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/*
* Copyright (c) 1996, 1997 Shigio Yamaguchi. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Shigio Yamaguchi.
* 4. Neither the name of the author nor the names of any co-contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* gtagsopen.c 20-Oct-97
*
*/
#include <sys/param.h>
#include <fcntl.h>
#include <db.h>
#include "dbio.h"
#include "die.h"
#include "makepath.h"
#include "dbname.h"
#define VERSIONKEY " __.VERSION"
static int support_version = 1; /* accept this format version */
/*
* gtagsopen: open global database.
*
* i) dbpath dbpath directory
* i) db GTAGS, GRTAGS, GSYMS
* i) mode 0: read only
* 1: write only
* 2: read and write
* r) DB structure
*
* when error occurred, gtagopen doesn't return.
*/
DBIO *
gtagsopen(dbpath, db, mode)
char *dbpath;
int db;
int mode;
{
DBIO *dbio;
int version_number;
char *p;
/*
* allow duplicate records.
*/
dbio = db_open(makepath(dbpath, dbname(db)), mode, 0644, DBIO_DUP);
if (dbio == NULL) {
if (mode == 1)
die1("cannot make database (%s).", makepath(dbpath, dbname(db)));
die1("database not found (%s).", makepath(dbpath, dbname(db)));
}
if (mode == 1) {
/* nothing to do now */
} else {
/*
* recognize format version of GTAGS. 'format version record'
* is saved as a META record in GTAGS and GRTAGS.
* if 'format version record' is not found, it's assumed
* version 1.
*/
if (p = db_get(dbio, VERSIONKEY)) {
for (p += strlen(VERSIONKEY); *p && isspace(*p); p++)
;
version_number = atoi(p);
} else
version_number = 1;
if (version_number > support_version)
die("GTAGS seems new format. Please install the latest GLOBAL.");
}
return dbio;
}
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