1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * sh.c -- a prototype Bourne shell grammar parser 4 * Intended to follow the original Thompson and Ritchie 5 * "small and simple is beautiful" philosophy, which 6 * incidentally is a good match to today's BusyBox. 7 * 8 * Copyright (C) 2000,2001 Larry Doolittle <larry (at) doolittle.boa.org> 9 * 10 * Credits: 11 * The parser routines proper are all original material, first 12 * written Dec 2000 and Jan 2001 by Larry Doolittle. 13 * The execution engine, the builtins, and much of the underlying 14 * support has been adapted from busybox-0.49pre's lash, 15 * which is Copyright (C) 2000 by Lineo, Inc., and 16 * written by Erik Andersen <andersen (at) lineo.com>, <andersee (at) debian.org>. 17 * That, in turn, is based in part on ladsh.c, by Michael K. Johnson and 18 * Erik W. Troan, which they placed in the public domain. I don't know 19 * how much of the Johnson/Troan code has survived the repeated rewrites. 20 * Other credits: 21 * b_addchr() derived from similar w_addchar function in glibc-2.2 22 * setup_redirect(), redirect_opt_num(), and big chunks of main() 23 * and many builtins derived from contributions by Erik Andersen 24 * miscellaneous bugfixes from Matt Kraai 25 * 26 * There are two big (and related) architecture differences between 27 * this parser and the lash parser. One is that this version is 28 * actually designed from the ground up to understand nearly all 29 * of the Bourne grammar. The second, consequential change is that 30 * the parser and input reader have been turned inside out. Now, 31 * the parser is in control, and asks for input as needed. The old 32 * way had the input reader in control, and it asked for parsing to 33 * take place as needed. The new way makes it much easier to properly 34 * handle the recursion implicit in the various substitutions, especially 35 * across continuation lines. 36 * 37 * Bash grammar not implemented: (how many of these were in original sh?) 38 * $@ (those sure look like weird quoting rules) 39 * $_ 40 * ! negation operator for pipes 41 * &> and >& redirection of stdout+stderr 42 * Brace Expansion 43 * Tilde Expansion 44 * fancy forms of Parameter Expansion 45 * aliases 46 * Arithmetic Expansion 47 * <(list) and >(list) Process Substitution 48 * reserved words: case, esac, select, function 49 * Here Documents ( << word ) 50 * Functions 51 * Major bugs: 52 * job handling woefully incomplete and buggy 53 * reserved word execution woefully incomplete and buggy 54 * to-do: 55 * port selected bugfixes from post-0.49 busybox lash - done? 56 * finish implementing reserved words: for, while, until, do, done 57 * change { and } from special chars to reserved words 58 * builtins: break, continue, eval, return, set, trap, ulimit 59 * test magic exec 60 * handle children going into background 61 * clean up recognition of null pipes 62 * check setting of global_argc and global_argv 63 * control-C handling, probably with longjmp 64 * follow IFS rules more precisely, including update semantics 65 * figure out what to do with backslash-newline 66 * explain why we use signal instead of sigaction 67 * propagate syntax errors, die on resource errors? 68 * continuation lines, both explicit and implicit - done? 69 * memory leak finding and plugging - done? 70 * more testing, especially quoting rules and redirection 71 * document how quoting rules not precisely followed for variable assignments 72 * maybe change map[] to use 2-bit entries 73 * (eventually) remove all the printf's 74 */ 75 76 #define __U_BOOT__ 77 #ifdef __U_BOOT__ 78 #include <malloc.h> /* malloc, free, realloc*/ 79 #include <linux/ctype.h> /* isalpha, isdigit */ 80 #include <common.h> /* readline */ 81 #include <console.h> 82 #include <bootretry.h> 83 #include <cli.h> 84 #include <cli_hush.h> 85 #include <command.h> /* find_cmd */ 86 #ifndef CONFIG_SYS_PROMPT_HUSH_PS2 87 #define CONFIG_SYS_PROMPT_HUSH_PS2 "> " 88 #endif 89 #endif 90 #ifndef __U_BOOT__ 91 #include <ctype.h> /* isalpha, isdigit */ 92 #include <unistd.h> /* getpid */ 93 #include <stdlib.h> /* getenv, atoi */ 94 #include <string.h> /* strchr */ 95 #include <stdio.h> /* popen etc. */ 96 #include <glob.h> /* glob, of course */ 97 #include <stdarg.h> /* va_list */ 98 #include <errno.h> 99 #include <fcntl.h> 100 #include <getopt.h> /* should be pretty obvious */ 101 102 #include <sys/stat.h> /* ulimit */ 103 #include <sys/types.h> 104 #include <sys/wait.h> 105 #include <signal.h> 106 107 /* #include <dmalloc.h> */ 108 109 #if 1 110 #include "busybox.h" 111 #include "cmdedit.h" 112 #else 113 #define applet_name "hush" 114 #include "standalone.h" 115 #define hush_main main 116 #undef CONFIG_FEATURE_SH_FANCY_PROMPT 117 #define BB_BANNER 118 #endif 119 #endif 120 #define SPECIAL_VAR_SYMBOL 03 121 #define SUBSTED_VAR_SYMBOL 04 122 #ifndef __U_BOOT__ 123 #define FLAG_EXIT_FROM_LOOP 1 124 #define FLAG_PARSE_SEMICOLON (1 << 1) /* symbol ';' is special for parser */ 125 #define FLAG_REPARSING (1 << 2) /* >= 2nd pass */ 126 127 #endif 128 129 #ifdef __U_BOOT__ 130 DECLARE_GLOBAL_DATA_PTR; 131 132 #define EXIT_SUCCESS 0 133 #define EOF -1 134 #define syntax() syntax_err() 135 #define xstrdup strdup 136 #define error_msg printf 137 #else 138 typedef enum { 139 REDIRECT_INPUT = 1, 140 REDIRECT_OVERWRITE = 2, 141 REDIRECT_APPEND = 3, 142 REDIRECT_HEREIS = 4, 143 REDIRECT_IO = 5 144 } redir_type; 145 146 /* The descrip member of this structure is only used to make debugging 147 * output pretty */ 148 struct {int mode; int default_fd; char *descrip;} redir_table[] = { 149 { 0, 0, "()" }, 150 { O_RDONLY, 0, "<" }, 151 { O_CREAT|O_TRUNC|O_WRONLY, 1, ">" }, 152 { O_CREAT|O_APPEND|O_WRONLY, 1, ">>" }, 153 { O_RDONLY, -1, "<<" }, 154 { O_RDWR, 1, "<>" } 155 }; 156 #endif 157 158 typedef enum { 159 PIPE_SEQ = 1, 160 PIPE_AND = 2, 161 PIPE_OR = 3, 162 PIPE_BG = 4, 163 } pipe_style; 164 165 /* might eventually control execution */ 166 typedef enum { 167 RES_NONE = 0, 168 RES_IF = 1, 169 RES_THEN = 2, 170 RES_ELIF = 3, 171 RES_ELSE = 4, 172 RES_FI = 5, 173 RES_FOR = 6, 174 RES_WHILE = 7, 175 RES_UNTIL = 8, 176 RES_DO = 9, 177 RES_DONE = 10, 178 RES_XXXX = 11, 179 RES_IN = 12, 180 RES_SNTX = 13 181 } reserved_style; 182 #define FLAG_END (1<<RES_NONE) 183 #define FLAG_IF (1<<RES_IF) 184 #define FLAG_THEN (1<<RES_THEN) 185 #define FLAG_ELIF (1<<RES_ELIF) 186 #define FLAG_ELSE (1<<RES_ELSE) 187 #define FLAG_FI (1<<RES_FI) 188 #define FLAG_FOR (1<<RES_FOR) 189 #define FLAG_WHILE (1<<RES_WHILE) 190 #define FLAG_UNTIL (1<<RES_UNTIL) 191 #define FLAG_DO (1<<RES_DO) 192 #define FLAG_DONE (1<<RES_DONE) 193 #define FLAG_IN (1<<RES_IN) 194 #define FLAG_START (1<<RES_XXXX) 195 196 /* This holds pointers to the various results of parsing */ 197 struct p_context { 198 struct child_prog *child; 199 struct pipe *list_head; 200 struct pipe *pipe; 201 #ifndef __U_BOOT__ 202 struct redir_struct *pending_redirect; 203 #endif 204 reserved_style w; 205 int old_flag; /* for figuring out valid reserved words */ 206 struct p_context *stack; 207 int type; /* define type of parser : ";$" common or special symbol */ 208 /* How about quoting status? */ 209 }; 210 211 #ifndef __U_BOOT__ 212 struct redir_struct { 213 redir_type type; /* type of redirection */ 214 int fd; /* file descriptor being redirected */ 215 int dup; /* -1, or file descriptor being duplicated */ 216 struct redir_struct *next; /* pointer to the next redirect in the list */ 217 glob_t word; /* *word.gl_pathv is the filename */ 218 }; 219 #endif 220 221 struct child_prog { 222 #ifndef __U_BOOT__ 223 pid_t pid; /* 0 if exited */ 224 #endif 225 char **argv; /* program name and arguments */ 226 /* was quoted when parsed; copy of struct o_string.nonnull field */ 227 int *argv_nonnull; 228 #ifdef __U_BOOT__ 229 int argc; /* number of program arguments */ 230 #endif 231 struct pipe *group; /* if non-NULL, first in group or subshell */ 232 #ifndef __U_BOOT__ 233 int subshell; /* flag, non-zero if group must be forked */ 234 struct redir_struct *redirects; /* I/O redirections */ 235 glob_t glob_result; /* result of parameter globbing */ 236 int is_stopped; /* is the program currently running? */ 237 struct pipe *family; /* pointer back to the child's parent pipe */ 238 #endif 239 int sp; /* number of SPECIAL_VAR_SYMBOL */ 240 int type; 241 }; 242 243 struct pipe { 244 #ifndef __U_BOOT__ 245 int jobid; /* job number */ 246 #endif 247 int num_progs; /* total number of programs in job */ 248 #ifndef __U_BOOT__ 249 int running_progs; /* number of programs running */ 250 char *text; /* name of job */ 251 char *cmdbuf; /* buffer various argv's point into */ 252 pid_t pgrp; /* process group ID for the job */ 253 #endif 254 struct child_prog *progs; /* array of commands in pipe */ 255 struct pipe *next; /* to track background commands */ 256 #ifndef __U_BOOT__ 257 int stopped_progs; /* number of programs alive, but stopped */ 258 int job_context; /* bitmask defining current context */ 259 #endif 260 pipe_style followup; /* PIPE_BG, PIPE_SEQ, PIPE_OR, PIPE_AND */ 261 reserved_style r_mode; /* supports if, for, while, until */ 262 }; 263 264 #ifndef __U_BOOT__ 265 struct close_me { 266 int fd; 267 struct close_me *next; 268 }; 269 #endif 270 271 struct variables { 272 char *name; 273 char *value; 274 int flg_export; 275 int flg_read_only; 276 struct variables *next; 277 }; 278 279 /* globals, connect us to the outside world 280 * the first three support $?, $#, and $1 */ 281 #ifndef __U_BOOT__ 282 char **global_argv; 283 unsigned int global_argc; 284 #endif 285 static unsigned int last_return_code; 286 #ifndef __U_BOOT__ 287 extern char **environ; /* This is in <unistd.h>, but protected with __USE_GNU */ 288 #endif 289 290 /* "globals" within this file */ 291 static uchar *ifs; 292 static char map[256]; 293 #ifndef __U_BOOT__ 294 static int fake_mode; 295 static int interactive; 296 static struct close_me *close_me_head; 297 static const char *cwd; 298 static struct pipe *job_list; 299 static unsigned int last_bg_pid; 300 static unsigned int last_jobid; 301 static unsigned int shell_terminal; 302 static char *PS1; 303 static char *PS2; 304 struct variables shell_ver = { "HUSH_VERSION", "0.01", 1, 1, 0 }; 305 struct variables *top_vars = &shell_ver; 306 #else 307 static int flag_repeat = 0; 308 static int do_repeat = 0; 309 static struct variables *top_vars = NULL ; 310 #endif /*__U_BOOT__ */ 311 312 #define B_CHUNK (100) 313 #define B_NOSPAC 1 314 315 typedef struct { 316 char *data; 317 int length; 318 int maxlen; 319 int quote; 320 int nonnull; 321 } o_string; 322 #define NULL_O_STRING {NULL,0,0,0,0} 323 /* used for initialization: 324 o_string foo = NULL_O_STRING; */ 325 326 /* I can almost use ordinary FILE *. Is open_memstream() universally 327 * available? Where is it documented? */ 328 struct in_str { 329 const char *p; 330 #ifndef __U_BOOT__ 331 char peek_buf[2]; 332 #endif 333 int __promptme; 334 int promptmode; 335 #ifndef __U_BOOT__ 336 FILE *file; 337 #endif 338 int (*get) (struct in_str *); 339 int (*peek) (struct in_str *); 340 }; 341 #define b_getch(input) ((input)->get(input)) 342 #define b_peek(input) ((input)->peek(input)) 343 344 #ifndef __U_BOOT__ 345 #define JOB_STATUS_FORMAT "[%d] %-22s %.40s\n" 346 347 struct built_in_command { 348 char *cmd; /* name */ 349 char *descr; /* description */ 350 int (*function) (struct child_prog *); /* function ptr */ 351 }; 352 #endif 353 354 /* define DEBUG_SHELL for debugging output (obviously ;-)) */ 355 #if 0 356 #define DEBUG_SHELL 357 #endif 358 359 /* This should be in utility.c */ 360 #ifdef DEBUG_SHELL 361 #ifndef __U_BOOT__ 362 static void debug_printf(const char *format, ...) 363 { 364 va_list args; 365 va_start(args, format); 366 vfprintf(stderr, format, args); 367 va_end(args); 368 } 369 #else 370 #define debug_printf(fmt,args...) printf (fmt ,##args) 371 #endif 372 #else 373 static inline void debug_printf(const char *format, ...) { } 374 #endif 375 #define final_printf debug_printf 376 377 #ifdef __U_BOOT__ 378 static void syntax_err(void) { 379 printf("syntax error\n"); 380 } 381 #else 382 static void __syntax(char *file, int line) { 383 error_msg("syntax error %s:%d", file, line); 384 } 385 #define syntax() __syntax(__FILE__, __LINE__) 386 #endif 387 388 #ifdef __U_BOOT__ 389 static void *xmalloc(size_t size); 390 static void *xrealloc(void *ptr, size_t size); 391 #else 392 /* Index of subroutines: */ 393 /* function prototypes for builtins */ 394 static int builtin_cd(struct child_prog *child); 395 static int builtin_env(struct child_prog *child); 396 static int builtin_eval(struct child_prog *child); 397 static int builtin_exec(struct child_prog *child); 398 static int builtin_exit(struct child_prog *child); 399 static int builtin_export(struct child_prog *child); 400 static int builtin_fg_bg(struct child_prog *child); 401 static int builtin_help(struct child_prog *child); 402 static int builtin_jobs(struct child_prog *child); 403 static int builtin_pwd(struct child_prog *child); 404 static int builtin_read(struct child_prog *child); 405 static int builtin_set(struct child_prog *child); 406 static int builtin_shift(struct child_prog *child); 407 static int builtin_source(struct child_prog *child); 408 static int builtin_umask(struct child_prog *child); 409 static int builtin_unset(struct child_prog *child); 410 static int builtin_not_written(struct child_prog *child); 411 #endif 412 /* o_string manipulation: */ 413 static int b_check_space(o_string *o, int len); 414 static int b_addchr(o_string *o, int ch); 415 static void b_reset(o_string *o); 416 static int b_addqchr(o_string *o, int ch, int quote); 417 #ifndef __U_BOOT__ 418 static int b_adduint(o_string *o, unsigned int i); 419 #endif 420 /* in_str manipulations: */ 421 static int static_get(struct in_str *i); 422 static int static_peek(struct in_str *i); 423 static int file_get(struct in_str *i); 424 static int file_peek(struct in_str *i); 425 #ifndef __U_BOOT__ 426 static void setup_file_in_str(struct in_str *i, FILE *f); 427 #else 428 static void setup_file_in_str(struct in_str *i); 429 #endif 430 static void setup_string_in_str(struct in_str *i, const char *s); 431 #ifndef __U_BOOT__ 432 /* close_me manipulations: */ 433 static void mark_open(int fd); 434 static void mark_closed(int fd); 435 static void close_all(void); 436 #endif 437 /* "run" the final data structures: */ 438 static char *indenter(int i); 439 static int free_pipe_list(struct pipe *head, int indent); 440 static int free_pipe(struct pipe *pi, int indent); 441 /* really run the final data structures: */ 442 #ifndef __U_BOOT__ 443 static int setup_redirects(struct child_prog *prog, int squirrel[]); 444 #endif 445 static int run_list_real(struct pipe *pi); 446 #ifndef __U_BOOT__ 447 static void pseudo_exec(struct child_prog *child) __attribute__ ((noreturn)); 448 #endif 449 static int run_pipe_real(struct pipe *pi); 450 /* extended glob support: */ 451 #ifndef __U_BOOT__ 452 static int globhack(const char *src, int flags, glob_t *pglob); 453 static int glob_needed(const char *s); 454 static int xglob(o_string *dest, int flags, glob_t *pglob); 455 #endif 456 /* variable assignment: */ 457 static int is_assignment(const char *s); 458 /* data structure manipulation: */ 459 #ifndef __U_BOOT__ 460 static int setup_redirect(struct p_context *ctx, int fd, redir_type style, struct in_str *input); 461 #endif 462 static void initialize_context(struct p_context *ctx); 463 static int done_word(o_string *dest, struct p_context *ctx); 464 static int done_command(struct p_context *ctx); 465 static int done_pipe(struct p_context *ctx, pipe_style type); 466 /* primary string parsing: */ 467 #ifndef __U_BOOT__ 468 static int redirect_dup_num(struct in_str *input); 469 static int redirect_opt_num(o_string *o); 470 static int process_command_subs(o_string *dest, struct p_context *ctx, struct in_str *input, int subst_end); 471 static int parse_group(o_string *dest, struct p_context *ctx, struct in_str *input, int ch); 472 #endif 473 static char *lookup_param(char *src); 474 static char *make_string(char **inp, int *nonnull); 475 static int handle_dollar(o_string *dest, struct p_context *ctx, struct in_str *input); 476 #ifndef __U_BOOT__ 477 static int parse_string(o_string *dest, struct p_context *ctx, const char *src); 478 #endif 479 static int parse_stream(o_string *dest, struct p_context *ctx, struct in_str *input0, int end_trigger); 480 /* setup: */ 481 static int parse_stream_outer(struct in_str *inp, int flag); 482 #ifndef __U_BOOT__ 483 static int parse_string_outer(const char *s, int flag); 484 static int parse_file_outer(FILE *f); 485 #endif 486 #ifndef __U_BOOT__ 487 /* job management: */ 488 static int checkjobs(struct pipe* fg_pipe); 489 static void insert_bg_job(struct pipe *pi); 490 static void remove_bg_job(struct pipe *pi); 491 #endif 492 /* local variable support */ 493 static char **make_list_in(char **inp, char *name); 494 static char *insert_var_value(char *inp); 495 static char *insert_var_value_sub(char *inp, int tag_subst); 496 497 #ifndef __U_BOOT__ 498 /* Table of built-in functions. They can be forked or not, depending on 499 * context: within pipes, they fork. As simple commands, they do not. 500 * When used in non-forking context, they can change global variables 501 * in the parent shell process. If forked, of course they can not. 502 * For example, 'unset foo | whatever' will parse and run, but foo will 503 * still be set at the end. */ 504 static struct built_in_command bltins[] = { 505 {"bg", "Resume a job in the background", builtin_fg_bg}, 506 {"break", "Exit for, while or until loop", builtin_not_written}, 507 {"cd", "Change working directory", builtin_cd}, 508 {"continue", "Continue for, while or until loop", builtin_not_written}, 509 {"env", "Print all environment variables", builtin_env}, 510 {"eval", "Construct and run shell command", builtin_eval}, 511 {"exec", "Exec command, replacing this shell with the exec'd process", 512 builtin_exec}, 513 {"exit", "Exit from shell()", builtin_exit}, 514 {"export", "Set environment variable", builtin_export}, 515 {"fg", "Bring job into the foreground", builtin_fg_bg}, 516 {"jobs", "Lists the active jobs", builtin_jobs}, 517 {"pwd", "Print current directory", builtin_pwd}, 518 {"read", "Input environment variable", builtin_read}, 519 {"return", "Return from a function", builtin_not_written}, 520 {"set", "Set/unset shell local variables", builtin_set}, 521 {"shift", "Shift positional parameters", builtin_shift}, 522 {"trap", "Trap signals", builtin_not_written}, 523 {"ulimit","Controls resource limits", builtin_not_written}, 524 {"umask","Sets file creation mask", builtin_umask}, 525 {"unset", "Unset environment variable", builtin_unset}, 526 {".", "Source-in and run commands in a file", builtin_source}, 527 {"help", "List shell built-in commands", builtin_help}, 528 {NULL, NULL, NULL} 529 }; 530 531 static const char *set_cwd(void) 532 { 533 if(cwd==unknown) 534 cwd = NULL; /* xgetcwd(arg) called free(arg) */ 535 cwd = xgetcwd((char *)cwd); 536 if (!cwd) 537 cwd = unknown; 538 return cwd; 539 } 540 541 /* built-in 'eval' handler */ 542 static int builtin_eval(struct child_prog *child) 543 { 544 char *str = NULL; 545 int rcode = EXIT_SUCCESS; 546 547 if (child->argv[1]) { 548 str = make_string(child->argv + 1); 549 parse_string_outer(str, FLAG_EXIT_FROM_LOOP | 550 FLAG_PARSE_SEMICOLON); 551 free(str); 552 rcode = last_return_code; 553 } 554 return rcode; 555 } 556 557 /* built-in 'cd <path>' handler */ 558 static int builtin_cd(struct child_prog *child) 559 { 560 char *newdir; 561 if (child->argv[1] == NULL) 562 newdir = env_get("HOME"); 563 else 564 newdir = child->argv[1]; 565 if (chdir(newdir)) { 566 printf("cd: %s: %s\n", newdir, strerror(errno)); 567 return EXIT_FAILURE; 568 } 569 set_cwd(); 570 return EXIT_SUCCESS; 571 } 572 573 /* built-in 'env' handler */ 574 static int builtin_env(struct child_prog *dummy) 575 { 576 char **e = environ; 577 if (e == NULL) return EXIT_FAILURE; 578 for (; *e; e++) { 579 puts(*e); 580 } 581 return EXIT_SUCCESS; 582 } 583 584 /* built-in 'exec' handler */ 585 static int builtin_exec(struct child_prog *child) 586 { 587 if (child->argv[1] == NULL) 588 return EXIT_SUCCESS; /* Really? */ 589 child->argv++; 590 pseudo_exec(child); 591 /* never returns */ 592 } 593 594 /* built-in 'exit' handler */ 595 static int builtin_exit(struct child_prog *child) 596 { 597 if (child->argv[1] == NULL) 598 exit(last_return_code); 599 exit (atoi(child->argv[1])); 600 } 601 602 /* built-in 'export VAR=value' handler */ 603 static int builtin_export(struct child_prog *child) 604 { 605 int res = 0; 606 char *name = child->argv[1]; 607 608 if (name == NULL) { 609 return (builtin_env(child)); 610 } 611 612 name = strdup(name); 613 614 if(name) { 615 char *value = strchr(name, '='); 616 617 if (!value) { 618 char *tmp; 619 /* They are exporting something without an =VALUE */ 620 621 value = get_local_var(name); 622 if (value) { 623 size_t ln = strlen(name); 624 625 tmp = realloc(name, ln+strlen(value)+2); 626 if(tmp==NULL) 627 res = -1; 628 else { 629 sprintf(tmp+ln, "=%s", value); 630 name = tmp; 631 } 632 } else { 633 /* bash does not return an error when trying to export 634 * an undefined variable. Do likewise. */ 635 res = 1; 636 } 637 } 638 } 639 if (res<0) 640 perror_msg("export"); 641 else if(res==0) 642 res = set_local_var(name, 1); 643 else 644 res = 0; 645 free(name); 646 return res; 647 } 648 649 /* built-in 'fg' and 'bg' handler */ 650 static int builtin_fg_bg(struct child_prog *child) 651 { 652 int i, jobnum; 653 struct pipe *pi=NULL; 654 655 if (!interactive) 656 return EXIT_FAILURE; 657 /* If they gave us no args, assume they want the last backgrounded task */ 658 if (!child->argv[1]) { 659 for (pi = job_list; pi; pi = pi->next) { 660 if (pi->jobid == last_jobid) { 661 break; 662 } 663 } 664 if (!pi) { 665 error_msg("%s: no current job", child->argv[0]); 666 return EXIT_FAILURE; 667 } 668 } else { 669 if (sscanf(child->argv[1], "%%%d", &jobnum) != 1) { 670 error_msg("%s: bad argument '%s'", child->argv[0], child->argv[1]); 671 return EXIT_FAILURE; 672 } 673 for (pi = job_list; pi; pi = pi->next) { 674 if (pi->jobid == jobnum) { 675 break; 676 } 677 } 678 if (!pi) { 679 error_msg("%s: %d: no such job", child->argv[0], jobnum); 680 return EXIT_FAILURE; 681 } 682 } 683 684 if (*child->argv[0] == 'f') { 685 /* Put the job into the foreground. */ 686 tcsetpgrp(shell_terminal, pi->pgrp); 687 } 688 689 /* Restart the processes in the job */ 690 for (i = 0; i < pi->num_progs; i++) 691 pi->progs[i].is_stopped = 0; 692 693 if ( (i=kill(- pi->pgrp, SIGCONT)) < 0) { 694 if (i == ESRCH) { 695 remove_bg_job(pi); 696 } else { 697 perror_msg("kill (SIGCONT)"); 698 } 699 } 700 701 pi->stopped_progs = 0; 702 return EXIT_SUCCESS; 703 } 704 705 /* built-in 'help' handler */ 706 static int builtin_help(struct child_prog *dummy) 707 { 708 struct built_in_command *x; 709 710 printf("\nBuilt-in commands:\n"); 711 printf("-------------------\n"); 712 for (x = bltins; x->cmd; x++) { 713 if (x->descr==NULL) 714 continue; 715 printf("%s\t%s\n", x->cmd, x->descr); 716 } 717 printf("\n\n"); 718 return EXIT_SUCCESS; 719 } 720 721 /* built-in 'jobs' handler */ 722 static int builtin_jobs(struct child_prog *child) 723 { 724 struct pipe *job; 725 char *status_string; 726 727 for (job = job_list; job; job = job->next) { 728 if (job->running_progs == job->stopped_progs) 729 status_string = "Stopped"; 730 else 731 status_string = "Running"; 732 733 printf(JOB_STATUS_FORMAT, job->jobid, status_string, job->text); 734 } 735 return EXIT_SUCCESS; 736 } 737 738 739 /* built-in 'pwd' handler */ 740 static int builtin_pwd(struct child_prog *dummy) 741 { 742 puts(set_cwd()); 743 return EXIT_SUCCESS; 744 } 745 746 /* built-in 'read VAR' handler */ 747 static int builtin_read(struct child_prog *child) 748 { 749 int res; 750 751 if (child->argv[1]) { 752 char string[BUFSIZ]; 753 char *var = 0; 754 755 string[0] = 0; /* In case stdin has only EOF */ 756 /* read string */ 757 fgets(string, sizeof(string), stdin); 758 chomp(string); 759 var = malloc(strlen(child->argv[1])+strlen(string)+2); 760 if(var) { 761 sprintf(var, "%s=%s", child->argv[1], string); 762 res = set_local_var(var, 0); 763 } else 764 res = -1; 765 if (res) 766 fprintf(stderr, "read: %m\n"); 767 free(var); /* So not move up to avoid breaking errno */ 768 return res; 769 } else { 770 do res=getchar(); while(res!='\n' && res!=EOF); 771 return 0; 772 } 773 } 774 775 /* built-in 'set VAR=value' handler */ 776 static int builtin_set(struct child_prog *child) 777 { 778 char *temp = child->argv[1]; 779 struct variables *e; 780 781 if (temp == NULL) 782 for(e = top_vars; e; e=e->next) 783 printf("%s=%s\n", e->name, e->value); 784 else 785 set_local_var(temp, 0); 786 787 return EXIT_SUCCESS; 788 } 789 790 791 /* Built-in 'shift' handler */ 792 static int builtin_shift(struct child_prog *child) 793 { 794 int n=1; 795 if (child->argv[1]) { 796 n=atoi(child->argv[1]); 797 } 798 if (n>=0 && n<global_argc) { 799 /* XXX This probably breaks $0 */ 800 global_argc -= n; 801 global_argv += n; 802 return EXIT_SUCCESS; 803 } else { 804 return EXIT_FAILURE; 805 } 806 } 807 808 /* Built-in '.' handler (read-in and execute commands from file) */ 809 static int builtin_source(struct child_prog *child) 810 { 811 FILE *input; 812 int status; 813 814 if (child->argv[1] == NULL) 815 return EXIT_FAILURE; 816 817 /* XXX search through $PATH is missing */ 818 input = fopen(child->argv[1], "r"); 819 if (!input) { 820 error_msg("Couldn't open file '%s'", child->argv[1]); 821 return EXIT_FAILURE; 822 } 823 824 /* Now run the file */ 825 /* XXX argv and argc are broken; need to save old global_argv 826 * (pointer only is OK!) on this stack frame, 827 * set global_argv=child->argv+1, recurse, and restore. */ 828 mark_open(fileno(input)); 829 status = parse_file_outer(input); 830 mark_closed(fileno(input)); 831 fclose(input); 832 return (status); 833 } 834 835 static int builtin_umask(struct child_prog *child) 836 { 837 mode_t new_umask; 838 const char *arg = child->argv[1]; 839 char *end; 840 if (arg) { 841 new_umask=strtoul(arg, &end, 8); 842 if (*end!='\0' || end == arg) { 843 return EXIT_FAILURE; 844 } 845 } else { 846 printf("%.3o\n", (unsigned int) (new_umask=umask(0))); 847 } 848 umask(new_umask); 849 return EXIT_SUCCESS; 850 } 851 852 /* built-in 'unset VAR' handler */ 853 static int builtin_unset(struct child_prog *child) 854 { 855 /* bash returned already true */ 856 unset_local_var(child->argv[1]); 857 return EXIT_SUCCESS; 858 } 859 860 static int builtin_not_written(struct child_prog *child) 861 { 862 printf("builtin_%s not written\n",child->argv[0]); 863 return EXIT_FAILURE; 864 } 865 #endif 866 867 static int b_check_space(o_string *o, int len) 868 { 869 /* It would be easy to drop a more restrictive policy 870 * in here, such as setting a maximum string length */ 871 if (o->length + len > o->maxlen) { 872 char *old_data = o->data; 873 /* assert (data == NULL || o->maxlen != 0); */ 874 o->maxlen += max(2*len, B_CHUNK); 875 o->data = realloc(o->data, 1 + o->maxlen); 876 if (o->data == NULL) { 877 free(old_data); 878 } 879 } 880 return o->data == NULL; 881 } 882 883 static int b_addchr(o_string *o, int ch) 884 { 885 debug_printf("b_addchr: %c %d %p\n", ch, o->length, o); 886 if (b_check_space(o, 1)) return B_NOSPAC; 887 o->data[o->length] = ch; 888 o->length++; 889 o->data[o->length] = '\0'; 890 return 0; 891 } 892 893 static void b_reset(o_string *o) 894 { 895 o->length = 0; 896 o->nonnull = 0; 897 if (o->data != NULL) *o->data = '\0'; 898 } 899 900 static void b_free(o_string *o) 901 { 902 b_reset(o); 903 free(o->data); 904 o->data = NULL; 905 o->maxlen = 0; 906 } 907 908 /* My analysis of quoting semantics tells me that state information 909 * is associated with a destination, not a source. 910 */ 911 static int b_addqchr(o_string *o, int ch, int quote) 912 { 913 if (quote && strchr("*?[\\",ch)) { 914 int rc; 915 rc = b_addchr(o, '\\'); 916 if (rc) return rc; 917 } 918 return b_addchr(o, ch); 919 } 920 921 #ifndef __U_BOOT__ 922 static int b_adduint(o_string *o, unsigned int i) 923 { 924 int r; 925 char *p = simple_itoa(i); 926 /* no escape checking necessary */ 927 do r=b_addchr(o, *p++); while (r==0 && *p); 928 return r; 929 } 930 #endif 931 932 static int static_get(struct in_str *i) 933 { 934 int ch = *i->p++; 935 if (ch=='\0') return EOF; 936 return ch; 937 } 938 939 static int static_peek(struct in_str *i) 940 { 941 return *i->p; 942 } 943 944 #ifndef __U_BOOT__ 945 static inline void cmdedit_set_initial_prompt(void) 946 { 947 #ifndef CONFIG_FEATURE_SH_FANCY_PROMPT 948 PS1 = NULL; 949 #else 950 PS1 = env_get("PS1"); 951 if(PS1==0) 952 PS1 = "\\w \\$ "; 953 #endif 954 } 955 956 static inline void setup_prompt_string(int promptmode, char **prompt_str) 957 { 958 debug_printf("setup_prompt_string %d ",promptmode); 959 #ifndef CONFIG_FEATURE_SH_FANCY_PROMPT 960 /* Set up the prompt */ 961 if (promptmode == 1) { 962 free(PS1); 963 PS1=xmalloc(strlen(cwd)+4); 964 sprintf(PS1, "%s %s", cwd, ( geteuid() != 0 ) ? "$ ":"# "); 965 *prompt_str = PS1; 966 } else { 967 *prompt_str = PS2; 968 } 969 #else 970 *prompt_str = (promptmode==1)? PS1 : PS2; 971 #endif 972 debug_printf("result %s\n",*prompt_str); 973 } 974 #endif 975 976 #ifdef __U_BOOT__ 977 static int uboot_cli_readline(struct in_str *i) 978 { 979 char *prompt; 980 char __maybe_unused *ps_prompt = NULL; 981 982 if (i->promptmode == 1) 983 prompt = CONFIG_SYS_PROMPT; 984 else 985 prompt = CONFIG_SYS_PROMPT_HUSH_PS2; 986 987 #ifdef CONFIG_CMDLINE_PS_SUPPORT 988 if (i->promptmode == 1) 989 ps_prompt = env_get("PS1"); 990 else 991 ps_prompt = env_get("PS2"); 992 if (ps_prompt) 993 prompt = ps_prompt; 994 #endif 995 996 return cli_readline(prompt); 997 } 998 #endif 999 1000 static void get_user_input(struct in_str *i) 1001 { 1002 #ifndef __U_BOOT__ 1003 char *prompt_str; 1004 static char the_command[BUFSIZ]; 1005 1006 setup_prompt_string(i->promptmode, &prompt_str); 1007 #ifdef CONFIG_FEATURE_COMMAND_EDITING 1008 /* 1009 ** enable command line editing only while a command line 1010 ** is actually being read; otherwise, we'll end up bequeathing 1011 ** atexit() handlers and other unwanted stuff to our 1012 ** child processes (rob (at) sysgo.de) 1013 */ 1014 cmdedit_read_input(prompt_str, the_command); 1015 #else 1016 fputs(prompt_str, stdout); 1017 fflush(stdout); 1018 the_command[0]=fgetc(i->file); 1019 the_command[1]='\0'; 1020 #endif 1021 fflush(stdout); 1022 i->p = the_command; 1023 #else 1024 int n; 1025 static char the_command[CONFIG_SYS_CBSIZE + 1]; 1026 1027 bootretry_reset_cmd_timeout(); 1028 i->__promptme = 1; 1029 n = uboot_cli_readline(i); 1030 1031 #ifdef CONFIG_BOOT_RETRY_TIME 1032 if (n == -2) { 1033 puts("\nTimeout waiting for command\n"); 1034 # ifdef CONFIG_RESET_TO_RETRY 1035 do_reset(NULL, 0, 0, NULL); 1036 # else 1037 # error "This currently only works with CONFIG_RESET_TO_RETRY enabled" 1038 # endif 1039 } 1040 #endif 1041 if (n == -1 ) { 1042 flag_repeat = 0; 1043 i->__promptme = 0; 1044 } 1045 n = strlen(console_buffer); 1046 console_buffer[n] = '\n'; 1047 console_buffer[n+1]= '\0'; 1048 if (had_ctrlc()) flag_repeat = 0; 1049 clear_ctrlc(); 1050 do_repeat = 0; 1051 if (i->promptmode == 1) { 1052 if (console_buffer[0] == '\n'&& flag_repeat == 0) { 1053 strcpy(the_command,console_buffer); 1054 } 1055 else { 1056 if (console_buffer[0] != '\n') { 1057 strcpy(the_command,console_buffer); 1058 flag_repeat = 1; 1059 } 1060 else { 1061 do_repeat = 1; 1062 } 1063 } 1064 i->p = the_command; 1065 } 1066 else { 1067 if (console_buffer[0] != '\n') { 1068 if (strlen(the_command) + strlen(console_buffer) 1069 < CONFIG_SYS_CBSIZE) { 1070 n = strlen(the_command); 1071 the_command[n-1] = ' '; 1072 strcpy(&the_command[n],console_buffer); 1073 } 1074 else { 1075 the_command[0] = '\n'; 1076 the_command[1] = '\0'; 1077 flag_repeat = 0; 1078 } 1079 } 1080 if (i->__promptme == 0) { 1081 the_command[0] = '\n'; 1082 the_command[1] = '\0'; 1083 } 1084 i->p = console_buffer; 1085 } 1086 #endif 1087 } 1088 1089 /* This is the magic location that prints prompts 1090 * and gets data back from the user */ 1091 static int file_get(struct in_str *i) 1092 { 1093 int ch; 1094 1095 ch = 0; 1096 /* If there is data waiting, eat it up */ 1097 if (i->p && *i->p) { 1098 ch = *i->p++; 1099 } else { 1100 /* need to double check i->file because we might be doing something 1101 * more complicated by now, like sourcing or substituting. */ 1102 #ifndef __U_BOOT__ 1103 if (i->__promptme && interactive && i->file == stdin) { 1104 while(! i->p || (interactive && strlen(i->p)==0) ) { 1105 #else 1106 while(! i->p || strlen(i->p)==0 ) { 1107 #endif 1108 get_user_input(i); 1109 } 1110 i->promptmode=2; 1111 #ifndef __U_BOOT__ 1112 i->__promptme = 0; 1113 #endif 1114 if (i->p && *i->p) { 1115 ch = *i->p++; 1116 } 1117 #ifndef __U_BOOT__ 1118 } else { 1119 ch = fgetc(i->file); 1120 } 1121 1122 #endif 1123 debug_printf("b_getch: got a %d\n", ch); 1124 } 1125 #ifndef __U_BOOT__ 1126 if (ch == '\n') i->__promptme=1; 1127 #endif 1128 return ch; 1129 } 1130 1131 /* All the callers guarantee this routine will never be 1132 * used right after a newline, so prompting is not needed. 1133 */ 1134 static int file_peek(struct in_str *i) 1135 { 1136 #ifndef __U_BOOT__ 1137 if (i->p && *i->p) { 1138 #endif 1139 return *i->p; 1140 #ifndef __U_BOOT__ 1141 } else { 1142 i->peek_buf[0] = fgetc(i->file); 1143 i->peek_buf[1] = '\0'; 1144 i->p = i->peek_buf; 1145 debug_printf("b_peek: got a %d\n", *i->p); 1146 return *i->p; 1147 } 1148 #endif 1149 } 1150 1151 #ifndef __U_BOOT__ 1152 static void setup_file_in_str(struct in_str *i, FILE *f) 1153 #else 1154 static void setup_file_in_str(struct in_str *i) 1155 #endif 1156 { 1157 i->peek = file_peek; 1158 i->get = file_get; 1159 i->__promptme=1; 1160 i->promptmode=1; 1161 #ifndef __U_BOOT__ 1162 i->file = f; 1163 #endif 1164 i->p = NULL; 1165 } 1166 1167 static void setup_string_in_str(struct in_str *i, const char *s) 1168 { 1169 i->peek = static_peek; 1170 i->get = static_get; 1171 i->__promptme=1; 1172 i->promptmode=1; 1173 i->p = s; 1174 } 1175 1176 #ifndef __U_BOOT__ 1177 static void mark_open(int fd) 1178 { 1179 struct close_me *new = xmalloc(sizeof(struct close_me)); 1180 new->fd = fd; 1181 new->next = close_me_head; 1182 close_me_head = new; 1183 } 1184 1185 static void mark_closed(int fd) 1186 { 1187 struct close_me *tmp; 1188 if (close_me_head == NULL || close_me_head->fd != fd) 1189 error_msg_and_die("corrupt close_me"); 1190 tmp = close_me_head; 1191 close_me_head = close_me_head->next; 1192 free(tmp); 1193 } 1194 1195 static void close_all(void) 1196 { 1197 struct close_me *c; 1198 for (c=close_me_head; c; c=c->next) { 1199 close(c->fd); 1200 } 1201 close_me_head = NULL; 1202 } 1203 1204 /* squirrel != NULL means we squirrel away copies of stdin, stdout, 1205 * and stderr if they are redirected. */ 1206 static int setup_redirects(struct child_prog *prog, int squirrel[]) 1207 { 1208 int openfd, mode; 1209 struct redir_struct *redir; 1210 1211 for (redir=prog->redirects; redir; redir=redir->next) { 1212 if (redir->dup == -1 && redir->word.gl_pathv == NULL) { 1213 /* something went wrong in the parse. Pretend it didn't happen */ 1214 continue; 1215 } 1216 if (redir->dup == -1) { 1217 mode=redir_table[redir->type].mode; 1218 openfd = open(redir->word.gl_pathv[0], mode, 0666); 1219 if (openfd < 0) { 1220 /* this could get lost if stderr has been redirected, but 1221 bash and ash both lose it as well (though zsh doesn't!) */ 1222 perror_msg("error opening %s", redir->word.gl_pathv[0]); 1223 return 1; 1224 } 1225 } else { 1226 openfd = redir->dup; 1227 } 1228 1229 if (openfd != redir->fd) { 1230 if (squirrel && redir->fd < 3) { 1231 squirrel[redir->fd] = dup(redir->fd); 1232 } 1233 if (openfd == -3) { 1234 close(openfd); 1235 } else { 1236 dup2(openfd, redir->fd); 1237 if (redir->dup == -1) 1238 close (openfd); 1239 } 1240 } 1241 } 1242 return 0; 1243 } 1244 1245 static void restore_redirects(int squirrel[]) 1246 { 1247 int i, fd; 1248 for (i=0; i<3; i++) { 1249 fd = squirrel[i]; 1250 if (fd != -1) { 1251 /* No error checking. I sure wouldn't know what 1252 * to do with an error if I found one! */ 1253 dup2(fd, i); 1254 close(fd); 1255 } 1256 } 1257 } 1258 1259 /* never returns */ 1260 /* XXX no exit() here. If you don't exec, use _exit instead. 1261 * The at_exit handlers apparently confuse the calling process, 1262 * in particular stdin handling. Not sure why? */ 1263 static void pseudo_exec(struct child_prog *child) 1264 { 1265 int i, rcode; 1266 char *p; 1267 struct built_in_command *x; 1268 if (child->argv) { 1269 for (i=0; is_assignment(child->argv[i]); i++) { 1270 debug_printf("pid %d environment modification: %s\n",getpid(),child->argv[i]); 1271 p = insert_var_value(child->argv[i]); 1272 putenv(strdup(p)); 1273 if (p != child->argv[i]) free(p); 1274 } 1275 child->argv+=i; /* XXX this hack isn't so horrible, since we are about 1276 to exit, and therefore don't need to keep data 1277 structures consistent for free() use. */ 1278 /* If a variable is assigned in a forest, and nobody listens, 1279 * was it ever really set? 1280 */ 1281 if (child->argv[0] == NULL) { 1282 _exit(EXIT_SUCCESS); 1283 } 1284 1285 /* 1286 * Check if the command matches any of the builtins. 1287 * Depending on context, this might be redundant. But it's 1288 * easier to waste a few CPU cycles than it is to figure out 1289 * if this is one of those cases. 1290 */ 1291 for (x = bltins; x->cmd; x++) { 1292 if (strcmp(child->argv[0], x->cmd) == 0 ) { 1293 debug_printf("builtin exec %s\n", child->argv[0]); 1294 rcode = x->function(child); 1295 fflush(stdout); 1296 _exit(rcode); 1297 } 1298 } 1299 1300 /* Check if the command matches any busybox internal commands 1301 * ("applets") here. 1302 * FIXME: This feature is not 100% safe, since 1303 * BusyBox is not fully reentrant, so we have no guarantee the things 1304 * from the .bss are still zeroed, or that things from .data are still 1305 * at their defaults. We could exec ourself from /proc/self/exe, but I 1306 * really dislike relying on /proc for things. We could exec ourself 1307 * from global_argv[0], but if we are in a chroot, we may not be able 1308 * to find ourself... */ 1309 #ifdef CONFIG_FEATURE_SH_STANDALONE_SHELL 1310 { 1311 int argc_l; 1312 char** argv_l=child->argv; 1313 char *name = child->argv[0]; 1314 1315 #ifdef CONFIG_FEATURE_SH_APPLETS_ALWAYS_WIN 1316 /* Following discussions from November 2000 on the busybox mailing 1317 * list, the default configuration, (without 1318 * get_last_path_component()) lets the user force use of an 1319 * external command by specifying the full (with slashes) filename. 1320 * If you enable CONFIG_FEATURE_SH_APPLETS_ALWAYS_WIN then applets 1321 * _aways_ override external commands, so if you want to run 1322 * /bin/cat, it will use BusyBox cat even if /bin/cat exists on the 1323 * filesystem and is _not_ busybox. Some systems may want this, 1324 * most do not. */ 1325 name = get_last_path_component(name); 1326 #endif 1327 /* Count argc for use in a second... */ 1328 for(argc_l=0;*argv_l!=NULL; argv_l++, argc_l++); 1329 optind = 1; 1330 debug_printf("running applet %s\n", name); 1331 run_applet_by_name(name, argc_l, child->argv); 1332 } 1333 #endif 1334 debug_printf("exec of %s\n",child->argv[0]); 1335 execvp(child->argv[0],child->argv); 1336 perror_msg("couldn't exec: %s",child->argv[0]); 1337 _exit(1); 1338 } else if (child->group) { 1339 debug_printf("runtime nesting to group\n"); 1340 interactive=0; /* crucial!!!! */ 1341 rcode = run_list_real(child->group); 1342 /* OK to leak memory by not calling free_pipe_list, 1343 * since this process is about to exit */ 1344 _exit(rcode); 1345 } else { 1346 /* Can happen. See what bash does with ">foo" by itself. */ 1347 debug_printf("trying to pseudo_exec null command\n"); 1348 _exit(EXIT_SUCCESS); 1349 } 1350 } 1351 1352 static void insert_bg_job(struct pipe *pi) 1353 { 1354 struct pipe *thejob; 1355 1356 /* Linear search for the ID of the job to use */ 1357 pi->jobid = 1; 1358 for (thejob = job_list; thejob; thejob = thejob->next) 1359 if (thejob->jobid >= pi->jobid) 1360 pi->jobid = thejob->jobid + 1; 1361 1362 /* add thejob to the list of running jobs */ 1363 if (!job_list) { 1364 thejob = job_list = xmalloc(sizeof(*thejob)); 1365 } else { 1366 for (thejob = job_list; thejob->next; thejob = thejob->next) /* nothing */; 1367 thejob->next = xmalloc(sizeof(*thejob)); 1368 thejob = thejob->next; 1369 } 1370 1371 /* physically copy the struct job */ 1372 memcpy(thejob, pi, sizeof(struct pipe)); 1373 thejob->next = NULL; 1374 thejob->running_progs = thejob->num_progs; 1375 thejob->stopped_progs = 0; 1376 thejob->text = xmalloc(BUFSIZ); /* cmdedit buffer size */ 1377 1378 /*if (pi->progs[0] && pi->progs[0].argv && pi->progs[0].argv[0]) */ 1379 { 1380 char *bar=thejob->text; 1381 char **foo=pi->progs[0].argv; 1382 while(foo && *foo) { 1383 bar += sprintf(bar, "%s ", *foo++); 1384 } 1385 } 1386 1387 /* we don't wait for background thejobs to return -- append it 1388 to the list of backgrounded thejobs and leave it alone */ 1389 printf("[%d] %d\n", thejob->jobid, thejob->progs[0].pid); 1390 last_bg_pid = thejob->progs[0].pid; 1391 last_jobid = thejob->jobid; 1392 } 1393 1394 /* remove a backgrounded job */ 1395 static void remove_bg_job(struct pipe *pi) 1396 { 1397 struct pipe *prev_pipe; 1398 1399 if (pi == job_list) { 1400 job_list = pi->next; 1401 } else { 1402 prev_pipe = job_list; 1403 while (prev_pipe->next != pi) 1404 prev_pipe = prev_pipe->next; 1405 prev_pipe->next = pi->next; 1406 } 1407 if (job_list) 1408 last_jobid = job_list->jobid; 1409 else 1410 last_jobid = 0; 1411 1412 pi->stopped_progs = 0; 1413 free_pipe(pi, 0); 1414 free(pi); 1415 } 1416 1417 /* Checks to see if any processes have exited -- if they 1418 have, figure out why and see if a job has completed */ 1419 static int checkjobs(struct pipe* fg_pipe) 1420 { 1421 int attributes; 1422 int status; 1423 int prognum = 0; 1424 struct pipe *pi; 1425 pid_t childpid; 1426 1427 attributes = WUNTRACED; 1428 if (fg_pipe==NULL) { 1429 attributes |= WNOHANG; 1430 } 1431 1432 while ((childpid = waitpid(-1, &status, attributes)) > 0) { 1433 if (fg_pipe) { 1434 int i, rcode = 0; 1435 for (i=0; i < fg_pipe->num_progs; i++) { 1436 if (fg_pipe->progs[i].pid == childpid) { 1437 if (i==fg_pipe->num_progs-1) 1438 rcode=WEXITSTATUS(status); 1439 (fg_pipe->num_progs)--; 1440 return(rcode); 1441 } 1442 } 1443 } 1444 1445 for (pi = job_list; pi; pi = pi->next) { 1446 prognum = 0; 1447 while (prognum < pi->num_progs && pi->progs[prognum].pid != childpid) { 1448 prognum++; 1449 } 1450 if (prognum < pi->num_progs) 1451 break; 1452 } 1453 1454 if(pi==NULL) { 1455 debug_printf("checkjobs: pid %d was not in our list!\n", childpid); 1456 continue; 1457 } 1458 1459 if (WIFEXITED(status) || WIFSIGNALED(status)) { 1460 /* child exited */ 1461 pi->running_progs--; 1462 pi->progs[prognum].pid = 0; 1463 1464 if (!pi->running_progs) { 1465 printf(JOB_STATUS_FORMAT, pi->jobid, "Done", pi->text); 1466 remove_bg_job(pi); 1467 } 1468 } else { 1469 /* child stopped */ 1470 pi->stopped_progs++; 1471 pi->progs[prognum].is_stopped = 1; 1472 1473 #if 0 1474 /* Printing this stuff is a pain, since it tends to 1475 * overwrite the prompt an inconveinient moments. So 1476 * don't do that. */ 1477 if (pi->stopped_progs == pi->num_progs) { 1478 printf("\n"JOB_STATUS_FORMAT, pi->jobid, "Stopped", pi->text); 1479 } 1480 #endif 1481 } 1482 } 1483 1484 if (childpid == -1 && errno != ECHILD) 1485 perror_msg("waitpid"); 1486 1487 /* move the shell to the foreground */ 1488 /*if (interactive && tcsetpgrp(shell_terminal, getpgid(0))) */ 1489 /* perror_msg("tcsetpgrp-2"); */ 1490 return -1; 1491 } 1492 1493 /* Figure out our controlling tty, checking in order stderr, 1494 * stdin, and stdout. If check_pgrp is set, also check that 1495 * we belong to the foreground process group associated with 1496 * that tty. The value of shell_terminal is needed in order to call 1497 * tcsetpgrp(shell_terminal, ...); */ 1498 void controlling_tty(int check_pgrp) 1499 { 1500 pid_t curpgrp; 1501 1502 if ((curpgrp = tcgetpgrp(shell_terminal = 2)) < 0 1503 && (curpgrp = tcgetpgrp(shell_terminal = 0)) < 0 1504 && (curpgrp = tcgetpgrp(shell_terminal = 1)) < 0) 1505 goto shell_terminal_error; 1506 1507 if (check_pgrp && curpgrp != getpgid(0)) 1508 goto shell_terminal_error; 1509 1510 return; 1511 1512 shell_terminal_error: 1513 shell_terminal = -1; 1514 return; 1515 } 1516 #endif 1517 1518 /* run_pipe_real() starts all the jobs, but doesn't wait for anything 1519 * to finish. See checkjobs(). 1520 * 1521 * return code is normally -1, when the caller has to wait for children 1522 * to finish to determine the exit status of the pipe. If the pipe 1523 * is a simple builtin command, however, the action is done by the 1524 * time run_pipe_real returns, and the exit code is provided as the 1525 * return value. 1526 * 1527 * The input of the pipe is always stdin, the output is always 1528 * stdout. The outpipe[] mechanism in BusyBox-0.48 lash is bogus, 1529 * because it tries to avoid running the command substitution in 1530 * subshell, when that is in fact necessary. The subshell process 1531 * now has its stdout directed to the input of the appropriate pipe, 1532 * so this routine is noticeably simpler. 1533 */ 1534 static int run_pipe_real(struct pipe *pi) 1535 { 1536 int i; 1537 #ifndef __U_BOOT__ 1538 int nextin, nextout; 1539 int pipefds[2]; /* pipefds[0] is for reading */ 1540 struct child_prog *child; 1541 struct built_in_command *x; 1542 char *p; 1543 # if __GNUC__ 1544 /* Avoid longjmp clobbering */ 1545 (void) &i; 1546 (void) &nextin; 1547 (void) &nextout; 1548 (void) &child; 1549 # endif 1550 #else 1551 int nextin; 1552 int flag = do_repeat ? CMD_FLAG_REPEAT : 0; 1553 struct child_prog *child; 1554 char *p; 1555 # if __GNUC__ 1556 /* Avoid longjmp clobbering */ 1557 (void) &i; 1558 (void) &nextin; 1559 (void) &child; 1560 # endif 1561 #endif /* __U_BOOT__ */ 1562 1563 nextin = 0; 1564 #ifndef __U_BOOT__ 1565 pi->pgrp = -1; 1566 #endif 1567 1568 /* Check if this is a simple builtin (not part of a pipe). 1569 * Builtins within pipes have to fork anyway, and are handled in 1570 * pseudo_exec. "echo foo | read bar" doesn't work on bash, either. 1571 */ 1572 if (pi->num_progs == 1) child = & (pi->progs[0]); 1573 #ifndef __U_BOOT__ 1574 if (pi->num_progs == 1 && child->group && child->subshell == 0) { 1575 int squirrel[] = {-1, -1, -1}; 1576 int rcode; 1577 debug_printf("non-subshell grouping\n"); 1578 setup_redirects(child, squirrel); 1579 /* XXX could we merge code with following builtin case, 1580 * by creating a pseudo builtin that calls run_list_real? */ 1581 rcode = run_list_real(child->group); 1582 restore_redirects(squirrel); 1583 #else 1584 if (pi->num_progs == 1 && child->group) { 1585 int rcode; 1586 debug_printf("non-subshell grouping\n"); 1587 rcode = run_list_real(child->group); 1588 #endif 1589 return rcode; 1590 } else if (pi->num_progs == 1 && pi->progs[0].argv != NULL) { 1591 for (i=0; is_assignment(child->argv[i]); i++) { /* nothing */ } 1592 if (i!=0 && child->argv[i]==NULL) { 1593 /* assignments, but no command: set the local environment */ 1594 for (i=0; child->argv[i]!=NULL; i++) { 1595 1596 /* Ok, this case is tricky. We have to decide if this is a 1597 * local variable, or an already exported variable. If it is 1598 * already exported, we have to export the new value. If it is 1599 * not exported, we need only set this as a local variable. 1600 * This junk is all to decide whether or not to export this 1601 * variable. */ 1602 int export_me=0; 1603 char *name, *value; 1604 name = xstrdup(child->argv[i]); 1605 debug_printf("Local environment set: %s\n", name); 1606 value = strchr(name, '='); 1607 if (value) 1608 *value=0; 1609 #ifndef __U_BOOT__ 1610 if ( get_local_var(name)) { 1611 export_me=1; 1612 } 1613 #endif 1614 free(name); 1615 p = insert_var_value(child->argv[i]); 1616 set_local_var(p, export_me); 1617 if (p != child->argv[i]) free(p); 1618 } 1619 return EXIT_SUCCESS; /* don't worry about errors in set_local_var() yet */ 1620 } 1621 for (i = 0; is_assignment(child->argv[i]); i++) { 1622 p = insert_var_value(child->argv[i]); 1623 #ifndef __U_BOOT__ 1624 putenv(strdup(p)); 1625 #else 1626 set_local_var(p, 0); 1627 #endif 1628 if (p != child->argv[i]) { 1629 child->sp--; 1630 free(p); 1631 } 1632 } 1633 if (child->sp) { 1634 char * str = NULL; 1635 1636 str = make_string(child->argv + i, 1637 child->argv_nonnull + i); 1638 parse_string_outer(str, FLAG_EXIT_FROM_LOOP | FLAG_REPARSING); 1639 free(str); 1640 return last_return_code; 1641 } 1642 #ifndef __U_BOOT__ 1643 for (x = bltins; x->cmd; x++) { 1644 if (strcmp(child->argv[i], x->cmd) == 0 ) { 1645 int squirrel[] = {-1, -1, -1}; 1646 int rcode; 1647 if (x->function == builtin_exec && child->argv[i+1]==NULL) { 1648 debug_printf("magic exec\n"); 1649 setup_redirects(child,NULL); 1650 return EXIT_SUCCESS; 1651 } 1652 debug_printf("builtin inline %s\n", child->argv[0]); 1653 /* XXX setup_redirects acts on file descriptors, not FILEs. 1654 * This is perfect for work that comes after exec(). 1655 * Is it really safe for inline use? Experimentally, 1656 * things seem to work with glibc. */ 1657 setup_redirects(child, squirrel); 1658 1659 child->argv += i; /* XXX horrible hack */ 1660 rcode = x->function(child); 1661 /* XXX restore hack so free() can work right */ 1662 child->argv -= i; 1663 restore_redirects(squirrel); 1664 } 1665 return rcode; 1666 } 1667 #else 1668 /* check ";", because ,example , argv consist from 1669 * "help;flinfo" must not execute 1670 */ 1671 if (strchr(child->argv[i], ';')) { 1672 printf("Unknown command '%s' - try 'help' or use " 1673 "'run' command\n", child->argv[i]); 1674 return -1; 1675 } 1676 /* Process the command */ 1677 return cmd_process(flag, child->argc, child->argv, 1678 &flag_repeat, NULL); 1679 #endif 1680 } 1681 #ifndef __U_BOOT__ 1682 1683 for (i = 0; i < pi->num_progs; i++) { 1684 child = & (pi->progs[i]); 1685 1686 /* pipes are inserted between pairs of commands */ 1687 if ((i + 1) < pi->num_progs) { 1688 if (pipe(pipefds)<0) perror_msg_and_die("pipe"); 1689 nextout = pipefds[1]; 1690 } else { 1691 nextout=1; 1692 pipefds[0] = -1; 1693 } 1694 1695 /* XXX test for failed fork()? */ 1696 if (!(child->pid = fork())) { 1697 /* Set the handling for job control signals back to the default. */ 1698 signal(SIGINT, SIG_DFL); 1699 signal(SIGQUIT, SIG_DFL); 1700 signal(SIGTERM, SIG_DFL); 1701 signal(SIGTSTP, SIG_DFL); 1702 signal(SIGTTIN, SIG_DFL); 1703 signal(SIGTTOU, SIG_DFL); 1704 signal(SIGCHLD, SIG_DFL); 1705 1706 close_all(); 1707 1708 if (nextin != 0) { 1709 dup2(nextin, 0); 1710 close(nextin); 1711 } 1712 if (nextout != 1) { 1713 dup2(nextout, 1); 1714 close(nextout); 1715 } 1716 if (pipefds[0]!=-1) { 1717 close(pipefds[0]); /* opposite end of our output pipe */ 1718 } 1719 1720 /* Like bash, explicit redirects override pipes, 1721 * and the pipe fd is available for dup'ing. */ 1722 setup_redirects(child,NULL); 1723 1724 if (interactive && pi->followup!=PIPE_BG) { 1725 /* If we (the child) win the race, put ourselves in the process 1726 * group whose leader is the first process in this pipe. */ 1727 if (pi->pgrp < 0) { 1728 pi->pgrp = getpid(); 1729 } 1730 if (setpgid(0, pi->pgrp) == 0) { 1731 tcsetpgrp(2, pi->pgrp); 1732 } 1733 } 1734 1735 pseudo_exec(child); 1736 } 1737 1738 1739 /* put our child in the process group whose leader is the 1740 first process in this pipe */ 1741 if (pi->pgrp < 0) { 1742 pi->pgrp = child->pid; 1743 } 1744 /* Don't check for errors. The child may be dead already, 1745 * in which case setpgid returns error code EACCES. */ 1746 setpgid(child->pid, pi->pgrp); 1747 1748 if (nextin != 0) 1749 close(nextin); 1750 if (nextout != 1) 1751 close(nextout); 1752 1753 /* If there isn't another process, nextin is garbage 1754 but it doesn't matter */ 1755 nextin = pipefds[0]; 1756 } 1757 #endif 1758 return -1; 1759 } 1760 1761 static int run_list_real(struct pipe *pi) 1762 { 1763 char *save_name = NULL; 1764 char **list = NULL; 1765 char **save_list = NULL; 1766 struct pipe *rpipe; 1767 int flag_rep = 0; 1768 #ifndef __U_BOOT__ 1769 int save_num_progs; 1770 #endif 1771 int rcode=0, flag_skip=1; 1772 int flag_restore = 0; 1773 int if_code=0, next_if_code=0; /* need double-buffer to handle elif */ 1774 reserved_style rmode, skip_more_in_this_rmode=RES_XXXX; 1775 /* check syntax for "for" */ 1776 for (rpipe = pi; rpipe; rpipe = rpipe->next) { 1777 if ((rpipe->r_mode == RES_IN || 1778 rpipe->r_mode == RES_FOR) && 1779 (rpipe->next == NULL)) { 1780 syntax(); 1781 #ifdef __U_BOOT__ 1782 flag_repeat = 0; 1783 #endif 1784 return 1; 1785 } 1786 if ((rpipe->r_mode == RES_IN && 1787 (rpipe->next->r_mode == RES_IN && 1788 rpipe->next->progs->argv != NULL))|| 1789 (rpipe->r_mode == RES_FOR && 1790 rpipe->next->r_mode != RES_IN)) { 1791 syntax(); 1792 #ifdef __U_BOOT__ 1793 flag_repeat = 0; 1794 #endif 1795 return 1; 1796 } 1797 } 1798 for (; pi; pi = (flag_restore != 0) ? rpipe : pi->next) { 1799 if (pi->r_mode == RES_WHILE || pi->r_mode == RES_UNTIL || 1800 pi->r_mode == RES_FOR) { 1801 #ifdef __U_BOOT__ 1802 /* check Ctrl-C */ 1803 ctrlc(); 1804 if ((had_ctrlc())) { 1805 return 1; 1806 } 1807 #endif 1808 flag_restore = 0; 1809 if (!rpipe) { 1810 flag_rep = 0; 1811 rpipe = pi; 1812 } 1813 } 1814 rmode = pi->r_mode; 1815 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); 1816 if (rmode == skip_more_in_this_rmode && flag_skip) { 1817 if (pi->followup == PIPE_SEQ) flag_skip=0; 1818 continue; 1819 } 1820 flag_skip = 1; 1821 skip_more_in_this_rmode = RES_XXXX; 1822 if (rmode == RES_THEN || rmode == RES_ELSE) if_code = next_if_code; 1823 if (rmode == RES_THEN && if_code) continue; 1824 if (rmode == RES_ELSE && !if_code) continue; 1825 if (rmode == RES_ELIF && !if_code) break; 1826 if (rmode == RES_FOR && pi->num_progs) { 1827 if (!list) { 1828 /* if no variable values after "in" we skip "for" */ 1829 if (!pi->next->progs->argv) continue; 1830 /* create list of variable values */ 1831 list = make_list_in(pi->next->progs->argv, 1832 pi->progs->argv[0]); 1833 save_list = list; 1834 save_name = pi->progs->argv[0]; 1835 pi->progs->argv[0] = NULL; 1836 flag_rep = 1; 1837 } 1838 if (!(*list)) { 1839 free(pi->progs->argv[0]); 1840 free(save_list); 1841 list = NULL; 1842 flag_rep = 0; 1843 pi->progs->argv[0] = save_name; 1844 #ifndef __U_BOOT__ 1845 pi->progs->glob_result.gl_pathv[0] = 1846 pi->progs->argv[0]; 1847 #endif 1848 continue; 1849 } else { 1850 /* insert new value from list for variable */ 1851 if (pi->progs->argv[0]) 1852 free(pi->progs->argv[0]); 1853 pi->progs->argv[0] = *list++; 1854 #ifndef __U_BOOT__ 1855 pi->progs->glob_result.gl_pathv[0] = 1856 pi->progs->argv[0]; 1857 #endif 1858 } 1859 } 1860 if (rmode == RES_IN) continue; 1861 if (rmode == RES_DO) { 1862 if (!flag_rep) continue; 1863 } 1864 if (rmode == RES_DONE) { 1865 if (flag_rep) { 1866 flag_restore = 1; 1867 } else { 1868 rpipe = NULL; 1869 } 1870 } 1871 if (pi->num_progs == 0) continue; 1872 #ifndef __U_BOOT__ 1873 save_num_progs = pi->num_progs; /* save number of programs */ 1874 #endif 1875 rcode = run_pipe_real(pi); 1876 debug_printf("run_pipe_real returned %d\n",rcode); 1877 #ifndef __U_BOOT__ 1878 if (rcode!=-1) { 1879 /* We only ran a builtin: rcode was set by the return value 1880 * of run_pipe_real(), and we don't need to wait for anything. */ 1881 } else if (pi->followup==PIPE_BG) { 1882 /* XXX check bash's behavior with nontrivial pipes */ 1883 /* XXX compute jobid */ 1884 /* XXX what does bash do with attempts to background builtins? */ 1885 insert_bg_job(pi); 1886 rcode = EXIT_SUCCESS; 1887 } else { 1888 if (interactive) { 1889 /* move the new process group into the foreground */ 1890 if (tcsetpgrp(shell_terminal, pi->pgrp) && errno != ENOTTY) 1891 perror_msg("tcsetpgrp-3"); 1892 rcode = checkjobs(pi); 1893 /* move the shell to the foreground */ 1894 if (tcsetpgrp(shell_terminal, getpgid(0)) && errno != ENOTTY) 1895 perror_msg("tcsetpgrp-4"); 1896 } else { 1897 rcode = checkjobs(pi); 1898 } 1899 debug_printf("checkjobs returned %d\n",rcode); 1900 } 1901 last_return_code=rcode; 1902 #else 1903 if (rcode < -1) { 1904 last_return_code = -rcode - 2; 1905 return -2; /* exit */ 1906 } 1907 last_return_code=(rcode == 0) ? 0 : 1; 1908 #endif 1909 #ifndef __U_BOOT__ 1910 pi->num_progs = save_num_progs; /* restore number of programs */ 1911 #endif 1912 if ( rmode == RES_IF || rmode == RES_ELIF ) 1913 next_if_code=rcode; /* can be overwritten a number of times */ 1914 if (rmode == RES_WHILE) 1915 flag_rep = !last_return_code; 1916 if (rmode == RES_UNTIL) 1917 flag_rep = last_return_code; 1918 if ( (rcode==EXIT_SUCCESS && pi->followup==PIPE_OR) || 1919 (rcode!=EXIT_SUCCESS && pi->followup==PIPE_AND) ) 1920 skip_more_in_this_rmode=rmode; 1921 #ifndef __U_BOOT__ 1922 checkjobs(NULL); 1923 #endif 1924 } 1925 return rcode; 1926 } 1927 1928 /* broken, of course, but OK for testing */ 1929 static char *indenter(int i) 1930 { 1931 static char blanks[]=" "; 1932 return &blanks[sizeof(blanks)-i-1]; 1933 } 1934 1935 /* return code is the exit status of the pipe */ 1936 static int free_pipe(struct pipe *pi, int indent) 1937 { 1938 char **p; 1939 struct child_prog *child; 1940 #ifndef __U_BOOT__ 1941 struct redir_struct *r, *rnext; 1942 #endif 1943 int a, i, ret_code=0; 1944 char *ind = indenter(indent); 1945 1946 #ifndef __U_BOOT__ 1947 if (pi->stopped_progs > 0) 1948 return ret_code; 1949 final_printf("%s run pipe: (pid %d)\n",ind,getpid()); 1950 #endif 1951 for (i=0; i<pi->num_progs; i++) { 1952 child = &pi->progs[i]; 1953 final_printf("%s command %d:\n",ind,i); 1954 if (child->argv) { 1955 for (a=0,p=child->argv; *p; a++,p++) { 1956 final_printf("%s argv[%d] = %s\n",ind,a,*p); 1957 } 1958 #ifndef __U_BOOT__ 1959 globfree(&child->glob_result); 1960 #else 1961 for (a = 0; a < child->argc; a++) { 1962 free(child->argv[a]); 1963 } 1964 free(child->argv); 1965 free(child->argv_nonnull); 1966 child->argc = 0; 1967 #endif 1968 child->argv=NULL; 1969 } else if (child->group) { 1970 #ifndef __U_BOOT__ 1971 final_printf("%s begin group (subshell:%d)\n",ind, child->subshell); 1972 #endif 1973 ret_code = free_pipe_list(child->group,indent+3); 1974 final_printf("%s end group\n",ind); 1975 } else { 1976 final_printf("%s (nil)\n",ind); 1977 } 1978 #ifndef __U_BOOT__ 1979 for (r=child->redirects; r; r=rnext) { 1980 final_printf("%s redirect %d%s", ind, r->fd, redir_table[r->type].descrip); 1981 if (r->dup == -1) { 1982 /* guard against the case >$FOO, where foo is unset or blank */ 1983 if (r->word.gl_pathv) { 1984 final_printf(" %s\n", *r->word.gl_pathv); 1985 globfree(&r->word); 1986 } 1987 } else { 1988 final_printf("&%d\n", r->dup); 1989 } 1990 rnext=r->next; 1991 free(r); 1992 } 1993 child->redirects=NULL; 1994 #endif 1995 } 1996 free(pi->progs); /* children are an array, they get freed all at once */ 1997 pi->progs=NULL; 1998 return ret_code; 1999 } 2000 2001 static int free_pipe_list(struct pipe *head, int indent) 2002 { 2003 int rcode=0; /* if list has no members */ 2004 struct pipe *pi, *next; 2005 char *ind = indenter(indent); 2006 for (pi=head; pi; pi=next) { 2007 final_printf("%s pipe reserved mode %d\n", ind, pi->r_mode); 2008 rcode = free_pipe(pi, indent); 2009 final_printf("%s pipe followup code %d\n", ind, pi->followup); 2010 next=pi->next; 2011 pi->next=NULL; 2012 free(pi); 2013 } 2014 return rcode; 2015 } 2016 2017 /* Select which version we will use */ 2018 static int run_list(struct pipe *pi) 2019 { 2020 int rcode=0; 2021 #ifndef __U_BOOT__ 2022 if (fake_mode==0) { 2023 #endif 2024 rcode = run_list_real(pi); 2025 #ifndef __U_BOOT__ 2026 } 2027 #endif 2028 /* free_pipe_list has the side effect of clearing memory 2029 * In the long run that function can be merged with run_list_real, 2030 * but doing that now would hobble the debugging effort. */ 2031 free_pipe_list(pi,0); 2032 return rcode; 2033 } 2034 2035 /* The API for glob is arguably broken. This routine pushes a non-matching 2036 * string into the output structure, removing non-backslashed backslashes. 2037 * If someone can prove me wrong, by performing this function within the 2038 * original glob(3) api, feel free to rewrite this routine into oblivion. 2039 * Return code (0 vs. GLOB_NOSPACE) matches glob(3). 2040 * XXX broken if the last character is '\\', check that before calling. 2041 */ 2042 #ifndef __U_BOOT__ 2043 static int globhack(const char *src, int flags, glob_t *pglob) 2044 { 2045 int cnt=0, pathc; 2046 const char *s; 2047 char *dest; 2048 for (cnt=1, s=src; s && *s; s++) { 2049 if (*s == '\\') s++; 2050 cnt++; 2051 } 2052 dest = malloc(cnt); 2053 if (!dest) return GLOB_NOSPACE; 2054 if (!(flags & GLOB_APPEND)) { 2055 pglob->gl_pathv=NULL; 2056 pglob->gl_pathc=0; 2057 pglob->gl_offs=0; 2058 pglob->gl_offs=0; 2059 } 2060 pathc = ++pglob->gl_pathc; 2061 pglob->gl_pathv = realloc(pglob->gl_pathv, (pathc+1)*sizeof(*pglob->gl_pathv)); 2062 if (pglob->gl_pathv == NULL) return GLOB_NOSPACE; 2063 pglob->gl_pathv[pathc-1]=dest; 2064 pglob->gl_pathv[pathc]=NULL; 2065 for (s=src; s && *s; s++, dest++) { 2066 if (*s == '\\') s++; 2067 *dest = *s; 2068 } 2069 *dest='\0'; 2070 return 0; 2071 } 2072 2073 /* XXX broken if the last character is '\\', check that before calling */ 2074 static int glob_needed(const char *s) 2075 { 2076 for (; *s; s++) { 2077 if (*s == '\\') s++; 2078 if (strchr("*[?",*s)) return 1; 2079 } 2080 return 0; 2081 } 2082 2083 #if 0 2084 static void globprint(glob_t *pglob) 2085 { 2086 int i; 2087 debug_printf("glob_t at %p:\n", pglob); 2088 debug_printf(" gl_pathc=%d gl_pathv=%p gl_offs=%d gl_flags=%d\n", 2089 pglob->gl_pathc, pglob->gl_pathv, pglob->gl_offs, pglob->gl_flags); 2090 for (i=0; i<pglob->gl_pathc; i++) 2091 debug_printf("pglob->gl_pathv[%d] = %p = %s\n", i, 2092 pglob->gl_pathv[i], pglob->gl_pathv[i]); 2093 } 2094 #endif 2095 2096 static int xglob(o_string *dest, int flags, glob_t *pglob) 2097 { 2098 int gr; 2099 2100 /* short-circuit for null word */ 2101 /* we can code this better when the debug_printf's are gone */ 2102 if (dest->length == 0) { 2103 if (dest->nonnull) { 2104 /* bash man page calls this an "explicit" null */ 2105 gr = globhack(dest->data, flags, pglob); 2106 debug_printf("globhack returned %d\n",gr); 2107 } else { 2108 return 0; 2109 } 2110 } else if (glob_needed(dest->data)) { 2111 gr = glob(dest->data, flags, NULL, pglob); 2112 debug_printf("glob returned %d\n",gr); 2113 if (gr == GLOB_NOMATCH) { 2114 /* quote removal, or more accurately, backslash removal */ 2115 gr = globhack(dest->data, flags, pglob); 2116 debug_printf("globhack returned %d\n",gr); 2117 } 2118 } else { 2119 gr = globhack(dest->data, flags, pglob); 2120 debug_printf("globhack returned %d\n",gr); 2121 } 2122 if (gr == GLOB_NOSPACE) 2123 error_msg_and_die("out of memory during glob"); 2124 if (gr != 0) { /* GLOB_ABORTED ? */ 2125 error_msg("glob(3) error %d",gr); 2126 } 2127 /* globprint(glob_target); */ 2128 return gr; 2129 } 2130 #endif 2131 2132 #ifdef __U_BOOT__ 2133 static char *get_dollar_var(char ch); 2134 #endif 2135 2136 /* This is used to get/check local shell variables */ 2137 char *get_local_var(const char *s) 2138 { 2139 struct variables *cur; 2140 2141 if (!s) 2142 return NULL; 2143 2144 #ifdef __U_BOOT__ 2145 if (*s == '$') 2146 return get_dollar_var(s[1]); 2147 #endif 2148 2149 for (cur = top_vars; cur; cur=cur->next) 2150 if(strcmp(cur->name, s)==0) 2151 return cur->value; 2152 return NULL; 2153 } 2154 2155 /* This is used to set local shell variables 2156 flg_export==0 if only local (not exporting) variable 2157 flg_export==1 if "new" exporting environ 2158 flg_export>1 if current startup environ (not call putenv()) */ 2159 int set_local_var(const char *s, int flg_export) 2160 { 2161 char *name, *value; 2162 int result=0; 2163 struct variables *cur; 2164 2165 #ifdef __U_BOOT__ 2166 /* might be possible! */ 2167 if (!isalpha(*s)) 2168 return -1; 2169 #endif 2170 2171 name=strdup(s); 2172 2173 #ifdef __U_BOOT__ 2174 if (env_get(name) != NULL) { 2175 printf ("ERROR: " 2176 "There is a global environment variable with the same name.\n"); 2177 free(name); 2178 return -1; 2179 } 2180 #endif 2181 /* Assume when we enter this function that we are already in 2182 * NAME=VALUE format. So the first order of business is to 2183 * split 's' on the '=' into 'name' and 'value' */ 2184 value = strchr(name, '='); 2185 if (value == NULL || *(value + 1) == 0) { 2186 free(name); 2187 return -1; 2188 } 2189 *value++ = 0; 2190 2191 for(cur = top_vars; cur; cur = cur->next) { 2192 if(strcmp(cur->name, name)==0) 2193 break; 2194 } 2195 2196 if(cur) { 2197 if(strcmp(cur->value, value)==0) { 2198 if(flg_export>0 && cur->flg_export==0) 2199 cur->flg_export=flg_export; 2200 else 2201 result++; 2202 } else { 2203 if(cur->flg_read_only) { 2204 error_msg("%s: readonly variable", name); 2205 result = -1; 2206 } else { 2207 if(flg_export>0 || cur->flg_export>1) 2208 cur->flg_export=1; 2209 free(cur->value); 2210 2211 cur->value = strdup(value); 2212 } 2213 } 2214 } else { 2215 cur = malloc(sizeof(struct variables)); 2216 if(!cur) { 2217 result = -1; 2218 } else { 2219 cur->name = strdup(name); 2220 if (cur->name == NULL) { 2221 free(cur); 2222 result = -1; 2223 } else { 2224 struct variables *bottom = top_vars; 2225 cur->value = strdup(value); 2226 cur->next = NULL; 2227 cur->flg_export = flg_export; 2228 cur->flg_read_only = 0; 2229 while(bottom->next) bottom=bottom->next; 2230 bottom->next = cur; 2231 } 2232 } 2233 } 2234 2235 #ifndef __U_BOOT__ 2236 if(result==0 && cur->flg_export==1) { 2237 *(value-1) = '='; 2238 result = putenv(name); 2239 } else { 2240 #endif 2241 free(name); 2242 #ifndef __U_BOOT__ 2243 if(result>0) /* equivalent to previous set */ 2244 result = 0; 2245 } 2246 #endif 2247 return result; 2248 } 2249 2250 void unset_local_var(const char *name) 2251 { 2252 struct variables *cur; 2253 2254 if (name) { 2255 for (cur = top_vars; cur; cur=cur->next) { 2256 if(strcmp(cur->name, name)==0) 2257 break; 2258 } 2259 if (cur != NULL) { 2260 struct variables *next = top_vars; 2261 if(cur->flg_read_only) { 2262 error_msg("%s: readonly variable", name); 2263 return; 2264 } else { 2265 #ifndef __U_BOOT__ 2266 if(cur->flg_export) 2267 unenv_set(cur->name); 2268 #endif 2269 free(cur->name); 2270 free(cur->value); 2271 while (next->next != cur) 2272 next = next->next; 2273 next->next = cur->next; 2274 } 2275 free(cur); 2276 } 2277 } 2278 } 2279 2280 static int is_assignment(const char *s) 2281 { 2282 if (s == NULL) 2283 return 0; 2284 2285 if (!isalpha(*s)) return 0; 2286 ++s; 2287 while(isalnum(*s) || *s=='_') ++s; 2288 return *s=='='; 2289 } 2290 2291 #ifndef __U_BOOT__ 2292 /* the src parameter allows us to peek forward to a possible &n syntax 2293 * for file descriptor duplication, e.g., "2>&1". 2294 * Return code is 0 normally, 1 if a syntax error is detected in src. 2295 * Resource errors (in xmalloc) cause the process to exit */ 2296 static int setup_redirect(struct p_context *ctx, int fd, redir_type style, 2297 struct in_str *input) 2298 { 2299 struct child_prog *child=ctx->child; 2300 struct redir_struct *redir = child->redirects; 2301 struct redir_struct *last_redir=NULL; 2302 2303 /* Create a new redir_struct and drop it onto the end of the linked list */ 2304 while(redir) { 2305 last_redir=redir; 2306 redir=redir->next; 2307 } 2308 redir = xmalloc(sizeof(struct redir_struct)); 2309 redir->next=NULL; 2310 redir->word.gl_pathv=NULL; 2311 if (last_redir) { 2312 last_redir->next=redir; 2313 } else { 2314 child->redirects=redir; 2315 } 2316 2317 redir->type=style; 2318 redir->fd= (fd==-1) ? redir_table[style].default_fd : fd ; 2319 2320 debug_printf("Redirect type %d%s\n", redir->fd, redir_table[style].descrip); 2321 2322 /* Check for a '2>&1' type redirect */ 2323 redir->dup = redirect_dup_num(input); 2324 if (redir->dup == -2) return 1; /* syntax error */ 2325 if (redir->dup != -1) { 2326 /* Erik had a check here that the file descriptor in question 2327 * is legit; I postpone that to "run time" 2328 * A "-" representation of "close me" shows up as a -3 here */ 2329 debug_printf("Duplicating redirect '%d>&%d'\n", redir->fd, redir->dup); 2330 } else { 2331 /* We do _not_ try to open the file that src points to, 2332 * since we need to return and let src be expanded first. 2333 * Set ctx->pending_redirect, so we know what to do at the 2334 * end of the next parsed word. 2335 */ 2336 ctx->pending_redirect = redir; 2337 } 2338 return 0; 2339 } 2340 #endif 2341 2342 static struct pipe *new_pipe(void) 2343 { 2344 struct pipe *pi; 2345 pi = xmalloc(sizeof(struct pipe)); 2346 pi->num_progs = 0; 2347 pi->progs = NULL; 2348 pi->next = NULL; 2349 pi->followup = 0; /* invalid */ 2350 pi->r_mode = RES_NONE; 2351 return pi; 2352 } 2353 2354 static void initialize_context(struct p_context *ctx) 2355 { 2356 ctx->pipe=NULL; 2357 #ifndef __U_BOOT__ 2358 ctx->pending_redirect=NULL; 2359 #endif 2360 ctx->child=NULL; 2361 ctx->list_head=new_pipe(); 2362 ctx->pipe=ctx->list_head; 2363 ctx->w=RES_NONE; 2364 ctx->stack=NULL; 2365 #ifdef __U_BOOT__ 2366 ctx->old_flag=0; 2367 #endif 2368 done_command(ctx); /* creates the memory for working child */ 2369 } 2370 2371 /* normal return is 0 2372 * if a reserved word is found, and processed, return 1 2373 * should handle if, then, elif, else, fi, for, while, until, do, done. 2374 * case, function, and select are obnoxious, save those for later. 2375 */ 2376 struct reserved_combo { 2377 char *literal; 2378 int code; 2379 long flag; 2380 }; 2381 /* Mostly a list of accepted follow-up reserved words. 2382 * FLAG_END means we are done with the sequence, and are ready 2383 * to turn the compound list into a command. 2384 * FLAG_START means the word must start a new compound list. 2385 */ 2386 static struct reserved_combo reserved_list[] = { 2387 { "if", RES_IF, FLAG_THEN | FLAG_START }, 2388 { "then", RES_THEN, FLAG_ELIF | FLAG_ELSE | FLAG_FI }, 2389 { "elif", RES_ELIF, FLAG_THEN }, 2390 { "else", RES_ELSE, FLAG_FI }, 2391 { "fi", RES_FI, FLAG_END }, 2392 { "for", RES_FOR, FLAG_IN | FLAG_START }, 2393 { "while", RES_WHILE, FLAG_DO | FLAG_START }, 2394 { "until", RES_UNTIL, FLAG_DO | FLAG_START }, 2395 { "in", RES_IN, FLAG_DO }, 2396 { "do", RES_DO, FLAG_DONE }, 2397 { "done", RES_DONE, FLAG_END } 2398 }; 2399 #define NRES (sizeof(reserved_list)/sizeof(struct reserved_combo)) 2400 2401 static int reserved_word(o_string *dest, struct p_context *ctx) 2402 { 2403 struct reserved_combo *r; 2404 for (r=reserved_list; 2405 r<reserved_list+NRES; r++) { 2406 if (strcmp(dest->data, r->literal) == 0) { 2407 debug_printf("found reserved word %s, code %d\n",r->literal,r->code); 2408 if (r->flag & FLAG_START) { 2409 struct p_context *new = xmalloc(sizeof(struct p_context)); 2410 debug_printf("push stack\n"); 2411 if (ctx->w == RES_IN || ctx->w == RES_FOR) { 2412 syntax(); 2413 free(new); 2414 ctx->w = RES_SNTX; 2415 b_reset(dest); 2416 return 1; 2417 } 2418 *new = *ctx; /* physical copy */ 2419 initialize_context(ctx); 2420 ctx->stack=new; 2421 } else if ( ctx->w == RES_NONE || ! (ctx->old_flag & (1<<r->code))) { 2422 syntax(); 2423 ctx->w = RES_SNTX; 2424 b_reset(dest); 2425 return 1; 2426 } 2427 ctx->w=r->code; 2428 ctx->old_flag = r->flag; 2429 if (ctx->old_flag & FLAG_END) { 2430 struct p_context *old; 2431 debug_printf("pop stack\n"); 2432 done_pipe(ctx,PIPE_SEQ); 2433 old = ctx->stack; 2434 old->child->group = ctx->list_head; 2435 #ifndef __U_BOOT__ 2436 old->child->subshell = 0; 2437 #endif 2438 *ctx = *old; /* physical copy */ 2439 free(old); 2440 } 2441 b_reset (dest); 2442 return 1; 2443 } 2444 } 2445 return 0; 2446 } 2447 2448 /* normal return is 0. 2449 * Syntax or xglob errors return 1. */ 2450 static int done_word(o_string *dest, struct p_context *ctx) 2451 { 2452 struct child_prog *child=ctx->child; 2453 #ifndef __U_BOOT__ 2454 glob_t *glob_target; 2455 int gr, flags = 0; 2456 #else 2457 char *str, *s; 2458 int argc, cnt; 2459 #endif 2460 2461 debug_printf("done_word: %s %p\n", dest->data, child); 2462 if (dest->length == 0 && !dest->nonnull) { 2463 debug_printf(" true null, ignored\n"); 2464 return 0; 2465 } 2466 #ifndef __U_BOOT__ 2467 if (ctx->pending_redirect) { 2468 glob_target = &ctx->pending_redirect->word; 2469 } else { 2470 #endif 2471 if (child->group) { 2472 syntax(); 2473 return 1; /* syntax error, groups and arglists don't mix */ 2474 } 2475 if (!child->argv && (ctx->type & FLAG_PARSE_SEMICOLON)) { 2476 debug_printf("checking %s for reserved-ness\n",dest->data); 2477 if (reserved_word(dest,ctx)) return ctx->w==RES_SNTX; 2478 } 2479 #ifndef __U_BOOT__ 2480 glob_target = &child->glob_result; 2481 if (child->argv) flags |= GLOB_APPEND; 2482 #else 2483 for (cnt = 1, s = dest->data; s && *s; s++) { 2484 if (*s == '\\') s++; 2485 cnt++; 2486 } 2487 str = malloc(cnt); 2488 if (!str) return 1; 2489 if ( child->argv == NULL) { 2490 child->argc=0; 2491 } 2492 argc = ++child->argc; 2493 child->argv = realloc(child->argv, (argc+1)*sizeof(*child->argv)); 2494 if (child->argv == NULL) { 2495 free(str); 2496 return 1; 2497 } 2498 child->argv_nonnull = realloc(child->argv_nonnull, 2499 (argc+1)*sizeof(*child->argv_nonnull)); 2500 if (child->argv_nonnull == NULL) { 2501 free(str); 2502 return 1; 2503 } 2504 child->argv[argc-1]=str; 2505 child->argv_nonnull[argc-1] = dest->nonnull; 2506 child->argv[argc]=NULL; 2507 child->argv_nonnull[argc] = 0; 2508 for (s = dest->data; s && *s; s++,str++) { 2509 if (*s == '\\') s++; 2510 *str = *s; 2511 } 2512 *str = '\0'; 2513 #endif 2514 #ifndef __U_BOOT__ 2515 } 2516 gr = xglob(dest, flags, glob_target); 2517 if (gr != 0) return 1; 2518 #endif 2519 2520 b_reset(dest); 2521 #ifndef __U_BOOT__ 2522 if (ctx->pending_redirect) { 2523 ctx->pending_redirect=NULL; 2524 if (glob_target->gl_pathc != 1) { 2525 error_msg("ambiguous redirect"); 2526 return 1; 2527 } 2528 } else { 2529 child->argv = glob_target->gl_pathv; 2530 } 2531 #endif 2532 if (ctx->w == RES_FOR) { 2533 done_word(dest,ctx); 2534 done_pipe(ctx,PIPE_SEQ); 2535 } 2536 return 0; 2537 } 2538 2539 /* The only possible error here is out of memory, in which case 2540 * xmalloc exits. */ 2541 static int done_command(struct p_context *ctx) 2542 { 2543 /* The child is really already in the pipe structure, so 2544 * advance the pipe counter and make a new, null child. 2545 * Only real trickiness here is that the uncommitted 2546 * child structure, to which ctx->child points, is not 2547 * counted in pi->num_progs. */ 2548 struct pipe *pi=ctx->pipe; 2549 struct child_prog *prog=ctx->child; 2550 2551 if (prog && prog->group == NULL 2552 && prog->argv == NULL 2553 #ifndef __U_BOOT__ 2554 && prog->redirects == NULL) { 2555 #else 2556 ) { 2557 #endif 2558 debug_printf("done_command: skipping null command\n"); 2559 return 0; 2560 } else if (prog) { 2561 pi->num_progs++; 2562 debug_printf("done_command: num_progs incremented to %d\n",pi->num_progs); 2563 } else { 2564 debug_printf("done_command: initializing\n"); 2565 } 2566 pi->progs = xrealloc(pi->progs, sizeof(*pi->progs) * (pi->num_progs+1)); 2567 2568 prog = pi->progs + pi->num_progs; 2569 #ifndef __U_BOOT__ 2570 prog->redirects = NULL; 2571 #endif 2572 prog->argv = NULL; 2573 prog->argv_nonnull = NULL; 2574 #ifndef __U_BOOT__ 2575 prog->is_stopped = 0; 2576 #endif 2577 prog->group = NULL; 2578 #ifndef __U_BOOT__ 2579 prog->glob_result.gl_pathv = NULL; 2580 prog->family = pi; 2581 #endif 2582 prog->sp = 0; 2583 ctx->child = prog; 2584 prog->type = ctx->type; 2585 2586 /* but ctx->pipe and ctx->list_head remain unchanged */ 2587 return 0; 2588 } 2589 2590 static int done_pipe(struct p_context *ctx, pipe_style type) 2591 { 2592 struct pipe *new_p; 2593 done_command(ctx); /* implicit closure of previous command */ 2594 debug_printf("done_pipe, type %d\n", type); 2595 ctx->pipe->followup = type; 2596 ctx->pipe->r_mode = ctx->w; 2597 new_p=new_pipe(); 2598 ctx->pipe->next = new_p; 2599 ctx->pipe = new_p; 2600 ctx->child = NULL; 2601 done_command(ctx); /* set up new pipe to accept commands */ 2602 return 0; 2603 } 2604 2605 #ifndef __U_BOOT__ 2606 /* peek ahead in the in_str to find out if we have a "&n" construct, 2607 * as in "2>&1", that represents duplicating a file descriptor. 2608 * returns either -2 (syntax error), -1 (no &), or the number found. 2609 */ 2610 static int redirect_dup_num(struct in_str *input) 2611 { 2612 int ch, d=0, ok=0; 2613 ch = b_peek(input); 2614 if (ch != '&') return -1; 2615 2616 b_getch(input); /* get the & */ 2617 ch=b_peek(input); 2618 if (ch == '-') { 2619 b_getch(input); 2620 return -3; /* "-" represents "close me" */ 2621 } 2622 while (isdigit(ch)) { 2623 d = d*10+(ch-'0'); 2624 ok=1; 2625 b_getch(input); 2626 ch = b_peek(input); 2627 } 2628 if (ok) return d; 2629 2630 error_msg("ambiguous redirect"); 2631 return -2; 2632 } 2633 2634 /* If a redirect is immediately preceded by a number, that number is 2635 * supposed to tell which file descriptor to redirect. This routine 2636 * looks for such preceding numbers. In an ideal world this routine 2637 * needs to handle all the following classes of redirects... 2638 * echo 2>foo # redirects fd 2 to file "foo", nothing passed to echo 2639 * echo 49>foo # redirects fd 49 to file "foo", nothing passed to echo 2640 * echo -2>foo # redirects fd 1 to file "foo", "-2" passed to echo 2641 * echo 49x>foo # redirects fd 1 to file "foo", "49x" passed to echo 2642 * A -1 output from this program means no valid number was found, so the 2643 * caller should use the appropriate default for this redirection. 2644 */ 2645 static int redirect_opt_num(o_string *o) 2646 { 2647 int num; 2648 2649 if (o->length==0) return -1; 2650 for(num=0; num<o->length; num++) { 2651 if (!isdigit(*(o->data+num))) { 2652 return -1; 2653 } 2654 } 2655 /* reuse num (and save an int) */ 2656 num=atoi(o->data); 2657 b_reset(o); 2658 return num; 2659 } 2660 2661 FILE *generate_stream_from_list(struct pipe *head) 2662 { 2663 FILE *pf; 2664 #if 1 2665 int pid, channel[2]; 2666 if (pipe(channel)<0) perror_msg_and_die("pipe"); 2667 pid=fork(); 2668 if (pid<0) { 2669 perror_msg_and_die("fork"); 2670 } else if (pid==0) { 2671 close(channel[0]); 2672 if (channel[1] != 1) { 2673 dup2(channel[1],1); 2674 close(channel[1]); 2675 } 2676 #if 0 2677 #define SURROGATE "surrogate response" 2678 write(1,SURROGATE,sizeof(SURROGATE)); 2679 _exit(run_list(head)); 2680 #else 2681 _exit(run_list_real(head)); /* leaks memory */ 2682 #endif 2683 } 2684 debug_printf("forked child %d\n",pid); 2685 close(channel[1]); 2686 pf = fdopen(channel[0],"r"); 2687 debug_printf("pipe on FILE *%p\n",pf); 2688 #else 2689 free_pipe_list(head,0); 2690 pf=popen("echo surrogate response","r"); 2691 debug_printf("started fake pipe on FILE *%p\n",pf); 2692 #endif 2693 return pf; 2694 } 2695 2696 /* this version hacked for testing purposes */ 2697 /* return code is exit status of the process that is run. */ 2698 static int process_command_subs(o_string *dest, struct p_context *ctx, struct in_str *input, int subst_end) 2699 { 2700 int retcode; 2701 o_string result=NULL_O_STRING; 2702 struct p_context inner; 2703 FILE *p; 2704 struct in_str pipe_str; 2705 initialize_context(&inner); 2706 2707 /* recursion to generate command */ 2708 retcode = parse_stream(&result, &inner, input, subst_end); 2709 if (retcode != 0) return retcode; /* syntax error or EOF */ 2710 done_word(&result, &inner); 2711 done_pipe(&inner, PIPE_SEQ); 2712 b_free(&result); 2713 2714 p=generate_stream_from_list(inner.list_head); 2715 if (p==NULL) return 1; 2716 mark_open(fileno(p)); 2717 setup_file_in_str(&pipe_str, p); 2718 2719 /* now send results of command back into original context */ 2720 retcode = parse_stream(dest, ctx, &pipe_str, '\0'); 2721 /* XXX In case of a syntax error, should we try to kill the child? 2722 * That would be tough to do right, so just read until EOF. */ 2723 if (retcode == 1) { 2724 while (b_getch(&pipe_str)!=EOF) { /* discard */ }; 2725 } 2726 2727 debug_printf("done reading from pipe, pclose()ing\n"); 2728 /* This is the step that wait()s for the child. Should be pretty 2729 * safe, since we just read an EOF from its stdout. We could try 2730 * to better, by using wait(), and keeping track of background jobs 2731 * at the same time. That would be a lot of work, and contrary 2732 * to the KISS philosophy of this program. */ 2733 mark_closed(fileno(p)); 2734 retcode=pclose(p); 2735 free_pipe_list(inner.list_head,0); 2736 debug_printf("pclosed, retcode=%d\n",retcode); 2737 /* XXX this process fails to trim a single trailing newline */ 2738 return retcode; 2739 } 2740 2741 static int parse_group(o_string *dest, struct p_context *ctx, 2742 struct in_str *input, int ch) 2743 { 2744 int rcode, endch=0; 2745 struct p_context sub; 2746 struct child_prog *child = ctx->child; 2747 if (child->argv) { 2748 syntax(); 2749 return 1; /* syntax error, groups and arglists don't mix */ 2750 } 2751 initialize_context(&sub); 2752 switch(ch) { 2753 case '(': endch=')'; child->subshell=1; break; 2754 case '{': endch='}'; break; 2755 default: syntax(); /* really logic error */ 2756 } 2757 rcode=parse_stream(dest,&sub,input,endch); 2758 done_word(dest,&sub); /* finish off the final word in the subcontext */ 2759 done_pipe(&sub, PIPE_SEQ); /* and the final command there, too */ 2760 child->group = sub.list_head; 2761 return rcode; 2762 /* child remains "open", available for possible redirects */ 2763 } 2764 #endif 2765 2766 /* basically useful version until someone wants to get fancier, 2767 * see the bash man page under "Parameter Expansion" */ 2768 static char *lookup_param(char *src) 2769 { 2770 char *p; 2771 char *sep; 2772 char *default_val = NULL; 2773 int assign = 0; 2774 int expand_empty = 0; 2775 2776 if (!src) 2777 return NULL; 2778 2779 sep = strchr(src, ':'); 2780 2781 if (sep) { 2782 *sep = '\0'; 2783 if (*(sep + 1) == '-') 2784 default_val = sep+2; 2785 if (*(sep + 1) == '=') { 2786 default_val = sep+2; 2787 assign = 1; 2788 } 2789 if (*(sep + 1) == '+') { 2790 default_val = sep+2; 2791 expand_empty = 1; 2792 } 2793 } 2794 2795 p = env_get(src); 2796 if (!p) 2797 p = get_local_var(src); 2798 2799 if (!p || strlen(p) == 0) { 2800 p = default_val; 2801 if (assign) { 2802 char *var = malloc(strlen(src)+strlen(default_val)+2); 2803 if (var) { 2804 sprintf(var, "%s=%s", src, default_val); 2805 set_local_var(var, 0); 2806 } 2807 free(var); 2808 } 2809 } else if (expand_empty) { 2810 p += strlen(p); 2811 } 2812 2813 if (sep) 2814 *sep = ':'; 2815 2816 return p; 2817 } 2818 2819 #ifdef __U_BOOT__ 2820 static char *get_dollar_var(char ch) 2821 { 2822 static char buf[40]; 2823 2824 buf[0] = '\0'; 2825 switch (ch) { 2826 case '?': 2827 sprintf(buf, "%u", (unsigned int)last_return_code); 2828 break; 2829 default: 2830 return NULL; 2831 } 2832 return buf; 2833 } 2834 #endif 2835 2836 /* return code: 0 for OK, 1 for syntax error */ 2837 static int handle_dollar(o_string *dest, struct p_context *ctx, struct in_str *input) 2838 { 2839 #ifndef __U_BOOT__ 2840 int i, advance=0; 2841 #else 2842 int advance=0; 2843 #endif 2844 #ifndef __U_BOOT__ 2845 char sep[]=" "; 2846 #endif 2847 int ch = input->peek(input); /* first character after the $ */ 2848 debug_printf("handle_dollar: ch=%c\n",ch); 2849 if (isalpha(ch)) { 2850 b_addchr(dest, SPECIAL_VAR_SYMBOL); 2851 ctx->child->sp++; 2852 while(ch=b_peek(input),isalnum(ch) || ch=='_') { 2853 b_getch(input); 2854 b_addchr(dest,ch); 2855 } 2856 b_addchr(dest, SPECIAL_VAR_SYMBOL); 2857 #ifndef __U_BOOT__ 2858 } else if (isdigit(ch)) { 2859 i = ch-'0'; /* XXX is $0 special? */ 2860 if (i<global_argc) { 2861 parse_string(dest, ctx, global_argv[i]); /* recursion */ 2862 } 2863 advance = 1; 2864 #endif 2865 } else switch (ch) { 2866 #ifndef __U_BOOT__ 2867 case '$': 2868 b_adduint(dest,getpid()); 2869 advance = 1; 2870 break; 2871 case '!': 2872 if (last_bg_pid > 0) b_adduint(dest, last_bg_pid); 2873 advance = 1; 2874 break; 2875 #endif 2876 case '?': 2877 #ifndef __U_BOOT__ 2878 b_adduint(dest,last_return_code); 2879 #else 2880 ctx->child->sp++; 2881 b_addchr(dest, SPECIAL_VAR_SYMBOL); 2882 b_addchr(dest, '$'); 2883 b_addchr(dest, '?'); 2884 b_addchr(dest, SPECIAL_VAR_SYMBOL); 2885 #endif 2886 advance = 1; 2887 break; 2888 #ifndef __U_BOOT__ 2889 case '#': 2890 b_adduint(dest,global_argc ? global_argc-1 : 0); 2891 advance = 1; 2892 break; 2893 #endif 2894 case '{': 2895 b_addchr(dest, SPECIAL_VAR_SYMBOL); 2896 ctx->child->sp++; 2897 b_getch(input); 2898 /* XXX maybe someone will try to escape the '}' */ 2899 while(ch=b_getch(input),ch!=EOF && ch!='}') { 2900 b_addchr(dest,ch); 2901 } 2902 if (ch != '}') { 2903 syntax(); 2904 return 1; 2905 } 2906 b_addchr(dest, SPECIAL_VAR_SYMBOL); 2907 break; 2908 #ifndef __U_BOOT__ 2909 case '(': 2910 b_getch(input); 2911 process_command_subs(dest, ctx, input, ')'); 2912 break; 2913 case '*': 2914 sep[0]=ifs[0]; 2915 for (i=1; i<global_argc; i++) { 2916 parse_string(dest, ctx, global_argv[i]); 2917 if (i+1 < global_argc) parse_string(dest, ctx, sep); 2918 } 2919 break; 2920 case '@': 2921 case '-': 2922 case '_': 2923 /* still unhandled, but should be eventually */ 2924 error_msg("unhandled syntax: $%c",ch); 2925 return 1; 2926 break; 2927 #endif 2928 default: 2929 b_addqchr(dest,'$',dest->quote); 2930 } 2931 /* Eat the character if the flag was set. If the compiler 2932 * is smart enough, we could substitute "b_getch(input);" 2933 * for all the "advance = 1;" above, and also end up with 2934 * a nice size-optimized program. Hah! That'll be the day. 2935 */ 2936 if (advance) b_getch(input); 2937 return 0; 2938 } 2939 2940 #ifndef __U_BOOT__ 2941 int parse_string(o_string *dest, struct p_context *ctx, const char *src) 2942 { 2943 struct in_str foo; 2944 setup_string_in_str(&foo, src); 2945 return parse_stream(dest, ctx, &foo, '\0'); 2946 } 2947 #endif 2948 2949 /* return code is 0 for normal exit, 1 for syntax error */ 2950 static int parse_stream(o_string *dest, struct p_context *ctx, 2951 struct in_str *input, int end_trigger) 2952 { 2953 unsigned int ch, m; 2954 #ifndef __U_BOOT__ 2955 int redir_fd; 2956 redir_type redir_style; 2957 #endif 2958 int next; 2959 2960 /* Only double-quote state is handled in the state variable dest->quote. 2961 * A single-quote triggers a bypass of the main loop until its mate is 2962 * found. When recursing, quote state is passed in via dest->quote. */ 2963 2964 debug_printf("parse_stream, end_trigger=%d\n",end_trigger); 2965 while ((ch=b_getch(input))!=EOF) { 2966 m = map[ch]; 2967 #ifdef __U_BOOT__ 2968 if (input->__promptme == 0) return 1; 2969 #endif 2970 next = (ch == '\n') ? 0 : b_peek(input); 2971 2972 debug_printf("parse_stream: ch=%c (%d) m=%d quote=%d - %c\n", 2973 ch >= ' ' ? ch : '.', ch, m, 2974 dest->quote, ctx->stack == NULL ? '*' : '.'); 2975 2976 if (m==0 || ((m==1 || m==2) && dest->quote)) { 2977 b_addqchr(dest, ch, dest->quote); 2978 } else { 2979 if (m==2) { /* unquoted IFS */ 2980 if (done_word(dest, ctx)) { 2981 return 1; 2982 } 2983 /* If we aren't performing a substitution, treat a newline as a 2984 * command separator. */ 2985 if (end_trigger != '\0' && ch=='\n') 2986 done_pipe(ctx,PIPE_SEQ); 2987 } 2988 if (ch == end_trigger && !dest->quote && ctx->w==RES_NONE) { 2989 debug_printf("leaving parse_stream (triggered)\n"); 2990 return 0; 2991 } 2992 #if 0 2993 if (ch=='\n') { 2994 /* Yahoo! Time to run with it! */ 2995 done_pipe(ctx,PIPE_SEQ); 2996 run_list(ctx->list_head); 2997 initialize_context(ctx); 2998 } 2999 #endif 3000 if (m!=2) switch (ch) { 3001 case '#': 3002 if (dest->length == 0 && !dest->quote) { 3003 while(ch=b_peek(input),ch!=EOF && ch!='\n') { b_getch(input); } 3004 } else { 3005 b_addqchr(dest, ch, dest->quote); 3006 } 3007 break; 3008 case '\\': 3009 if (next == EOF) { 3010 syntax(); 3011 return 1; 3012 } 3013 b_addqchr(dest, '\\', dest->quote); 3014 b_addqchr(dest, b_getch(input), dest->quote); 3015 break; 3016 case '$': 3017 if (handle_dollar(dest, ctx, input)!=0) return 1; 3018 break; 3019 case '\'': 3020 dest->nonnull = 1; 3021 while(ch=b_getch(input),ch!=EOF && ch!='\'') { 3022 #ifdef __U_BOOT__ 3023 if(input->__promptme == 0) return 1; 3024 #endif 3025 b_addchr(dest,ch); 3026 } 3027 if (ch==EOF) { 3028 syntax(); 3029 return 1; 3030 } 3031 break; 3032 case '"': 3033 dest->nonnull = 1; 3034 dest->quote = !dest->quote; 3035 break; 3036 #ifndef __U_BOOT__ 3037 case '`': 3038 process_command_subs(dest, ctx, input, '`'); 3039 break; 3040 case '>': 3041 redir_fd = redirect_opt_num(dest); 3042 done_word(dest, ctx); 3043 redir_style=REDIRECT_OVERWRITE; 3044 if (next == '>') { 3045 redir_style=REDIRECT_APPEND; 3046 b_getch(input); 3047 } else if (next == '(') { 3048 syntax(); /* until we support >(list) Process Substitution */ 3049 return 1; 3050 } 3051 setup_redirect(ctx, redir_fd, redir_style, input); 3052 break; 3053 case '<': 3054 redir_fd = redirect_opt_num(dest); 3055 done_word(dest, ctx); 3056 redir_style=REDIRECT_INPUT; 3057 if (next == '<') { 3058 redir_style=REDIRECT_HEREIS; 3059 b_getch(input); 3060 } else if (next == '>') { 3061 redir_style=REDIRECT_IO; 3062 b_getch(input); 3063 } else if (next == '(') { 3064 syntax(); /* until we support <(list) Process Substitution */ 3065 return 1; 3066 } 3067 setup_redirect(ctx, redir_fd, redir_style, input); 3068 break; 3069 #endif 3070 case ';': 3071 done_word(dest, ctx); 3072 done_pipe(ctx,PIPE_SEQ); 3073 break; 3074 case '&': 3075 done_word(dest, ctx); 3076 if (next=='&') { 3077 b_getch(input); 3078 done_pipe(ctx,PIPE_AND); 3079 } else { 3080 #ifndef __U_BOOT__ 3081 done_pipe(ctx,PIPE_BG); 3082 #else 3083 syntax_err(); 3084 return 1; 3085 #endif 3086 } 3087 break; 3088 case '|': 3089 done_word(dest, ctx); 3090 if (next=='|') { 3091 b_getch(input); 3092 done_pipe(ctx,PIPE_OR); 3093 } else { 3094 /* we could pick up a file descriptor choice here 3095 * with redirect_opt_num(), but bash doesn't do it. 3096 * "echo foo 2| cat" yields "foo 2". */ 3097 #ifndef __U_BOOT__ 3098 done_command(ctx); 3099 #else 3100 syntax_err(); 3101 return 1; 3102 #endif 3103 } 3104 break; 3105 #ifndef __U_BOOT__ 3106 case '(': 3107 case '{': 3108 if (parse_group(dest, ctx, input, ch)!=0) return 1; 3109 break; 3110 case ')': 3111 case '}': 3112 syntax(); /* Proper use of this character caught by end_trigger */ 3113 return 1; 3114 break; 3115 #endif 3116 case SUBSTED_VAR_SYMBOL: 3117 dest->nonnull = 1; 3118 while (ch = b_getch(input), ch != EOF && 3119 ch != SUBSTED_VAR_SYMBOL) { 3120 debug_printf("subst, pass=%d\n", ch); 3121 if (input->__promptme == 0) 3122 return 1; 3123 b_addchr(dest, ch); 3124 } 3125 debug_printf("subst, term=%d\n", ch); 3126 if (ch == EOF) { 3127 syntax(); 3128 return 1; 3129 } 3130 break; 3131 default: 3132 syntax(); /* this is really an internal logic error */ 3133 return 1; 3134 } 3135 } 3136 } 3137 /* complain if quote? No, maybe we just finished a command substitution 3138 * that was quoted. Example: 3139 * $ echo "`cat foo` plus more" 3140 * and we just got the EOF generated by the subshell that ran "cat foo" 3141 * The only real complaint is if we got an EOF when end_trigger != '\0', 3142 * that is, we were really supposed to get end_trigger, and never got 3143 * one before the EOF. Can't use the standard "syntax error" return code, 3144 * so that parse_stream_outer can distinguish the EOF and exit smoothly. */ 3145 debug_printf("leaving parse_stream (EOF)\n"); 3146 if (end_trigger != '\0') return -1; 3147 return 0; 3148 } 3149 3150 static void mapset(const unsigned char *set, int code) 3151 { 3152 const unsigned char *s; 3153 for (s=set; *s; s++) map[*s] = code; 3154 } 3155 3156 static void update_ifs_map(void) 3157 { 3158 /* char *ifs and char map[256] are both globals. */ 3159 ifs = (uchar *)env_get("IFS"); 3160 if (ifs == NULL) ifs=(uchar *)" \t\n"; 3161 /* Precompute a list of 'flow through' behavior so it can be treated 3162 * quickly up front. Computation is necessary because of IFS. 3163 * Special case handling of IFS == " \t\n" is not implemented. 3164 * The map[] array only really needs two bits each, and on most machines 3165 * that would be faster because of the reduced L1 cache footprint. 3166 */ 3167 memset(map,0,sizeof(map)); /* most characters flow through always */ 3168 #ifndef __U_BOOT__ 3169 mapset((uchar *)"\\$'\"`", 3); /* never flow through */ 3170 mapset((uchar *)"<>;&|(){}#", 1); /* flow through if quoted */ 3171 #else 3172 { 3173 uchar subst[2] = {SUBSTED_VAR_SYMBOL, 0}; 3174 mapset(subst, 3); /* never flow through */ 3175 } 3176 mapset((uchar *)"\\$'\"", 3); /* never flow through */ 3177 mapset((uchar *)";&|#", 1); /* flow through if quoted */ 3178 #endif 3179 mapset(ifs, 2); /* also flow through if quoted */ 3180 } 3181 3182 /* most recursion does not come through here, the exeception is 3183 * from builtin_source() */ 3184 static int parse_stream_outer(struct in_str *inp, int flag) 3185 { 3186 3187 struct p_context ctx; 3188 o_string temp=NULL_O_STRING; 3189 int rcode; 3190 #ifdef __U_BOOT__ 3191 int code = 1; 3192 #endif 3193 do { 3194 ctx.type = flag; 3195 initialize_context(&ctx); 3196 update_ifs_map(); 3197 if (!(flag & FLAG_PARSE_SEMICOLON) || (flag & FLAG_REPARSING)) mapset((uchar *)";$&|", 0); 3198 inp->promptmode=1; 3199 rcode = parse_stream(&temp, &ctx, inp, 3200 flag & FLAG_CONT_ON_NEWLINE ? -1 : '\n'); 3201 #ifdef __U_BOOT__ 3202 if (rcode == 1) flag_repeat = 0; 3203 #endif 3204 if (rcode != 1 && ctx.old_flag != 0) { 3205 syntax(); 3206 #ifdef __U_BOOT__ 3207 flag_repeat = 0; 3208 #endif 3209 } 3210 if (rcode != 1 && ctx.old_flag == 0) { 3211 done_word(&temp, &ctx); 3212 done_pipe(&ctx,PIPE_SEQ); 3213 #ifndef __U_BOOT__ 3214 run_list(ctx.list_head); 3215 #else 3216 code = run_list(ctx.list_head); 3217 if (code == -2) { /* exit */ 3218 b_free(&temp); 3219 code = 0; 3220 /* XXX hackish way to not allow exit from main loop */ 3221 if (inp->peek == file_peek) { 3222 printf("exit not allowed from main input shell.\n"); 3223 continue; 3224 } 3225 break; 3226 } 3227 if (code == -1) 3228 flag_repeat = 0; 3229 #endif 3230 } else { 3231 if (ctx.old_flag != 0) { 3232 free(ctx.stack); 3233 b_reset(&temp); 3234 } 3235 #ifdef __U_BOOT__ 3236 if (inp->__promptme == 0) printf("<INTERRUPT>\n"); 3237 inp->__promptme = 1; 3238 #endif 3239 temp.nonnull = 0; 3240 temp.quote = 0; 3241 inp->p = NULL; 3242 free_pipe_list(ctx.list_head,0); 3243 } 3244 b_free(&temp); 3245 /* loop on syntax errors, return on EOF */ 3246 } while (rcode != -1 && !(flag & FLAG_EXIT_FROM_LOOP) && 3247 (inp->peek != static_peek || b_peek(inp))); 3248 #ifndef __U_BOOT__ 3249 return 0; 3250 #else 3251 return (code != 0) ? 1 : 0; 3252 #endif /* __U_BOOT__ */ 3253 } 3254 3255 #ifndef __U_BOOT__ 3256 static int parse_string_outer(const char *s, int flag) 3257 #else 3258 int parse_string_outer(const char *s, int flag) 3259 #endif /* __U_BOOT__ */ 3260 { 3261 struct in_str input; 3262 #ifdef __U_BOOT__ 3263 char *p = NULL; 3264 int rcode; 3265 if (!s) 3266 return 1; 3267 if (!*s) 3268 return 0; 3269 if (!(p = strchr(s, '\n')) || *++p) { 3270 p = xmalloc(strlen(s) + 2); 3271 strcpy(p, s); 3272 strcat(p, "\n"); 3273 setup_string_in_str(&input, p); 3274 rcode = parse_stream_outer(&input, flag); 3275 free(p); 3276 return rcode; 3277 } else { 3278 #endif 3279 setup_string_in_str(&input, s); 3280 return parse_stream_outer(&input, flag); 3281 #ifdef __U_BOOT__ 3282 } 3283 #endif 3284 } 3285 3286 #ifndef __U_BOOT__ 3287 static int parse_file_outer(FILE *f) 3288 #else 3289 int parse_file_outer(void) 3290 #endif 3291 { 3292 int rcode; 3293 struct in_str input; 3294 #ifndef __U_BOOT__ 3295 setup_file_in_str(&input, f); 3296 #else 3297 setup_file_in_str(&input); 3298 #endif 3299 rcode = parse_stream_outer(&input, FLAG_PARSE_SEMICOLON); 3300 return rcode; 3301 } 3302 3303 #ifdef __U_BOOT__ 3304 #ifdef CONFIG_NEEDS_MANUAL_RELOC 3305 static void u_boot_hush_reloc(void) 3306 { 3307 unsigned long addr; 3308 struct reserved_combo *r; 3309 3310 for (r=reserved_list; r<reserved_list+NRES; r++) { 3311 addr = (ulong) (r->literal) + gd->reloc_off; 3312 r->literal = (char *)addr; 3313 } 3314 } 3315 #endif 3316 3317 int u_boot_hush_start(void) 3318 { 3319 if (top_vars == NULL) { 3320 top_vars = malloc(sizeof(struct variables)); 3321 top_vars->name = "HUSH_VERSION"; 3322 top_vars->value = "0.01"; 3323 top_vars->next = NULL; 3324 top_vars->flg_export = 0; 3325 top_vars->flg_read_only = 1; 3326 #ifdef CONFIG_NEEDS_MANUAL_RELOC 3327 u_boot_hush_reloc(); 3328 #endif 3329 } 3330 return 0; 3331 } 3332 3333 static void *xmalloc(size_t size) 3334 { 3335 void *p = NULL; 3336 3337 if (!(p = malloc(size))) { 3338 printf("ERROR : memory not allocated\n"); 3339 for(;;); 3340 } 3341 return p; 3342 } 3343 3344 static void *xrealloc(void *ptr, size_t size) 3345 { 3346 void *p = NULL; 3347 3348 if (!(p = realloc(ptr, size))) { 3349 printf("ERROR : memory not allocated\n"); 3350 for(;;); 3351 } 3352 return p; 3353 } 3354 #endif /* __U_BOOT__ */ 3355 3356 #ifndef __U_BOOT__ 3357 /* Make sure we have a controlling tty. If we get started under a job 3358 * aware app (like bash for example), make sure we are now in charge so 3359 * we don't fight over who gets the foreground */ 3360 static void setup_job_control(void) 3361 { 3362 static pid_t shell_pgrp; 3363 /* Loop until we are in the foreground. */ 3364 while (tcgetpgrp (shell_terminal) != (shell_pgrp = getpgrp ())) 3365 kill (- shell_pgrp, SIGTTIN); 3366 3367 /* Ignore interactive and job-control signals. */ 3368 signal(SIGINT, SIG_IGN); 3369 signal(SIGQUIT, SIG_IGN); 3370 signal(SIGTERM, SIG_IGN); 3371 signal(SIGTSTP, SIG_IGN); 3372 signal(SIGTTIN, SIG_IGN); 3373 signal(SIGTTOU, SIG_IGN); 3374 signal(SIGCHLD, SIG_IGN); 3375 3376 /* Put ourselves in our own process group. */ 3377 setsid(); 3378 shell_pgrp = getpid (); 3379 setpgid (shell_pgrp, shell_pgrp); 3380 3381 /* Grab control of the terminal. */ 3382 tcsetpgrp(shell_terminal, shell_pgrp); 3383 } 3384 3385 int hush_main(int argc, char * const *argv) 3386 { 3387 int opt; 3388 FILE *input; 3389 char **e = environ; 3390 3391 /* XXX what should these be while sourcing /etc/profile? */ 3392 global_argc = argc; 3393 global_argv = argv; 3394 3395 /* (re?) initialize globals. Sometimes hush_main() ends up calling 3396 * hush_main(), therefore we cannot rely on the BSS to zero out this 3397 * stuff. Reset these to 0 every time. */ 3398 ifs = NULL; 3399 /* map[] is taken care of with call to update_ifs_map() */ 3400 fake_mode = 0; 3401 interactive = 0; 3402 close_me_head = NULL; 3403 last_bg_pid = 0; 3404 job_list = NULL; 3405 last_jobid = 0; 3406 3407 /* Initialize some more globals to non-zero values */ 3408 set_cwd(); 3409 #ifdef CONFIG_FEATURE_COMMAND_EDITING 3410 cmdedit_set_initial_prompt(); 3411 #else 3412 PS1 = NULL; 3413 #endif 3414 PS2 = "> "; 3415 3416 /* initialize our shell local variables with the values 3417 * currently living in the environment */ 3418 if (e) { 3419 for (; *e; e++) 3420 set_local_var(*e, 2); /* without call putenv() */ 3421 } 3422 3423 last_return_code=EXIT_SUCCESS; 3424 3425 3426 if (argv[0] && argv[0][0] == '-') { 3427 debug_printf("\nsourcing /etc/profile\n"); 3428 if ((input = fopen("/etc/profile", "r")) != NULL) { 3429 mark_open(fileno(input)); 3430 parse_file_outer(input); 3431 mark_closed(fileno(input)); 3432 fclose(input); 3433 } 3434 } 3435 input=stdin; 3436 3437 while ((opt = getopt(argc, argv, "c:xif")) > 0) { 3438 switch (opt) { 3439 case 'c': 3440 { 3441 global_argv = argv+optind; 3442 global_argc = argc-optind; 3443 opt = parse_string_outer(optarg, FLAG_PARSE_SEMICOLON); 3444 goto final_return; 3445 } 3446 break; 3447 case 'i': 3448 interactive++; 3449 break; 3450 case 'f': 3451 fake_mode++; 3452 break; 3453 default: 3454 #ifndef BB_VER 3455 fprintf(stderr, "Usage: sh [FILE]...\n" 3456 " or: sh -c command [args]...\n\n"); 3457 exit(EXIT_FAILURE); 3458 #else 3459 show_usage(); 3460 #endif 3461 } 3462 } 3463 /* A shell is interactive if the `-i' flag was given, or if all of 3464 * the following conditions are met: 3465 * no -c command 3466 * no arguments remaining or the -s flag given 3467 * standard input is a terminal 3468 * standard output is a terminal 3469 * Refer to Posix.2, the description of the `sh' utility. */ 3470 if (argv[optind]==NULL && input==stdin && 3471 isatty(fileno(stdin)) && isatty(fileno(stdout))) { 3472 interactive++; 3473 } 3474 3475 debug_printf("\ninteractive=%d\n", interactive); 3476 if (interactive) { 3477 /* Looks like they want an interactive shell */ 3478 #ifndef CONFIG_FEATURE_SH_EXTRA_QUIET 3479 printf( "\n\n" BB_BANNER " hush - the humble shell v0.01 (testing)\n"); 3480 printf( "Enter 'help' for a list of built-in commands.\n\n"); 3481 #endif 3482 setup_job_control(); 3483 } 3484 3485 if (argv[optind]==NULL) { 3486 opt=parse_file_outer(stdin); 3487 goto final_return; 3488 } 3489 3490 debug_printf("\nrunning script '%s'\n", argv[optind]); 3491 global_argv = argv+optind; 3492 global_argc = argc-optind; 3493 input = xfopen(argv[optind], "r"); 3494 opt = parse_file_outer(input); 3495 3496 #ifdef CONFIG_FEATURE_CLEAN_UP 3497 fclose(input); 3498 if (cwd && cwd != unknown) 3499 free((char*)cwd); 3500 { 3501 struct variables *cur, *tmp; 3502 for(cur = top_vars; cur; cur = tmp) { 3503 tmp = cur->next; 3504 if (!cur->flg_read_only) { 3505 free(cur->name); 3506 free(cur->value); 3507 free(cur); 3508 } 3509 } 3510 } 3511 #endif 3512 3513 final_return: 3514 return(opt?opt:last_return_code); 3515 } 3516 #endif 3517 3518 static char *insert_var_value(char *inp) 3519 { 3520 return insert_var_value_sub(inp, 0); 3521 } 3522 3523 static char *insert_var_value_sub(char *inp, int tag_subst) 3524 { 3525 int res_str_len = 0; 3526 int len; 3527 int done = 0; 3528 char *p, *p1, *res_str = NULL; 3529 3530 while ((p = strchr(inp, SPECIAL_VAR_SYMBOL))) { 3531 /* check the beginning of the string for normal characters */ 3532 if (p != inp) { 3533 /* copy any characters to the result string */ 3534 len = p - inp; 3535 res_str = xrealloc(res_str, (res_str_len + len)); 3536 strncpy((res_str + res_str_len), inp, len); 3537 res_str_len += len; 3538 } 3539 inp = ++p; 3540 /* find the ending marker */ 3541 p = strchr(inp, SPECIAL_VAR_SYMBOL); 3542 *p = '\0'; 3543 /* look up the value to substitute */ 3544 if ((p1 = lookup_param(inp))) { 3545 if (tag_subst) 3546 len = res_str_len + strlen(p1) + 2; 3547 else 3548 len = res_str_len + strlen(p1); 3549 res_str = xrealloc(res_str, (1 + len)); 3550 if (tag_subst) { 3551 /* 3552 * copy the variable value to the result 3553 * string 3554 */ 3555 strcpy((res_str + res_str_len + 1), p1); 3556 3557 /* 3558 * mark the replaced text to be accepted as 3559 * is 3560 */ 3561 res_str[res_str_len] = SUBSTED_VAR_SYMBOL; 3562 res_str[res_str_len + 1 + strlen(p1)] = 3563 SUBSTED_VAR_SYMBOL; 3564 } else 3565 /* 3566 * copy the variable value to the result 3567 * string 3568 */ 3569 strcpy((res_str + res_str_len), p1); 3570 3571 res_str_len = len; 3572 } 3573 *p = SPECIAL_VAR_SYMBOL; 3574 inp = ++p; 3575 done = 1; 3576 } 3577 if (done) { 3578 res_str = xrealloc(res_str, (1 + res_str_len + strlen(inp))); 3579 strcpy((res_str + res_str_len), inp); 3580 while ((p = strchr(res_str, '\n'))) { 3581 *p = ' '; 3582 } 3583 } 3584 return (res_str == NULL) ? inp : res_str; 3585 } 3586 3587 static char **make_list_in(char **inp, char *name) 3588 { 3589 int len, i; 3590 int name_len = strlen(name); 3591 int n = 0; 3592 char **list; 3593 char *p1, *p2, *p3; 3594 3595 /* create list of variable values */ 3596 list = xmalloc(sizeof(*list)); 3597 for (i = 0; inp[i]; i++) { 3598 p3 = insert_var_value(inp[i]); 3599 p1 = p3; 3600 while (*p1) { 3601 if (*p1 == ' ') { 3602 p1++; 3603 continue; 3604 } 3605 if ((p2 = strchr(p1, ' '))) { 3606 len = p2 - p1; 3607 } else { 3608 len = strlen(p1); 3609 p2 = p1 + len; 3610 } 3611 /* we use n + 2 in realloc for list,because we add 3612 * new element and then we will add NULL element */ 3613 list = xrealloc(list, sizeof(*list) * (n + 2)); 3614 list[n] = xmalloc(2 + name_len + len); 3615 strcpy(list[n], name); 3616 strcat(list[n], "="); 3617 strncat(list[n], p1, len); 3618 list[n++][name_len + len + 1] = '\0'; 3619 p1 = p2; 3620 } 3621 if (p3 != inp[i]) free(p3); 3622 } 3623 list[n] = NULL; 3624 return list; 3625 } 3626 3627 /* 3628 * Make new string for parser 3629 * inp - array of argument strings to flatten 3630 * nonnull - indicates argument was quoted when originally parsed 3631 */ 3632 static char *make_string(char **inp, int *nonnull) 3633 { 3634 char *p; 3635 char *str = NULL; 3636 int n; 3637 int len = 2; 3638 char *noeval_str; 3639 int noeval = 0; 3640 3641 noeval_str = get_local_var("HUSH_NO_EVAL"); 3642 if (noeval_str != NULL && *noeval_str != '0' && *noeval_str != '\0') 3643 noeval = 1; 3644 for (n = 0; inp[n]; n++) { 3645 p = insert_var_value_sub(inp[n], noeval); 3646 str = xrealloc(str, (len + strlen(p) + (2 * nonnull[n]))); 3647 if (n) { 3648 strcat(str, " "); 3649 } else { 3650 *str = '\0'; 3651 } 3652 if (nonnull[n]) 3653 strcat(str, "'"); 3654 strcat(str, p); 3655 if (nonnull[n]) 3656 strcat(str, "'"); 3657 len = strlen(str) + 3; 3658 if (p != inp[n]) free(p); 3659 } 3660 len = strlen(str); 3661 *(str + len) = '\n'; 3662 *(str + len + 1) = '\0'; 3663 return str; 3664 } 3665 3666 #ifdef __U_BOOT__ 3667 static int do_showvar(cmd_tbl_t *cmdtp, int flag, int argc, 3668 char * const argv[]) 3669 { 3670 int i, k; 3671 int rcode = 0; 3672 struct variables *cur; 3673 3674 if (argc == 1) { /* Print all env variables */ 3675 for (cur = top_vars; cur; cur = cur->next) { 3676 printf ("%s=%s\n", cur->name, cur->value); 3677 if (ctrlc ()) { 3678 puts ("\n ** Abort\n"); 3679 return 1; 3680 } 3681 } 3682 return 0; 3683 } 3684 for (i = 1; i < argc; ++i) { /* print single env variables */ 3685 char *name = argv[i]; 3686 3687 k = -1; 3688 for (cur = top_vars; cur; cur = cur->next) { 3689 if(strcmp (cur->name, name) == 0) { 3690 k = 0; 3691 printf ("%s=%s\n", cur->name, cur->value); 3692 } 3693 if (ctrlc ()) { 3694 puts ("\n ** Abort\n"); 3695 return 1; 3696 } 3697 } 3698 if (k < 0) { 3699 printf ("## Error: \"%s\" not defined\n", name); 3700 rcode ++; 3701 } 3702 } 3703 return rcode; 3704 } 3705 3706 U_BOOT_CMD( 3707 showvar, CONFIG_SYS_MAXARGS, 1, do_showvar, 3708 "print local hushshell variables", 3709 "\n - print values of all hushshell variables\n" 3710 "showvar name ...\n" 3711 " - print value of hushshell variable 'name'" 3712 ); 3713 3714 #endif 3715 /****************************************************************************/ 3716
