Annotation of mandoc/man_hash.c, Revision 1.20
1.20 ! kristaps 1: /* $Id: man_hash.c,v 1.19 2010/05/08 07:30:19 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>
1.17 kristaps 24: #include <ctype.h>
1.12 kristaps 25: #include <limits.h>
1.1 kristaps 26: #include <stdlib.h>
27: #include <string.h>
28:
29: #include "libman.h"
30:
1.17 kristaps 31: #define HASH_DEPTH 6
32:
33: #define HASH_ROW(x) do { \
1.20 ! kristaps 34: if (isupper((u_char)(x))) \
1.17 kristaps 35: (x) -= 65; \
36: else \
37: (x) -= 97; \
38: (x) *= HASH_DEPTH; \
39: } while (/* CONSTCOND */ 0)
40:
41: /*
42: * Lookup table is indexed first by lower-case first letter (plus one
43: * for the period, which is stored in the last row), then by lower or
44: * uppercase second letter. Buckets correspond to the index of the
45: * macro (the integer value of the enum stored as a char to save a bit
46: * of space).
47: */
1.20 ! kristaps 48: static u_char table[26 * HASH_DEPTH];
1.1 kristaps 49:
1.14 kristaps 50: /*
51: * XXX - this hash has global scope, so if intended for use as a library
52: * with multiple callers, it will need re-invocation protection.
53: */
1.12 kristaps 54: void
55: man_hash_init(void)
1.1 kristaps 56: {
1.5 kristaps 57: int i, j, x;
58:
1.12 kristaps 59: memset(table, UCHAR_MAX, sizeof(table));
1.5 kristaps 60:
1.18 kristaps 61: assert(/* LINTED */
62: MAN_MAX < UCHAR_MAX);
1.17 kristaps 63:
1.19 kristaps 64: for (i = 0; i < (int)MAN_MAX; i++) {
1.5 kristaps 65: x = man_macronames[i][0];
66:
1.20 ! kristaps 67: assert(isalpha((u_char)x));
1.5 kristaps 68:
1.17 kristaps 69: HASH_ROW(x);
70:
71: for (j = 0; j < HASH_DEPTH; j++)
1.12 kristaps 72: if (UCHAR_MAX == table[x + j]) {
1.13 kristaps 73: table[x + j] = (u_char)i;
1.5 kristaps 74: break;
75: }
1.17 kristaps 76:
77: assert(j < HASH_DEPTH);
1.5 kristaps 78: }
1.1 kristaps 79: }
80:
1.17 kristaps 81:
82: enum mant
1.12 kristaps 83: man_hash_find(const char *tmp)
1.1 kristaps 84: {
1.17 kristaps 85: int x, y, i;
86: enum mant tok;
1.2 kristaps 87:
1.17 kristaps 88: if ('\0' == (x = tmp[0]))
1.5 kristaps 89: return(MAN_MAX);
1.20 ! kristaps 90: if ( ! (isalpha((u_char)x)))
1.5 kristaps 91: return(MAN_MAX);
92:
1.17 kristaps 93: HASH_ROW(x);
1.5 kristaps 94:
1.17 kristaps 95: for (i = 0; i < HASH_DEPTH; i++) {
96: if (UCHAR_MAX == (y = table[x + i]))
1.5 kristaps 97: return(MAN_MAX);
1.17 kristaps 98:
99: tok = (enum mant)y;
1.5 kristaps 100: if (0 == strcmp(tmp, man_macronames[tok]))
101: return(tok);
102: }
1.1 kristaps 103:
104: return(MAN_MAX);
105: }
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