xref: /illumos-gate/usr/src/cmd/mail/getcomment.c (revision b7d62af5b42f0da2eb668e8d33d24d2f4fdd98a8)
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 2005 Sun Microsystems, Inc.  All rights reserved.
24  * Use is subject to license terms.
25  */
26 
27 /*	Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T	*/
28 /*	  All Rights Reserved  	*/
29 
30 
31 #pragma ident	"%Z%%M%	%I%	%E% SMI"
32 
33 #include "mail.h"
34 /*
35  * Get comment field, if any, from line.
36  *	1 ==> found comment.
37  *	0 ==> no comment found.
38  *     -1 ==> no closing (terminating) paren found for comment.
39  */
40 
41 int
42 getcomment(char *s, char *q)
43 	/* Copy comment, if found, to q */
44 {
45 	char	*p, *sav_q;
46 	int	depth = 0;
47 
48 	if ((p = strchr(s, '(')) == (char *)NULL) {
49 		/* no comment found */
50 		return (0);
51 	}
52 	sav_q = q;
53 	while (*p) {
54 		*q++ = *p;
55 		if (*p == ')') {
56 			/* account for nested parens within comment */
57 			depth--;
58 			if (depth == 0) {
59 				break;
60 			}
61 		} else if (*p == '(') {
62 			depth++;
63 		}
64 		p++;
65 	}
66 	*q = '\0';
67 	if (*p != ')') {
68 		/* closing paren not found */
69 		*sav_q = '\0';
70 		return (-1);
71 	}
72 	/* found comment */
73 	return (1);
74 }
75