mandoc(1): Update to 1.9.13.
[dragonfly.git] / usr.bin / mandoc / man_hash.c
CommitLineData
32c903ac 1/* $Id: man_hash.c,v 1.15 2009/09/23 11:53:45 kristaps Exp $ */
589e7c1d
SW
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 <sys/types.h>
18
19#include <assert.h>
20#include <limits.h>
21#include <stdlib.h>
22#include <string.h>
23
24#include "libman.h"
25
26static u_char table[26 * 6];
27
28/*
29 * XXX - this hash has global scope, so if intended for use as a library
30 * with multiple callers, it will need re-invocation protection.
31 */
32void
33man_hash_init(void)
34{
35 int i, j, x;
36
37 memset(table, UCHAR_MAX, sizeof(table));
38
39 for (i = 0; i < MAN_MAX; i++) {
40 x = man_macronames[i][0];
41 assert((x >= 65 && x <= 90) ||
42 (x >= 97 && x <= 122));
43
44 x -= (x <= 90) ? 65 : 97;
45 x *= 6;
46
47 for (j = 0; j < 6; j++)
48 if (UCHAR_MAX == table[x + j]) {
49 table[x + j] = (u_char)i;
50 break;
51 }
52 assert(j < 6);
53 }
54}
55
56int
57man_hash_find(const char *tmp)
58{
59 int x, i, tok;
60
61 if (0 == (x = tmp[0]))
62 return(MAN_MAX);
63 if ( ! ((x >= 65 && x <= 90) || (x >= 97 && x <= 122)))
64 return(MAN_MAX);
65
66 x -= (x <= 90) ? 65 : 97;
67 x *= 6;
68
69 for (i = 0; i < 6; i++) {
70 if (UCHAR_MAX == (tok = table[x + i]))
71 return(MAN_MAX);
72 if (0 == strcmp(tmp, man_macronames[tok]))
73 return(tok);
74 }
75
76 return(MAN_MAX);
77}