lib/libutil/opendisk.c

   1 /*      $NetBSD: opendisk.c,v 1.13 2014/09/29 21:04:52 christos 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 #if HAVE_NBTOOL_CONFIG_H
  33 #include "nbtool_config.h"
  34 #endif
  35
  36 #include <sys/cdefs.h>
  37 #if defined(LIBC_SCCS) && !defined(lint)
  38 __RCSID("$NetBSD: opendisk.c,v 1.13 2014/09/29 21:04:52 christos Exp $");
  39 #endif
  40
  41 #include <sys/param.h>
  42
  43 #include <assert.h>
  44 #include <errno.h>
  45 #include <fcntl.h>
  46 #ifndef HAVE_NBTOOL_CONFIG_H
  47 #include <util.h>
  48 #include <paths.h>
  49 #else
  50 #include "opendisk.h"
  51 #endif
  52 #include <stdio.h>
  53 #include <string.h>
  54
  55 static int
  56 __opendisk(const char *path, int flags, char *buf, size_t buflen, int iscooked,
  57         int (*ofn)(const char *, int, ...))
  58 {
  59 #if !defined(__minix)
  60         int f, rawpart;
  61 #else
  62         int f;
  63 #endif /* !defined(__minix) */
  64
  65 #if defined(__minix)
  66         /*
  67          * MINIX does not have the cooked/raw distinction.  Do not prepend 'r'
  68          * to the device name when generating a full path.
  69          */
  70         iscooked = 1;
  71 #endif /* defined(__minix) */
  72
  73         if (buf == NULL) {
  74                 errno = EFAULT;
  75                 return (-1);
  76         }
  77         snprintf(buf, buflen, "%s", path);
  78
  79         if ((flags & O_CREAT) != 0) {
  80                 errno = EINVAL;
  81                 return (-1);
  82         }
  83
  84 #if !defined(__minix)
  85         rawpart = getrawpartition();
  86         if (rawpart < 0)
  87                 return (-1);    /* sysctl(3) in getrawpartition sets errno */
  88 #endif /* !defined(__minix) */
  89
  90         f = ofn(buf, flags, 0);
  91         if (f != -1 || errno != ENOENT)
  92                 return (f);
  93
  94 #if !defined(__minix)
  95         snprintf(buf, buflen, "%s%c", path, 'a' + rawpart);
  96         f = ofn(buf, flags, 0);
  97         if (f != -1 || errno != ENOENT)
  98                 return (f);
  99 #endif /* !defined(__minix) */
 100
 101         if (strchr(path, '/') != NULL)
 102                 return (-1);
 103
 104         snprintf(buf, buflen, "%s%s%s", _PATH_DEV, iscooked ? "" : "r", path);
 105         f = ofn(buf, flags, 0);
 106         if (f != -1 || errno != ENOENT)
 107                 return (f);
 108
 109 #if !defined(__minix)
 110         snprintf(buf, buflen, "%s%s%s%c", _PATH_DEV, iscooked ? "" : "r", path,
 111             'a' + rawpart);
 112         f = ofn(buf, flags, 0);
 113 #endif /* !defined(__minix) */
 114         return (f);
 115 }
 116
 117 int
 118 opendisk(const char *path, int flags, char *buf, size_t buflen, int iscooked)
 119 {
 120
 121         return __opendisk(path, flags, buf, buflen, iscooked, open);
 122 }
 123
 124 int
 125 opendisk1(const char *path, int flags, char *buf, size_t buflen, int iscooked,
 126         int (*ofn)(const char *, int, ...))
 127 {
 128
 129         return __opendisk(path, flags, buf, buflen, iscooked, ofn);
 130 }