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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 | /* vi: set sw=4 ts=4: */ /* * Mini grep implementation for busybox using libc regex. * * Copyright (C) 1999,2000,2001 by Lineo, inc. and Mark Whitley * Copyright (C) 1999,2000,2001 by Mark Whitley <markw@codepoet.org> * * Licensed under the GPL v2 or later, see the file LICENSE in this tarball. */ /* BB_AUDIT SUSv3 defects - unsupported option -x "match whole line only". */ /* BB_AUDIT GNU defects - always acts as -a. */ /* http://www.opengroup.org/onlinepubs/007904975/utilities/grep.html */ /* * 2004,2006 (C) Vladimir Oleynik <dzo@simtreas.ru> - * correction "-e pattern1 -e pattern2" logic and more optimizations. * precompiled regex */ /* * (C) 2006 Jac Goudsmit added -o option */ #include "libbb.h" #include "xregex.h" /* options */ #define OPTSTR_GREP \ "lnqvscFiHhe:f:Lorm:" \ USE_FEATURE_GREP_CONTEXT("A:B:C:") \ USE_FEATURE_GREP_EGREP_ALIAS("E") \ USE_DESKTOP("w") \ "aI" /* ignored: -a "assume all files to be text" */ /* ignored: -I "assume binary files have no matches" */ enum { OPTBIT_l, /* list matched file names only */ OPTBIT_n, /* print line# */ OPTBIT_q, /* quiet - exit(EXIT_SUCCESS) of first match */ OPTBIT_v, /* invert the match, to select non-matching lines */ OPTBIT_s, /* suppress errors about file open errors */ OPTBIT_c, /* count matches per file (suppresses normal output) */ OPTBIT_F, /* literal match */ OPTBIT_i, /* case-insensitive */ OPTBIT_H, /* force filename display */ OPTBIT_h, /* inhibit filename display */ OPTBIT_e, /* -e PATTERN */ OPTBIT_f, /* -f FILE_WITH_PATTERNS */ OPTBIT_L, /* list unmatched file names only */ OPTBIT_o, /* show only matching parts of lines */ OPTBIT_r, /* recurse dirs */ OPTBIT_m, /* -m MAX_MATCHES */ USE_FEATURE_GREP_CONTEXT( OPTBIT_A ,) /* -A NUM: after-match context */ USE_FEATURE_GREP_CONTEXT( OPTBIT_B ,) /* -B NUM: before-match context */ USE_FEATURE_GREP_CONTEXT( OPTBIT_C ,) /* -C NUM: -A and -B combined */ USE_FEATURE_GREP_EGREP_ALIAS(OPTBIT_E ,) /* extended regexp */ USE_DESKTOP( OPTBIT_w ,) /* whole word match */ OPT_l = 1 << OPTBIT_l, OPT_n = 1 << OPTBIT_n, OPT_q = 1 << OPTBIT_q, OPT_v = 1 << OPTBIT_v, OPT_s = 1 << OPTBIT_s, OPT_c = 1 << OPTBIT_c, OPT_F = 1 << OPTBIT_F, OPT_i = 1 << OPTBIT_i, OPT_H = 1 << OPTBIT_H, OPT_h = 1 << OPTBIT_h, OPT_e = 1 << OPTBIT_e, OPT_f = 1 << OPTBIT_f, OPT_L = 1 << OPTBIT_L, OPT_o = 1 << OPTBIT_o, OPT_r = 1 << OPTBIT_r, OPT_m = 1 << OPTBIT_m, OPT_A = USE_FEATURE_GREP_CONTEXT( (1 << OPTBIT_A)) + 0, OPT_B = USE_FEATURE_GREP_CONTEXT( (1 << OPTBIT_B)) + 0, OPT_C = USE_FEATURE_GREP_CONTEXT( (1 << OPTBIT_C)) + 0, OPT_E = USE_FEATURE_GREP_EGREP_ALIAS((1 << OPTBIT_E)) + 0, OPT_w = USE_DESKTOP( (1 << OPTBIT_w)) + 0, }; #define PRINT_FILES_WITH_MATCHES (option_mask32 & OPT_l) #define PRINT_LINE_NUM (option_mask32 & OPT_n) #define BE_QUIET (option_mask32 & OPT_q) #define SUPPRESS_ERR_MSGS (option_mask32 & OPT_s) #define PRINT_MATCH_COUNTS (option_mask32 & OPT_c) #define FGREP_FLAG (option_mask32 & OPT_F) #define PRINT_FILES_WITHOUT_MATCHES (option_mask32 & OPT_L) struct globals { int max_matches; #if !ENABLE_EXTRA_COMPAT int reflags; #else RE_TRANSLATE_TYPE case_fold; /* RE_TRANSLATE_TYPE is [[un]signed] char* */ #endif smalluint invert_search; smalluint print_filename; smalluint open_errors; #if ENABLE_FEATURE_GREP_CONTEXT smalluint did_print_line; int lines_before; int lines_after; char **before_buf; USE_EXTRA_COMPAT(size_t *before_buf_size;) int last_line_printed; #endif /* globals used internally */ llist_t *pattern_head; /* growable list of patterns to match */ const char *cur_file; /* the current file we are reading */ }; #define G (*(struct globals*)&bb_common_bufsiz1) #define INIT_G() do { \ struct G_sizecheck { \ char G_sizecheck[sizeof(G) > COMMON_BUFSIZE ? -1 : 1]; \ }; \ } while (0) #define max_matches (G.max_matches ) #if !ENABLE_EXTRA_COMPAT #define reflags (G.reflags ) #else #define case_fold (G.case_fold ) /* http://www.delorie.com/gnu/docs/regex/regex_46.html */ #define reflags re_syntax_options #undef REG_NOSUB #undef REG_EXTENDED #undef REG_ICASE #define REG_NOSUB bug:is:here /* should not be used */ #define REG_EXTENDED RE_SYNTAX_EGREP #define REG_ICASE bug:is:here /* should not be used */ #endif #define invert_search (G.invert_search ) #define print_filename (G.print_filename ) #define open_errors (G.open_errors ) #define did_print_line (G.did_print_line ) #define lines_before (G.lines_before ) #define lines_after (G.lines_after ) #define before_buf (G.before_buf ) #define before_buf_size (G.before_buf_size ) #define last_line_printed (G.last_line_printed ) #define pattern_head (G.pattern_head ) #define cur_file (G.cur_file ) typedef struct grep_list_data_t { char *pattern; /* for GNU regex, matched_range must be persistent across grep_file() calls */ #if !ENABLE_EXTRA_COMPAT regex_t compiled_regex; regmatch_t matched_range; #else struct re_pattern_buffer compiled_regex; struct re_registers matched_range; #endif #define ALLOCATED 1 #define COMPILED 2 int flg_mem_alocated_compiled; } grep_list_data_t; #if !ENABLE_EXTRA_COMPAT #define print_line(line, line_len, linenum, decoration) \ print_line(line, linenum, decoration) #endif static void print_line(const char *line, size_t line_len, int linenum, char decoration) { #if ENABLE_FEATURE_GREP_CONTEXT /* Happens when we go to next file, immediately hit match * and try to print prev context... from prev file! Don't do it */ if (linenum < 1) return; /* possibly print the little '--' separator */ if ((lines_before || lines_after) && did_print_line && last_line_printed != linenum - 1 ) { puts("--"); } /* guard against printing "--" before first line of first file */ did_print_line = 1; last_line_printed = linenum; #endif if (print_filename) printf("%s%c", cur_file, decoration); if (PRINT_LINE_NUM) printf("%i%c", linenum, decoration); /* Emulate weird GNU grep behavior with -ov */ if ((option_mask32 & (OPT_v|OPT_o)) != (OPT_v|OPT_o)) { #if !ENABLE_EXTRA_COMPAT puts(line); #else fwrite(line, 1, line_len, stdout); putchar('\n'); #endif } } #if ENABLE_EXTRA_COMPAT /* Unlike getline, this one removes trailing '\n' */ static ssize_t FAST_FUNC bb_getline(char **line_ptr, size_t *line_alloc_len, FILE *file) { ssize_t res_sz; char *line; res_sz = getline(line_ptr, line_alloc_len, file); line = *line_ptr; if (res_sz > 0) { if (line[res_sz - 1] == '\n') line[--res_sz] = '\0'; } else { free(line); /* uclibc allocates a buffer even on EOF. WTF? */ } return res_sz; } #endif static int grep_file(FILE *file) { smalluint found; int linenum = 0; int nmatches = 0; #if !ENABLE_EXTRA_COMPAT char *line; #else char *line = NULL; ssize_t line_len; size_t line_alloc_len; #define rm_so start[0] #define rm_eo end[0] #endif #if ENABLE_FEATURE_GREP_CONTEXT int print_n_lines_after = 0; int curpos = 0; /* track where we are in the circular 'before' buffer */ int idx = 0; /* used for iteration through the circular buffer */ #else enum { print_n_lines_after = 0 }; #endif /* ENABLE_FEATURE_GREP_CONTEXT */ while ( #if !ENABLE_EXTRA_COMPAT (line = xmalloc_fgetline(file)) != NULL #else (line_len = bb_getline(&line, &line_alloc_len, file)) >= 0 #endif ) { llist_t *pattern_ptr = pattern_head; grep_list_data_t *gl = gl; /* for gcc */ linenum++; found = 0; while (pattern_ptr) { gl = (grep_list_data_t *)pattern_ptr->data; if (FGREP_FLAG) { found |= (strstr(line, gl->pattern) != NULL); } else { if (!(gl->flg_mem_alocated_compiled & COMPILED)) { gl->flg_mem_alocated_compiled |= COMPILED; #if !ENABLE_EXTRA_COMPAT xregcomp(&gl->compiled_regex, gl->pattern, reflags); #else memset(&gl->compiled_regex, 0, sizeof(gl->compiled_regex)); gl->compiled_regex.translate = case_fold; /* for -i */ if (re_compile_pattern(gl->pattern, strlen(gl->pattern), &gl->compiled_regex)) bb_error_msg_and_die("bad regex '%s'", gl->pattern); #endif } #if !ENABLE_EXTRA_COMPAT gl->matched_range.rm_so = 0; gl->matched_range.rm_eo = 0; #endif if ( #if !ENABLE_EXTRA_COMPAT regexec(&gl->compiled_regex, line, 1, &gl->matched_range, 0) == 0 #else re_search(&gl->compiled_regex, line, line_len, /*start:*/ 0, /*range:*/ line_len, &gl->matched_range) >= 0 #endif ) { if (!(option_mask32 & OPT_w)) found = 1; else { char c = ' '; if (gl->matched_range.rm_so) c = line[gl->matched_range.rm_so - 1]; if (!isalnum(c) && c != '_') { c = line[gl->matched_range.rm_eo]; if (!c || (!isalnum(c) && c != '_')) found = 1; } } } } /* If it's non-inverted search, we can stop * at first match */ if (found && !invert_search) goto do_found; pattern_ptr = pattern_ptr->link; } /* while (pattern_ptr) */ if (found ^ invert_search) { do_found: /* keep track of matches */ nmatches++; /* quiet/print (non)matching file names only? */ if (option_mask32 & (OPT_q|OPT_l|OPT_L)) { free(line); /* we don't need line anymore */ if (BE_QUIET) { /* manpage says about -q: * "exit immediately with zero status * if any match is found, * even if errors were detected" */ exit(EXIT_SUCCESS); } /* if we're just printing filenames, we stop after the first match */ if (PRINT_FILES_WITH_MATCHES) { puts(cur_file); /* fall through to "return 1" */ } /* OPT_L aka PRINT_FILES_WITHOUT_MATCHES: return early */ return 1; /* one match */ } #if ENABLE_FEATURE_GREP_CONTEXT /* Were we printing context and saw next (unwanted) match? */ if ((option_mask32 & OPT_m) && nmatches > max_matches) break; #endif /* print the matched line */ if (PRINT_MATCH_COUNTS == 0) { #if ENABLE_FEATURE_GREP_CONTEXT int prevpos = (curpos == 0) ? lines_before - 1 : curpos - 1; /* if we were told to print 'before' lines and there is at least * one line in the circular buffer, print them */ if (lines_before && before_buf[prevpos] != NULL) { int first_buf_entry_line_num = linenum - lines_before; /* advance to the first entry in the circular buffer, and * figure out the line number is of the first line in the * buffer */ idx = curpos; while (before_buf[idx] == NULL) { idx = (idx + 1) % lines_before; first_buf_entry_line_num++; } /* now print each line in the buffer, clearing them as we go */ while (before_buf[idx] != NULL) { print_line(before_buf[idx], before_buf_size[idx], first_buf_entry_line_num, '-'); free(before_buf[idx]); before_buf[idx] = NULL; idx = (idx + 1) % lines_before; first_buf_entry_line_num++; } } /* make a note that we need to print 'after' lines */ print_n_lines_after = lines_after; #endif if (option_mask32 & OPT_o) { if (FGREP_FLAG) { /* -Fo just prints the pattern * (unless -v: -Fov doesnt print anything at all) */ if (found) print_line(gl->pattern, strlen(gl->pattern), linenum, ':'); } else while (1) { char old = line[gl->matched_range.rm_eo]; line[gl->matched_range.rm_eo] = '\0'; print_line(line + gl->matched_range.rm_so, gl->matched_range.rm_eo - gl->matched_range.rm_so, linenum, ':'); line[gl->matched_range.rm_eo] = old; #if !ENABLE_EXTRA_COMPAT break; #else if (re_search(&gl->compiled_regex, line, line_len, gl->matched_range.rm_eo, line_len - gl->matched_range.rm_eo, &gl->matched_range) < 0) break; #endif } } else { print_line(line, line_len, linenum, ':'); } } } #if ENABLE_FEATURE_GREP_CONTEXT else { /* no match */ /* if we need to print some context lines after the last match, do so */ if (print_n_lines_after) { print_line(line, strlen(line), linenum, '-'); print_n_lines_after--; } else if (lines_before) { /* Add the line to the circular 'before' buffer */ free(before_buf[curpos]); before_buf[curpos] = line; USE_EXTRA_COMPAT(before_buf_size[curpos] = line_len;) curpos = (curpos + 1) % lines_before; /* avoid free(line) - we took the line */ line = NULL; } } #endif /* ENABLE_FEATURE_GREP_CONTEXT */ #if !ENABLE_EXTRA_COMPAT free(line); #endif /* Did we print all context after last requested match? */ if ((option_mask32 & OPT_m) && !print_n_lines_after && nmatches == max_matches) break; } /* while (read line) */ /* special-case file post-processing for options where we don't print line * matches, just filenames and possibly match counts */ /* grep -c: print [filename:]count, even if count is zero */ if (PRINT_MATCH_COUNTS) { if (print_filename) printf("%s:", cur_file); printf("%d\n", nmatches); } /* grep -L: print just the filename */ if (PRINT_FILES_WITHOUT_MATCHES) { /* nmatches is zero, no need to check it: * we return 1 early if we detected a match * and PRINT_FILES_WITHOUT_MATCHES is set */ puts(cur_file); } return nmatches; } #if ENABLE_FEATURE_CLEAN_UP #define new_grep_list_data(p, m) add_grep_list_data(p, m) static char *add_grep_list_data(char *pattern, int flg_used_mem) #else #define new_grep_list_data(p, m) add_grep_list_data(p) static char *add_grep_list_data(char *pattern) #endif { grep_list_data_t *gl = xzalloc(sizeof(*gl)); gl->pattern = pattern; #if ENABLE_FEATURE_CLEAN_UP gl->flg_mem_alocated_compiled = flg_used_mem; #else /*gl->flg_mem_alocated_compiled = 0;*/ #endif return (char *)gl; } static void load_regexes_from_file(llist_t *fopt) { char *line; FILE *f; while (fopt) { llist_t *cur = fopt; char *ffile = cur->data; fopt = cur->link; free(cur); f = xfopen_stdin(ffile); while ((line = xmalloc_fgetline(f)) != NULL) { llist_add_to(&pattern_head, new_grep_list_data(line, ALLOCATED)); } } } static int FAST_FUNC file_action_grep(const char *filename, struct stat *statbuf UNUSED_PARAM, void* matched, int depth UNUSED_PARAM) { FILE *file = fopen_for_read(filename); if (file == NULL) { if (!SUPPRESS_ERR_MSGS) bb_simple_perror_msg(filename); open_errors = 1; return 0; } cur_file = filename; *(int*)matched += grep_file(file); fclose(file); return 1; } static int grep_dir(const char *dir) { int matched = 0; recursive_action(dir, /* recurse=yes */ ACTION_RECURSE | /* followLinks=no */ /* depthFirst=yes */ ACTION_DEPTHFIRST, /* fileAction= */ file_action_grep, /* dirAction= */ NULL, /* userData= */ &matched, /* depth= */ 0); return matched; } int grep_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; int grep_main(int argc, char **argv) { FILE *file; int matched; llist_t *fopt = NULL; /* do normal option parsing */ #if ENABLE_FEATURE_GREP_CONTEXT int Copt; /* -H unsets -h; -C unsets -A,-B; -e,-f are lists; * -m,-A,-B,-C have numeric param */ opt_complementary = "H-h:C-AB:e::f::m+:A+:B+:C+"; getopt32(argv, OPTSTR_GREP, &pattern_head, &fopt, &max_matches, &lines_after, &lines_before, &Copt); if (option_mask32 & OPT_C) { /* -C unsets prev -A and -B, but following -A or -B may override it */ if (!(option_mask32 & OPT_A)) /* not overridden */ lines_after = Copt; if (!(option_mask32 & OPT_B)) /* not overridden */ lines_before = Copt; } /* sanity checks */ if (option_mask32 & (OPT_c|OPT_q|OPT_l|OPT_L)) { option_mask32 &= ~OPT_n; lines_before = 0; lines_after = 0; } else if (lines_before > 0) { before_buf = xzalloc(lines_before * sizeof(before_buf[0])); USE_EXTRA_COMPAT(before_buf_size = xzalloc(lines_before * sizeof(before_buf_size[0]));) } #else /* with auto sanity checks */ /* -H unsets -h; -c,-q or -l unset -n; -e,-f are lists; -m N */ opt_complementary = "H-h:c-n:q-n:l-n:e::f::m+"; getopt32(argv, OPTSTR_GREP, &pattern_head, &fopt, &max_matches); #endif invert_search = ((option_mask32 & OPT_v) != 0); /* 0 | 1 */ if (pattern_head != NULL) { /* convert char **argv to grep_list_data_t */ llist_t *cur; for (cur = pattern_head; cur; cur = cur->link) cur->data = new_grep_list_data(cur->data, 0); } if (option_mask32 & OPT_f) load_regexes_from_file(fopt); if (ENABLE_FEATURE_GREP_FGREP_ALIAS && applet_name[0] == 'f') option_mask32 |= OPT_F; #if !ENABLE_EXTRA_COMPAT if (!(option_mask32 & (OPT_o | OPT_w))) reflags = REG_NOSUB; #endif if (ENABLE_FEATURE_GREP_EGREP_ALIAS && (applet_name[0] == 'e' || (option_mask32 & OPT_E)) ) { reflags |= REG_EXTENDED; } #if ENABLE_EXTRA_COMPAT else { reflags = RE_SYNTAX_GREP; } #endif if (option_mask32 & OPT_i) { #if !ENABLE_EXTRA_COMPAT reflags |= REG_ICASE; #else int i; case_fold = xmalloc(256); for (i = 0; i < 256; i++) case_fold[i] = (unsigned char)i; for (i = 'a'; i <= 'z'; i++) case_fold[i] = (unsigned char)(i - ('a' - 'A')); #endif } argv += optind; argc -= optind; /* if we didn't get a pattern from -e and no command file was specified, * first parameter should be the pattern. no pattern, no worky */ if (pattern_head == NULL) { char *pattern; if (*argv == NULL) bb_show_usage(); pattern = new_grep_list_data(*argv++, 0); llist_add_to(&pattern_head, pattern); argc--; } /* argv[0..(argc-1)] should be names of file to grep through. If * there is more than one file to grep, we will print the filenames. */ if (argc > 1) print_filename = 1; /* -H / -h of course override */ if (option_mask32 & OPT_H) print_filename = 1; if (option_mask32 & OPT_h) print_filename = 0; /* If no files were specified, or '-' was specified, take input from * stdin. Otherwise, we grep through all the files specified. */ matched = 0; do { cur_file = *argv++; file = stdin; if (!cur_file || LONE_DASH(cur_file)) { cur_file = "(standard input)"; } else { if (option_mask32 & OPT_r) { struct stat st; if (stat(cur_file, &st) == 0 && S_ISDIR(st.st_mode)) { if (!(option_mask32 & OPT_h)) print_filename = 1; matched += grep_dir(cur_file); goto grep_done; } } /* else: fopen(dir) will succeed, but reading won't */ file = fopen_for_read(cur_file); if (file == NULL) { if (!SUPPRESS_ERR_MSGS) bb_simple_perror_msg(cur_file); open_errors = 1; continue; } } matched += grep_file(file); fclose_if_not_stdin(file); grep_done: ; } while (--argc > 0); /* destroy all the elments in the pattern list */ if (ENABLE_FEATURE_CLEAN_UP) { while (pattern_head) { llist_t *pattern_head_ptr = pattern_head; grep_list_data_t *gl = (grep_list_data_t *)pattern_head_ptr->data; pattern_head = pattern_head->link; if (gl->flg_mem_alocated_compiled & ALLOCATED) free(gl->pattern); if (gl->flg_mem_alocated_compiled & COMPILED) regfree(&gl->compiled_regex); free(gl); free(pattern_head_ptr); } } /* 0 = success, 1 = failed, 2 = error */ if (open_errors) return 2; return !matched; /* invert return value: 0 = success, 1 = failed */ } |