istext.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/*
36 * istext(line, size) - check for text characters
37 */
38int
39istext(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}
56