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 <bootretry.h> 83 #include <cli.h> 84 #include <cli_hush.h> 85 #include <command.h> /* find_cmd */ 86 #ifndef CONFIG_SYS_PROMPT_HUSH_PS2 87 #define CONFIG_SYS_PROMPT_HUSH_PS2 "> " 88 #endif 89 #endif 90 #ifndef __U_BOOT__ 91 #include <ctype.h> /* isalpha, isdigit */ 92 #include <unistd.h> /* getpid */ 93 #include <stdlib.h> /* getenv, atoi */ 94 #include <string.h> /* strchr */ 95 #include <stdio.h> /* popen etc. */ 96 #include <glob.h> /* glob, of course */ 97 #include <stdarg.h> /* va_list */ 98 #include <errno.h> 99 #include <fcntl.h> 100 #include <getopt.h> /* should be pretty obvious */ 101 102 #include <sys/stat.h> /* ulimit */ 103 #include <sys/types.h> 104 #include <sys/wait.h> 105 #include <signal.h> 106 107 /* #include <dmalloc.h> */ 108 109 #if 1 110 #include "busybox.h" 111 #include "cmdedit.h" 112 #else 113 #define applet_name "hush" 114 #include "standalone.h" 115 #define hush_main main 116 #undef CONFIG_FEATURE_SH_FANCY_PROMPT 117 #define BB_BANNER 118 #endif 119 #endif 120 #define SPECIAL_VAR_SYMBOL 03 121 #define SUBSTED_VAR_SYMBOL 04 122 #ifndef __U_BOOT__ 123 #define FLAG_EXIT_FROM_LOOP 1 124 #define FLAG_PARSE_SEMICOLON (1 << 1) /* symbol ';' is special for parser */ 125 #define FLAG_REPARSING (1 << 2) /* >= 2nd pass */ 126 127 #endif 128 129 #ifdef __U_BOOT__ 130 DECLARE_GLOBAL_DATA_PTR; 131 132 #define EXIT_SUCCESS 0 133 #define EOF -1 134 #define syntax() syntax_err() 135 #define xstrdup strdup 136 #define error_msg printf 137 #else 138 typedef enum { 139 REDIRECT_INPUT = 1, 140 REDIRECT_OVERWRITE = 2, 141 REDIRECT_APPEND = 3, 142 REDIRECT_HEREIS = 4, 143 REDIRECT_IO = 5 144 } redir_type; 145 146 /* The descrip member of this structure is only used to make debugging 147 * output pretty */ 148 struct {int mode; int default_fd; char *descrip;} redir_table[] = { 149 { 0, 0, "()" }, 150 { O_RDONLY, 0, "<" }, 151 { O_CREAT|O_TRUNC|O_WRONLY, 1, ">" }, 152 { O_CREAT|O_APPEND|O_WRONLY, 1, ">>" }, 153 { O_RDONLY, -1, "<<" }, 154 { O_RDWR, 1, "<>" } 155 }; 156 #endif 157 158 typedef enum { 159 PIPE_SEQ = 1, 160 PIPE_AND = 2, 161 PIPE_OR = 3, 162 PIPE_BG = 4, 163 } pipe_style; 164 165 /* might eventually control execution */ 166 typedef enum { 167 RES_NONE = 0, 168 RES_IF = 1, 169 RES_THEN = 2, 170 RES_ELIF = 3, 171 RES_ELSE = 4, 172 RES_FI = 5, 173 RES_FOR = 6, 174 RES_WHILE = 7, 175 RES_UNTIL = 8, 176 RES_DO = 9, 177 RES_DONE = 10, 178 RES_XXXX = 11, 179 RES_IN = 12, 180 RES_SNTX = 13 181 } reserved_style; 182 #define FLAG_END (1<<RES_NONE) 183 #define FLAG_IF (1<<RES_IF) 184 #define FLAG_THEN (1<<RES_THEN) 185 #define FLAG_ELIF (1<<RES_ELIF) 186 #define FLAG_ELSE (1<<RES_ELSE) 187 #define FLAG_FI (1<<RES_FI) 188 #define FLAG_FOR (1<<RES_FOR) 189 #define FLAG_WHILE (1<<RES_WHILE) 190 #define FLAG_UNTIL (1<<RES_UNTIL) 191 #define FLAG_DO (1<<RES_DO) 192 #define FLAG_DONE (1<<RES_DONE) 193 #define FLAG_IN (1<<RES_IN) 194 #define FLAG_START (1<<RES_XXXX) 195 196 /* This holds pointers to the various results of parsing */ 197 struct p_context { 198 struct child_prog *child; 199 struct pipe *list_head; 200 struct pipe *pipe; 201 #ifndef __U_BOOT__ 202 struct redir_struct *pending_redirect; 203 #endif 204 reserved_style w; 205 int old_flag; /* for figuring out valid reserved words */ 206 struct p_context *stack; 207 int type; /* define type of parser : ";$" common or special symbol */ 208 /* How about quoting status? */ 209 }; 210 211 #ifndef __U_BOOT__ 212 struct redir_struct { 213 redir_type type; /* type of redirection */ 214 int fd; /* file descriptor being redirected */ 215 int dup; /* -1, or file descriptor being duplicated */ 216 struct redir_struct *next; /* pointer to the next redirect in the list */ 217 glob_t word; /* *word.gl_pathv is the filename */ 218 }; 219 #endif 220 221 struct child_prog { 222 #ifndef __U_BOOT__ 223 pid_t pid; /* 0 if exited */ 224 #endif 225 char **argv; /* program name and arguments */ 226 /* was quoted when parsed; copy of struct o_string.nonnull field */ 227 int *argv_nonnull; 228 #ifdef __U_BOOT__ 229 int argc; /* number of program arguments */ 230 #endif 231 struct pipe *group; /* if non-NULL, first in group or subshell */ 232 #ifndef __U_BOOT__ 233 int subshell; /* flag, non-zero if group must be forked */ 234 struct redir_struct *redirects; /* I/O redirections */ 235 glob_t glob_result; /* result of parameter globbing */ 236 int is_stopped; /* is the program currently running? */ 237 struct pipe *family; /* pointer back to the child's parent pipe */ 238 #endif 239 int sp; /* number of SPECIAL_VAR_SYMBOL */ 240 int type; 241 }; 242 243 struct pipe { 244 #ifndef __U_BOOT__ 245 int jobid; /* job number */ 246 #endif 247 int num_progs; /* total number of programs in job */ 248 #ifndef __U_BOOT__ 249 int running_progs; /* number of programs running */ 250 char *text; /* name of job */ 251 char *cmdbuf; /* buffer various argv's point into */ 252 pid_t pgrp; /* process group ID for the job */ 253 #endif 254 struct child_prog *progs; /* array of commands in pipe */ 255 struct pipe *next; /* to track background commands */ 256 #ifndef __U_BOOT__ 257 int stopped_progs; /* number of programs alive, but stopped */ 258 int job_context; /* bitmask defining current context */ 259 #endif 260 pipe_style followup; /* PIPE_BG, PIPE_SEQ, PIPE_OR, PIPE_AND */ 261 reserved_style r_mode; /* supports if, for, while, until */ 262 }; 263 264 #ifndef __U_BOOT__ 265 struct close_me { 266 int fd; 267 struct close_me *next; 268 }; 269 #endif 270 271 struct variables { 272 char *name; 273 char *value; 274 int flg_export; 275 int flg_read_only; 276 struct variables *next; 277 }; 278 279 /* globals, connect us to the outside world 280 * the first three support $?, $#, and $1 */ 281 #ifndef __U_BOOT__ 282 char **global_argv; 283 unsigned int global_argc; 284 #endif 285 static unsigned int last_return_code; 286 #ifndef __U_BOOT__ 287 extern char **environ; /* This is in <unistd.h>, but protected with __USE_GNU */ 288 #endif 289 290 /* "globals" within this file */ 291 static uchar *ifs; 292 static char map[256]; 293 #ifndef __U_BOOT__ 294 static int fake_mode; 295 static int interactive; 296 static struct close_me *close_me_head; 297 static const char *cwd; 298 static struct pipe *job_list; 299 static unsigned int last_bg_pid; 300 static unsigned int last_jobid; 301 static unsigned int shell_terminal; 302 static char *PS1; 303 static char *PS2; 304 struct variables shell_ver = { "HUSH_VERSION", "0.01", 1, 1, 0 }; 305 struct variables *top_vars = &shell_ver; 306 #else 307 static int flag_repeat = 0; 308 static int do_repeat = 0; 309 static struct variables *top_vars = NULL ; 310 #endif /*__U_BOOT__ */ 311 312 #define B_CHUNK (100) 313 #define B_NOSPAC 1 314 315 typedef struct { 316 char *data; 317 int length; 318 int maxlen; 319 int quote; 320 int nonnull; 321 } o_string; 322 #define NULL_O_STRING {NULL,0,0,0,0} 323 /* used for initialization: 324 o_string foo = NULL_O_STRING; */ 325 326 /* I can almost use ordinary FILE *. Is open_memstream() universally 327 * available? Where is it documented? */ 328 struct in_str { 329 const char *p; 330 #ifndef __U_BOOT__ 331 char peek_buf[2]; 332 #endif 333 int __promptme; 334 int promptmode; 335 #ifndef __U_BOOT__ 336 FILE *file; 337 #endif 338 int (*get) (struct in_str *); 339 int (*peek) (struct in_str *); 340 }; 341 #define b_getch(input) ((input)->get(input)) 342 #define b_peek(input) ((input)->peek(input)) 343 344 #ifndef __U_BOOT__ 345 #define JOB_STATUS_FORMAT "[%d] %-22s %.40s\n" 346 347 struct built_in_command { 348 char *cmd; /* name */ 349 char *descr; /* description */ 350 int (*function) (struct child_prog *); /* function ptr */ 351 }; 352 #endif 353 354 /* define DEBUG_SHELL for debugging output (obviously ;-)) */ 355 #if 0 356 #define DEBUG_SHELL 357 #endif 358 359 /* This should be in utility.c */ 360 #ifdef DEBUG_SHELL 361 #ifndef __U_BOOT__ 362 static void debug_printf(const char *format, ...) 363 { 364 va_list args; 365 va_start(args, format); 366 vfprintf(stderr, format, args); 367 va_end(args); 368 } 369 #else 370 #define debug_printf(fmt,args...) printf (fmt ,##args) 371 #endif 372 #else 373 static inline void debug_printf(const char *format, ...) { } 374 #endif 375 #define final_printf debug_printf 376 377 #ifdef __U_BOOT__ 378 static void syntax_err(void) { 379 printf("syntax error\n"); 380 } 381 #else 382 static void __syntax(char *file, int line) { 383 error_msg("syntax error %s:%d", file, line); 384 } 385 #define syntax() __syntax(__FILE__, __LINE__) 386 #endif 387 388 #ifdef __U_BOOT__ 389 static void *xmalloc(size_t size); 390 static void *xrealloc(void *ptr, size_t size); 391 #else 392 /* Index of subroutines: */ 393 /* function prototypes for builtins */ 394 static int builtin_cd(struct child_prog *child); 395 static int builtin_env(struct child_prog *child); 396 static int builtin_eval(struct child_prog *child); 397 static int builtin_exec(struct child_prog *child); 398 static int builtin_exit(struct child_prog *child); 399 static int builtin_export(struct child_prog *child); 400 static int builtin_fg_bg(struct child_prog *child); 401 static int builtin_help(struct child_prog *child); 402 static int builtin_jobs(struct child_prog *child); 403 static int builtin_pwd(struct child_prog *child); 404 static int builtin_read(struct child_prog *child); 405 static int builtin_set(struct child_prog *child); 406 static int builtin_shift(struct child_prog *child); 407 static int builtin_source(struct child_prog *child); 408 static int builtin_umask(struct child_prog *child); 409 static int builtin_unset(struct child_prog *child); 410 static int builtin_not_written(struct child_prog *child); 411 #endif 412 /* o_string manipulation: */ 413 static int b_check_space(o_string *o, int len); 414 static int b_addchr(o_string *o, int ch); 415 static void b_reset(o_string *o); 416 static int b_addqchr(o_string *o, int ch, int quote); 417 #ifndef __U_BOOT__ 418 static int b_adduint(o_string *o, unsigned int i); 419 #endif 420 /* in_str manipulations: */ 421 static int static_get(struct in_str *i); 422 static int static_peek(struct in_str *i); 423 static int file_get(struct in_str *i); 424 static int file_peek(struct in_str *i); 425 #ifndef __U_BOOT__ 426 static void setup_file_in_str(struct in_str *i, FILE *f); 427 #else 428 static void setup_file_in_str(struct in_str *i); 429 #endif 430 static void setup_string_in_str(struct in_str *i, const char *s); 431 #ifndef __U_BOOT__ 432 /* close_me manipulations: */ 433 static void mark_open(int fd); 434 static void mark_closed(int fd); 435 static void close_all(void); 436 #endif 437 /* "run" the final data structures: */ 438 static char *indenter(int i); 439 static int free_pipe_list(struct pipe *head, int indent); 440 static int free_pipe(struct pipe *pi, int indent); 441 /* really run the final data structures: */ 442 #ifndef __U_BOOT__ 443 static int setup_redirects(struct child_prog *prog, int squirrel[]); 444 #endif 445 static int run_list_real(struct pipe *pi); 446 #ifndef __U_BOOT__ 447 static void pseudo_exec(struct child_prog *child) __attribute__ ((noreturn)); 448 #endif 449 static int run_pipe_real(struct pipe *pi); 450 /* extended glob support: */ 451 #ifndef __U_BOOT__ 452 static int globhack(const char *src, int flags, glob_t *pglob); 453 static int glob_needed(const char *s); 454 static int xglob(o_string *dest, int flags, glob_t *pglob); 455 #endif 456 /* variable assignment: */ 457 static int is_assignment(const char *s); 458 /* data structure manipulation: */ 459 #ifndef __U_BOOT__ 460 static int setup_redirect(struct p_context *ctx, int fd, redir_type style, struct in_str *input); 461 #endif 462 static void initialize_context(struct p_context *ctx); 463 static int done_word(o_string *dest, struct p_context *ctx); 464 static int done_command(struct p_context *ctx); 465 static int done_pipe(struct p_context *ctx, pipe_style type); 466 /* primary string parsing: */ 467 #ifndef __U_BOOT__ 468 static int redirect_dup_num(struct in_str *input); 469 static int redirect_opt_num(o_string *o); 470 static int process_command_subs(o_string *dest, struct p_context *ctx, struct in_str *input, int subst_end); 471 static int parse_group(o_string *dest, struct p_context *ctx, struct in_str *input, int ch); 472 #endif 473 static char *lookup_param(char *src); 474 static char *make_string(char **inp, int *nonnull); 475 static int handle_dollar(o_string *dest, struct p_context *ctx, struct in_str *input); 476 #ifndef __U_BOOT__ 477 static int parse_string(o_string *dest, struct p_context *ctx, const char *src); 478 #endif 479 static int parse_stream(o_string *dest, struct p_context *ctx, struct in_str *input0, int end_trigger); 480 /* setup: */ 481 static int parse_stream_outer(struct in_str *inp, int flag); 482 #ifndef __U_BOOT__ 483 static int parse_string_outer(const char *s, int flag); 484 static int parse_file_outer(FILE *f); 485 #endif 486 #ifndef __U_BOOT__ 487 /* job management: */ 488 static int checkjobs(struct pipe* fg_pipe); 489 static void insert_bg_job(struct pipe *pi); 490 static void remove_bg_job(struct pipe *pi); 491 #endif 492 /* local variable support */ 493 static char **make_list_in(char **inp, char *name); 494 static char *insert_var_value(char *inp); 495 static char *insert_var_value_sub(char *inp, int tag_subst); 496 497 #ifndef __U_BOOT__ 498 /* Table of built-in functions. They can be forked or not, depending on 499 * context: within pipes, they fork. As simple commands, they do not. 500 * When used in non-forking context, they can change global variables 501 * in the parent shell process. If forked, of course they can not. 502 * For example, 'unset foo | whatever' will parse and run, but foo will 503 * still be set at the end. */ 504 static struct built_in_command bltins[] = { 505 {"bg", "Resume a job in the background", builtin_fg_bg}, 506 {"break", "Exit for, while or until loop", builtin_not_written}, 507 {"cd", "Change working directory", builtin_cd}, 508 {"continue", "Continue for, while or until loop", builtin_not_written}, 509 {"env", "Print all environment variables", builtin_env}, 510 {"eval", "Construct and run shell command", builtin_eval}, 511 {"exec", "Exec command, replacing this shell with the exec'd process", 512 builtin_exec}, 513 {"exit", "Exit from shell()", builtin_exit}, 514 {"export", "Set environment variable", builtin_export}, 515 {"fg", "Bring job into the foreground", builtin_fg_bg}, 516 {"jobs", "Lists the active jobs", builtin_jobs}, 517 {"pwd", "Print current directory", builtin_pwd}, 518 {"read", "Input environment variable", builtin_read}, 519 {"return", "Return from a function", builtin_not_written}, 520 {"set", "Set/unset shell local variables", builtin_set}, 521 {"shift", "Shift positional parameters", builtin_shift}, 522 {"trap", "Trap signals", builtin_not_written}, 523 {"ulimit","Controls resource limits", builtin_not_written}, 524 {"umask","Sets file creation mask", builtin_umask}, 525 {"unset", "Unset environment variable", builtin_unset}, 526 {".", "Source-in and run commands in a file", builtin_source}, 527 {"help", "List shell built-in commands", builtin_help}, 528 {NULL, NULL, NULL} 529 }; 530 531 static const char *set_cwd(void) 532 { 533 if(cwd==unknown) 534 cwd = NULL; /* xgetcwd(arg) called free(arg) */ 535 cwd = xgetcwd((char *)cwd); 536 if (!cwd) 537 cwd = unknown; 538 return cwd; 539 } 540 541 /* built-in 'eval' handler */ 542 static int builtin_eval(struct child_prog *child) 543 { 544 char *str = NULL; 545 int rcode = EXIT_SUCCESS; 546 547 if (child->argv[1]) { 548 str = make_string(child->argv + 1); 549 parse_string_outer(str, FLAG_EXIT_FROM_LOOP | 550 FLAG_PARSE_SEMICOLON); 551 free(str); 552 rcode = last_return_code; 553 } 554 return rcode; 555 } 556 557 /* built-in 'cd <path>' handler */ 558 static int builtin_cd(struct child_prog *child) 559 { 560 char *newdir; 561 if (child->argv[1] == NULL) 562 newdir = getenv("HOME"); 563 else 564 newdir = child->argv[1]; 565 if (chdir(newdir)) { 566 printf("cd: %s: %s\n", newdir, strerror(errno)); 567 return EXIT_FAILURE; 568 } 569 set_cwd(); 570 return EXIT_SUCCESS; 571 } 572 573 /* built-in 'env' handler */ 574 static int builtin_env(struct child_prog *dummy) 575 { 576 char **e = environ; 577 if (e == NULL) return EXIT_FAILURE; 578 for (; *e; e++) { 579 puts(*e); 580 } 581 return EXIT_SUCCESS; 582 } 583 584 /* built-in 'exec' handler */ 585 static int builtin_exec(struct child_prog *child) 586 { 587 if (child->argv[1] == NULL) 588 return EXIT_SUCCESS; /* Really? */ 589 child->argv++; 590 pseudo_exec(child); 591 /* never returns */ 592 } 593 594 /* built-in 'exit' handler */ 595 static int builtin_exit(struct child_prog *child) 596 { 597 if (child->argv[1] == NULL) 598 exit(last_return_code); 599 exit (atoi(child->argv[1])); 600 } 601 602 /* built-in 'export VAR=value' handler */ 603 static int builtin_export(struct child_prog *child) 604 { 605 int res = 0; 606 char *name = child->argv[1]; 607 608 if (name == NULL) { 609 return (builtin_env(child)); 610 } 611 612 name = strdup(name); 613 614 if(name) { 615 char *value = strchr(name, '='); 616 617 if (!value) { 618 char *tmp; 619 /* They are exporting something without an =VALUE */ 620 621 value = get_local_var(name); 622 if (value) { 623 size_t ln = strlen(name); 624 625 tmp = realloc(name, ln+strlen(value)+2); 626 if(tmp==NULL) 627 res = -1; 628 else { 629 sprintf(tmp+ln, "=%s", value); 630 name = tmp; 631 } 632 } else { 633 /* bash does not return an error when trying to export 634 * an undefined variable. Do likewise. */ 635 res = 1; 636 } 637 } 638 } 639 if (res<0) 640 perror_msg("export"); 641 else if(res==0) 642 res = set_local_var(name, 1); 643 else 644 res = 0; 645 free(name); 646 return res; 647 } 648 649 /* built-in 'fg' and 'bg' handler */ 650 static int builtin_fg_bg(struct child_prog *child) 651 { 652 int i, jobnum; 653 struct pipe *pi=NULL; 654 655 if (!interactive) 656 return EXIT_FAILURE; 657 /* If they gave us no args, assume they want the last backgrounded task */ 658 if (!child->argv[1]) { 659 for (pi = job_list; pi; pi = pi->next) { 660 if (pi->jobid == last_jobid) { 661 break; 662 } 663 } 664 if (!pi) { 665 error_msg("%s: no current job", child->argv[0]); 666 return EXIT_FAILURE; 667 } 668 } else { 669 if (sscanf(child->argv[1], "%%%d", &jobnum) != 1) { 670 error_msg("%s: bad argument '%s'", child->argv[0], child->argv[1]); 671 return EXIT_FAILURE; 672 } 673 for (pi = job_list; pi; pi = pi->next) { 674 if (pi->jobid == jobnum) { 675 break; 676 } 677 } 678 if (!pi) { 679 error_msg("%s: %d: no such job", child->argv[0], jobnum); 680 return EXIT_FAILURE; 681 } 682 } 683 684 if (*child->argv[0] == 'f') { 685 /* Put the job into the foreground. */ 686 tcsetpgrp(shell_terminal, pi->pgrp); 687 } 688 689 /* Restart the processes in the job */ 690 for (i = 0; i < pi->num_progs; i++) 691 pi->progs[i].is_stopped = 0; 692 693 if ( (i=kill(- pi->pgrp, SIGCONT)) < 0) { 694 if (i == ESRCH) { 695 remove_bg_job(pi); 696 } else { 697 perror_msg("kill (SIGCONT)"); 698 } 699 } 700 701 pi->stopped_progs = 0; 702 return EXIT_SUCCESS; 703 } 704 705 /* built-in 'help' handler */ 706 static int builtin_help(struct child_prog *dummy) 707 { 708 struct built_in_command *x; 709 710 printf("\nBuilt-in commands:\n"); 711 printf("-------------------\n"); 712 for (x = bltins; x->cmd; x++) { 713 if (x->descr==NULL) 714 continue; 715 printf("%s\t%s\n", x->cmd, x->descr); 716 } 717 printf("\n\n"); 718 return EXIT_SUCCESS; 719 } 720 721 /* built-in 'jobs' handler */ 722 static int builtin_jobs(struct child_prog *child) 723 { 724 struct pipe *job; 725 char *status_string; 726 727 for (job = job_list; job; job = job->next) { 728 if (job->running_progs == job->stopped_progs) 729 status_string = "Stopped"; 730 else 731 status_string = "Running"; 732 733 printf(JOB_STATUS_FORMAT, job->jobid, status_string, job->text); 734 } 735 return EXIT_SUCCESS; 736 } 737 738 739 /* built-in 'pwd' handler */ 740 static int builtin_pwd(struct child_prog *dummy) 741 { 742 puts(set_cwd()); 743 return EXIT_SUCCESS; 744 } 745 746 /* built-in 'read VAR' handler */ 747 static int builtin_read(struct child_prog *child) 748 { 749 int res; 750 751 if (child->argv[1]) { 752 char string[BUFSIZ]; 753 char *var = 0; 754 755 string[0] = 0; /* In case stdin has only EOF */ 756 /* read string */ 757 fgets(string, sizeof(string), stdin); 758 chomp(string); 759 var = malloc(strlen(child->argv[1])+strlen(string)+2); 760 if(var) { 761 sprintf(var, "%s=%s", child->argv[1], string); 762 res = set_local_var(var, 0); 763 } else 764 res = -1; 765 if (res) 766 fprintf(stderr, "read: %m\n"); 767 free(var); /* So not move up to avoid breaking errno */ 768 return res; 769 } else { 770 do res=getchar(); while(res!='\n' && res!=EOF); 771 return 0; 772 } 773 } 774 775 /* built-in 'set VAR=value' handler */ 776 static int builtin_set(struct child_prog *child) 777 { 778 char *temp = child->argv[1]; 779 struct variables *e; 780 781 if (temp == NULL) 782 for(e = top_vars; e; e=e->next) 783 printf("%s=%s\n", e->name, e->value); 784 else 785 set_local_var(temp, 0); 786 787 return EXIT_SUCCESS; 788 } 789 790 791 /* Built-in 'shift' handler */ 792 static int builtin_shift(struct child_prog *child) 793 { 794 int n=1; 795 if (child->argv[1]) { 796 n=atoi(child->argv[1]); 797 } 798 if (n>=0 && n<global_argc) { 799 /* XXX This probably breaks $0 */ 800 global_argc -= n; 801 global_argv += n; 802 return EXIT_SUCCESS; 803 } else { 804 return EXIT_FAILURE; 805 } 806 } 807 808 /* Built-in '.' handler (read-in and execute commands from file) */ 809 static int builtin_source(struct child_prog *child) 810 { 811 FILE *input; 812 int status; 813 814 if (child->argv[1] == NULL) 815 return EXIT_FAILURE; 816 817 /* XXX search through $PATH is missing */ 818 input = fopen(child->argv[1], "r"); 819 if (!input) { 820 error_msg("Couldn't open file '%s'", child->argv[1]); 821 return EXIT_FAILURE; 822 } 823 824 /* Now run the file */ 825 /* XXX argv and argc are broken; need to save old global_argv 826 * (pointer only is OK!) on this stack frame, 827 * set global_argv=child->argv+1, recurse, and restore. */ 828 mark_open(fileno(input)); 829 status = parse_file_outer(input); 830 mark_closed(fileno(input)); 831 fclose(input); 832 return (status); 833 } 834 835 static int builtin_umask(struct child_prog *child) 836 { 837 mode_t new_umask; 838 const char *arg = child->argv[1]; 839 char *end; 840 if (arg) { 841 new_umask=strtoul(arg, &end, 8); 842 if (*end!='\0' || end == arg) { 843 return EXIT_FAILURE; 844 } 845 } else { 846 printf("%.3o\n", (unsigned int) (new_umask=umask(0))); 847 } 848 umask(new_umask); 849 return EXIT_SUCCESS; 850 } 851 852 /* built-in 'unset VAR' handler */ 853 static int builtin_unset(struct child_prog *child) 854 { 855 /* bash returned already true */ 856 unset_local_var(child->argv[1]); 857 return EXIT_SUCCESS; 858 } 859 860 static int builtin_not_written(struct child_prog *child) 861 { 862 printf("builtin_%s not written\n",child->argv[0]); 863 return EXIT_FAILURE; 864 } 865 #endif 866 867 static int b_check_space(o_string *o, int len) 868 { 869 /* It would be easy to drop a more restrictive policy 870 * in here, such as setting a maximum string length */ 871 if (o->length + len > o->maxlen) { 872 char *old_data = o->data; 873 /* assert (data == NULL || o->maxlen != 0); */ 874 o->maxlen += max(2*len, B_CHUNK); 875 o->data = realloc(o->data, 1 + o->maxlen); 876 if (o->data == NULL) { 877 free(old_data); 878 } 879 } 880 return o->data == NULL; 881 } 882 883 static int b_addchr(o_string *o, int ch) 884 { 885 debug_printf("b_addchr: %c %d %p\n", ch, o->length, o); 886 if (b_check_space(o, 1)) return B_NOSPAC; 887 o->data[o->length] = ch; 888 o->length++; 889 o->data[o->length] = '\0'; 890 return 0; 891 } 892 893 static void b_reset(o_string *o) 894 { 895 o->length = 0; 896 o->nonnull = 0; 897 if (o->data != NULL) *o->data = '\0'; 898 } 899 900 static void b_free(o_string *o) 901 { 902 b_reset(o); 903 free(o->data); 904 o->data = NULL; 905 o->maxlen = 0; 906 } 907 908 /* My analysis of quoting semantics tells me that state information 909 * is associated with a destination, not a source. 910 */ 911 static int b_addqchr(o_string *o, int ch, int quote) 912 { 913 if (quote && strchr("*?[\\",ch)) { 914 int rc; 915 rc = b_addchr(o, '\\'); 916 if (rc) return rc; 917 } 918 return b_addchr(o, ch); 919 } 920 921 #ifndef __U_BOOT__ 922 static int b_adduint(o_string *o, unsigned int i) 923 { 924 int r; 925 char *p = simple_itoa(i); 926 /* no escape checking necessary */ 927 do r=b_addchr(o, *p++); while (r==0 && *p); 928 return r; 929 } 930 #endif 931 932 static int static_get(struct in_str *i) 933 { 934 int ch = *i->p++; 935 if (ch=='\0') return EOF; 936 return ch; 937 } 938 939 static int static_peek(struct in_str *i) 940 { 941 return *i->p; 942 } 943 944 #ifndef __U_BOOT__ 945 static inline void cmdedit_set_initial_prompt(void) 946 { 947 #ifndef CONFIG_FEATURE_SH_FANCY_PROMPT 948 PS1 = NULL; 949 #else 950 PS1 = getenv("PS1"); 951 if(PS1==0) 952 PS1 = "\\w \\$ "; 953 #endif 954 } 955 956 static inline void setup_prompt_string(int promptmode, char **prompt_str) 957 { 958 debug_printf("setup_prompt_string %d ",promptmode); 959 #ifndef CONFIG_FEATURE_SH_FANCY_PROMPT 960 /* Set up the prompt */ 961 if (promptmode == 1) { 962 free(PS1); 963 PS1=xmalloc(strlen(cwd)+4); 964 sprintf(PS1, "%s %s", cwd, ( geteuid() != 0 ) ? "$ ":"# "); 965 *prompt_str = PS1; 966 } else { 967 *prompt_str = PS2; 968 } 969 #else 970 *prompt_str = (promptmode==1)? PS1 : PS2; 971 #endif 972 debug_printf("result %s\n",*prompt_str); 973 } 974 #endif 975 976 static void get_user_input(struct in_str *i) 977 { 978 #ifndef __U_BOOT__ 979 char *prompt_str; 980 static char the_command[BUFSIZ]; 981 982 setup_prompt_string(i->promptmode, &prompt_str); 983 #ifdef CONFIG_FEATURE_COMMAND_EDITING 984 /* 985 ** enable command line editing only while a command line 986 ** is actually being read; otherwise, we'll end up bequeathing 987 ** atexit() handlers and other unwanted stuff to our 988 ** child processes (rob@sysgo.de) 989 */ 990 cmdedit_read_input(prompt_str, the_command); 991 #else 992 fputs(prompt_str, stdout); 993 fflush(stdout); 994 the_command[0]=fgetc(i->file); 995 the_command[1]='\0'; 996 #endif 997 fflush(stdout); 998 i->p = the_command; 999 #else 1000 int n; 1001 static char the_command[CONFIG_SYS_CBSIZE + 1]; 1002 1003 #ifdef CONFIG_BOOT_RETRY_TIME 1004 # ifndef CONFIG_RESET_TO_RETRY 1005 # error "This currently only works with CONFIG_RESET_TO_RETRY enabled" 1006 # endif 1007 reset_cmd_timeout(); 1008 #endif 1009 i->__promptme = 1; 1010 if (i->promptmode == 1) { 1011 n = cli_readline(CONFIG_SYS_PROMPT); 1012 } else { 1013 n = cli_readline(CONFIG_SYS_PROMPT_HUSH_PS2); 1014 } 1015 #ifdef CONFIG_BOOT_RETRY_TIME 1016 if (n == -2) { 1017 puts("\nTimeout waiting for command\n"); 1018 # ifdef CONFIG_RESET_TO_RETRY 1019 do_reset(NULL, 0, 0, NULL); 1020 # else 1021 # error "This currently only works with CONFIG_RESET_TO_RETRY enabled" 1022 # endif 1023 } 1024 #endif 1025 if (n == -1 ) { 1026 flag_repeat = 0; 1027 i->__promptme = 0; 1028 } 1029 n = strlen(console_buffer); 1030 console_buffer[n] = '\n'; 1031 console_buffer[n+1]= '\0'; 1032 if (had_ctrlc()) flag_repeat = 0; 1033 clear_ctrlc(); 1034 do_repeat = 0; 1035 if (i->promptmode == 1) { 1036 if (console_buffer[0] == '\n'&& flag_repeat == 0) { 1037 strcpy(the_command,console_buffer); 1038 } 1039 else { 1040 if (console_buffer[0] != '\n') { 1041 strcpy(the_command,console_buffer); 1042 flag_repeat = 1; 1043 } 1044 else { 1045 do_repeat = 1; 1046 } 1047 } 1048 i->p = the_command; 1049 } 1050 else { 1051 if (console_buffer[0] != '\n') { 1052 if (strlen(the_command) + strlen(console_buffer) 1053 < CONFIG_SYS_CBSIZE) { 1054 n = strlen(the_command); 1055 the_command[n-1] = ' '; 1056 strcpy(&the_command[n],console_buffer); 1057 } 1058 else { 1059 the_command[0] = '\n'; 1060 the_command[1] = '\0'; 1061 flag_repeat = 0; 1062 } 1063 } 1064 if (i->__promptme == 0) { 1065 the_command[0] = '\n'; 1066 the_command[1] = '\0'; 1067 } 1068 i->p = console_buffer; 1069 } 1070 #endif 1071 } 1072 1073 /* This is the magic location that prints prompts 1074 * and gets data back from the user */ 1075 static int file_get(struct in_str *i) 1076 { 1077 int ch; 1078 1079 ch = 0; 1080 /* If there is data waiting, eat it up */ 1081 if (i->p && *i->p) { 1082 ch = *i->p++; 1083 } else { 1084 /* need to double check i->file because we might be doing something 1085 * more complicated by now, like sourcing or substituting. */ 1086 #ifndef __U_BOOT__ 1087 if (i->__promptme && interactive && i->file == stdin) { 1088 while(! i->p || (interactive && strlen(i->p)==0) ) { 1089 #else 1090 while(! i->p || strlen(i->p)==0 ) { 1091 #endif 1092 get_user_input(i); 1093 } 1094 i->promptmode=2; 1095 #ifndef __U_BOOT__ 1096 i->__promptme = 0; 1097 #endif 1098 if (i->p && *i->p) { 1099 ch = *i->p++; 1100 } 1101 #ifndef __U_BOOT__ 1102 } else { 1103 ch = fgetc(i->file); 1104 } 1105 1106 #endif 1107 debug_printf("b_getch: got a %d\n", ch); 1108 } 1109 #ifndef __U_BOOT__ 1110 if (ch == '\n') i->__promptme=1; 1111 #endif 1112 return ch; 1113 } 1114 1115 /* All the callers guarantee this routine will never be 1116 * used right after a newline, so prompting is not needed. 1117 */ 1118 static int file_peek(struct in_str *i) 1119 { 1120 #ifndef __U_BOOT__ 1121 if (i->p && *i->p) { 1122 #endif 1123 return *i->p; 1124 #ifndef __U_BOOT__ 1125 } else { 1126 i->peek_buf[0] = fgetc(i->file); 1127 i->peek_buf[1] = '\0'; 1128 i->p = i->peek_buf; 1129 debug_printf("b_peek: got a %d\n", *i->p); 1130 return *i->p; 1131 } 1132 #endif 1133 } 1134 1135 #ifndef __U_BOOT__ 1136 static void setup_file_in_str(struct in_str *i, FILE *f) 1137 #else 1138 static void setup_file_in_str(struct in_str *i) 1139 #endif 1140 { 1141 i->peek = file_peek; 1142 i->get = file_get; 1143 i->__promptme=1; 1144 i->promptmode=1; 1145 #ifndef __U_BOOT__ 1146 i->file = f; 1147 #endif 1148 i->p = NULL; 1149 } 1150 1151 static void setup_string_in_str(struct in_str *i, const char *s) 1152 { 1153 i->peek = static_peek; 1154 i->get = static_get; 1155 i->__promptme=1; 1156 i->promptmode=1; 1157 i->p = s; 1158 } 1159 1160 #ifndef __U_BOOT__ 1161 static void mark_open(int fd) 1162 { 1163 struct close_me *new = xmalloc(sizeof(struct close_me)); 1164 new->fd = fd; 1165 new->next = close_me_head; 1166 close_me_head = new; 1167 } 1168 1169 static void mark_closed(int fd) 1170 { 1171 struct close_me *tmp; 1172 if (close_me_head == NULL || close_me_head->fd != fd) 1173 error_msg_and_die("corrupt close_me"); 1174 tmp = close_me_head; 1175 close_me_head = close_me_head->next; 1176 free(tmp); 1177 } 1178 1179 static void close_all(void) 1180 { 1181 struct close_me *c; 1182 for (c=close_me_head; c; c=c->next) { 1183 close(c->fd); 1184 } 1185 close_me_head = NULL; 1186 } 1187 1188 /* squirrel != NULL means we squirrel away copies of stdin, stdout, 1189 * and stderr if they are redirected. */ 1190 static int setup_redirects(struct child_prog *prog, int squirrel[]) 1191 { 1192 int openfd, mode; 1193 struct redir_struct *redir; 1194 1195 for (redir=prog->redirects; redir; redir=redir->next) { 1196 if (redir->dup == -1 && redir->word.gl_pathv == NULL) { 1197 /* something went wrong in the parse. Pretend it didn't happen */ 1198 continue; 1199 } 1200 if (redir->dup == -1) { 1201 mode=redir_table[redir->type].mode; 1202 openfd = open(redir->word.gl_pathv[0], mode, 0666); 1203 if (openfd < 0) { 1204 /* this could get lost if stderr has been redirected, but 1205 bash and ash both lose it as well (though zsh doesn't!) */ 1206 perror_msg("error opening %s", redir->word.gl_pathv[0]); 1207 return 1; 1208 } 1209 } else { 1210 openfd = redir->dup; 1211 } 1212 1213 if (openfd != redir->fd) { 1214 if (squirrel && redir->fd < 3) { 1215 squirrel[redir->fd] = dup(redir->fd); 1216 } 1217 if (openfd == -3) { 1218 close(openfd); 1219 } else { 1220 dup2(openfd, redir->fd); 1221 if (redir->dup == -1) 1222 close (openfd); 1223 } 1224 } 1225 } 1226 return 0; 1227 } 1228 1229 static void restore_redirects(int squirrel[]) 1230 { 1231 int i, fd; 1232 for (i=0; i<3; i++) { 1233 fd = squirrel[i]; 1234 if (fd != -1) { 1235 /* No error checking. I sure wouldn't know what 1236 * to do with an error if I found one! */ 1237 dup2(fd, i); 1238 close(fd); 1239 } 1240 } 1241 } 1242 1243 /* never returns */ 1244 /* XXX no exit() here. If you don't exec, use _exit instead. 1245 * The at_exit handlers apparently confuse the calling process, 1246 * in particular stdin handling. Not sure why? */ 1247 static void pseudo_exec(struct child_prog *child) 1248 { 1249 int i, rcode; 1250 char *p; 1251 struct built_in_command *x; 1252 if (child->argv) { 1253 for (i=0; is_assignment(child->argv[i]); i++) { 1254 debug_printf("pid %d environment modification: %s\n",getpid(),child->argv[i]); 1255 p = insert_var_value(child->argv[i]); 1256 putenv(strdup(p)); 1257 if (p != child->argv[i]) free(p); 1258 } 1259 child->argv+=i; /* XXX this hack isn't so horrible, since we are about 1260 to exit, and therefore don't need to keep data 1261 structures consistent for free() use. */ 1262 /* If a variable is assigned in a forest, and nobody listens, 1263 * was it ever really set? 1264 */ 1265 if (child->argv[0] == NULL) { 1266 _exit(EXIT_SUCCESS); 1267 } 1268 1269 /* 1270 * Check if the command matches any of the builtins. 1271 * Depending on context, this might be redundant. But it's 1272 * easier to waste a few CPU cycles than it is to figure out 1273 * if this is one of those cases. 1274 */ 1275 for (x = bltins; x->cmd; x++) { 1276 if (strcmp(child->argv[0], x->cmd) == 0 ) { 1277 debug_printf("builtin exec %s\n", child->argv[0]); 1278 rcode = x->function(child); 1279 fflush(stdout); 1280 _exit(rcode); 1281 } 1282 } 1283 1284 /* Check if the command matches any busybox internal commands 1285 * ("applets") here. 1286 * FIXME: This feature is not 100% safe, since 1287 * BusyBox is not fully reentrant, so we have no guarantee the things 1288 * from the .bss are still zeroed, or that things from .data are still 1289 * at their defaults. We could exec ourself from /proc/self/exe, but I 1290 * really dislike relying on /proc for things. We could exec ourself 1291 * from global_argv[0], but if we are in a chroot, we may not be able 1292 * to find ourself... */ 1293 #ifdef CONFIG_FEATURE_SH_STANDALONE_SHELL 1294 { 1295 int argc_l; 1296 char** argv_l=child->argv; 1297 char *name = child->argv[0]; 1298 1299 #ifdef CONFIG_FEATURE_SH_APPLETS_ALWAYS_WIN 1300 /* Following discussions from November 2000 on the busybox mailing 1301 * list, the default configuration, (without 1302 * get_last_path_component()) lets the user force use of an 1303 * external command by specifying the full (with slashes) filename. 1304 * If you enable CONFIG_FEATURE_SH_APPLETS_ALWAYS_WIN then applets 1305 * _aways_ override external commands, so if you want to run 1306 * /bin/cat, it will use BusyBox cat even if /bin/cat exists on the 1307 * filesystem and is _not_ busybox. Some systems may want this, 1308 * most do not. */ 1309 name = get_last_path_component(name); 1310 #endif 1311 /* Count argc for use in a second... */ 1312 for(argc_l=0;*argv_l!=NULL; argv_l++, argc_l++); 1313 optind = 1; 1314 debug_printf("running applet %s\n", name); 1315 run_applet_by_name(name, argc_l, child->argv); 1316 } 1317 #endif 1318 debug_printf("exec of %s\n",child->argv[0]); 1319 execvp(child->argv[0],child->argv); 1320 perror_msg("couldn't exec: %s",child->argv[0]); 1321 _exit(1); 1322 } else if (child->group) { 1323 debug_printf("runtime nesting to group\n"); 1324 interactive=0; /* crucial!!!! */ 1325 rcode = run_list_real(child->group); 1326 /* OK to leak memory by not calling free_pipe_list, 1327 * since this process is about to exit */ 1328 _exit(rcode); 1329 } else { 1330 /* Can happen. See what bash does with ">foo" by itself. */ 1331 debug_printf("trying to pseudo_exec null command\n"); 1332 _exit(EXIT_SUCCESS); 1333 } 1334 } 1335 1336 static void insert_bg_job(struct pipe *pi) 1337 { 1338 struct pipe *thejob; 1339 1340 /* Linear search for the ID of the job to use */ 1341 pi->jobid = 1; 1342 for (thejob = job_list; thejob; thejob = thejob->next) 1343 if (thejob->jobid >= pi->jobid) 1344 pi->jobid = thejob->jobid + 1; 1345 1346 /* add thejob to the list of running jobs */ 1347 if (!job_list) { 1348 thejob = job_list = xmalloc(sizeof(*thejob)); 1349 } else { 1350 for (thejob = job_list; thejob->next; thejob = thejob->next) /* nothing */; 1351 thejob->next = xmalloc(sizeof(*thejob)); 1352 thejob = thejob->next; 1353 } 1354 1355 /* physically copy the struct job */ 1356 memcpy(thejob, pi, sizeof(struct pipe)); 1357 thejob->next = NULL; 1358 thejob->running_progs = thejob->num_progs; 1359 thejob->stopped_progs = 0; 1360 thejob->text = xmalloc(BUFSIZ); /* cmdedit buffer size */ 1361 1362 /*if (pi->progs[0] && pi->progs[0].argv && pi->progs[0].argv[0]) */ 1363 { 1364 char *bar=thejob->text; 1365 char **foo=pi->progs[0].argv; 1366 while(foo && *foo) { 1367 bar += sprintf(bar, "%s ", *foo++); 1368 } 1369 } 1370 1371 /* we don't wait for background thejobs to return -- append it 1372 to the list of backgrounded thejobs and leave it alone */ 1373 printf("[%d] %d\n", thejob->jobid, thejob->progs[0].pid); 1374 last_bg_pid = thejob->progs[0].pid; 1375 last_jobid = thejob->jobid; 1376 } 1377 1378 /* remove a backgrounded job */ 1379 static void remove_bg_job(struct pipe *pi) 1380 { 1381 struct pipe *prev_pipe; 1382 1383 if (pi == job_list) { 1384 job_list = pi->next; 1385 } else { 1386 prev_pipe = job_list; 1387 while (prev_pipe->next != pi) 1388 prev_pipe = prev_pipe->next; 1389 prev_pipe->next = pi->next; 1390 } 1391 if (job_list) 1392 last_jobid = job_list->jobid; 1393 else 1394 last_jobid = 0; 1395 1396 pi->stopped_progs = 0; 1397 free_pipe(pi, 0); 1398 free(pi); 1399 } 1400 1401 /* Checks to see if any processes have exited -- if they 1402 have, figure out why and see if a job has completed */ 1403 static int checkjobs(struct pipe* fg_pipe) 1404 { 1405 int attributes; 1406 int status; 1407 int prognum = 0; 1408 struct pipe *pi; 1409 pid_t childpid; 1410 1411 attributes = WUNTRACED; 1412 if (fg_pipe==NULL) { 1413 attributes |= WNOHANG; 1414 } 1415 1416 while ((childpid = waitpid(-1, &status, attributes)) > 0) { 1417 if (fg_pipe) { 1418 int i, rcode = 0; 1419 for (i=0; i < fg_pipe->num_progs; i++) { 1420 if (fg_pipe->progs[i].pid == childpid) { 1421 if (i==fg_pipe->num_progs-1) 1422 rcode=WEXITSTATUS(status); 1423 (fg_pipe->num_progs)--; 1424 return(rcode); 1425 } 1426 } 1427 } 1428 1429 for (pi = job_list; pi; pi = pi->next) { 1430 prognum = 0; 1431 while (prognum < pi->num_progs && pi->progs[prognum].pid != childpid) { 1432 prognum++; 1433 } 1434 if (prognum < pi->num_progs) 1435 break; 1436 } 1437 1438 if(pi==NULL) { 1439 debug_printf("checkjobs: pid %d was not in our list!\n", childpid); 1440 continue; 1441 } 1442 1443 if (WIFEXITED(status) || WIFSIGNALED(status)) { 1444 /* child exited */ 1445 pi->running_progs--; 1446 pi->progs[prognum].pid = 0; 1447 1448 if (!pi->running_progs) { 1449 printf(JOB_STATUS_FORMAT, pi->jobid, "Done", pi->text); 1450 remove_bg_job(pi); 1451 } 1452 } else { 1453 /* child stopped */ 1454 pi->stopped_progs++; 1455 pi->progs[prognum].is_stopped = 1; 1456 1457 #if 0 1458 /* Printing this stuff is a pain, since it tends to 1459 * overwrite the prompt an inconveinient moments. So 1460 * don't do that. */ 1461 if (pi->stopped_progs == pi->num_progs) { 1462 printf("\n"JOB_STATUS_FORMAT, pi->jobid, "Stopped", pi->text); 1463 } 1464 #endif 1465 } 1466 } 1467 1468 if (childpid == -1 && errno != ECHILD) 1469 perror_msg("waitpid"); 1470 1471 /* move the shell to the foreground */ 1472 /*if (interactive && tcsetpgrp(shell_terminal, getpgid(0))) */ 1473 /* perror_msg("tcsetpgrp-2"); */ 1474 return -1; 1475 } 1476 1477 /* Figure out our controlling tty, checking in order stderr, 1478 * stdin, and stdout. If check_pgrp is set, also check that 1479 * we belong to the foreground process group associated with 1480 * that tty. The value of shell_terminal is needed in order to call 1481 * tcsetpgrp(shell_terminal, ...); */ 1482 void controlling_tty(int check_pgrp) 1483 { 1484 pid_t curpgrp; 1485 1486 if ((curpgrp = tcgetpgrp(shell_terminal = 2)) < 0 1487 && (curpgrp = tcgetpgrp(shell_terminal = 0)) < 0 1488 && (curpgrp = tcgetpgrp(shell_terminal = 1)) < 0) 1489 goto shell_terminal_error; 1490 1491 if (check_pgrp && curpgrp != getpgid(0)) 1492 goto shell_terminal_error; 1493 1494 return; 1495 1496 shell_terminal_error: 1497 shell_terminal = -1; 1498 return; 1499 } 1500 #endif 1501 1502 /* run_pipe_real() starts all the jobs, but doesn't wait for anything 1503 * to finish. See checkjobs(). 1504 * 1505 * return code is normally -1, when the caller has to wait for children 1506 * to finish to determine the exit status of the pipe. If the pipe 1507 * is a simple builtin command, however, the action is done by the 1508 * time run_pipe_real returns, and the exit code is provided as the 1509 * return value. 1510 * 1511 * The input of the pipe is always stdin, the output is always 1512 * stdout. The outpipe[] mechanism in BusyBox-0.48 lash is bogus, 1513 * because it tries to avoid running the command substitution in 1514 * subshell, when that is in fact necessary. The subshell process 1515 * now has its stdout directed to the input of the appropriate pipe, 1516 * so this routine is noticeably simpler. 1517 */ 1518 static int run_pipe_real(struct pipe *pi) 1519 { 1520 int i; 1521 #ifndef __U_BOOT__ 1522 int nextin, nextout; 1523 int pipefds[2]; /* pipefds[0] is for reading */ 1524 struct child_prog *child; 1525 struct built_in_command *x; 1526 char *p; 1527 # if __GNUC__ 1528 /* Avoid longjmp clobbering */ 1529 (void) &i; 1530 (void) &nextin; 1531 (void) &nextout; 1532 (void) &child; 1533 # endif 1534 #else 1535 int nextin; 1536 int flag = do_repeat ? CMD_FLAG_REPEAT : 0; 1537 struct child_prog *child; 1538 char *p; 1539 # if __GNUC__ 1540 /* Avoid longjmp clobbering */ 1541 (void) &i; 1542 (void) &nextin; 1543 (void) &child; 1544 # endif 1545 #endif /* __U_BOOT__ */ 1546 1547 nextin = 0; 1548 #ifndef __U_BOOT__ 1549 pi->pgrp = -1; 1550 #endif 1551 1552 /* Check if this is a simple builtin (not part of a pipe). 1553 * Builtins within pipes have to fork anyway, and are handled in 1554 * pseudo_exec. "echo foo | read bar" doesn't work on bash, either. 1555 */ 1556 if (pi->num_progs == 1) child = & (pi->progs[0]); 1557 #ifndef __U_BOOT__ 1558 if (pi->num_progs == 1 && child->group && child->subshell == 0) { 1559 int squirrel[] = {-1, -1, -1}; 1560 int rcode; 1561 debug_printf("non-subshell grouping\n"); 1562 setup_redirects(child, squirrel); 1563 /* XXX could we merge code with following builtin case, 1564 * by creating a pseudo builtin that calls run_list_real? */ 1565 rcode = run_list_real(child->group); 1566 restore_redirects(squirrel); 1567 #else 1568 if (pi->num_progs == 1 && child->group) { 1569 int rcode; 1570 debug_printf("non-subshell grouping\n"); 1571 rcode = run_list_real(child->group); 1572 #endif 1573 return rcode; 1574 } else if (pi->num_progs == 1 && pi->progs[0].argv != NULL) { 1575 for (i=0; is_assignment(child->argv[i]); i++) { /* nothing */ } 1576 if (i!=0 && child->argv[i]==NULL) { 1577 /* assignments, but no command: set the local environment */ 1578 for (i=0; child->argv[i]!=NULL; i++) { 1579 1580 /* Ok, this case is tricky. We have to decide if this is a 1581 * local variable, or an already exported variable. If it is 1582 * already exported, we have to export the new value. If it is 1583 * not exported, we need only set this as a local variable. 1584 * This junk is all to decide whether or not to export this 1585 * variable. */ 1586 int export_me=0; 1587 char *name, *value; 1588 name = xstrdup(child->argv[i]); 1589 debug_printf("Local environment set: %s\n", name); 1590 value = strchr(name, '='); 1591 if (value) 1592 *value=0; 1593 #ifndef __U_BOOT__ 1594 if ( get_local_var(name)) { 1595 export_me=1; 1596 } 1597 #endif 1598 free(name); 1599 p = insert_var_value(child->argv[i]); 1600 set_local_var(p, export_me); 1601 if (p != child->argv[i]) free(p); 1602 } 1603 return EXIT_SUCCESS; /* don't worry about errors in set_local_var() yet */ 1604 } 1605 for (i = 0; is_assignment(child->argv[i]); i++) { 1606 p = insert_var_value(child->argv[i]); 1607 #ifndef __U_BOOT__ 1608 putenv(strdup(p)); 1609 #else 1610 set_local_var(p, 0); 1611 #endif 1612 if (p != child->argv[i]) { 1613 child->sp--; 1614 free(p); 1615 } 1616 } 1617 if (child->sp) { 1618 char * str = NULL; 1619 1620 str = make_string(child->argv + i, 1621 child->argv_nonnull + i); 1622 parse_string_outer(str, FLAG_EXIT_FROM_LOOP | FLAG_REPARSING); 1623 free(str); 1624 return last_return_code; 1625 } 1626 #ifndef __U_BOOT__ 1627 for (x = bltins; x->cmd; x++) { 1628 if (strcmp(child->argv[i], x->cmd) == 0 ) { 1629 int squirrel[] = {-1, -1, -1}; 1630 int rcode; 1631 if (x->function == builtin_exec && child->argv[i+1]==NULL) { 1632 debug_printf("magic exec\n"); 1633 setup_redirects(child,NULL); 1634 return EXIT_SUCCESS; 1635 } 1636 debug_printf("builtin inline %s\n", child->argv[0]); 1637 /* XXX setup_redirects acts on file descriptors, not FILEs. 1638 * This is perfect for work that comes after exec(). 1639 * Is it really safe for inline use? Experimentally, 1640 * things seem to work with glibc. */ 1641 setup_redirects(child, squirrel); 1642 1643 child->argv += i; /* XXX horrible hack */ 1644 rcode = x->function(child); 1645 /* XXX restore hack so free() can work right */ 1646 child->argv -= i; 1647 restore_redirects(squirrel); 1648 } 1649 return rcode; 1650 } 1651 #else 1652 /* check ";", because ,example , argv consist from 1653 * "help;flinfo" must not execute 1654 */ 1655 if (strchr(child->argv[i], ';')) { 1656 printf("Unknown command '%s' - try 'help' or use " 1657 "'run' command\n", child->argv[i]); 1658 return -1; 1659 } 1660 /* Process the command */ 1661 return cmd_process(flag, child->argc, child->argv, 1662 &flag_repeat, NULL); 1663 #endif 1664 } 1665 #ifndef __U_BOOT__ 1666 1667 for (i = 0; i < pi->num_progs; i++) { 1668 child = & (pi->progs[i]); 1669 1670 /* pipes are inserted between pairs of commands */ 1671 if ((i + 1) < pi->num_progs) { 1672 if (pipe(pipefds)<0) perror_msg_and_die("pipe"); 1673 nextout = pipefds[1]; 1674 } else { 1675 nextout=1; 1676 pipefds[0] = -1; 1677 } 1678 1679 /* XXX test for failed fork()? */ 1680 if (!(child->pid = fork())) { 1681 /* Set the handling for job control signals back to the default. */ 1682 signal(SIGINT, SIG_DFL); 1683 signal(SIGQUIT, SIG_DFL); 1684 signal(SIGTERM, SIG_DFL); 1685 signal(SIGTSTP, SIG_DFL); 1686 signal(SIGTTIN, SIG_DFL); 1687 signal(SIGTTOU, SIG_DFL); 1688 signal(SIGCHLD, SIG_DFL); 1689 1690 close_all(); 1691 1692 if (nextin != 0) { 1693 dup2(nextin, 0); 1694 close(nextin); 1695 } 1696 if (nextout != 1) { 1697 dup2(nextout, 1); 1698 close(nextout); 1699 } 1700 if (pipefds[0]!=-1) { 1701 close(pipefds[0]); /* opposite end of our output pipe */ 1702 } 1703 1704 /* Like bash, explicit redirects override pipes, 1705 * and the pipe fd is available for dup'ing. */ 1706 setup_redirects(child,NULL); 1707 1708 if (interactive && pi->followup!=PIPE_BG) { 1709 /* If we (the child) win the race, put ourselves in the process 1710 * group whose leader is the first process in this pipe. */ 1711 if (pi->pgrp < 0) { 1712 pi->pgrp = getpid(); 1713 } 1714 if (setpgid(0, pi->pgrp) == 0) { 1715 tcsetpgrp(2, pi->pgrp); 1716 } 1717 } 1718 1719 pseudo_exec(child); 1720 } 1721 1722 1723 /* put our child in the process group whose leader is the 1724 first process in this pipe */ 1725 if (pi->pgrp < 0) { 1726 pi->pgrp = child->pid; 1727 } 1728 /* Don't check for errors. The child may be dead already, 1729 * in which case setpgid returns error code EACCES. */ 1730 setpgid(child->pid, pi->pgrp); 1731 1732 if (nextin != 0) 1733 close(nextin); 1734 if (nextout != 1) 1735 close(nextout); 1736 1737 /* If there isn't another process, nextin is garbage 1738 but it doesn't matter */ 1739 nextin = pipefds[0]; 1740 } 1741 #endif 1742 return -1; 1743 } 1744 1745 static int run_list_real(struct pipe *pi) 1746 { 1747 char *save_name = NULL; 1748 char **list = NULL; 1749 char **save_list = NULL; 1750 struct pipe *rpipe; 1751 int flag_rep = 0; 1752 #ifndef __U_BOOT__ 1753 int save_num_progs; 1754 #endif 1755 int rcode=0, flag_skip=1; 1756 int flag_restore = 0; 1757 int if_code=0, next_if_code=0; /* need double-buffer to handle elif */ 1758 reserved_style rmode, skip_more_in_this_rmode=RES_XXXX; 1759 /* check syntax for "for" */ 1760 for (rpipe = pi; rpipe; rpipe = rpipe->next) { 1761 if ((rpipe->r_mode == RES_IN || 1762 rpipe->r_mode == RES_FOR) && 1763 (rpipe->next == NULL)) { 1764 syntax(); 1765 #ifdef __U_BOOT__ 1766 flag_repeat = 0; 1767 #endif 1768 return 1; 1769 } 1770 if ((rpipe->r_mode == RES_IN && 1771 (rpipe->next->r_mode == RES_IN && 1772 rpipe->next->progs->argv != NULL))|| 1773 (rpipe->r_mode == RES_FOR && 1774 rpipe->next->r_mode != RES_IN)) { 1775 syntax(); 1776 #ifdef __U_BOOT__ 1777 flag_repeat = 0; 1778 #endif 1779 return 1; 1780 } 1781 } 1782 for (; pi; pi = (flag_restore != 0) ? rpipe : pi->next) { 1783 if (pi->r_mode == RES_WHILE || pi->r_mode == RES_UNTIL || 1784 pi->r_mode == RES_FOR) { 1785 #ifdef __U_BOOT__ 1786 /* check Ctrl-C */ 1787 ctrlc(); 1788 if ((had_ctrlc())) { 1789 return 1; 1790 } 1791 #endif 1792 flag_restore = 0; 1793 if (!rpipe) { 1794 flag_rep = 0; 1795 rpipe = pi; 1796 } 1797 } 1798 rmode = pi->r_mode; 1799 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); 1800 if (rmode == skip_more_in_this_rmode && flag_skip) { 1801 if (pi->followup == PIPE_SEQ) flag_skip=0; 1802 continue; 1803 } 1804 flag_skip = 1; 1805 skip_more_in_this_rmode = RES_XXXX; 1806 if (rmode == RES_THEN || rmode == RES_ELSE) if_code = next_if_code; 1807 if (rmode == RES_THEN && if_code) continue; 1808 if (rmode == RES_ELSE && !if_code) continue; 1809 if (rmode == RES_ELIF && !if_code) break; 1810 if (rmode == RES_FOR && pi->num_progs) { 1811 if (!list) { 1812 /* if no variable values after "in" we skip "for" */ 1813 if (!pi->next->progs->argv) continue; 1814 /* create list of variable values */ 1815 list = make_list_in(pi->next->progs->argv, 1816 pi->progs->argv[0]); 1817 save_list = list; 1818 save_name = pi->progs->argv[0]; 1819 pi->progs->argv[0] = NULL; 1820 flag_rep = 1; 1821 } 1822 if (!(*list)) { 1823 free(pi->progs->argv[0]); 1824 free(save_list); 1825 list = NULL; 1826 flag_rep = 0; 1827 pi->progs->argv[0] = save_name; 1828 #ifndef __U_BOOT__ 1829 pi->progs->glob_result.gl_pathv[0] = 1830 pi->progs->argv[0]; 1831 #endif 1832 continue; 1833 } else { 1834 /* insert new value from list for variable */ 1835 if (pi->progs->argv[0]) 1836 free(pi->progs->argv[0]); 1837 pi->progs->argv[0] = *list++; 1838 #ifndef __U_BOOT__ 1839 pi->progs->glob_result.gl_pathv[0] = 1840 pi->progs->argv[0]; 1841 #endif 1842 } 1843 } 1844 if (rmode == RES_IN) continue; 1845 if (rmode == RES_DO) { 1846 if (!flag_rep) continue; 1847 } 1848 if ((rmode == RES_DONE)) { 1849 if (flag_rep) { 1850 flag_restore = 1; 1851 } else { 1852 rpipe = NULL; 1853 } 1854 } 1855 if (pi->num_progs == 0) continue; 1856 #ifndef __U_BOOT__ 1857 save_num_progs = pi->num_progs; /* save number of programs */ 1858 #endif 1859 rcode = run_pipe_real(pi); 1860 debug_printf("run_pipe_real returned %d\n",rcode); 1861 #ifndef __U_BOOT__ 1862 if (rcode!=-1) { 1863 /* We only ran a builtin: rcode was set by the return value 1864 * of run_pipe_real(), and we don't need to wait for anything. */ 1865 } else if (pi->followup==PIPE_BG) { 1866 /* XXX check bash's behavior with nontrivial pipes */ 1867 /* XXX compute jobid */ 1868 /* XXX what does bash do with attempts to background builtins? */ 1869 insert_bg_job(pi); 1870 rcode = EXIT_SUCCESS; 1871 } else { 1872 if (interactive) { 1873 /* move the new process group into the foreground */ 1874 if (tcsetpgrp(shell_terminal, pi->pgrp) && errno != ENOTTY) 1875 perror_msg("tcsetpgrp-3"); 1876 rcode = checkjobs(pi); 1877 /* move the shell to the foreground */ 1878 if (tcsetpgrp(shell_terminal, getpgid(0)) && errno != ENOTTY) 1879 perror_msg("tcsetpgrp-4"); 1880 } else { 1881 rcode = checkjobs(pi); 1882 } 1883 debug_printf("checkjobs returned %d\n",rcode); 1884 } 1885 last_return_code=rcode; 1886 #else 1887 if (rcode < -1) { 1888 last_return_code = -rcode - 2; 1889 return -2; /* exit */ 1890 } 1891 last_return_code=(rcode == 0) ? 0 : 1; 1892 #endif 1893 #ifndef __U_BOOT__ 1894 pi->num_progs = save_num_progs; /* restore number of programs */ 1895 #endif 1896 if ( rmode == RES_IF || rmode == RES_ELIF ) 1897 next_if_code=rcode; /* can be overwritten a number of times */ 1898 if (rmode == RES_WHILE) 1899 flag_rep = !last_return_code; 1900 if (rmode == RES_UNTIL) 1901 flag_rep = last_return_code; 1902 if ( (rcode==EXIT_SUCCESS && pi->followup==PIPE_OR) || 1903 (rcode!=EXIT_SUCCESS && pi->followup==PIPE_AND) ) 1904 skip_more_in_this_rmode=rmode; 1905 #ifndef __U_BOOT__ 1906 checkjobs(NULL); 1907 #endif 1908 } 1909 return rcode; 1910 } 1911 1912 /* broken, of course, but OK for testing */ 1913 static char *indenter(int i) 1914 { 1915 static char blanks[]=" "; 1916 return &blanks[sizeof(blanks)-i-1]; 1917 } 1918 1919 /* return code is the exit status of the pipe */ 1920 static int free_pipe(struct pipe *pi, int indent) 1921 { 1922 char **p; 1923 struct child_prog *child; 1924 #ifndef __U_BOOT__ 1925 struct redir_struct *r, *rnext; 1926 #endif 1927 int a, i, ret_code=0; 1928 char *ind = indenter(indent); 1929 1930 #ifndef __U_BOOT__ 1931 if (pi->stopped_progs > 0) 1932 return ret_code; 1933 final_printf("%s run pipe: (pid %d)\n",ind,getpid()); 1934 #endif 1935 for (i=0; i<pi->num_progs; i++) { 1936 child = &pi->progs[i]; 1937 final_printf("%s command %d:\n",ind,i); 1938 if (child->argv) { 1939 for (a=0,p=child->argv; *p; a++,p++) { 1940 final_printf("%s argv[%d] = %s\n",ind,a,*p); 1941 } 1942 #ifndef __U_BOOT__ 1943 globfree(&child->glob_result); 1944 #else 1945 for (a = 0; a < child->argc; a++) { 1946 free(child->argv[a]); 1947 } 1948 free(child->argv); 1949 free(child->argv_nonnull); 1950 child->argc = 0; 1951 #endif 1952 child->argv=NULL; 1953 } else if (child->group) { 1954 #ifndef __U_BOOT__ 1955 final_printf("%s begin group (subshell:%d)\n",ind, child->subshell); 1956 #endif 1957 ret_code = free_pipe_list(child->group,indent+3); 1958 final_printf("%s end group\n",ind); 1959 } else { 1960 final_printf("%s (nil)\n",ind); 1961 } 1962 #ifndef __U_BOOT__ 1963 for (r=child->redirects; r; r=rnext) { 1964 final_printf("%s redirect %d%s", ind, r->fd, redir_table[r->type].descrip); 1965 if (r->dup == -1) { 1966 /* guard against the case >$FOO, where foo is unset or blank */ 1967 if (r->word.gl_pathv) { 1968 final_printf(" %s\n", *r->word.gl_pathv); 1969 globfree(&r->word); 1970 } 1971 } else { 1972 final_printf("&%d\n", r->dup); 1973 } 1974 rnext=r->next; 1975 free(r); 1976 } 1977 child->redirects=NULL; 1978 #endif 1979 } 1980 free(pi->progs); /* children are an array, they get freed all at once */ 1981 pi->progs=NULL; 1982 return ret_code; 1983 } 1984 1985 static int free_pipe_list(struct pipe *head, int indent) 1986 { 1987 int rcode=0; /* if list has no members */ 1988 struct pipe *pi, *next; 1989 char *ind = indenter(indent); 1990 for (pi=head; pi; pi=next) { 1991 final_printf("%s pipe reserved mode %d\n", ind, pi->r_mode); 1992 rcode = free_pipe(pi, indent); 1993 final_printf("%s pipe followup code %d\n", ind, pi->followup); 1994 next=pi->next; 1995 pi->next=NULL; 1996 free(pi); 1997 } 1998 return rcode; 1999 } 2000 2001 /* Select which version we will use */ 2002 static int run_list(struct pipe *pi) 2003 { 2004 int rcode=0; 2005 #ifndef __U_BOOT__ 2006 if (fake_mode==0) { 2007 #endif 2008 rcode = run_list_real(pi); 2009 #ifndef __U_BOOT__ 2010 } 2011 #endif 2012 /* free_pipe_list has the side effect of clearing memory 2013 * In the long run that function can be merged with run_list_real, 2014 * but doing that now would hobble the debugging effort. */ 2015 free_pipe_list(pi,0); 2016 return rcode; 2017 } 2018 2019 /* The API for glob is arguably broken. This routine pushes a non-matching 2020 * string into the output structure, removing non-backslashed backslashes. 2021 * If someone can prove me wrong, by performing this function within the 2022 * original glob(3) api, feel free to rewrite this routine into oblivion. 2023 * Return code (0 vs. GLOB_NOSPACE) matches glob(3). 2024 * XXX broken if the last character is '\\', check that before calling. 2025 */ 2026 #ifndef __U_BOOT__ 2027 static int globhack(const char *src, int flags, glob_t *pglob) 2028 { 2029 int cnt=0, pathc; 2030 const char *s; 2031 char *dest; 2032 for (cnt=1, s=src; s && *s; s++) { 2033 if (*s == '\\') s++; 2034 cnt++; 2035 } 2036 dest = malloc(cnt); 2037 if (!dest) return GLOB_NOSPACE; 2038 if (!(flags & GLOB_APPEND)) { 2039 pglob->gl_pathv=NULL; 2040 pglob->gl_pathc=0; 2041 pglob->gl_offs=0; 2042 pglob->gl_offs=0; 2043 } 2044 pathc = ++pglob->gl_pathc; 2045 pglob->gl_pathv = realloc(pglob->gl_pathv, (pathc+1)*sizeof(*pglob->gl_pathv)); 2046 if (pglob->gl_pathv == NULL) return GLOB_NOSPACE; 2047 pglob->gl_pathv[pathc-1]=dest; 2048 pglob->gl_pathv[pathc]=NULL; 2049 for (s=src; s && *s; s++, dest++) { 2050 if (*s == '\\') s++; 2051 *dest = *s; 2052 } 2053 *dest='\0'; 2054 return 0; 2055 } 2056 2057 /* XXX broken if the last character is '\\', check that before calling */ 2058 static int glob_needed(const char *s) 2059 { 2060 for (; *s; s++) { 2061 if (*s == '\\') s++; 2062 if (strchr("*[?",*s)) return 1; 2063 } 2064 return 0; 2065 } 2066 2067 #if 0 2068 static void globprint(glob_t *pglob) 2069 { 2070 int i; 2071 debug_printf("glob_t at %p:\n", pglob); 2072 debug_printf(" gl_pathc=%d gl_pathv=%p gl_offs=%d gl_flags=%d\n", 2073 pglob->gl_pathc, pglob->gl_pathv, pglob->gl_offs, pglob->gl_flags); 2074 for (i=0; i<pglob->gl_pathc; i++) 2075 debug_printf("pglob->gl_pathv[%d] = %p = %s\n", i, 2076 pglob->gl_pathv[i], pglob->gl_pathv[i]); 2077 } 2078 #endif 2079 2080 static int xglob(o_string *dest, int flags, glob_t *pglob) 2081 { 2082 int gr; 2083 2084 /* short-circuit for null word */ 2085 /* we can code this better when the debug_printf's are gone */ 2086 if (dest->length == 0) { 2087 if (dest->nonnull) { 2088 /* bash man page calls this an "explicit" null */ 2089 gr = globhack(dest->data, flags, pglob); 2090 debug_printf("globhack returned %d\n",gr); 2091 } else { 2092 return 0; 2093 } 2094 } else if (glob_needed(dest->data)) { 2095 gr = glob(dest->data, flags, NULL, pglob); 2096 debug_printf("glob returned %d\n",gr); 2097 if (gr == GLOB_NOMATCH) { 2098 /* quote removal, or more accurately, backslash removal */ 2099 gr = globhack(dest->data, flags, pglob); 2100 debug_printf("globhack returned %d\n",gr); 2101 } 2102 } else { 2103 gr = globhack(dest->data, flags, pglob); 2104 debug_printf("globhack returned %d\n",gr); 2105 } 2106 if (gr == GLOB_NOSPACE) 2107 error_msg_and_die("out of memory during glob"); 2108 if (gr != 0) { /* GLOB_ABORTED ? */ 2109 error_msg("glob(3) error %d",gr); 2110 } 2111 /* globprint(glob_target); */ 2112 return gr; 2113 } 2114 #endif 2115 2116 #ifdef __U_BOOT__ 2117 static char *get_dollar_var(char ch); 2118 #endif 2119 2120 /* This is used to get/check local shell variables */ 2121 char *get_local_var(const char *s) 2122 { 2123 struct variables *cur; 2124 2125 if (!s) 2126 return NULL; 2127 2128 #ifdef __U_BOOT__ 2129 if (*s == '$') 2130 return get_dollar_var(s[1]); 2131 #endif 2132 2133 for (cur = top_vars; cur; cur=cur->next) 2134 if(strcmp(cur->name, s)==0) 2135 return cur->value; 2136 return NULL; 2137 } 2138 2139 /* This is used to set local shell variables 2140 flg_export==0 if only local (not exporting) variable 2141 flg_export==1 if "new" exporting environ 2142 flg_export>1 if current startup environ (not call putenv()) */ 2143 int set_local_var(const char *s, int flg_export) 2144 { 2145 char *name, *value; 2146 int result=0; 2147 struct variables *cur; 2148 2149 #ifdef __U_BOOT__ 2150 /* might be possible! */ 2151 if (!isalpha(*s)) 2152 return -1; 2153 #endif 2154 2155 name=strdup(s); 2156 2157 #ifdef __U_BOOT__ 2158 if (getenv(name) != NULL) { 2159 printf ("ERROR: " 2160 "There is a global environment variable with the same name.\n"); 2161 free(name); 2162 return -1; 2163 } 2164 #endif 2165 /* Assume when we enter this function that we are already in 2166 * NAME=VALUE format. So the first order of business is to 2167 * split 's' on the '=' into 'name' and 'value' */ 2168 value = strchr(name, '='); 2169 if (value == NULL && ++value == NULL) { 2170 free(name); 2171 return -1; 2172 } 2173 *value++ = 0; 2174 2175 for(cur = top_vars; cur; cur = cur->next) { 2176 if(strcmp(cur->name, name)==0) 2177 break; 2178 } 2179 2180 if(cur) { 2181 if(strcmp(cur->value, value)==0) { 2182 if(flg_export>0 && cur->flg_export==0) 2183 cur->flg_export=flg_export; 2184 else 2185 result++; 2186 } else { 2187 if(cur->flg_read_only) { 2188 error_msg("%s: readonly variable", name); 2189 result = -1; 2190 } else { 2191 if(flg_export>0 || cur->flg_export>1) 2192 cur->flg_export=1; 2193 free(cur->value); 2194 2195 cur->value = strdup(value); 2196 } 2197 } 2198 } else { 2199 cur = malloc(sizeof(struct variables)); 2200 if(!cur) { 2201 result = -1; 2202 } else { 2203 cur->name = strdup(name); 2204 if (cur->name == NULL) { 2205 free(cur); 2206 result = -1; 2207 } else { 2208 struct variables *bottom = top_vars; 2209 cur->value = strdup(value); 2210 cur->next = NULL; 2211 cur->flg_export = flg_export; 2212 cur->flg_read_only = 0; 2213 while(bottom->next) bottom=bottom->next; 2214 bottom->next = cur; 2215 } 2216 } 2217 } 2218 2219 #ifndef __U_BOOT__ 2220 if(result==0 && cur->flg_export==1) { 2221 *(value-1) = '='; 2222 result = putenv(name); 2223 } else { 2224 #endif 2225 free(name); 2226 #ifndef __U_BOOT__ 2227 if(result>0) /* equivalent to previous set */ 2228 result = 0; 2229 } 2230 #endif 2231 return result; 2232 } 2233 2234 void unset_local_var(const char *name) 2235 { 2236 struct variables *cur; 2237 2238 if (name) { 2239 for (cur = top_vars; cur; cur=cur->next) { 2240 if(strcmp(cur->name, name)==0) 2241 break; 2242 } 2243 if (cur != NULL) { 2244 struct variables *next = top_vars; 2245 if(cur->flg_read_only) { 2246 error_msg("%s: readonly variable", name); 2247 return; 2248 } else { 2249 #ifndef __U_BOOT__ 2250 if(cur->flg_export) 2251 unsetenv(cur->name); 2252 #endif 2253 free(cur->name); 2254 free(cur->value); 2255 while (next->next != cur) 2256 next = next->next; 2257 next->next = cur->next; 2258 } 2259 free(cur); 2260 } 2261 } 2262 } 2263 2264 static int is_assignment(const char *s) 2265 { 2266 if (s == NULL) 2267 return 0; 2268 2269 if (!isalpha(*s)) return 0; 2270 ++s; 2271 while(isalnum(*s) || *s=='_') ++s; 2272 return *s=='='; 2273 } 2274 2275 #ifndef __U_BOOT__ 2276 /* the src parameter allows us to peek forward to a possible &n syntax 2277 * for file descriptor duplication, e.g., "2>&1". 2278 * Return code is 0 normally, 1 if a syntax error is detected in src. 2279 * Resource errors (in xmalloc) cause the process to exit */ 2280 static int setup_redirect(struct p_context *ctx, int fd, redir_type style, 2281 struct in_str *input) 2282 { 2283 struct child_prog *child=ctx->child; 2284 struct redir_struct *redir = child->redirects; 2285 struct redir_struct *last_redir=NULL; 2286 2287 /* Create a new redir_struct and drop it onto the end of the linked list */ 2288 while(redir) { 2289 last_redir=redir; 2290 redir=redir->next; 2291 } 2292 redir = xmalloc(sizeof(struct redir_struct)); 2293 redir->next=NULL; 2294 redir->word.gl_pathv=NULL; 2295 if (last_redir) { 2296 last_redir->next=redir; 2297 } else { 2298 child->redirects=redir; 2299 } 2300 2301 redir->type=style; 2302 redir->fd= (fd==-1) ? redir_table[style].default_fd : fd ; 2303 2304 debug_printf("Redirect type %d%s\n", redir->fd, redir_table[style].descrip); 2305 2306 /* Check for a '2>&1' type redirect */ 2307 redir->dup = redirect_dup_num(input); 2308 if (redir->dup == -2) return 1; /* syntax error */ 2309 if (redir->dup != -1) { 2310 /* Erik had a check here that the file descriptor in question 2311 * is legit; I postpone that to "run time" 2312 * A "-" representation of "close me" shows up as a -3 here */ 2313 debug_printf("Duplicating redirect '%d>&%d'\n", redir->fd, redir->dup); 2314 } else { 2315 /* We do _not_ try to open the file that src points to, 2316 * since we need to return and let src be expanded first. 2317 * Set ctx->pending_redirect, so we know what to do at the 2318 * end of the next parsed word. 2319 */ 2320 ctx->pending_redirect = redir; 2321 } 2322 return 0; 2323 } 2324 #endif 2325 2326 static struct pipe *new_pipe(void) 2327 { 2328 struct pipe *pi; 2329 pi = xmalloc(sizeof(struct pipe)); 2330 pi->num_progs = 0; 2331 pi->progs = NULL; 2332 pi->next = NULL; 2333 pi->followup = 0; /* invalid */ 2334 pi->r_mode = RES_NONE; 2335 return pi; 2336 } 2337 2338 static void initialize_context(struct p_context *ctx) 2339 { 2340 ctx->pipe=NULL; 2341 #ifndef __U_BOOT__ 2342 ctx->pending_redirect=NULL; 2343 #endif 2344 ctx->child=NULL; 2345 ctx->list_head=new_pipe(); 2346 ctx->pipe=ctx->list_head; 2347 ctx->w=RES_NONE; 2348 ctx->stack=NULL; 2349 #ifdef __U_BOOT__ 2350 ctx->old_flag=0; 2351 #endif 2352 done_command(ctx); /* creates the memory for working child */ 2353 } 2354 2355 /* normal return is 0 2356 * if a reserved word is found, and processed, return 1 2357 * should handle if, then, elif, else, fi, for, while, until, do, done. 2358 * case, function, and select are obnoxious, save those for later. 2359 */ 2360 struct reserved_combo { 2361 char *literal; 2362 int code; 2363 long flag; 2364 }; 2365 /* Mostly a list of accepted follow-up reserved words. 2366 * FLAG_END means we are done with the sequence, and are ready 2367 * to turn the compound list into a command. 2368 * FLAG_START means the word must start a new compound list. 2369 */ 2370 static struct reserved_combo reserved_list[] = { 2371 { "if", RES_IF, FLAG_THEN | FLAG_START }, 2372 { "then", RES_THEN, FLAG_ELIF | FLAG_ELSE | FLAG_FI }, 2373 { "elif", RES_ELIF, FLAG_THEN }, 2374 { "else", RES_ELSE, FLAG_FI }, 2375 { "fi", RES_FI, FLAG_END }, 2376 { "for", RES_FOR, FLAG_IN | FLAG_START }, 2377 { "while", RES_WHILE, FLAG_DO | FLAG_START }, 2378 { "until", RES_UNTIL, FLAG_DO | FLAG_START }, 2379 { "in", RES_IN, FLAG_DO }, 2380 { "do", RES_DO, FLAG_DONE }, 2381 { "done", RES_DONE, FLAG_END } 2382 }; 2383 #define NRES (sizeof(reserved_list)/sizeof(struct reserved_combo)) 2384 2385 static int reserved_word(o_string *dest, struct p_context *ctx) 2386 { 2387 struct reserved_combo *r; 2388 for (r=reserved_list; 2389 r<reserved_list+NRES; r++) { 2390 if (strcmp(dest->data, r->literal) == 0) { 2391 debug_printf("found reserved word %s, code %d\n",r->literal,r->code); 2392 if (r->flag & FLAG_START) { 2393 struct p_context *new = xmalloc(sizeof(struct p_context)); 2394 debug_printf("push stack\n"); 2395 if (ctx->w == RES_IN || ctx->w == RES_FOR) { 2396 syntax(); 2397 free(new); 2398 ctx->w = RES_SNTX; 2399 b_reset(dest); 2400 return 1; 2401 } 2402 *new = *ctx; /* physical copy */ 2403 initialize_context(ctx); 2404 ctx->stack=new; 2405 } else if ( ctx->w == RES_NONE || ! (ctx->old_flag & (1<<r->code))) { 2406 syntax(); 2407 ctx->w = RES_SNTX; 2408 b_reset(dest); 2409 return 1; 2410 } 2411 ctx->w=r->code; 2412 ctx->old_flag = r->flag; 2413 if (ctx->old_flag & FLAG_END) { 2414 struct p_context *old; 2415 debug_printf("pop stack\n"); 2416 done_pipe(ctx,PIPE_SEQ); 2417 old = ctx->stack; 2418 old->child->group = ctx->list_head; 2419 #ifndef __U_BOOT__ 2420 old->child->subshell = 0; 2421 #endif 2422 *ctx = *old; /* physical copy */ 2423 free(old); 2424 } 2425 b_reset (dest); 2426 return 1; 2427 } 2428 } 2429 return 0; 2430 } 2431 2432 /* normal return is 0. 2433 * Syntax or xglob errors return 1. */ 2434 static int done_word(o_string *dest, struct p_context *ctx) 2435 { 2436 struct child_prog *child=ctx->child; 2437 #ifndef __U_BOOT__ 2438 glob_t *glob_target; 2439 int gr, flags = 0; 2440 #else 2441 char *str, *s; 2442 int argc, cnt; 2443 #endif 2444 2445 debug_printf("done_word: %s %p\n", dest->data, child); 2446 if (dest->length == 0 && !dest->nonnull) { 2447 debug_printf(" true null, ignored\n"); 2448 return 0; 2449 } 2450 #ifndef __U_BOOT__ 2451 if (ctx->pending_redirect) { 2452 glob_target = &ctx->pending_redirect->word; 2453 } else { 2454 #endif 2455 if (child->group) { 2456 syntax(); 2457 return 1; /* syntax error, groups and arglists don't mix */ 2458 } 2459 if (!child->argv && (ctx->type & FLAG_PARSE_SEMICOLON)) { 2460 debug_printf("checking %s for reserved-ness\n",dest->data); 2461 if (reserved_word(dest,ctx)) return ctx->w==RES_SNTX; 2462 } 2463 #ifndef __U_BOOT__ 2464 glob_target = &child->glob_result; 2465 if (child->argv) flags |= GLOB_APPEND; 2466 #else 2467 for (cnt = 1, s = dest->data; s && *s; s++) { 2468 if (*s == '\\') s++; 2469 cnt++; 2470 } 2471 str = malloc(cnt); 2472 if (!str) return 1; 2473 if ( child->argv == NULL) { 2474 child->argc=0; 2475 } 2476 argc = ++child->argc; 2477 child->argv = realloc(child->argv, (argc+1)*sizeof(*child->argv)); 2478 if (child->argv == NULL) return 1; 2479 child->argv_nonnull = realloc(child->argv_nonnull, 2480 (argc+1)*sizeof(*child->argv_nonnull)); 2481 if (child->argv_nonnull == NULL) 2482 return 1; 2483 child->argv[argc-1]=str; 2484 child->argv_nonnull[argc-1] = dest->nonnull; 2485 child->argv[argc]=NULL; 2486 child->argv_nonnull[argc] = 0; 2487 for (s = dest->data; s && *s; s++,str++) { 2488 if (*s == '\\') s++; 2489 *str = *s; 2490 } 2491 *str = '\0'; 2492 #endif 2493 #ifndef __U_BOOT__ 2494 } 2495 gr = xglob(dest, flags, glob_target); 2496 if (gr != 0) return 1; 2497 #endif 2498 2499 b_reset(dest); 2500 #ifndef __U_BOOT__ 2501 if (ctx->pending_redirect) { 2502 ctx->pending_redirect=NULL; 2503 if (glob_target->gl_pathc != 1) { 2504 error_msg("ambiguous redirect"); 2505 return 1; 2506 } 2507 } else { 2508 child->argv = glob_target->gl_pathv; 2509 } 2510 #endif 2511 if (ctx->w == RES_FOR) { 2512 done_word(dest,ctx); 2513 done_pipe(ctx,PIPE_SEQ); 2514 } 2515 return 0; 2516 } 2517 2518 /* The only possible error here is out of memory, in which case 2519 * xmalloc exits. */ 2520 static int done_command(struct p_context *ctx) 2521 { 2522 /* The child is really already in the pipe structure, so 2523 * advance the pipe counter and make a new, null child. 2524 * Only real trickiness here is that the uncommitted 2525 * child structure, to which ctx->child points, is not 2526 * counted in pi->num_progs. */ 2527 struct pipe *pi=ctx->pipe; 2528 struct child_prog *prog=ctx->child; 2529 2530 if (prog && prog->group == NULL 2531 && prog->argv == NULL 2532 #ifndef __U_BOOT__ 2533 && prog->redirects == NULL) { 2534 #else 2535 ) { 2536 #endif 2537 debug_printf("done_command: skipping null command\n"); 2538 return 0; 2539 } else if (prog) { 2540 pi->num_progs++; 2541 debug_printf("done_command: num_progs incremented to %d\n",pi->num_progs); 2542 } else { 2543 debug_printf("done_command: initializing\n"); 2544 } 2545 pi->progs = xrealloc(pi->progs, sizeof(*pi->progs) * (pi->num_progs+1)); 2546 2547 prog = pi->progs + pi->num_progs; 2548 #ifndef __U_BOOT__ 2549 prog->redirects = NULL; 2550 #endif 2551 prog->argv = NULL; 2552 prog->argv_nonnull = NULL; 2553 #ifndef __U_BOOT__ 2554 prog->is_stopped = 0; 2555 #endif 2556 prog->group = NULL; 2557 #ifndef __U_BOOT__ 2558 prog->glob_result.gl_pathv = NULL; 2559 prog->family = pi; 2560 #endif 2561 prog->sp = 0; 2562 ctx->child = prog; 2563 prog->type = ctx->type; 2564 2565 /* but ctx->pipe and ctx->list_head remain unchanged */ 2566 return 0; 2567 } 2568 2569 static int done_pipe(struct p_context *ctx, pipe_style type) 2570 { 2571 struct pipe *new_p; 2572 done_command(ctx); /* implicit closure of previous command */ 2573 debug_printf("done_pipe, type %d\n", type); 2574 ctx->pipe->followup = type; 2575 ctx->pipe->r_mode = ctx->w; 2576 new_p=new_pipe(); 2577 ctx->pipe->next = new_p; 2578 ctx->pipe = new_p; 2579 ctx->child = NULL; 2580 done_command(ctx); /* set up new pipe to accept commands */ 2581 return 0; 2582 } 2583 2584 #ifndef __U_BOOT__ 2585 /* peek ahead in the in_str to find out if we have a "&n" construct, 2586 * as in "2>&1", that represents duplicating a file descriptor. 2587 * returns either -2 (syntax error), -1 (no &), or the number found. 2588 */ 2589 static int redirect_dup_num(struct in_str *input) 2590 { 2591 int ch, d=0, ok=0; 2592 ch = b_peek(input); 2593 if (ch != '&') return -1; 2594 2595 b_getch(input); /* get the & */ 2596 ch=b_peek(input); 2597 if (ch == '-') { 2598 b_getch(input); 2599 return -3; /* "-" represents "close me" */ 2600 } 2601 while (isdigit(ch)) { 2602 d = d*10+(ch-'0'); 2603 ok=1; 2604 b_getch(input); 2605 ch = b_peek(input); 2606 } 2607 if (ok) return d; 2608 2609 error_msg("ambiguous redirect"); 2610 return -2; 2611 } 2612 2613 /* If a redirect is immediately preceded by a number, that number is 2614 * supposed to tell which file descriptor to redirect. This routine 2615 * looks for such preceding numbers. In an ideal world this routine 2616 * needs to handle all the following classes of redirects... 2617 * echo 2>foo # redirects fd 2 to file "foo", nothing passed to echo 2618 * echo 49>foo # redirects fd 49 to file "foo", nothing passed to echo 2619 * echo -2>foo # redirects fd 1 to file "foo", "-2" passed to echo 2620 * echo 49x>foo # redirects fd 1 to file "foo", "49x" passed to echo 2621 * A -1 output from this program means no valid number was found, so the 2622 * caller should use the appropriate default for this redirection. 2623 */ 2624 static int redirect_opt_num(o_string *o) 2625 { 2626 int num; 2627 2628 if (o->length==0) return -1; 2629 for(num=0; num<o->length; num++) { 2630 if (!isdigit(*(o->data+num))) { 2631 return -1; 2632 } 2633 } 2634 /* reuse num (and save an int) */ 2635 num=atoi(o->data); 2636 b_reset(o); 2637 return num; 2638 } 2639 2640 FILE *generate_stream_from_list(struct pipe *head) 2641 { 2642 FILE *pf; 2643 #if 1 2644 int pid, channel[2]; 2645 if (pipe(channel)<0) perror_msg_and_die("pipe"); 2646 pid=fork(); 2647 if (pid<0) { 2648 perror_msg_and_die("fork"); 2649 } else if (pid==0) { 2650 close(channel[0]); 2651 if (channel[1] != 1) { 2652 dup2(channel[1],1); 2653 close(channel[1]); 2654 } 2655 #if 0 2656 #define SURROGATE "surrogate response" 2657 write(1,SURROGATE,sizeof(SURROGATE)); 2658 _exit(run_list(head)); 2659 #else 2660 _exit(run_list_real(head)); /* leaks memory */ 2661 #endif 2662 } 2663 debug_printf("forked child %d\n",pid); 2664 close(channel[1]); 2665 pf = fdopen(channel[0],"r"); 2666 debug_printf("pipe on FILE *%p\n",pf); 2667 #else 2668 free_pipe_list(head,0); 2669 pf=popen("echo surrogate response","r"); 2670 debug_printf("started fake pipe on FILE *%p\n",pf); 2671 #endif 2672 return pf; 2673 } 2674 2675 /* this version hacked for testing purposes */ 2676 /* return code is exit status of the process that is run. */ 2677 static int process_command_subs(o_string *dest, struct p_context *ctx, struct in_str *input, int subst_end) 2678 { 2679 int retcode; 2680 o_string result=NULL_O_STRING; 2681 struct p_context inner; 2682 FILE *p; 2683 struct in_str pipe_str; 2684 initialize_context(&inner); 2685 2686 /* recursion to generate command */ 2687 retcode = parse_stream(&result, &inner, input, subst_end); 2688 if (retcode != 0) return retcode; /* syntax error or EOF */ 2689 done_word(&result, &inner); 2690 done_pipe(&inner, PIPE_SEQ); 2691 b_free(&result); 2692 2693 p=generate_stream_from_list(inner.list_head); 2694 if (p==NULL) return 1; 2695 mark_open(fileno(p)); 2696 setup_file_in_str(&pipe_str, p); 2697 2698 /* now send results of command back into original context */ 2699 retcode = parse_stream(dest, ctx, &pipe_str, '\0'); 2700 /* XXX In case of a syntax error, should we try to kill the child? 2701 * That would be tough to do right, so just read until EOF. */ 2702 if (retcode == 1) { 2703 while (b_getch(&pipe_str)!=EOF) { /* discard */ }; 2704 } 2705 2706 debug_printf("done reading from pipe, pclose()ing\n"); 2707 /* This is the step that wait()s for the child. Should be pretty 2708 * safe, since we just read an EOF from its stdout. We could try 2709 * to better, by using wait(), and keeping track of background jobs 2710 * at the same time. That would be a lot of work, and contrary 2711 * to the KISS philosophy of this program. */ 2712 mark_closed(fileno(p)); 2713 retcode=pclose(p); 2714 free_pipe_list(inner.list_head,0); 2715 debug_printf("pclosed, retcode=%d\n",retcode); 2716 /* XXX this process fails to trim a single trailing newline */ 2717 return retcode; 2718 } 2719 2720 static int parse_group(o_string *dest, struct p_context *ctx, 2721 struct in_str *input, int ch) 2722 { 2723 int rcode, endch=0; 2724 struct p_context sub; 2725 struct child_prog *child = ctx->child; 2726 if (child->argv) { 2727 syntax(); 2728 return 1; /* syntax error, groups and arglists don't mix */ 2729 } 2730 initialize_context(&sub); 2731 switch(ch) { 2732 case '(': endch=')'; child->subshell=1; break; 2733 case '{': endch='}'; break; 2734 default: syntax(); /* really logic error */ 2735 } 2736 rcode=parse_stream(dest,&sub,input,endch); 2737 done_word(dest,&sub); /* finish off the final word in the subcontext */ 2738 done_pipe(&sub, PIPE_SEQ); /* and the final command there, too */ 2739 child->group = sub.list_head; 2740 return rcode; 2741 /* child remains "open", available for possible redirects */ 2742 } 2743 #endif 2744 2745 /* basically useful version until someone wants to get fancier, 2746 * see the bash man page under "Parameter Expansion" */ 2747 static char *lookup_param(char *src) 2748 { 2749 char *p; 2750 char *sep; 2751 char *default_val = NULL; 2752 int assign = 0; 2753 int expand_empty = 0; 2754 2755 if (!src) 2756 return NULL; 2757 2758 sep = strchr(src, ':'); 2759 2760 if (sep) { 2761 *sep = '\0'; 2762 if (*(sep + 1) == '-') 2763 default_val = sep+2; 2764 if (*(sep + 1) == '=') { 2765 default_val = sep+2; 2766 assign = 1; 2767 } 2768 if (*(sep + 1) == '+') { 2769 default_val = sep+2; 2770 expand_empty = 1; 2771 } 2772 } 2773 2774 p = getenv(src); 2775 if (!p) 2776 p = get_local_var(src); 2777 2778 if (!p || strlen(p) == 0) { 2779 p = default_val; 2780 if (assign) { 2781 char *var = malloc(strlen(src)+strlen(default_val)+2); 2782 if (var) { 2783 sprintf(var, "%s=%s", src, default_val); 2784 set_local_var(var, 0); 2785 } 2786 free(var); 2787 } 2788 } else if (expand_empty) { 2789 p += strlen(p); 2790 } 2791 2792 if (sep) 2793 *sep = ':'; 2794 2795 return p; 2796 } 2797 2798 #ifdef __U_BOOT__ 2799 static char *get_dollar_var(char ch) 2800 { 2801 static char buf[40]; 2802 2803 buf[0] = '\0'; 2804 switch (ch) { 2805 case '?': 2806 sprintf(buf, "%u", (unsigned int)last_return_code); 2807 break; 2808 default: 2809 return NULL; 2810 } 2811 return buf; 2812 } 2813 #endif 2814 2815 /* return code: 0 for OK, 1 for syntax error */ 2816 static int handle_dollar(o_string *dest, struct p_context *ctx, struct in_str *input) 2817 { 2818 #ifndef __U_BOOT__ 2819 int i, advance=0; 2820 #else 2821 int advance=0; 2822 #endif 2823 #ifndef __U_BOOT__ 2824 char sep[]=" "; 2825 #endif 2826 int ch = input->peek(input); /* first character after the $ */ 2827 debug_printf("handle_dollar: ch=%c\n",ch); 2828 if (isalpha(ch)) { 2829 b_addchr(dest, SPECIAL_VAR_SYMBOL); 2830 ctx->child->sp++; 2831 while(ch=b_peek(input),isalnum(ch) || ch=='_') { 2832 b_getch(input); 2833 b_addchr(dest,ch); 2834 } 2835 b_addchr(dest, SPECIAL_VAR_SYMBOL); 2836 #ifndef __U_BOOT__ 2837 } else if (isdigit(ch)) { 2838 i = ch-'0'; /* XXX is $0 special? */ 2839 if (i<global_argc) { 2840 parse_string(dest, ctx, global_argv[i]); /* recursion */ 2841 } 2842 advance = 1; 2843 #endif 2844 } else switch (ch) { 2845 #ifndef __U_BOOT__ 2846 case '$': 2847 b_adduint(dest,getpid()); 2848 advance = 1; 2849 break; 2850 case '!': 2851 if (last_bg_pid > 0) b_adduint(dest, last_bg_pid); 2852 advance = 1; 2853 break; 2854 #endif 2855 case '?': 2856 #ifndef __U_BOOT__ 2857 b_adduint(dest,last_return_code); 2858 #else 2859 ctx->child->sp++; 2860 b_addchr(dest, SPECIAL_VAR_SYMBOL); 2861 b_addchr(dest, '$'); 2862 b_addchr(dest, '?'); 2863 b_addchr(dest, SPECIAL_VAR_SYMBOL); 2864 #endif 2865 advance = 1; 2866 break; 2867 #ifndef __U_BOOT__ 2868 case '#': 2869 b_adduint(dest,global_argc ? global_argc-1 : 0); 2870 advance = 1; 2871 break; 2872 #endif 2873 case '{': 2874 b_addchr(dest, SPECIAL_VAR_SYMBOL); 2875 ctx->child->sp++; 2876 b_getch(input); 2877 /* XXX maybe someone will try to escape the '}' */ 2878 while(ch=b_getch(input),ch!=EOF && ch!='}') { 2879 b_addchr(dest,ch); 2880 } 2881 if (ch != '}') { 2882 syntax(); 2883 return 1; 2884 } 2885 b_addchr(dest, SPECIAL_VAR_SYMBOL); 2886 break; 2887 #ifndef __U_BOOT__ 2888 case '(': 2889 b_getch(input); 2890 process_command_subs(dest, ctx, input, ')'); 2891 break; 2892 case '*': 2893 sep[0]=ifs[0]; 2894 for (i=1; i<global_argc; i++) { 2895 parse_string(dest, ctx, global_argv[i]); 2896 if (i+1 < global_argc) parse_string(dest, ctx, sep); 2897 } 2898 break; 2899 case '@': 2900 case '-': 2901 case '_': 2902 /* still unhandled, but should be eventually */ 2903 error_msg("unhandled syntax: $%c",ch); 2904 return 1; 2905 break; 2906 #endif 2907 default: 2908 b_addqchr(dest,'$',dest->quote); 2909 } 2910 /* Eat the character if the flag was set. If the compiler 2911 * is smart enough, we could substitute "b_getch(input);" 2912 * for all the "advance = 1;" above, and also end up with 2913 * a nice size-optimized program. Hah! That'll be the day. 2914 */ 2915 if (advance) b_getch(input); 2916 return 0; 2917 } 2918 2919 #ifndef __U_BOOT__ 2920 int parse_string(o_string *dest, struct p_context *ctx, const char *src) 2921 { 2922 struct in_str foo; 2923 setup_string_in_str(&foo, src); 2924 return parse_stream(dest, ctx, &foo, '\0'); 2925 } 2926 #endif 2927 2928 /* return code is 0 for normal exit, 1 for syntax error */ 2929 static int parse_stream(o_string *dest, struct p_context *ctx, 2930 struct in_str *input, int end_trigger) 2931 { 2932 unsigned int ch, m; 2933 #ifndef __U_BOOT__ 2934 int redir_fd; 2935 redir_type redir_style; 2936 #endif 2937 int next; 2938 2939 /* Only double-quote state is handled in the state variable dest->quote. 2940 * A single-quote triggers a bypass of the main loop until its mate is 2941 * found. When recursing, quote state is passed in via dest->quote. */ 2942 2943 debug_printf("parse_stream, end_trigger=%d\n",end_trigger); 2944 while ((ch=b_getch(input))!=EOF) { 2945 m = map[ch]; 2946 #ifdef __U_BOOT__ 2947 if (input->__promptme == 0) return 1; 2948 #endif 2949 next = (ch == '\n') ? 0 : b_peek(input); 2950 2951 debug_printf("parse_stream: ch=%c (%d) m=%d quote=%d - %c\n", 2952 ch >= ' ' ? ch : '.', ch, m, 2953 dest->quote, ctx->stack == NULL ? '*' : '.'); 2954 2955 if (m==0 || ((m==1 || m==2) && dest->quote)) { 2956 b_addqchr(dest, ch, dest->quote); 2957 } else { 2958 if (m==2) { /* unquoted IFS */ 2959 if (done_word(dest, ctx)) { 2960 return 1; 2961 } 2962 /* If we aren't performing a substitution, treat a newline as a 2963 * command separator. */ 2964 if (end_trigger != '\0' && ch=='\n') 2965 done_pipe(ctx,PIPE_SEQ); 2966 } 2967 if (ch == end_trigger && !dest->quote && ctx->w==RES_NONE) { 2968 debug_printf("leaving parse_stream (triggered)\n"); 2969 return 0; 2970 } 2971 #if 0 2972 if (ch=='\n') { 2973 /* Yahoo! Time to run with it! */ 2974 done_pipe(ctx,PIPE_SEQ); 2975 run_list(ctx->list_head); 2976 initialize_context(ctx); 2977 } 2978 #endif 2979 if (m!=2) switch (ch) { 2980 case '#': 2981 if (dest->length == 0 && !dest->quote) { 2982 while(ch=b_peek(input),ch!=EOF && ch!='\n') { b_getch(input); } 2983 } else { 2984 b_addqchr(dest, ch, dest->quote); 2985 } 2986 break; 2987 case '\\': 2988 if (next == EOF) { 2989 syntax(); 2990 return 1; 2991 } 2992 b_addqchr(dest, '\\', dest->quote); 2993 b_addqchr(dest, b_getch(input), dest->quote); 2994 break; 2995 case '$': 2996 if (handle_dollar(dest, ctx, input)!=0) return 1; 2997 break; 2998 case '\'': 2999 dest->nonnull = 1; 3000 while(ch=b_getch(input),ch!=EOF && ch!='\'') { 3001 #ifdef __U_BOOT__ 3002 if(input->__promptme == 0) return 1; 3003 #endif 3004 b_addchr(dest,ch); 3005 } 3006 if (ch==EOF) { 3007 syntax(); 3008 return 1; 3009 } 3010 break; 3011 case '"': 3012 dest->nonnull = 1; 3013 dest->quote = !dest->quote; 3014 break; 3015 #ifndef __U_BOOT__ 3016 case '`': 3017 process_command_subs(dest, ctx, input, '`'); 3018 break; 3019 case '>': 3020 redir_fd = redirect_opt_num(dest); 3021 done_word(dest, ctx); 3022 redir_style=REDIRECT_OVERWRITE; 3023 if (next == '>') { 3024 redir_style=REDIRECT_APPEND; 3025 b_getch(input); 3026 } else if (next == '(') { 3027 syntax(); /* until we support >(list) Process Substitution */ 3028 return 1; 3029 } 3030 setup_redirect(ctx, redir_fd, redir_style, input); 3031 break; 3032 case '<': 3033 redir_fd = redirect_opt_num(dest); 3034 done_word(dest, ctx); 3035 redir_style=REDIRECT_INPUT; 3036 if (next == '<') { 3037 redir_style=REDIRECT_HEREIS; 3038 b_getch(input); 3039 } else if (next == '>') { 3040 redir_style=REDIRECT_IO; 3041 b_getch(input); 3042 } else if (next == '(') { 3043 syntax(); /* until we support <(list) Process Substitution */ 3044 return 1; 3045 } 3046 setup_redirect(ctx, redir_fd, redir_style, input); 3047 break; 3048 #endif 3049 case ';': 3050 done_word(dest, ctx); 3051 done_pipe(ctx,PIPE_SEQ); 3052 break; 3053 case '&': 3054 done_word(dest, ctx); 3055 if (next=='&') { 3056 b_getch(input); 3057 done_pipe(ctx,PIPE_AND); 3058 } else { 3059 #ifndef __U_BOOT__ 3060 done_pipe(ctx,PIPE_BG); 3061 #else 3062 syntax_err(); 3063 return 1; 3064 #endif 3065 } 3066 break; 3067 case '|': 3068 done_word(dest, ctx); 3069 if (next=='|') { 3070 b_getch(input); 3071 done_pipe(ctx,PIPE_OR); 3072 } else { 3073 /* we could pick up a file descriptor choice here 3074 * with redirect_opt_num(), but bash doesn't do it. 3075 * "echo foo 2| cat" yields "foo 2". */ 3076 #ifndef __U_BOOT__ 3077 done_command(ctx); 3078 #else 3079 syntax_err(); 3080 return 1; 3081 #endif 3082 } 3083 break; 3084 #ifndef __U_BOOT__ 3085 case '(': 3086 case '{': 3087 if (parse_group(dest, ctx, input, ch)!=0) return 1; 3088 break; 3089 case ')': 3090 case '}': 3091 syntax(); /* Proper use of this character caught by end_trigger */ 3092 return 1; 3093 break; 3094 #endif 3095 case SUBSTED_VAR_SYMBOL: 3096 dest->nonnull = 1; 3097 while (ch = b_getch(input), ch != EOF && 3098 ch != SUBSTED_VAR_SYMBOL) { 3099 debug_printf("subst, pass=%d\n", ch); 3100 if (input->__promptme == 0) 3101 return 1; 3102 b_addchr(dest, ch); 3103 } 3104 debug_printf("subst, term=%d\n", ch); 3105 if (ch == EOF) { 3106 syntax(); 3107 return 1; 3108 } 3109 break; 3110 default: 3111 syntax(); /* this is really an internal logic error */ 3112 return 1; 3113 } 3114 } 3115 } 3116 /* complain if quote? No, maybe we just finished a command substitution 3117 * that was quoted. Example: 3118 * $ echo "`cat foo` plus more" 3119 * and we just got the EOF generated by the subshell that ran "cat foo" 3120 * The only real complaint is if we got an EOF when end_trigger != '\0', 3121 * that is, we were really supposed to get end_trigger, and never got 3122 * one before the EOF. Can't use the standard "syntax error" return code, 3123 * so that parse_stream_outer can distinguish the EOF and exit smoothly. */ 3124 debug_printf("leaving parse_stream (EOF)\n"); 3125 if (end_trigger != '\0') return -1; 3126 return 0; 3127 } 3128 3129 static void mapset(const unsigned char *set, int code) 3130 { 3131 const unsigned char *s; 3132 for (s=set; *s; s++) map[*s] = code; 3133 } 3134 3135 static void update_ifs_map(void) 3136 { 3137 /* char *ifs and char map[256] are both globals. */ 3138 ifs = (uchar *)getenv("IFS"); 3139 if (ifs == NULL) ifs=(uchar *)" \t\n"; 3140 /* Precompute a list of 'flow through' behavior so it can be treated 3141 * quickly up front. Computation is necessary because of IFS. 3142 * Special case handling of IFS == " \t\n" is not implemented. 3143 * The map[] array only really needs two bits each, and on most machines 3144 * that would be faster because of the reduced L1 cache footprint. 3145 */ 3146 memset(map,0,sizeof(map)); /* most characters flow through always */ 3147 #ifndef __U_BOOT__ 3148 mapset((uchar *)"\\$'\"`", 3); /* never flow through */ 3149 mapset((uchar *)"<>;&|(){}#", 1); /* flow through if quoted */ 3150 #else 3151 { 3152 uchar subst[2] = {SUBSTED_VAR_SYMBOL, 0}; 3153 mapset(subst, 3); /* never flow through */ 3154 } 3155 mapset((uchar *)"\\$'\"", 3); /* never flow through */ 3156 mapset((uchar *)";&|#", 1); /* flow through if quoted */ 3157 #endif 3158 mapset(ifs, 2); /* also flow through if quoted */ 3159 } 3160 3161 /* most recursion does not come through here, the exeception is 3162 * from builtin_source() */ 3163 static int parse_stream_outer(struct in_str *inp, int flag) 3164 { 3165 3166 struct p_context ctx; 3167 o_string temp=NULL_O_STRING; 3168 int rcode; 3169 #ifdef __U_BOOT__ 3170 int code = 0; 3171 #endif 3172 do { 3173 ctx.type = flag; 3174 initialize_context(&ctx); 3175 update_ifs_map(); 3176 if (!(flag & FLAG_PARSE_SEMICOLON) || (flag & FLAG_REPARSING)) mapset((uchar *)";$&|", 0); 3177 inp->promptmode=1; 3178 rcode = parse_stream(&temp, &ctx, inp, '\n'); 3179 #ifdef __U_BOOT__ 3180 if (rcode == 1) flag_repeat = 0; 3181 #endif 3182 if (rcode != 1 && ctx.old_flag != 0) { 3183 syntax(); 3184 #ifdef __U_BOOT__ 3185 flag_repeat = 0; 3186 #endif 3187 } 3188 if (rcode != 1 && ctx.old_flag == 0) { 3189 done_word(&temp, &ctx); 3190 done_pipe(&ctx,PIPE_SEQ); 3191 #ifndef __U_BOOT__ 3192 run_list(ctx.list_head); 3193 #else 3194 code = run_list(ctx.list_head); 3195 if (code == -2) { /* exit */ 3196 b_free(&temp); 3197 code = 0; 3198 /* XXX hackish way to not allow exit from main loop */ 3199 if (inp->peek == file_peek) { 3200 printf("exit not allowed from main input shell.\n"); 3201 continue; 3202 } 3203 break; 3204 } 3205 if (code == -1) 3206 flag_repeat = 0; 3207 #endif 3208 } else { 3209 if (ctx.old_flag != 0) { 3210 free(ctx.stack); 3211 b_reset(&temp); 3212 } 3213 #ifdef __U_BOOT__ 3214 if (inp->__promptme == 0) printf("<INTERRUPT>\n"); 3215 inp->__promptme = 1; 3216 #endif 3217 temp.nonnull = 0; 3218 temp.quote = 0; 3219 inp->p = NULL; 3220 free_pipe_list(ctx.list_head,0); 3221 } 3222 b_free(&temp); 3223 } while (rcode != -1 && !(flag & FLAG_EXIT_FROM_LOOP)); /* loop on syntax errors, return on EOF */ 3224 #ifndef __U_BOOT__ 3225 return 0; 3226 #else 3227 return (code != 0) ? 1 : 0; 3228 #endif /* __U_BOOT__ */ 3229 } 3230 3231 #ifndef __U_BOOT__ 3232 static int parse_string_outer(const char *s, int flag) 3233 #else 3234 int parse_string_outer(const char *s, int flag) 3235 #endif /* __U_BOOT__ */ 3236 { 3237 struct in_str input; 3238 #ifdef __U_BOOT__ 3239 char *p = NULL; 3240 int rcode; 3241 if ( !s || !*s) 3242 return 1; 3243 if (!(p = strchr(s, '\n')) || *++p) { 3244 p = xmalloc(strlen(s) + 2); 3245 strcpy(p, s); 3246 strcat(p, "\n"); 3247 setup_string_in_str(&input, p); 3248 rcode = parse_stream_outer(&input, flag); 3249 free(p); 3250 return rcode; 3251 } else { 3252 #endif 3253 setup_string_in_str(&input, s); 3254 return parse_stream_outer(&input, flag); 3255 #ifdef __U_BOOT__ 3256 } 3257 #endif 3258 } 3259 3260 #ifndef __U_BOOT__ 3261 static int parse_file_outer(FILE *f) 3262 #else 3263 int parse_file_outer(void) 3264 #endif 3265 { 3266 int rcode; 3267 struct in_str input; 3268 #ifndef __U_BOOT__ 3269 setup_file_in_str(&input, f); 3270 #else 3271 setup_file_in_str(&input); 3272 #endif 3273 rcode = parse_stream_outer(&input, FLAG_PARSE_SEMICOLON); 3274 return rcode; 3275 } 3276 3277 #ifdef __U_BOOT__ 3278 #ifdef CONFIG_NEEDS_MANUAL_RELOC 3279 static void u_boot_hush_reloc(void) 3280 { 3281 unsigned long addr; 3282 struct reserved_combo *r; 3283 3284 for (r=reserved_list; r<reserved_list+NRES; r++) { 3285 addr = (ulong) (r->literal) + gd->reloc_off; 3286 r->literal = (char *)addr; 3287 } 3288 } 3289 #endif 3290 3291 int u_boot_hush_start(void) 3292 { 3293 if (top_vars == NULL) { 3294 top_vars = malloc(sizeof(struct variables)); 3295 top_vars->name = "HUSH_VERSION"; 3296 top_vars->value = "0.01"; 3297 top_vars->next = NULL; 3298 top_vars->flg_export = 0; 3299 top_vars->flg_read_only = 1; 3300 #ifdef CONFIG_NEEDS_MANUAL_RELOC 3301 u_boot_hush_reloc(); 3302 #endif 3303 } 3304 return 0; 3305 } 3306 3307 static void *xmalloc(size_t size) 3308 { 3309 void *p = NULL; 3310 3311 if (!(p = malloc(size))) { 3312 printf("ERROR : memory not allocated\n"); 3313 for(;;); 3314 } 3315 return p; 3316 } 3317 3318 static void *xrealloc(void *ptr, size_t size) 3319 { 3320 void *p = NULL; 3321 3322 if (!(p = realloc(ptr, size))) { 3323 printf("ERROR : memory not allocated\n"); 3324 for(;;); 3325 } 3326 return p; 3327 } 3328 #endif /* __U_BOOT__ */ 3329 3330 #ifndef __U_BOOT__ 3331 /* Make sure we have a controlling tty. If we get started under a job 3332 * aware app (like bash for example), make sure we are now in charge so 3333 * we don't fight over who gets the foreground */ 3334 static void setup_job_control(void) 3335 { 3336 static pid_t shell_pgrp; 3337 /* Loop until we are in the foreground. */ 3338 while (tcgetpgrp (shell_terminal) != (shell_pgrp = getpgrp ())) 3339 kill (- shell_pgrp, SIGTTIN); 3340 3341 /* Ignore interactive and job-control signals. */ 3342 signal(SIGINT, SIG_IGN); 3343 signal(SIGQUIT, SIG_IGN); 3344 signal(SIGTERM, SIG_IGN); 3345 signal(SIGTSTP, SIG_IGN); 3346 signal(SIGTTIN, SIG_IGN); 3347 signal(SIGTTOU, SIG_IGN); 3348 signal(SIGCHLD, SIG_IGN); 3349 3350 /* Put ourselves in our own process group. */ 3351 setsid(); 3352 shell_pgrp = getpid (); 3353 setpgid (shell_pgrp, shell_pgrp); 3354 3355 /* Grab control of the terminal. */ 3356 tcsetpgrp(shell_terminal, shell_pgrp); 3357 } 3358 3359 int hush_main(int argc, char * const *argv) 3360 { 3361 int opt; 3362 FILE *input; 3363 char **e = environ; 3364 3365 /* XXX what should these be while sourcing /etc/profile? */ 3366 global_argc = argc; 3367 global_argv = argv; 3368 3369 /* (re?) initialize globals. Sometimes hush_main() ends up calling 3370 * hush_main(), therefore we cannot rely on the BSS to zero out this 3371 * stuff. Reset these to 0 every time. */ 3372 ifs = NULL; 3373 /* map[] is taken care of with call to update_ifs_map() */ 3374 fake_mode = 0; 3375 interactive = 0; 3376 close_me_head = NULL; 3377 last_bg_pid = 0; 3378 job_list = NULL; 3379 last_jobid = 0; 3380 3381 /* Initialize some more globals to non-zero values */ 3382 set_cwd(); 3383 #ifdef CONFIG_FEATURE_COMMAND_EDITING 3384 cmdedit_set_initial_prompt(); 3385 #else 3386 PS1 = NULL; 3387 #endif 3388 PS2 = "> "; 3389 3390 /* initialize our shell local variables with the values 3391 * currently living in the environment */ 3392 if (e) { 3393 for (; *e; e++) 3394 set_local_var(*e, 2); /* without call putenv() */ 3395 } 3396 3397 last_return_code=EXIT_SUCCESS; 3398 3399 3400 if (argv[0] && argv[0][0] == '-') { 3401 debug_printf("\nsourcing /etc/profile\n"); 3402 if ((input = fopen("/etc/profile", "r")) != NULL) { 3403 mark_open(fileno(input)); 3404 parse_file_outer(input); 3405 mark_closed(fileno(input)); 3406 fclose(input); 3407 } 3408 } 3409 input=stdin; 3410 3411 while ((opt = getopt(argc, argv, "c:xif")) > 0) { 3412 switch (opt) { 3413 case 'c': 3414 { 3415 global_argv = argv+optind; 3416 global_argc = argc-optind; 3417 opt = parse_string_outer(optarg, FLAG_PARSE_SEMICOLON); 3418 goto final_return; 3419 } 3420 break; 3421 case 'i': 3422 interactive++; 3423 break; 3424 case 'f': 3425 fake_mode++; 3426 break; 3427 default: 3428 #ifndef BB_VER 3429 fprintf(stderr, "Usage: sh [FILE]...\n" 3430 " or: sh -c command [args]...\n\n"); 3431 exit(EXIT_FAILURE); 3432 #else 3433 show_usage(); 3434 #endif 3435 } 3436 } 3437 /* A shell is interactive if the `-i' flag was given, or if all of 3438 * the following conditions are met: 3439 * no -c command 3440 * no arguments remaining or the -s flag given 3441 * standard input is a terminal 3442 * standard output is a terminal 3443 * Refer to Posix.2, the description of the `sh' utility. */ 3444 if (argv[optind]==NULL && input==stdin && 3445 isatty(fileno(stdin)) && isatty(fileno(stdout))) { 3446 interactive++; 3447 } 3448 3449 debug_printf("\ninteractive=%d\n", interactive); 3450 if (interactive) { 3451 /* Looks like they want an interactive shell */ 3452 #ifndef CONFIG_FEATURE_SH_EXTRA_QUIET 3453 printf( "\n\n" BB_BANNER " hush - the humble shell v0.01 (testing)\n"); 3454 printf( "Enter 'help' for a list of built-in commands.\n\n"); 3455 #endif 3456 setup_job_control(); 3457 } 3458 3459 if (argv[optind]==NULL) { 3460 opt=parse_file_outer(stdin); 3461 goto final_return; 3462 } 3463 3464 debug_printf("\nrunning script '%s'\n", argv[optind]); 3465 global_argv = argv+optind; 3466 global_argc = argc-optind; 3467 input = xfopen(argv[optind], "r"); 3468 opt = parse_file_outer(input); 3469 3470 #ifdef CONFIG_FEATURE_CLEAN_UP 3471 fclose(input); 3472 if (cwd && cwd != unknown) 3473 free((char*)cwd); 3474 { 3475 struct variables *cur, *tmp; 3476 for(cur = top_vars; cur; cur = tmp) { 3477 tmp = cur->next; 3478 if (!cur->flg_read_only) { 3479 free(cur->name); 3480 free(cur->value); 3481 free(cur); 3482 } 3483 } 3484 } 3485 #endif 3486 3487 final_return: 3488 return(opt?opt:last_return_code); 3489 } 3490 #endif 3491 3492 static char *insert_var_value(char *inp) 3493 { 3494 return insert_var_value_sub(inp, 0); 3495 } 3496 3497 static char *insert_var_value_sub(char *inp, int tag_subst) 3498 { 3499 int res_str_len = 0; 3500 int len; 3501 int done = 0; 3502 char *p, *p1, *res_str = NULL; 3503 3504 while ((p = strchr(inp, SPECIAL_VAR_SYMBOL))) { 3505 /* check the beginning of the string for normal charachters */ 3506 if (p != inp) { 3507 /* copy any charachters to the result string */ 3508 len = p - inp; 3509 res_str = xrealloc(res_str, (res_str_len + len)); 3510 strncpy((res_str + res_str_len), inp, len); 3511 res_str_len += len; 3512 } 3513 inp = ++p; 3514 /* find the ending marker */ 3515 p = strchr(inp, SPECIAL_VAR_SYMBOL); 3516 *p = '\0'; 3517 /* look up the value to substitute */ 3518 if ((p1 = lookup_param(inp))) { 3519 if (tag_subst) 3520 len = res_str_len + strlen(p1) + 2; 3521 else 3522 len = res_str_len + strlen(p1); 3523 res_str = xrealloc(res_str, (1 + len)); 3524 if (tag_subst) { 3525 /* 3526 * copy the variable value to the result 3527 * string 3528 */ 3529 strcpy((res_str + res_str_len + 1), p1); 3530 3531 /* 3532 * mark the replaced text to be accepted as 3533 * is 3534 */ 3535 res_str[res_str_len] = SUBSTED_VAR_SYMBOL; 3536 res_str[res_str_len + 1 + strlen(p1)] = 3537 SUBSTED_VAR_SYMBOL; 3538 } else 3539 /* 3540 * copy the variable value to the result 3541 * string 3542 */ 3543 strcpy((res_str + res_str_len), p1); 3544 3545 res_str_len = len; 3546 } 3547 *p = SPECIAL_VAR_SYMBOL; 3548 inp = ++p; 3549 done = 1; 3550 } 3551 if (done) { 3552 res_str = xrealloc(res_str, (1 + res_str_len + strlen(inp))); 3553 strcpy((res_str + res_str_len), inp); 3554 while ((p = strchr(res_str, '\n'))) { 3555 *p = ' '; 3556 } 3557 } 3558 return (res_str == NULL) ? inp : res_str; 3559 } 3560 3561 static char **make_list_in(char **inp, char *name) 3562 { 3563 int len, i; 3564 int name_len = strlen(name); 3565 int n = 0; 3566 char **list; 3567 char *p1, *p2, *p3; 3568 3569 /* create list of variable values */ 3570 list = xmalloc(sizeof(*list)); 3571 for (i = 0; inp[i]; i++) { 3572 p3 = insert_var_value(inp[i]); 3573 p1 = p3; 3574 while (*p1) { 3575 if ((*p1 == ' ')) { 3576 p1++; 3577 continue; 3578 } 3579 if ((p2 = strchr(p1, ' '))) { 3580 len = p2 - p1; 3581 } else { 3582 len = strlen(p1); 3583 p2 = p1 + len; 3584 } 3585 /* we use n + 2 in realloc for list,because we add 3586 * new element and then we will add NULL element */ 3587 list = xrealloc(list, sizeof(*list) * (n + 2)); 3588 list[n] = xmalloc(2 + name_len + len); 3589 strcpy(list[n], name); 3590 strcat(list[n], "="); 3591 strncat(list[n], p1, len); 3592 list[n++][name_len + len + 1] = '\0'; 3593 p1 = p2; 3594 } 3595 if (p3 != inp[i]) free(p3); 3596 } 3597 list[n] = NULL; 3598 return list; 3599 } 3600 3601 /* 3602 * Make new string for parser 3603 * inp - array of argument strings to flatten 3604 * nonnull - indicates argument was quoted when originally parsed 3605 */ 3606 static char *make_string(char **inp, int *nonnull) 3607 { 3608 char *p; 3609 char *str = NULL; 3610 int n; 3611 int len = 2; 3612 char *noeval_str; 3613 int noeval = 0; 3614 3615 noeval_str = get_local_var("HUSH_NO_EVAL"); 3616 if (noeval_str != NULL && *noeval_str != '0' && *noeval_str != '\0') 3617 noeval = 1; 3618 for (n = 0; inp[n]; n++) { 3619 p = insert_var_value_sub(inp[n], noeval); 3620 str = xrealloc(str, (len + strlen(p) + (2 * nonnull[n]))); 3621 if (n) { 3622 strcat(str, " "); 3623 } else { 3624 *str = '\0'; 3625 } 3626 if (nonnull[n]) 3627 strcat(str, "'"); 3628 strcat(str, p); 3629 if (nonnull[n]) 3630 strcat(str, "'"); 3631 len = strlen(str) + 3; 3632 if (p != inp[n]) free(p); 3633 } 3634 len = strlen(str); 3635 *(str + len) = '\n'; 3636 *(str + len + 1) = '\0'; 3637 return str; 3638 } 3639 3640 #ifdef __U_BOOT__ 3641 static int do_showvar(cmd_tbl_t *cmdtp, int flag, int argc, 3642 char * const argv[]) 3643 { 3644 int i, k; 3645 int rcode = 0; 3646 struct variables *cur; 3647 3648 if (argc == 1) { /* Print all env variables */ 3649 for (cur = top_vars; cur; cur = cur->next) { 3650 printf ("%s=%s\n", cur->name, cur->value); 3651 if (ctrlc ()) { 3652 puts ("\n ** Abort\n"); 3653 return 1; 3654 } 3655 } 3656 return 0; 3657 } 3658 for (i = 1; i < argc; ++i) { /* print single env variables */ 3659 char *name = argv[i]; 3660 3661 k = -1; 3662 for (cur = top_vars; cur; cur = cur->next) { 3663 if(strcmp (cur->name, name) == 0) { 3664 k = 0; 3665 printf ("%s=%s\n", cur->name, cur->value); 3666 } 3667 if (ctrlc ()) { 3668 puts ("\n ** Abort\n"); 3669 return 1; 3670 } 3671 } 3672 if (k < 0) { 3673 printf ("## Error: \"%s\" not defined\n", name); 3674 rcode ++; 3675 } 3676 } 3677 return rcode; 3678 } 3679 3680 U_BOOT_CMD( 3681 showvar, CONFIG_SYS_MAXARGS, 1, do_showvar, 3682 "print local hushshell variables", 3683 "\n - print values of all hushshell variables\n" 3684 "showvar name ...\n" 3685 " - print value of hushshell variable 'name'" 3686 ); 3687 3688 #endif 3689 /****************************************************************************/ 3690