 newdir = env_get("HOME");
564 else
565 newdir = child->argv[1];
566 if (chdir(newdir)) {
567 printf("cd: %s: %s\n", newdir, strerror(errno));
568 return EXIT_FAILURE;
569 }
570 set_cwd();
571 return EXIT_SUCCESS;
572 }
573
574 /* built-in 'env' handler */
builtin_env(struct child_prog * dummy)575 static int builtin_env(struct child_prog *dummy)
576 {
577 char **e = environ;
578 if (e == NULL) return EXIT_FAILURE;
579 for (; *e; e++) {
580 puts(*e);
581 }
582 return EXIT_SUCCESS;
583 }
584
585 /* built-in 'exec' handler */
builtin_exec(struct child_prog * child)586 static int builtin_exec(struct child_prog *child)
587 {
588 if (child->argv[1] == NULL)
589 return EXIT_SUCCESS; /* Really? */
590 child->argv++;
591 pseudo_exec(child);
592 /* never returns */
593 }
594
595 /* built-in 'exit' handler */
builtin_exit(struct child_prog * child)596 static int builtin_exit(struct child_prog *child)
597 {
598 if (child->argv[1] == NULL)
599 exit(last_return_code);
600 exit (atoi(child->argv[1]));
601 }
602
603 /* built-in 'export VAR=value' handler */
builtin_export(struct child_prog * child)604 static int builtin_export(struct child_prog *child)
605 {
606 int res = 0;
607 char *name = child->argv[1];
608
609 if (name == NULL) {
610 return (builtin_env(child));
611 }
612
613 name = strdup(name);
614
615 if(name) {
616 char *value = strchr(name, '=');
617
618 if (!value) {
619 char *tmp;
620 /* They are exporting something without an =VALUE */
621
622 value = get_local_var(name);
623 if (value) {
624 size_t ln = strlen(name);
625
626 tmp = realloc(name, ln+strlen(value)+2);
627 if(tmp==NULL)
628 res = -1;
629 else {
630 sprintf(tmp+ln, "=%s", value);
631 name = tmp;
632 }
633 } else {
634 /* bash does not return an error when trying to export
635 * an undefined variable. Do likewise. */
636 res = 1;
637 }
638 }
639 }
640 if (res<0)
641 perror_msg("export");
642 else if(res==0)
643 res = set_local_var(name, 1);
644 else
645 res = 0;
646 free(name);
647 return res;
648 }
649
650 /* built-in 'fg' and 'bg' handler */
builtin_fg_bg(struct child_prog * child)651 static int builtin_fg_bg(struct child_prog *child)
652 {
653 int i, jobnum;
654 struct pipe *pi=NULL;
655
656 if (!interactive)
657 return EXIT_FAILURE;
658 /* If they gave us no args, assume they want the last backgrounded task */
659 if (!child->argv[1]) {
660 for (pi = job_list; pi; pi = pi->next) {
661 if (pi->jobid == last_jobid) {
662 break;
663 }
664 }
665 if (!pi) {
666 error_msg("%s: no current job", child->argv[0]);
667 return EXIT_FAILURE;
668 }
669 } else {
670 if (sscanf(child->argv[1], "%%%d", &jobnum) != 1) {
671 error_msg("%s: bad argument '%s'", child->argv[0], child->argv[1]);
672 return EXIT_FAILURE;
673 }
674 for (pi = job_list; pi; pi = pi->next) {
675 if (pi->jobid == jobnum) {
676 break;
677 }
678 }
679 if (!pi) {
680 error_msg("%s: %d: no such job", child->argv[0], jobnum);
681 return EXIT_FAILURE;
682 }
683 }
684
685 if (*child->argv[0] == 'f') {
686 /* Put the job into the foreground. */
687 tcsetpgrp(shell_terminal, pi->pgrp);
688 }
689
690 /* Restart the processes in the job */
691 for (i = 0; i < pi->num_progs; i++)
692 pi->progs[i].is_stopped = 0;
693
694 if ( (i=kill(- pi->pgrp, SIGCONT)) < 0) {
695 if (i == ESRCH) {
696 remove_bg_job(pi);
697 } else {
698 perror_msg("kill (SIGCONT)");
699 }
700 }
701
702 pi->stopped_progs = 0;
703 return EXIT_SUCCESS;
704 }
705
706 /* built-in 'help' handler */
builtin_help(struct child_prog * dummy)707 static int builtin_help(struct child_prog *dummy)
708 {
709 struct built_in_command *x;
710
711 printf("\nBuilt-in commands:\n");
712 printf("-------------------\n");
713 for (x = bltins; x->cmd; x++) {
714 if (x->descr==NULL)
715 continue;
716 printf("%s\t%s\n", x->cmd, x->descr);
717 }
718 printf("\n\n");
719 return EXIT_SUCCESS;
720 }
721
722 /* built-in 'jobs' handler */
builtin_jobs(struct child_prog * child)723 static int builtin_jobs(struct child_prog *child)
724 {
725 struct pipe *job;
726 char *status_string;
727
728 for (job = job_list; job; job = job->next) {
729 if (job->running_progs == job->stopped_progs)
730 status_string = "Stopped";
731 else
732 status_string = "Running";
733
734 printf(JOB_STATUS_FORMAT, job->jobid, status_string, job->text);
735 }
736 return EXIT_SUCCESS;
737 }
738
739
740 /* built-in 'pwd' handler */
builtin_pwd(struct child_prog * dummy)741 static int builtin_pwd(struct child_prog *dummy)
742 {
743 puts(set_cwd());
744 return EXIT_SUCCESS;
745 }
746
747 /* built-in 'read VAR' handler */
builtin_read(struct child_prog * child)748 static int builtin_read(struct child_prog *child)
749 {
750 int res;
751
752 if (child->argv[1]) {
753 char string[BUFSIZ];
754 char *var = 0;
755
756 string[0] = 0; /* In case stdin has only EOF */
757 /* read string */
758 fgets(string, sizeof(string), stdin);
759 chomp(string);
760 var = malloc(strlen(child->argv[1])+strlen(string)+2);
761 if(var) {
762 sprintf(var, "%s=%s", child->argv[1], string);
763 res = set_local_var(var, 0);
764 } else
765 res = -1;
766 if (res)
767 fprintf(stderr, "read: %m\n");
768 free(var); /* So not move up to avoid breaking errno */
769 return res;
770 } else {
771 do res=getchar(); while(res!='\n' && res!=EOF);
772 return 0;
773 }
774 }
775
776 /* built-in 'set VAR=value' handler */
builtin_set(struct child_prog * child)777 static int builtin_set(struct child_prog *child)
778 {
779 char *temp = child->argv[1];
780 struct variables *e;
781
782 if (temp == NULL)
783 for(e = top_vars; e; e=e->next)
784 printf("%s=%s\n", e->name, e->value);
785 else
786 set_local_var(temp, 0);
787
788 return EXIT_SUCCESS;
789 }
790
791
792 /* Built-in 'shift' handler */
builtin_shift(struct child_prog * child)793 static int builtin_shift(struct child_prog *child)
794 {
795 int n=1;
796 if (child->argv[1]) {
797 n=atoi(child->argv[1]);
798 }
799 if (n>=0 && n<global_argc) {
800 /* XXX This probably breaks $0 */
801 global_argc -= n;
802 global_argv += n;
803 return EXIT_SUCCESS;
804 } else {
805 return EXIT_FAILURE;
806 }
807 }
808
809 /* Built-in '.' handler (read-in and execute commands from file) */
builtin_source(struct child_prog * child)810 static int builtin_source(struct child_prog *child)
811 {
812 FILE *input;
813 int status;
814
815 if (child->argv[1] == NULL)
816 return EXIT_FAILURE;
817
818 /* XXX search through $PATH is missing */
819 input = fopen(child->argv[1], "r");
820 if (!input) {
821 error_msg("Couldn't open file '%s'", child->argv[1]);
822 return EXIT_FAILURE;
823 }
824
825 /* Now run the file */
826 /* XXX argv and argc are broken; need to save old global_argv
827 * (pointer only is OK!) on this stack frame,
828 * set global_argv=child->argv+1, recurse, and restore. */
829 mark_open(fileno(input));
830 status = parse_file_outer(input);
831 mark_closed(fileno(input));
832 fclose(input);
833 return (status);
834 }
835
builtin_umask(struct child_prog * child)836 static int builtin_umask(struct child_prog *child)
837 {
838 mode_t new_umask;
839 const char *arg = child->argv[1];
840 char *end;
841 if (arg) {
842 new_umask=strtoul(arg, &end, 8);
843 if (*end!='\0' || end == arg) {
844 return EXIT_FAILURE;
845 }
846 } else {
847 printf("%.3o\n", (unsigned int) (new_umask=umask(0)));
848 }
849 umask(new_umask);
850 return EXIT_SUCCESS;
851 }
852
853 /* built-in 'unset VAR' handler */
builtin_unset(struct child_prog * child)854 static int builtin_unset(struct child_prog *child)
855 {
856 /* bash returned already true */
857 unset_local_var(child->argv[1]);
858 return EXIT_SUCCESS;
859 }
860
builtin_not_written(struct child_prog * child)861 static int builtin_not_written(struct child_prog *child)
862 {
863 printf("builtin_%s not written\n",child->argv[0]);
864 return EXIT_FAILURE;
865 }
866 #endif
867
b_check_space(o_string * o,int len)868 static int b_check_space(o_string *o, int len)
869 {
870 /* It would be easy to drop a more restrictive policy
871 * in here, such as setting a maximum string length */
872 if (o->length + len > o->maxlen) {
873 char *old_data = o->data;
874 /* assert (data == NULL || o->maxlen != 0); */
875 o->maxlen += max(2*len, B_CHUNK);
876 o->data = realloc(o->data, 1 + o->maxlen);
877 if (o->data == NULL) {
878 free(old_data);
879 }
880 }
881 return o->data == NULL;
882 }
883
b_addchr(o_string * o,int ch)884 static int b_addchr(o_string *o, int ch)
885 {
886 debug_printf("b_addchr: %c %d %p\n", ch, o->length, o);
887 if (b_check_space(o, 1)) return B_NOSPAC;
888 o->data[o->length] = ch;
889 o->length++;
890 o->data[o->length] = '\0';
891 return 0;
892 }
893
b_reset(o_string * o)894 static void b_reset(o_string *o)
895 {
896 o->length = 0;
897 o->nonnull = 0;
898 if (o->data != NULL) *o->data = '\0';
899 }
900
b_free(o_string * o)901 static void b_free(o_string *o)
902 {
903 b_reset(o);
904 free(o->data);
905 o->data = NULL;
906 o->maxlen = 0;
907 }
908
909 /* My analysis of quoting semantics tells me that state information
910 * is associated with a destination, not a source.
911 */
b_addqchr(o_string * o,int ch,int quote)912 static int b_addqchr(o_string *o, int ch, int quote)
913 {
914 if (quote && strchr("*?[\\",ch)) {
915 int rc;
916 rc = b_addchr(o, '\\');
917 if (rc) return rc;
918 }
919 return b_addchr(o, ch);
920 }
921
922 #ifndef __U_BOOT__
b_adduint(o_string * o,unsigned int i)923 static int b_adduint(o_string *o, unsigned int i)
924 {
925 int r;
926 char *p = simple_itoa(i);
927 /* no escape checking necessary */
928 do r=b_addchr(o, *p++); while (r==0 && *p);
929 return r;
930 }
931 #endif
932
static_get(struct in_str * i)933 static int static_get(struct in_str *i)
934 {
935 int ch = *i->p++;
936 if (ch=='\0') return EOF;
937 return ch;
938 }
939
static_peek(struct in_str * i)940 static int static_peek(struct in_str *i)
941 {
942 return *i->p;
943 }
944
945 #ifndef __U_BOOT__
cmdedit_set_initial_prompt(void)946 static inline void cmdedit_set_initial_prompt(void)
947 {
948 #ifndef CONFIG_FEATURE_SH_FANCY_PROMPT
949 PS1 = NULL;
950 #else
951 PS1 = env_get("PS1");
952 if(PS1==0)
953 PS1 = "\\w \\$ ";
954 #endif
955 }
956
setup_prompt_string(int promptmode,char ** prompt_str)957 static inline void setup_prompt_string(int promptmode, char **prompt_str)
958 {
959 debug_printf("setup_prompt_string %d ",promptmode);
960 #ifndef CONFIG_FEATURE_SH_FANCY_PROMPT
961 /* Set up the prompt */
962 if (promptmode == 1) {
963 free(PS1);
964 PS1=xmalloc(strlen(cwd)+4);
965 sprintf(PS1, "%s %s", cwd, ( geteuid() != 0 ) ? "$ ":"# ");
966 *prompt_str = PS1;
967 } else {
968 *prompt_str = PS2;
969 }
970 #else
971 *prompt_str = (promptmode==1)? PS1 : PS2;
972 #endif
973 debug_printf("result %s\n",*prompt_str);
974 }
975 #endif
976
977 #ifdef __U_BOOT__
uboot_cli_readline(struct in_str * i)978 static int uboot_cli_readline(struct in_str *i)
979 {
980 char *prompt;
981 char __maybe_unused *ps_prompt = NULL;
982
983 if (i->promptmode == 1)
984 prompt = CONFIG_SYS_PROMPT;
985 else
986 prompt = CONFIG_SYS_PROMPT_HUSH_PS2;
987
988 #ifdef CONFIG_CMDLINE_PS_SUPPORT
989 if (i->promptmode == 1)
990 ps_prompt = env_get("PS1");
991 else
992 ps_prompt = env_get("PS2");
993 if (ps_prompt)
994 prompt = ps_prompt;
995 #endif
996
997 return cli_readline(prompt);
998 }
999 #endif
1000
get_user_input(struct in_str * i)1001 static void get_user_input(struct in_str *i)
1002 {
1003 #ifndef __U_BOOT__
1004 char *prompt_str;
1005 static char the_command[BUFSIZ];
1006
1007 setup_prompt_string(i->promptmode, &prompt_str);
1008 #ifdef CONFIG_FEATURE_COMMAND_EDITING
1009 /*
1010 ** enable command line editing only while a command line
1011 ** is actually being read; otherwise, we'll end up bequeathing
1012 ** atexit() handlers and other unwanted stuff to our
1013 ** child processes (rob@sysgo.de)
1014 */
1015 cmdedit_read_input(prompt_str, the_command);
1016 #else
1017 fputs(prompt_str, stdout);
1018 fflush(stdout);
1019 the_command[0]=fgetc(i->file);
1020 the_command[1]='\0';
1021 #endif
1022 fflush(stdout);
1023 i->p = the_command;
1024 #else
1025 int n;
1026 static char the_command[CONFIG_SYS_CBSIZE + 1];
1027
1028 bootretry_reset_cmd_timeout();
1029 i->__promptme = 1;
1030 n = uboot_cli_readline(i);
1031
1032 #ifdef CONFIG_BOOT_RETRY_TIME
1033 if (n == -2) {
1034 puts("\nTimeout waiting for command\n");
1035 # ifdef CONFIG_RESET_TO_RETRY
1036 do_reset(NULL, 0, 0, NULL);
1037 # else
1038 # error "This currently only works with CONFIG_RESET_TO_RETRY enabled"
1039 # endif
1040 }
1041 #endif
1042 if (n == -1 ) {
1043 flag_repeat = 0;
1044 i->__promptme = 0;
1045 } else if (n == -3) {
1046 flag_repeat = 0;
1047 }
1048 n = strlen(console_buffer);
1049 console_buffer[n] = '\n';
1050 console_buffer[n+1]= '\0';
1051 if (had_ctrlc()) flag_repeat = 0;
1052 clear_ctrlc();
1053 do_repeat = 0;
1054 if (i->promptmode == 1) {
1055 if (console_buffer[0] == '\n'&& flag_repeat == 0) {
1056 strcpy(the_command,console_buffer);
1057 }
1058 else {
1059 if (console_buffer[0] != '\n') {
1060 strcpy(the_command,console_buffer);
1061 flag_repeat = 1;
1062 }
1063 else {
1064 do_repeat = 1;
1065 }
1066 }
1067 i->p = the_command;
1068 }
1069 else {
1070 if (console_buffer[0] != '\n') {
1071 if (strlen(the_command) + strlen(console_buffer)
1072 < CONFIG_SYS_CBSIZE) {
1073 n = strlen(the_command);
1074 the_command[n-1] = ' ';
1075 strcpy(&the_command[n],console_buffer);
1076 }
1077 else {
1078 the_command[0] = '\n';
1079 the_command[1] = '\0';
1080 flag_repeat = 0;
1081 }
1082 }
1083 if (i->__promptme == 0) {
1084 the_command[0] = '\n';
1085 the_command[1] = '\0';
1086 }
1087 i->p = console_buffer;
1088 }
1089 #endif
1090 }
1091
1092 /* This is the magic location that prints prompts
1093 * and gets data back from the user */
file_get(struct in_str * i)1094 static int file_get(struct in_str *i)
1095 {
1096 int ch;
1097
1098 ch = 0;
1099 /* If there is data waiting, eat it up */
1100 if (i->p && *i->p) {
1101 ch = *i->p++;
1102 } else {
1103 /* need to double check i->file because we might be doing something
1104 * more complicated by now, like sourcing or substituting. */
1105 #ifndef __U_BOOT__
1106 if (i->__promptme && interactive && i->file == stdin) {
1107 while(! i->p || (interactive && strlen(i->p)==0) ) {
1108 #else
1109 while(! i->p || strlen(i->p)==0 ) {
1110 #endif
1111 get_user_input(i);
1112 }
1113 i->promptmode=2;
1114 #ifndef __U_BOOT__
1115 i->__promptme = 0;
1116 #endif
1117 if (i->p && *i->p) {
1118 ch = *i->p++;
1119 }
1120 #ifndef __U_BOOT__
1121 } else {
1122 ch = fgetc(i->file);
1123 }
1124
1125 #endif
1126 debug_printf("b_getch: got a %d\n", ch);
1127 }
1128 #ifndef __U_BOOT__
1129 if (ch == '\n') i->__promptme=1;
1130 #endif
1131 return ch;
1132 }
1133
1134 /* All the callers guarantee this routine will never be
1135 * used right after a newline, so prompting is not needed.
1136 */
1137 static int file_peek(struct in_str *i)
1138 {
1139 #ifndef __U_BOOT__
1140 if (i->p && *i->p) {
1141 #endif
1142 return *i->p;
1143 #ifndef __U_BOOT__
1144 } else {
1145 i->peek_buf[0] = fgetc(i->file);
1146 i->peek_buf[1] = '\0';
1147 i->p = i->peek_buf;
1148 debug_printf("b_peek: got a %d\n", *i->p);
1149 return *i->p;
1150 }
1151 #endif
1152 }
1153
1154 #ifndef __U_BOOT__
1155 static void setup_file_in_str(struct in_str *i, FILE *f)
1156 #else
1157 static void setup_file_in_str(struct in_str *i)
1158 #endif
1159 {
1160 i->peek = file_peek;
1161 i->get = file_get;
1162 i->__promptme=1;
1163 i->promptmode=1;
1164 #ifndef __U_BOOT__
1165 i->file = f;
1166 #endif
1167 i->p = NULL;
1168 }
1169
1170 static void setup_string_in_str(struct in_str *i, const char *s)
1171 {
1172 i->peek = static_peek;
1173 i->get = static_get;
1174 i->__promptme=1;
1175 i->promptmode=1;
1176 i->p = s;
1177 }
1178
1179 #ifndef __U_BOOT__
1180 static void mark_open(int fd)
1181 {
1182 struct close_me *new = xmalloc(sizeof(struct close_me));
1183 new->fd = fd;
1184 new->next = close_me_head;
1185 close_me_head = new;
1186 }
1187
1188 static void mark_closed(int fd)
1189 {
1190 struct close_me *tmp;
1191 if (close_me_head == NULL || close_me_head->fd != fd)
1192 error_msg_and_die("corrupt close_me");
1193 tmp = close_me_head;
1194 close_me_head = close_me_head->next;
1195 free(tmp);
1196 }
1197
1198 static void close_all(void)
1199 {
1200 struct close_me *c;
1201 for (c=close_me_head; c; c=c->next) {
1202 close(c->fd);
1203 }
1204 close_me_head = NULL;
1205 }
1206
1207 /* squirrel != NULL means we squirrel away copies of stdin, stdout,
1208 * and stderr if they are redirected. */
1209 static int setup_redirects(struct child_prog *prog, int squirrel[])
1210 {
1211 int openfd, mode;
1212 struct redir_struct *redir;
1213
1214 for (redir=prog->redirects; redir; redir=redir->next) {
1215 if (redir->dup == -1 && redir->word.gl_pathv == NULL) {
1216 /* something went wrong in the parse. Pretend it didn't happen */
1217 continue;
1218 }
1219 if (redir->dup == -1) {
1220 mode=redir_table[redir->type].mode;
1221 openfd = open(redir->word.gl_pathv[0], mode, 0666);
1222 if (openfd < 0) {
1223 /* this could get lost if stderr has been redirected, but
1224 bash and ash both lose it as well (though zsh doesn't!) */
1225 perror_msg("error opening %s", redir->word.gl_pathv[0]);
1226 return 1;
1227 }
1228 } else {
1229 openfd = redir->dup;
1230 }
1231
1232 if (openfd != redir->fd) {
1233 if (squirrel && redir->fd < 3) {
1234 squirrel[redir->fd] = dup(redir->fd);
1235 }
1236 if (openfd == -3) {
1237 close(openfd);
1238 } else {
1239 dup2(openfd, redir->fd);
1240 if (redir->dup == -1)
1241 close (openfd);
1242 }
1243 }
1244 }
1245 return 0;
1246 }
1247
1248 static void restore_redirects(int squirrel[])
1249 {
1250 int i, fd;
1251 for (i=0; i<3; i++) {
1252 fd = squirrel[i];
1253 if (fd != -1) {
1254 /* No error checking. I sure wouldn't know what
1255 * to do with an error if I found one! */
1256 dup2(fd, i);
1257 close(fd);
1258 }
1259 }
1260 }
1261
1262 /* never returns */
1263 /* XXX no exit() here. If you don't exec, use _exit instead.
1264 * The at_exit handlers apparently confuse the calling process,
1265 * in particular stdin handling. Not sure why? */
1266 static void pseudo_exec(struct child_prog *child)
1267 {
1268 int i, rcode;
1269 char *p;
1270 struct built_in_command *x;
1271 if (child->argv) {
1272 for (i=0; is_assignment(child->argv[i]); i++) {
1273 debug_printf("pid %d environment modification: %s\n",getpid(),child->argv[i]);
1274 p = insert_var_value(child->argv[i]);
1275 putenv(strdup(p));
1276 if (p != child->argv[i]) free(p);
1277 }
1278 child->argv+=i; /* XXX this hack isn't so horrible, since we are about
1279 to exit, and therefore don't need to keep data
1280 structures consistent for free() use. */
1281 /* If a variable is assigned in a forest, and nobody listens,
1282 * was it ever really set?
1283 */
1284 if (child->argv[0] == NULL) {
1285 _exit(EXIT_SUCCESS);
1286 }
1287
1288 /*
1289 * Check if the command matches any of the builtins.
1290 * Depending on context, this might be redundant. But it's
1291 * easier to waste a few CPU cycles than it is to figure out
1292 * if this is one of those cases.
1293 */
1294 for (x = bltins; x->cmd; x++) {
1295 if (strcmp(child->argv[0], x->cmd) == 0 ) {
1296 debug_printf("builtin exec %s\n", child->argv[0]);
1297 rcode = x->function(child);
1298 fflush(stdout);
1299 _exit(rcode);
1300 }
1301 }
1302
1303 /* Check if the command matches any busybox internal commands
1304 * ("applets") here.
1305 * FIXME: This feature is not 100% safe, since
1306 * BusyBox is not fully reentrant, so we have no guarantee the things
1307 * from the .bss are still zeroed, or that things from .data are still
1308 * at their defaults. We could exec ourself from /proc/self/exe, but I
1309 * really dislike relying on /proc for things. We could exec ourself
1310 * from global_argv[0], but if we are in a chroot, we may not be able
1311 * to find ourself... */
1312 #ifdef CONFIG_FEATURE_SH_STANDALONE_SHELL
1313 {
1314 int argc_l;
1315 char** argv_l=child->argv;
1316 char *name = child->argv[0];
1317
1318 #ifdef CONFIG_FEATURE_SH_APPLETS_ALWAYS_WIN
1319 /* Following discussions from November 2000 on the busybox mailing
1320 * list, the default configuration, (without
1321 * get_last_path_component()) lets the user force use of an
1322 * external command by specifying the full (with slashes) filename.
1323 * If you enable CONFIG_FEATURE_SH_APPLETS_ALWAYS_WIN then applets
1324 * _aways_ override external commands, so if you want to run
1325 * /bin/cat, it will use BusyBox cat even if /bin/cat exists on the
1326 * filesystem and is _not_ busybox. Some systems may want this,
1327 * most do not. */
1328 name = get_last_path_component(name);
1329 #endif
1330 /* Count argc for use in a second... */
1331 for(argc_l=0;*argv_l!=NULL; argv_l++, argc_l++);
1332 optind = 1;
1333 debug_printf("running applet %s\n", name);
1334 run_applet_by_name(name, argc_l, child->argv);
1335 }
1336 #endif
1337 debug_printf("exec of %s\n",child->argv[0]);
1338 execvp(child->argv[0],child->argv);
1339 perror_msg("couldn't exec: %s",child->argv[0]);
1340 _exit(1);
1341 } else if (child->group) {
1342 debug_printf("runtime nesting to group\n");
1343 interactive=0; /* crucial!!!! */
1344 rcode = run_list_real(child->group);
1345 /* OK to leak memory by not calling free_pipe_list,
1346 * since this process is about to exit */
1347 _exit(rcode);
1348 } else {
1349 /* Can happen. See what bash does with ">foo" by itself. */
1350 debug_printf("trying to pseudo_exec null command\n");
1351 _exit(EXIT_SUCCESS);
1352 }
1353 }
1354
1355 static void insert_bg_job(struct pipe *pi)
1356 {
1357 struct pipe *thejob;
1358
1359 /* Linear search for the ID of the job to use */
1360 pi->jobid = 1;
1361 for (thejob = job_list; thejob; thejob = thejob->next)
1362 if (thejob->jobid >= pi->jobid)
1363 pi->jobid = thejob->jobid + 1;
1364
1365 /* add thejob to the list of running jobs */
1366 if (!job_list) {
1367 thejob = job_list = xmalloc(sizeof(*thejob));
1368 } else {
1369 for (thejob = job_list; thejob->next; thejob = thejob->next) /* nothing */;
1370 thejob->next = xmalloc(sizeof(*thejob));
1371 thejob = thejob->next;
1372 }
1373
1374 /* physically copy the struct job */
1375 memcpy(thejob, pi, sizeof(struct pipe));
1376 thejob->next = NULL;
1377 thejob->running_progs = thejob->num_progs;
1378 thejob->stopped_progs = 0;
1379 thejob->text = xmalloc(BUFSIZ); /* cmdedit buffer size */
1380
1381 /*if (pi->progs[0] && pi->progs[0].argv && pi->progs[0].argv[0]) */
1382 {
1383 char *bar=thejob->text;
1384 char **foo=pi->progs[0].argv;
1385 while(foo && *foo) {
1386 bar += sprintf(bar, "%s ", *foo++);
1387 }
1388 }
1389
1390 /* we don't wait for background thejobs to return -- append it
1391 to the list of backgrounded thejobs and leave it alone */
1392 printf("[%d] %d\n", thejob->jobid, thejob->progs[0].pid);
1393 last_bg_pid = thejob->progs[0].pid;
1394 last_jobid = thejob->jobid;
1395 }
1396
1397 /* remove a backgrounded job */
1398 static void remove_bg_job(struct pipe *pi)
1399 {
1400 struct pipe *prev_pipe;
1401
1402 if (pi == job_list) {
1403 job_list = pi->next;
1404 } else {
1405 prev_pipe = job_list;
1406 while (prev_pipe->next != pi)
1407 prev_pipe = prev_pipe->next;
1408 prev_pipe->next = pi->next;
1409 }
1410 if (job_list)
1411 last_jobid = job_list->jobid;
1412 else
1413 last_jobid = 0;
1414
1415 pi->stopped_progs = 0;
1416 free_pipe(pi, 0);
1417 free(pi);
1418 }
1419
1420 /* Checks to see if any processes have exited -- if they
1421 have, figure out why and see if a job has completed */
1422 static int checkjobs(struct pipe* fg_pipe)
1423 {
1424 int attributes;
1425 int status;
1426 int prognum = 0;
1427 struct pipe *pi;
1428 pid_t childpid;
1429
1430 attributes = WUNTRACED;
1431 if (fg_pipe==NULL) {
1432 attributes |= WNOHANG;
1433 }
1434
1435 while ((childpid = waitpid(-1, &status, attributes)) > 0) {
1436 if (fg_pipe) {
1437 int i, rcode = 0;
1438 for (i=0; i < fg_pipe->num_progs; i++) {
1439 if (fg_pipe->progs[i].pid == childpid) {
1440 if (i==fg_pipe->num_progs-1)
1441 rcode=WEXITSTATUS(status);
1442 (fg_pipe->num_progs)--;
1443 return(rcode);
1444 }
1445 }
1446 }
1447
1448 for (pi = job_list; pi; pi = pi->next) {
1449 prognum = 0;
1450 while (prognum < pi->num_progs && pi->progs[prognum].pid != childpid) {
1451 prognum++;
1452 }
1453 if (prognum < pi->num_progs)
1454 break;
1455 }
1456
1457 if(pi==NULL) {
1458 debug_printf("checkjobs: pid %d was not in our list!\n", childpid);
1459 continue;
1460 }
1461
1462 if (WIFEXITED(status) || WIFSIGNALED(status)) {
1463 /* child exited */
1464 pi->running_progs--;
1465 pi->progs[prognum].pid = 0;
1466
1467 if (!pi->running_progs) {
1468 printf(JOB_STATUS_FORMAT, pi->jobid, "Done", pi->text);
1469 remove_bg_job(pi);
1470 }
1471 } else {
1472 /* child stopped */
1473 pi->stopped_progs++;
1474 pi->progs[prognum].is_stopped = 1;
1475
1476 #if 0
1477 /* Printing this stuff is a pain, since it tends to
1478 * overwrite the prompt an inconveinient moments. So
1479 * don't do that. */
1480 if (pi->stopped_progs == pi->num_progs) {
1481 printf("\n"JOB_STATUS_FORMAT, pi->jobid, "Stopped", pi->text);
1482 }
1483 #endif
1484 }
1485 }
1486
1487 if (childpid == -1 && errno != ECHILD)
1488 perror_msg("waitpid");
1489
1490 /* move the shell to the foreground */
1491 /*if (interactive && tcsetpgrp(shell_terminal, getpgid(0))) */
1492 /* perror_msg("tcsetpgrp-2"); */
1493 return -1;
1494 }
1495
1496 /* Figure out our controlling tty, checking in order stderr,
1497 * stdin, and stdout. If check_pgrp is set, also check that
1498 * we belong to the foreground process group associated with
1499 * that tty. The value of shell_terminal is needed in order to call
1500 * tcsetpgrp(shell_terminal, ...); */
1501 void controlling_tty(int check_pgrp)
1502 {
1503 pid_t curpgrp;
1504
1505 if ((curpgrp = tcgetpgrp(shell_terminal = 2)) < 0
1506 && (curpgrp = tcgetpgrp(shell_terminal = 0)) < 0
1507 && (curpgrp = tcgetpgrp(shell_terminal = 1)) < 0)
1508 goto shell_terminal_error;
1509
1510 if (check_pgrp && curpgrp != getpgid(0))
1511 goto shell_terminal_error;
1512
1513 return;
1514
1515 shell_terminal_error:
1516 shell_terminal = -1;
1517 return;
1518 }
1519 #endif
1520
1521 /* run_pipe_real() starts all the jobs, but doesn't wait for anything
1522 * to finish. See checkjobs().
1523 *
1524 * return code is normally -1, when the caller has to wait for children
1525 * to finish to determine the exit status of the pipe. If the pipe
1526 * is a simple builtin command, however, the action is done by the
1527 * time run_pipe_real returns, and the exit code is provided as the
1528 * return value.
1529 *
1530 * The input of the pipe is always stdin, the output is always
1531 * stdout. The outpipe[] mechanism in BusyBox-0.48 lash is bogus,
1532 * because it tries to avoid running the command substitution in
1533 * subshell, when that is in fact necessary. The subshell process
1534 * now has its stdout directed to the input of the appropriate pipe,
1535 * so this routine is noticeably simpler.
1536 */
1537 static int run_pipe_real(struct pipe *pi)
1538 {
1539 int i;
1540 #ifndef __U_BOOT__
1541 int nextin, nextout;
1542 int pipefds[2]; /* pipefds[0] is for reading */
1543 struct child_prog *child;
1544 struct built_in_command *x;
1545 char *p;
1546 # if __GNUC__
1547 /* Avoid longjmp clobbering */
1548 (void) &i;
1549 (void) &nextin;
1550 (void) &nextout;
1551 (void) &child;
1552 # endif
1553 #else
1554 int nextin;
1555 int flag = do_repeat ? CMD_FLAG_REPEAT : 0;
1556 struct child_prog *child;
1557 char *p;
1558 # if __GNUC__
1559 /* Avoid longjmp clobbering */
1560 (void) &i;
1561 (void) &nextin;
1562 (void) &child;
1563 # endif
1564 #endif /* __U_BOOT__ */
1565
1566 nextin = 0;
1567 #ifndef __U_BOOT__
1568 pi->pgrp = -1;
1569 #endif
1570
1571 /* Check if this is a simple builtin (not part of a pipe).
1572 * Builtins within pipes have to fork anyway, and are handled in
1573 * pseudo_exec. "echo foo | read bar" doesn't work on bash, either.
1574 */
1575 if (pi->num_progs == 1) child = & (pi->progs[0]);
1576 #ifndef __U_BOOT__
1577 if (pi->num_progs == 1 && child->group && child->subshell == 0) {
1578 int squirrel[] = {-1, -1, -1};
1579 int rcode;
1580 debug_printf("non-subshell grouping\n");
1581 setup_redirects(child, squirrel);
1582 /* XXX could we merge code with following builtin case,
1583 * by creating a pseudo builtin that calls run_list_real? */
1584 rcode = run_list_real(child->group);
1585 restore_redirects(squirrel);
1586 #else
1587 if (pi->num_progs == 1 && child->group) {
1588 int rcode;
1589 debug_printf("non-subshell grouping\n");
1590 rcode = run_list_real(child->group);
1591 #endif
1592 return rcode;
1593 } else if (pi->num_progs == 1 && pi->progs[0].argv != NULL) {
1594 for (i=0; is_assignment(child->argv[i]); i++) { /* nothing */ }
1595 if (i!=0 && child->argv[i]==NULL) {
1596 /* assignments, but no command: set the local environment */
1597 for (i=0; child->argv[i]!=NULL; i++) {
1598
1599 /* Ok, this case is tricky. We have to decide if this is a
1600 * local variable, or an already exported variable. If it is
1601 * already exported, we have to export the new value. If it is
1602 * not exported, we need only set this as a local variable.
1603 * This junk is all to decide whether or not to export this
1604 * variable. */
1605 int export_me=0;
1606 char *name, *value;
1607 name = xstrdup(child->argv[i]);
1608 debug_printf("Local environment set: %s\n", name);
1609 value = strchr(name, '=');
1610 if (value)
1611 *value=0;
1612 #ifndef __U_BOOT__
1613 if ( get_local_var(name)) {
1614 export_me=1;
1615 }
1616 #endif
1617 free(name);
1618 p = insert_var_value(child->argv[i]);
1619 set_local_var(p, export_me);
1620 if (p != child->argv[i]) free(p);
1621 }
1622 return EXIT_SUCCESS; /* don't worry about errors in set_local_var() yet */
1623 }
1624 for (i = 0; is_assignment(child->argv[i]); i++) {
1625 p = insert_var_value(child->argv[i]);
1626 #ifndef __U_BOOT__
1627 putenv(strdup(p));
1628 #else
1629 set_local_var(p, 0);
1630 #endif
1631 if (p != child->argv[i]) {
1632 child->sp--;
1633 free(p);
1634 }
1635 }
1636 if (child->sp) {
1637 char * str = NULL;
1638
1639 str = make_string(child->argv + i,
1640 child->argv_nonnull + i);
1641 parse_string_outer(str, FLAG_EXIT_FROM_LOOP | FLAG_REPARSING);
1642 free(str);
1643 return last_return_code;
1644 }
1645 #ifndef __U_BOOT__
1646 for (x = bltins; x->cmd; x++) {
1647 if (strcmp(child->argv[i], x->cmd) == 0 ) {
1648 int squirrel[] = {-1, -1, -1};
1649 int rcode;
1650 if (x->function == builtin_exec && child->argv[i+1]==NULL) {
1651 debug_printf("magic exec\n");
1652 setup_redirects(child,NULL);
1653 return EXIT_SUCCESS;
1654 }
1655 debug_printf("builtin inline %s\n", child->argv[0]);
1656 /* XXX setup_redirects acts on file descriptors, not FILEs.
1657 * This is perfect for work that comes after exec().
1658 * Is it really safe for inline use? Experimentally,
1659 * things seem to work with glibc. */
1660 setup_redirects(child, squirrel);
1661
1662 child->argv += i; /* XXX horrible hack */
1663 rcode = x->function(child);
1664 /* XXX restore hack so free() can work right */
1665 child->argv -= i;
1666 restore_redirects(squirrel);
1667 }
1668 return rcode;
1669 }
1670 #else
1671 /* check ";", because ,example , argv consist from
1672 * "help;flinfo" must not execute
1673 */
1674 if (strchr(child->argv[i], ';')) {
1675 printf("Unknown command '%s' - try 'help' or use "
1676 "'run' command\n", child->argv[i]);
1677 return -1;
1678 }
1679 /* Process the command */
1680 return cmd_process(flag, child->argc, child->argv,
1681 &flag_repeat, NULL);
1682 #endif
1683 }
1684 #ifndef __U_BOOT__
1685
1686 for (i = 0; i < pi->num_progs; i++) {
1687 child = & (pi->progs[i]);
1688
1689 /* pipes are inserted between pairs of commands */
1690 if ((i + 1) < pi->num_progs) {
1691 if (pipe(pipefds)<0) perror_msg_and_die("pipe");
1692 nextout = pipefds[1];
1693 } else {
1694 nextout=1;
1695 pipefds[0] = -1;
1696 }
1697
1698 /* XXX test for failed fork()? */
1699 if (!(child->pid = fork())) {
1700 /* Set the handling for job control signals back to the default. */
1701 signal(SIGINT, SIG_DFL);
1702 signal(SIGQUIT, SIG_DFL);
1703 signal(SIGTERM, SIG_DFL);
1704 signal(SIGTSTP, SIG_DFL);
1705 signal(SIGTTIN, SIG_DFL);
1706 signal(SIGTTOU, SIG_DFL);
1707 signal(SIGCHLD, SIG_DFL);
1708
1709 close_all();
1710
1711 if (nextin != 0) {
1712 dup2(nextin, 0);
1713 close(nextin);
1714 }
1715 if (nextout != 1) {
1716 dup2(nextout, 1);
1717 close(nextout);
1718 }
1719 if (pipefds[0]!=-1) {
1720 close(pipefds[0]); /* opposite end of our output pipe */
1721 }
1722
1723 /* Like bash, explicit redirects override pipes,
1724 * and the pipe fd is available for dup'ing. */
1725 setup_redirects(child,NULL);
1726
1727 if (interactive && pi->followup!=PIPE_BG) {
1728 /* If we (the child) win the race, put ourselves in the process
1729 * group whose leader is the first process in this pipe. */
1730 if (pi->pgrp < 0) {
1731 pi->pgrp = getpid();
1732 }
1733 if (setpgid(0, pi->pgrp) == 0) {
1734 tcsetpgrp(2, pi->pgrp);
1735 }
1736 }
1737
1738 pseudo_exec(child);
1739 }
1740
1741
1742 /* put our child in the process group whose leader is the
1743 first process in this pipe */
1744 if (pi->pgrp < 0) {
1745 pi->pgrp = child->pid;
1746 }
1747 /* Don't check for errors. The child may be dead already,
1748 * in which case setpgid returns error code EACCES. */
1749 setpgid(child->pid, pi->pgrp);
1750
1751 if (nextin != 0)
1752 close(nextin);
1753 if (nextout != 1)
1754 close(nextout);
1755
1756 /* If there isn't another process, nextin is garbage
1757 but it doesn't matter */
1758 nextin = pipefds[0];
1759 }
1760 #endif
1761 return -1;
1762 }
1763
1764 static int run_list_real(struct pipe *pi)
1765 {
1766 char *save_name = NULL;
1767 char **list = NULL;
1768 char **save_list = NULL;
1769 struct pipe *rpipe;
1770 int flag_rep = 0;
1771 #ifndef __U_BOOT__
1772 int save_num_progs;
1773 #endif
1774 int rcode=0, flag_skip=1;
1775 int flag_restore = 0;
1776 int if_code=0, next_if_code=0; /* need double-buffer to handle elif */
1777 reserved_style rmode, skip_more_in_this_rmode=RES_XXXX;
1778 /* check syntax for "for" */
1779 for (rpipe = pi; rpipe; rpipe = rpipe->next) {
1780 if ((rpipe->r_mode == RES_IN ||
1781 rpipe->r_mode == RES_FOR) &&
1782 (rpipe->next == NULL)) {
1783 syntax();
1784 #ifdef __U_BOOT__
1785 flag_repeat = 0;
1786 #endif
1787 return 1;
1788 }
1789 if ((rpipe->r_mode == RES_IN &&
1790 (rpipe->next->r_mode == RES_IN &&
1791 rpipe->next->progs->argv != NULL))||
1792 (rpipe->r_mode == RES_FOR &&
1793 rpipe->next->r_mode != RES_IN)) {
1794 syntax();
1795 #ifdef __U_BOOT__
1796 flag_repeat = 0;
1797 #endif
1798 return 1;
1799 }
1800 }
1801 for (; pi; pi = (flag_restore != 0) ? rpipe : pi->next) {
1802 if (pi->r_mode == RES_WHILE || pi->r_mode == RES_UNTIL ||
1803 pi->r_mode == RES_FOR) {
1804 #ifdef __U_BOOT__
1805 /* check Ctrl-C */
1806 ctrlc();
1807 if ((had_ctrlc())) {
1808 return 1;
1809 }
1810 #endif
1811 flag_restore = 0;
1812 if (!rpipe) {
1813 flag_rep = 0;
1814 rpipe = pi;
1815 }
1816 }
1817 rmode = pi->r_mode;
1818 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);
1819 if (rmode == skip_more_in_this_rmode && flag_skip) {
1820 if (pi->followup == PIPE_SEQ) flag_skip=0;
1821 continue;
1822 }
1823 flag_skip = 1;
1824 skip_more_in_this_rmode = RES_XXXX;
1825 if (rmode == RES_THEN || rmode == RES_ELSE) if_code = next_if_code;
1826 if (rmode == RES_THEN && if_code) continue;
1827 if (rmode == RES_ELSE && !if_code) continue;
1828 if (rmode == RES_ELIF && !if_code) break;
1829 if (rmode == RES_FOR && pi->num_progs) {
1830 if (!list) {
1831 /* if no variable values after "in" we skip "for" */
1832 if (!pi->next->progs->argv) continue;
1833 /* create list of variable values */
1834 list = make_list_in(pi->next->progs->argv,
1835 pi->progs->argv[0]);
1836 save_list = list;
1837 save_name = pi->progs->argv[0];
1838 pi->progs->argv[0] = NULL;
1839 flag_rep = 1;
1840 }
1841 if (!(*list)) {
1842 free(pi->progs->argv[0]);
1843 free(save_list);
1844 list = NULL;
1845 flag_rep = 0;
1846 pi->progs->argv[0] = save_name;
1847 #ifndef __U_BOOT__
1848 pi->progs->glob_result.gl_pathv[0] =
1849 pi->progs->argv[0];
1850 #endif
1851 continue;
1852 } else {
1853 /* insert new value from list for variable */
1854 if (pi->progs->argv[0])
1855 free(pi->progs->argv[0]);
1856 pi->progs->argv[0] = *list++;
1857 #ifndef __U_BOOT__
1858 pi->progs->glob_result.gl_pathv[0] =
1859 pi->progs->argv[0];
1860 #endif
1861 }
1862 }
1863 if (rmode == RES_IN) continue;
1864 if (rmode == RES_DO) {
1865 if (!flag_rep) continue;
1866 }
1867 if (rmode == RES_DONE) {
1868 if (flag_rep) {
1869 flag_restore = 1;
1870 } else {
1871 rpipe = NULL;
1872 }
1873 }
1874 if (pi->num_progs == 0) continue;
1875 #ifndef __U_BOOT__
1876 save_num_progs = pi->num_progs; /* save number of programs */
1877 #endif
1878 rcode = run_pipe_real(pi);
1879 debug_printf("run_pipe_real returned %d\n",rcode);
1880 #ifndef __U_BOOT__
1881 if (rcode!=-1) {
1882 /* We only ran a builtin: rcode was set by the return value
1883 * of run_pipe_real(), and we don't need to wait for anything. */
1884 } else if (pi->followup==PIPE_BG) {
1885 /* XXX check bash's behavior with nontrivial pipes */
1886 /* XXX compute jobid */
1887 /* XXX what does bash do with attempts to background builtins? */
1888 insert_bg_job(pi);
1889 rcode = EXIT_SUCCESS;
1890 } else {
1891 if (interactive) {
1892 /* move the new process group into the foreground */
1893 if (tcsetpgrp(shell_terminal, pi->pgrp) && errno != ENOTTY)
1894 perror_msg("tcsetpgrp-3");
1895 rcode = checkjobs(pi);
1896 /* move the shell to the foreground */
1897 if (tcsetpgrp(shell_terminal, getpgid(0)) && errno != ENOTTY)
1898 perror_msg("tcsetpgrp-4");
1899 } else {
1900 rcode = checkjobs(pi);
1901 }
1902 debug_printf("checkjobs returned %d\n",rcode);
1903 }
1904 last_return_code=rcode;
1905 #else
1906 if (rcode < -1) {
1907 last_return_code = -rcode - 2;
1908 return -2; /* exit */
1909 }
1910 last_return_code=(rcode == 0) ? 0 : 1;
1911 #endif
1912 #ifndef __U_BOOT__
1913 pi->num_progs = save_num_progs; /* restore number of programs */
1914 #endif
1915 if ( rmode == RES_IF || rmode == RES_ELIF )
1916 next_if_code=rcode; /* can be overwritten a number of times */
1917 if (rmode == RES_WHILE)
1918 flag_rep = !last_return_code;
1919 if (rmode == RES_UNTIL)
1920 flag_rep = last_return_code;
1921 if ( (rcode==EXIT_SUCCESS && pi->followup==PIPE_OR) ||
1922 (rcode!=EXIT_SUCCESS && pi->followup==PIPE_AND) )
1923 skip_more_in_this_rmode=rmode;
1924 #ifndef __U_BOOT__
1925 checkjobs(NULL);
1926 #endif
1927 }
1928 return rcode;
1929 }
1930
1931 /* broken, of course, but OK for testing */
1932 static char *indenter(int i)
1933 {
1934 static char blanks[]=" ";
1935 return &blanks[sizeof(blanks)-i-1];
1936 }
1937
1938 /* return code is the exit status of the pipe */
1939 static int free_pipe(struct pipe *pi, int indent)
1940 {
1941 char **p;
1942 struct child_prog *child;
1943 #ifndef __U_BOOT__
1944 struct redir_struct *r, *rnext;
1945 #endif
1946 int a, i, ret_code=0;
1947 char *ind = indenter(indent);
1948
1949 #ifndef __U_BOOT__
1950 if (pi->stopped_progs > 0)
1951 return ret_code;
1952 final_printf("%s run pipe: (pid %d)\n",ind,getpid());
1953 #endif
1954 for (i=0; i<pi->num_progs; i++) {
1955 child = &pi->progs[i];
1956 final_printf("%s command %d:\n",ind,i);
1957 if (child->argv) {
1958 for (a=0,p=child->argv; *p; a++,p++) {
1959 final_printf("%s argv[%d] = %s\n",ind,a,*p);
1960 }
1961 #ifndef __U_BOOT__
1962 globfree(&child->glob_result);
1963 #else
1964 for (a = 0; a < child->argc; a++) {
1965 free(child->argv[a]);
1966 }
1967 free(child->argv);
1968 free(child->argv_nonnull);
1969 child->argc = 0;
1970 #endif
1971 child->argv=NULL;
1972 } else if (child->group) {
1973 #ifndef __U_BOOT__
1974 final_printf("%s begin group (subshell:%d)\n",ind, child->subshell);
1975 #endif
1976 ret_code = free_pipe_list(child->group,indent+3);
1977 final_printf("%s end group\n",ind);
1978 } else {
1979 final_printf("%s (nil)\n",ind);
1980 }
1981 #ifndef __U_BOOT__
1982 for (r=child->redirects; r; r=rnext) {
1983 final_printf("%s redirect %d%s", ind, r->fd, redir_table[r->type].descrip);
1984 if (r->dup == -1) {
1985 /* guard against the case >$FOO, where foo is unset or blank */
1986 if (r->word.gl_pathv) {
1987 final_printf(" %s\n", *r->word.gl_pathv);
1988 globfree(&r->word);
1989 }
1990 } else {
1991 final_printf("&%d\n", r->dup);
1992 }
1993 rnext=r->next;
1994 free(r);
1995 }
1996 child->redirects=NULL;
1997 #endif
1998 }
1999 free(pi->progs); /* children are an array, they get freed all at once */
2000 pi->progs=NULL;
2001 return ret_code;
2002 }
2003
2004 static int free_pipe_list(struct pipe *head, int indent)
2005 {
2006 int rcode=0; /* if list has no members */
2007 struct pipe *pi, *next;
2008 char *ind = indenter(indent);
2009 for (pi=head; pi; pi=next) {
2010 final_printf("%s pipe reserved mode %d\n", ind, pi->r_mode);
2011 rcode = free_pipe(pi, indent);
2012 final_printf("%s pipe followup code %d\n", ind, pi->followup);
2013 next=pi->next;
2014 pi->next=NULL;
2015 free(pi);
2016 }
2017 return rcode;
2018 }
2019
2020 /* Select which version we will use */
2021 static int run_list(struct pipe *pi)
2022 {
2023 int rcode=0;
2024 #ifndef __U_BOOT__
2025 if (fake_mode==0) {
2026 #endif
2027 rcode = run_list_real(pi);
2028 #ifndef __U_BOOT__
2029 }
2030 #endif
2031 /* free_pipe_list has the side effect of clearing memory
2032 * In the long run that function can be merged with run_list_real,
2033 * but doing that now would hobble the debugging effort. */
2034 free_pipe_list(pi,0);
2035 return rcode;
2036 }
2037
2038 /* The API for glob is arguably broken. This routine pushes a non-matching
2039 * string into the output structure, removing non-backslashed backslashes.
2040 * If someone can prove me wrong, by performing this function within the
2041 * original glob(3) api, feel free to rewrite this routine into oblivion.
2042 * Return code (0 vs. GLOB_NOSPACE) matches glob(3).
2043 * XXX broken if the last character is '\\', check that before calling.
2044 */
2045 #ifndef __U_BOOT__
2046 static int globhack(const char *src, int flags, glob_t *pglob)
2047 {
2048 int cnt=0, pathc;
2049 const char *s;
2050 char *dest;
2051 for (cnt=1, s=src; s && *s; s++) {
2052 if (*s == '\\') s++;
2053 cnt++;
2054 }
2055 dest = malloc(cnt);
2056 if (!dest) return GLOB_NOSPACE;
2057 if (!(flags & GLOB_APPEND)) {
2058 pglob->gl_pathv=NULL;
2059 pglob->gl_pathc=0;
2060 pglob->gl_offs=0;
2061 pglob->gl_offs=0;
2062 }
2063 pathc = ++pglob->gl_pathc;
2064 pglob->gl_pathv = realloc(pglob->gl_pathv, (pathc+1)*sizeof(*pglob->gl_pathv));
2065 if (pglob->gl_pathv == NULL) return GLOB_NOSPACE;
2066 pglob->gl_pathv[pathc-1]=dest;
2067 pglob->gl_pathv[pathc]=NULL;
2068 for (s=src; s && *s; s++, dest++) {
2069 if (*s == '\\') s++;
2070 *dest = *s;
2071 }
2072 *dest='\0';
2073 return 0;
2074 }
2075
2076 /* XXX broken if the last character is '\\', check that before calling */
2077 static int glob_needed(const char *s)
2078 {
2079 for (; *s; s++) {
2080 if (*s == '\\') s++;
2081 if (strchr("*[?",*s)) return 1;
2082 }
2083 return 0;
2084 }
2085
2086 #if 0
2087 static void globprint(glob_t *pglob)
2088 {
2089 int i;
2090 debug_printf("glob_t at %p:\n", pglob);
2091 debug_printf(" gl_pathc=%d gl_pathv=%p gl_offs=%d gl_flags=%d\n",
2092 pglob->gl_pathc, pglob->gl_pathv, pglob->gl_offs, pglob->gl_flags);
2093 for (i=0; i<pglob->gl_pathc; i++)
2094 debug_printf("pglob->gl_pathv[%d] = %p = %s\n", i,
2095 pglob->gl_pathv[i], pglob->gl_pathv[i]);
2096 }
2097 #endif
2098
2099 static int xglob(o_string *dest, int flags, glob_t *pglob)
2100 {
2101 int gr;
2102
2103 /* short-circuit for null word */
2104 /* we can code this better when the debug_printf's are gone */
2105 if (dest->length == 0) {
2106 if (dest->nonnull) {
2107 /* bash man page calls this an "explicit" null */
2108 gr = globhack(dest->data, flags, pglob);
2109 debug_printf("globhack returned %d\n",gr);
2110 } else {
2111 return 0;
2112 }
2113 } else if (glob_needed(dest->data)) {
2114 gr = glob(dest->data, flags, NULL, pglob);
2115 debug_printf("glob returned %d\n",gr);
2116 if (gr == GLOB_NOMATCH) {
2117 /* quote removal, or more accurately, backslash removal */
2118 gr = globhack(dest->data, flags, pglob);
2119 debug_printf("globhack returned %d\n",gr);
2120 }
2121 } else {
2122 gr = globhack(dest->data, flags, pglob);
2123 debug_printf("globhack returned %d\n",gr);
2124 }
2125 if (gr == GLOB_NOSPACE)
2126 error_msg_and_die("out of memory during glob");
2127 if (gr != 0) { /* GLOB_ABORTED ? */
2128 error_msg("glob(3) error %d",gr);
2129 }
2130 /* globprint(glob_target); */
2131 return gr;
2132 }
2133 #endif
2134
2135 #ifdef __U_BOOT__
2136 static char *get_dollar_var(char ch);
2137 #endif
2138
2139 /* This is used to get/check local shell variables */
2140 char *get_local_var(const char *s)
2141 {
2142 struct variables *cur;
2143
2144 if (!s)
2145 return NULL;
2146
2147 #ifdef __U_BOOT__
2148 if (*s == '$')
2149 return get_dollar_var(s[1]);
2150 #endif
2151
2152 for (cur = top_vars; cur; cur=cur->next)
2153 if(strcmp(cur->name, s)==0)
2154 return cur->value;
2155 return NULL;
2156 }
2157
2158 /* This is used to set local shell variables
2159 flg_export==0 if only local (not exporting) variable
2160 flg_export==1 if "new" exporting environ
2161 flg_export>1 if current startup environ (not call putenv()) */
2162 int set_local_var(const char *s, int flg_export)
2163 {
2164 char *name, *value;
2165 int result=0;
2166 struct variables *cur;
2167
2168 #ifdef __U_BOOT__
2169 /* might be possible! */
2170 if (!isalpha(*s))
2171 return -1;
2172 #endif
2173
2174 name=strdup(s);
2175
2176 #ifdef __U_BOOT__
2177 if (env_get(name) != NULL) {
2178 printf ("ERROR: "
2179 "There is a global environment variable with the same name.\n");
2180 free(name);
2181 return -1;
2182 }
2183 #endif
2184 /* Assume when we enter this function that we are already in
2185 * NAME=VALUE format. So the first order of business is to
2186 * split 's' on the '=' into 'name' and 'value' */
2187 value = strchr(name, '=');
2188 if (value == NULL || *(value + 1) == 0) {
2189 free(name);
2190 return -1;
2191 }
2192 *value++ = 0;
2193
2194 for(cur = top_vars; cur; cur = cur->next) {
2195 if(strcmp(cur->name, name)==0)
2196 break;
2197 }
2198
2199 if(cur) {
2200 if(strcmp(cur->value, value)==0) {
2201 if(flg_export>0 && cur->flg_export==0)
2202 cur->flg_export=flg_export;
2203 else
2204 result++;
2205 } else {
2206 if(cur->flg_read_only) {
2207 error_msg("%s: readonly variable", name);
2208 result = -1;
2209 } else {
2210 if(flg_export>0 || cur->flg_export>1)
2211 cur->flg_export=1;
2212 free(cur->value);
2213
2214 cur->value = strdup(value);
2215 }
2216 }
2217 } else {
2218 cur = malloc(sizeof(struct variables));
2219 if(!cur) {
2220 result = -1;
2221 } else {
2222 cur->name = strdup(name);
2223 if (cur->name == NULL) {
2224 free(cur);
2225 result = -1;
2226 } else {
2227 struct variables *bottom = top_vars;
2228 cur->value = strdup(value);
2229 cur->next = NULL;
2230 cur->flg_export = flg_export;
2231 cur->flg_read_only = 0;
2232 while(bottom->next) bottom=bottom->next;
2233 bottom->next = cur;
2234 }
2235 }
2236 }
2237
2238 #ifndef __U_BOOT__
2239 if(result==0 && cur->flg_export==1) {
2240 *(value-1) = '=';
2241 result = putenv(name);
2242 } else {
2243 #endif
2244 free(name);
2245 #ifndef __U_BOOT__
2246 if(result>0) /* equivalent to previous set */
2247 result = 0;
2248 }
2249 #endif
2250 return result;
2251 }
2252
2253 void unset_local_var(const char *name)
2254 {
2255 struct variables *cur;
2256
2257 if (name) {
2258 for (cur = top_vars; cur; cur=cur->next) {
2259 if(strcmp(cur->name, name)==0)
2260 break;
2261 }
2262 if (cur != NULL) {
2263 struct variables *next = top_vars;
2264 if(cur->flg_read_only) {
2265 error_msg("%s: readonly variable", name);
2266 return;
2267 } else {
2268 #ifndef __U_BOOT__
2269 if(cur->flg_export)
2270 unenv_set(cur->name);
2271 #endif
2272 free(cur->name);
2273 free(cur->value);
2274 while (next->next != cur)
2275 next = next->next;
2276 next->next = cur->next;
2277 }
2278 free(cur);
2279 }
2280 }
2281 }
2282
2283 static int is_assignment(const char *s)
2284 {
2285 if (s == NULL)
2286 return 0;
2287
2288 if (!isalpha(*s)) return 0;
2289 ++s;
2290 while(isalnum(*s) || *s=='_') ++s;
2291 return *s=='=';
2292 }
2293
2294 #ifndef __U_BOOT__
2295 /* the src parameter allows us to peek forward to a possible &n syntax
2296 * for file descriptor duplication, e.g., "2>&1".
2297 * Return code is 0 normally, 1 if a syntax error is detected in src.
2298 * Resource errors (in xmalloc) cause the process to exit */
2299 static int setup_redirect(struct p_context *ctx, int fd, redir_type style,
2300 struct in_str *input)
2301 {
2302 struct child_prog *child=ctx->child;
2303 struct redir_struct *redir = child->redirects;
2304 struct redir_struct *last_redir=NULL;
2305
2306 /* Create a new redir_struct and drop it onto the end of the linked list */
2307 while(redir) {
2308 last_redir=redir;
2309 redir=redir->next;
2310 }
2311 redir = xmalloc(sizeof(struct redir_struct));
2312 redir->next=NULL;
2313 redir->word.gl_pathv=NULL;
2314 if (last_redir) {
2315 last_redir->next=redir;
2316 } else {
2317 child->redirects=redir;
2318 }
2319
2320 redir->type=style;
2321 redir->fd= (fd==-1) ? redir_table[style].default_fd : fd ;
2322
2323 debug_printf("Redirect type %d%s\n", redir->fd, redir_table[style].descrip);
2324
2325 /* Check for a '2>&1' type redirect */
2326 redir->dup = redirect_dup_num(input);
2327 if (redir->dup == -2) return 1; /* syntax error */
2328 if (redir->dup != -1) {
2329 /* Erik had a check here that the file descriptor in question
2330 * is legit; I postpone that to "run time"
2331 * A "-" representation of "close me" shows up as a -3 here */
2332 debug_printf("Duplicating redirect '%d>&%d'\n", redir->fd, redir->dup);
2333 } else {
2334 /* We do _not_ try to open the file that src points to,
2335 * since we need to return and let src be expanded first.
2336 * Set ctx->pending_redirect, so we know what to do at the
2337 * end of the next parsed word.
2338 */
2339 ctx->pending_redirect = redir;
2340 }
2341 return 0;
2342 }
2343 #endif
2344
2345 static struct pipe *new_pipe(void)
2346 {
2347 struct pipe *pi;
2348 pi = xmalloc(sizeof(struct pipe));
2349 pi->num_progs = 0;
2350 pi->progs = NULL;
2351 pi->next = NULL;
2352 pi->followup = 0; /* invalid */
2353 pi->r_mode = RES_NONE;
2354 return pi;
2355 }
2356
2357 static void initialize_context(struct p_context *ctx)
2358 {
2359 ctx->pipe=NULL;
2360 #ifndef __U_BOOT__
2361 ctx->pending_redirect=NULL;
2362 #endif
2363 ctx->child=NULL;
2364 ctx->list_head=new_pipe();
2365 ctx->pipe=ctx->list_head;
2366 ctx->w=RES_NONE;
2367 ctx->stack=NULL;
2368 #ifdef __U_BOOT__
2369 ctx->old_flag=0;
2370 #endif
2371 done_command(ctx); /* creates the memory for working child */
2372 }
2373
2374 /* normal return is 0
2375 * if a reserved word is found, and processed, return 1
2376 * should handle if, then, elif, else, fi, for, while, until, do, done.
2377 * case, function, and select are obnoxious, save those for later.
2378 */
2379 struct reserved_combo {
2380 char *literal;
2381 int code;
2382 long flag;
2383 };
2384 /* Mostly a list of accepted follow-up reserved words.
2385 * FLAG_END means we are done with the sequence, and are ready
2386 * to turn the compound list into a command.
2387 * FLAG_START means the word must start a new compound list.
2388 */
2389 static struct reserved_combo reserved_list[] = {
2390 { "if", RES_IF, FLAG_THEN | FLAG_START },
2391 { "then", RES_THEN, FLAG_ELIF | FLAG_ELSE | FLAG_FI },
2392 { "elif", RES_ELIF, FLAG_THEN },
2393 { "else", RES_ELSE, FLAG_FI },
2394 { "fi", RES_FI, FLAG_END },
2395 { "for", RES_FOR, FLAG_IN | FLAG_START },
2396 { "while", RES_WHILE, FLAG_DO | FLAG_START },
2397 { "until", RES_UNTIL, FLAG_DO | FLAG_START },
2398 { "in", RES_IN, FLAG_DO },
2399 { "do", RES_DO, FLAG_DONE },
2400 { "done", RES_DONE, FLAG_END }
2401 };
2402 #define NRES (sizeof(reserved_list)/sizeof(struct reserved_combo))
2403
2404 static int reserved_word(o_string *dest, struct p_context *ctx)
2405 {
2406 struct reserved_combo *r;
2407 for (r=reserved_list;
2408 r<reserved_list+NRES; r++) {
2409 if (strcmp(dest->data, r->literal) == 0) {
2410 debug_printf("found reserved word %s, code %d\n",r->literal,r->code);
2411 if (r->flag & FLAG_START) {
2412 struct p_context *new = xmalloc(sizeof(struct p_context));
2413 debug_printf("push stack\n");
2414 if (ctx->w == RES_IN || ctx->w == RES_FOR) {
2415 syntax();
2416 free(new);
2417 ctx->w = RES_SNTX;
2418 b_reset(dest);
2419 return 1;
2420 }
2421 *new = *ctx; /* physical copy */
2422 initialize_context(ctx);
2423 ctx->stack=new;
2424 } else if ( ctx->w == RES_NONE || ! (ctx->old_flag & (1<<r->code))) {
2425 syntax();
2426 ctx->w = RES_SNTX;
2427 b_reset(dest);
2428 return 1;
2429 }
2430 ctx->w=r->code;
2431 ctx->old_flag = r->flag;
2432 if (ctx->old_flag & FLAG_END) {
2433 struct p_context *old;
2434 debug_printf("pop stack\n");
2435 done_pipe(ctx,PIPE_SEQ);
2436 old = ctx->stack;
2437 old->child->group = ctx->list_head;
2438 #ifndef __U_BOOT__
2439 old->child->subshell = 0;
2440 #endif
2441 *ctx = *old; /* physical copy */
2442 free(old);
2443 }
2444 b_reset (dest);
2445 return 1;
2446 }
2447 }
2448 return 0;
2449 }
2450
2451 /* normal return is 0.
2452 * Syntax or xglob errors return 1. */
2453 static int done_word(o_string *dest, struct p_context *ctx)
2454 {
2455 struct child_prog *child=ctx->child;
2456 #ifndef __U_BOOT__
2457 glob_t *glob_target;
2458 int gr, flags = 0;
2459 #else
2460 char *str, *s;
2461 int argc, cnt;
2462 #endif
2463
2464 debug_printf("done_word: %s %p\n", dest->data, child);
2465 if (dest->length == 0 && !dest->nonnull) {
2466 debug_printf(" true null, ignored\n");
2467 return 0;
2468 }
2469 #ifndef __U_BOOT__
2470 if (ctx->pending_redirect) {
2471 glob_target = &ctx->pending_redirect->word;
2472 } else {
2473 #endif
2474 if (child->group) {
2475 syntax();
2476 return 1; /* syntax error, groups and arglists don't mix */
2477 }
2478 if (!child->argv && (ctx->type & FLAG_PARSE_SEMICOLON)) {
2479 debug_printf("checking %s for reserved-ness\n",dest->data);
2480 if (reserved_word(dest,ctx)) return ctx->w==RES_SNTX;
2481 }
2482 #ifndef __U_BOOT__
2483 glob_target = &child->glob_result;
2484 if (child->argv) flags |= GLOB_APPEND;
2485 #else
2486 for (cnt = 1, s = dest->data; s && *s; s++) {
2487 if (*s == '\\') s++;
2488 cnt++;
2489 }
2490 str = malloc(cnt);
2491 if (!str) return 1;
2492 if ( child->argv == NULL) {
2493 child->argc=0;
2494 }
2495 argc = ++child->argc;
2496 child->argv = realloc(child->argv, (argc+1)*sizeof(*child->argv));
2497 if (child->argv == NULL) {
2498 free(str);
2499 return 1;
2500 }
2501 child->argv_nonnull = realloc(child->argv_nonnull,
2502 (argc+1)*sizeof(*child->argv_nonnull));
2503 if (child->argv_nonnull == NULL) {
2504 free(str);
2505 return 1;
2506 }
2507 child->argv[argc-1]=str;
2508 child->argv_nonnull[argc-1] = dest->nonnull;
2509 child->argv[argc]=NULL;
2510 child->argv_nonnull[argc] = 0;
2511 for (s = dest->data; s && *s; s++,str++) {
2512 if (*s == '\\') s++;
2513 *str = *s;
2514 }
2515 *str = '\0';
2516 #endif
2517 #ifndef __U_BOOT__
2518 }
2519 gr = xglob(dest, flags, glob_target);
2520 if (gr != 0) return 1;
2521 #endif
2522
2523 b_reset(dest);
2524 #ifndef __U_BOOT__
2525 if (ctx->pending_redirect) {
2526 ctx->pending_redirect=NULL;
2527 if (glob_target->gl_pathc != 1) {
2528 error_msg("ambiguous redirect");
2529 return 1;
2530 }
2531 } else {
2532 child->argv = glob_target->gl_pathv;
2533 }
2534 #endif
2535 if (ctx->w == RES_FOR) {
2536 done_word(dest,ctx);
2537 done_pipe(ctx,PIPE_SEQ);
2538 }
2539 return 0;
2540 }
2541
2542 /* The only possible error here is out of memory, in which case
2543 * xmalloc exits. */
2544 static int done_command(struct p_context *ctx)
2545 {
2546 /* The child is really already in the pipe structure, so
2547 * advance the pipe counter and make a new, null child.
2548 * Only real trickiness here is that the uncommitted
2549 * child structure, to which ctx->child points, is not
2550 * counted in pi->num_progs. */
2551 struct pipe *pi=ctx->pipe;
2552 struct child_prog *prog=ctx->child;
2553
2554 if (prog && prog->group == NULL
2555 && prog->argv == NULL
2556 #ifndef __U_BOOT__
2557 && prog->redirects == NULL) {
2558 #else
2559 ) {
2560 #endif
2561 debug_printf("done_command: skipping null command\n");
2562 return 0;
2563 } else if (prog) {
2564 pi->num_progs++;
2565 debug_printf("done_command: num_progs incremented to %d\n",pi->num_progs);
2566 } else {
2567 debug_printf("done_command: initializing\n");
2568 }
2569 pi->progs = xrealloc(pi->progs, sizeof(*pi->progs) * (pi->num_progs+1));
2570
2571 prog = pi->progs + pi->num_progs;
2572 #ifndef __U_BOOT__
2573 prog->redirects = NULL;
2574 #endif
2575 prog->argv = NULL;
2576 prog->argv_nonnull = NULL;
2577 #ifndef __U_BOOT__
2578 prog->is_stopped = 0;
2579 #endif
2580 prog->group = NULL;
2581 #ifndef __U_BOOT__
2582 prog->glob_result.gl_pathv = NULL;
2583 prog->family = pi;
2584 #endif
2585 prog->sp = 0;
2586 ctx->child = prog;
2587 prog->type = ctx->type;
2588
2589 /* but ctx->pipe and ctx->list_head remain unchanged */
2590 return 0;
2591 }
2592
2593 static int done_pipe(struct p_context *ctx, pipe_style type)
2594 {
2595 struct pipe *new_p;
2596 done_command(ctx); /* implicit closure of previous command */
2597 debug_printf("done_pipe, type %d\n", type);
2598 ctx->pipe->followup = type;
2599 ctx->pipe->r_mode = ctx->w;
2600 new_p=new_pipe();
2601 ctx->pipe->next = new_p;
2602 ctx->pipe = new_p;
2603 ctx->child = NULL;
2604 done_command(ctx); /* set up new pipe to accept commands */
2605 return 0;
2606 }
2607
2608 #ifndef __U_BOOT__
2609 /* peek ahead in the in_str to find out if we have a "&n" construct,
2610 * as in "2>&1", that represents duplicating a file descriptor.
2611 * returns either -2 (syntax error), -1 (no &), or the number found.
2612 */
2613 static int redirect_dup_num(struct in_str *input)
2614 {
2615 int ch, d=0, ok=0;
2616 ch = b_peek(input);
2617 if (ch != '&') return -1;
2618
2619 b_getch(input); /* get the & */
2620 ch=b_peek(input);
2621 if (ch == '-') {
2622 b_getch(input);
2623 return -3; /* "-" represents "close me" */
2624 }
2625 while (isdigit(ch)) {
2626 d = d*10+(ch-'0');
2627 ok=1;
2628 b_getch(input);
2629 ch = b_peek(input);
2630 }
2631 if (ok) return d;
2632
2633 error_msg("ambiguous redirect");
2634 return -2;
2635 }
2636
2637 /* If a redirect is immediately preceded by a number, that number is
2638 * supposed to tell which file descriptor to redirect. This routine
2639 * looks for such preceding numbers. In an ideal world this routine
2640 * needs to handle all the following classes of redirects...
2641 * echo 2>foo # redirects fd 2 to file "foo", nothing passed to echo
2642 * echo 49>foo # redirects fd 49 to file "foo", nothing passed to echo
2643 * echo -2>foo # redirects fd 1 to file "foo", "-2" passed to echo
2644 * echo 49x>foo # redirects fd 1 to file "foo", "49x" passed to echo
2645 * A -1 output from this program means no valid number was found, so the
2646 * caller should use the appropriate default for this redirection.
2647 */
2648 static int redirect_opt_num(o_string *o)
2649 {
2650 int num;
2651
2652 if (o->length==0) return -1;
2653 for(num=0; num<o->length; num++) {
2654 if (!isdigit(*(o->data+num))) {
2655 return -1;
2656 }
2657 }
2658 /* reuse num (and save an int) */
2659 num=atoi(o->data);
2660 b_reset(o);
2661 return num;
2662 }
2663
2664 FILE *generate_stream_from_list(struct pipe *head)
2665 {
2666 FILE *pf;
2667 #if 1
2668 int pid, channel[2];
2669 if (pipe(channel)<0) perror_msg_and_die("pipe");
2670 pid=fork();
2671 if (pid<0) {
2672 perror_msg_and_die("fork");
2673 } else if (pid==0) {
2674 close(channel[0]);
2675 if (channel[1] != 1) {
2676 dup2(channel[1],1);
2677 close(channel[1]);
2678 }
2679 #if 0
2680 #define SURROGATE "surrogate response"
2681 write(1,SURROGATE,sizeof(SURROGATE));
2682 _exit(run_list(head));
2683 #else
2684 _exit(run_list_real(head)); /* leaks memory */
2685 #endif
2686 }
2687 debug_printf("forked child %d\n",pid);
2688 close(channel[1]);
2689 pf = fdopen(channel[0],"r");
2690 debug_printf("pipe on FILE *%p\n",pf);
2691 #else
2692 free_pipe_list(head,0);
2693 pf=popen("echo surrogate response","r");
2694 debug_printf("started fake pipe on FILE *%p\n",pf);
2695 #endif
2696 return pf;
2697 }
2698
2699 /* this version hacked for testing purposes */
2700 /* return code is exit status of the process that is run. */
2701 static int process_command_subs(o_string *dest, struct p_context *ctx, struct in_str *input, int subst_end)
2702 {
2703 int retcode;
2704 o_string result=NULL_O_STRING;
2705 struct p_context inner;
2706 FILE *p;
2707 struct in_str pipe_str;
2708 initialize_context(&inner);
2709
2710 /* recursion to generate command */
2711 retcode = parse_stream(&result, &inner, input, subst_end);
2712 if (retcode != 0) return retcode; /* syntax error or EOF */
2713 done_word(&result, &inner);
2714 done_pipe(&inner, PIPE_SEQ);
2715 b_free(&result);
2716
2717 p=generate_stream_from_list(inner.list_head);
2718 if (p==NULL) return 1;
2719 mark_open(fileno(p));
2720 setup_file_in_str(&pipe_str, p);
2721
2722 /* now send results of command back into original context */
2723 retcode = parse_stream(dest, ctx, &pipe_str, '\0');
2724 /* XXX In case of a syntax error, should we try to kill the child?
2725 * That would be tough to do right, so just read until EOF. */
2726 if (retcode == 1) {
2727 while (b_getch(&pipe_str)!=EOF) { /* discard */ };
2728 }
2729
2730 debug_printf("done reading from pipe, pclose()ing\n");
2731 /* This is the step that wait()s for the child. Should be pretty
2732 * safe, since we just read an EOF from its stdout. We could try
2733 * to better, by using wait(), and keeping track of background jobs
2734 * at the same time. That would be a lot of work, and contrary
2735 * to the KISS philosophy of this program. */
2736 mark_closed(fileno(p));
2737 retcode=pclose(p);
2738 free_pipe_list(inner.list_head,0);
2739 debug_printf("pclosed, retcode=%d\n",retcode);
2740 /* XXX this process fails to trim a single trailing newline */
2741 return retcode;
2742 }
2743
2744 static int parse_group(o_string *dest, struct p_context *ctx,
2745 struct in_str *input, int ch)
2746 {
2747 int rcode, endch=0;
2748 struct p_context sub;
2749 struct child_prog *child = ctx->child;
2750 if (child->argv) {
2751 syntax();
2752 return 1; /* syntax error, groups and arglists don't mix */
2753 }
2754 initialize_context(&sub);
2755 switch(ch) {
2756 case '(': endch=')'; child->subshell=1; break;
2757 case '{': endch='}'; break;
2758 default: syntax(); /* really logic error */
2759 }
2760 rcode=parse_stream(dest,&sub,input,endch);
2761 done_word(dest,&sub); /* finish off the final word in the subcontext */
2762 done_pipe(&sub, PIPE_SEQ); /* and the final command there, too */
2763 child->group = sub.list_head;
2764 return rcode;
2765 /* child remains "open", available for possible redirects */
2766 }
2767 #endif
2768
2769 /* basically useful version until someone wants to get fancier,
2770 * see the bash man page under "Parameter Expansion" */
2771 static char *lookup_param(char *src)
2772 {
2773 char *p;
2774 char *sep;
2775 char *default_val = NULL;
2776 int assign = 0;
2777 int expand_empty = 0;
2778
2779 if (!src)
2780 return NULL;
2781
2782 sep = strchr(src, ':');
2783
2784 if (sep) {
2785 *sep = '\0';
2786 if (*(sep + 1) == '-')
2787 default_val = sep+2;
2788 if (*(sep + 1) == '=') {
2789 default_val = sep+2;
2790 assign = 1;
2791 }
2792 if (*(sep + 1) == '+') {
2793 default_val = sep+2;
2794 expand_empty = 1;
2795 }
2796 }
2797
2798 p = env_get(src);
2799 if (!p)
2800 p = get_local_var(src);
2801
2802 if (!p || strlen(p) == 0) {
2803 p = default_val;
2804 if (assign) {
2805 char *var = malloc(strlen(src)+strlen(default_val)+2);
2806 if (var) {
2807 sprintf(var, "%s=%s", src, default_val);
2808 set_local_var(var, 0);
2809 }
2810 free(var);
2811 }
2812 } else if (expand_empty) {
2813 p += strlen(p);
2814 }
2815
2816 if (sep)
2817 *sep = ':';
2818
2819 return p;
2820 }
2821
2822 #ifdef __U_BOOT__
2823 static char *get_dollar_var(char ch)
2824 {
2825 static char buf[40];
2826
2827 buf[0] = '\0';
2828 switch (ch) {
2829 case '?':
2830 sprintf(buf, "%u", (unsigned int)last_return_code);
2831 break;
2832 default:
2833 return NULL;
2834 }
2835 return buf;
2836 }
2837 #endif
2838
2839 /* return code: 0 for OK, 1 for syntax error */
2840 static int handle_dollar(o_string *dest, struct p_context *ctx, struct in_str *input)
2841 {
2842 #ifndef __U_BOOT__
2843 int i, advance=0;
2844 #else
2845 int advance=0;
2846 #endif
2847 #ifndef __U_BOOT__
2848 char sep[]=" ";
2849 #endif
2850 int ch = input->peek(input); /* first character after the $ */
2851 debug_printf("handle_dollar: ch=%c\n",ch);
2852 if (isalpha(ch)) {
2853 b_addchr(dest, SPECIAL_VAR_SYMBOL);
2854 ctx->child->sp++;
2855 while(ch=b_peek(input),isalnum(ch) || ch=='_') {
2856 b_getch(input);
2857 b_addchr(dest,ch);
2858 }
2859 b_addchr(dest, SPECIAL_VAR_SYMBOL);
2860 #ifndef __U_BOOT__
2861 } else if (isdigit(ch)) {
2862 i = ch-'0'; /* XXX is $0 special? */
2863 if (i<global_argc) {
2864 parse_string(dest, ctx, global_argv[i]); /* recursion */
2865 }
2866 advance = 1;
2867 #endif
2868 } else switch (ch) {
2869 #ifndef __U_BOOT__
2870 case '$':
2871 b_adduint(dest,getpid());
2872 advance = 1;
2873 break;
2874 case '!':
2875 if (last_bg_pid > 0) b_adduint(dest, last_bg_pid);
2876 advance = 1;
2877 break;
2878 #endif
2879 case '?':
2880 #ifndef __U_BOOT__
2881 b_adduint(dest,last_return_code);
2882 #else
2883 ctx->child->sp++;
2884 b_addchr(dest, SPECIAL_VAR_SYMBOL);
2885 b_addchr(dest, '$');
2886 b_addchr(dest, '?');
2887 b_addchr(dest, SPECIAL_VAR_SYMBOL);
2888 #endif
2889 advance = 1;
2890 break;
2891 #ifndef __U_BOOT__
2892 case '#':
2893 b_adduint(dest,global_argc ? global_argc-1 : 0);
2894 advance = 1;
2895 break;
2896 #endif
2897 case '{':
2898 b_addchr(dest, SPECIAL_VAR_SYMBOL);
2899 ctx->child->sp++;
2900 b_getch(input);
2901 /* XXX maybe someone will try to escape the '}' */
2902 while(ch=b_getch(input),ch!=EOF && ch!='}') {
2903 b_addchr(dest,ch);
2904 }
2905 if (ch != '}') {
2906 syntax();
2907 return 1;
2908 }
2909 b_addchr(dest, SPECIAL_VAR_SYMBOL);
2910 break;
2911 #ifndef __U_BOOT__
2912 case '(':
2913 b_getch(input);
2914 process_command_subs(dest, ctx, input, ')');
2915 break;
2916 case '*':
2917 sep[0]=ifs[0];
2918 for (i=1; i<global_argc; i++) {
2919 parse_string(dest, ctx, global_argv[i]);
2920 if (i+1 < global_argc) parse_string(dest, ctx, sep);
2921 }
2922 break;
2923 case '@':
2924 case '-':
2925 case '_':
2926 /* still unhandled, but should be eventually */
2927 error_msg("unhandled syntax: $%c",ch);
2928 return 1;
2929 break;
2930 #endif
2931 default:
2932 b_addqchr(dest,'$',dest->quote);
2933 }
2934 /* Eat the character if the flag was set. If the compiler
2935 * is smart enough, we could substitute "b_getch(input);"
2936 * for all the "advance = 1;" above, and also end up with
2937 * a nice size-optimized program. Hah! That'll be the day.
2938 */
2939 if (advance) b_getch(input);
2940 return 0;
2941 }
2942
2943 #ifndef __U_BOOT__
2944 int parse_string(o_string *dest, struct p_context *ctx, const char *src)
2945 {
2946 struct in_str foo;
2947 setup_string_in_str(&foo, src);
2948 return parse_stream(dest, ctx, &foo, '\0');
2949 }
2950 #endif
2951
2952 /* return code is 0 for normal exit, 1 for syntax error */
2953 static int parse_stream(o_string *dest, struct p_context *ctx,
2954 struct in_str *input, int end_trigger)
2955 {
2956 unsigned int ch, m;
2957 #ifndef __U_BOOT__
2958 int redir_fd;
2959 redir_type redir_style;
2960 #endif
2961 int next;
2962
2963 /* Only double-quote state is handled in the state variable dest->quote.
2964 * A single-quote triggers a bypass of the main loop until its mate is
2965 * found. When recursing, quote state is passed in via dest->quote. */
2966
2967 debug_printf("parse_stream, end_trigger=%d\n",end_trigger);
2968 while ((ch=b_getch(input))!=EOF) {
2969 m = map[ch];
2970 #ifdef __U_BOOT__
2971 if (input->__promptme == 0) return 1;
2972 #endif
2973 next = (ch == '\n') ? 0 : b_peek(input);
2974
2975 debug_printf("parse_stream: ch=%c (%d) m=%d quote=%d - %c\n",
2976 ch >= ' ' ? ch : '.', ch, m,
2977 dest->quote, ctx->stack == NULL ? '*' : '.');
2978
2979 if (m==0 || ((m==1 || m==2) && dest->quote)) {
2980 b_addqchr(dest, ch, dest->quote);
2981 } else {
2982 if (m==2) { /* unquoted IFS */
2983 if (done_word(dest, ctx)) {
2984 return 1;
2985 }
2986 /* If we aren't performing a substitution, treat a newline as a
2987 * command separator. */
2988 if (end_trigger != '\0' && ch=='\n')
2989 done_pipe(ctx,PIPE_SEQ);
2990 }
2991 if (ch == end_trigger && !dest->quote && ctx->w==RES_NONE) {
2992 debug_printf("leaving parse_stream (triggered)\n");
2993 return 0;
2994 }
2995 #if 0
2996 if (ch=='\n') {
2997 /* Yahoo! Time to run with it! */
2998 done_pipe(ctx,PIPE_SEQ);
2999 run_list(ctx->list_head);
3000 initialize_context(ctx);
3001 }
3002 #endif
3003 if (m!=2) switch (ch) {
3004 case '#':
3005 if (dest->length == 0 && !dest->quote) {
3006 while(ch=b_peek(input),ch!=EOF && ch!='\n') { b_getch(input); }
3007 } else {
3008 b_addqchr(dest, ch, dest->quote);
3009 }
3010 break;
3011 case '\\':
3012 if (next == EOF) {
3013 syntax();
3014 return 1;
3015 }
3016 b_addqchr(dest, '\\', dest->quote);
3017 b_addqchr(dest, b_getch(input), dest->quote);
3018 break;
3019 case '$':
3020 if (handle_dollar(dest, ctx, input)!=0) return 1;
3021 break;
3022 case '\'':
3023 dest->nonnull = 1;
3024 while(ch=b_getch(input),ch!=EOF && ch!='\'') {
3025 #ifdef __U_BOOT__
3026 if(input->__promptme == 0) return 1;
3027 #endif
3028 b_addchr(dest,ch);
3029 }
3030 if (ch==EOF) {
3031 syntax();
3032 return 1;
3033 }
3034 break;
3035 case '"':
3036 dest->nonnull = 1;
3037 dest->quote = !dest->quote;
3038 break;
3039 #ifndef __U_BOOT__
3040 case '`':
3041 process_command_subs(dest, ctx, input, '`');
3042 break;
3043 case '>':
3044 redir_fd = redirect_opt_num(dest);
3045 done_word(dest, ctx);
3046 redir_style=REDIRECT_OVERWRITE;
3047 if (next == '>') {
3048 redir_style=REDIRECT_APPEND;
3049 b_getch(input);
3050 } else if (next == '(') {
3051 syntax(); /* until we support >(list) Process Substitution */
3052 return 1;
3053 }
3054 setup_redirect(ctx, redir_fd, redir_style, input);
3055 break;
3056 case '<':
3057 redir_fd = redirect_opt_num(dest);
3058 done_word(dest, ctx);
3059 redir_style=REDIRECT_INPUT;
3060 if (next == '<') {
3061 redir_style=REDIRECT_HEREIS;
3062 b_getch(input);
3063 } else if (next == '>') {
3064 redir_style=REDIRECT_IO;
3065 b_getch(input);
3066 } else if (next == '(') {
3067 syntax(); /* until we support <(list) Process Substitution */
3068 return 1;
3069 }
3070 setup_redirect(ctx, redir_fd, redir_style, input);
3071 break;
3072 #endif
3073 case ';':
3074 done_word(dest, ctx);
3075 done_pipe(ctx,PIPE_SEQ);
3076 break;
3077 case '&':
3078 done_word(dest, ctx);
3079 if (next=='&') {
3080 b_getch(input);
3081 done_pipe(ctx,PIPE_AND);
3082 } else {
3083 #ifndef __U_BOOT__
3084 done_pipe(ctx,PIPE_BG);
3085 #else
3086 syntax_err();
3087 return 1;
3088 #endif
3089 }
3090 break;
3091 case '|':
3092 done_word(dest, ctx);
3093 if (next=='|') {
3094 b_getch(input);
3095 done_pipe(ctx,PIPE_OR);
3096 } else {
3097 /* we could pick up a file descriptor choice here
3098 * with redirect_opt_num(), but bash doesn't do it.
3099 * "echo foo 2| cat" yields "foo 2". */
3100 #ifndef __U_BOOT__
3101 done_command(ctx);
3102 #else
3103 syntax_err();
3104 return 1;
3105 #endif
3106 }
3107 break;
3108 #ifndef __U_BOOT__
3109 case '(':
3110 case '{':
3111 if (parse_group(dest, ctx, input, ch)!=0) return 1;
3112 break;
3113 case ')':
3114 case '}':
3115 syntax(); /* Proper use of this character caught by end_trigger */
3116 return 1;
3117 break;
3118 #endif
3119 case SUBSTED_VAR_SYMBOL:
3120 dest->nonnull = 1;
3121 while (ch = b_getch(input), ch != EOF &&
3122 ch != SUBSTED_VAR_SYMBOL) {
3123 debug_printf("subst, pass=%d\n", ch);
3124 if (input->__promptme == 0)
3125 return 1;
3126 b_addchr(dest, ch);
3127 }
3128 debug_printf("subst, term=%d\n", ch);
3129 if (ch == EOF) {
3130 syntax();
3131 return 1;
3132 }
3133 break;
3134 default:
3135 syntax(); /* this is really an internal logic error */
3136 return 1;
3137 }
3138 }
3139 }
3140 /* complain if quote? No, maybe we just finished a command substitution
3141 * that was quoted. Example:
3142 * $ echo "`cat foo` plus more"
3143 * and we just got the EOF generated by the subshell that ran "cat foo"
3144 * The only real complaint is if we got an EOF when end_trigger != '\0',
3145 * that is, we were really supposed to get end_trigger, and never got
3146 * one before the EOF. Can't use the standard "syntax error" return code,
3147 * so that parse_stream_outer can distinguish the EOF and exit smoothly. */
3148 debug_printf("leaving parse_stream (EOF)\n");
3149 if (end_trigger != '\0') return -1;
3150 return 0;
3151 }
3152
3153 static void mapset(const unsigned char *set, int code)
3154 {
3155 const unsigned char *s;
3156 for (s=set; *s; s++) map[*s] = code;
3157 }
3158
3159 static void update_ifs_map(void)
3160 {
3161 /* char *ifs and char map[256] are both globals. */
3162 ifs = (uchar *)env_get("IFS");
3163 if (ifs == NULL) ifs=(uchar *)" \t\n";
3164 /* Precompute a list of 'flow through' behavior so it can be treated
3165 * quickly up front. Computation is necessary because of IFS.
3166 * Special case handling of IFS == " \t\n" is not implemented.
3167 * The map[] array only really needs two bits each, and on most machines
3168 * that would be faster because of the reduced L1 cache footprint.
3169 */
3170 memset(map,0,sizeof(map)); /* most characters flow through always */
3171 #ifndef __U_BOOT__
3172 mapset((uchar *)"\\$'\"`", 3); /* never flow through */
3173 mapset((uchar *)"<>;&|(){}#", 1); /* flow through if quoted */
3174 #else
3175 {
3176 uchar subst[2] = {SUBSTED_VAR_SYMBOL, 0};
3177 mapset(subst, 3); /* never flow through */
3178 }
3179 mapset((uchar *)"\\$'\"", 3); /* never flow through */
3180 mapset((uchar *)";&|#", 1); /* flow through if quoted */
3181 #endif
3182 mapset(ifs, 2); /* also flow through if quoted */
3183 }
3184
3185 /* most recursion does not come through here, the exeception is
3186 * from builtin_source() */
3187 static int parse_stream_outer(struct in_str *inp, int flag)
3188 {
3189
3190 struct p_context ctx;
3191 o_string temp=NULL_O_STRING;
3192 int rcode;
3193 #ifdef __U_BOOT__
3194 int code = 1;
3195 #endif
3196 do {
3197 ctx.type = flag;
3198 initialize_context(&ctx);
3199 update_ifs_map();
3200 if (!(flag & FLAG_PARSE_SEMICOLON) || (flag & FLAG_REPARSING)) mapset((uchar *)";$&|", 0);
3201 inp->promptmode=1;
3202 rcode = parse_stream(&temp, &ctx, inp,
3203 flag & FLAG_CONT_ON_NEWLINE ? -1 : '\n');
3204 #ifdef __U_BOOT__
3205 if (rcode == 1) flag_repeat = 0;
3206 #endif
3207 if (rcode != 1 && ctx.old_flag != 0) {
3208 syntax();
3209 #ifdef __U_BOOT__
3210 flag_repeat = 0;
3211 #endif
3212 }
3213 if (rcode != 1 && ctx.old_flag == 0) {
3214 done_word(&temp, &ctx);
3215 done_pipe(&ctx,PIPE_SEQ);
3216 #ifndef __U_BOOT__
3217 run_list(ctx.list_head);
3218 #else
3219 code = run_list(ctx.list_head);
3220 if (code == -2) { /* exit */
3221 b_free(&temp);
3222 code = 0;
3223 /* XXX hackish way to not allow exit from main loop */
3224 if (inp->peek == file_peek) {
3225 printf("exit not allowed from main input shell.\n");
3226 continue;
3227 }
3228 break;
3229 }
3230 if (code == -1)
3231 flag_repeat = 0;
3232 #endif
3233 } else {
3234 if (ctx.old_flag != 0) {
3235 free(ctx.stack);
3236 b_reset(&temp);
3237 }
3238 #ifdef __U_BOOT__
3239 if (inp->__promptme == 0) printf("<INTERRUPT>\n");
3240 inp->__promptme = 1;
3241 #endif
3242 temp.nonnull = 0;
3243 temp.quote = 0;
3244 inp->p = NULL;
3245 free_pipe_list(ctx.list_head,0);
3246 }
3247 b_free(&temp);
3248 /* loop on syntax errors, return on EOF */
3249 } while (rcode != -1 && !(flag & FLAG_EXIT_FROM_LOOP) &&
3250 (inp->peek != static_peek || b_peek(inp)));
3251 #ifndef __U_BOOT__
3252 return 0;
3253 #else
3254 return (code != 0) ? 1 : 0;
3255 #endif /* __U_BOOT__ */
3256 }
3257
3258 #ifndef __U_BOOT__
3259 static int parse_string_outer(const char *s, int flag)
3260 #else
3261 int parse_string_outer(const char *s, int flag)
3262 #endif /* __U_BOOT__ */
3263 {
3264 struct in_str input;
3265 #ifdef __U_BOOT__
3266 char *p = NULL;
3267 int rcode;
3268 if (!s)
3269 return 1;
3270 if (!*s)
3271 return 0;
3272 if (!(p = strchr(s, '\n')) || *++p) {
3273 p = xmalloc(strlen(s) + 2);
3274 strcpy(p, s);
3275 strcat(p, "\n");
3276 setup_string_in_str(&input, p);
3277 rcode = parse_stream_outer(&input, flag);
3278 free(p);
3279 return rcode;
3280 } else {
3281 #endif
3282 setup_string_in_str(&input, s);
3283 return parse_stream_outer(&input, flag);
3284 #ifdef __U_BOOT__
3285 }
3286 #endif
3287 }
3288
3289 #ifndef __U_BOOT__
3290 static int parse_file_outer(FILE *f)
3291 #else
3292 int parse_file_outer(void)
3293 #endif
3294 {
3295 int rcode;
3296 struct in_str input;
3297 #ifndef __U_BOOT__
3298 setup_file_in_str(&input, f);
3299 #else
3300 setup_file_in_str(&input);
3301 #endif
3302 rcode = parse_stream_outer(&input, FLAG_PARSE_SEMICOLON);
3303 return rcode;
3304 }
3305
3306 #ifdef __U_BOOT__
3307 #ifdef CONFIG_NEEDS_MANUAL_RELOC
3308 static void u_boot_hush_reloc(void)
3309 {
3310 unsigned long addr;
3311 struct reserved_combo *r;
3312
3313 for (r=reserved_list; r<reserved_list+NRES; r++) {
3314 addr = (ulong) (r->literal) + gd->reloc_off;
3315 r->literal = (char *)addr;
3316 }
3317 }
3318 #endif
3319
3320 int u_boot_hush_start(void)
3321 {
3322 if (top_vars == NULL) {
3323 top_vars = malloc(sizeof(struct variables));
3324 top_vars->name = "HUSH_VERSION";
3325 top_vars->value = "0.01";
3326 top_vars->next = NULL;
3327 top_vars->flg_export = 0;
3328 top_vars->flg_read_only = 1;
3329 #ifdef CONFIG_NEEDS_MANUAL_RELOC
3330 u_boot_hush_reloc();
3331 #endif
3332 }
3333 return 0;
3334 }
3335
3336 static void *xmalloc(size_t size)
3337 {
3338 void *p = NULL;
3339
3340 if (!(p = malloc(size))) {
3341 printf("ERROR : memory not allocated\n");
3342 for(;;);
3343 }
3344 return p;
3345 }
3346
3347 static void *xrealloc(void *ptr, size_t size)
3348 {
3349 void *p = NULL;
3350
3351 if (!(p = realloc(ptr, size))) {
3352 printf("ERROR : memory not allocated\n");
3353 for(;;);
3354 }
3355 return p;
3356 }
3357 #endif /* __U_BOOT__ */
3358
3359 #ifndef __U_BOOT__
3360 /* Make sure we have a controlling tty. If we get started under a job
3361 * aware app (like bash for example), make sure we are now in charge so
3362 * we don't fight over who gets the foreground */
3363 static void setup_job_control(void)
3364 {
3365 static pid_t shell_pgrp;
3366 /* Loop until we are in the foreground. */
3367 while (tcgetpgrp (shell_terminal) != (shell_pgrp = getpgrp ()))
3368 kill (- shell_pgrp, SIGTTIN);
3369
3370 /* Ignore interactive and job-control signals. */
3371 signal(SIGINT, SIG_IGN);
3372 signal(SIGQUIT, SIG_IGN);
3373 signal(SIGTERM, SIG_IGN);
3374 signal(SIGTSTP, SIG_IGN);
3375 signal(SIGTTIN, SIG_IGN);
3376 signal(SIGTTOU, SIG_IGN);
3377 signal(SIGCHLD, SIG_IGN);
3378
3379 /* Put ourselves in our own process group. */
3380 setsid();
3381 shell_pgrp = getpid ();
3382 setpgid (shell_pgrp, shell_pgrp);
3383
3384 /* Grab control of the terminal. */
3385 tcsetpgrp(shell_terminal, shell_pgrp);
3386 }
3387
3388 int hush_main(int argc, char * const *argv)
3389 {
3390 int opt;
3391 FILE *input;
3392 char **e = environ;
3393
3394 /* XXX what should these be while sourcing /etc/profile? */
3395 global_argc = argc;
3396 global_argv = argv;
3397
3398 /* (re?) initialize globals. Sometimes hush_main() ends up calling
3399 * hush_main(), therefore we cannot rely on the BSS to zero out this
3400 * stuff. Reset these to 0 every time. */
3401 ifs = NULL;
3402 /* map[] is taken care of with call to update_ifs_map() */
3403 fake_mode = 0;
3404 interactive = 0;
3405 close_me_head = NULL;
3406 last_bg_pid = 0;
3407 job_list = NULL;
3408 last_jobid = 0;
3409
3410 /* Initialize some more globals to non-zero values */
3411 set_cwd();
3412 #ifdef CONFIG_FEATURE_COMMAND_EDITING
3413 cmdedit_set_initial_prompt();
3414 #else
3415 PS1 = NULL;
3416 #endif
3417 PS2 = "> ";
3418
3419 /* initialize our shell local variables with the values
3420 * currently living in the environment */
3421 if (e) {
3422 for (; *e; e++)
3423 set_local_var(*e, 2); /* without call putenv() */
3424 }
3425
3426 last_return_code=EXIT_SUCCESS;
3427
3428
3429 if (argv[0] && argv[0][0] == '-') {
3430 debug_printf("\nsourcing /etc/profile\n");
3431 if ((input = fopen("/etc/profile", "r")) != NULL) {
3432 mark_open(fileno(input));
3433 parse_file_outer(input);
3434 mark_closed(fileno(input));
3435 fclose(input);
3436 }
3437 }
3438 input=stdin;
3439
3440 while ((opt = getopt(argc, argv, "c:xif")) > 0) {
3441 switch (opt) {
3442 case 'c':
3443 {
3444 global_argv = argv+optind;
3445 global_argc = argc-optind;
3446 opt = parse_string_outer(optarg, FLAG_PARSE_SEMICOLON);
3447 goto final_return;
3448 }
3449 break;
3450 case 'i':
3451 interactive++;
3452 break;
3453 case 'f':
3454 fake_mode++;
3455 break;
3456 default:
3457 #ifndef BB_VER
3458 fprintf(stderr, "Usage: sh [FILE]...\n"
3459 " or: sh -c command [args]...\n\n");
3460 exit(EXIT_FAILURE);
3461 #else
3462 show_usage();
3463 #endif
3464 }
3465 }
3466 /* A shell is interactive if the `-i' flag was given, or if all of
3467 * the following conditions are met:
3468 * no -c command
3469 * no arguments remaining or the -s flag given
3470 * standard input is a terminal
3471 * standard output is a terminal
3472 * Refer to Posix.2, the description of the `sh' utility. */
3473 if (argv[optind]==NULL && input==stdin &&
3474 isatty(fileno(stdin)) && isatty(fileno(stdout))) {
3475 interactive++;
3476 }
3477
3478 debug_printf("\ninteractive=%d\n", interactive);
3479 if (interactive) {
3480 /* Looks like they want an interactive shell */
3481 #ifndef CONFIG_FEATURE_SH_EXTRA_QUIET
3482 printf( "\n\n" BB_BANNER " hush - the humble shell v0.01 (testing)\n");
3483 printf( "Enter 'help' for a list of built-in commands.\n\n");
3484 #endif
3485 setup_job_control();
3486 }
3487
3488 if (argv[optind]==NULL) {
3489 opt=parse_file_outer(stdin);
3490 goto final_return;
3491 }
3492
3493 debug_printf("\nrunning script '%s'\n", argv[optind]);
3494 global_argv = argv+optind;
3495 global_argc = argc-optind;
3496 input = xfopen(argv[optind], "r");
3497 opt = parse_file_outer(input);
3498
3499 #ifdef CONFIG_FEATURE_CLEAN_UP
3500 fclose(input);
3501 if (cwd && cwd != unknown)
3502 free((char*)cwd);
3503 {
3504 struct variables *cur, *tmp;
3505 for(cur = top_vars; cur; cur = tmp) {
3506 tmp = cur->next;
3507 if (!cur->flg_read_only) {
3508 free(cur->name);
3509 free(cur->value);
3510 free(cur);
3511 }
3512 }
3513 }
3514 #endif
3515
3516 final_return:
3517 return(opt?opt:last_return_code);
3518 }
3519 #endif
3520
3521 static char *insert_var_value(char *inp)
3522 {
3523 return insert_var_value_sub(inp, 0);
3524 }
3525
3526 static char *insert_var_value_sub(char *inp, int tag_subst)
3527 {
3528 int res_str_len = 0;
3529 int len;
3530 int done = 0;
3531 char *p, *p1, *res_str = NULL;
3532
3533 while ((p = strchr(inp, SPECIAL_VAR_SYMBOL))) {
3534 /* check the beginning of the string for normal characters */
3535 if (p != inp) {
3536 /* copy any characters to the result string */
3537 len = p - inp;
3538 res_str = xrealloc(res_str, (res_str_len + len));
3539 strncpy((res_str + res_str_len), inp, len);
3540 res_str_len += len;
3541 }
3542 inp = ++p;
3543 /* find the ending marker */
3544 p = strchr(inp, SPECIAL_VAR_SYMBOL);
3545 *p = '\0';
3546 /* look up the value to substitute */
3547 if ((p1 = lookup_param(inp))) {
3548 if (tag_subst)
3549 len = res_str_len + strlen(p1) + 2;
3550 else
3551 len = res_str_len + strlen(p1);
3552 res_str = xrealloc(res_str, (1 + len));
3553 if (tag_subst) {
3554 /*
3555 * copy the variable value to the result
3556 * string
3557 */
3558 strcpy((res_str + res_str_len + 1), p1);
3559
3560 /*
3561 * mark the replaced text to be accepted as
3562 * is
3563 */
3564 res_str[res_str_len] = SUBSTED_VAR_SYMBOL;
3565 res_str[res_str_len + 1 + strlen(p1)] =
3566 SUBSTED_VAR_SYMBOL;
3567 } else
3568 /*
3569 * copy the variable value to the result
3570 * string
3571 */
3572 strcpy((res_str + res_str_len), p1);
3573
3574 res_str_len = len;
3575 }
3576 *p = SPECIAL_VAR_SYMBOL;
3577 inp = ++p;
3578 done = 1;
3579 }
3580 if (done) {
3581 res_str = xrealloc(res_str, (1 + res_str_len + strlen(inp)));
3582 strcpy((res_str + res_str_len), inp);
3583 while ((p = strchr(res_str, '\n'))) {
3584 *p = ' ';
3585 }
3586 }
3587 return (res_str == NULL) ? inp : res_str;
3588 }
3589
3590 static char **make_list_in(char **inp, char *name)
3591 {
3592 int len, i;
3593 int name_len = strlen(name);
3594 int n = 0;
3595 char **list;
3596 char *p1, *p2, *p3;
3597
3598 /* create list of variable values */
3599 list = xmalloc(sizeof(*list));
3600 for (i = 0; inp[i]; i++) {
3601 p3 = insert_var_value(inp[i]);
3602 p1 = p3;
3603 while (*p1) {
3604 if (*p1 == ' ') {
3605 p1++;
3606 continue;
3607 }
3608 if ((p2 = strchr(p1, ' '))) {
3609 len = p2 - p1;
3610 } else {
3611 len = strlen(p1);
3612 p2 = p1 + len;
3613 }
3614 /* we use n + 2 in realloc for list,because we add
3615 * new element and then we will add NULL element */
3616 list = xrealloc(list, sizeof(*list) * (n + 2));
3617 list[n] = xmalloc(2 + name_len + len);
3618 strcpy(list[n], name);
3619 strcat(list[n], "=");
3620 strncat(list[n], p1, len);
3621 list[n++][name_len + len + 1] = '\0';
3622 p1 = p2;
3623 }
3624 if (p3 != inp[i]) free(p3);
3625 }
3626 list[n] = NULL;
3627 return list;
3628 }
3629
3630 /*
3631 * Make new string for parser
3632 * inp - array of argument strings to flatten
3633 * nonnull - indicates argument was quoted when originally parsed
3634 */
3635 static char *make_string(char **inp, int *nonnull)
3636 {
3637 char *p;
3638 char *str = NULL;
3639 int n;
3640 int len = 2;
3641 char *noeval_str;
3642 int noeval = 0;
3643
3644 noeval_str = get_local_var("HUSH_NO_EVAL");
3645 if (noeval_str != NULL && *noeval_str != '0' && *noeval_str != '\0')
3646 noeval = 1;
3647 for (n = 0; inp[n]; n++) {
3648 p = insert_var_value_sub(inp[n], noeval);
3649 str = xrealloc(str, (len + strlen(p) + (2 * nonnull[n])));
3650 if (n) {
3651 strcat(str, " ");
3652 } else {
3653 *str = '\0';
3654 }
3655 if (nonnull[n])
3656 strcat(str, "'");
3657 strcat(str, p);
3658 if (nonnull[n])
3659 strcat(str, "'");
3660 len = strlen(str) + 3;
3661 if (p != inp[n]) free(p);
3662 }
3663 len = strlen(str);
3664 *(str + len) = '\n';
3665 *(str + len + 1) = '\0';
3666 return str;
3667 }
3668
3669 #ifdef __U_BOOT__
3670 static int do_showvar(cmd_tbl_t *cmdtp, int flag, int argc,
3671 char * const argv[])
3672 {
3673 int i, k;
3674 int rcode = 0;
3675 struct variables *cur;
3676
3677 if (argc == 1) { /* Print all env variables */
3678 for (cur = top_vars; cur; cur = cur->next) {
3679 printf ("%s=%s\n", cur->name, cur->value);
3680 if (ctrlc ()) {
3681 puts ("\n ** Abort\n");
3682 return 1;
3683 }
3684 }
3685 return 0;
3686 }
3687 for (i = 1; i < argc; ++i) { /* print single env variables */
3688 char *name = argv[i];
3689
3690 k = -1;
3691 for (cur = top_vars; cur; cur = cur->next) {
3692 if(strcmp (cur->name, name) == 0) {
3693 k = 0;
3694 printf ("%s=%s\n", cur->name, cur->value);
3695 }
3696 if (ctrlc ()) {
3697 puts ("\n ** Abort\n");
3698 return 1;
3699 }
3700 }
3701 if (k < 0) {
3702 printf ("## Error: \"%s\" not defined\n", name);
3703 rcode ++;
3704 }
3705 }
3706 return rcode;
3707 }
3708
3709 U_BOOT_CMD(
3710 showvar, CONFIG_SYS_MAXARGS, 1, do_showvar,
3711 "print local hushshell variables",
3712 "\n - print values of all hushshell variables\n"
3713 "showvar name ...\n"
3714 " - print value of hushshell variable 'name'"
3715 );
3716
3717 #endif
3718 /****************************************************************************/
3719