/*---------------------------------------------------------------- *\
   file: consolekeyloop.c 
 author: mathias gumz
  start: 031204 16:45:33 
  about: shows how to read keypress from stdin without waiting
         til the final enter comes...
\*---------------------------------------------------------------- */ 


#include <stdio.h>
#include <unistd.h>
#include <time.h>
#include <string.h>
#include <sys/select.h>
#include <sys/time.h>
#include <sys/types.h>
#include <termios.h>

struct timeval  tv;
int             retval;
fd_set          rfds;
char            buf;

static struct termios new_termios;
static struct termios old_termios;


void quietterm()
{
  tcgetattr(fileno(stdin), &old_termios);
  new_termios = old_termios;
        new_termios.c_iflag &= ~(ISTRIP|IXON|IXOFF);
        new_termios.c_lflag &= ~(ICANON|ISIG|IEXTEN|ECHO);
        new_termios.c_cc[VMIN] = 1;
        new_termios.c_cc[VTIME] = 0;
        tcsetattr(0, TCSANOW, &new_termios);

  return; 
}

void resetterm()
{
  tcsetattr(0, TCSANOW, &old_termios);
  return;
}

int main()
{
  FD_ZERO(&rfds);
  FD_SET(fileno(stdin), &rfds);

  quietterm();

  tv.tv_sec= 1;
  tv.tv_usec= 0;

  while(1)
  {
    FD_SET(fileno(stdin), &rfds);
    retval= pselect(1, &rfds, NULL, NULL, &tv, NULL);
    if ( retval > 0)
    {
      read(0, &buf, 1); 
      switch(buf)
      {
        case 'q':
          resetterm();
          printf("exit\n");
          exit(0);
          break;

        default:
          printf("pressed: %d\r", (int)buf);
          fflush(stdout);
          break;
      }
    }
    else if ( retval == 0 )
      printf("nothing pressed %d\n", retval);
    else
      printf("error\n");

    fflush(stdin);
  };

  resetterm();
  return 0;
}