/*
Copyright_License {

  XCSoar Glide Computer - http://www.xcsoar.org/
  Copyright (C) 2000-2015 The XCSoar Project
  A detailed list of copyright holders can be found in the file "AUTHORS".

  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 2
  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, write to the Free Software
  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
}
*/

#include "EscapeBackslash.hpp"

#include <string.h>

TCHAR *
UnescapeBackslash(const TCHAR* old_string)
{
  TCHAR buffer[2048]; // Note - max size of any string we cope with here !

  unsigned int used = 0;

  for (unsigned int i = 0; i < _tcslen(old_string); i++) {
    if (used < 2045) {
      if (old_string[i] == '\\') {
        if (old_string[i + 1] == 'r') {
          buffer[used++] = '\r';
          i++;
        } else if (old_string[i + 1] == 'n') {
          buffer[used++] = '\n';
          i++;
        } else if (old_string[i + 1] == '\\') {
          buffer[used++] = '\\';
          i++;
        } else {
          buffer[used++] = old_string[i];
        }
      } else {
        buffer[used++] = old_string[i];
      }
    }
  }

  buffer[used++] = _T('\0');

  return _tcsdup(buffer);
}
