Annotation of mandoc/man_hash.c, Revision 1.36
1.36 ! schwarze 1: /* $Id: man_hash.c,v 1.35 2016/07/15 18:03:45 schwarze Exp $ */
1.1 kristaps 2: /*
1.23 schwarze 3: * Copyright (c) 2008, 2009, 2010 Kristaps Dzonsons <kristaps@bsd.lv>
1.36 ! schwarze 4: * Copyright (c) 2015, 2017 Ingo Schwarze <schwarze@openbsd.org>
1.1 kristaps 5: *
6: * Permission to use, copy, modify, and distribute this software for any
1.7 kristaps 7: * purpose with or without fee is hereby granted, provided that the above
8: * copyright notice and this permission notice appear in all copies.
1.1 kristaps 9: *
1.7 kristaps 10: * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11: * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12: * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13: * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14: * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
15: * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
16: * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
1.1 kristaps 17: */
1.16 kristaps 18: #include "config.h"
19:
1.15 kristaps 20: #include <sys/types.h>
21:
1.5 kristaps 22: #include <assert.h>
1.17 kristaps 23: #include <ctype.h>
1.12 kristaps 24: #include <limits.h>
1.1 kristaps 25: #include <string.h>
26:
1.35 schwarze 27: #include "mandoc.h"
1.30 schwarze 28: #include "roff.h"
1.24 kristaps 29: #include "man.h"
1.35 schwarze 30: #include "libmandoc.h"
1.1 kristaps 31: #include "libman.h"
32:
1.17 kristaps 33: #define HASH_DEPTH 6
34:
35: #define HASH_ROW(x) do { \
1.25 kristaps 36: if (isupper((unsigned char)(x))) \
1.17 kristaps 37: (x) -= 65; \
38: else \
39: (x) -= 97; \
40: (x) *= HASH_DEPTH; \
41: } while (/* CONSTCOND */ 0)
42:
43: /*
44: * Lookup table is indexed first by lower-case first letter (plus one
45: * for the period, which is stored in the last row), then by lower or
46: * uppercase second letter. Buckets correspond to the index of the
47: * macro (the integer value of the enum stored as a char to save a bit
48: * of space).
49: */
1.25 kristaps 50: static unsigned char table[26 * HASH_DEPTH];
1.1 kristaps 51:
1.27 schwarze 52:
1.12 kristaps 53: void
54: man_hash_init(void)
1.1 kristaps 55: {
1.5 kristaps 56: int i, j, x;
1.32 schwarze 57:
58: if (*table != '\0')
59: return;
1.5 kristaps 60:
1.12 kristaps 61: memset(table, UCHAR_MAX, sizeof(table));
1.5 kristaps 62:
1.36 ! schwarze 63: for (i = 0; i < (int)(MAN_MAX - MAN_TH); i++) {
! 64: x = *roff_name[MAN_TH + i];
1.5 kristaps 65:
1.25 kristaps 66: assert(isalpha((unsigned char)x));
1.5 kristaps 67:
1.17 kristaps 68: HASH_ROW(x);
69:
70: for (j = 0; j < HASH_DEPTH; j++)
1.12 kristaps 71: if (UCHAR_MAX == table[x + j]) {
1.25 kristaps 72: table[x + j] = (unsigned char)i;
1.5 kristaps 73: break;
74: }
1.17 kristaps 75:
76: assert(j < HASH_DEPTH);
1.5 kristaps 77: }
1.1 kristaps 78: }
1.17 kristaps 79:
1.36 ! schwarze 80: enum roff_tok
1.12 kristaps 81: man_hash_find(const char *tmp)
1.1 kristaps 82: {
1.17 kristaps 83: int x, y, i;
1.2 kristaps 84:
1.17 kristaps 85: if ('\0' == (x = tmp[0]))
1.34 schwarze 86: return TOKEN_NONE;
1.25 kristaps 87: if ( ! (isalpha((unsigned char)x)))
1.34 schwarze 88: return TOKEN_NONE;
1.5 kristaps 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]))
1.34 schwarze 94: return TOKEN_NONE;
1.17 kristaps 95:
1.36 ! schwarze 96: if (strcmp(tmp, roff_name[MAN_TH + y]) == 0)
! 97: return MAN_TH + y;
1.5 kristaps 98: }
1.1 kristaps 99:
1.34 schwarze 100: return TOKEN_NONE;
1.1 kristaps 101: }
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