cache.c

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/*
 * Copyright (c) 2004, 2005 Tama Communications Corporation
 *
 * This file is part of GNU GLOBAL.
 *
 * GNU GLOBAL is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2, or (at your option)
 * any later version.
 *
 * GNU GLOBAL is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA.
 */
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <stdio.h>
#ifdef HAVE_STRING_H
#include <string.h>
#else
#include <strings.h>
#endif
#include <errno.h>
#include "global.h"
#include "assoc.h"
#include "htags.h"
#include "cache.h"

static ASSOC *assoc[GTAGLIM];
/*
 * Cache file is used for duplicate object entry.
 *
 * If function 'func()' is defined more than once then the cache record
 * of GTAGS has (1) the frequency and the name of duplicate object entry file,
 * else it has (2) the tag definition.
 * It can be distinguished the first character of the cache record.
 * If it is a blank then it is the former else the latter.
 *
 * (1) The frequency and the id of duplicate object entry file (=fid).
 *	+----------------------+
 *	|' '<fid>' '<frequency>|
 *	+----------------------+
 *    The duplicate object entry file can be referred to as 'D/<fid>.html'.
 *	
 * (2) The tag definition.
 *	+---------------------------+
 *	|<line number>' '<file name>|
 *	+---------------------------+
 *    The tag entry is referred to as 'S/<fid>.html#<line number>'.
 *    The <fid> can be calculated by path2fid(<file name>).
 */

/*
 * cache_open: open cache file.
 */
void
cache_open(void)
{
	assoc[GTAGS]  = assoc_open('d');
	assoc[GRTAGS] = assoc_open('r');
	if (symbol)
		assoc[GSYMS] = assoc_open('y');
}
/*
 * cache_put: put tag line.
 *
 *	i)	db	db type
 *	i)	tag	tag name
 *	i)	line	tag line
 */
void
cache_put(db, tag, line)
	int db;
	const char *tag;
	const char *line;
{
	if (db >= GTAGLIM)
		die("I don't know such tag file.");
	assoc_put(assoc[db], tag, line);
}
/*
 * cache_get: get tag line.
 *
 *	i)	db	db type
 *	i)	tag	tag name
 *	r)		tag line
 */
const char *
cache_get(db, tag)
	int db;
	const char *tag;
{
	if (db >= GTAGLIM)
		die("I don't know such tag file.");
	return assoc_get(assoc[db], tag);
}
/*
 * cache_close: close cache file.
 */
void
cache_close(void)
{
	int i;

	for (i = GTAGS; i < GTAGLIM; i++) {
		if (assoc[i]) {
			assoc_close(assoc[i]);
			assoc[i] = NULL;
		}
	}
}