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
33 * $FreeBSD: src/lib/libc/gen/vis.c,v 1.13 2003/10/30 12:41:50 phk Exp $
34 * $DragonFly: src/lib/libc/gen/vis.c,v 1.5 2005/09/03 16:25:42 joerg Exp $
37 #include <sys/types.h>
44 #define isoctal(c) (((u_char)(c)) >= '0' && ((u_char)(c)) <= '7')
47 * vis - visually encode characters
50 vis(dst, c, flag, nextc)
57 if (flag & VIS_HTTPSTYLE) {
58 /* Described in RFC 1808 */
59 if (!(isalnum(c) /* alpha-numeric */
61 || c == '$' || c == '-' || c == '_' || c == '.' || c == '+'
63 || c == '!' || c == '*' || c == '\'' || c == '('
64 || c == ')' || c == ',')) {
66 snprintf(dst, 4, (c < 16 ? "0%X" : "%X"), c);
72 if ((flag & VIS_GLOB) &&
73 (c == '*' || c == '?' || c == '[' || c == '#'))
75 else if (isgraph(c) ||
76 ((flag & VIS_SP) == 0 && c == ' ') ||
77 ((flag & VIS_TAB) == 0 && c == '\t') ||
78 ((flag & VIS_NL) == 0 && c == '\n') ||
79 ((flag & VIS_SAFE) && (c == '\b' || c == '\007' || c == '\r'))) {
81 if (c == '\\' && (flag & VIS_NOSLASH) == 0)
87 if (flag & VIS_CSTYLE) {
124 if (isoctal(nextc)) {
131 if (((c & 0177) == ' ') || isgraph(c) || (flag & VIS_OCTAL)) {
133 *dst++ = ((u_char)c >> 6 & 07) + '0';
134 *dst++ = ((u_char)c >> 3 & 07) + '0';
135 *dst++ = ((u_char)c & 07) + '0';
138 if ((flag & VIS_NOSLASH) == 0)
160 * strvis, strvisx - visually encode characters from src into dst
162 * Dst must be 4 times the size of src to account for possible
163 * expansion. The length of dst, not including the trailing NUL,
166 * Strvisx encodes exactly len bytes from src into dst.
167 * This is useful for encoding a block of data.
170 strvis(dst, src, flag)
178 for (start = dst; (c = *src); )
179 dst = vis(dst, c, flag, *++src);
181 return (dst - start);
185 strnvis(char *dst, const char *src, size_t len, int flag)
193 end = start + len -1;
194 for (; (c = *src) != '\0';) {
195 i = vis(buf, c, flag, *++src) - buf;
196 if (start + i > end) {
206 /* adjust return value for truncation */
207 while ((c = *src) != '\0')
208 dst += vis(buf, c, flag, *++src) - buf;
210 return (dst - start);
214 strvisx(dst, src, len, flag)
223 for (start = dst; len > 1; len--) {
225 dst = vis(dst, c, flag, *++src);
228 dst = vis(dst, *src, flag, '\0');
231 return (dst - start);