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 * b_addchr() derived from similar w_addchar function in glibc-2.2
21 * setup_redirect(), redirect_opt_num(), and big chunks of main()
22 * and many builtins derived from contributions by Erik Andersen
23 * miscellaneous bugfixes from Matt Kraai
25 * There are two big (and related) architecture differences between
26 * this parser and the lash parser. One is that this version is
27 * actually designed from the ground up to understand nearly all
28 * of the Bourne grammar. The second, consequential change is that
29 * the parser and input reader have been turned inside out. Now,
30 * the parser is in control, and asks for input as needed. The old
31 * way had the input reader in control, and it asked for parsing to
32 * take place as needed. The new way makes it much easier to properly
33 * handle the recursion implicit in the various substitutions, especially
34 * across continuation lines.
36 * Bash grammar not implemented: (how many of these were in original sh?)
37 * $@ (those sure look like weird quoting rules)
39 * ! negation operator for pipes
40 * &> and >& redirection of stdout+stderr
43 * fancy forms of Parameter Expansion
45 * Arithmetic Expansion
46 * <(list) and >(list) Process Substitution
47 * reserved words: case, esac, select, function
48 * Here Documents ( << word )
51 * job handling woefully incomplete and buggy
52 * reserved word execution woefully incomplete and buggy
54 * port selected bugfixes from post-0.49 busybox lash - done?
55 * finish implementing reserved words: for, while, until, do, done
56 * change { and } from special chars to reserved words
57 * builtins: break, continue, eval, return, set, trap, ulimit
59 * handle children going into background
60 * clean up recognition of null pipes
61 * check setting of global_argc and global_argv
62 * control-C handling, probably with longjmp
63 * follow IFS rules more precisely, including update semantics
64 * figure out what to do with backslash-newline
65 * explain why we use signal instead of sigaction
66 * propagate syntax errors, die on resource errors?
67 * continuation lines, both explicit and implicit - done?
68 * memory leak finding and plugging - done?
69 * more testing, especially quoting rules and redirection
70 * document how quoting rules not precisely followed for variable assignments
71 * maybe change map[] to use 2-bit entries
72 * (eventually) remove all the printf's
74 * SPDX-License-Identifier: GPL-2.0+
79 #include <malloc.h> /* malloc, free, realloc*/
80 #include <linux/ctype.h> /* isalpha, isdigit */
81 #include <common.h> /* readline */
83 #include <bootretry.h>
86 #include <command.h> /* find_cmd */
87 #ifndef CONFIG_SYS_PROMPT_HUSH_PS2
88 #define CONFIG_SYS_PROMPT_HUSH_PS2 "> "
92 #include <ctype.h> /* isalpha, isdigit */
93 #include <unistd.h> /* getpid */
94 #include <stdlib.h> /* getenv, atoi */
95 #include <string.h> /* strchr */
96 #include <stdio.h> /* popen etc. */
97 #include <glob.h> /* glob, of course */
98 #include <stdarg.h> /* va_list */
101 #include <getopt.h> /* should be pretty obvious */
103 #include <sys/stat.h> /* ulimit */
104 #include <sys/types.h>
105 #include <sys/wait.h>
108 /* #include <dmalloc.h> */
114 #define applet_name "hush"
115 #include "standalone.h"
116 #define hush_main main
117 #undef CONFIG_FEATURE_SH_FANCY_PROMPT
121 #define SPECIAL_VAR_SYMBOL 03
122 #define SUBSTED_VAR_SYMBOL 04
124 #define FLAG_EXIT_FROM_LOOP 1
125 #define FLAG_PARSE_SEMICOLON (1 << 1) /* symbol ';' is special for parser */
126 #define FLAG_REPARSING (1 << 2) /* >= 2nd pass */
131 DECLARE_GLOBAL_DATA_PTR;
133 #define EXIT_SUCCESS 0
135 #define syntax() syntax_err()
136 #define xstrdup strdup
137 #define error_msg printf
141 REDIRECT_OVERWRITE = 2,
147 /* The descrip member of this structure is only used to make debugging
149 struct {int mode; int default_fd; char *descrip;} redir_table[] = {
151 { O_RDONLY, 0, "<" },
152 { O_CREAT|O_TRUNC|O_WRONLY, 1, ">" },
153 { O_CREAT|O_APPEND|O_WRONLY, 1, ">>" },
154 { O_RDONLY, -1, "<<" },
166 /* might eventually control execution */
183 #define FLAG_END (1<<RES_NONE)
184 #define FLAG_IF (1<<RES_IF)
185 #define FLAG_THEN (1<<RES_THEN)
186 #define FLAG_ELIF (1<<RES_ELIF)
187 #define FLAG_ELSE (1<<RES_ELSE)
188 #define FLAG_FI (1<<RES_FI)
189 #define FLAG_FOR (1<<RES_FOR)
190 #define FLAG_WHILE (1<<RES_WHILE)
191 #define FLAG_UNTIL (1<<RES_UNTIL)
192 #define FLAG_DO (1<<RES_DO)
193 #define FLAG_DONE (1<<RES_DONE)
194 #define FLAG_IN (1<<RES_IN)
195 #define FLAG_START (1<<RES_XXXX)
197 /* This holds pointers to the various results of parsing */
199 struct child_prog *child;
200 struct pipe *list_head;
203 struct redir_struct *pending_redirect;
206 int old_flag; /* for figuring out valid reserved words */
207 struct p_context *stack;
208 int type; /* define type of parser : ";$" common or special symbol */
209 /* How about quoting status? */
213 struct redir_struct {
214 redir_type type; /* type of redirection */
215 int fd; /* file descriptor being redirected */
216 int dup; /* -1, or file descriptor being duplicated */
217 struct redir_struct *next; /* pointer to the next redirect in the list */
218 glob_t word; /* *word.gl_pathv is the filename */
224 pid_t pid; /* 0 if exited */
226 char **argv; /* program name and arguments */
227 /* was quoted when parsed; copy of struct o_string.nonnull field */
230 int argc; /* number of program arguments */
232 struct pipe *group; /* if non-NULL, first in group or subshell */
234 int subshell; /* flag, non-zero if group must be forked */
235 struct redir_struct *redirects; /* I/O redirections */
236 glob_t glob_result; /* result of parameter globbing */
237 int is_stopped; /* is the program currently running? */
238 struct pipe *family; /* pointer back to the child's parent pipe */
240 int sp; /* number of SPECIAL_VAR_SYMBOL */
246 int jobid; /* job number */
248 int num_progs; /* total number of programs in job */
250 int running_progs; /* number of programs running */
251 char *text; /* name of job */
252 char *cmdbuf; /* buffer various argv's point into */
253 pid_t pgrp; /* process group ID for the job */
255 struct child_prog *progs; /* array of commands in pipe */
256 struct pipe *next; /* to track background commands */
258 int stopped_progs; /* number of programs alive, but stopped */
259 int job_context; /* bitmask defining current context */
261 pipe_style followup; /* PIPE_BG, PIPE_SEQ, PIPE_OR, PIPE_AND */
262 reserved_style r_mode; /* supports if, for, while, until */
268 struct close_me *next;
277 struct variables *next;
280 /* globals, connect us to the outside world
281 * the first three support $?, $#, and $1 */
284 unsigned int global_argc;
286 static unsigned int last_return_code;
288 extern char **environ; /* This is in <unistd.h>, but protected with __USE_GNU */
291 /* "globals" within this file */
293 static char map[256];
295 static int fake_mode;
296 static int interactive;
297 static struct close_me *close_me_head;
298 static const char *cwd;
299 static struct pipe *job_list;
300 static unsigned int last_bg_pid;
301 static unsigned int last_jobid;
302 static unsigned int shell_terminal;
305 struct variables shell_ver = { "HUSH_VERSION", "0.01", 1, 1, 0 };
306 struct variables *top_vars = &shell_ver;
308 static int flag_repeat = 0;
309 static int do_repeat = 0;
310 static struct variables *top_vars = NULL ;
311 #endif /*__U_BOOT__ */
313 #define B_CHUNK (100)
323 #define NULL_O_STRING {NULL,0,0,0,0}
324 /* used for initialization:
325 o_string foo = NULL_O_STRING; */
327 /* I can almost use ordinary FILE *. Is open_memstream() universally
328 * available? Where is it documented? */
339 int (*get) (struct in_str *);
340 int (*peek) (struct in_str *);
342 #define b_getch(input) ((input)->get(input))
343 #define b_peek(input) ((input)->peek(input))
346 #define JOB_STATUS_FORMAT "[%d] %-22s %.40s\n"
348 struct built_in_command {
349 char *cmd; /* name */
350 char *descr; /* description */
351 int (*function) (struct child_prog *); /* function ptr */
355 /* define DEBUG_SHELL for debugging output (obviously ;-)) */
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(fmt,args...) printf (fmt ,##args)
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);
419 static int b_adduint(o_string *o, unsigned int i);
421 /* in_str manipulations: */
422 static int static_get(struct in_str *i);
423 static int static_peek(struct in_str *i);
424 static int file_get(struct in_str *i);
425 static int file_peek(struct in_str *i);
427 static void setup_file_in_str(struct in_str *i, FILE *f);
429 static void setup_file_in_str(struct in_str *i);
431 static void setup_string_in_str(struct in_str *i, const char *s);
433 /* close_me manipulations: */
434 static void mark_open(int fd);
435 static void mark_closed(int fd);
436 static void close_all(void);
438 /* "run" the final data structures: */
439 static char *indenter(int i);
440 static int free_pipe_list(struct pipe *head, int indent);
441 static int free_pipe(struct pipe *pi, int indent);
442 /* really run the final data structures: */
444 static int setup_redirects(struct child_prog *prog, int squirrel[]);
446 static int run_list_real(struct pipe *pi);
448 static void pseudo_exec(struct child_prog *child) __attribute__ ((noreturn));
450 static int run_pipe_real(struct pipe *pi);
451 /* extended glob support: */
453 static int globhack(const char *src, int flags, glob_t *pglob);
454 static int glob_needed(const char *s);
455 static int xglob(o_string *dest, int flags, glob_t *pglob);
457 /* variable assignment: */
458 static int is_assignment(const char *s);
459 /* data structure manipulation: */
461 static int setup_redirect(struct p_context *ctx, int fd, redir_type style, struct in_str *input);
463 static void initialize_context(struct p_context *ctx);
464 static int done_word(o_string *dest, struct p_context *ctx);
465 static int done_command(struct p_context *ctx);
466 static int done_pipe(struct p_context *ctx, pipe_style type);
467 /* primary string parsing: */
469 static int redirect_dup_num(struct in_str *input);
470 static int redirect_opt_num(o_string *o);
471 static int process_command_subs(o_string *dest, struct p_context *ctx, struct in_str *input, int subst_end);
472 static int parse_group(o_string *dest, struct p_context *ctx, struct in_str *input, int ch);
474 static char *lookup_param(char *src);
475 static char *make_string(char **inp, int *nonnull);
476 static int handle_dollar(o_string *dest, struct p_context *ctx, struct in_str *input);
478 static int parse_string(o_string *dest, struct p_context *ctx, const char *src);
480 static int parse_stream(o_string *dest, struct p_context *ctx, struct in_str *input0, int end_trigger);
482 static int parse_stream_outer(struct in_str *inp, int flag);
484 static int parse_string_outer(const char *s, int flag);
485 static int parse_file_outer(FILE *f);
488 /* job management: */
489 static int checkjobs(struct pipe* fg_pipe);
490 static void insert_bg_job(struct pipe *pi);
491 static void remove_bg_job(struct pipe *pi);
493 /* local variable support */
494 static char **make_list_in(char **inp, char *name);
495 static char *insert_var_value(char *inp);
496 static char *insert_var_value_sub(char *inp, int tag_subst);
499 /* Table of built-in functions. They can be forked or not, depending on
500 * context: within pipes, they fork. As simple commands, they do not.
501 * When used in non-forking context, they can change global variables
502 * in the parent shell process. If forked, of course they can not.
503 * For example, 'unset foo | whatever' will parse and run, but foo will
504 * still be set at the end. */
505 static struct built_in_command bltins[] = {
506 {"bg", "Resume a job in the background", builtin_fg_bg},
507 {"break", "Exit for, while or until loop", builtin_not_written},
508 {"cd", "Change working directory", builtin_cd},
509 {"continue", "Continue for, while or until loop", builtin_not_written},
510 {"env", "Print all environment variables", builtin_env},
511 {"eval", "Construct and run shell command", builtin_eval},
512 {"exec", "Exec command, replacing this shell with the exec'd process",
514 {"exit", "Exit from shell()", builtin_exit},
515 {"export", "Set environment variable", builtin_export},
516 {"fg", "Bring job into the foreground", builtin_fg_bg},
517 {"jobs", "Lists the active jobs", builtin_jobs},
518 {"pwd", "Print current directory", builtin_pwd},
519 {"read", "Input environment variable", builtin_read},
520 {"return", "Return from a function", builtin_not_written},
521 {"set", "Set/unset shell local variables", builtin_set},
522 {"shift", "Shift positional parameters", builtin_shift},
523 {"trap", "Trap signals", builtin_not_written},
524 {"ulimit","Controls resource limits", builtin_not_written},
525 {"umask","Sets file creation mask", builtin_umask},
526 {"unset", "Unset environment variable", builtin_unset},
527 {".", "Source-in and run commands in a file", builtin_source},
528 {"help", "List shell built-in commands", builtin_help},
532 static const char *set_cwd(void)
535 cwd = NULL; /* xgetcwd(arg) called free(arg) */
536 cwd = xgetcwd((char *)cwd);
542 /* built-in 'eval' handler */
543 static int builtin_eval(struct child_prog *child)
546 int rcode = EXIT_SUCCESS;
548 if (child->argv[1]) {
549 str = make_string(child->argv + 1);
550 parse_string_outer(str, FLAG_EXIT_FROM_LOOP |
551 FLAG_PARSE_SEMICOLON);
553 rcode = last_return_code;
558 /* built-in 'cd <path>' handler */
559 static int builtin_cd(struct child_prog *child)
562 if (child->argv[1] == NULL)
563 newdir = env_get("HOME");
565 newdir = child->argv[1];
567 printf("cd: %s: %s\n", newdir, strerror(errno));
574 /* built-in 'env' handler */
575 static int builtin_env(struct child_prog *dummy)
578 if (e == NULL) return EXIT_FAILURE;
585 /* built-in 'exec' handler */
586 static int builtin_exec(struct child_prog *child)
588 if (child->argv[1] == NULL)
589 return EXIT_SUCCESS; /* Really? */
595 /* built-in 'exit' handler */
596 static int builtin_exit(struct child_prog *child)
598 if (child->argv[1] == NULL)
599 exit(last_return_code);
600 exit (atoi(child->argv[1]));
603 /* built-in 'export VAR=value' handler */
604 static int builtin_export(struct child_prog *child)
607 char *name = child->argv[1];
610 return (builtin_env(child));
616 char *value = strchr(name, '=');
620 /* They are exporting something without an =VALUE */
622 value = get_local_var(name);
624 size_t ln = strlen(name);
626 tmp = realloc(name, ln+strlen(value)+2);
630 sprintf(tmp+ln, "=%s", value);
634 /* bash does not return an error when trying to export
635 * an undefined variable. Do likewise. */
641 perror_msg("export");
643 res = set_local_var(name, 1);
650 /* built-in 'fg' and 'bg' handler */
651 static int builtin_fg_bg(struct child_prog *child)
654 struct pipe *pi=NULL;
658 /* If they gave us no args, assume they want the last backgrounded task */
659 if (!child->argv[1]) {
660 for (pi = job_list; pi; pi = pi->next) {
661 if (pi->jobid == last_jobid) {
666 error_msg("%s: no current job", child->argv[0]);
670 if (sscanf(child->argv[1], "%%%d", &jobnum) != 1) {
671 error_msg("%s: bad argument '%s'", child->argv[0], child->argv[1]);
674 for (pi = job_list; pi; pi = pi->next) {
675 if (pi->jobid == jobnum) {
680 error_msg("%s: %d: no such job", child->argv[0], jobnum);
685 if (*child->argv[0] == 'f') {
686 /* Put the job into the foreground. */
687 tcsetpgrp(shell_terminal, pi->pgrp);
690 /* Restart the processes in the job */
691 for (i = 0; i < pi->num_progs; i++)
692 pi->progs[i].is_stopped = 0;
694 if ( (i=kill(- pi->pgrp, SIGCONT)) < 0) {
698 perror_msg("kill (SIGCONT)");
702 pi->stopped_progs = 0;
706 /* built-in 'help' handler */
707 static int builtin_help(struct child_prog *dummy)
709 struct built_in_command *x;
711 printf("\nBuilt-in commands:\n");
712 printf("-------------------\n");
713 for (x = bltins; x->cmd; x++) {
716 printf("%s\t%s\n", x->cmd, x->descr);
722 /* built-in 'jobs' handler */
723 static int builtin_jobs(struct child_prog *child)
728 for (job = job_list; job; job = job->next) {
729 if (job->running_progs == job->stopped_progs)
730 status_string = "Stopped";
732 status_string = "Running";
734 printf(JOB_STATUS_FORMAT, job->jobid, status_string, job->text);
740 /* built-in 'pwd' handler */
741 static int builtin_pwd(struct child_prog *dummy)
747 /* built-in 'read VAR' handler */
748 static int builtin_read(struct child_prog *child)
752 if (child->argv[1]) {
756 string[0] = 0; /* In case stdin has only EOF */
758 fgets(string, sizeof(string), stdin);
760 var = malloc(strlen(child->argv[1])+strlen(string)+2);
762 sprintf(var, "%s=%s", child->argv[1], string);
763 res = set_local_var(var, 0);
767 fprintf(stderr, "read: %m\n");
768 free(var); /* So not move up to avoid breaking errno */
771 do res=getchar(); while(res!='\n' && res!=EOF);
776 /* built-in 'set VAR=value' handler */
777 static int builtin_set(struct child_prog *child)
779 char *temp = child->argv[1];
783 for(e = top_vars; e; e=e->next)
784 printf("%s=%s\n", e->name, e->value);
786 set_local_var(temp, 0);
792 /* Built-in 'shift' handler */
793 static int builtin_shift(struct child_prog *child)
796 if (child->argv[1]) {
797 n=atoi(child->argv[1]);
799 if (n>=0 && n<global_argc) {
800 /* XXX This probably breaks $0 */
809 /* Built-in '.' handler (read-in and execute commands from file) */
810 static int builtin_source(struct child_prog *child)
815 if (child->argv[1] == NULL)
818 /* XXX search through $PATH is missing */
819 input = fopen(child->argv[1], "r");
821 error_msg("Couldn't open file '%s'", child->argv[1]);
825 /* Now run the file */
826 /* XXX argv and argc are broken; need to save old global_argv
827 * (pointer only is OK!) on this stack frame,
828 * set global_argv=child->argv+1, recurse, and restore. */
829 mark_open(fileno(input));
830 status = parse_file_outer(input);
831 mark_closed(fileno(input));
836 static int builtin_umask(struct child_prog *child)
839 const char *arg = child->argv[1];
842 new_umask=strtoul(arg, &end, 8);
843 if (*end!='\0' || end == arg) {
847 printf("%.3o\n", (unsigned int) (new_umask=umask(0)));
853 /* built-in 'unset VAR' handler */
854 static int builtin_unset(struct child_prog *child)
856 /* bash returned already true */
857 unset_local_var(child->argv[1]);
861 static int builtin_not_written(struct child_prog *child)
863 printf("builtin_%s not written\n",child->argv[0]);
868 static int b_check_space(o_string *o, int len)
870 /* It would be easy to drop a more restrictive policy
871 * in here, such as setting a maximum string length */
872 if (o->length + len > o->maxlen) {
873 char *old_data = o->data;
874 /* assert (data == NULL || o->maxlen != 0); */
875 o->maxlen += max(2*len, B_CHUNK);
876 o->data = realloc(o->data, 1 + o->maxlen);
877 if (o->data == NULL) {
881 return o->data == NULL;
884 static int b_addchr(o_string *o, int ch)
886 debug_printf("b_addchr: %c %d %p\n", ch, o->length, o);
887 if (b_check_space(o, 1)) return B_NOSPAC;
888 o->data[o->length] = ch;
890 o->data[o->length] = '\0';
894 static void b_reset(o_string *o)
898 if (o->data != NULL) *o->data = '\0';
901 static void b_free(o_string *o)
909 /* My analysis of quoting semantics tells me that state information
910 * is associated with a destination, not a source.
912 static int b_addqchr(o_string *o, int ch, int quote)
914 if (quote && strchr("*?[\\",ch)) {
916 rc = b_addchr(o, '\\');
919 return b_addchr(o, ch);
923 static int b_adduint(o_string *o, unsigned int i)
926 char *p = simple_itoa(i);
927 /* no escape checking necessary */
928 do r=b_addchr(o, *p++); while (r==0 && *p);
933 static int static_get(struct in_str *i)
936 if (ch=='\0') return EOF;
940 static int static_peek(struct in_str *i)
946 static inline void cmdedit_set_initial_prompt(void)
948 #ifndef CONFIG_FEATURE_SH_FANCY_PROMPT
951 PS1 = env_get("PS1");
957 static inline void setup_prompt_string(int promptmode, char **prompt_str)
959 debug_printf("setup_prompt_string %d ",promptmode);
960 #ifndef CONFIG_FEATURE_SH_FANCY_PROMPT
961 /* Set up the prompt */
962 if (promptmode == 1) {
964 PS1=xmalloc(strlen(cwd)+4);
965 sprintf(PS1, "%s %s", cwd, ( geteuid() != 0 ) ? "$ ":"# ");
971 *prompt_str = (promptmode==1)? PS1 : PS2;
973 debug_printf("result %s\n",*prompt_str);
978 static int uboot_cli_readline(struct in_str *i)
981 char __maybe_unused *ps_prompt = NULL;
983 if (i->promptmode == 1)
984 prompt = CONFIG_SYS_PROMPT;
986 prompt = CONFIG_SYS_PROMPT_HUSH_PS2;
988 #ifdef CONFIG_CMDLINE_PS_SUPPORT
989 if (i->promptmode == 1)
990 ps_prompt = env_get("PS1");
992 ps_prompt = env_get("PS2");
997 return cli_readline(prompt);
1001 static void get_user_input(struct in_str *i)
1005 static char the_command[BUFSIZ];
1007 setup_prompt_string(i->promptmode, &prompt_str);
1008 #ifdef CONFIG_FEATURE_COMMAND_EDITING
1010 ** enable command line editing only while a command line
1011 ** is actually being read; otherwise, we'll end up bequeathing
1012 ** atexit() handlers and other unwanted stuff to our
1013 ** child processes (rob@sysgo.de)
1015 cmdedit_read_input(prompt_str, the_command);
1017 fputs(prompt_str, stdout);
1019 the_command[0]=fgetc(i->file);
1020 the_command[1]='\0';
1026 static char the_command[CONFIG_SYS_CBSIZE + 1];
1028 bootretry_reset_cmd_timeout();
1030 n = uboot_cli_readline(i);
1032 #ifdef CONFIG_BOOT_RETRY_TIME
1034 puts("\nTimeout waiting for command\n");
1035 # ifdef CONFIG_RESET_TO_RETRY
1036 do_reset(NULL, 0, 0, NULL);
1038 # error "This currently only works with CONFIG_RESET_TO_RETRY enabled"
1046 n = strlen(console_buffer);
1047 console_buffer[n] = '\n';
1048 console_buffer[n+1]= '\0';
1049 if (had_ctrlc()) flag_repeat = 0;
1052 if (i->promptmode == 1) {
1053 if (console_buffer[0] == '\n'&& flag_repeat == 0) {
1054 strcpy(the_command,console_buffer);
1057 if (console_buffer[0] != '\n') {
1058 strcpy(the_command,console_buffer);
1068 if (console_buffer[0] != '\n') {
1069 if (strlen(the_command) + strlen(console_buffer)
1070 < CONFIG_SYS_CBSIZE) {
1071 n = strlen(the_command);
1072 the_command[n-1] = ' ';
1073 strcpy(&the_command[n],console_buffer);
1076 the_command[0] = '\n';
1077 the_command[1] = '\0';
1081 if (i->__promptme == 0) {
1082 the_command[0] = '\n';
1083 the_command[1] = '\0';
1085 i->p = console_buffer;
1090 /* This is the magic location that prints prompts
1091 * and gets data back from the user */
1092 static int file_get(struct in_str *i)
1097 /* If there is data waiting, eat it up */
1098 if (i->p && *i->p) {
1101 /* need to double check i->file because we might be doing something
1102 * more complicated by now, like sourcing or substituting. */
1104 if (i->__promptme && interactive && i->file == stdin) {
1105 while(! i->p || (interactive && strlen(i->p)==0) ) {
1107 while(! i->p || strlen(i->p)==0 ) {
1115 if (i->p && *i->p) {
1120 ch = fgetc(i->file);
1124 debug_printf("b_getch: got a %d\n", ch);
1127 if (ch == '\n') i->__promptme=1;
1132 /* All the callers guarantee this routine will never be
1133 * used right after a newline, so prompting is not needed.
1135 static int file_peek(struct in_str *i)
1138 if (i->p && *i->p) {
1143 i->peek_buf[0] = fgetc(i->file);
1144 i->peek_buf[1] = '\0';
1146 debug_printf("b_peek: got a %d\n", *i->p);
1153 static void setup_file_in_str(struct in_str *i, FILE *f)
1155 static void setup_file_in_str(struct in_str *i)
1158 i->peek = file_peek;
1168 static void setup_string_in_str(struct in_str *i, const char *s)
1170 i->peek = static_peek;
1171 i->get = static_get;
1178 static void mark_open(int fd)
1180 struct close_me *new = xmalloc(sizeof(struct close_me));
1182 new->next = close_me_head;
1183 close_me_head = new;
1186 static void mark_closed(int fd)
1188 struct close_me *tmp;
1189 if (close_me_head == NULL || close_me_head->fd != fd)
1190 error_msg_and_die("corrupt close_me");
1191 tmp = close_me_head;
1192 close_me_head = close_me_head->next;
1196 static void close_all(void)
1199 for (c=close_me_head; c; c=c->next) {
1202 close_me_head = NULL;
1205 /* squirrel != NULL means we squirrel away copies of stdin, stdout,
1206 * and stderr if they are redirected. */
1207 static int setup_redirects(struct child_prog *prog, int squirrel[])
1210 struct redir_struct *redir;
1212 for (redir=prog->redirects; redir; redir=redir->next) {
1213 if (redir->dup == -1 && redir->word.gl_pathv == NULL) {
1214 /* something went wrong in the parse. Pretend it didn't happen */
1217 if (redir->dup == -1) {
1218 mode=redir_table[redir->type].mode;
1219 openfd = open(redir->word.gl_pathv[0], mode, 0666);
1221 /* this could get lost if stderr has been redirected, but
1222 bash and ash both lose it as well (though zsh doesn't!) */
1223 perror_msg("error opening %s", redir->word.gl_pathv[0]);
1227 openfd = redir->dup;
1230 if (openfd != redir->fd) {
1231 if (squirrel && redir->fd < 3) {
1232 squirrel[redir->fd] = dup(redir->fd);
1237 dup2(openfd, redir->fd);
1238 if (redir->dup == -1)
1246 static void restore_redirects(int squirrel[])
1249 for (i=0; i<3; i++) {
1252 /* No error checking. I sure wouldn't know what
1253 * to do with an error if I found one! */
1261 /* XXX no exit() here. If you don't exec, use _exit instead.
1262 * The at_exit handlers apparently confuse the calling process,
1263 * in particular stdin handling. Not sure why? */
1264 static void pseudo_exec(struct child_prog *child)
1268 struct built_in_command *x;
1270 for (i=0; is_assignment(child->argv[i]); i++) {
1271 debug_printf("pid %d environment modification: %s\n",getpid(),child->argv[i]);
1272 p = insert_var_value(child->argv[i]);
1274 if (p != child->argv[i]) free(p);
1276 child->argv+=i; /* XXX this hack isn't so horrible, since we are about
1277 to exit, and therefore don't need to keep data
1278 structures consistent for free() use. */
1279 /* If a variable is assigned in a forest, and nobody listens,
1280 * was it ever really set?
1282 if (child->argv[0] == NULL) {
1283 _exit(EXIT_SUCCESS);
1287 * Check if the command matches any of the builtins.
1288 * Depending on context, this might be redundant. But it's
1289 * easier to waste a few CPU cycles than it is to figure out
1290 * if this is one of those cases.
1292 for (x = bltins; x->cmd; x++) {
1293 if (strcmp(child->argv[0], x->cmd) == 0 ) {
1294 debug_printf("builtin exec %s\n", child->argv[0]);
1295 rcode = x->function(child);
1301 /* Check if the command matches any busybox internal commands
1303 * FIXME: This feature is not 100% safe, since
1304 * BusyBox is not fully reentrant, so we have no guarantee the things
1305 * from the .bss are still zeroed, or that things from .data are still
1306 * at their defaults. We could exec ourself from /proc/self/exe, but I
1307 * really dislike relying on /proc for things. We could exec ourself
1308 * from global_argv[0], but if we are in a chroot, we may not be able
1309 * to find ourself... */
1310 #ifdef CONFIG_FEATURE_SH_STANDALONE_SHELL
1313 char** argv_l=child->argv;
1314 char *name = child->argv[0];
1316 #ifdef CONFIG_FEATURE_SH_APPLETS_ALWAYS_WIN
1317 /* Following discussions from November 2000 on the busybox mailing
1318 * list, the default configuration, (without
1319 * get_last_path_component()) lets the user force use of an
1320 * external command by specifying the full (with slashes) filename.
1321 * If you enable CONFIG_FEATURE_SH_APPLETS_ALWAYS_WIN then applets
1322 * _aways_ override external commands, so if you want to run
1323 * /bin/cat, it will use BusyBox cat even if /bin/cat exists on the
1324 * filesystem and is _not_ busybox. Some systems may want this,
1326 name = get_last_path_component(name);
1328 /* Count argc for use in a second... */
1329 for(argc_l=0;*argv_l!=NULL; argv_l++, argc_l++);
1331 debug_printf("running applet %s\n", name);
1332 run_applet_by_name(name, argc_l, child->argv);
1335 debug_printf("exec of %s\n",child->argv[0]);
1336 execvp(child->argv[0],child->argv);
1337 perror_msg("couldn't exec: %s",child->argv[0]);
1339 } else if (child->group) {
1340 debug_printf("runtime nesting to group\n");
1341 interactive=0; /* crucial!!!! */
1342 rcode = run_list_real(child->group);
1343 /* OK to leak memory by not calling free_pipe_list,
1344 * since this process is about to exit */
1347 /* Can happen. See what bash does with ">foo" by itself. */
1348 debug_printf("trying to pseudo_exec null command\n");
1349 _exit(EXIT_SUCCESS);
1353 static void insert_bg_job(struct pipe *pi)
1355 struct pipe *thejob;
1357 /* Linear search for the ID of the job to use */
1359 for (thejob = job_list; thejob; thejob = thejob->next)
1360 if (thejob->jobid >= pi->jobid)
1361 pi->jobid = thejob->jobid + 1;
1363 /* add thejob to the list of running jobs */
1365 thejob = job_list = xmalloc(sizeof(*thejob));
1367 for (thejob = job_list; thejob->next; thejob = thejob->next) /* nothing */;
1368 thejob->next = xmalloc(sizeof(*thejob));
1369 thejob = thejob->next;
1372 /* physically copy the struct job */
1373 memcpy(thejob, pi, sizeof(struct pipe));
1374 thejob->next = NULL;
1375 thejob->running_progs = thejob->num_progs;
1376 thejob->stopped_progs = 0;
1377 thejob->text = xmalloc(BUFSIZ); /* cmdedit buffer size */
1379 /*if (pi->progs[0] && pi->progs[0].argv && pi->progs[0].argv[0]) */
1381 char *bar=thejob->text;
1382 char **foo=pi->progs[0].argv;
1383 while(foo && *foo) {
1384 bar += sprintf(bar, "%s ", *foo++);
1388 /* we don't wait for background thejobs to return -- append it
1389 to the list of backgrounded thejobs and leave it alone */
1390 printf("[%d] %d\n", thejob->jobid, thejob->progs[0].pid);
1391 last_bg_pid = thejob->progs[0].pid;
1392 last_jobid = thejob->jobid;
1395 /* remove a backgrounded job */
1396 static void remove_bg_job(struct pipe *pi)
1398 struct pipe *prev_pipe;
1400 if (pi == job_list) {
1401 job_list = pi->next;
1403 prev_pipe = job_list;
1404 while (prev_pipe->next != pi)
1405 prev_pipe = prev_pipe->next;
1406 prev_pipe->next = pi->next;
1409 last_jobid = job_list->jobid;
1413 pi->stopped_progs = 0;
1418 /* Checks to see if any processes have exited -- if they
1419 have, figure out why and see if a job has completed */
1420 static int checkjobs(struct pipe* fg_pipe)
1428 attributes = WUNTRACED;
1429 if (fg_pipe==NULL) {
1430 attributes |= WNOHANG;
1433 while ((childpid = waitpid(-1, &status, attributes)) > 0) {
1436 for (i=0; i < fg_pipe->num_progs; i++) {
1437 if (fg_pipe->progs[i].pid == childpid) {
1438 if (i==fg_pipe->num_progs-1)
1439 rcode=WEXITSTATUS(status);
1440 (fg_pipe->num_progs)--;
1446 for (pi = job_list; pi; pi = pi->next) {
1448 while (prognum < pi->num_progs && pi->progs[prognum].pid != childpid) {
1451 if (prognum < pi->num_progs)
1456 debug_printf("checkjobs: pid %d was not in our list!\n", childpid);
1460 if (WIFEXITED(status) || WIFSIGNALED(status)) {
1462 pi->running_progs--;
1463 pi->progs[prognum].pid = 0;
1465 if (!pi->running_progs) {
1466 printf(JOB_STATUS_FORMAT, pi->jobid, "Done", pi->text);
1471 pi->stopped_progs++;
1472 pi->progs[prognum].is_stopped = 1;
1475 /* Printing this stuff is a pain, since it tends to
1476 * overwrite the prompt an inconveinient moments. So
1478 if (pi->stopped_progs == pi->num_progs) {
1479 printf("\n"JOB_STATUS_FORMAT, pi->jobid, "Stopped", pi->text);
1485 if (childpid == -1 && errno != ECHILD)
1486 perror_msg("waitpid");
1488 /* move the shell to the foreground */
1489 /*if (interactive && tcsetpgrp(shell_terminal, getpgid(0))) */
1490 /* perror_msg("tcsetpgrp-2"); */
1494 /* Figure out our controlling tty, checking in order stderr,
1495 * stdin, and stdout. If check_pgrp is set, also check that
1496 * we belong to the foreground process group associated with
1497 * that tty. The value of shell_terminal is needed in order to call
1498 * tcsetpgrp(shell_terminal, ...); */
1499 void controlling_tty(int check_pgrp)
1503 if ((curpgrp = tcgetpgrp(shell_terminal = 2)) < 0
1504 && (curpgrp = tcgetpgrp(shell_terminal = 0)) < 0
1505 && (curpgrp = tcgetpgrp(shell_terminal = 1)) < 0)
1506 goto shell_terminal_error;
1508 if (check_pgrp && curpgrp != getpgid(0))
1509 goto shell_terminal_error;
1513 shell_terminal_error:
1514 shell_terminal = -1;
1519 /* run_pipe_real() starts all the jobs, but doesn't wait for anything
1520 * to finish. See checkjobs().
1522 * return code is normally -1, when the caller has to wait for children
1523 * to finish to determine the exit status of the pipe. If the pipe
1524 * is a simple builtin command, however, the action is done by the
1525 * time run_pipe_real returns, and the exit code is provided as the
1528 * The input of the pipe is always stdin, the output is always
1529 * stdout. The outpipe[] mechanism in BusyBox-0.48 lash is bogus,
1530 * because it tries to avoid running the command substitution in
1531 * subshell, when that is in fact necessary. The subshell process
1532 * now has its stdout directed to the input of the appropriate pipe,
1533 * so this routine is noticeably simpler.
1535 static int run_pipe_real(struct pipe *pi)
1539 int nextin, nextout;
1540 int pipefds[2]; /* pipefds[0] is for reading */
1541 struct child_prog *child;
1542 struct built_in_command *x;
1545 /* Avoid longjmp clobbering */
1553 int flag = do_repeat ? CMD_FLAG_REPEAT : 0;
1554 struct child_prog *child;
1557 /* Avoid longjmp clobbering */
1562 #endif /* __U_BOOT__ */
1569 /* Check if this is a simple builtin (not part of a pipe).
1570 * Builtins within pipes have to fork anyway, and are handled in
1571 * pseudo_exec. "echo foo | read bar" doesn't work on bash, either.
1573 if (pi->num_progs == 1) child = & (pi->progs[0]);
1575 if (pi->num_progs == 1 && child->group && child->subshell == 0) {
1576 int squirrel[] = {-1, -1, -1};
1578 debug_printf("non-subshell grouping\n");
1579 setup_redirects(child, squirrel);
1580 /* XXX could we merge code with following builtin case,
1581 * by creating a pseudo builtin that calls run_list_real? */
1582 rcode = run_list_real(child->group);
1583 restore_redirects(squirrel);
1585 if (pi->num_progs == 1 && child->group) {
1587 debug_printf("non-subshell grouping\n");
1588 rcode = run_list_real(child->group);
1591 } else if (pi->num_progs == 1 && pi->progs[0].argv != NULL) {
1592 for (i=0; is_assignment(child->argv[i]); i++) { /* nothing */ }
1593 if (i!=0 && child->argv[i]==NULL) {
1594 /* assignments, but no command: set the local environment */
1595 for (i=0; child->argv[i]!=NULL; i++) {
1597 /* Ok, this case is tricky. We have to decide if this is a
1598 * local variable, or an already exported variable. If it is
1599 * already exported, we have to export the new value. If it is
1600 * not exported, we need only set this as a local variable.
1601 * This junk is all to decide whether or not to export this
1605 name = xstrdup(child->argv[i]);
1606 debug_printf("Local environment set: %s\n", name);
1607 value = strchr(name, '=');
1611 if ( get_local_var(name)) {
1616 p = insert_var_value(child->argv[i]);
1617 set_local_var(p, export_me);
1618 if (p != child->argv[i]) free(p);
1620 return EXIT_SUCCESS; /* don't worry about errors in set_local_var() yet */
1622 for (i = 0; is_assignment(child->argv[i]); i++) {
1623 p = insert_var_value(child->argv[i]);
1627 set_local_var(p, 0);
1629 if (p != child->argv[i]) {
1637 str = make_string(child->argv + i,
1638 child->argv_nonnull + i);
1639 parse_string_outer(str, FLAG_EXIT_FROM_LOOP | FLAG_REPARSING);
1641 return last_return_code;
1644 for (x = bltins; x->cmd; x++) {
1645 if (strcmp(child->argv[i], x->cmd) == 0 ) {
1646 int squirrel[] = {-1, -1, -1};
1648 if (x->function == builtin_exec && child->argv[i+1]==NULL) {
1649 debug_printf("magic exec\n");
1650 setup_redirects(child,NULL);
1651 return EXIT_SUCCESS;
1653 debug_printf("builtin inline %s\n", child->argv[0]);
1654 /* XXX setup_redirects acts on file descriptors, not FILEs.
1655 * This is perfect for work that comes after exec().
1656 * Is it really safe for inline use? Experimentally,
1657 * things seem to work with glibc. */
1658 setup_redirects(child, squirrel);
1660 child->argv += i; /* XXX horrible hack */
1661 rcode = x->function(child);
1662 /* XXX restore hack so free() can work right */
1664 restore_redirects(squirrel);
1669 /* check ";", because ,example , argv consist from
1670 * "help;flinfo" must not execute
1672 if (strchr(child->argv[i], ';')) {
1673 printf("Unknown command '%s' - try 'help' or use "
1674 "'run' command\n", child->argv[i]);
1677 /* Process the command */
1678 return cmd_process(flag, child->argc, child->argv,
1679 &flag_repeat, NULL);
1684 for (i = 0; i < pi->num_progs; i++) {
1685 child = & (pi->progs[i]);
1687 /* pipes are inserted between pairs of commands */
1688 if ((i + 1) < pi->num_progs) {
1689 if (pipe(pipefds)<0) perror_msg_and_die("pipe");
1690 nextout = pipefds[1];
1696 /* XXX test for failed fork()? */
1697 if (!(child->pid = fork())) {
1698 /* Set the handling for job control signals back to the default. */
1699 signal(SIGINT, SIG_DFL);
1700 signal(SIGQUIT, SIG_DFL);
1701 signal(SIGTERM, SIG_DFL);
1702 signal(SIGTSTP, SIG_DFL);
1703 signal(SIGTTIN, SIG_DFL);
1704 signal(SIGTTOU, SIG_DFL);
1705 signal(SIGCHLD, SIG_DFL);
1717 if (pipefds[0]!=-1) {
1718 close(pipefds[0]); /* opposite end of our output pipe */
1721 /* Like bash, explicit redirects override pipes,
1722 * and the pipe fd is available for dup'ing. */
1723 setup_redirects(child,NULL);
1725 if (interactive && pi->followup!=PIPE_BG) {
1726 /* If we (the child) win the race, put ourselves in the process
1727 * group whose leader is the first process in this pipe. */
1729 pi->pgrp = getpid();
1731 if (setpgid(0, pi->pgrp) == 0) {
1732 tcsetpgrp(2, pi->pgrp);
1740 /* put our child in the process group whose leader is the
1741 first process in this pipe */
1743 pi->pgrp = child->pid;
1745 /* Don't check for errors. The child may be dead already,
1746 * in which case setpgid returns error code EACCES. */
1747 setpgid(child->pid, pi->pgrp);
1754 /* If there isn't another process, nextin is garbage
1755 but it doesn't matter */
1756 nextin = pipefds[0];
1762 static int run_list_real(struct pipe *pi)
1764 char *save_name = NULL;
1766 char **save_list = NULL;
1772 int rcode=0, flag_skip=1;
1773 int flag_restore = 0;
1774 int if_code=0, next_if_code=0; /* need double-buffer to handle elif */
1775 reserved_style rmode, skip_more_in_this_rmode=RES_XXXX;
1776 /* check syntax for "for" */
1777 for (rpipe = pi; rpipe; rpipe = rpipe->next) {
1778 if ((rpipe->r_mode == RES_IN ||
1779 rpipe->r_mode == RES_FOR) &&
1780 (rpipe->next == NULL)) {
1787 if ((rpipe->r_mode == RES_IN &&
1788 (rpipe->next->r_mode == RES_IN &&
1789 rpipe->next->progs->argv != NULL))||
1790 (rpipe->r_mode == RES_FOR &&
1791 rpipe->next->r_mode != RES_IN)) {
1799 for (; pi; pi = (flag_restore != 0) ? rpipe : pi->next) {
1800 if (pi->r_mode == RES_WHILE || pi->r_mode == RES_UNTIL ||
1801 pi->r_mode == RES_FOR) {
1805 if ((had_ctrlc())) {
1816 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);
1817 if (rmode == skip_more_in_this_rmode && flag_skip) {
1818 if (pi->followup == PIPE_SEQ) flag_skip=0;
1822 skip_more_in_this_rmode = RES_XXXX;
1823 if (rmode == RES_THEN || rmode == RES_ELSE) if_code = next_if_code;
1824 if (rmode == RES_THEN && if_code) continue;
1825 if (rmode == RES_ELSE && !if_code) continue;
1826 if (rmode == RES_ELIF && !if_code) break;
1827 if (rmode == RES_FOR && pi->num_progs) {
1829 /* if no variable values after "in" we skip "for" */
1830 if (!pi->next->progs->argv) continue;
1831 /* create list of variable values */
1832 list = make_list_in(pi->next->progs->argv,
1833 pi->progs->argv[0]);
1835 save_name = pi->progs->argv[0];
1836 pi->progs->argv[0] = NULL;
1840 free(pi->progs->argv[0]);
1844 pi->progs->argv[0] = save_name;
1846 pi->progs->glob_result.gl_pathv[0] =
1851 /* insert new value from list for variable */
1852 if (pi->progs->argv[0])
1853 free(pi->progs->argv[0]);
1854 pi->progs->argv[0] = *list++;
1856 pi->progs->glob_result.gl_pathv[0] =
1861 if (rmode == RES_IN) continue;
1862 if (rmode == RES_DO) {
1863 if (!flag_rep) continue;
1865 if (rmode == RES_DONE) {
1872 if (pi->num_progs == 0) continue;
1874 save_num_progs = pi->num_progs; /* save number of programs */
1876 rcode = run_pipe_real(pi);
1877 debug_printf("run_pipe_real returned %d\n",rcode);
1880 /* We only ran a builtin: rcode was set by the return value
1881 * of run_pipe_real(), and we don't need to wait for anything. */
1882 } else if (pi->followup==PIPE_BG) {
1883 /* XXX check bash's behavior with nontrivial pipes */
1884 /* XXX compute jobid */
1885 /* XXX what does bash do with attempts to background builtins? */
1887 rcode = EXIT_SUCCESS;
1890 /* move the new process group into the foreground */
1891 if (tcsetpgrp(shell_terminal, pi->pgrp) && errno != ENOTTY)
1892 perror_msg("tcsetpgrp-3");
1893 rcode = checkjobs(pi);
1894 /* move the shell to the foreground */
1895 if (tcsetpgrp(shell_terminal, getpgid(0)) && errno != ENOTTY)
1896 perror_msg("tcsetpgrp-4");
1898 rcode = checkjobs(pi);
1900 debug_printf("checkjobs returned %d\n",rcode);
1902 last_return_code=rcode;
1905 last_return_code = -rcode - 2;
1906 return -2; /* exit */
1908 last_return_code=(rcode == 0) ? 0 : 1;
1911 pi->num_progs = save_num_progs; /* restore number of programs */
1913 if ( rmode == RES_IF || rmode == RES_ELIF )
1914 next_if_code=rcode; /* can be overwritten a number of times */
1915 if (rmode == RES_WHILE)
1916 flag_rep = !last_return_code;
1917 if (rmode == RES_UNTIL)
1918 flag_rep = last_return_code;
1919 if ( (rcode==EXIT_SUCCESS && pi->followup==PIPE_OR) ||
1920 (rcode!=EXIT_SUCCESS && pi->followup==PIPE_AND) )
1921 skip_more_in_this_rmode=rmode;
1929 /* broken, of course, but OK for testing */
1930 static char *indenter(int i)
1932 static char blanks[]=" ";
1933 return &blanks[sizeof(blanks)-i-1];
1936 /* return code is the exit status of the pipe */
1937 static int free_pipe(struct pipe *pi, int indent)
1940 struct child_prog *child;
1942 struct redir_struct *r, *rnext;
1944 int a, i, ret_code=0;
1945 char *ind = indenter(indent);
1948 if (pi->stopped_progs > 0)
1950 final_printf("%s run pipe: (pid %d)\n",ind,getpid());
1952 for (i=0; i<pi->num_progs; i++) {
1953 child = &pi->progs[i];
1954 final_printf("%s command %d:\n",ind,i);
1956 for (a=0,p=child->argv; *p; a++,p++) {
1957 final_printf("%s argv[%d] = %s\n",ind,a,*p);
1960 globfree(&child->glob_result);
1962 for (a = 0; a < child->argc; a++) {
1963 free(child->argv[a]);
1966 free(child->argv_nonnull);
1970 } else if (child->group) {
1972 final_printf("%s begin group (subshell:%d)\n",ind, child->subshell);
1974 ret_code = free_pipe_list(child->group,indent+3);
1975 final_printf("%s end group\n",ind);
1977 final_printf("%s (nil)\n",ind);
1980 for (r=child->redirects; r; r=rnext) {
1981 final_printf("%s redirect %d%s", ind, r->fd, redir_table[r->type].descrip);
1983 /* guard against the case >$FOO, where foo is unset or blank */
1984 if (r->word.gl_pathv) {
1985 final_printf(" %s\n", *r->word.gl_pathv);
1989 final_printf("&%d\n", r->dup);
1994 child->redirects=NULL;
1997 free(pi->progs); /* children are an array, they get freed all at once */
2002 static int free_pipe_list(struct pipe *head, int indent)
2004 int rcode=0; /* if list has no members */
2005 struct pipe *pi, *next;
2006 char *ind = indenter(indent);
2007 for (pi=head; pi; pi=next) {
2008 final_printf("%s pipe reserved mode %d\n", ind, pi->r_mode);
2009 rcode = free_pipe(pi, indent);
2010 final_printf("%s pipe followup code %d\n", ind, pi->followup);
2018 /* Select which version we will use */
2019 static int run_list(struct pipe *pi)
2025 rcode = run_list_real(pi);
2029 /* free_pipe_list has the side effect of clearing memory
2030 * In the long run that function can be merged with run_list_real,
2031 * but doing that now would hobble the debugging effort. */
2032 free_pipe_list(pi,0);
2036 /* The API for glob is arguably broken. This routine pushes a non-matching
2037 * string into the output structure, removing non-backslashed backslashes.
2038 * If someone can prove me wrong, by performing this function within the
2039 * original glob(3) api, feel free to rewrite this routine into oblivion.
2040 * Return code (0 vs. GLOB_NOSPACE) matches glob(3).
2041 * XXX broken if the last character is '\\', check that before calling.
2044 static int globhack(const char *src, int flags, glob_t *pglob)
2049 for (cnt=1, s=src; s && *s; s++) {
2050 if (*s == '\\') s++;
2054 if (!dest) return GLOB_NOSPACE;
2055 if (!(flags & GLOB_APPEND)) {
2056 pglob->gl_pathv=NULL;
2061 pathc = ++pglob->gl_pathc;
2062 pglob->gl_pathv = realloc(pglob->gl_pathv, (pathc+1)*sizeof(*pglob->gl_pathv));
2063 if (pglob->gl_pathv == NULL) return GLOB_NOSPACE;
2064 pglob->gl_pathv[pathc-1]=dest;
2065 pglob->gl_pathv[pathc]=NULL;
2066 for (s=src; s && *s; s++, dest++) {
2067 if (*s == '\\') s++;
2074 /* XXX broken if the last character is '\\', check that before calling */
2075 static int glob_needed(const char *s)
2078 if (*s == '\\') s++;
2079 if (strchr("*[?",*s)) return 1;
2085 static void globprint(glob_t *pglob)
2088 debug_printf("glob_t at %p:\n", pglob);
2089 debug_printf(" gl_pathc=%d gl_pathv=%p gl_offs=%d gl_flags=%d\n",
2090 pglob->gl_pathc, pglob->gl_pathv, pglob->gl_offs, pglob->gl_flags);
2091 for (i=0; i<pglob->gl_pathc; i++)
2092 debug_printf("pglob->gl_pathv[%d] = %p = %s\n", i,
2093 pglob->gl_pathv[i], pglob->gl_pathv[i]);
2097 static int xglob(o_string *dest, int flags, glob_t *pglob)
2101 /* short-circuit for null word */
2102 /* we can code this better when the debug_printf's are gone */
2103 if (dest->length == 0) {
2104 if (dest->nonnull) {
2105 /* bash man page calls this an "explicit" null */
2106 gr = globhack(dest->data, flags, pglob);
2107 debug_printf("globhack returned %d\n",gr);
2111 } else if (glob_needed(dest->data)) {
2112 gr = glob(dest->data, flags, NULL, pglob);
2113 debug_printf("glob returned %d\n",gr);
2114 if (gr == GLOB_NOMATCH) {
2115 /* quote removal, or more accurately, backslash removal */
2116 gr = globhack(dest->data, flags, pglob);
2117 debug_printf("globhack returned %d\n",gr);
2120 gr = globhack(dest->data, flags, pglob);
2121 debug_printf("globhack returned %d\n",gr);
2123 if (gr == GLOB_NOSPACE)
2124 error_msg_and_die("out of memory during glob");
2125 if (gr != 0) { /* GLOB_ABORTED ? */
2126 error_msg("glob(3) error %d",gr);
2128 /* globprint(glob_target); */
2134 static char *get_dollar_var(char ch);
2137 /* This is used to get/check local shell variables */
2138 char *get_local_var(const char *s)
2140 struct variables *cur;
2147 return get_dollar_var(s[1]);
2150 for (cur = top_vars; cur; cur=cur->next)
2151 if(strcmp(cur->name, s)==0)
2156 /* This is used to set local shell variables
2157 flg_export==0 if only local (not exporting) variable
2158 flg_export==1 if "new" exporting environ
2159 flg_export>1 if current startup environ (not call putenv()) */
2160 int set_local_var(const char *s, int flg_export)
2164 struct variables *cur;
2167 /* might be possible! */
2175 if (env_get(name) != NULL) {
2177 "There is a global environment variable with the same name.\n");
2182 /* Assume when we enter this function that we are already in
2183 * NAME=VALUE format. So the first order of business is to
2184 * split 's' on the '=' into 'name' and 'value' */
2185 value = strchr(name, '=');
2186 if (value == NULL || *(value + 1) == 0) {
2192 for(cur = top_vars; cur; cur = cur->next) {
2193 if(strcmp(cur->name, name)==0)
2198 if(strcmp(cur->value, value)==0) {
2199 if(flg_export>0 && cur->flg_export==0)
2200 cur->flg_export=flg_export;
2204 if(cur->flg_read_only) {
2205 error_msg("%s: readonly variable", name);
2208 if(flg_export>0 || cur->flg_export>1)
2212 cur->value = strdup(value);
2216 cur = malloc(sizeof(struct variables));
2220 cur->name = strdup(name);
2221 if (cur->name == NULL) {
2225 struct variables *bottom = top_vars;
2226 cur->value = strdup(value);
2228 cur->flg_export = flg_export;
2229 cur->flg_read_only = 0;
2230 while(bottom->next) bottom=bottom->next;
2237 if(result==0 && cur->flg_export==1) {
2239 result = putenv(name);
2244 if(result>0) /* equivalent to previous set */
2251 void unset_local_var(const char *name)
2253 struct variables *cur;
2256 for (cur = top_vars; cur; cur=cur->next) {
2257 if(strcmp(cur->name, name)==0)
2261 struct variables *next = top_vars;
2262 if(cur->flg_read_only) {
2263 error_msg("%s: readonly variable", name);
2268 unenv_set(cur->name);
2272 while (next->next != cur)
2274 next->next = cur->next;
2281 static int is_assignment(const char *s)
2286 if (!isalpha(*s)) return 0;
2288 while(isalnum(*s) || *s=='_') ++s;
2293 /* the src parameter allows us to peek forward to a possible &n syntax
2294 * for file descriptor duplication, e.g., "2>&1".
2295 * Return code is 0 normally, 1 if a syntax error is detected in src.
2296 * Resource errors (in xmalloc) cause the process to exit */
2297 static int setup_redirect(struct p_context *ctx, int fd, redir_type style,
2298 struct in_str *input)
2300 struct child_prog *child=ctx->child;
2301 struct redir_struct *redir = child->redirects;
2302 struct redir_struct *last_redir=NULL;
2304 /* Create a new redir_struct and drop it onto the end of the linked list */
2309 redir = xmalloc(sizeof(struct redir_struct));
2311 redir->word.gl_pathv=NULL;
2313 last_redir->next=redir;
2315 child->redirects=redir;
2319 redir->fd= (fd==-1) ? redir_table[style].default_fd : fd ;
2321 debug_printf("Redirect type %d%s\n", redir->fd, redir_table[style].descrip);
2323 /* Check for a '2>&1' type redirect */
2324 redir->dup = redirect_dup_num(input);
2325 if (redir->dup == -2) return 1; /* syntax error */
2326 if (redir->dup != -1) {
2327 /* Erik had a check here that the file descriptor in question
2328 * is legit; I postpone that to "run time"
2329 * A "-" representation of "close me" shows up as a -3 here */
2330 debug_printf("Duplicating redirect '%d>&%d'\n", redir->fd, redir->dup);
2332 /* We do _not_ try to open the file that src points to,
2333 * since we need to return and let src be expanded first.
2334 * Set ctx->pending_redirect, so we know what to do at the
2335 * end of the next parsed word.
2337 ctx->pending_redirect = redir;
2343 static struct pipe *new_pipe(void)
2346 pi = xmalloc(sizeof(struct pipe));
2350 pi->followup = 0; /* invalid */
2351 pi->r_mode = RES_NONE;
2355 static void initialize_context(struct p_context *ctx)
2359 ctx->pending_redirect=NULL;
2362 ctx->list_head=new_pipe();
2363 ctx->pipe=ctx->list_head;
2369 done_command(ctx); /* creates the memory for working child */
2372 /* normal return is 0
2373 * if a reserved word is found, and processed, return 1
2374 * should handle if, then, elif, else, fi, for, while, until, do, done.
2375 * case, function, and select are obnoxious, save those for later.
2377 struct reserved_combo {
2382 /* Mostly a list of accepted follow-up reserved words.
2383 * FLAG_END means we are done with the sequence, and are ready
2384 * to turn the compound list into a command.
2385 * FLAG_START means the word must start a new compound list.
2387 static struct reserved_combo reserved_list[] = {
2388 { "if", RES_IF, FLAG_THEN | FLAG_START },
2389 { "then", RES_THEN, FLAG_ELIF | FLAG_ELSE | FLAG_FI },
2390 { "elif", RES_ELIF, FLAG_THEN },
2391 { "else", RES_ELSE, FLAG_FI },
2392 { "fi", RES_FI, FLAG_END },
2393 { "for", RES_FOR, FLAG_IN | FLAG_START },
2394 { "while", RES_WHILE, FLAG_DO | FLAG_START },
2395 { "until", RES_UNTIL, FLAG_DO | FLAG_START },
2396 { "in", RES_IN, FLAG_DO },
2397 { "do", RES_DO, FLAG_DONE },
2398 { "done", RES_DONE, FLAG_END }
2400 #define NRES (sizeof(reserved_list)/sizeof(struct reserved_combo))
2402 static int reserved_word(o_string *dest, struct p_context *ctx)
2404 struct reserved_combo *r;
2405 for (r=reserved_list;
2406 r<reserved_list+NRES; r++) {
2407 if (strcmp(dest->data, r->literal) == 0) {
2408 debug_printf("found reserved word %s, code %d\n",r->literal,r->code);
2409 if (r->flag & FLAG_START) {
2410 struct p_context *new = xmalloc(sizeof(struct p_context));
2411 debug_printf("push stack\n");
2412 if (ctx->w == RES_IN || ctx->w == RES_FOR) {
2419 *new = *ctx; /* physical copy */
2420 initialize_context(ctx);
2422 } else if ( ctx->w == RES_NONE || ! (ctx->old_flag & (1<<r->code))) {
2429 ctx->old_flag = r->flag;
2430 if (ctx->old_flag & FLAG_END) {
2431 struct p_context *old;
2432 debug_printf("pop stack\n");
2433 done_pipe(ctx,PIPE_SEQ);
2435 old->child->group = ctx->list_head;
2437 old->child->subshell = 0;
2439 *ctx = *old; /* physical copy */
2449 /* normal return is 0.
2450 * Syntax or xglob errors return 1. */
2451 static int done_word(o_string *dest, struct p_context *ctx)
2453 struct child_prog *child=ctx->child;
2455 glob_t *glob_target;
2462 debug_printf("done_word: %s %p\n", dest->data, child);
2463 if (dest->length == 0 && !dest->nonnull) {
2464 debug_printf(" true null, ignored\n");
2468 if (ctx->pending_redirect) {
2469 glob_target = &ctx->pending_redirect->word;
2474 return 1; /* syntax error, groups and arglists don't mix */
2476 if (!child->argv && (ctx->type & FLAG_PARSE_SEMICOLON)) {
2477 debug_printf("checking %s for reserved-ness\n",dest->data);
2478 if (reserved_word(dest,ctx)) return ctx->w==RES_SNTX;
2481 glob_target = &child->glob_result;
2482 if (child->argv) flags |= GLOB_APPEND;
2484 for (cnt = 1, s = dest->data; s && *s; s++) {
2485 if (*s == '\\') s++;
2490 if ( child->argv == NULL) {
2493 argc = ++child->argc;
2494 child->argv = realloc(child->argv, (argc+1)*sizeof(*child->argv));
2495 if (child->argv == NULL) {
2499 child->argv_nonnull = realloc(child->argv_nonnull,
2500 (argc+1)*sizeof(*child->argv_nonnull));
2501 if (child->argv_nonnull == NULL) {
2505 child->argv[argc-1]=str;
2506 child->argv_nonnull[argc-1] = dest->nonnull;
2507 child->argv[argc]=NULL;
2508 child->argv_nonnull[argc] = 0;
2509 for (s = dest->data; s && *s; s++,str++) {
2510 if (*s == '\\') s++;
2517 gr = xglob(dest, flags, glob_target);
2518 if (gr != 0) return 1;
2523 if (ctx->pending_redirect) {
2524 ctx->pending_redirect=NULL;
2525 if (glob_target->gl_pathc != 1) {
2526 error_msg("ambiguous redirect");
2530 child->argv = glob_target->gl_pathv;
2533 if (ctx->w == RES_FOR) {
2534 done_word(dest,ctx);
2535 done_pipe(ctx,PIPE_SEQ);
2540 /* The only possible error here is out of memory, in which case
2542 static int done_command(struct p_context *ctx)
2544 /* The child is really already in the pipe structure, so
2545 * advance the pipe counter and make a new, null child.
2546 * Only real trickiness here is that the uncommitted
2547 * child structure, to which ctx->child points, is not
2548 * counted in pi->num_progs. */
2549 struct pipe *pi=ctx->pipe;
2550 struct child_prog *prog=ctx->child;
2552 if (prog && prog->group == NULL
2553 && prog->argv == NULL
2555 && prog->redirects == NULL) {
2559 debug_printf("done_command: skipping null command\n");
2563 debug_printf("done_command: num_progs incremented to %d\n",pi->num_progs);
2565 debug_printf("done_command: initializing\n");
2567 pi->progs = xrealloc(pi->progs, sizeof(*pi->progs) * (pi->num_progs+1));
2569 prog = pi->progs + pi->num_progs;
2571 prog->redirects = NULL;
2574 prog->argv_nonnull = NULL;
2576 prog->is_stopped = 0;
2580 prog->glob_result.gl_pathv = NULL;
2585 prog->type = ctx->type;
2587 /* but ctx->pipe and ctx->list_head remain unchanged */
2591 static int done_pipe(struct p_context *ctx, pipe_style type)
2594 done_command(ctx); /* implicit closure of previous command */
2595 debug_printf("done_pipe, type %d\n", type);
2596 ctx->pipe->followup = type;
2597 ctx->pipe->r_mode = ctx->w;
2599 ctx->pipe->next = new_p;
2602 done_command(ctx); /* set up new pipe to accept commands */
2607 /* peek ahead in the in_str to find out if we have a "&n" construct,
2608 * as in "2>&1", that represents duplicating a file descriptor.
2609 * returns either -2 (syntax error), -1 (no &), or the number found.
2611 static int redirect_dup_num(struct in_str *input)
2615 if (ch != '&') return -1;
2617 b_getch(input); /* get the & */
2621 return -3; /* "-" represents "close me" */
2623 while (isdigit(ch)) {
2631 error_msg("ambiguous redirect");
2635 /* If a redirect is immediately preceded by a number, that number is
2636 * supposed to tell which file descriptor to redirect. This routine
2637 * looks for such preceding numbers. In an ideal world this routine
2638 * needs to handle all the following classes of redirects...
2639 * echo 2>foo # redirects fd 2 to file "foo", nothing passed to echo
2640 * echo 49>foo # redirects fd 49 to file "foo", nothing passed to echo
2641 * echo -2>foo # redirects fd 1 to file "foo", "-2" passed to echo
2642 * echo 49x>foo # redirects fd 1 to file "foo", "49x" passed to echo
2643 * A -1 output from this program means no valid number was found, so the
2644 * caller should use the appropriate default for this redirection.
2646 static int redirect_opt_num(o_string *o)
2650 if (o->length==0) return -1;
2651 for(num=0; num<o->length; num++) {
2652 if (!isdigit(*(o->data+num))) {
2656 /* reuse num (and save an int) */
2662 FILE *generate_stream_from_list(struct pipe *head)
2666 int pid, channel[2];
2667 if (pipe(channel)<0) perror_msg_and_die("pipe");
2670 perror_msg_and_die("fork");
2671 } else if (pid==0) {
2673 if (channel[1] != 1) {
2678 #define SURROGATE "surrogate response"
2679 write(1,SURROGATE,sizeof(SURROGATE));
2680 _exit(run_list(head));
2682 _exit(run_list_real(head)); /* leaks memory */
2685 debug_printf("forked child %d\n",pid);
2687 pf = fdopen(channel[0],"r");
2688 debug_printf("pipe on FILE *%p\n",pf);
2690 free_pipe_list(head,0);
2691 pf=popen("echo surrogate response","r");
2692 debug_printf("started fake pipe on FILE *%p\n",pf);
2697 /* this version hacked for testing purposes */
2698 /* return code is exit status of the process that is run. */
2699 static int process_command_subs(o_string *dest, struct p_context *ctx, struct in_str *input, int subst_end)
2702 o_string result=NULL_O_STRING;
2703 struct p_context inner;
2705 struct in_str pipe_str;
2706 initialize_context(&inner);
2708 /* recursion to generate command */
2709 retcode = parse_stream(&result, &inner, input, subst_end);
2710 if (retcode != 0) return retcode; /* syntax error or EOF */
2711 done_word(&result, &inner);
2712 done_pipe(&inner, PIPE_SEQ);
2715 p=generate_stream_from_list(inner.list_head);
2716 if (p==NULL) return 1;
2717 mark_open(fileno(p));
2718 setup_file_in_str(&pipe_str, p);
2720 /* now send results of command back into original context */
2721 retcode = parse_stream(dest, ctx, &pipe_str, '\0');
2722 /* XXX In case of a syntax error, should we try to kill the child?
2723 * That would be tough to do right, so just read until EOF. */
2725 while (b_getch(&pipe_str)!=EOF) { /* discard */ };
2728 debug_printf("done reading from pipe, pclose()ing\n");
2729 /* This is the step that wait()s for the child. Should be pretty
2730 * safe, since we just read an EOF from its stdout. We could try
2731 * to better, by using wait(), and keeping track of background jobs
2732 * at the same time. That would be a lot of work, and contrary
2733 * to the KISS philosophy of this program. */
2734 mark_closed(fileno(p));
2736 free_pipe_list(inner.list_head,0);
2737 debug_printf("pclosed, retcode=%d\n",retcode);
2738 /* XXX this process fails to trim a single trailing newline */
2742 static int parse_group(o_string *dest, struct p_context *ctx,
2743 struct in_str *input, int ch)
2746 struct p_context sub;
2747 struct child_prog *child = ctx->child;
2750 return 1; /* syntax error, groups and arglists don't mix */
2752 initialize_context(&sub);
2754 case '(': endch=')'; child->subshell=1; break;
2755 case '{': endch='}'; break;
2756 default: syntax(); /* really logic error */
2758 rcode=parse_stream(dest,&sub,input,endch);
2759 done_word(dest,&sub); /* finish off the final word in the subcontext */
2760 done_pipe(&sub, PIPE_SEQ); /* and the final command there, too */
2761 child->group = sub.list_head;
2763 /* child remains "open", available for possible redirects */
2767 /* basically useful version until someone wants to get fancier,
2768 * see the bash man page under "Parameter Expansion" */
2769 static char *lookup_param(char *src)
2773 char *default_val = NULL;
2775 int expand_empty = 0;
2780 sep = strchr(src, ':');
2784 if (*(sep + 1) == '-')
2785 default_val = sep+2;
2786 if (*(sep + 1) == '=') {
2787 default_val = sep+2;
2790 if (*(sep + 1) == '+') {
2791 default_val = sep+2;
2798 p = get_local_var(src);
2800 if (!p || strlen(p) == 0) {
2803 char *var = malloc(strlen(src)+strlen(default_val)+2);
2805 sprintf(var, "%s=%s", src, default_val);
2806 set_local_var(var, 0);
2810 } else if (expand_empty) {
2821 static char *get_dollar_var(char ch)
2823 static char buf[40];
2828 sprintf(buf, "%u", (unsigned int)last_return_code);
2837 /* return code: 0 for OK, 1 for syntax error */
2838 static int handle_dollar(o_string *dest, struct p_context *ctx, struct in_str *input)
2848 int ch = input->peek(input); /* first character after the $ */
2849 debug_printf("handle_dollar: ch=%c\n",ch);
2851 b_addchr(dest, SPECIAL_VAR_SYMBOL);
2853 while(ch=b_peek(input),isalnum(ch) || ch=='_') {
2857 b_addchr(dest, SPECIAL_VAR_SYMBOL);
2859 } else if (isdigit(ch)) {
2860 i = ch-'0'; /* XXX is $0 special? */
2861 if (i<global_argc) {
2862 parse_string(dest, ctx, global_argv[i]); /* recursion */
2866 } else switch (ch) {
2869 b_adduint(dest,getpid());
2873 if (last_bg_pid > 0) b_adduint(dest, last_bg_pid);
2879 b_adduint(dest,last_return_code);
2882 b_addchr(dest, SPECIAL_VAR_SYMBOL);
2883 b_addchr(dest, '$');
2884 b_addchr(dest, '?');
2885 b_addchr(dest, SPECIAL_VAR_SYMBOL);
2891 b_adduint(dest,global_argc ? global_argc-1 : 0);
2896 b_addchr(dest, SPECIAL_VAR_SYMBOL);
2899 /* XXX maybe someone will try to escape the '}' */
2900 while(ch=b_getch(input),ch!=EOF && ch!='}') {
2907 b_addchr(dest, SPECIAL_VAR_SYMBOL);
2912 process_command_subs(dest, ctx, input, ')');
2916 for (i=1; i<global_argc; i++) {
2917 parse_string(dest, ctx, global_argv[i]);
2918 if (i+1 < global_argc) parse_string(dest, ctx, sep);
2924 /* still unhandled, but should be eventually */
2925 error_msg("unhandled syntax: $%c",ch);
2930 b_addqchr(dest,'$',dest->quote);
2932 /* Eat the character if the flag was set. If the compiler
2933 * is smart enough, we could substitute "b_getch(input);"
2934 * for all the "advance = 1;" above, and also end up with
2935 * a nice size-optimized program. Hah! That'll be the day.
2937 if (advance) b_getch(input);
2942 int parse_string(o_string *dest, struct p_context *ctx, const char *src)
2945 setup_string_in_str(&foo, src);
2946 return parse_stream(dest, ctx, &foo, '\0');
2950 /* return code is 0 for normal exit, 1 for syntax error */
2951 static int parse_stream(o_string *dest, struct p_context *ctx,
2952 struct in_str *input, int end_trigger)
2957 redir_type redir_style;
2961 /* Only double-quote state is handled in the state variable dest->quote.
2962 * A single-quote triggers a bypass of the main loop until its mate is
2963 * found. When recursing, quote state is passed in via dest->quote. */
2965 debug_printf("parse_stream, end_trigger=%d\n",end_trigger);
2966 while ((ch=b_getch(input))!=EOF) {
2969 if (input->__promptme == 0) return 1;
2971 next = (ch == '\n') ? 0 : b_peek(input);
2973 debug_printf("parse_stream: ch=%c (%d) m=%d quote=%d - %c\n",
2974 ch >= ' ' ? ch : '.', ch, m,
2975 dest->quote, ctx->stack == NULL ? '*' : '.');
2977 if (m==0 || ((m==1 || m==2) && dest->quote)) {
2978 b_addqchr(dest, ch, dest->quote);
2980 if (m==2) { /* unquoted IFS */
2981 if (done_word(dest, ctx)) {
2984 /* If we aren't performing a substitution, treat a newline as a
2985 * command separator. */
2986 if (end_trigger != '\0' && ch=='\n')
2987 done_pipe(ctx,PIPE_SEQ);
2989 if (ch == end_trigger && !dest->quote && ctx->w==RES_NONE) {
2990 debug_printf("leaving parse_stream (triggered)\n");
2995 /* Yahoo! Time to run with it! */
2996 done_pipe(ctx,PIPE_SEQ);
2997 run_list(ctx->list_head);
2998 initialize_context(ctx);
3001 if (m!=2) switch (ch) {
3003 if (dest->length == 0 && !dest->quote) {
3004 while(ch=b_peek(input),ch!=EOF && ch!='\n') { b_getch(input); }
3006 b_addqchr(dest, ch, dest->quote);
3014 b_addqchr(dest, '\\', dest->quote);
3015 b_addqchr(dest, b_getch(input), dest->quote);
3018 if (handle_dollar(dest, ctx, input)!=0) return 1;
3022 while(ch=b_getch(input),ch!=EOF && ch!='\'') {
3024 if(input->__promptme == 0) return 1;
3035 dest->quote = !dest->quote;
3039 process_command_subs(dest, ctx, input, '`');
3042 redir_fd = redirect_opt_num(dest);
3043 done_word(dest, ctx);
3044 redir_style=REDIRECT_OVERWRITE;
3046 redir_style=REDIRECT_APPEND;
3048 } else if (next == '(') {
3049 syntax(); /* until we support >(list) Process Substitution */
3052 setup_redirect(ctx, redir_fd, redir_style, input);
3055 redir_fd = redirect_opt_num(dest);
3056 done_word(dest, ctx);
3057 redir_style=REDIRECT_INPUT;
3059 redir_style=REDIRECT_HEREIS;
3061 } else if (next == '>') {
3062 redir_style=REDIRECT_IO;
3064 } else if (next == '(') {
3065 syntax(); /* until we support <(list) Process Substitution */
3068 setup_redirect(ctx, redir_fd, redir_style, input);
3072 done_word(dest, ctx);
3073 done_pipe(ctx,PIPE_SEQ);
3076 done_word(dest, ctx);
3079 done_pipe(ctx,PIPE_AND);
3082 done_pipe(ctx,PIPE_BG);
3090 done_word(dest, ctx);
3093 done_pipe(ctx,PIPE_OR);
3095 /* we could pick up a file descriptor choice here
3096 * with redirect_opt_num(), but bash doesn't do it.
3097 * "echo foo 2| cat" yields "foo 2". */
3109 if (parse_group(dest, ctx, input, ch)!=0) return 1;
3113 syntax(); /* Proper use of this character caught by end_trigger */
3117 case SUBSTED_VAR_SYMBOL:
3119 while (ch = b_getch(input), ch != EOF &&
3120 ch != SUBSTED_VAR_SYMBOL) {
3121 debug_printf("subst, pass=%d\n", ch);
3122 if (input->__promptme == 0)
3126 debug_printf("subst, term=%d\n", ch);
3133 syntax(); /* this is really an internal logic error */
3138 /* complain if quote? No, maybe we just finished a command substitution
3139 * that was quoted. Example:
3140 * $ echo "`cat foo` plus more"
3141 * and we just got the EOF generated by the subshell that ran "cat foo"
3142 * The only real complaint is if we got an EOF when end_trigger != '\0',
3143 * that is, we were really supposed to get end_trigger, and never got
3144 * one before the EOF. Can't use the standard "syntax error" return code,
3145 * so that parse_stream_outer can distinguish the EOF and exit smoothly. */
3146 debug_printf("leaving parse_stream (EOF)\n");
3147 if (end_trigger != '\0') return -1;
3151 static void mapset(const unsigned char *set, int code)
3153 const unsigned char *s;
3154 for (s=set; *s; s++) map[*s] = code;
3157 static void update_ifs_map(void)
3159 /* char *ifs and char map[256] are both globals. */
3160 ifs = (uchar *)env_get("IFS");
3161 if (ifs == NULL) ifs=(uchar *)" \t\n";
3162 /* Precompute a list of 'flow through' behavior so it can be treated
3163 * quickly up front. Computation is necessary because of IFS.
3164 * Special case handling of IFS == " \t\n" is not implemented.
3165 * The map[] array only really needs two bits each, and on most machines
3166 * that would be faster because of the reduced L1 cache footprint.
3168 memset(map,0,sizeof(map)); /* most characters flow through always */
3170 mapset((uchar *)"\\$'\"`", 3); /* never flow through */
3171 mapset((uchar *)"<>;&|(){}#", 1); /* flow through if quoted */
3174 uchar subst[2] = {SUBSTED_VAR_SYMBOL, 0};
3175 mapset(subst, 3); /* never flow through */
3177 mapset((uchar *)"\\$'\"", 3); /* never flow through */
3178 mapset((uchar *)";&|#", 1); /* flow through if quoted */
3180 mapset(ifs, 2); /* also flow through if quoted */
3183 /* most recursion does not come through here, the exeception is
3184 * from builtin_source() */
3185 static int parse_stream_outer(struct in_str *inp, int flag)
3188 struct p_context ctx;
3189 o_string temp=NULL_O_STRING;
3196 initialize_context(&ctx);
3198 if (!(flag & FLAG_PARSE_SEMICOLON) || (flag & FLAG_REPARSING)) mapset((uchar *)";$&|", 0);
3200 rcode = parse_stream(&temp, &ctx, inp,
3201 flag & FLAG_CONT_ON_NEWLINE ? -1 : '\n');
3203 if (rcode == 1) flag_repeat = 0;
3205 if (rcode != 1 && ctx.old_flag != 0) {
3211 if (rcode != 1 && ctx.old_flag == 0) {
3212 done_word(&temp, &ctx);
3213 done_pipe(&ctx,PIPE_SEQ);
3215 run_list(ctx.list_head);
3217 code = run_list(ctx.list_head);
3218 if (code == -2) { /* exit */
3221 /* XXX hackish way to not allow exit from main loop */
3222 if (inp->peek == file_peek) {
3223 printf("exit not allowed from main input shell.\n");
3232 if (ctx.old_flag != 0) {
3237 if (inp->__promptme == 0) printf("<INTERRUPT>\n");
3238 inp->__promptme = 1;
3243 free_pipe_list(ctx.list_head,0);
3246 /* loop on syntax errors, return on EOF */
3247 } while (rcode != -1 && !(flag & FLAG_EXIT_FROM_LOOP) &&
3248 (inp->peek != static_peek || b_peek(inp)));
3252 return (code != 0) ? 1 : 0;
3253 #endif /* __U_BOOT__ */
3257 static int parse_string_outer(const char *s, int flag)
3259 int parse_string_outer(const char *s, int flag)
3260 #endif /* __U_BOOT__ */
3262 struct in_str input;
3270 if (!(p = strchr(s, '\n')) || *++p) {
3271 p = xmalloc(strlen(s) + 2);
3274 setup_string_in_str(&input, p);
3275 rcode = parse_stream_outer(&input, flag);
3280 setup_string_in_str(&input, s);
3281 return parse_stream_outer(&input, flag);
3288 static int parse_file_outer(FILE *f)
3290 int parse_file_outer(void)
3294 struct in_str input;
3296 setup_file_in_str(&input, f);
3298 setup_file_in_str(&input);
3300 rcode = parse_stream_outer(&input, FLAG_PARSE_SEMICOLON);
3305 #ifdef CONFIG_NEEDS_MANUAL_RELOC
3306 static void u_boot_hush_reloc(void)
3309 struct reserved_combo *r;
3311 for (r=reserved_list; r<reserved_list+NRES; r++) {
3312 addr = (ulong) (r->literal) + gd->reloc_off;
3313 r->literal = (char *)addr;
3318 int u_boot_hush_start(void)
3320 if (top_vars == NULL) {
3321 top_vars = malloc(sizeof(struct variables));
3322 top_vars->name = "HUSH_VERSION";
3323 top_vars->value = "0.01";
3324 top_vars->next = NULL;
3325 top_vars->flg_export = 0;
3326 top_vars->flg_read_only = 1;
3327 #ifdef CONFIG_NEEDS_MANUAL_RELOC
3328 u_boot_hush_reloc();
3334 static void *xmalloc(size_t size)
3338 if (!(p = malloc(size))) {
3339 printf("ERROR : memory not allocated\n");
3345 static void *xrealloc(void *ptr, size_t size)
3349 if (!(p = realloc(ptr, size))) {
3350 printf("ERROR : memory not allocated\n");
3355 #endif /* __U_BOOT__ */
3358 /* Make sure we have a controlling tty. If we get started under a job
3359 * aware app (like bash for example), make sure we are now in charge so
3360 * we don't fight over who gets the foreground */
3361 static void setup_job_control(void)
3363 static pid_t shell_pgrp;
3364 /* Loop until we are in the foreground. */
3365 while (tcgetpgrp (shell_terminal) != (shell_pgrp = getpgrp ()))
3366 kill (- shell_pgrp, SIGTTIN);
3368 /* Ignore interactive and job-control signals. */
3369 signal(SIGINT, SIG_IGN);
3370 signal(SIGQUIT, SIG_IGN);
3371 signal(SIGTERM, SIG_IGN);
3372 signal(SIGTSTP, SIG_IGN);
3373 signal(SIGTTIN, SIG_IGN);
3374 signal(SIGTTOU, SIG_IGN);
3375 signal(SIGCHLD, SIG_IGN);
3377 /* Put ourselves in our own process group. */
3379 shell_pgrp = getpid ();
3380 setpgid (shell_pgrp, shell_pgrp);
3382 /* Grab control of the terminal. */
3383 tcsetpgrp(shell_terminal, shell_pgrp);
3386 int hush_main(int argc, char * const *argv)
3392 /* XXX what should these be while sourcing /etc/profile? */
3396 /* (re?) initialize globals. Sometimes hush_main() ends up calling
3397 * hush_main(), therefore we cannot rely on the BSS to zero out this
3398 * stuff. Reset these to 0 every time. */
3400 /* map[] is taken care of with call to update_ifs_map() */
3403 close_me_head = NULL;
3408 /* Initialize some more globals to non-zero values */
3410 #ifdef CONFIG_FEATURE_COMMAND_EDITING
3411 cmdedit_set_initial_prompt();
3417 /* initialize our shell local variables with the values
3418 * currently living in the environment */
3421 set_local_var(*e, 2); /* without call putenv() */
3424 last_return_code=EXIT_SUCCESS;
3427 if (argv[0] && argv[0][0] == '-') {
3428 debug_printf("\nsourcing /etc/profile\n");
3429 if ((input = fopen("/etc/profile", "r")) != NULL) {
3430 mark_open(fileno(input));
3431 parse_file_outer(input);
3432 mark_closed(fileno(input));
3438 while ((opt = getopt(argc, argv, "c:xif")) > 0) {
3442 global_argv = argv+optind;
3443 global_argc = argc-optind;
3444 opt = parse_string_outer(optarg, FLAG_PARSE_SEMICOLON);
3456 fprintf(stderr, "Usage: sh [FILE]...\n"
3457 " or: sh -c command [args]...\n\n");
3464 /* A shell is interactive if the `-i' flag was given, or if all of
3465 * the following conditions are met:
3467 * no arguments remaining or the -s flag given
3468 * standard input is a terminal
3469 * standard output is a terminal
3470 * Refer to Posix.2, the description of the `sh' utility. */
3471 if (argv[optind]==NULL && input==stdin &&
3472 isatty(fileno(stdin)) && isatty(fileno(stdout))) {
3476 debug_printf("\ninteractive=%d\n", interactive);
3478 /* Looks like they want an interactive shell */
3479 #ifndef CONFIG_FEATURE_SH_EXTRA_QUIET
3480 printf( "\n\n" BB_BANNER " hush - the humble shell v0.01 (testing)\n");
3481 printf( "Enter 'help' for a list of built-in commands.\n\n");
3483 setup_job_control();
3486 if (argv[optind]==NULL) {
3487 opt=parse_file_outer(stdin);
3491 debug_printf("\nrunning script '%s'\n", argv[optind]);
3492 global_argv = argv+optind;
3493 global_argc = argc-optind;
3494 input = xfopen(argv[optind], "r");
3495 opt = parse_file_outer(input);
3497 #ifdef CONFIG_FEATURE_CLEAN_UP
3499 if (cwd && cwd != unknown)
3502 struct variables *cur, *tmp;
3503 for(cur = top_vars; cur; cur = tmp) {
3505 if (!cur->flg_read_only) {
3515 return(opt?opt:last_return_code);
3519 static char *insert_var_value(char *inp)
3521 return insert_var_value_sub(inp, 0);
3524 static char *insert_var_value_sub(char *inp, int tag_subst)
3526 int res_str_len = 0;
3529 char *p, *p1, *res_str = NULL;
3531 while ((p = strchr(inp, SPECIAL_VAR_SYMBOL))) {
3532 /* check the beginning of the string for normal characters */
3534 /* copy any characters to the result string */
3536 res_str = xrealloc(res_str, (res_str_len + len));
3537 strncpy((res_str + res_str_len), inp, len);
3541 /* find the ending marker */
3542 p = strchr(inp, SPECIAL_VAR_SYMBOL);
3544 /* look up the value to substitute */
3545 if ((p1 = lookup_param(inp))) {
3547 len = res_str_len + strlen(p1) + 2;
3549 len = res_str_len + strlen(p1);
3550 res_str = xrealloc(res_str, (1 + len));
3553 * copy the variable value to the result
3556 strcpy((res_str + res_str_len + 1), p1);
3559 * mark the replaced text to be accepted as
3562 res_str[res_str_len] = SUBSTED_VAR_SYMBOL;
3563 res_str[res_str_len + 1 + strlen(p1)] =
3567 * copy the variable value to the result
3570 strcpy((res_str + res_str_len), p1);
3574 *p = SPECIAL_VAR_SYMBOL;
3579 res_str = xrealloc(res_str, (1 + res_str_len + strlen(inp)));
3580 strcpy((res_str + res_str_len), inp);
3581 while ((p = strchr(res_str, '\n'))) {
3585 return (res_str == NULL) ? inp : res_str;
3588 static char **make_list_in(char **inp, char *name)
3591 int name_len = strlen(name);
3596 /* create list of variable values */
3597 list = xmalloc(sizeof(*list));
3598 for (i = 0; inp[i]; i++) {
3599 p3 = insert_var_value(inp[i]);
3606 if ((p2 = strchr(p1, ' '))) {
3612 /* we use n + 2 in realloc for list,because we add
3613 * new element and then we will add NULL element */
3614 list = xrealloc(list, sizeof(*list) * (n + 2));
3615 list[n] = xmalloc(2 + name_len + len);
3616 strcpy(list[n], name);
3617 strcat(list[n], "=");
3618 strncat(list[n], p1, len);
3619 list[n++][name_len + len + 1] = '\0';
3622 if (p3 != inp[i]) free(p3);
3629 * Make new string for parser
3630 * inp - array of argument strings to flatten
3631 * nonnull - indicates argument was quoted when originally parsed
3633 static char *make_string(char **inp, int *nonnull)
3642 noeval_str = get_local_var("HUSH_NO_EVAL");
3643 if (noeval_str != NULL && *noeval_str != '0' && *noeval_str != '\0')
3645 for (n = 0; inp[n]; n++) {
3646 p = insert_var_value_sub(inp[n], noeval);
3647 str = xrealloc(str, (len + strlen(p) + (2 * nonnull[n])));
3658 len = strlen(str) + 3;
3659 if (p != inp[n]) free(p);
3662 *(str + len) = '\n';
3663 *(str + len + 1) = '\0';
3668 static int do_showvar(cmd_tbl_t *cmdtp, int flag, int argc,
3669 char * const argv[])
3673 struct variables *cur;
3675 if (argc == 1) { /* Print all env variables */
3676 for (cur = top_vars; cur; cur = cur->next) {
3677 printf ("%s=%s\n", cur->name, cur->value);
3679 puts ("\n ** Abort\n");
3685 for (i = 1; i < argc; ++i) { /* print single env variables */
3686 char *name = argv[i];
3689 for (cur = top_vars; cur; cur = cur->next) {
3690 if(strcmp (cur->name, name) == 0) {
3692 printf ("%s=%s\n", cur->name, cur->value);
3695 puts ("\n ** Abort\n");
3700 printf ("## Error: \"%s\" not defined\n", name);
3708 showvar, CONFIG_SYS_MAXARGS, 1, do_showvar,
3709 "print local hushshell variables",
3710 "\n - print values of all hushshell variables\n"
3711 "showvar name ...\n"
3712 " - print value of hushshell variable 'name'"
3716 /****************************************************************************/