Andrew's git / gitweb.git / grep.c
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grep.con commit log --grep/--author: honor --all-match honored for multiple --grep patterns (13e4fc7)
   1#include "cache.h"
   2#include "grep.h"
   3#include "userdiff.h"
   4#include "xdiff-interface.h"
   5
   6static struct grep_pat *create_grep_pat(const char *pat, size_t patlen,
   7                                        const char *origin, int no,
   8                                        enum grep_pat_token t,
   9                                        enum grep_header_field field)
  10{
  11        struct grep_pat *p = xcalloc(1, sizeof(*p));
  12        p->pattern = xmemdupz(pat, patlen);
  13        p->patternlen = patlen;
  14        p->origin = origin;
  15        p->no = no;
  16        p->token = t;
  17        p->field = field;
  18        return p;
  19}
  20
  21static void do_append_grep_pat(struct grep_pat ***tail, struct grep_pat *p)
  22{
  23        **tail = p;
  24        *tail = &p->next;
  25        p->next = NULL;
  26
  27        switch (p->token) {
  28        case GREP_PATTERN: /* atom */
  29        case GREP_PATTERN_HEAD:
  30        case GREP_PATTERN_BODY:
  31                for (;;) {
  32                        struct grep_pat *new_pat;
  33                        size_t len = 0;
  34                        char *cp = p->pattern + p->patternlen, *nl = NULL;
  35                        while (++len <= p->patternlen) {
  36                                if (*(--cp) == '\n') {
  37                                        nl = cp;
  38                                        break;
  39                                }
  40                        }
  41                        if (!nl)
  42                                break;
  43                        new_pat = create_grep_pat(nl + 1, len - 1, p->origin,
  44                                                  p->no, p->token, p->field);
  45                        new_pat->next = p->next;
  46                        if (!p->next)
  47                                *tail = &new_pat->next;
  48                        p->next = new_pat;
  49                        *nl = '\0';
  50                        p->patternlen -= len;
  51                }
  52                break;
  53        default:
  54                break;
  55        }
  56}
  57
  58void append_header_grep_pattern(struct grep_opt *opt,
  59                                enum grep_header_field field, const char *pat)
  60{
  61        struct grep_pat *p = create_grep_pat(pat, strlen(pat), "header", 0,
  62                                             GREP_PATTERN_HEAD, field);
  63        do_append_grep_pat(&opt->header_tail, p);
  64}
  65
  66void append_grep_pattern(struct grep_opt *opt, const char *pat,
  67                         const char *origin, int no, enum grep_pat_token t)
  68{
  69        append_grep_pat(opt, pat, strlen(pat), origin, no, t);
  70}
  71
  72void append_grep_pat(struct grep_opt *opt, const char *pat, size_t patlen,
  73                     const char *origin, int no, enum grep_pat_token t)
  74{
  75        struct grep_pat *p = create_grep_pat(pat, patlen, origin, no, t, 0);
  76        do_append_grep_pat(&opt->pattern_tail, p);
  77}
  78
  79struct grep_opt *grep_opt_dup(const struct grep_opt *opt)
  80{
  81        struct grep_pat *pat;
  82        struct grep_opt *ret = xmalloc(sizeof(struct grep_opt));
  83        *ret = *opt;
  84
  85        ret->pattern_list = NULL;
  86        ret->pattern_tail = &ret->pattern_list;
  87
  88        for(pat = opt->pattern_list; pat != NULL; pat = pat->next)
  89        {
  90                if(pat->token == GREP_PATTERN_HEAD)
  91                        append_header_grep_pattern(ret, pat->field,
  92                                                   pat->pattern);
  93                else
  94                        append_grep_pat(ret, pat->pattern, pat->patternlen,
  95                                        pat->origin, pat->no, pat->token);
  96        }
  97
  98        return ret;
  99}
 100
 101static NORETURN void compile_regexp_failed(const struct grep_pat *p,
 102                const char *error)
 103{
 104        char where[1024];
 105
 106        if (p->no)
 107                sprintf(where, "In '%s' at %d, ", p->origin, p->no);
 108        else if (p->origin)
 109                sprintf(where, "%s, ", p->origin);
 110        else
 111                where[0] = 0;
 112
 113        die("%s'%s': %s", where, p->pattern, error);
 114}
 115
 116#ifdef USE_LIBPCRE
 117static void compile_pcre_regexp(struct grep_pat *p, const struct grep_opt *opt)
 118{
 119        const char *error;
 120        int erroffset;
 121        int options = PCRE_MULTILINE;
 122
 123        if (opt->ignore_case)
 124                options |= PCRE_CASELESS;
 125
 126        p->pcre_regexp = pcre_compile(p->pattern, options, &error, &erroffset,
 127                        NULL);
 128        if (!p->pcre_regexp)
 129                compile_regexp_failed(p, error);
 130
 131        p->pcre_extra_info = pcre_study(p->pcre_regexp, 0, &error);
 132        if (!p->pcre_extra_info && error)
 133                die("%s", error);
 134}
 135
 136static int pcrematch(struct grep_pat *p, const char *line, const char *eol,
 137                regmatch_t *match, int eflags)
 138{
 139        int ovector[30], ret, flags = 0;
 140
 141        if (eflags & REG_NOTBOL)
 142                flags |= PCRE_NOTBOL;
 143
 144        ret = pcre_exec(p->pcre_regexp, p->pcre_extra_info, line, eol - line,
 145                        0, flags, ovector, ARRAY_SIZE(ovector));
 146        if (ret < 0 && ret != PCRE_ERROR_NOMATCH)
 147                die("pcre_exec failed with error code %d", ret);
 148        if (ret > 0) {
 149                ret = 0;
 150                match->rm_so = ovector[0];
 151                match->rm_eo = ovector[1];
 152        }
 153
 154        return ret;
 155}
 156
 157static void free_pcre_regexp(struct grep_pat *p)
 158{
 159        pcre_free(p->pcre_regexp);
 160        pcre_free(p->pcre_extra_info);
 161}
 162#else /* !USE_LIBPCRE */
 163static void compile_pcre_regexp(struct grep_pat *p, const struct grep_opt *opt)
 164{
 165        die("cannot use Perl-compatible regexes when not compiled with USE_LIBPCRE");
 166}
 167
 168static int pcrematch(struct grep_pat *p, const char *line, const char *eol,
 169                regmatch_t *match, int eflags)
 170{
 171        return 1;
 172}
 173
 174static void free_pcre_regexp(struct grep_pat *p)
 175{
 176}
 177#endif /* !USE_LIBPCRE */
 178
 179static int is_fixed(const char *s, size_t len)
 180{
 181        size_t i;
 182
 183        /* regcomp cannot accept patterns with NULs so we
 184         * consider any pattern containing a NUL fixed.
 185         */
 186        if (memchr(s, 0, len))
 187                return 1;
 188
 189        for (i = 0; i < len; i++) {
 190                if (is_regex_special(s[i]))
 191                        return 0;
 192        }
 193
 194        return 1;
 195}
 196
 197static void compile_regexp(struct grep_pat *p, struct grep_opt *opt)
 198{
 199        int err;
 200
 201        p->word_regexp = opt->word_regexp;
 202        p->ignore_case = opt->ignore_case;
 203
 204        if (opt->fixed || is_fixed(p->pattern, p->patternlen))
 205                p->fixed = 1;
 206        else
 207                p->fixed = 0;
 208
 209        if (p->fixed) {
 210                if (opt->regflags & REG_ICASE || p->ignore_case)
 211                        p->kws = kwsalloc(tolower_trans_tbl);
 212                else
 213                        p->kws = kwsalloc(NULL);
 214                kwsincr(p->kws, p->pattern, p->patternlen);
 215                kwsprep(p->kws);
 216                return;
 217        }
 218
 219        if (opt->pcre) {
 220                compile_pcre_regexp(p, opt);
 221                return;
 222        }
 223
 224        err = regcomp(&p->regexp, p->pattern, opt->regflags);
 225        if (err) {
 226                char errbuf[1024];
 227                regerror(err, &p->regexp, errbuf, 1024);
 228                regfree(&p->regexp);
 229                compile_regexp_failed(p, errbuf);
 230        }
 231}
 232
 233static struct grep_expr *compile_pattern_or(struct grep_pat **);
 234static struct grep_expr *compile_pattern_atom(struct grep_pat **list)
 235{
 236        struct grep_pat *p;
 237        struct grep_expr *x;
 238
 239        p = *list;
 240        if (!p)
 241                return NULL;
 242        switch (p->token) {
 243        case GREP_PATTERN: /* atom */
 244        case GREP_PATTERN_HEAD:
 245        case GREP_PATTERN_BODY:
 246                x = xcalloc(1, sizeof (struct grep_expr));
 247                x->node = GREP_NODE_ATOM;
 248                x->u.atom = p;
 249                *list = p->next;
 250                return x;
 251        case GREP_OPEN_PAREN:
 252                *list = p->next;
 253                x = compile_pattern_or(list);
 254                if (!*list || (*list)->token != GREP_CLOSE_PAREN)
 255                        die("unmatched parenthesis");
 256                *list = (*list)->next;
 257                return x;
 258        default:
 259                return NULL;
 260        }
 261}
 262
 263static struct grep_expr *compile_pattern_not(struct grep_pat **list)
 264{
 265        struct grep_pat *p;
 266        struct grep_expr *x;
 267
 268        p = *list;
 269        if (!p)
 270                return NULL;
 271        switch (p->token) {
 272        case GREP_NOT:
 273                if (!p->next)
 274                        die("--not not followed by pattern expression");
 275                *list = p->next;
 276                x = xcalloc(1, sizeof (struct grep_expr));
 277                x->node = GREP_NODE_NOT;
 278                x->u.unary = compile_pattern_not(list);
 279                if (!x->u.unary)
 280                        die("--not followed by non pattern expression");
 281                return x;
 282        default:
 283                return compile_pattern_atom(list);
 284        }
 285}
 286
 287static struct grep_expr *compile_pattern_and(struct grep_pat **list)
 288{
 289        struct grep_pat *p;
 290        struct grep_expr *x, *y, *z;
 291
 292        x = compile_pattern_not(list);
 293        p = *list;
 294        if (p && p->token == GREP_AND) {
 295                if (!p->next)
 296                        die("--and not followed by pattern expression");
 297                *list = p->next;
 298                y = compile_pattern_and(list);
 299                if (!y)
 300                        die("--and not followed by pattern expression");
 301                z = xcalloc(1, sizeof (struct grep_expr));
 302                z->node = GREP_NODE_AND;
 303                z->u.binary.left = x;
 304                z->u.binary.right = y;
 305                return z;
 306        }
 307        return x;
 308}
 309
 310static struct grep_expr *compile_pattern_or(struct grep_pat **list)
 311{
 312        struct grep_pat *p;
 313        struct grep_expr *x, *y, *z;
 314
 315        x = compile_pattern_and(list);
 316        p = *list;
 317        if (x && p && p->token != GREP_CLOSE_PAREN) {
 318                y = compile_pattern_or(list);
 319                if (!y)
 320                        die("not a pattern expression %s", p->pattern);
 321                z = xcalloc(1, sizeof (struct grep_expr));
 322                z->node = GREP_NODE_OR;
 323                z->u.binary.left = x;
 324                z->u.binary.right = y;
 325                return z;
 326        }
 327        return x;
 328}
 329
 330static struct grep_expr *compile_pattern_expr(struct grep_pat **list)
 331{
 332        return compile_pattern_or(list);
 333}
 334
 335static void indent(int in)
 336{
 337        while (in-- > 0)
 338                fputc(' ', stderr);
 339}
 340
 341static void dump_grep_pat(struct grep_pat *p)
 342{
 343        switch (p->token) {
 344        case GREP_AND: fprintf(stderr, "*and*"); break;
 345        case GREP_OPEN_PAREN: fprintf(stderr, "*(*"); break;
 346        case GREP_CLOSE_PAREN: fprintf(stderr, "*)*"); break;
 347        case GREP_NOT: fprintf(stderr, "*not*"); break;
 348        case GREP_OR: fprintf(stderr, "*or*"); break;
 349
 350        case GREP_PATTERN: fprintf(stderr, "pattern"); break;
 351        case GREP_PATTERN_HEAD: fprintf(stderr, "pattern_head"); break;
 352        case GREP_PATTERN_BODY: fprintf(stderr, "pattern_body"); break;
 353        }
 354
 355        switch (p->token) {
 356        default: break;
 357        case GREP_PATTERN_HEAD:
 358                fprintf(stderr, "<head %d>", p->field); break;
 359        case GREP_PATTERN_BODY:
 360                fprintf(stderr, "<body>"); break;
 361        }
 362        switch (p->token) {
 363        default: break;
 364        case GREP_PATTERN_HEAD:
 365        case GREP_PATTERN_BODY:
 366        case GREP_PATTERN:
 367                fprintf(stderr, "%.*s", (int)p->patternlen, p->pattern);
 368                break;
 369        }
 370        fputc('\n', stderr);
 371}
 372
 373static void dump_grep_expression_1(struct grep_expr *x, int in)
 374{
 375        indent(in);
 376        switch (x->node) {
 377        case GREP_NODE_TRUE:
 378                fprintf(stderr, "true\n");
 379                break;
 380        case GREP_NODE_ATOM:
 381                dump_grep_pat(x->u.atom);
 382                break;
 383        case GREP_NODE_NOT:
 384                fprintf(stderr, "(not\n");
 385                dump_grep_expression_1(x->u.unary, in+1);
 386                indent(in);
 387                fprintf(stderr, ")\n");
 388                break;
 389        case GREP_NODE_AND:
 390                fprintf(stderr, "(and\n");
 391                dump_grep_expression_1(x->u.binary.left, in+1);
 392                dump_grep_expression_1(x->u.binary.right, in+1);
 393                indent(in);
 394                fprintf(stderr, ")\n");
 395                break;
 396        case GREP_NODE_OR:
 397                fprintf(stderr, "(or\n");
 398                dump_grep_expression_1(x->u.binary.left, in+1);
 399                dump_grep_expression_1(x->u.binary.right, in+1);
 400                indent(in);
 401                fprintf(stderr, ")\n");
 402                break;
 403        }
 404}
 405
 406void dump_grep_expression(struct grep_opt *opt)
 407{
 408        struct grep_expr *x = opt->pattern_expression;
 409
 410        if (opt->all_match)
 411                fprintf(stderr, "[all-match]\n");
 412        dump_grep_expression_1(x, 0);
 413        fflush(NULL);
 414}
 415
 416static struct grep_expr *grep_true_expr(void)
 417{
 418        struct grep_expr *z = xcalloc(1, sizeof(*z));
 419        z->node = GREP_NODE_TRUE;
 420        return z;
 421}
 422
 423static struct grep_expr *grep_or_expr(struct grep_expr *left, struct grep_expr *right)
 424{
 425        struct grep_expr *z = xcalloc(1, sizeof(*z));
 426        z->node = GREP_NODE_OR;
 427        z->u.binary.left = left;
 428        z->u.binary.right = right;
 429        return z;
 430}
 431
 432static struct grep_expr *prep_header_patterns(struct grep_opt *opt)
 433{
 434        struct grep_pat *p;
 435        struct grep_expr *header_expr;
 436        struct grep_expr *(header_group[GREP_HEADER_FIELD_MAX]);
 437        enum grep_header_field fld;
 438
 439        if (!opt->header_list)
 440                return NULL;
 441
 442        for (p = opt->header_list; p; p = p->next) {
 443                if (p->token != GREP_PATTERN_HEAD)
 444                        die("bug: a non-header pattern in grep header list.");
 445                if (p->field < 0 || GREP_HEADER_FIELD_MAX <= p->field)
 446                        die("bug: unknown header field %d", p->field);
 447                compile_regexp(p, opt);
 448        }
 449
 450        for (fld = 0; fld < GREP_HEADER_FIELD_MAX; fld++)
 451                header_group[fld] = NULL;
 452
 453        for (p = opt->header_list; p; p = p->next) {
 454                struct grep_expr *h;
 455                struct grep_pat *pp = p;
 456
 457                h = compile_pattern_atom(&pp);
 458                if (!h || pp != p->next)
 459                        die("bug: malformed header expr");
 460                if (!header_group[p->field]) {
 461                        header_group[p->field] = h;
 462                        continue;
 463                }
 464                header_group[p->field] = grep_or_expr(h, header_group[p->field]);
 465        }
 466
 467        header_expr = NULL;
 468
 469        for (fld = 0; fld < GREP_HEADER_FIELD_MAX; fld++) {
 470                if (!header_group[fld])
 471                        continue;
 472                if (!header_expr)
 473                        header_expr = grep_true_expr();
 474                header_expr = grep_or_expr(header_group[fld], header_expr);
 475        }
 476        return header_expr;
 477}
 478
 479static struct grep_expr *grep_splice_or(struct grep_expr *x, struct grep_expr *y)
 480{
 481        struct grep_expr *z = x;
 482
 483        while (x) {
 484                assert(x->node == GREP_NODE_OR);
 485                if (x->u.binary.right &&
 486                    x->u.binary.right->node == GREP_NODE_TRUE) {
 487                        x->u.binary.right = y;
 488                        break;
 489                }
 490                x = x->u.binary.right;
 491        }
 492        return z;
 493}
 494
 495static void compile_grep_patterns_real(struct grep_opt *opt)
 496{
 497        struct grep_pat *p;
 498        struct grep_expr *header_expr = prep_header_patterns(opt);
 499
 500        for (p = opt->pattern_list; p; p = p->next) {
 501                switch (p->token) {
 502                case GREP_PATTERN: /* atom */
 503                case GREP_PATTERN_HEAD:
 504                case GREP_PATTERN_BODY:
 505                        compile_regexp(p, opt);
 506                        break;
 507                default:
 508                        opt->extended = 1;
 509                        break;
 510                }
 511        }
 512
 513        if (opt->all_match || header_expr)
 514                opt->extended = 1;
 515        else if (!opt->extended && !opt->debug)
 516                return;
 517
 518        p = opt->pattern_list;
 519        if (p)
 520                opt->pattern_expression = compile_pattern_expr(&p);
 521        if (p)
 522                die("incomplete pattern expression: %s", p->pattern);
 523
 524        if (!header_expr)
 525                return;
 526
 527        if (!opt->pattern_expression)
 528                opt->pattern_expression = header_expr;
 529        else if (opt->all_match)
 530                opt->pattern_expression = grep_splice_or(header_expr,
 531                                                         opt->pattern_expression);
 532        else
 533                opt->pattern_expression = grep_or_expr(opt->pattern_expression,
 534                                                       header_expr);
 535        opt->all_match = 1;
 536}
 537
 538void compile_grep_patterns(struct grep_opt *opt)
 539{
 540        compile_grep_patterns_real(opt);
 541        if (opt->debug)
 542                dump_grep_expression(opt);
 543}
 544
 545static void free_pattern_expr(struct grep_expr *x)
 546{
 547        switch (x->node) {
 548        case GREP_NODE_TRUE:
 549        case GREP_NODE_ATOM:
 550                break;
 551        case GREP_NODE_NOT:
 552                free_pattern_expr(x->u.unary);
 553                break;
 554        case GREP_NODE_AND:
 555        case GREP_NODE_OR:
 556                free_pattern_expr(x->u.binary.left);
 557                free_pattern_expr(x->u.binary.right);
 558                break;
 559        }
 560        free(x);
 561}
 562
 563void free_grep_patterns(struct grep_opt *opt)
 564{
 565        struct grep_pat *p, *n;
 566
 567        for (p = opt->pattern_list; p; p = n) {
 568                n = p->next;
 569                switch (p->token) {
 570                case GREP_PATTERN: /* atom */
 571                case GREP_PATTERN_HEAD:
 572                case GREP_PATTERN_BODY:
 573                        if (p->kws)
 574                                kwsfree(p->kws);
 575                        else if (p->pcre_regexp)
 576                                free_pcre_regexp(p);
 577                        else
 578                                regfree(&p->regexp);
 579                        free(p->pattern);
 580                        break;
 581                default:
 582                        break;
 583                }
 584                free(p);
 585        }
 586
 587        if (!opt->extended)
 588                return;
 589        free_pattern_expr(opt->pattern_expression);
 590}
 591
 592static char *end_of_line(char *cp, unsigned long *left)
 593{
 594        unsigned long l = *left;
 595        while (l && *cp != '\n') {
 596                l--;
 597                cp++;
 598        }
 599        *left = l;
 600        return cp;
 601}
 602
 603static int word_char(char ch)
 604{
 605        return isalnum(ch) || ch == '_';
 606}
 607
 608static void output_color(struct grep_opt *opt, const void *data, size_t size,
 609                         const char *color)
 610{
 611        if (want_color(opt->color) && color && color[0]) {
 612                opt->output(opt, color, strlen(color));
 613                opt->output(opt, data, size);
 614                opt->output(opt, GIT_COLOR_RESET, strlen(GIT_COLOR_RESET));
 615        } else
 616                opt->output(opt, data, size);
 617}
 618
 619static void output_sep(struct grep_opt *opt, char sign)
 620{
 621        if (opt->null_following_name)
 622                opt->output(opt, "\0", 1);
 623        else
 624                output_color(opt, &sign, 1, opt->color_sep);
 625}
 626
 627static void show_name(struct grep_opt *opt, const char *name)
 628{
 629        output_color(opt, name, strlen(name), opt->color_filename);
 630        opt->output(opt, opt->null_following_name ? "\0" : "\n", 1);
 631}
 632
 633static int fixmatch(struct grep_pat *p, char *line, char *eol,
 634                    regmatch_t *match)
 635{
 636        struct kwsmatch kwsm;
 637        size_t offset = kwsexec(p->kws, line, eol - line, &kwsm);
 638        if (offset == -1) {
 639                match->rm_so = match->rm_eo = -1;
 640                return REG_NOMATCH;
 641        } else {
 642                match->rm_so = offset;
 643                match->rm_eo = match->rm_so + kwsm.size[0];
 644                return 0;
 645        }
 646}
 647
 648static int regmatch(const regex_t *preg, char *line, char *eol,
 649                    regmatch_t *match, int eflags)
 650{
 651#ifdef REG_STARTEND
 652        match->rm_so = 0;
 653        match->rm_eo = eol - line;
 654        eflags |= REG_STARTEND;
 655#endif
 656        return regexec(preg, line, 1, match, eflags);
 657}
 658
 659static int patmatch(struct grep_pat *p, char *line, char *eol,
 660                    regmatch_t *match, int eflags)
 661{
 662        int hit;
 663
 664        if (p->fixed)
 665                hit = !fixmatch(p, line, eol, match);
 666        else if (p->pcre_regexp)
 667                hit = !pcrematch(p, line, eol, match, eflags);
 668        else
 669                hit = !regmatch(&p->regexp, line, eol, match, eflags);
 670
 671        return hit;
 672}
 673
 674static int strip_timestamp(char *bol, char **eol_p)
 675{
 676        char *eol = *eol_p;
 677        int ch;
 678
 679        while (bol < --eol) {
 680                if (*eol != '>')
 681                        continue;
 682                *eol_p = ++eol;
 683                ch = *eol;
 684                *eol = '\0';
 685                return ch;
 686        }
 687        return 0;
 688}
 689
 690static struct {
 691        const char *field;
 692        size_t len;
 693} header_field[] = {
 694        { "author ", 7 },
 695        { "committer ", 10 },
 696};
 697
 698static int match_one_pattern(struct grep_pat *p, char *bol, char *eol,
 699                             enum grep_context ctx,
 700                             regmatch_t *pmatch, int eflags)
 701{
 702        int hit = 0;
 703        int saved_ch = 0;
 704        const char *start = bol;
 705
 706        if ((p->token != GREP_PATTERN) &&
 707            ((p->token == GREP_PATTERN_HEAD) != (ctx == GREP_CONTEXT_HEAD)))
 708                return 0;
 709
 710        if (p->token == GREP_PATTERN_HEAD) {
 711                const char *field;
 712                size_t len;
 713                assert(p->field < ARRAY_SIZE(header_field));
 714                field = header_field[p->field].field;
 715                len = header_field[p->field].len;
 716                if (strncmp(bol, field, len))
 717                        return 0;
 718                bol += len;
 719                saved_ch = strip_timestamp(bol, &eol);
 720        }
 721
 722 again:
 723        hit = patmatch(p, bol, eol, pmatch, eflags);
 724
 725        if (hit && p->word_regexp) {
 726                if ((pmatch[0].rm_so < 0) ||
 727                    (eol - bol) < pmatch[0].rm_so ||
 728                    (pmatch[0].rm_eo < 0) ||
 729                    (eol - bol) < pmatch[0].rm_eo)
 730                        die("regexp returned nonsense");
 731
 732                /* Match beginning must be either beginning of the
 733                 * line, or at word boundary (i.e. the last char must
 734                 * not be a word char).  Similarly, match end must be
 735                 * either end of the line, or at word boundary
 736                 * (i.e. the next char must not be a word char).
 737                 */
 738                if ( ((pmatch[0].rm_so == 0) ||
 739                      !word_char(bol[pmatch[0].rm_so-1])) &&
 740                     ((pmatch[0].rm_eo == (eol-bol)) ||
 741                      !word_char(bol[pmatch[0].rm_eo])) )
 742                        ;
 743                else
 744                        hit = 0;
 745
 746                /* Words consist of at least one character. */
 747                if (pmatch->rm_so == pmatch->rm_eo)
 748                        hit = 0;
 749
 750                if (!hit && pmatch[0].rm_so + bol + 1 < eol) {
 751                        /* There could be more than one match on the
 752                         * line, and the first match might not be
 753                         * strict word match.  But later ones could be!
 754                         * Forward to the next possible start, i.e. the
 755                         * next position following a non-word char.
 756                         */
 757                        bol = pmatch[0].rm_so + bol + 1;
 758                        while (word_char(bol[-1]) && bol < eol)
 759                                bol++;
 760                        eflags |= REG_NOTBOL;
 761                        if (bol < eol)
 762                                goto again;
 763                }
 764        }
 765        if (p->token == GREP_PATTERN_HEAD && saved_ch)
 766                *eol = saved_ch;
 767        if (hit) {
 768                pmatch[0].rm_so += bol - start;
 769                pmatch[0].rm_eo += bol - start;
 770        }
 771        return hit;
 772}
 773
 774static int match_expr_eval(struct grep_expr *x, char *bol, char *eol,
 775                           enum grep_context ctx, int collect_hits)
 776{
 777        int h = 0;
 778        regmatch_t match;
 779
 780        if (!x)
 781                die("Not a valid grep expression");
 782        switch (x->node) {
 783        case GREP_NODE_TRUE:
 784                h = 1;
 785                break;
 786        case GREP_NODE_ATOM:
 787                h = match_one_pattern(x->u.atom, bol, eol, ctx, &match, 0);
 788                break;
 789        case GREP_NODE_NOT:
 790                h = !match_expr_eval(x->u.unary, bol, eol, ctx, 0);
 791                break;
 792        case GREP_NODE_AND:
 793                if (!match_expr_eval(x->u.binary.left, bol, eol, ctx, 0))
 794                        return 0;
 795                h = match_expr_eval(x->u.binary.right, bol, eol, ctx, 0);
 796                break;
 797        case GREP_NODE_OR:
 798                if (!collect_hits)
 799                        return (match_expr_eval(x->u.binary.left,
 800                                                bol, eol, ctx, 0) ||
 801                                match_expr_eval(x->u.binary.right,
 802                                                bol, eol, ctx, 0));
 803                h = match_expr_eval(x->u.binary.left, bol, eol, ctx, 0);
 804                x->u.binary.left->hit |= h;
 805                h |= match_expr_eval(x->u.binary.right, bol, eol, ctx, 1);
 806                break;
 807        default:
 808                die("Unexpected node type (internal error) %d", x->node);
 809        }
 810        if (collect_hits)
 811                x->hit |= h;
 812        return h;
 813}
 814
 815static int match_expr(struct grep_opt *opt, char *bol, char *eol,
 816                      enum grep_context ctx, int collect_hits)
 817{
 818        struct grep_expr *x = opt->pattern_expression;
 819        return match_expr_eval(x, bol, eol, ctx, collect_hits);
 820}
 821
 822static int match_line(struct grep_opt *opt, char *bol, char *eol,
 823                      enum grep_context ctx, int collect_hits)
 824{
 825        struct grep_pat *p;
 826        regmatch_t match;
 827
 828        if (opt->extended)
 829                return match_expr(opt, bol, eol, ctx, collect_hits);
 830
 831        /* we do not call with collect_hits without being extended */
 832        for (p = opt->pattern_list; p; p = p->next) {
 833                if (match_one_pattern(p, bol, eol, ctx, &match, 0))
 834                        return 1;
 835        }
 836        return 0;
 837}
 838
 839static int match_next_pattern(struct grep_pat *p, char *bol, char *eol,
 840                              enum grep_context ctx,
 841                              regmatch_t *pmatch, int eflags)
 842{
 843        regmatch_t match;
 844
 845        if (!match_one_pattern(p, bol, eol, ctx, &match, eflags))
 846                return 0;
 847        if (match.rm_so < 0 || match.rm_eo < 0)
 848                return 0;
 849        if (pmatch->rm_so >= 0 && pmatch->rm_eo >= 0) {
 850                if (match.rm_so > pmatch->rm_so)
 851                        return 1;
 852                if (match.rm_so == pmatch->rm_so && match.rm_eo < pmatch->rm_eo)
 853                        return 1;
 854        }
 855        pmatch->rm_so = match.rm_so;
 856        pmatch->rm_eo = match.rm_eo;
 857        return 1;
 858}
 859
 860static int next_match(struct grep_opt *opt, char *bol, char *eol,
 861                      enum grep_context ctx, regmatch_t *pmatch, int eflags)
 862{
 863        struct grep_pat *p;
 864        int hit = 0;
 865
 866        pmatch->rm_so = pmatch->rm_eo = -1;
 867        if (bol < eol) {
 868                for (p = opt->pattern_list; p; p = p->next) {
 869                        switch (p->token) {
 870                        case GREP_PATTERN: /* atom */
 871                        case GREP_PATTERN_HEAD:
 872                        case GREP_PATTERN_BODY:
 873                                hit |= match_next_pattern(p, bol, eol, ctx,
 874                                                          pmatch, eflags);
 875                                break;
 876                        default:
 877                                break;
 878                        }
 879                }
 880        }
 881        return hit;
 882}
 883
 884static void show_line(struct grep_opt *opt, char *bol, char *eol,
 885                      const char *name, unsigned lno, char sign)
 886{
 887        int rest = eol - bol;
 888        char *line_color = NULL;
 889
 890        if (opt->file_break && opt->last_shown == 0) {
 891                if (opt->show_hunk_mark)
 892                        opt->output(opt, "\n", 1);
 893        } else if (opt->pre_context || opt->post_context || opt->funcbody) {
 894                if (opt->last_shown == 0) {
 895                        if (opt->show_hunk_mark) {
 896                                output_color(opt, "--", 2, opt->color_sep);
 897                                opt->output(opt, "\n", 1);
 898                        }
 899                } else if (lno > opt->last_shown + 1) {
 900                        output_color(opt, "--", 2, opt->color_sep);
 901                        opt->output(opt, "\n", 1);
 902                }
 903        }
 904        if (opt->heading && opt->last_shown == 0) {
 905                output_color(opt, name, strlen(name), opt->color_filename);
 906                opt->output(opt, "\n", 1);
 907        }
 908        opt->last_shown = lno;
 909
 910        if (!opt->heading && opt->pathname) {
 911                output_color(opt, name, strlen(name), opt->color_filename);
 912                output_sep(opt, sign);
 913        }
 914        if (opt->linenum) {
 915                char buf[32];
 916                snprintf(buf, sizeof(buf), "%d", lno);
 917                output_color(opt, buf, strlen(buf), opt->color_lineno);
 918                output_sep(opt, sign);
 919        }
 920        if (opt->color) {
 921                regmatch_t match;
 922                enum grep_context ctx = GREP_CONTEXT_BODY;
 923                int ch = *eol;
 924                int eflags = 0;
 925
 926                if (sign == ':')
 927                        line_color = opt->color_selected;
 928                else if (sign == '-')
 929                        line_color = opt->color_context;
 930                else if (sign == '=')
 931                        line_color = opt->color_function;
 932                *eol = '\0';
 933                while (next_match(opt, bol, eol, ctx, &match, eflags)) {
 934                        if (match.rm_so == match.rm_eo)
 935                                break;
 936
 937                        output_color(opt, bol, match.rm_so, line_color);
 938                        output_color(opt, bol + match.rm_so,
 939                                     match.rm_eo - match.rm_so,
 940                                     opt->color_match);
 941                        bol += match.rm_eo;
 942                        rest -= match.rm_eo;
 943                        eflags = REG_NOTBOL;
 944                }
 945                *eol = ch;
 946        }
 947        output_color(opt, bol, rest, line_color);
 948        opt->output(opt, "\n", 1);
 949}
 950
 951#ifndef NO_PTHREADS
 952int grep_use_locks;
 953
 954/*
 955 * This lock protects access to the gitattributes machinery, which is
 956 * not thread-safe.
 957 */
 958pthread_mutex_t grep_attr_mutex;
 959
 960static inline void grep_attr_lock(void)
 961{
 962        if (grep_use_locks)
 963                pthread_mutex_lock(&grep_attr_mutex);
 964}
 965
 966static inline void grep_attr_unlock(void)
 967{
 968        if (grep_use_locks)
 969                pthread_mutex_unlock(&grep_attr_mutex);
 970}
 971
 972/*
 973 * Same as git_attr_mutex, but protecting the thread-unsafe object db access.
 974 */
 975pthread_mutex_t grep_read_mutex;
 976
 977#else
 978#define grep_attr_lock()
 979#define grep_attr_unlock()
 980#endif
 981
 982static int match_funcname(struct grep_opt *opt, struct grep_source *gs, char *bol, char *eol)
 983{
 984        xdemitconf_t *xecfg = opt->priv;
 985        if (xecfg && !xecfg->find_func) {
 986                grep_source_load_driver(gs);
 987                if (gs->driver->funcname.pattern) {
 988                        const struct userdiff_funcname *pe = &gs->driver->funcname;
 989                        xdiff_set_find_func(xecfg, pe->pattern, pe->cflags);
 990                } else {
 991                        xecfg = opt->priv = NULL;
 992                }
 993        }
 994
 995        if (xecfg) {
 996                char buf[1];
 997                return xecfg->find_func(bol, eol - bol, buf, 1,
 998                                        xecfg->find_func_priv) >= 0;
 999        }
1000
1001        if (bol == eol)
1002                return 0;
1003        if (isalpha(*bol) || *bol == '_' || *bol == '$')
1004                return 1;
1005        return 0;
1006}
1007
1008static void show_funcname_line(struct grep_opt *opt, struct grep_source *gs,
1009                               char *bol, unsigned lno)
1010{
1011        while (bol > gs->buf) {
1012                char *eol = --bol;
1013
1014                while (bol > gs->buf && bol[-1] != '\n')
1015                        bol--;
1016                lno--;
1017
1018                if (lno <= opt->last_shown)
1019                        break;
1020
1021                if (match_funcname(opt, gs, bol, eol)) {
1022                        show_line(opt, bol, eol, gs->name, lno, '=');
1023                        break;
1024                }
1025        }
1026}
1027
1028static void show_pre_context(struct grep_opt *opt, struct grep_source *gs,
1029                             char *bol, char *end, unsigned lno)
1030{
1031        unsigned cur = lno, from = 1, funcname_lno = 0;
1032        int funcname_needed = !!opt->funcname;
1033
1034        if (opt->funcbody && !match_funcname(opt, gs, bol, end))
1035                funcname_needed = 2;
1036
1037        if (opt->pre_context < lno)
1038                from = lno - opt->pre_context;
1039        if (from <= opt->last_shown)
1040                from = opt->last_shown + 1;
1041
1042        /* Rewind. */
1043        while (bol > gs->buf &&
1044               cur > (funcname_needed == 2 ? opt->last_shown + 1 : from)) {
1045                char *eol = --bol;
1046
1047                while (bol > gs->buf && bol[-1] != '\n')
1048                        bol--;
1049                cur--;
1050                if (funcname_needed && match_funcname(opt, gs, bol, eol)) {
1051                        funcname_lno = cur;
1052                        funcname_needed = 0;
1053                }
1054        }
1055
1056        /* We need to look even further back to find a function signature. */
1057        if (opt->funcname && funcname_needed)
1058                show_funcname_line(opt, gs, bol, cur);
1059
1060        /* Back forward. */
1061        while (cur < lno) {
1062                char *eol = bol, sign = (cur == funcname_lno) ? '=' : '-';
1063
1064                while (*eol != '\n')
1065                        eol++;
1066                show_line(opt, bol, eol, gs->name, cur, sign);
1067                bol = eol + 1;
1068                cur++;
1069        }
1070}
1071
1072static int should_lookahead(struct grep_opt *opt)
1073{
1074        struct grep_pat *p;
1075
1076        if (opt->extended)
1077                return 0; /* punt for too complex stuff */
1078        if (opt->invert)
1079                return 0;
1080        for (p = opt->pattern_list; p; p = p->next) {
1081                if (p->token != GREP_PATTERN)
1082                        return 0; /* punt for "header only" and stuff */
1083        }
1084        return 1;
1085}
1086
1087static int look_ahead(struct grep_opt *opt,
1088                      unsigned long *left_p,
1089                      unsigned *lno_p,
1090                      char **bol_p)
1091{
1092        unsigned lno = *lno_p;
1093        char *bol = *bol_p;
1094        struct grep_pat *p;
1095        char *sp, *last_bol;
1096        regoff_t earliest = -1;
1097
1098        for (p = opt->pattern_list; p; p = p->next) {
1099                int hit;
1100                regmatch_t m;
1101
1102                hit = patmatch(p, bol, bol + *left_p, &m, 0);
1103                if (!hit || m.rm_so < 0 || m.rm_eo < 0)
1104                        continue;
1105                if (earliest < 0 || m.rm_so < earliest)
1106                        earliest = m.rm_so;
1107        }
1108
1109        if (earliest < 0) {
1110                *bol_p = bol + *left_p;
1111                *left_p = 0;
1112                return 1;
1113        }
1114        for (sp = bol + earliest; bol < sp && sp[-1] != '\n'; sp--)
1115                ; /* find the beginning of the line */
1116        last_bol = sp;
1117
1118        for (sp = bol; sp < last_bol; sp++) {
1119                if (*sp == '\n')
1120                        lno++;
1121        }
1122        *left_p -= last_bol - bol;
1123        *bol_p = last_bol;
1124        *lno_p = lno;
1125        return 0;
1126}
1127
1128static void std_output(struct grep_opt *opt, const void *buf, size_t size)
1129{
1130        fwrite(buf, size, 1, stdout);
1131}
1132
1133static int grep_source_1(struct grep_opt *opt, struct grep_source *gs, int collect_hits)
1134{
1135        char *bol;
1136        unsigned long left;
1137        unsigned lno = 1;
1138        unsigned last_hit = 0;
1139        int binary_match_only = 0;
1140        unsigned count = 0;
1141        int try_lookahead = 0;
1142        int show_function = 0;
1143        enum grep_context ctx = GREP_CONTEXT_HEAD;
1144        xdemitconf_t xecfg;
1145
1146        if (!opt->output)
1147                opt->output = std_output;
1148
1149        if (opt->pre_context || opt->post_context || opt->file_break ||
1150            opt->funcbody) {
1151                /* Show hunk marks, except for the first file. */
1152                if (opt->last_shown)
1153                        opt->show_hunk_mark = 1;
1154                /*
1155                 * If we're using threads then we can't easily identify
1156                 * the first file.  Always put hunk marks in that case
1157                 * and skip the very first one later in work_done().
1158                 */
1159                if (opt->output != std_output)
1160                        opt->show_hunk_mark = 1;
1161        }
1162        opt->last_shown = 0;
1163
1164        switch (opt->binary) {
1165        case GREP_BINARY_DEFAULT:
1166                if (grep_source_is_binary(gs))
1167                        binary_match_only = 1;
1168                break;
1169        case GREP_BINARY_NOMATCH:
1170                if (grep_source_is_binary(gs))
1171                        return 0; /* Assume unmatch */
1172                break;
1173        case GREP_BINARY_TEXT:
1174                break;
1175        default:
1176                die("bug: unknown binary handling mode");
1177        }
1178
1179        memset(&xecfg, 0, sizeof(xecfg));
1180        opt->priv = &xecfg;
1181
1182        try_lookahead = should_lookahead(opt);
1183
1184        if (grep_source_load(gs) < 0)
1185                return 0;
1186
1187        bol = gs->buf;
1188        left = gs->size;
1189        while (left) {
1190                char *eol, ch;
1191                int hit;
1192
1193                /*
1194                 * look_ahead() skips quickly to the line that possibly
1195                 * has the next hit; don't call it if we need to do
1196                 * something more than just skipping the current line
1197                 * in response to an unmatch for the current line.  E.g.
1198                 * inside a post-context window, we will show the current
1199                 * line as a context around the previous hit when it
1200                 * doesn't hit.
1201                 */
1202                if (try_lookahead
1203                    && !(last_hit
1204                         && (show_function ||
1205                             lno <= last_hit + opt->post_context))
1206                    && look_ahead(opt, &left, &lno, &bol))
1207                        break;
1208                eol = end_of_line(bol, &left);
1209                ch = *eol;
1210                *eol = 0;
1211
1212                if ((ctx == GREP_CONTEXT_HEAD) && (eol == bol))
1213                        ctx = GREP_CONTEXT_BODY;
1214
1215                hit = match_line(opt, bol, eol, ctx, collect_hits);
1216                *eol = ch;
1217
1218                if (collect_hits)
1219                        goto next_line;
1220
1221                /* "grep -v -e foo -e bla" should list lines
1222                 * that do not have either, so inversion should
1223                 * be done outside.
1224                 */
1225                if (opt->invert)
1226                        hit = !hit;
1227                if (opt->unmatch_name_only) {
1228                        if (hit)
1229                                return 0;
1230                        goto next_line;
1231                }
1232                if (hit) {
1233                        count++;
1234                        if (opt->status_only)
1235                                return 1;
1236                        if (opt->name_only) {
1237                                show_name(opt, gs->name);
1238                                return 1;
1239                        }
1240                        if (opt->count)
1241                                goto next_line;
1242                        if (binary_match_only) {
1243                                opt->output(opt, "Binary file ", 12);
1244                                output_color(opt, gs->name, strlen(gs->name),
1245                                             opt->color_filename);
1246                                opt->output(opt, " matches\n", 9);
1247                                return 1;
1248                        }
1249                        /* Hit at this line.  If we haven't shown the
1250                         * pre-context lines, we would need to show them.
1251                         */
1252                        if (opt->pre_context || opt->funcbody)
1253                                show_pre_context(opt, gs, bol, eol, lno);
1254                        else if (opt->funcname)
1255                                show_funcname_line(opt, gs, bol, lno);
1256                        show_line(opt, bol, eol, gs->name, lno, ':');
1257                        last_hit = lno;
1258                        if (opt->funcbody)
1259                                show_function = 1;
1260                        goto next_line;
1261                }
1262                if (show_function && match_funcname(opt, gs, bol, eol))
1263                        show_function = 0;
1264                if (show_function ||
1265                    (last_hit && lno <= last_hit + opt->post_context)) {
1266                        /* If the last hit is within the post context,
1267                         * we need to show this line.
1268                         */
1269                        show_line(opt, bol, eol, gs->name, lno, '-');
1270                }
1271
1272        next_line:
1273                bol = eol + 1;
1274                if (!left)
1275                        break;
1276                left--;
1277                lno++;
1278        }
1279
1280        if (collect_hits)
1281                return 0;
1282
1283        if (opt->status_only)
1284                return 0;
1285        if (opt->unmatch_name_only) {
1286                /* We did not see any hit, so we want to show this */
1287                show_name(opt, gs->name);
1288                return 1;
1289        }
1290
1291        xdiff_clear_find_func(&xecfg);
1292        opt->priv = NULL;
1293
1294        /* NEEDSWORK:
1295         * The real "grep -c foo *.c" gives many "bar.c:0" lines,
1296         * which feels mostly useless but sometimes useful.  Maybe
1297         * make it another option?  For now suppress them.
1298         */
1299        if (opt->count && count) {
1300                char buf[32];
1301                output_color(opt, gs->name, strlen(gs->name), opt->color_filename);
1302                output_sep(opt, ':');
1303                snprintf(buf, sizeof(buf), "%u\n", count);
1304                opt->output(opt, buf, strlen(buf));
1305                return 1;
1306        }
1307        return !!last_hit;
1308}
1309
1310static void clr_hit_marker(struct grep_expr *x)
1311{
1312        /* All-hit markers are meaningful only at the very top level
1313         * OR node.
1314         */
1315        while (1) {
1316                x->hit = 0;
1317                if (x->node != GREP_NODE_OR)
1318                        return;
1319                x->u.binary.left->hit = 0;
1320                x = x->u.binary.right;
1321        }
1322}
1323
1324static int chk_hit_marker(struct grep_expr *x)
1325{
1326        /* Top level nodes have hit markers.  See if they all are hits */
1327        while (1) {
1328                if (x->node != GREP_NODE_OR)
1329                        return x->hit;
1330                if (!x->u.binary.left->hit)
1331                        return 0;
1332                x = x->u.binary.right;
1333        }
1334}
1335
1336int grep_source(struct grep_opt *opt, struct grep_source *gs)
1337{
1338        /*
1339         * we do not have to do the two-pass grep when we do not check
1340         * buffer-wide "all-match".
1341         */
1342        if (!opt->all_match)
1343                return grep_source_1(opt, gs, 0);
1344
1345        /* Otherwise the toplevel "or" terms hit a bit differently.
1346         * We first clear hit markers from them.
1347         */
1348        clr_hit_marker(opt->pattern_expression);
1349        grep_source_1(opt, gs, 1);
1350
1351        if (!chk_hit_marker(opt->pattern_expression))
1352                return 0;
1353
1354        return grep_source_1(opt, gs, 0);
1355}
1356
1357int grep_buffer(struct grep_opt *opt, char *buf, unsigned long size)
1358{
1359        struct grep_source gs;
1360        int r;
1361
1362        grep_source_init(&gs, GREP_SOURCE_BUF, NULL, NULL);
1363        gs.buf = buf;
1364        gs.size = size;
1365
1366        r = grep_source(opt, &gs);
1367
1368        grep_source_clear(&gs);
1369        return r;
1370}
1371
1372void grep_source_init(struct grep_source *gs, enum grep_source_type type,
1373                      const char *name, const void *identifier)
1374{
1375        gs->type = type;
1376        gs->name = name ? xstrdup(name) : NULL;
1377        gs->buf = NULL;
1378        gs->size = 0;
1379        gs->driver = NULL;
1380
1381        switch (type) {
1382        case GREP_SOURCE_FILE:
1383                gs->identifier = xstrdup(identifier);
1384                break;
1385        case GREP_SOURCE_SHA1:
1386                gs->identifier = xmalloc(20);
1387                memcpy(gs->identifier, identifier, 20);
1388                break;
1389        case GREP_SOURCE_BUF:
1390                gs->identifier = NULL;
1391        }
1392}
1393
1394void grep_source_clear(struct grep_source *gs)
1395{
1396        free(gs->name);
1397        gs->name = NULL;
1398        free(gs->identifier);
1399        gs->identifier = NULL;
1400        grep_source_clear_data(gs);
1401}
1402
1403void grep_source_clear_data(struct grep_source *gs)
1404{
1405        switch (gs->type) {
1406        case GREP_SOURCE_FILE:
1407        case GREP_SOURCE_SHA1:
1408                free(gs->buf);
1409                gs->buf = NULL;
1410                gs->size = 0;
1411                break;
1412        case GREP_SOURCE_BUF:
1413                /* leave user-provided buf intact */
1414                break;
1415        }
1416}
1417
1418static int grep_source_load_sha1(struct grep_source *gs)
1419{
1420        enum object_type type;
1421
1422        grep_read_lock();
1423        gs->buf = read_sha1_file(gs->identifier, &type, &gs->size);
1424        grep_read_unlock();
1425
1426        if (!gs->buf)
1427                return error(_("'%s': unable to read %s"),
1428                             gs->name,
1429                             sha1_to_hex(gs->identifier));
1430        return 0;
1431}
1432
1433static int grep_source_load_file(struct grep_source *gs)
1434{
1435        const char *filename = gs->identifier;
1436        struct stat st;
1437        char *data;
1438        size_t size;
1439        int i;
1440
1441        if (lstat(filename, &st) < 0) {
1442        err_ret:
1443                if (errno != ENOENT)
1444                        error(_("'%s': %s"), filename, strerror(errno));
1445                return -1;
1446        }
1447        if (!S_ISREG(st.st_mode))
1448                return -1;
1449        size = xsize_t(st.st_size);
1450        i = open(filename, O_RDONLY);
1451        if (i < 0)
1452                goto err_ret;
1453        data = xmalloc(size + 1);
1454        if (st.st_size != read_in_full(i, data, size)) {
1455                error(_("'%s': short read %s"), filename, strerror(errno));
1456                close(i);
1457                free(data);
1458                return -1;
1459        }
1460        close(i);
1461        data[size] = 0;
1462
1463        gs->buf = data;
1464        gs->size = size;
1465        return 0;
1466}
1467
1468int grep_source_load(struct grep_source *gs)
1469{
1470        if (gs->buf)
1471                return 0;
1472
1473        switch (gs->type) {
1474        case GREP_SOURCE_FILE:
1475                return grep_source_load_file(gs);
1476        case GREP_SOURCE_SHA1:
1477                return grep_source_load_sha1(gs);
1478        case GREP_SOURCE_BUF:
1479                return gs->buf ? 0 : -1;
1480        }
1481        die("BUG: invalid grep_source type");
1482}
1483
1484void grep_source_load_driver(struct grep_source *gs)
1485{
1486        if (gs->driver)
1487                return;
1488
1489        grep_attr_lock();
1490        gs->driver = userdiff_find_by_path(gs->name);
1491        if (!gs->driver)
1492                gs->driver = userdiff_find_by_name("default");
1493        grep_attr_unlock();
1494}
1495
1496int grep_source_is_binary(struct grep_source *gs)
1497{
1498        grep_source_load_driver(gs);
1499        if (gs->driver->binary != -1)
1500                return gs->driver->binary;
1501
1502        if (!grep_source_load(gs))
1503                return buffer_is_binary(gs->buf, gs->size);
1504
1505        return 0;
1506}