lib/libutil/opendisk.c

   1 /*      $NetBSD: opendisk.c,v 1.11 2009/09/08 21:34:57 pooka 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 1.11 2009/09/08 21:34:57 pooka 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, ...))
  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, 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, ...))
 101 {
 102
 103         return __opendisk(path, flags, buf, buflen, iscooked, ofn);
 104 }