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