89 lines
2.7 KiB
C
89 lines
2.7 KiB
C
/* $NetBSD: opendisk.c,v 1.10 2008/04/28 20:23:03 martin Exp $ */
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/*-
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* Copyright (c) 1997 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Luke Mewburn.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#if defined(LIBC_SCCS) && !defined(lint)
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__RCSID("$NetBSD: opendisk.c,v 1.10 2008/04/28 20:23:03 martin Exp $");
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#endif
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#include <sys/param.h>
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#include <assert.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <util.h>
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#include <paths.h>
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#include <stdio.h>
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#include <string.h>
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int
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opendisk(const char *path, int flags, char *buf, size_t buflen, int iscooked)
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{
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int f, rawpart;
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if (buf == NULL) {
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errno = EFAULT;
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return (-1);
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}
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snprintf(buf, buflen, "%s", path);
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if ((flags & O_CREAT) != 0) {
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errno = EINVAL;
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return (-1);
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}
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rawpart = getrawpartition();
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if (rawpart < 0)
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return (-1); /* sysctl(3) in getrawpartition sets errno */
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f = open(buf, flags);
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if (f != -1 || errno != ENOENT)
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return (f);
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snprintf(buf, buflen, "%s%c", path, 'a' + rawpart);
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f = open(buf, flags);
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if (f != -1 || errno != ENOENT)
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return (f);
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if (strchr(path, '/') != NULL)
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return (-1);
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snprintf(buf, buflen, "%s%s%s", _PATH_DEV, iscooked ? "" : "r", path);
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f = open(buf, flags);
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if (f != -1 || errno != ENOENT)
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return (f);
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snprintf(buf, buflen, "%s%s%s%c", _PATH_DEV, iscooked ? "" : "r", path,
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'a' + rawpart);
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f = open(buf, flags);
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return (f);
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}
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