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 /*
23 * Copyright 1989 Sun Microsystems, Inc. All rights reserved.
24 * Use is subject to license terms.
25 */
26
27 /* Copyright (c) 1984 AT&T */
28 /* All Rights Reserved */
29 #pragma ident "%Z%%M% %I% %E% SMI" /* from S5R2 1.2 */
30
31 /*LINTLIBRARY*/
32 /*
33 * Library routine to GET the Current Working Directory.
34 * arg1 is a pointer to a character buffer into which the
35 * path name of the current directory is placed by the
36 * subroutine. arg1 may be zero, in which case the
37 * subroutine will call malloc to get the required space.
38 * arg2 is the length of the buffer space for the path-name.
39 * If the actual path-name is longer than (arg2-2), or if
40 * the value of arg2 is not at least 3, the subroutine will
41 * return a value of zero, with errno set as appropriate.
42 */
43
44 #include <stdio.h>
45 #include <sys/errno.h>
46
47 extern FILE *popen();
48 extern char *malloc(), *fgets(), *strchr();
49 extern int errno, pclose();
50
51 char *
getcwd(arg1,arg2)52 getcwd(arg1, arg2)
53 char *arg1;
54 int arg2;
55 {
56 FILE *pipe;
57 char *trm;
58
59 if(arg2 <= 0) {
60 errno = EINVAL;
61 return(0);
62 }
63 if(arg1 == 0)
64 if((arg1 = malloc((unsigned)arg2)) == 0) {
65 errno = ENOMEM;
66 return(0);
67 }
68 errno = 0;
69 if((pipe = popen("pwd", "r")) == 0)
70 return(0);
71 (void) fgets(arg1, arg2, pipe);
72 (void) pclose(pipe);
73 trm = strchr(arg1, '\0');
74 if(*(trm-1) != '\n') {
75 errno = ERANGE;
76 return(0);
77 }
78 *(trm-1) = '\0';
79 return(arg1);
80 }
81