istext.c revision 7c478bd95313f5f23a4c958a745db2134aa03244
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/*	Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T	*/
23/*	  All Rights Reserved  	*/
24
25
26#pragma ident	"%Z%%M%	%I%	%E% SMI" 	/* SVr4.0 1.	*/
27#include "mail.h"
28
29/*
30 * istext(line, size) - check for text characters
31 */
32int
33istext(s, size)
34register unsigned char	*s;
35int 	size;
36{
37	register unsigned char *ep;
38	register c;
39
40	for (ep = s+size; --ep >= s; ) {
41		c = *ep;
42		if ((!isprint(c)) && (!isspace(c)) &&
43		    /* Since backspace is not included in either of the */
44		    /* above, must do separately                        */
45		    /* Bell character is allowable control char in the text */
46		    (c != 010) && (c != 007)) {
47			return(FALSE);
48		}
49	}
50	return(TRUE);
51}
52