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/* SPDX-License-Identifier: GPL-3.0-or-later */
/*
* Copyright (C) 2018 - David Oberhollenzer
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include <stdlib.h>
#include <ctype.h>
#include <errno.h>
#include "util.h"
static int xdigit(int x)
{
if (isupper(x))
return x - 'A' + 0x0A;
if (islower(x))
return x - 'a' + 0x0A;
return x - '0';
}
int unescape(char *src)
{
char *dst = src;
int c;
for (;;) {
while (*src != '"' && *src != '\0')
*(dst++) = *(src++);
if (*src == '\0')
break;
++src;
while ((c = *(src++)) != '"') {
if (c == '\0')
return -1;
if (c == '\\') {
c = *(src++);
switch (c) {
case 'a': c = '\a'; break;
case 'b': c = '\b'; break;
case 'f': c = '\f'; break;
case 'n': c = '\n'; break;
case 't': c = '\t'; break;
case '\\':
case '"':
case '%':
break;
case 'x':
c = 0;
if (isxdigit(*src))
c = (c<<4) | xdigit(*(src++));
if (isxdigit(*src))
c = (c<<4) | xdigit(*(src++));
break;
case '0':
c = 0;
if (isdigit(*src) && *src < '8')
c = (c<<3) | (*(src++) - '0');
if (isdigit(*src) && *src < '8')
c = (c<<3) | (*(src++) - '0');
if (isdigit(*src) && *src < '8')
c = (c<<3) | (*(src++) - '0');
break;
default:
return -1;
}
if (c == 0)
return -1;
}
*(dst++) = c;
}
}
*(dst++) = '\0';
return 0;
}
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