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
41int
42getcomment(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