Annotation of mandoc/mdoc_hash.c, Revision 1.11
1.11 ! kristaps 1: /* $Id: mdoc_hash.c,v 1.10 2009/09/16 20:49:06 kristaps Exp $ */
1.1 kristaps 2: /*
1.4 kristaps 3: * Copyright (c) 2008, 2009 Kristaps Dzonsons <kristaps@kth.se>
1.1 kristaps 4: *
5: * Permission to use, copy, modify, and distribute this software for any
1.3 kristaps 6: * purpose with or without fee is hereby granted, provided that the above
7: * copyright notice and this permission notice appear in all copies.
1.1 kristaps 8: *
1.3 kristaps 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.
1.1 kristaps 16: */
1.8 kristaps 17: #include <sys/types.h>
18:
1.1 kristaps 19: #include <assert.h>
20: #include <ctype.h>
1.9 kristaps 21: #include <limits.h>
1.1 kristaps 22: #include <stdlib.h>
23: #include <stdio.h>
24: #include <string.h>
25:
26: #include "libmdoc.h"
27:
1.10 kristaps 28: static u_char table[27 * 12];
1.6 kristaps 29:
1.11 ! kristaps 30: /*
! 31: * XXX - this hash has global scope, so if intended for use as a library
! 32: * with multiple callers, it will need re-invocation protection.
! 33: */
1.1 kristaps 34: void
1.9 kristaps 35: mdoc_hash_init(void)
1.1 kristaps 36: {
1.9 kristaps 37: int i, j, major;
38: const char *p;
1.1 kristaps 39:
1.9 kristaps 40: memset(table, UCHAR_MAX, sizeof(table));
1.1 kristaps 41:
1.5 kristaps 42: for (i = 0; i < MDOC_MAX; i++) {
1.9 kristaps 43: p = mdoc_macronames[i];
1.1 kristaps 44:
1.9 kristaps 45: if (isalpha((u_char)p[1]))
46: major = 12 * (tolower((u_char)p[1]) - 97);
47: else
48: major = 12 * 26;
49:
50: for (j = 0; j < 12; j++)
51: if (UCHAR_MAX == table[major + j]) {
1.10 kristaps 52: table[major + j] = (u_char)i;
1.9 kristaps 53: break;
54: }
1.1 kristaps 55:
1.9 kristaps 56: assert(j < 12);
1.1 kristaps 57: }
58: }
59:
60: int
1.9 kristaps 61: mdoc_hash_find(const char *p)
1.1 kristaps 62: {
1.9 kristaps 63: int major, i, j;
1.1 kristaps 64:
1.9 kristaps 65: if (0 == p[0])
1.6 kristaps 66: return(MDOC_MAX);
1.9 kristaps 67: if ( ! isalpha((u_char)p[0]) && '%' != p[0])
1.1 kristaps 68: return(MDOC_MAX);
1.6 kristaps 69:
1.9 kristaps 70: if (isalpha((u_char)p[1]))
71: major = 12 * (tolower((u_char)p[1]) - 97);
72: else if ('1' == p[1])
73: major = 12 * 26;
74: else
1.1 kristaps 75: return(MDOC_MAX);
76:
1.9 kristaps 77: if (p[2] && p[3])
1.1 kristaps 78: return(MDOC_MAX);
79:
1.9 kristaps 80: for (j = 0; j < 12; j++) {
81: if (UCHAR_MAX == (i = table[major + j]))
82: break;
83: if (0 == strcmp(p, mdoc_macronames[i]))
84: return(i);
1.1 kristaps 85: }
86:
87: return(MDOC_MAX);
88: }
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