Annotation of mandoc/man_hash.c, Revision 1.29
1.29 ! schwarze 1: /* $Id: man_hash.c,v 1.28 2014/08/10 23:54:41 schwarze Exp $ */
1.1 kristaps 2: /*
1.23 schwarze 3: * Copyright (c) 2008, 2009, 2010 Kristaps Dzonsons <kristaps@bsd.lv>
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: #include "config.h"
18:
1.15 kristaps 19: #include <sys/types.h>
20:
1.5 kristaps 21: #include <assert.h>
1.17 kristaps 22: #include <ctype.h>
1.12 kristaps 23: #include <limits.h>
1.1 kristaps 24: #include <string.h>
25:
1.24 kristaps 26: #include "man.h"
1.1 kristaps 27: #include "libman.h"
28:
1.17 kristaps 29: #define HASH_DEPTH 6
30:
31: #define HASH_ROW(x) do { \
1.25 kristaps 32: if (isupper((unsigned char)(x))) \
1.17 kristaps 33: (x) -= 65; \
34: else \
35: (x) -= 97; \
36: (x) *= HASH_DEPTH; \
37: } while (/* CONSTCOND */ 0)
38:
39: /*
40: * Lookup table is indexed first by lower-case first letter (plus one
41: * for the period, which is stored in the last row), then by lower or
42: * uppercase second letter. Buckets correspond to the index of the
43: * macro (the integer value of the enum stored as a char to save a bit
44: * of space).
45: */
1.25 kristaps 46: static unsigned char table[26 * HASH_DEPTH];
1.1 kristaps 47:
1.27 schwarze 48:
1.14 kristaps 49: /*
50: * XXX - this hash has global scope, so if intended for use as a library
51: * with multiple callers, it will need re-invocation protection.
52: */
1.12 kristaps 53: void
54: man_hash_init(void)
1.1 kristaps 55: {
1.5 kristaps 56: int i, j, x;
57:
1.12 kristaps 58: memset(table, UCHAR_MAX, sizeof(table));
1.5 kristaps 59:
1.27 schwarze 60: assert(MAN_MAX < UCHAR_MAX);
1.17 kristaps 61:
1.19 kristaps 62: for (i = 0; i < (int)MAN_MAX; i++) {
1.5 kristaps 63: x = man_macronames[i][0];
64:
1.25 kristaps 65: assert(isalpha((unsigned char)x));
1.5 kristaps 66:
1.17 kristaps 67: HASH_ROW(x);
68:
69: for (j = 0; j < HASH_DEPTH; j++)
1.12 kristaps 70: if (UCHAR_MAX == table[x + j]) {
1.25 kristaps 71: table[x + j] = (unsigned char)i;
1.5 kristaps 72: break;
73: }
1.17 kristaps 74:
75: assert(j < HASH_DEPTH);
1.5 kristaps 76: }
1.1 kristaps 77: }
1.17 kristaps 78:
79: enum mant
1.12 kristaps 80: man_hash_find(const char *tmp)
1.1 kristaps 81: {
1.17 kristaps 82: int x, y, i;
83: enum mant tok;
1.2 kristaps 84:
1.17 kristaps 85: if ('\0' == (x = tmp[0]))
1.5 kristaps 86: return(MAN_MAX);
1.25 kristaps 87: if ( ! (isalpha((unsigned char)x)))
1.5 kristaps 88: return(MAN_MAX);
89:
1.17 kristaps 90: HASH_ROW(x);
1.5 kristaps 91:
1.17 kristaps 92: for (i = 0; i < HASH_DEPTH; i++) {
93: if (UCHAR_MAX == (y = table[x + i]))
1.5 kristaps 94: return(MAN_MAX);
1.17 kristaps 95:
96: tok = (enum mant)y;
1.5 kristaps 97: if (0 == strcmp(tmp, man_macronames[tok]))
98: return(tok);
99: }
1.1 kristaps 100:
101: return(MAN_MAX);
102: }
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