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 * 4. 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(LIBC_SCCS) && !defined(lint)
31 static char sccsid[] = "@(#)vis.c 8.1 (Berkeley) 7/19/93";
32 #endif /* LIBC_SCCS and not lint */
33 #include <sys/cdefs.h>
34 __FBSDID("$FreeBSD$");
36 #include <sys/types.h>
42 #define isoctal(c) (((u_char)(c)) >= '0' && ((u_char)(c)) <= '7')
45 * vis - visually encode characters
48 vis(dst, c, flag, nextc)
55 if (flag & VIS_HTTPSTYLE) {
56 /* Described in RFC 1808 */
57 if (!(isalnum(c) /* alpha-numeric */
59 || c == '$' || c == '-' || c == '_' || c == '.' || c == '+'
61 || c == '!' || c == '*' || c == '\'' || c == '('
62 || c == ')' || c == ',')) {
64 snprintf(dst, 4, (c < 16 ? "0%X" : "%X"), c);
70 if ((flag & VIS_GLOB) &&
71 (c == '*' || c == '?' || c == '[' || c == '#'))
73 else if (isgraph(c) ||
74 ((flag & VIS_SP) == 0 && c == ' ') ||
75 ((flag & VIS_TAB) == 0 && c == '\t') ||
76 ((flag & VIS_NL) == 0 && c == '\n') ||
77 ((flag & VIS_SAFE) && (c == '\b' || c == '\007' || c == '\r'))) {
79 if (c == '\\' && (flag & VIS_NOSLASH) == 0)
85 if (flag & VIS_CSTYLE) {
122 if (isoctal(nextc)) {
129 if (((c & 0177) == ' ') || isgraph(c) || (flag & VIS_OCTAL)) {
131 *dst++ = ((u_char)c >> 6 & 07) + '0';
132 *dst++ = ((u_char)c >> 3 & 07) + '0';
133 *dst++ = ((u_char)c & 07) + '0';
136 if ((flag & VIS_NOSLASH) == 0)
158 * strvis, strvisx - visually encode characters from src into dst
160 * Dst must be 4 times the size of src to account for possible
161 * expansion. The length of dst, not including the trailing NUL,
164 * Strvisx encodes exactly len bytes from src into dst.
165 * This is useful for encoding a block of data.
168 strvis(dst, src, flag)
176 for (start = dst; (c = *src); )
177 dst = vis(dst, c, flag, *++src);
179 return (dst - start);
183 strvisx(dst, src, len, flag)
192 for (start = dst; len > 1; len--) {
194 dst = vis(dst, c, flag, *++src);
197 dst = vis(dst, *src, flag, '\0');
200 return (dst - start);