Skip to content
This repository

HTTPS clone URL

Subversion checkout URL

You can clone with HTTPS or Subversion.

Download ZIP
tree: 2a9a19e1b1
Fetching contributors…

Octocat-spinner-32-eaf2f5

Cannot retrieve contributors at this time

file 1400 lines (1226 sloc) 31.749 kb
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399
#include "cache.h"
#include "grep.h"
#include "userdiff.h"
#include "xdiff-interface.h"

static struct grep_pat *create_grep_pat(const char *pat, size_t patlen,
const char *origin, int no,
enum grep_pat_token t,
enum grep_header_field field)
{
struct grep_pat *p = xcalloc(1, sizeof(*p));
p->pattern = xmemdupz(pat, patlen);
p->patternlen = patlen;
p->origin = origin;
p->no = no;
p->token = t;
p->field = field;
return p;
}

static void do_append_grep_pat(struct grep_pat ***tail, struct grep_pat *p)
{
**tail = p;
*tail = &p->next;
p->next = NULL;

switch (p->token) {
case GREP_PATTERN: /* atom */
case GREP_PATTERN_HEAD:
case GREP_PATTERN_BODY:
for (;;) {
struct grep_pat *new_pat;
size_t len = 0;
char *cp = p->pattern + p->patternlen, *nl = NULL;
while (++len <= p->patternlen) {
if (*(--cp) == '\n') {
nl = cp;
break;
}
}
if (!nl)
break;
new_pat = create_grep_pat(nl + 1, len - 1, p->origin,
p->no, p->token, p->field);
new_pat->next = p->next;
if (!p->next)
*tail = &new_pat->next;
p->next = new_pat;
*nl = '\0';
p->patternlen -= len;
}
break;
default:
break;
}
}

void append_header_grep_pattern(struct grep_opt *opt,
enum grep_header_field field, const char *pat)
{
struct grep_pat *p = create_grep_pat(pat, strlen(pat), "header", 0,
GREP_PATTERN_HEAD, field);
do_append_grep_pat(&opt->header_tail, p);
}

void append_grep_pattern(struct grep_opt *opt, const char *pat,
const char *origin, int no, enum grep_pat_token t)
{
append_grep_pat(opt, pat, strlen(pat), origin, no, t);
}

void append_grep_pat(struct grep_opt *opt, const char *pat, size_t patlen,
const char *origin, int no, enum grep_pat_token t)
{
struct grep_pat *p = create_grep_pat(pat, patlen, origin, no, t, 0);
do_append_grep_pat(&opt->pattern_tail, p);
}

struct grep_opt *grep_opt_dup(const struct grep_opt *opt)
{
struct grep_pat *pat;
struct grep_opt *ret = xmalloc(sizeof(struct grep_opt));
*ret = *opt;

ret->pattern_list = NULL;
ret->pattern_tail = &ret->pattern_list;

for(pat = opt->pattern_list; pat != NULL; pat = pat->next)
{
if(pat->token == GREP_PATTERN_HEAD)
append_header_grep_pattern(ret, pat->field,
pat->pattern);
else
append_grep_pat(ret, pat->pattern, pat->patternlen,
pat->origin, pat->no, pat->token);
}

return ret;
}

static NORETURN void compile_regexp_failed(const struct grep_pat *p,
const char *error)
{
char where[1024];

if (p->no)
sprintf(where, "In '%s' at %d, ", p->origin, p->no);
else if (p->origin)
sprintf(where, "%s, ", p->origin);
else
where[0] = 0;

die("%s'%s': %s", where, p->pattern, error);
}

#ifdef USE_LIBPCRE
static void compile_pcre_regexp(struct grep_pat *p, const struct grep_opt *opt)
{
const char *error;
int erroffset;
int options = PCRE_MULTILINE;

if (opt->ignore_case)
options |= PCRE_CASELESS;

p->pcre_regexp = pcre_compile(p->pattern, options, &error, &erroffset,
NULL);
if (!p->pcre_regexp)
compile_regexp_failed(p, error);

p->pcre_extra_info = pcre_study(p->pcre_regexp, 0, &error);
if (!p->pcre_extra_info && error)
die("%s", error);
}

static int pcrematch(struct grep_pat *p, const char *line, const char *eol,
regmatch_t *match, int eflags)
{
int ovector[30], ret, flags = 0;

if (eflags & REG_NOTBOL)
flags |= PCRE_NOTBOL;

ret = pcre_exec(p->pcre_regexp, p->pcre_extra_info, line, eol - line,
0, flags, ovector, ARRAY_SIZE(ovector));
if (ret < 0 && ret != PCRE_ERROR_NOMATCH)
die("pcre_exec failed with error code %d", ret);
if (ret > 0) {
ret = 0;
match->rm_so = ovector[0];
match->rm_eo = ovector[1];
}

return ret;
}

static void free_pcre_regexp(struct grep_pat *p)
{
pcre_free(p->pcre_regexp);
pcre_free(p->pcre_extra_info);
}
#else /* !USE_LIBPCRE */
static void compile_pcre_regexp(struct grep_pat *p, const struct grep_opt *opt)
{
die("cannot use Perl-compatible regexes when not compiled with USE_LIBPCRE");
}

static int pcrematch(struct grep_pat *p, const char *line, const char *eol,
regmatch_t *match, int eflags)
{
return 1;
}

static void free_pcre_regexp(struct grep_pat *p)
{
}
#endif /* !USE_LIBPCRE */

static int is_fixed(const char *s, size_t len)
{
size_t i;

/* regcomp cannot accept patterns with NULs so we
* consider any pattern containing a NUL fixed.
*/
if (memchr(s, 0, len))
return 1;

for (i = 0; i < len; i++) {
if (is_regex_special(s[i]))
return 0;
}

return 1;
}

static void compile_regexp(struct grep_pat *p, struct grep_opt *opt)
{
int err;

p->word_regexp = opt->word_regexp;
p->ignore_case = opt->ignore_case;

if (opt->fixed || is_fixed(p->pattern, p->patternlen))
p->fixed = 1;
else
p->fixed = 0;

if (p->fixed) {
if (opt->regflags & REG_ICASE || p->ignore_case)
p->kws = kwsalloc(tolower_trans_tbl);
else
p->kws = kwsalloc(NULL);
kwsincr(p->kws, p->pattern, p->patternlen);
kwsprep(p->kws);
return;
}

if (opt->pcre) {
compile_pcre_regexp(p, opt);
return;
}

err = regcomp(&p->regexp, p->pattern, opt->regflags);
if (err) {
char errbuf[1024];
regerror(err, &p->regexp, errbuf, 1024);
regfree(&p->regexp);
compile_regexp_failed(p, errbuf);
}
}

static struct grep_expr *compile_pattern_or(struct grep_pat **);
static struct grep_expr *compile_pattern_atom(struct grep_pat **list)
{
struct grep_pat *p;
struct grep_expr *x;

p = *list;
if (!p)
return NULL;
switch (p->token) {
case GREP_PATTERN: /* atom */
case GREP_PATTERN_HEAD:
case GREP_PATTERN_BODY:
x = xcalloc(1, sizeof (struct grep_expr));
x->node = GREP_NODE_ATOM;
x->u.atom = p;
*list = p->next;
return x;
case GREP_OPEN_PAREN:
*list = p->next;
x = compile_pattern_or(list);
if (!*list || (*list)->token != GREP_CLOSE_PAREN)
die("unmatched parenthesis");
*list = (*list)->next;
return x;
default:
return NULL;
}
}

static struct grep_expr *compile_pattern_not(struct grep_pat **list)
{
struct grep_pat *p;
struct grep_expr *x;

p = *list;
if (!p)
return NULL;
switch (p->token) {
case GREP_NOT:
if (!p->next)
die("--not not followed by pattern expression");
*list = p->next;
x = xcalloc(1, sizeof (struct grep_expr));
x->node = GREP_NODE_NOT;
x->u.unary = compile_pattern_not(list);
if (!x->u.unary)
die("--not followed by non pattern expression");
return x;
default:
return compile_pattern_atom(list);
}
}

static struct grep_expr *compile_pattern_and(struct grep_pat **list)
{
struct grep_pat *p;
struct grep_expr *x, *y, *z;

x = compile_pattern_not(list);
p = *list;
if (p && p->token == GREP_AND) {
if (!p->next)
die("--and not followed by pattern expression");
*list = p->next;
y = compile_pattern_and(list);
if (!y)
die("--and not followed by pattern expression");
z = xcalloc(1, sizeof (struct grep_expr));
z->node = GREP_NODE_AND;
z->u.binary.left = x;
z->u.binary.right = y;
return z;
}
return x;
}

static struct grep_expr *compile_pattern_or(struct grep_pat **list)
{
struct grep_pat *p;
struct grep_expr *x, *y, *z;

x = compile_pattern_and(list);
p = *list;
if (x && p && p->token != GREP_CLOSE_PAREN) {
y = compile_pattern_or(list);
if (!y)
die("not a pattern expression %s", p->pattern);
z = xcalloc(1, sizeof (struct grep_expr));
z->node = GREP_NODE_OR;
z->u.binary.left = x;
z->u.binary.right = y;
return z;
}
return x;
}

static struct grep_expr *compile_pattern_expr(struct grep_pat **list)
{
return compile_pattern_or(list);
}

static struct grep_expr *grep_true_expr(void)
{
struct grep_expr *z = xcalloc(1, sizeof(*z));
z->node = GREP_NODE_TRUE;
return z;
}

static struct grep_expr *grep_or_expr(struct grep_expr *left, struct grep_expr *right)
{
struct grep_expr *z = xcalloc(1, sizeof(*z));
z->node = GREP_NODE_OR;
z->u.binary.left = left;
z->u.binary.right = right;
return z;
}

static struct grep_expr *prep_header_patterns(struct grep_opt *opt)
{
struct grep_pat *p;
struct grep_expr *header_expr;
struct grep_expr *(header_group[GREP_HEADER_FIELD_MAX]);
enum grep_header_field fld;

if (!opt->header_list)
return NULL;

for (p = opt->header_list; p; p = p->next) {
if (p->token != GREP_PATTERN_HEAD)
die("bug: a non-header pattern in grep header list.");
if (p->field < 0 || GREP_HEADER_FIELD_MAX <= p->field)
die("bug: unknown header field %d", p->field);
compile_regexp(p, opt);
}

for (fld = 0; fld < GREP_HEADER_FIELD_MAX; fld++)
header_group[fld] = NULL;

for (p = opt->header_list; p; p = p->next) {
struct grep_expr *h;
struct grep_pat *pp = p;

h = compile_pattern_atom(&pp);
if (!h || pp != p->next)
die("bug: malformed header expr");
if (!header_group[p->field]) {
header_group[p->field] = h;
continue;
}
header_group[p->field] = grep_or_expr(h, header_group[p->field]);
}

header_expr = NULL;

for (fld = 0; fld < GREP_HEADER_FIELD_MAX; fld++) {
if (!header_group[fld])
continue;
if (!header_expr)
header_expr = grep_true_expr();
header_expr = grep_or_expr(header_group[fld], header_expr);
}
return header_expr;
}

void compile_grep_patterns(struct grep_opt *opt)
{
struct grep_pat *p;
struct grep_expr *header_expr = prep_header_patterns(opt);

for (p = opt->pattern_list; p; p = p->next) {
switch (p->token) {
case GREP_PATTERN: /* atom */
case GREP_PATTERN_HEAD:
case GREP_PATTERN_BODY:
compile_regexp(p, opt);
break;
default:
opt->extended = 1;
break;
}
}

if (opt->all_match || header_expr)
opt->extended = 1;
else if (!opt->extended)
return;

p = opt->pattern_list;
if (p)
opt->pattern_expression = compile_pattern_expr(&p);
if (p)
die("incomplete pattern expression: %s", p->pattern);

if (!header_expr)
return;

if (!opt->pattern_expression)
opt->pattern_expression = header_expr;
else
opt->pattern_expression = grep_or_expr(opt->pattern_expression,
header_expr);
opt->all_match = 1;
}

static void free_pattern_expr(struct grep_expr *x)
{
switch (x->node) {
case GREP_NODE_TRUE:
case GREP_NODE_ATOM:
break;
case GREP_NODE_NOT:
free_pattern_expr(x->u.unary);
break;
case GREP_NODE_AND:
case GREP_NODE_OR:
free_pattern_expr(x->u.binary.left);
free_pattern_expr(x->u.binary.right);
break;
}
free(x);
}

void free_grep_patterns(struct grep_opt *opt)
{
struct grep_pat *p, *n;

for (p = opt->pattern_list; p; p = n) {
n = p->next;
switch (p->token) {
case GREP_PATTERN: /* atom */
case GREP_PATTERN_HEAD:
case GREP_PATTERN_BODY:
if (p->kws)
kwsfree(p->kws);
else if (p->pcre_regexp)
free_pcre_regexp(p);
else
regfree(&p->regexp);
free(p->pattern);
break;
default:
break;
}
free(p);
}

if (!opt->extended)
return;
free_pattern_expr(opt->pattern_expression);
}

static char *end_of_line(char *cp, unsigned long *left)
{
unsigned long l = *left;
while (l && *cp != '\n') {
l--;
cp++;
}
*left = l;
return cp;
}

static int word_char(char ch)
{
return isalnum(ch) || ch == '_';
}

static void output_color(struct grep_opt *opt, const void *data, size_t size,
const char *color)
{
if (want_color(opt->color) && color && color[0]) {
opt->output(opt, color, strlen(color));
opt->output(opt, data, size);
opt->output(opt, GIT_COLOR_RESET, strlen(GIT_COLOR_RESET));
} else
opt->output(opt, data, size);
}

static void output_sep(struct grep_opt *opt, char sign)
{
if (opt->null_following_name)
opt->output(opt, "\0", 1);
else
output_color(opt, &sign, 1, opt->color_sep);
}

static void show_name(struct grep_opt *opt, const char *name)
{
output_color(opt, name, strlen(name), opt->color_filename);
opt->output(opt, opt->null_following_name ? "\0" : "\n", 1);
}

static int fixmatch(struct grep_pat *p, char *line, char *eol,
regmatch_t *match)
{
struct kwsmatch kwsm;
size_t offset = kwsexec(p->kws, line, eol - line, &kwsm);
if (offset == -1) {
match->rm_so = match->rm_eo = -1;
return REG_NOMATCH;
} else {
match->rm_so = offset;
match->rm_eo = match->rm_so + kwsm.size[0];
return 0;
}
}

static int regmatch(const regex_t *preg, char *line, char *eol,
regmatch_t *match, int eflags)
{
#ifdef REG_STARTEND
match->rm_so = 0;
match->rm_eo = eol - line;
eflags |= REG_STARTEND;
#endif
return regexec(preg, line, 1, match, eflags);
}

static int patmatch(struct grep_pat *p, char *line, char *eol,
regmatch_t *match, int eflags)
{
int hit;

if (p->fixed)
hit = !fixmatch(p, line, eol, match);
else if (p->pcre_regexp)
hit = !pcrematch(p, line, eol, match, eflags);
else
hit = !regmatch(&p->regexp, line, eol, match, eflags);

return hit;
}

static int strip_timestamp(char *bol, char **eol_p)
{
char *eol = *eol_p;
int ch;

while (bol < --eol) {
if (*eol != '>')
continue;
*eol_p = ++eol;
ch = *eol;
*eol = '\0';
return ch;
}
return 0;
}

static struct {
const char *field;
size_t len;
} header_field[] = {
{ "author ", 7 },
{ "committer ", 10 },
};

static int match_one_pattern(struct grep_pat *p, char *bol, char *eol,
enum grep_context ctx,
regmatch_t *pmatch, int eflags)
{
int hit = 0;
int saved_ch = 0;
const char *start = bol;

if ((p->token != GREP_PATTERN) &&
((p->token == GREP_PATTERN_HEAD) != (ctx == GREP_CONTEXT_HEAD)))
return 0;

if (p->token == GREP_PATTERN_HEAD) {
const char *field;
size_t len;
assert(p->field < ARRAY_SIZE(header_field));
field = header_field[p->field].field;
len = header_field[p->field].len;
if (strncmp(bol, field, len))
return 0;
bol += len;
saved_ch = strip_timestamp(bol, &eol);
}

 again:
hit = patmatch(p, bol, eol, pmatch, eflags);

if (hit && p->word_regexp) {
if ((pmatch[0].rm_so < 0) ||
(eol - bol) < pmatch[0].rm_so ||
(pmatch[0].rm_eo < 0) ||
(eol - bol) < pmatch[0].rm_eo)
die("regexp returned nonsense");

/* Match beginning must be either beginning of the
* line, or at word boundary (i.e. the last char must
* not be a word char). Similarly, match end must be
* either end of the line, or at word boundary
* (i.e. the next char must not be a word char).
*/
if ( ((pmatch[0].rm_so == 0) ||
!word_char(bol[pmatch[0].rm_so-1])) &&
((pmatch[0].rm_eo == (eol-bol)) ||
!word_char(bol[pmatch[0].rm_eo])) )
;
else
hit = 0;

/* Words consist of at least one character. */
if (pmatch->rm_so == pmatch->rm_eo)
hit = 0;

if (!hit && pmatch[0].rm_so + bol + 1 < eol) {
/* There could be more than one match on the
* line, and the first match might not be
* strict word match. But later ones could be!
* Forward to the next possible start, i.e. the
* next position following a non-word char.
*/
bol = pmatch[0].rm_so + bol + 1;
while (word_char(bol[-1]) && bol < eol)
bol++;
eflags |= REG_NOTBOL;
if (bol < eol)
goto again;
}
}
if (p->token == GREP_PATTERN_HEAD && saved_ch)
*eol = saved_ch;
if (hit) {
pmatch[0].rm_so += bol - start;
pmatch[0].rm_eo += bol - start;
}
return hit;
}

static int match_expr_eval(struct grep_expr *x, char *bol, char *eol,
enum grep_context ctx, int collect_hits)
{
int h = 0;
regmatch_t match;

if (!x)
die("Not a valid grep expression");
switch (x->node) {
case GREP_NODE_TRUE:
h = 1;
break;
case GREP_NODE_ATOM:
h = match_one_pattern(x->u.atom, bol, eol, ctx, &match, 0);
break;
case GREP_NODE_NOT:
h = !match_expr_eval(x->u.unary, bol, eol, ctx, 0);
break;
case GREP_NODE_AND:
if (!match_expr_eval(x->u.binary.left, bol, eol, ctx, 0))
return 0;
h = match_expr_eval(x->u.binary.right, bol, eol, ctx, 0);
break;
case GREP_NODE_OR:
if (!collect_hits)
return (match_expr_eval(x->u.binary.left,
bol, eol, ctx, 0) ||
match_expr_eval(x->u.binary.right,
bol, eol, ctx, 0));
h = match_expr_eval(x->u.binary.left, bol, eol, ctx, 0);
x->u.binary.left->hit |= h;
h |= match_expr_eval(x->u.binary.right, bol, eol, ctx, 1);
break;
default:
die("Unexpected node type (internal error) %d", x->node);
}
if (collect_hits)
x->hit |= h;
return h;
}

static int match_expr(struct grep_opt *opt, char *bol, char *eol,
enum grep_context ctx, int collect_hits)
{
struct grep_expr *x = opt->pattern_expression;
return match_expr_eval(x, bol, eol, ctx, collect_hits);
}

static int match_line(struct grep_opt *opt, char *bol, char *eol,
enum grep_context ctx, int collect_hits)
{
struct grep_pat *p;
regmatch_t match;

if (opt->extended)
return match_expr(opt, bol, eol, ctx, collect_hits);

/* we do not call with collect_hits without being extended */
for (p = opt->pattern_list; p; p = p->next) {
if (match_one_pattern(p, bol, eol, ctx, &match, 0))
return 1;
}
return 0;
}

static int match_next_pattern(struct grep_pat *p, char *bol, char *eol,
enum grep_context ctx,
regmatch_t *pmatch, int eflags)
{
regmatch_t match;

if (!match_one_pattern(p, bol, eol, ctx, &match, eflags))
return 0;
if (match.rm_so < 0 || match.rm_eo < 0)
return 0;
if (pmatch->rm_so >= 0 && pmatch->rm_eo >= 0) {
if (match.rm_so > pmatch->rm_so)
return 1;
if (match.rm_so == pmatch->rm_so && match.rm_eo < pmatch->rm_eo)
return 1;
}
pmatch->rm_so = match.rm_so;
pmatch->rm_eo = match.rm_eo;
return 1;
}

static int next_match(struct grep_opt *opt, char *bol, char *eol,
enum grep_context ctx, regmatch_t *pmatch, int eflags)
{
struct grep_pat *p;
int hit = 0;

pmatch->rm_so = pmatch->rm_eo = -1;
if (bol < eol) {
for (p = opt->pattern_list; p; p = p->next) {
switch (p->token) {
case GREP_PATTERN: /* atom */
case GREP_PATTERN_HEAD:
case GREP_PATTERN_BODY:
hit |= match_next_pattern(p, bol, eol, ctx,
pmatch, eflags);
break;
default:
break;
}
}
}
return hit;
}

static void show_line(struct grep_opt *opt, char *bol, char *eol,
const char *name, unsigned lno, char sign)
{
int rest = eol - bol;
char *line_color = NULL;

if (opt->file_break && opt->last_shown == 0) {
if (opt->show_hunk_mark)
opt->output(opt, "\n", 1);
} else if (opt->pre_context || opt->post_context || opt->funcbody) {
if (opt->last_shown == 0) {
if (opt->show_hunk_mark) {
output_color(opt, "--", 2, opt->color_sep);
opt->output(opt, "\n", 1);
}
} else if (lno > opt->last_shown + 1) {
output_color(opt, "--", 2, opt->color_sep);
opt->output(opt, "\n", 1);
}
}
if (opt->heading && opt->last_shown == 0) {
output_color(opt, name, strlen(name), opt->color_filename);
opt->output(opt, "\n", 1);
}
opt->last_shown = lno;

if (!opt->heading && opt->pathname) {
output_color(opt, name, strlen(name), opt->color_filename);
output_sep(opt, sign);
}
if (opt->linenum) {
char buf[32];
snprintf(buf, sizeof(buf), "%d", lno);
output_color(opt, buf, strlen(buf), opt->color_lineno);
output_sep(opt, sign);
}
if (opt->color) {
regmatch_t match;
enum grep_context ctx = GREP_CONTEXT_BODY;
int ch = *eol;
int eflags = 0;

if (sign == ':')
line_color = opt->color_selected;
else if (sign == '-')
line_color = opt->color_context;
else if (sign == '=')
line_color = opt->color_function;
*eol = '\0';
while (next_match(opt, bol, eol, ctx, &match, eflags)) {
if (match.rm_so == match.rm_eo)
break;

output_color(opt, bol, match.rm_so, line_color);
output_color(opt, bol + match.rm_so,
match.rm_eo - match.rm_so,
opt->color_match);
bol += match.rm_eo;
rest -= match.rm_eo;
eflags = REG_NOTBOL;
}
*eol = ch;
}
output_color(opt, bol, rest, line_color);
opt->output(opt, "\n", 1);
}

#ifndef NO_PTHREADS
int grep_use_locks;

/*
* This lock protects access to the gitattributes machinery, which is
* not thread-safe.
*/
pthread_mutex_t grep_attr_mutex;

static inline void grep_attr_lock(void)
{
if (grep_use_locks)
pthread_mutex_lock(&grep_attr_mutex);
}

static inline void grep_attr_unlock(void)
{
if (grep_use_locks)
pthread_mutex_unlock(&grep_attr_mutex);
}

/*
* Same as git_attr_mutex, but protecting the thread-unsafe object db access.
*/
pthread_mutex_t grep_read_mutex;

#else
#define grep_attr_lock()
#define grep_attr_unlock()
#endif

static int match_funcname(struct grep_opt *opt, struct grep_source *gs, char *bol, char *eol)
{
xdemitconf_t *xecfg = opt->priv;
if (xecfg && !xecfg->find_func) {
grep_source_load_driver(gs);
if (gs->driver->funcname.pattern) {
const struct userdiff_funcname *pe = &gs->driver->funcname;
xdiff_set_find_func(xecfg, pe->pattern, pe->cflags);
} else {
xecfg = opt->priv = NULL;
}
}

if (xecfg) {
char buf[1];
return xecfg->find_func(bol, eol - bol, buf, 1,
xecfg->find_func_priv) >= 0;
}

if (bol == eol)
return 0;
if (isalpha(*bol) || *bol == '_' || *bol == '$')
return 1;
return 0;
}

static void show_funcname_line(struct grep_opt *opt, struct grep_source *gs,
char *bol, unsigned lno)
{
while (bol > gs->buf) {
char *eol = --bol;

while (bol > gs->buf && bol[-1] != '\n')
bol--;
lno--;

if (lno <= opt->last_shown)
break;

if (match_funcname(opt, gs, bol, eol)) {
show_line(opt, bol, eol, gs->name, lno, '=');
break;
}
}
}

static void show_pre_context(struct grep_opt *opt, struct grep_source *gs,
char *bol, char *end, unsigned lno)
{
unsigned cur = lno, from = 1, funcname_lno = 0;
int funcname_needed = !!opt->funcname;

if (opt->funcbody && !match_funcname(opt, gs, bol, end))
funcname_needed = 2;

if (opt->pre_context < lno)
from = lno - opt->pre_context;
if (from <= opt->last_shown)
from = opt->last_shown + 1;

/* Rewind. */
while (bol > gs->buf &&
cur > (funcname_needed == 2 ? opt->last_shown + 1 : from)) {
char *eol = --bol;

while (bol > gs->buf && bol[-1] != '\n')
bol--;
cur--;
if (funcname_needed && match_funcname(opt, gs, bol, eol)) {
funcname_lno = cur;
funcname_needed = 0;
}
}

/* We need to look even further back to find a function signature. */
if (opt->funcname && funcname_needed)
show_funcname_line(opt, gs, bol, cur);

/* Back forward. */
while (cur < lno) {
char *eol = bol, sign = (cur == funcname_lno) ? '=' : '-';

while (*eol != '\n')
eol++;
show_line(opt, bol, eol, gs->name, cur, sign);
bol = eol + 1;
cur++;
}
}

static int should_lookahead(struct grep_opt *opt)
{
struct grep_pat *p;

if (opt->extended)
return 0; /* punt for too complex stuff */
if (opt->invert)
return 0;
for (p = opt->pattern_list; p; p = p->next) {
if (p->token != GREP_PATTERN)
return 0; /* punt for "header only" and stuff */
}
return 1;
}

static int look_ahead(struct grep_opt *opt,
unsigned long *left_p,
unsigned *lno_p,
char **bol_p)
{
unsigned lno = *lno_p;
char *bol = *bol_p;
struct grep_pat *p;
char *sp, *last_bol;
regoff_t earliest = -1;

for (p = opt->pattern_list; p; p = p->next) {
int hit;
regmatch_t m;

hit = patmatch(p, bol, bol + *left_p, &m, 0);
if (!hit || m.rm_so < 0 || m.rm_eo < 0)
continue;
if (earliest < 0 || m.rm_so < earliest)
earliest = m.rm_so;
}

if (earliest < 0) {
*bol_p = bol + *left_p;
*left_p = 0;
return 1;
}
for (sp = bol + earliest; bol < sp && sp[-1] != '\n'; sp--)
; /* find the beginning of the line */
last_bol = sp;

for (sp = bol; sp < last_bol; sp++) {
if (*sp == '\n')
lno++;
}
*left_p -= last_bol - bol;
*bol_p = last_bol;
*lno_p = lno;
return 0;
}

static void std_output(struct grep_opt *opt, const void *buf, size_t size)
{
fwrite(buf, size, 1, stdout);
}

static int grep_source_1(struct grep_opt *opt, struct grep_source *gs, int collect_hits)
{
char *bol;
unsigned long left;
unsigned lno = 1;
unsigned last_hit = 0;
int binary_match_only = 0;
unsigned count = 0;
int try_lookahead = 0;
int show_function = 0;
enum grep_context ctx = GREP_CONTEXT_HEAD;
xdemitconf_t xecfg;

if (!opt->output)
opt->output = std_output;

if (opt->pre_context || opt->post_context || opt->file_break ||
opt->funcbody) {
/* Show hunk marks, except for the first file. */
if (opt->last_shown)
opt->show_hunk_mark = 1;
/*
* If we're using threads then we can't easily identify
* the first file. Always put hunk marks in that case
* and skip the very first one later in work_done().
*/
if (opt->output != std_output)
opt->show_hunk_mark = 1;
}
opt->last_shown = 0;

switch (opt->binary) {
case GREP_BINARY_DEFAULT:
if (grep_source_is_binary(gs))
binary_match_only = 1;
break;
case GREP_BINARY_NOMATCH:
if (grep_source_is_binary(gs))
return 0; /* Assume unmatch */
break;
case GREP_BINARY_TEXT:
break;
default:
die("bug: unknown binary handling mode");
}

memset(&xecfg, 0, sizeof(xecfg));
opt->priv = &xecfg;

try_lookahead = should_lookahead(opt);

if (grep_source_load(gs) < 0)
return 0;

bol = gs->buf;
left = gs->size;
while (left) {
char *eol, ch;
int hit;

/*
* look_ahead() skips quickly to the line that possibly
* has the next hit; don't call it if we need to do
* something more than just skipping the current line
* in response to an unmatch for the current line. E.g.
* inside a post-context window, we will show the current
* line as a context around the previous hit when it
* doesn't hit.
*/
if (try_lookahead
&& !(last_hit
&& (show_function ||
lno <= last_hit + opt->post_context))
&& look_ahead(opt, &left, &lno, &bol))
break;
eol = end_of_line(bol, &left);
ch = *eol;
*eol = 0;

if ((ctx == GREP_CONTEXT_HEAD) && (eol == bol))
ctx = GREP_CONTEXT_BODY;

hit = match_line(opt, bol, eol, ctx, collect_hits);
*eol = ch;

if (collect_hits)
goto next_line;

/* "grep -v -e foo -e bla" should list lines
* that do not have either, so inversion should
* be done outside.
*/
if (opt->invert)
hit = !hit;
if (opt->unmatch_name_only) {
if (hit)
return 0;
goto next_line;
}
if (hit) {
count++;
if (opt->status_only)
return 1;
if (opt->name_only) {
show_name(opt, gs->name);
return 1;
}
if (opt->count)
goto next_line;
if (binary_match_only) {
opt->output(opt, "Binary file ", 12);
output_color(opt, gs->name, strlen(gs->name),
opt->color_filename);
opt->output(opt, " matches\n", 9);
return 1;
}
/* Hit at this line. If we haven't shown the
* pre-context lines, we would need to show them.
*/
if (opt->pre_context || opt->funcbody)
show_pre_context(opt, gs, bol, eol, lno);
else if (opt->funcname)
show_funcname_line(opt, gs, bol, lno);
show_line(opt, bol, eol, gs->name, lno, ':');
last_hit = lno;
if (opt->funcbody)
show_function = 1;
goto next_line;
}
if (show_function && match_funcname(opt, gs, bol, eol))
show_function = 0;
if (show_function ||
(last_hit && lno <= last_hit + opt->post_context)) {
/* If the last hit is within the post context,
* we need to show this line.
*/
show_line(opt, bol, eol, gs->name, lno, '-');
}

next_line:
bol = eol + 1;
if (!left)
break;
left--;
lno++;
}

if (collect_hits)
return 0;

if (opt->status_only)
return 0;
if (opt->unmatch_name_only) {
/* We did not see any hit, so we want to show this */
show_name(opt, gs->name);
return 1;
}

xdiff_clear_find_func(&xecfg);
opt->priv = NULL;

/* NEEDSWORK:
* The real "grep -c foo *.c" gives many "bar.c:0" lines,
* which feels mostly useless but sometimes useful. Maybe
* make it another option? For now suppress them.
*/
if (opt->count && count) {
char buf[32];
output_color(opt, gs->name, strlen(gs->name), opt->color_filename);
output_sep(opt, ':');
snprintf(buf, sizeof(buf), "%u\n", count);
opt->output(opt, buf, strlen(buf));
return 1;
}
return !!last_hit;
}

static void clr_hit_marker(struct grep_expr *x)
{
/* All-hit markers are meaningful only at the very top level
* OR node.
*/
while (1) {
x->hit = 0;
if (x->node != GREP_NODE_OR)
return;
x->u.binary.left->hit = 0;
x = x->u.binary.right;
}
}

static int chk_hit_marker(struct grep_expr *x)
{
/* Top level nodes have hit markers. See if they all are hits */
while (1) {
if (x->node != GREP_NODE_OR)
return x->hit;
if (!x->u.binary.left->hit)
return 0;
x = x->u.binary.right;
}
}

int grep_source(struct grep_opt *opt, struct grep_source *gs)
{
/*
* we do not have to do the two-pass grep when we do not check
* buffer-wide "all-match".
*/
if (!opt->all_match)
return grep_source_1(opt, gs, 0);

/* Otherwise the toplevel "or" terms hit a bit differently.
* We first clear hit markers from them.
*/
clr_hit_marker(opt->pattern_expression);
grep_source_1(opt, gs, 1);

if (!chk_hit_marker(opt->pattern_expression))
return 0;

return grep_source_1(opt, gs, 0);
}

int grep_buffer(struct grep_opt *opt, char *buf, unsigned long size)
{
struct grep_source gs;
int r;

grep_source_init(&gs, GREP_SOURCE_BUF, NULL, NULL);
gs.buf = buf;
gs.size = size;

r = grep_source(opt, &gs);

grep_source_clear(&gs);
return r;
}

void grep_source_init(struct grep_source *gs, enum grep_source_type type,
const char *name, const void *identifier)
{
gs->type = type;
gs->name = name ? xstrdup(name) : NULL;
gs->buf = NULL;
gs->size = 0;
gs->driver = NULL;

switch (type) {
case GREP_SOURCE_FILE:
gs->identifier = xstrdup(identifier);
break;
case GREP_SOURCE_SHA1:
gs->identifier = xmalloc(20);
memcpy(gs->identifier, identifier, 20);
break;
case GREP_SOURCE_BUF:
gs->identifier = NULL;
}
}

void grep_source_clear(struct grep_source *gs)
{
free(gs->name);
gs->name = NULL;
free(gs->identifier);
gs->identifier = NULL;
grep_source_clear_data(gs);
}

void grep_source_clear_data(struct grep_source *gs)
{
switch (gs->type) {
case GREP_SOURCE_FILE:
case GREP_SOURCE_SHA1:
free(gs->buf);
gs->buf = NULL;
gs->size = 0;
break;
case GREP_SOURCE_BUF:
/* leave user-provided buf intact */
break;
}
}

static int grep_source_load_sha1(struct grep_source *gs)
{
enum object_type type;

grep_read_lock();
gs->buf = read_sha1_file(gs->identifier, &type, &gs->size);
grep_read_unlock();

if (!gs->buf)
return error(_("'%s': unable to read %s"),
gs->name,
sha1_to_hex(gs->identifier));
return 0;
}

static int grep_source_load_file(struct grep_source *gs)
{
const char *filename = gs->identifier;
struct stat st;
char *data;
size_t size;
int i;

if (lstat(filename, &st) < 0) {
err_ret:
if (errno != ENOENT)
error(_("'%s': %s"), filename, strerror(errno));
return -1;
}
if (!S_ISREG(st.st_mode))
return -1;
size = xsize_t(st.st_size);
i = open(filename, O_RDONLY);
if (i < 0)
goto err_ret;
data = xmalloc(size + 1);
if (st.st_size != read_in_full(i, data, size)) {
error(_("'%s': short read %s"), filename, strerror(errno));
close(i);
free(data);
return -1;
}
close(i);
data[size] = 0;

gs->buf = data;
gs->size = size;
return 0;
}

int grep_source_load(struct grep_source *gs)
{
if (gs->buf)
return 0;

switch (gs->type) {
case GREP_SOURCE_FILE:
return grep_source_load_file(gs);
case GREP_SOURCE_SHA1:
return grep_source_load_sha1(gs);
case GREP_SOURCE_BUF:
return gs->buf ? 0 : -1;
}
die("BUG: invalid grep_source type");
}

void grep_source_load_driver(struct grep_source *gs)
{
if (gs->driver)
return;

grep_attr_lock();
gs->driver = userdiff_find_by_path(gs->name);
if (!gs->driver)
gs->driver = userdiff_find_by_name("default");
grep_attr_unlock();
}

int grep_source_is_binary(struct grep_source *gs)
{
grep_source_load_driver(gs);
if (gs->driver->binary != -1)
return gs->driver->binary;

if (!grep_source_load(gs))
return buffer_is_binary(gs->buf, gs->size);

return 0;
}
Something went wrong with that request. Please try again.