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/* $OpenBSD: opendev.c,v 1.4 1996/07/02 07:57:54 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 <paths.h>
#include "util.h"
/*
* This routine is a generic rewrite of the original code found in
* disklabel(8).
*/
int
opendev(path, oflags, dflags, realpath)
char *path;
int oflags;
int dflags;
char **realpath;
{
int fd;
static char namebuf[256];
if (realpath)
*realpath = path;
fd = open(path, oflags);
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' + getrawpartition());
fd = open(namebuf, oflags);
}
if ((dflags & OPENDEV_DRCT) && (fd < 0) &&
(errno == ENOENT)) {
/* ..and now no partition (for tapes) */
namebuf[strlen(namebuf) - 1] = '\0';
fd = open(namebuf, oflags);
}
if (realpath)
*realpath = namebuf;
}
}
if ((fd < 0) && (errno == ENOENT) && (path[0] != '/')) {
(void)snprintf(namebuf, sizeof(namebuf), "%sr%s",
_PATH_DEV, path);
fd = open(namebuf, oflags);
if (realpath)
*realpath = namebuf;
}
return (fd);
}
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