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 /*	Copyright (c) 1988 AT&T	*/
23 /*	  All Rights Reserved  	*/
24 
25 
26 /*
27  * Copyright (c) 1999 by Sun Microsystems, Inc.
28  * All rights reserved.
29  */
30 
31 #pragma ident	"%Z%%M%	%I%	%E% SMI"
32 
33 #include <sys/types.h>	/* needed by stat.h */
34 #include <sys/stat.h>	/* stat */
35 #include <stdio.h>	/* NULL */
36 #include <string.h>	/* string functions */
37 #include <stdlib.h>
38 
39 /*
40  * if the ksh PWD environment variable matches the current
41  * working directory, don't call getwd()
42  */
43 
44 char *
mygetwd(char * dir)45 mygetwd(char *dir)
46 {
47 	char	*pwd;			/* PWD environment variable value */
48 	struct	stat	d_sb;  		/* current directory status */
49 	struct	stat	tmp_sb; 	/* temporary stat buffer */
50 	char	*getwd();
51 
52 	/* get the current directory's status */
53 	if (stat(".", &d_sb) < 0) {
54 		return (NULL);
55 	}
56 	/* use $PWD if it matches this directory */
57 	if ((pwd = getenv("PWD")) != NULL && *pwd != '\0' &&
58 	    stat(pwd, &tmp_sb) == 0 &&
59 	    d_sb.st_ino == tmp_sb.st_ino && d_sb.st_dev == tmp_sb.st_dev) {
60 		(void) strcpy(dir, pwd);
61 		return (pwd);
62 	}
63 	return (getwd(dir));
64 }
65