1/*	$Id: mdoc_hash.c,v 1.18 2011/07/24 18:15:14 kristaps Exp $ */
2/*
3 * Copyright (c) 2008, 2009 Kristaps Dzonsons <kristaps@bsd.lv>
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#ifdef HAVE_CONFIG_H
18#include "config.h"
19#endif
20
21#include <sys/types.h>
22
23#include <assert.h>
24#include <ctype.h>
25#include <limits.h>
26#include <stdlib.h>
27#include <stdio.h>
28#include <string.h>
29
30#include "mdoc.h"
31#include "mandoc.h"
32#include "libmdoc.h"
33
34static	unsigned char	 table[27 * 12];
35
36/*
37 * XXX - this hash has global scope, so if intended for use as a library
38 * with multiple callers, it will need re-invocation protection.
39 */
40void
41mdoc_hash_init(void)
42{
43	int		 i, j, major;
44	const char	*p;
45
46	memset(table, UCHAR_MAX, sizeof(table));
47
48	for (i = 0; i < (int)MDOC_MAX; i++) {
49		p = mdoc_macronames[i];
50
51		if (isalpha((unsigned char)p[1]))
52			major = 12 * (tolower((unsigned char)p[1]) - 97);
53		else
54			major = 12 * 26;
55
56		for (j = 0; j < 12; j++)
57			if (UCHAR_MAX == table[major + j]) {
58				table[major + j] = (unsigned char)i;
59				break;
60			}
61
62		assert(j < 12);
63	}
64}
65
66enum mdoct
67mdoc_hash_find(const char *p)
68{
69	int		  major, i, j;
70
71	if (0 == p[0])
72		return(MDOC_MAX);
73	if ( ! isalpha((unsigned char)p[0]) && '%' != p[0])
74		return(MDOC_MAX);
75
76	if (isalpha((unsigned char)p[1]))
77		major = 12 * (tolower((unsigned char)p[1]) - 97);
78	else if ('1' == p[1])
79		major = 12 * 26;
80	else
81		return(MDOC_MAX);
82
83	if (p[2] && p[3])
84		return(MDOC_MAX);
85
86	for (j = 0; j < 12; j++) {
87		if (UCHAR_MAX == (i = table[major + j]))
88			break;
89		if (0 == strcmp(p, mdoc_macronames[i]))
90			return((enum mdoct)i);
91	}
92
93	return(MDOC_MAX);
94}
95