Andrew's git - gitweb.git/blob

be15c4753d9768820dc47e107b54f41523c13caf
   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 void compile_grep_patterns_real(struct grep_opt *opt)
 480{
 481        struct grep_pat *p;
 482        struct grep_expr *header_expr = prep_header_patterns(opt);
 483
 484        for (p = opt->pattern_list; p; p = p->next) {
 485                switch (p->token) {
 486                case GREP_PATTERN: /* atom */
 487                case GREP_PATTERN_HEAD:
 488                case GREP_PATTERN_BODY:
 489                        compile_regexp(p, opt);
 490                        break;
 491                default:
 492                        opt->extended = 1;
 493                        break;
 494                }
 495        }
 496
 497        if (opt->all_match || header_expr)
 498                opt->extended = 1;
 499        else if (!opt->extended && !opt->debug)
 500                return;
 501
 502        p = opt->pattern_list;
 503        if (p)
 504                opt->pattern_expression = compile_pattern_expr(&p);
 505        if (p)
 506                die("incomplete pattern expression: %s", p->pattern);
 507
 508        if (!header_expr)
 509                return;
 510
 511        if (!opt->pattern_expression)
 512                opt->pattern_expression = header_expr;
 513        else
 514                opt->pattern_expression = grep_or_expr(opt->pattern_expression,
 515                                                       header_expr);
 516        opt->all_match = 1;
 517}
 518
 519void compile_grep_patterns(struct grep_opt *opt)
 520{
 521        compile_grep_patterns_real(opt);
 522        if (opt->debug)
 523                dump_grep_expression(opt);
 524}
 525
 526static void free_pattern_expr(struct grep_expr *x)
 527{
 528        switch (x->node) {
 529        case GREP_NODE_TRUE:
 530        case GREP_NODE_ATOM:
 531                break;
 532        case GREP_NODE_NOT:
 533                free_pattern_expr(x->u.unary);
 534                break;
 535        case GREP_NODE_AND:
 536        case GREP_NODE_OR:
 537                free_pattern_expr(x->u.binary.left);
 538                free_pattern_expr(x->u.binary.right);
 539                break;
 540        }
 541        free(x);
 542}
 543
 544void free_grep_patterns(struct grep_opt *opt)
 545{
 546        struct grep_pat *p, *n;
 547
 548        for (p = opt->pattern_list; p; p = n) {
 549                n = p->next;
 550                switch (p->token) {
 551                case GREP_PATTERN: /* atom */
 552                case GREP_PATTERN_HEAD:
 553                case GREP_PATTERN_BODY:
 554                        if (p->kws)
 555                                kwsfree(p->kws);
 556                        else if (p->pcre_regexp)
 557                                free_pcre_regexp(p);
 558                        else
 559                                regfree(&p->regexp);
 560                        free(p->pattern);
 561                        break;
 562                default:
 563                        break;
 564                }
 565                free(p);
 566        }
 567
 568        if (!opt->extended)
 569                return;
 570        free_pattern_expr(opt->pattern_expression);
 571}
 572
 573static char *end_of_line(char *cp, unsigned long *left)
 574{
 575        unsigned long l = *left;
 576        while (l && *cp != '\n') {
 577                l--;
 578                cp++;
 579        }
 580        *left = l;
 581        return cp;
 582}
 583
 584static int word_char(char ch)
 585{
 586        return isalnum(ch) || ch == '_';
 587}
 588
 589static void output_color(struct grep_opt *opt, const void *data, size_t size,
 590                         const char *color)
 591{
 592        if (want_color(opt->color) && color && color[0]) {
 593                opt->output(opt, color, strlen(color));
 594                opt->output(opt, data, size);
 595                opt->output(opt, GIT_COLOR_RESET, strlen(GIT_COLOR_RESET));
 596        } else
 597                opt->output(opt, data, size);
 598}
 599
 600static void output_sep(struct grep_opt *opt, char sign)
 601{
 602        if (opt->null_following_name)
 603                opt->output(opt, "\0", 1);
 604        else
 605                output_color(opt, &sign, 1, opt->color_sep);
 606}
 607
 608static void show_name(struct grep_opt *opt, const char *name)
 609{
 610        output_color(opt, name, strlen(name), opt->color_filename);
 611        opt->output(opt, opt->null_following_name ? "\0" : "\n", 1);
 612}
 613
 614static int fixmatch(struct grep_pat *p, char *line, char *eol,
 615                    regmatch_t *match)
 616{
 617        struct kwsmatch kwsm;
 618        size_t offset = kwsexec(p->kws, line, eol - line, &kwsm);
 619        if (offset == -1) {
 620                match->rm_so = match->rm_eo = -1;
 621                return REG_NOMATCH;
 622        } else {
 623                match->rm_so = offset;
 624                match->rm_eo = match->rm_so + kwsm.size[0];
 625                return 0;
 626        }
 627}
 628
 629static int regmatch(const regex_t *preg, char *line, char *eol,
 630                    regmatch_t *match, int eflags)
 631{
 632#ifdef REG_STARTEND
 633        match->rm_so = 0;
 634        match->rm_eo = eol - line;
 635        eflags |= REG_STARTEND;
 636#endif
 637        return regexec(preg, line, 1, match, eflags);
 638}
 639
 640static int patmatch(struct grep_pat *p, char *line, char *eol,
 641                    regmatch_t *match, int eflags)
 642{
 643        int hit;
 644
 645        if (p->fixed)
 646                hit = !fixmatch(p, line, eol, match);
 647        else if (p->pcre_regexp)
 648                hit = !pcrematch(p, line, eol, match, eflags);
 649        else
 650                hit = !regmatch(&p->regexp, line, eol, match, eflags);
 651
 652        return hit;
 653}
 654
 655static int strip_timestamp(char *bol, char **eol_p)
 656{
 657        char *eol = *eol_p;
 658        int ch;
 659
 660        while (bol < --eol) {
 661                if (*eol != '>')
 662                        continue;
 663                *eol_p = ++eol;
 664                ch = *eol;
 665                *eol = '\0';
 666                return ch;
 667        }
 668        return 0;
 669}
 670
 671static struct {
 672        const char *field;
 673        size_t len;
 674} header_field[] = {
 675        { "author ", 7 },
 676        { "committer ", 10 },
 677};
 678
 679static int match_one_pattern(struct grep_pat *p, char *bol, char *eol,
 680                             enum grep_context ctx,
 681                             regmatch_t *pmatch, int eflags)
 682{
 683        int hit = 0;
 684        int saved_ch = 0;
 685        const char *start = bol;
 686
 687        if ((p->token != GREP_PATTERN) &&
 688            ((p->token == GREP_PATTERN_HEAD) != (ctx == GREP_CONTEXT_HEAD)))
 689                return 0;
 690
 691        if (p->token == GREP_PATTERN_HEAD) {
 692                const char *field;
 693                size_t len;
 694                assert(p->field < ARRAY_SIZE(header_field));
 695                field = header_field[p->field].field;
 696                len = header_field[p->field].len;
 697                if (strncmp(bol, field, len))
 698                        return 0;
 699                bol += len;
 700                saved_ch = strip_timestamp(bol, &eol);
 701        }
 702
 703 again:
 704        hit = patmatch(p, bol, eol, pmatch, eflags);
 705
 706        if (hit && p->word_regexp) {
 707                if ((pmatch[0].rm_so < 0) ||
 708                    (eol - bol) < pmatch[0].rm_so ||
 709                    (pmatch[0].rm_eo < 0) ||
 710                    (eol - bol) < pmatch[0].rm_eo)
 711                        die("regexp returned nonsense");
 712
 713                /* Match beginning must be either beginning of the
 714                 * line, or at word boundary (i.e. the last char must
 715                 * not be a word char).  Similarly, match end must be
 716                 * either end of the line, or at word boundary
 717                 * (i.e. the next char must not be a word char).
 718                 */
 719                if ( ((pmatch[0].rm_so == 0) ||
 720                      !word_char(bol[pmatch[0].rm_so-1])) &&
 721                     ((pmatch[0].rm_eo == (eol-bol)) ||
 722                      !word_char(bol[pmatch[0].rm_eo])) )
 723                        ;
 724                else
 725                        hit = 0;
 726
 727                /* Words consist of at least one character. */
 728                if (pmatch->rm_so == pmatch->rm_eo)
 729                        hit = 0;
 730
 731                if (!hit && pmatch[0].rm_so + bol + 1 < eol) {
 732                        /* There could be more than one match on the
 733                         * line, and the first match might not be
 734                         * strict word match.  But later ones could be!
 735                         * Forward to the next possible start, i.e. the
 736                         * next position following a non-word char.
 737                         */
 738                        bol = pmatch[0].rm_so + bol + 1;
 739                        while (word_char(bol[-1]) && bol < eol)
 740                                bol++;
 741                        eflags |= REG_NOTBOL;
 742                        if (bol < eol)
 743                                goto again;
 744                }
 745        }
 746        if (p->token == GREP_PATTERN_HEAD && saved_ch)
 747                *eol = saved_ch;
 748        if (hit) {
 749                pmatch[0].rm_so += bol - start;
 750                pmatch[0].rm_eo += bol - start;
 751        }
 752        return hit;
 753}
 754
 755static int match_expr_eval(struct grep_expr *x, char *bol, char *eol,
 756                           enum grep_context ctx, int collect_hits)
 757{
 758        int h = 0;
 759        regmatch_t match;
 760
 761        if (!x)
 762                die("Not a valid grep expression");
 763        switch (x->node) {
 764        case GREP_NODE_TRUE:
 765                h = 1;
 766                break;
 767        case GREP_NODE_ATOM:
 768                h = match_one_pattern(x->u.atom, bol, eol, ctx, &match, 0);
 769                break;
 770        case GREP_NODE_NOT:
 771                h = !match_expr_eval(x->u.unary, bol, eol, ctx, 0);
 772                break;
 773        case GREP_NODE_AND:
 774                if (!match_expr_eval(x->u.binary.left, bol, eol, ctx, 0))
 775                        return 0;
 776                h = match_expr_eval(x->u.binary.right, bol, eol, ctx, 0);
 777                break;
 778        case GREP_NODE_OR:
 779                if (!collect_hits)
 780                        return (match_expr_eval(x->u.binary.left,
 781                                                bol, eol, ctx, 0) ||
 782                                match_expr_eval(x->u.binary.right,
 783                                                bol, eol, ctx, 0));
 784                h = match_expr_eval(x->u.binary.left, bol, eol, ctx, 0);
 785                x->u.binary.left->hit |= h;
 786                h |= match_expr_eval(x->u.binary.right, bol, eol, ctx, 1);
 787                break;
 788        default:
 789                die("Unexpected node type (internal error) %d", x->node);
 790        }
 791        if (collect_hits)
 792                x->hit |= h;
 793        return h;
 794}
 795
 796static int match_expr(struct grep_opt *opt, char *bol, char *eol,
 797                      enum grep_context ctx, int collect_hits)
 798{
 799        struct grep_expr *x = opt->pattern_expression;
 800        return match_expr_eval(x, bol, eol, ctx, collect_hits);
 801}
 802
 803static int match_line(struct grep_opt *opt, char *bol, char *eol,
 804                      enum grep_context ctx, int collect_hits)
 805{
 806        struct grep_pat *p;
 807        regmatch_t match;
 808
 809        if (opt->extended)
 810                return match_expr(opt, bol, eol, ctx, collect_hits);
 811
 812        /* we do not call with collect_hits without being extended */
 813        for (p = opt->pattern_list; p; p = p->next) {
 814                if (match_one_pattern(p, bol, eol, ctx, &match, 0))
 815                        return 1;
 816        }
 817        return 0;
 818}
 819
 820static int match_next_pattern(struct grep_pat *p, char *bol, char *eol,
 821                              enum grep_context ctx,
 822                              regmatch_t *pmatch, int eflags)
 823{
 824        regmatch_t match;
 825
 826        if (!match_one_pattern(p, bol, eol, ctx, &match, eflags))
 827                return 0;
 828        if (match.rm_so < 0 || match.rm_eo < 0)
 829                return 0;
 830        if (pmatch->rm_so >= 0 && pmatch->rm_eo >= 0) {
 831                if (match.rm_so > pmatch->rm_so)
 832                        return 1;
 833                if (match.rm_so == pmatch->rm_so && match.rm_eo < pmatch->rm_eo)
 834                        return 1;
 835        }
 836        pmatch->rm_so = match.rm_so;
 837        pmatch->rm_eo = match.rm_eo;
 838        return 1;
 839}
 840
 841static int next_match(struct grep_opt *opt, char *bol, char *eol,
 842                      enum grep_context ctx, regmatch_t *pmatch, int eflags)
 843{
 844        struct grep_pat *p;
 845        int hit = 0;
 846
 847        pmatch->rm_so = pmatch->rm_eo = -1;
 848        if (bol < eol) {
 849                for (p = opt->pattern_list; p; p = p->next) {
 850                        switch (p->token) {
 851                        case GREP_PATTERN: /* atom */
 852                        case GREP_PATTERN_HEAD:
 853                        case GREP_PATTERN_BODY:
 854                                hit |= match_next_pattern(p, bol, eol, ctx,
 855                                                          pmatch, eflags);
 856                                break;
 857                        default:
 858                                break;
 859                        }
 860                }
 861        }
 862        return hit;
 863}
 864
 865static void show_line(struct grep_opt *opt, char *bol, char *eol,
 866                      const char *name, unsigned lno, char sign)
 867{
 868        int rest = eol - bol;
 869        char *line_color = NULL;
 870
 871        if (opt->file_break && opt->last_shown == 0) {
 872                if (opt->show_hunk_mark)
 873                        opt->output(opt, "\n", 1);
 874        } else if (opt->pre_context || opt->post_context || opt->funcbody) {
 875                if (opt->last_shown == 0) {
 876                        if (opt->show_hunk_mark) {
 877                                output_color(opt, "--", 2, opt->color_sep);
 878                                opt->output(opt, "\n", 1);
 879                        }
 880                } else if (lno > opt->last_shown + 1) {
 881                        output_color(opt, "--", 2, opt->color_sep);
 882                        opt->output(opt, "\n", 1);
 883                }
 884        }
 885        if (opt->heading && opt->last_shown == 0) {
 886                output_color(opt, name, strlen(name), opt->color_filename);
 887                opt->output(opt, "\n", 1);
 888        }
 889        opt->last_shown = lno;
 890
 891        if (!opt->heading && opt->pathname) {
 892                output_color(opt, name, strlen(name), opt->color_filename);
 893                output_sep(opt, sign);
 894        }
 895        if (opt->linenum) {
 896                char buf[32];
 897                snprintf(buf, sizeof(buf), "%d", lno);
 898                output_color(opt, buf, strlen(buf), opt->color_lineno);
 899                output_sep(opt, sign);
 900        }
 901        if (opt->color) {
 902                regmatch_t match;
 903                enum grep_context ctx = GREP_CONTEXT_BODY;
 904                int ch = *eol;
 905                int eflags = 0;
 906
 907                if (sign == ':')
 908                        line_color = opt->color_selected;
 909                else if (sign == '-')
 910                        line_color = opt->color_context;
 911                else if (sign == '=')
 912                        line_color = opt->color_function;
 913                *eol = '\0';
 914                while (next_match(opt, bol, eol, ctx, &match, eflags)) {
 915                        if (match.rm_so == match.rm_eo)
 916                                break;
 917
 918                        output_color(opt, bol, match.rm_so, line_color);
 919                        output_color(opt, bol + match.rm_so,
 920                                     match.rm_eo - match.rm_so,
 921                                     opt->color_match);
 922                        bol += match.rm_eo;
 923                        rest -= match.rm_eo;
 924                        eflags = REG_NOTBOL;
 925                }
 926                *eol = ch;
 927        }
 928        output_color(opt, bol, rest, line_color);
 929        opt->output(opt, "\n", 1);
 930}
 931
 932#ifndef NO_PTHREADS
 933int grep_use_locks;
 934
 935/*
 936 * This lock protects access to the gitattributes machinery, which is
 937 * not thread-safe.
 938 */
 939pthread_mutex_t grep_attr_mutex;
 940
 941static inline void grep_attr_lock(void)
 942{
 943        if (grep_use_locks)
 944                pthread_mutex_lock(&grep_attr_mutex);
 945}
 946
 947static inline void grep_attr_unlock(void)
 948{
 949        if (grep_use_locks)
 950                pthread_mutex_unlock(&grep_attr_mutex);
 951}
 952
 953/*
 954 * Same as git_attr_mutex, but protecting the thread-unsafe object db access.
 955 */
 956pthread_mutex_t grep_read_mutex;
 957
 958#else
 959#define grep_attr_lock()
 960#define grep_attr_unlock()
 961#endif
 962
 963static int match_funcname(struct grep_opt *opt, struct grep_source *gs, char *bol, char *eol)
 964{
 965        xdemitconf_t *xecfg = opt->priv;
 966        if (xecfg && !xecfg->find_func) {
 967                grep_source_load_driver(gs);
 968                if (gs->driver->funcname.pattern) {
 969                        const struct userdiff_funcname *pe = &gs->driver->funcname;
 970                        xdiff_set_find_func(xecfg, pe->pattern, pe->cflags);
 971                } else {
 972                        xecfg = opt->priv = NULL;
 973                }
 974        }
 975
 976        if (xecfg) {
 977                char buf[1];
 978                return xecfg->find_func(bol, eol - bol, buf, 1,
 979                                        xecfg->find_func_priv) >= 0;
 980        }
 981
 982        if (bol == eol)
 983                return 0;
 984        if (isalpha(*bol) || *bol == '_' || *bol == '$')
 985                return 1;
 986        return 0;
 987}
 988
 989static void show_funcname_line(struct grep_opt *opt, struct grep_source *gs,
 990                               char *bol, unsigned lno)
 991{
 992        while (bol > gs->buf) {
 993                char *eol = --bol;
 994
 995                while (bol > gs->buf && bol[-1] != '\n')
 996                        bol--;
 997                lno--;
 998
 999                if (lno <= opt->last_shown)
1000                        break;
1001
1002                if (match_funcname(opt, gs, bol, eol)) {
1003                        show_line(opt, bol, eol, gs->name, lno, '=');
1004                        break;
1005                }
1006        }
1007}
1008
1009static void show_pre_context(struct grep_opt *opt, struct grep_source *gs,
1010                             char *bol, char *end, unsigned lno)
1011{
1012        unsigned cur = lno, from = 1, funcname_lno = 0;
1013        int funcname_needed = !!opt->funcname;
1014
1015        if (opt->funcbody && !match_funcname(opt, gs, bol, end))
1016                funcname_needed = 2;
1017
1018        if (opt->pre_context < lno)
1019                from = lno - opt->pre_context;
1020        if (from <= opt->last_shown)
1021                from = opt->last_shown + 1;
1022
1023        /* Rewind. */
1024        while (bol > gs->buf &&
1025               cur > (funcname_needed == 2 ? opt->last_shown + 1 : from)) {
1026                char *eol = --bol;
1027
1028                while (bol > gs->buf && bol[-1] != '\n')
1029                        bol--;
1030                cur--;
1031                if (funcname_needed && match_funcname(opt, gs, bol, eol)) {
1032                        funcname_lno = cur;
1033                        funcname_needed = 0;
1034                }
1035        }
1036
1037        /* We need to look even further back to find a function signature. */
1038        if (opt->funcname && funcname_needed)
1039                show_funcname_line(opt, gs, bol, cur);
1040
1041        /* Back forward. */
1042        while (cur < lno) {
1043                char *eol = bol, sign = (cur == funcname_lno) ? '=' : '-';
1044
1045                while (*eol != '\n')
1046                        eol++;
1047                show_line(opt, bol, eol, gs->name, cur, sign);
1048                bol = eol + 1;
1049                cur++;
1050        }
1051}
1052
1053static int should_lookahead(struct grep_opt *opt)
1054{
1055        struct grep_pat *p;
1056
1057        if (opt->extended)
1058                return 0; /* punt for too complex stuff */
1059        if (opt->invert)
1060                return 0;
1061        for (p = opt->pattern_list; p; p = p->next) {
1062                if (p->token != GREP_PATTERN)
1063                        return 0; /* punt for "header only" and stuff */
1064        }
1065        return 1;
1066}
1067
1068static int look_ahead(struct grep_opt *opt,
1069                      unsigned long *left_p,
1070                      unsigned *lno_p,
1071                      char **bol_p)
1072{
1073        unsigned lno = *lno_p;
1074        char *bol = *bol_p;
1075        struct grep_pat *p;
1076        char *sp, *last_bol;
1077        regoff_t earliest = -1;
1078
1079        for (p = opt->pattern_list; p; p = p->next) {
1080                int hit;
1081                regmatch_t m;
1082
1083                hit = patmatch(p, bol, bol + *left_p, &m, 0);
1084                if (!hit || m.rm_so < 0 || m.rm_eo < 0)
1085                        continue;
1086                if (earliest < 0 || m.rm_so < earliest)
1087                        earliest = m.rm_so;
1088        }
1089
1090        if (earliest < 0) {
1091                *bol_p = bol + *left_p;
1092                *left_p = 0;
1093                return 1;
1094        }
1095        for (sp = bol + earliest; bol < sp && sp[-1] != '\n'; sp--)
1096                ; /* find the beginning of the line */
1097        last_bol = sp;
1098
1099        for (sp = bol; sp < last_bol; sp++) {
1100                if (*sp == '\n')
1101                        lno++;
1102        }
1103        *left_p -= last_bol - bol;
1104        *bol_p = last_bol;
1105        *lno_p = lno;
1106        return 0;
1107}
1108
1109static void std_output(struct grep_opt *opt, const void *buf, size_t size)
1110{
1111        fwrite(buf, size, 1, stdout);
1112}
1113
1114static int grep_source_1(struct grep_opt *opt, struct grep_source *gs, int collect_hits)
1115{
1116        char *bol;
1117        unsigned long left;
1118        unsigned lno = 1;
1119        unsigned last_hit = 0;
1120        int binary_match_only = 0;
1121        unsigned count = 0;
1122        int try_lookahead = 0;
1123        int show_function = 0;
1124        enum grep_context ctx = GREP_CONTEXT_HEAD;
1125        xdemitconf_t xecfg;
1126
1127        if (!opt->output)
1128                opt->output = std_output;
1129
1130        if (opt->pre_context || opt->post_context || opt->file_break ||
1131            opt->funcbody) {
1132                /* Show hunk marks, except for the first file. */
1133                if (opt->last_shown)
1134                        opt->show_hunk_mark = 1;
1135                /*
1136                 * If we're using threads then we can't easily identify
1137                 * the first file.  Always put hunk marks in that case
1138                 * and skip the very first one later in work_done().
1139                 */
1140                if (opt->output != std_output)
1141                        opt->show_hunk_mark = 1;
1142        }
1143        opt->last_shown = 0;
1144
1145        switch (opt->binary) {
1146        case GREP_BINARY_DEFAULT:
1147                if (grep_source_is_binary(gs))
1148                        binary_match_only = 1;
1149                break;
1150        case GREP_BINARY_NOMATCH:
1151                if (grep_source_is_binary(gs))
1152                        return 0; /* Assume unmatch */
1153                break;
1154        case GREP_BINARY_TEXT:
1155                break;
1156        default:
1157                die("bug: unknown binary handling mode");
1158        }
1159
1160        memset(&xecfg, 0, sizeof(xecfg));
1161        opt->priv = &xecfg;
1162
1163        try_lookahead = should_lookahead(opt);
1164
1165        if (grep_source_load(gs) < 0)
1166                return 0;
1167
1168        bol = gs->buf;
1169        left = gs->size;
1170        while (left) {
1171                char *eol, ch;
1172                int hit;
1173
1174                /*
1175                 * look_ahead() skips quickly to the line that possibly
1176                 * has the next hit; don't call it if we need to do
1177                 * something more than just skipping the current line
1178                 * in response to an unmatch for the current line.  E.g.
1179                 * inside a post-context window, we will show the current
1180                 * line as a context around the previous hit when it
1181                 * doesn't hit.
1182                 */
1183                if (try_lookahead
1184                    && !(last_hit
1185                         && (show_function ||
1186                             lno <= last_hit + opt->post_context))
1187                    && look_ahead(opt, &left, &lno, &bol))
1188                        break;
1189                eol = end_of_line(bol, &left);
1190                ch = *eol;
1191                *eol = 0;
1192
1193                if ((ctx == GREP_CONTEXT_HEAD) && (eol == bol))
1194                        ctx = GREP_CONTEXT_BODY;
1195
1196                hit = match_line(opt, bol, eol, ctx, collect_hits);
1197                *eol = ch;
1198
1199                if (collect_hits)
1200                        goto next_line;
1201
1202                /* "grep -v -e foo -e bla" should list lines
1203                 * that do not have either, so inversion should
1204                 * be done outside.
1205                 */
1206                if (opt->invert)
1207                        hit = !hit;
1208                if (opt->unmatch_name_only) {
1209                        if (hit)
1210                                return 0;
1211                        goto next_line;
1212                }
1213                if (hit) {
1214                        count++;
1215                        if (opt->status_only)
1216                                return 1;
1217                        if (opt->name_only) {
1218                                show_name(opt, gs->name);
1219                                return 1;
1220                        }
1221                        if (opt->count)
1222                                goto next_line;
1223                        if (binary_match_only) {
1224                                opt->output(opt, "Binary file ", 12);
1225                                output_color(opt, gs->name, strlen(gs->name),
1226                                             opt->color_filename);
1227                                opt->output(opt, " matches\n", 9);
1228                                return 1;
1229                        }
1230                        /* Hit at this line.  If we haven't shown the
1231                         * pre-context lines, we would need to show them.
1232                         */
1233                        if (opt->pre_context || opt->funcbody)
1234                                show_pre_context(opt, gs, bol, eol, lno);
1235                        else if (opt->funcname)
1236                                show_funcname_line(opt, gs, bol, lno);
1237                        show_line(opt, bol, eol, gs->name, lno, ':');
1238                        last_hit = lno;
1239                        if (opt->funcbody)
1240                                show_function = 1;
1241                        goto next_line;
1242                }
1243                if (show_function && match_funcname(opt, gs, bol, eol))
1244                        show_function = 0;
1245                if (show_function ||
1246                    (last_hit && lno <= last_hit + opt->post_context)) {
1247                        /* If the last hit is within the post context,
1248                         * we need to show this line.
1249                         */
1250                        show_line(opt, bol, eol, gs->name, lno, '-');
1251                }
1252
1253        next_line:
1254                bol = eol + 1;
1255                if (!left)
1256                        break;
1257                left--;
1258                lno++;
1259        }
1260
1261        if (collect_hits)
1262                return 0;
1263
1264        if (opt->status_only)
1265                return 0;
1266        if (opt->unmatch_name_only) {
1267                /* We did not see any hit, so we want to show this */
1268                show_name(opt, gs->name);
1269                return 1;
1270        }
1271
1272        xdiff_clear_find_func(&xecfg);
1273        opt->priv = NULL;
1274
1275        /* NEEDSWORK:
1276         * The real "grep -c foo *.c" gives many "bar.c:0" lines,
1277         * which feels mostly useless but sometimes useful.  Maybe
1278         * make it another option?  For now suppress them.
1279         */
1280        if (opt->count && count) {
1281                char buf[32];
1282                output_color(opt, gs->name, strlen(gs->name), opt->color_filename);
1283                output_sep(opt, ':');
1284                snprintf(buf, sizeof(buf), "%u\n", count);
1285                opt->output(opt, buf, strlen(buf));
1286                return 1;
1287        }
1288        return !!last_hit;
1289}
1290
1291static void clr_hit_marker(struct grep_expr *x)
1292{
1293        /* All-hit markers are meaningful only at the very top level
1294         * OR node.
1295         */
1296        while (1) {
1297                x->hit = 0;
1298                if (x->node != GREP_NODE_OR)
1299                        return;
1300                x->u.binary.left->hit = 0;
1301                x = x->u.binary.right;
1302        }
1303}
1304
1305static int chk_hit_marker(struct grep_expr *x)
1306{
1307        /* Top level nodes have hit markers.  See if they all are hits */
1308        while (1) {
1309                if (x->node != GREP_NODE_OR)
1310                        return x->hit;
1311                if (!x->u.binary.left->hit)
1312                        return 0;
1313                x = x->u.binary.right;
1314        }
1315}
1316
1317int grep_source(struct grep_opt *opt, struct grep_source *gs)
1318{
1319        /*
1320         * we do not have to do the two-pass grep when we do not check
1321         * buffer-wide "all-match".
1322         */
1323        if (!opt->all_match)
1324                return grep_source_1(opt, gs, 0);
1325
1326        /* Otherwise the toplevel "or" terms hit a bit differently.
1327         * We first clear hit markers from them.
1328         */
1329        clr_hit_marker(opt->pattern_expression);
1330        grep_source_1(opt, gs, 1);
1331
1332        if (!chk_hit_marker(opt->pattern_expression))
1333                return 0;
1334
1335        return grep_source_1(opt, gs, 0);
1336}
1337
1338int grep_buffer(struct grep_opt *opt, char *buf, unsigned long size)
1339{
1340        struct grep_source gs;
1341        int r;
1342
1343        grep_source_init(&gs, GREP_SOURCE_BUF, NULL, NULL);
1344        gs.buf = buf;
1345        gs.size = size;
1346
1347        r = grep_source(opt, &gs);
1348
1349        grep_source_clear(&gs);
1350        return r;
1351}
1352
1353void grep_source_init(struct grep_source *gs, enum grep_source_type type,
1354                      const char *name, const void *identifier)
1355{
1356        gs->type = type;
1357        gs->name = name ? xstrdup(name) : NULL;
1358        gs->buf = NULL;
1359        gs->size = 0;
1360        gs->driver = NULL;
1361
1362        switch (type) {
1363        case GREP_SOURCE_FILE:
1364                gs->identifier = xstrdup(identifier);
1365                break;
1366        case GREP_SOURCE_SHA1:
1367                gs->identifier = xmalloc(20);
1368                memcpy(gs->identifier, identifier, 20);
1369                break;
1370        case GREP_SOURCE_BUF:
1371                gs->identifier = NULL;
1372        }
1373}
1374
1375void grep_source_clear(struct grep_source *gs)
1376{
1377        free(gs->name);
1378        gs->name = NULL;
1379        free(gs->identifier);
1380        gs->identifier = NULL;
1381        grep_source_clear_data(gs);
1382}
1383
1384void grep_source_clear_data(struct grep_source *gs)
1385{
1386        switch (gs->type) {
1387        case GREP_SOURCE_FILE:
1388        case GREP_SOURCE_SHA1:
1389                free(gs->buf);
1390                gs->buf = NULL;
1391                gs->size = 0;
1392                break;
1393        case GREP_SOURCE_BUF:
1394                /* leave user-provided buf intact */
1395                break;
1396        }
1397}
1398
1399static int grep_source_load_sha1(struct grep_source *gs)
1400{
1401        enum object_type type;
1402
1403        grep_read_lock();
1404        gs->buf = read_sha1_file(gs->identifier, &type, &gs->size);
1405        grep_read_unlock();
1406
1407        if (!gs->buf)
1408                return error(_("'%s': unable to read %s"),
1409                             gs->name,
1410                             sha1_to_hex(gs->identifier));
1411        return 0;
1412}
1413
1414static int grep_source_load_file(struct grep_source *gs)
1415{
1416        const char *filename = gs->identifier;
1417        struct stat st;
1418        char *data;
1419        size_t size;
1420        int i;
1421
1422        if (lstat(filename, &st) < 0) {
1423        err_ret:
1424                if (errno != ENOENT)
1425                        error(_("'%s': %s"), filename, strerror(errno));
1426                return -1;
1427        }
1428        if (!S_ISREG(st.st_mode))
1429                return -1;
1430        size = xsize_t(st.st_size);
1431        i = open(filename, O_RDONLY);
1432        if (i < 0)
1433                goto err_ret;
1434        data = xmalloc(size + 1);
1435        if (st.st_size != read_in_full(i, data, size)) {
1436                error(_("'%s': short read %s"), filename, strerror(errno));
1437                close(i);
1438                free(data);
1439                return -1;
1440        }
1441        close(i);
1442        data[size] = 0;
1443
1444        gs->buf = data;
1445        gs->size = size;
1446        return 0;
1447}
1448
1449int grep_source_load(struct grep_source *gs)
1450{
1451        if (gs->buf)
1452                return 0;
1453
1454        switch (gs->type) {
1455        case GREP_SOURCE_FILE:
1456                return grep_source_load_file(gs);
1457        case GREP_SOURCE_SHA1:
1458                return grep_source_load_sha1(gs);
1459        case GREP_SOURCE_BUF:
1460                return gs->buf ? 0 : -1;
1461        }
1462        die("BUG: invalid grep_source type");
1463}
1464
1465void grep_source_load_driver(struct grep_source *gs)
1466{
1467        if (gs->driver)
1468                return;
1469
1470        grep_attr_lock();
1471        gs->driver = userdiff_find_by_path(gs->name);
1472        if (!gs->driver)
1473                gs->driver = userdiff_find_by_name("default");
1474        grep_attr_unlock();
1475}
1476
1477int grep_source_is_binary(struct grep_source *gs)
1478{
1479        grep_source_load_driver(gs);
1480        if (gs->driver->binary != -1)
1481                return gs->driver->binary;
1482
1483        if (!grep_source_load(gs))
1484                return buffer_is_binary(gs->buf, gs->size);
1485
1486        return 0;
1487}