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/* $OpenBSD: vis.c,v 1.18 2005/08/29 18:38:41 otto Exp $ */
/*-
* Copyright (c) 1989, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 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. 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
* SUCH DAMAGE.
*/
#include <sys/types.h>
#include <limits.h>
#include <ctype.h>
#include <string.h>
#include <vis.h>
#define isoctal(c) (((u_char)(c)) >= '0' && ((u_char)(c)) <= '7')
#define isvisible(c) \
(((u_int)(c) <= UCHAR_MAX && isascii((u_char)(c)) && \
(((c) != '*' && (c) != '?' && (c) != '[' && (c) != '#') || \
(flag & VIS_GLOB) == 0) && isgraph((u_char)(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' || \
isgraph((u_char)(c)))))
/*
* vis - visually encode characters
*/
char *
vis(char *dst, int c, int flag, int nextc)
{
c = (unsigned char)c;
if (flag & VIS_HTTPSTYLE) {
/* Described in RFC 1808 */
if (!(isalnum(c) /* alpha-numeric */
/* safe */
|| c == '$' || c == '-' || c == '_' || c == '.' || c == '+'
/* extra */
|| c == '!' || c == '*' || c == '\'' || c == '('
|| c == ')' || c == ',')) {
*dst++ = '%';
snprintf(dst, 4, (c < 16 ? "0%X" : "%X"), c);
dst += 2;
goto done;
}
}
if ((flag & VIS_GLOB) &&
(c == '*' || c == '?' || c == '[' || c == '#'))
;
else if (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'))) {
*dst++ = c;
if (c == '\\' && (flag & VIS_NOSLASH) == 0)
*dst++ = '\\';
*dst = '\0';
return (dst);
}
if (flag & VIS_CSTYLE) {
switch(c) {
case '\n':
*dst++ = '\\';
*dst++ = 'n';
goto done;
case '\r':
*dst++ = '\\';
*dst++ = 'r';
goto done;
case '\b':
*dst++ = '\\';
*dst++ = 'b';
goto done;
case '\a':
*dst++ = '\\';
*dst++ = 'a';
goto done;
case '\v':
*dst++ = '\\';
*dst++ = 'v';
goto done;
case '\t':
*dst++ = '\\';
*dst++ = 't';
goto done;
case '\f':
*dst++ = '\\';
*dst++ = 'f';
goto done;
case ' ':
*dst++ = '\\';
*dst++ = 's';
goto done;
case '\0':
*dst++ = '\\';
*dst++ = '0';
if (isoctal(nextc)) {
*dst++ = '0';
*dst++ = '0';
}
goto done;
}
}
if (((c & 0177) == ' ') || isgraph(c) || (flag & VIS_OCTAL)) {
*dst++ = '\\';
*dst++ = ((u_char)c >> 6 & 07) + '0';
*dst++ = ((u_char)c >> 3 & 07) + '0';
*dst++ = ((u_char)c & 07) + '0';
goto done;
}
if ((flag & VIS_NOSLASH) == 0)
*dst++ = '\\';
if (c & 0200) {
c &= 0177;
*dst++ = 'M';
}
if (iscntrl(c)) {
*dst++ = '^';
if (c == 0177)
*dst++ = '?';
else
*dst++ = c + '@';
} else {
*dst++ = '-';
*dst++ = c;
}
done:
*dst = '\0';
return (dst);
}
/*
* strvis, strnvis, 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 NUL,
* is returned.
*
* Strnvis will write no more than siz-1 bytes (and will NULL terminate).
* The number of bytes needed to fully encode the string is returned.
*
* Strvisx encodes exactly len bytes from src into dst.
* This is useful for encoding a block of data.
*/
int
strvis(char *dst, const char *src, int flag)
{
char c;
char *start;
for (start = dst; (c = *src); )
dst = vis(dst, c, flag, *++src);
*dst = '\0';
return (dst - start);
}
int
strnvis(char *dst, const char *src, size_t siz, int flag)
{
char *start, *end;
char tbuf[5];
int c, i;
i = 0;
for (start = dst, end = start + siz - 1; (c = *src) && dst < end; ) {
if (isvisible(c)) {
i = 1;
*dst++ = c;
if (c == '\\' && (flag & VIS_NOSLASH) == 0) {
/* need space for the extra '\\' */
if (dst < end)
*dst++ = '\\';
else {
dst--;
i = 2;
break;
}
}
src++;
} else {
i = vis(tbuf, c, flag, *++src) - tbuf;
if (dst + i <= end) {
memcpy(dst, tbuf, i);
dst += i;
} else {
src--;
break;
}
}
}
if (siz > 0)
*dst = '\0';
if (dst + i > end) {
/* adjust return value for truncation */
while ((c = *src))
dst += vis(tbuf, c, flag, *++src) - tbuf;
}
return (dst - start);
}
int
strvisx(char *dst, const char *src, size_t len, int flag)
{
int c;
char *start;
for (start = dst; len > 1; len--) {
c = *src;
dst = vis(dst, c, flag, *++src);
}
if (len)
dst = vis(dst, *src, flag, '\0');
*dst = '\0';
return (dst - start);
}
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