Annotation of mandoc/man_hash.c, Revision 1.16
1.16 ! kristaps 1: /* $Id: man_hash.c,v 1.15 2009/09/23 11:53:45 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: */
1.16 ! kristaps 17: #ifdef HAVE_CONFIG_H
! 18: #include "config.h"
! 19: #endif
! 20:
1.15 kristaps 21: #include <sys/types.h>
22:
1.5 kristaps 23: #include <assert.h>
1.12 kristaps 24: #include <limits.h>
1.1 kristaps 25: #include <stdlib.h>
26: #include <string.h>
27:
28: #include "libman.h"
29:
1.13 kristaps 30: static u_char table[26 * 6];
1.1 kristaps 31:
1.14 kristaps 32: /*
33: * XXX - this hash has global scope, so if intended for use as a library
34: * with multiple callers, it will need re-invocation protection.
35: */
1.12 kristaps 36: void
37: man_hash_init(void)
1.1 kristaps 38: {
1.5 kristaps 39: int i, j, x;
40:
1.12 kristaps 41: memset(table, UCHAR_MAX, sizeof(table));
1.5 kristaps 42:
1.9 kristaps 43: for (i = 0; i < MAN_MAX; i++) {
1.5 kristaps 44: x = man_macronames[i][0];
45: assert((x >= 65 && x <= 90) ||
46: (x >= 97 && x <= 122));
47:
48: x -= (x <= 90) ? 65 : 97;
1.11 kristaps 49: x *= 6;
1.5 kristaps 50:
1.11 kristaps 51: for (j = 0; j < 6; j++)
1.12 kristaps 52: if (UCHAR_MAX == table[x + j]) {
1.13 kristaps 53: table[x + j] = (u_char)i;
1.5 kristaps 54: break;
55: }
1.11 kristaps 56: assert(j < 6);
1.5 kristaps 57: }
1.1 kristaps 58: }
59:
60: int
1.12 kristaps 61: man_hash_find(const char *tmp)
1.1 kristaps 62: {
1.5 kristaps 63: int x, i, tok;
1.2 kristaps 64:
1.5 kristaps 65: if (0 == (x = tmp[0]))
66: return(MAN_MAX);
67: if ( ! ((x >= 65 && x <= 90) || (x >= 97 && x <= 122)))
68: return(MAN_MAX);
69:
70: x -= (x <= 90) ? 65 : 97;
1.11 kristaps 71: x *= 6;
1.5 kristaps 72:
1.11 kristaps 73: for (i = 0; i < 6; i++) {
1.12 kristaps 74: if (UCHAR_MAX == (tok = table[x + i]))
1.5 kristaps 75: return(MAN_MAX);
76: if (0 == strcmp(tmp, man_macronames[tok]))
77: return(tok);
78: }
1.1 kristaps 79:
80: return(MAN_MAX);
81: }
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