usr/src/cmd/mail/istext.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 /*
  36  * istext(line, size) - check for text characters
  37  */
  38 int
  39 istext(unsigned char *s, int size)
  40 {
  41         unsigned char *ep;
  42         int c;
  43
  44         for (ep = s+size; --ep >= s; ) {
  45                 c = *ep;
  46                 if ((!isprint(c)) && (!isspace(c)) &&
  47                     /* Since backspace is not included in either of the */
  48                     /* above, must do separately                        */
  49                     /* Bell character is allowable control char in the text */
  50                     (c != 010) && (c != 007)) {
  51                         return(FALSE);
  52                 }
  53         }
  54         return(TRUE);
  55 }