rem: putchar (*(unsigned char *)s++);
add: putchar (*s++);
context: copy_rest (FILE *f, register int c){  register const char *s;  out_column = 0;  if (in_column > next_prefix_indent && c != '\n' && c != EOF)    {      put_space (next_prefix_indent);      for (s = prefix; out_column != in_column && *s; out_column++)	putchar (*(unsigned char *)s++);      put_space (in_column - out_column);    }  while (c != '\n' && c != EOF)    {      putchar (c);      c = getc (f);    }  return c;}