grep.c

   1 #include "cache.h"
   2 #include "config.h"
   3 #include "grep.h"
   4 #include "userdiff.h"
   5 #include "xdiff-interface.h"
   6 #include "diff.h"
   7 #include "diffcore.h"
   8 #include "commit.h"
   9 #include "quote.h"
  10
  11 static int grep_source_load(struct grep_source *gs);
  12 static int grep_source_is_binary(struct grep_source *gs);
  13
  14 static struct grep_opt grep_defaults;
  15
  16 static void std_output(struct grep_opt *opt, const void *buf, size_t size)
  17 {
  18         fwrite(buf, size, 1, stdout);
  19 }
  20
  21 /*
  22  * Initialize the grep_defaults template with hardcoded defaults.
  23  * We could let the compiler do this, but without C99 initializers
  24  * the code gets unwieldy and unreadable, so...
  25  */
  26 void init_grep_defaults(void)
  27 {
  28         struct grep_opt *opt = &grep_defaults;
  29         static int run_once;
  30
  31         if (run_once)
  32                 return;
  33         run_once++;
  34
  35         memset(opt, 0, sizeof(*opt));
  36         opt->relative = 1;
  37         opt->pathname = 1;
  38         opt->max_depth = -1;
  39         opt->pattern_type_option = GREP_PATTERN_TYPE_UNSPECIFIED;
  40         color_set(opt->color_context, "");
  41         color_set(opt->color_filename, "");
  42         color_set(opt->color_function, "");
  43         color_set(opt->color_lineno, "");
  44         color_set(opt->color_match_context, GIT_COLOR_BOLD_RED);
  45         color_set(opt->color_match_selected, GIT_COLOR_BOLD_RED);
  46         color_set(opt->color_selected, "");
  47         color_set(opt->color_sep, GIT_COLOR_CYAN);
  48         opt->color = -1;
  49         opt->output = std_output;
  50 }
  51
  52 static int parse_pattern_type_arg(const char *opt, const char *arg)
  53 {
  54         if (!strcmp(arg, "default"))
  55                 return GREP_PATTERN_TYPE_UNSPECIFIED;
  56         else if (!strcmp(arg, "basic"))
  57                 return GREP_PATTERN_TYPE_BRE;
  58         else if (!strcmp(arg, "extended"))
  59                 return GREP_PATTERN_TYPE_ERE;
  60         else if (!strcmp(arg, "fixed"))
  61                 return GREP_PATTERN_TYPE_FIXED;
  62         else if (!strcmp(arg, "perl"))
  63                 return GREP_PATTERN_TYPE_PCRE;
  64         die("bad %s argument: %s", opt, arg);
  65 }
  66
  67 /*
  68  * Read the configuration file once and store it in
  69  * the grep_defaults template.
  70  */
  71 int grep_config(const char *var, const char *value, void *cb)
  72 {
  73         struct grep_opt *opt = &grep_defaults;
  74         char *color = NULL;
  75
  76         if (userdiff_config(var, value) < 0)
  77                 return -1;
  78
  79         if (!strcmp(var, "grep.extendedregexp")) {
  80                 opt->extended_regexp_option = git_config_bool(var, value);
  81                 return 0;
  82         }
  83
  84         if (!strcmp(var, "grep.patterntype")) {
  85                 opt->pattern_type_option = parse_pattern_type_arg(var, value);
  86                 return 0;
  87         }
  88
  89         if (!strcmp(var, "grep.linenumber")) {
  90                 opt->linenum = git_config_bool(var, value);
  91                 return 0;
  92         }
  93
  94         if (!strcmp(var, "grep.fullname")) {
  95                 opt->relative = !git_config_bool(var, value);
  96                 return 0;
  97         }
  98
  99         if (!strcmp(var, "color.grep"))
 100                 opt->color = git_config_colorbool(var, value);
 101         else if (!strcmp(var, "color.grep.context"))
 102                 color = opt->color_context;
 103         else if (!strcmp(var, "color.grep.filename"))
 104                 color = opt->color_filename;
 105         else if (!strcmp(var, "color.grep.function"))
 106                 color = opt->color_function;
 107         else if (!strcmp(var, "color.grep.linenumber"))
 108                 color = opt->color_lineno;
 109         else if (!strcmp(var, "color.grep.matchcontext"))
 110                 color = opt->color_match_context;
 111         else if (!strcmp(var, "color.grep.matchselected"))
 112                 color = opt->color_match_selected;
 113         else if (!strcmp(var, "color.grep.selected"))
 114                 color = opt->color_selected;
 115         else if (!strcmp(var, "color.grep.separator"))
 116                 color = opt->color_sep;
 117         else if (!strcmp(var, "color.grep.match")) {
 118                 int rc = 0;
 119                 if (!value)
 120                         return config_error_nonbool(var);
 121                 rc |= color_parse(value, opt->color_match_context);
 122                 rc |= color_parse(value, opt->color_match_selected);
 123                 return rc;
 124         }
 125
 126         if (color) {
 127                 if (!value)
 128                         return config_error_nonbool(var);
 129                 return color_parse(value, color);
 130         }
 131         return 0;
 132 }
 133
 134 /*
 135  * Initialize one instance of grep_opt and copy the
 136  * default values from the template we read the configuration
 137  * information in an earlier call to git_config(grep_config).
 138  */
 139 void grep_init(struct grep_opt *opt, const char *prefix)
 140 {
 141         struct grep_opt *def = &grep_defaults;
 142
 143         memset(opt, 0, sizeof(*opt));
 144         opt->prefix = prefix;
 145         opt->prefix_length = (prefix && *prefix) ? strlen(prefix) : 0;
 146         opt->pattern_tail = &opt->pattern_list;
 147         opt->header_tail = &opt->header_list;
 148
 149         opt->color = def->color;
 150         opt->extended_regexp_option = def->extended_regexp_option;
 151         opt->pattern_type_option = def->pattern_type_option;
 152         opt->linenum = def->linenum;
 153         opt->max_depth = def->max_depth;
 154         opt->pathname = def->pathname;
 155         opt->relative = def->relative;
 156         opt->output = def->output;
 157
 158         color_set(opt->color_context, def->color_context);
 159         color_set(opt->color_filename, def->color_filename);
 160         color_set(opt->color_function, def->color_function);
 161         color_set(opt->color_lineno, def->color_lineno);
 162         color_set(opt->color_match_context, def->color_match_context);
 163         color_set(opt->color_match_selected, def->color_match_selected);
 164         color_set(opt->color_selected, def->color_selected);
 165         color_set(opt->color_sep, def->color_sep);
 166 }
 167
 168 static void grep_set_pattern_type_option(enum grep_pattern_type pattern_type, struct grep_opt *opt)
 169 {
 170         /*
 171          * When committing to the pattern type by setting the relevant
 172          * fields in grep_opt it's generally not necessary to zero out
 173          * the fields we're not choosing, since they won't have been
 174          * set by anything. The extended_regexp_option field is the
 175          * only exception to this.
 176          *
 177          * This is because in the process of parsing grep.patternType
 178          * & grep.extendedRegexp we set opt->pattern_type_option and
 179          * opt->extended_regexp_option, respectively. We then
 180          * internally use opt->extended_regexp_option to see if we're
 181          * compiling an ERE. It must be unset if that's not actually
 182          * the case.
 183          */
 184         if (pattern_type != GREP_PATTERN_TYPE_ERE &&
 185             opt->extended_regexp_option)
 186                 opt->extended_regexp_option = 0;
 187
 188         switch (pattern_type) {
 189         case GREP_PATTERN_TYPE_UNSPECIFIED:
 190                 /* fall through */
 191
 192         case GREP_PATTERN_TYPE_BRE:
 193                 break;
 194
 195         case GREP_PATTERN_TYPE_ERE:
 196                 opt->extended_regexp_option = 1;
 197                 break;
 198
 199         case GREP_PATTERN_TYPE_FIXED:
 200                 opt->fixed = 1;
 201                 break;
 202
 203         case GREP_PATTERN_TYPE_PCRE:
 204 #ifdef USE_LIBPCRE2
 205                 opt->pcre2 = 1;
 206 #else
 207                 /*
 208                  * It's important that pcre1 always be assigned to
 209                  * even when there's no USE_LIBPCRE* defined. We still
 210                  * call the PCRE stub function, it just dies with
 211                  * "cannot use Perl-compatible regexes[...]".
 212                  */
 213                 opt->pcre1 = 1;
 214 #endif
 215                 break;
 216         }
 217 }
 218
 219 void grep_commit_pattern_type(enum grep_pattern_type pattern_type, struct grep_opt *opt)
 220 {
 221         if (pattern_type != GREP_PATTERN_TYPE_UNSPECIFIED)
 222                 grep_set_pattern_type_option(pattern_type, opt);
 223         else if (opt->pattern_type_option != GREP_PATTERN_TYPE_UNSPECIFIED)
 224                 grep_set_pattern_type_option(opt->pattern_type_option, opt);
 225         else if (opt->extended_regexp_option)
 226                 /*
 227                  * This branch *must* happen after setting from the
 228                  * opt->pattern_type_option above, we don't want
 229                  * grep.extendedRegexp to override grep.patternType!
 230                  */
 231                 grep_set_pattern_type_option(GREP_PATTERN_TYPE_ERE, opt);
 232 }
 233
 234 static struct grep_pat *create_grep_pat(const char *pat, size_t patlen,
 235                                         const char *origin, int no,
 236                                         enum grep_pat_token t,
 237                                         enum grep_header_field field)
 238 {
 239         struct grep_pat *p = xcalloc(1, sizeof(*p));
 240         p->pattern = xmemdupz(pat, patlen);
 241         p->patternlen = patlen;
 242         p->origin = origin;
 243         p->no = no;
 244         p->token = t;
 245         p->field = field;
 246         return p;
 247 }
 248
 249 static void do_append_grep_pat(struct grep_pat ***tail, struct grep_pat *p)
 250 {
 251         **tail = p;
 252         *tail = &p->next;
 253         p->next = NULL;
 254
 255         switch (p->token) {
 256         case GREP_PATTERN: /* atom */
 257         case GREP_PATTERN_HEAD:
 258         case GREP_PATTERN_BODY:
 259                 for (;;) {
 260                         struct grep_pat *new_pat;
 261                         size_t len = 0;
 262                         char *cp = p->pattern + p->patternlen, *nl = NULL;
 263                         while (++len <= p->patternlen) {
 264                                 if (*(--cp) == '\n') {
 265                                         nl = cp;
 266                                         break;
 267                                 }
 268                         }
 269                         if (!nl)
 270                                 break;
 271                         new_pat = create_grep_pat(nl + 1, len - 1, p->origin,
 272                                                   p->no, p->token, p->field);
 273                         new_pat->next = p->next;
 274                         if (!p->next)
 275                                 *tail = &new_pat->next;
 276                         p->next = new_pat;
 277                         *nl = '\0';
 278                         p->patternlen -= len;
 279                 }
 280                 break;
 281         default:
 282                 break;
 283         }
 284 }
 285
 286 void append_header_grep_pattern(struct grep_opt *opt,
 287                                 enum grep_header_field field, const char *pat)
 288 {
 289         struct grep_pat *p = create_grep_pat(pat, strlen(pat), "header", 0,
 290                                              GREP_PATTERN_HEAD, field);
 291         if (field == GREP_HEADER_REFLOG)
 292                 opt->use_reflog_filter = 1;
 293         do_append_grep_pat(&opt->header_tail, p);
 294 }
 295
 296 void append_grep_pattern(struct grep_opt *opt, const char *pat,
 297                          const char *origin, int no, enum grep_pat_token t)
 298 {
 299         append_grep_pat(opt, pat, strlen(pat), origin, no, t);
 300 }
 301
 302 void append_grep_pat(struct grep_opt *opt, const char *pat, size_t patlen,
 303                      const char *origin, int no, enum grep_pat_token t)
 304 {
 305         struct grep_pat *p = create_grep_pat(pat, patlen, origin, no, t, 0);
 306         do_append_grep_pat(&opt->pattern_tail, p);
 307 }
 308
 309 struct grep_opt *grep_opt_dup(const struct grep_opt *opt)
 310 {
 311         struct grep_pat *pat;
 312         struct grep_opt *ret = xmalloc(sizeof(struct grep_opt));
 313         *ret = *opt;
 314
 315         ret->pattern_list = NULL;
 316         ret->pattern_tail = &ret->pattern_list;
 317
 318         for(pat = opt->pattern_list; pat != NULL; pat = pat->next)
 319         {
 320                 if(pat->token == GREP_PATTERN_HEAD)
 321                         append_header_grep_pattern(ret, pat->field,
 322                                                    pat->pattern);
 323                 else
 324                         append_grep_pat(ret, pat->pattern, pat->patternlen,
 325                                         pat->origin, pat->no, pat->token);
 326         }
 327
 328         return ret;
 329 }
 330
 331 static NORETURN void compile_regexp_failed(const struct grep_pat *p,
 332                 const char *error)
 333 {
 334         char where[1024];
 335
 336         if (p->no)
 337                 xsnprintf(where, sizeof(where), "In '%s' at %d, ", p->origin, p->no);
 338         else if (p->origin)
 339                 xsnprintf(where, sizeof(where), "%s, ", p->origin);
 340         else
 341                 where[0] = 0;
 342
 343         die("%s'%s': %s", where, p->pattern, error);
 344 }
 345
 346 static int is_fixed(const char *s, size_t len)
 347 {
 348         size_t i;
 349
 350         for (i = 0; i < len; i++) {
 351                 if (is_regex_special(s[i]))
 352                         return 0;
 353         }
 354
 355         return 1;
 356 }
 357
 358 static int has_null(const char *s, size_t len)
 359 {
 360         /*
 361          * regcomp cannot accept patterns with NULs so when using it
 362          * we consider any pattern containing a NUL fixed.
 363          */
 364         if (memchr(s, 0, len))
 365                 return 1;
 366
 367         return 0;
 368 }
 369
 370 #ifdef USE_LIBPCRE1
 371 static void compile_pcre1_regexp(struct grep_pat *p, const struct grep_opt *opt)
 372 {
 373         const char *error;
 374         int erroffset;
 375         int options = PCRE_MULTILINE;
 376
 377         if (opt->ignore_case) {
 378                 if (has_non_ascii(p->pattern))
 379                         p->pcre1_tables = pcre_maketables();
 380                 options |= PCRE_CASELESS;
 381         }
 382         if (is_utf8_locale() && has_non_ascii(p->pattern))
 383                 options |= PCRE_UTF8;
 384
 385         p->pcre1_regexp = pcre_compile(p->pattern, options, &error, &erroffset,
 386                                       p->pcre1_tables);
 387         if (!p->pcre1_regexp)
 388                 compile_regexp_failed(p, error);
 389
 390         p->pcre1_extra_info = pcre_study(p->pcre1_regexp, GIT_PCRE_STUDY_JIT_COMPILE, &error);
 391         if (!p->pcre1_extra_info && error)
 392                 die("%s", error);
 393
 394 #ifdef GIT_PCRE1_USE_JIT
 395         pcre_config(PCRE_CONFIG_JIT, &p->pcre1_jit_on);
 396         if (p->pcre1_jit_on == 1) {
 397                 p->pcre1_jit_stack = pcre_jit_stack_alloc(1, 1024 * 1024);
 398                 if (!p->pcre1_jit_stack)
 399                         die("Couldn't allocate PCRE JIT stack");
 400                 pcre_assign_jit_stack(p->pcre1_extra_info, NULL, p->pcre1_jit_stack);
 401         } else if (p->pcre1_jit_on != 0) {
 402                 die("BUG: The pcre1_jit_on variable should be 0 or 1, not %d",
 403                     p->pcre1_jit_on);
 404         }
 405 #endif
 406 }
 407
 408 static int pcre1match(struct grep_pat *p, const char *line, const char *eol,
 409                 regmatch_t *match, int eflags)
 410 {
 411         int ovector[30], ret, flags = 0;
 412
 413         if (eflags & REG_NOTBOL)
 414                 flags |= PCRE_NOTBOL;
 415
 416 #ifdef GIT_PCRE1_USE_JIT
 417         if (p->pcre1_jit_on) {
 418                 ret = pcre_jit_exec(p->pcre1_regexp, p->pcre1_extra_info, line,
 419                                     eol - line, 0, flags, ovector,
 420                                     ARRAY_SIZE(ovector), p->pcre1_jit_stack);
 421         } else
 422 #endif
 423         {
 424                 ret = pcre_exec(p->pcre1_regexp, p->pcre1_extra_info, line,
 425                                 eol - line, 0, flags, ovector,
 426                                 ARRAY_SIZE(ovector));
 427         }
 428
 429         if (ret < 0 && ret != PCRE_ERROR_NOMATCH)
 430                 die("pcre_exec failed with error code %d", ret);
 431         if (ret > 0) {
 432                 ret = 0;
 433                 match->rm_so = ovector[0];
 434                 match->rm_eo = ovector[1];
 435         }
 436
 437         return ret;
 438 }
 439
 440 static void free_pcre1_regexp(struct grep_pat *p)
 441 {
 442         pcre_free(p->pcre1_regexp);
 443 #ifdef GIT_PCRE1_USE_JIT
 444         if (p->pcre1_jit_on) {
 445                 pcre_free_study(p->pcre1_extra_info);
 446                 pcre_jit_stack_free(p->pcre1_jit_stack);
 447         } else
 448 #endif
 449         {
 450                 pcre_free(p->pcre1_extra_info);
 451         }
 452         pcre_free((void *)p->pcre1_tables);
 453 }
 454 #else /* !USE_LIBPCRE1 */
 455 static void compile_pcre1_regexp(struct grep_pat *p, const struct grep_opt *opt)
 456 {
 457         die("cannot use Perl-compatible regexes when not compiled with USE_LIBPCRE");
 458 }
 459
 460 static int pcre1match(struct grep_pat *p, const char *line, const char *eol,
 461                 regmatch_t *match, int eflags)
 462 {
 463         return 1;
 464 }
 465
 466 static void free_pcre1_regexp(struct grep_pat *p)
 467 {
 468 }
 469 #endif /* !USE_LIBPCRE1 */
 470
 471 #ifdef USE_LIBPCRE2
 472 static void compile_pcre2_pattern(struct grep_pat *p, const struct grep_opt *opt)
 473 {
 474         int error;
 475         PCRE2_UCHAR errbuf[256];
 476         PCRE2_SIZE erroffset;
 477         int options = PCRE2_MULTILINE;
 478         const uint8_t *character_tables = NULL;
 479         int jitret;
 480         int patinforet;
 481         size_t jitsizearg;
 482
 483         assert(opt->pcre2);
 484
 485         p->pcre2_compile_context = NULL;
 486
 487         if (opt->ignore_case) {
 488                 if (has_non_ascii(p->pattern)) {
 489                         character_tables = pcre2_maketables(NULL);
 490                         p->pcre2_compile_context = pcre2_compile_context_create(NULL);
 491                         pcre2_set_character_tables(p->pcre2_compile_context, character_tables);
 492                 }
 493                 options |= PCRE2_CASELESS;
 494         }
 495         if (is_utf8_locale() && has_non_ascii(p->pattern))
 496                 options |= PCRE2_UTF;
 497
 498         p->pcre2_pattern = pcre2_compile((PCRE2_SPTR)p->pattern,
 499                                          p->patternlen, options, &error, &erroffset,
 500                                          p->pcre2_compile_context);
 501
 502         if (p->pcre2_pattern) {
 503                 p->pcre2_match_data = pcre2_match_data_create_from_pattern(p->pcre2_pattern, NULL);
 504                 if (!p->pcre2_match_data)
 505                         die("Couldn't allocate PCRE2 match data");
 506         } else {
 507                 pcre2_get_error_message(error, errbuf, sizeof(errbuf));
 508                 compile_regexp_failed(p, (const char *)&errbuf);
 509         }
 510
 511         pcre2_config(PCRE2_CONFIG_JIT, &p->pcre2_jit_on);
 512         if (p->pcre2_jit_on == 1) {
 513                 jitret = pcre2_jit_compile(p->pcre2_pattern, PCRE2_JIT_COMPLETE);
 514                 if (jitret)
 515                         die("Couldn't JIT the PCRE2 pattern '%s', got '%d'\n", p->pattern, jitret);
 516
 517                 /*
 518                  * The pcre2_config(PCRE2_CONFIG_JIT, ...) call just
 519                  * tells us whether the library itself supports JIT,
 520                  * but to see whether we're going to be actually using
 521                  * JIT we need to extract PCRE2_INFO_JITSIZE from the
 522                  * pattern *after* we do pcre2_jit_compile() above.
 523                  *
 524                  * This is because if the pattern contains the
 525                  * (*NO_JIT) verb (see pcre2syntax(3))
 526                  * pcre2_jit_compile() will exit early with 0. If we
 527                  * then proceed to call pcre2_jit_match() further down
 528                  * the line instead of pcre2_match() we'll either
 529                  * segfault (pre PCRE 10.31) or run into a fatal error
 530                  * (post PCRE2 10.31)
 531                  */
 532                 patinforet = pcre2_pattern_info(p->pcre2_pattern, PCRE2_INFO_JITSIZE, &jitsizearg);
 533                 if (patinforet)
 534                         BUG("pcre2_pattern_info() failed: %d", patinforet);
 535                 if (jitsizearg == 0) {
 536                         p->pcre2_jit_on = 0;
 537                         return;
 538                 }
 539
 540                 p->pcre2_jit_stack = pcre2_jit_stack_create(1, 1024 * 1024, NULL);
 541                 if (!p->pcre2_jit_stack)
 542                         die("Couldn't allocate PCRE2 JIT stack");
 543                 p->pcre2_match_context = pcre2_match_context_create(NULL);
 544                 if (!p->pcre2_match_context)
 545                         die("Couldn't allocate PCRE2 match context");
 546                 pcre2_jit_stack_assign(p->pcre2_match_context, NULL, p->pcre2_jit_stack);
 547         } else if (p->pcre2_jit_on != 0) {
 548                 die("BUG: The pcre2_jit_on variable should be 0 or 1, not %d",
 549                     p->pcre1_jit_on);
 550         }
 551 }
 552
 553 static int pcre2match(struct grep_pat *p, const char *line, const char *eol,
 554                 regmatch_t *match, int eflags)
 555 {
 556         int ret, flags = 0;
 557         PCRE2_SIZE *ovector;
 558         PCRE2_UCHAR errbuf[256];
 559
 560         if (eflags & REG_NOTBOL)
 561                 flags |= PCRE2_NOTBOL;
 562
 563         if (p->pcre2_jit_on)
 564                 ret = pcre2_jit_match(p->pcre2_pattern, (unsigned char *)line,
 565                                       eol - line, 0, flags, p->pcre2_match_data,
 566                                       NULL);
 567         else
 568                 ret = pcre2_match(p->pcre2_pattern, (unsigned char *)line,
 569                                   eol - line, 0, flags, p->pcre2_match_data,
 570                                   NULL);
 571
 572         if (ret < 0 && ret != PCRE2_ERROR_NOMATCH) {
 573                 pcre2_get_error_message(ret, errbuf, sizeof(errbuf));
 574                 die("%s failed with error code %d: %s",
 575                     (p->pcre2_jit_on ? "pcre2_jit_match" : "pcre2_match"), ret,
 576                     errbuf);
 577         }
 578         if (ret > 0) {
 579                 ovector = pcre2_get_ovector_pointer(p->pcre2_match_data);
 580                 ret = 0;
 581                 match->rm_so = (int)ovector[0];
 582                 match->rm_eo = (int)ovector[1];
 583         }
 584
 585         return ret;
 586 }
 587
 588 static void free_pcre2_pattern(struct grep_pat *p)
 589 {
 590         pcre2_compile_context_free(p->pcre2_compile_context);
 591         pcre2_code_free(p->pcre2_pattern);
 592         pcre2_match_data_free(p->pcre2_match_data);
 593         pcre2_jit_stack_free(p->pcre2_jit_stack);
 594         pcre2_match_context_free(p->pcre2_match_context);
 595 }
 596 #else /* !USE_LIBPCRE2 */
 597 static void compile_pcre2_pattern(struct grep_pat *p, const struct grep_opt *opt)
 598 {
 599         /*
 600          * Unreachable until USE_LIBPCRE2 becomes synonymous with
 601          * USE_LIBPCRE. See the sibling comment in
 602          * grep_set_pattern_type_option().
 603          */
 604         die("cannot use Perl-compatible regexes when not compiled with USE_LIBPCRE");
 605 }
 606
 607 static int pcre2match(struct grep_pat *p, const char *line, const char *eol,
 608                 regmatch_t *match, int eflags)
 609 {
 610         return 1;
 611 }
 612
 613 static void free_pcre2_pattern(struct grep_pat *p)
 614 {
 615 }
 616 #endif /* !USE_LIBPCRE2 */
 617
 618 static void compile_fixed_regexp(struct grep_pat *p, struct grep_opt *opt)
 619 {
 620         struct strbuf sb = STRBUF_INIT;
 621         int err;
 622         int regflags = 0;
 623
 624         basic_regex_quote_buf(&sb, p->pattern);
 625         if (opt->ignore_case)
 626                 regflags |= REG_ICASE;
 627         err = regcomp(&p->regexp, sb.buf, regflags);
 628         if (opt->debug)
 629                 fprintf(stderr, "fixed %s\n", sb.buf);
 630         strbuf_release(&sb);
 631         if (err) {
 632                 char errbuf[1024];
 633                 regerror(err, &p->regexp, errbuf, sizeof(errbuf));
 634                 regfree(&p->regexp);
 635                 compile_regexp_failed(p, errbuf);
 636         }
 637 }
 638
 639 static void compile_regexp(struct grep_pat *p, struct grep_opt *opt)
 640 {
 641         int ascii_only;
 642         int err;
 643         int regflags = REG_NEWLINE;
 644
 645         p->word_regexp = opt->word_regexp;
 646         p->ignore_case = opt->ignore_case;
 647         ascii_only     = !has_non_ascii(p->pattern);
 648
 649         /*
 650          * Even when -F (fixed) asks us to do a non-regexp search, we
 651          * may not be able to correctly case-fold when -i
 652          * (ignore-case) is asked (in which case, we'll synthesize a
 653          * regexp to match the pattern that matches regexp special
 654          * characters literally, while ignoring case differences).  On
 655          * the other hand, even without -F, if the pattern does not
 656          * have any regexp special characters and there is no need for
 657          * case-folding search, we can internally turn it into a
 658          * simple string match using kws.  p->fixed tells us if we
 659          * want to use kws.
 660          */
 661         if (opt->fixed ||
 662             has_null(p->pattern, p->patternlen) ||
 663             is_fixed(p->pattern, p->patternlen))
 664                 p->fixed = !p->ignore_case || ascii_only;
 665
 666         if (p->fixed) {
 667                 p->kws = kwsalloc(p->ignore_case ? tolower_trans_tbl : NULL);
 668                 kwsincr(p->kws, p->pattern, p->patternlen);
 669                 kwsprep(p->kws);
 670                 return;
 671         } else if (opt->fixed) {
 672                 /*
 673                  * We come here when the pattern has the non-ascii
 674                  * characters we cannot case-fold, and asked to
 675                  * ignore-case.
 676                  */
 677                 compile_fixed_regexp(p, opt);
 678                 return;
 679         }
 680
 681         if (opt->pcre2) {
 682                 compile_pcre2_pattern(p, opt);
 683                 return;
 684         }
 685
 686         if (opt->pcre1) {
 687                 compile_pcre1_regexp(p, opt);
 688                 return;
 689         }
 690
 691         if (p->ignore_case)
 692                 regflags |= REG_ICASE;
 693         if (opt->extended_regexp_option)
 694                 regflags |= REG_EXTENDED;
 695         err = regcomp(&p->regexp, p->pattern, regflags);
 696         if (err) {
 697                 char errbuf[1024];
 698                 regerror(err, &p->regexp, errbuf, 1024);
 699                 regfree(&p->regexp);
 700                 compile_regexp_failed(p, errbuf);
 701         }
 702 }
 703
 704 static struct grep_expr *compile_pattern_or(struct grep_pat **);
 705 static struct grep_expr *compile_pattern_atom(struct grep_pat **list)
 706 {
 707         struct grep_pat *p;
 708         struct grep_expr *x;
 709
 710         p = *list;
 711         if (!p)
 712                 return NULL;
 713         switch (p->token) {
 714         case GREP_PATTERN: /* atom */
 715         case GREP_PATTERN_HEAD:
 716         case GREP_PATTERN_BODY:
 717                 x = xcalloc(1, sizeof (struct grep_expr));
 718                 x->node = GREP_NODE_ATOM;
 719                 x->u.atom = p;
 720                 *list = p->next;
 721                 return x;
 722         case GREP_OPEN_PAREN:
 723                 *list = p->next;
 724                 x = compile_pattern_or(list);
 725                 if (!*list || (*list)->token != GREP_CLOSE_PAREN)
 726                         die("unmatched parenthesis");
 727                 *list = (*list)->next;
 728                 return x;
 729         default:
 730                 return NULL;
 731         }
 732 }
 733
 734 static struct grep_expr *compile_pattern_not(struct grep_pat **list)
 735 {
 736         struct grep_pat *p;
 737         struct grep_expr *x;
 738
 739         p = *list;
 740         if (!p)
 741                 return NULL;
 742         switch (p->token) {
 743         case GREP_NOT:
 744                 if (!p->next)
 745                         die("--not not followed by pattern expression");
 746                 *list = p->next;
 747                 x = xcalloc(1, sizeof (struct grep_expr));
 748                 x->node = GREP_NODE_NOT;
 749                 x->u.unary = compile_pattern_not(list);
 750                 if (!x->u.unary)
 751                         die("--not followed by non pattern expression");
 752                 return x;
 753         default:
 754                 return compile_pattern_atom(list);
 755         }
 756 }
 757
 758 static struct grep_expr *compile_pattern_and(struct grep_pat **list)
 759 {
 760         struct grep_pat *p;
 761         struct grep_expr *x, *y, *z;
 762
 763         x = compile_pattern_not(list);
 764         p = *list;
 765         if (p && p->token == GREP_AND) {
 766                 if (!p->next)
 767                         die("--and not followed by pattern expression");
 768                 *list = p->next;
 769                 y = compile_pattern_and(list);
 770                 if (!y)
 771                         die("--and not followed by pattern expression");
 772                 z = xcalloc(1, sizeof (struct grep_expr));
 773                 z->node = GREP_NODE_AND;
 774                 z->u.binary.left = x;
 775                 z->u.binary.right = y;
 776                 return z;
 777         }
 778         return x;
 779 }
 780
 781 static struct grep_expr *compile_pattern_or(struct grep_pat **list)
 782 {
 783         struct grep_pat *p;
 784         struct grep_expr *x, *y, *z;
 785
 786         x = compile_pattern_and(list);
 787         p = *list;
 788         if (x && p && p->token != GREP_CLOSE_PAREN) {
 789                 y = compile_pattern_or(list);
 790                 if (!y)
 791                         die("not a pattern expression %s", p->pattern);
 792                 z = xcalloc(1, sizeof (struct grep_expr));
 793                 z->node = GREP_NODE_OR;
 794                 z->u.binary.left = x;
 795                 z->u.binary.right = y;
 796                 return z;
 797         }
 798         return x;
 799 }
 800
 801 static struct grep_expr *compile_pattern_expr(struct grep_pat **list)
 802 {
 803         return compile_pattern_or(list);
 804 }
 805
 806 static void indent(int in)
 807 {
 808         while (in-- > 0)
 809                 fputc(' ', stderr);
 810 }
 811
 812 static void dump_grep_pat(struct grep_pat *p)
 813 {
 814         switch (p->token) {
 815         case GREP_AND: fprintf(stderr, "*and*"); break;
 816         case GREP_OPEN_PAREN: fprintf(stderr, "*(*"); break;
 817         case GREP_CLOSE_PAREN: fprintf(stderr, "*)*"); break;
 818         case GREP_NOT: fprintf(stderr, "*not*"); break;
 819         case GREP_OR: fprintf(stderr, "*or*"); break;
 820
 821         case GREP_PATTERN: fprintf(stderr, "pattern"); break;
 822         case GREP_PATTERN_HEAD: fprintf(stderr, "pattern_head"); break;
 823         case GREP_PATTERN_BODY: fprintf(stderr, "pattern_body"); break;
 824         }
 825
 826         switch (p->token) {
 827         default: break;
 828         case GREP_PATTERN_HEAD:
 829                 fprintf(stderr, "<head %d>", p->field); break;
 830         case GREP_PATTERN_BODY:
 831                 fprintf(stderr, "<body>"); break;
 832         }
 833         switch (p->token) {
 834         default: break;
 835         case GREP_PATTERN_HEAD:
 836         case GREP_PATTERN_BODY:
 837         case GREP_PATTERN:
 838                 fprintf(stderr, "%.*s", (int)p->patternlen, p->pattern);
 839                 break;
 840         }
 841         fputc('\n', stderr);
 842 }
 843
 844 static void dump_grep_expression_1(struct grep_expr *x, int in)
 845 {
 846         indent(in);
 847         switch (x->node) {
 848         case GREP_NODE_TRUE:
 849                 fprintf(stderr, "true\n");
 850                 break;
 851         case GREP_NODE_ATOM:
 852                 dump_grep_pat(x->u.atom);
 853                 break;
 854         case GREP_NODE_NOT:
 855                 fprintf(stderr, "(not\n");
 856                 dump_grep_expression_1(x->u.unary, in+1);
 857                 indent(in);
 858                 fprintf(stderr, ")\n");
 859                 break;
 860         case GREP_NODE_AND:
 861                 fprintf(stderr, "(and\n");
 862                 dump_grep_expression_1(x->u.binary.left, in+1);
 863                 dump_grep_expression_1(x->u.binary.right, in+1);
 864                 indent(in);
 865                 fprintf(stderr, ")\n");
 866                 break;
 867         case GREP_NODE_OR:
 868                 fprintf(stderr, "(or\n");
 869                 dump_grep_expression_1(x->u.binary.left, in+1);
 870                 dump_grep_expression_1(x->u.binary.right, in+1);
 871                 indent(in);
 872                 fprintf(stderr, ")\n");
 873                 break;
 874         }
 875 }
 876
 877 static void dump_grep_expression(struct grep_opt *opt)
 878 {
 879         struct grep_expr *x = opt->pattern_expression;
 880
 881         if (opt->all_match)
 882                 fprintf(stderr, "[all-match]\n");
 883         dump_grep_expression_1(x, 0);
 884         fflush(NULL);
 885 }
 886
 887 static struct grep_expr *grep_true_expr(void)
 888 {
 889         struct grep_expr *z = xcalloc(1, sizeof(*z));
 890         z->node = GREP_NODE_TRUE;
 891         return z;
 892 }
 893
 894 static struct grep_expr *grep_or_expr(struct grep_expr *left, struct grep_expr *right)
 895 {
 896         struct grep_expr *z = xcalloc(1, sizeof(*z));
 897         z->node = GREP_NODE_OR;
 898         z->u.binary.left = left;
 899         z->u.binary.right = right;
 900         return z;
 901 }
 902
 903 static struct grep_expr *prep_header_patterns(struct grep_opt *opt)
 904 {
 905         struct grep_pat *p;
 906         struct grep_expr *header_expr;
 907         struct grep_expr *(header_group[GREP_HEADER_FIELD_MAX]);
 908         enum grep_header_field fld;
 909
 910         if (!opt->header_list)
 911                 return NULL;
 912
 913         for (p = opt->header_list; p; p = p->next) {
 914                 if (p->token != GREP_PATTERN_HEAD)
 915                         die("BUG: a non-header pattern in grep header list.");
 916                 if (p->field < GREP_HEADER_FIELD_MIN ||
 917                     GREP_HEADER_FIELD_MAX <= p->field)
 918                         die("BUG: unknown header field %d", p->field);
 919                 compile_regexp(p, opt);
 920         }
 921
 922         for (fld = 0; fld < GREP_HEADER_FIELD_MAX; fld++)
 923                 header_group[fld] = NULL;
 924
 925         for (p = opt->header_list; p; p = p->next) {
 926                 struct grep_expr *h;
 927                 struct grep_pat *pp = p;
 928
 929                 h = compile_pattern_atom(&pp);
 930                 if (!h || pp != p->next)
 931                         die("BUG: malformed header expr");
 932                 if (!header_group[p->field]) {
 933                         header_group[p->field] = h;
 934                         continue;
 935                 }
 936                 header_group[p->field] = grep_or_expr(h, header_group[p->field]);
 937         }
 938
 939         header_expr = NULL;
 940
 941         for (fld = 0; fld < GREP_HEADER_FIELD_MAX; fld++) {
 942                 if (!header_group[fld])
 943                         continue;
 944                 if (!header_expr)
 945                         header_expr = grep_true_expr();
 946                 header_expr = grep_or_expr(header_group[fld], header_expr);
 947         }
 948         return header_expr;
 949 }
 950
 951 static struct grep_expr *grep_splice_or(struct grep_expr *x, struct grep_expr *y)
 952 {
 953         struct grep_expr *z = x;
 954
 955         while (x) {
 956                 assert(x->node == GREP_NODE_OR);
 957                 if (x->u.binary.right &&
 958                     x->u.binary.right->node == GREP_NODE_TRUE) {
 959                         x->u.binary.right = y;
 960                         break;
 961                 }
 962                 x = x->u.binary.right;
 963         }
 964         return z;
 965 }
 966
 967 static void compile_grep_patterns_real(struct grep_opt *opt)
 968 {
 969         struct grep_pat *p;
 970         struct grep_expr *header_expr = prep_header_patterns(opt);
 971
 972         for (p = opt->pattern_list; p; p = p->next) {
 973                 switch (p->token) {
 974                 case GREP_PATTERN: /* atom */
 975                 case GREP_PATTERN_HEAD:
 976                 case GREP_PATTERN_BODY:
 977                         compile_regexp(p, opt);
 978                         break;
 979                 default:
 980                         opt->extended = 1;
 981                         break;
 982                 }
 983         }
 984
 985         if (opt->all_match || header_expr)
 986                 opt->extended = 1;
 987         else if (!opt->extended && !opt->debug)
 988                 return;
 989
 990         p = opt->pattern_list;
 991         if (p)
 992                 opt->pattern_expression = compile_pattern_expr(&p);
 993         if (p)
 994                 die("incomplete pattern expression: %s", p->pattern);
 995
 996         if (!header_expr)
 997                 return;
 998
 999         if (!opt->pattern_expression)
1000                 opt->pattern_expression = header_expr;
1001         else if (opt->all_match)
1002                 opt->pattern_expression = grep_splice_or(header_expr,
1003                                                          opt->pattern_expression);
1004         else
1005                 opt->pattern_expression = grep_or_expr(opt->pattern_expression,
1006                                                        header_expr);
1007         opt->all_match = 1;
1008 }
1009
1010 void compile_grep_patterns(struct grep_opt *opt)
1011 {
1012         compile_grep_patterns_real(opt);
1013         if (opt->debug)
1014                 dump_grep_expression(opt);
1015 }
1016
1017 static void free_pattern_expr(struct grep_expr *x)
1018 {
1019         switch (x->node) {
1020         case GREP_NODE_TRUE:
1021         case GREP_NODE_ATOM:
1022                 break;
1023         case GREP_NODE_NOT:
1024                 free_pattern_expr(x->u.unary);
1025                 break;
1026         case GREP_NODE_AND:
1027         case GREP_NODE_OR:
1028                 free_pattern_expr(x->u.binary.left);
1029                 free_pattern_expr(x->u.binary.right);
1030                 break;
1031         }
1032         free(x);
1033 }
1034
1035 void free_grep_patterns(struct grep_opt *opt)
1036 {
1037         struct grep_pat *p, *n;
1038
1039         for (p = opt->pattern_list; p; p = n) {
1040                 n = p->next;
1041                 switch (p->token) {
1042                 case GREP_PATTERN: /* atom */
1043                 case GREP_PATTERN_HEAD:
1044                 case GREP_PATTERN_BODY:
1045                         if (p->kws)
1046                                 kwsfree(p->kws);
1047                         else if (p->pcre1_regexp)
1048                                 free_pcre1_regexp(p);
1049                         else if (p->pcre2_pattern)
1050                                 free_pcre2_pattern(p);
1051                         else
1052                                 regfree(&p->regexp);
1053                         free(p->pattern);
1054                         break;
1055                 default:
1056                         break;
1057                 }
1058                 free(p);
1059         }
1060
1061         if (!opt->extended)
1062                 return;
1063         free_pattern_expr(opt->pattern_expression);
1064 }
1065
1066 static char *end_of_line(char *cp, unsigned long *left)
1067 {
1068         unsigned long l = *left;
1069         while (l && *cp != '\n') {
1070                 l--;
1071                 cp++;
1072         }
1073         *left = l;
1074         return cp;
1075 }
1076
1077 static int word_char(char ch)
1078 {
1079         return isalnum(ch) || ch == '_';
1080 }
1081
1082 static void output_color(struct grep_opt *opt, const void *data, size_t size,
1083                          const char *color)
1084 {
1085         if (want_color(opt->color) && color && color[0]) {
1086                 opt->output(opt, color, strlen(color));
1087                 opt->output(opt, data, size);
1088                 opt->output(opt, GIT_COLOR_RESET, strlen(GIT_COLOR_RESET));
1089         } else
1090                 opt->output(opt, data, size);
1091 }
1092
1093 static void output_sep(struct grep_opt *opt, char sign)
1094 {
1095         if (opt->null_following_name)
1096                 opt->output(opt, "\0", 1);
1097         else
1098                 output_color(opt, &sign, 1, opt->color_sep);
1099 }
1100
1101 static void show_name(struct grep_opt *opt, const char *name)
1102 {
1103         output_color(opt, name, strlen(name), opt->color_filename);
1104         opt->output(opt, opt->null_following_name ? "\0" : "\n", 1);
1105 }
1106
1107 static int fixmatch(struct grep_pat *p, char *line, char *eol,
1108                     regmatch_t *match)
1109 {
1110         struct kwsmatch kwsm;
1111         size_t offset = kwsexec(p->kws, line, eol - line, &kwsm);
1112         if (offset == -1) {
1113                 match->rm_so = match->rm_eo = -1;
1114                 return REG_NOMATCH;
1115         } else {
1116                 match->rm_so = offset;
1117                 match->rm_eo = match->rm_so + kwsm.size[0];
1118                 return 0;
1119         }
1120 }
1121
1122 static int patmatch(struct grep_pat *p, char *line, char *eol,
1123                     regmatch_t *match, int eflags)
1124 {
1125         int hit;
1126
1127         if (p->fixed)
1128                 hit = !fixmatch(p, line, eol, match);
1129         else if (p->pcre1_regexp)
1130                 hit = !pcre1match(p, line, eol, match, eflags);
1131         else if (p->pcre2_pattern)
1132                 hit = !pcre2match(p, line, eol, match, eflags);
1133         else
1134                 hit = !regexec_buf(&p->regexp, line, eol - line, 1, match,
1135                                    eflags);
1136
1137         return hit;
1138 }
1139
1140 static int strip_timestamp(char *bol, char **eol_p)
1141 {
1142         char *eol = *eol_p;
1143         int ch;
1144
1145         while (bol < --eol) {
1146                 if (*eol != '>')
1147                         continue;
1148                 *eol_p = ++eol;
1149                 ch = *eol;
1150                 *eol = '\0';
1151                 return ch;
1152         }
1153         return 0;
1154 }
1155
1156 static struct {
1157         const char *field;
1158         size_t len;
1159 } header_field[] = {
1160         { "author ", 7 },
1161         { "committer ", 10 },
1162         { "reflog ", 7 },
1163 };
1164
1165 static int match_one_pattern(struct grep_pat *p, char *bol, char *eol,
1166                              enum grep_context ctx,
1167                              regmatch_t *pmatch, int eflags)
1168 {
1169         int hit = 0;
1170         int saved_ch = 0;
1171         const char *start = bol;
1172
1173         if ((p->token != GREP_PATTERN) &&
1174             ((p->token == GREP_PATTERN_HEAD) != (ctx == GREP_CONTEXT_HEAD)))
1175                 return 0;
1176
1177         if (p->token == GREP_PATTERN_HEAD) {
1178                 const char *field;
1179                 size_t len;
1180                 assert(p->field < ARRAY_SIZE(header_field));
1181                 field = header_field[p->field].field;
1182                 len = header_field[p->field].len;
1183                 if (strncmp(bol, field, len))
1184                         return 0;
1185                 bol += len;
1186                 switch (p->field) {
1187                 case GREP_HEADER_AUTHOR:
1188                 case GREP_HEADER_COMMITTER:
1189                         saved_ch = strip_timestamp(bol, &eol);
1190                         break;
1191                 default:
1192                         break;
1193                 }
1194         }
1195
1196  again:
1197         hit = patmatch(p, bol, eol, pmatch, eflags);
1198
1199         if (hit && p->word_regexp) {
1200                 if ((pmatch[0].rm_so < 0) ||
1201                     (eol - bol) < pmatch[0].rm_so ||
1202                     (pmatch[0].rm_eo < 0) ||
1203                     (eol - bol) < pmatch[0].rm_eo)
1204                         die("regexp returned nonsense");
1205
1206                 /* Match beginning must be either beginning of the
1207                  * line, or at word boundary (i.e. the last char must
1208                  * not be a word char).  Similarly, match end must be
1209                  * either end of the line, or at word boundary
1210                  * (i.e. the next char must not be a word char).
1211                  */
1212                 if ( ((pmatch[0].rm_so == 0) ||
1213                       !word_char(bol[pmatch[0].rm_so-1])) &&
1214                      ((pmatch[0].rm_eo == (eol-bol)) ||
1215                       !word_char(bol[pmatch[0].rm_eo])) )
1216                         ;
1217                 else
1218                         hit = 0;
1219
1220                 /* Words consist of at least one character. */
1221                 if (pmatch->rm_so == pmatch->rm_eo)
1222                         hit = 0;
1223
1224                 if (!hit && pmatch[0].rm_so + bol + 1 < eol) {
1225                         /* There could be more than one match on the
1226                          * line, and the first match might not be
1227                          * strict word match.  But later ones could be!
1228                          * Forward to the next possible start, i.e. the
1229                          * next position following a non-word char.
1230                          */
1231                         bol = pmatch[0].rm_so + bol + 1;
1232                         while (word_char(bol[-1]) && bol < eol)
1233                                 bol++;
1234                         eflags |= REG_NOTBOL;
1235                         if (bol < eol)
1236                                 goto again;
1237                 }
1238         }
1239         if (p->token == GREP_PATTERN_HEAD && saved_ch)
1240                 *eol = saved_ch;
1241         if (hit) {
1242                 pmatch[0].rm_so += bol - start;
1243                 pmatch[0].rm_eo += bol - start;
1244         }
1245         return hit;
1246 }
1247
1248 static int match_expr_eval(struct grep_expr *x, char *bol, char *eol,
1249                            enum grep_context ctx, int collect_hits)
1250 {
1251         int h = 0;
1252         regmatch_t match;
1253
1254         if (!x)
1255                 die("Not a valid grep expression");
1256         switch (x->node) {
1257         case GREP_NODE_TRUE:
1258                 h = 1;
1259                 break;
1260         case GREP_NODE_ATOM:
1261                 h = match_one_pattern(x->u.atom, bol, eol, ctx, &match, 0);
1262                 break;
1263         case GREP_NODE_NOT:
1264                 h = !match_expr_eval(x->u.unary, bol, eol, ctx, 0);
1265                 break;
1266         case GREP_NODE_AND:
1267                 if (!match_expr_eval(x->u.binary.left, bol, eol, ctx, 0))
1268                         return 0;
1269                 h = match_expr_eval(x->u.binary.right, bol, eol, ctx, 0);
1270                 break;
1271         case GREP_NODE_OR:
1272                 if (!collect_hits)
1273                         return (match_expr_eval(x->u.binary.left,
1274                                                 bol, eol, ctx, 0) ||
1275                                 match_expr_eval(x->u.binary.right,
1276                                                 bol, eol, ctx, 0));
1277                 h = match_expr_eval(x->u.binary.left, bol, eol, ctx, 0);
1278                 x->u.binary.left->hit |= h;
1279                 h |= match_expr_eval(x->u.binary.right, bol, eol, ctx, 1);
1280                 break;
1281         default:
1282                 die("Unexpected node type (internal error) %d", x->node);
1283         }
1284         if (collect_hits)
1285                 x->hit |= h;
1286         return h;
1287 }
1288
1289 static int match_expr(struct grep_opt *opt, char *bol, char *eol,
1290                       enum grep_context ctx, int collect_hits)
1291 {
1292         struct grep_expr *x = opt->pattern_expression;
1293         return match_expr_eval(x, bol, eol, ctx, collect_hits);
1294 }
1295
1296 static int match_line(struct grep_opt *opt, char *bol, char *eol,
1297                       enum grep_context ctx, int collect_hits)
1298 {
1299         struct grep_pat *p;
1300         regmatch_t match;
1301
1302         if (opt->extended)
1303                 return match_expr(opt, bol, eol, ctx, collect_hits);
1304
1305         /* we do not call with collect_hits without being extended */
1306         for (p = opt->pattern_list; p; p = p->next) {
1307                 if (match_one_pattern(p, bol, eol, ctx, &match, 0))
1308                         return 1;
1309         }
1310         return 0;
1311 }
1312
1313 static int match_next_pattern(struct grep_pat *p, char *bol, char *eol,
1314                               enum grep_context ctx,
1315                               regmatch_t *pmatch, int eflags)
1316 {
1317         regmatch_t match;
1318
1319         if (!match_one_pattern(p, bol, eol, ctx, &match, eflags))
1320                 return 0;
1321         if (match.rm_so < 0 || match.rm_eo < 0)
1322                 return 0;
1323         if (pmatch->rm_so >= 0 && pmatch->rm_eo >= 0) {
1324                 if (match.rm_so > pmatch->rm_so)
1325                         return 1;
1326                 if (match.rm_so == pmatch->rm_so && match.rm_eo < pmatch->rm_eo)
1327                         return 1;
1328         }
1329         pmatch->rm_so = match.rm_so;
1330         pmatch->rm_eo = match.rm_eo;
1331         return 1;
1332 }
1333
1334 static int next_match(struct grep_opt *opt, char *bol, char *eol,
1335                       enum grep_context ctx, regmatch_t *pmatch, int eflags)
1336 {
1337         struct grep_pat *p;
1338         int hit = 0;
1339
1340         pmatch->rm_so = pmatch->rm_eo = -1;
1341         if (bol < eol) {
1342                 for (p = opt->pattern_list; p; p = p->next) {
1343                         switch (p->token) {
1344                         case GREP_PATTERN: /* atom */
1345                         case GREP_PATTERN_HEAD:
1346                         case GREP_PATTERN_BODY:
1347                                 hit |= match_next_pattern(p, bol, eol, ctx,
1348                                                           pmatch, eflags);
1349                                 break;
1350                         default:
1351                                 break;
1352                         }
1353                 }
1354         }
1355         return hit;
1356 }
1357
1358 static void show_line(struct grep_opt *opt, char *bol, char *eol,
1359                       const char *name, unsigned lno, char sign)
1360 {
1361         int rest = eol - bol;
1362         const char *match_color, *line_color = NULL;
1363
1364         if (opt->file_break && opt->last_shown == 0) {
1365                 if (opt->show_hunk_mark)
1366                         opt->output(opt, "\n", 1);
1367         } else if (opt->pre_context || opt->post_context || opt->funcbody) {
1368                 if (opt->last_shown == 0) {
1369                         if (opt->show_hunk_mark) {
1370                                 output_color(opt, "--", 2, opt->color_sep);
1371                                 opt->output(opt, "\n", 1);
1372                         }
1373                 } else if (lno > opt->last_shown + 1) {
1374                         output_color(opt, "--", 2, opt->color_sep);
1375                         opt->output(opt, "\n", 1);
1376                 }
1377         }
1378         if (opt->heading && opt->last_shown == 0) {
1379                 output_color(opt, name, strlen(name), opt->color_filename);
1380                 opt->output(opt, "\n", 1);
1381         }
1382         opt->last_shown = lno;
1383
1384         if (!opt->heading && opt->pathname) {
1385                 output_color(opt, name, strlen(name), opt->color_filename);
1386                 output_sep(opt, sign);
1387         }
1388         if (opt->linenum) {
1389                 char buf[32];
1390                 xsnprintf(buf, sizeof(buf), "%d", lno);
1391                 output_color(opt, buf, strlen(buf), opt->color_lineno);
1392                 output_sep(opt, sign);
1393         }
1394         if (opt->color) {
1395                 regmatch_t match;
1396                 enum grep_context ctx = GREP_CONTEXT_BODY;
1397                 int ch = *eol;
1398                 int eflags = 0;
1399
1400                 if (sign == ':')
1401                         match_color = opt->color_match_selected;
1402                 else
1403                         match_color = opt->color_match_context;
1404                 if (sign == ':')
1405                         line_color = opt->color_selected;
1406                 else if (sign == '-')
1407                         line_color = opt->color_context;
1408                 else if (sign == '=')
1409                         line_color = opt->color_function;
1410                 *eol = '\0';
1411                 while (next_match(opt, bol, eol, ctx, &match, eflags)) {
1412                         if (match.rm_so == match.rm_eo)
1413                                 break;
1414
1415                         output_color(opt, bol, match.rm_so, line_color);
1416                         output_color(opt, bol + match.rm_so,
1417                                      match.rm_eo - match.rm_so, match_color);
1418                         bol += match.rm_eo;
1419                         rest -= match.rm_eo;
1420                         eflags = REG_NOTBOL;
1421                 }
1422                 *eol = ch;
1423         }
1424         output_color(opt, bol, rest, line_color);
1425         opt->output(opt, "\n", 1);
1426 }
1427
1428 #ifndef NO_PTHREADS
1429 int grep_use_locks;
1430
1431 /*
1432  * This lock protects access to the gitattributes machinery, which is
1433  * not thread-safe.
1434  */
1435 pthread_mutex_t grep_attr_mutex;
1436
1437 static inline void grep_attr_lock(void)
1438 {
1439         if (grep_use_locks)
1440                 pthread_mutex_lock(&grep_attr_mutex);
1441 }
1442
1443 static inline void grep_attr_unlock(void)
1444 {
1445         if (grep_use_locks)
1446                 pthread_mutex_unlock(&grep_attr_mutex);
1447 }
1448
1449 /*
1450  * Same as git_attr_mutex, but protecting the thread-unsafe object db access.
1451  */
1452 pthread_mutex_t grep_read_mutex;
1453
1454 #else
1455 #define grep_attr_lock()
1456 #define grep_attr_unlock()
1457 #endif
1458
1459 static int match_funcname(struct grep_opt *opt, struct grep_source *gs, char *bol, char *eol)
1460 {
1461         xdemitconf_t *xecfg = opt->priv;
1462         if (xecfg && !xecfg->find_func) {
1463                 grep_source_load_driver(gs);
1464                 if (gs->driver->funcname.pattern) {
1465                         const struct userdiff_funcname *pe = &gs->driver->funcname;
1466                         xdiff_set_find_func(xecfg, pe->pattern, pe->cflags);
1467                 } else {
1468                         xecfg = opt->priv = NULL;
1469                 }
1470         }
1471
1472         if (xecfg) {
1473                 char buf[1];
1474                 return xecfg->find_func(bol, eol - bol, buf, 1,
1475                                         xecfg->find_func_priv) >= 0;
1476         }
1477
1478         if (bol == eol)
1479                 return 0;
1480         if (isalpha(*bol) || *bol == '_' || *bol == '$')
1481                 return 1;
1482         return 0;
1483 }
1484
1485 static void show_funcname_line(struct grep_opt *opt, struct grep_source *gs,
1486                                char *bol, unsigned lno)
1487 {
1488         while (bol > gs->buf) {
1489                 char *eol = --bol;
1490
1491                 while (bol > gs->buf && bol[-1] != '\n')
1492                         bol--;
1493                 lno--;
1494
1495                 if (lno <= opt->last_shown)
1496                         break;
1497
1498                 if (match_funcname(opt, gs, bol, eol)) {
1499                         show_line(opt, bol, eol, gs->name, lno, '=');
1500                         break;
1501                 }
1502         }
1503 }
1504
1505 static int is_empty_line(const char *bol, const char *eol);
1506
1507 static void show_pre_context(struct grep_opt *opt, struct grep_source *gs,
1508                              char *bol, char *end, unsigned lno)
1509 {
1510         unsigned cur = lno, from = 1, funcname_lno = 0, orig_from;
1511         int funcname_needed = !!opt->funcname, comment_needed = 0;
1512
1513         if (opt->pre_context < lno)
1514                 from = lno - opt->pre_context;
1515         if (from <= opt->last_shown)
1516                 from = opt->last_shown + 1;
1517         orig_from = from;
1518         if (opt->funcbody) {
1519                 if (match_funcname(opt, gs, bol, end))
1520                         comment_needed = 1;
1521                 else
1522                         funcname_needed = 1;
1523                 from = opt->last_shown + 1;
1524         }
1525
1526         /* Rewind. */
1527         while (bol > gs->buf && cur > from) {
1528                 char *next_bol = bol;
1529                 char *eol = --bol;
1530
1531                 while (bol > gs->buf && bol[-1] != '\n')
1532                         bol--;
1533                 cur--;
1534                 if (comment_needed && (is_empty_line(bol, eol) ||
1535                                        match_funcname(opt, gs, bol, eol))) {
1536                         comment_needed = 0;
1537                         from = orig_from;
1538                         if (cur < from) {
1539                                 cur++;
1540                                 bol = next_bol;
1541                                 break;
1542                         }
1543                 }
1544                 if (funcname_needed && match_funcname(opt, gs, bol, eol)) {
1545                         funcname_lno = cur;
1546                         funcname_needed = 0;
1547                         if (opt->funcbody)
1548                                 comment_needed = 1;
1549                         else
1550                                 from = orig_from;
1551                 }
1552         }
1553
1554         /* We need to look even further back to find a function signature. */
1555         if (opt->funcname && funcname_needed)
1556                 show_funcname_line(opt, gs, bol, cur);
1557
1558         /* Back forward. */
1559         while (cur < lno) {
1560                 char *eol = bol, sign = (cur == funcname_lno) ? '=' : '-';
1561
1562                 while (*eol != '\n')
1563                         eol++;
1564                 show_line(opt, bol, eol, gs->name, cur, sign);
1565                 bol = eol + 1;
1566                 cur++;
1567         }
1568 }
1569
1570 static int should_lookahead(struct grep_opt *opt)
1571 {
1572         struct grep_pat *p;
1573
1574         if (opt->extended)
1575                 return 0; /* punt for too complex stuff */
1576         if (opt->invert)
1577                 return 0;
1578         for (p = opt->pattern_list; p; p = p->next) {
1579                 if (p->token != GREP_PATTERN)
1580                         return 0; /* punt for "header only" and stuff */
1581         }
1582         return 1;
1583 }
1584
1585 static int look_ahead(struct grep_opt *opt,
1586                       unsigned long *left_p,
1587                       unsigned *lno_p,
1588                       char **bol_p)
1589 {
1590         unsigned lno = *lno_p;
1591         char *bol = *bol_p;
1592         struct grep_pat *p;
1593         char *sp, *last_bol;
1594         regoff_t earliest = -1;
1595
1596         for (p = opt->pattern_list; p; p = p->next) {
1597                 int hit;
1598                 regmatch_t m;
1599
1600                 hit = patmatch(p, bol, bol + *left_p, &m, 0);
1601                 if (!hit || m.rm_so < 0 || m.rm_eo < 0)
1602                         continue;
1603                 if (earliest < 0 || m.rm_so < earliest)
1604                         earliest = m.rm_so;
1605         }
1606
1607         if (earliest < 0) {
1608                 *bol_p = bol + *left_p;
1609                 *left_p = 0;
1610                 return 1;
1611         }
1612         for (sp = bol + earliest; bol < sp && sp[-1] != '\n'; sp--)
1613                 ; /* find the beginning of the line */
1614         last_bol = sp;
1615
1616         for (sp = bol; sp < last_bol; sp++) {
1617                 if (*sp == '\n')
1618                         lno++;
1619         }
1620         *left_p -= last_bol - bol;
1621         *bol_p = last_bol;
1622         *lno_p = lno;
1623         return 0;
1624 }
1625
1626 static int fill_textconv_grep(struct userdiff_driver *driver,
1627                               struct grep_source *gs)
1628 {
1629         struct diff_filespec *df;
1630         char *buf;
1631         size_t size;
1632
1633         if (!driver || !driver->textconv)
1634                 return grep_source_load(gs);
1635
1636         /*
1637          * The textconv interface is intimately tied to diff_filespecs, so we
1638          * have to pretend to be one. If we could unify the grep_source
1639          * and diff_filespec structs, this mess could just go away.
1640          */
1641         df = alloc_filespec(gs->path);
1642         switch (gs->type) {
1643         case GREP_SOURCE_OID:
1644                 fill_filespec(df, gs->identifier, 1, 0100644);
1645                 break;
1646         case GREP_SOURCE_FILE:
1647                 fill_filespec(df, &null_oid, 0, 0100644);
1648                 break;
1649         default:
1650                 die("BUG: attempt to textconv something without a path?");
1651         }
1652
1653         /*
1654          * fill_textconv is not remotely thread-safe; it may load objects
1655          * behind the scenes, and it modifies the global diff tempfile
1656          * structure.
1657          */
1658         grep_read_lock();
1659         size = fill_textconv(driver, df, &buf);
1660         grep_read_unlock();
1661         free_filespec(df);
1662
1663         /*
1664          * The normal fill_textconv usage by the diff machinery would just keep
1665          * the textconv'd buf separate from the diff_filespec. But much of the
1666          * grep code passes around a grep_source and assumes that its "buf"
1667          * pointer is the beginning of the thing we are searching. So let's
1668          * install our textconv'd version into the grep_source, taking care not
1669          * to leak any existing buffer.
1670          */
1671         grep_source_clear_data(gs);
1672         gs->buf = buf;
1673         gs->size = size;
1674
1675         return 0;
1676 }
1677
1678 static int is_empty_line(const char *bol, const char *eol)
1679 {
1680         while (bol < eol && isspace(*bol))
1681                 bol++;
1682         return bol == eol;
1683 }
1684
1685 static int grep_source_1(struct grep_opt *opt, struct grep_source *gs, int collect_hits)
1686 {
1687         char *bol;
1688         char *peek_bol = NULL;
1689         unsigned long left;
1690         unsigned lno = 1;
1691         unsigned last_hit = 0;
1692         int binary_match_only = 0;
1693         unsigned count = 0;
1694         int try_lookahead = 0;
1695         int show_function = 0;
1696         struct userdiff_driver *textconv = NULL;
1697         enum grep_context ctx = GREP_CONTEXT_HEAD;
1698         xdemitconf_t xecfg;
1699
1700         if (!opt->output)
1701                 opt->output = std_output;
1702
1703         if (opt->pre_context || opt->post_context || opt->file_break ||
1704             opt->funcbody) {
1705                 /* Show hunk marks, except for the first file. */
1706                 if (opt->last_shown)
1707                         opt->show_hunk_mark = 1;
1708                 /*
1709                  * If we're using threads then we can't easily identify
1710                  * the first file.  Always put hunk marks in that case
1711                  * and skip the very first one later in work_done().
1712                  */
1713                 if (opt->output != std_output)
1714                         opt->show_hunk_mark = 1;
1715         }
1716         opt->last_shown = 0;
1717
1718         if (opt->allow_textconv) {
1719                 grep_source_load_driver(gs);
1720                 /*
1721                  * We might set up the shared textconv cache data here, which
1722                  * is not thread-safe.
1723                  */
1724                 grep_attr_lock();
1725                 textconv = userdiff_get_textconv(gs->driver);
1726                 grep_attr_unlock();
1727         }
1728
1729         /*
1730          * We know the result of a textconv is text, so we only have to care
1731          * about binary handling if we are not using it.
1732          */
1733         if (!textconv) {
1734                 switch (opt->binary) {
1735                 case GREP_BINARY_DEFAULT:
1736                         if (grep_source_is_binary(gs))
1737                                 binary_match_only = 1;
1738                         break;
1739                 case GREP_BINARY_NOMATCH:
1740                         if (grep_source_is_binary(gs))
1741                                 return 0; /* Assume unmatch */
1742                         break;
1743                 case GREP_BINARY_TEXT:
1744                         break;
1745                 default:
1746                         die("BUG: unknown binary handling mode");
1747                 }
1748         }
1749
1750         memset(&xecfg, 0, sizeof(xecfg));
1751         opt->priv = &xecfg;
1752
1753         try_lookahead = should_lookahead(opt);
1754
1755         if (fill_textconv_grep(textconv, gs) < 0)
1756                 return 0;
1757
1758         bol = gs->buf;
1759         left = gs->size;
1760         while (left) {
1761                 char *eol, ch;
1762                 int hit;
1763
1764                 /*
1765                  * look_ahead() skips quickly to the line that possibly
1766                  * has the next hit; don't call it if we need to do
1767                  * something more than just skipping the current line
1768                  * in response to an unmatch for the current line.  E.g.
1769                  * inside a post-context window, we will show the current
1770                  * line as a context around the previous hit when it
1771                  * doesn't hit.
1772                  */
1773                 if (try_lookahead
1774                     && !(last_hit
1775                          && (show_function ||
1776                              lno <= last_hit + opt->post_context))
1777                     && look_ahead(opt, &left, &lno, &bol))
1778                         break;
1779                 eol = end_of_line(bol, &left);
1780                 ch = *eol;
1781                 *eol = 0;
1782
1783                 if ((ctx == GREP_CONTEXT_HEAD) && (eol == bol))
1784                         ctx = GREP_CONTEXT_BODY;
1785
1786                 hit = match_line(opt, bol, eol, ctx, collect_hits);
1787                 *eol = ch;
1788
1789                 if (collect_hits)
1790                         goto next_line;
1791
1792                 /* "grep -v -e foo -e bla" should list lines
1793                  * that do not have either, so inversion should
1794                  * be done outside.
1795                  */
1796                 if (opt->invert)
1797                         hit = !hit;
1798                 if (opt->unmatch_name_only) {
1799                         if (hit)
1800                                 return 0;
1801                         goto next_line;
1802                 }
1803                 if (hit) {
1804                         count++;
1805                         if (opt->status_only)
1806                                 return 1;
1807                         if (opt->name_only) {
1808                                 show_name(opt, gs->name);
1809                                 return 1;
1810                         }
1811                         if (opt->count)
1812                                 goto next_line;
1813                         if (binary_match_only) {
1814                                 opt->output(opt, "Binary file ", 12);
1815                                 output_color(opt, gs->name, strlen(gs->name),
1816                                              opt->color_filename);
1817                                 opt->output(opt, " matches\n", 9);
1818                                 return 1;
1819                         }
1820                         /* Hit at this line.  If we haven't shown the
1821                          * pre-context lines, we would need to show them.
1822                          */
1823                         if (opt->pre_context || opt->funcbody)
1824                                 show_pre_context(opt, gs, bol, eol, lno);
1825                         else if (opt->funcname)
1826                                 show_funcname_line(opt, gs, bol, lno);
1827                         show_line(opt, bol, eol, gs->name, lno, ':');
1828                         last_hit = lno;
1829                         if (opt->funcbody)
1830                                 show_function = 1;
1831                         goto next_line;
1832                 }
1833                 if (show_function && (!peek_bol || peek_bol < bol)) {
1834                         unsigned long peek_left = left;
1835                         char *peek_eol = eol;
1836
1837                         /*
1838                          * Trailing empty lines are not interesting.
1839                          * Peek past them to see if they belong to the
1840                          * body of the current function.
1841                          */
1842                         peek_bol = bol;
1843                         while (is_empty_line(peek_bol, peek_eol)) {
1844                                 peek_bol = peek_eol + 1;
1845                                 peek_eol = end_of_line(peek_bol, &peek_left);
1846                         }
1847
1848                         if (match_funcname(opt, gs, peek_bol, peek_eol))
1849                                 show_function = 0;
1850                 }
1851                 if (show_function ||
1852                     (last_hit && lno <= last_hit + opt->post_context)) {
1853                         /* If the last hit is within the post context,
1854                          * we need to show this line.
1855                          */
1856                         show_line(opt, bol, eol, gs->name, lno, '-');
1857                 }
1858
1859         next_line:
1860                 bol = eol + 1;
1861                 if (!left)
1862                         break;
1863                 left--;
1864                 lno++;
1865         }
1866
1867         if (collect_hits)
1868                 return 0;
1869
1870         if (opt->status_only)
1871                 return opt->unmatch_name_only;
1872         if (opt->unmatch_name_only) {
1873                 /* We did not see any hit, so we want to show this */
1874                 show_name(opt, gs->name);
1875                 return 1;
1876         }
1877
1878         xdiff_clear_find_func(&xecfg);
1879         opt->priv = NULL;
1880
1881         /* NEEDSWORK:
1882          * The real "grep -c foo *.c" gives many "bar.c:0" lines,
1883          * which feels mostly useless but sometimes useful.  Maybe
1884          * make it another option?  For now suppress them.
1885          */
1886         if (opt->count && count) {
1887                 char buf[32];
1888                 if (opt->pathname) {
1889                         output_color(opt, gs->name, strlen(gs->name),
1890                                      opt->color_filename);
1891                         output_sep(opt, ':');
1892                 }
1893                 xsnprintf(buf, sizeof(buf), "%u\n", count);
1894                 opt->output(opt, buf, strlen(buf));
1895                 return 1;
1896         }
1897         return !!last_hit;
1898 }
1899
1900 static void clr_hit_marker(struct grep_expr *x)
1901 {
1902         /* All-hit markers are meaningful only at the very top level
1903          * OR node.
1904          */
1905         while (1) {
1906                 x->hit = 0;
1907                 if (x->node != GREP_NODE_OR)
1908                         return;
1909                 x->u.binary.left->hit = 0;
1910                 x = x->u.binary.right;
1911         }
1912 }
1913
1914 static int chk_hit_marker(struct grep_expr *x)
1915 {
1916         /* Top level nodes have hit markers.  See if they all are hits */
1917         while (1) {
1918                 if (x->node != GREP_NODE_OR)
1919                         return x->hit;
1920                 if (!x->u.binary.left->hit)
1921                         return 0;
1922                 x = x->u.binary.right;
1923         }
1924 }
1925
1926 int grep_source(struct grep_opt *opt, struct grep_source *gs)
1927 {
1928         /*
1929          * we do not have to do the two-pass grep when we do not check
1930          * buffer-wide "all-match".
1931          */
1932         if (!opt->all_match)
1933                 return grep_source_1(opt, gs, 0);
1934
1935         /* Otherwise the toplevel "or" terms hit a bit differently.
1936          * We first clear hit markers from them.
1937          */
1938         clr_hit_marker(opt->pattern_expression);
1939         grep_source_1(opt, gs, 1);
1940
1941         if (!chk_hit_marker(opt->pattern_expression))
1942                 return 0;
1943
1944         return grep_source_1(opt, gs, 0);
1945 }
1946
1947 int grep_buffer(struct grep_opt *opt, char *buf, unsigned long size)
1948 {
1949         struct grep_source gs;
1950         int r;
1951
1952         grep_source_init(&gs, GREP_SOURCE_BUF, NULL, NULL, NULL);
1953         gs.buf = buf;
1954         gs.size = size;
1955
1956         r = grep_source(opt, &gs);
1957
1958         grep_source_clear(&gs);
1959         return r;
1960 }
1961
1962 void grep_source_init(struct grep_source *gs, enum grep_source_type type,
1963                       const char *name, const char *path,
1964                       const void *identifier)
1965 {
1966         gs->type = type;
1967         gs->name = xstrdup_or_null(name);
1968         gs->path = xstrdup_or_null(path);
1969         gs->buf = NULL;
1970         gs->size = 0;
1971         gs->driver = NULL;
1972
1973         switch (type) {
1974         case GREP_SOURCE_FILE:
1975                 gs->identifier = xstrdup(identifier);
1976                 break;
1977         case GREP_SOURCE_OID:
1978                 gs->identifier = oiddup(identifier);
1979                 break;
1980         case GREP_SOURCE_BUF:
1981                 gs->identifier = NULL;
1982                 break;
1983         }
1984 }
1985
1986 void grep_source_clear(struct grep_source *gs)
1987 {
1988         FREE_AND_NULL(gs->name);
1989         FREE_AND_NULL(gs->path);
1990         FREE_AND_NULL(gs->identifier);
1991         grep_source_clear_data(gs);
1992 }
1993
1994 void grep_source_clear_data(struct grep_source *gs)
1995 {
1996         switch (gs->type) {
1997         case GREP_SOURCE_FILE:
1998         case GREP_SOURCE_OID:
1999                 FREE_AND_NULL(gs->buf);
2000                 gs->size = 0;
2001                 break;
2002         case GREP_SOURCE_BUF:
2003                 /* leave user-provided buf intact */
2004                 break;
2005         }
2006 }
2007
2008 static int grep_source_load_oid(struct grep_source *gs)
2009 {
2010         enum object_type type;
2011
2012         grep_read_lock();
2013         gs->buf = read_sha1_file(gs->identifier, &type, &gs->size);
2014         grep_read_unlock();
2015
2016         if (!gs->buf)
2017                 return error(_("'%s': unable to read %s"),
2018                              gs->name,
2019                              oid_to_hex(gs->identifier));
2020         return 0;
2021 }
2022
2023 static int grep_source_load_file(struct grep_source *gs)
2024 {
2025         const char *filename = gs->identifier;
2026         struct stat st;
2027         char *data;
2028         size_t size;
2029         int i;
2030
2031         if (lstat(filename, &st) < 0) {
2032         err_ret:
2033                 if (errno != ENOENT)
2034                         error_errno(_("failed to stat '%s'"), filename);
2035                 return -1;
2036         }
2037         if (!S_ISREG(st.st_mode))
2038                 return -1;
2039         size = xsize_t(st.st_size);
2040         i = open(filename, O_RDONLY);
2041         if (i < 0)
2042                 goto err_ret;
2043         data = xmallocz(size);
2044         if (st.st_size != read_in_full(i, data, size)) {
2045                 error_errno(_("'%s': short read"), filename);
2046                 close(i);
2047                 free(data);
2048                 return -1;
2049         }
2050         close(i);
2051
2052         gs->buf = data;
2053         gs->size = size;
2054         return 0;
2055 }
2056
2057 static int grep_source_load(struct grep_source *gs)
2058 {
2059         if (gs->buf)
2060                 return 0;
2061
2062         switch (gs->type) {
2063         case GREP_SOURCE_FILE:
2064                 return grep_source_load_file(gs);
2065         case GREP_SOURCE_OID:
2066                 return grep_source_load_oid(gs);
2067         case GREP_SOURCE_BUF:
2068                 return gs->buf ? 0 : -1;
2069         }
2070         die("BUG: invalid grep_source type to load");
2071 }
2072
2073 void grep_source_load_driver(struct grep_source *gs)
2074 {
2075         if (gs->driver)
2076                 return;
2077
2078         grep_attr_lock();
2079         if (gs->path)
2080                 gs->driver = userdiff_find_by_path(gs->path);
2081         if (!gs->driver)
2082                 gs->driver = userdiff_find_by_name("default");
2083         grep_attr_unlock();
2084 }
2085
2086 static int grep_source_is_binary(struct grep_source *gs)
2087 {
2088         grep_source_load_driver(gs);
2089         if (gs->driver->binary != -1)
2090                 return gs->driver->binary;
2091
2092         if (!grep_source_load(gs))
2093                 return buffer_is_binary(gs->buf, gs->size);
2094
2095         return 0;
2096 }