1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
|
/* $OpenBSD: man_hash.c,v 1.23 2015/04/19 13:59:37 schwarze Exp $ */
/*
* Copyright (c) 2008, 2009, 2010 Kristaps Dzonsons <kristaps@bsd.lv>
*
* 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 <ctype.h>
#include <limits.h>
#include <string.h>
#include "roff.h"
#include "man.h"
#include "libman.h"
#define HASH_DEPTH 6
#define HASH_ROW(x) do { \
if (isupper((unsigned char)(x))) \
(x) -= 65; \
else \
(x) -= 97; \
(x) *= HASH_DEPTH; \
} while (/* CONSTCOND */ 0)
/*
* Lookup table is indexed first by lower-case first letter (plus one
* for the period, which is stored in the last row), then by lower or
* uppercase second letter. Buckets correspond to the index of the
* macro (the integer value of the enum stored as a char to save a bit
* of space).
*/
static unsigned char table[26 * HASH_DEPTH];
void
man_hash_init(void)
{
int i, j, x;
if (*table != '\0')
return;
memset(table, UCHAR_MAX, sizeof(table));
for (i = 0; i < (int)MAN_MAX; i++) {
x = man_macronames[i][0];
assert(isalpha((unsigned char)x));
HASH_ROW(x);
for (j = 0; j < HASH_DEPTH; j++)
if (UCHAR_MAX == table[x + j]) {
table[x + j] = (unsigned char)i;
break;
}
assert(j < HASH_DEPTH);
}
}
int
man_hash_find(const char *tmp)
{
int x, y, i;
int tok;
if ('\0' == (x = tmp[0]))
return(TOKEN_NONE);
if ( ! (isalpha((unsigned char)x)))
return(TOKEN_NONE);
HASH_ROW(x);
for (i = 0; i < HASH_DEPTH; i++) {
if (UCHAR_MAX == (y = table[x + i]))
return(TOKEN_NONE);
tok = y;
if (0 == strcmp(tmp, man_macronames[tok]))
return(tok);
}
return(TOKEN_NONE);
}
|
