1 /* $NetBSD: opendisk.c,v 1.14 2016/06/06 17:50:19 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 1.14 2016/06/06 17:50:19 christos Exp $"); 39 #endif 40 41 #include <sys/param.h> 42 43 #include <assert.h> 44 #include <errno.h> 45 #include <stdarg.h> 46 #include <fcntl.h> 47 #ifndef HAVE_NBTOOL_CONFIG_H 48 #include <util.h> 49 #include <paths.h> 50 #else 51 #include "opendisk.h" 52 #endif 53 #include <stdio.h> 54 #include <string.h> 55 56 static int __printflike(5, 6) 57 opd(char *buf, size_t len, int (*ofn)(const char *, int, ...), 58 int flags, const char *fmt, ...) 59 { 60 va_list ap; 61 62 va_start(ap, fmt); 63 vsnprintf(buf, len, fmt, ap); 64 va_end(ap); 65 66 return (*ofn)(buf, flags, 0); 67 } 68 69 static int 70 __opendisk(const char *path, int flags, char *buf, size_t buflen, int iscooked, 71 int (*ofn)(const char *, int, ...)) 72 { 73 int f, part; 74 75 if (buf == NULL) { 76 errno = EFAULT; 77 return -1; 78 } 79 80 if ((flags & O_CREAT) != 0) { 81 errno = EINVAL; 82 return -1; 83 } 84 85 part = getrawpartition(); 86 if (part < 0) 87 return -1; /* sysctl(3) in getrawpartition sets errno */ 88 part += 'a'; 89 90 /* 91 * If we are passed a plain name, first try /dev to avoid accidents 92 * with files in the same directory that happen to match disk names. 93 */ 94 if (strchr(path, '/') == NULL) { 95 const char *r = iscooked ? "" : "r"; 96 const char *d = _PATH_DEV; 97 98 f = opd(buf, buflen, ofn, flags, "%s%s%s", d, r, path); 99 if (f != -1 || errno != ENOENT) 100 return f; 101 102 f = opd(buf, buflen, ofn, flags, "%s%s%s%c", d, r, path, part); 103 if (f != -1 || errno != ENOENT) 104 return f; 105 } 106 107 f = opd(buf, buflen, ofn, flags, "%s", path); 108 if (f != -1 || errno != ENOENT) 109 return f; 110 111 return opd(buf, buflen, ofn, flags, "%s%c", path, part); 112 } 113 114 int 115 opendisk(const char *path, int flags, char *buf, size_t buflen, int iscooked) 116 { 117 118 return __opendisk(path, flags, buf, buflen, iscooked, open); 119 } 120 121 int 122 opendisk1(const char *path, int flags, char *buf, size_t buflen, int iscooked, 123 int (*ofn)(const char *, int, ...)) 124 { 125 126 return __opendisk(path, flags, buf, buflen, iscooked, ofn); 127 } 128