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/* $Id: man_hash.c,v 1.7 2009/10/19 10:20:24 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 <sys/types.h>
#include <assert.h>
#include <limits.h>
#include <stdlib.h>
#include <string.h>
#include "libman.h"
static u_char table[26 * 6];
/*
* XXX - this hash has global scope, so if intended for use as a library
* with multiple callers, it will need re-invocation protection.
*/
void
man_hash_init(void)
{
int i, j, x;
memset(table, UCHAR_MAX, sizeof(table));
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 *= 6;
for (j = 0; j < 6; j++)
if (UCHAR_MAX == table[x + j]) {
table[x + j] = (u_char)i;
break;
}
assert(j < 6);
}
}
int
man_hash_find(const char *tmp)
{
int x, i, tok;
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 *= 6;
for (i = 0; i < 6; i++) {
if (UCHAR_MAX == (tok = table[x + i]))
return(MAN_MAX);
if (0 == strcmp(tmp, man_macronames[tok]))
return(tok);
}
return(MAN_MAX);
}
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