mansearch.c

   1 /*      $Id: mansearch.c,v 1.54 2015/02/27 16:02:10 schwarze Exp $ */
   2 /*
   3  * Copyright (c) 2012 Kristaps Dzonsons <kristaps@bsd.lv>
   4  * Copyright (c) 2013, 2014, 2015 Ingo Schwarze <schwarze@openbsd.org>
   5  *
   6  * Permission to use, copy, modify, and distribute this software for any
   7  * purpose with or without fee is hereby granted, provided that the above
   8  * copyright notice and this permission notice appear in all copies.
   9  *
  10  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  11  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  12  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  13  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  14  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  15  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  16  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  17  */
  18 #include "config.h"
  19
  20 #include <sys/mman.h>
  21 #include <sys/types.h>
  22
  23 #include <assert.h>
  24 #include <errno.h>
  25 #include <fcntl.h>
  26 #include <getopt.h>
  27 #include <glob.h>
  28 #include <limits.h>
  29 #include <regex.h>
  30 #include <stdio.h>
  31 #include <stdint.h>
  32 #include <stddef.h>
  33 #include <stdlib.h>
  34 #include <string.h>
  35 #include <unistd.h>
  36
  37 #if HAVE_OHASH
  38 #include <ohash.h>
  39 #else
  40 #include "compat_ohash.h"
  41 #endif
  42 #include <sqlite3.h>
  43 #ifndef SQLITE_DETERMINISTIC
  44 #define SQLITE_DETERMINISTIC 0
  45 #endif
  46
  47 #include "mandoc.h"
  48 #include "mandoc_aux.h"
  49 #include "manpath.h"
  50 #include "mansearch.h"
  51
  52 extern int mansearch_keymax;
  53 extern const char *const mansearch_keynames[];
  54
  55 #define SQL_BIND_TEXT(_db, _s, _i, _v) \
  56         do { if (SQLITE_OK != sqlite3_bind_text \
  57                 ((_s), (_i)++, (_v), -1, SQLITE_STATIC)) \
  58                 fprintf(stderr, "%s\n", sqlite3_errmsg((_db))); \
  59         } while (0)
  60 #define SQL_BIND_INT64(_db, _s, _i, _v) \
  61         do { if (SQLITE_OK != sqlite3_bind_int64 \
  62                 ((_s), (_i)++, (_v))) \
  63                 fprintf(stderr, "%s\n", sqlite3_errmsg((_db))); \
  64         } while (0)
  65 #define SQL_BIND_BLOB(_db, _s, _i, _v) \
  66         do { if (SQLITE_OK != sqlite3_bind_blob \
  67                 ((_s), (_i)++, (&_v), sizeof(_v), SQLITE_STATIC)) \
  68                 fprintf(stderr, "%s\n", sqlite3_errmsg((_db))); \
  69         } while (0)
  70
  71 struct  expr {
  72         regex_t          regexp;  /* compiled regexp, if applicable */
  73         const char      *substr;  /* to search for, if applicable */
  74         struct expr     *next;    /* next in sequence */
  75         uint64_t         bits;    /* type-mask */
  76         int              equal;   /* equality, not subsring match */
  77         int              open;    /* opening parentheses before */
  78         int              and;     /* logical AND before */
  79         int              close;   /* closing parentheses after */
  80 };
  81
  82 struct  match {
  83         uint64_t         pageid; /* identifier in database */
  84         uint64_t         bits; /* name type mask */
  85         char            *desc; /* manual page description */
  86         int              form; /* bit field: formatted, zipped? */
  87 };
  88
  89 static  void             buildnames(const struct mansearch *,
  90                                 struct manpage *, sqlite3 *,
  91                                 sqlite3_stmt *, uint64_t,
  92                                 const char *, int form);
  93 static  char            *buildoutput(sqlite3 *, sqlite3_stmt *,
  94                                  uint64_t, uint64_t);
  95 static  void            *hash_alloc(size_t, void *);
  96 static  void             hash_free(void *, void *);
  97 static  void            *hash_calloc(size_t, size_t, void *);
  98 static  struct expr     *exprcomp(const struct mansearch *,
  99                                 int, char *[]);
 100 static  void             exprfree(struct expr *);
 101 static  struct expr     *exprterm(const struct mansearch *, char *, int);
 102 static  int              manpage_compare(const void *, const void *);
 103 static  void             sql_append(char **sql, size_t *sz,
 104                                 const char *newstr, int count);
 105 static  void             sql_match(sqlite3_context *context,
 106                                 int argc, sqlite3_value **argv);
 107 static  void             sql_regexp(sqlite3_context *context,
 108                                 int argc, sqlite3_value **argv);
 109 static  char            *sql_statement(const struct expr *);
 110
 111
 112 int
 113 mansearch_setup(int start)
 114 {
 115         static void     *pagecache;
 116         int              c;
 117
 118 #define PC_PAGESIZE     1280
 119 #define PC_NUMPAGES     256
 120
 121         if (start) {
 122                 if (NULL != pagecache) {
 123                         fprintf(stderr, "pagecache already enabled\n");
 124                         return((int)MANDOCLEVEL_BADARG);
 125                 }
 126
 127                 pagecache = mmap(NULL, PC_PAGESIZE * PC_NUMPAGES,
 128                     PROT_READ | PROT_WRITE,
 129                     MAP_SHARED | MAP_ANON, -1, 0);
 130
 131                 if (MAP_FAILED == pagecache) {
 132                         perror("mmap");
 133                         pagecache = NULL;
 134                         return((int)MANDOCLEVEL_SYSERR);
 135                 }
 136
 137                 c = sqlite3_config(SQLITE_CONFIG_PAGECACHE,
 138                     pagecache, PC_PAGESIZE, PC_NUMPAGES);
 139
 140                 if (SQLITE_OK == c)
 141                         return((int)MANDOCLEVEL_OK);
 142
 143                 fprintf(stderr, "pagecache: %s\n", sqlite3_errstr(c));
 144
 145         } else if (NULL == pagecache) {
 146                 fprintf(stderr, "pagecache missing\n");
 147                 return((int)MANDOCLEVEL_BADARG);
 148         }
 149
 150         if (-1 == munmap(pagecache, PC_PAGESIZE * PC_NUMPAGES)) {
 151                 perror("munmap");
 152                 pagecache = NULL;
 153                 return((int)MANDOCLEVEL_SYSERR);
 154         }
 155
 156         pagecache = NULL;
 157         return((int)MANDOCLEVEL_OK);
 158 }
 159
 160 int
 161 mansearch(const struct mansearch *search,
 162                 const struct manpaths *paths,
 163                 int argc, char *argv[],
 164                 struct manpage **res, size_t *sz)
 165 {
 166         int              fd, rc, c, indexbit;
 167         int64_t          pageid;
 168         uint64_t         outbit, iterbit;
 169         char             buf[PATH_MAX];
 170         char            *sql;
 171         struct manpage  *mpage;
 172         struct expr     *e, *ep;
 173         sqlite3         *db;
 174         sqlite3_stmt    *s, *s2;
 175         struct match    *mp;
 176         struct ohash_info info;
 177         struct ohash     htab;
 178         unsigned int     idx;
 179         size_t           i, j, cur, maxres;
 180
 181         info.calloc = hash_calloc;
 182         info.alloc = hash_alloc;
 183         info.free = hash_free;
 184         info.key_offset = offsetof(struct match, pageid);
 185
 186         *sz = cur = maxres = 0;
 187         sql = NULL;
 188         *res = NULL;
 189         fd = -1;
 190         e = NULL;
 191         rc = 0;
 192
 193         if (0 == argc)
 194                 goto out;
 195         if (NULL == (e = exprcomp(search, argc, argv)))
 196                 goto out;
 197
 198         outbit = 0;
 199         if (NULL != search->outkey) {
 200                 for (indexbit = 0, iterbit = 1;
 201                      indexbit < mansearch_keymax;
 202                      indexbit++, iterbit <<= 1) {
 203                         if (0 == strcasecmp(search->outkey,
 204                             mansearch_keynames[indexbit])) {
 205                                 outbit = iterbit;
 206                                 break;
 207                         }
 208                 }
 209         }
 210
 211         /*
 212          * Save a descriptor to the current working directory.
 213          * Since pathnames in the "paths" variable might be relative,
 214          * and we'll be chdir()ing into them, we need to keep a handle
 215          * on our current directory from which to start the chdir().
 216          */
 217
 218         if (NULL == getcwd(buf, PATH_MAX)) {
 219                 perror("getcwd");
 220                 goto out;
 221         } else if (-1 == (fd = open(buf, O_RDONLY, 0))) {
 222                 perror(buf);
 223                 goto out;
 224         }
 225
 226         sql = sql_statement(e);
 227
 228         /*
 229          * Loop over the directories (containing databases) for us to
 230          * search.
 231          * Don't let missing/bad databases/directories phase us.
 232          * In each, try to open the resident database and, if it opens,
 233          * scan it for our match expression.
 234          */
 235
 236         for (i = 0; i < paths->sz; i++) {
 237                 if (-1 == fchdir(fd)) {
 238                         perror(buf);
 239                         free(*res);
 240                         break;
 241                 } else if (-1 == chdir(paths->paths[i])) {
 242                         perror(paths->paths[i]);
 243                         continue;
 244                 }
 245
 246                 c = sqlite3_open_v2(MANDOC_DB, &db,
 247                     SQLITE_OPEN_READONLY, NULL);
 248
 249                 if (SQLITE_OK != c) {
 250                         fprintf(stderr, "%s/%s: %s\n",
 251                             paths->paths[i], MANDOC_DB, strerror(errno));
 252                         sqlite3_close(db);
 253                         continue;
 254                 }
 255
 256                 /*
 257                  * Define the SQL functions for substring
 258                  * and regular expression matching.
 259                  */
 260
 261                 c = sqlite3_create_function(db, "match", 2,
 262                     SQLITE_UTF8 | SQLITE_DETERMINISTIC,
 263                     NULL, sql_match, NULL, NULL);
 264                 assert(SQLITE_OK == c);
 265                 c = sqlite3_create_function(db, "regexp", 2,
 266                     SQLITE_UTF8 | SQLITE_DETERMINISTIC,
 267                     NULL, sql_regexp, NULL, NULL);
 268                 assert(SQLITE_OK == c);
 269
 270                 j = 1;
 271                 c = sqlite3_prepare_v2(db, sql, -1, &s, NULL);
 272                 if (SQLITE_OK != c)
 273                         fprintf(stderr, "%s\n", sqlite3_errmsg(db));
 274
 275                 for (ep = e; NULL != ep; ep = ep->next) {
 276                         if (NULL == ep->substr) {
 277                                 SQL_BIND_BLOB(db, s, j, ep->regexp);
 278                         } else
 279                                 SQL_BIND_TEXT(db, s, j, ep->substr);
 280                         if (0 == ((TYPE_Nd | TYPE_Nm) & ep->bits))
 281                                 SQL_BIND_INT64(db, s, j, ep->bits);
 282                 }
 283
 284                 memset(&htab, 0, sizeof(struct ohash));
 285                 ohash_init(&htab, 4, &info);
 286
 287                 /*
 288                  * Hash each entry on its [unique] document identifier.
 289                  * This is a uint64_t.
 290                  * Instead of using a hash function, simply convert the
 291                  * uint64_t to a uint32_t, the hash value's type.
 292                  * This gives good performance and preserves the
 293                  * distribution of buckets in the table.
 294                  */
 295                 while (SQLITE_ROW == (c = sqlite3_step(s))) {
 296                         pageid = sqlite3_column_int64(s, 2);
 297                         idx = ohash_lookup_memory(&htab,
 298                             (char *)&pageid, sizeof(uint64_t),
 299                             (uint32_t)pageid);
 300
 301                         if (NULL != ohash_find(&htab, idx))
 302                                 continue;
 303
 304                         mp = mandoc_calloc(1, sizeof(struct match));
 305                         mp->pageid = pageid;
 306                         mp->form = sqlite3_column_int(s, 1);
 307                         mp->bits = sqlite3_column_int64(s, 3);
 308                         if (TYPE_Nd == outbit)
 309                                 mp->desc = mandoc_strdup((const char *)
 310                                     sqlite3_column_text(s, 0));
 311                         ohash_insert(&htab, idx, mp);
 312                 }
 313
 314                 if (SQLITE_DONE != c)
 315                         fprintf(stderr, "%s\n", sqlite3_errmsg(db));
 316
 317                 sqlite3_finalize(s);
 318
 319                 c = sqlite3_prepare_v2(db,
 320                     "SELECT sec, arch, name, pageid FROM mlinks "
 321                     "WHERE pageid=? ORDER BY sec, arch, name",
 322                     -1, &s, NULL);
 323                 if (SQLITE_OK != c)
 324                         fprintf(stderr, "%s\n", sqlite3_errmsg(db));
 325
 326                 c = sqlite3_prepare_v2(db,
 327                     "SELECT bits, key, pageid FROM keys "
 328                     "WHERE pageid=? AND bits & ?",
 329                     -1, &s2, NULL);
 330                 if (SQLITE_OK != c)
 331                         fprintf(stderr, "%s\n", sqlite3_errmsg(db));
 332
 333                 for (mp = ohash_first(&htab, &idx);
 334                                 NULL != mp;
 335                                 mp = ohash_next(&htab, &idx)) {
 336                         if (cur + 1 > maxres) {
 337                                 maxres += 1024;
 338                                 *res = mandoc_reallocarray(*res,
 339                                     maxres, sizeof(struct manpage));
 340                         }
 341                         mpage = *res + cur;
 342                         mpage->ipath = i;
 343                         mpage->bits = mp->bits;
 344                         mpage->sec = 10;
 345                         mpage->form = mp->form;
 346                         buildnames(search, mpage, db, s, mp->pageid,
 347                             paths->paths[i], mp->form);
 348                         if (mpage->names != NULL) {
 349                                 mpage->output = TYPE_Nd & outbit ?
 350                                     mp->desc : outbit ?
 351                                     buildoutput(db, s2, mp->pageid, outbit) :
 352                                     NULL;
 353                                 cur++;
 354                         }
 355                         free(mp);
 356                 }
 357
 358                 sqlite3_finalize(s);
 359                 sqlite3_finalize(s2);
 360                 sqlite3_close(db);
 361                 ohash_delete(&htab);
 362
 363                 /*
 364                  * In man(1) mode, prefer matches in earlier trees
 365                  * over matches in later trees.
 366                  */
 367
 368                 if (cur && search->firstmatch)
 369                         break;
 370         }
 371         qsort(*res, cur, sizeof(struct manpage), manpage_compare);
 372         rc = 1;
 373 out:
 374         if (-1 != fd) {
 375                 if (-1 == fchdir(fd))
 376                         perror(buf);
 377                 close(fd);
 378         }
 379         exprfree(e);
 380         free(sql);
 381         *sz = cur;
 382         return(rc);
 383 }
 384
 385 void
 386 mansearch_free(struct manpage *res, size_t sz)
 387 {
 388         size_t   i;
 389
 390         for (i = 0; i < sz; i++) {
 391                 free(res[i].file);
 392                 free(res[i].names);
 393                 free(res[i].output);
 394         }
 395         free(res);
 396 }
 397
 398 static int
 399 manpage_compare(const void *vp1, const void *vp2)
 400 {
 401         const struct manpage    *mp1, *mp2;
 402         int                      diff;
 403
 404         mp1 = vp1;
 405         mp2 = vp2;
 406         return( (diff = mp2->bits - mp1->bits) ? diff :
 407                 (diff = mp1->sec - mp2->sec) ? diff :
 408                 strcasecmp(mp1->names, mp2->names));
 409 }
 410
 411 static void
 412 buildnames(const struct mansearch *search, struct manpage *mpage,
 413                 sqlite3 *db, sqlite3_stmt *s,
 414                 uint64_t pageid, const char *path, int form)
 415 {
 416         glob_t           globinfo;
 417         char            *firstname, *newnames, *prevsec, *prevarch;
 418         const char      *oldnames, *sep1, *name, *sec, *sep2, *arch, *fsec;
 419         size_t           i;
 420         int              c, globres;
 421
 422         mpage->file = NULL;
 423         mpage->names = NULL;
 424         firstname = prevsec = prevarch = NULL;
 425         i = 1;
 426         SQL_BIND_INT64(db, s, i, pageid);
 427         while (SQLITE_ROW == (c = sqlite3_step(s))) {
 428
 429                 /* Decide whether we already have some names. */
 430
 431                 if (NULL == mpage->names) {
 432                         oldnames = "";
 433                         sep1 = "";
 434                 } else {
 435                         oldnames = mpage->names;
 436                         sep1 = ", ";
 437                 }
 438
 439                 /* Fetch the next name, rejecting sec/arch mismatches. */
 440
 441                 sec = (const char *)sqlite3_column_text(s, 0);
 442                 if (search->sec != NULL && strcasecmp(sec, search->sec))
 443                         continue;
 444                 arch = (const char *)sqlite3_column_text(s, 1);
 445                 if (search->arch != NULL && *arch != '\0' &&
 446                     strcasecmp(arch, search->arch))
 447                         continue;
 448                 name = (const char *)sqlite3_column_text(s, 2);
 449
 450                 /* Remember the first section found. */
 451
 452                 if (9 < mpage->sec && '1' <= *sec && '9' >= *sec)
 453                         mpage->sec = (*sec - '1') + 1;
 454
 455                 /* If the section changed, append the old one. */
 456
 457                 if (NULL != prevsec &&
 458                     (strcmp(sec, prevsec) ||
 459                      strcmp(arch, prevarch))) {
 460                         sep2 = '\0' == *prevarch ? "" : "/";
 461                         mandoc_asprintf(&newnames, "%s(%s%s%s)",
 462                             oldnames, prevsec, sep2, prevarch);
 463                         free(mpage->names);
 464                         oldnames = mpage->names = newnames;
 465                         free(prevsec);
 466                         free(prevarch);
 467                         prevsec = prevarch = NULL;
 468                 }
 469
 470                 /* Save the new section, to append it later. */
 471
 472                 if (NULL == prevsec) {
 473                         prevsec = mandoc_strdup(sec);
 474                         prevarch = mandoc_strdup(arch);
 475                 }
 476
 477                 /* Append the new name. */
 478
 479                 mandoc_asprintf(&newnames, "%s%s%s",
 480                     oldnames, sep1, name);
 481                 free(mpage->names);
 482                 mpage->names = newnames;
 483
 484                 /* Also save the first file name encountered. */
 485
 486                 if (mpage->file != NULL)
 487                         continue;
 488
 489                 if (form & FORM_SRC) {
 490                         sep1 = "man";
 491                         fsec = sec;
 492                 } else {
 493                         sep1 = "cat";
 494                         fsec = "0";
 495                 }
 496                 sep2 = *arch == '\0' ? "" : "/";
 497                 mandoc_asprintf(&mpage->file, "%s/%s%s%s%s/%s.%s",
 498                     path, sep1, sec, sep2, arch, name, fsec);
 499                 if (access(mpage->file, R_OK) != -1)
 500                         continue;
 501
 502                 /* Handle unusual file name extensions. */
 503
 504                 if (firstname == NULL)
 505                         firstname = mpage->file;
 506                 else
 507                         free(mpage->file);
 508                 mandoc_asprintf(&mpage->file, "%s/%s%s%s%s/%s.*",
 509                     path, sep1, sec, sep2, arch, name);
 510                 globres = glob(mpage->file, 0, NULL, &globinfo);
 511                 free(mpage->file);
 512                 mpage->file = globres ? NULL :
 513                     mandoc_strdup(*globinfo.gl_pathv);
 514                 globfree(&globinfo);
 515         }
 516         if (c != SQLITE_DONE)
 517                 fprintf(stderr, "%s\n", sqlite3_errmsg(db));
 518         sqlite3_reset(s);
 519
 520         /* If none of the files is usable, use the first name. */
 521
 522         if (mpage->file == NULL)
 523                 mpage->file = firstname;
 524         else if (mpage->file != firstname)
 525                 free(firstname);
 526
 527         /* Append one final section to the names. */
 528
 529         if (prevsec != NULL) {
 530                 sep2 = *prevarch == '\0' ? "" : "/";
 531                 mandoc_asprintf(&newnames, "%s(%s%s%s)",
 532                     mpage->names, prevsec, sep2, prevarch);
 533                 free(mpage->names);
 534                 mpage->names = newnames;
 535                 free(prevsec);
 536                 free(prevarch);
 537         }
 538 }
 539
 540 static char *
 541 buildoutput(sqlite3 *db, sqlite3_stmt *s, uint64_t pageid, uint64_t outbit)
 542 {
 543         char            *output, *newoutput;
 544         const char      *oldoutput, *sep1, *data;
 545         size_t           i;
 546         int              c;
 547
 548         output = NULL;
 549         i = 1;
 550         SQL_BIND_INT64(db, s, i, pageid);
 551         SQL_BIND_INT64(db, s, i, outbit);
 552         while (SQLITE_ROW == (c = sqlite3_step(s))) {
 553                 if (NULL == output) {
 554                         oldoutput = "";
 555                         sep1 = "";
 556                 } else {
 557                         oldoutput = output;
 558                         sep1 = " # ";
 559                 }
 560                 data = (const char *)sqlite3_column_text(s, 1);
 561                 mandoc_asprintf(&newoutput, "%s%s%s",
 562                     oldoutput, sep1, data);
 563                 free(output);
 564                 output = newoutput;
 565         }
 566         if (SQLITE_DONE != c)
 567                 fprintf(stderr, "%s\n", sqlite3_errmsg(db));
 568         sqlite3_reset(s);
 569         return(output);
 570 }
 571
 572 /*
 573  * Implement substring match as an application-defined SQL function.
 574  * Using the SQL LIKE or GLOB operators instead would be a bad idea
 575  * because that would require escaping metacharacters in the string
 576  * being searched for.
 577  */
 578 static void
 579 sql_match(sqlite3_context *context, int argc, sqlite3_value **argv)
 580 {
 581
 582         assert(2 == argc);
 583         sqlite3_result_int(context, NULL != strcasestr(
 584             (const char *)sqlite3_value_text(argv[1]),
 585             (const char *)sqlite3_value_text(argv[0])));
 586 }
 587
 588 /*
 589  * Implement regular expression match
 590  * as an application-defined SQL function.
 591  */
 592 static void
 593 sql_regexp(sqlite3_context *context, int argc, sqlite3_value **argv)
 594 {
 595
 596         assert(2 == argc);
 597         sqlite3_result_int(context, !regexec(
 598             (regex_t *)sqlite3_value_blob(argv[0]),
 599             (const char *)sqlite3_value_text(argv[1]),
 600             0, NULL, 0));
 601 }
 602
 603 static void
 604 sql_append(char **sql, size_t *sz, const char *newstr, int count)
 605 {
 606         size_t           newsz;
 607
 608         newsz = 1 < count ? (size_t)count : strlen(newstr);
 609         *sql = mandoc_realloc(*sql, *sz + newsz + 1);
 610         if (1 < count)
 611                 memset(*sql + *sz, *newstr, (size_t)count);
 612         else
 613                 memcpy(*sql + *sz, newstr, newsz);
 614         *sz += newsz;
 615         (*sql)[*sz] = '\0';
 616 }
 617
 618 /*
 619  * Prepare the search SQL statement.
 620  */
 621 static char *
 622 sql_statement(const struct expr *e)
 623 {
 624         char            *sql;
 625         size_t           sz;
 626         int              needop;
 627
 628         sql = mandoc_strdup(e->equal ?
 629             "SELECT desc, form, pageid, bits "
 630                 "FROM mpages NATURAL JOIN names WHERE " :
 631             "SELECT desc, form, pageid, 0 FROM mpages WHERE ");
 632         sz = strlen(sql);
 633
 634         for (needop = 0; NULL != e; e = e->next) {
 635                 if (e->and)
 636                         sql_append(&sql, &sz, " AND ", 1);
 637                 else if (needop)
 638                         sql_append(&sql, &sz, " OR ", 1);
 639                 if (e->open)
 640                         sql_append(&sql, &sz, "(", e->open);
 641                 sql_append(&sql, &sz,
 642                     TYPE_Nd & e->bits
 643                     ? (NULL == e->substr
 644                         ? "desc REGEXP ?"
 645                         : "desc MATCH ?")
 646                     : TYPE_Nm == e->bits
 647                     ? (NULL == e->substr
 648                         ? "pageid IN (SELECT pageid FROM names "
 649                           "WHERE name REGEXP ?)"
 650                         : e->equal
 651                         ? "name = ? "
 652                         : "pageid IN (SELECT pageid FROM names "
 653                           "WHERE name MATCH ?)")
 654                     : (NULL == e->substr
 655                         ? "pageid IN (SELECT pageid FROM keys "
 656                           "WHERE key REGEXP ? AND bits & ?)"
 657                         : "pageid IN (SELECT pageid FROM keys "
 658                           "WHERE key MATCH ? AND bits & ?)"), 1);
 659                 if (e->close)
 660                         sql_append(&sql, &sz, ")", e->close);
 661                 needop = 1;
 662         }
 663
 664         return(sql);
 665 }
 666
 667 /*
 668  * Compile a set of string tokens into an expression.
 669  * Tokens in "argv" are assumed to be individual expression atoms (e.g.,
 670  * "(", "foo=bar", etc.).
 671  */
 672 static struct expr *
 673 exprcomp(const struct mansearch *search, int argc, char *argv[])
 674 {
 675         uint64_t         mask;
 676         int              i, toopen, logic, igncase, toclose;
 677         struct expr     *first, *prev, *cur, *next;
 678
 679         first = cur = NULL;
 680         logic = igncase = toopen = toclose = 0;
 681
 682         for (i = 0; i < argc; i++) {
 683                 if (0 == strcmp("(", argv[i])) {
 684                         if (igncase)
 685                                 goto fail;
 686                         toopen++;
 687                         toclose++;
 688                         continue;
 689                 } else if (0 == strcmp(")", argv[i])) {
 690                         if (toopen || logic || igncase || NULL == cur)
 691                                 goto fail;
 692                         cur->close++;
 693                         if (0 > --toclose)
 694                                 goto fail;
 695                         continue;
 696                 } else if (0 == strcmp("-a", argv[i])) {
 697                         if (toopen || logic || igncase || NULL == cur)
 698                                 goto fail;
 699                         logic = 1;
 700                         continue;
 701                 } else if (0 == strcmp("-o", argv[i])) {
 702                         if (toopen || logic || igncase || NULL == cur)
 703                                 goto fail;
 704                         logic = 2;
 705                         continue;
 706                 } else if (0 == strcmp("-i", argv[i])) {
 707                         if (igncase)
 708                                 goto fail;
 709                         igncase = 1;
 710                         continue;
 711                 }
 712                 next = exprterm(search, argv[i], !igncase);
 713                 if (NULL == next)
 714                         goto fail;
 715                 if (NULL == first)
 716                         first = next;
 717                 else
 718                         cur->next = next;
 719                 prev = cur = next;
 720
 721                 /*
 722                  * Searching for descriptions must be split out
 723                  * because they are stored in the mpages table,
 724                  * not in the keys table.
 725                  */
 726
 727                 for (mask = TYPE_Nm; mask <= TYPE_Nd; mask <<= 1) {
 728                         if (mask & cur->bits && ~mask & cur->bits) {
 729                                 next = mandoc_calloc(1,
 730                                     sizeof(struct expr));
 731                                 memcpy(next, cur, sizeof(struct expr));
 732                                 prev->open = 1;
 733                                 cur->bits = mask;
 734                                 cur->next = next;
 735                                 cur = next;
 736                                 cur->bits &= ~mask;
 737                         }
 738                 }
 739                 prev->and = (1 == logic);
 740                 prev->open += toopen;
 741                 if (cur != prev)
 742                         cur->close = 1;
 743
 744                 toopen = logic = igncase = 0;
 745         }
 746         if ( ! (toopen || logic || igncase || toclose))
 747                 return(first);
 748
 749 fail:
 750         if (NULL != first)
 751                 exprfree(first);
 752         return(NULL);
 753 }
 754
 755 static struct expr *
 756 exprterm(const struct mansearch *search, char *buf, int cs)
 757 {
 758         char             errbuf[BUFSIZ];
 759         struct expr     *e;
 760         char            *key, *val;
 761         uint64_t         iterbit;
 762         int              i, irc;
 763
 764         if ('\0' == *buf)
 765                 return(NULL);
 766
 767         e = mandoc_calloc(1, sizeof(struct expr));
 768
 769         if (search->argmode == ARG_NAME) {
 770                 e->bits = TYPE_Nm;
 771                 e->substr = buf;
 772                 e->equal = 1;
 773                 return(e);
 774         }
 775
 776         /*
 777          * Separate macro keys from search string.
 778          * If needed, request regular expression handling
 779          * by setting e->substr to NULL.
 780          */
 781
 782         if (search->argmode == ARG_WORD) {
 783                 e->bits = TYPE_Nm;
 784                 e->substr = NULL;
 785                 mandoc_asprintf(&val, "[[:<:]]%s[[:>:]]", buf);
 786                 cs = 0;
 787         } else if ((val = strpbrk(buf, "=~")) == NULL) {
 788                 e->bits = TYPE_Nm | TYPE_Nd;
 789                 e->substr = buf;
 790         } else {
 791                 if (val == buf)
 792                         e->bits = TYPE_Nm | TYPE_Nd;
 793                 if ('=' == *val)
 794                         e->substr = val + 1;
 795                 *val++ = '\0';
 796                 if (NULL != strstr(buf, "arch"))
 797                         cs = 0;
 798         }
 799
 800         /* Compile regular expressions. */
 801
 802         if (NULL == e->substr) {
 803                 irc = regcomp(&e->regexp, val,
 804                     REG_EXTENDED | REG_NOSUB | (cs ? 0 : REG_ICASE));
 805                 if (search->argmode == ARG_WORD)
 806                         free(val);
 807                 if (irc) {
 808                         regerror(irc, &e->regexp, errbuf, sizeof(errbuf));
 809                         fprintf(stderr, "regcomp: %s\n", errbuf);
 810                         free(e);
 811                         return(NULL);
 812                 }
 813         }
 814
 815         if (e->bits)
 816                 return(e);
 817
 818         /*
 819          * Parse out all possible fields.
 820          * If the field doesn't resolve, bail.
 821          */
 822
 823         while (NULL != (key = strsep(&buf, ","))) {
 824                 if ('\0' == *key)
 825                         continue;
 826                 for (i = 0, iterbit = 1;
 827                      i < mansearch_keymax;
 828                      i++, iterbit <<= 1) {
 829                         if (0 == strcasecmp(key,
 830                             mansearch_keynames[i])) {
 831                                 e->bits |= iterbit;
 832                                 break;
 833                         }
 834                 }
 835                 if (i == mansearch_keymax) {
 836                         if (strcasecmp(key, "any")) {
 837                                 free(e);
 838                                 return(NULL);
 839                         }
 840                         e->bits |= ~0ULL;
 841                 }
 842         }
 843
 844         return(e);
 845 }
 846
 847 static void
 848 exprfree(struct expr *p)
 849 {
 850         struct expr     *pp;
 851
 852         while (NULL != p) {
 853                 pp = p->next;
 854                 free(p);
 855                 p = pp;
 856         }
 857 }
 858
 859 static void *
 860 hash_calloc(size_t nmemb, size_t sz, void *arg)
 861 {
 862
 863         return(mandoc_calloc(nmemb, sz));
 864 }
 865
 866 static void *
 867 hash_alloc(size_t sz, void *arg)
 868 {
 869
 870         return(mandoc_malloc(sz));
 871 }
 872
 873 static void
 874 hash_free(void *p, void *arg)
 875 {
 876
 877         free(p);
 878 }