initial import of NetBSD tree

1 files changed, 86 insertions, 0 deletions

diff --git a/lib/libc/gen/devname.c b/lib/libc/gen/devname.c
new file mode 100644
index 00000000000..1a1c210cbe1
--- /dev/null
+++ b/lib/libc/gen/devname.c
@@ -0,0 +1,86 @@
+/*	$NetBSD: devname.c,v 1.4 1995/02/25 08:51:08 cgd Exp $	*/
+
+/*
+ * Copyright (c) 1989, 1993
+ *	The Regents of the University of California.  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 the University of
+ *	California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
+ */
+
+#if defined(LIBC_SCCS) && !defined(lint)
+#if 0
+static char sccsid[] = "@(#)devname.c	8.1 (Berkeley) 6/4/93";
+#else
+static char rcsid[] = "$NetBSD: devname.c,v 1.4 1995/02/25 08:51:08 cgd Exp $";
+#endif
+#endif /* LIBC_SCCS and not lint */
+
+#include <sys/types.h>
+
+#include <db.h>
+#include <err.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <paths.h>
+#include <stdio.h>
+#include <string.h>
+
+char *
+devname(dev, type)
+	dev_t dev;
+	mode_t type;
+{
+	struct {
+		mode_t type;
+		dev_t dev;
+	} bkey;
+	static DB *db;
+	static int failure;
+	DBT data, key;
+
+	if (!db && !failure &&
+	    !(db = dbopen(_PATH_DEVDB, O_RDONLY, 0, DB_HASH, NULL))) {
+		_warn("warning: %s", _PATH_DEVDB);
+		failure = 1;
+	}
+	if (failure)
+		return ("??");
+
+	/*
+	 * Keys are a mode_t followed by a dev_t.  The former is the type of
+	 * the file (mode & S_IFMT), the latter is the st_rdev field.  Be
+	 * sure to clear any padding that may be found in bkey.
+	 */
+	memset(&bkey, 0, sizeof(bkey));
+	bkey.dev = dev;
+	bkey.type = type;
+	key.data = &bkey;
+	key.size = sizeof(bkey);
+	return ((db->get)(db, &key, &data, 0) ? "??" : (char *)data.data);
+}