File: [cvsweb.bsd.lv] / mandoc / Attic / man_hash.c (download)
Revision 1.36, Mon Apr 24 23:06:18 2017 UTC (7 years, 2 months ago) by schwarze
Branch: MAIN
Changes since 1.35: +7 -9 lines
Continue parser unification:
* Make enum rofft an internal interface as enum roff_tok in "roff.h".
* Represent mdoc and man macros in enum roff_tok.
* Make TOKEN_NONE a proper enum value and use it throughout.
* Put the prologue macros first in the macro tables.
* Unify mdoc_macroname[] and man_macroname[] into roff_name[].
|
/* $Id: man_hash.c,v 1.36 2017/04/24 23:06:18 schwarze Exp $ */
/*
* Copyright (c) 2008, 2009, 2010 Kristaps Dzonsons <kristaps@bsd.lv>
* Copyright (c) 2015, 2017 Ingo Schwarze <schwarze@openbsd.org>
*
* 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.
*/
#include "config.h"
#include <sys/types.h>
#include <assert.h>
#include <ctype.h>
#include <limits.h>
#include <string.h>
#include "mandoc.h"
#include "roff.h"
#include "man.h"
#include "libmandoc.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];
void
man_hash_init(void)
{
int i, j, x;
if (*table != '\0')
return;
memset(table, UCHAR_MAX, sizeof(table));
for (i = 0; i < (int)(MAN_MAX - MAN_TH); i++) {
x = *roff_name[MAN_TH + i];
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 roff_tok
man_hash_find(const char *tmp)
{
int x, y, i;
if ('\0' == (x = tmp[0]))
return TOKEN_NONE;
if ( ! (isalpha((unsigned char)x)))
return TOKEN_NONE;
HASH_ROW(x);
for (i = 0; i < HASH_DEPTH; i++) {
if (UCHAR_MAX == (y = table[x + i]))
return TOKEN_NONE;
if (strcmp(tmp, roff_name[MAN_TH + y]) == 0)
return MAN_TH + y;
}
return TOKEN_NONE;
}