mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-25 11:37:56 +00:00
108 lines
2.5 KiB
C
108 lines
2.5 KiB
C
/* $Id: man_hash.c,v 1.25 2011/07/24 18:15:14 kristaps Exp $ */
|
|
/*
|
|
* Copyright (c) 2008, 2009, 2010 Kristaps Dzonsons <kristaps@bsd.lv>
|
|
*
|
|
* Permission to use, copy, modify, and distribute this software for any
|
|
* purpose with or without fee is hereby granted, provided that the above
|
|
* copyright notice and this permission notice appear in all copies.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
|
|
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
|
|
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
|
|
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
|
|
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
|
|
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
|
|
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
|
|
*/
|
|
#ifdef HAVE_CONFIG_H
|
|
#include "config.h"
|
|
#endif
|
|
|
|
#include <sys/types.h>
|
|
|
|
#include <assert.h>
|
|
#include <ctype.h>
|
|
#include <limits.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
|
|
#include "man.h"
|
|
#include "mandoc.h"
|
|
#include "libman.h"
|
|
|
|
#define HASH_DEPTH 6
|
|
|
|
#define HASH_ROW(x) do { \
|
|
if (isupper((unsigned char)(x))) \
|
|
(x) -= 65; \
|
|
else \
|
|
(x) -= 97; \
|
|
(x) *= HASH_DEPTH; \
|
|
} while (/* CONSTCOND */ 0)
|
|
|
|
/*
|
|
* Lookup table is indexed first by lower-case first letter (plus one
|
|
* for the period, which is stored in the last row), then by lower or
|
|
* uppercase second letter. Buckets correspond to the index of the
|
|
* macro (the integer value of the enum stored as a char to save a bit
|
|
* of space).
|
|
*/
|
|
static unsigned char table[26 * HASH_DEPTH];
|
|
|
|
/*
|
|
* XXX - this hash has global scope, so if intended for use as a library
|
|
* with multiple callers, it will need re-invocation protection.
|
|
*/
|
|
void
|
|
man_hash_init(void)
|
|
{
|
|
int i, j, x;
|
|
|
|
memset(table, UCHAR_MAX, sizeof(table));
|
|
|
|
assert(/* LINTED */
|
|
MAN_MAX < UCHAR_MAX);
|
|
|
|
for (i = 0; i < (int)MAN_MAX; i++) {
|
|
x = man_macronames[i][0];
|
|
|
|
assert(isalpha((unsigned char)x));
|
|
|
|
HASH_ROW(x);
|
|
|
|
for (j = 0; j < HASH_DEPTH; j++)
|
|
if (UCHAR_MAX == table[x + j]) {
|
|
table[x + j] = (unsigned char)i;
|
|
break;
|
|
}
|
|
|
|
assert(j < HASH_DEPTH);
|
|
}
|
|
}
|
|
|
|
|
|
enum mant
|
|
man_hash_find(const char *tmp)
|
|
{
|
|
int x, y, i;
|
|
enum mant tok;
|
|
|
|
if ('\0' == (x = tmp[0]))
|
|
return(MAN_MAX);
|
|
if ( ! (isalpha((unsigned char)x)))
|
|
return(MAN_MAX);
|
|
|
|
HASH_ROW(x);
|
|
|
|
for (i = 0; i < HASH_DEPTH; i++) {
|
|
if (UCHAR_MAX == (y = table[x + i]))
|
|
return(MAN_MAX);
|
|
|
|
tok = (enum mant)y;
|
|
if (0 == strcmp(tmp, man_macronames[tok]))
|
|
return(tok);
|
|
}
|
|
|
|
return(MAN_MAX);
|
|
}
|