Annotation of src/usr.bin/mandoc/man_hash.c, Revision 1.26
1.26 ! schwarze 1: /* $OpenBSD: man_hash.c,v 1.25 2016/07/15 18:02:32 schwarze Exp $ */
1.1 kristaps 2: /*
1.13 schwarze 3: * Copyright (c) 2008, 2009, 2010 Kristaps Dzonsons <kristaps@bsd.lv>
1.26 ! 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
1.2 schwarze 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: *
1.2 schwarze 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: */
1.7 schwarze 18: #include <sys/types.h>
19:
1.1 kristaps 20: #include <assert.h>
1.8 schwarze 21: #include <ctype.h>
1.6 schwarze 22: #include <limits.h>
1.1 kristaps 23: #include <string.h>
24:
1.25 schwarze 25: #include "mandoc.h"
1.20 schwarze 26: #include "roff.h"
1.14 schwarze 27: #include "man.h"
1.25 schwarze 28: #include "libmandoc.h"
1.1 kristaps 29: #include "libman.h"
30:
1.15 schwarze 31: #define HASH_DEPTH 6
1.8 schwarze 32:
33: #define HASH_ROW(x) do { \
1.15 schwarze 34: if (isupper((unsigned char)(x))) \
1.8 schwarze 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: */
1.15 schwarze 48: static unsigned char table[26 * HASH_DEPTH];
1.1 kristaps 49:
1.17 schwarze 50:
1.1 kristaps 51: void
1.6 schwarze 52: man_hash_init(void)
1.1 kristaps 53: {
54: int i, j, x;
1.22 schwarze 55:
56: if (*table != '\0')
57: return;
1.1 kristaps 58:
1.6 schwarze 59: memset(table, UCHAR_MAX, sizeof(table));
1.1 kristaps 60:
1.26 ! schwarze 61: for (i = 0; i < (int)(MAN_MAX - MAN_TH); i++) {
! 62: x = *roff_name[MAN_TH + i];
1.1 kristaps 63:
1.15 schwarze 64: assert(isalpha((unsigned char)x));
1.1 kristaps 65:
1.8 schwarze 66: HASH_ROW(x);
67:
68: for (j = 0; j < HASH_DEPTH; j++)
1.6 schwarze 69: if (UCHAR_MAX == table[x + j]) {
1.15 schwarze 70: table[x + j] = (unsigned char)i;
1.1 kristaps 71: break;
72: }
1.8 schwarze 73:
74: assert(j < HASH_DEPTH);
1.1 kristaps 75: }
76: }
1.8 schwarze 77:
1.26 ! schwarze 78: enum roff_tok
1.6 schwarze 79: man_hash_find(const char *tmp)
1.1 kristaps 80: {
1.8 schwarze 81: int x, y, i;
1.1 kristaps 82:
1.8 schwarze 83: if ('\0' == (x = tmp[0]))
1.24 schwarze 84: return TOKEN_NONE;
1.15 schwarze 85: if ( ! (isalpha((unsigned char)x)))
1.24 schwarze 86: return TOKEN_NONE;
1.1 kristaps 87:
1.8 schwarze 88: HASH_ROW(x);
1.1 kristaps 89:
1.8 schwarze 90: for (i = 0; i < HASH_DEPTH; i++) {
91: if (UCHAR_MAX == (y = table[x + i]))
1.24 schwarze 92: return TOKEN_NONE;
1.8 schwarze 93:
1.26 ! schwarze 94: if (strcmp(tmp, roff_name[MAN_TH + y]) == 0)
! 95: return MAN_TH + y;
1.1 kristaps 96: }
97:
1.24 schwarze 98: return TOKEN_NONE;
1.1 kristaps 99: }