137 lines
3.4 KiB
C
137 lines
3.4 KiB
C
/* $NetBSD: getdiskrawname.c,v 1.5 2014/09/17 23:54:42 christos Exp $ */
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/*-
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* Copyright (c) 2012 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Christos Zoulas.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__RCSID("$NetBSD: getdiskrawname.c,v 1.5 2014/09/17 23:54:42 christos Exp $");
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#include <sys/stat.h>
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#include <stdio.h>
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#include <string.h>
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#include <errno.h>
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#include <util.h>
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#include <limits.h>
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#include <unistd.h>
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static const char *
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resolve_link(char *buf, size_t bufsiz, const char *name)
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{
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const char *dp;
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size_t nlen;
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ssize_t dlen;
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dlen = readlink(name, buf, bufsiz - 1);
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if (dlen == -1)
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return name;
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buf[dlen] = '\0';
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if (buf[0] != '/') {
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dp = strrchr(name, '/');
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if (dp != NULL) {
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nlen = dp - name + 1;
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if (nlen + 1 > bufsiz)
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return NULL;
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if (nlen + dlen + 1 > bufsiz)
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return NULL;
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memmove(buf + nlen, buf, (size_t)dlen + 1);
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memcpy(buf, name, nlen);
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}
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}
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return buf;
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}
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const char *
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getdiskrawname(char *buf, size_t bufsiz, const char *name)
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{
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const char *dp;
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struct stat st;
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char dest[PATH_MAX];
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if ((name = resolve_link(dest, sizeof(dest), name)) == NULL) {
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errno = EINVAL;
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return NULL;
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}
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dp = strrchr(name, '/');
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if (stat(name, &st) == -1)
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return NULL;
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if (!S_ISBLK(st.st_mode)) {
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errno = EFTYPE;
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return NULL;
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}
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if (dp != NULL)
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(void)snprintf(buf, bufsiz, "%.*s/r%s", (int)(dp - name), name, dp + 1);
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else
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(void)snprintf(buf, bufsiz, "r%s", name);
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return buf;
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}
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const char *
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getdiskcookedname(char *buf, size_t bufsiz, const char *name)
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{
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const char *dp;
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struct stat st;
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char dest[PATH_MAX];
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if ((name = resolve_link(dest, sizeof(dest), name)) == NULL) {
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errno = EINVAL;
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return NULL;
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}
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dp = strrchr(name, '/');
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if ((dp != NULL && dp[1] != 'r') || (dp == NULL && name[0] != 'r')) {
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errno = EINVAL;
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return NULL;
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}
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if (stat(name, &st) == -1)
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return NULL;
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if (!S_ISCHR(st.st_mode)) {
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errno = EFTYPE;
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return NULL;
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}
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if (dp != NULL)
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(void)snprintf(buf, bufsiz, "%.*s/%s", (int)(dp - name), name, dp + 2);
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else
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(void)snprintf(buf, bufsiz, "%s", name + 1);
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return buf;
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}
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