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