mansearch.c

   1 /*      $Id: mansearch.c,v 1.21 2014/01/19 23:09:30 schwarze Exp $ */
   2 /*
   3  * Copyright (c) 2012 Kristaps Dzonsons <kristaps@bsd.lv>
   4  * Copyright (c) 2013, 2014 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 #ifdef HAVE_CONFIG_H
  19 #include "config.h"
  20 #endif
  21
  22 #include <assert.h>
  23 #include <fcntl.h>
  24 #include <getopt.h>
  25 #include <limits.h>
  26 #include <regex.h>
  27 #include <stdio.h>
  28 #include <stdint.h>
  29 #include <stddef.h>
  30 #include <stdlib.h>
  31 #include <string.h>
  32 #include <unistd.h>
  33
  34 #ifdef HAVE_OHASH
  35 #include <ohash.h>
  36 #else
  37 #include "compat_ohash.h"
  38 #endif
  39 #include <sqlite3.h>
  40
  41 #include "mandoc.h"
  42 #include "manpath.h"
  43 #include "mansearch.h"
  44
  45 extern int mansearch_keymax;
  46 extern const char *const mansearch_keynames[];
  47
  48 #define SQL_BIND_TEXT(_db, _s, _i, _v) \
  49         do { if (SQLITE_OK != sqlite3_bind_text \
  50                 ((_s), (_i)++, (_v), -1, SQLITE_STATIC)) \
  51                 fprintf(stderr, "%s\n", sqlite3_errmsg((_db))); \
  52         } while (0)
  53 #define SQL_BIND_INT64(_db, _s, _i, _v) \
  54         do { if (SQLITE_OK != sqlite3_bind_int64 \
  55                 ((_s), (_i)++, (_v))) \
  56                 fprintf(stderr, "%s\n", sqlite3_errmsg((_db))); \
  57         } while (0)
  58 #define SQL_BIND_BLOB(_db, _s, _i, _v) \
  59         do { if (SQLITE_OK != sqlite3_bind_blob \
  60                 ((_s), (_i)++, (&_v), sizeof(_v), SQLITE_STATIC)) \
  61                 fprintf(stderr, "%s\n", sqlite3_errmsg((_db))); \
  62         } while (0)
  63
  64 struct  expr {
  65         uint64_t         bits;    /* type-mask */
  66         const char      *substr;  /* to search for, if applicable */
  67         regex_t          regexp;  /* compiled regexp, if applicable */
  68         int              open;    /* opening parentheses before */
  69         int              and;     /* logical AND before */
  70         int              close;   /* closing parentheses after */
  71         struct expr     *next;    /* next in sequence */
  72 };
  73
  74 struct  match {
  75         uint64_t         id; /* identifier in database */
  76         int              form; /* 0 == catpage */
  77 };
  78
  79 static  void             buildnames(struct manpage *, sqlite3 *,
  80                                 sqlite3_stmt *, uint64_t,
  81                                 const char *, int form);
  82 static  char            *buildoutput(sqlite3 *, sqlite3_stmt *,
  83                                  uint64_t, uint64_t);
  84 static  void            *hash_alloc(size_t, void *);
  85 static  void             hash_free(void *, size_t, void *);
  86 static  void            *hash_halloc(size_t, void *);
  87 static  struct expr     *exprcomp(const struct mansearch *,
  88                                 int, char *[]);
  89 static  void             exprfree(struct expr *);
  90 static  struct expr     *exprspec(struct expr *, uint64_t,
  91                                  const char *, const char *);
  92 static  struct expr     *exprterm(const struct mansearch *, char *, int);
  93 static  void             sql_append(char **sql, size_t *sz,
  94                                 const char *newstr, int count);
  95 static  void             sql_match(sqlite3_context *context,
  96                                 int argc, sqlite3_value **argv);
  97 static  void             sql_regexp(sqlite3_context *context,
  98                                 int argc, sqlite3_value **argv);
  99 static  char            *sql_statement(const struct expr *);
 100
 101 int
 102 mansearch(const struct mansearch *search,
 103                 const struct manpaths *paths,
 104                 int argc, char *argv[],
 105                 const char *outkey,
 106                 struct manpage **res, size_t *sz)
 107 {
 108         int              fd, rc, c, indexbit;
 109         int64_t          id;
 110         uint64_t         outbit, iterbit;
 111         char             buf[PATH_MAX];
 112         char            *sql;
 113         struct manpage  *mpage;
 114         struct expr     *e, *ep;
 115         sqlite3         *db;
 116         sqlite3_stmt    *s, *s2;
 117         struct match    *mp;
 118         struct ohash_info info;
 119         struct ohash     htab;
 120         unsigned int     idx;
 121         size_t           i, j, cur, maxres;
 122
 123         memset(&info, 0, sizeof(struct ohash_info));
 124
 125         info.halloc = hash_halloc;
 126         info.alloc = hash_alloc;
 127         info.hfree = hash_free;
 128         info.key_offset = offsetof(struct match, id);
 129
 130         *sz = cur = maxres = 0;
 131         sql = NULL;
 132         *res = NULL;
 133         fd = -1;
 134         e = NULL;
 135         rc = 0;
 136
 137         if (0 == argc)
 138                 goto out;
 139         if (NULL == (e = exprcomp(search, argc, argv)))
 140                 goto out;
 141
 142         outbit = 0;
 143         if (NULL != outkey) {
 144                 for (indexbit = 0, iterbit = 1;
 145                      indexbit < mansearch_keymax;
 146                      indexbit++, iterbit <<= 1) {
 147                         if (0 == strcasecmp(outkey,
 148                             mansearch_keynames[indexbit])) {
 149                                 outbit = iterbit;
 150                                 break;
 151                         }
 152                 }
 153         }
 154
 155         /*
 156          * Save a descriptor to the current working directory.
 157          * Since pathnames in the "paths" variable might be relative,
 158          * and we'll be chdir()ing into them, we need to keep a handle
 159          * on our current directory from which to start the chdir().
 160          */
 161
 162         if (NULL == getcwd(buf, PATH_MAX)) {
 163                 perror(NULL);
 164                 goto out;
 165         } else if (-1 == (fd = open(buf, O_RDONLY, 0))) {
 166                 perror(buf);
 167                 goto out;
 168         }
 169
 170         sql = sql_statement(e);
 171
 172         /*
 173          * Loop over the directories (containing databases) for us to
 174          * search.
 175          * Don't let missing/bad databases/directories phase us.
 176          * In each, try to open the resident database and, if it opens,
 177          * scan it for our match expression.
 178          */
 179
 180         for (i = 0; i < paths->sz; i++) {
 181                 if (-1 == fchdir(fd)) {
 182                         perror(buf);
 183                         free(*res);
 184                         break;
 185                 } else if (-1 == chdir(paths->paths[i])) {
 186                         perror(paths->paths[i]);
 187                         continue;
 188                 }
 189
 190                 c =  sqlite3_open_v2
 191                         (MANDOC_DB, &db,
 192                          SQLITE_OPEN_READONLY, NULL);
 193
 194                 if (SQLITE_OK != c) {
 195                         perror(MANDOC_DB);
 196                         sqlite3_close(db);
 197                         continue;
 198                 }
 199
 200                 /*
 201                  * Define the SQL functions for substring
 202                  * and regular expression matching.
 203                  */
 204
 205                 c = sqlite3_create_function(db, "match", 2,
 206                     SQLITE_ANY, NULL, sql_match, NULL, NULL);
 207                 assert(SQLITE_OK == c);
 208                 c = sqlite3_create_function(db, "regexp", 2,
 209                     SQLITE_ANY, NULL, sql_regexp, NULL, NULL);
 210                 assert(SQLITE_OK == c);
 211
 212                 j = 1;
 213                 c = sqlite3_prepare_v2(db, sql, -1, &s, NULL);
 214                 if (SQLITE_OK != c)
 215                         fprintf(stderr, "%s\n", sqlite3_errmsg(db));
 216
 217                 for (ep = e; NULL != ep; ep = ep->next) {
 218                         if (NULL == ep->substr) {
 219                                 SQL_BIND_BLOB(db, s, j, ep->regexp);
 220                         } else
 221                                 SQL_BIND_TEXT(db, s, j, ep->substr);
 222                         SQL_BIND_INT64(db, s, j, ep->bits);
 223                 }
 224
 225                 memset(&htab, 0, sizeof(struct ohash));
 226                 ohash_init(&htab, 4, &info);
 227
 228                 /*
 229                  * Hash each entry on its [unique] document identifier.
 230                  * This is a uint64_t.
 231                  * Instead of using a hash function, simply convert the
 232                  * uint64_t to a uint32_t, the hash value's type.
 233                  * This gives good performance and preserves the
 234                  * distribution of buckets in the table.
 235                  */
 236                 while (SQLITE_ROW == (c = sqlite3_step(s))) {
 237                         id = sqlite3_column_int64(s, 1);
 238                         idx = ohash_lookup_memory
 239                                 (&htab, (char *)&id,
 240                                  sizeof(uint64_t), (uint32_t)id);
 241
 242                         if (NULL != ohash_find(&htab, idx))
 243                                 continue;
 244
 245                         mp = mandoc_calloc(1, sizeof(struct match));
 246                         mp->id = id;
 247                         mp->form = sqlite3_column_int(s, 0);
 248                         ohash_insert(&htab, idx, mp);
 249                 }
 250
 251                 if (SQLITE_DONE != c)
 252                         fprintf(stderr, "%s\n", sqlite3_errmsg(db));
 253
 254                 sqlite3_finalize(s);
 255
 256                 c = sqlite3_prepare_v2(db,
 257                     "SELECT * FROM mlinks WHERE pageid=?",
 258                     -1, &s, NULL);
 259                 if (SQLITE_OK != c)
 260                         fprintf(stderr, "%s\n", sqlite3_errmsg(db));
 261
 262                 c = sqlite3_prepare_v2(db,
 263                     "SELECT * FROM keys WHERE pageid=? AND bits & ?",
 264                     -1, &s2, NULL);
 265                 if (SQLITE_OK != c)
 266                         fprintf(stderr, "%s\n", sqlite3_errmsg(db));
 267
 268                 for (mp = ohash_first(&htab, &idx);
 269                                 NULL != mp;
 270                                 mp = ohash_next(&htab, &idx)) {
 271                         if (cur + 1 > maxres) {
 272                                 maxres += 1024;
 273                                 *res = mandoc_realloc
 274                                         (*res, maxres * sizeof(struct manpage));
 275                         }
 276                         mpage = *res + cur;
 277                         mpage->form = mp->form;
 278                         buildnames(mpage, db, s, mp->id,
 279                             paths->paths[i], mp->form);
 280                         mpage->output = outbit ?
 281                             buildoutput(db, s2, mp->id, outbit) : NULL;
 282
 283                         free(mp);
 284                         cur++;
 285                 }
 286
 287                 sqlite3_finalize(s);
 288                 sqlite3_finalize(s2);
 289                 sqlite3_close(db);
 290                 ohash_delete(&htab);
 291         }
 292         rc = 1;
 293 out:
 294         exprfree(e);
 295         if (-1 != fd)
 296                 close(fd);
 297         free(sql);
 298         *sz = cur;
 299         return(rc);
 300 }
 301
 302 static void
 303 buildnames(struct manpage *mpage, sqlite3 *db, sqlite3_stmt *s,
 304                 uint64_t id, const char *path, int form)
 305 {
 306         char            *newnames;
 307         const char      *oldnames, *sep1, *name, *sec, *sep2, *arch, *fsec;
 308         size_t           i;
 309         int              c;
 310
 311         mpage->names = NULL;
 312         i = 1;
 313         SQL_BIND_INT64(db, s, i, id);
 314         while (SQLITE_ROW == (c = sqlite3_step(s))) {
 315
 316                 /* Assemble the list of names. */
 317
 318                 if (NULL == mpage->names) {
 319                         oldnames = "";
 320                         sep1 = "";
 321                 } else {
 322                         oldnames = mpage->names;
 323                         sep1 = ", ";
 324                 }
 325                 sec = sqlite3_column_text(s, 0);
 326                 arch = sqlite3_column_text(s, 1);
 327                 name = sqlite3_column_text(s, 2);
 328                 sep2 = '\0' == *arch ? "" : "/";
 329                 if (-1 == asprintf(&newnames, "%s%s%s(%s%s%s)",
 330                     oldnames, sep1, name, sec, sep2, arch)) {
 331                         perror(0);
 332                         exit((int)MANDOCLEVEL_SYSERR);
 333                 }
 334                 free(mpage->names);
 335                 mpage->names = newnames;
 336
 337                 /* Also save the first file name encountered. */
 338
 339                 if (NULL != mpage->file)
 340                         continue;
 341
 342                 if (form) {
 343                         sep1 = "man";
 344                         fsec = sec;
 345                 } else {
 346                         sep1 = "cat";
 347                         fsec = "0";
 348                 }
 349                 if (-1 == asprintf(&mpage->file, "%s/%s%s%s%s/%s.%s",
 350                     path, sep1, sec, sep2, arch, name, fsec)) {
 351                         perror(0);
 352                         exit((int)MANDOCLEVEL_SYSERR);
 353                 }
 354         }
 355         if (SQLITE_DONE != c)
 356                 fprintf(stderr, "%s\n", sqlite3_errmsg(db));
 357         sqlite3_reset(s);
 358 }
 359
 360 static char *
 361 buildoutput(sqlite3 *db, sqlite3_stmt *s, uint64_t id, uint64_t outbit)
 362 {
 363         char            *output, *newoutput;
 364         const char      *oldoutput, *sep1, *data;
 365         size_t           i;
 366         int              c;
 367
 368         output = NULL;
 369         i = 1;
 370         SQL_BIND_INT64(db, s, i, id);
 371         SQL_BIND_INT64(db, s, i, outbit);
 372         while (SQLITE_ROW == (c = sqlite3_step(s))) {
 373                 if (NULL == output) {
 374                         oldoutput = "";
 375                         sep1 = "";
 376                 } else {
 377                         oldoutput = output;
 378                         sep1 = " # ";
 379                 }
 380                 data = sqlite3_column_text(s, 1);
 381                 if (-1 == asprintf(&newoutput, "%s%s%s",
 382                     oldoutput, sep1, data)) {
 383                         perror(0);
 384                         exit((int)MANDOCLEVEL_SYSERR);
 385                 }
 386                 free(output);
 387                 output = newoutput;
 388         }
 389         if (SQLITE_DONE != c)
 390                 fprintf(stderr, "%s\n", sqlite3_errmsg(db));
 391         sqlite3_reset(s);
 392         return(output);
 393 }
 394
 395 /*
 396  * Implement substring match as an application-defined SQL function.
 397  * Using the SQL LIKE or GLOB operators instead would be a bad idea
 398  * because that would require escaping metacharacters in the string
 399  * being searched for.
 400  */
 401 static void
 402 sql_match(sqlite3_context *context, int argc, sqlite3_value **argv)
 403 {
 404
 405         assert(2 == argc);
 406         sqlite3_result_int(context, NULL != strcasestr(
 407             (const char *)sqlite3_value_text(argv[1]),
 408             (const char *)sqlite3_value_text(argv[0])));
 409 }
 410
 411 /*
 412  * Implement regular expression match
 413  * as an application-defined SQL function.
 414  */
 415 static void
 416 sql_regexp(sqlite3_context *context, int argc, sqlite3_value **argv)
 417 {
 418
 419         assert(2 == argc);
 420         sqlite3_result_int(context, !regexec(
 421             (regex_t *)sqlite3_value_blob(argv[0]),
 422             (const char *)sqlite3_value_text(argv[1]),
 423             0, NULL, 0));
 424 }
 425
 426 static void
 427 sql_append(char **sql, size_t *sz, const char *newstr, int count)
 428 {
 429         size_t           newsz;
 430
 431         newsz = 1 < count ? (size_t)count : strlen(newstr);
 432         *sql = mandoc_realloc(*sql, *sz + newsz + 1);
 433         if (1 < count)
 434                 memset(*sql + *sz, *newstr, (size_t)count);
 435         else
 436                 memcpy(*sql + *sz, newstr, newsz);
 437         *sz += newsz;
 438         (*sql)[*sz] = '\0';
 439 }
 440
 441 /*
 442  * Prepare the search SQL statement.
 443  */
 444 static char *
 445 sql_statement(const struct expr *e)
 446 {
 447         char            *sql;
 448         size_t           sz;
 449         int              needop;
 450
 451         sql = mandoc_strdup("SELECT * FROM mpages WHERE ");
 452         sz = strlen(sql);
 453
 454         for (needop = 0; NULL != e; e = e->next) {
 455                 if (e->and)
 456                         sql_append(&sql, &sz, " AND ", 1);
 457                 else if (needop)
 458                         sql_append(&sql, &sz, " OR ", 1);
 459                 if (e->open)
 460                         sql_append(&sql, &sz, "(", e->open);
 461                 sql_append(&sql, &sz, NULL == e->substr ?
 462                     "id IN (SELECT pageid FROM keys "
 463                     "WHERE key REGEXP ? AND bits & ?)" :
 464                     "id IN (SELECT pageid FROM keys "
 465                     "WHERE key MATCH ? AND bits & ?)", 1);
 466                 if (e->close)
 467                         sql_append(&sql, &sz, ")", e->close);
 468                 needop = 1;
 469         }
 470
 471         return(sql);
 472 }
 473
 474 /*
 475  * Compile a set of string tokens into an expression.
 476  * Tokens in "argv" are assumed to be individual expression atoms (e.g.,
 477  * "(", "foo=bar", etc.).
 478  */
 479 static struct expr *
 480 exprcomp(const struct mansearch *search, int argc, char *argv[])
 481 {
 482         int              i, toopen, logic, igncase, toclose;
 483         struct expr     *first, *next, *cur;
 484
 485         first = cur = NULL;
 486         logic = igncase = toclose = 0;
 487         toopen = 1;
 488
 489         for (i = 0; i < argc; i++) {
 490                 if (0 == strcmp("(", argv[i])) {
 491                         if (igncase)
 492                                 goto fail;
 493                         toopen++;
 494                         toclose++;
 495                         continue;
 496                 } else if (0 == strcmp(")", argv[i])) {
 497                         if (toopen || logic || igncase || NULL == cur)
 498                                 goto fail;
 499                         cur->close++;
 500                         if (0 > --toclose)
 501                                 goto fail;
 502                         continue;
 503                 } else if (0 == strcmp("-a", argv[i])) {
 504                         if (toopen || logic || igncase || NULL == cur)
 505                                 goto fail;
 506                         logic = 1;
 507                         continue;
 508                 } else if (0 == strcmp("-o", argv[i])) {
 509                         if (toopen || logic || igncase || NULL == cur)
 510                                 goto fail;
 511                         logic = 2;
 512                         continue;
 513                 } else if (0 == strcmp("-i", argv[i])) {
 514                         if (igncase)
 515                                 goto fail;
 516                         igncase = 1;
 517                         continue;
 518                 }
 519                 next = exprterm(search, argv[i], !igncase);
 520                 if (NULL == next)
 521                         goto fail;
 522                 next->open = toopen;
 523                 next->and = (1 == logic);
 524                 if (NULL != first) {
 525                         cur->next = next;
 526                         cur = next;
 527                 } else
 528                         cur = first = next;
 529                 toopen = logic = igncase = 0;
 530         }
 531         if (toopen || logic || igncase || toclose)
 532                 goto fail;
 533
 534         cur->close++;
 535         cur = exprspec(cur, TYPE_arch, search->arch, "^(%s|any)$");
 536         exprspec(cur, TYPE_sec, search->sec, "^%s$");
 537
 538         return(first);
 539
 540 fail:
 541         if (NULL != first)
 542                 exprfree(first);
 543         return(NULL);
 544 }
 545
 546 static struct expr *
 547 exprspec(struct expr *cur, uint64_t key, const char *value,
 548                 const char *format)
 549 {
 550         char     errbuf[BUFSIZ];
 551         char    *cp;
 552         int      irc;
 553
 554         if (NULL == value)
 555                 return(cur);
 556
 557         if (-1 == asprintf(&cp, format, value)) {
 558                 perror(0);
 559                 exit((int)MANDOCLEVEL_SYSERR);
 560         }
 561         cur->next = mandoc_calloc(1, sizeof(struct expr));
 562         cur = cur->next;
 563         cur->and = 1;
 564         cur->bits = key;
 565         if (0 != (irc = regcomp(&cur->regexp, cp,
 566             REG_EXTENDED | REG_NOSUB | REG_ICASE))) {
 567                 regerror(irc, &cur->regexp, errbuf, sizeof(errbuf));
 568                 fprintf(stderr, "regcomp: %s\n", errbuf);
 569                 cur->substr = value;
 570         }
 571         free(cp);
 572         return(cur);
 573 }
 574
 575 static struct expr *
 576 exprterm(const struct mansearch *search, char *buf, int cs)
 577 {
 578         char             errbuf[BUFSIZ];
 579         struct expr     *e;
 580         char            *key, *v;
 581         uint64_t         iterbit;
 582         int              i, irc;
 583
 584         if ('\0' == *buf)
 585                 return(NULL);
 586
 587         e = mandoc_calloc(1, sizeof(struct expr));
 588
 589         /*"whatis" mode uses an opaque string and default fields. */
 590
 591         if (MANSEARCH_WHATIS & search->flags) {
 592                 e->substr = buf;
 593                 e->bits = search->deftype;
 594                 return(e);
 595         }
 596
 597         /*
 598          * If no =~ is specified, search with equality over names and
 599          * descriptions.
 600          * If =~ begins the phrase, use name and description fields.
 601          */
 602
 603         if (NULL == (v = strpbrk(buf, "=~"))) {
 604                 e->substr = buf;
 605                 e->bits = search->deftype;
 606                 return(e);
 607         } else if (v == buf)
 608                 e->bits = search->deftype;
 609
 610         if ('~' == *v++) {
 611                 if (NULL != strstr(buf, "arch"))
 612                         cs = 0;
 613                 if (0 != (irc = regcomp(&e->regexp, v,
 614                     REG_EXTENDED | REG_NOSUB | (cs ? 0 : REG_ICASE)))) {
 615                         regerror(irc, &e->regexp, errbuf, sizeof(errbuf));
 616                         fprintf(stderr, "regcomp: %s\n", errbuf);
 617                         free(e);
 618                         return(NULL);
 619                 }
 620         } else
 621                 e->substr = v;
 622         v[-1] = '\0';
 623
 624         /*
 625          * Parse out all possible fields.
 626          * If the field doesn't resolve, bail.
 627          */
 628
 629         while (NULL != (key = strsep(&buf, ","))) {
 630                 if ('\0' == *key)
 631                         continue;
 632                 for (i = 0, iterbit = 1;
 633                      i < mansearch_keymax;
 634                      i++, iterbit <<= 1) {
 635                         if (0 == strcasecmp(key,
 636                             mansearch_keynames[i])) {
 637                                 e->bits |= iterbit;
 638                                 break;
 639                         }
 640                 }
 641                 if (i == mansearch_keymax) {
 642                         if (strcasecmp(key, "any")) {
 643                                 free(e);
 644                                 return(NULL);
 645                         }
 646                         e->bits |= ~0ULL;
 647                 }
 648         }
 649
 650         return(e);
 651 }
 652
 653 static void
 654 exprfree(struct expr *p)
 655 {
 656         struct expr     *pp;
 657
 658         while (NULL != p) {
 659                 pp = p->next;
 660                 free(p);
 661                 p = pp;
 662         }
 663 }
 664
 665 static void *
 666 hash_halloc(size_t sz, void *arg)
 667 {
 668
 669         return(mandoc_calloc(sz, 1));
 670 }
 671
 672 static void *
 673 hash_alloc(size_t sz, void *arg)
 674 {
 675
 676         return(mandoc_malloc(sz));
 677 }
 678
 679 static void
 680 hash_free(void *p, size_t sz, void *arg)
 681 {
 682
 683         free(p);
 684 }