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

extern int errno;

struct termios oldsettings;

void reset_terminal()
{ tcsetattr(0, TCSANOW, & oldsettings);
  printf("\nterminal reset\n"); }

void control_c(int x)
{ printf("\r\ncontrol-c\r\n");
  exit(0); }

void cprint_clearly(char c)
{ if (c<' ' || c>'~' || c=='[' || c==']' || c=='"')
    printf("[%d]", c);
  else
    printf("%c", c);
  if (c==4) exit(0); }

void print_clearly(char * s)
{ int i;
  for (i=0; 1; i+=1)
    if (s[i] == 0)
      break;
    else
      cprint_clearly(s[i]); }

int main()
{ tcgetattr(0, & oldsettings);
  signal(SIGINT, control_c);
  atexit(reset_terminal);

  struct termios info;
  tcgetattr(0, & info);
  info.c_lflag &= ~ ECHO;
  info.c_lflag &= ~ ICANON;
  info.c_cc[VMIN] = 1;
  info.c_cc[VTIME] = 0;
  tcsetattr(0, TCSAFLUSH, & info);

  while (1)
  { char line[1000];
    int r = read(0, line, 999);
    if (r<0)
    { if (errno == EAGAIN)
      { usleep(10000);
        continue; }
      fprintf(stderr, "errno is %d\n", errno);
      perror("read"); }
    else if (r==0)
      printf("nothing!\n");
    else
    { line[r] = 0;
      printf("got \"");
      print_clearly(line);
      printf("\"\n", line); }
  }
}