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