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
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9 * notice, this list of conditions and the following disclaimer.
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11 * notice, this list of conditions and the following disclaimer in the
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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
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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 1.6 2005/11/13 00:07:42 swildner 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(char *dst
, int c
, int flag
, int nextc
)
54 if (flag
& VIS_HTTPSTYLE
) {
55 /* Described in RFC 1808 */
56 if (!(isalnum(c
) /* alpha-numeric */
58 || c
== '$' || c
== '-' || c
== '_' || c
== '.' || c
== '+'
60 || c
== '!' || c
== '*' || c
== '\'' || c
== '('
61 || c
== ')' || c
== ',')) {
63 snprintf(dst
, 4, (c
< 16 ? "0%X" : "%X"), c
);
69 if ((flag
& VIS_GLOB
) &&
70 (c
== '*' || c
== '?' || c
== '[' || c
== '#'))
72 else if (isgraph(c
) ||
73 ((flag
& VIS_SP
) == 0 && c
== ' ') ||
74 ((flag
& VIS_TAB
) == 0 && c
== '\t') ||
75 ((flag
& VIS_NL
) == 0 && c
== '\n') ||
76 ((flag
& VIS_SAFE
) && (c
== '\b' || c
== '\007' || c
== '\r'))) {
78 if (c
== '\\' && (flag
& VIS_NOSLASH
) == 0)
84 if (flag
& VIS_CSTYLE
) {
121 if (isoctal(nextc
)) {
128 if (((c
& 0177) == ' ') || isgraph(c
) || (flag
& VIS_OCTAL
)) {
130 *dst
++ = ((u_char
)c
>> 6 & 07) + '0';
131 *dst
++ = ((u_char
)c
>> 3 & 07) + '0';
132 *dst
++ = ((u_char
)c
& 07) + '0';
135 if ((flag
& VIS_NOSLASH
) == 0)
157 * strvis, strvisx - visually encode characters from src into dst
159 * Dst must be 4 times the size of src to account for possible
160 * expansion. The length of dst, not including the trailing NUL,
163 * Strvisx encodes exactly len bytes from src into dst.
164 * This is useful for encoding a block of data.
167 strvis(char *dst
, const char *src
, int flag
)
172 for (start
= dst
; (c
= *src
); )
173 dst
= vis(dst
, c
, flag
, *++src
);
175 return (dst
- start
);
179 strnvis(char *dst
, const char *src
, size_t len
, int flag
)
187 end
= start
+ len
-1;
188 for (; (c
= *src
) != '\0';) {
189 i
= vis(buf
, c
, flag
, *++src
) - buf
;
190 if (start
+ i
> end
) {
200 /* adjust return value for truncation */
201 while ((c
= *src
) != '\0')
202 dst
+= vis(buf
, c
, flag
, *++src
) - buf
;
204 return (dst
- start
);
208 strvisx(char *dst
, const char *src
, size_t len
, int flag
)
213 for (start
= dst
; len
> 1; len
--) {
215 dst
= vis(dst
, c
, flag
, *++src
);
218 dst
= vis(dst
, *src
, flag
, '\0');
221 return (dst
- start
);