usr/src/cmd/mail/getcomment.c

   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, '(')) == 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 }