readchar

/*
 *  call-seq:
 *     ios.readchar   => fixnum
 *  
 *  Reads a character as with <code>IO#getc</code>, but raises an
 *  <code>EOFError</code> on end of file.
 */

static VALUE
rb_io_readchar(io)
    VALUE io;
{
    VALUE c = rb_io_getc(io);

    if (NIL_P(c)) {
        rb_eof_error();
    }
    return c;
}