text: /*	$NetBSD: getfsspecname.c,v 1.4 2013/01/01 18:32:17 dsl Exp $	*/
  
  /*-
   * Copyright (c) 2012 The NetBSD Foundation, Inc.
   * All rights reserved.
   *
   * This code is derived from software contributed to The NetBSD Foundation
   * by Christos Zoulas.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in the
   *    documentation and/or other materials provided with the distribution.
   *
   * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
   * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
   * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
   * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
   * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   * POSSIBILITY OF SUCH DAMAGE.
   */
  #include <sys/cdefs.h>
  __RCSID("$NetBSD: getfsspecname.c,v 1.4 2013/01/01 18:32:17 dsl Exp $");
  
  #include <sys/types.h>
  #include <sys/ioctl.h>
  #include <sys/sysctl.h>
  #include <sys/disk.h>
  
  #include <stdio.h>
  #include <vis.h>
  #include <string.h>
  #include <fstab.h>
  #include <fcntl.h>
  #include <stdlib.h>
  #include <errno.h>
  #include <unistd.h>
  #include <util.h>
  
  #if !defined(__minix)
  #define COMPAT_DKWEDGE	/* To be removed */
  #endif /* !defined(__minix) */
  
  const char *
  getfsspecname(char *buf, size_t bufsiz, const char *name)
  {
  	static const int mib[] = { CTL_HW, HW_DISKNAMES };
  	static const unsigned int miblen = __arraycount(mib);
  	char *drives, *dk;
  	size_t len;
  	int fd, savee;
  	char *vname;
  
  	drives = NULL;
  	vname = NULL;
  	if (strncasecmp(name, "NAME=", 5) != 0) {
  #ifdef COMPAT_DKWEDGE
  		/*
  		 * We try to open the disk name, and if we fail with EBUSY
  		 * we use the name as the label to find the wedge.
  		 */
  		char rbuf[MAXPATHLEN];
  		if (name[0] == '/') {
  			if (getdiskrawname(rbuf, sizeof(rbuf), name) != NULL) {
  				if ((fd = open(rbuf, O_RDONLY)) == -1) {
  					if (errno == EBUSY) {
  						name = strrchr(name, '/') + 1;
  						goto search;
  					}
  				} else
  					close(fd);
  			}
  		}
  #endif
  		strlcpy(buf, name, bufsiz);
  		return buf;
  	} else
  		name += 5;
  
  #ifdef COMPAT_DKWEDGE
  search:
  #endif
  	vname = malloc(strlen(name) * 4 + 1);
  	if (vname == NULL) {
  		savee = errno;
  		strlcpy(buf, "malloc failed", bufsiz);
  		goto out;
  	}
  
  	strunvis(vname, name);
  
  	if (sysctl(mib, miblen, NULL, &len, NULL, 0) == -1) {
  		savee = errno;
  		strlcpy(buf, "sysctl hw.disknames failed", bufsiz);
  		goto out;
  	}
  
  	drives = malloc(len);
  	if (drives == NULL) {
  		savee = errno;
  		strlcpy(buf, "malloc failed", bufsiz);
  		goto out;
  	}
  	if (sysctl(mib, miblen, drives, &len, NULL, 0) == -1) {
  		savee = errno;
  		strlcpy(buf, "sysctl hw.disknames failed", bufsiz);
  		goto out;
  	}
  
  	for (dk = strtok(drives, " "); dk != NULL; dk = strtok(NULL, " ")) {
  		struct dkwedge_info dkw;
  		if (strncmp(dk, "dk", 2) != 0)
  			continue;
  		fd = opendisk(dk, O_RDONLY, buf, bufsiz, 0);
  		if (fd == -1)
  			continue;
  		if (ioctl(fd, DIOCGWEDGEINFO, &dkw) == -1) {
  			savee = errno;
  			snprintf(buf, bufsiz, "%s: getwedgeinfo", dk);
  			(void)close(fd);
  			goto out;
  		}
  		(void)close(fd);
  		if (strcmp(vname, (char *)dkw.dkw_wname) == 0) {
  			char *p = strstr(buf, "/rdk");
  			if (p++ == NULL) 
  				return buf;
  			strcpy(p, p + 1);
  			free(drives);
  			free(vname);
  			return buf;
  		}
  	}
  	savee = ESRCH;
  	snprintf(buf, bufsiz, "no match for `%s'", vname);
  out:
  	free(drives);
  	free(vname);
  	errno = savee;
  	return NULL;
  }
  