bool CScript::IsPushOnly(const_iterator pc) const
{
    while (pc < end())
    {
        opcodetype opcode;
        if (!GetOp(pc, opcode))
            return false;
        // Note that IsPushOnly() *does* consider OP_RESERVED to be a
        // push-type opcode, however execution of OP_RESERVED fails, so
        // it's not relevant to P2SH/BIP62 as the scriptSig would fail prior to
        // the P2SH special validation code being executed.
        if (opcode > OP_16)
            return false;
    }
    return true;
}