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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 | /* 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. */ /* 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 "busybox.h" #include "xregex.h" /* options */ #define GREP_OPTS "lnqvscFiHhe:f:Lor" #define GREP_OPT_l (1<<0) #define PRINT_FILES_WITH_MATCHES (option_mask32 & GREP_OPT_l) #define GREP_OPT_n (1<<1) #define PRINT_LINE_NUM (option_mask32 & GREP_OPT_n) #define GREP_OPT_q (1<<2) #define BE_QUIET (option_mask32 & GREP_OPT_q) #define GREP_OPT_v (1<<3) #define GREP_OPT_s (1<<4) #define SUPPRESS_ERR_MSGS (option_mask32 & GREP_OPT_s) #define GREP_OPT_c (1<<5) #define PRINT_MATCH_COUNTS (option_mask32 & GREP_OPT_c) #define GREP_OPT_F (1<<6) #define FGREP_FLAG (option_mask32 & GREP_OPT_F) #define GREP_OPT_i (1<<7) #define GREP_OPT_H (1<<8) #define GREP_OPT_h (1<<9) #define GREP_OPT_e (1<<10) #define GREP_OPT_f (1<<11) #define GREP_OPT_L (1<<12) #define PRINT_FILES_WITHOUT_MATCHES (option_mask32 & GREP_OPT_L) #define GREP_OPT_o (1<<13) #define GREP_OPT_r (1<<14) #if ENABLE_FEATURE_GREP_CONTEXT # define GREP_OPT_CONTEXT "A:B:C:" # define GREP_OPT_A (1<<15) # define GREP_OPT_B (1<<16) # define GREP_OPT_C (1<<17) # define GREP_OPT_E (1<<18) #else # define GREP_OPT_CONTEXT "" # define GREP_OPT_A 0 # define GREP_OPT_B 0 # define GREP_OPT_C 0 # define GREP_OPT_E (1<<15) #endif #if ENABLE_FEATURE_GREP_EGREP_ALIAS # define OPT_EGREP "E" #else # define OPT_EGREP "" #endif typedef unsigned char byte_t; static int reflags; static byte_t invert_search; static byte_t print_filename; static byte_t open_errors; #if ENABLE_FEATURE_GREP_CONTEXT static int lines_before; static int lines_after; static char **before_buf; static int last_line_printed; #endif /* ENABLE_FEATURE_GREP_CONTEXT */ /* globals used internally */ static llist_t *pattern_head; /* growable list of patterns to match */ static const char *cur_file; /* the current file we are reading */ typedef struct GREP_LIST_DATA { char *pattern; regex_t preg; #define PATTERN_MEM_A 1 #define COMPILED 2 int flg_mem_alocated_compiled; } grep_list_data_t; static void print_line(const char *line, int linenum, char decoration) { #if ENABLE_FEATURE_GREP_CONTEXT /* possibly print the little '--' separator */ if ((lines_before || lines_after) && last_line_printed && last_line_printed < linenum - 1) { puts("--"); } 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 & (GREP_OPT_v+GREP_OPT_o)) != (GREP_OPT_v+GREP_OPT_o)) puts(line); } static int grep_file(FILE *file) { char *line; byte_t ret; int linenum = 0; int nmatches = 0; regmatch_t regmatch; #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 */ #endif /* ENABLE_FEATURE_GREP_CONTEXT */ while ((line = xmalloc_getline(file)) != NULL) { llist_t *pattern_ptr = pattern_head; grep_list_data_t * gl; linenum++; ret = 0; while (pattern_ptr) { gl = (grep_list_data_t *)pattern_ptr->data; if (FGREP_FLAG) { ret = strstr(line, gl->pattern) != NULL; } else { /* * test for a postitive-assertion match (regexec returns success (0) * and the user did not specify invert search), or a negative-assertion * match (regexec returns failure (REG_NOMATCH) and the user specified * invert search) */ if (!(gl->flg_mem_alocated_compiled & COMPILED)) { gl->flg_mem_alocated_compiled |= COMPILED; xregcomp(&(gl->preg), gl->pattern, reflags); } regmatch.rm_so = 0; regmatch.rm_eo = 0; ret |= regexec(&(gl->preg), line, 1, ®match, 0) == 0; } pattern_ptr = pattern_ptr->link; } /* while (pattern_ptr) */ if (ret ^ invert_search) { if (PRINT_FILES_WITH_MATCHES || BE_QUIET) free(line); /* if we found a match but were told to be quiet, stop here */ if (BE_QUIET || PRINT_FILES_WITHOUT_MATCHES) return -1; /* keep track of matches */ nmatches++; /* if we're just printing filenames, we stop after the first match */ if (PRINT_FILES_WITH_MATCHES) break; /* 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], 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 & GREP_OPT_o) { line[regmatch.rm_eo] = '\0'; print_line(line + regmatch.rm_so, linenum, ':'); } else { print_line(line, linenum, ':'); } } } #if ENABLE_FEATURE_GREP_CONTEXT else { /* no match */ /* Add the line to the circular 'before' buffer */ if (lines_before) { free(before_buf[curpos]); before_buf[curpos] = xstrdup(line); curpos = (curpos + 1) % lines_before; } } /* if we need to print some context lines after the last match, do so */ if (print_n_lines_after && (last_line_printed != linenum)) { print_line(line, linenum, '-'); print_n_lines_after--; } #endif /* ENABLE_FEATURE_GREP_CONTEXT */ free(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, but only if we grepped the line in the file */ if (PRINT_FILES_WITH_MATCHES && nmatches > 0) { puts(cur_file); } /* grep -L: print just the filename, but only if we didn't grep the line in the file */ if (PRINT_FILES_WITHOUT_MATCHES && nmatches == 0) { 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 = xmalloc(sizeof(grep_list_data_t)); 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(ffile, "r"); while ((line = xmalloc_getline(f)) != NULL) { llist_add_to(&pattern_head, new_grep_list_data(line, PATTERN_MEM_A)); } } } static int file_action_grep(const char *filename, struct stat *statbuf, void* matched, int depth) { FILE *file = fopen(filename, "r"); if (file == NULL) { if (!SUPPRESS_ERR_MSGS) bb_perror_msg("%s", cur_file); 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= */ 1, /* followLinks= */ 0, /* depthFirst= */ 1, /* fileAction= */ file_action_grep, /* dirAction= */ NULL, /* userData= */ &matched, /* depth= */ 0); return matched; } int grep_main(int argc, char **argv) { FILE *file; int matched; llist_t *fopt = NULL; /* do normal option parsing */ #if ENABLE_FEATURE_GREP_CONTEXT char *slines_after; char *slines_before; char *Copt; opt_complementary = "H-h:e::f::C-AB"; getopt32(argc, argv, GREP_OPTS GREP_OPT_CONTEXT OPT_EGREP, &pattern_head, &fopt, &slines_after, &slines_before, &Copt); if (option_mask32 & GREP_OPT_C) { /* -C unsets prev -A and -B, but following -A or -B may override it */ if (!(option_mask32 & GREP_OPT_A)) /* not overridden */ slines_after = Copt; if (!(option_mask32 & GREP_OPT_B)) /* not overridden */ slines_before = Copt; option_mask32 |= GREP_OPT_A|GREP_OPT_B; /* for parser */ } if (option_mask32 & GREP_OPT_A) { lines_after = xatoi_u(slines_after); } if (option_mask32 & GREP_OPT_B) { lines_before = xatoi_u(slines_before); } /* sanity checks */ if (option_mask32 & (GREP_OPT_c|GREP_OPT_q|GREP_OPT_l|GREP_OPT_L)) { option_mask32 &= ~GREP_OPT_n; lines_before = 0; lines_after = 0; } else if (lines_before > 0) before_buf = xzalloc(lines_before * sizeof(char *)); #else /* with auto sanity checks */ opt_complementary = "H-h:e::f::c-n:q-n:l-n"; getopt32(argc, argv, GREP_OPTS OPT_EGREP, &pattern_head, &fopt); #endif invert_search = ((option_mask32 & GREP_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 & GREP_OPT_f) load_regexes_from_file(fopt); if (ENABLE_FEATURE_GREP_FGREP_ALIAS && applet_name[0] == 'f') option_mask32 |= GREP_OPT_F; if (!(option_mask32 & GREP_OPT_o)) reflags = REG_NOSUB; if (ENABLE_FEATURE_GREP_EGREP_ALIAS && (applet_name[0] == 'e' || (option_mask32 & GREP_OPT_E))) reflags |= REG_EXTENDED; if (option_mask32 & GREP_OPT_i) reflags |= REG_ICASE; argv += optind; argc -= optind; /* if we didn't get a pattern from a -e and no command file was specified, * argv[optind] should be the pattern. no pattern, no worky */ if (pattern_head == NULL) { if (*argv == NULL) bb_show_usage(); else { char *pattern = new_grep_list_data(*argv++, 0); llist_add_to(&pattern_head, pattern); argc--; } } /* argv[(optind)..(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 & GREP_OPT_H) print_filename = 1; if (option_mask32 & GREP_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. */ if (argc == 0) argc++; matched = 0; while (argc--) { cur_file = *argv++; file = stdin; if (!cur_file || (*cur_file == '-' && !cur_file[1])) { cur_file = "(standard input)"; } else { if (option_mask32 & GREP_OPT_r) { struct stat st; if (stat(cur_file, &st) == 0 && S_ISDIR(st.st_mode)) { if (!(option_mask32 & GREP_OPT_h)) print_filename = 1; matched += grep_dir(cur_file); goto grep_done; } } /* else: fopen(dir) will succeed, but reading won't */ file = fopen(cur_file, "r"); if (file == NULL) { if (!SUPPRESS_ERR_MSGS) bb_perror_msg("%s", cur_file); open_errors = 1; continue; } } matched += grep_file(file); fclose_if_not_stdin(file); grep_done: if (matched < 0) { /* we found a match but were told to be quiet, stop here and * return success */ break; } } /* 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 & PATTERN_MEM_A)) free(gl->pattern); if ((gl->flg_mem_alocated_compiled & COMPILED)) regfree(&(gl->preg)); free(pattern_head_ptr); } } /* 0 = success, 1 = failed, 2 = error */ /* If the -q option is specified, the exit status shall be zero * if an input line is selected, even if an error was detected. */ if (BE_QUIET && matched) return 0; if (open_errors) return 2; return !matched; /* invert return value 0 = success, 1 = failed */ } |