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hush: Add default value substitution support
[people/ms/u-boot.git] / common / hush.c
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fe8c2806
WD		 1/*
2 * sh.c -- a prototype Bourne shell grammar parser
3 * Intended to follow the original Thompson and Ritchie
4 * "small and simple is beautiful" philosophy, which
5 * incidentally is a good match to today's BusyBox.
6 *
7 * Copyright (C) 2000,2001 Larry Doolittle <larry@doolittle.boa.org>
8 *
9 * Credits:
10 * The parser routines proper are all original material, first
11 * written Dec 2000 and Jan 2001 by Larry Doolittle.
12 * The execution engine, the builtins, and much of the underlying
13 * support has been adapted from busybox-0.49pre's lash,
14 * which is Copyright (C) 2000 by Lineo, Inc., and
15 * written by Erik Andersen <andersen@lineo.com>, <andersee@debian.org>.
16 * That, in turn, is based in part on ladsh.c, by Michael K. Johnson and
17 * Erik W. Troan, which they placed in the public domain. I don't know
18 * how much of the Johnson/Troan code has survived the repeated rewrites.
19 * Other credits:
fe8c2806
WD		 20 * b_addchr() derived from similar w_addchar function in glibc-2.2
21 * setup_redirect(), redirect_opt_num(), and big chunks of main()
22 * and many builtins derived from contributions by Erik Andersen
23 * miscellaneous bugfixes from Matt Kraai
24 *
25 * There are two big (and related) architecture differences between
26 * this parser and the lash parser. One is that this version is
27 * actually designed from the ground up to understand nearly all
28 * of the Bourne grammar. The second, consequential change is that
29 * the parser and input reader have been turned inside out. Now,
30 * the parser is in control, and asks for input as needed. The old
31 * way had the input reader in control, and it asked for parsing to
32 * take place as needed. The new way makes it much easier to properly
33 * handle the recursion implicit in the various substitutions, especially
34 * across continuation lines.
35 *
36 * Bash grammar not implemented: (how many of these were in original sh?)
37 * $@ (those sure look like weird quoting rules)
38 * $_
39 * ! negation operator for pipes
40 * &> and >& redirection of stdout+stderr
41 * Brace Expansion
42 * Tilde Expansion
43 * fancy forms of Parameter Expansion
44 * aliases
45 * Arithmetic Expansion
46 * <(list) and >(list) Process Substitution
47 * reserved words: case, esac, select, function
48 * Here Documents ( << word )
49 * Functions
50 * Major bugs:
51 * job handling woefully incomplete and buggy
52 * reserved word execution woefully incomplete and buggy
53 * to-do:
54 * port selected bugfixes from post-0.49 busybox lash - done?
55 * finish implementing reserved words: for, while, until, do, done
56 * change { and } from special chars to reserved words
57 * builtins: break, continue, eval, return, set, trap, ulimit
58 * test magic exec
59 * handle children going into background
60 * clean up recognition of null pipes
61 * check setting of global_argc and global_argv
62 * control-C handling, probably with longjmp
63 * follow IFS rules more precisely, including update semantics
64 * figure out what to do with backslash-newline
65 * explain why we use signal instead of sigaction
66 * propagate syntax errors, die on resource errors?
67 * continuation lines, both explicit and implicit - done?
68 * memory leak finding and plugging - done?
69 * more testing, especially quoting rules and redirection
70 * document how quoting rules not precisely followed for variable assignments
71 * maybe change map[] to use 2-bit entries
72 * (eventually) remove all the printf's
73 *
74 * This program is free software; you can redistribute it and/or modify
75 * it under the terms of the GNU General Public License as published by
76 * the Free Software Foundation; either version 2 of the License, or
77 * (at your option) any later version.
78 *
79 * This program is distributed in the hope that it will be useful,
80 * but WITHOUT ANY WARRANTY; without even the implied warranty of
81 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
82 * General Public License for more details.
83 *
84 * You should have received a copy of the GNU General Public License
85 * along with this program; if not, write to the Free Software
86 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
87 */
88#define __U_BOOT__
89#ifdef __U_BOOT__
90#include <malloc.h> /* malloc, free, realloc*/
91#include <linux/ctype.h> /* isalpha, isdigit */
92#include <common.h> /* readline */
93#include <hush.h>
94#include <command.h> /* find_cmd */
219f4788
TR		 95#ifndef CONFIG_SYS_PROMPT_HUSH_PS2
96#define CONFIG_SYS_PROMPT_HUSH_PS2 "> "
97#endif
fe8c2806 98#endif
fe8c2806
WD		 99#ifndef __U_BOOT__
100#include <ctype.h> /* isalpha, isdigit */
101#include <unistd.h> /* getpid */
102#include <stdlib.h> /* getenv, atoi */
103#include <string.h> /* strchr */
104#include <stdio.h> /* popen etc. */
105#include <glob.h> /* glob, of course */
106#include <stdarg.h> /* va_list */
107#include <errno.h>
108#include <fcntl.h>
109#include <getopt.h> /* should be pretty obvious */
110
111#include <sys/stat.h> /* ulimit */
112#include <sys/types.h>
113#include <sys/wait.h>
114#include <signal.h>
115
116/* #include <dmalloc.h> */
fe8c2806 117
d0fb80c3 118#if 1
fe8c2806
WD		 119#include "busybox.h"
120#include "cmdedit.h"
121#else
122#define applet_name "hush"
123#include "standalone.h"
124#define hush_main main
d0fb80c3
WD		 125#undef CONFIG_FEATURE_SH_FANCY_PROMPT
126#define BB_BANNER
fe8c2806
WD		 127#endif
128#endif
129#define SPECIAL_VAR_SYMBOL 03
130#ifndef __U_BOOT__
131#define FLAG_EXIT_FROM_LOOP 1
132#define FLAG_PARSE_SEMICOLON (1 << 1) /* symbol ';' is special for parser */
133#define FLAG_REPARSING (1 << 2) /* >= 2nd pass */
134
135#endif
136
137#ifdef __U_BOOT__
d87080b7
WD		 138DECLARE_GLOBAL_DATA_PTR;
139
fe8c2806
WD		 140#define EXIT_SUCCESS 0
141#define EOF -1
142#define syntax() syntax_err()
143#define xstrdup strdup
144#define error_msg printf
145#else
146typedef enum {
147 REDIRECT_INPUT = 1,
148 REDIRECT_OVERWRITE = 2,
149 REDIRECT_APPEND = 3,
150 REDIRECT_HEREIS = 4,
151 REDIRECT_IO = 5
152} redir_type;
153
154/* The descrip member of this structure is only used to make debugging
155 * output pretty */
156struct {int mode; int default_fd; char *descrip;} redir_table[] = {
157 { 0, 0, "()" },
158 { O_RDONLY, 0, "<" },
159 { O_CREAT|O_TRUNC|O_WRONLY, 1, ">" },
160 { O_CREAT|O_APPEND|O_WRONLY, 1, ">>" },
161 { O_RDONLY, -1, "<<" },
162 { O_RDWR, 1, "<>" }
163};
164#endif
165
166typedef enum {
167 PIPE_SEQ = 1,
168 PIPE_AND = 2,
169 PIPE_OR = 3,
170 PIPE_BG = 4,
171} pipe_style;
172
173/* might eventually control execution */
174typedef enum {
175 RES_NONE = 0,
176 RES_IF = 1,
177 RES_THEN = 2,
178 RES_ELIF = 3,
179 RES_ELSE = 4,
180 RES_FI = 5,
181 RES_FOR = 6,
182 RES_WHILE = 7,
183 RES_UNTIL = 8,
184 RES_DO = 9,
185 RES_DONE = 10,
186 RES_XXXX = 11,
187 RES_IN = 12,
188 RES_SNTX = 13
189} reserved_style;
190#define FLAG_END (1<<RES_NONE)
191#define FLAG_IF (1<<RES_IF)
192#define FLAG_THEN (1<<RES_THEN)
193#define FLAG_ELIF (1<<RES_ELIF)
194#define FLAG_ELSE (1<<RES_ELSE)
195#define FLAG_FI (1<<RES_FI)
196#define FLAG_FOR (1<<RES_FOR)
197#define FLAG_WHILE (1<<RES_WHILE)
198#define FLAG_UNTIL (1<<RES_UNTIL)
199#define FLAG_DO (1<<RES_DO)
200#define FLAG_DONE (1<<RES_DONE)
201#define FLAG_IN (1<<RES_IN)
202#define FLAG_START (1<<RES_XXXX)
203
204/* This holds pointers to the various results of parsing */
205struct p_context {
206 struct child_prog *child;
207 struct pipe *list_head;
208 struct pipe *pipe;
209#ifndef __U_BOOT__
210 struct redir_struct *pending_redirect;
211#endif
212 reserved_style w;
213 int old_flag; /* for figuring out valid reserved words */
214 struct p_context *stack;
215 int type; /* define type of parser : ";$" common or special symbol */
216 /* How about quoting status? */
217};
218
219#ifndef __U_BOOT__
220struct redir_struct {
221 redir_type type; /* type of redirection */
222 int fd; /* file descriptor being redirected */
223 int dup; /* -1, or file descriptor being duplicated */
224 struct redir_struct *next; /* pointer to the next redirect in the list */
225 glob_t word; /* *word.gl_pathv is the filename */
226};
227#endif
228
229struct child_prog {
230#ifndef __U_BOOT__
231 pid_t pid; /* 0 if exited */
232#endif
233 char **argv; /* program name and arguments */
234#ifdef __U_BOOT__
235 int argc; /* number of program arguments */
236#endif
237 struct pipe *group; /* if non-NULL, first in group or subshell */
238#ifndef __U_BOOT__
239 int subshell; /* flag, non-zero if group must be forked */
240 struct redir_struct *redirects; /* I/O redirections */
241 glob_t glob_result; /* result of parameter globbing */
242 int is_stopped; /* is the program currently running? */
243 struct pipe *family; /* pointer back to the child's parent pipe */
244#endif
245 int sp; /* number of SPECIAL_VAR_SYMBOL */
246 int type;
247};
248
249struct pipe {
250#ifndef __U_BOOT__
251 int jobid; /* job number */
252#endif
253 int num_progs; /* total number of programs in job */
254#ifndef __U_BOOT__
255 int running_progs; /* number of programs running */
256 char *text; /* name of job */
257 char *cmdbuf; /* buffer various argv's point into */
258 pid_t pgrp; /* process group ID for the job */
259#endif
260 struct child_prog *progs; /* array of commands in pipe */
261 struct pipe *next; /* to track background commands */
262#ifndef __U_BOOT__
263 int stopped_progs; /* number of programs alive, but stopped */
264 int job_context; /* bitmask defining current context */
265#endif
266 pipe_style followup; /* PIPE_BG, PIPE_SEQ, PIPE_OR, PIPE_AND */
267 reserved_style r_mode; /* supports if, for, while, until */
268};
269
270#ifndef __U_BOOT__
271struct close_me {
272 int fd;
273 struct close_me *next;
274};
275#endif
276
277struct variables {
278 char *name;
279 char *value;
280 int flg_export;
281 int flg_read_only;
282 struct variables *next;
283};
284
285/* globals, connect us to the outside world
286 * the first three support $?, $#, and $1 */
287#ifndef __U_BOOT__
288char **global_argv;
289unsigned int global_argc;
290#endif
291unsigned int last_return_code;
c26e454d 292int nesting_level;
fe8c2806
WD		 293#ifndef __U_BOOT__
294extern char **environ; /* This is in <unistd.h>, but protected with __USE_GNU */
295#endif
296
297/* "globals" within this file */
77ddac94 298static uchar *ifs;
fe8c2806
WD		 299static char map[256];
300#ifndef __U_BOOT__
301static int fake_mode;
302static int interactive;
303static struct close_me *close_me_head;
304static const char *cwd;
305static struct pipe *job_list;
306static unsigned int last_bg_pid;
307static unsigned int last_jobid;
308static unsigned int shell_terminal;
309static char *PS1;
310static char *PS2;
311struct variables shell_ver = { "HUSH_VERSION", "0.01", 1, 1, 0 };
312struct variables *top_vars = &shell_ver;
313#else
314static int flag_repeat = 0;
315static int do_repeat = 0;
2d5b561e 316static struct variables *top_vars = NULL ;
fe8c2806
WD		 317#endif /*__U_BOOT__ */
318
319#define B_CHUNK (100)
320#define B_NOSPAC 1
321
322typedef struct {
323 char *data;
324 int length;
325 int maxlen;
326 int quote;
327 int nonnull;
328} o_string;
329#define NULL_O_STRING {NULL,0,0,0,0}
330/* used for initialization:
331 o_string foo = NULL_O_STRING; */
332
333/* I can almost use ordinary FILE *. Is open_memstream() universally
334 * available? Where is it documented? */
335struct in_str {
336 const char *p;
337#ifndef __U_BOOT__
338 char peek_buf[2];
339#endif
340 int __promptme;
341 int promptmode;
342#ifndef __U_BOOT__
343 FILE *file;
344#endif
345 int (*get) (struct in_str *);
346 int (*peek) (struct in_str *);
347};
348#define b_getch(input) ((input)->get(input))
349#define b_peek(input) ((input)->peek(input))
350
351#ifndef __U_BOOT__
352#define JOB_STATUS_FORMAT "[%d] %-22s %.40s\n"
353
354struct built_in_command {
355 char *cmd; /* name */
356 char *descr; /* description */
357 int (*function) (struct child_prog *); /* function ptr */
358};
359#endif
360
4cacf7c6
SR		 361/* define DEBUG_SHELL for debugging output (obviously ;-)) */
362#if 0
363#define DEBUG_SHELL
364#endif
365
fe8c2806
WD		 366/* This should be in utility.c */
367#ifdef DEBUG_SHELL
368#ifndef __U_BOOT__
369static void debug_printf(const char *format, ...)
370{
371 va_list args;
372 va_start(args, format);
373 vfprintf(stderr, format, args);
374 va_end(args);
375}
376#else
4cacf7c6 377#define debug_printf(fmt,args...) printf (fmt ,##args)
fe8c2806
WD		 378#endif
379#else
380static inline void debug_printf(const char *format, ...) { }
381#endif
382#define final_printf debug_printf
383
384#ifdef __U_BOOT__
385static void syntax_err(void) {
386 printf("syntax error\n");
387}
388#else
389static void __syntax(char *file, int line) {
390 error_msg("syntax error %s:%d", file, line);
391}
392#define syntax() __syntax(__FILE__, __LINE__)
393#endif
394
395#ifdef __U_BOOT__
396static void *xmalloc(size_t size);
397static void *xrealloc(void *ptr, size_t size);
398#else
399/* Index of subroutines: */
400/* function prototypes for builtins */
401static int builtin_cd(struct child_prog *child);
402static int builtin_env(struct child_prog *child);
403static int builtin_eval(struct child_prog *child);
404static int builtin_exec(struct child_prog *child);
405static int builtin_exit(struct child_prog *child);
406static int builtin_export(struct child_prog *child);
407static int builtin_fg_bg(struct child_prog *child);
408static int builtin_help(struct child_prog *child);
409static int builtin_jobs(struct child_prog *child);
410static int builtin_pwd(struct child_prog *child);
411static int builtin_read(struct child_prog *child);
412static int builtin_set(struct child_prog *child);
413static int builtin_shift(struct child_prog *child);
414static int builtin_source(struct child_prog *child);
415static int builtin_umask(struct child_prog *child);
416static int builtin_unset(struct child_prog *child);
417static int builtin_not_written(struct child_prog *child);
418#endif
419/* o_string manipulation: */
420static int b_check_space(o_string *o, int len);
421static int b_addchr(o_string *o, int ch);
422static void b_reset(o_string *o);
423static int b_addqchr(o_string *o, int ch, int quote);
c26e454d 424#ifndef __U_BOOT__
fe8c2806 425static int b_adduint(o_string *o, unsigned int i);
c26e454d 426#endif
fe8c2806
WD		 427/* in_str manipulations: */
428static int static_get(struct in_str *i);
429static int static_peek(struct in_str *i);
430static int file_get(struct in_str *i);
431static int file_peek(struct in_str *i);
432#ifndef __U_BOOT__
433static void setup_file_in_str(struct in_str *i, FILE *f);
434#else
435static void setup_file_in_str(struct in_str *i);
436#endif
437static void setup_string_in_str(struct in_str *i, const char *s);
438#ifndef __U_BOOT__
439/* close_me manipulations: */
440static void mark_open(int fd);
441static void mark_closed(int fd);
d0fb80c3 442static void close_all(void);
fe8c2806
WD		 443#endif
444/* "run" the final data structures: */
445static char *indenter(int i);
446static int free_pipe_list(struct pipe *head, int indent);
447static int free_pipe(struct pipe *pi, int indent);
448/* really run the final data structures: */
449#ifndef __U_BOOT__
450static int setup_redirects(struct child_prog *prog, int squirrel[]);
451#endif
452static int run_list_real(struct pipe *pi);
453#ifndef __U_BOOT__
454static void pseudo_exec(struct child_prog *child) __attribute__ ((noreturn));
455#endif
456static int run_pipe_real(struct pipe *pi);
457/* extended glob support: */
458#ifndef __U_BOOT__
459static int globhack(const char *src, int flags, glob_t *pglob);
460static int glob_needed(const char *s);
461static int xglob(o_string *dest, int flags, glob_t *pglob);
462#endif
463/* variable assignment: */
464static int is_assignment(const char *s);
465/* data structure manipulation: */
466#ifndef __U_BOOT__
467static int setup_redirect(struct p_context *ctx, int fd, redir_type style, struct in_str *input);
468#endif
469static void initialize_context(struct p_context *ctx);
470static int done_word(o_string *dest, struct p_context *ctx);
471static int done_command(struct p_context *ctx);
472static int done_pipe(struct p_context *ctx, pipe_style type);
473/* primary string parsing: */
474#ifndef __U_BOOT__
475static int redirect_dup_num(struct in_str *input);
476static int redirect_opt_num(o_string *o);
477static int process_command_subs(o_string *dest, struct p_context *ctx, struct in_str *input, int subst_end);
478static int parse_group(o_string *dest, struct p_context *ctx, struct in_str *input, int ch);
479#endif
480static char *lookup_param(char *src);
481static char *make_string(char **inp);
482static int handle_dollar(o_string *dest, struct p_context *ctx, struct in_str *input);
483#ifndef __U_BOOT__
484static int parse_string(o_string *dest, struct p_context *ctx, const char *src);
485#endif
486static int parse_stream(o_string *dest, struct p_context *ctx, struct in_str *input0, int end_trigger);
487/* setup: */
488static int parse_stream_outer(struct in_str *inp, int flag);
489#ifndef __U_BOOT__
490static int parse_string_outer(const char *s, int flag);
491static int parse_file_outer(FILE *f);
492#endif
493#ifndef __U_BOOT__
494/* job management: */
495static int checkjobs(struct pipe* fg_pipe);
496static void insert_bg_job(struct pipe *pi);
497static void remove_bg_job(struct pipe *pi);
498#endif
499/* local variable support */
500static char **make_list_in(char **inp, char *name);
501static char *insert_var_value(char *inp);
fe8c2806
WD		 502
503#ifndef __U_BOOT__
504/* Table of built-in functions. They can be forked or not, depending on
505 * context: within pipes, they fork. As simple commands, they do not.
506 * When used in non-forking context, they can change global variables
507 * in the parent shell process. If forked, of course they can not.
508 * For example, 'unset foo | whatever' will parse and run, but foo will
509 * still be set at the end. */
510static struct built_in_command bltins[] = {
511 {"bg", "Resume a job in the background", builtin_fg_bg},
512 {"break", "Exit for, while or until loop", builtin_not_written},
513 {"cd", "Change working directory", builtin_cd},
514 {"continue", "Continue for, while or until loop", builtin_not_written},
515 {"env", "Print all environment variables", builtin_env},
516 {"eval", "Construct and run shell command", builtin_eval},
517 {"exec", "Exec command, replacing this shell with the exec'd process",
518 builtin_exec},
519 {"exit", "Exit from shell()", builtin_exit},
520 {"export", "Set environment variable", builtin_export},
521 {"fg", "Bring job into the foreground", builtin_fg_bg},
522 {"jobs", "Lists the active jobs", builtin_jobs},
523 {"pwd", "Print current directory", builtin_pwd},
524 {"read", "Input environment variable", builtin_read},
525 {"return", "Return from a function", builtin_not_written},
526 {"set", "Set/unset shell local variables", builtin_set},
527 {"shift", "Shift positional parameters", builtin_shift},
528 {"trap", "Trap signals", builtin_not_written},
529 {"ulimit","Controls resource limits", builtin_not_written},
530 {"umask","Sets file creation mask", builtin_umask},
531 {"unset", "Unset environment variable", builtin_unset},
532 {".", "Source-in and run commands in a file", builtin_source},
533 {"help", "List shell built-in commands", builtin_help},
534 {NULL, NULL, NULL}
535};
536
537static const char *set_cwd(void)
538{
539 if(cwd==unknown)
540 cwd = NULL; /* xgetcwd(arg) called free(arg) */
541 cwd = xgetcwd((char *)cwd);
542 if (!cwd)
543 cwd = unknown;
544 return cwd;
545}
546
547/* built-in 'eval' handler */
548static int builtin_eval(struct child_prog *child)
549{
550 char *str = NULL;
551 int rcode = EXIT_SUCCESS;
552
553 if (child->argv[1]) {
554 str = make_string(child->argv + 1);
555 parse_string_outer(str, FLAG_EXIT_FROM_LOOP |
556 FLAG_PARSE_SEMICOLON);
557 free(str);
558 rcode = last_return_code;
559 }
560 return rcode;
561}
562
563/* built-in 'cd <path>' handler */
564static int builtin_cd(struct child_prog *child)
565{
566 char *newdir;
567 if (child->argv[1] == NULL)
568 newdir = getenv("HOME");
569 else
570 newdir = child->argv[1];
571 if (chdir(newdir)) {
572 printf("cd: %s: %s\n", newdir, strerror(errno));
573 return EXIT_FAILURE;
574 }
575 set_cwd();
576 return EXIT_SUCCESS;
577}
578
579/* built-in 'env' handler */
580static int builtin_env(struct child_prog *dummy)
581{
582 char **e = environ;
583 if (e == NULL) return EXIT_FAILURE;
584 for (; *e; e++) {
585 puts(*e);
586 }
587 return EXIT_SUCCESS;
588}
589
590/* built-in 'exec' handler */
591static int builtin_exec(struct child_prog *child)
592{
593 if (child->argv[1] == NULL)
594 return EXIT_SUCCESS; /* Really? */
595 child->argv++;
596 pseudo_exec(child);
597 /* never returns */
598}
599
600/* built-in 'exit' handler */
601static int builtin_exit(struct child_prog *child)
602{
603 if (child->argv[1] == NULL)
604 exit(last_return_code);
605 exit (atoi(child->argv[1]));
606}
607
608/* built-in 'export VAR=value' handler */
609static int builtin_export(struct child_prog *child)
610{
611 int res = 0;
612 char *name = child->argv[1];
613
614 if (name == NULL) {
615 return (builtin_env(child));
616 }
617
618 name = strdup(name);
619
620 if(name) {
621 char *value = strchr(name, '=');
622
623 if (!value) {
624 char *tmp;
625 /* They are exporting something without an =VALUE */
626
627 value = get_local_var(name);
628 if (value) {
629 size_t ln = strlen(name);
630
631 tmp = realloc(name, ln+strlen(value)+2);
632 if(tmp==NULL)
633 res = -1;
634 else {
635 sprintf(tmp+ln, "=%s", value);
636 name = tmp;
637 }
638 } else {
639 /* bash does not return an error when trying to export
640 * an undefined variable. Do likewise. */
641 res = 1;
642 }
643 }
644 }
645 if (res<0)
646 perror_msg("export");
647 else if(res==0)
648 res = set_local_var(name, 1);
649 else
650 res = 0;
651 free(name);
652 return res;
653}
654
655/* built-in 'fg' and 'bg' handler */
656static int builtin_fg_bg(struct child_prog *child)
657{
658 int i, jobnum;
659 struct pipe *pi=NULL;
660
661 if (!interactive)
662 return EXIT_FAILURE;
663 /* If they gave us no args, assume they want the last backgrounded task */
664 if (!child->argv[1]) {
665 for (pi = job_list; pi; pi = pi->next) {
666 if (pi->jobid == last_jobid) {
667 break;
668 }
669 }
670 if (!pi) {
671 error_msg("%s: no current job", child->argv[0]);
672 return EXIT_FAILURE;
673 }
674 } else {
675 if (sscanf(child->argv[1], "%%%d", &jobnum) != 1) {
676 error_msg("%s: bad argument '%s'", child->argv[0], child->argv[1]);
677 return EXIT_FAILURE;
678 }
679 for (pi = job_list; pi; pi = pi->next) {
680 if (pi->jobid == jobnum) {
681 break;
682 }
683 }
684 if (!pi) {
685 error_msg("%s: %d: no such job", child->argv[0], jobnum);
686 return EXIT_FAILURE;
687 }
688 }
689
690 if (*child->argv[0] == 'f') {
691 /* Put the job into the foreground. */
692 tcsetpgrp(shell_terminal, pi->pgrp);
693 }
694
695 /* Restart the processes in the job */
696 for (i = 0; i < pi->num_progs; i++)
697 pi->progs[i].is_stopped = 0;
698
699 if ( (i=kill(- pi->pgrp, SIGCONT)) < 0) {
700 if (i == ESRCH) {
701 remove_bg_job(pi);
702 } else {
703 perror_msg("kill (SIGCONT)");
704 }
705 }
706
707 pi->stopped_progs = 0;
708 return EXIT_SUCCESS;
709}
710
711/* built-in 'help' handler */
712static int builtin_help(struct child_prog *dummy)
713{
714 struct built_in_command *x;
715
716 printf("\nBuilt-in commands:\n");
717 printf("-------------------\n");
718 for (x = bltins; x->cmd; x++) {
719 if (x->descr==NULL)
720 continue;
721 printf("%s\t%s\n", x->cmd, x->descr);
722 }
723 printf("\n\n");
724 return EXIT_SUCCESS;
725}
726
727/* built-in 'jobs' handler */
728static int builtin_jobs(struct child_prog *child)
729{
730 struct pipe *job;
731 char *status_string;
732
733 for (job = job_list; job; job = job->next) {
734 if (job->running_progs == job->stopped_progs)
735 status_string = "Stopped";
736 else
737 status_string = "Running";
738
739 printf(JOB_STATUS_FORMAT, job->jobid, status_string, job->text);
740 }
741 return EXIT_SUCCESS;
742}
743
744
745/* built-in 'pwd' handler */
746static int builtin_pwd(struct child_prog *dummy)
747{
748 puts(set_cwd());
749 return EXIT_SUCCESS;
750}
751
752/* built-in 'read VAR' handler */
753static int builtin_read(struct child_prog *child)
754{
755 int res;
756
757 if (child->argv[1]) {
758 char string[BUFSIZ];
759 char *var = 0;
760
761 string[0] = 0; /* In case stdin has only EOF */
762 /* read string */
763 fgets(string, sizeof(string), stdin);
764 chomp(string);
765 var = malloc(strlen(child->argv[1])+strlen(string)+2);
766 if(var) {
767 sprintf(var, "%s=%s", child->argv[1], string);
768 res = set_local_var(var, 0);
769 } else
770 res = -1;
771 if (res)
772 fprintf(stderr, "read: %m\n");
773 free(var); /* So not move up to avoid breaking errno */
774 return res;
775 } else {
776 do res=getchar(); while(res!='\n' && res!=EOF);
777 return 0;
778 }
779}
780
781/* built-in 'set VAR=value' handler */
782static int builtin_set(struct child_prog *child)
783{
784 char *temp = child->argv[1];
785 struct variables *e;
786
787 if (temp == NULL)
788 for(e = top_vars; e; e=e->next)
789 printf("%s=%s\n", e->name, e->value);
790 else
791 set_local_var(temp, 0);
792
793 return EXIT_SUCCESS;
794}
795
796
797/* Built-in 'shift' handler */
798static int builtin_shift(struct child_prog *child)
799{
800 int n=1;
801 if (child->argv[1]) {
802 n=atoi(child->argv[1]);
803 }
804 if (n>=0 && n<global_argc) {
805 /* XXX This probably breaks $0 */
806 global_argc -= n;
807 global_argv += n;
808 return EXIT_SUCCESS;
809 } else {
810 return EXIT_FAILURE;
811 }
812}
813
814/* Built-in '.' handler (read-in and execute commands from file) */
815static int builtin_source(struct child_prog *child)
816{
817 FILE *input;
818 int status;
819
820 if (child->argv[1] == NULL)
821 return EXIT_FAILURE;
822
823 /* XXX search through $PATH is missing */
824 input = fopen(child->argv[1], "r");
825 if (!input) {
826 error_msg("Couldn't open file '%s'", child->argv[1]);
827 return EXIT_FAILURE;
828 }
829
830 /* Now run the file */
831 /* XXX argv and argc are broken; need to save old global_argv
832 * (pointer only is OK!) on this stack frame,
833 * set global_argv=child->argv+1, recurse, and restore. */
834 mark_open(fileno(input));
835 status = parse_file_outer(input);
836 mark_closed(fileno(input));
837 fclose(input);
838 return (status);
839}
840
841static int builtin_umask(struct child_prog *child)
842{
843 mode_t new_umask;
844 const char *arg = child->argv[1];
845 char *end;
846 if (arg) {
847 new_umask=strtoul(arg, &end, 8);
848 if (*end!='\0' || end == arg) {
849 return EXIT_FAILURE;
850 }
851 } else {
852 printf("%.3o\n", (unsigned int) (new_umask=umask(0)));
853 }
854 umask(new_umask);
855 return EXIT_SUCCESS;
856}
857
858/* built-in 'unset VAR' handler */
859static int builtin_unset(struct child_prog *child)
860{
861 /* bash returned already true */
862 unset_local_var(child->argv[1]);
863 return EXIT_SUCCESS;
864}
865
866static int builtin_not_written(struct child_prog *child)
867{
868 printf("builtin_%s not written\n",child->argv[0]);
869 return EXIT_FAILURE;
870}
871#endif
872
873static int b_check_space(o_string *o, int len)
874{
875 /* It would be easy to drop a more restrictive policy
876 * in here, such as setting a maximum string length */
877 if (o->length + len > o->maxlen) {
878 char *old_data = o->data;
879 /* assert (data == NULL || o->maxlen != 0); */
880 o->maxlen += max(2*len, B_CHUNK);
881 o->data = realloc(o->data, 1 + o->maxlen);
882 if (o->data == NULL) {
883 free(old_data);
884 }
885 }
886 return o->data == NULL;
887}
888
889static int b_addchr(o_string *o, int ch)
890{
891 debug_printf("b_addchr: %c %d %p\n", ch, o->length, o);
892 if (b_check_space(o, 1)) return B_NOSPAC;
893 o->data[o->length] = ch;
894 o->length++;
895 o->data[o->length] = '\0';
896 return 0;
897}
898
899static void b_reset(o_string *o)
900{
901 o->length = 0;
902 o->nonnull = 0;
903 if (o->data != NULL) *o->data = '\0';
904}
905
906static void b_free(o_string *o)
907{
908 b_reset(o);
d0fb80c3 909 free(o->data);
fe8c2806
WD		 910 o->data = NULL;
911 o->maxlen = 0;
912}
913
914/* My analysis of quoting semantics tells me that state information
915 * is associated with a destination, not a source.
916 */
917static int b_addqchr(o_string *o, int ch, int quote)
918{
919 if (quote && strchr("*?[\\",ch)) {
920 int rc;
921 rc = b_addchr(o, '\\');
922 if (rc) return rc;
923 }
924 return b_addchr(o, ch);
925}
926
c26e454d 927#ifndef __U_BOOT__
fe8c2806
WD		 928static int b_adduint(o_string *o, unsigned int i)
929{
930 int r;
931 char *p = simple_itoa(i);
932 /* no escape checking necessary */
933 do r=b_addchr(o, *p++); while (r==0 && *p);
934 return r;
935}
c26e454d 936#endif
fe8c2806
WD		 937
938static int static_get(struct in_str *i)
939{
d0ff51ba 940 int ch = *i->p++;
fe8c2806
WD		 941 if (ch=='\0') return EOF;
942 return ch;
943}
944
945static int static_peek(struct in_str *i)
946{
947 return *i->p;
948}
949
950#ifndef __U_BOOT__
951static inline void cmdedit_set_initial_prompt(void)
952{
d0fb80c3 953#ifndef CONFIG_FEATURE_SH_FANCY_PROMPT
fe8c2806
WD		 954 PS1 = NULL;
955#else
956 PS1 = getenv("PS1");
957 if(PS1==0)
958 PS1 = "\\w \\$ ";
959#endif
960}
961
962static inline void setup_prompt_string(int promptmode, char **prompt_str)
963{
964 debug_printf("setup_prompt_string %d ",promptmode);
d0fb80c3 965#ifndef CONFIG_FEATURE_SH_FANCY_PROMPT
fe8c2806
WD		 966 /* Set up the prompt */
967 if (promptmode == 1) {
d0fb80c3 968 free(PS1);
fe8c2806
WD		 969 PS1=xmalloc(strlen(cwd)+4);
970 sprintf(PS1, "%s %s", cwd, ( geteuid() != 0 ) ? "$ ":"# ");
971 *prompt_str = PS1;
972 } else {
973 *prompt_str = PS2;
974 }
975#else
976 *prompt_str = (promptmode==1)? PS1 : PS2;
977#endif
978 debug_printf("result %s\n",*prompt_str);
979}
980#endif
981
982static void get_user_input(struct in_str *i)
983{
984#ifndef __U_BOOT__
985 char *prompt_str;
986 static char the_command[BUFSIZ];
987
988 setup_prompt_string(i->promptmode, &prompt_str);
d0fb80c3 989#ifdef CONFIG_FEATURE_COMMAND_EDITING
fe8c2806
WD		 990 /*
991 ** enable command line editing only while a command line
992 ** is actually being read; otherwise, we'll end up bequeathing
993 ** atexit() handlers and other unwanted stuff to our
994 ** child processes (rob@sysgo.de)
995 */
996 cmdedit_read_input(prompt_str, the_command);
997#else
998 fputs(prompt_str, stdout);
999 fflush(stdout);
1000 the_command[0]=fgetc(i->file);
1001 the_command[1]='\0';
1002#endif
1003 fflush(stdout);
1004 i->p = the_command;
1005#else
fe8c2806 1006 int n;
6d0f6bcf 1007 static char the_command[CONFIG_SYS_CBSIZE];
fe8c2806 1008
396387ab 1009#ifdef CONFIG_BOOT_RETRY_TIME
882b7d72 1010# ifndef CONFIG_RESET_TO_RETRY
396387ab
WD		 1011# error "This currently only works with CONFIG_RESET_TO_RETRY enabled"
1012# endif
1013 reset_cmd_timeout();
1014#endif
fe8c2806
WD		 1015 i->__promptme = 1;
1016 if (i->promptmode == 1) {
6d0f6bcf 1017 n = readline(CONFIG_SYS_PROMPT);
fe8c2806 1018 } else {
6d0f6bcf 1019 n = readline(CONFIG_SYS_PROMPT_HUSH_PS2);
fe8c2806 1020 }
396387ab
WD		 1021#ifdef CONFIG_BOOT_RETRY_TIME
1022 if (n == -2) {
1023 puts("\nTimeout waiting for command\n");
1024# ifdef CONFIG_RESET_TO_RETRY
1025 do_reset(NULL, 0, 0, NULL);
1026# else
1027# error "This currently only works with CONFIG_RESET_TO_RETRY enabled"
1028# endif
1029 }
1030#endif
fe8c2806
WD		 1031 if (n == -1 ) {
1032 flag_repeat = 0;
1033 i->__promptme = 0;
1034 }
1035 n = strlen(console_buffer);
1036 console_buffer[n] = '\n';
1037 console_buffer[n+1]= '\0';
1038 if (had_ctrlc()) flag_repeat = 0;
1039 clear_ctrlc();
1040 do_repeat = 0;
1041 if (i->promptmode == 1) {
1042 if (console_buffer[0] == '\n'&& flag_repeat == 0) {
1043 strcpy(the_command,console_buffer);
1044 }
1045 else {
1046 if (console_buffer[0] != '\n') {
1047 strcpy(the_command,console_buffer);
1048 flag_repeat = 1;
1049 }
1050 else {
1051 do_repeat = 1;
1052 }
1053 }
1054 i->p = the_command;
1055 }
1056 else {
8bde7f77
WD		 1057 if (console_buffer[0] != '\n') {
1058 if (strlen(the_command) + strlen(console_buffer)
6d0f6bcf 1059 < CONFIG_SYS_CBSIZE) {
8bde7f77
WD		 1060 n = strlen(the_command);
1061 the_command[n-1] = ' ';
1062 strcpy(&the_command[n],console_buffer);
fe8c2806
WD		 1063 }
1064 else {
1065 the_command[0] = '\n';
1066 the_command[1] = '\0';
1067 flag_repeat = 0;
1068 }
1069 }
1070 if (i->__promptme == 0) {
1071 the_command[0] = '\n';
1072 the_command[1] = '\0';
1073 }
1074 i->p = console_buffer;
1075 }
1076#endif
1077}
1078
1079/* This is the magic location that prints prompts
1080 * and gets data back from the user */
1081static int file_get(struct in_str *i)
1082{
1083 int ch;
1084
1085 ch = 0;
1086 /* If there is data waiting, eat it up */
1087 if (i->p && *i->p) {
d0ff51ba 1088 ch = *i->p++;
fe8c2806
WD		 1089 } else {
1090 /* need to double check i->file because we might be doing something
1091 * more complicated by now, like sourcing or substituting. */
1092#ifndef __U_BOOT__
1093 if (i->__promptme && interactive && i->file == stdin) {
1094 while(! i->p || (interactive && strlen(i->p)==0) ) {
1095#else
1096 while(! i->p || strlen(i->p)==0 ) {
1097#endif
1098 get_user_input(i);
1099 }
1100 i->promptmode=2;
1101#ifndef __U_BOOT__
1102 i->__promptme = 0;
1103#endif
1104 if (i->p && *i->p) {
d0ff51ba 1105 ch = *i->p++;
fe8c2806
WD		 1106 }
1107#ifndef __U_BOOT__
1108 } else {
1109 ch = fgetc(i->file);
1110 }
1111
1112#endif
1113 debug_printf("b_getch: got a %d\n", ch);
1114 }
1115#ifndef __U_BOOT__
1116 if (ch == '\n') i->__promptme=1;
1117#endif
1118 return ch;
1119}
1120
1121/* All the callers guarantee this routine will never be
1122 * used right after a newline, so prompting is not needed.
1123 */
1124static int file_peek(struct in_str *i)
1125{
1126#ifndef __U_BOOT__
1127 if (i->p && *i->p) {
1128#endif
1129 return *i->p;
1130#ifndef __U_BOOT__
1131 } else {
1132 i->peek_buf[0] = fgetc(i->file);
1133 i->peek_buf[1] = '\0';
1134 i->p = i->peek_buf;
1135 debug_printf("b_peek: got a %d\n", *i->p);
1136 return *i->p;
1137 }
1138#endif
1139}
1140
1141#ifndef __U_BOOT__
1142static void setup_file_in_str(struct in_str *i, FILE *f)
1143#else
1144static void setup_file_in_str(struct in_str *i)
1145#endif
1146{
1147 i->peek = file_peek;
1148 i->get = file_get;
1149 i->__promptme=1;
1150 i->promptmode=1;
1151#ifndef __U_BOOT__
1152 i->file = f;
1153#endif
1154 i->p = NULL;
1155}
1156
1157static void setup_string_in_str(struct in_str *i, const char *s)
1158{
1159 i->peek = static_peek;
1160 i->get = static_get;
1161 i->__promptme=1;
1162 i->promptmode=1;
1163 i->p = s;
1164}
1165
1166#ifndef __U_BOOT__
1167static void mark_open(int fd)
1168{
1169 struct close_me *new = xmalloc(sizeof(struct close_me));
1170 new->fd = fd;
1171 new->next = close_me_head;
1172 close_me_head = new;
1173}
1174
1175static void mark_closed(int fd)
1176{
1177 struct close_me *tmp;
1178 if (close_me_head == NULL || close_me_head->fd != fd)
1179 error_msg_and_die("corrupt close_me");
1180 tmp = close_me_head;
1181 close_me_head = close_me_head->next;
1182 free(tmp);
1183}
1184
d0fb80c3 1185static void close_all(void)
fe8c2806
WD		 1186{
1187 struct close_me *c;
1188 for (c=close_me_head; c; c=c->next) {
1189 close(c->fd);
1190 }
1191 close_me_head = NULL;
1192}
1193
1194/* squirrel != NULL means we squirrel away copies of stdin, stdout,
1195 * and stderr if they are redirected. */
1196static int setup_redirects(struct child_prog *prog, int squirrel[])
1197{
1198 int openfd, mode;
1199 struct redir_struct *redir;
1200
1201 for (redir=prog->redirects; redir; redir=redir->next) {
1202 if (redir->dup == -1 && redir->word.gl_pathv == NULL) {
1203 /* something went wrong in the parse. Pretend it didn't happen */
1204 continue;
1205 }
1206 if (redir->dup == -1) {
1207 mode=redir_table[redir->type].mode;
1208 openfd = open(redir->word.gl_pathv[0], mode, 0666);
1209 if (openfd < 0) {
1210 /* this could get lost if stderr has been redirected, but
1211 bash and ash both lose it as well (though zsh doesn't!) */
1212 perror_msg("error opening %s", redir->word.gl_pathv[0]);
1213 return 1;
1214 }
1215 } else {
1216 openfd = redir->dup;
1217 }
1218
1219 if (openfd != redir->fd) {
1220 if (squirrel && redir->fd < 3) {
1221 squirrel[redir->fd] = dup(redir->fd);
1222 }
1223 if (openfd == -3) {
1224 close(openfd);
1225 } else {
1226 dup2(openfd, redir->fd);
1227 if (redir->dup == -1)
1228 close (openfd);
1229 }
1230 }
1231 }
1232 return 0;
1233}
1234
1235static void restore_redirects(int squirrel[])
1236{
1237 int i, fd;
1238 for (i=0; i<3; i++) {
1239 fd = squirrel[i];
1240 if (fd != -1) {
1241 /* No error checking. I sure wouldn't know what
1242 * to do with an error if I found one! */
1243 dup2(fd, i);
1244 close(fd);
1245 }
1246 }
1247}
1248
1249/* never returns */
1250/* XXX no exit() here. If you don't exec, use _exit instead.
1251 * The at_exit handlers apparently confuse the calling process,
1252 * in particular stdin handling. Not sure why? */
1253static void pseudo_exec(struct child_prog *child)
1254{
1255 int i, rcode;
1256 char *p;
1257 struct built_in_command *x;
1258 if (child->argv) {
1259 for (i=0; is_assignment(child->argv[i]); i++) {
1260 debug_printf("pid %d environment modification: %s\n",getpid(),child->argv[i]);
1261 p = insert_var_value(child->argv[i]);
1262 putenv(strdup(p));
1263 if (p != child->argv[i]) free(p);
1264 }
1265 child->argv+=i; /* XXX this hack isn't so horrible, since we are about
8bde7f77
WD		 1266 to exit, and therefore don't need to keep data
1267 structures consistent for free() use. */
fe8c2806
WD		 1268 /* If a variable is assigned in a forest, and nobody listens,
1269 * was it ever really set?
1270 */
1271 if (child->argv[0] == NULL) {
1272 _exit(EXIT_SUCCESS);
1273 }
1274
1275 /*
1276 * Check if the command matches any of the builtins.
1277 * Depending on context, this might be redundant. But it's
1278 * easier to waste a few CPU cycles than it is to figure out
1279 * if this is one of those cases.
1280 */
1281 for (x = bltins; x->cmd; x++) {
1282 if (strcmp(child->argv[0], x->cmd) == 0 ) {
1283 debug_printf("builtin exec %s\n", child->argv[0]);
1284 rcode = x->function(child);
1285 fflush(stdout);
1286 _exit(rcode);
1287 }
1288 }
1289
1290 /* Check if the command matches any busybox internal commands
1291 * ("applets") here.
1292 * FIXME: This feature is not 100% safe, since
1293 * BusyBox is not fully reentrant, so we have no guarantee the things
1294 * from the .bss are still zeroed, or that things from .data are still
1295 * at their defaults. We could exec ourself from /proc/self/exe, but I
1296 * really dislike relying on /proc for things. We could exec ourself
1297 * from global_argv[0], but if we are in a chroot, we may not be able
1298 * to find ourself... */
d0fb80c3 1299#ifdef CONFIG_FEATURE_SH_STANDALONE_SHELL
fe8c2806
WD		 1300 {
1301 int argc_l;
1302 char** argv_l=child->argv;
1303 char *name = child->argv[0];
1304
d0fb80c3 1305#ifdef CONFIG_FEATURE_SH_APPLETS_ALWAYS_WIN
fe8c2806
WD		 1306 /* Following discussions from November 2000 on the busybox mailing
1307 * list, the default configuration, (without
1308 * get_last_path_component()) lets the user force use of an
1309 * external command by specifying the full (with slashes) filename.
d0fb80c3 1310 * If you enable CONFIG_FEATURE_SH_APPLETS_ALWAYS_WIN then applets
fe8c2806
WD		 1311 * _aways_ override external commands, so if you want to run
1312 * /bin/cat, it will use BusyBox cat even if /bin/cat exists on the
1313 * filesystem and is _not_ busybox. Some systems may want this,
1314 * most do not. */
1315 name = get_last_path_component(name);
1316#endif
1317 /* Count argc for use in a second... */
1318 for(argc_l=0;*argv_l!=NULL; argv_l++, argc_l++);
1319 optind = 1;
1320 debug_printf("running applet %s\n", name);
1321 run_applet_by_name(name, argc_l, child->argv);
1322 }
1323#endif
1324 debug_printf("exec of %s\n",child->argv[0]);
1325 execvp(child->argv[0],child->argv);
1326 perror_msg("couldn't exec: %s",child->argv[0]);
1327 _exit(1);
1328 } else if (child->group) {
1329 debug_printf("runtime nesting to group\n");
1330 interactive=0; /* crucial!!!! */
1331 rcode = run_list_real(child->group);
1332 /* OK to leak memory by not calling free_pipe_list,
1333 * since this process is about to exit */
1334 _exit(rcode);
1335 } else {
1336 /* Can happen. See what bash does with ">foo" by itself. */
1337 debug_printf("trying to pseudo_exec null command\n");
1338 _exit(EXIT_SUCCESS);
1339 }
1340}
1341
1342static void insert_bg_job(struct pipe *pi)
1343{
1344 struct pipe *thejob;
1345
1346 /* Linear search for the ID of the job to use */
1347 pi->jobid = 1;
1348 for (thejob = job_list; thejob; thejob = thejob->next)
1349 if (thejob->jobid >= pi->jobid)
1350 pi->jobid = thejob->jobid + 1;
1351
1352 /* add thejob to the list of running jobs */
1353 if (!job_list) {
1354 thejob = job_list = xmalloc(sizeof(*thejob));
1355 } else {
1356 for (thejob = job_list; thejob->next; thejob = thejob->next) /* nothing */;
1357 thejob->next = xmalloc(sizeof(*thejob));
1358 thejob = thejob->next;
1359 }
1360
1361 /* physically copy the struct job */
1362 memcpy(thejob, pi, sizeof(struct pipe));
1363 thejob->next = NULL;
1364 thejob->running_progs = thejob->num_progs;
1365 thejob->stopped_progs = 0;
1366 thejob->text = xmalloc(BUFSIZ); /* cmdedit buffer size */
1367
1368 /*if (pi->progs[0] && pi->progs[0].argv && pi->progs[0].argv[0]) */
1369 {
1370 char *bar=thejob->text;
1371 char **foo=pi->progs[0].argv;
1372 while(foo && *foo) {
1373 bar += sprintf(bar, "%s ", *foo++);
1374 }
1375 }
1376
1377 /* we don't wait for background thejobs to return -- append it
1378 to the list of backgrounded thejobs and leave it alone */
1379 printf("[%d] %d\n", thejob->jobid, thejob->progs[0].pid);
1380 last_bg_pid = thejob->progs[0].pid;
1381 last_jobid = thejob->jobid;
1382}
1383
1384/* remove a backgrounded job */
1385static void remove_bg_job(struct pipe *pi)
1386{
1387 struct pipe *prev_pipe;
1388
1389 if (pi == job_list) {
1390 job_list = pi->next;
1391 } else {
1392 prev_pipe = job_list;
1393 while (prev_pipe->next != pi)
1394 prev_pipe = prev_pipe->next;
1395 prev_pipe->next = pi->next;
1396 }
1397 if (job_list)
1398 last_jobid = job_list->jobid;
1399 else
1400 last_jobid = 0;
1401
1402 pi->stopped_progs = 0;
1403 free_pipe(pi, 0);
1404 free(pi);
1405}
1406
1407/* Checks to see if any processes have exited -- if they
1408 have, figure out why and see if a job has completed */
1409static int checkjobs(struct pipe* fg_pipe)
1410{
1411 int attributes;
1412 int status;
1413 int prognum = 0;
1414 struct pipe *pi;
1415 pid_t childpid;
1416
1417 attributes = WUNTRACED;
1418 if (fg_pipe==NULL) {
1419 attributes |= WNOHANG;
1420 }
1421
1422 while ((childpid = waitpid(-1, &status, attributes)) > 0) {
1423 if (fg_pipe) {
1424 int i, rcode = 0;
1425 for (i=0; i < fg_pipe->num_progs; i++) {
1426 if (fg_pipe->progs[i].pid == childpid) {
1427 if (i==fg_pipe->num_progs-1)
1428 rcode=WEXITSTATUS(status);
1429 (fg_pipe->num_progs)--;
1430 return(rcode);
1431 }
1432 }
1433 }
1434
1435 for (pi = job_list; pi; pi = pi->next) {
1436 prognum = 0;
1437 while (prognum < pi->num_progs && pi->progs[prognum].pid != childpid) {
1438 prognum++;
1439 }
1440 if (prognum < pi->num_progs)
1441 break;
1442 }
1443
1444 if(pi==NULL) {
1445 debug_printf("checkjobs: pid %d was not in our list!\n", childpid);
1446 continue;
1447 }
1448
1449 if (WIFEXITED(status) || WIFSIGNALED(status)) {
1450 /* child exited */
1451 pi->running_progs--;
1452 pi->progs[prognum].pid = 0;
1453
1454 if (!pi->running_progs) {
1455 printf(JOB_STATUS_FORMAT, pi->jobid, "Done", pi->text);
1456 remove_bg_job(pi);
1457 }
1458 } else {
1459 /* child stopped */
1460 pi->stopped_progs++;
1461 pi->progs[prognum].is_stopped = 1;
1462
1463#if 0
1464 /* Printing this stuff is a pain, since it tends to
1465 * overwrite the prompt an inconveinient moments. So
1466 * don't do that. */
1467 if (pi->stopped_progs == pi->num_progs) {
1468 printf("\n"JOB_STATUS_FORMAT, pi->jobid, "Stopped", pi->text);
1469 }
1470#endif
1471 }
1472 }
1473
1474 if (childpid == -1 && errno != ECHILD)
1475 perror_msg("waitpid");
1476
1477 /* move the shell to the foreground */
1478 /*if (interactive && tcsetpgrp(shell_terminal, getpgid(0))) */
1479 /* perror_msg("tcsetpgrp-2"); */
1480 return -1;
1481}
1482
1483/* Figure out our controlling tty, checking in order stderr,
1484 * stdin, and stdout. If check_pgrp is set, also check that
1485 * we belong to the foreground process group associated with
1486 * that tty. The value of shell_terminal is needed in order to call
1487 * tcsetpgrp(shell_terminal, ...); */
1488void controlling_tty(int check_pgrp)
1489{
1490 pid_t curpgrp;
1491
1492 if ((curpgrp = tcgetpgrp(shell_terminal = 2)) < 0
1493 && (curpgrp = tcgetpgrp(shell_terminal = 0)) < 0
1494 && (curpgrp = tcgetpgrp(shell_terminal = 1)) < 0)
1495 goto shell_terminal_error;
1496
1497 if (check_pgrp && curpgrp != getpgid(0))
1498 goto shell_terminal_error;
1499
1500 return;
1501
1502shell_terminal_error:
1503 shell_terminal = -1;
1504 return;
1505}
1506#endif
1507
1508/* run_pipe_real() starts all the jobs, but doesn't wait for anything
1509 * to finish. See checkjobs().
1510 *
1511 * return code is normally -1, when the caller has to wait for children
1512 * to finish to determine the exit status of the pipe. If the pipe
1513 * is a simple builtin command, however, the action is done by the
1514 * time run_pipe_real returns, and the exit code is provided as the
1515 * return value.
1516 *
1517 * The input of the pipe is always stdin, the output is always
1518 * stdout. The outpipe[] mechanism in BusyBox-0.48 lash is bogus,
1519 * because it tries to avoid running the command substitution in
1520 * subshell, when that is in fact necessary. The subshell process
1521 * now has its stdout directed to the input of the appropriate pipe,
1522 * so this routine is noticeably simpler.
1523 */
1524static int run_pipe_real(struct pipe *pi)
1525{
1526 int i;
1527#ifndef __U_BOOT__
1528 int nextin, nextout;
1529 int pipefds[2]; /* pipefds[0] is for reading */
1530 struct child_prog *child;
1531 struct built_in_command *x;
1532 char *p;
d0fb80c3
WD		 1533# if __GNUC__
1534 /* Avoid longjmp clobbering */
1535 (void) &i;
1536 (void) &nextin;
1537 (void) &nextout;
1538 (void) &child;
1539# endif
fe8c2806
WD		 1540#else
1541 int nextin;
1542 int flag = do_repeat ? CMD_FLAG_REPEAT : 0;
1543 struct child_prog *child;
fe8c2806 1544 char *p;
d0fb80c3
WD		 1545# if __GNUC__
1546 /* Avoid longjmp clobbering */
1547 (void) &i;
1548 (void) &nextin;
1549 (void) &child;
1550# endif
1551#endif /* __U_BOOT__ */
fe8c2806
WD		 1552
1553 nextin = 0;
1554#ifndef __U_BOOT__
1555 pi->pgrp = -1;
1556#endif
1557
1558 /* Check if this is a simple builtin (not part of a pipe).
1559 * Builtins within pipes have to fork anyway, and are handled in
1560 * pseudo_exec. "echo foo | read bar" doesn't work on bash, either.
1561 */
1562 if (pi->num_progs == 1) child = & (pi->progs[0]);
1563#ifndef __U_BOOT__
1564 if (pi->num_progs == 1 && child->group && child->subshell == 0) {
1565 int squirrel[] = {-1, -1, -1};
1566 int rcode;
1567 debug_printf("non-subshell grouping\n");
1568 setup_redirects(child, squirrel);
1569 /* XXX could we merge code with following builtin case,
1570 * by creating a pseudo builtin that calls run_list_real? */
1571 rcode = run_list_real(child->group);
1572 restore_redirects(squirrel);
1573#else
1574 if (pi->num_progs == 1 && child->group) {
1575 int rcode;
1576 debug_printf("non-subshell grouping\n");
1577 rcode = run_list_real(child->group);
1578#endif
1579 return rcode;
1580 } else if (pi->num_progs == 1 && pi->progs[0].argv != NULL) {
1581 for (i=0; is_assignment(child->argv[i]); i++) { /* nothing */ }
1582 if (i!=0 && child->argv[i]==NULL) {
1583 /* assignments, but no command: set the local environment */
1584 for (i=0; child->argv[i]!=NULL; i++) {
1585
1586 /* Ok, this case is tricky. We have to decide if this is a
1587 * local variable, or an already exported variable. If it is
1588 * already exported, we have to export the new value. If it is
1589 * not exported, we need only set this as a local variable.
1590 * This junk is all to decide whether or not to export this
1591 * variable. */
1592 int export_me=0;
1593 char *name, *value;
1594 name = xstrdup(child->argv[i]);
1595 debug_printf("Local environment set: %s\n", name);
1596 value = strchr(name, '=');
1597 if (value)
1598 *value=0;
1599#ifndef __U_BOOT__
1600 if ( get_local_var(name)) {
1601 export_me=1;
1602 }
1603#endif
1604 free(name);
1605 p = insert_var_value(child->argv[i]);
1606 set_local_var(p, export_me);
1607 if (p != child->argv[i]) free(p);
1608 }
1609 return EXIT_SUCCESS; /* don't worry about errors in set_local_var() yet */
1610 }
1611 for (i = 0; is_assignment(child->argv[i]); i++) {
1612 p = insert_var_value(child->argv[i]);
1613#ifndef __U_BOOT__
1614 putenv(strdup(p));
1615#else
1616 set_local_var(p, 0);
1617#endif
1618 if (p != child->argv[i]) {
1619 child->sp--;
1620 free(p);
1621 }
1622 }
1623 if (child->sp) {
1624 char * str = NULL;
1625
1626 str = make_string((child->argv + i));
1627 parse_string_outer(str, FLAG_EXIT_FROM_LOOP | FLAG_REPARSING);
1628 free(str);
1629 return last_return_code;
1630 }
1631#ifndef __U_BOOT__
1632 for (x = bltins; x->cmd; x++) {
1633 if (strcmp(child->argv[i], x->cmd) == 0 ) {
1634 int squirrel[] = {-1, -1, -1};
1635 int rcode;
1636 if (x->function == builtin_exec && child->argv[i+1]==NULL) {
1637 debug_printf("magic exec\n");
1638 setup_redirects(child,NULL);
1639 return EXIT_SUCCESS;
1640 }
1641 debug_printf("builtin inline %s\n", child->argv[0]);
1642 /* XXX setup_redirects acts on file descriptors, not FILEs.
1643 * This is perfect for work that comes after exec().
1644 * Is it really safe for inline use? Experimentally,
1645 * things seem to work with glibc. */
1646 setup_redirects(child, squirrel);
7344f912
SG		 1647
1648 child->argv += i; /* XXX horrible hack */
1649 rcode = x->function(child);
1650 /* XXX restore hack so free() can work right */
1651 child->argv -= i;
1652 restore_redirects(squirrel);
1653 }
1654 return rcode;
1655 }
fe8c2806 1656#else
9d12d5d4
SG		 1657 /* check ";", because ,example , argv consist from
1658 * "help;flinfo" must not execute
1659 */
1660 if (strchr(child->argv[i], ';')) {
1661 printf("Unknown command '%s' - try 'help' or use "
1662 "'run' command\n", child->argv[i]);
1663 return -1;
fe8c2806 1664 }
9d12d5d4
SG		 1665 /* Process the command */
1666 return cmd_process(flag, child->argc, child->argv,
1667 &flag_repeat);
1668#endif
fe8c2806 1669 }
9d12d5d4 1670#ifndef __U_BOOT__
fe8c2806
WD		 1671
1672 for (i = 0; i < pi->num_progs; i++) {
1673 child = & (pi->progs[i]);
1674
1675 /* pipes are inserted between pairs of commands */
1676 if ((i + 1) < pi->num_progs) {
1677 if (pipe(pipefds)<0) perror_msg_and_die("pipe");
1678 nextout = pipefds[1];
1679 } else {
1680 nextout=1;
1681 pipefds[0] = -1;
1682 }
1683
1684 /* XXX test for failed fork()? */
1685 if (!(child->pid = fork())) {
1686 /* Set the handling for job control signals back to the default. */
1687 signal(SIGINT, SIG_DFL);
1688 signal(SIGQUIT, SIG_DFL);
1689 signal(SIGTERM, SIG_DFL);
1690 signal(SIGTSTP, SIG_DFL);
1691 signal(SIGTTIN, SIG_DFL);
1692 signal(SIGTTOU, SIG_DFL);
1693 signal(SIGCHLD, SIG_DFL);
1694
1695 close_all();
1696
1697 if (nextin != 0) {
1698 dup2(nextin, 0);
1699 close(nextin);
1700 }
1701 if (nextout != 1) {
1702 dup2(nextout, 1);
1703 close(nextout);
1704 }
1705 if (pipefds[0]!=-1) {
1706 close(pipefds[0]); /* opposite end of our output pipe */
1707 }
1708
1709 /* Like bash, explicit redirects override pipes,
1710 * and the pipe fd is available for dup'ing. */
1711 setup_redirects(child,NULL);
1712
1713 if (interactive && pi->followup!=PIPE_BG) {
1714 /* If we (the child) win the race, put ourselves in the process
1715 * group whose leader is the first process in this pipe. */
1716 if (pi->pgrp < 0) {
1717 pi->pgrp = getpid();
1718 }
1719 if (setpgid(0, pi->pgrp) == 0) {
1720 tcsetpgrp(2, pi->pgrp);
1721 }
1722 }
1723
1724 pseudo_exec(child);
1725 }
1726
1727
1728 /* put our child in the process group whose leader is the
1729 first process in this pipe */
1730 if (pi->pgrp < 0) {
1731 pi->pgrp = child->pid;
1732 }
1733 /* Don't check for errors. The child may be dead already,
1734 * in which case setpgid returns error code EACCES. */
1735 setpgid(child->pid, pi->pgrp);
1736
1737 if (nextin != 0)
1738 close(nextin);
1739 if (nextout != 1)
1740 close(nextout);
1741
1742 /* If there isn't another process, nextin is garbage
1743 but it doesn't matter */
1744 nextin = pipefds[0];
1745 }
1746#endif
1747 return -1;
1748}
1749
1750static int run_list_real(struct pipe *pi)
1751{
1752 char *save_name = NULL;
1753 char **list = NULL;
1754 char **save_list = NULL;
1755 struct pipe *rpipe;
1756 int flag_rep = 0;
1757#ifndef __U_BOOT__
1758 int save_num_progs;
1759#endif
1760 int rcode=0, flag_skip=1;
1761 int flag_restore = 0;
1762 int if_code=0, next_if_code=0; /* need double-buffer to handle elif */
1763 reserved_style rmode, skip_more_in_this_rmode=RES_XXXX;
1764 /* check syntax for "for" */
1765 for (rpipe = pi; rpipe; rpipe = rpipe->next) {
1766 if ((rpipe->r_mode == RES_IN ||
1767 rpipe->r_mode == RES_FOR) &&
1768 (rpipe->next == NULL)) {
1769 syntax();
1770#ifdef __U_BOOT__
1771 flag_repeat = 0;
1772#endif
1773 return 1;
1774 }
1775 if ((rpipe->r_mode == RES_IN &&
1776 (rpipe->next->r_mode == RES_IN &&
1777 rpipe->next->progs->argv != NULL))||
1778 (rpipe->r_mode == RES_FOR &&
1779 rpipe->next->r_mode != RES_IN)) {
1780 syntax();
1781#ifdef __U_BOOT__
1782 flag_repeat = 0;
1783#endif
1784 return 1;
1785 }
1786 }
1787 for (; pi; pi = (flag_restore != 0) ? rpipe : pi->next) {
1788 if (pi->r_mode == RES_WHILE || pi->r_mode == RES_UNTIL ||
1789 pi->r_mode == RES_FOR) {
1790#ifdef __U_BOOT__
1791 /* check Ctrl-C */
1792 ctrlc();
1793 if ((had_ctrlc())) {
1794 return 1;
1795 }
1796#endif
1797 flag_restore = 0;
1798 if (!rpipe) {
1799 flag_rep = 0;
1800 rpipe = pi;
1801 }
1802 }
1803 rmode = pi->r_mode;
1804 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);
1805 if (rmode == skip_more_in_this_rmode && flag_skip) {
1806 if (pi->followup == PIPE_SEQ) flag_skip=0;
1807 continue;
1808 }
1809 flag_skip = 1;
1810 skip_more_in_this_rmode = RES_XXXX;
1811 if (rmode == RES_THEN || rmode == RES_ELSE) if_code = next_if_code;
1812 if (rmode == RES_THEN && if_code) continue;
1813 if (rmode == RES_ELSE && !if_code) continue;
56b86bf0 1814 if (rmode == RES_ELIF && !if_code) break;
fe8c2806
WD		 1815 if (rmode == RES_FOR && pi->num_progs) {
1816 if (!list) {
1817 /* if no variable values after "in" we skip "for" */
1818 if (!pi->next->progs->argv) continue;
1819 /* create list of variable values */
1820 list = make_list_in(pi->next->progs->argv,
1821 pi->progs->argv[0]);
1822 save_list = list;
1823 save_name = pi->progs->argv[0];
1824 pi->progs->argv[0] = NULL;
1825 flag_rep = 1;
1826 }
1827 if (!(*list)) {
1828 free(pi->progs->argv[0]);
1829 free(save_list);
1830 list = NULL;
1831 flag_rep = 0;
1832 pi->progs->argv[0] = save_name;
1833#ifndef __U_BOOT__
1834 pi->progs->glob_result.gl_pathv[0] =
1835 pi->progs->argv[0];
1836#endif
1837 continue;
1838 } else {
1839 /* insert new value from list for variable */
1840 if (pi->progs->argv[0])
1841 free(pi->progs->argv[0]);
1842 pi->progs->argv[0] = *list++;
1843#ifndef __U_BOOT__
1844 pi->progs->glob_result.gl_pathv[0] =
1845 pi->progs->argv[0];
1846#endif
1847 }
1848 }
1849 if (rmode == RES_IN) continue;
1850 if (rmode == RES_DO) {
1851 if (!flag_rep) continue;
1852 }
1853 if ((rmode == RES_DONE)) {
1854 if (flag_rep) {
1855 flag_restore = 1;
1856 } else {
1857 rpipe = NULL;
1858 }
1859 }
1860 if (pi->num_progs == 0) continue;
1861#ifndef __U_BOOT__
1862 save_num_progs = pi->num_progs; /* save number of programs */
1863#endif
1864 rcode = run_pipe_real(pi);
1865 debug_printf("run_pipe_real returned %d\n",rcode);
1866#ifndef __U_BOOT__
1867 if (rcode!=-1) {
1868 /* We only ran a builtin: rcode was set by the return value
1869 * of run_pipe_real(), and we don't need to wait for anything. */
1870 } else if (pi->followup==PIPE_BG) {
1871 /* XXX check bash's behavior with nontrivial pipes */
1872 /* XXX compute jobid */
1873 /* XXX what does bash do with attempts to background builtins? */
1874 insert_bg_job(pi);
1875 rcode = EXIT_SUCCESS;
1876 } else {
1877 if (interactive) {
1878 /* move the new process group into the foreground */
1879 if (tcsetpgrp(shell_terminal, pi->pgrp) && errno != ENOTTY)
1880 perror_msg("tcsetpgrp-3");
1881 rcode = checkjobs(pi);
1882 /* move the shell to the foreground */
1883 if (tcsetpgrp(shell_terminal, getpgid(0)) && errno != ENOTTY)
1884 perror_msg("tcsetpgrp-4");
1885 } else {
1886 rcode = checkjobs(pi);
1887 }
1888 debug_printf("checkjobs returned %d\n",rcode);
1889 }
1890 last_return_code=rcode;
1891#else
c26e454d
WD		 1892 if (rcode < -1) {
1893 last_return_code = -rcode - 2;
1894 return -2; /* exit */
1895 }
fe8c2806
WD		 1896 last_return_code=(rcode == 0) ? 0 : 1;
1897#endif
1898#ifndef __U_BOOT__
1899 pi->num_progs = save_num_progs; /* restore number of programs */
1900#endif
1901 if ( rmode == RES_IF || rmode == RES_ELIF )
1902 next_if_code=rcode; /* can be overwritten a number of times */
1903 if (rmode == RES_WHILE)
1904 flag_rep = !last_return_code;
1905 if (rmode == RES_UNTIL)
1906 flag_rep = last_return_code;
1907 if ( (rcode==EXIT_SUCCESS && pi->followup==PIPE_OR) ||
1908 (rcode!=EXIT_SUCCESS && pi->followup==PIPE_AND) )
1909 skip_more_in_this_rmode=rmode;
1910#ifndef __U_BOOT__
1911 checkjobs(NULL);
1912#endif
1913 }
1914 return rcode;
1915}
1916
1917/* broken, of course, but OK for testing */
1918static char *indenter(int i)
1919{
1920 static char blanks[]=" ";
1921 return &blanks[sizeof(blanks)-i-1];
1922}
1923
1924/* return code is the exit status of the pipe */
1925static int free_pipe(struct pipe *pi, int indent)
1926{
1927 char **p;
1928 struct child_prog *child;
1929#ifndef __U_BOOT__
1930 struct redir_struct *r, *rnext;
1931#endif
1932 int a, i, ret_code=0;
1933 char *ind = indenter(indent);
1934
1935#ifndef __U_BOOT__
1936 if (pi->stopped_progs > 0)
1937 return ret_code;
1938 final_printf("%s run pipe: (pid %d)\n",ind,getpid());
1939#endif
1940 for (i=0; i<pi->num_progs; i++) {
1941 child = &pi->progs[i];
1942 final_printf("%s command %d:\n",ind,i);
1943 if (child->argv) {
1944 for (a=0,p=child->argv; *p; a++,p++) {
1945 final_printf("%s argv[%d] = %s\n",ind,a,*p);
1946 }
1947#ifndef __U_BOOT__
1948 globfree(&child->glob_result);
1949#else
197324d7 1950 for (a = 0; a < child->argc; a++) {
8bde7f77
WD		 1951 free(child->argv[a]);
1952 }
fe8c2806 1953 free(child->argv);
8bde7f77 1954 child->argc = 0;
fe8c2806
WD		 1955#endif
1956 child->argv=NULL;
1957 } else if (child->group) {
1958#ifndef __U_BOOT__
1959 final_printf("%s begin group (subshell:%d)\n",ind, child->subshell);
1960#endif
1961 ret_code = free_pipe_list(child->group,indent+3);
1962 final_printf("%s end group\n",ind);
1963 } else {
1964 final_printf("%s (nil)\n",ind);
1965 }
1966#ifndef __U_BOOT__
1967 for (r=child->redirects; r; r=rnext) {
1968 final_printf("%s redirect %d%s", ind, r->fd, redir_table[r->type].descrip);
1969 if (r->dup == -1) {
1970 /* guard against the case >$FOO, where foo is unset or blank */
1971 if (r->word.gl_pathv) {
1972 final_printf(" %s\n", *r->word.gl_pathv);
1973 globfree(&r->word);
1974 }
1975 } else {
1976 final_printf("&%d\n", r->dup);
1977 }
1978 rnext=r->next;
1979 free(r);
1980 }
1981 child->redirects=NULL;
1982#endif
1983 }
1984 free(pi->progs); /* children are an array, they get freed all at once */
1985 pi->progs=NULL;
1986 return ret_code;
1987}
1988
1989static int free_pipe_list(struct pipe *head, int indent)
1990{
1991 int rcode=0; /* if list has no members */
1992 struct pipe *pi, *next;
1993 char *ind = indenter(indent);
1994 for (pi=head; pi; pi=next) {
1995 final_printf("%s pipe reserved mode %d\n", ind, pi->r_mode);
1996 rcode = free_pipe(pi, indent);
1997 final_printf("%s pipe followup code %d\n", ind, pi->followup);
1998 next=pi->next;
1999 pi->next=NULL;
2000 free(pi);
2001 }
2002 return rcode;
2003}
2004
2005/* Select which version we will use */
2006static int run_list(struct pipe *pi)
2007{
2008 int rcode=0;
2009#ifndef __U_BOOT__
2010 if (fake_mode==0) {
2011#endif
2012 rcode = run_list_real(pi);
2013#ifndef __U_BOOT__
2014 }
2015#endif
2016 /* free_pipe_list has the side effect of clearing memory
2017 * In the long run that function can be merged with run_list_real,
2018 * but doing that now would hobble the debugging effort. */
2019 free_pipe_list(pi,0);
2020 return rcode;
2021}
2022
2023/* The API for glob is arguably broken. This routine pushes a non-matching
2024 * string into the output structure, removing non-backslashed backslashes.
2025 * If someone can prove me wrong, by performing this function within the
2026 * original glob(3) api, feel free to rewrite this routine into oblivion.
2027 * Return code (0 vs. GLOB_NOSPACE) matches glob(3).
2028 * XXX broken if the last character is '\\', check that before calling.
2029 */
2030#ifndef __U_BOOT__
2031static int globhack(const char *src, int flags, glob_t *pglob)
2032{
2033 int cnt=0, pathc;
2034 const char *s;
2035 char *dest;
2036 for (cnt=1, s=src; s && *s; s++) {
2037 if (*s == '\\') s++;
2038 cnt++;
2039 }
2040 dest = malloc(cnt);
2041 if (!dest) return GLOB_NOSPACE;
2042 if (!(flags & GLOB_APPEND)) {
2043 pglob->gl_pathv=NULL;
2044 pglob->gl_pathc=0;
2045 pglob->gl_offs=0;
2046 pglob->gl_offs=0;
2047 }
2048 pathc = ++pglob->gl_pathc;
2049 pglob->gl_pathv = realloc(pglob->gl_pathv, (pathc+1)*sizeof(*pglob->gl_pathv));
2050 if (pglob->gl_pathv == NULL) return GLOB_NOSPACE;
2051 pglob->gl_pathv[pathc-1]=dest;
2052 pglob->gl_pathv[pathc]=NULL;
2053 for (s=src; s && *s; s++, dest++) {
2054 if (*s == '\\') s++;
2055 *dest = *s;
2056 }
2057 *dest='\0';
2058 return 0;
2059}
2060
2061/* XXX broken if the last character is '\\', check that before calling */
2062static int glob_needed(const char *s)
2063{
2064 for (; *s; s++) {
2065 if (*s == '\\') s++;
2066 if (strchr("*[?",*s)) return 1;
2067 }
2068 return 0;
2069}
2070
2071#if 0
2072static void globprint(glob_t *pglob)
2073{
2074 int i;
2075 debug_printf("glob_t at %p:\n", pglob);
2076 debug_printf(" gl_pathc=%d gl_pathv=%p gl_offs=%d gl_flags=%d\n",
2077 pglob->gl_pathc, pglob->gl_pathv, pglob->gl_offs, pglob->gl_flags);
2078 for (i=0; i<pglob->gl_pathc; i++)
2079 debug_printf("pglob->gl_pathv[%d] = %p = %s\n", i,
2080 pglob->gl_pathv[i], pglob->gl_pathv[i]);
2081}
2082#endif
2083
2084static int xglob(o_string *dest, int flags, glob_t *pglob)
2085{
2086 int gr;
2087
8bde7f77 2088 /* short-circuit for null word */
fe8c2806 2089 /* we can code this better when the debug_printf's are gone */
8bde7f77
WD		 2090 if (dest->length == 0) {
2091 if (dest->nonnull) {
2092 /* bash man page calls this an "explicit" null */
2093 gr = globhack(dest->data, flags, pglob);
2094 debug_printf("globhack returned %d\n",gr);
2095 } else {
fe8c2806
WD		 2096 return 0;
2097 }
8bde7f77 2098 } else if (glob_needed(dest->data)) {
fe8c2806
WD		 2099 gr = glob(dest->data, flags, NULL, pglob);
2100 debug_printf("glob returned %d\n",gr);
2101 if (gr == GLOB_NOMATCH) {
2102 /* quote removal, or more accurately, backslash removal */
2103 gr = globhack(dest->data, flags, pglob);
2104 debug_printf("globhack returned %d\n",gr);
2105 }
2106 } else {
2107 gr = globhack(dest->data, flags, pglob);
2108 debug_printf("globhack returned %d\n",gr);
2109 }
2110 if (gr == GLOB_NOSPACE)
2111 error_msg_and_die("out of memory during glob");
2112 if (gr != 0) { /* GLOB_ABORTED ? */
2113 error_msg("glob(3) error %d",gr);
2114 }
2115 /* globprint(glob_target); */
2116 return gr;
2117}
2118#endif
2119
c26e454d
WD		 2120#ifdef __U_BOOT__
2121static char *get_dollar_var(char ch);
2122#endif
2123
fe8c2806 2124/* This is used to get/check local shell variables */
eae3b064 2125char *get_local_var(const char *s)
fe8c2806
WD		 2126{
2127 struct variables *cur;
2128
2129 if (!s)
2130 return NULL;
c26e454d
WD		 2131
2132#ifdef __U_BOOT__
2133 if (*s == '$')
2134 return get_dollar_var(s[1]);
2135#endif
2136
fe8c2806
WD		 2137 for (cur = top_vars; cur; cur=cur->next)
2138 if(strcmp(cur->name, s)==0)
2139 return cur->value;
2140 return NULL;
2141}
2142
2143/* This is used to set local shell variables
2144 flg_export==0 if only local (not exporting) variable
2145 flg_export==1 if "new" exporting environ
2146 flg_export>1 if current startup environ (not call putenv()) */
81473f67 2147int set_local_var(const char *s, int flg_export)
fe8c2806
WD		 2148{
2149 char *name, *value;
2150 int result=0;
2151 struct variables *cur;
2152
c26e454d
WD		 2153#ifdef __U_BOOT__
2154 /* might be possible! */
2155 if (!isalpha(*s))
2156 return -1;
2157#endif
2158
fe8c2806
WD		 2159 name=strdup(s);
2160
2161#ifdef __U_BOOT__
2162 if (getenv(name) != NULL) {
2163 printf ("ERROR: "
2d1a537d 2164 "There is a global environment variable with the same name.\n");
c26e454d 2165 free(name);
fe8c2806
WD		 2166 return -1;
2167 }
2168#endif
2169 /* Assume when we enter this function that we are already in
2170 * NAME=VALUE format. So the first order of business is to
2171 * split 's' on the '=' into 'name' and 'value' */
2172 value = strchr(name, '=');
2173 if (value==0 && ++value==0) {
2174 free(name);
2175 return -1;
2176 }
2177 *value++ = 0;
2178
2179 for(cur = top_vars; cur; cur = cur->next) {
2180 if(strcmp(cur->name, name)==0)
2181 break;
2182 }
2183
2184 if(cur) {
2185 if(strcmp(cur->value, value)==0) {
2186 if(flg_export>0 && cur->flg_export==0)
2187 cur->flg_export=flg_export;
2188 else
2189 result++;
2190 } else {
2191 if(cur->flg_read_only) {
2192 error_msg("%s: readonly variable", name);
2193 result = -1;
2194 } else {
2195 if(flg_export>0 || cur->flg_export>1)
2196 cur->flg_export=1;
2197 free(cur->value);
2198
2199 cur->value = strdup(value);
2200 }
2201 }
2202 } else {
2203 cur = malloc(sizeof(struct variables));
2204 if(!cur) {
2205 result = -1;
2206 } else {
2207 cur->name = strdup(name);
2208 if(cur->name == 0) {
2209 free(cur);
2210 result = -1;
2211 } else {
2212 struct variables *bottom = top_vars;
2213 cur->value = strdup(value);
2214 cur->next = 0;
2215 cur->flg_export = flg_export;
2216 cur->flg_read_only = 0;
2217 while(bottom->next) bottom=bottom->next;
2218 bottom->next = cur;
2219 }
2220 }
2221 }
2222
2223#ifndef __U_BOOT__
2224 if(result==0 && cur->flg_export==1) {
2225 *(value-1) = '=';
2226 result = putenv(name);
2227 } else {
2228#endif
2229 free(name);
2230#ifndef __U_BOOT__
2231 if(result>0) /* equivalent to previous set */
2232 result = 0;
2233 }
2234#endif
2235 return result;
2236}
2237
81473f67 2238void unset_local_var(const char *name)
fe8c2806
WD		 2239{
2240 struct variables *cur;
2241
2242 if (name) {
2243 for (cur = top_vars; cur; cur=cur->next) {
2244 if(strcmp(cur->name, name)==0)
2245 break;
2246 }
2247 if(cur!=0) {
2248 struct variables *next = top_vars;
2249 if(cur->flg_read_only) {
2250 error_msg("%s: readonly variable", name);
2251 return;
2252 } else {
81473f67 2253#ifndef __U_BOOT__
fe8c2806
WD		 2254 if(cur->flg_export)
2255 unsetenv(cur->name);
81473f67 2256#endif
fe8c2806
WD		 2257 free(cur->name);
2258 free(cur->value);
2259 while (next->next != cur)
2260 next = next->next;
2261 next->next = cur->next;
2262 }
2263 free(cur);
2264 }
2265 }
2266}
fe8c2806
WD		 2267
2268static int is_assignment(const char *s)
2269{
c26e454d
WD		 2270 if (s == NULL)
2271 return 0;
2272
2273 if (!isalpha(*s)) return 0;
fe8c2806
WD		 2274 ++s;
2275 while(isalnum(*s) || *s=='_') ++s;
2276 return *s=='=';
2277}
2278
2279#ifndef __U_BOOT__
2280/* the src parameter allows us to peek forward to a possible &n syntax
2281 * for file descriptor duplication, e.g., "2>&1".
2282 * Return code is 0 normally, 1 if a syntax error is detected in src.
2283 * Resource errors (in xmalloc) cause the process to exit */
2284static int setup_redirect(struct p_context *ctx, int fd, redir_type style,
2285 struct in_str *input)
2286{
2287 struct child_prog *child=ctx->child;
2288 struct redir_struct *redir = child->redirects;
2289 struct redir_struct *last_redir=NULL;
2290
2291 /* Create a new redir_struct and drop it onto the end of the linked list */
2292 while(redir) {
2293 last_redir=redir;
2294 redir=redir->next;
2295 }
2296 redir = xmalloc(sizeof(struct redir_struct));
2297 redir->next=NULL;
2298 redir->word.gl_pathv=NULL;
2299 if (last_redir) {
2300 last_redir->next=redir;
2301 } else {
2302 child->redirects=redir;
2303 }
2304
2305 redir->type=style;
2306 redir->fd= (fd==-1) ? redir_table[style].default_fd : fd ;
2307
2308 debug_printf("Redirect type %d%s\n", redir->fd, redir_table[style].descrip);
2309
2310 /* Check for a '2>&1' type redirect */
2311 redir->dup = redirect_dup_num(input);
2312 if (redir->dup == -2) return 1; /* syntax error */
2313 if (redir->dup != -1) {
2314 /* Erik had a check here that the file descriptor in question
2315 * is legit; I postpone that to "run time"
2316 * A "-" representation of "close me" shows up as a -3 here */
2317 debug_printf("Duplicating redirect '%d>&%d'\n", redir->fd, redir->dup);
2318 } else {
2319 /* We do _not_ try to open the file that src points to,
2320 * since we need to return and let src be expanded first.
2321 * Set ctx->pending_redirect, so we know what to do at the
2322 * end of the next parsed word.
2323 */
2324 ctx->pending_redirect = redir;
2325 }
2326 return 0;
2327}
2328#endif
2329
2330struct pipe *new_pipe(void) {
2331 struct pipe *pi;
2332 pi = xmalloc(sizeof(struct pipe));
2333 pi->num_progs = 0;
2334 pi->progs = NULL;
2335 pi->next = NULL;
2336 pi->followup = 0; /* invalid */
e98f68be 2337 pi->r_mode = RES_NONE;
fe8c2806
WD		 2338 return pi;
2339}
2340
2341static void initialize_context(struct p_context *ctx)
2342{
2343 ctx->pipe=NULL;
2344#ifndef __U_BOOT__
2345 ctx->pending_redirect=NULL;
2346#endif
2347 ctx->child=NULL;
2348 ctx->list_head=new_pipe();
2349 ctx->pipe=ctx->list_head;
2350 ctx->w=RES_NONE;
2351 ctx->stack=NULL;
2352#ifdef __U_BOOT__
2353 ctx->old_flag=0;
2354#endif
2355 done_command(ctx); /* creates the memory for working child */
2356}
2357
2358/* normal return is 0
2359 * if a reserved word is found, and processed, return 1
2360 * should handle if, then, elif, else, fi, for, while, until, do, done.
2361 * case, function, and select are obnoxious, save those for later.
2362 */
3e38691e
WD		 2363struct reserved_combo {
2364 char *literal;
2365 int code;
2366 long flag;
2367};
2368/* Mostly a list of accepted follow-up reserved words.
2369 * FLAG_END means we are done with the sequence, and are ready
2370 * to turn the compound list into a command.
2371 * FLAG_START means the word must start a new compound list.
2372 */
2373static struct reserved_combo reserved_list[] = {
2374 { "if", RES_IF, FLAG_THEN | FLAG_START },
2375 { "then", RES_THEN, FLAG_ELIF | FLAG_ELSE | FLAG_FI },
2376 { "elif", RES_ELIF, FLAG_THEN },
2377 { "else", RES_ELSE, FLAG_FI },
2378 { "fi", RES_FI, FLAG_END },
2379 { "for", RES_FOR, FLAG_IN | FLAG_START },
2380 { "while", RES_WHILE, FLAG_DO | FLAG_START },
2381 { "until", RES_UNTIL, FLAG_DO | FLAG_START },
2382 { "in", RES_IN, FLAG_DO },
2383 { "do", RES_DO, FLAG_DONE },
2384 { "done", RES_DONE, FLAG_END }
2385};
2386#define NRES (sizeof(reserved_list)/sizeof(struct reserved_combo))
2387
fe8c2806
WD		 2388int reserved_word(o_string *dest, struct p_context *ctx)
2389{
fe8c2806
WD		 2390 struct reserved_combo *r;
2391 for (r=reserved_list;
fe8c2806
WD		 2392 r<reserved_list+NRES; r++) {
2393 if (strcmp(dest->data, r->literal) == 0) {
2394 debug_printf("found reserved word %s, code %d\n",r->literal,r->code);
2395 if (r->flag & FLAG_START) {
2396 struct p_context *new = xmalloc(sizeof(struct p_context));
2397 debug_printf("push stack\n");
2398 if (ctx->w == RES_IN || ctx->w == RES_FOR) {
2399 syntax();
2400 free(new);
2401 ctx->w = RES_SNTX;
2402 b_reset(dest);
2403 return 1;
2404 }
2405 *new = *ctx; /* physical copy */
2406 initialize_context(ctx);
2407 ctx->stack=new;
2408 } else if ( ctx->w == RES_NONE || ! (ctx->old_flag & (1<<r->code))) {
2409 syntax();
2410 ctx->w = RES_SNTX;
2411 b_reset(dest);
2412 return 1;
2413 }
2414 ctx->w=r->code;
2415 ctx->old_flag = r->flag;
2416 if (ctx->old_flag & FLAG_END) {
2417 struct p_context *old;
2418 debug_printf("pop stack\n");
2419 done_pipe(ctx,PIPE_SEQ);
2420 old = ctx->stack;
2421 old->child->group = ctx->list_head;
2422#ifndef __U_BOOT__
2423 old->child->subshell = 0;
2424#endif
2425 *ctx = *old; /* physical copy */
2426 free(old);
2427 }
2428 b_reset (dest);
2429 return 1;
2430 }
2431 }
2432 return 0;
2433}
2434
2435/* normal return is 0.
2436 * Syntax or xglob errors return 1. */
2437static int done_word(o_string *dest, struct p_context *ctx)
2438{
2439 struct child_prog *child=ctx->child;
2440#ifndef __U_BOOT__
2441 glob_t *glob_target;
2442 int gr, flags = 0;
2443#else
2444 char *str, *s;
2445 int argc, cnt;
2446#endif
2447
2448 debug_printf("done_word: %s %p\n", dest->data, child);
2449 if (dest->length == 0 && !dest->nonnull) {
2450 debug_printf(" true null, ignored\n");
2451 return 0;
2452 }
2453#ifndef __U_BOOT__
2454 if (ctx->pending_redirect) {
2455 glob_target = &ctx->pending_redirect->word;
2456 } else {
2457#endif
2458 if (child->group) {
2459 syntax();
2460 return 1; /* syntax error, groups and arglists don't mix */
2461 }
2462 if (!child->argv && (ctx->type & FLAG_PARSE_SEMICOLON)) {
2463 debug_printf("checking %s for reserved-ness\n",dest->data);
2464 if (reserved_word(dest,ctx)) return ctx->w==RES_SNTX;
2465 }
2466#ifndef __U_BOOT__
2467 glob_target = &child->glob_result;
8bde7f77 2468 if (child->argv) flags |= GLOB_APPEND;
fe8c2806
WD		 2469#else
2470 for (cnt = 1, s = dest->data; s && *s; s++) {
2471 if (*s == '\\') s++;
2472 cnt++;
2473 }
2474 str = malloc(cnt);
2475 if (!str) return 1;
2476 if ( child->argv == NULL) {
2477 child->argc=0;
2478 }
2479 argc = ++child->argc;
2480 child->argv = realloc(child->argv, (argc+1)*sizeof(*child->argv));
2481 if (child->argv == NULL) return 1;
2482 child->argv[argc-1]=str;
2483 child->argv[argc]=NULL;
2484 for (s = dest->data; s && *s; s++,str++) {
2485 if (*s == '\\') s++;
2486 *str = *s;
2487 }
2488 *str = '\0';
2489#endif
2490#ifndef __U_BOOT__
2491 }
2492 gr = xglob(dest, flags, glob_target);
2493 if (gr != 0) return 1;
2494#endif
2495
2496 b_reset(dest);
2497#ifndef __U_BOOT__
2498 if (ctx->pending_redirect) {
2499 ctx->pending_redirect=NULL;
2500 if (glob_target->gl_pathc != 1) {
2501 error_msg("ambiguous redirect");
2502 return 1;
2503 }
2504 } else {
2505 child->argv = glob_target->gl_pathv;
2506 }
2507#endif
2508 if (ctx->w == RES_FOR) {
2509 done_word(dest,ctx);
2510 done_pipe(ctx,PIPE_SEQ);
2511 }
2512 return 0;
2513}
2514
2515/* The only possible error here is out of memory, in which case
2516 * xmalloc exits. */
2517static int done_command(struct p_context *ctx)
2518{
2519 /* The child is really already in the pipe structure, so
2520 * advance the pipe counter and make a new, null child.
2521 * Only real trickiness here is that the uncommitted
2522 * child structure, to which ctx->child points, is not
2523 * counted in pi->num_progs. */
2524 struct pipe *pi=ctx->pipe;
2525 struct child_prog *prog=ctx->child;
2526
2527 if (prog && prog->group == NULL
8bde7f77 2528 && prog->argv == NULL
fe8c2806 2529#ifndef __U_BOOT__
8bde7f77 2530 && prog->redirects == NULL) {
fe8c2806
WD		 2531#else
2532 ) {
2533#endif
2534 debug_printf("done_command: skipping null command\n");
2535 return 0;
2536 } else if (prog) {
2537 pi->num_progs++;
2538 debug_printf("done_command: num_progs incremented to %d\n",pi->num_progs);
2539 } else {
2540 debug_printf("done_command: initializing\n");
2541 }
2542 pi->progs = xrealloc(pi->progs, sizeof(*pi->progs) * (pi->num_progs+1));
2543
2544 prog = pi->progs + pi->num_progs;
2545#ifndef __U_BOOT__
2546 prog->redirects = NULL;
2547#endif
2548 prog->argv = NULL;
2549#ifndef __U_BOOT__
2550 prog->is_stopped = 0;
2551#endif
2552 prog->group = NULL;
2553#ifndef __U_BOOT__
2554 prog->glob_result.gl_pathv = NULL;
2555 prog->family = pi;
2556#endif
2557 prog->sp = 0;
2558 ctx->child = prog;
2559 prog->type = ctx->type;
2560
2561 /* but ctx->pipe and ctx->list_head remain unchanged */
2562 return 0;
2563}
2564
2565static int done_pipe(struct p_context *ctx, pipe_style type)
2566{
2567 struct pipe *new_p;
2568 done_command(ctx); /* implicit closure of previous command */
2569 debug_printf("done_pipe, type %d\n", type);
2570 ctx->pipe->followup = type;
2571 ctx->pipe->r_mode = ctx->w;
2572 new_p=new_pipe();
2573 ctx->pipe->next = new_p;
2574 ctx->pipe = new_p;
2575 ctx->child = NULL;
2576 done_command(ctx); /* set up new pipe to accept commands */
2577 return 0;
2578}
2579
2580#ifndef __U_BOOT__
2581/* peek ahead in the in_str to find out if we have a "&n" construct,
2582 * as in "2>&1", that represents duplicating a file descriptor.
2583 * returns either -2 (syntax error), -1 (no &), or the number found.
2584 */
2585static int redirect_dup_num(struct in_str *input)
2586{
2587 int ch, d=0, ok=0;
2588 ch = b_peek(input);
2589 if (ch != '&') return -1;
2590
2591 b_getch(input); /* get the & */
2592 ch=b_peek(input);
2593 if (ch == '-') {
2594 b_getch(input);
2595 return -3; /* "-" represents "close me" */
2596 }
2597 while (isdigit(ch)) {
2598 d = d*10+(ch-'0');
2599 ok=1;
2600 b_getch(input);
2601 ch = b_peek(input);
2602 }
2603 if (ok) return d;
2604
2605 error_msg("ambiguous redirect");
2606 return -2;
2607}
2608
2609/* If a redirect is immediately preceded by a number, that number is
2610 * supposed to tell which file descriptor to redirect. This routine
2611 * looks for such preceding numbers. In an ideal world this routine
2612 * needs to handle all the following classes of redirects...
2613 * echo 2>foo # redirects fd 2 to file "foo", nothing passed to echo
2614 * echo 49>foo # redirects fd 49 to file "foo", nothing passed to echo
2615 * echo -2>foo # redirects fd 1 to file "foo", "-2" passed to echo
2616 * echo 49x>foo # redirects fd 1 to file "foo", "49x" passed to echo
2617 * A -1 output from this program means no valid number was found, so the
2618 * caller should use the appropriate default for this redirection.
2619 */
2620static int redirect_opt_num(o_string *o)
2621{
2622 int num;
2623
2624 if (o->length==0) return -1;
2625 for(num=0; num<o->length; num++) {
2626 if (!isdigit(*(o->data+num))) {
2627 return -1;
2628 }
2629 }
2630 /* reuse num (and save an int) */
2631 num=atoi(o->data);
2632 b_reset(o);
2633 return num;
2634}
2635
2636FILE *generate_stream_from_list(struct pipe *head)
2637{
2638 FILE *pf;
2639#if 1
2640 int pid, channel[2];
2641 if (pipe(channel)<0) perror_msg_and_die("pipe");
2642 pid=fork();
2643 if (pid<0) {
2644 perror_msg_and_die("fork");
2645 } else if (pid==0) {
2646 close(channel[0]);
2647 if (channel[1] != 1) {
2648 dup2(channel[1],1);
2649 close(channel[1]);
2650 }
2651#if 0
2652#define SURROGATE "surrogate response"
2653 write(1,SURROGATE,sizeof(SURROGATE));
2654 _exit(run_list(head));
2655#else
2656 _exit(run_list_real(head)); /* leaks memory */
2657#endif
2658 }
2659 debug_printf("forked child %d\n",pid);
2660 close(channel[1]);
2661 pf = fdopen(channel[0],"r");
2662 debug_printf("pipe on FILE *%p\n",pf);
2663#else
2664 free_pipe_list(head,0);
2665 pf=popen("echo surrogate response","r");
2666 debug_printf("started fake pipe on FILE *%p\n",pf);
2667#endif
2668 return pf;
2669}
2670
2671/* this version hacked for testing purposes */
2672/* return code is exit status of the process that is run. */
2673static int process_command_subs(o_string *dest, struct p_context *ctx, struct in_str *input, int subst_end)
2674{
2675 int retcode;
2676 o_string result=NULL_O_STRING;
2677 struct p_context inner;
2678 FILE *p;
2679 struct in_str pipe_str;
2680 initialize_context(&inner);
2681
2682 /* recursion to generate command */
2683 retcode = parse_stream(&result, &inner, input, subst_end);
2684 if (retcode != 0) return retcode; /* syntax error or EOF */
2685 done_word(&result, &inner);
2686 done_pipe(&inner, PIPE_SEQ);
2687 b_free(&result);
2688
2689 p=generate_stream_from_list(inner.list_head);
2690 if (p==NULL) return 1;
2691 mark_open(fileno(p));
2692 setup_file_in_str(&pipe_str, p);
2693
2694 /* now send results of command back into original context */
2695 retcode = parse_stream(dest, ctx, &pipe_str, '\0');
2696 /* XXX In case of a syntax error, should we try to kill the child?
2697 * That would be tough to do right, so just read until EOF. */
2698 if (retcode == 1) {
2699 while (b_getch(&pipe_str)!=EOF) { /* discard */ };
2700 }
2701
2702 debug_printf("done reading from pipe, pclose()ing\n");
2703 /* This is the step that wait()s for the child. Should be pretty
2704 * safe, since we just read an EOF from its stdout. We could try
2705 * to better, by using wait(), and keeping track of background jobs
2706 * at the same time. That would be a lot of work, and contrary
2707 * to the KISS philosophy of this program. */
2708 mark_closed(fileno(p));
2709 retcode=pclose(p);
2710 free_pipe_list(inner.list_head,0);
2711 debug_printf("pclosed, retcode=%d\n",retcode);
2712 /* XXX this process fails to trim a single trailing newline */
2713 return retcode;
2714}
2715
2716static int parse_group(o_string *dest, struct p_context *ctx,
2717 struct in_str *input, int ch)
2718{
2719 int rcode, endch=0;
2720 struct p_context sub;
2721 struct child_prog *child = ctx->child;
2722 if (child->argv) {
2723 syntax();
2724 return 1; /* syntax error, groups and arglists don't mix */
2725 }
2726 initialize_context(&sub);
2727 switch(ch) {
2728 case '(': endch=')'; child->subshell=1; break;
2729 case '{': endch='}'; break;
2730 default: syntax(); /* really logic error */
2731 }
2732 rcode=parse_stream(dest,&sub,input,endch);
2733 done_word(dest,&sub); /* finish off the final word in the subcontext */
2734 done_pipe(&sub, PIPE_SEQ); /* and the final command there, too */
2735 child->group = sub.list_head;
2736 return rcode;
2737 /* child remains "open", available for possible redirects */
2738}
2739#endif
2740
2741/* basically useful version until someone wants to get fancier,
2742 * see the bash man page under "Parameter Expansion" */
2743static char *lookup_param(char *src)
2744{
c26e454d 2745 char *p;
641b0d37
JH		 2746 char *sep;
2747 char *default_val = NULL;
2748 int assign = 0;
2749 int expand_empty = 0;
c26e454d
WD		 2750
2751 if (!src)
2752 return NULL;
2753
641b0d37
JH		 2754 sep = strchr(src, ':');
2755
2756 if (sep) {
2757 *sep = '\0';
2758 if (*(sep + 1) == '-')
2759 default_val = sep+2;
2760 if (*(sep + 1) == '=') {
2761 default_val = sep+2;
2762 assign = 1;
2763 }
2764 if (*(sep + 1) == '+') {
2765 default_val = sep+2;
2766 expand_empty = 1;
2767 }
2768 }
2769
2770 p = getenv(src);
2771 if (!p)
2772 p = get_local_var(src);
2773
2774 if (!p || strlen(p) == 0) {
2775 p = default_val;
2776 if (assign) {
2777 char *var = malloc(strlen(src)+strlen(default_val)+2);
2778 if (var) {
2779 sprintf(var, "%s=%s", src, default_val);
2780 set_local_var(var, 0);
2781 }
2782 free(var);
2783 }
2784 } else if (expand_empty) {
2785 p += strlen(p);
2786 }
2787
2788 if (sep)
2789 *sep = ':';
c26e454d 2790
fe8c2806
WD		 2791 return p;
2792}
2793
c26e454d
WD		 2794#ifdef __U_BOOT__
2795static char *get_dollar_var(char ch)
2796{
2797 static char buf[40];
2798
2799 buf[0] = '\0';
2800 switch (ch) {
2801 case '?':
2802 sprintf(buf, "%u", (unsigned int)last_return_code);
2803 break;
2804 default:
2805 return NULL;
2806 }
2807 return buf;
2808}
2809#endif
2810
fe8c2806
WD		 2811/* return code: 0 for OK, 1 for syntax error */
2812static int handle_dollar(o_string *dest, struct p_context *ctx, struct in_str *input)
2813{
2814#ifndef __U_BOOT__
2815 int i, advance=0;
2816#else
2817 int advance=0;
2818#endif
2819#ifndef __U_BOOT__
2820 char sep[]=" ";
2821#endif
2822 int ch = input->peek(input); /* first character after the $ */
2823 debug_printf("handle_dollar: ch=%c\n",ch);
2824 if (isalpha(ch)) {
2825 b_addchr(dest, SPECIAL_VAR_SYMBOL);
2826 ctx->child->sp++;
2827 while(ch=b_peek(input),isalnum(ch) || ch=='_') {
2828 b_getch(input);
2829 b_addchr(dest,ch);
2830 }
2831 b_addchr(dest, SPECIAL_VAR_SYMBOL);
2832#ifndef __U_BOOT__
2833 } else if (isdigit(ch)) {
2834 i = ch-'0'; /* XXX is $0 special? */
2835 if (i<global_argc) {
2836 parse_string(dest, ctx, global_argv[i]); /* recursion */
2837 }
2838 advance = 1;
2839#endif
2840 } else switch (ch) {
2841#ifndef __U_BOOT__
2842 case '$':
2843 b_adduint(dest,getpid());
2844 advance = 1;
2845 break;
2846 case '!':
2847 if (last_bg_pid > 0) b_adduint(dest, last_bg_pid);
2848 advance = 1;
2849 break;
2850#endif
2851 case '?':
c26e454d 2852#ifndef __U_BOOT__
fe8c2806 2853 b_adduint(dest,last_return_code);
c26e454d
WD		 2854#else
2855 ctx->child->sp++;
2856 b_addchr(dest, SPECIAL_VAR_SYMBOL);
2857 b_addchr(dest, '$');
2858 b_addchr(dest, '?');
2859 b_addchr(dest, SPECIAL_VAR_SYMBOL);
2860#endif
fe8c2806
WD		 2861 advance = 1;
2862 break;
2863#ifndef __U_BOOT__
2864 case '#':
2865 b_adduint(dest,global_argc ? global_argc-1 : 0);
2866 advance = 1;
2867 break;
2868#endif
2869 case '{':
2870 b_addchr(dest, SPECIAL_VAR_SYMBOL);
2871 ctx->child->sp++;
2872 b_getch(input);
2873 /* XXX maybe someone will try to escape the '}' */
2874 while(ch=b_getch(input),ch!=EOF && ch!='}') {
2875 b_addchr(dest,ch);
2876 }
2877 if (ch != '}') {
2878 syntax();
2879 return 1;
2880 }
2881 b_addchr(dest, SPECIAL_VAR_SYMBOL);
2882 break;
2883#ifndef __U_BOOT__
2884 case '(':
2885 b_getch(input);
2886 process_command_subs(dest, ctx, input, ')');
2887 break;
2888 case '*':
2889 sep[0]=ifs[0];
2890 for (i=1; i<global_argc; i++) {
2891 parse_string(dest, ctx, global_argv[i]);
2892 if (i+1 < global_argc) parse_string(dest, ctx, sep);
2893 }
2894 break;
2895 case '@':
2896 case '-':
2897 case '_':
2898 /* still unhandled, but should be eventually */
2899 error_msg("unhandled syntax: $%c",ch);
2900 return 1;
2901 break;
2902#endif
2903 default:
2904 b_addqchr(dest,'$',dest->quote);
2905 }
2906 /* Eat the character if the flag was set. If the compiler
2907 * is smart enough, we could substitute "b_getch(input);"
2908 * for all the "advance = 1;" above, and also end up with
2909 * a nice size-optimized program. Hah! That'll be the day.
2910 */
2911 if (advance) b_getch(input);
2912 return 0;
2913}
2914
2915#ifndef __U_BOOT__
2916int parse_string(o_string *dest, struct p_context *ctx, const char *src)
2917{
2918 struct in_str foo;
2919 setup_string_in_str(&foo, src);
2920 return parse_stream(dest, ctx, &foo, '\0');
2921}
2922#endif
2923
2924/* return code is 0 for normal exit, 1 for syntax error */
2925int parse_stream(o_string *dest, struct p_context *ctx,
2926 struct in_str *input, int end_trigger)
2927{
2928 unsigned int ch, m;
2929#ifndef __U_BOOT__
2930 int redir_fd;
2931 redir_type redir_style;
2932#endif
2933 int next;
2934
2935 /* Only double-quote state is handled in the state variable dest->quote.
2936 * A single-quote triggers a bypass of the main loop until its mate is
2937 * found. When recursing, quote state is passed in via dest->quote. */
2938
2939 debug_printf("parse_stream, end_trigger=%d\n",end_trigger);
2940 while ((ch=b_getch(input))!=EOF) {
2941 m = map[ch];
2942#ifdef __U_BOOT__
2943 if (input->__promptme == 0) return 1;
2944#endif
2945 next = (ch == '\n') ? 0 : b_peek(input);
c26e454d
WD		 2946
2947 debug_printf("parse_stream: ch=%c (%d) m=%d quote=%d - %c\n",
2948 ch >= ' ' ? ch : '.', ch, m,
2949 dest->quote, ctx->stack == NULL ? '*' : '.');
2950
fe8c2806
WD		 2951 if (m==0 || ((m==1 || m==2) && dest->quote)) {
2952 b_addqchr(dest, ch, dest->quote);
2953 } else {
2954 if (m==2) { /* unquoted IFS */
2955 if (done_word(dest, ctx)) {
2956 return 1;
2957 }
2958 /* If we aren't performing a substitution, treat a newline as a
2959 * command separator. */
2960 if (end_trigger != '\0' && ch=='\n')
2961 done_pipe(ctx,PIPE_SEQ);
2962 }
2963 if (ch == end_trigger && !dest->quote && ctx->w==RES_NONE) {
2964 debug_printf("leaving parse_stream (triggered)\n");
2965 return 0;
2966 }
2967#if 0
2968 if (ch=='\n') {
2969 /* Yahoo! Time to run with it! */
2970 done_pipe(ctx,PIPE_SEQ);
2971 run_list(ctx->list_head);
2972 initialize_context(ctx);
2973 }
2974#endif
2975 if (m!=2) switch (ch) {
2976 case '#':
2977 if (dest->length == 0 && !dest->quote) {
2978 while(ch=b_peek(input),ch!=EOF && ch!='\n') { b_getch(input); }
2979 } else {
2980 b_addqchr(dest, ch, dest->quote);
2981 }
2982 break;
2983 case '\\':
2984 if (next == EOF) {
2985 syntax();
2986 return 1;
2987 }
2988 b_addqchr(dest, '\\', dest->quote);
2989 b_addqchr(dest, b_getch(input), dest->quote);
2990 break;
2991 case '$':
2992 if (handle_dollar(dest, ctx, input)!=0) return 1;
2993 break;
2994 case '\'':
2995 dest->nonnull = 1;
2996 while(ch=b_getch(input),ch!=EOF && ch!='\'') {
2997#ifdef __U_BOOT__
2998 if(input->__promptme == 0) return 1;
2999#endif
3000 b_addchr(dest,ch);
3001 }
3002 if (ch==EOF) {
3003 syntax();
3004 return 1;
3005 }
3006 break;
3007 case '"':
3008 dest->nonnull = 1;
3009 dest->quote = !dest->quote;
3010 break;
3011#ifndef __U_BOOT__
3012 case '`':
3013 process_command_subs(dest, ctx, input, '`');
3014 break;
3015 case '>':
3016 redir_fd = redirect_opt_num(dest);
3017 done_word(dest, ctx);
3018 redir_style=REDIRECT_OVERWRITE;
3019 if (next == '>') {
3020 redir_style=REDIRECT_APPEND;
3021 b_getch(input);
3022 } else if (next == '(') {
3023 syntax(); /* until we support >(list) Process Substitution */
3024 return 1;
3025 }
3026 setup_redirect(ctx, redir_fd, redir_style, input);
3027 break;
3028 case '<':
3029 redir_fd = redirect_opt_num(dest);
3030 done_word(dest, ctx);
3031 redir_style=REDIRECT_INPUT;
3032 if (next == '<') {
3033 redir_style=REDIRECT_HEREIS;
3034 b_getch(input);
3035 } else if (next == '>') {
3036 redir_style=REDIRECT_IO;
3037 b_getch(input);
3038 } else if (next == '(') {
3039 syntax(); /* until we support <(list) Process Substitution */
3040 return 1;
3041 }
3042 setup_redirect(ctx, redir_fd, redir_style, input);
3043 break;
3044#endif
3045 case ';':
3046 done_word(dest, ctx);
3047 done_pipe(ctx,PIPE_SEQ);
3048 break;
3049 case '&':
3050 done_word(dest, ctx);
3051 if (next=='&') {
3052 b_getch(input);
3053 done_pipe(ctx,PIPE_AND);
3054 } else {
3055#ifndef __U_BOOT__
3056 done_pipe(ctx,PIPE_BG);
3057#else
3058 syntax_err();
3059 return 1;
3060#endif
3061 }
3062 break;
3063 case '|':
3064 done_word(dest, ctx);
3065 if (next=='|') {
3066 b_getch(input);
3067 done_pipe(ctx,PIPE_OR);
3068 } else {
3069 /* we could pick up a file descriptor choice here
3070 * with redirect_opt_num(), but bash doesn't do it.
3071 * "echo foo 2| cat" yields "foo 2". */
3072#ifndef __U_BOOT__
3073 done_command(ctx);
3074#else
3075 syntax_err();
3076 return 1;
3077#endif
3078 }
3079 break;
3080#ifndef __U_BOOT__
3081 case '(':
3082 case '{':
3083 if (parse_group(dest, ctx, input, ch)!=0) return 1;
3084 break;
3085 case ')':
3086 case '}':
3087 syntax(); /* Proper use of this character caught by end_trigger */
3088 return 1;
3089 break;
3090#endif
3091 default:
3092 syntax(); /* this is really an internal logic error */
3093 return 1;
3094 }
3095 }
3096 }
3097 /* complain if quote? No, maybe we just finished a command substitution
3098 * that was quoted. Example:
3099 * $ echo "`cat foo` plus more"
3100 * and we just got the EOF generated by the subshell that ran "cat foo"
3101 * The only real complaint is if we got an EOF when end_trigger != '\0',
3102 * that is, we were really supposed to get end_trigger, and never got
3103 * one before the EOF. Can't use the standard "syntax error" return code,
3104 * so that parse_stream_outer can distinguish the EOF and exit smoothly. */
3105 debug_printf("leaving parse_stream (EOF)\n");
3106 if (end_trigger != '\0') return -1;
3107 return 0;
3108}
3109
3110void mapset(const unsigned char *set, int code)
3111{
3112 const unsigned char *s;
3113 for (s=set; *s; s++) map[*s] = code;
3114}
3115
3116void update_ifs_map(void)
3117{
3118 /* char *ifs and char map[256] are both globals. */
77ddac94
WD		 3119 ifs = (uchar *)getenv("IFS");
3120 if (ifs == NULL) ifs=(uchar *)" \t\n";
fe8c2806
WD		 3121 /* Precompute a list of 'flow through' behavior so it can be treated
3122 * quickly up front. Computation is necessary because of IFS.
3123 * Special case handling of IFS == " \t\n" is not implemented.
3124 * The map[] array only really needs two bits each, and on most machines
3125 * that would be faster because of the reduced L1 cache footprint.
3126 */
3127 memset(map,0,sizeof(map)); /* most characters flow through always */
3128#ifndef __U_BOOT__
77ddac94
WD		 3129 mapset((uchar *)"\\$'\"`", 3); /* never flow through */
3130 mapset((uchar *)"<>;&|(){}#", 1); /* flow through if quoted */
fe8c2806 3131#else
77ddac94
WD		 3132 mapset((uchar *)"\\$'\"", 3); /* never flow through */
3133 mapset((uchar *)";&|#", 1); /* flow through if quoted */
fe8c2806
WD		 3134#endif
3135 mapset(ifs, 2); /* also flow through if quoted */
3136}
3137
3138/* most recursion does not come through here, the exeception is
3139 * from builtin_source() */
3140int parse_stream_outer(struct in_str *inp, int flag)
3141{
3142
3143 struct p_context ctx;
3144 o_string temp=NULL_O_STRING;
3145 int rcode;
3146#ifdef __U_BOOT__
3147 int code = 0;
3148#endif
3149 do {
3150 ctx.type = flag;
3151 initialize_context(&ctx);
3152 update_ifs_map();
77ddac94 3153 if (!(flag & FLAG_PARSE_SEMICOLON) || (flag & FLAG_REPARSING)) mapset((uchar *)";$&|", 0);
fe8c2806
WD		 3154 inp->promptmode=1;
3155 rcode = parse_stream(&temp, &ctx, inp, '\n');
3156#ifdef __U_BOOT__
3157 if (rcode == 1) flag_repeat = 0;
3158#endif
3159 if (rcode != 1 && ctx.old_flag != 0) {
3160 syntax();
3161#ifdef __U_BOOT__
3162 flag_repeat = 0;
3163#endif
3164 }
3165 if (rcode != 1 && ctx.old_flag == 0) {
3166 done_word(&temp, &ctx);
3167 done_pipe(&ctx,PIPE_SEQ);
3168#ifndef __U_BOOT__
3169 run_list(ctx.list_head);
3170#else
c26e454d
WD		 3171 code = run_list(ctx.list_head);
3172 if (code == -2) { /* exit */
3173 b_free(&temp);
3174 code = 0;
3175 /* XXX hackish way to not allow exit from main loop */
3176 if (inp->peek == file_peek) {
3177 printf("exit not allowed from main input shell.\n");
3178 continue;
3179 }
3180 break;
3181 }
3182 if (code == -1)
fe8c2806
WD		 3183 flag_repeat = 0;
3184#endif
3185 } else {
3186 if (ctx.old_flag != 0) {
3187 free(ctx.stack);
3188 b_reset(&temp);
3189 }
3190#ifdef __U_BOOT__
3191 if (inp->__promptme == 0) printf("<INTERRUPT>\n");
3192 inp->__promptme = 1;
3193#endif
3194 temp.nonnull = 0;
3195 temp.quote = 0;
3196 inp->p = NULL;
3197 free_pipe_list(ctx.list_head,0);
3198 }
3199 b_free(&temp);
3200 } while (rcode != -1 && !(flag & FLAG_EXIT_FROM_LOOP)); /* loop on syntax errors, return on EOF */
3201#ifndef __U_BOOT__
3202 return 0;
3203#else
3204 return (code != 0) ? 1 : 0;
3205#endif /* __U_BOOT__ */
3206}
3207
3208#ifndef __U_BOOT__
3209static int parse_string_outer(const char *s, int flag)
3210#else
c8a2079e 3211int parse_string_outer(const char *s, int flag)
fe8c2806
WD		 3212#endif /* __U_BOOT__ */
3213{
3214 struct in_str input;
3215#ifdef __U_BOOT__
3216 char *p = NULL;
3217 int rcode;
3218 if ( !s || !*s)
3219 return 1;
3220 if (!(p = strchr(s, '\n')) || *++p) {
3221 p = xmalloc(strlen(s) + 2);
3222 strcpy(p, s);
3223 strcat(p, "\n");
3224 setup_string_in_str(&input, p);
3225 rcode = parse_stream_outer(&input, flag);
3226 free(p);
3227 return rcode;
3228 } else {
3229#endif
3230 setup_string_in_str(&input, s);
3231 return parse_stream_outer(&input, flag);
3232#ifdef __U_BOOT__
3233 }
3234#endif
3235}
3236
3237#ifndef __U_BOOT__
3238static int parse_file_outer(FILE *f)
3239#else
3240int parse_file_outer(void)
3241#endif
3242{
3243 int rcode;
3244 struct in_str input;
3245#ifndef __U_BOOT__
3246 setup_file_in_str(&input, f);
3247#else
3248 setup_file_in_str(&input);
3249#endif
3250 rcode = parse_stream_outer(&input, FLAG_PARSE_SEMICOLON);
3251 return rcode;
3252}
3253
3254#ifdef __U_BOOT__
2e5167cc 3255#ifdef CONFIG_NEEDS_MANUAL_RELOC
3e38691e
WD		 3256static void u_boot_hush_reloc(void)
3257{
3e38691e
WD		 3258 unsigned long addr;
3259 struct reserved_combo *r;
3260
3261 for (r=reserved_list; r<reserved_list+NRES; r++) {
3262 addr = (ulong) (r->literal) + gd->reloc_off;
3263 r->literal = (char *)addr;
3264 }
3265}
521af04d 3266#endif
3e38691e 3267
fe8c2806
WD		 3268int u_boot_hush_start(void)
3269{
2d5b561e
WD		 3270 if (top_vars == NULL) {
3271 top_vars = malloc(sizeof(struct variables));
3272 top_vars->name = "HUSH_VERSION";
3273 top_vars->value = "0.01";
3274 top_vars->next = 0;
3275 top_vars->flg_export = 0;
3276 top_vars->flg_read_only = 1;
2e5167cc 3277#ifdef CONFIG_NEEDS_MANUAL_RELOC
2d5b561e 3278 u_boot_hush_reloc();
521af04d 3279#endif
2d5b561e 3280 }
fe8c2806
WD		 3281 return 0;
3282}
3283
3284static void *xmalloc(size_t size)
3285{
3286 void *p = NULL;
3287
3288 if (!(p = malloc(size))) {
3289 printf("ERROR : memory not allocated\n");
3290 for(;;);
3291 }
3292 return p;
3293}
3294
3295static void *xrealloc(void *ptr, size_t size)
3296{
3297 void *p = NULL;
3298
3299 if (!(p = realloc(ptr, size))) {
3300 printf("ERROR : memory not allocated\n");
3301 for(;;);
3302 }
3303 return p;
3304}
3305#endif /* __U_BOOT__ */
3306
3307#ifndef __U_BOOT__
3308/* Make sure we have a controlling tty. If we get started under a job
3309 * aware app (like bash for example), make sure we are now in charge so
3310 * we don't fight over who gets the foreground */
d0fb80c3 3311static void setup_job_control(void)
fe8c2806
WD		 3312{
3313 static pid_t shell_pgrp;
3314 /* Loop until we are in the foreground. */
3315 while (tcgetpgrp (shell_terminal) != (shell_pgrp = getpgrp ()))
3316 kill (- shell_pgrp, SIGTTIN);
3317
3318 /* Ignore interactive and job-control signals. */
3319 signal(SIGINT, SIG_IGN);
3320 signal(SIGQUIT, SIG_IGN);
3321 signal(SIGTERM, SIG_IGN);
3322 signal(SIGTSTP, SIG_IGN);
3323 signal(SIGTTIN, SIG_IGN);
3324 signal(SIGTTOU, SIG_IGN);
3325 signal(SIGCHLD, SIG_IGN);
3326
3327 /* Put ourselves in our own process group. */
3328 setsid();
3329 shell_pgrp = getpid ();
3330 setpgid (shell_pgrp, shell_pgrp);
3331
3332 /* Grab control of the terminal. */
3333 tcsetpgrp(shell_terminal, shell_pgrp);
3334}
3335
54841ab5 3336int hush_main(int argc, char * const *argv)
fe8c2806
WD		 3337{
3338 int opt;
3339 FILE *input;
3340 char **e = environ;
3341
3342 /* XXX what should these be while sourcing /etc/profile? */
3343 global_argc = argc;
3344 global_argv = argv;
3345
3346 /* (re?) initialize globals. Sometimes hush_main() ends up calling
3347 * hush_main(), therefore we cannot rely on the BSS to zero out this
3348 * stuff. Reset these to 0 every time. */
3349 ifs = NULL;
3350 /* map[] is taken care of with call to update_ifs_map() */
3351 fake_mode = 0;
3352 interactive = 0;
3353 close_me_head = NULL;
3354 last_bg_pid = 0;
3355 job_list = NULL;
3356 last_jobid = 0;
3357
3358 /* Initialize some more globals to non-zero values */
3359 set_cwd();
d0fb80c3 3360#ifdef CONFIG_FEATURE_COMMAND_EDITING
fe8c2806
WD		 3361 cmdedit_set_initial_prompt();
3362#else
3363 PS1 = NULL;
3364#endif
3365 PS2 = "> ";
3366
3367 /* initialize our shell local variables with the values
3368 * currently living in the environment */
3369 if (e) {
3370 for (; *e; e++)
3371 set_local_var(*e, 2); /* without call putenv() */
3372 }
3373
3374 last_return_code=EXIT_SUCCESS;
3375
3376
3377 if (argv[0] && argv[0][0] == '-') {
3378 debug_printf("\nsourcing /etc/profile\n");
3379 if ((input = fopen("/etc/profile", "r")) != NULL) {
3380 mark_open(fileno(input));
3381 parse_file_outer(input);
3382 mark_closed(fileno(input));
3383 fclose(input);
3384 }
3385 }
3386 input=stdin;
3387
3388 while ((opt = getopt(argc, argv, "c:xif")) > 0) {
3389 switch (opt) {
3390 case 'c':
3391 {
3392 global_argv = argv+optind;
3393 global_argc = argc-optind;
3394 opt = parse_string_outer(optarg, FLAG_PARSE_SEMICOLON);
3395 goto final_return;
3396 }
3397 break;
3398 case 'i':
3399 interactive++;
3400 break;
3401 case 'f':
3402 fake_mode++;
3403 break;
3404 default:
3405#ifndef BB_VER
3406 fprintf(stderr, "Usage: sh [FILE]...\n"
3407 " or: sh -c command [args]...\n\n");
3408 exit(EXIT_FAILURE);
3409#else
3410 show_usage();
3411#endif
3412 }
3413 }
3414 /* A shell is interactive if the `-i' flag was given, or if all of
3415 * the following conditions are met:
3416 * no -c command
3417 * no arguments remaining or the -s flag given
3418 * standard input is a terminal
3419 * standard output is a terminal
3420 * Refer to Posix.2, the description of the `sh' utility. */
3421 if (argv[optind]==NULL && input==stdin &&
3422 isatty(fileno(stdin)) && isatty(fileno(stdout))) {
3423 interactive++;
3424 }
3425
3426 debug_printf("\ninteractive=%d\n", interactive);
3427 if (interactive) {
3428 /* Looks like they want an interactive shell */
8bde7f77 3429#ifndef CONFIG_FEATURE_SH_EXTRA_QUIET
d0fb80c3
WD		 3430 printf( "\n\n" BB_BANNER " hush - the humble shell v0.01 (testing)\n");
3431 printf( "Enter 'help' for a list of built-in commands.\n\n");
3432#endif
fe8c2806
WD		 3433 setup_job_control();
3434 }
3435
3436 if (argv[optind]==NULL) {
3437 opt=parse_file_outer(stdin);
3438 goto final_return;
3439 }
3440
3441 debug_printf("\nrunning script '%s'\n", argv[optind]);
3442 global_argv = argv+optind;
3443 global_argc = argc-optind;
3444 input = xfopen(argv[optind], "r");
3445 opt = parse_file_outer(input);
3446
d0fb80c3 3447#ifdef CONFIG_FEATURE_CLEAN_UP
fe8c2806
WD		 3448 fclose(input);
3449 if (cwd && cwd != unknown)
3450 free((char*)cwd);
3451 {
3452 struct variables *cur, *tmp;
3453 for(cur = top_vars; cur; cur = tmp) {
3454 tmp = cur->next;
3455 if (!cur->flg_read_only) {
3456 free(cur->name);
3457 free(cur->value);
3458 free(cur);
3459 }
3460 }
3461 }
3462#endif
3463
3464final_return:
3465 return(opt?opt:last_return_code);
3466}
3467#endif
3468
3469static char *insert_var_value(char *inp)
3470{
3471 int res_str_len = 0;
3472 int len;
3473 int done = 0;
3474 char *p, *p1, *res_str = NULL;
3475
3476 while ((p = strchr(inp, SPECIAL_VAR_SYMBOL))) {
3477 if (p != inp) {
3478 len = p - inp;
3479 res_str = xrealloc(res_str, (res_str_len + len));
3480 strncpy((res_str + res_str_len), inp, len);
3481 res_str_len += len;
3482 }
3483 inp = ++p;
3484 p = strchr(inp, SPECIAL_VAR_SYMBOL);
3485 *p = '\0';
3486 if ((p1 = lookup_param(inp))) {
3487 len = res_str_len + strlen(p1);
3488 res_str = xrealloc(res_str, (1 + len));
3489 strcpy((res_str + res_str_len), p1);
3490 res_str_len = len;
3491 }
3492 *p = SPECIAL_VAR_SYMBOL;
3493 inp = ++p;
3494 done = 1;
3495 }
3496 if (done) {
3497 res_str = xrealloc(res_str, (1 + res_str_len + strlen(inp)));
3498 strcpy((res_str + res_str_len), inp);
3499 while ((p = strchr(res_str, '\n'))) {
3500 *p = ' ';
3501 }
3502 }
3503 return (res_str == NULL) ? inp : res_str;
3504}
3505
3506static char **make_list_in(char **inp, char *name)
3507{
3508 int len, i;
3509 int name_len = strlen(name);
3510 int n = 0;
3511 char **list;
3512 char *p1, *p2, *p3;
3513
3514 /* create list of variable values */
3515 list = xmalloc(sizeof(*list));
3516 for (i = 0; inp[i]; i++) {
3517 p3 = insert_var_value(inp[i]);
3518 p1 = p3;
3519 while (*p1) {
3520 if ((*p1 == ' ')) {
3521 p1++;
3522 continue;
3523 }
3524 if ((p2 = strchr(p1, ' '))) {
3525 len = p2 - p1;
3526 } else {
3527 len = strlen(p1);
3528 p2 = p1 + len;
3529 }
3530 /* we use n + 2 in realloc for list,because we add
3531 * new element and then we will add NULL element */
3532 list = xrealloc(list, sizeof(*list) * (n + 2));
3533 list[n] = xmalloc(2 + name_len + len);
3534 strcpy(list[n], name);
3535 strcat(list[n], "=");
3536 strncat(list[n], p1, len);
3537 list[n++][name_len + len + 1] = '\0';
3538 p1 = p2;
3539 }
3540 if (p3 != inp[i]) free(p3);
3541 }
3542 list[n] = NULL;
3543 return list;
3544}
3545
3546/* Make new string for parser */
3547static char * make_string(char ** inp)
3548{
3549 char *p;
3550 char *str = NULL;
3551 int n;
3552 int len = 2;
3553
3554 for (n = 0; inp[n]; n++) {
3555 p = insert_var_value(inp[n]);
3556 str = xrealloc(str, (len + strlen(p)));
3557 if (n) {
3558 strcat(str, " ");
3559 } else {
3560 *str = '\0';
3561 }
3562 strcat(str, p);
3563 len = strlen(str) + 3;
3564 if (p != inp[n]) free(p);
3565 }
3566 len = strlen(str);
3567 *(str + len) = '\n';
3568 *(str + len + 1) = '\0';
3569 return str;
3570}
3571
81473f67 3572#ifdef __U_BOOT__
54841ab5 3573int do_showvar (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
81473f67
HS		 3574{
3575 int i, k;
3576 int rcode = 0;
3577 struct variables *cur;
3578
3579 if (argc == 1) { /* Print all env variables */
3580 for (cur = top_vars; cur; cur = cur->next) {
3581 printf ("%s=%s\n", cur->name, cur->value);
3582 if (ctrlc ()) {
3583 puts ("\n ** Abort\n");
3584 return 1;
3585 }
3586 }
3587 return 0;
3588 }
3589 for (i = 1; i < argc; ++i) { /* print single env variables */
3590 char *name = argv[i];
3591
3592 k = -1;
3593 for (cur = top_vars; cur; cur = cur->next) {
3594 if(strcmp (cur->name, name) == 0) {
3595 k = 0;
3596 printf ("%s=%s\n", cur->name, cur->value);
3597 }
3598 if (ctrlc ()) {
3599 puts ("\n ** Abort\n");
3600 return 1;
3601 }
3602 }
3603 if (k < 0) {
3604 printf ("## Error: \"%s\" not defined\n", name);
3605 rcode ++;
3606 }
3607 }
3608 return rcode;
3609}
3610
3611U_BOOT_CMD(
6d0f6bcf 3612 showvar, CONFIG_SYS_MAXARGS, 1, do_showvar,
2fb2604d 3613 "print local hushshell variables",
81473f67
HS		 3614 "\n - print values of all hushshell variables\n"
3615 "showvar name ...\n"
a89c33db 3616 " - print value of hushshell variable 'name'"
81473f67
HS		 3617);
3618
3619#endif
fe8c2806 3620/****************************************************************************/
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