2 * Copyright (c) 1989, 1993
3 * The Regents of the University of California. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 #if defined(LIBC_SCCS) && !defined(lint)
35 static char rcsid[] = "$OpenBSD: vis.c,v 1.5 2000/07/19 15:25:13 deraadt Exp $";
36 #endif /* LIBC_SCCS and not lint */
42 #define isoctal(c) (((u_char)(c)) >= '0' && ((u_char)(c)) <= '7')
45 * vis - visually encode characters
47 char *vis(char *dst, int c, int flag, int nextc)
49 if (((u_int)c <= UCHAR_MAX && isascii((u_char)c) &&
50 isgraph((u_char)c)) ||
51 ((flag & VIS_SP) == 0 && c == ' ') ||
52 ((flag & VIS_TAB) == 0 && c == '\t') ||
53 ((flag & VIS_NL) == 0 && c == '\n') ||
54 ((flag & VIS_SAFE) && (c == '\b' || c == '\007' || c == '\r'))) {
56 if (c == '\\' && (flag & VIS_NOSLASH) == 0)
62 if (flag & VIS_CSTYLE) {
103 if (isoctal(nextc)) {
110 if (((c & 0177) == ' ') || (flag & VIS_OCTAL)) {
112 *dst++ = ((u_char)c >> 6 & 07) + '0';
113 *dst++ = ((u_char)c >> 3 & 07) + '0';
114 *dst++ = ((u_char)c & 07) + '0';
117 if ((flag & VIS_NOSLASH) == 0)
137 #endif /* HAVE_VIS */