blob: bb5041a08d872d93b04077fab9edadbd02fca12c [file] [log] [blame]
wdenkfe8c2802002-11-03 00:38:21 +00001/* 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 */
wdenk8bde7f72003-06-27 21:31:46 +000097/*cmd_boot.c*/
98extern int do_bootd (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]); /* do_bootd */
wdenkfe8c2802002-11-03 00:38:21 +000099#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
wdenkd0fb80c2003-01-11 09:48:40 +0000121#if 1
wdenkfe8c2802002-11-03 00:38:21 +0000122#include "busybox.h"
123#include "cmdedit.h"
124#else
125#define applet_name "hush"
126#include "standalone.h"
127#define hush_main main
wdenkd0fb80c2003-01-11 09:48:40 +0000128#undef CONFIG_FEATURE_SH_FANCY_PROMPT
129#define BB_BANNER
wdenkfe8c2802002-11-03 00:38:21 +0000130#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__
141#define EXIT_SUCCESS 0
142#define EOF -1
143#define syntax() syntax_err()
144#define xstrdup strdup
145#define error_msg printf
146#else
147typedef enum {
148 REDIRECT_INPUT = 1,
149 REDIRECT_OVERWRITE = 2,
150 REDIRECT_APPEND = 3,
151 REDIRECT_HEREIS = 4,
152 REDIRECT_IO = 5
153} redir_type;
154
155/* The descrip member of this structure is only used to make debugging
156 * output pretty */
157struct {int mode; int default_fd; char *descrip;} redir_table[] = {
158 { 0, 0, "()" },
159 { O_RDONLY, 0, "<" },
160 { O_CREAT|O_TRUNC|O_WRONLY, 1, ">" },
161 { O_CREAT|O_APPEND|O_WRONLY, 1, ">>" },
162 { O_RDONLY, -1, "<<" },
163 { O_RDWR, 1, "<>" }
164};
165#endif
166
167typedef enum {
168 PIPE_SEQ = 1,
169 PIPE_AND = 2,
170 PIPE_OR = 3,
171 PIPE_BG = 4,
172} pipe_style;
173
174/* might eventually control execution */
175typedef enum {
176 RES_NONE = 0,
177 RES_IF = 1,
178 RES_THEN = 2,
179 RES_ELIF = 3,
180 RES_ELSE = 4,
181 RES_FI = 5,
182 RES_FOR = 6,
183 RES_WHILE = 7,
184 RES_UNTIL = 8,
185 RES_DO = 9,
186 RES_DONE = 10,
187 RES_XXXX = 11,
188 RES_IN = 12,
189 RES_SNTX = 13
190} reserved_style;
191#define FLAG_END (1<<RES_NONE)
192#define FLAG_IF (1<<RES_IF)
193#define FLAG_THEN (1<<RES_THEN)
194#define FLAG_ELIF (1<<RES_ELIF)
195#define FLAG_ELSE (1<<RES_ELSE)
196#define FLAG_FI (1<<RES_FI)
197#define FLAG_FOR (1<<RES_FOR)
198#define FLAG_WHILE (1<<RES_WHILE)
199#define FLAG_UNTIL (1<<RES_UNTIL)
200#define FLAG_DO (1<<RES_DO)
201#define FLAG_DONE (1<<RES_DONE)
202#define FLAG_IN (1<<RES_IN)
203#define FLAG_START (1<<RES_XXXX)
204
205/* This holds pointers to the various results of parsing */
206struct p_context {
207 struct child_prog *child;
208 struct pipe *list_head;
209 struct pipe *pipe;
210#ifndef __U_BOOT__
211 struct redir_struct *pending_redirect;
212#endif
213 reserved_style w;
214 int old_flag; /* for figuring out valid reserved words */
215 struct p_context *stack;
216 int type; /* define type of parser : ";$" common or special symbol */
217 /* How about quoting status? */
218};
219
220#ifndef __U_BOOT__
221struct redir_struct {
222 redir_type type; /* type of redirection */
223 int fd; /* file descriptor being redirected */
224 int dup; /* -1, or file descriptor being duplicated */
225 struct redir_struct *next; /* pointer to the next redirect in the list */
226 glob_t word; /* *word.gl_pathv is the filename */
227};
228#endif
229
230struct child_prog {
231#ifndef __U_BOOT__
232 pid_t pid; /* 0 if exited */
233#endif
234 char **argv; /* program name and arguments */
235#ifdef __U_BOOT__
236 int argc; /* number of program arguments */
237#endif
238 struct pipe *group; /* if non-NULL, first in group or subshell */
239#ifndef __U_BOOT__
240 int subshell; /* flag, non-zero if group must be forked */
241 struct redir_struct *redirects; /* I/O redirections */
242 glob_t glob_result; /* result of parameter globbing */
243 int is_stopped; /* is the program currently running? */
244 struct pipe *family; /* pointer back to the child's parent pipe */
245#endif
246 int sp; /* number of SPECIAL_VAR_SYMBOL */
247 int type;
248};
249
250struct pipe {
251#ifndef __U_BOOT__
252 int jobid; /* job number */
253#endif
254 int num_progs; /* total number of programs in job */
255#ifndef __U_BOOT__
256 int running_progs; /* number of programs running */
257 char *text; /* name of job */
258 char *cmdbuf; /* buffer various argv's point into */
259 pid_t pgrp; /* process group ID for the job */
260#endif
261 struct child_prog *progs; /* array of commands in pipe */
262 struct pipe *next; /* to track background commands */
263#ifndef __U_BOOT__
264 int stopped_progs; /* number of programs alive, but stopped */
265 int job_context; /* bitmask defining current context */
266#endif
267 pipe_style followup; /* PIPE_BG, PIPE_SEQ, PIPE_OR, PIPE_AND */
268 reserved_style r_mode; /* supports if, for, while, until */
269};
270
271#ifndef __U_BOOT__
272struct close_me {
273 int fd;
274 struct close_me *next;
275};
276#endif
277
278struct variables {
279 char *name;
280 char *value;
281 int flg_export;
282 int flg_read_only;
283 struct variables *next;
284};
285
286/* globals, connect us to the outside world
287 * the first three support $?, $#, and $1 */
288#ifndef __U_BOOT__
289char **global_argv;
290unsigned int global_argc;
291#endif
292unsigned int last_return_code;
wdenkc26e4542004-04-18 10:13:26 +0000293int nesting_level;
wdenkfe8c2802002-11-03 00:38:21 +0000294#ifndef __U_BOOT__
295extern char **environ; /* This is in <unistd.h>, but protected with __USE_GNU */
296#endif
297
298/* "globals" within this file */
Wolfgang Denk77ddac92005-10-13 16:45:02 +0200299static uchar *ifs;
wdenkfe8c2802002-11-03 00:38:21 +0000300static char map[256];
301#ifndef __U_BOOT__
302static int fake_mode;
303static int interactive;
304static struct close_me *close_me_head;
305static const char *cwd;
306static struct pipe *job_list;
307static unsigned int last_bg_pid;
308static unsigned int last_jobid;
309static unsigned int shell_terminal;
310static char *PS1;
311static char *PS2;
312struct variables shell_ver = { "HUSH_VERSION", "0.01", 1, 1, 0 };
313struct variables *top_vars = &shell_ver;
314#else
315static int flag_repeat = 0;
316static int do_repeat = 0;
wdenk2d5b5612003-10-14 19:43:55 +0000317static struct variables *top_vars = NULL ;
wdenkfe8c2802002-11-03 00:38:21 +0000318#endif /*__U_BOOT__ */
319
320#define B_CHUNK (100)
321#define B_NOSPAC 1
322
323typedef struct {
324 char *data;
325 int length;
326 int maxlen;
327 int quote;
328 int nonnull;
329} o_string;
330#define NULL_O_STRING {NULL,0,0,0,0}
331/* used for initialization:
332 o_string foo = NULL_O_STRING; */
333
334/* I can almost use ordinary FILE *. Is open_memstream() universally
335 * available? Where is it documented? */
336struct in_str {
337 const char *p;
338#ifndef __U_BOOT__
339 char peek_buf[2];
340#endif
341 int __promptme;
342 int promptmode;
343#ifndef __U_BOOT__
344 FILE *file;
345#endif
346 int (*get) (struct in_str *);
347 int (*peek) (struct in_str *);
348};
349#define b_getch(input) ((input)->get(input))
350#define b_peek(input) ((input)->peek(input))
351
352#ifndef __U_BOOT__
353#define JOB_STATUS_FORMAT "[%d] %-22s %.40s\n"
354
355struct built_in_command {
356 char *cmd; /* name */
357 char *descr; /* description */
358 int (*function) (struct child_prog *); /* function ptr */
359};
360#endif
361
wdenkfe8c2802002-11-03 00:38:21 +0000362/* This should be in utility.c */
363#ifdef DEBUG_SHELL
364#ifndef __U_BOOT__
365static void debug_printf(const char *format, ...)
366{
367 va_list args;
368 va_start(args, format);
369 vfprintf(stderr, format, args);
370 va_end(args);
371}
372#else
373#define debug_printf printf /* U-Boot debug flag */
374#endif
375#else
376static inline void debug_printf(const char *format, ...) { }
377#endif
378#define final_printf debug_printf
379
380#ifdef __U_BOOT__
381static void syntax_err(void) {
382 printf("syntax error\n");
383}
384#else
385static void __syntax(char *file, int line) {
386 error_msg("syntax error %s:%d", file, line);
387}
388#define syntax() __syntax(__FILE__, __LINE__)
389#endif
390
391#ifdef __U_BOOT__
392static void *xmalloc(size_t size);
393static void *xrealloc(void *ptr, size_t size);
394#else
395/* Index of subroutines: */
396/* function prototypes for builtins */
397static int builtin_cd(struct child_prog *child);
398static int builtin_env(struct child_prog *child);
399static int builtin_eval(struct child_prog *child);
400static int builtin_exec(struct child_prog *child);
401static int builtin_exit(struct child_prog *child);
402static int builtin_export(struct child_prog *child);
403static int builtin_fg_bg(struct child_prog *child);
404static int builtin_help(struct child_prog *child);
405static int builtin_jobs(struct child_prog *child);
406static int builtin_pwd(struct child_prog *child);
407static int builtin_read(struct child_prog *child);
408static int builtin_set(struct child_prog *child);
409static int builtin_shift(struct child_prog *child);
410static int builtin_source(struct child_prog *child);
411static int builtin_umask(struct child_prog *child);
412static int builtin_unset(struct child_prog *child);
413static int builtin_not_written(struct child_prog *child);
414#endif
415/* o_string manipulation: */
416static int b_check_space(o_string *o, int len);
417static int b_addchr(o_string *o, int ch);
418static void b_reset(o_string *o);
419static int b_addqchr(o_string *o, int ch, int quote);
wdenkc26e4542004-04-18 10:13:26 +0000420#ifndef __U_BOOT__
wdenkfe8c2802002-11-03 00:38:21 +0000421static int b_adduint(o_string *o, unsigned int i);
wdenkc26e4542004-04-18 10:13:26 +0000422#endif
wdenkfe8c2802002-11-03 00:38:21 +0000423/* in_str manipulations: */
424static int static_get(struct in_str *i);
425static int static_peek(struct in_str *i);
426static int file_get(struct in_str *i);
427static int file_peek(struct in_str *i);
428#ifndef __U_BOOT__
429static void setup_file_in_str(struct in_str *i, FILE *f);
430#else
431static void setup_file_in_str(struct in_str *i);
432#endif
433static void setup_string_in_str(struct in_str *i, const char *s);
434#ifndef __U_BOOT__
435/* close_me manipulations: */
436static void mark_open(int fd);
437static void mark_closed(int fd);
wdenkd0fb80c2003-01-11 09:48:40 +0000438static void close_all(void);
wdenkfe8c2802002-11-03 00:38:21 +0000439#endif
440/* "run" the final data structures: */
441static char *indenter(int i);
442static int free_pipe_list(struct pipe *head, int indent);
443static int free_pipe(struct pipe *pi, int indent);
444/* really run the final data structures: */
445#ifndef __U_BOOT__
446static int setup_redirects(struct child_prog *prog, int squirrel[]);
447#endif
448static int run_list_real(struct pipe *pi);
449#ifndef __U_BOOT__
450static void pseudo_exec(struct child_prog *child) __attribute__ ((noreturn));
451#endif
452static int run_pipe_real(struct pipe *pi);
453/* extended glob support: */
454#ifndef __U_BOOT__
455static int globhack(const char *src, int flags, glob_t *pglob);
456static int glob_needed(const char *s);
457static int xglob(o_string *dest, int flags, glob_t *pglob);
458#endif
459/* variable assignment: */
460static int is_assignment(const char *s);
461/* data structure manipulation: */
462#ifndef __U_BOOT__
463static int setup_redirect(struct p_context *ctx, int fd, redir_type style, struct in_str *input);
464#endif
465static void initialize_context(struct p_context *ctx);
466static int done_word(o_string *dest, struct p_context *ctx);
467static int done_command(struct p_context *ctx);
468static int done_pipe(struct p_context *ctx, pipe_style type);
469/* primary string parsing: */
470#ifndef __U_BOOT__
471static int redirect_dup_num(struct in_str *input);
472static int redirect_opt_num(o_string *o);
473static int process_command_subs(o_string *dest, struct p_context *ctx, struct in_str *input, int subst_end);
474static int parse_group(o_string *dest, struct p_context *ctx, struct in_str *input, int ch);
475#endif
476static char *lookup_param(char *src);
477static char *make_string(char **inp);
478static int handle_dollar(o_string *dest, struct p_context *ctx, struct in_str *input);
479#ifndef __U_BOOT__
480static int parse_string(o_string *dest, struct p_context *ctx, const char *src);
481#endif
482static int parse_stream(o_string *dest, struct p_context *ctx, struct in_str *input0, int end_trigger);
483/* setup: */
484static int parse_stream_outer(struct in_str *inp, int flag);
485#ifndef __U_BOOT__
486static int parse_string_outer(const char *s, int flag);
487static int parse_file_outer(FILE *f);
488#endif
489#ifndef __U_BOOT__
490/* job management: */
491static int checkjobs(struct pipe* fg_pipe);
492static void insert_bg_job(struct pipe *pi);
493static void remove_bg_job(struct pipe *pi);
494#endif
495/* local variable support */
496static char **make_list_in(char **inp, char *name);
497static char *insert_var_value(char *inp);
498static char *get_local_var(const char *var);
499#ifndef __U_BOOT__
500static void unset_local_var(const char *name);
501#endif
502static int set_local_var(const char *s, int flg_export);
503
504#ifndef __U_BOOT__
505/* Table of built-in functions. They can be forked or not, depending on
506 * context: within pipes, they fork. As simple commands, they do not.
507 * When used in non-forking context, they can change global variables
508 * in the parent shell process. If forked, of course they can not.
509 * For example, 'unset foo | whatever' will parse and run, but foo will
510 * still be set at the end. */
511static struct built_in_command bltins[] = {
512 {"bg", "Resume a job in the background", builtin_fg_bg},
513 {"break", "Exit for, while or until loop", builtin_not_written},
514 {"cd", "Change working directory", builtin_cd},
515 {"continue", "Continue for, while or until loop", builtin_not_written},
516 {"env", "Print all environment variables", builtin_env},
517 {"eval", "Construct and run shell command", builtin_eval},
518 {"exec", "Exec command, replacing this shell with the exec'd process",
519 builtin_exec},
520 {"exit", "Exit from shell()", builtin_exit},
521 {"export", "Set environment variable", builtin_export},
522 {"fg", "Bring job into the foreground", builtin_fg_bg},
523 {"jobs", "Lists the active jobs", builtin_jobs},
524 {"pwd", "Print current directory", builtin_pwd},
525 {"read", "Input environment variable", builtin_read},
526 {"return", "Return from a function", builtin_not_written},
527 {"set", "Set/unset shell local variables", builtin_set},
528 {"shift", "Shift positional parameters", builtin_shift},
529 {"trap", "Trap signals", builtin_not_written},
530 {"ulimit","Controls resource limits", builtin_not_written},
531 {"umask","Sets file creation mask", builtin_umask},
532 {"unset", "Unset environment variable", builtin_unset},
533 {".", "Source-in and run commands in a file", builtin_source},
534 {"help", "List shell built-in commands", builtin_help},
535 {NULL, NULL, NULL}
536};
537
538static const char *set_cwd(void)
539{
540 if(cwd==unknown)
541 cwd = NULL; /* xgetcwd(arg) called free(arg) */
542 cwd = xgetcwd((char *)cwd);
543 if (!cwd)
544 cwd = unknown;
545 return cwd;
546}
547
548/* built-in 'eval' handler */
549static int builtin_eval(struct child_prog *child)
550{
551 char *str = NULL;
552 int rcode = EXIT_SUCCESS;
553
554 if (child->argv[1]) {
555 str = make_string(child->argv + 1);
556 parse_string_outer(str, FLAG_EXIT_FROM_LOOP |
557 FLAG_PARSE_SEMICOLON);
558 free(str);
559 rcode = last_return_code;
560 }
561 return rcode;
562}
563
564/* built-in 'cd <path>' handler */
565static int builtin_cd(struct child_prog *child)
566{
567 char *newdir;
568 if (child->argv[1] == NULL)
569 newdir = getenv("HOME");
570 else
571 newdir = child->argv[1];
572 if (chdir(newdir)) {
573 printf("cd: %s: %s\n", newdir, strerror(errno));
574 return EXIT_FAILURE;
575 }
576 set_cwd();
577 return EXIT_SUCCESS;
578}
579
580/* built-in 'env' handler */
581static int builtin_env(struct child_prog *dummy)
582{
583 char **e = environ;
584 if (e == NULL) return EXIT_FAILURE;
585 for (; *e; e++) {
586 puts(*e);
587 }
588 return EXIT_SUCCESS;
589}
590
591/* built-in 'exec' handler */
592static int builtin_exec(struct child_prog *child)
593{
594 if (child->argv[1] == NULL)
595 return EXIT_SUCCESS; /* Really? */
596 child->argv++;
597 pseudo_exec(child);
598 /* never returns */
599}
600
601/* built-in 'exit' handler */
602static int builtin_exit(struct child_prog *child)
603{
604 if (child->argv[1] == NULL)
605 exit(last_return_code);
606 exit (atoi(child->argv[1]));
607}
608
609/* built-in 'export VAR=value' handler */
610static int builtin_export(struct child_prog *child)
611{
612 int res = 0;
613 char *name = child->argv[1];
614
615 if (name == NULL) {
616 return (builtin_env(child));
617 }
618
619 name = strdup(name);
620
621 if(name) {
622 char *value = strchr(name, '=');
623
624 if (!value) {
625 char *tmp;
626 /* They are exporting something without an =VALUE */
627
628 value = get_local_var(name);
629 if (value) {
630 size_t ln = strlen(name);
631
632 tmp = realloc(name, ln+strlen(value)+2);
633 if(tmp==NULL)
634 res = -1;
635 else {
636 sprintf(tmp+ln, "=%s", value);
637 name = tmp;
638 }
639 } else {
640 /* bash does not return an error when trying to export
641 * an undefined variable. Do likewise. */
642 res = 1;
643 }
644 }
645 }
646 if (res<0)
647 perror_msg("export");
648 else if(res==0)
649 res = set_local_var(name, 1);
650 else
651 res = 0;
652 free(name);
653 return res;
654}
655
656/* built-in 'fg' and 'bg' handler */
657static int builtin_fg_bg(struct child_prog *child)
658{
659 int i, jobnum;
660 struct pipe *pi=NULL;
661
662 if (!interactive)
663 return EXIT_FAILURE;
664 /* If they gave us no args, assume they want the last backgrounded task */
665 if (!child->argv[1]) {
666 for (pi = job_list; pi; pi = pi->next) {
667 if (pi->jobid == last_jobid) {
668 break;
669 }
670 }
671 if (!pi) {
672 error_msg("%s: no current job", child->argv[0]);
673 return EXIT_FAILURE;
674 }
675 } else {
676 if (sscanf(child->argv[1], "%%%d", &jobnum) != 1) {
677 error_msg("%s: bad argument '%s'", child->argv[0], child->argv[1]);
678 return EXIT_FAILURE;
679 }
680 for (pi = job_list; pi; pi = pi->next) {
681 if (pi->jobid == jobnum) {
682 break;
683 }
684 }
685 if (!pi) {
686 error_msg("%s: %d: no such job", child->argv[0], jobnum);
687 return EXIT_FAILURE;
688 }
689 }
690
691 if (*child->argv[0] == 'f') {
692 /* Put the job into the foreground. */
693 tcsetpgrp(shell_terminal, pi->pgrp);
694 }
695
696 /* Restart the processes in the job */
697 for (i = 0; i < pi->num_progs; i++)
698 pi->progs[i].is_stopped = 0;
699
700 if ( (i=kill(- pi->pgrp, SIGCONT)) < 0) {
701 if (i == ESRCH) {
702 remove_bg_job(pi);
703 } else {
704 perror_msg("kill (SIGCONT)");
705 }
706 }
707
708 pi->stopped_progs = 0;
709 return EXIT_SUCCESS;
710}
711
712/* built-in 'help' handler */
713static int builtin_help(struct child_prog *dummy)
714{
715 struct built_in_command *x;
716
717 printf("\nBuilt-in commands:\n");
718 printf("-------------------\n");
719 for (x = bltins; x->cmd; x++) {
720 if (x->descr==NULL)
721 continue;
722 printf("%s\t%s\n", x->cmd, x->descr);
723 }
724 printf("\n\n");
725 return EXIT_SUCCESS;
726}
727
728/* built-in 'jobs' handler */
729static int builtin_jobs(struct child_prog *child)
730{
731 struct pipe *job;
732 char *status_string;
733
734 for (job = job_list; job; job = job->next) {
735 if (job->running_progs == job->stopped_progs)
736 status_string = "Stopped";
737 else
738 status_string = "Running";
739
740 printf(JOB_STATUS_FORMAT, job->jobid, status_string, job->text);
741 }
742 return EXIT_SUCCESS;
743}
744
745
746/* built-in 'pwd' handler */
747static int builtin_pwd(struct child_prog *dummy)
748{
749 puts(set_cwd());
750 return EXIT_SUCCESS;
751}
752
753/* built-in 'read VAR' handler */
754static int builtin_read(struct child_prog *child)
755{
756 int res;
757
758 if (child->argv[1]) {
759 char string[BUFSIZ];
760 char *var = 0;
761
762 string[0] = 0; /* In case stdin has only EOF */
763 /* read string */
764 fgets(string, sizeof(string), stdin);
765 chomp(string);
766 var = malloc(strlen(child->argv[1])+strlen(string)+2);
767 if(var) {
768 sprintf(var, "%s=%s", child->argv[1], string);
769 res = set_local_var(var, 0);
770 } else
771 res = -1;
772 if (res)
773 fprintf(stderr, "read: %m\n");
774 free(var); /* So not move up to avoid breaking errno */
775 return res;
776 } else {
777 do res=getchar(); while(res!='\n' && res!=EOF);
778 return 0;
779 }
780}
781
782/* built-in 'set VAR=value' handler */
783static int builtin_set(struct child_prog *child)
784{
785 char *temp = child->argv[1];
786 struct variables *e;
787
788 if (temp == NULL)
789 for(e = top_vars; e; e=e->next)
790 printf("%s=%s\n", e->name, e->value);
791 else
792 set_local_var(temp, 0);
793
794 return EXIT_SUCCESS;
795}
796
797
798/* Built-in 'shift' handler */
799static int builtin_shift(struct child_prog *child)
800{
801 int n=1;
802 if (child->argv[1]) {
803 n=atoi(child->argv[1]);
804 }
805 if (n>=0 && n<global_argc) {
806 /* XXX This probably breaks $0 */
807 global_argc -= n;
808 global_argv += n;
809 return EXIT_SUCCESS;
810 } else {
811 return EXIT_FAILURE;
812 }
813}
814
815/* Built-in '.' handler (read-in and execute commands from file) */
816static int builtin_source(struct child_prog *child)
817{
818 FILE *input;
819 int status;
820
821 if (child->argv[1] == NULL)
822 return EXIT_FAILURE;
823
824 /* XXX search through $PATH is missing */
825 input = fopen(child->argv[1], "r");
826 if (!input) {
827 error_msg("Couldn't open file '%s'", child->argv[1]);
828 return EXIT_FAILURE;
829 }
830
831 /* Now run the file */
832 /* XXX argv and argc are broken; need to save old global_argv
833 * (pointer only is OK!) on this stack frame,
834 * set global_argv=child->argv+1, recurse, and restore. */
835 mark_open(fileno(input));
836 status = parse_file_outer(input);
837 mark_closed(fileno(input));
838 fclose(input);
839 return (status);
840}
841
842static int builtin_umask(struct child_prog *child)
843{
844 mode_t new_umask;
845 const char *arg = child->argv[1];
846 char *end;
847 if (arg) {
848 new_umask=strtoul(arg, &end, 8);
849 if (*end!='\0' || end == arg) {
850 return EXIT_FAILURE;
851 }
852 } else {
853 printf("%.3o\n", (unsigned int) (new_umask=umask(0)));
854 }
855 umask(new_umask);
856 return EXIT_SUCCESS;
857}
858
859/* built-in 'unset VAR' handler */
860static int builtin_unset(struct child_prog *child)
861{
862 /* bash returned already true */
863 unset_local_var(child->argv[1]);
864 return EXIT_SUCCESS;
865}
866
867static int builtin_not_written(struct child_prog *child)
868{
869 printf("builtin_%s not written\n",child->argv[0]);
870 return EXIT_FAILURE;
871}
872#endif
873
874static int b_check_space(o_string *o, int len)
875{
876 /* It would be easy to drop a more restrictive policy
877 * in here, such as setting a maximum string length */
878 if (o->length + len > o->maxlen) {
879 char *old_data = o->data;
880 /* assert (data == NULL || o->maxlen != 0); */
881 o->maxlen += max(2*len, B_CHUNK);
882 o->data = realloc(o->data, 1 + o->maxlen);
883 if (o->data == NULL) {
884 free(old_data);
885 }
886 }
887 return o->data == NULL;
888}
889
890static int b_addchr(o_string *o, int ch)
891{
892 debug_printf("b_addchr: %c %d %p\n", ch, o->length, o);
893 if (b_check_space(o, 1)) return B_NOSPAC;
894 o->data[o->length] = ch;
895 o->length++;
896 o->data[o->length] = '\0';
897 return 0;
898}
899
900static void b_reset(o_string *o)
901{
902 o->length = 0;
903 o->nonnull = 0;
904 if (o->data != NULL) *o->data = '\0';
905}
906
907static void b_free(o_string *o)
908{
909 b_reset(o);
wdenkd0fb80c2003-01-11 09:48:40 +0000910 free(o->data);
wdenkfe8c2802002-11-03 00:38:21 +0000911 o->data = NULL;
912 o->maxlen = 0;
913}
914
915/* My analysis of quoting semantics tells me that state information
916 * is associated with a destination, not a source.
917 */
918static int b_addqchr(o_string *o, int ch, int quote)
919{
920 if (quote && strchr("*?[\\",ch)) {
921 int rc;
922 rc = b_addchr(o, '\\');
923 if (rc) return rc;
924 }
925 return b_addchr(o, ch);
926}
927
928/* belongs in utility.c */
929char *simple_itoa(unsigned int i)
930{
931 /* 21 digits plus null terminator, good for 64-bit or smaller ints */
932 static char local[22];
933 char *p = &local[21];
934 *p-- = '\0';
935 do {
936 *p-- = '0' + i % 10;
937 i /= 10;
938 } while (i > 0);
939 return p + 1;
940}
941
wdenkc26e4542004-04-18 10:13:26 +0000942#ifndef __U_BOOT__
wdenkfe8c2802002-11-03 00:38:21 +0000943static int b_adduint(o_string *o, unsigned int i)
944{
945 int r;
946 char *p = simple_itoa(i);
947 /* no escape checking necessary */
948 do r=b_addchr(o, *p++); while (r==0 && *p);
949 return r;
950}
wdenkc26e4542004-04-18 10:13:26 +0000951#endif
wdenkfe8c2802002-11-03 00:38:21 +0000952
953static int static_get(struct in_str *i)
954{
955 int ch=*i->p++;
956 if (ch=='\0') return EOF;
957 return ch;
958}
959
960static int static_peek(struct in_str *i)
961{
962 return *i->p;
963}
964
965#ifndef __U_BOOT__
966static inline void cmdedit_set_initial_prompt(void)
967{
wdenkd0fb80c2003-01-11 09:48:40 +0000968#ifndef CONFIG_FEATURE_SH_FANCY_PROMPT
wdenkfe8c2802002-11-03 00:38:21 +0000969 PS1 = NULL;
970#else
971 PS1 = getenv("PS1");
972 if(PS1==0)
973 PS1 = "\\w \\$ ";
974#endif
975}
976
977static inline void setup_prompt_string(int promptmode, char **prompt_str)
978{
979 debug_printf("setup_prompt_string %d ",promptmode);
wdenkd0fb80c2003-01-11 09:48:40 +0000980#ifndef CONFIG_FEATURE_SH_FANCY_PROMPT
wdenkfe8c2802002-11-03 00:38:21 +0000981 /* Set up the prompt */
982 if (promptmode == 1) {
wdenkd0fb80c2003-01-11 09:48:40 +0000983 free(PS1);
wdenkfe8c2802002-11-03 00:38:21 +0000984 PS1=xmalloc(strlen(cwd)+4);
985 sprintf(PS1, "%s %s", cwd, ( geteuid() != 0 ) ? "$ ":"# ");
986 *prompt_str = PS1;
987 } else {
988 *prompt_str = PS2;
989 }
990#else
991 *prompt_str = (promptmode==1)? PS1 : PS2;
992#endif
993 debug_printf("result %s\n",*prompt_str);
994}
995#endif
996
997static void get_user_input(struct in_str *i)
998{
999#ifndef __U_BOOT__
1000 char *prompt_str;
1001 static char the_command[BUFSIZ];
1002
1003 setup_prompt_string(i->promptmode, &prompt_str);
wdenkd0fb80c2003-01-11 09:48:40 +00001004#ifdef CONFIG_FEATURE_COMMAND_EDITING
wdenkfe8c2802002-11-03 00:38:21 +00001005 /*
1006 ** enable command line editing only while a command line
1007 ** is actually being read; otherwise, we'll end up bequeathing
1008 ** atexit() handlers and other unwanted stuff to our
1009 ** child processes (rob@sysgo.de)
1010 */
1011 cmdedit_read_input(prompt_str, the_command);
1012#else
1013 fputs(prompt_str, stdout);
1014 fflush(stdout);
1015 the_command[0]=fgetc(i->file);
1016 the_command[1]='\0';
1017#endif
1018 fflush(stdout);
1019 i->p = the_command;
1020#else
1021 extern char console_buffer[CFG_CBSIZE];
1022 int n;
1023 static char the_command[CFG_CBSIZE];
1024
Wolfgang Denk396387a2005-08-12 23:34:51 +02001025#ifdef CONFIG_BOOT_RETRY_TIME
1026# ifdef CONFIG_RESET_TO_RETRY
1027 extern int do_reset (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]);
1028# else
1029# error "This currently only works with CONFIG_RESET_TO_RETRY enabled"
1030# endif
1031 reset_cmd_timeout();
1032#endif
wdenkfe8c2802002-11-03 00:38:21 +00001033 i->__promptme = 1;
1034 if (i->promptmode == 1) {
1035 n = readline(CFG_PROMPT);
1036 } else {
1037 n = readline(CFG_PROMPT_HUSH_PS2);
1038 }
Wolfgang Denk396387a2005-08-12 23:34:51 +02001039#ifdef CONFIG_BOOT_RETRY_TIME
1040 if (n == -2) {
1041 puts("\nTimeout waiting for command\n");
1042# ifdef CONFIG_RESET_TO_RETRY
1043 do_reset(NULL, 0, 0, NULL);
1044# else
1045# error "This currently only works with CONFIG_RESET_TO_RETRY enabled"
1046# endif
1047 }
1048#endif
wdenkfe8c2802002-11-03 00:38:21 +00001049 if (n == -1 ) {
1050 flag_repeat = 0;
1051 i->__promptme = 0;
1052 }
1053 n = strlen(console_buffer);
1054 console_buffer[n] = '\n';
1055 console_buffer[n+1]= '\0';
1056 if (had_ctrlc()) flag_repeat = 0;
1057 clear_ctrlc();
1058 do_repeat = 0;
1059 if (i->promptmode == 1) {
1060 if (console_buffer[0] == '\n'&& flag_repeat == 0) {
1061 strcpy(the_command,console_buffer);
1062 }
1063 else {
1064 if (console_buffer[0] != '\n') {
1065 strcpy(the_command,console_buffer);
1066 flag_repeat = 1;
1067 }
1068 else {
1069 do_repeat = 1;
1070 }
1071 }
1072 i->p = the_command;
1073 }
1074 else {
wdenk8bde7f72003-06-27 21:31:46 +00001075 if (console_buffer[0] != '\n') {
1076 if (strlen(the_command) + strlen(console_buffer)
wdenkfe8c2802002-11-03 00:38:21 +00001077 < CFG_CBSIZE) {
wdenk8bde7f72003-06-27 21:31:46 +00001078 n = strlen(the_command);
1079 the_command[n-1] = ' ';
1080 strcpy(&the_command[n],console_buffer);
wdenkfe8c2802002-11-03 00:38:21 +00001081 }
1082 else {
1083 the_command[0] = '\n';
1084 the_command[1] = '\0';
1085 flag_repeat = 0;
1086 }
1087 }
1088 if (i->__promptme == 0) {
1089 the_command[0] = '\n';
1090 the_command[1] = '\0';
1091 }
1092 i->p = console_buffer;
1093 }
1094#endif
1095}
1096
1097/* This is the magic location that prints prompts
1098 * and gets data back from the user */
1099static int file_get(struct in_str *i)
1100{
1101 int ch;
1102
1103 ch = 0;
1104 /* If there is data waiting, eat it up */
1105 if (i->p && *i->p) {
1106 ch=*i->p++;
1107 } else {
1108 /* need to double check i->file because we might be doing something
1109 * more complicated by now, like sourcing or substituting. */
1110#ifndef __U_BOOT__
1111 if (i->__promptme && interactive && i->file == stdin) {
1112 while(! i->p || (interactive && strlen(i->p)==0) ) {
1113#else
1114 while(! i->p || strlen(i->p)==0 ) {
1115#endif
1116 get_user_input(i);
1117 }
1118 i->promptmode=2;
1119#ifndef __U_BOOT__
1120 i->__promptme = 0;
1121#endif
1122 if (i->p && *i->p) {
1123 ch=*i->p++;
1124 }
1125#ifndef __U_BOOT__
1126 } else {
1127 ch = fgetc(i->file);
1128 }
1129
1130#endif
1131 debug_printf("b_getch: got a %d\n", ch);
1132 }
1133#ifndef __U_BOOT__
1134 if (ch == '\n') i->__promptme=1;
1135#endif
1136 return ch;
1137}
1138
1139/* All the callers guarantee this routine will never be
1140 * used right after a newline, so prompting is not needed.
1141 */
1142static int file_peek(struct in_str *i)
1143{
1144#ifndef __U_BOOT__
1145 if (i->p && *i->p) {
1146#endif
1147 return *i->p;
1148#ifndef __U_BOOT__
1149 } else {
1150 i->peek_buf[0] = fgetc(i->file);
1151 i->peek_buf[1] = '\0';
1152 i->p = i->peek_buf;
1153 debug_printf("b_peek: got a %d\n", *i->p);
1154 return *i->p;
1155 }
1156#endif
1157}
1158
1159#ifndef __U_BOOT__
1160static void setup_file_in_str(struct in_str *i, FILE *f)
1161#else
1162static void setup_file_in_str(struct in_str *i)
1163#endif
1164{
1165 i->peek = file_peek;
1166 i->get = file_get;
1167 i->__promptme=1;
1168 i->promptmode=1;
1169#ifndef __U_BOOT__
1170 i->file = f;
1171#endif
1172 i->p = NULL;
1173}
1174
1175static void setup_string_in_str(struct in_str *i, const char *s)
1176{
1177 i->peek = static_peek;
1178 i->get = static_get;
1179 i->__promptme=1;
1180 i->promptmode=1;
1181 i->p = s;
1182}
1183
1184#ifndef __U_BOOT__
1185static void mark_open(int fd)
1186{
1187 struct close_me *new = xmalloc(sizeof(struct close_me));
1188 new->fd = fd;
1189 new->next = close_me_head;
1190 close_me_head = new;
1191}
1192
1193static void mark_closed(int fd)
1194{
1195 struct close_me *tmp;
1196 if (close_me_head == NULL || close_me_head->fd != fd)
1197 error_msg_and_die("corrupt close_me");
1198 tmp = close_me_head;
1199 close_me_head = close_me_head->next;
1200 free(tmp);
1201}
1202
wdenkd0fb80c2003-01-11 09:48:40 +00001203static void close_all(void)
wdenkfe8c2802002-11-03 00:38:21 +00001204{
1205 struct close_me *c;
1206 for (c=close_me_head; c; c=c->next) {
1207 close(c->fd);
1208 }
1209 close_me_head = NULL;
1210}
1211
1212/* squirrel != NULL means we squirrel away copies of stdin, stdout,
1213 * and stderr if they are redirected. */
1214static int setup_redirects(struct child_prog *prog, int squirrel[])
1215{
1216 int openfd, mode;
1217 struct redir_struct *redir;
1218
1219 for (redir=prog->redirects; redir; redir=redir->next) {
1220 if (redir->dup == -1 && redir->word.gl_pathv == NULL) {
1221 /* something went wrong in the parse. Pretend it didn't happen */
1222 continue;
1223 }
1224 if (redir->dup == -1) {
1225 mode=redir_table[redir->type].mode;
1226 openfd = open(redir->word.gl_pathv[0], mode, 0666);
1227 if (openfd < 0) {
1228 /* this could get lost if stderr has been redirected, but
1229 bash and ash both lose it as well (though zsh doesn't!) */
1230 perror_msg("error opening %s", redir->word.gl_pathv[0]);
1231 return 1;
1232 }
1233 } else {
1234 openfd = redir->dup;
1235 }
1236
1237 if (openfd != redir->fd) {
1238 if (squirrel && redir->fd < 3) {
1239 squirrel[redir->fd] = dup(redir->fd);
1240 }
1241 if (openfd == -3) {
1242 close(openfd);
1243 } else {
1244 dup2(openfd, redir->fd);
1245 if (redir->dup == -1)
1246 close (openfd);
1247 }
1248 }
1249 }
1250 return 0;
1251}
1252
1253static void restore_redirects(int squirrel[])
1254{
1255 int i, fd;
1256 for (i=0; i<3; i++) {
1257 fd = squirrel[i];
1258 if (fd != -1) {
1259 /* No error checking. I sure wouldn't know what
1260 * to do with an error if I found one! */
1261 dup2(fd, i);
1262 close(fd);
1263 }
1264 }
1265}
1266
1267/* never returns */
1268/* XXX no exit() here. If you don't exec, use _exit instead.
1269 * The at_exit handlers apparently confuse the calling process,
1270 * in particular stdin handling. Not sure why? */
1271static void pseudo_exec(struct child_prog *child)
1272{
1273 int i, rcode;
1274 char *p;
1275 struct built_in_command *x;
1276 if (child->argv) {
1277 for (i=0; is_assignment(child->argv[i]); i++) {
1278 debug_printf("pid %d environment modification: %s\n",getpid(),child->argv[i]);
1279 p = insert_var_value(child->argv[i]);
1280 putenv(strdup(p));
1281 if (p != child->argv[i]) free(p);
1282 }
1283 child->argv+=i; /* XXX this hack isn't so horrible, since we are about
wdenk8bde7f72003-06-27 21:31:46 +00001284 to exit, and therefore don't need to keep data
1285 structures consistent for free() use. */
wdenkfe8c2802002-11-03 00:38:21 +00001286 /* If a variable is assigned in a forest, and nobody listens,
1287 * was it ever really set?
1288 */
1289 if (child->argv[0] == NULL) {
1290 _exit(EXIT_SUCCESS);
1291 }
1292
1293 /*
1294 * Check if the command matches any of the builtins.
1295 * Depending on context, this might be redundant. But it's
1296 * easier to waste a few CPU cycles than it is to figure out
1297 * if this is one of those cases.
1298 */
1299 for (x = bltins; x->cmd; x++) {
1300 if (strcmp(child->argv[0], x->cmd) == 0 ) {
1301 debug_printf("builtin exec %s\n", child->argv[0]);
1302 rcode = x->function(child);
1303 fflush(stdout);
1304 _exit(rcode);
1305 }
1306 }
1307
1308 /* Check if the command matches any busybox internal commands
1309 * ("applets") here.
1310 * FIXME: This feature is not 100% safe, since
1311 * BusyBox is not fully reentrant, so we have no guarantee the things
1312 * from the .bss are still zeroed, or that things from .data are still
1313 * at their defaults. We could exec ourself from /proc/self/exe, but I
1314 * really dislike relying on /proc for things. We could exec ourself
1315 * from global_argv[0], but if we are in a chroot, we may not be able
1316 * to find ourself... */
wdenkd0fb80c2003-01-11 09:48:40 +00001317#ifdef CONFIG_FEATURE_SH_STANDALONE_SHELL
wdenkfe8c2802002-11-03 00:38:21 +00001318 {
1319 int argc_l;
1320 char** argv_l=child->argv;
1321 char *name = child->argv[0];
1322
wdenkd0fb80c2003-01-11 09:48:40 +00001323#ifdef CONFIG_FEATURE_SH_APPLETS_ALWAYS_WIN
wdenkfe8c2802002-11-03 00:38:21 +00001324 /* Following discussions from November 2000 on the busybox mailing
1325 * list, the default configuration, (without
1326 * get_last_path_component()) lets the user force use of an
1327 * external command by specifying the full (with slashes) filename.
wdenkd0fb80c2003-01-11 09:48:40 +00001328 * If you enable CONFIG_FEATURE_SH_APPLETS_ALWAYS_WIN then applets
wdenkfe8c2802002-11-03 00:38:21 +00001329 * _aways_ override external commands, so if you want to run
1330 * /bin/cat, it will use BusyBox cat even if /bin/cat exists on the
1331 * filesystem and is _not_ busybox. Some systems may want this,
1332 * most do not. */
1333 name = get_last_path_component(name);
1334#endif
1335 /* Count argc for use in a second... */
1336 for(argc_l=0;*argv_l!=NULL; argv_l++, argc_l++);
1337 optind = 1;
1338 debug_printf("running applet %s\n", name);
1339 run_applet_by_name(name, argc_l, child->argv);
1340 }
1341#endif
1342 debug_printf("exec of %s\n",child->argv[0]);
1343 execvp(child->argv[0],child->argv);
1344 perror_msg("couldn't exec: %s",child->argv[0]);
1345 _exit(1);
1346 } else if (child->group) {
1347 debug_printf("runtime nesting to group\n");
1348 interactive=0; /* crucial!!!! */
1349 rcode = run_list_real(child->group);
1350 /* OK to leak memory by not calling free_pipe_list,
1351 * since this process is about to exit */
1352 _exit(rcode);
1353 } else {
1354 /* Can happen. See what bash does with ">foo" by itself. */
1355 debug_printf("trying to pseudo_exec null command\n");
1356 _exit(EXIT_SUCCESS);
1357 }
1358}
1359
1360static void insert_bg_job(struct pipe *pi)
1361{
1362 struct pipe *thejob;
1363
1364 /* Linear search for the ID of the job to use */
1365 pi->jobid = 1;
1366 for (thejob = job_list; thejob; thejob = thejob->next)
1367 if (thejob->jobid >= pi->jobid)
1368 pi->jobid = thejob->jobid + 1;
1369
1370 /* add thejob to the list of running jobs */
1371 if (!job_list) {
1372 thejob = job_list = xmalloc(sizeof(*thejob));
1373 } else {
1374 for (thejob = job_list; thejob->next; thejob = thejob->next) /* nothing */;
1375 thejob->next = xmalloc(sizeof(*thejob));
1376 thejob = thejob->next;
1377 }
1378
1379 /* physically copy the struct job */
1380 memcpy(thejob, pi, sizeof(struct pipe));
1381 thejob->next = NULL;
1382 thejob->running_progs = thejob->num_progs;
1383 thejob->stopped_progs = 0;
1384 thejob->text = xmalloc(BUFSIZ); /* cmdedit buffer size */
1385
1386 /*if (pi->progs[0] && pi->progs[0].argv && pi->progs[0].argv[0]) */
1387 {
1388 char *bar=thejob->text;
1389 char **foo=pi->progs[0].argv;
1390 while(foo && *foo) {
1391 bar += sprintf(bar, "%s ", *foo++);
1392 }
1393 }
1394
1395 /* we don't wait for background thejobs to return -- append it
1396 to the list of backgrounded thejobs and leave it alone */
1397 printf("[%d] %d\n", thejob->jobid, thejob->progs[0].pid);
1398 last_bg_pid = thejob->progs[0].pid;
1399 last_jobid = thejob->jobid;
1400}
1401
1402/* remove a backgrounded job */
1403static void remove_bg_job(struct pipe *pi)
1404{
1405 struct pipe *prev_pipe;
1406
1407 if (pi == job_list) {
1408 job_list = pi->next;
1409 } else {
1410 prev_pipe = job_list;
1411 while (prev_pipe->next != pi)
1412 prev_pipe = prev_pipe->next;
1413 prev_pipe->next = pi->next;
1414 }
1415 if (job_list)
1416 last_jobid = job_list->jobid;
1417 else
1418 last_jobid = 0;
1419
1420 pi->stopped_progs = 0;
1421 free_pipe(pi, 0);
1422 free(pi);
1423}
1424
1425/* Checks to see if any processes have exited -- if they
1426 have, figure out why and see if a job has completed */
1427static int checkjobs(struct pipe* fg_pipe)
1428{
1429 int attributes;
1430 int status;
1431 int prognum = 0;
1432 struct pipe *pi;
1433 pid_t childpid;
1434
1435 attributes = WUNTRACED;
1436 if (fg_pipe==NULL) {
1437 attributes |= WNOHANG;
1438 }
1439
1440 while ((childpid = waitpid(-1, &status, attributes)) > 0) {
1441 if (fg_pipe) {
1442 int i, rcode = 0;
1443 for (i=0; i < fg_pipe->num_progs; i++) {
1444 if (fg_pipe->progs[i].pid == childpid) {
1445 if (i==fg_pipe->num_progs-1)
1446 rcode=WEXITSTATUS(status);
1447 (fg_pipe->num_progs)--;
1448 return(rcode);
1449 }
1450 }
1451 }
1452
1453 for (pi = job_list; pi; pi = pi->next) {
1454 prognum = 0;
1455 while (prognum < pi->num_progs && pi->progs[prognum].pid != childpid) {
1456 prognum++;
1457 }
1458 if (prognum < pi->num_progs)
1459 break;
1460 }
1461
1462 if(pi==NULL) {
1463 debug_printf("checkjobs: pid %d was not in our list!\n", childpid);
1464 continue;
1465 }
1466
1467 if (WIFEXITED(status) || WIFSIGNALED(status)) {
1468 /* child exited */
1469 pi->running_progs--;
1470 pi->progs[prognum].pid = 0;
1471
1472 if (!pi->running_progs) {
1473 printf(JOB_STATUS_FORMAT, pi->jobid, "Done", pi->text);
1474 remove_bg_job(pi);
1475 }
1476 } else {
1477 /* child stopped */
1478 pi->stopped_progs++;
1479 pi->progs[prognum].is_stopped = 1;
1480
1481#if 0
1482 /* Printing this stuff is a pain, since it tends to
1483 * overwrite the prompt an inconveinient moments. So
1484 * don't do that. */
1485 if (pi->stopped_progs == pi->num_progs) {
1486 printf("\n"JOB_STATUS_FORMAT, pi->jobid, "Stopped", pi->text);
1487 }
1488#endif
1489 }
1490 }
1491
1492 if (childpid == -1 && errno != ECHILD)
1493 perror_msg("waitpid");
1494
1495 /* move the shell to the foreground */
1496 /*if (interactive && tcsetpgrp(shell_terminal, getpgid(0))) */
1497 /* perror_msg("tcsetpgrp-2"); */
1498 return -1;
1499}
1500
1501/* Figure out our controlling tty, checking in order stderr,
1502 * stdin, and stdout. If check_pgrp is set, also check that
1503 * we belong to the foreground process group associated with
1504 * that tty. The value of shell_terminal is needed in order to call
1505 * tcsetpgrp(shell_terminal, ...); */
1506void controlling_tty(int check_pgrp)
1507{
1508 pid_t curpgrp;
1509
1510 if ((curpgrp = tcgetpgrp(shell_terminal = 2)) < 0
1511 && (curpgrp = tcgetpgrp(shell_terminal = 0)) < 0
1512 && (curpgrp = tcgetpgrp(shell_terminal = 1)) < 0)
1513 goto shell_terminal_error;
1514
1515 if (check_pgrp && curpgrp != getpgid(0))
1516 goto shell_terminal_error;
1517
1518 return;
1519
1520shell_terminal_error:
1521 shell_terminal = -1;
1522 return;
1523}
1524#endif
1525
1526/* run_pipe_real() starts all the jobs, but doesn't wait for anything
1527 * to finish. See checkjobs().
1528 *
1529 * return code is normally -1, when the caller has to wait for children
1530 * to finish to determine the exit status of the pipe. If the pipe
1531 * is a simple builtin command, however, the action is done by the
1532 * time run_pipe_real returns, and the exit code is provided as the
1533 * return value.
1534 *
1535 * The input of the pipe is always stdin, the output is always
1536 * stdout. The outpipe[] mechanism in BusyBox-0.48 lash is bogus,
1537 * because it tries to avoid running the command substitution in
1538 * subshell, when that is in fact necessary. The subshell process
1539 * now has its stdout directed to the input of the appropriate pipe,
1540 * so this routine is noticeably simpler.
1541 */
1542static int run_pipe_real(struct pipe *pi)
1543{
1544 int i;
1545#ifndef __U_BOOT__
1546 int nextin, nextout;
1547 int pipefds[2]; /* pipefds[0] is for reading */
1548 struct child_prog *child;
1549 struct built_in_command *x;
1550 char *p;
wdenkd0fb80c2003-01-11 09:48:40 +00001551# if __GNUC__
1552 /* Avoid longjmp clobbering */
1553 (void) &i;
1554 (void) &nextin;
1555 (void) &nextout;
1556 (void) &child;
1557# endif
wdenkfe8c2802002-11-03 00:38:21 +00001558#else
1559 int nextin;
1560 int flag = do_repeat ? CMD_FLAG_REPEAT : 0;
1561 struct child_prog *child;
1562 cmd_tbl_t *cmdtp;
1563 char *p;
wdenkd0fb80c2003-01-11 09:48:40 +00001564# if __GNUC__
1565 /* Avoid longjmp clobbering */
1566 (void) &i;
1567 (void) &nextin;
1568 (void) &child;
1569# endif
1570#endif /* __U_BOOT__ */
wdenkfe8c2802002-11-03 00:38:21 +00001571
1572 nextin = 0;
1573#ifndef __U_BOOT__
1574 pi->pgrp = -1;
1575#endif
1576
1577 /* Check if this is a simple builtin (not part of a pipe).
1578 * Builtins within pipes have to fork anyway, and are handled in
1579 * pseudo_exec. "echo foo | read bar" doesn't work on bash, either.
1580 */
1581 if (pi->num_progs == 1) child = & (pi->progs[0]);
1582#ifndef __U_BOOT__
1583 if (pi->num_progs == 1 && child->group && child->subshell == 0) {
1584 int squirrel[] = {-1, -1, -1};
1585 int rcode;
1586 debug_printf("non-subshell grouping\n");
1587 setup_redirects(child, squirrel);
1588 /* XXX could we merge code with following builtin case,
1589 * by creating a pseudo builtin that calls run_list_real? */
1590 rcode = run_list_real(child->group);
1591 restore_redirects(squirrel);
1592#else
1593 if (pi->num_progs == 1 && child->group) {
1594 int rcode;
1595 debug_printf("non-subshell grouping\n");
1596 rcode = run_list_real(child->group);
1597#endif
1598 return rcode;
1599 } else if (pi->num_progs == 1 && pi->progs[0].argv != NULL) {
1600 for (i=0; is_assignment(child->argv[i]); i++) { /* nothing */ }
1601 if (i!=0 && child->argv[i]==NULL) {
1602 /* assignments, but no command: set the local environment */
1603 for (i=0; child->argv[i]!=NULL; i++) {
1604
1605 /* Ok, this case is tricky. We have to decide if this is a
1606 * local variable, or an already exported variable. If it is
1607 * already exported, we have to export the new value. If it is
1608 * not exported, we need only set this as a local variable.
1609 * This junk is all to decide whether or not to export this
1610 * variable. */
1611 int export_me=0;
1612 char *name, *value;
1613 name = xstrdup(child->argv[i]);
1614 debug_printf("Local environment set: %s\n", name);
1615 value = strchr(name, '=');
1616 if (value)
1617 *value=0;
1618#ifndef __U_BOOT__
1619 if ( get_local_var(name)) {
1620 export_me=1;
1621 }
1622#endif
1623 free(name);
1624 p = insert_var_value(child->argv[i]);
1625 set_local_var(p, export_me);
1626 if (p != child->argv[i]) free(p);
1627 }
1628 return EXIT_SUCCESS; /* don't worry about errors in set_local_var() yet */
1629 }
1630 for (i = 0; is_assignment(child->argv[i]); i++) {
1631 p = insert_var_value(child->argv[i]);
1632#ifndef __U_BOOT__
1633 putenv(strdup(p));
1634#else
1635 set_local_var(p, 0);
1636#endif
1637 if (p != child->argv[i]) {
1638 child->sp--;
1639 free(p);
1640 }
1641 }
1642 if (child->sp) {
1643 char * str = NULL;
1644
1645 str = make_string((child->argv + i));
1646 parse_string_outer(str, FLAG_EXIT_FROM_LOOP | FLAG_REPARSING);
1647 free(str);
1648 return last_return_code;
1649 }
1650#ifndef __U_BOOT__
1651 for (x = bltins; x->cmd; x++) {
1652 if (strcmp(child->argv[i], x->cmd) == 0 ) {
1653 int squirrel[] = {-1, -1, -1};
1654 int rcode;
1655 if (x->function == builtin_exec && child->argv[i+1]==NULL) {
1656 debug_printf("magic exec\n");
1657 setup_redirects(child,NULL);
1658 return EXIT_SUCCESS;
1659 }
1660 debug_printf("builtin inline %s\n", child->argv[0]);
1661 /* XXX setup_redirects acts on file descriptors, not FILEs.
1662 * This is perfect for work that comes after exec().
1663 * Is it really safe for inline use? Experimentally,
1664 * things seem to work with glibc. */
1665 setup_redirects(child, squirrel);
1666#else
1667 /* check ";", because ,example , argv consist from
1668 * "help;flinfo" must not execute
1669 */
1670 if (strchr(child->argv[i], ';')) {
1671 printf ("Unknown command '%s' - try 'help' or use 'run' command\n",
1672 child->argv[i]);
1673 return -1;
1674 }
wdenk8bde7f72003-06-27 21:31:46 +00001675 /* Look up command in command table */
1676
1677
wdenkfe8c2802002-11-03 00:38:21 +00001678 if ((cmdtp = find_cmd(child->argv[i])) == NULL) {
1679 printf ("Unknown command '%s' - try 'help'\n", child->argv[i]);
1680 return -1; /* give up after bad command */
1681 } else {
1682 int rcode;
1683#if (CONFIG_COMMANDS & CFG_CMD_BOOTD)
wdenk8bde7f72003-06-27 21:31:46 +00001684 extern int do_bootd (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]);
1685
1686 /* avoid "bootd" recursion */
wdenkfe8c2802002-11-03 00:38:21 +00001687 if (cmdtp->cmd == do_bootd) {
1688 if (flag & CMD_FLAG_BOOTD) {
1689 printf ("'bootd' recursion detected\n");
1690 return -1;
1691 }
1692 else
1693 flag |= CMD_FLAG_BOOTD;
1694 }
1695#endif /* CFG_CMD_BOOTD */
wdenk8bde7f72003-06-27 21:31:46 +00001696 /* found - check max args */
wdenkfe8c2802002-11-03 00:38:21 +00001697 if ((child->argc - i) > cmdtp->maxargs) {
1698 printf ("Usage:\n%s\n", cmdtp->usage);
1699 return -1;
1700 }
1701#endif
1702 child->argv+=i; /* XXX horrible hack */
1703#ifndef __U_BOOT__
1704 rcode = x->function(child);
1705#else
1706 /* OK - call function to do the command */
wdenk8bde7f72003-06-27 21:31:46 +00001707
wdenkfe8c2802002-11-03 00:38:21 +00001708 rcode = (cmdtp->cmd)
wdenk8bde7f72003-06-27 21:31:46 +00001709(cmdtp, flag,child->argc-i,&child->argv[i]);
wdenkfe8c2802002-11-03 00:38:21 +00001710 if ( !cmdtp->repeatable )
1711 flag_repeat = 0;
wdenk8bde7f72003-06-27 21:31:46 +00001712
1713
wdenkfe8c2802002-11-03 00:38:21 +00001714#endif
1715 child->argv-=i; /* XXX restore hack so free() can work right */
1716#ifndef __U_BOOT__
wdenk8bde7f72003-06-27 21:31:46 +00001717
wdenkfe8c2802002-11-03 00:38:21 +00001718 restore_redirects(squirrel);
1719#endif
wdenk8bde7f72003-06-27 21:31:46 +00001720
wdenkfe8c2802002-11-03 00:38:21 +00001721 return rcode;
1722 }
1723 }
1724#ifndef __U_BOOT__
1725 }
1726
1727 for (i = 0; i < pi->num_progs; i++) {
1728 child = & (pi->progs[i]);
1729
1730 /* pipes are inserted between pairs of commands */
1731 if ((i + 1) < pi->num_progs) {
1732 if (pipe(pipefds)<0) perror_msg_and_die("pipe");
1733 nextout = pipefds[1];
1734 } else {
1735 nextout=1;
1736 pipefds[0] = -1;
1737 }
1738
1739 /* XXX test for failed fork()? */
1740 if (!(child->pid = fork())) {
1741 /* Set the handling for job control signals back to the default. */
1742 signal(SIGINT, SIG_DFL);
1743 signal(SIGQUIT, SIG_DFL);
1744 signal(SIGTERM, SIG_DFL);
1745 signal(SIGTSTP, SIG_DFL);
1746 signal(SIGTTIN, SIG_DFL);
1747 signal(SIGTTOU, SIG_DFL);
1748 signal(SIGCHLD, SIG_DFL);
1749
1750 close_all();
1751
1752 if (nextin != 0) {
1753 dup2(nextin, 0);
1754 close(nextin);
1755 }
1756 if (nextout != 1) {
1757 dup2(nextout, 1);
1758 close(nextout);
1759 }
1760 if (pipefds[0]!=-1) {
1761 close(pipefds[0]); /* opposite end of our output pipe */
1762 }
1763
1764 /* Like bash, explicit redirects override pipes,
1765 * and the pipe fd is available for dup'ing. */
1766 setup_redirects(child,NULL);
1767
1768 if (interactive && pi->followup!=PIPE_BG) {
1769 /* If we (the child) win the race, put ourselves in the process
1770 * group whose leader is the first process in this pipe. */
1771 if (pi->pgrp < 0) {
1772 pi->pgrp = getpid();
1773 }
1774 if (setpgid(0, pi->pgrp) == 0) {
1775 tcsetpgrp(2, pi->pgrp);
1776 }
1777 }
1778
1779 pseudo_exec(child);
1780 }
1781
1782
1783 /* put our child in the process group whose leader is the
1784 first process in this pipe */
1785 if (pi->pgrp < 0) {
1786 pi->pgrp = child->pid;
1787 }
1788 /* Don't check for errors. The child may be dead already,
1789 * in which case setpgid returns error code EACCES. */
1790 setpgid(child->pid, pi->pgrp);
1791
1792 if (nextin != 0)
1793 close(nextin);
1794 if (nextout != 1)
1795 close(nextout);
1796
1797 /* If there isn't another process, nextin is garbage
1798 but it doesn't matter */
1799 nextin = pipefds[0];
1800 }
1801#endif
1802 return -1;
1803}
1804
1805static int run_list_real(struct pipe *pi)
1806{
1807 char *save_name = NULL;
1808 char **list = NULL;
1809 char **save_list = NULL;
1810 struct pipe *rpipe;
1811 int flag_rep = 0;
1812#ifndef __U_BOOT__
1813 int save_num_progs;
1814#endif
1815 int rcode=0, flag_skip=1;
1816 int flag_restore = 0;
1817 int if_code=0, next_if_code=0; /* need double-buffer to handle elif */
1818 reserved_style rmode, skip_more_in_this_rmode=RES_XXXX;
1819 /* check syntax for "for" */
1820 for (rpipe = pi; rpipe; rpipe = rpipe->next) {
1821 if ((rpipe->r_mode == RES_IN ||
1822 rpipe->r_mode == RES_FOR) &&
1823 (rpipe->next == NULL)) {
1824 syntax();
1825#ifdef __U_BOOT__
1826 flag_repeat = 0;
1827#endif
1828 return 1;
1829 }
1830 if ((rpipe->r_mode == RES_IN &&
1831 (rpipe->next->r_mode == RES_IN &&
1832 rpipe->next->progs->argv != NULL))||
1833 (rpipe->r_mode == RES_FOR &&
1834 rpipe->next->r_mode != RES_IN)) {
1835 syntax();
1836#ifdef __U_BOOT__
1837 flag_repeat = 0;
1838#endif
1839 return 1;
1840 }
1841 }
1842 for (; pi; pi = (flag_restore != 0) ? rpipe : pi->next) {
1843 if (pi->r_mode == RES_WHILE || pi->r_mode == RES_UNTIL ||
1844 pi->r_mode == RES_FOR) {
1845#ifdef __U_BOOT__
1846 /* check Ctrl-C */
1847 ctrlc();
1848 if ((had_ctrlc())) {
1849 return 1;
1850 }
1851#endif
1852 flag_restore = 0;
1853 if (!rpipe) {
1854 flag_rep = 0;
1855 rpipe = pi;
1856 }
1857 }
1858 rmode = pi->r_mode;
1859 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);
1860 if (rmode == skip_more_in_this_rmode && flag_skip) {
1861 if (pi->followup == PIPE_SEQ) flag_skip=0;
1862 continue;
1863 }
1864 flag_skip = 1;
1865 skip_more_in_this_rmode = RES_XXXX;
1866 if (rmode == RES_THEN || rmode == RES_ELSE) if_code = next_if_code;
1867 if (rmode == RES_THEN && if_code) continue;
1868 if (rmode == RES_ELSE && !if_code) continue;
wdenk56b86bf2004-04-12 14:31:43 +00001869 if (rmode == RES_ELIF && !if_code) break;
wdenkfe8c2802002-11-03 00:38:21 +00001870 if (rmode == RES_FOR && pi->num_progs) {
1871 if (!list) {
1872 /* if no variable values after "in" we skip "for" */
1873 if (!pi->next->progs->argv) continue;
1874 /* create list of variable values */
1875 list = make_list_in(pi->next->progs->argv,
1876 pi->progs->argv[0]);
1877 save_list = list;
1878 save_name = pi->progs->argv[0];
1879 pi->progs->argv[0] = NULL;
1880 flag_rep = 1;
1881 }
1882 if (!(*list)) {
1883 free(pi->progs->argv[0]);
1884 free(save_list);
1885 list = NULL;
1886 flag_rep = 0;
1887 pi->progs->argv[0] = save_name;
1888#ifndef __U_BOOT__
1889 pi->progs->glob_result.gl_pathv[0] =
1890 pi->progs->argv[0];
1891#endif
1892 continue;
1893 } else {
1894 /* insert new value from list for variable */
1895 if (pi->progs->argv[0])
1896 free(pi->progs->argv[0]);
1897 pi->progs->argv[0] = *list++;
1898#ifndef __U_BOOT__
1899 pi->progs->glob_result.gl_pathv[0] =
1900 pi->progs->argv[0];
1901#endif
1902 }
1903 }
1904 if (rmode == RES_IN) continue;
1905 if (rmode == RES_DO) {
1906 if (!flag_rep) continue;
1907 }
1908 if ((rmode == RES_DONE)) {
1909 if (flag_rep) {
1910 flag_restore = 1;
1911 } else {
1912 rpipe = NULL;
1913 }
1914 }
1915 if (pi->num_progs == 0) continue;
1916#ifndef __U_BOOT__
1917 save_num_progs = pi->num_progs; /* save number of programs */
1918#endif
1919 rcode = run_pipe_real(pi);
1920 debug_printf("run_pipe_real returned %d\n",rcode);
1921#ifndef __U_BOOT__
1922 if (rcode!=-1) {
1923 /* We only ran a builtin: rcode was set by the return value
1924 * of run_pipe_real(), and we don't need to wait for anything. */
1925 } else if (pi->followup==PIPE_BG) {
1926 /* XXX check bash's behavior with nontrivial pipes */
1927 /* XXX compute jobid */
1928 /* XXX what does bash do with attempts to background builtins? */
1929 insert_bg_job(pi);
1930 rcode = EXIT_SUCCESS;
1931 } else {
1932 if (interactive) {
1933 /* move the new process group into the foreground */
1934 if (tcsetpgrp(shell_terminal, pi->pgrp) && errno != ENOTTY)
1935 perror_msg("tcsetpgrp-3");
1936 rcode = checkjobs(pi);
1937 /* move the shell to the foreground */
1938 if (tcsetpgrp(shell_terminal, getpgid(0)) && errno != ENOTTY)
1939 perror_msg("tcsetpgrp-4");
1940 } else {
1941 rcode = checkjobs(pi);
1942 }
1943 debug_printf("checkjobs returned %d\n",rcode);
1944 }
1945 last_return_code=rcode;
1946#else
wdenkc26e4542004-04-18 10:13:26 +00001947 if (rcode < -1) {
1948 last_return_code = -rcode - 2;
1949 return -2; /* exit */
1950 }
wdenkfe8c2802002-11-03 00:38:21 +00001951 last_return_code=(rcode == 0) ? 0 : 1;
1952#endif
1953#ifndef __U_BOOT__
1954 pi->num_progs = save_num_progs; /* restore number of programs */
1955#endif
1956 if ( rmode == RES_IF || rmode == RES_ELIF )
1957 next_if_code=rcode; /* can be overwritten a number of times */
1958 if (rmode == RES_WHILE)
1959 flag_rep = !last_return_code;
1960 if (rmode == RES_UNTIL)
1961 flag_rep = last_return_code;
1962 if ( (rcode==EXIT_SUCCESS && pi->followup==PIPE_OR) ||
1963 (rcode!=EXIT_SUCCESS && pi->followup==PIPE_AND) )
1964 skip_more_in_this_rmode=rmode;
1965#ifndef __U_BOOT__
1966 checkjobs(NULL);
1967#endif
1968 }
1969 return rcode;
1970}
1971
1972/* broken, of course, but OK for testing */
1973static char *indenter(int i)
1974{
1975 static char blanks[]=" ";
1976 return &blanks[sizeof(blanks)-i-1];
1977}
1978
1979/* return code is the exit status of the pipe */
1980static int free_pipe(struct pipe *pi, int indent)
1981{
1982 char **p;
1983 struct child_prog *child;
1984#ifndef __U_BOOT__
1985 struct redir_struct *r, *rnext;
1986#endif
1987 int a, i, ret_code=0;
1988 char *ind = indenter(indent);
1989
1990#ifndef __U_BOOT__
1991 if (pi->stopped_progs > 0)
1992 return ret_code;
1993 final_printf("%s run pipe: (pid %d)\n",ind,getpid());
1994#endif
1995 for (i=0; i<pi->num_progs; i++) {
1996 child = &pi->progs[i];
1997 final_printf("%s command %d:\n",ind,i);
1998 if (child->argv) {
1999 for (a=0,p=child->argv; *p; a++,p++) {
2000 final_printf("%s argv[%d] = %s\n",ind,a,*p);
2001 }
2002#ifndef __U_BOOT__
2003 globfree(&child->glob_result);
2004#else
wdenk8bde7f72003-06-27 21:31:46 +00002005 for (a = child->argc;a >= 0;a--) {
2006 free(child->argv[a]);
2007 }
wdenkfe8c2802002-11-03 00:38:21 +00002008 free(child->argv);
wdenk8bde7f72003-06-27 21:31:46 +00002009 child->argc = 0;
wdenkfe8c2802002-11-03 00:38:21 +00002010#endif
2011 child->argv=NULL;
2012 } else if (child->group) {
2013#ifndef __U_BOOT__
2014 final_printf("%s begin group (subshell:%d)\n",ind, child->subshell);
2015#endif
2016 ret_code = free_pipe_list(child->group,indent+3);
2017 final_printf("%s end group\n",ind);
2018 } else {
2019 final_printf("%s (nil)\n",ind);
2020 }
2021#ifndef __U_BOOT__
2022 for (r=child->redirects; r; r=rnext) {
2023 final_printf("%s redirect %d%s", ind, r->fd, redir_table[r->type].descrip);
2024 if (r->dup == -1) {
2025 /* guard against the case >$FOO, where foo is unset or blank */
2026 if (r->word.gl_pathv) {
2027 final_printf(" %s\n", *r->word.gl_pathv);
2028 globfree(&r->word);
2029 }
2030 } else {
2031 final_printf("&%d\n", r->dup);
2032 }
2033 rnext=r->next;
2034 free(r);
2035 }
2036 child->redirects=NULL;
2037#endif
2038 }
2039 free(pi->progs); /* children are an array, they get freed all at once */
2040 pi->progs=NULL;
2041 return ret_code;
2042}
2043
2044static int free_pipe_list(struct pipe *head, int indent)
2045{
2046 int rcode=0; /* if list has no members */
2047 struct pipe *pi, *next;
2048 char *ind = indenter(indent);
2049 for (pi=head; pi; pi=next) {
2050 final_printf("%s pipe reserved mode %d\n", ind, pi->r_mode);
2051 rcode = free_pipe(pi, indent);
2052 final_printf("%s pipe followup code %d\n", ind, pi->followup);
2053 next=pi->next;
2054 pi->next=NULL;
2055 free(pi);
2056 }
2057 return rcode;
2058}
2059
2060/* Select which version we will use */
2061static int run_list(struct pipe *pi)
2062{
2063 int rcode=0;
2064#ifndef __U_BOOT__
2065 if (fake_mode==0) {
2066#endif
2067 rcode = run_list_real(pi);
2068#ifndef __U_BOOT__
2069 }
2070#endif
2071 /* free_pipe_list has the side effect of clearing memory
2072 * In the long run that function can be merged with run_list_real,
2073 * but doing that now would hobble the debugging effort. */
2074 free_pipe_list(pi,0);
2075 return rcode;
2076}
2077
2078/* The API for glob is arguably broken. This routine pushes a non-matching
2079 * string into the output structure, removing non-backslashed backslashes.
2080 * If someone can prove me wrong, by performing this function within the
2081 * original glob(3) api, feel free to rewrite this routine into oblivion.
2082 * Return code (0 vs. GLOB_NOSPACE) matches glob(3).
2083 * XXX broken if the last character is '\\', check that before calling.
2084 */
2085#ifndef __U_BOOT__
2086static int globhack(const char *src, int flags, glob_t *pglob)
2087{
2088 int cnt=0, pathc;
2089 const char *s;
2090 char *dest;
2091 for (cnt=1, s=src; s && *s; s++) {
2092 if (*s == '\\') s++;
2093 cnt++;
2094 }
2095 dest = malloc(cnt);
2096 if (!dest) return GLOB_NOSPACE;
2097 if (!(flags & GLOB_APPEND)) {
2098 pglob->gl_pathv=NULL;
2099 pglob->gl_pathc=0;
2100 pglob->gl_offs=0;
2101 pglob->gl_offs=0;
2102 }
2103 pathc = ++pglob->gl_pathc;
2104 pglob->gl_pathv = realloc(pglob->gl_pathv, (pathc+1)*sizeof(*pglob->gl_pathv));
2105 if (pglob->gl_pathv == NULL) return GLOB_NOSPACE;
2106 pglob->gl_pathv[pathc-1]=dest;
2107 pglob->gl_pathv[pathc]=NULL;
2108 for (s=src; s && *s; s++, dest++) {
2109 if (*s == '\\') s++;
2110 *dest = *s;
2111 }
2112 *dest='\0';
2113 return 0;
2114}
2115
2116/* XXX broken if the last character is '\\', check that before calling */
2117static int glob_needed(const char *s)
2118{
2119 for (; *s; s++) {
2120 if (*s == '\\') s++;
2121 if (strchr("*[?",*s)) return 1;
2122 }
2123 return 0;
2124}
2125
2126#if 0
2127static void globprint(glob_t *pglob)
2128{
2129 int i;
2130 debug_printf("glob_t at %p:\n", pglob);
2131 debug_printf(" gl_pathc=%d gl_pathv=%p gl_offs=%d gl_flags=%d\n",
2132 pglob->gl_pathc, pglob->gl_pathv, pglob->gl_offs, pglob->gl_flags);
2133 for (i=0; i<pglob->gl_pathc; i++)
2134 debug_printf("pglob->gl_pathv[%d] = %p = %s\n", i,
2135 pglob->gl_pathv[i], pglob->gl_pathv[i]);
2136}
2137#endif
2138
2139static int xglob(o_string *dest, int flags, glob_t *pglob)
2140{
2141 int gr;
2142
wdenk8bde7f72003-06-27 21:31:46 +00002143 /* short-circuit for null word */
wdenkfe8c2802002-11-03 00:38:21 +00002144 /* we can code this better when the debug_printf's are gone */
wdenk8bde7f72003-06-27 21:31:46 +00002145 if (dest->length == 0) {
2146 if (dest->nonnull) {
2147 /* bash man page calls this an "explicit" null */
2148 gr = globhack(dest->data, flags, pglob);
2149 debug_printf("globhack returned %d\n",gr);
2150 } else {
wdenkfe8c2802002-11-03 00:38:21 +00002151 return 0;
2152 }
wdenk8bde7f72003-06-27 21:31:46 +00002153 } else if (glob_needed(dest->data)) {
wdenkfe8c2802002-11-03 00:38:21 +00002154 gr = glob(dest->data, flags, NULL, pglob);
2155 debug_printf("glob returned %d\n",gr);
2156 if (gr == GLOB_NOMATCH) {
2157 /* quote removal, or more accurately, backslash removal */
2158 gr = globhack(dest->data, flags, pglob);
2159 debug_printf("globhack returned %d\n",gr);
2160 }
2161 } else {
2162 gr = globhack(dest->data, flags, pglob);
2163 debug_printf("globhack returned %d\n",gr);
2164 }
2165 if (gr == GLOB_NOSPACE)
2166 error_msg_and_die("out of memory during glob");
2167 if (gr != 0) { /* GLOB_ABORTED ? */
2168 error_msg("glob(3) error %d",gr);
2169 }
2170 /* globprint(glob_target); */
2171 return gr;
2172}
2173#endif
2174
wdenkc26e4542004-04-18 10:13:26 +00002175#ifdef __U_BOOT__
2176static char *get_dollar_var(char ch);
2177#endif
2178
wdenkfe8c2802002-11-03 00:38:21 +00002179/* This is used to get/check local shell variables */
2180static char *get_local_var(const char *s)
2181{
2182 struct variables *cur;
2183
2184 if (!s)
2185 return NULL;
wdenkc26e4542004-04-18 10:13:26 +00002186
2187#ifdef __U_BOOT__
2188 if (*s == '$')
2189 return get_dollar_var(s[1]);
2190#endif
2191
wdenkfe8c2802002-11-03 00:38:21 +00002192 for (cur = top_vars; cur; cur=cur->next)
2193 if(strcmp(cur->name, s)==0)
2194 return cur->value;
2195 return NULL;
2196}
2197
2198/* This is used to set local shell variables
2199 flg_export==0 if only local (not exporting) variable
2200 flg_export==1 if "new" exporting environ
2201 flg_export>1 if current startup environ (not call putenv()) */
2202static int set_local_var(const char *s, int flg_export)
2203{
2204 char *name, *value;
2205 int result=0;
2206 struct variables *cur;
2207
wdenkc26e4542004-04-18 10:13:26 +00002208#ifdef __U_BOOT__
2209 /* might be possible! */
2210 if (!isalpha(*s))
2211 return -1;
2212#endif
2213
wdenkfe8c2802002-11-03 00:38:21 +00002214 name=strdup(s);
2215
2216#ifdef __U_BOOT__
2217 if (getenv(name) != NULL) {
2218 printf ("ERROR: "
wdenk2d1a5372004-02-23 19:30:57 +00002219 "There is a global environment variable with the same name.\n");
wdenkc26e4542004-04-18 10:13:26 +00002220 free(name);
wdenkfe8c2802002-11-03 00:38:21 +00002221 return -1;
2222 }
2223#endif
2224 /* Assume when we enter this function that we are already in
2225 * NAME=VALUE format. So the first order of business is to
2226 * split 's' on the '=' into 'name' and 'value' */
2227 value = strchr(name, '=');
2228 if (value==0 && ++value==0) {
2229 free(name);
2230 return -1;
2231 }
2232 *value++ = 0;
2233
2234 for(cur = top_vars; cur; cur = cur->next) {
2235 if(strcmp(cur->name, name)==0)
2236 break;
2237 }
2238
2239 if(cur) {
2240 if(strcmp(cur->value, value)==0) {
2241 if(flg_export>0 && cur->flg_export==0)
2242 cur->flg_export=flg_export;
2243 else
2244 result++;
2245 } else {
2246 if(cur->flg_read_only) {
2247 error_msg("%s: readonly variable", name);
2248 result = -1;
2249 } else {
2250 if(flg_export>0 || cur->flg_export>1)
2251 cur->flg_export=1;
2252 free(cur->value);
2253
2254 cur->value = strdup(value);
2255 }
2256 }
2257 } else {
2258 cur = malloc(sizeof(struct variables));
2259 if(!cur) {
2260 result = -1;
2261 } else {
2262 cur->name = strdup(name);
2263 if(cur->name == 0) {
2264 free(cur);
2265 result = -1;
2266 } else {
2267 struct variables *bottom = top_vars;
2268 cur->value = strdup(value);
2269 cur->next = 0;
2270 cur->flg_export = flg_export;
2271 cur->flg_read_only = 0;
2272 while(bottom->next) bottom=bottom->next;
2273 bottom->next = cur;
2274 }
2275 }
2276 }
2277
2278#ifndef __U_BOOT__
2279 if(result==0 && cur->flg_export==1) {
2280 *(value-1) = '=';
2281 result = putenv(name);
2282 } else {
2283#endif
2284 free(name);
2285#ifndef __U_BOOT__
2286 if(result>0) /* equivalent to previous set */
2287 result = 0;
2288 }
2289#endif
2290 return result;
2291}
2292
2293#ifndef __U_BOOT__
2294static void unset_local_var(const char *name)
2295{
2296 struct variables *cur;
2297
2298 if (name) {
2299 for (cur = top_vars; cur; cur=cur->next) {
2300 if(strcmp(cur->name, name)==0)
2301 break;
2302 }
2303 if(cur!=0) {
2304 struct variables *next = top_vars;
2305 if(cur->flg_read_only) {
2306 error_msg("%s: readonly variable", name);
2307 return;
2308 } else {
2309 if(cur->flg_export)
2310 unsetenv(cur->name);
2311 free(cur->name);
2312 free(cur->value);
2313 while (next->next != cur)
2314 next = next->next;
2315 next->next = cur->next;
2316 }
2317 free(cur);
2318 }
2319 }
2320}
2321#endif
2322
2323static int is_assignment(const char *s)
2324{
wdenkc26e4542004-04-18 10:13:26 +00002325 if (s == NULL)
2326 return 0;
2327
2328 if (!isalpha(*s)) return 0;
wdenkfe8c2802002-11-03 00:38:21 +00002329 ++s;
2330 while(isalnum(*s) || *s=='_') ++s;
2331 return *s=='=';
2332}
2333
2334#ifndef __U_BOOT__
2335/* the src parameter allows us to peek forward to a possible &n syntax
2336 * for file descriptor duplication, e.g., "2>&1".
2337 * Return code is 0 normally, 1 if a syntax error is detected in src.
2338 * Resource errors (in xmalloc) cause the process to exit */
2339static int setup_redirect(struct p_context *ctx, int fd, redir_type style,
2340 struct in_str *input)
2341{
2342 struct child_prog *child=ctx->child;
2343 struct redir_struct *redir = child->redirects;
2344 struct redir_struct *last_redir=NULL;
2345
2346 /* Create a new redir_struct and drop it onto the end of the linked list */
2347 while(redir) {
2348 last_redir=redir;
2349 redir=redir->next;
2350 }
2351 redir = xmalloc(sizeof(struct redir_struct));
2352 redir->next=NULL;
2353 redir->word.gl_pathv=NULL;
2354 if (last_redir) {
2355 last_redir->next=redir;
2356 } else {
2357 child->redirects=redir;
2358 }
2359
2360 redir->type=style;
2361 redir->fd= (fd==-1) ? redir_table[style].default_fd : fd ;
2362
2363 debug_printf("Redirect type %d%s\n", redir->fd, redir_table[style].descrip);
2364
2365 /* Check for a '2>&1' type redirect */
2366 redir->dup = redirect_dup_num(input);
2367 if (redir->dup == -2) return 1; /* syntax error */
2368 if (redir->dup != -1) {
2369 /* Erik had a check here that the file descriptor in question
2370 * is legit; I postpone that to "run time"
2371 * A "-" representation of "close me" shows up as a -3 here */
2372 debug_printf("Duplicating redirect '%d>&%d'\n", redir->fd, redir->dup);
2373 } else {
2374 /* We do _not_ try to open the file that src points to,
2375 * since we need to return and let src be expanded first.
2376 * Set ctx->pending_redirect, so we know what to do at the
2377 * end of the next parsed word.
2378 */
2379 ctx->pending_redirect = redir;
2380 }
2381 return 0;
2382}
2383#endif
2384
2385struct pipe *new_pipe(void) {
2386 struct pipe *pi;
2387 pi = xmalloc(sizeof(struct pipe));
2388 pi->num_progs = 0;
2389 pi->progs = NULL;
2390 pi->next = NULL;
2391 pi->followup = 0; /* invalid */
Wolfgang Denke98f68b2005-09-28 01:49:47 +02002392 pi->r_mode = RES_NONE;
wdenkfe8c2802002-11-03 00:38:21 +00002393 return pi;
2394}
2395
2396static void initialize_context(struct p_context *ctx)
2397{
2398 ctx->pipe=NULL;
2399#ifndef __U_BOOT__
2400 ctx->pending_redirect=NULL;
2401#endif
2402 ctx->child=NULL;
2403 ctx->list_head=new_pipe();
2404 ctx->pipe=ctx->list_head;
2405 ctx->w=RES_NONE;
2406 ctx->stack=NULL;
2407#ifdef __U_BOOT__
2408 ctx->old_flag=0;
2409#endif
2410 done_command(ctx); /* creates the memory for working child */
2411}
2412
2413/* normal return is 0
2414 * if a reserved word is found, and processed, return 1
2415 * should handle if, then, elif, else, fi, for, while, until, do, done.
2416 * case, function, and select are obnoxious, save those for later.
2417 */
wdenk3e386912003-04-05 00:53:31 +00002418struct reserved_combo {
2419 char *literal;
2420 int code;
2421 long flag;
2422};
2423/* Mostly a list of accepted follow-up reserved words.
2424 * FLAG_END means we are done with the sequence, and are ready
2425 * to turn the compound list into a command.
2426 * FLAG_START means the word must start a new compound list.
2427 */
2428static struct reserved_combo reserved_list[] = {
2429 { "if", RES_IF, FLAG_THEN | FLAG_START },
2430 { "then", RES_THEN, FLAG_ELIF | FLAG_ELSE | FLAG_FI },
2431 { "elif", RES_ELIF, FLAG_THEN },
2432 { "else", RES_ELSE, FLAG_FI },
2433 { "fi", RES_FI, FLAG_END },
2434 { "for", RES_FOR, FLAG_IN | FLAG_START },
2435 { "while", RES_WHILE, FLAG_DO | FLAG_START },
2436 { "until", RES_UNTIL, FLAG_DO | FLAG_START },
2437 { "in", RES_IN, FLAG_DO },
2438 { "do", RES_DO, FLAG_DONE },
2439 { "done", RES_DONE, FLAG_END }
2440};
2441#define NRES (sizeof(reserved_list)/sizeof(struct reserved_combo))
2442
wdenkfe8c2802002-11-03 00:38:21 +00002443int reserved_word(o_string *dest, struct p_context *ctx)
2444{
wdenkfe8c2802002-11-03 00:38:21 +00002445 struct reserved_combo *r;
2446 for (r=reserved_list;
wdenkfe8c2802002-11-03 00:38:21 +00002447 r<reserved_list+NRES; r++) {
2448 if (strcmp(dest->data, r->literal) == 0) {
2449 debug_printf("found reserved word %s, code %d\n",r->literal,r->code);
2450 if (r->flag & FLAG_START) {
2451 struct p_context *new = xmalloc(sizeof(struct p_context));
2452 debug_printf("push stack\n");
2453 if (ctx->w == RES_IN || ctx->w == RES_FOR) {
2454 syntax();
2455 free(new);
2456 ctx->w = RES_SNTX;
2457 b_reset(dest);
2458 return 1;
2459 }
2460 *new = *ctx; /* physical copy */
2461 initialize_context(ctx);
2462 ctx->stack=new;
2463 } else if ( ctx->w == RES_NONE || ! (ctx->old_flag & (1<<r->code))) {
2464 syntax();
2465 ctx->w = RES_SNTX;
2466 b_reset(dest);
2467 return 1;
2468 }
2469 ctx->w=r->code;
2470 ctx->old_flag = r->flag;
2471 if (ctx->old_flag & FLAG_END) {
2472 struct p_context *old;
2473 debug_printf("pop stack\n");
2474 done_pipe(ctx,PIPE_SEQ);
2475 old = ctx->stack;
2476 old->child->group = ctx->list_head;
2477#ifndef __U_BOOT__
2478 old->child->subshell = 0;
2479#endif
2480 *ctx = *old; /* physical copy */
2481 free(old);
2482 }
2483 b_reset (dest);
2484 return 1;
2485 }
2486 }
2487 return 0;
2488}
2489
2490/* normal return is 0.
2491 * Syntax or xglob errors return 1. */
2492static int done_word(o_string *dest, struct p_context *ctx)
2493{
2494 struct child_prog *child=ctx->child;
2495#ifndef __U_BOOT__
2496 glob_t *glob_target;
2497 int gr, flags = 0;
2498#else
2499 char *str, *s;
2500 int argc, cnt;
2501#endif
2502
2503 debug_printf("done_word: %s %p\n", dest->data, child);
2504 if (dest->length == 0 && !dest->nonnull) {
2505 debug_printf(" true null, ignored\n");
2506 return 0;
2507 }
2508#ifndef __U_BOOT__
2509 if (ctx->pending_redirect) {
2510 glob_target = &ctx->pending_redirect->word;
2511 } else {
2512#endif
2513 if (child->group) {
2514 syntax();
2515 return 1; /* syntax error, groups and arglists don't mix */
2516 }
2517 if (!child->argv && (ctx->type & FLAG_PARSE_SEMICOLON)) {
2518 debug_printf("checking %s for reserved-ness\n",dest->data);
2519 if (reserved_word(dest,ctx)) return ctx->w==RES_SNTX;
2520 }
2521#ifndef __U_BOOT__
2522 glob_target = &child->glob_result;
wdenk8bde7f72003-06-27 21:31:46 +00002523 if (child->argv) flags |= GLOB_APPEND;
wdenkfe8c2802002-11-03 00:38:21 +00002524#else
2525 for (cnt = 1, s = dest->data; s && *s; s++) {
2526 if (*s == '\\') s++;
2527 cnt++;
2528 }
2529 str = malloc(cnt);
2530 if (!str) return 1;
2531 if ( child->argv == NULL) {
2532 child->argc=0;
2533 }
2534 argc = ++child->argc;
2535 child->argv = realloc(child->argv, (argc+1)*sizeof(*child->argv));
2536 if (child->argv == NULL) return 1;
2537 child->argv[argc-1]=str;
2538 child->argv[argc]=NULL;
2539 for (s = dest->data; s && *s; s++,str++) {
2540 if (*s == '\\') s++;
2541 *str = *s;
2542 }
2543 *str = '\0';
2544#endif
2545#ifndef __U_BOOT__
2546 }
2547 gr = xglob(dest, flags, glob_target);
2548 if (gr != 0) return 1;
2549#endif
2550
2551 b_reset(dest);
2552#ifndef __U_BOOT__
2553 if (ctx->pending_redirect) {
2554 ctx->pending_redirect=NULL;
2555 if (glob_target->gl_pathc != 1) {
2556 error_msg("ambiguous redirect");
2557 return 1;
2558 }
2559 } else {
2560 child->argv = glob_target->gl_pathv;
2561 }
2562#endif
2563 if (ctx->w == RES_FOR) {
2564 done_word(dest,ctx);
2565 done_pipe(ctx,PIPE_SEQ);
2566 }
2567 return 0;
2568}
2569
2570/* The only possible error here is out of memory, in which case
2571 * xmalloc exits. */
2572static int done_command(struct p_context *ctx)
2573{
2574 /* The child is really already in the pipe structure, so
2575 * advance the pipe counter and make a new, null child.
2576 * Only real trickiness here is that the uncommitted
2577 * child structure, to which ctx->child points, is not
2578 * counted in pi->num_progs. */
2579 struct pipe *pi=ctx->pipe;
2580 struct child_prog *prog=ctx->child;
2581
2582 if (prog && prog->group == NULL
wdenk8bde7f72003-06-27 21:31:46 +00002583 && prog->argv == NULL
wdenkfe8c2802002-11-03 00:38:21 +00002584#ifndef __U_BOOT__
wdenk8bde7f72003-06-27 21:31:46 +00002585 && prog->redirects == NULL) {
wdenkfe8c2802002-11-03 00:38:21 +00002586#else
2587 ) {
2588#endif
2589 debug_printf("done_command: skipping null command\n");
2590 return 0;
2591 } else if (prog) {
2592 pi->num_progs++;
2593 debug_printf("done_command: num_progs incremented to %d\n",pi->num_progs);
2594 } else {
2595 debug_printf("done_command: initializing\n");
2596 }
2597 pi->progs = xrealloc(pi->progs, sizeof(*pi->progs) * (pi->num_progs+1));
2598
2599 prog = pi->progs + pi->num_progs;
2600#ifndef __U_BOOT__
2601 prog->redirects = NULL;
2602#endif
2603 prog->argv = NULL;
2604#ifndef __U_BOOT__
2605 prog->is_stopped = 0;
2606#endif
2607 prog->group = NULL;
2608#ifndef __U_BOOT__
2609 prog->glob_result.gl_pathv = NULL;
2610 prog->family = pi;
2611#endif
2612 prog->sp = 0;
2613 ctx->child = prog;
2614 prog->type = ctx->type;
2615
2616 /* but ctx->pipe and ctx->list_head remain unchanged */
2617 return 0;
2618}
2619
2620static int done_pipe(struct p_context *ctx, pipe_style type)
2621{
2622 struct pipe *new_p;
2623 done_command(ctx); /* implicit closure of previous command */
2624 debug_printf("done_pipe, type %d\n", type);
2625 ctx->pipe->followup = type;
2626 ctx->pipe->r_mode = ctx->w;
2627 new_p=new_pipe();
2628 ctx->pipe->next = new_p;
2629 ctx->pipe = new_p;
2630 ctx->child = NULL;
2631 done_command(ctx); /* set up new pipe to accept commands */
2632 return 0;
2633}
2634
2635#ifndef __U_BOOT__
2636/* peek ahead in the in_str to find out if we have a "&n" construct,
2637 * as in "2>&1", that represents duplicating a file descriptor.
2638 * returns either -2 (syntax error), -1 (no &), or the number found.
2639 */
2640static int redirect_dup_num(struct in_str *input)
2641{
2642 int ch, d=0, ok=0;
2643 ch = b_peek(input);
2644 if (ch != '&') return -1;
2645
2646 b_getch(input); /* get the & */
2647 ch=b_peek(input);
2648 if (ch == '-') {
2649 b_getch(input);
2650 return -3; /* "-" represents "close me" */
2651 }
2652 while (isdigit(ch)) {
2653 d = d*10+(ch-'0');
2654 ok=1;
2655 b_getch(input);
2656 ch = b_peek(input);
2657 }
2658 if (ok) return d;
2659
2660 error_msg("ambiguous redirect");
2661 return -2;
2662}
2663
2664/* If a redirect is immediately preceded by a number, that number is
2665 * supposed to tell which file descriptor to redirect. This routine
2666 * looks for such preceding numbers. In an ideal world this routine
2667 * needs to handle all the following classes of redirects...
2668 * echo 2>foo # redirects fd 2 to file "foo", nothing passed to echo
2669 * echo 49>foo # redirects fd 49 to file "foo", nothing passed to echo
2670 * echo -2>foo # redirects fd 1 to file "foo", "-2" passed to echo
2671 * echo 49x>foo # redirects fd 1 to file "foo", "49x" passed to echo
2672 * A -1 output from this program means no valid number was found, so the
2673 * caller should use the appropriate default for this redirection.
2674 */
2675static int redirect_opt_num(o_string *o)
2676{
2677 int num;
2678
2679 if (o->length==0) return -1;
2680 for(num=0; num<o->length; num++) {
2681 if (!isdigit(*(o->data+num))) {
2682 return -1;
2683 }
2684 }
2685 /* reuse num (and save an int) */
2686 num=atoi(o->data);
2687 b_reset(o);
2688 return num;
2689}
2690
2691FILE *generate_stream_from_list(struct pipe *head)
2692{
2693 FILE *pf;
2694#if 1
2695 int pid, channel[2];
2696 if (pipe(channel)<0) perror_msg_and_die("pipe");
2697 pid=fork();
2698 if (pid<0) {
2699 perror_msg_and_die("fork");
2700 } else if (pid==0) {
2701 close(channel[0]);
2702 if (channel[1] != 1) {
2703 dup2(channel[1],1);
2704 close(channel[1]);
2705 }
2706#if 0
2707#define SURROGATE "surrogate response"
2708 write(1,SURROGATE,sizeof(SURROGATE));
2709 _exit(run_list(head));
2710#else
2711 _exit(run_list_real(head)); /* leaks memory */
2712#endif
2713 }
2714 debug_printf("forked child %d\n",pid);
2715 close(channel[1]);
2716 pf = fdopen(channel[0],"r");
2717 debug_printf("pipe on FILE *%p\n",pf);
2718#else
2719 free_pipe_list(head,0);
2720 pf=popen("echo surrogate response","r");
2721 debug_printf("started fake pipe on FILE *%p\n",pf);
2722#endif
2723 return pf;
2724}
2725
2726/* this version hacked for testing purposes */
2727/* return code is exit status of the process that is run. */
2728static int process_command_subs(o_string *dest, struct p_context *ctx, struct in_str *input, int subst_end)
2729{
2730 int retcode;
2731 o_string result=NULL_O_STRING;
2732 struct p_context inner;
2733 FILE *p;
2734 struct in_str pipe_str;
2735 initialize_context(&inner);
2736
2737 /* recursion to generate command */
2738 retcode = parse_stream(&result, &inner, input, subst_end);
2739 if (retcode != 0) return retcode; /* syntax error or EOF */
2740 done_word(&result, &inner);
2741 done_pipe(&inner, PIPE_SEQ);
2742 b_free(&result);
2743
2744 p=generate_stream_from_list(inner.list_head);
2745 if (p==NULL) return 1;
2746 mark_open(fileno(p));
2747 setup_file_in_str(&pipe_str, p);
2748
2749 /* now send results of command back into original context */
2750 retcode = parse_stream(dest, ctx, &pipe_str, '\0');
2751 /* XXX In case of a syntax error, should we try to kill the child?
2752 * That would be tough to do right, so just read until EOF. */
2753 if (retcode == 1) {
2754 while (b_getch(&pipe_str)!=EOF) { /* discard */ };
2755 }
2756
2757 debug_printf("done reading from pipe, pclose()ing\n");
2758 /* This is the step that wait()s for the child. Should be pretty
2759 * safe, since we just read an EOF from its stdout. We could try
2760 * to better, by using wait(), and keeping track of background jobs
2761 * at the same time. That would be a lot of work, and contrary
2762 * to the KISS philosophy of this program. */
2763 mark_closed(fileno(p));
2764 retcode=pclose(p);
2765 free_pipe_list(inner.list_head,0);
2766 debug_printf("pclosed, retcode=%d\n",retcode);
2767 /* XXX this process fails to trim a single trailing newline */
2768 return retcode;
2769}
2770
2771static int parse_group(o_string *dest, struct p_context *ctx,
2772 struct in_str *input, int ch)
2773{
2774 int rcode, endch=0;
2775 struct p_context sub;
2776 struct child_prog *child = ctx->child;
2777 if (child->argv) {
2778 syntax();
2779 return 1; /* syntax error, groups and arglists don't mix */
2780 }
2781 initialize_context(&sub);
2782 switch(ch) {
2783 case '(': endch=')'; child->subshell=1; break;
2784 case '{': endch='}'; break;
2785 default: syntax(); /* really logic error */
2786 }
2787 rcode=parse_stream(dest,&sub,input,endch);
2788 done_word(dest,&sub); /* finish off the final word in the subcontext */
2789 done_pipe(&sub, PIPE_SEQ); /* and the final command there, too */
2790 child->group = sub.list_head;
2791 return rcode;
2792 /* child remains "open", available for possible redirects */
2793}
2794#endif
2795
2796/* basically useful version until someone wants to get fancier,
2797 * see the bash man page under "Parameter Expansion" */
2798static char *lookup_param(char *src)
2799{
wdenkc26e4542004-04-18 10:13:26 +00002800 char *p;
2801
2802 if (!src)
2803 return NULL;
2804
wdenkfe8c2802002-11-03 00:38:21 +00002805 p = getenv(src);
2806 if (!p)
2807 p = get_local_var(src);
wdenkc26e4542004-04-18 10:13:26 +00002808
wdenkfe8c2802002-11-03 00:38:21 +00002809 return p;
2810}
2811
wdenkc26e4542004-04-18 10:13:26 +00002812#ifdef __U_BOOT__
2813static char *get_dollar_var(char ch)
2814{
2815 static char buf[40];
2816
2817 buf[0] = '\0';
2818 switch (ch) {
2819 case '?':
2820 sprintf(buf, "%u", (unsigned int)last_return_code);
2821 break;
2822 default:
2823 return NULL;
2824 }
2825 return buf;
2826}
2827#endif
2828
wdenkfe8c2802002-11-03 00:38:21 +00002829/* return code: 0 for OK, 1 for syntax error */
2830static int handle_dollar(o_string *dest, struct p_context *ctx, struct in_str *input)
2831{
2832#ifndef __U_BOOT__
2833 int i, advance=0;
2834#else
2835 int advance=0;
2836#endif
2837#ifndef __U_BOOT__
2838 char sep[]=" ";
2839#endif
2840 int ch = input->peek(input); /* first character after the $ */
2841 debug_printf("handle_dollar: ch=%c\n",ch);
2842 if (isalpha(ch)) {
2843 b_addchr(dest, SPECIAL_VAR_SYMBOL);
2844 ctx->child->sp++;
2845 while(ch=b_peek(input),isalnum(ch) || ch=='_') {
2846 b_getch(input);
2847 b_addchr(dest,ch);
2848 }
2849 b_addchr(dest, SPECIAL_VAR_SYMBOL);
2850#ifndef __U_BOOT__
2851 } else if (isdigit(ch)) {
2852 i = ch-'0'; /* XXX is $0 special? */
2853 if (i<global_argc) {
2854 parse_string(dest, ctx, global_argv[i]); /* recursion */
2855 }
2856 advance = 1;
2857#endif
2858 } else switch (ch) {
2859#ifndef __U_BOOT__
2860 case '$':
2861 b_adduint(dest,getpid());
2862 advance = 1;
2863 break;
2864 case '!':
2865 if (last_bg_pid > 0) b_adduint(dest, last_bg_pid);
2866 advance = 1;
2867 break;
2868#endif
2869 case '?':
wdenkc26e4542004-04-18 10:13:26 +00002870#ifndef __U_BOOT__
wdenkfe8c2802002-11-03 00:38:21 +00002871 b_adduint(dest,last_return_code);
wdenkc26e4542004-04-18 10:13:26 +00002872#else
2873 ctx->child->sp++;
2874 b_addchr(dest, SPECIAL_VAR_SYMBOL);
2875 b_addchr(dest, '$');
2876 b_addchr(dest, '?');
2877 b_addchr(dest, SPECIAL_VAR_SYMBOL);
2878#endif
wdenkfe8c2802002-11-03 00:38:21 +00002879 advance = 1;
2880 break;
2881#ifndef __U_BOOT__
2882 case '#':
2883 b_adduint(dest,global_argc ? global_argc-1 : 0);
2884 advance = 1;
2885 break;
2886#endif
2887 case '{':
2888 b_addchr(dest, SPECIAL_VAR_SYMBOL);
2889 ctx->child->sp++;
2890 b_getch(input);
2891 /* XXX maybe someone will try to escape the '}' */
2892 while(ch=b_getch(input),ch!=EOF && ch!='}') {
2893 b_addchr(dest,ch);
2894 }
2895 if (ch != '}') {
2896 syntax();
2897 return 1;
2898 }
2899 b_addchr(dest, SPECIAL_VAR_SYMBOL);
2900 break;
2901#ifndef __U_BOOT__
2902 case '(':
2903 b_getch(input);
2904 process_command_subs(dest, ctx, input, ')');
2905 break;
2906 case '*':
2907 sep[0]=ifs[0];
2908 for (i=1; i<global_argc; i++) {
2909 parse_string(dest, ctx, global_argv[i]);
2910 if (i+1 < global_argc) parse_string(dest, ctx, sep);
2911 }
2912 break;
2913 case '@':
2914 case '-':
2915 case '_':
2916 /* still unhandled, but should be eventually */
2917 error_msg("unhandled syntax: $%c",ch);
2918 return 1;
2919 break;
2920#endif
2921 default:
2922 b_addqchr(dest,'$',dest->quote);
2923 }
2924 /* Eat the character if the flag was set. If the compiler
2925 * is smart enough, we could substitute "b_getch(input);"
2926 * for all the "advance = 1;" above, and also end up with
2927 * a nice size-optimized program. Hah! That'll be the day.
2928 */
2929 if (advance) b_getch(input);
2930 return 0;
2931}
2932
2933#ifndef __U_BOOT__
2934int parse_string(o_string *dest, struct p_context *ctx, const char *src)
2935{
2936 struct in_str foo;
2937 setup_string_in_str(&foo, src);
2938 return parse_stream(dest, ctx, &foo, '\0');
2939}
2940#endif
2941
2942/* return code is 0 for normal exit, 1 for syntax error */
2943int parse_stream(o_string *dest, struct p_context *ctx,
2944 struct in_str *input, int end_trigger)
2945{
2946 unsigned int ch, m;
2947#ifndef __U_BOOT__
2948 int redir_fd;
2949 redir_type redir_style;
2950#endif
2951 int next;
2952
2953 /* Only double-quote state is handled in the state variable dest->quote.
2954 * A single-quote triggers a bypass of the main loop until its mate is
2955 * found. When recursing, quote state is passed in via dest->quote. */
2956
2957 debug_printf("parse_stream, end_trigger=%d\n",end_trigger);
2958 while ((ch=b_getch(input))!=EOF) {
2959 m = map[ch];
2960#ifdef __U_BOOT__
2961 if (input->__promptme == 0) return 1;
2962#endif
2963 next = (ch == '\n') ? 0 : b_peek(input);
wdenkc26e4542004-04-18 10:13:26 +00002964
2965 debug_printf("parse_stream: ch=%c (%d) m=%d quote=%d - %c\n",
2966 ch >= ' ' ? ch : '.', ch, m,
2967 dest->quote, ctx->stack == NULL ? '*' : '.');
2968
wdenkfe8c2802002-11-03 00:38:21 +00002969 if (m==0 || ((m==1 || m==2) && dest->quote)) {
2970 b_addqchr(dest, ch, dest->quote);
2971 } else {
2972 if (m==2) { /* unquoted IFS */
2973 if (done_word(dest, ctx)) {
2974 return 1;
2975 }
2976 /* If we aren't performing a substitution, treat a newline as a
2977 * command separator. */
2978 if (end_trigger != '\0' && ch=='\n')
2979 done_pipe(ctx,PIPE_SEQ);
2980 }
2981 if (ch == end_trigger && !dest->quote && ctx->w==RES_NONE) {
2982 debug_printf("leaving parse_stream (triggered)\n");
2983 return 0;
2984 }
2985#if 0
2986 if (ch=='\n') {
2987 /* Yahoo! Time to run with it! */
2988 done_pipe(ctx,PIPE_SEQ);
2989 run_list(ctx->list_head);
2990 initialize_context(ctx);
2991 }
2992#endif
2993 if (m!=2) switch (ch) {
2994 case '#':
2995 if (dest->length == 0 && !dest->quote) {
2996 while(ch=b_peek(input),ch!=EOF && ch!='\n') { b_getch(input); }
2997 } else {
2998 b_addqchr(dest, ch, dest->quote);
2999 }
3000 break;
3001 case '\\':
3002 if (next == EOF) {
3003 syntax();
3004 return 1;
3005 }
3006 b_addqchr(dest, '\\', dest->quote);
3007 b_addqchr(dest, b_getch(input), dest->quote);
3008 break;
3009 case '$':
3010 if (handle_dollar(dest, ctx, input)!=0) return 1;
3011 break;
3012 case '\'':
3013 dest->nonnull = 1;
3014 while(ch=b_getch(input),ch!=EOF && ch!='\'') {
3015#ifdef __U_BOOT__
3016 if(input->__promptme == 0) return 1;
3017#endif
3018 b_addchr(dest,ch);
3019 }
3020 if (ch==EOF) {
3021 syntax();
3022 return 1;
3023 }
3024 break;
3025 case '"':
3026 dest->nonnull = 1;
3027 dest->quote = !dest->quote;
3028 break;
3029#ifndef __U_BOOT__
3030 case '`':
3031 process_command_subs(dest, ctx, input, '`');
3032 break;
3033 case '>':
3034 redir_fd = redirect_opt_num(dest);
3035 done_word(dest, ctx);
3036 redir_style=REDIRECT_OVERWRITE;
3037 if (next == '>') {
3038 redir_style=REDIRECT_APPEND;
3039 b_getch(input);
3040 } else if (next == '(') {
3041 syntax(); /* until we support >(list) Process Substitution */
3042 return 1;
3043 }
3044 setup_redirect(ctx, redir_fd, redir_style, input);
3045 break;
3046 case '<':
3047 redir_fd = redirect_opt_num(dest);
3048 done_word(dest, ctx);
3049 redir_style=REDIRECT_INPUT;
3050 if (next == '<') {
3051 redir_style=REDIRECT_HEREIS;
3052 b_getch(input);
3053 } else if (next == '>') {
3054 redir_style=REDIRECT_IO;
3055 b_getch(input);
3056 } else if (next == '(') {
3057 syntax(); /* until we support <(list) Process Substitution */
3058 return 1;
3059 }
3060 setup_redirect(ctx, redir_fd, redir_style, input);
3061 break;
3062#endif
3063 case ';':
3064 done_word(dest, ctx);
3065 done_pipe(ctx,PIPE_SEQ);
3066 break;
3067 case '&':
3068 done_word(dest, ctx);
3069 if (next=='&') {
3070 b_getch(input);
3071 done_pipe(ctx,PIPE_AND);
3072 } else {
3073#ifndef __U_BOOT__
3074 done_pipe(ctx,PIPE_BG);
3075#else
3076 syntax_err();
3077 return 1;
3078#endif
3079 }
3080 break;
3081 case '|':
3082 done_word(dest, ctx);
3083 if (next=='|') {
3084 b_getch(input);
3085 done_pipe(ctx,PIPE_OR);
3086 } else {
3087 /* we could pick up a file descriptor choice here
3088 * with redirect_opt_num(), but bash doesn't do it.
3089 * "echo foo 2| cat" yields "foo 2". */
3090#ifndef __U_BOOT__
3091 done_command(ctx);
3092#else
3093 syntax_err();
3094 return 1;
3095#endif
3096 }
3097 break;
3098#ifndef __U_BOOT__
3099 case '(':
3100 case '{':
3101 if (parse_group(dest, ctx, input, ch)!=0) return 1;
3102 break;
3103 case ')':
3104 case '}':
3105 syntax(); /* Proper use of this character caught by end_trigger */
3106 return 1;
3107 break;
3108#endif
3109 default:
3110 syntax(); /* this is really an internal logic error */
3111 return 1;
3112 }
3113 }
3114 }
3115 /* complain if quote? No, maybe we just finished a command substitution
3116 * that was quoted. Example:
3117 * $ echo "`cat foo` plus more"
3118 * and we just got the EOF generated by the subshell that ran "cat foo"
3119 * The only real complaint is if we got an EOF when end_trigger != '\0',
3120 * that is, we were really supposed to get end_trigger, and never got
3121 * one before the EOF. Can't use the standard "syntax error" return code,
3122 * so that parse_stream_outer can distinguish the EOF and exit smoothly. */
3123 debug_printf("leaving parse_stream (EOF)\n");
3124 if (end_trigger != '\0') return -1;
3125 return 0;
3126}
3127
3128void mapset(const unsigned char *set, int code)
3129{
3130 const unsigned char *s;
3131 for (s=set; *s; s++) map[*s] = code;
3132}
3133
3134void update_ifs_map(void)
3135{
3136 /* char *ifs and char map[256] are both globals. */
Wolfgang Denk77ddac92005-10-13 16:45:02 +02003137 ifs = (uchar *)getenv("IFS");
3138 if (ifs == NULL) ifs=(uchar *)" \t\n";
wdenkfe8c2802002-11-03 00:38:21 +00003139 /* Precompute a list of 'flow through' behavior so it can be treated
3140 * quickly up front. Computation is necessary because of IFS.
3141 * Special case handling of IFS == " \t\n" is not implemented.
3142 * The map[] array only really needs two bits each, and on most machines
3143 * that would be faster because of the reduced L1 cache footprint.
3144 */
3145 memset(map,0,sizeof(map)); /* most characters flow through always */
3146#ifndef __U_BOOT__
Wolfgang Denk77ddac92005-10-13 16:45:02 +02003147 mapset((uchar *)"\\$'\"`", 3); /* never flow through */
3148 mapset((uchar *)"<>;&|(){}#", 1); /* flow through if quoted */
wdenkfe8c2802002-11-03 00:38:21 +00003149#else
Wolfgang Denk77ddac92005-10-13 16:45:02 +02003150 mapset((uchar *)"\\$'\"", 3); /* never flow through */
3151 mapset((uchar *)";&|#", 1); /* flow through if quoted */
wdenkfe8c2802002-11-03 00:38:21 +00003152#endif
3153 mapset(ifs, 2); /* also flow through if quoted */
3154}
3155
3156/* most recursion does not come through here, the exeception is
3157 * from builtin_source() */
3158int parse_stream_outer(struct in_str *inp, int flag)
3159{
3160
3161 struct p_context ctx;
3162 o_string temp=NULL_O_STRING;
3163 int rcode;
3164#ifdef __U_BOOT__
3165 int code = 0;
3166#endif
3167 do {
3168 ctx.type = flag;
3169 initialize_context(&ctx);
3170 update_ifs_map();
Wolfgang Denk77ddac92005-10-13 16:45:02 +02003171 if (!(flag & FLAG_PARSE_SEMICOLON) || (flag & FLAG_REPARSING)) mapset((uchar *)";$&|", 0);
wdenkfe8c2802002-11-03 00:38:21 +00003172 inp->promptmode=1;
3173 rcode = parse_stream(&temp, &ctx, inp, '\n');
3174#ifdef __U_BOOT__
3175 if (rcode == 1) flag_repeat = 0;
3176#endif
3177 if (rcode != 1 && ctx.old_flag != 0) {
3178 syntax();
3179#ifdef __U_BOOT__
3180 flag_repeat = 0;
3181#endif
3182 }
3183 if (rcode != 1 && ctx.old_flag == 0) {
3184 done_word(&temp, &ctx);
3185 done_pipe(&ctx,PIPE_SEQ);
3186#ifndef __U_BOOT__
3187 run_list(ctx.list_head);
3188#else
wdenkc26e4542004-04-18 10:13:26 +00003189 code = run_list(ctx.list_head);
3190 if (code == -2) { /* exit */
3191 b_free(&temp);
3192 code = 0;
3193 /* XXX hackish way to not allow exit from main loop */
3194 if (inp->peek == file_peek) {
3195 printf("exit not allowed from main input shell.\n");
3196 continue;
3197 }
3198 break;
3199 }
3200 if (code == -1)
wdenkfe8c2802002-11-03 00:38:21 +00003201 flag_repeat = 0;
3202#endif
3203 } else {
3204 if (ctx.old_flag != 0) {
3205 free(ctx.stack);
3206 b_reset(&temp);
3207 }
3208#ifdef __U_BOOT__
3209 if (inp->__promptme == 0) printf("<INTERRUPT>\n");
3210 inp->__promptme = 1;
3211#endif
3212 temp.nonnull = 0;
3213 temp.quote = 0;
3214 inp->p = NULL;
3215 free_pipe_list(ctx.list_head,0);
3216 }
3217 b_free(&temp);
3218 } while (rcode != -1 && !(flag & FLAG_EXIT_FROM_LOOP)); /* loop on syntax errors, return on EOF */
3219#ifndef __U_BOOT__
3220 return 0;
3221#else
3222 return (code != 0) ? 1 : 0;
3223#endif /* __U_BOOT__ */
3224}
3225
3226#ifndef __U_BOOT__
3227static int parse_string_outer(const char *s, int flag)
3228#else
3229int parse_string_outer(char *s, int flag)
3230#endif /* __U_BOOT__ */
3231{
3232 struct in_str input;
3233#ifdef __U_BOOT__
3234 char *p = NULL;
3235 int rcode;
3236 if ( !s || !*s)
3237 return 1;
3238 if (!(p = strchr(s, '\n')) || *++p) {
3239 p = xmalloc(strlen(s) + 2);
3240 strcpy(p, s);
3241 strcat(p, "\n");
3242 setup_string_in_str(&input, p);
3243 rcode = parse_stream_outer(&input, flag);
3244 free(p);
3245 return rcode;
3246 } else {
3247#endif
3248 setup_string_in_str(&input, s);
3249 return parse_stream_outer(&input, flag);
3250#ifdef __U_BOOT__
3251 }
3252#endif
3253}
3254
3255#ifndef __U_BOOT__
3256static int parse_file_outer(FILE *f)
3257#else
3258int parse_file_outer(void)
3259#endif
3260{
3261 int rcode;
3262 struct in_str input;
3263#ifndef __U_BOOT__
3264 setup_file_in_str(&input, f);
3265#else
3266 setup_file_in_str(&input);
3267#endif
3268 rcode = parse_stream_outer(&input, FLAG_PARSE_SEMICOLON);
3269 return rcode;
3270}
3271
3272#ifdef __U_BOOT__
wdenk3e386912003-04-05 00:53:31 +00003273static void u_boot_hush_reloc(void)
3274{
3275 DECLARE_GLOBAL_DATA_PTR;
3276 unsigned long addr;
3277 struct reserved_combo *r;
3278
3279 for (r=reserved_list; r<reserved_list+NRES; r++) {
3280 addr = (ulong) (r->literal) + gd->reloc_off;
3281 r->literal = (char *)addr;
3282 }
3283}
3284
wdenkfe8c2802002-11-03 00:38:21 +00003285int u_boot_hush_start(void)
3286{
wdenk2d5b5612003-10-14 19:43:55 +00003287 if (top_vars == NULL) {
3288 top_vars = malloc(sizeof(struct variables));
3289 top_vars->name = "HUSH_VERSION";
3290 top_vars->value = "0.01";
3291 top_vars->next = 0;
3292 top_vars->flg_export = 0;
3293 top_vars->flg_read_only = 1;
3294 u_boot_hush_reloc();
3295 }
wdenkfe8c2802002-11-03 00:38:21 +00003296 return 0;
3297}
3298
3299static void *xmalloc(size_t size)
3300{
3301 void *p = NULL;
3302
3303 if (!(p = malloc(size))) {
3304 printf("ERROR : memory not allocated\n");
3305 for(;;);
3306 }
3307 return p;
3308}
3309
3310static void *xrealloc(void *ptr, size_t size)
3311{
3312 void *p = NULL;
3313
3314 if (!(p = realloc(ptr, size))) {
3315 printf("ERROR : memory not allocated\n");
3316 for(;;);
3317 }
3318 return p;
3319}
3320#endif /* __U_BOOT__ */
3321
3322#ifndef __U_BOOT__
3323/* Make sure we have a controlling tty. If we get started under a job
3324 * aware app (like bash for example), make sure we are now in charge so
3325 * we don't fight over who gets the foreground */
wdenkd0fb80c2003-01-11 09:48:40 +00003326static void setup_job_control(void)
wdenkfe8c2802002-11-03 00:38:21 +00003327{
3328 static pid_t shell_pgrp;
3329 /* Loop until we are in the foreground. */
3330 while (tcgetpgrp (shell_terminal) != (shell_pgrp = getpgrp ()))
3331 kill (- shell_pgrp, SIGTTIN);
3332
3333 /* Ignore interactive and job-control signals. */
3334 signal(SIGINT, SIG_IGN);
3335 signal(SIGQUIT, SIG_IGN);
3336 signal(SIGTERM, SIG_IGN);
3337 signal(SIGTSTP, SIG_IGN);
3338 signal(SIGTTIN, SIG_IGN);
3339 signal(SIGTTOU, SIG_IGN);
3340 signal(SIGCHLD, SIG_IGN);
3341
3342 /* Put ourselves in our own process group. */
3343 setsid();
3344 shell_pgrp = getpid ();
3345 setpgid (shell_pgrp, shell_pgrp);
3346
3347 /* Grab control of the terminal. */
3348 tcsetpgrp(shell_terminal, shell_pgrp);
3349}
3350
3351int hush_main(int argc, char **argv)
3352{
3353 int opt;
3354 FILE *input;
3355 char **e = environ;
3356
3357 /* XXX what should these be while sourcing /etc/profile? */
3358 global_argc = argc;
3359 global_argv = argv;
3360
3361 /* (re?) initialize globals. Sometimes hush_main() ends up calling
3362 * hush_main(), therefore we cannot rely on the BSS to zero out this
3363 * stuff. Reset these to 0 every time. */
3364 ifs = NULL;
3365 /* map[] is taken care of with call to update_ifs_map() */
3366 fake_mode = 0;
3367 interactive = 0;
3368 close_me_head = NULL;
3369 last_bg_pid = 0;
3370 job_list = NULL;
3371 last_jobid = 0;
3372
3373 /* Initialize some more globals to non-zero values */
3374 set_cwd();
wdenkd0fb80c2003-01-11 09:48:40 +00003375#ifdef CONFIG_FEATURE_COMMAND_EDITING
wdenkfe8c2802002-11-03 00:38:21 +00003376 cmdedit_set_initial_prompt();
3377#else
3378 PS1 = NULL;
3379#endif
3380 PS2 = "> ";
3381
3382 /* initialize our shell local variables with the values
3383 * currently living in the environment */
3384 if (e) {
3385 for (; *e; e++)
3386 set_local_var(*e, 2); /* without call putenv() */
3387 }
3388
3389 last_return_code=EXIT_SUCCESS;
3390
3391
3392 if (argv[0] && argv[0][0] == '-') {
3393 debug_printf("\nsourcing /etc/profile\n");
3394 if ((input = fopen("/etc/profile", "r")) != NULL) {
3395 mark_open(fileno(input));
3396 parse_file_outer(input);
3397 mark_closed(fileno(input));
3398 fclose(input);
3399 }
3400 }
3401 input=stdin;
3402
3403 while ((opt = getopt(argc, argv, "c:xif")) > 0) {
3404 switch (opt) {
3405 case 'c':
3406 {
3407 global_argv = argv+optind;
3408 global_argc = argc-optind;
3409 opt = parse_string_outer(optarg, FLAG_PARSE_SEMICOLON);
3410 goto final_return;
3411 }
3412 break;
3413 case 'i':
3414 interactive++;
3415 break;
3416 case 'f':
3417 fake_mode++;
3418 break;
3419 default:
3420#ifndef BB_VER
3421 fprintf(stderr, "Usage: sh [FILE]...\n"
3422 " or: sh -c command [args]...\n\n");
3423 exit(EXIT_FAILURE);
3424#else
3425 show_usage();
3426#endif
3427 }
3428 }
3429 /* A shell is interactive if the `-i' flag was given, or if all of
3430 * the following conditions are met:
3431 * no -c command
3432 * no arguments remaining or the -s flag given
3433 * standard input is a terminal
3434 * standard output is a terminal
3435 * Refer to Posix.2, the description of the `sh' utility. */
3436 if (argv[optind]==NULL && input==stdin &&
3437 isatty(fileno(stdin)) && isatty(fileno(stdout))) {
3438 interactive++;
3439 }
3440
3441 debug_printf("\ninteractive=%d\n", interactive);
3442 if (interactive) {
3443 /* Looks like they want an interactive shell */
wdenk8bde7f72003-06-27 21:31:46 +00003444#ifndef CONFIG_FEATURE_SH_EXTRA_QUIET
wdenkd0fb80c2003-01-11 09:48:40 +00003445 printf( "\n\n" BB_BANNER " hush - the humble shell v0.01 (testing)\n");
3446 printf( "Enter 'help' for a list of built-in commands.\n\n");
3447#endif
wdenkfe8c2802002-11-03 00:38:21 +00003448 setup_job_control();
3449 }
3450
3451 if (argv[optind]==NULL) {
3452 opt=parse_file_outer(stdin);
3453 goto final_return;
3454 }
3455
3456 debug_printf("\nrunning script '%s'\n", argv[optind]);
3457 global_argv = argv+optind;
3458 global_argc = argc-optind;
3459 input = xfopen(argv[optind], "r");
3460 opt = parse_file_outer(input);
3461
wdenkd0fb80c2003-01-11 09:48:40 +00003462#ifdef CONFIG_FEATURE_CLEAN_UP
wdenkfe8c2802002-11-03 00:38:21 +00003463 fclose(input);
3464 if (cwd && cwd != unknown)
3465 free((char*)cwd);
3466 {
3467 struct variables *cur, *tmp;
3468 for(cur = top_vars; cur; cur = tmp) {
3469 tmp = cur->next;
3470 if (!cur->flg_read_only) {
3471 free(cur->name);
3472 free(cur->value);
3473 free(cur);
3474 }
3475 }
3476 }
3477#endif
3478
3479final_return:
3480 return(opt?opt:last_return_code);
3481}
3482#endif
3483
3484static char *insert_var_value(char *inp)
3485{
3486 int res_str_len = 0;
3487 int len;
3488 int done = 0;
3489 char *p, *p1, *res_str = NULL;
3490
3491 while ((p = strchr(inp, SPECIAL_VAR_SYMBOL))) {
3492 if (p != inp) {
3493 len = p - inp;
3494 res_str = xrealloc(res_str, (res_str_len + len));
3495 strncpy((res_str + res_str_len), inp, len);
3496 res_str_len += len;
3497 }
3498 inp = ++p;
3499 p = strchr(inp, SPECIAL_VAR_SYMBOL);
3500 *p = '\0';
3501 if ((p1 = lookup_param(inp))) {
3502 len = res_str_len + strlen(p1);
3503 res_str = xrealloc(res_str, (1 + len));
3504 strcpy((res_str + res_str_len), p1);
3505 res_str_len = len;
3506 }
3507 *p = SPECIAL_VAR_SYMBOL;
3508 inp = ++p;
3509 done = 1;
3510 }
3511 if (done) {
3512 res_str = xrealloc(res_str, (1 + res_str_len + strlen(inp)));
3513 strcpy((res_str + res_str_len), inp);
3514 while ((p = strchr(res_str, '\n'))) {
3515 *p = ' ';
3516 }
3517 }
3518 return (res_str == NULL) ? inp : res_str;
3519}
3520
3521static char **make_list_in(char **inp, char *name)
3522{
3523 int len, i;
3524 int name_len = strlen(name);
3525 int n = 0;
3526 char **list;
3527 char *p1, *p2, *p3;
3528
3529 /* create list of variable values */
3530 list = xmalloc(sizeof(*list));
3531 for (i = 0; inp[i]; i++) {
3532 p3 = insert_var_value(inp[i]);
3533 p1 = p3;
3534 while (*p1) {
3535 if ((*p1 == ' ')) {
3536 p1++;
3537 continue;
3538 }
3539 if ((p2 = strchr(p1, ' '))) {
3540 len = p2 - p1;
3541 } else {
3542 len = strlen(p1);
3543 p2 = p1 + len;
3544 }
3545 /* we use n + 2 in realloc for list,because we add
3546 * new element and then we will add NULL element */
3547 list = xrealloc(list, sizeof(*list) * (n + 2));
3548 list[n] = xmalloc(2 + name_len + len);
3549 strcpy(list[n], name);
3550 strcat(list[n], "=");
3551 strncat(list[n], p1, len);
3552 list[n++][name_len + len + 1] = '\0';
3553 p1 = p2;
3554 }
3555 if (p3 != inp[i]) free(p3);
3556 }
3557 list[n] = NULL;
3558 return list;
3559}
3560
3561/* Make new string for parser */
3562static char * make_string(char ** inp)
3563{
3564 char *p;
3565 char *str = NULL;
3566 int n;
3567 int len = 2;
3568
3569 for (n = 0; inp[n]; n++) {
3570 p = insert_var_value(inp[n]);
3571 str = xrealloc(str, (len + strlen(p)));
3572 if (n) {
3573 strcat(str, " ");
3574 } else {
3575 *str = '\0';
3576 }
3577 strcat(str, p);
3578 len = strlen(str) + 3;
3579 if (p != inp[n]) free(p);
3580 }
3581 len = strlen(str);
3582 *(str + len) = '\n';
3583 *(str + len + 1) = '\0';
3584 return str;
3585}
3586
3587#endif /* CFG_HUSH_PARSER */
3588/****************************************************************************/