1 /* vi: set sw=4 ts=4: */
3 * sh.c -- a prototype Bourne shell grammar parser
4 * Intended to follow the original Thompson and Ritchie
5 * "small and simple is beautiful" philosophy, which
6 * incidentally is a good match to today's BusyBox.
8 * Copyright (C) 2000,2001 Larry Doolittle <larry@doolittle.boa.org>
11 * The parser routines proper are all original material, first
12 * written Dec 2000 and Jan 2001 by Larry Doolittle.
13 * The execution engine, the builtins, and much of the underlying
14 * support has been adapted from busybox-0.49pre's lash,
15 * which is Copyright (C) 2000 by Lineo, Inc., and
16 * written by Erik Andersen <andersen@lineo.com>, <andersee@debian.org>.
17 * That, in turn, is based in part on ladsh.c, by Michael K. Johnson and
18 * Erik W. Troan, which they placed in the public domain. I don't know
19 * how much of the Johnson/Troan code has survived the repeated rewrites.
21 * simple_itoa() was lifted from boa-0.93.15
22 * b_addchr() derived from similar w_addchar function in glibc-2.2
23 * setup_redirect(), redirect_opt_num(), and big chunks of main()
24 * and many builtins derived from contributions by Erik Andersen
25 * miscellaneous bugfixes from Matt Kraai
27 * There are two big (and related) architecture differences between
28 * this parser and the lash parser. One is that this version is
29 * actually designed from the ground up to understand nearly all
30 * of the Bourne grammar. The second, consequential change is that
31 * the parser and input reader have been turned inside out. Now,
32 * the parser is in control, and asks for input as needed. The old
33 * way had the input reader in control, and it asked for parsing to
34 * take place as needed. The new way makes it much easier to properly
35 * handle the recursion implicit in the various substitutions, especially
36 * across continuation lines.
38 * Bash grammar not implemented: (how many of these were in original sh?)
39 * $@ (those sure look like weird quoting rules)
41 * ! negation operator for pipes
42 * &> and >& redirection of stdout+stderr
45 * fancy forms of Parameter Expansion
47 * Arithmetic Expansion
48 * <(list) and >(list) Process Substitution
49 * reserved words: case, esac, select, function
50 * Here Documents ( << word )
53 * job handling woefully incomplete and buggy
54 * reserved word execution woefully incomplete and buggy
56 * port selected bugfixes from post-0.49 busybox lash - done?
57 * finish implementing reserved words: for, while, until, do, done
58 * change { and } from special chars to reserved words
59 * builtins: break, continue, eval, return, set, trap, ulimit
61 * handle children going into background
62 * clean up recognition of null pipes
63 * check setting of global_argc and global_argv
64 * control-C handling, probably with longjmp
65 * follow IFS rules more precisely, including update semantics
66 * figure out what to do with backslash-newline
67 * explain why we use signal instead of sigaction
68 * propagate syntax errors, die on resource errors?
69 * continuation lines, both explicit and implicit - done?
70 * memory leak finding and plugging - done?
71 * more testing, especially quoting rules and redirection
72 * document how quoting rules not precisely followed for variable assignments
73 * maybe change map[] to use 2-bit entries
74 * (eventually) remove all the printf's
76 * This program is free software; you can redistribute it and/or modify
77 * it under the terms of the GNU General Public License as published by
78 * the Free Software Foundation; either version 2 of the License, or
79 * (at your option) any later version.
81 * This program is distributed in the hope that it will be useful,
82 * but WITHOUT ANY WARRANTY; without even the implied warranty of
83 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
84 * General Public License for more details.
86 * You should have received a copy of the GNU General Public License
87 * along with this program; if not, write to the Free Software
88 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
92 #include <malloc.h> /* malloc, free, realloc*/
93 #include <linux/ctype.h> /* isalpha, isdigit */
94 #include <common.h> /* readline */
96 #include <command.h> /* find_cmd */
97 #include <cmd_bootm.h> /* do_bootd */
99 #ifdef CFG_HUSH_PARSER
101 #include <ctype.h> /* isalpha, isdigit */
102 #include <unistd.h> /* getpid */
103 #include <stdlib.h> /* getenv, atoi */
104 #include <string.h> /* strchr */
105 #include <stdio.h> /* popen etc. */
106 #include <glob.h> /* glob, of course */
107 #include <stdarg.h> /* va_list */
110 #include <getopt.h> /* should be pretty obvious */
112 #include <sys/stat.h> /* ulimit */
113 #include <sys/types.h>
114 #include <sys/wait.h>
117 /* #include <dmalloc.h> */
118 /* #define DEBUG_SHELL */
124 #define applet_name "hush"
125 #include "standalone.h"
126 #define hush_main main
127 #undef CONFIG_FEATURE_SH_FANCY_PROMPT
131 #define SPECIAL_VAR_SYMBOL 03
133 #define FLAG_EXIT_FROM_LOOP 1
134 #define FLAG_PARSE_SEMICOLON (1 << 1) /* symbol ';' is special for parser */
135 #define FLAG_REPARSING (1 << 2) /* >= 2nd pass */
140 #define EXIT_SUCCESS 0
142 #define syntax() syntax_err()
143 #define xstrdup strdup
144 #define error_msg printf
148 REDIRECT_OVERWRITE
= 2,
154 /* The descrip member of this structure is only used to make debugging
156 struct {int mode
; int default_fd
; char *descrip
;} redir_table
[] = {
158 { O_RDONLY
, 0, "<" },
159 { O_CREAT
|O_TRUNC
|O_WRONLY
, 1, ">" },
160 { O_CREAT
|O_APPEND
|O_WRONLY
, 1, ">>" },
161 { O_RDONLY
, -1, "<<" },
173 /* might eventually control execution */
190 #define FLAG_END (1<<RES_NONE)
191 #define FLAG_IF (1<<RES_IF)
192 #define FLAG_THEN (1<<RES_THEN)
193 #define FLAG_ELIF (1<<RES_ELIF)
194 #define FLAG_ELSE (1<<RES_ELSE)
195 #define FLAG_FI (1<<RES_FI)
196 #define FLAG_FOR (1<<RES_FOR)
197 #define FLAG_WHILE (1<<RES_WHILE)
198 #define FLAG_UNTIL (1<<RES_UNTIL)
199 #define FLAG_DO (1<<RES_DO)
200 #define FLAG_DONE (1<<RES_DONE)
201 #define FLAG_IN (1<<RES_IN)
202 #define FLAG_START (1<<RES_XXXX)
204 /* This holds pointers to the various results of parsing */
206 struct child_prog
*child
;
207 struct pipe
*list_head
;
210 struct redir_struct
*pending_redirect
;
213 int old_flag
; /* for figuring out valid reserved words */
214 struct p_context
*stack
;
215 int type
; /* define type of parser : ";$" common or special symbol */
216 /* How about quoting status? */
220 struct redir_struct
{
221 redir_type type
; /* type of redirection */
222 int fd
; /* file descriptor being redirected */
223 int dup
; /* -1, or file descriptor being duplicated */
224 struct redir_struct
*next
; /* pointer to the next redirect in the list */
225 glob_t word
; /* *word.gl_pathv is the filename */
231 pid_t pid
; /* 0 if exited */
233 char **argv
; /* program name and arguments */
235 int argc
; /* number of program arguments */
237 struct pipe
*group
; /* if non-NULL, first in group or subshell */
239 int subshell
; /* flag, non-zero if group must be forked */
240 struct redir_struct
*redirects
; /* I/O redirections */
241 glob_t glob_result
; /* result of parameter globbing */
242 int is_stopped
; /* is the program currently running? */
243 struct pipe
*family
; /* pointer back to the child's parent pipe */
245 int sp
; /* number of SPECIAL_VAR_SYMBOL */
251 int jobid
; /* job number */
253 int num_progs
; /* total number of programs in job */
255 int running_progs
; /* number of programs running */
256 char *text
; /* name of job */
257 char *cmdbuf
; /* buffer various argv's point into */
258 pid_t pgrp
; /* process group ID for the job */
260 struct child_prog
*progs
; /* array of commands in pipe */
261 struct pipe
*next
; /* to track background commands */
263 int stopped_progs
; /* number of programs alive, but stopped */
264 int job_context
; /* bitmask defining current context */
266 pipe_style followup
; /* PIPE_BG, PIPE_SEQ, PIPE_OR, PIPE_AND */
267 reserved_style r_mode
; /* supports if, for, while, until */
273 struct close_me
*next
;
282 struct variables
*next
;
285 /* globals, connect us to the outside world
286 * the first three support $?, $#, and $1 */
289 unsigned int global_argc
;
291 unsigned int last_return_code
;
293 extern char **environ
; /* This is in <unistd.h>, but protected with __USE_GNU */
296 /* "globals" within this file */
298 static char map
[256];
300 static int fake_mode
;
301 static int interactive
;
302 static struct close_me
*close_me_head
;
303 static const char *cwd
;
304 static struct pipe
*job_list
;
305 static unsigned int last_bg_pid
;
306 static unsigned int last_jobid
;
307 static unsigned int shell_terminal
;
310 struct variables shell_ver
= { "HUSH_VERSION", "0.01", 1, 1, 0 };
311 struct variables
*top_vars
= &shell_ver
;
313 static int flag_repeat
= 0;
314 static int do_repeat
= 0;
315 static struct variables
*top_vars
;
316 #endif /*__U_BOOT__ */
318 #define B_CHUNK (100)
328 #define NULL_O_STRING {NULL,0,0,0,0}
329 /* used for initialization:
330 o_string foo = NULL_O_STRING; */
332 /* I can almost use ordinary FILE *. Is open_memstream() universally
333 * available? Where is it documented? */
344 int (*get
) (struct in_str
*);
345 int (*peek
) (struct in_str
*);
347 #define b_getch(input) ((input)->get(input))
348 #define b_peek(input) ((input)->peek(input))
351 #define JOB_STATUS_FORMAT "[%d] %-22s %.40s\n"
353 struct built_in_command
{
354 char *cmd
; /* name */
355 char *descr
; /* description */
356 int (*function
) (struct child_prog
*); /* function ptr */
360 /* This should be in utility.c */
363 static void debug_printf(const char *format
, ...)
366 va_start(args
, format
);
367 vfprintf(stderr
, format
, args
);
371 #define debug_printf printf /* U-Boot debug flag */
374 static inline void debug_printf(const char *format
, ...) { }
376 #define final_printf debug_printf
379 static void syntax_err(void) {
380 printf("syntax error\n");
383 static void __syntax(char *file
, int line
) {
384 error_msg("syntax error %s:%d", file
, line
);
386 #define syntax() __syntax(__FILE__, __LINE__)
390 static void *xmalloc(size_t size
);
391 static void *xrealloc(void *ptr
, size_t size
);
393 /* Index of subroutines: */
394 /* function prototypes for builtins */
395 static int builtin_cd(struct child_prog
*child
);
396 static int builtin_env(struct child_prog
*child
);
397 static int builtin_eval(struct child_prog
*child
);
398 static int builtin_exec(struct child_prog
*child
);
399 static int builtin_exit(struct child_prog
*child
);
400 static int builtin_export(struct child_prog
*child
);
401 static int builtin_fg_bg(struct child_prog
*child
);
402 static int builtin_help(struct child_prog
*child
);
403 static int builtin_jobs(struct child_prog
*child
);
404 static int builtin_pwd(struct child_prog
*child
);
405 static int builtin_read(struct child_prog
*child
);
406 static int builtin_set(struct child_prog
*child
);
407 static int builtin_shift(struct child_prog
*child
);
408 static int builtin_source(struct child_prog
*child
);
409 static int builtin_umask(struct child_prog
*child
);
410 static int builtin_unset(struct child_prog
*child
);
411 static int builtin_not_written(struct child_prog
*child
);
413 /* o_string manipulation: */
414 static int b_check_space(o_string
*o
, int len
);
415 static int b_addchr(o_string
*o
, int ch
);
416 static void b_reset(o_string
*o
);
417 static int b_addqchr(o_string
*o
, int ch
, int quote
);
418 static int b_adduint(o_string
*o
, unsigned int i
);
419 /* in_str manipulations: */
420 static int static_get(struct in_str
*i
);
421 static int static_peek(struct in_str
*i
);
422 static int file_get(struct in_str
*i
);
423 static int file_peek(struct in_str
*i
);
425 static void setup_file_in_str(struct in_str
*i
, FILE *f
);
427 static void setup_file_in_str(struct in_str
*i
);
429 static void setup_string_in_str(struct in_str
*i
, const char *s
);
431 /* close_me manipulations: */
432 static void mark_open(int fd
);
433 static void mark_closed(int fd
);
434 static void close_all(void);
436 /* "run" the final data structures: */
437 static char *indenter(int i
);
438 static int free_pipe_list(struct pipe
*head
, int indent
);
439 static int free_pipe(struct pipe
*pi
, int indent
);
440 /* really run the final data structures: */
442 static int setup_redirects(struct child_prog
*prog
, int squirrel
[]);
444 static int run_list_real(struct pipe
*pi
);
446 static void pseudo_exec(struct child_prog
*child
) __attribute__ ((noreturn
));
448 static int run_pipe_real(struct pipe
*pi
);
449 /* extended glob support: */
451 static int globhack(const char *src
, int flags
, glob_t
*pglob
);
452 static int glob_needed(const char *s
);
453 static int xglob(o_string
*dest
, int flags
, glob_t
*pglob
);
455 /* variable assignment: */
456 static int is_assignment(const char *s
);
457 /* data structure manipulation: */
459 static int setup_redirect(struct p_context
*ctx
, int fd
, redir_type style
, struct in_str
*input
);
461 static void initialize_context(struct p_context
*ctx
);
462 static int done_word(o_string
*dest
, struct p_context
*ctx
);
463 static int done_command(struct p_context
*ctx
);
464 static int done_pipe(struct p_context
*ctx
, pipe_style type
);
465 /* primary string parsing: */
467 static int redirect_dup_num(struct in_str
*input
);
468 static int redirect_opt_num(o_string
*o
);
469 static int process_command_subs(o_string
*dest
, struct p_context
*ctx
, struct in_str
*input
, int subst_end
);
470 static int parse_group(o_string
*dest
, struct p_context
*ctx
, struct in_str
*input
, int ch
);
472 static char *lookup_param(char *src
);
473 static char *make_string(char **inp
);
474 static int handle_dollar(o_string
*dest
, struct p_context
*ctx
, struct in_str
*input
);
476 static int parse_string(o_string
*dest
, struct p_context
*ctx
, const char *src
);
478 static int parse_stream(o_string
*dest
, struct p_context
*ctx
, struct in_str
*input0
, int end_trigger
);
480 static int parse_stream_outer(struct in_str
*inp
, int flag
);
482 static int parse_string_outer(const char *s
, int flag
);
483 static int parse_file_outer(FILE *f
);
486 /* job management: */
487 static int checkjobs(struct pipe
* fg_pipe
);
488 static void insert_bg_job(struct pipe
*pi
);
489 static void remove_bg_job(struct pipe
*pi
);
491 /* local variable support */
492 static char **make_list_in(char **inp
, char *name
);
493 static char *insert_var_value(char *inp
);
494 static char *get_local_var(const char *var
);
496 static void unset_local_var(const char *name
);
498 static int set_local_var(const char *s
, int flg_export
);
501 /* Table of built-in functions. They can be forked or not, depending on
502 * context: within pipes, they fork. As simple commands, they do not.
503 * When used in non-forking context, they can change global variables
504 * in the parent shell process. If forked, of course they can not.
505 * For example, 'unset foo | whatever' will parse and run, but foo will
506 * still be set at the end. */
507 static struct built_in_command bltins
[] = {
508 {"bg", "Resume a job in the background", builtin_fg_bg
},
509 {"break", "Exit for, while or until loop", builtin_not_written
},
510 {"cd", "Change working directory", builtin_cd
},
511 {"continue", "Continue for, while or until loop", builtin_not_written
},
512 {"env", "Print all environment variables", builtin_env
},
513 {"eval", "Construct and run shell command", builtin_eval
},
514 {"exec", "Exec command, replacing this shell with the exec'd process",
516 {"exit", "Exit from shell()", builtin_exit
},
517 {"export", "Set environment variable", builtin_export
},
518 {"fg", "Bring job into the foreground", builtin_fg_bg
},
519 {"jobs", "Lists the active jobs", builtin_jobs
},
520 {"pwd", "Print current directory", builtin_pwd
},
521 {"read", "Input environment variable", builtin_read
},
522 {"return", "Return from a function", builtin_not_written
},
523 {"set", "Set/unset shell local variables", builtin_set
},
524 {"shift", "Shift positional parameters", builtin_shift
},
525 {"trap", "Trap signals", builtin_not_written
},
526 {"ulimit","Controls resource limits", builtin_not_written
},
527 {"umask","Sets file creation mask", builtin_umask
},
528 {"unset", "Unset environment variable", builtin_unset
},
529 {".", "Source-in and run commands in a file", builtin_source
},
530 {"help", "List shell built-in commands", builtin_help
},
534 static const char *set_cwd(void)
537 cwd
= NULL
; /* xgetcwd(arg) called free(arg) */
538 cwd
= xgetcwd((char *)cwd
);
544 /* built-in 'eval' handler */
545 static int builtin_eval(struct child_prog
*child
)
548 int rcode
= EXIT_SUCCESS
;
550 if (child
->argv
[1]) {
551 str
= make_string(child
->argv
+ 1);
552 parse_string_outer(str
, FLAG_EXIT_FROM_LOOP
|
553 FLAG_PARSE_SEMICOLON
);
555 rcode
= last_return_code
;
560 /* built-in 'cd <path>' handler */
561 static int builtin_cd(struct child_prog
*child
)
564 if (child
->argv
[1] == NULL
)
565 newdir
= getenv("HOME");
567 newdir
= child
->argv
[1];
569 printf("cd: %s: %s\n", newdir
, strerror(errno
));
576 /* built-in 'env' handler */
577 static int builtin_env(struct child_prog
*dummy
)
580 if (e
== NULL
) return EXIT_FAILURE
;
587 /* built-in 'exec' handler */
588 static int builtin_exec(struct child_prog
*child
)
590 if (child
->argv
[1] == NULL
)
591 return EXIT_SUCCESS
; /* Really? */
597 /* built-in 'exit' handler */
598 static int builtin_exit(struct child_prog
*child
)
600 if (child
->argv
[1] == NULL
)
601 exit(last_return_code
);
602 exit (atoi(child
->argv
[1]));
605 /* built-in 'export VAR=value' handler */
606 static int builtin_export(struct child_prog
*child
)
609 char *name
= child
->argv
[1];
612 return (builtin_env(child
));
618 char *value
= strchr(name
, '=');
622 /* They are exporting something without an =VALUE */
624 value
= get_local_var(name
);
626 size_t ln
= strlen(name
);
628 tmp
= realloc(name
, ln
+strlen(value
)+2);
632 sprintf(tmp
+ln
, "=%s", value
);
636 /* bash does not return an error when trying to export
637 * an undefined variable. Do likewise. */
643 perror_msg("export");
645 res
= set_local_var(name
, 1);
652 /* built-in 'fg' and 'bg' handler */
653 static int builtin_fg_bg(struct child_prog
*child
)
656 struct pipe
*pi
=NULL
;
660 /* If they gave us no args, assume they want the last backgrounded task */
661 if (!child
->argv
[1]) {
662 for (pi
= job_list
; pi
; pi
= pi
->next
) {
663 if (pi
->jobid
== last_jobid
) {
668 error_msg("%s: no current job", child
->argv
[0]);
672 if (sscanf(child
->argv
[1], "%%%d", &jobnum
) != 1) {
673 error_msg("%s: bad argument '%s'", child
->argv
[0], child
->argv
[1]);
676 for (pi
= job_list
; pi
; pi
= pi
->next
) {
677 if (pi
->jobid
== jobnum
) {
682 error_msg("%s: %d: no such job", child
->argv
[0], jobnum
);
687 if (*child
->argv
[0] == 'f') {
688 /* Put the job into the foreground. */
689 tcsetpgrp(shell_terminal
, pi
->pgrp
);
692 /* Restart the processes in the job */
693 for (i
= 0; i
< pi
->num_progs
; i
++)
694 pi
->progs
[i
].is_stopped
= 0;
696 if ( (i
=kill(- pi
->pgrp
, SIGCONT
)) < 0) {
700 perror_msg("kill (SIGCONT)");
704 pi
->stopped_progs
= 0;
708 /* built-in 'help' handler */
709 static int builtin_help(struct child_prog
*dummy
)
711 struct built_in_command
*x
;
713 printf("\nBuilt-in commands:\n");
714 printf("-------------------\n");
715 for (x
= bltins
; x
->cmd
; x
++) {
718 printf("%s\t%s\n", x
->cmd
, x
->descr
);
724 /* built-in 'jobs' handler */
725 static int builtin_jobs(struct child_prog
*child
)
730 for (job
= job_list
; job
; job
= job
->next
) {
731 if (job
->running_progs
== job
->stopped_progs
)
732 status_string
= "Stopped";
734 status_string
= "Running";
736 printf(JOB_STATUS_FORMAT
, job
->jobid
, status_string
, job
->text
);
742 /* built-in 'pwd' handler */
743 static int builtin_pwd(struct child_prog
*dummy
)
749 /* built-in 'read VAR' handler */
750 static int builtin_read(struct child_prog
*child
)
754 if (child
->argv
[1]) {
758 string
[0] = 0; /* In case stdin has only EOF */
760 fgets(string
, sizeof(string
), stdin
);
762 var
= malloc(strlen(child
->argv
[1])+strlen(string
)+2);
764 sprintf(var
, "%s=%s", child
->argv
[1], string
);
765 res
= set_local_var(var
, 0);
769 fprintf(stderr
, "read: %m\n");
770 free(var
); /* So not move up to avoid breaking errno */
773 do res
=getchar(); while(res
!='\n' && res
!=EOF
);
778 /* built-in 'set VAR=value' handler */
779 static int builtin_set(struct child_prog
*child
)
781 char *temp
= child
->argv
[1];
785 for(e
= top_vars
; e
; e
=e
->next
)
786 printf("%s=%s\n", e
->name
, e
->value
);
788 set_local_var(temp
, 0);
794 /* Built-in 'shift' handler */
795 static int builtin_shift(struct child_prog
*child
)
798 if (child
->argv
[1]) {
799 n
=atoi(child
->argv
[1]);
801 if (n
>=0 && n
<global_argc
) {
802 /* XXX This probably breaks $0 */
811 /* Built-in '.' handler (read-in and execute commands from file) */
812 static int builtin_source(struct child_prog
*child
)
817 if (child
->argv
[1] == NULL
)
820 /* XXX search through $PATH is missing */
821 input
= fopen(child
->argv
[1], "r");
823 error_msg("Couldn't open file '%s'", child
->argv
[1]);
827 /* Now run the file */
828 /* XXX argv and argc are broken; need to save old global_argv
829 * (pointer only is OK!) on this stack frame,
830 * set global_argv=child->argv+1, recurse, and restore. */
831 mark_open(fileno(input
));
832 status
= parse_file_outer(input
);
833 mark_closed(fileno(input
));
838 static int builtin_umask(struct child_prog
*child
)
841 const char *arg
= child
->argv
[1];
844 new_umask
=strtoul(arg
, &end
, 8);
845 if (*end
!='\0' || end
== arg
) {
849 printf("%.3o\n", (unsigned int) (new_umask
=umask(0)));
855 /* built-in 'unset VAR' handler */
856 static int builtin_unset(struct child_prog
*child
)
858 /* bash returned already true */
859 unset_local_var(child
->argv
[1]);
863 static int builtin_not_written(struct child_prog
*child
)
865 printf("builtin_%s not written\n",child
->argv
[0]);
870 static int b_check_space(o_string
*o
, int len
)
872 /* It would be easy to drop a more restrictive policy
873 * in here, such as setting a maximum string length */
874 if (o
->length
+ len
> o
->maxlen
) {
875 char *old_data
= o
->data
;
876 /* assert (data == NULL || o->maxlen != 0); */
877 o
->maxlen
+= max(2*len
, B_CHUNK
);
878 o
->data
= realloc(o
->data
, 1 + o
->maxlen
);
879 if (o
->data
== NULL
) {
883 return o
->data
== NULL
;
886 static int b_addchr(o_string
*o
, int ch
)
888 debug_printf("b_addchr: %c %d %p\n", ch
, o
->length
, o
);
889 if (b_check_space(o
, 1)) return B_NOSPAC
;
890 o
->data
[o
->length
] = ch
;
892 o
->data
[o
->length
] = '\0';
896 static void b_reset(o_string
*o
)
900 if (o
->data
!= NULL
) *o
->data
= '\0';
903 static void b_free(o_string
*o
)
911 /* My analysis of quoting semantics tells me that state information
912 * is associated with a destination, not a source.
914 static int b_addqchr(o_string
*o
, int ch
, int quote
)
916 if (quote
&& strchr("*?[\\",ch
)) {
918 rc
= b_addchr(o
, '\\');
921 return b_addchr(o
, ch
);
924 /* belongs in utility.c */
925 char *simple_itoa(unsigned int i
)
927 /* 21 digits plus null terminator, good for 64-bit or smaller ints */
928 static char local
[22];
929 char *p
= &local
[21];
938 static int b_adduint(o_string
*o
, unsigned int i
)
941 char *p
= simple_itoa(i
);
942 /* no escape checking necessary */
943 do r
=b_addchr(o
, *p
++); while (r
==0 && *p
);
947 static int static_get(struct in_str
*i
)
950 if (ch
=='\0') return EOF
;
954 static int static_peek(struct in_str
*i
)
960 static inline void cmdedit_set_initial_prompt(void)
962 #ifndef CONFIG_FEATURE_SH_FANCY_PROMPT
971 static inline void setup_prompt_string(int promptmode
, char **prompt_str
)
973 debug_printf("setup_prompt_string %d ",promptmode
);
974 #ifndef CONFIG_FEATURE_SH_FANCY_PROMPT
975 /* Set up the prompt */
976 if (promptmode
== 1) {
978 PS1
=xmalloc(strlen(cwd
)+4);
979 sprintf(PS1
, "%s %s", cwd
, ( geteuid() != 0 ) ? "$ ":"# ");
985 *prompt_str
= (promptmode
==1)? PS1
: PS2
;
987 debug_printf("result %s\n",*prompt_str
);
991 static void get_user_input(struct in_str
*i
)
995 static char the_command
[BUFSIZ
];
997 setup_prompt_string(i
->promptmode
, &prompt_str
);
998 #ifdef CONFIG_FEATURE_COMMAND_EDITING
1000 ** enable command line editing only while a command line
1001 ** is actually being read; otherwise, we'll end up bequeathing
1002 ** atexit() handlers and other unwanted stuff to our
1003 ** child processes (rob@sysgo.de)
1005 cmdedit_read_input(prompt_str
, the_command
);
1007 fputs(prompt_str
, stdout
);
1009 the_command
[0]=fgetc(i
->file
);
1010 the_command
[1]='\0';
1015 extern char console_buffer
[CFG_CBSIZE
];
1017 static char the_command
[CFG_CBSIZE
];
1020 if (i
->promptmode
== 1) {
1021 n
= readline(CFG_PROMPT
);
1023 n
= readline(CFG_PROMPT_HUSH_PS2
);
1029 n
= strlen(console_buffer
);
1030 console_buffer
[n
] = '\n';
1031 console_buffer
[n
+1]= '\0';
1032 if (had_ctrlc()) flag_repeat
= 0;
1035 if (i
->promptmode
== 1) {
1036 if (console_buffer
[0] == '\n'&& flag_repeat
== 0) {
1037 strcpy(the_command
,console_buffer
);
1040 if (console_buffer
[0] != '\n') {
1041 strcpy(the_command
,console_buffer
);
1051 if (console_buffer
[0] != '\n') {
1052 if (strlen(the_command
) + strlen(console_buffer
)
1054 n
= strlen(the_command
);
1055 the_command
[n
-1] = ' ';
1056 strcpy(&the_command
[n
],console_buffer
);
1059 the_command
[0] = '\n';
1060 the_command
[1] = '\0';
1064 if (i
->__promptme
== 0) {
1065 the_command
[0] = '\n';
1066 the_command
[1] = '\0';
1068 i
->p
= console_buffer
;
1073 /* This is the magic location that prints prompts
1074 * and gets data back from the user */
1075 static int file_get(struct in_str
*i
)
1080 /* If there is data waiting, eat it up */
1081 if (i
->p
&& *i
->p
) {
1084 /* need to double check i->file because we might be doing something
1085 * more complicated by now, like sourcing or substituting. */
1087 if (i
->__promptme
&& interactive
&& i
->file
== stdin
) {
1088 while(! i
->p
|| (interactive
&& strlen(i
->p
)==0) ) {
1090 while(! i
->p
|| strlen(i
->p
)==0 ) {
1098 if (i
->p
&& *i
->p
) {
1103 ch
= fgetc(i
->file
);
1107 debug_printf("b_getch: got a %d\n", ch
);
1110 if (ch
== '\n') i
->__promptme
=1;
1115 /* All the callers guarantee this routine will never be
1116 * used right after a newline, so prompting is not needed.
1118 static int file_peek(struct in_str
*i
)
1121 if (i
->p
&& *i
->p
) {
1126 i
->peek_buf
[0] = fgetc(i
->file
);
1127 i
->peek_buf
[1] = '\0';
1129 debug_printf("b_peek: got a %d\n", *i
->p
);
1136 static void setup_file_in_str(struct in_str
*i
, FILE *f
)
1138 static void setup_file_in_str(struct in_str
*i
)
1141 i
->peek
= file_peek
;
1151 static void setup_string_in_str(struct in_str
*i
, const char *s
)
1153 i
->peek
= static_peek
;
1154 i
->get
= static_get
;
1161 static void mark_open(int fd
)
1163 struct close_me
*new = xmalloc(sizeof(struct close_me
));
1165 new->next
= close_me_head
;
1166 close_me_head
= new;
1169 static void mark_closed(int fd
)
1171 struct close_me
*tmp
;
1172 if (close_me_head
== NULL
|| close_me_head
->fd
!= fd
)
1173 error_msg_and_die("corrupt close_me");
1174 tmp
= close_me_head
;
1175 close_me_head
= close_me_head
->next
;
1179 static void close_all(void)
1182 for (c
=close_me_head
; c
; c
=c
->next
) {
1185 close_me_head
= NULL
;
1188 /* squirrel != NULL means we squirrel away copies of stdin, stdout,
1189 * and stderr if they are redirected. */
1190 static int setup_redirects(struct child_prog
*prog
, int squirrel
[])
1193 struct redir_struct
*redir
;
1195 for (redir
=prog
->redirects
; redir
; redir
=redir
->next
) {
1196 if (redir
->dup
== -1 && redir
->word
.gl_pathv
== NULL
) {
1197 /* something went wrong in the parse. Pretend it didn't happen */
1200 if (redir
->dup
== -1) {
1201 mode
=redir_table
[redir
->type
].mode
;
1202 openfd
= open(redir
->word
.gl_pathv
[0], mode
, 0666);
1204 /* this could get lost if stderr has been redirected, but
1205 bash and ash both lose it as well (though zsh doesn't!) */
1206 perror_msg("error opening %s", redir
->word
.gl_pathv
[0]);
1210 openfd
= redir
->dup
;
1213 if (openfd
!= redir
->fd
) {
1214 if (squirrel
&& redir
->fd
< 3) {
1215 squirrel
[redir
->fd
] = dup(redir
->fd
);
1220 dup2(openfd
, redir
->fd
);
1221 if (redir
->dup
== -1)
1229 static void restore_redirects(int squirrel
[])
1232 for (i
=0; i
<3; i
++) {
1235 /* No error checking. I sure wouldn't know what
1236 * to do with an error if I found one! */
1244 /* XXX no exit() here. If you don't exec, use _exit instead.
1245 * The at_exit handlers apparently confuse the calling process,
1246 * in particular stdin handling. Not sure why? */
1247 static void pseudo_exec(struct child_prog
*child
)
1251 struct built_in_command
*x
;
1253 for (i
=0; is_assignment(child
->argv
[i
]); i
++) {
1254 debug_printf("pid %d environment modification: %s\n",getpid(),child
->argv
[i
]);
1255 p
= insert_var_value(child
->argv
[i
]);
1257 if (p
!= child
->argv
[i
]) free(p
);
1259 child
->argv
+=i
; /* XXX this hack isn't so horrible, since we are about
1260 to exit, and therefore don't need to keep data
1261 structures consistent for free() use. */
1262 /* If a variable is assigned in a forest, and nobody listens,
1263 * was it ever really set?
1265 if (child
->argv
[0] == NULL
) {
1266 _exit(EXIT_SUCCESS
);
1270 * Check if the command matches any of the builtins.
1271 * Depending on context, this might be redundant. But it's
1272 * easier to waste a few CPU cycles than it is to figure out
1273 * if this is one of those cases.
1275 for (x
= bltins
; x
->cmd
; x
++) {
1276 if (strcmp(child
->argv
[0], x
->cmd
) == 0 ) {
1277 debug_printf("builtin exec %s\n", child
->argv
[0]);
1278 rcode
= x
->function(child
);
1284 /* Check if the command matches any busybox internal commands
1286 * FIXME: This feature is not 100% safe, since
1287 * BusyBox is not fully reentrant, so we have no guarantee the things
1288 * from the .bss are still zeroed, or that things from .data are still
1289 * at their defaults. We could exec ourself from /proc/self/exe, but I
1290 * really dislike relying on /proc for things. We could exec ourself
1291 * from global_argv[0], but if we are in a chroot, we may not be able
1292 * to find ourself... */
1293 #ifdef CONFIG_FEATURE_SH_STANDALONE_SHELL
1296 char** argv_l
=child
->argv
;
1297 char *name
= child
->argv
[0];
1299 #ifdef CONFIG_FEATURE_SH_APPLETS_ALWAYS_WIN
1300 /* Following discussions from November 2000 on the busybox mailing
1301 * list, the default configuration, (without
1302 * get_last_path_component()) lets the user force use of an
1303 * external command by specifying the full (with slashes) filename.
1304 * If you enable CONFIG_FEATURE_SH_APPLETS_ALWAYS_WIN then applets
1305 * _aways_ override external commands, so if you want to run
1306 * /bin/cat, it will use BusyBox cat even if /bin/cat exists on the
1307 * filesystem and is _not_ busybox. Some systems may want this,
1309 name
= get_last_path_component(name
);
1311 /* Count argc for use in a second... */
1312 for(argc_l
=0;*argv_l
!=NULL
; argv_l
++, argc_l
++);
1314 debug_printf("running applet %s\n", name
);
1315 run_applet_by_name(name
, argc_l
, child
->argv
);
1318 debug_printf("exec of %s\n",child
->argv
[0]);
1319 execvp(child
->argv
[0],child
->argv
);
1320 perror_msg("couldn't exec: %s",child
->argv
[0]);
1322 } else if (child
->group
) {
1323 debug_printf("runtime nesting to group\n");
1324 interactive
=0; /* crucial!!!! */
1325 rcode
= run_list_real(child
->group
);
1326 /* OK to leak memory by not calling free_pipe_list,
1327 * since this process is about to exit */
1330 /* Can happen. See what bash does with ">foo" by itself. */
1331 debug_printf("trying to pseudo_exec null command\n");
1332 _exit(EXIT_SUCCESS
);
1336 static void insert_bg_job(struct pipe
*pi
)
1338 struct pipe
*thejob
;
1340 /* Linear search for the ID of the job to use */
1342 for (thejob
= job_list
; thejob
; thejob
= thejob
->next
)
1343 if (thejob
->jobid
>= pi
->jobid
)
1344 pi
->jobid
= thejob
->jobid
+ 1;
1346 /* add thejob to the list of running jobs */
1348 thejob
= job_list
= xmalloc(sizeof(*thejob
));
1350 for (thejob
= job_list
; thejob
->next
; thejob
= thejob
->next
) /* nothing */;
1351 thejob
->next
= xmalloc(sizeof(*thejob
));
1352 thejob
= thejob
->next
;
1355 /* physically copy the struct job */
1356 memcpy(thejob
, pi
, sizeof(struct pipe
));
1357 thejob
->next
= NULL
;
1358 thejob
->running_progs
= thejob
->num_progs
;
1359 thejob
->stopped_progs
= 0;
1360 thejob
->text
= xmalloc(BUFSIZ
); /* cmdedit buffer size */
1362 /*if (pi->progs[0] && pi->progs[0].argv && pi->progs[0].argv[0]) */
1364 char *bar
=thejob
->text
;
1365 char **foo
=pi
->progs
[0].argv
;
1366 while(foo
&& *foo
) {
1367 bar
+= sprintf(bar
, "%s ", *foo
++);
1371 /* we don't wait for background thejobs to return -- append it
1372 to the list of backgrounded thejobs and leave it alone */
1373 printf("[%d] %d\n", thejob
->jobid
, thejob
->progs
[0].pid
);
1374 last_bg_pid
= thejob
->progs
[0].pid
;
1375 last_jobid
= thejob
->jobid
;
1378 /* remove a backgrounded job */
1379 static void remove_bg_job(struct pipe
*pi
)
1381 struct pipe
*prev_pipe
;
1383 if (pi
== job_list
) {
1384 job_list
= pi
->next
;
1386 prev_pipe
= job_list
;
1387 while (prev_pipe
->next
!= pi
)
1388 prev_pipe
= prev_pipe
->next
;
1389 prev_pipe
->next
= pi
->next
;
1392 last_jobid
= job_list
->jobid
;
1396 pi
->stopped_progs
= 0;
1401 /* Checks to see if any processes have exited -- if they
1402 have, figure out why and see if a job has completed */
1403 static int checkjobs(struct pipe
* fg_pipe
)
1411 attributes
= WUNTRACED
;
1412 if (fg_pipe
==NULL
) {
1413 attributes
|= WNOHANG
;
1416 while ((childpid
= waitpid(-1, &status
, attributes
)) > 0) {
1419 for (i
=0; i
< fg_pipe
->num_progs
; i
++) {
1420 if (fg_pipe
->progs
[i
].pid
== childpid
) {
1421 if (i
==fg_pipe
->num_progs
-1)
1422 rcode
=WEXITSTATUS(status
);
1423 (fg_pipe
->num_progs
)--;
1429 for (pi
= job_list
; pi
; pi
= pi
->next
) {
1431 while (prognum
< pi
->num_progs
&& pi
->progs
[prognum
].pid
!= childpid
) {
1434 if (prognum
< pi
->num_progs
)
1439 debug_printf("checkjobs: pid %d was not in our list!\n", childpid
);
1443 if (WIFEXITED(status
) || WIFSIGNALED(status
)) {
1445 pi
->running_progs
--;
1446 pi
->progs
[prognum
].pid
= 0;
1448 if (!pi
->running_progs
) {
1449 printf(JOB_STATUS_FORMAT
, pi
->jobid
, "Done", pi
->text
);
1454 pi
->stopped_progs
++;
1455 pi
->progs
[prognum
].is_stopped
= 1;
1458 /* Printing this stuff is a pain, since it tends to
1459 * overwrite the prompt an inconveinient moments. So
1461 if (pi
->stopped_progs
== pi
->num_progs
) {
1462 printf("\n"JOB_STATUS_FORMAT
, pi
->jobid
, "Stopped", pi
->text
);
1468 if (childpid
== -1 && errno
!= ECHILD
)
1469 perror_msg("waitpid");
1471 /* move the shell to the foreground */
1472 /*if (interactive && tcsetpgrp(shell_terminal, getpgid(0))) */
1473 /* perror_msg("tcsetpgrp-2"); */
1477 /* Figure out our controlling tty, checking in order stderr,
1478 * stdin, and stdout. If check_pgrp is set, also check that
1479 * we belong to the foreground process group associated with
1480 * that tty. The value of shell_terminal is needed in order to call
1481 * tcsetpgrp(shell_terminal, ...); */
1482 void controlling_tty(int check_pgrp
)
1486 if ((curpgrp
= tcgetpgrp(shell_terminal
= 2)) < 0
1487 && (curpgrp
= tcgetpgrp(shell_terminal
= 0)) < 0
1488 && (curpgrp
= tcgetpgrp(shell_terminal
= 1)) < 0)
1489 goto shell_terminal_error
;
1491 if (check_pgrp
&& curpgrp
!= getpgid(0))
1492 goto shell_terminal_error
;
1496 shell_terminal_error
:
1497 shell_terminal
= -1;
1502 /* run_pipe_real() starts all the jobs, but doesn't wait for anything
1503 * to finish. See checkjobs().
1505 * return code is normally -1, when the caller has to wait for children
1506 * to finish to determine the exit status of the pipe. If the pipe
1507 * is a simple builtin command, however, the action is done by the
1508 * time run_pipe_real returns, and the exit code is provided as the
1511 * The input of the pipe is always stdin, the output is always
1512 * stdout. The outpipe[] mechanism in BusyBox-0.48 lash is bogus,
1513 * because it tries to avoid running the command substitution in
1514 * subshell, when that is in fact necessary. The subshell process
1515 * now has its stdout directed to the input of the appropriate pipe,
1516 * so this routine is noticeably simpler.
1518 static int run_pipe_real(struct pipe
*pi
)
1522 int nextin
, nextout
;
1523 int pipefds
[2]; /* pipefds[0] is for reading */
1524 struct child_prog
*child
;
1525 struct built_in_command
*x
;
1528 /* Avoid longjmp clobbering */
1536 int flag
= do_repeat
? CMD_FLAG_REPEAT
: 0;
1537 struct child_prog
*child
;
1541 /* Avoid longjmp clobbering */
1546 #endif /* __U_BOOT__ */
1553 /* Check if this is a simple builtin (not part of a pipe).
1554 * Builtins within pipes have to fork anyway, and are handled in
1555 * pseudo_exec. "echo foo | read bar" doesn't work on bash, either.
1557 if (pi
->num_progs
== 1) child
= & (pi
->progs
[0]);
1559 if (pi
->num_progs
== 1 && child
->group
&& child
->subshell
== 0) {
1560 int squirrel
[] = {-1, -1, -1};
1562 debug_printf("non-subshell grouping\n");
1563 setup_redirects(child
, squirrel
);
1564 /* XXX could we merge code with following builtin case,
1565 * by creating a pseudo builtin that calls run_list_real? */
1566 rcode
= run_list_real(child
->group
);
1567 restore_redirects(squirrel
);
1569 if (pi
->num_progs
== 1 && child
->group
) {
1571 debug_printf("non-subshell grouping\n");
1572 rcode
= run_list_real(child
->group
);
1575 } else if (pi
->num_progs
== 1 && pi
->progs
[0].argv
!= NULL
) {
1576 for (i
=0; is_assignment(child
->argv
[i
]); i
++) { /* nothing */ }
1577 if (i
!=0 && child
->argv
[i
]==NULL
) {
1578 /* assignments, but no command: set the local environment */
1579 for (i
=0; child
->argv
[i
]!=NULL
; i
++) {
1581 /* Ok, this case is tricky. We have to decide if this is a
1582 * local variable, or an already exported variable. If it is
1583 * already exported, we have to export the new value. If it is
1584 * not exported, we need only set this as a local variable.
1585 * This junk is all to decide whether or not to export this
1589 name
= xstrdup(child
->argv
[i
]);
1590 debug_printf("Local environment set: %s\n", name
);
1591 value
= strchr(name
, '=');
1595 if ( get_local_var(name
)) {
1600 p
= insert_var_value(child
->argv
[i
]);
1601 set_local_var(p
, export_me
);
1602 if (p
!= child
->argv
[i
]) free(p
);
1604 return EXIT_SUCCESS
; /* don't worry about errors in set_local_var() yet */
1606 for (i
= 0; is_assignment(child
->argv
[i
]); i
++) {
1607 p
= insert_var_value(child
->argv
[i
]);
1611 set_local_var(p
, 0);
1613 if (p
!= child
->argv
[i
]) {
1621 str
= make_string((child
->argv
+ i
));
1622 parse_string_outer(str
, FLAG_EXIT_FROM_LOOP
| FLAG_REPARSING
);
1624 return last_return_code
;
1627 for (x
= bltins
; x
->cmd
; x
++) {
1628 if (strcmp(child
->argv
[i
], x
->cmd
) == 0 ) {
1629 int squirrel
[] = {-1, -1, -1};
1631 if (x
->function
== builtin_exec
&& child
->argv
[i
+1]==NULL
) {
1632 debug_printf("magic exec\n");
1633 setup_redirects(child
,NULL
);
1634 return EXIT_SUCCESS
;
1636 debug_printf("builtin inline %s\n", child
->argv
[0]);
1637 /* XXX setup_redirects acts on file descriptors, not FILEs.
1638 * This is perfect for work that comes after exec().
1639 * Is it really safe for inline use? Experimentally,
1640 * things seem to work with glibc. */
1641 setup_redirects(child
, squirrel
);
1643 /* check ";", because ,example , argv consist from
1644 * "help;flinfo" must not execute
1646 if (strchr(child
->argv
[i
], ';')) {
1647 printf ("Unknown command '%s' - try 'help' or use 'run' command\n",
1651 /* Look up command in command table */
1652 if ((cmdtp
= find_cmd(child
->argv
[i
])) == NULL
) {
1653 printf ("Unknown command '%s' - try 'help'\n", child
->argv
[i
]);
1654 return -1; /* give up after bad command */
1657 #if (CONFIG_COMMANDS & CFG_CMD_BOOTD)
1658 /* avoid "bootd" recursion */
1659 if (cmdtp
->cmd
== do_bootd
) {
1660 if (flag
& CMD_FLAG_BOOTD
) {
1661 printf ("'bootd' recursion detected\n");
1665 flag
|= CMD_FLAG_BOOTD
;
1667 #endif /* CFG_CMD_BOOTD */
1668 /* found - check max args */
1669 if ((child
->argc
- i
) > cmdtp
->maxargs
) {
1670 printf ("Usage:\n%s\n", cmdtp
->usage
);
1674 child
->argv
+=i
; /* XXX horrible hack */
1676 rcode
= x
->function(child
);
1678 /* OK - call function to do the command */
1679 rcode
= (cmdtp
->cmd
)
1680 (cmdtp
, flag
,child
->argc
-i
,&child
->argv
[i
]);
1681 if ( !cmdtp
->repeatable
)
1684 child
->argv
-=i
; /* XXX restore hack so free() can work right */
1686 restore_redirects(squirrel
);
1694 for (i
= 0; i
< pi
->num_progs
; i
++) {
1695 child
= & (pi
->progs
[i
]);
1697 /* pipes are inserted between pairs of commands */
1698 if ((i
+ 1) < pi
->num_progs
) {
1699 if (pipe(pipefds
)<0) perror_msg_and_die("pipe");
1700 nextout
= pipefds
[1];
1706 /* XXX test for failed fork()? */
1707 if (!(child
->pid
= fork())) {
1708 /* Set the handling for job control signals back to the default. */
1709 signal(SIGINT
, SIG_DFL
);
1710 signal(SIGQUIT
, SIG_DFL
);
1711 signal(SIGTERM
, SIG_DFL
);
1712 signal(SIGTSTP
, SIG_DFL
);
1713 signal(SIGTTIN
, SIG_DFL
);
1714 signal(SIGTTOU
, SIG_DFL
);
1715 signal(SIGCHLD
, SIG_DFL
);
1727 if (pipefds
[0]!=-1) {
1728 close(pipefds
[0]); /* opposite end of our output pipe */
1731 /* Like bash, explicit redirects override pipes,
1732 * and the pipe fd is available for dup'ing. */
1733 setup_redirects(child
,NULL
);
1735 if (interactive
&& pi
->followup
!=PIPE_BG
) {
1736 /* If we (the child) win the race, put ourselves in the process
1737 * group whose leader is the first process in this pipe. */
1739 pi
->pgrp
= getpid();
1741 if (setpgid(0, pi
->pgrp
) == 0) {
1742 tcsetpgrp(2, pi
->pgrp
);
1750 /* put our child in the process group whose leader is the
1751 first process in this pipe */
1753 pi
->pgrp
= child
->pid
;
1755 /* Don't check for errors. The child may be dead already,
1756 * in which case setpgid returns error code EACCES. */
1757 setpgid(child
->pid
, pi
->pgrp
);
1764 /* If there isn't another process, nextin is garbage
1765 but it doesn't matter */
1766 nextin
= pipefds
[0];
1772 static int run_list_real(struct pipe
*pi
)
1774 char *save_name
= NULL
;
1776 char **save_list
= NULL
;
1782 int rcode
=0, flag_skip
=1;
1783 int flag_restore
= 0;
1784 int if_code
=0, next_if_code
=0; /* need double-buffer to handle elif */
1785 reserved_style rmode
, skip_more_in_this_rmode
=RES_XXXX
;
1786 /* check syntax for "for" */
1787 for (rpipe
= pi
; rpipe
; rpipe
= rpipe
->next
) {
1788 if ((rpipe
->r_mode
== RES_IN
||
1789 rpipe
->r_mode
== RES_FOR
) &&
1790 (rpipe
->next
== NULL
)) {
1797 if ((rpipe
->r_mode
== RES_IN
&&
1798 (rpipe
->next
->r_mode
== RES_IN
&&
1799 rpipe
->next
->progs
->argv
!= NULL
))||
1800 (rpipe
->r_mode
== RES_FOR
&&
1801 rpipe
->next
->r_mode
!= RES_IN
)) {
1809 for (; pi
; pi
= (flag_restore
!= 0) ? rpipe
: pi
->next
) {
1810 if (pi
->r_mode
== RES_WHILE
|| pi
->r_mode
== RES_UNTIL
||
1811 pi
->r_mode
== RES_FOR
) {
1815 if ((had_ctrlc())) {
1826 debug_printf("rmode=%d if_code=%d next_if_code=%d skip_more=%d\n", rmode
, if_code
, next_if_code
, skip_more_in_this_rmode
);
1827 if (rmode
== skip_more_in_this_rmode
&& flag_skip
) {
1828 if (pi
->followup
== PIPE_SEQ
) flag_skip
=0;
1832 skip_more_in_this_rmode
= RES_XXXX
;
1833 if (rmode
== RES_THEN
|| rmode
== RES_ELSE
) if_code
= next_if_code
;
1834 if (rmode
== RES_THEN
&& if_code
) continue;
1835 if (rmode
== RES_ELSE
&& !if_code
) continue;
1836 if (rmode
== RES_ELIF
&& !if_code
) continue;
1837 if (rmode
== RES_FOR
&& pi
->num_progs
) {
1839 /* if no variable values after "in" we skip "for" */
1840 if (!pi
->next
->progs
->argv
) continue;
1841 /* create list of variable values */
1842 list
= make_list_in(pi
->next
->progs
->argv
,
1843 pi
->progs
->argv
[0]);
1845 save_name
= pi
->progs
->argv
[0];
1846 pi
->progs
->argv
[0] = NULL
;
1850 free(pi
->progs
->argv
[0]);
1854 pi
->progs
->argv
[0] = save_name
;
1856 pi
->progs
->glob_result
.gl_pathv
[0] =
1861 /* insert new value from list for variable */
1862 if (pi
->progs
->argv
[0])
1863 free(pi
->progs
->argv
[0]);
1864 pi
->progs
->argv
[0] = *list
++;
1866 pi
->progs
->glob_result
.gl_pathv
[0] =
1871 if (rmode
== RES_IN
) continue;
1872 if (rmode
== RES_DO
) {
1873 if (!flag_rep
) continue;
1875 if ((rmode
== RES_DONE
)) {
1882 if (pi
->num_progs
== 0) continue;
1884 save_num_progs
= pi
->num_progs
; /* save number of programs */
1886 rcode
= run_pipe_real(pi
);
1887 debug_printf("run_pipe_real returned %d\n",rcode
);
1890 /* We only ran a builtin: rcode was set by the return value
1891 * of run_pipe_real(), and we don't need to wait for anything. */
1892 } else if (pi
->followup
==PIPE_BG
) {
1893 /* XXX check bash's behavior with nontrivial pipes */
1894 /* XXX compute jobid */
1895 /* XXX what does bash do with attempts to background builtins? */
1897 rcode
= EXIT_SUCCESS
;
1900 /* move the new process group into the foreground */
1901 if (tcsetpgrp(shell_terminal
, pi
->pgrp
) && errno
!= ENOTTY
)
1902 perror_msg("tcsetpgrp-3");
1903 rcode
= checkjobs(pi
);
1904 /* move the shell to the foreground */
1905 if (tcsetpgrp(shell_terminal
, getpgid(0)) && errno
!= ENOTTY
)
1906 perror_msg("tcsetpgrp-4");
1908 rcode
= checkjobs(pi
);
1910 debug_printf("checkjobs returned %d\n",rcode
);
1912 last_return_code
=rcode
;
1914 last_return_code
=(rcode
== 0) ? 0 : 1;
1917 pi
->num_progs
= save_num_progs
; /* restore number of programs */
1919 if ( rmode
== RES_IF
|| rmode
== RES_ELIF
)
1920 next_if_code
=rcode
; /* can be overwritten a number of times */
1921 if (rmode
== RES_WHILE
)
1922 flag_rep
= !last_return_code
;
1923 if (rmode
== RES_UNTIL
)
1924 flag_rep
= last_return_code
;
1925 if ( (rcode
==EXIT_SUCCESS
&& pi
->followup
==PIPE_OR
) ||
1926 (rcode
!=EXIT_SUCCESS
&& pi
->followup
==PIPE_AND
) )
1927 skip_more_in_this_rmode
=rmode
;
1935 /* broken, of course, but OK for testing */
1936 static char *indenter(int i
)
1938 static char blanks
[]=" ";
1939 return &blanks
[sizeof(blanks
)-i
-1];
1942 /* return code is the exit status of the pipe */
1943 static int free_pipe(struct pipe
*pi
, int indent
)
1946 struct child_prog
*child
;
1948 struct redir_struct
*r
, *rnext
;
1950 int a
, i
, ret_code
=0;
1951 char *ind
= indenter(indent
);
1954 if (pi
->stopped_progs
> 0)
1956 final_printf("%s run pipe: (pid %d)\n",ind
,getpid());
1958 for (i
=0; i
<pi
->num_progs
; i
++) {
1959 child
= &pi
->progs
[i
];
1960 final_printf("%s command %d:\n",ind
,i
);
1962 for (a
=0,p
=child
->argv
; *p
; a
++,p
++) {
1963 final_printf("%s argv[%d] = %s\n",ind
,a
,*p
);
1966 globfree(&child
->glob_result
);
1968 for (a
= child
->argc
;a
>= 0;a
--) {
1969 free(child
->argv
[a
]);
1975 } else if (child
->group
) {
1977 final_printf("%s begin group (subshell:%d)\n",ind
, child
->subshell
);
1979 ret_code
= free_pipe_list(child
->group
,indent
+3);
1980 final_printf("%s end group\n",ind
);
1982 final_printf("%s (nil)\n",ind
);
1985 for (r
=child
->redirects
; r
; r
=rnext
) {
1986 final_printf("%s redirect %d%s", ind
, r
->fd
, redir_table
[r
->type
].descrip
);
1988 /* guard against the case >$FOO, where foo is unset or blank */
1989 if (r
->word
.gl_pathv
) {
1990 final_printf(" %s\n", *r
->word
.gl_pathv
);
1994 final_printf("&%d\n", r
->dup
);
1999 child
->redirects
=NULL
;
2002 free(pi
->progs
); /* children are an array, they get freed all at once */
2007 static int free_pipe_list(struct pipe
*head
, int indent
)
2009 int rcode
=0; /* if list has no members */
2010 struct pipe
*pi
, *next
;
2011 char *ind
= indenter(indent
);
2012 for (pi
=head
; pi
; pi
=next
) {
2013 final_printf("%s pipe reserved mode %d\n", ind
, pi
->r_mode
);
2014 rcode
= free_pipe(pi
, indent
);
2015 final_printf("%s pipe followup code %d\n", ind
, pi
->followup
);
2023 /* Select which version we will use */
2024 static int run_list(struct pipe
*pi
)
2030 rcode
= run_list_real(pi
);
2034 /* free_pipe_list has the side effect of clearing memory
2035 * In the long run that function can be merged with run_list_real,
2036 * but doing that now would hobble the debugging effort. */
2037 free_pipe_list(pi
,0);
2041 /* The API for glob is arguably broken. This routine pushes a non-matching
2042 * string into the output structure, removing non-backslashed backslashes.
2043 * If someone can prove me wrong, by performing this function within the
2044 * original glob(3) api, feel free to rewrite this routine into oblivion.
2045 * Return code (0 vs. GLOB_NOSPACE) matches glob(3).
2046 * XXX broken if the last character is '\\', check that before calling.
2049 static int globhack(const char *src
, int flags
, glob_t
*pglob
)
2054 for (cnt
=1, s
=src
; s
&& *s
; s
++) {
2055 if (*s
== '\\') s
++;
2059 if (!dest
) return GLOB_NOSPACE
;
2060 if (!(flags
& GLOB_APPEND
)) {
2061 pglob
->gl_pathv
=NULL
;
2066 pathc
= ++pglob
->gl_pathc
;
2067 pglob
->gl_pathv
= realloc(pglob
->gl_pathv
, (pathc
+1)*sizeof(*pglob
->gl_pathv
));
2068 if (pglob
->gl_pathv
== NULL
) return GLOB_NOSPACE
;
2069 pglob
->gl_pathv
[pathc
-1]=dest
;
2070 pglob
->gl_pathv
[pathc
]=NULL
;
2071 for (s
=src
; s
&& *s
; s
++, dest
++) {
2072 if (*s
== '\\') s
++;
2079 /* XXX broken if the last character is '\\', check that before calling */
2080 static int glob_needed(const char *s
)
2083 if (*s
== '\\') s
++;
2084 if (strchr("*[?",*s
)) return 1;
2090 static void globprint(glob_t
*pglob
)
2093 debug_printf("glob_t at %p:\n", pglob
);
2094 debug_printf(" gl_pathc=%d gl_pathv=%p gl_offs=%d gl_flags=%d\n",
2095 pglob
->gl_pathc
, pglob
->gl_pathv
, pglob
->gl_offs
, pglob
->gl_flags
);
2096 for (i
=0; i
<pglob
->gl_pathc
; i
++)
2097 debug_printf("pglob->gl_pathv[%d] = %p = %s\n", i
,
2098 pglob
->gl_pathv
[i
], pglob
->gl_pathv
[i
]);
2102 static int xglob(o_string
*dest
, int flags
, glob_t
*pglob
)
2106 /* short-circuit for null word */
2107 /* we can code this better when the debug_printf's are gone */
2108 if (dest
->length
== 0) {
2109 if (dest
->nonnull
) {
2110 /* bash man page calls this an "explicit" null */
2111 gr
= globhack(dest
->data
, flags
, pglob
);
2112 debug_printf("globhack returned %d\n",gr
);
2116 } else if (glob_needed(dest
->data
)) {
2117 gr
= glob(dest
->data
, flags
, NULL
, pglob
);
2118 debug_printf("glob returned %d\n",gr
);
2119 if (gr
== GLOB_NOMATCH
) {
2120 /* quote removal, or more accurately, backslash removal */
2121 gr
= globhack(dest
->data
, flags
, pglob
);
2122 debug_printf("globhack returned %d\n",gr
);
2125 gr
= globhack(dest
->data
, flags
, pglob
);
2126 debug_printf("globhack returned %d\n",gr
);
2128 if (gr
== GLOB_NOSPACE
)
2129 error_msg_and_die("out of memory during glob");
2130 if (gr
!= 0) { /* GLOB_ABORTED ? */
2131 error_msg("glob(3) error %d",gr
);
2133 /* globprint(glob_target); */
2138 /* This is used to get/check local shell variables */
2139 static char *get_local_var(const char *s
)
2141 struct variables
*cur
;
2145 for (cur
= top_vars
; cur
; cur
=cur
->next
)
2146 if(strcmp(cur
->name
, s
)==0)
2151 /* This is used to set local shell variables
2152 flg_export==0 if only local (not exporting) variable
2153 flg_export==1 if "new" exporting environ
2154 flg_export>1 if current startup environ (not call putenv()) */
2155 static int set_local_var(const char *s
, int flg_export
)
2159 struct variables
*cur
;
2164 if (getenv(name
) != NULL
) {
2166 "There is a global environmet variable with the same name.\n");
2170 /* Assume when we enter this function that we are already in
2171 * NAME=VALUE format. So the first order of business is to
2172 * split 's' on the '=' into 'name' and 'value' */
2173 value
= strchr(name
, '=');
2174 if (value
==0 && ++value
==0) {
2180 for(cur
= top_vars
; cur
; cur
= cur
->next
) {
2181 if(strcmp(cur
->name
, name
)==0)
2186 if(strcmp(cur
->value
, value
)==0) {
2187 if(flg_export
>0 && cur
->flg_export
==0)
2188 cur
->flg_export
=flg_export
;
2192 if(cur
->flg_read_only
) {
2193 error_msg("%s: readonly variable", name
);
2196 if(flg_export
>0 || cur
->flg_export
>1)
2200 cur
->value
= strdup(value
);
2204 cur
= malloc(sizeof(struct variables
));
2208 cur
->name
= strdup(name
);
2209 if(cur
->name
== 0) {
2213 struct variables
*bottom
= top_vars
;
2214 cur
->value
= strdup(value
);
2216 cur
->flg_export
= flg_export
;
2217 cur
->flg_read_only
= 0;
2218 while(bottom
->next
) bottom
=bottom
->next
;
2225 if(result
==0 && cur
->flg_export
==1) {
2227 result
= putenv(name
);
2232 if(result
>0) /* equivalent to previous set */
2240 static void unset_local_var(const char *name
)
2242 struct variables
*cur
;
2245 for (cur
= top_vars
; cur
; cur
=cur
->next
) {
2246 if(strcmp(cur
->name
, name
)==0)
2250 struct variables
*next
= top_vars
;
2251 if(cur
->flg_read_only
) {
2252 error_msg("%s: readonly variable", name
);
2256 unsetenv(cur
->name
);
2259 while (next
->next
!= cur
)
2261 next
->next
= cur
->next
;
2269 static int is_assignment(const char *s
)
2271 if (s
==NULL
|| !isalpha(*s
)) return 0;
2273 while(isalnum(*s
) || *s
=='_') ++s
;
2278 /* the src parameter allows us to peek forward to a possible &n syntax
2279 * for file descriptor duplication, e.g., "2>&1".
2280 * Return code is 0 normally, 1 if a syntax error is detected in src.
2281 * Resource errors (in xmalloc) cause the process to exit */
2282 static int setup_redirect(struct p_context
*ctx
, int fd
, redir_type style
,
2283 struct in_str
*input
)
2285 struct child_prog
*child
=ctx
->child
;
2286 struct redir_struct
*redir
= child
->redirects
;
2287 struct redir_struct
*last_redir
=NULL
;
2289 /* Create a new redir_struct and drop it onto the end of the linked list */
2294 redir
= xmalloc(sizeof(struct redir_struct
));
2296 redir
->word
.gl_pathv
=NULL
;
2298 last_redir
->next
=redir
;
2300 child
->redirects
=redir
;
2304 redir
->fd
= (fd
==-1) ? redir_table
[style
].default_fd
: fd
;
2306 debug_printf("Redirect type %d%s\n", redir
->fd
, redir_table
[style
].descrip
);
2308 /* Check for a '2>&1' type redirect */
2309 redir
->dup
= redirect_dup_num(input
);
2310 if (redir
->dup
== -2) return 1; /* syntax error */
2311 if (redir
->dup
!= -1) {
2312 /* Erik had a check here that the file descriptor in question
2313 * is legit; I postpone that to "run time"
2314 * A "-" representation of "close me" shows up as a -3 here */
2315 debug_printf("Duplicating redirect '%d>&%d'\n", redir
->fd
, redir
->dup
);
2317 /* We do _not_ try to open the file that src points to,
2318 * since we need to return and let src be expanded first.
2319 * Set ctx->pending_redirect, so we know what to do at the
2320 * end of the next parsed word.
2322 ctx
->pending_redirect
= redir
;
2328 struct pipe
*new_pipe(void) {
2330 pi
= xmalloc(sizeof(struct pipe
));
2334 pi
->followup
= 0; /* invalid */
2338 static void initialize_context(struct p_context
*ctx
)
2342 ctx
->pending_redirect
=NULL
;
2345 ctx
->list_head
=new_pipe();
2346 ctx
->pipe
=ctx
->list_head
;
2352 done_command(ctx
); /* creates the memory for working child */
2355 /* normal return is 0
2356 * if a reserved word is found, and processed, return 1
2357 * should handle if, then, elif, else, fi, for, while, until, do, done.
2358 * case, function, and select are obnoxious, save those for later.
2360 struct reserved_combo
{
2365 /* Mostly a list of accepted follow-up reserved words.
2366 * FLAG_END means we are done with the sequence, and are ready
2367 * to turn the compound list into a command.
2368 * FLAG_START means the word must start a new compound list.
2370 static struct reserved_combo reserved_list
[] = {
2371 { "if", RES_IF
, FLAG_THEN
| FLAG_START
},
2372 { "then", RES_THEN
, FLAG_ELIF
| FLAG_ELSE
| FLAG_FI
},
2373 { "elif", RES_ELIF
, FLAG_THEN
},
2374 { "else", RES_ELSE
, FLAG_FI
},
2375 { "fi", RES_FI
, FLAG_END
},
2376 { "for", RES_FOR
, FLAG_IN
| FLAG_START
},
2377 { "while", RES_WHILE
, FLAG_DO
| FLAG_START
},
2378 { "until", RES_UNTIL
, FLAG_DO
| FLAG_START
},
2379 { "in", RES_IN
, FLAG_DO
},
2380 { "do", RES_DO
, FLAG_DONE
},
2381 { "done", RES_DONE
, FLAG_END
}
2383 #define NRES (sizeof(reserved_list)/sizeof(struct reserved_combo))
2385 int reserved_word(o_string
*dest
, struct p_context
*ctx
)
2387 struct reserved_combo
*r
;
2388 for (r
=reserved_list
;
2389 r
<reserved_list
+NRES
; r
++) {
2390 if (strcmp(dest
->data
, r
->literal
) == 0) {
2391 debug_printf("found reserved word %s, code %d\n",r
->literal
,r
->code
);
2392 if (r
->flag
& FLAG_START
) {
2393 struct p_context
*new = xmalloc(sizeof(struct p_context
));
2394 debug_printf("push stack\n");
2395 if (ctx
->w
== RES_IN
|| ctx
->w
== RES_FOR
) {
2402 *new = *ctx
; /* physical copy */
2403 initialize_context(ctx
);
2405 } else if ( ctx
->w
== RES_NONE
|| ! (ctx
->old_flag
& (1<<r
->code
))) {
2412 ctx
->old_flag
= r
->flag
;
2413 if (ctx
->old_flag
& FLAG_END
) {
2414 struct p_context
*old
;
2415 debug_printf("pop stack\n");
2416 done_pipe(ctx
,PIPE_SEQ
);
2418 old
->child
->group
= ctx
->list_head
;
2420 old
->child
->subshell
= 0;
2422 *ctx
= *old
; /* physical copy */
2432 /* normal return is 0.
2433 * Syntax or xglob errors return 1. */
2434 static int done_word(o_string
*dest
, struct p_context
*ctx
)
2436 struct child_prog
*child
=ctx
->child
;
2438 glob_t
*glob_target
;
2445 debug_printf("done_word: %s %p\n", dest
->data
, child
);
2446 if (dest
->length
== 0 && !dest
->nonnull
) {
2447 debug_printf(" true null, ignored\n");
2451 if (ctx
->pending_redirect
) {
2452 glob_target
= &ctx
->pending_redirect
->word
;
2457 return 1; /* syntax error, groups and arglists don't mix */
2459 if (!child
->argv
&& (ctx
->type
& FLAG_PARSE_SEMICOLON
)) {
2460 debug_printf("checking %s for reserved-ness\n",dest
->data
);
2461 if (reserved_word(dest
,ctx
)) return ctx
->w
==RES_SNTX
;
2464 glob_target
= &child
->glob_result
;
2465 if (child
->argv
) flags
|= GLOB_APPEND
;
2467 for (cnt
= 1, s
= dest
->data
; s
&& *s
; s
++) {
2468 if (*s
== '\\') s
++;
2473 if ( child
->argv
== NULL
) {
2476 argc
= ++child
->argc
;
2477 child
->argv
= realloc(child
->argv
, (argc
+1)*sizeof(*child
->argv
));
2478 if (child
->argv
== NULL
) return 1;
2479 child
->argv
[argc
-1]=str
;
2480 child
->argv
[argc
]=NULL
;
2481 for (s
= dest
->data
; s
&& *s
; s
++,str
++) {
2482 if (*s
== '\\') s
++;
2489 gr
= xglob(dest
, flags
, glob_target
);
2490 if (gr
!= 0) return 1;
2495 if (ctx
->pending_redirect
) {
2496 ctx
->pending_redirect
=NULL
;
2497 if (glob_target
->gl_pathc
!= 1) {
2498 error_msg("ambiguous redirect");
2502 child
->argv
= glob_target
->gl_pathv
;
2505 if (ctx
->w
== RES_FOR
) {
2506 done_word(dest
,ctx
);
2507 done_pipe(ctx
,PIPE_SEQ
);
2512 /* The only possible error here is out of memory, in which case
2514 static int done_command(struct p_context
*ctx
)
2516 /* The child is really already in the pipe structure, so
2517 * advance the pipe counter and make a new, null child.
2518 * Only real trickiness here is that the uncommitted
2519 * child structure, to which ctx->child points, is not
2520 * counted in pi->num_progs. */
2521 struct pipe
*pi
=ctx
->pipe
;
2522 struct child_prog
*prog
=ctx
->child
;
2524 if (prog
&& prog
->group
== NULL
2525 && prog
->argv
== NULL
2527 && prog
->redirects
== NULL
) {
2531 debug_printf("done_command: skipping null command\n");
2535 debug_printf("done_command: num_progs incremented to %d\n",pi
->num_progs
);
2537 debug_printf("done_command: initializing\n");
2539 pi
->progs
= xrealloc(pi
->progs
, sizeof(*pi
->progs
) * (pi
->num_progs
+1));
2541 prog
= pi
->progs
+ pi
->num_progs
;
2543 prog
->redirects
= NULL
;
2547 prog
->is_stopped
= 0;
2551 prog
->glob_result
.gl_pathv
= NULL
;
2556 prog
->type
= ctx
->type
;
2558 /* but ctx->pipe and ctx->list_head remain unchanged */
2562 static int done_pipe(struct p_context
*ctx
, pipe_style type
)
2565 done_command(ctx
); /* implicit closure of previous command */
2566 debug_printf("done_pipe, type %d\n", type
);
2567 ctx
->pipe
->followup
= type
;
2568 ctx
->pipe
->r_mode
= ctx
->w
;
2570 ctx
->pipe
->next
= new_p
;
2573 done_command(ctx
); /* set up new pipe to accept commands */
2578 /* peek ahead in the in_str to find out if we have a "&n" construct,
2579 * as in "2>&1", that represents duplicating a file descriptor.
2580 * returns either -2 (syntax error), -1 (no &), or the number found.
2582 static int redirect_dup_num(struct in_str
*input
)
2586 if (ch
!= '&') return -1;
2588 b_getch(input
); /* get the & */
2592 return -3; /* "-" represents "close me" */
2594 while (isdigit(ch
)) {
2602 error_msg("ambiguous redirect");
2606 /* If a redirect is immediately preceded by a number, that number is
2607 * supposed to tell which file descriptor to redirect. This routine
2608 * looks for such preceding numbers. In an ideal world this routine
2609 * needs to handle all the following classes of redirects...
2610 * echo 2>foo # redirects fd 2 to file "foo", nothing passed to echo
2611 * echo 49>foo # redirects fd 49 to file "foo", nothing passed to echo
2612 * echo -2>foo # redirects fd 1 to file "foo", "-2" passed to echo
2613 * echo 49x>foo # redirects fd 1 to file "foo", "49x" passed to echo
2614 * A -1 output from this program means no valid number was found, so the
2615 * caller should use the appropriate default for this redirection.
2617 static int redirect_opt_num(o_string
*o
)
2621 if (o
->length
==0) return -1;
2622 for(num
=0; num
<o
->length
; num
++) {
2623 if (!isdigit(*(o
->data
+num
))) {
2627 /* reuse num (and save an int) */
2633 FILE *generate_stream_from_list(struct pipe
*head
)
2637 int pid
, channel
[2];
2638 if (pipe(channel
)<0) perror_msg_and_die("pipe");
2641 perror_msg_and_die("fork");
2642 } else if (pid
==0) {
2644 if (channel
[1] != 1) {
2649 #define SURROGATE "surrogate response"
2650 write(1,SURROGATE
,sizeof(SURROGATE
));
2651 _exit(run_list(head
));
2653 _exit(run_list_real(head
)); /* leaks memory */
2656 debug_printf("forked child %d\n",pid
);
2658 pf
= fdopen(channel
[0],"r");
2659 debug_printf("pipe on FILE *%p\n",pf
);
2661 free_pipe_list(head
,0);
2662 pf
=popen("echo surrogate response","r");
2663 debug_printf("started fake pipe on FILE *%p\n",pf
);
2668 /* this version hacked for testing purposes */
2669 /* return code is exit status of the process that is run. */
2670 static int process_command_subs(o_string
*dest
, struct p_context
*ctx
, struct in_str
*input
, int subst_end
)
2673 o_string result
=NULL_O_STRING
;
2674 struct p_context inner
;
2676 struct in_str pipe_str
;
2677 initialize_context(&inner
);
2679 /* recursion to generate command */
2680 retcode
= parse_stream(&result
, &inner
, input
, subst_end
);
2681 if (retcode
!= 0) return retcode
; /* syntax error or EOF */
2682 done_word(&result
, &inner
);
2683 done_pipe(&inner
, PIPE_SEQ
);
2686 p
=generate_stream_from_list(inner
.list_head
);
2687 if (p
==NULL
) return 1;
2688 mark_open(fileno(p
));
2689 setup_file_in_str(&pipe_str
, p
);
2691 /* now send results of command back into original context */
2692 retcode
= parse_stream(dest
, ctx
, &pipe_str
, '\0');
2693 /* XXX In case of a syntax error, should we try to kill the child?
2694 * That would be tough to do right, so just read until EOF. */
2696 while (b_getch(&pipe_str
)!=EOF
) { /* discard */ };
2699 debug_printf("done reading from pipe, pclose()ing\n");
2700 /* This is the step that wait()s for the child. Should be pretty
2701 * safe, since we just read an EOF from its stdout. We could try
2702 * to better, by using wait(), and keeping track of background jobs
2703 * at the same time. That would be a lot of work, and contrary
2704 * to the KISS philosophy of this program. */
2705 mark_closed(fileno(p
));
2707 free_pipe_list(inner
.list_head
,0);
2708 debug_printf("pclosed, retcode=%d\n",retcode
);
2709 /* XXX this process fails to trim a single trailing newline */
2713 static int parse_group(o_string
*dest
, struct p_context
*ctx
,
2714 struct in_str
*input
, int ch
)
2717 struct p_context sub
;
2718 struct child_prog
*child
= ctx
->child
;
2721 return 1; /* syntax error, groups and arglists don't mix */
2723 initialize_context(&sub
);
2725 case '(': endch
=')'; child
->subshell
=1; break;
2726 case '{': endch
='}'; break;
2727 default: syntax(); /* really logic error */
2729 rcode
=parse_stream(dest
,&sub
,input
,endch
);
2730 done_word(dest
,&sub
); /* finish off the final word in the subcontext */
2731 done_pipe(&sub
, PIPE_SEQ
); /* and the final command there, too */
2732 child
->group
= sub
.list_head
;
2734 /* child remains "open", available for possible redirects */
2738 /* basically useful version until someone wants to get fancier,
2739 * see the bash man page under "Parameter Expansion" */
2740 static char *lookup_param(char *src
)
2746 p
= get_local_var(src
);
2751 /* return code: 0 for OK, 1 for syntax error */
2752 static int handle_dollar(o_string
*dest
, struct p_context
*ctx
, struct in_str
*input
)
2762 int ch
= input
->peek(input
); /* first character after the $ */
2763 debug_printf("handle_dollar: ch=%c\n",ch
);
2765 b_addchr(dest
, SPECIAL_VAR_SYMBOL
);
2767 while(ch
=b_peek(input
),isalnum(ch
) || ch
=='_') {
2771 b_addchr(dest
, SPECIAL_VAR_SYMBOL
);
2773 } else if (isdigit(ch
)) {
2774 i
= ch
-'0'; /* XXX is $0 special? */
2775 if (i
<global_argc
) {
2776 parse_string(dest
, ctx
, global_argv
[i
]); /* recursion */
2780 } else switch (ch
) {
2783 b_adduint(dest
,getpid());
2787 if (last_bg_pid
> 0) b_adduint(dest
, last_bg_pid
);
2792 b_adduint(dest
,last_return_code
);
2797 b_adduint(dest
,global_argc
? global_argc
-1 : 0);
2802 b_addchr(dest
, SPECIAL_VAR_SYMBOL
);
2805 /* XXX maybe someone will try to escape the '}' */
2806 while(ch
=b_getch(input
),ch
!=EOF
&& ch
!='}') {
2813 b_addchr(dest
, SPECIAL_VAR_SYMBOL
);
2818 process_command_subs(dest
, ctx
, input
, ')');
2822 for (i
=1; i
<global_argc
; i
++) {
2823 parse_string(dest
, ctx
, global_argv
[i
]);
2824 if (i
+1 < global_argc
) parse_string(dest
, ctx
, sep
);
2830 /* still unhandled, but should be eventually */
2831 error_msg("unhandled syntax: $%c",ch
);
2836 b_addqchr(dest
,'$',dest
->quote
);
2838 /* Eat the character if the flag was set. If the compiler
2839 * is smart enough, we could substitute "b_getch(input);"
2840 * for all the "advance = 1;" above, and also end up with
2841 * a nice size-optimized program. Hah! That'll be the day.
2843 if (advance
) b_getch(input
);
2848 int parse_string(o_string
*dest
, struct p_context
*ctx
, const char *src
)
2851 setup_string_in_str(&foo
, src
);
2852 return parse_stream(dest
, ctx
, &foo
, '\0');
2856 /* return code is 0 for normal exit, 1 for syntax error */
2857 int parse_stream(o_string
*dest
, struct p_context
*ctx
,
2858 struct in_str
*input
, int end_trigger
)
2863 redir_type redir_style
;
2867 /* Only double-quote state is handled in the state variable dest->quote.
2868 * A single-quote triggers a bypass of the main loop until its mate is
2869 * found. When recursing, quote state is passed in via dest->quote. */
2871 debug_printf("parse_stream, end_trigger=%d\n",end_trigger
);
2872 while ((ch
=b_getch(input
))!=EOF
) {
2875 if (input
->__promptme
== 0) return 1;
2877 next
= (ch
== '\n') ? 0 : b_peek(input
);
2878 debug_printf("parse_stream: ch=%c (%d) m=%d quote=%d\n",
2879 ch
,ch
,m
,dest
->quote
);
2880 if (m
==0 || ((m
==1 || m
==2) && dest
->quote
)) {
2881 b_addqchr(dest
, ch
, dest
->quote
);
2883 if (m
==2) { /* unquoted IFS */
2884 if (done_word(dest
, ctx
)) {
2887 /* If we aren't performing a substitution, treat a newline as a
2888 * command separator. */
2889 if (end_trigger
!= '\0' && ch
=='\n')
2890 done_pipe(ctx
,PIPE_SEQ
);
2892 if (ch
== end_trigger
&& !dest
->quote
&& ctx
->w
==RES_NONE
) {
2893 debug_printf("leaving parse_stream (triggered)\n");
2898 /* Yahoo! Time to run with it! */
2899 done_pipe(ctx
,PIPE_SEQ
);
2900 run_list(ctx
->list_head
);
2901 initialize_context(ctx
);
2904 if (m
!=2) switch (ch
) {
2906 if (dest
->length
== 0 && !dest
->quote
) {
2907 while(ch
=b_peek(input
),ch
!=EOF
&& ch
!='\n') { b_getch(input
); }
2909 b_addqchr(dest
, ch
, dest
->quote
);
2917 b_addqchr(dest
, '\\', dest
->quote
);
2918 b_addqchr(dest
, b_getch(input
), dest
->quote
);
2921 if (handle_dollar(dest
, ctx
, input
)!=0) return 1;
2925 while(ch
=b_getch(input
),ch
!=EOF
&& ch
!='\'') {
2927 if(input
->__promptme
== 0) return 1;
2938 dest
->quote
= !dest
->quote
;
2942 process_command_subs(dest
, ctx
, input
, '`');
2945 redir_fd
= redirect_opt_num(dest
);
2946 done_word(dest
, ctx
);
2947 redir_style
=REDIRECT_OVERWRITE
;
2949 redir_style
=REDIRECT_APPEND
;
2951 } else if (next
== '(') {
2952 syntax(); /* until we support >(list) Process Substitution */
2955 setup_redirect(ctx
, redir_fd
, redir_style
, input
);
2958 redir_fd
= redirect_opt_num(dest
);
2959 done_word(dest
, ctx
);
2960 redir_style
=REDIRECT_INPUT
;
2962 redir_style
=REDIRECT_HEREIS
;
2964 } else if (next
== '>') {
2965 redir_style
=REDIRECT_IO
;
2967 } else if (next
== '(') {
2968 syntax(); /* until we support <(list) Process Substitution */
2971 setup_redirect(ctx
, redir_fd
, redir_style
, input
);
2975 done_word(dest
, ctx
);
2976 done_pipe(ctx
,PIPE_SEQ
);
2979 done_word(dest
, ctx
);
2982 done_pipe(ctx
,PIPE_AND
);
2985 done_pipe(ctx
,PIPE_BG
);
2993 done_word(dest
, ctx
);
2996 done_pipe(ctx
,PIPE_OR
);
2998 /* we could pick up a file descriptor choice here
2999 * with redirect_opt_num(), but bash doesn't do it.
3000 * "echo foo 2| cat" yields "foo 2". */
3012 if (parse_group(dest
, ctx
, input
, ch
)!=0) return 1;
3016 syntax(); /* Proper use of this character caught by end_trigger */
3021 syntax(); /* this is really an internal logic error */
3026 /* complain if quote? No, maybe we just finished a command substitution
3027 * that was quoted. Example:
3028 * $ echo "`cat foo` plus more"
3029 * and we just got the EOF generated by the subshell that ran "cat foo"
3030 * The only real complaint is if we got an EOF when end_trigger != '\0',
3031 * that is, we were really supposed to get end_trigger, and never got
3032 * one before the EOF. Can't use the standard "syntax error" return code,
3033 * so that parse_stream_outer can distinguish the EOF and exit smoothly. */
3034 debug_printf("leaving parse_stream (EOF)\n");
3035 if (end_trigger
!= '\0') return -1;
3039 void mapset(const unsigned char *set
, int code
)
3041 const unsigned char *s
;
3042 for (s
=set
; *s
; s
++) map
[*s
] = code
;
3045 void update_ifs_map(void)
3047 /* char *ifs and char map[256] are both globals. */
3048 ifs
= getenv("IFS");
3049 if (ifs
== NULL
) ifs
=" \t\n";
3050 /* Precompute a list of 'flow through' behavior so it can be treated
3051 * quickly up front. Computation is necessary because of IFS.
3052 * Special case handling of IFS == " \t\n" is not implemented.
3053 * The map[] array only really needs two bits each, and on most machines
3054 * that would be faster because of the reduced L1 cache footprint.
3056 memset(map
,0,sizeof(map
)); /* most characters flow through always */
3058 mapset("\\$'\"`", 3); /* never flow through */
3059 mapset("<>;&|(){}#", 1); /* flow through if quoted */
3061 mapset("\\$'\"", 3); /* never flow through */
3062 mapset(";&|#", 1); /* flow through if quoted */
3064 mapset(ifs
, 2); /* also flow through if quoted */
3067 /* most recursion does not come through here, the exeception is
3068 * from builtin_source() */
3069 int parse_stream_outer(struct in_str
*inp
, int flag
)
3072 struct p_context ctx
;
3073 o_string temp
=NULL_O_STRING
;
3080 initialize_context(&ctx
);
3082 if (!(flag
& FLAG_PARSE_SEMICOLON
) || (flag
& FLAG_REPARSING
)) mapset(";$&|", 0);
3084 rcode
= parse_stream(&temp
, &ctx
, inp
, '\n');
3086 if (rcode
== 1) flag_repeat
= 0;
3088 if (rcode
!= 1 && ctx
.old_flag
!= 0) {
3094 if (rcode
!= 1 && ctx
.old_flag
== 0) {
3095 done_word(&temp
, &ctx
);
3096 done_pipe(&ctx
,PIPE_SEQ
);
3098 run_list(ctx
.list_head
);
3100 if (((code
= run_list(ctx
.list_head
)) == -1))
3104 if (ctx
.old_flag
!= 0) {
3109 if (inp
->__promptme
== 0) printf("<INTERRUPT>\n");
3110 inp
->__promptme
= 1;
3115 free_pipe_list(ctx
.list_head
,0);
3118 } while (rcode
!= -1 && !(flag
& FLAG_EXIT_FROM_LOOP
)); /* loop on syntax errors, return on EOF */
3122 return (code
!= 0) ? 1 : 0;
3123 #endif /* __U_BOOT__ */
3127 static int parse_string_outer(const char *s
, int flag
)
3129 int parse_string_outer(char *s
, int flag
)
3130 #endif /* __U_BOOT__ */
3132 struct in_str input
;
3138 if (!(p
= strchr(s
, '\n')) || *++p
) {
3139 p
= xmalloc(strlen(s
) + 2);
3142 setup_string_in_str(&input
, p
);
3143 rcode
= parse_stream_outer(&input
, flag
);
3148 setup_string_in_str(&input
, s
);
3149 return parse_stream_outer(&input
, flag
);
3156 static int parse_file_outer(FILE *f
)
3158 int parse_file_outer(void)
3162 struct in_str input
;
3164 setup_file_in_str(&input
, f
);
3166 setup_file_in_str(&input
);
3168 rcode
= parse_stream_outer(&input
, FLAG_PARSE_SEMICOLON
);
3173 static void u_boot_hush_reloc(void)
3175 DECLARE_GLOBAL_DATA_PTR
;
3177 struct reserved_combo
*r
;
3179 for (r
=reserved_list
; r
<reserved_list
+NRES
; r
++) {
3180 addr
= (ulong
) (r
->literal
) + gd
->reloc_off
;
3181 r
->literal
= (char *)addr
;
3185 int u_boot_hush_start(void)
3187 top_vars
= malloc(sizeof(struct variables
));
3188 top_vars
->name
= "HUSH_VERSION";
3189 top_vars
->value
= "0.01";
3191 top_vars
->flg_export
= 0;
3192 top_vars
->flg_read_only
= 1;
3193 u_boot_hush_reloc();
3197 static void *xmalloc(size_t size
)
3201 if (!(p
= malloc(size
))) {
3202 printf("ERROR : memory not allocated\n");
3208 static void *xrealloc(void *ptr
, size_t size
)
3212 if (!(p
= realloc(ptr
, size
))) {
3213 printf("ERROR : memory not allocated\n");
3218 #endif /* __U_BOOT__ */
3221 /* Make sure we have a controlling tty. If we get started under a job
3222 * aware app (like bash for example), make sure we are now in charge so
3223 * we don't fight over who gets the foreground */
3224 static void setup_job_control(void)
3226 static pid_t shell_pgrp
;
3227 /* Loop until we are in the foreground. */
3228 while (tcgetpgrp (shell_terminal
) != (shell_pgrp
= getpgrp ()))
3229 kill (- shell_pgrp
, SIGTTIN
);
3231 /* Ignore interactive and job-control signals. */
3232 signal(SIGINT
, SIG_IGN
);
3233 signal(SIGQUIT
, SIG_IGN
);
3234 signal(SIGTERM
, SIG_IGN
);
3235 signal(SIGTSTP
, SIG_IGN
);
3236 signal(SIGTTIN
, SIG_IGN
);
3237 signal(SIGTTOU
, SIG_IGN
);
3238 signal(SIGCHLD
, SIG_IGN
);
3240 /* Put ourselves in our own process group. */
3242 shell_pgrp
= getpid ();
3243 setpgid (shell_pgrp
, shell_pgrp
);
3245 /* Grab control of the terminal. */
3246 tcsetpgrp(shell_terminal
, shell_pgrp
);
3249 int hush_main(int argc
, char **argv
)
3255 /* XXX what should these be while sourcing /etc/profile? */
3259 /* (re?) initialize globals. Sometimes hush_main() ends up calling
3260 * hush_main(), therefore we cannot rely on the BSS to zero out this
3261 * stuff. Reset these to 0 every time. */
3263 /* map[] is taken care of with call to update_ifs_map() */
3266 close_me_head
= NULL
;
3271 /* Initialize some more globals to non-zero values */
3273 #ifdef CONFIG_FEATURE_COMMAND_EDITING
3274 cmdedit_set_initial_prompt();
3280 /* initialize our shell local variables with the values
3281 * currently living in the environment */
3284 set_local_var(*e
, 2); /* without call putenv() */
3287 last_return_code
=EXIT_SUCCESS
;
3290 if (argv
[0] && argv
[0][0] == '-') {
3291 debug_printf("\nsourcing /etc/profile\n");
3292 if ((input
= fopen("/etc/profile", "r")) != NULL
) {
3293 mark_open(fileno(input
));
3294 parse_file_outer(input
);
3295 mark_closed(fileno(input
));
3301 while ((opt
= getopt(argc
, argv
, "c:xif")) > 0) {
3305 global_argv
= argv
+optind
;
3306 global_argc
= argc
-optind
;
3307 opt
= parse_string_outer(optarg
, FLAG_PARSE_SEMICOLON
);
3319 fprintf(stderr
, "Usage: sh [FILE]...\n"
3320 " or: sh -c command [args]...\n\n");
3327 /* A shell is interactive if the `-i' flag was given, or if all of
3328 * the following conditions are met:
3330 * no arguments remaining or the -s flag given
3331 * standard input is a terminal
3332 * standard output is a terminal
3333 * Refer to Posix.2, the description of the `sh' utility. */
3334 if (argv
[optind
]==NULL
&& input
==stdin
&&
3335 isatty(fileno(stdin
)) && isatty(fileno(stdout
))) {
3339 debug_printf("\ninteractive=%d\n", interactive
);
3341 /* Looks like they want an interactive shell */
3342 #ifndef CONFIG_FEATURE_SH_EXTRA_QUIET
3343 printf( "\n\n" BB_BANNER
" hush - the humble shell v0.01 (testing)\n");
3344 printf( "Enter 'help' for a list of built-in commands.\n\n");
3346 setup_job_control();
3349 if (argv
[optind
]==NULL
) {
3350 opt
=parse_file_outer(stdin
);
3354 debug_printf("\nrunning script '%s'\n", argv
[optind
]);
3355 global_argv
= argv
+optind
;
3356 global_argc
= argc
-optind
;
3357 input
= xfopen(argv
[optind
], "r");
3358 opt
= parse_file_outer(input
);
3360 #ifdef CONFIG_FEATURE_CLEAN_UP
3362 if (cwd
&& cwd
!= unknown
)
3365 struct variables
*cur
, *tmp
;
3366 for(cur
= top_vars
; cur
; cur
= tmp
) {
3368 if (!cur
->flg_read_only
) {
3378 return(opt
?opt
:last_return_code
);
3382 static char *insert_var_value(char *inp
)
3384 int res_str_len
= 0;
3387 char *p
, *p1
, *res_str
= NULL
;
3389 while ((p
= strchr(inp
, SPECIAL_VAR_SYMBOL
))) {
3392 res_str
= xrealloc(res_str
, (res_str_len
+ len
));
3393 strncpy((res_str
+ res_str_len
), inp
, len
);
3397 p
= strchr(inp
, SPECIAL_VAR_SYMBOL
);
3399 if ((p1
= lookup_param(inp
))) {
3400 len
= res_str_len
+ strlen(p1
);
3401 res_str
= xrealloc(res_str
, (1 + len
));
3402 strcpy((res_str
+ res_str_len
), p1
);
3405 *p
= SPECIAL_VAR_SYMBOL
;
3410 res_str
= xrealloc(res_str
, (1 + res_str_len
+ strlen(inp
)));
3411 strcpy((res_str
+ res_str_len
), inp
);
3412 while ((p
= strchr(res_str
, '\n'))) {
3416 return (res_str
== NULL
) ? inp
: res_str
;
3419 static char **make_list_in(char **inp
, char *name
)
3422 int name_len
= strlen(name
);
3427 /* create list of variable values */
3428 list
= xmalloc(sizeof(*list
));
3429 for (i
= 0; inp
[i
]; i
++) {
3430 p3
= insert_var_value(inp
[i
]);
3437 if ((p2
= strchr(p1
, ' '))) {
3443 /* we use n + 2 in realloc for list,because we add
3444 * new element and then we will add NULL element */
3445 list
= xrealloc(list
, sizeof(*list
) * (n
+ 2));
3446 list
[n
] = xmalloc(2 + name_len
+ len
);
3447 strcpy(list
[n
], name
);
3448 strcat(list
[n
], "=");
3449 strncat(list
[n
], p1
, len
);
3450 list
[n
++][name_len
+ len
+ 1] = '\0';
3453 if (p3
!= inp
[i
]) free(p3
);
3459 /* Make new string for parser */
3460 static char * make_string(char ** inp
)
3467 for (n
= 0; inp
[n
]; n
++) {
3468 p
= insert_var_value(inp
[n
]);
3469 str
= xrealloc(str
, (len
+ strlen(p
)));
3476 len
= strlen(str
) + 3;
3477 if (p
!= inp
[n
]) free(p
);
3480 *(str
+ len
) = '\n';
3481 *(str
+ len
+ 1) = '\0';
3485 #endif /* CFG_HUSH_PARSER */
3486 /****************************************************************************/