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 1.6 2000/11/21 00:47:28 millert Exp $";
36 #endif /* LIBC_SCCS and not lint */
42 #define isoctal(c) (((u_char)(c)) >= '0' && ((u_char)(c)) <= '7')
43 #define isvisible(c) (((u_int)(c) <= UCHAR_MAX && isascii((u_char)(c)) && \
44 isgraph((u_char)(c))) || \
45 ((flag & VIS_SP) == 0 && (c) == ' ') || \
46 ((flag & VIS_TAB) == 0 && (c) == '\t') || \
47 ((flag & VIS_NL) == 0 && (c) == '\n') || \
48 ((flag & VIS_SAFE) && \
49 ((c) == '\b' || (c) == '\007' || (c) == '\r')))
52 * vis - visually encode characters
54 char *vis(char *dst, int c, int flag, int nextc)
58 if (c == '\\' && (flag & VIS_NOSLASH) == 0)
64 if (flag & VIS_CSTYLE) {
105 if (isoctal(nextc)) {
112 if (((c & 0177) == ' ') || (flag & VIS_OCTAL)) {
114 *dst++ = ((u_char)c >> 6 & 07) + '0';
115 *dst++ = ((u_char)c >> 3 & 07) + '0';
116 *dst++ = ((u_char)c & 07) + '0';
119 if ((flag & VIS_NOSLASH) == 0)
139 #endif /* HAVE_VIS */