* Copyright (c) 1989 The Regents of the University of California.
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid
[] = "@(#)vis.c 5.4 (Berkeley) 2/23/91";
#endif /* LIBC_SCCS and not lint */
#define isoctal(c) (((u_char)(c)) >= '0' && ((u_char)(c)) <= '7')
* vis - visually encode characters
vis(register char *dst
, register char c
, register int flag
, char nextc
)
if (isascii(c
) && isgraph(c
) ||
((flag
& VIS_SP
) == 0 && c
== ' ') ||
((flag
& VIS_TAB
) == 0 && c
== '\t') ||
((flag
& VIS_NL
) == 0 && c
== '\n') ||
((flag
& VIS_SAFE
) && (c
== '\b' || c
== '\007' || c
== '\r'))) {
if (c
== '\\' && (flag
& VIS_NOSLASH
) == 0)
if (((c
& 0177) == ' ') || (flag
& VIS_OCTAL
)) {
*dst
++ = ((u_char
)c
>> 6 & 07) + '0';
*dst
++ = ((u_char
)c
>> 3 & 07) + '0';
*dst
++ = ((u_char
)c
& 07) + '0';
if ((flag
& VIS_NOSLASH
) == 0)
* strvis, strvisx - visually encode characters from src into dst
* Dst must be 4 times the size of src to account for possible
* expansion. The length of dst, not including the trailing NULL,
* Strvisx encodes exactly len bytes from src into dst.
* This is useful for encoding a block of data.
register const char *src
;
dst
= vis(dst
, c
, flag
, *(src
+1));
strvisx(dst
, src
, len
, flag
)
register const char *src
;
dst
= vis(dst
, *src
, flag
, *(src
+1));
dst
= vis(dst
, *src
, flag
, '\0');