1/* 2 * sed.c - very minimalist version of sed 3 * 4 * Copyright (C) 1999,2000,2001 by Lineo, inc. 5 * Written by Mark Whitley <markw@lineo.com>, <markw@codepoet.org> 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License as published by 9 * the Free Software Foundation; either version 2 of the License, or 10 * (at your option) any later version. 11 * 12 * This program is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 15 * General Public License for more details. 16 * 17 * You should have received a copy of the GNU General Public License 18 * along with this program; if not, write to the Free Software 19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 20 * 21 */ 22 23/* 24 Supported features and commands in this version of sed: 25 26 - comments ('#') 27 - address matching: num|/matchstr/[,num|/matchstr/|$]command 28 - commands: (p)rint, (d)elete, (s)ubstitue (with g & I flags) 29 - edit commands: (a)ppend, (i)nsert, (c)hange 30 - file commands: (r)ead 31 - backreferences in substitution expressions (\1, \2...\9) 32 33 (Note: Specifying an address (range) to match is *optional*; commands 34 default to the whole pattern space if no specific address match was 35 requested.) 36 37 Unsupported features: 38 39 - transliteration (y/source-chars/dest-chars/) (use 'tr') 40 - no pattern space hold space storing / swapping (x, etc.) 41 - no labels / branching (: label, b, t, and friends) 42 - and lots, lots more. 43*/ 44 45#include <stdio.h> 46#include <unistd.h> /* for getopt() */ 47#include <regex.h> 48#include <string.h> /* for strdup() */ 49#include <errno.h> 50#include <ctype.h> /* for isspace() */ 51#include <stdlib.h> 52#include "busybox.h" 53 54/* externs */ 55extern void xregcomp(regex_t *preg, const char *regex, int cflags); 56extern int optind; /* in unistd.h */ 57extern char *optarg; /* ditto */ 58 59/* options */ 60static int be_quiet = 0; 61 62 63struct sed_cmd { 64 65 66 /* GENERAL FIELDS */ 67 char delimiter; /* The delimiter used to separate regexps */ 68 69 /* address storage */ 70 int beg_line; /* 'sed 1p' 0 == no begining line, apply commands to all lines */ 71 int end_line; /* 'sed 1,3p' 0 == no end line, use only beginning. -1 == $ */ 72 regex_t *beg_match; /* sed -e '/match/cmd' */ 73 regex_t *end_match; /* sed -e '/match/,/end_match/cmd' */ 74 75 /* the command */ 76 char cmd; /* p,d,s (add more at your leisure :-) */ 77 78 79 /* SUBSTITUTION COMMAND SPECIFIC FIELDS */ 80 81 /* sed -e 's/sub_match/replace/' */ 82 regex_t *sub_match; 83 char *replace; 84 unsigned int num_backrefs:4; /* how many back references (\1..\9) */ 85 /* Note: GNU/POSIX sed does not save more than nine backrefs, so 86 * we only use 4 bits to hold the number */ 87 unsigned int sub_g:1; /* sed -e 's/foo/bar/g' (global) */ 88 unsigned int sub_p:2; /* sed -e 's/foo/bar/p' (print substitution) */ 89 90 91 /* EDIT COMMAND (a,i,c) SPEICIFIC FIELDS */ 92 93 char *editline; 94 95 96 /* FILE COMMAND (r) SPEICIFIC FIELDS */ 97 98 char *filename; 99}; 100 101/* globals */ 102static struct sed_cmd *sed_cmds = NULL; /* growable arrary holding a sequence of sed cmds */ 103static int ncmds = 0; /* number of sed commands */ 104 105/*static char *cur_file = NULL;*/ 106 107#ifdef BB_FEATURE_CLEAN_UP 108static void destroy_cmd_strs() 109{ 110 if (sed_cmds == NULL) 111 return; 112 113 /* destroy all the elements in the array */ 114 while (--ncmds >= 0) { 115 116 if (sed_cmds[ncmds].beg_match) { 117 regfree(sed_cmds[ncmds].beg_match); 118 free(sed_cmds[ncmds].beg_match); 119 } 120 if (sed_cmds[ncmds].end_match) { 121 regfree(sed_cmds[ncmds].end_match); 122 free(sed_cmds[ncmds].end_match); 123 } 124 if (sed_cmds[ncmds].sub_match) { 125 regfree(sed_cmds[ncmds].sub_match); 126 free(sed_cmds[ncmds].sub_match); 127 } 128 if (sed_cmds[ncmds].replace) 129 free(sed_cmds[ncmds].replace); 130 } 131 132 /* destroy the array */ 133 free(sed_cmds); 134 sed_cmds = NULL; 135} 136#endif 137 138 139/* 140 * index_of_next_unescaped_regexp_delim - walks left to right through a string 141 * beginning at a specified index and returns the index of the next regular 142 * expression delimiter (typically a forward * slash ('/')) not preceeded by 143 * a backslash ('\'). 144 */ 145static int index_of_next_unescaped_regexp_delim(struct sed_cmd *sed_cmd, const char *str, int idx) 146{ 147 for ( ; str[idx]; idx++) { 148 if (str[idx] == sed_cmd->delimiter && str[idx-1] != '\\') 149 return idx; 150 } 151 152 /* if we make it to here, we've hit the end of the string */ 153 return -1; 154} 155 156/* 157 * returns the index in the string just past where the address ends. 158 */ 159static int get_address(struct sed_cmd *sed_cmd, const char *str, int *linenum, regex_t **regex) 160{ 161 char *my_str = strdup(str); 162 int idx = 0; 163 char olddelimiter; 164 olddelimiter = sed_cmd->delimiter; 165 sed_cmd->delimiter = '/'; 166 167 if (isdigit(my_str[idx])) { 168 do { 169 idx++; 170 } while (isdigit(my_str[idx])); 171 my_str[idx] = 0; 172 *linenum = atoi(my_str); 173 } 174 else if (my_str[idx] == '$') { 175 *linenum = -1; 176 idx++; 177 } 178 else if (my_str[idx] == '/') { 179 idx = index_of_next_unescaped_regexp_delim(sed_cmd, my_str, ++idx); 180 if (idx == -1) 181 error_msg_and_die("unterminated match expression"); 182 my_str[idx] = '\0'; 183 *regex = (regex_t *)xmalloc(sizeof(regex_t)); 184 xregcomp(*regex, my_str+1, REG_NEWLINE); 185 idx++; /* so it points to the next character after the last '/' */ 186 } 187 else { 188 error_msg("get_address: no address found in string\n" 189 "\t(you probably didn't check the string you passed me)"); 190 idx = -1; 191 } 192 193 free(my_str); 194 sed_cmd->delimiter = olddelimiter; 195 return idx; 196} 197 198static int parse_subst_cmd(struct sed_cmd *sed_cmd, const char *substr) 199{ 200 int oldidx, cflags = REG_NEWLINE; 201 char *match; 202 int idx = 0; 203 int j; 204 205 /* 206 * the string that gets passed to this function should look like this: 207 * s/match/replace/gIp 208 * || | ||| 209 * mandatory optional 210 * 211 * (all three of the '/' slashes are mandatory) 212 */ 213 214 /* verify that the 's' is followed by something. That something 215 * (typically a 'slash') is now our regexp delimiter... */ 216 if (!substr[++idx]) 217 error_msg_and_die("bad format in substitution expression"); 218 else 219 sed_cmd->delimiter=substr[idx]; 220 221 /* save the match string */ 222 oldidx = idx+1; 223 idx = index_of_next_unescaped_regexp_delim(sed_cmd, substr, ++idx); 224 if (idx == -1) 225 error_msg_and_die("bad format in substitution expression"); 226 match = xstrndup(substr + oldidx, idx - oldidx); 227 228 /* determine the number of back references in the match string */ 229 /* Note: we compute this here rather than in the do_subst_command() 230 * function to save processor time, at the expense of a little more memory 231 * (4 bits) per sed_cmd */ 232 233 /* sed_cmd->num_backrefs = 0; */ 234 for (j = 0; match[j]; j++) { 235 /* GNU/POSIX sed does not save more than nine backrefs */ 236 if (match[j] == '\\' && match[j+1] == '(' && sed_cmd->num_backrefs <= 9) 237 sed_cmd->num_backrefs++; 238 } 239 240 /* save the replacement string */ 241 oldidx = idx+1; 242 idx = index_of_next_unescaped_regexp_delim(sed_cmd, substr, ++idx); 243 if (idx == -1) 244 error_msg_and_die("bad format in substitution expression"); 245 sed_cmd->replace = xstrndup(substr + oldidx, idx - oldidx); 246 247 /* process the flags */ 248 while (substr[++idx]) { 249 switch (substr[idx]) { 250 case 'g': 251 sed_cmd->sub_g = 1; 252 break; 253 case 'I': 254 cflags |= REG_ICASE; 255 break; 256 case 'p': 257 sed_cmd->sub_p = 1; 258 break; 259 default: 260 /* any whitespace or semicolon trailing after a s/// is ok */ 261 if (strchr("; \t\v\n\r", substr[idx])) 262 goto out; 263 /* else */ 264 error_msg_and_die("bad option in substitution expression"); 265 } 266 } 267 268out: 269 /* compile the match string into a regex */ 270 sed_cmd->sub_match = (regex_t *)xmalloc(sizeof(regex_t)); 271 xregcomp(sed_cmd->sub_match, match, cflags); 272 free(match); 273 274 return idx; 275} 276 277static int parse_edit_cmd(struct sed_cmd *sed_cmd, const char *editstr) 278{ 279 int idx = 0; 280 int slashes_eaten = 0; 281 char *ptr; /* shorthand */ 282 283 /* 284 * the string that gets passed to this function should look like this: 285 * 286 * need one of these 287 * | 288 * | this backslash (immediately following the edit command) is mandatory 289 * | | 290 * [aic]\ 291 * TEXT1\ 292 * TEXT2\ 293 * TEXTN 294 * 295 * as soon as we hit a TEXT line that has no trailing '\', we're done. 296 * this means a command like: 297 * 298 * i\ 299 * INSERTME 300 * 301 * is a-ok. 302 * 303 */ 304 305 if (editstr[1] != '\\' && (editstr[2] != '\n' || editstr[2] != '\r')) 306 error_msg_and_die("bad format in edit expression"); 307 308 /* store the edit line text */ 309 /* make editline big enough to accomodate the extra '\n' we will tack on 310 * to the end */ 311 sed_cmd->editline = xmalloc(strlen(&editstr[3]) + 2); 312 strcpy(sed_cmd->editline, &editstr[3]); 313 ptr = sed_cmd->editline; 314 315 /* now we need to go through * and: s/\\[\r\n]$/\n/g on the edit line */ 316 while (ptr[idx]) { 317 while (ptr[idx] != '\\' || (ptr[idx+1] != '\n' && ptr[idx+1] != '\r')) { 318 idx++; 319 if (!ptr[idx]) { 320 goto out; 321 } 322 } 323 /* move the newline over the '\' before it (effectively eats the '\') */ 324 memmove(&ptr[idx], &ptr[idx+1], strlen(&ptr[idx+1])); 325 ptr[strlen(ptr)-1] = 0; 326 slashes_eaten++; 327 /* substitue \r for \n if needed */ 328 if (ptr[idx] == '\r') 329 ptr[idx] = '\n'; 330 } 331 332out: 333 /* this accounts for discrepancies between the modified string and the 334 * original string passed in to this function */ 335 idx += slashes_eaten; 336 337 /* figure out if we need to add a newline */ 338 if (ptr[idx-1] != '\n') { 339 ptr[idx] = '\n'; 340 idx++; 341 } 342 343 /* terminate string */ 344 ptr[idx]= 0; 345 /* adjust for opening 2 chars [aic]\ */ 346 idx += 2; 347 348 return idx; 349} 350 351 352static int parse_file_cmd(struct sed_cmd *sed_cmd, const char *filecmdstr) 353{ 354 int idx = 0; 355 int filenamelen = 0; 356 357 /* 358 * the string that gets passed to this function should look like this: 359 * '[ ]filename' 360 * | | 361 * | a filename 362 * | 363 * optional whitespace 364 365 * re: the file to be read, the GNU manual says the following: "Note that 366 * if filename cannot be read, it is treated as if it were an empty file, 367 * without any error indication." Thus, all of the following commands are 368 * perfectly leagal: 369 * 370 * sed -e '1r noexist' 371 * sed -e '1r ;' 372 * sed -e '1r' 373 */ 374 375 /* the file command may be followed by whitespace; move past it. */ 376 while (isspace(filecmdstr[++idx])) 377 { ; } 378 379 /* the first non-whitespace we get is a filename. the filename ends when we 380 * hit a normal sed command terminator or end of string */ 381 filenamelen = strcspn(&filecmdstr[idx], "; \n\r\t\v\0"); 382 sed_cmd->filename = xmalloc(filenamelen + 1); 383 safe_strncpy(sed_cmd->filename, &filecmdstr[idx], filenamelen + 1); 384 385 return idx + filenamelen; 386} 387 388 389static char *parse_cmd_str(struct sed_cmd *sed_cmd, const char *cmdstr) 390{ 391 int idx = 0; 392 393 /* parse the command 394 * format is: [addr][,addr]cmd 395 * |----||-----||-| 396 * part1 part2 part3 397 */ 398 399 /* first part (if present) is an address: either a number or a /regex/ */ 400 if (isdigit(cmdstr[idx]) || cmdstr[idx] == '/') 401 idx = get_address(sed_cmd, cmdstr, &sed_cmd->beg_line, &sed_cmd->beg_match); 402 403 /* second part (if present) will begin with a comma */ 404 if (cmdstr[idx] == ',') 405 idx += get_address(sed_cmd, &cmdstr[++idx], &sed_cmd->end_line, &sed_cmd->end_match); 406 407 /* last part (mandatory) will be a command */ 408 if (cmdstr[idx] == '\0') 409 error_msg_and_die("missing command"); 410 sed_cmd->cmd = cmdstr[idx]; 411 412 /* if it was a single-letter command that takes no arguments (such as 'p' 413 * or 'd') all we need to do is increment the index past that command */ 414 if (strchr("pd", cmdstr[idx])) { 415 idx++; 416 } 417 /* handle (s)ubstitution command */ 418 else if (sed_cmd->cmd == 's') { 419 idx += parse_subst_cmd(sed_cmd, &cmdstr[idx]); 420 } 421 /* handle edit cmds: (a)ppend, (i)nsert, and (c)hange */ 422 else if (strchr("aic", sed_cmd->cmd)) { 423 if ((sed_cmd->end_line || sed_cmd->end_match) && sed_cmd->cmd != 'c') 424 error_msg_and_die("only a beginning address can be specified for edit commands"); 425 idx += parse_edit_cmd(sed_cmd, &cmdstr[idx]); 426 } 427 /* handle file cmds: (r)ead */ 428 else if (sed_cmd->cmd == 'r') { 429 if (sed_cmd->end_line || sed_cmd->end_match) 430 error_msg_and_die("Command only uses one address"); 431 idx += parse_file_cmd(sed_cmd, &cmdstr[idx]); 432 } 433 else { 434 error_msg_and_die("invalid command"); 435 } 436 437 /* give back whatever's left over */ 438 return (char *)&cmdstr[idx]; 439} 440 441static void add_cmd_str(const char *cmdstr) 442{ 443 char *mystr = (char *)cmdstr; 444 445 do { 446 447 /* trim leading whitespace and semicolons */ 448 memmove(mystr, &mystr[strspn(mystr, "; \n\r\t\v")], strlen(mystr)); 449 /* if we ate the whole thing, that means there was just trailing 450 * whitespace or a final / no-op semicolon. either way, get out */ 451 if (strlen(mystr) == 0) 452 return; 453 /* if this is a comment, jump past it and keep going */ 454 if (mystr[0] == '#') { 455 mystr = strpbrk(mystr, ";\n\r"); 456 continue; 457 } 458 /* grow the array */ 459 sed_cmds = xrealloc(sed_cmds, sizeof(struct sed_cmd) * (++ncmds)); 460 /* zero new element */ 461 memset(&sed_cmds[ncmds-1], 0, sizeof(struct sed_cmd)); 462 /* load command string into new array element, get remainder */ 463 mystr = parse_cmd_str(&sed_cmds[ncmds-1], mystr); 464 465 } while (mystr && strlen(mystr)); 466} 467 468 469static void load_cmd_file(char *filename) 470{ 471 FILE *cmdfile; 472 char *line; 473 char *nextline; 474 475 cmdfile = xfopen(filename, "r"); 476 477 while ((line = get_line_from_file(cmdfile)) != NULL) { 478 /* if a line ends with '\' it needs the next line appended to it */ 479 while (line[strlen(line)-2] == '\\' && 480 (nextline = get_line_from_file(cmdfile)) != NULL) { 481 line = xrealloc(line, strlen(line) + strlen(nextline) + 1); 482 strcat(line, nextline); 483 free(nextline); 484 } 485 /* eat trailing newline (if any) --if I don't do this, edit commands 486 * (aic) will print an extra newline */ 487 chomp(line); 488 add_cmd_str(line); 489 free(line); 490 } 491} 492 493static void print_subst_w_backrefs(const char *line, const char *replace, regmatch_t *regmatch) 494{ 495 int i; 496 497 /* go through the replacement string */ 498 for (i = 0; replace[i]; i++) { 499 /* if we find a backreference (\1, \2, etc.) print the backref'ed * text */ 500 if (replace[i] == '\\' && isdigit(replace[i+1])) { 501 int j; 502 char tmpstr[2]; 503 int backref; 504 ++i; /* i now indexes the backref number, instead of the leading slash */ 505 tmpstr[0] = replace[i]; 506 tmpstr[1] = 0; 507 backref = atoi(tmpstr); 508 /* print out the text held in regmatch[backref] */ 509 for (j = regmatch[backref].rm_so; j < regmatch[backref].rm_eo; j++) 510 fputc(line[j], stdout); 511 } 512 513 /* if we find a backslash escaped character, print the character */ 514 else if (replace[i] == '\\') { 515 ++i; 516 fputc(replace[i], stdout); 517 } 518 519 /* if we find an unescaped '&' print out the whole matched text. 520 * fortunately, regmatch[0] contains the indicies to the whole matched 521 * expression (kinda seems like it was designed for just such a 522 * purpose...) */ 523 else if (replace[i] == '&' && replace[i-1] != '\\') { 524 int j; 525 for (j = regmatch[0].rm_so; j < regmatch[0].rm_eo; j++) 526 fputc(line[j], stdout); 527 } 528 /* nothing special, just print this char of the replacement string to stdout */ 529 else 530 fputc(replace[i], stdout); 531 } 532} 533 534static int do_subst_command(const struct sed_cmd *sed_cmd, const char *line) 535{ 536 char *hackline = (char *)line; 537 int altered = 0; 538 regmatch_t *regmatch = NULL; 539 540 /* we only proceed if the substitution 'search' expression matches */ 541 if (regexec(sed_cmd->sub_match, line, 0, NULL, 0) == REG_NOMATCH) 542 return 0; 543 544 /* whaddaya know, it matched. get the number of back references */ 545 regmatch = xmalloc(sizeof(regmatch_t) * (sed_cmd->num_backrefs+1)); 546 547 /* and now, as long as we've got a line to try matching and if we can match 548 * the search string, we make substitutions */ 549 while (*hackline && (regexec(sed_cmd->sub_match, hackline, 550 sed_cmd->num_backrefs+1, regmatch, 0) == 0) ) { 551 int i; 552 553 /* print everything before the match */ 554 for (i = 0; i < regmatch[0].rm_so; i++) 555 fputc(hackline[i], stdout); 556 557 /* then print the substitution string */ 558 print_subst_w_backrefs(hackline, sed_cmd->replace, regmatch); 559 560 /* advance past the match */ 561 hackline += regmatch[0].rm_eo; 562 /* flag that something has changed */ 563 altered++; 564 565 /* if we're not doing this globally, get out now */ 566 if (!sed_cmd->sub_g) 567 break; 568 } 569 570 puts(hackline); 571 572 /* cleanup */ 573 free(regmatch); 574 575 return altered; 576} 577 578 579static void process_file(FILE *file) 580{ 581 char *line = NULL; 582 static int linenum = 0; /* GNU sed does not restart counting lines at EOF */ 583 unsigned int still_in_range = 0; 584 int altered; 585 int i; 586 587 /* go through every line in the file */ 588 while ((line = get_line_from_file(file)) != NULL) { 589 590 chomp(line); 591 linenum++; 592 altered = 0; 593 594 /* for every line, go through all the commands */ 595 for (i = 0; i < ncmds; i++) { 596 597 598 /* 599 * entry point into sedding... 600 */ 601 if ( 602 /* no range necessary */ 603 (sed_cmds[i].beg_line == 0 && sed_cmds[i].end_line == 0 && 604 sed_cmds[i].beg_match == NULL && 605 sed_cmds[i].end_match == NULL) || 606 /* this line number is the first address we're looking for */ 607 (sed_cmds[i].beg_line && (sed_cmds[i].beg_line == linenum)) || 608 /* this line matches our first address regex */ 609 (sed_cmds[i].beg_match && (regexec(sed_cmds[i].beg_match, line, 0, NULL, 0) == 0)) || 610 /* we are currently within the beginning & ending address range */ 611 still_in_range 612 ) { 613 614 /* 615 * actual sedding 616 */ 617 switch (sed_cmds[i].cmd) { 618 619 case 'p': 620 puts(line); 621 break; 622 623 case 'd': 624 altered++; 625 break; 626 627 case 's': 628 629 /* 630 * Some special cases for 's' printing to make it compliant with 631 * GNU sed printing behavior (aka "The -n | s///p Matrix"): 632 * 633 * -n ONLY = never print anything regardless of any successful 634 * substitution 635 * 636 * s///p ONLY = always print successful substitutions, even if 637 * the line is going to be printed anyway (line will be printed 638 * twice). 639 * 640 * -n AND s///p = print ONLY a successful substitution ONE TIME; 641 * no other lines are printed - this is the reason why the 'p' 642 * flag exists in the first place. 643 */ 644 645 /* if the user specified that they didn't want anything printed (i.e., a -n 646 * flag and no 'p' flag after the s///), then there's really no point doing 647 * anything here. */ 648 if (be_quiet && !sed_cmds[i].sub_p) 649 break; 650 651 /* we print the line once, unless we were told to be quiet */ 652 if (!be_quiet) 653 altered |= do_subst_command(&sed_cmds[i], line); 654 655 /* we also print the line if we were given the 'p' flag 656 * (this is quite possibly the second printing) */ 657 if (sed_cmds[i].sub_p) 658 altered |= do_subst_command(&sed_cmds[i], line); 659 660 break; 661 662 case 'a': 663 puts(line); 664 fputs(sed_cmds[i].editline, stdout); 665 altered++; 666 break; 667 668 case 'i': 669 fputs(sed_cmds[i].editline, stdout); 670 break; 671 672 case 'c': 673 /* single-address case */ 674 if (sed_cmds[i].end_match == NULL && sed_cmds[i].end_line == 0) { 675 fputs(sed_cmds[i].editline, stdout); 676 } 677 /* multi-address case */ 678 else { 679 /* matching text */ 680 if (sed_cmds[i].end_match && (regexec(sed_cmds[i].end_match, line, 0, NULL, 0) == 0)) 681 fputs(sed_cmds[i].editline, stdout); 682 /* matching line numbers */ 683 if (sed_cmds[i].end_line > 0 && sed_cmds[i].end_line == linenum) 684 fputs(sed_cmds[i].editline, stdout); 685 } 686 altered++; 687 688 break; 689 690 case 'r': { 691 FILE *outfile; 692 puts(line); 693 outfile = fopen(sed_cmds[i].filename, "r"); 694 if (outfile) 695 print_file(outfile); 696 /* else if we couldn't open the output file, 697 * no biggie, just don't print anything */ 698 altered++; 699 } 700 break; 701 } 702 703 /* 704 * exit point from sedding... 705 */ 706 if ( 707 /* this is a single-address command or... */ 708 (sed_cmds[i].end_line == 0 && sed_cmds[i].end_match == NULL) || ( 709 /* we were in the middle of our address range (this 710 * isn't the first time through) and.. */ 711 (still_in_range == 1) && ( 712 /* this line number is the last address we're looking for or... */ 713 (sed_cmds[i].end_line && (sed_cmds[i].end_line == linenum)) || 714 /* this line matches our last address regex */ 715 (sed_cmds[i].end_match && (regexec(sed_cmds[i].end_match, line, 0, NULL, 0) == 0)) 716 ) 717 ) 718 ) { 719 /* we're out of our address range */ 720 still_in_range = 0; 721 } 722 723 /* didn't hit the exit? then we're still in the middle of an address range */ 724 else { 725 still_in_range = 1; 726 } 727 } 728 } 729 730 /* we will print the line unless we were told to be quiet or if the 731 * line was altered (via a 'd'elete or 's'ubstitution), in which case 732 * the altered line was already printed */ 733 if (!be_quiet && !altered) 734 puts(line); 735 736 free(line); 737 } 738} 739 740extern int sed_main(int argc, char **argv) 741{ 742 int opt; 743 744#ifdef BB_FEATURE_CLEAN_UP 745 /* destroy command strings on exit */ 746 if (atexit(destroy_cmd_strs) == -1) 747 perror_msg_and_die("atexit"); 748#endif 749 750 /* do normal option parsing */ 751 while ((opt = getopt(argc, argv, "ne:f:")) > 0) { 752 switch (opt) { 753 case 'n': 754 be_quiet++; 755 break; 756 case 'e': 757 add_cmd_str(optarg); 758 break; 759 case 'f': 760 load_cmd_file(optarg); 761 break; 762 default: 763 show_usage(); 764 } 765 } 766 767 /* if we didn't get a pattern from a -e and no command file was specified, 768 * argv[optind] should be the pattern. no pattern, no worky */ 769 if (ncmds == 0) { 770 if (argv[optind] == NULL) 771 show_usage(); 772 else { 773 add_cmd_str(argv[optind]); 774 optind++; 775 } 776 } 777 778 779 /* argv[(optind)..(argc-1)] should be names of file to process. If no 780 * files were specified or '-' was specified, take input from stdin. 781 * Otherwise, we process all the files specified. */ 782 if (argv[optind] == NULL || (strcmp(argv[optind], "-") == 0)) { 783 process_file(stdin); 784 } 785 else { 786 int i; 787 FILE *file; 788 for (i = optind; i < argc; i++) { 789 file = fopen(argv[i], "r"); 790 if (file == NULL) { 791 perror_msg("%s", argv[i]); 792 } else { 793 process_file(file); 794 fclose(file); 795 } 796 } 797 } 798 799 return 0; 800} 801