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 1.11 2003/05/14 05:16:43 pjanzen Exp $";
38 #endif /* LIBC_SCCS and not lint */
45 #define isoctal(c) (((u_char)(c)) >= '0' && ((u_char)(c)) <= '7')
46 #define isvisible(c) (((u_int)(c) <= UCHAR_MAX && isascii((u_char)(c)) && \
47 isgraph((u_char)(c))) || \
48 ((flag & VIS_SP) == 0 && (c) == ' ') || \
49 ((flag & VIS_TAB) == 0 && (c) == '\t') || \
50 ((flag & VIS_NL) == 0 && (c) == '\n') || \
51 ((flag & VIS_SAFE) && ((c) == '\b' || \
52 (c) == '\007' || (c) == '\r' || \
53 isgraph((u_char)(c)))))
56 * vis - visually encode characters
59 vis(dst, c, flag, nextc)
66 if (c == '\\' && (flag & VIS_NOSLASH) == 0)
72 if (flag & VIS_CSTYLE) {
109 if (isoctal(nextc)) {
116 if (((c & 0177) == ' ') || (flag & VIS_OCTAL)) {
118 *dst++ = ((u_char)c >> 6 & 07) + '0';
119 *dst++ = ((u_char)c >> 3 & 07) + '0';
120 *dst++ = ((u_char)c & 07) + '0';
123 if ((flag & VIS_NOSLASH) == 0)
145 * strvis, strnvis, strvisx - visually encode characters from src into dst
147 * Dst must be 4 times the size of src to account for possible
148 * expansion. The length of dst, not including the trailing NULL,
151 * Strnvis will write no more than siz-1 bytes (and will NULL terminate).
152 * The number of bytes needed to fully encode the string is returned.
154 * Strvisx encodes exactly len bytes from src into dst.
155 * This is useful for encoding a block of data.
158 strvis(dst, src, flag)
160 register const char *src;
166 for (start = dst; (c = *src);)
167 dst = vis(dst, c, flag, *++src);
169 return (dst - start);
173 strnvis(dst, src, siz, flag)
185 for (start = dst, end = start + siz - 1; (c = *src) && dst < end; ) {
189 if (c == '\\' && (flag & VIS_NOSLASH) == 0) {
190 /* need space for the extra '\\' */
201 i = vis(tbuf, c, flag, *++src) - tbuf;
202 if (dst + i <= end) {
203 memcpy(dst, tbuf, i);
214 /* adjust return value for truncation */
216 dst += vis(tbuf, c, flag, *++src) - tbuf;
218 return (dst - start);
222 strvisx(dst, src, len, flag)
224 register const char *src;
231 for (start = dst; len > 1; len--) {
233 dst = vis(dst, c, flag, *++src);
236 dst = vis(dst, *src, flag, '\0');
238 return (dst - start);