src/RadioFrequency.cpp

   1 /*
   2 Copyright_License {
   3
   4   XCSoar Glide Computer - http://www.xcsoar.org/
   5   Copyright (C) 2000-2013 The XCSoar Project
   6   A detailed list of copyright holders can be found in the file "AUTHORS".
   7
   8   This program is free software; you can redistribute it and/or
   9   modify it under the terms of the GNU General Public License
  10   as published by the Free Software Foundation; either version 2
  11   of the License, or (at your option) any later version.
  12
  13   This program is distributed in the hope that it will be useful,
  14   but WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16   GNU General Public License for more details.
  17
  18   You should have received a copy of the GNU General Public License
  19   along with this program; if not, write to the Free Software
  20   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  21 }
  22 */
  23
  24 #include "RadioFrequency.hpp"
  25
  26 #include <stdio.h>
  27 #include <stdlib.h>
  28
  29 TCHAR *
  30 RadioFrequency::Format(TCHAR *buffer, size_t max_size) const
  31 {
  32   if (!IsDefined())
  33     return NULL;
  34
  35   unsigned khz = GetKiloHertz();
  36   unsigned mhz = khz / 1000;
  37   khz %= 1000;
  38
  39   _sntprintf(buffer, max_size, _T("%u.%03u"), mhz, khz);
  40   return buffer;
  41 }
  42
  43 RadioFrequency
  44 RadioFrequency::Parse(const TCHAR *p)
  45 {
  46   TCHAR *endptr;
  47   double mhz = _tcstod(p, &endptr);
  48
  49   RadioFrequency frequency;
  50   if (mhz < 100 || *endptr != _T('\0'))
  51     frequency.Clear();
  52   else
  53     frequency.SetKiloHertz((unsigned)(mhz * 1000 + 0.5));
  54   return frequency;
  55 }