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. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 #if !defined(HAVE_STRNVIS)
32 #if defined(LIBC_SCCS) && !defined(lint)
33 static char rcsid[] = "$OpenBSD: vis.c,v 1.12 2003/06/02 20:18:35 millert Exp $";
34 #endif /* LIBC_SCCS and not lint */
41 #define isoctal(c) (((u_char)(c)) >= '0' && ((u_char)(c)) <= '7')
42 #define isvisible(c) (((u_int)(c) <= UCHAR_MAX && isascii((u_char)(c)) && \
43 isgraph((u_char)(c))) || \
44 ((flag & VIS_SP) == 0 && (c) == ' ') || \
45 ((flag & VIS_TAB) == 0 && (c) == '\t') || \
46 ((flag & VIS_NL) == 0 && (c) == '\n') || \
47 ((flag & VIS_SAFE) && ((c) == '\b' || \
48 (c) == '\007' || (c) == '\r' || \
49 isgraph((u_char)(c)))))
52 * vis - visually encode characters
55 vis(dst, c, flag, nextc)
62 if (c == '\\' && (flag & VIS_NOSLASH) == 0)
68 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)
141 * strvis, strnvis, strvisx - visually encode characters from src into dst
143 * Dst must be 4 times the size of src to account for possible
144 * expansion. The length of dst, not including the trailing NULL,
147 * Strnvis will write no more than siz-1 bytes (and will NULL terminate).
148 * The number of bytes needed to fully encode the string is returned.
150 * Strvisx encodes exactly len bytes from src into dst.
151 * This is useful for encoding a block of data.
154 strvis(dst, src, flag)
156 register const char *src;
162 for (start = dst; (c = *src);)
163 dst = vis(dst, c, flag, *++src);
165 return (dst - start);
169 strnvis(dst, src, siz, flag)
181 for (start = dst, end = start + siz - 1; (c = *src) && dst < end; ) {
185 if (c == '\\' && (flag & VIS_NOSLASH) == 0) {
186 /* need space for the extra '\\' */
197 i = vis(tbuf, c, flag, *++src) - tbuf;
198 if (dst + i <= end) {
199 memcpy(dst, tbuf, i);
210 /* adjust return value for truncation */
212 dst += vis(tbuf, c, flag, *++src) - tbuf;
214 return (dst - start);
218 strvisx(dst, src, len, flag)
220 register const char *src;
227 for (start = dst; len > 1; len--) {
229 dst = vis(dst, c, flag, *++src);
232 dst = vis(dst, *src, flag, '\0');
234 return (dst - start);