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getdiskrawname.c revision 1.1.2.3 
      1 /*	$NetBSD: getdiskrawname.c,v 1.1.2.3 2014/05/22 11:37:00 yamt 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 1.1.2.3 2014/05/22 11:37:00 yamt 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