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(HAVE_STRNVIS)
36 #if defined(LIBC_SCCS) && !defined(lint)
37 static char rcsid[] = "$OpenBSD: vis.c,v 1.8 2002/02/19 19:39:36 millert Exp $";
38 #endif /* LIBC_SCCS and not lint */
44 #define isoctal(c) (((u_char)(c)) >= '0' && ((u_char)(c)) <= '7')
45 #define isvisible(c) (((u_int)(c) <= UCHAR_MAX && isascii((u_char)(c)) && \
46 isgraph((u_char)(c))) || \
47 ((flag & VIS_SP) == 0 && (c) == ' ') || \
48 ((flag & VIS_TAB) == 0 && (c) == '\t') || \
49 ((flag & VIS_NL) == 0 && (c) == '\n') || \
50 ((flag & VIS_SAFE) && \
51 ((c) == '\b' || (c) == '\007' || (c) == '\r')))
54 * vis - visually encode characters
57 vis(dst, c, flag, nextc)
64 if (c == '\\' && (flag & VIS_NOSLASH) == 0)
70 if (flag & VIS_CSTYLE) {
107 if (isoctal(nextc)) {
114 if (((c & 0177) == ' ') || (flag & VIS_OCTAL)) {
116 *dst++ = ((u_char)c >> 6 & 07) + '0';
117 *dst++ = ((u_char)c >> 3 & 07) + '0';
118 *dst++ = ((u_char)c & 07) + '0';
121 if ((flag & VIS_NOSLASH) == 0)
143 * strvis, strnvis, strvisx - visually encode characters from src into dst
145 * Dst must be 4 times the size of src to account for possible
146 * expansion. The length of dst, not including the trailing NULL,
149 * Strnvis will write no more than siz-1 bytes (and will NULL terminate).
150 * The number of bytes needed to fully encode the string is returned.
152 * Strvisx encodes exactly len bytes from src into dst.
153 * This is useful for encoding a block of data.
156 strvis(dst, src, flag)
158 register const char *src;
164 for (start = dst; (c = *src);)
165 dst = vis(dst, c, flag, *++src);
167 return (dst - start);
171 strnvis(dst, src, siz, flag)
173 register const char *src;
180 for (start = dst, end = start + siz - 1; (c = *src) && dst < end; ) {
183 if (c == '\\' && (flag & VIS_NOSLASH) == 0) {
184 /* need space for the extra '\\' */
194 /* vis(3) requires up to 4 chars */
196 dst = vis(dst, c, flag, *++src);
205 /* adjust return value for truncation */
207 dst += vis(tbuf, c, flag, *++src) - tbuf;
209 return (dst - start);
213 strvisx(dst, src, len, flag)
215 register const char *src;
222 for (start = dst; len > 1; len--) {
224 dst = vis(dst, c, flag, *++src);
227 dst = vis(dst, *src, flag, '\0');
229 return (dst - start);