1 /* 2 * sh.c -- a prototype Bourne shell grammar parser 3 * Intended to follow the original Thompson and Ritchie 4 * "small and simple is beautiful" philosophy, which 5 * incidentally is a good match to today's BusyBox. 6 * 7 * Copyright (C) 2000,2001 Larry Doolittle <larry@doolittle.boa.org> 8 * 9 * Credits: 10 * The parser routines proper are all original material, first 11 * written Dec 2000 and Jan 2001 by Larry Doolittle. 12 * The execution engine, the builtins, and much of the underlying 13 * support has been adapted from busybox-0.49pre's lash, 14 * which is Copyright (C) 2000 by Lineo, Inc., and 15 * written by Erik Andersen <andersen@lineo.com>, <andersee@debian.org>. 16 * That, in turn, is based in part on ladsh.c, by Michael K. Johnson and 17 * Erik W. Troan, which they placed in the public domain. I don't know 18 * how much of the Johnson/Troan code has survived the repeated rewrites. 19 * Other credits: 20 * b_addchr() derived from similar w_addchar function in glibc-2.2 21 * setup_redirect(), redirect_opt_num(), and big chunks of main() 22 * and many builtins derived from contributions by Erik Andersen 23 * miscellaneous bugfixes from Matt Kraai 24 * 25 * There are two big (and related) architecture differences between 26 * this parser and the lash parser. One is that this version is 27 * actually designed from the ground up to understand nearly all 28 * of the Bourne grammar. The second, consequential change is that 29 * the parser and input reader have been turned inside out. Now, 30 * the parser is in control, and asks for input as needed. The old 31 * way had the input reader in control, and it asked for parsing to 32 * take place as needed. The new way makes it much easier to properly 33 * handle the recursion implicit in the various substitutions, especially 34 * across continuation lines. 35 * 36 * Bash grammar not implemented: (how many of these were in original sh?) 37 * $@ (those sure look like weird quoting rules) 38 * $_ 39 * ! negation operator for pipes 40 * &> and >& redirection of stdout+stderr 41 * Brace Expansion 42 * Tilde Expansion 43 * fancy forms of Parameter Expansion 44 * aliases 45 * Arithmetic Expansion 46 * <(list) and >(list) Process Substitution 47 * reserved words: case, esac, select, function 48 * Here Documents ( << word ) 49 * Functions 50 * Major bugs: 51 * job handling woefully incomplete and buggy 52 * reserved word execution woefully incomplete and buggy 53 * to-do: 54 * port selected bugfixes from post-0.49 busybox lash - done? 55 * finish implementing reserved words: for, while, until, do, done 56 * change { and } from special chars to reserved words 57 * builtins: break, continue, eval, return, set, trap, ulimit 58 * test magic exec 59 * handle children going into background 60 * clean up recognition of null pipes 61 * check setting of global_argc and global_argv 62 * control-C handling, probably with longjmp 63 * follow IFS rules more precisely, including update semantics 64 * figure out what to do with backslash-newline 65 * explain why we use signal instead of sigaction 66 * propagate syntax errors, die on resource errors? 67 * continuation lines, both explicit and implicit - done? 68 * memory leak finding and plugging - done? 69 * more testing, especially quoting rules and redirection 70 * document how quoting rules not precisely followed for variable assignments 71 * maybe change map[] to use 2-bit entries 72 * (eventually) remove all the printf's 73 * 74 * SPDX-License-Identifier: GPL-2.0+ 75 */ 76 77 #define __U_BOOT__ 78 #ifdef __U_BOOT__ 79 #include <malloc.h> /* malloc, free, realloc*/ 80 #include <linux/ctype.h> /* isalpha, isdigit */ 81 #include <common.h> /* readline */ 82 #include <cli.h> 83 #include <cli_hush.h> 84 #include <command.h> /* find_cmd */ 85 #ifndef CONFIG_SYS_PROMPT_HUSH_PS2 86 #define CONFIG_SYS_PROMPT_HUSH_PS2 "> " 87 #endif 88 #endif 89 #ifndef __U_BOOT__ 90 #include <ctype.h> /* isalpha, isdigit */ 91 #include <unistd.h> /* getpid */ 92 #include <stdlib.h> /* getenv, atoi */ 93 #include <string.h> /* strchr */ 94 #include <stdio.h> /* popen etc. */ 95 #include <glob.h> /* glob, of course */ 96 #include <stdarg.h> /* va_list */ 97 #include <errno.h> 98 #include <fcntl.h> 99 #include <getopt.h> /* should be pretty obvious */ 100 101 #include <sys/stat.h> /* ulimit */ 102 #include <sys/types.h> 103 #include <sys/wait.h> 104 #include <signal.h> 105 106 /* #include <dmalloc.h> */ 107 108 #if 1 109 #include "busybox.h" 110 #include "cmdedit.h" 111 #else 112 #define applet_name "hush" 113 #include "standalone.h" 114 #define hush_main main 115 #undef CONFIG_FEATURE_SH_FANCY_PROMPT 116 #define BB_BANNER 117 #endif 118 #endif 119 #define SPECIAL_VAR_SYMBOL 03 120 #define SUBSTED_VAR_SYMBOL 04 121 #ifndef __U_BOOT__ 122 #define FLAG_EXIT_FROM_LOOP 1 123 #define FLAG_PARSE_SEMICOLON (1 << 1) /* symbol ';' is special for parser */ 124 #define FLAG_REPARSING (1 << 2) /* >= 2nd pass */ 125 126 #endif 127 128 #ifdef __U_BOOT__ 129 DECLARE_GLOBAL_DATA_PTR; 130 131 #define EXIT_SUCCESS 0 132 #define EOF -1 133 #define syntax() syntax_err() 134 #define xstrdup strdup 135 #define error_msg printf 136 #else 137 typedef enum { 138 REDIRECT_INPUT = 1, 139 REDIRECT_OVERWRITE = 2, 140 REDIRECT_APPEND = 3, 141 REDIRECT_HEREIS = 4, 142 REDIRECT_IO = 5 143 } redir_type; 144 145 /* The descrip member of this structure is only used to make debugging 146 * output pretty */ 147 struct {int mode; int default_fd; char *descrip;} redir_table[] = { 148 { 0, 0, "()" }, 149 { O_RDONLY, 0, "<" }, 150 { O_CREAT|O_TRUNC|O_WRONLY, 1, ">" }, 151 { O_CREAT|O_APPEND|O_WRONLY, 1, ">>" }, 152 { O_RDONLY, -1, "<<" }, 153 { O_RDWR, 1, "<>" } 154 }; 155 #endif 156 157 typedef enum { 158 PIPE_SEQ = 1, 159 PIPE_AND = 2, 160 PIPE_OR = 3, 161 PIPE_BG = 4, 162 } pipe_style; 163 164 /* might eventually control execution */ 165 typedef enum { 166 RES_NONE = 0, 167 RES_IF = 1, 168 RES_THEN = 2, 169 RES_ELIF = 3, 170 RES_ELSE = 4, 171 RES_FI = 5, 172 RES_FOR = 6, 173 RES_WHILE = 7, 174 RES_UNTIL = 8, 175 RES_DO = 9, 176 RES_DONE = 10, 177 RES_XXXX = 11, 178 RES_IN = 12, 179 RES_SNTX = 13 180 } reserved_style; 181 #define FLAG_END (1<<RES_NONE) 182 #define FLAG_IF (1<<RES_IF) 183 #define FLAG_THEN (1<<RES_THEN) 184 #define FLAG_ELIF (1<<RES_ELIF) 185 #define FLAG_ELSE (1<<RES_ELSE) 186 #define FLAG_FI (1<<RES_FI) 187 #define FLAG_FOR (1<<RES_FOR) 188 #define FLAG_WHILE (1<<RES_WHILE) 189 #define FLAG_UNTIL (1<<RES_UNTIL) 190 #define FLAG_DO (1<<RES_DO) 191 #define FLAG_DONE (1<<RES_DONE) 192 #define FLAG_IN (1<<RES_IN) 193 #define FLAG_START (1<<RES_XXXX) 194 195 /* This holds pointers to the various results of parsing */ 196 struct p_context { 197 struct child_prog *child; 198 struct pipe *list_head; 199 struct pipe *pipe; 200 #ifndef __U_BOOT__ 201 struct redir_struct *pending_redirect; 202 #endif 203 reserved_style w; 204 int old_flag; /* for figuring out valid reserved words */ 205 struct p_context *stack; 206 int type; /* define type of parser : ";$" common or special symbol */ 207 /* How about quoting status? */ 208 }; 209 210 #ifndef __U_BOOT__ 211 struct redir_struct { 212 redir_type type; /* type of redirection */ 213 int fd; /* file descriptor being redirected */ 214 int dup; /* -1, or file descriptor being duplicated */ 215 struct redir_struct *next; /* pointer to the next redirect in the list */ 216 glob_t word; /* *word.gl_pathv is the filename */ 217 }; 218 #endif 219 220 struct child_prog { 221 #ifndef __U_BOOT__ 222 pid_t pid; /* 0 if exited */ 223 #endif 224 char **argv; /* program name and arguments */ 225 /* was quoted when parsed; copy of struct o_string.nonnull field */ 226 int *argv_nonnull; 227 #ifdef __U_BOOT__ 228 int argc; /* number of program arguments */ 229 #endif 230 struct pipe *group; /* if non-NULL, first in group or subshell */ 231 #ifndef __U_BOOT__ 232 int subshell; /* flag, non-zero if group must be forked */ 233 struct redir_struct *redirects; /* I/O redirections */ 234 glob_t glob_result; /* result of parameter globbing */ 235 int is_stopped; /* is the program currently running? */ 236 struct pipe *family; /* pointer back to the child's parent pipe */ 237 #endif 238 int sp; /* number of SPECIAL_VAR_SYMBOL */ 239 int type; 240 }; 241 242 struct pipe { 243 #ifndef __U_BOOT__ 244 int jobid; /* job number */ 245 #endif 246 int num_progs; /* total number of programs in job */ 247 #ifndef __U_BOOT__ 248 int running_progs; /* number of programs running */ 249 char *text; /* name of job */ 250 char *cmdbuf; /* buffer various argv's point into */ 251 pid_t pgrp; /* process group ID for the job */ 252 #endif 253 struct child_prog *progs; /* array of commands in pipe */ 254 struct pipe *next; /* to track background commands */ 255 #ifndef __U_BOOT__ 256 int stopped_progs; /* number of programs alive, but stopped */ 257 int job_context; /* bitmask defining current context */ 258 #endif 259 pipe_style followup; /* PIPE_BG, PIPE_SEQ, PIPE_OR, PIPE_AND */ 260 reserved_style r_mode; /* supports if, for, while, until */ 261 }; 262 263 #ifndef __U_BOOT__ 264 struct close_me { 265 int fd; 266 struct close_me *next; 267 }; 268 #endif 269 270 struct variables { 271 char *name; 272 char *value; 273 int flg_export; 274 int flg_read_only; 275 struct variables *next; 276 }; 277 278 /* globals, connect us to the outside world 279 * the first three support $?, $#, and $1 */ 280 #ifndef __U_BOOT__ 281 char **global_argv; 282 unsigned int global_argc; 283 #endif 284 static unsigned int last_return_code; 285 #ifndef __U_BOOT__ 286 extern char **environ; /* This is in <unistd.h>, but protected with __USE_GNU */ 287 #endif 288 289 /* "globals" within this file */ 290 static uchar *ifs; 291 static char map[256]; 292 #ifndef __U_BOOT__ 293 static int fake_mode; 294 static int interactive; 295 static struct close_me *close_me_head; 296 static const char *cwd; 297 static struct pipe *job_list; 298 static unsigned int last_bg_pid; 299 static unsigned int last_jobid; 300 static unsigned int shell_terminal; 301 static char *PS1; 302 static char *PS2; 303 struct variables shell_ver = { "HUSH_VERSION", "0.01", 1, 1, 0 }; 304 struct variables *top_vars = &shell_ver; 305 #else 306 static int flag_repeat = 0; 307 static int do_repeat = 0; 308 static struct variables *top_vars = NULL ; 309 #endif /*__U_BOOT__ */ 310 311 #define B_CHUNK (100) 312 #define B_NOSPAC 1 313 314 typedef struct { 315 char *data; 316 int length; 317 int maxlen; 318 int quote; 319 int nonnull; 320 } o_string; 321 #define NULL_O_STRING {NULL,0,0,0,0} 322 /* used for initialization: 323 o_string foo = NULL_O_STRING; */ 324 325 /* I can almost use ordinary FILE *. Is open_memstream() universally 326 * available? Where is it documented? */ 327 struct in_str { 328 const char *p; 329 #ifndef __U_BOOT__ 330 char peek_buf[2]; 331 #endif 332 int __promptme; 333 int promptmode; 334 #ifndef __U_BOOT__ 335 FILE *file; 336 #endif 337 int (*get) (struct in_str *); 338 int (*peek) (struct in_str *); 339 }; 340 #define b_getch(input) ((input)->get(input)) 341 #define b_peek(input) ((input)->peek(input)) 342 343 #ifndef __U_BOOT__ 344 #define JOB_STATUS_FORMAT "[%d] %-22s %.40s\n" 345 346 struct built_in_command { 347 char *cmd; /* name */ 348 char *descr; /* description */ 349 int (*function) (struct child_prog *); /* function ptr */ 350 }; 351 #endif 352 353 /* define DEBUG_SHELL for debugging output (obviously ;-)) */ 354 #if 0 355 #define DEBUG_SHELL 356 #endif 357 358 /* This should be in utility.c */ 359 #ifdef DEBUG_SHELL 360 #ifndef __U_BOOT__ 361 static void debug_printf(const char *format, ...) 362 { 363 va_list args; 364 va_start(args, format); 365 vfprintf(stderr, format, args); 366 va_end(args); 367 } 368 #else 369 #define debug_printf(fmt,args...) printf (fmt ,##args) 370 #endif 371 #else 372 static inline void debug_printf(const char *format, ...) { } 373 #endif 374 #define final_printf debug_printf 375 376 #ifdef __U_BOOT__ 377 static void syntax_err(void) { 378 printf("syntax error\n"); 379 } 380 #else 381 static void __syntax(char *file, int line) { 382 error_msg("syntax error %s:%d", file, line); 383 } 384 #define syntax() __syntax(__FILE__, __LINE__) 385 #endif 386 387 #ifdef __U_BOOT__ 388 static void *xmalloc(size_t size); 389 static void *xrealloc(void *ptr, size_t size); 390 #else 391 /* Index of subroutines: */ 392 /* function prototypes for builtins */ 393 static int builtin_cd(struct child_prog *child); 394 static int builtin_env(struct child_prog *child); 395 static int builtin_eval(struct child_prog *child); 396 static int builtin_exec(struct child_prog *child); 397 static int builtin_exit(struct child_prog *child); 398 static int builtin_export(struct child_prog *child); 399 static int builtin_fg_bg(struct child_prog *child); 400 static int builtin_help(struct child_prog *child); 401 static int builtin_jobs(struct child_prog *child); 402 static int builtin_pwd(struct child_prog *child); 403 static int builtin_read(struct child_prog *child); 404 static int builtin_set(struct child_prog *child); 405 static int builtin_shift(struct child_prog *child); 406 static int builtin_source(struct child_prog *child); 407 static int builtin_umask(struct child_prog *child); 408 static int builtin_unset(struct child_prog *child); 409 static int builtin_not_written(struct child_prog *child); 410 #endif 411 /* o_string manipulation: */ 412 static int b_check_space(o_string *o, int len); 413 static int b_addchr(o_string *o, int ch); 414 static void b_reset(o_string *o); 415 static int b_addqchr(o_string *o, int ch, int quote); 416 #ifndef __U_BOOT__ 417 static int b_adduint(o_string *o, unsigned int i); 418 #endif 419 /* in_str manipulations: */ 420 static int static_get(struct in_str *i); 421 static int static_peek(struct in_str *i); 422 static int file_get(struct in_str *i); 423 static int file_peek(struct in_str *i); 424 #ifndef __U_BOOT__ 425 static void setup_file_in_str(struct in_str *i, FILE *f); 426 #else 427 static void setup_file_in_str(struct in_str *i); 428 #endif 429 static void setup_string_in_str(struct in_str *i, const char *s); 430 #ifndef __U_BOOT__ 431 /* close_me manipulations: */ 432 static void mark_open(int fd); 433 static void mark_closed(int fd); 434 static void close_all(void); 435 #endif 436 /* "run" the final data structures: */ 437 static char *indenter(int i); 438 static int free_pipe_list(struct pipe *head, int indent); 439 static int free_pipe(struct pipe *pi, int indent); 440 /* really run the final data structures: */ 441 #ifndef __U_BOOT__ 442 static int setup_redirects(struct child_prog *prog, int squirrel[]); 443 #endif 444 static int run_list_real(struct pipe *pi); 445 #ifndef __U_BOOT__ 446 static void pseudo_exec(struct child_prog *child) __attribute__ ((noreturn)); 447 #endif 448 static int run_pipe_real(struct pipe *pi); 449 /* extended glob support: */ 450 #ifndef __U_BOOT__ 451 static int globhack(const char *src, int flags, glob_t *pglob); 452 static int glob_needed(const char *s); 453 static int xglob(o_string *dest, int flags, glob_t *pglob); 454 #endif 455 /* variable assignment: */ 456 static int is_assignment(const char *s); 457 /* data structure manipulation: */ 458 #ifndef __U_BOOT__ 459 static int setup_redirect(struct p_context *ctx, int fd, redir_type style, struct in_str *input); 460 #endif 461 static void initialize_context(struct p_context *ctx); 462 static int done_word(o_string *dest, struct p_context *ctx); 463 static int done_command(struct p_context *ctx); 464 static int done_pipe(struct p_context *ctx, pipe_style type); 465 /* primary string parsing: */ 466 #ifndef __U_BOOT__ 467 static int redirect_dup_num(struct in_str *input); 468 static int redirect_opt_num(o_string *o); 469 static int process_command_subs(o_string *dest, struct p_context *ctx, struct in_str *input, int subst_end); 470 static int parse_group(o_string *dest, struct p_context *ctx, struct in_str *input, int ch); 471 #endif 472 static char *lookup_param(char *src); 473 static char *make_string(char **inp, int *nonnull); 474 static int handle_dollar(o_string *dest, struct p_context *ctx, struct in_str *input); 475 #ifndef __U_BOOT__ 476 static int parse_string(o_string *dest, struct p_context *ctx, const char *src); 477 #endif 478 static int parse_stream(o_string *dest, struct p_context *ctx, struct in_str *input0, int end_trigger); 479 /* setup: */ 480 static int parse_stream_outer(struct in_str *inp, int flag); 481 #ifndef __U_BOOT__ 482 static int parse_string_outer(const char *s, int flag); 483 static int parse_file_outer(FILE *f); 484 #endif 485 #ifndef __U_BOOT__ 486 /* job management: */ 487 static int checkjobs(struct pipe* fg_pipe); 488 static void insert_bg_job(struct pipe *pi); 489 static void remove_bg_job(struct pipe *pi); 490 #endif 491 /* local variable support */ 492 static char **make_list_in(char **inp, char *name); 493 static char *insert_var_value(char *inp); 494 static char *insert_var_value_sub(char *inp, int tag_subst); 495 496 #ifndef __U_BOOT__ 497 /* Table of built-in functions. They can be forked or not, depending on 498 * context: within pipes, they fork. As simple commands, they do not. 499 * When used in non-forking context, they can change global variables 500 * in the parent shell process. If forked, of course they can not. 501 * For example, 'unset foo | whatever' will parse and run, but foo will 502 * still be set at the end. */ 503 static struct built_in_command bltins[] = { 504 {"bg", "Resume a job in the background", builtin_fg_bg}, 505 {"break", "Exit for, while or until loop", builtin_not_written}, 506 {"cd", "Change working directory", builtin_cd}, 507 {"continue", "Continue for, while or until loop", builtin_not_written}, 508 {"env", "Print all environment variables", builtin_env}, 509 {"eval", "Construct and run shell command", builtin_eval}, 510 {"exec", "Exec command, replacing this shell with the exec'd process", 511 builtin_exec}, 512 {"exit", "Exit from shell()", builtin_exit}, 513 {"export", "Set environment variable", builtin_export}, 514 {"fg", "Bring job into the foreground", builtin_fg_bg}, 515 {"jobs", "Lists the active jobs", builtin_jobs}, 516 {"pwd", "Print current directory", builtin_pwd}, 517 {"read", "Input environment variable", builtin_read}, 518 {"return", "Return from a function", builtin_not_written}, 519 {"set", "Set/unset shell local variables", builtin_set}, 520 {"shift", "Shift positional parameters", builtin_shift}, 521 {"trap", "Trap signals", builtin_not_written}, 522 {"ulimit","Controls resource limits", builtin_not_written}, 523 {"umask","Sets file creation mask", builtin_umask}, 524 {"unset", "Unset environment variable", builtin_unset}, 525 {".", "Source-in and run commands in a file", builtin_source}, 526 {"help", "List shell built-in commands", builtin_help}, 527 {NULL, NULL, NULL} 528 }; 529 530 static const char *set_cwd(void) 531 { 532 if(cwd==unknown) 533 cwd = NULL; /* xgetcwd(arg) called free(arg) */ 534 cwd = xgetcwd((char *)cwd); 535 if (!cwd) 536 cwd = unknown; 537 return cwd; 538 } 539 540 /* built-in 'eval' handler */ 541 static int builtin_eval(struct child_prog *child) 542 { 543 char *str = NULL; 544 int rcode = EXIT_SUCCESS; 545 546 if (child->argv[1]) { 547 str = make_string(child->argv + 1); 548 parse_string_outer(str, FLAG_EXIT_FROM_LOOP | 549 FLAG_PARSE_SEMICOLON); 550 free(str); 551 rcode = last_return_code; 552 } 553 return rcode; 554 } 555 556 /* built-in 'cd <path>' handler */ 557 static int builtin_cd(struct child_prog *child) 558 { 559 char *newdir; 560 if (child->argv[1] == NULL) 561 newdir = getenv("HOME"); 562 else 563 newdir = child->argv[1]; 564 if (chdir(newdir)) { 565 printf("cd: %s: %s\n", newdir, strerror(errno)); 566 return EXIT_FAILURE; 567 } 568 set_cwd(); 569 return EXIT_SUCCESS; 570 } 571 572 /* built-in 'env' handler */ 573 static int builtin_env(struct child_prog *dummy) 574 { 575 char **e = environ; 576 if (e == NULL) return EXIT_FAILURE; 577 for (; *e; e++) { 578 puts(*e); 579 } 580 return EXIT_SUCCESS; 581 } 582 583 /* built-in 'exec' handler */ 584 static int builtin_exec(struct child_prog *child) 585 { 586 if (child->argv[1] == NULL) 587 return EXIT_SUCCESS; /* Really? */ 588 child->argv++; 589 pseudo_exec(child); 590 /* never returns */ 591 } 592 593 /* built-in 'exit' handler */ 594 static int builtin_exit(struct child_prog *child) 595 { 596 if (child->argv[1] == NULL) 597 exit(last_return_code); 598 exit (atoi(child->argv[1])); 599 } 600 601 /* built-in 'export VAR=value' handler */ 602 static int builtin_export(struct child_prog *child) 603 { 604 int res = 0; 605 char *name = child->argv[1]; 606 607 if (name == NULL) { 608 return (builtin_env(child)); 609 } 610 611 name = strdup(name); 612 613 if(name) { 614 char *value = strchr(name, '='); 615 616 if (!value) { 617 char *tmp; 618 /* They are exporting something without an =VALUE */ 619 620 value = get_local_var(name); 621 if (value) { 622 size_t ln = strlen(name); 623 624 tmp = realloc(name, ln+strlen(value)+2); 625 if(tmp==NULL) 626 res = -1; 627 else { 628 sprintf(tmp+ln, "=%s", value); 629 name = tmp; 630 } 631 } else { 632 /* bash does not return an error when trying to export 633 * an undefined variable. Do likewise. */ 634 res = 1; 635 } 636 } 637 } 638 if (res<0) 639 perror_msg("export"); 640 else if(res==0) 641 res = set_local_var(name, 1); 642 else 643 res = 0; 644 free(name); 645 return res; 646 } 647 648 /* built-in 'fg' and 'bg' handler */ 649 static int builtin_fg_bg(struct child_prog *child) 650 { 651 int i, jobnum; 652 struct pipe *pi=NULL; 653 654 if (!interactive) 655 return EXIT_FAILURE; 656 /* If they gave us no args, assume they want the last backgrounded task */ 657 if (!child->argv[1]) { 658 for (pi = job_list; pi; pi = pi->next) { 659 if (pi->jobid == last_jobid) { 660 break; 661 } 662 } 663 if (!pi) { 664 error_msg("%s: no current job", child->argv[0]); 665 return EXIT_FAILURE; 666 } 667 } else { 668 if (sscanf(child->argv[1], "%%%d", &jobnum) != 1) { 669 error_msg("%s: bad argument '%s'", child->argv[0], child->argv[1]); 670 return EXIT_FAILURE; 671 } 672 for (pi = job_list; pi; pi = pi->next) { 673 if (pi->jobid == jobnum) { 674 break; 675 } 676 } 677 if (!pi) { 678 error_msg("%s: %d: no such job", child->argv[0], jobnum); 679 return EXIT_FAILURE; 680 } 681 } 682 683 if (*child->argv[0] == 'f') { 684 /* Put the job into the foreground. */ 685 tcsetpgrp(shell_terminal, pi->pgrp); 686 } 687 688 /* Restart the processes in the job */ 689 for (i = 0; i < pi->num_progs; i++) 690 pi->progs[i].is_stopped = 0; 691 692 if ( (i=kill(- pi->pgrp, SIGCONT)) < 0) { 693 if (i == ESRCH) { 694 remove_bg_job(pi); 695 } else { 696 perror_msg("kill (SIGCONT)"); 697 } 698 } 699 700 pi->stopped_progs = 0; 701 return EXIT_SUCCESS; 702 } 703 704 /* built-in 'help' handler */ 705 static int builtin_help(struct child_prog *dummy) 706 { 707 struct built_in_command *x; 708 709 printf("\nBuilt-in commands:\n"); 710 printf("-------------------\n"); 711 for (x = bltins; x->cmd; x++) { 712 if (x->descr==NULL) 713 continue; 714 printf("%s\t%s\n", x->cmd, x->descr); 715 } 716 printf("\n\n"); 717 return EXIT_SUCCESS; 718 } 719 720 /* built-in 'jobs' handler */ 721 static int builtin_jobs(struct child_prog *child) 722 { 723 struct pipe *job; 724 char *status_string; 725 726 for (job = job_list; job; job = job->next) { 727 if (job->running_progs == job->stopped_progs) 728 status_string = "Stopped"; 729 else 730 status_string = "Running"; 731 732 printf(JOB_STATUS_FORMAT, job->jobid, status_string, job->text); 733 } 734 return EXIT_SUCCESS; 735 } 736 737 738 /* built-in 'pwd' handler */ 739 static int builtin_pwd(struct child_prog *dummy) 740 { 741 puts(set_cwd()); 742 return EXIT_SUCCESS; 743 } 744 745 /* built-in 'read VAR' handler */ 746 static int builtin_read(struct child_prog *child) 747 { 748 int res; 749 750 if (child->argv[1]) { 751 char string[BUFSIZ]; 752 char *var = 0; 753 754 string[0] = 0; /* In case stdin has only EOF */ 755 /* read string */ 756 fgets(string, sizeof(string), stdin); 757 chomp(string); 758 var = malloc(strlen(child->argv[1])+strlen(string)+2); 759 if(var) { 760 sprintf(var, "%s=%s", child->argv[1], string); 761 res = set_local_var(var, 0); 762 } else 763 res = -1; 764 if (res) 765 fprintf(stderr, "read: %m\n"); 766 free(var); /* So not move up to avoid breaking errno */ 767 return res; 768 } else { 769 do res=getchar(); while(res!='\n' && res!=EOF); 770 return 0; 771 } 772 } 773 774 /* built-in 'set VAR=value' handler */ 775 static int builtin_set(struct child_prog *child) 776 { 777 char *temp = child->argv[1]; 778 struct variables *e; 779 780 if (temp == NULL) 781 for(e = top_vars; e; e=e->next) 782 printf("%s=%s\n", e->name, e->value); 783 else 784 set_local_var(temp, 0); 785 786 return EXIT_SUCCESS; 787 } 788 789 790 /* Built-in 'shift' handler */ 791 static int builtin_shift(struct child_prog *child) 792 { 793 int n=1; 794 if (child->argv[1]) { 795 n=atoi(child->argv[1]); 796 } 797 if (n>=0 && n<global_argc) { 798 /* XXX This probably breaks $0 */ 799 global_argc -= n; 800 global_argv += n; 801 return EXIT_SUCCESS; 802 } else { 803 return EXIT_FAILURE; 804 } 805 } 806 807 /* Built-in '.' handler (read-in and execute commands from file) */ 808 static int builtin_source(struct child_prog *child) 809 { 810 FILE *input; 811 int status; 812 813 if (child->argv[1] == NULL) 814 return EXIT_FAILURE; 815 816 /* XXX search through $PATH is missing */ 817 input = fopen(child->argv[1], "r"); 818 if (!input) { 819 error_msg("Couldn't open file '%s'", child->argv[1]); 820 return EXIT_FAILURE; 821 } 822 823 /* Now run the file */ 824 /* XXX argv and argc are broken; need to save old global_argv 825 * (pointer only is OK!) on this stack frame, 826 * set global_argv=child->argv+1, recurse, and restore. */ 827 mark_open(fileno(input)); 828 status = parse_file_outer(input); 829 mark_closed(fileno(input)); 830 fclose(input); 831 return (status); 832 } 833 834 static int builtin_umask(struct child_prog *child) 835 { 836 mode_t new_umask; 837 const char *arg = child->argv[1]; 838 char *end; 839 if (arg) { 840 new_umask=strtoul(arg, &end, 8); 841 if (*end!='\0' || end == arg) { 842 return EXIT_FAILURE; 843 } 844 } else { 845 printf("%.3o\n", (unsigned int) (new_umask=umask(0))); 846 } 847 umask(new_umask); 848 return EXIT_SUCCESS; 849 } 850 851 /* built-in 'unset VAR' handler */ 852 static int builtin_unset(struct child_prog *child) 853 { 854 /* bash returned already true */ 855 unset_local_var(child->argv[1]); 856 return EXIT_SUCCESS; 857 } 858 859 static int builtin_not_written(struct child_prog *child) 860 { 861 printf("builtin_%s not written\n",child->argv[0]); 862 return EXIT_FAILURE; 863 } 864 #endif 865 866 static int b_check_space(o_string *o, int len) 867 { 868 /* It would be easy to drop a more restrictive policy 869 * in here, such as setting a maximum string length */ 870 if (o->length + len > o->maxlen) { 871 char *old_data = o->data; 872 /* assert (data == NULL || o->maxlen != 0); */ 873 o->maxlen += max(2*len, B_CHUNK); 874 o->data = realloc(o->data, 1 + o->maxlen); 875 if (o->data == NULL) { 876 free(old_data); 877 } 878 } 879 return o->data == NULL; 880 } 881 882 static int b_addchr(o_string *o, int ch) 883 { 884 debug_printf("b_addchr: %c %d %p\n", ch, o->length, o); 885 if (b_check_space(o, 1)) return B_NOSPAC; 886 o->data[o->length] = ch; 887 o->length++; 888 o->data[o->length] = '\0'; 889 return 0; 890 } 891 892 static void b_reset(o_string *o) 893 { 894 o->length = 0; 895 o->nonnull = 0; 896 if (o->data != NULL) *o->data = '\0'; 897 } 898 899 static void b_free(o_string *o) 900 { 901 b_reset(o); 902 free(o->data); 903 o->data = NULL; 904 o->maxlen = 0; 905 } 906 907 /* My analysis of quoting semantics tells me that state information 908 * is associated with a destination, not a source. 909 */ 910 static int b_addqchr(o_string *o, int ch, int quote) 911 { 912 if (quote && strchr("*?[\\",ch)) { 913 int rc; 914 rc = b_addchr(o, '\\'); 915 if (rc) return rc; 916 } 917 return b_addchr(o, ch); 918 } 919 920 #ifndef __U_BOOT__ 921 static int b_adduint(o_string *o, unsigned int i) 922 { 923 int r; 924 char *p = simple_itoa(i); 925 /* no escape checking necessary */ 926 do r=b_addchr(o, *p++); while (r==0 && *p); 927 return r; 928 } 929 #endif 930 931 static int static_get(struct in_str *i) 932 { 933 int ch = *i->p++; 934 if (ch=='\0') return EOF; 935 return ch; 936 } 937 938 static int static_peek(struct in_str *i) 939 { 940 return *i->p; 941 } 942 943 #ifndef __U_BOOT__ 944 static inline void cmdedit_set_initial_prompt(void) 945 { 946 #ifndef CONFIG_FEATURE_SH_FANCY_PROMPT 947 PS1 = NULL; 948 #else 949 PS1 = getenv("PS1"); 950 if(PS1==0) 951 PS1 = "\\w \\$ "; 952 #endif 953 } 954 955 static inline void setup_prompt_string(int promptmode, char **prompt_str) 956 { 957 debug_printf("setup_prompt_string %d ",promptmode); 958 #ifndef CONFIG_FEATURE_SH_FANCY_PROMPT 959 /* Set up the prompt */ 960 if (promptmode == 1) { 961 free(PS1); 962 PS1=xmalloc(strlen(cwd)+4); 963 sprintf(PS1, "%s %s", cwd, ( geteuid() != 0 ) ? "$ ":"# "); 964 *prompt_str = PS1; 965 } else { 966 *prompt_str = PS2; 967 } 968 #else 969 *prompt_str = (promptmode==1)? PS1 : PS2; 970 #endif 971 debug_printf("result %s\n",*prompt_str); 972 } 973 #endif 974 975 static void get_user_input(struct in_str *i) 976 { 977 #ifndef __U_BOOT__ 978 char *prompt_str; 979 static char the_command[BUFSIZ]; 980 981 setup_prompt_string(i->promptmode, &prompt_str); 982 #ifdef CONFIG_FEATURE_COMMAND_EDITING 983 /* 984 ** enable command line editing only while a command line 985 ** is actually being read; otherwise, we'll end up bequeathing 986 ** atexit() handlers and other unwanted stuff to our 987 ** child processes (rob@sysgo.de) 988 */ 989 cmdedit_read_input(prompt_str, the_command); 990 #else 991 fputs(prompt_str, stdout); 992 fflush(stdout); 993 the_command[0]=fgetc(i->file); 994 the_command[1]='\0'; 995 #endif 996 fflush(stdout); 997 i->p = the_command; 998 #else 999 int n; 1000 static char the_command[CONFIG_SYS_CBSIZE + 1]; 1001 1002 #ifdef CONFIG_BOOT_RETRY_TIME 1003 # ifndef CONFIG_RESET_TO_RETRY 1004 # error "This currently only works with CONFIG_RESET_TO_RETRY enabled" 1005 # endif 1006 reset_cmd_timeout(); 1007 #endif 1008 i->__promptme = 1; 1009 if (i->promptmode == 1) { 1010 n = cli_readline(CONFIG_SYS_PROMPT); 1011 } else { 1012 n = cli_readline(CONFIG_SYS_PROMPT_HUSH_PS2); 1013 } 1014 #ifdef CONFIG_BOOT_RETRY_TIME 1015 if (n == -2) { 1016 puts("\nTimeout waiting for command\n"); 1017 # ifdef CONFIG_RESET_TO_RETRY 1018 do_reset(NULL, 0, 0, NULL); 1019 # else 1020 # error "This currently only works with CONFIG_RESET_TO_RETRY enabled" 1021 # endif 1022 } 1023 #endif 1024 if (n == -1 ) { 1025 flag_repeat = 0; 1026 i->__promptme = 0; 1027 } 1028 n = strlen(console_buffer); 1029 console_buffer[n] = '\n'; 1030 console_buffer[n+1]= '\0'; 1031 if (had_ctrlc()) flag_repeat = 0; 1032 clear_ctrlc(); 1033 do_repeat = 0; 1034 if (i->promptmode == 1) { 1035 if (console_buffer[0] == '\n'&& flag_repeat == 0) { 1036 strcpy(the_command,console_buffer); 1037 } 1038 else { 1039 if (console_buffer[0] != '\n') { 1040 strcpy(the_command,console_buffer); 1041 flag_repeat = 1; 1042 } 1043 else { 1044 do_repeat = 1; 1045 } 1046 } 1047 i->p = the_command; 1048 } 1049 else { 1050 if (console_buffer[0] != '\n') { 1051 if (strlen(the_command) + strlen(console_buffer) 1052 < CONFIG_SYS_CBSIZE) { 1053 n = strlen(the_command); 1054 the_command[n-1] = ' '; 1055 strcpy(&the_command[n],console_buffer); 1056 } 1057 else { 1058 the_command[0] = '\n'; 1059 the_command[1] = '\0'; 1060 flag_repeat = 0; 1061 } 1062 } 1063 if (i->__promptme == 0) { 1064 the_command[0] = '\n'; 1065 the_command[1] = '\0'; 1066 } 1067 i->p = console_buffer; 1068 } 1069 #endif 1070 } 1071 1072 /* This is the magic location that prints prompts 1073 * and gets data back from the user */ 1074 static int file_get(struct in_str *i) 1075 { 1076 int ch; 1077 1078 ch = 0; 1079 /* If there is data waiting, eat it up */ 1080 if (i->p && *i->p) { 1081 ch = *i->p++; 1082 } else { 1083 /* need to double check i->file because we might be doing something 1084 * more complicated by now, like sourcing or substituting. */ 1085 #ifndef __U_BOOT__ 1086 if (i->__promptme && interactive && i->file == stdin) { 1087 while(! i->p || (interactive && strlen(i->p)==0) ) { 1088 #else 1089 while(! i->p || strlen(i->p)==0 ) { 1090 #endif 1091 get_user_input(i); 1092 } 1093 i->promptmode=2; 1094 #ifndef __U_BOOT__ 1095 i->__promptme = 0; 1096 #endif 1097 if (i->p && *i->p) { 1098 ch = *i->p++; 1099 } 1100 #ifndef __U_BOOT__ 1101 } else { 1102 ch = fgetc(i->file); 1103 } 1104 1105 #endif 1106 debug_printf("b_getch: got a %d\n", ch); 1107 } 1108 #ifndef __U_BOOT__ 1109 if (ch == '\n') i->__promptme=1; 1110 #endif 1111 return ch; 1112 } 1113 1114 /* All the callers guarantee this routine will never be 1115 * used right after a newline, so prompting is not needed. 1116 */ 1117 static int file_peek(struct in_str *i) 1118 { 1119 #ifndef __U_BOOT__ 1120 if (i->p && *i->p) { 1121 #endif 1122 return *i->p; 1123 #ifndef __U_BOOT__ 1124 } else { 1125 i->peek_buf[0] = fgetc(i->file); 1126 i->peek_buf[1] = '\0'; 1127 i->p = i->peek_buf; 1128 debug_printf("b_peek: got a %d\n", *i->p); 1129 return *i->p; 1130 } 1131 #endif 1132 } 1133 1134 #ifndef __U_BOOT__ 1135 static void setup_file_in_str(struct in_str *i, FILE *f) 1136 #else 1137 static void setup_file_in_str(struct in_str *i) 1138 #endif 1139 { 1140 i->peek = file_peek; 1141 i->get = file_get; 1142 i->__promptme=1; 1143 i->promptmode=1; 1144 #ifndef __U_BOOT__ 1145 i->file = f; 1146 #endif 1147 i->p = NULL; 1148 } 1149 1150 static void setup_string_in_str(struct in_str *i, const char *s) 1151 { 1152 i->peek = static_peek; 1153 i->get = static_get; 1154 i->__promptme=1; 1155 i->promptmode=1; 1156 i->p = s; 1157 } 1158 1159 #ifndef __U_BOOT__ 1160 static void mark_open(int fd) 1161 { 1162 struct close_me *new = xmalloc(sizeof(struct close_me)); 1163 new->fd = fd; 1164 new->next = close_me_head; 1165 close_me_head = new; 1166 } 1167 1168 static void mark_closed(int fd) 1169 { 1170 struct close_me *tmp; 1171 if (close_me_head == NULL || close_me_head->fd != fd) 1172 error_msg_and_die("corrupt close_me"); 1173 tmp = close_me_head; 1174 close_me_head = close_me_head->next; 1175 free(tmp); 1176 } 1177 1178 static void close_all(void) 1179 { 1180 struct close_me *c; 1181 for (c=close_me_head; c; c=c->next) { 1182 close(c->fd); 1183 } 1184 close_me_head = NULL; 1185 } 1186 1187 /* squirrel != NULL means we squirrel away copies of stdin, stdout, 1188 * and stderr if they are redirected. */ 1189 static int setup_redirects(struct child_prog *prog, int squirrel[]) 1190 { 1191 int openfd, mode; 1192 struct redir_struct *redir; 1193 1194 for (redir=prog->redirects; redir; redir=redir->next) { 1195 if (redir->dup == -1 && redir->word.gl_pathv == NULL) { 1196 /* something went wrong in the parse. Pretend it didn't happen */ 1197 continue; 1198 } 1199 if (redir->dup == -1) { 1200 mode=redir_table[redir->type].mode; 1201 openfd = open(redir->word.gl_pathv[0], mode, 0666); 1202 if (openfd < 0) { 1203 /* this could get lost if stderr has been redirected, but 1204 bash and ash both lose it as well (though zsh doesn't!) */ 1205 perror_msg("error opening %s", redir->word.gl_pathv[0]); 1206 return 1; 1207 } 1208 } else { 1209 openfd = redir->dup; 1210 } 1211 1212 if (openfd != redir->fd) { 1213 if (squirrel && redir->fd < 3) { 1214 squirrel[redir->fd] = dup(redir->fd); 1215 } 1216 if (openfd == -3) { 1217 close(openfd); 1218 } else { 1219 dup2(openfd, redir->fd); 1220 if (redir->dup == -1) 1221 close (openfd); 1222 } 1223 } 1224 } 1225 return 0; 1226 } 1227 1228 static void restore_redirects(int squirrel[]) 1229 { 1230 int i, fd; 1231 for (i=0; i<3; i++) { 1232 fd = squirrel[i]; 1233 if (fd != -1) { 1234 /* No error checking. I sure wouldn't know what 1235 * to do with an error if I found one! */ 1236 dup2(fd, i); 1237 close(fd); 1238 } 1239 } 1240 } 1241 1242 /* never returns */ 1243 /* XXX no exit() here. If you don't exec, use _exit instead. 1244 * The at_exit handlers apparently confuse the calling process, 1245 * in particular stdin handling. Not sure why? */ 1246 static void pseudo_exec(struct child_prog *child) 1247 { 1248 int i, rcode; 1249 char *p; 1250 struct built_in_command *x; 1251 if (child->argv) { 1252 for (i=0; is_assignment(child->argv[i]); i++) { 1253 debug_printf("pid %d environment modification: %s\n",getpid(),child->argv[i]); 1254 p = insert_var_value(child->argv[i]); 1255 putenv(strdup(p)); 1256 if (p != child->argv[i]) free(p); 1257 } 1258 child->argv+=i; /* XXX this hack isn't so horrible, since we are about 1259 to exit, and therefore don't need to keep data 1260 structures consistent for free() use. */ 1261 /* If a variable is assigned in a forest, and nobody listens, 1262 * was it ever really set? 1263 */ 1264 if (child->argv[0] == NULL) { 1265 _exit(EXIT_SUCCESS); 1266 } 1267 1268 /* 1269 * Check if the command matches any of the builtins. 1270 * Depending on context, this might be redundant. But it's 1271 * easier to waste a few CPU cycles than it is to figure out 1272 * if this is one of those cases. 1273 */ 1274 for (x = bltins; x->cmd; x++) { 1275 if (strcmp(child->argv[0], x->cmd) == 0 ) { 1276 debug_printf("builtin exec %s\n", child->argv[0]); 1277 rcode = x->function(child); 1278 fflush(stdout); 1279 _exit(rcode); 1280 } 1281 } 1282 1283 /* Check if the command matches any busybox internal commands 1284 * ("applets") here. 1285 * FIXME: This feature is not 100% safe, since 1286 * BusyBox is not fully reentrant, so we have no guarantee the things 1287 * from the .bss are still zeroed, or that things from .data are still 1288 * at their defaults. We could exec ourself from /proc/self/exe, but I 1289 * really dislike relying on /proc for things. We could exec ourself 1290 * from global_argv[0], but if we are in a chroot, we may not be able 1291 * to find ourself... */ 1292 #ifdef CONFIG_FEATURE_SH_STANDALONE_SHELL 1293 { 1294 int argc_l; 1295 char** argv_l=child->argv; 1296 char *name = child->argv[0]; 1297 1298 #ifdef CONFIG_FEATURE_SH_APPLETS_ALWAYS_WIN 1299 /* Following discussions from November 2000 on the busybox mailing 1300 * list, the default configuration, (without 1301 * get_last_path_component()) lets the user force use of an 1302 * external command by specifying the full (with slashes) filename. 1303 * If you enable CONFIG_FEATURE_SH_APPLETS_ALWAYS_WIN then applets 1304 * _aways_ override external commands, so if you want to run 1305 * /bin/cat, it will use BusyBox cat even if /bin/cat exists on the 1306 * filesystem and is _not_ busybox. Some systems may want this, 1307 * most do not. */ 1308 name = get_last_path_component(name); 1309 #endif 1310 /* Count argc for use in a second... */ 1311 for(argc_l=0;*argv_l!=NULL; argv_l++, argc_l++); 1312 optind = 1; 1313 debug_printf("running applet %s\n", name); 1314 run_applet_by_name(name, argc_l, child->argv); 1315 } 1316 #endif 1317 debug_printf("exec of %s\n",child->argv[0]); 1318 execvp(child->argv[0],child->argv); 1319 perror_msg("couldn't exec: %s",child->argv[0]); 1320 _exit(1); 1321 } else if (child->group) { 1322 debug_printf("runtime nesting to group\n"); 1323 interactive=0; /* crucial!!!! */ 1324 rcode = run_list_real(child->group); 1325 /* OK to leak memory by not calling free_pipe_list, 1326 * since this process is about to exit */ 1327 _exit(rcode); 1328 } else { 1329 /* Can happen. See what bash does with ">foo" by itself. */ 1330 debug_printf("trying to pseudo_exec null command\n"); 1331 _exit(EXIT_SUCCESS); 1332 } 1333 } 1334 1335 static void insert_bg_job(struct pipe *pi) 1336 { 1337 struct pipe *thejob; 1338 1339 /* Linear search for the ID of the job to use */ 1340 pi->jobid = 1; 1341 for (thejob = job_list; thejob; thejob = thejob->next) 1342 if (thejob->jobid >= pi->jobid) 1343 pi->jobid = thejob->jobid + 1; 1344 1345 /* add thejob to the list of running jobs */ 1346 if (!job_list) { 1347 thejob = job_list = xmalloc(sizeof(*thejob)); 1348 } else { 1349 for (thejob = job_list; thejob->next; thejob = thejob->next) /* nothing */; 1350 thejob->next = xmalloc(sizeof(*thejob)); 1351 thejob = thejob->next; 1352 } 1353 1354 /* physically copy the struct job */ 1355 memcpy(thejob, pi, sizeof(struct pipe)); 1356 thejob->next = NULL; 1357 thejob->running_progs = thejob->num_progs; 1358 thejob->stopped_progs = 0; 1359 thejob->text = xmalloc(BUFSIZ); /* cmdedit buffer size */ 1360 1361 /*if (pi->progs[0] && pi->progs[0].argv && pi->progs[0].argv[0]) */ 1362 { 1363 char *bar=thejob->text; 1364 char **foo=pi->progs[0].argv; 1365 while(foo && *foo) { 1366 bar += sprintf(bar, "%s ", *foo++); 1367 } 1368 } 1369 1370 /* we don't wait for background thejobs to return -- append it 1371 to the list of backgrounded thejobs and leave it alone */ 1372 printf("[%d] %d\n", thejob->jobid, thejob->progs[0].pid); 1373 last_bg_pid = thejob->progs[0].pid; 1374 last_jobid = thejob->jobid; 1375 } 1376 1377 /* remove a backgrounded job */ 1378 static void remove_bg_job(struct pipe *pi) 1379 { 1380 struct pipe *prev_pipe; 1381 1382 if (pi == job_list) { 1383 job_list = pi->next; 1384 } else { 1385 prev_pipe = job_list; 1386 while (prev_pipe->next != pi) 1387 prev_pipe = prev_pipe->next; 1388 prev_pipe->next = pi->next; 1389 } 1390 if (job_list) 1391 last_jobid = job_list->jobid; 1392 else 1393 last_jobid = 0; 1394 1395 pi->stopped_progs = 0; 1396 free_pipe(pi, 0); 1397 free(pi); 1398 } 1399 1400 /* Checks to see if any processes have exited -- if they 1401 have, figure out why and see if a job has completed */ 1402 static int checkjobs(struct pipe* fg_pipe) 1403 { 1404 int attributes; 1405 int status; 1406 int prognum = 0; 1407 struct pipe *pi; 1408 pid_t childpid; 1409 1410 attributes = WUNTRACED; 1411 if (fg_pipe==NULL) { 1412 attributes |= WNOHANG; 1413 } 1414 1415 while ((childpid = waitpid(-1, &status, attributes)) > 0) { 1416 if (fg_pipe) { 1417 int i, rcode = 0; 1418 for (i=0; i < fg_pipe->num_progs; i++) { 1419 if (fg_pipe->progs[i].pid == childpid) { 1420 if (i==fg_pipe->num_progs-1) 1421 rcode=WEXITSTATUS(status); 1422 (fg_pipe->num_progs)--; 1423 return(rcode); 1424 } 1425 } 1426 } 1427 1428 for (pi = job_list; pi; pi = pi->next) { 1429 prognum = 0; 1430 while (prognum < pi->num_progs && pi->progs[prognum].pid != childpid) { 1431 prognum++; 1432 } 1433 if (prognum < pi->num_progs) 1434 break; 1435 } 1436 1437 if(pi==NULL) { 1438 debug_printf("checkjobs: pid %d was not in our list!\n", childpid); 1439 continue; 1440 } 1441 1442 if (WIFEXITED(status) || WIFSIGNALED(status)) { 1443 /* child exited */ 1444 pi->running_progs--; 1445 pi->progs[prognum].pid = 0; 1446 1447 if (!pi->running_progs) { 1448 printf(JOB_STATUS_FORMAT, pi->jobid, "Done", pi->text); 1449 remove_bg_job(pi); 1450 } 1451 } else { 1452 /* child stopped */ 1453 pi->stopped_progs++; 1454 pi->progs[prognum].is_stopped = 1; 1455 1456 #if 0 1457 /* Printing this stuff is a pain, since it tends to 1458 * overwrite the prompt an inconveinient moments. So 1459 * don't do that. */ 1460 if (pi->stopped_progs == pi->num_progs) { 1461 printf("\n"JOB_STATUS_FORMAT, pi->jobid, "Stopped", pi->text); 1462 } 1463 #endif 1464 } 1465 } 1466 1467 if (childpid == -1 && errno != ECHILD) 1468 perror_msg("waitpid"); 1469 1470 /* move the shell to the foreground */ 1471 /*if (interactive && tcsetpgrp(shell_terminal, getpgid(0))) */ 1472 /* perror_msg("tcsetpgrp-2"); */ 1473 return -1; 1474 } 1475 1476 /* Figure out our controlling tty, checking in order stderr, 1477 * stdin, and stdout. If check_pgrp is set, also check that 1478 * we belong to the foreground process group associated with 1479 * that tty. The value of shell_terminal is needed in order to call 1480 * tcsetpgrp(shell_terminal, ...); */ 1481 void controlling_tty(int check_pgrp) 1482 { 1483 pid_t curpgrp; 1484 1485 if ((curpgrp = tcgetpgrp(shell_terminal = 2)) < 0 1486 && (curpgrp = tcgetpgrp(shell_terminal = 0)) < 0 1487 && (curpgrp = tcgetpgrp(shell_terminal = 1)) < 0) 1488 goto shell_terminal_error; 1489 1490 if (check_pgrp && curpgrp != getpgid(0)) 1491 goto shell_terminal_error; 1492 1493 return; 1494 1495 shell_terminal_error: 1496 shell_terminal = -1; 1497 return; 1498 } 1499 #endif 1500 1501 /* run_pipe_real() starts all the jobs, but doesn't wait for anything 1502 * to finish. See checkjobs(). 1503 * 1504 * return code is normally -1, when the caller has to wait for children 1505 * to finish to determine the exit status of the pipe. If the pipe 1506 * is a simple builtin command, however, the action is done by the 1507 * time run_pipe_real returns, and the exit code is provided as the 1508 * return value. 1509 * 1510 * The input of the pipe is always stdin, the output is always 1511 * stdout. The outpipe[] mechanism in BusyBox-0.48 lash is bogus, 1512 * because it tries to avoid running the command substitution in 1513 * subshell, when that is in fact necessary. The subshell process 1514 * now has its stdout directed to the input of the appropriate pipe, 1515 * so this routine is noticeably simpler. 1516 */ 1517 static int run_pipe_real(struct pipe *pi) 1518 { 1519 int i; 1520 #ifndef __U_BOOT__ 1521 int nextin, nextout; 1522 int pipefds[2]; /* pipefds[0] is for reading */ 1523 struct child_prog *child; 1524 struct built_in_command *x; 1525 char *p; 1526 # if __GNUC__ 1527 /* Avoid longjmp clobbering */ 1528 (void) &i; 1529 (void) &nextin; 1530 (void) &nextout; 1531 (void) &child; 1532 # endif 1533 #else 1534 int nextin; 1535 int flag = do_repeat ? CMD_FLAG_REPEAT : 0; 1536 struct child_prog *child; 1537 char *p; 1538 # if __GNUC__ 1539 /* Avoid longjmp clobbering */ 1540 (void) &i; 1541 (void) &nextin; 1542 (void) &child; 1543 # endif 1544 #endif /* __U_BOOT__ */ 1545 1546 nextin = 0; 1547 #ifndef __U_BOOT__ 1548 pi->pgrp = -1; 1549 #endif 1550 1551 /* Check if this is a simple builtin (not part of a pipe). 1552 * Builtins within pipes have to fork anyway, and are handled in 1553 * pseudo_exec. "echo foo | read bar" doesn't work on bash, either. 1554 */ 1555 if (pi->num_progs == 1) child = & (pi->progs[0]); 1556 #ifndef __U_BOOT__ 1557 if (pi->num_progs == 1 && child->group && child->subshell == 0) { 1558 int squirrel[] = {-1, -1, -1}; 1559 int rcode; 1560 debug_printf("non-subshell grouping\n"); 1561 setup_redirects(child, squirrel); 1562 /* XXX could we merge code with following builtin case, 1563 * by creating a pseudo builtin that calls run_list_real? */ 1564 rcode = run_list_real(child->group); 1565 restore_redirects(squirrel); 1566 #else 1567 if (pi->num_progs == 1 && child->group) { 1568 int rcode; 1569 debug_printf("non-subshell grouping\n"); 1570 rcode = run_list_real(child->group); 1571 #endif 1572 return rcode; 1573 } else if (pi->num_progs == 1 && pi->progs[0].argv != NULL) { 1574 for (i=0; is_assignment(child->argv[i]); i++) { /* nothing */ } 1575 if (i!=0 && child->argv[i]==NULL) { 1576 /* assignments, but no command: set the local environment */ 1577 for (i=0; child->argv[i]!=NULL; i++) { 1578 1579 /* Ok, this case is tricky. We have to decide if this is a 1580 * local variable, or an already exported variable. If it is 1581 * already exported, we have to export the new value. If it is 1582 * not exported, we need only set this as a local variable. 1583 * This junk is all to decide whether or not to export this 1584 * variable. */ 1585 int export_me=0; 1586 char *name, *value; 1587 name = xstrdup(child->argv[i]); 1588 debug_printf("Local environment set: %s\n", name); 1589 value = strchr(name, '='); 1590 if (value) 1591 *value=0; 1592 #ifndef __U_BOOT__ 1593 if ( get_local_var(name)) { 1594 export_me=1; 1595 } 1596 #endif 1597 free(name); 1598 p = insert_var_value(child->argv[i]); 1599 set_local_var(p, export_me); 1600 if (p != child->argv[i]) free(p); 1601 } 1602 return EXIT_SUCCESS; /* don't worry about errors in set_local_var() yet */ 1603 } 1604 for (i = 0; is_assignment(child->argv[i]); i++) { 1605 p = insert_var_value(child->argv[i]); 1606 #ifndef __U_BOOT__ 1607 putenv(strdup(p)); 1608 #else 1609 set_local_var(p, 0); 1610 #endif 1611 if (p != child->argv[i]) { 1612 child->sp--; 1613 free(p); 1614 } 1615 } 1616 if (child->sp) { 1617 char * str = NULL; 1618 1619 str = make_string(child->argv + i, 1620 child->argv_nonnull + i); 1621 parse_string_outer(str, FLAG_EXIT_FROM_LOOP | FLAG_REPARSING); 1622 free(str); 1623 return last_return_code; 1624 } 1625 #ifndef __U_BOOT__ 1626 for (x = bltins; x->cmd; x++) { 1627 if (strcmp(child->argv[i], x->cmd) == 0 ) { 1628 int squirrel[] = {-1, -1, -1}; 1629 int rcode; 1630 if (x->function == builtin_exec && child->argv[i+1]==NULL) { 1631 debug_printf("magic exec\n"); 1632 setup_redirects(child,NULL); 1633 return EXIT_SUCCESS; 1634 } 1635 debug_printf("builtin inline %s\n", child->argv[0]); 1636 /* XXX setup_redirects acts on file descriptors, not FILEs. 1637 * This is perfect for work that comes after exec(). 1638 * Is it really safe for inline use? Experimentally, 1639 * things seem to work with glibc. */ 1640 setup_redirects(child, squirrel); 1641 1642 child->argv += i; /* XXX horrible hack */ 1643 rcode = x->function(child); 1644 /* XXX restore hack so free() can work right */ 1645 child->argv -= i; 1646 restore_redirects(squirrel); 1647 } 1648 return rcode; 1649 } 1650 #else 1651 /* check ";", because ,example , argv consist from 1652 * "help;flinfo" must not execute 1653 */ 1654 if (strchr(child->argv[i], ';')) { 1655 printf("Unknown command '%s' - try 'help' or use " 1656 "'run' command\n", child->argv[i]); 1657 return -1; 1658 } 1659 /* Process the command */ 1660 return cmd_process(flag, child->argc, child->argv, 1661 &flag_repeat, NULL); 1662 #endif 1663 } 1664 #ifndef __U_BOOT__ 1665 1666 for (i = 0; i < pi->num_progs; i++) { 1667 child = & (pi->progs[i]); 1668 1669 /* pipes are inserted between pairs of commands */ 1670 if ((i + 1) < pi->num_progs) { 1671 if (pipe(pipefds)<0) perror_msg_and_die("pipe"); 1672 nextout = pipefds[1]; 1673 } else { 1674 nextout=1; 1675 pipefds[0] = -1; 1676 } 1677 1678 /* XXX test for failed fork()? */ 1679 if (!(child->pid = fork())) { 1680 /* Set the handling for job control signals back to the default. */ 1681 signal(SIGINT, SIG_DFL); 1682 signal(SIGQUIT, SIG_DFL); 1683 signal(SIGTERM, SIG_DFL); 1684 signal(SIGTSTP, SIG_DFL); 1685 signal(SIGTTIN, SIG_DFL); 1686 signal(SIGTTOU, SIG_DFL); 1687 signal(SIGCHLD, SIG_DFL); 1688 1689 close_all(); 1690 1691 if (nextin != 0) { 1692 dup2(nextin, 0); 1693 close(nextin); 1694 } 1695 if (nextout != 1) { 1696 dup2(nextout, 1); 1697 close(nextout); 1698 } 1699 if (pipefds[0]!=-1) { 1700 close(pipefds[0]); /* opposite end of our output pipe */ 1701 } 1702 1703 /* Like bash, explicit redirects override pipes, 1704 * and the pipe fd is available for dup'ing. */ 1705 setup_redirects(child,NULL); 1706 1707 if (interactive && pi->followup!=PIPE_BG) { 1708 /* If we (the child) win the race, put ourselves in the process 1709 * group whose leader is the first process in this pipe. */ 1710 if (pi->pgrp < 0) { 1711 pi->pgrp = getpid(); 1712 } 1713 if (setpgid(0, pi->pgrp) == 0) { 1714 tcsetpgrp(2, pi->pgrp); 1715 } 1716 } 1717 1718 pseudo_exec(child); 1719 } 1720 1721 1722 /* put our child in the process group whose leader is the 1723 first process in this pipe */ 1724 if (pi->pgrp < 0) { 1725 pi->pgrp = child->pid; 1726 } 1727 /* Don't check for errors. The child may be dead already, 1728 * in which case setpgid returns error code EACCES. */ 1729 setpgid(child->pid, pi->pgrp); 1730 1731 if (nextin != 0) 1732 close(nextin); 1733 if (nextout != 1) 1734 close(nextout); 1735 1736 /* If there isn't another process, nextin is garbage 1737 but it doesn't matter */ 1738 nextin = pipefds[0]; 1739 } 1740 #endif 1741 return -1; 1742 } 1743 1744 static int run_list_real(struct pipe *pi) 1745 { 1746 char *save_name = NULL; 1747 char **list = NULL; 1748 char **save_list = NULL; 1749 struct pipe *rpipe; 1750 int flag_rep = 0; 1751 #ifndef __U_BOOT__ 1752 int save_num_progs; 1753 #endif 1754 int rcode=0, flag_skip=1; 1755 int flag_restore = 0; 1756 int if_code=0, next_if_code=0; /* need double-buffer to handle elif */ 1757 reserved_style rmode, skip_more_in_this_rmode=RES_XXXX; 1758 /* check syntax for "for" */ 1759 for (rpipe = pi; rpipe; rpipe = rpipe->next) { 1760 if ((rpipe->r_mode == RES_IN || 1761 rpipe->r_mode == RES_FOR) && 1762 (rpipe->next == NULL)) { 1763 syntax(); 1764 #ifdef __U_BOOT__ 1765 flag_repeat = 0; 1766 #endif 1767 return 1; 1768 } 1769 if ((rpipe->r_mode == RES_IN && 1770 (rpipe->next->r_mode == RES_IN && 1771 rpipe->next->progs->argv != NULL))|| 1772 (rpipe->r_mode == RES_FOR && 1773 rpipe->next->r_mode != RES_IN)) { 1774 syntax(); 1775 #ifdef __U_BOOT__ 1776 flag_repeat = 0; 1777 #endif 1778 return 1; 1779 } 1780 } 1781 for (; pi; pi = (flag_restore != 0) ? rpipe : pi->next) { 1782 if (pi->r_mode == RES_WHILE || pi->r_mode == RES_UNTIL || 1783 pi->r_mode == RES_FOR) { 1784 #ifdef __U_BOOT__ 1785 /* check Ctrl-C */ 1786 ctrlc(); 1787 if ((had_ctrlc())) { 1788 return 1; 1789 } 1790 #endif 1791 flag_restore = 0; 1792 if (!rpipe) { 1793 flag_rep = 0; 1794 rpipe = pi; 1795 } 1796 } 1797 rmode = pi->r_mode; 1798 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); 1799 if (rmode == skip_more_in_this_rmode && flag_skip) { 1800 if (pi->followup == PIPE_SEQ) flag_skip=0; 1801 continue; 1802 } 1803 flag_skip = 1; 1804 skip_more_in_this_rmode = RES_XXXX; 1805 if (rmode == RES_THEN || rmode == RES_ELSE) if_code = next_if_code; 1806 if (rmode == RES_THEN && if_code) continue; 1807 if (rmode == RES_ELSE && !if_code) continue; 1808 if (rmode == RES_ELIF && !if_code) break; 1809 if (rmode == RES_FOR && pi->num_progs) { 1810 if (!list) { 1811 /* if no variable values after "in" we skip "for" */ 1812 if (!pi->next->progs->argv) continue; 1813 /* create list of variable values */ 1814 list = make_list_in(pi->next->progs->argv, 1815 pi->progs->argv[0]); 1816 save_list = list; 1817 save_name = pi->progs->argv[0]; 1818 pi->progs->argv[0] = NULL; 1819 flag_rep = 1; 1820 } 1821 if (!(*list)) { 1822 free(pi->progs->argv[0]); 1823 free(save_list); 1824 list = NULL; 1825 flag_rep = 0; 1826 pi->progs->argv[0] = save_name; 1827 #ifndef __U_BOOT__ 1828 pi->progs->glob_result.gl_pathv[0] = 1829 pi->progs->argv[0]; 1830 #endif 1831 continue; 1832 } else { 1833 /* insert new value from list for variable */ 1834 if (pi->progs->argv[0]) 1835 free(pi->progs->argv[0]); 1836 pi->progs->argv[0] = *list++; 1837 #ifndef __U_BOOT__ 1838 pi->progs->glob_result.gl_pathv[0] = 1839 pi->progs->argv[0]; 1840 #endif 1841 } 1842 } 1843 if (rmode == RES_IN) continue; 1844 if (rmode == RES_DO) { 1845 if (!flag_rep) continue; 1846 } 1847 if ((rmode == RES_DONE)) { 1848 if (flag_rep) { 1849 flag_restore = 1; 1850 } else { 1851 rpipe = NULL; 1852 } 1853 } 1854 if (pi->num_progs == 0) continue; 1855 #ifndef __U_BOOT__ 1856 save_num_progs = pi->num_progs; /* save number of programs */ 1857 #endif 1858 rcode = run_pipe_real(pi); 1859 debug_printf("run_pipe_real returned %d\n",rcode); 1860 #ifndef __U_BOOT__ 1861 if (rcode!=-1) { 1862 /* We only ran a builtin: rcode was set by the return value 1863 * of run_pipe_real(), and we don't need to wait for anything. */ 1864 } else if (pi->followup==PIPE_BG) { 1865 /* XXX check bash's behavior with nontrivial pipes */ 1866 /* XXX compute jobid */ 1867 /* XXX what does bash do with attempts to background builtins? */ 1868 insert_bg_job(pi); 1869 rcode = EXIT_SUCCESS; 1870 } else { 1871 if (interactive) { 1872 /* move the new process group into the foreground */ 1873 if (tcsetpgrp(shell_terminal, pi->pgrp) && errno != ENOTTY) 1874 perror_msg("tcsetpgrp-3"); 1875 rcode = checkjobs(pi); 1876 /* move the shell to the foreground */ 1877 if (tcsetpgrp(shell_terminal, getpgid(0)) && errno != ENOTTY) 1878 perror_msg("tcsetpgrp-4"); 1879 } else { 1880 rcode = checkjobs(pi); 1881 } 1882 debug_printf("checkjobs returned %d\n",rcode); 1883 } 1884 last_return_code=rcode; 1885 #else 1886 if (rcode < -1) { 1887 last_return_code = -rcode - 2; 1888 return -2; /* exit */ 1889 } 1890 last_return_code=(rcode == 0) ? 0 : 1; 1891 #endif 1892 #ifndef __U_BOOT__ 1893 pi->num_progs = save_num_progs; /* restore number of programs */ 1894 #endif 1895 if ( rmode == RES_IF || rmode == RES_ELIF ) 1896 next_if_code=rcode; /* can be overwritten a number of times */ 1897 if (rmode == RES_WHILE) 1898 flag_rep = !last_return_code; 1899 if (rmode == RES_UNTIL) 1900 flag_rep = last_return_code; 1901 if ( (rcode==EXIT_SUCCESS && pi->followup==PIPE_OR) || 1902 (rcode!=EXIT_SUCCESS && pi->followup==PIPE_AND) ) 1903 skip_more_in_this_rmode=rmode; 1904 #ifndef __U_BOOT__ 1905 checkjobs(NULL); 1906 #endif 1907 } 1908 return rcode; 1909 } 1910 1911 /* broken, of course, but OK for testing */ 1912 static char *indenter(int i) 1913 { 1914 static char blanks[]=" "; 1915 return &blanks[sizeof(blanks)-i-1]; 1916 } 1917 1918 /* return code is the exit status of the pipe */ 1919 static int free_pipe(struct pipe *pi, int indent) 1920 { 1921 char **p; 1922 struct child_prog *child; 1923 #ifndef __U_BOOT__ 1924 struct redir_struct *r, *rnext; 1925 #endif 1926 int a, i, ret_code=0; 1927 char *ind = indenter(indent); 1928 1929 #ifndef __U_BOOT__ 1930 if (pi->stopped_progs > 0) 1931 return ret_code; 1932 final_printf("%s run pipe: (pid %d)\n",ind,getpid()); 1933 #endif 1934 for (i=0; i<pi->num_progs; i++) { 1935 child = &pi->progs[i]; 1936 final_printf("%s command %d:\n",ind,i); 1937 if (child->argv) { 1938 for (a=0,p=child->argv; *p; a++,p++) { 1939 final_printf("%s argv[%d] = %s\n",ind,a,*p); 1940 } 1941 #ifndef __U_BOOT__ 1942 globfree(&child->glob_result); 1943 #else 1944 for (a = 0; a < child->argc; a++) { 1945 free(child->argv[a]); 1946 } 1947 free(child->argv); 1948 free(child->argv_nonnull); 1949 child->argc = 0; 1950 #endif 1951 child->argv=NULL; 1952 } else if (child->group) { 1953 #ifndef __U_BOOT__ 1954 final_printf("%s begin group (subshell:%d)\n",ind, child->subshell); 1955 #endif 1956 ret_code = free_pipe_list(child->group,indent+3); 1957 final_printf("%s end group\n",ind); 1958 } else { 1959 final_printf("%s (nil)\n",ind); 1960 } 1961 #ifndef __U_BOOT__ 1962 for (r=child->redirects; r; r=rnext) { 1963 final_printf("%s redirect %d%s", ind, r->fd, redir_table[r->type].descrip); 1964 if (r->dup == -1) { 1965 /* guard against the case >$FOO, where foo is unset or blank */ 1966 if (r->word.gl_pathv) { 1967 final_printf(" %s\n", *r->word.gl_pathv); 1968 globfree(&r->word); 1969 } 1970 } else { 1971 final_printf("&%d\n", r->dup); 1972 } 1973 rnext=r->next; 1974 free(r); 1975 } 1976 child->redirects=NULL; 1977 #endif 1978 } 1979 free(pi->progs); /* children are an array, they get freed all at once */ 1980 pi->progs=NULL; 1981 return ret_code; 1982 } 1983 1984 static int free_pipe_list(struct pipe *head, int indent) 1985 { 1986 int rcode=0; /* if list has no members */ 1987 struct pipe *pi, *next; 1988 char *ind = indenter(indent); 1989 for (pi=head; pi; pi=next) { 1990 final_printf("%s pipe reserved mode %d\n", ind, pi->r_mode); 1991 rcode = free_pipe(pi, indent); 1992 final_printf("%s pipe followup code %d\n", ind, pi->followup); 1993 next=pi->next; 1994 pi->next=NULL; 1995 free(pi); 1996 } 1997 return rcode; 1998 } 1999 2000 /* Select which version we will use */ 2001 static int run_list(struct pipe *pi) 2002 { 2003 int rcode=0; 2004 #ifndef __U_BOOT__ 2005 if (fake_mode==0) { 2006 #endif 2007 rcode = run_list_real(pi); 2008 #ifndef __U_BOOT__ 2009 } 2010 #endif 2011 /* free_pipe_list has the side effect of clearing memory 2012 * In the long run that function can be merged with run_list_real, 2013 * but doing that now would hobble the debugging effort. */ 2014 free_pipe_list(pi,0); 2015 return rcode; 2016 } 2017 2018 /* The API for glob is arguably broken. This routine pushes a non-matching 2019 * string into the output structure, removing non-backslashed backslashes. 2020 * If someone can prove me wrong, by performing this function within the 2021 * original glob(3) api, feel free to rewrite this routine into oblivion. 2022 * Return code (0 vs. GLOB_NOSPACE) matches glob(3). 2023 * XXX broken if the last character is '\\', check that before calling. 2024 */ 2025 #ifndef __U_BOOT__ 2026 static int globhack(const char *src, int flags, glob_t *pglob) 2027 { 2028 int cnt=0, pathc; 2029 const char *s; 2030 char *dest; 2031 for (cnt=1, s=src; s && *s; s++) { 2032 if (*s == '\\') s++; 2033 cnt++; 2034 } 2035 dest = malloc(cnt); 2036 if (!dest) return GLOB_NOSPACE; 2037 if (!(flags & GLOB_APPEND)) { 2038 pglob->gl_pathv=NULL; 2039 pglob->gl_pathc=0; 2040 pglob->gl_offs=0; 2041 pglob->gl_offs=0; 2042 } 2043 pathc = ++pglob->gl_pathc; 2044 pglob->gl_pathv = realloc(pglob->gl_pathv, (pathc+1)*sizeof(*pglob->gl_pathv)); 2045 if (pglob->gl_pathv == NULL) return GLOB_NOSPACE; 2046 pglob->gl_pathv[pathc-1]=dest; 2047 pglob->gl_pathv[pathc]=NULL; 2048 for (s=src; s && *s; s++, dest++) { 2049 if (*s == '\\') s++; 2050 *dest = *s; 2051 } 2052 *dest='\0'; 2053 return 0; 2054 } 2055 2056 /* XXX broken if the last character is '\\', check that before calling */ 2057 static int glob_needed(const char *s) 2058 { 2059 for (; *s; s++) { 2060 if (*s == '\\') s++; 2061 if (strchr("*[?",*s)) return 1; 2062 } 2063 return 0; 2064 } 2065 2066 #if 0 2067 static void globprint(glob_t *pglob) 2068 { 2069 int i; 2070 debug_printf("glob_t at %p:\n", pglob); 2071 debug_printf(" gl_pathc=%d gl_pathv=%p gl_offs=%d gl_flags=%d\n", 2072 pglob->gl_pathc, pglob->gl_pathv, pglob->gl_offs, pglob->gl_flags); 2073 for (i=0; i<pglob->gl_pathc; i++) 2074 debug_printf("pglob->gl_pathv[%d] = %p = %s\n", i, 2075 pglob->gl_pathv[i], pglob->gl_pathv[i]); 2076 } 2077 #endif 2078 2079 static int xglob(o_string *dest, int flags, glob_t *pglob) 2080 { 2081 int gr; 2082 2083 /* short-circuit for null word */ 2084 /* we can code this better when the debug_printf's are gone */ 2085 if (dest->length == 0) { 2086 if (dest->nonnull) { 2087 /* bash man page calls this an "explicit" null */ 2088 gr = globhack(dest->data, flags, pglob); 2089 debug_printf("globhack returned %d\n",gr); 2090 } else { 2091 return 0; 2092 } 2093 } else if (glob_needed(dest->data)) { 2094 gr = glob(dest->data, flags, NULL, pglob); 2095 debug_printf("glob returned %d\n",gr); 2096 if (gr == GLOB_NOMATCH) { 2097 /* quote removal, or more accurately, backslash removal */ 2098 gr = globhack(dest->data, flags, pglob); 2099 debug_printf("globhack returned %d\n",gr); 2100 } 2101 } else { 2102 gr = globhack(dest->data, flags, pglob); 2103 debug_printf("globhack returned %d\n",gr); 2104 } 2105 if (gr == GLOB_NOSPACE) 2106 error_msg_and_die("out of memory during glob"); 2107 if (gr != 0) { /* GLOB_ABORTED ? */ 2108 error_msg("glob(3) error %d",gr); 2109 } 2110 /* globprint(glob_target); */ 2111 return gr; 2112 } 2113 #endif 2114 2115 #ifdef __U_BOOT__ 2116 static char *get_dollar_var(char ch); 2117 #endif 2118 2119 /* This is used to get/check local shell variables */ 2120 char *get_local_var(const char *s) 2121 { 2122 struct variables *cur; 2123 2124 if (!s) 2125 return NULL; 2126 2127 #ifdef __U_BOOT__ 2128 if (*s == '$') 2129 return get_dollar_var(s[1]); 2130 #endif 2131 2132 for (cur = top_vars; cur; cur=cur->next) 2133 if(strcmp(cur->name, s)==0) 2134 return cur->value; 2135 return NULL; 2136 } 2137 2138 /* This is used to set local shell variables 2139 flg_export==0 if only local (not exporting) variable 2140 flg_export==1 if "new" exporting environ 2141 flg_export>1 if current startup environ (not call putenv()) */ 2142 int set_local_var(const char *s, int flg_export) 2143 { 2144 char *name, *value; 2145 int result=0; 2146 struct variables *cur; 2147 2148 #ifdef __U_BOOT__ 2149 /* might be possible! */ 2150 if (!isalpha(*s)) 2151 return -1; 2152 #endif 2153 2154 name=strdup(s); 2155 2156 #ifdef __U_BOOT__ 2157 if (getenv(name) != NULL) { 2158 printf ("ERROR: " 2159 "There is a global environment variable with the same name.\n"); 2160 free(name); 2161 return -1; 2162 } 2163 #endif 2164 /* Assume when we enter this function that we are already in 2165 * NAME=VALUE format. So the first order of business is to 2166 * split 's' on the '=' into 'name' and 'value' */ 2167 value = strchr(name, '='); 2168 if (value == NULL && ++value == NULL) { 2169 free(name); 2170 return -1; 2171 } 2172 *value++ = 0; 2173 2174 for(cur = top_vars; cur; cur = cur->next) { 2175 if(strcmp(cur->name, name)==0) 2176 break; 2177 } 2178 2179 if(cur) { 2180 if(strcmp(cur->value, value)==0) { 2181 if(flg_export>0 && cur->flg_export==0) 2182 cur->flg_export=flg_export; 2183 else 2184 result++; 2185 } else { 2186 if(cur->flg_read_only) { 2187 error_msg("%s: readonly variable", name); 2188 result = -1; 2189 } else { 2190 if(flg_export>0 || cur->flg_export>1) 2191 cur->flg_export=1; 2192 free(cur->value); 2193 2194 cur->value = strdup(value); 2195 } 2196 } 2197 } else { 2198 cur = malloc(sizeof(struct variables)); 2199 if(!cur) { 2200 result = -1; 2201 } else { 2202 cur->name = strdup(name); 2203 if (cur->name == NULL) { 2204 free(cur); 2205 result = -1; 2206 } else { 2207 struct variables *bottom = top_vars; 2208 cur->value = strdup(value); 2209 cur->next = NULL; 2210 cur->flg_export = flg_export; 2211 cur->flg_read_only = 0; 2212 while(bottom->next) bottom=bottom->next; 2213 bottom->next = cur; 2214 } 2215 } 2216 } 2217 2218 #ifndef __U_BOOT__ 2219 if(result==0 && cur->flg_export==1) { 2220 *(value-1) = '='; 2221 result = putenv(name); 2222 } else { 2223 #endif 2224 free(name); 2225 #ifndef __U_BOOT__ 2226 if(result>0) /* equivalent to previous set */ 2227 result = 0; 2228 } 2229 #endif 2230 return result; 2231 } 2232 2233 void unset_local_var(const char *name) 2234 { 2235 struct variables *cur; 2236 2237 if (name) { 2238 for (cur = top_vars; cur; cur=cur->next) { 2239 if(strcmp(cur->name, name)==0) 2240 break; 2241 } 2242 if (cur != NULL) { 2243 struct variables *next = top_vars; 2244 if(cur->flg_read_only) { 2245 error_msg("%s: readonly variable", name); 2246 return; 2247 } else { 2248 #ifndef __U_BOOT__ 2249 if(cur->flg_export) 2250 unsetenv(cur->name); 2251 #endif 2252 free(cur->name); 2253 free(cur->value); 2254 while (next->next != cur) 2255 next = next->next; 2256 next->next = cur->next; 2257 } 2258 free(cur); 2259 } 2260 } 2261 } 2262 2263 static int is_assignment(const char *s) 2264 { 2265 if (s == NULL) 2266 return 0; 2267 2268 if (!isalpha(*s)) return 0; 2269 ++s; 2270 while(isalnum(*s) || *s=='_') ++s; 2271 return *s=='='; 2272 } 2273 2274 #ifndef __U_BOOT__ 2275 /* the src parameter allows us to peek forward to a possible &n syntax 2276 * for file descriptor duplication, e.g., "2>&1". 2277 * Return code is 0 normally, 1 if a syntax error is detected in src. 2278 * Resource errors (in xmalloc) cause the process to exit */ 2279 static int setup_redirect(struct p_context *ctx, int fd, redir_type style, 2280 struct in_str *input) 2281 { 2282 struct child_prog *child=ctx->child; 2283 struct redir_struct *redir = child->redirects; 2284 struct redir_struct *last_redir=NULL; 2285 2286 /* Create a new redir_struct and drop it onto the end of the linked list */ 2287 while(redir) { 2288 last_redir=redir; 2289 redir=redir->next; 2290 } 2291 redir = xmalloc(sizeof(struct redir_struct)); 2292 redir->next=NULL; 2293 redir->word.gl_pathv=NULL; 2294 if (last_redir) { 2295 last_redir->next=redir; 2296 } else { 2297 child->redirects=redir; 2298 } 2299 2300 redir->type=style; 2301 redir->fd= (fd==-1) ? redir_table[style].default_fd : fd ; 2302 2303 debug_printf("Redirect type %d%s\n", redir->fd, redir_table[style].descrip); 2304 2305 /* Check for a '2>&1' type redirect */ 2306 redir->dup = redirect_dup_num(input); 2307 if (redir->dup == -2) return 1; /* syntax error */ 2308 if (redir->dup != -1) { 2309 /* Erik had a check here that the file descriptor in question 2310 * is legit; I postpone that to "run time" 2311 * A "-" representation of "close me" shows up as a -3 here */ 2312 debug_printf("Duplicating redirect '%d>&%d'\n", redir->fd, redir->dup); 2313 } else { 2314 /* We do _not_ try to open the file that src points to, 2315 * since we need to return and let src be expanded first. 2316 * Set ctx->pending_redirect, so we know what to do at the 2317 * end of the next parsed word. 2318 */ 2319 ctx->pending_redirect = redir; 2320 } 2321 return 0; 2322 } 2323 #endif 2324 2325 static struct pipe *new_pipe(void) 2326 { 2327 struct pipe *pi; 2328 pi = xmalloc(sizeof(struct pipe)); 2329 pi->num_progs = 0; 2330 pi->progs = NULL; 2331 pi->next = NULL; 2332 pi->followup = 0; /* invalid */ 2333 pi->r_mode = RES_NONE; 2334 return pi; 2335 } 2336 2337 static void initialize_context(struct p_context *ctx) 2338 { 2339 ctx->pipe=NULL; 2340 #ifndef __U_BOOT__ 2341 ctx->pending_redirect=NULL; 2342 #endif 2343 ctx->child=NULL; 2344 ctx->list_head=new_pipe(); 2345 ctx->pipe=ctx->list_head; 2346 ctx->w=RES_NONE; 2347 ctx->stack=NULL; 2348 #ifdef __U_BOOT__ 2349 ctx->old_flag=0; 2350 #endif 2351 done_command(ctx); /* creates the memory for working child */ 2352 } 2353 2354 /* normal return is 0 2355 * if a reserved word is found, and processed, return 1 2356 * should handle if, then, elif, else, fi, for, while, until, do, done. 2357 * case, function, and select are obnoxious, save those for later. 2358 */ 2359 struct reserved_combo { 2360 char *literal; 2361 int code; 2362 long flag; 2363 }; 2364 /* Mostly a list of accepted follow-up reserved words. 2365 * FLAG_END means we are done with the sequence, and are ready 2366 * to turn the compound list into a command. 2367 * FLAG_START means the word must start a new compound list. 2368 */ 2369 static struct reserved_combo reserved_list[] = { 2370 { "if", RES_IF, FLAG_THEN | FLAG_START }, 2371 { "then", RES_THEN, FLAG_ELIF | FLAG_ELSE | FLAG_FI }, 2372 { "elif", RES_ELIF, FLAG_THEN }, 2373 { "else", RES_ELSE, FLAG_FI }, 2374 { "fi", RES_FI, FLAG_END }, 2375 { "for", RES_FOR, FLAG_IN | FLAG_START }, 2376 { "while", RES_WHILE, FLAG_DO | FLAG_START }, 2377 { "until", RES_UNTIL, FLAG_DO | FLAG_START }, 2378 { "in", RES_IN, FLAG_DO }, 2379 { "do", RES_DO, FLAG_DONE }, 2380 { "done", RES_DONE, FLAG_END } 2381 }; 2382 #define NRES (sizeof(reserved_list)/sizeof(struct reserved_combo)) 2383 2384 static int reserved_word(o_string *dest, struct p_context *ctx) 2385 { 2386 struct reserved_combo *r; 2387 for (r=reserved_list; 2388 r<reserved_list+NRES; r++) { 2389 if (strcmp(dest->data, r->literal) == 0) { 2390 debug_printf("found reserved word %s, code %d\n",r->literal,r->code); 2391 if (r->flag & FLAG_START) { 2392 struct p_context *new = xmalloc(sizeof(struct p_context)); 2393 debug_printf("push stack\n"); 2394 if (ctx->w == RES_IN || ctx->w == RES_FOR) { 2395 syntax(); 2396 free(new); 2397 ctx->w = RES_SNTX; 2398 b_reset(dest); 2399 return 1; 2400 } 2401 *new = *ctx; /* physical copy */ 2402 initialize_context(ctx); 2403 ctx->stack=new; 2404 } else if ( ctx->w == RES_NONE || ! (ctx->old_flag & (1<<r->code))) { 2405 syntax(); 2406 ctx->w = RES_SNTX; 2407 b_reset(dest); 2408 return 1; 2409 } 2410 ctx->w=r->code; 2411 ctx->old_flag = r->flag; 2412 if (ctx->old_flag & FLAG_END) { 2413 struct p_context *old; 2414 debug_printf("pop stack\n"); 2415 done_pipe(ctx,PIPE_SEQ); 2416 old = ctx->stack; 2417 old->child->group = ctx->list_head; 2418 #ifndef __U_BOOT__ 2419 old->child->subshell = 0; 2420 #endif 2421 *ctx = *old; /* physical copy */ 2422 free(old); 2423 } 2424 b_reset (dest); 2425 return 1; 2426 } 2427 } 2428 return 0; 2429 } 2430 2431 /* normal return is 0. 2432 * Syntax or xglob errors return 1. */ 2433 static int done_word(o_string *dest, struct p_context *ctx) 2434 { 2435 struct child_prog *child=ctx->child; 2436 #ifndef __U_BOOT__ 2437 glob_t *glob_target; 2438 int gr, flags = 0; 2439 #else 2440 char *str, *s; 2441 int argc, cnt; 2442 #endif 2443 2444 debug_printf("done_word: %s %p\n", dest->data, child); 2445 if (dest->length == 0 && !dest->nonnull) { 2446 debug_printf(" true null, ignored\n"); 2447 return 0; 2448 } 2449 #ifndef __U_BOOT__ 2450 if (ctx->pending_redirect) { 2451 glob_target = &ctx->pending_redirect->word; 2452 } else { 2453 #endif 2454 if (child->group) { 2455 syntax(); 2456 return 1; /* syntax error, groups and arglists don't mix */ 2457 } 2458 if (!child->argv && (ctx->type & FLAG_PARSE_SEMICOLON)) { 2459 debug_printf("checking %s for reserved-ness\n",dest->data); 2460 if (reserved_word(dest,ctx)) return ctx->w==RES_SNTX; 2461 } 2462 #ifndef __U_BOOT__ 2463 glob_target = &child->glob_result; 2464 if (child->argv) flags |= GLOB_APPEND; 2465 #else 2466 for (cnt = 1, s = dest->data; s && *s; s++) { 2467 if (*s == '\\') s++; 2468 cnt++; 2469 } 2470 str = malloc(cnt); 2471 if (!str) return 1; 2472 if ( child->argv == NULL) { 2473 child->argc=0; 2474 } 2475 argc = ++child->argc; 2476 child->argv = realloc(child->argv, (argc+1)*sizeof(*child->argv)); 2477 if (child->argv == NULL) return 1; 2478 child->argv_nonnull = realloc(child->argv_nonnull, 2479 (argc+1)*sizeof(*child->argv_nonnull)); 2480 if (child->argv_nonnull == NULL) 2481 return 1; 2482 child->argv[argc-1]=str; 2483 child->argv_nonnull[argc-1] = dest->nonnull; 2484 child->argv[argc]=NULL; 2485 child->argv_nonnull[argc] = 0; 2486 for (s = dest->data; s && *s; s++,str++) { 2487 if (*s == '\\') s++; 2488 *str = *s; 2489 } 2490 *str = '\0'; 2491 #endif 2492 #ifndef __U_BOOT__ 2493 } 2494 gr = xglob(dest, flags, glob_target); 2495 if (gr != 0) return 1; 2496 #endif 2497 2498 b_reset(dest); 2499 #ifndef __U_BOOT__ 2500 if (ctx->pending_redirect) { 2501 ctx->pending_redirect=NULL; 2502 if (glob_target->gl_pathc != 1) { 2503 error_msg("ambiguous redirect"); 2504 return 1; 2505 } 2506 } else { 2507 child->argv = glob_target->gl_pathv; 2508 } 2509 #endif 2510 if (ctx->w == RES_FOR) { 2511 done_word(dest,ctx); 2512 done_pipe(ctx,PIPE_SEQ); 2513 } 2514 return 0; 2515 } 2516 2517 /* The only possible error here is out of memory, in which case 2518 * xmalloc exits. */ 2519 static int done_command(struct p_context *ctx) 2520 { 2521 /* The child is really already in the pipe structure, so 2522 * advance the pipe counter and make a new, null child. 2523 * Only real trickiness here is that the uncommitted 2524 * child structure, to which ctx->child points, is not 2525 * counted in pi->num_progs. */ 2526 struct pipe *pi=ctx->pipe; 2527 struct child_prog *prog=ctx->child; 2528 2529 if (prog && prog->group == NULL 2530 && prog->argv == NULL 2531 #ifndef __U_BOOT__ 2532 && prog->redirects == NULL) { 2533 #else 2534 ) { 2535 #endif 2536 debug_printf("done_command: skipping null command\n"); 2537 return 0; 2538 } else if (prog) { 2539 pi->num_progs++; 2540 debug_printf("done_command: num_progs incremented to %d\n",pi->num_progs); 2541 } else { 2542 debug_printf("done_command: initializing\n"); 2543 } 2544 pi->progs = xrealloc(pi->progs, sizeof(*pi->progs) * (pi->num_progs+1)); 2545 2546 prog = pi->progs + pi->num_progs; 2547 #ifndef __U_BOOT__ 2548 prog->redirects = NULL; 2549 #endif 2550 prog->argv = NULL; 2551 prog->argv_nonnull = NULL; 2552 #ifndef __U_BOOT__ 2553 prog->is_stopped = 0; 2554 #endif 2555 prog->group = NULL; 2556 #ifndef __U_BOOT__ 2557 prog->glob_result.gl_pathv = NULL; 2558 prog->family = pi; 2559 #endif 2560 prog->sp = 0; 2561 ctx->child = prog; 2562 prog->type = ctx->type; 2563 2564 /* but ctx->pipe and ctx->list_head remain unchanged */ 2565 return 0; 2566 } 2567 2568 static int done_pipe(struct p_context *ctx, pipe_style type) 2569 { 2570 struct pipe *new_p; 2571 done_command(ctx); /* implicit closure of previous command */ 2572 debug_printf("done_pipe, type %d\n", type); 2573 ctx->pipe->followup = type; 2574 ctx->pipe->r_mode = ctx->w; 2575 new_p=new_pipe(); 2576 ctx->pipe->next = new_p; 2577 ctx->pipe = new_p; 2578 ctx->child = NULL; 2579 done_command(ctx); /* set up new pipe to accept commands */ 2580 return 0; 2581 } 2582 2583 #ifndef __U_BOOT__ 2584 /* peek ahead in the in_str to find out if we have a "&n" construct, 2585 * as in "2>&1", that represents duplicating a file descriptor. 2586 * returns either -2 (syntax error), -1 (no &), or the number found. 2587 */ 2588 static int redirect_dup_num(struct in_str *input) 2589 { 2590 int ch, d=0, ok=0; 2591 ch = b_peek(input); 2592 if (ch != '&') return -1; 2593 2594 b_getch(input); /* get the & */ 2595 ch=b_peek(input); 2596 if (ch == '-') { 2597 b_getch(input); 2598 return -3; /* "-" represents "close me" */ 2599 } 2600 while (isdigit(ch)) { 2601 d = d*10+(ch-'0'); 2602 ok=1; 2603 b_getch(input); 2604 ch = b_peek(input); 2605 } 2606 if (ok) return d; 2607 2608 error_msg("ambiguous redirect"); 2609 return -2; 2610 } 2611 2612 /* If a redirect is immediately preceded by a number, that number is 2613 * supposed to tell which file descriptor to redirect. This routine 2614 * looks for such preceding numbers. In an ideal world this routine 2615 * needs to handle all the following classes of redirects... 2616 * echo 2>foo # redirects fd 2 to file "foo", nothing passed to echo 2617 * echo 49>foo # redirects fd 49 to file "foo", nothing passed to echo 2618 * echo -2>foo # redirects fd 1 to file "foo", "-2" passed to echo 2619 * echo 49x>foo # redirects fd 1 to file "foo", "49x" passed to echo 2620 * A -1 output from this program means no valid number was found, so the 2621 * caller should use the appropriate default for this redirection. 2622 */ 2623 static int redirect_opt_num(o_string *o) 2624 { 2625 int num; 2626 2627 if (o->length==0) return -1; 2628 for(num=0; num<o->length; num++) { 2629 if (!isdigit(*(o->data+num))) { 2630 return -1; 2631 } 2632 } 2633 /* reuse num (and save an int) */ 2634 num=atoi(o->data); 2635 b_reset(o); 2636 return num; 2637 } 2638 2639 FILE *generate_stream_from_list(struct pipe *head) 2640 { 2641 FILE *pf; 2642 #if 1 2643 int pid, channel[2]; 2644 if (pipe(channel)<0) perror_msg_and_die("pipe"); 2645 pid=fork(); 2646 if (pid<0) { 2647 perror_msg_and_die("fork"); 2648 } else if (pid==0) { 2649 close(channel[0]); 2650 if (channel[1] != 1) { 2651 dup2(channel[1],1); 2652 close(channel[1]); 2653 } 2654 #if 0 2655 #define SURROGATE "surrogate response" 2656 write(1,SURROGATE,sizeof(SURROGATE)); 2657 _exit(run_list(head)); 2658 #else 2659 _exit(run_list_real(head)); /* leaks memory */ 2660 #endif 2661 } 2662 debug_printf("forked child %d\n",pid); 2663 close(channel[1]); 2664 pf = fdopen(channel[0],"r"); 2665 debug_printf("pipe on FILE *%p\n",pf); 2666 #else 2667 free_pipe_list(head,0); 2668 pf=popen("echo surrogate response","r"); 2669 debug_printf("started fake pipe on FILE *%p\n",pf); 2670 #endif 2671 return pf; 2672 } 2673 2674 /* this version hacked for testing purposes */ 2675 /* return code is exit status of the process that is run. */ 2676 static int process_command_subs(o_string *dest, struct p_context *ctx, struct in_str *input, int subst_end) 2677 { 2678 int retcode; 2679 o_string result=NULL_O_STRING; 2680 struct p_context inner; 2681 FILE *p; 2682 struct in_str pipe_str; 2683 initialize_context(&inner); 2684 2685 /* recursion to generate command */ 2686 retcode = parse_stream(&result, &inner, input, subst_end); 2687 if (retcode != 0) return retcode; /* syntax error or EOF */ 2688 done_word(&result, &inner); 2689 done_pipe(&inner, PIPE_SEQ); 2690 b_free(&result); 2691 2692 p=generate_stream_from_list(inner.list_head); 2693 if (p==NULL) return 1; 2694 mark_open(fileno(p)); 2695 setup_file_in_str(&pipe_str, p); 2696 2697 /* now send results of command back into original context */ 2698 retcode = parse_stream(dest, ctx, &pipe_str, '\0'); 2699 /* XXX In case of a syntax error, should we try to kill the child? 2700 * That would be tough to do right, so just read until EOF. */ 2701 if (retcode == 1) { 2702 while (b_getch(&pipe_str)!=EOF) { /* discard */ }; 2703 } 2704 2705 debug_printf("done reading from pipe, pclose()ing\n"); 2706 /* This is the step that wait()s for the child. Should be pretty 2707 * safe, since we just read an EOF from its stdout. We could try 2708 * to better, by using wait(), and keeping track of background jobs 2709 * at the same time. That would be a lot of work, and contrary 2710 * to the KISS philosophy of this program. */ 2711 mark_closed(fileno(p)); 2712 retcode=pclose(p); 2713 free_pipe_list(inner.list_head,0); 2714 debug_printf("pclosed, retcode=%d\n",retcode); 2715 /* XXX this process fails to trim a single trailing newline */ 2716 return retcode; 2717 } 2718 2719 static int parse_group(o_string *dest, struct p_context *ctx, 2720 struct in_str *input, int ch) 2721 { 2722 int rcode, endch=0; 2723 struct p_context sub; 2724 struct child_prog *child = ctx->child; 2725 if (child->argv) { 2726 syntax(); 2727 return 1; /* syntax error, groups and arglists don't mix */ 2728 } 2729 initialize_context(&sub); 2730 switch(ch) { 2731 case '(': endch=')'; child->subshell=1; break; 2732 case '{': endch='}'; break; 2733 default: syntax(); /* really logic error */ 2734 } 2735 rcode=parse_stream(dest,&sub,input,endch); 2736 done_word(dest,&sub); /* finish off the final word in the subcontext */ 2737 done_pipe(&sub, PIPE_SEQ); /* and the final command there, too */ 2738 child->group = sub.list_head; 2739 return rcode; 2740 /* child remains "open", available for possible redirects */ 2741 } 2742 #endif 2743 2744 /* basically useful version until someone wants to get fancier, 2745 * see the bash man page under "Parameter Expansion" */ 2746 static char *lookup_param(char *src) 2747 { 2748 char *p; 2749 char *sep; 2750 char *default_val = NULL; 2751 int assign = 0; 2752 int expand_empty = 0; 2753 2754 if (!src) 2755 return NULL; 2756 2757 sep = strchr(src, ':'); 2758 2759 if (sep) { 2760 *sep = '\0'; 2761 if (*(sep + 1) == '-') 2762 default_val = sep+2; 2763 if (*(sep + 1) == '=') { 2764 default_val = sep+2; 2765 assign = 1; 2766 } 2767 if (*(sep + 1) == '+') { 2768 default_val = sep+2; 2769 expand_empty = 1; 2770 } 2771 } 2772 2773 p = getenv(src); 2774 if (!p) 2775 p = get_local_var(src); 2776 2777 if (!p || strlen(p) == 0) { 2778 p = default_val; 2779 if (assign) { 2780 char *var = malloc(strlen(src)+strlen(default_val)+2); 2781 if (var) { 2782 sprintf(var, "%s=%s", src, default_val); 2783 set_local_var(var, 0); 2784 } 2785 free(var); 2786 } 2787 } else if (expand_empty) { 2788 p += strlen(p); 2789 } 2790 2791 if (sep) 2792 *sep = ':'; 2793 2794 return p; 2795 } 2796 2797 #ifdef __U_BOOT__ 2798 static char *get_dollar_var(char ch) 2799 { 2800 static char buf[40]; 2801 2802 buf[0] = '\0'; 2803 switch (ch) { 2804 case '?': 2805 sprintf(buf, "%u", (unsigned int)last_return_code); 2806 break; 2807 default: 2808 return NULL; 2809 } 2810 return buf; 2811 } 2812 #endif 2813 2814 /* return code: 0 for OK, 1 for syntax error */ 2815 static int handle_dollar(o_string *dest, struct p_context *ctx, struct in_str *input) 2816 { 2817 #ifndef __U_BOOT__ 2818 int i, advance=0; 2819 #else 2820 int advance=0; 2821 #endif 2822 #ifndef __U_BOOT__ 2823 char sep[]=" "; 2824 #endif 2825 int ch = input->peek(input); /* first character after the $ */ 2826 debug_printf("handle_dollar: ch=%c\n",ch); 2827 if (isalpha(ch)) { 2828 b_addchr(dest, SPECIAL_VAR_SYMBOL); 2829 ctx->child->sp++; 2830 while(ch=b_peek(input),isalnum(ch) || ch=='_') { 2831 b_getch(input); 2832 b_addchr(dest,ch); 2833 } 2834 b_addchr(dest, SPECIAL_VAR_SYMBOL); 2835 #ifndef __U_BOOT__ 2836 } else if (isdigit(ch)) { 2837 i = ch-'0'; /* XXX is $0 special? */ 2838 if (i<global_argc) { 2839 parse_string(dest, ctx, global_argv[i]); /* recursion */ 2840 } 2841 advance = 1; 2842 #endif 2843 } else switch (ch) { 2844 #ifndef __U_BOOT__ 2845 case '$': 2846 b_adduint(dest,getpid()); 2847 advance = 1; 2848 break; 2849 case '!': 2850 if (last_bg_pid > 0) b_adduint(dest, last_bg_pid); 2851 advance = 1; 2852 break; 2853 #endif 2854 case '?': 2855 #ifndef __U_BOOT__ 2856 b_adduint(dest,last_return_code); 2857 #else 2858 ctx->child->sp++; 2859 b_addchr(dest, SPECIAL_VAR_SYMBOL); 2860 b_addchr(dest, '$'); 2861 b_addchr(dest, '?'); 2862 b_addchr(dest, SPECIAL_VAR_SYMBOL); 2863 #endif 2864 advance = 1; 2865 break; 2866 #ifndef __U_BOOT__ 2867 case '#': 2868 b_adduint(dest,global_argc ? global_argc-1 : 0); 2869 advance = 1; 2870 break; 2871 #endif 2872 case '{': 2873 b_addchr(dest, SPECIAL_VAR_SYMBOL); 2874 ctx->child->sp++; 2875 b_getch(input); 2876 /* XXX maybe someone will try to escape the '}' */ 2877 while(ch=b_getch(input),ch!=EOF && ch!='}') { 2878 b_addchr(dest,ch); 2879 } 2880 if (ch != '}') { 2881 syntax(); 2882 return 1; 2883 } 2884 b_addchr(dest, SPECIAL_VAR_SYMBOL); 2885 break; 2886 #ifndef __U_BOOT__ 2887 case '(': 2888 b_getch(input); 2889 process_command_subs(dest, ctx, input, ')'); 2890 break; 2891 case '*': 2892 sep[0]=ifs[0]; 2893 for (i=1; i<global_argc; i++) { 2894 parse_string(dest, ctx, global_argv[i]); 2895 if (i+1 < global_argc) parse_string(dest, ctx, sep); 2896 } 2897 break; 2898 case '@': 2899 case '-': 2900 case '_': 2901 /* still unhandled, but should be eventually */ 2902 error_msg("unhandled syntax: $%c",ch); 2903 return 1; 2904 break; 2905 #endif 2906 default: 2907 b_addqchr(dest,'$',dest->quote); 2908 } 2909 /* Eat the character if the flag was set. If the compiler 2910 * is smart enough, we could substitute "b_getch(input);" 2911 * for all the "advance = 1;" above, and also end up with 2912 * a nice size-optimized program. Hah! That'll be the day. 2913 */ 2914 if (advance) b_getch(input); 2915 return 0; 2916 } 2917 2918 #ifndef __U_BOOT__ 2919 int parse_string(o_string *dest, struct p_context *ctx, const char *src) 2920 { 2921 struct in_str foo; 2922 setup_string_in_str(&foo, src); 2923 return parse_stream(dest, ctx, &foo, '\0'); 2924 } 2925 #endif 2926 2927 /* return code is 0 for normal exit, 1 for syntax error */ 2928 static int parse_stream(o_string *dest, struct p_context *ctx, 2929 struct in_str *input, int end_trigger) 2930 { 2931 unsigned int ch, m; 2932 #ifndef __U_BOOT__ 2933 int redir_fd; 2934 redir_type redir_style; 2935 #endif 2936 int next; 2937 2938 /* Only double-quote state is handled in the state variable dest->quote. 2939 * A single-quote triggers a bypass of the main loop until its mate is 2940 * found. When recursing, quote state is passed in via dest->quote. */ 2941 2942 debug_printf("parse_stream, end_trigger=%d\n",end_trigger); 2943 while ((ch=b_getch(input))!=EOF) { 2944 m = map[ch]; 2945 #ifdef __U_BOOT__ 2946 if (input->__promptme == 0) return 1; 2947 #endif 2948 next = (ch == '\n') ? 0 : b_peek(input); 2949 2950 debug_printf("parse_stream: ch=%c (%d) m=%d quote=%d - %c\n", 2951 ch >= ' ' ? ch : '.', ch, m, 2952 dest->quote, ctx->stack == NULL ? '*' : '.'); 2953 2954 if (m==0 || ((m==1 || m==2) && dest->quote)) { 2955 b_addqchr(dest, ch, dest->quote); 2956 } else { 2957 if (m==2) { /* unquoted IFS */ 2958 if (done_word(dest, ctx)) { 2959 return 1; 2960 } 2961 /* If we aren't performing a substitution, treat a newline as a 2962 * command separator. */ 2963 if (end_trigger != '\0' && ch=='\n') 2964 done_pipe(ctx,PIPE_SEQ); 2965 } 2966 if (ch == end_trigger && !dest->quote && ctx->w==RES_NONE) { 2967 debug_printf("leaving parse_stream (triggered)\n"); 2968 return 0; 2969 } 2970 #if 0 2971 if (ch=='\n') { 2972 /* Yahoo! Time to run with it! */ 2973 done_pipe(ctx,PIPE_SEQ); 2974 run_list(ctx->list_head); 2975 initialize_context(ctx); 2976 } 2977 #endif 2978 if (m!=2) switch (ch) { 2979 case '#': 2980 if (dest->length == 0 && !dest->quote) { 2981 while(ch=b_peek(input),ch!=EOF && ch!='\n') { b_getch(input); } 2982 } else { 2983 b_addqchr(dest, ch, dest->quote); 2984 } 2985 break; 2986 case '\\': 2987 if (next == EOF) { 2988 syntax(); 2989 return 1; 2990 } 2991 b_addqchr(dest, '\\', dest->quote); 2992 b_addqchr(dest, b_getch(input), dest->quote); 2993 break; 2994 case '$': 2995 if (handle_dollar(dest, ctx, input)!=0) return 1; 2996 break; 2997 case '\'': 2998 dest->nonnull = 1; 2999 while(ch=b_getch(input),ch!=EOF && ch!='\'') { 3000 #ifdef __U_BOOT__ 3001 if(input->__promptme == 0) return 1; 3002 #endif 3003 b_addchr(dest,ch); 3004 } 3005 if (ch==EOF) { 3006 syntax(); 3007 return 1; 3008 } 3009 break; 3010 case '"': 3011 dest->nonnull = 1; 3012 dest->quote = !dest->quote; 3013 break; 3014 #ifndef __U_BOOT__ 3015 case '`': 3016 process_command_subs(dest, ctx, input, '`'); 3017 break; 3018 case '>': 3019 redir_fd = redirect_opt_num(dest); 3020 done_word(dest, ctx); 3021 redir_style=REDIRECT_OVERWRITE; 3022 if (next == '>') { 3023 redir_style=REDIRECT_APPEND; 3024 b_getch(input); 3025 } else if (next == '(') { 3026 syntax(); /* until we support >(list) Process Substitution */ 3027 return 1; 3028 } 3029 setup_redirect(ctx, redir_fd, redir_style, input); 3030 break; 3031 case '<': 3032 redir_fd = redirect_opt_num(dest); 3033 done_word(dest, ctx); 3034 redir_style=REDIRECT_INPUT; 3035 if (next == '<') { 3036 redir_style=REDIRECT_HEREIS; 3037 b_getch(input); 3038 } else if (next == '>') { 3039 redir_style=REDIRECT_IO; 3040 b_getch(input); 3041 } else if (next == '(') { 3042 syntax(); /* until we support <(list) Process Substitution */ 3043 return 1; 3044 } 3045 setup_redirect(ctx, redir_fd, redir_style, input); 3046 break; 3047 #endif 3048 case ';': 3049 done_word(dest, ctx); 3050 done_pipe(ctx,PIPE_SEQ); 3051 break; 3052 case '&': 3053 done_word(dest, ctx); 3054 if (next=='&') { 3055 b_getch(input); 3056 done_pipe(ctx,PIPE_AND); 3057 } else { 3058 #ifndef __U_BOOT__ 3059 done_pipe(ctx,PIPE_BG); 3060 #else 3061 syntax_err(); 3062 return 1; 3063 #endif 3064 } 3065 break; 3066 case '|': 3067 done_word(dest, ctx); 3068 if (next=='|') { 3069 b_getch(input); 3070 done_pipe(ctx,PIPE_OR); 3071 } else { 3072 /* we could pick up a file descriptor choice here 3073 * with redirect_opt_num(), but bash doesn't do it. 3074 * "echo foo 2| cat" yields "foo 2". */ 3075 #ifndef __U_BOOT__ 3076 done_command(ctx); 3077 #else 3078 syntax_err(); 3079 return 1; 3080 #endif 3081 } 3082 break; 3083 #ifndef __U_BOOT__ 3084 case '(': 3085 case '{': 3086 if (parse_group(dest, ctx, input, ch)!=0) return 1; 3087 break; 3088 case ')': 3089 case '}': 3090 syntax(); /* Proper use of this character caught by end_trigger */ 3091 return 1; 3092 break; 3093 #endif 3094 case SUBSTED_VAR_SYMBOL: 3095 dest->nonnull = 1; 3096 while (ch = b_getch(input), ch != EOF && 3097 ch != SUBSTED_VAR_SYMBOL) { 3098 debug_printf("subst, pass=%d\n", ch); 3099 if (input->__promptme == 0) 3100 return 1; 3101 b_addchr(dest, ch); 3102 } 3103 debug_printf("subst, term=%d\n", ch); 3104 if (ch == EOF) { 3105 syntax(); 3106 return 1; 3107 } 3108 break; 3109 default: 3110 syntax(); /* this is really an internal logic error */ 3111 return 1; 3112 } 3113 } 3114 } 3115 /* complain if quote? No, maybe we just finished a command substitution 3116 * that was quoted. Example: 3117 * $ echo "`cat foo` plus more" 3118 * and we just got the EOF generated by the subshell that ran "cat foo" 3119 * The only real complaint is if we got an EOF when end_trigger != '\0', 3120 * that is, we were really supposed to get end_trigger, and never got 3121 * one before the EOF. Can't use the standard "syntax error" return code, 3122 * so that parse_stream_outer can distinguish the EOF and exit smoothly. */ 3123 debug_printf("leaving parse_stream (EOF)\n"); 3124 if (end_trigger != '\0') return -1; 3125 return 0; 3126 } 3127 3128 static void mapset(const unsigned char *set, int code) 3129 { 3130 const unsigned char *s; 3131 for (s=set; *s; s++) map[*s] = code; 3132 } 3133 3134 static void update_ifs_map(void) 3135 { 3136 /* char *ifs and char map[256] are both globals. */ 3137 ifs = (uchar *)getenv("IFS"); 3138 if (ifs == NULL) ifs=(uchar *)" \t\n"; 3139 /* Precompute a list of 'flow through' behavior so it can be treated 3140 * quickly up front. Computation is necessary because of IFS. 3141 * Special case handling of IFS == " \t\n" is not implemented. 3142 * The map[] array only really needs two bits each, and on most machines 3143 * that would be faster because of the reduced L1 cache footprint. 3144 */ 3145 memset(map,0,sizeof(map)); /* most characters flow through always */ 3146 #ifndef __U_BOOT__ 3147 mapset((uchar *)"\\$'\"`", 3); /* never flow through */ 3148 mapset((uchar *)"<>;&|(){}#", 1); /* flow through if quoted */ 3149 #else 3150 { 3151 uchar subst[2] = {SUBSTED_VAR_SYMBOL, 0}; 3152 mapset(subst, 3); /* never flow through */ 3153 } 3154 mapset((uchar *)"\\$'\"", 3); /* never flow through */ 3155 mapset((uchar *)";&|#", 1); /* flow through if quoted */ 3156 #endif 3157 mapset(ifs, 2); /* also flow through if quoted */ 3158 } 3159 3160 /* most recursion does not come through here, the exeception is 3161 * from builtin_source() */ 3162 static int parse_stream_outer(struct in_str *inp, int flag) 3163 { 3164 3165 struct p_context ctx; 3166 o_string temp=NULL_O_STRING; 3167 int rcode; 3168 #ifdef __U_BOOT__ 3169 int code = 0; 3170 #endif 3171 do { 3172 ctx.type = flag; 3173 initialize_context(&ctx); 3174 update_ifs_map(); 3175 if (!(flag & FLAG_PARSE_SEMICOLON) || (flag & FLAG_REPARSING)) mapset((uchar *)";$&|", 0); 3176 inp->promptmode=1; 3177 rcode = parse_stream(&temp, &ctx, inp, '\n'); 3178 #ifdef __U_BOOT__ 3179 if (rcode == 1) flag_repeat = 0; 3180 #endif 3181 if (rcode != 1 && ctx.old_flag != 0) { 3182 syntax(); 3183 #ifdef __U_BOOT__ 3184 flag_repeat = 0; 3185 #endif 3186 } 3187 if (rcode != 1 && ctx.old_flag == 0) { 3188 done_word(&temp, &ctx); 3189 done_pipe(&ctx,PIPE_SEQ); 3190 #ifndef __U_BOOT__ 3191 run_list(ctx.list_head); 3192 #else 3193 code = run_list(ctx.list_head); 3194 if (code == -2) { /* exit */ 3195 b_free(&temp); 3196 code = 0; 3197 /* XXX hackish way to not allow exit from main loop */ 3198 if (inp->peek == file_peek) { 3199 printf("exit not allowed from main input shell.\n"); 3200 continue; 3201 } 3202 break; 3203 } 3204 if (code == -1) 3205 flag_repeat = 0; 3206 #endif 3207 } else { 3208 if (ctx.old_flag != 0) { 3209 free(ctx.stack); 3210 b_reset(&temp); 3211 } 3212 #ifdef __U_BOOT__ 3213 if (inp->__promptme == 0) printf("<INTERRUPT>\n"); 3214 inp->__promptme = 1; 3215 #endif 3216 temp.nonnull = 0; 3217 temp.quote = 0; 3218 inp->p = NULL; 3219 free_pipe_list(ctx.list_head,0); 3220 } 3221 b_free(&temp); 3222 } while (rcode != -1 && !(flag & FLAG_EXIT_FROM_LOOP)); /* loop on syntax errors, return on EOF */ 3223 #ifndef __U_BOOT__ 3224 return 0; 3225 #else 3226 return (code != 0) ? 1 : 0; 3227 #endif /* __U_BOOT__ */ 3228 } 3229 3230 #ifndef __U_BOOT__ 3231 static int parse_string_outer(const char *s, int flag) 3232 #else 3233 int parse_string_outer(const char *s, int flag) 3234 #endif /* __U_BOOT__ */ 3235 { 3236 struct in_str input; 3237 #ifdef __U_BOOT__ 3238 char *p = NULL; 3239 int rcode; 3240 if ( !s || !*s) 3241 return 1; 3242 if (!(p = strchr(s, '\n')) || *++p) { 3243 p = xmalloc(strlen(s) + 2); 3244 strcpy(p, s); 3245 strcat(p, "\n"); 3246 setup_string_in_str(&input, p); 3247 rcode = parse_stream_outer(&input, flag); 3248 free(p); 3249 return rcode; 3250 } else { 3251 #endif 3252 setup_string_in_str(&input, s); 3253 return parse_stream_outer(&input, flag); 3254 #ifdef __U_BOOT__ 3255 } 3256 #endif 3257 } 3258 3259 #ifndef __U_BOOT__ 3260 static int parse_file_outer(FILE *f) 3261 #else 3262 int parse_file_outer(void) 3263 #endif 3264 { 3265 int rcode; 3266 struct in_str input; 3267 #ifndef __U_BOOT__ 3268 setup_file_in_str(&input, f); 3269 #else 3270 setup_file_in_str(&input); 3271 #endif 3272 rcode = parse_stream_outer(&input, FLAG_PARSE_SEMICOLON); 3273 return rcode; 3274 } 3275 3276 #ifdef __U_BOOT__ 3277 #ifdef CONFIG_NEEDS_MANUAL_RELOC 3278 static void u_boot_hush_reloc(void) 3279 { 3280 unsigned long addr; 3281 struct reserved_combo *r; 3282 3283 for (r=reserved_list; r<reserved_list+NRES; r++) { 3284 addr = (ulong) (r->literal) + gd->reloc_off; 3285 r->literal = (char *)addr; 3286 } 3287 } 3288 #endif 3289 3290 int u_boot_hush_start(void) 3291 { 3292 if (top_vars == NULL) { 3293 top_vars = malloc(sizeof(struct variables)); 3294 top_vars->name = "HUSH_VERSION"; 3295 top_vars->value = "0.01"; 3296 top_vars->next = NULL; 3297 top_vars->flg_export = 0; 3298 top_vars->flg_read_only = 1; 3299 #ifdef CONFIG_NEEDS_MANUAL_RELOC 3300 u_boot_hush_reloc(); 3301 #endif 3302 } 3303 return 0; 3304 } 3305 3306 static void *xmalloc(size_t size) 3307 { 3308 void *p = NULL; 3309 3310 if (!(p = malloc(size))) { 3311 printf("ERROR : memory not allocated\n"); 3312 for(;;); 3313 } 3314 return p; 3315 } 3316 3317 static void *xrealloc(void *ptr, size_t size) 3318 { 3319 void *p = NULL; 3320 3321 if (!(p = realloc(ptr, size))) { 3322 printf("ERROR : memory not allocated\n"); 3323 for(;;); 3324 } 3325 return p; 3326 } 3327 #endif /* __U_BOOT__ */ 3328 3329 #ifndef __U_BOOT__ 3330 /* Make sure we have a controlling tty. If we get started under a job 3331 * aware app (like bash for example), make sure we are now in charge so 3332 * we don't fight over who gets the foreground */ 3333 static void setup_job_control(void) 3334 { 3335 static pid_t shell_pgrp; 3336 /* Loop until we are in the foreground. */ 3337 while (tcgetpgrp (shell_terminal) != (shell_pgrp = getpgrp ())) 3338 kill (- shell_pgrp, SIGTTIN); 3339 3340 /* Ignore interactive and job-control signals. */ 3341 signal(SIGINT, SIG_IGN); 3342 signal(SIGQUIT, SIG_IGN); 3343 signal(SIGTERM, SIG_IGN); 3344 signal(SIGTSTP, SIG_IGN); 3345 signal(SIGTTIN, SIG_IGN); 3346 signal(SIGTTOU, SIG_IGN); 3347 signal(SIGCHLD, SIG_IGN); 3348 3349 /* Put ourselves in our own process group. */ 3350 setsid(); 3351 shell_pgrp = getpid (); 3352 setpgid (shell_pgrp, shell_pgrp); 3353 3354 /* Grab control of the terminal. */ 3355 tcsetpgrp(shell_terminal, shell_pgrp); 3356 } 3357 3358 int hush_main(int argc, char * const *argv) 3359 { 3360 int opt; 3361 FILE *input; 3362 char **e = environ; 3363 3364 /* XXX what should these be while sourcing /etc/profile? */ 3365 global_argc = argc; 3366 global_argv = argv; 3367 3368 /* (re?) initialize globals. Sometimes hush_main() ends up calling 3369 * hush_main(), therefore we cannot rely on the BSS to zero out this 3370 * stuff. Reset these to 0 every time. */ 3371 ifs = NULL; 3372 /* map[] is taken care of with call to update_ifs_map() */ 3373 fake_mode = 0; 3374 interactive = 0; 3375 close_me_head = NULL; 3376 last_bg_pid = 0; 3377 job_list = NULL; 3378 last_jobid = 0; 3379 3380 /* Initialize some more globals to non-zero values */ 3381 set_cwd(); 3382 #ifdef CONFIG_FEATURE_COMMAND_EDITING 3383 cmdedit_set_initial_prompt(); 3384 #else 3385 PS1 = NULL; 3386 #endif 3387 PS2 = "> "; 3388 3389 /* initialize our shell local variables with the values 3390 * currently living in the environment */ 3391 if (e) { 3392 for (; *e; e++) 3393 set_local_var(*e, 2); /* without call putenv() */ 3394 } 3395 3396 last_return_code=EXIT_SUCCESS; 3397 3398 3399 if (argv[0] && argv[0][0] == '-') { 3400 debug_printf("\nsourcing /etc/profile\n"); 3401 if ((input = fopen("/etc/profile", "r")) != NULL) { 3402 mark_open(fileno(input)); 3403 parse_file_outer(input); 3404 mark_closed(fileno(input)); 3405 fclose(input); 3406 } 3407 } 3408 input=stdin; 3409 3410 while ((opt = getopt(argc, argv, "c:xif")) > 0) { 3411 switch (opt) { 3412 case 'c': 3413 { 3414 global_argv = argv+optind; 3415 global_argc = argc-optind; 3416 opt = parse_string_outer(optarg, FLAG_PARSE_SEMICOLON); 3417 goto final_return; 3418 } 3419 break; 3420 case 'i': 3421 interactive++; 3422 break; 3423 case 'f': 3424 fake_mode++; 3425 break; 3426 default: 3427 #ifndef BB_VER 3428 fprintf(stderr, "Usage: sh [FILE]...\n" 3429 " or: sh -c command [args]...\n\n"); 3430 exit(EXIT_FAILURE); 3431 #else 3432 show_usage(); 3433 #endif 3434 } 3435 } 3436 /* A shell is interactive if the `-i' flag was given, or if all of 3437 * the following conditions are met: 3438 * no -c command 3439 * no arguments remaining or the -s flag given 3440 * standard input is a terminal 3441 * standard output is a terminal 3442 * Refer to Posix.2, the description of the `sh' utility. */ 3443 if (argv[optind]==NULL && input==stdin && 3444 isatty(fileno(stdin)) && isatty(fileno(stdout))) { 3445 interactive++; 3446 } 3447 3448 debug_printf("\ninteractive=%d\n", interactive); 3449 if (interactive) { 3450 /* Looks like they want an interactive shell */ 3451 #ifndef CONFIG_FEATURE_SH_EXTRA_QUIET 3452 printf( "\n\n" BB_BANNER " hush - the humble shell v0.01 (testing)\n"); 3453 printf( "Enter 'help' for a list of built-in commands.\n\n"); 3454 #endif 3455 setup_job_control(); 3456 } 3457 3458 if (argv[optind]==NULL) { 3459 opt=parse_file_outer(stdin); 3460 goto final_return; 3461 } 3462 3463 debug_printf("\nrunning script '%s'\n", argv[optind]); 3464 global_argv = argv+optind; 3465 global_argc = argc-optind; 3466 input = xfopen(argv[optind], "r"); 3467 opt = parse_file_outer(input); 3468 3469 #ifdef CONFIG_FEATURE_CLEAN_UP 3470 fclose(input); 3471 if (cwd && cwd != unknown) 3472 free((char*)cwd); 3473 { 3474 struct variables *cur, *tmp; 3475 for(cur = top_vars; cur; cur = tmp) { 3476 tmp = cur->next; 3477 if (!cur->flg_read_only) { 3478 free(cur->name); 3479 free(cur->value); 3480 free(cur); 3481 } 3482 } 3483 } 3484 #endif 3485 3486 final_return: 3487 return(opt?opt:last_return_code); 3488 } 3489 #endif 3490 3491 static char *insert_var_value(char *inp) 3492 { 3493 return insert_var_value_sub(inp, 0); 3494 } 3495 3496 static char *insert_var_value_sub(char *inp, int tag_subst) 3497 { 3498 int res_str_len = 0; 3499 int len; 3500 int done = 0; 3501 char *p, *p1, *res_str = NULL; 3502 3503 while ((p = strchr(inp, SPECIAL_VAR_SYMBOL))) { 3504 /* check the beginning of the string for normal charachters */ 3505 if (p != inp) { 3506 /* copy any charachters to the result string */ 3507 len = p - inp; 3508 res_str = xrealloc(res_str, (res_str_len + len)); 3509 strncpy((res_str + res_str_len), inp, len); 3510 res_str_len += len; 3511 } 3512 inp = ++p; 3513 /* find the ending marker */ 3514 p = strchr(inp, SPECIAL_VAR_SYMBOL); 3515 *p = '\0'; 3516 /* look up the value to substitute */ 3517 if ((p1 = lookup_param(inp))) { 3518 if (tag_subst) 3519 len = res_str_len + strlen(p1) + 2; 3520 else 3521 len = res_str_len + strlen(p1); 3522 res_str = xrealloc(res_str, (1 + len)); 3523 if (tag_subst) { 3524 /* 3525 * copy the variable value to the result 3526 * string 3527 */ 3528 strcpy((res_str + res_str_len + 1), p1); 3529 3530 /* 3531 * mark the replaced text to be accepted as 3532 * is 3533 */ 3534 res_str[res_str_len] = SUBSTED_VAR_SYMBOL; 3535 res_str[res_str_len + 1 + strlen(p1)] = 3536 SUBSTED_VAR_SYMBOL; 3537 } else 3538 /* 3539 * copy the variable value to the result 3540 * string 3541 */ 3542 strcpy((res_str + res_str_len), p1); 3543 3544 res_str_len = len; 3545 } 3546 *p = SPECIAL_VAR_SYMBOL; 3547 inp = ++p; 3548 done = 1; 3549 } 3550 if (done) { 3551 res_str = xrealloc(res_str, (1 + res_str_len + strlen(inp))); 3552 strcpy((res_str + res_str_len), inp); 3553 while ((p = strchr(res_str, '\n'))) { 3554 *p = ' '; 3555 } 3556 } 3557 return (res_str == NULL) ? inp : res_str; 3558 } 3559 3560 static char **make_list_in(char **inp, char *name) 3561 { 3562 int len, i; 3563 int name_len = strlen(name); 3564 int n = 0; 3565 char **list; 3566 char *p1, *p2, *p3; 3567 3568 /* create list of variable values */ 3569 list = xmalloc(sizeof(*list)); 3570 for (i = 0; inp[i]; i++) { 3571 p3 = insert_var_value(inp[i]); 3572 p1 = p3; 3573 while (*p1) { 3574 if ((*p1 == ' ')) { 3575 p1++; 3576 continue; 3577 } 3578 if ((p2 = strchr(p1, ' '))) { 3579 len = p2 - p1; 3580 } else { 3581 len = strlen(p1); 3582 p2 = p1 + len; 3583 } 3584 /* we use n + 2 in realloc for list,because we add 3585 * new element and then we will add NULL element */ 3586 list = xrealloc(list, sizeof(*list) * (n + 2)); 3587 list[n] = xmalloc(2 + name_len + len); 3588 strcpy(list[n], name); 3589 strcat(list[n], "="); 3590 strncat(list[n], p1, len); 3591 list[n++][name_len + len + 1] = '\0'; 3592 p1 = p2; 3593 } 3594 if (p3 != inp[i]) free(p3); 3595 } 3596 list[n] = NULL; 3597 return list; 3598 } 3599 3600 /* 3601 * Make new string for parser 3602 * inp - array of argument strings to flatten 3603 * nonnull - indicates argument was quoted when originally parsed 3604 */ 3605 static char *make_string(char **inp, int *nonnull) 3606 { 3607 char *p; 3608 char *str = NULL; 3609 int n; 3610 int len = 2; 3611 char *noeval_str; 3612 int noeval = 0; 3613 3614 noeval_str = get_local_var("HUSH_NO_EVAL"); 3615 if (noeval_str != NULL && *noeval_str != '0' && *noeval_str != '\0') 3616 noeval = 1; 3617 for (n = 0; inp[n]; n++) { 3618 p = insert_var_value_sub(inp[n], noeval); 3619 str = xrealloc(str, (len + strlen(p) + (2 * nonnull[n]))); 3620 if (n) { 3621 strcat(str, " "); 3622 } else { 3623 *str = '\0'; 3624 } 3625 if (nonnull[n]) 3626 strcat(str, "'"); 3627 strcat(str, p); 3628 if (nonnull[n]) 3629 strcat(str, "'"); 3630 len = strlen(str) + 3; 3631 if (p != inp[n]) free(p); 3632 } 3633 len = strlen(str); 3634 *(str + len) = '\n'; 3635 *(str + len + 1) = '\0'; 3636 return str; 3637 } 3638 3639 #ifdef __U_BOOT__ 3640 static int do_showvar(cmd_tbl_t *cmdtp, int flag, int argc, 3641 char * const argv[]) 3642 { 3643 int i, k; 3644 int rcode = 0; 3645 struct variables *cur; 3646 3647 if (argc == 1) { /* Print all env variables */ 3648 for (cur = top_vars; cur; cur = cur->next) { 3649 printf ("%s=%s\n", cur->name, cur->value); 3650 if (ctrlc ()) { 3651 puts ("\n ** Abort\n"); 3652 return 1; 3653 } 3654 } 3655 return 0; 3656 } 3657 for (i = 1; i < argc; ++i) { /* print single env variables */ 3658 char *name = argv[i]; 3659 3660 k = -1; 3661 for (cur = top_vars; cur; cur = cur->next) { 3662 if(strcmp (cur->name, name) == 0) { 3663 k = 0; 3664 printf ("%s=%s\n", cur->name, cur->value); 3665 } 3666 if (ctrlc ()) { 3667 puts ("\n ** Abort\n"); 3668 return 1; 3669 } 3670 } 3671 if (k < 0) { 3672 printf ("## Error: \"%s\" not defined\n", name); 3673 rcode ++; 3674 } 3675 } 3676 return rcode; 3677 } 3678 3679 U_BOOT_CMD( 3680 showvar, CONFIG_SYS_MAXARGS, 1, do_showvar, 3681 "print local hushshell variables", 3682 "\n - print values of all hushshell variables\n" 3683 "showvar name ...\n" 3684 " - print value of hushshell variable 'name'" 3685 ); 3686 3687 #endif 3688 /****************************************************************************/ 3689