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[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:
20 * simple_itoa() was lifted from boa-0.93.15
21 * b_addchr() derived from similar w_addchar function in glibc-2.2
22 * setup_redirect(), redirect_opt_num(), and big chunks of main()
23 * and many builtins derived from contributions by Erik Andersen
24 * miscellaneous bugfixes from Matt Kraai
25 *
26 * There are two big (and related) architecture differences between
27 * this parser and the lash parser. One is that this version is
28 * actually designed from the ground up to understand nearly all
29 * of the Bourne grammar. The second, consequential change is that
30 * the parser and input reader have been turned inside out. Now,
31 * the parser is in control, and asks for input as needed. The old
32 * way had the input reader in control, and it asked for parsing to
33 * take place as needed. The new way makes it much easier to properly
34 * handle the recursion implicit in the various substitutions, especially
35 * across continuation lines.
36 *
37 * Bash grammar not implemented: (how many of these were in original sh?)
38 * $@ (those sure look like weird quoting rules)
39 * $_
40 * ! negation operator for pipes
41 * &> and >& redirection of stdout+stderr
42 * Brace Expansion
43 * Tilde Expansion
44 * fancy forms of Parameter Expansion
45 * aliases
46 * Arithmetic Expansion
47 * <(list) and >(list) Process Substitution
48 * reserved words: case, esac, select, function
49 * Here Documents ( << word )
50 * Functions
51 * Major bugs:
52 * job handling woefully incomplete and buggy
53 * reserved word execution woefully incomplete and buggy
54 * to-do:
55 * port selected bugfixes from post-0.49 busybox lash - done?
56 * finish implementing reserved words: for, while, until, do, done
57 * change { and } from special chars to reserved words
58 * builtins: break, continue, eval, return, set, trap, ulimit
59 * test magic exec
60 * handle children going into background
61 * clean up recognition of null pipes
62 * check setting of global_argc and global_argv
63 * control-C handling, probably with longjmp
64 * follow IFS rules more precisely, including update semantics
65 * figure out what to do with backslash-newline
66 * explain why we use signal instead of sigaction
67 * propagate syntax errors, die on resource errors?
68 * continuation lines, both explicit and implicit - done?
69 * memory leak finding and plugging - done?
70 * more testing, especially quoting rules and redirection
71 * document how quoting rules not precisely followed for variable assignments
72 * maybe change map[] to use 2-bit entries
73 * (eventually) remove all the printf's
74 *
75 * This program is free software; you can redistribute it and/or modify
76 * it under the terms of the GNU General Public License as published by
77 * the Free Software Foundation; either version 2 of the License, or
78 * (at your option) any later version.
79 *
80 * This program is distributed in the hope that it will be useful,
81 * but WITHOUT ANY WARRANTY; without even the implied warranty of
82 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
83 * General Public License for more details.
84 *
85 * You should have received a copy of the GNU General Public License
86 * along with this program; if not, write to the Free Software
87 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
88 */
89#define __U_BOOT__
90#ifdef __U_BOOT__
91#include <malloc.h> /* malloc, free, realloc*/
92#include <linux/ctype.h> /* isalpha, isdigit */
93#include <common.h> /* readline */
94#include <hush.h>
95#include <command.h> /* find_cmd */
8bde7f77
WD		 96/*cmd_boot.c*/
97extern int do_bootd (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]); /* do_bootd */
fe8c2806
WD		 98#endif
99#ifdef CFG_HUSH_PARSER
100#ifndef __U_BOOT__
101#include <ctype.h> /* isalpha, isdigit */
102#include <unistd.h> /* getpid */
103#include <stdlib.h> /* getenv, atoi */
104#include <string.h> /* strchr */
105#include <stdio.h> /* popen etc. */
106#include <glob.h> /* glob, of course */
107#include <stdarg.h> /* va_list */
108#include <errno.h>
109#include <fcntl.h>
110#include <getopt.h> /* should be pretty obvious */
111
112#include <sys/stat.h> /* ulimit */
113#include <sys/types.h>
114#include <sys/wait.h>
115#include <signal.h>
116
117/* #include <dmalloc.h> */
fe8c2806 118
d0fb80c3 119#if 1
fe8c2806
WD		 120#include "busybox.h"
121#include "cmdedit.h"
122#else
123#define applet_name "hush"
124#include "standalone.h"
125#define hush_main main
d0fb80c3
WD		 126#undef CONFIG_FEATURE_SH_FANCY_PROMPT
127#define BB_BANNER
fe8c2806
WD		 128#endif
129#endif
130#define SPECIAL_VAR_SYMBOL 03
131#ifndef __U_BOOT__
132#define FLAG_EXIT_FROM_LOOP 1
133#define FLAG_PARSE_SEMICOLON (1 << 1) /* symbol ';' is special for parser */
134#define FLAG_REPARSING (1 << 2) /* >= 2nd pass */
135
136#endif
137
138#ifdef __U_BOOT__
d87080b7
WD		 139DECLARE_GLOBAL_DATA_PTR;
140
fe8c2806
WD		 141#define EXIT_SUCCESS 0
142#define EOF -1
143#define syntax() syntax_err()
144#define xstrdup strdup
145#define error_msg printf
146#else
147typedef enum {
148 REDIRECT_INPUT = 1,
149 REDIRECT_OVERWRITE = 2,
150 REDIRECT_APPEND = 3,
151 REDIRECT_HEREIS = 4,
152 REDIRECT_IO = 5
153} redir_type;
154
155/* The descrip member of this structure is only used to make debugging
156 * output pretty */
157struct {int mode; int default_fd; char *descrip;} redir_table[] = {
158 { 0, 0, "()" },
159 { O_RDONLY, 0, "<" },
160 { O_CREAT|O_TRUNC|O_WRONLY, 1, ">" },
161 { O_CREAT|O_APPEND|O_WRONLY, 1, ">>" },
162 { O_RDONLY, -1, "<<" },
163 { O_RDWR, 1, "<>" }
164};
165#endif
166
167typedef enum {
168 PIPE_SEQ = 1,
169 PIPE_AND = 2,
170 PIPE_OR = 3,
171 PIPE_BG = 4,
172} pipe_style;
173
174/* might eventually control execution */
175typedef enum {
176 RES_NONE = 0,
177 RES_IF = 1,
178 RES_THEN = 2,
179 RES_ELIF = 3,
180 RES_ELSE = 4,
181 RES_FI = 5,
182 RES_FOR = 6,
183 RES_WHILE = 7,
184 RES_UNTIL = 8,
185 RES_DO = 9,
186 RES_DONE = 10,
187 RES_XXXX = 11,
188 RES_IN = 12,
189 RES_SNTX = 13
190} reserved_style;
191#define FLAG_END (1<<RES_NONE)
192#define FLAG_IF (1<<RES_IF)
193#define FLAG_THEN (1<<RES_THEN)
194#define FLAG_ELIF (1<<RES_ELIF)
195#define FLAG_ELSE (1<<RES_ELSE)
196#define FLAG_FI (1<<RES_FI)
197#define FLAG_FOR (1<<RES_FOR)
198#define FLAG_WHILE (1<<RES_WHILE)
199#define FLAG_UNTIL (1<<RES_UNTIL)
200#define FLAG_DO (1<<RES_DO)
201#define FLAG_DONE (1<<RES_DONE)
202#define FLAG_IN (1<<RES_IN)
203#define FLAG_START (1<<RES_XXXX)
204
205/* This holds pointers to the various results of parsing */
206struct p_context {
207 struct child_prog *child;
208 struct pipe *list_head;
209 struct pipe *pipe;
210#ifndef __U_BOOT__
211 struct redir_struct *pending_redirect;
212#endif
213 reserved_style w;
214 int old_flag; /* for figuring out valid reserved words */
215 struct p_context *stack;
216 int type; /* define type of parser : ";$" common or special symbol */
217 /* How about quoting status? */
218};
219
220#ifndef __U_BOOT__
221struct redir_struct {
222 redir_type type; /* type of redirection */
223 int fd; /* file descriptor being redirected */
224 int dup; /* -1, or file descriptor being duplicated */
225 struct redir_struct *next; /* pointer to the next redirect in the list */
226 glob_t word; /* *word.gl_pathv is the filename */
227};
228#endif
229
230struct child_prog {
231#ifndef __U_BOOT__
232 pid_t pid; /* 0 if exited */
233#endif
234 char **argv; /* program name and arguments */
235#ifdef __U_BOOT__
236 int argc; /* number of program arguments */
237#endif
238 struct pipe *group; /* if non-NULL, first in group or subshell */
239#ifndef __U_BOOT__
240 int subshell; /* flag, non-zero if group must be forked */
241 struct redir_struct *redirects; /* I/O redirections */
242 glob_t glob_result; /* result of parameter globbing */
243 int is_stopped; /* is the program currently running? */
244 struct pipe *family; /* pointer back to the child's parent pipe */
245#endif
246 int sp; /* number of SPECIAL_VAR_SYMBOL */
247 int type;
248};
249
250struct pipe {
251#ifndef __U_BOOT__
252 int jobid; /* job number */
253#endif
254 int num_progs; /* total number of programs in job */
255#ifndef __U_BOOT__
256 int running_progs; /* number of programs running */
257 char *text; /* name of job */
258 char *cmdbuf; /* buffer various argv's point into */
259 pid_t pgrp; /* process group ID for the job */
260#endif
261 struct child_prog *progs; /* array of commands in pipe */
262 struct pipe *next; /* to track background commands */
263#ifndef __U_BOOT__
264 int stopped_progs; /* number of programs alive, but stopped */
265 int job_context; /* bitmask defining current context */
266#endif
267 pipe_style followup; /* PIPE_BG, PIPE_SEQ, PIPE_OR, PIPE_AND */
268 reserved_style r_mode; /* supports if, for, while, until */
269};
270
271#ifndef __U_BOOT__
272struct close_me {
273 int fd;
274 struct close_me *next;
275};
276#endif
277
278struct variables {
279 char *name;
280 char *value;
281 int flg_export;
282 int flg_read_only;
283 struct variables *next;
284};
285
286/* globals, connect us to the outside world
287 * the first three support $?, $#, and $1 */
288#ifndef __U_BOOT__
289char **global_argv;
290unsigned int global_argc;
291#endif
292unsigned int last_return_code;
c26e454d 293int nesting_level;
fe8c2806
WD		 294#ifndef __U_BOOT__
295extern char **environ; /* This is in <unistd.h>, but protected with __USE_GNU */
296#endif
297
298/* "globals" within this file */
77ddac94 299static uchar *ifs;
fe8c2806
WD		 300static char map[256];
301#ifndef __U_BOOT__
302static int fake_mode;
303static int interactive;
304static struct close_me *close_me_head;
305static const char *cwd;
306static struct pipe *job_list;
307static unsigned int last_bg_pid;
308static unsigned int last_jobid;
309static unsigned int shell_terminal;
310static char *PS1;
311static char *PS2;
312struct variables shell_ver = { "HUSH_VERSION", "0.01", 1, 1, 0 };
313struct variables *top_vars = &shell_ver;
314#else
315static int flag_repeat = 0;
316static int do_repeat = 0;
2d5b561e 317static struct variables *top_vars = NULL ;
fe8c2806
WD		 318#endif /*__U_BOOT__ */
319
320#define B_CHUNK (100)
321#define B_NOSPAC 1
322
323typedef struct {
324 char *data;
325 int length;
326 int maxlen;
327 int quote;
328 int nonnull;
329} o_string;
330#define NULL_O_STRING {NULL,0,0,0,0}
331/* used for initialization:
332 o_string foo = NULL_O_STRING; */
333
334/* I can almost use ordinary FILE *. Is open_memstream() universally
335 * available? Where is it documented? */
336struct in_str {
337 const char *p;
338#ifndef __U_BOOT__
339 char peek_buf[2];
340#endif
341 int __promptme;
342 int promptmode;
343#ifndef __U_BOOT__
344 FILE *file;
345#endif
346 int (*get) (struct in_str *);
347 int (*peek) (struct in_str *);
348};
349#define b_getch(input) ((input)->get(input))
350#define b_peek(input) ((input)->peek(input))
351
352#ifndef __U_BOOT__
353#define JOB_STATUS_FORMAT "[%d] %-22s %.40s\n"
354
355struct built_in_command {
356 char *cmd; /* name */
357 char *descr; /* description */
358 int (*function) (struct child_prog *); /* function ptr */
359};
360#endif
361
4cacf7c6
SR		 362/* define DEBUG_SHELL for debugging output (obviously ;-)) */
363#if 0
364#define DEBUG_SHELL
365#endif
366
fe8c2806
WD		 367/* This should be in utility.c */
368#ifdef DEBUG_SHELL
369#ifndef __U_BOOT__
370static void debug_printf(const char *format, ...)
371{
372 va_list args;
373 va_start(args, format);
374 vfprintf(stderr, format, args);
375 va_end(args);
376}
377#else
4cacf7c6 378#define debug_printf(fmt,args...) printf (fmt ,##args)
fe8c2806
WD		 379#endif
380#else
381static inline void debug_printf(const char *format, ...) { }
382#endif
383#define final_printf debug_printf
384
385#ifdef __U_BOOT__
386static void syntax_err(void) {
387 printf("syntax error\n");
388}
389#else
390static void __syntax(char *file, int line) {
391 error_msg("syntax error %s:%d", file, line);
392}
393#define syntax() __syntax(__FILE__, __LINE__)
394#endif
395
396#ifdef __U_BOOT__
397static void *xmalloc(size_t size);
398static void *xrealloc(void *ptr, size_t size);
399#else
400/* Index of subroutines: */
401/* function prototypes for builtins */
402static int builtin_cd(struct child_prog *child);
403static int builtin_env(struct child_prog *child);
404static int builtin_eval(struct child_prog *child);
405static int builtin_exec(struct child_prog *child);
406static int builtin_exit(struct child_prog *child);
407static int builtin_export(struct child_prog *child);
408static int builtin_fg_bg(struct child_prog *child);
409static int builtin_help(struct child_prog *child);
410static int builtin_jobs(struct child_prog *child);
411static int builtin_pwd(struct child_prog *child);
412static int builtin_read(struct child_prog *child);
413static int builtin_set(struct child_prog *child);
414static int builtin_shift(struct child_prog *child);
415static int builtin_source(struct child_prog *child);
416static int builtin_umask(struct child_prog *child);
417static int builtin_unset(struct child_prog *child);
418static int builtin_not_written(struct child_prog *child);
419#endif
420/* o_string manipulation: */
421static int b_check_space(o_string *o, int len);
422static int b_addchr(o_string *o, int ch);
423static void b_reset(o_string *o);
424static int b_addqchr(o_string *o, int ch, int quote);
c26e454d 425#ifndef __U_BOOT__
fe8c2806 426static int b_adduint(o_string *o, unsigned int i);
c26e454d 427#endif
fe8c2806
WD		 428/* in_str manipulations: */
429static int static_get(struct in_str *i);
430static int static_peek(struct in_str *i);
431static int file_get(struct in_str *i);
432static int file_peek(struct in_str *i);
433#ifndef __U_BOOT__
434static void setup_file_in_str(struct in_str *i, FILE *f);
435#else
436static void setup_file_in_str(struct in_str *i);
437#endif
438static void setup_string_in_str(struct in_str *i, const char *s);
439#ifndef __U_BOOT__
440/* close_me manipulations: */
441static void mark_open(int fd);
442static void mark_closed(int fd);
d0fb80c3 443static void close_all(void);
fe8c2806
WD		 444#endif
445/* "run" the final data structures: */
446static char *indenter(int i);
447static int free_pipe_list(struct pipe *head, int indent);
448static int free_pipe(struct pipe *pi, int indent);
449/* really run the final data structures: */
450#ifndef __U_BOOT__
451static int setup_redirects(struct child_prog *prog, int squirrel[]);
452#endif
453static int run_list_real(struct pipe *pi);
454#ifndef __U_BOOT__
455static void pseudo_exec(struct child_prog *child) __attribute__ ((noreturn));
456#endif
457static int run_pipe_real(struct pipe *pi);
458/* extended glob support: */
459#ifndef __U_BOOT__
460static int globhack(const char *src, int flags, glob_t *pglob);
461static int glob_needed(const char *s);
462static int xglob(o_string *dest, int flags, glob_t *pglob);
463#endif
464/* variable assignment: */
465static int is_assignment(const char *s);
466/* data structure manipulation: */
467#ifndef __U_BOOT__
468static int setup_redirect(struct p_context *ctx, int fd, redir_type style, struct in_str *input);
469#endif
470static void initialize_context(struct p_context *ctx);
471static int done_word(o_string *dest, struct p_context *ctx);
472static int done_command(struct p_context *ctx);
473static int done_pipe(struct p_context *ctx, pipe_style type);
474/* primary string parsing: */
475#ifndef __U_BOOT__
476static int redirect_dup_num(struct in_str *input);
477static int redirect_opt_num(o_string *o);
478static int process_command_subs(o_string *dest, struct p_context *ctx, struct in_str *input, int subst_end);
479static int parse_group(o_string *dest, struct p_context *ctx, struct in_str *input, int ch);
480#endif
481static char *lookup_param(char *src);
482static char *make_string(char **inp);
483static int handle_dollar(o_string *dest, struct p_context *ctx, struct in_str *input);
484#ifndef __U_BOOT__
485static int parse_string(o_string *dest, struct p_context *ctx, const char *src);
486#endif
487static int parse_stream(o_string *dest, struct p_context *ctx, struct in_str *input0, int end_trigger);
488/* setup: */
489static int parse_stream_outer(struct in_str *inp, int flag);
490#ifndef __U_BOOT__
491static int parse_string_outer(const char *s, int flag);
492static int parse_file_outer(FILE *f);
493#endif
494#ifndef __U_BOOT__
495/* job management: */
496static int checkjobs(struct pipe* fg_pipe);
497static void insert_bg_job(struct pipe *pi);
498static void remove_bg_job(struct pipe *pi);
499#endif
500/* local variable support */
501static char **make_list_in(char **inp, char *name);
502static char *insert_var_value(char *inp);
503static char *get_local_var(const char *var);
504#ifndef __U_BOOT__
505static void unset_local_var(const char *name);
506#endif
507static int set_local_var(const char *s, int flg_export);
508
509#ifndef __U_BOOT__
510/* Table of built-in functions. They can be forked or not, depending on
511 * context: within pipes, they fork. As simple commands, they do not.
512 * When used in non-forking context, they can change global variables
513 * in the parent shell process. If forked, of course they can not.
514 * For example, 'unset foo | whatever' will parse and run, but foo will
515 * still be set at the end. */
516static struct built_in_command bltins[] = {
517 {"bg", "Resume a job in the background", builtin_fg_bg},
518 {"break", "Exit for, while or until loop", builtin_not_written},
519 {"cd", "Change working directory", builtin_cd},
520 {"continue", "Continue for, while or until loop", builtin_not_written},
521 {"env", "Print all environment variables", builtin_env},
522 {"eval", "Construct and run shell command", builtin_eval},
523 {"exec", "Exec command, replacing this shell with the exec'd process",
524 builtin_exec},
525 {"exit", "Exit from shell()", builtin_exit},
526 {"export", "Set environment variable", builtin_export},
527 {"fg", "Bring job into the foreground", builtin_fg_bg},
528 {"jobs", "Lists the active jobs", builtin_jobs},
529 {"pwd", "Print current directory", builtin_pwd},
530 {"read", "Input environment variable", builtin_read},
531 {"return", "Return from a function", builtin_not_written},
532 {"set", "Set/unset shell local variables", builtin_set},
533 {"shift", "Shift positional parameters", builtin_shift},
534 {"trap", "Trap signals", builtin_not_written},
535 {"ulimit","Controls resource limits", builtin_not_written},
536 {"umask","Sets file creation mask", builtin_umask},
537 {"unset", "Unset environment variable", builtin_unset},
538 {".", "Source-in and run commands in a file", builtin_source},
539 {"help", "List shell built-in commands", builtin_help},
540 {NULL, NULL, NULL}
541};
542
543static const char *set_cwd(void)
544{
545 if(cwd==unknown)
546 cwd = NULL; /* xgetcwd(arg) called free(arg) */
547 cwd = xgetcwd((char *)cwd);
548 if (!cwd)
549 cwd = unknown;
550 return cwd;
551}
552
553/* built-in 'eval' handler */
554static int builtin_eval(struct child_prog *child)
555{
556 char *str = NULL;
557 int rcode = EXIT_SUCCESS;
558
559 if (child->argv[1]) {
560 str = make_string(child->argv + 1);
561 parse_string_outer(str, FLAG_EXIT_FROM_LOOP |
562 FLAG_PARSE_SEMICOLON);
563 free(str);
564 rcode = last_return_code;
565 }
566 return rcode;
567}
568
569/* built-in 'cd <path>' handler */
570static int builtin_cd(struct child_prog *child)
571{
572 char *newdir;
573 if (child->argv[1] == NULL)
574 newdir = getenv("HOME");
575 else
576 newdir = child->argv[1];
577 if (chdir(newdir)) {
578 printf("cd: %s: %s\n", newdir, strerror(errno));
579 return EXIT_FAILURE;
580 }
581 set_cwd();
582 return EXIT_SUCCESS;
583}
584
585/* built-in 'env' handler */
586static int builtin_env(struct child_prog *dummy)
587{
588 char **e = environ;
589 if (e == NULL) return EXIT_FAILURE;
590 for (; *e; e++) {
591 puts(*e);
592 }
593 return EXIT_SUCCESS;
594}
595
596/* built-in 'exec' handler */
597static int builtin_exec(struct child_prog *child)
598{
599 if (child->argv[1] == NULL)
600 return EXIT_SUCCESS; /* Really? */
601 child->argv++;
602 pseudo_exec(child);
603 /* never returns */
604}
605
606/* built-in 'exit' handler */
607static int builtin_exit(struct child_prog *child)
608{
609 if (child->argv[1] == NULL)
610 exit(last_return_code);
611 exit (atoi(child->argv[1]));
612}
613
614/* built-in 'export VAR=value' handler */
615static int builtin_export(struct child_prog *child)
616{
617 int res = 0;
618 char *name = child->argv[1];
619
620 if (name == NULL) {
621 return (builtin_env(child));
622 }
623
624 name = strdup(name);
625
626 if(name) {
627 char *value = strchr(name, '=');
628
629 if (!value) {
630 char *tmp;
631 /* They are exporting something without an =VALUE */
632
633 value = get_local_var(name);
634 if (value) {
635 size_t ln = strlen(name);
636
637 tmp = realloc(name, ln+strlen(value)+2);
638 if(tmp==NULL)
639 res = -1;
640 else {
641 sprintf(tmp+ln, "=%s", value);
642 name = tmp;
643 }
644 } else {
645 /* bash does not return an error when trying to export
646 * an undefined variable. Do likewise. */
647 res = 1;
648 }
649 }
650 }
651 if (res<0)
652 perror_msg("export");
653 else if(res==0)
654 res = set_local_var(name, 1);
655 else
656 res = 0;
657 free(name);
658 return res;
659}
660
661/* built-in 'fg' and 'bg' handler */
662static int builtin_fg_bg(struct child_prog *child)
663{
664 int i, jobnum;
665 struct pipe *pi=NULL;
666
667 if (!interactive)
668 return EXIT_FAILURE;
669 /* If they gave us no args, assume they want the last backgrounded task */
670 if (!child->argv[1]) {
671 for (pi = job_list; pi; pi = pi->next) {
672 if (pi->jobid == last_jobid) {
673 break;
674 }
675 }
676 if (!pi) {
677 error_msg("%s: no current job", child->argv[0]);
678 return EXIT_FAILURE;
679 }
680 } else {
681 if (sscanf(child->argv[1], "%%%d", &jobnum) != 1) {
682 error_msg("%s: bad argument '%s'", child->argv[0], child->argv[1]);
683 return EXIT_FAILURE;
684 }
685 for (pi = job_list; pi; pi = pi->next) {
686 if (pi->jobid == jobnum) {
687 break;
688 }
689 }
690 if (!pi) {
691 error_msg("%s: %d: no such job", child->argv[0], jobnum);
692 return EXIT_FAILURE;
693 }
694 }
695
696 if (*child->argv[0] == 'f') {
697 /* Put the job into the foreground. */
698 tcsetpgrp(shell_terminal, pi->pgrp);
699 }
700
701 /* Restart the processes in the job */
702 for (i = 0; i < pi->num_progs; i++)
703 pi->progs[i].is_stopped = 0;
704
705 if ( (i=kill(- pi->pgrp, SIGCONT)) < 0) {
706 if (i == ESRCH) {
707 remove_bg_job(pi);
708 } else {
709 perror_msg("kill (SIGCONT)");
710 }
711 }
712
713 pi->stopped_progs = 0;
714 return EXIT_SUCCESS;
715}
716
717/* built-in 'help' handler */
718static int builtin_help(struct child_prog *dummy)
719{
720 struct built_in_command *x;
721
722 printf("\nBuilt-in commands:\n");
723 printf("-------------------\n");
724 for (x = bltins; x->cmd; x++) {
725 if (x->descr==NULL)
726 continue;
727 printf("%s\t%s\n", x->cmd, x->descr);
728 }
729 printf("\n\n");
730 return EXIT_SUCCESS;
731}
732
733/* built-in 'jobs' handler */
734static int builtin_jobs(struct child_prog *child)
735{
736 struct pipe *job;
737 char *status_string;
738
739 for (job = job_list; job; job = job->next) {
740 if (job->running_progs == job->stopped_progs)
741 status_string = "Stopped";
742 else
743 status_string = "Running";
744
745 printf(JOB_STATUS_FORMAT, job->jobid, status_string, job->text);
746 }
747 return EXIT_SUCCESS;
748}
749
750
751/* built-in 'pwd' handler */
752static int builtin_pwd(struct child_prog *dummy)
753{
754 puts(set_cwd());
755 return EXIT_SUCCESS;
756}
757
758/* built-in 'read VAR' handler */
759static int builtin_read(struct child_prog *child)
760{
761 int res;
762
763 if (child->argv[1]) {
764 char string[BUFSIZ];
765 char *var = 0;
766
767 string[0] = 0; /* In case stdin has only EOF */
768 /* read string */
769 fgets(string, sizeof(string), stdin);
770 chomp(string);
771 var = malloc(strlen(child->argv[1])+strlen(string)+2);
772 if(var) {
773 sprintf(var, "%s=%s", child->argv[1], string);
774 res = set_local_var(var, 0);
775 } else
776 res = -1;
777 if (res)
778 fprintf(stderr, "read: %m\n");
779 free(var); /* So not move up to avoid breaking errno */
780 return res;
781 } else {
782 do res=getchar(); while(res!='\n' && res!=EOF);
783 return 0;
784 }
785}
786
787/* built-in 'set VAR=value' handler */
788static int builtin_set(struct child_prog *child)
789{
790 char *temp = child->argv[1];
791 struct variables *e;
792
793 if (temp == NULL)
794 for(e = top_vars; e; e=e->next)
795 printf("%s=%s\n", e->name, e->value);
796 else
797 set_local_var(temp, 0);
798
799 return EXIT_SUCCESS;
800}
801
802
803/* Built-in 'shift' handler */
804static int builtin_shift(struct child_prog *child)
805{
806 int n=1;
807 if (child->argv[1]) {
808 n=atoi(child->argv[1]);
809 }
810 if (n>=0 && n<global_argc) {
811 /* XXX This probably breaks $0 */
812 global_argc -= n;
813 global_argv += n;
814 return EXIT_SUCCESS;
815 } else {
816 return EXIT_FAILURE;
817 }
818}
819
820/* Built-in '.' handler (read-in and execute commands from file) */
821static int builtin_source(struct child_prog *child)
822{
823 FILE *input;
824 int status;
825
826 if (child->argv[1] == NULL)
827 return EXIT_FAILURE;
828
829 /* XXX search through $PATH is missing */
830 input = fopen(child->argv[1], "r");
831 if (!input) {
832 error_msg("Couldn't open file '%s'", child->argv[1]);
833 return EXIT_FAILURE;
834 }
835
836 /* Now run the file */
837 /* XXX argv and argc are broken; need to save old global_argv
838 * (pointer only is OK!) on this stack frame,
839 * set global_argv=child->argv+1, recurse, and restore. */
840 mark_open(fileno(input));
841 status = parse_file_outer(input);
842 mark_closed(fileno(input));
843 fclose(input);
844 return (status);
845}
846
847static int builtin_umask(struct child_prog *child)
848{
849 mode_t new_umask;
850 const char *arg = child->argv[1];
851 char *end;
852 if (arg) {
853 new_umask=strtoul(arg, &end, 8);
854 if (*end!='\0' || end == arg) {
855 return EXIT_FAILURE;
856 }
857 } else {
858 printf("%.3o\n", (unsigned int) (new_umask=umask(0)));
859 }
860 umask(new_umask);
861 return EXIT_SUCCESS;
862}
863
864/* built-in 'unset VAR' handler */
865static int builtin_unset(struct child_prog *child)
866{
867 /* bash returned already true */
868 unset_local_var(child->argv[1]);
869 return EXIT_SUCCESS;
870}
871
872static int builtin_not_written(struct child_prog *child)
873{
874 printf("builtin_%s not written\n",child->argv[0]);
875 return EXIT_FAILURE;
876}
877#endif
878
879static int b_check_space(o_string *o, int len)
880{
881 /* It would be easy to drop a more restrictive policy
882 * in here, such as setting a maximum string length */
883 if (o->length + len > o->maxlen) {
884 char *old_data = o->data;
885 /* assert (data == NULL || o->maxlen != 0); */
886 o->maxlen += max(2*len, B_CHUNK);
887 o->data = realloc(o->data, 1 + o->maxlen);
888 if (o->data == NULL) {
889 free(old_data);
890 }
891 }
892 return o->data == NULL;
893}
894
895static int b_addchr(o_string *o, int ch)
896{
897 debug_printf("b_addchr: %c %d %p\n", ch, o->length, o);
898 if (b_check_space(o, 1)) return B_NOSPAC;
899 o->data[o->length] = ch;
900 o->length++;
901 o->data[o->length] = '\0';
902 return 0;
903}
904
905static void b_reset(o_string *o)
906{
907 o->length = 0;
908 o->nonnull = 0;
909 if (o->data != NULL) *o->data = '\0';
910}
911
912static void b_free(o_string *o)
913{
914 b_reset(o);
d0fb80c3 915 free(o->data);
fe8c2806
WD		 916 o->data = NULL;
917 o->maxlen = 0;
918}
919
920/* My analysis of quoting semantics tells me that state information
921 * is associated with a destination, not a source.
922 */
923static int b_addqchr(o_string *o, int ch, int quote)
924{
925 if (quote && strchr("*?[\\",ch)) {
926 int rc;
927 rc = b_addchr(o, '\\');
928 if (rc) return rc;
929 }
930 return b_addchr(o, ch);
931}
932
933/* belongs in utility.c */
934char *simple_itoa(unsigned int i)
935{
936 /* 21 digits plus null terminator, good for 64-bit or smaller ints */
937 static char local[22];
938 char *p = &local[21];
939 *p-- = '\0';
940 do {
941 *p-- = '0' + i % 10;
942 i /= 10;
943 } while (i > 0);
944 return p + 1;
945}
946
c26e454d 947#ifndef __U_BOOT__
fe8c2806
WD		 948static int b_adduint(o_string *o, unsigned int i)
949{
950 int r;
951 char *p = simple_itoa(i);
952 /* no escape checking necessary */
953 do r=b_addchr(o, *p++); while (r==0 && *p);
954 return r;
955}
c26e454d 956#endif
fe8c2806
WD		 957
958static int static_get(struct in_str *i)
959{
d0ff51ba 960 int ch = *i->p++;
fe8c2806
WD		 961 if (ch=='\0') return EOF;
962 return ch;
963}
964
965static int static_peek(struct in_str *i)
966{
967 return *i->p;
968}
969
970#ifndef __U_BOOT__
971static inline void cmdedit_set_initial_prompt(void)
972{
d0fb80c3 973#ifndef CONFIG_FEATURE_SH_FANCY_PROMPT
fe8c2806
WD		 974 PS1 = NULL;
975#else
976 PS1 = getenv("PS1");
977 if(PS1==0)
978 PS1 = "\\w \\$ ";
979#endif
980}
981
982static inline void setup_prompt_string(int promptmode, char **prompt_str)
983{
984 debug_printf("setup_prompt_string %d ",promptmode);
d0fb80c3 985#ifndef CONFIG_FEATURE_SH_FANCY_PROMPT
fe8c2806
WD		 986 /* Set up the prompt */
987 if (promptmode == 1) {
d0fb80c3 988 free(PS1);
fe8c2806
WD		 989 PS1=xmalloc(strlen(cwd)+4);
990 sprintf(PS1, "%s %s", cwd, ( geteuid() != 0 ) ? "$ ":"# ");
991 *prompt_str = PS1;
992 } else {
993 *prompt_str = PS2;
994 }
995#else
996 *prompt_str = (promptmode==1)? PS1 : PS2;
997#endif
998 debug_printf("result %s\n",*prompt_str);
999}
1000#endif
1001
1002static void get_user_input(struct in_str *i)
1003{
1004#ifndef __U_BOOT__
1005 char *prompt_str;
1006 static char the_command[BUFSIZ];
1007
1008 setup_prompt_string(i->promptmode, &prompt_str);
d0fb80c3 1009#ifdef CONFIG_FEATURE_COMMAND_EDITING
fe8c2806
WD		 1010 /*
1011 ** enable command line editing only while a command line
1012 ** is actually being read; otherwise, we'll end up bequeathing
1013 ** atexit() handlers and other unwanted stuff to our
1014 ** child processes (rob@sysgo.de)
1015 */
1016 cmdedit_read_input(prompt_str, the_command);
1017#else
1018 fputs(prompt_str, stdout);
1019 fflush(stdout);
1020 the_command[0]=fgetc(i->file);
1021 the_command[1]='\0';
1022#endif
1023 fflush(stdout);
1024 i->p = the_command;
1025#else
1026 extern char console_buffer[CFG_CBSIZE];
1027 int n;
1028 static char the_command[CFG_CBSIZE];
1029
396387ab
WD		 1030#ifdef CONFIG_BOOT_RETRY_TIME
1031# ifdef CONFIG_RESET_TO_RETRY
1032 extern int do_reset (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]);
1033# else
1034# error "This currently only works with CONFIG_RESET_TO_RETRY enabled"
1035# endif
1036 reset_cmd_timeout();
1037#endif
fe8c2806
WD		 1038 i->__promptme = 1;
1039 if (i->promptmode == 1) {
1040 n = readline(CFG_PROMPT);
1041 } else {
1042 n = readline(CFG_PROMPT_HUSH_PS2);
1043 }
396387ab
WD		 1044#ifdef CONFIG_BOOT_RETRY_TIME
1045 if (n == -2) {
1046 puts("\nTimeout waiting for command\n");
1047# ifdef CONFIG_RESET_TO_RETRY
1048 do_reset(NULL, 0, 0, NULL);
1049# else
1050# error "This currently only works with CONFIG_RESET_TO_RETRY enabled"
1051# endif
1052 }
1053#endif
fe8c2806
WD		 1054 if (n == -1 ) {
1055 flag_repeat = 0;
1056 i->__promptme = 0;
1057 }
1058 n = strlen(console_buffer);
1059 console_buffer[n] = '\n';
1060 console_buffer[n+1]= '\0';
1061 if (had_ctrlc()) flag_repeat = 0;
1062 clear_ctrlc();
1063 do_repeat = 0;
1064 if (i->promptmode == 1) {
1065 if (console_buffer[0] == '\n'&& flag_repeat == 0) {
1066 strcpy(the_command,console_buffer);
1067 }
1068 else {
1069 if (console_buffer[0] != '\n') {
1070 strcpy(the_command,console_buffer);
1071 flag_repeat = 1;
1072 }
1073 else {
1074 do_repeat = 1;
1075 }
1076 }
1077 i->p = the_command;
1078 }
1079 else {
8bde7f77
WD		 1080 if (console_buffer[0] != '\n') {
1081 if (strlen(the_command) + strlen(console_buffer)
fe8c2806 1082 < CFG_CBSIZE) {
8bde7f77
WD		 1083 n = strlen(the_command);
1084 the_command[n-1] = ' ';
1085 strcpy(&the_command[n],console_buffer);
fe8c2806
WD		 1086 }
1087 else {
1088 the_command[0] = '\n';
1089 the_command[1] = '\0';
1090 flag_repeat = 0;
1091 }
1092 }
1093 if (i->__promptme == 0) {
1094 the_command[0] = '\n';
1095 the_command[1] = '\0';
1096 }
1097 i->p = console_buffer;
1098 }
1099#endif
1100}
1101
1102/* This is the magic location that prints prompts
1103 * and gets data back from the user */
1104static int file_get(struct in_str *i)
1105{
1106 int ch;
1107
1108 ch = 0;
1109 /* If there is data waiting, eat it up */
1110 if (i->p && *i->p) {
d0ff51ba 1111 ch = *i->p++;
fe8c2806
WD		 1112 } else {
1113 /* need to double check i->file because we might be doing something
1114 * more complicated by now, like sourcing or substituting. */
1115#ifndef __U_BOOT__
1116 if (i->__promptme && interactive && i->file == stdin) {
1117 while(! i->p || (interactive && strlen(i->p)==0) ) {
1118#else
1119 while(! i->p || strlen(i->p)==0 ) {
1120#endif
1121 get_user_input(i);
1122 }
1123 i->promptmode=2;
1124#ifndef __U_BOOT__
1125 i->__promptme = 0;
1126#endif
1127 if (i->p && *i->p) {
d0ff51ba 1128 ch = *i->p++;
fe8c2806
WD		 1129 }
1130#ifndef __U_BOOT__
1131 } else {
1132 ch = fgetc(i->file);
1133 }
1134
1135#endif
1136 debug_printf("b_getch: got a %d\n", ch);
1137 }
1138#ifndef __U_BOOT__
1139 if (ch == '\n') i->__promptme=1;
1140#endif
1141 return ch;
1142}
1143
1144/* All the callers guarantee this routine will never be
1145 * used right after a newline, so prompting is not needed.
1146 */
1147static int file_peek(struct in_str *i)
1148{
1149#ifndef __U_BOOT__
1150 if (i->p && *i->p) {
1151#endif
1152 return *i->p;
1153#ifndef __U_BOOT__
1154 } else {
1155 i->peek_buf[0] = fgetc(i->file);
1156 i->peek_buf[1] = '\0';
1157 i->p = i->peek_buf;
1158 debug_printf("b_peek: got a %d\n", *i->p);
1159 return *i->p;
1160 }
1161#endif
1162}
1163
1164#ifndef __U_BOOT__
1165static void setup_file_in_str(struct in_str *i, FILE *f)
1166#else
1167static void setup_file_in_str(struct in_str *i)
1168#endif
1169{
1170 i->peek = file_peek;
1171 i->get = file_get;
1172 i->__promptme=1;
1173 i->promptmode=1;
1174#ifndef __U_BOOT__
1175 i->file = f;
1176#endif
1177 i->p = NULL;
1178}
1179
1180static void setup_string_in_str(struct in_str *i, const char *s)
1181{
1182 i->peek = static_peek;
1183 i->get = static_get;
1184 i->__promptme=1;
1185 i->promptmode=1;
1186 i->p = s;
1187}
1188
1189#ifndef __U_BOOT__
1190static void mark_open(int fd)
1191{
1192 struct close_me *new = xmalloc(sizeof(struct close_me));
1193 new->fd = fd;
1194 new->next = close_me_head;
1195 close_me_head = new;
1196}
1197
1198static void mark_closed(int fd)
1199{
1200 struct close_me *tmp;
1201 if (close_me_head == NULL || close_me_head->fd != fd)
1202 error_msg_and_die("corrupt close_me");
1203 tmp = close_me_head;
1204 close_me_head = close_me_head->next;
1205 free(tmp);
1206}
1207
d0fb80c3 1208static void close_all(void)
fe8c2806
WD		 1209{
1210 struct close_me *c;
1211 for (c=close_me_head; c; c=c->next) {
1212 close(c->fd);
1213 }
1214 close_me_head = NULL;
1215}
1216
1217/* squirrel != NULL means we squirrel away copies of stdin, stdout,
1218 * and stderr if they are redirected. */
1219static int setup_redirects(struct child_prog *prog, int squirrel[])
1220{
1221 int openfd, mode;
1222 struct redir_struct *redir;
1223
1224 for (redir=prog->redirects; redir; redir=redir->next) {
1225 if (redir->dup == -1 && redir->word.gl_pathv == NULL) {
1226 /* something went wrong in the parse. Pretend it didn't happen */
1227 continue;
1228 }
1229 if (redir->dup == -1) {
1230 mode=redir_table[redir->type].mode;
1231 openfd = open(redir->word.gl_pathv[0], mode, 0666);
1232 if (openfd < 0) {
1233 /* this could get lost if stderr has been redirected, but
1234 bash and ash both lose it as well (though zsh doesn't!) */
1235 perror_msg("error opening %s", redir->word.gl_pathv[0]);
1236 return 1;
1237 }
1238 } else {
1239 openfd = redir->dup;
1240 }
1241
1242 if (openfd != redir->fd) {
1243 if (squirrel && redir->fd < 3) {
1244 squirrel[redir->fd] = dup(redir->fd);
1245 }
1246 if (openfd == -3) {
1247 close(openfd);
1248 } else {
1249 dup2(openfd, redir->fd);
1250 if (redir->dup == -1)
1251 close (openfd);
1252 }
1253 }
1254 }
1255 return 0;
1256}
1257
1258static void restore_redirects(int squirrel[])
1259{
1260 int i, fd;
1261 for (i=0; i<3; i++) {
1262 fd = squirrel[i];
1263 if (fd != -1) {
1264 /* No error checking. I sure wouldn't know what
1265 * to do with an error if I found one! */
1266 dup2(fd, i);
1267 close(fd);
1268 }
1269 }
1270}
1271
1272/* never returns */
1273/* XXX no exit() here. If you don't exec, use _exit instead.
1274 * The at_exit handlers apparently confuse the calling process,
1275 * in particular stdin handling. Not sure why? */
1276static void pseudo_exec(struct child_prog *child)
1277{
1278 int i, rcode;
1279 char *p;
1280 struct built_in_command *x;
1281 if (child->argv) {
1282 for (i=0; is_assignment(child->argv[i]); i++) {
1283 debug_printf("pid %d environment modification: %s\n",getpid(),child->argv[i]);
1284 p = insert_var_value(child->argv[i]);
1285 putenv(strdup(p));
1286 if (p != child->argv[i]) free(p);
1287 }
1288 child->argv+=i; /* XXX this hack isn't so horrible, since we are about
8bde7f77
WD		 1289 to exit, and therefore don't need to keep data
1290 structures consistent for free() use. */
fe8c2806
WD		 1291 /* If a variable is assigned in a forest, and nobody listens,
1292 * was it ever really set?
1293 */
1294 if (child->argv[0] == NULL) {
1295 _exit(EXIT_SUCCESS);
1296 }
1297
1298 /*
1299 * Check if the command matches any of the builtins.
1300 * Depending on context, this might be redundant. But it's
1301 * easier to waste a few CPU cycles than it is to figure out
1302 * if this is one of those cases.
1303 */
1304 for (x = bltins; x->cmd; x++) {
1305 if (strcmp(child->argv[0], x->cmd) == 0 ) {
1306 debug_printf("builtin exec %s\n", child->argv[0]);
1307 rcode = x->function(child);
1308 fflush(stdout);
1309 _exit(rcode);
1310 }
1311 }
1312
1313 /* Check if the command matches any busybox internal commands
1314 * ("applets") here.
1315 * FIXME: This feature is not 100% safe, since
1316 * BusyBox is not fully reentrant, so we have no guarantee the things
1317 * from the .bss are still zeroed, or that things from .data are still
1318 * at their defaults. We could exec ourself from /proc/self/exe, but I
1319 * really dislike relying on /proc for things. We could exec ourself
1320 * from global_argv[0], but if we are in a chroot, we may not be able
1321 * to find ourself... */
d0fb80c3 1322#ifdef CONFIG_FEATURE_SH_STANDALONE_SHELL
fe8c2806
WD		 1323 {
1324 int argc_l;
1325 char** argv_l=child->argv;
1326 char *name = child->argv[0];
1327
d0fb80c3 1328#ifdef CONFIG_FEATURE_SH_APPLETS_ALWAYS_WIN
fe8c2806
WD		 1329 /* Following discussions from November 2000 on the busybox mailing
1330 * list, the default configuration, (without
1331 * get_last_path_component()) lets the user force use of an
1332 * external command by specifying the full (with slashes) filename.
d0fb80c3 1333 * If you enable CONFIG_FEATURE_SH_APPLETS_ALWAYS_WIN then applets
fe8c2806
WD		 1334 * _aways_ override external commands, so if you want to run
1335 * /bin/cat, it will use BusyBox cat even if /bin/cat exists on the
1336 * filesystem and is _not_ busybox. Some systems may want this,
1337 * most do not. */
1338 name = get_last_path_component(name);
1339#endif
1340 /* Count argc for use in a second... */
1341 for(argc_l=0;*argv_l!=NULL; argv_l++, argc_l++);
1342 optind = 1;
1343 debug_printf("running applet %s\n", name);
1344 run_applet_by_name(name, argc_l, child->argv);
1345 }
1346#endif
1347 debug_printf("exec of %s\n",child->argv[0]);
1348 execvp(child->argv[0],child->argv);
1349 perror_msg("couldn't exec: %s",child->argv[0]);
1350 _exit(1);
1351 } else if (child->group) {
1352 debug_printf("runtime nesting to group\n");
1353 interactive=0; /* crucial!!!! */
1354 rcode = run_list_real(child->group);
1355 /* OK to leak memory by not calling free_pipe_list,
1356 * since this process is about to exit */
1357 _exit(rcode);
1358 } else {
1359 /* Can happen. See what bash does with ">foo" by itself. */
1360 debug_printf("trying to pseudo_exec null command\n");
1361 _exit(EXIT_SUCCESS);
1362 }
1363}
1364
1365static void insert_bg_job(struct pipe *pi)
1366{
1367 struct pipe *thejob;
1368
1369 /* Linear search for the ID of the job to use */
1370 pi->jobid = 1;
1371 for (thejob = job_list; thejob; thejob = thejob->next)
1372 if (thejob->jobid >= pi->jobid)
1373 pi->jobid = thejob->jobid + 1;
1374
1375 /* add thejob to the list of running jobs */
1376 if (!job_list) {
1377 thejob = job_list = xmalloc(sizeof(*thejob));
1378 } else {
1379 for (thejob = job_list; thejob->next; thejob = thejob->next) /* nothing */;
1380 thejob->next = xmalloc(sizeof(*thejob));
1381 thejob = thejob->next;
1382 }
1383
1384 /* physically copy the struct job */
1385 memcpy(thejob, pi, sizeof(struct pipe));
1386 thejob->next = NULL;
1387 thejob->running_progs = thejob->num_progs;
1388 thejob->stopped_progs = 0;
1389 thejob->text = xmalloc(BUFSIZ); /* cmdedit buffer size */
1390
1391 /*if (pi->progs[0] && pi->progs[0].argv && pi->progs[0].argv[0]) */
1392 {
1393 char *bar=thejob->text;
1394 char **foo=pi->progs[0].argv;
1395 while(foo && *foo) {
1396 bar += sprintf(bar, "%s ", *foo++);
1397 }
1398 }
1399
1400 /* we don't wait for background thejobs to return -- append it
1401 to the list of backgrounded thejobs and leave it alone */
1402 printf("[%d] %d\n", thejob->jobid, thejob->progs[0].pid);
1403 last_bg_pid = thejob->progs[0].pid;
1404 last_jobid = thejob->jobid;
1405}
1406
1407/* remove a backgrounded job */
1408static void remove_bg_job(struct pipe *pi)
1409{
1410 struct pipe *prev_pipe;
1411
1412 if (pi == job_list) {
1413 job_list = pi->next;
1414 } else {
1415 prev_pipe = job_list;
1416 while (prev_pipe->next != pi)
1417 prev_pipe = prev_pipe->next;
1418 prev_pipe->next = pi->next;
1419 }
1420 if (job_list)
1421 last_jobid = job_list->jobid;
1422 else
1423 last_jobid = 0;
1424
1425 pi->stopped_progs = 0;
1426 free_pipe(pi, 0);
1427 free(pi);
1428}
1429
1430/* Checks to see if any processes have exited -- if they
1431 have, figure out why and see if a job has completed */
1432static int checkjobs(struct pipe* fg_pipe)
1433{
1434 int attributes;
1435 int status;
1436 int prognum = 0;
1437 struct pipe *pi;
1438 pid_t childpid;
1439
1440 attributes = WUNTRACED;
1441 if (fg_pipe==NULL) {
1442 attributes |= WNOHANG;
1443 }
1444
1445 while ((childpid = waitpid(-1, &status, attributes)) > 0) {
1446 if (fg_pipe) {
1447 int i, rcode = 0;
1448 for (i=0; i < fg_pipe->num_progs; i++) {
1449 if (fg_pipe->progs[i].pid == childpid) {
1450 if (i==fg_pipe->num_progs-1)
1451 rcode=WEXITSTATUS(status);
1452 (fg_pipe->num_progs)--;
1453 return(rcode);
1454 }
1455 }
1456 }
1457
1458 for (pi = job_list; pi; pi = pi->next) {
1459 prognum = 0;
1460 while (prognum < pi->num_progs && pi->progs[prognum].pid != childpid) {
1461 prognum++;
1462 }
1463 if (prognum < pi->num_progs)
1464 break;
1465 }
1466
1467 if(pi==NULL) {
1468 debug_printf("checkjobs: pid %d was not in our list!\n", childpid);
1469 continue;
1470 }
1471
1472 if (WIFEXITED(status) || WIFSIGNALED(status)) {
1473 /* child exited */
1474 pi->running_progs--;
1475 pi->progs[prognum].pid = 0;
1476
1477 if (!pi->running_progs) {
1478 printf(JOB_STATUS_FORMAT, pi->jobid, "Done", pi->text);
1479 remove_bg_job(pi);
1480 }
1481 } else {
1482 /* child stopped */
1483 pi->stopped_progs++;
1484 pi->progs[prognum].is_stopped = 1;
1485
1486#if 0
1487 /* Printing this stuff is a pain, since it tends to
1488 * overwrite the prompt an inconveinient moments. So
1489 * don't do that. */
1490 if (pi->stopped_progs == pi->num_progs) {
1491 printf("\n"JOB_STATUS_FORMAT, pi->jobid, "Stopped", pi->text);
1492 }
1493#endif
1494 }
1495 }
1496
1497 if (childpid == -1 && errno != ECHILD)
1498 perror_msg("waitpid");
1499
1500 /* move the shell to the foreground */
1501 /*if (interactive && tcsetpgrp(shell_terminal, getpgid(0))) */
1502 /* perror_msg("tcsetpgrp-2"); */
1503 return -1;
1504}
1505
1506/* Figure out our controlling tty, checking in order stderr,
1507 * stdin, and stdout. If check_pgrp is set, also check that
1508 * we belong to the foreground process group associated with
1509 * that tty. The value of shell_terminal is needed in order to call
1510 * tcsetpgrp(shell_terminal, ...); */
1511void controlling_tty(int check_pgrp)
1512{
1513 pid_t curpgrp;
1514
1515 if ((curpgrp = tcgetpgrp(shell_terminal = 2)) < 0
1516 && (curpgrp = tcgetpgrp(shell_terminal = 0)) < 0
1517 && (curpgrp = tcgetpgrp(shell_terminal = 1)) < 0)
1518 goto shell_terminal_error;
1519
1520 if (check_pgrp && curpgrp != getpgid(0))
1521 goto shell_terminal_error;
1522
1523 return;
1524
1525shell_terminal_error:
1526 shell_terminal = -1;
1527 return;
1528}
1529#endif
1530
1531/* run_pipe_real() starts all the jobs, but doesn't wait for anything
1532 * to finish. See checkjobs().
1533 *
1534 * return code is normally -1, when the caller has to wait for children
1535 * to finish to determine the exit status of the pipe. If the pipe
1536 * is a simple builtin command, however, the action is done by the
1537 * time run_pipe_real returns, and the exit code is provided as the
1538 * return value.
1539 *
1540 * The input of the pipe is always stdin, the output is always
1541 * stdout. The outpipe[] mechanism in BusyBox-0.48 lash is bogus,
1542 * because it tries to avoid running the command substitution in
1543 * subshell, when that is in fact necessary. The subshell process
1544 * now has its stdout directed to the input of the appropriate pipe,
1545 * so this routine is noticeably simpler.
1546 */
1547static int run_pipe_real(struct pipe *pi)
1548{
1549 int i;
1550#ifndef __U_BOOT__
1551 int nextin, nextout;
1552 int pipefds[2]; /* pipefds[0] is for reading */
1553 struct child_prog *child;
1554 struct built_in_command *x;
1555 char *p;
d0fb80c3
WD		 1556# if __GNUC__
1557 /* Avoid longjmp clobbering */
1558 (void) &i;
1559 (void) &nextin;
1560 (void) &nextout;
1561 (void) &child;
1562# endif
fe8c2806
WD		 1563#else
1564 int nextin;
1565 int flag = do_repeat ? CMD_FLAG_REPEAT : 0;
1566 struct child_prog *child;
1567 cmd_tbl_t *cmdtp;
1568 char *p;
d0fb80c3
WD		 1569# if __GNUC__
1570 /* Avoid longjmp clobbering */
1571 (void) &i;
1572 (void) &nextin;
1573 (void) &child;
1574# endif
1575#endif /* __U_BOOT__ */
fe8c2806
WD		 1576
1577 nextin = 0;
1578#ifndef __U_BOOT__
1579 pi->pgrp = -1;
1580#endif
1581
1582 /* Check if this is a simple builtin (not part of a pipe).
1583 * Builtins within pipes have to fork anyway, and are handled in
1584 * pseudo_exec. "echo foo | read bar" doesn't work on bash, either.
1585 */
1586 if (pi->num_progs == 1) child = & (pi->progs[0]);
1587#ifndef __U_BOOT__
1588 if (pi->num_progs == 1 && child->group && child->subshell == 0) {
1589 int squirrel[] = {-1, -1, -1};
1590 int rcode;
1591 debug_printf("non-subshell grouping\n");
1592 setup_redirects(child, squirrel);
1593 /* XXX could we merge code with following builtin case,
1594 * by creating a pseudo builtin that calls run_list_real? */
1595 rcode = run_list_real(child->group);
1596 restore_redirects(squirrel);
1597#else
1598 if (pi->num_progs == 1 && child->group) {
1599 int rcode;
1600 debug_printf("non-subshell grouping\n");
1601 rcode = run_list_real(child->group);
1602#endif
1603 return rcode;
1604 } else if (pi->num_progs == 1 && pi->progs[0].argv != NULL) {
1605 for (i=0; is_assignment(child->argv[i]); i++) { /* nothing */ }
1606 if (i!=0 && child->argv[i]==NULL) {
1607 /* assignments, but no command: set the local environment */
1608 for (i=0; child->argv[i]!=NULL; i++) {
1609
1610 /* Ok, this case is tricky. We have to decide if this is a
1611 * local variable, or an already exported variable. If it is
1612 * already exported, we have to export the new value. If it is
1613 * not exported, we need only set this as a local variable.
1614 * This junk is all to decide whether or not to export this
1615 * variable. */
1616 int export_me=0;
1617 char *name, *value;
1618 name = xstrdup(child->argv[i]);
1619 debug_printf("Local environment set: %s\n", name);
1620 value = strchr(name, '=');
1621 if (value)
1622 *value=0;
1623#ifndef __U_BOOT__
1624 if ( get_local_var(name)) {
1625 export_me=1;
1626 }
1627#endif
1628 free(name);
1629 p = insert_var_value(child->argv[i]);
1630 set_local_var(p, export_me);
1631 if (p != child->argv[i]) free(p);
1632 }
1633 return EXIT_SUCCESS; /* don't worry about errors in set_local_var() yet */
1634 }
1635 for (i = 0; is_assignment(child->argv[i]); i++) {
1636 p = insert_var_value(child->argv[i]);
1637#ifndef __U_BOOT__
1638 putenv(strdup(p));
1639#else
1640 set_local_var(p, 0);
1641#endif
1642 if (p != child->argv[i]) {
1643 child->sp--;
1644 free(p);
1645 }
1646 }
1647 if (child->sp) {
1648 char * str = NULL;
1649
1650 str = make_string((child->argv + i));
1651 parse_string_outer(str, FLAG_EXIT_FROM_LOOP | FLAG_REPARSING);
1652 free(str);
1653 return last_return_code;
1654 }
1655#ifndef __U_BOOT__
1656 for (x = bltins; x->cmd; x++) {
1657 if (strcmp(child->argv[i], x->cmd) == 0 ) {
1658 int squirrel[] = {-1, -1, -1};
1659 int rcode;
1660 if (x->function == builtin_exec && child->argv[i+1]==NULL) {
1661 debug_printf("magic exec\n");
1662 setup_redirects(child,NULL);
1663 return EXIT_SUCCESS;
1664 }
1665 debug_printf("builtin inline %s\n", child->argv[0]);
1666 /* XXX setup_redirects acts on file descriptors, not FILEs.
1667 * This is perfect for work that comes after exec().
1668 * Is it really safe for inline use? Experimentally,
1669 * things seem to work with glibc. */
1670 setup_redirects(child, squirrel);
1671#else
1672 /* check ";", because ,example , argv consist from
1673 * "help;flinfo" must not execute
1674 */
1675 if (strchr(child->argv[i], ';')) {
1676 printf ("Unknown command '%s' - try 'help' or use 'run' command\n",
1677 child->argv[i]);
1678 return -1;
1679 }
8bde7f77
WD		 1680 /* Look up command in command table */
1681
1682
fe8c2806
WD		 1683 if ((cmdtp = find_cmd(child->argv[i])) == NULL) {
1684 printf ("Unknown command '%s' - try 'help'\n", child->argv[i]);
1685 return -1; /* give up after bad command */
1686 } else {
1687 int rcode;
c3517f91 1688#if defined(CONFIG_CMD_BOOTD)
8bde7f77
WD		 1689 extern int do_bootd (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]);
1690
1691 /* avoid "bootd" recursion */
fe8c2806
WD		 1692 if (cmdtp->cmd == do_bootd) {
1693 if (flag & CMD_FLAG_BOOTD) {
1694 printf ("'bootd' recursion detected\n");
1695 return -1;
1696 }
1697 else
1698 flag |= CMD_FLAG_BOOTD;
1699 }
90253178 1700#endif
8bde7f77 1701 /* found - check max args */
fe8c2806
WD		 1702 if ((child->argc - i) > cmdtp->maxargs) {
1703 printf ("Usage:\n%s\n", cmdtp->usage);
1704 return -1;
1705 }
1706#endif
1707 child->argv+=i; /* XXX horrible hack */
1708#ifndef __U_BOOT__
1709 rcode = x->function(child);
1710#else
1711 /* OK - call function to do the command */
8bde7f77 1712
fe8c2806 1713 rcode = (cmdtp->cmd)
8bde7f77 1714(cmdtp, flag,child->argc-i,&child->argv[i]);
fe8c2806
WD		 1715 if ( !cmdtp->repeatable )
1716 flag_repeat = 0;
8bde7f77
WD		 1717
1718
fe8c2806
WD		 1719#endif
1720 child->argv-=i; /* XXX restore hack so free() can work right */
1721#ifndef __U_BOOT__
8bde7f77 1722
fe8c2806
WD		 1723 restore_redirects(squirrel);
1724#endif
8bde7f77 1725
fe8c2806
WD		 1726 return rcode;
1727 }
1728 }
1729#ifndef __U_BOOT__
1730 }
1731
1732 for (i = 0; i < pi->num_progs; i++) {
1733 child = & (pi->progs[i]);
1734
1735 /* pipes are inserted between pairs of commands */
1736 if ((i + 1) < pi->num_progs) {
1737 if (pipe(pipefds)<0) perror_msg_and_die("pipe");
1738 nextout = pipefds[1];
1739 } else {
1740 nextout=1;
1741 pipefds[0] = -1;
1742 }
1743
1744 /* XXX test for failed fork()? */
1745 if (!(child->pid = fork())) {
1746 /* Set the handling for job control signals back to the default. */
1747 signal(SIGINT, SIG_DFL);
1748 signal(SIGQUIT, SIG_DFL);
1749 signal(SIGTERM, SIG_DFL);
1750 signal(SIGTSTP, SIG_DFL);
1751 signal(SIGTTIN, SIG_DFL);
1752 signal(SIGTTOU, SIG_DFL);
1753 signal(SIGCHLD, SIG_DFL);
1754
1755 close_all();
1756
1757 if (nextin != 0) {
1758 dup2(nextin, 0);
1759 close(nextin);
1760 }
1761 if (nextout != 1) {
1762 dup2(nextout, 1);
1763 close(nextout);
1764 }
1765 if (pipefds[0]!=-1) {
1766 close(pipefds[0]); /* opposite end of our output pipe */
1767 }
1768
1769 /* Like bash, explicit redirects override pipes,
1770 * and the pipe fd is available for dup'ing. */
1771 setup_redirects(child,NULL);
1772
1773 if (interactive && pi->followup!=PIPE_BG) {
1774 /* If we (the child) win the race, put ourselves in the process
1775 * group whose leader is the first process in this pipe. */
1776 if (pi->pgrp < 0) {
1777 pi->pgrp = getpid();
1778 }
1779 if (setpgid(0, pi->pgrp) == 0) {
1780 tcsetpgrp(2, pi->pgrp);
1781 }
1782 }
1783
1784 pseudo_exec(child);
1785 }
1786
1787
1788 /* put our child in the process group whose leader is the
1789 first process in this pipe */
1790 if (pi->pgrp < 0) {
1791 pi->pgrp = child->pid;
1792 }
1793 /* Don't check for errors. The child may be dead already,
1794 * in which case setpgid returns error code EACCES. */
1795 setpgid(child->pid, pi->pgrp);
1796
1797 if (nextin != 0)
1798 close(nextin);
1799 if (nextout != 1)
1800 close(nextout);
1801
1802 /* If there isn't another process, nextin is garbage
1803 but it doesn't matter */
1804 nextin = pipefds[0];
1805 }
1806#endif
1807 return -1;
1808}
1809
1810static int run_list_real(struct pipe *pi)
1811{
1812 char *save_name = NULL;
1813 char **list = NULL;
1814 char **save_list = NULL;
1815 struct pipe *rpipe;
1816 int flag_rep = 0;
1817#ifndef __U_BOOT__
1818 int save_num_progs;
1819#endif
1820 int rcode=0, flag_skip=1;
1821 int flag_restore = 0;
1822 int if_code=0, next_if_code=0; /* need double-buffer to handle elif */
1823 reserved_style rmode, skip_more_in_this_rmode=RES_XXXX;
1824 /* check syntax for "for" */
1825 for (rpipe = pi; rpipe; rpipe = rpipe->next) {
1826 if ((rpipe->r_mode == RES_IN ||
1827 rpipe->r_mode == RES_FOR) &&
1828 (rpipe->next == NULL)) {
1829 syntax();
1830#ifdef __U_BOOT__
1831 flag_repeat = 0;
1832#endif
1833 return 1;
1834 }
1835 if ((rpipe->r_mode == RES_IN &&
1836 (rpipe->next->r_mode == RES_IN &&
1837 rpipe->next->progs->argv != NULL))||
1838 (rpipe->r_mode == RES_FOR &&
1839 rpipe->next->r_mode != RES_IN)) {
1840 syntax();
1841#ifdef __U_BOOT__
1842 flag_repeat = 0;
1843#endif
1844 return 1;
1845 }
1846 }
1847 for (; pi; pi = (flag_restore != 0) ? rpipe : pi->next) {
1848 if (pi->r_mode == RES_WHILE || pi->r_mode == RES_UNTIL ||
1849 pi->r_mode == RES_FOR) {
1850#ifdef __U_BOOT__
1851 /* check Ctrl-C */
1852 ctrlc();
1853 if ((had_ctrlc())) {
1854 return 1;
1855 }
1856#endif
1857 flag_restore = 0;
1858 if (!rpipe) {
1859 flag_rep = 0;
1860 rpipe = pi;
1861 }
1862 }
1863 rmode = pi->r_mode;
1864 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);
1865 if (rmode == skip_more_in_this_rmode && flag_skip) {
1866 if (pi->followup == PIPE_SEQ) flag_skip=0;
1867 continue;
1868 }
1869 flag_skip = 1;
1870 skip_more_in_this_rmode = RES_XXXX;
1871 if (rmode == RES_THEN || rmode == RES_ELSE) if_code = next_if_code;
1872 if (rmode == RES_THEN && if_code) continue;
1873 if (rmode == RES_ELSE && !if_code) continue;
56b86bf0 1874 if (rmode == RES_ELIF && !if_code) break;
fe8c2806
WD		 1875 if (rmode == RES_FOR && pi->num_progs) {
1876 if (!list) {
1877 /* if no variable values after "in" we skip "for" */
1878 if (!pi->next->progs->argv) continue;
1879 /* create list of variable values */
1880 list = make_list_in(pi->next->progs->argv,
1881 pi->progs->argv[0]);
1882 save_list = list;
1883 save_name = pi->progs->argv[0];
1884 pi->progs->argv[0] = NULL;
1885 flag_rep = 1;
1886 }
1887 if (!(*list)) {
1888 free(pi->progs->argv[0]);
1889 free(save_list);
1890 list = NULL;
1891 flag_rep = 0;
1892 pi->progs->argv[0] = save_name;
1893#ifndef __U_BOOT__
1894 pi->progs->glob_result.gl_pathv[0] =
1895 pi->progs->argv[0];
1896#endif
1897 continue;
1898 } else {
1899 /* insert new value from list for variable */
1900 if (pi->progs->argv[0])
1901 free(pi->progs->argv[0]);
1902 pi->progs->argv[0] = *list++;
1903#ifndef __U_BOOT__
1904 pi->progs->glob_result.gl_pathv[0] =
1905 pi->progs->argv[0];
1906#endif
1907 }
1908 }
1909 if (rmode == RES_IN) continue;
1910 if (rmode == RES_DO) {
1911 if (!flag_rep) continue;
1912 }
1913 if ((rmode == RES_DONE)) {
1914 if (flag_rep) {
1915 flag_restore = 1;
1916 } else {
1917 rpipe = NULL;
1918 }
1919 }
1920 if (pi->num_progs == 0) continue;
1921#ifndef __U_BOOT__
1922 save_num_progs = pi->num_progs; /* save number of programs */
1923#endif
1924 rcode = run_pipe_real(pi);
1925 debug_printf("run_pipe_real returned %d\n",rcode);
1926#ifndef __U_BOOT__
1927 if (rcode!=-1) {
1928 /* We only ran a builtin: rcode was set by the return value
1929 * of run_pipe_real(), and we don't need to wait for anything. */
1930 } else if (pi->followup==PIPE_BG) {
1931 /* XXX check bash's behavior with nontrivial pipes */
1932 /* XXX compute jobid */
1933 /* XXX what does bash do with attempts to background builtins? */
1934 insert_bg_job(pi);
1935 rcode = EXIT_SUCCESS;
1936 } else {
1937 if (interactive) {
1938 /* move the new process group into the foreground */
1939 if (tcsetpgrp(shell_terminal, pi->pgrp) && errno != ENOTTY)
1940 perror_msg("tcsetpgrp-3");
1941 rcode = checkjobs(pi);
1942 /* move the shell to the foreground */
1943 if (tcsetpgrp(shell_terminal, getpgid(0)) && errno != ENOTTY)
1944 perror_msg("tcsetpgrp-4");
1945 } else {
1946 rcode = checkjobs(pi);
1947 }
1948 debug_printf("checkjobs returned %d\n",rcode);
1949 }
1950 last_return_code=rcode;
1951#else
c26e454d
WD		 1952 if (rcode < -1) {
1953 last_return_code = -rcode - 2;
1954 return -2; /* exit */
1955 }
fe8c2806
WD		 1956 last_return_code=(rcode == 0) ? 0 : 1;
1957#endif
1958#ifndef __U_BOOT__
1959 pi->num_progs = save_num_progs; /* restore number of programs */
1960#endif
1961 if ( rmode == RES_IF || rmode == RES_ELIF )
1962 next_if_code=rcode; /* can be overwritten a number of times */
1963 if (rmode == RES_WHILE)
1964 flag_rep = !last_return_code;
1965 if (rmode == RES_UNTIL)
1966 flag_rep = last_return_code;
1967 if ( (rcode==EXIT_SUCCESS && pi->followup==PIPE_OR) ||
1968 (rcode!=EXIT_SUCCESS && pi->followup==PIPE_AND) )
1969 skip_more_in_this_rmode=rmode;
1970#ifndef __U_BOOT__
1971 checkjobs(NULL);
1972#endif
1973 }
1974 return rcode;
1975}
1976
1977/* broken, of course, but OK for testing */
1978static char *indenter(int i)
1979{
1980 static char blanks[]=" ";
1981 return &blanks[sizeof(blanks)-i-1];
1982}
1983
1984/* return code is the exit status of the pipe */
1985static int free_pipe(struct pipe *pi, int indent)
1986{
1987 char **p;
1988 struct child_prog *child;
1989#ifndef __U_BOOT__
1990 struct redir_struct *r, *rnext;
1991#endif
1992 int a, i, ret_code=0;
1993 char *ind = indenter(indent);
1994
1995#ifndef __U_BOOT__
1996 if (pi->stopped_progs > 0)
1997 return ret_code;
1998 final_printf("%s run pipe: (pid %d)\n",ind,getpid());
1999#endif
2000 for (i=0; i<pi->num_progs; i++) {
2001 child = &pi->progs[i];
2002 final_printf("%s command %d:\n",ind,i);
2003 if (child->argv) {
2004 for (a=0,p=child->argv; *p; a++,p++) {
2005 final_printf("%s argv[%d] = %s\n",ind,a,*p);
2006 }
2007#ifndef __U_BOOT__
2008 globfree(&child->glob_result);
2009#else
8bde7f77
WD		 2010 for (a = child->argc;a >= 0;a--) {
2011 free(child->argv[a]);
2012 }
fe8c2806 2013 free(child->argv);
8bde7f77 2014 child->argc = 0;
fe8c2806
WD		 2015#endif
2016 child->argv=NULL;
2017 } else if (child->group) {
2018#ifndef __U_BOOT__
2019 final_printf("%s begin group (subshell:%d)\n",ind, child->subshell);
2020#endif
2021 ret_code = free_pipe_list(child->group,indent+3);
2022 final_printf("%s end group\n",ind);
2023 } else {
2024 final_printf("%s (nil)\n",ind);
2025 }
2026#ifndef __U_BOOT__
2027 for (r=child->redirects; r; r=rnext) {
2028 final_printf("%s redirect %d%s", ind, r->fd, redir_table[r->type].descrip);
2029 if (r->dup == -1) {
2030 /* guard against the case >$FOO, where foo is unset or blank */
2031 if (r->word.gl_pathv) {
2032 final_printf(" %s\n", *r->word.gl_pathv);
2033 globfree(&r->word);
2034 }
2035 } else {
2036 final_printf("&%d\n", r->dup);
2037 }
2038 rnext=r->next;
2039 free(r);
2040 }
2041 child->redirects=NULL;
2042#endif
2043 }
2044 free(pi->progs); /* children are an array, they get freed all at once */
2045 pi->progs=NULL;
2046 return ret_code;
2047}
2048
2049static int free_pipe_list(struct pipe *head, int indent)
2050{
2051 int rcode=0; /* if list has no members */
2052 struct pipe *pi, *next;
2053 char *ind = indenter(indent);
2054 for (pi=head; pi; pi=next) {
2055 final_printf("%s pipe reserved mode %d\n", ind, pi->r_mode);
2056 rcode = free_pipe(pi, indent);
2057 final_printf("%s pipe followup code %d\n", ind, pi->followup);
2058 next=pi->next;
2059 pi->next=NULL;
2060 free(pi);
2061 }
2062 return rcode;
2063}
2064
2065/* Select which version we will use */
2066static int run_list(struct pipe *pi)
2067{
2068 int rcode=0;
2069#ifndef __U_BOOT__
2070 if (fake_mode==0) {
2071#endif
2072 rcode = run_list_real(pi);
2073#ifndef __U_BOOT__
2074 }
2075#endif
2076 /* free_pipe_list has the side effect of clearing memory
2077 * In the long run that function can be merged with run_list_real,
2078 * but doing that now would hobble the debugging effort. */
2079 free_pipe_list(pi,0);
2080 return rcode;
2081}
2082
2083/* The API for glob is arguably broken. This routine pushes a non-matching
2084 * string into the output structure, removing non-backslashed backslashes.
2085 * If someone can prove me wrong, by performing this function within the
2086 * original glob(3) api, feel free to rewrite this routine into oblivion.
2087 * Return code (0 vs. GLOB_NOSPACE) matches glob(3).
2088 * XXX broken if the last character is '\\', check that before calling.
2089 */
2090#ifndef __U_BOOT__
2091static int globhack(const char *src, int flags, glob_t *pglob)
2092{
2093 int cnt=0, pathc;
2094 const char *s;
2095 char *dest;
2096 for (cnt=1, s=src; s && *s; s++) {
2097 if (*s == '\\') s++;
2098 cnt++;
2099 }
2100 dest = malloc(cnt);
2101 if (!dest) return GLOB_NOSPACE;
2102 if (!(flags & GLOB_APPEND)) {
2103 pglob->gl_pathv=NULL;
2104 pglob->gl_pathc=0;
2105 pglob->gl_offs=0;
2106 pglob->gl_offs=0;
2107 }
2108 pathc = ++pglob->gl_pathc;
2109 pglob->gl_pathv = realloc(pglob->gl_pathv, (pathc+1)*sizeof(*pglob->gl_pathv));
2110 if (pglob->gl_pathv == NULL) return GLOB_NOSPACE;
2111 pglob->gl_pathv[pathc-1]=dest;
2112 pglob->gl_pathv[pathc]=NULL;
2113 for (s=src; s && *s; s++, dest++) {
2114 if (*s == '\\') s++;
2115 *dest = *s;
2116 }
2117 *dest='\0';
2118 return 0;
2119}
2120
2121/* XXX broken if the last character is '\\', check that before calling */
2122static int glob_needed(const char *s)
2123{
2124 for (; *s; s++) {
2125 if (*s == '\\') s++;
2126 if (strchr("*[?",*s)) return 1;
2127 }
2128 return 0;
2129}
2130
2131#if 0
2132static void globprint(glob_t *pglob)
2133{
2134 int i;
2135 debug_printf("glob_t at %p:\n", pglob);
2136 debug_printf(" gl_pathc=%d gl_pathv=%p gl_offs=%d gl_flags=%d\n",
2137 pglob->gl_pathc, pglob->gl_pathv, pglob->gl_offs, pglob->gl_flags);
2138 for (i=0; i<pglob->gl_pathc; i++)
2139 debug_printf("pglob->gl_pathv[%d] = %p = %s\n", i,
2140 pglob->gl_pathv[i], pglob->gl_pathv[i]);
2141}
2142#endif
2143
2144static int xglob(o_string *dest, int flags, glob_t *pglob)
2145{
2146 int gr;
2147
8bde7f77 2148 /* short-circuit for null word */
fe8c2806 2149 /* we can code this better when the debug_printf's are gone */
8bde7f77
WD		 2150 if (dest->length == 0) {
2151 if (dest->nonnull) {
2152 /* bash man page calls this an "explicit" null */
2153 gr = globhack(dest->data, flags, pglob);
2154 debug_printf("globhack returned %d\n",gr);
2155 } else {
fe8c2806
WD		 2156 return 0;
2157 }
8bde7f77 2158 } else if (glob_needed(dest->data)) {
fe8c2806
WD		 2159 gr = glob(dest->data, flags, NULL, pglob);
2160 debug_printf("glob returned %d\n",gr);
2161 if (gr == GLOB_NOMATCH) {
2162 /* quote removal, or more accurately, backslash removal */
2163 gr = globhack(dest->data, flags, pglob);
2164 debug_printf("globhack returned %d\n",gr);
2165 }
2166 } else {
2167 gr = globhack(dest->data, flags, pglob);
2168 debug_printf("globhack returned %d\n",gr);
2169 }
2170 if (gr == GLOB_NOSPACE)
2171 error_msg_and_die("out of memory during glob");
2172 if (gr != 0) { /* GLOB_ABORTED ? */
2173 error_msg("glob(3) error %d",gr);
2174 }
2175 /* globprint(glob_target); */
2176 return gr;
2177}
2178#endif
2179
c26e454d
WD		 2180#ifdef __U_BOOT__
2181static char *get_dollar_var(char ch);
2182#endif
2183
fe8c2806
WD		 2184/* This is used to get/check local shell variables */
2185static char *get_local_var(const char *s)
2186{
2187 struct variables *cur;
2188
2189 if (!s)
2190 return NULL;
c26e454d
WD		 2191
2192#ifdef __U_BOOT__
2193 if (*s == '$')
2194 return get_dollar_var(s[1]);
2195#endif
2196
fe8c2806
WD		 2197 for (cur = top_vars; cur; cur=cur->next)
2198 if(strcmp(cur->name, s)==0)
2199 return cur->value;
2200 return NULL;
2201}
2202
2203/* This is used to set local shell variables
2204 flg_export==0 if only local (not exporting) variable
2205 flg_export==1 if "new" exporting environ
2206 flg_export>1 if current startup environ (not call putenv()) */
2207static int set_local_var(const char *s, int flg_export)
2208{
2209 char *name, *value;
2210 int result=0;
2211 struct variables *cur;
2212
c26e454d
WD		 2213#ifdef __U_BOOT__
2214 /* might be possible! */
2215 if (!isalpha(*s))
2216 return -1;
2217#endif
2218
fe8c2806
WD		 2219 name=strdup(s);
2220
2221#ifdef __U_BOOT__
2222 if (getenv(name) != NULL) {
2223 printf ("ERROR: "
2d1a537d 2224 "There is a global environment variable with the same name.\n");
c26e454d 2225 free(name);
fe8c2806
WD		 2226 return -1;
2227 }
2228#endif
2229 /* Assume when we enter this function that we are already in
2230 * NAME=VALUE format. So the first order of business is to
2231 * split 's' on the '=' into 'name' and 'value' */
2232 value = strchr(name, '=');
2233 if (value==0 && ++value==0) {
2234 free(name);
2235 return -1;
2236 }
2237 *value++ = 0;
2238
2239 for(cur = top_vars; cur; cur = cur->next) {
2240 if(strcmp(cur->name, name)==0)
2241 break;
2242 }
2243
2244 if(cur) {
2245 if(strcmp(cur->value, value)==0) {
2246 if(flg_export>0 && cur->flg_export==0)
2247 cur->flg_export=flg_export;
2248 else
2249 result++;
2250 } else {
2251 if(cur->flg_read_only) {
2252 error_msg("%s: readonly variable", name);
2253 result = -1;
2254 } else {
2255 if(flg_export>0 || cur->flg_export>1)
2256 cur->flg_export=1;
2257 free(cur->value);
2258
2259 cur->value = strdup(value);
2260 }
2261 }
2262 } else {
2263 cur = malloc(sizeof(struct variables));
2264 if(!cur) {
2265 result = -1;
2266 } else {
2267 cur->name = strdup(name);
2268 if(cur->name == 0) {
2269 free(cur);
2270 result = -1;
2271 } else {
2272 struct variables *bottom = top_vars;
2273 cur->value = strdup(value);
2274 cur->next = 0;
2275 cur->flg_export = flg_export;
2276 cur->flg_read_only = 0;
2277 while(bottom->next) bottom=bottom->next;
2278 bottom->next = cur;
2279 }
2280 }
2281 }
2282
2283#ifndef __U_BOOT__
2284 if(result==0 && cur->flg_export==1) {
2285 *(value-1) = '=';
2286 result = putenv(name);
2287 } else {
2288#endif
2289 free(name);
2290#ifndef __U_BOOT__
2291 if(result>0) /* equivalent to previous set */
2292 result = 0;
2293 }
2294#endif
2295 return result;
2296}
2297
2298#ifndef __U_BOOT__
2299static void unset_local_var(const char *name)
2300{
2301 struct variables *cur;
2302
2303 if (name) {
2304 for (cur = top_vars; cur; cur=cur->next) {
2305 if(strcmp(cur->name, name)==0)
2306 break;
2307 }
2308 if(cur!=0) {
2309 struct variables *next = top_vars;
2310 if(cur->flg_read_only) {
2311 error_msg("%s: readonly variable", name);
2312 return;
2313 } else {
2314 if(cur->flg_export)
2315 unsetenv(cur->name);
2316 free(cur->name);
2317 free(cur->value);
2318 while (next->next != cur)
2319 next = next->next;
2320 next->next = cur->next;
2321 }
2322 free(cur);
2323 }
2324 }
2325}
2326#endif
2327
2328static int is_assignment(const char *s)
2329{
c26e454d
WD		 2330 if (s == NULL)
2331 return 0;
2332
2333 if (!isalpha(*s)) return 0;
fe8c2806
WD		 2334 ++s;
2335 while(isalnum(*s) || *s=='_') ++s;
2336 return *s=='=';
2337}
2338
2339#ifndef __U_BOOT__
2340/* the src parameter allows us to peek forward to a possible &n syntax
2341 * for file descriptor duplication, e.g., "2>&1".
2342 * Return code is 0 normally, 1 if a syntax error is detected in src.
2343 * Resource errors (in xmalloc) cause the process to exit */
2344static int setup_redirect(struct p_context *ctx, int fd, redir_type style,
2345 struct in_str *input)
2346{
2347 struct child_prog *child=ctx->child;
2348 struct redir_struct *redir = child->redirects;
2349 struct redir_struct *last_redir=NULL;
2350
2351 /* Create a new redir_struct and drop it onto the end of the linked list */
2352 while(redir) {
2353 last_redir=redir;
2354 redir=redir->next;
2355 }
2356 redir = xmalloc(sizeof(struct redir_struct));
2357 redir->next=NULL;
2358 redir->word.gl_pathv=NULL;
2359 if (last_redir) {
2360 last_redir->next=redir;
2361 } else {
2362 child->redirects=redir;
2363 }
2364
2365 redir->type=style;
2366 redir->fd= (fd==-1) ? redir_table[style].default_fd : fd ;
2367
2368 debug_printf("Redirect type %d%s\n", redir->fd, redir_table[style].descrip);
2369
2370 /* Check for a '2>&1' type redirect */
2371 redir->dup = redirect_dup_num(input);
2372 if (redir->dup == -2) return 1; /* syntax error */
2373 if (redir->dup != -1) {
2374 /* Erik had a check here that the file descriptor in question
2375 * is legit; I postpone that to "run time"
2376 * A "-" representation of "close me" shows up as a -3 here */
2377 debug_printf("Duplicating redirect '%d>&%d'\n", redir->fd, redir->dup);
2378 } else {
2379 /* We do _not_ try to open the file that src points to,
2380 * since we need to return and let src be expanded first.
2381 * Set ctx->pending_redirect, so we know what to do at the
2382 * end of the next parsed word.
2383 */
2384 ctx->pending_redirect = redir;
2385 }
2386 return 0;
2387}
2388#endif
2389
2390struct pipe *new_pipe(void) {
2391 struct pipe *pi;
2392 pi = xmalloc(sizeof(struct pipe));
2393 pi->num_progs = 0;
2394 pi->progs = NULL;
2395 pi->next = NULL;
2396 pi->followup = 0; /* invalid */
e98f68be 2397 pi->r_mode = RES_NONE;
fe8c2806
WD		 2398 return pi;
2399}
2400
2401static void initialize_context(struct p_context *ctx)
2402{
2403 ctx->pipe=NULL;
2404#ifndef __U_BOOT__
2405 ctx->pending_redirect=NULL;
2406#endif
2407 ctx->child=NULL;
2408 ctx->list_head=new_pipe();
2409 ctx->pipe=ctx->list_head;
2410 ctx->w=RES_NONE;
2411 ctx->stack=NULL;
2412#ifdef __U_BOOT__
2413 ctx->old_flag=0;
2414#endif
2415 done_command(ctx); /* creates the memory for working child */
2416}
2417
2418/* normal return is 0
2419 * if a reserved word is found, and processed, return 1
2420 * should handle if, then, elif, else, fi, for, while, until, do, done.
2421 * case, function, and select are obnoxious, save those for later.
2422 */
3e38691e
WD		 2423struct reserved_combo {
2424 char *literal;
2425 int code;
2426 long flag;
2427};
2428/* Mostly a list of accepted follow-up reserved words.
2429 * FLAG_END means we are done with the sequence, and are ready
2430 * to turn the compound list into a command.
2431 * FLAG_START means the word must start a new compound list.
2432 */
2433static struct reserved_combo reserved_list[] = {
2434 { "if", RES_IF, FLAG_THEN | FLAG_START },
2435 { "then", RES_THEN, FLAG_ELIF | FLAG_ELSE | FLAG_FI },
2436 { "elif", RES_ELIF, FLAG_THEN },
2437 { "else", RES_ELSE, FLAG_FI },
2438 { "fi", RES_FI, FLAG_END },
2439 { "for", RES_FOR, FLAG_IN | FLAG_START },
2440 { "while", RES_WHILE, FLAG_DO | FLAG_START },
2441 { "until", RES_UNTIL, FLAG_DO | FLAG_START },
2442 { "in", RES_IN, FLAG_DO },
2443 { "do", RES_DO, FLAG_DONE },
2444 { "done", RES_DONE, FLAG_END }
2445};
2446#define NRES (sizeof(reserved_list)/sizeof(struct reserved_combo))
2447
fe8c2806
WD		 2448int reserved_word(o_string *dest, struct p_context *ctx)
2449{
fe8c2806
WD		 2450 struct reserved_combo *r;
2451 for (r=reserved_list;
fe8c2806
WD		 2452 r<reserved_list+NRES; r++) {
2453 if (strcmp(dest->data, r->literal) == 0) {
2454 debug_printf("found reserved word %s, code %d\n",r->literal,r->code);
2455 if (r->flag & FLAG_START) {
2456 struct p_context *new = xmalloc(sizeof(struct p_context));
2457 debug_printf("push stack\n");
2458 if (ctx->w == RES_IN || ctx->w == RES_FOR) {
2459 syntax();
2460 free(new);
2461 ctx->w = RES_SNTX;
2462 b_reset(dest);
2463 return 1;
2464 }
2465 *new = *ctx; /* physical copy */
2466 initialize_context(ctx);
2467 ctx->stack=new;
2468 } else if ( ctx->w == RES_NONE || ! (ctx->old_flag & (1<<r->code))) {
2469 syntax();
2470 ctx->w = RES_SNTX;
2471 b_reset(dest);
2472 return 1;
2473 }
2474 ctx->w=r->code;
2475 ctx->old_flag = r->flag;
2476 if (ctx->old_flag & FLAG_END) {
2477 struct p_context *old;
2478 debug_printf("pop stack\n");
2479 done_pipe(ctx,PIPE_SEQ);
2480 old = ctx->stack;
2481 old->child->group = ctx->list_head;
2482#ifndef __U_BOOT__
2483 old->child->subshell = 0;
2484#endif
2485 *ctx = *old; /* physical copy */
2486 free(old);
2487 }
2488 b_reset (dest);
2489 return 1;
2490 }
2491 }
2492 return 0;
2493}
2494
2495/* normal return is 0.
2496 * Syntax or xglob errors return 1. */
2497static int done_word(o_string *dest, struct p_context *ctx)
2498{
2499 struct child_prog *child=ctx->child;
2500#ifndef __U_BOOT__
2501 glob_t *glob_target;
2502 int gr, flags = 0;
2503#else
2504 char *str, *s;
2505 int argc, cnt;
2506#endif
2507
2508 debug_printf("done_word: %s %p\n", dest->data, child);
2509 if (dest->length == 0 && !dest->nonnull) {
2510 debug_printf(" true null, ignored\n");
2511 return 0;
2512 }
2513#ifndef __U_BOOT__
2514 if (ctx->pending_redirect) {
2515 glob_target = &ctx->pending_redirect->word;
2516 } else {
2517#endif
2518 if (child->group) {
2519 syntax();
2520 return 1; /* syntax error, groups and arglists don't mix */
2521 }
2522 if (!child->argv && (ctx->type & FLAG_PARSE_SEMICOLON)) {
2523 debug_printf("checking %s for reserved-ness\n",dest->data);
2524 if (reserved_word(dest,ctx)) return ctx->w==RES_SNTX;
2525 }
2526#ifndef __U_BOOT__
2527 glob_target = &child->glob_result;
8bde7f77 2528 if (child->argv) flags |= GLOB_APPEND;
fe8c2806
WD		 2529#else
2530 for (cnt = 1, s = dest->data; s && *s; s++) {
2531 if (*s == '\\') s++;
2532 cnt++;
2533 }
2534 str = malloc(cnt);
2535 if (!str) return 1;
2536 if ( child->argv == NULL) {
2537 child->argc=0;
2538 }
2539 argc = ++child->argc;
2540 child->argv = realloc(child->argv, (argc+1)*sizeof(*child->argv));
2541 if (child->argv == NULL) return 1;
2542 child->argv[argc-1]=str;
2543 child->argv[argc]=NULL;
2544 for (s = dest->data; s && *s; s++,str++) {
2545 if (*s == '\\') s++;
2546 *str = *s;
2547 }
2548 *str = '\0';
2549#endif
2550#ifndef __U_BOOT__
2551 }
2552 gr = xglob(dest, flags, glob_target);
2553 if (gr != 0) return 1;
2554#endif
2555
2556 b_reset(dest);
2557#ifndef __U_BOOT__
2558 if (ctx->pending_redirect) {
2559 ctx->pending_redirect=NULL;
2560 if (glob_target->gl_pathc != 1) {
2561 error_msg("ambiguous redirect");
2562 return 1;
2563 }
2564 } else {
2565 child->argv = glob_target->gl_pathv;
2566 }
2567#endif
2568 if (ctx->w == RES_FOR) {
2569 done_word(dest,ctx);
2570 done_pipe(ctx,PIPE_SEQ);
2571 }
2572 return 0;
2573}
2574
2575/* The only possible error here is out of memory, in which case
2576 * xmalloc exits. */
2577static int done_command(struct p_context *ctx)
2578{
2579 /* The child is really already in the pipe structure, so
2580 * advance the pipe counter and make a new, null child.
2581 * Only real trickiness here is that the uncommitted
2582 * child structure, to which ctx->child points, is not
2583 * counted in pi->num_progs. */
2584 struct pipe *pi=ctx->pipe;
2585 struct child_prog *prog=ctx->child;
2586
2587 if (prog && prog->group == NULL
8bde7f77 2588 && prog->argv == NULL
fe8c2806 2589#ifndef __U_BOOT__
8bde7f77 2590 && prog->redirects == NULL) {
fe8c2806
WD		 2591#else
2592 ) {
2593#endif
2594 debug_printf("done_command: skipping null command\n");
2595 return 0;
2596 } else if (prog) {
2597 pi->num_progs++;
2598 debug_printf("done_command: num_progs incremented to %d\n",pi->num_progs);
2599 } else {
2600 debug_printf("done_command: initializing\n");
2601 }
2602 pi->progs = xrealloc(pi->progs, sizeof(*pi->progs) * (pi->num_progs+1));
2603
2604 prog = pi->progs + pi->num_progs;
2605#ifndef __U_BOOT__
2606 prog->redirects = NULL;
2607#endif
2608 prog->argv = NULL;
2609#ifndef __U_BOOT__
2610 prog->is_stopped = 0;
2611#endif
2612 prog->group = NULL;
2613#ifndef __U_BOOT__
2614 prog->glob_result.gl_pathv = NULL;
2615 prog->family = pi;
2616#endif
2617 prog->sp = 0;
2618 ctx->child = prog;
2619 prog->type = ctx->type;
2620
2621 /* but ctx->pipe and ctx->list_head remain unchanged */
2622 return 0;
2623}
2624
2625static int done_pipe(struct p_context *ctx, pipe_style type)
2626{
2627 struct pipe *new_p;
2628 done_command(ctx); /* implicit closure of previous command */
2629 debug_printf("done_pipe, type %d\n", type);
2630 ctx->pipe->followup = type;
2631 ctx->pipe->r_mode = ctx->w;
2632 new_p=new_pipe();
2633 ctx->pipe->next = new_p;
2634 ctx->pipe = new_p;
2635 ctx->child = NULL;
2636 done_command(ctx); /* set up new pipe to accept commands */
2637 return 0;
2638}
2639
2640#ifndef __U_BOOT__
2641/* peek ahead in the in_str to find out if we have a "&n" construct,
2642 * as in "2>&1", that represents duplicating a file descriptor.
2643 * returns either -2 (syntax error), -1 (no &), or the number found.
2644 */
2645static int redirect_dup_num(struct in_str *input)
2646{
2647 int ch, d=0, ok=0;
2648 ch = b_peek(input);
2649 if (ch != '&') return -1;
2650
2651 b_getch(input); /* get the & */
2652 ch=b_peek(input);
2653 if (ch == '-') {
2654 b_getch(input);
2655 return -3; /* "-" represents "close me" */
2656 }
2657 while (isdigit(ch)) {
2658 d = d*10+(ch-'0');
2659 ok=1;
2660 b_getch(input);
2661 ch = b_peek(input);
2662 }
2663 if (ok) return d;
2664
2665 error_msg("ambiguous redirect");
2666 return -2;
2667}
2668
2669/* If a redirect is immediately preceded by a number, that number is
2670 * supposed to tell which file descriptor to redirect. This routine
2671 * looks for such preceding numbers. In an ideal world this routine
2672 * needs to handle all the following classes of redirects...
2673 * echo 2>foo # redirects fd 2 to file "foo", nothing passed to echo
2674 * echo 49>foo # redirects fd 49 to file "foo", nothing passed to echo
2675 * echo -2>foo # redirects fd 1 to file "foo", "-2" passed to echo
2676 * echo 49x>foo # redirects fd 1 to file "foo", "49x" passed to echo
2677 * A -1 output from this program means no valid number was found, so the
2678 * caller should use the appropriate default for this redirection.
2679 */
2680static int redirect_opt_num(o_string *o)
2681{
2682 int num;
2683
2684 if (o->length==0) return -1;
2685 for(num=0; num<o->length; num++) {
2686 if (!isdigit(*(o->data+num))) {
2687 return -1;
2688 }
2689 }
2690 /* reuse num (and save an int) */
2691 num=atoi(o->data);
2692 b_reset(o);
2693 return num;
2694}
2695
2696FILE *generate_stream_from_list(struct pipe *head)
2697{
2698 FILE *pf;
2699#if 1
2700 int pid, channel[2];
2701 if (pipe(channel)<0) perror_msg_and_die("pipe");
2702 pid=fork();
2703 if (pid<0) {
2704 perror_msg_and_die("fork");
2705 } else if (pid==0) {
2706 close(channel[0]);
2707 if (channel[1] != 1) {
2708 dup2(channel[1],1);
2709 close(channel[1]);
2710 }
2711#if 0
2712#define SURROGATE "surrogate response"
2713 write(1,SURROGATE,sizeof(SURROGATE));
2714 _exit(run_list(head));
2715#else
2716 _exit(run_list_real(head)); /* leaks memory */
2717#endif
2718 }
2719 debug_printf("forked child %d\n",pid);
2720 close(channel[1]);
2721 pf = fdopen(channel[0],"r");
2722 debug_printf("pipe on FILE *%p\n",pf);
2723#else
2724 free_pipe_list(head,0);
2725 pf=popen("echo surrogate response","r");
2726 debug_printf("started fake pipe on FILE *%p\n",pf);
2727#endif
2728 return pf;
2729}
2730
2731/* this version hacked for testing purposes */
2732/* return code is exit status of the process that is run. */
2733static int process_command_subs(o_string *dest, struct p_context *ctx, struct in_str *input, int subst_end)
2734{
2735 int retcode;
2736 o_string result=NULL_O_STRING;
2737 struct p_context inner;
2738 FILE *p;
2739 struct in_str pipe_str;
2740 initialize_context(&inner);
2741
2742 /* recursion to generate command */
2743 retcode = parse_stream(&result, &inner, input, subst_end);
2744 if (retcode != 0) return retcode; /* syntax error or EOF */
2745 done_word(&result, &inner);
2746 done_pipe(&inner, PIPE_SEQ);
2747 b_free(&result);
2748
2749 p=generate_stream_from_list(inner.list_head);
2750 if (p==NULL) return 1;
2751 mark_open(fileno(p));
2752 setup_file_in_str(&pipe_str, p);
2753
2754 /* now send results of command back into original context */
2755 retcode = parse_stream(dest, ctx, &pipe_str, '\0');
2756 /* XXX In case of a syntax error, should we try to kill the child?
2757 * That would be tough to do right, so just read until EOF. */
2758 if (retcode == 1) {
2759 while (b_getch(&pipe_str)!=EOF) { /* discard */ };
2760 }
2761
2762 debug_printf("done reading from pipe, pclose()ing\n");
2763 /* This is the step that wait()s for the child. Should be pretty
2764 * safe, since we just read an EOF from its stdout. We could try
2765 * to better, by using wait(), and keeping track of background jobs
2766 * at the same time. That would be a lot of work, and contrary
2767 * to the KISS philosophy of this program. */
2768 mark_closed(fileno(p));
2769 retcode=pclose(p);
2770 free_pipe_list(inner.list_head,0);
2771 debug_printf("pclosed, retcode=%d\n",retcode);
2772 /* XXX this process fails to trim a single trailing newline */
2773 return retcode;
2774}
2775
2776static int parse_group(o_string *dest, struct p_context *ctx,
2777 struct in_str *input, int ch)
2778{
2779 int rcode, endch=0;
2780 struct p_context sub;
2781 struct child_prog *child = ctx->child;
2782 if (child->argv) {
2783 syntax();
2784 return 1; /* syntax error, groups and arglists don't mix */
2785 }
2786 initialize_context(&sub);
2787 switch(ch) {
2788 case '(': endch=')'; child->subshell=1; break;
2789 case '{': endch='}'; break;
2790 default: syntax(); /* really logic error */
2791 }
2792 rcode=parse_stream(dest,&sub,input,endch);
2793 done_word(dest,&sub); /* finish off the final word in the subcontext */
2794 done_pipe(&sub, PIPE_SEQ); /* and the final command there, too */
2795 child->group = sub.list_head;
2796 return rcode;
2797 /* child remains "open", available for possible redirects */
2798}
2799#endif
2800
2801/* basically useful version until someone wants to get fancier,
2802 * see the bash man page under "Parameter Expansion" */
2803static char *lookup_param(char *src)
2804{
c26e454d
WD		 2805 char *p;
2806
2807 if (!src)
2808 return NULL;
2809
fe8c2806
WD		 2810 p = getenv(src);
2811 if (!p)
2812 p = get_local_var(src);
c26e454d 2813
fe8c2806
WD		 2814 return p;
2815}
2816
c26e454d
WD		 2817#ifdef __U_BOOT__
2818static char *get_dollar_var(char ch)
2819{
2820 static char buf[40];
2821
2822 buf[0] = '\0';
2823 switch (ch) {
2824 case '?':
2825 sprintf(buf, "%u", (unsigned int)last_return_code);
2826 break;
2827 default:
2828 return NULL;
2829 }
2830 return buf;
2831}
2832#endif
2833
fe8c2806
WD		 2834/* return code: 0 for OK, 1 for syntax error */
2835static int handle_dollar(o_string *dest, struct p_context *ctx, struct in_str *input)
2836{
2837#ifndef __U_BOOT__
2838 int i, advance=0;
2839#else
2840 int advance=0;
2841#endif
2842#ifndef __U_BOOT__
2843 char sep[]=" ";
2844#endif
2845 int ch = input->peek(input); /* first character after the $ */
2846 debug_printf("handle_dollar: ch=%c\n",ch);
2847 if (isalpha(ch)) {
2848 b_addchr(dest, SPECIAL_VAR_SYMBOL);
2849 ctx->child->sp++;
2850 while(ch=b_peek(input),isalnum(ch) || ch=='_') {
2851 b_getch(input);
2852 b_addchr(dest,ch);
2853 }
2854 b_addchr(dest, SPECIAL_VAR_SYMBOL);
2855#ifndef __U_BOOT__
2856 } else if (isdigit(ch)) {
2857 i = ch-'0'; /* XXX is $0 special? */
2858 if (i<global_argc) {
2859 parse_string(dest, ctx, global_argv[i]); /* recursion */
2860 }
2861 advance = 1;
2862#endif
2863 } else switch (ch) {
2864#ifndef __U_BOOT__
2865 case '$':
2866 b_adduint(dest,getpid());
2867 advance = 1;
2868 break;
2869 case '!':
2870 if (last_bg_pid > 0) b_adduint(dest, last_bg_pid);
2871 advance = 1;
2872 break;
2873#endif
2874 case '?':
c26e454d 2875#ifndef __U_BOOT__
fe8c2806 2876 b_adduint(dest,last_return_code);
c26e454d
WD		 2877#else
2878 ctx->child->sp++;
2879 b_addchr(dest, SPECIAL_VAR_SYMBOL);
2880 b_addchr(dest, '$');
2881 b_addchr(dest, '?');
2882 b_addchr(dest, SPECIAL_VAR_SYMBOL);
2883#endif
fe8c2806
WD		 2884 advance = 1;
2885 break;
2886#ifndef __U_BOOT__
2887 case '#':
2888 b_adduint(dest,global_argc ? global_argc-1 : 0);
2889 advance = 1;
2890 break;
2891#endif
2892 case '{':
2893 b_addchr(dest, SPECIAL_VAR_SYMBOL);
2894 ctx->child->sp++;
2895 b_getch(input);
2896 /* XXX maybe someone will try to escape the '}' */
2897 while(ch=b_getch(input),ch!=EOF && ch!='}') {
2898 b_addchr(dest,ch);
2899 }
2900 if (ch != '}') {
2901 syntax();
2902 return 1;
2903 }
2904 b_addchr(dest, SPECIAL_VAR_SYMBOL);
2905 break;
2906#ifndef __U_BOOT__
2907 case '(':
2908 b_getch(input);
2909 process_command_subs(dest, ctx, input, ')');
2910 break;
2911 case '*':
2912 sep[0]=ifs[0];
2913 for (i=1; i<global_argc; i++) {
2914 parse_string(dest, ctx, global_argv[i]);
2915 if (i+1 < global_argc) parse_string(dest, ctx, sep);
2916 }
2917 break;
2918 case '@':
2919 case '-':
2920 case '_':
2921 /* still unhandled, but should be eventually */
2922 error_msg("unhandled syntax: $%c",ch);
2923 return 1;
2924 break;
2925#endif
2926 default:
2927 b_addqchr(dest,'$',dest->quote);
2928 }
2929 /* Eat the character if the flag was set. If the compiler
2930 * is smart enough, we could substitute "b_getch(input);"
2931 * for all the "advance = 1;" above, and also end up with
2932 * a nice size-optimized program. Hah! That'll be the day.
2933 */
2934 if (advance) b_getch(input);
2935 return 0;
2936}
2937
2938#ifndef __U_BOOT__
2939int parse_string(o_string *dest, struct p_context *ctx, const char *src)
2940{
2941 struct in_str foo;
2942 setup_string_in_str(&foo, src);
2943 return parse_stream(dest, ctx, &foo, '\0');
2944}
2945#endif
2946
2947/* return code is 0 for normal exit, 1 for syntax error */
2948int parse_stream(o_string *dest, struct p_context *ctx,
2949 struct in_str *input, int end_trigger)
2950{
2951 unsigned int ch, m;
2952#ifndef __U_BOOT__
2953 int redir_fd;
2954 redir_type redir_style;
2955#endif
2956 int next;
2957
2958 /* Only double-quote state is handled in the state variable dest->quote.
2959 * A single-quote triggers a bypass of the main loop until its mate is
2960 * found. When recursing, quote state is passed in via dest->quote. */
2961
2962 debug_printf("parse_stream, end_trigger=%d\n",end_trigger);
2963 while ((ch=b_getch(input))!=EOF) {
2964 m = map[ch];
2965#ifdef __U_BOOT__
2966 if (input->__promptme == 0) return 1;
2967#endif
2968 next = (ch == '\n') ? 0 : b_peek(input);
c26e454d
WD		 2969
2970 debug_printf("parse_stream: ch=%c (%d) m=%d quote=%d - %c\n",
2971 ch >= ' ' ? ch : '.', ch, m,
2972 dest->quote, ctx->stack == NULL ? '*' : '.');
2973
fe8c2806
WD		 2974 if (m==0 || ((m==1 || m==2) && dest->quote)) {
2975 b_addqchr(dest, ch, dest->quote);
2976 } else {
2977 if (m==2) { /* unquoted IFS */
2978 if (done_word(dest, ctx)) {
2979 return 1;
2980 }
2981 /* If we aren't performing a substitution, treat a newline as a
2982 * command separator. */
2983 if (end_trigger != '\0' && ch=='\n')
2984 done_pipe(ctx,PIPE_SEQ);
2985 }
2986 if (ch == end_trigger && !dest->quote && ctx->w==RES_NONE) {
2987 debug_printf("leaving parse_stream (triggered)\n");
2988 return 0;
2989 }
2990#if 0
2991 if (ch=='\n') {
2992 /* Yahoo! Time to run with it! */
2993 done_pipe(ctx,PIPE_SEQ);
2994 run_list(ctx->list_head);
2995 initialize_context(ctx);
2996 }
2997#endif
2998 if (m!=2) switch (ch) {
2999 case '#':
3000 if (dest->length == 0 && !dest->quote) {
3001 while(ch=b_peek(input),ch!=EOF && ch!='\n') { b_getch(input); }
3002 } else {
3003 b_addqchr(dest, ch, dest->quote);
3004 }
3005 break;
3006 case '\\':
3007 if (next == EOF) {
3008 syntax();
3009 return 1;
3010 }
3011 b_addqchr(dest, '\\', dest->quote);
3012 b_addqchr(dest, b_getch(input), dest->quote);
3013 break;
3014 case '$':
3015 if (handle_dollar(dest, ctx, input)!=0) return 1;
3016 break;
3017 case '\'':
3018 dest->nonnull = 1;
3019 while(ch=b_getch(input),ch!=EOF && ch!='\'') {
3020#ifdef __U_BOOT__
3021 if(input->__promptme == 0) return 1;
3022#endif
3023 b_addchr(dest,ch);
3024 }
3025 if (ch==EOF) {
3026 syntax();
3027 return 1;
3028 }
3029 break;
3030 case '"':
3031 dest->nonnull = 1;
3032 dest->quote = !dest->quote;
3033 break;
3034#ifndef __U_BOOT__
3035 case '`':
3036 process_command_subs(dest, ctx, input, '`');
3037 break;
3038 case '>':
3039 redir_fd = redirect_opt_num(dest);
3040 done_word(dest, ctx);
3041 redir_style=REDIRECT_OVERWRITE;
3042 if (next == '>') {
3043 redir_style=REDIRECT_APPEND;
3044 b_getch(input);
3045 } else if (next == '(') {
3046 syntax(); /* until we support >(list) Process Substitution */
3047 return 1;
3048 }
3049 setup_redirect(ctx, redir_fd, redir_style, input);
3050 break;
3051 case '<':
3052 redir_fd = redirect_opt_num(dest);
3053 done_word(dest, ctx);
3054 redir_style=REDIRECT_INPUT;
3055 if (next == '<') {
3056 redir_style=REDIRECT_HEREIS;
3057 b_getch(input);
3058 } else if (next == '>') {
3059 redir_style=REDIRECT_IO;
3060 b_getch(input);
3061 } else if (next == '(') {
3062 syntax(); /* until we support <(list) Process Substitution */
3063 return 1;
3064 }
3065 setup_redirect(ctx, redir_fd, redir_style, input);
3066 break;
3067#endif
3068 case ';':
3069 done_word(dest, ctx);
3070 done_pipe(ctx,PIPE_SEQ);
3071 break;
3072 case '&':
3073 done_word(dest, ctx);
3074 if (next=='&') {
3075 b_getch(input);
3076 done_pipe(ctx,PIPE_AND);
3077 } else {
3078#ifndef __U_BOOT__
3079 done_pipe(ctx,PIPE_BG);
3080#else
3081 syntax_err();
3082 return 1;
3083#endif
3084 }
3085 break;
3086 case '|':
3087 done_word(dest, ctx);
3088 if (next=='|') {
3089 b_getch(input);
3090 done_pipe(ctx,PIPE_OR);
3091 } else {
3092 /* we could pick up a file descriptor choice here
3093 * with redirect_opt_num(), but bash doesn't do it.
3094 * "echo foo 2| cat" yields "foo 2". */
3095#ifndef __U_BOOT__
3096 done_command(ctx);
3097#else
3098 syntax_err();
3099 return 1;
3100#endif
3101 }
3102 break;
3103#ifndef __U_BOOT__
3104 case '(':
3105 case '{':
3106 if (parse_group(dest, ctx, input, ch)!=0) return 1;
3107 break;
3108 case ')':
3109 case '}':
3110 syntax(); /* Proper use of this character caught by end_trigger */
3111 return 1;
3112 break;
3113#endif
3114 default:
3115 syntax(); /* this is really an internal logic error */
3116 return 1;
3117 }
3118 }
3119 }
3120 /* complain if quote? No, maybe we just finished a command substitution
3121 * that was quoted. Example:
3122 * $ echo "`cat foo` plus more"
3123 * and we just got the EOF generated by the subshell that ran "cat foo"
3124 * The only real complaint is if we got an EOF when end_trigger != '\0',
3125 * that is, we were really supposed to get end_trigger, and never got
3126 * one before the EOF. Can't use the standard "syntax error" return code,
3127 * so that parse_stream_outer can distinguish the EOF and exit smoothly. */
3128 debug_printf("leaving parse_stream (EOF)\n");
3129 if (end_trigger != '\0') return -1;
3130 return 0;
3131}
3132
3133void mapset(const unsigned char *set, int code)
3134{
3135 const unsigned char *s;
3136 for (s=set; *s; s++) map[*s] = code;
3137}
3138
3139void update_ifs_map(void)
3140{
3141 /* char *ifs and char map[256] are both globals. */
77ddac94
WD		 3142 ifs = (uchar *)getenv("IFS");
3143 if (ifs == NULL) ifs=(uchar *)" \t\n";
fe8c2806
WD		 3144 /* Precompute a list of 'flow through' behavior so it can be treated
3145 * quickly up front. Computation is necessary because of IFS.
3146 * Special case handling of IFS == " \t\n" is not implemented.
3147 * The map[] array only really needs two bits each, and on most machines
3148 * that would be faster because of the reduced L1 cache footprint.
3149 */
3150 memset(map,0,sizeof(map)); /* most characters flow through always */
3151#ifndef __U_BOOT__
77ddac94
WD		 3152 mapset((uchar *)"\\$'\"`", 3); /* never flow through */
3153 mapset((uchar *)"<>;&|(){}#", 1); /* flow through if quoted */
fe8c2806 3154#else
77ddac94
WD		 3155 mapset((uchar *)"\\$'\"", 3); /* never flow through */
3156 mapset((uchar *)";&|#", 1); /* flow through if quoted */
fe8c2806
WD		 3157#endif
3158 mapset(ifs, 2); /* also flow through if quoted */
3159}
3160
3161/* most recursion does not come through here, the exeception is
3162 * from builtin_source() */
3163int parse_stream_outer(struct in_str *inp, int flag)
3164{
3165
3166 struct p_context ctx;
3167 o_string temp=NULL_O_STRING;
3168 int rcode;
3169#ifdef __U_BOOT__
3170 int code = 0;
3171#endif
3172 do {
3173 ctx.type = flag;
3174 initialize_context(&ctx);
3175 update_ifs_map();
77ddac94 3176 if (!(flag & FLAG_PARSE_SEMICOLON) || (flag & FLAG_REPARSING)) mapset((uchar *)";$&|", 0);
fe8c2806
WD		 3177 inp->promptmode=1;
3178 rcode = parse_stream(&temp, &ctx, inp, '\n');
3179#ifdef __U_BOOT__
3180 if (rcode == 1) flag_repeat = 0;
3181#endif
3182 if (rcode != 1 && ctx.old_flag != 0) {
3183 syntax();
3184#ifdef __U_BOOT__
3185 flag_repeat = 0;
3186#endif
3187 }
3188 if (rcode != 1 && ctx.old_flag == 0) {
3189 done_word(&temp, &ctx);
3190 done_pipe(&ctx,PIPE_SEQ);
3191#ifndef __U_BOOT__
3192 run_list(ctx.list_head);
3193#else
c26e454d
WD		 3194 code = run_list(ctx.list_head);
3195 if (code == -2) { /* exit */
3196 b_free(&temp);
3197 code = 0;
3198 /* XXX hackish way to not allow exit from main loop */
3199 if (inp->peek == file_peek) {
3200 printf("exit not allowed from main input shell.\n");
3201 continue;
3202 }
3203 break;
3204 }
3205 if (code == -1)
fe8c2806
WD		 3206 flag_repeat = 0;
3207#endif
3208 } else {
3209 if (ctx.old_flag != 0) {
3210 free(ctx.stack);
3211 b_reset(&temp);
3212 }
3213#ifdef __U_BOOT__
3214 if (inp->__promptme == 0) printf("<INTERRUPT>\n");
3215 inp->__promptme = 1;
3216#endif
3217 temp.nonnull = 0;
3218 temp.quote = 0;
3219 inp->p = NULL;
3220 free_pipe_list(ctx.list_head,0);
3221 }
3222 b_free(&temp);
3223 } while (rcode != -1 && !(flag & FLAG_EXIT_FROM_LOOP)); /* loop on syntax errors, return on EOF */
3224#ifndef __U_BOOT__
3225 return 0;
3226#else
3227 return (code != 0) ? 1 : 0;
3228#endif /* __U_BOOT__ */
3229}
3230
3231#ifndef __U_BOOT__
3232static int parse_string_outer(const char *s, int flag)
3233#else
3234int parse_string_outer(char *s, int flag)
3235#endif /* __U_BOOT__ */
3236{
3237 struct in_str input;
3238#ifdef __U_BOOT__
3239 char *p = NULL;
3240 int rcode;
3241 if ( !s || !*s)
3242 return 1;
3243 if (!(p = strchr(s, '\n')) || *++p) {
3244 p = xmalloc(strlen(s) + 2);
3245 strcpy(p, s);
3246 strcat(p, "\n");
3247 setup_string_in_str(&input, p);
3248 rcode = parse_stream_outer(&input, flag);
3249 free(p);
3250 return rcode;
3251 } else {
3252#endif
3253 setup_string_in_str(&input, s);
3254 return parse_stream_outer(&input, flag);
3255#ifdef __U_BOOT__
3256 }
3257#endif
3258}
3259
3260#ifndef __U_BOOT__
3261static int parse_file_outer(FILE *f)
3262#else
3263int parse_file_outer(void)
3264#endif
3265{
3266 int rcode;
3267 struct in_str input;
3268#ifndef __U_BOOT__
3269 setup_file_in_str(&input, f);
3270#else
3271 setup_file_in_str(&input);
3272#endif
3273 rcode = parse_stream_outer(&input, FLAG_PARSE_SEMICOLON);
3274 return rcode;
3275}
3276
3277#ifdef __U_BOOT__
3e38691e
WD		 3278static void u_boot_hush_reloc(void)
3279{
3e38691e
WD		 3280 unsigned long addr;
3281 struct reserved_combo *r;
3282
3283 for (r=reserved_list; r<reserved_list+NRES; r++) {
3284 addr = (ulong) (r->literal) + gd->reloc_off;
3285 r->literal = (char *)addr;
3286 }
3287}
3288
fe8c2806
WD		 3289int u_boot_hush_start(void)
3290{
2d5b561e
WD		 3291 if (top_vars == NULL) {
3292 top_vars = malloc(sizeof(struct variables));
3293 top_vars->name = "HUSH_VERSION";
3294 top_vars->value = "0.01";
3295 top_vars->next = 0;
3296 top_vars->flg_export = 0;
3297 top_vars->flg_read_only = 1;
3298 u_boot_hush_reloc();
3299 }
fe8c2806
WD		 3300 return 0;
3301}
3302
3303static void *xmalloc(size_t size)
3304{
3305 void *p = NULL;
3306
3307 if (!(p = malloc(size))) {
3308 printf("ERROR : memory not allocated\n");
3309 for(;;);
3310 }
3311 return p;
3312}
3313
3314static void *xrealloc(void *ptr, size_t size)
3315{
3316 void *p = NULL;
3317
3318 if (!(p = realloc(ptr, size))) {
3319 printf("ERROR : memory not allocated\n");
3320 for(;;);
3321 }
3322 return p;
3323}
3324#endif /* __U_BOOT__ */
3325
3326#ifndef __U_BOOT__
3327/* Make sure we have a controlling tty. If we get started under a job
3328 * aware app (like bash for example), make sure we are now in charge so
3329 * we don't fight over who gets the foreground */
d0fb80c3 3330static void setup_job_control(void)
fe8c2806
WD		 3331{
3332 static pid_t shell_pgrp;
3333 /* Loop until we are in the foreground. */
3334 while (tcgetpgrp (shell_terminal) != (shell_pgrp = getpgrp ()))
3335 kill (- shell_pgrp, SIGTTIN);
3336
3337 /* Ignore interactive and job-control signals. */
3338 signal(SIGINT, SIG_IGN);
3339 signal(SIGQUIT, SIG_IGN);
3340 signal(SIGTERM, SIG_IGN);
3341 signal(SIGTSTP, SIG_IGN);
3342 signal(SIGTTIN, SIG_IGN);
3343 signal(SIGTTOU, SIG_IGN);
3344 signal(SIGCHLD, SIG_IGN);
3345
3346 /* Put ourselves in our own process group. */
3347 setsid();
3348 shell_pgrp = getpid ();
3349 setpgid (shell_pgrp, shell_pgrp);
3350
3351 /* Grab control of the terminal. */
3352 tcsetpgrp(shell_terminal, shell_pgrp);
3353}
3354
3355int hush_main(int argc, char **argv)
3356{
3357 int opt;
3358 FILE *input;
3359 char **e = environ;
3360
3361 /* XXX what should these be while sourcing /etc/profile? */
3362 global_argc = argc;
3363 global_argv = argv;
3364
3365 /* (re?) initialize globals. Sometimes hush_main() ends up calling
3366 * hush_main(), therefore we cannot rely on the BSS to zero out this
3367 * stuff. Reset these to 0 every time. */
3368 ifs = NULL;
3369 /* map[] is taken care of with call to update_ifs_map() */
3370 fake_mode = 0;
3371 interactive = 0;
3372 close_me_head = NULL;
3373 last_bg_pid = 0;
3374 job_list = NULL;
3375 last_jobid = 0;
3376
3377 /* Initialize some more globals to non-zero values */
3378 set_cwd();
d0fb80c3 3379#ifdef CONFIG_FEATURE_COMMAND_EDITING
fe8c2806
WD		 3380 cmdedit_set_initial_prompt();
3381#else
3382 PS1 = NULL;
3383#endif
3384 PS2 = "> ";
3385
3386 /* initialize our shell local variables with the values
3387 * currently living in the environment */
3388 if (e) {
3389 for (; *e; e++)
3390 set_local_var(*e, 2); /* without call putenv() */
3391 }
3392
3393 last_return_code=EXIT_SUCCESS;
3394
3395
3396 if (argv[0] && argv[0][0] == '-') {
3397 debug_printf("\nsourcing /etc/profile\n");
3398 if ((input = fopen("/etc/profile", "r")) != NULL) {
3399 mark_open(fileno(input));
3400 parse_file_outer(input);
3401 mark_closed(fileno(input));
3402 fclose(input);
3403 }
3404 }
3405 input=stdin;
3406
3407 while ((opt = getopt(argc, argv, "c:xif")) > 0) {
3408 switch (opt) {
3409 case 'c':
3410 {
3411 global_argv = argv+optind;
3412 global_argc = argc-optind;
3413 opt = parse_string_outer(optarg, FLAG_PARSE_SEMICOLON);
3414 goto final_return;
3415 }
3416 break;
3417 case 'i':
3418 interactive++;
3419 break;
3420 case 'f':
3421 fake_mode++;
3422 break;
3423 default:
3424#ifndef BB_VER
3425 fprintf(stderr, "Usage: sh [FILE]...\n"
3426 " or: sh -c command [args]...\n\n");
3427 exit(EXIT_FAILURE);
3428#else
3429 show_usage();
3430#endif
3431 }
3432 }
3433 /* A shell is interactive if the `-i' flag was given, or if all of
3434 * the following conditions are met:
3435 * no -c command
3436 * no arguments remaining or the -s flag given
3437 * standard input is a terminal
3438 * standard output is a terminal
3439 * Refer to Posix.2, the description of the `sh' utility. */
3440 if (argv[optind]==NULL && input==stdin &&
3441 isatty(fileno(stdin)) && isatty(fileno(stdout))) {
3442 interactive++;
3443 }
3444
3445 debug_printf("\ninteractive=%d\n", interactive);
3446 if (interactive) {
3447 /* Looks like they want an interactive shell */
8bde7f77 3448#ifndef CONFIG_FEATURE_SH_EXTRA_QUIET
d0fb80c3
WD		 3449 printf( "\n\n" BB_BANNER " hush - the humble shell v0.01 (testing)\n");
3450 printf( "Enter 'help' for a list of built-in commands.\n\n");
3451#endif
fe8c2806
WD		 3452 setup_job_control();
3453 }
3454
3455 if (argv[optind]==NULL) {
3456 opt=parse_file_outer(stdin);
3457 goto final_return;
3458 }
3459
3460 debug_printf("\nrunning script '%s'\n", argv[optind]);
3461 global_argv = argv+optind;
3462 global_argc = argc-optind;
3463 input = xfopen(argv[optind], "r");
3464 opt = parse_file_outer(input);
3465
d0fb80c3 3466#ifdef CONFIG_FEATURE_CLEAN_UP
fe8c2806
WD		 3467 fclose(input);
3468 if (cwd && cwd != unknown)
3469 free((char*)cwd);
3470 {
3471 struct variables *cur, *tmp;
3472 for(cur = top_vars; cur; cur = tmp) {
3473 tmp = cur->next;
3474 if (!cur->flg_read_only) {
3475 free(cur->name);
3476 free(cur->value);
3477 free(cur);
3478 }
3479 }
3480 }
3481#endif
3482
3483final_return:
3484 return(opt?opt:last_return_code);
3485}
3486#endif
3487
3488static char *insert_var_value(char *inp)
3489{
3490 int res_str_len = 0;
3491 int len;
3492 int done = 0;
3493 char *p, *p1, *res_str = NULL;
3494
3495 while ((p = strchr(inp, SPECIAL_VAR_SYMBOL))) {
3496 if (p != inp) {
3497 len = p - inp;
3498 res_str = xrealloc(res_str, (res_str_len + len));
3499 strncpy((res_str + res_str_len), inp, len);
3500 res_str_len += len;
3501 }
3502 inp = ++p;
3503 p = strchr(inp, SPECIAL_VAR_SYMBOL);
3504 *p = '\0';
3505 if ((p1 = lookup_param(inp))) {
3506 len = res_str_len + strlen(p1);
3507 res_str = xrealloc(res_str, (1 + len));
3508 strcpy((res_str + res_str_len), p1);
3509 res_str_len = len;
3510 }
3511 *p = SPECIAL_VAR_SYMBOL;
3512 inp = ++p;
3513 done = 1;
3514 }
3515 if (done) {
3516 res_str = xrealloc(res_str, (1 + res_str_len + strlen(inp)));
3517 strcpy((res_str + res_str_len), inp);
3518 while ((p = strchr(res_str, '\n'))) {
3519 *p = ' ';
3520 }
3521 }
3522 return (res_str == NULL) ? inp : res_str;
3523}
3524
3525static char **make_list_in(char **inp, char *name)
3526{
3527 int len, i;
3528 int name_len = strlen(name);
3529 int n = 0;
3530 char **list;
3531 char *p1, *p2, *p3;
3532
3533 /* create list of variable values */
3534 list = xmalloc(sizeof(*list));
3535 for (i = 0; inp[i]; i++) {
3536 p3 = insert_var_value(inp[i]);
3537 p1 = p3;
3538 while (*p1) {
3539 if ((*p1 == ' ')) {
3540 p1++;
3541 continue;
3542 }
3543 if ((p2 = strchr(p1, ' '))) {
3544 len = p2 - p1;
3545 } else {
3546 len = strlen(p1);
3547 p2 = p1 + len;
3548 }
3549 /* we use n + 2 in realloc for list,because we add
3550 * new element and then we will add NULL element */
3551 list = xrealloc(list, sizeof(*list) * (n + 2));
3552 list[n] = xmalloc(2 + name_len + len);
3553 strcpy(list[n], name);
3554 strcat(list[n], "=");
3555 strncat(list[n], p1, len);
3556 list[n++][name_len + len + 1] = '\0';
3557 p1 = p2;
3558 }
3559 if (p3 != inp[i]) free(p3);
3560 }
3561 list[n] = NULL;
3562 return list;
3563}
3564
3565/* Make new string for parser */
3566static char * make_string(char ** inp)
3567{
3568 char *p;
3569 char *str = NULL;
3570 int n;
3571 int len = 2;
3572
3573 for (n = 0; inp[n]; n++) {
3574 p = insert_var_value(inp[n]);
3575 str = xrealloc(str, (len + strlen(p)));
3576 if (n) {
3577 strcat(str, " ");
3578 } else {
3579 *str = '\0';
3580 }
3581 strcat(str, p);
3582 len = strlen(str) + 3;
3583 if (p != inp[n]) free(p);
3584 }
3585 len = strlen(str);
3586 *(str + len) = '\n';
3587 *(str + len + 1) = '\0';
3588 return str;
3589}
3590
3591#endif /* CFG_HUSH_PARSER */
3592/****************************************************************************/
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