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ARM: add psci_arch_init() declaration for CONFIG_ARMV7_PSCI
[thirdparty/u-boot.git] / common / cli_hush.c
1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * sh.c -- a prototype Bourne shell grammar parser
4 * Intended to follow the original Thompson and Ritchie
5 * "small and simple is beautiful" philosophy, which
6 * incidentally is a good match to today's BusyBox.
7 *
8 * Copyright (C) 2000,2001 Larry Doolittle <larry@doolittle.boa.org>
9 *
10 * Credits:
11 * The parser routines proper are all original material, first
12 * written Dec 2000 and Jan 2001 by Larry Doolittle.
13 * The execution engine, the builtins, and much of the underlying
14 * support has been adapted from busybox-0.49pre's lash,
15 * which is Copyright (C) 2000 by Lineo, Inc., and
16 * written by Erik Andersen <andersen@lineo.com>, <andersee@debian.org>.
17 * That, in turn, is based in part on ladsh.c, by Michael K. Johnson and
18 * Erik W. Troan, which they placed in the public domain. I don't know
19 * how much of the Johnson/Troan code has survived the repeated rewrites.
20 * Other credits:
21 * b_addchr() derived from similar w_addchar function in glibc-2.2
22 * setup_redirect(), redirect_opt_num(), and big chunks of main()
23 * and many builtins derived from contributions by Erik Andersen
24 * miscellaneous bugfixes from Matt Kraai
25 *
26 * There are two big (and related) architecture differences between
27 * this parser and the lash parser. One is that this version is
28 * actually designed from the ground up to understand nearly all
29 * of the Bourne grammar. The second, consequential change is that
30 * the parser and input reader have been turned inside out. Now,
31 * the parser is in control, and asks for input as needed. The old
32 * way had the input reader in control, and it asked for parsing to
33 * take place as needed. The new way makes it much easier to properly
34 * handle the recursion implicit in the various substitutions, especially
35 * across continuation lines.
36 *
37 * Bash grammar not implemented: (how many of these were in original sh?)
38 * $@ (those sure look like weird quoting rules)
39 * $_
40 * ! negation operator for pipes
41 * &> and >& redirection of stdout+stderr
42 * Brace Expansion
43 * Tilde Expansion
44 * fancy forms of Parameter Expansion
45 * aliases
46 * Arithmetic Expansion
47 * <(list) and >(list) Process Substitution
48 * reserved words: case, esac, select, function
49 * Here Documents ( << word )
50 * Functions
51 * Major bugs:
52 * job handling woefully incomplete and buggy
53 * reserved word execution woefully incomplete and buggy
54 * to-do:
55 * port selected bugfixes from post-0.49 busybox lash - done?
56 * finish implementing reserved words: for, while, until, do, done
57 * change { and } from special chars to reserved words
58 * builtins: break, continue, eval, return, set, trap, ulimit
59 * test magic exec
60 * handle children going into background
61 * clean up recognition of null pipes
62 * check setting of global_argc and global_argv
63 * control-C handling, probably with longjmp
64 * follow IFS rules more precisely, including update semantics
65 * figure out what to do with backslash-newline
66 * explain why we use signal instead of sigaction
67 * propagate syntax errors, die on resource errors?
68 * continuation lines, both explicit and implicit - done?
69 * memory leak finding and plugging - done?
70 * more testing, especially quoting rules and redirection
71 * document how quoting rules not precisely followed for variable assignments
72 * maybe change map[] to use 2-bit entries
73 * (eventually) remove all the printf's
74 */
75
76 #define __U_BOOT__
77 #ifdef __U_BOOT__
78 #include <common.h> /* readline */
79 #include <env.h>
80 #include <malloc.h> /* malloc, free, realloc*/
81 #include <linux/ctype.h> /* isalpha, isdigit */
82 #include <console.h>
83 #include <bootretry.h>
84 #include <cli.h>
85 #include <cli_hush.h>
86 #include <command.h> /* find_cmd */
87 #ifndef CONFIG_SYS_PROMPT_HUSH_PS2
88 #define CONFIG_SYS_PROMPT_HUSH_PS2 "> "
89 #endif
90 #endif
91 #ifndef __U_BOOT__
92 #include <ctype.h> /* isalpha, isdigit */
93 #include <unistd.h> /* getpid */
94 #include <stdlib.h> /* getenv, atoi */
95 #include <string.h> /* strchr */
96 #include <stdio.h> /* popen etc. */
97 #include <glob.h> /* glob, of course */
98 #include <stdarg.h> /* va_list */
99 #include <errno.h>
100 #include <fcntl.h>
101 #include <getopt.h> /* should be pretty obvious */
102
103 #include <sys/stat.h> /* ulimit */
104 #include <sys/types.h>
105 #include <sys/wait.h>
106 #include <signal.h>
107
108 /* #include <dmalloc.h> */
109
110 #if 1
111 #include "busybox.h"
112 #include "cmdedit.h"
113 #else
114 #define applet_name "hush"
115 #include "standalone.h"
116 #define hush_main main
117 #undef CONFIG_FEATURE_SH_FANCY_PROMPT
118 #define BB_BANNER
119 #endif
120 #endif
121 #define SPECIAL_VAR_SYMBOL 03
122 #define SUBSTED_VAR_SYMBOL 04
123 #ifndef __U_BOOT__
124 #define FLAG_EXIT_FROM_LOOP 1
125 #define FLAG_PARSE_SEMICOLON (1 << 1) /* symbol ';' is special for parser */
126 #define FLAG_REPARSING (1 << 2) /* >= 2nd pass */
127
128 #endif
129
130 #ifdef __U_BOOT__
131 DECLARE_GLOBAL_DATA_PTR;
132
133 #define EXIT_SUCCESS 0
134 #define EOF -1
135 #define syntax() syntax_err()
136 #define xstrdup strdup
137 #define error_msg printf
138 #else
139 typedef enum {
140 REDIRECT_INPUT = 1,
141 REDIRECT_OVERWRITE = 2,
142 REDIRECT_APPEND = 3,
143 REDIRECT_HEREIS = 4,
144 REDIRECT_IO = 5
145 } redir_type;
146
147 /* The descrip member of this structure is only used to make debugging
148 * output pretty */
149 struct {int mode; int default_fd; char *descrip;} redir_table[] = {
150 { 0, 0, "()" },
151 { O_RDONLY, 0, "<" },
152 { O_CREAT|O_TRUNC|O_WRONLY, 1, ">" },
153 { O_CREAT|O_APPEND|O_WRONLY, 1, ">>" },
154 { O_RDONLY, -1, "<<" },
155 { O_RDWR, 1, "<>" }
156 };
157 #endif
158
159 typedef enum {
160 PIPE_SEQ = 1,
161 PIPE_AND = 2,
162 PIPE_OR = 3,
163 PIPE_BG = 4,
164 } pipe_style;
165
166 /* might eventually control execution */
167 typedef enum {
168 RES_NONE = 0,
169 RES_IF = 1,
170 RES_THEN = 2,
171 RES_ELIF = 3,
172 RES_ELSE = 4,
173 RES_FI = 5,
174 RES_FOR = 6,
175 RES_WHILE = 7,
176 RES_UNTIL = 8,
177 RES_DO = 9,
178 RES_DONE = 10,
179 RES_XXXX = 11,
180 RES_IN = 12,
181 RES_SNTX = 13
182 } reserved_style;
183 #define FLAG_END (1<<RES_NONE)
184 #define FLAG_IF (1<<RES_IF)
185 #define FLAG_THEN (1<<RES_THEN)
186 #define FLAG_ELIF (1<<RES_ELIF)
187 #define FLAG_ELSE (1<<RES_ELSE)
188 #define FLAG_FI (1<<RES_FI)
189 #define FLAG_FOR (1<<RES_FOR)
190 #define FLAG_WHILE (1<<RES_WHILE)
191 #define FLAG_UNTIL (1<<RES_UNTIL)
192 #define FLAG_DO (1<<RES_DO)
193 #define FLAG_DONE (1<<RES_DONE)
194 #define FLAG_IN (1<<RES_IN)
195 #define FLAG_START (1<<RES_XXXX)
196
197 /* This holds pointers to the various results of parsing */
198 struct p_context {
199 struct child_prog *child;
200 struct pipe *list_head;
201 struct pipe *pipe;
202 #ifndef __U_BOOT__
203 struct redir_struct *pending_redirect;
204 #endif
205 reserved_style w;
206 int old_flag; /* for figuring out valid reserved words */
207 struct p_context *stack;
208 int type; /* define type of parser : ";$" common or special symbol */
209 /* How about quoting status? */
210 };
211
212 #ifndef __U_BOOT__
213 struct redir_struct {
214 redir_type type; /* type of redirection */
215 int fd; /* file descriptor being redirected */
216 int dup; /* -1, or file descriptor being duplicated */
217 struct redir_struct *next; /* pointer to the next redirect in the list */
218 glob_t word; /* *word.gl_pathv is the filename */
219 };
220 #endif
221
222 struct child_prog {
223 #ifndef __U_BOOT__
224 pid_t pid; /* 0 if exited */
225 #endif
226 char **argv; /* program name and arguments */
227 /* was quoted when parsed; copy of struct o_string.nonnull field */
228 int *argv_nonnull;
229 #ifdef __U_BOOT__
230 int argc; /* number of program arguments */
231 #endif
232 struct pipe *group; /* if non-NULL, first in group or subshell */
233 #ifndef __U_BOOT__
234 int subshell; /* flag, non-zero if group must be forked */
235 struct redir_struct *redirects; /* I/O redirections */
236 glob_t glob_result; /* result of parameter globbing */
237 int is_stopped; /* is the program currently running? */
238 struct pipe *family; /* pointer back to the child's parent pipe */
239 #endif
240 int sp; /* number of SPECIAL_VAR_SYMBOL */
241 int type;
242 };
243
244 struct pipe {
245 #ifndef __U_BOOT__
246 int jobid; /* job number */
247 #endif
248 int num_progs; /* total number of programs in job */
249 #ifndef __U_BOOT__
250 int running_progs; /* number of programs running */
251 char *text; /* name of job */
252 char *cmdbuf; /* buffer various argv's point into */
253 pid_t pgrp; /* process group ID for the job */
254 #endif
255 struct child_prog *progs; /* array of commands in pipe */
256 struct pipe *next; /* to track background commands */
257 #ifndef __U_BOOT__
258 int stopped_progs; /* number of programs alive, but stopped */
259 int job_context; /* bitmask defining current context */
260 #endif
261 pipe_style followup; /* PIPE_BG, PIPE_SEQ, PIPE_OR, PIPE_AND */
262 reserved_style r_mode; /* supports if, for, while, until */
263 };
264
265 #ifndef __U_BOOT__
266 struct close_me {
267 int fd;
268 struct close_me *next;
269 };
270 #endif
271
272 struct variables {
273 char *name;
274 char *value;
275 int flg_export;
276 int flg_read_only;
277 struct variables *next;
278 };
279
280 /* globals, connect us to the outside world
281 * the first three support $?, $#, and $1 */
282 #ifndef __U_BOOT__
283 char **global_argv;
284 unsigned int global_argc;
285 #endif
286 static unsigned int last_return_code;
287 #ifndef __U_BOOT__
288 extern char **environ; /* This is in <unistd.h>, but protected with __USE_GNU */
289 #endif
290
291 /* "globals" within this file */
292 static uchar *ifs;
293 static char map[256];
294 #ifndef __U_BOOT__
295 static int fake_mode;
296 static int interactive;
297 static struct close_me *close_me_head;
298 static const char *cwd;
299 static struct pipe *job_list;
300 static unsigned int last_bg_pid;
301 static unsigned int last_jobid;
302 static unsigned int shell_terminal;
303 static char *PS1;
304 static char *PS2;
305 struct variables shell_ver = { "HUSH_VERSION", "0.01", 1, 1, 0 };
306 struct variables *top_vars = &shell_ver;
307 #else
308 static int flag_repeat = 0;
309 static int do_repeat = 0;
310 static struct variables *top_vars = NULL ;
311 #endif /*__U_BOOT__ */
312
313 #define B_CHUNK (100)
314 #define B_NOSPAC 1
315
316 typedef struct {
317 char *data;
318 int length;
319 int maxlen;
320 int quote;
321 int nonnull;
322 } o_string;
323 #define NULL_O_STRING {NULL,0,0,0,0}
324 /* used for initialization:
325 o_string foo = NULL_O_STRING; */
326
327 /* I can almost use ordinary FILE *. Is open_memstream() universally
328 * available? Where is it documented? */
329 struct in_str {
330 const char *p;
331 #ifndef __U_BOOT__
332 char peek_buf[2];
333 #endif
334 int __promptme;
335 int promptmode;
336 #ifndef __U_BOOT__
337 FILE *file;
338 #endif
339 int (*get) (struct in_str *);
340 int (*peek) (struct in_str *);
341 };
342 #define b_getch(input) ((input)->get(input))
343 #define b_peek(input) ((input)->peek(input))
344
345 #ifndef __U_BOOT__
346 #define JOB_STATUS_FORMAT "[%d] %-22s %.40s\n"
347
348 struct built_in_command {
349 char *cmd; /* name */
350 char *descr; /* description */
351 int (*function) (struct child_prog *); /* function ptr */
352 };
353 #endif
354
355 /* define DEBUG_SHELL for debugging output (obviously ;-)) */
356 #if 0
357 #define DEBUG_SHELL
358 #endif
359
360 /* This should be in utility.c */
361 #ifdef DEBUG_SHELL
362 #ifndef __U_BOOT__
363 static void debug_printf(const char *format, ...)
364 {
365 va_list args;
366 va_start(args, format);
367 vfprintf(stderr, format, args);
368 va_end(args);
369 }
370 #else
371 #define debug_printf(fmt,args...) printf (fmt ,##args)
372 #endif
373 #else
374 static inline void debug_printf(const char *format, ...) { }
375 #endif
376 #define final_printf debug_printf
377
378 #ifdef __U_BOOT__
379 static void syntax_err(void) {
380 printf("syntax error\n");
381 }
382 #else
383 static void __syntax(char *file, int line) {
384 error_msg("syntax error %s:%d", file, line);
385 }
386 #define syntax() __syntax(__FILE__, __LINE__)
387 #endif
388
389 #ifdef __U_BOOT__
390 static void *xmalloc(size_t size);
391 static void *xrealloc(void *ptr, size_t size);
392 #else
393 /* Index of subroutines: */
394 /* function prototypes for builtins */
395 static int builtin_cd(struct child_prog *child);
396 static int builtin_env(struct child_prog *child);
397 static int builtin_eval(struct child_prog *child);
398 static int builtin_exec(struct child_prog *child);
399 static int builtin_exit(struct child_prog *child);
400 static int builtin_export(struct child_prog *child);
401 static int builtin_fg_bg(struct child_prog *child);
402 static int builtin_help(struct child_prog *child);
403 static int builtin_jobs(struct child_prog *child);
404 static int builtin_pwd(struct child_prog *child);
405 static int builtin_read(struct child_prog *child);
406 static int builtin_set(struct child_prog *child);
407 static int builtin_shift(struct child_prog *child);
408 static int builtin_source(struct child_prog *child);
409 static int builtin_umask(struct child_prog *child);
410 static int builtin_unset(struct child_prog *child);
411 static int builtin_not_written(struct child_prog *child);
412 #endif
413 /* o_string manipulation: */
414 static int b_check_space(o_string *o, int len);
415 static int b_addchr(o_string *o, int ch);
416 static void b_reset(o_string *o);
417 static int b_addqchr(o_string *o, int ch, int quote);
418 #ifndef __U_BOOT__
419 static int b_adduint(o_string *o, unsigned int i);
420 #endif
421 /* in_str manipulations: */
422 static int static_get(struct in_str *i);
423 static int static_peek(struct in_str *i);
424 static int file_get(struct in_str *i);
425 static int file_peek(struct in_str *i);
426 #ifndef __U_BOOT__
427 static void setup_file_in_str(struct in_str *i, FILE *f);
428 #else
429 static void setup_file_in_str(struct in_str *i);
430 #endif
431 static void setup_string_in_str(struct in_str *i, const char *s);
432 #ifndef __U_BOOT__
433 /* close_me manipulations: */
434 static void mark_open(int fd);
435 static void mark_closed(int fd);
436 static void close_all(void);
437 #endif
438 /* "run" the final data structures: */
439 static char *indenter(int i);
440 static int free_pipe_list(struct pipe *head, int indent);
441 static int free_pipe(struct pipe *pi, int indent);
442 /* really run the final data structures: */
443 #ifndef __U_BOOT__
444 static int setup_redirects(struct child_prog *prog, int squirrel[]);
445 #endif
446 static int run_list_real(struct pipe *pi);
447 #ifndef __U_BOOT__
448 static void pseudo_exec(struct child_prog *child) __attribute__ ((noreturn));
449 #endif
450 static int run_pipe_real(struct pipe *pi);
451 /* extended glob support: */
452 #ifndef __U_BOOT__
453 static int globhack(const char *src, int flags, glob_t *pglob);
454 static int glob_needed(const char *s);
455 static int xglob(o_string *dest, int flags, glob_t *pglob);
456 #endif
457 /* variable assignment: */
458 static int is_assignment(const char *s);
459 /* data structure manipulation: */
460 #ifndef __U_BOOT__
461 static int setup_redirect(struct p_context *ctx, int fd, redir_type style, struct in_str *input);
462 #endif
463 static void initialize_context(struct p_context *ctx);
464 static int done_word(o_string *dest, struct p_context *ctx);
465 static int done_command(struct p_context *ctx);
466 static int done_pipe(struct p_context *ctx, pipe_style type);
467 /* primary string parsing: */
468 #ifndef __U_BOOT__
469 static int redirect_dup_num(struct in_str *input);
470 static int redirect_opt_num(o_string *o);
471 static int process_command_subs(o_string *dest, struct p_context *ctx, struct in_str *input, int subst_end);
472 static int parse_group(o_string *dest, struct p_context *ctx, struct in_str *input, int ch);
473 #endif
474 static char *lookup_param(char *src);
475 static char *make_string(char **inp, int *nonnull);
476 static int handle_dollar(o_string *dest, struct p_context *ctx, struct in_str *input);
477 #ifndef __U_BOOT__
478 static int parse_string(o_string *dest, struct p_context *ctx, const char *src);
479 #endif
480 static int parse_stream(o_string *dest, struct p_context *ctx, struct in_str *input0, int end_trigger);
481 /* setup: */
482 static int parse_stream_outer(struct in_str *inp, int flag);
483 #ifndef __U_BOOT__
484 static int parse_string_outer(const char *s, int flag);
485 static int parse_file_outer(FILE *f);
486 #endif
487 #ifndef __U_BOOT__
488 /* job management: */
489 static int checkjobs(struct pipe* fg_pipe);
490 static void insert_bg_job(struct pipe *pi);
491 static void remove_bg_job(struct pipe *pi);
492 #endif
493 /* local variable support */
494 static char **make_list_in(char **inp, char *name);
495 static char *insert_var_value(char *inp);
496 static char *insert_var_value_sub(char *inp, int tag_subst);
497
498 #ifndef __U_BOOT__
499 /* Table of built-in functions. They can be forked or not, depending on
500 * context: within pipes, they fork. As simple commands, they do not.
501 * When used in non-forking context, they can change global variables
502 * in the parent shell process. If forked, of course they can not.
503 * For example, 'unset foo | whatever' will parse and run, but foo will
504 * still be set at the end. */
505 static struct built_in_command bltins[] = {
506 {"bg", "Resume a job in the background", builtin_fg_bg},
507 {"break", "Exit for, while or until loop", builtin_not_written},
508 {"cd", "Change working directory", builtin_cd},
509 {"continue", "Continue for, while or until loop", builtin_not_written},
510 {"env", "Print all environment variables", builtin_env},
511 {"eval", "Construct and run shell command", builtin_eval},
512 {"exec", "Exec command, replacing this shell with the exec'd process",
513 builtin_exec},
514 {"exit", "Exit from shell()", builtin_exit},
515 {"export", "Set environment variable", builtin_export},
516 {"fg", "Bring job into the foreground", builtin_fg_bg},
517 {"jobs", "Lists the active jobs", builtin_jobs},
518 {"pwd", "Print current directory", builtin_pwd},
519 {"read", "Input environment variable", builtin_read},
520 {"return", "Return from a function", builtin_not_written},
521 {"set", "Set/unset shell local variables", builtin_set},
522 {"shift", "Shift positional parameters", builtin_shift},
523 {"trap", "Trap signals", builtin_not_written},
524 {"ulimit","Controls resource limits", builtin_not_written},
525 {"umask","Sets file creation mask", builtin_umask},
526 {"unset", "Unset environment variable", builtin_unset},
527 {".", "Source-in and run commands in a file", builtin_source},
528 {"help", "List shell built-in commands", builtin_help},
529 {NULL, NULL, NULL}
530 };
531
532 static const char *set_cwd(void)
533 {
534 if(cwd==unknown)
535 cwd = NULL; /* xgetcwd(arg) called free(arg) */
536 cwd = xgetcwd((char *)cwd);
537 if (!cwd)
538 cwd = unknown;
539 return cwd;
540 }
541
542 /* built-in 'eval' handler */
543 static int builtin_eval(struct child_prog *child)
544 {
545 char *str = NULL;
546 int rcode = EXIT_SUCCESS;
547
548 if (child->argv[1]) {
549 str = make_string(child->argv + 1);
550 parse_string_outer(str, FLAG_EXIT_FROM_LOOP |
551 FLAG_PARSE_SEMICOLON);
552 free(str);
553 rcode = last_return_code;
554 }
555 return rcode;
556 }
557
558 /* built-in 'cd <path>' handler */
559 static int builtin_cd(struct child_prog *child)
560 {
561 char *newdir;
562 if (child->argv[1] == NULL)
563 newdir = env_get("HOME");
564 else
565 newdir = child->argv[1];
566 if (chdir(newdir)) {
567 printf("cd: %s: %s\n", newdir, strerror(errno));
568 return EXIT_FAILURE;
569 }
570 set_cwd();
571 return EXIT_SUCCESS;
572 }
573
574 /* built-in 'env' handler */
575 static int builtin_env(struct child_prog *dummy)
576 {
577 char **e = environ;
578 if (e == NULL) return EXIT_FAILURE;
579 for (; *e; e++) {
580 puts(*e);
581 }
582 return EXIT_SUCCESS;
583 }
584
585 /* built-in 'exec' handler */
586 static int builtin_exec(struct child_prog *child)
587 {
588 if (child->argv[1] == NULL)
589 return EXIT_SUCCESS; /* Really? */
590 child->argv++;
591 pseudo_exec(child);
592 /* never returns */
593 }
594
595 /* built-in 'exit' handler */
596 static int builtin_exit(struct child_prog *child)
597 {
598 if (child->argv[1] == NULL)
599 exit(last_return_code);
600 exit (atoi(child->argv[1]));
601 }
602
603 /* built-in 'export VAR=value' handler */
604 static int builtin_export(struct child_prog *child)
605 {
606 int res = 0;
607 char *name = child->argv[1];
608
609 if (name == NULL) {
610 return (builtin_env(child));
611 }
612
613 name = strdup(name);
614
615 if(name) {
616 char *value = strchr(name, '=');
617
618 if (!value) {
619 char *tmp;
620 /* They are exporting something without an =VALUE */
621
622 value = get_local_var(name);
623 if (value) {
624 size_t ln = strlen(name);
625
626 tmp = realloc(name, ln+strlen(value)+2);
627 if(tmp==NULL)
628 res = -1;
629 else {
630 sprintf(tmp+ln, "=%s", value);
631 name = tmp;
632 }
633 } else {
634 /* bash does not return an error when trying to export
635 * an undefined variable. Do likewise. */
636 res = 1;
637 }
638 }
639 }
640 if (res<0)
641 perror_msg("export");
642 else if(res==0)
643 res = set_local_var(name, 1);
644 else
645 res = 0;
646 free(name);
647 return res;
648 }
649
650 /* built-in 'fg' and 'bg' handler */
651 static int builtin_fg_bg(struct child_prog *child)
652 {
653 int i, jobnum;
654 struct pipe *pi=NULL;
655
656 if (!interactive)
657 return EXIT_FAILURE;
658 /* If they gave us no args, assume they want the last backgrounded task */
659 if (!child->argv[1]) {
660 for (pi = job_list; pi; pi = pi->next) {
661 if (pi->jobid == last_jobid) {
662 break;
663 }
664 }
665 if (!pi) {
666 error_msg("%s: no current job", child->argv[0]);
667 return EXIT_FAILURE;
668 }
669 } else {
670 if (sscanf(child->argv[1], "%%%d", &jobnum) != 1) {
671 error_msg("%s: bad argument '%s'", child->argv[0], child->argv[1]);
672 return EXIT_FAILURE;
673 }
674 for (pi = job_list; pi; pi = pi->next) {
675 if (pi->jobid == jobnum) {
676 break;
677 }
678 }
679 if (!pi) {
680 error_msg("%s: %d: no such job", child->argv[0], jobnum);
681 return EXIT_FAILURE;
682 }
683 }
684
685 if (*child->argv[0] == 'f') {
686 /* Put the job into the foreground. */
687 tcsetpgrp(shell_terminal, pi->pgrp);
688 }
689
690 /* Restart the processes in the job */
691 for (i = 0; i < pi->num_progs; i++)
692 pi->progs[i].is_stopped = 0;
693
694 if ( (i=kill(- pi->pgrp, SIGCONT)) < 0) {
695 if (i == ESRCH) {
696 remove_bg_job(pi);
697 } else {
698 perror_msg("kill (SIGCONT)");
699 }
700 }
701
702 pi->stopped_progs = 0;
703 return EXIT_SUCCESS;
704 }
705
706 /* built-in 'help' handler */
707 static int builtin_help(struct child_prog *dummy)
708 {
709 struct built_in_command *x;
710
711 printf("\nBuilt-in commands:\n");
712 printf("-------------------\n");
713 for (x = bltins; x->cmd; x++) {
714 if (x->descr==NULL)
715 continue;
716 printf("%s\t%s\n", x->cmd, x->descr);
717 }
718 printf("\n\n");
719 return EXIT_SUCCESS;
720 }
721
722 /* built-in 'jobs' handler */
723 static int builtin_jobs(struct child_prog *child)
724 {
725 struct pipe *job;
726 char *status_string;
727
728 for (job = job_list; job; job = job->next) {
729 if (job->running_progs == job->stopped_progs)
730 status_string = "Stopped";
731 else
732 status_string = "Running";
733
734 printf(JOB_STATUS_FORMAT, job->jobid, status_string, job->text);
735 }
736 return EXIT_SUCCESS;
737 }
738
739
740 /* built-in 'pwd' handler */
741 static int builtin_pwd(struct child_prog *dummy)
742 {
743 puts(set_cwd());
744 return EXIT_SUCCESS;
745 }
746
747 /* built-in 'read VAR' handler */
748 static int builtin_read(struct child_prog *child)
749 {
750 int res;
751
752 if (child->argv[1]) {
753 char string[BUFSIZ];
754 char *var = 0;
755
756 string[0] = 0; /* In case stdin has only EOF */
757 /* read string */
758 fgets(string, sizeof(string), stdin);
759 chomp(string);
760 var = malloc(strlen(child->argv[1])+strlen(string)+2);
761 if(var) {
762 sprintf(var, "%s=%s", child->argv[1], string);
763 res = set_local_var(var, 0);
764 } else
765 res = -1;
766 if (res)
767 fprintf(stderr, "read: %m\n");
768 free(var); /* So not move up to avoid breaking errno */
769 return res;
770 } else {
771 do res=getchar(); while(res!='\n' && res!=EOF);
772 return 0;
773 }
774 }
775
776 /* built-in 'set VAR=value' handler */
777 static int builtin_set(struct child_prog *child)
778 {
779 char *temp = child->argv[1];
780 struct variables *e;
781
782 if (temp == NULL)
783 for(e = top_vars; e; e=e->next)
784 printf("%s=%s\n", e->name, e->value);
785 else
786 set_local_var(temp, 0);
787
788 return EXIT_SUCCESS;
789 }
790
791
792 /* Built-in 'shift' handler */
793 static int builtin_shift(struct child_prog *child)
794 {
795 int n=1;
796 if (child->argv[1]) {
797 n=atoi(child->argv[1]);
798 }
799 if (n>=0 && n<global_argc) {
800 /* XXX This probably breaks $0 */
801 global_argc -= n;
802 global_argv += n;
803 return EXIT_SUCCESS;
804 } else {
805 return EXIT_FAILURE;
806 }
807 }
808
809 /* Built-in '.' handler (read-in and execute commands from file) */
810 static int builtin_source(struct child_prog *child)
811 {
812 FILE *input;
813 int status;
814
815 if (child->argv[1] == NULL)
816 return EXIT_FAILURE;
817
818 /* XXX search through $PATH is missing */
819 input = fopen(child->argv[1], "r");
820 if (!input) {
821 error_msg("Couldn't open file '%s'", child->argv[1]);
822 return EXIT_FAILURE;
823 }
824
825 /* Now run the file */
826 /* XXX argv and argc are broken; need to save old global_argv
827 * (pointer only is OK!) on this stack frame,
828 * set global_argv=child->argv+1, recurse, and restore. */
829 mark_open(fileno(input));
830 status = parse_file_outer(input);
831 mark_closed(fileno(input));
832 fclose(input);
833 return (status);
834 }
835
836 static int builtin_umask(struct child_prog *child)
837 {
838 mode_t new_umask;
839 const char *arg = child->argv[1];
840 char *end;
841 if (arg) {
842 new_umask=strtoul(arg, &end, 8);
843 if (*end!='\0' || end == arg) {
844 return EXIT_FAILURE;
845 }
846 } else {
847 printf("%.3o\n", (unsigned int) (new_umask=umask(0)));
848 }
849 umask(new_umask);
850 return EXIT_SUCCESS;
851 }
852
853 /* built-in 'unset VAR' handler */
854 static int builtin_unset(struct child_prog *child)
855 {
856 /* bash returned already true */
857 unset_local_var(child->argv[1]);
858 return EXIT_SUCCESS;
859 }
860
861 static int builtin_not_written(struct child_prog *child)
862 {
863 printf("builtin_%s not written\n",child->argv[0]);
864 return EXIT_FAILURE;
865 }
866 #endif
867
868 static int b_check_space(o_string *o, int len)
869 {
870 /* It would be easy to drop a more restrictive policy
871 * in here, such as setting a maximum string length */
872 if (o->length + len > o->maxlen) {
873 char *old_data = o->data;
874 /* assert (data == NULL || o->maxlen != 0); */
875 o->maxlen += max(2*len, B_CHUNK);
876 o->data = realloc(o->data, 1 + o->maxlen);
877 if (o->data == NULL) {
878 free(old_data);
879 }
880 }
881 return o->data == NULL;
882 }
883
884 static int b_addchr(o_string *o, int ch)
885 {
886 debug_printf("b_addchr: %c %d %p\n", ch, o->length, o);
887 if (b_check_space(o, 1)) return B_NOSPAC;
888 o->data[o->length] = ch;
889 o->length++;
890 o->data[o->length] = '\0';
891 return 0;
892 }
893
894 static void b_reset(o_string *o)
895 {
896 o->length = 0;
897 o->nonnull = 0;
898 if (o->data != NULL) *o->data = '\0';
899 }
900
901 static void b_free(o_string *o)
902 {
903 b_reset(o);
904 free(o->data);
905 o->data = NULL;
906 o->maxlen = 0;
907 }
908
909 /* My analysis of quoting semantics tells me that state information
910 * is associated with a destination, not a source.
911 */
912 static int b_addqchr(o_string *o, int ch, int quote)
913 {
914 if (quote && strchr("*?[\\",ch)) {
915 int rc;
916 rc = b_addchr(o, '\\');
917 if (rc) return rc;
918 }
919 return b_addchr(o, ch);
920 }
921
922 #ifndef __U_BOOT__
923 static int b_adduint(o_string *o, unsigned int i)
924 {
925 int r;
926 char *p = simple_itoa(i);
927 /* no escape checking necessary */
928 do r=b_addchr(o, *p++); while (r==0 && *p);
929 return r;
930 }
931 #endif
932
933 static int static_get(struct in_str *i)
934 {
935 int ch = *i->p++;
936 if (ch=='\0') return EOF;
937 return ch;
938 }
939
940 static int static_peek(struct in_str *i)
941 {
942 return *i->p;
943 }
944
945 #ifndef __U_BOOT__
946 static inline void cmdedit_set_initial_prompt(void)
947 {
948 #ifndef CONFIG_FEATURE_SH_FANCY_PROMPT
949 PS1 = NULL;
950 #else
951 PS1 = env_get("PS1");
952 if(PS1==0)
953 PS1 = "\\w \\$ ";
954 #endif
955 }
956
957 static inline void setup_prompt_string(int promptmode, char **prompt_str)
958 {
959 debug_printf("setup_prompt_string %d ",promptmode);
960 #ifndef CONFIG_FEATURE_SH_FANCY_PROMPT
961 /* Set up the prompt */
962 if (promptmode == 1) {
963 free(PS1);
964 PS1=xmalloc(strlen(cwd)+4);
965 sprintf(PS1, "%s %s", cwd, ( geteuid() != 0 ) ? "$ ":"# ");
966 *prompt_str = PS1;
967 } else {
968 *prompt_str = PS2;
969 }
970 #else
971 *prompt_str = (promptmode==1)? PS1 : PS2;
972 #endif
973 debug_printf("result %s\n",*prompt_str);
974 }
975 #endif
976
977 #ifdef __U_BOOT__
978 static int uboot_cli_readline(struct in_str *i)
979 {
980 char *prompt;
981 char __maybe_unused *ps_prompt = NULL;
982
983 if (i->promptmode == 1)
984 prompt = CONFIG_SYS_PROMPT;
985 else
986 prompt = CONFIG_SYS_PROMPT_HUSH_PS2;
987
988 #ifdef CONFIG_CMDLINE_PS_SUPPORT
989 if (i->promptmode == 1)
990 ps_prompt = env_get("PS1");
991 else
992 ps_prompt = env_get("PS2");
993 if (ps_prompt)
994 prompt = ps_prompt;
995 #endif
996
997 return cli_readline(prompt);
998 }
999 #endif
1000
1001 static void get_user_input(struct in_str *i)
1002 {
1003 #ifndef __U_BOOT__
1004 char *prompt_str;
1005 static char the_command[BUFSIZ];
1006
1007 setup_prompt_string(i->promptmode, &prompt_str);
1008 #ifdef CONFIG_FEATURE_COMMAND_EDITING
1009 /*
1010 ** enable command line editing only while a command line
1011 ** is actually being read; otherwise, we'll end up bequeathing
1012 ** atexit() handlers and other unwanted stuff to our
1013 ** child processes (rob@sysgo.de)
1014 */
1015 cmdedit_read_input(prompt_str, the_command);
1016 #else
1017 fputs(prompt_str, stdout);
1018 fflush(stdout);
1019 the_command[0]=fgetc(i->file);
1020 the_command[1]='\0';
1021 #endif
1022 fflush(stdout);
1023 i->p = the_command;
1024 #else
1025 int n;
1026 static char the_command[CONFIG_SYS_CBSIZE + 1];
1027
1028 bootretry_reset_cmd_timeout();
1029 i->__promptme = 1;
1030 n = uboot_cli_readline(i);
1031
1032 #ifdef CONFIG_BOOT_RETRY_TIME
1033 if (n == -2) {
1034 puts("\nTimeout waiting for command\n");
1035 # ifdef CONFIG_RESET_TO_RETRY
1036 do_reset(NULL, 0, 0, NULL);
1037 # else
1038 # error "This currently only works with CONFIG_RESET_TO_RETRY enabled"
1039 # endif
1040 }
1041 #endif
1042 if (n == -1 ) {
1043 flag_repeat = 0;
1044 i->__promptme = 0;
1045 }
1046 n = strlen(console_buffer);
1047 console_buffer[n] = '\n';
1048 console_buffer[n+1]= '\0';
1049 if (had_ctrlc()) flag_repeat = 0;
1050 clear_ctrlc();
1051 do_repeat = 0;
1052 if (i->promptmode == 1) {
1053 if (console_buffer[0] == '\n'&& flag_repeat == 0) {
1054 strcpy(the_command,console_buffer);
1055 }
1056 else {
1057 if (console_buffer[0] != '\n') {
1058 strcpy(the_command,console_buffer);
1059 flag_repeat = 1;
1060 }
1061 else {
1062 do_repeat = 1;
1063 }
1064 }
1065 i->p = the_command;
1066 }
1067 else {
1068 if (console_buffer[0] != '\n') {
1069 if (strlen(the_command) + strlen(console_buffer)
1070 < CONFIG_SYS_CBSIZE) {
1071 n = strlen(the_command);
1072 the_command[n-1] = ' ';
1073 strcpy(&the_command[n],console_buffer);
1074 }
1075 else {
1076 the_command[0] = '\n';
1077 the_command[1] = '\0';
1078 flag_repeat = 0;
1079 }
1080 }
1081 if (i->__promptme == 0) {
1082 the_command[0] = '\n';
1083 the_command[1] = '\0';
1084 }
1085 i->p = console_buffer;
1086 }
1087 #endif
1088 }
1089
1090 /* This is the magic location that prints prompts
1091 * and gets data back from the user */
1092 static int file_get(struct in_str *i)
1093 {
1094 int ch;
1095
1096 ch = 0;
1097 /* If there is data waiting, eat it up */
1098 if (i->p && *i->p) {
1099 ch = *i->p++;
1100 } else {
1101 /* need to double check i->file because we might be doing something
1102 * more complicated by now, like sourcing or substituting. */
1103 #ifndef __U_BOOT__
1104 if (i->__promptme && interactive && i->file == stdin) {
1105 while(! i->p || (interactive && strlen(i->p)==0) ) {
1106 #else
1107 while(! i->p || strlen(i->p)==0 ) {
1108 #endif
1109 get_user_input(i);
1110 }
1111 i->promptmode=2;
1112 #ifndef __U_BOOT__
1113 i->__promptme = 0;
1114 #endif
1115 if (i->p && *i->p) {
1116 ch = *i->p++;
1117 }
1118 #ifndef __U_BOOT__
1119 } else {
1120 ch = fgetc(i->file);
1121 }
1122
1123 #endif
1124 debug_printf("b_getch: got a %d\n", ch);
1125 }
1126 #ifndef __U_BOOT__
1127 if (ch == '\n') i->__promptme=1;
1128 #endif
1129 return ch;
1130 }
1131
1132 /* All the callers guarantee this routine will never be
1133 * used right after a newline, so prompting is not needed.
1134 */
1135 static int file_peek(struct in_str *i)
1136 {
1137 #ifndef __U_BOOT__
1138 if (i->p && *i->p) {
1139 #endif
1140 return *i->p;
1141 #ifndef __U_BOOT__
1142 } else {
1143 i->peek_buf[0] = fgetc(i->file);
1144 i->peek_buf[1] = '\0';
1145 i->p = i->peek_buf;
1146 debug_printf("b_peek: got a %d\n", *i->p);
1147 return *i->p;
1148 }
1149 #endif
1150 }
1151
1152 #ifndef __U_BOOT__
1153 static void setup_file_in_str(struct in_str *i, FILE *f)
1154 #else
1155 static void setup_file_in_str(struct in_str *i)
1156 #endif
1157 {
1158 i->peek = file_peek;
1159 i->get = file_get;
1160 i->__promptme=1;
1161 i->promptmode=1;
1162 #ifndef __U_BOOT__
1163 i->file = f;
1164 #endif
1165 i->p = NULL;
1166 }
1167
1168 static void setup_string_in_str(struct in_str *i, const char *s)
1169 {
1170 i->peek = static_peek;
1171 i->get = static_get;
1172 i->__promptme=1;
1173 i->promptmode=1;
1174 i->p = s;
1175 }
1176
1177 #ifndef __U_BOOT__
1178 static void mark_open(int fd)
1179 {
1180 struct close_me *new = xmalloc(sizeof(struct close_me));
1181 new->fd = fd;
1182 new->next = close_me_head;
1183 close_me_head = new;
1184 }
1185
1186 static void mark_closed(int fd)
1187 {
1188 struct close_me *tmp;
1189 if (close_me_head == NULL || close_me_head->fd != fd)
1190 error_msg_and_die("corrupt close_me");
1191 tmp = close_me_head;
1192 close_me_head = close_me_head->next;
1193 free(tmp);
1194 }
1195
1196 static void close_all(void)
1197 {
1198 struct close_me *c;
1199 for (c=close_me_head; c; c=c->next) {
1200 close(c->fd);
1201 }
1202 close_me_head = NULL;
1203 }
1204
1205 /* squirrel != NULL means we squirrel away copies of stdin, stdout,
1206 * and stderr if they are redirected. */
1207 static int setup_redirects(struct child_prog *prog, int squirrel[])
1208 {
1209 int openfd, mode;
1210 struct redir_struct *redir;
1211
1212 for (redir=prog->redirects; redir; redir=redir->next) {
1213 if (redir->dup == -1 && redir->word.gl_pathv == NULL) {
1214 /* something went wrong in the parse. Pretend it didn't happen */
1215 continue;
1216 }
1217 if (redir->dup == -1) {
1218 mode=redir_table[redir->type].mode;
1219 openfd = open(redir->word.gl_pathv[0], mode, 0666);
1220 if (openfd < 0) {
1221 /* this could get lost if stderr has been redirected, but
1222 bash and ash both lose it as well (though zsh doesn't!) */
1223 perror_msg("error opening %s", redir->word.gl_pathv[0]);
1224 return 1;
1225 }
1226 } else {
1227 openfd = redir->dup;
1228 }
1229
1230 if (openfd != redir->fd) {
1231 if (squirrel && redir->fd < 3) {
1232 squirrel[redir->fd] = dup(redir->fd);
1233 }
1234 if (openfd == -3) {
1235 close(openfd);
1236 } else {
1237 dup2(openfd, redir->fd);
1238 if (redir->dup == -1)
1239 close (openfd);
1240 }
1241 }
1242 }
1243 return 0;
1244 }
1245
1246 static void restore_redirects(int squirrel[])
1247 {
1248 int i, fd;
1249 for (i=0; i<3; i++) {
1250 fd = squirrel[i];
1251 if (fd != -1) {
1252 /* No error checking. I sure wouldn't know what
1253 * to do with an error if I found one! */
1254 dup2(fd, i);
1255 close(fd);
1256 }
1257 }
1258 }
1259
1260 /* never returns */
1261 /* XXX no exit() here. If you don't exec, use _exit instead.
1262 * The at_exit handlers apparently confuse the calling process,
1263 * in particular stdin handling. Not sure why? */
1264 static void pseudo_exec(struct child_prog *child)
1265 {
1266 int i, rcode;
1267 char *p;
1268 struct built_in_command *x;
1269 if (child->argv) {
1270 for (i=0; is_assignment(child->argv[i]); i++) {
1271 debug_printf("pid %d environment modification: %s\n",getpid(),child->argv[i]);
1272 p = insert_var_value(child->argv[i]);
1273 putenv(strdup(p));
1274 if (p != child->argv[i]) free(p);
1275 }
1276 child->argv+=i; /* XXX this hack isn't so horrible, since we are about
1277 to exit, and therefore don't need to keep data
1278 structures consistent for free() use. */
1279 /* If a variable is assigned in a forest, and nobody listens,
1280 * was it ever really set?
1281 */
1282 if (child->argv[0] == NULL) {
1283 _exit(EXIT_SUCCESS);
1284 }
1285
1286 /*
1287 * Check if the command matches any of the builtins.
1288 * Depending on context, this might be redundant. But it's
1289 * easier to waste a few CPU cycles than it is to figure out
1290 * if this is one of those cases.
1291 */
1292 for (x = bltins; x->cmd; x++) {
1293 if (strcmp(child->argv[0], x->cmd) == 0 ) {
1294 debug_printf("builtin exec %s\n", child->argv[0]);
1295 rcode = x->function(child);
1296 fflush(stdout);
1297 _exit(rcode);
1298 }
1299 }
1300
1301 /* Check if the command matches any busybox internal commands
1302 * ("applets") here.
1303 * FIXME: This feature is not 100% safe, since
1304 * BusyBox is not fully reentrant, so we have no guarantee the things
1305 * from the .bss are still zeroed, or that things from .data are still
1306 * at their defaults. We could exec ourself from /proc/self/exe, but I
1307 * really dislike relying on /proc for things. We could exec ourself
1308 * from global_argv[0], but if we are in a chroot, we may not be able
1309 * to find ourself... */
1310 #ifdef CONFIG_FEATURE_SH_STANDALONE_SHELL
1311 {
1312 int argc_l;
1313 char** argv_l=child->argv;
1314 char *name = child->argv[0];
1315
1316 #ifdef CONFIG_FEATURE_SH_APPLETS_ALWAYS_WIN
1317 /* Following discussions from November 2000 on the busybox mailing
1318 * list, the default configuration, (without
1319 * get_last_path_component()) lets the user force use of an
1320 * external command by specifying the full (with slashes) filename.
1321 * If you enable CONFIG_FEATURE_SH_APPLETS_ALWAYS_WIN then applets
1322 * _aways_ override external commands, so if you want to run
1323 * /bin/cat, it will use BusyBox cat even if /bin/cat exists on the
1324 * filesystem and is _not_ busybox. Some systems may want this,
1325 * most do not. */
1326 name = get_last_path_component(name);
1327 #endif
1328 /* Count argc for use in a second... */
1329 for(argc_l=0;*argv_l!=NULL; argv_l++, argc_l++);
1330 optind = 1;
1331 debug_printf("running applet %s\n", name);
1332 run_applet_by_name(name, argc_l, child->argv);
1333 }
1334 #endif
1335 debug_printf("exec of %s\n",child->argv[0]);
1336 execvp(child->argv[0],child->argv);
1337 perror_msg("couldn't exec: %s",child->argv[0]);
1338 _exit(1);
1339 } else if (child->group) {
1340 debug_printf("runtime nesting to group\n");
1341 interactive=0; /* crucial!!!! */
1342 rcode = run_list_real(child->group);
1343 /* OK to leak memory by not calling free_pipe_list,
1344 * since this process is about to exit */
1345 _exit(rcode);
1346 } else {
1347 /* Can happen. See what bash does with ">foo" by itself. */
1348 debug_printf("trying to pseudo_exec null command\n");
1349 _exit(EXIT_SUCCESS);
1350 }
1351 }
1352
1353 static void insert_bg_job(struct pipe *pi)
1354 {
1355 struct pipe *thejob;
1356
1357 /* Linear search for the ID of the job to use */
1358 pi->jobid = 1;
1359 for (thejob = job_list; thejob; thejob = thejob->next)
1360 if (thejob->jobid >= pi->jobid)
1361 pi->jobid = thejob->jobid + 1;
1362
1363 /* add thejob to the list of running jobs */
1364 if (!job_list) {
1365 thejob = job_list = xmalloc(sizeof(*thejob));
1366 } else {
1367 for (thejob = job_list; thejob->next; thejob = thejob->next) /* nothing */;
1368 thejob->next = xmalloc(sizeof(*thejob));
1369 thejob = thejob->next;
1370 }
1371
1372 /* physically copy the struct job */
1373 memcpy(thejob, pi, sizeof(struct pipe));
1374 thejob->next = NULL;
1375 thejob->running_progs = thejob->num_progs;
1376 thejob->stopped_progs = 0;
1377 thejob->text = xmalloc(BUFSIZ); /* cmdedit buffer size */
1378
1379 /*if (pi->progs[0] && pi->progs[0].argv && pi->progs[0].argv[0]) */
1380 {
1381 char *bar=thejob->text;
1382 char **foo=pi->progs[0].argv;
1383 while(foo && *foo) {
1384 bar += sprintf(bar, "%s ", *foo++);
1385 }
1386 }
1387
1388 /* we don't wait for background thejobs to return -- append it
1389 to the list of backgrounded thejobs and leave it alone */
1390 printf("[%d] %d\n", thejob->jobid, thejob->progs[0].pid);
1391 last_bg_pid = thejob->progs[0].pid;
1392 last_jobid = thejob->jobid;
1393 }
1394
1395 /* remove a backgrounded job */
1396 static void remove_bg_job(struct pipe *pi)
1397 {
1398 struct pipe *prev_pipe;
1399
1400 if (pi == job_list) {
1401 job_list = pi->next;
1402 } else {
1403 prev_pipe = job_list;
1404 while (prev_pipe->next != pi)
1405 prev_pipe = prev_pipe->next;
1406 prev_pipe->next = pi->next;
1407 }
1408 if (job_list)
1409 last_jobid = job_list->jobid;
1410 else
1411 last_jobid = 0;
1412
1413 pi->stopped_progs = 0;
1414 free_pipe(pi, 0);
1415 free(pi);
1416 }
1417
1418 /* Checks to see if any processes have exited -- if they
1419 have, figure out why and see if a job has completed */
1420 static int checkjobs(struct pipe* fg_pipe)
1421 {
1422 int attributes;
1423 int status;
1424 int prognum = 0;
1425 struct pipe *pi;
1426 pid_t childpid;
1427
1428 attributes = WUNTRACED;
1429 if (fg_pipe==NULL) {
1430 attributes |= WNOHANG;
1431 }
1432
1433 while ((childpid = waitpid(-1, &status, attributes)) > 0) {
1434 if (fg_pipe) {
1435 int i, rcode = 0;
1436 for (i=0; i < fg_pipe->num_progs; i++) {
1437 if (fg_pipe->progs[i].pid == childpid) {
1438 if (i==fg_pipe->num_progs-1)
1439 rcode=WEXITSTATUS(status);
1440 (fg_pipe->num_progs)--;
1441 return(rcode);
1442 }
1443 }
1444 }
1445
1446 for (pi = job_list; pi; pi = pi->next) {
1447 prognum = 0;
1448 while (prognum < pi->num_progs && pi->progs[prognum].pid != childpid) {
1449 prognum++;
1450 }
1451 if (prognum < pi->num_progs)
1452 break;
1453 }
1454
1455 if(pi==NULL) {
1456 debug_printf("checkjobs: pid %d was not in our list!\n", childpid);
1457 continue;
1458 }
1459
1460 if (WIFEXITED(status) || WIFSIGNALED(status)) {
1461 /* child exited */
1462 pi->running_progs--;
1463 pi->progs[prognum].pid = 0;
1464
1465 if (!pi->running_progs) {
1466 printf(JOB_STATUS_FORMAT, pi->jobid, "Done", pi->text);
1467 remove_bg_job(pi);
1468 }
1469 } else {
1470 /* child stopped */
1471 pi->stopped_progs++;
1472 pi->progs[prognum].is_stopped = 1;
1473
1474 #if 0
1475 /* Printing this stuff is a pain, since it tends to
1476 * overwrite the prompt an inconveinient moments. So
1477 * don't do that. */
1478 if (pi->stopped_progs == pi->num_progs) {
1479 printf("\n"JOB_STATUS_FORMAT, pi->jobid, "Stopped", pi->text);
1480 }
1481 #endif
1482 }
1483 }
1484
1485 if (childpid == -1 && errno != ECHILD)
1486 perror_msg("waitpid");
1487
1488 /* move the shell to the foreground */
1489 /*if (interactive && tcsetpgrp(shell_terminal, getpgid(0))) */
1490 /* perror_msg("tcsetpgrp-2"); */
1491 return -1;
1492 }
1493
1494 /* Figure out our controlling tty, checking in order stderr,
1495 * stdin, and stdout. If check_pgrp is set, also check that
1496 * we belong to the foreground process group associated with
1497 * that tty. The value of shell_terminal is needed in order to call
1498 * tcsetpgrp(shell_terminal, ...); */
1499 void controlling_tty(int check_pgrp)
1500 {
1501 pid_t curpgrp;
1502
1503 if ((curpgrp = tcgetpgrp(shell_terminal = 2)) < 0
1504 && (curpgrp = tcgetpgrp(shell_terminal = 0)) < 0
1505 && (curpgrp = tcgetpgrp(shell_terminal = 1)) < 0)
1506 goto shell_terminal_error;
1507
1508 if (check_pgrp && curpgrp != getpgid(0))
1509 goto shell_terminal_error;
1510
1511 return;
1512
1513 shell_terminal_error:
1514 shell_terminal = -1;
1515 return;
1516 }
1517 #endif
1518
1519 /* run_pipe_real() starts all the jobs, but doesn't wait for anything
1520 * to finish. See checkjobs().
1521 *
1522 * return code is normally -1, when the caller has to wait for children
1523 * to finish to determine the exit status of the pipe. If the pipe
1524 * is a simple builtin command, however, the action is done by the
1525 * time run_pipe_real returns, and the exit code is provided as the
1526 * return value.
1527 *
1528 * The input of the pipe is always stdin, the output is always
1529 * stdout. The outpipe[] mechanism in BusyBox-0.48 lash is bogus,
1530 * because it tries to avoid running the command substitution in
1531 * subshell, when that is in fact necessary. The subshell process
1532 * now has its stdout directed to the input of the appropriate pipe,
1533 * so this routine is noticeably simpler.
1534 */
1535 static int run_pipe_real(struct pipe *pi)
1536 {
1537 int i;
1538 #ifndef __U_BOOT__
1539 int nextin, nextout;
1540 int pipefds[2]; /* pipefds[0] is for reading */
1541 struct child_prog *child;
1542 struct built_in_command *x;
1543 char *p;
1544 # if __GNUC__
1545 /* Avoid longjmp clobbering */
1546 (void) &i;
1547 (void) &nextin;
1548 (void) &nextout;
1549 (void) &child;
1550 # endif
1551 #else
1552 int nextin;
1553 int flag = do_repeat ? CMD_FLAG_REPEAT : 0;
1554 struct child_prog *child;
1555 char *p;
1556 # if __GNUC__
1557 /* Avoid longjmp clobbering */
1558 (void) &i;
1559 (void) &nextin;
1560 (void) &child;
1561 # endif
1562 #endif /* __U_BOOT__ */
1563
1564 nextin = 0;
1565 #ifndef __U_BOOT__
1566 pi->pgrp = -1;
1567 #endif
1568
1569 /* Check if this is a simple builtin (not part of a pipe).
1570 * Builtins within pipes have to fork anyway, and are handled in
1571 * pseudo_exec. "echo foo | read bar" doesn't work on bash, either.
1572 */
1573 if (pi->num_progs == 1) child = & (pi->progs[0]);
1574 #ifndef __U_BOOT__
1575 if (pi->num_progs == 1 && child->group && child->subshell == 0) {
1576 int squirrel[] = {-1, -1, -1};
1577 int rcode;
1578 debug_printf("non-subshell grouping\n");
1579 setup_redirects(child, squirrel);
1580 /* XXX could we merge code with following builtin case,
1581 * by creating a pseudo builtin that calls run_list_real? */
1582 rcode = run_list_real(child->group);
1583 restore_redirects(squirrel);
1584 #else
1585 if (pi->num_progs == 1 && child->group) {
1586 int rcode;
1587 debug_printf("non-subshell grouping\n");
1588 rcode = run_list_real(child->group);
1589 #endif
1590 return rcode;
1591 } else if (pi->num_progs == 1 && pi->progs[0].argv != NULL) {
1592 for (i=0; is_assignment(child->argv[i]); i++) { /* nothing */ }
1593 if (i!=0 && child->argv[i]==NULL) {
1594 /* assignments, but no command: set the local environment */
1595 for (i=0; child->argv[i]!=NULL; i++) {
1596
1597 /* Ok, this case is tricky. We have to decide if this is a
1598 * local variable, or an already exported variable. If it is
1599 * already exported, we have to export the new value. If it is
1600 * not exported, we need only set this as a local variable.
1601 * This junk is all to decide whether or not to export this
1602 * variable. */
1603 int export_me=0;
1604 char *name, *value;
1605 name = xstrdup(child->argv[i]);
1606 debug_printf("Local environment set: %s\n", name);
1607 value = strchr(name, '=');
1608 if (value)
1609 *value=0;
1610 #ifndef __U_BOOT__
1611 if ( get_local_var(name)) {
1612 export_me=1;
1613 }
1614 #endif
1615 free(name);
1616 p = insert_var_value(child->argv[i]);
1617 set_local_var(p, export_me);
1618 if (p != child->argv[i]) free(p);
1619 }
1620 return EXIT_SUCCESS; /* don't worry about errors in set_local_var() yet */
1621 }
1622 for (i = 0; is_assignment(child->argv[i]); i++) {
1623 p = insert_var_value(child->argv[i]);
1624 #ifndef __U_BOOT__
1625 putenv(strdup(p));
1626 #else
1627 set_local_var(p, 0);
1628 #endif
1629 if (p != child->argv[i]) {
1630 child->sp--;
1631 free(p);
1632 }
1633 }
1634 if (child->sp) {
1635 char * str = NULL;
1636
1637 str = make_string(child->argv + i,
1638 child->argv_nonnull + i);
1639 parse_string_outer(str, FLAG_EXIT_FROM_LOOP | FLAG_REPARSING);
1640 free(str);
1641 return last_return_code;
1642 }
1643 #ifndef __U_BOOT__
1644 for (x = bltins; x->cmd; x++) {
1645 if (strcmp(child->argv[i], x->cmd) == 0 ) {
1646 int squirrel[] = {-1, -1, -1};
1647 int rcode;
1648 if (x->function == builtin_exec && child->argv[i+1]==NULL) {
1649 debug_printf("magic exec\n");
1650 setup_redirects(child,NULL);
1651 return EXIT_SUCCESS;
1652 }
1653 debug_printf("builtin inline %s\n", child->argv[0]);
1654 /* XXX setup_redirects acts on file descriptors, not FILEs.
1655 * This is perfect for work that comes after exec().
1656 * Is it really safe for inline use? Experimentally,
1657 * things seem to work with glibc. */
1658 setup_redirects(child, squirrel);
1659
1660 child->argv += i; /* XXX horrible hack */
1661 rcode = x->function(child);
1662 /* XXX restore hack so free() can work right */
1663 child->argv -= i;
1664 restore_redirects(squirrel);
1665 }
1666 return rcode;
1667 }
1668 #else
1669 /* check ";", because ,example , argv consist from
1670 * "help;flinfo" must not execute
1671 */
1672 if (strchr(child->argv[i], ';')) {
1673 printf("Unknown command '%s' - try 'help' or use "
1674 "'run' command\n", child->argv[i]);
1675 return -1;
1676 }
1677 /* Process the command */
1678 return cmd_process(flag, child->argc, child->argv,
1679 &flag_repeat, NULL);
1680 #endif
1681 }
1682 #ifndef __U_BOOT__
1683
1684 for (i = 0; i < pi->num_progs; i++) {
1685 child = & (pi->progs[i]);
1686
1687 /* pipes are inserted between pairs of commands */
1688 if ((i + 1) < pi->num_progs) {
1689 if (pipe(pipefds)<0) perror_msg_and_die("pipe");
1690 nextout = pipefds[1];
1691 } else {
1692 nextout=1;
1693 pipefds[0] = -1;
1694 }
1695
1696 /* XXX test for failed fork()? */
1697 if (!(child->pid = fork())) {
1698 /* Set the handling for job control signals back to the default. */
1699 signal(SIGINT, SIG_DFL);
1700 signal(SIGQUIT, SIG_DFL);
1701 signal(SIGTERM, SIG_DFL);
1702 signal(SIGTSTP, SIG_DFL);
1703 signal(SIGTTIN, SIG_DFL);
1704 signal(SIGTTOU, SIG_DFL);
1705 signal(SIGCHLD, SIG_DFL);
1706
1707 close_all();
1708
1709 if (nextin != 0) {
1710 dup2(nextin, 0);
1711 close(nextin);
1712 }
1713 if (nextout != 1) {
1714 dup2(nextout, 1);
1715 close(nextout);
1716 }
1717 if (pipefds[0]!=-1) {
1718 close(pipefds[0]); /* opposite end of our output pipe */
1719 }
1720
1721 /* Like bash, explicit redirects override pipes,
1722 * and the pipe fd is available for dup'ing. */
1723 setup_redirects(child,NULL);
1724
1725 if (interactive && pi->followup!=PIPE_BG) {
1726 /* If we (the child) win the race, put ourselves in the process
1727 * group whose leader is the first process in this pipe. */
1728 if (pi->pgrp < 0) {
1729 pi->pgrp = getpid();
1730 }
1731 if (setpgid(0, pi->pgrp) == 0) {
1732 tcsetpgrp(2, pi->pgrp);
1733 }
1734 }
1735
1736 pseudo_exec(child);
1737 }
1738
1739
1740 /* put our child in the process group whose leader is the
1741 first process in this pipe */
1742 if (pi->pgrp < 0) {
1743 pi->pgrp = child->pid;
1744 }
1745 /* Don't check for errors. The child may be dead already,
1746 * in which case setpgid returns error code EACCES. */
1747 setpgid(child->pid, pi->pgrp);
1748
1749 if (nextin != 0)
1750 close(nextin);
1751 if (nextout != 1)
1752 close(nextout);
1753
1754 /* If there isn't another process, nextin is garbage
1755 but it doesn't matter */
1756 nextin = pipefds[0];
1757 }
1758 #endif
1759 return -1;
1760 }
1761
1762 static int run_list_real(struct pipe *pi)
1763 {
1764 char *save_name = NULL;
1765 char **list = NULL;
1766 char **save_list = NULL;
1767 struct pipe *rpipe;
1768 int flag_rep = 0;
1769 #ifndef __U_BOOT__
1770 int save_num_progs;
1771 #endif
1772 int rcode=0, flag_skip=1;
1773 int flag_restore = 0;
1774 int if_code=0, next_if_code=0; /* need double-buffer to handle elif */
1775 reserved_style rmode, skip_more_in_this_rmode=RES_XXXX;
1776 /* check syntax for "for" */
1777 for (rpipe = pi; rpipe; rpipe = rpipe->next) {
1778 if ((rpipe->r_mode == RES_IN ||
1779 rpipe->r_mode == RES_FOR) &&
1780 (rpipe->next == NULL)) {
1781 syntax();
1782 #ifdef __U_BOOT__
1783 flag_repeat = 0;
1784 #endif
1785 return 1;
1786 }
1787 if ((rpipe->r_mode == RES_IN &&
1788 (rpipe->next->r_mode == RES_IN &&
1789 rpipe->next->progs->argv != NULL))||
1790 (rpipe->r_mode == RES_FOR &&
1791 rpipe->next->r_mode != RES_IN)) {
1792 syntax();
1793 #ifdef __U_BOOT__
1794 flag_repeat = 0;
1795 #endif
1796 return 1;
1797 }
1798 }
1799 for (; pi; pi = (flag_restore != 0) ? rpipe : pi->next) {
1800 if (pi->r_mode == RES_WHILE || pi->r_mode == RES_UNTIL ||
1801 pi->r_mode == RES_FOR) {
1802 #ifdef __U_BOOT__
1803 /* check Ctrl-C */
1804 ctrlc();
1805 if ((had_ctrlc())) {
1806 return 1;
1807 }
1808 #endif
1809 flag_restore = 0;
1810 if (!rpipe) {
1811 flag_rep = 0;
1812 rpipe = pi;
1813 }
1814 }
1815 rmode = pi->r_mode;
1816 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);
1817 if (rmode == skip_more_in_this_rmode && flag_skip) {
1818 if (pi->followup == PIPE_SEQ) flag_skip=0;
1819 continue;
1820 }
1821 flag_skip = 1;
1822 skip_more_in_this_rmode = RES_XXXX;
1823 if (rmode == RES_THEN || rmode == RES_ELSE) if_code = next_if_code;
1824 if (rmode == RES_THEN && if_code) continue;
1825 if (rmode == RES_ELSE && !if_code) continue;
1826 if (rmode == RES_ELIF && !if_code) break;
1827 if (rmode == RES_FOR && pi->num_progs) {
1828 if (!list) {
1829 /* if no variable values after "in" we skip "for" */
1830 if (!pi->next->progs->argv) continue;
1831 /* create list of variable values */
1832 list = make_list_in(pi->next->progs->argv,
1833 pi->progs->argv[0]);
1834 save_list = list;
1835 save_name = pi->progs->argv[0];
1836 pi->progs->argv[0] = NULL;
1837 flag_rep = 1;
1838 }
1839 if (!(*list)) {
1840 free(pi->progs->argv[0]);
1841 free(save_list);
1842 list = NULL;
1843 flag_rep = 0;
1844 pi->progs->argv[0] = save_name;
1845 #ifndef __U_BOOT__
1846 pi->progs->glob_result.gl_pathv[0] =
1847 pi->progs->argv[0];
1848 #endif
1849 continue;
1850 } else {
1851 /* insert new value from list for variable */
1852 free(pi->progs->argv[0]);
1853 pi->progs->argv[0] = *list++;
1854 #ifndef __U_BOOT__
1855 pi->progs->glob_result.gl_pathv[0] =
1856 pi->progs->argv[0];
1857 #endif
1858 }
1859 }
1860 if (rmode == RES_IN) continue;
1861 if (rmode == RES_DO) {
1862 if (!flag_rep) continue;
1863 }
1864 if (rmode == RES_DONE) {
1865 if (flag_rep) {
1866 flag_restore = 1;
1867 } else {
1868 rpipe = NULL;
1869 }
1870 }
1871 if (pi->num_progs == 0) continue;
1872 #ifndef __U_BOOT__
1873 save_num_progs = pi->num_progs; /* save number of programs */
1874 #endif
1875 rcode = run_pipe_real(pi);
1876 debug_printf("run_pipe_real returned %d\n",rcode);
1877 #ifndef __U_BOOT__
1878 if (rcode!=-1) {
1879 /* We only ran a builtin: rcode was set by the return value
1880 * of run_pipe_real(), and we don't need to wait for anything. */
1881 } else if (pi->followup==PIPE_BG) {
1882 /* XXX check bash's behavior with nontrivial pipes */
1883 /* XXX compute jobid */
1884 /* XXX what does bash do with attempts to background builtins? */
1885 insert_bg_job(pi);
1886 rcode = EXIT_SUCCESS;
1887 } else {
1888 if (interactive) {
1889 /* move the new process group into the foreground */
1890 if (tcsetpgrp(shell_terminal, pi->pgrp) && errno != ENOTTY)
1891 perror_msg("tcsetpgrp-3");
1892 rcode = checkjobs(pi);
1893 /* move the shell to the foreground */
1894 if (tcsetpgrp(shell_terminal, getpgid(0)) && errno != ENOTTY)
1895 perror_msg("tcsetpgrp-4");
1896 } else {
1897 rcode = checkjobs(pi);
1898 }
1899 debug_printf("checkjobs returned %d\n",rcode);
1900 }
1901 last_return_code=rcode;
1902 #else
1903 if (rcode < -1) {
1904 last_return_code = -rcode - 2;
1905 return -2; /* exit */
1906 }
1907 last_return_code=(rcode == 0) ? 0 : 1;
1908 #endif
1909 #ifndef __U_BOOT__
1910 pi->num_progs = save_num_progs; /* restore number of programs */
1911 #endif
1912 if ( rmode == RES_IF || rmode == RES_ELIF )
1913 next_if_code=rcode; /* can be overwritten a number of times */
1914 if (rmode == RES_WHILE)
1915 flag_rep = !last_return_code;
1916 if (rmode == RES_UNTIL)
1917 flag_rep = last_return_code;
1918 if ( (rcode==EXIT_SUCCESS && pi->followup==PIPE_OR) ||
1919 (rcode!=EXIT_SUCCESS && pi->followup==PIPE_AND) )
1920 skip_more_in_this_rmode=rmode;
1921 #ifndef __U_BOOT__
1922 checkjobs(NULL);
1923 #endif
1924 }
1925 return rcode;
1926 }
1927
1928 /* broken, of course, but OK for testing */
1929 static char *indenter(int i)
1930 {
1931 static char blanks[]=" ";
1932 return &blanks[sizeof(blanks)-i-1];
1933 }
1934
1935 /* return code is the exit status of the pipe */
1936 static int free_pipe(struct pipe *pi, int indent)
1937 {
1938 char **p;
1939 struct child_prog *child;
1940 #ifndef __U_BOOT__
1941 struct redir_struct *r, *rnext;
1942 #endif
1943 int a, i, ret_code=0;
1944 char *ind = indenter(indent);
1945
1946 #ifndef __U_BOOT__
1947 if (pi->stopped_progs > 0)
1948 return ret_code;
1949 final_printf("%s run pipe: (pid %d)\n",ind,getpid());
1950 #endif
1951 for (i=0; i<pi->num_progs; i++) {
1952 child = &pi->progs[i];
1953 final_printf("%s command %d:\n",ind,i);
1954 if (child->argv) {
1955 for (a=0,p=child->argv; *p; a++,p++) {
1956 final_printf("%s argv[%d] = %s\n",ind,a,*p);
1957 }
1958 #ifndef __U_BOOT__
1959 globfree(&child->glob_result);
1960 #else
1961 for (a = 0; a < child->argc; a++) {
1962 free(child->argv[a]);
1963 }
1964 free(child->argv);
1965 free(child->argv_nonnull);
1966 child->argc = 0;
1967 #endif
1968 child->argv=NULL;
1969 } else if (child->group) {
1970 #ifndef __U_BOOT__
1971 final_printf("%s begin group (subshell:%d)\n",ind, child->subshell);
1972 #endif
1973 ret_code = free_pipe_list(child->group,indent+3);
1974 final_printf("%s end group\n",ind);
1975 } else {
1976 final_printf("%s (nil)\n",ind);
1977 }
1978 #ifndef __U_BOOT__
1979 for (r=child->redirects; r; r=rnext) {
1980 final_printf("%s redirect %d%s", ind, r->fd, redir_table[r->type].descrip);
1981 if (r->dup == -1) {
1982 /* guard against the case >$FOO, where foo is unset or blank */
1983 if (r->word.gl_pathv) {
1984 final_printf(" %s\n", *r->word.gl_pathv);
1985 globfree(&r->word);
1986 }
1987 } else {
1988 final_printf("&%d\n", r->dup);
1989 }
1990 rnext=r->next;
1991 free(r);
1992 }
1993 child->redirects=NULL;
1994 #endif
1995 }
1996 free(pi->progs); /* children are an array, they get freed all at once */
1997 pi->progs=NULL;
1998 return ret_code;
1999 }
2000
2001 static int free_pipe_list(struct pipe *head, int indent)
2002 {
2003 int rcode=0; /* if list has no members */
2004 struct pipe *pi, *next;
2005 char *ind = indenter(indent);
2006 for (pi=head; pi; pi=next) {
2007 final_printf("%s pipe reserved mode %d\n", ind, pi->r_mode);
2008 rcode = free_pipe(pi, indent);
2009 final_printf("%s pipe followup code %d\n", ind, pi->followup);
2010 next=pi->next;
2011 pi->next=NULL;
2012 free(pi);
2013 }
2014 return rcode;
2015 }
2016
2017 /* Select which version we will use */
2018 static int run_list(struct pipe *pi)
2019 {
2020 int rcode=0;
2021 #ifndef __U_BOOT__
2022 if (fake_mode==0) {
2023 #endif
2024 rcode = run_list_real(pi);
2025 #ifndef __U_BOOT__
2026 }
2027 #endif
2028 /* free_pipe_list has the side effect of clearing memory
2029 * In the long run that function can be merged with run_list_real,
2030 * but doing that now would hobble the debugging effort. */
2031 free_pipe_list(pi,0);
2032 return rcode;
2033 }
2034
2035 /* The API for glob is arguably broken. This routine pushes a non-matching
2036 * string into the output structure, removing non-backslashed backslashes.
2037 * If someone can prove me wrong, by performing this function within the
2038 * original glob(3) api, feel free to rewrite this routine into oblivion.
2039 * Return code (0 vs. GLOB_NOSPACE) matches glob(3).
2040 * XXX broken if the last character is '\\', check that before calling.
2041 */
2042 #ifndef __U_BOOT__
2043 static int globhack(const char *src, int flags, glob_t *pglob)
2044 {
2045 int cnt=0, pathc;
2046 const char *s;
2047 char *dest;
2048 for (cnt=1, s=src; s && *s; s++) {
2049 if (*s == '\\') s++;
2050 cnt++;
2051 }
2052 dest = malloc(cnt);
2053 if (!dest) return GLOB_NOSPACE;
2054 if (!(flags & GLOB_APPEND)) {
2055 pglob->gl_pathv=NULL;
2056 pglob->gl_pathc=0;
2057 pglob->gl_offs=0;
2058 pglob->gl_offs=0;
2059 }
2060 pathc = ++pglob->gl_pathc;
2061 pglob->gl_pathv = realloc(pglob->gl_pathv, (pathc+1)*sizeof(*pglob->gl_pathv));
2062 if (pglob->gl_pathv == NULL) return GLOB_NOSPACE;
2063 pglob->gl_pathv[pathc-1]=dest;
2064 pglob->gl_pathv[pathc]=NULL;
2065 for (s=src; s && *s; s++, dest++) {
2066 if (*s == '\\') s++;
2067 *dest = *s;
2068 }
2069 *dest='\0';
2070 return 0;
2071 }
2072
2073 /* XXX broken if the last character is '\\', check that before calling */
2074 static int glob_needed(const char *s)
2075 {
2076 for (; *s; s++) {
2077 if (*s == '\\') s++;
2078 if (strchr("*[?",*s)) return 1;
2079 }
2080 return 0;
2081 }
2082
2083 #if 0
2084 static void globprint(glob_t *pglob)
2085 {
2086 int i;
2087 debug_printf("glob_t at %p:\n", pglob);
2088 debug_printf(" gl_pathc=%d gl_pathv=%p gl_offs=%d gl_flags=%d\n",
2089 pglob->gl_pathc, pglob->gl_pathv, pglob->gl_offs, pglob->gl_flags);
2090 for (i=0; i<pglob->gl_pathc; i++)
2091 debug_printf("pglob->gl_pathv[%d] = %p = %s\n", i,
2092 pglob->gl_pathv[i], pglob->gl_pathv[i]);
2093 }
2094 #endif
2095
2096 static int xglob(o_string *dest, int flags, glob_t *pglob)
2097 {
2098 int gr;
2099
2100 /* short-circuit for null word */
2101 /* we can code this better when the debug_printf's are gone */
2102 if (dest->length == 0) {
2103 if (dest->nonnull) {
2104 /* bash man page calls this an "explicit" null */
2105 gr = globhack(dest->data, flags, pglob);
2106 debug_printf("globhack returned %d\n",gr);
2107 } else {
2108 return 0;
2109 }
2110 } else if (glob_needed(dest->data)) {
2111 gr = glob(dest->data, flags, NULL, pglob);
2112 debug_printf("glob returned %d\n",gr);
2113 if (gr == GLOB_NOMATCH) {
2114 /* quote removal, or more accurately, backslash removal */
2115 gr = globhack(dest->data, flags, pglob);
2116 debug_printf("globhack returned %d\n",gr);
2117 }
2118 } else {
2119 gr = globhack(dest->data, flags, pglob);
2120 debug_printf("globhack returned %d\n",gr);
2121 }
2122 if (gr == GLOB_NOSPACE)
2123 error_msg_and_die("out of memory during glob");
2124 if (gr != 0) { /* GLOB_ABORTED ? */
2125 error_msg("glob(3) error %d",gr);
2126 }
2127 /* globprint(glob_target); */
2128 return gr;
2129 }
2130 #endif
2131
2132 #ifdef __U_BOOT__
2133 static char *get_dollar_var(char ch);
2134 #endif
2135
2136 /* This is used to get/check local shell variables */
2137 char *get_local_var(const char *s)
2138 {
2139 struct variables *cur;
2140
2141 if (!s)
2142 return NULL;
2143
2144 #ifdef __U_BOOT__
2145 if (*s == '$')
2146 return get_dollar_var(s[1]);
2147 #endif
2148
2149 for (cur = top_vars; cur; cur=cur->next)
2150 if(strcmp(cur->name, s)==0)
2151 return cur->value;
2152 return NULL;
2153 }
2154
2155 /* This is used to set local shell variables
2156 flg_export==0 if only local (not exporting) variable
2157 flg_export==1 if "new" exporting environ
2158 flg_export>1 if current startup environ (not call putenv()) */
2159 int set_local_var(const char *s, int flg_export)
2160 {
2161 char *name, *value;
2162 int result=0;
2163 struct variables *cur;
2164
2165 #ifdef __U_BOOT__
2166 /* might be possible! */
2167 if (!isalpha(*s))
2168 return -1;
2169 #endif
2170
2171 name=strdup(s);
2172
2173 #ifdef __U_BOOT__
2174 if (env_get(name) != NULL) {
2175 printf ("ERROR: "
2176 "There is a global environment variable with the same name.\n");
2177 free(name);
2178 return -1;
2179 }
2180 #endif
2181 /* Assume when we enter this function that we are already in
2182 * NAME=VALUE format. So the first order of business is to
2183 * split 's' on the '=' into 'name' and 'value' */
2184 value = strchr(name, '=');
2185 if (value == NULL || *(value + 1) == 0) {
2186 free(name);
2187 return -1;
2188 }
2189 *value++ = 0;
2190
2191 for(cur = top_vars; cur; cur = cur->next) {
2192 if(strcmp(cur->name, name)==0)
2193 break;
2194 }
2195
2196 if(cur) {
2197 if(strcmp(cur->value, value)==0) {
2198 if(flg_export>0 && cur->flg_export==0)
2199 cur->flg_export=flg_export;
2200 else
2201 result++;
2202 } else {
2203 if(cur->flg_read_only) {
2204 error_msg("%s: readonly variable", name);
2205 result = -1;
2206 } else {
2207 if(flg_export>0 || cur->flg_export>1)
2208 cur->flg_export=1;
2209 free(cur->value);
2210
2211 cur->value = strdup(value);
2212 }
2213 }
2214 } else {
2215 cur = malloc(sizeof(struct variables));
2216 if(!cur) {
2217 result = -1;
2218 } else {
2219 cur->name = strdup(name);
2220 if (cur->name == NULL) {
2221 free(cur);
2222 result = -1;
2223 } else {
2224 struct variables *bottom = top_vars;
2225 cur->value = strdup(value);
2226 cur->next = NULL;
2227 cur->flg_export = flg_export;
2228 cur->flg_read_only = 0;
2229 while(bottom->next) bottom=bottom->next;
2230 bottom->next = cur;
2231 }
2232 }
2233 }
2234
2235 #ifndef __U_BOOT__
2236 if(result==0 && cur->flg_export==1) {
2237 *(value-1) = '=';
2238 result = putenv(name);
2239 } else {
2240 #endif
2241 free(name);
2242 #ifndef __U_BOOT__
2243 if(result>0) /* equivalent to previous set */
2244 result = 0;
2245 }
2246 #endif
2247 return result;
2248 }
2249
2250 void unset_local_var(const char *name)
2251 {
2252 struct variables *cur;
2253
2254 if (name) {
2255 for (cur = top_vars; cur; cur=cur->next) {
2256 if(strcmp(cur->name, name)==0)
2257 break;
2258 }
2259 if (cur != NULL) {
2260 struct variables *next = top_vars;
2261 if(cur->flg_read_only) {
2262 error_msg("%s: readonly variable", name);
2263 return;
2264 } else {
2265 #ifndef __U_BOOT__
2266 if(cur->flg_export)
2267 unenv_set(cur->name);
2268 #endif
2269 free(cur->name);
2270 free(cur->value);
2271 while (next->next != cur)
2272 next = next->next;
2273 next->next = cur->next;
2274 }
2275 free(cur);
2276 }
2277 }
2278 }
2279
2280 static int is_assignment(const char *s)
2281 {
2282 if (s == NULL)
2283 return 0;
2284
2285 if (!isalpha(*s)) return 0;
2286 ++s;
2287 while(isalnum(*s) || *s=='_') ++s;
2288 return *s=='=';
2289 }
2290
2291 #ifndef __U_BOOT__
2292 /* the src parameter allows us to peek forward to a possible &n syntax
2293 * for file descriptor duplication, e.g., "2>&1".
2294 * Return code is 0 normally, 1 if a syntax error is detected in src.
2295 * Resource errors (in xmalloc) cause the process to exit */
2296 static int setup_redirect(struct p_context *ctx, int fd, redir_type style,
2297 struct in_str *input)
2298 {
2299 struct child_prog *child=ctx->child;
2300 struct redir_struct *redir = child->redirects;
2301 struct redir_struct *last_redir=NULL;
2302
2303 /* Create a new redir_struct and drop it onto the end of the linked list */
2304 while(redir) {
2305 last_redir=redir;
2306 redir=redir->next;
2307 }
2308 redir = xmalloc(sizeof(struct redir_struct));
2309 redir->next=NULL;
2310 redir->word.gl_pathv=NULL;
2311 if (last_redir) {
2312 last_redir->next=redir;
2313 } else {
2314 child->redirects=redir;
2315 }
2316
2317 redir->type=style;
2318 redir->fd= (fd==-1) ? redir_table[style].default_fd : fd ;
2319
2320 debug_printf("Redirect type %d%s\n", redir->fd, redir_table[style].descrip);
2321
2322 /* Check for a '2>&1' type redirect */
2323 redir->dup = redirect_dup_num(input);
2324 if (redir->dup == -2) return 1; /* syntax error */
2325 if (redir->dup != -1) {
2326 /* Erik had a check here that the file descriptor in question
2327 * is legit; I postpone that to "run time"
2328 * A "-" representation of "close me" shows up as a -3 here */
2329 debug_printf("Duplicating redirect '%d>&%d'\n", redir->fd, redir->dup);
2330 } else {
2331 /* We do _not_ try to open the file that src points to,
2332 * since we need to return and let src be expanded first.
2333 * Set ctx->pending_redirect, so we know what to do at the
2334 * end of the next parsed word.
2335 */
2336 ctx->pending_redirect = redir;
2337 }
2338 return 0;
2339 }
2340 #endif
2341
2342 static struct pipe *new_pipe(void)
2343 {
2344 struct pipe *pi;
2345 pi = xmalloc(sizeof(struct pipe));
2346 pi->num_progs = 0;
2347 pi->progs = NULL;
2348 pi->next = NULL;
2349 pi->followup = 0; /* invalid */
2350 pi->r_mode = RES_NONE;
2351 return pi;
2352 }
2353
2354 static void initialize_context(struct p_context *ctx)
2355 {
2356 ctx->pipe=NULL;
2357 #ifndef __U_BOOT__
2358 ctx->pending_redirect=NULL;
2359 #endif
2360 ctx->child=NULL;
2361 ctx->list_head=new_pipe();
2362 ctx->pipe=ctx->list_head;
2363 ctx->w=RES_NONE;
2364 ctx->stack=NULL;
2365 #ifdef __U_BOOT__
2366 ctx->old_flag=0;
2367 #endif
2368 done_command(ctx); /* creates the memory for working child */
2369 }
2370
2371 /* normal return is 0
2372 * if a reserved word is found, and processed, return 1
2373 * should handle if, then, elif, else, fi, for, while, until, do, done.
2374 * case, function, and select are obnoxious, save those for later.
2375 */
2376 struct reserved_combo {
2377 char *literal;
2378 int code;
2379 long flag;
2380 };
2381 /* Mostly a list of accepted follow-up reserved words.
2382 * FLAG_END means we are done with the sequence, and are ready
2383 * to turn the compound list into a command.
2384 * FLAG_START means the word must start a new compound list.
2385 */
2386 static struct reserved_combo reserved_list[] = {
2387 { "if", RES_IF, FLAG_THEN | FLAG_START },
2388 { "then", RES_THEN, FLAG_ELIF | FLAG_ELSE | FLAG_FI },
2389 { "elif", RES_ELIF, FLAG_THEN },
2390 { "else", RES_ELSE, FLAG_FI },
2391 { "fi", RES_FI, FLAG_END },
2392 { "for", RES_FOR, FLAG_IN | FLAG_START },
2393 { "while", RES_WHILE, FLAG_DO | FLAG_START },
2394 { "until", RES_UNTIL, FLAG_DO | FLAG_START },
2395 { "in", RES_IN, FLAG_DO },
2396 { "do", RES_DO, FLAG_DONE },
2397 { "done", RES_DONE, FLAG_END }
2398 };
2399 #define NRES (sizeof(reserved_list)/sizeof(struct reserved_combo))
2400
2401 static int reserved_word(o_string *dest, struct p_context *ctx)
2402 {
2403 struct reserved_combo *r;
2404 for (r=reserved_list;
2405 r<reserved_list+NRES; r++) {
2406 if (strcmp(dest->data, r->literal) == 0) {
2407 debug_printf("found reserved word %s, code %d\n",r->literal,r->code);
2408 if (r->flag & FLAG_START) {
2409 struct p_context *new = xmalloc(sizeof(struct p_context));
2410 debug_printf("push stack\n");
2411 if (ctx->w == RES_IN || ctx->w == RES_FOR) {
2412 syntax();
2413 free(new);
2414 ctx->w = RES_SNTX;
2415 b_reset(dest);
2416 return 1;
2417 }
2418 *new = *ctx; /* physical copy */
2419 initialize_context(ctx);
2420 ctx->stack=new;
2421 } else if ( ctx->w == RES_NONE || ! (ctx->old_flag & (1<<r->code))) {
2422 syntax();
2423 ctx->w = RES_SNTX;
2424 b_reset(dest);
2425 return 1;
2426 }
2427 ctx->w=r->code;
2428 ctx->old_flag = r->flag;
2429 if (ctx->old_flag & FLAG_END) {
2430 struct p_context *old;
2431 debug_printf("pop stack\n");
2432 done_pipe(ctx,PIPE_SEQ);
2433 old = ctx->stack;
2434 old->child->group = ctx->list_head;
2435 #ifndef __U_BOOT__
2436 old->child->subshell = 0;
2437 #endif
2438 *ctx = *old; /* physical copy */
2439 free(old);
2440 }
2441 b_reset (dest);
2442 return 1;
2443 }
2444 }
2445 return 0;
2446 }
2447
2448 /* normal return is 0.
2449 * Syntax or xglob errors return 1. */
2450 static int done_word(o_string *dest, struct p_context *ctx)
2451 {
2452 struct child_prog *child=ctx->child;
2453 #ifndef __U_BOOT__
2454 glob_t *glob_target;
2455 int gr, flags = 0;
2456 #else
2457 char *str, *s;
2458 int argc, cnt;
2459 #endif
2460
2461 debug_printf("done_word: %s %p\n", dest->data, child);
2462 if (dest->length == 0 && !dest->nonnull) {
2463 debug_printf(" true null, ignored\n");
2464 return 0;
2465 }
2466 #ifndef __U_BOOT__
2467 if (ctx->pending_redirect) {
2468 glob_target = &ctx->pending_redirect->word;
2469 } else {
2470 #endif
2471 if (child->group) {
2472 syntax();
2473 return 1; /* syntax error, groups and arglists don't mix */
2474 }
2475 if (!child->argv && (ctx->type & FLAG_PARSE_SEMICOLON)) {
2476 debug_printf("checking %s for reserved-ness\n",dest->data);
2477 if (reserved_word(dest,ctx)) return ctx->w==RES_SNTX;
2478 }
2479 #ifndef __U_BOOT__
2480 glob_target = &child->glob_result;
2481 if (child->argv) flags |= GLOB_APPEND;
2482 #else
2483 for (cnt = 1, s = dest->data; s && *s; s++) {
2484 if (*s == '\\') s++;
2485 cnt++;
2486 }
2487 str = malloc(cnt);
2488 if (!str) return 1;
2489 if ( child->argv == NULL) {
2490 child->argc=0;
2491 }
2492 argc = ++child->argc;
2493 child->argv = realloc(child->argv, (argc+1)*sizeof(*child->argv));
2494 if (child->argv == NULL) {
2495 free(str);
2496 return 1;
2497 }
2498 child->argv_nonnull = realloc(child->argv_nonnull,
2499 (argc+1)*sizeof(*child->argv_nonnull));
2500 if (child->argv_nonnull == NULL) {
2501 free(str);
2502 return 1;
2503 }
2504 child->argv[argc-1]=str;
2505 child->argv_nonnull[argc-1] = dest->nonnull;
2506 child->argv[argc]=NULL;
2507 child->argv_nonnull[argc] = 0;
2508 for (s = dest->data; s && *s; s++,str++) {
2509 if (*s == '\\') s++;
2510 *str = *s;
2511 }
2512 *str = '\0';
2513 #endif
2514 #ifndef __U_BOOT__
2515 }
2516 gr = xglob(dest, flags, glob_target);
2517 if (gr != 0) return 1;
2518 #endif
2519
2520 b_reset(dest);
2521 #ifndef __U_BOOT__
2522 if (ctx->pending_redirect) {
2523 ctx->pending_redirect=NULL;
2524 if (glob_target->gl_pathc != 1) {
2525 error_msg("ambiguous redirect");
2526 return 1;
2527 }
2528 } else {
2529 child->argv = glob_target->gl_pathv;
2530 }
2531 #endif
2532 if (ctx->w == RES_FOR) {
2533 done_word(dest,ctx);
2534 done_pipe(ctx,PIPE_SEQ);
2535 }
2536 return 0;
2537 }
2538
2539 /* The only possible error here is out of memory, in which case
2540 * xmalloc exits. */
2541 static int done_command(struct p_context *ctx)
2542 {
2543 /* The child is really already in the pipe structure, so
2544 * advance the pipe counter and make a new, null child.
2545 * Only real trickiness here is that the uncommitted
2546 * child structure, to which ctx->child points, is not
2547 * counted in pi->num_progs. */
2548 struct pipe *pi=ctx->pipe;
2549 struct child_prog *prog=ctx->child;
2550
2551 if (prog && prog->group == NULL
2552 && prog->argv == NULL
2553 #ifndef __U_BOOT__
2554 && prog->redirects == NULL) {
2555 #else
2556 ) {
2557 #endif
2558 debug_printf("done_command: skipping null command\n");
2559 return 0;
2560 } else if (prog) {
2561 pi->num_progs++;
2562 debug_printf("done_command: num_progs incremented to %d\n",pi->num_progs);
2563 } else {
2564 debug_printf("done_command: initializing\n");
2565 }
2566 pi->progs = xrealloc(pi->progs, sizeof(*pi->progs) * (pi->num_progs+1));
2567
2568 prog = pi->progs + pi->num_progs;
2569 #ifndef __U_BOOT__
2570 prog->redirects = NULL;
2571 #endif
2572 prog->argv = NULL;
2573 prog->argv_nonnull = NULL;
2574 #ifndef __U_BOOT__
2575 prog->is_stopped = 0;
2576 #endif
2577 prog->group = NULL;
2578 #ifndef __U_BOOT__
2579 prog->glob_result.gl_pathv = NULL;
2580 prog->family = pi;
2581 #endif
2582 prog->sp = 0;
2583 ctx->child = prog;
2584 prog->type = ctx->type;
2585
2586 /* but ctx->pipe and ctx->list_head remain unchanged */
2587 return 0;
2588 }
2589
2590 static int done_pipe(struct p_context *ctx, pipe_style type)
2591 {
2592 struct pipe *new_p;
2593 done_command(ctx); /* implicit closure of previous command */
2594 debug_printf("done_pipe, type %d\n", type);
2595 ctx->pipe->followup = type;
2596 ctx->pipe->r_mode = ctx->w;
2597 new_p=new_pipe();
2598 ctx->pipe->next = new_p;
2599 ctx->pipe = new_p;
2600 ctx->child = NULL;
2601 done_command(ctx); /* set up new pipe to accept commands */
2602 return 0;
2603 }
2604
2605 #ifndef __U_BOOT__
2606 /* peek ahead in the in_str to find out if we have a "&n" construct,
2607 * as in "2>&1", that represents duplicating a file descriptor.
2608 * returns either -2 (syntax error), -1 (no &), or the number found.
2609 */
2610 static int redirect_dup_num(struct in_str *input)
2611 {
2612 int ch, d=0, ok=0;
2613 ch = b_peek(input);
2614 if (ch != '&') return -1;
2615
2616 b_getch(input); /* get the & */
2617 ch=b_peek(input);
2618 if (ch == '-') {
2619 b_getch(input);
2620 return -3; /* "-" represents "close me" */
2621 }
2622 while (isdigit(ch)) {
2623 d = d*10+(ch-'0');
2624 ok=1;
2625 b_getch(input);
2626 ch = b_peek(input);
2627 }
2628 if (ok) return d;
2629
2630 error_msg("ambiguous redirect");
2631 return -2;
2632 }
2633
2634 /* If a redirect is immediately preceded by a number, that number is
2635 * supposed to tell which file descriptor to redirect. This routine
2636 * looks for such preceding numbers. In an ideal world this routine
2637 * needs to handle all the following classes of redirects...
2638 * echo 2>foo # redirects fd 2 to file "foo", nothing passed to echo
2639 * echo 49>foo # redirects fd 49 to file "foo", nothing passed to echo
2640 * echo -2>foo # redirects fd 1 to file "foo", "-2" passed to echo
2641 * echo 49x>foo # redirects fd 1 to file "foo", "49x" passed to echo
2642 * A -1 output from this program means no valid number was found, so the
2643 * caller should use the appropriate default for this redirection.
2644 */
2645 static int redirect_opt_num(o_string *o)
2646 {
2647 int num;
2648
2649 if (o->length==0) return -1;
2650 for(num=0; num<o->length; num++) {
2651 if (!isdigit(*(o->data+num))) {
2652 return -1;
2653 }
2654 }
2655 /* reuse num (and save an int) */
2656 num=atoi(o->data);
2657 b_reset(o);
2658 return num;
2659 }
2660
2661 FILE *generate_stream_from_list(struct pipe *head)
2662 {
2663 FILE *pf;
2664 #if 1
2665 int pid, channel[2];
2666 if (pipe(channel)<0) perror_msg_and_die("pipe");
2667 pid=fork();
2668 if (pid<0) {
2669 perror_msg_and_die("fork");
2670 } else if (pid==0) {
2671 close(channel[0]);
2672 if (channel[1] != 1) {
2673 dup2(channel[1],1);
2674 close(channel[1]);
2675 }
2676 #if 0
2677 #define SURROGATE "surrogate response"
2678 write(1,SURROGATE,sizeof(SURROGATE));
2679 _exit(run_list(head));
2680 #else
2681 _exit(run_list_real(head)); /* leaks memory */
2682 #endif
2683 }
2684 debug_printf("forked child %d\n",pid);
2685 close(channel[1]);
2686 pf = fdopen(channel[0],"r");
2687 debug_printf("pipe on FILE *%p\n",pf);
2688 #else
2689 free_pipe_list(head,0);
2690 pf=popen("echo surrogate response","r");
2691 debug_printf("started fake pipe on FILE *%p\n",pf);
2692 #endif
2693 return pf;
2694 }
2695
2696 /* this version hacked for testing purposes */
2697 /* return code is exit status of the process that is run. */
2698 static int process_command_subs(o_string *dest, struct p_context *ctx, struct in_str *input, int subst_end)
2699 {
2700 int retcode;
2701 o_string result=NULL_O_STRING;
2702 struct p_context inner;
2703 FILE *p;
2704 struct in_str pipe_str;
2705 initialize_context(&inner);
2706
2707 /* recursion to generate command */
2708 retcode = parse_stream(&result, &inner, input, subst_end);
2709 if (retcode != 0) return retcode; /* syntax error or EOF */
2710 done_word(&result, &inner);
2711 done_pipe(&inner, PIPE_SEQ);
2712 b_free(&result);
2713
2714 p=generate_stream_from_list(inner.list_head);
2715 if (p==NULL) return 1;
2716 mark_open(fileno(p));
2717 setup_file_in_str(&pipe_str, p);
2718
2719 /* now send results of command back into original context */
2720 retcode = parse_stream(dest, ctx, &pipe_str, '\0');
2721 /* XXX In case of a syntax error, should we try to kill the child?
2722 * That would be tough to do right, so just read until EOF. */
2723 if (retcode == 1) {
2724 while (b_getch(&pipe_str)!=EOF) { /* discard */ };
2725 }
2726
2727 debug_printf("done reading from pipe, pclose()ing\n");
2728 /* This is the step that wait()s for the child. Should be pretty
2729 * safe, since we just read an EOF from its stdout. We could try
2730 * to better, by using wait(), and keeping track of background jobs
2731 * at the same time. That would be a lot of work, and contrary
2732 * to the KISS philosophy of this program. */
2733 mark_closed(fileno(p));
2734 retcode=pclose(p);
2735 free_pipe_list(inner.list_head,0);
2736 debug_printf("pclosed, retcode=%d\n",retcode);
2737 /* XXX this process fails to trim a single trailing newline */
2738 return retcode;
2739 }
2740
2741 static int parse_group(o_string *dest, struct p_context *ctx,
2742 struct in_str *input, int ch)
2743 {
2744 int rcode, endch=0;
2745 struct p_context sub;
2746 struct child_prog *child = ctx->child;
2747 if (child->argv) {
2748 syntax();
2749 return 1; /* syntax error, groups and arglists don't mix */
2750 }
2751 initialize_context(&sub);
2752 switch(ch) {
2753 case '(': endch=')'; child->subshell=1; break;
2754 case '{': endch='}'; break;
2755 default: syntax(); /* really logic error */
2756 }
2757 rcode=parse_stream(dest,&sub,input,endch);
2758 done_word(dest,&sub); /* finish off the final word in the subcontext */
2759 done_pipe(&sub, PIPE_SEQ); /* and the final command there, too */
2760 child->group = sub.list_head;
2761 return rcode;
2762 /* child remains "open", available for possible redirects */
2763 }
2764 #endif
2765
2766 /* basically useful version until someone wants to get fancier,
2767 * see the bash man page under "Parameter Expansion" */
2768 static char *lookup_param(char *src)
2769 {
2770 char *p;
2771 char *sep;
2772 char *default_val = NULL;
2773 int assign = 0;
2774 int expand_empty = 0;
2775
2776 if (!src)
2777 return NULL;
2778
2779 sep = strchr(src, ':');
2780
2781 if (sep) {
2782 *sep = '\0';
2783 if (*(sep + 1) == '-')
2784 default_val = sep+2;
2785 if (*(sep + 1) == '=') {
2786 default_val = sep+2;
2787 assign = 1;
2788 }
2789 if (*(sep + 1) == '+') {
2790 default_val = sep+2;
2791 expand_empty = 1;
2792 }
2793 }
2794
2795 p = env_get(src);
2796 if (!p)
2797 p = get_local_var(src);
2798
2799 if (!p || strlen(p) == 0) {
2800 p = default_val;
2801 if (assign) {
2802 char *var = malloc(strlen(src)+strlen(default_val)+2);
2803 if (var) {
2804 sprintf(var, "%s=%s", src, default_val);
2805 set_local_var(var, 0);
2806 }
2807 free(var);
2808 }
2809 } else if (expand_empty) {
2810 p += strlen(p);
2811 }
2812
2813 if (sep)
2814 *sep = ':';
2815
2816 return p;
2817 }
2818
2819 #ifdef __U_BOOT__
2820 static char *get_dollar_var(char ch)
2821 {
2822 static char buf[40];
2823
2824 buf[0] = '\0';
2825 switch (ch) {
2826 case '?':
2827 sprintf(buf, "%u", (unsigned int)last_return_code);
2828 break;
2829 default:
2830 return NULL;
2831 }
2832 return buf;
2833 }
2834 #endif
2835
2836 /* return code: 0 for OK, 1 for syntax error */
2837 static int handle_dollar(o_string *dest, struct p_context *ctx, struct in_str *input)
2838 {
2839 #ifndef __U_BOOT__
2840 int i, advance=0;
2841 #else
2842 int advance=0;
2843 #endif
2844 #ifndef __U_BOOT__
2845 char sep[]=" ";
2846 #endif
2847 int ch = input->peek(input); /* first character after the $ */
2848 debug_printf("handle_dollar: ch=%c\n",ch);
2849 if (isalpha(ch)) {
2850 b_addchr(dest, SPECIAL_VAR_SYMBOL);
2851 ctx->child->sp++;
2852 while(ch=b_peek(input),isalnum(ch) || ch=='_') {
2853 b_getch(input);
2854 b_addchr(dest,ch);
2855 }
2856 b_addchr(dest, SPECIAL_VAR_SYMBOL);
2857 #ifndef __U_BOOT__
2858 } else if (isdigit(ch)) {
2859 i = ch-'0'; /* XXX is $0 special? */
2860 if (i<global_argc) {
2861 parse_string(dest, ctx, global_argv[i]); /* recursion */
2862 }
2863 advance = 1;
2864 #endif
2865 } else switch (ch) {
2866 #ifndef __U_BOOT__
2867 case '$':
2868 b_adduint(dest,getpid());
2869 advance = 1;
2870 break;
2871 case '!':
2872 if (last_bg_pid > 0) b_adduint(dest, last_bg_pid);
2873 advance = 1;
2874 break;
2875 #endif
2876 case '?':
2877 #ifndef __U_BOOT__
2878 b_adduint(dest,last_return_code);
2879 #else
2880 ctx->child->sp++;
2881 b_addchr(dest, SPECIAL_VAR_SYMBOL);
2882 b_addchr(dest, '$');
2883 b_addchr(dest, '?');
2884 b_addchr(dest, SPECIAL_VAR_SYMBOL);
2885 #endif
2886 advance = 1;
2887 break;
2888 #ifndef __U_BOOT__
2889 case '#':
2890 b_adduint(dest,global_argc ? global_argc-1 : 0);
2891 advance = 1;
2892 break;
2893 #endif
2894 case '{':
2895 b_addchr(dest, SPECIAL_VAR_SYMBOL);
2896 ctx->child->sp++;
2897 b_getch(input);
2898 /* XXX maybe someone will try to escape the '}' */
2899 while(ch=b_getch(input),ch!=EOF && ch!='}') {
2900 b_addchr(dest,ch);
2901 }
2902 if (ch != '}') {
2903 syntax();
2904 return 1;
2905 }
2906 b_addchr(dest, SPECIAL_VAR_SYMBOL);
2907 break;
2908 #ifndef __U_BOOT__
2909 case '(':
2910 b_getch(input);
2911 process_command_subs(dest, ctx, input, ')');
2912 break;
2913 case '*':
2914 sep[0]=ifs[0];
2915 for (i=1; i<global_argc; i++) {
2916 parse_string(dest, ctx, global_argv[i]);
2917 if (i+1 < global_argc) parse_string(dest, ctx, sep);
2918 }
2919 break;
2920 case '@':
2921 case '-':
2922 case '_':
2923 /* still unhandled, but should be eventually */
2924 error_msg("unhandled syntax: $%c",ch);
2925 return 1;
2926 break;
2927 #endif
2928 default:
2929 b_addqchr(dest,'$',dest->quote);
2930 }
2931 /* Eat the character if the flag was set. If the compiler
2932 * is smart enough, we could substitute "b_getch(input);"
2933 * for all the "advance = 1;" above, and also end up with
2934 * a nice size-optimized program. Hah! That'll be the day.
2935 */
2936 if (advance) b_getch(input);
2937 return 0;
2938 }
2939
2940 #ifndef __U_BOOT__
2941 int parse_string(o_string *dest, struct p_context *ctx, const char *src)
2942 {
2943 struct in_str foo;
2944 setup_string_in_str(&foo, src);
2945 return parse_stream(dest, ctx, &foo, '\0');
2946 }
2947 #endif
2948
2949 /* return code is 0 for normal exit, 1 for syntax error */
2950 static int parse_stream(o_string *dest, struct p_context *ctx,
2951 struct in_str *input, int end_trigger)
2952 {
2953 unsigned int ch, m;
2954 #ifndef __U_BOOT__
2955 int redir_fd;
2956 redir_type redir_style;
2957 #endif
2958 int next;
2959
2960 /* Only double-quote state is handled in the state variable dest->quote.
2961 * A single-quote triggers a bypass of the main loop until its mate is
2962 * found. When recursing, quote state is passed in via dest->quote. */
2963
2964 debug_printf("parse_stream, end_trigger=%d\n",end_trigger);
2965 while ((ch=b_getch(input))!=EOF) {
2966 m = map[ch];
2967 #ifdef __U_BOOT__
2968 if (input->__promptme == 0) return 1;
2969 #endif
2970 next = (ch == '\n') ? 0 : b_peek(input);
2971
2972 debug_printf("parse_stream: ch=%c (%d) m=%d quote=%d - %c\n",
2973 ch >= ' ' ? ch : '.', ch, m,
2974 dest->quote, ctx->stack == NULL ? '*' : '.');
2975
2976 if (m==0 || ((m==1 || m==2) && dest->quote)) {
2977 b_addqchr(dest, ch, dest->quote);
2978 } else {
2979 if (m==2) { /* unquoted IFS */
2980 if (done_word(dest, ctx)) {
2981 return 1;
2982 }
2983 /* If we aren't performing a substitution, treat a newline as a
2984 * command separator. */
2985 if (end_trigger != '\0' && ch=='\n')
2986 done_pipe(ctx,PIPE_SEQ);
2987 }
2988 if (ch == end_trigger && !dest->quote && ctx->w==RES_NONE) {
2989 debug_printf("leaving parse_stream (triggered)\n");
2990 return 0;
2991 }
2992 #if 0
2993 if (ch=='\n') {
2994 /* Yahoo! Time to run with it! */
2995 done_pipe(ctx,PIPE_SEQ);
2996 run_list(ctx->list_head);
2997 initialize_context(ctx);
2998 }
2999 #endif
3000 if (m!=2) switch (ch) {
3001 case '#':
3002 if (dest->length == 0 && !dest->quote) {
3003 while(ch=b_peek(input),ch!=EOF && ch!='\n') { b_getch(input); }
3004 } else {
3005 b_addqchr(dest, ch, dest->quote);
3006 }
3007 break;
3008 case '\\':
3009 if (next == EOF) {
3010 syntax();
3011 return 1;
3012 }
3013 b_addqchr(dest, '\\', dest->quote);
3014 b_addqchr(dest, b_getch(input), dest->quote);
3015 break;
3016 case '$':
3017 if (handle_dollar(dest, ctx, input)!=0) return 1;
3018 break;
3019 case '\'':
3020 dest->nonnull = 1;
3021 while(ch=b_getch(input),ch!=EOF && ch!='\'') {
3022 #ifdef __U_BOOT__
3023 if(input->__promptme == 0) return 1;
3024 #endif
3025 b_addchr(dest,ch);
3026 }
3027 if (ch==EOF) {
3028 syntax();
3029 return 1;
3030 }
3031 break;
3032 case '"':
3033 dest->nonnull = 1;
3034 dest->quote = !dest->quote;
3035 break;
3036 #ifndef __U_BOOT__
3037 case '`':
3038 process_command_subs(dest, ctx, input, '`');
3039 break;
3040 case '>':
3041 redir_fd = redirect_opt_num(dest);
3042 done_word(dest, ctx);
3043 redir_style=REDIRECT_OVERWRITE;
3044 if (next == '>') {
3045 redir_style=REDIRECT_APPEND;
3046 b_getch(input);
3047 } else if (next == '(') {
3048 syntax(); /* until we support >(list) Process Substitution */
3049 return 1;
3050 }
3051 setup_redirect(ctx, redir_fd, redir_style, input);
3052 break;
3053 case '<':
3054 redir_fd = redirect_opt_num(dest);
3055 done_word(dest, ctx);
3056 redir_style=REDIRECT_INPUT;
3057 if (next == '<') {
3058 redir_style=REDIRECT_HEREIS;
3059 b_getch(input);
3060 } else if (next == '>') {
3061 redir_style=REDIRECT_IO;
3062 b_getch(input);
3063 } else if (next == '(') {
3064 syntax(); /* until we support <(list) Process Substitution */
3065 return 1;
3066 }
3067 setup_redirect(ctx, redir_fd, redir_style, input);
3068 break;
3069 #endif
3070 case ';':
3071 done_word(dest, ctx);
3072 done_pipe(ctx,PIPE_SEQ);
3073 break;
3074 case '&':
3075 done_word(dest, ctx);
3076 if (next=='&') {
3077 b_getch(input);
3078 done_pipe(ctx,PIPE_AND);
3079 } else {
3080 #ifndef __U_BOOT__
3081 done_pipe(ctx,PIPE_BG);
3082 #else
3083 syntax_err();
3084 return 1;
3085 #endif
3086 }
3087 break;
3088 case '|':
3089 done_word(dest, ctx);
3090 if (next=='|') {
3091 b_getch(input);
3092 done_pipe(ctx,PIPE_OR);
3093 } else {
3094 /* we could pick up a file descriptor choice here
3095 * with redirect_opt_num(), but bash doesn't do it.
3096 * "echo foo 2| cat" yields "foo 2". */
3097 #ifndef __U_BOOT__
3098 done_command(ctx);
3099 #else
3100 syntax_err();
3101 return 1;
3102 #endif
3103 }
3104 break;
3105 #ifndef __U_BOOT__
3106 case '(':
3107 case '{':
3108 if (parse_group(dest, ctx, input, ch)!=0) return 1;
3109 break;
3110 case ')':
3111 case '}':
3112 syntax(); /* Proper use of this character caught by end_trigger */
3113 return 1;
3114 break;
3115 #endif
3116 case SUBSTED_VAR_SYMBOL:
3117 dest->nonnull = 1;
3118 while (ch = b_getch(input), ch != EOF &&
3119 ch != SUBSTED_VAR_SYMBOL) {
3120 debug_printf("subst, pass=%d\n", ch);
3121 if (input->__promptme == 0)
3122 return 1;
3123 b_addchr(dest, ch);
3124 }
3125 debug_printf("subst, term=%d\n", ch);
3126 if (ch == EOF) {
3127 syntax();
3128 return 1;
3129 }
3130 break;
3131 default:
3132 syntax(); /* this is really an internal logic error */
3133 return 1;
3134 }
3135 }
3136 }
3137 /* complain if quote? No, maybe we just finished a command substitution
3138 * that was quoted. Example:
3139 * $ echo "`cat foo` plus more"
3140 * and we just got the EOF generated by the subshell that ran "cat foo"
3141 * The only real complaint is if we got an EOF when end_trigger != '\0',
3142 * that is, we were really supposed to get end_trigger, and never got
3143 * one before the EOF. Can't use the standard "syntax error" return code,
3144 * so that parse_stream_outer can distinguish the EOF and exit smoothly. */
3145 debug_printf("leaving parse_stream (EOF)\n");
3146 if (end_trigger != '\0') return -1;
3147 return 0;
3148 }
3149
3150 static void mapset(const unsigned char *set, int code)
3151 {
3152 const unsigned char *s;
3153 for (s=set; *s; s++) map[*s] = code;
3154 }
3155
3156 static void update_ifs_map(void)
3157 {
3158 /* char *ifs and char map[256] are both globals. */
3159 ifs = (uchar *)env_get("IFS");
3160 if (ifs == NULL) ifs=(uchar *)" \t\n";
3161 /* Precompute a list of 'flow through' behavior so it can be treated
3162 * quickly up front. Computation is necessary because of IFS.
3163 * Special case handling of IFS == " \t\n" is not implemented.
3164 * The map[] array only really needs two bits each, and on most machines
3165 * that would be faster because of the reduced L1 cache footprint.
3166 */
3167 memset(map,0,sizeof(map)); /* most characters flow through always */
3168 #ifndef __U_BOOT__
3169 mapset((uchar *)"\\$'\"`", 3); /* never flow through */
3170 mapset((uchar *)"<>;&|(){}#", 1); /* flow through if quoted */
3171 #else
3172 {
3173 uchar subst[2] = {SUBSTED_VAR_SYMBOL, 0};
3174 mapset(subst, 3); /* never flow through */
3175 }
3176 mapset((uchar *)"\\$'\"", 3); /* never flow through */
3177 mapset((uchar *)";&|#", 1); /* flow through if quoted */
3178 #endif
3179 mapset(ifs, 2); /* also flow through if quoted */
3180 }
3181
3182 /* most recursion does not come through here, the exeception is
3183 * from builtin_source() */
3184 static int parse_stream_outer(struct in_str *inp, int flag)
3185 {
3186
3187 struct p_context ctx;
3188 o_string temp=NULL_O_STRING;
3189 int rcode;
3190 #ifdef __U_BOOT__
3191 int code = 1;
3192 #endif
3193 do {
3194 ctx.type = flag;
3195 initialize_context(&ctx);
3196 update_ifs_map();
3197 if (!(flag & FLAG_PARSE_SEMICOLON) || (flag & FLAG_REPARSING)) mapset((uchar *)";$&|", 0);
3198 inp->promptmode=1;
3199 rcode = parse_stream(&temp, &ctx, inp,
3200 flag & FLAG_CONT_ON_NEWLINE ? -1 : '\n');
3201 #ifdef __U_BOOT__
3202 if (rcode == 1) flag_repeat = 0;
3203 #endif
3204 if (rcode != 1 && ctx.old_flag != 0) {
3205 syntax();
3206 #ifdef __U_BOOT__
3207 flag_repeat = 0;
3208 #endif
3209 }
3210 if (rcode != 1 && ctx.old_flag == 0) {
3211 done_word(&temp, &ctx);
3212 done_pipe(&ctx,PIPE_SEQ);
3213 #ifndef __U_BOOT__
3214 run_list(ctx.list_head);
3215 #else
3216 code = run_list(ctx.list_head);
3217 if (code == -2) { /* exit */
3218 b_free(&temp);
3219 code = 0;
3220 /* XXX hackish way to not allow exit from main loop */
3221 if (inp->peek == file_peek) {
3222 printf("exit not allowed from main input shell.\n");
3223 continue;
3224 }
3225 break;
3226 }
3227 if (code == -1)
3228 flag_repeat = 0;
3229 #endif
3230 } else {
3231 if (ctx.old_flag != 0) {
3232 free(ctx.stack);
3233 b_reset(&temp);
3234 }
3235 #ifdef __U_BOOT__
3236 if (inp->__promptme == 0) printf("<INTERRUPT>\n");
3237 inp->__promptme = 1;
3238 #endif
3239 temp.nonnull = 0;
3240 temp.quote = 0;
3241 inp->p = NULL;
3242 free_pipe_list(ctx.list_head,0);
3243 }
3244 b_free(&temp);
3245 /* loop on syntax errors, return on EOF */
3246 } while (rcode != -1 && !(flag & FLAG_EXIT_FROM_LOOP) &&
3247 (inp->peek != static_peek || b_peek(inp)));
3248 #ifndef __U_BOOT__
3249 return 0;
3250 #else
3251 return (code != 0) ? 1 : 0;
3252 #endif /* __U_BOOT__ */
3253 }
3254
3255 #ifndef __U_BOOT__
3256 static int parse_string_outer(const char *s, int flag)
3257 #else
3258 int parse_string_outer(const char *s, int flag)
3259 #endif /* __U_BOOT__ */
3260 {
3261 struct in_str input;
3262 #ifdef __U_BOOT__
3263 char *p = NULL;
3264 int rcode;
3265 if (!s)
3266 return 1;
3267 if (!*s)
3268 return 0;
3269 if (!(p = strchr(s, '\n')) || *++p) {
3270 p = xmalloc(strlen(s) + 2);
3271 strcpy(p, s);
3272 strcat(p, "\n");
3273 setup_string_in_str(&input, p);
3274 rcode = parse_stream_outer(&input, flag);
3275 free(p);
3276 return rcode;
3277 } else {
3278 #endif
3279 setup_string_in_str(&input, s);
3280 return parse_stream_outer(&input, flag);
3281 #ifdef __U_BOOT__
3282 }
3283 #endif
3284 }
3285
3286 #ifndef __U_BOOT__
3287 static int parse_file_outer(FILE *f)
3288 #else
3289 int parse_file_outer(void)
3290 #endif
3291 {
3292 int rcode;
3293 struct in_str input;
3294 #ifndef __U_BOOT__
3295 setup_file_in_str(&input, f);
3296 #else
3297 setup_file_in_str(&input);
3298 #endif
3299 rcode = parse_stream_outer(&input, FLAG_PARSE_SEMICOLON);
3300 return rcode;
3301 }
3302
3303 #ifdef __U_BOOT__
3304 #ifdef CONFIG_NEEDS_MANUAL_RELOC
3305 static void u_boot_hush_reloc(void)
3306 {
3307 unsigned long addr;
3308 struct reserved_combo *r;
3309
3310 for (r=reserved_list; r<reserved_list+NRES; r++) {
3311 addr = (ulong) (r->literal) + gd->reloc_off;
3312 r->literal = (char *)addr;
3313 }
3314 }
3315 #endif
3316
3317 int u_boot_hush_start(void)
3318 {
3319 if (top_vars == NULL) {
3320 top_vars = malloc(sizeof(struct variables));
3321 top_vars->name = "HUSH_VERSION";
3322 top_vars->value = "0.01";
3323 top_vars->next = NULL;
3324 top_vars->flg_export = 0;
3325 top_vars->flg_read_only = 1;
3326 #ifdef CONFIG_NEEDS_MANUAL_RELOC
3327 u_boot_hush_reloc();
3328 #endif
3329 }
3330 return 0;
3331 }
3332
3333 static void *xmalloc(size_t size)
3334 {
3335 void *p = NULL;
3336
3337 if (!(p = malloc(size))) {
3338 printf("ERROR : memory not allocated\n");
3339 for(;;);
3340 }
3341 return p;
3342 }
3343
3344 static void *xrealloc(void *ptr, size_t size)
3345 {
3346 void *p = NULL;
3347
3348 if (!(p = realloc(ptr, size))) {
3349 printf("ERROR : memory not allocated\n");
3350 for(;;);
3351 }
3352 return p;
3353 }
3354 #endif /* __U_BOOT__ */
3355
3356 #ifndef __U_BOOT__
3357 /* Make sure we have a controlling tty. If we get started under a job
3358 * aware app (like bash for example), make sure we are now in charge so
3359 * we don't fight over who gets the foreground */
3360 static void setup_job_control(void)
3361 {
3362 static pid_t shell_pgrp;
3363 /* Loop until we are in the foreground. */
3364 while (tcgetpgrp (shell_terminal) != (shell_pgrp = getpgrp ()))
3365 kill (- shell_pgrp, SIGTTIN);
3366
3367 /* Ignore interactive and job-control signals. */
3368 signal(SIGINT, SIG_IGN);
3369 signal(SIGQUIT, SIG_IGN);
3370 signal(SIGTERM, SIG_IGN);
3371 signal(SIGTSTP, SIG_IGN);
3372 signal(SIGTTIN, SIG_IGN);
3373 signal(SIGTTOU, SIG_IGN);
3374 signal(SIGCHLD, SIG_IGN);
3375
3376 /* Put ourselves in our own process group. */
3377 setsid();
3378 shell_pgrp = getpid ();
3379 setpgid (shell_pgrp, shell_pgrp);
3380
3381 /* Grab control of the terminal. */
3382 tcsetpgrp(shell_terminal, shell_pgrp);
3383 }
3384
3385 int hush_main(int argc, char * const *argv)
3386 {
3387 int opt;
3388 FILE *input;
3389 char **e = environ;
3390
3391 /* XXX what should these be while sourcing /etc/profile? */
3392 global_argc = argc;
3393 global_argv = argv;
3394
3395 /* (re?) initialize globals. Sometimes hush_main() ends up calling
3396 * hush_main(), therefore we cannot rely on the BSS to zero out this
3397 * stuff. Reset these to 0 every time. */
3398 ifs = NULL;
3399 /* map[] is taken care of with call to update_ifs_map() */
3400 fake_mode = 0;
3401 interactive = 0;
3402 close_me_head = NULL;
3403 last_bg_pid = 0;
3404 job_list = NULL;
3405 last_jobid = 0;
3406
3407 /* Initialize some more globals to non-zero values */
3408 set_cwd();
3409 #ifdef CONFIG_FEATURE_COMMAND_EDITING
3410 cmdedit_set_initial_prompt();
3411 #else
3412 PS1 = NULL;
3413 #endif
3414 PS2 = "> ";
3415
3416 /* initialize our shell local variables with the values
3417 * currently living in the environment */
3418 if (e) {
3419 for (; *e; e++)
3420 set_local_var(*e, 2); /* without call putenv() */
3421 }
3422
3423 last_return_code=EXIT_SUCCESS;
3424
3425
3426 if (argv[0] && argv[0][0] == '-') {
3427 debug_printf("\nsourcing /etc/profile\n");
3428 if ((input = fopen("/etc/profile", "r")) != NULL) {
3429 mark_open(fileno(input));
3430 parse_file_outer(input);
3431 mark_closed(fileno(input));
3432 fclose(input);
3433 }
3434 }
3435 input=stdin;
3436
3437 while ((opt = getopt(argc, argv, "c:xif")) > 0) {
3438 switch (opt) {
3439 case 'c':
3440 {
3441 global_argv = argv+optind;
3442 global_argc = argc-optind;
3443 opt = parse_string_outer(optarg, FLAG_PARSE_SEMICOLON);
3444 goto final_return;
3445 }
3446 break;
3447 case 'i':
3448 interactive++;
3449 break;
3450 case 'f':
3451 fake_mode++;
3452 break;
3453 default:
3454 #ifndef BB_VER
3455 fprintf(stderr, "Usage: sh [FILE]...\n"
3456 " or: sh -c command [args]...\n\n");
3457 exit(EXIT_FAILURE);
3458 #else
3459 show_usage();
3460 #endif
3461 }
3462 }
3463 /* A shell is interactive if the `-i' flag was given, or if all of
3464 * the following conditions are met:
3465 * no -c command
3466 * no arguments remaining or the -s flag given
3467 * standard input is a terminal
3468 * standard output is a terminal
3469 * Refer to Posix.2, the description of the `sh' utility. */
3470 if (argv[optind]==NULL && input==stdin &&
3471 isatty(fileno(stdin)) && isatty(fileno(stdout))) {
3472 interactive++;
3473 }
3474
3475 debug_printf("\ninteractive=%d\n", interactive);
3476 if (interactive) {
3477 /* Looks like they want an interactive shell */
3478 #ifndef CONFIG_FEATURE_SH_EXTRA_QUIET
3479 printf( "\n\n" BB_BANNER " hush - the humble shell v0.01 (testing)\n");
3480 printf( "Enter 'help' for a list of built-in commands.\n\n");
3481 #endif
3482 setup_job_control();
3483 }
3484
3485 if (argv[optind]==NULL) {
3486 opt=parse_file_outer(stdin);
3487 goto final_return;
3488 }
3489
3490 debug_printf("\nrunning script '%s'\n", argv[optind]);
3491 global_argv = argv+optind;
3492 global_argc = argc-optind;
3493 input = xfopen(argv[optind], "r");
3494 opt = parse_file_outer(input);
3495
3496 #ifdef CONFIG_FEATURE_CLEAN_UP
3497 fclose(input);
3498 if (cwd && cwd != unknown)
3499 free((char*)cwd);
3500 {
3501 struct variables *cur, *tmp;
3502 for(cur = top_vars; cur; cur = tmp) {
3503 tmp = cur->next;
3504 if (!cur->flg_read_only) {
3505 free(cur->name);
3506 free(cur->value);
3507 free(cur);
3508 }
3509 }
3510 }
3511 #endif
3512
3513 final_return:
3514 return(opt?opt:last_return_code);
3515 }
3516 #endif
3517
3518 static char *insert_var_value(char *inp)
3519 {
3520 return insert_var_value_sub(inp, 0);
3521 }
3522
3523 static char *insert_var_value_sub(char *inp, int tag_subst)
3524 {
3525 int res_str_len = 0;
3526 int len;
3527 int done = 0;
3528 char *p, *p1, *res_str = NULL;
3529
3530 while ((p = strchr(inp, SPECIAL_VAR_SYMBOL))) {
3531 /* check the beginning of the string for normal characters */
3532 if (p != inp) {
3533 /* copy any characters to the result string */
3534 len = p - inp;
3535 res_str = xrealloc(res_str, (res_str_len + len));
3536 strncpy((res_str + res_str_len), inp, len);
3537 res_str_len += len;
3538 }
3539 inp = ++p;
3540 /* find the ending marker */
3541 p = strchr(inp, SPECIAL_VAR_SYMBOL);
3542 *p = '\0';
3543 /* look up the value to substitute */
3544 if ((p1 = lookup_param(inp))) {
3545 if (tag_subst)
3546 len = res_str_len + strlen(p1) + 2;
3547 else
3548 len = res_str_len + strlen(p1);
3549 res_str = xrealloc(res_str, (1 + len));
3550 if (tag_subst) {
3551 /*
3552 * copy the variable value to the result
3553 * string
3554 */
3555 strcpy((res_str + res_str_len + 1), p1);
3556
3557 /*
3558 * mark the replaced text to be accepted as
3559 * is
3560 */
3561 res_str[res_str_len] = SUBSTED_VAR_SYMBOL;
3562 res_str[res_str_len + 1 + strlen(p1)] =
3563 SUBSTED_VAR_SYMBOL;
3564 } else
3565 /*
3566 * copy the variable value to the result
3567 * string
3568 */
3569 strcpy((res_str + res_str_len), p1);
3570
3571 res_str_len = len;
3572 }
3573 *p = SPECIAL_VAR_SYMBOL;
3574 inp = ++p;
3575 done = 1;
3576 }
3577 if (done) {
3578 res_str = xrealloc(res_str, (1 + res_str_len + strlen(inp)));
3579 strcpy((res_str + res_str_len), inp);
3580 while ((p = strchr(res_str, '\n'))) {
3581 *p = ' ';
3582 }
3583 }
3584 return (res_str == NULL) ? inp : res_str;
3585 }
3586
3587 static char **make_list_in(char **inp, char *name)
3588 {
3589 int len, i;
3590 int name_len = strlen(name);
3591 int n = 0;
3592 char **list;
3593 char *p1, *p2, *p3;
3594
3595 /* create list of variable values */
3596 list = xmalloc(sizeof(*list));
3597 for (i = 0; inp[i]; i++) {
3598 p3 = insert_var_value(inp[i]);
3599 p1 = p3;
3600 while (*p1) {
3601 if (*p1 == ' ') {
3602 p1++;
3603 continue;
3604 }
3605 if ((p2 = strchr(p1, ' '))) {
3606 len = p2 - p1;
3607 } else {
3608 len = strlen(p1);
3609 p2 = p1 + len;
3610 }
3611 /* we use n + 2 in realloc for list,because we add
3612 * new element and then we will add NULL element */
3613 list = xrealloc(list, sizeof(*list) * (n + 2));
3614 list[n] = xmalloc(2 + name_len + len);
3615 strcpy(list[n], name);
3616 strcat(list[n], "=");
3617 strncat(list[n], p1, len);
3618 list[n++][name_len + len + 1] = '\0';
3619 p1 = p2;
3620 }
3621 if (p3 != inp[i]) free(p3);
3622 }
3623 list[n] = NULL;
3624 return list;
3625 }
3626
3627 /*
3628 * Make new string for parser
3629 * inp - array of argument strings to flatten
3630 * nonnull - indicates argument was quoted when originally parsed
3631 */
3632 static char *make_string(char **inp, int *nonnull)
3633 {
3634 char *p;
3635 char *str = NULL;
3636 int n;
3637 int len = 2;
3638 char *noeval_str;
3639 int noeval = 0;
3640
3641 noeval_str = get_local_var("HUSH_NO_EVAL");
3642 if (noeval_str != NULL && *noeval_str != '0' && *noeval_str != '\0')
3643 noeval = 1;
3644 for (n = 0; inp[n]; n++) {
3645 p = insert_var_value_sub(inp[n], noeval);
3646 str = xrealloc(str, (len + strlen(p) + (2 * nonnull[n])));
3647 if (n) {
3648 strcat(str, " ");
3649 } else {
3650 *str = '\0';
3651 }
3652 if (nonnull[n])
3653 strcat(str, "'");
3654 strcat(str, p);
3655 if (nonnull[n])
3656 strcat(str, "'");
3657 len = strlen(str) + 3;
3658 if (p != inp[n]) free(p);
3659 }
3660 len = strlen(str);
3661 *(str + len) = '\n';
3662 *(str + len + 1) = '\0';
3663 return str;
3664 }
3665
3666 #ifdef __U_BOOT__
3667 static int do_showvar(struct cmd_tbl *cmdtp, int flag, int argc,
3668 char *const argv[])
3669 {
3670 int i, k;
3671 int rcode = 0;
3672 struct variables *cur;
3673
3674 if (argc == 1) { /* Print all env variables */
3675 for (cur = top_vars; cur; cur = cur->next) {
3676 printf ("%s=%s\n", cur->name, cur->value);
3677 if (ctrlc ()) {
3678 puts ("\n ** Abort\n");
3679 return 1;
3680 }
3681 }
3682 return 0;
3683 }
3684 for (i = 1; i < argc; ++i) { /* print single env variables */
3685 char *name = argv[i];
3686
3687 k = -1;
3688 for (cur = top_vars; cur; cur = cur->next) {
3689 if(strcmp (cur->name, name) == 0) {
3690 k = 0;
3691 printf ("%s=%s\n", cur->name, cur->value);
3692 }
3693 if (ctrlc ()) {
3694 puts ("\n ** Abort\n");
3695 return 1;
3696 }
3697 }
3698 if (k < 0) {
3699 printf ("## Error: \"%s\" not defined\n", name);
3700 rcode ++;
3701 }
3702 }
3703 return rcode;
3704 }
3705
3706 U_BOOT_CMD(
3707 showvar, CONFIG_SYS_MAXARGS, 1, do_showvar,
3708 "print local hushshell variables",
3709 "\n - print values of all hushshell variables\n"
3710 "showvar name ...\n"
3711 " - print value of hushshell variable 'name'"
3712 );
3713
3714 #endif
3715 /****************************************************************************/
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