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      1 /*
      2  * CDDL HEADER START
      3  *
      4  * The contents of this file are subject to the terms of the
      5  * Common Development and Distribution License, Version 1.0 only
      6  * (the "License").  You may not use this file except in compliance
      7  * with the License.
      8  *
      9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
     10  * or http://www.opensolaris.org/os/licensing.
     11  * See the License for the specific language governing permissions
     12  * and limitations under the License.
     13  *
     14  * When distributing Covered Code, include this CDDL HEADER in each
     15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
     16  * If applicable, add the following below this CDDL HEADER, with the
     17  * fields enclosed by brackets "[]" replaced with your own identifying
     18  * information: Portions Copyright [yyyy] [name of copyright owner]
     19  *
     20  * CDDL HEADER END
     21  */
     22 #ident	"@(#)resolvepath.c	1.2	05/06/08 SMI"
     23 
     24 /*
     25  * Copyright 1997 by Sun Microsystems, Inc.
     26  * All rights reserved.
     27  */
     28 
     29 #include <sys/param.h>
     30 #include <sys/types.h>
     31 #include <sys/systm.h>
     32 #include <sys/errno.h>
     33 #include <sys/pathname.h>
     34 
     35 int
     36 resolvepath(char *path, char *buf, size_t count)
     37 {
     38 	struct pathname lookpn;
     39 	struct pathname resolvepn;
     40 	int error;
     41 
     42 	if (count == 0)
     43 		return (0);
     44 	if (error = pn_get(path, UIO_USERSPACE, &lookpn))
     45 		return (set_errno(error));
     46 	pn_alloc(&resolvepn);
     47 	error = lookuppn(&lookpn, &resolvepn, FOLLOW, NULL, NULL);
     48 	if (error == 0) {
     49 		if (count > resolvepn.pn_pathlen)
     50 			count = resolvepn.pn_pathlen;
     51 		if (copyout(resolvepn.pn_path, buf, count))
     52 			error = EFAULT;
     53 	}
     54 	pn_free(&resolvepn);
     55 	pn_free(&lookpn);
     56 
     57 	if (error)
     58 		return (set_errno(error));
     59 	return ((int)count);
     60 }
     61