1 /* $NetBSD: util.c,v 1.19 2018/02/05 22:14:26 mrg Exp $ */
2 /* $FreeBSD: head/usr.bin/grep/util.c 211496 2010-08-19 09:28:59Z des $ */
3 /* $OpenBSD: util.c,v 1.39 2010/07/02 22:18:03 tedu Exp $ */
4
5 /*-
6 * Copyright (c) 1999 James Howard and Dag-Erling Coïdan Smørgrav
7 * Copyright (C) 2008-2010 Gabor Kovesdan <gabor@FreeBSD.org>
8 * All rights reserved.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32 #if HAVE_NBTOOL_CONFIG_H
33 #include "nbtool_config.h"
34 #endif
35
36 #include <sys/cdefs.h>
37 __RCSID("$NetBSD: util.c,v 1.19 2018/02/05 22:14:26 mrg Exp $");
38
39 #include <sys/stat.h>
40 #include <sys/types.h>
41
42 #include <ctype.h>
43 #include <err.h>
44 #include <errno.h>
45 #include <fnmatch.h>
46 #include <fts.h>
47 #include <libgen.h>
48 #include <stdbool.h>
49 #include <stdio.h>
50 #include <stdlib.h>
51 #include <string.h>
52 #include <unistd.h>
53 #include <wchar.h>
54 #include <wctype.h>
55
56 #include "grep.h"
57
58 static bool first, first_global = true;
59 static unsigned long long since_printed;
60
61 static int procline(struct str *l, int);
62
63 bool
file_matching(const char * fname)64 file_matching(const char *fname)
65 {
66 char *fname_base, *fname_copy;
67 unsigned int i;
68 bool ret;
69
70 ret = finclude ? false : true;
71 fname_copy = grep_strdup(fname);
72 fname_base = basename(fname_copy);
73
74 for (i = 0; i < fpatterns; ++i) {
75 if (fnmatch(fpattern[i].pat, fname, 0) == 0 ||
76 fnmatch(fpattern[i].pat, fname_base, 0) == 0) {
77 if (fpattern[i].mode == EXCL_PAT) {
78 free(fname_copy);
79 return (false);
80 } else
81 ret = true;
82 }
83 }
84 free(fname_copy);
85 return (ret);
86 }
87
88 static inline bool
dir_matching(const char * dname)89 dir_matching(const char *dname)
90 {
91 unsigned int i;
92 bool ret;
93
94 ret = dinclude ? false : true;
95
96 for (i = 0; i < dpatterns; ++i) {
97 if (dname != NULL &&
98 fnmatch(dname, dpattern[i].pat, 0) == 0) {
99 if (dpattern[i].mode == EXCL_PAT)
100 return (false);
101 else
102 ret = true;
103 }
104 }
105 return (ret);
106 }
107
108 /*
109 * Processes a directory when a recursive search is performed with
110 * the -R option. Each appropriate file is passed to procfile().
111 */
112 int
grep_tree(char ** argv)113 grep_tree(char **argv)
114 {
115 FTS *fts;
116 FTSENT *p;
117 char *d, *dir = NULL;
118 int c, fts_flags;
119 bool ok;
120
121 c = fts_flags = 0;
122
123 switch(linkbehave) {
124 case LINK_EXPLICIT:
125 fts_flags = FTS_COMFOLLOW;
126 break;
127 case LINK_SKIP:
128 fts_flags = FTS_PHYSICAL;
129 break;
130 default:
131 fts_flags = FTS_LOGICAL;
132
133 }
134
135 fts_flags |= FTS_NOSTAT | FTS_NOCHDIR;
136
137 if (!(fts = fts_open(argv, fts_flags, NULL)))
138 err(2, "fts_open");
139 while ((p = fts_read(fts)) != NULL) {
140 switch (p->fts_info) {
141 case FTS_DNR:
142 /* FALLTHROUGH */
143 case FTS_ERR:
144 errx(2, "%s: %s", p->fts_path, strerror(p->fts_errno));
145 break;
146 case FTS_D:
147 /* FALLTHROUGH */
148 case FTS_DP:
149 break;
150 case FTS_DC:
151 /* Print a warning for recursive directory loop */
152 warnx("warning: %s: recursive directory loop",
153 p->fts_path);
154 break;
155 default:
156 /* Check for file exclusion/inclusion */
157 ok = true;
158 if (dexclude || dinclude) {
159 if ((d = strrchr(p->fts_path, '/')) != NULL) {
160 dir = grep_malloc(sizeof(char) *
161 (d - p->fts_path + 1));
162 memcpy(dir, p->fts_path,
163 d - p->fts_path);
164 dir[d - p->fts_path] = '\0';
165 }
166 ok = dir_matching(dir);
167 free(dir);
168 dir = NULL;
169 }
170 if (fexclude || finclude)
171 ok &= file_matching(p->fts_path);
172
173 if (ok)
174 c += procfile(p->fts_path);
175 break;
176 }
177 }
178
179 fts_close(fts);
180 return (c);
181 }
182
183 /*
184 * Opens a file and processes it. Each file is processed line-by-line
185 * passing the lines to procline().
186 */
187 int
procfile(const char * fn)188 procfile(const char *fn)
189 {
190 struct file *f;
191 struct stat sb;
192 struct str ln;
193 mode_t s;
194 int c, t;
195
196 if (mflag && (mcount <= 0))
197 return (0);
198
199 if (strcmp(fn, "-") == 0) {
200 fn = label != NULL ? label : getstr(1);
201 f = grep_open(NULL);
202 } else {
203 if (!stat(fn, &sb)) {
204 /* Check if we need to process the file */
205 s = sb.st_mode & S_IFMT;
206 if (s == S_IFDIR && dirbehave == DIR_SKIP)
207 return (0);
208 if ((s == S_IFIFO || s == S_IFCHR || s == S_IFBLK
209 || s == S_IFSOCK) && devbehave == DEV_SKIP)
210 return (0);
211 }
212 f = grep_open(fn);
213 }
214 if (f == NULL) {
215 if (!sflag)
216 warn("%s", fn);
217 if (errno == ENOENT)
218 notfound = true;
219 return (0);
220 }
221
222 ln.file = grep_malloc(strlen(fn) + 1);
223 strcpy(ln.file, fn);
224 ln.line_no = 0;
225 ln.len = 0;
226 tail = 0;
227 ln.off = -1;
228
229 for (first = true, c = 0; c == 0 || !(lflag || qflag); ) {
230 ln.off += ln.len + 1;
231 if ((ln.dat = grep_fgetln(f, &ln.len)) == NULL || ln.len == 0)
232 break;
233 if (ln.len > 0 && ln.dat[ln.len - 1] == line_sep)
234 --ln.len;
235 ln.line_no++;
236
237 /* Return if we need to skip a binary file */
238 if (f->binary && binbehave == BINFILE_SKIP) {
239 grep_close(f);
240 free(ln.file);
241 free(f);
242 return (0);
243 }
244 /* Process the file line-by-line */
245 t = procline(&ln, f->binary);
246 c += t;
247
248 /* Count the matches if we have a match limit */
249 if (mflag) {
250 mcount -= t;
251 if (mcount <= 0)
252 break;
253 }
254 }
255 if (Bflag > 0)
256 clearqueue();
257 grep_close(f);
258
259 if (cflag) {
260 if (!hflag)
261 printf("%s:", ln.file);
262 printf("%u%c", c, line_sep);
263 }
264 if (lflag && !qflag && c != 0)
265 printf("%s%c", fn, line_sep);
266 if (Lflag && !qflag && c == 0)
267 printf("%s%c", fn, line_sep);
268 if (c && !cflag && !lflag && !Lflag &&
269 binbehave == BINFILE_BIN && f->binary && !qflag)
270 printf(getstr(8), fn);
271
272 free(ln.file);
273 free(f);
274 return (c);
275 }
276
277 #define iswword(x) (iswalnum((x)) || (x) == L'_')
278
279 /*
280 * Processes a line comparing it with the specified patterns. Each pattern
281 * is looped to be compared along with the full string, saving each and every
282 * match, which is necessary to colorize the output and to count the
283 * matches. The matching lines are passed to printline() to display the
284 * appropriate output.
285 */
286 static int
procline(struct str * l,int nottext)287 procline(struct str *l, int nottext)
288 {
289 regmatch_t matches[MAX_LINE_MATCHES];
290 regmatch_t pmatch;
291 size_t st = 0;
292 unsigned int i;
293 int c = 0, m = 0, r = 0;
294
295 /* Loop to process the whole line */
296 while (st <= l->len) {
297 pmatch.rm_so = st;
298 pmatch.rm_eo = l->len;
299
300 /* Loop to compare with all the patterns */
301 for (i = 0; i < patterns; i++) {
302 /*
303 * XXX: grep_search() is a workaround for speed up and should be
304 * removed in the future. See fastgrep.c.
305 */
306 if (fg_pattern[i].pattern) {
307 r = grep_search(&fg_pattern[i],
308 (unsigned char *)l->dat,
309 l->len, &pmatch);
310 r = (r == 0) ? 0 : REG_NOMATCH;
311 st = pmatch.rm_eo;
312 } else {
313 r = regexec(&r_pattern[i], l->dat, 1,
314 &pmatch, eflags);
315 r = (r == 0) ? 0 : REG_NOMATCH;
316 st = pmatch.rm_eo;
317 }
318 if (r == REG_NOMATCH)
319 continue;
320 /* Check for full match */
321 if (xflag &&
322 (pmatch.rm_so != 0 ||
323 (size_t)pmatch.rm_eo != l->len))
324 continue;
325 /* Check for whole word match */
326 if (fg_pattern[i].word && pmatch.rm_so != 0) {
327 wchar_t wbegin, wend;
328
329 wbegin = wend = L' ';
330 if (pmatch.rm_so != 0 &&
331 sscanf(&l->dat[pmatch.rm_so - 1],
332 "%lc", &wbegin) != 1)
333 continue;
334 if ((size_t)pmatch.rm_eo != l->len &&
335 sscanf(&l->dat[pmatch.rm_eo],
336 "%lc", &wend) != 1)
337 continue;
338 if (iswword(wbegin) || iswword(wend))
339 continue;
340 }
341 c = 1;
342 if (m < MAX_LINE_MATCHES)
343 matches[m++] = pmatch;
344 /* matches - skip further patterns */
345 if ((color != NULL && !oflag) || qflag || lflag)
346 break;
347 }
348
349 if (vflag) {
350 c = !c;
351 break;
352 }
353 /* One pass if we are not recording matches */
354 if ((color != NULL && !oflag) || qflag || lflag)
355 break;
356
357 if (st == (size_t)pmatch.rm_so)
358 break; /* No matches */
359 }
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 ((Aflag || Bflag) && !first_global &&
368 (first || since_printed > Bflag))
369 printf("--\n");
370 tail = Aflag;
371 if (Bflag > 0)
372 printqueue();
373 printline(l, ':', matches, m);
374 } else {
375 printline(l, '-', matches, m);
376 tail--;
377 }
378 first = false;
379 first_global = false;
380 since_printed = 0;
381 } else {
382 if (Bflag)
383 enqueue(l);
384 since_printed++;
385 }
386 return (c);
387 }
388
389 /*
390 * Safe malloc() for internal use.
391 */
392 void *
grep_malloc(size_t size)393 grep_malloc(size_t size)
394 {
395 void *ptr;
396
397 if ((ptr = malloc(size)) == NULL)
398 err(2, "malloc");
399 return (ptr);
400 }
401
402 /*
403 * Safe calloc() for internal use.
404 */
405 void *
grep_calloc(size_t nmemb,size_t size)406 grep_calloc(size_t nmemb, size_t size)
407 {
408 void *ptr;
409
410 if ((ptr = calloc(nmemb, size)) == NULL)
411 err(2, "calloc");
412 return (ptr);
413 }
414
415 /*
416 * Safe realloc() for internal use.
417 */
418 void *
grep_realloc(void * ptr,size_t size)419 grep_realloc(void *ptr, size_t size)
420 {
421
422 if ((ptr = realloc(ptr, size)) == NULL)
423 err(2, "realloc");
424 return (ptr);
425 }
426
427 /*
428 * Safe strdup() for internal use.
429 */
430 char *
grep_strdup(const char * str)431 grep_strdup(const char *str)
432 {
433 char *ret;
434
435 if ((ret = strdup(str)) == NULL)
436 err(2, "strdup");
437 return (ret);
438 }
439
440 /*
441 * Prints a matching line according to the command line options.
442 */
443 void
printline(struct str * line,int sep,regmatch_t * matches,int m)444 printline(struct str *line, int sep, regmatch_t *matches, int m)
445 {
446 size_t a = 0;
447 int i, n = 0;
448
449 if (!hflag) {
450 if (nullflag == 0)
451 fputs(line->file, stdout);
452 else {
453 printf("%s", line->file);
454 putchar(0);
455 }
456 ++n;
457 }
458 if (nflag) {
459 if (n > 0)
460 putchar(sep);
461 printf("%d", line->line_no);
462 ++n;
463 }
464 if (bflag) {
465 if (n > 0)
466 putchar(sep);
467 printf("%lld", (long long)line->off);
468 ++n;
469 }
470 if (n)
471 putchar(sep);
472 /* --color and -o */
473 if ((oflag || color) && m > 0) {
474 for (i = 0; i < m; i++) {
475 if (!oflag)
476 fwrite(line->dat + a, matches[i].rm_so - a, 1,
477 stdout);
478 if (color)
479 fprintf(stdout, "\33[%sm\33[K", color);
480
481 fwrite(line->dat + matches[i].rm_so,
482 matches[i].rm_eo - matches[i].rm_so, 1,
483 stdout);
484
485 if (color)
486 fprintf(stdout, "\33[m\33[K");
487 a = matches[i].rm_eo;
488 if (oflag)
489 putchar('\n');
490 }
491 if (!oflag) {
492 if (line->len - a > 0)
493 fwrite(line->dat + a, line->len - a, 1, stdout);
494 putchar(line_sep);
495 }
496 } else {
497 fwrite(line->dat, line->len, 1, stdout);
498 putchar(line_sep);
499 }
500 }
501