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Merge with /home/wd/git/u-boot/custodian/u-boot-mpc83xx
[people/ms/u-boot.git] / common / hush.c
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fe8c2806
WD		 1/* vi: set sw=4 ts=4: */
2/*
3 * sh.c -- a prototype Bourne shell grammar parser
4 * Intended to follow the original Thompson and Ritchie
5 * "small and simple is beautiful" philosophy, which
6 * incidentally is a good match to today's BusyBox.
7 *
8 * Copyright (C) 2000,2001 Larry Doolittle <larry@doolittle.boa.org>
9 *
10 * Credits:
11 * The parser routines proper are all original material, first
12 * written Dec 2000 and Jan 2001 by Larry Doolittle.
13 * The execution engine, the builtins, and much of the underlying
14 * support has been adapted from busybox-0.49pre's lash,
15 * which is Copyright (C) 2000 by Lineo, Inc., and
16 * written by Erik Andersen <andersen@lineo.com>, <andersee@debian.org>.
17 * That, in turn, is based in part on ladsh.c, by Michael K. Johnson and
18 * Erik W. Troan, which they placed in the public domain. I don't know
19 * how much of the Johnson/Troan code has survived the repeated rewrites.
20 * Other credits:
21 * simple_itoa() was lifted from boa-0.93.15
22 * b_addchr() derived from similar w_addchar function in glibc-2.2
23 * setup_redirect(), redirect_opt_num(), and big chunks of main()
24 * and many builtins derived from contributions by Erik Andersen
25 * miscellaneous bugfixes from Matt Kraai
26 *
27 * There are two big (and related) architecture differences between
28 * this parser and the lash parser. One is that this version is
29 * actually designed from the ground up to understand nearly all
30 * of the Bourne grammar. The second, consequential change is that
31 * the parser and input reader have been turned inside out. Now,
32 * the parser is in control, and asks for input as needed. The old
33 * way had the input reader in control, and it asked for parsing to
34 * take place as needed. The new way makes it much easier to properly
35 * handle the recursion implicit in the various substitutions, especially
36 * across continuation lines.
37 *
38 * Bash grammar not implemented: (how many of these were in original sh?)
39 * $@ (those sure look like weird quoting rules)
40 * $_
41 * ! negation operator for pipes
42 * &> and >& redirection of stdout+stderr
43 * Brace Expansion
44 * Tilde Expansion
45 * fancy forms of Parameter Expansion
46 * aliases
47 * Arithmetic Expansion
48 * <(list) and >(list) Process Substitution
49 * reserved words: case, esac, select, function
50 * Here Documents ( << word )
51 * Functions
52 * Major bugs:
53 * job handling woefully incomplete and buggy
54 * reserved word execution woefully incomplete and buggy
55 * to-do:
56 * port selected bugfixes from post-0.49 busybox lash - done?
57 * finish implementing reserved words: for, while, until, do, done
58 * change { and } from special chars to reserved words
59 * builtins: break, continue, eval, return, set, trap, ulimit
60 * test magic exec
61 * handle children going into background
62 * clean up recognition of null pipes
63 * check setting of global_argc and global_argv
64 * control-C handling, probably with longjmp
65 * follow IFS rules more precisely, including update semantics
66 * figure out what to do with backslash-newline
67 * explain why we use signal instead of sigaction
68 * propagate syntax errors, die on resource errors?
69 * continuation lines, both explicit and implicit - done?
70 * memory leak finding and plugging - done?
71 * more testing, especially quoting rules and redirection
72 * document how quoting rules not precisely followed for variable assignments
73 * maybe change map[] to use 2-bit entries
74 * (eventually) remove all the printf's
75 *
76 * This program is free software; you can redistribute it and/or modify
77 * it under the terms of the GNU General Public License as published by
78 * the Free Software Foundation; either version 2 of the License, or
79 * (at your option) any later version.
80 *
81 * This program is distributed in the hope that it will be useful,
82 * but WITHOUT ANY WARRANTY; without even the implied warranty of
83 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
84 * General Public License for more details.
85 *
86 * You should have received a copy of the GNU General Public License
87 * along with this program; if not, write to the Free Software
88 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
89 */
90#define __U_BOOT__
91#ifdef __U_BOOT__
92#include <malloc.h> /* malloc, free, realloc*/
93#include <linux/ctype.h> /* isalpha, isdigit */
94#include <common.h> /* readline */
95#include <hush.h>
96#include <command.h> /* find_cmd */
8bde7f77
WD		 97/*cmd_boot.c*/
98extern int do_bootd (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]); /* do_bootd */
fe8c2806
WD		 99#endif
100#ifdef CFG_HUSH_PARSER
101#ifndef __U_BOOT__
102#include <ctype.h> /* isalpha, isdigit */
103#include <unistd.h> /* getpid */
104#include <stdlib.h> /* getenv, atoi */
105#include <string.h> /* strchr */
106#include <stdio.h> /* popen etc. */
107#include <glob.h> /* glob, of course */
108#include <stdarg.h> /* va_list */
109#include <errno.h>
110#include <fcntl.h>
111#include <getopt.h> /* should be pretty obvious */
112
113#include <sys/stat.h> /* ulimit */
114#include <sys/types.h>
115#include <sys/wait.h>
116#include <signal.h>
117
118/* #include <dmalloc.h> */
119/* #define DEBUG_SHELL */
120
d0fb80c3 121#if 1
fe8c2806
WD		 122#include "busybox.h"
123#include "cmdedit.h"
124#else
125#define applet_name "hush"
126#include "standalone.h"
127#define hush_main main
d0fb80c3
WD		 128#undef CONFIG_FEATURE_SH_FANCY_PROMPT
129#define BB_BANNER
fe8c2806
WD		 130#endif
131#endif
132#define SPECIAL_VAR_SYMBOL 03
133#ifndef __U_BOOT__
134#define FLAG_EXIT_FROM_LOOP 1
135#define FLAG_PARSE_SEMICOLON (1 << 1) /* symbol ';' is special for parser */
136#define FLAG_REPARSING (1 << 2) /* >= 2nd pass */
137
138#endif
139
140#ifdef __U_BOOT__
d87080b7
WD		 141DECLARE_GLOBAL_DATA_PTR;
142
fe8c2806
WD		 143#define EXIT_SUCCESS 0
144#define EOF -1
145#define syntax() syntax_err()
146#define xstrdup strdup
147#define error_msg printf
148#else
149typedef enum {
150 REDIRECT_INPUT = 1,
151 REDIRECT_OVERWRITE = 2,
152 REDIRECT_APPEND = 3,
153 REDIRECT_HEREIS = 4,
154 REDIRECT_IO = 5
155} redir_type;
156
157/* The descrip member of this structure is only used to make debugging
158 * output pretty */
159struct {int mode; int default_fd; char *descrip;} redir_table[] = {
160 { 0, 0, "()" },
161 { O_RDONLY, 0, "<" },
162 { O_CREAT|O_TRUNC|O_WRONLY, 1, ">" },
163 { O_CREAT|O_APPEND|O_WRONLY, 1, ">>" },
164 { O_RDONLY, -1, "<<" },
165 { O_RDWR, 1, "<>" }
166};
167#endif
168
169typedef enum {
170 PIPE_SEQ = 1,
171 PIPE_AND = 2,
172 PIPE_OR = 3,
173 PIPE_BG = 4,
174} pipe_style;
175
176/* might eventually control execution */
177typedef enum {
178 RES_NONE = 0,
179 RES_IF = 1,
180 RES_THEN = 2,
181 RES_ELIF = 3,
182 RES_ELSE = 4,
183 RES_FI = 5,
184 RES_FOR = 6,
185 RES_WHILE = 7,
186 RES_UNTIL = 8,
187 RES_DO = 9,
188 RES_DONE = 10,
189 RES_XXXX = 11,
190 RES_IN = 12,
191 RES_SNTX = 13
192} reserved_style;
193#define FLAG_END (1<<RES_NONE)
194#define FLAG_IF (1<<RES_IF)
195#define FLAG_THEN (1<<RES_THEN)
196#define FLAG_ELIF (1<<RES_ELIF)
197#define FLAG_ELSE (1<<RES_ELSE)
198#define FLAG_FI (1<<RES_FI)
199#define FLAG_FOR (1<<RES_FOR)
200#define FLAG_WHILE (1<<RES_WHILE)
201#define FLAG_UNTIL (1<<RES_UNTIL)
202#define FLAG_DO (1<<RES_DO)
203#define FLAG_DONE (1<<RES_DONE)
204#define FLAG_IN (1<<RES_IN)
205#define FLAG_START (1<<RES_XXXX)
206
207/* This holds pointers to the various results of parsing */
208struct p_context {
209 struct child_prog *child;
210 struct pipe *list_head;
211 struct pipe *pipe;
212#ifndef __U_BOOT__
213 struct redir_struct *pending_redirect;
214#endif
215 reserved_style w;
216 int old_flag; /* for figuring out valid reserved words */
217 struct p_context *stack;
218 int type; /* define type of parser : ";$" common or special symbol */
219 /* How about quoting status? */
220};
221
222#ifndef __U_BOOT__
223struct redir_struct {
224 redir_type type; /* type of redirection */
225 int fd; /* file descriptor being redirected */
226 int dup; /* -1, or file descriptor being duplicated */
227 struct redir_struct *next; /* pointer to the next redirect in the list */
228 glob_t word; /* *word.gl_pathv is the filename */
229};
230#endif
231
232struct child_prog {
233#ifndef __U_BOOT__
234 pid_t pid; /* 0 if exited */
235#endif
236 char **argv; /* program name and arguments */
237#ifdef __U_BOOT__
238 int argc; /* number of program arguments */
239#endif
240 struct pipe *group; /* if non-NULL, first in group or subshell */
241#ifndef __U_BOOT__
242 int subshell; /* flag, non-zero if group must be forked */
243 struct redir_struct *redirects; /* I/O redirections */
244 glob_t glob_result; /* result of parameter globbing */
245 int is_stopped; /* is the program currently running? */
246 struct pipe *family; /* pointer back to the child's parent pipe */
247#endif
248 int sp; /* number of SPECIAL_VAR_SYMBOL */
249 int type;
250};
251
252struct pipe {
253#ifndef __U_BOOT__
254 int jobid; /* job number */
255#endif
256 int num_progs; /* total number of programs in job */
257#ifndef __U_BOOT__
258 int running_progs; /* number of programs running */
259 char *text; /* name of job */
260 char *cmdbuf; /* buffer various argv's point into */
261 pid_t pgrp; /* process group ID for the job */
262#endif
263 struct child_prog *progs; /* array of commands in pipe */
264 struct pipe *next; /* to track background commands */
265#ifndef __U_BOOT__
266 int stopped_progs; /* number of programs alive, but stopped */
267 int job_context; /* bitmask defining current context */
268#endif
269 pipe_style followup; /* PIPE_BG, PIPE_SEQ, PIPE_OR, PIPE_AND */
270 reserved_style r_mode; /* supports if, for, while, until */
271};
272
273#ifndef __U_BOOT__
274struct close_me {
275 int fd;
276 struct close_me *next;
277};
278#endif
279
280struct variables {
281 char *name;
282 char *value;
283 int flg_export;
284 int flg_read_only;
285 struct variables *next;
286};
287
288/* globals, connect us to the outside world
289 * the first three support $?, $#, and $1 */
290#ifndef __U_BOOT__
291char **global_argv;
292unsigned int global_argc;
293#endif
294unsigned int last_return_code;
c26e454d 295int nesting_level;
fe8c2806
WD		 296#ifndef __U_BOOT__
297extern char **environ; /* This is in <unistd.h>, but protected with __USE_GNU */
298#endif
299
300/* "globals" within this file */
77ddac94 301static uchar *ifs;
fe8c2806
WD		 302static char map[256];
303#ifndef __U_BOOT__
304static int fake_mode;
305static int interactive;
306static struct close_me *close_me_head;
307static const char *cwd;
308static struct pipe *job_list;
309static unsigned int last_bg_pid;
310static unsigned int last_jobid;
311static unsigned int shell_terminal;
312static char *PS1;
313static char *PS2;
314struct variables shell_ver = { "HUSH_VERSION", "0.01", 1, 1, 0 };
315struct variables *top_vars = &shell_ver;
316#else
317static int flag_repeat = 0;
318static int do_repeat = 0;
2d5b561e 319static struct variables *top_vars = NULL ;
fe8c2806
WD		 320#endif /*__U_BOOT__ */
321
322#define B_CHUNK (100)
323#define B_NOSPAC 1
324
325typedef struct {
326 char *data;
327 int length;
328 int maxlen;
329 int quote;
330 int nonnull;
331} o_string;
332#define NULL_O_STRING {NULL,0,0,0,0}
333/* used for initialization:
334 o_string foo = NULL_O_STRING; */
335
336/* I can almost use ordinary FILE *. Is open_memstream() universally
337 * available? Where is it documented? */
338struct in_str {
339 const char *p;
340#ifndef __U_BOOT__
341 char peek_buf[2];
342#endif
343 int __promptme;
344 int promptmode;
345#ifndef __U_BOOT__
346 FILE *file;
347#endif
348 int (*get) (struct in_str *);
349 int (*peek) (struct in_str *);
350};
351#define b_getch(input) ((input)->get(input))
352#define b_peek(input) ((input)->peek(input))
353
354#ifndef __U_BOOT__
355#define JOB_STATUS_FORMAT "[%d] %-22s %.40s\n"
356
357struct built_in_command {
358 char *cmd; /* name */
359 char *descr; /* description */
360 int (*function) (struct child_prog *); /* function ptr */
361};
362#endif
363
fe8c2806
WD		 364/* This should be in utility.c */
365#ifdef DEBUG_SHELL
366#ifndef __U_BOOT__
367static void debug_printf(const char *format, ...)
368{
369 va_list args;
370 va_start(args, format);
371 vfprintf(stderr, format, args);
372 va_end(args);
373}
374#else
375#define debug_printf printf /* U-Boot debug flag */
376#endif
377#else
378static inline void debug_printf(const char *format, ...) { }
379#endif
380#define final_printf debug_printf
381
382#ifdef __U_BOOT__
383static void syntax_err(void) {
384 printf("syntax error\n");
385}
386#else
387static void __syntax(char *file, int line) {
388 error_msg("syntax error %s:%d", file, line);
389}
390#define syntax() __syntax(__FILE__, __LINE__)
391#endif
392
393#ifdef __U_BOOT__
394static void *xmalloc(size_t size);
395static void *xrealloc(void *ptr, size_t size);
396#else
397/* Index of subroutines: */
398/* function prototypes for builtins */
399static int builtin_cd(struct child_prog *child);
400static int builtin_env(struct child_prog *child);
401static int builtin_eval(struct child_prog *child);
402static int builtin_exec(struct child_prog *child);
403static int builtin_exit(struct child_prog *child);
404static int builtin_export(struct child_prog *child);
405static int builtin_fg_bg(struct child_prog *child);
406static int builtin_help(struct child_prog *child);
407static int builtin_jobs(struct child_prog *child);
408static int builtin_pwd(struct child_prog *child);
409static int builtin_read(struct child_prog *child);
410static int builtin_set(struct child_prog *child);
411static int builtin_shift(struct child_prog *child);
412static int builtin_source(struct child_prog *child);
413static int builtin_umask(struct child_prog *child);
414static int builtin_unset(struct child_prog *child);
415static int builtin_not_written(struct child_prog *child);
416#endif
417/* o_string manipulation: */
418static int b_check_space(o_string *o, int len);
419static int b_addchr(o_string *o, int ch);
420static void b_reset(o_string *o);
421static int b_addqchr(o_string *o, int ch, int quote);
c26e454d 422#ifndef __U_BOOT__
fe8c2806 423static int b_adduint(o_string *o, unsigned int i);
c26e454d 424#endif
fe8c2806
WD		 425/* in_str manipulations: */
426static int static_get(struct in_str *i);
427static int static_peek(struct in_str *i);
428static int file_get(struct in_str *i);
429static int file_peek(struct in_str *i);
430#ifndef __U_BOOT__
431static void setup_file_in_str(struct in_str *i, FILE *f);
432#else
433static void setup_file_in_str(struct in_str *i);
434#endif
435static void setup_string_in_str(struct in_str *i, const char *s);
436#ifndef __U_BOOT__
437/* close_me manipulations: */
438static void mark_open(int fd);
439static void mark_closed(int fd);
d0fb80c3 440static void close_all(void);
fe8c2806
WD		 441#endif
442/* "run" the final data structures: */
443static char *indenter(int i);
444static int free_pipe_list(struct pipe *head, int indent);
445static int free_pipe(struct pipe *pi, int indent);
446/* really run the final data structures: */
447#ifndef __U_BOOT__
448static int setup_redirects(struct child_prog *prog, int squirrel[]);
449#endif
450static int run_list_real(struct pipe *pi);
451#ifndef __U_BOOT__
452static void pseudo_exec(struct child_prog *child) __attribute__ ((noreturn));
453#endif
454static int run_pipe_real(struct pipe *pi);
455/* extended glob support: */
456#ifndef __U_BOOT__
457static int globhack(const char *src, int flags, glob_t *pglob);
458static int glob_needed(const char *s);
459static int xglob(o_string *dest, int flags, glob_t *pglob);
460#endif
461/* variable assignment: */
462static int is_assignment(const char *s);
463/* data structure manipulation: */
464#ifndef __U_BOOT__
465static int setup_redirect(struct p_context *ctx, int fd, redir_type style, struct in_str *input);
466#endif
467static void initialize_context(struct p_context *ctx);
468static int done_word(o_string *dest, struct p_context *ctx);
469static int done_command(struct p_context *ctx);
470static int done_pipe(struct p_context *ctx, pipe_style type);
471/* primary string parsing: */
472#ifndef __U_BOOT__
473static int redirect_dup_num(struct in_str *input);
474static int redirect_opt_num(o_string *o);
475static int process_command_subs(o_string *dest, struct p_context *ctx, struct in_str *input, int subst_end);
476static int parse_group(o_string *dest, struct p_context *ctx, struct in_str *input, int ch);
477#endif
478static char *lookup_param(char *src);
479static char *make_string(char **inp);
480static int handle_dollar(o_string *dest, struct p_context *ctx, struct in_str *input);
481#ifndef __U_BOOT__
482static int parse_string(o_string *dest, struct p_context *ctx, const char *src);
483#endif
484static int parse_stream(o_string *dest, struct p_context *ctx, struct in_str *input0, int end_trigger);
485/* setup: */
486static int parse_stream_outer(struct in_str *inp, int flag);
487#ifndef __U_BOOT__
488static int parse_string_outer(const char *s, int flag);
489static int parse_file_outer(FILE *f);
490#endif
491#ifndef __U_BOOT__
492/* job management: */
493static int checkjobs(struct pipe* fg_pipe);
494static void insert_bg_job(struct pipe *pi);
495static void remove_bg_job(struct pipe *pi);
496#endif
497/* local variable support */
498static char **make_list_in(char **inp, char *name);
499static char *insert_var_value(char *inp);
500static char *get_local_var(const char *var);
501#ifndef __U_BOOT__
502static void unset_local_var(const char *name);
503#endif
504static int set_local_var(const char *s, int flg_export);
505
506#ifndef __U_BOOT__
507/* Table of built-in functions. They can be forked or not, depending on
508 * context: within pipes, they fork. As simple commands, they do not.
509 * When used in non-forking context, they can change global variables
510 * in the parent shell process. If forked, of course they can not.
511 * For example, 'unset foo | whatever' will parse and run, but foo will
512 * still be set at the end. */
513static struct built_in_command bltins[] = {
514 {"bg", "Resume a job in the background", builtin_fg_bg},
515 {"break", "Exit for, while or until loop", builtin_not_written},
516 {"cd", "Change working directory", builtin_cd},
517 {"continue", "Continue for, while or until loop", builtin_not_written},
518 {"env", "Print all environment variables", builtin_env},
519 {"eval", "Construct and run shell command", builtin_eval},
520 {"exec", "Exec command, replacing this shell with the exec'd process",
521 builtin_exec},
522 {"exit", "Exit from shell()", builtin_exit},
523 {"export", "Set environment variable", builtin_export},
524 {"fg", "Bring job into the foreground", builtin_fg_bg},
525 {"jobs", "Lists the active jobs", builtin_jobs},
526 {"pwd", "Print current directory", builtin_pwd},
527 {"read", "Input environment variable", builtin_read},
528 {"return", "Return from a function", builtin_not_written},
529 {"set", "Set/unset shell local variables", builtin_set},
530 {"shift", "Shift positional parameters", builtin_shift},
531 {"trap", "Trap signals", builtin_not_written},
532 {"ulimit","Controls resource limits", builtin_not_written},
533 {"umask","Sets file creation mask", builtin_umask},
534 {"unset", "Unset environment variable", builtin_unset},
535 {".", "Source-in and run commands in a file", builtin_source},
536 {"help", "List shell built-in commands", builtin_help},
537 {NULL, NULL, NULL}
538};
539
540static const char *set_cwd(void)
541{
542 if(cwd==unknown)
543 cwd = NULL; /* xgetcwd(arg) called free(arg) */
544 cwd = xgetcwd((char *)cwd);
545 if (!cwd)
546 cwd = unknown;
547 return cwd;
548}
549
550/* built-in 'eval' handler */
551static int builtin_eval(struct child_prog *child)
552{
553 char *str = NULL;
554 int rcode = EXIT_SUCCESS;
555
556 if (child->argv[1]) {
557 str = make_string(child->argv + 1);
558 parse_string_outer(str, FLAG_EXIT_FROM_LOOP |
559 FLAG_PARSE_SEMICOLON);
560 free(str);
561 rcode = last_return_code;
562 }
563 return rcode;
564}
565
566/* built-in 'cd <path>' handler */
567static int builtin_cd(struct child_prog *child)
568{
569 char *newdir;
570 if (child->argv[1] == NULL)
571 newdir = getenv("HOME");
572 else
573 newdir = child->argv[1];
574 if (chdir(newdir)) {
575 printf("cd: %s: %s\n", newdir, strerror(errno));
576 return EXIT_FAILURE;
577 }
578 set_cwd();
579 return EXIT_SUCCESS;
580}
581
582/* built-in 'env' handler */
583static int builtin_env(struct child_prog *dummy)
584{
585 char **e = environ;
586 if (e == NULL) return EXIT_FAILURE;
587 for (; *e; e++) {
588 puts(*e);
589 }
590 return EXIT_SUCCESS;
591}
592
593/* built-in 'exec' handler */
594static int builtin_exec(struct child_prog *child)
595{
596 if (child->argv[1] == NULL)
597 return EXIT_SUCCESS; /* Really? */
598 child->argv++;
599 pseudo_exec(child);
600 /* never returns */
601}
602
603/* built-in 'exit' handler */
604static int builtin_exit(struct child_prog *child)
605{
606 if (child->argv[1] == NULL)
607 exit(last_return_code);
608 exit (atoi(child->argv[1]));
609}
610
611/* built-in 'export VAR=value' handler */
612static int builtin_export(struct child_prog *child)
613{
614 int res = 0;
615 char *name = child->argv[1];
616
617 if (name == NULL) {
618 return (builtin_env(child));
619 }
620
621 name = strdup(name);
622
623 if(name) {
624 char *value = strchr(name, '=');
625
626 if (!value) {
627 char *tmp;
628 /* They are exporting something without an =VALUE */
629
630 value = get_local_var(name);
631 if (value) {
632 size_t ln = strlen(name);
633
634 tmp = realloc(name, ln+strlen(value)+2);
635 if(tmp==NULL)
636 res = -1;
637 else {
638 sprintf(tmp+ln, "=%s", value);
639 name = tmp;
640 }
641 } else {
642 /* bash does not return an error when trying to export
643 * an undefined variable. Do likewise. */
644 res = 1;
645 }
646 }
647 }
648 if (res<0)
649 perror_msg("export");
650 else if(res==0)
651 res = set_local_var(name, 1);
652 else
653 res = 0;
654 free(name);
655 return res;
656}
657
658/* built-in 'fg' and 'bg' handler */
659static int builtin_fg_bg(struct child_prog *child)
660{
661 int i, jobnum;
662 struct pipe *pi=NULL;
663
664 if (!interactive)
665 return EXIT_FAILURE;
666 /* If they gave us no args, assume they want the last backgrounded task */
667 if (!child->argv[1]) {
668 for (pi = job_list; pi; pi = pi->next) {
669 if (pi->jobid == last_jobid) {
670 break;
671 }
672 }
673 if (!pi) {
674 error_msg("%s: no current job", child->argv[0]);
675 return EXIT_FAILURE;
676 }
677 } else {
678 if (sscanf(child->argv[1], "%%%d", &jobnum) != 1) {
679 error_msg("%s: bad argument '%s'", child->argv[0], child->argv[1]);
680 return EXIT_FAILURE;
681 }
682 for (pi = job_list; pi; pi = pi->next) {
683 if (pi->jobid == jobnum) {
684 break;
685 }
686 }
687 if (!pi) {
688 error_msg("%s: %d: no such job", child->argv[0], jobnum);
689 return EXIT_FAILURE;
690 }
691 }
692
693 if (*child->argv[0] == 'f') {
694 /* Put the job into the foreground. */
695 tcsetpgrp(shell_terminal, pi->pgrp);
696 }
697
698 /* Restart the processes in the job */
699 for (i = 0; i < pi->num_progs; i++)
700 pi->progs[i].is_stopped = 0;
701
702 if ( (i=kill(- pi->pgrp, SIGCONT)) < 0) {
703 if (i == ESRCH) {
704 remove_bg_job(pi);
705 } else {
706 perror_msg("kill (SIGCONT)");
707 }
708 }
709
710 pi->stopped_progs = 0;
711 return EXIT_SUCCESS;
712}
713
714/* built-in 'help' handler */
715static int builtin_help(struct child_prog *dummy)
716{
717 struct built_in_command *x;
718
719 printf("\nBuilt-in commands:\n");
720 printf("-------------------\n");
721 for (x = bltins; x->cmd; x++) {
722 if (x->descr==NULL)
723 continue;
724 printf("%s\t%s\n", x->cmd, x->descr);
725 }
726 printf("\n\n");
727 return EXIT_SUCCESS;
728}
729
730/* built-in 'jobs' handler */
731static int builtin_jobs(struct child_prog *child)
732{
733 struct pipe *job;
734 char *status_string;
735
736 for (job = job_list; job; job = job->next) {
737 if (job->running_progs == job->stopped_progs)
738 status_string = "Stopped";
739 else
740 status_string = "Running";
741
742 printf(JOB_STATUS_FORMAT, job->jobid, status_string, job->text);
743 }
744 return EXIT_SUCCESS;
745}
746
747
748/* built-in 'pwd' handler */
749static int builtin_pwd(struct child_prog *dummy)
750{
751 puts(set_cwd());
752 return EXIT_SUCCESS;
753}
754
755/* built-in 'read VAR' handler */
756static int builtin_read(struct child_prog *child)
757{
758 int res;
759
760 if (child->argv[1]) {
761 char string[BUFSIZ];
762 char *var = 0;
763
764 string[0] = 0; /* In case stdin has only EOF */
765 /* read string */
766 fgets(string, sizeof(string), stdin);
767 chomp(string);
768 var = malloc(strlen(child->argv[1])+strlen(string)+2);
769 if(var) {
770 sprintf(var, "%s=%s", child->argv[1], string);
771 res = set_local_var(var, 0);
772 } else
773 res = -1;
774 if (res)
775 fprintf(stderr, "read: %m\n");
776 free(var); /* So not move up to avoid breaking errno */
777 return res;
778 } else {
779 do res=getchar(); while(res!='\n' && res!=EOF);
780 return 0;
781 }
782}
783
784/* built-in 'set VAR=value' handler */
785static int builtin_set(struct child_prog *child)
786{
787 char *temp = child->argv[1];
788 struct variables *e;
789
790 if (temp == NULL)
791 for(e = top_vars; e; e=e->next)
792 printf("%s=%s\n", e->name, e->value);
793 else
794 set_local_var(temp, 0);
795
796 return EXIT_SUCCESS;
797}
798
799
800/* Built-in 'shift' handler */
801static int builtin_shift(struct child_prog *child)
802{
803 int n=1;
804 if (child->argv[1]) {
805 n=atoi(child->argv[1]);
806 }
807 if (n>=0 && n<global_argc) {
808 /* XXX This probably breaks $0 */
809 global_argc -= n;
810 global_argv += n;
811 return EXIT_SUCCESS;
812 } else {
813 return EXIT_FAILURE;
814 }
815}
816
817/* Built-in '.' handler (read-in and execute commands from file) */
818static int builtin_source(struct child_prog *child)
819{
820 FILE *input;
821 int status;
822
823 if (child->argv[1] == NULL)
824 return EXIT_FAILURE;
825
826 /* XXX search through $PATH is missing */
827 input = fopen(child->argv[1], "r");
828 if (!input) {
829 error_msg("Couldn't open file '%s'", child->argv[1]);
830 return EXIT_FAILURE;
831 }
832
833 /* Now run the file */
834 /* XXX argv and argc are broken; need to save old global_argv
835 * (pointer only is OK!) on this stack frame,
836 * set global_argv=child->argv+1, recurse, and restore. */
837 mark_open(fileno(input));
838 status = parse_file_outer(input);
839 mark_closed(fileno(input));
840 fclose(input);
841 return (status);
842}
843
844static int builtin_umask(struct child_prog *child)
845{
846 mode_t new_umask;
847 const char *arg = child->argv[1];
848 char *end;
849 if (arg) {
850 new_umask=strtoul(arg, &end, 8);
851 if (*end!='\0' || end == arg) {
852 return EXIT_FAILURE;
853 }
854 } else {
855 printf("%.3o\n", (unsigned int) (new_umask=umask(0)));
856 }
857 umask(new_umask);
858 return EXIT_SUCCESS;
859}
860
861/* built-in 'unset VAR' handler */
862static int builtin_unset(struct child_prog *child)
863{
864 /* bash returned already true */
865 unset_local_var(child->argv[1]);
866 return EXIT_SUCCESS;
867}
868
869static int builtin_not_written(struct child_prog *child)
870{
871 printf("builtin_%s not written\n",child->argv[0]);
872 return EXIT_FAILURE;
873}
874#endif
875
876static int b_check_space(o_string *o, int len)
877{
878 /* It would be easy to drop a more restrictive policy
879 * in here, such as setting a maximum string length */
880 if (o->length + len > o->maxlen) {
881 char *old_data = o->data;
882 /* assert (data == NULL || o->maxlen != 0); */
883 o->maxlen += max(2*len, B_CHUNK);
884 o->data = realloc(o->data, 1 + o->maxlen);
885 if (o->data == NULL) {
886 free(old_data);
887 }
888 }
889 return o->data == NULL;
890}
891
892static int b_addchr(o_string *o, int ch)
893{
894 debug_printf("b_addchr: %c %d %p\n", ch, o->length, o);
895 if (b_check_space(o, 1)) return B_NOSPAC;
896 o->data[o->length] = ch;
897 o->length++;
898 o->data[o->length] = '\0';
899 return 0;
900}
901
902static void b_reset(o_string *o)
903{
904 o->length = 0;
905 o->nonnull = 0;
906 if (o->data != NULL) *o->data = '\0';
907}
908
909static void b_free(o_string *o)
910{
911 b_reset(o);
d0fb80c3 912 free(o->data);
fe8c2806
WD		 913 o->data = NULL;
914 o->maxlen = 0;
915}
916
917/* My analysis of quoting semantics tells me that state information
918 * is associated with a destination, not a source.
919 */
920static int b_addqchr(o_string *o, int ch, int quote)
921{
922 if (quote && strchr("*?[\\",ch)) {
923 int rc;
924 rc = b_addchr(o, '\\');
925 if (rc) return rc;
926 }
927 return b_addchr(o, ch);
928}
929
930/* belongs in utility.c */
931char *simple_itoa(unsigned int i)
932{
933 /* 21 digits plus null terminator, good for 64-bit or smaller ints */
934 static char local[22];
935 char *p = &local[21];
936 *p-- = '\0';
937 do {
938 *p-- = '0' + i % 10;
939 i /= 10;
940 } while (i > 0);
941 return p + 1;
942}
943
c26e454d 944#ifndef __U_BOOT__
fe8c2806
WD		 945static int b_adduint(o_string *o, unsigned int i)
946{
947 int r;
948 char *p = simple_itoa(i);
949 /* no escape checking necessary */
950 do r=b_addchr(o, *p++); while (r==0 && *p);
951 return r;
952}
c26e454d 953#endif
fe8c2806
WD		 954
955static int static_get(struct in_str *i)
956{
957 int ch=*i->p++;
958 if (ch=='\0') return EOF;
959 return ch;
960}
961
962static int static_peek(struct in_str *i)
963{
964 return *i->p;
965}
966
967#ifndef __U_BOOT__
968static inline void cmdedit_set_initial_prompt(void)
969{
d0fb80c3 970#ifndef CONFIG_FEATURE_SH_FANCY_PROMPT
fe8c2806
WD		 971 PS1 = NULL;
972#else
973 PS1 = getenv("PS1");
974 if(PS1==0)
975 PS1 = "\\w \\$ ";
976#endif
977}
978
979static inline void setup_prompt_string(int promptmode, char **prompt_str)
980{
981 debug_printf("setup_prompt_string %d ",promptmode);
d0fb80c3 982#ifndef CONFIG_FEATURE_SH_FANCY_PROMPT
fe8c2806
WD		 983 /* Set up the prompt */
984 if (promptmode == 1) {
d0fb80c3 985 free(PS1);
fe8c2806
WD		 986 PS1=xmalloc(strlen(cwd)+4);
987 sprintf(PS1, "%s %s", cwd, ( geteuid() != 0 ) ? "$ ":"# ");
988 *prompt_str = PS1;
989 } else {
990 *prompt_str = PS2;
991 }
992#else
993 *prompt_str = (promptmode==1)? PS1 : PS2;
994#endif
995 debug_printf("result %s\n",*prompt_str);
996}
997#endif
998
999static void get_user_input(struct in_str *i)
1000{
1001#ifndef __U_BOOT__
1002 char *prompt_str;
1003 static char the_command[BUFSIZ];
1004
1005 setup_prompt_string(i->promptmode, &prompt_str);
d0fb80c3 1006#ifdef CONFIG_FEATURE_COMMAND_EDITING
fe8c2806
WD		 1007 /*
1008 ** enable command line editing only while a command line
1009 ** is actually being read; otherwise, we'll end up bequeathing
1010 ** atexit() handlers and other unwanted stuff to our
1011 ** child processes (rob@sysgo.de)
1012 */
1013 cmdedit_read_input(prompt_str, the_command);
1014#else
1015 fputs(prompt_str, stdout);
1016 fflush(stdout);
1017 the_command[0]=fgetc(i->file);
1018 the_command[1]='\0';
1019#endif
1020 fflush(stdout);
1021 i->p = the_command;
1022#else
1023 extern char console_buffer[CFG_CBSIZE];
1024 int n;
1025 static char the_command[CFG_CBSIZE];
1026
396387ab
WD		 1027#ifdef CONFIG_BOOT_RETRY_TIME
1028# ifdef CONFIG_RESET_TO_RETRY
1029 extern int do_reset (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]);
1030# else
1031# error "This currently only works with CONFIG_RESET_TO_RETRY enabled"
1032# endif
1033 reset_cmd_timeout();
1034#endif
fe8c2806
WD		 1035 i->__promptme = 1;
1036 if (i->promptmode == 1) {
1037 n = readline(CFG_PROMPT);
1038 } else {
1039 n = readline(CFG_PROMPT_HUSH_PS2);
1040 }
396387ab
WD		 1041#ifdef CONFIG_BOOT_RETRY_TIME
1042 if (n == -2) {
1043 puts("\nTimeout waiting for command\n");
1044# ifdef CONFIG_RESET_TO_RETRY
1045 do_reset(NULL, 0, 0, NULL);
1046# else
1047# error "This currently only works with CONFIG_RESET_TO_RETRY enabled"
1048# endif
1049 }
1050#endif
fe8c2806
WD		 1051 if (n == -1 ) {
1052 flag_repeat = 0;
1053 i->__promptme = 0;
1054 }
1055 n = strlen(console_buffer);
1056 console_buffer[n] = '\n';
1057 console_buffer[n+1]= '\0';
1058 if (had_ctrlc()) flag_repeat = 0;
1059 clear_ctrlc();
1060 do_repeat = 0;
1061 if (i->promptmode == 1) {
1062 if (console_buffer[0] == '\n'&& flag_repeat == 0) {
1063 strcpy(the_command,console_buffer);
1064 }
1065 else {
1066 if (console_buffer[0] != '\n') {
1067 strcpy(the_command,console_buffer);
1068 flag_repeat = 1;
1069 }
1070 else {
1071 do_repeat = 1;
1072 }
1073 }
1074 i->p = the_command;
1075 }
1076 else {
8bde7f77
WD		 1077 if (console_buffer[0] != '\n') {
1078 if (strlen(the_command) + strlen(console_buffer)
fe8c2806 1079 < CFG_CBSIZE) {
8bde7f77
WD		 1080 n = strlen(the_command);
1081 the_command[n-1] = ' ';
1082 strcpy(&the_command[n],console_buffer);
fe8c2806
WD		 1083 }
1084 else {
1085 the_command[0] = '\n';
1086 the_command[1] = '\0';
1087 flag_repeat = 0;
1088 }
1089 }
1090 if (i->__promptme == 0) {
1091 the_command[0] = '\n';
1092 the_command[1] = '\0';
1093 }
1094 i->p = console_buffer;
1095 }
1096#endif
1097}
1098
1099/* This is the magic location that prints prompts
1100 * and gets data back from the user */
1101static int file_get(struct in_str *i)
1102{
1103 int ch;
1104
1105 ch = 0;
1106 /* If there is data waiting, eat it up */
1107 if (i->p && *i->p) {
1108 ch=*i->p++;
1109 } else {
1110 /* need to double check i->file because we might be doing something
1111 * more complicated by now, like sourcing or substituting. */
1112#ifndef __U_BOOT__
1113 if (i->__promptme && interactive && i->file == stdin) {
1114 while(! i->p || (interactive && strlen(i->p)==0) ) {
1115#else
1116 while(! i->p || strlen(i->p)==0 ) {
1117#endif
1118 get_user_input(i);
1119 }
1120 i->promptmode=2;
1121#ifndef __U_BOOT__
1122 i->__promptme = 0;
1123#endif
1124 if (i->p && *i->p) {
1125 ch=*i->p++;
1126 }
1127#ifndef __U_BOOT__
1128 } else {
1129 ch = fgetc(i->file);
1130 }
1131
1132#endif
1133 debug_printf("b_getch: got a %d\n", ch);
1134 }
1135#ifndef __U_BOOT__
1136 if (ch == '\n') i->__promptme=1;
1137#endif
1138 return ch;
1139}
1140
1141/* All the callers guarantee this routine will never be
1142 * used right after a newline, so prompting is not needed.
1143 */
1144static int file_peek(struct in_str *i)
1145{
1146#ifndef __U_BOOT__
1147 if (i->p && *i->p) {
1148#endif
1149 return *i->p;
1150#ifndef __U_BOOT__
1151 } else {
1152 i->peek_buf[0] = fgetc(i->file);
1153 i->peek_buf[1] = '\0';
1154 i->p = i->peek_buf;
1155 debug_printf("b_peek: got a %d\n", *i->p);
1156 return *i->p;
1157 }
1158#endif
1159}
1160
1161#ifndef __U_BOOT__
1162static void setup_file_in_str(struct in_str *i, FILE *f)
1163#else
1164static void setup_file_in_str(struct in_str *i)
1165#endif
1166{
1167 i->peek = file_peek;
1168 i->get = file_get;
1169 i->__promptme=1;
1170 i->promptmode=1;
1171#ifndef __U_BOOT__
1172 i->file = f;
1173#endif
1174 i->p = NULL;
1175}
1176
1177static void setup_string_in_str(struct in_str *i, const char *s)
1178{
1179 i->peek = static_peek;
1180 i->get = static_get;
1181 i->__promptme=1;
1182 i->promptmode=1;
1183 i->p = s;
1184}
1185
1186#ifndef __U_BOOT__
1187static void mark_open(int fd)
1188{
1189 struct close_me *new = xmalloc(sizeof(struct close_me));
1190 new->fd = fd;
1191 new->next = close_me_head;
1192 close_me_head = new;
1193}
1194
1195static void mark_closed(int fd)
1196{
1197 struct close_me *tmp;
1198 if (close_me_head == NULL || close_me_head->fd != fd)
1199 error_msg_and_die("corrupt close_me");
1200 tmp = close_me_head;
1201 close_me_head = close_me_head->next;
1202 free(tmp);
1203}
1204
d0fb80c3 1205static void close_all(void)
fe8c2806
WD		 1206{
1207 struct close_me *c;
1208 for (c=close_me_head; c; c=c->next) {
1209 close(c->fd);
1210 }
1211 close_me_head = NULL;
1212}
1213
1214/* squirrel != NULL means we squirrel away copies of stdin, stdout,
1215 * and stderr if they are redirected. */
1216static int setup_redirects(struct child_prog *prog, int squirrel[])
1217{
1218 int openfd, mode;
1219 struct redir_struct *redir;
1220
1221 for (redir=prog->redirects; redir; redir=redir->next) {
1222 if (redir->dup == -1 && redir->word.gl_pathv == NULL) {
1223 /* something went wrong in the parse. Pretend it didn't happen */
1224 continue;
1225 }
1226 if (redir->dup == -1) {
1227 mode=redir_table[redir->type].mode;
1228 openfd = open(redir->word.gl_pathv[0], mode, 0666);
1229 if (openfd < 0) {
1230 /* this could get lost if stderr has been redirected, but
1231 bash and ash both lose it as well (though zsh doesn't!) */
1232 perror_msg("error opening %s", redir->word.gl_pathv[0]);
1233 return 1;
1234 }
1235 } else {
1236 openfd = redir->dup;
1237 }
1238
1239 if (openfd != redir->fd) {
1240 if (squirrel && redir->fd < 3) {
1241 squirrel[redir->fd] = dup(redir->fd);
1242 }
1243 if (openfd == -3) {
1244 close(openfd);
1245 } else {
1246 dup2(openfd, redir->fd);
1247 if (redir->dup == -1)
1248 close (openfd);
1249 }
1250 }
1251 }
1252 return 0;
1253}
1254
1255static void restore_redirects(int squirrel[])
1256{
1257 int i, fd;
1258 for (i=0; i<3; i++) {
1259 fd = squirrel[i];
1260 if (fd != -1) {
1261 /* No error checking. I sure wouldn't know what
1262 * to do with an error if I found one! */
1263 dup2(fd, i);
1264 close(fd);
1265 }
1266 }
1267}
1268
1269/* never returns */
1270/* XXX no exit() here. If you don't exec, use _exit instead.
1271 * The at_exit handlers apparently confuse the calling process,
1272 * in particular stdin handling. Not sure why? */
1273static void pseudo_exec(struct child_prog *child)
1274{
1275 int i, rcode;
1276 char *p;
1277 struct built_in_command *x;
1278 if (child->argv) {
1279 for (i=0; is_assignment(child->argv[i]); i++) {
1280 debug_printf("pid %d environment modification: %s\n",getpid(),child->argv[i]);
1281 p = insert_var_value(child->argv[i]);
1282 putenv(strdup(p));
1283 if (p != child->argv[i]) free(p);
1284 }
1285 child->argv+=i; /* XXX this hack isn't so horrible, since we are about
8bde7f77
WD		 1286 to exit, and therefore don't need to keep data
1287 structures consistent for free() use. */
fe8c2806
WD		 1288 /* If a variable is assigned in a forest, and nobody listens,
1289 * was it ever really set?
1290 */
1291 if (child->argv[0] == NULL) {
1292 _exit(EXIT_SUCCESS);
1293 }
1294
1295 /*
1296 * Check if the command matches any of the builtins.
1297 * Depending on context, this might be redundant. But it's
1298 * easier to waste a few CPU cycles than it is to figure out
1299 * if this is one of those cases.
1300 */
1301 for (x = bltins; x->cmd; x++) {
1302 if (strcmp(child->argv[0], x->cmd) == 0 ) {
1303 debug_printf("builtin exec %s\n", child->argv[0]);
1304 rcode = x->function(child);
1305 fflush(stdout);
1306 _exit(rcode);
1307 }
1308 }
1309
1310 /* Check if the command matches any busybox internal commands
1311 * ("applets") here.
1312 * FIXME: This feature is not 100% safe, since
1313 * BusyBox is not fully reentrant, so we have no guarantee the things
1314 * from the .bss are still zeroed, or that things from .data are still
1315 * at their defaults. We could exec ourself from /proc/self/exe, but I
1316 * really dislike relying on /proc for things. We could exec ourself
1317 * from global_argv[0], but if we are in a chroot, we may not be able
1318 * to find ourself... */
d0fb80c3 1319#ifdef CONFIG_FEATURE_SH_STANDALONE_SHELL
fe8c2806
WD		 1320 {
1321 int argc_l;
1322 char** argv_l=child->argv;
1323 char *name = child->argv[0];
1324
d0fb80c3 1325#ifdef CONFIG_FEATURE_SH_APPLETS_ALWAYS_WIN
fe8c2806
WD		 1326 /* Following discussions from November 2000 on the busybox mailing
1327 * list, the default configuration, (without
1328 * get_last_path_component()) lets the user force use of an
1329 * external command by specifying the full (with slashes) filename.
d0fb80c3 1330 * If you enable CONFIG_FEATURE_SH_APPLETS_ALWAYS_WIN then applets
fe8c2806
WD		 1331 * _aways_ override external commands, so if you want to run
1332 * /bin/cat, it will use BusyBox cat even if /bin/cat exists on the
1333 * filesystem and is _not_ busybox. Some systems may want this,
1334 * most do not. */
1335 name = get_last_path_component(name);
1336#endif
1337 /* Count argc for use in a second... */
1338 for(argc_l=0;*argv_l!=NULL; argv_l++, argc_l++);
1339 optind = 1;
1340 debug_printf("running applet %s\n", name);
1341 run_applet_by_name(name, argc_l, child->argv);
1342 }
1343#endif
1344 debug_printf("exec of %s\n",child->argv[0]);
1345 execvp(child->argv[0],child->argv);
1346 perror_msg("couldn't exec: %s",child->argv[0]);
1347 _exit(1);
1348 } else if (child->group) {
1349 debug_printf("runtime nesting to group\n");
1350 interactive=0; /* crucial!!!! */
1351 rcode = run_list_real(child->group);
1352 /* OK to leak memory by not calling free_pipe_list,
1353 * since this process is about to exit */
1354 _exit(rcode);
1355 } else {
1356 /* Can happen. See what bash does with ">foo" by itself. */
1357 debug_printf("trying to pseudo_exec null command\n");
1358 _exit(EXIT_SUCCESS);
1359 }
1360}
1361
1362static void insert_bg_job(struct pipe *pi)
1363{
1364 struct pipe *thejob;
1365
1366 /* Linear search for the ID of the job to use */
1367 pi->jobid = 1;
1368 for (thejob = job_list; thejob; thejob = thejob->next)
1369 if (thejob->jobid >= pi->jobid)
1370 pi->jobid = thejob->jobid + 1;
1371
1372 /* add thejob to the list of running jobs */
1373 if (!job_list) {
1374 thejob = job_list = xmalloc(sizeof(*thejob));
1375 } else {
1376 for (thejob = job_list; thejob->next; thejob = thejob->next) /* nothing */;
1377 thejob->next = xmalloc(sizeof(*thejob));
1378 thejob = thejob->next;
1379 }
1380
1381 /* physically copy the struct job */
1382 memcpy(thejob, pi, sizeof(struct pipe));
1383 thejob->next = NULL;
1384 thejob->running_progs = thejob->num_progs;
1385 thejob->stopped_progs = 0;
1386 thejob->text = xmalloc(BUFSIZ); /* cmdedit buffer size */
1387
1388 /*if (pi->progs[0] && pi->progs[0].argv && pi->progs[0].argv[0]) */
1389 {
1390 char *bar=thejob->text;
1391 char **foo=pi->progs[0].argv;
1392 while(foo && *foo) {
1393 bar += sprintf(bar, "%s ", *foo++);
1394 }
1395 }
1396
1397 /* we don't wait for background thejobs to return -- append it
1398 to the list of backgrounded thejobs and leave it alone */
1399 printf("[%d] %d\n", thejob->jobid, thejob->progs[0].pid);
1400 last_bg_pid = thejob->progs[0].pid;
1401 last_jobid = thejob->jobid;
1402}
1403
1404/* remove a backgrounded job */
1405static void remove_bg_job(struct pipe *pi)
1406{
1407 struct pipe *prev_pipe;
1408
1409 if (pi == job_list) {
1410 job_list = pi->next;
1411 } else {
1412 prev_pipe = job_list;
1413 while (prev_pipe->next != pi)
1414 prev_pipe = prev_pipe->next;
1415 prev_pipe->next = pi->next;
1416 }
1417 if (job_list)
1418 last_jobid = job_list->jobid;
1419 else
1420 last_jobid = 0;
1421
1422 pi->stopped_progs = 0;
1423 free_pipe(pi, 0);
1424 free(pi);
1425}
1426
1427/* Checks to see if any processes have exited -- if they
1428 have, figure out why and see if a job has completed */
1429static int checkjobs(struct pipe* fg_pipe)
1430{
1431 int attributes;
1432 int status;
1433 int prognum = 0;
1434 struct pipe *pi;
1435 pid_t childpid;
1436
1437 attributes = WUNTRACED;
1438 if (fg_pipe==NULL) {
1439 attributes |= WNOHANG;
1440 }
1441
1442 while ((childpid = waitpid(-1, &status, attributes)) > 0) {
1443 if (fg_pipe) {
1444 int i, rcode = 0;
1445 for (i=0; i < fg_pipe->num_progs; i++) {
1446 if (fg_pipe->progs[i].pid == childpid) {
1447 if (i==fg_pipe->num_progs-1)
1448 rcode=WEXITSTATUS(status);
1449 (fg_pipe->num_progs)--;
1450 return(rcode);
1451 }
1452 }
1453 }
1454
1455 for (pi = job_list; pi; pi = pi->next) {
1456 prognum = 0;
1457 while (prognum < pi->num_progs && pi->progs[prognum].pid != childpid) {
1458 prognum++;
1459 }
1460 if (prognum < pi->num_progs)
1461 break;
1462 }
1463
1464 if(pi==NULL) {
1465 debug_printf("checkjobs: pid %d was not in our list!\n", childpid);
1466 continue;
1467 }
1468
1469 if (WIFEXITED(status) || WIFSIGNALED(status)) {
1470 /* child exited */
1471 pi->running_progs--;
1472 pi->progs[prognum].pid = 0;
1473
1474 if (!pi->running_progs) {
1475 printf(JOB_STATUS_FORMAT, pi->jobid, "Done", pi->text);
1476 remove_bg_job(pi);
1477 }
1478 } else {
1479 /* child stopped */
1480 pi->stopped_progs++;
1481 pi->progs[prognum].is_stopped = 1;
1482
1483#if 0
1484 /* Printing this stuff is a pain, since it tends to
1485 * overwrite the prompt an inconveinient moments. So
1486 * don't do that. */
1487 if (pi->stopped_progs == pi->num_progs) {
1488 printf("\n"JOB_STATUS_FORMAT, pi->jobid, "Stopped", pi->text);
1489 }
1490#endif
1491 }
1492 }
1493
1494 if (childpid == -1 && errno != ECHILD)
1495 perror_msg("waitpid");
1496
1497 /* move the shell to the foreground */
1498 /*if (interactive && tcsetpgrp(shell_terminal, getpgid(0))) */
1499 /* perror_msg("tcsetpgrp-2"); */
1500 return -1;
1501}
1502
1503/* Figure out our controlling tty, checking in order stderr,
1504 * stdin, and stdout. If check_pgrp is set, also check that
1505 * we belong to the foreground process group associated with
1506 * that tty. The value of shell_terminal is needed in order to call
1507 * tcsetpgrp(shell_terminal, ...); */
1508void controlling_tty(int check_pgrp)
1509{
1510 pid_t curpgrp;
1511
1512 if ((curpgrp = tcgetpgrp(shell_terminal = 2)) < 0
1513 && (curpgrp = tcgetpgrp(shell_terminal = 0)) < 0
1514 && (curpgrp = tcgetpgrp(shell_terminal = 1)) < 0)
1515 goto shell_terminal_error;
1516
1517 if (check_pgrp && curpgrp != getpgid(0))
1518 goto shell_terminal_error;
1519
1520 return;
1521
1522shell_terminal_error:
1523 shell_terminal = -1;
1524 return;
1525}
1526#endif
1527
1528/* run_pipe_real() starts all the jobs, but doesn't wait for anything
1529 * to finish. See checkjobs().
1530 *
1531 * return code is normally -1, when the caller has to wait for children
1532 * to finish to determine the exit status of the pipe. If the pipe
1533 * is a simple builtin command, however, the action is done by the
1534 * time run_pipe_real returns, and the exit code is provided as the
1535 * return value.
1536 *
1537 * The input of the pipe is always stdin, the output is always
1538 * stdout. The outpipe[] mechanism in BusyBox-0.48 lash is bogus,
1539 * because it tries to avoid running the command substitution in
1540 * subshell, when that is in fact necessary. The subshell process
1541 * now has its stdout directed to the input of the appropriate pipe,
1542 * so this routine is noticeably simpler.
1543 */
1544static int run_pipe_real(struct pipe *pi)
1545{
1546 int i;
1547#ifndef __U_BOOT__
1548 int nextin, nextout;
1549 int pipefds[2]; /* pipefds[0] is for reading */
1550 struct child_prog *child;
1551 struct built_in_command *x;
1552 char *p;
d0fb80c3
WD		 1553# if __GNUC__
1554 /* Avoid longjmp clobbering */
1555 (void) &i;
1556 (void) &nextin;
1557 (void) &nextout;
1558 (void) &child;
1559# endif
fe8c2806
WD		 1560#else
1561 int nextin;
1562 int flag = do_repeat ? CMD_FLAG_REPEAT : 0;
1563 struct child_prog *child;
1564 cmd_tbl_t *cmdtp;
1565 char *p;
d0fb80c3
WD		 1566# if __GNUC__
1567 /* Avoid longjmp clobbering */
1568 (void) &i;
1569 (void) &nextin;
1570 (void) &child;
1571# endif
1572#endif /* __U_BOOT__ */
fe8c2806
WD		 1573
1574 nextin = 0;
1575#ifndef __U_BOOT__
1576 pi->pgrp = -1;
1577#endif
1578
1579 /* Check if this is a simple builtin (not part of a pipe).
1580 * Builtins within pipes have to fork anyway, and are handled in
1581 * pseudo_exec. "echo foo | read bar" doesn't work on bash, either.
1582 */
1583 if (pi->num_progs == 1) child = & (pi->progs[0]);
1584#ifndef __U_BOOT__
1585 if (pi->num_progs == 1 && child->group && child->subshell == 0) {
1586 int squirrel[] = {-1, -1, -1};
1587 int rcode;
1588 debug_printf("non-subshell grouping\n");
1589 setup_redirects(child, squirrel);
1590 /* XXX could we merge code with following builtin case,
1591 * by creating a pseudo builtin that calls run_list_real? */
1592 rcode = run_list_real(child->group);
1593 restore_redirects(squirrel);
1594#else
1595 if (pi->num_progs == 1 && child->group) {
1596 int rcode;
1597 debug_printf("non-subshell grouping\n");
1598 rcode = run_list_real(child->group);
1599#endif
1600 return rcode;
1601 } else if (pi->num_progs == 1 && pi->progs[0].argv != NULL) {
1602 for (i=0; is_assignment(child->argv[i]); i++) { /* nothing */ }
1603 if (i!=0 && child->argv[i]==NULL) {
1604 /* assignments, but no command: set the local environment */
1605 for (i=0; child->argv[i]!=NULL; i++) {
1606
1607 /* Ok, this case is tricky. We have to decide if this is a
1608 * local variable, or an already exported variable. If it is
1609 * already exported, we have to export the new value. If it is
1610 * not exported, we need only set this as a local variable.
1611 * This junk is all to decide whether or not to export this
1612 * variable. */
1613 int export_me=0;
1614 char *name, *value;
1615 name = xstrdup(child->argv[i]);
1616 debug_printf("Local environment set: %s\n", name);
1617 value = strchr(name, '=');
1618 if (value)
1619 *value=0;
1620#ifndef __U_BOOT__
1621 if ( get_local_var(name)) {
1622 export_me=1;
1623 }
1624#endif
1625 free(name);
1626 p = insert_var_value(child->argv[i]);
1627 set_local_var(p, export_me);
1628 if (p != child->argv[i]) free(p);
1629 }
1630 return EXIT_SUCCESS; /* don't worry about errors in set_local_var() yet */
1631 }
1632 for (i = 0; is_assignment(child->argv[i]); i++) {
1633 p = insert_var_value(child->argv[i]);
1634#ifndef __U_BOOT__
1635 putenv(strdup(p));
1636#else
1637 set_local_var(p, 0);
1638#endif
1639 if (p != child->argv[i]) {
1640 child->sp--;
1641 free(p);
1642 }
1643 }
1644 if (child->sp) {
1645 char * str = NULL;
1646
1647 str = make_string((child->argv + i));
1648 parse_string_outer(str, FLAG_EXIT_FROM_LOOP | FLAG_REPARSING);
1649 free(str);
1650 return last_return_code;
1651 }
1652#ifndef __U_BOOT__
1653 for (x = bltins; x->cmd; x++) {
1654 if (strcmp(child->argv[i], x->cmd) == 0 ) {
1655 int squirrel[] = {-1, -1, -1};
1656 int rcode;
1657 if (x->function == builtin_exec && child->argv[i+1]==NULL) {
1658 debug_printf("magic exec\n");
1659 setup_redirects(child,NULL);
1660 return EXIT_SUCCESS;
1661 }
1662 debug_printf("builtin inline %s\n", child->argv[0]);
1663 /* XXX setup_redirects acts on file descriptors, not FILEs.
1664 * This is perfect for work that comes after exec().
1665 * Is it really safe for inline use? Experimentally,
1666 * things seem to work with glibc. */
1667 setup_redirects(child, squirrel);
1668#else
1669 /* check ";", because ,example , argv consist from
1670 * "help;flinfo" must not execute
1671 */
1672 if (strchr(child->argv[i], ';')) {
1673 printf ("Unknown command '%s' - try 'help' or use 'run' command\n",
1674 child->argv[i]);
1675 return -1;
1676 }
8bde7f77
WD		 1677 /* Look up command in command table */
1678
1679
fe8c2806
WD		 1680 if ((cmdtp = find_cmd(child->argv[i])) == NULL) {
1681 printf ("Unknown command '%s' - try 'help'\n", child->argv[i]);
1682 return -1; /* give up after bad command */
1683 } else {
1684 int rcode;
1685#if (CONFIG_COMMANDS & CFG_CMD_BOOTD)
8bde7f77
WD		 1686 extern int do_bootd (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]);
1687
1688 /* avoid "bootd" recursion */
fe8c2806
WD		 1689 if (cmdtp->cmd == do_bootd) {
1690 if (flag & CMD_FLAG_BOOTD) {
1691 printf ("'bootd' recursion detected\n");
1692 return -1;
1693 }
1694 else
1695 flag |= CMD_FLAG_BOOTD;
1696 }
1697#endif /* CFG_CMD_BOOTD */
8bde7f77 1698 /* found - check max args */
fe8c2806
WD		 1699 if ((child->argc - i) > cmdtp->maxargs) {
1700 printf ("Usage:\n%s\n", cmdtp->usage);
1701 return -1;
1702 }
1703#endif
1704 child->argv+=i; /* XXX horrible hack */
1705#ifndef __U_BOOT__
1706 rcode = x->function(child);
1707#else
1708 /* OK - call function to do the command */
8bde7f77 1709
fe8c2806 1710 rcode = (cmdtp->cmd)
8bde7f77 1711(cmdtp, flag,child->argc-i,&child->argv[i]);
fe8c2806
WD		 1712 if ( !cmdtp->repeatable )
1713 flag_repeat = 0;
8bde7f77
WD		 1714
1715
fe8c2806
WD		 1716#endif
1717 child->argv-=i; /* XXX restore hack so free() can work right */
1718#ifndef __U_BOOT__
8bde7f77 1719
fe8c2806
WD		 1720 restore_redirects(squirrel);
1721#endif
8bde7f77 1722
fe8c2806
WD		 1723 return rcode;
1724 }
1725 }
1726#ifndef __U_BOOT__
1727 }
1728
1729 for (i = 0; i < pi->num_progs; i++) {
1730 child = & (pi->progs[i]);
1731
1732 /* pipes are inserted between pairs of commands */
1733 if ((i + 1) < pi->num_progs) {
1734 if (pipe(pipefds)<0) perror_msg_and_die("pipe");
1735 nextout = pipefds[1];
1736 } else {
1737 nextout=1;
1738 pipefds[0] = -1;
1739 }
1740
1741 /* XXX test for failed fork()? */
1742 if (!(child->pid = fork())) {
1743 /* Set the handling for job control signals back to the default. */
1744 signal(SIGINT, SIG_DFL);
1745 signal(SIGQUIT, SIG_DFL);
1746 signal(SIGTERM, SIG_DFL);
1747 signal(SIGTSTP, SIG_DFL);
1748 signal(SIGTTIN, SIG_DFL);
1749 signal(SIGTTOU, SIG_DFL);
1750 signal(SIGCHLD, SIG_DFL);
1751
1752 close_all();
1753
1754 if (nextin != 0) {
1755 dup2(nextin, 0);
1756 close(nextin);
1757 }
1758 if (nextout != 1) {
1759 dup2(nextout, 1);
1760 close(nextout);
1761 }
1762 if (pipefds[0]!=-1) {
1763 close(pipefds[0]); /* opposite end of our output pipe */
1764 }
1765
1766 /* Like bash, explicit redirects override pipes,
1767 * and the pipe fd is available for dup'ing. */
1768 setup_redirects(child,NULL);
1769
1770 if (interactive && pi->followup!=PIPE_BG) {
1771 /* If we (the child) win the race, put ourselves in the process
1772 * group whose leader is the first process in this pipe. */
1773 if (pi->pgrp < 0) {
1774 pi->pgrp = getpid();
1775 }
1776 if (setpgid(0, pi->pgrp) == 0) {
1777 tcsetpgrp(2, pi->pgrp);
1778 }
1779 }
1780
1781 pseudo_exec(child);
1782 }
1783
1784
1785 /* put our child in the process group whose leader is the
1786 first process in this pipe */
1787 if (pi->pgrp < 0) {
1788 pi->pgrp = child->pid;
1789 }
1790 /* Don't check for errors. The child may be dead already,
1791 * in which case setpgid returns error code EACCES. */
1792 setpgid(child->pid, pi->pgrp);
1793
1794 if (nextin != 0)
1795 close(nextin);
1796 if (nextout != 1)
1797 close(nextout);
1798
1799 /* If there isn't another process, nextin is garbage
1800 but it doesn't matter */
1801 nextin = pipefds[0];
1802 }
1803#endif
1804 return -1;
1805}
1806
1807static int run_list_real(struct pipe *pi)
1808{
1809 char *save_name = NULL;
1810 char **list = NULL;
1811 char **save_list = NULL;
1812 struct pipe *rpipe;
1813 int flag_rep = 0;
1814#ifndef __U_BOOT__
1815 int save_num_progs;
1816#endif
1817 int rcode=0, flag_skip=1;
1818 int flag_restore = 0;
1819 int if_code=0, next_if_code=0; /* need double-buffer to handle elif */
1820 reserved_style rmode, skip_more_in_this_rmode=RES_XXXX;
1821 /* check syntax for "for" */
1822 for (rpipe = pi; rpipe; rpipe = rpipe->next) {
1823 if ((rpipe->r_mode == RES_IN ||
1824 rpipe->r_mode == RES_FOR) &&
1825 (rpipe->next == NULL)) {
1826 syntax();
1827#ifdef __U_BOOT__
1828 flag_repeat = 0;
1829#endif
1830 return 1;
1831 }
1832 if ((rpipe->r_mode == RES_IN &&
1833 (rpipe->next->r_mode == RES_IN &&
1834 rpipe->next->progs->argv != NULL))||
1835 (rpipe->r_mode == RES_FOR &&
1836 rpipe->next->r_mode != RES_IN)) {
1837 syntax();
1838#ifdef __U_BOOT__
1839 flag_repeat = 0;
1840#endif
1841 return 1;
1842 }
1843 }
1844 for (; pi; pi = (flag_restore != 0) ? rpipe : pi->next) {
1845 if (pi->r_mode == RES_WHILE || pi->r_mode == RES_UNTIL ||
1846 pi->r_mode == RES_FOR) {
1847#ifdef __U_BOOT__
1848 /* check Ctrl-C */
1849 ctrlc();
1850 if ((had_ctrlc())) {
1851 return 1;
1852 }
1853#endif
1854 flag_restore = 0;
1855 if (!rpipe) {
1856 flag_rep = 0;
1857 rpipe = pi;
1858 }
1859 }
1860 rmode = pi->r_mode;
1861 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);
1862 if (rmode == skip_more_in_this_rmode && flag_skip) {
1863 if (pi->followup == PIPE_SEQ) flag_skip=0;
1864 continue;
1865 }
1866 flag_skip = 1;
1867 skip_more_in_this_rmode = RES_XXXX;
1868 if (rmode == RES_THEN || rmode == RES_ELSE) if_code = next_if_code;
1869 if (rmode == RES_THEN && if_code) continue;
1870 if (rmode == RES_ELSE && !if_code) continue;
56b86bf0 1871 if (rmode == RES_ELIF && !if_code) break;
fe8c2806
WD		 1872 if (rmode == RES_FOR && pi->num_progs) {
1873 if (!list) {
1874 /* if no variable values after "in" we skip "for" */
1875 if (!pi->next->progs->argv) continue;
1876 /* create list of variable values */
1877 list = make_list_in(pi->next->progs->argv,
1878 pi->progs->argv[0]);
1879 save_list = list;
1880 save_name = pi->progs->argv[0];
1881 pi->progs->argv[0] = NULL;
1882 flag_rep = 1;
1883 }
1884 if (!(*list)) {
1885 free(pi->progs->argv[0]);
1886 free(save_list);
1887 list = NULL;
1888 flag_rep = 0;
1889 pi->progs->argv[0] = save_name;
1890#ifndef __U_BOOT__
1891 pi->progs->glob_result.gl_pathv[0] =
1892 pi->progs->argv[0];
1893#endif
1894 continue;
1895 } else {
1896 /* insert new value from list for variable */
1897 if (pi->progs->argv[0])
1898 free(pi->progs->argv[0]);
1899 pi->progs->argv[0] = *list++;
1900#ifndef __U_BOOT__
1901 pi->progs->glob_result.gl_pathv[0] =
1902 pi->progs->argv[0];
1903#endif
1904 }
1905 }
1906 if (rmode == RES_IN) continue;
1907 if (rmode == RES_DO) {
1908 if (!flag_rep) continue;
1909 }
1910 if ((rmode == RES_DONE)) {
1911 if (flag_rep) {
1912 flag_restore = 1;
1913 } else {
1914 rpipe = NULL;
1915 }
1916 }
1917 if (pi->num_progs == 0) continue;
1918#ifndef __U_BOOT__
1919 save_num_progs = pi->num_progs; /* save number of programs */
1920#endif
1921 rcode = run_pipe_real(pi);
1922 debug_printf("run_pipe_real returned %d\n",rcode);
1923#ifndef __U_BOOT__
1924 if (rcode!=-1) {
1925 /* We only ran a builtin: rcode was set by the return value
1926 * of run_pipe_real(), and we don't need to wait for anything. */
1927 } else if (pi->followup==PIPE_BG) {
1928 /* XXX check bash's behavior with nontrivial pipes */
1929 /* XXX compute jobid */
1930 /* XXX what does bash do with attempts to background builtins? */
1931 insert_bg_job(pi);
1932 rcode = EXIT_SUCCESS;
1933 } else {
1934 if (interactive) {
1935 /* move the new process group into the foreground */
1936 if (tcsetpgrp(shell_terminal, pi->pgrp) && errno != ENOTTY)
1937 perror_msg("tcsetpgrp-3");
1938 rcode = checkjobs(pi);
1939 /* move the shell to the foreground */
1940 if (tcsetpgrp(shell_terminal, getpgid(0)) && errno != ENOTTY)
1941 perror_msg("tcsetpgrp-4");
1942 } else {
1943 rcode = checkjobs(pi);
1944 }
1945 debug_printf("checkjobs returned %d\n",rcode);
1946 }
1947 last_return_code=rcode;
1948#else
c26e454d
WD		 1949 if (rcode < -1) {
1950 last_return_code = -rcode - 2;
1951 return -2; /* exit */
1952 }
fe8c2806
WD		 1953 last_return_code=(rcode == 0) ? 0 : 1;
1954#endif
1955#ifndef __U_BOOT__
1956 pi->num_progs = save_num_progs; /* restore number of programs */
1957#endif
1958 if ( rmode == RES_IF || rmode == RES_ELIF )
1959 next_if_code=rcode; /* can be overwritten a number of times */
1960 if (rmode == RES_WHILE)
1961 flag_rep = !last_return_code;
1962 if (rmode == RES_UNTIL)
1963 flag_rep = last_return_code;
1964 if ( (rcode==EXIT_SUCCESS && pi->followup==PIPE_OR) ||
1965 (rcode!=EXIT_SUCCESS && pi->followup==PIPE_AND) )
1966 skip_more_in_this_rmode=rmode;
1967#ifndef __U_BOOT__
1968 checkjobs(NULL);
1969#endif
1970 }
1971 return rcode;
1972}
1973
1974/* broken, of course, but OK for testing */
1975static char *indenter(int i)
1976{
1977 static char blanks[]=" ";
1978 return &blanks[sizeof(blanks)-i-1];
1979}
1980
1981/* return code is the exit status of the pipe */
1982static int free_pipe(struct pipe *pi, int indent)
1983{
1984 char **p;
1985 struct child_prog *child;
1986#ifndef __U_BOOT__
1987 struct redir_struct *r, *rnext;
1988#endif
1989 int a, i, ret_code=0;
1990 char *ind = indenter(indent);
1991
1992#ifndef __U_BOOT__
1993 if (pi->stopped_progs > 0)
1994 return ret_code;
1995 final_printf("%s run pipe: (pid %d)\n",ind,getpid());
1996#endif
1997 for (i=0; i<pi->num_progs; i++) {
1998 child = &pi->progs[i];
1999 final_printf("%s command %d:\n",ind,i);
2000 if (child->argv) {
2001 for (a=0,p=child->argv; *p; a++,p++) {
2002 final_printf("%s argv[%d] = %s\n",ind,a,*p);
2003 }
2004#ifndef __U_BOOT__
2005 globfree(&child->glob_result);
2006#else
8bde7f77
WD		 2007 for (a = child->argc;a >= 0;a--) {
2008 free(child->argv[a]);
2009 }
fe8c2806 2010 free(child->argv);
8bde7f77 2011 child->argc = 0;
fe8c2806
WD		 2012#endif
2013 child->argv=NULL;
2014 } else if (child->group) {
2015#ifndef __U_BOOT__
2016 final_printf("%s begin group (subshell:%d)\n",ind, child->subshell);
2017#endif
2018 ret_code = free_pipe_list(child->group,indent+3);
2019 final_printf("%s end group\n",ind);
2020 } else {
2021 final_printf("%s (nil)\n",ind);
2022 }
2023#ifndef __U_BOOT__
2024 for (r=child->redirects; r; r=rnext) {
2025 final_printf("%s redirect %d%s", ind, r->fd, redir_table[r->type].descrip);
2026 if (r->dup == -1) {
2027 /* guard against the case >$FOO, where foo is unset or blank */
2028 if (r->word.gl_pathv) {
2029 final_printf(" %s\n", *r->word.gl_pathv);
2030 globfree(&r->word);
2031 }
2032 } else {
2033 final_printf("&%d\n", r->dup);
2034 }
2035 rnext=r->next;
2036 free(r);
2037 }
2038 child->redirects=NULL;
2039#endif
2040 }
2041 free(pi->progs); /* children are an array, they get freed all at once */
2042 pi->progs=NULL;
2043 return ret_code;
2044}
2045
2046static int free_pipe_list(struct pipe *head, int indent)
2047{
2048 int rcode=0; /* if list has no members */
2049 struct pipe *pi, *next;
2050 char *ind = indenter(indent);
2051 for (pi=head; pi; pi=next) {
2052 final_printf("%s pipe reserved mode %d\n", ind, pi->r_mode);
2053 rcode = free_pipe(pi, indent);
2054 final_printf("%s pipe followup code %d\n", ind, pi->followup);
2055 next=pi->next;
2056 pi->next=NULL;
2057 free(pi);
2058 }
2059 return rcode;
2060}
2061
2062/* Select which version we will use */
2063static int run_list(struct pipe *pi)
2064{
2065 int rcode=0;
2066#ifndef __U_BOOT__
2067 if (fake_mode==0) {
2068#endif
2069 rcode = run_list_real(pi);
2070#ifndef __U_BOOT__
2071 }
2072#endif
2073 /* free_pipe_list has the side effect of clearing memory
2074 * In the long run that function can be merged with run_list_real,
2075 * but doing that now would hobble the debugging effort. */
2076 free_pipe_list(pi,0);
2077 return rcode;
2078}
2079
2080/* The API for glob is arguably broken. This routine pushes a non-matching
2081 * string into the output structure, removing non-backslashed backslashes.
2082 * If someone can prove me wrong, by performing this function within the
2083 * original glob(3) api, feel free to rewrite this routine into oblivion.
2084 * Return code (0 vs. GLOB_NOSPACE) matches glob(3).
2085 * XXX broken if the last character is '\\', check that before calling.
2086 */
2087#ifndef __U_BOOT__
2088static int globhack(const char *src, int flags, glob_t *pglob)
2089{
2090 int cnt=0, pathc;
2091 const char *s;
2092 char *dest;
2093 for (cnt=1, s=src; s && *s; s++) {
2094 if (*s == '\\') s++;
2095 cnt++;
2096 }
2097 dest = malloc(cnt);
2098 if (!dest) return GLOB_NOSPACE;
2099 if (!(flags & GLOB_APPEND)) {
2100 pglob->gl_pathv=NULL;
2101 pglob->gl_pathc=0;
2102 pglob->gl_offs=0;
2103 pglob->gl_offs=0;
2104 }
2105 pathc = ++pglob->gl_pathc;
2106 pglob->gl_pathv = realloc(pglob->gl_pathv, (pathc+1)*sizeof(*pglob->gl_pathv));
2107 if (pglob->gl_pathv == NULL) return GLOB_NOSPACE;
2108 pglob->gl_pathv[pathc-1]=dest;
2109 pglob->gl_pathv[pathc]=NULL;
2110 for (s=src; s && *s; s++, dest++) {
2111 if (*s == '\\') s++;
2112 *dest = *s;
2113 }
2114 *dest='\0';
2115 return 0;
2116}
2117
2118/* XXX broken if the last character is '\\', check that before calling */
2119static int glob_needed(const char *s)
2120{
2121 for (; *s; s++) {
2122 if (*s == '\\') s++;
2123 if (strchr("*[?",*s)) return 1;
2124 }
2125 return 0;
2126}
2127
2128#if 0
2129static void globprint(glob_t *pglob)
2130{
2131 int i;
2132 debug_printf("glob_t at %p:\n", pglob);
2133 debug_printf(" gl_pathc=%d gl_pathv=%p gl_offs=%d gl_flags=%d\n",
2134 pglob->gl_pathc, pglob->gl_pathv, pglob->gl_offs, pglob->gl_flags);
2135 for (i=0; i<pglob->gl_pathc; i++)
2136 debug_printf("pglob->gl_pathv[%d] = %p = %s\n", i,
2137 pglob->gl_pathv[i], pglob->gl_pathv[i]);
2138}
2139#endif
2140
2141static int xglob(o_string *dest, int flags, glob_t *pglob)
2142{
2143 int gr;
2144
8bde7f77 2145 /* short-circuit for null word */
fe8c2806 2146 /* we can code this better when the debug_printf's are gone */
8bde7f77
WD		 2147 if (dest->length == 0) {
2148 if (dest->nonnull) {
2149 /* bash man page calls this an "explicit" null */
2150 gr = globhack(dest->data, flags, pglob);
2151 debug_printf("globhack returned %d\n",gr);
2152 } else {
fe8c2806
WD		 2153 return 0;
2154 }
8bde7f77 2155 } else if (glob_needed(dest->data)) {
fe8c2806
WD		 2156 gr = glob(dest->data, flags, NULL, pglob);
2157 debug_printf("glob returned %d\n",gr);
2158 if (gr == GLOB_NOMATCH) {
2159 /* quote removal, or more accurately, backslash removal */
2160 gr = globhack(dest->data, flags, pglob);
2161 debug_printf("globhack returned %d\n",gr);
2162 }
2163 } else {
2164 gr = globhack(dest->data, flags, pglob);
2165 debug_printf("globhack returned %d\n",gr);
2166 }
2167 if (gr == GLOB_NOSPACE)
2168 error_msg_and_die("out of memory during glob");
2169 if (gr != 0) { /* GLOB_ABORTED ? */
2170 error_msg("glob(3) error %d",gr);
2171 }
2172 /* globprint(glob_target); */
2173 return gr;
2174}
2175#endif
2176
c26e454d
WD		 2177#ifdef __U_BOOT__
2178static char *get_dollar_var(char ch);
2179#endif
2180
fe8c2806
WD		 2181/* This is used to get/check local shell variables */
2182static char *get_local_var(const char *s)
2183{
2184 struct variables *cur;
2185
2186 if (!s)
2187 return NULL;
c26e454d
WD		 2188
2189#ifdef __U_BOOT__
2190 if (*s == '$')
2191 return get_dollar_var(s[1]);
2192#endif
2193
fe8c2806
WD		 2194 for (cur = top_vars; cur; cur=cur->next)
2195 if(strcmp(cur->name, s)==0)
2196 return cur->value;
2197 return NULL;
2198}
2199
2200/* This is used to set local shell variables
2201 flg_export==0 if only local (not exporting) variable
2202 flg_export==1 if "new" exporting environ
2203 flg_export>1 if current startup environ (not call putenv()) */
2204static int set_local_var(const char *s, int flg_export)
2205{
2206 char *name, *value;
2207 int result=0;
2208 struct variables *cur;
2209
c26e454d
WD		 2210#ifdef __U_BOOT__
2211 /* might be possible! */
2212 if (!isalpha(*s))
2213 return -1;
2214#endif
2215
fe8c2806
WD		 2216 name=strdup(s);
2217
2218#ifdef __U_BOOT__
2219 if (getenv(name) != NULL) {
2220 printf ("ERROR: "
2d1a537d 2221 "There is a global environment variable with the same name.\n");
c26e454d 2222 free(name);
fe8c2806
WD		 2223 return -1;
2224 }
2225#endif
2226 /* Assume when we enter this function that we are already in
2227 * NAME=VALUE format. So the first order of business is to
2228 * split 's' on the '=' into 'name' and 'value' */
2229 value = strchr(name, '=');
2230 if (value==0 && ++value==0) {
2231 free(name);
2232 return -1;
2233 }
2234 *value++ = 0;
2235
2236 for(cur = top_vars; cur; cur = cur->next) {
2237 if(strcmp(cur->name, name)==0)
2238 break;
2239 }
2240
2241 if(cur) {
2242 if(strcmp(cur->value, value)==0) {
2243 if(flg_export>0 && cur->flg_export==0)
2244 cur->flg_export=flg_export;
2245 else
2246 result++;
2247 } else {
2248 if(cur->flg_read_only) {
2249 error_msg("%s: readonly variable", name);
2250 result = -1;
2251 } else {
2252 if(flg_export>0 || cur->flg_export>1)
2253 cur->flg_export=1;
2254 free(cur->value);
2255
2256 cur->value = strdup(value);
2257 }
2258 }
2259 } else {
2260 cur = malloc(sizeof(struct variables));
2261 if(!cur) {
2262 result = -1;
2263 } else {
2264 cur->name = strdup(name);
2265 if(cur->name == 0) {
2266 free(cur);
2267 result = -1;
2268 } else {
2269 struct variables *bottom = top_vars;
2270 cur->value = strdup(value);
2271 cur->next = 0;
2272 cur->flg_export = flg_export;
2273 cur->flg_read_only = 0;
2274 while(bottom->next) bottom=bottom->next;
2275 bottom->next = cur;
2276 }
2277 }
2278 }
2279
2280#ifndef __U_BOOT__
2281 if(result==0 && cur->flg_export==1) {
2282 *(value-1) = '=';
2283 result = putenv(name);
2284 } else {
2285#endif
2286 free(name);
2287#ifndef __U_BOOT__
2288 if(result>0) /* equivalent to previous set */
2289 result = 0;
2290 }
2291#endif
2292 return result;
2293}
2294
2295#ifndef __U_BOOT__
2296static void unset_local_var(const char *name)
2297{
2298 struct variables *cur;
2299
2300 if (name) {
2301 for (cur = top_vars; cur; cur=cur->next) {
2302 if(strcmp(cur->name, name)==0)
2303 break;
2304 }
2305 if(cur!=0) {
2306 struct variables *next = top_vars;
2307 if(cur->flg_read_only) {
2308 error_msg("%s: readonly variable", name);
2309 return;
2310 } else {
2311 if(cur->flg_export)
2312 unsetenv(cur->name);
2313 free(cur->name);
2314 free(cur->value);
2315 while (next->next != cur)
2316 next = next->next;
2317 next->next = cur->next;
2318 }
2319 free(cur);
2320 }
2321 }
2322}
2323#endif
2324
2325static int is_assignment(const char *s)
2326{
c26e454d
WD		 2327 if (s == NULL)
2328 return 0;
2329
2330 if (!isalpha(*s)) return 0;
fe8c2806
WD		 2331 ++s;
2332 while(isalnum(*s) || *s=='_') ++s;
2333 return *s=='=';
2334}
2335
2336#ifndef __U_BOOT__
2337/* the src parameter allows us to peek forward to a possible &n syntax
2338 * for file descriptor duplication, e.g., "2>&1".
2339 * Return code is 0 normally, 1 if a syntax error is detected in src.
2340 * Resource errors (in xmalloc) cause the process to exit */
2341static int setup_redirect(struct p_context *ctx, int fd, redir_type style,
2342 struct in_str *input)
2343{
2344 struct child_prog *child=ctx->child;
2345 struct redir_struct *redir = child->redirects;
2346 struct redir_struct *last_redir=NULL;
2347
2348 /* Create a new redir_struct and drop it onto the end of the linked list */
2349 while(redir) {
2350 last_redir=redir;
2351 redir=redir->next;
2352 }
2353 redir = xmalloc(sizeof(struct redir_struct));
2354 redir->next=NULL;
2355 redir->word.gl_pathv=NULL;
2356 if (last_redir) {
2357 last_redir->next=redir;
2358 } else {
2359 child->redirects=redir;
2360 }
2361
2362 redir->type=style;
2363 redir->fd= (fd==-1) ? redir_table[style].default_fd : fd ;
2364
2365 debug_printf("Redirect type %d%s\n", redir->fd, redir_table[style].descrip);
2366
2367 /* Check for a '2>&1' type redirect */
2368 redir->dup = redirect_dup_num(input);
2369 if (redir->dup == -2) return 1; /* syntax error */
2370 if (redir->dup != -1) {
2371 /* Erik had a check here that the file descriptor in question
2372 * is legit; I postpone that to "run time"
2373 * A "-" representation of "close me" shows up as a -3 here */
2374 debug_printf("Duplicating redirect '%d>&%d'\n", redir->fd, redir->dup);
2375 } else {
2376 /* We do _not_ try to open the file that src points to,
2377 * since we need to return and let src be expanded first.
2378 * Set ctx->pending_redirect, so we know what to do at the
2379 * end of the next parsed word.
2380 */
2381 ctx->pending_redirect = redir;
2382 }
2383 return 0;
2384}
2385#endif
2386
2387struct pipe *new_pipe(void) {
2388 struct pipe *pi;
2389 pi = xmalloc(sizeof(struct pipe));
2390 pi->num_progs = 0;
2391 pi->progs = NULL;
2392 pi->next = NULL;
2393 pi->followup = 0; /* invalid */
e98f68be 2394 pi->r_mode = RES_NONE;
fe8c2806
WD		 2395 return pi;
2396}
2397
2398static void initialize_context(struct p_context *ctx)
2399{
2400 ctx->pipe=NULL;
2401#ifndef __U_BOOT__
2402 ctx->pending_redirect=NULL;
2403#endif
2404 ctx->child=NULL;
2405 ctx->list_head=new_pipe();
2406 ctx->pipe=ctx->list_head;
2407 ctx->w=RES_NONE;
2408 ctx->stack=NULL;
2409#ifdef __U_BOOT__
2410 ctx->old_flag=0;
2411#endif
2412 done_command(ctx); /* creates the memory for working child */
2413}
2414
2415/* normal return is 0
2416 * if a reserved word is found, and processed, return 1
2417 * should handle if, then, elif, else, fi, for, while, until, do, done.
2418 * case, function, and select are obnoxious, save those for later.
2419 */
3e38691e
WD		 2420struct reserved_combo {
2421 char *literal;
2422 int code;
2423 long flag;
2424};
2425/* Mostly a list of accepted follow-up reserved words.
2426 * FLAG_END means we are done with the sequence, and are ready
2427 * to turn the compound list into a command.
2428 * FLAG_START means the word must start a new compound list.
2429 */
2430static struct reserved_combo reserved_list[] = {
2431 { "if", RES_IF, FLAG_THEN | FLAG_START },
2432 { "then", RES_THEN, FLAG_ELIF | FLAG_ELSE | FLAG_FI },
2433 { "elif", RES_ELIF, FLAG_THEN },
2434 { "else", RES_ELSE, FLAG_FI },
2435 { "fi", RES_FI, FLAG_END },
2436 { "for", RES_FOR, FLAG_IN | FLAG_START },
2437 { "while", RES_WHILE, FLAG_DO | FLAG_START },
2438 { "until", RES_UNTIL, FLAG_DO | FLAG_START },
2439 { "in", RES_IN, FLAG_DO },
2440 { "do", RES_DO, FLAG_DONE },
2441 { "done", RES_DONE, FLAG_END }
2442};
2443#define NRES (sizeof(reserved_list)/sizeof(struct reserved_combo))
2444
fe8c2806
WD		 2445int reserved_word(o_string *dest, struct p_context *ctx)
2446{
fe8c2806
WD		 2447 struct reserved_combo *r;
2448 for (r=reserved_list;
fe8c2806
WD		 2449 r<reserved_list+NRES; r++) {
2450 if (strcmp(dest->data, r->literal) == 0) {
2451 debug_printf("found reserved word %s, code %d\n",r->literal,r->code);
2452 if (r->flag & FLAG_START) {
2453 struct p_context *new = xmalloc(sizeof(struct p_context));
2454 debug_printf("push stack\n");
2455 if (ctx->w == RES_IN || ctx->w == RES_FOR) {
2456 syntax();
2457 free(new);
2458 ctx->w = RES_SNTX;
2459 b_reset(dest);
2460 return 1;
2461 }
2462 *new = *ctx; /* physical copy */
2463 initialize_context(ctx);
2464 ctx->stack=new;
2465 } else if ( ctx->w == RES_NONE || ! (ctx->old_flag & (1<<r->code))) {
2466 syntax();
2467 ctx->w = RES_SNTX;
2468 b_reset(dest);
2469 return 1;
2470 }
2471 ctx->w=r->code;
2472 ctx->old_flag = r->flag;
2473 if (ctx->old_flag & FLAG_END) {
2474 struct p_context *old;
2475 debug_printf("pop stack\n");
2476 done_pipe(ctx,PIPE_SEQ);
2477 old = ctx->stack;
2478 old->child->group = ctx->list_head;
2479#ifndef __U_BOOT__
2480 old->child->subshell = 0;
2481#endif
2482 *ctx = *old; /* physical copy */
2483 free(old);
2484 }
2485 b_reset (dest);
2486 return 1;
2487 }
2488 }
2489 return 0;
2490}
2491
2492/* normal return is 0.
2493 * Syntax or xglob errors return 1. */
2494static int done_word(o_string *dest, struct p_context *ctx)
2495{
2496 struct child_prog *child=ctx->child;
2497#ifndef __U_BOOT__
2498 glob_t *glob_target;
2499 int gr, flags = 0;
2500#else
2501 char *str, *s;
2502 int argc, cnt;
2503#endif
2504
2505 debug_printf("done_word: %s %p\n", dest->data, child);
2506 if (dest->length == 0 && !dest->nonnull) {
2507 debug_printf(" true null, ignored\n");
2508 return 0;
2509 }
2510#ifndef __U_BOOT__
2511 if (ctx->pending_redirect) {
2512 glob_target = &ctx->pending_redirect->word;
2513 } else {
2514#endif
2515 if (child->group) {
2516 syntax();
2517 return 1; /* syntax error, groups and arglists don't mix */
2518 }
2519 if (!child->argv && (ctx->type & FLAG_PARSE_SEMICOLON)) {
2520 debug_printf("checking %s for reserved-ness\n",dest->data);
2521 if (reserved_word(dest,ctx)) return ctx->w==RES_SNTX;
2522 }
2523#ifndef __U_BOOT__
2524 glob_target = &child->glob_result;
8bde7f77 2525 if (child->argv) flags |= GLOB_APPEND;
fe8c2806
WD		 2526#else
2527 for (cnt = 1, s = dest->data; s && *s; s++) {
2528 if (*s == '\\') s++;
2529 cnt++;
2530 }
2531 str = malloc(cnt);
2532 if (!str) return 1;
2533 if ( child->argv == NULL) {
2534 child->argc=0;
2535 }
2536 argc = ++child->argc;
2537 child->argv = realloc(child->argv, (argc+1)*sizeof(*child->argv));
2538 if (child->argv == NULL) return 1;
2539 child->argv[argc-1]=str;
2540 child->argv[argc]=NULL;
2541 for (s = dest->data; s && *s; s++,str++) {
2542 if (*s == '\\') s++;
2543 *str = *s;
2544 }
2545 *str = '\0';
2546#endif
2547#ifndef __U_BOOT__
2548 }
2549 gr = xglob(dest, flags, glob_target);
2550 if (gr != 0) return 1;
2551#endif
2552
2553 b_reset(dest);
2554#ifndef __U_BOOT__
2555 if (ctx->pending_redirect) {
2556 ctx->pending_redirect=NULL;
2557 if (glob_target->gl_pathc != 1) {
2558 error_msg("ambiguous redirect");
2559 return 1;
2560 }
2561 } else {
2562 child->argv = glob_target->gl_pathv;
2563 }
2564#endif
2565 if (ctx->w == RES_FOR) {
2566 done_word(dest,ctx);
2567 done_pipe(ctx,PIPE_SEQ);
2568 }
2569 return 0;
2570}
2571
2572/* The only possible error here is out of memory, in which case
2573 * xmalloc exits. */
2574static int done_command(struct p_context *ctx)
2575{
2576 /* The child is really already in the pipe structure, so
2577 * advance the pipe counter and make a new, null child.
2578 * Only real trickiness here is that the uncommitted
2579 * child structure, to which ctx->child points, is not
2580 * counted in pi->num_progs. */
2581 struct pipe *pi=ctx->pipe;
2582 struct child_prog *prog=ctx->child;
2583
2584 if (prog && prog->group == NULL
8bde7f77 2585 && prog->argv == NULL
fe8c2806 2586#ifndef __U_BOOT__
8bde7f77 2587 && prog->redirects == NULL) {
fe8c2806
WD		 2588#else
2589 ) {
2590#endif
2591 debug_printf("done_command: skipping null command\n");
2592 return 0;
2593 } else if (prog) {
2594 pi->num_progs++;
2595 debug_printf("done_command: num_progs incremented to %d\n",pi->num_progs);
2596 } else {
2597 debug_printf("done_command: initializing\n");
2598 }
2599 pi->progs = xrealloc(pi->progs, sizeof(*pi->progs) * (pi->num_progs+1));
2600
2601 prog = pi->progs + pi->num_progs;
2602#ifndef __U_BOOT__
2603 prog->redirects = NULL;
2604#endif
2605 prog->argv = NULL;
2606#ifndef __U_BOOT__
2607 prog->is_stopped = 0;
2608#endif
2609 prog->group = NULL;
2610#ifndef __U_BOOT__
2611 prog->glob_result.gl_pathv = NULL;
2612 prog->family = pi;
2613#endif
2614 prog->sp = 0;
2615 ctx->child = prog;
2616 prog->type = ctx->type;
2617
2618 /* but ctx->pipe and ctx->list_head remain unchanged */
2619 return 0;
2620}
2621
2622static int done_pipe(struct p_context *ctx, pipe_style type)
2623{
2624 struct pipe *new_p;
2625 done_command(ctx); /* implicit closure of previous command */
2626 debug_printf("done_pipe, type %d\n", type);
2627 ctx->pipe->followup = type;
2628 ctx->pipe->r_mode = ctx->w;
2629 new_p=new_pipe();
2630 ctx->pipe->next = new_p;
2631 ctx->pipe = new_p;
2632 ctx->child = NULL;
2633 done_command(ctx); /* set up new pipe to accept commands */
2634 return 0;
2635}
2636
2637#ifndef __U_BOOT__
2638/* peek ahead in the in_str to find out if we have a "&n" construct,
2639 * as in "2>&1", that represents duplicating a file descriptor.
2640 * returns either -2 (syntax error), -1 (no &), or the number found.
2641 */
2642static int redirect_dup_num(struct in_str *input)
2643{
2644 int ch, d=0, ok=0;
2645 ch = b_peek(input);
2646 if (ch != '&') return -1;
2647
2648 b_getch(input); /* get the & */
2649 ch=b_peek(input);
2650 if (ch == '-') {
2651 b_getch(input);
2652 return -3; /* "-" represents "close me" */
2653 }
2654 while (isdigit(ch)) {
2655 d = d*10+(ch-'0');
2656 ok=1;
2657 b_getch(input);
2658 ch = b_peek(input);
2659 }
2660 if (ok) return d;
2661
2662 error_msg("ambiguous redirect");
2663 return -2;
2664}
2665
2666/* If a redirect is immediately preceded by a number, that number is
2667 * supposed to tell which file descriptor to redirect. This routine
2668 * looks for such preceding numbers. In an ideal world this routine
2669 * needs to handle all the following classes of redirects...
2670 * echo 2>foo # redirects fd 2 to file "foo", nothing passed to echo
2671 * echo 49>foo # redirects fd 49 to file "foo", nothing passed to echo
2672 * echo -2>foo # redirects fd 1 to file "foo", "-2" passed to echo
2673 * echo 49x>foo # redirects fd 1 to file "foo", "49x" passed to echo
2674 * A -1 output from this program means no valid number was found, so the
2675 * caller should use the appropriate default for this redirection.
2676 */
2677static int redirect_opt_num(o_string *o)
2678{
2679 int num;
2680
2681 if (o->length==0) return -1;
2682 for(num=0; num<o->length; num++) {
2683 if (!isdigit(*(o->data+num))) {
2684 return -1;
2685 }
2686 }
2687 /* reuse num (and save an int) */
2688 num=atoi(o->data);
2689 b_reset(o);
2690 return num;
2691}
2692
2693FILE *generate_stream_from_list(struct pipe *head)
2694{
2695 FILE *pf;
2696#if 1
2697 int pid, channel[2];
2698 if (pipe(channel)<0) perror_msg_and_die("pipe");
2699 pid=fork();
2700 if (pid<0) {
2701 perror_msg_and_die("fork");
2702 } else if (pid==0) {
2703 close(channel[0]);
2704 if (channel[1] != 1) {
2705 dup2(channel[1],1);
2706 close(channel[1]);
2707 }
2708#if 0
2709#define SURROGATE "surrogate response"
2710 write(1,SURROGATE,sizeof(SURROGATE));
2711 _exit(run_list(head));
2712#else
2713 _exit(run_list_real(head)); /* leaks memory */
2714#endif
2715 }
2716 debug_printf("forked child %d\n",pid);
2717 close(channel[1]);
2718 pf = fdopen(channel[0],"r");
2719 debug_printf("pipe on FILE *%p\n",pf);
2720#else
2721 free_pipe_list(head,0);
2722 pf=popen("echo surrogate response","r");
2723 debug_printf("started fake pipe on FILE *%p\n",pf);
2724#endif
2725 return pf;
2726}
2727
2728/* this version hacked for testing purposes */
2729/* return code is exit status of the process that is run. */
2730static int process_command_subs(o_string *dest, struct p_context *ctx, struct in_str *input, int subst_end)
2731{
2732 int retcode;
2733 o_string result=NULL_O_STRING;
2734 struct p_context inner;
2735 FILE *p;
2736 struct in_str pipe_str;
2737 initialize_context(&inner);
2738
2739 /* recursion to generate command */
2740 retcode = parse_stream(&result, &inner, input, subst_end);
2741 if (retcode != 0) return retcode; /* syntax error or EOF */
2742 done_word(&result, &inner);
2743 done_pipe(&inner, PIPE_SEQ);
2744 b_free(&result);
2745
2746 p=generate_stream_from_list(inner.list_head);
2747 if (p==NULL) return 1;
2748 mark_open(fileno(p));
2749 setup_file_in_str(&pipe_str, p);
2750
2751 /* now send results of command back into original context */
2752 retcode = parse_stream(dest, ctx, &pipe_str, '\0');
2753 /* XXX In case of a syntax error, should we try to kill the child?
2754 * That would be tough to do right, so just read until EOF. */
2755 if (retcode == 1) {
2756 while (b_getch(&pipe_str)!=EOF) { /* discard */ };
2757 }
2758
2759 debug_printf("done reading from pipe, pclose()ing\n");
2760 /* This is the step that wait()s for the child. Should be pretty
2761 * safe, since we just read an EOF from its stdout. We could try
2762 * to better, by using wait(), and keeping track of background jobs
2763 * at the same time. That would be a lot of work, and contrary
2764 * to the KISS philosophy of this program. */
2765 mark_closed(fileno(p));
2766 retcode=pclose(p);
2767 free_pipe_list(inner.list_head,0);
2768 debug_printf("pclosed, retcode=%d\n",retcode);
2769 /* XXX this process fails to trim a single trailing newline */
2770 return retcode;
2771}
2772
2773static int parse_group(o_string *dest, struct p_context *ctx,
2774 struct in_str *input, int ch)
2775{
2776 int rcode, endch=0;
2777 struct p_context sub;
2778 struct child_prog *child = ctx->child;
2779 if (child->argv) {
2780 syntax();
2781 return 1; /* syntax error, groups and arglists don't mix */
2782 }
2783 initialize_context(&sub);
2784 switch(ch) {
2785 case '(': endch=')'; child->subshell=1; break;
2786 case '{': endch='}'; break;
2787 default: syntax(); /* really logic error */
2788 }
2789 rcode=parse_stream(dest,&sub,input,endch);
2790 done_word(dest,&sub); /* finish off the final word in the subcontext */
2791 done_pipe(&sub, PIPE_SEQ); /* and the final command there, too */
2792 child->group = sub.list_head;
2793 return rcode;
2794 /* child remains "open", available for possible redirects */
2795}
2796#endif
2797
2798/* basically useful version until someone wants to get fancier,
2799 * see the bash man page under "Parameter Expansion" */
2800static char *lookup_param(char *src)
2801{
c26e454d
WD		 2802 char *p;
2803
2804 if (!src)
2805 return NULL;
2806
fe8c2806
WD		 2807 p = getenv(src);
2808 if (!p)
2809 p = get_local_var(src);
c26e454d 2810
fe8c2806
WD		 2811 return p;
2812}
2813
c26e454d
WD		 2814#ifdef __U_BOOT__
2815static char *get_dollar_var(char ch)
2816{
2817 static char buf[40];
2818
2819 buf[0] = '\0';
2820 switch (ch) {
2821 case '?':
2822 sprintf(buf, "%u", (unsigned int)last_return_code);
2823 break;
2824 default:
2825 return NULL;
2826 }
2827 return buf;
2828}
2829#endif
2830
fe8c2806
WD		 2831/* return code: 0 for OK, 1 for syntax error */
2832static int handle_dollar(o_string *dest, struct p_context *ctx, struct in_str *input)
2833{
2834#ifndef __U_BOOT__
2835 int i, advance=0;
2836#else
2837 int advance=0;
2838#endif
2839#ifndef __U_BOOT__
2840 char sep[]=" ";
2841#endif
2842 int ch = input->peek(input); /* first character after the $ */
2843 debug_printf("handle_dollar: ch=%c\n",ch);
2844 if (isalpha(ch)) {
2845 b_addchr(dest, SPECIAL_VAR_SYMBOL);
2846 ctx->child->sp++;
2847 while(ch=b_peek(input),isalnum(ch) || ch=='_') {
2848 b_getch(input);
2849 b_addchr(dest,ch);
2850 }
2851 b_addchr(dest, SPECIAL_VAR_SYMBOL);
2852#ifndef __U_BOOT__
2853 } else if (isdigit(ch)) {
2854 i = ch-'0'; /* XXX is $0 special? */
2855 if (i<global_argc) {
2856 parse_string(dest, ctx, global_argv[i]); /* recursion */
2857 }
2858 advance = 1;
2859#endif
2860 } else switch (ch) {
2861#ifndef __U_BOOT__
2862 case '$':
2863 b_adduint(dest,getpid());
2864 advance = 1;
2865 break;
2866 case '!':
2867 if (last_bg_pid > 0) b_adduint(dest, last_bg_pid);
2868 advance = 1;
2869 break;
2870#endif
2871 case '?':
c26e454d 2872#ifndef __U_BOOT__
fe8c2806 2873 b_adduint(dest,last_return_code);
c26e454d
WD		 2874#else
2875 ctx->child->sp++;
2876 b_addchr(dest, SPECIAL_VAR_SYMBOL);
2877 b_addchr(dest, '$');
2878 b_addchr(dest, '?');
2879 b_addchr(dest, SPECIAL_VAR_SYMBOL);
2880#endif
fe8c2806
WD		 2881 advance = 1;
2882 break;
2883#ifndef __U_BOOT__
2884 case '#':
2885 b_adduint(dest,global_argc ? global_argc-1 : 0);
2886 advance = 1;
2887 break;
2888#endif
2889 case '{':
2890 b_addchr(dest, SPECIAL_VAR_SYMBOL);
2891 ctx->child->sp++;
2892 b_getch(input);
2893 /* XXX maybe someone will try to escape the '}' */
2894 while(ch=b_getch(input),ch!=EOF && ch!='}') {
2895 b_addchr(dest,ch);
2896 }
2897 if (ch != '}') {
2898 syntax();
2899 return 1;
2900 }
2901 b_addchr(dest, SPECIAL_VAR_SYMBOL);
2902 break;
2903#ifndef __U_BOOT__
2904 case '(':
2905 b_getch(input);
2906 process_command_subs(dest, ctx, input, ')');
2907 break;
2908 case '*':
2909 sep[0]=ifs[0];
2910 for (i=1; i<global_argc; i++) {
2911 parse_string(dest, ctx, global_argv[i]);
2912 if (i+1 < global_argc) parse_string(dest, ctx, sep);
2913 }
2914 break;
2915 case '@':
2916 case '-':
2917 case '_':
2918 /* still unhandled, but should be eventually */
2919 error_msg("unhandled syntax: $%c",ch);
2920 return 1;
2921 break;
2922#endif
2923 default:
2924 b_addqchr(dest,'$',dest->quote);
2925 }
2926 /* Eat the character if the flag was set. If the compiler
2927 * is smart enough, we could substitute "b_getch(input);"
2928 * for all the "advance = 1;" above, and also end up with
2929 * a nice size-optimized program. Hah! That'll be the day.
2930 */
2931 if (advance) b_getch(input);
2932 return 0;
2933}
2934
2935#ifndef __U_BOOT__
2936int parse_string(o_string *dest, struct p_context *ctx, const char *src)
2937{
2938 struct in_str foo;
2939 setup_string_in_str(&foo, src);
2940 return parse_stream(dest, ctx, &foo, '\0');
2941}
2942#endif
2943
2944/* return code is 0 for normal exit, 1 for syntax error */
2945int parse_stream(o_string *dest, struct p_context *ctx,
2946 struct in_str *input, int end_trigger)
2947{
2948 unsigned int ch, m;
2949#ifndef __U_BOOT__
2950 int redir_fd;
2951 redir_type redir_style;
2952#endif
2953 int next;
2954
2955 /* Only double-quote state is handled in the state variable dest->quote.
2956 * A single-quote triggers a bypass of the main loop until its mate is
2957 * found. When recursing, quote state is passed in via dest->quote. */
2958
2959 debug_printf("parse_stream, end_trigger=%d\n",end_trigger);
2960 while ((ch=b_getch(input))!=EOF) {
2961 m = map[ch];
2962#ifdef __U_BOOT__
2963 if (input->__promptme == 0) return 1;
2964#endif
2965 next = (ch == '\n') ? 0 : b_peek(input);
c26e454d
WD		 2966
2967 debug_printf("parse_stream: ch=%c (%d) m=%d quote=%d - %c\n",
2968 ch >= ' ' ? ch : '.', ch, m,
2969 dest->quote, ctx->stack == NULL ? '*' : '.');
2970
fe8c2806
WD		 2971 if (m==0 || ((m==1 || m==2) && dest->quote)) {
2972 b_addqchr(dest, ch, dest->quote);
2973 } else {
2974 if (m==2) { /* unquoted IFS */
2975 if (done_word(dest, ctx)) {
2976 return 1;
2977 }
2978 /* If we aren't performing a substitution, treat a newline as a
2979 * command separator. */
2980 if (end_trigger != '\0' && ch=='\n')
2981 done_pipe(ctx,PIPE_SEQ);
2982 }
2983 if (ch == end_trigger && !dest->quote && ctx->w==RES_NONE) {
2984 debug_printf("leaving parse_stream (triggered)\n");
2985 return 0;
2986 }
2987#if 0
2988 if (ch=='\n') {
2989 /* Yahoo! Time to run with it! */
2990 done_pipe(ctx,PIPE_SEQ);
2991 run_list(ctx->list_head);
2992 initialize_context(ctx);
2993 }
2994#endif
2995 if (m!=2) switch (ch) {
2996 case '#':
2997 if (dest->length == 0 && !dest->quote) {
2998 while(ch=b_peek(input),ch!=EOF && ch!='\n') { b_getch(input); }
2999 } else {
3000 b_addqchr(dest, ch, dest->quote);
3001 }
3002 break;
3003 case '\\':
3004 if (next == EOF) {
3005 syntax();
3006 return 1;
3007 }
3008 b_addqchr(dest, '\\', dest->quote);
3009 b_addqchr(dest, b_getch(input), dest->quote);
3010 break;
3011 case '$':
3012 if (handle_dollar(dest, ctx, input)!=0) return 1;
3013 break;
3014 case '\'':
3015 dest->nonnull = 1;
3016 while(ch=b_getch(input),ch!=EOF && ch!='\'') {
3017#ifdef __U_BOOT__
3018 if(input->__promptme == 0) return 1;
3019#endif
3020 b_addchr(dest,ch);
3021 }
3022 if (ch==EOF) {
3023 syntax();
3024 return 1;
3025 }
3026 break;
3027 case '"':
3028 dest->nonnull = 1;
3029 dest->quote = !dest->quote;
3030 break;
3031#ifndef __U_BOOT__
3032 case '`':
3033 process_command_subs(dest, ctx, input, '`');
3034 break;
3035 case '>':
3036 redir_fd = redirect_opt_num(dest);
3037 done_word(dest, ctx);
3038 redir_style=REDIRECT_OVERWRITE;
3039 if (next == '>') {
3040 redir_style=REDIRECT_APPEND;
3041 b_getch(input);
3042 } else if (next == '(') {
3043 syntax(); /* until we support >(list) Process Substitution */
3044 return 1;
3045 }
3046 setup_redirect(ctx, redir_fd, redir_style, input);
3047 break;
3048 case '<':
3049 redir_fd = redirect_opt_num(dest);
3050 done_word(dest, ctx);
3051 redir_style=REDIRECT_INPUT;
3052 if (next == '<') {
3053 redir_style=REDIRECT_HEREIS;
3054 b_getch(input);
3055 } else if (next == '>') {
3056 redir_style=REDIRECT_IO;
3057 b_getch(input);
3058 } else if (next == '(') {
3059 syntax(); /* until we support <(list) Process Substitution */
3060 return 1;
3061 }
3062 setup_redirect(ctx, redir_fd, redir_style, input);
3063 break;
3064#endif
3065 case ';':
3066 done_word(dest, ctx);
3067 done_pipe(ctx,PIPE_SEQ);
3068 break;
3069 case '&':
3070 done_word(dest, ctx);
3071 if (next=='&') {
3072 b_getch(input);
3073 done_pipe(ctx,PIPE_AND);
3074 } else {
3075#ifndef __U_BOOT__
3076 done_pipe(ctx,PIPE_BG);
3077#else
3078 syntax_err();
3079 return 1;
3080#endif
3081 }
3082 break;
3083 case '|':
3084 done_word(dest, ctx);
3085 if (next=='|') {
3086 b_getch(input);
3087 done_pipe(ctx,PIPE_OR);
3088 } else {
3089 /* we could pick up a file descriptor choice here
3090 * with redirect_opt_num(), but bash doesn't do it.
3091 * "echo foo 2| cat" yields "foo 2". */
3092#ifndef __U_BOOT__
3093 done_command(ctx);
3094#else
3095 syntax_err();
3096 return 1;
3097#endif
3098 }
3099 break;
3100#ifndef __U_BOOT__
3101 case '(':
3102 case '{':
3103 if (parse_group(dest, ctx, input, ch)!=0) return 1;
3104 break;
3105 case ')':
3106 case '}':
3107 syntax(); /* Proper use of this character caught by end_trigger */
3108 return 1;
3109 break;
3110#endif
3111 default:
3112 syntax(); /* this is really an internal logic error */
3113 return 1;
3114 }
3115 }
3116 }
3117 /* complain if quote? No, maybe we just finished a command substitution
3118 * that was quoted. Example:
3119 * $ echo "`cat foo` plus more"
3120 * and we just got the EOF generated by the subshell that ran "cat foo"
3121 * The only real complaint is if we got an EOF when end_trigger != '\0',
3122 * that is, we were really supposed to get end_trigger, and never got
3123 * one before the EOF. Can't use the standard "syntax error" return code,
3124 * so that parse_stream_outer can distinguish the EOF and exit smoothly. */
3125 debug_printf("leaving parse_stream (EOF)\n");
3126 if (end_trigger != '\0') return -1;
3127 return 0;
3128}
3129
3130void mapset(const unsigned char *set, int code)
3131{
3132 const unsigned char *s;
3133 for (s=set; *s; s++) map[*s] = code;
3134}
3135
3136void update_ifs_map(void)
3137{
3138 /* char *ifs and char map[256] are both globals. */
77ddac94
WD		 3139 ifs = (uchar *)getenv("IFS");
3140 if (ifs == NULL) ifs=(uchar *)" \t\n";
fe8c2806
WD		 3141 /* Precompute a list of 'flow through' behavior so it can be treated
3142 * quickly up front. Computation is necessary because of IFS.
3143 * Special case handling of IFS == " \t\n" is not implemented.
3144 * The map[] array only really needs two bits each, and on most machines
3145 * that would be faster because of the reduced L1 cache footprint.
3146 */
3147 memset(map,0,sizeof(map)); /* most characters flow through always */
3148#ifndef __U_BOOT__
77ddac94
WD		 3149 mapset((uchar *)"\\$'\"`", 3); /* never flow through */
3150 mapset((uchar *)"<>;&|(){}#", 1); /* flow through if quoted */
fe8c2806 3151#else
77ddac94
WD		 3152 mapset((uchar *)"\\$'\"", 3); /* never flow through */
3153 mapset((uchar *)";&|#", 1); /* flow through if quoted */
fe8c2806
WD		 3154#endif
3155 mapset(ifs, 2); /* also flow through if quoted */
3156}
3157
3158/* most recursion does not come through here, the exeception is
3159 * from builtin_source() */
3160int parse_stream_outer(struct in_str *inp, int flag)
3161{
3162
3163 struct p_context ctx;
3164 o_string temp=NULL_O_STRING;
3165 int rcode;
3166#ifdef __U_BOOT__
3167 int code = 0;
3168#endif
3169 do {
3170 ctx.type = flag;
3171 initialize_context(&ctx);
3172 update_ifs_map();
77ddac94 3173 if (!(flag & FLAG_PARSE_SEMICOLON) || (flag & FLAG_REPARSING)) mapset((uchar *)";$&|", 0);
fe8c2806
WD		 3174 inp->promptmode=1;
3175 rcode = parse_stream(&temp, &ctx, inp, '\n');
3176#ifdef __U_BOOT__
3177 if (rcode == 1) flag_repeat = 0;
3178#endif
3179 if (rcode != 1 && ctx.old_flag != 0) {
3180 syntax();
3181#ifdef __U_BOOT__
3182 flag_repeat = 0;
3183#endif
3184 }
3185 if (rcode != 1 && ctx.old_flag == 0) {
3186 done_word(&temp, &ctx);
3187 done_pipe(&ctx,PIPE_SEQ);
3188#ifndef __U_BOOT__
3189 run_list(ctx.list_head);
3190#else
c26e454d
WD		 3191 code = run_list(ctx.list_head);
3192 if (code == -2) { /* exit */
3193 b_free(&temp);
3194 code = 0;
3195 /* XXX hackish way to not allow exit from main loop */
3196 if (inp->peek == file_peek) {
3197 printf("exit not allowed from main input shell.\n");
3198 continue;
3199 }
3200 break;
3201 }
3202 if (code == -1)
fe8c2806
WD		 3203 flag_repeat = 0;
3204#endif
3205 } else {
3206 if (ctx.old_flag != 0) {
3207 free(ctx.stack);
3208 b_reset(&temp);
3209 }
3210#ifdef __U_BOOT__
3211 if (inp->__promptme == 0) printf("<INTERRUPT>\n");
3212 inp->__promptme = 1;
3213#endif
3214 temp.nonnull = 0;
3215 temp.quote = 0;
3216 inp->p = NULL;
3217 free_pipe_list(ctx.list_head,0);
3218 }
3219 b_free(&temp);
3220 } while (rcode != -1 && !(flag & FLAG_EXIT_FROM_LOOP)); /* loop on syntax errors, return on EOF */
3221#ifndef __U_BOOT__
3222 return 0;
3223#else
3224 return (code != 0) ? 1 : 0;
3225#endif /* __U_BOOT__ */
3226}
3227
3228#ifndef __U_BOOT__
3229static int parse_string_outer(const char *s, int flag)
3230#else
3231int parse_string_outer(char *s, int flag)
3232#endif /* __U_BOOT__ */
3233{
3234 struct in_str input;
3235#ifdef __U_BOOT__
3236 char *p = NULL;
3237 int rcode;
3238 if ( !s || !*s)
3239 return 1;
3240 if (!(p = strchr(s, '\n')) || *++p) {
3241 p = xmalloc(strlen(s) + 2);
3242 strcpy(p, s);
3243 strcat(p, "\n");
3244 setup_string_in_str(&input, p);
3245 rcode = parse_stream_outer(&input, flag);
3246 free(p);
3247 return rcode;
3248 } else {
3249#endif
3250 setup_string_in_str(&input, s);
3251 return parse_stream_outer(&input, flag);
3252#ifdef __U_BOOT__
3253 }
3254#endif
3255}
3256
3257#ifndef __U_BOOT__
3258static int parse_file_outer(FILE *f)
3259#else
3260int parse_file_outer(void)
3261#endif
3262{
3263 int rcode;
3264 struct in_str input;
3265#ifndef __U_BOOT__
3266 setup_file_in_str(&input, f);
3267#else
3268 setup_file_in_str(&input);
3269#endif
3270 rcode = parse_stream_outer(&input, FLAG_PARSE_SEMICOLON);
3271 return rcode;
3272}
3273
3274#ifdef __U_BOOT__
3e38691e
WD		 3275static void u_boot_hush_reloc(void)
3276{
3e38691e
WD		 3277 unsigned long addr;
3278 struct reserved_combo *r;
3279
3280 for (r=reserved_list; r<reserved_list+NRES; r++) {
3281 addr = (ulong) (r->literal) + gd->reloc_off;
3282 r->literal = (char *)addr;
3283 }
3284}
3285
fe8c2806
WD		 3286int u_boot_hush_start(void)
3287{
2d5b561e
WD		 3288 if (top_vars == NULL) {
3289 top_vars = malloc(sizeof(struct variables));
3290 top_vars->name = "HUSH_VERSION";
3291 top_vars->value = "0.01";
3292 top_vars->next = 0;
3293 top_vars->flg_export = 0;
3294 top_vars->flg_read_only = 1;
3295 u_boot_hush_reloc();
3296 }
fe8c2806
WD		 3297 return 0;
3298}
3299
3300static void *xmalloc(size_t size)
3301{
3302 void *p = NULL;
3303
3304 if (!(p = malloc(size))) {
3305 printf("ERROR : memory not allocated\n");
3306 for(;;);
3307 }
3308 return p;
3309}
3310
3311static void *xrealloc(void *ptr, size_t size)
3312{
3313 void *p = NULL;
3314
3315 if (!(p = realloc(ptr, size))) {
3316 printf("ERROR : memory not allocated\n");
3317 for(;;);
3318 }
3319 return p;
3320}
3321#endif /* __U_BOOT__ */
3322
3323#ifndef __U_BOOT__
3324/* Make sure we have a controlling tty. If we get started under a job
3325 * aware app (like bash for example), make sure we are now in charge so
3326 * we don't fight over who gets the foreground */
d0fb80c3 3327static void setup_job_control(void)
fe8c2806
WD		 3328{
3329 static pid_t shell_pgrp;
3330 /* Loop until we are in the foreground. */
3331 while (tcgetpgrp (shell_terminal) != (shell_pgrp = getpgrp ()))
3332 kill (- shell_pgrp, SIGTTIN);
3333
3334 /* Ignore interactive and job-control signals. */
3335 signal(SIGINT, SIG_IGN);
3336 signal(SIGQUIT, SIG_IGN);
3337 signal(SIGTERM, SIG_IGN);
3338 signal(SIGTSTP, SIG_IGN);
3339 signal(SIGTTIN, SIG_IGN);
3340 signal(SIGTTOU, SIG_IGN);
3341 signal(SIGCHLD, SIG_IGN);
3342
3343 /* Put ourselves in our own process group. */
3344 setsid();
3345 shell_pgrp = getpid ();
3346 setpgid (shell_pgrp, shell_pgrp);
3347
3348 /* Grab control of the terminal. */
3349 tcsetpgrp(shell_terminal, shell_pgrp);
3350}
3351
3352int hush_main(int argc, char **argv)
3353{
3354 int opt;
3355 FILE *input;
3356 char **e = environ;
3357
3358 /* XXX what should these be while sourcing /etc/profile? */
3359 global_argc = argc;
3360 global_argv = argv;
3361
3362 /* (re?) initialize globals. Sometimes hush_main() ends up calling
3363 * hush_main(), therefore we cannot rely on the BSS to zero out this
3364 * stuff. Reset these to 0 every time. */
3365 ifs = NULL;
3366 /* map[] is taken care of with call to update_ifs_map() */
3367 fake_mode = 0;
3368 interactive = 0;
3369 close_me_head = NULL;
3370 last_bg_pid = 0;
3371 job_list = NULL;
3372 last_jobid = 0;
3373
3374 /* Initialize some more globals to non-zero values */
3375 set_cwd();
d0fb80c3 3376#ifdef CONFIG_FEATURE_COMMAND_EDITING
fe8c2806
WD		 3377 cmdedit_set_initial_prompt();
3378#else
3379 PS1 = NULL;
3380#endif
3381 PS2 = "> ";
3382
3383 /* initialize our shell local variables with the values
3384 * currently living in the environment */
3385 if (e) {
3386 for (; *e; e++)
3387 set_local_var(*e, 2); /* without call putenv() */
3388 }
3389
3390 last_return_code=EXIT_SUCCESS;
3391
3392
3393 if (argv[0] && argv[0][0] == '-') {
3394 debug_printf("\nsourcing /etc/profile\n");
3395 if ((input = fopen("/etc/profile", "r")) != NULL) {
3396 mark_open(fileno(input));
3397 parse_file_outer(input);
3398 mark_closed(fileno(input));
3399 fclose(input);
3400 }
3401 }
3402 input=stdin;
3403
3404 while ((opt = getopt(argc, argv, "c:xif")) > 0) {
3405 switch (opt) {
3406 case 'c':
3407 {
3408 global_argv = argv+optind;
3409 global_argc = argc-optind;
3410 opt = parse_string_outer(optarg, FLAG_PARSE_SEMICOLON);
3411 goto final_return;
3412 }
3413 break;
3414 case 'i':
3415 interactive++;
3416 break;
3417 case 'f':
3418 fake_mode++;
3419 break;
3420 default:
3421#ifndef BB_VER
3422 fprintf(stderr, "Usage: sh [FILE]...\n"
3423 " or: sh -c command [args]...\n\n");
3424 exit(EXIT_FAILURE);
3425#else
3426 show_usage();
3427#endif
3428 }
3429 }
3430 /* A shell is interactive if the `-i' flag was given, or if all of
3431 * the following conditions are met:
3432 * no -c command
3433 * no arguments remaining or the -s flag given
3434 * standard input is a terminal
3435 * standard output is a terminal
3436 * Refer to Posix.2, the description of the `sh' utility. */
3437 if (argv[optind]==NULL && input==stdin &&
3438 isatty(fileno(stdin)) && isatty(fileno(stdout))) {
3439 interactive++;
3440 }
3441
3442 debug_printf("\ninteractive=%d\n", interactive);
3443 if (interactive) {
3444 /* Looks like they want an interactive shell */
8bde7f77 3445#ifndef CONFIG_FEATURE_SH_EXTRA_QUIET
d0fb80c3
WD		 3446 printf( "\n\n" BB_BANNER " hush - the humble shell v0.01 (testing)\n");
3447 printf( "Enter 'help' for a list of built-in commands.\n\n");
3448#endif
fe8c2806
WD		 3449 setup_job_control();
3450 }
3451
3452 if (argv[optind]==NULL) {
3453 opt=parse_file_outer(stdin);
3454 goto final_return;
3455 }
3456
3457 debug_printf("\nrunning script '%s'\n", argv[optind]);
3458 global_argv = argv+optind;
3459 global_argc = argc-optind;
3460 input = xfopen(argv[optind], "r");
3461 opt = parse_file_outer(input);
3462
d0fb80c3 3463#ifdef CONFIG_FEATURE_CLEAN_UP
fe8c2806
WD		 3464 fclose(input);
3465 if (cwd && cwd != unknown)
3466 free((char*)cwd);
3467 {
3468 struct variables *cur, *tmp;
3469 for(cur = top_vars; cur; cur = tmp) {
3470 tmp = cur->next;
3471 if (!cur->flg_read_only) {
3472 free(cur->name);
3473 free(cur->value);
3474 free(cur);
3475 }
3476 }
3477 }
3478#endif
3479
3480final_return:
3481 return(opt?opt:last_return_code);
3482}
3483#endif
3484
3485static char *insert_var_value(char *inp)
3486{
3487 int res_str_len = 0;
3488 int len;
3489 int done = 0;
3490 char *p, *p1, *res_str = NULL;
3491
3492 while ((p = strchr(inp, SPECIAL_VAR_SYMBOL))) {
3493 if (p != inp) {
3494 len = p - inp;
3495 res_str = xrealloc(res_str, (res_str_len + len));
3496 strncpy((res_str + res_str_len), inp, len);
3497 res_str_len += len;
3498 }
3499 inp = ++p;
3500 p = strchr(inp, SPECIAL_VAR_SYMBOL);
3501 *p = '\0';
3502 if ((p1 = lookup_param(inp))) {
3503 len = res_str_len + strlen(p1);
3504 res_str = xrealloc(res_str, (1 + len));
3505 strcpy((res_str + res_str_len), p1);
3506 res_str_len = len;
3507 }
3508 *p = SPECIAL_VAR_SYMBOL;
3509 inp = ++p;
3510 done = 1;
3511 }
3512 if (done) {
3513 res_str = xrealloc(res_str, (1 + res_str_len + strlen(inp)));
3514 strcpy((res_str + res_str_len), inp);
3515 while ((p = strchr(res_str, '\n'))) {
3516 *p = ' ';
3517 }
3518 }
3519 return (res_str == NULL) ? inp : res_str;
3520}
3521
3522static char **make_list_in(char **inp, char *name)
3523{
3524 int len, i;
3525 int name_len = strlen(name);
3526 int n = 0;
3527 char **list;
3528 char *p1, *p2, *p3;
3529
3530 /* create list of variable values */
3531 list = xmalloc(sizeof(*list));
3532 for (i = 0; inp[i]; i++) {
3533 p3 = insert_var_value(inp[i]);
3534 p1 = p3;
3535 while (*p1) {
3536 if ((*p1 == ' ')) {
3537 p1++;
3538 continue;
3539 }
3540 if ((p2 = strchr(p1, ' '))) {
3541 len = p2 - p1;
3542 } else {
3543 len = strlen(p1);
3544 p2 = p1 + len;
3545 }
3546 /* we use n + 2 in realloc for list,because we add
3547 * new element and then we will add NULL element */
3548 list = xrealloc(list, sizeof(*list) * (n + 2));
3549 list[n] = xmalloc(2 + name_len + len);
3550 strcpy(list[n], name);
3551 strcat(list[n], "=");
3552 strncat(list[n], p1, len);
3553 list[n++][name_len + len + 1] = '\0';
3554 p1 = p2;
3555 }
3556 if (p3 != inp[i]) free(p3);
3557 }
3558 list[n] = NULL;
3559 return list;
3560}
3561
3562/* Make new string for parser */
3563static char * make_string(char ** inp)
3564{
3565 char *p;
3566 char *str = NULL;
3567 int n;
3568 int len = 2;
3569
3570 for (n = 0; inp[n]; n++) {
3571 p = insert_var_value(inp[n]);
3572 str = xrealloc(str, (len + strlen(p)));
3573 if (n) {
3574 strcat(str, " ");
3575 } else {
3576 *str = '\0';
3577 }
3578 strcat(str, p);
3579 len = strlen(str) + 3;
3580 if (p != inp[n]) free(p);
3581 }
3582 len = strlen(str);
3583 *(str + len) = '\n';
3584 *(str + len + 1) = '\0';
3585 return str;
3586}
3587
3588#endif /* CFG_HUSH_PARSER */
3589/****************************************************************************/
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