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