mingw: implement getppid
[git/kusma.git] / grep.c
blob82fb349be6f6ef8211d4828101cd8e88bcbb304f
1 #include "cache.h"
2 #include "grep.h"
3 #include "userdiff.h"
4 #include "xdiff-interface.h"
6 void append_header_grep_pattern(struct grep_opt *opt, enum grep_header_field field, const char *pat)
8 struct grep_pat *p = xcalloc(1, sizeof(*p));
9 p->pattern = pat;
10 p->patternlen = strlen(pat);
11 p->origin = "header";
12 p->no = 0;
13 p->token = GREP_PATTERN_HEAD;
14 p->field = field;
15 *opt->header_tail = p;
16 opt->header_tail = &p->next;
17 p->next = NULL;
20 void append_grep_pattern(struct grep_opt *opt, const char *pat,
21 const char *origin, int no, enum grep_pat_token t)
23 append_grep_pat(opt, pat, strlen(pat), origin, no, t);
26 void append_grep_pat(struct grep_opt *opt, const char *pat, size_t patlen,
27 const char *origin, int no, enum grep_pat_token t)
29 struct grep_pat *p = xcalloc(1, sizeof(*p));
30 p->pattern = pat;
31 p->patternlen = patlen;
32 p->origin = origin;
33 p->no = no;
34 p->token = t;
35 *opt->pattern_tail = p;
36 opt->pattern_tail = &p->next;
37 p->next = NULL;
40 struct grep_opt *grep_opt_dup(const struct grep_opt *opt)
42 struct grep_pat *pat;
43 struct grep_opt *ret = xmalloc(sizeof(struct grep_opt));
44 *ret = *opt;
46 ret->pattern_list = NULL;
47 ret->pattern_tail = &ret->pattern_list;
49 for(pat = opt->pattern_list; pat != NULL; pat = pat->next)
51 if(pat->token == GREP_PATTERN_HEAD)
52 append_header_grep_pattern(ret, pat->field,
53 pat->pattern);
54 else
55 append_grep_pat(ret, pat->pattern, pat->patternlen,
56 pat->origin, pat->no, pat->token);
59 return ret;
62 static void compile_regexp(struct grep_pat *p, struct grep_opt *opt)
64 int err;
66 p->word_regexp = opt->word_regexp;
67 p->ignore_case = opt->ignore_case;
68 p->fixed = opt->fixed;
70 if (p->fixed)
71 return;
73 err = regcomp(&p->regexp, p->pattern, opt->regflags);
74 if (err) {
75 char errbuf[1024];
76 char where[1024];
77 if (p->no)
78 sprintf(where, "In '%s' at %d, ",
79 p->origin, p->no);
80 else if (p->origin)
81 sprintf(where, "%s, ", p->origin);
82 else
83 where[0] = 0;
84 regerror(err, &p->regexp, errbuf, 1024);
85 regfree(&p->regexp);
86 die("%s'%s': %s", where, p->pattern, errbuf);
90 static struct grep_expr *compile_pattern_or(struct grep_pat **);
91 static struct grep_expr *compile_pattern_atom(struct grep_pat **list)
93 struct grep_pat *p;
94 struct grep_expr *x;
96 p = *list;
97 if (!p)
98 return NULL;
99 switch (p->token) {
100 case GREP_PATTERN: /* atom */
101 case GREP_PATTERN_HEAD:
102 case GREP_PATTERN_BODY:
103 x = xcalloc(1, sizeof (struct grep_expr));
104 x->node = GREP_NODE_ATOM;
105 x->u.atom = p;
106 *list = p->next;
107 return x;
108 case GREP_OPEN_PAREN:
109 *list = p->next;
110 x = compile_pattern_or(list);
111 if (!*list || (*list)->token != GREP_CLOSE_PAREN)
112 die("unmatched parenthesis");
113 *list = (*list)->next;
114 return x;
115 default:
116 return NULL;
120 static struct grep_expr *compile_pattern_not(struct grep_pat **list)
122 struct grep_pat *p;
123 struct grep_expr *x;
125 p = *list;
126 if (!p)
127 return NULL;
128 switch (p->token) {
129 case GREP_NOT:
130 if (!p->next)
131 die("--not not followed by pattern expression");
132 *list = p->next;
133 x = xcalloc(1, sizeof (struct grep_expr));
134 x->node = GREP_NODE_NOT;
135 x->u.unary = compile_pattern_not(list);
136 if (!x->u.unary)
137 die("--not followed by non pattern expression");
138 return x;
139 default:
140 return compile_pattern_atom(list);
144 static struct grep_expr *compile_pattern_and(struct grep_pat **list)
146 struct grep_pat *p;
147 struct grep_expr *x, *y, *z;
149 x = compile_pattern_not(list);
150 p = *list;
151 if (p && p->token == GREP_AND) {
152 if (!p->next)
153 die("--and not followed by pattern expression");
154 *list = p->next;
155 y = compile_pattern_and(list);
156 if (!y)
157 die("--and not followed by pattern expression");
158 z = xcalloc(1, sizeof (struct grep_expr));
159 z->node = GREP_NODE_AND;
160 z->u.binary.left = x;
161 z->u.binary.right = y;
162 return z;
164 return x;
167 static struct grep_expr *compile_pattern_or(struct grep_pat **list)
169 struct grep_pat *p;
170 struct grep_expr *x, *y, *z;
172 x = compile_pattern_and(list);
173 p = *list;
174 if (x && p && p->token != GREP_CLOSE_PAREN) {
175 y = compile_pattern_or(list);
176 if (!y)
177 die("not a pattern expression %s", p->pattern);
178 z = xcalloc(1, sizeof (struct grep_expr));
179 z->node = GREP_NODE_OR;
180 z->u.binary.left = x;
181 z->u.binary.right = y;
182 return z;
184 return x;
187 static struct grep_expr *compile_pattern_expr(struct grep_pat **list)
189 return compile_pattern_or(list);
192 void compile_grep_patterns(struct grep_opt *opt)
194 struct grep_pat *p;
195 struct grep_expr *header_expr = NULL;
197 if (opt->header_list) {
198 p = opt->header_list;
199 header_expr = compile_pattern_expr(&p);
200 if (p)
201 die("incomplete pattern expression: %s", p->pattern);
202 for (p = opt->header_list; p; p = p->next) {
203 switch (p->token) {
204 case GREP_PATTERN: /* atom */
205 case GREP_PATTERN_HEAD:
206 case GREP_PATTERN_BODY:
207 compile_regexp(p, opt);
208 break;
209 default:
210 opt->extended = 1;
211 break;
216 for (p = opt->pattern_list; p; p = p->next) {
217 switch (p->token) {
218 case GREP_PATTERN: /* atom */
219 case GREP_PATTERN_HEAD:
220 case GREP_PATTERN_BODY:
221 compile_regexp(p, opt);
222 break;
223 default:
224 opt->extended = 1;
225 break;
229 if (opt->all_match || header_expr)
230 opt->extended = 1;
231 else if (!opt->extended)
232 return;
234 /* Then bundle them up in an expression.
235 * A classic recursive descent parser would do.
237 p = opt->pattern_list;
238 if (p)
239 opt->pattern_expression = compile_pattern_expr(&p);
240 if (p)
241 die("incomplete pattern expression: %s", p->pattern);
243 if (!header_expr)
244 return;
246 if (opt->pattern_expression) {
247 struct grep_expr *z;
248 z = xcalloc(1, sizeof(*z));
249 z->node = GREP_NODE_OR;
250 z->u.binary.left = opt->pattern_expression;
251 z->u.binary.right = header_expr;
252 opt->pattern_expression = z;
253 } else {
254 opt->pattern_expression = header_expr;
256 opt->all_match = 1;
259 static void free_pattern_expr(struct grep_expr *x)
261 switch (x->node) {
262 case GREP_NODE_ATOM:
263 break;
264 case GREP_NODE_NOT:
265 free_pattern_expr(x->u.unary);
266 break;
267 case GREP_NODE_AND:
268 case GREP_NODE_OR:
269 free_pattern_expr(x->u.binary.left);
270 free_pattern_expr(x->u.binary.right);
271 break;
273 free(x);
276 void free_grep_patterns(struct grep_opt *opt)
278 struct grep_pat *p, *n;
280 for (p = opt->pattern_list; p; p = n) {
281 n = p->next;
282 switch (p->token) {
283 case GREP_PATTERN: /* atom */
284 case GREP_PATTERN_HEAD:
285 case GREP_PATTERN_BODY:
286 regfree(&p->regexp);
287 break;
288 default:
289 break;
291 free(p);
294 if (!opt->extended)
295 return;
296 free_pattern_expr(opt->pattern_expression);
299 static char *end_of_line(char *cp, unsigned long *left)
301 unsigned long l = *left;
302 while (l && *cp != '\n') {
303 l--;
304 cp++;
306 *left = l;
307 return cp;
310 static int word_char(char ch)
312 return isalnum(ch) || ch == '_';
315 static void output_color(struct grep_opt *opt, const void *data, size_t size,
316 const char *color)
318 if (opt->color && color && color[0]) {
319 opt->output(opt, color, strlen(color));
320 opt->output(opt, data, size);
321 opt->output(opt, GIT_COLOR_RESET, strlen(GIT_COLOR_RESET));
322 } else
323 opt->output(opt, data, size);
326 static void output_sep(struct grep_opt *opt, char sign)
328 if (opt->null_following_name)
329 opt->output(opt, "\0", 1);
330 else
331 output_color(opt, &sign, 1, opt->color_sep);
334 static void show_name(struct grep_opt *opt, const char *name)
336 output_color(opt, name, strlen(name), opt->color_filename);
337 opt->output(opt, opt->null_following_name ? "\0" : "\n", 1);
340 static int fixmatch(struct grep_pat *p, char *line, char *eol,
341 regmatch_t *match)
343 char *hit;
345 if (p->ignore_case) {
346 char *s = line;
347 do {
348 hit = strcasestr(s, p->pattern);
349 if (hit)
350 break;
351 s += strlen(s) + 1;
352 } while (s < eol);
353 } else
354 hit = memmem(line, eol - line, p->pattern, p->patternlen);
356 if (!hit) {
357 match->rm_so = match->rm_eo = -1;
358 return REG_NOMATCH;
360 else {
361 match->rm_so = hit - line;
362 match->rm_eo = match->rm_so + p->patternlen;
363 return 0;
367 static int regmatch(const regex_t *preg, char *line, char *eol,
368 regmatch_t *match, int eflags)
370 #ifdef REG_STARTEND
371 match->rm_so = 0;
372 match->rm_eo = eol - line;
373 eflags |= REG_STARTEND;
374 #endif
375 return regexec(preg, line, 1, match, eflags);
378 static int strip_timestamp(char *bol, char **eol_p)
380 char *eol = *eol_p;
381 int ch;
383 while (bol < --eol) {
384 if (*eol != '>')
385 continue;
386 *eol_p = ++eol;
387 ch = *eol;
388 *eol = '\0';
389 return ch;
391 return 0;
394 static struct {
395 const char *field;
396 size_t len;
397 } header_field[] = {
398 { "author ", 7 },
399 { "committer ", 10 },
402 static int match_one_pattern(struct grep_pat *p, char *bol, char *eol,
403 enum grep_context ctx,
404 regmatch_t *pmatch, int eflags)
406 int hit = 0;
407 int saved_ch = 0;
408 const char *start = bol;
410 if ((p->token != GREP_PATTERN) &&
411 ((p->token == GREP_PATTERN_HEAD) != (ctx == GREP_CONTEXT_HEAD)))
412 return 0;
414 if (p->token == GREP_PATTERN_HEAD) {
415 const char *field;
416 size_t len;
417 assert(p->field < ARRAY_SIZE(header_field));
418 field = header_field[p->field].field;
419 len = header_field[p->field].len;
420 if (strncmp(bol, field, len))
421 return 0;
422 bol += len;
423 saved_ch = strip_timestamp(bol, &eol);
426 again:
427 if (p->fixed)
428 hit = !fixmatch(p, bol, eol, pmatch);
429 else
430 hit = !regmatch(&p->regexp, bol, eol, pmatch, eflags);
432 if (hit && p->word_regexp) {
433 if ((pmatch[0].rm_so < 0) ||
434 (eol - bol) < pmatch[0].rm_so ||
435 (pmatch[0].rm_eo < 0) ||
436 (eol - bol) < pmatch[0].rm_eo)
437 die("regexp returned nonsense");
439 /* Match beginning must be either beginning of the
440 * line, or at word boundary (i.e. the last char must
441 * not be a word char). Similarly, match end must be
442 * either end of the line, or at word boundary
443 * (i.e. the next char must not be a word char).
445 if ( ((pmatch[0].rm_so == 0) ||
446 !word_char(bol[pmatch[0].rm_so-1])) &&
447 ((pmatch[0].rm_eo == (eol-bol)) ||
448 !word_char(bol[pmatch[0].rm_eo])) )
450 else
451 hit = 0;
453 /* Words consist of at least one character. */
454 if (pmatch->rm_so == pmatch->rm_eo)
455 hit = 0;
457 if (!hit && pmatch[0].rm_so + bol + 1 < eol) {
458 /* There could be more than one match on the
459 * line, and the first match might not be
460 * strict word match. But later ones could be!
461 * Forward to the next possible start, i.e. the
462 * next position following a non-word char.
464 bol = pmatch[0].rm_so + bol + 1;
465 while (word_char(bol[-1]) && bol < eol)
466 bol++;
467 eflags |= REG_NOTBOL;
468 if (bol < eol)
469 goto again;
472 if (p->token == GREP_PATTERN_HEAD && saved_ch)
473 *eol = saved_ch;
474 if (hit) {
475 pmatch[0].rm_so += bol - start;
476 pmatch[0].rm_eo += bol - start;
478 return hit;
481 static int match_expr_eval(struct grep_expr *x, char *bol, char *eol,
482 enum grep_context ctx, int collect_hits)
484 int h = 0;
485 regmatch_t match;
487 if (!x)
488 die("Not a valid grep expression");
489 switch (x->node) {
490 case GREP_NODE_ATOM:
491 h = match_one_pattern(x->u.atom, bol, eol, ctx, &match, 0);
492 break;
493 case GREP_NODE_NOT:
494 h = !match_expr_eval(x->u.unary, bol, eol, ctx, 0);
495 break;
496 case GREP_NODE_AND:
497 if (!match_expr_eval(x->u.binary.left, bol, eol, ctx, 0))
498 return 0;
499 h = match_expr_eval(x->u.binary.right, bol, eol, ctx, 0);
500 break;
501 case GREP_NODE_OR:
502 if (!collect_hits)
503 return (match_expr_eval(x->u.binary.left,
504 bol, eol, ctx, 0) ||
505 match_expr_eval(x->u.binary.right,
506 bol, eol, ctx, 0));
507 h = match_expr_eval(x->u.binary.left, bol, eol, ctx, 0);
508 x->u.binary.left->hit |= h;
509 h |= match_expr_eval(x->u.binary.right, bol, eol, ctx, 1);
510 break;
511 default:
512 die("Unexpected node type (internal error) %d", x->node);
514 if (collect_hits)
515 x->hit |= h;
516 return h;
519 static int match_expr(struct grep_opt *opt, char *bol, char *eol,
520 enum grep_context ctx, int collect_hits)
522 struct grep_expr *x = opt->pattern_expression;
523 return match_expr_eval(x, bol, eol, ctx, collect_hits);
526 static int match_line(struct grep_opt *opt, char *bol, char *eol,
527 enum grep_context ctx, int collect_hits)
529 struct grep_pat *p;
530 regmatch_t match;
532 if (opt->extended)
533 return match_expr(opt, bol, eol, ctx, collect_hits);
535 /* we do not call with collect_hits without being extended */
536 for (p = opt->pattern_list; p; p = p->next) {
537 if (match_one_pattern(p, bol, eol, ctx, &match, 0))
538 return 1;
540 return 0;
543 static int match_next_pattern(struct grep_pat *p, char *bol, char *eol,
544 enum grep_context ctx,
545 regmatch_t *pmatch, int eflags)
547 regmatch_t match;
549 if (!match_one_pattern(p, bol, eol, ctx, &match, eflags))
550 return 0;
551 if (match.rm_so < 0 || match.rm_eo < 0)
552 return 0;
553 if (pmatch->rm_so >= 0 && pmatch->rm_eo >= 0) {
554 if (match.rm_so > pmatch->rm_so)
555 return 1;
556 if (match.rm_so == pmatch->rm_so && match.rm_eo < pmatch->rm_eo)
557 return 1;
559 pmatch->rm_so = match.rm_so;
560 pmatch->rm_eo = match.rm_eo;
561 return 1;
564 static int next_match(struct grep_opt *opt, char *bol, char *eol,
565 enum grep_context ctx, regmatch_t *pmatch, int eflags)
567 struct grep_pat *p;
568 int hit = 0;
570 pmatch->rm_so = pmatch->rm_eo = -1;
571 if (bol < eol) {
572 for (p = opt->pattern_list; p; p = p->next) {
573 switch (p->token) {
574 case GREP_PATTERN: /* atom */
575 case GREP_PATTERN_HEAD:
576 case GREP_PATTERN_BODY:
577 hit |= match_next_pattern(p, bol, eol, ctx,
578 pmatch, eflags);
579 break;
580 default:
581 break;
585 return hit;
588 static void show_line(struct grep_opt *opt, char *bol, char *eol,
589 const char *name, unsigned lno, char sign)
591 int rest = eol - bol;
592 char *line_color = NULL;
594 if (opt->pre_context || opt->post_context) {
595 if (opt->last_shown == 0) {
596 if (opt->show_hunk_mark) {
597 output_color(opt, "--", 2, opt->color_sep);
598 opt->output(opt, "\n", 1);
600 } else if (lno > opt->last_shown + 1) {
601 output_color(opt, "--", 2, opt->color_sep);
602 opt->output(opt, "\n", 1);
605 opt->last_shown = lno;
607 if (opt->pathname) {
608 output_color(opt, name, strlen(name), opt->color_filename);
609 output_sep(opt, sign);
611 if (opt->linenum) {
612 char buf[32];
613 snprintf(buf, sizeof(buf), "%d", lno);
614 output_color(opt, buf, strlen(buf), opt->color_lineno);
615 output_sep(opt, sign);
617 if (opt->color) {
618 regmatch_t match;
619 enum grep_context ctx = GREP_CONTEXT_BODY;
620 int ch = *eol;
621 int eflags = 0;
623 if (sign == ':')
624 line_color = opt->color_selected;
625 else if (sign == '-')
626 line_color = opt->color_context;
627 else if (sign == '=')
628 line_color = opt->color_function;
629 *eol = '\0';
630 while (next_match(opt, bol, eol, ctx, &match, eflags)) {
631 if (match.rm_so == match.rm_eo)
632 break;
634 output_color(opt, bol, match.rm_so, line_color);
635 output_color(opt, bol + match.rm_so,
636 match.rm_eo - match.rm_so,
637 opt->color_match);
638 bol += match.rm_eo;
639 rest -= match.rm_eo;
640 eflags = REG_NOTBOL;
642 *eol = ch;
644 output_color(opt, bol, rest, line_color);
645 opt->output(opt, "\n", 1);
648 static int match_funcname(struct grep_opt *opt, char *bol, char *eol)
650 xdemitconf_t *xecfg = opt->priv;
651 if (xecfg && xecfg->find_func) {
652 char buf[1];
653 return xecfg->find_func(bol, eol - bol, buf, 1,
654 xecfg->find_func_priv) >= 0;
657 if (bol == eol)
658 return 0;
659 if (isalpha(*bol) || *bol == '_' || *bol == '$')
660 return 1;
661 return 0;
664 static void show_funcname_line(struct grep_opt *opt, const char *name,
665 char *buf, char *bol, unsigned lno)
667 while (bol > buf) {
668 char *eol = --bol;
670 while (bol > buf && bol[-1] != '\n')
671 bol--;
672 lno--;
674 if (lno <= opt->last_shown)
675 break;
677 if (match_funcname(opt, bol, eol)) {
678 show_line(opt, bol, eol, name, lno, '=');
679 break;
684 static void show_pre_context(struct grep_opt *opt, const char *name, char *buf,
685 char *bol, unsigned lno)
687 unsigned cur = lno, from = 1, funcname_lno = 0;
688 int funcname_needed = opt->funcname;
690 if (opt->pre_context < lno)
691 from = lno - opt->pre_context;
692 if (from <= opt->last_shown)
693 from = opt->last_shown + 1;
695 /* Rewind. */
696 while (bol > buf && cur > from) {
697 char *eol = --bol;
699 while (bol > buf && bol[-1] != '\n')
700 bol--;
701 cur--;
702 if (funcname_needed && match_funcname(opt, bol, eol)) {
703 funcname_lno = cur;
704 funcname_needed = 0;
708 /* We need to look even further back to find a function signature. */
709 if (opt->funcname && funcname_needed)
710 show_funcname_line(opt, name, buf, bol, cur);
712 /* Back forward. */
713 while (cur < lno) {
714 char *eol = bol, sign = (cur == funcname_lno) ? '=' : '-';
716 while (*eol != '\n')
717 eol++;
718 show_line(opt, bol, eol, name, cur, sign);
719 bol = eol + 1;
720 cur++;
724 static int should_lookahead(struct grep_opt *opt)
726 struct grep_pat *p;
728 if (opt->extended)
729 return 0; /* punt for too complex stuff */
730 if (opt->invert)
731 return 0;
732 for (p = opt->pattern_list; p; p = p->next) {
733 if (p->token != GREP_PATTERN)
734 return 0; /* punt for "header only" and stuff */
736 return 1;
739 static int look_ahead(struct grep_opt *opt,
740 unsigned long *left_p,
741 unsigned *lno_p,
742 char **bol_p)
744 unsigned lno = *lno_p;
745 char *bol = *bol_p;
746 struct grep_pat *p;
747 char *sp, *last_bol;
748 regoff_t earliest = -1;
750 for (p = opt->pattern_list; p; p = p->next) {
751 int hit;
752 regmatch_t m;
754 if (p->fixed)
755 hit = !fixmatch(p, bol, bol + *left_p, &m);
756 else
757 hit = !regmatch(&p->regexp, bol, bol + *left_p, &m, 0);
758 if (!hit || m.rm_so < 0 || m.rm_eo < 0)
759 continue;
760 if (earliest < 0 || m.rm_so < earliest)
761 earliest = m.rm_so;
764 if (earliest < 0) {
765 *bol_p = bol + *left_p;
766 *left_p = 0;
767 return 1;
769 for (sp = bol + earliest; bol < sp && sp[-1] != '\n'; sp--)
770 ; /* find the beginning of the line */
771 last_bol = sp;
773 for (sp = bol; sp < last_bol; sp++) {
774 if (*sp == '\n')
775 lno++;
777 *left_p -= last_bol - bol;
778 *bol_p = last_bol;
779 *lno_p = lno;
780 return 0;
783 int grep_threads_ok(const struct grep_opt *opt)
785 /* If this condition is true, then we may use the attribute
786 * machinery in grep_buffer_1. The attribute code is not
787 * thread safe, so we disable the use of threads.
789 if (opt->funcname && !opt->unmatch_name_only && !opt->status_only &&
790 !opt->name_only)
791 return 0;
793 return 1;
796 static void std_output(struct grep_opt *opt, const void *buf, size_t size)
798 fwrite(buf, size, 1, stdout);
801 static int grep_buffer_1(struct grep_opt *opt, const char *name,
802 char *buf, unsigned long size, int collect_hits)
804 char *bol = buf;
805 unsigned long left = size;
806 unsigned lno = 1;
807 unsigned last_hit = 0;
808 int binary_match_only = 0;
809 unsigned count = 0;
810 int try_lookahead = 0;
811 enum grep_context ctx = GREP_CONTEXT_HEAD;
812 xdemitconf_t xecfg;
814 if (!opt->output)
815 opt->output = std_output;
817 if (opt->last_shown && (opt->pre_context || opt->post_context) &&
818 opt->output == std_output)
819 opt->show_hunk_mark = 1;
820 opt->last_shown = 0;
822 switch (opt->binary) {
823 case GREP_BINARY_DEFAULT:
824 if (buffer_is_binary(buf, size))
825 binary_match_only = 1;
826 break;
827 case GREP_BINARY_NOMATCH:
828 if (buffer_is_binary(buf, size))
829 return 0; /* Assume unmatch */
830 break;
831 case GREP_BINARY_TEXT:
832 break;
833 default:
834 die("bug: unknown binary handling mode");
837 memset(&xecfg, 0, sizeof(xecfg));
838 if (opt->funcname && !opt->unmatch_name_only && !opt->status_only &&
839 !opt->name_only && !binary_match_only && !collect_hits) {
840 struct userdiff_driver *drv = userdiff_find_by_path(name);
841 if (drv && drv->funcname.pattern) {
842 const struct userdiff_funcname *pe = &drv->funcname;
843 xdiff_set_find_func(&xecfg, pe->pattern, pe->cflags);
844 opt->priv = &xecfg;
847 try_lookahead = should_lookahead(opt);
849 while (left) {
850 char *eol, ch;
851 int hit;
854 * look_ahead() skips quicly to the line that possibly
855 * has the next hit; don't call it if we need to do
856 * something more than just skipping the current line
857 * in response to an unmatch for the current line. E.g.
858 * inside a post-context window, we will show the current
859 * line as a context around the previous hit when it
860 * doesn't hit.
862 if (try_lookahead
863 && !(last_hit
864 && lno <= last_hit + opt->post_context)
865 && look_ahead(opt, &left, &lno, &bol))
866 break;
867 eol = end_of_line(bol, &left);
868 ch = *eol;
869 *eol = 0;
871 if ((ctx == GREP_CONTEXT_HEAD) && (eol == bol))
872 ctx = GREP_CONTEXT_BODY;
874 hit = match_line(opt, bol, eol, ctx, collect_hits);
875 *eol = ch;
877 if (collect_hits)
878 goto next_line;
880 /* "grep -v -e foo -e bla" should list lines
881 * that do not have either, so inversion should
882 * be done outside.
884 if (opt->invert)
885 hit = !hit;
886 if (opt->unmatch_name_only) {
887 if (hit)
888 return 0;
889 goto next_line;
891 if (hit) {
892 count++;
893 if (opt->status_only)
894 return 1;
895 if (opt->name_only) {
896 show_name(opt, name);
897 return 1;
899 if (opt->count)
900 goto next_line;
901 if (binary_match_only) {
902 opt->output(opt, "Binary file ", 12);
903 output_color(opt, name, strlen(name),
904 opt->color_filename);
905 opt->output(opt, " matches\n", 9);
906 return 1;
908 /* Hit at this line. If we haven't shown the
909 * pre-context lines, we would need to show them.
911 if (opt->pre_context)
912 show_pre_context(opt, name, buf, bol, lno);
913 else if (opt->funcname)
914 show_funcname_line(opt, name, buf, bol, lno);
915 show_line(opt, bol, eol, name, lno, ':');
916 last_hit = lno;
918 else if (last_hit &&
919 lno <= last_hit + opt->post_context) {
920 /* If the last hit is within the post context,
921 * we need to show this line.
923 show_line(opt, bol, eol, name, lno, '-');
926 next_line:
927 bol = eol + 1;
928 if (!left)
929 break;
930 left--;
931 lno++;
934 if (collect_hits)
935 return 0;
937 if (opt->status_only)
938 return 0;
939 if (opt->unmatch_name_only) {
940 /* We did not see any hit, so we want to show this */
941 show_name(opt, name);
942 return 1;
945 xdiff_clear_find_func(&xecfg);
946 opt->priv = NULL;
948 /* NEEDSWORK:
949 * The real "grep -c foo *.c" gives many "bar.c:0" lines,
950 * which feels mostly useless but sometimes useful. Maybe
951 * make it another option? For now suppress them.
953 if (opt->count && count) {
954 char buf[32];
955 output_color(opt, name, strlen(name), opt->color_filename);
956 output_sep(opt, ':');
957 snprintf(buf, sizeof(buf), "%u\n", count);
958 opt->output(opt, buf, strlen(buf));
959 return 1;
961 return !!last_hit;
964 static void clr_hit_marker(struct grep_expr *x)
966 /* All-hit markers are meaningful only at the very top level
967 * OR node.
969 while (1) {
970 x->hit = 0;
971 if (x->node != GREP_NODE_OR)
972 return;
973 x->u.binary.left->hit = 0;
974 x = x->u.binary.right;
978 static int chk_hit_marker(struct grep_expr *x)
980 /* Top level nodes have hit markers. See if they all are hits */
981 while (1) {
982 if (x->node != GREP_NODE_OR)
983 return x->hit;
984 if (!x->u.binary.left->hit)
985 return 0;
986 x = x->u.binary.right;
990 int grep_buffer(struct grep_opt *opt, const char *name, char *buf, unsigned long size)
993 * we do not have to do the two-pass grep when we do not check
994 * buffer-wide "all-match".
996 if (!opt->all_match)
997 return grep_buffer_1(opt, name, buf, size, 0);
999 /* Otherwise the toplevel "or" terms hit a bit differently.
1000 * We first clear hit markers from them.
1002 clr_hit_marker(opt->pattern_expression);
1003 grep_buffer_1(opt, name, buf, size, 1);
1005 if (!chk_hit_marker(opt->pattern_expression))
1006 return 0;
1008 return grep_buffer_1(opt, name, buf, size, 0);