/*      $NetBSD: opendisk.c,v 1.14 2016/06/06 17:50:19 christos Exp $   */

/*-
* Copyright (c) 1997 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Luke Mewburn.
*
* 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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 HAVE_NBTOOL_CONFIG_H
#include "nbtool_config.h"
#endif

#include <sys/cdefs.h>
#if defined(LIBC_SCCS) && !defined(lint)
__RCSID("$NetBSD: opendisk.c,v 1.14 2016/06/06 17:50:19 christos Exp $");
#endif

#include <sys/param.h>

#include <assert.h>
#include <errno.h>
#include <stdarg.h>
#include <fcntl.h>
#ifndef HAVE_NBTOOL_CONFIG_H
#include <util.h>
#include <paths.h>
#else
#include "opendisk.h"
#endif
#include <stdio.h>
#include <string.h>

static int __printflike(5, 6)
opd(char *buf, size_t len, int (*ofn)(const char *, int, ...),
   int flags, const char *fmt, ...)
{
       va_list ap;

       va_start(ap, fmt);
       vsnprintf(buf, len, fmt, ap);
       va_end(ap);

       return (*ofn)(buf, flags, 0);
}

static int
__opendisk(const char *path, int flags, char *buf, size_t buflen, int iscooked,
       int (*ofn)(const char *, int, ...))
{
       int f, part;

       if (buf == NULL) {
               errno = EFAULT;
               return -1;
       }

       if ((flags & O_CREAT) != 0) {
               errno = EINVAL;
               return -1;
       }

       part = getrawpartition();
       if (part < 0)
               return -1;      /* sysctl(3) in getrawpartition sets errno */
       part += 'a';

       /*
        * If we are passed a plain name, first try /dev to avoid accidents
        * with files in the same directory that happen to match disk names.
        */
       if (strchr(path, '/') == NULL) {
               const char *r = iscooked ? "" : "r";
               const char *d = _PATH_DEV;

               f = opd(buf, buflen, ofn, flags, "%s%s%s", d, r, path);
               if (f != -1 || errno != ENOENT)
                       return f;

               f = opd(buf, buflen, ofn, flags, "%s%s%s%c", d, r, path, part);
               if (f != -1 || errno != ENOENT)
                       return f;
       }

       f = opd(buf, buflen, ofn, flags, "%s", path);
       if (f != -1 || errno != ENOENT)
               return f;

       return opd(buf, buflen, ofn, flags, "%s%c", path, part);
}

int
opendisk(const char *path, int flags, char *buf, size_t buflen, int iscooked)
{

       return __opendisk(path, flags, buf, buflen, iscooked, open);
}

int
opendisk1(const char *path, int flags, char *buf, size_t buflen, int iscooked,
       int (*ofn)(const char *, int, ...))
{

       return __opendisk(path, flags, buf, buflen, iscooked, ofn);
}