Andrew's git / gitweb.git / grep.c
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grep.con commit Merge branch 'lt/mailinfo-handle-attachment-more-sanely' into maint (6e20357)
   1#include "cache.h"
   2#include "grep.h"
   3#include "userdiff.h"
   4#include "xdiff-interface.h"
   5
   6static int grep_source_load(struct grep_source *gs);
   7static int grep_source_is_binary(struct grep_source *gs);
   8
   9
  10static struct grep_pat *create_grep_pat(const char *pat, size_t patlen,
  11                                        const char *origin, int no,
  12                                        enum grep_pat_token t,
  13                                        enum grep_header_field field)
  14{
  15        struct grep_pat *p = xcalloc(1, sizeof(*p));
  16        p->pattern = xmemdupz(pat, patlen);
  17        p->patternlen = patlen;
  18        p->origin = origin;
  19        p->no = no;
  20        p->token = t;
  21        p->field = field;
  22        return p;
  23}
  24
  25static void do_append_grep_pat(struct grep_pat ***tail, struct grep_pat *p)
  26{
  27        **tail = p;
  28        *tail = &p->next;
  29        p->next = NULL;
  30
  31        switch (p->token) {
  32        case GREP_PATTERN: /* atom */
  33        case GREP_PATTERN_HEAD:
  34        case GREP_PATTERN_BODY:
  35                for (;;) {
  36                        struct grep_pat *new_pat;
  37                        size_t len = 0;
  38                        char *cp = p->pattern + p->patternlen, *nl = NULL;
  39                        while (++len <= p->patternlen) {
  40                                if (*(--cp) == '\n') {
  41                                        nl = cp;
  42                                        break;
  43                                }
  44                        }
  45                        if (!nl)
  46                                break;
  47                        new_pat = create_grep_pat(nl + 1, len - 1, p->origin,
  48                                                  p->no, p->token, p->field);
  49                        new_pat->next = p->next;
  50                        if (!p->next)
  51                                *tail = &new_pat->next;
  52                        p->next = new_pat;
  53                        *nl = '\0';
  54                        p->patternlen -= len;
  55                }
  56                break;
  57        default:
  58                break;
  59        }
  60}
  61
  62void append_header_grep_pattern(struct grep_opt *opt,
  63                                enum grep_header_field field, const char *pat)
  64{
  65        struct grep_pat *p = create_grep_pat(pat, strlen(pat), "header", 0,
  66                                             GREP_PATTERN_HEAD, field);
  67        do_append_grep_pat(&opt->header_tail, p);
  68}
  69
  70void append_grep_pattern(struct grep_opt *opt, const char *pat,
  71                         const char *origin, int no, enum grep_pat_token t)
  72{
  73        append_grep_pat(opt, pat, strlen(pat), origin, no, t);
  74}
  75
  76void append_grep_pat(struct grep_opt *opt, const char *pat, size_t patlen,
  77                     const char *origin, int no, enum grep_pat_token t)
  78{
  79        struct grep_pat *p = create_grep_pat(pat, patlen, origin, no, t, 0);
  80        do_append_grep_pat(&opt->pattern_tail, p);
  81}
  82
  83struct grep_opt *grep_opt_dup(const struct grep_opt *opt)
  84{
  85        struct grep_pat *pat;
  86        struct grep_opt *ret = xmalloc(sizeof(struct grep_opt));
  87        *ret = *opt;
  88
  89        ret->pattern_list = NULL;
  90        ret->pattern_tail = &ret->pattern_list;
  91
  92        for(pat = opt->pattern_list; pat != NULL; pat = pat->next)
  93        {
  94                if(pat->token == GREP_PATTERN_HEAD)
  95                        append_header_grep_pattern(ret, pat->field,
  96                                                   pat->pattern);
  97                else
  98                        append_grep_pat(ret, pat->pattern, pat->patternlen,
  99                                        pat->origin, pat->no, pat->token);
 100        }
 101
 102        return ret;
 103}
 104
 105static NORETURN void compile_regexp_failed(const struct grep_pat *p,
 106                const char *error)
 107{
 108        char where[1024];
 109
 110        if (p->no)
 111                sprintf(where, "In '%s' at %d, ", p->origin, p->no);
 112        else if (p->origin)
 113                sprintf(where, "%s, ", p->origin);
 114        else
 115                where[0] = 0;
 116
 117        die("%s'%s': %s", where, p->pattern, error);
 118}
 119
 120#ifdef USE_LIBPCRE
 121static void compile_pcre_regexp(struct grep_pat *p, const struct grep_opt *opt)
 122{
 123        const char *error;
 124        int erroffset;
 125        int options = PCRE_MULTILINE;
 126
 127        if (opt->ignore_case)
 128                options |= PCRE_CASELESS;
 129
 130        p->pcre_regexp = pcre_compile(p->pattern, options, &error, &erroffset,
 131                        NULL);
 132        if (!p->pcre_regexp)
 133                compile_regexp_failed(p, error);
 134
 135        p->pcre_extra_info = pcre_study(p->pcre_regexp, 0, &error);
 136        if (!p->pcre_extra_info && error)
 137                die("%s", error);
 138}
 139
 140static int pcrematch(struct grep_pat *p, const char *line, const char *eol,
 141                regmatch_t *match, int eflags)
 142{
 143        int ovector[30], ret, flags = 0;
 144
 145        if (eflags & REG_NOTBOL)
 146                flags |= PCRE_NOTBOL;
 147
 148        ret = pcre_exec(p->pcre_regexp, p->pcre_extra_info, line, eol - line,
 149                        0, flags, ovector, ARRAY_SIZE(ovector));
 150        if (ret < 0 && ret != PCRE_ERROR_NOMATCH)
 151                die("pcre_exec failed with error code %d", ret);
 152        if (ret > 0) {
 153                ret = 0;
 154                match->rm_so = ovector[0];
 155                match->rm_eo = ovector[1];
 156        }
 157
 158        return ret;
 159}
 160
 161static void free_pcre_regexp(struct grep_pat *p)
 162{
 163        pcre_free(p->pcre_regexp);
 164        pcre_free(p->pcre_extra_info);
 165}
 166#else /* !USE_LIBPCRE */
 167static void compile_pcre_regexp(struct grep_pat *p, const struct grep_opt *opt)
 168{
 169        die("cannot use Perl-compatible regexes when not compiled with USE_LIBPCRE");
 170}
 171
 172static int pcrematch(struct grep_pat *p, const char *line, const char *eol,
 173                regmatch_t *match, int eflags)
 174{
 175        return 1;
 176}
 177
 178static void free_pcre_regexp(struct grep_pat *p)
 179{
 180}
 181#endif /* !USE_LIBPCRE */
 182
 183static int is_fixed(const char *s, size_t len)
 184{
 185        size_t i;
 186
 187        /* regcomp cannot accept patterns with NULs so we
 188         * consider any pattern containing a NUL fixed.
 189         */
 190        if (memchr(s, 0, len))
 191                return 1;
 192
 193        for (i = 0; i < len; i++) {
 194                if (is_regex_special(s[i]))
 195                        return 0;
 196        }
 197
 198        return 1;
 199}
 200
 201static void compile_regexp(struct grep_pat *p, struct grep_opt *opt)
 202{
 203        int err;
 204
 205        p->word_regexp = opt->word_regexp;
 206        p->ignore_case = opt->ignore_case;
 207
 208        if (opt->fixed || is_fixed(p->pattern, p->patternlen))
 209                p->fixed = 1;
 210        else
 211                p->fixed = 0;
 212
 213        if (p->fixed) {
 214                if (opt->regflags & REG_ICASE || p->ignore_case)
 215                        p->kws = kwsalloc(tolower_trans_tbl);
 216                else
 217                        p->kws = kwsalloc(NULL);
 218                kwsincr(p->kws, p->pattern, p->patternlen);
 219                kwsprep(p->kws);
 220                return;
 221        }
 222
 223        if (opt->pcre) {
 224                compile_pcre_regexp(p, opt);
 225                return;
 226        }
 227
 228        err = regcomp(&p->regexp, p->pattern, opt->regflags);
 229        if (err) {
 230                char errbuf[1024];
 231                regerror(err, &p->regexp, errbuf, 1024);
 232                regfree(&p->regexp);
 233                compile_regexp_failed(p, errbuf);
 234        }
 235}
 236
 237static struct grep_expr *compile_pattern_or(struct grep_pat **);
 238static struct grep_expr *compile_pattern_atom(struct grep_pat **list)
 239{
 240        struct grep_pat *p;
 241        struct grep_expr *x;
 242
 243        p = *list;
 244        if (!p)
 245                return NULL;
 246        switch (p->token) {
 247        case GREP_PATTERN: /* atom */
 248        case GREP_PATTERN_HEAD:
 249        case GREP_PATTERN_BODY:
 250                x = xcalloc(1, sizeof (struct grep_expr));
 251                x->node = GREP_NODE_ATOM;
 252                x->u.atom = p;
 253                *list = p->next;
 254                return x;
 255        case GREP_OPEN_PAREN:
 256                *list = p->next;
 257                x = compile_pattern_or(list);
 258                if (!*list || (*list)->token != GREP_CLOSE_PAREN)
 259                        die("unmatched parenthesis");
 260                *list = (*list)->next;
 261                return x;
 262        default:
 263                return NULL;
 264        }
 265}
 266
 267static struct grep_expr *compile_pattern_not(struct grep_pat **list)
 268{
 269        struct grep_pat *p;
 270        struct grep_expr *x;
 271
 272        p = *list;
 273        if (!p)
 274                return NULL;
 275        switch (p->token) {
 276        case GREP_NOT:
 277                if (!p->next)
 278                        die("--not not followed by pattern expression");
 279                *list = p->next;
 280                x = xcalloc(1, sizeof (struct grep_expr));
 281                x->node = GREP_NODE_NOT;
 282                x->u.unary = compile_pattern_not(list);
 283                if (!x->u.unary)
 284                        die("--not followed by non pattern expression");
 285                return x;
 286        default:
 287                return compile_pattern_atom(list);
 288        }
 289}
 290
 291static struct grep_expr *compile_pattern_and(struct grep_pat **list)
 292{
 293        struct grep_pat *p;
 294        struct grep_expr *x, *y, *z;
 295
 296        x = compile_pattern_not(list);
 297        p = *list;
 298        if (p && p->token == GREP_AND) {
 299                if (!p->next)
 300                        die("--and not followed by pattern expression");
 301                *list = p->next;
 302                y = compile_pattern_and(list);
 303                if (!y)
 304                        die("--and not followed by pattern expression");
 305                z = xcalloc(1, sizeof (struct grep_expr));
 306                z->node = GREP_NODE_AND;
 307                z->u.binary.left = x;
 308                z->u.binary.right = y;
 309                return z;
 310        }
 311        return x;
 312}
 313
 314static struct grep_expr *compile_pattern_or(struct grep_pat **list)
 315{
 316        struct grep_pat *p;
 317        struct grep_expr *x, *y, *z;
 318
 319        x = compile_pattern_and(list);
 320        p = *list;
 321        if (x && p && p->token != GREP_CLOSE_PAREN) {
 322                y = compile_pattern_or(list);
 323                if (!y)
 324                        die("not a pattern expression %s", p->pattern);
 325                z = xcalloc(1, sizeof (struct grep_expr));
 326                z->node = GREP_NODE_OR;
 327                z->u.binary.left = x;
 328                z->u.binary.right = y;
 329                return z;
 330        }
 331        return x;
 332}
 333
 334static struct grep_expr *compile_pattern_expr(struct grep_pat **list)
 335{
 336        return compile_pattern_or(list);
 337}
 338
 339static void indent(int in)
 340{
 341        while (in-- > 0)
 342                fputc(' ', stderr);
 343}
 344
 345static void dump_grep_pat(struct grep_pat *p)
 346{
 347        switch (p->token) {
 348        case GREP_AND: fprintf(stderr, "*and*"); break;
 349        case GREP_OPEN_PAREN: fprintf(stderr, "*(*"); break;
 350        case GREP_CLOSE_PAREN: fprintf(stderr, "*)*"); break;
 351        case GREP_NOT: fprintf(stderr, "*not*"); break;
 352        case GREP_OR: fprintf(stderr, "*or*"); break;
 353
 354        case GREP_PATTERN: fprintf(stderr, "pattern"); break;
 355        case GREP_PATTERN_HEAD: fprintf(stderr, "pattern_head"); break;
 356        case GREP_PATTERN_BODY: fprintf(stderr, "pattern_body"); break;
 357        }
 358
 359        switch (p->token) {
 360        default: break;
 361        case GREP_PATTERN_HEAD:
 362                fprintf(stderr, "<head %d>", p->field); break;
 363        case GREP_PATTERN_BODY:
 364                fprintf(stderr, "<body>"); break;
 365        }
 366        switch (p->token) {
 367        default: break;
 368        case GREP_PATTERN_HEAD:
 369        case GREP_PATTERN_BODY:
 370        case GREP_PATTERN:
 371                fprintf(stderr, "%.*s", (int)p->patternlen, p->pattern);
 372                break;
 373        }
 374        fputc('\n', stderr);
 375}
 376
 377static void dump_grep_expression_1(struct grep_expr *x, int in)
 378{
 379        indent(in);
 380        switch (x->node) {
 381        case GREP_NODE_TRUE:
 382                fprintf(stderr, "true\n");
 383                break;
 384        case GREP_NODE_ATOM:
 385                dump_grep_pat(x->u.atom);
 386                break;
 387        case GREP_NODE_NOT:
 388                fprintf(stderr, "(not\n");
 389                dump_grep_expression_1(x->u.unary, in+1);
 390                indent(in);
 391                fprintf(stderr, ")\n");
 392                break;
 393        case GREP_NODE_AND:
 394                fprintf(stderr, "(and\n");
 395                dump_grep_expression_1(x->u.binary.left, in+1);
 396                dump_grep_expression_1(x->u.binary.right, in+1);
 397                indent(in);
 398                fprintf(stderr, ")\n");
 399                break;
 400        case GREP_NODE_OR:
 401                fprintf(stderr, "(or\n");
 402                dump_grep_expression_1(x->u.binary.left, in+1);
 403                dump_grep_expression_1(x->u.binary.right, in+1);
 404                indent(in);
 405                fprintf(stderr, ")\n");
 406                break;
 407        }
 408}
 409
 410static void dump_grep_expression(struct grep_opt *opt)
 411{
 412        struct grep_expr *x = opt->pattern_expression;
 413
 414        if (opt->all_match)
 415                fprintf(stderr, "[all-match]\n");
 416        dump_grep_expression_1(x, 0);
 417        fflush(NULL);
 418}
 419
 420static struct grep_expr *grep_true_expr(void)
 421{
 422        struct grep_expr *z = xcalloc(1, sizeof(*z));
 423        z->node = GREP_NODE_TRUE;
 424        return z;
 425}
 426
 427static struct grep_expr *grep_or_expr(struct grep_expr *left, struct grep_expr *right)
 428{
 429        struct grep_expr *z = xcalloc(1, sizeof(*z));
 430        z->node = GREP_NODE_OR;
 431        z->u.binary.left = left;
 432        z->u.binary.right = right;
 433        return z;
 434}
 435
 436static struct grep_expr *prep_header_patterns(struct grep_opt *opt)
 437{
 438        struct grep_pat *p;
 439        struct grep_expr *header_expr;
 440        struct grep_expr *(header_group[GREP_HEADER_FIELD_MAX]);
 441        enum grep_header_field fld;
 442
 443        if (!opt->header_list)
 444                return NULL;
 445
 446        for (p = opt->header_list; p; p = p->next) {
 447                if (p->token != GREP_PATTERN_HEAD)
 448                        die("bug: a non-header pattern in grep header list.");
 449                if (p->field < 0 || GREP_HEADER_FIELD_MAX <= p->field)
 450                        die("bug: unknown header field %d", p->field);
 451                compile_regexp(p, opt);
 452        }
 453
 454        for (fld = 0; fld < GREP_HEADER_FIELD_MAX; fld++)
 455                header_group[fld] = NULL;
 456
 457        for (p = opt->header_list; p; p = p->next) {
 458                struct grep_expr *h;
 459                struct grep_pat *pp = p;
 460
 461                h = compile_pattern_atom(&pp);
 462                if (!h || pp != p->next)
 463                        die("bug: malformed header expr");
 464                if (!header_group[p->field]) {
 465                        header_group[p->field] = h;
 466                        continue;
 467                }
 468                header_group[p->field] = grep_or_expr(h, header_group[p->field]);
 469        }
 470
 471        header_expr = NULL;
 472
 473        for (fld = 0; fld < GREP_HEADER_FIELD_MAX; fld++) {
 474                if (!header_group[fld])
 475                        continue;
 476                if (!header_expr)
 477                        header_expr = grep_true_expr();
 478                header_expr = grep_or_expr(header_group[fld], header_expr);
 479        }
 480        return header_expr;
 481}
 482
 483static struct grep_expr *grep_splice_or(struct grep_expr *x, struct grep_expr *y)
 484{
 485        struct grep_expr *z = x;
 486
 487        while (x) {
 488                assert(x->node == GREP_NODE_OR);
 489                if (x->u.binary.right &&
 490                    x->u.binary.right->node == GREP_NODE_TRUE) {
 491                        x->u.binary.right = y;
 492                        break;
 493                }
 494                x = x->u.binary.right;
 495        }
 496        return z;
 497}
 498
 499static void compile_grep_patterns_real(struct grep_opt *opt)
 500{
 501        struct grep_pat *p;
 502        struct grep_expr *header_expr = prep_header_patterns(opt);
 503
 504        for (p = opt->pattern_list; p; p = p->next) {
 505                switch (p->token) {
 506                case GREP_PATTERN: /* atom */
 507                case GREP_PATTERN_HEAD:
 508                case GREP_PATTERN_BODY:
 509                        compile_regexp(p, opt);
 510                        break;
 511                default:
 512                        opt->extended = 1;
 513                        break;
 514                }
 515        }
 516
 517        if (opt->all_match || header_expr)
 518                opt->extended = 1;
 519        else if (!opt->extended && !opt->debug)
 520                return;
 521
 522        p = opt->pattern_list;
 523        if (p)
 524                opt->pattern_expression = compile_pattern_expr(&p);
 525        if (p)
 526                die("incomplete pattern expression: %s", p->pattern);
 527
 528        if (!header_expr)
 529                return;
 530
 531        if (!opt->pattern_expression)
 532                opt->pattern_expression = header_expr;
 533        else if (opt->all_match)
 534                opt->pattern_expression = grep_splice_or(header_expr,
 535                                                         opt->pattern_expression);
 536        else
 537                opt->pattern_expression = grep_or_expr(opt->pattern_expression,
 538                                                       header_expr);
 539        opt->all_match = 1;
 540}
 541
 542void compile_grep_patterns(struct grep_opt *opt)
 543{
 544        compile_grep_patterns_real(opt);
 545        if (opt->debug)
 546                dump_grep_expression(opt);
 547}
 548
 549static void free_pattern_expr(struct grep_expr *x)
 550{
 551        switch (x->node) {
 552        case GREP_NODE_TRUE:
 553        case GREP_NODE_ATOM:
 554                break;
 555        case GREP_NODE_NOT:
 556                free_pattern_expr(x->u.unary);
 557                break;
 558        case GREP_NODE_AND:
 559        case GREP_NODE_OR:
 560                free_pattern_expr(x->u.binary.left);
 561                free_pattern_expr(x->u.binary.right);
 562                break;
 563        }
 564        free(x);
 565}
 566
 567void free_grep_patterns(struct grep_opt *opt)
 568{
 569        struct grep_pat *p, *n;
 570
 571        for (p = opt->pattern_list; p; p = n) {
 572                n = p->next;
 573                switch (p->token) {
 574                case GREP_PATTERN: /* atom */
 575                case GREP_PATTERN_HEAD:
 576                case GREP_PATTERN_BODY:
 577                        if (p->kws)
 578                                kwsfree(p->kws);
 579                        else if (p->pcre_regexp)
 580                                free_pcre_regexp(p);
 581                        else
 582                                regfree(&p->regexp);
 583                        free(p->pattern);
 584                        break;
 585                default:
 586                        break;
 587                }
 588                free(p);
 589        }
 590
 591        if (!opt->extended)
 592                return;
 593        free_pattern_expr(opt->pattern_expression);
 594}
 595
 596static char *end_of_line(char *cp, unsigned long *left)
 597{
 598        unsigned long l = *left;
 599        while (l && *cp != '\n') {
 600                l--;
 601                cp++;
 602        }
 603        *left = l;
 604        return cp;
 605}
 606
 607static int word_char(char ch)
 608{
 609        return isalnum(ch) || ch == '_';
 610}
 611
 612static void output_color(struct grep_opt *opt, const void *data, size_t size,
 613                         const char *color)
 614{
 615        if (want_color(opt->color) && color && color[0]) {
 616                opt->output(opt, color, strlen(color));
 617                opt->output(opt, data, size);
 618                opt->output(opt, GIT_COLOR_RESET, strlen(GIT_COLOR_RESET));
 619        } else
 620                opt->output(opt, data, size);
 621}
 622
 623static void output_sep(struct grep_opt *opt, char sign)
 624{
 625        if (opt->null_following_name)
 626                opt->output(opt, "\0", 1);
 627        else
 628                output_color(opt, &sign, 1, opt->color_sep);
 629}
 630
 631static void show_name(struct grep_opt *opt, const char *name)
 632{
 633        output_color(opt, name, strlen(name), opt->color_filename);
 634        opt->output(opt, opt->null_following_name ? "\0" : "\n", 1);
 635}
 636
 637static int fixmatch(struct grep_pat *p, char *line, char *eol,
 638                    regmatch_t *match)
 639{
 640        struct kwsmatch kwsm;
 641        size_t offset = kwsexec(p->kws, line, eol - line, &kwsm);
 642        if (offset == -1) {
 643                match->rm_so = match->rm_eo = -1;
 644                return REG_NOMATCH;
 645        } else {
 646                match->rm_so = offset;
 647                match->rm_eo = match->rm_so + kwsm.size[0];
 648                return 0;
 649        }
 650}
 651
 652static int regmatch(const regex_t *preg, char *line, char *eol,
 653                    regmatch_t *match, int eflags)
 654{
 655#ifdef REG_STARTEND
 656        match->rm_so = 0;
 657        match->rm_eo = eol - line;
 658        eflags |= REG_STARTEND;
 659#endif
 660        return regexec(preg, line, 1, match, eflags);
 661}
 662
 663static int patmatch(struct grep_pat *p, char *line, char *eol,
 664                    regmatch_t *match, int eflags)
 665{
 666        int hit;
 667
 668        if (p->fixed)
 669                hit = !fixmatch(p, line, eol, match);
 670        else if (p->pcre_regexp)
 671                hit = !pcrematch(p, line, eol, match, eflags);
 672        else
 673                hit = !regmatch(&p->regexp, line, eol, match, eflags);
 674
 675        return hit;
 676}
 677
 678static int strip_timestamp(char *bol, char **eol_p)
 679{
 680        char *eol = *eol_p;
 681        int ch;
 682
 683        while (bol < --eol) {
 684                if (*eol != '>')
 685                        continue;
 686                *eol_p = ++eol;
 687                ch = *eol;
 688                *eol = '\0';
 689                return ch;
 690        }
 691        return 0;
 692}
 693
 694static struct {
 695        const char *field;
 696        size_t len;
 697} header_field[] = {
 698        { "author ", 7 },
 699        { "committer ", 10 },
 700};
 701
 702static int match_one_pattern(struct grep_pat *p, char *bol, char *eol,
 703                             enum grep_context ctx,
 704                             regmatch_t *pmatch, int eflags)
 705{
 706        int hit = 0;
 707        int saved_ch = 0;
 708        const char *start = bol;
 709
 710        if ((p->token != GREP_PATTERN) &&
 711            ((p->token == GREP_PATTERN_HEAD) != (ctx == GREP_CONTEXT_HEAD)))
 712                return 0;
 713
 714        if (p->token == GREP_PATTERN_HEAD) {
 715                const char *field;
 716                size_t len;
 717                assert(p->field < ARRAY_SIZE(header_field));
 718                field = header_field[p->field].field;
 719                len = header_field[p->field].len;
 720                if (strncmp(bol, field, len))
 721                        return 0;
 722                bol += len;
 723                saved_ch = strip_timestamp(bol, &eol);
 724        }
 725
 726 again:
 727        hit = patmatch(p, bol, eol, pmatch, eflags);
 728
 729        if (hit && p->word_regexp) {
 730                if ((pmatch[0].rm_so < 0) ||
 731                    (eol - bol) < pmatch[0].rm_so ||
 732                    (pmatch[0].rm_eo < 0) ||
 733                    (eol - bol) < pmatch[0].rm_eo)
 734                        die("regexp returned nonsense");
 735
 736                /* Match beginning must be either beginning of the
 737                 * line, or at word boundary (i.e. the last char must
 738                 * not be a word char).  Similarly, match end must be
 739                 * either end of the line, or at word boundary
 740                 * (i.e. the next char must not be a word char).
 741                 */
 742                if ( ((pmatch[0].rm_so == 0) ||
 743                      !word_char(bol[pmatch[0].rm_so-1])) &&
 744                     ((pmatch[0].rm_eo == (eol-bol)) ||
 745                      !word_char(bol[pmatch[0].rm_eo])) )
 746                        ;
 747                else
 748                        hit = 0;
 749
 750                /* Words consist of at least one character. */
 751                if (pmatch->rm_so == pmatch->rm_eo)
 752                        hit = 0;
 753
 754                if (!hit && pmatch[0].rm_so + bol + 1 < eol) {
 755                        /* There could be more than one match on the
 756                         * line, and the first match might not be
 757                         * strict word match.  But later ones could be!
 758                         * Forward to the next possible start, i.e. the
 759                         * next position following a non-word char.
 760                         */
 761                        bol = pmatch[0].rm_so + bol + 1;
 762                        while (word_char(bol[-1]) && bol < eol)
 763                                bol++;
 764                        eflags |= REG_NOTBOL;
 765                        if (bol < eol)
 766                                goto again;
 767                }
 768        }
 769        if (p->token == GREP_PATTERN_HEAD && saved_ch)
 770                *eol = saved_ch;
 771        if (hit) {
 772                pmatch[0].rm_so += bol - start;
 773                pmatch[0].rm_eo += bol - start;
 774        }
 775        return hit;
 776}
 777
 778static int match_expr_eval(struct grep_expr *x, char *bol, char *eol,
 779                           enum grep_context ctx, int collect_hits)
 780{
 781        int h = 0;
 782        regmatch_t match;
 783
 784        if (!x)
 785                die("Not a valid grep expression");
 786        switch (x->node) {
 787        case GREP_NODE_TRUE:
 788                h = 1;
 789                break;
 790        case GREP_NODE_ATOM:
 791                h = match_one_pattern(x->u.atom, bol, eol, ctx, &match, 0);
 792                break;
 793        case GREP_NODE_NOT:
 794                h = !match_expr_eval(x->u.unary, bol, eol, ctx, 0);
 795                break;
 796        case GREP_NODE_AND:
 797                if (!match_expr_eval(x->u.binary.left, bol, eol, ctx, 0))
 798                        return 0;
 799                h = match_expr_eval(x->u.binary.right, bol, eol, ctx, 0);
 800                break;
 801        case GREP_NODE_OR:
 802                if (!collect_hits)
 803                        return (match_expr_eval(x->u.binary.left,
 804                                                bol, eol, ctx, 0) ||
 805                                match_expr_eval(x->u.binary.right,
 806                                                bol, eol, ctx, 0));
 807                h = match_expr_eval(x->u.binary.left, bol, eol, ctx, 0);
 808                x->u.binary.left->hit |= h;
 809                h |= match_expr_eval(x->u.binary.right, bol, eol, ctx, 1);
 810                break;
 811        default:
 812                die("Unexpected node type (internal error) %d", x->node);
 813        }
 814        if (collect_hits)
 815                x->hit |= h;
 816        return h;
 817}
 818
 819static int match_expr(struct grep_opt *opt, char *bol, char *eol,
 820                      enum grep_context ctx, int collect_hits)
 821{
 822        struct grep_expr *x = opt->pattern_expression;
 823        return match_expr_eval(x, bol, eol, ctx, collect_hits);
 824}
 825
 826static int match_line(struct grep_opt *opt, char *bol, char *eol,
 827                      enum grep_context ctx, int collect_hits)
 828{
 829        struct grep_pat *p;
 830        regmatch_t match;
 831
 832        if (opt->extended)
 833                return match_expr(opt, bol, eol, ctx, collect_hits);
 834
 835        /* we do not call with collect_hits without being extended */
 836        for (p = opt->pattern_list; p; p = p->next) {
 837                if (match_one_pattern(p, bol, eol, ctx, &match, 0))
 838                        return 1;
 839        }
 840        return 0;
 841}
 842
 843static int match_next_pattern(struct grep_pat *p, char *bol, char *eol,
 844                              enum grep_context ctx,
 845                              regmatch_t *pmatch, int eflags)
 846{
 847        regmatch_t match;
 848
 849        if (!match_one_pattern(p, bol, eol, ctx, &match, eflags))
 850                return 0;
 851        if (match.rm_so < 0 || match.rm_eo < 0)
 852                return 0;
 853        if (pmatch->rm_so >= 0 && pmatch->rm_eo >= 0) {
 854                if (match.rm_so > pmatch->rm_so)
 855                        return 1;
 856                if (match.rm_so == pmatch->rm_so && match.rm_eo < pmatch->rm_eo)
 857                        return 1;
 858        }
 859        pmatch->rm_so = match.rm_so;
 860        pmatch->rm_eo = match.rm_eo;
 861        return 1;
 862}
 863
 864static int next_match(struct grep_opt *opt, char *bol, char *eol,
 865                      enum grep_context ctx, regmatch_t *pmatch, int eflags)
 866{
 867        struct grep_pat *p;
 868        int hit = 0;
 869
 870        pmatch->rm_so = pmatch->rm_eo = -1;
 871        if (bol < eol) {
 872                for (p = opt->pattern_list; p; p = p->next) {
 873                        switch (p->token) {
 874                        case GREP_PATTERN: /* atom */
 875                        case GREP_PATTERN_HEAD:
 876                        case GREP_PATTERN_BODY:
 877                                hit |= match_next_pattern(p, bol, eol, ctx,
 878                                                          pmatch, eflags);
 879                                break;
 880                        default:
 881                                break;
 882                        }
 883                }
 884        }
 885        return hit;
 886}
 887
 888static void show_line(struct grep_opt *opt, char *bol, char *eol,
 889                      const char *name, unsigned lno, char sign)
 890{
 891        int rest = eol - bol;
 892        char *line_color = NULL;
 893
 894        if (opt->file_break && opt->last_shown == 0) {
 895                if (opt->show_hunk_mark)
 896                        opt->output(opt, "\n", 1);
 897        } else if (opt->pre_context || opt->post_context || opt->funcbody) {
 898                if (opt->last_shown == 0) {
 899                        if (opt->show_hunk_mark) {
 900                                output_color(opt, "--", 2, opt->color_sep);
 901                                opt->output(opt, "\n", 1);
 902                        }
 903                } else if (lno > opt->last_shown + 1) {
 904                        output_color(opt, "--", 2, opt->color_sep);
 905                        opt->output(opt, "\n", 1);
 906                }
 907        }
 908        if (opt->heading && opt->last_shown == 0) {
 909                output_color(opt, name, strlen(name), opt->color_filename);
 910                opt->output(opt, "\n", 1);
 911        }
 912        opt->last_shown = lno;
 913
 914        if (!opt->heading && opt->pathname) {
 915                output_color(opt, name, strlen(name), opt->color_filename);
 916                output_sep(opt, sign);
 917        }
 918        if (opt->linenum) {
 919                char buf[32];
 920                snprintf(buf, sizeof(buf), "%d", lno);
 921                output_color(opt, buf, strlen(buf), opt->color_lineno);
 922                output_sep(opt, sign);
 923        }
 924        if (opt->color) {
 925                regmatch_t match;
 926                enum grep_context ctx = GREP_CONTEXT_BODY;
 927                int ch = *eol;
 928                int eflags = 0;
 929
 930                if (sign == ':')
 931                        line_color = opt->color_selected;
 932                else if (sign == '-')
 933                        line_color = opt->color_context;
 934                else if (sign == '=')
 935                        line_color = opt->color_function;
 936                *eol = '\0';
 937                while (next_match(opt, bol, eol, ctx, &match, eflags)) {
 938                        if (match.rm_so == match.rm_eo)
 939                                break;
 940
 941                        output_color(opt, bol, match.rm_so, line_color);
 942                        output_color(opt, bol + match.rm_so,
 943                                     match.rm_eo - match.rm_so,
 944                                     opt->color_match);
 945                        bol += match.rm_eo;
 946                        rest -= match.rm_eo;
 947                        eflags = REG_NOTBOL;
 948                }
 949                *eol = ch;
 950        }
 951        output_color(opt, bol, rest, line_color);
 952        opt->output(opt, "\n", 1);
 953}
 954
 955#ifndef NO_PTHREADS
 956int grep_use_locks;
 957
 958/*
 959 * This lock protects access to the gitattributes machinery, which is
 960 * not thread-safe.
 961 */
 962pthread_mutex_t grep_attr_mutex;
 963
 964static inline void grep_attr_lock(void)
 965{
 966        if (grep_use_locks)
 967                pthread_mutex_lock(&grep_attr_mutex);
 968}
 969
 970static inline void grep_attr_unlock(void)
 971{
 972        if (grep_use_locks)
 973                pthread_mutex_unlock(&grep_attr_mutex);
 974}
 975
 976/*
 977 * Same as git_attr_mutex, but protecting the thread-unsafe object db access.
 978 */
 979pthread_mutex_t grep_read_mutex;
 980
 981#else
 982#define grep_attr_lock()
 983#define grep_attr_unlock()
 984#endif
 985
 986static int match_funcname(struct grep_opt *opt, struct grep_source *gs, char *bol, char *eol)
 987{
 988        xdemitconf_t *xecfg = opt->priv;
 989        if (xecfg && !xecfg->find_func) {
 990                grep_source_load_driver(gs);
 991                if (gs->driver->funcname.pattern) {
 992                        const struct userdiff_funcname *pe = &gs->driver->funcname;
 993                        xdiff_set_find_func(xecfg, pe->pattern, pe->cflags);
 994                } else {
 995                        xecfg = opt->priv = NULL;
 996                }
 997        }
 998
 999        if (xecfg) {
1000                char buf[1];
1001                return xecfg->find_func(bol, eol - bol, buf, 1,
1002                                        xecfg->find_func_priv) >= 0;
1003        }
1004
1005        if (bol == eol)
1006                return 0;
1007        if (isalpha(*bol) || *bol == '_' || *bol == '$')
1008                return 1;
1009        return 0;
1010}
1011
1012static void show_funcname_line(struct grep_opt *opt, struct grep_source *gs,
1013                               char *bol, unsigned lno)
1014{
1015        while (bol > gs->buf) {
1016                char *eol = --bol;
1017
1018                while (bol > gs->buf && bol[-1] != '\n')
1019                        bol--;
1020                lno--;
1021
1022                if (lno <= opt->last_shown)
1023                        break;
1024
1025                if (match_funcname(opt, gs, bol, eol)) {
1026                        show_line(opt, bol, eol, gs->name, lno, '=');
1027                        break;
1028                }
1029        }
1030}
1031
1032static void show_pre_context(struct grep_opt *opt, struct grep_source *gs,
1033                             char *bol, char *end, unsigned lno)
1034{
1035        unsigned cur = lno, from = 1, funcname_lno = 0;
1036        int funcname_needed = !!opt->funcname;
1037
1038        if (opt->funcbody && !match_funcname(opt, gs, bol, end))
1039                funcname_needed = 2;
1040
1041        if (opt->pre_context < lno)
1042                from = lno - opt->pre_context;
1043        if (from <= opt->last_shown)
1044                from = opt->last_shown + 1;
1045
1046        /* Rewind. */
1047        while (bol > gs->buf &&
1048               cur > (funcname_needed == 2 ? opt->last_shown + 1 : from)) {
1049                char *eol = --bol;
1050
1051                while (bol > gs->buf && bol[-1] != '\n')
1052                        bol--;
1053                cur--;
1054                if (funcname_needed && match_funcname(opt, gs, bol, eol)) {
1055                        funcname_lno = cur;
1056                        funcname_needed = 0;
1057                }
1058        }
1059
1060        /* We need to look even further back to find a function signature. */
1061        if (opt->funcname && funcname_needed)
1062                show_funcname_line(opt, gs, bol, cur);
1063
1064        /* Back forward. */
1065        while (cur < lno) {
1066                char *eol = bol, sign = (cur == funcname_lno) ? '=' : '-';
1067
1068                while (*eol != '\n')
1069                        eol++;
1070                show_line(opt, bol, eol, gs->name, cur, sign);
1071                bol = eol + 1;
1072                cur++;
1073        }
1074}
1075
1076static int should_lookahead(struct grep_opt *opt)
1077{
1078        struct grep_pat *p;
1079
1080        if (opt->extended)
1081                return 0; /* punt for too complex stuff */
1082        if (opt->invert)
1083                return 0;
1084        for (p = opt->pattern_list; p; p = p->next) {
1085                if (p->token != GREP_PATTERN)
1086                        return 0; /* punt for "header only" and stuff */
1087        }
1088        return 1;
1089}
1090
1091static int look_ahead(struct grep_opt *opt,
1092                      unsigned long *left_p,
1093                      unsigned *lno_p,
1094                      char **bol_p)
1095{
1096        unsigned lno = *lno_p;
1097        char *bol = *bol_p;
1098        struct grep_pat *p;
1099        char *sp, *last_bol;
1100        regoff_t earliest = -1;
1101
1102        for (p = opt->pattern_list; p; p = p->next) {
1103                int hit;
1104                regmatch_t m;
1105
1106                hit = patmatch(p, bol, bol + *left_p, &m, 0);
1107                if (!hit || m.rm_so < 0 || m.rm_eo < 0)
1108                        continue;
1109                if (earliest < 0 || m.rm_so < earliest)
1110                        earliest = m.rm_so;
1111        }
1112
1113        if (earliest < 0) {
1114                *bol_p = bol + *left_p;
1115                *left_p = 0;
1116                return 1;
1117        }
1118        for (sp = bol + earliest; bol < sp && sp[-1] != '\n'; sp--)
1119                ; /* find the beginning of the line */
1120        last_bol = sp;
1121
1122        for (sp = bol; sp < last_bol; sp++) {
1123                if (*sp == '\n')
1124                        lno++;
1125        }
1126        *left_p -= last_bol - bol;
1127        *bol_p = last_bol;
1128        *lno_p = lno;
1129        return 0;
1130}
1131
1132static void std_output(struct grep_opt *opt, const void *buf, size_t size)
1133{
1134        fwrite(buf, size, 1, stdout);
1135}
1136
1137static int grep_source_1(struct grep_opt *opt, struct grep_source *gs, int collect_hits)
1138{
1139        char *bol;
1140        unsigned long left;
1141        unsigned lno = 1;
1142        unsigned last_hit = 0;
1143        int binary_match_only = 0;
1144        unsigned count = 0;
1145        int try_lookahead = 0;
1146        int show_function = 0;
1147        enum grep_context ctx = GREP_CONTEXT_HEAD;
1148        xdemitconf_t xecfg;
1149
1150        if (!opt->output)
1151                opt->output = std_output;
1152
1153        if (opt->pre_context || opt->post_context || opt->file_break ||
1154            opt->funcbody) {
1155                /* Show hunk marks, except for the first file. */
1156                if (opt->last_shown)
1157                        opt->show_hunk_mark = 1;
1158                /*
1159                 * If we're using threads then we can't easily identify
1160                 * the first file.  Always put hunk marks in that case
1161                 * and skip the very first one later in work_done().
1162                 */
1163                if (opt->output != std_output)
1164                        opt->show_hunk_mark = 1;
1165        }
1166        opt->last_shown = 0;
1167
1168        switch (opt->binary) {
1169        case GREP_BINARY_DEFAULT:
1170                if (grep_source_is_binary(gs))
1171                        binary_match_only = 1;
1172                break;
1173        case GREP_BINARY_NOMATCH:
1174                if (grep_source_is_binary(gs))
1175                        return 0; /* Assume unmatch */
1176                break;
1177        case GREP_BINARY_TEXT:
1178                break;
1179        default:
1180                die("bug: unknown binary handling mode");
1181        }
1182
1183        memset(&xecfg, 0, sizeof(xecfg));
1184        opt->priv = &xecfg;
1185
1186        try_lookahead = should_lookahead(opt);
1187
1188        if (grep_source_load(gs) < 0)
1189                return 0;
1190
1191        bol = gs->buf;
1192        left = gs->size;
1193        while (left) {
1194                char *eol, ch;
1195                int hit;
1196
1197                /*
1198                 * look_ahead() skips quickly to the line that possibly
1199                 * has the next hit; don't call it if we need to do
1200                 * something more than just skipping the current line
1201                 * in response to an unmatch for the current line.  E.g.
1202                 * inside a post-context window, we will show the current
1203                 * line as a context around the previous hit when it
1204                 * doesn't hit.
1205                 */
1206                if (try_lookahead
1207                    && !(last_hit
1208                         && (show_function ||
1209                             lno <= last_hit + opt->post_context))
1210                    && look_ahead(opt, &left, &lno, &bol))
1211                        break;
1212                eol = end_of_line(bol, &left);
1213                ch = *eol;
1214                *eol = 0;
1215
1216                if ((ctx == GREP_CONTEXT_HEAD) && (eol == bol))
1217                        ctx = GREP_CONTEXT_BODY;
1218
1219                hit = match_line(opt, bol, eol, ctx, collect_hits);
1220                *eol = ch;
1221
1222                if (collect_hits)
1223                        goto next_line;
1224
1225                /* "grep -v -e foo -e bla" should list lines
1226                 * that do not have either, so inversion should
1227                 * be done outside.
1228                 */
1229                if (opt->invert)
1230                        hit = !hit;
1231                if (opt->unmatch_name_only) {
1232                        if (hit)
1233                                return 0;
1234                        goto next_line;
1235                }
1236                if (hit) {
1237                        count++;
1238                        if (opt->status_only)
1239                                return 1;
1240                        if (opt->name_only) {
1241                                show_name(opt, gs->name);
1242                                return 1;
1243                        }
1244                        if (opt->count)
1245                                goto next_line;
1246                        if (binary_match_only) {
1247                                opt->output(opt, "Binary file ", 12);
1248                                output_color(opt, gs->name, strlen(gs->name),
1249                                             opt->color_filename);
1250                                opt->output(opt, " matches\n", 9);
1251                                return 1;
1252                        }
1253                        /* Hit at this line.  If we haven't shown the
1254                         * pre-context lines, we would need to show them.
1255                         */
1256                        if (opt->pre_context || opt->funcbody)
1257                                show_pre_context(opt, gs, bol, eol, lno);
1258                        else if (opt->funcname)
1259                                show_funcname_line(opt, gs, bol, lno);
1260                        show_line(opt, bol, eol, gs->name, lno, ':');
1261                        last_hit = lno;
1262                        if (opt->funcbody)
1263                                show_function = 1;
1264                        goto next_line;
1265                }
1266                if (show_function && match_funcname(opt, gs, bol, eol))
1267                        show_function = 0;
1268                if (show_function ||
1269                    (last_hit && lno <= last_hit + opt->post_context)) {
1270                        /* If the last hit is within the post context,
1271                         * we need to show this line.
1272                         */
1273                        show_line(opt, bol, eol, gs->name, lno, '-');
1274                }
1275
1276        next_line:
1277                bol = eol + 1;
1278                if (!left)
1279                        break;
1280                left--;
1281                lno++;
1282        }
1283
1284        if (collect_hits)
1285                return 0;
1286
1287        if (opt->status_only)
1288                return 0;
1289        if (opt->unmatch_name_only) {
1290                /* We did not see any hit, so we want to show this */
1291                show_name(opt, gs->name);
1292                return 1;
1293        }
1294
1295        xdiff_clear_find_func(&xecfg);
1296        opt->priv = NULL;
1297
1298        /* NEEDSWORK:
1299         * The real "grep -c foo *.c" gives many "bar.c:0" lines,
1300         * which feels mostly useless but sometimes useful.  Maybe
1301         * make it another option?  For now suppress them.
1302         */
1303        if (opt->count && count) {
1304                char buf[32];
1305                output_color(opt, gs->name, strlen(gs->name), opt->color_filename);
1306                output_sep(opt, ':');
1307                snprintf(buf, sizeof(buf), "%u\n", count);
1308                opt->output(opt, buf, strlen(buf));
1309                return 1;
1310        }
1311        return !!last_hit;
1312}
1313
1314static void clr_hit_marker(struct grep_expr *x)
1315{
1316        /* All-hit markers are meaningful only at the very top level
1317         * OR node.
1318         */
1319        while (1) {
1320                x->hit = 0;
1321                if (x->node != GREP_NODE_OR)
1322                        return;
1323                x->u.binary.left->hit = 0;
1324                x = x->u.binary.right;
1325        }
1326}
1327
1328static int chk_hit_marker(struct grep_expr *x)
1329{
1330        /* Top level nodes have hit markers.  See if they all are hits */
1331        while (1) {
1332                if (x->node != GREP_NODE_OR)
1333                        return x->hit;
1334                if (!x->u.binary.left->hit)
1335                        return 0;
1336                x = x->u.binary.right;
1337        }
1338}
1339
1340int grep_source(struct grep_opt *opt, struct grep_source *gs)
1341{
1342        /*
1343         * we do not have to do the two-pass grep when we do not check
1344         * buffer-wide "all-match".
1345         */
1346        if (!opt->all_match)
1347                return grep_source_1(opt, gs, 0);
1348
1349        /* Otherwise the toplevel "or" terms hit a bit differently.
1350         * We first clear hit markers from them.
1351         */
1352        clr_hit_marker(opt->pattern_expression);
1353        grep_source_1(opt, gs, 1);
1354
1355        if (!chk_hit_marker(opt->pattern_expression))
1356                return 0;
1357
1358        return grep_source_1(opt, gs, 0);
1359}
1360
1361int grep_buffer(struct grep_opt *opt, char *buf, unsigned long size)
1362{
1363        struct grep_source gs;
1364        int r;
1365
1366        grep_source_init(&gs, GREP_SOURCE_BUF, NULL, NULL);
1367        gs.buf = buf;
1368        gs.size = size;
1369
1370        r = grep_source(opt, &gs);
1371
1372        grep_source_clear(&gs);
1373        return r;
1374}
1375
1376void grep_source_init(struct grep_source *gs, enum grep_source_type type,
1377                      const char *name, const void *identifier)
1378{
1379        gs->type = type;
1380        gs->name = name ? xstrdup(name) : NULL;
1381        gs->buf = NULL;
1382        gs->size = 0;
1383        gs->driver = NULL;
1384
1385        switch (type) {
1386        case GREP_SOURCE_FILE:
1387                gs->identifier = xstrdup(identifier);
1388                break;
1389        case GREP_SOURCE_SHA1:
1390                gs->identifier = xmalloc(20);
1391                memcpy(gs->identifier, identifier, 20);
1392                break;
1393        case GREP_SOURCE_BUF:
1394                gs->identifier = NULL;
1395        }
1396}
1397
1398void grep_source_clear(struct grep_source *gs)
1399{
1400        free(gs->name);
1401        gs->name = NULL;
1402        free(gs->identifier);
1403        gs->identifier = NULL;
1404        grep_source_clear_data(gs);
1405}
1406
1407void grep_source_clear_data(struct grep_source *gs)
1408{
1409        switch (gs->type) {
1410        case GREP_SOURCE_FILE:
1411        case GREP_SOURCE_SHA1:
1412                free(gs->buf);
1413                gs->buf = NULL;
1414                gs->size = 0;
1415                break;
1416        case GREP_SOURCE_BUF:
1417                /* leave user-provided buf intact */
1418                break;
1419        }
1420}
1421
1422static int grep_source_load_sha1(struct grep_source *gs)
1423{
1424        enum object_type type;
1425
1426        grep_read_lock();
1427        gs->buf = read_sha1_file(gs->identifier, &type, &gs->size);
1428        grep_read_unlock();
1429
1430        if (!gs->buf)
1431                return error(_("'%s': unable to read %s"),
1432                             gs->name,
1433                             sha1_to_hex(gs->identifier));
1434        return 0;
1435}
1436
1437static int grep_source_load_file(struct grep_source *gs)
1438{
1439        const char *filename = gs->identifier;
1440        struct stat st;
1441        char *data;
1442        size_t size;
1443        int i;
1444
1445        if (lstat(filename, &st) < 0) {
1446        err_ret:
1447                if (errno != ENOENT)
1448                        error(_("'%s': %s"), filename, strerror(errno));
1449                return -1;
1450        }
1451        if (!S_ISREG(st.st_mode))
1452                return -1;
1453        size = xsize_t(st.st_size);
1454        i = open(filename, O_RDONLY);
1455        if (i < 0)
1456                goto err_ret;
1457        data = xmalloc(size + 1);
1458        if (st.st_size != read_in_full(i, data, size)) {
1459                error(_("'%s': short read %s"), filename, strerror(errno));
1460                close(i);
1461                free(data);
1462                return -1;
1463        }
1464        close(i);
1465        data[size] = 0;
1466
1467        gs->buf = data;
1468        gs->size = size;
1469        return 0;
1470}
1471
1472static int grep_source_load(struct grep_source *gs)
1473{
1474        if (gs->buf)
1475                return 0;
1476
1477        switch (gs->type) {
1478        case GREP_SOURCE_FILE:
1479                return grep_source_load_file(gs);
1480        case GREP_SOURCE_SHA1:
1481                return grep_source_load_sha1(gs);
1482        case GREP_SOURCE_BUF:
1483                return gs->buf ? 0 : -1;
1484        }
1485        die("BUG: invalid grep_source type");
1486}
1487
1488void grep_source_load_driver(struct grep_source *gs)
1489{
1490        if (gs->driver)
1491                return;
1492
1493        grep_attr_lock();
1494        gs->driver = userdiff_find_by_path(gs->name);
1495        if (!gs->driver)
1496                gs->driver = userdiff_find_by_name("default");
1497        grep_attr_unlock();
1498}
1499
1500static int grep_source_is_binary(struct grep_source *gs)
1501{
1502        grep_source_load_driver(gs);
1503        if (gs->driver->binary != -1)
1504                return gs->driver->binary;
1505
1506        if (!grep_source_load(gs))
1507                return buffer_is_binary(gs->buf, gs->size);
1508
1509        return 0;
1510}