man_hash.c

   1 /*      $Id: man_hash.c,v 1.8 2009/06/10 20:18:43 kristaps Exp $ */
   2 /*
   3  * Copyright (c) 2008, 2009 Kristaps Dzonsons <kristaps@kth.se>
   4  *
   5  * Permission to use, copy, modify, and distribute this software for any
   6  * purpose with or without fee is hereby granted, provided that the above
   7  * copyright notice and this permission notice appear in all copies.
   8  *
   9  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  10  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  11  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  12  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  13  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  14  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  15  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  16  */
  17 #include <assert.h>
  18 #include <stdlib.h>
  19 #include <string.h>
  20
  21 #include "libman.h"
  22
  23
  24 /* ARGUSED */
  25 void
  26 man_hash_free(void *htab)
  27 {
  28
  29         free(htab);
  30 }
  31
  32
  33 /* ARGUSED */
  34 void *
  35 man_hash_alloc(void)
  36 {
  37         int             *htab;
  38         int              i, j, x;
  39
  40         htab = calloc(26 * 5, sizeof(int));
  41         if (NULL == htab)
  42                 return(NULL);
  43
  44         for (i = 1; i < MAN_MAX; i++) {
  45                 x = man_macronames[i][0];
  46
  47                 assert((x >= 65 && x <= 90) ||
  48                                 (x >= 97 && x <= 122));
  49
  50                 x -= (x <= 90) ? 65 : 97;
  51                 x *= 5;
  52
  53                 for (j = 0; j < 5; j++)
  54                         if (0 == htab[x + j]) {
  55                                 htab[x + j] = i;
  56                                 break;
  57                         }
  58
  59                 assert(j < 5);
  60         }
  61
  62         return((void *)htab);
  63 }
  64
  65
  66 int
  67 man_hash_find(const void *arg, const char *tmp)
  68 {
  69         int              x, i, tok;
  70         const int       *htab;
  71
  72         htab = (const int *)arg;
  73
  74         if (0 == (x = tmp[0]))
  75                 return(MAN_MAX);
  76         if ( ! ((x >= 65 && x <= 90) || (x >= 97 && x <= 122)))
  77                 return(MAN_MAX);
  78
  79         x -= (x <= 90) ? 65 : 97;
  80         x *= 5;
  81
  82         for (i = 0; i < 5; i++) {
  83                 if (0 == (tok = htab[x + i]))
  84                         return(MAN_MAX);
  85                 if (0 == strcmp(tmp, man_macronames[tok]))
  86                         return(tok);
  87         }
  88
  89         return(MAN_MAX);
  90 }
  91