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/* $Id: mdoc_hash.c,v 1.4 2009/07/26 01:08:13 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 <ctype.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include "libmdoc.h"
#define ADJUST_MAJOR(x) \
do if (37 == (x)) \
(x) = 0; /* % -> 00 */ \
else if (91 > (x)) \
(x) -= 64; /* A-Z -> 01 - 26 */ \
else \
(x) -= 70; /* a-z -> 27 - 52 */ \
while (/*CONSTCOND*/0)
#define ADJUST_MINOR(y) \
do if (49 == (y)) \
(y) = 0; /* 1 -> 00 */ \
else if (91 > (y)) \
(y) -= 65; /* A-Z -> 00 - 25 */ \
else \
(y) -= 97; /* a-z -> 00 - 25 */ \
while (/*CONSTCOND*/0)
#define INDEX(maj, min) \
((maj) * 26 * 3) + ((min) * 3)
#define SLOTCMP(slot, val) \
(mdoc_macronames[(slot)][0] == (val)[0] && \
mdoc_macronames[(slot)][1] == (val)[1] && \
(0 == (val)[2] || \
mdoc_macronames[(slot)][2] == (val)[2]))
void
mdoc_hash_free(void *htab)
{
free(htab);
}
void *
mdoc_hash_alloc(void)
{
int i, major, minor, ind;
const void **htab;
htab = calloc(26 * 3 * 52, sizeof(struct mdoc_macro *));
if (NULL == htab)
return(NULL);
for (i = 0; i < MDOC_MAX; i++) {
major = mdoc_macronames[i][0];
assert(isalpha((u_char)major) || 37 == major);
ADJUST_MAJOR(major);
minor = mdoc_macronames[i][1];
assert(isalpha((u_char)minor) || 49 == minor);
ADJUST_MINOR(minor);
ind = INDEX(major, minor);
if (NULL == htab[ind]) {
htab[ind] = &mdoc_macros[i];
continue;
}
if (NULL == htab[++ind]) {
htab[ind] = &mdoc_macros[i];
continue;
}
assert(NULL == htab[++ind]);
htab[ind] = &mdoc_macros[i];
}
return((void *)htab);
}
int
mdoc_hash_find(const void *arg, const char *tmp)
{
int major, minor, ind, slot;
const void **htab;
htab = /* LINTED */
(const void **)arg;
if (0 == (major = tmp[0]))
return(MDOC_MAX);
if (0 == (minor = tmp[1]))
return(MDOC_MAX);
if (tmp[2] && tmp[3])
return(MDOC_MAX);
if (37 != major && ! isalpha((u_char)major))
return(MDOC_MAX);
if (49 != minor && ! isalpha((u_char)minor))
return(MDOC_MAX);
ADJUST_MAJOR(major);
ADJUST_MINOR(minor);
ind = INDEX(major, minor);
if (ind < 0 || ind >= 26 * 3 * 52)
return(MDOC_MAX);
if (htab[ind]) {
slot = htab[ind] - /* LINTED */
(void *)mdoc_macros;
assert(0 == (size_t)slot % sizeof(struct mdoc_macro));
slot /= sizeof(struct mdoc_macro);
if (SLOTCMP(slot, tmp))
return(slot);
ind++;
}
if (htab[ind]) {
slot = htab[ind] - /* LINTED */
(void *)mdoc_macros;
assert(0 == (size_t)slot % sizeof(struct mdoc_macro));
slot /= sizeof(struct mdoc_macro);
if (SLOTCMP(slot, tmp))
return(slot);
ind++;
}
if (NULL == htab[ind])
return(MDOC_MAX);
slot = htab[ind] - /* LINTED */
(void *)mdoc_macros;
assert(0 == (size_t)slot % sizeof(struct mdoc_macro));
slot /= sizeof(struct mdoc_macro);
if (SLOTCMP(slot, tmp))
return(slot);
return(MDOC_MAX);
}
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