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finalize_object_file(): check for name collision before renaming
[git/gitster.git] / grep.c
blob2f8b9553df99845597b7586cf3d0e084a0ee4919
1 #include "git-compat-util.h"
2 #include "config.h"
3 #include "gettext.h"
4 #include "grep.h"
5 #include "hex.h"
6 #include "object-store-ll.h"
7 #include "pretty.h"
8 #include "userdiff.h"
9 #include "xdiff-interface.h"
10 #include "diff.h"
11 #include "diffcore.h"
12 #include "quote.h"
13 #include "help.h"
14
15 static int grep_source_load(struct grep_source *gs);
16 static int grep_source_is_binary(struct grep_source *gs,
17 struct index_state *istate);
18
19 static void std_output(struct grep_opt *opt UNUSED, const void *buf, size_t size)
20 {
21 fwrite(buf, size, 1, stdout);
22 }
23
24 static const char *color_grep_slots[] = {
25 [GREP_COLOR_CONTEXT] = "context",
26 [GREP_COLOR_FILENAME] = "filename",
27 [GREP_COLOR_FUNCTION] = "function",
28 [GREP_COLOR_LINENO] = "lineNumber",
29 [GREP_COLOR_COLUMNNO] = "column",
30 [GREP_COLOR_MATCH_CONTEXT] = "matchContext",
31 [GREP_COLOR_MATCH_SELECTED] = "matchSelected",
32 [GREP_COLOR_SELECTED] = "selected",
33 [GREP_COLOR_SEP] = "separator",
34 };
35
36 static int parse_pattern_type_arg(const char *opt, const char *arg)
37 {
38 if (!strcmp(arg, "default"))
39 return GREP_PATTERN_TYPE_UNSPECIFIED;
40 else if (!strcmp(arg, "basic"))
41 return GREP_PATTERN_TYPE_BRE;
42 else if (!strcmp(arg, "extended"))
43 return GREP_PATTERN_TYPE_ERE;
44 else if (!strcmp(arg, "fixed"))
45 return GREP_PATTERN_TYPE_FIXED;
46 else if (!strcmp(arg, "perl"))
47 return GREP_PATTERN_TYPE_PCRE;
48 die("bad %s argument: %s", opt, arg);
49 }
50
51 define_list_config_array_extra(color_grep_slots, {"match"});
52
53 /*
54 * Read the configuration file once and store it in
55 * the grep_defaults template.
56 */
57 int grep_config(const char *var, const char *value,
58 const struct config_context *ctx, void *cb)
59 {
60 struct grep_opt *opt = cb;
61 const char *slot;
62
63 if (userdiff_config(var, value) < 0)
64 return -1;
65
66 if (!strcmp(var, "grep.extendedregexp")) {
67 opt->extended_regexp_option = git_config_bool(var, value);
68 return 0;
69 }
70
71 if (!strcmp(var, "grep.patterntype")) {
72 opt->pattern_type_option = parse_pattern_type_arg(var, value);
73 return 0;
74 }
75
76 if (!strcmp(var, "grep.linenumber")) {
77 opt->linenum = git_config_bool(var, value);
78 return 0;
79 }
80 if (!strcmp(var, "grep.column")) {
81 opt->columnnum = git_config_bool(var, value);
82 return 0;
83 }
84
85 if (!strcmp(var, "grep.fullname")) {
86 opt->relative = !git_config_bool(var, value);
87 return 0;
88 }
89
90 if (!strcmp(var, "color.grep"))
91 opt->color = git_config_colorbool(var, value);
92 if (!strcmp(var, "color.grep.match")) {
93 if (grep_config("color.grep.matchcontext", value, ctx, cb) < 0)
94 return -1;
95 if (grep_config("color.grep.matchselected", value, ctx, cb) < 0)
96 return -1;
97 } else if (skip_prefix(var, "color.grep.", &slot)) {
98 int i = LOOKUP_CONFIG(color_grep_slots, slot);
99 char *color;
100
101 if (i < 0)
102 return -1;
103 color = opt->colors[i];
104 if (!value)
105 return config_error_nonbool(var);
106 return color_parse(value, color);
107 }
108 return 0;
109 }
110
111 void grep_init(struct grep_opt *opt, struct repository *repo)
112 {
113 struct grep_opt blank = GREP_OPT_INIT;
114 memcpy(opt, &blank, sizeof(*opt));
115
116 opt->repo = repo;
117 opt->pattern_tail = &opt->pattern_list;
118 opt->header_tail = &opt->header_list;
119 }
120
121 static struct grep_pat *create_grep_pat(const char *pat, size_t patlen,
122 const char *origin, int no,
123 enum grep_pat_token t,
124 enum grep_header_field field)
125 {
126 struct grep_pat *p = xcalloc(1, sizeof(*p));
127 p->pattern = xmemdupz(pat, patlen);
128 p->patternlen = patlen;
129 p->origin = origin;
130 p->no = no;
131 p->token = t;
132 p->field = field;
133 return p;
134 }
135
136 static void do_append_grep_pat(struct grep_pat ***tail, struct grep_pat *p)
137 {
138 **tail = p;
139 *tail = &p->next;
140 p->next = NULL;
141
142 switch (p->token) {
143 case GREP_PATTERN: /* atom */
144 case GREP_PATTERN_HEAD:
145 case GREP_PATTERN_BODY:
146 for (;;) {
147 struct grep_pat *new_pat;
148 size_t len = 0;
149 char *cp = p->pattern + p->patternlen, *nl = NULL;
150 while (++len <= p->patternlen) {
151 if (*(--cp) == '\n') {
152 nl = cp;
153 break;
154 }
155 }
156 if (!nl)
157 break;
158 new_pat = create_grep_pat(nl + 1, len - 1, p->origin,
159 p->no, p->token, p->field);
160 new_pat->next = p->next;
161 if (!p->next)
162 *tail = &new_pat->next;
163 p->next = new_pat;
164 *nl = '\0';
165 p->patternlen -= len;
166 }
167 break;
168 default:
169 break;
170 }
171 }
172
173 void append_header_grep_pattern(struct grep_opt *opt,
174 enum grep_header_field field, const char *pat)
175 {
176 struct grep_pat *p = create_grep_pat(pat, strlen(pat), "header", 0,
177 GREP_PATTERN_HEAD, field);
178 if (field == GREP_HEADER_REFLOG)
179 opt->use_reflog_filter = 1;
180 do_append_grep_pat(&opt->header_tail, p);
181 }
182
183 void append_grep_pattern(struct grep_opt *opt, const char *pat,
184 const char *origin, int no, enum grep_pat_token t)
185 {
186 append_grep_pat(opt, pat, strlen(pat), origin, no, t);
187 }
188
189 void append_grep_pat(struct grep_opt *opt, const char *pat, size_t patlen,
190 const char *origin, int no, enum grep_pat_token t)
191 {
192 struct grep_pat *p = create_grep_pat(pat, patlen, origin, no, t, 0);
193 do_append_grep_pat(&opt->pattern_tail, p);
194 }
195
196 struct grep_opt *grep_opt_dup(const struct grep_opt *opt)
197 {
198 struct grep_pat *pat;
199 struct grep_opt *ret = xmalloc(sizeof(struct grep_opt));
200 *ret = *opt;
201
202 ret->pattern_list = NULL;
203 ret->pattern_tail = &ret->pattern_list;
204
205 for(pat = opt->pattern_list; pat != NULL; pat = pat->next)
206 {
207 if(pat->token == GREP_PATTERN_HEAD)
208 append_header_grep_pattern(ret, pat->field,
209 pat->pattern);
210 else
211 append_grep_pat(ret, pat->pattern, pat->patternlen,
212 pat->origin, pat->no, pat->token);
213 }
214
215 return ret;
216 }
217
218 static NORETURN void compile_regexp_failed(const struct grep_pat *p,
219 const char *error)
220 {
221 char where[1024];
222
223 if (p->no)
224 xsnprintf(where, sizeof(where), "In '%s' at %d, ", p->origin, p->no);
225 else if (p->origin)
226 xsnprintf(where, sizeof(where), "%s, ", p->origin);
227 else
228 where[0] = 0;
229
230 die("%s'%s': %s", where, p->pattern, error);
231 }
232
233 static int is_fixed(const char *s, size_t len)
234 {
235 size_t i;
236
237 for (i = 0; i < len; i++) {
238 if (is_regex_special(s[i]))
239 return 0;
240 }
241
242 return 1;
243 }
244
245 #ifdef USE_LIBPCRE2
246 #define GREP_PCRE2_DEBUG_MALLOC 0
247
248 static void *pcre2_malloc(PCRE2_SIZE size, MAYBE_UNUSED void *memory_data)
249 {
250 void *pointer = malloc(size);
251 #if GREP_PCRE2_DEBUG_MALLOC
252 static int count = 1;
253 fprintf(stderr, "PCRE2:%p -> #%02d: alloc(%lu)\n", pointer, count++, size);
254 #endif
255 return pointer;
256 }
257
258 static void pcre2_free(void *pointer, MAYBE_UNUSED void *memory_data)
259 {
260 #if GREP_PCRE2_DEBUG_MALLOC
261 static int count = 1;
262 if (pointer)
263 fprintf(stderr, "PCRE2:%p -> #%02d: free()\n", pointer, count++);
264 #endif
265 free(pointer);
266 }
267
268 static int pcre2_jit_functional(void)
269 {
270 static int jit_working = -1;
271 pcre2_code *code;
272 size_t off;
273 int err;
274
275 if (jit_working != -1)
276 return jit_working;
277
278 /*
279 * Try to JIT compile a simple pattern to probe if the JIT is
280 * working in general. It might fail for systems where creating
281 * memory mappings for runtime code generation is restricted.
282 */
283 code = pcre2_compile((PCRE2_SPTR)".", 1, 0, &err, &off, NULL);
284 if (!code)
285 return 0;
286
287 jit_working = pcre2_jit_compile(code, PCRE2_JIT_COMPLETE) == 0;
288 pcre2_code_free(code);
289
290 return jit_working;
291 }
292
293 static void compile_pcre2_pattern(struct grep_pat *p, const struct grep_opt *opt)
294 {
295 int error;
296 PCRE2_UCHAR errbuf[256];
297 PCRE2_SIZE erroffset;
298 int options = PCRE2_MULTILINE;
299 int jitret;
300 int patinforet;
301 size_t jitsizearg;
302 int literal = !opt->ignore_case && (p->fixed || p->is_fixed);
303
304 /*
305 * Call pcre2_general_context_create() before calling any
306 * other pcre2_*(). It sets up our malloc()/free() functions
307 * with which everything else is allocated.
308 */
309 p->pcre2_general_context = pcre2_general_context_create(
310 pcre2_malloc, pcre2_free, NULL);
311 if (!p->pcre2_general_context)
312 die("Couldn't allocate PCRE2 general context");
313
314 if (opt->ignore_case) {
315 if (!opt->ignore_locale && has_non_ascii(p->pattern)) {
316 p->pcre2_tables = pcre2_maketables(p->pcre2_general_context);
317 p->pcre2_compile_context = pcre2_compile_context_create(p->pcre2_general_context);
318 pcre2_set_character_tables(p->pcre2_compile_context,
319 p->pcre2_tables);
320 }
321 options |= PCRE2_CASELESS;
322 }
323 if (!opt->ignore_locale && is_utf8_locale() && !literal)
324 options |= (PCRE2_UTF | PCRE2_UCP | PCRE2_MATCH_INVALID_UTF);
325
326 #ifndef GIT_PCRE2_VERSION_10_35_OR_HIGHER
327 /*
328 * Work around a JIT bug related to invalid Unicode character handling
329 * fixed in 10.35:
330 * https://github.com/PCRE2Project/pcre2/commit/c21bd977547d
331 */
332 options &= ~PCRE2_UCP;
333 #endif
334
335 #ifndef GIT_PCRE2_VERSION_10_36_OR_HIGHER
336 /* Work around https://bugs.exim.org/show_bug.cgi?id=2642 fixed in 10.36 */
337 if (PCRE2_MATCH_INVALID_UTF && options & (PCRE2_UTF | PCRE2_CASELESS))
338 options |= PCRE2_NO_START_OPTIMIZE;
339 #endif
340
341 p->pcre2_pattern = pcre2_compile((PCRE2_SPTR)p->pattern,
342 p->patternlen, options, &error, &erroffset,
343 p->pcre2_compile_context);
344
345 if (p->pcre2_pattern) {
346 p->pcre2_match_data = pcre2_match_data_create_from_pattern(p->pcre2_pattern, p->pcre2_general_context);
347 if (!p->pcre2_match_data)
348 die("Couldn't allocate PCRE2 match data");
349 } else {
350 pcre2_get_error_message(error, errbuf, sizeof(errbuf));
351 compile_regexp_failed(p, (const char *)&errbuf);
352 }
353
354 pcre2_config(PCRE2_CONFIG_JIT, &p->pcre2_jit_on);
355 if (p->pcre2_jit_on) {
356 jitret = pcre2_jit_compile(p->pcre2_pattern, PCRE2_JIT_COMPLETE);
357 if (jitret == PCRE2_ERROR_NOMEMORY && !pcre2_jit_functional()) {
358 /*
359 * Even though pcre2_config(PCRE2_CONFIG_JIT, ...)
360 * indicated JIT support, the library might still
361 * fail to generate JIT code for various reasons,
362 * e.g. when SELinux's 'deny_execmem' or PaX's
363 * MPROTECT prevent creating W|X memory mappings.
364 *
365 * Instead of faling hard, fall back to interpreter
366 * mode, just as if the pattern was prefixed with
367 * '(*NO_JIT)'.
368 */
369 p->pcre2_jit_on = 0;
370 return;
371 } else if (jitret) {
372 int need_clip = p->patternlen > 64;
373 int clip_len = need_clip ? 64 : p->patternlen;
374 die("Couldn't JIT the PCRE2 pattern '%.*s'%s, got '%d'%s",
375 clip_len, p->pattern, need_clip ? "..." : "", jitret,
376 pcre2_jit_functional()
377 ? "\nPerhaps prefix (*NO_JIT) to your pattern?"
378 : "");
379 }
380
381 /*
382 * The pcre2_config(PCRE2_CONFIG_JIT, ...) call just
383 * tells us whether the library itself supports JIT,
384 * but to see whether we're going to be actually using
385 * JIT we need to extract PCRE2_INFO_JITSIZE from the
386 * pattern *after* we do pcre2_jit_compile() above.
387 *
388 * This is because if the pattern contains the
389 * (*NO_JIT) verb (see pcre2syntax(3))
390 * pcre2_jit_compile() will exit early with 0. If we
391 * then proceed to call pcre2_jit_match() further down
392 * the line instead of pcre2_match() we'll either
393 * segfault (pre PCRE 10.31) or run into a fatal error
394 * (post PCRE2 10.31)
395 */
396 patinforet = pcre2_pattern_info(p->pcre2_pattern, PCRE2_INFO_JITSIZE, &jitsizearg);
397 if (patinforet)
398 BUG("pcre2_pattern_info() failed: %d", patinforet);
399 if (jitsizearg == 0) {
400 p->pcre2_jit_on = 0;
401 return;
402 }
403 }
404 }
405
406 static int pcre2match(struct grep_pat *p, const char *line, const char *eol,
407 regmatch_t *match, int eflags)
408 {
409 int ret, flags = 0;
410 PCRE2_SIZE *ovector;
411 PCRE2_UCHAR errbuf[256];
412
413 if (eflags & REG_NOTBOL)
414 flags |= PCRE2_NOTBOL;
415
416 if (p->pcre2_jit_on)
417 ret = pcre2_jit_match(p->pcre2_pattern, (unsigned char *)line,
418 eol - line, 0, flags, p->pcre2_match_data,
419 NULL);
420 else
421 ret = pcre2_match(p->pcre2_pattern, (unsigned char *)line,
422 eol - line, 0, flags, p->pcre2_match_data,
423 NULL);
424
425 if (ret < 0 && ret != PCRE2_ERROR_NOMATCH) {
426 pcre2_get_error_message(ret, errbuf, sizeof(errbuf));
427 die("%s failed with error code %d: %s",
428 (p->pcre2_jit_on ? "pcre2_jit_match" : "pcre2_match"), ret,
429 errbuf);
430 }
431 if (ret > 0) {
432 ovector = pcre2_get_ovector_pointer(p->pcre2_match_data);
433 ret = 0;
434 match->rm_so = (int)ovector[0];
435 match->rm_eo = (int)ovector[1];
436 }
437
438 return ret;
439 }
440
441 static void free_pcre2_pattern(struct grep_pat *p)
442 {
443 pcre2_compile_context_free(p->pcre2_compile_context);
444 pcre2_code_free(p->pcre2_pattern);
445 pcre2_match_data_free(p->pcre2_match_data);
446 #ifdef GIT_PCRE2_VERSION_10_34_OR_HIGHER
447 pcre2_maketables_free(p->pcre2_general_context, p->pcre2_tables);
448 #else
449 free((void *)p->pcre2_tables);
450 #endif
451 pcre2_general_context_free(p->pcre2_general_context);
452 }
453 #else /* !USE_LIBPCRE2 */
454 static void compile_pcre2_pattern(struct grep_pat *p UNUSED,
455 const struct grep_opt *opt UNUSED)
456 {
457 die("cannot use Perl-compatible regexes when not compiled with USE_LIBPCRE");
458 }
459
460 static int pcre2match(struct grep_pat *p UNUSED, const char *line UNUSED,
461 const char *eol UNUSED, regmatch_t *match UNUSED,
462 int eflags UNUSED)
463 {
464 return 1;
465 }
466
467 static void free_pcre2_pattern(struct grep_pat *p UNUSED)
468 {
469 }
470
471 static void compile_fixed_regexp(struct grep_pat *p, struct grep_opt *opt)
472 {
473 struct strbuf sb = STRBUF_INIT;
474 int err;
475 int regflags = 0;
476
477 basic_regex_quote_buf(&sb, p->pattern);
478 if (opt->ignore_case)
479 regflags |= REG_ICASE;
480 err = regcomp(&p->regexp, sb.buf, regflags);
481 strbuf_release(&sb);
482 if (err) {
483 char errbuf[1024];
484 regerror(err, &p->regexp, errbuf, sizeof(errbuf));
485 compile_regexp_failed(p, errbuf);
486 }
487 }
488 #endif /* !USE_LIBPCRE2 */
489
490 static void compile_regexp(struct grep_pat *p, struct grep_opt *opt)
491 {
492 int err;
493 int regflags = REG_NEWLINE;
494
495 if (opt->pattern_type_option == GREP_PATTERN_TYPE_UNSPECIFIED)
496 opt->pattern_type_option = (opt->extended_regexp_option
497 ? GREP_PATTERN_TYPE_ERE
498 : GREP_PATTERN_TYPE_BRE);
499
500 p->word_regexp = opt->word_regexp;
501 p->ignore_case = opt->ignore_case;
502 p->fixed = opt->pattern_type_option == GREP_PATTERN_TYPE_FIXED;
503
504 if (opt->pattern_type_option != GREP_PATTERN_TYPE_PCRE &&
505 memchr(p->pattern, 0, p->patternlen))
506 die(_("given pattern contains NULL byte (via -f <file>). This is only supported with -P under PCRE v2"));
507
508 p->is_fixed = is_fixed(p->pattern, p->patternlen);
509 #ifdef USE_LIBPCRE2
510 if (!p->fixed && !p->is_fixed) {
511 const char *no_jit = "(*NO_JIT)";
512 const int no_jit_len = strlen(no_jit);
513 if (starts_with(p->pattern, no_jit) &&
514 is_fixed(p->pattern + no_jit_len,
515 p->patternlen - no_jit_len))
516 p->is_fixed = 1;
517 }
518 #endif
519 if (p->fixed || p->is_fixed) {
520 #ifdef USE_LIBPCRE2
521 if (p->is_fixed) {
522 compile_pcre2_pattern(p, opt);
523 } else {
524 /*
525 * E.g. t7811-grep-open.sh relies on the
526 * pattern being restored.
527 */
528 char *old_pattern = p->pattern;
529 size_t old_patternlen = p->patternlen;
530 struct strbuf sb = STRBUF_INIT;
531
532 /*
533 * There is the PCRE2_LITERAL flag, but it's
534 * only in PCRE v2 10.30 and later. Needing to
535 * ifdef our way around that and dealing with
536 * it + PCRE2_MULTILINE being an error is more
537 * complex than just quoting this ourselves.
538 */
539 strbuf_add(&sb, "\\Q", 2);
540 strbuf_add(&sb, p->pattern, p->patternlen);
541 strbuf_add(&sb, "\\E", 2);
542
543 p->pattern = sb.buf;
544 p->patternlen = sb.len;
545 compile_pcre2_pattern(p, opt);
546 p->pattern = old_pattern;
547 p->patternlen = old_patternlen;
548 strbuf_release(&sb);
549 }
550 #else /* !USE_LIBPCRE2 */
551 compile_fixed_regexp(p, opt);
552 #endif /* !USE_LIBPCRE2 */
553 return;
554 }
555
556 if (opt->pattern_type_option == GREP_PATTERN_TYPE_PCRE) {
557 compile_pcre2_pattern(p, opt);
558 return;
559 }
560
561 if (p->ignore_case)
562 regflags |= REG_ICASE;
563 if (opt->pattern_type_option == GREP_PATTERN_TYPE_ERE)
564 regflags |= REG_EXTENDED;
565 err = regcomp(&p->regexp, p->pattern, regflags);
566 if (err) {
567 char errbuf[1024];
568 regerror(err, &p->regexp, errbuf, 1024);
569 compile_regexp_failed(p, errbuf);
570 }
571 }
572
573 static struct grep_expr *grep_not_expr(struct grep_expr *expr)
574 {
575 struct grep_expr *z = xcalloc(1, sizeof(*z));
576 z->node = GREP_NODE_NOT;
577 z->u.unary = expr;
578 return z;
579 }
580
581 static struct grep_expr *grep_binexp(enum grep_expr_node kind,
582 struct grep_expr *left,
583 struct grep_expr *right)
584 {
585 struct grep_expr *z = xcalloc(1, sizeof(*z));
586 z->node = kind;
587 z->u.binary.left = left;
588 z->u.binary.right = right;
589 return z;
590 }
591
592 static struct grep_expr *grep_or_expr(struct grep_expr *left, struct grep_expr *right)
593 {
594 return grep_binexp(GREP_NODE_OR, left, right);
595 }
596
597 static struct grep_expr *grep_and_expr(struct grep_expr *left, struct grep_expr *right)
598 {
599 return grep_binexp(GREP_NODE_AND, left, right);
600 }
601
602 static struct grep_expr *compile_pattern_or(struct grep_pat **);
603 static struct grep_expr *compile_pattern_atom(struct grep_pat **list)
604 {
605 struct grep_pat *p;
606 struct grep_expr *x;
607
608 p = *list;
609 if (!p)
610 return NULL;
611 switch (p->token) {
612 case GREP_PATTERN: /* atom */
613 case GREP_PATTERN_HEAD:
614 case GREP_PATTERN_BODY:
615 CALLOC_ARRAY(x, 1);
616 x->node = GREP_NODE_ATOM;
617 x->u.atom = p;
618 *list = p->next;
619 return x;
620 case GREP_OPEN_PAREN:
621 *list = p->next;
622 x = compile_pattern_or(list);
623 if (!*list || (*list)->token != GREP_CLOSE_PAREN)
624 die("unmatched ( for expression group");
625 *list = (*list)->next;
626 return x;
627 default:
628 return NULL;
629 }
630 }
631
632 static struct grep_expr *compile_pattern_not(struct grep_pat **list)
633 {
634 struct grep_pat *p;
635 struct grep_expr *x;
636
637 p = *list;
638 if (!p)
639 return NULL;
640 switch (p->token) {
641 case GREP_NOT:
642 if (!p->next)
643 die("--not not followed by pattern expression");
644 *list = p->next;
645 x = compile_pattern_not(list);
646 if (!x)
647 die("--not followed by non pattern expression");
648 return grep_not_expr(x);
649 default:
650 return compile_pattern_atom(list);
651 }
652 }
653
654 static struct grep_expr *compile_pattern_and(struct grep_pat **list)
655 {
656 struct grep_pat *p;
657 struct grep_expr *x, *y;
658
659 x = compile_pattern_not(list);
660 p = *list;
661 if (p && p->token == GREP_AND) {
662 if (!x)
663 die("--and not preceded by pattern expression");
664 if (!p->next)
665 die("--and not followed by pattern expression");
666 *list = p->next;
667 y = compile_pattern_and(list);
668 if (!y)
669 die("--and not followed by pattern expression");
670 return grep_and_expr(x, y);
671 }
672 return x;
673 }
674
675 static struct grep_expr *compile_pattern_or(struct grep_pat **list)
676 {
677 struct grep_pat *p;
678 struct grep_expr *x, *y;
679
680 x = compile_pattern_and(list);
681 p = *list;
682 if (x && p && p->token != GREP_CLOSE_PAREN) {
683 y = compile_pattern_or(list);
684 if (!y)
685 die("not a pattern expression %s", p->pattern);
686 return grep_or_expr(x, y);
687 }
688 return x;
689 }
690
691 static struct grep_expr *compile_pattern_expr(struct grep_pat **list)
692 {
693 return compile_pattern_or(list);
694 }
695
696 static struct grep_expr *grep_true_expr(void)
697 {
698 struct grep_expr *z = xcalloc(1, sizeof(*z));
699 z->node = GREP_NODE_TRUE;
700 return z;
701 }
702
703 static struct grep_expr *prep_header_patterns(struct grep_opt *opt)
704 {
705 struct grep_pat *p;
706 struct grep_expr *header_expr;
707 struct grep_expr *(header_group[GREP_HEADER_FIELD_MAX]);
708 enum grep_header_field fld;
709
710 if (!opt->header_list)
711 return NULL;
712
713 for (p = opt->header_list; p; p = p->next) {
714 if (p->token != GREP_PATTERN_HEAD)
715 BUG("a non-header pattern in grep header list.");
716 if (p->field < GREP_HEADER_FIELD_MIN ||
717 GREP_HEADER_FIELD_MAX <= p->field)
718 BUG("unknown header field %d", p->field);
719 compile_regexp(p, opt);
720 }
721
722 for (fld = 0; fld < GREP_HEADER_FIELD_MAX; fld++)
723 header_group[fld] = NULL;
724
725 for (p = opt->header_list; p; p = p->next) {
726 struct grep_expr *h;
727 struct grep_pat *pp = p;
728
729 h = compile_pattern_atom(&pp);
730 if (!h || pp != p->next)
731 BUG("malformed header expr");
732 if (!header_group[p->field]) {
733 header_group[p->field] = h;
734 continue;
735 }
736 header_group[p->field] = grep_or_expr(h, header_group[p->field]);
737 }
738
739 header_expr = NULL;
740
741 for (fld = 0; fld < GREP_HEADER_FIELD_MAX; fld++) {
742 if (!header_group[fld])
743 continue;
744 if (!header_expr)
745 header_expr = grep_true_expr();
746 header_expr = grep_or_expr(header_group[fld], header_expr);
747 }
748 return header_expr;
749 }
750
751 static struct grep_expr *grep_splice_or(struct grep_expr *x, struct grep_expr *y)
752 {
753 struct grep_expr *z = x;
754
755 while (x) {
756 assert(x->node == GREP_NODE_OR);
757 if (x->u.binary.right &&
758 x->u.binary.right->node == GREP_NODE_TRUE) {
759 x->u.binary.right = y;
760 break;
761 }
762 x = x->u.binary.right;
763 }
764 return z;
765 }
766
767 void compile_grep_patterns(struct grep_opt *opt)
768 {
769 struct grep_pat *p;
770 struct grep_expr *header_expr = prep_header_patterns(opt);
771 int extended = 0;
772
773 for (p = opt->pattern_list; p; p = p->next) {
774 switch (p->token) {
775 case GREP_PATTERN: /* atom */
776 case GREP_PATTERN_HEAD:
777 case GREP_PATTERN_BODY:
778 compile_regexp(p, opt);
779 break;
780 default:
781 extended = 1;
782 break;
783 }
784 }
785
786 if (opt->all_match || opt->no_body_match || header_expr)
787 extended = 1;
788 else if (!extended)
789 return;
790
791 p = opt->pattern_list;
792 if (p)
793 opt->pattern_expression = compile_pattern_expr(&p);
794 if (p)
795 die("incomplete pattern expression group: %s", p->pattern);
796
797 if (opt->no_body_match && opt->pattern_expression)
798 opt->pattern_expression = grep_not_expr(opt->pattern_expression);
799
800 if (!header_expr)
801 return;
802
803 if (!opt->pattern_expression)
804 opt->pattern_expression = header_expr;
805 else if (opt->all_match)
806 opt->pattern_expression = grep_splice_or(header_expr,
807 opt->pattern_expression);
808 else
809 opt->pattern_expression = grep_or_expr(opt->pattern_expression,
810 header_expr);
811 opt->all_match = 1;
812 }
813
814 static void free_pattern_expr(struct grep_expr *x)
815 {
816 switch (x->node) {
817 case GREP_NODE_TRUE:
818 case GREP_NODE_ATOM:
819 break;
820 case GREP_NODE_NOT:
821 free_pattern_expr(x->u.unary);
822 break;
823 case GREP_NODE_AND:
824 case GREP_NODE_OR:
825 free_pattern_expr(x->u.binary.left);
826 free_pattern_expr(x->u.binary.right);
827 break;
828 }
829 free(x);
830 }
831
832 static void free_grep_pat(struct grep_pat *pattern)
833 {
834 struct grep_pat *p, *n;
835
836 for (p = pattern; p; p = n) {
837 n = p->next;
838 switch (p->token) {
839 case GREP_PATTERN: /* atom */
840 case GREP_PATTERN_HEAD:
841 case GREP_PATTERN_BODY:
842 if (p->pcre2_pattern)
843 free_pcre2_pattern(p);
844 else
845 regfree(&p->regexp);
846 free(p->pattern);
847 break;
848 default:
849 break;
850 }
851 free(p);
852 }
853 }
854
855 void free_grep_patterns(struct grep_opt *opt)
856 {
857 free_grep_pat(opt->pattern_list);
858 free_grep_pat(opt->header_list);
859
860 if (opt->pattern_expression)
861 free_pattern_expr(opt->pattern_expression);
862 }
863
864 static const char *end_of_line(const char *cp, unsigned long *left)
865 {
866 unsigned long l = *left;
867 while (l && *cp != '\n') {
868 l--;
869 cp++;
870 }
871 *left = l;
872 return cp;
873 }
874
875 static int word_char(char ch)
876 {
877 return isalnum(ch) || ch == '_';
878 }
879
880 static void output_color(struct grep_opt *opt, const void *data, size_t size,
881 const char *color)
882 {
883 if (want_color(opt->color) && color && color[0]) {
884 opt->output(opt, color, strlen(color));
885 opt->output(opt, data, size);
886 opt->output(opt, GIT_COLOR_RESET, strlen(GIT_COLOR_RESET));
887 } else
888 opt->output(opt, data, size);
889 }
890
891 static void output_sep(struct grep_opt *opt, char sign)
892 {
893 if (opt->null_following_name)
894 opt->output(opt, "\0", 1);
895 else
896 output_color(opt, &sign, 1, opt->colors[GREP_COLOR_SEP]);
897 }
898
899 static void show_name(struct grep_opt *opt, const char *name)
900 {
901 output_color(opt, name, strlen(name), opt->colors[GREP_COLOR_FILENAME]);
902 opt->output(opt, opt->null_following_name ? "\0" : "\n", 1);
903 }
904
905 static int patmatch(struct grep_pat *p,
906 const char *line, const char *eol,
907 regmatch_t *match, int eflags)
908 {
909 int hit;
910
911 if (p->pcre2_pattern)
912 hit = !pcre2match(p, line, eol, match, eflags);
913 else
914 hit = !regexec_buf(&p->regexp, line, eol - line, 1, match,
915 eflags);
916
917 return hit;
918 }
919
920 static void strip_timestamp(const char *bol, const char **eol_p)
921 {
922 const char *eol = *eol_p;
923
924 while (bol < --eol) {
925 if (*eol != '>')
926 continue;
927 *eol_p = ++eol;
928 break;
929 }
930 }
931
932 static struct {
933 const char *field;
934 size_t len;
935 } header_field[] = {
936 { "author ", 7 },
937 { "committer ", 10 },
938 { "reflog ", 7 },
939 };
940
941 static int headerless_match_one_pattern(struct grep_pat *p,
942 const char *bol, const char *eol,
943 enum grep_context ctx,
944 regmatch_t *pmatch, int eflags)
945 {
946 int hit = 0;
947 const char *start = bol;
948
949 if ((p->token != GREP_PATTERN) &&
950 ((p->token == GREP_PATTERN_HEAD) != (ctx == GREP_CONTEXT_HEAD)))
951 return 0;
952
953 again:
954 hit = patmatch(p, bol, eol, pmatch, eflags);
955
956 if (hit && p->word_regexp) {
957 if ((pmatch[0].rm_so < 0) ||
958 (eol - bol) < pmatch[0].rm_so ||
959 (pmatch[0].rm_eo < 0) ||
960 (eol - bol) < pmatch[0].rm_eo)
961 die("regexp returned nonsense");
962
963 /* Match beginning must be either beginning of the
964 * line, or at word boundary (i.e. the last char must
965 * not be a word char). Similarly, match end must be
966 * either end of the line, or at word boundary
967 * (i.e. the next char must not be a word char).
968 */
969 if ( ((pmatch[0].rm_so == 0) ||
970 !word_char(bol[pmatch[0].rm_so-1])) &&
971 ((pmatch[0].rm_eo == (eol-bol)) ||
972 !word_char(bol[pmatch[0].rm_eo])) )
973 ;
974 else
975 hit = 0;
976
977 /* Words consist of at least one character. */
978 if (pmatch->rm_so == pmatch->rm_eo)
979 hit = 0;
980
981 if (!hit && pmatch[0].rm_so + bol + 1 < eol) {
982 /* There could be more than one match on the
983 * line, and the first match might not be
984 * strict word match. But later ones could be!
985 * Forward to the next possible start, i.e. the
986 * next position following a non-word char.
987 */
988 bol = pmatch[0].rm_so + bol + 1;
989 while (word_char(bol[-1]) && bol < eol)
990 bol++;
991 eflags |= REG_NOTBOL;
992 if (bol < eol)
993 goto again;
994 }
995 }
996 if (hit) {
997 pmatch[0].rm_so += bol - start;
998 pmatch[0].rm_eo += bol - start;
999 }
1000 return hit;
1001 }
1002
1003 static int match_one_pattern(struct grep_pat *p,
1004 const char *bol, const char *eol,
1005 enum grep_context ctx, regmatch_t *pmatch,
1006 int eflags)
1007 {
1008 const char *field;
1009 size_t len;
1010
1011 if (p->token == GREP_PATTERN_HEAD) {
1012 assert(p->field < ARRAY_SIZE(header_field));
1013 field = header_field[p->field].field;
1014 len = header_field[p->field].len;
1015 if (strncmp(bol, field, len))
1016 return 0;
1017 bol += len;
1018
1019 switch (p->field) {
1020 case GREP_HEADER_AUTHOR:
1021 case GREP_HEADER_COMMITTER:
1022 strip_timestamp(bol, &eol);
1023 break;
1024 default:
1025 break;
1026 }
1027 }
1028
1029 return headerless_match_one_pattern(p, bol, eol, ctx, pmatch, eflags);
1030 }
1031
1032
1033 static int match_expr_eval(struct grep_opt *opt, struct grep_expr *x,
1034 const char *bol, const char *eol,
1035 enum grep_context ctx, ssize_t *col,
1036 ssize_t *icol, int collect_hits)
1037 {
1038 int h = 0;
1039
1040 switch (x->node) {
1041 case GREP_NODE_TRUE:
1042 h = 1;
1043 break;
1044 case GREP_NODE_ATOM:
1045 {
1046 regmatch_t tmp;
1047 h = match_one_pattern(x->u.atom, bol, eol, ctx,
1048 &tmp, 0);
1049 if (h && (*col < 0 || tmp.rm_so < *col))
1050 *col = tmp.rm_so;
1051 }
1052 if (x->u.atom->token == GREP_PATTERN_BODY)
1053 opt->body_hit |= h;
1054 break;
1055 case GREP_NODE_NOT:
1056 /*
1057 * Upon visiting a GREP_NODE_NOT, col and icol become swapped.
1058 */
1059 h = !match_expr_eval(opt, x->u.unary, bol, eol, ctx, icol, col,
1060 0);
1061 break;
1062 case GREP_NODE_AND:
1063 h = match_expr_eval(opt, x->u.binary.left, bol, eol, ctx, col,
1064 icol, 0);
1065 if (h || opt->columnnum) {
1066 /*
1067 * Don't short-circuit AND when given --column, since a
1068 * NOT earlier in the tree may turn this into an OR. In
1069 * this case, see the below comment.
1070 */
1071 h &= match_expr_eval(opt, x->u.binary.right, bol, eol,
1072 ctx, col, icol, 0);
1073 }
1074 break;
1075 case GREP_NODE_OR:
1076 if (!(collect_hits || opt->columnnum)) {
1077 /*
1078 * Don't short-circuit OR when given --column (or
1079 * collecting hits) to ensure we don't skip a later
1080 * child that would produce an earlier match.
1081 */
1082 return (match_expr_eval(opt, x->u.binary.left, bol, eol,
1083 ctx, col, icol, 0) ||
1084 match_expr_eval(opt, x->u.binary.right, bol,
1085 eol, ctx, col, icol, 0));
1086 }
1087 h = match_expr_eval(opt, x->u.binary.left, bol, eol, ctx, col,
1088 icol, 0);
1089 if (collect_hits)
1090 x->u.binary.left->hit |= h;
1091 h |= match_expr_eval(opt, x->u.binary.right, bol, eol, ctx, col,
1092 icol, collect_hits);
1093 break;
1094 default:
1095 die("Unexpected node type (internal error) %d", x->node);
1096 }
1097 if (collect_hits)
1098 x->hit |= h;
1099 return h;
1100 }
1101
1102 static int match_expr(struct grep_opt *opt,
1103 const char *bol, const char *eol,
1104 enum grep_context ctx, ssize_t *col,
1105 ssize_t *icol, int collect_hits)
1106 {
1107 struct grep_expr *x = opt->pattern_expression;
1108 return match_expr_eval(opt, x, bol, eol, ctx, col, icol, collect_hits);
1109 }
1110
1111 static int match_line(struct grep_opt *opt,
1112 const char *bol, const char *eol,
1113 ssize_t *col, ssize_t *icol,
1114 enum grep_context ctx, int collect_hits)
1115 {
1116 struct grep_pat *p;
1117 int hit = 0;
1118
1119 if (opt->pattern_expression)
1120 return match_expr(opt, bol, eol, ctx, col, icol,
1121 collect_hits);
1122
1123 /* we do not call with collect_hits without being extended */
1124 for (p = opt->pattern_list; p; p = p->next) {
1125 regmatch_t tmp;
1126 if (match_one_pattern(p, bol, eol, ctx, &tmp, 0)) {
1127 hit |= 1;
1128 if (!opt->columnnum) {
1129 /*
1130 * Without --column, any single match on a line
1131 * is enough to know that it needs to be
1132 * printed. With --column, scan _all_ patterns
1133 * to find the earliest.
1134 */
1135 break;
1136 }
1137 if (*col < 0 || tmp.rm_so < *col)
1138 *col = tmp.rm_so;
1139 }
1140 }
1141 return hit;
1142 }
1143
1144 static int match_next_pattern(struct grep_pat *p,
1145 const char *bol, const char *eol,
1146 enum grep_context ctx,
1147 regmatch_t *pmatch, int eflags)
1148 {
1149 regmatch_t match;
1150
1151 if (!headerless_match_one_pattern(p, bol, eol, ctx, &match, eflags))
1152 return 0;
1153 if (match.rm_so < 0 || match.rm_eo < 0)
1154 return 0;
1155 if (pmatch->rm_so >= 0 && pmatch->rm_eo >= 0) {
1156 if (match.rm_so > pmatch->rm_so)
1157 return 1;
1158 if (match.rm_so == pmatch->rm_so && match.rm_eo < pmatch->rm_eo)
1159 return 1;
1160 }
1161 pmatch->rm_so = match.rm_so;
1162 pmatch->rm_eo = match.rm_eo;
1163 return 1;
1164 }
1165
1166 int grep_next_match(struct grep_opt *opt,
1167 const char *bol, const char *eol,
1168 enum grep_context ctx, regmatch_t *pmatch,
1169 enum grep_header_field field, int eflags)
1170 {
1171 struct grep_pat *p;
1172 int hit = 0;
1173
1174 pmatch->rm_so = pmatch->rm_eo = -1;
1175 if (bol < eol) {
1176 for (p = ((ctx == GREP_CONTEXT_HEAD)
1177 ? opt->header_list : opt->pattern_list);
1178 p; p = p->next) {
1179 switch (p->token) {
1180 case GREP_PATTERN_HEAD:
1181 if ((field != GREP_HEADER_FIELD_MAX) &&
1182 (p->field != field))
1183 continue;
1184 /* fall thru */
1185 case GREP_PATTERN: /* atom */
1186 case GREP_PATTERN_BODY:
1187 hit |= match_next_pattern(p, bol, eol, ctx,
1188 pmatch, eflags);
1189 break;
1190 default:
1191 break;
1192 }
1193 }
1194 }
1195 return hit;
1196 }
1197
1198 static void show_line_header(struct grep_opt *opt, const char *name,
1199 unsigned lno, ssize_t cno, char sign)
1200 {
1201 if (opt->heading && opt->last_shown == 0) {
1202 output_color(opt, name, strlen(name), opt->colors[GREP_COLOR_FILENAME]);
1203 opt->output(opt, "\n", 1);
1204 }
1205 opt->last_shown = lno;
1206
1207 if (!opt->heading && opt->pathname) {
1208 output_color(opt, name, strlen(name), opt->colors[GREP_COLOR_FILENAME]);
1209 output_sep(opt, sign);
1210 }
1211 if (opt->linenum) {
1212 char buf[32];
1213 xsnprintf(buf, sizeof(buf), "%d", lno);
1214 output_color(opt, buf, strlen(buf), opt->colors[GREP_COLOR_LINENO]);
1215 output_sep(opt, sign);
1216 }
1217 /*
1218 * Treat 'cno' as the 1-indexed offset from the start of a non-context
1219 * line to its first match. Otherwise, 'cno' is 0 indicating that we are
1220 * being called with a context line.
1221 */
1222 if (opt->columnnum && cno) {
1223 char buf[32];
1224 xsnprintf(buf, sizeof(buf), "%"PRIuMAX, (uintmax_t)cno);
1225 output_color(opt, buf, strlen(buf), opt->colors[GREP_COLOR_COLUMNNO]);
1226 output_sep(opt, sign);
1227 }
1228 }
1229
1230 static void show_line(struct grep_opt *opt,
1231 const char *bol, const char *eol,
1232 const char *name, unsigned lno, ssize_t cno, char sign)
1233 {
1234 int rest = eol - bol;
1235 const char *match_color = NULL;
1236 const char *line_color = NULL;
1237
1238 if (opt->file_break && opt->last_shown == 0) {
1239 if (opt->show_hunk_mark)
1240 opt->output(opt, "\n", 1);
1241 } else if (opt->pre_context || opt->post_context || opt->funcbody) {
1242 if (opt->last_shown == 0) {
1243 if (opt->show_hunk_mark) {
1244 output_color(opt, "--", 2, opt->colors[GREP_COLOR_SEP]);
1245 opt->output(opt, "\n", 1);
1246 }
1247 } else if (lno > opt->last_shown + 1) {
1248 output_color(opt, "--", 2, opt->colors[GREP_COLOR_SEP]);
1249 opt->output(opt, "\n", 1);
1250 }
1251 }
1252 if (!opt->only_matching) {
1253 /*
1254 * In case the line we're being called with contains more than
1255 * one match, leave printing each header to the loop below.
1256 */
1257 show_line_header(opt, name, lno, cno, sign);
1258 }
1259 if (opt->color || opt->only_matching) {
1260 regmatch_t match;
1261 enum grep_context ctx = GREP_CONTEXT_BODY;
1262 int eflags = 0;
1263
1264 if (opt->color) {
1265 if (sign == ':')
1266 match_color = opt->colors[GREP_COLOR_MATCH_SELECTED];
1267 else
1268 match_color = opt->colors[GREP_COLOR_MATCH_CONTEXT];
1269 if (sign == ':')
1270 line_color = opt->colors[GREP_COLOR_SELECTED];
1271 else if (sign == '-')
1272 line_color = opt->colors[GREP_COLOR_CONTEXT];
1273 else if (sign == '=')
1274 line_color = opt->colors[GREP_COLOR_FUNCTION];
1275 }
1276 while (grep_next_match(opt, bol, eol, ctx, &match,
1277 GREP_HEADER_FIELD_MAX, eflags)) {
1278 if (match.rm_so == match.rm_eo)
1279 break;
1280
1281 if (opt->only_matching)
1282 show_line_header(opt, name, lno, cno, sign);
1283 else
1284 output_color(opt, bol, match.rm_so, line_color);
1285 output_color(opt, bol + match.rm_so,
1286 match.rm_eo - match.rm_so, match_color);
1287 if (opt->only_matching)
1288 opt->output(opt, "\n", 1);
1289 bol += match.rm_eo;
1290 cno += match.rm_eo;
1291 rest -= match.rm_eo;
1292 eflags = REG_NOTBOL;
1293 }
1294 }
1295 if (!opt->only_matching) {
1296 output_color(opt, bol, rest, line_color);
1297 opt->output(opt, "\n", 1);
1298 }
1299 }
1300
1301 int grep_use_locks;
1302
1303 /*
1304 * This lock protects access to the gitattributes machinery, which is
1305 * not thread-safe.
1306 */
1307 pthread_mutex_t grep_attr_mutex;
1308
1309 static inline void grep_attr_lock(void)
1310 {
1311 if (grep_use_locks)
1312 pthread_mutex_lock(&grep_attr_mutex);
1313 }
1314
1315 static inline void grep_attr_unlock(void)
1316 {
1317 if (grep_use_locks)
1318 pthread_mutex_unlock(&grep_attr_mutex);
1319 }
1320
1321 static int match_funcname(struct grep_opt *opt, struct grep_source *gs,
1322 const char *bol, const char *eol)
1323 {
1324 xdemitconf_t *xecfg = opt->priv;
1325 if (xecfg && !xecfg->find_func) {
1326 grep_source_load_driver(gs, opt->repo->index);
1327 if (gs->driver->funcname.pattern) {
1328 const struct userdiff_funcname *pe = &gs->driver->funcname;
1329 xdiff_set_find_func(xecfg, pe->pattern, pe->cflags);
1330 } else {
1331 xecfg = opt->priv = NULL;
1332 }
1333 }
1334
1335 if (xecfg) {
1336 char buf[1];
1337 return xecfg->find_func(bol, eol - bol, buf, 1,
1338 xecfg->find_func_priv) >= 0;
1339 }
1340
1341 if (bol == eol)
1342 return 0;
1343 if (isalpha(*bol) || *bol == '_' || *bol == '$')
1344 return 1;
1345 return 0;
1346 }
1347
1348 static void show_funcname_line(struct grep_opt *opt, struct grep_source *gs,
1349 const char *bol, unsigned lno)
1350 {
1351 while (bol > gs->buf) {
1352 const char *eol = --bol;
1353
1354 while (bol > gs->buf && bol[-1] != '\n')
1355 bol--;
1356 lno--;
1357
1358 if (lno <= opt->last_shown)
1359 break;
1360
1361 if (match_funcname(opt, gs, bol, eol)) {
1362 show_line(opt, bol, eol, gs->name, lno, 0, '=');
1363 break;
1364 }
1365 }
1366 }
1367
1368 static int is_empty_line(const char *bol, const char *eol);
1369
1370 static void show_pre_context(struct grep_opt *opt, struct grep_source *gs,
1371 const char *bol, const char *end, unsigned lno)
1372 {
1373 unsigned cur = lno, from = 1, funcname_lno = 0, orig_from;
1374 int funcname_needed = !!opt->funcname, comment_needed = 0;
1375
1376 if (opt->pre_context < lno)
1377 from = lno - opt->pre_context;
1378 if (from <= opt->last_shown)
1379 from = opt->last_shown + 1;
1380 orig_from = from;
1381 if (opt->funcbody) {
1382 if (match_funcname(opt, gs, bol, end))
1383 comment_needed = 1;
1384 else
1385 funcname_needed = 1;
1386 from = opt->last_shown + 1;
1387 }
1388
1389 /* Rewind. */
1390 while (bol > gs->buf && cur > from) {
1391 const char *next_bol = bol;
1392 const char *eol = --bol;
1393
1394 while (bol > gs->buf && bol[-1] != '\n')
1395 bol--;
1396 cur--;
1397 if (comment_needed && (is_empty_line(bol, eol) ||
1398 match_funcname(opt, gs, bol, eol))) {
1399 comment_needed = 0;
1400 from = orig_from;
1401 if (cur < from) {
1402 cur++;
1403 bol = next_bol;
1404 break;
1405 }
1406 }
1407 if (funcname_needed && match_funcname(opt, gs, bol, eol)) {
1408 funcname_lno = cur;
1409 funcname_needed = 0;
1410 if (opt->funcbody)
1411 comment_needed = 1;
1412 else
1413 from = orig_from;
1414 }
1415 }
1416
1417 /* We need to look even further back to find a function signature. */
1418 if (opt->funcname && funcname_needed)
1419 show_funcname_line(opt, gs, bol, cur);
1420
1421 /* Back forward. */
1422 while (cur < lno) {
1423 const char *eol = bol, sign = (cur == funcname_lno) ? '=' : '-';
1424
1425 while (*eol != '\n')
1426 eol++;
1427 show_line(opt, bol, eol, gs->name, cur, 0, sign);
1428 bol = eol + 1;
1429 cur++;
1430 }
1431 }
1432
1433 static int should_lookahead(struct grep_opt *opt)
1434 {
1435 struct grep_pat *p;
1436
1437 if (opt->pattern_expression)
1438 return 0; /* punt for too complex stuff */
1439 if (opt->invert)
1440 return 0;
1441 for (p = opt->pattern_list; p; p = p->next) {
1442 if (p->token != GREP_PATTERN)
1443 return 0; /* punt for "header only" and stuff */
1444 }
1445 return 1;
1446 }
1447
1448 static int look_ahead(struct grep_opt *opt,
1449 unsigned long *left_p,
1450 unsigned *lno_p,
1451 const char **bol_p)
1452 {
1453 unsigned lno = *lno_p;
1454 const char *bol = *bol_p;
1455 struct grep_pat *p;
1456 const char *sp, *last_bol;
1457 regoff_t earliest = -1;
1458
1459 for (p = opt->pattern_list; p; p = p->next) {
1460 int hit;
1461 regmatch_t m;
1462
1463 hit = patmatch(p, bol, bol + *left_p, &m, 0);
1464 if (!hit || m.rm_so < 0 || m.rm_eo < 0)
1465 continue;
1466 if (earliest < 0 || m.rm_so < earliest)
1467 earliest = m.rm_so;
1468 }
1469
1470 if (earliest < 0) {
1471 *bol_p = bol + *left_p;
1472 *left_p = 0;
1473 return 1;
1474 }
1475 for (sp = bol + earliest; bol < sp && sp[-1] != '\n'; sp--)
1476 ; /* find the beginning of the line */
1477 last_bol = sp;
1478
1479 for (sp = bol; sp < last_bol; sp++) {
1480 if (*sp == '\n')
1481 lno++;
1482 }
1483 *left_p -= last_bol - bol;
1484 *bol_p = last_bol;
1485 *lno_p = lno;
1486 return 0;
1487 }
1488
1489 static int fill_textconv_grep(struct repository *r,
1490 struct userdiff_driver *driver,
1491 struct grep_source *gs)
1492 {
1493 struct diff_filespec *df;
1494 char *buf;
1495 size_t size;
1496
1497 if (!driver || !driver->textconv)
1498 return grep_source_load(gs);
1499
1500 /*
1501 * The textconv interface is intimately tied to diff_filespecs, so we
1502 * have to pretend to be one. If we could unify the grep_source
1503 * and diff_filespec structs, this mess could just go away.
1504 */
1505 df = alloc_filespec(gs->path);
1506 switch (gs->type) {
1507 case GREP_SOURCE_OID:
1508 fill_filespec(df, gs->identifier, 1, 0100644);
1509 break;
1510 case GREP_SOURCE_FILE:
1511 fill_filespec(df, null_oid(), 0, 0100644);
1512 break;
1513 default:
1514 BUG("attempt to textconv something without a path?");
1515 }
1516
1517 /*
1518 * fill_textconv is not remotely thread-safe; it modifies the global
1519 * diff tempfile structure, writes to the_repo's odb and might
1520 * internally call thread-unsafe functions such as the
1521 * prepare_packed_git() lazy-initializator. Because of the last two, we
1522 * must ensure mutual exclusion between this call and the object reading
1523 * API, thus we use obj_read_lock() here.
1524 *
1525 * TODO: allowing text conversion to run in parallel with object
1526 * reading operations might increase performance in the multithreaded
1527 * non-worktreee git-grep with --textconv.
1528 */
1529 obj_read_lock();
1530 size = fill_textconv(r, driver, df, &buf);
1531 obj_read_unlock();
1532 free_filespec(df);
1533
1534 /*
1535 * The normal fill_textconv usage by the diff machinery would just keep
1536 * the textconv'd buf separate from the diff_filespec. But much of the
1537 * grep code passes around a grep_source and assumes that its "buf"
1538 * pointer is the beginning of the thing we are searching. So let's
1539 * install our textconv'd version into the grep_source, taking care not
1540 * to leak any existing buffer.
1541 */
1542 grep_source_clear_data(gs);
1543 gs->buf = buf;
1544 gs->size = size;
1545
1546 return 0;
1547 }
1548
1549 static int is_empty_line(const char *bol, const char *eol)
1550 {
1551 while (bol < eol && isspace(*bol))
1552 bol++;
1553 return bol == eol;
1554 }
1555
1556 static int grep_source_1(struct grep_opt *opt, struct grep_source *gs, int collect_hits)
1557 {
1558 const char *bol;
1559 const char *peek_bol = NULL;
1560 unsigned long left;
1561 unsigned lno = 1;
1562 unsigned last_hit = 0;
1563 int binary_match_only = 0;
1564 unsigned count = 0;
1565 int try_lookahead = 0;
1566 int show_function = 0;
1567 struct userdiff_driver *textconv = NULL;
1568 enum grep_context ctx = GREP_CONTEXT_HEAD;
1569 xdemitconf_t xecfg;
1570
1571 if (!opt->status_only && gs->name == NULL)
1572 BUG("grep call which could print a name requires "
1573 "grep_source.name be non-NULL");
1574
1575 if (!opt->output)
1576 opt->output = std_output;
1577
1578 if (opt->pre_context || opt->post_context || opt->file_break ||
1579 opt->funcbody) {
1580 /* Show hunk marks, except for the first file. */
1581 if (opt->last_shown)
1582 opt->show_hunk_mark = 1;
1583 /*
1584 * If we're using threads then we can't easily identify
1585 * the first file. Always put hunk marks in that case
1586 * and skip the very first one later in work_done().
1587 */
1588 if (opt->output != std_output)
1589 opt->show_hunk_mark = 1;
1590 }
1591 opt->last_shown = 0;
1592
1593 if (opt->allow_textconv) {
1594 grep_source_load_driver(gs, opt->repo->index);
1595 /*
1596 * We might set up the shared textconv cache data here, which
1597 * is not thread-safe. Also, get_oid_with_context() and
1598 * parse_object() might be internally called. As they are not
1599 * currently thread-safe and might be racy with object reading,
1600 * obj_read_lock() must be called.
1601 */
1602 grep_attr_lock();
1603 obj_read_lock();
1604 textconv = userdiff_get_textconv(opt->repo, gs->driver);
1605 obj_read_unlock();
1606 grep_attr_unlock();
1607 }
1608
1609 /*
1610 * We know the result of a textconv is text, so we only have to care
1611 * about binary handling if we are not using it.
1612 */
1613 if (!textconv) {
1614 switch (opt->binary) {
1615 case GREP_BINARY_DEFAULT:
1616 if (grep_source_is_binary(gs, opt->repo->index))
1617 binary_match_only = 1;
1618 break;
1619 case GREP_BINARY_NOMATCH:
1620 if (grep_source_is_binary(gs, opt->repo->index))
1621 return 0; /* Assume unmatch */
1622 break;
1623 case GREP_BINARY_TEXT:
1624 break;
1625 default:
1626 BUG("unknown binary handling mode");
1627 }
1628 }
1629
1630 memset(&xecfg, 0, sizeof(xecfg));
1631 opt->priv = &xecfg;
1632
1633 try_lookahead = should_lookahead(opt);
1634
1635 if (fill_textconv_grep(opt->repo, textconv, gs) < 0)
1636 return 0;
1637
1638 bol = gs->buf;
1639 left = gs->size;
1640 while (left) {
1641 const char *eol;
1642 int hit;
1643 ssize_t cno;
1644 ssize_t col = -1, icol = -1;
1645
1646 /*
1647 * look_ahead() skips quickly to the line that possibly
1648 * has the next hit; don't call it if we need to do
1649 * something more than just skipping the current line
1650 * in response to an unmatch for the current line. E.g.
1651 * inside a post-context window, we will show the current
1652 * line as a context around the previous hit when it
1653 * doesn't hit.
1654 */
1655 if (try_lookahead
1656 && !(last_hit
1657 && (show_function ||
1658 lno <= last_hit + opt->post_context))
1659 && look_ahead(opt, &left, &lno, &bol))
1660 break;
1661 eol = end_of_line(bol, &left);
1662
1663 if ((ctx == GREP_CONTEXT_HEAD) && (eol == bol))
1664 ctx = GREP_CONTEXT_BODY;
1665
1666 hit = match_line(opt, bol, eol, &col, &icol, ctx, collect_hits);
1667
1668 if (collect_hits)
1669 goto next_line;
1670
1671 /* "grep -v -e foo -e bla" should list lines
1672 * that do not have either, so inversion should
1673 * be done outside.
1674 */
1675 if (opt->invert)
1676 hit = !hit;
1677 if (opt->unmatch_name_only) {
1678 if (hit)
1679 return 0;
1680 goto next_line;
1681 }
1682 if (hit && (opt->max_count < 0 || count < opt->max_count)) {
1683 count++;
1684 if (opt->status_only)
1685 return 1;
1686 if (opt->name_only) {
1687 show_name(opt, gs->name);
1688 return 1;
1689 }
1690 if (opt->count)
1691 goto next_line;
1692 if (binary_match_only) {
1693 opt->output(opt, "Binary file ", 12);
1694 output_color(opt, gs->name, strlen(gs->name),
1695 opt->colors[GREP_COLOR_FILENAME]);
1696 opt->output(opt, " matches\n", 9);
1697 return 1;
1698 }
1699 /* Hit at this line. If we haven't shown the
1700 * pre-context lines, we would need to show them.
1701 */
1702 if (opt->pre_context || opt->funcbody)
1703 show_pre_context(opt, gs, bol, eol, lno);
1704 else if (opt->funcname)
1705 show_funcname_line(opt, gs, bol, lno);
1706 cno = opt->invert ? icol : col;
1707 if (cno < 0) {
1708 /*
1709 * A negative cno indicates that there was no
1710 * match on the line. We are thus inverted and
1711 * being asked to show all lines that _don't_
1712 * match a given expression. Therefore, set cno
1713 * to 0 to suggest the whole line matches.
1714 */
1715 cno = 0;
1716 }
1717 show_line(opt, bol, eol, gs->name, lno, cno + 1, ':');
1718 last_hit = lno;
1719 if (opt->funcbody)
1720 show_function = 1;
1721 goto next_line;
1722 }
1723 if (show_function && (!peek_bol || peek_bol < bol)) {
1724 unsigned long peek_left = left;
1725 const char *peek_eol = eol;
1726
1727 /*
1728 * Trailing empty lines are not interesting.
1729 * Peek past them to see if they belong to the
1730 * body of the current function.
1731 */
1732 peek_bol = bol;
1733 while (is_empty_line(peek_bol, peek_eol)) {
1734 peek_bol = peek_eol + 1;
1735 peek_eol = end_of_line(peek_bol, &peek_left);
1736 }
1737
1738 if (peek_bol >= gs->buf + gs->size ||
1739 match_funcname(opt, gs, peek_bol, peek_eol))
1740 show_function = 0;
1741 }
1742 if (show_function ||
1743 (last_hit && lno <= last_hit + opt->post_context)) {
1744 /* If the last hit is within the post context,
1745 * we need to show this line.
1746 */
1747 show_line(opt, bol, eol, gs->name, lno, col + 1, '-');
1748 }
1749
1750 next_line:
1751 bol = eol + 1;
1752 if (!left)
1753 break;
1754 left--;
1755 lno++;
1756 }
1757
1758 if (collect_hits)
1759 return 0;
1760
1761 if (opt->status_only)
1762 return opt->unmatch_name_only;
1763 if (opt->unmatch_name_only) {
1764 /* We did not see any hit, so we want to show this */
1765 show_name(opt, gs->name);
1766 return 1;
1767 }
1768
1769 xdiff_clear_find_func(&xecfg);
1770 opt->priv = NULL;
1771
1772 /* NEEDSWORK:
1773 * The real "grep -c foo *.c" gives many "bar.c:0" lines,
1774 * which feels mostly useless but sometimes useful. Maybe
1775 * make it another option? For now suppress them.
1776 */
1777 if (opt->count && count) {
1778 char buf[32];
1779 if (opt->pathname) {
1780 output_color(opt, gs->name, strlen(gs->name),
1781 opt->colors[GREP_COLOR_FILENAME]);
1782 output_sep(opt, ':');
1783 }
1784 xsnprintf(buf, sizeof(buf), "%u\n", count);
1785 opt->output(opt, buf, strlen(buf));
1786 return 1;
1787 }
1788 return !!last_hit;
1789 }
1790
1791 static void clr_hit_marker(struct grep_expr *x)
1792 {
1793 /* All-hit markers are meaningful only at the very top level
1794 * OR node.
1795 */
1796 while (1) {
1797 x->hit = 0;
1798 if (x->node != GREP_NODE_OR)
1799 return;
1800 x->u.binary.left->hit = 0;
1801 x = x->u.binary.right;
1802 }
1803 }
1804
1805 static int chk_hit_marker(struct grep_expr *x)
1806 {
1807 /* Top level nodes have hit markers. See if they all are hits */
1808 while (1) {
1809 if (x->node != GREP_NODE_OR)
1810 return x->hit;
1811 if (!x->u.binary.left->hit)
1812 return 0;
1813 x = x->u.binary.right;
1814 }
1815 }
1816
1817 int grep_source(struct grep_opt *opt, struct grep_source *gs)
1818 {
1819 /*
1820 * we do not have to do the two-pass grep when we do not check
1821 * buffer-wide "all-match".
1822 */
1823 if (!opt->all_match && !opt->no_body_match)
1824 return grep_source_1(opt, gs, 0);
1825
1826 /* Otherwise the toplevel "or" terms hit a bit differently.
1827 * We first clear hit markers from them.
1828 */
1829 clr_hit_marker(opt->pattern_expression);
1830 opt->body_hit = 0;
1831 grep_source_1(opt, gs, 1);
1832
1833 if (opt->all_match && !chk_hit_marker(opt->pattern_expression))
1834 return 0;
1835 if (opt->no_body_match && opt->body_hit)
1836 return 0;
1837
1838 return grep_source_1(opt, gs, 0);
1839 }
1840
1841 static void grep_source_init_buf(struct grep_source *gs,
1842 const char *buf,
1843 unsigned long size)
1844 {
1845 gs->type = GREP_SOURCE_BUF;
1846 gs->name = NULL;
1847 gs->path = NULL;
1848 gs->buf = buf;
1849 gs->size = size;
1850 gs->driver = NULL;
1851 gs->identifier = NULL;
1852 }
1853
1854 int grep_buffer(struct grep_opt *opt, const char *buf, unsigned long size)
1855 {
1856 struct grep_source gs;
1857 int r;
1858
1859 grep_source_init_buf(&gs, buf, size);
1860
1861 r = grep_source(opt, &gs);
1862
1863 grep_source_clear(&gs);
1864 return r;
1865 }
1866
1867 void grep_source_init_file(struct grep_source *gs, const char *name,
1868 const char *path)
1869 {
1870 gs->type = GREP_SOURCE_FILE;
1871 gs->name = xstrdup_or_null(name);
1872 gs->path = xstrdup_or_null(path);
1873 gs->buf = NULL;
1874 gs->size = 0;
1875 gs->driver = NULL;
1876 gs->identifier = xstrdup(path);
1877 }
1878
1879 void grep_source_init_oid(struct grep_source *gs, const char *name,
1880 const char *path, const struct object_id *oid,
1881 struct repository *repo)
1882 {
1883 gs->type = GREP_SOURCE_OID;
1884 gs->name = xstrdup_or_null(name);
1885 gs->path = xstrdup_or_null(path);
1886 gs->buf = NULL;
1887 gs->size = 0;
1888 gs->driver = NULL;
1889 gs->identifier = oiddup(oid);
1890 gs->repo = repo;
1891 }
1892
1893 void grep_source_clear(struct grep_source *gs)
1894 {
1895 FREE_AND_NULL(gs->name);
1896 FREE_AND_NULL(gs->path);
1897 FREE_AND_NULL(gs->identifier);
1898 grep_source_clear_data(gs);
1899 }
1900
1901 void grep_source_clear_data(struct grep_source *gs)
1902 {
1903 switch (gs->type) {
1904 case GREP_SOURCE_FILE:
1905 case GREP_SOURCE_OID:
1906 /* these types own the buffer */
1907 free((char *)gs->buf);
1908 gs->buf = NULL;
1909 gs->size = 0;
1910 break;
1911 case GREP_SOURCE_BUF:
1912 /* leave user-provided buf intact */
1913 break;
1914 }
1915 }
1916
1917 static int grep_source_load_oid(struct grep_source *gs)
1918 {
1919 enum object_type type;
1920
1921 gs->buf = repo_read_object_file(gs->repo, gs->identifier, &type,
1922 &gs->size);
1923 if (!gs->buf)
1924 return error(_("'%s': unable to read %s"),
1925 gs->name,
1926 oid_to_hex(gs->identifier));
1927 return 0;
1928 }
1929
1930 static int grep_source_load_file(struct grep_source *gs)
1931 {
1932 const char *filename = gs->identifier;
1933 struct stat st;
1934 char *data;
1935 size_t size;
1936 int i;
1937
1938 if (lstat(filename, &st) < 0) {
1939 err_ret:
1940 if (errno != ENOENT)
1941 error_errno(_("failed to stat '%s'"), filename);
1942 return -1;
1943 }
1944 if (!S_ISREG(st.st_mode))
1945 return -1;
1946 size = xsize_t(st.st_size);
1947 i = open(filename, O_RDONLY);
1948 if (i < 0)
1949 goto err_ret;
1950 data = xmallocz(size);
1951 if (st.st_size != read_in_full(i, data, size)) {
1952 error_errno(_("'%s': short read"), filename);
1953 close(i);
1954 free(data);
1955 return -1;
1956 }
1957 close(i);
1958
1959 gs->buf = data;
1960 gs->size = size;
1961 return 0;
1962 }
1963
1964 static int grep_source_load(struct grep_source *gs)
1965 {
1966 if (gs->buf)
1967 return 0;
1968
1969 switch (gs->type) {
1970 case GREP_SOURCE_FILE:
1971 return grep_source_load_file(gs);
1972 case GREP_SOURCE_OID:
1973 return grep_source_load_oid(gs);
1974 case GREP_SOURCE_BUF:
1975 return gs->buf ? 0 : -1;
1976 }
1977 BUG("invalid grep_source type to load");
1978 }
1979
1980 void grep_source_load_driver(struct grep_source *gs,
1981 struct index_state *istate)
1982 {
1983 if (gs->driver)
1984 return;
1985
1986 grep_attr_lock();
1987 if (gs->path)
1988 gs->driver = userdiff_find_by_path(istate, gs->path);
1989 if (!gs->driver)
1990 gs->driver = userdiff_find_by_name("default");
1991 grep_attr_unlock();
1992 }
1993
1994 static int grep_source_is_binary(struct grep_source *gs,
1995 struct index_state *istate)
1996 {
1997 grep_source_load_driver(gs, istate);
1998 if (gs->driver->binary != -1)
1999 return gs->driver->binary;
2000
2001 if (!grep_source_load(gs))
2002 return buffer_is_binary(gs->buf, gs->size);
2003
2004 return 0;
2005 }
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