File: | src/usr.bin/grep/grep.c |
Warning: | line 202, column 3 Value stored to 'len' is never read |
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1 | /* $OpenBSD: grep.c,v 1.65 2020/07/23 20:19:27 martijn Exp $ */ |
2 | |
3 | /*- |
4 | * Copyright (c) 1999 James Howard and Dag-Erling Coïdan Smørgrav |
5 | * All rights reserved. |
6 | * |
7 | * Redistribution and use in source and binary forms, with or without |
8 | * modification, are permitted provided that the following conditions |
9 | * are met: |
10 | * 1. Redistributions of source code must retain the above copyright |
11 | * notice, this list of conditions and the following disclaimer. |
12 | * 2. Redistributions in binary form must reproduce the above copyright |
13 | * notice, this list of conditions and the following disclaimer in the |
14 | * documentation and/or other materials provided with the distribution. |
15 | * |
16 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
17 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
18 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
19 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
20 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
21 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
22 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
23 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
24 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
25 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
26 | * SUCH DAMAGE. |
27 | */ |
28 | |
29 | #include <sys/types.h> |
30 | #include <sys/stat.h> |
31 | #include <sys/queue.h> |
32 | |
33 | #include <ctype.h> |
34 | #include <err.h> |
35 | #include <errno(*__errno()).h> |
36 | #include <getopt.h> |
37 | #include <regex.h> |
38 | #include <stdio.h> |
39 | #include <stdlib.h> |
40 | #include <string.h> |
41 | #include <unistd.h> |
42 | |
43 | #include "grep.h" |
44 | |
45 | /* Flags passed to regcomp() and regexec() */ |
46 | int cflags; |
47 | int eflags = REG_STARTEND00004; |
48 | |
49 | int matchall; /* shortcut */ |
50 | int patterns, pattern_sz; |
51 | char **pattern; |
52 | regex_t *r_pattern; |
53 | fastgrep_t *fg_pattern; |
54 | |
55 | /* For regex errors */ |
56 | char re_error[RE_ERROR_BUF512 + 1]; |
57 | |
58 | /* Command-line flags */ |
59 | int Aflag; /* -A x: print x lines trailing each match */ |
60 | int Bflag; /* -B x: print x lines leading each match */ |
61 | int Eflag; /* -E: interpret pattern as extended regexp */ |
62 | int Fflag; /* -F: interpret pattern as list of fixed strings */ |
63 | int Hflag; /* -H: always print filename header */ |
64 | int Lflag; /* -L: only show names of files with no matches */ |
65 | int Rflag; /* -R: recursively search directory trees */ |
66 | int Zflag; /* -Z: decompress input before processing */ |
67 | int bflag; /* -b: show block numbers for each match */ |
68 | int cflag; /* -c: only show a count of matching lines */ |
69 | int hflag; /* -h: don't print filename headers */ |
70 | int iflag; /* -i: ignore case */ |
71 | int lflag; /* -l: only show names of files with matches */ |
72 | int mflag; /* -m x: stop reading the files after x matches */ |
73 | long long mcount; /* count for -m */ |
74 | long long mlimit; /* requested value for -m */ |
75 | int nflag; /* -n: show line numbers in front of matching lines */ |
76 | int oflag; /* -o: print each match */ |
77 | int qflag; /* -q: quiet mode (don't output anything) */ |
78 | int sflag; /* -s: silent mode (ignore errors) */ |
79 | int vflag; /* -v: only show non-matching lines */ |
80 | int wflag; /* -w: pattern must start and end on word boundaries */ |
81 | int xflag; /* -x: pattern must match entire line */ |
82 | int lbflag; /* --line-buffered */ |
83 | const char *labelname; /* --label=name */ |
84 | |
85 | int binbehave = BIN_FILE_BIN0; |
86 | |
87 | enum { |
88 | BIN_OPT = CHAR_MAX127 + 1, |
89 | HELP_OPT, |
90 | MMAP_OPT, |
91 | LINEBUF_OPT, |
92 | LABEL_OPT, |
93 | }; |
94 | |
95 | /* Housekeeping */ |
96 | int first; /* flag whether or not this is our first match */ |
97 | int tail; /* lines left to print */ |
98 | int file_err; /* file reading error */ |
99 | |
100 | struct patfile { |
101 | const char *pf_file; |
102 | SLIST_ENTRY(patfile)struct { struct patfile *sle_next; } pf_next; |
103 | }; |
104 | SLIST_HEAD(, patfile)struct { struct patfile *slh_first; } patfilelh; |
105 | |
106 | extern char *__progname; |
107 | |
108 | static void |
109 | usage(void) |
110 | { |
111 | fprintf(stderr(&__sF[2]), |
112 | #ifdef NOZ |
113 | "usage: %s [-abcEFGHhIiLlnoqRsUVvwx] [-A num] [-B num] [-C[num]]" |
114 | #else |
115 | "usage: %s [-abcEFGHhIiLlnoqRsUVvwxZ] [-A num] [-B num] [-C[num]]" |
116 | #endif |
117 | " [-e pattern]\n" |
118 | "\t[-f file] [-m num] [--binary-files=value] [--context[=num]]\n" |
119 | "\t[--label=name] [--line-buffered] [pattern] [file ...]\n", |
120 | __progname); |
121 | exit(2); |
122 | } |
123 | |
124 | #ifdef NOZ |
125 | static const char optstr[] = "0123456789A:B:CEFGHILRUVabce:f:hilm:noqrsuvwxy"; |
126 | #else |
127 | static const char optstr[] = "0123456789A:B:CEFGHILRUVZabce:f:hilm:noqrsuvwxy"; |
128 | #endif |
129 | |
130 | static const struct option long_options[] = |
131 | { |
132 | {"binary-files", required_argument1, NULL((void*)0), BIN_OPT}, |
133 | {"help", no_argument0, NULL((void*)0), HELP_OPT}, |
134 | {"mmap", no_argument0, NULL((void*)0), MMAP_OPT}, |
135 | {"label", required_argument1, NULL((void*)0), LABEL_OPT}, |
136 | {"line-buffered", no_argument0, NULL((void*)0), LINEBUF_OPT}, |
137 | {"after-context", required_argument1, NULL((void*)0), 'A'}, |
138 | {"before-context", required_argument1, NULL((void*)0), 'B'}, |
139 | {"context", optional_argument2, NULL((void*)0), 'C'}, |
140 | {"devices", required_argument1, NULL((void*)0), 'D'}, |
141 | {"extended-regexp", no_argument0, NULL((void*)0), 'E'}, |
142 | {"fixed-strings", no_argument0, NULL((void*)0), 'F'}, |
143 | {"basic-regexp", no_argument0, NULL((void*)0), 'G'}, |
144 | {"with-filename", no_argument0, NULL((void*)0), 'H'}, |
145 | {"binary", no_argument0, NULL((void*)0), 'U'}, |
146 | {"version", no_argument0, NULL((void*)0), 'V'}, |
147 | {"text", no_argument0, NULL((void*)0), 'a'}, |
148 | {"byte-offset", no_argument0, NULL((void*)0), 'b'}, |
149 | {"count", no_argument0, NULL((void*)0), 'c'}, |
150 | {"regexp", required_argument1, NULL((void*)0), 'e'}, |
151 | {"file", required_argument1, NULL((void*)0), 'f'}, |
152 | {"no-filename", no_argument0, NULL((void*)0), 'h'}, |
153 | {"ignore-case", no_argument0, NULL((void*)0), 'i'}, |
154 | {"files-without-match", no_argument0, NULL((void*)0), 'L'}, |
155 | {"files-with-matches", no_argument0, NULL((void*)0), 'l'}, |
156 | {"max-count", required_argument1, NULL((void*)0), 'm'}, |
157 | {"line-number", no_argument0, NULL((void*)0), 'n'}, |
158 | {"quiet", no_argument0, NULL((void*)0), 'q'}, |
159 | {"silent", no_argument0, NULL((void*)0), 'q'}, |
160 | {"recursive", no_argument0, NULL((void*)0), 'r'}, |
161 | {"no-messages", no_argument0, NULL((void*)0), 's'}, |
162 | {"revert-match", no_argument0, NULL((void*)0), 'v'}, |
163 | {"word-regexp", no_argument0, NULL((void*)0), 'w'}, |
164 | {"line-regexp", no_argument0, NULL((void*)0), 'x'}, |
165 | {"unix-byte-offsets", no_argument0, NULL((void*)0), 'u'}, |
166 | #ifndef NOZ |
167 | {"decompress", no_argument0, NULL((void*)0), 'Z'}, |
168 | #endif |
169 | {NULL((void*)0), no_argument0, NULL((void*)0), 0} |
170 | }; |
171 | |
172 | |
173 | static void |
174 | add_pattern(char *pat, size_t len) |
175 | { |
176 | if (!xflag && (len == 0 || matchall)) { |
177 | matchall = 1; |
178 | return; |
179 | } |
180 | if (patterns == pattern_sz) { |
181 | pattern_sz *= 2; |
182 | pattern = grep_reallocarray(pattern, ++pattern_sz, sizeof(*pattern)); |
183 | } |
184 | if (len > 0 && pat[len - 1] == '\n') |
185 | --len; |
186 | /* pat may not be NUL-terminated */ |
187 | if (wflag && !Fflag) { |
188 | int bol = 0, eol = 0, extra; |
189 | if (pat[0] == '^') |
190 | bol = 1; |
191 | if (len > 0 && pat[len - 1] == '$') |
192 | eol = 1; |
193 | extra = Eflag ? 2 : 4; |
194 | pattern[patterns] = grep_malloc(len + 15 + extra); |
195 | snprintf(pattern[patterns], len + 15 + extra, |
196 | "%s[[:<:]]%s%.*s%s[[:>:]]%s", |
197 | bol ? "^" : "", |
198 | Eflag ? "(" : "\\(", |
199 | (int)len - bol - eol, pat + bol, |
200 | Eflag ? ")" : "\\)", |
201 | eol ? "$" : ""); |
202 | len += 14 + extra; |
Value stored to 'len' is never read | |
203 | } else { |
204 | pattern[patterns] = grep_malloc(len + 1); |
205 | memcpy(pattern[patterns], pat, len); |
206 | pattern[patterns][len] = '\0'; |
207 | } |
208 | ++patterns; |
209 | } |
210 | |
211 | static void |
212 | add_patterns(char *pats) |
213 | { |
214 | char *nl; |
215 | |
216 | while ((nl = strchr(pats, '\n')) != NULL((void*)0)) { |
217 | add_pattern(pats, nl - pats); |
218 | pats = nl + 1; |
219 | } |
220 | add_pattern(pats, strlen(pats)); |
221 | } |
222 | |
223 | static void |
224 | read_patterns(const char *fn) |
225 | { |
226 | FILE *f; |
227 | char *line; |
228 | ssize_t len; |
229 | size_t linesize; |
230 | |
231 | if ((f = fopen(fn, "r")) == NULL((void*)0)) |
232 | err(2, "%s", fn); |
233 | line = NULL((void*)0); |
234 | linesize = 0; |
235 | while ((len = getline(&line, &linesize, f)) != -1) |
236 | add_pattern(line, *line == '\n' ? 0 : len); |
237 | if (ferror(f)(!__isthreaded ? (((f)->_flags & 0x0040) != 0) : (ferror )(f))) |
238 | err(2, "%s", fn); |
239 | fclose(f); |
240 | free(line); |
241 | } |
242 | |
243 | int |
244 | main(int argc, char *argv[]) |
245 | { |
246 | int c, lastc, prevoptind, newarg, i, needpattern, exprs, expr_sz; |
247 | struct patfile *patfile, *pf_next; |
248 | long l; |
249 | char **expr; |
250 | const char *errstr; |
251 | |
252 | if (pledge("stdio rpath", NULL((void*)0)) == -1) |
253 | err(2, "pledge"); |
254 | |
255 | SLIST_INIT(&patfilelh){ ((&patfilelh)->slh_first) = ((void*)0); }; |
256 | switch (__progname[0]) { |
257 | case 'e': |
258 | Eflag = 1; |
259 | break; |
260 | case 'f': |
261 | Fflag = 1; |
262 | break; |
263 | #ifndef NOZ |
264 | case 'z': |
265 | Zflag = 1; |
266 | switch(__progname[1]) { |
267 | case 'e': |
268 | Eflag = 1; |
269 | break; |
270 | case 'f': |
271 | Fflag = 1; |
272 | break; |
273 | } |
274 | break; |
275 | #endif |
276 | } |
277 | |
278 | lastc = '\0'; |
279 | newarg = 1; |
280 | prevoptind = 1; |
281 | needpattern = 1; |
282 | expr_sz = exprs = 0; |
283 | expr = NULL((void*)0); |
284 | while ((c = getopt_long(argc, argv, optstr, |
285 | long_options, NULL((void*)0))) != -1) { |
286 | switch (c) { |
287 | case '0': case '1': case '2': case '3': case '4': |
288 | case '5': case '6': case '7': case '8': case '9': |
289 | if (newarg || !isdigit(lastc)) |
290 | Aflag = 0; |
291 | else if (Aflag > INT_MAX2147483647 / 10) |
292 | errx(2, "context out of range"); |
293 | Aflag = Bflag = (Aflag * 10) + (c - '0'); |
294 | break; |
295 | case 'A': |
296 | case 'B': |
297 | l = strtonum(optarg, 1, INT_MAX2147483647, &errstr); |
298 | if (errstr != NULL((void*)0)) |
299 | errx(2, "context %s", errstr); |
300 | if (c == 'A') |
301 | Aflag = (int)l; |
302 | else |
303 | Bflag = (int)l; |
304 | break; |
305 | case 'C': |
306 | if (optarg == NULL((void*)0)) |
307 | Aflag = Bflag = 2; |
308 | else { |
309 | l = strtonum(optarg, 1, INT_MAX2147483647, &errstr); |
310 | if (errstr != NULL((void*)0)) |
311 | errx(2, "context %s", errstr); |
312 | Aflag = Bflag = (int)l; |
313 | } |
314 | break; |
315 | case 'E': |
316 | Fflag = 0; |
317 | Eflag = 1; |
318 | break; |
319 | case 'F': |
320 | Eflag = 0; |
321 | Fflag = 1; |
322 | break; |
323 | case 'G': |
324 | Eflag = Fflag = 0; |
325 | break; |
326 | case 'H': |
327 | Hflag = 1; |
328 | break; |
329 | case 'I': |
330 | binbehave = BIN_FILE_SKIP1; |
331 | break; |
332 | case 'L': |
333 | lflag = 0; |
334 | Lflag = qflag = 1; |
335 | break; |
336 | case 'R': |
337 | case 'r': |
338 | Rflag = 1; |
339 | break; |
340 | case 'U': |
341 | binbehave = BIN_FILE_BIN0; |
342 | break; |
343 | case 'V': |
344 | fprintf(stderr(&__sF[2]), "grep version %u.%u\n", VER_MAJ0, VER_MIN9); |
345 | exit(0); |
346 | break; |
347 | #ifndef NOZ |
348 | case 'Z': |
349 | Zflag = 1; |
350 | break; |
351 | #endif |
352 | case 'a': |
353 | binbehave = BIN_FILE_TEXT2; |
354 | break; |
355 | case 'b': |
356 | bflag = 1; |
357 | break; |
358 | case 'c': |
359 | cflag = 1; |
360 | break; |
361 | case 'e': |
362 | /* defer adding of expressions until all arguments are parsed */ |
363 | if (exprs == expr_sz) { |
364 | expr_sz *= 2; |
365 | expr = grep_reallocarray(expr, ++expr_sz, |
366 | sizeof(*expr)); |
367 | } |
368 | needpattern = 0; |
369 | expr[exprs] = optarg; |
370 | ++exprs; |
371 | break; |
372 | case 'f': |
373 | patfile = grep_malloc(sizeof(*patfile)); |
374 | patfile->pf_file = optarg; |
375 | SLIST_INSERT_HEAD(&patfilelh, patfile, pf_next)do { (patfile)->pf_next.sle_next = (&patfilelh)->slh_first ; (&patfilelh)->slh_first = (patfile); } while (0); |
376 | needpattern = 0; |
377 | break; |
378 | case 'h': |
379 | hflag = 1; |
380 | break; |
381 | case 'i': |
382 | case 'y': |
383 | iflag = 1; |
384 | cflags |= REG_ICASE0002; |
385 | break; |
386 | case 'l': |
387 | Lflag = 0; |
388 | lflag = qflag = 1; |
389 | break; |
390 | case 'm': |
391 | mflag = 1; |
392 | mlimit = mcount = strtonum(optarg, 0, LLONG_MAX9223372036854775807LL, |
393 | &errstr); |
394 | if (errstr != NULL((void*)0)) |
395 | errx(2, "invalid max-count %s: %s", |
396 | optarg, errstr); |
397 | break; |
398 | case 'n': |
399 | nflag = 1; |
400 | break; |
401 | case 'o': |
402 | oflag = 1; |
403 | break; |
404 | case 'q': |
405 | qflag = 1; |
406 | break; |
407 | case 's': |
408 | sflag = 1; |
409 | break; |
410 | case 'v': |
411 | vflag = 1; |
412 | break; |
413 | case 'w': |
414 | wflag = 1; |
415 | break; |
416 | case 'x': |
417 | xflag = 1; |
418 | break; |
419 | case BIN_OPT: |
420 | if (strcmp("binary", optarg) == 0) |
421 | binbehave = BIN_FILE_BIN0; |
422 | else if (strcmp("without-match", optarg) == 0) |
423 | binbehave = BIN_FILE_SKIP1; |
424 | else if (strcmp("text", optarg) == 0) |
425 | binbehave = BIN_FILE_TEXT2; |
426 | else |
427 | errx(2, "Unknown binary-files option"); |
428 | break; |
429 | case 'u': |
430 | case MMAP_OPT: |
431 | /* default, compatibility */ |
432 | break; |
433 | case LABEL_OPT: |
434 | labelname = optarg; |
435 | break; |
436 | case LINEBUF_OPT: |
437 | lbflag = 1; |
438 | break; |
439 | case HELP_OPT: |
440 | default: |
441 | usage(); |
442 | } |
443 | lastc = c; |
444 | newarg = optind != prevoptind; |
445 | prevoptind = optind; |
446 | } |
447 | argc -= optind; |
448 | argv += optind; |
449 | |
450 | for (i = 0; i < exprs; i++) |
451 | add_patterns(expr[i]); |
452 | free(expr); |
453 | expr = NULL((void*)0); |
454 | |
455 | for (patfile = SLIST_FIRST(&patfilelh)((&patfilelh)->slh_first); patfile != NULL((void*)0); |
456 | patfile = pf_next) { |
457 | pf_next = SLIST_NEXT(patfile, pf_next)((patfile)->pf_next.sle_next); |
458 | read_patterns(patfile->pf_file); |
459 | free(patfile); |
460 | } |
461 | |
462 | if (argc == 0 && needpattern) |
463 | usage(); |
464 | |
465 | if (argc != 0 && needpattern) { |
466 | add_patterns(*argv); |
467 | --argc; |
468 | ++argv; |
469 | } |
470 | if (argc == 1 && strcmp(*argv, "-") == 0) { |
471 | /* stdin */ |
472 | --argc; |
473 | ++argv; |
474 | } |
475 | |
476 | if (Eflag) |
477 | cflags |= REG_EXTENDED0001; |
478 | if (Fflag) |
479 | cflags |= REG_NOSPEC0020; |
480 | #ifdef SMALL |
481 | /* Sorry, this won't work */ |
482 | if (Fflag && wflag) |
483 | errx(1, "Can't use small fgrep with -w"); |
484 | #endif |
485 | fg_pattern = grep_calloc(patterns, sizeof(*fg_pattern)); |
486 | r_pattern = grep_calloc(patterns, sizeof(*r_pattern)); |
487 | for (i = 0; i < patterns; ++i) { |
488 | /* Check if cheating is allowed (always is for fgrep). */ |
489 | #ifndef SMALL |
490 | if (Fflag) { |
491 | fgrepcomp(&fg_pattern[i], pattern[i]); |
492 | } else |
493 | #endif |
494 | { |
495 | if (fastcomp(&fg_pattern[i], pattern[i])) { |
496 | /* Fall back to full regex library */ |
497 | c = regcomp(&r_pattern[i], pattern[i], cflags); |
498 | if (c != 0) { |
499 | regerror(c, &r_pattern[i], re_error, |
500 | RE_ERROR_BUF512); |
501 | errx(2, "%s", re_error); |
502 | } |
503 | } |
504 | } |
505 | } |
506 | |
507 | if (lbflag) |
508 | setvbuf(stdout(&__sF[1]), NULL((void*)0), _IOLBF1, 0); |
509 | |
510 | if ((argc == 0 || argc == 1) && !Rflag && !Hflag) |
511 | hflag = 1; |
512 | |
513 | if (argc == 0 && !Rflag) |
514 | exit(!procfile(NULL((void*)0))); |
515 | |
516 | if (Rflag) |
517 | c = grep_tree(argv); |
518 | else |
519 | for (c = 0; argc--; ++argv) |
520 | c |= procfile(*argv); |
521 | |
522 | exit(c ? (file_err ? (qflag ? 0 : 2) : 0) : (file_err ? 2 : 1)); |
523 | } |