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/* $Id: man_hash.c,v 1.4 2009/06/23 22:43:30 schwarze Exp $ */
/*
* Copyright (c) 2008, 2009 Kristaps Dzonsons <kristaps@kth.se>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <assert.h>
#include <stdlib.h>
#include <string.h>
#include "libman.h"
/* ARGUSED */
void
man_hash_free(void *htab)
{
free(htab);
}
/* ARGUSED */
void *
man_hash_alloc(void)
{
int *htab;
int i, j, x;
/* Initialised to -1. */
htab = malloc(26 * 5 * sizeof(int));
if (NULL == htab)
return(NULL);
for (i = 0; i < 26 * 5; i++)
htab[i] = -1;
for (i = 0; i < MAN_MAX; i++) {
x = man_macronames[i][0];
assert((x >= 65 && x <= 90) ||
(x >= 97 && x <= 122));
x -= (x <= 90) ? 65 : 97;
x *= 5;
for (j = 0; j < 5; j++)
if (-1 == htab[x + j]) {
htab[x + j] = i;
break;
}
assert(j < 5);
}
return((void *)htab);
}
int
man_hash_find(const void *arg, const char *tmp)
{
int x, i, tok;
const int *htab;
htab = (const int *)arg;
if (0 == (x = tmp[0]))
return(MAN_MAX);
if ( ! ((x >= 65 && x <= 90) || (x >= 97 && x <= 122)))
return(MAN_MAX);
x -= (x <= 90) ? 65 : 97;
x *= 5;
for (i = 0; i < 5; i++) {
if (-1 == (tok = htab[x + i]))
return(MAN_MAX);
if (0 == strcmp(tmp, man_macronames[tok]))
return(tok);
}
return(MAN_MAX);
}
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