Annotation of src/usr.bin/mandoc/mdoc_hash.c, Revision 1.14
1.14 ! schwarze 1: /* $Id: mdoc_hash.c,v 1.13 2011/09/18 15:54:48 schwarze Exp $ */
1.1 kristaps 2: /*
1.11 schwarze 3: * Copyright (c) 2008, 2009 Kristaps Dzonsons <kristaps@bsd.lv>
1.1 kristaps 4: *
5: * Permission to use, copy, modify, and distribute this software for any
1.2 schwarze 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: *
1.2 schwarze 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: */
1.5 schwarze 17: #include <sys/types.h>
18:
1.1 kristaps 19: #include <assert.h>
20: #include <ctype.h>
1.6 schwarze 21: #include <limits.h>
1.1 kristaps 22: #include <stdlib.h>
23: #include <stdio.h>
24: #include <string.h>
25:
1.12 schwarze 26: #include "mdoc.h"
1.1 kristaps 27: #include "libmdoc.h"
28:
1.13 schwarze 29: static unsigned char table[27 * 12];
1.1 kristaps 30:
1.6 schwarze 31: /*
32: * XXX - this hash has global scope, so if intended for use as a library
33: * with multiple callers, it will need re-invocation protection.
34: */
1.1 kristaps 35: void
1.6 schwarze 36: mdoc_hash_init(void)
1.1 kristaps 37: {
1.6 schwarze 38: int i, j, major;
39: const char *p;
1.1 kristaps 40:
1.6 schwarze 41: memset(table, UCHAR_MAX, sizeof(table));
1.1 kristaps 42:
1.9 schwarze 43: for (i = 0; i < (int)MDOC_MAX; i++) {
1.6 schwarze 44: p = mdoc_macronames[i];
1.1 kristaps 45:
1.13 schwarze 46: if (isalpha((unsigned char)p[1]))
47: major = 12 * (tolower((unsigned char)p[1]) - 97);
1.6 schwarze 48: else
1.13 schwarze 49: major = 12 * 26;
1.6 schwarze 50:
1.13 schwarze 51: for (j = 0; j < 12; j++)
1.6 schwarze 52: if (UCHAR_MAX == table[major + j]) {
1.13 schwarze 53: table[major + j] = (unsigned char)i;
1.6 schwarze 54: break;
55: }
1.1 kristaps 56:
1.13 schwarze 57: assert(j < 12);
1.1 kristaps 58: }
59: }
60:
1.8 schwarze 61: enum mdoct
1.6 schwarze 62: mdoc_hash_find(const char *p)
1.1 kristaps 63: {
1.6 schwarze 64: int major, i, j;
1.1 kristaps 65:
1.6 schwarze 66: if (0 == p[0])
1.1 kristaps 67: return(MDOC_MAX);
1.13 schwarze 68: if ( ! isalpha((unsigned char)p[0]) && '%' != p[0])
1.4 schwarze 69: return(MDOC_MAX);
70:
1.13 schwarze 71: if (isalpha((unsigned char)p[1]))
72: major = 12 * (tolower((unsigned char)p[1]) - 97);
1.6 schwarze 73: else if ('1' == p[1])
1.13 schwarze 74: major = 12 * 26;
1.6 schwarze 75: else
1.1 kristaps 76: return(MDOC_MAX);
77:
1.6 schwarze 78: if (p[2] && p[3])
1.1 kristaps 79: return(MDOC_MAX);
80:
1.13 schwarze 81: for (j = 0; j < 12; j++) {
1.6 schwarze 82: if (UCHAR_MAX == (i = table[major + j]))
83: break;
84: if (0 == strcmp(p, mdoc_macronames[i]))
1.8 schwarze 85: return((enum mdoct)i);
1.1 kristaps 86: }
87:
88: return(MDOC_MAX);
89: }