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 <console.h> 83 #include <bootretry.h> 84 #include <cli.h> 85 #include <cli_hush.h> 86 #include <command.h> /* find_cmd */ 87 #ifndef CONFIG_SYS_PROMPT_HUSH_PS2 88 #define CONFIG_SYS_PROMPT_HUSH_PS2 "> " 89 #endif 90 #endif 91 #ifndef __U_BOOT__ 92 #include <ctype.h> /* isalpha, isdigit */ 93 #include <unistd.h> /* getpid */ 94 #include <stdlib.h> /* getenv, atoi */ 95 #include <string.h> /* strchr */ 96 #include <stdio.h> /* popen etc. */ 97 #include <glob.h> /* glob, of course */ 98 #include <stdarg.h> /* va_list */ 99 #include <errno.h> 100 #include <fcntl.h> 101 #include <getopt.h> /* should be pretty obvious */ 102 103 #include <sys/stat.h> /* ulimit */ 104 #include <sys/types.h> 105 #include <sys/wait.h> 106 #include <signal.h> 107 108 /* #include <dmalloc.h> */ 109 110 #if 1 111 #include "busybox.h" 112 #include "cmdedit.h" 113 #else 114 #define applet_name "hush" 115 #include "standalone.h" 116 #define hush_main main 117 #undef CONFIG_FEATURE_SH_FANCY_PROMPT 118 #define BB_BANNER 119 #endif 120 #endif 121 #define SPECIAL_VAR_SYMBOL 03 122 #define SUBSTED_VAR_SYMBOL 04 123 #ifndef __U_BOOT__ 124 #define FLAG_EXIT_FROM_LOOP 1 125 #define FLAG_PARSE_SEMICOLON (1 << 1) /* symbol ';' is special for parser */ 126 #define FLAG_REPARSING (1 << 2) /* >= 2nd pass */ 127 128 #endif 129 130 #ifdef __U_BOOT__ 131 DECLARE_GLOBAL_DATA_PTR; 132 133 #define EXIT_SUCCESS 0 134 #define EOF -1 135 #define syntax() syntax_err() 136 #define xstrdup strdup 137 #define error_msg printf 138 #else 139 typedef enum { 140 REDIRECT_INPUT = 1, 141 REDIRECT_OVERWRITE = 2, 142 REDIRECT_APPEND = 3, 143 REDIRECT_HEREIS = 4, 144 REDIRECT_IO = 5 145 } redir_type; 146 147 /* The descrip member of this structure is only used to make debugging 148 * output pretty */ 149 struct {int mode; int default_fd; char *descrip;} redir_table[] = { 150 { 0, 0, "()" }, 151 { O_RDONLY, 0, "<" }, 152 { O_CREAT|O_TRUNC|O_WRONLY, 1, ">" }, 153 { O_CREAT|O_APPEND|O_WRONLY, 1, ">>" }, 154 { O_RDONLY, -1, "<<" }, 155 { O_RDWR, 1, "<>" } 156 }; 157 #endif 158 159 typedef enum { 160 PIPE_SEQ = 1, 161 PIPE_AND = 2, 162 PIPE_OR = 3, 163 PIPE_BG = 4, 164 } pipe_style; 165 166 /* might eventually control execution */ 167 typedef enum { 168 RES_NONE = 0, 169 RES_IF = 1, 170 RES_THEN = 2, 171 RES_ELIF = 3, 172 RES_ELSE = 4, 173 RES_FI = 5, 174 RES_FOR = 6, 175 RES_WHILE = 7, 176 RES_UNTIL = 8, 177 RES_DO = 9, 178 RES_DONE = 10, 179 RES_XXXX = 11, 180 RES_IN = 12, 181 RES_SNTX = 13 182 } reserved_style; 183 #define FLAG_END (1<<RES_NONE) 184 #define FLAG_IF (1<<RES_IF) 185 #define FLAG_THEN (1<<RES_THEN) 186 #define FLAG_ELIF (1<<RES_ELIF) 187 #define FLAG_ELSE (1<<RES_ELSE) 188 #define FLAG_FI (1<<RES_FI) 189 #define FLAG_FOR (1<<RES_FOR) 190 #define FLAG_WHILE (1<<RES_WHILE) 191 #define FLAG_UNTIL (1<<RES_UNTIL) 192 #define FLAG_DO (1<<RES_DO) 193 #define FLAG_DONE (1<<RES_DONE) 194 #define FLAG_IN (1<<RES_IN) 195 #define FLAG_START (1<<RES_XXXX) 196 197 /* This holds pointers to the various results of parsing */ 198 struct p_context { 199 struct child_prog *child; 200 struct pipe *list_head; 201 struct pipe *pipe; 202 #ifndef __U_BOOT__ 203 struct redir_struct *pending_redirect; 204 #endif 205 reserved_style w; 206 int old_flag; /* for figuring out valid reserved words */ 207 struct p_context *stack; 208 int type; /* define type of parser : ";$" common or special symbol */ 209 /* How about quoting status? */ 210 }; 211 212 #ifndef __U_BOOT__ 213 struct redir_struct { 214 redir_type type; /* type of redirection */ 215 int fd; /* file descriptor being redirected */ 216 int dup; /* -1, or file descriptor being duplicated */ 217 struct redir_struct *next; /* pointer to the next redirect in the list */ 218 glob_t word; /* *word.gl_pathv is the filename */ 219 }; 220 #endif 221 222 struct child_prog { 223 #ifndef __U_BOOT__ 224 pid_t pid; /* 0 if exited */ 225 #endif 226 char **argv; /* program name and arguments */ 227 /* was quoted when parsed; copy of struct o_string.nonnull field */ 228 int *argv_nonnull; 229 #ifdef __U_BOOT__ 230 int argc; /* number of program arguments */ 231 #endif 232 struct pipe *group; /* if non-NULL, first in group or subshell */ 233 #ifndef __U_BOOT__ 234 int subshell; /* flag, non-zero if group must be forked */ 235 struct redir_struct *redirects; /* I/O redirections */ 236 glob_t glob_result; /* result of parameter globbing */ 237 int is_stopped; /* is the program currently running? */ 238 struct pipe *family; /* pointer back to the child's parent pipe */ 239 #endif 240 int sp; /* number of SPECIAL_VAR_SYMBOL */ 241 int type; 242 }; 243 244 struct pipe { 245 #ifndef __U_BOOT__ 246 int jobid; /* job number */ 247 #endif 248 int num_progs; /* total number of programs in job */ 249 #ifndef __U_BOOT__ 250 int running_progs; /* number of programs running */ 251 char *text; /* name of job */ 252 char *cmdbuf; /* buffer various argv's point into */ 253 pid_t pgrp; /* process group ID for the job */ 254 #endif 255 struct child_prog *progs; /* array of commands in pipe */ 256 struct pipe *next; /* to track background commands */ 257 #ifndef __U_BOOT__ 258 int stopped_progs; /* number of programs alive, but stopped */ 259 int job_context; /* bitmask defining current context */ 260 #endif 261 pipe_style followup; /* PIPE_BG, PIPE_SEQ, PIPE_OR, PIPE_AND */ 262 reserved_style r_mode; /* supports if, for, while, until */ 263 }; 264 265 #ifndef __U_BOOT__ 266 struct close_me { 267 int fd; 268 struct close_me *next; 269 }; 270 #endif 271 272 struct variables { 273 char *name; 274 char *value; 275 int flg_export; 276 int flg_read_only; 277 struct variables *next; 278 }; 279 280 /* globals, connect us to the outside world 281 * the first three support $?, $#, and $1 */ 282 #ifndef __U_BOOT__ 283 char **global_argv; 284 unsigned int global_argc; 285 #endif 286 static unsigned int last_return_code; 287 #ifndef __U_BOOT__ 288 extern char **environ; /* This is in <unistd.h>, but protected with __USE_GNU */ 289 #endif 290 291 /* "globals" within this file */ 292 static uchar *ifs; 293 static char map[256]; 294 #ifndef __U_BOOT__ 295 static int fake_mode; 296 static int interactive; 297 static struct close_me *close_me_head; 298 static const char *cwd; 299 static struct pipe *job_list; 300 static unsigned int last_bg_pid; 301 static unsigned int last_jobid; 302 static unsigned int shell_terminal; 303 static char *PS1; 304 static char *PS2; 305 struct variables shell_ver = { "HUSH_VERSION", "0.01", 1, 1, 0 }; 306 struct variables *top_vars = &shell_ver; 307 #else 308 static int flag_repeat = 0; 309 static int do_repeat = 0; 310 static struct variables *top_vars = NULL ; 311 #endif /*__U_BOOT__ */ 312 313 #define B_CHUNK (100) 314 #define B_NOSPAC 1 315 316 typedef struct { 317 char *data; 318 int length; 319 int maxlen; 320 int quote; 321 int nonnull; 322 } o_string; 323 #define NULL_O_STRING {NULL,0,0,0,0} 324 /* used for initialization: 325 o_string foo = NULL_O_STRING; */ 326 327 /* I can almost use ordinary FILE *. Is open_memstream() universally 328 * available? Where is it documented? */ 329 struct in_str { 330 const char *p; 331 #ifndef __U_BOOT__ 332 char peek_buf[2]; 333 #endif 334 int __promptme; 335 int promptmode; 336 #ifndef __U_BOOT__ 337 FILE *file; 338 #endif 339 int (*get) (struct in_str *); 340 int (*peek) (struct in_str *); 341 }; 342 #define b_getch(input) ((input)->get(input)) 343 #define b_peek(input) ((input)->peek(input)) 344 345 #ifndef __U_BOOT__ 346 #define JOB_STATUS_FORMAT "[%d] %-22s %.40s\n" 347 348 struct built_in_command { 349 char *cmd; /* name */ 350 char *descr; /* description */ 351 int (*function) (struct child_prog *); /* function ptr */ 352 }; 353 #endif 354 355 /* define DEBUG_SHELL for debugging output (obviously ;-)) */ 356 #if 0 357 #define DEBUG_SHELL 358 #endif 359 360 /* This should be in utility.c */ 361 #ifdef DEBUG_SHELL 362 #ifndef __U_BOOT__ 363 static void debug_printf(const char *format, ...) 364 { 365 va_list args; 366 va_start(args, format); 367 vfprintf(stderr, format, args); 368 va_end(args); 369 } 370 #else 371 #define debug_printf(fmt,args...) printf (fmt ,##args) 372 #endif 373 #else 374 static inline void debug_printf(const char *format, ...) { } 375 #endif 376 #define final_printf debug_printf 377 378 #ifdef __U_BOOT__ 379 static void syntax_err(void) { 380 printf("syntax error\n"); 381 } 382 #else 383 static void __syntax(char *file, int line) { 384 error_msg("syntax error %s:%d", file, line); 385 } 386 #define syntax() __syntax(__FILE__, __LINE__) 387 #endif 388 389 #ifdef __U_BOOT__ 390 static void *xmalloc(size_t size); 391 static void *xrealloc(void *ptr, size_t size); 392 #else 393 /* Index of subroutines: */ 394 /* function prototypes for builtins */ 395 static int builtin_cd(struct child_prog *child); 396 static int builtin_env(struct child_prog *child); 397 static int builtin_eval(struct child_prog *child); 398 static int builtin_exec(struct child_prog *child); 399 static int builtin_exit(struct child_prog *child); 400 static int builtin_export(struct child_prog *child); 401 static int builtin_fg_bg(struct child_prog *child); 402 static int builtin_help(struct child_prog *child); 403 static int builtin_jobs(struct child_prog *child); 404 static int builtin_pwd(struct child_prog *child); 405 static int builtin_read(struct child_prog *child); 406 static int builtin_set(struct child_prog *child); 407 static int builtin_shift(struct child_prog *child); 408 static int builtin_source(struct child_prog *child); 409 static int builtin_umask(struct child_prog *child); 410 static int builtin_unset(struct child_prog *child); 411 static int builtin_not_written(struct child_prog *child); 412 #endif 413 /* o_string manipulation: */ 414 static int b_check_space(o_string *o, int len); 415 static int b_addchr(o_string *o, int ch); 416 static void b_reset(o_string *o); 417 static int b_addqchr(o_string *o, int ch, int quote); 418 #ifndef __U_BOOT__ 419 static int b_adduint(o_string *o, unsigned int i); 420 #endif 421 /* in_str manipulations: */ 422 static int static_get(struct in_str *i); 423 static int static_peek(struct in_str *i); 424 static int file_get(struct in_str *i); 425 static int file_peek(struct in_str *i); 426 #ifndef __U_BOOT__ 427 static void setup_file_in_str(struct in_str *i, FILE *f); 428 #else 429 static void setup_file_in_str(struct in_str *i); 430 #endif 431 static void setup_string_in_str(struct in_str *i, const char *s); 432 #ifndef __U_BOOT__ 433 /* close_me manipulations: */ 434 static void mark_open(int fd); 435 static void mark_closed(int fd); 436 static void close_all(void); 437 #endif 438 /* "run" the final data structures: */ 439 static char *indenter(int i); 440 static int free_pipe_list(struct pipe *head, int indent); 441 static int free_pipe(struct pipe *pi, int indent); 442 /* really run the final data structures: */ 443 #ifndef __U_BOOT__ 444 static int setup_redirects(struct child_prog *prog, int squirrel[]); 445 #endif 446 static int run_list_real(struct pipe *pi); 447 #ifndef __U_BOOT__ 448 static void pseudo_exec(struct child_prog *child) __attribute__ ((noreturn)); 449 #endif 450 static int run_pipe_real(struct pipe *pi); 451 /* extended glob support: */ 452 #ifndef __U_BOOT__ 453 static int globhack(const char *src, int flags, glob_t *pglob); 454 static int glob_needed(const char *s); 455 static int xglob(o_string *dest, int flags, glob_t *pglob); 456 #endif 457 /* variable assignment: */ 458 static int is_assignment(const char *s); 459 /* data structure manipulation: */ 460 #ifndef __U_BOOT__ 461 static int setup_redirect(struct p_context *ctx, int fd, redir_type style, struct in_str *input); 462 #endif 463 static void initialize_context(struct p_context *ctx); 464 static int done_word(o_string *dest, struct p_context *ctx); 465 static int done_command(struct p_context *ctx); 466 static int done_pipe(struct p_context *ctx, pipe_style type); 467 /* primary string parsing: */ 468 #ifndef __U_BOOT__ 469 static int redirect_dup_num(struct in_str *input); 470 static int redirect_opt_num(o_string *o); 471 static int process_command_subs(o_string *dest, struct p_context *ctx, struct in_str *input, int subst_end); 472 static int parse_group(o_string *dest, struct p_context *ctx, struct in_str *input, int ch); 473 #endif 474 static char *lookup_param(char *src); 475 static char *make_string(char **inp, int *nonnull); 476 static int handle_dollar(o_string *dest, struct p_context *ctx, struct in_str *input); 477 #ifndef __U_BOOT__ 478 static int parse_string(o_string *dest, struct p_context *ctx, const char *src); 479 #endif 480 static int parse_stream(o_string *dest, struct p_context *ctx, struct in_str *input0, int end_trigger); 481 /* setup: */ 482 static int parse_stream_outer(struct in_str *inp, int flag); 483 #ifndef __U_BOOT__ 484 static int parse_string_outer(const char *s, int flag); 485 static int parse_file_outer(FILE *f); 486 #endif 487 #ifndef __U_BOOT__ 488 /* job management: */ 489 static int checkjobs(struct pipe* fg_pipe); 490 static void insert_bg_job(struct pipe *pi); 491 static void remove_bg_job(struct pipe *pi); 492 #endif 493 /* local variable support */ 494 static char **make_list_in(char **inp, char *name); 495 static char *insert_var_value(char *inp); 496 static char *insert_var_value_sub(char *inp, int tag_subst); 497 498 #ifndef __U_BOOT__ 499 /* Table of built-in functions. They can be forked or not, depending on 500 * context: within pipes, they fork. As simple commands, they do not. 501 * When used in non-forking context, they can change global variables 502 * in the parent shell process. If forked, of course they can not. 503 * For example, 'unset foo | whatever' will parse and run, but foo will 504 * still be set at the end. */ 505 static struct built_in_command bltins[] = { 506 {"bg", "Resume a job in the background", builtin_fg_bg}, 507 {"break", "Exit for, while or until loop", builtin_not_written}, 508 {"cd", "Change working directory", builtin_cd}, 509 {"continue", "Continue for, while or until loop", builtin_not_written}, 510 {"env", "Print all environment variables", builtin_env}, 511 {"eval", "Construct and run shell command", builtin_eval}, 512 {"exec", "Exec command, replacing this shell with the exec'd process", 513 builtin_exec}, 514 {"exit", "Exit from shell()", builtin_exit}, 515 {"export", "Set environment variable", builtin_export}, 516 {"fg", "Bring job into the foreground", builtin_fg_bg}, 517 {"jobs", "Lists the active jobs", builtin_jobs}, 518 {"pwd", "Print current directory", builtin_pwd}, 519 {"read", "Input environment variable", builtin_read}, 520 {"return", "Return from a function", builtin_not_written}, 521 {"set", "Set/unset shell local variables", builtin_set}, 522 {"shift", "Shift positional parameters", builtin_shift}, 523 {"trap", "Trap signals", builtin_not_written}, 524 {"ulimit","Controls resource limits", builtin_not_written}, 525 {"umask","Sets file creation mask", builtin_umask}, 526 {"unset", "Unset environment variable", builtin_unset}, 527 {".", "Source-in and run commands in a file", builtin_source}, 528 {"help", "List shell built-in commands", builtin_help}, 529 {NULL, NULL, NULL} 530 }; 531 532 static const char *set_cwd(void) 533 { 534 if(cwd==unknown) 535 cwd = NULL; /* xgetcwd(arg) called free(arg) */ 536 cwd = xgetcwd((char *)cwd); 537 if (!cwd) 538 cwd = unknown; 539 return cwd; 540 } 541 542 /* built-in 'eval' handler */ 543 static int builtin_eval(struct child_prog *child) 544 { 545 char *str = NULL; 546 int rcode = EXIT_SUCCESS; 547 548 if (child->argv[1]) { 549 str = make_string(child->argv + 1); 550 parse_string_outer(str, FLAG_EXIT_FROM_LOOP | 551 FLAG_PARSE_SEMICOLON); 552 free(str); 553 rcode = last_return_code; 554 } 555 return rcode; 556 } 557 558 /* built-in 'cd <path>' handler */ 559 static int builtin_cd(struct child_prog *child) 560 { 561 char *newdir; 562 if (child->argv[1] == NULL) 563 newdir = getenv("HOME"); 564 else 565 newdir = child->argv[1]; 566 if (chdir(newdir)) { 567 printf("cd: %s: %s\n", newdir, strerror(errno)); 568 return EXIT_FAILURE; 569 } 570 set_cwd(); 571 return EXIT_SUCCESS; 572 } 573 574 /* built-in 'env' handler */ 575 static int builtin_env(struct child_prog *dummy) 576 { 577 char **e = environ; 578 if (e == NULL) return EXIT_FAILURE; 579 for (; *e; e++) { 580 puts(*e); 581 } 582 return EXIT_SUCCESS; 583 } 584 585 /* built-in 'exec' handler */ 586 static int builtin_exec(struct child_prog *child) 587 { 588 if (child->argv[1] == NULL) 589 return EXIT_SUCCESS; /* Really? */ 590 child->argv++; 591 pseudo_exec(child); 592 /* never returns */ 593 } 594 595 /* built-in 'exit' handler */ 596 static int builtin_exit(struct child_prog *child) 597 { 598 if (child->argv[1] == NULL) 599 exit(last_return_code); 600 exit (atoi(child->argv[1])); 601 } 602 603 /* built-in 'export VAR=value' handler */ 604 static int builtin_export(struct child_prog *child) 605 { 606 int res = 0; 607 char *name = child->argv[1]; 608 609 if (name == NULL) { 610 return (builtin_env(child)); 611 } 612 613 name = strdup(name); 614 615 if(name) { 616 char *value = strchr(name, '='); 617 618 if (!value) { 619 char *tmp; 620 /* They are exporting something without an =VALUE */ 621 622 value = get_local_var(name); 623 if (value) { 624 size_t ln = strlen(name); 625 626 tmp = realloc(name, ln+strlen(value)+2); 627 if(tmp==NULL) 628 res = -1; 629 else { 630 sprintf(tmp+ln, "=%s", value); 631 name = tmp; 632 } 633 } else { 634 /* bash does not return an error when trying to export 635 * an undefined variable. Do likewise. */ 636 res = 1; 637 } 638 } 639 } 640 if (res<0) 641 perror_msg("export"); 642 else if(res==0) 643 res = set_local_var(name, 1); 644 else 645 res = 0; 646 free(name); 647 return res; 648 } 649 650 /* built-in 'fg' and 'bg' handler */ 651 static int builtin_fg_bg(struct child_prog *child) 652 { 653 int i, jobnum; 654 struct pipe *pi=NULL; 655 656 if (!interactive) 657 return EXIT_FAILURE; 658 /* If they gave us no args, assume they want the last backgrounded task */ 659 if (!child->argv[1]) { 660 for (pi = job_list; pi; pi = pi->next) { 661 if (pi->jobid == last_jobid) { 662 break; 663 } 664 } 665 if (!pi) { 666 error_msg("%s: no current job", child->argv[0]); 667 return EXIT_FAILURE; 668 } 669 } else { 670 if (sscanf(child->argv[1], "%%%d", &jobnum) != 1) { 671 error_msg("%s: bad argument '%s'", child->argv[0], child->argv[1]); 672 return EXIT_FAILURE; 673 } 674 for (pi = job_list; pi; pi = pi->next) { 675 if (pi->jobid == jobnum) { 676 break; 677 } 678 } 679 if (!pi) { 680 error_msg("%s: %d: no such job", child->argv[0], jobnum); 681 return EXIT_FAILURE; 682 } 683 } 684 685 if (*child->argv[0] == 'f') { 686 /* Put the job into the foreground. */ 687 tcsetpgrp(shell_terminal, pi->pgrp); 688 } 689 690 /* Restart the processes in the job */ 691 for (i = 0; i < pi->num_progs; i++) 692 pi->progs[i].is_stopped = 0; 693 694 if ( (i=kill(- pi->pgrp, SIGCONT)) < 0) { 695 if (i == ESRCH) { 696 remove_bg_job(pi); 697 } else { 698 perror_msg("kill (SIGCONT)"); 699 } 700 } 701 702 pi->stopped_progs = 0; 703 return EXIT_SUCCESS; 704 } 705 706 /* built-in 'help' handler */ 707 static int builtin_help(struct child_prog *dummy) 708 { 709 struct built_in_command *x; 710 711 printf("\nBuilt-in commands:\n"); 712 printf("-------------------\n"); 713 for (x = bltins; x->cmd; x++) { 714 if (x->descr==NULL) 715 continue; 716 printf("%s\t%s\n", x->cmd, x->descr); 717 } 718 printf("\n\n"); 719 return EXIT_SUCCESS; 720 } 721 722 /* built-in 'jobs' handler */ 723 static int builtin_jobs(struct child_prog *child) 724 { 725 struct pipe *job; 726 char *status_string; 727 728 for (job = job_list; job; job = job->next) { 729 if (job->running_progs == job->stopped_progs) 730 status_string = "Stopped"; 731 else 732 status_string = "Running"; 733 734 printf(JOB_STATUS_FORMAT, job->jobid, status_string, job->text); 735 } 736 return EXIT_SUCCESS; 737 } 738 739 740 /* built-in 'pwd' handler */ 741 static int builtin_pwd(struct child_prog *dummy) 742 { 743 puts(set_cwd()); 744 return EXIT_SUCCESS; 745 } 746 747 /* built-in 'read VAR' handler */ 748 static int builtin_read(struct child_prog *child) 749 { 750 int res; 751 752 if (child->argv[1]) { 753 char string[BUFSIZ]; 754 char *var = 0; 755 756 string[0] = 0; /* In case stdin has only EOF */ 757 /* read string */ 758 fgets(string, sizeof(string), stdin); 759 chomp(string); 760 var = malloc(strlen(child->argv[1])+strlen(string)+2); 761 if(var) { 762 sprintf(var, "%s=%s", child->argv[1], string); 763 res = set_local_var(var, 0); 764 } else 765 res = -1; 766 if (res) 767 fprintf(stderr, "read: %m\n"); 768 free(var); /* So not move up to avoid breaking errno */ 769 return res; 770 } else { 771 do res=getchar(); while(res!='\n' && res!=EOF); 772 return 0; 773 } 774 } 775 776 /* built-in 'set VAR=value' handler */ 777 static int builtin_set(struct child_prog *child) 778 { 779 char *temp = child->argv[1]; 780 struct variables *e; 781 782 if (temp == NULL) 783 for(e = top_vars; e; e=e->next) 784 printf("%s=%s\n", e->name, e->value); 785 else 786 set_local_var(temp, 0); 787 788 return EXIT_SUCCESS; 789 } 790 791 792 /* Built-in 'shift' handler */ 793 static int builtin_shift(struct child_prog *child) 794 { 795 int n=1; 796 if (child->argv[1]) { 797 n=atoi(child->argv[1]); 798 } 799 if (n>=0 && n<global_argc) { 800 /* XXX This probably breaks $0 */ 801 global_argc -= n; 802 global_argv += n; 803 return EXIT_SUCCESS; 804 } else { 805 return EXIT_FAILURE; 806 } 807 } 808 809 /* Built-in '.' handler (read-in and execute commands from file) */ 810 static int builtin_source(struct child_prog *child) 811 { 812 FILE *input; 813 int status; 814 815 if (child->argv[1] == NULL) 816 return EXIT_FAILURE; 817 818 /* XXX search through $PATH is missing */ 819 input = fopen(child->argv[1], "r"); 820 if (!input) { 821 error_msg("Couldn't open file '%s'", child->argv[1]); 822 return EXIT_FAILURE; 823 } 824 825 /* Now run the file */ 826 /* XXX argv and argc are broken; need to save old global_argv 827 * (pointer only is OK!) on this stack frame, 828 * set global_argv=child->argv+1, recurse, and restore. */ 829 mark_open(fileno(input)); 830 status = parse_file_outer(input); 831 mark_closed(fileno(input)); 832 fclose(input); 833 return (status); 834 } 835 836 static int builtin_umask(struct child_prog *child) 837 { 838 mode_t new_umask; 839 const char *arg = child->argv[1]; 840 char *end; 841 if (arg) { 842 new_umask=strtoul(arg, &end, 8); 843 if (*end!='\0' || end == arg) { 844 return EXIT_FAILURE; 845 } 846 } else { 847 printf("%.3o\n", (unsigned int) (new_umask=umask(0))); 848 } 849 umask(new_umask); 850 return EXIT_SUCCESS; 851 } 852 853 /* built-in 'unset VAR' handler */ 854 static int builtin_unset(struct child_prog *child) 855 { 856 /* bash returned already true */ 857 unset_local_var(child->argv[1]); 858 return EXIT_SUCCESS; 859 } 860 861 static int builtin_not_written(struct child_prog *child) 862 { 863 printf("builtin_%s not written\n",child->argv[0]); 864 return EXIT_FAILURE; 865 } 866 #endif 867 868 static int b_check_space(o_string *o, int len) 869 { 870 /* It would be easy to drop a more restrictive policy 871 * in here, such as setting a maximum string length */ 872 if (o->length + len > o->maxlen) { 873 char *old_data = o->data; 874 /* assert (data == NULL || o->maxlen != 0); */ 875 o->maxlen += max(2*len, B_CHUNK); 876 o->data = realloc(o->data, 1 + o->maxlen); 877 if (o->data == NULL) { 878 free(old_data); 879 } 880 } 881 return o->data == NULL; 882 } 883 884 static int b_addchr(o_string *o, int ch) 885 { 886 debug_printf("b_addchr: %c %d %p\n", ch, o->length, o); 887 if (b_check_space(o, 1)) return B_NOSPAC; 888 o->data[o->length] = ch; 889 o->length++; 890 o->data[o->length] = '\0'; 891 return 0; 892 } 893 894 static void b_reset(o_string *o) 895 { 896 o->length = 0; 897 o->nonnull = 0; 898 if (o->data != NULL) *o->data = '\0'; 899 } 900 901 static void b_free(o_string *o) 902 { 903 b_reset(o); 904 free(o->data); 905 o->data = NULL; 906 o->maxlen = 0; 907 } 908 909 /* My analysis of quoting semantics tells me that state information 910 * is associated with a destination, not a source. 911 */ 912 static int b_addqchr(o_string *o, int ch, int quote) 913 { 914 if (quote && strchr("*?[\\",ch)) { 915 int rc; 916 rc = b_addchr(o, '\\'); 917 if (rc) return rc; 918 } 919 return b_addchr(o, ch); 920 } 921 922 #ifndef __U_BOOT__ 923 static int b_adduint(o_string *o, unsigned int i) 924 { 925 int r; 926 char *p = simple_itoa(i); 927 /* no escape checking necessary */ 928 do r=b_addchr(o, *p++); while (r==0 && *p); 929 return r; 930 } 931 #endif 932 933 static int static_get(struct in_str *i) 934 { 935 int ch = *i->p++; 936 if (ch=='\0') return EOF; 937 return ch; 938 } 939 940 static int static_peek(struct in_str *i) 941 { 942 return *i->p; 943 } 944 945 #ifndef __U_BOOT__ 946 static inline void cmdedit_set_initial_prompt(void) 947 { 948 #ifndef CONFIG_FEATURE_SH_FANCY_PROMPT 949 PS1 = NULL; 950 #else 951 PS1 = getenv("PS1"); 952 if(PS1==0) 953 PS1 = "\\w \\$ "; 954 #endif 955 } 956 957 static inline void setup_prompt_string(int promptmode, char **prompt_str) 958 { 959 debug_printf("setup_prompt_string %d ",promptmode); 960 #ifndef CONFIG_FEATURE_SH_FANCY_PROMPT 961 /* Set up the prompt */ 962 if (promptmode == 1) { 963 free(PS1); 964 PS1=xmalloc(strlen(cwd)+4); 965 sprintf(PS1, "%s %s", cwd, ( geteuid() != 0 ) ? "$ ":"# "); 966 *prompt_str = PS1; 967 } else { 968 *prompt_str = PS2; 969 } 970 #else 971 *prompt_str = (promptmode==1)? PS1 : PS2; 972 #endif 973 debug_printf("result %s\n",*prompt_str); 974 } 975 #endif 976 977 #ifdef __U_BOOT__ 978 static int uboot_cli_readline(struct in_str *i) 979 { 980 char *prompt; 981 982 if (i->promptmode == 1) 983 prompt = CONFIG_SYS_PROMPT; 984 else 985 prompt = CONFIG_SYS_PROMPT_HUSH_PS2; 986 987 return cli_readline(prompt); 988 } 989 #endif 990 991 static void get_user_input(struct in_str *i) 992 { 993 #ifndef __U_BOOT__ 994 char *prompt_str; 995 static char the_command[BUFSIZ]; 996 997 setup_prompt_string(i->promptmode, &prompt_str); 998 #ifdef CONFIG_FEATURE_COMMAND_EDITING 999 /* 1000 ** enable command line editing only while a command line 1001 ** is actually being read; otherwise, we'll end up bequeathing 1002 ** atexit() handlers and other unwanted stuff to our 1003 ** child processes (rob@sysgo.de) 1004 */ 1005 cmdedit_read_input(prompt_str, the_command); 1006 #else 1007 fputs(prompt_str, stdout); 1008 fflush(stdout); 1009 the_command[0]=fgetc(i->file); 1010 the_command[1]='\0'; 1011 #endif 1012 fflush(stdout); 1013 i->p = the_command; 1014 #else 1015 int n; 1016 static char the_command[CONFIG_SYS_CBSIZE + 1]; 1017 1018 bootretry_reset_cmd_timeout(); 1019 i->__promptme = 1; 1020 n = uboot_cli_readline(i); 1021 1022 #ifdef CONFIG_BOOT_RETRY_TIME 1023 if (n == -2) { 1024 puts("\nTimeout waiting for command\n"); 1025 # ifdef CONFIG_RESET_TO_RETRY 1026 do_reset(NULL, 0, 0, NULL); 1027 # else 1028 # error "This currently only works with CONFIG_RESET_TO_RETRY enabled" 1029 # endif 1030 } 1031 #endif 1032 if (n == -1 ) { 1033 flag_repeat = 0; 1034 i->__promptme = 0; 1035 } 1036 n = strlen(console_buffer); 1037 console_buffer[n] = '\n'; 1038 console_buffer[n+1]= '\0'; 1039 if (had_ctrlc()) flag_repeat = 0; 1040 clear_ctrlc(); 1041 do_repeat = 0; 1042 if (i->promptmode == 1) { 1043 if (console_buffer[0] == '\n'&& flag_repeat == 0) { 1044 strcpy(the_command,console_buffer); 1045 } 1046 else { 1047 if (console_buffer[0] != '\n') { 1048 strcpy(the_command,console_buffer); 1049 flag_repeat = 1; 1050 } 1051 else { 1052 do_repeat = 1; 1053 } 1054 } 1055 i->p = the_command; 1056 } 1057 else { 1058 if (console_buffer[0] != '\n') { 1059 if (strlen(the_command) + strlen(console_buffer) 1060 < CONFIG_SYS_CBSIZE) { 1061 n = strlen(the_command); 1062 the_command[n-1] = ' '; 1063 strcpy(&the_command[n],console_buffer); 1064 } 1065 else { 1066 the_command[0] = '\n'; 1067 the_command[1] = '\0'; 1068 flag_repeat = 0; 1069 } 1070 } 1071 if (i->__promptme == 0) { 1072 the_command[0] = '\n'; 1073 the_command[1] = '\0'; 1074 } 1075 i->p = console_buffer; 1076 } 1077 #endif 1078 } 1079 1080 /* This is the magic location that prints prompts 1081 * and gets data back from the user */ 1082 static int file_get(struct in_str *i) 1083 { 1084 int ch; 1085 1086 ch = 0; 1087 /* If there is data waiting, eat it up */ 1088 if (i->p && *i->p) { 1089 ch = *i->p++; 1090 } else { 1091 /* need to double check i->file because we might be doing something 1092 * more complicated by now, like sourcing or substituting. */ 1093 #ifndef __U_BOOT__ 1094 if (i->__promptme && interactive && i->file == stdin) { 1095 while(! i->p || (interactive && strlen(i->p)==0) ) { 1096 #else 1097 while(! i->p || strlen(i->p)==0 ) { 1098 #endif 1099 get_user_input(i); 1100 } 1101 i->promptmode=2; 1102 #ifndef __U_BOOT__ 1103 i->__promptme = 0; 1104 #endif 1105 if (i->p && *i->p) { 1106 ch = *i->p++; 1107 } 1108 #ifndef __U_BOOT__ 1109 } else { 1110 ch = fgetc(i->file); 1111 } 1112 1113 #endif 1114 debug_printf("b_getch: got a %d\n", ch); 1115 } 1116 #ifndef __U_BOOT__ 1117 if (ch == '\n') i->__promptme=1; 1118 #endif 1119 return ch; 1120 } 1121 1122 /* All the callers guarantee this routine will never be 1123 * used right after a newline, so prompting is not needed. 1124 */ 1125 static int file_peek(struct in_str *i) 1126 { 1127 #ifndef __U_BOOT__ 1128 if (i->p && *i->p) { 1129 #endif 1130 return *i->p; 1131 #ifndef __U_BOOT__ 1132 } else { 1133 i->peek_buf[0] = fgetc(i->file); 1134 i->peek_buf[1] = '\0'; 1135 i->p = i->peek_buf; 1136 debug_printf("b_peek: got a %d\n", *i->p); 1137 return *i->p; 1138 } 1139 #endif 1140 } 1141 1142 #ifndef __U_BOOT__ 1143 static void setup_file_in_str(struct in_str *i, FILE *f) 1144 #else 1145 static void setup_file_in_str(struct in_str *i) 1146 #endif 1147 { 1148 i->peek = file_peek; 1149 i->get = file_get; 1150 i->__promptme=1; 1151 i->promptmode=1; 1152 #ifndef __U_BOOT__ 1153 i->file = f; 1154 #endif 1155 i->p = NULL; 1156 } 1157 1158 static void setup_string_in_str(struct in_str *i, const char *s) 1159 { 1160 i->peek = static_peek; 1161 i->get = static_get; 1162 i->__promptme=1; 1163 i->promptmode=1; 1164 i->p = s; 1165 } 1166 1167 #ifndef __U_BOOT__ 1168 static void mark_open(int fd) 1169 { 1170 struct close_me *new = xmalloc(sizeof(struct close_me)); 1171 new->fd = fd; 1172 new->next = close_me_head; 1173 close_me_head = new; 1174 } 1175 1176 static void mark_closed(int fd) 1177 { 1178 struct close_me *tmp; 1179 if (close_me_head == NULL || close_me_head->fd != fd) 1180 error_msg_and_die("corrupt close_me"); 1181 tmp = close_me_head; 1182 close_me_head = close_me_head->next; 1183 free(tmp); 1184 } 1185 1186 static void close_all(void) 1187 { 1188 struct close_me *c; 1189 for (c=close_me_head; c; c=c->next) { 1190 close(c->fd); 1191 } 1192 close_me_head = NULL; 1193 } 1194 1195 /* squirrel != NULL means we squirrel away copies of stdin, stdout, 1196 * and stderr if they are redirected. */ 1197 static int setup_redirects(struct child_prog *prog, int squirrel[]) 1198 { 1199 int openfd, mode; 1200 struct redir_struct *redir; 1201 1202 for (redir=prog->redirects; redir; redir=redir->next) { 1203 if (redir->dup == -1 && redir->word.gl_pathv == NULL) { 1204 /* something went wrong in the parse. Pretend it didn't happen */ 1205 continue; 1206 } 1207 if (redir->dup == -1) { 1208 mode=redir_table[redir->type].mode; 1209 openfd = open(redir->word.gl_pathv[0], mode, 0666); 1210 if (openfd < 0) { 1211 /* this could get lost if stderr has been redirected, but 1212 bash and ash both lose it as well (though zsh doesn't!) */ 1213 perror_msg("error opening %s", redir->word.gl_pathv[0]); 1214 return 1; 1215 } 1216 } else { 1217 openfd = redir->dup; 1218 } 1219 1220 if (openfd != redir->fd) { 1221 if (squirrel && redir->fd < 3) { 1222 squirrel[redir->fd] = dup(redir->fd); 1223 } 1224 if (openfd == -3) { 1225 close(openfd); 1226 } else { 1227 dup2(openfd, redir->fd); 1228 if (redir->dup == -1) 1229 close (openfd); 1230 } 1231 } 1232 } 1233 return 0; 1234 } 1235 1236 static void restore_redirects(int squirrel[]) 1237 { 1238 int i, fd; 1239 for (i=0; i<3; i++) { 1240 fd = squirrel[i]; 1241 if (fd != -1) { 1242 /* No error checking. I sure wouldn't know what 1243 * to do with an error if I found one! */ 1244 dup2(fd, i); 1245 close(fd); 1246 } 1247 } 1248 } 1249 1250 /* never returns */ 1251 /* XXX no exit() here. If you don't exec, use _exit instead. 1252 * The at_exit handlers apparently confuse the calling process, 1253 * in particular stdin handling. Not sure why? */ 1254 static void pseudo_exec(struct child_prog *child) 1255 { 1256 int i, rcode; 1257 char *p; 1258 struct built_in_command *x; 1259 if (child->argv) { 1260 for (i=0; is_assignment(child->argv[i]); i++) { 1261 debug_printf("pid %d environment modification: %s\n",getpid(),child->argv[i]); 1262 p = insert_var_value(child->argv[i]); 1263 putenv(strdup(p)); 1264 if (p != child->argv[i]) free(p); 1265 } 1266 child->argv+=i; /* XXX this hack isn't so horrible, since we are about 1267 to exit, and therefore don't need to keep data 1268 structures consistent for free() use. */ 1269 /* If a variable is assigned in a forest, and nobody listens, 1270 * was it ever really set? 1271 */ 1272 if (child->argv[0] == NULL) { 1273 _exit(EXIT_SUCCESS); 1274 } 1275 1276 /* 1277 * Check if the command matches any of the builtins. 1278 * Depending on context, this might be redundant. But it's 1279 * easier to waste a few CPU cycles than it is to figure out 1280 * if this is one of those cases. 1281 */ 1282 for (x = bltins; x->cmd; x++) { 1283 if (strcmp(child->argv[0], x->cmd) == 0 ) { 1284 debug_printf("builtin exec %s\n", child->argv[0]); 1285 rcode = x->function(child); 1286 fflush(stdout); 1287 _exit(rcode); 1288 } 1289 } 1290 1291 /* Check if the command matches any busybox internal commands 1292 * ("applets") here. 1293 * FIXME: This feature is not 100% safe, since 1294 * BusyBox is not fully reentrant, so we have no guarantee the things 1295 * from the .bss are still zeroed, or that things from .data are still 1296 * at their defaults. We could exec ourself from /proc/self/exe, but I 1297 * really dislike relying on /proc for things. We could exec ourself 1298 * from global_argv[0], but if we are in a chroot, we may not be able 1299 * to find ourself... */ 1300 #ifdef CONFIG_FEATURE_SH_STANDALONE_SHELL 1301 { 1302 int argc_l; 1303 char** argv_l=child->argv; 1304 char *name = child->argv[0]; 1305 1306 #ifdef CONFIG_FEATURE_SH_APPLETS_ALWAYS_WIN 1307 /* Following discussions from November 2000 on the busybox mailing 1308 * list, the default configuration, (without 1309 * get_last_path_component()) lets the user force use of an 1310 * external command by specifying the full (with slashes) filename. 1311 * If you enable CONFIG_FEATURE_SH_APPLETS_ALWAYS_WIN then applets 1312 * _aways_ override external commands, so if you want to run 1313 * /bin/cat, it will use BusyBox cat even if /bin/cat exists on the 1314 * filesystem and is _not_ busybox. Some systems may want this, 1315 * most do not. */ 1316 name = get_last_path_component(name); 1317 #endif 1318 /* Count argc for use in a second... */ 1319 for(argc_l=0;*argv_l!=NULL; argv_l++, argc_l++); 1320 optind = 1; 1321 debug_printf("running applet %s\n", name); 1322 run_applet_by_name(name, argc_l, child->argv); 1323 } 1324 #endif 1325 debug_printf("exec of %s\n",child->argv[0]); 1326 execvp(child->argv[0],child->argv); 1327 perror_msg("couldn't exec: %s",child->argv[0]); 1328 _exit(1); 1329 } else if (child->group) { 1330 debug_printf("runtime nesting to group\n"); 1331 interactive=0; /* crucial!!!! */ 1332 rcode = run_list_real(child->group); 1333 /* OK to leak memory by not calling free_pipe_list, 1334 * since this process is about to exit */ 1335 _exit(rcode); 1336 } else { 1337 /* Can happen. See what bash does with ">foo" by itself. */ 1338 debug_printf("trying to pseudo_exec null command\n"); 1339 _exit(EXIT_SUCCESS); 1340 } 1341 } 1342 1343 static void insert_bg_job(struct pipe *pi) 1344 { 1345 struct pipe *thejob; 1346 1347 /* Linear search for the ID of the job to use */ 1348 pi->jobid = 1; 1349 for (thejob = job_list; thejob; thejob = thejob->next) 1350 if (thejob->jobid >= pi->jobid) 1351 pi->jobid = thejob->jobid + 1; 1352 1353 /* add thejob to the list of running jobs */ 1354 if (!job_list) { 1355 thejob = job_list = xmalloc(sizeof(*thejob)); 1356 } else { 1357 for (thejob = job_list; thejob->next; thejob = thejob->next) /* nothing */; 1358 thejob->next = xmalloc(sizeof(*thejob)); 1359 thejob = thejob->next; 1360 } 1361 1362 /* physically copy the struct job */ 1363 memcpy(thejob, pi, sizeof(struct pipe)); 1364 thejob->next = NULL; 1365 thejob->running_progs = thejob->num_progs; 1366 thejob->stopped_progs = 0; 1367 thejob->text = xmalloc(BUFSIZ); /* cmdedit buffer size */ 1368 1369 /*if (pi->progs[0] && pi->progs[0].argv && pi->progs[0].argv[0]) */ 1370 { 1371 char *bar=thejob->text; 1372 char **foo=pi->progs[0].argv; 1373 while(foo && *foo) { 1374 bar += sprintf(bar, "%s ", *foo++); 1375 } 1376 } 1377 1378 /* we don't wait for background thejobs to return -- append it 1379 to the list of backgrounded thejobs and leave it alone */ 1380 printf("[%d] %d\n", thejob->jobid, thejob->progs[0].pid); 1381 last_bg_pid = thejob->progs[0].pid; 1382 last_jobid = thejob->jobid; 1383 } 1384 1385 /* remove a backgrounded job */ 1386 static void remove_bg_job(struct pipe *pi) 1387 { 1388 struct pipe *prev_pipe; 1389 1390 if (pi == job_list) { 1391 job_list = pi->next; 1392 } else { 1393 prev_pipe = job_list; 1394 while (prev_pipe->next != pi) 1395 prev_pipe = prev_pipe->next; 1396 prev_pipe->next = pi->next; 1397 } 1398 if (job_list) 1399 last_jobid = job_list->jobid; 1400 else 1401 last_jobid = 0; 1402 1403 pi->stopped_progs = 0; 1404 free_pipe(pi, 0); 1405 free(pi); 1406 } 1407 1408 /* Checks to see if any processes have exited -- if they 1409 have, figure out why and see if a job has completed */ 1410 static int checkjobs(struct pipe* fg_pipe) 1411 { 1412 int attributes; 1413 int status; 1414 int prognum = 0; 1415 struct pipe *pi; 1416 pid_t childpid; 1417 1418 attributes = WUNTRACED; 1419 if (fg_pipe==NULL) { 1420 attributes |= WNOHANG; 1421 } 1422 1423 while ((childpid = waitpid(-1, &status, attributes)) > 0) { 1424 if (fg_pipe) { 1425 int i, rcode = 0; 1426 for (i=0; i < fg_pipe->num_progs; i++) { 1427 if (fg_pipe->progs[i].pid == childpid) { 1428 if (i==fg_pipe->num_progs-1) 1429 rcode=WEXITSTATUS(status); 1430 (fg_pipe->num_progs)--; 1431 return(rcode); 1432 } 1433 } 1434 } 1435 1436 for (pi = job_list; pi; pi = pi->next) { 1437 prognum = 0; 1438 while (prognum < pi->num_progs && pi->progs[prognum].pid != childpid) { 1439 prognum++; 1440 } 1441 if (prognum < pi->num_progs) 1442 break; 1443 } 1444 1445 if(pi==NULL) { 1446 debug_printf("checkjobs: pid %d was not in our list!\n", childpid); 1447 continue; 1448 } 1449 1450 if (WIFEXITED(status) || WIFSIGNALED(status)) { 1451 /* child exited */ 1452 pi->running_progs--; 1453 pi->progs[prognum].pid = 0; 1454 1455 if (!pi->running_progs) { 1456 printf(JOB_STATUS_FORMAT, pi->jobid, "Done", pi->text); 1457 remove_bg_job(pi); 1458 } 1459 } else { 1460 /* child stopped */ 1461 pi->stopped_progs++; 1462 pi->progs[prognum].is_stopped = 1; 1463 1464 #if 0 1465 /* Printing this stuff is a pain, since it tends to 1466 * overwrite the prompt an inconveinient moments. So 1467 * don't do that. */ 1468 if (pi->stopped_progs == pi->num_progs) { 1469 printf("\n"JOB_STATUS_FORMAT, pi->jobid, "Stopped", pi->text); 1470 } 1471 #endif 1472 } 1473 } 1474 1475 if (childpid == -1 && errno != ECHILD) 1476 perror_msg("waitpid"); 1477 1478 /* move the shell to the foreground */ 1479 /*if (interactive && tcsetpgrp(shell_terminal, getpgid(0))) */ 1480 /* perror_msg("tcsetpgrp-2"); */ 1481 return -1; 1482 } 1483 1484 /* Figure out our controlling tty, checking in order stderr, 1485 * stdin, and stdout. If check_pgrp is set, also check that 1486 * we belong to the foreground process group associated with 1487 * that tty. The value of shell_terminal is needed in order to call 1488 * tcsetpgrp(shell_terminal, ...); */ 1489 void controlling_tty(int check_pgrp) 1490 { 1491 pid_t curpgrp; 1492 1493 if ((curpgrp = tcgetpgrp(shell_terminal = 2)) < 0 1494 && (curpgrp = tcgetpgrp(shell_terminal = 0)) < 0 1495 && (curpgrp = tcgetpgrp(shell_terminal = 1)) < 0) 1496 goto shell_terminal_error; 1497 1498 if (check_pgrp && curpgrp != getpgid(0)) 1499 goto shell_terminal_error; 1500 1501 return; 1502 1503 shell_terminal_error: 1504 shell_terminal = -1; 1505 return; 1506 } 1507 #endif 1508 1509 /* run_pipe_real() starts all the jobs, but doesn't wait for anything 1510 * to finish. See checkjobs(). 1511 * 1512 * return code is normally -1, when the caller has to wait for children 1513 * to finish to determine the exit status of the pipe. If the pipe 1514 * is a simple builtin command, however, the action is done by the 1515 * time run_pipe_real returns, and the exit code is provided as the 1516 * return value. 1517 * 1518 * The input of the pipe is always stdin, the output is always 1519 * stdout. The outpipe[] mechanism in BusyBox-0.48 lash is bogus, 1520 * because it tries to avoid running the command substitution in 1521 * subshell, when that is in fact necessary. The subshell process 1522 * now has its stdout directed to the input of the appropriate pipe, 1523 * so this routine is noticeably simpler. 1524 */ 1525 static int run_pipe_real(struct pipe *pi) 1526 { 1527 int i; 1528 #ifndef __U_BOOT__ 1529 int nextin, nextout; 1530 int pipefds[2]; /* pipefds[0] is for reading */ 1531 struct child_prog *child; 1532 struct built_in_command *x; 1533 char *p; 1534 # if __GNUC__ 1535 /* Avoid longjmp clobbering */ 1536 (void) &i; 1537 (void) &nextin; 1538 (void) &nextout; 1539 (void) &child; 1540 # endif 1541 #else 1542 int nextin; 1543 int flag = do_repeat ? CMD_FLAG_REPEAT : 0; 1544 struct child_prog *child; 1545 char *p; 1546 # if __GNUC__ 1547 /* Avoid longjmp clobbering */ 1548 (void) &i; 1549 (void) &nextin; 1550 (void) &child; 1551 # endif 1552 #endif /* __U_BOOT__ */ 1553 1554 nextin = 0; 1555 #ifndef __U_BOOT__ 1556 pi->pgrp = -1; 1557 #endif 1558 1559 /* Check if this is a simple builtin (not part of a pipe). 1560 * Builtins within pipes have to fork anyway, and are handled in 1561 * pseudo_exec. "echo foo | read bar" doesn't work on bash, either. 1562 */ 1563 if (pi->num_progs == 1) child = & (pi->progs[0]); 1564 #ifndef __U_BOOT__ 1565 if (pi->num_progs == 1 && child->group && child->subshell == 0) { 1566 int squirrel[] = {-1, -1, -1}; 1567 int rcode; 1568 debug_printf("non-subshell grouping\n"); 1569 setup_redirects(child, squirrel); 1570 /* XXX could we merge code with following builtin case, 1571 * by creating a pseudo builtin that calls run_list_real? */ 1572 rcode = run_list_real(child->group); 1573 restore_redirects(squirrel); 1574 #else 1575 if (pi->num_progs == 1 && child->group) { 1576 int rcode; 1577 debug_printf("non-subshell grouping\n"); 1578 rcode = run_list_real(child->group); 1579 #endif 1580 return rcode; 1581 } else if (pi->num_progs == 1 && pi->progs[0].argv != NULL) { 1582 for (i=0; is_assignment(child->argv[i]); i++) { /* nothing */ } 1583 if (i!=0 && child->argv[i]==NULL) { 1584 /* assignments, but no command: set the local environment */ 1585 for (i=0; child->argv[i]!=NULL; i++) { 1586 1587 /* Ok, this case is tricky. We have to decide if this is a 1588 * local variable, or an already exported variable. If it is 1589 * already exported, we have to export the new value. If it is 1590 * not exported, we need only set this as a local variable. 1591 * This junk is all to decide whether or not to export this 1592 * variable. */ 1593 int export_me=0; 1594 char *name, *value; 1595 name = xstrdup(child->argv[i]); 1596 debug_printf("Local environment set: %s\n", name); 1597 value = strchr(name, '='); 1598 if (value) 1599 *value=0; 1600 #ifndef __U_BOOT__ 1601 if ( get_local_var(name)) { 1602 export_me=1; 1603 } 1604 #endif 1605 free(name); 1606 p = insert_var_value(child->argv[i]); 1607 set_local_var(p, export_me); 1608 if (p != child->argv[i]) free(p); 1609 } 1610 return EXIT_SUCCESS; /* don't worry about errors in set_local_var() yet */ 1611 } 1612 for (i = 0; is_assignment(child->argv[i]); i++) { 1613 p = insert_var_value(child->argv[i]); 1614 #ifndef __U_BOOT__ 1615 putenv(strdup(p)); 1616 #else 1617 set_local_var(p, 0); 1618 #endif 1619 if (p != child->argv[i]) { 1620 child->sp--; 1621 free(p); 1622 } 1623 } 1624 if (child->sp) { 1625 char * str = NULL; 1626 1627 str = make_string(child->argv + i, 1628 child->argv_nonnull + i); 1629 parse_string_outer(str, FLAG_EXIT_FROM_LOOP | FLAG_REPARSING); 1630 free(str); 1631 return last_return_code; 1632 } 1633 #ifndef __U_BOOT__ 1634 for (x = bltins; x->cmd; x++) { 1635 if (strcmp(child->argv[i], x->cmd) == 0 ) { 1636 int squirrel[] = {-1, -1, -1}; 1637 int rcode; 1638 if (x->function == builtin_exec && child->argv[i+1]==NULL) { 1639 debug_printf("magic exec\n"); 1640 setup_redirects(child,NULL); 1641 return EXIT_SUCCESS; 1642 } 1643 debug_printf("builtin inline %s\n", child->argv[0]); 1644 /* XXX setup_redirects acts on file descriptors, not FILEs. 1645 * This is perfect for work that comes after exec(). 1646 * Is it really safe for inline use? Experimentally, 1647 * things seem to work with glibc. */ 1648 setup_redirects(child, squirrel); 1649 1650 child->argv += i; /* XXX horrible hack */ 1651 rcode = x->function(child); 1652 /* XXX restore hack so free() can work right */ 1653 child->argv -= i; 1654 restore_redirects(squirrel); 1655 } 1656 return rcode; 1657 } 1658 #else 1659 /* check ";", because ,example , argv consist from 1660 * "help;flinfo" must not execute 1661 */ 1662 if (strchr(child->argv[i], ';')) { 1663 printf("Unknown command '%s' - try 'help' or use " 1664 "'run' command\n", child->argv[i]); 1665 return -1; 1666 } 1667 /* Process the command */ 1668 return cmd_process(flag, child->argc, child->argv, 1669 &flag_repeat, NULL); 1670 #endif 1671 } 1672 #ifndef __U_BOOT__ 1673 1674 for (i = 0; i < pi->num_progs; i++) { 1675 child = & (pi->progs[i]); 1676 1677 /* pipes are inserted between pairs of commands */ 1678 if ((i + 1) < pi->num_progs) { 1679 if (pipe(pipefds)<0) perror_msg_and_die("pipe"); 1680 nextout = pipefds[1]; 1681 } else { 1682 nextout=1; 1683 pipefds[0] = -1; 1684 } 1685 1686 /* XXX test for failed fork()? */ 1687 if (!(child->pid = fork())) { 1688 /* Set the handling for job control signals back to the default. */ 1689 signal(SIGINT, SIG_DFL); 1690 signal(SIGQUIT, SIG_DFL); 1691 signal(SIGTERM, SIG_DFL); 1692 signal(SIGTSTP, SIG_DFL); 1693 signal(SIGTTIN, SIG_DFL); 1694 signal(SIGTTOU, SIG_DFL); 1695 signal(SIGCHLD, SIG_DFL); 1696 1697 close_all(); 1698 1699 if (nextin != 0) { 1700 dup2(nextin, 0); 1701 close(nextin); 1702 } 1703 if (nextout != 1) { 1704 dup2(nextout, 1); 1705 close(nextout); 1706 } 1707 if (pipefds[0]!=-1) { 1708 close(pipefds[0]); /* opposite end of our output pipe */ 1709 } 1710 1711 /* Like bash, explicit redirects override pipes, 1712 * and the pipe fd is available for dup'ing. */ 1713 setup_redirects(child,NULL); 1714 1715 if (interactive && pi->followup!=PIPE_BG) { 1716 /* If we (the child) win the race, put ourselves in the process 1717 * group whose leader is the first process in this pipe. */ 1718 if (pi->pgrp < 0) { 1719 pi->pgrp = getpid(); 1720 } 1721 if (setpgid(0, pi->pgrp) == 0) { 1722 tcsetpgrp(2, pi->pgrp); 1723 } 1724 } 1725 1726 pseudo_exec(child); 1727 } 1728 1729 1730 /* put our child in the process group whose leader is the 1731 first process in this pipe */ 1732 if (pi->pgrp < 0) { 1733 pi->pgrp = child->pid; 1734 } 1735 /* Don't check for errors. The child may be dead already, 1736 * in which case setpgid returns error code EACCES. */ 1737 setpgid(child->pid, pi->pgrp); 1738 1739 if (nextin != 0) 1740 close(nextin); 1741 if (nextout != 1) 1742 close(nextout); 1743 1744 /* If there isn't another process, nextin is garbage 1745 but it doesn't matter */ 1746 nextin = pipefds[0]; 1747 } 1748 #endif 1749 return -1; 1750 } 1751 1752 static int run_list_real(struct pipe *pi) 1753 { 1754 char *save_name = NULL; 1755 char **list = NULL; 1756 char **save_list = NULL; 1757 struct pipe *rpipe; 1758 int flag_rep = 0; 1759 #ifndef __U_BOOT__ 1760 int save_num_progs; 1761 #endif 1762 int rcode=0, flag_skip=1; 1763 int flag_restore = 0; 1764 int if_code=0, next_if_code=0; /* need double-buffer to handle elif */ 1765 reserved_style rmode, skip_more_in_this_rmode=RES_XXXX; 1766 /* check syntax for "for" */ 1767 for (rpipe = pi; rpipe; rpipe = rpipe->next) { 1768 if ((rpipe->r_mode == RES_IN || 1769 rpipe->r_mode == RES_FOR) && 1770 (rpipe->next == NULL)) { 1771 syntax(); 1772 #ifdef __U_BOOT__ 1773 flag_repeat = 0; 1774 #endif 1775 return 1; 1776 } 1777 if ((rpipe->r_mode == RES_IN && 1778 (rpipe->next->r_mode == RES_IN && 1779 rpipe->next->progs->argv != NULL))|| 1780 (rpipe->r_mode == RES_FOR && 1781 rpipe->next->r_mode != RES_IN)) { 1782 syntax(); 1783 #ifdef __U_BOOT__ 1784 flag_repeat = 0; 1785 #endif 1786 return 1; 1787 } 1788 } 1789 for (; pi; pi = (flag_restore != 0) ? rpipe : pi->next) { 1790 if (pi->r_mode == RES_WHILE || pi->r_mode == RES_UNTIL || 1791 pi->r_mode == RES_FOR) { 1792 #ifdef __U_BOOT__ 1793 /* check Ctrl-C */ 1794 ctrlc(); 1795 if ((had_ctrlc())) { 1796 return 1; 1797 } 1798 #endif 1799 flag_restore = 0; 1800 if (!rpipe) { 1801 flag_rep = 0; 1802 rpipe = pi; 1803 } 1804 } 1805 rmode = pi->r_mode; 1806 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); 1807 if (rmode == skip_more_in_this_rmode && flag_skip) { 1808 if (pi->followup == PIPE_SEQ) flag_skip=0; 1809 continue; 1810 } 1811 flag_skip = 1; 1812 skip_more_in_this_rmode = RES_XXXX; 1813 if (rmode == RES_THEN || rmode == RES_ELSE) if_code = next_if_code; 1814 if (rmode == RES_THEN && if_code) continue; 1815 if (rmode == RES_ELSE && !if_code) continue; 1816 if (rmode == RES_ELIF && !if_code) break; 1817 if (rmode == RES_FOR && pi->num_progs) { 1818 if (!list) { 1819 /* if no variable values after "in" we skip "for" */ 1820 if (!pi->next->progs->argv) continue; 1821 /* create list of variable values */ 1822 list = make_list_in(pi->next->progs->argv, 1823 pi->progs->argv[0]); 1824 save_list = list; 1825 save_name = pi->progs->argv[0]; 1826 pi->progs->argv[0] = NULL; 1827 flag_rep = 1; 1828 } 1829 if (!(*list)) { 1830 free(pi->progs->argv[0]); 1831 free(save_list); 1832 list = NULL; 1833 flag_rep = 0; 1834 pi->progs->argv[0] = save_name; 1835 #ifndef __U_BOOT__ 1836 pi->progs->glob_result.gl_pathv[0] = 1837 pi->progs->argv[0]; 1838 #endif 1839 continue; 1840 } else { 1841 /* insert new value from list for variable */ 1842 if (pi->progs->argv[0]) 1843 free(pi->progs->argv[0]); 1844 pi->progs->argv[0] = *list++; 1845 #ifndef __U_BOOT__ 1846 pi->progs->glob_result.gl_pathv[0] = 1847 pi->progs->argv[0]; 1848 #endif 1849 } 1850 } 1851 if (rmode == RES_IN) continue; 1852 if (rmode == RES_DO) { 1853 if (!flag_rep) continue; 1854 } 1855 if (rmode == RES_DONE) { 1856 if (flag_rep) { 1857 flag_restore = 1; 1858 } else { 1859 rpipe = NULL; 1860 } 1861 } 1862 if (pi->num_progs == 0) continue; 1863 #ifndef __U_BOOT__ 1864 save_num_progs = pi->num_progs; /* save number of programs */ 1865 #endif 1866 rcode = run_pipe_real(pi); 1867 debug_printf("run_pipe_real returned %d\n",rcode); 1868 #ifndef __U_BOOT__ 1869 if (rcode!=-1) { 1870 /* We only ran a builtin: rcode was set by the return value 1871 * of run_pipe_real(), and we don't need to wait for anything. */ 1872 } else if (pi->followup==PIPE_BG) { 1873 /* XXX check bash's behavior with nontrivial pipes */ 1874 /* XXX compute jobid */ 1875 /* XXX what does bash do with attempts to background builtins? */ 1876 insert_bg_job(pi); 1877 rcode = EXIT_SUCCESS; 1878 } else { 1879 if (interactive) { 1880 /* move the new process group into the foreground */ 1881 if (tcsetpgrp(shell_terminal, pi->pgrp) && errno != ENOTTY) 1882 perror_msg("tcsetpgrp-3"); 1883 rcode = checkjobs(pi); 1884 /* move the shell to the foreground */ 1885 if (tcsetpgrp(shell_terminal, getpgid(0)) && errno != ENOTTY) 1886 perror_msg("tcsetpgrp-4"); 1887 } else { 1888 rcode = checkjobs(pi); 1889 } 1890 debug_printf("checkjobs returned %d\n",rcode); 1891 } 1892 last_return_code=rcode; 1893 #else 1894 if (rcode < -1) { 1895 last_return_code = -rcode - 2; 1896 return -2; /* exit */ 1897 } 1898 last_return_code=(rcode == 0) ? 0 : 1; 1899 #endif 1900 #ifndef __U_BOOT__ 1901 pi->num_progs = save_num_progs; /* restore number of programs */ 1902 #endif 1903 if ( rmode == RES_IF || rmode == RES_ELIF ) 1904 next_if_code=rcode; /* can be overwritten a number of times */ 1905 if (rmode == RES_WHILE) 1906 flag_rep = !last_return_code; 1907 if (rmode == RES_UNTIL) 1908 flag_rep = last_return_code; 1909 if ( (rcode==EXIT_SUCCESS && pi->followup==PIPE_OR) || 1910 (rcode!=EXIT_SUCCESS && pi->followup==PIPE_AND) ) 1911 skip_more_in_this_rmode=rmode; 1912 #ifndef __U_BOOT__ 1913 checkjobs(NULL); 1914 #endif 1915 } 1916 return rcode; 1917 } 1918 1919 /* broken, of course, but OK for testing */ 1920 static char *indenter(int i) 1921 { 1922 static char blanks[]=" "; 1923 return &blanks[sizeof(blanks)-i-1]; 1924 } 1925 1926 /* return code is the exit status of the pipe */ 1927 static int free_pipe(struct pipe *pi, int indent) 1928 { 1929 char **p; 1930 struct child_prog *child; 1931 #ifndef __U_BOOT__ 1932 struct redir_struct *r, *rnext; 1933 #endif 1934 int a, i, ret_code=0; 1935 char *ind = indenter(indent); 1936 1937 #ifndef __U_BOOT__ 1938 if (pi->stopped_progs > 0) 1939 return ret_code; 1940 final_printf("%s run pipe: (pid %d)\n",ind,getpid()); 1941 #endif 1942 for (i=0; i<pi->num_progs; i++) { 1943 child = &pi->progs[i]; 1944 final_printf("%s command %d:\n",ind,i); 1945 if (child->argv) { 1946 for (a=0,p=child->argv; *p; a++,p++) { 1947 final_printf("%s argv[%d] = %s\n",ind,a,*p); 1948 } 1949 #ifndef __U_BOOT__ 1950 globfree(&child->glob_result); 1951 #else 1952 for (a = 0; a < child->argc; a++) { 1953 free(child->argv[a]); 1954 } 1955 free(child->argv); 1956 free(child->argv_nonnull); 1957 child->argc = 0; 1958 #endif 1959 child->argv=NULL; 1960 } else if (child->group) { 1961 #ifndef __U_BOOT__ 1962 final_printf("%s begin group (subshell:%d)\n",ind, child->subshell); 1963 #endif 1964 ret_code = free_pipe_list(child->group,indent+3); 1965 final_printf("%s end group\n",ind); 1966 } else { 1967 final_printf("%s (nil)\n",ind); 1968 } 1969 #ifndef __U_BOOT__ 1970 for (r=child->redirects; r; r=rnext) { 1971 final_printf("%s redirect %d%s", ind, r->fd, redir_table[r->type].descrip); 1972 if (r->dup == -1) { 1973 /* guard against the case >$FOO, where foo is unset or blank */ 1974 if (r->word.gl_pathv) { 1975 final_printf(" %s\n", *r->word.gl_pathv); 1976 globfree(&r->word); 1977 } 1978 } else { 1979 final_printf("&%d\n", r->dup); 1980 } 1981 rnext=r->next; 1982 free(r); 1983 } 1984 child->redirects=NULL; 1985 #endif 1986 } 1987 free(pi->progs); /* children are an array, they get freed all at once */ 1988 pi->progs=NULL; 1989 return ret_code; 1990 } 1991 1992 static int free_pipe_list(struct pipe *head, int indent) 1993 { 1994 int rcode=0; /* if list has no members */ 1995 struct pipe *pi, *next; 1996 char *ind = indenter(indent); 1997 for (pi=head; pi; pi=next) { 1998 final_printf("%s pipe reserved mode %d\n", ind, pi->r_mode); 1999 rcode = free_pipe(pi, indent); 2000 final_printf("%s pipe followup code %d\n", ind, pi->followup); 2001 next=pi->next; 2002 pi->next=NULL; 2003 free(pi); 2004 } 2005 return rcode; 2006 } 2007 2008 /* Select which version we will use */ 2009 static int run_list(struct pipe *pi) 2010 { 2011 int rcode=0; 2012 #ifndef __U_BOOT__ 2013 if (fake_mode==0) { 2014 #endif 2015 rcode = run_list_real(pi); 2016 #ifndef __U_BOOT__ 2017 } 2018 #endif 2019 /* free_pipe_list has the side effect of clearing memory 2020 * In the long run that function can be merged with run_list_real, 2021 * but doing that now would hobble the debugging effort. */ 2022 free_pipe_list(pi,0); 2023 return rcode; 2024 } 2025 2026 /* The API for glob is arguably broken. This routine pushes a non-matching 2027 * string into the output structure, removing non-backslashed backslashes. 2028 * If someone can prove me wrong, by performing this function within the 2029 * original glob(3) api, feel free to rewrite this routine into oblivion. 2030 * Return code (0 vs. GLOB_NOSPACE) matches glob(3). 2031 * XXX broken if the last character is '\\', check that before calling. 2032 */ 2033 #ifndef __U_BOOT__ 2034 static int globhack(const char *src, int flags, glob_t *pglob) 2035 { 2036 int cnt=0, pathc; 2037 const char *s; 2038 char *dest; 2039 for (cnt=1, s=src; s && *s; s++) { 2040 if (*s == '\\') s++; 2041 cnt++; 2042 } 2043 dest = malloc(cnt); 2044 if (!dest) return GLOB_NOSPACE; 2045 if (!(flags & GLOB_APPEND)) { 2046 pglob->gl_pathv=NULL; 2047 pglob->gl_pathc=0; 2048 pglob->gl_offs=0; 2049 pglob->gl_offs=0; 2050 } 2051 pathc = ++pglob->gl_pathc; 2052 pglob->gl_pathv = realloc(pglob->gl_pathv, (pathc+1)*sizeof(*pglob->gl_pathv)); 2053 if (pglob->gl_pathv == NULL) return GLOB_NOSPACE; 2054 pglob->gl_pathv[pathc-1]=dest; 2055 pglob->gl_pathv[pathc]=NULL; 2056 for (s=src; s && *s; s++, dest++) { 2057 if (*s == '\\') s++; 2058 *dest = *s; 2059 } 2060 *dest='\0'; 2061 return 0; 2062 } 2063 2064 /* XXX broken if the last character is '\\', check that before calling */ 2065 static int glob_needed(const char *s) 2066 { 2067 for (; *s; s++) { 2068 if (*s == '\\') s++; 2069 if (strchr("*[?",*s)) return 1; 2070 } 2071 return 0; 2072 } 2073 2074 #if 0 2075 static void globprint(glob_t *pglob) 2076 { 2077 int i; 2078 debug_printf("glob_t at %p:\n", pglob); 2079 debug_printf(" gl_pathc=%d gl_pathv=%p gl_offs=%d gl_flags=%d\n", 2080 pglob->gl_pathc, pglob->gl_pathv, pglob->gl_offs, pglob->gl_flags); 2081 for (i=0; i<pglob->gl_pathc; i++) 2082 debug_printf("pglob->gl_pathv[%d] = %p = %s\n", i, 2083 pglob->gl_pathv[i], pglob->gl_pathv[i]); 2084 } 2085 #endif 2086 2087 static int xglob(o_string *dest, int flags, glob_t *pglob) 2088 { 2089 int gr; 2090 2091 /* short-circuit for null word */ 2092 /* we can code this better when the debug_printf's are gone */ 2093 if (dest->length == 0) { 2094 if (dest->nonnull) { 2095 /* bash man page calls this an "explicit" null */ 2096 gr = globhack(dest->data, flags, pglob); 2097 debug_printf("globhack returned %d\n",gr); 2098 } else { 2099 return 0; 2100 } 2101 } else if (glob_needed(dest->data)) { 2102 gr = glob(dest->data, flags, NULL, pglob); 2103 debug_printf("glob returned %d\n",gr); 2104 if (gr == GLOB_NOMATCH) { 2105 /* quote removal, or more accurately, backslash removal */ 2106 gr = globhack(dest->data, flags, pglob); 2107 debug_printf("globhack returned %d\n",gr); 2108 } 2109 } else { 2110 gr = globhack(dest->data, flags, pglob); 2111 debug_printf("globhack returned %d\n",gr); 2112 } 2113 if (gr == GLOB_NOSPACE) 2114 error_msg_and_die("out of memory during glob"); 2115 if (gr != 0) { /* GLOB_ABORTED ? */ 2116 error_msg("glob(3) error %d",gr); 2117 } 2118 /* globprint(glob_target); */ 2119 return gr; 2120 } 2121 #endif 2122 2123 #ifdef __U_BOOT__ 2124 static char *get_dollar_var(char ch); 2125 #endif 2126 2127 /* This is used to get/check local shell variables */ 2128 char *get_local_var(const char *s) 2129 { 2130 struct variables *cur; 2131 2132 if (!s) 2133 return NULL; 2134 2135 #ifdef __U_BOOT__ 2136 if (*s == '$') 2137 return get_dollar_var(s[1]); 2138 #endif 2139 2140 for (cur = top_vars; cur; cur=cur->next) 2141 if(strcmp(cur->name, s)==0) 2142 return cur->value; 2143 return NULL; 2144 } 2145 2146 /* This is used to set local shell variables 2147 flg_export==0 if only local (not exporting) variable 2148 flg_export==1 if "new" exporting environ 2149 flg_export>1 if current startup environ (not call putenv()) */ 2150 int set_local_var(const char *s, int flg_export) 2151 { 2152 char *name, *value; 2153 int result=0; 2154 struct variables *cur; 2155 2156 #ifdef __U_BOOT__ 2157 /* might be possible! */ 2158 if (!isalpha(*s)) 2159 return -1; 2160 #endif 2161 2162 name=strdup(s); 2163 2164 #ifdef __U_BOOT__ 2165 if (getenv(name) != NULL) { 2166 printf ("ERROR: " 2167 "There is a global environment variable with the same name.\n"); 2168 free(name); 2169 return -1; 2170 } 2171 #endif 2172 /* Assume when we enter this function that we are already in 2173 * NAME=VALUE format. So the first order of business is to 2174 * split 's' on the '=' into 'name' and 'value' */ 2175 value = strchr(name, '='); 2176 if (value == NULL || *(value + 1) == 0) { 2177 free(name); 2178 return -1; 2179 } 2180 *value++ = 0; 2181 2182 for(cur = top_vars; cur; cur = cur->next) { 2183 if(strcmp(cur->name, name)==0) 2184 break; 2185 } 2186 2187 if(cur) { 2188 if(strcmp(cur->value, value)==0) { 2189 if(flg_export>0 && cur->flg_export==0) 2190 cur->flg_export=flg_export; 2191 else 2192 result++; 2193 } else { 2194 if(cur->flg_read_only) { 2195 error_msg("%s: readonly variable", name); 2196 result = -1; 2197 } else { 2198 if(flg_export>0 || cur->flg_export>1) 2199 cur->flg_export=1; 2200 free(cur->value); 2201 2202 cur->value = strdup(value); 2203 } 2204 } 2205 } else { 2206 cur = malloc(sizeof(struct variables)); 2207 if(!cur) { 2208 result = -1; 2209 } else { 2210 cur->name = strdup(name); 2211 if (cur->name == NULL) { 2212 free(cur); 2213 result = -1; 2214 } else { 2215 struct variables *bottom = top_vars; 2216 cur->value = strdup(value); 2217 cur->next = NULL; 2218 cur->flg_export = flg_export; 2219 cur->flg_read_only = 0; 2220 while(bottom->next) bottom=bottom->next; 2221 bottom->next = cur; 2222 } 2223 } 2224 } 2225 2226 #ifndef __U_BOOT__ 2227 if(result==0 && cur->flg_export==1) { 2228 *(value-1) = '='; 2229 result = putenv(name); 2230 } else { 2231 #endif 2232 free(name); 2233 #ifndef __U_BOOT__ 2234 if(result>0) /* equivalent to previous set */ 2235 result = 0; 2236 } 2237 #endif 2238 return result; 2239 } 2240 2241 void unset_local_var(const char *name) 2242 { 2243 struct variables *cur; 2244 2245 if (name) { 2246 for (cur = top_vars; cur; cur=cur->next) { 2247 if(strcmp(cur->name, name)==0) 2248 break; 2249 } 2250 if (cur != NULL) { 2251 struct variables *next = top_vars; 2252 if(cur->flg_read_only) { 2253 error_msg("%s: readonly variable", name); 2254 return; 2255 } else { 2256 #ifndef __U_BOOT__ 2257 if(cur->flg_export) 2258 unsetenv(cur->name); 2259 #endif 2260 free(cur->name); 2261 free(cur->value); 2262 while (next->next != cur) 2263 next = next->next; 2264 next->next = cur->next; 2265 } 2266 free(cur); 2267 } 2268 } 2269 } 2270 2271 static int is_assignment(const char *s) 2272 { 2273 if (s == NULL) 2274 return 0; 2275 2276 if (!isalpha(*s)) return 0; 2277 ++s; 2278 while(isalnum(*s) || *s=='_') ++s; 2279 return *s=='='; 2280 } 2281 2282 #ifndef __U_BOOT__ 2283 /* the src parameter allows us to peek forward to a possible &n syntax 2284 * for file descriptor duplication, e.g., "2>&1". 2285 * Return code is 0 normally, 1 if a syntax error is detected in src. 2286 * Resource errors (in xmalloc) cause the process to exit */ 2287 static int setup_redirect(struct p_context *ctx, int fd, redir_type style, 2288 struct in_str *input) 2289 { 2290 struct child_prog *child=ctx->child; 2291 struct redir_struct *redir = child->redirects; 2292 struct redir_struct *last_redir=NULL; 2293 2294 /* Create a new redir_struct and drop it onto the end of the linked list */ 2295 while(redir) { 2296 last_redir=redir; 2297 redir=redir->next; 2298 } 2299 redir = xmalloc(sizeof(struct redir_struct)); 2300 redir->next=NULL; 2301 redir->word.gl_pathv=NULL; 2302 if (last_redir) { 2303 last_redir->next=redir; 2304 } else { 2305 child->redirects=redir; 2306 } 2307 2308 redir->type=style; 2309 redir->fd= (fd==-1) ? redir_table[style].default_fd : fd ; 2310 2311 debug_printf("Redirect type %d%s\n", redir->fd, redir_table[style].descrip); 2312 2313 /* Check for a '2>&1' type redirect */ 2314 redir->dup = redirect_dup_num(input); 2315 if (redir->dup == -2) return 1; /* syntax error */ 2316 if (redir->dup != -1) { 2317 /* Erik had a check here that the file descriptor in question 2318 * is legit; I postpone that to "run time" 2319 * A "-" representation of "close me" shows up as a -3 here */ 2320 debug_printf("Duplicating redirect '%d>&%d'\n", redir->fd, redir->dup); 2321 } else { 2322 /* We do _not_ try to open the file that src points to, 2323 * since we need to return and let src be expanded first. 2324 * Set ctx->pending_redirect, so we know what to do at the 2325 * end of the next parsed word. 2326 */ 2327 ctx->pending_redirect = redir; 2328 } 2329 return 0; 2330 } 2331 #endif 2332 2333 static struct pipe *new_pipe(void) 2334 { 2335 struct pipe *pi; 2336 pi = xmalloc(sizeof(struct pipe)); 2337 pi->num_progs = 0; 2338 pi->progs = NULL; 2339 pi->next = NULL; 2340 pi->followup = 0; /* invalid */ 2341 pi->r_mode = RES_NONE; 2342 return pi; 2343 } 2344 2345 static void initialize_context(struct p_context *ctx) 2346 { 2347 ctx->pipe=NULL; 2348 #ifndef __U_BOOT__ 2349 ctx->pending_redirect=NULL; 2350 #endif 2351 ctx->child=NULL; 2352 ctx->list_head=new_pipe(); 2353 ctx->pipe=ctx->list_head; 2354 ctx->w=RES_NONE; 2355 ctx->stack=NULL; 2356 #ifdef __U_BOOT__ 2357 ctx->old_flag=0; 2358 #endif 2359 done_command(ctx); /* creates the memory for working child */ 2360 } 2361 2362 /* normal return is 0 2363 * if a reserved word is found, and processed, return 1 2364 * should handle if, then, elif, else, fi, for, while, until, do, done. 2365 * case, function, and select are obnoxious, save those for later. 2366 */ 2367 struct reserved_combo { 2368 char *literal; 2369 int code; 2370 long flag; 2371 }; 2372 /* Mostly a list of accepted follow-up reserved words. 2373 * FLAG_END means we are done with the sequence, and are ready 2374 * to turn the compound list into a command. 2375 * FLAG_START means the word must start a new compound list. 2376 */ 2377 static struct reserved_combo reserved_list[] = { 2378 { "if", RES_IF, FLAG_THEN | FLAG_START }, 2379 { "then", RES_THEN, FLAG_ELIF | FLAG_ELSE | FLAG_FI }, 2380 { "elif", RES_ELIF, FLAG_THEN }, 2381 { "else", RES_ELSE, FLAG_FI }, 2382 { "fi", RES_FI, FLAG_END }, 2383 { "for", RES_FOR, FLAG_IN | FLAG_START }, 2384 { "while", RES_WHILE, FLAG_DO | FLAG_START }, 2385 { "until", RES_UNTIL, FLAG_DO | FLAG_START }, 2386 { "in", RES_IN, FLAG_DO }, 2387 { "do", RES_DO, FLAG_DONE }, 2388 { "done", RES_DONE, FLAG_END } 2389 }; 2390 #define NRES (sizeof(reserved_list)/sizeof(struct reserved_combo)) 2391 2392 static int reserved_word(o_string *dest, struct p_context *ctx) 2393 { 2394 struct reserved_combo *r; 2395 for (r=reserved_list; 2396 r<reserved_list+NRES; r++) { 2397 if (strcmp(dest->data, r->literal) == 0) { 2398 debug_printf("found reserved word %s, code %d\n",r->literal,r->code); 2399 if (r->flag & FLAG_START) { 2400 struct p_context *new = xmalloc(sizeof(struct p_context)); 2401 debug_printf("push stack\n"); 2402 if (ctx->w == RES_IN || ctx->w == RES_FOR) { 2403 syntax(); 2404 free(new); 2405 ctx->w = RES_SNTX; 2406 b_reset(dest); 2407 return 1; 2408 } 2409 *new = *ctx; /* physical copy */ 2410 initialize_context(ctx); 2411 ctx->stack=new; 2412 } else if ( ctx->w == RES_NONE || ! (ctx->old_flag & (1<<r->code))) { 2413 syntax(); 2414 ctx->w = RES_SNTX; 2415 b_reset(dest); 2416 return 1; 2417 } 2418 ctx->w=r->code; 2419 ctx->old_flag = r->flag; 2420 if (ctx->old_flag & FLAG_END) { 2421 struct p_context *old; 2422 debug_printf("pop stack\n"); 2423 done_pipe(ctx,PIPE_SEQ); 2424 old = ctx->stack; 2425 old->child->group = ctx->list_head; 2426 #ifndef __U_BOOT__ 2427 old->child->subshell = 0; 2428 #endif 2429 *ctx = *old; /* physical copy */ 2430 free(old); 2431 } 2432 b_reset (dest); 2433 return 1; 2434 } 2435 } 2436 return 0; 2437 } 2438 2439 /* normal return is 0. 2440 * Syntax or xglob errors return 1. */ 2441 static int done_word(o_string *dest, struct p_context *ctx) 2442 { 2443 struct child_prog *child=ctx->child; 2444 #ifndef __U_BOOT__ 2445 glob_t *glob_target; 2446 int gr, flags = 0; 2447 #else 2448 char *str, *s; 2449 int argc, cnt; 2450 #endif 2451 2452 debug_printf("done_word: %s %p\n", dest->data, child); 2453 if (dest->length == 0 && !dest->nonnull) { 2454 debug_printf(" true null, ignored\n"); 2455 return 0; 2456 } 2457 #ifndef __U_BOOT__ 2458 if (ctx->pending_redirect) { 2459 glob_target = &ctx->pending_redirect->word; 2460 } else { 2461 #endif 2462 if (child->group) { 2463 syntax(); 2464 return 1; /* syntax error, groups and arglists don't mix */ 2465 } 2466 if (!child->argv && (ctx->type & FLAG_PARSE_SEMICOLON)) { 2467 debug_printf("checking %s for reserved-ness\n",dest->data); 2468 if (reserved_word(dest,ctx)) return ctx->w==RES_SNTX; 2469 } 2470 #ifndef __U_BOOT__ 2471 glob_target = &child->glob_result; 2472 if (child->argv) flags |= GLOB_APPEND; 2473 #else 2474 for (cnt = 1, s = dest->data; s && *s; s++) { 2475 if (*s == '\\') s++; 2476 cnt++; 2477 } 2478 str = malloc(cnt); 2479 if (!str) return 1; 2480 if ( child->argv == NULL) { 2481 child->argc=0; 2482 } 2483 argc = ++child->argc; 2484 child->argv = realloc(child->argv, (argc+1)*sizeof(*child->argv)); 2485 if (child->argv == NULL) { 2486 free(str); 2487 return 1; 2488 } 2489 child->argv_nonnull = realloc(child->argv_nonnull, 2490 (argc+1)*sizeof(*child->argv_nonnull)); 2491 if (child->argv_nonnull == NULL) { 2492 free(str); 2493 return 1; 2494 } 2495 child->argv[argc-1]=str; 2496 child->argv_nonnull[argc-1] = dest->nonnull; 2497 child->argv[argc]=NULL; 2498 child->argv_nonnull[argc] = 0; 2499 for (s = dest->data; s && *s; s++,str++) { 2500 if (*s == '\\') s++; 2501 *str = *s; 2502 } 2503 *str = '\0'; 2504 #endif 2505 #ifndef __U_BOOT__ 2506 } 2507 gr = xglob(dest, flags, glob_target); 2508 if (gr != 0) return 1; 2509 #endif 2510 2511 b_reset(dest); 2512 #ifndef __U_BOOT__ 2513 if (ctx->pending_redirect) { 2514 ctx->pending_redirect=NULL; 2515 if (glob_target->gl_pathc != 1) { 2516 error_msg("ambiguous redirect"); 2517 return 1; 2518 } 2519 } else { 2520 child->argv = glob_target->gl_pathv; 2521 } 2522 #endif 2523 if (ctx->w == RES_FOR) { 2524 done_word(dest,ctx); 2525 done_pipe(ctx,PIPE_SEQ); 2526 } 2527 return 0; 2528 } 2529 2530 /* The only possible error here is out of memory, in which case 2531 * xmalloc exits. */ 2532 static int done_command(struct p_context *ctx) 2533 { 2534 /* The child is really already in the pipe structure, so 2535 * advance the pipe counter and make a new, null child. 2536 * Only real trickiness here is that the uncommitted 2537 * child structure, to which ctx->child points, is not 2538 * counted in pi->num_progs. */ 2539 struct pipe *pi=ctx->pipe; 2540 struct child_prog *prog=ctx->child; 2541 2542 if (prog && prog->group == NULL 2543 && prog->argv == NULL 2544 #ifndef __U_BOOT__ 2545 && prog->redirects == NULL) { 2546 #else 2547 ) { 2548 #endif 2549 debug_printf("done_command: skipping null command\n"); 2550 return 0; 2551 } else if (prog) { 2552 pi->num_progs++; 2553 debug_printf("done_command: num_progs incremented to %d\n",pi->num_progs); 2554 } else { 2555 debug_printf("done_command: initializing\n"); 2556 } 2557 pi->progs = xrealloc(pi->progs, sizeof(*pi->progs) * (pi->num_progs+1)); 2558 2559 prog = pi->progs + pi->num_progs; 2560 #ifndef __U_BOOT__ 2561 prog->redirects = NULL; 2562 #endif 2563 prog->argv = NULL; 2564 prog->argv_nonnull = NULL; 2565 #ifndef __U_BOOT__ 2566 prog->is_stopped = 0; 2567 #endif 2568 prog->group = NULL; 2569 #ifndef __U_BOOT__ 2570 prog->glob_result.gl_pathv = NULL; 2571 prog->family = pi; 2572 #endif 2573 prog->sp = 0; 2574 ctx->child = prog; 2575 prog->type = ctx->type; 2576 2577 /* but ctx->pipe and ctx->list_head remain unchanged */ 2578 return 0; 2579 } 2580 2581 static int done_pipe(struct p_context *ctx, pipe_style type) 2582 { 2583 struct pipe *new_p; 2584 done_command(ctx); /* implicit closure of previous command */ 2585 debug_printf("done_pipe, type %d\n", type); 2586 ctx->pipe->followup = type; 2587 ctx->pipe->r_mode = ctx->w; 2588 new_p=new_pipe(); 2589 ctx->pipe->next = new_p; 2590 ctx->pipe = new_p; 2591 ctx->child = NULL; 2592 done_command(ctx); /* set up new pipe to accept commands */ 2593 return 0; 2594 } 2595 2596 #ifndef __U_BOOT__ 2597 /* peek ahead in the in_str to find out if we have a "&n" construct, 2598 * as in "2>&1", that represents duplicating a file descriptor. 2599 * returns either -2 (syntax error), -1 (no &), or the number found. 2600 */ 2601 static int redirect_dup_num(struct in_str *input) 2602 { 2603 int ch, d=0, ok=0; 2604 ch = b_peek(input); 2605 if (ch != '&') return -1; 2606 2607 b_getch(input); /* get the & */ 2608 ch=b_peek(input); 2609 if (ch == '-') { 2610 b_getch(input); 2611 return -3; /* "-" represents "close me" */ 2612 } 2613 while (isdigit(ch)) { 2614 d = d*10+(ch-'0'); 2615 ok=1; 2616 b_getch(input); 2617 ch = b_peek(input); 2618 } 2619 if (ok) return d; 2620 2621 error_msg("ambiguous redirect"); 2622 return -2; 2623 } 2624 2625 /* If a redirect is immediately preceded by a number, that number is 2626 * supposed to tell which file descriptor to redirect. This routine 2627 * looks for such preceding numbers. In an ideal world this routine 2628 * needs to handle all the following classes of redirects... 2629 * echo 2>foo # redirects fd 2 to file "foo", nothing passed to echo 2630 * echo 49>foo # redirects fd 49 to file "foo", nothing passed to echo 2631 * echo -2>foo # redirects fd 1 to file "foo", "-2" passed to echo 2632 * echo 49x>foo # redirects fd 1 to file "foo", "49x" passed to echo 2633 * A -1 output from this program means no valid number was found, so the 2634 * caller should use the appropriate default for this redirection. 2635 */ 2636 static int redirect_opt_num(o_string *o) 2637 { 2638 int num; 2639 2640 if (o->length==0) return -1; 2641 for(num=0; num<o->length; num++) { 2642 if (!isdigit(*(o->data+num))) { 2643 return -1; 2644 } 2645 } 2646 /* reuse num (and save an int) */ 2647 num=atoi(o->data); 2648 b_reset(o); 2649 return num; 2650 } 2651 2652 FILE *generate_stream_from_list(struct pipe *head) 2653 { 2654 FILE *pf; 2655 #if 1 2656 int pid, channel[2]; 2657 if (pipe(channel)<0) perror_msg_and_die("pipe"); 2658 pid=fork(); 2659 if (pid<0) { 2660 perror_msg_and_die("fork"); 2661 } else if (pid==0) { 2662 close(channel[0]); 2663 if (channel[1] != 1) { 2664 dup2(channel[1],1); 2665 close(channel[1]); 2666 } 2667 #if 0 2668 #define SURROGATE "surrogate response" 2669 write(1,SURROGATE,sizeof(SURROGATE)); 2670 _exit(run_list(head)); 2671 #else 2672 _exit(run_list_real(head)); /* leaks memory */ 2673 #endif 2674 } 2675 debug_printf("forked child %d\n",pid); 2676 close(channel[1]); 2677 pf = fdopen(channel[0],"r"); 2678 debug_printf("pipe on FILE *%p\n",pf); 2679 #else 2680 free_pipe_list(head,0); 2681 pf=popen("echo surrogate response","r"); 2682 debug_printf("started fake pipe on FILE *%p\n",pf); 2683 #endif 2684 return pf; 2685 } 2686 2687 /* this version hacked for testing purposes */ 2688 /* return code is exit status of the process that is run. */ 2689 static int process_command_subs(o_string *dest, struct p_context *ctx, struct in_str *input, int subst_end) 2690 { 2691 int retcode; 2692 o_string result=NULL_O_STRING; 2693 struct p_context inner; 2694 FILE *p; 2695 struct in_str pipe_str; 2696 initialize_context(&inner); 2697 2698 /* recursion to generate command */ 2699 retcode = parse_stream(&result, &inner, input, subst_end); 2700 if (retcode != 0) return retcode; /* syntax error or EOF */ 2701 done_word(&result, &inner); 2702 done_pipe(&inner, PIPE_SEQ); 2703 b_free(&result); 2704 2705 p=generate_stream_from_list(inner.list_head); 2706 if (p==NULL) return 1; 2707 mark_open(fileno(p)); 2708 setup_file_in_str(&pipe_str, p); 2709 2710 /* now send results of command back into original context */ 2711 retcode = parse_stream(dest, ctx, &pipe_str, '\0'); 2712 /* XXX In case of a syntax error, should we try to kill the child? 2713 * That would be tough to do right, so just read until EOF. */ 2714 if (retcode == 1) { 2715 while (b_getch(&pipe_str)!=EOF) { /* discard */ }; 2716 } 2717 2718 debug_printf("done reading from pipe, pclose()ing\n"); 2719 /* This is the step that wait()s for the child. Should be pretty 2720 * safe, since we just read an EOF from its stdout. We could try 2721 * to better, by using wait(), and keeping track of background jobs 2722 * at the same time. That would be a lot of work, and contrary 2723 * to the KISS philosophy of this program. */ 2724 mark_closed(fileno(p)); 2725 retcode=pclose(p); 2726 free_pipe_list(inner.list_head,0); 2727 debug_printf("pclosed, retcode=%d\n",retcode); 2728 /* XXX this process fails to trim a single trailing newline */ 2729 return retcode; 2730 } 2731 2732 static int parse_group(o_string *dest, struct p_context *ctx, 2733 struct in_str *input, int ch) 2734 { 2735 int rcode, endch=0; 2736 struct p_context sub; 2737 struct child_prog *child = ctx->child; 2738 if (child->argv) { 2739 syntax(); 2740 return 1; /* syntax error, groups and arglists don't mix */ 2741 } 2742 initialize_context(&sub); 2743 switch(ch) { 2744 case '(': endch=')'; child->subshell=1; break; 2745 case '{': endch='}'; break; 2746 default: syntax(); /* really logic error */ 2747 } 2748 rcode=parse_stream(dest,&sub,input,endch); 2749 done_word(dest,&sub); /* finish off the final word in the subcontext */ 2750 done_pipe(&sub, PIPE_SEQ); /* and the final command there, too */ 2751 child->group = sub.list_head; 2752 return rcode; 2753 /* child remains "open", available for possible redirects */ 2754 } 2755 #endif 2756 2757 /* basically useful version until someone wants to get fancier, 2758 * see the bash man page under "Parameter Expansion" */ 2759 static char *lookup_param(char *src) 2760 { 2761 char *p; 2762 char *sep; 2763 char *default_val = NULL; 2764 int assign = 0; 2765 int expand_empty = 0; 2766 2767 if (!src) 2768 return NULL; 2769 2770 sep = strchr(src, ':'); 2771 2772 if (sep) { 2773 *sep = '\0'; 2774 if (*(sep + 1) == '-') 2775 default_val = sep+2; 2776 if (*(sep + 1) == '=') { 2777 default_val = sep+2; 2778 assign = 1; 2779 } 2780 if (*(sep + 1) == '+') { 2781 default_val = sep+2; 2782 expand_empty = 1; 2783 } 2784 } 2785 2786 p = getenv(src); 2787 if (!p) 2788 p = get_local_var(src); 2789 2790 if (!p || strlen(p) == 0) { 2791 p = default_val; 2792 if (assign) { 2793 char *var = malloc(strlen(src)+strlen(default_val)+2); 2794 if (var) { 2795 sprintf(var, "%s=%s", src, default_val); 2796 set_local_var(var, 0); 2797 } 2798 free(var); 2799 } 2800 } else if (expand_empty) { 2801 p += strlen(p); 2802 } 2803 2804 if (sep) 2805 *sep = ':'; 2806 2807 return p; 2808 } 2809 2810 #ifdef __U_BOOT__ 2811 static char *get_dollar_var(char ch) 2812 { 2813 static char buf[40]; 2814 2815 buf[0] = '\0'; 2816 switch (ch) { 2817 case '?': 2818 sprintf(buf, "%u", (unsigned int)last_return_code); 2819 break; 2820 default: 2821 return NULL; 2822 } 2823 return buf; 2824 } 2825 #endif 2826 2827 /* return code: 0 for OK, 1 for syntax error */ 2828 static int handle_dollar(o_string *dest, struct p_context *ctx, struct in_str *input) 2829 { 2830 #ifndef __U_BOOT__ 2831 int i, advance=0; 2832 #else 2833 int advance=0; 2834 #endif 2835 #ifndef __U_BOOT__ 2836 char sep[]=" "; 2837 #endif 2838 int ch = input->peek(input); /* first character after the $ */ 2839 debug_printf("handle_dollar: ch=%c\n",ch); 2840 if (isalpha(ch)) { 2841 b_addchr(dest, SPECIAL_VAR_SYMBOL); 2842 ctx->child->sp++; 2843 while(ch=b_peek(input),isalnum(ch) || ch=='_') { 2844 b_getch(input); 2845 b_addchr(dest,ch); 2846 } 2847 b_addchr(dest, SPECIAL_VAR_SYMBOL); 2848 #ifndef __U_BOOT__ 2849 } else if (isdigit(ch)) { 2850 i = ch-'0'; /* XXX is $0 special? */ 2851 if (i<global_argc) { 2852 parse_string(dest, ctx, global_argv[i]); /* recursion */ 2853 } 2854 advance = 1; 2855 #endif 2856 } else switch (ch) { 2857 #ifndef __U_BOOT__ 2858 case '$': 2859 b_adduint(dest,getpid()); 2860 advance = 1; 2861 break; 2862 case '!': 2863 if (last_bg_pid > 0) b_adduint(dest, last_bg_pid); 2864 advance = 1; 2865 break; 2866 #endif 2867 case '?': 2868 #ifndef __U_BOOT__ 2869 b_adduint(dest,last_return_code); 2870 #else 2871 ctx->child->sp++; 2872 b_addchr(dest, SPECIAL_VAR_SYMBOL); 2873 b_addchr(dest, '$'); 2874 b_addchr(dest, '?'); 2875 b_addchr(dest, SPECIAL_VAR_SYMBOL); 2876 #endif 2877 advance = 1; 2878 break; 2879 #ifndef __U_BOOT__ 2880 case '#': 2881 b_adduint(dest,global_argc ? global_argc-1 : 0); 2882 advance = 1; 2883 break; 2884 #endif 2885 case '{': 2886 b_addchr(dest, SPECIAL_VAR_SYMBOL); 2887 ctx->child->sp++; 2888 b_getch(input); 2889 /* XXX maybe someone will try to escape the '}' */ 2890 while(ch=b_getch(input),ch!=EOF && ch!='}') { 2891 b_addchr(dest,ch); 2892 } 2893 if (ch != '}') { 2894 syntax(); 2895 return 1; 2896 } 2897 b_addchr(dest, SPECIAL_VAR_SYMBOL); 2898 break; 2899 #ifndef __U_BOOT__ 2900 case '(': 2901 b_getch(input); 2902 process_command_subs(dest, ctx, input, ')'); 2903 break; 2904 case '*': 2905 sep[0]=ifs[0]; 2906 for (i=1; i<global_argc; i++) { 2907 parse_string(dest, ctx, global_argv[i]); 2908 if (i+1 < global_argc) parse_string(dest, ctx, sep); 2909 } 2910 break; 2911 case '@': 2912 case '-': 2913 case '_': 2914 /* still unhandled, but should be eventually */ 2915 error_msg("unhandled syntax: $%c",ch); 2916 return 1; 2917 break; 2918 #endif 2919 default: 2920 b_addqchr(dest,'$',dest->quote); 2921 } 2922 /* Eat the character if the flag was set. If the compiler 2923 * is smart enough, we could substitute "b_getch(input);" 2924 * for all the "advance = 1;" above, and also end up with 2925 * a nice size-optimized program. Hah! That'll be the day. 2926 */ 2927 if (advance) b_getch(input); 2928 return 0; 2929 } 2930 2931 #ifndef __U_BOOT__ 2932 int parse_string(o_string *dest, struct p_context *ctx, const char *src) 2933 { 2934 struct in_str foo; 2935 setup_string_in_str(&foo, src); 2936 return parse_stream(dest, ctx, &foo, '\0'); 2937 } 2938 #endif 2939 2940 /* return code is 0 for normal exit, 1 for syntax error */ 2941 static int parse_stream(o_string *dest, struct p_context *ctx, 2942 struct in_str *input, int end_trigger) 2943 { 2944 unsigned int ch, m; 2945 #ifndef __U_BOOT__ 2946 int redir_fd; 2947 redir_type redir_style; 2948 #endif 2949 int next; 2950 2951 /* Only double-quote state is handled in the state variable dest->quote. 2952 * A single-quote triggers a bypass of the main loop until its mate is 2953 * found. When recursing, quote state is passed in via dest->quote. */ 2954 2955 debug_printf("parse_stream, end_trigger=%d\n",end_trigger); 2956 while ((ch=b_getch(input))!=EOF) { 2957 m = map[ch]; 2958 #ifdef __U_BOOT__ 2959 if (input->__promptme == 0) return 1; 2960 #endif 2961 next = (ch == '\n') ? 0 : b_peek(input); 2962 2963 debug_printf("parse_stream: ch=%c (%d) m=%d quote=%d - %c\n", 2964 ch >= ' ' ? ch : '.', ch, m, 2965 dest->quote, ctx->stack == NULL ? '*' : '.'); 2966 2967 if (m==0 || ((m==1 || m==2) && dest->quote)) { 2968 b_addqchr(dest, ch, dest->quote); 2969 } else { 2970 if (m==2) { /* unquoted IFS */ 2971 if (done_word(dest, ctx)) { 2972 return 1; 2973 } 2974 /* If we aren't performing a substitution, treat a newline as a 2975 * command separator. */ 2976 if (end_trigger != '\0' && ch=='\n') 2977 done_pipe(ctx,PIPE_SEQ); 2978 } 2979 if (ch == end_trigger && !dest->quote && ctx->w==RES_NONE) { 2980 debug_printf("leaving parse_stream (triggered)\n"); 2981 return 0; 2982 } 2983 #if 0 2984 if (ch=='\n') { 2985 /* Yahoo! Time to run with it! */ 2986 done_pipe(ctx,PIPE_SEQ); 2987 run_list(ctx->list_head); 2988 initialize_context(ctx); 2989 } 2990 #endif 2991 if (m!=2) switch (ch) { 2992 case '#': 2993 if (dest->length == 0 && !dest->quote) { 2994 while(ch=b_peek(input),ch!=EOF && ch!='\n') { b_getch(input); } 2995 } else { 2996 b_addqchr(dest, ch, dest->quote); 2997 } 2998 break; 2999 case '\\': 3000 if (next == EOF) { 3001 syntax(); 3002 return 1; 3003 } 3004 b_addqchr(dest, '\\', dest->quote); 3005 b_addqchr(dest, b_getch(input), dest->quote); 3006 break; 3007 case '$': 3008 if (handle_dollar(dest, ctx, input)!=0) return 1; 3009 break; 3010 case '\'': 3011 dest->nonnull = 1; 3012 while(ch=b_getch(input),ch!=EOF && ch!='\'') { 3013 #ifdef __U_BOOT__ 3014 if(input->__promptme == 0) return 1; 3015 #endif 3016 b_addchr(dest,ch); 3017 } 3018 if (ch==EOF) { 3019 syntax(); 3020 return 1; 3021 } 3022 break; 3023 case '"': 3024 dest->nonnull = 1; 3025 dest->quote = !dest->quote; 3026 break; 3027 #ifndef __U_BOOT__ 3028 case '`': 3029 process_command_subs(dest, ctx, input, '`'); 3030 break; 3031 case '>': 3032 redir_fd = redirect_opt_num(dest); 3033 done_word(dest, ctx); 3034 redir_style=REDIRECT_OVERWRITE; 3035 if (next == '>') { 3036 redir_style=REDIRECT_APPEND; 3037 b_getch(input); 3038 } else if (next == '(') { 3039 syntax(); /* until we support >(list) Process Substitution */ 3040 return 1; 3041 } 3042 setup_redirect(ctx, redir_fd, redir_style, input); 3043 break; 3044 case '<': 3045 redir_fd = redirect_opt_num(dest); 3046 done_word(dest, ctx); 3047 redir_style=REDIRECT_INPUT; 3048 if (next == '<') { 3049 redir_style=REDIRECT_HEREIS; 3050 b_getch(input); 3051 } else if (next == '>') { 3052 redir_style=REDIRECT_IO; 3053 b_getch(input); 3054 } else if (next == '(') { 3055 syntax(); /* until we support <(list) Process Substitution */ 3056 return 1; 3057 } 3058 setup_redirect(ctx, redir_fd, redir_style, input); 3059 break; 3060 #endif 3061 case ';': 3062 done_word(dest, ctx); 3063 done_pipe(ctx,PIPE_SEQ); 3064 break; 3065 case '&': 3066 done_word(dest, ctx); 3067 if (next=='&') { 3068 b_getch(input); 3069 done_pipe(ctx,PIPE_AND); 3070 } else { 3071 #ifndef __U_BOOT__ 3072 done_pipe(ctx,PIPE_BG); 3073 #else 3074 syntax_err(); 3075 return 1; 3076 #endif 3077 } 3078 break; 3079 case '|': 3080 done_word(dest, ctx); 3081 if (next=='|') { 3082 b_getch(input); 3083 done_pipe(ctx,PIPE_OR); 3084 } else { 3085 /* we could pick up a file descriptor choice here 3086 * with redirect_opt_num(), but bash doesn't do it. 3087 * "echo foo 2| cat" yields "foo 2". */ 3088 #ifndef __U_BOOT__ 3089 done_command(ctx); 3090 #else 3091 syntax_err(); 3092 return 1; 3093 #endif 3094 } 3095 break; 3096 #ifndef __U_BOOT__ 3097 case '(': 3098 case '{': 3099 if (parse_group(dest, ctx, input, ch)!=0) return 1; 3100 break; 3101 case ')': 3102 case '}': 3103 syntax(); /* Proper use of this character caught by end_trigger */ 3104 return 1; 3105 break; 3106 #endif 3107 case SUBSTED_VAR_SYMBOL: 3108 dest->nonnull = 1; 3109 while (ch = b_getch(input), ch != EOF && 3110 ch != SUBSTED_VAR_SYMBOL) { 3111 debug_printf("subst, pass=%d\n", ch); 3112 if (input->__promptme == 0) 3113 return 1; 3114 b_addchr(dest, ch); 3115 } 3116 debug_printf("subst, term=%d\n", ch); 3117 if (ch == EOF) { 3118 syntax(); 3119 return 1; 3120 } 3121 break; 3122 default: 3123 syntax(); /* this is really an internal logic error */ 3124 return 1; 3125 } 3126 } 3127 } 3128 /* complain if quote? No, maybe we just finished a command substitution 3129 * that was quoted. Example: 3130 * $ echo "`cat foo` plus more" 3131 * and we just got the EOF generated by the subshell that ran "cat foo" 3132 * The only real complaint is if we got an EOF when end_trigger != '\0', 3133 * that is, we were really supposed to get end_trigger, and never got 3134 * one before the EOF. Can't use the standard "syntax error" return code, 3135 * so that parse_stream_outer can distinguish the EOF and exit smoothly. */ 3136 debug_printf("leaving parse_stream (EOF)\n"); 3137 if (end_trigger != '\0') return -1; 3138 return 0; 3139 } 3140 3141 static void mapset(const unsigned char *set, int code) 3142 { 3143 const unsigned char *s; 3144 for (s=set; *s; s++) map[*s] = code; 3145 } 3146 3147 static void update_ifs_map(void) 3148 { 3149 /* char *ifs and char map[256] are both globals. */ 3150 ifs = (uchar *)getenv("IFS"); 3151 if (ifs == NULL) ifs=(uchar *)" \t\n"; 3152 /* Precompute a list of 'flow through' behavior so it can be treated 3153 * quickly up front. Computation is necessary because of IFS. 3154 * Special case handling of IFS == " \t\n" is not implemented. 3155 * The map[] array only really needs two bits each, and on most machines 3156 * that would be faster because of the reduced L1 cache footprint. 3157 */ 3158 memset(map,0,sizeof(map)); /* most characters flow through always */ 3159 #ifndef __U_BOOT__ 3160 mapset((uchar *)"\\$'\"`", 3); /* never flow through */ 3161 mapset((uchar *)"<>;&|(){}#", 1); /* flow through if quoted */ 3162 #else 3163 { 3164 uchar subst[2] = {SUBSTED_VAR_SYMBOL, 0}; 3165 mapset(subst, 3); /* never flow through */ 3166 } 3167 mapset((uchar *)"\\$'\"", 3); /* never flow through */ 3168 mapset((uchar *)";&|#", 1); /* flow through if quoted */ 3169 #endif 3170 mapset(ifs, 2); /* also flow through if quoted */ 3171 } 3172 3173 /* most recursion does not come through here, the exeception is 3174 * from builtin_source() */ 3175 static int parse_stream_outer(struct in_str *inp, int flag) 3176 { 3177 3178 struct p_context ctx; 3179 o_string temp=NULL_O_STRING; 3180 int rcode; 3181 #ifdef __U_BOOT__ 3182 int code = 1; 3183 #endif 3184 do { 3185 ctx.type = flag; 3186 initialize_context(&ctx); 3187 update_ifs_map(); 3188 if (!(flag & FLAG_PARSE_SEMICOLON) || (flag & FLAG_REPARSING)) mapset((uchar *)";$&|", 0); 3189 inp->promptmode=1; 3190 rcode = parse_stream(&temp, &ctx, inp, 3191 flag & FLAG_CONT_ON_NEWLINE ? -1 : '\n'); 3192 #ifdef __U_BOOT__ 3193 if (rcode == 1) flag_repeat = 0; 3194 #endif 3195 if (rcode != 1 && ctx.old_flag != 0) { 3196 syntax(); 3197 #ifdef __U_BOOT__ 3198 flag_repeat = 0; 3199 #endif 3200 } 3201 if (rcode != 1 && ctx.old_flag == 0) { 3202 done_word(&temp, &ctx); 3203 done_pipe(&ctx,PIPE_SEQ); 3204 #ifndef __U_BOOT__ 3205 run_list(ctx.list_head); 3206 #else 3207 code = run_list(ctx.list_head); 3208 if (code == -2) { /* exit */ 3209 b_free(&temp); 3210 code = 0; 3211 /* XXX hackish way to not allow exit from main loop */ 3212 if (inp->peek == file_peek) { 3213 printf("exit not allowed from main input shell.\n"); 3214 continue; 3215 } 3216 break; 3217 } 3218 if (code == -1) 3219 flag_repeat = 0; 3220 #endif 3221 } else { 3222 if (ctx.old_flag != 0) { 3223 free(ctx.stack); 3224 b_reset(&temp); 3225 } 3226 #ifdef __U_BOOT__ 3227 if (inp->__promptme == 0) printf("<INTERRUPT>\n"); 3228 inp->__promptme = 1; 3229 #endif 3230 temp.nonnull = 0; 3231 temp.quote = 0; 3232 inp->p = NULL; 3233 free_pipe_list(ctx.list_head,0); 3234 } 3235 b_free(&temp); 3236 /* loop on syntax errors, return on EOF */ 3237 } while (rcode != -1 && !(flag & FLAG_EXIT_FROM_LOOP) && 3238 (inp->peek != static_peek || b_peek(inp))); 3239 #ifndef __U_BOOT__ 3240 return 0; 3241 #else 3242 return (code != 0) ? 1 : 0; 3243 #endif /* __U_BOOT__ */ 3244 } 3245 3246 #ifndef __U_BOOT__ 3247 static int parse_string_outer(const char *s, int flag) 3248 #else 3249 int parse_string_outer(const char *s, int flag) 3250 #endif /* __U_BOOT__ */ 3251 { 3252 struct in_str input; 3253 #ifdef __U_BOOT__ 3254 char *p = NULL; 3255 int rcode; 3256 if (!s) 3257 return 1; 3258 if (!*s) 3259 return 0; 3260 if (!(p = strchr(s, '\n')) || *++p) { 3261 p = xmalloc(strlen(s) + 2); 3262 strcpy(p, s); 3263 strcat(p, "\n"); 3264 setup_string_in_str(&input, p); 3265 rcode = parse_stream_outer(&input, flag); 3266 free(p); 3267 return rcode; 3268 } else { 3269 #endif 3270 setup_string_in_str(&input, s); 3271 return parse_stream_outer(&input, flag); 3272 #ifdef __U_BOOT__ 3273 } 3274 #endif 3275 } 3276 3277 #ifndef __U_BOOT__ 3278 static int parse_file_outer(FILE *f) 3279 #else 3280 int parse_file_outer(void) 3281 #endif 3282 { 3283 int rcode; 3284 struct in_str input; 3285 #ifndef __U_BOOT__ 3286 setup_file_in_str(&input, f); 3287 #else 3288 setup_file_in_str(&input); 3289 #endif 3290 rcode = parse_stream_outer(&input, FLAG_PARSE_SEMICOLON); 3291 return rcode; 3292 } 3293 3294 #ifdef __U_BOOT__ 3295 #ifdef CONFIG_NEEDS_MANUAL_RELOC 3296 static void u_boot_hush_reloc(void) 3297 { 3298 unsigned long addr; 3299 struct reserved_combo *r; 3300 3301 for (r=reserved_list; r<reserved_list+NRES; r++) { 3302 addr = (ulong) (r->literal) + gd->reloc_off; 3303 r->literal = (char *)addr; 3304 } 3305 } 3306 #endif 3307 3308 int u_boot_hush_start(void) 3309 { 3310 if (top_vars == NULL) { 3311 top_vars = malloc(sizeof(struct variables)); 3312 top_vars->name = "HUSH_VERSION"; 3313 top_vars->value = "0.01"; 3314 top_vars->next = NULL; 3315 top_vars->flg_export = 0; 3316 top_vars->flg_read_only = 1; 3317 #ifdef CONFIG_NEEDS_MANUAL_RELOC 3318 u_boot_hush_reloc(); 3319 #endif 3320 } 3321 return 0; 3322 } 3323 3324 static void *xmalloc(size_t size) 3325 { 3326 void *p = NULL; 3327 3328 if (!(p = malloc(size))) { 3329 printf("ERROR : memory not allocated\n"); 3330 for(;;); 3331 } 3332 return p; 3333 } 3334 3335 static void *xrealloc(void *ptr, size_t size) 3336 { 3337 void *p = NULL; 3338 3339 if (!(p = realloc(ptr, size))) { 3340 printf("ERROR : memory not allocated\n"); 3341 for(;;); 3342 } 3343 return p; 3344 } 3345 #endif /* __U_BOOT__ */ 3346 3347 #ifndef __U_BOOT__ 3348 /* Make sure we have a controlling tty. If we get started under a job 3349 * aware app (like bash for example), make sure we are now in charge so 3350 * we don't fight over who gets the foreground */ 3351 static void setup_job_control(void) 3352 { 3353 static pid_t shell_pgrp; 3354 /* Loop until we are in the foreground. */ 3355 while (tcgetpgrp (shell_terminal) != (shell_pgrp = getpgrp ())) 3356 kill (- shell_pgrp, SIGTTIN); 3357 3358 /* Ignore interactive and job-control signals. */ 3359 signal(SIGINT, SIG_IGN); 3360 signal(SIGQUIT, SIG_IGN); 3361 signal(SIGTERM, SIG_IGN); 3362 signal(SIGTSTP, SIG_IGN); 3363 signal(SIGTTIN, SIG_IGN); 3364 signal(SIGTTOU, SIG_IGN); 3365 signal(SIGCHLD, SIG_IGN); 3366 3367 /* Put ourselves in our own process group. */ 3368 setsid(); 3369 shell_pgrp = getpid (); 3370 setpgid (shell_pgrp, shell_pgrp); 3371 3372 /* Grab control of the terminal. */ 3373 tcsetpgrp(shell_terminal, shell_pgrp); 3374 } 3375 3376 int hush_main(int argc, char * const *argv) 3377 { 3378 int opt; 3379 FILE *input; 3380 char **e = environ; 3381 3382 /* XXX what should these be while sourcing /etc/profile? */ 3383 global_argc = argc; 3384 global_argv = argv; 3385 3386 /* (re?) initialize globals. Sometimes hush_main() ends up calling 3387 * hush_main(), therefore we cannot rely on the BSS to zero out this 3388 * stuff. Reset these to 0 every time. */ 3389 ifs = NULL; 3390 /* map[] is taken care of with call to update_ifs_map() */ 3391 fake_mode = 0; 3392 interactive = 0; 3393 close_me_head = NULL; 3394 last_bg_pid = 0; 3395 job_list = NULL; 3396 last_jobid = 0; 3397 3398 /* Initialize some more globals to non-zero values */ 3399 set_cwd(); 3400 #ifdef CONFIG_FEATURE_COMMAND_EDITING 3401 cmdedit_set_initial_prompt(); 3402 #else 3403 PS1 = NULL; 3404 #endif 3405 PS2 = "> "; 3406 3407 /* initialize our shell local variables with the values 3408 * currently living in the environment */ 3409 if (e) { 3410 for (; *e; e++) 3411 set_local_var(*e, 2); /* without call putenv() */ 3412 } 3413 3414 last_return_code=EXIT_SUCCESS; 3415 3416 3417 if (argv[0] && argv[0][0] == '-') { 3418 debug_printf("\nsourcing /etc/profile\n"); 3419 if ((input = fopen("/etc/profile", "r")) != NULL) { 3420 mark_open(fileno(input)); 3421 parse_file_outer(input); 3422 mark_closed(fileno(input)); 3423 fclose(input); 3424 } 3425 } 3426 input=stdin; 3427 3428 while ((opt = getopt(argc, argv, "c:xif")) > 0) { 3429 switch (opt) { 3430 case 'c': 3431 { 3432 global_argv = argv+optind; 3433 global_argc = argc-optind; 3434 opt = parse_string_outer(optarg, FLAG_PARSE_SEMICOLON); 3435 goto final_return; 3436 } 3437 break; 3438 case 'i': 3439 interactive++; 3440 break; 3441 case 'f': 3442 fake_mode++; 3443 break; 3444 default: 3445 #ifndef BB_VER 3446 fprintf(stderr, "Usage: sh [FILE]...\n" 3447 " or: sh -c command [args]...\n\n"); 3448 exit(EXIT_FAILURE); 3449 #else 3450 show_usage(); 3451 #endif 3452 } 3453 } 3454 /* A shell is interactive if the `-i' flag was given, or if all of 3455 * the following conditions are met: 3456 * no -c command 3457 * no arguments remaining or the -s flag given 3458 * standard input is a terminal 3459 * standard output is a terminal 3460 * Refer to Posix.2, the description of the `sh' utility. */ 3461 if (argv[optind]==NULL && input==stdin && 3462 isatty(fileno(stdin)) && isatty(fileno(stdout))) { 3463 interactive++; 3464 } 3465 3466 debug_printf("\ninteractive=%d\n", interactive); 3467 if (interactive) { 3468 /* Looks like they want an interactive shell */ 3469 #ifndef CONFIG_FEATURE_SH_EXTRA_QUIET 3470 printf( "\n\n" BB_BANNER " hush - the humble shell v0.01 (testing)\n"); 3471 printf( "Enter 'help' for a list of built-in commands.\n\n"); 3472 #endif 3473 setup_job_control(); 3474 } 3475 3476 if (argv[optind]==NULL) { 3477 opt=parse_file_outer(stdin); 3478 goto final_return; 3479 } 3480 3481 debug_printf("\nrunning script '%s'\n", argv[optind]); 3482 global_argv = argv+optind; 3483 global_argc = argc-optind; 3484 input = xfopen(argv[optind], "r"); 3485 opt = parse_file_outer(input); 3486 3487 #ifdef CONFIG_FEATURE_CLEAN_UP 3488 fclose(input); 3489 if (cwd && cwd != unknown) 3490 free((char*)cwd); 3491 { 3492 struct variables *cur, *tmp; 3493 for(cur = top_vars; cur; cur = tmp) { 3494 tmp = cur->next; 3495 if (!cur->flg_read_only) { 3496 free(cur->name); 3497 free(cur->value); 3498 free(cur); 3499 } 3500 } 3501 } 3502 #endif 3503 3504 final_return: 3505 return(opt?opt:last_return_code); 3506 } 3507 #endif 3508 3509 static char *insert_var_value(char *inp) 3510 { 3511 return insert_var_value_sub(inp, 0); 3512 } 3513 3514 static char *insert_var_value_sub(char *inp, int tag_subst) 3515 { 3516 int res_str_len = 0; 3517 int len; 3518 int done = 0; 3519 char *p, *p1, *res_str = NULL; 3520 3521 while ((p = strchr(inp, SPECIAL_VAR_SYMBOL))) { 3522 /* check the beginning of the string for normal characters */ 3523 if (p != inp) { 3524 /* copy any characters to the result string */ 3525 len = p - inp; 3526 res_str = xrealloc(res_str, (res_str_len + len)); 3527 strncpy((res_str + res_str_len), inp, len); 3528 res_str_len += len; 3529 } 3530 inp = ++p; 3531 /* find the ending marker */ 3532 p = strchr(inp, SPECIAL_VAR_SYMBOL); 3533 *p = '\0'; 3534 /* look up the value to substitute */ 3535 if ((p1 = lookup_param(inp))) { 3536 if (tag_subst) 3537 len = res_str_len + strlen(p1) + 2; 3538 else 3539 len = res_str_len + strlen(p1); 3540 res_str = xrealloc(res_str, (1 + len)); 3541 if (tag_subst) { 3542 /* 3543 * copy the variable value to the result 3544 * string 3545 */ 3546 strcpy((res_str + res_str_len + 1), p1); 3547 3548 /* 3549 * mark the replaced text to be accepted as 3550 * is 3551 */ 3552 res_str[res_str_len] = SUBSTED_VAR_SYMBOL; 3553 res_str[res_str_len + 1 + strlen(p1)] = 3554 SUBSTED_VAR_SYMBOL; 3555 } else 3556 /* 3557 * copy the variable value to the result 3558 * string 3559 */ 3560 strcpy((res_str + res_str_len), p1); 3561 3562 res_str_len = len; 3563 } 3564 *p = SPECIAL_VAR_SYMBOL; 3565 inp = ++p; 3566 done = 1; 3567 } 3568 if (done) { 3569 res_str = xrealloc(res_str, (1 + res_str_len + strlen(inp))); 3570 strcpy((res_str + res_str_len), inp); 3571 while ((p = strchr(res_str, '\n'))) { 3572 *p = ' '; 3573 } 3574 } 3575 return (res_str == NULL) ? inp : res_str; 3576 } 3577 3578 static char **make_list_in(char **inp, char *name) 3579 { 3580 int len, i; 3581 int name_len = strlen(name); 3582 int n = 0; 3583 char **list; 3584 char *p1, *p2, *p3; 3585 3586 /* create list of variable values */ 3587 list = xmalloc(sizeof(*list)); 3588 for (i = 0; inp[i]; i++) { 3589 p3 = insert_var_value(inp[i]); 3590 p1 = p3; 3591 while (*p1) { 3592 if (*p1 == ' ') { 3593 p1++; 3594 continue; 3595 } 3596 if ((p2 = strchr(p1, ' '))) { 3597 len = p2 - p1; 3598 } else { 3599 len = strlen(p1); 3600 p2 = p1 + len; 3601 } 3602 /* we use n + 2 in realloc for list,because we add 3603 * new element and then we will add NULL element */ 3604 list = xrealloc(list, sizeof(*list) * (n + 2)); 3605 list[n] = xmalloc(2 + name_len + len); 3606 strcpy(list[n], name); 3607 strcat(list[n], "="); 3608 strncat(list[n], p1, len); 3609 list[n++][name_len + len + 1] = '\0'; 3610 p1 = p2; 3611 } 3612 if (p3 != inp[i]) free(p3); 3613 } 3614 list[n] = NULL; 3615 return list; 3616 } 3617 3618 /* 3619 * Make new string for parser 3620 * inp - array of argument strings to flatten 3621 * nonnull - indicates argument was quoted when originally parsed 3622 */ 3623 static char *make_string(char **inp, int *nonnull) 3624 { 3625 char *p; 3626 char *str = NULL; 3627 int n; 3628 int len = 2; 3629 char *noeval_str; 3630 int noeval = 0; 3631 3632 noeval_str = get_local_var("HUSH_NO_EVAL"); 3633 if (noeval_str != NULL && *noeval_str != '0' && *noeval_str != '\0') 3634 noeval = 1; 3635 for (n = 0; inp[n]; n++) { 3636 p = insert_var_value_sub(inp[n], noeval); 3637 str = xrealloc(str, (len + strlen(p) + (2 * nonnull[n]))); 3638 if (n) { 3639 strcat(str, " "); 3640 } else { 3641 *str = '\0'; 3642 } 3643 if (nonnull[n]) 3644 strcat(str, "'"); 3645 strcat(str, p); 3646 if (nonnull[n]) 3647 strcat(str, "'"); 3648 len = strlen(str) + 3; 3649 if (p != inp[n]) free(p); 3650 } 3651 len = strlen(str); 3652 *(str + len) = '\n'; 3653 *(str + len + 1) = '\0'; 3654 return str; 3655 } 3656 3657 #ifdef __U_BOOT__ 3658 static int do_showvar(cmd_tbl_t *cmdtp, int flag, int argc, 3659 char * const argv[]) 3660 { 3661 int i, k; 3662 int rcode = 0; 3663 struct variables *cur; 3664 3665 if (argc == 1) { /* Print all env variables */ 3666 for (cur = top_vars; cur; cur = cur->next) { 3667 printf ("%s=%s\n", cur->name, cur->value); 3668 if (ctrlc ()) { 3669 puts ("\n ** Abort\n"); 3670 return 1; 3671 } 3672 } 3673 return 0; 3674 } 3675 for (i = 1; i < argc; ++i) { /* print single env variables */ 3676 char *name = argv[i]; 3677 3678 k = -1; 3679 for (cur = top_vars; cur; cur = cur->next) { 3680 if(strcmp (cur->name, name) == 0) { 3681 k = 0; 3682 printf ("%s=%s\n", cur->name, cur->value); 3683 } 3684 if (ctrlc ()) { 3685 puts ("\n ** Abort\n"); 3686 return 1; 3687 } 3688 } 3689 if (k < 0) { 3690 printf ("## Error: \"%s\" not defined\n", name); 3691 rcode ++; 3692 } 3693 } 3694 return rcode; 3695 } 3696 3697 U_BOOT_CMD( 3698 showvar, CONFIG_SYS_MAXARGS, 1, do_showvar, 3699 "print local hushshell variables", 3700 "\n - print values of all hushshell variables\n" 3701 "showvar name ...\n" 3702 " - print value of hushshell variable 'name'" 3703 ); 3704 3705 #endif 3706 /****************************************************************************/ 3707