/*
  File: unquote.c

  Copyright (C) 2003 Andreas Gruenbacher <a.gruenbacher@bestbits.at>

  This program 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.

  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 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/>.
*/

#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include "misc.h"

char *unquote(char *str)
{
	unsigned char *s, *t;

	if (!str)
		return str;

	for (s = (unsigned char *)str; *s != '\0'; s++)
		if (*s == '\\')
			break;
	if (*s == '\0')
		return str;

#define isoctal(c) \
	((c) >= '0' && (c) <= '7')

	t = s;
	do {
		if (*s == '\\' &&
		    isoctal(*(s+1)) && isoctal(*(s+2)) && isoctal(*(s+3))) {
			*t++ = ((*(s+1) - '0') << 6) +
			       ((*(s+2) - '0') << 3) +
			       ((*(s+3) - '0')     );
			s += 3;
		} else
			*t++ = *s;
	} while (*s++ != '\0');

	return str;
}
