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 = env_get("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 = env_get("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 char __maybe_unused *ps_prompt = NULL; 982 983 if (i->promptmode == 1) 984 prompt = CONFIG_SYS_PROMPT; 985 else 986 prompt = CONFIG_SYS_PROMPT_HUSH_PS2; 987 988 #ifdef CONFIG_CMDLINE_PS_SUPPORT 989 if (i->promptmode == 1) 990 ps_prompt = env_get("PS1"); 991 else 992 ps_prompt = env_get("PS2"); 993 if (ps_prompt) 994 prompt = ps_prompt; 995 #endif 996 997 return cli_readline(prompt); 998 } 999 #endif 1000 1001 static void get_user_input(struct in_str *i) 1002 { 1003 #ifndef __U_BOOT__ 1004 char *prompt_str; 1005 static char the_command[BUFSIZ]; 1006 1007 setup_prompt_string(i->promptmode, &prompt_str); 1008 #ifdef CONFIG_FEATURE_COMMAND_EDITING 1009 /* 1010 ** enable command line editing only while a command line 1011 ** is actually being read; otherwise, we'll end up bequeathing 1012 ** atexit() handlers and other unwanted stuff to our 1013 ** child processes (rob@sysgo.de) 1014 */ 1015 cmdedit_read_input(prompt_str, the_command); 1016 #else 1017 fputs(prompt_str, stdout); 1018 fflush(stdout); 1019 the_command[0]=fgetc(i->file); 1020 the_command[1]='\0'; 1021 #endif 1022 fflush(stdout); 1023 i->p = the_command; 1024 #else 1025 int n; 1026 static char the_command[CONFIG_SYS_CBSIZE + 1]; 1027 1028 bootretry_reset_cmd_timeout(); 1029 i->__promptme = 1; 1030 n = uboot_cli_readline(i); 1031 1032 #ifdef CONFIG_BOOT_RETRY_TIME 1033 if (n == -2) { 1034 puts("\nTimeout waiting for command\n"); 1035 # ifdef CONFIG_RESET_TO_RETRY 1036 do_reset(NULL, 0, 0, NULL); 1037 # else 1038 # error "This currently only works with CONFIG_RESET_TO_RETRY enabled" 1039 # endif 1040 } 1041 #endif 1042 if (n == -1 ) { 1043 flag_repeat = 0; 1044 i->__promptme = 0; 1045 } 1046 n = strlen(console_buffer); 1047 console_buffer[n] = '\n'; 1048 console_buffer[n+1]= '\0'; 1049 if (had_ctrlc()) flag_repeat = 0; 1050 clear_ctrlc(); 1051 do_repeat = 0; 1052 if (i->promptmode == 1) { 1053 if (console_buffer[0] == '\n'&& flag_repeat == 0) { 1054 strcpy(the_command,console_buffer); 1055 } 1056 else { 1057 if (console_buffer[0] != '\n') { 1058 strcpy(the_command,console_buffer); 1059 flag_repeat = 1; 1060 } 1061 else { 1062 do_repeat = 1; 1063 } 1064 } 1065 i->p = the_command; 1066 } 1067 else { 1068 if (console_buffer[0] != '\n') { 1069 if (strlen(the_command) + strlen(console_buffer) 1070 < CONFIG_SYS_CBSIZE) { 1071 n = strlen(the_command); 1072 the_command[n-1] = ' '; 1073 strcpy(&the_command[n],console_buffer); 1074 } 1075 else { 1076 the_command[0] = '\n'; 1077 the_command[1] = '\0'; 1078 flag_repeat = 0; 1079 } 1080 } 1081 if (i->__promptme == 0) { 1082 the_command[0] = '\n'; 1083 the_command[1] = '\0'; 1084 } 1085 i->p = console_buffer; 1086 } 1087 #endif 1088 } 1089 1090 /* This is the magic location that prints prompts 1091 * and gets data back from the user */ 1092 static int file_get(struct in_str *i) 1093 { 1094 int ch; 1095 1096 ch = 0; 1097 /* If there is data waiting, eat it up */ 1098 if (i->p && *i->p) { 1099 ch = *i->p++; 1100 } else { 1101 /* need to double check i->file because we might be doing something 1102 * more complicated by now, like sourcing or substituting. */ 1103 #ifndef __U_BOOT__ 1104 if (i->__promptme && interactive && i->file == stdin) { 1105 while(! i->p || (interactive && strlen(i->p)==0) ) { 1106 #else 1107 while(! i->p || strlen(i->p)==0 ) { 1108 #endif 1109 get_user_input(i); 1110 } 1111 i->promptmode=2; 1112 #ifndef __U_BOOT__ 1113 i->__promptme = 0; 1114 #endif 1115 if (i->p && *i->p) { 1116 ch = *i->p++; 1117 } 1118 #ifndef __U_BOOT__ 1119 } else { 1120 ch = fgetc(i->file); 1121 } 1122 1123 #endif 1124 debug_printf("b_getch: got a %d\n", ch); 1125 } 1126 #ifndef __U_BOOT__ 1127 if (ch == '\n') i->__promptme=1; 1128 #endif 1129 return ch; 1130 } 1131 1132 /* All the callers guarantee this routine will never be 1133 * used right after a newline, so prompting is not needed. 1134 */ 1135 static int file_peek(struct in_str *i) 1136 { 1137 #ifndef __U_BOOT__ 1138 if (i->p && *i->p) { 1139 #endif 1140 return *i->p; 1141 #ifndef __U_BOOT__ 1142 } else { 1143 i->peek_buf[0] = fgetc(i->file); 1144 i->peek_buf[1] = '\0'; 1145 i->p = i->peek_buf; 1146 debug_printf("b_peek: got a %d\n", *i->p); 1147 return *i->p; 1148 } 1149 #endif 1150 } 1151 1152 #ifndef __U_BOOT__ 1153 static void setup_file_in_str(struct in_str *i, FILE *f) 1154 #else 1155 static void setup_file_in_str(struct in_str *i) 1156 #endif 1157 { 1158 i->peek = file_peek; 1159 i->get = file_get; 1160 i->__promptme=1; 1161 i->promptmode=1; 1162 #ifndef __U_BOOT__ 1163 i->file = f; 1164 #endif 1165 i->p = NULL; 1166 } 1167 1168 static void setup_string_in_str(struct in_str *i, const char *s) 1169 { 1170 i->peek = static_peek; 1171 i->get = static_get; 1172 i->__promptme=1; 1173 i->promptmode=1; 1174 i->p = s; 1175 } 1176 1177 #ifndef __U_BOOT__ 1178 static void mark_open(int fd) 1179 { 1180 struct close_me *new = xmalloc(sizeof(struct close_me)); 1181 new->fd = fd; 1182 new->next = close_me_head; 1183 close_me_head = new; 1184 } 1185 1186 static void mark_closed(int fd) 1187 { 1188 struct close_me *tmp; 1189 if (close_me_head == NULL || close_me_head->fd != fd) 1190 error_msg_and_die("corrupt close_me"); 1191 tmp = close_me_head; 1192 close_me_head = close_me_head->next; 1193 free(tmp); 1194 } 1195 1196 static void close_all(void) 1197 { 1198 struct close_me *c; 1199 for (c=close_me_head; c; c=c->next) { 1200 close(c->fd); 1201 } 1202 close_me_head = NULL; 1203 } 1204 1205 /* squirrel != NULL means we squirrel away copies of stdin, stdout, 1206 * and stderr if they are redirected. */ 1207 static int setup_redirects(struct child_prog *prog, int squirrel[]) 1208 { 1209 int openfd, mode; 1210 struct redir_struct *redir; 1211 1212 for (redir=prog->redirects; redir; redir=redir->next) { 1213 if (redir->dup == -1 && redir->word.gl_pathv == NULL) { 1214 /* something went wrong in the parse. Pretend it didn't happen */ 1215 continue; 1216 } 1217 if (redir->dup == -1) { 1218 mode=redir_table[redir->type].mode; 1219 openfd = open(redir->word.gl_pathv[0], mode, 0666); 1220 if (openfd < 0) { 1221 /* this could get lost if stderr has been redirected, but 1222 bash and ash both lose it as well (though zsh doesn't!) */ 1223 perror_msg("error opening %s", redir->word.gl_pathv[0]); 1224 return 1; 1225 } 1226 } else { 1227 openfd = redir->dup; 1228 } 1229 1230 if (openfd != redir->fd) { 1231 if (squirrel && redir->fd < 3) { 1232 squirrel[redir->fd] = dup(redir->fd); 1233 } 1234 if (openfd == -3) { 1235 close(openfd); 1236 } else { 1237 dup2(openfd, redir->fd); 1238 if (redir->dup == -1) 1239 close (openfd); 1240 } 1241 } 1242 } 1243 return 0; 1244 } 1245 1246 static void restore_redirects(int squirrel[]) 1247 { 1248 int i, fd; 1249 for (i=0; i<3; i++) { 1250 fd = squirrel[i]; 1251 if (fd != -1) { 1252 /* No error checking. I sure wouldn't know what 1253 * to do with an error if I found one! */ 1254 dup2(fd, i); 1255 close(fd); 1256 } 1257 } 1258 } 1259 1260 /* never returns */ 1261 /* XXX no exit() here. If you don't exec, use _exit instead. 1262 * The at_exit handlers apparently confuse the calling process, 1263 * in particular stdin handling. Not sure why? */ 1264 static void pseudo_exec(struct child_prog *child) 1265 { 1266 int i, rcode; 1267 char *p; 1268 struct built_in_command *x; 1269 if (child->argv) { 1270 for (i=0; is_assignment(child->argv[i]); i++) { 1271 debug_printf("pid %d environment modification: %s\n",getpid(),child->argv[i]); 1272 p = insert_var_value(child->argv[i]); 1273 putenv(strdup(p)); 1274 if (p != child->argv[i]) free(p); 1275 } 1276 child->argv+=i; /* XXX this hack isn't so horrible, since we are about 1277 to exit, and therefore don't need to keep data 1278 structures consistent for free() use. */ 1279 /* If a variable is assigned in a forest, and nobody listens, 1280 * was it ever really set? 1281 */ 1282 if (child->argv[0] == NULL) { 1283 _exit(EXIT_SUCCESS); 1284 } 1285 1286 /* 1287 * Check if the command matches any of the builtins. 1288 * Depending on context, this might be redundant. But it's 1289 * easier to waste a few CPU cycles than it is to figure out 1290 * if this is one of those cases. 1291 */ 1292 for (x = bltins; x->cmd; x++) { 1293 if (strcmp(child->argv[0], x->cmd) == 0 ) { 1294 debug_printf("builtin exec %s\n", child->argv[0]); 1295 rcode = x->function(child); 1296 fflush(stdout); 1297 _exit(rcode); 1298 } 1299 } 1300 1301 /* Check if the command matches any busybox internal commands 1302 * ("applets") here. 1303 * FIXME: This feature is not 100% safe, since 1304 * BusyBox is not fully reentrant, so we have no guarantee the things 1305 * from the .bss are still zeroed, or that things from .data are still 1306 * at their defaults. We could exec ourself from /proc/self/exe, but I 1307 * really dislike relying on /proc for things. We could exec ourself 1308 * from global_argv[0], but if we are in a chroot, we may not be able 1309 * to find ourself... */ 1310 #ifdef CONFIG_FEATURE_SH_STANDALONE_SHELL 1311 { 1312 int argc_l; 1313 char** argv_l=child->argv; 1314 char *name = child->argv[0]; 1315 1316 #ifdef CONFIG_FEATURE_SH_APPLETS_ALWAYS_WIN 1317 /* Following discussions from November 2000 on the busybox mailing 1318 * list, the default configuration, (without 1319 * get_last_path_component()) lets the user force use of an 1320 * external command by specifying the full (with slashes) filename. 1321 * If you enable CONFIG_FEATURE_SH_APPLETS_ALWAYS_WIN then applets 1322 * _aways_ override external commands, so if you want to run 1323 * /bin/cat, it will use BusyBox cat even if /bin/cat exists on the 1324 * filesystem and is _not_ busybox. Some systems may want this, 1325 * most do not. */ 1326 name = get_last_path_component(name); 1327 #endif 1328 /* Count argc for use in a second... */ 1329 for(argc_l=0;*argv_l!=NULL; argv_l++, argc_l++); 1330 optind = 1; 1331 debug_printf("running applet %s\n", name); 1332 run_applet_by_name(name, argc_l, child->argv); 1333 } 1334 #endif 1335 debug_printf("exec of %s\n",child->argv[0]); 1336 execvp(child->argv[0],child->argv); 1337 perror_msg("couldn't exec: %s",child->argv[0]); 1338 _exit(1); 1339 } else if (child->group) { 1340 debug_printf("runtime nesting to group\n"); 1341 interactive=0; /* crucial!!!! */ 1342 rcode = run_list_real(child->group); 1343 /* OK to leak memory by not calling free_pipe_list, 1344 * since this process is about to exit */ 1345 _exit(rcode); 1346 } else { 1347 /* Can happen. See what bash does with ">foo" by itself. */ 1348 debug_printf("trying to pseudo_exec null command\n"); 1349 _exit(EXIT_SUCCESS); 1350 } 1351 } 1352 1353 static void insert_bg_job(struct pipe *pi) 1354 { 1355 struct pipe *thejob; 1356 1357 /* Linear search for the ID of the job to use */ 1358 pi->jobid = 1; 1359 for (thejob = job_list; thejob; thejob = thejob->next) 1360 if (thejob->jobid >= pi->jobid) 1361 pi->jobid = thejob->jobid + 1; 1362 1363 /* add thejob to the list of running jobs */ 1364 if (!job_list) { 1365 thejob = job_list = xmalloc(sizeof(*thejob)); 1366 } else { 1367 for (thejob = job_list; thejob->next; thejob = thejob->next) /* nothing */; 1368 thejob->next = xmalloc(sizeof(*thejob)); 1369 thejob = thejob->next; 1370 } 1371 1372 /* physically copy the struct job */ 1373 memcpy(thejob, pi, sizeof(struct pipe)); 1374 thejob->next = NULL; 1375 thejob->running_progs = thejob->num_progs; 1376 thejob->stopped_progs = 0; 1377 thejob->text = xmalloc(BUFSIZ); /* cmdedit buffer size */ 1378 1379 /*if (pi->progs[0] && pi->progs[0].argv && pi->progs[0].argv[0]) */ 1380 { 1381 char *bar=thejob->text; 1382 char **foo=pi->progs[0].argv; 1383 while(foo && *foo) { 1384 bar += sprintf(bar, "%s ", *foo++); 1385 } 1386 } 1387 1388 /* we don't wait for background thejobs to return -- append it 1389 to the list of backgrounded thejobs and leave it alone */ 1390 printf("[%d] %d\n", thejob->jobid, thejob->progs[0].pid); 1391 last_bg_pid = thejob->progs[0].pid; 1392 last_jobid = thejob->jobid; 1393 } 1394 1395 /* remove a backgrounded job */ 1396 static void remove_bg_job(struct pipe *pi) 1397 { 1398 struct pipe *prev_pipe; 1399 1400 if (pi == job_list) { 1401 job_list = pi->next; 1402 } else { 1403 prev_pipe = job_list; 1404 while (prev_pipe->next != pi) 1405 prev_pipe = prev_pipe->next; 1406 prev_pipe->next = pi->next; 1407 } 1408 if (job_list) 1409 last_jobid = job_list->jobid; 1410 else 1411 last_jobid = 0; 1412 1413 pi->stopped_progs = 0; 1414 free_pipe(pi, 0); 1415 free(pi); 1416 } 1417 1418 /* Checks to see if any processes have exited -- if they 1419 have, figure out why and see if a job has completed */ 1420 static int checkjobs(struct pipe* fg_pipe) 1421 { 1422 int attributes; 1423 int status; 1424 int prognum = 0; 1425 struct pipe *pi; 1426 pid_t childpid; 1427 1428 attributes = WUNTRACED; 1429 if (fg_pipe==NULL) { 1430 attributes |= WNOHANG; 1431 } 1432 1433 while ((childpid = waitpid(-1, &status, attributes)) > 0) { 1434 if (fg_pipe) { 1435 int i, rcode = 0; 1436 for (i=0; i < fg_pipe->num_progs; i++) { 1437 if (fg_pipe->progs[i].pid == childpid) { 1438 if (i==fg_pipe->num_progs-1) 1439 rcode=WEXITSTATUS(status); 1440 (fg_pipe->num_progs)--; 1441 return(rcode); 1442 } 1443 } 1444 } 1445 1446 for (pi = job_list; pi; pi = pi->next) { 1447 prognum = 0; 1448 while (prognum < pi->num_progs && pi->progs[prognum].pid != childpid) { 1449 prognum++; 1450 } 1451 if (prognum < pi->num_progs) 1452 break; 1453 } 1454 1455 if(pi==NULL) { 1456 debug_printf("checkjobs: pid %d was not in our list!\n", childpid); 1457 continue; 1458 } 1459 1460 if (WIFEXITED(status) || WIFSIGNALED(status)) { 1461 /* child exited */ 1462 pi->running_progs--; 1463 pi->progs[prognum].pid = 0; 1464 1465 if (!pi->running_progs) { 1466 printf(JOB_STATUS_FORMAT, pi->jobid, "Done", pi->text); 1467 remove_bg_job(pi); 1468 } 1469 } else { 1470 /* child stopped */ 1471 pi->stopped_progs++; 1472 pi->progs[prognum].is_stopped = 1; 1473 1474 #if 0 1475 /* Printing this stuff is a pain, since it tends to 1476 * overwrite the prompt an inconveinient moments. So 1477 * don't do that. */ 1478 if (pi->stopped_progs == pi->num_progs) { 1479 printf("\n"JOB_STATUS_FORMAT, pi->jobid, "Stopped", pi->text); 1480 } 1481 #endif 1482 } 1483 } 1484 1485 if (childpid == -1 && errno != ECHILD) 1486 perror_msg("waitpid"); 1487 1488 /* move the shell to the foreground */ 1489 /*if (interactive && tcsetpgrp(shell_terminal, getpgid(0))) */ 1490 /* perror_msg("tcsetpgrp-2"); */ 1491 return -1; 1492 } 1493 1494 /* Figure out our controlling tty, checking in order stderr, 1495 * stdin, and stdout. If check_pgrp is set, also check that 1496 * we belong to the foreground process group associated with 1497 * that tty. The value of shell_terminal is needed in order to call 1498 * tcsetpgrp(shell_terminal, ...); */ 1499 void controlling_tty(int check_pgrp) 1500 { 1501 pid_t curpgrp; 1502 1503 if ((curpgrp = tcgetpgrp(shell_terminal = 2)) < 0 1504 && (curpgrp = tcgetpgrp(shell_terminal = 0)) < 0 1505 && (curpgrp = tcgetpgrp(shell_terminal = 1)) < 0) 1506 goto shell_terminal_error; 1507 1508 if (check_pgrp && curpgrp != getpgid(0)) 1509 goto shell_terminal_error; 1510 1511 return; 1512 1513 shell_terminal_error: 1514 shell_terminal = -1; 1515 return; 1516 } 1517 #endif 1518 1519 /* run_pipe_real() starts all the jobs, but doesn't wait for anything 1520 * to finish. See checkjobs(). 1521 * 1522 * return code is normally -1, when the caller has to wait for children 1523 * to finish to determine the exit status of the pipe. If the pipe 1524 * is a simple builtin command, however, the action is done by the 1525 * time run_pipe_real returns, and the exit code is provided as the 1526 * return value. 1527 * 1528 * The input of the pipe is always stdin, the output is always 1529 * stdout. The outpipe[] mechanism in BusyBox-0.48 lash is bogus, 1530 * because it tries to avoid running the command substitution in 1531 * subshell, when that is in fact necessary. The subshell process 1532 * now has its stdout directed to the input of the appropriate pipe, 1533 * so this routine is noticeably simpler. 1534 */ 1535 static int run_pipe_real(struct pipe *pi) 1536 { 1537 int i; 1538 #ifndef __U_BOOT__ 1539 int nextin, nextout; 1540 int pipefds[2]; /* pipefds[0] is for reading */ 1541 struct child_prog *child; 1542 struct built_in_command *x; 1543 char *p; 1544 # if __GNUC__ 1545 /* Avoid longjmp clobbering */ 1546 (void) &i; 1547 (void) &nextin; 1548 (void) &nextout; 1549 (void) &child; 1550 # endif 1551 #else 1552 int nextin; 1553 int flag = do_repeat ? CMD_FLAG_REPEAT : 0; 1554 struct child_prog *child; 1555 char *p; 1556 # if __GNUC__ 1557 /* Avoid longjmp clobbering */ 1558 (void) &i; 1559 (void) &nextin; 1560 (void) &child; 1561 # endif 1562 #endif /* __U_BOOT__ */ 1563 1564 nextin = 0; 1565 #ifndef __U_BOOT__ 1566 pi->pgrp = -1; 1567 #endif 1568 1569 /* Check if this is a simple builtin (not part of a pipe). 1570 * Builtins within pipes have to fork anyway, and are handled in 1571 * pseudo_exec. "echo foo | read bar" doesn't work on bash, either. 1572 */ 1573 if (pi->num_progs == 1) child = & (pi->progs[0]); 1574 #ifndef __U_BOOT__ 1575 if (pi->num_progs == 1 && child->group && child->subshell == 0) { 1576 int squirrel[] = {-1, -1, -1}; 1577 int rcode; 1578 debug_printf("non-subshell grouping\n"); 1579 setup_redirects(child, squirrel); 1580 /* XXX could we merge code with following builtin case, 1581 * by creating a pseudo builtin that calls run_list_real? */ 1582 rcode = run_list_real(child->group); 1583 restore_redirects(squirrel); 1584 #else 1585 if (pi->num_progs == 1 && child->group) { 1586 int rcode; 1587 debug_printf("non-subshell grouping\n"); 1588 rcode = run_list_real(child->group); 1589 #endif 1590 return rcode; 1591 } else if (pi->num_progs == 1 && pi->progs[0].argv != NULL) { 1592 for (i=0; is_assignment(child->argv[i]); i++) { /* nothing */ } 1593 if (i!=0 && child->argv[i]==NULL) { 1594 /* assignments, but no command: set the local environment */ 1595 for (i=0; child->argv[i]!=NULL; i++) { 1596 1597 /* Ok, this case is tricky. We have to decide if this is a 1598 * local variable, or an already exported variable. If it is 1599 * already exported, we have to export the new value. If it is 1600 * not exported, we need only set this as a local variable. 1601 * This junk is all to decide whether or not to export this 1602 * variable. */ 1603 int export_me=0; 1604 char *name, *value; 1605 name = xstrdup(child->argv[i]); 1606 debug_printf("Local environment set: %s\n", name); 1607 value = strchr(name, '='); 1608 if (value) 1609 *value=0; 1610 #ifndef __U_BOOT__ 1611 if ( get_local_var(name)) { 1612 export_me=1; 1613 } 1614 #endif 1615 free(name); 1616 p = insert_var_value(child->argv[i]); 1617 set_local_var(p, export_me); 1618 if (p != child->argv[i]) free(p); 1619 } 1620 return EXIT_SUCCESS; /* don't worry about errors in set_local_var() yet */ 1621 } 1622 for (i = 0; is_assignment(child->argv[i]); i++) { 1623 p = insert_var_value(child->argv[i]); 1624 #ifndef __U_BOOT__ 1625 putenv(strdup(p)); 1626 #else 1627 set_local_var(p, 0); 1628 #endif 1629 if (p != child->argv[i]) { 1630 child->sp--; 1631 free(p); 1632 } 1633 } 1634 if (child->sp) { 1635 char * str = NULL; 1636 1637 str = make_string(child->argv + i, 1638 child->argv_nonnull + i); 1639 parse_string_outer(str, FLAG_EXIT_FROM_LOOP | FLAG_REPARSING); 1640 free(str); 1641 return last_return_code; 1642 } 1643 #ifndef __U_BOOT__ 1644 for (x = bltins; x->cmd; x++) { 1645 if (strcmp(child->argv[i], x->cmd) == 0 ) { 1646 int squirrel[] = {-1, -1, -1}; 1647 int rcode; 1648 if (x->function == builtin_exec && child->argv[i+1]==NULL) { 1649 debug_printf("magic exec\n"); 1650 setup_redirects(child,NULL); 1651 return EXIT_SUCCESS; 1652 } 1653 debug_printf("builtin inline %s\n", child->argv[0]); 1654 /* XXX setup_redirects acts on file descriptors, not FILEs. 1655 * This is perfect for work that comes after exec(). 1656 * Is it really safe for inline use? Experimentally, 1657 * things seem to work with glibc. */ 1658 setup_redirects(child, squirrel); 1659 1660 child->argv += i; /* XXX horrible hack */ 1661 rcode = x->function(child); 1662 /* XXX restore hack so free() can work right */ 1663 child->argv -= i; 1664 restore_redirects(squirrel); 1665 } 1666 return rcode; 1667 } 1668 #else 1669 /* check ";", because ,example , argv consist from 1670 * "help;flinfo" must not execute 1671 */ 1672 if (strchr(child->argv[i], ';')) { 1673 printf("Unknown command '%s' - try 'help' or use " 1674 "'run' command\n", child->argv[i]); 1675 return -1; 1676 } 1677 /* Process the command */ 1678 return cmd_process(flag, child->argc, child->argv, 1679 &flag_repeat, NULL); 1680 #endif 1681 } 1682 #ifndef __U_BOOT__ 1683 1684 for (i = 0; i < pi->num_progs; i++) { 1685 child = & (pi->progs[i]); 1686 1687 /* pipes are inserted between pairs of commands */ 1688 if ((i + 1) < pi->num_progs) { 1689 if (pipe(pipefds)<0) perror_msg_and_die("pipe"); 1690 nextout = pipefds[1]; 1691 } else { 1692 nextout=1; 1693 pipefds[0] = -1; 1694 } 1695 1696 /* XXX test for failed fork()? */ 1697 if (!(child->pid = fork())) { 1698 /* Set the handling for job control signals back to the default. */ 1699 signal(SIGINT, SIG_DFL); 1700 signal(SIGQUIT, SIG_DFL); 1701 signal(SIGTERM, SIG_DFL); 1702 signal(SIGTSTP, SIG_DFL); 1703 signal(SIGTTIN, SIG_DFL); 1704 signal(SIGTTOU, SIG_DFL); 1705 signal(SIGCHLD, SIG_DFL); 1706 1707 close_all(); 1708 1709 if (nextin != 0) { 1710 dup2(nextin, 0); 1711 close(nextin); 1712 } 1713 if (nextout != 1) { 1714 dup2(nextout, 1); 1715 close(nextout); 1716 } 1717 if (pipefds[0]!=-1) { 1718 close(pipefds[0]); /* opposite end of our output pipe */ 1719 } 1720 1721 /* Like bash, explicit redirects override pipes, 1722 * and the pipe fd is available for dup'ing. */ 1723 setup_redirects(child,NULL); 1724 1725 if (interactive && pi->followup!=PIPE_BG) { 1726 /* If we (the child) win the race, put ourselves in the process 1727 * group whose leader is the first process in this pipe. */ 1728 if (pi->pgrp < 0) { 1729 pi->pgrp = getpid(); 1730 } 1731 if (setpgid(0, pi->pgrp) == 0) { 1732 tcsetpgrp(2, pi->pgrp); 1733 } 1734 } 1735 1736 pseudo_exec(child); 1737 } 1738 1739 1740 /* put our child in the process group whose leader is the 1741 first process in this pipe */ 1742 if (pi->pgrp < 0) { 1743 pi->pgrp = child->pid; 1744 } 1745 /* Don't check for errors. The child may be dead already, 1746 * in which case setpgid returns error code EACCES. */ 1747 setpgid(child->pid, pi->pgrp); 1748 1749 if (nextin != 0) 1750 close(nextin); 1751 if (nextout != 1) 1752 close(nextout); 1753 1754 /* If there isn't another process, nextin is garbage 1755 but it doesn't matter */ 1756 nextin = pipefds[0]; 1757 } 1758 #endif 1759 return -1; 1760 } 1761 1762 static int run_list_real(struct pipe *pi) 1763 { 1764 char *save_name = NULL; 1765 char **list = NULL; 1766 char **save_list = NULL; 1767 struct pipe *rpipe; 1768 int flag_rep = 0; 1769 #ifndef __U_BOOT__ 1770 int save_num_progs; 1771 #endif 1772 int rcode=0, flag_skip=1; 1773 int flag_restore = 0; 1774 int if_code=0, next_if_code=0; /* need double-buffer to handle elif */ 1775 reserved_style rmode, skip_more_in_this_rmode=RES_XXXX; 1776 /* check syntax for "for" */ 1777 for (rpipe = pi; rpipe; rpipe = rpipe->next) { 1778 if ((rpipe->r_mode == RES_IN || 1779 rpipe->r_mode == RES_FOR) && 1780 (rpipe->next == NULL)) { 1781 syntax(); 1782 #ifdef __U_BOOT__ 1783 flag_repeat = 0; 1784 #endif 1785 return 1; 1786 } 1787 if ((rpipe->r_mode == RES_IN && 1788 (rpipe->next->r_mode == RES_IN && 1789 rpipe->next->progs->argv != NULL))|| 1790 (rpipe->r_mode == RES_FOR && 1791 rpipe->next->r_mode != RES_IN)) { 1792 syntax(); 1793 #ifdef __U_BOOT__ 1794 flag_repeat = 0; 1795 #endif 1796 return 1; 1797 } 1798 } 1799 for (; pi; pi = (flag_restore != 0) ? rpipe : pi->next) { 1800 if (pi->r_mode == RES_WHILE || pi->r_mode == RES_UNTIL || 1801 pi->r_mode == RES_FOR) { 1802 #ifdef __U_BOOT__ 1803 /* check Ctrl-C */ 1804 ctrlc(); 1805 if ((had_ctrlc())) { 1806 return 1; 1807 } 1808 #endif 1809 flag_restore = 0; 1810 if (!rpipe) { 1811 flag_rep = 0; 1812 rpipe = pi; 1813 } 1814 } 1815 rmode = pi->r_mode; 1816 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); 1817 if (rmode == skip_more_in_this_rmode && flag_skip) { 1818 if (pi->followup == PIPE_SEQ) flag_skip=0; 1819 continue; 1820 } 1821 flag_skip = 1; 1822 skip_more_in_this_rmode = RES_XXXX; 1823 if (rmode == RES_THEN || rmode == RES_ELSE) if_code = next_if_code; 1824 if (rmode == RES_THEN && if_code) continue; 1825 if (rmode == RES_ELSE && !if_code) continue; 1826 if (rmode == RES_ELIF && !if_code) break; 1827 if (rmode == RES_FOR && pi->num_progs) { 1828 if (!list) { 1829 /* if no variable values after "in" we skip "for" */ 1830 if (!pi->next->progs->argv) continue; 1831 /* create list of variable values */ 1832 list = make_list_in(pi->next->progs->argv, 1833 pi->progs->argv[0]); 1834 save_list = list; 1835 save_name = pi->progs->argv[0]; 1836 pi->progs->argv[0] = NULL; 1837 flag_rep = 1; 1838 } 1839 if (!(*list)) { 1840 free(pi->progs->argv[0]); 1841 free(save_list); 1842 list = NULL; 1843 flag_rep = 0; 1844 pi->progs->argv[0] = save_name; 1845 #ifndef __U_BOOT__ 1846 pi->progs->glob_result.gl_pathv[0] = 1847 pi->progs->argv[0]; 1848 #endif 1849 continue; 1850 } else { 1851 /* insert new value from list for variable */ 1852 if (pi->progs->argv[0]) 1853 free(pi->progs->argv[0]); 1854 pi->progs->argv[0] = *list++; 1855 #ifndef __U_BOOT__ 1856 pi->progs->glob_result.gl_pathv[0] = 1857 pi->progs->argv[0]; 1858 #endif 1859 } 1860 } 1861 if (rmode == RES_IN) continue; 1862 if (rmode == RES_DO) { 1863 if (!flag_rep) continue; 1864 } 1865 if (rmode == RES_DONE) { 1866 if (flag_rep) { 1867 flag_restore = 1; 1868 } else { 1869 rpipe = NULL; 1870 } 1871 } 1872 if (pi->num_progs == 0) continue; 1873 #ifndef __U_BOOT__ 1874 save_num_progs = pi->num_progs; /* save number of programs */ 1875 #endif 1876 rcode = run_pipe_real(pi); 1877 debug_printf("run_pipe_real returned %d\n",rcode); 1878 #ifndef __U_BOOT__ 1879 if (rcode!=-1) { 1880 /* We only ran a builtin: rcode was set by the return value 1881 * of run_pipe_real(), and we don't need to wait for anything. */ 1882 } else if (pi->followup==PIPE_BG) { 1883 /* XXX check bash's behavior with nontrivial pipes */ 1884 /* XXX compute jobid */ 1885 /* XXX what does bash do with attempts to background builtins? */ 1886 insert_bg_job(pi); 1887 rcode = EXIT_SUCCESS; 1888 } else { 1889 if (interactive) { 1890 /* move the new process group into the foreground */ 1891 if (tcsetpgrp(shell_terminal, pi->pgrp) && errno != ENOTTY) 1892 perror_msg("tcsetpgrp-3"); 1893 rcode = checkjobs(pi); 1894 /* move the shell to the foreground */ 1895 if (tcsetpgrp(shell_terminal, getpgid(0)) && errno != ENOTTY) 1896 perror_msg("tcsetpgrp-4"); 1897 } else { 1898 rcode = checkjobs(pi); 1899 } 1900 debug_printf("checkjobs returned %d\n",rcode); 1901 } 1902 last_return_code=rcode; 1903 #else 1904 if (rcode < -1) { 1905 last_return_code = -rcode - 2; 1906 return -2; /* exit */ 1907 } 1908 last_return_code=(rcode == 0) ? 0 : 1; 1909 #endif 1910 #ifndef __U_BOOT__ 1911 pi->num_progs = save_num_progs; /* restore number of programs */ 1912 #endif 1913 if ( rmode == RES_IF || rmode == RES_ELIF ) 1914 next_if_code=rcode; /* can be overwritten a number of times */ 1915 if (rmode == RES_WHILE) 1916 flag_rep = !last_return_code; 1917 if (rmode == RES_UNTIL) 1918 flag_rep = last_return_code; 1919 if ( (rcode==EXIT_SUCCESS && pi->followup==PIPE_OR) || 1920 (rcode!=EXIT_SUCCESS && pi->followup==PIPE_AND) ) 1921 skip_more_in_this_rmode=rmode; 1922 #ifndef __U_BOOT__ 1923 checkjobs(NULL); 1924 #endif 1925 } 1926 return rcode; 1927 } 1928 1929 /* broken, of course, but OK for testing */ 1930 static char *indenter(int i) 1931 { 1932 static char blanks[]=" "; 1933 return &blanks[sizeof(blanks)-i-1]; 1934 } 1935 1936 /* return code is the exit status of the pipe */ 1937 static int free_pipe(struct pipe *pi, int indent) 1938 { 1939 char **p; 1940 struct child_prog *child; 1941 #ifndef __U_BOOT__ 1942 struct redir_struct *r, *rnext; 1943 #endif 1944 int a, i, ret_code=0; 1945 char *ind = indenter(indent); 1946 1947 #ifndef __U_BOOT__ 1948 if (pi->stopped_progs > 0) 1949 return ret_code; 1950 final_printf("%s run pipe: (pid %d)\n",ind,getpid()); 1951 #endif 1952 for (i=0; i<pi->num_progs; i++) { 1953 child = &pi->progs[i]; 1954 final_printf("%s command %d:\n",ind,i); 1955 if (child->argv) { 1956 for (a=0,p=child->argv; *p; a++,p++) { 1957 final_printf("%s argv[%d] = %s\n",ind,a,*p); 1958 } 1959 #ifndef __U_BOOT__ 1960 globfree(&child->glob_result); 1961 #else 1962 for (a = 0; a < child->argc; a++) { 1963 free(child->argv[a]); 1964 } 1965 free(child->argv); 1966 free(child->argv_nonnull); 1967 child->argc = 0; 1968 #endif 1969 child->argv=NULL; 1970 } else if (child->group) { 1971 #ifndef __U_BOOT__ 1972 final_printf("%s begin group (subshell:%d)\n",ind, child->subshell); 1973 #endif 1974 ret_code = free_pipe_list(child->group,indent+3); 1975 final_printf("%s end group\n",ind); 1976 } else { 1977 final_printf("%s (nil)\n",ind); 1978 } 1979 #ifndef __U_BOOT__ 1980 for (r=child->redirects; r; r=rnext) { 1981 final_printf("%s redirect %d%s", ind, r->fd, redir_table[r->type].descrip); 1982 if (r->dup == -1) { 1983 /* guard against the case >$FOO, where foo is unset or blank */ 1984 if (r->word.gl_pathv) { 1985 final_printf(" %s\n", *r->word.gl_pathv); 1986 globfree(&r->word); 1987 } 1988 } else { 1989 final_printf("&%d\n", r->dup); 1990 } 1991 rnext=r->next; 1992 free(r); 1993 } 1994 child->redirects=NULL; 1995 #endif 1996 } 1997 free(pi->progs); /* children are an array, they get freed all at once */ 1998 pi->progs=NULL; 1999 return ret_code; 2000 } 2001 2002 static int free_pipe_list(struct pipe *head, int indent) 2003 { 2004 int rcode=0; /* if list has no members */ 2005 struct pipe *pi, *next; 2006 char *ind = indenter(indent); 2007 for (pi=head; pi; pi=next) { 2008 final_printf("%s pipe reserved mode %d\n", ind, pi->r_mode); 2009 rcode = free_pipe(pi, indent); 2010 final_printf("%s pipe followup code %d\n", ind, pi->followup); 2011 next=pi->next; 2012 pi->next=NULL; 2013 free(pi); 2014 } 2015 return rcode; 2016 } 2017 2018 /* Select which version we will use */ 2019 static int run_list(struct pipe *pi) 2020 { 2021 int rcode=0; 2022 #ifndef __U_BOOT__ 2023 if (fake_mode==0) { 2024 #endif 2025 rcode = run_list_real(pi); 2026 #ifndef __U_BOOT__ 2027 } 2028 #endif 2029 /* free_pipe_list has the side effect of clearing memory 2030 * In the long run that function can be merged with run_list_real, 2031 * but doing that now would hobble the debugging effort. */ 2032 free_pipe_list(pi,0); 2033 return rcode; 2034 } 2035 2036 /* The API for glob is arguably broken. This routine pushes a non-matching 2037 * string into the output structure, removing non-backslashed backslashes. 2038 * If someone can prove me wrong, by performing this function within the 2039 * original glob(3) api, feel free to rewrite this routine into oblivion. 2040 * Return code (0 vs. GLOB_NOSPACE) matches glob(3). 2041 * XXX broken if the last character is '\\', check that before calling. 2042 */ 2043 #ifndef __U_BOOT__ 2044 static int globhack(const char *src, int flags, glob_t *pglob) 2045 { 2046 int cnt=0, pathc; 2047 const char *s; 2048 char *dest; 2049 for (cnt=1, s=src; s && *s; s++) { 2050 if (*s == '\\') s++; 2051 cnt++; 2052 } 2053 dest = malloc(cnt); 2054 if (!dest) return GLOB_NOSPACE; 2055 if (!(flags & GLOB_APPEND)) { 2056 pglob->gl_pathv=NULL; 2057 pglob->gl_pathc=0; 2058 pglob->gl_offs=0; 2059 pglob->gl_offs=0; 2060 } 2061 pathc = ++pglob->gl_pathc; 2062 pglob->gl_pathv = realloc(pglob->gl_pathv, (pathc+1)*sizeof(*pglob->gl_pathv)); 2063 if (pglob->gl_pathv == NULL) return GLOB_NOSPACE; 2064 pglob->gl_pathv[pathc-1]=dest; 2065 pglob->gl_pathv[pathc]=NULL; 2066 for (s=src; s && *s; s++, dest++) { 2067 if (*s == '\\') s++; 2068 *dest = *s; 2069 } 2070 *dest='\0'; 2071 return 0; 2072 } 2073 2074 /* XXX broken if the last character is '\\', check that before calling */ 2075 static int glob_needed(const char *s) 2076 { 2077 for (; *s; s++) { 2078 if (*s == '\\') s++; 2079 if (strchr("*[?",*s)) return 1; 2080 } 2081 return 0; 2082 } 2083 2084 #if 0 2085 static void globprint(glob_t *pglob) 2086 { 2087 int i; 2088 debug_printf("glob_t at %p:\n", pglob); 2089 debug_printf(" gl_pathc=%d gl_pathv=%p gl_offs=%d gl_flags=%d\n", 2090 pglob->gl_pathc, pglob->gl_pathv, pglob->gl_offs, pglob->gl_flags); 2091 for (i=0; i<pglob->gl_pathc; i++) 2092 debug_printf("pglob->gl_pathv[%d] = %p = %s\n", i, 2093 pglob->gl_pathv[i], pglob->gl_pathv[i]); 2094 } 2095 #endif 2096 2097 static int xglob(o_string *dest, int flags, glob_t *pglob) 2098 { 2099 int gr; 2100 2101 /* short-circuit for null word */ 2102 /* we can code this better when the debug_printf's are gone */ 2103 if (dest->length == 0) { 2104 if (dest->nonnull) { 2105 /* bash man page calls this an "explicit" null */ 2106 gr = globhack(dest->data, flags, pglob); 2107 debug_printf("globhack returned %d\n",gr); 2108 } else { 2109 return 0; 2110 } 2111 } else if (glob_needed(dest->data)) { 2112 gr = glob(dest->data, flags, NULL, pglob); 2113 debug_printf("glob returned %d\n",gr); 2114 if (gr == GLOB_NOMATCH) { 2115 /* quote removal, or more accurately, backslash removal */ 2116 gr = globhack(dest->data, flags, pglob); 2117 debug_printf("globhack returned %d\n",gr); 2118 } 2119 } else { 2120 gr = globhack(dest->data, flags, pglob); 2121 debug_printf("globhack returned %d\n",gr); 2122 } 2123 if (gr == GLOB_NOSPACE) 2124 error_msg_and_die("out of memory during glob"); 2125 if (gr != 0) { /* GLOB_ABORTED ? */ 2126 error_msg("glob(3) error %d",gr); 2127 } 2128 /* globprint(glob_target); */ 2129 return gr; 2130 } 2131 #endif 2132 2133 #ifdef __U_BOOT__ 2134 static char *get_dollar_var(char ch); 2135 #endif 2136 2137 /* This is used to get/check local shell variables */ 2138 char *get_local_var(const char *s) 2139 { 2140 struct variables *cur; 2141 2142 if (!s) 2143 return NULL; 2144 2145 #ifdef __U_BOOT__ 2146 if (*s == '$') 2147 return get_dollar_var(s[1]); 2148 #endif 2149 2150 for (cur = top_vars; cur; cur=cur->next) 2151 if(strcmp(cur->name, s)==0) 2152 return cur->value; 2153 return NULL; 2154 } 2155 2156 /* This is used to set local shell variables 2157 flg_export==0 if only local (not exporting) variable 2158 flg_export==1 if "new" exporting environ 2159 flg_export>1 if current startup environ (not call putenv()) */ 2160 int set_local_var(const char *s, int flg_export) 2161 { 2162 char *name, *value; 2163 int result=0; 2164 struct variables *cur; 2165 2166 #ifdef __U_BOOT__ 2167 /* might be possible! */ 2168 if (!isalpha(*s)) 2169 return -1; 2170 #endif 2171 2172 name=strdup(s); 2173 2174 #ifdef __U_BOOT__ 2175 if (env_get(name) != NULL) { 2176 printf ("ERROR: " 2177 "There is a global environment variable with the same name.\n"); 2178 free(name); 2179 return -1; 2180 } 2181 #endif 2182 /* Assume when we enter this function that we are already in 2183 * NAME=VALUE format. So the first order of business is to 2184 * split 's' on the '=' into 'name' and 'value' */ 2185 value = strchr(name, '='); 2186 if (value == NULL || *(value + 1) == 0) { 2187 free(name); 2188 return -1; 2189 } 2190 *value++ = 0; 2191 2192 for(cur = top_vars; cur; cur = cur->next) { 2193 if(strcmp(cur->name, name)==0) 2194 break; 2195 } 2196 2197 if(cur) { 2198 if(strcmp(cur->value, value)==0) { 2199 if(flg_export>0 && cur->flg_export==0) 2200 cur->flg_export=flg_export; 2201 else 2202 result++; 2203 } else { 2204 if(cur->flg_read_only) { 2205 error_msg("%s: readonly variable", name); 2206 result = -1; 2207 } else { 2208 if(flg_export>0 || cur->flg_export>1) 2209 cur->flg_export=1; 2210 free(cur->value); 2211 2212 cur->value = strdup(value); 2213 } 2214 } 2215 } else { 2216 cur = malloc(sizeof(struct variables)); 2217 if(!cur) { 2218 result = -1; 2219 } else { 2220 cur->name = strdup(name); 2221 if (cur->name == NULL) { 2222 free(cur); 2223 result = -1; 2224 } else { 2225 struct variables *bottom = top_vars; 2226 cur->value = strdup(value); 2227 cur->next = NULL; 2228 cur->flg_export = flg_export; 2229 cur->flg_read_only = 0; 2230 while(bottom->next) bottom=bottom->next; 2231 bottom->next = cur; 2232 } 2233 } 2234 } 2235 2236 #ifndef __U_BOOT__ 2237 if(result==0 && cur->flg_export==1) { 2238 *(value-1) = '='; 2239 result = putenv(name); 2240 } else { 2241 #endif 2242 free(name); 2243 #ifndef __U_BOOT__ 2244 if(result>0) /* equivalent to previous set */ 2245 result = 0; 2246 } 2247 #endif 2248 return result; 2249 } 2250 2251 void unset_local_var(const char *name) 2252 { 2253 struct variables *cur; 2254 2255 if (name) { 2256 for (cur = top_vars; cur; cur=cur->next) { 2257 if(strcmp(cur->name, name)==0) 2258 break; 2259 } 2260 if (cur != NULL) { 2261 struct variables *next = top_vars; 2262 if(cur->flg_read_only) { 2263 error_msg("%s: readonly variable", name); 2264 return; 2265 } else { 2266 #ifndef __U_BOOT__ 2267 if(cur->flg_export) 2268 unenv_set(cur->name); 2269 #endif 2270 free(cur->name); 2271 free(cur->value); 2272 while (next->next != cur) 2273 next = next->next; 2274 next->next = cur->next; 2275 } 2276 free(cur); 2277 } 2278 } 2279 } 2280 2281 static int is_assignment(const char *s) 2282 { 2283 if (s == NULL) 2284 return 0; 2285 2286 if (!isalpha(*s)) return 0; 2287 ++s; 2288 while(isalnum(*s) || *s=='_') ++s; 2289 return *s=='='; 2290 } 2291 2292 #ifndef __U_BOOT__ 2293 /* the src parameter allows us to peek forward to a possible &n syntax 2294 * for file descriptor duplication, e.g., "2>&1". 2295 * Return code is 0 normally, 1 if a syntax error is detected in src. 2296 * Resource errors (in xmalloc) cause the process to exit */ 2297 static int setup_redirect(struct p_context *ctx, int fd, redir_type style, 2298 struct in_str *input) 2299 { 2300 struct child_prog *child=ctx->child; 2301 struct redir_struct *redir = child->redirects; 2302 struct redir_struct *last_redir=NULL; 2303 2304 /* Create a new redir_struct and drop it onto the end of the linked list */ 2305 while(redir) { 2306 last_redir=redir; 2307 redir=redir->next; 2308 } 2309 redir = xmalloc(sizeof(struct redir_struct)); 2310 redir->next=NULL; 2311 redir->word.gl_pathv=NULL; 2312 if (last_redir) { 2313 last_redir->next=redir; 2314 } else { 2315 child->redirects=redir; 2316 } 2317 2318 redir->type=style; 2319 redir->fd= (fd==-1) ? redir_table[style].default_fd : fd ; 2320 2321 debug_printf("Redirect type %d%s\n", redir->fd, redir_table[style].descrip); 2322 2323 /* Check for a '2>&1' type redirect */ 2324 redir->dup = redirect_dup_num(input); 2325 if (redir->dup == -2) return 1; /* syntax error */ 2326 if (redir->dup != -1) { 2327 /* Erik had a check here that the file descriptor in question 2328 * is legit; I postpone that to "run time" 2329 * A "-" representation of "close me" shows up as a -3 here */ 2330 debug_printf("Duplicating redirect '%d>&%d'\n", redir->fd, redir->dup); 2331 } else { 2332 /* We do _not_ try to open the file that src points to, 2333 * since we need to return and let src be expanded first. 2334 * Set ctx->pending_redirect, so we know what to do at the 2335 * end of the next parsed word. 2336 */ 2337 ctx->pending_redirect = redir; 2338 } 2339 return 0; 2340 } 2341 #endif 2342 2343 static struct pipe *new_pipe(void) 2344 { 2345 struct pipe *pi; 2346 pi = xmalloc(sizeof(struct pipe)); 2347 pi->num_progs = 0; 2348 pi->progs = NULL; 2349 pi->next = NULL; 2350 pi->followup = 0; /* invalid */ 2351 pi->r_mode = RES_NONE; 2352 return pi; 2353 } 2354 2355 static void initialize_context(struct p_context *ctx) 2356 { 2357 ctx->pipe=NULL; 2358 #ifndef __U_BOOT__ 2359 ctx->pending_redirect=NULL; 2360 #endif 2361 ctx->child=NULL; 2362 ctx->list_head=new_pipe(); 2363 ctx->pipe=ctx->list_head; 2364 ctx->w=RES_NONE; 2365 ctx->stack=NULL; 2366 #ifdef __U_BOOT__ 2367 ctx->old_flag=0; 2368 #endif 2369 done_command(ctx); /* creates the memory for working child */ 2370 } 2371 2372 /* normal return is 0 2373 * if a reserved word is found, and processed, return 1 2374 * should handle if, then, elif, else, fi, for, while, until, do, done. 2375 * case, function, and select are obnoxious, save those for later. 2376 */ 2377 struct reserved_combo { 2378 char *literal; 2379 int code; 2380 long flag; 2381 }; 2382 /* Mostly a list of accepted follow-up reserved words. 2383 * FLAG_END means we are done with the sequence, and are ready 2384 * to turn the compound list into a command. 2385 * FLAG_START means the word must start a new compound list. 2386 */ 2387 static struct reserved_combo reserved_list[] = { 2388 { "if", RES_IF, FLAG_THEN | FLAG_START }, 2389 { "then", RES_THEN, FLAG_ELIF | FLAG_ELSE | FLAG_FI }, 2390 { "elif", RES_ELIF, FLAG_THEN }, 2391 { "else", RES_ELSE, FLAG_FI }, 2392 { "fi", RES_FI, FLAG_END }, 2393 { "for", RES_FOR, FLAG_IN | FLAG_START }, 2394 { "while", RES_WHILE, FLAG_DO | FLAG_START }, 2395 { "until", RES_UNTIL, FLAG_DO | FLAG_START }, 2396 { "in", RES_IN, FLAG_DO }, 2397 { "do", RES_DO, FLAG_DONE }, 2398 { "done", RES_DONE, FLAG_END } 2399 }; 2400 #define NRES (sizeof(reserved_list)/sizeof(struct reserved_combo)) 2401 2402 static int reserved_word(o_string *dest, struct p_context *ctx) 2403 { 2404 struct reserved_combo *r; 2405 for (r=reserved_list; 2406 r<reserved_list+NRES; r++) { 2407 if (strcmp(dest->data, r->literal) == 0) { 2408 debug_printf("found reserved word %s, code %d\n",r->literal,r->code); 2409 if (r->flag & FLAG_START) { 2410 struct p_context *new = xmalloc(sizeof(struct p_context)); 2411 debug_printf("push stack\n"); 2412 if (ctx->w == RES_IN || ctx->w == RES_FOR) { 2413 syntax(); 2414 free(new); 2415 ctx->w = RES_SNTX; 2416 b_reset(dest); 2417 return 1; 2418 } 2419 *new = *ctx; /* physical copy */ 2420 initialize_context(ctx); 2421 ctx->stack=new; 2422 } else if ( ctx->w == RES_NONE || ! (ctx->old_flag & (1<<r->code))) { 2423 syntax(); 2424 ctx->w = RES_SNTX; 2425 b_reset(dest); 2426 return 1; 2427 } 2428 ctx->w=r->code; 2429 ctx->old_flag = r->flag; 2430 if (ctx->old_flag & FLAG_END) { 2431 struct p_context *old; 2432 debug_printf("pop stack\n"); 2433 done_pipe(ctx,PIPE_SEQ); 2434 old = ctx->stack; 2435 old->child->group = ctx->list_head; 2436 #ifndef __U_BOOT__ 2437 old->child->subshell = 0; 2438 #endif 2439 *ctx = *old; /* physical copy */ 2440 free(old); 2441 } 2442 b_reset (dest); 2443 return 1; 2444 } 2445 } 2446 return 0; 2447 } 2448 2449 /* normal return is 0. 2450 * Syntax or xglob errors return 1. */ 2451 static int done_word(o_string *dest, struct p_context *ctx) 2452 { 2453 struct child_prog *child=ctx->child; 2454 #ifndef __U_BOOT__ 2455 glob_t *glob_target; 2456 int gr, flags = 0; 2457 #else 2458 char *str, *s; 2459 int argc, cnt; 2460 #endif 2461 2462 debug_printf("done_word: %s %p\n", dest->data, child); 2463 if (dest->length == 0 && !dest->nonnull) { 2464 debug_printf(" true null, ignored\n"); 2465 return 0; 2466 } 2467 #ifndef __U_BOOT__ 2468 if (ctx->pending_redirect) { 2469 glob_target = &ctx->pending_redirect->word; 2470 } else { 2471 #endif 2472 if (child->group) { 2473 syntax(); 2474 return 1; /* syntax error, groups and arglists don't mix */ 2475 } 2476 if (!child->argv && (ctx->type & FLAG_PARSE_SEMICOLON)) { 2477 debug_printf("checking %s for reserved-ness\n",dest->data); 2478 if (reserved_word(dest,ctx)) return ctx->w==RES_SNTX; 2479 } 2480 #ifndef __U_BOOT__ 2481 glob_target = &child->glob_result; 2482 if (child->argv) flags |= GLOB_APPEND; 2483 #else 2484 for (cnt = 1, s = dest->data; s && *s; s++) { 2485 if (*s == '\\') s++; 2486 cnt++; 2487 } 2488 str = malloc(cnt); 2489 if (!str) return 1; 2490 if ( child->argv == NULL) { 2491 child->argc=0; 2492 } 2493 argc = ++child->argc; 2494 child->argv = realloc(child->argv, (argc+1)*sizeof(*child->argv)); 2495 if (child->argv == NULL) { 2496 free(str); 2497 return 1; 2498 } 2499 child->argv_nonnull = realloc(child->argv_nonnull, 2500 (argc+1)*sizeof(*child->argv_nonnull)); 2501 if (child->argv_nonnull == NULL) { 2502 free(str); 2503 return 1; 2504 } 2505 child->argv[argc-1]=str; 2506 child->argv_nonnull[argc-1] = dest->nonnull; 2507 child->argv[argc]=NULL; 2508 child->argv_nonnull[argc] = 0; 2509 for (s = dest->data; s && *s; s++,str++) { 2510 if (*s == '\\') s++; 2511 *str = *s; 2512 } 2513 *str = '\0'; 2514 #endif 2515 #ifndef __U_BOOT__ 2516 } 2517 gr = xglob(dest, flags, glob_target); 2518 if (gr != 0) return 1; 2519 #endif 2520 2521 b_reset(dest); 2522 #ifndef __U_BOOT__ 2523 if (ctx->pending_redirect) { 2524 ctx->pending_redirect=NULL; 2525 if (glob_target->gl_pathc != 1) { 2526 error_msg("ambiguous redirect"); 2527 return 1; 2528 } 2529 } else { 2530 child->argv = glob_target->gl_pathv; 2531 } 2532 #endif 2533 if (ctx->w == RES_FOR) { 2534 done_word(dest,ctx); 2535 done_pipe(ctx,PIPE_SEQ); 2536 } 2537 return 0; 2538 } 2539 2540 /* The only possible error here is out of memory, in which case 2541 * xmalloc exits. */ 2542 static int done_command(struct p_context *ctx) 2543 { 2544 /* The child is really already in the pipe structure, so 2545 * advance the pipe counter and make a new, null child. 2546 * Only real trickiness here is that the uncommitted 2547 * child structure, to which ctx->child points, is not 2548 * counted in pi->num_progs. */ 2549 struct pipe *pi=ctx->pipe; 2550 struct child_prog *prog=ctx->child; 2551 2552 if (prog && prog->group == NULL 2553 && prog->argv == NULL 2554 #ifndef __U_BOOT__ 2555 && prog->redirects == NULL) { 2556 #else 2557 ) { 2558 #endif 2559 debug_printf("done_command: skipping null command\n"); 2560 return 0; 2561 } else if (prog) { 2562 pi->num_progs++; 2563 debug_printf("done_command: num_progs incremented to %d\n",pi->num_progs); 2564 } else { 2565 debug_printf("done_command: initializing\n"); 2566 } 2567 pi->progs = xrealloc(pi->progs, sizeof(*pi->progs) * (pi->num_progs+1)); 2568 2569 prog = pi->progs + pi->num_progs; 2570 #ifndef __U_BOOT__ 2571 prog->redirects = NULL; 2572 #endif 2573 prog->argv = NULL; 2574 prog->argv_nonnull = NULL; 2575 #ifndef __U_BOOT__ 2576 prog->is_stopped = 0; 2577 #endif 2578 prog->group = NULL; 2579 #ifndef __U_BOOT__ 2580 prog->glob_result.gl_pathv = NULL; 2581 prog->family = pi; 2582 #endif 2583 prog->sp = 0; 2584 ctx->child = prog; 2585 prog->type = ctx->type; 2586 2587 /* but ctx->pipe and ctx->list_head remain unchanged */ 2588 return 0; 2589 } 2590 2591 static int done_pipe(struct p_context *ctx, pipe_style type) 2592 { 2593 struct pipe *new_p; 2594 done_command(ctx); /* implicit closure of previous command */ 2595 debug_printf("done_pipe, type %d\n", type); 2596 ctx->pipe->followup = type; 2597 ctx->pipe->r_mode = ctx->w; 2598 new_p=new_pipe(); 2599 ctx->pipe->next = new_p; 2600 ctx->pipe = new_p; 2601 ctx->child = NULL; 2602 done_command(ctx); /* set up new pipe to accept commands */ 2603 return 0; 2604 } 2605 2606 #ifndef __U_BOOT__ 2607 /* peek ahead in the in_str to find out if we have a "&n" construct, 2608 * as in "2>&1", that represents duplicating a file descriptor. 2609 * returns either -2 (syntax error), -1 (no &), or the number found. 2610 */ 2611 static int redirect_dup_num(struct in_str *input) 2612 { 2613 int ch, d=0, ok=0; 2614 ch = b_peek(input); 2615 if (ch != '&') return -1; 2616 2617 b_getch(input); /* get the & */ 2618 ch=b_peek(input); 2619 if (ch == '-') { 2620 b_getch(input); 2621 return -3; /* "-" represents "close me" */ 2622 } 2623 while (isdigit(ch)) { 2624 d = d*10+(ch-'0'); 2625 ok=1; 2626 b_getch(input); 2627 ch = b_peek(input); 2628 } 2629 if (ok) return d; 2630 2631 error_msg("ambiguous redirect"); 2632 return -2; 2633 } 2634 2635 /* If a redirect is immediately preceded by a number, that number is 2636 * supposed to tell which file descriptor to redirect. This routine 2637 * looks for such preceding numbers. In an ideal world this routine 2638 * needs to handle all the following classes of redirects... 2639 * echo 2>foo # redirects fd 2 to file "foo", nothing passed to echo 2640 * echo 49>foo # redirects fd 49 to file "foo", nothing passed to echo 2641 * echo -2>foo # redirects fd 1 to file "foo", "-2" passed to echo 2642 * echo 49x>foo # redirects fd 1 to file "foo", "49x" passed to echo 2643 * A -1 output from this program means no valid number was found, so the 2644 * caller should use the appropriate default for this redirection. 2645 */ 2646 static int redirect_opt_num(o_string *o) 2647 { 2648 int num; 2649 2650 if (o->length==0) return -1; 2651 for(num=0; num<o->length; num++) { 2652 if (!isdigit(*(o->data+num))) { 2653 return -1; 2654 } 2655 } 2656 /* reuse num (and save an int) */ 2657 num=atoi(o->data); 2658 b_reset(o); 2659 return num; 2660 } 2661 2662 FILE *generate_stream_from_list(struct pipe *head) 2663 { 2664 FILE *pf; 2665 #if 1 2666 int pid, channel[2]; 2667 if (pipe(channel)<0) perror_msg_and_die("pipe"); 2668 pid=fork(); 2669 if (pid<0) { 2670 perror_msg_and_die("fork"); 2671 } else if (pid==0) { 2672 close(channel[0]); 2673 if (channel[1] != 1) { 2674 dup2(channel[1],1); 2675 close(channel[1]); 2676 } 2677 #if 0 2678 #define SURROGATE "surrogate response" 2679 write(1,SURROGATE,sizeof(SURROGATE)); 2680 _exit(run_list(head)); 2681 #else 2682 _exit(run_list_real(head)); /* leaks memory */ 2683 #endif 2684 } 2685 debug_printf("forked child %d\n",pid); 2686 close(channel[1]); 2687 pf = fdopen(channel[0],"r"); 2688 debug_printf("pipe on FILE *%p\n",pf); 2689 #else 2690 free_pipe_list(head,0); 2691 pf=popen("echo surrogate response","r"); 2692 debug_printf("started fake pipe on FILE *%p\n",pf); 2693 #endif 2694 return pf; 2695 } 2696 2697 /* this version hacked for testing purposes */ 2698 /* return code is exit status of the process that is run. */ 2699 static int process_command_subs(o_string *dest, struct p_context *ctx, struct in_str *input, int subst_end) 2700 { 2701 int retcode; 2702 o_string result=NULL_O_STRING; 2703 struct p_context inner; 2704 FILE *p; 2705 struct in_str pipe_str; 2706 initialize_context(&inner); 2707 2708 /* recursion to generate command */ 2709 retcode = parse_stream(&result, &inner, input, subst_end); 2710 if (retcode != 0) return retcode; /* syntax error or EOF */ 2711 done_word(&result, &inner); 2712 done_pipe(&inner, PIPE_SEQ); 2713 b_free(&result); 2714 2715 p=generate_stream_from_list(inner.list_head); 2716 if (p==NULL) return 1; 2717 mark_open(fileno(p)); 2718 setup_file_in_str(&pipe_str, p); 2719 2720 /* now send results of command back into original context */ 2721 retcode = parse_stream(dest, ctx, &pipe_str, '\0'); 2722 /* XXX In case of a syntax error, should we try to kill the child? 2723 * That would be tough to do right, so just read until EOF. */ 2724 if (retcode == 1) { 2725 while (b_getch(&pipe_str)!=EOF) { /* discard */ }; 2726 } 2727 2728 debug_printf("done reading from pipe, pclose()ing\n"); 2729 /* This is the step that wait()s for the child. Should be pretty 2730 * safe, since we just read an EOF from its stdout. We could try 2731 * to better, by using wait(), and keeping track of background jobs 2732 * at the same time. That would be a lot of work, and contrary 2733 * to the KISS philosophy of this program. */ 2734 mark_closed(fileno(p)); 2735 retcode=pclose(p); 2736 free_pipe_list(inner.list_head,0); 2737 debug_printf("pclosed, retcode=%d\n",retcode); 2738 /* XXX this process fails to trim a single trailing newline */ 2739 return retcode; 2740 } 2741 2742 static int parse_group(o_string *dest, struct p_context *ctx, 2743 struct in_str *input, int ch) 2744 { 2745 int rcode, endch=0; 2746 struct p_context sub; 2747 struct child_prog *child = ctx->child; 2748 if (child->argv) { 2749 syntax(); 2750 return 1; /* syntax error, groups and arglists don't mix */ 2751 } 2752 initialize_context(&sub); 2753 switch(ch) { 2754 case '(': endch=')'; child->subshell=1; break; 2755 case '{': endch='}'; break; 2756 default: syntax(); /* really logic error */ 2757 } 2758 rcode=parse_stream(dest,&sub,input,endch); 2759 done_word(dest,&sub); /* finish off the final word in the subcontext */ 2760 done_pipe(&sub, PIPE_SEQ); /* and the final command there, too */ 2761 child->group = sub.list_head; 2762 return rcode; 2763 /* child remains "open", available for possible redirects */ 2764 } 2765 #endif 2766 2767 /* basically useful version until someone wants to get fancier, 2768 * see the bash man page under "Parameter Expansion" */ 2769 static char *lookup_param(char *src) 2770 { 2771 char *p; 2772 char *sep; 2773 char *default_val = NULL; 2774 int assign = 0; 2775 int expand_empty = 0; 2776 2777 if (!src) 2778 return NULL; 2779 2780 sep = strchr(src, ':'); 2781 2782 if (sep) { 2783 *sep = '\0'; 2784 if (*(sep + 1) == '-') 2785 default_val = sep+2; 2786 if (*(sep + 1) == '=') { 2787 default_val = sep+2; 2788 assign = 1; 2789 } 2790 if (*(sep + 1) == '+') { 2791 default_val = sep+2; 2792 expand_empty = 1; 2793 } 2794 } 2795 2796 p = env_get(src); 2797 if (!p) 2798 p = get_local_var(src); 2799 2800 if (!p || strlen(p) == 0) { 2801 p = default_val; 2802 if (assign) { 2803 char *var = malloc(strlen(src)+strlen(default_val)+2); 2804 if (var) { 2805 sprintf(var, "%s=%s", src, default_val); 2806 set_local_var(var, 0); 2807 } 2808 free(var); 2809 } 2810 } else if (expand_empty) { 2811 p += strlen(p); 2812 } 2813 2814 if (sep) 2815 *sep = ':'; 2816 2817 return p; 2818 } 2819 2820 #ifdef __U_BOOT__ 2821 static char *get_dollar_var(char ch) 2822 { 2823 static char buf[40]; 2824 2825 buf[0] = '\0'; 2826 switch (ch) { 2827 case '?': 2828 sprintf(buf, "%u", (unsigned int)last_return_code); 2829 break; 2830 default: 2831 return NULL; 2832 } 2833 return buf; 2834 } 2835 #endif 2836 2837 /* return code: 0 for OK, 1 for syntax error */ 2838 static int handle_dollar(o_string *dest, struct p_context *ctx, struct in_str *input) 2839 { 2840 #ifndef __U_BOOT__ 2841 int i, advance=0; 2842 #else 2843 int advance=0; 2844 #endif 2845 #ifndef __U_BOOT__ 2846 char sep[]=" "; 2847 #endif 2848 int ch = input->peek(input); /* first character after the $ */ 2849 debug_printf("handle_dollar: ch=%c\n",ch); 2850 if (isalpha(ch)) { 2851 b_addchr(dest, SPECIAL_VAR_SYMBOL); 2852 ctx->child->sp++; 2853 while(ch=b_peek(input),isalnum(ch) || ch=='_') { 2854 b_getch(input); 2855 b_addchr(dest,ch); 2856 } 2857 b_addchr(dest, SPECIAL_VAR_SYMBOL); 2858 #ifndef __U_BOOT__ 2859 } else if (isdigit(ch)) { 2860 i = ch-'0'; /* XXX is $0 special? */ 2861 if (i<global_argc) { 2862 parse_string(dest, ctx, global_argv[i]); /* recursion */ 2863 } 2864 advance = 1; 2865 #endif 2866 } else switch (ch) { 2867 #ifndef __U_BOOT__ 2868 case '$': 2869 b_adduint(dest,getpid()); 2870 advance = 1; 2871 break; 2872 case '!': 2873 if (last_bg_pid > 0) b_adduint(dest, last_bg_pid); 2874 advance = 1; 2875 break; 2876 #endif 2877 case '?': 2878 #ifndef __U_BOOT__ 2879 b_adduint(dest,last_return_code); 2880 #else 2881 ctx->child->sp++; 2882 b_addchr(dest, SPECIAL_VAR_SYMBOL); 2883 b_addchr(dest, '$'); 2884 b_addchr(dest, '?'); 2885 b_addchr(dest, SPECIAL_VAR_SYMBOL); 2886 #endif 2887 advance = 1; 2888 break; 2889 #ifndef __U_BOOT__ 2890 case '#': 2891 b_adduint(dest,global_argc ? global_argc-1 : 0); 2892 advance = 1; 2893 break; 2894 #endif 2895 case '{': 2896 b_addchr(dest, SPECIAL_VAR_SYMBOL); 2897 ctx->child->sp++; 2898 b_getch(input); 2899 /* XXX maybe someone will try to escape the '}' */ 2900 while(ch=b_getch(input),ch!=EOF && ch!='}') { 2901 b_addchr(dest,ch); 2902 } 2903 if (ch != '}') { 2904 syntax(); 2905 return 1; 2906 } 2907 b_addchr(dest, SPECIAL_VAR_SYMBOL); 2908 break; 2909 #ifndef __U_BOOT__ 2910 case '(': 2911 b_getch(input); 2912 process_command_subs(dest, ctx, input, ')'); 2913 break; 2914 case '*': 2915 sep[0]=ifs[0]; 2916 for (i=1; i<global_argc; i++) { 2917 parse_string(dest, ctx, global_argv[i]); 2918 if (i+1 < global_argc) parse_string(dest, ctx, sep); 2919 } 2920 break; 2921 case '@': 2922 case '-': 2923 case '_': 2924 /* still unhandled, but should be eventually */ 2925 error_msg("unhandled syntax: $%c",ch); 2926 return 1; 2927 break; 2928 #endif 2929 default: 2930 b_addqchr(dest,'$',dest->quote); 2931 } 2932 /* Eat the character if the flag was set. If the compiler 2933 * is smart enough, we could substitute "b_getch(input);" 2934 * for all the "advance = 1;" above, and also end up with 2935 * a nice size-optimized program. Hah! That'll be the day. 2936 */ 2937 if (advance) b_getch(input); 2938 return 0; 2939 } 2940 2941 #ifndef __U_BOOT__ 2942 int parse_string(o_string *dest, struct p_context *ctx, const char *src) 2943 { 2944 struct in_str foo; 2945 setup_string_in_str(&foo, src); 2946 return parse_stream(dest, ctx, &foo, '\0'); 2947 } 2948 #endif 2949 2950 /* return code is 0 for normal exit, 1 for syntax error */ 2951 static int parse_stream(o_string *dest, struct p_context *ctx, 2952 struct in_str *input, int end_trigger) 2953 { 2954 unsigned int ch, m; 2955 #ifndef __U_BOOT__ 2956 int redir_fd; 2957 redir_type redir_style; 2958 #endif 2959 int next; 2960 2961 /* Only double-quote state is handled in the state variable dest->quote. 2962 * A single-quote triggers a bypass of the main loop until its mate is 2963 * found. When recursing, quote state is passed in via dest->quote. */ 2964 2965 debug_printf("parse_stream, end_trigger=%d\n",end_trigger); 2966 while ((ch=b_getch(input))!=EOF) { 2967 m = map[ch]; 2968 #ifdef __U_BOOT__ 2969 if (input->__promptme == 0) return 1; 2970 #endif 2971 next = (ch == '\n') ? 0 : b_peek(input); 2972 2973 debug_printf("parse_stream: ch=%c (%d) m=%d quote=%d - %c\n", 2974 ch >= ' ' ? ch : '.', ch, m, 2975 dest->quote, ctx->stack == NULL ? '*' : '.'); 2976 2977 if (m==0 || ((m==1 || m==2) && dest->quote)) { 2978 b_addqchr(dest, ch, dest->quote); 2979 } else { 2980 if (m==2) { /* unquoted IFS */ 2981 if (done_word(dest, ctx)) { 2982 return 1; 2983 } 2984 /* If we aren't performing a substitution, treat a newline as a 2985 * command separator. */ 2986 if (end_trigger != '\0' && ch=='\n') 2987 done_pipe(ctx,PIPE_SEQ); 2988 } 2989 if (ch == end_trigger && !dest->quote && ctx->w==RES_NONE) { 2990 debug_printf("leaving parse_stream (triggered)\n"); 2991 return 0; 2992 } 2993 #if 0 2994 if (ch=='\n') { 2995 /* Yahoo! Time to run with it! */ 2996 done_pipe(ctx,PIPE_SEQ); 2997 run_list(ctx->list_head); 2998 initialize_context(ctx); 2999 } 3000 #endif 3001 if (m!=2) switch (ch) { 3002 case '#': 3003 if (dest->length == 0 && !dest->quote) { 3004 while(ch=b_peek(input),ch!=EOF && ch!='\n') { b_getch(input); } 3005 } else { 3006 b_addqchr(dest, ch, dest->quote); 3007 } 3008 break; 3009 case '\\': 3010 if (next == EOF) { 3011 syntax(); 3012 return 1; 3013 } 3014 b_addqchr(dest, '\\', dest->quote); 3015 b_addqchr(dest, b_getch(input), dest->quote); 3016 break; 3017 case '$': 3018 if (handle_dollar(dest, ctx, input)!=0) return 1; 3019 break; 3020 case '\'': 3021 dest->nonnull = 1; 3022 while(ch=b_getch(input),ch!=EOF && ch!='\'') { 3023 #ifdef __U_BOOT__ 3024 if(input->__promptme == 0) return 1; 3025 #endif 3026 b_addchr(dest,ch); 3027 } 3028 if (ch==EOF) { 3029 syntax(); 3030 return 1; 3031 } 3032 break; 3033 case '"': 3034 dest->nonnull = 1; 3035 dest->quote = !dest->quote; 3036 break; 3037 #ifndef __U_BOOT__ 3038 case '`': 3039 process_command_subs(dest, ctx, input, '`'); 3040 break; 3041 case '>': 3042 redir_fd = redirect_opt_num(dest); 3043 done_word(dest, ctx); 3044 redir_style=REDIRECT_OVERWRITE; 3045 if (next == '>') { 3046 redir_style=REDIRECT_APPEND; 3047 b_getch(input); 3048 } else if (next == '(') { 3049 syntax(); /* until we support >(list) Process Substitution */ 3050 return 1; 3051 } 3052 setup_redirect(ctx, redir_fd, redir_style, input); 3053 break; 3054 case '<': 3055 redir_fd = redirect_opt_num(dest); 3056 done_word(dest, ctx); 3057 redir_style=REDIRECT_INPUT; 3058 if (next == '<') { 3059 redir_style=REDIRECT_HEREIS; 3060 b_getch(input); 3061 } else if (next == '>') { 3062 redir_style=REDIRECT_IO; 3063 b_getch(input); 3064 } else if (next == '(') { 3065 syntax(); /* until we support <(list) Process Substitution */ 3066 return 1; 3067 } 3068 setup_redirect(ctx, redir_fd, redir_style, input); 3069 break; 3070 #endif 3071 case ';': 3072 done_word(dest, ctx); 3073 done_pipe(ctx,PIPE_SEQ); 3074 break; 3075 case '&': 3076 done_word(dest, ctx); 3077 if (next=='&') { 3078 b_getch(input); 3079 done_pipe(ctx,PIPE_AND); 3080 } else { 3081 #ifndef __U_BOOT__ 3082 done_pipe(ctx,PIPE_BG); 3083 #else 3084 syntax_err(); 3085 return 1; 3086 #endif 3087 } 3088 break; 3089 case '|': 3090 done_word(dest, ctx); 3091 if (next=='|') { 3092 b_getch(input); 3093 done_pipe(ctx,PIPE_OR); 3094 } else { 3095 /* we could pick up a file descriptor choice here 3096 * with redirect_opt_num(), but bash doesn't do it. 3097 * "echo foo 2| cat" yields "foo 2". */ 3098 #ifndef __U_BOOT__ 3099 done_command(ctx); 3100 #else 3101 syntax_err(); 3102 return 1; 3103 #endif 3104 } 3105 break; 3106 #ifndef __U_BOOT__ 3107 case '(': 3108 case '{': 3109 if (parse_group(dest, ctx, input, ch)!=0) return 1; 3110 break; 3111 case ')': 3112 case '}': 3113 syntax(); /* Proper use of this character caught by end_trigger */ 3114 return 1; 3115 break; 3116 #endif 3117 case SUBSTED_VAR_SYMBOL: 3118 dest->nonnull = 1; 3119 while (ch = b_getch(input), ch != EOF && 3120 ch != SUBSTED_VAR_SYMBOL) { 3121 debug_printf("subst, pass=%d\n", ch); 3122 if (input->__promptme == 0) 3123 return 1; 3124 b_addchr(dest, ch); 3125 } 3126 debug_printf("subst, term=%d\n", ch); 3127 if (ch == EOF) { 3128 syntax(); 3129 return 1; 3130 } 3131 break; 3132 default: 3133 syntax(); /* this is really an internal logic error */ 3134 return 1; 3135 } 3136 } 3137 } 3138 /* complain if quote? No, maybe we just finished a command substitution 3139 * that was quoted. Example: 3140 * $ echo "`cat foo` plus more" 3141 * and we just got the EOF generated by the subshell that ran "cat foo" 3142 * The only real complaint is if we got an EOF when end_trigger != '\0', 3143 * that is, we were really supposed to get end_trigger, and never got 3144 * one before the EOF. Can't use the standard "syntax error" return code, 3145 * so that parse_stream_outer can distinguish the EOF and exit smoothly. */ 3146 debug_printf("leaving parse_stream (EOF)\n"); 3147 if (end_trigger != '\0') return -1; 3148 return 0; 3149 } 3150 3151 static void mapset(const unsigned char *set, int code) 3152 { 3153 const unsigned char *s; 3154 for (s=set; *s; s++) map[*s] = code; 3155 } 3156 3157 static void update_ifs_map(void) 3158 { 3159 /* char *ifs and char map[256] are both globals. */ 3160 ifs = (uchar *)env_get("IFS"); 3161 if (ifs == NULL) ifs=(uchar *)" \t\n"; 3162 /* Precompute a list of 'flow through' behavior so it can be treated 3163 * quickly up front. Computation is necessary because of IFS. 3164 * Special case handling of IFS == " \t\n" is not implemented. 3165 * The map[] array only really needs two bits each, and on most machines 3166 * that would be faster because of the reduced L1 cache footprint. 3167 */ 3168 memset(map,0,sizeof(map)); /* most characters flow through always */ 3169 #ifndef __U_BOOT__ 3170 mapset((uchar *)"\\$'\"`", 3); /* never flow through */ 3171 mapset((uchar *)"<>;&|(){}#", 1); /* flow through if quoted */ 3172 #else 3173 { 3174 uchar subst[2] = {SUBSTED_VAR_SYMBOL, 0}; 3175 mapset(subst, 3); /* never flow through */ 3176 } 3177 mapset((uchar *)"\\$'\"", 3); /* never flow through */ 3178 mapset((uchar *)";&|#", 1); /* flow through if quoted */ 3179 #endif 3180 mapset(ifs, 2); /* also flow through if quoted */ 3181 } 3182 3183 /* most recursion does not come through here, the exeception is 3184 * from builtin_source() */ 3185 static int parse_stream_outer(struct in_str *inp, int flag) 3186 { 3187 3188 struct p_context ctx; 3189 o_string temp=NULL_O_STRING; 3190 int rcode; 3191 #ifdef __U_BOOT__ 3192 int code = 1; 3193 #endif 3194 do { 3195 ctx.type = flag; 3196 initialize_context(&ctx); 3197 update_ifs_map(); 3198 if (!(flag & FLAG_PARSE_SEMICOLON) || (flag & FLAG_REPARSING)) mapset((uchar *)";$&|", 0); 3199 inp->promptmode=1; 3200 rcode = parse_stream(&temp, &ctx, inp, 3201 flag & FLAG_CONT_ON_NEWLINE ? -1 : '\n'); 3202 #ifdef __U_BOOT__ 3203 if (rcode == 1) flag_repeat = 0; 3204 #endif 3205 if (rcode != 1 && ctx.old_flag != 0) { 3206 syntax(); 3207 #ifdef __U_BOOT__ 3208 flag_repeat = 0; 3209 #endif 3210 } 3211 if (rcode != 1 && ctx.old_flag == 0) { 3212 done_word(&temp, &ctx); 3213 done_pipe(&ctx,PIPE_SEQ); 3214 #ifndef __U_BOOT__ 3215 run_list(ctx.list_head); 3216 #else 3217 code = run_list(ctx.list_head); 3218 if (code == -2) { /* exit */ 3219 b_free(&temp); 3220 code = 0; 3221 /* XXX hackish way to not allow exit from main loop */ 3222 if (inp->peek == file_peek) { 3223 printf("exit not allowed from main input shell.\n"); 3224 continue; 3225 } 3226 break; 3227 } 3228 if (code == -1) 3229 flag_repeat = 0; 3230 #endif 3231 } else { 3232 if (ctx.old_flag != 0) { 3233 free(ctx.stack); 3234 b_reset(&temp); 3235 } 3236 #ifdef __U_BOOT__ 3237 if (inp->__promptme == 0) printf("<INTERRUPT>\n"); 3238 inp->__promptme = 1; 3239 #endif 3240 temp.nonnull = 0; 3241 temp.quote = 0; 3242 inp->p = NULL; 3243 free_pipe_list(ctx.list_head,0); 3244 } 3245 b_free(&temp); 3246 /* loop on syntax errors, return on EOF */ 3247 } while (rcode != -1 && !(flag & FLAG_EXIT_FROM_LOOP) && 3248 (inp->peek != static_peek || b_peek(inp))); 3249 #ifndef __U_BOOT__ 3250 return 0; 3251 #else 3252 return (code != 0) ? 1 : 0; 3253 #endif /* __U_BOOT__ */ 3254 } 3255 3256 #ifndef __U_BOOT__ 3257 static int parse_string_outer(const char *s, int flag) 3258 #else 3259 int parse_string_outer(const char *s, int flag) 3260 #endif /* __U_BOOT__ */ 3261 { 3262 struct in_str input; 3263 #ifdef __U_BOOT__ 3264 char *p = NULL; 3265 int rcode; 3266 if (!s) 3267 return 1; 3268 if (!*s) 3269 return 0; 3270 if (!(p = strchr(s, '\n')) || *++p) { 3271 p = xmalloc(strlen(s) + 2); 3272 strcpy(p, s); 3273 strcat(p, "\n"); 3274 setup_string_in_str(&input, p); 3275 rcode = parse_stream_outer(&input, flag); 3276 free(p); 3277 return rcode; 3278 } else { 3279 #endif 3280 setup_string_in_str(&input, s); 3281 return parse_stream_outer(&input, flag); 3282 #ifdef __U_BOOT__ 3283 } 3284 #endif 3285 } 3286 3287 #ifndef __U_BOOT__ 3288 static int parse_file_outer(FILE *f) 3289 #else 3290 int parse_file_outer(void) 3291 #endif 3292 { 3293 int rcode; 3294 struct in_str input; 3295 #ifndef __U_BOOT__ 3296 setup_file_in_str(&input, f); 3297 #else 3298 setup_file_in_str(&input); 3299 #endif 3300 rcode = parse_stream_outer(&input, FLAG_PARSE_SEMICOLON); 3301 return rcode; 3302 } 3303 3304 #ifdef __U_BOOT__ 3305 #ifdef CONFIG_NEEDS_MANUAL_RELOC 3306 static void u_boot_hush_reloc(void) 3307 { 3308 unsigned long addr; 3309 struct reserved_combo *r; 3310 3311 for (r=reserved_list; r<reserved_list+NRES; r++) { 3312 addr = (ulong) (r->literal) + gd->reloc_off; 3313 r->literal = (char *)addr; 3314 } 3315 } 3316 #endif 3317 3318 int u_boot_hush_start(void) 3319 { 3320 if (top_vars == NULL) { 3321 top_vars = malloc(sizeof(struct variables)); 3322 top_vars->name = "HUSH_VERSION"; 3323 top_vars->value = "0.01"; 3324 top_vars->next = NULL; 3325 top_vars->flg_export = 0; 3326 top_vars->flg_read_only = 1; 3327 #ifdef CONFIG_NEEDS_MANUAL_RELOC 3328 u_boot_hush_reloc(); 3329 #endif 3330 } 3331 return 0; 3332 } 3333 3334 static void *xmalloc(size_t size) 3335 { 3336 void *p = NULL; 3337 3338 if (!(p = malloc(size))) { 3339 printf("ERROR : memory not allocated\n"); 3340 for(;;); 3341 } 3342 return p; 3343 } 3344 3345 static void *xrealloc(void *ptr, size_t size) 3346 { 3347 void *p = NULL; 3348 3349 if (!(p = realloc(ptr, size))) { 3350 printf("ERROR : memory not allocated\n"); 3351 for(;;); 3352 } 3353 return p; 3354 } 3355 #endif /* __U_BOOT__ */ 3356 3357 #ifndef __U_BOOT__ 3358 /* Make sure we have a controlling tty. If we get started under a job 3359 * aware app (like bash for example), make sure we are now in charge so 3360 * we don't fight over who gets the foreground */ 3361 static void setup_job_control(void) 3362 { 3363 static pid_t shell_pgrp; 3364 /* Loop until we are in the foreground. */ 3365 while (tcgetpgrp (shell_terminal) != (shell_pgrp = getpgrp ())) 3366 kill (- shell_pgrp, SIGTTIN); 3367 3368 /* Ignore interactive and job-control signals. */ 3369 signal(SIGINT, SIG_IGN); 3370 signal(SIGQUIT, SIG_IGN); 3371 signal(SIGTERM, SIG_IGN); 3372 signal(SIGTSTP, SIG_IGN); 3373 signal(SIGTTIN, SIG_IGN); 3374 signal(SIGTTOU, SIG_IGN); 3375 signal(SIGCHLD, SIG_IGN); 3376 3377 /* Put ourselves in our own process group. */ 3378 setsid(); 3379 shell_pgrp = getpid (); 3380 setpgid (shell_pgrp, shell_pgrp); 3381 3382 /* Grab control of the terminal. */ 3383 tcsetpgrp(shell_terminal, shell_pgrp); 3384 } 3385 3386 int hush_main(int argc, char * const *argv) 3387 { 3388 int opt; 3389 FILE *input; 3390 char **e = environ; 3391 3392 /* XXX what should these be while sourcing /etc/profile? */ 3393 global_argc = argc; 3394 global_argv = argv; 3395 3396 /* (re?) initialize globals. Sometimes hush_main() ends up calling 3397 * hush_main(), therefore we cannot rely on the BSS to zero out this 3398 * stuff. Reset these to 0 every time. */ 3399 ifs = NULL; 3400 /* map[] is taken care of with call to update_ifs_map() */ 3401 fake_mode = 0; 3402 interactive = 0; 3403 close_me_head = NULL; 3404 last_bg_pid = 0; 3405 job_list = NULL; 3406 last_jobid = 0; 3407 3408 /* Initialize some more globals to non-zero values */ 3409 set_cwd(); 3410 #ifdef CONFIG_FEATURE_COMMAND_EDITING 3411 cmdedit_set_initial_prompt(); 3412 #else 3413 PS1 = NULL; 3414 #endif 3415 PS2 = "> "; 3416 3417 /* initialize our shell local variables with the values 3418 * currently living in the environment */ 3419 if (e) { 3420 for (; *e; e++) 3421 set_local_var(*e, 2); /* without call putenv() */ 3422 } 3423 3424 last_return_code=EXIT_SUCCESS; 3425 3426 3427 if (argv[0] && argv[0][0] == '-') { 3428 debug_printf("\nsourcing /etc/profile\n"); 3429 if ((input = fopen("/etc/profile", "r")) != NULL) { 3430 mark_open(fileno(input)); 3431 parse_file_outer(input); 3432 mark_closed(fileno(input)); 3433 fclose(input); 3434 } 3435 } 3436 input=stdin; 3437 3438 while ((opt = getopt(argc, argv, "c:xif")) > 0) { 3439 switch (opt) { 3440 case 'c': 3441 { 3442 global_argv = argv+optind; 3443 global_argc = argc-optind; 3444 opt = parse_string_outer(optarg, FLAG_PARSE_SEMICOLON); 3445 goto final_return; 3446 } 3447 break; 3448 case 'i': 3449 interactive++; 3450 break; 3451 case 'f': 3452 fake_mode++; 3453 break; 3454 default: 3455 #ifndef BB_VER 3456 fprintf(stderr, "Usage: sh [FILE]...\n" 3457 " or: sh -c command [args]...\n\n"); 3458 exit(EXIT_FAILURE); 3459 #else 3460 show_usage(); 3461 #endif 3462 } 3463 } 3464 /* A shell is interactive if the `-i' flag was given, or if all of 3465 * the following conditions are met: 3466 * no -c command 3467 * no arguments remaining or the -s flag given 3468 * standard input is a terminal 3469 * standard output is a terminal 3470 * Refer to Posix.2, the description of the `sh' utility. */ 3471 if (argv[optind]==NULL && input==stdin && 3472 isatty(fileno(stdin)) && isatty(fileno(stdout))) { 3473 interactive++; 3474 } 3475 3476 debug_printf("\ninteractive=%d\n", interactive); 3477 if (interactive) { 3478 /* Looks like they want an interactive shell */ 3479 #ifndef CONFIG_FEATURE_SH_EXTRA_QUIET 3480 printf( "\n\n" BB_BANNER " hush - the humble shell v0.01 (testing)\n"); 3481 printf( "Enter 'help' for a list of built-in commands.\n\n"); 3482 #endif 3483 setup_job_control(); 3484 } 3485 3486 if (argv[optind]==NULL) { 3487 opt=parse_file_outer(stdin); 3488 goto final_return; 3489 } 3490 3491 debug_printf("\nrunning script '%s'\n", argv[optind]); 3492 global_argv = argv+optind; 3493 global_argc = argc-optind; 3494 input = xfopen(argv[optind], "r"); 3495 opt = parse_file_outer(input); 3496 3497 #ifdef CONFIG_FEATURE_CLEAN_UP 3498 fclose(input); 3499 if (cwd && cwd != unknown) 3500 free((char*)cwd); 3501 { 3502 struct variables *cur, *tmp; 3503 for(cur = top_vars; cur; cur = tmp) { 3504 tmp = cur->next; 3505 if (!cur->flg_read_only) { 3506 free(cur->name); 3507 free(cur->value); 3508 free(cur); 3509 } 3510 } 3511 } 3512 #endif 3513 3514 final_return: 3515 return(opt?opt:last_return_code); 3516 } 3517 #endif 3518 3519 static char *insert_var_value(char *inp) 3520 { 3521 return insert_var_value_sub(inp, 0); 3522 } 3523 3524 static char *insert_var_value_sub(char *inp, int tag_subst) 3525 { 3526 int res_str_len = 0; 3527 int len; 3528 int done = 0; 3529 char *p, *p1, *res_str = NULL; 3530 3531 while ((p = strchr(inp, SPECIAL_VAR_SYMBOL))) { 3532 /* check the beginning of the string for normal characters */ 3533 if (p != inp) { 3534 /* copy any characters to the result string */ 3535 len = p - inp; 3536 res_str = xrealloc(res_str, (res_str_len + len)); 3537 strncpy((res_str + res_str_len), inp, len); 3538 res_str_len += len; 3539 } 3540 inp = ++p; 3541 /* find the ending marker */ 3542 p = strchr(inp, SPECIAL_VAR_SYMBOL); 3543 *p = '\0'; 3544 /* look up the value to substitute */ 3545 if ((p1 = lookup_param(inp))) { 3546 if (tag_subst) 3547 len = res_str_len + strlen(p1) + 2; 3548 else 3549 len = res_str_len + strlen(p1); 3550 res_str = xrealloc(res_str, (1 + len)); 3551 if (tag_subst) { 3552 /* 3553 * copy the variable value to the result 3554 * string 3555 */ 3556 strcpy((res_str + res_str_len + 1), p1); 3557 3558 /* 3559 * mark the replaced text to be accepted as 3560 * is 3561 */ 3562 res_str[res_str_len] = SUBSTED_VAR_SYMBOL; 3563 res_str[res_str_len + 1 + strlen(p1)] = 3564 SUBSTED_VAR_SYMBOL; 3565 } else 3566 /* 3567 * copy the variable value to the result 3568 * string 3569 */ 3570 strcpy((res_str + res_str_len), p1); 3571 3572 res_str_len = len; 3573 } 3574 *p = SPECIAL_VAR_SYMBOL; 3575 inp = ++p; 3576 done = 1; 3577 } 3578 if (done) { 3579 res_str = xrealloc(res_str, (1 + res_str_len + strlen(inp))); 3580 strcpy((res_str + res_str_len), inp); 3581 while ((p = strchr(res_str, '\n'))) { 3582 *p = ' '; 3583 } 3584 } 3585 return (res_str == NULL) ? inp : res_str; 3586 } 3587 3588 static char **make_list_in(char **inp, char *name) 3589 { 3590 int len, i; 3591 int name_len = strlen(name); 3592 int n = 0; 3593 char **list; 3594 char *p1, *p2, *p3; 3595 3596 /* create list of variable values */ 3597 list = xmalloc(sizeof(*list)); 3598 for (i = 0; inp[i]; i++) { 3599 p3 = insert_var_value(inp[i]); 3600 p1 = p3; 3601 while (*p1) { 3602 if (*p1 == ' ') { 3603 p1++; 3604 continue; 3605 } 3606 if ((p2 = strchr(p1, ' '))) { 3607 len = p2 - p1; 3608 } else { 3609 len = strlen(p1); 3610 p2 = p1 + len; 3611 } 3612 /* we use n + 2 in realloc for list,because we add 3613 * new element and then we will add NULL element */ 3614 list = xrealloc(list, sizeof(*list) * (n + 2)); 3615 list[n] = xmalloc(2 + name_len + len); 3616 strcpy(list[n], name); 3617 strcat(list[n], "="); 3618 strncat(list[n], p1, len); 3619 list[n++][name_len + len + 1] = '\0'; 3620 p1 = p2; 3621 } 3622 if (p3 != inp[i]) free(p3); 3623 } 3624 list[n] = NULL; 3625 return list; 3626 } 3627 3628 /* 3629 * Make new string for parser 3630 * inp - array of argument strings to flatten 3631 * nonnull - indicates argument was quoted when originally parsed 3632 */ 3633 static char *make_string(char **inp, int *nonnull) 3634 { 3635 char *p; 3636 char *str = NULL; 3637 int n; 3638 int len = 2; 3639 char *noeval_str; 3640 int noeval = 0; 3641 3642 noeval_str = get_local_var("HUSH_NO_EVAL"); 3643 if (noeval_str != NULL && *noeval_str != '0' && *noeval_str != '\0') 3644 noeval = 1; 3645 for (n = 0; inp[n]; n++) { 3646 p = insert_var_value_sub(inp[n], noeval); 3647 str = xrealloc(str, (len + strlen(p) + (2 * nonnull[n]))); 3648 if (n) { 3649 strcat(str, " "); 3650 } else { 3651 *str = '\0'; 3652 } 3653 if (nonnull[n]) 3654 strcat(str, "'"); 3655 strcat(str, p); 3656 if (nonnull[n]) 3657 strcat(str, "'"); 3658 len = strlen(str) + 3; 3659 if (p != inp[n]) free(p); 3660 } 3661 len = strlen(str); 3662 *(str + len) = '\n'; 3663 *(str + len + 1) = '\0'; 3664 return str; 3665 } 3666 3667 #ifdef __U_BOOT__ 3668 static int do_showvar(cmd_tbl_t *cmdtp, int flag, int argc, 3669 char * const argv[]) 3670 { 3671 int i, k; 3672 int rcode = 0; 3673 struct variables *cur; 3674 3675 if (argc == 1) { /* Print all env variables */ 3676 for (cur = top_vars; cur; cur = cur->next) { 3677 printf ("%s=%s\n", cur->name, cur->value); 3678 if (ctrlc ()) { 3679 puts ("\n ** Abort\n"); 3680 return 1; 3681 } 3682 } 3683 return 0; 3684 } 3685 for (i = 1; i < argc; ++i) { /* print single env variables */ 3686 char *name = argv[i]; 3687 3688 k = -1; 3689 for (cur = top_vars; cur; cur = cur->next) { 3690 if(strcmp (cur->name, name) == 0) { 3691 k = 0; 3692 printf ("%s=%s\n", cur->name, cur->value); 3693 } 3694 if (ctrlc ()) { 3695 puts ("\n ** Abort\n"); 3696 return 1; 3697 } 3698 } 3699 if (k < 0) { 3700 printf ("## Error: \"%s\" not defined\n", name); 3701 rcode ++; 3702 } 3703 } 3704 return rcode; 3705 } 3706 3707 U_BOOT_CMD( 3708 showvar, CONFIG_SYS_MAXARGS, 1, do_showvar, 3709 "print local hushshell variables", 3710 "\n - print values of all hushshell variables\n" 3711 "showvar name ...\n" 3712 " - print value of hushshell variable 'name'" 3713 ); 3714 3715 #endif 3716 /****************************************************************************/ 3717