Andrew's git / gitweb.git / grep.c
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grep.con commit Merge branch 'da/mergetools-p4' into maint (6c95f53)
   1#include "cache.h"
   2#include "grep.h"
   3#include "userdiff.h"
   4#include "xdiff-interface.h"
   5
   6static int grep_source_load(struct grep_source *gs);
   7static int grep_source_is_binary(struct grep_source *gs);
   8
   9
  10static struct grep_pat *create_grep_pat(const char *pat, size_t patlen,
  11                                        const char *origin, int no,
  12                                        enum grep_pat_token t,
  13                                        enum grep_header_field field)
  14{
  15        struct grep_pat *p = xcalloc(1, sizeof(*p));
  16        p->pattern = xmemdupz(pat, patlen);
  17        p->patternlen = patlen;
  18        p->origin = origin;
  19        p->no = no;
  20        p->token = t;
  21        p->field = field;
  22        return p;
  23}
  24
  25static void do_append_grep_pat(struct grep_pat ***tail, struct grep_pat *p)
  26{
  27        **tail = p;
  28        *tail = &p->next;
  29        p->next = NULL;
  30
  31        switch (p->token) {
  32        case GREP_PATTERN: /* atom */
  33        case GREP_PATTERN_HEAD:
  34        case GREP_PATTERN_BODY:
  35                for (;;) {
  36                        struct grep_pat *new_pat;
  37                        size_t len = 0;
  38                        char *cp = p->pattern + p->patternlen, *nl = NULL;
  39                        while (++len <= p->patternlen) {
  40                                if (*(--cp) == '\n') {
  41                                        nl = cp;
  42                                        break;
  43                                }
  44                        }
  45                        if (!nl)
  46                                break;
  47                        new_pat = create_grep_pat(nl + 1, len - 1, p->origin,
  48                                                  p->no, p->token, p->field);
  49                        new_pat->next = p->next;
  50                        if (!p->next)
  51                                *tail = &new_pat->next;
  52                        p->next = new_pat;
  53                        *nl = '\0';
  54                        p->patternlen -= len;
  55                }
  56                break;
  57        default:
  58                break;
  59        }
  60}
  61
  62void append_header_grep_pattern(struct grep_opt *opt,
  63                                enum grep_header_field field, const char *pat)
  64{
  65        struct grep_pat *p = create_grep_pat(pat, strlen(pat), "header", 0,
  66                                             GREP_PATTERN_HEAD, field);
  67        if (field == GREP_HEADER_REFLOG)
  68                opt->use_reflog_filter = 1;
  69        do_append_grep_pat(&opt->header_tail, p);
  70}
  71
  72void append_grep_pattern(struct grep_opt *opt, const char *pat,
  73                         const char *origin, int no, enum grep_pat_token t)
  74{
  75        append_grep_pat(opt, pat, strlen(pat), origin, no, t);
  76}
  77
  78void append_grep_pat(struct grep_opt *opt, const char *pat, size_t patlen,
  79                     const char *origin, int no, enum grep_pat_token t)
  80{
  81        struct grep_pat *p = create_grep_pat(pat, patlen, origin, no, t, 0);
  82        do_append_grep_pat(&opt->pattern_tail, p);
  83}
  84
  85struct grep_opt *grep_opt_dup(const struct grep_opt *opt)
  86{
  87        struct grep_pat *pat;
  88        struct grep_opt *ret = xmalloc(sizeof(struct grep_opt));
  89        *ret = *opt;
  90
  91        ret->pattern_list = NULL;
  92        ret->pattern_tail = &ret->pattern_list;
  93
  94        for(pat = opt->pattern_list; pat != NULL; pat = pat->next)
  95        {
  96                if(pat->token == GREP_PATTERN_HEAD)
  97                        append_header_grep_pattern(ret, pat->field,
  98                                                   pat->pattern);
  99                else
 100                        append_grep_pat(ret, pat->pattern, pat->patternlen,
 101                                        pat->origin, pat->no, pat->token);
 102        }
 103
 104        return ret;
 105}
 106
 107static NORETURN void compile_regexp_failed(const struct grep_pat *p,
 108                const char *error)
 109{
 110        char where[1024];
 111
 112        if (p->no)
 113                sprintf(where, "In '%s' at %d, ", p->origin, p->no);
 114        else if (p->origin)
 115                sprintf(where, "%s, ", p->origin);
 116        else
 117                where[0] = 0;
 118
 119        die("%s'%s': %s", where, p->pattern, error);
 120}
 121
 122#ifdef USE_LIBPCRE
 123static void compile_pcre_regexp(struct grep_pat *p, const struct grep_opt *opt)
 124{
 125        const char *error;
 126        int erroffset;
 127        int options = PCRE_MULTILINE;
 128
 129        if (opt->ignore_case)
 130                options |= PCRE_CASELESS;
 131
 132        p->pcre_regexp = pcre_compile(p->pattern, options, &error, &erroffset,
 133                        NULL);
 134        if (!p->pcre_regexp)
 135                compile_regexp_failed(p, error);
 136
 137        p->pcre_extra_info = pcre_study(p->pcre_regexp, 0, &error);
 138        if (!p->pcre_extra_info && error)
 139                die("%s", error);
 140}
 141
 142static int pcrematch(struct grep_pat *p, const char *line, const char *eol,
 143                regmatch_t *match, int eflags)
 144{
 145        int ovector[30], ret, flags = 0;
 146
 147        if (eflags & REG_NOTBOL)
 148                flags |= PCRE_NOTBOL;
 149
 150        ret = pcre_exec(p->pcre_regexp, p->pcre_extra_info, line, eol - line,
 151                        0, flags, ovector, ARRAY_SIZE(ovector));
 152        if (ret < 0 && ret != PCRE_ERROR_NOMATCH)
 153                die("pcre_exec failed with error code %d", ret);
 154        if (ret > 0) {
 155                ret = 0;
 156                match->rm_so = ovector[0];
 157                match->rm_eo = ovector[1];
 158        }
 159
 160        return ret;
 161}
 162
 163static void free_pcre_regexp(struct grep_pat *p)
 164{
 165        pcre_free(p->pcre_regexp);
 166        pcre_free(p->pcre_extra_info);
 167}
 168#else /* !USE_LIBPCRE */
 169static void compile_pcre_regexp(struct grep_pat *p, const struct grep_opt *opt)
 170{
 171        die("cannot use Perl-compatible regexes when not compiled with USE_LIBPCRE");
 172}
 173
 174static int pcrematch(struct grep_pat *p, const char *line, const char *eol,
 175                regmatch_t *match, int eflags)
 176{
 177        return 1;
 178}
 179
 180static void free_pcre_regexp(struct grep_pat *p)
 181{
 182}
 183#endif /* !USE_LIBPCRE */
 184
 185static int is_fixed(const char *s, size_t len)
 186{
 187        size_t i;
 188
 189        /* regcomp cannot accept patterns with NULs so we
 190         * consider any pattern containing a NUL fixed.
 191         */
 192        if (memchr(s, 0, len))
 193                return 1;
 194
 195        for (i = 0; i < len; i++) {
 196                if (is_regex_special(s[i]))
 197                        return 0;
 198        }
 199
 200        return 1;
 201}
 202
 203static void compile_regexp(struct grep_pat *p, struct grep_opt *opt)
 204{
 205        int err;
 206
 207        p->word_regexp = opt->word_regexp;
 208        p->ignore_case = opt->ignore_case;
 209
 210        if (opt->fixed || is_fixed(p->pattern, p->patternlen))
 211                p->fixed = 1;
 212        else
 213                p->fixed = 0;
 214
 215        if (p->fixed) {
 216                if (opt->regflags & REG_ICASE || p->ignore_case)
 217                        p->kws = kwsalloc(tolower_trans_tbl);
 218                else
 219                        p->kws = kwsalloc(NULL);
 220                kwsincr(p->kws, p->pattern, p->patternlen);
 221                kwsprep(p->kws);
 222                return;
 223        }
 224
 225        if (opt->pcre) {
 226                compile_pcre_regexp(p, opt);
 227                return;
 228        }
 229
 230        err = regcomp(&p->regexp, p->pattern, opt->regflags);
 231        if (err) {
 232                char errbuf[1024];
 233                regerror(err, &p->regexp, errbuf, 1024);
 234                regfree(&p->regexp);
 235                compile_regexp_failed(p, errbuf);
 236        }
 237}
 238
 239static struct grep_expr *compile_pattern_or(struct grep_pat **);
 240static struct grep_expr *compile_pattern_atom(struct grep_pat **list)
 241{
 242        struct grep_pat *p;
 243        struct grep_expr *x;
 244
 245        p = *list;
 246        if (!p)
 247                return NULL;
 248        switch (p->token) {
 249        case GREP_PATTERN: /* atom */
 250        case GREP_PATTERN_HEAD:
 251        case GREP_PATTERN_BODY:
 252                x = xcalloc(1, sizeof (struct grep_expr));
 253                x->node = GREP_NODE_ATOM;
 254                x->u.atom = p;
 255                *list = p->next;
 256                return x;
 257        case GREP_OPEN_PAREN:
 258                *list = p->next;
 259                x = compile_pattern_or(list);
 260                if (!*list || (*list)->token != GREP_CLOSE_PAREN)
 261                        die("unmatched parenthesis");
 262                *list = (*list)->next;
 263                return x;
 264        default:
 265                return NULL;
 266        }
 267}
 268
 269static struct grep_expr *compile_pattern_not(struct grep_pat **list)
 270{
 271        struct grep_pat *p;
 272        struct grep_expr *x;
 273
 274        p = *list;
 275        if (!p)
 276                return NULL;
 277        switch (p->token) {
 278        case GREP_NOT:
 279                if (!p->next)
 280                        die("--not not followed by pattern expression");
 281                *list = p->next;
 282                x = xcalloc(1, sizeof (struct grep_expr));
 283                x->node = GREP_NODE_NOT;
 284                x->u.unary = compile_pattern_not(list);
 285                if (!x->u.unary)
 286                        die("--not followed by non pattern expression");
 287                return x;
 288        default:
 289                return compile_pattern_atom(list);
 290        }
 291}
 292
 293static struct grep_expr *compile_pattern_and(struct grep_pat **list)
 294{
 295        struct grep_pat *p;
 296        struct grep_expr *x, *y, *z;
 297
 298        x = compile_pattern_not(list);
 299        p = *list;
 300        if (p && p->token == GREP_AND) {
 301                if (!p->next)
 302                        die("--and not followed by pattern expression");
 303                *list = p->next;
 304                y = compile_pattern_and(list);
 305                if (!y)
 306                        die("--and not followed by pattern expression");
 307                z = xcalloc(1, sizeof (struct grep_expr));
 308                z->node = GREP_NODE_AND;
 309                z->u.binary.left = x;
 310                z->u.binary.right = y;
 311                return z;
 312        }
 313        return x;
 314}
 315
 316static struct grep_expr *compile_pattern_or(struct grep_pat **list)
 317{
 318        struct grep_pat *p;
 319        struct grep_expr *x, *y, *z;
 320
 321        x = compile_pattern_and(list);
 322        p = *list;
 323        if (x && p && p->token != GREP_CLOSE_PAREN) {
 324                y = compile_pattern_or(list);
 325                if (!y)
 326                        die("not a pattern expression %s", p->pattern);
 327                z = xcalloc(1, sizeof (struct grep_expr));
 328                z->node = GREP_NODE_OR;
 329                z->u.binary.left = x;
 330                z->u.binary.right = y;
 331                return z;
 332        }
 333        return x;
 334}
 335
 336static struct grep_expr *compile_pattern_expr(struct grep_pat **list)
 337{
 338        return compile_pattern_or(list);
 339}
 340
 341static void indent(int in)
 342{
 343        while (in-- > 0)
 344                fputc(' ', stderr);
 345}
 346
 347static void dump_grep_pat(struct grep_pat *p)
 348{
 349        switch (p->token) {
 350        case GREP_AND: fprintf(stderr, "*and*"); break;
 351        case GREP_OPEN_PAREN: fprintf(stderr, "*(*"); break;
 352        case GREP_CLOSE_PAREN: fprintf(stderr, "*)*"); break;
 353        case GREP_NOT: fprintf(stderr, "*not*"); break;
 354        case GREP_OR: fprintf(stderr, "*or*"); break;
 355
 356        case GREP_PATTERN: fprintf(stderr, "pattern"); break;
 357        case GREP_PATTERN_HEAD: fprintf(stderr, "pattern_head"); break;
 358        case GREP_PATTERN_BODY: fprintf(stderr, "pattern_body"); break;
 359        }
 360
 361        switch (p->token) {
 362        default: break;
 363        case GREP_PATTERN_HEAD:
 364                fprintf(stderr, "<head %d>", p->field); break;
 365        case GREP_PATTERN_BODY:
 366                fprintf(stderr, "<body>"); break;
 367        }
 368        switch (p->token) {
 369        default: break;
 370        case GREP_PATTERN_HEAD:
 371        case GREP_PATTERN_BODY:
 372        case GREP_PATTERN:
 373                fprintf(stderr, "%.*s", (int)p->patternlen, p->pattern);
 374                break;
 375        }
 376        fputc('\n', stderr);
 377}
 378
 379static void dump_grep_expression_1(struct grep_expr *x, int in)
 380{
 381        indent(in);
 382        switch (x->node) {
 383        case GREP_NODE_TRUE:
 384                fprintf(stderr, "true\n");
 385                break;
 386        case GREP_NODE_ATOM:
 387                dump_grep_pat(x->u.atom);
 388                break;
 389        case GREP_NODE_NOT:
 390                fprintf(stderr, "(not\n");
 391                dump_grep_expression_1(x->u.unary, in+1);
 392                indent(in);
 393                fprintf(stderr, ")\n");
 394                break;
 395        case GREP_NODE_AND:
 396                fprintf(stderr, "(and\n");
 397                dump_grep_expression_1(x->u.binary.left, in+1);
 398                dump_grep_expression_1(x->u.binary.right, in+1);
 399                indent(in);
 400                fprintf(stderr, ")\n");
 401                break;
 402        case GREP_NODE_OR:
 403                fprintf(stderr, "(or\n");
 404                dump_grep_expression_1(x->u.binary.left, in+1);
 405                dump_grep_expression_1(x->u.binary.right, in+1);
 406                indent(in);
 407                fprintf(stderr, ")\n");
 408                break;
 409        }
 410}
 411
 412static void dump_grep_expression(struct grep_opt *opt)
 413{
 414        struct grep_expr *x = opt->pattern_expression;
 415
 416        if (opt->all_match)
 417                fprintf(stderr, "[all-match]\n");
 418        dump_grep_expression_1(x, 0);
 419        fflush(NULL);
 420}
 421
 422static struct grep_expr *grep_true_expr(void)
 423{
 424        struct grep_expr *z = xcalloc(1, sizeof(*z));
 425        z->node = GREP_NODE_TRUE;
 426        return z;
 427}
 428
 429static struct grep_expr *grep_or_expr(struct grep_expr *left, struct grep_expr *right)
 430{
 431        struct grep_expr *z = xcalloc(1, sizeof(*z));
 432        z->node = GREP_NODE_OR;
 433        z->u.binary.left = left;
 434        z->u.binary.right = right;
 435        return z;
 436}
 437
 438static struct grep_expr *prep_header_patterns(struct grep_opt *opt)
 439{
 440        struct grep_pat *p;
 441        struct grep_expr *header_expr;
 442        struct grep_expr *(header_group[GREP_HEADER_FIELD_MAX]);
 443        enum grep_header_field fld;
 444
 445        if (!opt->header_list)
 446                return NULL;
 447
 448        for (p = opt->header_list; p; p = p->next) {
 449                if (p->token != GREP_PATTERN_HEAD)
 450                        die("bug: a non-header pattern in grep header list.");
 451                if (p->field < 0 || GREP_HEADER_FIELD_MAX <= p->field)
 452                        die("bug: unknown header field %d", p->field);
 453                compile_regexp(p, opt);
 454        }
 455
 456        for (fld = 0; fld < GREP_HEADER_FIELD_MAX; fld++)
 457                header_group[fld] = NULL;
 458
 459        for (p = opt->header_list; p; p = p->next) {
 460                struct grep_expr *h;
 461                struct grep_pat *pp = p;
 462
 463                h = compile_pattern_atom(&pp);
 464                if (!h || pp != p->next)
 465                        die("bug: malformed header expr");
 466                if (!header_group[p->field]) {
 467                        header_group[p->field] = h;
 468                        continue;
 469                }
 470                header_group[p->field] = grep_or_expr(h, header_group[p->field]);
 471        }
 472
 473        header_expr = NULL;
 474
 475        for (fld = 0; fld < GREP_HEADER_FIELD_MAX; fld++) {
 476                if (!header_group[fld])
 477                        continue;
 478                if (!header_expr)
 479                        header_expr = grep_true_expr();
 480                header_expr = grep_or_expr(header_group[fld], header_expr);
 481        }
 482        return header_expr;
 483}
 484
 485static struct grep_expr *grep_splice_or(struct grep_expr *x, struct grep_expr *y)
 486{
 487        struct grep_expr *z = x;
 488
 489        while (x) {
 490                assert(x->node == GREP_NODE_OR);
 491                if (x->u.binary.right &&
 492                    x->u.binary.right->node == GREP_NODE_TRUE) {
 493                        x->u.binary.right = y;
 494                        break;
 495                }
 496                x = x->u.binary.right;
 497        }
 498        return z;
 499}
 500
 501static void compile_grep_patterns_real(struct grep_opt *opt)
 502{
 503        struct grep_pat *p;
 504        struct grep_expr *header_expr = prep_header_patterns(opt);
 505
 506        for (p = opt->pattern_list; p; p = p->next) {
 507                switch (p->token) {
 508                case GREP_PATTERN: /* atom */
 509                case GREP_PATTERN_HEAD:
 510                case GREP_PATTERN_BODY:
 511                        compile_regexp(p, opt);
 512                        break;
 513                default:
 514                        opt->extended = 1;
 515                        break;
 516                }
 517        }
 518
 519        if (opt->all_match || header_expr)
 520                opt->extended = 1;
 521        else if (!opt->extended && !opt->debug)
 522                return;
 523
 524        p = opt->pattern_list;
 525        if (p)
 526                opt->pattern_expression = compile_pattern_expr(&p);
 527        if (p)
 528                die("incomplete pattern expression: %s", p->pattern);
 529
 530        if (!header_expr)
 531                return;
 532
 533        if (!opt->pattern_expression)
 534                opt->pattern_expression = header_expr;
 535        else if (opt->all_match)
 536                opt->pattern_expression = grep_splice_or(header_expr,
 537                                                         opt->pattern_expression);
 538        else
 539                opt->pattern_expression = grep_or_expr(opt->pattern_expression,
 540                                                       header_expr);
 541        opt->all_match = 1;
 542}
 543
 544void compile_grep_patterns(struct grep_opt *opt)
 545{
 546        compile_grep_patterns_real(opt);
 547        if (opt->debug)
 548                dump_grep_expression(opt);
 549}
 550
 551static void free_pattern_expr(struct grep_expr *x)
 552{
 553        switch (x->node) {
 554        case GREP_NODE_TRUE:
 555        case GREP_NODE_ATOM:
 556                break;
 557        case GREP_NODE_NOT:
 558                free_pattern_expr(x->u.unary);
 559                break;
 560        case GREP_NODE_AND:
 561        case GREP_NODE_OR:
 562                free_pattern_expr(x->u.binary.left);
 563                free_pattern_expr(x->u.binary.right);
 564                break;
 565        }
 566        free(x);
 567}
 568
 569void free_grep_patterns(struct grep_opt *opt)
 570{
 571        struct grep_pat *p, *n;
 572
 573        for (p = opt->pattern_list; p; p = n) {
 574                n = p->next;
 575                switch (p->token) {
 576                case GREP_PATTERN: /* atom */
 577                case GREP_PATTERN_HEAD:
 578                case GREP_PATTERN_BODY:
 579                        if (p->kws)
 580                                kwsfree(p->kws);
 581                        else if (p->pcre_regexp)
 582                                free_pcre_regexp(p);
 583                        else
 584                                regfree(&p->regexp);
 585                        free(p->pattern);
 586                        break;
 587                default:
 588                        break;
 589                }
 590                free(p);
 591        }
 592
 593        if (!opt->extended)
 594                return;
 595        free_pattern_expr(opt->pattern_expression);
 596}
 597
 598static char *end_of_line(char *cp, unsigned long *left)
 599{
 600        unsigned long l = *left;
 601        while (l && *cp != '\n') {
 602                l--;
 603                cp++;
 604        }
 605        *left = l;
 606        return cp;
 607}
 608
 609static int word_char(char ch)
 610{
 611        return isalnum(ch) || ch == '_';
 612}
 613
 614static void output_color(struct grep_opt *opt, const void *data, size_t size,
 615                         const char *color)
 616{
 617        if (want_color(opt->color) && color && color[0]) {
 618                opt->output(opt, color, strlen(color));
 619                opt->output(opt, data, size);
 620                opt->output(opt, GIT_COLOR_RESET, strlen(GIT_COLOR_RESET));
 621        } else
 622                opt->output(opt, data, size);
 623}
 624
 625static void output_sep(struct grep_opt *opt, char sign)
 626{
 627        if (opt->null_following_name)
 628                opt->output(opt, "\0", 1);
 629        else
 630                output_color(opt, &sign, 1, opt->color_sep);
 631}
 632
 633static void show_name(struct grep_opt *opt, const char *name)
 634{
 635        output_color(opt, name, strlen(name), opt->color_filename);
 636        opt->output(opt, opt->null_following_name ? "\0" : "\n", 1);
 637}
 638
 639static int fixmatch(struct grep_pat *p, char *line, char *eol,
 640                    regmatch_t *match)
 641{
 642        struct kwsmatch kwsm;
 643        size_t offset = kwsexec(p->kws, line, eol - line, &kwsm);
 644        if (offset == -1) {
 645                match->rm_so = match->rm_eo = -1;
 646                return REG_NOMATCH;
 647        } else {
 648                match->rm_so = offset;
 649                match->rm_eo = match->rm_so + kwsm.size[0];
 650                return 0;
 651        }
 652}
 653
 654static int regmatch(const regex_t *preg, char *line, char *eol,
 655                    regmatch_t *match, int eflags)
 656{
 657#ifdef REG_STARTEND
 658        match->rm_so = 0;
 659        match->rm_eo = eol - line;
 660        eflags |= REG_STARTEND;
 661#endif
 662        return regexec(preg, line, 1, match, eflags);
 663}
 664
 665static int patmatch(struct grep_pat *p, char *line, char *eol,
 666                    regmatch_t *match, int eflags)
 667{
 668        int hit;
 669
 670        if (p->fixed)
 671                hit = !fixmatch(p, line, eol, match);
 672        else if (p->pcre_regexp)
 673                hit = !pcrematch(p, line, eol, match, eflags);
 674        else
 675                hit = !regmatch(&p->regexp, line, eol, match, eflags);
 676
 677        return hit;
 678}
 679
 680static int strip_timestamp(char *bol, char **eol_p)
 681{
 682        char *eol = *eol_p;
 683        int ch;
 684
 685        while (bol < --eol) {
 686                if (*eol != '>')
 687                        continue;
 688                *eol_p = ++eol;
 689                ch = *eol;
 690                *eol = '\0';
 691                return ch;
 692        }
 693        return 0;
 694}
 695
 696static struct {
 697        const char *field;
 698        size_t len;
 699} header_field[] = {
 700        { "author ", 7 },
 701        { "committer ", 10 },
 702        { "reflog ", 7 },
 703};
 704
 705static int match_one_pattern(struct grep_pat *p, char *bol, char *eol,
 706                             enum grep_context ctx,
 707                             regmatch_t *pmatch, int eflags)
 708{
 709        int hit = 0;
 710        int saved_ch = 0;
 711        const char *start = bol;
 712
 713        if ((p->token != GREP_PATTERN) &&
 714            ((p->token == GREP_PATTERN_HEAD) != (ctx == GREP_CONTEXT_HEAD)))
 715                return 0;
 716
 717        if (p->token == GREP_PATTERN_HEAD) {
 718                const char *field;
 719                size_t len;
 720                assert(p->field < ARRAY_SIZE(header_field));
 721                field = header_field[p->field].field;
 722                len = header_field[p->field].len;
 723                if (strncmp(bol, field, len))
 724                        return 0;
 725                bol += len;
 726                switch (p->field) {
 727                case GREP_HEADER_AUTHOR:
 728                case GREP_HEADER_COMMITTER:
 729                        saved_ch = strip_timestamp(bol, &eol);
 730                        break;
 731                default:
 732                        break;
 733                }
 734        }
 735
 736 again:
 737        hit = patmatch(p, bol, eol, pmatch, eflags);
 738
 739        if (hit && p->word_regexp) {
 740                if ((pmatch[0].rm_so < 0) ||
 741                    (eol - bol) < pmatch[0].rm_so ||
 742                    (pmatch[0].rm_eo < 0) ||
 743                    (eol - bol) < pmatch[0].rm_eo)
 744                        die("regexp returned nonsense");
 745
 746                /* Match beginning must be either beginning of the
 747                 * line, or at word boundary (i.e. the last char must
 748                 * not be a word char).  Similarly, match end must be
 749                 * either end of the line, or at word boundary
 750                 * (i.e. the next char must not be a word char).
 751                 */
 752                if ( ((pmatch[0].rm_so == 0) ||
 753                      !word_char(bol[pmatch[0].rm_so-1])) &&
 754                     ((pmatch[0].rm_eo == (eol-bol)) ||
 755                      !word_char(bol[pmatch[0].rm_eo])) )
 756                        ;
 757                else
 758                        hit = 0;
 759
 760                /* Words consist of at least one character. */
 761                if (pmatch->rm_so == pmatch->rm_eo)
 762                        hit = 0;
 763
 764                if (!hit && pmatch[0].rm_so + bol + 1 < eol) {
 765                        /* There could be more than one match on the
 766                         * line, and the first match might not be
 767                         * strict word match.  But later ones could be!
 768                         * Forward to the next possible start, i.e. the
 769                         * next position following a non-word char.
 770                         */
 771                        bol = pmatch[0].rm_so + bol + 1;
 772                        while (word_char(bol[-1]) && bol < eol)
 773                                bol++;
 774                        eflags |= REG_NOTBOL;
 775                        if (bol < eol)
 776                                goto again;
 777                }
 778        }
 779        if (p->token == GREP_PATTERN_HEAD && saved_ch)
 780                *eol = saved_ch;
 781        if (hit) {
 782                pmatch[0].rm_so += bol - start;
 783                pmatch[0].rm_eo += bol - start;
 784        }
 785        return hit;
 786}
 787
 788static int match_expr_eval(struct grep_expr *x, char *bol, char *eol,
 789                           enum grep_context ctx, int collect_hits)
 790{
 791        int h = 0;
 792        regmatch_t match;
 793
 794        if (!x)
 795                die("Not a valid grep expression");
 796        switch (x->node) {
 797        case GREP_NODE_TRUE:
 798                h = 1;
 799                break;
 800        case GREP_NODE_ATOM:
 801                h = match_one_pattern(x->u.atom, bol, eol, ctx, &match, 0);
 802                break;
 803        case GREP_NODE_NOT:
 804                h = !match_expr_eval(x->u.unary, bol, eol, ctx, 0);
 805                break;
 806        case GREP_NODE_AND:
 807                if (!match_expr_eval(x->u.binary.left, bol, eol, ctx, 0))
 808                        return 0;
 809                h = match_expr_eval(x->u.binary.right, bol, eol, ctx, 0);
 810                break;
 811        case GREP_NODE_OR:
 812                if (!collect_hits)
 813                        return (match_expr_eval(x->u.binary.left,
 814                                                bol, eol, ctx, 0) ||
 815                                match_expr_eval(x->u.binary.right,
 816                                                bol, eol, ctx, 0));
 817                h = match_expr_eval(x->u.binary.left, bol, eol, ctx, 0);
 818                x->u.binary.left->hit |= h;
 819                h |= match_expr_eval(x->u.binary.right, bol, eol, ctx, 1);
 820                break;
 821        default:
 822                die("Unexpected node type (internal error) %d", x->node);
 823        }
 824        if (collect_hits)
 825                x->hit |= h;
 826        return h;
 827}
 828
 829static int match_expr(struct grep_opt *opt, char *bol, char *eol,
 830                      enum grep_context ctx, int collect_hits)
 831{
 832        struct grep_expr *x = opt->pattern_expression;
 833        return match_expr_eval(x, bol, eol, ctx, collect_hits);
 834}
 835
 836static int match_line(struct grep_opt *opt, char *bol, char *eol,
 837                      enum grep_context ctx, int collect_hits)
 838{
 839        struct grep_pat *p;
 840        regmatch_t match;
 841
 842        if (opt->extended)
 843                return match_expr(opt, bol, eol, ctx, collect_hits);
 844
 845        /* we do not call with collect_hits without being extended */
 846        for (p = opt->pattern_list; p; p = p->next) {
 847                if (match_one_pattern(p, bol, eol, ctx, &match, 0))
 848                        return 1;
 849        }
 850        return 0;
 851}
 852
 853static int match_next_pattern(struct grep_pat *p, char *bol, char *eol,
 854                              enum grep_context ctx,
 855                              regmatch_t *pmatch, int eflags)
 856{
 857        regmatch_t match;
 858
 859        if (!match_one_pattern(p, bol, eol, ctx, &match, eflags))
 860                return 0;
 861        if (match.rm_so < 0 || match.rm_eo < 0)
 862                return 0;
 863        if (pmatch->rm_so >= 0 && pmatch->rm_eo >= 0) {
 864                if (match.rm_so > pmatch->rm_so)
 865                        return 1;
 866                if (match.rm_so == pmatch->rm_so && match.rm_eo < pmatch->rm_eo)
 867                        return 1;
 868        }
 869        pmatch->rm_so = match.rm_so;
 870        pmatch->rm_eo = match.rm_eo;
 871        return 1;
 872}
 873
 874static int next_match(struct grep_opt *opt, char *bol, char *eol,
 875                      enum grep_context ctx, regmatch_t *pmatch, int eflags)
 876{
 877        struct grep_pat *p;
 878        int hit = 0;
 879
 880        pmatch->rm_so = pmatch->rm_eo = -1;
 881        if (bol < eol) {
 882                for (p = opt->pattern_list; p; p = p->next) {
 883                        switch (p->token) {
 884                        case GREP_PATTERN: /* atom */
 885                        case GREP_PATTERN_HEAD:
 886                        case GREP_PATTERN_BODY:
 887                                hit |= match_next_pattern(p, bol, eol, ctx,
 888                                                          pmatch, eflags);
 889                                break;
 890                        default:
 891                                break;
 892                        }
 893                }
 894        }
 895        return hit;
 896}
 897
 898static void show_line(struct grep_opt *opt, char *bol, char *eol,
 899                      const char *name, unsigned lno, char sign)
 900{
 901        int rest = eol - bol;
 902        char *line_color = NULL;
 903
 904        if (opt->file_break && opt->last_shown == 0) {
 905                if (opt->show_hunk_mark)
 906                        opt->output(opt, "\n", 1);
 907        } else if (opt->pre_context || opt->post_context || opt->funcbody) {
 908                if (opt->last_shown == 0) {
 909                        if (opt->show_hunk_mark) {
 910                                output_color(opt, "--", 2, opt->color_sep);
 911                                opt->output(opt, "\n", 1);
 912                        }
 913                } else if (lno > opt->last_shown + 1) {
 914                        output_color(opt, "--", 2, opt->color_sep);
 915                        opt->output(opt, "\n", 1);
 916                }
 917        }
 918        if (opt->heading && opt->last_shown == 0) {
 919                output_color(opt, name, strlen(name), opt->color_filename);
 920                opt->output(opt, "\n", 1);
 921        }
 922        opt->last_shown = lno;
 923
 924        if (!opt->heading && opt->pathname) {
 925                output_color(opt, name, strlen(name), opt->color_filename);
 926                output_sep(opt, sign);
 927        }
 928        if (opt->linenum) {
 929                char buf[32];
 930                snprintf(buf, sizeof(buf), "%d", lno);
 931                output_color(opt, buf, strlen(buf), opt->color_lineno);
 932                output_sep(opt, sign);
 933        }
 934        if (opt->color) {
 935                regmatch_t match;
 936                enum grep_context ctx = GREP_CONTEXT_BODY;
 937                int ch = *eol;
 938                int eflags = 0;
 939
 940                if (sign == ':')
 941                        line_color = opt->color_selected;
 942                else if (sign == '-')
 943                        line_color = opt->color_context;
 944                else if (sign == '=')
 945                        line_color = opt->color_function;
 946                *eol = '\0';
 947                while (next_match(opt, bol, eol, ctx, &match, eflags)) {
 948                        if (match.rm_so == match.rm_eo)
 949                                break;
 950
 951                        output_color(opt, bol, match.rm_so, line_color);
 952                        output_color(opt, bol + match.rm_so,
 953                                     match.rm_eo - match.rm_so,
 954                                     opt->color_match);
 955                        bol += match.rm_eo;
 956                        rest -= match.rm_eo;
 957                        eflags = REG_NOTBOL;
 958                }
 959                *eol = ch;
 960        }
 961        output_color(opt, bol, rest, line_color);
 962        opt->output(opt, "\n", 1);
 963}
 964
 965#ifndef NO_PTHREADS
 966int grep_use_locks;
 967
 968/*
 969 * This lock protects access to the gitattributes machinery, which is
 970 * not thread-safe.
 971 */
 972pthread_mutex_t grep_attr_mutex;
 973
 974static inline void grep_attr_lock(void)
 975{
 976        if (grep_use_locks)
 977                pthread_mutex_lock(&grep_attr_mutex);
 978}
 979
 980static inline void grep_attr_unlock(void)
 981{
 982        if (grep_use_locks)
 983                pthread_mutex_unlock(&grep_attr_mutex);
 984}
 985
 986/*
 987 * Same as git_attr_mutex, but protecting the thread-unsafe object db access.
 988 */
 989pthread_mutex_t grep_read_mutex;
 990
 991#else
 992#define grep_attr_lock()
 993#define grep_attr_unlock()
 994#endif
 995
 996static int match_funcname(struct grep_opt *opt, struct grep_source *gs, char *bol, char *eol)
 997{
 998        xdemitconf_t *xecfg = opt->priv;
 999        if (xecfg && !xecfg->find_func) {
1000                grep_source_load_driver(gs);
1001                if (gs->driver->funcname.pattern) {
1002                        const struct userdiff_funcname *pe = &gs->driver->funcname;
1003                        xdiff_set_find_func(xecfg, pe->pattern, pe->cflags);
1004                } else {
1005                        xecfg = opt->priv = NULL;
1006                }
1007        }
1008
1009        if (xecfg) {
1010                char buf[1];
1011                return xecfg->find_func(bol, eol - bol, buf, 1,
1012                                        xecfg->find_func_priv) >= 0;
1013        }
1014
1015        if (bol == eol)
1016                return 0;
1017        if (isalpha(*bol) || *bol == '_' || *bol == '$')
1018                return 1;
1019        return 0;
1020}
1021
1022static void show_funcname_line(struct grep_opt *opt, struct grep_source *gs,
1023                               char *bol, unsigned lno)
1024{
1025        while (bol > gs->buf) {
1026                char *eol = --bol;
1027
1028                while (bol > gs->buf && bol[-1] != '\n')
1029                        bol--;
1030                lno--;
1031
1032                if (lno <= opt->last_shown)
1033                        break;
1034
1035                if (match_funcname(opt, gs, bol, eol)) {
1036                        show_line(opt, bol, eol, gs->name, lno, '=');
1037                        break;
1038                }
1039        }
1040}
1041
1042static void show_pre_context(struct grep_opt *opt, struct grep_source *gs,
1043                             char *bol, char *end, unsigned lno)
1044{
1045        unsigned cur = lno, from = 1, funcname_lno = 0;
1046        int funcname_needed = !!opt->funcname;
1047
1048        if (opt->funcbody && !match_funcname(opt, gs, bol, end))
1049                funcname_needed = 2;
1050
1051        if (opt->pre_context < lno)
1052                from = lno - opt->pre_context;
1053        if (from <= opt->last_shown)
1054                from = opt->last_shown + 1;
1055
1056        /* Rewind. */
1057        while (bol > gs->buf &&
1058               cur > (funcname_needed == 2 ? opt->last_shown + 1 : from)) {
1059                char *eol = --bol;
1060
1061                while (bol > gs->buf && bol[-1] != '\n')
1062                        bol--;
1063                cur--;
1064                if (funcname_needed && match_funcname(opt, gs, bol, eol)) {
1065                        funcname_lno = cur;
1066                        funcname_needed = 0;
1067                }
1068        }
1069
1070        /* We need to look even further back to find a function signature. */
1071        if (opt->funcname && funcname_needed)
1072                show_funcname_line(opt, gs, bol, cur);
1073
1074        /* Back forward. */
1075        while (cur < lno) {
1076                char *eol = bol, sign = (cur == funcname_lno) ? '=' : '-';
1077
1078                while (*eol != '\n')
1079                        eol++;
1080                show_line(opt, bol, eol, gs->name, cur, sign);
1081                bol = eol + 1;
1082                cur++;
1083        }
1084}
1085
1086static int should_lookahead(struct grep_opt *opt)
1087{
1088        struct grep_pat *p;
1089
1090        if (opt->extended)
1091                return 0; /* punt for too complex stuff */
1092        if (opt->invert)
1093                return 0;
1094        for (p = opt->pattern_list; p; p = p->next) {
1095                if (p->token != GREP_PATTERN)
1096                        return 0; /* punt for "header only" and stuff */
1097        }
1098        return 1;
1099}
1100
1101static int look_ahead(struct grep_opt *opt,
1102                      unsigned long *left_p,
1103                      unsigned *lno_p,
1104                      char **bol_p)
1105{
1106        unsigned lno = *lno_p;
1107        char *bol = *bol_p;
1108        struct grep_pat *p;
1109        char *sp, *last_bol;
1110        regoff_t earliest = -1;
1111
1112        for (p = opt->pattern_list; p; p = p->next) {
1113                int hit;
1114                regmatch_t m;
1115
1116                hit = patmatch(p, bol, bol + *left_p, &m, 0);
1117                if (!hit || m.rm_so < 0 || m.rm_eo < 0)
1118                        continue;
1119                if (earliest < 0 || m.rm_so < earliest)
1120                        earliest = m.rm_so;
1121        }
1122
1123        if (earliest < 0) {
1124                *bol_p = bol + *left_p;
1125                *left_p = 0;
1126                return 1;
1127        }
1128        for (sp = bol + earliest; bol < sp && sp[-1] != '\n'; sp--)
1129                ; /* find the beginning of the line */
1130        last_bol = sp;
1131
1132        for (sp = bol; sp < last_bol; sp++) {
1133                if (*sp == '\n')
1134                        lno++;
1135        }
1136        *left_p -= last_bol - bol;
1137        *bol_p = last_bol;
1138        *lno_p = lno;
1139        return 0;
1140}
1141
1142static void std_output(struct grep_opt *opt, const void *buf, size_t size)
1143{
1144        fwrite(buf, size, 1, stdout);
1145}
1146
1147static int grep_source_1(struct grep_opt *opt, struct grep_source *gs, int collect_hits)
1148{
1149        char *bol;
1150        unsigned long left;
1151        unsigned lno = 1;
1152        unsigned last_hit = 0;
1153        int binary_match_only = 0;
1154        unsigned count = 0;
1155        int try_lookahead = 0;
1156        int show_function = 0;
1157        enum grep_context ctx = GREP_CONTEXT_HEAD;
1158        xdemitconf_t xecfg;
1159
1160        if (!opt->output)
1161                opt->output = std_output;
1162
1163        if (opt->pre_context || opt->post_context || opt->file_break ||
1164            opt->funcbody) {
1165                /* Show hunk marks, except for the first file. */
1166                if (opt->last_shown)
1167                        opt->show_hunk_mark = 1;
1168                /*
1169                 * If we're using threads then we can't easily identify
1170                 * the first file.  Always put hunk marks in that case
1171                 * and skip the very first one later in work_done().
1172                 */
1173                if (opt->output != std_output)
1174                        opt->show_hunk_mark = 1;
1175        }
1176        opt->last_shown = 0;
1177
1178        switch (opt->binary) {
1179        case GREP_BINARY_DEFAULT:
1180                if (grep_source_is_binary(gs))
1181                        binary_match_only = 1;
1182                break;
1183        case GREP_BINARY_NOMATCH:
1184                if (grep_source_is_binary(gs))
1185                        return 0; /* Assume unmatch */
1186                break;
1187        case GREP_BINARY_TEXT:
1188                break;
1189        default:
1190                die("bug: unknown binary handling mode");
1191        }
1192
1193        memset(&xecfg, 0, sizeof(xecfg));
1194        opt->priv = &xecfg;
1195
1196        try_lookahead = should_lookahead(opt);
1197
1198        if (grep_source_load(gs) < 0)
1199                return 0;
1200
1201        bol = gs->buf;
1202        left = gs->size;
1203        while (left) {
1204                char *eol, ch;
1205                int hit;
1206
1207                /*
1208                 * look_ahead() skips quickly to the line that possibly
1209                 * has the next hit; don't call it if we need to do
1210                 * something more than just skipping the current line
1211                 * in response to an unmatch for the current line.  E.g.
1212                 * inside a post-context window, we will show the current
1213                 * line as a context around the previous hit when it
1214                 * doesn't hit.
1215                 */
1216                if (try_lookahead
1217                    && !(last_hit
1218                         && (show_function ||
1219                             lno <= last_hit + opt->post_context))
1220                    && look_ahead(opt, &left, &lno, &bol))
1221                        break;
1222                eol = end_of_line(bol, &left);
1223                ch = *eol;
1224                *eol = 0;
1225
1226                if ((ctx == GREP_CONTEXT_HEAD) && (eol == bol))
1227                        ctx = GREP_CONTEXT_BODY;
1228
1229                hit = match_line(opt, bol, eol, ctx, collect_hits);
1230                *eol = ch;
1231
1232                if (collect_hits)
1233                        goto next_line;
1234
1235                /* "grep -v -e foo -e bla" should list lines
1236                 * that do not have either, so inversion should
1237                 * be done outside.
1238                 */
1239                if (opt->invert)
1240                        hit = !hit;
1241                if (opt->unmatch_name_only) {
1242                        if (hit)
1243                                return 0;
1244                        goto next_line;
1245                }
1246                if (hit) {
1247                        count++;
1248                        if (opt->status_only)
1249                                return 1;
1250                        if (opt->name_only) {
1251                                show_name(opt, gs->name);
1252                                return 1;
1253                        }
1254                        if (opt->count)
1255                                goto next_line;
1256                        if (binary_match_only) {
1257                                opt->output(opt, "Binary file ", 12);
1258                                output_color(opt, gs->name, strlen(gs->name),
1259                                             opt->color_filename);
1260                                opt->output(opt, " matches\n", 9);
1261                                return 1;
1262                        }
1263                        /* Hit at this line.  If we haven't shown the
1264                         * pre-context lines, we would need to show them.
1265                         */
1266                        if (opt->pre_context || opt->funcbody)
1267                                show_pre_context(opt, gs, bol, eol, lno);
1268                        else if (opt->funcname)
1269                                show_funcname_line(opt, gs, bol, lno);
1270                        show_line(opt, bol, eol, gs->name, lno, ':');
1271                        last_hit = lno;
1272                        if (opt->funcbody)
1273                                show_function = 1;
1274                        goto next_line;
1275                }
1276                if (show_function && match_funcname(opt, gs, bol, eol))
1277                        show_function = 0;
1278                if (show_function ||
1279                    (last_hit && lno <= last_hit + opt->post_context)) {
1280                        /* If the last hit is within the post context,
1281                         * we need to show this line.
1282                         */
1283                        show_line(opt, bol, eol, gs->name, lno, '-');
1284                }
1285
1286        next_line:
1287                bol = eol + 1;
1288                if (!left)
1289                        break;
1290                left--;
1291                lno++;
1292        }
1293
1294        if (collect_hits)
1295                return 0;
1296
1297        if (opt->status_only)
1298                return 0;
1299        if (opt->unmatch_name_only) {
1300                /* We did not see any hit, so we want to show this */
1301                show_name(opt, gs->name);
1302                return 1;
1303        }
1304
1305        xdiff_clear_find_func(&xecfg);
1306        opt->priv = NULL;
1307
1308        /* NEEDSWORK:
1309         * The real "grep -c foo *.c" gives many "bar.c:0" lines,
1310         * which feels mostly useless but sometimes useful.  Maybe
1311         * make it another option?  For now suppress them.
1312         */
1313        if (opt->count && count) {
1314                char buf[32];
1315                output_color(opt, gs->name, strlen(gs->name), opt->color_filename);
1316                output_sep(opt, ':');
1317                snprintf(buf, sizeof(buf), "%u\n", count);
1318                opt->output(opt, buf, strlen(buf));
1319                return 1;
1320        }
1321        return !!last_hit;
1322}
1323
1324static void clr_hit_marker(struct grep_expr *x)
1325{
1326        /* All-hit markers are meaningful only at the very top level
1327         * OR node.
1328         */
1329        while (1) {
1330                x->hit = 0;
1331                if (x->node != GREP_NODE_OR)
1332                        return;
1333                x->u.binary.left->hit = 0;
1334                x = x->u.binary.right;
1335        }
1336}
1337
1338static int chk_hit_marker(struct grep_expr *x)
1339{
1340        /* Top level nodes have hit markers.  See if they all are hits */
1341        while (1) {
1342                if (x->node != GREP_NODE_OR)
1343                        return x->hit;
1344                if (!x->u.binary.left->hit)
1345                        return 0;
1346                x = x->u.binary.right;
1347        }
1348}
1349
1350int grep_source(struct grep_opt *opt, struct grep_source *gs)
1351{
1352        /*
1353         * we do not have to do the two-pass grep when we do not check
1354         * buffer-wide "all-match".
1355         */
1356        if (!opt->all_match)
1357                return grep_source_1(opt, gs, 0);
1358
1359        /* Otherwise the toplevel "or" terms hit a bit differently.
1360         * We first clear hit markers from them.
1361         */
1362        clr_hit_marker(opt->pattern_expression);
1363        grep_source_1(opt, gs, 1);
1364
1365        if (!chk_hit_marker(opt->pattern_expression))
1366                return 0;
1367
1368        return grep_source_1(opt, gs, 0);
1369}
1370
1371int grep_buffer(struct grep_opt *opt, char *buf, unsigned long size)
1372{
1373        struct grep_source gs;
1374        int r;
1375
1376        grep_source_init(&gs, GREP_SOURCE_BUF, NULL, NULL);
1377        gs.buf = buf;
1378        gs.size = size;
1379
1380        r = grep_source(opt, &gs);
1381
1382        grep_source_clear(&gs);
1383        return r;
1384}
1385
1386void grep_source_init(struct grep_source *gs, enum grep_source_type type,
1387                      const char *name, const void *identifier)
1388{
1389        gs->type = type;
1390        gs->name = name ? xstrdup(name) : NULL;
1391        gs->buf = NULL;
1392        gs->size = 0;
1393        gs->driver = NULL;
1394
1395        switch (type) {
1396        case GREP_SOURCE_FILE:
1397                gs->identifier = xstrdup(identifier);
1398                break;
1399        case GREP_SOURCE_SHA1:
1400                gs->identifier = xmalloc(20);
1401                memcpy(gs->identifier, identifier, 20);
1402                break;
1403        case GREP_SOURCE_BUF:
1404                gs->identifier = NULL;
1405        }
1406}
1407
1408void grep_source_clear(struct grep_source *gs)
1409{
1410        free(gs->name);
1411        gs->name = NULL;
1412        free(gs->identifier);
1413        gs->identifier = NULL;
1414        grep_source_clear_data(gs);
1415}
1416
1417void grep_source_clear_data(struct grep_source *gs)
1418{
1419        switch (gs->type) {
1420        case GREP_SOURCE_FILE:
1421        case GREP_SOURCE_SHA1:
1422                free(gs->buf);
1423                gs->buf = NULL;
1424                gs->size = 0;
1425                break;
1426        case GREP_SOURCE_BUF:
1427                /* leave user-provided buf intact */
1428                break;
1429        }
1430}
1431
1432static int grep_source_load_sha1(struct grep_source *gs)
1433{
1434        enum object_type type;
1435
1436        grep_read_lock();
1437        gs->buf = read_sha1_file(gs->identifier, &type, &gs->size);
1438        grep_read_unlock();
1439
1440        if (!gs->buf)
1441                return error(_("'%s': unable to read %s"),
1442                             gs->name,
1443                             sha1_to_hex(gs->identifier));
1444        return 0;
1445}
1446
1447static int grep_source_load_file(struct grep_source *gs)
1448{
1449        const char *filename = gs->identifier;
1450        struct stat st;
1451        char *data;
1452        size_t size;
1453        int i;
1454
1455        if (lstat(filename, &st) < 0) {
1456        err_ret:
1457                if (errno != ENOENT)
1458                        error(_("'%s': %s"), filename, strerror(errno));
1459                return -1;
1460        }
1461        if (!S_ISREG(st.st_mode))
1462                return -1;
1463        size = xsize_t(st.st_size);
1464        i = open(filename, O_RDONLY);
1465        if (i < 0)
1466                goto err_ret;
1467        data = xmalloc(size + 1);
1468        if (st.st_size != read_in_full(i, data, size)) {
1469                error(_("'%s': short read %s"), filename, strerror(errno));
1470                close(i);
1471                free(data);
1472                return -1;
1473        }
1474        close(i);
1475        data[size] = 0;
1476
1477        gs->buf = data;
1478        gs->size = size;
1479        return 0;
1480}
1481
1482static int grep_source_load(struct grep_source *gs)
1483{
1484        if (gs->buf)
1485                return 0;
1486
1487        switch (gs->type) {
1488        case GREP_SOURCE_FILE:
1489                return grep_source_load_file(gs);
1490        case GREP_SOURCE_SHA1:
1491                return grep_source_load_sha1(gs);
1492        case GREP_SOURCE_BUF:
1493                return gs->buf ? 0 : -1;
1494        }
1495        die("BUG: invalid grep_source type");
1496}
1497
1498void grep_source_load_driver(struct grep_source *gs)
1499{
1500        if (gs->driver)
1501                return;
1502
1503        grep_attr_lock();
1504        gs->driver = userdiff_find_by_path(gs->name);
1505        if (!gs->driver)
1506                gs->driver = userdiff_find_by_name("default");
1507        grep_attr_unlock();
1508}
1509
1510static int grep_source_is_binary(struct grep_source *gs)
1511{
1512        grep_source_load_driver(gs);
1513        if (gs->driver->binary != -1)
1514                return gs->driver->binary;
1515
1516        if (!grep_source_load(gs))
1517                return buffer_is_binary(gs->buf, gs->size);
1518
1519        return 0;
1520}