1 /* $Id: mdoc_hash.c,v 1.21 2014/08/10 23:54:41 schwarze 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 #include "config.h"
18
19 #include <sys/types.h>
20
21 #include <assert.h>
22 #include <ctype.h>
23 #include <limits.h>
24 #include <stdlib.h>
25 #include <stdio.h>
26 #include <string.h>
27
28 #include "mdoc.h"
29 #include "libmdoc.h"
30
31 static unsigned char table[27 * 12];
32
33
34 /*
35 * XXX - this hash has global scope, so if intended for use as a library
36 * with multiple callers, it will need re-invocation protection.
37 */
38 void
mdoc_hash_init(void)39 mdoc_hash_init(void)
40 {
41 int i, j, major;
42 const char *p;
43
44 memset(table, UCHAR_MAX, sizeof(table));
45
46 for (i = 0; i < (int)MDOC_MAX; i++) {
47 p = mdoc_macronames[i];
48
49 if (isalpha((unsigned char)p[1]))
50 major = 12 * (tolower((unsigned char)p[1]) - 97);
51 else
52 major = 12 * 26;
53
54 for (j = 0; j < 12; j++)
55 if (UCHAR_MAX == table[major + j]) {
56 table[major + j] = (unsigned char)i;
57 break;
58 }
59
60 assert(j < 12);
61 }
62 }
63
64 enum mdoct
mdoc_hash_find(const char * p)65 mdoc_hash_find(const char *p)
66 {
67 int major, i, j;
68
69 if (0 == p[0])
70 return(MDOC_MAX);
71 if ( ! isalpha((unsigned char)p[0]) && '%' != p[0])
72 return(MDOC_MAX);
73
74 if (isalpha((unsigned char)p[1]))
75 major = 12 * (tolower((unsigned char)p[1]) - 97);
76 else if ('1' == p[1])
77 major = 12 * 26;
78 else
79 return(MDOC_MAX);
80
81 if (p[2] && p[3])
82 return(MDOC_MAX);
83
84 for (j = 0; j < 12; j++) {
85 if (UCHAR_MAX == (i = table[major + j]))
86 break;
87 if (0 == strcmp(p, mdoc_macronames[i]))
88 return((enum mdoct)i);
89 }
90
91 return(MDOC_MAX);
92 }
93