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Merge branch 'jk/unused-annotation'
[git/debian.git] / grep.c
blob52a894c989087c70f215fc46d9f17489de546d8c
1 #include "cache.h"
2 #include "config.h"
3 #include "grep.h"
4 #include "object-store.h"
5 #include "userdiff.h"
6 #include "xdiff-interface.h"
7 #include "diff.h"
8 #include "diffcore.h"
9 #include "commit.h"
10 #include "quote.h"
11 #include "help.h"
12
13 static int grep_source_load(struct grep_source *gs);
14 static int grep_source_is_binary(struct grep_source *gs,
15 struct index_state *istate);
16
17 static void std_output(struct grep_opt *opt, const void *buf, size_t size)
18 {
19 fwrite(buf, size, 1, stdout);
20 }
21
22 static const char *color_grep_slots[] = {
23 [GREP_COLOR_CONTEXT] = "context",
24 [GREP_COLOR_FILENAME] = "filename",
25 [GREP_COLOR_FUNCTION] = "function",
26 [GREP_COLOR_LINENO] = "lineNumber",
27 [GREP_COLOR_COLUMNNO] = "column",
28 [GREP_COLOR_MATCH_CONTEXT] = "matchContext",
29 [GREP_COLOR_MATCH_SELECTED] = "matchSelected",
30 [GREP_COLOR_SELECTED] = "selected",
31 [GREP_COLOR_SEP] = "separator",
32 };
33
34 static int parse_pattern_type_arg(const char *opt, const char *arg)
35 {
36 if (!strcmp(arg, "default"))
37 return GREP_PATTERN_TYPE_UNSPECIFIED;
38 else if (!strcmp(arg, "basic"))
39 return GREP_PATTERN_TYPE_BRE;
40 else if (!strcmp(arg, "extended"))
41 return GREP_PATTERN_TYPE_ERE;
42 else if (!strcmp(arg, "fixed"))
43 return GREP_PATTERN_TYPE_FIXED;
44 else if (!strcmp(arg, "perl"))
45 return GREP_PATTERN_TYPE_PCRE;
46 die("bad %s argument: %s", opt, arg);
47 }
48
49 define_list_config_array_extra(color_grep_slots, {"match"});
50
51 /*
52 * Read the configuration file once and store it in
53 * the grep_defaults template.
54 */
55 int grep_config(const char *var, const char *value, void *cb)
56 {
57 struct grep_opt *opt = cb;
58 const char *slot;
59
60 if (userdiff_config(var, value) < 0)
61 return -1;
62
63 if (!strcmp(var, "grep.extendedregexp")) {
64 opt->extended_regexp_option = git_config_bool(var, value);
65 return 0;
66 }
67
68 if (!strcmp(var, "grep.patterntype")) {
69 opt->pattern_type_option = parse_pattern_type_arg(var, value);
70 return 0;
71 }
72
73 if (!strcmp(var, "grep.linenumber")) {
74 opt->linenum = git_config_bool(var, value);
75 return 0;
76 }
77 if (!strcmp(var, "grep.column")) {
78 opt->columnnum = git_config_bool(var, value);
79 return 0;
80 }
81
82 if (!strcmp(var, "grep.fullname")) {
83 opt->relative = !git_config_bool(var, value);
84 return 0;
85 }
86
87 if (!strcmp(var, "color.grep"))
88 opt->color = git_config_colorbool(var, value);
89 if (!strcmp(var, "color.grep.match")) {
90 if (grep_config("color.grep.matchcontext", value, cb) < 0)
91 return -1;
92 if (grep_config("color.grep.matchselected", value, cb) < 0)
93 return -1;
94 } else if (skip_prefix(var, "color.grep.", &slot)) {
95 int i = LOOKUP_CONFIG(color_grep_slots, slot);
96 char *color;
97
98 if (i < 0)
99 return -1;
100 color = opt->colors[i];
101 if (!value)
102 return config_error_nonbool(var);
103 return color_parse(value, color);
104 }
105 return 0;
106 }
107
108 void grep_init(struct grep_opt *opt, struct repository *repo)
109 {
110 struct grep_opt blank = GREP_OPT_INIT;
111 memcpy(opt, &blank, sizeof(*opt));
112
113 opt->repo = repo;
114 opt->pattern_tail = &opt->pattern_list;
115 opt->header_tail = &opt->header_list;
116 }
117
118 static struct grep_pat *create_grep_pat(const char *pat, size_t patlen,
119 const char *origin, int no,
120 enum grep_pat_token t,
121 enum grep_header_field field)
122 {
123 struct grep_pat *p = xcalloc(1, sizeof(*p));
124 p->pattern = xmemdupz(pat, patlen);
125 p->patternlen = patlen;
126 p->origin = origin;
127 p->no = no;
128 p->token = t;
129 p->field = field;
130 return p;
131 }
132
133 static void do_append_grep_pat(struct grep_pat ***tail, struct grep_pat *p)
134 {
135 **tail = p;
136 *tail = &p->next;
137 p->next = NULL;
138
139 switch (p->token) {
140 case GREP_PATTERN: /* atom */
141 case GREP_PATTERN_HEAD:
142 case GREP_PATTERN_BODY:
143 for (;;) {
144 struct grep_pat *new_pat;
145 size_t len = 0;
146 char *cp = p->pattern + p->patternlen, *nl = NULL;
147 while (++len <= p->patternlen) {
148 if (*(--cp) == '\n') {
149 nl = cp;
150 break;
151 }
152 }
153 if (!nl)
154 break;
155 new_pat = create_grep_pat(nl + 1, len - 1, p->origin,
156 p->no, p->token, p->field);
157 new_pat->next = p->next;
158 if (!p->next)
159 *tail = &new_pat->next;
160 p->next = new_pat;
161 *nl = '\0';
162 p->patternlen -= len;
163 }
164 break;
165 default:
166 break;
167 }
168 }
169
170 void append_header_grep_pattern(struct grep_opt *opt,
171 enum grep_header_field field, const char *pat)
172 {
173 struct grep_pat *p = create_grep_pat(pat, strlen(pat), "header", 0,
174 GREP_PATTERN_HEAD, field);
175 if (field == GREP_HEADER_REFLOG)
176 opt->use_reflog_filter = 1;
177 do_append_grep_pat(&opt->header_tail, p);
178 }
179
180 void append_grep_pattern(struct grep_opt *opt, const char *pat,
181 const char *origin, int no, enum grep_pat_token t)
182 {
183 append_grep_pat(opt, pat, strlen(pat), origin, no, t);
184 }
185
186 void append_grep_pat(struct grep_opt *opt, const char *pat, size_t patlen,
187 const char *origin, int no, enum grep_pat_token t)
188 {
189 struct grep_pat *p = create_grep_pat(pat, patlen, origin, no, t, 0);
190 do_append_grep_pat(&opt->pattern_tail, p);
191 }
192
193 struct grep_opt *grep_opt_dup(const struct grep_opt *opt)
194 {
195 struct grep_pat *pat;
196 struct grep_opt *ret = xmalloc(sizeof(struct grep_opt));
197 *ret = *opt;
198
199 ret->pattern_list = NULL;
200 ret->pattern_tail = &ret->pattern_list;
201
202 for(pat = opt->pattern_list; pat != NULL; pat = pat->next)
203 {
204 if(pat->token == GREP_PATTERN_HEAD)
205 append_header_grep_pattern(ret, pat->field,
206 pat->pattern);
207 else
208 append_grep_pat(ret, pat->pattern, pat->patternlen,
209 pat->origin, pat->no, pat->token);
210 }
211
212 return ret;
213 }
214
215 static NORETURN void compile_regexp_failed(const struct grep_pat *p,
216 const char *error)
217 {
218 char where[1024];
219
220 if (p->no)
221 xsnprintf(where, sizeof(where), "In '%s' at %d, ", p->origin, p->no);
222 else if (p->origin)
223 xsnprintf(where, sizeof(where), "%s, ", p->origin);
224 else
225 where[0] = 0;
226
227 die("%s'%s': %s", where, p->pattern, error);
228 }
229
230 static int is_fixed(const char *s, size_t len)
231 {
232 size_t i;
233
234 for (i = 0; i < len; i++) {
235 if (is_regex_special(s[i]))
236 return 0;
237 }
238
239 return 1;
240 }
241
242 #ifdef USE_LIBPCRE2
243 #define GREP_PCRE2_DEBUG_MALLOC 0
244
245 static void *pcre2_malloc(PCRE2_SIZE size, MAYBE_UNUSED void *memory_data)
246 {
247 void *pointer = malloc(size);
248 #if GREP_PCRE2_DEBUG_MALLOC
249 static int count = 1;
250 fprintf(stderr, "PCRE2:%p -> #%02d: alloc(%lu)\n", pointer, count++, size);
251 #endif
252 return pointer;
253 }
254
255 static void pcre2_free(void *pointer, MAYBE_UNUSED void *memory_data)
256 {
257 #if GREP_PCRE2_DEBUG_MALLOC
258 static int count = 1;
259 if (pointer)
260 fprintf(stderr, "PCRE2:%p -> #%02d: free()\n", pointer, count++);
261 #endif
262 free(pointer);
263 }
264
265 static void compile_pcre2_pattern(struct grep_pat *p, const struct grep_opt *opt)
266 {
267 int error;
268 PCRE2_UCHAR errbuf[256];
269 PCRE2_SIZE erroffset;
270 int options = PCRE2_MULTILINE;
271 int jitret;
272 int patinforet;
273 size_t jitsizearg;
274 int literal = !opt->ignore_case && (p->fixed || p->is_fixed);
275
276 /*
277 * Call pcre2_general_context_create() before calling any
278 * other pcre2_*(). It sets up our malloc()/free() functions
279 * with which everything else is allocated.
280 */
281 p->pcre2_general_context = pcre2_general_context_create(
282 pcre2_malloc, pcre2_free, NULL);
283 if (!p->pcre2_general_context)
284 die("Couldn't allocate PCRE2 general context");
285
286 if (opt->ignore_case) {
287 if (!opt->ignore_locale && has_non_ascii(p->pattern)) {
288 p->pcre2_tables = pcre2_maketables(p->pcre2_general_context);
289 p->pcre2_compile_context = pcre2_compile_context_create(p->pcre2_general_context);
290 pcre2_set_character_tables(p->pcre2_compile_context,
291 p->pcre2_tables);
292 }
293 options |= PCRE2_CASELESS;
294 }
295 if (!opt->ignore_locale && is_utf8_locale() && !literal)
296 options |= (PCRE2_UTF | PCRE2_MATCH_INVALID_UTF);
297
298 #ifndef GIT_PCRE2_VERSION_10_36_OR_HIGHER
299 /* Work around https://bugs.exim.org/show_bug.cgi?id=2642 fixed in 10.36 */
300 if (PCRE2_MATCH_INVALID_UTF && options & (PCRE2_UTF | PCRE2_CASELESS))
301 options |= PCRE2_NO_START_OPTIMIZE;
302 #endif
303
304 p->pcre2_pattern = pcre2_compile((PCRE2_SPTR)p->pattern,
305 p->patternlen, options, &error, &erroffset,
306 p->pcre2_compile_context);
307
308 if (p->pcre2_pattern) {
309 p->pcre2_match_data = pcre2_match_data_create_from_pattern(p->pcre2_pattern, p->pcre2_general_context);
310 if (!p->pcre2_match_data)
311 die("Couldn't allocate PCRE2 match data");
312 } else {
313 pcre2_get_error_message(error, errbuf, sizeof(errbuf));
314 compile_regexp_failed(p, (const char *)&errbuf);
315 }
316
317 pcre2_config(PCRE2_CONFIG_JIT, &p->pcre2_jit_on);
318 if (p->pcre2_jit_on) {
319 jitret = pcre2_jit_compile(p->pcre2_pattern, PCRE2_JIT_COMPLETE);
320 if (jitret)
321 die("Couldn't JIT the PCRE2 pattern '%s', got '%d'\n", p->pattern, jitret);
322
323 /*
324 * The pcre2_config(PCRE2_CONFIG_JIT, ...) call just
325 * tells us whether the library itself supports JIT,
326 * but to see whether we're going to be actually using
327 * JIT we need to extract PCRE2_INFO_JITSIZE from the
328 * pattern *after* we do pcre2_jit_compile() above.
329 *
330 * This is because if the pattern contains the
331 * (*NO_JIT) verb (see pcre2syntax(3))
332 * pcre2_jit_compile() will exit early with 0. If we
333 * then proceed to call pcre2_jit_match() further down
334 * the line instead of pcre2_match() we'll either
335 * segfault (pre PCRE 10.31) or run into a fatal error
336 * (post PCRE2 10.31)
337 */
338 patinforet = pcre2_pattern_info(p->pcre2_pattern, PCRE2_INFO_JITSIZE, &jitsizearg);
339 if (patinforet)
340 BUG("pcre2_pattern_info() failed: %d", patinforet);
341 if (jitsizearg == 0) {
342 p->pcre2_jit_on = 0;
343 return;
344 }
345 }
346 }
347
348 static int pcre2match(struct grep_pat *p, const char *line, const char *eol,
349 regmatch_t *match, int eflags)
350 {
351 int ret, flags = 0;
352 PCRE2_SIZE *ovector;
353 PCRE2_UCHAR errbuf[256];
354
355 if (eflags & REG_NOTBOL)
356 flags |= PCRE2_NOTBOL;
357
358 if (p->pcre2_jit_on)
359 ret = pcre2_jit_match(p->pcre2_pattern, (unsigned char *)line,
360 eol - line, 0, flags, p->pcre2_match_data,
361 NULL);
362 else
363 ret = pcre2_match(p->pcre2_pattern, (unsigned char *)line,
364 eol - line, 0, flags, p->pcre2_match_data,
365 NULL);
366
367 if (ret < 0 && ret != PCRE2_ERROR_NOMATCH) {
368 pcre2_get_error_message(ret, errbuf, sizeof(errbuf));
369 die("%s failed with error code %d: %s",
370 (p->pcre2_jit_on ? "pcre2_jit_match" : "pcre2_match"), ret,
371 errbuf);
372 }
373 if (ret > 0) {
374 ovector = pcre2_get_ovector_pointer(p->pcre2_match_data);
375 ret = 0;
376 match->rm_so = (int)ovector[0];
377 match->rm_eo = (int)ovector[1];
378 }
379
380 return ret;
381 }
382
383 static void free_pcre2_pattern(struct grep_pat *p)
384 {
385 pcre2_compile_context_free(p->pcre2_compile_context);
386 pcre2_code_free(p->pcre2_pattern);
387 pcre2_match_data_free(p->pcre2_match_data);
388 #ifdef GIT_PCRE2_VERSION_10_34_OR_HIGHER
389 pcre2_maketables_free(p->pcre2_general_context, p->pcre2_tables);
390 #else
391 free((void *)p->pcre2_tables);
392 #endif
393 pcre2_general_context_free(p->pcre2_general_context);
394 }
395 #else /* !USE_LIBPCRE2 */
396 static void compile_pcre2_pattern(struct grep_pat *p, const struct grep_opt *opt)
397 {
398 die("cannot use Perl-compatible regexes when not compiled with USE_LIBPCRE");
399 }
400
401 static int pcre2match(struct grep_pat *p, const char *line, const char *eol,
402 regmatch_t *match, int eflags)
403 {
404 return 1;
405 }
406
407 static void free_pcre2_pattern(struct grep_pat *p)
408 {
409 }
410
411 static void compile_fixed_regexp(struct grep_pat *p, struct grep_opt *opt)
412 {
413 struct strbuf sb = STRBUF_INIT;
414 int err;
415 int regflags = 0;
416
417 basic_regex_quote_buf(&sb, p->pattern);
418 if (opt->ignore_case)
419 regflags |= REG_ICASE;
420 err = regcomp(&p->regexp, sb.buf, regflags);
421 strbuf_release(&sb);
422 if (err) {
423 char errbuf[1024];
424 regerror(err, &p->regexp, errbuf, sizeof(errbuf));
425 compile_regexp_failed(p, errbuf);
426 }
427 }
428 #endif /* !USE_LIBPCRE2 */
429
430 static void compile_regexp(struct grep_pat *p, struct grep_opt *opt)
431 {
432 int err;
433 int regflags = REG_NEWLINE;
434
435 if (opt->pattern_type_option == GREP_PATTERN_TYPE_UNSPECIFIED)
436 opt->pattern_type_option = (opt->extended_regexp_option
437 ? GREP_PATTERN_TYPE_ERE
438 : GREP_PATTERN_TYPE_BRE);
439
440 p->word_regexp = opt->word_regexp;
441 p->ignore_case = opt->ignore_case;
442 p->fixed = opt->pattern_type_option == GREP_PATTERN_TYPE_FIXED;
443
444 if (opt->pattern_type_option != GREP_PATTERN_TYPE_PCRE &&
445 memchr(p->pattern, 0, p->patternlen))
446 die(_("given pattern contains NULL byte (via -f <file>). This is only supported with -P under PCRE v2"));
447
448 p->is_fixed = is_fixed(p->pattern, p->patternlen);
449 #ifdef USE_LIBPCRE2
450 if (!p->fixed && !p->is_fixed) {
451 const char *no_jit = "(*NO_JIT)";
452 const int no_jit_len = strlen(no_jit);
453 if (starts_with(p->pattern, no_jit) &&
454 is_fixed(p->pattern + no_jit_len,
455 p->patternlen - no_jit_len))
456 p->is_fixed = 1;
457 }
458 #endif
459 if (p->fixed || p->is_fixed) {
460 #ifdef USE_LIBPCRE2
461 if (p->is_fixed) {
462 compile_pcre2_pattern(p, opt);
463 } else {
464 /*
465 * E.g. t7811-grep-open.sh relies on the
466 * pattern being restored.
467 */
468 char *old_pattern = p->pattern;
469 size_t old_patternlen = p->patternlen;
470 struct strbuf sb = STRBUF_INIT;
471
472 /*
473 * There is the PCRE2_LITERAL flag, but it's
474 * only in PCRE v2 10.30 and later. Needing to
475 * ifdef our way around that and dealing with
476 * it + PCRE2_MULTILINE being an error is more
477 * complex than just quoting this ourselves.
478 */
479 strbuf_add(&sb, "\\Q", 2);
480 strbuf_add(&sb, p->pattern, p->patternlen);
481 strbuf_add(&sb, "\\E", 2);
482
483 p->pattern = sb.buf;
484 p->patternlen = sb.len;
485 compile_pcre2_pattern(p, opt);
486 p->pattern = old_pattern;
487 p->patternlen = old_patternlen;
488 strbuf_release(&sb);
489 }
490 #else /* !USE_LIBPCRE2 */
491 compile_fixed_regexp(p, opt);
492 #endif /* !USE_LIBPCRE2 */
493 return;
494 }
495
496 if (opt->pattern_type_option == GREP_PATTERN_TYPE_PCRE) {
497 compile_pcre2_pattern(p, opt);
498 return;
499 }
500
501 if (p->ignore_case)
502 regflags |= REG_ICASE;
503 if (opt->pattern_type_option == GREP_PATTERN_TYPE_ERE)
504 regflags |= REG_EXTENDED;
505 err = regcomp(&p->regexp, p->pattern, regflags);
506 if (err) {
507 char errbuf[1024];
508 regerror(err, &p->regexp, errbuf, 1024);
509 compile_regexp_failed(p, errbuf);
510 }
511 }
512
513 static struct grep_expr *grep_not_expr(struct grep_expr *expr)
514 {
515 struct grep_expr *z = xcalloc(1, sizeof(*z));
516 z->node = GREP_NODE_NOT;
517 z->u.unary = expr;
518 return z;
519 }
520
521 static struct grep_expr *grep_binexp(enum grep_expr_node kind,
522 struct grep_expr *left,
523 struct grep_expr *right)
524 {
525 struct grep_expr *z = xcalloc(1, sizeof(*z));
526 z->node = kind;
527 z->u.binary.left = left;
528 z->u.binary.right = right;
529 return z;
530 }
531
532 static struct grep_expr *grep_or_expr(struct grep_expr *left, struct grep_expr *right)
533 {
534 return grep_binexp(GREP_NODE_OR, left, right);
535 }
536
537 static struct grep_expr *grep_and_expr(struct grep_expr *left, struct grep_expr *right)
538 {
539 return grep_binexp(GREP_NODE_AND, left, right);
540 }
541
542 static struct grep_expr *compile_pattern_or(struct grep_pat **);
543 static struct grep_expr *compile_pattern_atom(struct grep_pat **list)
544 {
545 struct grep_pat *p;
546 struct grep_expr *x;
547
548 p = *list;
549 if (!p)
550 return NULL;
551 switch (p->token) {
552 case GREP_PATTERN: /* atom */
553 case GREP_PATTERN_HEAD:
554 case GREP_PATTERN_BODY:
555 CALLOC_ARRAY(x, 1);
556 x->node = GREP_NODE_ATOM;
557 x->u.atom = p;
558 *list = p->next;
559 return x;
560 case GREP_OPEN_PAREN:
561 *list = p->next;
562 x = compile_pattern_or(list);
563 if (!*list || (*list)->token != GREP_CLOSE_PAREN)
564 die("unmatched parenthesis");
565 *list = (*list)->next;
566 return x;
567 default:
568 return NULL;
569 }
570 }
571
572 static struct grep_expr *compile_pattern_not(struct grep_pat **list)
573 {
574 struct grep_pat *p;
575 struct grep_expr *x;
576
577 p = *list;
578 if (!p)
579 return NULL;
580 switch (p->token) {
581 case GREP_NOT:
582 if (!p->next)
583 die("--not not followed by pattern expression");
584 *list = p->next;
585 x = compile_pattern_not(list);
586 if (!x)
587 die("--not followed by non pattern expression");
588 return grep_not_expr(x);
589 default:
590 return compile_pattern_atom(list);
591 }
592 }
593
594 static struct grep_expr *compile_pattern_and(struct grep_pat **list)
595 {
596 struct grep_pat *p;
597 struct grep_expr *x, *y;
598
599 x = compile_pattern_not(list);
600 p = *list;
601 if (p && p->token == GREP_AND) {
602 if (!x)
603 die("--and not preceded by pattern expression");
604 if (!p->next)
605 die("--and not followed by pattern expression");
606 *list = p->next;
607 y = compile_pattern_and(list);
608 if (!y)
609 die("--and not followed by pattern expression");
610 return grep_and_expr(x, y);
611 }
612 return x;
613 }
614
615 static struct grep_expr *compile_pattern_or(struct grep_pat **list)
616 {
617 struct grep_pat *p;
618 struct grep_expr *x, *y;
619
620 x = compile_pattern_and(list);
621 p = *list;
622 if (x && p && p->token != GREP_CLOSE_PAREN) {
623 y = compile_pattern_or(list);
624 if (!y)
625 die("not a pattern expression %s", p->pattern);
626 return grep_or_expr(x, y);
627 }
628 return x;
629 }
630
631 static struct grep_expr *compile_pattern_expr(struct grep_pat **list)
632 {
633 return compile_pattern_or(list);
634 }
635
636 static struct grep_expr *grep_true_expr(void)
637 {
638 struct grep_expr *z = xcalloc(1, sizeof(*z));
639 z->node = GREP_NODE_TRUE;
640 return z;
641 }
642
643 static struct grep_expr *prep_header_patterns(struct grep_opt *opt)
644 {
645 struct grep_pat *p;
646 struct grep_expr *header_expr;
647 struct grep_expr *(header_group[GREP_HEADER_FIELD_MAX]);
648 enum grep_header_field fld;
649
650 if (!opt->header_list)
651 return NULL;
652
653 for (p = opt->header_list; p; p = p->next) {
654 if (p->token != GREP_PATTERN_HEAD)
655 BUG("a non-header pattern in grep header list.");
656 if (p->field < GREP_HEADER_FIELD_MIN ||
657 GREP_HEADER_FIELD_MAX <= p->field)
658 BUG("unknown header field %d", p->field);
659 compile_regexp(p, opt);
660 }
661
662 for (fld = 0; fld < GREP_HEADER_FIELD_MAX; fld++)
663 header_group[fld] = NULL;
664
665 for (p = opt->header_list; p; p = p->next) {
666 struct grep_expr *h;
667 struct grep_pat *pp = p;
668
669 h = compile_pattern_atom(&pp);
670 if (!h || pp != p->next)
671 BUG("malformed header expr");
672 if (!header_group[p->field]) {
673 header_group[p->field] = h;
674 continue;
675 }
676 header_group[p->field] = grep_or_expr(h, header_group[p->field]);
677 }
678
679 header_expr = NULL;
680
681 for (fld = 0; fld < GREP_HEADER_FIELD_MAX; fld++) {
682 if (!header_group[fld])
683 continue;
684 if (!header_expr)
685 header_expr = grep_true_expr();
686 header_expr = grep_or_expr(header_group[fld], header_expr);
687 }
688 return header_expr;
689 }
690
691 static struct grep_expr *grep_splice_or(struct grep_expr *x, struct grep_expr *y)
692 {
693 struct grep_expr *z = x;
694
695 while (x) {
696 assert(x->node == GREP_NODE_OR);
697 if (x->u.binary.right &&
698 x->u.binary.right->node == GREP_NODE_TRUE) {
699 x->u.binary.right = y;
700 break;
701 }
702 x = x->u.binary.right;
703 }
704 return z;
705 }
706
707 void compile_grep_patterns(struct grep_opt *opt)
708 {
709 struct grep_pat *p;
710 struct grep_expr *header_expr = prep_header_patterns(opt);
711
712 for (p = opt->pattern_list; p; p = p->next) {
713 switch (p->token) {
714 case GREP_PATTERN: /* atom */
715 case GREP_PATTERN_HEAD:
716 case GREP_PATTERN_BODY:
717 compile_regexp(p, opt);
718 break;
719 default:
720 opt->extended = 1;
721 break;
722 }
723 }
724
725 if (opt->all_match || opt->no_body_match || header_expr)
726 opt->extended = 1;
727 else if (!opt->extended)
728 return;
729
730 p = opt->pattern_list;
731 if (p)
732 opt->pattern_expression = compile_pattern_expr(&p);
733 if (p)
734 die("incomplete pattern expression: %s", p->pattern);
735
736 if (opt->no_body_match && opt->pattern_expression)
737 opt->pattern_expression = grep_not_expr(opt->pattern_expression);
738
739 if (!header_expr)
740 return;
741
742 if (!opt->pattern_expression)
743 opt->pattern_expression = header_expr;
744 else if (opt->all_match)
745 opt->pattern_expression = grep_splice_or(header_expr,
746 opt->pattern_expression);
747 else
748 opt->pattern_expression = grep_or_expr(opt->pattern_expression,
749 header_expr);
750 opt->all_match = 1;
751 }
752
753 static void free_pattern_expr(struct grep_expr *x)
754 {
755 switch (x->node) {
756 case GREP_NODE_TRUE:
757 case GREP_NODE_ATOM:
758 break;
759 case GREP_NODE_NOT:
760 free_pattern_expr(x->u.unary);
761 break;
762 case GREP_NODE_AND:
763 case GREP_NODE_OR:
764 free_pattern_expr(x->u.binary.left);
765 free_pattern_expr(x->u.binary.right);
766 break;
767 }
768 free(x);
769 }
770
771 void free_grep_patterns(struct grep_opt *opt)
772 {
773 struct grep_pat *p, *n;
774
775 for (p = opt->pattern_list; p; p = n) {
776 n = p->next;
777 switch (p->token) {
778 case GREP_PATTERN: /* atom */
779 case GREP_PATTERN_HEAD:
780 case GREP_PATTERN_BODY:
781 if (p->pcre2_pattern)
782 free_pcre2_pattern(p);
783 else
784 regfree(&p->regexp);
785 free(p->pattern);
786 break;
787 default:
788 break;
789 }
790 free(p);
791 }
792
793 if (!opt->extended)
794 return;
795 free_pattern_expr(opt->pattern_expression);
796 }
797
798 static const char *end_of_line(const char *cp, unsigned long *left)
799 {
800 unsigned long l = *left;
801 while (l && *cp != '\n') {
802 l--;
803 cp++;
804 }
805 *left = l;
806 return cp;
807 }
808
809 static int word_char(char ch)
810 {
811 return isalnum(ch) || ch == '_';
812 }
813
814 static void output_color(struct grep_opt *opt, const void *data, size_t size,
815 const char *color)
816 {
817 if (want_color(opt->color) && color && color[0]) {
818 opt->output(opt, color, strlen(color));
819 opt->output(opt, data, size);
820 opt->output(opt, GIT_COLOR_RESET, strlen(GIT_COLOR_RESET));
821 } else
822 opt->output(opt, data, size);
823 }
824
825 static void output_sep(struct grep_opt *opt, char sign)
826 {
827 if (opt->null_following_name)
828 opt->output(opt, "\0", 1);
829 else
830 output_color(opt, &sign, 1, opt->colors[GREP_COLOR_SEP]);
831 }
832
833 static void show_name(struct grep_opt *opt, const char *name)
834 {
835 output_color(opt, name, strlen(name), opt->colors[GREP_COLOR_FILENAME]);
836 opt->output(opt, opt->null_following_name ? "\0" : "\n", 1);
837 }
838
839 static int patmatch(struct grep_pat *p,
840 const char *line, const char *eol,
841 regmatch_t *match, int eflags)
842 {
843 int hit;
844
845 if (p->pcre2_pattern)
846 hit = !pcre2match(p, line, eol, match, eflags);
847 else
848 hit = !regexec_buf(&p->regexp, line, eol - line, 1, match,
849 eflags);
850
851 return hit;
852 }
853
854 static void strip_timestamp(const char *bol, const char **eol_p)
855 {
856 const char *eol = *eol_p;
857
858 while (bol < --eol) {
859 if (*eol != '>')
860 continue;
861 *eol_p = ++eol;
862 break;
863 }
864 }
865
866 static struct {
867 const char *field;
868 size_t len;
869 } header_field[] = {
870 { "author ", 7 },
871 { "committer ", 10 },
872 { "reflog ", 7 },
873 };
874
875 static int headerless_match_one_pattern(struct grep_pat *p,
876 const char *bol, const char *eol,
877 enum grep_context ctx,
878 regmatch_t *pmatch, int eflags)
879 {
880 int hit = 0;
881 const char *start = bol;
882
883 if ((p->token != GREP_PATTERN) &&
884 ((p->token == GREP_PATTERN_HEAD) != (ctx == GREP_CONTEXT_HEAD)))
885 return 0;
886
887 again:
888 hit = patmatch(p, bol, eol, pmatch, eflags);
889
890 if (hit && p->word_regexp) {
891 if ((pmatch[0].rm_so < 0) ||
892 (eol - bol) < pmatch[0].rm_so ||
893 (pmatch[0].rm_eo < 0) ||
894 (eol - bol) < pmatch[0].rm_eo)
895 die("regexp returned nonsense");
896
897 /* Match beginning must be either beginning of the
898 * line, or at word boundary (i.e. the last char must
899 * not be a word char). Similarly, match end must be
900 * either end of the line, or at word boundary
901 * (i.e. the next char must not be a word char).
902 */
903 if ( ((pmatch[0].rm_so == 0) ||
904 !word_char(bol[pmatch[0].rm_so-1])) &&
905 ((pmatch[0].rm_eo == (eol-bol)) ||
906 !word_char(bol[pmatch[0].rm_eo])) )
907 ;
908 else
909 hit = 0;
910
911 /* Words consist of at least one character. */
912 if (pmatch->rm_so == pmatch->rm_eo)
913 hit = 0;
914
915 if (!hit && pmatch[0].rm_so + bol + 1 < eol) {
916 /* There could be more than one match on the
917 * line, and the first match might not be
918 * strict word match. But later ones could be!
919 * Forward to the next possible start, i.e. the
920 * next position following a non-word char.
921 */
922 bol = pmatch[0].rm_so + bol + 1;
923 while (word_char(bol[-1]) && bol < eol)
924 bol++;
925 eflags |= REG_NOTBOL;
926 if (bol < eol)
927 goto again;
928 }
929 }
930 if (hit) {
931 pmatch[0].rm_so += bol - start;
932 pmatch[0].rm_eo += bol - start;
933 }
934 return hit;
935 }
936
937 static int match_one_pattern(struct grep_pat *p,
938 const char *bol, const char *eol,
939 enum grep_context ctx, regmatch_t *pmatch,
940 int eflags)
941 {
942 const char *field;
943 size_t len;
944
945 if (p->token == GREP_PATTERN_HEAD) {
946 assert(p->field < ARRAY_SIZE(header_field));
947 field = header_field[p->field].field;
948 len = header_field[p->field].len;
949 if (strncmp(bol, field, len))
950 return 0;
951 bol += len;
952
953 switch (p->field) {
954 case GREP_HEADER_AUTHOR:
955 case GREP_HEADER_COMMITTER:
956 strip_timestamp(bol, &eol);
957 break;
958 default:
959 break;
960 }
961 }
962
963 return headerless_match_one_pattern(p, bol, eol, ctx, pmatch, eflags);
964 }
965
966
967 static int match_expr_eval(struct grep_opt *opt, struct grep_expr *x,
968 const char *bol, const char *eol,
969 enum grep_context ctx, ssize_t *col,
970 ssize_t *icol, int collect_hits)
971 {
972 int h = 0;
973
974 if (!x)
975 die("Not a valid grep expression");
976 switch (x->node) {
977 case GREP_NODE_TRUE:
978 h = 1;
979 break;
980 case GREP_NODE_ATOM:
981 {
982 regmatch_t tmp;
983 h = match_one_pattern(x->u.atom, bol, eol, ctx,
984 &tmp, 0);
985 if (h && (*col < 0 || tmp.rm_so < *col))
986 *col = tmp.rm_so;
987 }
988 if (x->u.atom->token == GREP_PATTERN_BODY)
989 opt->body_hit |= h;
990 break;
991 case GREP_NODE_NOT:
992 /*
993 * Upon visiting a GREP_NODE_NOT, col and icol become swapped.
994 */
995 h = !match_expr_eval(opt, x->u.unary, bol, eol, ctx, icol, col,
996 0);
997 break;
998 case GREP_NODE_AND:
999 h = match_expr_eval(opt, x->u.binary.left, bol, eol, ctx, col,
1000 icol, 0);
1001 if (h || opt->columnnum) {
1002 /*
1003 * Don't short-circuit AND when given --column, since a
1004 * NOT earlier in the tree may turn this into an OR. In
1005 * this case, see the below comment.
1006 */
1007 h &= match_expr_eval(opt, x->u.binary.right, bol, eol,
1008 ctx, col, icol, 0);
1009 }
1010 break;
1011 case GREP_NODE_OR:
1012 if (!(collect_hits || opt->columnnum)) {
1013 /*
1014 * Don't short-circuit OR when given --column (or
1015 * collecting hits) to ensure we don't skip a later
1016 * child that would produce an earlier match.
1017 */
1018 return (match_expr_eval(opt, x->u.binary.left, bol, eol,
1019 ctx, col, icol, 0) ||
1020 match_expr_eval(opt, x->u.binary.right, bol,
1021 eol, ctx, col, icol, 0));
1022 }
1023 h = match_expr_eval(opt, x->u.binary.left, bol, eol, ctx, col,
1024 icol, 0);
1025 if (collect_hits)
1026 x->u.binary.left->hit |= h;
1027 h |= match_expr_eval(opt, x->u.binary.right, bol, eol, ctx, col,
1028 icol, collect_hits);
1029 break;
1030 default:
1031 die("Unexpected node type (internal error) %d", x->node);
1032 }
1033 if (collect_hits)
1034 x->hit |= h;
1035 return h;
1036 }
1037
1038 static int match_expr(struct grep_opt *opt,
1039 const char *bol, const char *eol,
1040 enum grep_context ctx, ssize_t *col,
1041 ssize_t *icol, int collect_hits)
1042 {
1043 struct grep_expr *x = opt->pattern_expression;
1044 return match_expr_eval(opt, x, bol, eol, ctx, col, icol, collect_hits);
1045 }
1046
1047 static int match_line(struct grep_opt *opt,
1048 const char *bol, const char *eol,
1049 ssize_t *col, ssize_t *icol,
1050 enum grep_context ctx, int collect_hits)
1051 {
1052 struct grep_pat *p;
1053 int hit = 0;
1054
1055 if (opt->extended)
1056 return match_expr(opt, bol, eol, ctx, col, icol,
1057 collect_hits);
1058
1059 /* we do not call with collect_hits without being extended */
1060 for (p = opt->pattern_list; p; p = p->next) {
1061 regmatch_t tmp;
1062 if (match_one_pattern(p, bol, eol, ctx, &tmp, 0)) {
1063 hit |= 1;
1064 if (!opt->columnnum) {
1065 /*
1066 * Without --column, any single match on a line
1067 * is enough to know that it needs to be
1068 * printed. With --column, scan _all_ patterns
1069 * to find the earliest.
1070 */
1071 break;
1072 }
1073 if (*col < 0 || tmp.rm_so < *col)
1074 *col = tmp.rm_so;
1075 }
1076 }
1077 return hit;
1078 }
1079
1080 static int match_next_pattern(struct grep_pat *p,
1081 const char *bol, const char *eol,
1082 enum grep_context ctx,
1083 regmatch_t *pmatch, int eflags)
1084 {
1085 regmatch_t match;
1086
1087 if (!headerless_match_one_pattern(p, bol, eol, ctx, &match, eflags))
1088 return 0;
1089 if (match.rm_so < 0 || match.rm_eo < 0)
1090 return 0;
1091 if (pmatch->rm_so >= 0 && pmatch->rm_eo >= 0) {
1092 if (match.rm_so > pmatch->rm_so)
1093 return 1;
1094 if (match.rm_so == pmatch->rm_so && match.rm_eo < pmatch->rm_eo)
1095 return 1;
1096 }
1097 pmatch->rm_so = match.rm_so;
1098 pmatch->rm_eo = match.rm_eo;
1099 return 1;
1100 }
1101
1102 int grep_next_match(struct grep_opt *opt,
1103 const char *bol, const char *eol,
1104 enum grep_context ctx, regmatch_t *pmatch,
1105 enum grep_header_field field, int eflags)
1106 {
1107 struct grep_pat *p;
1108 int hit = 0;
1109
1110 pmatch->rm_so = pmatch->rm_eo = -1;
1111 if (bol < eol) {
1112 for (p = ((ctx == GREP_CONTEXT_HEAD)
1113 ? opt->header_list : opt->pattern_list);
1114 p; p = p->next) {
1115 switch (p->token) {
1116 case GREP_PATTERN_HEAD:
1117 if ((field != GREP_HEADER_FIELD_MAX) &&
1118 (p->field != field))
1119 continue;
1120 /* fall thru */
1121 case GREP_PATTERN: /* atom */
1122 case GREP_PATTERN_BODY:
1123 hit |= match_next_pattern(p, bol, eol, ctx,
1124 pmatch, eflags);
1125 break;
1126 default:
1127 break;
1128 }
1129 }
1130 }
1131 return hit;
1132 }
1133
1134 static void show_line_header(struct grep_opt *opt, const char *name,
1135 unsigned lno, ssize_t cno, char sign)
1136 {
1137 if (opt->heading && opt->last_shown == 0) {
1138 output_color(opt, name, strlen(name), opt->colors[GREP_COLOR_FILENAME]);
1139 opt->output(opt, "\n", 1);
1140 }
1141 opt->last_shown = lno;
1142
1143 if (!opt->heading && opt->pathname) {
1144 output_color(opt, name, strlen(name), opt->colors[GREP_COLOR_FILENAME]);
1145 output_sep(opt, sign);
1146 }
1147 if (opt->linenum) {
1148 char buf[32];
1149 xsnprintf(buf, sizeof(buf), "%d", lno);
1150 output_color(opt, buf, strlen(buf), opt->colors[GREP_COLOR_LINENO]);
1151 output_sep(opt, sign);
1152 }
1153 /*
1154 * Treat 'cno' as the 1-indexed offset from the start of a non-context
1155 * line to its first match. Otherwise, 'cno' is 0 indicating that we are
1156 * being called with a context line.
1157 */
1158 if (opt->columnnum && cno) {
1159 char buf[32];
1160 xsnprintf(buf, sizeof(buf), "%"PRIuMAX, (uintmax_t)cno);
1161 output_color(opt, buf, strlen(buf), opt->colors[GREP_COLOR_COLUMNNO]);
1162 output_sep(opt, sign);
1163 }
1164 }
1165
1166 static void show_line(struct grep_opt *opt,
1167 const char *bol, const char *eol,
1168 const char *name, unsigned lno, ssize_t cno, char sign)
1169 {
1170 int rest = eol - bol;
1171 const char *match_color = NULL;
1172 const char *line_color = NULL;
1173
1174 if (opt->file_break && opt->last_shown == 0) {
1175 if (opt->show_hunk_mark)
1176 opt->output(opt, "\n", 1);
1177 } else if (opt->pre_context || opt->post_context || opt->funcbody) {
1178 if (opt->last_shown == 0) {
1179 if (opt->show_hunk_mark) {
1180 output_color(opt, "--", 2, opt->colors[GREP_COLOR_SEP]);
1181 opt->output(opt, "\n", 1);
1182 }
1183 } else if (lno > opt->last_shown + 1) {
1184 output_color(opt, "--", 2, opt->colors[GREP_COLOR_SEP]);
1185 opt->output(opt, "\n", 1);
1186 }
1187 }
1188 if (!opt->only_matching) {
1189 /*
1190 * In case the line we're being called with contains more than
1191 * one match, leave printing each header to the loop below.
1192 */
1193 show_line_header(opt, name, lno, cno, sign);
1194 }
1195 if (opt->color || opt->only_matching) {
1196 regmatch_t match;
1197 enum grep_context ctx = GREP_CONTEXT_BODY;
1198 int eflags = 0;
1199
1200 if (opt->color) {
1201 if (sign == ':')
1202 match_color = opt->colors[GREP_COLOR_MATCH_SELECTED];
1203 else
1204 match_color = opt->colors[GREP_COLOR_MATCH_CONTEXT];
1205 if (sign == ':')
1206 line_color = opt->colors[GREP_COLOR_SELECTED];
1207 else if (sign == '-')
1208 line_color = opt->colors[GREP_COLOR_CONTEXT];
1209 else if (sign == '=')
1210 line_color = opt->colors[GREP_COLOR_FUNCTION];
1211 }
1212 while (grep_next_match(opt, bol, eol, ctx, &match,
1213 GREP_HEADER_FIELD_MAX, eflags)) {
1214 if (match.rm_so == match.rm_eo)
1215 break;
1216
1217 if (opt->only_matching)
1218 show_line_header(opt, name, lno, cno, sign);
1219 else
1220 output_color(opt, bol, match.rm_so, line_color);
1221 output_color(opt, bol + match.rm_so,
1222 match.rm_eo - match.rm_so, match_color);
1223 if (opt->only_matching)
1224 opt->output(opt, "\n", 1);
1225 bol += match.rm_eo;
1226 cno += match.rm_eo;
1227 rest -= match.rm_eo;
1228 eflags = REG_NOTBOL;
1229 }
1230 }
1231 if (!opt->only_matching) {
1232 output_color(opt, bol, rest, line_color);
1233 opt->output(opt, "\n", 1);
1234 }
1235 }
1236
1237 int grep_use_locks;
1238
1239 /*
1240 * This lock protects access to the gitattributes machinery, which is
1241 * not thread-safe.
1242 */
1243 pthread_mutex_t grep_attr_mutex;
1244
1245 static inline void grep_attr_lock(void)
1246 {
1247 if (grep_use_locks)
1248 pthread_mutex_lock(&grep_attr_mutex);
1249 }
1250
1251 static inline void grep_attr_unlock(void)
1252 {
1253 if (grep_use_locks)
1254 pthread_mutex_unlock(&grep_attr_mutex);
1255 }
1256
1257 static int match_funcname(struct grep_opt *opt, struct grep_source *gs,
1258 const char *bol, const char *eol)
1259 {
1260 xdemitconf_t *xecfg = opt->priv;
1261 if (xecfg && !xecfg->find_func) {
1262 grep_source_load_driver(gs, opt->repo->index);
1263 if (gs->driver->funcname.pattern) {
1264 const struct userdiff_funcname *pe = &gs->driver->funcname;
1265 xdiff_set_find_func(xecfg, pe->pattern, pe->cflags);
1266 } else {
1267 xecfg = opt->priv = NULL;
1268 }
1269 }
1270
1271 if (xecfg) {
1272 char buf[1];
1273 return xecfg->find_func(bol, eol - bol, buf, 1,
1274 xecfg->find_func_priv) >= 0;
1275 }
1276
1277 if (bol == eol)
1278 return 0;
1279 if (isalpha(*bol) || *bol == '_' || *bol == '$')
1280 return 1;
1281 return 0;
1282 }
1283
1284 static void show_funcname_line(struct grep_opt *opt, struct grep_source *gs,
1285 const char *bol, unsigned lno)
1286 {
1287 while (bol > gs->buf) {
1288 const char *eol = --bol;
1289
1290 while (bol > gs->buf && bol[-1] != '\n')
1291 bol--;
1292 lno--;
1293
1294 if (lno <= opt->last_shown)
1295 break;
1296
1297 if (match_funcname(opt, gs, bol, eol)) {
1298 show_line(opt, bol, eol, gs->name, lno, 0, '=');
1299 break;
1300 }
1301 }
1302 }
1303
1304 static int is_empty_line(const char *bol, const char *eol);
1305
1306 static void show_pre_context(struct grep_opt *opt, struct grep_source *gs,
1307 const char *bol, const char *end, unsigned lno)
1308 {
1309 unsigned cur = lno, from = 1, funcname_lno = 0, orig_from;
1310 int funcname_needed = !!opt->funcname, comment_needed = 0;
1311
1312 if (opt->pre_context < lno)
1313 from = lno - opt->pre_context;
1314 if (from <= opt->last_shown)
1315 from = opt->last_shown + 1;
1316 orig_from = from;
1317 if (opt->funcbody) {
1318 if (match_funcname(opt, gs, bol, end))
1319 comment_needed = 1;
1320 else
1321 funcname_needed = 1;
1322 from = opt->last_shown + 1;
1323 }
1324
1325 /* Rewind. */
1326 while (bol > gs->buf && cur > from) {
1327 const char *next_bol = bol;
1328 const char *eol = --bol;
1329
1330 while (bol > gs->buf && bol[-1] != '\n')
1331 bol--;
1332 cur--;
1333 if (comment_needed && (is_empty_line(bol, eol) ||
1334 match_funcname(opt, gs, bol, eol))) {
1335 comment_needed = 0;
1336 from = orig_from;
1337 if (cur < from) {
1338 cur++;
1339 bol = next_bol;
1340 break;
1341 }
1342 }
1343 if (funcname_needed && match_funcname(opt, gs, bol, eol)) {
1344 funcname_lno = cur;
1345 funcname_needed = 0;
1346 if (opt->funcbody)
1347 comment_needed = 1;
1348 else
1349 from = orig_from;
1350 }
1351 }
1352
1353 /* We need to look even further back to find a function signature. */
1354 if (opt->funcname && funcname_needed)
1355 show_funcname_line(opt, gs, bol, cur);
1356
1357 /* Back forward. */
1358 while (cur < lno) {
1359 const char *eol = bol, sign = (cur == funcname_lno) ? '=' : '-';
1360
1361 while (*eol != '\n')
1362 eol++;
1363 show_line(opt, bol, eol, gs->name, cur, 0, sign);
1364 bol = eol + 1;
1365 cur++;
1366 }
1367 }
1368
1369 static int should_lookahead(struct grep_opt *opt)
1370 {
1371 struct grep_pat *p;
1372
1373 if (opt->extended)
1374 return 0; /* punt for too complex stuff */
1375 if (opt->invert)
1376 return 0;
1377 for (p = opt->pattern_list; p; p = p->next) {
1378 if (p->token != GREP_PATTERN)
1379 return 0; /* punt for "header only" and stuff */
1380 }
1381 return 1;
1382 }
1383
1384 static int look_ahead(struct grep_opt *opt,
1385 unsigned long *left_p,
1386 unsigned *lno_p,
1387 const char **bol_p)
1388 {
1389 unsigned lno = *lno_p;
1390 const char *bol = *bol_p;
1391 struct grep_pat *p;
1392 const char *sp, *last_bol;
1393 regoff_t earliest = -1;
1394
1395 for (p = opt->pattern_list; p; p = p->next) {
1396 int hit;
1397 regmatch_t m;
1398
1399 hit = patmatch(p, bol, bol + *left_p, &m, 0);
1400 if (!hit || m.rm_so < 0 || m.rm_eo < 0)
1401 continue;
1402 if (earliest < 0 || m.rm_so < earliest)
1403 earliest = m.rm_so;
1404 }
1405
1406 if (earliest < 0) {
1407 *bol_p = bol + *left_p;
1408 *left_p = 0;
1409 return 1;
1410 }
1411 for (sp = bol + earliest; bol < sp && sp[-1] != '\n'; sp--)
1412 ; /* find the beginning of the line */
1413 last_bol = sp;
1414
1415 for (sp = bol; sp < last_bol; sp++) {
1416 if (*sp == '\n')
1417 lno++;
1418 }
1419 *left_p -= last_bol - bol;
1420 *bol_p = last_bol;
1421 *lno_p = lno;
1422 return 0;
1423 }
1424
1425 static int fill_textconv_grep(struct repository *r,
1426 struct userdiff_driver *driver,
1427 struct grep_source *gs)
1428 {
1429 struct diff_filespec *df;
1430 char *buf;
1431 size_t size;
1432
1433 if (!driver || !driver->textconv)
1434 return grep_source_load(gs);
1435
1436 /*
1437 * The textconv interface is intimately tied to diff_filespecs, so we
1438 * have to pretend to be one. If we could unify the grep_source
1439 * and diff_filespec structs, this mess could just go away.
1440 */
1441 df = alloc_filespec(gs->path);
1442 switch (gs->type) {
1443 case GREP_SOURCE_OID:
1444 fill_filespec(df, gs->identifier, 1, 0100644);
1445 break;
1446 case GREP_SOURCE_FILE:
1447 fill_filespec(df, null_oid(), 0, 0100644);
1448 break;
1449 default:
1450 BUG("attempt to textconv something without a path?");
1451 }
1452
1453 /*
1454 * fill_textconv is not remotely thread-safe; it modifies the global
1455 * diff tempfile structure, writes to the_repo's odb and might
1456 * internally call thread-unsafe functions such as the
1457 * prepare_packed_git() lazy-initializator. Because of the last two, we
1458 * must ensure mutual exclusion between this call and the object reading
1459 * API, thus we use obj_read_lock() here.
1460 *
1461 * TODO: allowing text conversion to run in parallel with object
1462 * reading operations might increase performance in the multithreaded
1463 * non-worktreee git-grep with --textconv.
1464 */
1465 obj_read_lock();
1466 size = fill_textconv(r, driver, df, &buf);
1467 obj_read_unlock();
1468 free_filespec(df);
1469
1470 /*
1471 * The normal fill_textconv usage by the diff machinery would just keep
1472 * the textconv'd buf separate from the diff_filespec. But much of the
1473 * grep code passes around a grep_source and assumes that its "buf"
1474 * pointer is the beginning of the thing we are searching. So let's
1475 * install our textconv'd version into the grep_source, taking care not
1476 * to leak any existing buffer.
1477 */
1478 grep_source_clear_data(gs);
1479 gs->buf = buf;
1480 gs->size = size;
1481
1482 return 0;
1483 }
1484
1485 static int is_empty_line(const char *bol, const char *eol)
1486 {
1487 while (bol < eol && isspace(*bol))
1488 bol++;
1489 return bol == eol;
1490 }
1491
1492 static int grep_source_1(struct grep_opt *opt, struct grep_source *gs, int collect_hits)
1493 {
1494 const char *bol;
1495 const char *peek_bol = NULL;
1496 unsigned long left;
1497 unsigned lno = 1;
1498 unsigned last_hit = 0;
1499 int binary_match_only = 0;
1500 unsigned count = 0;
1501 int try_lookahead = 0;
1502 int show_function = 0;
1503 struct userdiff_driver *textconv = NULL;
1504 enum grep_context ctx = GREP_CONTEXT_HEAD;
1505 xdemitconf_t xecfg;
1506
1507 if (!opt->status_only && gs->name == NULL)
1508 BUG("grep call which could print a name requires "
1509 "grep_source.name be non-NULL");
1510
1511 if (!opt->output)
1512 opt->output = std_output;
1513
1514 if (opt->pre_context || opt->post_context || opt->file_break ||
1515 opt->funcbody) {
1516 /* Show hunk marks, except for the first file. */
1517 if (opt->last_shown)
1518 opt->show_hunk_mark = 1;
1519 /*
1520 * If we're using threads then we can't easily identify
1521 * the first file. Always put hunk marks in that case
1522 * and skip the very first one later in work_done().
1523 */
1524 if (opt->output != std_output)
1525 opt->show_hunk_mark = 1;
1526 }
1527 opt->last_shown = 0;
1528
1529 if (opt->allow_textconv) {
1530 grep_source_load_driver(gs, opt->repo->index);
1531 /*
1532 * We might set up the shared textconv cache data here, which
1533 * is not thread-safe. Also, get_oid_with_context() and
1534 * parse_object() might be internally called. As they are not
1535 * currently thread-safe and might be racy with object reading,
1536 * obj_read_lock() must be called.
1537 */
1538 grep_attr_lock();
1539 obj_read_lock();
1540 textconv = userdiff_get_textconv(opt->repo, gs->driver);
1541 obj_read_unlock();
1542 grep_attr_unlock();
1543 }
1544
1545 /*
1546 * We know the result of a textconv is text, so we only have to care
1547 * about binary handling if we are not using it.
1548 */
1549 if (!textconv) {
1550 switch (opt->binary) {
1551 case GREP_BINARY_DEFAULT:
1552 if (grep_source_is_binary(gs, opt->repo->index))
1553 binary_match_only = 1;
1554 break;
1555 case GREP_BINARY_NOMATCH:
1556 if (grep_source_is_binary(gs, opt->repo->index))
1557 return 0; /* Assume unmatch */
1558 break;
1559 case GREP_BINARY_TEXT:
1560 break;
1561 default:
1562 BUG("unknown binary handling mode");
1563 }
1564 }
1565
1566 memset(&xecfg, 0, sizeof(xecfg));
1567 opt->priv = &xecfg;
1568
1569 try_lookahead = should_lookahead(opt);
1570
1571 if (fill_textconv_grep(opt->repo, textconv, gs) < 0)
1572 return 0;
1573
1574 bol = gs->buf;
1575 left = gs->size;
1576 while (left) {
1577 const char *eol;
1578 int hit;
1579 ssize_t cno;
1580 ssize_t col = -1, icol = -1;
1581
1582 /*
1583 * look_ahead() skips quickly to the line that possibly
1584 * has the next hit; don't call it if we need to do
1585 * something more than just skipping the current line
1586 * in response to an unmatch for the current line. E.g.
1587 * inside a post-context window, we will show the current
1588 * line as a context around the previous hit when it
1589 * doesn't hit.
1590 */
1591 if (try_lookahead
1592 && !(last_hit
1593 && (show_function ||
1594 lno <= last_hit + opt->post_context))
1595 && look_ahead(opt, &left, &lno, &bol))
1596 break;
1597 eol = end_of_line(bol, &left);
1598
1599 if ((ctx == GREP_CONTEXT_HEAD) && (eol == bol))
1600 ctx = GREP_CONTEXT_BODY;
1601
1602 hit = match_line(opt, bol, eol, &col, &icol, ctx, collect_hits);
1603
1604 if (collect_hits)
1605 goto next_line;
1606
1607 /* "grep -v -e foo -e bla" should list lines
1608 * that do not have either, so inversion should
1609 * be done outside.
1610 */
1611 if (opt->invert)
1612 hit = !hit;
1613 if (opt->unmatch_name_only) {
1614 if (hit)
1615 return 0;
1616 goto next_line;
1617 }
1618 if (hit && (opt->max_count < 0 || count < opt->max_count)) {
1619 count++;
1620 if (opt->status_only)
1621 return 1;
1622 if (opt->name_only) {
1623 show_name(opt, gs->name);
1624 return 1;
1625 }
1626 if (opt->count)
1627 goto next_line;
1628 if (binary_match_only) {
1629 opt->output(opt, "Binary file ", 12);
1630 output_color(opt, gs->name, strlen(gs->name),
1631 opt->colors[GREP_COLOR_FILENAME]);
1632 opt->output(opt, " matches\n", 9);
1633 return 1;
1634 }
1635 /* Hit at this line. If we haven't shown the
1636 * pre-context lines, we would need to show them.
1637 */
1638 if (opt->pre_context || opt->funcbody)
1639 show_pre_context(opt, gs, bol, eol, lno);
1640 else if (opt->funcname)
1641 show_funcname_line(opt, gs, bol, lno);
1642 cno = opt->invert ? icol : col;
1643 if (cno < 0) {
1644 /*
1645 * A negative cno indicates that there was no
1646 * match on the line. We are thus inverted and
1647 * being asked to show all lines that _don't_
1648 * match a given expression. Therefore, set cno
1649 * to 0 to suggest the whole line matches.
1650 */
1651 cno = 0;
1652 }
1653 show_line(opt, bol, eol, gs->name, lno, cno + 1, ':');
1654 last_hit = lno;
1655 if (opt->funcbody)
1656 show_function = 1;
1657 goto next_line;
1658 }
1659 if (show_function && (!peek_bol || peek_bol < bol)) {
1660 unsigned long peek_left = left;
1661 const char *peek_eol = eol;
1662
1663 /*
1664 * Trailing empty lines are not interesting.
1665 * Peek past them to see if they belong to the
1666 * body of the current function.
1667 */
1668 peek_bol = bol;
1669 while (is_empty_line(peek_bol, peek_eol)) {
1670 peek_bol = peek_eol + 1;
1671 peek_eol = end_of_line(peek_bol, &peek_left);
1672 }
1673
1674 if (match_funcname(opt, gs, peek_bol, peek_eol))
1675 show_function = 0;
1676 }
1677 if (show_function ||
1678 (last_hit && lno <= last_hit + opt->post_context)) {
1679 /* If the last hit is within the post context,
1680 * we need to show this line.
1681 */
1682 show_line(opt, bol, eol, gs->name, lno, col + 1, '-');
1683 }
1684
1685 next_line:
1686 bol = eol + 1;
1687 if (!left)
1688 break;
1689 left--;
1690 lno++;
1691 }
1692
1693 if (collect_hits)
1694 return 0;
1695
1696 if (opt->status_only)
1697 return opt->unmatch_name_only;
1698 if (opt->unmatch_name_only) {
1699 /* We did not see any hit, so we want to show this */
1700 show_name(opt, gs->name);
1701 return 1;
1702 }
1703
1704 xdiff_clear_find_func(&xecfg);
1705 opt->priv = NULL;
1706
1707 /* NEEDSWORK:
1708 * The real "grep -c foo *.c" gives many "bar.c:0" lines,
1709 * which feels mostly useless but sometimes useful. Maybe
1710 * make it another option? For now suppress them.
1711 */
1712 if (opt->count && count) {
1713 char buf[32];
1714 if (opt->pathname) {
1715 output_color(opt, gs->name, strlen(gs->name),
1716 opt->colors[GREP_COLOR_FILENAME]);
1717 output_sep(opt, ':');
1718 }
1719 xsnprintf(buf, sizeof(buf), "%u\n", count);
1720 opt->output(opt, buf, strlen(buf));
1721 return 1;
1722 }
1723 return !!last_hit;
1724 }
1725
1726 static void clr_hit_marker(struct grep_expr *x)
1727 {
1728 /* All-hit markers are meaningful only at the very top level
1729 * OR node.
1730 */
1731 while (1) {
1732 x->hit = 0;
1733 if (x->node != GREP_NODE_OR)
1734 return;
1735 x->u.binary.left->hit = 0;
1736 x = x->u.binary.right;
1737 }
1738 }
1739
1740 static int chk_hit_marker(struct grep_expr *x)
1741 {
1742 /* Top level nodes have hit markers. See if they all are hits */
1743 while (1) {
1744 if (x->node != GREP_NODE_OR)
1745 return x->hit;
1746 if (!x->u.binary.left->hit)
1747 return 0;
1748 x = x->u.binary.right;
1749 }
1750 }
1751
1752 int grep_source(struct grep_opt *opt, struct grep_source *gs)
1753 {
1754 /*
1755 * we do not have to do the two-pass grep when we do not check
1756 * buffer-wide "all-match".
1757 */
1758 if (!opt->all_match && !opt->no_body_match)
1759 return grep_source_1(opt, gs, 0);
1760
1761 /* Otherwise the toplevel "or" terms hit a bit differently.
1762 * We first clear hit markers from them.
1763 */
1764 clr_hit_marker(opt->pattern_expression);
1765 opt->body_hit = 0;
1766 grep_source_1(opt, gs, 1);
1767
1768 if (opt->all_match && !chk_hit_marker(opt->pattern_expression))
1769 return 0;
1770 if (opt->no_body_match && opt->body_hit)
1771 return 0;
1772
1773 return grep_source_1(opt, gs, 0);
1774 }
1775
1776 static void grep_source_init_buf(struct grep_source *gs,
1777 const char *buf,
1778 unsigned long size)
1779 {
1780 gs->type = GREP_SOURCE_BUF;
1781 gs->name = NULL;
1782 gs->path = NULL;
1783 gs->buf = buf;
1784 gs->size = size;
1785 gs->driver = NULL;
1786 gs->identifier = NULL;
1787 }
1788
1789 int grep_buffer(struct grep_opt *opt, const char *buf, unsigned long size)
1790 {
1791 struct grep_source gs;
1792 int r;
1793
1794 grep_source_init_buf(&gs, buf, size);
1795
1796 r = grep_source(opt, &gs);
1797
1798 grep_source_clear(&gs);
1799 return r;
1800 }
1801
1802 void grep_source_init_file(struct grep_source *gs, const char *name,
1803 const char *path)
1804 {
1805 gs->type = GREP_SOURCE_FILE;
1806 gs->name = xstrdup_or_null(name);
1807 gs->path = xstrdup_or_null(path);
1808 gs->buf = NULL;
1809 gs->size = 0;
1810 gs->driver = NULL;
1811 gs->identifier = xstrdup(path);
1812 }
1813
1814 void grep_source_init_oid(struct grep_source *gs, const char *name,
1815 const char *path, const struct object_id *oid,
1816 struct repository *repo)
1817 {
1818 gs->type = GREP_SOURCE_OID;
1819 gs->name = xstrdup_or_null(name);
1820 gs->path = xstrdup_or_null(path);
1821 gs->buf = NULL;
1822 gs->size = 0;
1823 gs->driver = NULL;
1824 gs->identifier = oiddup(oid);
1825 gs->repo = repo;
1826 }
1827
1828 void grep_source_clear(struct grep_source *gs)
1829 {
1830 FREE_AND_NULL(gs->name);
1831 FREE_AND_NULL(gs->path);
1832 FREE_AND_NULL(gs->identifier);
1833 grep_source_clear_data(gs);
1834 }
1835
1836 void grep_source_clear_data(struct grep_source *gs)
1837 {
1838 switch (gs->type) {
1839 case GREP_SOURCE_FILE:
1840 case GREP_SOURCE_OID:
1841 /* these types own the buffer */
1842 free((char *)gs->buf);
1843 gs->buf = NULL;
1844 gs->size = 0;
1845 break;
1846 case GREP_SOURCE_BUF:
1847 /* leave user-provided buf intact */
1848 break;
1849 }
1850 }
1851
1852 static int grep_source_load_oid(struct grep_source *gs)
1853 {
1854 enum object_type type;
1855
1856 gs->buf = repo_read_object_file(gs->repo, gs->identifier, &type,
1857 &gs->size);
1858 if (!gs->buf)
1859 return error(_("'%s': unable to read %s"),
1860 gs->name,
1861 oid_to_hex(gs->identifier));
1862 return 0;
1863 }
1864
1865 static int grep_source_load_file(struct grep_source *gs)
1866 {
1867 const char *filename = gs->identifier;
1868 struct stat st;
1869 char *data;
1870 size_t size;
1871 int i;
1872
1873 if (lstat(filename, &st) < 0) {
1874 err_ret:
1875 if (errno != ENOENT)
1876 error_errno(_("failed to stat '%s'"), filename);
1877 return -1;
1878 }
1879 if (!S_ISREG(st.st_mode))
1880 return -1;
1881 size = xsize_t(st.st_size);
1882 i = open(filename, O_RDONLY);
1883 if (i < 0)
1884 goto err_ret;
1885 data = xmallocz(size);
1886 if (st.st_size != read_in_full(i, data, size)) {
1887 error_errno(_("'%s': short read"), filename);
1888 close(i);
1889 free(data);
1890 return -1;
1891 }
1892 close(i);
1893
1894 gs->buf = data;
1895 gs->size = size;
1896 return 0;
1897 }
1898
1899 static int grep_source_load(struct grep_source *gs)
1900 {
1901 if (gs->buf)
1902 return 0;
1903
1904 switch (gs->type) {
1905 case GREP_SOURCE_FILE:
1906 return grep_source_load_file(gs);
1907 case GREP_SOURCE_OID:
1908 return grep_source_load_oid(gs);
1909 case GREP_SOURCE_BUF:
1910 return gs->buf ? 0 : -1;
1911 }
1912 BUG("invalid grep_source type to load");
1913 }
1914
1915 void grep_source_load_driver(struct grep_source *gs,
1916 struct index_state *istate)
1917 {
1918 if (gs->driver)
1919 return;
1920
1921 grep_attr_lock();
1922 if (gs->path)
1923 gs->driver = userdiff_find_by_path(istate, gs->path);
1924 if (!gs->driver)
1925 gs->driver = userdiff_find_by_name("default");
1926 grep_attr_unlock();
1927 }
1928
1929 static int grep_source_is_binary(struct grep_source *gs,
1930 struct index_state *istate)
1931 {
1932 grep_source_load_driver(gs, istate);
1933 if (gs->driver->binary != -1)
1934 return gs->driver->binary;
1935
1936 if (!grep_source_load(gs))
1937 return buffer_is_binary(gs->buf, gs->size);
1938
1939 return 0;
1940 }
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