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/* conversion.c - String conversion helper functions.
* Copyright (C) 2000 Werner Koch (dd9jn)
* Copyright (C) 2001, 2002, 2003, 2004, 2007, 2009 g10 Code GmbH
*
* This file is part of Assuan.
*
* Assuan is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* Assuan is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this program; if not, see <http://www.gnu.org/licenses/>.
* SPDX-License-Identifier: LGPL-2.1+
*/
#if HAVE_CONFIG_H
#include <config.h>
#endif
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <ctype.h>
#include "assuan-defs.h"
#include "debug.h"
/* Convert the number NR to a hexadecimal string. Returns the tail
pointer. */
static char *
_assuan_bytetohex (int nr, char *str)
{
static char hexdigits[] = "0123456789abcdef";
int i;
#define NROFHEXDIGITS 2
for (i = 0; i < NROFHEXDIGITS; i++)
{
int digit = (nr >> (i << 2)) & 0xf;
*(str++) = hexdigits[digit];
}
return str;
}
/* Encode the C formatted string SRC and return the malloc'ed result. */
char *
_assuan_encode_c_string (assuan_context_t ctx, const char *src)
{
const unsigned char *istr;
char *res;
char *ostr;
ostr = _assuan_malloc (ctx, 4 * strlen (src) + 1);
if (! *ostr)
return NULL;
res = ostr;
for (istr = (const unsigned char *) src; *istr; istr++)
{
int c = 0;
switch (*istr)
{
case '\r':
c = 'r';
break;
case '\n':
c = 'n';
break;
case '\f':
c = 'f';
break;
case '\v':
c = 'v';
break;
case '\b':
c = 'b';
break;
default:
if ((isascii (*istr) && isprint (*istr)) || (*istr >= 0x80))
*(ostr++) = *istr;
else
{
*(ostr++) = '\\';
*(ostr++) = 'x';
ostr = _assuan_bytetohex (*istr, ostr);
}
}
if (c)
{
*(ostr++) = '\\';
*(ostr++) = c;
}
}
*(ostr) = '\0';
return res;
}

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