test/src/AddChecksum.cpp

   1 /* Copyright_License {
   2
   3   XCSoar Glide Computer - http://www.xcsoar.org/
   4   Copyright (C) 2000-2013 The XCSoar Project
   5   A detailed list of copyright holders can be found in the file "AUTHORS".
   6
   7   This program is free software; you can redistribute it and/or
   8   modify it under the terms of the GNU General Public License
   9   as published by the Free Software Foundation; either version 2
  10   of the License, or (at your option) any later version.
  11
  12   This program is distributed in the hope that it will be useful,
  13   but WITHOUT ANY WARRANTY; without even the implied warranty of
  14   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15   GNU General Public License for more details.
  16
  17   You should have received a copy of the GNU General Public License
  18   along with this program; if not, write to the Free Software
  19   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  20 }
  21 */
  22
  23 /*
  24  * Reads input from stdin, calculates the NMEA checksum, and prints
  25  * the lines with a correct checksum to stdout.
  26  *
  27  */
  28
  29 #include "NMEA/Checksum.hpp"
  30
  31 #include <stdio.h>
  32 #include <string.h>
  33
  34 int
  35 main(int argc, char **argv)
  36 {
  37   char buffer[1024];
  38
  39   const char *start = buffer;
  40   while ((start = fgets(buffer, sizeof(buffer) - 3, stdin)) != NULL) {
  41     const char *end = strchr(start, '*');
  42     if (end == NULL) {
  43       end = start + strlen(start);
  44       while (end > start && (end[-1] == '\n' || end[-1] == '\r'))
  45         --end;
  46     }
  47
  48     printf("%.*s*%02x\n", (int)(end - buffer), buffer,
  49            NMEAChecksum(start, end - start));
  50   }
  51
  52   return 0;
  53 }