toadcrlf - add CR before NL

toadcrlf.c

#include <stdio.h>

int main(void)
{
  int c;
  while(1) {
    c = getchar();
    if(c == EOF) {
      break;
    }
    if(c == '\n') {
      putchar('\r');
    }
    putchar(c);
  }
  return 0;
}