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   1 /*
   2  * Builtin "git grep"
   3  *
   4  * Copyright (c) 2006 Junio C Hamano
   5  */
   6 #include "cache.h"
   7 #include "blob.h"
   8 #include "tree.h"
   9 #include "commit.h"
  10 #include "tag.h"
  11 #include "tree-walk.h"
  12 #include "builtin.h"
  13 #include "grep.h"
  14
  15 /*
  16  * git grep pathspecs are somewhat different from diff-tree pathspecs;
  17  * pathname wildcards are allowed.
  18  */
  19 static int pathspec_matches(const char **paths, const char *name)
  20 {
  21         int namelen, i;
  22         if (!paths || !*paths)
  23                 return 1;
  24         namelen = strlen(name);
  25         for (i = 0; paths[i]; i++) {
  26                 const char *match = paths[i];
  27                 int matchlen = strlen(match);
  28                 const char *cp, *meta;
  29
  30                 if (!matchlen ||
  31                     ((matchlen <= namelen) &&
  32                      !strncmp(name, match, matchlen) &&
  33                      (match[matchlen-1] == '/' ||
  34                       name[matchlen] == '\0' || name[matchlen] == '/')))
  35                         return 1;
  36                 if (!fnmatch(match, name, 0))
  37                         return 1;
  38                 if (name[namelen-1] != '/')
  39                         continue;
  40
  41                 /* We are being asked if the directory ("name") is worth
  42                  * descending into.
  43                  *
  44                  * Find the longest leading directory name that does
  45                  * not have metacharacter in the pathspec; the name
  46                  * we are looking at must overlap with that directory.
  47                  */
  48                 for (cp = match, meta = NULL; cp - match < matchlen; cp++) {
  49                         char ch = *cp;
  50                         if (ch == '*' || ch == '[' || ch == '?') {
  51                                 meta = cp;
  52                                 break;
  53                         }
  54                 }
  55                 if (!meta)
  56                         meta = cp; /* fully literal */
  57
  58                 if (namelen <= meta - match) {
  59                         /* Looking at "Documentation/" and
  60                          * the pattern says "Documentation/howto/", or
  61                          * "Documentation/diff*.txt".  The name we
  62                          * have should match prefix.
  63                          */
  64                         if (!memcmp(match, name, namelen))
  65                                 return 1;
  66                         continue;
  67                 }
  68
  69                 if (meta - match < namelen) {
  70                         /* Looking at "Documentation/howto/" and
  71                          * the pattern says "Documentation/h*";
  72                          * match up to "Do.../h"; this avoids descending
  73                          * into "Documentation/technical/".
  74                          */
  75                         if (!memcmp(match, name, meta - match))
  76                                 return 1;
  77                         continue;
  78                 }
  79         }
  80         return 0;
  81 }
  82
  83 static int grep_sha1(struct grep_opt *opt, const unsigned char *sha1, const char *name, int tree_name_len)
  84 {
  85         unsigned long size;
  86         char *data;
  87         enum object_type type;
  88         char *to_free = NULL;
  89         int hit;
  90
  91         data = read_sha1_file(sha1, &type, &size);
  92         if (!data) {
  93                 error("'%s': unable to read %s", name, sha1_to_hex(sha1));
  94                 return 0;
  95         }
  96         if (opt->relative && opt->prefix_length) {
  97                 static char name_buf[PATH_MAX];
  98                 char *cp;
  99                 int name_len = strlen(name) - opt->prefix_length + 1;
 100
 101                 if (!tree_name_len)
 102                         name += opt->prefix_length;
 103                 else {
 104                         if (ARRAY_SIZE(name_buf) <= name_len)
 105                                 cp = to_free = xmalloc(name_len);
 106                         else
 107                                 cp = name_buf;
 108                         memcpy(cp, name, tree_name_len);
 109                         strcpy(cp + tree_name_len,
 110                                name + tree_name_len + opt->prefix_length);
 111                         name = cp;
 112                 }
 113         }
 114         hit = grep_buffer(opt, name, data, size);
 115         free(data);
 116         free(to_free);
 117         return hit;
 118 }
 119
 120 static int grep_file(struct grep_opt *opt, const char *filename)
 121 {
 122         struct stat st;
 123         int i;
 124         char *data;
 125         if (lstat(filename, &st) < 0) {
 126         err_ret:
 127                 if (errno != ENOENT)
 128                         error("'%s': %s", filename, strerror(errno));
 129                 return 0;
 130         }
 131         if (!st.st_size)
 132                 return 0; /* empty file -- no grep hit */
 133         if (!S_ISREG(st.st_mode))
 134                 return 0;
 135         i = open(filename, O_RDONLY);
 136         if (i < 0)
 137                 goto err_ret;
 138         data = xmalloc(st.st_size + 1);
 139         if (st.st_size != read_in_full(i, data, st.st_size)) {
 140                 error("'%s': short read %s", filename, strerror(errno));
 141                 close(i);
 142                 free(data);
 143                 return 0;
 144         }
 145         close(i);
 146         if (opt->relative && opt->prefix_length)
 147                 filename += opt->prefix_length;
 148         i = grep_buffer(opt, filename, data, st.st_size);
 149         free(data);
 150         return i;
 151 }
 152
 153 #ifdef __unix__
 154 static int exec_grep(int argc, const char **argv)
 155 {
 156         pid_t pid;
 157         int status;
 158
 159         argv[argc] = NULL;
 160         pid = fork();
 161         if (pid < 0)
 162                 return pid;
 163         if (!pid) {
 164                 execvp("grep", (char **) argv);
 165                 exit(255);
 166         }
 167         while (waitpid(pid, &status, 0) < 0) {
 168                 if (errno == EINTR)
 169                         continue;
 170                 return -1;
 171         }
 172         if (WIFEXITED(status)) {
 173                 if (!WEXITSTATUS(status))
 174                         return 1;
 175                 return 0;
 176         }
 177         return -1;
 178 }
 179
 180 #define MAXARGS 1000
 181 #define ARGBUF 4096
 182 #define push_arg(a) do { \
 183         if (nr < MAXARGS) argv[nr++] = (a); \
 184         else die("maximum number of args exceeded"); \
 185         } while (0)
 186
 187 static int external_grep(struct grep_opt *opt, const char **paths, int cached)
 188 {
 189         int i, nr, argc, hit, len, status;
 190         const char *argv[MAXARGS+1];
 191         char randarg[ARGBUF];
 192         char *argptr = randarg;
 193         struct grep_pat *p;
 194
 195         if (opt->extended || (opt->relative && opt->prefix_length))
 196                 return -1;
 197         len = nr = 0;
 198         push_arg("grep");
 199         if (opt->fixed)
 200                 push_arg("-F");
 201         if (opt->linenum)
 202                 push_arg("-n");
 203         if (!opt->pathname)
 204                 push_arg("-h");
 205         if (opt->regflags & REG_EXTENDED)
 206                 push_arg("-E");
 207         if (opt->regflags & REG_ICASE)
 208                 push_arg("-i");
 209         if (opt->word_regexp)
 210                 push_arg("-w");
 211         if (opt->name_only)
 212                 push_arg("-l");
 213         if (opt->unmatch_name_only)
 214                 push_arg("-L");
 215         if (opt->count)
 216                 push_arg("-c");
 217         if (opt->post_context || opt->pre_context) {
 218                 if (opt->post_context != opt->pre_context) {
 219                         if (opt->pre_context) {
 220                                 push_arg("-B");
 221                                 len += snprintf(argptr, sizeof(randarg)-len,
 222                                                 "%u", opt->pre_context);
 223                                 if (sizeof(randarg) <= len)
 224                                         die("maximum length of args exceeded");
 225                                 push_arg(argptr);
 226                                 argptr += len;
 227                         }
 228                         if (opt->post_context) {
 229                                 push_arg("-A");
 230                                 len += snprintf(argptr, sizeof(randarg)-len,
 231                                                 "%u", opt->post_context);
 232                                 if (sizeof(randarg) <= len)
 233                                         die("maximum length of args exceeded");
 234                                 push_arg(argptr);
 235                                 argptr += len;
 236                         }
 237                 }
 238                 else {
 239                         push_arg("-C");
 240                         len += snprintf(argptr, sizeof(randarg)-len,
 241                                         "%u", opt->post_context);
 242                         if (sizeof(randarg) <= len)
 243                                 die("maximum length of args exceeded");
 244                         push_arg(argptr);
 245                         argptr += len;
 246                 }
 247         }
 248         for (p = opt->pattern_list; p; p = p->next) {
 249                 push_arg("-e");
 250                 push_arg(p->pattern);
 251         }
 252
 253         /*
 254          * To make sure we get the header printed out when we want it,
 255          * add /dev/null to the paths to grep.  This is unnecessary
 256          * (and wrong) with "-l" or "-L", which always print out the
 257          * name anyway.
 258          *
 259          * GNU grep has "-H", but this is portable.
 260          */
 261         if (!opt->name_only && !opt->unmatch_name_only)
 262                 push_arg("/dev/null");
 263
 264         hit = 0;
 265         argc = nr;
 266         for (i = 0; i < active_nr; i++) {
 267                 struct cache_entry *ce = active_cache[i];
 268                 char *name;
 269                 if (!S_ISREG(ntohl(ce->ce_mode)))
 270                         continue;
 271                 if (!pathspec_matches(paths, ce->name))
 272                         continue;
 273                 name = ce->name;
 274                 if (name[0] == '-') {
 275                         int len = ce_namelen(ce);
 276                         name = xmalloc(len + 3);
 277                         memcpy(name, "./", 2);
 278                         memcpy(name + 2, ce->name, len + 1);
 279                 }
 280                 argv[argc++] = name;
 281                 if (argc < MAXARGS && !ce_stage(ce))
 282                         continue;
 283                 status = exec_grep(argc, argv);
 284                 if (0 < status)
 285                         hit = 1;
 286                 argc = nr;
 287                 if (ce_stage(ce)) {
 288                         do {
 289                                 i++;
 290                         } while (i < active_nr &&
 291                                  !strcmp(ce->name, active_cache[i]->name));
 292                         i--; /* compensate for loop control */
 293                 }
 294         }
 295         if (argc > nr) {
 296                 status = exec_grep(argc, argv);
 297                 if (0 < status)
 298                         hit = 1;
 299         }
 300         return hit;
 301 }
 302 #endif
 303
 304 static int grep_cache(struct grep_opt *opt, const char **paths, int cached)
 305 {
 306         int hit = 0;
 307         int nr;
 308         read_cache();
 309
 310 #ifdef __unix__
 311         /*
 312          * Use the external "grep" command for the case where
 313          * we grep through the checked-out files. It tends to
 314          * be a lot more optimized
 315          */
 316         if (!cached) {
 317                 hit = external_grep(opt, paths, cached);
 318                 if (hit >= 0)
 319                         return hit;
 320         }
 321 #endif
 322
 323         for (nr = 0; nr < active_nr; nr++) {
 324                 struct cache_entry *ce = active_cache[nr];
 325                 if (!S_ISREG(ntohl(ce->ce_mode)))
 326                         continue;
 327                 if (!pathspec_matches(paths, ce->name))
 328                         continue;
 329                 if (cached) {
 330                         if (ce_stage(ce))
 331                                 continue;
 332                         hit |= grep_sha1(opt, ce->sha1, ce->name, 0);
 333                 }
 334                 else
 335                         hit |= grep_file(opt, ce->name);
 336                 if (ce_stage(ce)) {
 337                         do {
 338                                 nr++;
 339                         } while (nr < active_nr &&
 340                                  !strcmp(ce->name, active_cache[nr]->name));
 341                         nr--; /* compensate for loop control */
 342                 }
 343         }
 344         free_grep_patterns(opt);
 345         return hit;
 346 }
 347
 348 static int grep_tree(struct grep_opt *opt, const char **paths,
 349                      struct tree_desc *tree,
 350                      const char *tree_name, const char *base)
 351 {
 352         int len;
 353         int hit = 0;
 354         struct name_entry entry;
 355         char *down;
 356         int tn_len = strlen(tree_name);
 357         char *path_buf = xmalloc(PATH_MAX + tn_len + 100);
 358
 359         if (tn_len) {
 360                 tn_len = sprintf(path_buf, "%s:", tree_name);
 361                 down = path_buf + tn_len;
 362                 strcat(down, base);
 363         }
 364         else {
 365                 down = path_buf;
 366                 strcpy(down, base);
 367         }
 368         len = strlen(path_buf);
 369
 370         while (tree_entry(tree, &entry)) {
 371                 strcpy(path_buf + len, entry.path);
 372
 373                 if (S_ISDIR(entry.mode))
 374                         /* Match "abc/" against pathspec to
 375                          * decide if we want to descend into "abc"
 376                          * directory.
 377                          */
 378                         strcpy(path_buf + len + entry.pathlen, "/");
 379
 380                 if (!pathspec_matches(paths, down))
 381                         ;
 382                 else if (S_ISREG(entry.mode))
 383                         hit |= grep_sha1(opt, entry.sha1, path_buf, tn_len);
 384                 else if (S_ISDIR(entry.mode)) {
 385                         enum object_type type;
 386                         struct tree_desc sub;
 387                         void *data;
 388                         data = read_sha1_file(entry.sha1, &type, &sub.size);
 389                         if (!data)
 390                                 die("unable to read tree (%s)",
 391                                     sha1_to_hex(entry.sha1));
 392                         sub.buf = data;
 393                         hit |= grep_tree(opt, paths, &sub, tree_name, down);
 394                         free(data);
 395                 }
 396         }
 397         return hit;
 398 }
 399
 400 static int grep_object(struct grep_opt *opt, const char **paths,
 401                        struct object *obj, const char *name)
 402 {
 403         if (obj->type == OBJ_BLOB)
 404                 return grep_sha1(opt, obj->sha1, name, 0);
 405         if (obj->type == OBJ_COMMIT || obj->type == OBJ_TREE) {
 406                 struct tree_desc tree;
 407                 void *data;
 408                 int hit;
 409                 data = read_object_with_reference(obj->sha1, tree_type,
 410                                                   &tree.size, NULL);
 411                 if (!data)
 412                         die("unable to read tree (%s)", sha1_to_hex(obj->sha1));
 413                 tree.buf = data;
 414                 hit = grep_tree(opt, paths, &tree, name, "");
 415                 free(data);
 416                 return hit;
 417         }
 418         die("unable to grep from object of type %s", typename(obj->type));
 419 }
 420
 421 static const char builtin_grep_usage[] =
 422 "git-grep <option>* <rev>* [-e] <pattern> [<path>...]";
 423
 424 static const char emsg_invalid_context_len[] =
 425 "%s: invalid context length argument";
 426 static const char emsg_missing_context_len[] =
 427 "missing context length argument";
 428 static const char emsg_missing_argument[] =
 429 "option requires an argument -%s";
 430
 431 int cmd_grep(int argc, const char **argv, const char *prefix)
 432 {
 433         int hit = 0;
 434         int cached = 0;
 435         int seen_dashdash = 0;
 436         struct grep_opt opt;
 437         struct object_array list = { 0, 0, NULL };
 438         const char **paths = NULL;
 439         int i;
 440
 441         memset(&opt, 0, sizeof(opt));
 442         opt.prefix_length = (prefix && *prefix) ? strlen(prefix) : 0;
 443         opt.relative = 1;
 444         opt.pathname = 1;
 445         opt.pattern_tail = &opt.pattern_list;
 446         opt.regflags = REG_NEWLINE;
 447
 448         /*
 449          * If there is no -- then the paths must exist in the working
 450          * tree.  If there is no explicit pattern specified with -e or
 451          * -f, we take the first unrecognized non option to be the
 452          * pattern, but then what follows it must be zero or more
 453          * valid refs up to the -- (if exists), and then existing
 454          * paths.  If there is an explicit pattern, then the first
 455          * unrecognized non option is the beginning of the refs list
 456          * that continues up to the -- (if exists), and then paths.
 457          */
 458
 459         while (1 < argc) {
 460                 const char *arg = argv[1];
 461                 argc--; argv++;
 462                 if (!strcmp("--cached", arg)) {
 463                         cached = 1;
 464                         continue;
 465                 }
 466                 if (!strcmp("-a", arg) ||
 467                     !strcmp("--text", arg)) {
 468                         opt.binary = GREP_BINARY_TEXT;
 469                         continue;
 470                 }
 471                 if (!strcmp("-i", arg) ||
 472                     !strcmp("--ignore-case", arg)) {
 473                         opt.regflags |= REG_ICASE;
 474                         continue;
 475                 }
 476                 if (!strcmp("-I", arg)) {
 477                         opt.binary = GREP_BINARY_NOMATCH;
 478                         continue;
 479                 }
 480                 if (!strcmp("-v", arg) ||
 481                     !strcmp("--invert-match", arg)) {
 482                         opt.invert = 1;
 483                         continue;
 484                 }
 485                 if (!strcmp("-E", arg) ||
 486                     !strcmp("--extended-regexp", arg)) {
 487                         opt.regflags |= REG_EXTENDED;
 488                         continue;
 489                 }
 490                 if (!strcmp("-F", arg) ||
 491                     !strcmp("--fixed-strings", arg)) {
 492                         opt.fixed = 1;
 493                         continue;
 494                 }
 495                 if (!strcmp("-G", arg) ||
 496                     !strcmp("--basic-regexp", arg)) {
 497                         opt.regflags &= ~REG_EXTENDED;
 498                         continue;
 499                 }
 500                 if (!strcmp("-n", arg)) {
 501                         opt.linenum = 1;
 502                         continue;
 503                 }
 504                 if (!strcmp("-h", arg)) {
 505                         opt.pathname = 0;
 506                         continue;
 507                 }
 508                 if (!strcmp("-H", arg)) {
 509                         opt.pathname = 1;
 510                         continue;
 511                 }
 512                 if (!strcmp("-l", arg) ||
 513                     !strcmp("--files-with-matches", arg)) {
 514                         opt.name_only = 1;
 515                         continue;
 516                 }
 517                 if (!strcmp("-L", arg) ||
 518                     !strcmp("--files-without-match", arg)) {
 519                         opt.unmatch_name_only = 1;
 520                         continue;
 521                 }
 522                 if (!strcmp("-c", arg) ||
 523                     !strcmp("--count", arg)) {
 524                         opt.count = 1;
 525                         continue;
 526                 }
 527                 if (!strcmp("-w", arg) ||
 528                     !strcmp("--word-regexp", arg)) {
 529                         opt.word_regexp = 1;
 530                         continue;
 531                 }
 532                 if (!prefixcmp(arg, "-A") ||
 533                     !prefixcmp(arg, "-B") ||
 534                     !prefixcmp(arg, "-C") ||
 535                     (arg[0] == '-' && '1' <= arg[1] && arg[1] <= '9')) {
 536                         unsigned num;
 537                         const char *scan;
 538                         switch (arg[1]) {
 539                         case 'A': case 'B': case 'C':
 540                                 if (!arg[2]) {
 541                                         if (argc <= 1)
 542                                                 die(emsg_missing_context_len);
 543                                         scan = *++argv;
 544                                         argc--;
 545                                 }
 546                                 else
 547                                         scan = arg + 2;
 548                                 break;
 549                         default:
 550                                 scan = arg + 1;
 551                                 break;
 552                         }
 553                         if (sscanf(scan, "%u", &num) != 1)
 554                                 die(emsg_invalid_context_len, scan);
 555                         switch (arg[1]) {
 556                         case 'A':
 557                                 opt.post_context = num;
 558                                 break;
 559                         default:
 560                         case 'C':
 561                                 opt.post_context = num;
 562                         case 'B':
 563                                 opt.pre_context = num;
 564                                 break;
 565                         }
 566                         continue;
 567                 }
 568                 if (!strcmp("-f", arg)) {
 569                         FILE *patterns;
 570                         int lno = 0;
 571                         char buf[1024];
 572                         if (argc <= 1)
 573                                 die(emsg_missing_argument, arg);
 574                         patterns = fopen(argv[1], "r");
 575                         if (!patterns)
 576                                 die("'%s': %s", argv[1], strerror(errno));
 577                         while (fgets(buf, sizeof(buf), patterns)) {
 578                                 int len = strlen(buf);
 579                                 if (buf[len-1] == '\n')
 580                                         buf[len-1] = 0;
 581                                 /* ignore empty line like grep does */
 582                                 if (!buf[0])
 583                                         continue;
 584                                 append_grep_pattern(&opt, xstrdup(buf),
 585                                                     argv[1], ++lno,
 586                                                     GREP_PATTERN);
 587                         }
 588                         fclose(patterns);
 589                         argv++;
 590                         argc--;
 591                         continue;
 592                 }
 593                 if (!strcmp("--not", arg)) {
 594                         append_grep_pattern(&opt, arg, "command line", 0,
 595                                             GREP_NOT);
 596                         continue;
 597                 }
 598                 if (!strcmp("--and", arg)) {
 599                         append_grep_pattern(&opt, arg, "command line", 0,
 600                                             GREP_AND);
 601                         continue;
 602                 }
 603                 if (!strcmp("--or", arg))
 604                         continue; /* no-op */
 605                 if (!strcmp("(", arg)) {
 606                         append_grep_pattern(&opt, arg, "command line", 0,
 607                                             GREP_OPEN_PAREN);
 608                         continue;
 609                 }
 610                 if (!strcmp(")", arg)) {
 611                         append_grep_pattern(&opt, arg, "command line", 0,
 612                                             GREP_CLOSE_PAREN);
 613                         continue;
 614                 }
 615                 if (!strcmp("--all-match", arg)) {
 616                         opt.all_match = 1;
 617                         continue;
 618                 }
 619                 if (!strcmp("-e", arg)) {
 620                         if (1 < argc) {
 621                                 append_grep_pattern(&opt, argv[1],
 622                                                     "-e option", 0,
 623                                                     GREP_PATTERN);
 624                                 argv++;
 625                                 argc--;
 626                                 continue;
 627                         }
 628                         die(emsg_missing_argument, arg);
 629                 }
 630                 if (!strcmp("--full-name", arg)) {
 631                         opt.relative = 0;
 632                         continue;
 633                 }
 634                 if (!strcmp("--", arg)) {
 635                         /* later processing wants to have this at argv[1] */
 636                         argv--;
 637                         argc++;
 638                         break;
 639                 }
 640                 if (*arg == '-')
 641                         usage(builtin_grep_usage);
 642
 643                 /* First unrecognized non-option token */
 644                 if (!opt.pattern_list) {
 645                         append_grep_pattern(&opt, arg, "command line", 0,
 646                                             GREP_PATTERN);
 647                         break;
 648                 }
 649                 else {
 650                         /* We are looking at the first path or rev;
 651                          * it is found at argv[1] after leaving the
 652                          * loop.
 653                          */
 654                         argc++; argv--;
 655                         break;
 656                 }
 657         }
 658
 659         if (!opt.pattern_list)
 660                 die("no pattern given.");
 661         if ((opt.regflags != REG_NEWLINE) && opt.fixed)
 662                 die("cannot mix --fixed-strings and regexp");
 663         compile_grep_patterns(&opt);
 664
 665         /* Check revs and then paths */
 666         for (i = 1; i < argc; i++) {
 667                 const char *arg = argv[i];
 668                 unsigned char sha1[20];
 669                 /* Is it a rev? */
 670                 if (!get_sha1(arg, sha1)) {
 671                         struct object *object = parse_object(sha1);
 672                         if (!object)
 673                                 die("bad object %s", arg);
 674                         add_object_array(object, arg, &list);
 675                         continue;
 676                 }
 677                 if (!strcmp(arg, "--")) {
 678                         i++;
 679                         seen_dashdash = 1;
 680                 }
 681                 break;
 682         }
 683
 684         /* The rest are paths */
 685         if (!seen_dashdash) {
 686                 int j;
 687                 for (j = i; j < argc; j++)
 688                         verify_filename(prefix, argv[j]);
 689         }
 690
 691         if (i < argc) {
 692                 paths = get_pathspec(prefix, argv + i);
 693                 if (opt.prefix_length && opt.relative) {
 694                         /* Make sure we do not get outside of paths */
 695                         for (i = 0; paths[i]; i++)
 696                                 if (strncmp(prefix, paths[i], opt.prefix_length))
 697                                         die("git-grep: cannot generate relative filenames containing '..'");
 698                 }
 699         }
 700         else if (prefix) {
 701                 paths = xcalloc(2, sizeof(const char *));
 702                 paths[0] = prefix;
 703                 paths[1] = NULL;
 704         }
 705
 706         if (!list.nr)
 707                 return !grep_cache(&opt, paths, cached);
 708
 709         if (cached)
 710                 die("both --cached and trees are given.");
 711
 712         for (i = 0; i < list.nr; i++) {
 713                 struct object *real_obj;
 714                 real_obj = deref_tag(list.objects[i].item, NULL, 0);
 715                 if (grep_object(&opt, paths, real_obj, list.objects[i].name))
 716                         hit = 1;
 717         }
 718         free_grep_patterns(&opt);
 719         return !hit;
 720 }