1 /* $NetBSD: getdiskrawname.c,v 1.2 2013/12/22 14:31:51 mlelstv 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 1.2 2013/12/22 14:31:51 mlelstv 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 #include <unistd.h> 41 42 const char * 43 getdiskrawname(char *buf, size_t bufsiz, const char *name) 44 { 45 const char *dp = strrchr(name, '/'); 46 struct stat st; 47 ssize_t len; 48 49 if (dp == NULL) { 50 errno = EINVAL; 51 return NULL; 52 } 53 54 len = readlink(name, buf, bufsiz-1); 55 if (len > 0) { 56 buf[len] = '\0'; 57 name = buf; 58 } 59 60 if (stat(name, &st) == -1) 61 return NULL; 62 63 if (!S_ISBLK(st.st_mode)) { 64 errno = EFTYPE; 65 return NULL; 66 } 67 68 (void)snprintf(buf, bufsiz, "%.*s/r%s", (int)(dp - name), name, dp + 1); 69 70 return buf; 71 } 72 73 const char * 74 getdiskcookedname(char *buf, size_t bufsiz, const char *name) 75 { 76 const char *dp; 77 struct stat st; 78 ssize_t len; 79 80 if ((dp = strrchr(name, '/')) == NULL) { 81 errno = EINVAL; 82 return NULL; 83 } 84 85 len = readlink(name, buf, bufsiz-1); 86 if (len > 0) { 87 buf[len] = '\0'; 88 name = buf; 89 } 90 91 if (stat(name, &st) == -1) 92 return NULL; 93 94 if (!S_ISCHR(st.st_mode)) { 95 errno = EFTYPE; 96 return NULL; 97 } 98 99 if (dp[1] != 'r') { 100 errno = EINVAL; 101 return NULL; 102 } 103 104 (void)snprintf(buf, bufsiz, "%.*s/%s", (int)(dp - name), name, dp + 2); 105 106 return buf; 107 } 108