#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>

int main(int argc, char *argv[])
{ int c, b=0;
  FILE *fp;
# ifdef O_BINARY
  setmode(1,O_BINARY);
# endif
  if (argc == 1) {
    fp = stdin;
# ifdef O_BINARY
    setmode(0,O_BINARY);
# endif
  } else if ((fp=fopen(argv[1],"rb")) == NULL) {
    fprintf(stderr, "file %s not found\n", argv[1]); exit(1);
  }
  while ((c=getc(fp)) != EOF) {
    if (c == '\r') { putchar('\r'); putchar('\n'); }
    else if (c == '\n')
      { if (b != '\r') { putchar('\r'); putchar('\n'); } }
    else putchar(c);
    b = c;
  }
  fclose(fp); fclose(stdout);
  return(0);
}