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 static void color_set(char *dst, const char *color_bytes)
  22 {
  23         xsnprintf(dst, COLOR_MAXLEN, "%s", color_bytes);
  24 }
  25
  26 /*
  27  * Initialize the grep_defaults template with hardcoded defaults.
  28  * We could let the compiler do this, but without C99 initializers
  29  * the code gets unwieldy and unreadable, so...
  30  */
  31 void init_grep_defaults(void)
  32 {
  33         struct grep_opt *opt = &grep_defaults;
  34         static int run_once;
  35
  36         if (run_once)
  37                 return;
  38         run_once++;
  39
  40         memset(opt, 0, sizeof(*opt));
  41         opt->relative = 1;
  42         opt->pathname = 1;
  43         opt->max_depth = -1;
  44         opt->pattern_type_option = GREP_PATTERN_TYPE_UNSPECIFIED;
  45         color_set(opt->color_context, "");
  46         color_set(opt->color_filename, "");
  47         color_set(opt->color_function, "");
  48         color_set(opt->color_lineno, "");
  49         color_set(opt->color_match_context, GIT_COLOR_BOLD_RED);
  50         color_set(opt->color_match_selected, GIT_COLOR_BOLD_RED);
  51         color_set(opt->color_selected, "");
  52         color_set(opt->color_sep, GIT_COLOR_CYAN);
  53         opt->color = -1;
  54         opt->output = std_output;
  55 }
  56
  57 static int parse_pattern_type_arg(const char *opt, const char *arg)
  58 {
  59         if (!strcmp(arg, "default"))
  60                 return GREP_PATTERN_TYPE_UNSPECIFIED;
  61         else if (!strcmp(arg, "basic"))
  62                 return GREP_PATTERN_TYPE_BRE;
  63         else if (!strcmp(arg, "extended"))
  64                 return GREP_PATTERN_TYPE_ERE;
  65         else if (!strcmp(arg, "fixed"))
  66                 return GREP_PATTERN_TYPE_FIXED;
  67         else if (!strcmp(arg, "perl"))
  68                 return GREP_PATTERN_TYPE_PCRE;
  69         die("bad %s argument: %s", opt, arg);
  70 }
  71
  72 /*
  73  * Read the configuration file once and store it in
  74  * the grep_defaults template.
  75  */
  76 int grep_config(const char *var, const char *value, void *cb)
  77 {
  78         struct grep_opt *opt = &grep_defaults;
  79         char *color = NULL;
  80
  81         if (userdiff_config(var, value) < 0)
  82                 return -1;
  83
  84         if (!strcmp(var, "grep.extendedregexp")) {
  85                 opt->extended_regexp_option = git_config_bool(var, value);
  86                 return 0;
  87         }
  88
  89         if (!strcmp(var, "grep.patterntype")) {
  90                 opt->pattern_type_option = parse_pattern_type_arg(var, value);
  91                 return 0;
  92         }
  93
  94         if (!strcmp(var, "grep.linenumber")) {
  95                 opt->linenum = git_config_bool(var, value);
  96                 return 0;
  97         }
  98
  99         if (!strcmp(var, "grep.fullname")) {
 100                 opt->relative = !git_config_bool(var, value);
 101                 return 0;
 102         }
 103
 104         if (!strcmp(var, "color.grep"))
 105                 opt->color = git_config_colorbool(var, value);
 106         else if (!strcmp(var, "color.grep.context"))
 107                 color = opt->color_context;
 108         else if (!strcmp(var, "color.grep.filename"))
 109                 color = opt->color_filename;
 110         else if (!strcmp(var, "color.grep.function"))
 111                 color = opt->color_function;
 112         else if (!strcmp(var, "color.grep.linenumber"))
 113                 color = opt->color_lineno;
 114         else if (!strcmp(var, "color.grep.matchcontext"))
 115                 color = opt->color_match_context;
 116         else if (!strcmp(var, "color.grep.matchselected"))
 117                 color = opt->color_match_selected;
 118         else if (!strcmp(var, "color.grep.selected"))
 119                 color = opt->color_selected;
 120         else if (!strcmp(var, "color.grep.separator"))
 121                 color = opt->color_sep;
 122         else if (!strcmp(var, "color.grep.match")) {
 123                 int rc = 0;
 124                 if (!value)
 125                         return config_error_nonbool(var);
 126                 rc |= color_parse(value, opt->color_match_context);
 127                 rc |= color_parse(value, opt->color_match_selected);
 128                 return rc;
 129         }
 130
 131         if (color) {
 132                 if (!value)
 133                         return config_error_nonbool(var);
 134                 return color_parse(value, color);
 135         }
 136         return 0;
 137 }
 138
 139 /*
 140  * Initialize one instance of grep_opt and copy the
 141  * default values from the template we read the configuration
 142  * information in an earlier call to git_config(grep_config).
 143  */
 144 void grep_init(struct grep_opt *opt, const char *prefix)
 145 {
 146         struct grep_opt *def = &grep_defaults;
 147
 148         memset(opt, 0, sizeof(*opt));
 149         opt->prefix = prefix;
 150         opt->prefix_length = (prefix && *prefix) ? strlen(prefix) : 0;
 151         opt->pattern_tail = &opt->pattern_list;
 152         opt->header_tail = &opt->header_list;
 153
 154         opt->color = def->color;
 155         opt->extended_regexp_option = def->extended_regexp_option;
 156         opt->pattern_type_option = def->pattern_type_option;
 157         opt->linenum = def->linenum;
 158         opt->max_depth = def->max_depth;
 159         opt->pathname = def->pathname;
 160         opt->relative = def->relative;
 161         opt->output = def->output;
 162
 163         color_set(opt->color_context, def->color_context);
 164         color_set(opt->color_filename, def->color_filename);
 165         color_set(opt->color_function, def->color_function);
 166         color_set(opt->color_lineno, def->color_lineno);
 167         color_set(opt->color_match_context, def->color_match_context);
 168         color_set(opt->color_match_selected, def->color_match_selected);
 169         color_set(opt->color_selected, def->color_selected);
 170         color_set(opt->color_sep, def->color_sep);
 171 }
 172
 173 static void grep_set_pattern_type_option(enum grep_pattern_type pattern_type, struct grep_opt *opt)
 174 {
 175         /*
 176          * When committing to the pattern type by setting the relevant
 177          * fields in grep_opt it's generally not necessary to zero out
 178          * the fields we're not choosing, since they won't have been
 179          * set by anything. The extended_regexp_option field is the
 180          * only exception to this.
 181          *
 182          * This is because in the process of parsing grep.patternType
 183          * & grep.extendedRegexp we set opt->pattern_type_option and
 184          * opt->extended_regexp_option, respectively. We then
 185          * internally use opt->extended_regexp_option to see if we're
 186          * compiling an ERE. It must be unset if that's not actually
 187          * the case.
 188          */
 189         if (pattern_type != GREP_PATTERN_TYPE_ERE &&
 190             opt->extended_regexp_option)
 191                 opt->extended_regexp_option = 0;
 192
 193         switch (pattern_type) {
 194         case GREP_PATTERN_TYPE_UNSPECIFIED:
 195                 /* fall through */
 196
 197         case GREP_PATTERN_TYPE_BRE:
 198                 break;
 199
 200         case GREP_PATTERN_TYPE_ERE:
 201                 opt->extended_regexp_option = 1;
 202                 break;
 203
 204         case GREP_PATTERN_TYPE_FIXED:
 205                 opt->fixed = 1;
 206                 break;
 207
 208         case GREP_PATTERN_TYPE_PCRE:
 209 #ifdef USE_LIBPCRE2
 210                 opt->pcre2 = 1;
 211 #else
 212                 /*
 213                  * It's important that pcre1 always be assigned to
 214                  * even when there's no USE_LIBPCRE* defined. We still
 215                  * call the PCRE stub function, it just dies with
 216                  * "cannot use Perl-compatible regexes[...]".
 217                  */
 218                 opt->pcre1 = 1;
 219 #endif
 220                 break;
 221         }
 222 }
 223
 224 void grep_commit_pattern_type(enum grep_pattern_type pattern_type, struct grep_opt *opt)
 225 {
 226         if (pattern_type != GREP_PATTERN_TYPE_UNSPECIFIED)
 227                 grep_set_pattern_type_option(pattern_type, opt);
 228         else if (opt->pattern_type_option != GREP_PATTERN_TYPE_UNSPECIFIED)
 229                 grep_set_pattern_type_option(opt->pattern_type_option, opt);
 230         else if (opt->extended_regexp_option)
 231                 /*
 232                  * This branch *must* happen after setting from the
 233                  * opt->pattern_type_option above, we don't want
 234                  * grep.extendedRegexp to override grep.patternType!
 235                  */
 236                 grep_set_pattern_type_option(GREP_PATTERN_TYPE_ERE, opt);
 237 }
 238
 239 static struct grep_pat *create_grep_pat(const char *pat, size_t patlen,
 240                                         const char *origin, int no,
 241                                         enum grep_pat_token t,
 242                                         enum grep_header_field field)
 243 {
 244         struct grep_pat *p = xcalloc(1, sizeof(*p));
 245         p->pattern = xmemdupz(pat, patlen);
 246         p->patternlen = patlen;
 247         p->origin = origin;
 248         p->no = no;
 249         p->token = t;
 250         p->field = field;
 251         return p;
 252 }
 253
 254 static void do_append_grep_pat(struct grep_pat ***tail, struct grep_pat *p)
 255 {
 256         **tail = p;
 257         *tail = &p->next;
 258         p->next = NULL;
 259
 260         switch (p->token) {
 261         case GREP_PATTERN: /* atom */
 262         case GREP_PATTERN_HEAD:
 263         case GREP_PATTERN_BODY:
 264                 for (;;) {
 265                         struct grep_pat *new_pat;
 266                         size_t len = 0;
 267                         char *cp = p->pattern + p->patternlen, *nl = NULL;
 268                         while (++len <= p->patternlen) {
 269                                 if (*(--cp) == '\n') {
 270                                         nl = cp;
 271                                         break;
 272                                 }
 273                         }
 274                         if (!nl)
 275                                 break;
 276                         new_pat = create_grep_pat(nl + 1, len - 1, p->origin,
 277                                                   p->no, p->token, p->field);
 278                         new_pat->next = p->next;
 279                         if (!p->next)
 280                                 *tail = &new_pat->next;
 281                         p->next = new_pat;
 282                         *nl = '\0';
 283                         p->patternlen -= len;
 284                 }
 285                 break;
 286         default:
 287                 break;
 288         }
 289 }
 290
 291 void append_header_grep_pattern(struct grep_opt *opt,
 292                                 enum grep_header_field field, const char *pat)
 293 {
 294         struct grep_pat *p = create_grep_pat(pat, strlen(pat), "header", 0,
 295                                              GREP_PATTERN_HEAD, field);
 296         if (field == GREP_HEADER_REFLOG)
 297                 opt->use_reflog_filter = 1;
 298         do_append_grep_pat(&opt->header_tail, p);
 299 }
 300
 301 void append_grep_pattern(struct grep_opt *opt, const char *pat,
 302                          const char *origin, int no, enum grep_pat_token t)
 303 {
 304         append_grep_pat(opt, pat, strlen(pat), origin, no, t);
 305 }
 306
 307 void append_grep_pat(struct grep_opt *opt, const char *pat, size_t patlen,
 308                      const char *origin, int no, enum grep_pat_token t)
 309 {
 310         struct grep_pat *p = create_grep_pat(pat, patlen, origin, no, t, 0);
 311         do_append_grep_pat(&opt->pattern_tail, p);
 312 }
 313
 314 struct grep_opt *grep_opt_dup(const struct grep_opt *opt)
 315 {
 316         struct grep_pat *pat;
 317         struct grep_opt *ret = xmalloc(sizeof(struct grep_opt));
 318         *ret = *opt;
 319
 320         ret->pattern_list = NULL;
 321         ret->pattern_tail = &ret->pattern_list;
 322
 323         for(pat = opt->pattern_list; pat != NULL; pat = pat->next)
 324         {
 325                 if(pat->token == GREP_PATTERN_HEAD)
 326                         append_header_grep_pattern(ret, pat->field,
 327                                                    pat->pattern);
 328                 else
 329                         append_grep_pat(ret, pat->pattern, pat->patternlen,
 330                                         pat->origin, pat->no, pat->token);
 331         }
 332
 333         return ret;
 334 }
 335
 336 static NORETURN void compile_regexp_failed(const struct grep_pat *p,
 337                 const char *error)
 338 {
 339         char where[1024];
 340
 341         if (p->no)
 342                 xsnprintf(where, sizeof(where), "In '%s' at %d, ", p->origin, p->no);
 343         else if (p->origin)
 344                 xsnprintf(where, sizeof(where), "%s, ", p->origin);
 345         else
 346                 where[0] = 0;
 347
 348         die("%s'%s': %s", where, p->pattern, error);
 349 }
 350
 351 static int is_fixed(const char *s, size_t len)
 352 {
 353         size_t i;
 354
 355         for (i = 0; i < len; i++) {
 356                 if (is_regex_special(s[i]))
 357                         return 0;
 358         }
 359
 360         return 1;
 361 }
 362
 363 static int has_null(const char *s, size_t len)
 364 {
 365         /*
 366          * regcomp cannot accept patterns with NULs so when using it
 367          * we consider any pattern containing a NUL fixed.
 368          */
 369         if (memchr(s, 0, len))
 370                 return 1;
 371
 372         return 0;
 373 }
 374
 375 #ifdef USE_LIBPCRE1
 376 static void compile_pcre1_regexp(struct grep_pat *p, const struct grep_opt *opt)
 377 {
 378         const char *error;
 379         int erroffset;
 380         int options = PCRE_MULTILINE;
 381
 382         if (opt->ignore_case) {
 383                 if (has_non_ascii(p->pattern))
 384                         p->pcre1_tables = pcre_maketables();
 385                 options |= PCRE_CASELESS;
 386         }
 387         if (is_utf8_locale() && has_non_ascii(p->pattern))
 388                 options |= PCRE_UTF8;
 389
 390         p->pcre1_regexp = pcre_compile(p->pattern, options, &error, &erroffset,
 391                                       p->pcre1_tables);
 392         if (!p->pcre1_regexp)
 393                 compile_regexp_failed(p, error);
 394
 395         p->pcre1_extra_info = pcre_study(p->pcre1_regexp, GIT_PCRE_STUDY_JIT_COMPILE, &error);
 396         if (!p->pcre1_extra_info && error)
 397                 die("%s", error);
 398
 399 #ifdef GIT_PCRE1_USE_JIT
 400         pcre_config(PCRE_CONFIG_JIT, &p->pcre1_jit_on);
 401         if (p->pcre1_jit_on == 1) {
 402                 p->pcre1_jit_stack = pcre_jit_stack_alloc(1, 1024 * 1024);
 403                 if (!p->pcre1_jit_stack)
 404                         die("Couldn't allocate PCRE JIT stack");
 405                 pcre_assign_jit_stack(p->pcre1_extra_info, NULL, p->pcre1_jit_stack);
 406         } else if (p->pcre1_jit_on != 0) {
 407                 BUG("The pcre1_jit_on variable should be 0 or 1, not %d",
 408                     p->pcre1_jit_on);
 409         }
 410 #endif
 411 }
 412
 413 static int pcre1match(struct grep_pat *p, const char *line, const char *eol,
 414                 regmatch_t *match, int eflags)
 415 {
 416         int ovector[30], ret, flags = 0;
 417
 418         if (eflags & REG_NOTBOL)
 419                 flags |= PCRE_NOTBOL;
 420
 421 #ifdef GIT_PCRE1_USE_JIT
 422         if (p->pcre1_jit_on) {
 423                 ret = pcre_jit_exec(p->pcre1_regexp, p->pcre1_extra_info, line,
 424                                     eol - line, 0, flags, ovector,
 425                                     ARRAY_SIZE(ovector), p->pcre1_jit_stack);
 426         } else
 427 #endif
 428         {
 429                 ret = pcre_exec(p->pcre1_regexp, p->pcre1_extra_info, line,
 430                                 eol - line, 0, flags, ovector,
 431                                 ARRAY_SIZE(ovector));
 432         }
 433
 434         if (ret < 0 && ret != PCRE_ERROR_NOMATCH)
 435                 die("pcre_exec failed with error code %d", ret);
 436         if (ret > 0) {
 437                 ret = 0;
 438                 match->rm_so = ovector[0];
 439                 match->rm_eo = ovector[1];
 440         }
 441
 442         return ret;
 443 }
 444
 445 static void free_pcre1_regexp(struct grep_pat *p)
 446 {
 447         pcre_free(p->pcre1_regexp);
 448 #ifdef GIT_PCRE1_USE_JIT
 449         if (p->pcre1_jit_on) {
 450                 pcre_free_study(p->pcre1_extra_info);
 451                 pcre_jit_stack_free(p->pcre1_jit_stack);
 452         } else
 453 #endif
 454         {
 455                 pcre_free(p->pcre1_extra_info);
 456         }
 457         pcre_free((void *)p->pcre1_tables);
 458 }
 459 #else /* !USE_LIBPCRE1 */
 460 static void compile_pcre1_regexp(struct grep_pat *p, const struct grep_opt *opt)
 461 {
 462         die("cannot use Perl-compatible regexes when not compiled with USE_LIBPCRE");
 463 }
 464
 465 static int pcre1match(struct grep_pat *p, const char *line, const char *eol,
 466                 regmatch_t *match, int eflags)
 467 {
 468         return 1;
 469 }
 470
 471 static void free_pcre1_regexp(struct grep_pat *p)
 472 {
 473 }
 474 #endif /* !USE_LIBPCRE1 */
 475
 476 #ifdef USE_LIBPCRE2
 477 static void compile_pcre2_pattern(struct grep_pat *p, const struct grep_opt *opt)
 478 {
 479         int error;
 480         PCRE2_UCHAR errbuf[256];
 481         PCRE2_SIZE erroffset;
 482         int options = PCRE2_MULTILINE;
 483         const uint8_t *character_tables = NULL;
 484         int jitret;
 485         int patinforet;
 486         size_t jitsizearg;
 487
 488         assert(opt->pcre2);
 489
 490         p->pcre2_compile_context = NULL;
 491
 492         if (opt->ignore_case) {
 493                 if (has_non_ascii(p->pattern)) {
 494                         character_tables = pcre2_maketables(NULL);
 495                         p->pcre2_compile_context = pcre2_compile_context_create(NULL);
 496                         pcre2_set_character_tables(p->pcre2_compile_context, character_tables);
 497                 }
 498                 options |= PCRE2_CASELESS;
 499         }
 500         if (is_utf8_locale() && has_non_ascii(p->pattern))
 501                 options |= PCRE2_UTF;
 502
 503         p->pcre2_pattern = pcre2_compile((PCRE2_SPTR)p->pattern,
 504                                          p->patternlen, options, &error, &erroffset,
 505                                          p->pcre2_compile_context);
 506
 507         if (p->pcre2_pattern) {
 508                 p->pcre2_match_data = pcre2_match_data_create_from_pattern(p->pcre2_pattern, NULL);
 509                 if (!p->pcre2_match_data)
 510                         die("Couldn't allocate PCRE2 match data");
 511         } else {
 512                 pcre2_get_error_message(error, errbuf, sizeof(errbuf));
 513                 compile_regexp_failed(p, (const char *)&errbuf);
 514         }
 515
 516         pcre2_config(PCRE2_CONFIG_JIT, &p->pcre2_jit_on);
 517         if (p->pcre2_jit_on == 1) {
 518                 jitret = pcre2_jit_compile(p->pcre2_pattern, PCRE2_JIT_COMPLETE);
 519                 if (jitret)
 520                         die("Couldn't JIT the PCRE2 pattern '%s', got '%d'\n", p->pattern, jitret);
 521
 522                 /*
 523                  * The pcre2_config(PCRE2_CONFIG_JIT, ...) call just
 524                  * tells us whether the library itself supports JIT,
 525                  * but to see whether we're going to be actually using
 526                  * JIT we need to extract PCRE2_INFO_JITSIZE from the
 527                  * pattern *after* we do pcre2_jit_compile() above.
 528                  *
 529                  * This is because if the pattern contains the
 530                  * (*NO_JIT) verb (see pcre2syntax(3))
 531                  * pcre2_jit_compile() will exit early with 0. If we
 532                  * then proceed to call pcre2_jit_match() further down
 533                  * the line instead of pcre2_match() we'll either
 534                  * segfault (pre PCRE 10.31) or run into a fatal error
 535                  * (post PCRE2 10.31)
 536                  */
 537                 patinforet = pcre2_pattern_info(p->pcre2_pattern, PCRE2_INFO_JITSIZE, &jitsizearg);
 538                 if (patinforet)
 539                         BUG("pcre2_pattern_info() failed: %d", patinforet);
 540                 if (jitsizearg == 0) {
 541                         p->pcre2_jit_on = 0;
 542                         return;
 543                 }
 544
 545                 p->pcre2_jit_stack = pcre2_jit_stack_create(1, 1024 * 1024, NULL);
 546                 if (!p->pcre2_jit_stack)
 547                         die("Couldn't allocate PCRE2 JIT stack");
 548                 p->pcre2_match_context = pcre2_match_context_create(NULL);
 549                 if (!p->pcre2_match_context)
 550                         die("Couldn't allocate PCRE2 match context");
 551                 pcre2_jit_stack_assign(p->pcre2_match_context, NULL, p->pcre2_jit_stack);
 552         } else if (p->pcre2_jit_on != 0) {
 553                 BUG("The pcre2_jit_on variable should be 0 or 1, not %d",
 554                     p->pcre1_jit_on);
 555         }
 556 }
 557
 558 static int pcre2match(struct grep_pat *p, const char *line, const char *eol,
 559                 regmatch_t *match, int eflags)
 560 {
 561         int ret, flags = 0;
 562         PCRE2_SIZE *ovector;
 563         PCRE2_UCHAR errbuf[256];
 564
 565         if (eflags & REG_NOTBOL)
 566                 flags |= PCRE2_NOTBOL;
 567
 568         if (p->pcre2_jit_on)
 569                 ret = pcre2_jit_match(p->pcre2_pattern, (unsigned char *)line,
 570                                       eol - line, 0, flags, p->pcre2_match_data,
 571                                       NULL);
 572         else
 573                 ret = pcre2_match(p->pcre2_pattern, (unsigned char *)line,
 574                                   eol - line, 0, flags, p->pcre2_match_data,
 575                                   NULL);
 576
 577         if (ret < 0 && ret != PCRE2_ERROR_NOMATCH) {
 578                 pcre2_get_error_message(ret, errbuf, sizeof(errbuf));
 579                 die("%s failed with error code %d: %s",
 580                     (p->pcre2_jit_on ? "pcre2_jit_match" : "pcre2_match"), ret,
 581                     errbuf);
 582         }
 583         if (ret > 0) {
 584                 ovector = pcre2_get_ovector_pointer(p->pcre2_match_data);
 585                 ret = 0;
 586                 match->rm_so = (int)ovector[0];
 587                 match->rm_eo = (int)ovector[1];
 588         }
 589
 590         return ret;
 591 }
 592
 593 static void free_pcre2_pattern(struct grep_pat *p)
 594 {
 595         pcre2_compile_context_free(p->pcre2_compile_context);
 596         pcre2_code_free(p->pcre2_pattern);
 597         pcre2_match_data_free(p->pcre2_match_data);
 598         pcre2_jit_stack_free(p->pcre2_jit_stack);
 599         pcre2_match_context_free(p->pcre2_match_context);
 600 }
 601 #else /* !USE_LIBPCRE2 */
 602 static void compile_pcre2_pattern(struct grep_pat *p, const struct grep_opt *opt)
 603 {
 604         /*
 605          * Unreachable until USE_LIBPCRE2 becomes synonymous with
 606          * USE_LIBPCRE. See the sibling comment in
 607          * grep_set_pattern_type_option().
 608          */
 609         die("cannot use Perl-compatible regexes when not compiled with USE_LIBPCRE");
 610 }
 611
 612 static int pcre2match(struct grep_pat *p, const char *line, const char *eol,
 613                 regmatch_t *match, int eflags)
 614 {
 615         return 1;
 616 }
 617
 618 static void free_pcre2_pattern(struct grep_pat *p)
 619 {
 620 }
 621 #endif /* !USE_LIBPCRE2 */
 622
 623 static void compile_fixed_regexp(struct grep_pat *p, struct grep_opt *opt)
 624 {
 625         struct strbuf sb = STRBUF_INIT;
 626         int err;
 627         int regflags = 0;
 628
 629         basic_regex_quote_buf(&sb, p->pattern);
 630         if (opt->ignore_case)
 631                 regflags |= REG_ICASE;
 632         err = regcomp(&p->regexp, sb.buf, regflags);
 633         if (opt->debug)
 634                 fprintf(stderr, "fixed %s\n", sb.buf);
 635         strbuf_release(&sb);
 636         if (err) {
 637                 char errbuf[1024];
 638                 regerror(err, &p->regexp, errbuf, sizeof(errbuf));
 639                 compile_regexp_failed(p, errbuf);
 640         }
 641 }
 642
 643 static void compile_regexp(struct grep_pat *p, struct grep_opt *opt)
 644 {
 645         int ascii_only;
 646         int err;
 647         int regflags = REG_NEWLINE;
 648
 649         p->word_regexp = opt->word_regexp;
 650         p->ignore_case = opt->ignore_case;
 651         ascii_only     = !has_non_ascii(p->pattern);
 652
 653         /*
 654          * Even when -F (fixed) asks us to do a non-regexp search, we
 655          * may not be able to correctly case-fold when -i
 656          * (ignore-case) is asked (in which case, we'll synthesize a
 657          * regexp to match the pattern that matches regexp special
 658          * characters literally, while ignoring case differences).  On
 659          * the other hand, even without -F, if the pattern does not
 660          * have any regexp special characters and there is no need for
 661          * case-folding search, we can internally turn it into a
 662          * simple string match using kws.  p->fixed tells us if we
 663          * want to use kws.
 664          */
 665         if (opt->fixed ||
 666             has_null(p->pattern, p->patternlen) ||
 667             is_fixed(p->pattern, p->patternlen))
 668                 p->fixed = !p->ignore_case || ascii_only;
 669
 670         if (p->fixed) {
 671                 p->kws = kwsalloc(p->ignore_case ? tolower_trans_tbl : NULL);
 672                 kwsincr(p->kws, p->pattern, p->patternlen);
 673                 kwsprep(p->kws);
 674                 return;
 675         } else if (opt->fixed) {
 676                 /*
 677                  * We come here when the pattern has the non-ascii
 678                  * characters we cannot case-fold, and asked to
 679                  * ignore-case.
 680                  */
 681                 compile_fixed_regexp(p, opt);
 682                 return;
 683         }
 684
 685         if (opt->pcre2) {
 686                 compile_pcre2_pattern(p, opt);
 687                 return;
 688         }
 689
 690         if (opt->pcre1) {
 691                 compile_pcre1_regexp(p, opt);
 692                 return;
 693         }
 694
 695         if (p->ignore_case)
 696                 regflags |= REG_ICASE;
 697         if (opt->extended_regexp_option)
 698                 regflags |= REG_EXTENDED;
 699         err = regcomp(&p->regexp, p->pattern, regflags);
 700         if (err) {
 701                 char errbuf[1024];
 702                 regerror(err, &p->regexp, errbuf, 1024);
 703                 compile_regexp_failed(p, errbuf);
 704         }
 705 }
 706
 707 static struct grep_expr *compile_pattern_or(struct grep_pat **);
 708 static struct grep_expr *compile_pattern_atom(struct grep_pat **list)
 709 {
 710         struct grep_pat *p;
 711         struct grep_expr *x;
 712
 713         p = *list;
 714         if (!p)
 715                 return NULL;
 716         switch (p->token) {
 717         case GREP_PATTERN: /* atom */
 718         case GREP_PATTERN_HEAD:
 719         case GREP_PATTERN_BODY:
 720                 x = xcalloc(1, sizeof (struct grep_expr));
 721                 x->node = GREP_NODE_ATOM;
 722                 x->u.atom = p;
 723                 *list = p->next;
 724                 return x;
 725         case GREP_OPEN_PAREN:
 726                 *list = p->next;
 727                 x = compile_pattern_or(list);
 728                 if (!*list || (*list)->token != GREP_CLOSE_PAREN)
 729                         die("unmatched parenthesis");
 730                 *list = (*list)->next;
 731                 return x;
 732         default:
 733                 return NULL;
 734         }
 735 }
 736
 737 static struct grep_expr *compile_pattern_not(struct grep_pat **list)
 738 {
 739         struct grep_pat *p;
 740         struct grep_expr *x;
 741
 742         p = *list;
 743         if (!p)
 744                 return NULL;
 745         switch (p->token) {
 746         case GREP_NOT:
 747                 if (!p->next)
 748                         die("--not not followed by pattern expression");
 749                 *list = p->next;
 750                 x = xcalloc(1, sizeof (struct grep_expr));
 751                 x->node = GREP_NODE_NOT;
 752                 x->u.unary = compile_pattern_not(list);
 753                 if (!x->u.unary)
 754                         die("--not followed by non pattern expression");
 755                 return x;
 756         default:
 757                 return compile_pattern_atom(list);
 758         }
 759 }
 760
 761 static struct grep_expr *compile_pattern_and(struct grep_pat **list)
 762 {
 763         struct grep_pat *p;
 764         struct grep_expr *x, *y, *z;
 765
 766         x = compile_pattern_not(list);
 767         p = *list;
 768         if (p && p->token == GREP_AND) {
 769                 if (!p->next)
 770                         die("--and not followed by pattern expression");
 771                 *list = p->next;
 772                 y = compile_pattern_and(list);
 773                 if (!y)
 774                         die("--and not followed by pattern expression");
 775                 z = xcalloc(1, sizeof (struct grep_expr));
 776                 z->node = GREP_NODE_AND;
 777                 z->u.binary.left = x;
 778                 z->u.binary.right = y;
 779                 return z;
 780         }
 781         return x;
 782 }
 783
 784 static struct grep_expr *compile_pattern_or(struct grep_pat **list)
 785 {
 786         struct grep_pat *p;
 787         struct grep_expr *x, *y, *z;
 788
 789         x = compile_pattern_and(list);
 790         p = *list;
 791         if (x && p && p->token != GREP_CLOSE_PAREN) {
 792                 y = compile_pattern_or(list);
 793                 if (!y)
 794                         die("not a pattern expression %s", p->pattern);
 795                 z = xcalloc(1, sizeof (struct grep_expr));
 796                 z->node = GREP_NODE_OR;
 797                 z->u.binary.left = x;
 798                 z->u.binary.right = y;
 799                 return z;
 800         }
 801         return x;
 802 }
 803
 804 static struct grep_expr *compile_pattern_expr(struct grep_pat **list)
 805 {
 806         return compile_pattern_or(list);
 807 }
 808
 809 static void indent(int in)
 810 {
 811         while (in-- > 0)
 812                 fputc(' ', stderr);
 813 }
 814
 815 static void dump_grep_pat(struct grep_pat *p)
 816 {
 817         switch (p->token) {
 818         case GREP_AND: fprintf(stderr, "*and*"); break;
 819         case GREP_OPEN_PAREN: fprintf(stderr, "*(*"); break;
 820         case GREP_CLOSE_PAREN: fprintf(stderr, "*)*"); break;
 821         case GREP_NOT: fprintf(stderr, "*not*"); break;
 822         case GREP_OR: fprintf(stderr, "*or*"); break;
 823
 824         case GREP_PATTERN: fprintf(stderr, "pattern"); break;
 825         case GREP_PATTERN_HEAD: fprintf(stderr, "pattern_head"); break;
 826         case GREP_PATTERN_BODY: fprintf(stderr, "pattern_body"); break;
 827         }
 828
 829         switch (p->token) {
 830         default: break;
 831         case GREP_PATTERN_HEAD:
 832                 fprintf(stderr, "<head %d>", p->field); break;
 833         case GREP_PATTERN_BODY:
 834                 fprintf(stderr, "<body>"); break;
 835         }
 836         switch (p->token) {
 837         default: break;
 838         case GREP_PATTERN_HEAD:
 839         case GREP_PATTERN_BODY:
 840         case GREP_PATTERN:
 841                 fprintf(stderr, "%.*s", (int)p->patternlen, p->pattern);
 842                 break;
 843         }
 844         fputc('\n', stderr);
 845 }
 846
 847 static void dump_grep_expression_1(struct grep_expr *x, int in)
 848 {
 849         indent(in);
 850         switch (x->node) {
 851         case GREP_NODE_TRUE:
 852                 fprintf(stderr, "true\n");
 853                 break;
 854         case GREP_NODE_ATOM:
 855                 dump_grep_pat(x->u.atom);
 856                 break;
 857         case GREP_NODE_NOT:
 858                 fprintf(stderr, "(not\n");
 859                 dump_grep_expression_1(x->u.unary, in+1);
 860                 indent(in);
 861                 fprintf(stderr, ")\n");
 862                 break;
 863         case GREP_NODE_AND:
 864                 fprintf(stderr, "(and\n");
 865                 dump_grep_expression_1(x->u.binary.left, in+1);
 866                 dump_grep_expression_1(x->u.binary.right, in+1);
 867                 indent(in);
 868                 fprintf(stderr, ")\n");
 869                 break;
 870         case GREP_NODE_OR:
 871                 fprintf(stderr, "(or\n");
 872                 dump_grep_expression_1(x->u.binary.left, in+1);
 873                 dump_grep_expression_1(x->u.binary.right, in+1);
 874                 indent(in);
 875                 fprintf(stderr, ")\n");
 876                 break;
 877         }
 878 }
 879
 880 static void dump_grep_expression(struct grep_opt *opt)
 881 {
 882         struct grep_expr *x = opt->pattern_expression;
 883
 884         if (opt->all_match)
 885                 fprintf(stderr, "[all-match]\n");
 886         dump_grep_expression_1(x, 0);
 887         fflush(NULL);
 888 }
 889
 890 static struct grep_expr *grep_true_expr(void)
 891 {
 892         struct grep_expr *z = xcalloc(1, sizeof(*z));
 893         z->node = GREP_NODE_TRUE;
 894         return z;
 895 }
 896
 897 static struct grep_expr *grep_or_expr(struct grep_expr *left, struct grep_expr *right)
 898 {
 899         struct grep_expr *z = xcalloc(1, sizeof(*z));
 900         z->node = GREP_NODE_OR;
 901         z->u.binary.left = left;
 902         z->u.binary.right = right;
 903         return z;
 904 }
 905
 906 static struct grep_expr *prep_header_patterns(struct grep_opt *opt)
 907 {
 908         struct grep_pat *p;
 909         struct grep_expr *header_expr;
 910         struct grep_expr *(header_group[GREP_HEADER_FIELD_MAX]);
 911         enum grep_header_field fld;
 912
 913         if (!opt->header_list)
 914                 return NULL;
 915
 916         for (p = opt->header_list; p; p = p->next) {
 917                 if (p->token != GREP_PATTERN_HEAD)
 918                         BUG("a non-header pattern in grep header list.");
 919                 if (p->field < GREP_HEADER_FIELD_MIN ||
 920                     GREP_HEADER_FIELD_MAX <= p->field)
 921                         BUG("unknown header field %d", p->field);
 922                 compile_regexp(p, opt);
 923         }
 924
 925         for (fld = 0; fld < GREP_HEADER_FIELD_MAX; fld++)
 926                 header_group[fld] = NULL;
 927
 928         for (p = opt->header_list; p; p = p->next) {
 929                 struct grep_expr *h;
 930                 struct grep_pat *pp = p;
 931
 932                 h = compile_pattern_atom(&pp);
 933                 if (!h || pp != p->next)
 934                         BUG("malformed header expr");
 935                 if (!header_group[p->field]) {
 936                         header_group[p->field] = h;
 937                         continue;
 938                 }
 939                 header_group[p->field] = grep_or_expr(h, header_group[p->field]);
 940         }
 941
 942         header_expr = NULL;
 943
 944         for (fld = 0; fld < GREP_HEADER_FIELD_MAX; fld++) {
 945                 if (!header_group[fld])
 946                         continue;
 947                 if (!header_expr)
 948                         header_expr = grep_true_expr();
 949                 header_expr = grep_or_expr(header_group[fld], header_expr);
 950         }
 951         return header_expr;
 952 }
 953
 954 static struct grep_expr *grep_splice_or(struct grep_expr *x, struct grep_expr *y)
 955 {
 956         struct grep_expr *z = x;
 957
 958         while (x) {
 959                 assert(x->node == GREP_NODE_OR);
 960                 if (x->u.binary.right &&
 961                     x->u.binary.right->node == GREP_NODE_TRUE) {
 962                         x->u.binary.right = y;
 963                         break;
 964                 }
 965                 x = x->u.binary.right;
 966         }
 967         return z;
 968 }
 969
 970 static void compile_grep_patterns_real(struct grep_opt *opt)
 971 {
 972         struct grep_pat *p;
 973         struct grep_expr *header_expr = prep_header_patterns(opt);
 974
 975         for (p = opt->pattern_list; p; p = p->next) {
 976                 switch (p->token) {
 977                 case GREP_PATTERN: /* atom */
 978                 case GREP_PATTERN_HEAD:
 979                 case GREP_PATTERN_BODY:
 980                         compile_regexp(p, opt);
 981                         break;
 982                 default:
 983                         opt->extended = 1;
 984                         break;
 985                 }
 986         }
 987
 988         if (opt->all_match || header_expr)
 989                 opt->extended = 1;
 990         else if (!opt->extended && !opt->debug)
 991                 return;
 992
 993         p = opt->pattern_list;
 994         if (p)
 995                 opt->pattern_expression = compile_pattern_expr(&p);
 996         if (p)
 997                 die("incomplete pattern expression: %s", p->pattern);
 998
 999         if (!header_expr)
1000                 return;
1001
1002         if (!opt->pattern_expression)
1003                 opt->pattern_expression = header_expr;
1004         else if (opt->all_match)
1005                 opt->pattern_expression = grep_splice_or(header_expr,
1006                                                          opt->pattern_expression);
1007         else
1008                 opt->pattern_expression = grep_or_expr(opt->pattern_expression,
1009                                                        header_expr);
1010         opt->all_match = 1;
1011 }
1012
1013 void compile_grep_patterns(struct grep_opt *opt)
1014 {
1015         compile_grep_patterns_real(opt);
1016         if (opt->debug)
1017                 dump_grep_expression(opt);
1018 }
1019
1020 static void free_pattern_expr(struct grep_expr *x)
1021 {
1022         switch (x->node) {
1023         case GREP_NODE_TRUE:
1024         case GREP_NODE_ATOM:
1025                 break;
1026         case GREP_NODE_NOT:
1027                 free_pattern_expr(x->u.unary);
1028                 break;
1029         case GREP_NODE_AND:
1030         case GREP_NODE_OR:
1031                 free_pattern_expr(x->u.binary.left);
1032                 free_pattern_expr(x->u.binary.right);
1033                 break;
1034         }
1035         free(x);
1036 }
1037
1038 void free_grep_patterns(struct grep_opt *opt)
1039 {
1040         struct grep_pat *p, *n;
1041
1042         for (p = opt->pattern_list; p; p = n) {
1043                 n = p->next;
1044                 switch (p->token) {
1045                 case GREP_PATTERN: /* atom */
1046                 case GREP_PATTERN_HEAD:
1047                 case GREP_PATTERN_BODY:
1048                         if (p->kws)
1049                                 kwsfree(p->kws);
1050                         else if (p->pcre1_regexp)
1051                                 free_pcre1_regexp(p);
1052                         else if (p->pcre2_pattern)
1053                                 free_pcre2_pattern(p);
1054                         else
1055                                 regfree(&p->regexp);
1056                         free(p->pattern);
1057                         break;
1058                 default:
1059                         break;
1060                 }
1061                 free(p);
1062         }
1063
1064         if (!opt->extended)
1065                 return;
1066         free_pattern_expr(opt->pattern_expression);
1067 }
1068
1069 static char *end_of_line(char *cp, unsigned long *left)
1070 {
1071         unsigned long l = *left;
1072         while (l && *cp != '\n') {
1073                 l--;
1074                 cp++;
1075         }
1076         *left = l;
1077         return cp;
1078 }
1079
1080 static int word_char(char ch)
1081 {
1082         return isalnum(ch) || ch == '_';
1083 }
1084
1085 static void output_color(struct grep_opt *opt, const void *data, size_t size,
1086                          const char *color)
1087 {
1088         if (want_color(opt->color) && color && color[0]) {
1089                 opt->output(opt, color, strlen(color));
1090                 opt->output(opt, data, size);
1091                 opt->output(opt, GIT_COLOR_RESET, strlen(GIT_COLOR_RESET));
1092         } else
1093                 opt->output(opt, data, size);
1094 }
1095
1096 static void output_sep(struct grep_opt *opt, char sign)
1097 {
1098         if (opt->null_following_name)
1099                 opt->output(opt, "\0", 1);
1100         else
1101                 output_color(opt, &sign, 1, opt->color_sep);
1102 }
1103
1104 static void show_name(struct grep_opt *opt, const char *name)
1105 {
1106         output_color(opt, name, strlen(name), opt->color_filename);
1107         opt->output(opt, opt->null_following_name ? "\0" : "\n", 1);
1108 }
1109
1110 static int fixmatch(struct grep_pat *p, char *line, char *eol,
1111                     regmatch_t *match)
1112 {
1113         struct kwsmatch kwsm;
1114         size_t offset = kwsexec(p->kws, line, eol - line, &kwsm);
1115         if (offset == -1) {
1116                 match->rm_so = match->rm_eo = -1;
1117                 return REG_NOMATCH;
1118         } else {
1119                 match->rm_so = offset;
1120                 match->rm_eo = match->rm_so + kwsm.size[0];
1121                 return 0;
1122         }
1123 }
1124
1125 static int patmatch(struct grep_pat *p, char *line, char *eol,
1126                     regmatch_t *match, int eflags)
1127 {
1128         int hit;
1129
1130         if (p->fixed)
1131                 hit = !fixmatch(p, line, eol, match);
1132         else if (p->pcre1_regexp)
1133                 hit = !pcre1match(p, line, eol, match, eflags);
1134         else if (p->pcre2_pattern)
1135                 hit = !pcre2match(p, line, eol, match, eflags);
1136         else
1137                 hit = !regexec_buf(&p->regexp, line, eol - line, 1, match,
1138                                    eflags);
1139
1140         return hit;
1141 }
1142
1143 static int strip_timestamp(char *bol, char **eol_p)
1144 {
1145         char *eol = *eol_p;
1146         int ch;
1147
1148         while (bol < --eol) {
1149                 if (*eol != '>')
1150                         continue;
1151                 *eol_p = ++eol;
1152                 ch = *eol;
1153                 *eol = '\0';
1154                 return ch;
1155         }
1156         return 0;
1157 }
1158
1159 static struct {
1160         const char *field;
1161         size_t len;
1162 } header_field[] = {
1163         { "author ", 7 },
1164         { "committer ", 10 },
1165         { "reflog ", 7 },
1166 };
1167
1168 static int match_one_pattern(struct grep_pat *p, char *bol, char *eol,
1169                              enum grep_context ctx,
1170                              regmatch_t *pmatch, int eflags)
1171 {
1172         int hit = 0;
1173         int saved_ch = 0;
1174         const char *start = bol;
1175
1176         if ((p->token != GREP_PATTERN) &&
1177             ((p->token == GREP_PATTERN_HEAD) != (ctx == GREP_CONTEXT_HEAD)))
1178                 return 0;
1179
1180         if (p->token == GREP_PATTERN_HEAD) {
1181                 const char *field;
1182                 size_t len;
1183                 assert(p->field < ARRAY_SIZE(header_field));
1184                 field = header_field[p->field].field;
1185                 len = header_field[p->field].len;
1186                 if (strncmp(bol, field, len))
1187                         return 0;
1188                 bol += len;
1189                 switch (p->field) {
1190                 case GREP_HEADER_AUTHOR:
1191                 case GREP_HEADER_COMMITTER:
1192                         saved_ch = strip_timestamp(bol, &eol);
1193                         break;
1194                 default:
1195                         break;
1196                 }
1197         }
1198
1199  again:
1200         hit = patmatch(p, bol, eol, pmatch, eflags);
1201
1202         if (hit && p->word_regexp) {
1203                 if ((pmatch[0].rm_so < 0) ||
1204                     (eol - bol) < pmatch[0].rm_so ||
1205                     (pmatch[0].rm_eo < 0) ||
1206                     (eol - bol) < pmatch[0].rm_eo)
1207                         die("regexp returned nonsense");
1208
1209                 /* Match beginning must be either beginning of the
1210                  * line, or at word boundary (i.e. the last char must
1211                  * not be a word char).  Similarly, match end must be
1212                  * either end of the line, or at word boundary
1213                  * (i.e. the next char must not be a word char).
1214                  */
1215                 if ( ((pmatch[0].rm_so == 0) ||
1216                       !word_char(bol[pmatch[0].rm_so-1])) &&
1217                      ((pmatch[0].rm_eo == (eol-bol)) ||
1218                       !word_char(bol[pmatch[0].rm_eo])) )
1219                         ;
1220                 else
1221                         hit = 0;
1222
1223                 /* Words consist of at least one character. */
1224                 if (pmatch->rm_so == pmatch->rm_eo)
1225                         hit = 0;
1226
1227                 if (!hit && pmatch[0].rm_so + bol + 1 < eol) {
1228                         /* There could be more than one match on the
1229                          * line, and the first match might not be
1230                          * strict word match.  But later ones could be!
1231                          * Forward to the next possible start, i.e. the
1232                          * next position following a non-word char.
1233                          */
1234                         bol = pmatch[0].rm_so + bol + 1;
1235                         while (word_char(bol[-1]) && bol < eol)
1236                                 bol++;
1237                         eflags |= REG_NOTBOL;
1238                         if (bol < eol)
1239                                 goto again;
1240                 }
1241         }
1242         if (p->token == GREP_PATTERN_HEAD && saved_ch)
1243                 *eol = saved_ch;
1244         if (hit) {
1245                 pmatch[0].rm_so += bol - start;
1246                 pmatch[0].rm_eo += bol - start;
1247         }
1248         return hit;
1249 }
1250
1251 static int match_expr_eval(struct grep_expr *x, char *bol, char *eol,
1252                            enum grep_context ctx, int collect_hits)
1253 {
1254         int h = 0;
1255         regmatch_t match;
1256
1257         if (!x)
1258                 die("Not a valid grep expression");
1259         switch (x->node) {
1260         case GREP_NODE_TRUE:
1261                 h = 1;
1262                 break;
1263         case GREP_NODE_ATOM:
1264                 h = match_one_pattern(x->u.atom, bol, eol, ctx, &match, 0);
1265                 break;
1266         case GREP_NODE_NOT:
1267                 h = !match_expr_eval(x->u.unary, bol, eol, ctx, 0);
1268                 break;
1269         case GREP_NODE_AND:
1270                 if (!match_expr_eval(x->u.binary.left, bol, eol, ctx, 0))
1271                         return 0;
1272                 h = match_expr_eval(x->u.binary.right, bol, eol, ctx, 0);
1273                 break;
1274         case GREP_NODE_OR:
1275                 if (!collect_hits)
1276                         return (match_expr_eval(x->u.binary.left,
1277                                                 bol, eol, ctx, 0) ||
1278                                 match_expr_eval(x->u.binary.right,
1279                                                 bol, eol, ctx, 0));
1280                 h = match_expr_eval(x->u.binary.left, bol, eol, ctx, 0);
1281                 x->u.binary.left->hit |= h;
1282                 h |= match_expr_eval(x->u.binary.right, bol, eol, ctx, 1);
1283                 break;
1284         default:
1285                 die("Unexpected node type (internal error) %d", x->node);
1286         }
1287         if (collect_hits)
1288                 x->hit |= h;
1289         return h;
1290 }
1291
1292 static int match_expr(struct grep_opt *opt, char *bol, char *eol,
1293                       enum grep_context ctx, int collect_hits)
1294 {
1295         struct grep_expr *x = opt->pattern_expression;
1296         return match_expr_eval(x, bol, eol, ctx, collect_hits);
1297 }
1298
1299 static int match_line(struct grep_opt *opt, char *bol, char *eol,
1300                       enum grep_context ctx, int collect_hits)
1301 {
1302         struct grep_pat *p;
1303         regmatch_t match;
1304
1305         if (opt->extended)
1306                 return match_expr(opt, bol, eol, ctx, collect_hits);
1307
1308         /* we do not call with collect_hits without being extended */
1309         for (p = opt->pattern_list; p; p = p->next) {
1310                 if (match_one_pattern(p, bol, eol, ctx, &match, 0))
1311                         return 1;
1312         }
1313         return 0;
1314 }
1315
1316 static int match_next_pattern(struct grep_pat *p, char *bol, char *eol,
1317                               enum grep_context ctx,
1318                               regmatch_t *pmatch, int eflags)
1319 {
1320         regmatch_t match;
1321
1322         if (!match_one_pattern(p, bol, eol, ctx, &match, eflags))
1323                 return 0;
1324         if (match.rm_so < 0 || match.rm_eo < 0)
1325                 return 0;
1326         if (pmatch->rm_so >= 0 && pmatch->rm_eo >= 0) {
1327                 if (match.rm_so > pmatch->rm_so)
1328                         return 1;
1329                 if (match.rm_so == pmatch->rm_so && match.rm_eo < pmatch->rm_eo)
1330                         return 1;
1331         }
1332         pmatch->rm_so = match.rm_so;
1333         pmatch->rm_eo = match.rm_eo;
1334         return 1;
1335 }
1336
1337 static int next_match(struct grep_opt *opt, char *bol, char *eol,
1338                       enum grep_context ctx, regmatch_t *pmatch, int eflags)
1339 {
1340         struct grep_pat *p;
1341         int hit = 0;
1342
1343         pmatch->rm_so = pmatch->rm_eo = -1;
1344         if (bol < eol) {
1345                 for (p = opt->pattern_list; p; p = p->next) {
1346                         switch (p->token) {
1347                         case GREP_PATTERN: /* atom */
1348                         case GREP_PATTERN_HEAD:
1349                         case GREP_PATTERN_BODY:
1350                                 hit |= match_next_pattern(p, bol, eol, ctx,
1351                                                           pmatch, eflags);
1352                                 break;
1353                         default:
1354                                 break;
1355                         }
1356                 }
1357         }
1358         return hit;
1359 }
1360
1361 static void show_line(struct grep_opt *opt, char *bol, char *eol,
1362                       const char *name, unsigned lno, char sign)
1363 {
1364         int rest = eol - bol;
1365         const char *match_color, *line_color = NULL;
1366
1367         if (opt->file_break && opt->last_shown == 0) {
1368                 if (opt->show_hunk_mark)
1369                         opt->output(opt, "\n", 1);
1370         } else if (opt->pre_context || opt->post_context || opt->funcbody) {
1371                 if (opt->last_shown == 0) {
1372                         if (opt->show_hunk_mark) {
1373                                 output_color(opt, "--", 2, opt->color_sep);
1374                                 opt->output(opt, "\n", 1);
1375                         }
1376                 } else if (lno > opt->last_shown + 1) {
1377                         output_color(opt, "--", 2, opt->color_sep);
1378                         opt->output(opt, "\n", 1);
1379                 }
1380         }
1381         if (opt->heading && opt->last_shown == 0) {
1382                 output_color(opt, name, strlen(name), opt->color_filename);
1383                 opt->output(opt, "\n", 1);
1384         }
1385         opt->last_shown = lno;
1386
1387         if (!opt->heading && opt->pathname) {
1388                 output_color(opt, name, strlen(name), opt->color_filename);
1389                 output_sep(opt, sign);
1390         }
1391         if (opt->linenum) {
1392                 char buf[32];
1393                 xsnprintf(buf, sizeof(buf), "%d", lno);
1394                 output_color(opt, buf, strlen(buf), opt->color_lineno);
1395                 output_sep(opt, sign);
1396         }
1397         if (opt->color) {
1398                 regmatch_t match;
1399                 enum grep_context ctx = GREP_CONTEXT_BODY;
1400                 int ch = *eol;
1401                 int eflags = 0;
1402
1403                 if (sign == ':')
1404                         match_color = opt->color_match_selected;
1405                 else
1406                         match_color = opt->color_match_context;
1407                 if (sign == ':')
1408                         line_color = opt->color_selected;
1409                 else if (sign == '-')
1410                         line_color = opt->color_context;
1411                 else if (sign == '=')
1412                         line_color = opt->color_function;
1413                 *eol = '\0';
1414                 while (next_match(opt, bol, eol, ctx, &match, eflags)) {
1415                         if (match.rm_so == match.rm_eo)
1416                                 break;
1417
1418                         output_color(opt, bol, match.rm_so, line_color);
1419                         output_color(opt, bol + match.rm_so,
1420                                      match.rm_eo - match.rm_so, match_color);
1421                         bol += match.rm_eo;
1422                         rest -= match.rm_eo;
1423                         eflags = REG_NOTBOL;
1424                 }
1425                 *eol = ch;
1426         }
1427         output_color(opt, bol, rest, line_color);
1428         opt->output(opt, "\n", 1);
1429 }
1430
1431 #ifndef NO_PTHREADS
1432 int grep_use_locks;
1433
1434 /*
1435  * This lock protects access to the gitattributes machinery, which is
1436  * not thread-safe.
1437  */
1438 pthread_mutex_t grep_attr_mutex;
1439
1440 static inline void grep_attr_lock(void)
1441 {
1442         if (grep_use_locks)
1443                 pthread_mutex_lock(&grep_attr_mutex);
1444 }
1445
1446 static inline void grep_attr_unlock(void)
1447 {
1448         if (grep_use_locks)
1449                 pthread_mutex_unlock(&grep_attr_mutex);
1450 }
1451
1452 /*
1453  * Same as git_attr_mutex, but protecting the thread-unsafe object db access.
1454  */
1455 pthread_mutex_t grep_read_mutex;
1456
1457 #else
1458 #define grep_attr_lock()
1459 #define grep_attr_unlock()
1460 #endif
1461
1462 static int match_funcname(struct grep_opt *opt, struct grep_source *gs, char *bol, char *eol)
1463 {
1464         xdemitconf_t *xecfg = opt->priv;
1465         if (xecfg && !xecfg->find_func) {
1466                 grep_source_load_driver(gs);
1467                 if (gs->driver->funcname.pattern) {
1468                         const struct userdiff_funcname *pe = &gs->driver->funcname;
1469                         xdiff_set_find_func(xecfg, pe->pattern, pe->cflags);
1470                 } else {
1471                         xecfg = opt->priv = NULL;
1472                 }
1473         }
1474
1475         if (xecfg) {
1476                 char buf[1];
1477                 return xecfg->find_func(bol, eol - bol, buf, 1,
1478                                         xecfg->find_func_priv) >= 0;
1479         }
1480
1481         if (bol == eol)
1482                 return 0;
1483         if (isalpha(*bol) || *bol == '_' || *bol == '$')
1484                 return 1;
1485         return 0;
1486 }
1487
1488 static void show_funcname_line(struct grep_opt *opt, struct grep_source *gs,
1489                                char *bol, unsigned lno)
1490 {
1491         while (bol > gs->buf) {
1492                 char *eol = --bol;
1493
1494                 while (bol > gs->buf && bol[-1] != '\n')
1495                         bol--;
1496                 lno--;
1497
1498                 if (lno <= opt->last_shown)
1499                         break;
1500
1501                 if (match_funcname(opt, gs, bol, eol)) {
1502                         show_line(opt, bol, eol, gs->name, lno, '=');
1503                         break;
1504                 }
1505         }
1506 }
1507
1508 static int is_empty_line(const char *bol, const char *eol);
1509
1510 static void show_pre_context(struct grep_opt *opt, struct grep_source *gs,
1511                              char *bol, char *end, unsigned lno)
1512 {
1513         unsigned cur = lno, from = 1, funcname_lno = 0, orig_from;
1514         int funcname_needed = !!opt->funcname, comment_needed = 0;
1515
1516         if (opt->pre_context < lno)
1517                 from = lno - opt->pre_context;
1518         if (from <= opt->last_shown)
1519                 from = opt->last_shown + 1;
1520         orig_from = from;
1521         if (opt->funcbody) {
1522                 if (match_funcname(opt, gs, bol, end))
1523                         comment_needed = 1;
1524                 else
1525                         funcname_needed = 1;
1526                 from = opt->last_shown + 1;
1527         }
1528
1529         /* Rewind. */
1530         while (bol > gs->buf && cur > from) {
1531                 char *next_bol = bol;
1532                 char *eol = --bol;
1533
1534                 while (bol > gs->buf && bol[-1] != '\n')
1535                         bol--;
1536                 cur--;
1537                 if (comment_needed && (is_empty_line(bol, eol) ||
1538                                        match_funcname(opt, gs, bol, eol))) {
1539                         comment_needed = 0;
1540                         from = orig_from;
1541                         if (cur < from) {
1542                                 cur++;
1543                                 bol = next_bol;
1544                                 break;
1545                         }
1546                 }
1547                 if (funcname_needed && match_funcname(opt, gs, bol, eol)) {
1548                         funcname_lno = cur;
1549                         funcname_needed = 0;
1550                         if (opt->funcbody)
1551                                 comment_needed = 1;
1552                         else
1553                                 from = orig_from;
1554                 }
1555         }
1556
1557         /* We need to look even further back to find a function signature. */
1558         if (opt->funcname && funcname_needed)
1559                 show_funcname_line(opt, gs, bol, cur);
1560
1561         /* Back forward. */
1562         while (cur < lno) {
1563                 char *eol = bol, sign = (cur == funcname_lno) ? '=' : '-';
1564
1565                 while (*eol != '\n')
1566                         eol++;
1567                 show_line(opt, bol, eol, gs->name, cur, sign);
1568                 bol = eol + 1;
1569                 cur++;
1570         }
1571 }
1572
1573 static int should_lookahead(struct grep_opt *opt)
1574 {
1575         struct grep_pat *p;
1576
1577         if (opt->extended)
1578                 return 0; /* punt for too complex stuff */
1579         if (opt->invert)
1580                 return 0;
1581         for (p = opt->pattern_list; p; p = p->next) {
1582                 if (p->token != GREP_PATTERN)
1583                         return 0; /* punt for "header only" and stuff */
1584         }
1585         return 1;
1586 }
1587
1588 static int look_ahead(struct grep_opt *opt,
1589                       unsigned long *left_p,
1590                       unsigned *lno_p,
1591                       char **bol_p)
1592 {
1593         unsigned lno = *lno_p;
1594         char *bol = *bol_p;
1595         struct grep_pat *p;
1596         char *sp, *last_bol;
1597         regoff_t earliest = -1;
1598
1599         for (p = opt->pattern_list; p; p = p->next) {
1600                 int hit;
1601                 regmatch_t m;
1602
1603                 hit = patmatch(p, bol, bol + *left_p, &m, 0);
1604                 if (!hit || m.rm_so < 0 || m.rm_eo < 0)
1605                         continue;
1606                 if (earliest < 0 || m.rm_so < earliest)
1607                         earliest = m.rm_so;
1608         }
1609
1610         if (earliest < 0) {
1611                 *bol_p = bol + *left_p;
1612                 *left_p = 0;
1613                 return 1;
1614         }
1615         for (sp = bol + earliest; bol < sp && sp[-1] != '\n'; sp--)
1616                 ; /* find the beginning of the line */
1617         last_bol = sp;
1618
1619         for (sp = bol; sp < last_bol; sp++) {
1620                 if (*sp == '\n')
1621                         lno++;
1622         }
1623         *left_p -= last_bol - bol;
1624         *bol_p = last_bol;
1625         *lno_p = lno;
1626         return 0;
1627 }
1628
1629 static int fill_textconv_grep(struct userdiff_driver *driver,
1630                               struct grep_source *gs)
1631 {
1632         struct diff_filespec *df;
1633         char *buf;
1634         size_t size;
1635
1636         if (!driver || !driver->textconv)
1637                 return grep_source_load(gs);
1638
1639         /*
1640          * The textconv interface is intimately tied to diff_filespecs, so we
1641          * have to pretend to be one. If we could unify the grep_source
1642          * and diff_filespec structs, this mess could just go away.
1643          */
1644         df = alloc_filespec(gs->path);
1645         switch (gs->type) {
1646         case GREP_SOURCE_OID:
1647                 fill_filespec(df, gs->identifier, 1, 0100644);
1648                 break;
1649         case GREP_SOURCE_FILE:
1650                 fill_filespec(df, &null_oid, 0, 0100644);
1651                 break;
1652         default:
1653                 BUG("attempt to textconv something without a path?");
1654         }
1655
1656         /*
1657          * fill_textconv is not remotely thread-safe; it may load objects
1658          * behind the scenes, and it modifies the global diff tempfile
1659          * structure.
1660          */
1661         grep_read_lock();
1662         size = fill_textconv(driver, df, &buf);
1663         grep_read_unlock();
1664         free_filespec(df);
1665
1666         /*
1667          * The normal fill_textconv usage by the diff machinery would just keep
1668          * the textconv'd buf separate from the diff_filespec. But much of the
1669          * grep code passes around a grep_source and assumes that its "buf"
1670          * pointer is the beginning of the thing we are searching. So let's
1671          * install our textconv'd version into the grep_source, taking care not
1672          * to leak any existing buffer.
1673          */
1674         grep_source_clear_data(gs);
1675         gs->buf = buf;
1676         gs->size = size;
1677
1678         return 0;
1679 }
1680
1681 static int is_empty_line(const char *bol, const char *eol)
1682 {
1683         while (bol < eol && isspace(*bol))
1684                 bol++;
1685         return bol == eol;
1686 }
1687
1688 static int grep_source_1(struct grep_opt *opt, struct grep_source *gs, int collect_hits)
1689 {
1690         char *bol;
1691         char *peek_bol = NULL;
1692         unsigned long left;
1693         unsigned lno = 1;
1694         unsigned last_hit = 0;
1695         int binary_match_only = 0;
1696         unsigned count = 0;
1697         int try_lookahead = 0;
1698         int show_function = 0;
1699         struct userdiff_driver *textconv = NULL;
1700         enum grep_context ctx = GREP_CONTEXT_HEAD;
1701         xdemitconf_t xecfg;
1702
1703         if (!opt->output)
1704                 opt->output = std_output;
1705
1706         if (opt->pre_context || opt->post_context || opt->file_break ||
1707             opt->funcbody) {
1708                 /* Show hunk marks, except for the first file. */
1709                 if (opt->last_shown)
1710                         opt->show_hunk_mark = 1;
1711                 /*
1712                  * If we're using threads then we can't easily identify
1713                  * the first file.  Always put hunk marks in that case
1714                  * and skip the very first one later in work_done().
1715                  */
1716                 if (opt->output != std_output)
1717                         opt->show_hunk_mark = 1;
1718         }
1719         opt->last_shown = 0;
1720
1721         if (opt->allow_textconv) {
1722                 grep_source_load_driver(gs);
1723                 /*
1724                  * We might set up the shared textconv cache data here, which
1725                  * is not thread-safe.
1726                  */
1727                 grep_attr_lock();
1728                 textconv = userdiff_get_textconv(gs->driver);
1729                 grep_attr_unlock();
1730         }
1731
1732         /*
1733          * We know the result of a textconv is text, so we only have to care
1734          * about binary handling if we are not using it.
1735          */
1736         if (!textconv) {
1737                 switch (opt->binary) {
1738                 case GREP_BINARY_DEFAULT:
1739                         if (grep_source_is_binary(gs))
1740                                 binary_match_only = 1;
1741                         break;
1742                 case GREP_BINARY_NOMATCH:
1743                         if (grep_source_is_binary(gs))
1744                                 return 0; /* Assume unmatch */
1745                         break;
1746                 case GREP_BINARY_TEXT:
1747                         break;
1748                 default:
1749                         BUG("unknown binary handling mode");
1750                 }
1751         }
1752
1753         memset(&xecfg, 0, sizeof(xecfg));
1754         opt->priv = &xecfg;
1755
1756         try_lookahead = should_lookahead(opt);
1757
1758         if (fill_textconv_grep(textconv, gs) < 0)
1759                 return 0;
1760
1761         bol = gs->buf;
1762         left = gs->size;
1763         while (left) {
1764                 char *eol, ch;
1765                 int hit;
1766
1767                 /*
1768                  * look_ahead() skips quickly to the line that possibly
1769                  * has the next hit; don't call it if we need to do
1770                  * something more than just skipping the current line
1771                  * in response to an unmatch for the current line.  E.g.
1772                  * inside a post-context window, we will show the current
1773                  * line as a context around the previous hit when it
1774                  * doesn't hit.
1775                  */
1776                 if (try_lookahead
1777                     && !(last_hit
1778                          && (show_function ||
1779                              lno <= last_hit + opt->post_context))
1780                     && look_ahead(opt, &left, &lno, &bol))
1781                         break;
1782                 eol = end_of_line(bol, &left);
1783                 ch = *eol;
1784                 *eol = 0;
1785
1786                 if ((ctx == GREP_CONTEXT_HEAD) && (eol == bol))
1787                         ctx = GREP_CONTEXT_BODY;
1788
1789                 hit = match_line(opt, bol, eol, ctx, collect_hits);
1790                 *eol = ch;
1791
1792                 if (collect_hits)
1793                         goto next_line;
1794
1795                 /* "grep -v -e foo -e bla" should list lines
1796                  * that do not have either, so inversion should
1797                  * be done outside.
1798                  */
1799                 if (opt->invert)
1800                         hit = !hit;
1801                 if (opt->unmatch_name_only) {
1802                         if (hit)
1803                                 return 0;
1804                         goto next_line;
1805                 }
1806                 if (hit) {
1807                         count++;
1808                         if (opt->status_only)
1809                                 return 1;
1810                         if (opt->name_only) {
1811                                 show_name(opt, gs->name);
1812                                 return 1;
1813                         }
1814                         if (opt->count)
1815                                 goto next_line;
1816                         if (binary_match_only) {
1817                                 opt->output(opt, "Binary file ", 12);
1818                                 output_color(opt, gs->name, strlen(gs->name),
1819                                              opt->color_filename);
1820                                 opt->output(opt, " matches\n", 9);
1821                                 return 1;
1822                         }
1823                         /* Hit at this line.  If we haven't shown the
1824                          * pre-context lines, we would need to show them.
1825                          */
1826                         if (opt->pre_context || opt->funcbody)
1827                                 show_pre_context(opt, gs, bol, eol, lno);
1828                         else if (opt->funcname)
1829                                 show_funcname_line(opt, gs, bol, lno);
1830                         show_line(opt, bol, eol, gs->name, lno, ':');
1831                         last_hit = lno;
1832                         if (opt->funcbody)
1833                                 show_function = 1;
1834                         goto next_line;
1835                 }
1836                 if (show_function && (!peek_bol || peek_bol < bol)) {
1837                         unsigned long peek_left = left;
1838                         char *peek_eol = eol;
1839
1840                         /*
1841                          * Trailing empty lines are not interesting.
1842                          * Peek past them to see if they belong to the
1843                          * body of the current function.
1844                          */
1845                         peek_bol = bol;
1846                         while (is_empty_line(peek_bol, peek_eol)) {
1847                                 peek_bol = peek_eol + 1;
1848                                 peek_eol = end_of_line(peek_bol, &peek_left);
1849                         }
1850
1851                         if (match_funcname(opt, gs, peek_bol, peek_eol))
1852                                 show_function = 0;
1853                 }
1854                 if (show_function ||
1855                     (last_hit && lno <= last_hit + opt->post_context)) {
1856                         /* If the last hit is within the post context,
1857                          * we need to show this line.
1858                          */
1859                         show_line(opt, bol, eol, gs->name, lno, '-');
1860                 }
1861
1862         next_line:
1863                 bol = eol + 1;
1864                 if (!left)
1865                         break;
1866                 left--;
1867                 lno++;
1868         }
1869
1870         if (collect_hits)
1871                 return 0;
1872
1873         if (opt->status_only)
1874                 return opt->unmatch_name_only;
1875         if (opt->unmatch_name_only) {
1876                 /* We did not see any hit, so we want to show this */
1877                 show_name(opt, gs->name);
1878                 return 1;
1879         }
1880
1881         xdiff_clear_find_func(&xecfg);
1882         opt->priv = NULL;
1883
1884         /* NEEDSWORK:
1885          * The real "grep -c foo *.c" gives many "bar.c:0" lines,
1886          * which feels mostly useless but sometimes useful.  Maybe
1887          * make it another option?  For now suppress them.
1888          */
1889         if (opt->count && count) {
1890                 char buf[32];
1891                 if (opt->pathname) {
1892                         output_color(opt, gs->name, strlen(gs->name),
1893                                      opt->color_filename);
1894                         output_sep(opt, ':');
1895                 }
1896                 xsnprintf(buf, sizeof(buf), "%u\n", count);
1897                 opt->output(opt, buf, strlen(buf));
1898                 return 1;
1899         }
1900         return !!last_hit;
1901 }
1902
1903 static void clr_hit_marker(struct grep_expr *x)
1904 {
1905         /* All-hit markers are meaningful only at the very top level
1906          * OR node.
1907          */
1908         while (1) {
1909                 x->hit = 0;
1910                 if (x->node != GREP_NODE_OR)
1911                         return;
1912                 x->u.binary.left->hit = 0;
1913                 x = x->u.binary.right;
1914         }
1915 }
1916
1917 static int chk_hit_marker(struct grep_expr *x)
1918 {
1919         /* Top level nodes have hit markers.  See if they all are hits */
1920         while (1) {
1921                 if (x->node != GREP_NODE_OR)
1922                         return x->hit;
1923                 if (!x->u.binary.left->hit)
1924                         return 0;
1925                 x = x->u.binary.right;
1926         }
1927 }
1928
1929 int grep_source(struct grep_opt *opt, struct grep_source *gs)
1930 {
1931         /*
1932          * we do not have to do the two-pass grep when we do not check
1933          * buffer-wide "all-match".
1934          */
1935         if (!opt->all_match)
1936                 return grep_source_1(opt, gs, 0);
1937
1938         /* Otherwise the toplevel "or" terms hit a bit differently.
1939          * We first clear hit markers from them.
1940          */
1941         clr_hit_marker(opt->pattern_expression);
1942         grep_source_1(opt, gs, 1);
1943
1944         if (!chk_hit_marker(opt->pattern_expression))
1945                 return 0;
1946
1947         return grep_source_1(opt, gs, 0);
1948 }
1949
1950 int grep_buffer(struct grep_opt *opt, char *buf, unsigned long size)
1951 {
1952         struct grep_source gs;
1953         int r;
1954
1955         grep_source_init(&gs, GREP_SOURCE_BUF, NULL, NULL, NULL);
1956         gs.buf = buf;
1957         gs.size = size;
1958
1959         r = grep_source(opt, &gs);
1960
1961         grep_source_clear(&gs);
1962         return r;
1963 }
1964
1965 void grep_source_init(struct grep_source *gs, enum grep_source_type type,
1966                       const char *name, const char *path,
1967                       const void *identifier)
1968 {
1969         gs->type = type;
1970         gs->name = xstrdup_or_null(name);
1971         gs->path = xstrdup_or_null(path);
1972         gs->buf = NULL;
1973         gs->size = 0;
1974         gs->driver = NULL;
1975
1976         switch (type) {
1977         case GREP_SOURCE_FILE:
1978                 gs->identifier = xstrdup(identifier);
1979                 break;
1980         case GREP_SOURCE_OID:
1981                 gs->identifier = oiddup(identifier);
1982                 break;
1983         case GREP_SOURCE_BUF:
1984                 gs->identifier = NULL;
1985                 break;
1986         }
1987 }
1988
1989 void grep_source_clear(struct grep_source *gs)
1990 {
1991         FREE_AND_NULL(gs->name);
1992         FREE_AND_NULL(gs->path);
1993         FREE_AND_NULL(gs->identifier);
1994         grep_source_clear_data(gs);
1995 }
1996
1997 void grep_source_clear_data(struct grep_source *gs)
1998 {
1999         switch (gs->type) {
2000         case GREP_SOURCE_FILE:
2001         case GREP_SOURCE_OID:
2002                 FREE_AND_NULL(gs->buf);
2003                 gs->size = 0;
2004                 break;
2005         case GREP_SOURCE_BUF:
2006                 /* leave user-provided buf intact */
2007                 break;
2008         }
2009 }
2010
2011 static int grep_source_load_oid(struct grep_source *gs)
2012 {
2013         enum object_type type;
2014
2015         grep_read_lock();
2016         gs->buf = read_object_file(gs->identifier, &type, &gs->size);
2017         grep_read_unlock();
2018
2019         if (!gs->buf)
2020                 return error(_("'%s': unable to read %s"),
2021                              gs->name,
2022                              oid_to_hex(gs->identifier));
2023         return 0;
2024 }
2025
2026 static int grep_source_load_file(struct grep_source *gs)
2027 {
2028         const char *filename = gs->identifier;
2029         struct stat st;
2030         char *data;
2031         size_t size;
2032         int i;
2033
2034         if (lstat(filename, &st) < 0) {
2035         err_ret:
2036                 if (errno != ENOENT)
2037                         error_errno(_("failed to stat '%s'"), filename);
2038                 return -1;
2039         }
2040         if (!S_ISREG(st.st_mode))
2041                 return -1;
2042         size = xsize_t(st.st_size);
2043         i = open(filename, O_RDONLY);
2044         if (i < 0)
2045                 goto err_ret;
2046         data = xmallocz(size);
2047         if (st.st_size != read_in_full(i, data, size)) {
2048                 error_errno(_("'%s': short read"), filename);
2049                 close(i);
2050                 free(data);
2051                 return -1;
2052         }
2053         close(i);
2054
2055         gs->buf = data;
2056         gs->size = size;
2057         return 0;
2058 }
2059
2060 static int grep_source_load(struct grep_source *gs)
2061 {
2062         if (gs->buf)
2063                 return 0;
2064
2065         switch (gs->type) {
2066         case GREP_SOURCE_FILE:
2067                 return grep_source_load_file(gs);
2068         case GREP_SOURCE_OID:
2069                 return grep_source_load_oid(gs);
2070         case GREP_SOURCE_BUF:
2071                 return gs->buf ? 0 : -1;
2072         }
2073         BUG("invalid grep_source type to load");
2074 }
2075
2076 void grep_source_load_driver(struct grep_source *gs)
2077 {
2078         if (gs->driver)
2079                 return;
2080
2081         grep_attr_lock();
2082         if (gs->path)
2083                 gs->driver = userdiff_find_by_path(gs->path);
2084         if (!gs->driver)
2085                 gs->driver = userdiff_find_by_name("default");
2086         grep_attr_unlock();
2087 }
2088
2089 static int grep_source_is_binary(struct grep_source *gs)
2090 {
2091         grep_source_load_driver(gs);
2092         if (gs->driver->binary != -1)
2093                 return gs->driver->binary;
2094
2095         if (!grep_source_load(gs))
2096                 return buffer_is_binary(gs->buf, gs->size);
2097
2098         return 0;
2099 }