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Merge branch 'jt/fetch-nego-tip' into ab/fetch-nego
[alt-git.git] / grep.c
blob45ec7e636c004dbd35d4e0d05c243bc1d1479d19
1 #include "cache.h"
2 #include "config.h"
3 #include "grep.h"
4 #include "userdiff.h"
5 #include "xdiff-interface.h"
6 #include "diff.h"
7 #include "diffcore.h"
8 #include "commit.h"
9 #include "quote.h"
10
11 static int grep_source_load(struct grep_source *gs);
12 static int grep_source_is_binary(struct grep_source *gs);
13
14 static struct grep_opt grep_defaults;
15
16 static void std_output(struct grep_opt *opt, const void *buf, size_t size)
17 {
18 fwrite(buf, size, 1, stdout);
19 }
20
21 static void color_set(char *dst, const char *color_bytes)
22 {
23 xsnprintf(dst, COLOR_MAXLEN, "%s", color_bytes);
24 }
25
26 /*
27 * Initialize the grep_defaults template with hardcoded defaults.
28 * We could let the compiler do this, but without C99 initializers
29 * the code gets unwieldy and unreadable, so...
30 */
31 void init_grep_defaults(void)
32 {
33 struct grep_opt *opt = &grep_defaults;
34 static int run_once;
35
36 if (run_once)
37 return;
38 run_once++;
39
40 memset(opt, 0, sizeof(*opt));
41 opt->relative = 1;
42 opt->pathname = 1;
43 opt->max_depth = -1;
44 opt->pattern_type_option = GREP_PATTERN_TYPE_UNSPECIFIED;
45 color_set(opt->color_context, "");
46 color_set(opt->color_filename, "");
47 color_set(opt->color_function, "");
48 color_set(opt->color_lineno, "");
49 color_set(opt->color_match_context, GIT_COLOR_BOLD_RED);
50 color_set(opt->color_match_selected, GIT_COLOR_BOLD_RED);
51 color_set(opt->color_selected, "");
52 color_set(opt->color_sep, GIT_COLOR_CYAN);
53 opt->color = -1;
54 opt->output = std_output;
55 }
56
57 static int parse_pattern_type_arg(const char *opt, const char *arg)
58 {
59 if (!strcmp(arg, "default"))
60 return GREP_PATTERN_TYPE_UNSPECIFIED;
61 else if (!strcmp(arg, "basic"))
62 return GREP_PATTERN_TYPE_BRE;
63 else if (!strcmp(arg, "extended"))
64 return GREP_PATTERN_TYPE_ERE;
65 else if (!strcmp(arg, "fixed"))
66 return GREP_PATTERN_TYPE_FIXED;
67 else if (!strcmp(arg, "perl"))
68 return GREP_PATTERN_TYPE_PCRE;
69 die("bad %s argument: %s", opt, arg);
70 }
71
72 /*
73 * Read the configuration file once and store it in
74 * the grep_defaults template.
75 */
76 int grep_config(const char *var, const char *value, void *cb)
77 {
78 struct grep_opt *opt = &grep_defaults;
79 char *color = NULL;
80
81 if (userdiff_config(var, value) < 0)
82 return -1;
83
84 if (!strcmp(var, "grep.extendedregexp")) {
85 opt->extended_regexp_option = git_config_bool(var, value);
86 return 0;
87 }
88
89 if (!strcmp(var, "grep.patterntype")) {
90 opt->pattern_type_option = parse_pattern_type_arg(var, value);
91 return 0;
92 }
93
94 if (!strcmp(var, "grep.linenumber")) {
95 opt->linenum = git_config_bool(var, value);
96 return 0;
97 }
98
99 if (!strcmp(var, "grep.fullname")) {
100 opt->relative = !git_config_bool(var, value);
101 return 0;
102 }
103
104 if (!strcmp(var, "color.grep"))
105 opt->color = git_config_colorbool(var, value);
106 else if (!strcmp(var, "color.grep.context"))
107 color = opt->color_context;
108 else if (!strcmp(var, "color.grep.filename"))
109 color = opt->color_filename;
110 else if (!strcmp(var, "color.grep.function"))
111 color = opt->color_function;
112 else if (!strcmp(var, "color.grep.linenumber"))
113 color = opt->color_lineno;
114 else if (!strcmp(var, "color.grep.matchcontext"))
115 color = opt->color_match_context;
116 else if (!strcmp(var, "color.grep.matchselected"))
117 color = opt->color_match_selected;
118 else if (!strcmp(var, "color.grep.selected"))
119 color = opt->color_selected;
120 else if (!strcmp(var, "color.grep.separator"))
121 color = opt->color_sep;
122 else if (!strcmp(var, "color.grep.match")) {
123 int rc = 0;
124 if (!value)
125 return config_error_nonbool(var);
126 rc |= color_parse(value, opt->color_match_context);
127 rc |= color_parse(value, opt->color_match_selected);
128 return rc;
129 }
130
131 if (color) {
132 if (!value)
133 return config_error_nonbool(var);
134 return color_parse(value, color);
135 }
136 return 0;
137 }
138
139 /*
140 * Initialize one instance of grep_opt and copy the
141 * default values from the template we read the configuration
142 * information in an earlier call to git_config(grep_config).
143 */
144 void grep_init(struct grep_opt *opt, const char *prefix)
145 {
146 struct grep_opt *def = &grep_defaults;
147
148 memset(opt, 0, sizeof(*opt));
149 opt->prefix = prefix;
150 opt->prefix_length = (prefix && *prefix) ? strlen(prefix) : 0;
151 opt->pattern_tail = &opt->pattern_list;
152 opt->header_tail = &opt->header_list;
153
154 opt->color = def->color;
155 opt->extended_regexp_option = def->extended_regexp_option;
156 opt->pattern_type_option = def->pattern_type_option;
157 opt->linenum = def->linenum;
158 opt->max_depth = def->max_depth;
159 opt->pathname = def->pathname;
160 opt->relative = def->relative;
161 opt->output = def->output;
162
163 color_set(opt->color_context, def->color_context);
164 color_set(opt->color_filename, def->color_filename);
165 color_set(opt->color_function, def->color_function);
166 color_set(opt->color_lineno, def->color_lineno);
167 color_set(opt->color_match_context, def->color_match_context);
168 color_set(opt->color_match_selected, def->color_match_selected);
169 color_set(opt->color_selected, def->color_selected);
170 color_set(opt->color_sep, def->color_sep);
171 }
172
173 static void grep_set_pattern_type_option(enum grep_pattern_type pattern_type, struct grep_opt *opt)
174 {
175 /*
176 * When committing to the pattern type by setting the relevant
177 * fields in grep_opt it's generally not necessary to zero out
178 * the fields we're not choosing, since they won't have been
179 * set by anything. The extended_regexp_option field is the
180 * only exception to this.
181 *
182 * This is because in the process of parsing grep.patternType
183 * & grep.extendedRegexp we set opt->pattern_type_option and
184 * opt->extended_regexp_option, respectively. We then
185 * internally use opt->extended_regexp_option to see if we're
186 * compiling an ERE. It must be unset if that's not actually
187 * the case.
188 */
189 if (pattern_type != GREP_PATTERN_TYPE_ERE &&
190 opt->extended_regexp_option)
191 opt->extended_regexp_option = 0;
192
193 switch (pattern_type) {
194 case GREP_PATTERN_TYPE_UNSPECIFIED:
195 /* fall through */
196
197 case GREP_PATTERN_TYPE_BRE:
198 break;
199
200 case GREP_PATTERN_TYPE_ERE:
201 opt->extended_regexp_option = 1;
202 break;
203
204 case GREP_PATTERN_TYPE_FIXED:
205 opt->fixed = 1;
206 break;
207
208 case GREP_PATTERN_TYPE_PCRE:
209 #ifdef USE_LIBPCRE2
210 opt->pcre2 = 1;
211 #else
212 /*
213 * It's important that pcre1 always be assigned to
214 * even when there's no USE_LIBPCRE* defined. We still
215 * call the PCRE stub function, it just dies with
216 * "cannot use Perl-compatible regexes[...]".
217 */
218 opt->pcre1 = 1;
219 #endif
220 break;
221 }
222 }
223
224 void grep_commit_pattern_type(enum grep_pattern_type pattern_type, struct grep_opt *opt)
225 {
226 if (pattern_type != GREP_PATTERN_TYPE_UNSPECIFIED)
227 grep_set_pattern_type_option(pattern_type, opt);
228 else if (opt->pattern_type_option != GREP_PATTERN_TYPE_UNSPECIFIED)
229 grep_set_pattern_type_option(opt->pattern_type_option, opt);
230 else if (opt->extended_regexp_option)
231 /*
232 * This branch *must* happen after setting from the
233 * opt->pattern_type_option above, we don't want
234 * grep.extendedRegexp to override grep.patternType!
235 */
236 grep_set_pattern_type_option(GREP_PATTERN_TYPE_ERE, opt);
237 }
238
239 static struct grep_pat *create_grep_pat(const char *pat, size_t patlen,
240 const char *origin, int no,
241 enum grep_pat_token t,
242 enum grep_header_field field)
243 {
244 struct grep_pat *p = xcalloc(1, sizeof(*p));
245 p->pattern = xmemdupz(pat, patlen);
246 p->patternlen = patlen;
247 p->origin = origin;
248 p->no = no;
249 p->token = t;
250 p->field = field;
251 return p;
252 }
253
254 static void do_append_grep_pat(struct grep_pat ***tail, struct grep_pat *p)
255 {
256 **tail = p;
257 *tail = &p->next;
258 p->next = NULL;
259
260 switch (p->token) {
261 case GREP_PATTERN: /* atom */
262 case GREP_PATTERN_HEAD:
263 case GREP_PATTERN_BODY:
264 for (;;) {
265 struct grep_pat *new_pat;
266 size_t len = 0;
267 char *cp = p->pattern + p->patternlen, *nl = NULL;
268 while (++len <= p->patternlen) {
269 if (*(--cp) == '\n') {
270 nl = cp;
271 break;
272 }
273 }
274 if (!nl)
275 break;
276 new_pat = create_grep_pat(nl + 1, len - 1, p->origin,
277 p->no, p->token, p->field);
278 new_pat->next = p->next;
279 if (!p->next)
280 *tail = &new_pat->next;
281 p->next = new_pat;
282 *nl = '\0';
283 p->patternlen -= len;
284 }
285 break;
286 default:
287 break;
288 }
289 }
290
291 void append_header_grep_pattern(struct grep_opt *opt,
292 enum grep_header_field field, const char *pat)
293 {
294 struct grep_pat *p = create_grep_pat(pat, strlen(pat), "header", 0,
295 GREP_PATTERN_HEAD, field);
296 if (field == GREP_HEADER_REFLOG)
297 opt->use_reflog_filter = 1;
298 do_append_grep_pat(&opt->header_tail, p);
299 }
300
301 void append_grep_pattern(struct grep_opt *opt, const char *pat,
302 const char *origin, int no, enum grep_pat_token t)
303 {
304 append_grep_pat(opt, pat, strlen(pat), origin, no, t);
305 }
306
307 void append_grep_pat(struct grep_opt *opt, const char *pat, size_t patlen,
308 const char *origin, int no, enum grep_pat_token t)
309 {
310 struct grep_pat *p = create_grep_pat(pat, patlen, origin, no, t, 0);
311 do_append_grep_pat(&opt->pattern_tail, p);
312 }
313
314 struct grep_opt *grep_opt_dup(const struct grep_opt *opt)
315 {
316 struct grep_pat *pat;
317 struct grep_opt *ret = xmalloc(sizeof(struct grep_opt));
318 *ret = *opt;
319
320 ret->pattern_list = NULL;
321 ret->pattern_tail = &ret->pattern_list;
322
323 for(pat = opt->pattern_list; pat != NULL; pat = pat->next)
324 {
325 if(pat->token == GREP_PATTERN_HEAD)
326 append_header_grep_pattern(ret, pat->field,
327 pat->pattern);
328 else
329 append_grep_pat(ret, pat->pattern, pat->patternlen,
330 pat->origin, pat->no, pat->token);
331 }
332
333 return ret;
334 }
335
336 static NORETURN void compile_regexp_failed(const struct grep_pat *p,
337 const char *error)
338 {
339 char where[1024];
340
341 if (p->no)
342 xsnprintf(where, sizeof(where), "In '%s' at %d, ", p->origin, p->no);
343 else if (p->origin)
344 xsnprintf(where, sizeof(where), "%s, ", p->origin);
345 else
346 where[0] = 0;
347
348 die("%s'%s': %s", where, p->pattern, error);
349 }
350
351 static int is_fixed(const char *s, size_t len)
352 {
353 size_t i;
354
355 for (i = 0; i < len; i++) {
356 if (is_regex_special(s[i]))
357 return 0;
358 }
359
360 return 1;
361 }
362
363 static int has_null(const char *s, size_t len)
364 {
365 /*
366 * regcomp cannot accept patterns with NULs so when using it
367 * we consider any pattern containing a NUL fixed.
368 */
369 if (memchr(s, 0, len))
370 return 1;
371
372 return 0;
373 }
374
375 #ifdef USE_LIBPCRE1
376 static void compile_pcre1_regexp(struct grep_pat *p, const struct grep_opt *opt)
377 {
378 const char *error;
379 int erroffset;
380 int options = PCRE_MULTILINE;
381
382 if (opt->ignore_case) {
383 if (has_non_ascii(p->pattern))
384 p->pcre1_tables = pcre_maketables();
385 options |= PCRE_CASELESS;
386 }
387 if (is_utf8_locale() && has_non_ascii(p->pattern))
388 options |= PCRE_UTF8;
389
390 p->pcre1_regexp = pcre_compile(p->pattern, options, &error, &erroffset,
391 p->pcre1_tables);
392 if (!p->pcre1_regexp)
393 compile_regexp_failed(p, error);
394
395 p->pcre1_extra_info = pcre_study(p->pcre1_regexp, GIT_PCRE_STUDY_JIT_COMPILE, &error);
396 if (!p->pcre1_extra_info && error)
397 die("%s", error);
398
399 #ifdef GIT_PCRE1_USE_JIT
400 pcre_config(PCRE_CONFIG_JIT, &p->pcre1_jit_on);
401 if (p->pcre1_jit_on == 1) {
402 p->pcre1_jit_stack = pcre_jit_stack_alloc(1, 1024 * 1024);
403 if (!p->pcre1_jit_stack)
404 die("Couldn't allocate PCRE JIT stack");
405 pcre_assign_jit_stack(p->pcre1_extra_info, NULL, p->pcre1_jit_stack);
406 } else if (p->pcre1_jit_on != 0) {
407 BUG("The pcre1_jit_on variable should be 0 or 1, not %d",
408 p->pcre1_jit_on);
409 }
410 #endif
411 }
412
413 static int pcre1match(struct grep_pat *p, const char *line, const char *eol,
414 regmatch_t *match, int eflags)
415 {
416 int ovector[30], ret, flags = 0;
417
418 if (eflags & REG_NOTBOL)
419 flags |= PCRE_NOTBOL;
420
421 #ifdef GIT_PCRE1_USE_JIT
422 if (p->pcre1_jit_on) {
423 ret = pcre_jit_exec(p->pcre1_regexp, p->pcre1_extra_info, line,
424 eol - line, 0, flags, ovector,
425 ARRAY_SIZE(ovector), p->pcre1_jit_stack);
426 } else
427 #endif
428 {
429 ret = pcre_exec(p->pcre1_regexp, p->pcre1_extra_info, line,
430 eol - line, 0, flags, ovector,
431 ARRAY_SIZE(ovector));
432 }
433
434 if (ret < 0 && ret != PCRE_ERROR_NOMATCH)
435 die("pcre_exec failed with error code %d", ret);
436 if (ret > 0) {
437 ret = 0;
438 match->rm_so = ovector[0];
439 match->rm_eo = ovector[1];
440 }
441
442 return ret;
443 }
444
445 static void free_pcre1_regexp(struct grep_pat *p)
446 {
447 pcre_free(p->pcre1_regexp);
448 #ifdef GIT_PCRE1_USE_JIT
449 if (p->pcre1_jit_on) {
450 pcre_free_study(p->pcre1_extra_info);
451 pcre_jit_stack_free(p->pcre1_jit_stack);
452 } else
453 #endif
454 {
455 pcre_free(p->pcre1_extra_info);
456 }
457 pcre_free((void *)p->pcre1_tables);
458 }
459 #else /* !USE_LIBPCRE1 */
460 static void compile_pcre1_regexp(struct grep_pat *p, const struct grep_opt *opt)
461 {
462 die("cannot use Perl-compatible regexes when not compiled with USE_LIBPCRE");
463 }
464
465 static int pcre1match(struct grep_pat *p, const char *line, const char *eol,
466 regmatch_t *match, int eflags)
467 {
468 return 1;
469 }
470
471 static void free_pcre1_regexp(struct grep_pat *p)
472 {
473 }
474 #endif /* !USE_LIBPCRE1 */
475
476 #ifdef USE_LIBPCRE2
477 static void compile_pcre2_pattern(struct grep_pat *p, const struct grep_opt *opt)
478 {
479 int error;
480 PCRE2_UCHAR errbuf[256];
481 PCRE2_SIZE erroffset;
482 int options = PCRE2_MULTILINE;
483 const uint8_t *character_tables = NULL;
484 int jitret;
485 int patinforet;
486 size_t jitsizearg;
487
488 assert(opt->pcre2);
489
490 p->pcre2_compile_context = NULL;
491
492 if (opt->ignore_case) {
493 if (has_non_ascii(p->pattern)) {
494 character_tables = pcre2_maketables(NULL);
495 p->pcre2_compile_context = pcre2_compile_context_create(NULL);
496 pcre2_set_character_tables(p->pcre2_compile_context, character_tables);
497 }
498 options |= PCRE2_CASELESS;
499 }
500 if (is_utf8_locale() && has_non_ascii(p->pattern))
501 options |= PCRE2_UTF;
502
503 p->pcre2_pattern = pcre2_compile((PCRE2_SPTR)p->pattern,
504 p->patternlen, options, &error, &erroffset,
505 p->pcre2_compile_context);
506
507 if (p->pcre2_pattern) {
508 p->pcre2_match_data = pcre2_match_data_create_from_pattern(p->pcre2_pattern, NULL);
509 if (!p->pcre2_match_data)
510 die("Couldn't allocate PCRE2 match data");
511 } else {
512 pcre2_get_error_message(error, errbuf, sizeof(errbuf));
513 compile_regexp_failed(p, (const char *)&errbuf);
514 }
515
516 pcre2_config(PCRE2_CONFIG_JIT, &p->pcre2_jit_on);
517 if (p->pcre2_jit_on == 1) {
518 jitret = pcre2_jit_compile(p->pcre2_pattern, PCRE2_JIT_COMPLETE);
519 if (jitret)
520 die("Couldn't JIT the PCRE2 pattern '%s', got '%d'\n", p->pattern, jitret);
521
522 /*
523 * The pcre2_config(PCRE2_CONFIG_JIT, ...) call just
524 * tells us whether the library itself supports JIT,
525 * but to see whether we're going to be actually using
526 * JIT we need to extract PCRE2_INFO_JITSIZE from the
527 * pattern *after* we do pcre2_jit_compile() above.
528 *
529 * This is because if the pattern contains the
530 * (*NO_JIT) verb (see pcre2syntax(3))
531 * pcre2_jit_compile() will exit early with 0. If we
532 * then proceed to call pcre2_jit_match() further down
533 * the line instead of pcre2_match() we'll either
534 * segfault (pre PCRE 10.31) or run into a fatal error
535 * (post PCRE2 10.31)
536 */
537 patinforet = pcre2_pattern_info(p->pcre2_pattern, PCRE2_INFO_JITSIZE, &jitsizearg);
538 if (patinforet)
539 BUG("pcre2_pattern_info() failed: %d", patinforet);
540 if (jitsizearg == 0) {
541 p->pcre2_jit_on = 0;
542 return;
543 }
544
545 p->pcre2_jit_stack = pcre2_jit_stack_create(1, 1024 * 1024, NULL);
546 if (!p->pcre2_jit_stack)
547 die("Couldn't allocate PCRE2 JIT stack");
548 p->pcre2_match_context = pcre2_match_context_create(NULL);
549 if (!p->pcre2_match_context)
550 die("Couldn't allocate PCRE2 match context");
551 pcre2_jit_stack_assign(p->pcre2_match_context, NULL, p->pcre2_jit_stack);
552 } else if (p->pcre2_jit_on != 0) {
553 BUG("The pcre2_jit_on variable should be 0 or 1, not %d",
554 p->pcre1_jit_on);
555 }
556 }
557
558 static int pcre2match(struct grep_pat *p, const char *line, const char *eol,
559 regmatch_t *match, int eflags)
560 {
561 int ret, flags = 0;
562 PCRE2_SIZE *ovector;
563 PCRE2_UCHAR errbuf[256];
564
565 if (eflags & REG_NOTBOL)
566 flags |= PCRE2_NOTBOL;
567
568 if (p->pcre2_jit_on)
569 ret = pcre2_jit_match(p->pcre2_pattern, (unsigned char *)line,
570 eol - line, 0, flags, p->pcre2_match_data,
571 NULL);
572 else
573 ret = pcre2_match(p->pcre2_pattern, (unsigned char *)line,
574 eol - line, 0, flags, p->pcre2_match_data,
575 NULL);
576
577 if (ret < 0 && ret != PCRE2_ERROR_NOMATCH) {
578 pcre2_get_error_message(ret, errbuf, sizeof(errbuf));
579 die("%s failed with error code %d: %s",
580 (p->pcre2_jit_on ? "pcre2_jit_match" : "pcre2_match"), ret,
581 errbuf);
582 }
583 if (ret > 0) {
584 ovector = pcre2_get_ovector_pointer(p->pcre2_match_data);
585 ret = 0;
586 match->rm_so = (int)ovector[0];
587 match->rm_eo = (int)ovector[1];
588 }
589
590 return ret;
591 }
592
593 static void free_pcre2_pattern(struct grep_pat *p)
594 {
595 pcre2_compile_context_free(p->pcre2_compile_context);
596 pcre2_code_free(p->pcre2_pattern);
597 pcre2_match_data_free(p->pcre2_match_data);
598 pcre2_jit_stack_free(p->pcre2_jit_stack);
599 pcre2_match_context_free(p->pcre2_match_context);
600 }
601 #else /* !USE_LIBPCRE2 */
602 static void compile_pcre2_pattern(struct grep_pat *p, const struct grep_opt *opt)
603 {
604 /*
605 * Unreachable until USE_LIBPCRE2 becomes synonymous with
606 * USE_LIBPCRE. See the sibling comment in
607 * grep_set_pattern_type_option().
608 */
609 die("cannot use Perl-compatible regexes when not compiled with USE_LIBPCRE");
610 }
611
612 static int pcre2match(struct grep_pat *p, const char *line, const char *eol,
613 regmatch_t *match, int eflags)
614 {
615 return 1;
616 }
617
618 static void free_pcre2_pattern(struct grep_pat *p)
619 {
620 }
621 #endif /* !USE_LIBPCRE2 */
622
623 static void compile_fixed_regexp(struct grep_pat *p, struct grep_opt *opt)
624 {
625 struct strbuf sb = STRBUF_INIT;
626 int err;
627 int regflags = 0;
628
629 basic_regex_quote_buf(&sb, p->pattern);
630 if (opt->ignore_case)
631 regflags |= REG_ICASE;
632 err = regcomp(&p->regexp, sb.buf, regflags);
633 if (opt->debug)
634 fprintf(stderr, "fixed %s\n", sb.buf);
635 strbuf_release(&sb);
636 if (err) {
637 char errbuf[1024];
638 regerror(err, &p->regexp, errbuf, sizeof(errbuf));
639 compile_regexp_failed(p, errbuf);
640 }
641 }
642
643 static void compile_regexp(struct grep_pat *p, struct grep_opt *opt)
644 {
645 int ascii_only;
646 int err;
647 int regflags = REG_NEWLINE;
648
649 p->word_regexp = opt->word_regexp;
650 p->ignore_case = opt->ignore_case;
651 ascii_only = !has_non_ascii(p->pattern);
652
653 /*
654 * Even when -F (fixed) asks us to do a non-regexp search, we
655 * may not be able to correctly case-fold when -i
656 * (ignore-case) is asked (in which case, we'll synthesize a
657 * regexp to match the pattern that matches regexp special
658 * characters literally, while ignoring case differences). On
659 * the other hand, even without -F, if the pattern does not
660 * have any regexp special characters and there is no need for
661 * case-folding search, we can internally turn it into a
662 * simple string match using kws. p->fixed tells us if we
663 * want to use kws.
664 */
665 if (opt->fixed ||
666 has_null(p->pattern, p->patternlen) ||
667 is_fixed(p->pattern, p->patternlen))
668 p->fixed = !p->ignore_case || ascii_only;
669
670 if (p->fixed) {
671 p->kws = kwsalloc(p->ignore_case ? tolower_trans_tbl : NULL);
672 kwsincr(p->kws, p->pattern, p->patternlen);
673 kwsprep(p->kws);
674 return;
675 } else if (opt->fixed) {
676 /*
677 * We come here when the pattern has the non-ascii
678 * characters we cannot case-fold, and asked to
679 * ignore-case.
680 */
681 compile_fixed_regexp(p, opt);
682 return;
683 }
684
685 if (opt->pcre2) {
686 compile_pcre2_pattern(p, opt);
687 return;
688 }
689
690 if (opt->pcre1) {
691 compile_pcre1_regexp(p, opt);
692 return;
693 }
694
695 if (p->ignore_case)
696 regflags |= REG_ICASE;
697 if (opt->extended_regexp_option)
698 regflags |= REG_EXTENDED;
699 err = regcomp(&p->regexp, p->pattern, regflags);
700 if (err) {
701 char errbuf[1024];
702 regerror(err, &p->regexp, errbuf, 1024);
703 compile_regexp_failed(p, errbuf);
704 }
705 }
706
707 static struct grep_expr *compile_pattern_or(struct grep_pat **);
708 static struct grep_expr *compile_pattern_atom(struct grep_pat **list)
709 {
710 struct grep_pat *p;
711 struct grep_expr *x;
712
713 p = *list;
714 if (!p)
715 return NULL;
716 switch (p->token) {
717 case GREP_PATTERN: /* atom */
718 case GREP_PATTERN_HEAD:
719 case GREP_PATTERN_BODY:
720 x = xcalloc(1, sizeof (struct grep_expr));
721 x->node = GREP_NODE_ATOM;
722 x->u.atom = p;
723 *list = p->next;
724 return x;
725 case GREP_OPEN_PAREN:
726 *list = p->next;
727 x = compile_pattern_or(list);
728 if (!*list || (*list)->token != GREP_CLOSE_PAREN)
729 die("unmatched parenthesis");
730 *list = (*list)->next;
731 return x;
732 default:
733 return NULL;
734 }
735 }
736
737 static struct grep_expr *compile_pattern_not(struct grep_pat **list)
738 {
739 struct grep_pat *p;
740 struct grep_expr *x;
741
742 p = *list;
743 if (!p)
744 return NULL;
745 switch (p->token) {
746 case GREP_NOT:
747 if (!p->next)
748 die("--not not followed by pattern expression");
749 *list = p->next;
750 x = xcalloc(1, sizeof (struct grep_expr));
751 x->node = GREP_NODE_NOT;
752 x->u.unary = compile_pattern_not(list);
753 if (!x->u.unary)
754 die("--not followed by non pattern expression");
755 return x;
756 default:
757 return compile_pattern_atom(list);
758 }
759 }
760
761 static struct grep_expr *compile_pattern_and(struct grep_pat **list)
762 {
763 struct grep_pat *p;
764 struct grep_expr *x, *y, *z;
765
766 x = compile_pattern_not(list);
767 p = *list;
768 if (p && p->token == GREP_AND) {
769 if (!p->next)
770 die("--and not followed by pattern expression");
771 *list = p->next;
772 y = compile_pattern_and(list);
773 if (!y)
774 die("--and not followed by pattern expression");
775 z = xcalloc(1, sizeof (struct grep_expr));
776 z->node = GREP_NODE_AND;
777 z->u.binary.left = x;
778 z->u.binary.right = y;
779 return z;
780 }
781 return x;
782 }
783
784 static struct grep_expr *compile_pattern_or(struct grep_pat **list)
785 {
786 struct grep_pat *p;
787 struct grep_expr *x, *y, *z;
788
789 x = compile_pattern_and(list);
790 p = *list;
791 if (x && p && p->token != GREP_CLOSE_PAREN) {
792 y = compile_pattern_or(list);
793 if (!y)
794 die("not a pattern expression %s", p->pattern);
795 z = xcalloc(1, sizeof (struct grep_expr));
796 z->node = GREP_NODE_OR;
797 z->u.binary.left = x;
798 z->u.binary.right = y;
799 return z;
800 }
801 return x;
802 }
803
804 static struct grep_expr *compile_pattern_expr(struct grep_pat **list)
805 {
806 return compile_pattern_or(list);
807 }
808
809 static void indent(int in)
810 {
811 while (in-- > 0)
812 fputc(' ', stderr);
813 }
814
815 static void dump_grep_pat(struct grep_pat *p)
816 {
817 switch (p->token) {
818 case GREP_AND: fprintf(stderr, "*and*"); break;
819 case GREP_OPEN_PAREN: fprintf(stderr, "*(*"); break;
820 case GREP_CLOSE_PAREN: fprintf(stderr, "*)*"); break;
821 case GREP_NOT: fprintf(stderr, "*not*"); break;
822 case GREP_OR: fprintf(stderr, "*or*"); break;
823
824 case GREP_PATTERN: fprintf(stderr, "pattern"); break;
825 case GREP_PATTERN_HEAD: fprintf(stderr, "pattern_head"); break;
826 case GREP_PATTERN_BODY: fprintf(stderr, "pattern_body"); break;
827 }
828
829 switch (p->token) {
830 default: break;
831 case GREP_PATTERN_HEAD:
832 fprintf(stderr, "<head %d>", p->field); break;
833 case GREP_PATTERN_BODY:
834 fprintf(stderr, "<body>"); break;
835 }
836 switch (p->token) {
837 default: break;
838 case GREP_PATTERN_HEAD:
839 case GREP_PATTERN_BODY:
840 case GREP_PATTERN:
841 fprintf(stderr, "%.*s", (int)p->patternlen, p->pattern);
842 break;
843 }
844 fputc('\n', stderr);
845 }
846
847 static void dump_grep_expression_1(struct grep_expr *x, int in)
848 {
849 indent(in);
850 switch (x->node) {
851 case GREP_NODE_TRUE:
852 fprintf(stderr, "true\n");
853 break;
854 case GREP_NODE_ATOM:
855 dump_grep_pat(x->u.atom);
856 break;
857 case GREP_NODE_NOT:
858 fprintf(stderr, "(not\n");
859 dump_grep_expression_1(x->u.unary, in+1);
860 indent(in);
861 fprintf(stderr, ")\n");
862 break;
863 case GREP_NODE_AND:
864 fprintf(stderr, "(and\n");
865 dump_grep_expression_1(x->u.binary.left, in+1);
866 dump_grep_expression_1(x->u.binary.right, in+1);
867 indent(in);
868 fprintf(stderr, ")\n");
869 break;
870 case GREP_NODE_OR:
871 fprintf(stderr, "(or\n");
872 dump_grep_expression_1(x->u.binary.left, in+1);
873 dump_grep_expression_1(x->u.binary.right, in+1);
874 indent(in);
875 fprintf(stderr, ")\n");
876 break;
877 }
878 }
879
880 static void dump_grep_expression(struct grep_opt *opt)
881 {
882 struct grep_expr *x = opt->pattern_expression;
883
884 if (opt->all_match)
885 fprintf(stderr, "[all-match]\n");
886 dump_grep_expression_1(x, 0);
887 fflush(NULL);
888 }
889
890 static struct grep_expr *grep_true_expr(void)
891 {
892 struct grep_expr *z = xcalloc(1, sizeof(*z));
893 z->node = GREP_NODE_TRUE;
894 return z;
895 }
896
897 static struct grep_expr *grep_or_expr(struct grep_expr *left, struct grep_expr *right)
898 {
899 struct grep_expr *z = xcalloc(1, sizeof(*z));
900 z->node = GREP_NODE_OR;
901 z->u.binary.left = left;
902 z->u.binary.right = right;
903 return z;
904 }
905
906 static struct grep_expr *prep_header_patterns(struct grep_opt *opt)
907 {
908 struct grep_pat *p;
909 struct grep_expr *header_expr;
910 struct grep_expr *(header_group[GREP_HEADER_FIELD_MAX]);
911 enum grep_header_field fld;
912
913 if (!opt->header_list)
914 return NULL;
915
916 for (p = opt->header_list; p; p = p->next) {
917 if (p->token != GREP_PATTERN_HEAD)
918 BUG("a non-header pattern in grep header list.");
919 if (p->field < GREP_HEADER_FIELD_MIN ||
920 GREP_HEADER_FIELD_MAX <= p->field)
921 BUG("unknown header field %d", p->field);
922 compile_regexp(p, opt);
923 }
924
925 for (fld = 0; fld < GREP_HEADER_FIELD_MAX; fld++)
926 header_group[fld] = NULL;
927
928 for (p = opt->header_list; p; p = p->next) {
929 struct grep_expr *h;
930 struct grep_pat *pp = p;
931
932 h = compile_pattern_atom(&pp);
933 if (!h || pp != p->next)
934 BUG("malformed header expr");
935 if (!header_group[p->field]) {
936 header_group[p->field] = h;
937 continue;
938 }
939 header_group[p->field] = grep_or_expr(h, header_group[p->field]);
940 }
941
942 header_expr = NULL;
943
944 for (fld = 0; fld < GREP_HEADER_FIELD_MAX; fld++) {
945 if (!header_group[fld])
946 continue;
947 if (!header_expr)
948 header_expr = grep_true_expr();
949 header_expr = grep_or_expr(header_group[fld], header_expr);
950 }
951 return header_expr;
952 }
953
954 static struct grep_expr *grep_splice_or(struct grep_expr *x, struct grep_expr *y)
955 {
956 struct grep_expr *z = x;
957
958 while (x) {
959 assert(x->node == GREP_NODE_OR);
960 if (x->u.binary.right &&
961 x->u.binary.right->node == GREP_NODE_TRUE) {
962 x->u.binary.right = y;
963 break;
964 }
965 x = x->u.binary.right;
966 }
967 return z;
968 }
969
970 static void compile_grep_patterns_real(struct grep_opt *opt)
971 {
972 struct grep_pat *p;
973 struct grep_expr *header_expr = prep_header_patterns(opt);
974
975 for (p = opt->pattern_list; p; p = p->next) {
976 switch (p->token) {
977 case GREP_PATTERN: /* atom */
978 case GREP_PATTERN_HEAD:
979 case GREP_PATTERN_BODY:
980 compile_regexp(p, opt);
981 break;
982 default:
983 opt->extended = 1;
984 break;
985 }
986 }
987
988 if (opt->all_match || header_expr)
989 opt->extended = 1;
990 else if (!opt->extended && !opt->debug)
991 return;
992
993 p = opt->pattern_list;
994 if (p)
995 opt->pattern_expression = compile_pattern_expr(&p);
996 if (p)
997 die("incomplete pattern expression: %s", p->pattern);
998
999 if (!header_expr)
1000 return;
1001
1002 if (!opt->pattern_expression)
1003 opt->pattern_expression = header_expr;
1004 else if (opt->all_match)
1005 opt->pattern_expression = grep_splice_or(header_expr,
1006 opt->pattern_expression);
1007 else
1008 opt->pattern_expression = grep_or_expr(opt->pattern_expression,
1009 header_expr);
1010 opt->all_match = 1;
1011 }
1012
1013 void compile_grep_patterns(struct grep_opt *opt)
1014 {
1015 compile_grep_patterns_real(opt);
1016 if (opt->debug)
1017 dump_grep_expression(opt);
1018 }
1019
1020 static void free_pattern_expr(struct grep_expr *x)
1021 {
1022 switch (x->node) {
1023 case GREP_NODE_TRUE:
1024 case GREP_NODE_ATOM:
1025 break;
1026 case GREP_NODE_NOT:
1027 free_pattern_expr(x->u.unary);
1028 break;
1029 case GREP_NODE_AND:
1030 case GREP_NODE_OR:
1031 free_pattern_expr(x->u.binary.left);
1032 free_pattern_expr(x->u.binary.right);
1033 break;
1034 }
1035 free(x);
1036 }
1037
1038 void free_grep_patterns(struct grep_opt *opt)
1039 {
1040 struct grep_pat *p, *n;
1041
1042 for (p = opt->pattern_list; p; p = n) {
1043 n = p->next;
1044 switch (p->token) {
1045 case GREP_PATTERN: /* atom */
1046 case GREP_PATTERN_HEAD:
1047 case GREP_PATTERN_BODY:
1048 if (p->kws)
1049 kwsfree(p->kws);
1050 else if (p->pcre1_regexp)
1051 free_pcre1_regexp(p);
1052 else if (p->pcre2_pattern)
1053 free_pcre2_pattern(p);
1054 else
1055 regfree(&p->regexp);
1056 free(p->pattern);
1057 break;
1058 default:
1059 break;
1060 }
1061 free(p);
1062 }
1063
1064 if (!opt->extended)
1065 return;
1066 free_pattern_expr(opt->pattern_expression);
1067 }
1068
1069 static char *end_of_line(char *cp, unsigned long *left)
1070 {
1071 unsigned long l = *left;
1072 while (l && *cp != '\n') {
1073 l--;
1074 cp++;
1075 }
1076 *left = l;
1077 return cp;
1078 }
1079
1080 static int word_char(char ch)
1081 {
1082 return isalnum(ch) || ch == '_';
1083 }
1084
1085 static void output_color(struct grep_opt *opt, const void *data, size_t size,
1086 const char *color)
1087 {
1088 if (want_color(opt->color) && color && color[0]) {
1089 opt->output(opt, color, strlen(color));
1090 opt->output(opt, data, size);
1091 opt->output(opt, GIT_COLOR_RESET, strlen(GIT_COLOR_RESET));
1092 } else
1093 opt->output(opt, data, size);
1094 }
1095
1096 static void output_sep(struct grep_opt *opt, char sign)
1097 {
1098 if (opt->null_following_name)
1099 opt->output(opt, "\0", 1);
1100 else
1101 output_color(opt, &sign, 1, opt->color_sep);
1102 }
1103
1104 static void show_name(struct grep_opt *opt, const char *name)
1105 {
1106 output_color(opt, name, strlen(name), opt->color_filename);
1107 opt->output(opt, opt->null_following_name ? "\0" : "\n", 1);
1108 }
1109
1110 static int fixmatch(struct grep_pat *p, char *line, char *eol,
1111 regmatch_t *match)
1112 {
1113 struct kwsmatch kwsm;
1114 size_t offset = kwsexec(p->kws, line, eol - line, &kwsm);
1115 if (offset == -1) {
1116 match->rm_so = match->rm_eo = -1;
1117 return REG_NOMATCH;
1118 } else {
1119 match->rm_so = offset;
1120 match->rm_eo = match->rm_so + kwsm.size[0];
1121 return 0;
1122 }
1123 }
1124
1125 static int patmatch(struct grep_pat *p, char *line, char *eol,
1126 regmatch_t *match, int eflags)
1127 {
1128 int hit;
1129
1130 if (p->fixed)
1131 hit = !fixmatch(p, line, eol, match);
1132 else if (p->pcre1_regexp)
1133 hit = !pcre1match(p, line, eol, match, eflags);
1134 else if (p->pcre2_pattern)
1135 hit = !pcre2match(p, line, eol, match, eflags);
1136 else
1137 hit = !regexec_buf(&p->regexp, line, eol - line, 1, match,
1138 eflags);
1139
1140 return hit;
1141 }
1142
1143 static int strip_timestamp(char *bol, char **eol_p)
1144 {
1145 char *eol = *eol_p;
1146 int ch;
1147
1148 while (bol < --eol) {
1149 if (*eol != '>')
1150 continue;
1151 *eol_p = ++eol;
1152 ch = *eol;
1153 *eol = '\0';
1154 return ch;
1155 }
1156 return 0;
1157 }
1158
1159 static struct {
1160 const char *field;
1161 size_t len;
1162 } header_field[] = {
1163 { "author ", 7 },
1164 { "committer ", 10 },
1165 { "reflog ", 7 },
1166 };
1167
1168 static int match_one_pattern(struct grep_pat *p, char *bol, char *eol,
1169 enum grep_context ctx,
1170 regmatch_t *pmatch, int eflags)
1171 {
1172 int hit = 0;
1173 int saved_ch = 0;
1174 const char *start = bol;
1175
1176 if ((p->token != GREP_PATTERN) &&
1177 ((p->token == GREP_PATTERN_HEAD) != (ctx == GREP_CONTEXT_HEAD)))
1178 return 0;
1179
1180 if (p->token == GREP_PATTERN_HEAD) {
1181 const char *field;
1182 size_t len;
1183 assert(p->field < ARRAY_SIZE(header_field));
1184 field = header_field[p->field].field;
1185 len = header_field[p->field].len;
1186 if (strncmp(bol, field, len))
1187 return 0;
1188 bol += len;
1189 switch (p->field) {
1190 case GREP_HEADER_AUTHOR:
1191 case GREP_HEADER_COMMITTER:
1192 saved_ch = strip_timestamp(bol, &eol);
1193 break;
1194 default:
1195 break;
1196 }
1197 }
1198
1199 again:
1200 hit = patmatch(p, bol, eol, pmatch, eflags);
1201
1202 if (hit && p->word_regexp) {
1203 if ((pmatch[0].rm_so < 0) ||
1204 (eol - bol) < pmatch[0].rm_so ||
1205 (pmatch[0].rm_eo < 0) ||
1206 (eol - bol) < pmatch[0].rm_eo)
1207 die("regexp returned nonsense");
1208
1209 /* Match beginning must be either beginning of the
1210 * line, or at word boundary (i.e. the last char must
1211 * not be a word char). Similarly, match end must be
1212 * either end of the line, or at word boundary
1213 * (i.e. the next char must not be a word char).
1214 */
1215 if ( ((pmatch[0].rm_so == 0) ||
1216 !word_char(bol[pmatch[0].rm_so-1])) &&
1217 ((pmatch[0].rm_eo == (eol-bol)) ||
1218 !word_char(bol[pmatch[0].rm_eo])) )
1219 ;
1220 else
1221 hit = 0;
1222
1223 /* Words consist of at least one character. */
1224 if (pmatch->rm_so == pmatch->rm_eo)
1225 hit = 0;
1226
1227 if (!hit && pmatch[0].rm_so + bol + 1 < eol) {
1228 /* There could be more than one match on the
1229 * line, and the first match might not be
1230 * strict word match. But later ones could be!
1231 * Forward to the next possible start, i.e. the
1232 * next position following a non-word char.
1233 */
1234 bol = pmatch[0].rm_so + bol + 1;
1235 while (word_char(bol[-1]) && bol < eol)
1236 bol++;
1237 eflags |= REG_NOTBOL;
1238 if (bol < eol)
1239 goto again;
1240 }
1241 }
1242 if (p->token == GREP_PATTERN_HEAD && saved_ch)
1243 *eol = saved_ch;
1244 if (hit) {
1245 pmatch[0].rm_so += bol - start;
1246 pmatch[0].rm_eo += bol - start;
1247 }
1248 return hit;
1249 }
1250
1251 static int match_expr_eval(struct grep_expr *x, char *bol, char *eol,
1252 enum grep_context ctx, int collect_hits)
1253 {
1254 int h = 0;
1255 regmatch_t match;
1256
1257 if (!x)
1258 die("Not a valid grep expression");
1259 switch (x->node) {
1260 case GREP_NODE_TRUE:
1261 h = 1;
1262 break;
1263 case GREP_NODE_ATOM:
1264 h = match_one_pattern(x->u.atom, bol, eol, ctx, &match, 0);
1265 break;
1266 case GREP_NODE_NOT:
1267 h = !match_expr_eval(x->u.unary, bol, eol, ctx, 0);
1268 break;
1269 case GREP_NODE_AND:
1270 if (!match_expr_eval(x->u.binary.left, bol, eol, ctx, 0))
1271 return 0;
1272 h = match_expr_eval(x->u.binary.right, bol, eol, ctx, 0);
1273 break;
1274 case GREP_NODE_OR:
1275 if (!collect_hits)
1276 return (match_expr_eval(x->u.binary.left,
1277 bol, eol, ctx, 0) ||
1278 match_expr_eval(x->u.binary.right,
1279 bol, eol, ctx, 0));
1280 h = match_expr_eval(x->u.binary.left, bol, eol, ctx, 0);
1281 x->u.binary.left->hit |= h;
1282 h |= match_expr_eval(x->u.binary.right, bol, eol, ctx, 1);
1283 break;
1284 default:
1285 die("Unexpected node type (internal error) %d", x->node);
1286 }
1287 if (collect_hits)
1288 x->hit |= h;
1289 return h;
1290 }
1291
1292 static int match_expr(struct grep_opt *opt, char *bol, char *eol,
1293 enum grep_context ctx, int collect_hits)
1294 {
1295 struct grep_expr *x = opt->pattern_expression;
1296 return match_expr_eval(x, bol, eol, ctx, collect_hits);
1297 }
1298
1299 static int match_line(struct grep_opt *opt, char *bol, char *eol,
1300 enum grep_context ctx, int collect_hits)
1301 {
1302 struct grep_pat *p;
1303 regmatch_t match;
1304
1305 if (opt->extended)
1306 return match_expr(opt, bol, eol, ctx, collect_hits);
1307
1308 /* we do not call with collect_hits without being extended */
1309 for (p = opt->pattern_list; p; p = p->next) {
1310 if (match_one_pattern(p, bol, eol, ctx, &match, 0))
1311 return 1;
1312 }
1313 return 0;
1314 }
1315
1316 static int match_next_pattern(struct grep_pat *p, char *bol, char *eol,
1317 enum grep_context ctx,
1318 regmatch_t *pmatch, int eflags)
1319 {
1320 regmatch_t match;
1321
1322 if (!match_one_pattern(p, bol, eol, ctx, &match, eflags))
1323 return 0;
1324 if (match.rm_so < 0 || match.rm_eo < 0)
1325 return 0;
1326 if (pmatch->rm_so >= 0 && pmatch->rm_eo >= 0) {
1327 if (match.rm_so > pmatch->rm_so)
1328 return 1;
1329 if (match.rm_so == pmatch->rm_so && match.rm_eo < pmatch->rm_eo)
1330 return 1;
1331 }
1332 pmatch->rm_so = match.rm_so;
1333 pmatch->rm_eo = match.rm_eo;
1334 return 1;
1335 }
1336
1337 static int next_match(struct grep_opt *opt, char *bol, char *eol,
1338 enum grep_context ctx, regmatch_t *pmatch, int eflags)
1339 {
1340 struct grep_pat *p;
1341 int hit = 0;
1342
1343 pmatch->rm_so = pmatch->rm_eo = -1;
1344 if (bol < eol) {
1345 for (p = opt->pattern_list; p; p = p->next) {
1346 switch (p->token) {
1347 case GREP_PATTERN: /* atom */
1348 case GREP_PATTERN_HEAD:
1349 case GREP_PATTERN_BODY:
1350 hit |= match_next_pattern(p, bol, eol, ctx,
1351 pmatch, eflags);
1352 break;
1353 default:
1354 break;
1355 }
1356 }
1357 }
1358 return hit;
1359 }
1360
1361 static void show_line(struct grep_opt *opt, char *bol, char *eol,
1362 const char *name, unsigned lno, char sign)
1363 {
1364 int rest = eol - bol;
1365 const char *match_color, *line_color = NULL;
1366
1367 if (opt->file_break && opt->last_shown == 0) {
1368 if (opt->show_hunk_mark)
1369 opt->output(opt, "\n", 1);
1370 } else if (opt->pre_context || opt->post_context || opt->funcbody) {
1371 if (opt->last_shown == 0) {
1372 if (opt->show_hunk_mark) {
1373 output_color(opt, "--", 2, opt->color_sep);
1374 opt->output(opt, "\n", 1);
1375 }
1376 } else if (lno > opt->last_shown + 1) {
1377 output_color(opt, "--", 2, opt->color_sep);
1378 opt->output(opt, "\n", 1);
1379 }
1380 }
1381 if (opt->heading && opt->last_shown == 0) {
1382 output_color(opt, name, strlen(name), opt->color_filename);
1383 opt->output(opt, "\n", 1);
1384 }
1385 opt->last_shown = lno;
1386
1387 if (!opt->heading && opt->pathname) {
1388 output_color(opt, name, strlen(name), opt->color_filename);
1389 output_sep(opt, sign);
1390 }
1391 if (opt->linenum) {
1392 char buf[32];
1393 xsnprintf(buf, sizeof(buf), "%d", lno);
1394 output_color(opt, buf, strlen(buf), opt->color_lineno);
1395 output_sep(opt, sign);
1396 }
1397 if (opt->color) {
1398 regmatch_t match;
1399 enum grep_context ctx = GREP_CONTEXT_BODY;
1400 int ch = *eol;
1401 int eflags = 0;
1402
1403 if (sign == ':')
1404 match_color = opt->color_match_selected;
1405 else
1406 match_color = opt->color_match_context;
1407 if (sign == ':')
1408 line_color = opt->color_selected;
1409 else if (sign == '-')
1410 line_color = opt->color_context;
1411 else if (sign == '=')
1412 line_color = opt->color_function;
1413 *eol = '\0';
1414 while (next_match(opt, bol, eol, ctx, &match, eflags)) {
1415 if (match.rm_so == match.rm_eo)
1416 break;
1417
1418 output_color(opt, bol, match.rm_so, line_color);
1419 output_color(opt, bol + match.rm_so,
1420 match.rm_eo - match.rm_so, match_color);
1421 bol += match.rm_eo;
1422 rest -= match.rm_eo;
1423 eflags = REG_NOTBOL;
1424 }
1425 *eol = ch;
1426 }
1427 output_color(opt, bol, rest, line_color);
1428 opt->output(opt, "\n", 1);
1429 }
1430
1431 #ifndef NO_PTHREADS
1432 int grep_use_locks;
1433
1434 /*
1435 * This lock protects access to the gitattributes machinery, which is
1436 * not thread-safe.
1437 */
1438 pthread_mutex_t grep_attr_mutex;
1439
1440 static inline void grep_attr_lock(void)
1441 {
1442 if (grep_use_locks)
1443 pthread_mutex_lock(&grep_attr_mutex);
1444 }
1445
1446 static inline void grep_attr_unlock(void)
1447 {
1448 if (grep_use_locks)
1449 pthread_mutex_unlock(&grep_attr_mutex);
1450 }
1451
1452 /*
1453 * Same as git_attr_mutex, but protecting the thread-unsafe object db access.
1454 */
1455 pthread_mutex_t grep_read_mutex;
1456
1457 #else
1458 #define grep_attr_lock()
1459 #define grep_attr_unlock()
1460 #endif
1461
1462 static int match_funcname(struct grep_opt *opt, struct grep_source *gs, char *bol, char *eol)
1463 {
1464 xdemitconf_t *xecfg = opt->priv;
1465 if (xecfg && !xecfg->find_func) {
1466 grep_source_load_driver(gs);
1467 if (gs->driver->funcname.pattern) {
1468 const struct userdiff_funcname *pe = &gs->driver->funcname;
1469 xdiff_set_find_func(xecfg, pe->pattern, pe->cflags);
1470 } else {
1471 xecfg = opt->priv = NULL;
1472 }
1473 }
1474
1475 if (xecfg) {
1476 char buf[1];
1477 return xecfg->find_func(bol, eol - bol, buf, 1,
1478 xecfg->find_func_priv) >= 0;
1479 }
1480
1481 if (bol == eol)
1482 return 0;
1483 if (isalpha(*bol) || *bol == '_' || *bol == '$')
1484 return 1;
1485 return 0;
1486 }
1487
1488 static void show_funcname_line(struct grep_opt *opt, struct grep_source *gs,
1489 char *bol, unsigned lno)
1490 {
1491 while (bol > gs->buf) {
1492 char *eol = --bol;
1493
1494 while (bol > gs->buf && bol[-1] != '\n')
1495 bol--;
1496 lno--;
1497
1498 if (lno <= opt->last_shown)
1499 break;
1500
1501 if (match_funcname(opt, gs, bol, eol)) {
1502 show_line(opt, bol, eol, gs->name, lno, '=');
1503 break;
1504 }
1505 }
1506 }
1507
1508 static int is_empty_line(const char *bol, const char *eol);
1509
1510 static void show_pre_context(struct grep_opt *opt, struct grep_source *gs,
1511 char *bol, char *end, unsigned lno)
1512 {
1513 unsigned cur = lno, from = 1, funcname_lno = 0, orig_from;
1514 int funcname_needed = !!opt->funcname, comment_needed = 0;
1515
1516 if (opt->pre_context < lno)
1517 from = lno - opt->pre_context;
1518 if (from <= opt->last_shown)
1519 from = opt->last_shown + 1;
1520 orig_from = from;
1521 if (opt->funcbody) {
1522 if (match_funcname(opt, gs, bol, end))
1523 comment_needed = 1;
1524 else
1525 funcname_needed = 1;
1526 from = opt->last_shown + 1;
1527 }
1528
1529 /* Rewind. */
1530 while (bol > gs->buf && cur > from) {
1531 char *next_bol = bol;
1532 char *eol = --bol;
1533
1534 while (bol > gs->buf && bol[-1] != '\n')
1535 bol--;
1536 cur--;
1537 if (comment_needed && (is_empty_line(bol, eol) ||
1538 match_funcname(opt, gs, bol, eol))) {
1539 comment_needed = 0;
1540 from = orig_from;
1541 if (cur < from) {
1542 cur++;
1543 bol = next_bol;
1544 break;
1545 }
1546 }
1547 if (funcname_needed && match_funcname(opt, gs, bol, eol)) {
1548 funcname_lno = cur;
1549 funcname_needed = 0;
1550 if (opt->funcbody)
1551 comment_needed = 1;
1552 else
1553 from = orig_from;
1554 }
1555 }
1556
1557 /* We need to look even further back to find a function signature. */
1558 if (opt->funcname && funcname_needed)
1559 show_funcname_line(opt, gs, bol, cur);
1560
1561 /* Back forward. */
1562 while (cur < lno) {
1563 char *eol = bol, sign = (cur == funcname_lno) ? '=' : '-';
1564
1565 while (*eol != '\n')
1566 eol++;
1567 show_line(opt, bol, eol, gs->name, cur, sign);
1568 bol = eol + 1;
1569 cur++;
1570 }
1571 }
1572
1573 static int should_lookahead(struct grep_opt *opt)
1574 {
1575 struct grep_pat *p;
1576
1577 if (opt->extended)
1578 return 0; /* punt for too complex stuff */
1579 if (opt->invert)
1580 return 0;
1581 for (p = opt->pattern_list; p; p = p->next) {
1582 if (p->token != GREP_PATTERN)
1583 return 0; /* punt for "header only" and stuff */
1584 }
1585 return 1;
1586 }
1587
1588 static int look_ahead(struct grep_opt *opt,
1589 unsigned long *left_p,
1590 unsigned *lno_p,
1591 char **bol_p)
1592 {
1593 unsigned lno = *lno_p;
1594 char *bol = *bol_p;
1595 struct grep_pat *p;
1596 char *sp, *last_bol;
1597 regoff_t earliest = -1;
1598
1599 for (p = opt->pattern_list; p; p = p->next) {
1600 int hit;
1601 regmatch_t m;
1602
1603 hit = patmatch(p, bol, bol + *left_p, &m, 0);
1604 if (!hit || m.rm_so < 0 || m.rm_eo < 0)
1605 continue;
1606 if (earliest < 0 || m.rm_so < earliest)
1607 earliest = m.rm_so;
1608 }
1609
1610 if (earliest < 0) {
1611 *bol_p = bol + *left_p;
1612 *left_p = 0;
1613 return 1;
1614 }
1615 for (sp = bol + earliest; bol < sp && sp[-1] != '\n'; sp--)
1616 ; /* find the beginning of the line */
1617 last_bol = sp;
1618
1619 for (sp = bol; sp < last_bol; sp++) {
1620 if (*sp == '\n')
1621 lno++;
1622 }
1623 *left_p -= last_bol - bol;
1624 *bol_p = last_bol;
1625 *lno_p = lno;
1626 return 0;
1627 }
1628
1629 static int fill_textconv_grep(struct userdiff_driver *driver,
1630 struct grep_source *gs)
1631 {
1632 struct diff_filespec *df;
1633 char *buf;
1634 size_t size;
1635
1636 if (!driver || !driver->textconv)
1637 return grep_source_load(gs);
1638
1639 /*
1640 * The textconv interface is intimately tied to diff_filespecs, so we
1641 * have to pretend to be one. If we could unify the grep_source
1642 * and diff_filespec structs, this mess could just go away.
1643 */
1644 df = alloc_filespec(gs->path);
1645 switch (gs->type) {
1646 case GREP_SOURCE_OID:
1647 fill_filespec(df, gs->identifier, 1, 0100644);
1648 break;
1649 case GREP_SOURCE_FILE:
1650 fill_filespec(df, &null_oid, 0, 0100644);
1651 break;
1652 default:
1653 BUG("attempt to textconv something without a path?");
1654 }
1655
1656 /*
1657 * fill_textconv is not remotely thread-safe; it may load objects
1658 * behind the scenes, and it modifies the global diff tempfile
1659 * structure.
1660 */
1661 grep_read_lock();
1662 size = fill_textconv(driver, df, &buf);
1663 grep_read_unlock();
1664 free_filespec(df);
1665
1666 /*
1667 * The normal fill_textconv usage by the diff machinery would just keep
1668 * the textconv'd buf separate from the diff_filespec. But much of the
1669 * grep code passes around a grep_source and assumes that its "buf"
1670 * pointer is the beginning of the thing we are searching. So let's
1671 * install our textconv'd version into the grep_source, taking care not
1672 * to leak any existing buffer.
1673 */
1674 grep_source_clear_data(gs);
1675 gs->buf = buf;
1676 gs->size = size;
1677
1678 return 0;
1679 }
1680
1681 static int is_empty_line(const char *bol, const char *eol)
1682 {
1683 while (bol < eol && isspace(*bol))
1684 bol++;
1685 return bol == eol;
1686 }
1687
1688 static int grep_source_1(struct grep_opt *opt, struct grep_source *gs, int collect_hits)
1689 {
1690 char *bol;
1691 char *peek_bol = NULL;
1692 unsigned long left;
1693 unsigned lno = 1;
1694 unsigned last_hit = 0;
1695 int binary_match_only = 0;
1696 unsigned count = 0;
1697 int try_lookahead = 0;
1698 int show_function = 0;
1699 struct userdiff_driver *textconv = NULL;
1700 enum grep_context ctx = GREP_CONTEXT_HEAD;
1701 xdemitconf_t xecfg;
1702
1703 if (!opt->output)
1704 opt->output = std_output;
1705
1706 if (opt->pre_context || opt->post_context || opt->file_break ||
1707 opt->funcbody) {
1708 /* Show hunk marks, except for the first file. */
1709 if (opt->last_shown)
1710 opt->show_hunk_mark = 1;
1711 /*
1712 * If we're using threads then we can't easily identify
1713 * the first file. Always put hunk marks in that case
1714 * and skip the very first one later in work_done().
1715 */
1716 if (opt->output != std_output)
1717 opt->show_hunk_mark = 1;
1718 }
1719 opt->last_shown = 0;
1720
1721 if (opt->allow_textconv) {
1722 grep_source_load_driver(gs);
1723 /*
1724 * We might set up the shared textconv cache data here, which
1725 * is not thread-safe.
1726 */
1727 grep_attr_lock();
1728 textconv = userdiff_get_textconv(gs->driver);
1729 grep_attr_unlock();
1730 }
1731
1732 /*
1733 * We know the result of a textconv is text, so we only have to care
1734 * about binary handling if we are not using it.
1735 */
1736 if (!textconv) {
1737 switch (opt->binary) {
1738 case GREP_BINARY_DEFAULT:
1739 if (grep_source_is_binary(gs))
1740 binary_match_only = 1;
1741 break;
1742 case GREP_BINARY_NOMATCH:
1743 if (grep_source_is_binary(gs))
1744 return 0; /* Assume unmatch */
1745 break;
1746 case GREP_BINARY_TEXT:
1747 break;
1748 default:
1749 BUG("unknown binary handling mode");
1750 }
1751 }
1752
1753 memset(&xecfg, 0, sizeof(xecfg));
1754 opt->priv = &xecfg;
1755
1756 try_lookahead = should_lookahead(opt);
1757
1758 if (fill_textconv_grep(textconv, gs) < 0)
1759 return 0;
1760
1761 bol = gs->buf;
1762 left = gs->size;
1763 while (left) {
1764 char *eol, ch;
1765 int hit;
1766
1767 /*
1768 * look_ahead() skips quickly to the line that possibly
1769 * has the next hit; don't call it if we need to do
1770 * something more than just skipping the current line
1771 * in response to an unmatch for the current line. E.g.
1772 * inside a post-context window, we will show the current
1773 * line as a context around the previous hit when it
1774 * doesn't hit.
1775 */
1776 if (try_lookahead
1777 && !(last_hit
1778 && (show_function ||
1779 lno <= last_hit + opt->post_context))
1780 && look_ahead(opt, &left, &lno, &bol))
1781 break;
1782 eol = end_of_line(bol, &left);
1783 ch = *eol;
1784 *eol = 0;
1785
1786 if ((ctx == GREP_CONTEXT_HEAD) && (eol == bol))
1787 ctx = GREP_CONTEXT_BODY;
1788
1789 hit = match_line(opt, bol, eol, ctx, collect_hits);
1790 *eol = ch;
1791
1792 if (collect_hits)
1793 goto next_line;
1794
1795 /* "grep -v -e foo -e bla" should list lines
1796 * that do not have either, so inversion should
1797 * be done outside.
1798 */
1799 if (opt->invert)
1800 hit = !hit;
1801 if (opt->unmatch_name_only) {
1802 if (hit)
1803 return 0;
1804 goto next_line;
1805 }
1806 if (hit) {
1807 count++;
1808 if (opt->status_only)
1809 return 1;
1810 if (opt->name_only) {
1811 show_name(opt, gs->name);
1812 return 1;
1813 }
1814 if (opt->count)
1815 goto next_line;
1816 if (binary_match_only) {
1817 opt->output(opt, "Binary file ", 12);
1818 output_color(opt, gs->name, strlen(gs->name),
1819 opt->color_filename);
1820 opt->output(opt, " matches\n", 9);
1821 return 1;
1822 }
1823 /* Hit at this line. If we haven't shown the
1824 * pre-context lines, we would need to show them.
1825 */
1826 if (opt->pre_context || opt->funcbody)
1827 show_pre_context(opt, gs, bol, eol, lno);
1828 else if (opt->funcname)
1829 show_funcname_line(opt, gs, bol, lno);
1830 show_line(opt, bol, eol, gs->name, lno, ':');
1831 last_hit = lno;
1832 if (opt->funcbody)
1833 show_function = 1;
1834 goto next_line;
1835 }
1836 if (show_function && (!peek_bol || peek_bol < bol)) {
1837 unsigned long peek_left = left;
1838 char *peek_eol = eol;
1839
1840 /*
1841 * Trailing empty lines are not interesting.
1842 * Peek past them to see if they belong to the
1843 * body of the current function.
1844 */
1845 peek_bol = bol;
1846 while (is_empty_line(peek_bol, peek_eol)) {
1847 peek_bol = peek_eol + 1;
1848 peek_eol = end_of_line(peek_bol, &peek_left);
1849 }
1850
1851 if (match_funcname(opt, gs, peek_bol, peek_eol))
1852 show_function = 0;
1853 }
1854 if (show_function ||
1855 (last_hit && lno <= last_hit + opt->post_context)) {
1856 /* If the last hit is within the post context,
1857 * we need to show this line.
1858 */
1859 show_line(opt, bol, eol, gs->name, lno, '-');
1860 }
1861
1862 next_line:
1863 bol = eol + 1;
1864 if (!left)
1865 break;
1866 left--;
1867 lno++;
1868 }
1869
1870 if (collect_hits)
1871 return 0;
1872
1873 if (opt->status_only)
1874 return opt->unmatch_name_only;
1875 if (opt->unmatch_name_only) {
1876 /* We did not see any hit, so we want to show this */
1877 show_name(opt, gs->name);
1878 return 1;
1879 }
1880
1881 xdiff_clear_find_func(&xecfg);
1882 opt->priv = NULL;
1883
1884 /* NEEDSWORK:
1885 * The real "grep -c foo *.c" gives many "bar.c:0" lines,
1886 * which feels mostly useless but sometimes useful. Maybe
1887 * make it another option? For now suppress them.
1888 */
1889 if (opt->count && count) {
1890 char buf[32];
1891 if (opt->pathname) {
1892 output_color(opt, gs->name, strlen(gs->name),
1893 opt->color_filename);
1894 output_sep(opt, ':');
1895 }
1896 xsnprintf(buf, sizeof(buf), "%u\n", count);
1897 opt->output(opt, buf, strlen(buf));
1898 return 1;
1899 }
1900 return !!last_hit;
1901 }
1902
1903 static void clr_hit_marker(struct grep_expr *x)
1904 {
1905 /* All-hit markers are meaningful only at the very top level
1906 * OR node.
1907 */
1908 while (1) {
1909 x->hit = 0;
1910 if (x->node != GREP_NODE_OR)
1911 return;
1912 x->u.binary.left->hit = 0;
1913 x = x->u.binary.right;
1914 }
1915 }
1916
1917 static int chk_hit_marker(struct grep_expr *x)
1918 {
1919 /* Top level nodes have hit markers. See if they all are hits */
1920 while (1) {
1921 if (x->node != GREP_NODE_OR)
1922 return x->hit;
1923 if (!x->u.binary.left->hit)
1924 return 0;
1925 x = x->u.binary.right;
1926 }
1927 }
1928
1929 int grep_source(struct grep_opt *opt, struct grep_source *gs)
1930 {
1931 /*
1932 * we do not have to do the two-pass grep when we do not check
1933 * buffer-wide "all-match".
1934 */
1935 if (!opt->all_match)
1936 return grep_source_1(opt, gs, 0);
1937
1938 /* Otherwise the toplevel "or" terms hit a bit differently.
1939 * We first clear hit markers from them.
1940 */
1941 clr_hit_marker(opt->pattern_expression);
1942 grep_source_1(opt, gs, 1);
1943
1944 if (!chk_hit_marker(opt->pattern_expression))
1945 return 0;
1946
1947 return grep_source_1(opt, gs, 0);
1948 }
1949
1950 int grep_buffer(struct grep_opt *opt, char *buf, unsigned long size)
1951 {
1952 struct grep_source gs;
1953 int r;
1954
1955 grep_source_init(&gs, GREP_SOURCE_BUF, NULL, NULL, NULL);
1956 gs.buf = buf;
1957 gs.size = size;
1958
1959 r = grep_source(opt, &gs);
1960
1961 grep_source_clear(&gs);
1962 return r;
1963 }
1964
1965 void grep_source_init(struct grep_source *gs, enum grep_source_type type,
1966 const char *name, const char *path,
1967 const void *identifier)
1968 {
1969 gs->type = type;
1970 gs->name = xstrdup_or_null(name);
1971 gs->path = xstrdup_or_null(path);
1972 gs->buf = NULL;
1973 gs->size = 0;
1974 gs->driver = NULL;
1975
1976 switch (type) {
1977 case GREP_SOURCE_FILE:
1978 gs->identifier = xstrdup(identifier);
1979 break;
1980 case GREP_SOURCE_OID:
1981 gs->identifier = oiddup(identifier);
1982 break;
1983 case GREP_SOURCE_BUF:
1984 gs->identifier = NULL;
1985 break;
1986 }
1987 }
1988
1989 void grep_source_clear(struct grep_source *gs)
1990 {
1991 FREE_AND_NULL(gs->name);
1992 FREE_AND_NULL(gs->path);
1993 FREE_AND_NULL(gs->identifier);
1994 grep_source_clear_data(gs);
1995 }
1996
1997 void grep_source_clear_data(struct grep_source *gs)
1998 {
1999 switch (gs->type) {
2000 case GREP_SOURCE_FILE:
2001 case GREP_SOURCE_OID:
2002 FREE_AND_NULL(gs->buf);
2003 gs->size = 0;
2004 break;
2005 case GREP_SOURCE_BUF:
2006 /* leave user-provided buf intact */
2007 break;
2008 }
2009 }
2010
2011 static int grep_source_load_oid(struct grep_source *gs)
2012 {
2013 enum object_type type;
2014
2015 grep_read_lock();
2016 gs->buf = read_object_file(gs->identifier, &type, &gs->size);
2017 grep_read_unlock();
2018
2019 if (!gs->buf)
2020 return error(_("'%s': unable to read %s"),
2021 gs->name,
2022 oid_to_hex(gs->identifier));
2023 return 0;
2024 }
2025
2026 static int grep_source_load_file(struct grep_source *gs)
2027 {
2028 const char *filename = gs->identifier;
2029 struct stat st;
2030 char *data;
2031 size_t size;
2032 int i;
2033
2034 if (lstat(filename, &st) < 0) {
2035 err_ret:
2036 if (errno != ENOENT)
2037 error_errno(_("failed to stat '%s'"), filename);
2038 return -1;
2039 }
2040 if (!S_ISREG(st.st_mode))
2041 return -1;
2042 size = xsize_t(st.st_size);
2043 i = open(filename, O_RDONLY);
2044 if (i < 0)
2045 goto err_ret;
2046 data = xmallocz(size);
2047 if (st.st_size != read_in_full(i, data, size)) {
2048 error_errno(_("'%s': short read"), filename);
2049 close(i);
2050 free(data);
2051 return -1;
2052 }
2053 close(i);
2054
2055 gs->buf = data;
2056 gs->size = size;
2057 return 0;
2058 }
2059
2060 static int grep_source_load(struct grep_source *gs)
2061 {
2062 if (gs->buf)
2063 return 0;
2064
2065 switch (gs->type) {
2066 case GREP_SOURCE_FILE:
2067 return grep_source_load_file(gs);
2068 case GREP_SOURCE_OID:
2069 return grep_source_load_oid(gs);
2070 case GREP_SOURCE_BUF:
2071 return gs->buf ? 0 : -1;
2072 }
2073 BUG("invalid grep_source type to load");
2074 }
2075
2076 void grep_source_load_driver(struct grep_source *gs)
2077 {
2078 if (gs->driver)
2079 return;
2080
2081 grep_attr_lock();
2082 if (gs->path)
2083 gs->driver = userdiff_find_by_path(gs->path);
2084 if (!gs->driver)
2085 gs->driver = userdiff_find_by_name("default");
2086 grep_attr_unlock();
2087 }
2088
2089 static int grep_source_is_binary(struct grep_source *gs)
2090 {
2091 grep_source_load_driver(gs);
2092 if (gs->driver->binary != -1)
2093 return gs->driver->binary;
2094
2095 if (!grep_source_load(gs))
2096 return buffer_is_binary(gs->buf, gs->size);
2097
2098 return 0;
2099 }
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