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.
7 * Copyright (C) 2000,2001 Larry Doolittle <larry@doolittle.boa.org>
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.
20 * simple_itoa() was lifted from boa-0.93.15
21 * b_addchr() derived from similar w_addchar function in glibc-2.2
22 * setup_redirect(), redirect_opt_num(), and big chunks of main()
23 * and many builtins derived from contributions by Erik Andersen
24 * miscellaneous bugfixes from Matt Kraai
26 * There are two big (and related) architecture differences between
27 * this parser and the lash parser. One is that this version is
28 * actually designed from the ground up to understand nearly all
29 * of the Bourne grammar. The second, consequential change is that
30 * the parser and input reader have been turned inside out. Now,
31 * the parser is in control, and asks for input as needed. The old
32 * way had the input reader in control, and it asked for parsing to
33 * take place as needed. The new way makes it much easier to properly
34 * handle the recursion implicit in the various substitutions, especially
35 * across continuation lines.
37 * Bash grammar not implemented: (how many of these were in original sh?)
38 * $@ (those sure look like weird quoting rules)
40 * ! negation operator for pipes
41 * &> and >& redirection of stdout+stderr
44 * fancy forms of Parameter Expansion
46 * Arithmetic Expansion
47 * <(list) and >(list) Process Substitution
48 * reserved words: case, esac, select, function
49 * Here Documents ( << word )
52 * job handling woefully incomplete and buggy
53 * reserved word execution woefully incomplete and buggy
55 * port selected bugfixes from post-0.49 busybox lash - done?
56 * finish implementing reserved words: for, while, until, do, done
57 * change { and } from special chars to reserved words
58 * builtins: break, continue, eval, return, set, trap, ulimit
60 * handle children going into background
61 * clean up recognition of null pipes
62 * check setting of global_argc and global_argv
63 * control-C handling, probably with longjmp
64 * follow IFS rules more precisely, including update semantics
65 * figure out what to do with backslash-newline
66 * explain why we use signal instead of sigaction
67 * propagate syntax errors, die on resource errors?
68 * continuation lines, both explicit and implicit - done?
69 * memory leak finding and plugging - done?
70 * more testing, especially quoting rules and redirection
71 * document how quoting rules not precisely followed for variable assignments
72 * maybe change map[] to use 2-bit entries
73 * (eventually) remove all the printf's
75 * This program is free software; you can redistribute it and/or modify
76 * it under the terms of the GNU General Public License as published by
77 * the Free Software Foundation; either version 2 of the License, or
78 * (at your option) any later version.
80 * This program is distributed in the hope that it will be useful,
81 * but WITHOUT ANY WARRANTY; without even the implied warranty of
82 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
83 * General Public License for more details.
85 * You should have received a copy of the GNU General Public License
86 * along with this program; if not, write to the Free Software
87 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
91 #include <malloc.h> /* malloc, free, realloc*/
92 #include <linux/ctype.h> /* isalpha, isdigit */
93 #include <common.h> /* readline */
95 #include <command.h> /* find_cmd */
98 #include <ctype.h> /* isalpha, isdigit */
99 #include <unistd.h> /* getpid */
100 #include <stdlib.h> /* getenv, atoi */
101 #include <string.h> /* strchr */
102 #include <stdio.h> /* popen etc. */
103 #include <glob.h> /* glob, of course */
104 #include <stdarg.h> /* va_list */
107 #include <getopt.h> /* should be pretty obvious */
109 #include <sys/stat.h> /* ulimit */
110 #include <sys/types.h>
111 #include <sys/wait.h>
114 /* #include <dmalloc.h> */
120 #define applet_name "hush"
121 #include "standalone.h"
122 #define hush_main main
123 #undef CONFIG_FEATURE_SH_FANCY_PROMPT
127 #define SPECIAL_VAR_SYMBOL 03
129 #define FLAG_EXIT_FROM_LOOP 1
130 #define FLAG_PARSE_SEMICOLON (1 << 1) /* symbol ';' is special for parser */
131 #define FLAG_REPARSING (1 << 2) /* >= 2nd pass */
136 DECLARE_GLOBAL_DATA_PTR;
138 #define EXIT_SUCCESS 0
140 #define syntax() syntax_err()
141 #define xstrdup strdup
142 #define error_msg printf
146 REDIRECT_OVERWRITE = 2,
152 /* The descrip member of this structure is only used to make debugging
154 struct {int mode; int default_fd; char *descrip;} redir_table[] = {
156 { O_RDONLY, 0, "<" },
157 { O_CREAT|O_TRUNC|O_WRONLY, 1, ">" },
158 { O_CREAT|O_APPEND|O_WRONLY, 1, ">>" },
159 { O_RDONLY, -1, "<<" },
171 /* might eventually control execution */
188 #define FLAG_END (1<<RES_NONE)
189 #define FLAG_IF (1<<RES_IF)
190 #define FLAG_THEN (1<<RES_THEN)
191 #define FLAG_ELIF (1<<RES_ELIF)
192 #define FLAG_ELSE (1<<RES_ELSE)
193 #define FLAG_FI (1<<RES_FI)
194 #define FLAG_FOR (1<<RES_FOR)
195 #define FLAG_WHILE (1<<RES_WHILE)
196 #define FLAG_UNTIL (1<<RES_UNTIL)
197 #define FLAG_DO (1<<RES_DO)
198 #define FLAG_DONE (1<<RES_DONE)
199 #define FLAG_IN (1<<RES_IN)
200 #define FLAG_START (1<<RES_XXXX)
202 /* This holds pointers to the various results of parsing */
204 struct child_prog *child;
205 struct pipe *list_head;
208 struct redir_struct *pending_redirect;
211 int old_flag; /* for figuring out valid reserved words */
212 struct p_context *stack;
213 int type; /* define type of parser : ";$" common or special symbol */
214 /* How about quoting status? */
218 struct redir_struct {
219 redir_type type; /* type of redirection */
220 int fd; /* file descriptor being redirected */
221 int dup; /* -1, or file descriptor being duplicated */
222 struct redir_struct *next; /* pointer to the next redirect in the list */
223 glob_t word; /* *word.gl_pathv is the filename */
229 pid_t pid; /* 0 if exited */
231 char **argv; /* program name and arguments */
233 int argc; /* number of program arguments */
235 struct pipe *group; /* if non-NULL, first in group or subshell */
237 int subshell; /* flag, non-zero if group must be forked */
238 struct redir_struct *redirects; /* I/O redirections */
239 glob_t glob_result; /* result of parameter globbing */
240 int is_stopped; /* is the program currently running? */
241 struct pipe *family; /* pointer back to the child's parent pipe */
243 int sp; /* number of SPECIAL_VAR_SYMBOL */
249 int jobid; /* job number */
251 int num_progs; /* total number of programs in job */
253 int running_progs; /* number of programs running */
254 char *text; /* name of job */
255 char *cmdbuf; /* buffer various argv's point into */
256 pid_t pgrp; /* process group ID for the job */
258 struct child_prog *progs; /* array of commands in pipe */
259 struct pipe *next; /* to track background commands */
261 int stopped_progs; /* number of programs alive, but stopped */
262 int job_context; /* bitmask defining current context */
264 pipe_style followup; /* PIPE_BG, PIPE_SEQ, PIPE_OR, PIPE_AND */
265 reserved_style r_mode; /* supports if, for, while, until */
271 struct close_me *next;
280 struct variables *next;
283 /* globals, connect us to the outside world
284 * the first three support $?, $#, and $1 */
287 unsigned int global_argc;
289 unsigned int last_return_code;
292 extern char **environ; /* This is in <unistd.h>, but protected with __USE_GNU */
295 /* "globals" within this file */
297 static char map[256];
299 static int fake_mode;
300 static int interactive;
301 static struct close_me *close_me_head;
302 static const char *cwd;
303 static struct pipe *job_list;
304 static unsigned int last_bg_pid;
305 static unsigned int last_jobid;
306 static unsigned int shell_terminal;
309 struct variables shell_ver = { "HUSH_VERSION", "0.01", 1, 1, 0 };
310 struct variables *top_vars = &shell_ver;
312 static int flag_repeat = 0;
313 static int do_repeat = 0;
314 static struct variables *top_vars = NULL ;
315 #endif /*__U_BOOT__ */
317 #define B_CHUNK (100)
327 #define NULL_O_STRING {NULL,0,0,0,0}
328 /* used for initialization:
329 o_string foo = NULL_O_STRING; */
331 /* I can almost use ordinary FILE *. Is open_memstream() universally
332 * available? Where is it documented? */
343 int (*get) (struct in_str *);
344 int (*peek) (struct in_str *);
346 #define b_getch(input) ((input)->get(input))
347 #define b_peek(input) ((input)->peek(input))
350 #define JOB_STATUS_FORMAT "[%d] %-22s %.40s\n"
352 struct built_in_command {
353 char *cmd; /* name */
354 char *descr; /* description */
355 int (*function) (struct child_prog *); /* function ptr */
359 /* define DEBUG_SHELL for debugging output (obviously ;-)) */
364 /* This should be in utility.c */
367 static void debug_printf(const char *format, ...)
370 va_start(args, format);
371 vfprintf(stderr, format, args);
375 #define debug_printf(fmt,args...) printf (fmt ,##args)
378 static inline void debug_printf(const char *format, ...) { }
380 #define final_printf debug_printf
383 static void syntax_err(void) {
384 printf("syntax error\n");
387 static void __syntax(char *file, int line) {
388 error_msg("syntax error %s:%d", file, line);
390 #define syntax() __syntax(__FILE__, __LINE__)
394 static void *xmalloc(size_t size);
395 static void *xrealloc(void *ptr, size_t size);
397 /* Index of subroutines: */
398 /* function prototypes for builtins */
399 static int builtin_cd(struct child_prog *child);
400 static int builtin_env(struct child_prog *child);
401 static int builtin_eval(struct child_prog *child);
402 static int builtin_exec(struct child_prog *child);
403 static int builtin_exit(struct child_prog *child);
404 static int builtin_export(struct child_prog *child);
405 static int builtin_fg_bg(struct child_prog *child);
406 static int builtin_help(struct child_prog *child);
407 static int builtin_jobs(struct child_prog *child);
408 static int builtin_pwd(struct child_prog *child);
409 static int builtin_read(struct child_prog *child);
410 static int builtin_set(struct child_prog *child);
411 static int builtin_shift(struct child_prog *child);
412 static int builtin_source(struct child_prog *child);
413 static int builtin_umask(struct child_prog *child);
414 static int builtin_unset(struct child_prog *child);
415 static int builtin_not_written(struct child_prog *child);
417 /* o_string manipulation: */
418 static int b_check_space(o_string *o, int len);
419 static int b_addchr(o_string *o, int ch);
420 static void b_reset(o_string *o);
421 static int b_addqchr(o_string *o, int ch, int quote);
423 static int b_adduint(o_string *o, unsigned int i);
425 /* in_str manipulations: */
426 static int static_get(struct in_str *i);
427 static int static_peek(struct in_str *i);
428 static int file_get(struct in_str *i);
429 static int file_peek(struct in_str *i);
431 static void setup_file_in_str(struct in_str *i, FILE *f);
433 static void setup_file_in_str(struct in_str *i);
435 static void setup_string_in_str(struct in_str *i, const char *s);
437 /* close_me manipulations: */
438 static void mark_open(int fd);
439 static void mark_closed(int fd);
440 static void close_all(void);
442 /* "run" the final data structures: */
443 static char *indenter(int i);
444 static int free_pipe_list(struct pipe *head, int indent);
445 static int free_pipe(struct pipe *pi, int indent);
446 /* really run the final data structures: */
448 static int setup_redirects(struct child_prog *prog, int squirrel[]);
450 static int run_list_real(struct pipe *pi);
452 static void pseudo_exec(struct child_prog *child) __attribute__ ((noreturn));
454 static int run_pipe_real(struct pipe *pi);
455 /* extended glob support: */
457 static int globhack(const char *src, int flags, glob_t *pglob);
458 static int glob_needed(const char *s);
459 static int xglob(o_string *dest, int flags, glob_t *pglob);
461 /* variable assignment: */
462 static int is_assignment(const char *s);
463 /* data structure manipulation: */
465 static int setup_redirect(struct p_context *ctx, int fd, redir_type style, struct in_str *input);
467 static void initialize_context(struct p_context *ctx);
468 static int done_word(o_string *dest, struct p_context *ctx);
469 static int done_command(struct p_context *ctx);
470 static int done_pipe(struct p_context *ctx, pipe_style type);
471 /* primary string parsing: */
473 static int redirect_dup_num(struct in_str *input);
474 static int redirect_opt_num(o_string *o);
475 static int process_command_subs(o_string *dest, struct p_context *ctx, struct in_str *input, int subst_end);
476 static int parse_group(o_string *dest, struct p_context *ctx, struct in_str *input, int ch);
478 static char *lookup_param(char *src);
479 static char *make_string(char **inp);
480 static int handle_dollar(o_string *dest, struct p_context *ctx, struct in_str *input);
482 static int parse_string(o_string *dest, struct p_context *ctx, const char *src);
484 static int parse_stream(o_string *dest, struct p_context *ctx, struct in_str *input0, int end_trigger);
486 static int parse_stream_outer(struct in_str *inp, int flag);
488 static int parse_string_outer(const char *s, int flag);
489 static int parse_file_outer(FILE *f);
492 /* job management: */
493 static int checkjobs(struct pipe* fg_pipe);
494 static void insert_bg_job(struct pipe *pi);
495 static void remove_bg_job(struct pipe *pi);
497 /* local variable support */
498 static char **make_list_in(char **inp, char *name);
499 static char *insert_var_value(char *inp);
500 static char *get_local_var(const char *var);
503 /* Table of built-in functions. They can be forked or not, depending on
504 * context: within pipes, they fork. As simple commands, they do not.
505 * When used in non-forking context, they can change global variables
506 * in the parent shell process. If forked, of course they can not.
507 * For example, 'unset foo | whatever' will parse and run, but foo will
508 * still be set at the end. */
509 static struct built_in_command bltins[] = {
510 {"bg", "Resume a job in the background", builtin_fg_bg},
511 {"break", "Exit for, while or until loop", builtin_not_written},
512 {"cd", "Change working directory", builtin_cd},
513 {"continue", "Continue for, while or until loop", builtin_not_written},
514 {"env", "Print all environment variables", builtin_env},
515 {"eval", "Construct and run shell command", builtin_eval},
516 {"exec", "Exec command, replacing this shell with the exec'd process",
518 {"exit", "Exit from shell()", builtin_exit},
519 {"export", "Set environment variable", builtin_export},
520 {"fg", "Bring job into the foreground", builtin_fg_bg},
521 {"jobs", "Lists the active jobs", builtin_jobs},
522 {"pwd", "Print current directory", builtin_pwd},
523 {"read", "Input environment variable", builtin_read},
524 {"return", "Return from a function", builtin_not_written},
525 {"set", "Set/unset shell local variables", builtin_set},
526 {"shift", "Shift positional parameters", builtin_shift},
527 {"trap", "Trap signals", builtin_not_written},
528 {"ulimit","Controls resource limits", builtin_not_written},
529 {"umask","Sets file creation mask", builtin_umask},
530 {"unset", "Unset environment variable", builtin_unset},
531 {".", "Source-in and run commands in a file", builtin_source},
532 {"help", "List shell built-in commands", builtin_help},
536 static const char *set_cwd(void)
539 cwd = NULL; /* xgetcwd(arg) called free(arg) */
540 cwd = xgetcwd((char *)cwd);
546 /* built-in 'eval' handler */
547 static int builtin_eval(struct child_prog *child)
550 int rcode = EXIT_SUCCESS;
552 if (child->argv[1]) {
553 str = make_string(child->argv + 1);
554 parse_string_outer(str, FLAG_EXIT_FROM_LOOP |
555 FLAG_PARSE_SEMICOLON);
557 rcode = last_return_code;
562 /* built-in 'cd <path>' handler */
563 static int builtin_cd(struct child_prog *child)
566 if (child->argv[1] == NULL)
567 newdir = getenv("HOME");
569 newdir = child->argv[1];
571 printf("cd: %s: %s\n", newdir, strerror(errno));
578 /* built-in 'env' handler */
579 static int builtin_env(struct child_prog *dummy)
582 if (e == NULL) return EXIT_FAILURE;
589 /* built-in 'exec' handler */
590 static int builtin_exec(struct child_prog *child)
592 if (child->argv[1] == NULL)
593 return EXIT_SUCCESS; /* Really? */
599 /* built-in 'exit' handler */
600 static int builtin_exit(struct child_prog *child)
602 if (child->argv[1] == NULL)
603 exit(last_return_code);
604 exit (atoi(child->argv[1]));
607 /* built-in 'export VAR=value' handler */
608 static int builtin_export(struct child_prog *child)
611 char *name = child->argv[1];
614 return (builtin_env(child));
620 char *value = strchr(name, '=');
624 /* They are exporting something without an =VALUE */
626 value = get_local_var(name);
628 size_t ln = strlen(name);
630 tmp = realloc(name, ln+strlen(value)+2);
634 sprintf(tmp+ln, "=%s", value);
638 /* bash does not return an error when trying to export
639 * an undefined variable. Do likewise. */
645 perror_msg("export");
647 res = set_local_var(name, 1);
654 /* built-in 'fg' and 'bg' handler */
655 static int builtin_fg_bg(struct child_prog *child)
658 struct pipe *pi=NULL;
662 /* If they gave us no args, assume they want the last backgrounded task */
663 if (!child->argv[1]) {
664 for (pi = job_list; pi; pi = pi->next) {
665 if (pi->jobid == last_jobid) {
670 error_msg("%s: no current job", child->argv[0]);
674 if (sscanf(child->argv[1], "%%%d", &jobnum) != 1) {
675 error_msg("%s: bad argument '%s'", child->argv[0], child->argv[1]);
678 for (pi = job_list; pi; pi = pi->next) {
679 if (pi->jobid == jobnum) {
684 error_msg("%s: %d: no such job", child->argv[0], jobnum);
689 if (*child->argv[0] == 'f') {
690 /* Put the job into the foreground. */
691 tcsetpgrp(shell_terminal, pi->pgrp);
694 /* Restart the processes in the job */
695 for (i = 0; i < pi->num_progs; i++)
696 pi->progs[i].is_stopped = 0;
698 if ( (i=kill(- pi->pgrp, SIGCONT)) < 0) {
702 perror_msg("kill (SIGCONT)");
706 pi->stopped_progs = 0;
710 /* built-in 'help' handler */
711 static int builtin_help(struct child_prog *dummy)
713 struct built_in_command *x;
715 printf("\nBuilt-in commands:\n");
716 printf("-------------------\n");
717 for (x = bltins; x->cmd; x++) {
720 printf("%s\t%s\n", x->cmd, x->descr);
726 /* built-in 'jobs' handler */
727 static int builtin_jobs(struct child_prog *child)
732 for (job = job_list; job; job = job->next) {
733 if (job->running_progs == job->stopped_progs)
734 status_string = "Stopped";
736 status_string = "Running";
738 printf(JOB_STATUS_FORMAT, job->jobid, status_string, job->text);
744 /* built-in 'pwd' handler */
745 static int builtin_pwd(struct child_prog *dummy)
751 /* built-in 'read VAR' handler */
752 static int builtin_read(struct child_prog *child)
756 if (child->argv[1]) {
760 string[0] = 0; /* In case stdin has only EOF */
762 fgets(string, sizeof(string), stdin);
764 var = malloc(strlen(child->argv[1])+strlen(string)+2);
766 sprintf(var, "%s=%s", child->argv[1], string);
767 res = set_local_var(var, 0);
771 fprintf(stderr, "read: %m\n");
772 free(var); /* So not move up to avoid breaking errno */
775 do res=getchar(); while(res!='\n' && res!=EOF);
780 /* built-in 'set VAR=value' handler */
781 static int builtin_set(struct child_prog *child)
783 char *temp = child->argv[1];
787 for(e = top_vars; e; e=e->next)
788 printf("%s=%s\n", e->name, e->value);
790 set_local_var(temp, 0);
796 /* Built-in 'shift' handler */
797 static int builtin_shift(struct child_prog *child)
800 if (child->argv[1]) {
801 n=atoi(child->argv[1]);
803 if (n>=0 && n<global_argc) {
804 /* XXX This probably breaks $0 */
813 /* Built-in '.' handler (read-in and execute commands from file) */
814 static int builtin_source(struct child_prog *child)
819 if (child->argv[1] == NULL)
822 /* XXX search through $PATH is missing */
823 input = fopen(child->argv[1], "r");
825 error_msg("Couldn't open file '%s'", child->argv[1]);
829 /* Now run the file */
830 /* XXX argv and argc are broken; need to save old global_argv
831 * (pointer only is OK!) on this stack frame,
832 * set global_argv=child->argv+1, recurse, and restore. */
833 mark_open(fileno(input));
834 status = parse_file_outer(input);
835 mark_closed(fileno(input));
840 static int builtin_umask(struct child_prog *child)
843 const char *arg = child->argv[1];
846 new_umask=strtoul(arg, &end, 8);
847 if (*end!='\0' || end == arg) {
851 printf("%.3o\n", (unsigned int) (new_umask=umask(0)));
857 /* built-in 'unset VAR' handler */
858 static int builtin_unset(struct child_prog *child)
860 /* bash returned already true */
861 unset_local_var(child->argv[1]);
865 static int builtin_not_written(struct child_prog *child)
867 printf("builtin_%s not written\n",child->argv[0]);
872 static int b_check_space(o_string *o, int len)
874 /* It would be easy to drop a more restrictive policy
875 * in here, such as setting a maximum string length */
876 if (o->length + len > o->maxlen) {
877 char *old_data = o->data;
878 /* assert (data == NULL || o->maxlen != 0); */
879 o->maxlen += max(2*len, B_CHUNK);
880 o->data = realloc(o->data, 1 + o->maxlen);
881 if (o->data == NULL) {
885 return o->data == NULL;
888 static int b_addchr(o_string *o, int ch)
890 debug_printf("b_addchr: %c %d %p\n", ch, o->length, o);
891 if (b_check_space(o, 1)) return B_NOSPAC;
892 o->data[o->length] = ch;
894 o->data[o->length] = '\0';
898 static void b_reset(o_string *o)
902 if (o->data != NULL) *o->data = '\0';
905 static void b_free(o_string *o)
913 /* My analysis of quoting semantics tells me that state information
914 * is associated with a destination, not a source.
916 static int b_addqchr(o_string *o, int ch, int quote)
918 if (quote && strchr("*?[\\",ch)) {
920 rc = b_addchr(o, '\\');
923 return b_addchr(o, ch);
926 /* belongs in utility.c */
927 char *simple_itoa(unsigned int i)
929 /* 21 digits plus null terminator, good for 64-bit or smaller ints */
930 static char local[22];
931 char *p = &local[21];
941 static int b_adduint(o_string *o, unsigned int i)
944 char *p = simple_itoa(i);
945 /* no escape checking necessary */
946 do r=b_addchr(o, *p++); while (r==0 && *p);
951 static int static_get(struct in_str *i)
954 if (ch=='\0') return EOF;
958 static int static_peek(struct in_str *i)
964 static inline void cmdedit_set_initial_prompt(void)
966 #ifndef CONFIG_FEATURE_SH_FANCY_PROMPT
975 static inline void setup_prompt_string(int promptmode, char **prompt_str)
977 debug_printf("setup_prompt_string %d ",promptmode);
978 #ifndef CONFIG_FEATURE_SH_FANCY_PROMPT
979 /* Set up the prompt */
980 if (promptmode == 1) {
982 PS1=xmalloc(strlen(cwd)+4);
983 sprintf(PS1, "%s %s", cwd, ( geteuid() != 0 ) ? "$ ":"# ");
989 *prompt_str = (promptmode==1)? PS1 : PS2;
991 debug_printf("result %s\n",*prompt_str);
995 static void get_user_input(struct in_str *i)
999 static char the_command[BUFSIZ];
1001 setup_prompt_string(i->promptmode, &prompt_str);
1002 #ifdef CONFIG_FEATURE_COMMAND_EDITING
1004 ** enable command line editing only while a command line
1005 ** is actually being read; otherwise, we'll end up bequeathing
1006 ** atexit() handlers and other unwanted stuff to our
1007 ** child processes (rob@sysgo.de)
1009 cmdedit_read_input(prompt_str, the_command);
1011 fputs(prompt_str, stdout);
1013 the_command[0]=fgetc(i->file);
1014 the_command[1]='\0';
1019 extern char console_buffer[];
1021 static char the_command[CONFIG_SYS_CBSIZE];
1023 #ifdef CONFIG_BOOT_RETRY_TIME
1024 # ifdef CONFIG_RESET_TO_RETRY
1025 extern int do_reset (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]);
1027 # error "This currently only works with CONFIG_RESET_TO_RETRY enabled"
1029 reset_cmd_timeout();
1032 if (i->promptmode == 1) {
1033 n = readline(CONFIG_SYS_PROMPT);
1035 n = readline(CONFIG_SYS_PROMPT_HUSH_PS2);
1037 #ifdef CONFIG_BOOT_RETRY_TIME
1039 puts("\nTimeout waiting for command\n");
1040 # ifdef CONFIG_RESET_TO_RETRY
1041 do_reset(NULL, 0, 0, NULL);
1043 # error "This currently only works with CONFIG_RESET_TO_RETRY enabled"
1051 n = strlen(console_buffer);
1052 console_buffer[n] = '\n';
1053 console_buffer[n+1]= '\0';
1054 if (had_ctrlc()) flag_repeat = 0;
1057 if (i->promptmode == 1) {
1058 if (console_buffer[0] == '\n'&& flag_repeat == 0) {
1059 strcpy(the_command,console_buffer);
1062 if (console_buffer[0] != '\n') {
1063 strcpy(the_command,console_buffer);
1073 if (console_buffer[0] != '\n') {
1074 if (strlen(the_command) + strlen(console_buffer)
1075 < CONFIG_SYS_CBSIZE) {
1076 n = strlen(the_command);
1077 the_command[n-1] = ' ';
1078 strcpy(&the_command[n],console_buffer);
1081 the_command[0] = '\n';
1082 the_command[1] = '\0';
1086 if (i->__promptme == 0) {
1087 the_command[0] = '\n';
1088 the_command[1] = '\0';
1090 i->p = console_buffer;
1095 /* This is the magic location that prints prompts
1096 * and gets data back from the user */
1097 static int file_get(struct in_str *i)
1102 /* If there is data waiting, eat it up */
1103 if (i->p && *i->p) {
1106 /* need to double check i->file because we might be doing something
1107 * more complicated by now, like sourcing or substituting. */
1109 if (i->__promptme && interactive && i->file == stdin) {
1110 while(! i->p || (interactive && strlen(i->p)==0) ) {
1112 while(! i->p || strlen(i->p)==0 ) {
1120 if (i->p && *i->p) {
1125 ch = fgetc(i->file);
1129 debug_printf("b_getch: got a %d\n", ch);
1132 if (ch == '\n') i->__promptme=1;
1137 /* All the callers guarantee this routine will never be
1138 * used right after a newline, so prompting is not needed.
1140 static int file_peek(struct in_str *i)
1143 if (i->p && *i->p) {
1148 i->peek_buf[0] = fgetc(i->file);
1149 i->peek_buf[1] = '\0';
1151 debug_printf("b_peek: got a %d\n", *i->p);
1158 static void setup_file_in_str(struct in_str *i, FILE *f)
1160 static void setup_file_in_str(struct in_str *i)
1163 i->peek = file_peek;
1173 static void setup_string_in_str(struct in_str *i, const char *s)
1175 i->peek = static_peek;
1176 i->get = static_get;
1183 static void mark_open(int fd)
1185 struct close_me *new = xmalloc(sizeof(struct close_me));
1187 new->next = close_me_head;
1188 close_me_head = new;
1191 static void mark_closed(int fd)
1193 struct close_me *tmp;
1194 if (close_me_head == NULL || close_me_head->fd != fd)
1195 error_msg_and_die("corrupt close_me");
1196 tmp = close_me_head;
1197 close_me_head = close_me_head->next;
1201 static void close_all(void)
1204 for (c=close_me_head; c; c=c->next) {
1207 close_me_head = NULL;
1210 /* squirrel != NULL means we squirrel away copies of stdin, stdout,
1211 * and stderr if they are redirected. */
1212 static int setup_redirects(struct child_prog *prog, int squirrel[])
1215 struct redir_struct *redir;
1217 for (redir=prog->redirects; redir; redir=redir->next) {
1218 if (redir->dup == -1 && redir->word.gl_pathv == NULL) {
1219 /* something went wrong in the parse. Pretend it didn't happen */
1222 if (redir->dup == -1) {
1223 mode=redir_table[redir->type].mode;
1224 openfd = open(redir->word.gl_pathv[0], mode, 0666);
1226 /* this could get lost if stderr has been redirected, but
1227 bash and ash both lose it as well (though zsh doesn't!) */
1228 perror_msg("error opening %s", redir->word.gl_pathv[0]);
1232 openfd = redir->dup;
1235 if (openfd != redir->fd) {
1236 if (squirrel && redir->fd < 3) {
1237 squirrel[redir->fd] = dup(redir->fd);
1242 dup2(openfd, redir->fd);
1243 if (redir->dup == -1)
1251 static void restore_redirects(int squirrel[])
1254 for (i=0; i<3; i++) {
1257 /* No error checking. I sure wouldn't know what
1258 * to do with an error if I found one! */
1266 /* XXX no exit() here. If you don't exec, use _exit instead.
1267 * The at_exit handlers apparently confuse the calling process,
1268 * in particular stdin handling. Not sure why? */
1269 static void pseudo_exec(struct child_prog *child)
1273 struct built_in_command *x;
1275 for (i=0; is_assignment(child->argv[i]); i++) {
1276 debug_printf("pid %d environment modification: %s\n",getpid(),child->argv[i]);
1277 p = insert_var_value(child->argv[i]);
1279 if (p != child->argv[i]) free(p);
1281 child->argv+=i; /* XXX this hack isn't so horrible, since we are about
1282 to exit, and therefore don't need to keep data
1283 structures consistent for free() use. */
1284 /* If a variable is assigned in a forest, and nobody listens,
1285 * was it ever really set?
1287 if (child->argv[0] == NULL) {
1288 _exit(EXIT_SUCCESS);
1292 * Check if the command matches any of the builtins.
1293 * Depending on context, this might be redundant. But it's
1294 * easier to waste a few CPU cycles than it is to figure out
1295 * if this is one of those cases.
1297 for (x = bltins; x->cmd; x++) {
1298 if (strcmp(child->argv[0], x->cmd) == 0 ) {
1299 debug_printf("builtin exec %s\n", child->argv[0]);
1300 rcode = x->function(child);
1306 /* Check if the command matches any busybox internal commands
1308 * FIXME: This feature is not 100% safe, since
1309 * BusyBox is not fully reentrant, so we have no guarantee the things
1310 * from the .bss are still zeroed, or that things from .data are still
1311 * at their defaults. We could exec ourself from /proc/self/exe, but I
1312 * really dislike relying on /proc for things. We could exec ourself
1313 * from global_argv[0], but if we are in a chroot, we may not be able
1314 * to find ourself... */
1315 #ifdef CONFIG_FEATURE_SH_STANDALONE_SHELL
1318 char** argv_l=child->argv;
1319 char *name = child->argv[0];
1321 #ifdef CONFIG_FEATURE_SH_APPLETS_ALWAYS_WIN
1322 /* Following discussions from November 2000 on the busybox mailing
1323 * list, the default configuration, (without
1324 * get_last_path_component()) lets the user force use of an
1325 * external command by specifying the full (with slashes) filename.
1326 * If you enable CONFIG_FEATURE_SH_APPLETS_ALWAYS_WIN then applets
1327 * _aways_ override external commands, so if you want to run
1328 * /bin/cat, it will use BusyBox cat even if /bin/cat exists on the
1329 * filesystem and is _not_ busybox. Some systems may want this,
1331 name = get_last_path_component(name);
1333 /* Count argc for use in a second... */
1334 for(argc_l=0;*argv_l!=NULL; argv_l++, argc_l++);
1336 debug_printf("running applet %s\n", name);
1337 run_applet_by_name(name, argc_l, child->argv);
1340 debug_printf("exec of %s\n",child->argv[0]);
1341 execvp(child->argv[0],child->argv);
1342 perror_msg("couldn't exec: %s",child->argv[0]);
1344 } else if (child->group) {
1345 debug_printf("runtime nesting to group\n");
1346 interactive=0; /* crucial!!!! */
1347 rcode = run_list_real(child->group);
1348 /* OK to leak memory by not calling free_pipe_list,
1349 * since this process is about to exit */
1352 /* Can happen. See what bash does with ">foo" by itself. */
1353 debug_printf("trying to pseudo_exec null command\n");
1354 _exit(EXIT_SUCCESS);
1358 static void insert_bg_job(struct pipe *pi)
1360 struct pipe *thejob;
1362 /* Linear search for the ID of the job to use */
1364 for (thejob = job_list; thejob; thejob = thejob->next)
1365 if (thejob->jobid >= pi->jobid)
1366 pi->jobid = thejob->jobid + 1;
1368 /* add thejob to the list of running jobs */
1370 thejob = job_list = xmalloc(sizeof(*thejob));
1372 for (thejob = job_list; thejob->next; thejob = thejob->next) /* nothing */;
1373 thejob->next = xmalloc(sizeof(*thejob));
1374 thejob = thejob->next;
1377 /* physically copy the struct job */
1378 memcpy(thejob, pi, sizeof(struct pipe));
1379 thejob->next = NULL;
1380 thejob->running_progs = thejob->num_progs;
1381 thejob->stopped_progs = 0;
1382 thejob->text = xmalloc(BUFSIZ); /* cmdedit buffer size */
1384 /*if (pi->progs[0] && pi->progs[0].argv && pi->progs[0].argv[0]) */
1386 char *bar=thejob->text;
1387 char **foo=pi->progs[0].argv;
1388 while(foo && *foo) {
1389 bar += sprintf(bar, "%s ", *foo++);
1393 /* we don't wait for background thejobs to return -- append it
1394 to the list of backgrounded thejobs and leave it alone */
1395 printf("[%d] %d\n", thejob->jobid, thejob->progs[0].pid);
1396 last_bg_pid = thejob->progs[0].pid;
1397 last_jobid = thejob->jobid;
1400 /* remove a backgrounded job */
1401 static void remove_bg_job(struct pipe *pi)
1403 struct pipe *prev_pipe;
1405 if (pi == job_list) {
1406 job_list = pi->next;
1408 prev_pipe = job_list;
1409 while (prev_pipe->next != pi)
1410 prev_pipe = prev_pipe->next;
1411 prev_pipe->next = pi->next;
1414 last_jobid = job_list->jobid;
1418 pi->stopped_progs = 0;
1423 /* Checks to see if any processes have exited -- if they
1424 have, figure out why and see if a job has completed */
1425 static int checkjobs(struct pipe* fg_pipe)
1433 attributes = WUNTRACED;
1434 if (fg_pipe==NULL) {
1435 attributes |= WNOHANG;
1438 while ((childpid = waitpid(-1, &status, attributes)) > 0) {
1441 for (i=0; i < fg_pipe->num_progs; i++) {
1442 if (fg_pipe->progs[i].pid == childpid) {
1443 if (i==fg_pipe->num_progs-1)
1444 rcode=WEXITSTATUS(status);
1445 (fg_pipe->num_progs)--;
1451 for (pi = job_list; pi; pi = pi->next) {
1453 while (prognum < pi->num_progs && pi->progs[prognum].pid != childpid) {
1456 if (prognum < pi->num_progs)
1461 debug_printf("checkjobs: pid %d was not in our list!\n", childpid);
1465 if (WIFEXITED(status) || WIFSIGNALED(status)) {
1467 pi->running_progs--;
1468 pi->progs[prognum].pid = 0;
1470 if (!pi->running_progs) {
1471 printf(JOB_STATUS_FORMAT, pi->jobid, "Done", pi->text);
1476 pi->stopped_progs++;
1477 pi->progs[prognum].is_stopped = 1;
1480 /* Printing this stuff is a pain, since it tends to
1481 * overwrite the prompt an inconveinient moments. So
1483 if (pi->stopped_progs == pi->num_progs) {
1484 printf("\n"JOB_STATUS_FORMAT, pi->jobid, "Stopped", pi->text);
1490 if (childpid == -1 && errno != ECHILD)
1491 perror_msg("waitpid");
1493 /* move the shell to the foreground */
1494 /*if (interactive && tcsetpgrp(shell_terminal, getpgid(0))) */
1495 /* perror_msg("tcsetpgrp-2"); */
1499 /* Figure out our controlling tty, checking in order stderr,
1500 * stdin, and stdout. If check_pgrp is set, also check that
1501 * we belong to the foreground process group associated with
1502 * that tty. The value of shell_terminal is needed in order to call
1503 * tcsetpgrp(shell_terminal, ...); */
1504 void controlling_tty(int check_pgrp)
1508 if ((curpgrp = tcgetpgrp(shell_terminal = 2)) < 0
1509 && (curpgrp = tcgetpgrp(shell_terminal = 0)) < 0
1510 && (curpgrp = tcgetpgrp(shell_terminal = 1)) < 0)
1511 goto shell_terminal_error;
1513 if (check_pgrp && curpgrp != getpgid(0))
1514 goto shell_terminal_error;
1518 shell_terminal_error:
1519 shell_terminal = -1;
1524 /* run_pipe_real() starts all the jobs, but doesn't wait for anything
1525 * to finish. See checkjobs().
1527 * return code is normally -1, when the caller has to wait for children
1528 * to finish to determine the exit status of the pipe. If the pipe
1529 * is a simple builtin command, however, the action is done by the
1530 * time run_pipe_real returns, and the exit code is provided as the
1533 * The input of the pipe is always stdin, the output is always
1534 * stdout. The outpipe[] mechanism in BusyBox-0.48 lash is bogus,
1535 * because it tries to avoid running the command substitution in
1536 * subshell, when that is in fact necessary. The subshell process
1537 * now has its stdout directed to the input of the appropriate pipe,
1538 * so this routine is noticeably simpler.
1540 static int run_pipe_real(struct pipe *pi)
1544 int nextin, nextout;
1545 int pipefds[2]; /* pipefds[0] is for reading */
1546 struct child_prog *child;
1547 struct built_in_command *x;
1550 /* Avoid longjmp clobbering */
1558 int flag = do_repeat ? CMD_FLAG_REPEAT : 0;
1559 struct child_prog *child;
1563 /* Avoid longjmp clobbering */
1568 #endif /* __U_BOOT__ */
1575 /* Check if this is a simple builtin (not part of a pipe).
1576 * Builtins within pipes have to fork anyway, and are handled in
1577 * pseudo_exec. "echo foo | read bar" doesn't work on bash, either.
1579 if (pi->num_progs == 1) child = & (pi->progs[0]);
1581 if (pi->num_progs == 1 && child->group && child->subshell == 0) {
1582 int squirrel[] = {-1, -1, -1};
1584 debug_printf("non-subshell grouping\n");
1585 setup_redirects(child, squirrel);
1586 /* XXX could we merge code with following builtin case,
1587 * by creating a pseudo builtin that calls run_list_real? */
1588 rcode = run_list_real(child->group);
1589 restore_redirects(squirrel);
1591 if (pi->num_progs == 1 && child->group) {
1593 debug_printf("non-subshell grouping\n");
1594 rcode = run_list_real(child->group);
1597 } else if (pi->num_progs == 1 && pi->progs[0].argv != NULL) {
1598 for (i=0; is_assignment(child->argv[i]); i++) { /* nothing */ }
1599 if (i!=0 && child->argv[i]==NULL) {
1600 /* assignments, but no command: set the local environment */
1601 for (i=0; child->argv[i]!=NULL; i++) {
1603 /* Ok, this case is tricky. We have to decide if this is a
1604 * local variable, or an already exported variable. If it is
1605 * already exported, we have to export the new value. If it is
1606 * not exported, we need only set this as a local variable.
1607 * This junk is all to decide whether or not to export this
1611 name = xstrdup(child->argv[i]);
1612 debug_printf("Local environment set: %s\n", name);
1613 value = strchr(name, '=');
1617 if ( get_local_var(name)) {
1622 p = insert_var_value(child->argv[i]);
1623 set_local_var(p, export_me);
1624 if (p != child->argv[i]) free(p);
1626 return EXIT_SUCCESS; /* don't worry about errors in set_local_var() yet */
1628 for (i = 0; is_assignment(child->argv[i]); i++) {
1629 p = insert_var_value(child->argv[i]);
1633 set_local_var(p, 0);
1635 if (p != child->argv[i]) {
1643 str = make_string((child->argv + i));
1644 parse_string_outer(str, FLAG_EXIT_FROM_LOOP | FLAG_REPARSING);
1646 return last_return_code;
1649 for (x = bltins; x->cmd; x++) {
1650 if (strcmp(child->argv[i], x->cmd) == 0 ) {
1651 int squirrel[] = {-1, -1, -1};
1653 if (x->function == builtin_exec && child->argv[i+1]==NULL) {
1654 debug_printf("magic exec\n");
1655 setup_redirects(child,NULL);
1656 return EXIT_SUCCESS;
1658 debug_printf("builtin inline %s\n", child->argv[0]);
1659 /* XXX setup_redirects acts on file descriptors, not FILEs.
1660 * This is perfect for work that comes after exec().
1661 * Is it really safe for inline use? Experimentally,
1662 * things seem to work with glibc. */
1663 setup_redirects(child, squirrel);
1665 /* check ";", because ,example , argv consist from
1666 * "help;flinfo" must not execute
1668 if (strchr(child->argv[i], ';')) {
1669 printf ("Unknown command '%s' - try 'help' or use 'run' command\n",
1673 /* Look up command in command table */
1676 if ((cmdtp = find_cmd(child->argv[i])) == NULL) {
1677 printf ("Unknown command '%s' - try 'help'\n", child->argv[i]);
1678 return -1; /* give up after bad command */
1681 #if defined(CONFIG_CMD_BOOTD)
1682 /* avoid "bootd" recursion */
1683 if (cmdtp->cmd == do_bootd) {
1684 if (flag & CMD_FLAG_BOOTD) {
1685 printf ("'bootd' recursion detected\n");
1689 flag |= CMD_FLAG_BOOTD;
1692 /* found - check max args */
1693 if ((child->argc - i) > cmdtp->maxargs)
1694 return cmd_usage(cmdtp);
1696 child->argv+=i; /* XXX horrible hack */
1698 rcode = x->function(child);
1700 /* OK - call function to do the command */
1702 rcode = (cmdtp->cmd)
1703 (cmdtp, flag,child->argc-i,&child->argv[i]);
1704 if ( !cmdtp->repeatable )
1709 child->argv-=i; /* XXX restore hack so free() can work right */
1712 restore_redirects(squirrel);
1721 for (i = 0; i < pi->num_progs; i++) {
1722 child = & (pi->progs[i]);
1724 /* pipes are inserted between pairs of commands */
1725 if ((i + 1) < pi->num_progs) {
1726 if (pipe(pipefds)<0) perror_msg_and_die("pipe");
1727 nextout = pipefds[1];
1733 /* XXX test for failed fork()? */
1734 if (!(child->pid = fork())) {
1735 /* Set the handling for job control signals back to the default. */
1736 signal(SIGINT, SIG_DFL);
1737 signal(SIGQUIT, SIG_DFL);
1738 signal(SIGTERM, SIG_DFL);
1739 signal(SIGTSTP, SIG_DFL);
1740 signal(SIGTTIN, SIG_DFL);
1741 signal(SIGTTOU, SIG_DFL);
1742 signal(SIGCHLD, SIG_DFL);
1754 if (pipefds[0]!=-1) {
1755 close(pipefds[0]); /* opposite end of our output pipe */
1758 /* Like bash, explicit redirects override pipes,
1759 * and the pipe fd is available for dup'ing. */
1760 setup_redirects(child,NULL);
1762 if (interactive && pi->followup!=PIPE_BG) {
1763 /* If we (the child) win the race, put ourselves in the process
1764 * group whose leader is the first process in this pipe. */
1766 pi->pgrp = getpid();
1768 if (setpgid(0, pi->pgrp) == 0) {
1769 tcsetpgrp(2, pi->pgrp);
1777 /* put our child in the process group whose leader is the
1778 first process in this pipe */
1780 pi->pgrp = child->pid;
1782 /* Don't check for errors. The child may be dead already,
1783 * in which case setpgid returns error code EACCES. */
1784 setpgid(child->pid, pi->pgrp);
1791 /* If there isn't another process, nextin is garbage
1792 but it doesn't matter */
1793 nextin = pipefds[0];
1799 static int run_list_real(struct pipe *pi)
1801 char *save_name = NULL;
1803 char **save_list = NULL;
1809 int rcode=0, flag_skip=1;
1810 int flag_restore = 0;
1811 int if_code=0, next_if_code=0; /* need double-buffer to handle elif */
1812 reserved_style rmode, skip_more_in_this_rmode=RES_XXXX;
1813 /* check syntax for "for" */
1814 for (rpipe = pi; rpipe; rpipe = rpipe->next) {
1815 if ((rpipe->r_mode == RES_IN ||
1816 rpipe->r_mode == RES_FOR) &&
1817 (rpipe->next == NULL)) {
1824 if ((rpipe->r_mode == RES_IN &&
1825 (rpipe->next->r_mode == RES_IN &&
1826 rpipe->next->progs->argv != NULL))||
1827 (rpipe->r_mode == RES_FOR &&
1828 rpipe->next->r_mode != RES_IN)) {
1836 for (; pi; pi = (flag_restore != 0) ? rpipe : pi->next) {
1837 if (pi->r_mode == RES_WHILE || pi->r_mode == RES_UNTIL ||
1838 pi->r_mode == RES_FOR) {
1842 if ((had_ctrlc())) {
1853 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);
1854 if (rmode == skip_more_in_this_rmode && flag_skip) {
1855 if (pi->followup == PIPE_SEQ) flag_skip=0;
1859 skip_more_in_this_rmode = RES_XXXX;
1860 if (rmode == RES_THEN || rmode == RES_ELSE) if_code = next_if_code;
1861 if (rmode == RES_THEN && if_code) continue;
1862 if (rmode == RES_ELSE && !if_code) continue;
1863 if (rmode == RES_ELIF && !if_code) break;
1864 if (rmode == RES_FOR && pi->num_progs) {
1866 /* if no variable values after "in" we skip "for" */
1867 if (!pi->next->progs->argv) continue;
1868 /* create list of variable values */
1869 list = make_list_in(pi->next->progs->argv,
1870 pi->progs->argv[0]);
1872 save_name = pi->progs->argv[0];
1873 pi->progs->argv[0] = NULL;
1877 free(pi->progs->argv[0]);
1881 pi->progs->argv[0] = save_name;
1883 pi->progs->glob_result.gl_pathv[0] =
1888 /* insert new value from list for variable */
1889 if (pi->progs->argv[0])
1890 free(pi->progs->argv[0]);
1891 pi->progs->argv[0] = *list++;
1893 pi->progs->glob_result.gl_pathv[0] =
1898 if (rmode == RES_IN) continue;
1899 if (rmode == RES_DO) {
1900 if (!flag_rep) continue;
1902 if ((rmode == RES_DONE)) {
1909 if (pi->num_progs == 0) continue;
1911 save_num_progs = pi->num_progs; /* save number of programs */
1913 rcode = run_pipe_real(pi);
1914 debug_printf("run_pipe_real returned %d\n",rcode);
1917 /* We only ran a builtin: rcode was set by the return value
1918 * of run_pipe_real(), and we don't need to wait for anything. */
1919 } else if (pi->followup==PIPE_BG) {
1920 /* XXX check bash's behavior with nontrivial pipes */
1921 /* XXX compute jobid */
1922 /* XXX what does bash do with attempts to background builtins? */
1924 rcode = EXIT_SUCCESS;
1927 /* move the new process group into the foreground */
1928 if (tcsetpgrp(shell_terminal, pi->pgrp) && errno != ENOTTY)
1929 perror_msg("tcsetpgrp-3");
1930 rcode = checkjobs(pi);
1931 /* move the shell to the foreground */
1932 if (tcsetpgrp(shell_terminal, getpgid(0)) && errno != ENOTTY)
1933 perror_msg("tcsetpgrp-4");
1935 rcode = checkjobs(pi);
1937 debug_printf("checkjobs returned %d\n",rcode);
1939 last_return_code=rcode;
1942 last_return_code = -rcode - 2;
1943 return -2; /* exit */
1945 last_return_code=(rcode == 0) ? 0 : 1;
1948 pi->num_progs = save_num_progs; /* restore number of programs */
1950 if ( rmode == RES_IF || rmode == RES_ELIF )
1951 next_if_code=rcode; /* can be overwritten a number of times */
1952 if (rmode == RES_WHILE)
1953 flag_rep = !last_return_code;
1954 if (rmode == RES_UNTIL)
1955 flag_rep = last_return_code;
1956 if ( (rcode==EXIT_SUCCESS && pi->followup==PIPE_OR) ||
1957 (rcode!=EXIT_SUCCESS && pi->followup==PIPE_AND) )
1958 skip_more_in_this_rmode=rmode;
1966 /* broken, of course, but OK for testing */
1967 static char *indenter(int i)
1969 static char blanks[]=" ";
1970 return &blanks[sizeof(blanks)-i-1];
1973 /* return code is the exit status of the pipe */
1974 static int free_pipe(struct pipe *pi, int indent)
1977 struct child_prog *child;
1979 struct redir_struct *r, *rnext;
1981 int a, i, ret_code=0;
1982 char *ind = indenter(indent);
1985 if (pi->stopped_progs > 0)
1987 final_printf("%s run pipe: (pid %d)\n",ind,getpid());
1989 for (i=0; i<pi->num_progs; i++) {
1990 child = &pi->progs[i];
1991 final_printf("%s command %d:\n",ind,i);
1993 for (a=0,p=child->argv; *p; a++,p++) {
1994 final_printf("%s argv[%d] = %s\n",ind,a,*p);
1997 globfree(&child->glob_result);
1999 for (a = 0; a < child->argc; a++) {
2000 free(child->argv[a]);
2006 } else if (child->group) {
2008 final_printf("%s begin group (subshell:%d)\n",ind, child->subshell);
2010 ret_code = free_pipe_list(child->group,indent+3);
2011 final_printf("%s end group\n",ind);
2013 final_printf("%s (nil)\n",ind);
2016 for (r=child->redirects; r; r=rnext) {
2017 final_printf("%s redirect %d%s", ind, r->fd, redir_table[r->type].descrip);
2019 /* guard against the case >$FOO, where foo is unset or blank */
2020 if (r->word.gl_pathv) {
2021 final_printf(" %s\n", *r->word.gl_pathv);
2025 final_printf("&%d\n", r->dup);
2030 child->redirects=NULL;
2033 free(pi->progs); /* children are an array, they get freed all at once */
2038 static int free_pipe_list(struct pipe *head, int indent)
2040 int rcode=0; /* if list has no members */
2041 struct pipe *pi, *next;
2042 char *ind = indenter(indent);
2043 for (pi=head; pi; pi=next) {
2044 final_printf("%s pipe reserved mode %d\n", ind, pi->r_mode);
2045 rcode = free_pipe(pi, indent);
2046 final_printf("%s pipe followup code %d\n", ind, pi->followup);
2054 /* Select which version we will use */
2055 static int run_list(struct pipe *pi)
2061 rcode = run_list_real(pi);
2065 /* free_pipe_list has the side effect of clearing memory
2066 * In the long run that function can be merged with run_list_real,
2067 * but doing that now would hobble the debugging effort. */
2068 free_pipe_list(pi,0);
2072 /* The API for glob is arguably broken. This routine pushes a non-matching
2073 * string into the output structure, removing non-backslashed backslashes.
2074 * If someone can prove me wrong, by performing this function within the
2075 * original glob(3) api, feel free to rewrite this routine into oblivion.
2076 * Return code (0 vs. GLOB_NOSPACE) matches glob(3).
2077 * XXX broken if the last character is '\\', check that before calling.
2080 static int globhack(const char *src, int flags, glob_t *pglob)
2085 for (cnt=1, s=src; s && *s; s++) {
2086 if (*s == '\\') s++;
2090 if (!dest) return GLOB_NOSPACE;
2091 if (!(flags & GLOB_APPEND)) {
2092 pglob->gl_pathv=NULL;
2097 pathc = ++pglob->gl_pathc;
2098 pglob->gl_pathv = realloc(pglob->gl_pathv, (pathc+1)*sizeof(*pglob->gl_pathv));
2099 if (pglob->gl_pathv == NULL) return GLOB_NOSPACE;
2100 pglob->gl_pathv[pathc-1]=dest;
2101 pglob->gl_pathv[pathc]=NULL;
2102 for (s=src; s && *s; s++, dest++) {
2103 if (*s == '\\') s++;
2110 /* XXX broken if the last character is '\\', check that before calling */
2111 static int glob_needed(const char *s)
2114 if (*s == '\\') s++;
2115 if (strchr("*[?",*s)) return 1;
2121 static void globprint(glob_t *pglob)
2124 debug_printf("glob_t at %p:\n", pglob);
2125 debug_printf(" gl_pathc=%d gl_pathv=%p gl_offs=%d gl_flags=%d\n",
2126 pglob->gl_pathc, pglob->gl_pathv, pglob->gl_offs, pglob->gl_flags);
2127 for (i=0; i<pglob->gl_pathc; i++)
2128 debug_printf("pglob->gl_pathv[%d] = %p = %s\n", i,
2129 pglob->gl_pathv[i], pglob->gl_pathv[i]);
2133 static int xglob(o_string *dest, int flags, glob_t *pglob)
2137 /* short-circuit for null word */
2138 /* we can code this better when the debug_printf's are gone */
2139 if (dest->length == 0) {
2140 if (dest->nonnull) {
2141 /* bash man page calls this an "explicit" null */
2142 gr = globhack(dest->data, flags, pglob);
2143 debug_printf("globhack returned %d\n",gr);
2147 } else if (glob_needed(dest->data)) {
2148 gr = glob(dest->data, flags, NULL, pglob);
2149 debug_printf("glob returned %d\n",gr);
2150 if (gr == GLOB_NOMATCH) {
2151 /* quote removal, or more accurately, backslash removal */
2152 gr = globhack(dest->data, flags, pglob);
2153 debug_printf("globhack returned %d\n",gr);
2156 gr = globhack(dest->data, flags, pglob);
2157 debug_printf("globhack returned %d\n",gr);
2159 if (gr == GLOB_NOSPACE)
2160 error_msg_and_die("out of memory during glob");
2161 if (gr != 0) { /* GLOB_ABORTED ? */
2162 error_msg("glob(3) error %d",gr);
2164 /* globprint(glob_target); */
2170 static char *get_dollar_var(char ch);
2173 /* This is used to get/check local shell variables */
2174 static char *get_local_var(const char *s)
2176 struct variables *cur;
2183 return get_dollar_var(s[1]);
2186 for (cur = top_vars; cur; cur=cur->next)
2187 if(strcmp(cur->name, s)==0)
2192 /* This is used to set local shell variables
2193 flg_export==0 if only local (not exporting) variable
2194 flg_export==1 if "new" exporting environ
2195 flg_export>1 if current startup environ (not call putenv()) */
2196 int set_local_var(const char *s, int flg_export)
2200 struct variables *cur;
2203 /* might be possible! */
2211 if (getenv(name) != NULL) {
2213 "There is a global environment variable with the same name.\n");
2218 /* Assume when we enter this function that we are already in
2219 * NAME=VALUE format. So the first order of business is to
2220 * split 's' on the '=' into 'name' and 'value' */
2221 value = strchr(name, '=');
2222 if (value==0 && ++value==0) {
2228 for(cur = top_vars; cur; cur = cur->next) {
2229 if(strcmp(cur->name, name)==0)
2234 if(strcmp(cur->value, value)==0) {
2235 if(flg_export>0 && cur->flg_export==0)
2236 cur->flg_export=flg_export;
2240 if(cur->flg_read_only) {
2241 error_msg("%s: readonly variable", name);
2244 if(flg_export>0 || cur->flg_export>1)
2248 cur->value = strdup(value);
2252 cur = malloc(sizeof(struct variables));
2256 cur->name = strdup(name);
2257 if(cur->name == 0) {
2261 struct variables *bottom = top_vars;
2262 cur->value = strdup(value);
2264 cur->flg_export = flg_export;
2265 cur->flg_read_only = 0;
2266 while(bottom->next) bottom=bottom->next;
2273 if(result==0 && cur->flg_export==1) {
2275 result = putenv(name);
2280 if(result>0) /* equivalent to previous set */
2287 void unset_local_var(const char *name)
2289 struct variables *cur;
2292 for (cur = top_vars; cur; cur=cur->next) {
2293 if(strcmp(cur->name, name)==0)
2297 struct variables *next = top_vars;
2298 if(cur->flg_read_only) {
2299 error_msg("%s: readonly variable", name);
2304 unsetenv(cur->name);
2308 while (next->next != cur)
2310 next->next = cur->next;
2317 static int is_assignment(const char *s)
2322 if (!isalpha(*s)) return 0;
2324 while(isalnum(*s) || *s=='_') ++s;
2329 /* the src parameter allows us to peek forward to a possible &n syntax
2330 * for file descriptor duplication, e.g., "2>&1".
2331 * Return code is 0 normally, 1 if a syntax error is detected in src.
2332 * Resource errors (in xmalloc) cause the process to exit */
2333 static int setup_redirect(struct p_context *ctx, int fd, redir_type style,
2334 struct in_str *input)
2336 struct child_prog *child=ctx->child;
2337 struct redir_struct *redir = child->redirects;
2338 struct redir_struct *last_redir=NULL;
2340 /* Create a new redir_struct and drop it onto the end of the linked list */
2345 redir = xmalloc(sizeof(struct redir_struct));
2347 redir->word.gl_pathv=NULL;
2349 last_redir->next=redir;
2351 child->redirects=redir;
2355 redir->fd= (fd==-1) ? redir_table[style].default_fd : fd ;
2357 debug_printf("Redirect type %d%s\n", redir->fd, redir_table[style].descrip);
2359 /* Check for a '2>&1' type redirect */
2360 redir->dup = redirect_dup_num(input);
2361 if (redir->dup == -2) return 1; /* syntax error */
2362 if (redir->dup != -1) {
2363 /* Erik had a check here that the file descriptor in question
2364 * is legit; I postpone that to "run time"
2365 * A "-" representation of "close me" shows up as a -3 here */
2366 debug_printf("Duplicating redirect '%d>&%d'\n", redir->fd, redir->dup);
2368 /* We do _not_ try to open the file that src points to,
2369 * since we need to return and let src be expanded first.
2370 * Set ctx->pending_redirect, so we know what to do at the
2371 * end of the next parsed word.
2373 ctx->pending_redirect = redir;
2379 struct pipe *new_pipe(void) {
2381 pi = xmalloc(sizeof(struct pipe));
2385 pi->followup = 0; /* invalid */
2386 pi->r_mode = RES_NONE;
2390 static void initialize_context(struct p_context *ctx)
2394 ctx->pending_redirect=NULL;
2397 ctx->list_head=new_pipe();
2398 ctx->pipe=ctx->list_head;
2404 done_command(ctx); /* creates the memory for working child */
2407 /* normal return is 0
2408 * if a reserved word is found, and processed, return 1
2409 * should handle if, then, elif, else, fi, for, while, until, do, done.
2410 * case, function, and select are obnoxious, save those for later.
2412 struct reserved_combo {
2417 /* Mostly a list of accepted follow-up reserved words.
2418 * FLAG_END means we are done with the sequence, and are ready
2419 * to turn the compound list into a command.
2420 * FLAG_START means the word must start a new compound list.
2422 static struct reserved_combo reserved_list[] = {
2423 { "if", RES_IF, FLAG_THEN | FLAG_START },
2424 { "then", RES_THEN, FLAG_ELIF | FLAG_ELSE | FLAG_FI },
2425 { "elif", RES_ELIF, FLAG_THEN },
2426 { "else", RES_ELSE, FLAG_FI },
2427 { "fi", RES_FI, FLAG_END },
2428 { "for", RES_FOR, FLAG_IN | FLAG_START },
2429 { "while", RES_WHILE, FLAG_DO | FLAG_START },
2430 { "until", RES_UNTIL, FLAG_DO | FLAG_START },
2431 { "in", RES_IN, FLAG_DO },
2432 { "do", RES_DO, FLAG_DONE },
2433 { "done", RES_DONE, FLAG_END }
2435 #define NRES (sizeof(reserved_list)/sizeof(struct reserved_combo))
2437 int reserved_word(o_string *dest, struct p_context *ctx)
2439 struct reserved_combo *r;
2440 for (r=reserved_list;
2441 r<reserved_list+NRES; r++) {
2442 if (strcmp(dest->data, r->literal) == 0) {
2443 debug_printf("found reserved word %s, code %d\n",r->literal,r->code);
2444 if (r->flag & FLAG_START) {
2445 struct p_context *new = xmalloc(sizeof(struct p_context));
2446 debug_printf("push stack\n");
2447 if (ctx->w == RES_IN || ctx->w == RES_FOR) {
2454 *new = *ctx; /* physical copy */
2455 initialize_context(ctx);
2457 } else if ( ctx->w == RES_NONE || ! (ctx->old_flag & (1<<r->code))) {
2464 ctx->old_flag = r->flag;
2465 if (ctx->old_flag & FLAG_END) {
2466 struct p_context *old;
2467 debug_printf("pop stack\n");
2468 done_pipe(ctx,PIPE_SEQ);
2470 old->child->group = ctx->list_head;
2472 old->child->subshell = 0;
2474 *ctx = *old; /* physical copy */
2484 /* normal return is 0.
2485 * Syntax or xglob errors return 1. */
2486 static int done_word(o_string *dest, struct p_context *ctx)
2488 struct child_prog *child=ctx->child;
2490 glob_t *glob_target;
2497 debug_printf("done_word: %s %p\n", dest->data, child);
2498 if (dest->length == 0 && !dest->nonnull) {
2499 debug_printf(" true null, ignored\n");
2503 if (ctx->pending_redirect) {
2504 glob_target = &ctx->pending_redirect->word;
2509 return 1; /* syntax error, groups and arglists don't mix */
2511 if (!child->argv && (ctx->type & FLAG_PARSE_SEMICOLON)) {
2512 debug_printf("checking %s for reserved-ness\n",dest->data);
2513 if (reserved_word(dest,ctx)) return ctx->w==RES_SNTX;
2516 glob_target = &child->glob_result;
2517 if (child->argv) flags |= GLOB_APPEND;
2519 for (cnt = 1, s = dest->data; s && *s; s++) {
2520 if (*s == '\\') s++;
2525 if ( child->argv == NULL) {
2528 argc = ++child->argc;
2529 child->argv = realloc(child->argv, (argc+1)*sizeof(*child->argv));
2530 if (child->argv == NULL) return 1;
2531 child->argv[argc-1]=str;
2532 child->argv[argc]=NULL;
2533 for (s = dest->data; s && *s; s++,str++) {
2534 if (*s == '\\') s++;
2541 gr = xglob(dest, flags, glob_target);
2542 if (gr != 0) return 1;
2547 if (ctx->pending_redirect) {
2548 ctx->pending_redirect=NULL;
2549 if (glob_target->gl_pathc != 1) {
2550 error_msg("ambiguous redirect");
2554 child->argv = glob_target->gl_pathv;
2557 if (ctx->w == RES_FOR) {
2558 done_word(dest,ctx);
2559 done_pipe(ctx,PIPE_SEQ);
2564 /* The only possible error here is out of memory, in which case
2566 static int done_command(struct p_context *ctx)
2568 /* The child is really already in the pipe structure, so
2569 * advance the pipe counter and make a new, null child.
2570 * Only real trickiness here is that the uncommitted
2571 * child structure, to which ctx->child points, is not
2572 * counted in pi->num_progs. */
2573 struct pipe *pi=ctx->pipe;
2574 struct child_prog *prog=ctx->child;
2576 if (prog && prog->group == NULL
2577 && prog->argv == NULL
2579 && prog->redirects == NULL) {
2583 debug_printf("done_command: skipping null command\n");
2587 debug_printf("done_command: num_progs incremented to %d\n",pi->num_progs);
2589 debug_printf("done_command: initializing\n");
2591 pi->progs = xrealloc(pi->progs, sizeof(*pi->progs) * (pi->num_progs+1));
2593 prog = pi->progs + pi->num_progs;
2595 prog->redirects = NULL;
2599 prog->is_stopped = 0;
2603 prog->glob_result.gl_pathv = NULL;
2608 prog->type = ctx->type;
2610 /* but ctx->pipe and ctx->list_head remain unchanged */
2614 static int done_pipe(struct p_context *ctx, pipe_style type)
2617 done_command(ctx); /* implicit closure of previous command */
2618 debug_printf("done_pipe, type %d\n", type);
2619 ctx->pipe->followup = type;
2620 ctx->pipe->r_mode = ctx->w;
2622 ctx->pipe->next = new_p;
2625 done_command(ctx); /* set up new pipe to accept commands */
2630 /* peek ahead in the in_str to find out if we have a "&n" construct,
2631 * as in "2>&1", that represents duplicating a file descriptor.
2632 * returns either -2 (syntax error), -1 (no &), or the number found.
2634 static int redirect_dup_num(struct in_str *input)
2638 if (ch != '&') return -1;
2640 b_getch(input); /* get the & */
2644 return -3; /* "-" represents "close me" */
2646 while (isdigit(ch)) {
2654 error_msg("ambiguous redirect");
2658 /* If a redirect is immediately preceded by a number, that number is
2659 * supposed to tell which file descriptor to redirect. This routine
2660 * looks for such preceding numbers. In an ideal world this routine
2661 * needs to handle all the following classes of redirects...
2662 * echo 2>foo # redirects fd 2 to file "foo", nothing passed to echo
2663 * echo 49>foo # redirects fd 49 to file "foo", nothing passed to echo
2664 * echo -2>foo # redirects fd 1 to file "foo", "-2" passed to echo
2665 * echo 49x>foo # redirects fd 1 to file "foo", "49x" passed to echo
2666 * A -1 output from this program means no valid number was found, so the
2667 * caller should use the appropriate default for this redirection.
2669 static int redirect_opt_num(o_string *o)
2673 if (o->length==0) return -1;
2674 for(num=0; num<o->length; num++) {
2675 if (!isdigit(*(o->data+num))) {
2679 /* reuse num (and save an int) */
2685 FILE *generate_stream_from_list(struct pipe *head)
2689 int pid, channel[2];
2690 if (pipe(channel)<0) perror_msg_and_die("pipe");
2693 perror_msg_and_die("fork");
2694 } else if (pid==0) {
2696 if (channel[1] != 1) {
2701 #define SURROGATE "surrogate response"
2702 write(1,SURROGATE,sizeof(SURROGATE));
2703 _exit(run_list(head));
2705 _exit(run_list_real(head)); /* leaks memory */
2708 debug_printf("forked child %d\n",pid);
2710 pf = fdopen(channel[0],"r");
2711 debug_printf("pipe on FILE *%p\n",pf);
2713 free_pipe_list(head,0);
2714 pf=popen("echo surrogate response","r");
2715 debug_printf("started fake pipe on FILE *%p\n",pf);
2720 /* this version hacked for testing purposes */
2721 /* return code is exit status of the process that is run. */
2722 static int process_command_subs(o_string *dest, struct p_context *ctx, struct in_str *input, int subst_end)
2725 o_string result=NULL_O_STRING;
2726 struct p_context inner;
2728 struct in_str pipe_str;
2729 initialize_context(&inner);
2731 /* recursion to generate command */
2732 retcode = parse_stream(&result, &inner, input, subst_end);
2733 if (retcode != 0) return retcode; /* syntax error or EOF */
2734 done_word(&result, &inner);
2735 done_pipe(&inner, PIPE_SEQ);
2738 p=generate_stream_from_list(inner.list_head);
2739 if (p==NULL) return 1;
2740 mark_open(fileno(p));
2741 setup_file_in_str(&pipe_str, p);
2743 /* now send results of command back into original context */
2744 retcode = parse_stream(dest, ctx, &pipe_str, '\0');
2745 /* XXX In case of a syntax error, should we try to kill the child?
2746 * That would be tough to do right, so just read until EOF. */
2748 while (b_getch(&pipe_str)!=EOF) { /* discard */ };
2751 debug_printf("done reading from pipe, pclose()ing\n");
2752 /* This is the step that wait()s for the child. Should be pretty
2753 * safe, since we just read an EOF from its stdout. We could try
2754 * to better, by using wait(), and keeping track of background jobs
2755 * at the same time. That would be a lot of work, and contrary
2756 * to the KISS philosophy of this program. */
2757 mark_closed(fileno(p));
2759 free_pipe_list(inner.list_head,0);
2760 debug_printf("pclosed, retcode=%d\n",retcode);
2761 /* XXX this process fails to trim a single trailing newline */
2765 static int parse_group(o_string *dest, struct p_context *ctx,
2766 struct in_str *input, int ch)
2769 struct p_context sub;
2770 struct child_prog *child = ctx->child;
2773 return 1; /* syntax error, groups and arglists don't mix */
2775 initialize_context(&sub);
2777 case '(': endch=')'; child->subshell=1; break;
2778 case '{': endch='}'; break;
2779 default: syntax(); /* really logic error */
2781 rcode=parse_stream(dest,&sub,input,endch);
2782 done_word(dest,&sub); /* finish off the final word in the subcontext */
2783 done_pipe(&sub, PIPE_SEQ); /* and the final command there, too */
2784 child->group = sub.list_head;
2786 /* child remains "open", available for possible redirects */
2790 /* basically useful version until someone wants to get fancier,
2791 * see the bash man page under "Parameter Expansion" */
2792 static char *lookup_param(char *src)
2801 p = get_local_var(src);
2807 static char *get_dollar_var(char ch)
2809 static char buf[40];
2814 sprintf(buf, "%u", (unsigned int)last_return_code);
2823 /* return code: 0 for OK, 1 for syntax error */
2824 static int handle_dollar(o_string *dest, struct p_context *ctx, struct in_str *input)
2834 int ch = input->peek(input); /* first character after the $ */
2835 debug_printf("handle_dollar: ch=%c\n",ch);
2837 b_addchr(dest, SPECIAL_VAR_SYMBOL);
2839 while(ch=b_peek(input),isalnum(ch) || ch=='_') {
2843 b_addchr(dest, SPECIAL_VAR_SYMBOL);
2845 } else if (isdigit(ch)) {
2846 i = ch-'0'; /* XXX is $0 special? */
2847 if (i<global_argc) {
2848 parse_string(dest, ctx, global_argv[i]); /* recursion */
2852 } else switch (ch) {
2855 b_adduint(dest,getpid());
2859 if (last_bg_pid > 0) b_adduint(dest, last_bg_pid);
2865 b_adduint(dest,last_return_code);
2868 b_addchr(dest, SPECIAL_VAR_SYMBOL);
2869 b_addchr(dest, '$');
2870 b_addchr(dest, '?');
2871 b_addchr(dest, SPECIAL_VAR_SYMBOL);
2877 b_adduint(dest,global_argc ? global_argc-1 : 0);
2882 b_addchr(dest, SPECIAL_VAR_SYMBOL);
2885 /* XXX maybe someone will try to escape the '}' */
2886 while(ch=b_getch(input),ch!=EOF && ch!='}') {
2893 b_addchr(dest, SPECIAL_VAR_SYMBOL);
2898 process_command_subs(dest, ctx, input, ')');
2902 for (i=1; i<global_argc; i++) {
2903 parse_string(dest, ctx, global_argv[i]);
2904 if (i+1 < global_argc) parse_string(dest, ctx, sep);
2910 /* still unhandled, but should be eventually */
2911 error_msg("unhandled syntax: $%c",ch);
2916 b_addqchr(dest,'$',dest->quote);
2918 /* Eat the character if the flag was set. If the compiler
2919 * is smart enough, we could substitute "b_getch(input);"
2920 * for all the "advance = 1;" above, and also end up with
2921 * a nice size-optimized program. Hah! That'll be the day.
2923 if (advance) b_getch(input);
2928 int parse_string(o_string *dest, struct p_context *ctx, const char *src)
2931 setup_string_in_str(&foo, src);
2932 return parse_stream(dest, ctx, &foo, '\0');
2936 /* return code is 0 for normal exit, 1 for syntax error */
2937 int parse_stream(o_string *dest, struct p_context *ctx,
2938 struct in_str *input, int end_trigger)
2943 redir_type redir_style;
2947 /* Only double-quote state is handled in the state variable dest->quote.
2948 * A single-quote triggers a bypass of the main loop until its mate is
2949 * found. When recursing, quote state is passed in via dest->quote. */
2951 debug_printf("parse_stream, end_trigger=%d\n",end_trigger);
2952 while ((ch=b_getch(input))!=EOF) {
2955 if (input->__promptme == 0) return 1;
2957 next = (ch == '\n') ? 0 : b_peek(input);
2959 debug_printf("parse_stream: ch=%c (%d) m=%d quote=%d - %c\n",
2960 ch >= ' ' ? ch : '.', ch, m,
2961 dest->quote, ctx->stack == NULL ? '*' : '.');
2963 if (m==0 || ((m==1 || m==2) && dest->quote)) {
2964 b_addqchr(dest, ch, dest->quote);
2966 if (m==2) { /* unquoted IFS */
2967 if (done_word(dest, ctx)) {
2970 /* If we aren't performing a substitution, treat a newline as a
2971 * command separator. */
2972 if (end_trigger != '\0' && ch=='\n')
2973 done_pipe(ctx,PIPE_SEQ);
2975 if (ch == end_trigger && !dest->quote && ctx->w==RES_NONE) {
2976 debug_printf("leaving parse_stream (triggered)\n");
2981 /* Yahoo! Time to run with it! */
2982 done_pipe(ctx,PIPE_SEQ);
2983 run_list(ctx->list_head);
2984 initialize_context(ctx);
2987 if (m!=2) switch (ch) {
2989 if (dest->length == 0 && !dest->quote) {
2990 while(ch=b_peek(input),ch!=EOF && ch!='\n') { b_getch(input); }
2992 b_addqchr(dest, ch, dest->quote);
3000 b_addqchr(dest, '\\', dest->quote);
3001 b_addqchr(dest, b_getch(input), dest->quote);
3004 if (handle_dollar(dest, ctx, input)!=0) return 1;
3008 while(ch=b_getch(input),ch!=EOF && ch!='\'') {
3010 if(input->__promptme == 0) return 1;
3021 dest->quote = !dest->quote;
3025 process_command_subs(dest, ctx, input, '`');
3028 redir_fd = redirect_opt_num(dest);
3029 done_word(dest, ctx);
3030 redir_style=REDIRECT_OVERWRITE;
3032 redir_style=REDIRECT_APPEND;
3034 } else if (next == '(') {
3035 syntax(); /* until we support >(list) Process Substitution */
3038 setup_redirect(ctx, redir_fd, redir_style, input);
3041 redir_fd = redirect_opt_num(dest);
3042 done_word(dest, ctx);
3043 redir_style=REDIRECT_INPUT;
3045 redir_style=REDIRECT_HEREIS;
3047 } else if (next == '>') {
3048 redir_style=REDIRECT_IO;
3050 } else if (next == '(') {
3051 syntax(); /* until we support <(list) Process Substitution */
3054 setup_redirect(ctx, redir_fd, redir_style, input);
3058 done_word(dest, ctx);
3059 done_pipe(ctx,PIPE_SEQ);
3062 done_word(dest, ctx);
3065 done_pipe(ctx,PIPE_AND);
3068 done_pipe(ctx,PIPE_BG);
3076 done_word(dest, ctx);
3079 done_pipe(ctx,PIPE_OR);
3081 /* we could pick up a file descriptor choice here
3082 * with redirect_opt_num(), but bash doesn't do it.
3083 * "echo foo 2| cat" yields "foo 2". */
3095 if (parse_group(dest, ctx, input, ch)!=0) return 1;
3099 syntax(); /* Proper use of this character caught by end_trigger */
3104 syntax(); /* this is really an internal logic error */
3109 /* complain if quote? No, maybe we just finished a command substitution
3110 * that was quoted. Example:
3111 * $ echo "`cat foo` plus more"
3112 * and we just got the EOF generated by the subshell that ran "cat foo"
3113 * The only real complaint is if we got an EOF when end_trigger != '\0',
3114 * that is, we were really supposed to get end_trigger, and never got
3115 * one before the EOF. Can't use the standard "syntax error" return code,
3116 * so that parse_stream_outer can distinguish the EOF and exit smoothly. */
3117 debug_printf("leaving parse_stream (EOF)\n");
3118 if (end_trigger != '\0') return -1;
3122 void mapset(const unsigned char *set, int code)
3124 const unsigned char *s;
3125 for (s=set; *s; s++) map[*s] = code;
3128 void update_ifs_map(void)
3130 /* char *ifs and char map[256] are both globals. */
3131 ifs = (uchar *)getenv("IFS");
3132 if (ifs == NULL) ifs=(uchar *)" \t\n";
3133 /* Precompute a list of 'flow through' behavior so it can be treated
3134 * quickly up front. Computation is necessary because of IFS.
3135 * Special case handling of IFS == " \t\n" is not implemented.
3136 * The map[] array only really needs two bits each, and on most machines
3137 * that would be faster because of the reduced L1 cache footprint.
3139 memset(map,0,sizeof(map)); /* most characters flow through always */
3141 mapset((uchar *)"\\$'\"`", 3); /* never flow through */
3142 mapset((uchar *)"<>;&|(){}#", 1); /* flow through if quoted */
3144 mapset((uchar *)"\\$'\"", 3); /* never flow through */
3145 mapset((uchar *)";&|#", 1); /* flow through if quoted */
3147 mapset(ifs, 2); /* also flow through if quoted */
3150 /* most recursion does not come through here, the exeception is
3151 * from builtin_source() */
3152 int parse_stream_outer(struct in_str *inp, int flag)
3155 struct p_context ctx;
3156 o_string temp=NULL_O_STRING;
3163 initialize_context(&ctx);
3165 if (!(flag & FLAG_PARSE_SEMICOLON) || (flag & FLAG_REPARSING)) mapset((uchar *)";$&|", 0);
3167 rcode = parse_stream(&temp, &ctx, inp, '\n');
3169 if (rcode == 1) flag_repeat = 0;
3171 if (rcode != 1 && ctx.old_flag != 0) {
3177 if (rcode != 1 && ctx.old_flag == 0) {
3178 done_word(&temp, &ctx);
3179 done_pipe(&ctx,PIPE_SEQ);
3181 run_list(ctx.list_head);
3183 code = run_list(ctx.list_head);
3184 if (code == -2) { /* exit */
3187 /* XXX hackish way to not allow exit from main loop */
3188 if (inp->peek == file_peek) {
3189 printf("exit not allowed from main input shell.\n");
3198 if (ctx.old_flag != 0) {
3203 if (inp->__promptme == 0) printf("<INTERRUPT>\n");
3204 inp->__promptme = 1;
3209 free_pipe_list(ctx.list_head,0);
3212 } while (rcode != -1 && !(flag & FLAG_EXIT_FROM_LOOP)); /* loop on syntax errors, return on EOF */
3216 return (code != 0) ? 1 : 0;
3217 #endif /* __U_BOOT__ */
3221 static int parse_string_outer(const char *s, int flag)
3223 int parse_string_outer(char *s, int flag)
3224 #endif /* __U_BOOT__ */
3226 struct in_str input;
3232 if (!(p = strchr(s, '\n')) || *++p) {
3233 p = xmalloc(strlen(s) + 2);
3236 setup_string_in_str(&input, p);
3237 rcode = parse_stream_outer(&input, flag);
3242 setup_string_in_str(&input, s);
3243 return parse_stream_outer(&input, flag);
3250 static int parse_file_outer(FILE *f)
3252 int parse_file_outer(void)
3256 struct in_str input;
3258 setup_file_in_str(&input, f);
3260 setup_file_in_str(&input);
3262 rcode = parse_stream_outer(&input, FLAG_PARSE_SEMICOLON);
3267 #ifdef CONFIG_NEEDS_MANUAL_RELOC
3268 static void u_boot_hush_reloc(void)
3271 struct reserved_combo *r;
3273 for (r=reserved_list; r<reserved_list+NRES; r++) {
3274 addr = (ulong) (r->literal) + gd->reloc_off;
3275 r->literal = (char *)addr;
3280 int u_boot_hush_start(void)
3282 if (top_vars == NULL) {
3283 top_vars = malloc(sizeof(struct variables));
3284 top_vars->name = "HUSH_VERSION";
3285 top_vars->value = "0.01";
3287 top_vars->flg_export = 0;
3288 top_vars->flg_read_only = 1;
3289 #ifdef CONFIG_NEEDS_MANUAL_RELOC
3290 u_boot_hush_reloc();
3296 static void *xmalloc(size_t size)
3300 if (!(p = malloc(size))) {
3301 printf("ERROR : memory not allocated\n");
3307 static void *xrealloc(void *ptr, size_t size)
3311 if (!(p = realloc(ptr, size))) {
3312 printf("ERROR : memory not allocated\n");
3317 #endif /* __U_BOOT__ */
3320 /* Make sure we have a controlling tty. If we get started under a job
3321 * aware app (like bash for example), make sure we are now in charge so
3322 * we don't fight over who gets the foreground */
3323 static void setup_job_control(void)
3325 static pid_t shell_pgrp;
3326 /* Loop until we are in the foreground. */
3327 while (tcgetpgrp (shell_terminal) != (shell_pgrp = getpgrp ()))
3328 kill (- shell_pgrp, SIGTTIN);
3330 /* Ignore interactive and job-control signals. */
3331 signal(SIGINT, SIG_IGN);
3332 signal(SIGQUIT, SIG_IGN);
3333 signal(SIGTERM, SIG_IGN);
3334 signal(SIGTSTP, SIG_IGN);
3335 signal(SIGTTIN, SIG_IGN);
3336 signal(SIGTTOU, SIG_IGN);
3337 signal(SIGCHLD, SIG_IGN);
3339 /* Put ourselves in our own process group. */
3341 shell_pgrp = getpid ();
3342 setpgid (shell_pgrp, shell_pgrp);
3344 /* Grab control of the terminal. */
3345 tcsetpgrp(shell_terminal, shell_pgrp);
3348 int hush_main(int argc, char * const *argv)
3354 /* XXX what should these be while sourcing /etc/profile? */
3358 /* (re?) initialize globals. Sometimes hush_main() ends up calling
3359 * hush_main(), therefore we cannot rely on the BSS to zero out this
3360 * stuff. Reset these to 0 every time. */
3362 /* map[] is taken care of with call to update_ifs_map() */
3365 close_me_head = NULL;
3370 /* Initialize some more globals to non-zero values */
3372 #ifdef CONFIG_FEATURE_COMMAND_EDITING
3373 cmdedit_set_initial_prompt();
3379 /* initialize our shell local variables with the values
3380 * currently living in the environment */
3383 set_local_var(*e, 2); /* without call putenv() */
3386 last_return_code=EXIT_SUCCESS;
3389 if (argv[0] && argv[0][0] == '-') {
3390 debug_printf("\nsourcing /etc/profile\n");
3391 if ((input = fopen("/etc/profile", "r")) != NULL) {
3392 mark_open(fileno(input));
3393 parse_file_outer(input);
3394 mark_closed(fileno(input));
3400 while ((opt = getopt(argc, argv, "c:xif")) > 0) {
3404 global_argv = argv+optind;
3405 global_argc = argc-optind;
3406 opt = parse_string_outer(optarg, FLAG_PARSE_SEMICOLON);
3418 fprintf(stderr, "Usage: sh [FILE]...\n"
3419 " or: sh -c command [args]...\n\n");
3426 /* A shell is interactive if the `-i' flag was given, or if all of
3427 * the following conditions are met:
3429 * no arguments remaining or the -s flag given
3430 * standard input is a terminal
3431 * standard output is a terminal
3432 * Refer to Posix.2, the description of the `sh' utility. */
3433 if (argv[optind]==NULL && input==stdin &&
3434 isatty(fileno(stdin)) && isatty(fileno(stdout))) {
3438 debug_printf("\ninteractive=%d\n", interactive);
3440 /* Looks like they want an interactive shell */
3441 #ifndef CONFIG_FEATURE_SH_EXTRA_QUIET
3442 printf( "\n\n" BB_BANNER " hush - the humble shell v0.01 (testing)\n");
3443 printf( "Enter 'help' for a list of built-in commands.\n\n");
3445 setup_job_control();
3448 if (argv[optind]==NULL) {
3449 opt=parse_file_outer(stdin);
3453 debug_printf("\nrunning script '%s'\n", argv[optind]);
3454 global_argv = argv+optind;
3455 global_argc = argc-optind;
3456 input = xfopen(argv[optind], "r");
3457 opt = parse_file_outer(input);
3459 #ifdef CONFIG_FEATURE_CLEAN_UP
3461 if (cwd && cwd != unknown)
3464 struct variables *cur, *tmp;
3465 for(cur = top_vars; cur; cur = tmp) {
3467 if (!cur->flg_read_only) {
3477 return(opt?opt:last_return_code);
3481 static char *insert_var_value(char *inp)
3483 int res_str_len = 0;
3486 char *p, *p1, *res_str = NULL;
3488 while ((p = strchr(inp, SPECIAL_VAR_SYMBOL))) {
3491 res_str = xrealloc(res_str, (res_str_len + len));
3492 strncpy((res_str + res_str_len), inp, len);
3496 p = strchr(inp, SPECIAL_VAR_SYMBOL);
3498 if ((p1 = lookup_param(inp))) {
3499 len = res_str_len + strlen(p1);
3500 res_str = xrealloc(res_str, (1 + len));
3501 strcpy((res_str + res_str_len), p1);
3504 *p = SPECIAL_VAR_SYMBOL;
3509 res_str = xrealloc(res_str, (1 + res_str_len + strlen(inp)));
3510 strcpy((res_str + res_str_len), inp);
3511 while ((p = strchr(res_str, '\n'))) {
3515 return (res_str == NULL) ? inp : res_str;
3518 static char **make_list_in(char **inp, char *name)
3521 int name_len = strlen(name);
3526 /* create list of variable values */
3527 list = xmalloc(sizeof(*list));
3528 for (i = 0; inp[i]; i++) {
3529 p3 = insert_var_value(inp[i]);
3536 if ((p2 = strchr(p1, ' '))) {
3542 /* we use n + 2 in realloc for list,because we add
3543 * new element and then we will add NULL element */
3544 list = xrealloc(list, sizeof(*list) * (n + 2));
3545 list[n] = xmalloc(2 + name_len + len);
3546 strcpy(list[n], name);
3547 strcat(list[n], "=");
3548 strncat(list[n], p1, len);
3549 list[n++][name_len + len + 1] = '\0';
3552 if (p3 != inp[i]) free(p3);
3558 /* Make new string for parser */
3559 static char * make_string(char ** inp)
3566 for (n = 0; inp[n]; n++) {
3567 p = insert_var_value(inp[n]);
3568 str = xrealloc(str, (len + strlen(p)));
3575 len = strlen(str) + 3;
3576 if (p != inp[n]) free(p);
3579 *(str + len) = '\n';
3580 *(str + len + 1) = '\0';
3585 int do_showvar (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
3589 struct variables *cur;
3591 if (argc == 1) { /* Print all env variables */
3592 for (cur = top_vars; cur; cur = cur->next) {
3593 printf ("%s=%s\n", cur->name, cur->value);
3595 puts ("\n ** Abort\n");
3601 for (i = 1; i < argc; ++i) { /* print single env variables */
3602 char *name = argv[i];
3605 for (cur = top_vars; cur; cur = cur->next) {
3606 if(strcmp (cur->name, name) == 0) {
3608 printf ("%s=%s\n", cur->name, cur->value);
3611 puts ("\n ** Abort\n");
3616 printf ("## Error: \"%s\" not defined\n", name);
3624 showvar, CONFIG_SYS_MAXARGS, 1, do_showvar,
3625 "print local hushshell variables",
3626 "\n - print values of all hushshell variables\n"
3627 "showvar name ...\n"
3628 " - print value of hushshell variable 'name'"
3632 /****************************************************************************/