1 files changed, 95 insertions, 0 deletions
diff --git a/contrib/global/lib/gtagsopen.c b/contrib/global/lib/gtagsopen.c
new file mode 100644
index 0000000..2331c4b
--- /dev/null
+++ b/contrib/global/lib/gtagsopen.c
@@ -0,0 +1,95 @@
+/*
+ * 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;
+}