|
|
/* $OpenBSD: opendev.c,v 1.7 2002/06/09 22:18:43 fgsch Exp $ */
|
|
|
|
|
|
/*
|
|
|
* Copyright (c) 2000, Todd C. Miller. All rights reserved.
|
|
|
* 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 <errno.h>
|
|
|
#include <fcntl.h>
|
|
|
#include <limits.h>
|
|
|
#include <paths.h>
|
|
|
#include <stdio.h>
|
|
|
#include <string.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;
|
|
|
char *slash, *prefix;
|
|
|
static char namebuf[PATH_MAX];
|
|
|
|
|
|
/* Initial state */
|
|
|
if (realpath)
|
|
|
*realpath = path;
|
|
|
fd = -1;
|
|
|
errno = ENOENT;
|
|
|
|
|
|
if (dflags & OPENDEV_BLCK)
|
|
|
prefix = ""; /* block device */
|
|
|
else
|
|
|
prefix = "r"; /* character device */
|
|
|
|
|
|
if ((slash = strchr(path, '/')))
|
|
|
fd = open(path, oflags);
|
|
|
else if (dflags & OPENDEV_PART) {
|
|
|
/*
|
|
|
* First try raw partition (for removable drives)
|
|
|
*/
|
|
|
if (snprintf(namebuf, sizeof(namebuf), "%s%s%s%c",
|
|
|
_PATH_DEV, prefix, path, 'a' + getrawpartition())
|
|
|
< sizeof(namebuf)) {
|
|
|
fd = open(namebuf, oflags);
|
|
|
if (realpath)
|
|
|
*realpath = namebuf;
|
|
|
} else
|
|
|
errno = ENAMETOOLONG;
|
|
|
}
|
|
|
if (!slash && fd == -1 && errno == ENOENT) {
|
|
|
if (snprintf(namebuf, sizeof(namebuf), "%s%s%s",
|
|
|
_PATH_DEV, prefix, path) < sizeof(namebuf)) {
|
|
|
fd = open(namebuf, oflags);
|
|
|
if (realpath)
|
|
|
*realpath = namebuf;
|
|
|
} else
|
|
|
errno = ENAMETOOLONG;
|
|
|
}
|
|
|
return (fd);
|
|
|
}
|