blob: 4c84c2f50153fefe78e814729c5a84c55dc903f2 [file] [log] [blame]
wdenkfe8c2802002-11-03 00:38:21 +00001/*
2 * sh.c -- a prototype Bourne shell grammar parser
3 * Intended to follow the original Thompson and Ritchie
4 * "small and simple is beautiful" philosophy, which
5 * incidentally is a good match to today's BusyBox.
6 *
7 * Copyright (C) 2000,2001 Larry Doolittle <larry@doolittle.boa.org>
8 *
9 * Credits:
10 * The parser routines proper are all original material, first
11 * written Dec 2000 and Jan 2001 by Larry Doolittle.
12 * The execution engine, the builtins, and much of the underlying
13 * support has been adapted from busybox-0.49pre's lash,
14 * which is Copyright (C) 2000 by Lineo, Inc., and
15 * written by Erik Andersen <andersen@lineo.com>, <andersee@debian.org>.
16 * That, in turn, is based in part on ladsh.c, by Michael K. Johnson and
17 * Erik W. Troan, which they placed in the public domain. I don't know
18 * how much of the Johnson/Troan code has survived the repeated rewrites.
19 * Other credits:
wdenkfe8c2802002-11-03 00:38:21 +000020 * b_addchr() derived from similar w_addchar function in glibc-2.2
21 * setup_redirect(), redirect_opt_num(), and big chunks of main()
22 * and many builtins derived from contributions by Erik Andersen
23 * miscellaneous bugfixes from Matt Kraai
24 *
25 * There are two big (and related) architecture differences between
26 * this parser and the lash parser. One is that this version is
27 * actually designed from the ground up to understand nearly all
28 * of the Bourne grammar. The second, consequential change is that
29 * the parser and input reader have been turned inside out. Now,
30 * the parser is in control, and asks for input as needed. The old
31 * way had the input reader in control, and it asked for parsing to
32 * take place as needed. The new way makes it much easier to properly
33 * handle the recursion implicit in the various substitutions, especially
34 * across continuation lines.
35 *
36 * Bash grammar not implemented: (how many of these were in original sh?)
37 * $@ (those sure look like weird quoting rules)
38 * $_
39 * ! negation operator for pipes
40 * &> and >& redirection of stdout+stderr
41 * Brace Expansion
42 * Tilde Expansion
43 * fancy forms of Parameter Expansion
44 * aliases
45 * Arithmetic Expansion
46 * <(list) and >(list) Process Substitution
47 * reserved words: case, esac, select, function
48 * Here Documents ( << word )
49 * Functions
50 * Major bugs:
51 * job handling woefully incomplete and buggy
52 * reserved word execution woefully incomplete and buggy
53 * to-do:
54 * port selected bugfixes from post-0.49 busybox lash - done?
55 * finish implementing reserved words: for, while, until, do, done
56 * change { and } from special chars to reserved words
57 * builtins: break, continue, eval, return, set, trap, ulimit
58 * test magic exec
59 * handle children going into background
60 * clean up recognition of null pipes
61 * check setting of global_argc and global_argv
62 * control-C handling, probably with longjmp
63 * follow IFS rules more precisely, including update semantics
64 * figure out what to do with backslash-newline
65 * explain why we use signal instead of sigaction
66 * propagate syntax errors, die on resource errors?
67 * continuation lines, both explicit and implicit - done?
68 * memory leak finding and plugging - done?
69 * more testing, especially quoting rules and redirection
70 * document how quoting rules not precisely followed for variable assignments
71 * maybe change map[] to use 2-bit entries
72 * (eventually) remove all the printf's
73 *
74 * This program is free software; you can redistribute it and/or modify
75 * it under the terms of the GNU General Public License as published by
76 * the Free Software Foundation; either version 2 of the License, or
77 * (at your option) any later version.
78 *
79 * This program is distributed in the hope that it will be useful,
80 * but WITHOUT ANY WARRANTY; without even the implied warranty of
81 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
82 * General Public License for more details.
83 *
84 * You should have received a copy of the GNU General Public License
85 * along with this program; if not, write to the Free Software
86 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
87 */
88#define __U_BOOT__
89#ifdef __U_BOOT__
90#include <malloc.h> /* malloc, free, realloc*/
91#include <linux/ctype.h> /* isalpha, isdigit */
92#include <common.h> /* readline */
93#include <hush.h>
94#include <command.h> /* find_cmd */
Tom Rini219f4782012-06-19 15:54:35 -070095#ifndef CONFIG_SYS_PROMPT_HUSH_PS2
96#define CONFIG_SYS_PROMPT_HUSH_PS2 "> "
97#endif
wdenkfe8c2802002-11-03 00:38:21 +000098#endif
wdenkfe8c2802002-11-03 00:38:21 +000099#ifndef __U_BOOT__
100#include <ctype.h> /* isalpha, isdigit */
101#include <unistd.h> /* getpid */
102#include <stdlib.h> /* getenv, atoi */
103#include <string.h> /* strchr */
104#include <stdio.h> /* popen etc. */
105#include <glob.h> /* glob, of course */
106#include <stdarg.h> /* va_list */
107#include <errno.h>
108#include <fcntl.h>
109#include <getopt.h> /* should be pretty obvious */
110
111#include <sys/stat.h> /* ulimit */
112#include <sys/types.h>
113#include <sys/wait.h>
114#include <signal.h>
115
116/* #include <dmalloc.h> */
wdenkfe8c2802002-11-03 00:38:21 +0000117
wdenkd0fb80c2003-01-11 09:48:40 +0000118#if 1
wdenkfe8c2802002-11-03 00:38:21 +0000119#include "busybox.h"
120#include "cmdedit.h"
121#else
122#define applet_name "hush"
123#include "standalone.h"
124#define hush_main main
wdenkd0fb80c2003-01-11 09:48:40 +0000125#undef CONFIG_FEATURE_SH_FANCY_PROMPT
126#define BB_BANNER
wdenkfe8c2802002-11-03 00:38:21 +0000127#endif
128#endif
129#define SPECIAL_VAR_SYMBOL 03
Joe Hershbergera005f192012-08-17 10:26:30 +0000130#define SUBSTED_VAR_SYMBOL 04
wdenkfe8c2802002-11-03 00:38:21 +0000131#ifndef __U_BOOT__
132#define FLAG_EXIT_FROM_LOOP 1
133#define FLAG_PARSE_SEMICOLON (1 << 1) /* symbol ';' is special for parser */
134#define FLAG_REPARSING (1 << 2) /* >= 2nd pass */
135
136#endif
137
138#ifdef __U_BOOT__
Wolfgang Denkd87080b2006-03-31 18:32:53 +0200139DECLARE_GLOBAL_DATA_PTR;
140
wdenkfe8c2802002-11-03 00:38:21 +0000141#define EXIT_SUCCESS 0
142#define EOF -1
143#define syntax() syntax_err()
144#define xstrdup strdup
145#define error_msg printf
146#else
147typedef enum {
148 REDIRECT_INPUT = 1,
149 REDIRECT_OVERWRITE = 2,
150 REDIRECT_APPEND = 3,
151 REDIRECT_HEREIS = 4,
152 REDIRECT_IO = 5
153} redir_type;
154
155/* The descrip member of this structure is only used to make debugging
156 * output pretty */
157struct {int mode; int default_fd; char *descrip;} redir_table[] = {
158 { 0, 0, "()" },
159 { O_RDONLY, 0, "<" },
160 { O_CREAT|O_TRUNC|O_WRONLY, 1, ">" },
161 { O_CREAT|O_APPEND|O_WRONLY, 1, ">>" },
162 { O_RDONLY, -1, "<<" },
163 { O_RDWR, 1, "<>" }
164};
165#endif
166
167typedef enum {
168 PIPE_SEQ = 1,
169 PIPE_AND = 2,
170 PIPE_OR = 3,
171 PIPE_BG = 4,
172} pipe_style;
173
174/* might eventually control execution */
175typedef enum {
176 RES_NONE = 0,
177 RES_IF = 1,
178 RES_THEN = 2,
179 RES_ELIF = 3,
180 RES_ELSE = 4,
181 RES_FI = 5,
182 RES_FOR = 6,
183 RES_WHILE = 7,
184 RES_UNTIL = 8,
185 RES_DO = 9,
186 RES_DONE = 10,
187 RES_XXXX = 11,
188 RES_IN = 12,
189 RES_SNTX = 13
190} reserved_style;
191#define FLAG_END (1<<RES_NONE)
192#define FLAG_IF (1<<RES_IF)
193#define FLAG_THEN (1<<RES_THEN)
194#define FLAG_ELIF (1<<RES_ELIF)
195#define FLAG_ELSE (1<<RES_ELSE)
196#define FLAG_FI (1<<RES_FI)
197#define FLAG_FOR (1<<RES_FOR)
198#define FLAG_WHILE (1<<RES_WHILE)
199#define FLAG_UNTIL (1<<RES_UNTIL)
200#define FLAG_DO (1<<RES_DO)
201#define FLAG_DONE (1<<RES_DONE)
202#define FLAG_IN (1<<RES_IN)
203#define FLAG_START (1<<RES_XXXX)
204
205/* This holds pointers to the various results of parsing */
206struct p_context {
207 struct child_prog *child;
208 struct pipe *list_head;
209 struct pipe *pipe;
210#ifndef __U_BOOT__
211 struct redir_struct *pending_redirect;
212#endif
213 reserved_style w;
214 int old_flag; /* for figuring out valid reserved words */
215 struct p_context *stack;
216 int type; /* define type of parser : ";$" common or special symbol */
217 /* How about quoting status? */
218};
219
220#ifndef __U_BOOT__
221struct redir_struct {
222 redir_type type; /* type of redirection */
223 int fd; /* file descriptor being redirected */
224 int dup; /* -1, or file descriptor being duplicated */
225 struct redir_struct *next; /* pointer to the next redirect in the list */
226 glob_t word; /* *word.gl_pathv is the filename */
227};
228#endif
229
230struct child_prog {
231#ifndef __U_BOOT__
232 pid_t pid; /* 0 if exited */
233#endif
234 char **argv; /* program name and arguments */
235#ifdef __U_BOOT__
236 int argc; /* number of program arguments */
237#endif
238 struct pipe *group; /* if non-NULL, first in group or subshell */
239#ifndef __U_BOOT__
240 int subshell; /* flag, non-zero if group must be forked */
241 struct redir_struct *redirects; /* I/O redirections */
242 glob_t glob_result; /* result of parameter globbing */
243 int is_stopped; /* is the program currently running? */
244 struct pipe *family; /* pointer back to the child's parent pipe */
245#endif
246 int sp; /* number of SPECIAL_VAR_SYMBOL */
247 int type;
248};
249
250struct pipe {
251#ifndef __U_BOOT__
252 int jobid; /* job number */
253#endif
254 int num_progs; /* total number of programs in job */
255#ifndef __U_BOOT__
256 int running_progs; /* number of programs running */
257 char *text; /* name of job */
258 char *cmdbuf; /* buffer various argv's point into */
259 pid_t pgrp; /* process group ID for the job */
260#endif
261 struct child_prog *progs; /* array of commands in pipe */
262 struct pipe *next; /* to track background commands */
263#ifndef __U_BOOT__
264 int stopped_progs; /* number of programs alive, but stopped */
265 int job_context; /* bitmask defining current context */
266#endif
267 pipe_style followup; /* PIPE_BG, PIPE_SEQ, PIPE_OR, PIPE_AND */
268 reserved_style r_mode; /* supports if, for, while, until */
269};
270
271#ifndef __U_BOOT__
272struct close_me {
273 int fd;
274 struct close_me *next;
275};
276#endif
277
278struct variables {
279 char *name;
280 char *value;
281 int flg_export;
282 int flg_read_only;
283 struct variables *next;
284};
285
286/* globals, connect us to the outside world
287 * the first three support $?, $#, and $1 */
288#ifndef __U_BOOT__
289char **global_argv;
290unsigned int global_argc;
291#endif
292unsigned int last_return_code;
wdenkc26e4542004-04-18 10:13:26 +0000293int nesting_level;
wdenkfe8c2802002-11-03 00:38:21 +0000294#ifndef __U_BOOT__
295extern char **environ; /* This is in <unistd.h>, but protected with __USE_GNU */
296#endif
297
298/* "globals" within this file */
Wolfgang Denk77ddac92005-10-13 16:45:02 +0200299static uchar *ifs;
wdenkfe8c2802002-11-03 00:38:21 +0000300static char map[256];
301#ifndef __U_BOOT__
302static int fake_mode;
303static int interactive;
304static struct close_me *close_me_head;
305static const char *cwd;
306static struct pipe *job_list;
307static unsigned int last_bg_pid;
308static unsigned int last_jobid;
309static unsigned int shell_terminal;
310static char *PS1;
311static char *PS2;
312struct variables shell_ver = { "HUSH_VERSION", "0.01", 1, 1, 0 };
313struct variables *top_vars = &shell_ver;
314#else
315static int flag_repeat = 0;
316static int do_repeat = 0;
wdenk2d5b5612003-10-14 19:43:55 +0000317static struct variables *top_vars = NULL ;
wdenkfe8c2802002-11-03 00:38:21 +0000318#endif /*__U_BOOT__ */
319
320#define B_CHUNK (100)
321#define B_NOSPAC 1
322
323typedef struct {
324 char *data;
325 int length;
326 int maxlen;
327 int quote;
328 int nonnull;
329} o_string;
330#define NULL_O_STRING {NULL,0,0,0,0}
331/* used for initialization:
332 o_string foo = NULL_O_STRING; */
333
334/* I can almost use ordinary FILE *. Is open_memstream() universally
335 * available? Where is it documented? */
336struct in_str {
337 const char *p;
338#ifndef __U_BOOT__
339 char peek_buf[2];
340#endif
341 int __promptme;
342 int promptmode;
343#ifndef __U_BOOT__
344 FILE *file;
345#endif
346 int (*get) (struct in_str *);
347 int (*peek) (struct in_str *);
348};
349#define b_getch(input) ((input)->get(input))
350#define b_peek(input) ((input)->peek(input))
351
352#ifndef __U_BOOT__
353#define JOB_STATUS_FORMAT "[%d] %-22s %.40s\n"
354
355struct built_in_command {
356 char *cmd; /* name */
357 char *descr; /* description */
358 int (*function) (struct child_prog *); /* function ptr */
359};
360#endif
361
Stefan Roese4cacf7c2008-08-19 14:57:55 +0200362/* define DEBUG_SHELL for debugging output (obviously ;-)) */
363#if 0
364#define DEBUG_SHELL
365#endif
366
wdenkfe8c2802002-11-03 00:38:21 +0000367/* This should be in utility.c */
368#ifdef DEBUG_SHELL
369#ifndef __U_BOOT__
370static void debug_printf(const char *format, ...)
371{
372 va_list args;
373 va_start(args, format);
374 vfprintf(stderr, format, args);
375 va_end(args);
376}
377#else
Stefan Roese4cacf7c2008-08-19 14:57:55 +0200378#define debug_printf(fmt,args...) printf (fmt ,##args)
wdenkfe8c2802002-11-03 00:38:21 +0000379#endif
380#else
381static inline void debug_printf(const char *format, ...) { }
382#endif
383#define final_printf debug_printf
384
385#ifdef __U_BOOT__
386static void syntax_err(void) {
387 printf("syntax error\n");
388}
389#else
390static void __syntax(char *file, int line) {
391 error_msg("syntax error %s:%d", file, line);
392}
393#define syntax() __syntax(__FILE__, __LINE__)
394#endif
395
396#ifdef __U_BOOT__
397static void *xmalloc(size_t size);
398static void *xrealloc(void *ptr, size_t size);
399#else
400/* Index of subroutines: */
401/* function prototypes for builtins */
402static int builtin_cd(struct child_prog *child);
403static int builtin_env(struct child_prog *child);
404static int builtin_eval(struct child_prog *child);
405static int builtin_exec(struct child_prog *child);
406static int builtin_exit(struct child_prog *child);
407static int builtin_export(struct child_prog *child);
408static int builtin_fg_bg(struct child_prog *child);
409static int builtin_help(struct child_prog *child);
410static int builtin_jobs(struct child_prog *child);
411static int builtin_pwd(struct child_prog *child);
412static int builtin_read(struct child_prog *child);
413static int builtin_set(struct child_prog *child);
414static int builtin_shift(struct child_prog *child);
415static int builtin_source(struct child_prog *child);
416static int builtin_umask(struct child_prog *child);
417static int builtin_unset(struct child_prog *child);
418static int builtin_not_written(struct child_prog *child);
419#endif
420/* o_string manipulation: */
421static int b_check_space(o_string *o, int len);
422static int b_addchr(o_string *o, int ch);
423static void b_reset(o_string *o);
424static int b_addqchr(o_string *o, int ch, int quote);
wdenkc26e4542004-04-18 10:13:26 +0000425#ifndef __U_BOOT__
wdenkfe8c2802002-11-03 00:38:21 +0000426static int b_adduint(o_string *o, unsigned int i);
wdenkc26e4542004-04-18 10:13:26 +0000427#endif
wdenkfe8c2802002-11-03 00:38:21 +0000428/* in_str manipulations: */
429static int static_get(struct in_str *i);
430static int static_peek(struct in_str *i);
431static int file_get(struct in_str *i);
432static int file_peek(struct in_str *i);
433#ifndef __U_BOOT__
434static void setup_file_in_str(struct in_str *i, FILE *f);
435#else
436static void setup_file_in_str(struct in_str *i);
437#endif
438static void setup_string_in_str(struct in_str *i, const char *s);
439#ifndef __U_BOOT__
440/* close_me manipulations: */
441static void mark_open(int fd);
442static void mark_closed(int fd);
wdenkd0fb80c2003-01-11 09:48:40 +0000443static void close_all(void);
wdenkfe8c2802002-11-03 00:38:21 +0000444#endif
445/* "run" the final data structures: */
446static char *indenter(int i);
447static int free_pipe_list(struct pipe *head, int indent);
448static int free_pipe(struct pipe *pi, int indent);
449/* really run the final data structures: */
450#ifndef __U_BOOT__
451static int setup_redirects(struct child_prog *prog, int squirrel[]);
452#endif
453static int run_list_real(struct pipe *pi);
454#ifndef __U_BOOT__
455static void pseudo_exec(struct child_prog *child) __attribute__ ((noreturn));
456#endif
457static int run_pipe_real(struct pipe *pi);
458/* extended glob support: */
459#ifndef __U_BOOT__
460static int globhack(const char *src, int flags, glob_t *pglob);
461static int glob_needed(const char *s);
462static int xglob(o_string *dest, int flags, glob_t *pglob);
463#endif
464/* variable assignment: */
465static int is_assignment(const char *s);
466/* data structure manipulation: */
467#ifndef __U_BOOT__
468static int setup_redirect(struct p_context *ctx, int fd, redir_type style, struct in_str *input);
469#endif
470static void initialize_context(struct p_context *ctx);
471static int done_word(o_string *dest, struct p_context *ctx);
472static int done_command(struct p_context *ctx);
473static int done_pipe(struct p_context *ctx, pipe_style type);
474/* primary string parsing: */
475#ifndef __U_BOOT__
476static int redirect_dup_num(struct in_str *input);
477static int redirect_opt_num(o_string *o);
478static int process_command_subs(o_string *dest, struct p_context *ctx, struct in_str *input, int subst_end);
479static int parse_group(o_string *dest, struct p_context *ctx, struct in_str *input, int ch);
480#endif
481static char *lookup_param(char *src);
482static char *make_string(char **inp);
483static int handle_dollar(o_string *dest, struct p_context *ctx, struct in_str *input);
484#ifndef __U_BOOT__
485static int parse_string(o_string *dest, struct p_context *ctx, const char *src);
486#endif
487static int parse_stream(o_string *dest, struct p_context *ctx, struct in_str *input0, int end_trigger);
488/* setup: */
489static int parse_stream_outer(struct in_str *inp, int flag);
490#ifndef __U_BOOT__
491static int parse_string_outer(const char *s, int flag);
492static int parse_file_outer(FILE *f);
493#endif
494#ifndef __U_BOOT__
495/* job management: */
496static int checkjobs(struct pipe* fg_pipe);
497static void insert_bg_job(struct pipe *pi);
498static void remove_bg_job(struct pipe *pi);
499#endif
500/* local variable support */
501static char **make_list_in(char **inp, char *name);
502static char *insert_var_value(char *inp);
Joe Hershbergera005f192012-08-17 10:26:30 +0000503static char *insert_var_value_sub(char *inp, int tag_subst);
wdenkfe8c2802002-11-03 00:38:21 +0000504
505#ifndef __U_BOOT__
506/* Table of built-in functions. They can be forked or not, depending on
507 * context: within pipes, they fork. As simple commands, they do not.
508 * When used in non-forking context, they can change global variables
509 * in the parent shell process. If forked, of course they can not.
510 * For example, 'unset foo | whatever' will parse and run, but foo will
511 * still be set at the end. */
512static struct built_in_command bltins[] = {
513 {"bg", "Resume a job in the background", builtin_fg_bg},
514 {"break", "Exit for, while or until loop", builtin_not_written},
515 {"cd", "Change working directory", builtin_cd},
516 {"continue", "Continue for, while or until loop", builtin_not_written},
517 {"env", "Print all environment variables", builtin_env},
518 {"eval", "Construct and run shell command", builtin_eval},
519 {"exec", "Exec command, replacing this shell with the exec'd process",
520 builtin_exec},
521 {"exit", "Exit from shell()", builtin_exit},
522 {"export", "Set environment variable", builtin_export},
523 {"fg", "Bring job into the foreground", builtin_fg_bg},
524 {"jobs", "Lists the active jobs", builtin_jobs},
525 {"pwd", "Print current directory", builtin_pwd},
526 {"read", "Input environment variable", builtin_read},
527 {"return", "Return from a function", builtin_not_written},
528 {"set", "Set/unset shell local variables", builtin_set},
529 {"shift", "Shift positional parameters", builtin_shift},
530 {"trap", "Trap signals", builtin_not_written},
531 {"ulimit","Controls resource limits", builtin_not_written},
532 {"umask","Sets file creation mask", builtin_umask},
533 {"unset", "Unset environment variable", builtin_unset},
534 {".", "Source-in and run commands in a file", builtin_source},
535 {"help", "List shell built-in commands", builtin_help},
536 {NULL, NULL, NULL}
537};
538
539static const char *set_cwd(void)
540{
541 if(cwd==unknown)
542 cwd = NULL; /* xgetcwd(arg) called free(arg) */
543 cwd = xgetcwd((char *)cwd);
544 if (!cwd)
545 cwd = unknown;
546 return cwd;
547}
548
549/* built-in 'eval' handler */
550static int builtin_eval(struct child_prog *child)
551{
552 char *str = NULL;
553 int rcode = EXIT_SUCCESS;
554
555 if (child->argv[1]) {
556 str = make_string(child->argv + 1);
557 parse_string_outer(str, FLAG_EXIT_FROM_LOOP |
558 FLAG_PARSE_SEMICOLON);
559 free(str);
560 rcode = last_return_code;
561 }
562 return rcode;
563}
564
565/* built-in 'cd <path>' handler */
566static int builtin_cd(struct child_prog *child)
567{
568 char *newdir;
569 if (child->argv[1] == NULL)
570 newdir = getenv("HOME");
571 else
572 newdir = child->argv[1];
573 if (chdir(newdir)) {
574 printf("cd: %s: %s\n", newdir, strerror(errno));
575 return EXIT_FAILURE;
576 }
577 set_cwd();
578 return EXIT_SUCCESS;
579}
580
581/* built-in 'env' handler */
582static int builtin_env(struct child_prog *dummy)
583{
584 char **e = environ;
585 if (e == NULL) return EXIT_FAILURE;
586 for (; *e; e++) {
587 puts(*e);
588 }
589 return EXIT_SUCCESS;
590}
591
592/* built-in 'exec' handler */
593static int builtin_exec(struct child_prog *child)
594{
595 if (child->argv[1] == NULL)
596 return EXIT_SUCCESS; /* Really? */
597 child->argv++;
598 pseudo_exec(child);
599 /* never returns */
600}
601
602/* built-in 'exit' handler */
603static int builtin_exit(struct child_prog *child)
604{
605 if (child->argv[1] == NULL)
606 exit(last_return_code);
607 exit (atoi(child->argv[1]));
608}
609
610/* built-in 'export VAR=value' handler */
611static int builtin_export(struct child_prog *child)
612{
613 int res = 0;
614 char *name = child->argv[1];
615
616 if (name == NULL) {
617 return (builtin_env(child));
618 }
619
620 name = strdup(name);
621
622 if(name) {
623 char *value = strchr(name, '=');
624
625 if (!value) {
626 char *tmp;
627 /* They are exporting something without an =VALUE */
628
629 value = get_local_var(name);
630 if (value) {
631 size_t ln = strlen(name);
632
633 tmp = realloc(name, ln+strlen(value)+2);
634 if(tmp==NULL)
635 res = -1;
636 else {
637 sprintf(tmp+ln, "=%s", value);
638 name = tmp;
639 }
640 } else {
641 /* bash does not return an error when trying to export
642 * an undefined variable. Do likewise. */
643 res = 1;
644 }
645 }
646 }
647 if (res<0)
648 perror_msg("export");
649 else if(res==0)
650 res = set_local_var(name, 1);
651 else
652 res = 0;
653 free(name);
654 return res;
655}
656
657/* built-in 'fg' and 'bg' handler */
658static int builtin_fg_bg(struct child_prog *child)
659{
660 int i, jobnum;
661 struct pipe *pi=NULL;
662
663 if (!interactive)
664 return EXIT_FAILURE;
665 /* If they gave us no args, assume they want the last backgrounded task */
666 if (!child->argv[1]) {
667 for (pi = job_list; pi; pi = pi->next) {
668 if (pi->jobid == last_jobid) {
669 break;
670 }
671 }
672 if (!pi) {
673 error_msg("%s: no current job", child->argv[0]);
674 return EXIT_FAILURE;
675 }
676 } else {
677 if (sscanf(child->argv[1], "%%%d", &jobnum) != 1) {
678 error_msg("%s: bad argument '%s'", child->argv[0], child->argv[1]);
679 return EXIT_FAILURE;
680 }
681 for (pi = job_list; pi; pi = pi->next) {
682 if (pi->jobid == jobnum) {
683 break;
684 }
685 }
686 if (!pi) {
687 error_msg("%s: %d: no such job", child->argv[0], jobnum);
688 return EXIT_FAILURE;
689 }
690 }
691
692 if (*child->argv[0] == 'f') {
693 /* Put the job into the foreground. */
694 tcsetpgrp(shell_terminal, pi->pgrp);
695 }
696
697 /* Restart the processes in the job */
698 for (i = 0; i < pi->num_progs; i++)
699 pi->progs[i].is_stopped = 0;
700
701 if ( (i=kill(- pi->pgrp, SIGCONT)) < 0) {
702 if (i == ESRCH) {
703 remove_bg_job(pi);
704 } else {
705 perror_msg("kill (SIGCONT)");
706 }
707 }
708
709 pi->stopped_progs = 0;
710 return EXIT_SUCCESS;
711}
712
713/* built-in 'help' handler */
714static int builtin_help(struct child_prog *dummy)
715{
716 struct built_in_command *x;
717
718 printf("\nBuilt-in commands:\n");
719 printf("-------------------\n");
720 for (x = bltins; x->cmd; x++) {
721 if (x->descr==NULL)
722 continue;
723 printf("%s\t%s\n", x->cmd, x->descr);
724 }
725 printf("\n\n");
726 return EXIT_SUCCESS;
727}
728
729/* built-in 'jobs' handler */
730static int builtin_jobs(struct child_prog *child)
731{
732 struct pipe *job;
733 char *status_string;
734
735 for (job = job_list; job; job = job->next) {
736 if (job->running_progs == job->stopped_progs)
737 status_string = "Stopped";
738 else
739 status_string = "Running";
740
741 printf(JOB_STATUS_FORMAT, job->jobid, status_string, job->text);
742 }
743 return EXIT_SUCCESS;
744}
745
746
747/* built-in 'pwd' handler */
748static int builtin_pwd(struct child_prog *dummy)
749{
750 puts(set_cwd());
751 return EXIT_SUCCESS;
752}
753
754/* built-in 'read VAR' handler */
755static int builtin_read(struct child_prog *child)
756{
757 int res;
758
759 if (child->argv[1]) {
760 char string[BUFSIZ];
761 char *var = 0;
762
763 string[0] = 0; /* In case stdin has only EOF */
764 /* read string */
765 fgets(string, sizeof(string), stdin);
766 chomp(string);
767 var = malloc(strlen(child->argv[1])+strlen(string)+2);
768 if(var) {
769 sprintf(var, "%s=%s", child->argv[1], string);
770 res = set_local_var(var, 0);
771 } else
772 res = -1;
773 if (res)
774 fprintf(stderr, "read: %m\n");
775 free(var); /* So not move up to avoid breaking errno */
776 return res;
777 } else {
778 do res=getchar(); while(res!='\n' && res!=EOF);
779 return 0;
780 }
781}
782
783/* built-in 'set VAR=value' handler */
784static int builtin_set(struct child_prog *child)
785{
786 char *temp = child->argv[1];
787 struct variables *e;
788
789 if (temp == NULL)
790 for(e = top_vars; e; e=e->next)
791 printf("%s=%s\n", e->name, e->value);
792 else
793 set_local_var(temp, 0);
794
795 return EXIT_SUCCESS;
796}
797
798
799/* Built-in 'shift' handler */
800static int builtin_shift(struct child_prog *child)
801{
802 int n=1;
803 if (child->argv[1]) {
804 n=atoi(child->argv[1]);
805 }
806 if (n>=0 && n<global_argc) {
807 /* XXX This probably breaks $0 */
808 global_argc -= n;
809 global_argv += n;
810 return EXIT_SUCCESS;
811 } else {
812 return EXIT_FAILURE;
813 }
814}
815
816/* Built-in '.' handler (read-in and execute commands from file) */
817static int builtin_source(struct child_prog *child)
818{
819 FILE *input;
820 int status;
821
822 if (child->argv[1] == NULL)
823 return EXIT_FAILURE;
824
825 /* XXX search through $PATH is missing */
826 input = fopen(child->argv[1], "r");
827 if (!input) {
828 error_msg("Couldn't open file '%s'", child->argv[1]);
829 return EXIT_FAILURE;
830 }
831
832 /* Now run the file */
833 /* XXX argv and argc are broken; need to save old global_argv
834 * (pointer only is OK!) on this stack frame,
835 * set global_argv=child->argv+1, recurse, and restore. */
836 mark_open(fileno(input));
837 status = parse_file_outer(input);
838 mark_closed(fileno(input));
839 fclose(input);
840 return (status);
841}
842
843static int builtin_umask(struct child_prog *child)
844{
845 mode_t new_umask;
846 const char *arg = child->argv[1];
847 char *end;
848 if (arg) {
849 new_umask=strtoul(arg, &end, 8);
850 if (*end!='\0' || end == arg) {
851 return EXIT_FAILURE;
852 }
853 } else {
854 printf("%.3o\n", (unsigned int) (new_umask=umask(0)));
855 }
856 umask(new_umask);
857 return EXIT_SUCCESS;
858}
859
860/* built-in 'unset VAR' handler */
861static int builtin_unset(struct child_prog *child)
862{
863 /* bash returned already true */
864 unset_local_var(child->argv[1]);
865 return EXIT_SUCCESS;
866}
867
868static int builtin_not_written(struct child_prog *child)
869{
870 printf("builtin_%s not written\n",child->argv[0]);
871 return EXIT_FAILURE;
872}
873#endif
874
875static int b_check_space(o_string *o, int len)
876{
877 /* It would be easy to drop a more restrictive policy
878 * in here, such as setting a maximum string length */
879 if (o->length + len > o->maxlen) {
880 char *old_data = o->data;
881 /* assert (data == NULL || o->maxlen != 0); */
882 o->maxlen += max(2*len, B_CHUNK);
883 o->data = realloc(o->data, 1 + o->maxlen);
884 if (o->data == NULL) {
885 free(old_data);
886 }
887 }
888 return o->data == NULL;
889}
890
891static int b_addchr(o_string *o, int ch)
892{
893 debug_printf("b_addchr: %c %d %p\n", ch, o->length, o);
894 if (b_check_space(o, 1)) return B_NOSPAC;
895 o->data[o->length] = ch;
896 o->length++;
897 o->data[o->length] = '\0';
898 return 0;
899}
900
901static void b_reset(o_string *o)
902{
903 o->length = 0;
904 o->nonnull = 0;
905 if (o->data != NULL) *o->data = '\0';
906}
907
908static void b_free(o_string *o)
909{
910 b_reset(o);
wdenkd0fb80c2003-01-11 09:48:40 +0000911 free(o->data);
wdenkfe8c2802002-11-03 00:38:21 +0000912 o->data = NULL;
913 o->maxlen = 0;
914}
915
916/* My analysis of quoting semantics tells me that state information
917 * is associated with a destination, not a source.
918 */
919static int b_addqchr(o_string *o, int ch, int quote)
920{
921 if (quote && strchr("*?[\\",ch)) {
922 int rc;
923 rc = b_addchr(o, '\\');
924 if (rc) return rc;
925 }
926 return b_addchr(o, ch);
927}
928
wdenkc26e4542004-04-18 10:13:26 +0000929#ifndef __U_BOOT__
wdenkfe8c2802002-11-03 00:38:21 +0000930static int b_adduint(o_string *o, unsigned int i)
931{
932 int r;
933 char *p = simple_itoa(i);
934 /* no escape checking necessary */
935 do r=b_addchr(o, *p++); while (r==0 && *p);
936 return r;
937}
wdenkc26e4542004-04-18 10:13:26 +0000938#endif
wdenkfe8c2802002-11-03 00:38:21 +0000939
940static int static_get(struct in_str *i)
941{
Wolfgang Denkd0ff51b2008-07-14 15:19:07 +0200942 int ch = *i->p++;
wdenkfe8c2802002-11-03 00:38:21 +0000943 if (ch=='\0') return EOF;
944 return ch;
945}
946
947static int static_peek(struct in_str *i)
948{
949 return *i->p;
950}
951
952#ifndef __U_BOOT__
953static inline void cmdedit_set_initial_prompt(void)
954{
wdenkd0fb80c2003-01-11 09:48:40 +0000955#ifndef CONFIG_FEATURE_SH_FANCY_PROMPT
wdenkfe8c2802002-11-03 00:38:21 +0000956 PS1 = NULL;
957#else
958 PS1 = getenv("PS1");
959 if(PS1==0)
960 PS1 = "\\w \\$ ";
961#endif
962}
963
964static inline void setup_prompt_string(int promptmode, char **prompt_str)
965{
966 debug_printf("setup_prompt_string %d ",promptmode);
wdenkd0fb80c2003-01-11 09:48:40 +0000967#ifndef CONFIG_FEATURE_SH_FANCY_PROMPT
wdenkfe8c2802002-11-03 00:38:21 +0000968 /* Set up the prompt */
969 if (promptmode == 1) {
wdenkd0fb80c2003-01-11 09:48:40 +0000970 free(PS1);
wdenkfe8c2802002-11-03 00:38:21 +0000971 PS1=xmalloc(strlen(cwd)+4);
972 sprintf(PS1, "%s %s", cwd, ( geteuid() != 0 ) ? "$ ":"# ");
973 *prompt_str = PS1;
974 } else {
975 *prompt_str = PS2;
976 }
977#else
978 *prompt_str = (promptmode==1)? PS1 : PS2;
979#endif
980 debug_printf("result %s\n",*prompt_str);
981}
982#endif
983
984static void get_user_input(struct in_str *i)
985{
986#ifndef __U_BOOT__
987 char *prompt_str;
988 static char the_command[BUFSIZ];
989
990 setup_prompt_string(i->promptmode, &prompt_str);
wdenkd0fb80c2003-01-11 09:48:40 +0000991#ifdef CONFIG_FEATURE_COMMAND_EDITING
wdenkfe8c2802002-11-03 00:38:21 +0000992 /*
993 ** enable command line editing only while a command line
994 ** is actually being read; otherwise, we'll end up bequeathing
995 ** atexit() handlers and other unwanted stuff to our
996 ** child processes (rob@sysgo.de)
997 */
998 cmdedit_read_input(prompt_str, the_command);
999#else
1000 fputs(prompt_str, stdout);
1001 fflush(stdout);
1002 the_command[0]=fgetc(i->file);
1003 the_command[1]='\0';
1004#endif
1005 fflush(stdout);
1006 i->p = the_command;
1007#else
wdenkfe8c2802002-11-03 00:38:21 +00001008 int n;
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02001009 static char the_command[CONFIG_SYS_CBSIZE];
wdenkfe8c2802002-11-03 00:38:21 +00001010
Wolfgang Denk396387a2005-08-12 23:34:51 +02001011#ifdef CONFIG_BOOT_RETRY_TIME
Mike Frysinger882b7d72010-10-20 03:41:17 -04001012# ifndef CONFIG_RESET_TO_RETRY
Wolfgang Denk396387a2005-08-12 23:34:51 +02001013# error "This currently only works with CONFIG_RESET_TO_RETRY enabled"
1014# endif
1015 reset_cmd_timeout();
1016#endif
wdenkfe8c2802002-11-03 00:38:21 +00001017 i->__promptme = 1;
1018 if (i->promptmode == 1) {
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02001019 n = readline(CONFIG_SYS_PROMPT);
wdenkfe8c2802002-11-03 00:38:21 +00001020 } else {
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02001021 n = readline(CONFIG_SYS_PROMPT_HUSH_PS2);
wdenkfe8c2802002-11-03 00:38:21 +00001022 }
Wolfgang Denk396387a2005-08-12 23:34:51 +02001023#ifdef CONFIG_BOOT_RETRY_TIME
1024 if (n == -2) {
1025 puts("\nTimeout waiting for command\n");
1026# ifdef CONFIG_RESET_TO_RETRY
1027 do_reset(NULL, 0, 0, NULL);
1028# else
1029# error "This currently only works with CONFIG_RESET_TO_RETRY enabled"
1030# endif
1031 }
1032#endif
wdenkfe8c2802002-11-03 00:38:21 +00001033 if (n == -1 ) {
1034 flag_repeat = 0;
1035 i->__promptme = 0;
1036 }
1037 n = strlen(console_buffer);
1038 console_buffer[n] = '\n';
1039 console_buffer[n+1]= '\0';
1040 if (had_ctrlc()) flag_repeat = 0;
1041 clear_ctrlc();
1042 do_repeat = 0;
1043 if (i->promptmode == 1) {
1044 if (console_buffer[0] == '\n'&& flag_repeat == 0) {
1045 strcpy(the_command,console_buffer);
1046 }
1047 else {
1048 if (console_buffer[0] != '\n') {
1049 strcpy(the_command,console_buffer);
1050 flag_repeat = 1;
1051 }
1052 else {
1053 do_repeat = 1;
1054 }
1055 }
1056 i->p = the_command;
1057 }
1058 else {
wdenk8bde7f72003-06-27 21:31:46 +00001059 if (console_buffer[0] != '\n') {
1060 if (strlen(the_command) + strlen(console_buffer)
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02001061 < CONFIG_SYS_CBSIZE) {
wdenk8bde7f72003-06-27 21:31:46 +00001062 n = strlen(the_command);
1063 the_command[n-1] = ' ';
1064 strcpy(&the_command[n],console_buffer);
wdenkfe8c2802002-11-03 00:38:21 +00001065 }
1066 else {
1067 the_command[0] = '\n';
1068 the_command[1] = '\0';
1069 flag_repeat = 0;
1070 }
1071 }
1072 if (i->__promptme == 0) {
1073 the_command[0] = '\n';
1074 the_command[1] = '\0';
1075 }
1076 i->p = console_buffer;
1077 }
1078#endif
1079}
1080
1081/* This is the magic location that prints prompts
1082 * and gets data back from the user */
1083static int file_get(struct in_str *i)
1084{
1085 int ch;
1086
1087 ch = 0;
1088 /* If there is data waiting, eat it up */
1089 if (i->p && *i->p) {
Wolfgang Denkd0ff51b2008-07-14 15:19:07 +02001090 ch = *i->p++;
wdenkfe8c2802002-11-03 00:38:21 +00001091 } else {
1092 /* need to double check i->file because we might be doing something
1093 * more complicated by now, like sourcing or substituting. */
1094#ifndef __U_BOOT__
1095 if (i->__promptme && interactive && i->file == stdin) {
1096 while(! i->p || (interactive && strlen(i->p)==0) ) {
1097#else
1098 while(! i->p || strlen(i->p)==0 ) {
1099#endif
1100 get_user_input(i);
1101 }
1102 i->promptmode=2;
1103#ifndef __U_BOOT__
1104 i->__promptme = 0;
1105#endif
1106 if (i->p && *i->p) {
Wolfgang Denkd0ff51b2008-07-14 15:19:07 +02001107 ch = *i->p++;
wdenkfe8c2802002-11-03 00:38:21 +00001108 }
1109#ifndef __U_BOOT__
1110 } else {
1111 ch = fgetc(i->file);
1112 }
1113
1114#endif
1115 debug_printf("b_getch: got a %d\n", ch);
1116 }
1117#ifndef __U_BOOT__
1118 if (ch == '\n') i->__promptme=1;
1119#endif
1120 return ch;
1121}
1122
1123/* All the callers guarantee this routine will never be
1124 * used right after a newline, so prompting is not needed.
1125 */
1126static int file_peek(struct in_str *i)
1127{
1128#ifndef __U_BOOT__
1129 if (i->p && *i->p) {
1130#endif
1131 return *i->p;
1132#ifndef __U_BOOT__
1133 } else {
1134 i->peek_buf[0] = fgetc(i->file);
1135 i->peek_buf[1] = '\0';
1136 i->p = i->peek_buf;
1137 debug_printf("b_peek: got a %d\n", *i->p);
1138 return *i->p;
1139 }
1140#endif
1141}
1142
1143#ifndef __U_BOOT__
1144static void setup_file_in_str(struct in_str *i, FILE *f)
1145#else
1146static void setup_file_in_str(struct in_str *i)
1147#endif
1148{
1149 i->peek = file_peek;
1150 i->get = file_get;
1151 i->__promptme=1;
1152 i->promptmode=1;
1153#ifndef __U_BOOT__
1154 i->file = f;
1155#endif
1156 i->p = NULL;
1157}
1158
1159static void setup_string_in_str(struct in_str *i, const char *s)
1160{
1161 i->peek = static_peek;
1162 i->get = static_get;
1163 i->__promptme=1;
1164 i->promptmode=1;
1165 i->p = s;
1166}
1167
1168#ifndef __U_BOOT__
1169static void mark_open(int fd)
1170{
1171 struct close_me *new = xmalloc(sizeof(struct close_me));
1172 new->fd = fd;
1173 new->next = close_me_head;
1174 close_me_head = new;
1175}
1176
1177static void mark_closed(int fd)
1178{
1179 struct close_me *tmp;
1180 if (close_me_head == NULL || close_me_head->fd != fd)
1181 error_msg_and_die("corrupt close_me");
1182 tmp = close_me_head;
1183 close_me_head = close_me_head->next;
1184 free(tmp);
1185}
1186
wdenkd0fb80c2003-01-11 09:48:40 +00001187static void close_all(void)
wdenkfe8c2802002-11-03 00:38:21 +00001188{
1189 struct close_me *c;
1190 for (c=close_me_head; c; c=c->next) {
1191 close(c->fd);
1192 }
1193 close_me_head = NULL;
1194}
1195
1196/* squirrel != NULL means we squirrel away copies of stdin, stdout,
1197 * and stderr if they are redirected. */
1198static int setup_redirects(struct child_prog *prog, int squirrel[])
1199{
1200 int openfd, mode;
1201 struct redir_struct *redir;
1202
1203 for (redir=prog->redirects; redir; redir=redir->next) {
1204 if (redir->dup == -1 && redir->word.gl_pathv == NULL) {
1205 /* something went wrong in the parse. Pretend it didn't happen */
1206 continue;
1207 }
1208 if (redir->dup == -1) {
1209 mode=redir_table[redir->type].mode;
1210 openfd = open(redir->word.gl_pathv[0], mode, 0666);
1211 if (openfd < 0) {
1212 /* this could get lost if stderr has been redirected, but
1213 bash and ash both lose it as well (though zsh doesn't!) */
1214 perror_msg("error opening %s", redir->word.gl_pathv[0]);
1215 return 1;
1216 }
1217 } else {
1218 openfd = redir->dup;
1219 }
1220
1221 if (openfd != redir->fd) {
1222 if (squirrel && redir->fd < 3) {
1223 squirrel[redir->fd] = dup(redir->fd);
1224 }
1225 if (openfd == -3) {
1226 close(openfd);
1227 } else {
1228 dup2(openfd, redir->fd);
1229 if (redir->dup == -1)
1230 close (openfd);
1231 }
1232 }
1233 }
1234 return 0;
1235}
1236
1237static void restore_redirects(int squirrel[])
1238{
1239 int i, fd;
1240 for (i=0; i<3; i++) {
1241 fd = squirrel[i];
1242 if (fd != -1) {
1243 /* No error checking. I sure wouldn't know what
1244 * to do with an error if I found one! */
1245 dup2(fd, i);
1246 close(fd);
1247 }
1248 }
1249}
1250
1251/* never returns */
1252/* XXX no exit() here. If you don't exec, use _exit instead.
1253 * The at_exit handlers apparently confuse the calling process,
1254 * in particular stdin handling. Not sure why? */
1255static void pseudo_exec(struct child_prog *child)
1256{
1257 int i, rcode;
1258 char *p;
1259 struct built_in_command *x;
1260 if (child->argv) {
1261 for (i=0; is_assignment(child->argv[i]); i++) {
1262 debug_printf("pid %d environment modification: %s\n",getpid(),child->argv[i]);
1263 p = insert_var_value(child->argv[i]);
1264 putenv(strdup(p));
1265 if (p != child->argv[i]) free(p);
1266 }
1267 child->argv+=i; /* XXX this hack isn't so horrible, since we are about
wdenk8bde7f72003-06-27 21:31:46 +00001268 to exit, and therefore don't need to keep data
1269 structures consistent for free() use. */
wdenkfe8c2802002-11-03 00:38:21 +00001270 /* If a variable is assigned in a forest, and nobody listens,
1271 * was it ever really set?
1272 */
1273 if (child->argv[0] == NULL) {
1274 _exit(EXIT_SUCCESS);
1275 }
1276
1277 /*
1278 * Check if the command matches any of the builtins.
1279 * Depending on context, this might be redundant. But it's
1280 * easier to waste a few CPU cycles than it is to figure out
1281 * if this is one of those cases.
1282 */
1283 for (x = bltins; x->cmd; x++) {
1284 if (strcmp(child->argv[0], x->cmd) == 0 ) {
1285 debug_printf("builtin exec %s\n", child->argv[0]);
1286 rcode = x->function(child);
1287 fflush(stdout);
1288 _exit(rcode);
1289 }
1290 }
1291
1292 /* Check if the command matches any busybox internal commands
1293 * ("applets") here.
1294 * FIXME: This feature is not 100% safe, since
1295 * BusyBox is not fully reentrant, so we have no guarantee the things
1296 * from the .bss are still zeroed, or that things from .data are still
1297 * at their defaults. We could exec ourself from /proc/self/exe, but I
1298 * really dislike relying on /proc for things. We could exec ourself
1299 * from global_argv[0], but if we are in a chroot, we may not be able
1300 * to find ourself... */
wdenkd0fb80c2003-01-11 09:48:40 +00001301#ifdef CONFIG_FEATURE_SH_STANDALONE_SHELL
wdenkfe8c2802002-11-03 00:38:21 +00001302 {
1303 int argc_l;
1304 char** argv_l=child->argv;
1305 char *name = child->argv[0];
1306
wdenkd0fb80c2003-01-11 09:48:40 +00001307#ifdef CONFIG_FEATURE_SH_APPLETS_ALWAYS_WIN
wdenkfe8c2802002-11-03 00:38:21 +00001308 /* Following discussions from November 2000 on the busybox mailing
1309 * list, the default configuration, (without
1310 * get_last_path_component()) lets the user force use of an
1311 * external command by specifying the full (with slashes) filename.
wdenkd0fb80c2003-01-11 09:48:40 +00001312 * If you enable CONFIG_FEATURE_SH_APPLETS_ALWAYS_WIN then applets
wdenkfe8c2802002-11-03 00:38:21 +00001313 * _aways_ override external commands, so if you want to run
1314 * /bin/cat, it will use BusyBox cat even if /bin/cat exists on the
1315 * filesystem and is _not_ busybox. Some systems may want this,
1316 * most do not. */
1317 name = get_last_path_component(name);
1318#endif
1319 /* Count argc for use in a second... */
1320 for(argc_l=0;*argv_l!=NULL; argv_l++, argc_l++);
1321 optind = 1;
1322 debug_printf("running applet %s\n", name);
1323 run_applet_by_name(name, argc_l, child->argv);
1324 }
1325#endif
1326 debug_printf("exec of %s\n",child->argv[0]);
1327 execvp(child->argv[0],child->argv);
1328 perror_msg("couldn't exec: %s",child->argv[0]);
1329 _exit(1);
1330 } else if (child->group) {
1331 debug_printf("runtime nesting to group\n");
1332 interactive=0; /* crucial!!!! */
1333 rcode = run_list_real(child->group);
1334 /* OK to leak memory by not calling free_pipe_list,
1335 * since this process is about to exit */
1336 _exit(rcode);
1337 } else {
1338 /* Can happen. See what bash does with ">foo" by itself. */
1339 debug_printf("trying to pseudo_exec null command\n");
1340 _exit(EXIT_SUCCESS);
1341 }
1342}
1343
1344static void insert_bg_job(struct pipe *pi)
1345{
1346 struct pipe *thejob;
1347
1348 /* Linear search for the ID of the job to use */
1349 pi->jobid = 1;
1350 for (thejob = job_list; thejob; thejob = thejob->next)
1351 if (thejob->jobid >= pi->jobid)
1352 pi->jobid = thejob->jobid + 1;
1353
1354 /* add thejob to the list of running jobs */
1355 if (!job_list) {
1356 thejob = job_list = xmalloc(sizeof(*thejob));
1357 } else {
1358 for (thejob = job_list; thejob->next; thejob = thejob->next) /* nothing */;
1359 thejob->next = xmalloc(sizeof(*thejob));
1360 thejob = thejob->next;
1361 }
1362
1363 /* physically copy the struct job */
1364 memcpy(thejob, pi, sizeof(struct pipe));
1365 thejob->next = NULL;
1366 thejob->running_progs = thejob->num_progs;
1367 thejob->stopped_progs = 0;
1368 thejob->text = xmalloc(BUFSIZ); /* cmdedit buffer size */
1369
1370 /*if (pi->progs[0] && pi->progs[0].argv && pi->progs[0].argv[0]) */
1371 {
1372 char *bar=thejob->text;
1373 char **foo=pi->progs[0].argv;
1374 while(foo && *foo) {
1375 bar += sprintf(bar, "%s ", *foo++);
1376 }
1377 }
1378
1379 /* we don't wait for background thejobs to return -- append it
1380 to the list of backgrounded thejobs and leave it alone */
1381 printf("[%d] %d\n", thejob->jobid, thejob->progs[0].pid);
1382 last_bg_pid = thejob->progs[0].pid;
1383 last_jobid = thejob->jobid;
1384}
1385
1386/* remove a backgrounded job */
1387static void remove_bg_job(struct pipe *pi)
1388{
1389 struct pipe *prev_pipe;
1390
1391 if (pi == job_list) {
1392 job_list = pi->next;
1393 } else {
1394 prev_pipe = job_list;
1395 while (prev_pipe->next != pi)
1396 prev_pipe = prev_pipe->next;
1397 prev_pipe->next = pi->next;
1398 }
1399 if (job_list)
1400 last_jobid = job_list->jobid;
1401 else
1402 last_jobid = 0;
1403
1404 pi->stopped_progs = 0;
1405 free_pipe(pi, 0);
1406 free(pi);
1407}
1408
1409/* Checks to see if any processes have exited -- if they
1410 have, figure out why and see if a job has completed */
1411static int checkjobs(struct pipe* fg_pipe)
1412{
1413 int attributes;
1414 int status;
1415 int prognum = 0;
1416 struct pipe *pi;
1417 pid_t childpid;
1418
1419 attributes = WUNTRACED;
1420 if (fg_pipe==NULL) {
1421 attributes |= WNOHANG;
1422 }
1423
1424 while ((childpid = waitpid(-1, &status, attributes)) > 0) {
1425 if (fg_pipe) {
1426 int i, rcode = 0;
1427 for (i=0; i < fg_pipe->num_progs; i++) {
1428 if (fg_pipe->progs[i].pid == childpid) {
1429 if (i==fg_pipe->num_progs-1)
1430 rcode=WEXITSTATUS(status);
1431 (fg_pipe->num_progs)--;
1432 return(rcode);
1433 }
1434 }
1435 }
1436
1437 for (pi = job_list; pi; pi = pi->next) {
1438 prognum = 0;
1439 while (prognum < pi->num_progs && pi->progs[prognum].pid != childpid) {
1440 prognum++;
1441 }
1442 if (prognum < pi->num_progs)
1443 break;
1444 }
1445
1446 if(pi==NULL) {
1447 debug_printf("checkjobs: pid %d was not in our list!\n", childpid);
1448 continue;
1449 }
1450
1451 if (WIFEXITED(status) || WIFSIGNALED(status)) {
1452 /* child exited */
1453 pi->running_progs--;
1454 pi->progs[prognum].pid = 0;
1455
1456 if (!pi->running_progs) {
1457 printf(JOB_STATUS_FORMAT, pi->jobid, "Done", pi->text);
1458 remove_bg_job(pi);
1459 }
1460 } else {
1461 /* child stopped */
1462 pi->stopped_progs++;
1463 pi->progs[prognum].is_stopped = 1;
1464
1465#if 0
1466 /* Printing this stuff is a pain, since it tends to
1467 * overwrite the prompt an inconveinient moments. So
1468 * don't do that. */
1469 if (pi->stopped_progs == pi->num_progs) {
1470 printf("\n"JOB_STATUS_FORMAT, pi->jobid, "Stopped", pi->text);
1471 }
1472#endif
1473 }
1474 }
1475
1476 if (childpid == -1 && errno != ECHILD)
1477 perror_msg("waitpid");
1478
1479 /* move the shell to the foreground */
1480 /*if (interactive && tcsetpgrp(shell_terminal, getpgid(0))) */
1481 /* perror_msg("tcsetpgrp-2"); */
1482 return -1;
1483}
1484
1485/* Figure out our controlling tty, checking in order stderr,
1486 * stdin, and stdout. If check_pgrp is set, also check that
1487 * we belong to the foreground process group associated with
1488 * that tty. The value of shell_terminal is needed in order to call
1489 * tcsetpgrp(shell_terminal, ...); */
1490void controlling_tty(int check_pgrp)
1491{
1492 pid_t curpgrp;
1493
1494 if ((curpgrp = tcgetpgrp(shell_terminal = 2)) < 0
1495 && (curpgrp = tcgetpgrp(shell_terminal = 0)) < 0
1496 && (curpgrp = tcgetpgrp(shell_terminal = 1)) < 0)
1497 goto shell_terminal_error;
1498
1499 if (check_pgrp && curpgrp != getpgid(0))
1500 goto shell_terminal_error;
1501
1502 return;
1503
1504shell_terminal_error:
1505 shell_terminal = -1;
1506 return;
1507}
1508#endif
1509
1510/* run_pipe_real() starts all the jobs, but doesn't wait for anything
1511 * to finish. See checkjobs().
1512 *
1513 * return code is normally -1, when the caller has to wait for children
1514 * to finish to determine the exit status of the pipe. If the pipe
1515 * is a simple builtin command, however, the action is done by the
1516 * time run_pipe_real returns, and the exit code is provided as the
1517 * return value.
1518 *
1519 * The input of the pipe is always stdin, the output is always
1520 * stdout. The outpipe[] mechanism in BusyBox-0.48 lash is bogus,
1521 * because it tries to avoid running the command substitution in
1522 * subshell, when that is in fact necessary. The subshell process
1523 * now has its stdout directed to the input of the appropriate pipe,
1524 * so this routine is noticeably simpler.
1525 */
1526static int run_pipe_real(struct pipe *pi)
1527{
1528 int i;
1529#ifndef __U_BOOT__
1530 int nextin, nextout;
1531 int pipefds[2]; /* pipefds[0] is for reading */
1532 struct child_prog *child;
1533 struct built_in_command *x;
1534 char *p;
wdenkd0fb80c2003-01-11 09:48:40 +00001535# if __GNUC__
1536 /* Avoid longjmp clobbering */
1537 (void) &i;
1538 (void) &nextin;
1539 (void) &nextout;
1540 (void) &child;
1541# endif
wdenkfe8c2802002-11-03 00:38:21 +00001542#else
1543 int nextin;
1544 int flag = do_repeat ? CMD_FLAG_REPEAT : 0;
1545 struct child_prog *child;
wdenkfe8c2802002-11-03 00:38:21 +00001546 char *p;
wdenkd0fb80c2003-01-11 09:48:40 +00001547# if __GNUC__
1548 /* Avoid longjmp clobbering */
1549 (void) &i;
1550 (void) &nextin;
1551 (void) &child;
1552# endif
1553#endif /* __U_BOOT__ */
wdenkfe8c2802002-11-03 00:38:21 +00001554
1555 nextin = 0;
1556#ifndef __U_BOOT__
1557 pi->pgrp = -1;
1558#endif
1559
1560 /* Check if this is a simple builtin (not part of a pipe).
1561 * Builtins within pipes have to fork anyway, and are handled in
1562 * pseudo_exec. "echo foo | read bar" doesn't work on bash, either.
1563 */
1564 if (pi->num_progs == 1) child = & (pi->progs[0]);
1565#ifndef __U_BOOT__
1566 if (pi->num_progs == 1 && child->group && child->subshell == 0) {
1567 int squirrel[] = {-1, -1, -1};
1568 int rcode;
1569 debug_printf("non-subshell grouping\n");
1570 setup_redirects(child, squirrel);
1571 /* XXX could we merge code with following builtin case,
1572 * by creating a pseudo builtin that calls run_list_real? */
1573 rcode = run_list_real(child->group);
1574 restore_redirects(squirrel);
1575#else
1576 if (pi->num_progs == 1 && child->group) {
1577 int rcode;
1578 debug_printf("non-subshell grouping\n");
1579 rcode = run_list_real(child->group);
1580#endif
1581 return rcode;
1582 } else if (pi->num_progs == 1 && pi->progs[0].argv != NULL) {
1583 for (i=0; is_assignment(child->argv[i]); i++) { /* nothing */ }
1584 if (i!=0 && child->argv[i]==NULL) {
1585 /* assignments, but no command: set the local environment */
1586 for (i=0; child->argv[i]!=NULL; i++) {
1587
1588 /* Ok, this case is tricky. We have to decide if this is a
1589 * local variable, or an already exported variable. If it is
1590 * already exported, we have to export the new value. If it is
1591 * not exported, we need only set this as a local variable.
1592 * This junk is all to decide whether or not to export this
1593 * variable. */
1594 int export_me=0;
1595 char *name, *value;
1596 name = xstrdup(child->argv[i]);
1597 debug_printf("Local environment set: %s\n", name);
1598 value = strchr(name, '=');
1599 if (value)
1600 *value=0;
1601#ifndef __U_BOOT__
1602 if ( get_local_var(name)) {
1603 export_me=1;
1604 }
1605#endif
1606 free(name);
1607 p = insert_var_value(child->argv[i]);
1608 set_local_var(p, export_me);
1609 if (p != child->argv[i]) free(p);
1610 }
1611 return EXIT_SUCCESS; /* don't worry about errors in set_local_var() yet */
1612 }
1613 for (i = 0; is_assignment(child->argv[i]); i++) {
1614 p = insert_var_value(child->argv[i]);
1615#ifndef __U_BOOT__
1616 putenv(strdup(p));
1617#else
1618 set_local_var(p, 0);
1619#endif
1620 if (p != child->argv[i]) {
1621 child->sp--;
1622 free(p);
1623 }
1624 }
1625 if (child->sp) {
1626 char * str = NULL;
1627
1628 str = make_string((child->argv + i));
1629 parse_string_outer(str, FLAG_EXIT_FROM_LOOP | FLAG_REPARSING);
1630 free(str);
1631 return last_return_code;
1632 }
1633#ifndef __U_BOOT__
1634 for (x = bltins; x->cmd; x++) {
1635 if (strcmp(child->argv[i], x->cmd) == 0 ) {
1636 int squirrel[] = {-1, -1, -1};
1637 int rcode;
1638 if (x->function == builtin_exec && child->argv[i+1]==NULL) {
1639 debug_printf("magic exec\n");
1640 setup_redirects(child,NULL);
1641 return EXIT_SUCCESS;
1642 }
1643 debug_printf("builtin inline %s\n", child->argv[0]);
1644 /* XXX setup_redirects acts on file descriptors, not FILEs.
1645 * This is perfect for work that comes after exec().
1646 * Is it really safe for inline use? Experimentally,
1647 * things seem to work with glibc. */
1648 setup_redirects(child, squirrel);
Simon Glass7344f912011-12-06 19:47:53 +00001649
1650 child->argv += i; /* XXX horrible hack */
1651 rcode = x->function(child);
1652 /* XXX restore hack so free() can work right */
1653 child->argv -= i;
1654 restore_redirects(squirrel);
1655 }
1656 return rcode;
1657 }
wdenkfe8c2802002-11-03 00:38:21 +00001658#else
Simon Glass9d12d5d2012-02-14 19:59:25 +00001659 /* check ";", because ,example , argv consist from
1660 * "help;flinfo" must not execute
1661 */
1662 if (strchr(child->argv[i], ';')) {
1663 printf("Unknown command '%s' - try 'help' or use "
1664 "'run' command\n", child->argv[i]);
1665 return -1;
wdenkfe8c2802002-11-03 00:38:21 +00001666 }
Simon Glass9d12d5d2012-02-14 19:59:25 +00001667 /* Process the command */
1668 return cmd_process(flag, child->argc, child->argv,
1669 &flag_repeat);
1670#endif
wdenkfe8c2802002-11-03 00:38:21 +00001671 }
Simon Glass9d12d5d2012-02-14 19:59:25 +00001672#ifndef __U_BOOT__
wdenkfe8c2802002-11-03 00:38:21 +00001673
1674 for (i = 0; i < pi->num_progs; i++) {
1675 child = & (pi->progs[i]);
1676
1677 /* pipes are inserted between pairs of commands */
1678 if ((i + 1) < pi->num_progs) {
1679 if (pipe(pipefds)<0) perror_msg_and_die("pipe");
1680 nextout = pipefds[1];
1681 } else {
1682 nextout=1;
1683 pipefds[0] = -1;
1684 }
1685
1686 /* XXX test for failed fork()? */
1687 if (!(child->pid = fork())) {
1688 /* Set the handling for job control signals back to the default. */
1689 signal(SIGINT, SIG_DFL);
1690 signal(SIGQUIT, SIG_DFL);
1691 signal(SIGTERM, SIG_DFL);
1692 signal(SIGTSTP, SIG_DFL);
1693 signal(SIGTTIN, SIG_DFL);
1694 signal(SIGTTOU, SIG_DFL);
1695 signal(SIGCHLD, SIG_DFL);
1696
1697 close_all();
1698
1699 if (nextin != 0) {
1700 dup2(nextin, 0);
1701 close(nextin);
1702 }
1703 if (nextout != 1) {
1704 dup2(nextout, 1);
1705 close(nextout);
1706 }
1707 if (pipefds[0]!=-1) {
1708 close(pipefds[0]); /* opposite end of our output pipe */
1709 }
1710
1711 /* Like bash, explicit redirects override pipes,
1712 * and the pipe fd is available for dup'ing. */
1713 setup_redirects(child,NULL);
1714
1715 if (interactive && pi->followup!=PIPE_BG) {
1716 /* If we (the child) win the race, put ourselves in the process
1717 * group whose leader is the first process in this pipe. */
1718 if (pi->pgrp < 0) {
1719 pi->pgrp = getpid();
1720 }
1721 if (setpgid(0, pi->pgrp) == 0) {
1722 tcsetpgrp(2, pi->pgrp);
1723 }
1724 }
1725
1726 pseudo_exec(child);
1727 }
1728
1729
1730 /* put our child in the process group whose leader is the
1731 first process in this pipe */
1732 if (pi->pgrp < 0) {
1733 pi->pgrp = child->pid;
1734 }
1735 /* Don't check for errors. The child may be dead already,
1736 * in which case setpgid returns error code EACCES. */
1737 setpgid(child->pid, pi->pgrp);
1738
1739 if (nextin != 0)
1740 close(nextin);
1741 if (nextout != 1)
1742 close(nextout);
1743
1744 /* If there isn't another process, nextin is garbage
1745 but it doesn't matter */
1746 nextin = pipefds[0];
1747 }
1748#endif
1749 return -1;
1750}
1751
1752static int run_list_real(struct pipe *pi)
1753{
1754 char *save_name = NULL;
1755 char **list = NULL;
1756 char **save_list = NULL;
1757 struct pipe *rpipe;
1758 int flag_rep = 0;
1759#ifndef __U_BOOT__
1760 int save_num_progs;
1761#endif
1762 int rcode=0, flag_skip=1;
1763 int flag_restore = 0;
1764 int if_code=0, next_if_code=0; /* need double-buffer to handle elif */
1765 reserved_style rmode, skip_more_in_this_rmode=RES_XXXX;
1766 /* check syntax for "for" */
1767 for (rpipe = pi; rpipe; rpipe = rpipe->next) {
1768 if ((rpipe->r_mode == RES_IN ||
1769 rpipe->r_mode == RES_FOR) &&
1770 (rpipe->next == NULL)) {
1771 syntax();
1772#ifdef __U_BOOT__
1773 flag_repeat = 0;
1774#endif
1775 return 1;
1776 }
1777 if ((rpipe->r_mode == RES_IN &&
1778 (rpipe->next->r_mode == RES_IN &&
1779 rpipe->next->progs->argv != NULL))||
1780 (rpipe->r_mode == RES_FOR &&
1781 rpipe->next->r_mode != RES_IN)) {
1782 syntax();
1783#ifdef __U_BOOT__
1784 flag_repeat = 0;
1785#endif
1786 return 1;
1787 }
1788 }
1789 for (; pi; pi = (flag_restore != 0) ? rpipe : pi->next) {
1790 if (pi->r_mode == RES_WHILE || pi->r_mode == RES_UNTIL ||
1791 pi->r_mode == RES_FOR) {
1792#ifdef __U_BOOT__
1793 /* check Ctrl-C */
1794 ctrlc();
1795 if ((had_ctrlc())) {
1796 return 1;
1797 }
1798#endif
1799 flag_restore = 0;
1800 if (!rpipe) {
1801 flag_rep = 0;
1802 rpipe = pi;
1803 }
1804 }
1805 rmode = pi->r_mode;
1806 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);
1807 if (rmode == skip_more_in_this_rmode && flag_skip) {
1808 if (pi->followup == PIPE_SEQ) flag_skip=0;
1809 continue;
1810 }
1811 flag_skip = 1;
1812 skip_more_in_this_rmode = RES_XXXX;
1813 if (rmode == RES_THEN || rmode == RES_ELSE) if_code = next_if_code;
1814 if (rmode == RES_THEN && if_code) continue;
1815 if (rmode == RES_ELSE && !if_code) continue;
wdenk56b86bf2004-04-12 14:31:43 +00001816 if (rmode == RES_ELIF && !if_code) break;
wdenkfe8c2802002-11-03 00:38:21 +00001817 if (rmode == RES_FOR && pi->num_progs) {
1818 if (!list) {
1819 /* if no variable values after "in" we skip "for" */
1820 if (!pi->next->progs->argv) continue;
1821 /* create list of variable values */
1822 list = make_list_in(pi->next->progs->argv,
1823 pi->progs->argv[0]);
1824 save_list = list;
1825 save_name = pi->progs->argv[0];
1826 pi->progs->argv[0] = NULL;
1827 flag_rep = 1;
1828 }
1829 if (!(*list)) {
1830 free(pi->progs->argv[0]);
1831 free(save_list);
1832 list = NULL;
1833 flag_rep = 0;
1834 pi->progs->argv[0] = save_name;
1835#ifndef __U_BOOT__
1836 pi->progs->glob_result.gl_pathv[0] =
1837 pi->progs->argv[0];
1838#endif
1839 continue;
1840 } else {
1841 /* insert new value from list for variable */
1842 if (pi->progs->argv[0])
1843 free(pi->progs->argv[0]);
1844 pi->progs->argv[0] = *list++;
1845#ifndef __U_BOOT__
1846 pi->progs->glob_result.gl_pathv[0] =
1847 pi->progs->argv[0];
1848#endif
1849 }
1850 }
1851 if (rmode == RES_IN) continue;
1852 if (rmode == RES_DO) {
1853 if (!flag_rep) continue;
1854 }
1855 if ((rmode == RES_DONE)) {
1856 if (flag_rep) {
1857 flag_restore = 1;
1858 } else {
1859 rpipe = NULL;
1860 }
1861 }
1862 if (pi->num_progs == 0) continue;
1863#ifndef __U_BOOT__
1864 save_num_progs = pi->num_progs; /* save number of programs */
1865#endif
1866 rcode = run_pipe_real(pi);
1867 debug_printf("run_pipe_real returned %d\n",rcode);
1868#ifndef __U_BOOT__
1869 if (rcode!=-1) {
1870 /* We only ran a builtin: rcode was set by the return value
1871 * of run_pipe_real(), and we don't need to wait for anything. */
1872 } else if (pi->followup==PIPE_BG) {
1873 /* XXX check bash's behavior with nontrivial pipes */
1874 /* XXX compute jobid */
1875 /* XXX what does bash do with attempts to background builtins? */
1876 insert_bg_job(pi);
1877 rcode = EXIT_SUCCESS;
1878 } else {
1879 if (interactive) {
1880 /* move the new process group into the foreground */
1881 if (tcsetpgrp(shell_terminal, pi->pgrp) && errno != ENOTTY)
1882 perror_msg("tcsetpgrp-3");
1883 rcode = checkjobs(pi);
1884 /* move the shell to the foreground */
1885 if (tcsetpgrp(shell_terminal, getpgid(0)) && errno != ENOTTY)
1886 perror_msg("tcsetpgrp-4");
1887 } else {
1888 rcode = checkjobs(pi);
1889 }
1890 debug_printf("checkjobs returned %d\n",rcode);
1891 }
1892 last_return_code=rcode;
1893#else
wdenkc26e4542004-04-18 10:13:26 +00001894 if (rcode < -1) {
1895 last_return_code = -rcode - 2;
1896 return -2; /* exit */
1897 }
wdenkfe8c2802002-11-03 00:38:21 +00001898 last_return_code=(rcode == 0) ? 0 : 1;
1899#endif
1900#ifndef __U_BOOT__
1901 pi->num_progs = save_num_progs; /* restore number of programs */
1902#endif
1903 if ( rmode == RES_IF || rmode == RES_ELIF )
1904 next_if_code=rcode; /* can be overwritten a number of times */
1905 if (rmode == RES_WHILE)
1906 flag_rep = !last_return_code;
1907 if (rmode == RES_UNTIL)
1908 flag_rep = last_return_code;
1909 if ( (rcode==EXIT_SUCCESS && pi->followup==PIPE_OR) ||
1910 (rcode!=EXIT_SUCCESS && pi->followup==PIPE_AND) )
1911 skip_more_in_this_rmode=rmode;
1912#ifndef __U_BOOT__
1913 checkjobs(NULL);
1914#endif
1915 }
1916 return rcode;
1917}
1918
1919/* broken, of course, but OK for testing */
1920static char *indenter(int i)
1921{
1922 static char blanks[]=" ";
1923 return &blanks[sizeof(blanks)-i-1];
1924}
1925
1926/* return code is the exit status of the pipe */
1927static int free_pipe(struct pipe *pi, int indent)
1928{
1929 char **p;
1930 struct child_prog *child;
1931#ifndef __U_BOOT__
1932 struct redir_struct *r, *rnext;
1933#endif
1934 int a, i, ret_code=0;
1935 char *ind = indenter(indent);
1936
1937#ifndef __U_BOOT__
1938 if (pi->stopped_progs > 0)
1939 return ret_code;
1940 final_printf("%s run pipe: (pid %d)\n",ind,getpid());
1941#endif
1942 for (i=0; i<pi->num_progs; i++) {
1943 child = &pi->progs[i];
1944 final_printf("%s command %d:\n",ind,i);
1945 if (child->argv) {
1946 for (a=0,p=child->argv; *p; a++,p++) {
1947 final_printf("%s argv[%d] = %s\n",ind,a,*p);
1948 }
1949#ifndef __U_BOOT__
1950 globfree(&child->glob_result);
1951#else
Peter Tyser197324d2009-08-05 16:18:44 -05001952 for (a = 0; a < child->argc; a++) {
wdenk8bde7f72003-06-27 21:31:46 +00001953 free(child->argv[a]);
1954 }
wdenkfe8c2802002-11-03 00:38:21 +00001955 free(child->argv);
wdenk8bde7f72003-06-27 21:31:46 +00001956 child->argc = 0;
wdenkfe8c2802002-11-03 00:38:21 +00001957#endif
1958 child->argv=NULL;
1959 } else if (child->group) {
1960#ifndef __U_BOOT__
1961 final_printf("%s begin group (subshell:%d)\n",ind, child->subshell);
1962#endif
1963 ret_code = free_pipe_list(child->group,indent+3);
1964 final_printf("%s end group\n",ind);
1965 } else {
1966 final_printf("%s (nil)\n",ind);
1967 }
1968#ifndef __U_BOOT__
1969 for (r=child->redirects; r; r=rnext) {
1970 final_printf("%s redirect %d%s", ind, r->fd, redir_table[r->type].descrip);
1971 if (r->dup == -1) {
1972 /* guard against the case >$FOO, where foo is unset or blank */
1973 if (r->word.gl_pathv) {
1974 final_printf(" %s\n", *r->word.gl_pathv);
1975 globfree(&r->word);
1976 }
1977 } else {
1978 final_printf("&%d\n", r->dup);
1979 }
1980 rnext=r->next;
1981 free(r);
1982 }
1983 child->redirects=NULL;
1984#endif
1985 }
1986 free(pi->progs); /* children are an array, they get freed all at once */
1987 pi->progs=NULL;
1988 return ret_code;
1989}
1990
1991static int free_pipe_list(struct pipe *head, int indent)
1992{
1993 int rcode=0; /* if list has no members */
1994 struct pipe *pi, *next;
1995 char *ind = indenter(indent);
1996 for (pi=head; pi; pi=next) {
1997 final_printf("%s pipe reserved mode %d\n", ind, pi->r_mode);
1998 rcode = free_pipe(pi, indent);
1999 final_printf("%s pipe followup code %d\n", ind, pi->followup);
2000 next=pi->next;
2001 pi->next=NULL;
2002 free(pi);
2003 }
2004 return rcode;
2005}
2006
2007/* Select which version we will use */
2008static int run_list(struct pipe *pi)
2009{
2010 int rcode=0;
2011#ifndef __U_BOOT__
2012 if (fake_mode==0) {
2013#endif
2014 rcode = run_list_real(pi);
2015#ifndef __U_BOOT__
2016 }
2017#endif
2018 /* free_pipe_list has the side effect of clearing memory
2019 * In the long run that function can be merged with run_list_real,
2020 * but doing that now would hobble the debugging effort. */
2021 free_pipe_list(pi,0);
2022 return rcode;
2023}
2024
2025/* The API for glob is arguably broken. This routine pushes a non-matching
2026 * string into the output structure, removing non-backslashed backslashes.
2027 * If someone can prove me wrong, by performing this function within the
2028 * original glob(3) api, feel free to rewrite this routine into oblivion.
2029 * Return code (0 vs. GLOB_NOSPACE) matches glob(3).
2030 * XXX broken if the last character is '\\', check that before calling.
2031 */
2032#ifndef __U_BOOT__
2033static int globhack(const char *src, int flags, glob_t *pglob)
2034{
2035 int cnt=0, pathc;
2036 const char *s;
2037 char *dest;
2038 for (cnt=1, s=src; s && *s; s++) {
2039 if (*s == '\\') s++;
2040 cnt++;
2041 }
2042 dest = malloc(cnt);
2043 if (!dest) return GLOB_NOSPACE;
2044 if (!(flags & GLOB_APPEND)) {
2045 pglob->gl_pathv=NULL;
2046 pglob->gl_pathc=0;
2047 pglob->gl_offs=0;
2048 pglob->gl_offs=0;
2049 }
2050 pathc = ++pglob->gl_pathc;
2051 pglob->gl_pathv = realloc(pglob->gl_pathv, (pathc+1)*sizeof(*pglob->gl_pathv));
2052 if (pglob->gl_pathv == NULL) return GLOB_NOSPACE;
2053 pglob->gl_pathv[pathc-1]=dest;
2054 pglob->gl_pathv[pathc]=NULL;
2055 for (s=src; s && *s; s++, dest++) {
2056 if (*s == '\\') s++;
2057 *dest = *s;
2058 }
2059 *dest='\0';
2060 return 0;
2061}
2062
2063/* XXX broken if the last character is '\\', check that before calling */
2064static int glob_needed(const char *s)
2065{
2066 for (; *s; s++) {
2067 if (*s == '\\') s++;
2068 if (strchr("*[?",*s)) return 1;
2069 }
2070 return 0;
2071}
2072
2073#if 0
2074static void globprint(glob_t *pglob)
2075{
2076 int i;
2077 debug_printf("glob_t at %p:\n", pglob);
2078 debug_printf(" gl_pathc=%d gl_pathv=%p gl_offs=%d gl_flags=%d\n",
2079 pglob->gl_pathc, pglob->gl_pathv, pglob->gl_offs, pglob->gl_flags);
2080 for (i=0; i<pglob->gl_pathc; i++)
2081 debug_printf("pglob->gl_pathv[%d] = %p = %s\n", i,
2082 pglob->gl_pathv[i], pglob->gl_pathv[i]);
2083}
2084#endif
2085
2086static int xglob(o_string *dest, int flags, glob_t *pglob)
2087{
2088 int gr;
2089
wdenk8bde7f72003-06-27 21:31:46 +00002090 /* short-circuit for null word */
wdenkfe8c2802002-11-03 00:38:21 +00002091 /* we can code this better when the debug_printf's are gone */
wdenk8bde7f72003-06-27 21:31:46 +00002092 if (dest->length == 0) {
2093 if (dest->nonnull) {
2094 /* bash man page calls this an "explicit" null */
2095 gr = globhack(dest->data, flags, pglob);
2096 debug_printf("globhack returned %d\n",gr);
2097 } else {
wdenkfe8c2802002-11-03 00:38:21 +00002098 return 0;
2099 }
wdenk8bde7f72003-06-27 21:31:46 +00002100 } else if (glob_needed(dest->data)) {
wdenkfe8c2802002-11-03 00:38:21 +00002101 gr = glob(dest->data, flags, NULL, pglob);
2102 debug_printf("glob returned %d\n",gr);
2103 if (gr == GLOB_NOMATCH) {
2104 /* quote removal, or more accurately, backslash removal */
2105 gr = globhack(dest->data, flags, pglob);
2106 debug_printf("globhack returned %d\n",gr);
2107 }
2108 } else {
2109 gr = globhack(dest->data, flags, pglob);
2110 debug_printf("globhack returned %d\n",gr);
2111 }
2112 if (gr == GLOB_NOSPACE)
2113 error_msg_and_die("out of memory during glob");
2114 if (gr != 0) { /* GLOB_ABORTED ? */
2115 error_msg("glob(3) error %d",gr);
2116 }
2117 /* globprint(glob_target); */
2118 return gr;
2119}
2120#endif
2121
wdenkc26e4542004-04-18 10:13:26 +00002122#ifdef __U_BOOT__
2123static char *get_dollar_var(char ch);
2124#endif
2125
wdenkfe8c2802002-11-03 00:38:21 +00002126/* This is used to get/check local shell variables */
Holger Brunckeae3b062011-04-08 02:47:42 +00002127char *get_local_var(const char *s)
wdenkfe8c2802002-11-03 00:38:21 +00002128{
2129 struct variables *cur;
2130
2131 if (!s)
2132 return NULL;
wdenkc26e4542004-04-18 10:13:26 +00002133
2134#ifdef __U_BOOT__
2135 if (*s == '$')
2136 return get_dollar_var(s[1]);
2137#endif
2138
wdenkfe8c2802002-11-03 00:38:21 +00002139 for (cur = top_vars; cur; cur=cur->next)
2140 if(strcmp(cur->name, s)==0)
2141 return cur->value;
2142 return NULL;
2143}
2144
2145/* This is used to set local shell variables
2146 flg_export==0 if only local (not exporting) variable
2147 flg_export==1 if "new" exporting environ
2148 flg_export>1 if current startup environ (not call putenv()) */
Heiko Schocher81473f62008-10-15 09:40:28 +02002149int set_local_var(const char *s, int flg_export)
wdenkfe8c2802002-11-03 00:38:21 +00002150{
2151 char *name, *value;
2152 int result=0;
2153 struct variables *cur;
2154
wdenkc26e4542004-04-18 10:13:26 +00002155#ifdef __U_BOOT__
2156 /* might be possible! */
2157 if (!isalpha(*s))
2158 return -1;
2159#endif
2160
wdenkfe8c2802002-11-03 00:38:21 +00002161 name=strdup(s);
2162
2163#ifdef __U_BOOT__
2164 if (getenv(name) != NULL) {
2165 printf ("ERROR: "
wdenk2d1a5372004-02-23 19:30:57 +00002166 "There is a global environment variable with the same name.\n");
wdenkc26e4542004-04-18 10:13:26 +00002167 free(name);
wdenkfe8c2802002-11-03 00:38:21 +00002168 return -1;
2169 }
2170#endif
2171 /* Assume when we enter this function that we are already in
2172 * NAME=VALUE format. So the first order of business is to
2173 * split 's' on the '=' into 'name' and 'value' */
2174 value = strchr(name, '=');
2175 if (value==0 && ++value==0) {
2176 free(name);
2177 return -1;
2178 }
2179 *value++ = 0;
2180
2181 for(cur = top_vars; cur; cur = cur->next) {
2182 if(strcmp(cur->name, name)==0)
2183 break;
2184 }
2185
2186 if(cur) {
2187 if(strcmp(cur->value, value)==0) {
2188 if(flg_export>0 && cur->flg_export==0)
2189 cur->flg_export=flg_export;
2190 else
2191 result++;
2192 } else {
2193 if(cur->flg_read_only) {
2194 error_msg("%s: readonly variable", name);
2195 result = -1;
2196 } else {
2197 if(flg_export>0 || cur->flg_export>1)
2198 cur->flg_export=1;
2199 free(cur->value);
2200
2201 cur->value = strdup(value);
2202 }
2203 }
2204 } else {
2205 cur = malloc(sizeof(struct variables));
2206 if(!cur) {
2207 result = -1;
2208 } else {
2209 cur->name = strdup(name);
2210 if(cur->name == 0) {
2211 free(cur);
2212 result = -1;
2213 } else {
2214 struct variables *bottom = top_vars;
2215 cur->value = strdup(value);
2216 cur->next = 0;
2217 cur->flg_export = flg_export;
2218 cur->flg_read_only = 0;
2219 while(bottom->next) bottom=bottom->next;
2220 bottom->next = cur;
2221 }
2222 }
2223 }
2224
2225#ifndef __U_BOOT__
2226 if(result==0 && cur->flg_export==1) {
2227 *(value-1) = '=';
2228 result = putenv(name);
2229 } else {
2230#endif
2231 free(name);
2232#ifndef __U_BOOT__
2233 if(result>0) /* equivalent to previous set */
2234 result = 0;
2235 }
2236#endif
2237 return result;
2238}
2239
Heiko Schocher81473f62008-10-15 09:40:28 +02002240void unset_local_var(const char *name)
wdenkfe8c2802002-11-03 00:38:21 +00002241{
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 {
Heiko Schocher81473f62008-10-15 09:40:28 +02002255#ifndef __U_BOOT__
wdenkfe8c2802002-11-03 00:38:21 +00002256 if(cur->flg_export)
2257 unsetenv(cur->name);
Heiko Schocher81473f62008-10-15 09:40:28 +02002258#endif
wdenkfe8c2802002-11-03 00:38:21 +00002259 free(cur->name);
2260 free(cur->value);
2261 while (next->next != cur)
2262 next = next->next;
2263 next->next = cur->next;
2264 }
2265 free(cur);
2266 }
2267 }
2268}
wdenkfe8c2802002-11-03 00:38:21 +00002269
2270static int is_assignment(const char *s)
2271{
wdenkc26e4542004-04-18 10:13:26 +00002272 if (s == NULL)
2273 return 0;
2274
2275 if (!isalpha(*s)) return 0;
wdenkfe8c2802002-11-03 00:38:21 +00002276 ++s;
2277 while(isalnum(*s) || *s=='_') ++s;
2278 return *s=='=';
2279}
2280
2281#ifndef __U_BOOT__
2282/* the src parameter allows us to peek forward to a possible &n syntax
2283 * for file descriptor duplication, e.g., "2>&1".
2284 * Return code is 0 normally, 1 if a syntax error is detected in src.
2285 * Resource errors (in xmalloc) cause the process to exit */
2286static int setup_redirect(struct p_context *ctx, int fd, redir_type style,
2287 struct in_str *input)
2288{
2289 struct child_prog *child=ctx->child;
2290 struct redir_struct *redir = child->redirects;
2291 struct redir_struct *last_redir=NULL;
2292
2293 /* Create a new redir_struct and drop it onto the end of the linked list */
2294 while(redir) {
2295 last_redir=redir;
2296 redir=redir->next;
2297 }
2298 redir = xmalloc(sizeof(struct redir_struct));
2299 redir->next=NULL;
2300 redir->word.gl_pathv=NULL;
2301 if (last_redir) {
2302 last_redir->next=redir;
2303 } else {
2304 child->redirects=redir;
2305 }
2306
2307 redir->type=style;
2308 redir->fd= (fd==-1) ? redir_table[style].default_fd : fd ;
2309
2310 debug_printf("Redirect type %d%s\n", redir->fd, redir_table[style].descrip);
2311
2312 /* Check for a '2>&1' type redirect */
2313 redir->dup = redirect_dup_num(input);
2314 if (redir->dup == -2) return 1; /* syntax error */
2315 if (redir->dup != -1) {
2316 /* Erik had a check here that the file descriptor in question
2317 * is legit; I postpone that to "run time"
2318 * A "-" representation of "close me" shows up as a -3 here */
2319 debug_printf("Duplicating redirect '%d>&%d'\n", redir->fd, redir->dup);
2320 } else {
2321 /* We do _not_ try to open the file that src points to,
2322 * since we need to return and let src be expanded first.
2323 * Set ctx->pending_redirect, so we know what to do at the
2324 * end of the next parsed word.
2325 */
2326 ctx->pending_redirect = redir;
2327 }
2328 return 0;
2329}
2330#endif
2331
2332struct pipe *new_pipe(void) {
2333 struct pipe *pi;
2334 pi = xmalloc(sizeof(struct pipe));
2335 pi->num_progs = 0;
2336 pi->progs = NULL;
2337 pi->next = NULL;
2338 pi->followup = 0; /* invalid */
Wolfgang Denke98f68b2005-09-28 01:49:47 +02002339 pi->r_mode = RES_NONE;
wdenkfe8c2802002-11-03 00:38:21 +00002340 return pi;
2341}
2342
2343static void initialize_context(struct p_context *ctx)
2344{
2345 ctx->pipe=NULL;
2346#ifndef __U_BOOT__
2347 ctx->pending_redirect=NULL;
2348#endif
2349 ctx->child=NULL;
2350 ctx->list_head=new_pipe();
2351 ctx->pipe=ctx->list_head;
2352 ctx->w=RES_NONE;
2353 ctx->stack=NULL;
2354#ifdef __U_BOOT__
2355 ctx->old_flag=0;
2356#endif
2357 done_command(ctx); /* creates the memory for working child */
2358}
2359
2360/* normal return is 0
2361 * if a reserved word is found, and processed, return 1
2362 * should handle if, then, elif, else, fi, for, while, until, do, done.
2363 * case, function, and select are obnoxious, save those for later.
2364 */
wdenk3e386912003-04-05 00:53:31 +00002365struct reserved_combo {
2366 char *literal;
2367 int code;
2368 long flag;
2369};
2370/* Mostly a list of accepted follow-up reserved words.
2371 * FLAG_END means we are done with the sequence, and are ready
2372 * to turn the compound list into a command.
2373 * FLAG_START means the word must start a new compound list.
2374 */
2375static struct reserved_combo reserved_list[] = {
2376 { "if", RES_IF, FLAG_THEN | FLAG_START },
2377 { "then", RES_THEN, FLAG_ELIF | FLAG_ELSE | FLAG_FI },
2378 { "elif", RES_ELIF, FLAG_THEN },
2379 { "else", RES_ELSE, FLAG_FI },
2380 { "fi", RES_FI, FLAG_END },
2381 { "for", RES_FOR, FLAG_IN | FLAG_START },
2382 { "while", RES_WHILE, FLAG_DO | FLAG_START },
2383 { "until", RES_UNTIL, FLAG_DO | FLAG_START },
2384 { "in", RES_IN, FLAG_DO },
2385 { "do", RES_DO, FLAG_DONE },
2386 { "done", RES_DONE, FLAG_END }
2387};
2388#define NRES (sizeof(reserved_list)/sizeof(struct reserved_combo))
2389
wdenkfe8c2802002-11-03 00:38:21 +00002390int reserved_word(o_string *dest, struct p_context *ctx)
2391{
wdenkfe8c2802002-11-03 00:38:21 +00002392 struct reserved_combo *r;
2393 for (r=reserved_list;
wdenkfe8c2802002-11-03 00:38:21 +00002394 r<reserved_list+NRES; r++) {
2395 if (strcmp(dest->data, r->literal) == 0) {
2396 debug_printf("found reserved word %s, code %d\n",r->literal,r->code);
2397 if (r->flag & FLAG_START) {
2398 struct p_context *new = xmalloc(sizeof(struct p_context));
2399 debug_printf("push stack\n");
2400 if (ctx->w == RES_IN || ctx->w == RES_FOR) {
2401 syntax();
2402 free(new);
2403 ctx->w = RES_SNTX;
2404 b_reset(dest);
2405 return 1;
2406 }
2407 *new = *ctx; /* physical copy */
2408 initialize_context(ctx);
2409 ctx->stack=new;
2410 } else if ( ctx->w == RES_NONE || ! (ctx->old_flag & (1<<r->code))) {
2411 syntax();
2412 ctx->w = RES_SNTX;
2413 b_reset(dest);
2414 return 1;
2415 }
2416 ctx->w=r->code;
2417 ctx->old_flag = r->flag;
2418 if (ctx->old_flag & FLAG_END) {
2419 struct p_context *old;
2420 debug_printf("pop stack\n");
2421 done_pipe(ctx,PIPE_SEQ);
2422 old = ctx->stack;
2423 old->child->group = ctx->list_head;
2424#ifndef __U_BOOT__
2425 old->child->subshell = 0;
2426#endif
2427 *ctx = *old; /* physical copy */
2428 free(old);
2429 }
2430 b_reset (dest);
2431 return 1;
2432 }
2433 }
2434 return 0;
2435}
2436
2437/* normal return is 0.
2438 * Syntax or xglob errors return 1. */
2439static int done_word(o_string *dest, struct p_context *ctx)
2440{
2441 struct child_prog *child=ctx->child;
2442#ifndef __U_BOOT__
2443 glob_t *glob_target;
2444 int gr, flags = 0;
2445#else
2446 char *str, *s;
2447 int argc, cnt;
2448#endif
2449
2450 debug_printf("done_word: %s %p\n", dest->data, child);
2451 if (dest->length == 0 && !dest->nonnull) {
2452 debug_printf(" true null, ignored\n");
2453 return 0;
2454 }
2455#ifndef __U_BOOT__
2456 if (ctx->pending_redirect) {
2457 glob_target = &ctx->pending_redirect->word;
2458 } else {
2459#endif
2460 if (child->group) {
2461 syntax();
2462 return 1; /* syntax error, groups and arglists don't mix */
2463 }
2464 if (!child->argv && (ctx->type & FLAG_PARSE_SEMICOLON)) {
2465 debug_printf("checking %s for reserved-ness\n",dest->data);
2466 if (reserved_word(dest,ctx)) return ctx->w==RES_SNTX;
2467 }
2468#ifndef __U_BOOT__
2469 glob_target = &child->glob_result;
wdenk8bde7f72003-06-27 21:31:46 +00002470 if (child->argv) flags |= GLOB_APPEND;
wdenkfe8c2802002-11-03 00:38:21 +00002471#else
2472 for (cnt = 1, s = dest->data; s && *s; s++) {
2473 if (*s == '\\') s++;
2474 cnt++;
2475 }
2476 str = malloc(cnt);
2477 if (!str) return 1;
2478 if ( child->argv == NULL) {
2479 child->argc=0;
2480 }
2481 argc = ++child->argc;
2482 child->argv = realloc(child->argv, (argc+1)*sizeof(*child->argv));
2483 if (child->argv == NULL) return 1;
2484 child->argv[argc-1]=str;
2485 child->argv[argc]=NULL;
2486 for (s = dest->data; s && *s; s++,str++) {
2487 if (*s == '\\') s++;
2488 *str = *s;
2489 }
2490 *str = '\0';
2491#endif
2492#ifndef __U_BOOT__
2493 }
2494 gr = xglob(dest, flags, glob_target);
2495 if (gr != 0) return 1;
2496#endif
2497
2498 b_reset(dest);
2499#ifndef __U_BOOT__
2500 if (ctx->pending_redirect) {
2501 ctx->pending_redirect=NULL;
2502 if (glob_target->gl_pathc != 1) {
2503 error_msg("ambiguous redirect");
2504 return 1;
2505 }
2506 } else {
2507 child->argv = glob_target->gl_pathv;
2508 }
2509#endif
2510 if (ctx->w == RES_FOR) {
2511 done_word(dest,ctx);
2512 done_pipe(ctx,PIPE_SEQ);
2513 }
2514 return 0;
2515}
2516
2517/* The only possible error here is out of memory, in which case
2518 * xmalloc exits. */
2519static int done_command(struct p_context *ctx)
2520{
2521 /* The child is really already in the pipe structure, so
2522 * advance the pipe counter and make a new, null child.
2523 * Only real trickiness here is that the uncommitted
2524 * child structure, to which ctx->child points, is not
2525 * counted in pi->num_progs. */
2526 struct pipe *pi=ctx->pipe;
2527 struct child_prog *prog=ctx->child;
2528
2529 if (prog && prog->group == NULL
wdenk8bde7f72003-06-27 21:31:46 +00002530 && prog->argv == NULL
wdenkfe8c2802002-11-03 00:38:21 +00002531#ifndef __U_BOOT__
wdenk8bde7f72003-06-27 21:31:46 +00002532 && prog->redirects == NULL) {
wdenkfe8c2802002-11-03 00:38:21 +00002533#else
2534 ) {
2535#endif
2536 debug_printf("done_command: skipping null command\n");
2537 return 0;
2538 } else if (prog) {
2539 pi->num_progs++;
2540 debug_printf("done_command: num_progs incremented to %d\n",pi->num_progs);
2541 } else {
2542 debug_printf("done_command: initializing\n");
2543 }
2544 pi->progs = xrealloc(pi->progs, sizeof(*pi->progs) * (pi->num_progs+1));
2545
2546 prog = pi->progs + pi->num_progs;
2547#ifndef __U_BOOT__
2548 prog->redirects = NULL;
2549#endif
2550 prog->argv = NULL;
2551#ifndef __U_BOOT__
2552 prog->is_stopped = 0;
2553#endif
2554 prog->group = NULL;
2555#ifndef __U_BOOT__
2556 prog->glob_result.gl_pathv = NULL;
2557 prog->family = pi;
2558#endif
2559 prog->sp = 0;
2560 ctx->child = prog;
2561 prog->type = ctx->type;
2562
2563 /* but ctx->pipe and ctx->list_head remain unchanged */
2564 return 0;
2565}
2566
2567static int done_pipe(struct p_context *ctx, pipe_style type)
2568{
2569 struct pipe *new_p;
2570 done_command(ctx); /* implicit closure of previous command */
2571 debug_printf("done_pipe, type %d\n", type);
2572 ctx->pipe->followup = type;
2573 ctx->pipe->r_mode = ctx->w;
2574 new_p=new_pipe();
2575 ctx->pipe->next = new_p;
2576 ctx->pipe = new_p;
2577 ctx->child = NULL;
2578 done_command(ctx); /* set up new pipe to accept commands */
2579 return 0;
2580}
2581
2582#ifndef __U_BOOT__
2583/* peek ahead in the in_str to find out if we have a "&n" construct,
2584 * as in "2>&1", that represents duplicating a file descriptor.
2585 * returns either -2 (syntax error), -1 (no &), or the number found.
2586 */
2587static int redirect_dup_num(struct in_str *input)
2588{
2589 int ch, d=0, ok=0;
2590 ch = b_peek(input);
2591 if (ch != '&') return -1;
2592
2593 b_getch(input); /* get the & */
2594 ch=b_peek(input);
2595 if (ch == '-') {
2596 b_getch(input);
2597 return -3; /* "-" represents "close me" */
2598 }
2599 while (isdigit(ch)) {
2600 d = d*10+(ch-'0');
2601 ok=1;
2602 b_getch(input);
2603 ch = b_peek(input);
2604 }
2605 if (ok) return d;
2606
2607 error_msg("ambiguous redirect");
2608 return -2;
2609}
2610
2611/* If a redirect is immediately preceded by a number, that number is
2612 * supposed to tell which file descriptor to redirect. This routine
2613 * looks for such preceding numbers. In an ideal world this routine
2614 * needs to handle all the following classes of redirects...
2615 * echo 2>foo # redirects fd 2 to file "foo", nothing passed to echo
2616 * echo 49>foo # redirects fd 49 to file "foo", nothing passed to echo
2617 * echo -2>foo # redirects fd 1 to file "foo", "-2" passed to echo
2618 * echo 49x>foo # redirects fd 1 to file "foo", "49x" passed to echo
2619 * A -1 output from this program means no valid number was found, so the
2620 * caller should use the appropriate default for this redirection.
2621 */
2622static int redirect_opt_num(o_string *o)
2623{
2624 int num;
2625
2626 if (o->length==0) return -1;
2627 for(num=0; num<o->length; num++) {
2628 if (!isdigit(*(o->data+num))) {
2629 return -1;
2630 }
2631 }
2632 /* reuse num (and save an int) */
2633 num=atoi(o->data);
2634 b_reset(o);
2635 return num;
2636}
2637
2638FILE *generate_stream_from_list(struct pipe *head)
2639{
2640 FILE *pf;
2641#if 1
2642 int pid, channel[2];
2643 if (pipe(channel)<0) perror_msg_and_die("pipe");
2644 pid=fork();
2645 if (pid<0) {
2646 perror_msg_and_die("fork");
2647 } else if (pid==0) {
2648 close(channel[0]);
2649 if (channel[1] != 1) {
2650 dup2(channel[1],1);
2651 close(channel[1]);
2652 }
2653#if 0
2654#define SURROGATE "surrogate response"
2655 write(1,SURROGATE,sizeof(SURROGATE));
2656 _exit(run_list(head));
2657#else
2658 _exit(run_list_real(head)); /* leaks memory */
2659#endif
2660 }
2661 debug_printf("forked child %d\n",pid);
2662 close(channel[1]);
2663 pf = fdopen(channel[0],"r");
2664 debug_printf("pipe on FILE *%p\n",pf);
2665#else
2666 free_pipe_list(head,0);
2667 pf=popen("echo surrogate response","r");
2668 debug_printf("started fake pipe on FILE *%p\n",pf);
2669#endif
2670 return pf;
2671}
2672
2673/* this version hacked for testing purposes */
2674/* return code is exit status of the process that is run. */
2675static int process_command_subs(o_string *dest, struct p_context *ctx, struct in_str *input, int subst_end)
2676{
2677 int retcode;
2678 o_string result=NULL_O_STRING;
2679 struct p_context inner;
2680 FILE *p;
2681 struct in_str pipe_str;
2682 initialize_context(&inner);
2683
2684 /* recursion to generate command */
2685 retcode = parse_stream(&result, &inner, input, subst_end);
2686 if (retcode != 0) return retcode; /* syntax error or EOF */
2687 done_word(&result, &inner);
2688 done_pipe(&inner, PIPE_SEQ);
2689 b_free(&result);
2690
2691 p=generate_stream_from_list(inner.list_head);
2692 if (p==NULL) return 1;
2693 mark_open(fileno(p));
2694 setup_file_in_str(&pipe_str, p);
2695
2696 /* now send results of command back into original context */
2697 retcode = parse_stream(dest, ctx, &pipe_str, '\0');
2698 /* XXX In case of a syntax error, should we try to kill the child?
2699 * That would be tough to do right, so just read until EOF. */
2700 if (retcode == 1) {
2701 while (b_getch(&pipe_str)!=EOF) { /* discard */ };
2702 }
2703
2704 debug_printf("done reading from pipe, pclose()ing\n");
2705 /* This is the step that wait()s for the child. Should be pretty
2706 * safe, since we just read an EOF from its stdout. We could try
2707 * to better, by using wait(), and keeping track of background jobs
2708 * at the same time. That would be a lot of work, and contrary
2709 * to the KISS philosophy of this program. */
2710 mark_closed(fileno(p));
2711 retcode=pclose(p);
2712 free_pipe_list(inner.list_head,0);
2713 debug_printf("pclosed, retcode=%d\n",retcode);
2714 /* XXX this process fails to trim a single trailing newline */
2715 return retcode;
2716}
2717
2718static int parse_group(o_string *dest, struct p_context *ctx,
2719 struct in_str *input, int ch)
2720{
2721 int rcode, endch=0;
2722 struct p_context sub;
2723 struct child_prog *child = ctx->child;
2724 if (child->argv) {
2725 syntax();
2726 return 1; /* syntax error, groups and arglists don't mix */
2727 }
2728 initialize_context(&sub);
2729 switch(ch) {
2730 case '(': endch=')'; child->subshell=1; break;
2731 case '{': endch='}'; break;
2732 default: syntax(); /* really logic error */
2733 }
2734 rcode=parse_stream(dest,&sub,input,endch);
2735 done_word(dest,&sub); /* finish off the final word in the subcontext */
2736 done_pipe(&sub, PIPE_SEQ); /* and the final command there, too */
2737 child->group = sub.list_head;
2738 return rcode;
2739 /* child remains "open", available for possible redirects */
2740}
2741#endif
2742
2743/* basically useful version until someone wants to get fancier,
2744 * see the bash man page under "Parameter Expansion" */
2745static char *lookup_param(char *src)
2746{
wdenkc26e4542004-04-18 10:13:26 +00002747 char *p;
Joe Hershberger641b0d32012-08-17 10:26:29 +00002748 char *sep;
2749 char *default_val = NULL;
2750 int assign = 0;
2751 int expand_empty = 0;
wdenkc26e4542004-04-18 10:13:26 +00002752
2753 if (!src)
2754 return NULL;
2755
Joe Hershberger641b0d32012-08-17 10:26:29 +00002756 sep = strchr(src, ':');
2757
2758 if (sep) {
2759 *sep = '\0';
2760 if (*(sep + 1) == '-')
2761 default_val = sep+2;
2762 if (*(sep + 1) == '=') {
2763 default_val = sep+2;
2764 assign = 1;
2765 }
2766 if (*(sep + 1) == '+') {
2767 default_val = sep+2;
2768 expand_empty = 1;
2769 }
2770 }
2771
2772 p = getenv(src);
2773 if (!p)
2774 p = get_local_var(src);
2775
2776 if (!p || strlen(p) == 0) {
2777 p = default_val;
2778 if (assign) {
2779 char *var = malloc(strlen(src)+strlen(default_val)+2);
2780 if (var) {
2781 sprintf(var, "%s=%s", src, default_val);
2782 set_local_var(var, 0);
2783 }
2784 free(var);
2785 }
2786 } else if (expand_empty) {
2787 p += strlen(p);
2788 }
2789
2790 if (sep)
2791 *sep = ':';
wdenkc26e4542004-04-18 10:13:26 +00002792
wdenkfe8c2802002-11-03 00:38:21 +00002793 return p;
2794}
2795
wdenkc26e4542004-04-18 10:13:26 +00002796#ifdef __U_BOOT__
2797static char *get_dollar_var(char ch)
2798{
2799 static char buf[40];
2800
2801 buf[0] = '\0';
2802 switch (ch) {
2803 case '?':
2804 sprintf(buf, "%u", (unsigned int)last_return_code);
2805 break;
2806 default:
2807 return NULL;
2808 }
2809 return buf;
2810}
2811#endif
2812
wdenkfe8c2802002-11-03 00:38:21 +00002813/* return code: 0 for OK, 1 for syntax error */
2814static int handle_dollar(o_string *dest, struct p_context *ctx, struct in_str *input)
2815{
2816#ifndef __U_BOOT__
2817 int i, advance=0;
2818#else
2819 int advance=0;
2820#endif
2821#ifndef __U_BOOT__
2822 char sep[]=" ";
2823#endif
2824 int ch = input->peek(input); /* first character after the $ */
2825 debug_printf("handle_dollar: ch=%c\n",ch);
2826 if (isalpha(ch)) {
2827 b_addchr(dest, SPECIAL_VAR_SYMBOL);
2828 ctx->child->sp++;
2829 while(ch=b_peek(input),isalnum(ch) || ch=='_') {
2830 b_getch(input);
2831 b_addchr(dest,ch);
2832 }
2833 b_addchr(dest, SPECIAL_VAR_SYMBOL);
2834#ifndef __U_BOOT__
2835 } else if (isdigit(ch)) {
2836 i = ch-'0'; /* XXX is $0 special? */
2837 if (i<global_argc) {
2838 parse_string(dest, ctx, global_argv[i]); /* recursion */
2839 }
2840 advance = 1;
2841#endif
2842 } else switch (ch) {
2843#ifndef __U_BOOT__
2844 case '$':
2845 b_adduint(dest,getpid());
2846 advance = 1;
2847 break;
2848 case '!':
2849 if (last_bg_pid > 0) b_adduint(dest, last_bg_pid);
2850 advance = 1;
2851 break;
2852#endif
2853 case '?':
wdenkc26e4542004-04-18 10:13:26 +00002854#ifndef __U_BOOT__
wdenkfe8c2802002-11-03 00:38:21 +00002855 b_adduint(dest,last_return_code);
wdenkc26e4542004-04-18 10:13:26 +00002856#else
2857 ctx->child->sp++;
2858 b_addchr(dest, SPECIAL_VAR_SYMBOL);
2859 b_addchr(dest, '$');
2860 b_addchr(dest, '?');
2861 b_addchr(dest, SPECIAL_VAR_SYMBOL);
2862#endif
wdenkfe8c2802002-11-03 00:38:21 +00002863 advance = 1;
2864 break;
2865#ifndef __U_BOOT__
2866 case '#':
2867 b_adduint(dest,global_argc ? global_argc-1 : 0);
2868 advance = 1;
2869 break;
2870#endif
2871 case '{':
2872 b_addchr(dest, SPECIAL_VAR_SYMBOL);
2873 ctx->child->sp++;
2874 b_getch(input);
2875 /* XXX maybe someone will try to escape the '}' */
2876 while(ch=b_getch(input),ch!=EOF && ch!='}') {
2877 b_addchr(dest,ch);
2878 }
2879 if (ch != '}') {
2880 syntax();
2881 return 1;
2882 }
2883 b_addchr(dest, SPECIAL_VAR_SYMBOL);
2884 break;
2885#ifndef __U_BOOT__
2886 case '(':
2887 b_getch(input);
2888 process_command_subs(dest, ctx, input, ')');
2889 break;
2890 case '*':
2891 sep[0]=ifs[0];
2892 for (i=1; i<global_argc; i++) {
2893 parse_string(dest, ctx, global_argv[i]);
2894 if (i+1 < global_argc) parse_string(dest, ctx, sep);
2895 }
2896 break;
2897 case '@':
2898 case '-':
2899 case '_':
2900 /* still unhandled, but should be eventually */
2901 error_msg("unhandled syntax: $%c",ch);
2902 return 1;
2903 break;
2904#endif
2905 default:
2906 b_addqchr(dest,'$',dest->quote);
2907 }
2908 /* Eat the character if the flag was set. If the compiler
2909 * is smart enough, we could substitute "b_getch(input);"
2910 * for all the "advance = 1;" above, and also end up with
2911 * a nice size-optimized program. Hah! That'll be the day.
2912 */
2913 if (advance) b_getch(input);
2914 return 0;
2915}
2916
2917#ifndef __U_BOOT__
2918int parse_string(o_string *dest, struct p_context *ctx, const char *src)
2919{
2920 struct in_str foo;
2921 setup_string_in_str(&foo, src);
2922 return parse_stream(dest, ctx, &foo, '\0');
2923}
2924#endif
2925
2926/* return code is 0 for normal exit, 1 for syntax error */
2927int parse_stream(o_string *dest, struct p_context *ctx,
2928 struct in_str *input, int end_trigger)
2929{
2930 unsigned int ch, m;
2931#ifndef __U_BOOT__
2932 int redir_fd;
2933 redir_type redir_style;
2934#endif
2935 int next;
2936
2937 /* Only double-quote state is handled in the state variable dest->quote.
2938 * A single-quote triggers a bypass of the main loop until its mate is
2939 * found. When recursing, quote state is passed in via dest->quote. */
2940
2941 debug_printf("parse_stream, end_trigger=%d\n",end_trigger);
2942 while ((ch=b_getch(input))!=EOF) {
2943 m = map[ch];
2944#ifdef __U_BOOT__
2945 if (input->__promptme == 0) return 1;
2946#endif
2947 next = (ch == '\n') ? 0 : b_peek(input);
wdenkc26e4542004-04-18 10:13:26 +00002948
2949 debug_printf("parse_stream: ch=%c (%d) m=%d quote=%d - %c\n",
2950 ch >= ' ' ? ch : '.', ch, m,
2951 dest->quote, ctx->stack == NULL ? '*' : '.');
2952
wdenkfe8c2802002-11-03 00:38:21 +00002953 if (m==0 || ((m==1 || m==2) && dest->quote)) {
2954 b_addqchr(dest, ch, dest->quote);
2955 } else {
2956 if (m==2) { /* unquoted IFS */
2957 if (done_word(dest, ctx)) {
2958 return 1;
2959 }
2960 /* If we aren't performing a substitution, treat a newline as a
2961 * command separator. */
2962 if (end_trigger != '\0' && ch=='\n')
2963 done_pipe(ctx,PIPE_SEQ);
2964 }
2965 if (ch == end_trigger && !dest->quote && ctx->w==RES_NONE) {
2966 debug_printf("leaving parse_stream (triggered)\n");
2967 return 0;
2968 }
2969#if 0
2970 if (ch=='\n') {
2971 /* Yahoo! Time to run with it! */
2972 done_pipe(ctx,PIPE_SEQ);
2973 run_list(ctx->list_head);
2974 initialize_context(ctx);
2975 }
2976#endif
2977 if (m!=2) switch (ch) {
2978 case '#':
2979 if (dest->length == 0 && !dest->quote) {
2980 while(ch=b_peek(input),ch!=EOF && ch!='\n') { b_getch(input); }
2981 } else {
2982 b_addqchr(dest, ch, dest->quote);
2983 }
2984 break;
2985 case '\\':
2986 if (next == EOF) {
2987 syntax();
2988 return 1;
2989 }
2990 b_addqchr(dest, '\\', dest->quote);
2991 b_addqchr(dest, b_getch(input), dest->quote);
2992 break;
2993 case '$':
2994 if (handle_dollar(dest, ctx, input)!=0) return 1;
2995 break;
2996 case '\'':
2997 dest->nonnull = 1;
2998 while(ch=b_getch(input),ch!=EOF && ch!='\'') {
2999#ifdef __U_BOOT__
3000 if(input->__promptme == 0) return 1;
3001#endif
3002 b_addchr(dest,ch);
3003 }
3004 if (ch==EOF) {
3005 syntax();
3006 return 1;
3007 }
3008 break;
3009 case '"':
3010 dest->nonnull = 1;
3011 dest->quote = !dest->quote;
3012 break;
3013#ifndef __U_BOOT__
3014 case '`':
3015 process_command_subs(dest, ctx, input, '`');
3016 break;
3017 case '>':
3018 redir_fd = redirect_opt_num(dest);
3019 done_word(dest, ctx);
3020 redir_style=REDIRECT_OVERWRITE;
3021 if (next == '>') {
3022 redir_style=REDIRECT_APPEND;
3023 b_getch(input);
3024 } else if (next == '(') {
3025 syntax(); /* until we support >(list) Process Substitution */
3026 return 1;
3027 }
3028 setup_redirect(ctx, redir_fd, redir_style, input);
3029 break;
3030 case '<':
3031 redir_fd = redirect_opt_num(dest);
3032 done_word(dest, ctx);
3033 redir_style=REDIRECT_INPUT;
3034 if (next == '<') {
3035 redir_style=REDIRECT_HEREIS;
3036 b_getch(input);
3037 } else if (next == '>') {
3038 redir_style=REDIRECT_IO;
3039 b_getch(input);
3040 } else if (next == '(') {
3041 syntax(); /* until we support <(list) Process Substitution */
3042 return 1;
3043 }
3044 setup_redirect(ctx, redir_fd, redir_style, input);
3045 break;
3046#endif
3047 case ';':
3048 done_word(dest, ctx);
3049 done_pipe(ctx,PIPE_SEQ);
3050 break;
3051 case '&':
3052 done_word(dest, ctx);
3053 if (next=='&') {
3054 b_getch(input);
3055 done_pipe(ctx,PIPE_AND);
3056 } else {
3057#ifndef __U_BOOT__
3058 done_pipe(ctx,PIPE_BG);
3059#else
3060 syntax_err();
3061 return 1;
3062#endif
3063 }
3064 break;
3065 case '|':
3066 done_word(dest, ctx);
3067 if (next=='|') {
3068 b_getch(input);
3069 done_pipe(ctx,PIPE_OR);
3070 } else {
3071 /* we could pick up a file descriptor choice here
3072 * with redirect_opt_num(), but bash doesn't do it.
3073 * "echo foo 2| cat" yields "foo 2". */
3074#ifndef __U_BOOT__
3075 done_command(ctx);
3076#else
3077 syntax_err();
3078 return 1;
3079#endif
3080 }
3081 break;
3082#ifndef __U_BOOT__
3083 case '(':
3084 case '{':
3085 if (parse_group(dest, ctx, input, ch)!=0) return 1;
3086 break;
3087 case ')':
3088 case '}':
3089 syntax(); /* Proper use of this character caught by end_trigger */
3090 return 1;
3091 break;
3092#endif
Joe Hershbergera005f192012-08-17 10:26:30 +00003093 case SUBSTED_VAR_SYMBOL:
3094 dest->nonnull = 1;
3095 while (ch = b_getch(input), ch != EOF &&
3096 ch != SUBSTED_VAR_SYMBOL) {
3097 debug_printf("subst, pass=%d\n", ch);
3098 if (input->__promptme == 0)
3099 return 1;
3100 b_addchr(dest, ch);
3101 }
3102 debug_printf("subst, term=%d\n", ch);
3103 if (ch == EOF) {
3104 syntax();
3105 return 1;
3106 }
3107 break;
wdenkfe8c2802002-11-03 00:38:21 +00003108 default:
3109 syntax(); /* this is really an internal logic error */
3110 return 1;
3111 }
3112 }
3113 }
3114 /* complain if quote? No, maybe we just finished a command substitution
3115 * that was quoted. Example:
3116 * $ echo "`cat foo` plus more"
3117 * and we just got the EOF generated by the subshell that ran "cat foo"
3118 * The only real complaint is if we got an EOF when end_trigger != '\0',
3119 * that is, we were really supposed to get end_trigger, and never got
3120 * one before the EOF. Can't use the standard "syntax error" return code,
3121 * so that parse_stream_outer can distinguish the EOF and exit smoothly. */
3122 debug_printf("leaving parse_stream (EOF)\n");
3123 if (end_trigger != '\0') return -1;
3124 return 0;
3125}
3126
3127void mapset(const unsigned char *set, int code)
3128{
3129 const unsigned char *s;
3130 for (s=set; *s; s++) map[*s] = code;
3131}
3132
3133void update_ifs_map(void)
3134{
3135 /* char *ifs and char map[256] are both globals. */
Wolfgang Denk77ddac92005-10-13 16:45:02 +02003136 ifs = (uchar *)getenv("IFS");
3137 if (ifs == NULL) ifs=(uchar *)" \t\n";
wdenkfe8c2802002-11-03 00:38:21 +00003138 /* Precompute a list of 'flow through' behavior so it can be treated
3139 * quickly up front. Computation is necessary because of IFS.
3140 * Special case handling of IFS == " \t\n" is not implemented.
3141 * The map[] array only really needs two bits each, and on most machines
3142 * that would be faster because of the reduced L1 cache footprint.
3143 */
3144 memset(map,0,sizeof(map)); /* most characters flow through always */
3145#ifndef __U_BOOT__
Wolfgang Denk77ddac92005-10-13 16:45:02 +02003146 mapset((uchar *)"\\$'\"`", 3); /* never flow through */
3147 mapset((uchar *)"<>;&|(){}#", 1); /* flow through if quoted */
wdenkfe8c2802002-11-03 00:38:21 +00003148#else
Joe Hershbergera005f192012-08-17 10:26:30 +00003149 {
3150 uchar subst[2] = {SUBSTED_VAR_SYMBOL, 0};
3151 mapset(subst, 3); /* never flow through */
3152 }
Wolfgang Denk77ddac92005-10-13 16:45:02 +02003153 mapset((uchar *)"\\$'\"", 3); /* never flow through */
3154 mapset((uchar *)";&|#", 1); /* flow through if quoted */
wdenkfe8c2802002-11-03 00:38:21 +00003155#endif
3156 mapset(ifs, 2); /* also flow through if quoted */
3157}
3158
3159/* most recursion does not come through here, the exeception is
3160 * from builtin_source() */
3161int parse_stream_outer(struct in_str *inp, int flag)
3162{
3163
3164 struct p_context ctx;
3165 o_string temp=NULL_O_STRING;
3166 int rcode;
3167#ifdef __U_BOOT__
3168 int code = 0;
3169#endif
3170 do {
3171 ctx.type = flag;
3172 initialize_context(&ctx);
3173 update_ifs_map();
Wolfgang Denk77ddac92005-10-13 16:45:02 +02003174 if (!(flag & FLAG_PARSE_SEMICOLON) || (flag & FLAG_REPARSING)) mapset((uchar *)";$&|", 0);
wdenkfe8c2802002-11-03 00:38:21 +00003175 inp->promptmode=1;
3176 rcode = parse_stream(&temp, &ctx, inp, '\n');
3177#ifdef __U_BOOT__
3178 if (rcode == 1) flag_repeat = 0;
3179#endif
3180 if (rcode != 1 && ctx.old_flag != 0) {
3181 syntax();
3182#ifdef __U_BOOT__
3183 flag_repeat = 0;
3184#endif
3185 }
3186 if (rcode != 1 && ctx.old_flag == 0) {
3187 done_word(&temp, &ctx);
3188 done_pipe(&ctx,PIPE_SEQ);
3189#ifndef __U_BOOT__
3190 run_list(ctx.list_head);
3191#else
wdenkc26e4542004-04-18 10:13:26 +00003192 code = run_list(ctx.list_head);
3193 if (code == -2) { /* exit */
3194 b_free(&temp);
3195 code = 0;
3196 /* XXX hackish way to not allow exit from main loop */
3197 if (inp->peek == file_peek) {
3198 printf("exit not allowed from main input shell.\n");
3199 continue;
3200 }
3201 break;
3202 }
3203 if (code == -1)
wdenkfe8c2802002-11-03 00:38:21 +00003204 flag_repeat = 0;
3205#endif
3206 } else {
3207 if (ctx.old_flag != 0) {
3208 free(ctx.stack);
3209 b_reset(&temp);
3210 }
3211#ifdef __U_BOOT__
3212 if (inp->__promptme == 0) printf("<INTERRUPT>\n");
3213 inp->__promptme = 1;
3214#endif
3215 temp.nonnull = 0;
3216 temp.quote = 0;
3217 inp->p = NULL;
3218 free_pipe_list(ctx.list_head,0);
3219 }
3220 b_free(&temp);
3221 } while (rcode != -1 && !(flag & FLAG_EXIT_FROM_LOOP)); /* loop on syntax errors, return on EOF */
3222#ifndef __U_BOOT__
3223 return 0;
3224#else
3225 return (code != 0) ? 1 : 0;
3226#endif /* __U_BOOT__ */
3227}
3228
3229#ifndef __U_BOOT__
3230static int parse_string_outer(const char *s, int flag)
3231#else
Jason Hobbsc8a20792011-08-31 05:37:24 +00003232int parse_string_outer(const char *s, int flag)
wdenkfe8c2802002-11-03 00:38:21 +00003233#endif /* __U_BOOT__ */
3234{
3235 struct in_str input;
3236#ifdef __U_BOOT__
3237 char *p = NULL;
3238 int rcode;
3239 if ( !s || !*s)
3240 return 1;
3241 if (!(p = strchr(s, '\n')) || *++p) {
3242 p = xmalloc(strlen(s) + 2);
3243 strcpy(p, s);
3244 strcat(p, "\n");
3245 setup_string_in_str(&input, p);
3246 rcode = parse_stream_outer(&input, flag);
3247 free(p);
3248 return rcode;
3249 } else {
3250#endif
3251 setup_string_in_str(&input, s);
3252 return parse_stream_outer(&input, flag);
3253#ifdef __U_BOOT__
3254 }
3255#endif
3256}
3257
3258#ifndef __U_BOOT__
3259static int parse_file_outer(FILE *f)
3260#else
3261int parse_file_outer(void)
3262#endif
3263{
3264 int rcode;
3265 struct in_str input;
3266#ifndef __U_BOOT__
3267 setup_file_in_str(&input, f);
3268#else
3269 setup_file_in_str(&input);
3270#endif
3271 rcode = parse_stream_outer(&input, FLAG_PARSE_SEMICOLON);
3272 return rcode;
3273}
3274
3275#ifdef __U_BOOT__
Wolfgang Denk2e5167c2010-10-28 20:00:11 +02003276#ifdef CONFIG_NEEDS_MANUAL_RELOC
wdenk3e386912003-04-05 00:53:31 +00003277static void u_boot_hush_reloc(void)
3278{
wdenk3e386912003-04-05 00:53:31 +00003279 unsigned long addr;
3280 struct reserved_combo *r;
3281
3282 for (r=reserved_list; r<reserved_list+NRES; r++) {
3283 addr = (ulong) (r->literal) + gd->reloc_off;
3284 r->literal = (char *)addr;
3285 }
3286}
Peter Tyser521af042009-09-21 11:20:36 -05003287#endif
wdenk3e386912003-04-05 00:53:31 +00003288
wdenkfe8c2802002-11-03 00:38:21 +00003289int u_boot_hush_start(void)
3290{
wdenk2d5b5612003-10-14 19:43:55 +00003291 if (top_vars == NULL) {
3292 top_vars = malloc(sizeof(struct variables));
3293 top_vars->name = "HUSH_VERSION";
3294 top_vars->value = "0.01";
3295 top_vars->next = 0;
3296 top_vars->flg_export = 0;
3297 top_vars->flg_read_only = 1;
Wolfgang Denk2e5167c2010-10-28 20:00:11 +02003298#ifdef CONFIG_NEEDS_MANUAL_RELOC
wdenk2d5b5612003-10-14 19:43:55 +00003299 u_boot_hush_reloc();
Peter Tyser521af042009-09-21 11:20:36 -05003300#endif
wdenk2d5b5612003-10-14 19:43:55 +00003301 }
wdenkfe8c2802002-11-03 00:38:21 +00003302 return 0;
3303}
3304
3305static void *xmalloc(size_t size)
3306{
3307 void *p = NULL;
3308
3309 if (!(p = malloc(size))) {
3310 printf("ERROR : memory not allocated\n");
3311 for(;;);
3312 }
3313 return p;
3314}
3315
3316static void *xrealloc(void *ptr, size_t size)
3317{
3318 void *p = NULL;
3319
3320 if (!(p = realloc(ptr, size))) {
3321 printf("ERROR : memory not allocated\n");
3322 for(;;);
3323 }
3324 return p;
3325}
3326#endif /* __U_BOOT__ */
3327
3328#ifndef __U_BOOT__
3329/* Make sure we have a controlling tty. If we get started under a job
3330 * aware app (like bash for example), make sure we are now in charge so
3331 * we don't fight over who gets the foreground */
wdenkd0fb80c2003-01-11 09:48:40 +00003332static void setup_job_control(void)
wdenkfe8c2802002-11-03 00:38:21 +00003333{
3334 static pid_t shell_pgrp;
3335 /* Loop until we are in the foreground. */
3336 while (tcgetpgrp (shell_terminal) != (shell_pgrp = getpgrp ()))
3337 kill (- shell_pgrp, SIGTTIN);
3338
3339 /* Ignore interactive and job-control signals. */
3340 signal(SIGINT, SIG_IGN);
3341 signal(SIGQUIT, SIG_IGN);
3342 signal(SIGTERM, SIG_IGN);
3343 signal(SIGTSTP, SIG_IGN);
3344 signal(SIGTTIN, SIG_IGN);
3345 signal(SIGTTOU, SIG_IGN);
3346 signal(SIGCHLD, SIG_IGN);
3347
3348 /* Put ourselves in our own process group. */
3349 setsid();
3350 shell_pgrp = getpid ();
3351 setpgid (shell_pgrp, shell_pgrp);
3352
3353 /* Grab control of the terminal. */
3354 tcsetpgrp(shell_terminal, shell_pgrp);
3355}
3356
Wolfgang Denk54841ab2010-06-28 22:00:46 +02003357int hush_main(int argc, char * const *argv)
wdenkfe8c2802002-11-03 00:38:21 +00003358{
3359 int opt;
3360 FILE *input;
3361 char **e = environ;
3362
3363 /* XXX what should these be while sourcing /etc/profile? */
3364 global_argc = argc;
3365 global_argv = argv;
3366
3367 /* (re?) initialize globals. Sometimes hush_main() ends up calling
3368 * hush_main(), therefore we cannot rely on the BSS to zero out this
3369 * stuff. Reset these to 0 every time. */
3370 ifs = NULL;
3371 /* map[] is taken care of with call to update_ifs_map() */
3372 fake_mode = 0;
3373 interactive = 0;
3374 close_me_head = NULL;
3375 last_bg_pid = 0;
3376 job_list = NULL;
3377 last_jobid = 0;
3378
3379 /* Initialize some more globals to non-zero values */
3380 set_cwd();
wdenkd0fb80c2003-01-11 09:48:40 +00003381#ifdef CONFIG_FEATURE_COMMAND_EDITING
wdenkfe8c2802002-11-03 00:38:21 +00003382 cmdedit_set_initial_prompt();
3383#else
3384 PS1 = NULL;
3385#endif
3386 PS2 = "> ";
3387
3388 /* initialize our shell local variables with the values
3389 * currently living in the environment */
3390 if (e) {
3391 for (; *e; e++)
3392 set_local_var(*e, 2); /* without call putenv() */
3393 }
3394
3395 last_return_code=EXIT_SUCCESS;
3396
3397
3398 if (argv[0] && argv[0][0] == '-') {
3399 debug_printf("\nsourcing /etc/profile\n");
3400 if ((input = fopen("/etc/profile", "r")) != NULL) {
3401 mark_open(fileno(input));
3402 parse_file_outer(input);
3403 mark_closed(fileno(input));
3404 fclose(input);
3405 }
3406 }
3407 input=stdin;
3408
3409 while ((opt = getopt(argc, argv, "c:xif")) > 0) {
3410 switch (opt) {
3411 case 'c':
3412 {
3413 global_argv = argv+optind;
3414 global_argc = argc-optind;
3415 opt = parse_string_outer(optarg, FLAG_PARSE_SEMICOLON);
3416 goto final_return;
3417 }
3418 break;
3419 case 'i':
3420 interactive++;
3421 break;
3422 case 'f':
3423 fake_mode++;
3424 break;
3425 default:
3426#ifndef BB_VER
3427 fprintf(stderr, "Usage: sh [FILE]...\n"
3428 " or: sh -c command [args]...\n\n");
3429 exit(EXIT_FAILURE);
3430#else
3431 show_usage();
3432#endif
3433 }
3434 }
3435 /* A shell is interactive if the `-i' flag was given, or if all of
3436 * the following conditions are met:
3437 * no -c command
3438 * no arguments remaining or the -s flag given
3439 * standard input is a terminal
3440 * standard output is a terminal
3441 * Refer to Posix.2, the description of the `sh' utility. */
3442 if (argv[optind]==NULL && input==stdin &&
3443 isatty(fileno(stdin)) && isatty(fileno(stdout))) {
3444 interactive++;
3445 }
3446
3447 debug_printf("\ninteractive=%d\n", interactive);
3448 if (interactive) {
3449 /* Looks like they want an interactive shell */
wdenk8bde7f72003-06-27 21:31:46 +00003450#ifndef CONFIG_FEATURE_SH_EXTRA_QUIET
wdenkd0fb80c2003-01-11 09:48:40 +00003451 printf( "\n\n" BB_BANNER " hush - the humble shell v0.01 (testing)\n");
3452 printf( "Enter 'help' for a list of built-in commands.\n\n");
3453#endif
wdenkfe8c2802002-11-03 00:38:21 +00003454 setup_job_control();
3455 }
3456
3457 if (argv[optind]==NULL) {
3458 opt=parse_file_outer(stdin);
3459 goto final_return;
3460 }
3461
3462 debug_printf("\nrunning script '%s'\n", argv[optind]);
3463 global_argv = argv+optind;
3464 global_argc = argc-optind;
3465 input = xfopen(argv[optind], "r");
3466 opt = parse_file_outer(input);
3467
wdenkd0fb80c2003-01-11 09:48:40 +00003468#ifdef CONFIG_FEATURE_CLEAN_UP
wdenkfe8c2802002-11-03 00:38:21 +00003469 fclose(input);
3470 if (cwd && cwd != unknown)
3471 free((char*)cwd);
3472 {
3473 struct variables *cur, *tmp;
3474 for(cur = top_vars; cur; cur = tmp) {
3475 tmp = cur->next;
3476 if (!cur->flg_read_only) {
3477 free(cur->name);
3478 free(cur->value);
3479 free(cur);
3480 }
3481 }
3482 }
3483#endif
3484
3485final_return:
3486 return(opt?opt:last_return_code);
3487}
3488#endif
3489
3490static char *insert_var_value(char *inp)
3491{
Joe Hershbergera005f192012-08-17 10:26:30 +00003492 return insert_var_value_sub(inp, 0);
3493}
3494
3495static char *insert_var_value_sub(char *inp, int tag_subst)
3496{
wdenkfe8c2802002-11-03 00:38:21 +00003497 int res_str_len = 0;
3498 int len;
3499 int done = 0;
3500 char *p, *p1, *res_str = NULL;
3501
3502 while ((p = strchr(inp, SPECIAL_VAR_SYMBOL))) {
Joe Hershbergera005f192012-08-17 10:26:30 +00003503 /* check the beginning of the string for normal charachters */
wdenkfe8c2802002-11-03 00:38:21 +00003504 if (p != inp) {
Joe Hershbergera005f192012-08-17 10:26:30 +00003505 /* copy any charachters to the result string */
wdenkfe8c2802002-11-03 00:38:21 +00003506 len = p - inp;
3507 res_str = xrealloc(res_str, (res_str_len + len));
3508 strncpy((res_str + res_str_len), inp, len);
3509 res_str_len += len;
3510 }
3511 inp = ++p;
Joe Hershbergera005f192012-08-17 10:26:30 +00003512 /* find the ending marker */
wdenkfe8c2802002-11-03 00:38:21 +00003513 p = strchr(inp, SPECIAL_VAR_SYMBOL);
3514 *p = '\0';
Joe Hershbergera005f192012-08-17 10:26:30 +00003515 /* look up the value to substitute */
wdenkfe8c2802002-11-03 00:38:21 +00003516 if ((p1 = lookup_param(inp))) {
Joe Hershbergera005f192012-08-17 10:26:30 +00003517 if (tag_subst)
3518 len = res_str_len + strlen(p1) + 2;
3519 else
3520 len = res_str_len + strlen(p1);
wdenkfe8c2802002-11-03 00:38:21 +00003521 res_str = xrealloc(res_str, (1 + len));
Joe Hershbergera005f192012-08-17 10:26:30 +00003522 if (tag_subst) {
3523 /*
3524 * copy the variable value to the result
3525 * string
3526 */
3527 strcpy((res_str + res_str_len + 1), p1);
3528
3529 /*
3530 * mark the replaced text to be accepted as
3531 * is
3532 */
3533 res_str[res_str_len] = SUBSTED_VAR_SYMBOL;
3534 res_str[res_str_len + 1 + strlen(p1)] =
3535 SUBSTED_VAR_SYMBOL;
3536 } else
3537 /*
3538 * copy the variable value to the result
3539 * string
3540 */
3541 strcpy((res_str + res_str_len), p1);
3542
wdenkfe8c2802002-11-03 00:38:21 +00003543 res_str_len = len;
3544 }
3545 *p = SPECIAL_VAR_SYMBOL;
3546 inp = ++p;
3547 done = 1;
3548 }
3549 if (done) {
3550 res_str = xrealloc(res_str, (1 + res_str_len + strlen(inp)));
3551 strcpy((res_str + res_str_len), inp);
3552 while ((p = strchr(res_str, '\n'))) {
3553 *p = ' ';
3554 }
3555 }
3556 return (res_str == NULL) ? inp : res_str;
3557}
3558
3559static char **make_list_in(char **inp, char *name)
3560{
3561 int len, i;
3562 int name_len = strlen(name);
3563 int n = 0;
3564 char **list;
3565 char *p1, *p2, *p3;
3566
3567 /* create list of variable values */
3568 list = xmalloc(sizeof(*list));
3569 for (i = 0; inp[i]; i++) {
3570 p3 = insert_var_value(inp[i]);
3571 p1 = p3;
3572 while (*p1) {
3573 if ((*p1 == ' ')) {
3574 p1++;
3575 continue;
3576 }
3577 if ((p2 = strchr(p1, ' '))) {
3578 len = p2 - p1;
3579 } else {
3580 len = strlen(p1);
3581 p2 = p1 + len;
3582 }
3583 /* we use n + 2 in realloc for list,because we add
3584 * new element and then we will add NULL element */
3585 list = xrealloc(list, sizeof(*list) * (n + 2));
3586 list[n] = xmalloc(2 + name_len + len);
3587 strcpy(list[n], name);
3588 strcat(list[n], "=");
3589 strncat(list[n], p1, len);
3590 list[n++][name_len + len + 1] = '\0';
3591 p1 = p2;
3592 }
3593 if (p3 != inp[i]) free(p3);
3594 }
3595 list[n] = NULL;
3596 return list;
3597}
3598
3599/* Make new string for parser */
3600static char * make_string(char ** inp)
3601{
3602 char *p;
3603 char *str = NULL;
3604 int n;
3605 int len = 2;
Joe Hershbergera005f192012-08-17 10:26:30 +00003606 char *noeval_str;
3607 int noeval = 0;
wdenkfe8c2802002-11-03 00:38:21 +00003608
Joe Hershbergera005f192012-08-17 10:26:30 +00003609 noeval_str = get_local_var("HUSH_NO_EVAL");
3610 if (noeval_str != NULL && *noeval_str != '0' && *noeval_str != '\0')
3611 noeval = 1;
wdenkfe8c2802002-11-03 00:38:21 +00003612 for (n = 0; inp[n]; n++) {
Joe Hershbergera005f192012-08-17 10:26:30 +00003613 p = insert_var_value_sub(inp[n], noeval);
wdenkfe8c2802002-11-03 00:38:21 +00003614 str = xrealloc(str, (len + strlen(p)));
3615 if (n) {
3616 strcat(str, " ");
3617 } else {
3618 *str = '\0';
3619 }
3620 strcat(str, p);
3621 len = strlen(str) + 3;
3622 if (p != inp[n]) free(p);
3623 }
3624 len = strlen(str);
3625 *(str + len) = '\n';
3626 *(str + len + 1) = '\0';
3627 return str;
3628}
3629
Heiko Schocher81473f62008-10-15 09:40:28 +02003630#ifdef __U_BOOT__
Wolfgang Denk54841ab2010-06-28 22:00:46 +02003631int do_showvar (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
Heiko Schocher81473f62008-10-15 09:40:28 +02003632{
3633 int i, k;
3634 int rcode = 0;
3635 struct variables *cur;
3636
3637 if (argc == 1) { /* Print all env variables */
3638 for (cur = top_vars; cur; cur = cur->next) {
3639 printf ("%s=%s\n", cur->name, cur->value);
3640 if (ctrlc ()) {
3641 puts ("\n ** Abort\n");
3642 return 1;
3643 }
3644 }
3645 return 0;
3646 }
3647 for (i = 1; i < argc; ++i) { /* print single env variables */
3648 char *name = argv[i];
3649
3650 k = -1;
3651 for (cur = top_vars; cur; cur = cur->next) {
3652 if(strcmp (cur->name, name) == 0) {
3653 k = 0;
3654 printf ("%s=%s\n", cur->name, cur->value);
3655 }
3656 if (ctrlc ()) {
3657 puts ("\n ** Abort\n");
3658 return 1;
3659 }
3660 }
3661 if (k < 0) {
3662 printf ("## Error: \"%s\" not defined\n", name);
3663 rcode ++;
3664 }
3665 }
3666 return rcode;
3667}
3668
3669U_BOOT_CMD(
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02003670 showvar, CONFIG_SYS_MAXARGS, 1, do_showvar,
Peter Tyser2fb26042009-01-27 18:03:12 -06003671 "print local hushshell variables",
Heiko Schocher81473f62008-10-15 09:40:28 +02003672 "\n - print values of all hushshell variables\n"
3673 "showvar name ...\n"
Wolfgang Denka89c33d2009-05-24 17:06:54 +02003674 " - print value of hushshell variable 'name'"
Heiko Schocher81473f62008-10-15 09:40:28 +02003675);
3676
3677#endif
wdenkfe8c2802002-11-03 00:38:21 +00003678/****************************************************************************/