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      1 /*	$NetBSD: openspecial.c,v 1.2 2026/05/03 17:49:58 kre Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2026 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 
     32 #include <sys/cdefs.h>
     33 __RCSID("$NetBSD: openspecial.c,v 1.2 2026/05/03 17:49:58 kre Exp $");
     34 
     35 #include <sys/types.h>
     36 #include <sys/param.h>
     37 #include <sys/stat.h>
     38 
     39 #include <err.h>
     40 #include <errno.h>
     41 #include <fcntl.h>
     42 #include <util.h>
     43 #include <unistd.h>
     44 #include <stdlib.h>
     45 #include <fstab.h>
     46 #include <string.h>
     47 
     48 #include "partutil.h"
     49 
     50 
     51 const char *
     52 findspecial(const char *special, int flags)
     53 {
     54 	static char specname[MAXPATHLEN];
     55 	static char rawname[MAXPATHLEN];
     56 	const char *raw;
     57 	struct fstab *fs;
     58 
     59 	fs = getfsfile(special);
     60 	if (fs)
     61 		special = fs->fs_spec;
     62 
     63 	raw = getfsspecname(specname, sizeof(specname), special);
     64 	if (raw == NULL) {
     65 		if (flags & 1)
     66 			err(EXIT_FAILURE, "%s: %s", special, specname);
     67 		else
     68 			return NULL;
     69 	}
     70 
     71 	special = getdiskrawname(rawname, sizeof(rawname), raw);
     72 	if (special == NULL)
     73 		special = raw;
     74 
     75 	return special;
     76 }
     77