beginning_of_line?

/*
 * Returns +true+ iff the scan pointer is at the beginning of the line.
 *
 *   s = StringScanner.new("test\ntest\n")
 *   s.bol?           # => true
 *   s.scan(/te/)
 *   s.bol?           # => false
 *   s.scan(/st\n/)
 *   s.bol?           # => true
 *   s.terminate
 *   s.bol?           # => true
 */
static VALUE
strscan_bol_p(VALUE self)
{
    struct strscanner *p;

    GET_SCANNER(self, p);
    if (CURPTR(p) > S_PEND(p)) return Qnil;
    if (p->curr == 0) return Qtrue;
    return (*(CURPTR(p) - 1) == '\n') ? Qtrue : Qfalse;
}