lib/libutil/getdiskrawname.c

   1 /*      $NetBSD: getdiskrawname.c,v 1.1 2012/04/07 16:44:39 christos Exp $      */
   2
   3 /*-
   4  * Copyright (c) 2012 The NetBSD Foundation, Inc.
   5  * All rights reserved.
   6  *
   7  * This code is derived from software contributed to The NetBSD Foundation
   8  * by Christos Zoulas.
   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 #include <sys/cdefs.h>
  32 __RCSID("$NetBSD: getdiskrawname.c,v 1.1 2012/04/07 16:44:39 christos Exp $");
  33
  34 #include <sys/stat.h>
  35
  36 #include <stdio.h>
  37 #include <string.h>
  38 #include <errno.h>
  39 #include <util.h>
  40
  41 const char *
  42 getdiskrawname(char *buf, size_t bufsiz, const char *name)
  43 {
  44         const char *dp = strrchr(name, '/');
  45         struct stat st;
  46
  47         if (dp == NULL) {
  48                 errno = EINVAL;
  49                 return NULL;
  50         }
  51
  52         if (stat(name, &st) == -1)
  53                 return NULL;
  54
  55         if (!S_ISBLK(st.st_mode)) {
  56                 errno = EFTYPE;
  57                 return NULL;
  58         }
  59
  60         (void)snprintf(buf, bufsiz, "%.*s/r%s", (int)(dp - name), name, dp + 1);
  61
  62         return buf;
  63 }
  64
  65 const char *
  66 getdiskcookedname(char *buf, size_t bufsiz, const char *name)
  67 {
  68         const char *dp;
  69         struct stat st;
  70
  71         if ((dp = strrchr(name, '/')) == NULL) {
  72                 errno = EINVAL;
  73                 return NULL;
  74         }
  75         if (stat(name, &st) == -1)
  76                 return NULL;
  77
  78         if (!S_ISCHR(st.st_mode)) {
  79                 errno = EFTYPE;
  80                 return NULL;
  81         }
  82         if (dp[1] != 'r') {
  83                 errno = EINVAL;
  84                 return NULL;
  85         }
  86         (void)snprintf(buf, bufsiz, "%.*s/%s", (int)(dp - name), name, dp + 2);
  87
  88         return buf;
  89 }