Add opendev(3) to libutil. Used by mt(1), soon by disklabel(8), maybe

others.  This is a generic version of the code used by mt(1).

1 files changed, 86 insertions, 0 deletions

diff --git a/lib/libutil/opendev.c b/lib/libutil/opendev.c
new file mode 100644
index 00000000000..66b50e08134
--- /dev/null
+++ b/lib/libutil/opendev.c
@@ -0,0 +1,86 @@
+/*	$OpenBSD: opendev.c,v 1.1 1996/06/17 06:35:34 downsj Exp $ */
+
+/*
+ * Copyright (c) 1996, Jason Downs.  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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``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(S) 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.
+ */
+
+#include <stdio.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <sys/disklabel.h>
+#include <paths.h>
+
+#include "opendev.h"
+
+/*
+ * This routine is a generic rewrite of the original code found in
+ * disklabel(8).
+ */
+
+int
+opendev(path, oflags, dflags, mode, realpath)
+	char *path;
+	int oflags;
+	int dflags;
+	mode_t mode;
+	char **realpath;
+{
+	int fd;
+	static char namebuf[256];
+
+	*realpath = path;
+
+	fd = open(path, oflags, mode);
+	if ((fd < 0) && (errno == ENOENT)) {
+		if (path[0] != '/') {
+			if (dflags & OPENDEV_PART) {
+				/*
+				 * First try raw partition (for removable
+				 * drives)
+				 */
+				(void)snprintf(namebuf, sizeof(namebuf),
+				    "%sr%s%c", _PATH_DEV, path, 'a' + RAW_PART);
+				fd = open(namebuf, oflags, mode);
+			}
+
+			if ((dflags & OPENDEV_DRCT) && (fd < 0) &&
+			    (errno == ENOENT)) {
+				/* ..and now no partition (for tapes) */
+				namebuf[strlen(namebuf) - 1] = '\0';
+				fd = open(namebuf, oflags, mode);
+			}
+
+			*realpath = namebuf;
+		}
+	}
+	if ((fd < 0) && (errno == ENOENT) && (path[0] != '/')) {
+		(void)snprintf(namebuf, sizeof(namebuf), "%sr%s",
+		    _PATH_DEV, path);
+		fd = open(namebuf, oflags, mode);
+
+		*realpath = namebuf;
+	}
+
+	return (fd);
+}