blob: 8b6cbe7c90957483fb9510aaf05e55487c6c2171 [file] [log] [blame]
Eric Andersen25f27032001-04-26 23:22:31 +00001/* vi: set sw=4 ts=4: */
2/*
3 * sh.c -- a prototype Bourne shell grammar parser
4 * Intended to follow the original Thompson and Ritchie
5 * "small and simple is beautiful" philosophy, which
6 * incidentally is a good match to today's BusyBox.
7 *
8 * Copyright (C) 2000,2001 Larry Doolittle <larry@doolittle.boa.org>
9 *
10 * Credits:
11 * The parser routines proper are all original material, first
Eric Andersencb81e642003-07-14 21:21:08 +000012 * written Dec 2000 and Jan 2001 by Larry Doolittle. The
13 * execution engine, the builtins, and much of the underlying
14 * support has been adapted from busybox-0.49pre's lash, which is
Eric Andersenc7bda1c2004-03-15 08:29:22 +000015 * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
Eric Andersencb81e642003-07-14 21:21:08 +000016 * written by Erik Andersen <andersen@codepoet.org>. That, in turn,
17 * is based in part on ladsh.c, by Michael K. Johnson and Erik W.
18 * Troan, which they placed in the public domain. I don't know
19 * how much of the Johnson/Troan code has survived the repeated
20 * rewrites.
21 *
Eric Andersen25f27032001-04-26 23:22:31 +000022 * Other credits:
23 * simple_itoa() was lifted from boa-0.93.15
24 * b_addchr() derived from similar w_addchar function in glibc-2.2
25 * setup_redirect(), redirect_opt_num(), and big chunks of main()
26 * and many builtins derived from contributions by Erik Andersen
27 * miscellaneous bugfixes from Matt Kraai
28 *
29 * There are two big (and related) architecture differences between
30 * this parser and the lash parser. One is that this version is
31 * actually designed from the ground up to understand nearly all
32 * of the Bourne grammar. The second, consequential change is that
33 * the parser and input reader have been turned inside out. Now,
34 * the parser is in control, and asks for input as needed. The old
35 * way had the input reader in control, and it asked for parsing to
36 * take place as needed. The new way makes it much easier to properly
37 * handle the recursion implicit in the various substitutions, especially
38 * across continuation lines.
39 *
40 * Bash grammar not implemented: (how many of these were in original sh?)
41 * $@ (those sure look like weird quoting rules)
42 * $_
43 * ! negation operator for pipes
44 * &> and >& redirection of stdout+stderr
45 * Brace Expansion
46 * Tilde Expansion
47 * fancy forms of Parameter Expansion
Eric Andersen78a7c992001-05-15 16:30:25 +000048 * aliases
Eric Andersen25f27032001-04-26 23:22:31 +000049 * Arithmetic Expansion
50 * <(list) and >(list) Process Substitution
Eric Andersen83a2ae22001-05-07 17:59:25 +000051 * reserved words: case, esac, select, function
Eric Andersen25f27032001-04-26 23:22:31 +000052 * Here Documents ( << word )
53 * Functions
54 * Major bugs:
55 * job handling woefully incomplete and buggy
56 * reserved word execution woefully incomplete and buggy
Eric Andersen25f27032001-04-26 23:22:31 +000057 * to-do:
Eric Andersen83a2ae22001-05-07 17:59:25 +000058 * port selected bugfixes from post-0.49 busybox lash - done?
59 * finish implementing reserved words: for, while, until, do, done
60 * change { and } from special chars to reserved words
61 * builtins: break, continue, eval, return, set, trap, ulimit
62 * test magic exec
Eric Andersen25f27032001-04-26 23:22:31 +000063 * handle children going into background
64 * clean up recognition of null pipes
Eric Andersen25f27032001-04-26 23:22:31 +000065 * check setting of global_argc and global_argv
66 * control-C handling, probably with longjmp
Eric Andersen25f27032001-04-26 23:22:31 +000067 * follow IFS rules more precisely, including update semantics
Eric Andersen25f27032001-04-26 23:22:31 +000068 * figure out what to do with backslash-newline
69 * explain why we use signal instead of sigaction
70 * propagate syntax errors, die on resource errors?
71 * continuation lines, both explicit and implicit - done?
72 * memory leak finding and plugging - done?
73 * more testing, especially quoting rules and redirection
Eric Andersen78a7c992001-05-15 16:30:25 +000074 * document how quoting rules not precisely followed for variable assignments
Eric Andersen25f27032001-04-26 23:22:31 +000075 * maybe change map[] to use 2-bit entries
76 * (eventually) remove all the printf's
Eric Andersen25f27032001-04-26 23:22:31 +000077 *
Bernhard Reutner-Fischer86f5c992006-01-22 22:55:11 +000078 * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
Eric Andersen25f27032001-04-26 23:22:31 +000079 */
80#include <ctype.h> /* isalpha, isdigit */
81#include <unistd.h> /* getpid */
82#include <stdlib.h> /* getenv, atoi */
83#include <string.h> /* strchr */
84#include <stdio.h> /* popen etc. */
85#include <glob.h> /* glob, of course */
86#include <stdarg.h> /* va_list */
87#include <errno.h>
88#include <fcntl.h>
89#include <getopt.h> /* should be pretty obvious */
90
Eric Andersen83a2ae22001-05-07 17:59:25 +000091#include <sys/stat.h> /* ulimit */
Eric Andersen25f27032001-04-26 23:22:31 +000092#include <sys/types.h>
93#include <sys/wait.h>
94#include <signal.h>
95
96/* #include <dmalloc.h> */
Eric Andersen4ed5e372001-05-01 01:49:50 +000097/* #define DEBUG_SHELL */
Eric Andersen25f27032001-04-26 23:22:31 +000098
Eric Andersenda15a492002-12-06 21:37:08 +000099#if 1
Eric Andersen25f27032001-04-26 23:22:31 +0000100#include "busybox.h"
101#include "cmdedit.h"
102#else
Manuel Novoa III cad53642003-03-19 09:13:01 +0000103#define bb_applet_name "hush"
Eric Andersenaf44a0e2001-04-27 07:26:12 +0000104#include "standalone.h"
Matt Kraai2d91deb2001-08-01 17:21:35 +0000105#define hush_main main
Eric Andersenbdfd0d72001-10-24 05:00:29 +0000106#undef CONFIG_FEATURE_SH_FANCY_PROMPT
107#define BB_BANNER
Eric Andersenaf44a0e2001-04-27 07:26:12 +0000108#endif
Eric Andersen4c9b68f2002-04-13 12:33:41 +0000109#define SPECIAL_VAR_SYMBOL 03
110#define FLAG_EXIT_FROM_LOOP 1
111#define FLAG_PARSE_SEMICOLON (1 << 1) /* symbol ';' is special for parser */
112#define FLAG_REPARSING (1 << 2) /* >=2nd pass */
Eric Andersen25f27032001-04-26 23:22:31 +0000113
114typedef enum {
115 REDIRECT_INPUT = 1,
116 REDIRECT_OVERWRITE = 2,
117 REDIRECT_APPEND = 3,
118 REDIRECT_HEREIS = 4,
119 REDIRECT_IO = 5
120} redir_type;
121
122/* The descrip member of this structure is only used to make debugging
123 * output pretty */
"Vladimir N. Oleynik"485d7cb2005-10-17 09:48:57 +0000124static const struct {int mode; int default_fd; const char *descrip;} redir_table[] = {
Eric Andersen25f27032001-04-26 23:22:31 +0000125 { 0, 0, "()" },
126 { O_RDONLY, 0, "<" },
127 { O_CREAT|O_TRUNC|O_WRONLY, 1, ">" },
128 { O_CREAT|O_APPEND|O_WRONLY, 1, ">>" },
129 { O_RDONLY, -1, "<<" },
130 { O_RDWR, 1, "<>" }
131};
132
133typedef enum {
134 PIPE_SEQ = 1,
135 PIPE_AND = 2,
136 PIPE_OR = 3,
137 PIPE_BG = 4,
138} pipe_style;
139
140/* might eventually control execution */
141typedef enum {
142 RES_NONE = 0,
143 RES_IF = 1,
144 RES_THEN = 2,
145 RES_ELIF = 3,
146 RES_ELSE = 4,
147 RES_FI = 5,
148 RES_FOR = 6,
149 RES_WHILE = 7,
150 RES_UNTIL = 8,
151 RES_DO = 9,
152 RES_DONE = 10,
Eric Andersenaf44a0e2001-04-27 07:26:12 +0000153 RES_XXXX = 11,
Eric Andersen4c9b68f2002-04-13 12:33:41 +0000154 RES_IN = 12,
155 RES_SNTX = 13
Eric Andersen25f27032001-04-26 23:22:31 +0000156} reserved_style;
157#define FLAG_END (1<<RES_NONE)
158#define FLAG_IF (1<<RES_IF)
159#define FLAG_THEN (1<<RES_THEN)
160#define FLAG_ELIF (1<<RES_ELIF)
161#define FLAG_ELSE (1<<RES_ELSE)
162#define FLAG_FI (1<<RES_FI)
163#define FLAG_FOR (1<<RES_FOR)
164#define FLAG_WHILE (1<<RES_WHILE)
165#define FLAG_UNTIL (1<<RES_UNTIL)
166#define FLAG_DO (1<<RES_DO)
167#define FLAG_DONE (1<<RES_DONE)
Eric Andersen4c9b68f2002-04-13 12:33:41 +0000168#define FLAG_IN (1<<RES_IN)
Eric Andersen25f27032001-04-26 23:22:31 +0000169#define FLAG_START (1<<RES_XXXX)
170
171/* This holds pointers to the various results of parsing */
172struct p_context {
173 struct child_prog *child;
174 struct pipe *list_head;
175 struct pipe *pipe;
176 struct redir_struct *pending_redirect;
177 reserved_style w;
178 int old_flag; /* for figuring out valid reserved words */
179 struct p_context *stack;
Eric Andersen4c9b68f2002-04-13 12:33:41 +0000180 int type; /* define type of parser : ";$" common or special symbol */
Eric Andersen25f27032001-04-26 23:22:31 +0000181 /* How about quoting status? */
182};
183
184struct redir_struct {
185 redir_type type; /* type of redirection */
186 int fd; /* file descriptor being redirected */
187 int dup; /* -1, or file descriptor being duplicated */
Eric Andersenc7bda1c2004-03-15 08:29:22 +0000188 struct redir_struct *next; /* pointer to the next redirect in the list */
Eric Andersen25f27032001-04-26 23:22:31 +0000189 glob_t word; /* *word.gl_pathv is the filename */
190};
191
192struct child_prog {
193 pid_t pid; /* 0 if exited */
194 char **argv; /* program name and arguments */
195 struct pipe *group; /* if non-NULL, first in group or subshell */
196 int subshell; /* flag, non-zero if group must be forked */
197 struct redir_struct *redirects; /* I/O redirections */
198 glob_t glob_result; /* result of parameter globbing */
199 int is_stopped; /* is the program currently running? */
200 struct pipe *family; /* pointer back to the child's parent pipe */
Eric Andersen4c9b68f2002-04-13 12:33:41 +0000201 int sp; /* number of SPECIAL_VAR_SYMBOL */
202 int type;
Eric Andersen25f27032001-04-26 23:22:31 +0000203};
204
205struct pipe {
206 int jobid; /* job number */
207 int num_progs; /* total number of programs in job */
208 int running_progs; /* number of programs running */
209 char *text; /* name of job */
210 char *cmdbuf; /* buffer various argv's point into */
211 pid_t pgrp; /* process group ID for the job */
212 struct child_prog *progs; /* array of commands in pipe */
213 struct pipe *next; /* to track background commands */
214 int stopped_progs; /* number of programs alive, but stopped */
215 int job_context; /* bitmask defining current context */
216 pipe_style followup; /* PIPE_BG, PIPE_SEQ, PIPE_OR, PIPE_AND */
217 reserved_style r_mode; /* supports if, for, while, until */
Eric Andersen25f27032001-04-26 23:22:31 +0000218};
219
Eric Andersen25f27032001-04-26 23:22:31 +0000220struct close_me {
221 int fd;
222 struct close_me *next;
223};
224
Eric Andersen9ffb7dd2001-05-19 03:00:46 +0000225struct variables {
226 char *name;
227 char *value;
228 int flg_export;
229 int flg_read_only;
230 struct variables *next;
231};
232
Eric Andersen25f27032001-04-26 23:22:31 +0000233/* globals, connect us to the outside world
234 * the first three support $?, $#, and $1 */
"Vladimir N. Oleynik"19c37012005-09-22 14:33:15 +0000235static char **global_argv;
"Vladimir N. Oleynik"4ccd2b42006-01-31 09:27:48 +0000236static int global_argc;
237static int last_return_code;
Eric Andersen25f27032001-04-26 23:22:31 +0000238extern char **environ; /* This is in <unistd.h>, but protected with __USE_GNU */
Eric Andersenc7bda1c2004-03-15 08:29:22 +0000239
Eric Andersen25f27032001-04-26 23:22:31 +0000240/* "globals" within this file */
Eric Andersenbc604a22001-05-16 05:24:03 +0000241static char *ifs;
"Vladimir N. Oleynik"4ccd2b42006-01-31 09:27:48 +0000242static unsigned char map[256];
Eric Andersenbc604a22001-05-16 05:24:03 +0000243static int fake_mode;
244static int interactive;
245static struct close_me *close_me_head;
Eric Andersencfa88ec2001-05-11 18:08:16 +0000246static const char *cwd;
Eric Andersenc798b072001-06-22 06:23:03 +0000247static struct pipe *job_list;
Eric Andersenbc604a22001-05-16 05:24:03 +0000248static unsigned int last_bg_pid;
"Vladimir N. Oleynik"4ccd2b42006-01-31 09:27:48 +0000249static int last_jobid;
Eric Andersen6c947d22001-06-25 22:24:38 +0000250static unsigned int shell_terminal;
Eric Andersen25f27032001-04-26 23:22:31 +0000251static char *PS1;
Eric Andersen94ac2442001-05-22 19:05:18 +0000252static char *PS2;
"Vladimir N. Oleynik"19c37012005-09-22 14:33:15 +0000253static struct variables shell_ver = { "HUSH_VERSION", "0.01", 1, 1, 0 };
254static struct variables *top_vars = &shell_ver;
Eric Andersen25f27032001-04-26 23:22:31 +0000255
Eric Andersen52a97ca2001-06-22 06:49:26 +0000256
Eric Andersen25f27032001-04-26 23:22:31 +0000257#define B_CHUNK (100)
258#define B_NOSPAC 1
Eric Andersen25f27032001-04-26 23:22:31 +0000259
260typedef struct {
261 char *data;
262 int length;
263 int maxlen;
264 int quote;
265 int nonnull;
266} o_string;
267#define NULL_O_STRING {NULL,0,0,0,0}
268/* used for initialization:
269 o_string foo = NULL_O_STRING; */
270
271/* I can almost use ordinary FILE *. Is open_memstream() universally
272 * available? Where is it documented? */
273struct in_str {
274 const char *p;
Matt Kraaibdd4ece2001-05-23 17:43:00 +0000275 char peek_buf[2];
Eric Andersen25f27032001-04-26 23:22:31 +0000276 int __promptme;
277 int promptmode;
278 FILE *file;
279 int (*get) (struct in_str *);
280 int (*peek) (struct in_str *);
281};
282#define b_getch(input) ((input)->get(input))
283#define b_peek(input) ((input)->peek(input))
284
285#define JOB_STATUS_FORMAT "[%d] %-22s %.40s\n"
286
287struct built_in_command {
"Vladimir N. Oleynik"485d7cb2005-10-17 09:48:57 +0000288 const char *cmd; /* name */
289 const char *descr; /* description */
Eric Andersen25f27032001-04-26 23:22:31 +0000290 int (*function) (struct child_prog *); /* function ptr */
291};
292
293/* belongs in busybox.h */
294static inline int max(int a, int b) {
295 return (a>b)?a:b;
296}
297
298/* This should be in utility.c */
299#ifdef DEBUG_SHELL
300static void debug_printf(const char *format, ...)
301{
302 va_list args;
303 va_start(args, format);
304 vfprintf(stderr, format, args);
305 va_end(args);
306}
307#else
"Vladimir N. Oleynik"4ccd2b42006-01-31 09:27:48 +0000308static inline void debug_printf(const char *format ATTRIBUTE_UNUSED, ...) { }
Eric Andersen25f27032001-04-26 23:22:31 +0000309#endif
310#define final_printf debug_printf
311
Eric Andersen9ffb7dd2001-05-19 03:00:46 +0000312static void __syntax(char *file, int line) {
Manuel Novoa III cad53642003-03-19 09:13:01 +0000313 bb_error_msg("syntax error %s:%d", file, line);
Eric Andersen25f27032001-04-26 23:22:31 +0000314}
315#define syntax() __syntax(__FILE__, __LINE__)
316
317/* Index of subroutines: */
318/* function prototypes for builtins */
319static int builtin_cd(struct child_prog *child);
320static int builtin_env(struct child_prog *child);
Eric Andersen4c9b68f2002-04-13 12:33:41 +0000321static int builtin_eval(struct child_prog *child);
Eric Andersen25f27032001-04-26 23:22:31 +0000322static int builtin_exec(struct child_prog *child);
323static int builtin_exit(struct child_prog *child);
324static int builtin_export(struct child_prog *child);
325static int builtin_fg_bg(struct child_prog *child);
326static int builtin_help(struct child_prog *child);
327static int builtin_jobs(struct child_prog *child);
328static int builtin_pwd(struct child_prog *child);
329static int builtin_read(struct child_prog *child);
Eric Andersenf72f5622001-05-15 23:21:41 +0000330static int builtin_set(struct child_prog *child);
Eric Andersen25f27032001-04-26 23:22:31 +0000331static int builtin_shift(struct child_prog *child);
332static int builtin_source(struct child_prog *child);
Eric Andersen25f27032001-04-26 23:22:31 +0000333static int builtin_umask(struct child_prog *child);
334static int builtin_unset(struct child_prog *child);
Eric Andersen83a2ae22001-05-07 17:59:25 +0000335static int builtin_not_written(struct child_prog *child);
Eric Andersen25f27032001-04-26 23:22:31 +0000336/* o_string manipulation: */
337static int b_check_space(o_string *o, int len);
338static int b_addchr(o_string *o, int ch);
339static void b_reset(o_string *o);
340static int b_addqchr(o_string *o, int ch, int quote);
341static int b_adduint(o_string *o, unsigned int i);
342/* in_str manipulations: */
343static int static_get(struct in_str *i);
344static int static_peek(struct in_str *i);
345static int file_get(struct in_str *i);
346static int file_peek(struct in_str *i);
347static void setup_file_in_str(struct in_str *i, FILE *f);
348static void setup_string_in_str(struct in_str *i, const char *s);
349/* close_me manipulations: */
350static void mark_open(int fd);
351static void mark_closed(int fd);
Eric Anderseneaecbf32001-10-31 10:41:31 +0000352static void close_all(void);
Eric Andersen25f27032001-04-26 23:22:31 +0000353/* "run" the final data structures: */
354static char *indenter(int i);
Eric Andersenbf7df042001-05-23 22:18:35 +0000355static int free_pipe_list(struct pipe *head, int indent);
356static int free_pipe(struct pipe *pi, int indent);
Eric Andersen25f27032001-04-26 23:22:31 +0000357/* really run the final data structures: */
358static int setup_redirects(struct child_prog *prog, int squirrel[]);
Eric Andersen25f27032001-04-26 23:22:31 +0000359static int run_list_real(struct pipe *pi);
Bernhard Reutner-Fischer86f5c992006-01-22 22:55:11 +0000360static void pseudo_exec(struct child_prog *child) ATTRIBUTE_NORETURN;
Eric Andersen25f27032001-04-26 23:22:31 +0000361static int run_pipe_real(struct pipe *pi);
362/* extended glob support: */
363static int globhack(const char *src, int flags, glob_t *pglob);
364static int glob_needed(const char *s);
365static int xglob(o_string *dest, int flags, glob_t *pglob);
Eric Andersen78a7c992001-05-15 16:30:25 +0000366/* variable assignment: */
Eric Andersen78a7c992001-05-15 16:30:25 +0000367static int is_assignment(const char *s);
Eric Andersen25f27032001-04-26 23:22:31 +0000368/* data structure manipulation: */
369static int setup_redirect(struct p_context *ctx, int fd, redir_type style, struct in_str *input);
370static void initialize_context(struct p_context *ctx);
371static int done_word(o_string *dest, struct p_context *ctx);
372static int done_command(struct p_context *ctx);
373static int done_pipe(struct p_context *ctx, pipe_style type);
374/* primary string parsing: */
375static int redirect_dup_num(struct in_str *input);
376static int redirect_opt_num(o_string *o);
377static int process_command_subs(o_string *dest, struct p_context *ctx, struct in_str *input, int subst_end);
378static int parse_group(o_string *dest, struct p_context *ctx, struct in_str *input, int ch);
Eric Andersen4c9b68f2002-04-13 12:33:41 +0000379static char *lookup_param(char *src);
380static char *make_string(char **inp);
Eric Andersen25f27032001-04-26 23:22:31 +0000381static int handle_dollar(o_string *dest, struct p_context *ctx, struct in_str *input);
382static int parse_string(o_string *dest, struct p_context *ctx, const char *src);
383static int parse_stream(o_string *dest, struct p_context *ctx, struct in_str *input0, int end_trigger);
384/* setup: */
Eric Andersen4c9b68f2002-04-13 12:33:41 +0000385static int parse_stream_outer(struct in_str *inp, int flag);
386static int parse_string_outer(const char *s, int flag);
Eric Andersen25f27032001-04-26 23:22:31 +0000387static int parse_file_outer(FILE *f);
Eric Andersenbafd94f2001-05-02 16:11:59 +0000388/* job management: */
Eric Andersenc798b072001-06-22 06:23:03 +0000389static int checkjobs(struct pipe* fg_pipe);
Eric Andersenbafd94f2001-05-02 16:11:59 +0000390static void insert_bg_job(struct pipe *pi);
391static void remove_bg_job(struct pipe *pi);
Eric Andersenf72f5622001-05-15 23:21:41 +0000392/* local variable support */
Eric Andersen4c9b68f2002-04-13 12:33:41 +0000393static char **make_list_in(char **inp, char *name);
394static char *insert_var_value(char *inp);
Eric Andersenf72f5622001-05-15 23:21:41 +0000395static char *get_local_var(const char *var);
Eric Andersenf72f5622001-05-15 23:21:41 +0000396static void unset_local_var(const char *name);
Eric Andersen9ffb7dd2001-05-19 03:00:46 +0000397static int set_local_var(const char *s, int flg_export);
Eric Andersen25f27032001-04-26 23:22:31 +0000398
399/* Table of built-in functions. They can be forked or not, depending on
400 * context: within pipes, they fork. As simple commands, they do not.
401 * When used in non-forking context, they can change global variables
402 * in the parent shell process. If forked, of course they can not.
403 * For example, 'unset foo | whatever' will parse and run, but foo will
404 * still be set at the end. */
"Vladimir N. Oleynik"485d7cb2005-10-17 09:48:57 +0000405static const struct built_in_command bltins[] = {
Eric Andersen25f27032001-04-26 23:22:31 +0000406 {"bg", "Resume a job in the background", builtin_fg_bg},
Eric Andersen83a2ae22001-05-07 17:59:25 +0000407 {"break", "Exit for, while or until loop", builtin_not_written},
Eric Andersen25f27032001-04-26 23:22:31 +0000408 {"cd", "Change working directory", builtin_cd},
Eric Andersen83a2ae22001-05-07 17:59:25 +0000409 {"continue", "Continue for, while or until loop", builtin_not_written},
Eric Andersen25f27032001-04-26 23:22:31 +0000410 {"env", "Print all environment variables", builtin_env},
Eric Andersen4c9b68f2002-04-13 12:33:41 +0000411 {"eval", "Construct and run shell command", builtin_eval},
Eric Andersenc7bda1c2004-03-15 08:29:22 +0000412 {"exec", "Exec command, replacing this shell with the exec'd process",
Eric Andersenf72f5622001-05-15 23:21:41 +0000413 builtin_exec},
Eric Andersen25f27032001-04-26 23:22:31 +0000414 {"exit", "Exit from shell()", builtin_exit},
415 {"export", "Set environment variable", builtin_export},
416 {"fg", "Bring job into the foreground", builtin_fg_bg},
417 {"jobs", "Lists the active jobs", builtin_jobs},
418 {"pwd", "Print current directory", builtin_pwd},
419 {"read", "Input environment variable", builtin_read},
Eric Andersen83a2ae22001-05-07 17:59:25 +0000420 {"return", "Return from a function", builtin_not_written},
Eric Andersenf72f5622001-05-15 23:21:41 +0000421 {"set", "Set/unset shell local variables", builtin_set},
Eric Andersen25f27032001-04-26 23:22:31 +0000422 {"shift", "Shift positional parameters", builtin_shift},
Eric Andersen83a2ae22001-05-07 17:59:25 +0000423 {"trap", "Trap signals", builtin_not_written},
424 {"ulimit","Controls resource limits", builtin_not_written},
Eric Andersen25f27032001-04-26 23:22:31 +0000425 {"umask","Sets file creation mask", builtin_umask},
426 {"unset", "Unset environment variable", builtin_unset},
427 {".", "Source-in and run commands in a file", builtin_source},
428 {"help", "List shell built-in commands", builtin_help},
429 {NULL, NULL, NULL}
430};
431
Eric Andersen9ffb7dd2001-05-19 03:00:46 +0000432static const char *set_cwd(void)
433{
Manuel Novoa III cad53642003-03-19 09:13:01 +0000434 if(cwd==bb_msg_unknown)
Eric Andersen9ffb7dd2001-05-19 03:00:46 +0000435 cwd = NULL; /* xgetcwd(arg) called free(arg) */
436 cwd = xgetcwd((char *)cwd);
437 if (!cwd)
Manuel Novoa III cad53642003-03-19 09:13:01 +0000438 cwd = bb_msg_unknown;
Eric Andersen9ffb7dd2001-05-19 03:00:46 +0000439 return cwd;
440}
441
Eric Andersen4c9b68f2002-04-13 12:33:41 +0000442/* built-in 'eval' handler */
443static int builtin_eval(struct child_prog *child)
444{
445 char *str = NULL;
446 int rcode = EXIT_SUCCESS;
Eric Andersenc7bda1c2004-03-15 08:29:22 +0000447
Eric Andersen4c9b68f2002-04-13 12:33:41 +0000448 if (child->argv[1]) {
449 str = make_string(child->argv + 1);
Eric Andersenc7bda1c2004-03-15 08:29:22 +0000450 parse_string_outer(str, FLAG_EXIT_FROM_LOOP |
Eric Andersen4c9b68f2002-04-13 12:33:41 +0000451 FLAG_PARSE_SEMICOLON);
452 free(str);
453 rcode = last_return_code;
454 }
455 return rcode;
456}
Eric Andersen9ffb7dd2001-05-19 03:00:46 +0000457
Eric Andersen25f27032001-04-26 23:22:31 +0000458/* built-in 'cd <path>' handler */
459static int builtin_cd(struct child_prog *child)
460{
461 char *newdir;
462 if (child->argv[1] == NULL)
463 newdir = getenv("HOME");
464 else
465 newdir = child->argv[1];
466 if (chdir(newdir)) {
467 printf("cd: %s: %s\n", newdir, strerror(errno));
468 return EXIT_FAILURE;
469 }
Eric Andersen9ffb7dd2001-05-19 03:00:46 +0000470 set_cwd();
Eric Andersen25f27032001-04-26 23:22:31 +0000471 return EXIT_SUCCESS;
472}
473
474/* built-in 'env' handler */
"Vladimir N. Oleynik"4ccd2b42006-01-31 09:27:48 +0000475static int builtin_env(struct child_prog *dummy ATTRIBUTE_UNUSED)
Eric Andersen25f27032001-04-26 23:22:31 +0000476{
477 char **e = environ;
478 if (e == NULL) return EXIT_FAILURE;
479 for (; *e; e++) {
480 puts(*e);
481 }
482 return EXIT_SUCCESS;
483}
484
485/* built-in 'exec' handler */
486static int builtin_exec(struct child_prog *child)
487{
488 if (child->argv[1] == NULL)
489 return EXIT_SUCCESS; /* Really? */
490 child->argv++;
491 pseudo_exec(child);
492 /* never returns */
493}
494
495/* built-in 'exit' handler */
496static int builtin_exit(struct child_prog *child)
497{
498 if (child->argv[1] == NULL)
Eric Andersene67c3ce2001-05-02 02:09:36 +0000499 exit(last_return_code);
Eric Andersen25f27032001-04-26 23:22:31 +0000500 exit (atoi(child->argv[1]));
501}
502
503/* built-in 'export VAR=value' handler */
504static int builtin_export(struct child_prog *child)
505{
Eric Andersen9ffb7dd2001-05-19 03:00:46 +0000506 int res = 0;
507 char *name = child->argv[1];
Eric Andersen25f27032001-04-26 23:22:31 +0000508
Eric Andersenf72f5622001-05-15 23:21:41 +0000509 if (name == NULL) {
Eric Andersen25f27032001-04-26 23:22:31 +0000510 return (builtin_env(child));
511 }
Eric Andersenf72f5622001-05-15 23:21:41 +0000512
Eric Andersen9ffb7dd2001-05-19 03:00:46 +0000513 name = strdup(name);
Eric Andersenf72f5622001-05-15 23:21:41 +0000514
Eric Andersen9ffb7dd2001-05-19 03:00:46 +0000515 if(name) {
Eric Andersen94ac2442001-05-22 19:05:18 +0000516 char *value = strchr(name, '=');
Eric Andersen9ffb7dd2001-05-19 03:00:46 +0000517
Eric Andersen94ac2442001-05-22 19:05:18 +0000518 if (!value) {
519 char *tmp;
520 /* They are exporting something without an =VALUE */
Eric Andersen9ffb7dd2001-05-19 03:00:46 +0000521
Eric Andersen94ac2442001-05-22 19:05:18 +0000522 value = get_local_var(name);
523 if (value) {
524 size_t ln = strlen(name);
Eric Andersen9ffb7dd2001-05-19 03:00:46 +0000525
Eric Andersen94ac2442001-05-22 19:05:18 +0000526 tmp = realloc(name, ln+strlen(value)+2);
527 if(tmp==NULL)
528 res = -1;
529 else {
530 sprintf(tmp+ln, "=%s", value);
531 name = tmp;
532 }
533 } else {
534 /* bash does not return an error when trying to export
535 * an undefined variable. Do likewise. */
536 res = 1;
Eric Andersen9ffb7dd2001-05-19 03:00:46 +0000537 }
Eric Andersen9ffb7dd2001-05-19 03:00:46 +0000538 }
Eric Andersen9ffb7dd2001-05-19 03:00:46 +0000539 }
540 if (res<0)
Manuel Novoa III cad53642003-03-19 09:13:01 +0000541 bb_perror_msg("export");
Eric Andersen9ffb7dd2001-05-19 03:00:46 +0000542 else if(res==0)
543 res = set_local_var(name, 1);
544 else
545 res = 0;
546 free(name);
547 return res;
Eric Andersen25f27032001-04-26 23:22:31 +0000548}
549
550/* built-in 'fg' and 'bg' handler */
551static int builtin_fg_bg(struct child_prog *child)
552{
Eric Andersen0fcd4472001-05-02 20:12:03 +0000553 int i, jobnum;
554 struct pipe *pi=NULL;
Eric Andersen25f27032001-04-26 23:22:31 +0000555
Eric Andersenc798b072001-06-22 06:23:03 +0000556 if (!interactive)
557 return EXIT_FAILURE;
Eric Andersen0fcd4472001-05-02 20:12:03 +0000558 /* If they gave us no args, assume they want the last backgrounded task */
559 if (!child->argv[1]) {
Eric Andersenc798b072001-06-22 06:23:03 +0000560 for (pi = job_list; pi; pi = pi->next) {
561 if (pi->jobid == last_jobid) {
Eric Andersen0fcd4472001-05-02 20:12:03 +0000562 break;
563 }
564 }
565 if (!pi) {
Manuel Novoa III cad53642003-03-19 09:13:01 +0000566 bb_error_msg("%s: no current job", child->argv[0]);
Eric Andersen0fcd4472001-05-02 20:12:03 +0000567 return EXIT_FAILURE;
568 }
569 } else {
570 if (sscanf(child->argv[1], "%%%d", &jobnum) != 1) {
Manuel Novoa III cad53642003-03-19 09:13:01 +0000571 bb_error_msg("%s: bad argument '%s'", child->argv[0], child->argv[1]);
Eric Andersen0fcd4472001-05-02 20:12:03 +0000572 return EXIT_FAILURE;
573 }
Eric Andersenc798b072001-06-22 06:23:03 +0000574 for (pi = job_list; pi; pi = pi->next) {
Eric Andersen0fcd4472001-05-02 20:12:03 +0000575 if (pi->jobid == jobnum) {
576 break;
577 }
578 }
579 if (!pi) {
Manuel Novoa III cad53642003-03-19 09:13:01 +0000580 bb_error_msg("%s: %d: no such job", child->argv[0], jobnum);
Eric Andersen0fcd4472001-05-02 20:12:03 +0000581 return EXIT_FAILURE;
Eric Andersen25f27032001-04-26 23:22:31 +0000582 }
583 }
Eric Andersen52a97ca2001-06-22 06:49:26 +0000584
Eric Andersen25f27032001-04-26 23:22:31 +0000585 if (*child->argv[0] == 'f') {
Eric Andersen028b65b2001-06-28 01:10:11 +0000586 /* Put the job into the foreground. */
587 tcsetpgrp(shell_terminal, pi->pgrp);
Eric Andersen25f27032001-04-26 23:22:31 +0000588 }
589
590 /* Restart the processes in the job */
Eric Andersen0fcd4472001-05-02 20:12:03 +0000591 for (i = 0; i < pi->num_progs; i++)
592 pi->progs[i].is_stopped = 0;
Eric Andersen25f27032001-04-26 23:22:31 +0000593
Eric Andersen028b65b2001-06-28 01:10:11 +0000594 if ( (i=kill(- pi->pgrp, SIGCONT)) < 0) {
595 if (i == ESRCH) {
596 remove_bg_job(pi);
597 } else {
Manuel Novoa III cad53642003-03-19 09:13:01 +0000598 bb_perror_msg("kill (SIGCONT)");
Eric Andersen028b65b2001-06-28 01:10:11 +0000599 }
600 }
Eric Andersen25f27032001-04-26 23:22:31 +0000601
Eric Andersen0fcd4472001-05-02 20:12:03 +0000602 pi->stopped_progs = 0;
Eric Andersen25f27032001-04-26 23:22:31 +0000603 return EXIT_SUCCESS;
604}
605
606/* built-in 'help' handler */
"Vladimir N. Oleynik"4ccd2b42006-01-31 09:27:48 +0000607static int builtin_help(struct child_prog *dummy ATTRIBUTE_UNUSED)
Eric Andersen25f27032001-04-26 23:22:31 +0000608{
"Vladimir N. Oleynik"485d7cb2005-10-17 09:48:57 +0000609 const struct built_in_command *x;
Eric Andersen25f27032001-04-26 23:22:31 +0000610
611 printf("\nBuilt-in commands:\n");
612 printf("-------------------\n");
613 for (x = bltins; x->cmd; x++) {
614 if (x->descr==NULL)
615 continue;
616 printf("%s\t%s\n", x->cmd, x->descr);
617 }
618 printf("\n\n");
619 return EXIT_SUCCESS;
620}
621
622/* built-in 'jobs' handler */
"Vladimir N. Oleynik"4ccd2b42006-01-31 09:27:48 +0000623static int builtin_jobs(struct child_prog *child ATTRIBUTE_UNUSED)
Eric Andersen25f27032001-04-26 23:22:31 +0000624{
625 struct pipe *job;
626 char *status_string;
627
Eric Andersenc798b072001-06-22 06:23:03 +0000628 for (job = job_list; job; job = job->next) {
Eric Andersen25f27032001-04-26 23:22:31 +0000629 if (job->running_progs == job->stopped_progs)
630 status_string = "Stopped";
631 else
632 status_string = "Running";
Eric Andersen52a97ca2001-06-22 06:49:26 +0000633
Eric Andersen25f27032001-04-26 23:22:31 +0000634 printf(JOB_STATUS_FORMAT, job->jobid, status_string, job->text);
635 }
636 return EXIT_SUCCESS;
637}
638
639
640/* built-in 'pwd' handler */
"Vladimir N. Oleynik"4ccd2b42006-01-31 09:27:48 +0000641static int builtin_pwd(struct child_prog *dummy ATTRIBUTE_UNUSED)
Eric Andersen25f27032001-04-26 23:22:31 +0000642{
Eric Andersen9ffb7dd2001-05-19 03:00:46 +0000643 puts(set_cwd());
Eric Andersen25f27032001-04-26 23:22:31 +0000644 return EXIT_SUCCESS;
645}
646
647/* built-in 'read VAR' handler */
648static int builtin_read(struct child_prog *child)
649{
Eric Andersen9ffb7dd2001-05-19 03:00:46 +0000650 int res;
Eric Andersen25f27032001-04-26 23:22:31 +0000651
652 if (child->argv[1]) {
Eric Andersen9ffb7dd2001-05-19 03:00:46 +0000653 char string[BUFSIZ];
654 char *var = 0;
Eric Andersen25f27032001-04-26 23:22:31 +0000655
Eric Andersen94ac2442001-05-22 19:05:18 +0000656 string[0] = 0; /* In case stdin has only EOF */
Eric Andersen9ffb7dd2001-05-19 03:00:46 +0000657 /* read string */
658 fgets(string, sizeof(string), stdin);
659 chomp(string);
660 var = malloc(strlen(child->argv[1])+strlen(string)+2);
661 if(var) {
662 sprintf(var, "%s=%s", child->argv[1], string);
663 res = set_local_var(var, 0);
664 } else
Eric Andersen94ac2442001-05-22 19:05:18 +0000665 res = -1;
Eric Andersen9ffb7dd2001-05-19 03:00:46 +0000666 if (res)
667 fprintf(stderr, "read: %m\n");
Eric Andersen94ac2442001-05-22 19:05:18 +0000668 free(var); /* So not move up to avoid breaking errno */
Eric Andersen9ffb7dd2001-05-19 03:00:46 +0000669 return res;
670 } else {
671 do res=getchar(); while(res!='\n' && res!=EOF);
672 return 0;
673 }
Eric Andersen25f27032001-04-26 23:22:31 +0000674}
675
Eric Andersenf72f5622001-05-15 23:21:41 +0000676/* built-in 'set VAR=value' handler */
677static int builtin_set(struct child_prog *child)
678{
Eric Andersenf72f5622001-05-15 23:21:41 +0000679 char *temp = child->argv[1];
Eric Andersen9ffb7dd2001-05-19 03:00:46 +0000680 struct variables *e;
Eric Andersenf72f5622001-05-15 23:21:41 +0000681
Eric Andersen9ffb7dd2001-05-19 03:00:46 +0000682 if (temp == NULL)
683 for(e = top_vars; e; e=e->next)
684 printf("%s=%s\n", e->name, e->value);
685 else
686 set_local_var(temp, 0);
687
Eric Andersenf72f5622001-05-15 23:21:41 +0000688 return EXIT_SUCCESS;
Eric Andersenf72f5622001-05-15 23:21:41 +0000689}
690
691
Eric Andersen25f27032001-04-26 23:22:31 +0000692/* Built-in 'shift' handler */
693static int builtin_shift(struct child_prog *child)
694{
695 int n=1;
696 if (child->argv[1]) {
697 n=atoi(child->argv[1]);
698 }
699 if (n>=0 && n<global_argc) {
700 /* XXX This probably breaks $0 */
701 global_argc -= n;
702 global_argv += n;
703 return EXIT_SUCCESS;
704 } else {
705 return EXIT_FAILURE;
706 }
707}
708
709/* Built-in '.' handler (read-in and execute commands from file) */
710static int builtin_source(struct child_prog *child)
711{
712 FILE *input;
713 int status;
714
715 if (child->argv[1] == NULL)
716 return EXIT_FAILURE;
717
718 /* XXX search through $PATH is missing */
719 input = fopen(child->argv[1], "r");
720 if (!input) {
Manuel Novoa III cad53642003-03-19 09:13:01 +0000721 bb_error_msg("Couldn't open file '%s'", child->argv[1]);
Eric Andersen25f27032001-04-26 23:22:31 +0000722 return EXIT_FAILURE;
723 }
724
725 /* Now run the file */
726 /* XXX argv and argc are broken; need to save old global_argv
727 * (pointer only is OK!) on this stack frame,
728 * set global_argv=child->argv+1, recurse, and restore. */
729 mark_open(fileno(input));
730 status = parse_file_outer(input);
731 mark_closed(fileno(input));
732 fclose(input);
733 return (status);
734}
735
Eric Andersen25f27032001-04-26 23:22:31 +0000736static int builtin_umask(struct child_prog *child)
737{
Eric Andersen83a2ae22001-05-07 17:59:25 +0000738 mode_t new_umask;
739 const char *arg = child->argv[1];
740 char *end;
741 if (arg) {
742 new_umask=strtoul(arg, &end, 8);
743 if (*end!='\0' || end == arg) {
744 return EXIT_FAILURE;
745 }
746 } else {
747 printf("%.3o\n", (unsigned int) (new_umask=umask(0)));
748 }
749 umask(new_umask);
750 return EXIT_SUCCESS;
Eric Andersen25f27032001-04-26 23:22:31 +0000751}
752
753/* built-in 'unset VAR' handler */
754static int builtin_unset(struct child_prog *child)
755{
Eric Andersen9ffb7dd2001-05-19 03:00:46 +0000756 /* bash returned already true */
Eric Andersenf72f5622001-05-15 23:21:41 +0000757 unset_local_var(child->argv[1]);
Eric Andersen25f27032001-04-26 23:22:31 +0000758 return EXIT_SUCCESS;
759}
760
Eric Andersen83a2ae22001-05-07 17:59:25 +0000761static int builtin_not_written(struct child_prog *child)
762{
763 printf("builtin_%s not written\n",child->argv[0]);
764 return EXIT_FAILURE;
765}
766
Eric Andersen25f27032001-04-26 23:22:31 +0000767static int b_check_space(o_string *o, int len)
768{
769 /* It would be easy to drop a more restrictive policy
770 * in here, such as setting a maximum string length */
771 if (o->length + len > o->maxlen) {
772 char *old_data = o->data;
773 /* assert (data == NULL || o->maxlen != 0); */
774 o->maxlen += max(2*len, B_CHUNK);
775 o->data = realloc(o->data, 1 + o->maxlen);
776 if (o->data == NULL) {
777 free(old_data);
778 }
779 }
780 return o->data == NULL;
781}
782
783static int b_addchr(o_string *o, int ch)
784{
785 debug_printf("b_addchr: %c %d %p\n", ch, o->length, o);
786 if (b_check_space(o, 1)) return B_NOSPAC;
787 o->data[o->length] = ch;
788 o->length++;
789 o->data[o->length] = '\0';
790 return 0;
791}
792
793static void b_reset(o_string *o)
794{
795 o->length = 0;
796 o->nonnull = 0;
797 if (o->data != NULL) *o->data = '\0';
798}
799
800static void b_free(o_string *o)
801{
802 b_reset(o);
Aaron Lehmanna170e1c2002-11-28 11:27:31 +0000803 free(o->data);
Eric Andersen25f27032001-04-26 23:22:31 +0000804 o->data = NULL;
805 o->maxlen = 0;
806}
807
808/* My analysis of quoting semantics tells me that state information
809 * is associated with a destination, not a source.
810 */
811static int b_addqchr(o_string *o, int ch, int quote)
812{
813 if (quote && strchr("*?[\\",ch)) {
814 int rc;
815 rc = b_addchr(o, '\\');
816 if (rc) return rc;
817 }
818 return b_addchr(o, ch);
819}
820
821/* belongs in utility.c */
"Vladimir N. Oleynik"19c37012005-09-22 14:33:15 +0000822static char *simple_itoa(unsigned int i)
Eric Andersen25f27032001-04-26 23:22:31 +0000823{
824 /* 21 digits plus null terminator, good for 64-bit or smaller ints */
825 static char local[22];
826 char *p = &local[21];
827 *p-- = '\0';
828 do {
829 *p-- = '0' + i % 10;
830 i /= 10;
831 } while (i > 0);
832 return p + 1;
833}
834
835static int b_adduint(o_string *o, unsigned int i)
836{
837 int r;
838 char *p = simple_itoa(i);
839 /* no escape checking necessary */
840 do r=b_addchr(o, *p++); while (r==0 && *p);
841 return r;
842}
843
844static int static_get(struct in_str *i)
845{
846 int ch=*i->p++;
847 if (ch=='\0') return EOF;
848 return ch;
849}
850
851static int static_peek(struct in_str *i)
852{
853 return *i->p;
854}
855
856static inline void cmdedit_set_initial_prompt(void)
857{
Eric Andersenbdfd0d72001-10-24 05:00:29 +0000858#ifndef CONFIG_FEATURE_SH_FANCY_PROMPT
Eric Andersen25f27032001-04-26 23:22:31 +0000859 PS1 = NULL;
860#else
861 PS1 = getenv("PS1");
862 if(PS1==0)
863 PS1 = "\\w \\$ ";
Eric Andersenc7bda1c2004-03-15 08:29:22 +0000864#endif
Eric Andersen25f27032001-04-26 23:22:31 +0000865}
866
867static inline void setup_prompt_string(int promptmode, char **prompt_str)
868{
Eric Andersenaf44a0e2001-04-27 07:26:12 +0000869 debug_printf("setup_prompt_string %d ",promptmode);
Eric Andersenbdfd0d72001-10-24 05:00:29 +0000870#ifndef CONFIG_FEATURE_SH_FANCY_PROMPT
Eric Andersen25f27032001-04-26 23:22:31 +0000871 /* Set up the prompt */
872 if (promptmode == 1) {
Aaron Lehmanna170e1c2002-11-28 11:27:31 +0000873 free(PS1);
Eric Andersen25f27032001-04-26 23:22:31 +0000874 PS1=xmalloc(strlen(cwd)+4);
875 sprintf(PS1, "%s %s", cwd, ( geteuid() != 0 ) ? "$ ":"# ");
876 *prompt_str = PS1;
877 } else {
878 *prompt_str = PS2;
879 }
880#else
Glenn L McGrath78b0e372001-06-26 02:06:08 +0000881 *prompt_str = (promptmode==1)? PS1 : PS2;
Eric Andersenaf44a0e2001-04-27 07:26:12 +0000882#endif
883 debug_printf("result %s\n",*prompt_str);
Eric Andersen25f27032001-04-26 23:22:31 +0000884}
885
886static void get_user_input(struct in_str *i)
887{
888 char *prompt_str;
Eric Andersen088875f2001-04-27 07:49:41 +0000889 static char the_command[BUFSIZ];
Eric Andersen25f27032001-04-26 23:22:31 +0000890
891 setup_prompt_string(i->promptmode, &prompt_str);
Eric Andersenbdfd0d72001-10-24 05:00:29 +0000892#ifdef CONFIG_FEATURE_COMMAND_EDITING
Eric Andersen25f27032001-04-26 23:22:31 +0000893 /*
894 ** enable command line editing only while a command line
895 ** is actually being read; otherwise, we'll end up bequeathing
896 ** atexit() handlers and other unwanted stuff to our
897 ** child processes (rob@sysgo.de)
898 */
899 cmdedit_read_input(prompt_str, the_command);
Eric Andersen25f27032001-04-26 23:22:31 +0000900#else
901 fputs(prompt_str, stdout);
902 fflush(stdout);
903 the_command[0]=fgetc(i->file);
904 the_command[1]='\0';
905#endif
Eric Andersen4f6753e2001-05-31 17:17:12 +0000906 fflush(stdout);
Eric Andersen25f27032001-04-26 23:22:31 +0000907 i->p = the_command;
908}
909
Eric Andersenc7bda1c2004-03-15 08:29:22 +0000910/* This is the magic location that prints prompts
Eric Andersen25f27032001-04-26 23:22:31 +0000911 * and gets data back from the user */
912static int file_get(struct in_str *i)
913{
914 int ch;
915
916 ch = 0;
917 /* If there is data waiting, eat it up */
918 if (i->p && *i->p) {
919 ch=*i->p++;
920 } else {
921 /* need to double check i->file because we might be doing something
922 * more complicated by now, like sourcing or substituting. */
923 if (i->__promptme && interactive && i->file == stdin) {
Eric Andersen4f6753e2001-05-31 17:17:12 +0000924 while(! i->p || (interactive && strlen(i->p)==0) ) {
925 get_user_input(i);
926 }
Eric Andersen25f27032001-04-26 23:22:31 +0000927 i->promptmode=2;
Eric Andersene67c3ce2001-05-02 02:09:36 +0000928 i->__promptme = 0;
929 if (i->p && *i->p) {
930 ch=*i->p++;
931 }
Eric Andersen4ed5e372001-05-01 01:49:50 +0000932 } else {
Eric Andersene67c3ce2001-05-02 02:09:36 +0000933 ch = fgetc(i->file);
Eric Andersen25f27032001-04-26 23:22:31 +0000934 }
Eric Andersen4ed5e372001-05-01 01:49:50 +0000935
Eric Andersen25f27032001-04-26 23:22:31 +0000936 debug_printf("b_getch: got a %d\n", ch);
937 }
938 if (ch == '\n') i->__promptme=1;
939 return ch;
940}
941
942/* All the callers guarantee this routine will never be
943 * used right after a newline, so prompting is not needed.
944 */
945static int file_peek(struct in_str *i)
946{
947 if (i->p && *i->p) {
948 return *i->p;
949 } else {
Matt Kraaibdd4ece2001-05-23 17:43:00 +0000950 i->peek_buf[0] = fgetc(i->file);
951 i->peek_buf[1] = '\0';
952 i->p = i->peek_buf;
Eric Andersen25f27032001-04-26 23:22:31 +0000953 debug_printf("b_peek: got a %d\n", *i->p);
Matt Kraaibdd4ece2001-05-23 17:43:00 +0000954 return *i->p;
Eric Andersen25f27032001-04-26 23:22:31 +0000955 }
956}
957
958static void setup_file_in_str(struct in_str *i, FILE *f)
959{
960 i->peek = file_peek;
961 i->get = file_get;
962 i->__promptme=1;
963 i->promptmode=1;
964 i->file = f;
965 i->p = NULL;
966}
967
968static void setup_string_in_str(struct in_str *i, const char *s)
969{
970 i->peek = static_peek;
971 i->get = static_get;
972 i->__promptme=1;
973 i->promptmode=1;
974 i->p = s;
975}
976
977static void mark_open(int fd)
978{
979 struct close_me *new = xmalloc(sizeof(struct close_me));
980 new->fd = fd;
981 new->next = close_me_head;
982 close_me_head = new;
983}
984
985static void mark_closed(int fd)
986{
987 struct close_me *tmp;
988 if (close_me_head == NULL || close_me_head->fd != fd)
Manuel Novoa III cad53642003-03-19 09:13:01 +0000989 bb_error_msg_and_die("corrupt close_me");
Eric Andersen25f27032001-04-26 23:22:31 +0000990 tmp = close_me_head;
991 close_me_head = close_me_head->next;
992 free(tmp);
993}
994
Eric Anderseneaecbf32001-10-31 10:41:31 +0000995static void close_all(void)
Eric Andersen25f27032001-04-26 23:22:31 +0000996{
997 struct close_me *c;
998 for (c=close_me_head; c; c=c->next) {
999 close(c->fd);
1000 }
1001 close_me_head = NULL;
1002}
1003
1004/* squirrel != NULL means we squirrel away copies of stdin, stdout,
1005 * and stderr if they are redirected. */
1006static int setup_redirects(struct child_prog *prog, int squirrel[])
1007{
1008 int openfd, mode;
1009 struct redir_struct *redir;
1010
1011 for (redir=prog->redirects; redir; redir=redir->next) {
Eric Andersen817e73c2001-06-06 17:56:09 +00001012 if (redir->dup == -1 && redir->word.gl_pathv == NULL) {
1013 /* something went wrong in the parse. Pretend it didn't happen */
1014 continue;
1015 }
Eric Andersen25f27032001-04-26 23:22:31 +00001016 if (redir->dup == -1) {
1017 mode=redir_table[redir->type].mode;
1018 openfd = open(redir->word.gl_pathv[0], mode, 0666);
1019 if (openfd < 0) {
1020 /* this could get lost if stderr has been redirected, but
1021 bash and ash both lose it as well (though zsh doesn't!) */
Manuel Novoa III cad53642003-03-19 09:13:01 +00001022 bb_perror_msg("error opening %s", redir->word.gl_pathv[0]);
Eric Andersen25f27032001-04-26 23:22:31 +00001023 return 1;
1024 }
1025 } else {
1026 openfd = redir->dup;
1027 }
1028
1029 if (openfd != redir->fd) {
1030 if (squirrel && redir->fd < 3) {
1031 squirrel[redir->fd] = dup(redir->fd);
1032 }
Eric Andersen83a2ae22001-05-07 17:59:25 +00001033 if (openfd == -3) {
1034 close(openfd);
1035 } else {
1036 dup2(openfd, redir->fd);
Matt Kraaic616e532001-06-05 16:50:08 +00001037 if (redir->dup == -1)
1038 close (openfd);
Eric Andersen83a2ae22001-05-07 17:59:25 +00001039 }
Eric Andersen25f27032001-04-26 23:22:31 +00001040 }
1041 }
1042 return 0;
1043}
1044
1045static void restore_redirects(int squirrel[])
1046{
1047 int i, fd;
1048 for (i=0; i<3; i++) {
1049 fd = squirrel[i];
1050 if (fd != -1) {
1051 /* No error checking. I sure wouldn't know what
1052 * to do with an error if I found one! */
1053 dup2(fd, i);
1054 close(fd);
1055 }
1056 }
1057}
1058
Eric Andersenada18ff2001-05-21 16:18:22 +00001059/* never returns */
Eric Andersen94ac2442001-05-22 19:05:18 +00001060/* XXX no exit() here. If you don't exec, use _exit instead.
1061 * The at_exit handlers apparently confuse the calling process,
1062 * in particular stdin handling. Not sure why? */
Eric Andersen25f27032001-04-26 23:22:31 +00001063static void pseudo_exec(struct child_prog *child)
1064{
Eric Andersen78a7c992001-05-15 16:30:25 +00001065 int i, rcode;
Eric Andersen4c9b68f2002-04-13 12:33:41 +00001066 char *p;
"Vladimir N. Oleynik"485d7cb2005-10-17 09:48:57 +00001067 const struct built_in_command *x;
Eric Andersen25f27032001-04-26 23:22:31 +00001068 if (child->argv) {
Eric Andersen78a7c992001-05-15 16:30:25 +00001069 for (i=0; is_assignment(child->argv[i]); i++) {
Eric Andersenada18ff2001-05-21 16:18:22 +00001070 debug_printf("pid %d environment modification: %s\n",getpid(),child->argv[i]);
Eric Andersen4c9b68f2002-04-13 12:33:41 +00001071 p = insert_var_value(child->argv[i]);
1072 putenv(strdup(p));
1073 if (p != child->argv[i]) free(p);
Eric Andersen78a7c992001-05-15 16:30:25 +00001074 }
1075 child->argv+=i; /* XXX this hack isn't so horrible, since we are about
1076 to exit, and therefore don't need to keep data
1077 structures consistent for free() use. */
1078 /* If a variable is assigned in a forest, and nobody listens,
1079 * was it ever really set?
1080 */
Eric Andersen94ac2442001-05-22 19:05:18 +00001081 if (child->argv[0] == NULL) {
1082 _exit(EXIT_SUCCESS);
1083 }
Eric Andersen78a7c992001-05-15 16:30:25 +00001084
Eric Andersen25f27032001-04-26 23:22:31 +00001085 /*
1086 * Check if the command matches any of the builtins.
1087 * Depending on context, this might be redundant. But it's
1088 * easier to waste a few CPU cycles than it is to figure out
1089 * if this is one of those cases.
1090 */
1091 for (x = bltins; x->cmd; x++) {
1092 if (strcmp(child->argv[0], x->cmd) == 0 ) {
1093 debug_printf("builtin exec %s\n", child->argv[0]);
Eric Andersen57e6a492001-05-22 22:34:51 +00001094 rcode = x->function(child);
1095 fflush(stdout);
1096 _exit(rcode);
Eric Andersen25f27032001-04-26 23:22:31 +00001097 }
1098 }
Eric Andersenaac75e52001-04-30 18:18:45 +00001099
1100 /* Check if the command matches any busybox internal commands
Eric Andersenc7bda1c2004-03-15 08:29:22 +00001101 * ("applets") here.
Eric Andersenaac75e52001-04-30 18:18:45 +00001102 * FIXME: This feature is not 100% safe, since
1103 * BusyBox is not fully reentrant, so we have no guarantee the things
1104 * from the .bss are still zeroed, or that things from .data are still
1105 * at their defaults. We could exec ourself from /proc/self/exe, but I
1106 * really dislike relying on /proc for things. We could exec ourself
1107 * from global_argv[0], but if we are in a chroot, we may not be able
Eric Andersenc7bda1c2004-03-15 08:29:22 +00001108 * to find ourself... */
Eric Andersenbdfd0d72001-10-24 05:00:29 +00001109#ifdef CONFIG_FEATURE_SH_STANDALONE_SHELL
Eric Andersenaac75e52001-04-30 18:18:45 +00001110 {
1111 int argc_l;
1112 char** argv_l=child->argv;
1113 char *name = child->argv[0];
1114
Eric Andersenaac75e52001-04-30 18:18:45 +00001115 /* Count argc for use in a second... */
1116 for(argc_l=0;*argv_l!=NULL; argv_l++, argc_l++);
1117 optind = 1;
1118 debug_printf("running applet %s\n", name);
1119 run_applet_by_name(name, argc_l, child->argv);
Eric Andersenaac75e52001-04-30 18:18:45 +00001120 }
1121#endif
Eric Andersen25f27032001-04-26 23:22:31 +00001122 debug_printf("exec of %s\n",child->argv[0]);
1123 execvp(child->argv[0],child->argv);
Manuel Novoa III cad53642003-03-19 09:13:01 +00001124 bb_perror_msg("couldn't exec: %s",child->argv[0]);
Eric Andersen94ac2442001-05-22 19:05:18 +00001125 _exit(1);
Eric Andersen25f27032001-04-26 23:22:31 +00001126 } else if (child->group) {
1127 debug_printf("runtime nesting to group\n");
1128 interactive=0; /* crucial!!!! */
1129 rcode = run_list_real(child->group);
Eric Andersenbf7df042001-05-23 22:18:35 +00001130 /* OK to leak memory by not calling free_pipe_list,
Eric Andersen25f27032001-04-26 23:22:31 +00001131 * since this process is about to exit */
Eric Andersen94ac2442001-05-22 19:05:18 +00001132 _exit(rcode);
Eric Andersen25f27032001-04-26 23:22:31 +00001133 } else {
1134 /* Can happen. See what bash does with ">foo" by itself. */
1135 debug_printf("trying to pseudo_exec null command\n");
Eric Andersen94ac2442001-05-22 19:05:18 +00001136 _exit(EXIT_SUCCESS);
Eric Andersen25f27032001-04-26 23:22:31 +00001137 }
1138}
1139
Eric Andersenbafd94f2001-05-02 16:11:59 +00001140static void insert_bg_job(struct pipe *pi)
1141{
1142 struct pipe *thejob;
1143
1144 /* Linear search for the ID of the job to use */
1145 pi->jobid = 1;
Eric Andersenc798b072001-06-22 06:23:03 +00001146 for (thejob = job_list; thejob; thejob = thejob->next)
Eric Andersenbafd94f2001-05-02 16:11:59 +00001147 if (thejob->jobid >= pi->jobid)
1148 pi->jobid = thejob->jobid + 1;
1149
1150 /* add thejob to the list of running jobs */
Eric Andersenc798b072001-06-22 06:23:03 +00001151 if (!job_list) {
Eric Andersen52a97ca2001-06-22 06:49:26 +00001152 thejob = job_list = xmalloc(sizeof(*thejob));
Eric Andersenbafd94f2001-05-02 16:11:59 +00001153 } else {
Eric Andersenc798b072001-06-22 06:23:03 +00001154 for (thejob = job_list; thejob->next; thejob = thejob->next) /* nothing */;
Eric Andersenbafd94f2001-05-02 16:11:59 +00001155 thejob->next = xmalloc(sizeof(*thejob));
1156 thejob = thejob->next;
1157 }
1158
1159 /* physically copy the struct job */
Eric Andersen0fcd4472001-05-02 20:12:03 +00001160 memcpy(thejob, pi, sizeof(struct pipe));
Eric Andersenbafd94f2001-05-02 16:11:59 +00001161 thejob->next = NULL;
1162 thejob->running_progs = thejob->num_progs;
1163 thejob->stopped_progs = 0;
Eric Andersen9ffb7dd2001-05-19 03:00:46 +00001164 thejob->text = xmalloc(BUFSIZ); /* cmdedit buffer size */
Eric Andersen1a6d39b2001-05-08 05:11:54 +00001165
1166 //if (pi->progs[0] && pi->progs[0].argv && pi->progs[0].argv[0])
1167 {
1168 char *bar=thejob->text;
1169 char **foo=pi->progs[0].argv;
1170 while(foo && *foo) {
1171 bar += sprintf(bar, "%s ", *foo++);
1172 }
1173 }
Eric Andersenbafd94f2001-05-02 16:11:59 +00001174
Eric Andersenc7bda1c2004-03-15 08:29:22 +00001175 /* we don't wait for background thejobs to return -- append it
Eric Andersenbafd94f2001-05-02 16:11:59 +00001176 to the list of backgrounded thejobs and leave it alone */
Eric Andersen1a6d39b2001-05-08 05:11:54 +00001177 printf("[%d] %d\n", thejob->jobid, thejob->progs[0].pid);
1178 last_bg_pid = thejob->progs[0].pid;
Eric Andersenc798b072001-06-22 06:23:03 +00001179 last_jobid = thejob->jobid;
Eric Andersenbafd94f2001-05-02 16:11:59 +00001180}
1181
Eric Andersenc798b072001-06-22 06:23:03 +00001182/* remove a backgrounded job */
Eric Andersenbafd94f2001-05-02 16:11:59 +00001183static void remove_bg_job(struct pipe *pi)
1184{
1185 struct pipe *prev_pipe;
1186
Eric Andersenc798b072001-06-22 06:23:03 +00001187 if (pi == job_list) {
Eric Andersen52a97ca2001-06-22 06:49:26 +00001188 job_list = pi->next;
Eric Andersenbafd94f2001-05-02 16:11:59 +00001189 } else {
Eric Andersenc798b072001-06-22 06:23:03 +00001190 prev_pipe = job_list;
Eric Andersenbafd94f2001-05-02 16:11:59 +00001191 while (prev_pipe->next != pi)
1192 prev_pipe = prev_pipe->next;
1193 prev_pipe->next = pi->next;
1194 }
Eric Andersen028b65b2001-06-28 01:10:11 +00001195 if (job_list)
1196 last_jobid = job_list->jobid;
1197 else
1198 last_jobid = 0;
1199
Eric Andersen52a97ca2001-06-22 06:49:26 +00001200 pi->stopped_progs = 0;
Eric Andersenbf7df042001-05-23 22:18:35 +00001201 free_pipe(pi, 0);
Eric Andersenbafd94f2001-05-02 16:11:59 +00001202 free(pi);
1203}
1204
Eric Andersenc7bda1c2004-03-15 08:29:22 +00001205/* Checks to see if any processes have exited -- if they
Eric Andersenbafd94f2001-05-02 16:11:59 +00001206 have, figure out why and see if a job has completed */
Eric Andersenc798b072001-06-22 06:23:03 +00001207static int checkjobs(struct pipe* fg_pipe)
Eric Andersenbafd94f2001-05-02 16:11:59 +00001208{
Eric Andersenc798b072001-06-22 06:23:03 +00001209 int attributes;
1210 int status;
Eric Andersenbafd94f2001-05-02 16:11:59 +00001211 int prognum = 0;
1212 struct pipe *pi;
1213 pid_t childpid;
1214
Eric Andersenc798b072001-06-22 06:23:03 +00001215 attributes = WUNTRACED;
1216 if (fg_pipe==NULL) {
1217 attributes |= WNOHANG;
1218 }
1219
1220 while ((childpid = waitpid(-1, &status, attributes)) > 0) {
1221 if (fg_pipe) {
1222 int i, rcode = 0;
1223 for (i=0; i < fg_pipe->num_progs; i++) {
1224 if (fg_pipe->progs[i].pid == childpid) {
Eric Andersenc7bda1c2004-03-15 08:29:22 +00001225 if (i==fg_pipe->num_progs-1)
Eric Andersenc798b072001-06-22 06:23:03 +00001226 rcode=WEXITSTATUS(status);
1227 (fg_pipe->num_progs)--;
1228 return(rcode);
1229 }
1230 }
1231 }
1232
1233 for (pi = job_list; pi; pi = pi->next) {
Eric Andersenbafd94f2001-05-02 16:11:59 +00001234 prognum = 0;
Eric Andersen52a97ca2001-06-22 06:49:26 +00001235 while (prognum < pi->num_progs && pi->progs[prognum].pid != childpid) {
1236 prognum++;
1237 }
Eric Andersenbafd94f2001-05-02 16:11:59 +00001238 if (prognum < pi->num_progs)
1239 break;
1240 }
1241
Eric Andersen99785762001-05-22 21:37:48 +00001242 if(pi==NULL) {
1243 debug_printf("checkjobs: pid %d was not in our list!\n", childpid);
1244 continue;
1245 }
Eric Andersenaeb44c42001-05-22 20:29:00 +00001246
Eric Andersenbafd94f2001-05-02 16:11:59 +00001247 if (WIFEXITED(status) || WIFSIGNALED(status)) {
1248 /* child exited */
1249 pi->running_progs--;
1250 pi->progs[prognum].pid = 0;
1251
1252 if (!pi->running_progs) {
1253 printf(JOB_STATUS_FORMAT, pi->jobid, "Done", pi->text);
1254 remove_bg_job(pi);
1255 }
1256 } else {
1257 /* child stopped */
1258 pi->stopped_progs++;
1259 pi->progs[prognum].is_stopped = 1;
1260
Eric Andersen52a97ca2001-06-22 06:49:26 +00001261#if 0
1262 /* Printing this stuff is a pain, since it tends to
1263 * overwrite the prompt an inconveinient moments. So
1264 * don't do that. */
Eric Andersenbafd94f2001-05-02 16:11:59 +00001265 if (pi->stopped_progs == pi->num_progs) {
Eric Andersen52a97ca2001-06-22 06:49:26 +00001266 printf("\n"JOB_STATUS_FORMAT, pi->jobid, "Stopped", pi->text);
Eric Andersenbafd94f2001-05-02 16:11:59 +00001267 }
Eric Andersenc7bda1c2004-03-15 08:29:22 +00001268#endif
Eric Andersenbafd94f2001-05-02 16:11:59 +00001269 }
1270 }
1271
Matt Kraai80abc452001-05-02 21:48:17 +00001272 if (childpid == -1 && errno != ECHILD)
Manuel Novoa III cad53642003-03-19 09:13:01 +00001273 bb_perror_msg("waitpid");
Matt Kraai80abc452001-05-02 21:48:17 +00001274
Eric Andersenbafd94f2001-05-02 16:11:59 +00001275 /* move the shell to the foreground */
Eric Andersen028b65b2001-06-28 01:10:11 +00001276 //if (interactive && tcsetpgrp(shell_terminal, getpgid(0)))
Manuel Novoa III cad53642003-03-19 09:13:01 +00001277 // bb_perror_msg("tcsetpgrp-2");
Eric Andersenc798b072001-06-22 06:23:03 +00001278 return -1;
Eric Andersenada18ff2001-05-21 16:18:22 +00001279}
1280
1281/* Figure out our controlling tty, checking in order stderr,
1282 * stdin, and stdout. If check_pgrp is set, also check that
1283 * we belong to the foreground process group associated with
Eric Andersen6c947d22001-06-25 22:24:38 +00001284 * that tty. The value of shell_terminal is needed in order to call
1285 * tcsetpgrp(shell_terminal, ...); */
"Vladimir N. Oleynik"19c37012005-09-22 14:33:15 +00001286#if 0
1287static void controlling_tty(int check_pgrp)
Eric Andersenada18ff2001-05-21 16:18:22 +00001288{
1289 pid_t curpgrp;
Eric Andersenada18ff2001-05-21 16:18:22 +00001290
Eric Andersen6c947d22001-06-25 22:24:38 +00001291 if ((curpgrp = tcgetpgrp(shell_terminal = 2)) < 0
1292 && (curpgrp = tcgetpgrp(shell_terminal = 0)) < 0
1293 && (curpgrp = tcgetpgrp(shell_terminal = 1)) < 0)
1294 goto shell_terminal_error;
Eric Andersenada18ff2001-05-21 16:18:22 +00001295
Eric Andersenc798b072001-06-22 06:23:03 +00001296 if (check_pgrp && curpgrp != getpgid(0))
Eric Andersen6c947d22001-06-25 22:24:38 +00001297 goto shell_terminal_error;
Eric Andersenada18ff2001-05-21 16:18:22 +00001298
Eric Andersenc798b072001-06-22 06:23:03 +00001299 return;
1300
Eric Andersen6c947d22001-06-25 22:24:38 +00001301shell_terminal_error:
1302 shell_terminal = -1;
Eric Andersenc798b072001-06-22 06:23:03 +00001303 return;
Eric Andersenbafd94f2001-05-02 16:11:59 +00001304}
"Vladimir N. Oleynik"19c37012005-09-22 14:33:15 +00001305#endif
Eric Andersenbafd94f2001-05-02 16:11:59 +00001306
Eric Andersen25f27032001-04-26 23:22:31 +00001307/* run_pipe_real() starts all the jobs, but doesn't wait for anything
Eric Andersenc798b072001-06-22 06:23:03 +00001308 * to finish. See checkjobs().
Eric Andersen25f27032001-04-26 23:22:31 +00001309 *
1310 * return code is normally -1, when the caller has to wait for children
1311 * to finish to determine the exit status of the pipe. If the pipe
1312 * is a simple builtin command, however, the action is done by the
1313 * time run_pipe_real returns, and the exit code is provided as the
1314 * return value.
1315 *
1316 * The input of the pipe is always stdin, the output is always
1317 * stdout. The outpipe[] mechanism in BusyBox-0.48 lash is bogus,
1318 * because it tries to avoid running the command substitution in
1319 * subshell, when that is in fact necessary. The subshell process
1320 * now has its stdout directed to the input of the appropriate pipe,
1321 * so this routine is noticeably simpler.
1322 */
1323static int run_pipe_real(struct pipe *pi)
1324{
1325 int i;
1326 int nextin, nextout;
1327 int pipefds[2]; /* pipefds[0] is for reading */
1328 struct child_prog *child;
"Vladimir N. Oleynik"485d7cb2005-10-17 09:48:57 +00001329 const struct built_in_command *x;
Eric Andersen4c9b68f2002-04-13 12:33:41 +00001330 char *p;
Eric Andersen25f27032001-04-26 23:22:31 +00001331
1332 nextin = 0;
Eric Andersenada18ff2001-05-21 16:18:22 +00001333 pi->pgrp = -1;
Eric Andersen25f27032001-04-26 23:22:31 +00001334
1335 /* Check if this is a simple builtin (not part of a pipe).
1336 * Builtins within pipes have to fork anyway, and are handled in
1337 * pseudo_exec. "echo foo | read bar" doesn't work on bash, either.
1338 */
Eric Andersen04407e52001-06-07 16:42:05 +00001339 if (pi->num_progs == 1) child = & (pi->progs[0]);
1340 if (pi->num_progs == 1 && child->group && child->subshell == 0) {
1341 int squirrel[] = {-1, -1, -1};
1342 int rcode;
1343 debug_printf("non-subshell grouping\n");
1344 setup_redirects(child, squirrel);
1345 /* XXX could we merge code with following builtin case,
1346 * by creating a pseudo builtin that calls run_list_real? */
1347 rcode = run_list_real(child->group);
1348 restore_redirects(squirrel);
1349 return rcode;
1350 } else if (pi->num_progs == 1 && pi->progs[0].argv != NULL) {
Eric Andersen78a7c992001-05-15 16:30:25 +00001351 for (i=0; is_assignment(child->argv[i]); i++) { /* nothing */ }
1352 if (i!=0 && child->argv[i]==NULL) {
1353 /* assignments, but no command: set the local environment */
1354 for (i=0; child->argv[i]!=NULL; i++) {
Eric Andersen99785762001-05-22 21:37:48 +00001355
1356 /* Ok, this case is tricky. We have to decide if this is a
1357 * local variable, or an already exported variable. If it is
1358 * already exported, we have to export the new value. If it is
Eric Andersenc7bda1c2004-03-15 08:29:22 +00001359 * not exported, we need only set this as a local variable.
Eric Andersen99785762001-05-22 21:37:48 +00001360 * This junk is all to decide whether or not to export this
1361 * variable. */
1362 int export_me=0;
1363 char *name, *value;
Manuel Novoa III cad53642003-03-19 09:13:01 +00001364 name = bb_xstrdup(child->argv[i]);
Eric Andersen04407e52001-06-07 16:42:05 +00001365 debug_printf("Local environment set: %s\n", name);
Eric Andersen99785762001-05-22 21:37:48 +00001366 value = strchr(name, '=');
1367 if (value)
1368 *value=0;
1369 if ( get_local_var(name)) {
1370 export_me=1;
1371 }
1372 free(name);
Eric Andersen4c9b68f2002-04-13 12:33:41 +00001373 p = insert_var_value(child->argv[i]);
1374 set_local_var(p, export_me);
1375 if (p != child->argv[i]) free(p);
Eric Andersen78a7c992001-05-15 16:30:25 +00001376 }
1377 return EXIT_SUCCESS; /* don't worry about errors in set_local_var() yet */
1378 }
Eric Andersen4c9b68f2002-04-13 12:33:41 +00001379 for (i = 0; is_assignment(child->argv[i]); i++) {
1380 p = insert_var_value(child->argv[i]);
1381 putenv(strdup(p));
1382 if (p != child->argv[i]) {
1383 child->sp--;
1384 free(p);
1385 }
1386 }
1387 if (child->sp) {
1388 char * str = NULL;
Eric Andersenc7bda1c2004-03-15 08:29:22 +00001389
Eric Andersen4c9b68f2002-04-13 12:33:41 +00001390 str = make_string((child->argv + i));
1391 parse_string_outer(str, FLAG_EXIT_FROM_LOOP | FLAG_REPARSING);
1392 free(str);
1393 return last_return_code;
1394 }
Eric Andersen25f27032001-04-26 23:22:31 +00001395 for (x = bltins; x->cmd; x++) {
Eric Andersen78a7c992001-05-15 16:30:25 +00001396 if (strcmp(child->argv[i], x->cmd) == 0 ) {
Eric Andersen25f27032001-04-26 23:22:31 +00001397 int squirrel[] = {-1, -1, -1};
1398 int rcode;
Eric Andersen78a7c992001-05-15 16:30:25 +00001399 if (x->function == builtin_exec && child->argv[i+1]==NULL) {
Eric Andersen83a2ae22001-05-07 17:59:25 +00001400 debug_printf("magic exec\n");
1401 setup_redirects(child,NULL);
1402 return EXIT_SUCCESS;
1403 }
Eric Andersen25f27032001-04-26 23:22:31 +00001404 debug_printf("builtin inline %s\n", child->argv[0]);
1405 /* XXX setup_redirects acts on file descriptors, not FILEs.
1406 * This is perfect for work that comes after exec().
1407 * Is it really safe for inline use? Experimentally,
1408 * things seem to work with glibc. */
1409 setup_redirects(child, squirrel);
Eric Andersen78a7c992001-05-15 16:30:25 +00001410 child->argv+=i; /* XXX horrible hack */
Eric Andersen25f27032001-04-26 23:22:31 +00001411 rcode = x->function(child);
Eric Andersen78a7c992001-05-15 16:30:25 +00001412 child->argv-=i; /* XXX restore hack so free() can work right */
Eric Andersen25f27032001-04-26 23:22:31 +00001413 restore_redirects(squirrel);
1414 return rcode;
1415 }
1416 }
1417 }
1418
1419 for (i = 0; i < pi->num_progs; i++) {
1420 child = & (pi->progs[i]);
1421
1422 /* pipes are inserted between pairs of commands */
1423 if ((i + 1) < pi->num_progs) {
Manuel Novoa III cad53642003-03-19 09:13:01 +00001424 if (pipe(pipefds)<0) bb_perror_msg_and_die("pipe");
Eric Andersen25f27032001-04-26 23:22:31 +00001425 nextout = pipefds[1];
1426 } else {
1427 nextout=1;
1428 pipefds[0] = -1;
1429 }
1430
1431 /* XXX test for failed fork()? */
Eric Andersene3efc922004-04-12 17:59:24 +00001432#if !defined(__UCLIBC__) || defined(__ARCH_HAS_MMU__)
Eric Andersen72f9a422001-10-28 05:12:20 +00001433 if (!(child->pid = fork()))
1434#else
Eric Andersenc7bda1c2004-03-15 08:29:22 +00001435 if (!(child->pid = vfork()))
Eric Andersen72f9a422001-10-28 05:12:20 +00001436#endif
1437 {
Eric Andersen6c947d22001-06-25 22:24:38 +00001438 /* Set the handling for job control signals back to the default. */
1439 signal(SIGINT, SIG_DFL);
1440 signal(SIGQUIT, SIG_DFL);
Eric Andersen7467c8d2001-07-12 20:26:32 +00001441 signal(SIGTERM, SIG_DFL);
Eric Andersen6c947d22001-06-25 22:24:38 +00001442 signal(SIGTSTP, SIG_DFL);
1443 signal(SIGTTIN, SIG_DFL);
Eric Andersenbafd94f2001-05-02 16:11:59 +00001444 signal(SIGTTOU, SIG_DFL);
Eric Andersen6c947d22001-06-25 22:24:38 +00001445 signal(SIGCHLD, SIG_DFL);
Eric Andersenc7bda1c2004-03-15 08:29:22 +00001446
Eric Andersen25f27032001-04-26 23:22:31 +00001447 close_all();
1448
1449 if (nextin != 0) {
1450 dup2(nextin, 0);
1451 close(nextin);
1452 }
1453 if (nextout != 1) {
1454 dup2(nextout, 1);
1455 close(nextout);
1456 }
1457 if (pipefds[0]!=-1) {
1458 close(pipefds[0]); /* opposite end of our output pipe */
1459 }
1460
1461 /* Like bash, explicit redirects override pipes,
1462 * and the pipe fd is available for dup'ing. */
1463 setup_redirects(child,NULL);
Eric Andersen52a97ca2001-06-22 06:49:26 +00001464
Eric Andersenada18ff2001-05-21 16:18:22 +00001465 if (interactive && pi->followup!=PIPE_BG) {
Eric Andersenbfae2522001-05-17 00:14:27 +00001466 /* If we (the child) win the race, put ourselves in the process
1467 * group whose leader is the first process in this pipe. */
Eric Andersen0fcd4472001-05-02 20:12:03 +00001468 if (pi->pgrp < 0) {
Eric Andersenada18ff2001-05-21 16:18:22 +00001469 pi->pgrp = getpid();
Eric Andersen0fcd4472001-05-02 20:12:03 +00001470 }
Eric Andersen0fcd4472001-05-02 20:12:03 +00001471 if (setpgid(0, pi->pgrp) == 0) {
Eric Andersen52a97ca2001-06-22 06:49:26 +00001472 tcsetpgrp(2, pi->pgrp);
Eric Andersen0fcd4472001-05-02 20:12:03 +00001473 }
1474 }
Eric Andersen25f27032001-04-26 23:22:31 +00001475
1476 pseudo_exec(child);
1477 }
Eric Andersenc7bda1c2004-03-15 08:29:22 +00001478
Eric Andersen52a97ca2001-06-22 06:49:26 +00001479
1480 /* put our child in the process group whose leader is the
1481 first process in this pipe */
Eric Andersen0fcd4472001-05-02 20:12:03 +00001482 if (pi->pgrp < 0) {
1483 pi->pgrp = child->pid;
Eric Andersen25f27032001-04-26 23:22:31 +00001484 }
Eric Andersen0fcd4472001-05-02 20:12:03 +00001485 /* Don't check for errors. The child may be dead already,
1486 * in which case setpgid returns error code EACCES. */
1487 setpgid(child->pid, pi->pgrp);
1488
Eric Andersen25f27032001-04-26 23:22:31 +00001489 if (nextin != 0)
1490 close(nextin);
1491 if (nextout != 1)
1492 close(nextout);
1493
Eric Andersenc7bda1c2004-03-15 08:29:22 +00001494 /* If there isn't another process, nextin is garbage
Eric Andersen25f27032001-04-26 23:22:31 +00001495 but it doesn't matter */
1496 nextin = pipefds[0];
1497 }
1498 return -1;
1499}
1500
1501static int run_list_real(struct pipe *pi)
1502{
Eric Andersen4c9b68f2002-04-13 12:33:41 +00001503 char *save_name = NULL;
1504 char **list = NULL;
1505 char **save_list = NULL;
1506 struct pipe *rpipe;
1507 int flag_rep = 0;
1508 int save_num_progs;
1509 int rcode=0, flag_skip=1;
1510 int flag_restore = 0;
Eric Andersen25f27032001-04-26 23:22:31 +00001511 int if_code=0, next_if_code=0; /* need double-buffer to handle elif */
Eric Andersen4ed5e372001-05-01 01:49:50 +00001512 reserved_style rmode, skip_more_in_this_rmode=RES_XXXX;
Eric Andersen4c9b68f2002-04-13 12:33:41 +00001513 /* check syntax for "for" */
1514 for (rpipe = pi; rpipe; rpipe = rpipe->next) {
1515 if ((rpipe->r_mode == RES_IN ||
1516 rpipe->r_mode == RES_FOR) &&
1517 (rpipe->next == NULL)) {
1518 syntax();
1519 return 1;
Eric Andersenc7bda1c2004-03-15 08:29:22 +00001520 }
1521 if ((rpipe->r_mode == RES_IN &&
1522 (rpipe->next->r_mode == RES_IN &&
Eric Andersen4c9b68f2002-04-13 12:33:41 +00001523 rpipe->next->progs->argv != NULL))||
1524 (rpipe->r_mode == RES_FOR &&
Eric Andersenc7bda1c2004-03-15 08:29:22 +00001525 rpipe->next->r_mode != RES_IN)) {
Eric Andersen4c9b68f2002-04-13 12:33:41 +00001526 syntax();
1527 return 1;
1528 }
1529 }
1530 for (; pi; pi = (flag_restore != 0) ? rpipe : pi->next) {
1531 if (pi->r_mode == RES_WHILE || pi->r_mode == RES_UNTIL ||
1532 pi->r_mode == RES_FOR) {
1533 flag_restore = 0;
1534 if (!rpipe) {
1535 flag_rep = 0;
1536 rpipe = pi;
1537 }
1538 }
Eric Andersen25f27032001-04-26 23:22:31 +00001539 rmode = pi->r_mode;
Eric Andersen4ed5e372001-05-01 01:49:50 +00001540 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);
Eric Andersen4c9b68f2002-04-13 12:33:41 +00001541 if (rmode == skip_more_in_this_rmode && flag_skip) {
1542 if (pi->followup == PIPE_SEQ) flag_skip=0;
1543 continue;
1544 }
1545 flag_skip = 1;
Eric Andersen4ed5e372001-05-01 01:49:50 +00001546 skip_more_in_this_rmode = RES_XXXX;
Eric Andersen25f27032001-04-26 23:22:31 +00001547 if (rmode == RES_THEN || rmode == RES_ELSE) if_code = next_if_code;
1548 if (rmode == RES_THEN && if_code) continue;
1549 if (rmode == RES_ELSE && !if_code) continue;
Eric Andersen99fcd162004-04-12 21:41:29 +00001550 if (rmode == RES_ELIF && !if_code) break;
Eric Andersen4c9b68f2002-04-13 12:33:41 +00001551 if (rmode == RES_FOR && pi->num_progs) {
1552 if (!list) {
Eric Andersenc7bda1c2004-03-15 08:29:22 +00001553 /* if no variable values after "in" we skip "for" */
Eric Andersen4c9b68f2002-04-13 12:33:41 +00001554 if (!pi->next->progs->argv) continue;
1555 /* create list of variable values */
1556 list = make_list_in(pi->next->progs->argv,
1557 pi->progs->argv[0]);
1558 save_list = list;
1559 save_name = pi->progs->argv[0];
1560 pi->progs->argv[0] = NULL;
1561 flag_rep = 1;
Eric Andersenc7bda1c2004-03-15 08:29:22 +00001562 }
Eric Andersen4c9b68f2002-04-13 12:33:41 +00001563 if (!(*list)) {
1564 free(pi->progs->argv[0]);
1565 free(save_list);
1566 list = NULL;
1567 flag_rep = 0;
1568 pi->progs->argv[0] = save_name;
1569 pi->progs->glob_result.gl_pathv[0] =
1570 pi->progs->argv[0];
1571 continue;
Eric Andersenc7bda1c2004-03-15 08:29:22 +00001572 } else {
Eric Andersen4c9b68f2002-04-13 12:33:41 +00001573 /* insert new value from list for variable */
Eric Andersenc7bda1c2004-03-15 08:29:22 +00001574 if (pi->progs->argv[0])
Eric Andersen4c9b68f2002-04-13 12:33:41 +00001575 free(pi->progs->argv[0]);
1576 pi->progs->argv[0] = *list++;
1577 pi->progs->glob_result.gl_pathv[0] =
1578 pi->progs->argv[0];
1579 }
Eric Andersenc7bda1c2004-03-15 08:29:22 +00001580 }
Eric Andersen4c9b68f2002-04-13 12:33:41 +00001581 if (rmode == RES_IN) continue;
1582 if (rmode == RES_DO) {
1583 if (!flag_rep) continue;
Tim Rikerc1ef7bd2006-01-25 00:08:53 +00001584 }
Eric Andersen4c9b68f2002-04-13 12:33:41 +00001585 if ((rmode == RES_DONE)) {
1586 if (flag_rep) {
1587 flag_restore = 1;
1588 } else {
1589 rpipe = NULL;
1590 }
Eric Andersenc7bda1c2004-03-15 08:29:22 +00001591 }
Eric Andersen4ed5e372001-05-01 01:49:50 +00001592 if (pi->num_progs == 0) continue;
Eric Andersen4c9b68f2002-04-13 12:33:41 +00001593 save_num_progs = pi->num_progs; /* save number of programs */
Eric Andersen25f27032001-04-26 23:22:31 +00001594 rcode = run_pipe_real(pi);
Eric Andersen04407e52001-06-07 16:42:05 +00001595 debug_printf("run_pipe_real returned %d\n",rcode);
Eric Andersen25f27032001-04-26 23:22:31 +00001596 if (rcode!=-1) {
1597 /* We only ran a builtin: rcode was set by the return value
1598 * of run_pipe_real(), and we don't need to wait for anything. */
1599 } else if (pi->followup==PIPE_BG) {
1600 /* XXX check bash's behavior with nontrivial pipes */
1601 /* XXX compute jobid */
1602 /* XXX what does bash do with attempts to background builtins? */
Eric Andersenbafd94f2001-05-02 16:11:59 +00001603 insert_bg_job(pi);
Eric Andersen25f27032001-04-26 23:22:31 +00001604 rcode = EXIT_SUCCESS;
1605 } else {
1606 if (interactive) {
1607 /* move the new process group into the foreground */
Eric Andersen6c947d22001-06-25 22:24:38 +00001608 if (tcsetpgrp(shell_terminal, pi->pgrp) && errno != ENOTTY)
Manuel Novoa III cad53642003-03-19 09:13:01 +00001609 bb_perror_msg("tcsetpgrp-3");
Eric Andersenc798b072001-06-22 06:23:03 +00001610 rcode = checkjobs(pi);
Eric Andersen52a97ca2001-06-22 06:49:26 +00001611 /* move the shell to the foreground */
Eric Andersen6c947d22001-06-25 22:24:38 +00001612 if (tcsetpgrp(shell_terminal, getpgid(0)) && errno != ENOTTY)
Manuel Novoa III cad53642003-03-19 09:13:01 +00001613 bb_perror_msg("tcsetpgrp-4");
Eric Andersen25f27032001-04-26 23:22:31 +00001614 } else {
Eric Andersenc798b072001-06-22 06:23:03 +00001615 rcode = checkjobs(pi);
Eric Andersen25f27032001-04-26 23:22:31 +00001616 }
Eric Andersen52a97ca2001-06-22 06:49:26 +00001617 debug_printf("checkjobs returned %d\n",rcode);
Eric Andersen25f27032001-04-26 23:22:31 +00001618 }
1619 last_return_code=rcode;
Eric Andersen4c9b68f2002-04-13 12:33:41 +00001620 pi->num_progs = save_num_progs; /* restore number of programs */
Eric Andersen25f27032001-04-26 23:22:31 +00001621 if ( rmode == RES_IF || rmode == RES_ELIF )
1622 next_if_code=rcode; /* can be overwritten a number of times */
Eric Andersenc7bda1c2004-03-15 08:29:22 +00001623 if (rmode == RES_WHILE)
Eric Andersen4c9b68f2002-04-13 12:33:41 +00001624 flag_rep = !last_return_code;
Eric Andersenc7bda1c2004-03-15 08:29:22 +00001625 if (rmode == RES_UNTIL)
Eric Andersen4c9b68f2002-04-13 12:33:41 +00001626 flag_rep = last_return_code;
Eric Andersen25f27032001-04-26 23:22:31 +00001627 if ( (rcode==EXIT_SUCCESS && pi->followup==PIPE_OR) ||
1628 (rcode!=EXIT_SUCCESS && pi->followup==PIPE_AND) )
Eric Andersen4ed5e372001-05-01 01:49:50 +00001629 skip_more_in_this_rmode=rmode;
Eric Andersen028b65b2001-06-28 01:10:11 +00001630 checkjobs(NULL);
Eric Andersen25f27032001-04-26 23:22:31 +00001631 }
1632 return rcode;
1633}
1634
1635/* broken, of course, but OK for testing */
1636static char *indenter(int i)
1637{
1638 static char blanks[]=" ";
1639 return &blanks[sizeof(blanks)-i-1];
1640}
1641
1642/* return code is the exit status of the pipe */
Eric Andersenbf7df042001-05-23 22:18:35 +00001643static int free_pipe(struct pipe *pi, int indent)
Eric Andersen25f27032001-04-26 23:22:31 +00001644{
1645 char **p;
1646 struct child_prog *child;
1647 struct redir_struct *r, *rnext;
1648 int a, i, ret_code=0;
1649 char *ind = indenter(indent);
Eric Andersen52a97ca2001-06-22 06:49:26 +00001650
1651 if (pi->stopped_progs > 0)
1652 return ret_code;
Eric Andersen25f27032001-04-26 23:22:31 +00001653 final_printf("%s run pipe: (pid %d)\n",ind,getpid());
1654 for (i=0; i<pi->num_progs; i++) {
1655 child = &pi->progs[i];
1656 final_printf("%s command %d:\n",ind,i);
1657 if (child->argv) {
1658 for (a=0,p=child->argv; *p; a++,p++) {
1659 final_printf("%s argv[%d] = %s\n",ind,a,*p);
1660 }
1661 globfree(&child->glob_result);
1662 child->argv=NULL;
1663 } else if (child->group) {
1664 final_printf("%s begin group (subshell:%d)\n",ind, child->subshell);
Eric Andersenbf7df042001-05-23 22:18:35 +00001665 ret_code = free_pipe_list(child->group,indent+3);
Eric Andersen25f27032001-04-26 23:22:31 +00001666 final_printf("%s end group\n",ind);
1667 } else {
1668 final_printf("%s (nil)\n",ind);
1669 }
1670 for (r=child->redirects; r; r=rnext) {
1671 final_printf("%s redirect %d%s", ind, r->fd, redir_table[r->type].descrip);
1672 if (r->dup == -1) {
Eric Andersen817e73c2001-06-06 17:56:09 +00001673 /* guard against the case >$FOO, where foo is unset or blank */
1674 if (r->word.gl_pathv) {
1675 final_printf(" %s\n", *r->word.gl_pathv);
1676 globfree(&r->word);
1677 }
Eric Andersen25f27032001-04-26 23:22:31 +00001678 } else {
1679 final_printf("&%d\n", r->dup);
1680 }
1681 rnext=r->next;
1682 free(r);
1683 }
1684 child->redirects=NULL;
1685 }
1686 free(pi->progs); /* children are an array, they get freed all at once */
1687 pi->progs=NULL;
1688 return ret_code;
1689}
1690
Eric Andersenbf7df042001-05-23 22:18:35 +00001691static int free_pipe_list(struct pipe *head, int indent)
Eric Andersen25f27032001-04-26 23:22:31 +00001692{
1693 int rcode=0; /* if list has no members */
1694 struct pipe *pi, *next;
1695 char *ind = indenter(indent);
1696 for (pi=head; pi; pi=next) {
Eric Andersen25f27032001-04-26 23:22:31 +00001697 final_printf("%s pipe reserved mode %d\n", ind, pi->r_mode);
Eric Andersenbf7df042001-05-23 22:18:35 +00001698 rcode = free_pipe(pi, indent);
Eric Andersen25f27032001-04-26 23:22:31 +00001699 final_printf("%s pipe followup code %d\n", ind, pi->followup);
1700 next=pi->next;
1701 pi->next=NULL;
1702 free(pi);
1703 }
Eric Andersenc7bda1c2004-03-15 08:29:22 +00001704 return rcode;
Eric Andersen25f27032001-04-26 23:22:31 +00001705}
1706
1707/* Select which version we will use */
1708static int run_list(struct pipe *pi)
1709{
1710 int rcode=0;
1711 if (fake_mode==0) {
1712 rcode = run_list_real(pi);
Eric Andersenc7bda1c2004-03-15 08:29:22 +00001713 }
Eric Andersenbf7df042001-05-23 22:18:35 +00001714 /* free_pipe_list has the side effect of clearing memory
Eric Andersen25f27032001-04-26 23:22:31 +00001715 * In the long run that function can be merged with run_list_real,
1716 * but doing that now would hobble the debugging effort. */
Eric Andersenbf7df042001-05-23 22:18:35 +00001717 free_pipe_list(pi,0);
Eric Andersen25f27032001-04-26 23:22:31 +00001718 return rcode;
1719}
1720
1721/* The API for glob is arguably broken. This routine pushes a non-matching
1722 * string into the output structure, removing non-backslashed backslashes.
1723 * If someone can prove me wrong, by performing this function within the
1724 * original glob(3) api, feel free to rewrite this routine into oblivion.
1725 * Return code (0 vs. GLOB_NOSPACE) matches glob(3).
1726 * XXX broken if the last character is '\\', check that before calling.
1727 */
1728static int globhack(const char *src, int flags, glob_t *pglob)
1729{
Eric Andersen817e73c2001-06-06 17:56:09 +00001730 int cnt=0, pathc;
Eric Andersen25f27032001-04-26 23:22:31 +00001731 const char *s;
1732 char *dest;
Eric Andersen817e73c2001-06-06 17:56:09 +00001733 for (cnt=1, s=src; s && *s; s++) {
Eric Andersen25f27032001-04-26 23:22:31 +00001734 if (*s == '\\') s++;
1735 cnt++;
1736 }
1737 dest = malloc(cnt);
1738 if (!dest) return GLOB_NOSPACE;
1739 if (!(flags & GLOB_APPEND)) {
1740 pglob->gl_pathv=NULL;
1741 pglob->gl_pathc=0;
1742 pglob->gl_offs=0;
1743 pglob->gl_offs=0;
1744 }
1745 pathc = ++pglob->gl_pathc;
1746 pglob->gl_pathv = realloc(pglob->gl_pathv, (pathc+1)*sizeof(*pglob->gl_pathv));
1747 if (pglob->gl_pathv == NULL) return GLOB_NOSPACE;
1748 pglob->gl_pathv[pathc-1]=dest;
1749 pglob->gl_pathv[pathc]=NULL;
Eric Andersen817e73c2001-06-06 17:56:09 +00001750 for (s=src; s && *s; s++, dest++) {
Eric Andersen25f27032001-04-26 23:22:31 +00001751 if (*s == '\\') s++;
1752 *dest = *s;
1753 }
1754 *dest='\0';
1755 return 0;
1756}
1757
1758/* XXX broken if the last character is '\\', check that before calling */
1759static int glob_needed(const char *s)
1760{
1761 for (; *s; s++) {
1762 if (*s == '\\') s++;
1763 if (strchr("*[?",*s)) return 1;
1764 }
1765 return 0;
1766}
1767
1768#if 0
1769static void globprint(glob_t *pglob)
1770{
1771 int i;
1772 debug_printf("glob_t at %p:\n", pglob);
1773 debug_printf(" gl_pathc=%d gl_pathv=%p gl_offs=%d gl_flags=%d\n",
1774 pglob->gl_pathc, pglob->gl_pathv, pglob->gl_offs, pglob->gl_flags);
1775 for (i=0; i<pglob->gl_pathc; i++)
1776 debug_printf("pglob->gl_pathv[%d] = %p = %s\n", i,
1777 pglob->gl_pathv[i], pglob->gl_pathv[i]);
1778}
1779#endif
1780
1781static int xglob(o_string *dest, int flags, glob_t *pglob)
1782{
1783 int gr;
1784
Tim Rikerc1ef7bd2006-01-25 00:08:53 +00001785 /* short-circuit for null word */
Eric Andersen25f27032001-04-26 23:22:31 +00001786 /* we can code this better when the debug_printf's are gone */
Tim Rikerc1ef7bd2006-01-25 00:08:53 +00001787 if (dest->length == 0) {
1788 if (dest->nonnull) {
1789 /* bash man page calls this an "explicit" null */
1790 gr = globhack(dest->data, flags, pglob);
1791 debug_printf("globhack returned %d\n",gr);
1792 } else {
Eric Andersen25f27032001-04-26 23:22:31 +00001793 return 0;
1794 }
Tim Rikerc1ef7bd2006-01-25 00:08:53 +00001795 } else if (glob_needed(dest->data)) {
Eric Andersen25f27032001-04-26 23:22:31 +00001796 gr = glob(dest->data, flags, NULL, pglob);
1797 debug_printf("glob returned %d\n",gr);
1798 if (gr == GLOB_NOMATCH) {
1799 /* quote removal, or more accurately, backslash removal */
1800 gr = globhack(dest->data, flags, pglob);
1801 debug_printf("globhack returned %d\n",gr);
1802 }
1803 } else {
1804 gr = globhack(dest->data, flags, pglob);
1805 debug_printf("globhack returned %d\n",gr);
1806 }
Eric Andersen9ffb7dd2001-05-19 03:00:46 +00001807 if (gr == GLOB_NOSPACE)
Manuel Novoa III cad53642003-03-19 09:13:01 +00001808 bb_error_msg_and_die("out of memory during glob");
Eric Andersen25f27032001-04-26 23:22:31 +00001809 if (gr != 0) { /* GLOB_ABORTED ? */
Manuel Novoa III cad53642003-03-19 09:13:01 +00001810 bb_error_msg("glob(3) error %d",gr);
Eric Andersen25f27032001-04-26 23:22:31 +00001811 }
1812 /* globprint(glob_target); */
1813 return gr;
1814}
1815
Eric Andersenf72f5622001-05-15 23:21:41 +00001816/* This is used to get/check local shell variables */
1817static char *get_local_var(const char *s)
1818{
Eric Andersen9ffb7dd2001-05-19 03:00:46 +00001819 struct variables *cur;
Eric Andersenf72f5622001-05-15 23:21:41 +00001820
1821 if (!s)
1822 return NULL;
Eric Andersen9ffb7dd2001-05-19 03:00:46 +00001823 for (cur = top_vars; cur; cur=cur->next)
1824 if(strcmp(cur->name, s)==0)
1825 return cur->value;
Eric Andersenf72f5622001-05-15 23:21:41 +00001826 return NULL;
1827}
1828
Eric Andersen9ffb7dd2001-05-19 03:00:46 +00001829/* This is used to set local shell variables
1830 flg_export==0 if only local (not exporting) variable
1831 flg_export==1 if "new" exporting environ
1832 flg_export>1 if current startup environ (not call putenv()) */
1833static int set_local_var(const char *s, int flg_export)
Eric Andersen78a7c992001-05-15 16:30:25 +00001834{
Eric Andersen9ffb7dd2001-05-19 03:00:46 +00001835 char *name, *value;
Eric Andersen20a69a72001-05-15 17:24:44 +00001836 int result=0;
Eric Andersen9ffb7dd2001-05-19 03:00:46 +00001837 struct variables *cur;
Eric Andersen20a69a72001-05-15 17:24:44 +00001838
Eric Andersen9ffb7dd2001-05-19 03:00:46 +00001839 name=strdup(s);
Eric Andersen20a69a72001-05-15 17:24:44 +00001840
1841 /* Assume when we enter this function that we are already in
1842 * NAME=VALUE format. So the first order of business is to
Eric Andersenc7bda1c2004-03-15 08:29:22 +00001843 * split 's' on the '=' into 'name' and 'value' */
Eric Andersen20a69a72001-05-15 17:24:44 +00001844 value = strchr(name, '=');
Eric Andersen99785762001-05-22 21:37:48 +00001845 if (value==0 && ++value==0) {
1846 free(name);
1847 return -1;
1848 }
1849 *value++ = 0;
Eric Andersen20a69a72001-05-15 17:24:44 +00001850
Eric Andersen99785762001-05-22 21:37:48 +00001851 for(cur = top_vars; cur; cur = cur->next) {
1852 if(strcmp(cur->name, name)==0)
1853 break;
1854 }
Eric Andersen20a69a72001-05-15 17:24:44 +00001855
Eric Andersen99785762001-05-22 21:37:48 +00001856 if(cur) {
1857 if(strcmp(cur->value, value)==0) {
1858 if(flg_export>0 && cur->flg_export==0)
1859 cur->flg_export=flg_export;
1860 else
1861 result++;
Eric Andersen9ffb7dd2001-05-19 03:00:46 +00001862 } else {
Eric Andersen99785762001-05-22 21:37:48 +00001863 if(cur->flg_read_only) {
Manuel Novoa III cad53642003-03-19 09:13:01 +00001864 bb_error_msg("%s: readonly variable", name);
Eric Andersen20a69a72001-05-15 17:24:44 +00001865 result = -1;
Eric Andersen9ffb7dd2001-05-19 03:00:46 +00001866 } else {
Eric Andersen99785762001-05-22 21:37:48 +00001867 if(flg_export>0 || cur->flg_export>1)
1868 cur->flg_export=1;
1869 free(cur->value);
1870
1871 cur->value = strdup(value);
1872 }
1873 }
1874 } else {
1875 cur = malloc(sizeof(struct variables));
1876 if(!cur) {
1877 result = -1;
1878 } else {
1879 cur->name = strdup(name);
1880 if(cur->name == 0) {
1881 free(cur);
1882 result = -1;
1883 } else {
1884 struct variables *bottom = top_vars;
1885 cur->value = strdup(value);
1886 cur->next = 0;
1887 cur->flg_export = flg_export;
1888 cur->flg_read_only = 0;
1889 while(bottom->next) bottom=bottom->next;
1890 bottom->next = cur;
Eric Andersen20a69a72001-05-15 17:24:44 +00001891 }
Eric Andersen20a69a72001-05-15 17:24:44 +00001892 }
Eric Andersen9ffb7dd2001-05-19 03:00:46 +00001893 }
Eric Andersen20a69a72001-05-15 17:24:44 +00001894
Eric Andersen94ac2442001-05-22 19:05:18 +00001895 if(result==0 && cur->flg_export==1) {
Eric Andersen9ffb7dd2001-05-19 03:00:46 +00001896 *(value-1) = '=';
1897 result = putenv(name);
1898 } else {
Eric Andersen94ac2442001-05-22 19:05:18 +00001899 free(name);
Eric Andersen9ffb7dd2001-05-19 03:00:46 +00001900 if(result>0) /* equivalent to previous set */
1901 result = 0;
1902 }
Eric Andersen20a69a72001-05-15 17:24:44 +00001903 return result;
1904}
1905
Eric Andersenf72f5622001-05-15 23:21:41 +00001906static void unset_local_var(const char *name)
Eric Andersen20a69a72001-05-15 17:24:44 +00001907{
Eric Andersen9ffb7dd2001-05-19 03:00:46 +00001908 struct variables *cur;
Eric Andersen20a69a72001-05-15 17:24:44 +00001909
Eric Andersen9ffb7dd2001-05-19 03:00:46 +00001910 if (name) {
Eric Andersen94ac2442001-05-22 19:05:18 +00001911 for (cur = top_vars; cur; cur=cur->next) {
Eric Andersen9ffb7dd2001-05-19 03:00:46 +00001912 if(strcmp(cur->name, name)==0)
1913 break;
Eric Andersen94ac2442001-05-22 19:05:18 +00001914 }
Eric Andersen9ffb7dd2001-05-19 03:00:46 +00001915 if(cur!=0) {
1916 struct variables *next = top_vars;
Eric Andersen94ac2442001-05-22 19:05:18 +00001917 if(cur->flg_read_only) {
Manuel Novoa III cad53642003-03-19 09:13:01 +00001918 bb_error_msg("%s: readonly variable", name);
Eric Andersen94ac2442001-05-22 19:05:18 +00001919 return;
1920 } else {
Eric Andersen9ffb7dd2001-05-19 03:00:46 +00001921 if(cur->flg_export)
1922 unsetenv(cur->name);
1923 free(cur->name);
1924 free(cur->value);
1925 while (next->next != cur)
1926 next = next->next;
1927 next->next = cur->next;
1928 }
1929 free(cur);
Eric Andersenf72f5622001-05-15 23:21:41 +00001930 }
Eric Andersen20a69a72001-05-15 17:24:44 +00001931 }
Eric Andersen78a7c992001-05-15 16:30:25 +00001932}
1933
1934static int is_assignment(const char *s)
1935{
1936 if (s==NULL || !isalpha(*s)) return 0;
1937 ++s;
1938 while(isalnum(*s) || *s=='_') ++s;
1939 return *s=='=';
1940}
1941
Eric Andersen25f27032001-04-26 23:22:31 +00001942/* the src parameter allows us to peek forward to a possible &n syntax
1943 * for file descriptor duplication, e.g., "2>&1".
1944 * Return code is 0 normally, 1 if a syntax error is detected in src.
1945 * Resource errors (in xmalloc) cause the process to exit */
1946static int setup_redirect(struct p_context *ctx, int fd, redir_type style,
1947 struct in_str *input)
1948{
1949 struct child_prog *child=ctx->child;
1950 struct redir_struct *redir = child->redirects;
1951 struct redir_struct *last_redir=NULL;
1952
1953 /* Create a new redir_struct and drop it onto the end of the linked list */
1954 while(redir) {
1955 last_redir=redir;
1956 redir=redir->next;
1957 }
1958 redir = xmalloc(sizeof(struct redir_struct));
1959 redir->next=NULL;
Eric Andersen817e73c2001-06-06 17:56:09 +00001960 redir->word.gl_pathv=NULL;
Eric Andersen25f27032001-04-26 23:22:31 +00001961 if (last_redir) {
1962 last_redir->next=redir;
1963 } else {
1964 child->redirects=redir;
1965 }
1966
1967 redir->type=style;
1968 redir->fd= (fd==-1) ? redir_table[style].default_fd : fd ;
1969
1970 debug_printf("Redirect type %d%s\n", redir->fd, redir_table[style].descrip);
1971
Eric Andersenc7bda1c2004-03-15 08:29:22 +00001972 /* Check for a '2>&1' type redirect */
Eric Andersen25f27032001-04-26 23:22:31 +00001973 redir->dup = redirect_dup_num(input);
1974 if (redir->dup == -2) return 1; /* syntax error */
1975 if (redir->dup != -1) {
1976 /* Erik had a check here that the file descriptor in question
Eric Andersen83a2ae22001-05-07 17:59:25 +00001977 * is legit; I postpone that to "run time"
1978 * A "-" representation of "close me" shows up as a -3 here */
Eric Andersen25f27032001-04-26 23:22:31 +00001979 debug_printf("Duplicating redirect '%d>&%d'\n", redir->fd, redir->dup);
1980 } else {
1981 /* We do _not_ try to open the file that src points to,
1982 * since we need to return and let src be expanded first.
1983 * Set ctx->pending_redirect, so we know what to do at the
1984 * end of the next parsed word.
1985 */
1986 ctx->pending_redirect = redir;
1987 }
1988 return 0;
1989}
1990
"Vladimir N. Oleynik"19c37012005-09-22 14:33:15 +00001991static struct pipe *new_pipe(void) {
Eric Andersen25f27032001-04-26 23:22:31 +00001992 struct pipe *pi;
1993 pi = xmalloc(sizeof(struct pipe));
1994 pi->num_progs = 0;
1995 pi->progs = NULL;
1996 pi->next = NULL;
1997 pi->followup = 0; /* invalid */
Rob Landley032e2cb2005-12-12 06:52:45 +00001998 pi->r_mode = RES_NONE;
Eric Andersen25f27032001-04-26 23:22:31 +00001999 return pi;
2000}
2001
2002static void initialize_context(struct p_context *ctx)
2003{
2004 ctx->pipe=NULL;
2005 ctx->pending_redirect=NULL;
2006 ctx->child=NULL;
2007 ctx->list_head=new_pipe();
2008 ctx->pipe=ctx->list_head;
2009 ctx->w=RES_NONE;
2010 ctx->stack=NULL;
Eric Andersen4c9b68f2002-04-13 12:33:41 +00002011 ctx->old_flag=0;
Eric Andersen25f27032001-04-26 23:22:31 +00002012 done_command(ctx); /* creates the memory for working child */
2013}
2014
2015/* normal return is 0
2016 * if a reserved word is found, and processed, return 1
2017 * should handle if, then, elif, else, fi, for, while, until, do, done.
2018 * case, function, and select are obnoxious, save those for later.
2019 */
"Vladimir N. Oleynik"19c37012005-09-22 14:33:15 +00002020static int reserved_word(o_string *dest, struct p_context *ctx)
Eric Andersen25f27032001-04-26 23:22:31 +00002021{
2022 struct reserved_combo {
2023 char *literal;
2024 int code;
2025 long flag;
2026 };
2027 /* Mostly a list of accepted follow-up reserved words.
2028 * FLAG_END means we are done with the sequence, and are ready
2029 * to turn the compound list into a command.
2030 * FLAG_START means the word must start a new compound list.
2031 */
2032 static struct reserved_combo reserved_list[] = {
2033 { "if", RES_IF, FLAG_THEN | FLAG_START },
2034 { "then", RES_THEN, FLAG_ELIF | FLAG_ELSE | FLAG_FI },
2035 { "elif", RES_ELIF, FLAG_THEN },
2036 { "else", RES_ELSE, FLAG_FI },
2037 { "fi", RES_FI, FLAG_END },
Eric Andersen4c9b68f2002-04-13 12:33:41 +00002038 { "for", RES_FOR, FLAG_IN | FLAG_START },
Eric Andersen25f27032001-04-26 23:22:31 +00002039 { "while", RES_WHILE, FLAG_DO | FLAG_START },
2040 { "until", RES_UNTIL, FLAG_DO | FLAG_START },
Eric Andersen4c9b68f2002-04-13 12:33:41 +00002041 { "in", RES_IN, FLAG_DO },
Eric Andersen25f27032001-04-26 23:22:31 +00002042 { "do", RES_DO, FLAG_DONE },
2043 { "done", RES_DONE, FLAG_END }
2044 };
2045 struct reserved_combo *r;
2046 for (r=reserved_list;
2047#define NRES sizeof(reserved_list)/sizeof(struct reserved_combo)
2048 r<reserved_list+NRES; r++) {
2049 if (strcmp(dest->data, r->literal) == 0) {
2050 debug_printf("found reserved word %s, code %d\n",r->literal,r->code);
2051 if (r->flag & FLAG_START) {
2052 struct p_context *new = xmalloc(sizeof(struct p_context));
2053 debug_printf("push stack\n");
Eric Andersen4c9b68f2002-04-13 12:33:41 +00002054 if (ctx->w == RES_IN || ctx->w == RES_FOR) {
2055 syntax();
2056 free(new);
2057 ctx->w = RES_SNTX;
2058 b_reset(dest);
2059 return 1;
2060 }
Eric Andersen25f27032001-04-26 23:22:31 +00002061 *new = *ctx; /* physical copy */
2062 initialize_context(ctx);
2063 ctx->stack=new;
2064 } else if ( ctx->w == RES_NONE || ! (ctx->old_flag & (1<<r->code))) {
Eric Andersenaf44a0e2001-04-27 07:26:12 +00002065 syntax();
2066 ctx->w = RES_SNTX;
Eric Andersen4c9b68f2002-04-13 12:33:41 +00002067 b_reset(dest);
Eric Andersenaf44a0e2001-04-27 07:26:12 +00002068 return 1;
Eric Andersen25f27032001-04-26 23:22:31 +00002069 }
2070 ctx->w=r->code;
2071 ctx->old_flag = r->flag;
2072 if (ctx->old_flag & FLAG_END) {
2073 struct p_context *old;
2074 debug_printf("pop stack\n");
Eric Andersen4c9b68f2002-04-13 12:33:41 +00002075 done_pipe(ctx,PIPE_SEQ);
Eric Andersen25f27032001-04-26 23:22:31 +00002076 old = ctx->stack;
2077 old->child->group = ctx->list_head;
Eric Andersen04407e52001-06-07 16:42:05 +00002078 old->child->subshell = 0;
Eric Andersen25f27032001-04-26 23:22:31 +00002079 *ctx = *old; /* physical copy */
2080 free(old);
Eric Andersen25f27032001-04-26 23:22:31 +00002081 }
2082 b_reset (dest);
2083 return 1;
2084 }
2085 }
2086 return 0;
2087}
2088
2089/* normal return is 0.
2090 * Syntax or xglob errors return 1. */
2091static int done_word(o_string *dest, struct p_context *ctx)
2092{
2093 struct child_prog *child=ctx->child;
2094 glob_t *glob_target;
2095 int gr, flags = 0;
2096
2097 debug_printf("done_word: %s %p\n", dest->data, child);
2098 if (dest->length == 0 && !dest->nonnull) {
2099 debug_printf(" true null, ignored\n");
2100 return 0;
2101 }
2102 if (ctx->pending_redirect) {
2103 glob_target = &ctx->pending_redirect->word;
2104 } else {
2105 if (child->group) {
2106 syntax();
2107 return 1; /* syntax error, groups and arglists don't mix */
2108 }
Eric Andersen4c9b68f2002-04-13 12:33:41 +00002109 if (!child->argv && (ctx->type & FLAG_PARSE_SEMICOLON)) {
Eric Andersen25f27032001-04-26 23:22:31 +00002110 debug_printf("checking %s for reserved-ness\n",dest->data);
Eric Andersenaf44a0e2001-04-27 07:26:12 +00002111 if (reserved_word(dest,ctx)) return ctx->w==RES_SNTX;
Eric Andersen25f27032001-04-26 23:22:31 +00002112 }
2113 glob_target = &child->glob_result;
Tim Rikerc1ef7bd2006-01-25 00:08:53 +00002114 if (child->argv) flags |= GLOB_APPEND;
Eric Andersen25f27032001-04-26 23:22:31 +00002115 }
2116 gr = xglob(dest, flags, glob_target);
2117 if (gr != 0) return 1;
2118
2119 b_reset(dest);
2120 if (ctx->pending_redirect) {
2121 ctx->pending_redirect=NULL;
2122 if (glob_target->gl_pathc != 1) {
Manuel Novoa III cad53642003-03-19 09:13:01 +00002123 bb_error_msg("ambiguous redirect");
Eric Andersen25f27032001-04-26 23:22:31 +00002124 return 1;
2125 }
2126 } else {
2127 child->argv = glob_target->gl_pathv;
2128 }
Eric Andersen4c9b68f2002-04-13 12:33:41 +00002129 if (ctx->w == RES_FOR) {
2130 done_word(dest,ctx);
2131 done_pipe(ctx,PIPE_SEQ);
2132 }
Eric Andersen25f27032001-04-26 23:22:31 +00002133 return 0;
2134}
2135
2136/* The only possible error here is out of memory, in which case
2137 * xmalloc exits. */
2138static int done_command(struct p_context *ctx)
2139{
2140 /* The child is really already in the pipe structure, so
2141 * advance the pipe counter and make a new, null child.
2142 * Only real trickiness here is that the uncommitted
2143 * child structure, to which ctx->child points, is not
2144 * counted in pi->num_progs. */
2145 struct pipe *pi=ctx->pipe;
2146 struct child_prog *prog=ctx->child;
2147
2148 if (prog && prog->group == NULL
2149 && prog->argv == NULL
2150 && prog->redirects == NULL) {
2151 debug_printf("done_command: skipping null command\n");
2152 return 0;
2153 } else if (prog) {
2154 pi->num_progs++;
2155 debug_printf("done_command: num_progs incremented to %d\n",pi->num_progs);
2156 } else {
2157 debug_printf("done_command: initializing\n");
2158 }
2159 pi->progs = xrealloc(pi->progs, sizeof(*pi->progs) * (pi->num_progs+1));
2160
2161 prog = pi->progs + pi->num_progs;
2162 prog->redirects = NULL;
2163 prog->argv = NULL;
2164 prog->is_stopped = 0;
2165 prog->group = NULL;
2166 prog->glob_result.gl_pathv = NULL;
2167 prog->family = pi;
Eric Andersen4c9b68f2002-04-13 12:33:41 +00002168 prog->sp = 0;
2169 ctx->child = prog;
2170 prog->type = ctx->type;
Eric Andersen25f27032001-04-26 23:22:31 +00002171
Eric Andersen25f27032001-04-26 23:22:31 +00002172 /* but ctx->pipe and ctx->list_head remain unchanged */
2173 return 0;
2174}
2175
2176static int done_pipe(struct p_context *ctx, pipe_style type)
2177{
2178 struct pipe *new_p;
2179 done_command(ctx); /* implicit closure of previous command */
2180 debug_printf("done_pipe, type %d\n", type);
2181 ctx->pipe->followup = type;
2182 ctx->pipe->r_mode = ctx->w;
2183 new_p=new_pipe();
2184 ctx->pipe->next = new_p;
2185 ctx->pipe = new_p;
2186 ctx->child = NULL;
2187 done_command(ctx); /* set up new pipe to accept commands */
2188 return 0;
2189}
2190
2191/* peek ahead in the in_str to find out if we have a "&n" construct,
2192 * as in "2>&1", that represents duplicating a file descriptor.
2193 * returns either -2 (syntax error), -1 (no &), or the number found.
2194 */
2195static int redirect_dup_num(struct in_str *input)
2196{
2197 int ch, d=0, ok=0;
2198 ch = b_peek(input);
2199 if (ch != '&') return -1;
2200
2201 b_getch(input); /* get the & */
Eric Andersen83a2ae22001-05-07 17:59:25 +00002202 ch=b_peek(input);
2203 if (ch == '-') {
2204 b_getch(input);
2205 return -3; /* "-" represents "close me" */
2206 }
2207 while (isdigit(ch)) {
Eric Andersen25f27032001-04-26 23:22:31 +00002208 d = d*10+(ch-'0');
2209 ok=1;
2210 b_getch(input);
Eric Andersen83a2ae22001-05-07 17:59:25 +00002211 ch = b_peek(input);
Eric Andersen25f27032001-04-26 23:22:31 +00002212 }
2213 if (ok) return d;
2214
Manuel Novoa III cad53642003-03-19 09:13:01 +00002215 bb_error_msg("ambiguous redirect");
Eric Andersen25f27032001-04-26 23:22:31 +00002216 return -2;
2217}
2218
2219/* If a redirect is immediately preceded by a number, that number is
2220 * supposed to tell which file descriptor to redirect. This routine
2221 * looks for such preceding numbers. In an ideal world this routine
2222 * needs to handle all the following classes of redirects...
2223 * echo 2>foo # redirects fd 2 to file "foo", nothing passed to echo
2224 * echo 49>foo # redirects fd 49 to file "foo", nothing passed to echo
2225 * echo -2>foo # redirects fd 1 to file "foo", "-2" passed to echo
2226 * echo 49x>foo # redirects fd 1 to file "foo", "49x" passed to echo
2227 * A -1 output from this program means no valid number was found, so the
2228 * caller should use the appropriate default for this redirection.
2229 */
2230static int redirect_opt_num(o_string *o)
2231{
2232 int num;
2233
2234 if (o->length==0) return -1;
2235 for(num=0; num<o->length; num++) {
2236 if (!isdigit(*(o->data+num))) {
2237 return -1;
2238 }
2239 }
2240 /* reuse num (and save an int) */
2241 num=atoi(o->data);
2242 b_reset(o);
2243 return num;
2244}
2245
"Vladimir N. Oleynik"19c37012005-09-22 14:33:15 +00002246static FILE *generate_stream_from_list(struct pipe *head)
Eric Andersen25f27032001-04-26 23:22:31 +00002247{
2248 FILE *pf;
2249#if 1
2250 int pid, channel[2];
Manuel Novoa III cad53642003-03-19 09:13:01 +00002251 if (pipe(channel)<0) bb_perror_msg_and_die("pipe");
Eric Andersene3efc922004-04-12 17:59:24 +00002252#if !defined(__UCLIBC__) || defined(__ARCH_HAS_MMU__)
Eric Andersen25f27032001-04-26 23:22:31 +00002253 pid=fork();
Eric Andersen72f9a422001-10-28 05:12:20 +00002254#else
2255 pid=vfork();
2256#endif
Eric Andersen25f27032001-04-26 23:22:31 +00002257 if (pid<0) {
Manuel Novoa III cad53642003-03-19 09:13:01 +00002258 bb_perror_msg_and_die("fork");
Eric Andersen25f27032001-04-26 23:22:31 +00002259 } else if (pid==0) {
2260 close(channel[0]);
2261 if (channel[1] != 1) {
2262 dup2(channel[1],1);
2263 close(channel[1]);
2264 }
2265#if 0
2266#define SURROGATE "surrogate response"
2267 write(1,SURROGATE,sizeof(SURROGATE));
Eric Andersen94ac2442001-05-22 19:05:18 +00002268 _exit(run_list(head));
Eric Andersen25f27032001-04-26 23:22:31 +00002269#else
Eric Andersen94ac2442001-05-22 19:05:18 +00002270 _exit(run_list_real(head)); /* leaks memory */
Eric Andersen25f27032001-04-26 23:22:31 +00002271#endif
2272 }
2273 debug_printf("forked child %d\n",pid);
2274 close(channel[1]);
2275 pf = fdopen(channel[0],"r");
2276 debug_printf("pipe on FILE *%p\n",pf);
2277#else
Eric Andersenbf7df042001-05-23 22:18:35 +00002278 free_pipe_list(head,0);
Eric Andersen25f27032001-04-26 23:22:31 +00002279 pf=popen("echo surrogate response","r");
2280 debug_printf("started fake pipe on FILE *%p\n",pf);
2281#endif
2282 return pf;
2283}
2284
2285/* this version hacked for testing purposes */
2286/* return code is exit status of the process that is run. */
2287static int process_command_subs(o_string *dest, struct p_context *ctx, struct in_str *input, int subst_end)
2288{
2289 int retcode;
2290 o_string result=NULL_O_STRING;
2291 struct p_context inner;
2292 FILE *p;
2293 struct in_str pipe_str;
2294 initialize_context(&inner);
2295
2296 /* recursion to generate command */
2297 retcode = parse_stream(&result, &inner, input, subst_end);
2298 if (retcode != 0) return retcode; /* syntax error or EOF */
2299 done_word(&result, &inner);
2300 done_pipe(&inner, PIPE_SEQ);
2301 b_free(&result);
2302
2303 p=generate_stream_from_list(inner.list_head);
2304 if (p==NULL) return 1;
2305 mark_open(fileno(p));
2306 setup_file_in_str(&pipe_str, p);
2307
2308 /* now send results of command back into original context */
2309 retcode = parse_stream(dest, ctx, &pipe_str, '\0');
2310 /* XXX In case of a syntax error, should we try to kill the child?
2311 * That would be tough to do right, so just read until EOF. */
2312 if (retcode == 1) {
2313 while (b_getch(&pipe_str)!=EOF) { /* discard */ };
2314 }
2315
2316 debug_printf("done reading from pipe, pclose()ing\n");
2317 /* This is the step that wait()s for the child. Should be pretty
2318 * safe, since we just read an EOF from its stdout. We could try
2319 * to better, by using wait(), and keeping track of background jobs
2320 * at the same time. That would be a lot of work, and contrary
2321 * to the KISS philosophy of this program. */
2322 mark_closed(fileno(p));
2323 retcode=pclose(p);
Eric Andersena15dc152001-05-23 23:46:09 +00002324 free_pipe_list(inner.list_head,0);
Eric Andersen25f27032001-04-26 23:22:31 +00002325 debug_printf("pclosed, retcode=%d\n",retcode);
2326 /* XXX this process fails to trim a single trailing newline */
2327 return retcode;
2328}
2329
2330static int parse_group(o_string *dest, struct p_context *ctx,
2331 struct in_str *input, int ch)
2332{
2333 int rcode, endch=0;
2334 struct p_context sub;
2335 struct child_prog *child = ctx->child;
2336 if (child->argv) {
2337 syntax();
2338 return 1; /* syntax error, groups and arglists don't mix */
2339 }
2340 initialize_context(&sub);
2341 switch(ch) {
2342 case '(': endch=')'; child->subshell=1; break;
2343 case '{': endch='}'; break;
2344 default: syntax(); /* really logic error */
2345 }
2346 rcode=parse_stream(dest,&sub,input,endch);
2347 done_word(dest,&sub); /* finish off the final word in the subcontext */
2348 done_pipe(&sub, PIPE_SEQ); /* and the final command there, too */
2349 child->group = sub.list_head;
2350 return rcode;
2351 /* child remains "open", available for possible redirects */
2352}
2353
2354/* basically useful version until someone wants to get fancier,
2355 * see the bash man page under "Parameter Expansion" */
Eric Andersen4c9b68f2002-04-13 12:33:41 +00002356static char *lookup_param(char *src)
Eric Andersen25f27032001-04-26 23:22:31 +00002357{
Eric Andersen4c9b68f2002-04-13 12:33:41 +00002358 char *p=NULL;
Eric Andersenc7bda1c2004-03-15 08:29:22 +00002359 if (src) {
Eric Andersen4c9b68f2002-04-13 12:33:41 +00002360 p = getenv(src);
Eric Andersenc7bda1c2004-03-15 08:29:22 +00002361 if (!p)
Eric Andersen4c9b68f2002-04-13 12:33:41 +00002362 p = get_local_var(src);
Eric Andersen20a69a72001-05-15 17:24:44 +00002363 }
Eric Andersen4c9b68f2002-04-13 12:33:41 +00002364 return p;
Eric Andersen25f27032001-04-26 23:22:31 +00002365}
2366
2367/* return code: 0 for OK, 1 for syntax error */
2368static int handle_dollar(o_string *dest, struct p_context *ctx, struct in_str *input)
2369{
2370 int i, advance=0;
Eric Andersen25f27032001-04-26 23:22:31 +00002371 char sep[]=" ";
2372 int ch = input->peek(input); /* first character after the $ */
2373 debug_printf("handle_dollar: ch=%c\n",ch);
2374 if (isalpha(ch)) {
Eric Andersen4c9b68f2002-04-13 12:33:41 +00002375 b_addchr(dest, SPECIAL_VAR_SYMBOL);
2376 ctx->child->sp++;
Eric Andersen25f27032001-04-26 23:22:31 +00002377 while(ch=b_peek(input),isalnum(ch) || ch=='_') {
2378 b_getch(input);
Eric Andersen4c9b68f2002-04-13 12:33:41 +00002379 b_addchr(dest,ch);
Eric Andersen25f27032001-04-26 23:22:31 +00002380 }
Eric Andersen4c9b68f2002-04-13 12:33:41 +00002381 b_addchr(dest, SPECIAL_VAR_SYMBOL);
Eric Andersen25f27032001-04-26 23:22:31 +00002382 } else if (isdigit(ch)) {
2383 i = ch-'0'; /* XXX is $0 special? */
2384 if (i<global_argc) {
2385 parse_string(dest, ctx, global_argv[i]); /* recursion */
2386 }
2387 advance = 1;
2388 } else switch (ch) {
2389 case '$':
2390 b_adduint(dest,getpid());
2391 advance = 1;
2392 break;
2393 case '!':
2394 if (last_bg_pid > 0) b_adduint(dest, last_bg_pid);
2395 advance = 1;
2396 break;
2397 case '?':
2398 b_adduint(dest,last_return_code);
2399 advance = 1;
2400 break;
2401 case '#':
2402 b_adduint(dest,global_argc ? global_argc-1 : 0);
2403 advance = 1;
2404 break;
2405 case '{':
Eric Andersen4c9b68f2002-04-13 12:33:41 +00002406 b_addchr(dest, SPECIAL_VAR_SYMBOL);
2407 ctx->child->sp++;
Eric Andersen25f27032001-04-26 23:22:31 +00002408 b_getch(input);
2409 /* XXX maybe someone will try to escape the '}' */
2410 while(ch=b_getch(input),ch!=EOF && ch!='}') {
Eric Andersen4c9b68f2002-04-13 12:33:41 +00002411 b_addchr(dest,ch);
Eric Andersen25f27032001-04-26 23:22:31 +00002412 }
2413 if (ch != '}') {
2414 syntax();
2415 return 1;
2416 }
Eric Andersen4c9b68f2002-04-13 12:33:41 +00002417 b_addchr(dest, SPECIAL_VAR_SYMBOL);
Eric Andersen25f27032001-04-26 23:22:31 +00002418 break;
2419 case '(':
Matt Kraai9f8caf12001-05-02 16:26:12 +00002420 b_getch(input);
Eric Andersen25f27032001-04-26 23:22:31 +00002421 process_command_subs(dest, ctx, input, ')');
2422 break;
2423 case '*':
2424 sep[0]=ifs[0];
2425 for (i=1; i<global_argc; i++) {
2426 parse_string(dest, ctx, global_argv[i]);
2427 if (i+1 < global_argc) parse_string(dest, ctx, sep);
2428 }
2429 break;
2430 case '@':
2431 case '-':
2432 case '_':
2433 /* still unhandled, but should be eventually */
Manuel Novoa III cad53642003-03-19 09:13:01 +00002434 bb_error_msg("unhandled syntax: $%c",ch);
Eric Andersen25f27032001-04-26 23:22:31 +00002435 return 1;
2436 break;
2437 default:
2438 b_addqchr(dest,'$',dest->quote);
2439 }
2440 /* Eat the character if the flag was set. If the compiler
2441 * is smart enough, we could substitute "b_getch(input);"
2442 * for all the "advance = 1;" above, and also end up with
2443 * a nice size-optimized program. Hah! That'll be the day.
2444 */
2445 if (advance) b_getch(input);
2446 return 0;
2447}
2448
2449int parse_string(o_string *dest, struct p_context *ctx, const char *src)
2450{
2451 struct in_str foo;
2452 setup_string_in_str(&foo, src);
2453 return parse_stream(dest, ctx, &foo, '\0');
2454}
2455
2456/* return code is 0 for normal exit, 1 for syntax error */
2457int parse_stream(o_string *dest, struct p_context *ctx,
2458 struct in_str *input, int end_trigger)
2459{
"Vladimir N. Oleynik"4ccd2b42006-01-31 09:27:48 +00002460 int ch, m;
Eric Andersen25f27032001-04-26 23:22:31 +00002461 int redir_fd;
2462 redir_type redir_style;
2463 int next;
2464
2465 /* Only double-quote state is handled in the state variable dest->quote.
2466 * A single-quote triggers a bypass of the main loop until its mate is
2467 * found. When recursing, quote state is passed in via dest->quote. */
2468
2469 debug_printf("parse_stream, end_trigger=%d\n",end_trigger);
2470 while ((ch=b_getch(input))!=EOF) {
2471 m = map[ch];
2472 next = (ch == '\n') ? 0 : b_peek(input);
2473 debug_printf("parse_stream: ch=%c (%d) m=%d quote=%d\n",
2474 ch,ch,m,dest->quote);
2475 if (m==0 || ((m==1 || m==2) && dest->quote)) {
2476 b_addqchr(dest, ch, dest->quote);
Eric Andersenaac75e52001-04-30 18:18:45 +00002477 } else {
2478 if (m==2) { /* unquoted IFS */
Eric Andersen4c9b68f2002-04-13 12:33:41 +00002479 if (done_word(dest, ctx)) {
2480 return 1;
Eric Andersenc7bda1c2004-03-15 08:29:22 +00002481 }
Matt Kraai20a30692001-05-02 17:52:49 +00002482 /* If we aren't performing a substitution, treat a newline as a
2483 * command separator. */
2484 if (end_trigger != '\0' && ch=='\n')
2485 done_pipe(ctx,PIPE_SEQ);
Eric Andersenaac75e52001-04-30 18:18:45 +00002486 }
Eric Andersenaf44a0e2001-04-27 07:26:12 +00002487 if (ch == end_trigger && !dest->quote && ctx->w==RES_NONE) {
Matt Kraaibdd4ece2001-05-23 17:43:00 +00002488 debug_printf("leaving parse_stream (triggered)\n");
Eric Andersenaf44a0e2001-04-27 07:26:12 +00002489 return 0;
2490 }
Eric Andersen25f27032001-04-26 23:22:31 +00002491#if 0
2492 if (ch=='\n') {
2493 /* Yahoo! Time to run with it! */
2494 done_pipe(ctx,PIPE_SEQ);
2495 run_list(ctx->list_head);
2496 initialize_context(ctx);
2497 }
2498#endif
Eric Andersenaac75e52001-04-30 18:18:45 +00002499 if (m!=2) switch (ch) {
Eric Andersen25f27032001-04-26 23:22:31 +00002500 case '#':
2501 if (dest->length == 0 && !dest->quote) {
2502 while(ch=b_peek(input),ch!=EOF && ch!='\n') { b_getch(input); }
2503 } else {
2504 b_addqchr(dest, ch, dest->quote);
2505 }
2506 break;
2507 case '\\':
2508 if (next == EOF) {
2509 syntax();
2510 return 1;
2511 }
2512 b_addqchr(dest, '\\', dest->quote);
2513 b_addqchr(dest, b_getch(input), dest->quote);
2514 break;
2515 case '$':
2516 if (handle_dollar(dest, ctx, input)!=0) return 1;
2517 break;
2518 case '\'':
2519 dest->nonnull = 1;
2520 while(ch=b_getch(input),ch!=EOF && ch!='\'') {
2521 b_addchr(dest,ch);
2522 }
2523 if (ch==EOF) {
2524 syntax();
2525 return 1;
2526 }
2527 break;
2528 case '"':
2529 dest->nonnull = 1;
2530 dest->quote = !dest->quote;
2531 break;
2532 case '`':
2533 process_command_subs(dest, ctx, input, '`');
2534 break;
2535 case '>':
2536 redir_fd = redirect_opt_num(dest);
2537 done_word(dest, ctx);
2538 redir_style=REDIRECT_OVERWRITE;
2539 if (next == '>') {
2540 redir_style=REDIRECT_APPEND;
2541 b_getch(input);
2542 } else if (next == '(') {
2543 syntax(); /* until we support >(list) Process Substitution */
2544 return 1;
2545 }
2546 setup_redirect(ctx, redir_fd, redir_style, input);
2547 break;
2548 case '<':
2549 redir_fd = redirect_opt_num(dest);
2550 done_word(dest, ctx);
2551 redir_style=REDIRECT_INPUT;
2552 if (next == '<') {
2553 redir_style=REDIRECT_HEREIS;
2554 b_getch(input);
2555 } else if (next == '>') {
2556 redir_style=REDIRECT_IO;
2557 b_getch(input);
2558 } else if (next == '(') {
2559 syntax(); /* until we support <(list) Process Substitution */
2560 return 1;
2561 }
2562 setup_redirect(ctx, redir_fd, redir_style, input);
2563 break;
2564 case ';':
2565 done_word(dest, ctx);
2566 done_pipe(ctx,PIPE_SEQ);
2567 break;
2568 case '&':
2569 done_word(dest, ctx);
2570 if (next=='&') {
2571 b_getch(input);
2572 done_pipe(ctx,PIPE_AND);
2573 } else {
2574 done_pipe(ctx,PIPE_BG);
2575 }
2576 break;
2577 case '|':
2578 done_word(dest, ctx);
2579 if (next=='|') {
2580 b_getch(input);
2581 done_pipe(ctx,PIPE_OR);
2582 } else {
2583 /* we could pick up a file descriptor choice here
2584 * with redirect_opt_num(), but bash doesn't do it.
2585 * "echo foo 2| cat" yields "foo 2". */
2586 done_command(ctx);
2587 }
2588 break;
2589 case '(':
2590 case '{':
2591 if (parse_group(dest, ctx, input, ch)!=0) return 1;
2592 break;
2593 case ')':
2594 case '}':
2595 syntax(); /* Proper use of this character caught by end_trigger */
2596 return 1;
2597 break;
2598 default:
2599 syntax(); /* this is really an internal logic error */
2600 return 1;
Eric Andersenaac75e52001-04-30 18:18:45 +00002601 }
Eric Andersen25f27032001-04-26 23:22:31 +00002602 }
2603 }
2604 /* complain if quote? No, maybe we just finished a command substitution
2605 * that was quoted. Example:
Eric Andersenc7bda1c2004-03-15 08:29:22 +00002606 * $ echo "`cat foo` plus more"
Eric Andersen25f27032001-04-26 23:22:31 +00002607 * and we just got the EOF generated by the subshell that ran "cat foo"
2608 * The only real complaint is if we got an EOF when end_trigger != '\0',
2609 * that is, we were really supposed to get end_trigger, and never got
2610 * one before the EOF. Can't use the standard "syntax error" return code,
2611 * so that parse_stream_outer can distinguish the EOF and exit smoothly. */
Matt Kraaibdd4ece2001-05-23 17:43:00 +00002612 debug_printf("leaving parse_stream (EOF)\n");
Eric Andersen25f27032001-04-26 23:22:31 +00002613 if (end_trigger != '\0') return -1;
2614 return 0;
2615}
2616
Eric Andersena68ea1c2006-01-30 22:48:39 +00002617static void mapset(const char *set, int code)
Eric Andersen25f27032001-04-26 23:22:31 +00002618{
"Vladimir N. Oleynik"4ccd2b42006-01-31 09:27:48 +00002619 const unsigned char *s;
2620 for (s = (const unsigned char *)set; *s; s++) map[(int)*s] = code;
Eric Andersen25f27032001-04-26 23:22:31 +00002621}
2622
"Vladimir N. Oleynik"19c37012005-09-22 14:33:15 +00002623static void update_ifs_map(void)
Eric Andersen25f27032001-04-26 23:22:31 +00002624{
2625 /* char *ifs and char map[256] are both globals. */
2626 ifs = getenv("IFS");
2627 if (ifs == NULL) ifs=" \t\n";
2628 /* Precompute a list of 'flow through' behavior so it can be treated
2629 * quickly up front. Computation is necessary because of IFS.
2630 * Special case handling of IFS == " \t\n" is not implemented.
2631 * The map[] array only really needs two bits each, and on most machines
2632 * that would be faster because of the reduced L1 cache footprint.
2633 */
Eric Andersenaeb44c42001-05-22 20:29:00 +00002634 memset(map,0,sizeof(map)); /* most characters flow through always */
2635 mapset("\\$'\"`", 3); /* never flow through */
2636 mapset("<>;&|(){}#", 1); /* flow through if quoted */
2637 mapset(ifs, 2); /* also flow through if quoted */
Eric Andersen25f27032001-04-26 23:22:31 +00002638}
2639
Eric Andersenaff114c2004-04-14 17:51:38 +00002640/* most recursion does not come through here, the exception is
Eric Andersen25f27032001-04-26 23:22:31 +00002641 * from builtin_source() */
Eric Andersen4c9b68f2002-04-13 12:33:41 +00002642int parse_stream_outer(struct in_str *inp, int flag)
Eric Andersen25f27032001-04-26 23:22:31 +00002643{
2644
2645 struct p_context ctx;
2646 o_string temp=NULL_O_STRING;
2647 int rcode;
2648 do {
Eric Andersen4c9b68f2002-04-13 12:33:41 +00002649 ctx.type = flag;
Eric Andersen25f27032001-04-26 23:22:31 +00002650 initialize_context(&ctx);
2651 update_ifs_map();
Eric Andersen4c9b68f2002-04-13 12:33:41 +00002652 if (!(flag & FLAG_PARSE_SEMICOLON) || (flag & FLAG_REPARSING)) mapset(";$&|", 0);
Eric Andersen25f27032001-04-26 23:22:31 +00002653 inp->promptmode=1;
2654 rcode = parse_stream(&temp, &ctx, inp, '\n');
Eric Andersen4c9b68f2002-04-13 12:33:41 +00002655 if (rcode != 1 && ctx.old_flag != 0) {
2656 syntax();
2657 }
2658 if (rcode != 1 && ctx.old_flag == 0) {
2659 done_word(&temp, &ctx);
2660 done_pipe(&ctx,PIPE_SEQ);
2661 run_list(ctx.list_head);
2662 } else {
2663 if (ctx.old_flag != 0) {
2664 free(ctx.stack);
2665 b_reset(&temp);
Eric Andersenc7bda1c2004-03-15 08:29:22 +00002666 }
Eric Andersen4c9b68f2002-04-13 12:33:41 +00002667 temp.nonnull = 0;
2668 temp.quote = 0;
2669 inp->p = NULL;
2670 free_pipe_list(ctx.list_head,0);
2671 }
Eric Andersena813afc2001-05-24 16:19:36 +00002672 b_free(&temp);
Eric Andersen4c9b68f2002-04-13 12:33:41 +00002673 } while (rcode != -1 && !(flag & FLAG_EXIT_FROM_LOOP)); /* loop on syntax errors, return on EOF */
Eric Andersen25f27032001-04-26 23:22:31 +00002674 return 0;
2675}
2676
Eric Andersen4c9b68f2002-04-13 12:33:41 +00002677static int parse_string_outer(const char *s, int flag)
Eric Andersen25f27032001-04-26 23:22:31 +00002678{
2679 struct in_str input;
2680 setup_string_in_str(&input, s);
Eric Andersen4c9b68f2002-04-13 12:33:41 +00002681 return parse_stream_outer(&input, flag);
Eric Andersen25f27032001-04-26 23:22:31 +00002682}
2683
2684static int parse_file_outer(FILE *f)
2685{
2686 int rcode;
2687 struct in_str input;
2688 setup_file_in_str(&input, f);
Eric Andersen4c9b68f2002-04-13 12:33:41 +00002689 rcode = parse_stream_outer(&input, FLAG_PARSE_SEMICOLON);
Eric Andersen25f27032001-04-26 23:22:31 +00002690 return rcode;
2691}
2692
Eric Andersen6c947d22001-06-25 22:24:38 +00002693/* Make sure we have a controlling tty. If we get started under a job
2694 * aware app (like bash for example), make sure we are now in charge so
2695 * we don't fight over who gets the foreground */
Eric Anderseneaecbf32001-10-31 10:41:31 +00002696static void setup_job_control(void)
Eric Andersen52a97ca2001-06-22 06:49:26 +00002697{
Eric Andersen6c947d22001-06-25 22:24:38 +00002698 static pid_t shell_pgrp;
2699 /* Loop until we are in the foreground. */
2700 while (tcgetpgrp (shell_terminal) != (shell_pgrp = getpgrp ()))
2701 kill (- shell_pgrp, SIGTTIN);
Eric Andersen52a97ca2001-06-22 06:49:26 +00002702
Eric Andersen6c947d22001-06-25 22:24:38 +00002703 /* Ignore interactive and job-control signals. */
2704 signal(SIGINT, SIG_IGN);
2705 signal(SIGQUIT, SIG_IGN);
Eric Andersen7467c8d2001-07-12 20:26:32 +00002706 signal(SIGTERM, SIG_IGN);
Eric Andersen6c947d22001-06-25 22:24:38 +00002707 signal(SIGTSTP, SIG_IGN);
2708 signal(SIGTTIN, SIG_IGN);
2709 signal(SIGTTOU, SIG_IGN);
Eric Andersen028b65b2001-06-28 01:10:11 +00002710 signal(SIGCHLD, SIG_IGN);
Eric Andersen6c947d22001-06-25 22:24:38 +00002711
2712 /* Put ourselves in our own process group. */
Eric Andersen5c66d062001-06-26 23:16:31 +00002713 setsid();
Eric Andersen6c947d22001-06-25 22:24:38 +00002714 shell_pgrp = getpid ();
Eric Andersena90f20b2001-06-26 23:00:21 +00002715 setpgid (shell_pgrp, shell_pgrp);
Eric Andersen6c947d22001-06-25 22:24:38 +00002716
2717 /* Grab control of the terminal. */
2718 tcsetpgrp(shell_terminal, shell_pgrp);
2719}
Eric Andersenada18ff2001-05-21 16:18:22 +00002720
Matt Kraai2d91deb2001-08-01 17:21:35 +00002721int hush_main(int argc, char **argv)
Eric Andersen25f27032001-04-26 23:22:31 +00002722{
2723 int opt;
2724 FILE *input;
Eric Andersen9ffb7dd2001-05-19 03:00:46 +00002725 char **e = environ;
Eric Andersenbc604a22001-05-16 05:24:03 +00002726
Eric Andersen25f27032001-04-26 23:22:31 +00002727 /* XXX what should these be while sourcing /etc/profile? */
2728 global_argc = argc;
2729 global_argv = argv;
Eric Andersenc7bda1c2004-03-15 08:29:22 +00002730
Matt Kraai2d91deb2001-08-01 17:21:35 +00002731 /* (re?) initialize globals. Sometimes hush_main() ends up calling
Eric Andersenc7bda1c2004-03-15 08:29:22 +00002732 * hush_main(), therefore we cannot rely on the BSS to zero out this
Eric Andersen94ac2442001-05-22 19:05:18 +00002733 * stuff. Reset these to 0 every time. */
2734 ifs = NULL;
Eric Andersenaeb44c42001-05-22 20:29:00 +00002735 /* map[] is taken care of with call to update_ifs_map() */
Eric Andersen94ac2442001-05-22 19:05:18 +00002736 fake_mode = 0;
2737 interactive = 0;
2738 close_me_head = NULL;
2739 last_bg_pid = 0;
Eric Andersen52a97ca2001-06-22 06:49:26 +00002740 job_list = NULL;
Eric Andersenc798b072001-06-22 06:23:03 +00002741 last_jobid = 0;
Eric Andersen94ac2442001-05-22 19:05:18 +00002742
2743 /* Initialize some more globals to non-zero values */
2744 set_cwd();
Eric Andersenbdfd0d72001-10-24 05:00:29 +00002745#ifdef CONFIG_FEATURE_COMMAND_EDITING
Eric Andersen94ac2442001-05-22 19:05:18 +00002746 cmdedit_set_initial_prompt();
2747#else
2748 PS1 = NULL;
2749#endif
2750 PS2 = "> ";
2751
Eric Andersenc7bda1c2004-03-15 08:29:22 +00002752 /* initialize our shell local variables with the values
Eric Andersen94ac2442001-05-22 19:05:18 +00002753 * currently living in the environment */
2754 if (e) {
2755 for (; *e; e++)
2756 set_local_var(*e, 2); /* without call putenv() */
2757 }
2758
2759 last_return_code=EXIT_SUCCESS;
2760
Eric Andersen25f27032001-04-26 23:22:31 +00002761
2762 if (argv[0] && argv[0][0] == '-') {
2763 debug_printf("\nsourcing /etc/profile\n");
Eric Andersena90f20b2001-06-26 23:00:21 +00002764 if ((input = fopen("/etc/profile", "r")) != NULL) {
2765 mark_open(fileno(input));
2766 parse_file_outer(input);
2767 mark_closed(fileno(input));
2768 fclose(input);
2769 }
Eric Andersen25f27032001-04-26 23:22:31 +00002770 }
2771 input=stdin;
Eric Andersenc7bda1c2004-03-15 08:29:22 +00002772
Eric Andersen25f27032001-04-26 23:22:31 +00002773 while ((opt = getopt(argc, argv, "c:xif")) > 0) {
2774 switch (opt) {
2775 case 'c':
2776 {
2777 global_argv = argv+optind;
2778 global_argc = argc-optind;
Eric Andersen4c9b68f2002-04-13 12:33:41 +00002779 opt = parse_string_outer(optarg, FLAG_PARSE_SEMICOLON);
Eric Andersene67c3ce2001-05-02 02:09:36 +00002780 goto final_return;
Eric Andersen25f27032001-04-26 23:22:31 +00002781 }
2782 break;
2783 case 'i':
2784 interactive++;
2785 break;
2786 case 'f':
2787 fake_mode++;
2788 break;
2789 default:
Eric Andersen9ffb7dd2001-05-19 03:00:46 +00002790#ifndef BB_VER
Eric Andersen25f27032001-04-26 23:22:31 +00002791 fprintf(stderr, "Usage: sh [FILE]...\n"
2792 " or: sh -c command [args]...\n\n");
2793 exit(EXIT_FAILURE);
Eric Andersen9ffb7dd2001-05-19 03:00:46 +00002794#else
Manuel Novoa III cad53642003-03-19 09:13:01 +00002795 bb_show_usage();
Eric Andersen9ffb7dd2001-05-19 03:00:46 +00002796#endif
Eric Andersen25f27032001-04-26 23:22:31 +00002797 }
2798 }
2799 /* A shell is interactive if the `-i' flag was given, or if all of
2800 * the following conditions are met:
2801 * no -c command
2802 * no arguments remaining or the -s flag given
2803 * standard input is a terminal
2804 * standard output is a terminal
2805 * Refer to Posix.2, the description of the `sh' utility. */
2806 if (argv[optind]==NULL && input==stdin &&
Eric Andersen70060d22004-03-27 10:02:48 +00002807 isatty(STDIN_FILENO) && isatty(STDOUT_FILENO)) {
Eric Andersen25f27032001-04-26 23:22:31 +00002808 interactive++;
2809 }
Eric Andersene67c3ce2001-05-02 02:09:36 +00002810
2811 debug_printf("\ninteractive=%d\n", interactive);
Eric Andersen25f27032001-04-26 23:22:31 +00002812 if (interactive) {
2813 /* Looks like they want an interactive shell */
Eric Andersenc7bda1c2004-03-15 08:29:22 +00002814#ifndef CONFIG_FEATURE_SH_EXTRA_QUIET
Eric Andersend63dee42001-10-19 00:22:23 +00002815 printf( "\n\n" BB_BANNER " hush - the humble shell v0.01 (testing)\n");
2816 printf( "Enter 'help' for a list of built-in commands.\n\n");
2817#endif
Eric Andersen52a97ca2001-06-22 06:49:26 +00002818 setup_job_control();
Eric Andersenada18ff2001-05-21 16:18:22 +00002819 }
Eric Andersenc7bda1c2004-03-15 08:29:22 +00002820
Eric Andersenada18ff2001-05-21 16:18:22 +00002821 if (argv[optind]==NULL) {
Eric Andersene67c3ce2001-05-02 02:09:36 +00002822 opt=parse_file_outer(stdin);
2823 goto final_return;
Eric Andersen25f27032001-04-26 23:22:31 +00002824 }
Eric Andersen25f27032001-04-26 23:22:31 +00002825
2826 debug_printf("\nrunning script '%s'\n", argv[optind]);
2827 global_argv = argv+optind;
2828 global_argc = argc-optind;
Manuel Novoa III cad53642003-03-19 09:13:01 +00002829 input = bb_xfopen(argv[optind], "r");
Eric Andersen25f27032001-04-26 23:22:31 +00002830 opt = parse_file_outer(input);
2831
Eric Andersenbdfd0d72001-10-24 05:00:29 +00002832#ifdef CONFIG_FEATURE_CLEAN_UP
Eric Andersenaeb44c42001-05-22 20:29:00 +00002833 fclose(input);
Manuel Novoa III cad53642003-03-19 09:13:01 +00002834 if (cwd && cwd != bb_msg_unknown)
Eric Andersenaeb44c42001-05-22 20:29:00 +00002835 free((char*)cwd);
2836 {
2837 struct variables *cur, *tmp;
2838 for(cur = top_vars; cur; cur = tmp) {
2839 tmp = cur->next;
2840 if (!cur->flg_read_only) {
2841 free(cur->name);
2842 free(cur->value);
2843 free(cur);
2844 }
2845 }
2846 }
Eric Andersen25f27032001-04-26 23:22:31 +00002847#endif
2848
Eric Andersene67c3ce2001-05-02 02:09:36 +00002849final_return:
2850 return(opt?opt:last_return_code);
Eric Andersen25f27032001-04-26 23:22:31 +00002851}
Eric Andersen4c9b68f2002-04-13 12:33:41 +00002852
2853static char *insert_var_value(char *inp)
2854{
2855 int res_str_len = 0;
2856 int len;
2857 int done = 0;
2858 char *p, *p1, *res_str = NULL;
Eric Andersenc7bda1c2004-03-15 08:29:22 +00002859
Eric Andersen4c9b68f2002-04-13 12:33:41 +00002860 while ((p = strchr(inp, SPECIAL_VAR_SYMBOL))) {
2861 if (p != inp) {
2862 len = p - inp;
2863 res_str = xrealloc(res_str, (res_str_len + len));
2864 strncpy((res_str + res_str_len), inp, len);
2865 res_str_len += len;
2866 }
2867 inp = ++p;
2868 p = strchr(inp, SPECIAL_VAR_SYMBOL);
2869 *p = '\0';
2870 if ((p1 = lookup_param(inp))) {
2871 len = res_str_len + strlen(p1);
2872 res_str = xrealloc(res_str, (1 + len));
2873 strcpy((res_str + res_str_len), p1);
2874 res_str_len = len;
Eric Andersenc7bda1c2004-03-15 08:29:22 +00002875 }
Eric Andersen4c9b68f2002-04-13 12:33:41 +00002876 *p = SPECIAL_VAR_SYMBOL;
2877 inp = ++p;
2878 done = 1;
2879 }
2880 if (done) {
2881 res_str = xrealloc(res_str, (1 + res_str_len + strlen(inp)));
2882 strcpy((res_str + res_str_len), inp);
2883 while ((p = strchr(res_str, '\n'))) {
2884 *p = ' ';
2885 }
2886 }
2887 return (res_str == NULL) ? inp : res_str;
2888}
2889
2890static char **make_list_in(char **inp, char *name)
2891{
2892 int len, i;
2893 int name_len = strlen(name);
2894 int n = 0;
2895 char **list;
2896 char *p1, *p2, *p3;
Eric Andersenc7bda1c2004-03-15 08:29:22 +00002897
2898 /* create list of variable values */
Eric Andersen4c9b68f2002-04-13 12:33:41 +00002899 list = xmalloc(sizeof(*list));
2900 for (i = 0; inp[i]; i++) {
2901 p3 = insert_var_value(inp[i]);
2902 p1 = p3;
2903 while (*p1) {
2904 if ((*p1 == ' ')) {
2905 p1++;
2906 continue;
2907 }
2908 if ((p2 = strchr(p1, ' '))) {
2909 len = p2 - p1;
Eric Andersenc7bda1c2004-03-15 08:29:22 +00002910 } else {
Eric Andersen4c9b68f2002-04-13 12:33:41 +00002911 len = strlen(p1);
2912 p2 = p1 + len;
2913 }
Eric Andersenc7bda1c2004-03-15 08:29:22 +00002914 /* we use n + 2 in realloc for list,because we add
Eric Andersen4c9b68f2002-04-13 12:33:41 +00002915 * new element and then we will add NULL element */
Eric Andersenc7bda1c2004-03-15 08:29:22 +00002916 list = xrealloc(list, sizeof(*list) * (n + 2));
Eric Andersen4c9b68f2002-04-13 12:33:41 +00002917 list[n] = xmalloc(2 + name_len + len);
2918 strcpy(list[n], name);
2919 strcat(list[n], "=");
2920 strncat(list[n], p1, len);
2921 list[n++][name_len + len + 1] = '\0';
2922 p1 = p2;
2923 }
2924 if (p3 != inp[i]) free(p3);
2925 }
2926 list[n] = NULL;
2927 return list;
Eric Andersenc7bda1c2004-03-15 08:29:22 +00002928}
Eric Andersen4c9b68f2002-04-13 12:33:41 +00002929
2930/* Make new string for parser */
2931static char * make_string(char ** inp)
2932{
2933 char *p;
2934 char *str = NULL;
2935 int n;
2936 int len = 2;
2937
2938 for (n = 0; inp[n]; n++) {
2939 p = insert_var_value(inp[n]);
2940 str = xrealloc(str, (len + strlen(p)));
2941 if (n) {
2942 strcat(str, " ");
2943 } else {
2944 *str = '\0';
2945 }
2946 strcat(str, p);
2947 len = strlen(str) + 3;
2948 if (p != inp[n]) free(p);
2949 }
2950 len = strlen(str);
2951 *(str + len) = '\n';
2952 *(str + len + 1) = '\0';
2953 return str;
2954}