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opendisk.c revision 1.10.6.1 
      1 /*	$NetBSD: opendisk.c,v 1.10.6.1 2009/10/05 11:46:21 sborrill Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1997 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Luke Mewburn.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 #include <sys/cdefs.h>
     33 #if defined(LIBC_SCCS) && !defined(lint)
     34 __RCSID("$NetBSD: opendisk.c,v 1.10.6.1 2009/10/05 11:46:21 sborrill Exp $");
     35 #endif
     36 
     37 #include <sys/param.h>
     38 
     39 #include <assert.h>
     40 #include <errno.h>
     41 #include <fcntl.h>
     42 #include <util.h>
     43 #include <paths.h>
     44 #include <stdio.h>
     45 #include <string.h>
     46 
     47 static int
     48 __opendisk(const char *path, int flags, char *buf, size_t buflen, int iscooked,
     49 	int (*ofn)(const char *, int, mode_t))
     50 {
     51 	int f, rawpart;
     52 
     53 	if (buf == NULL) {
     54 		errno = EFAULT;
     55 		return (-1);
     56 	}
     57 	snprintf(buf, buflen, "%s", path);
     58 
     59 	if ((flags & O_CREAT) != 0) {
     60 		errno = EINVAL;
     61 		return (-1);
     62 	}
     63 
     64 	rawpart = getrawpartition();
     65 	if (rawpart < 0)
     66 		return (-1);	/* sysctl(3) in getrawpartition sets errno */
     67 
     68 	f = ofn(buf, flags, 0);
     69 	if (f != -1 || errno != ENOENT)
     70 		return (f);
     71 
     72 	snprintf(buf, buflen, "%s%c", path, 'a' + rawpart);
     73 	f = ofn(buf, flags, 0);
     74 	if (f != -1 || errno != ENOENT)
     75 		return (f);
     76 
     77 	if (strchr(path, '/') != NULL)
     78 		return (-1);
     79 
     80 	snprintf(buf, buflen, "%s%s%s", _PATH_DEV, iscooked ? "" : "r", path);
     81 	f = ofn(buf, flags, 0);
     82 	if (f != -1 || errno != ENOENT)
     83 		return (f);
     84 
     85 	snprintf(buf, buflen, "%s%s%s%c", _PATH_DEV, iscooked ? "" : "r", path,
     86 	    'a' + rawpart);
     87 	f = ofn(buf, flags, 0);
     88 	return (f);
     89 }
     90 
     91 int
     92 opendisk(const char *path, int flags, char *buf, size_t buflen, int iscooked)
     93 {
     94 
     95 	return __opendisk(path, flags, buf, buflen, iscooked, (void *)open);
     96 }
     97 
     98 int
     99 opendisk1(const char *path, int flags, char *buf, size_t buflen, int iscooked,
    100 	int (*ofn)(const char *, int, mode_t))
    101 {
    102 
    103 	return __opendisk(path, flags, buf, buflen, iscooked, ofn);
    104 }
    105