1 /* $OpenBSD: util.c,v 1.39 2010/07/02 22:18:03 tedu Exp $ */ 2 3 /*- 4 * Copyright (c) 1999 James Howard and Dag-Erling Coïdan Smørgrav 5 * Copyright (C) 2008-2010 Gabor Kovesdan <gabor@FreeBSD.org> 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30 #include <sys/cdefs.h> 31 __FBSDID("$FreeBSD$"); 32 33 #include <sys/stat.h> 34 #include <sys/types.h> 35 36 #include <ctype.h> 37 #include <err.h> 38 #include <errno.h> 39 #include <fnmatch.h> 40 #include <fts.h> 41 #include <libgen.h> 42 #include <stdbool.h> 43 #include <stdio.h> 44 #include <stdlib.h> 45 #include <string.h> 46 #include <unistd.h> 47 #include <wchar.h> 48 #include <wctype.h> 49 50 #include "grep.h" 51 52 static int linesqueued; 53 static int procline(struct str *l, int); 54 55 bool 56 file_matching(const char *fname) 57 { 58 bool ret; 59 60 ret = finclude ? false : true; 61 62 for (unsigned int i = 0; i < fpatterns; ++i) { 63 if (fnmatch(fpattern[i].pat, 64 fname, 0) == 0 || fnmatch(fpattern[i].pat, 65 basename(fname), 0) == 0) { 66 if (fpattern[i].mode == EXCL_PAT) 67 return (false); 68 else 69 ret = true; 70 } 71 } 72 return (ret); 73 } 74 75 static inline bool 76 dir_matching(const char *dname) 77 { 78 bool ret; 79 80 ret = dinclude ? false : true; 81 82 for (unsigned int i = 0; i < dpatterns; ++i) { 83 if (dname != NULL && 84 fnmatch(dname, dpattern[i].pat, 0) == 0) { 85 if (dpattern[i].mode == EXCL_PAT) 86 return (false); 87 else 88 ret = true; 89 } 90 } 91 return (ret); 92 } 93 94 /* 95 * Processes a directory when a recursive search is performed with 96 * the -R option. Each appropriate file is passed to procfile(). 97 */ 98 int 99 grep_tree(char **argv) 100 { 101 FTS *fts; 102 FTSENT *p; 103 char *d, *dir = NULL; 104 int c, fts_flags; 105 bool ok; 106 107 c = fts_flags = 0; 108 109 switch(linkbehave) { 110 case LINK_EXPLICIT: 111 fts_flags = FTS_COMFOLLOW; 112 break; 113 case LINK_SKIP: 114 fts_flags = FTS_PHYSICAL; 115 break; 116 default: 117 fts_flags = FTS_LOGICAL; 118 119 } 120 121 fts_flags |= FTS_NOSTAT | FTS_NOCHDIR; 122 123 if (!(fts = fts_open(argv, fts_flags, NULL))) 124 err(2, "fts_open"); 125 while ((p = fts_read(fts)) != NULL) { 126 switch (p->fts_info) { 127 case FTS_DNR: 128 /* FALLTHROUGH */ 129 case FTS_ERR: 130 errx(2, "%s: %s", p->fts_path, strerror(p->fts_errno)); 131 break; 132 case FTS_D: 133 /* FALLTHROUGH */ 134 case FTS_DP: 135 break; 136 case FTS_DC: 137 /* Print a warning for recursive directory loop */ 138 warnx("warning: %s: recursive directory loop", 139 p->fts_path); 140 break; 141 default: 142 /* Check for file exclusion/inclusion */ 143 ok = true; 144 if (dexclude || dinclude) { 145 if ((d = strrchr(p->fts_path, '/')) != NULL) { 146 dir = grep_malloc(sizeof(char) * 147 (d - p->fts_path + 1)); 148 memcpy(dir, p->fts_path, 149 d - p->fts_path); 150 dir[d - p->fts_path] = '\0'; 151 } 152 ok = dir_matching(dir); 153 free(dir); 154 dir = NULL; 155 } 156 if (fexclude || finclude) 157 ok &= file_matching(p->fts_path); 158 159 if (ok) 160 c += procfile(p->fts_path); 161 break; 162 } 163 } 164 165 fts_close(fts); 166 return (c); 167 } 168 169 /* 170 * Opens a file and processes it. Each file is processed line-by-line 171 * passing the lines to procline(). 172 */ 173 int 174 procfile(const char *fn) 175 { 176 struct file *f; 177 struct stat sb; 178 struct str ln; 179 mode_t s; 180 int c, t; 181 182 if (mflag && (mcount <= 0)) 183 return (0); 184 185 if (strcmp(fn, "-") == 0) { 186 fn = label != NULL ? label : getstr(1); 187 f = grep_open(NULL); 188 } else { 189 if (!stat(fn, &sb)) { 190 /* Check if we need to process the file */ 191 s = sb.st_mode & S_IFMT; 192 if (s == S_IFDIR && dirbehave == DIR_SKIP) 193 return (0); 194 if ((s == S_IFIFO || s == S_IFCHR || s == S_IFBLK 195 || s == S_IFSOCK) && devbehave == DEV_SKIP) 196 return (0); 197 } 198 f = grep_open(fn); 199 } 200 if (f == NULL) { 201 if (!sflag) 202 warn("%s", fn); 203 if (errno == ENOENT) 204 notfound = true; 205 return (0); 206 } 207 208 ln.file = grep_malloc(strlen(fn) + 1); 209 strcpy(ln.file, fn); 210 ln.line_no = 0; 211 ln.len = 0; 212 linesqueued = 0; 213 tail = 0; 214 ln.off = -1; 215 216 for (c = 0; c == 0 || !(lflag || qflag); ) { 217 ln.off += ln.len + 1; 218 if ((ln.dat = grep_fgetln(f, &ln.len)) == NULL || ln.len == 0) { 219 if (ln.line_no == 0 && matchall) 220 exit(0); 221 else 222 break; 223 } 224 if (ln.len > 0 && ln.dat[ln.len - 1] == '\n') 225 --ln.len; 226 ln.line_no++; 227 228 /* Return if we need to skip a binary file */ 229 if (f->binary && binbehave == BINFILE_SKIP) { 230 grep_close(f); 231 free(ln.file); 232 free(f); 233 return (0); 234 } 235 /* Process the file line-by-line */ 236 if ((t = procline(&ln, f->binary)) == 0 && Bflag > 0) { 237 enqueue(&ln); 238 linesqueued++; 239 } 240 c += t; 241 242 /* Count the matches if we have a match limit */ 243 if (mflag) { 244 mcount -= t; 245 if (mcount <= 0) 246 break; 247 } 248 } 249 if (Bflag > 0) 250 clearqueue(); 251 grep_close(f); 252 253 if (cflag) { 254 if (!hflag) 255 printf("%s:", ln.file); 256 printf("%u\n", c); 257 } 258 if (lflag && !qflag && c != 0) 259 printf("%s\n", fn); 260 if (Lflag && !qflag && c == 0) 261 printf("%s\n", fn); 262 if (c && !cflag && !lflag && !Lflag && 263 binbehave == BINFILE_BIN && f->binary && !qflag) 264 printf(getstr(8), fn); 265 266 free(ln.file); 267 free(f); 268 return (c); 269 } 270 271 #define iswword(x) (iswalnum((x)) || (x) == L'_') 272 273 /* 274 * Processes a line comparing it with the specified patterns. Each pattern 275 * is looped to be compared along with the full string, saving each and every 276 * match, which is necessary to colorize the output and to count the 277 * matches. The matching lines are passed to printline() to display the 278 * appropriate output. 279 */ 280 static inline int 281 procline(struct str *l, int nottext) 282 { 283 regmatch_t matches[MAX_LINE_MATCHES]; 284 regmatch_t pmatch; 285 size_t st = 0; 286 unsigned int i; 287 int c = 0, m = 0, r = 0; 288 289 if (!matchall) { 290 /* Loop to process the whole line */ 291 while (st <= l->len) { 292 pmatch.rm_so = st; 293 pmatch.rm_eo = l->len; 294 295 /* Loop to compare with all the patterns */ 296 for (i = 0; i < patterns; i++) { 297 /* 298 * XXX: grep_search() is a workaround for speed up and should be 299 * removed in the future. See fastgrep.c. 300 */ 301 if (fg_pattern[i].pattern) { 302 r = grep_search(&fg_pattern[i], 303 (unsigned char *)l->dat, 304 l->len, &pmatch); 305 r = (r == 0) ? 0 : REG_NOMATCH; 306 st = pmatch.rm_eo; 307 } else { 308 r = regexec(&r_pattern[i], l->dat, 1, 309 &pmatch, eflags); 310 r = (r == 0) ? 0 : REG_NOMATCH; 311 st = pmatch.rm_eo; 312 } 313 if (r == REG_NOMATCH) 314 continue; 315 /* Check for full match */ 316 if (r == 0 && xflag) 317 if (pmatch.rm_so != 0 || 318 (size_t)pmatch.rm_eo != l->len) 319 r = REG_NOMATCH; 320 /* Check for whole word match */ 321 if (r == 0 && wflag && pmatch.rm_so != 0) { 322 wint_t wbegin, wend; 323 324 wbegin = wend = L' '; 325 if (pmatch.rm_so != 0 && 326 sscanf(&l->dat[pmatch.rm_so - 1], 327 "%lc", &wbegin) != 1) 328 r = REG_NOMATCH; 329 else if ((size_t)pmatch.rm_eo != l->len && 330 sscanf(&l->dat[pmatch.rm_eo], 331 "%lc", &wend) != 1) 332 r = REG_NOMATCH; 333 else if (iswword(wbegin) || iswword(wend)) 334 r = REG_NOMATCH; 335 } 336 if (r == 0) { 337 if (m == 0) 338 c++; 339 if (m < MAX_LINE_MATCHES) 340 matches[m++] = pmatch; 341 /* matches - skip further patterns */ 342 if ((color != NULL && !oflag) || qflag || lflag) 343 break; 344 } 345 } 346 347 if (vflag) { 348 c = !c; 349 break; 350 } 351 /* One pass if we are not recording matches */ 352 if ((color != NULL && !oflag) || qflag || lflag) 353 break; 354 355 if (st == (size_t)pmatch.rm_so) 356 break; /* No matches */ 357 } 358 } else 359 c = !vflag; 360 361 if (c && binbehave == BINFILE_BIN && nottext) 362 return (c); /* Binary file */ 363 364 /* Dealing with the context */ 365 if ((tail || c) && !cflag && !qflag && !lflag && !Lflag) { 366 if (c) { 367 if (!first && !prev && !tail && Aflag) 368 printf("--\n"); 369 tail = Aflag; 370 if (Bflag > 0) { 371 if (!first && !prev) 372 printf("--\n"); 373 printqueue(); 374 } 375 linesqueued = 0; 376 printline(l, ':', matches, m); 377 } else { 378 printline(l, '-', matches, m); 379 tail--; 380 } 381 } 382 383 if (c) { 384 prev = true; 385 first = false; 386 } else 387 prev = false; 388 389 return (c); 390 } 391 392 /* 393 * Safe malloc() for internal use. 394 */ 395 void * 396 grep_malloc(size_t size) 397 { 398 void *ptr; 399 400 if ((ptr = malloc(size)) == NULL) 401 err(2, "malloc"); 402 return (ptr); 403 } 404 405 /* 406 * Safe calloc() for internal use. 407 */ 408 void * 409 grep_calloc(size_t nmemb, size_t size) 410 { 411 void *ptr; 412 413 if ((ptr = calloc(nmemb, size)) == NULL) 414 err(2, "calloc"); 415 return (ptr); 416 } 417 418 /* 419 * Safe realloc() for internal use. 420 */ 421 void * 422 grep_realloc(void *ptr, size_t size) 423 { 424 425 if ((ptr = realloc(ptr, size)) == NULL) 426 err(2, "realloc"); 427 return (ptr); 428 } 429 430 /* 431 * Safe strdup() for internal use. 432 */ 433 char * 434 grep_strdup(const char *str) 435 { 436 char *ret; 437 438 if ((ret = strdup(str)) == NULL) 439 err(2, "strdup"); 440 return (ret); 441 } 442 443 /* 444 * Prints a matching line according to the command line options. 445 */ 446 void 447 printline(struct str *line, int sep, regmatch_t *matches, int m) 448 { 449 size_t a = 0; 450 int i, n = 0; 451 452 if (!hflag) { 453 if (nullflag == 0) 454 fputs(line->file, stdout); 455 else { 456 printf("%s", line->file); 457 putchar(0); 458 } 459 ++n; 460 } 461 if (nflag) { 462 if (n > 0) 463 putchar(sep); 464 printf("%d", line->line_no); 465 ++n; 466 } 467 if (bflag) { 468 if (n > 0) 469 putchar(sep); 470 printf("%lld", (long long)line->off); 471 ++n; 472 } 473 if (n) 474 putchar(sep); 475 /* --color and -o */ 476 if ((oflag || color) && m > 0) { 477 for (i = 0; i < m; i++) { 478 if (!oflag) 479 fwrite(line->dat + a, matches[i].rm_so - a, 1, 480 stdout); 481 if (color) 482 fprintf(stdout, "\33[%sm\33[K", color); 483 484 fwrite(line->dat + matches[i].rm_so, 485 matches[i].rm_eo - matches[i].rm_so, 1, 486 stdout); 487 if (color) 488 fprintf(stdout, "\33[m\33[K"); 489 a = matches[i].rm_eo; 490 if (oflag) 491 putchar('\n'); 492 } 493 if (!oflag) { 494 if (line->len - a > 0) 495 fwrite(line->dat + a, line->len - a, 1, stdout); 496 putchar('\n'); 497 } 498 } else { 499 fwrite(line->dat, line->len, 1, stdout); 500 putchar('\n'); 501 } 502 } 503