/*
   GetChars - This is a simple program to dump keycodes for keypresses
   Copyright (C) 2004 Frank Sorenson (frank@tuxrocks.com)

   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.

   Compiling: g++ GetChars.cpp -o GetChars
*/

#include <stdio.h>
#include <stdlib.h>
#include <termios.h>
#include <unistd.h>
#include <signal.h>

int SetTerminalSettings(int Port, int Reset = 0)
{
  static struct termios OldTermios;
  struct termios NewTermios;

  if (Reset == 1)
  {
    NewTermios = OldTermios;
  }
  else
  {
    if (tcgetattr(Port, &OldTermios) < 0) return -1;
    NewTermios = OldTermios;
    NewTermios.c_lflag &= ~(ECHO | ICANON | IEXTEN | ISIG);
    NewTermios.c_iflag &= ~(BRKINT | ICRNL | INPCK | ISTRIP | IXON);
    NewTermios.c_cc[VMIN] = 1;
    NewTermios.c_cc[VTIME] = 0;
  }

  if (tcsetattr(Port, TCSAFLUSH, &NewTermios) < 0) return -1;
  return 0;
}

void CatchSig(int sig)
{
  SetTerminalSettings(0, 1);
  exit(0);
}

int InputWaiting(int Port)
{
  fd_set rsel;
  int MaxFDs = 32;
  int Result;
  struct timeval tv;

  tv.tv_sec = 0;
  tv.tv_usec = 0;
  FD_ZERO(&rsel);
  FD_SET(Port, &rsel);
  Result = select(MaxFDs, &rsel, NULL, NULL, &tv);
  if (!Result) return 0;
  if (FD_ISSET(Port, &rsel) == 0) return 0;
  return 1;
}

void SetupSignals()
{
  if ((int) signal(SIGINT, CatchSig) < 0)
  {
    perror("signal");
    exit(1);
  }
  if ((int) signal(SIGQUIT, CatchSig) < 0)
  {
    perror("signal");
    exit(1);
  }
  if ((int) signal(SIGTERM, CatchSig) < 0)
  {
    perror("signal");
    exit(1);
  }
}

int ReadChar(int Port)
{
  int Result;
  unsigned char InputChar;

  Result = read(0, &InputChar, 1);
  if (Result != 1) return -1;
  return InputChar;
}

int main(int argc, char *argv[])
{
  int InputChar;

  SetupSignals();
  SetTerminalSettings(0);

  while (1)
  {
    InputChar = ReadChar(0);

    if (InputChar < 0) break;
    if (InputChar == 0x03) break; /* Control-C */

    printf("0x%02X", InputChar);
    if (InputChar == 0x1B)
    {
      while (InputWaiting(0))
      {
        InputChar = ReadChar(0);
        if (InputChar < 0) break;
        printf(" 0x%02X", InputChar);
      }
    }
    printf("\n");
  }
}