Annotation of mandoc/man_hash.c, Revision 1.14
1.14 ! kristaps 1: /* $Id: man_hash.c,v 1.13 2009/09/16 20:49:06 kristaps Exp $ */
1.1 kristaps 2: /*
1.8 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
1.7 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: *
1.7 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: */
1.5 kristaps 17: #include <assert.h>
1.12 kristaps 18: #include <limits.h>
1.1 kristaps 19: #include <stdlib.h>
20: #include <string.h>
21:
22: #include "libman.h"
23:
1.13 kristaps 24: static u_char table[26 * 6];
1.1 kristaps 25:
1.14 ! kristaps 26: /*
! 27: * XXX - this hash has global scope, so if intended for use as a library
! 28: * with multiple callers, it will need re-invocation protection.
! 29: */
1.12 kristaps 30: void
31: man_hash_init(void)
1.1 kristaps 32: {
1.5 kristaps 33: int i, j, x;
34:
1.12 kristaps 35: memset(table, UCHAR_MAX, sizeof(table));
1.5 kristaps 36:
1.9 kristaps 37: for (i = 0; i < MAN_MAX; i++) {
1.5 kristaps 38: x = man_macronames[i][0];
39: assert((x >= 65 && x <= 90) ||
40: (x >= 97 && x <= 122));
41:
42: x -= (x <= 90) ? 65 : 97;
1.11 kristaps 43: x *= 6;
1.5 kristaps 44:
1.11 kristaps 45: for (j = 0; j < 6; j++)
1.12 kristaps 46: if (UCHAR_MAX == table[x + j]) {
1.13 kristaps 47: table[x + j] = (u_char)i;
1.5 kristaps 48: break;
49: }
1.11 kristaps 50: assert(j < 6);
1.5 kristaps 51: }
1.1 kristaps 52: }
53:
54: int
1.12 kristaps 55: man_hash_find(const char *tmp)
1.1 kristaps 56: {
1.5 kristaps 57: int x, i, tok;
1.2 kristaps 58:
1.5 kristaps 59: if (0 == (x = tmp[0]))
60: return(MAN_MAX);
61: if ( ! ((x >= 65 && x <= 90) || (x >= 97 && x <= 122)))
62: return(MAN_MAX);
63:
64: x -= (x <= 90) ? 65 : 97;
1.11 kristaps 65: x *= 6;
1.5 kristaps 66:
1.11 kristaps 67: for (i = 0; i < 6; i++) {
1.12 kristaps 68: if (UCHAR_MAX == (tok = table[x + i]))
1.5 kristaps 69: return(MAN_MAX);
70: if (0 == strcmp(tmp, man_macronames[tok]))
71: return(tok);
72: }
1.1 kristaps 73:
74: return(MAN_MAX);
75: }
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