xref: /illumos-gate/usr/src/ucbcmd/printenv/printenv.c (revision 20a7641f9918de8574b8b3b47dbe35c4bfc78df1)
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 /*
24  * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
25  * Use is subject to license terms.
26  */
27 
28 /*	Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T	*/
29 /*	  All Rights Reserved  	*/
30 
31 /*
32  * University Copyright- Copyright (c) 1982, 1986, 1988
33  * The Regents of the University of California
34  * All Rights Reserved
35  *
36  * University Acknowledgment- Portions of this document are derived from
37  * software developed by the University of California, Berkeley, and its
38  * contributors.
39  */
40 
41 /*
42  * printenv
43  */
44 
45 #include <stdio.h>
46 
47 extern	char **environ;
48 
49 static int prefix(char *cp, char *dp);
50 
51 int
52 main(int argc, char *argv[])
53 {
54 	char **ep;
55 	int found = 0;
56 
57 	argc--, argv++;
58 
59 	if (environ)
60 		for (ep = environ; *ep; ep++)
61 			if (argc == 0 || prefix(argv[0], *ep)) {
62 				char *cp = *ep;
63 
64 				found++;
65 				if (argc) {
66 					while (*cp && *cp != '=')
67 						cp++;
68 					if (*cp == '=')
69 						cp++;
70 				}
71 				(void) printf("%s\n", cp);
72 			}
73 	return (!found);
74 }
75 
76 static int
77 prefix(char *cp, char *dp)
78 {
79 
80 	while (*cp && *dp && *cp == *dp)
81 		cp++, dp++;
82 	if (*cp == 0)
83 		return (*dp == '=');
84 	return (0);
85 }
86