# Source code for M2Crypto.Err

    """M2Crypto wrapper for OpenSSL Error API.

    Copyright (c) 1999-2003 Ng Pheng Siong. All rights reserved."""

    from M2Crypto import BIO, m2, util  # noqa
    from typing import Optional  # noqa

    def get_error() -> Optional[str]:
        err = BIO.MemoryBuffer()
        m2.err_print_errors(err.bio_ptr())
        err_msg = err.read()
        if err_msg:
            return err_msg.decode()
        return None

    def get_error_code() -> int:
        return m2.err_get_error()

    def peek_error_code() -> int:
        return m2.err_peek_error()

    def get_error_lib(err: Optional[int]) -> str:
        if err is None:
            return ""
        err_str = m2.err_lib_error_string(err)
        return err_str if err_str else ""

    def get_error_func(err: Optional[int]) -> str:
        if err is None:
            return ""
        err_str = m2.err_func_error_string(err)
        return err_str if err_str else ""

    def get_error_reason(err: Optional[int]) -> str:
        if err is None:
            return ""
        err_str = m2.err_reason_error_string(err)
        return err_str if err_str else ""

    def get_error_message() -> str:
        return get_error_reason(get_error_code())

    def get_x509_verify_error(err: Optional[int]) -> str:
        if err is None:
            return ""
        err_str = m2.x509_get_verify_error(err)
        return err_str if err_str else ""

    class SSLError(Exception):
        def __init__(self, err: int, client_addr: util.AddrType) -> None:
            self.err = err
            self.client_addr = client_addr

        def __str__(self) -> str:
            if not isinstance(self.client_addr, str):
                s = (
                    self.client_addr
                    if isinstance(self.client_addr, str)
                    else str(self.client_addr)
                )
            else:
                s = self.client_addr
            return "%s: %s: %s" % (
                get_error_func(self.err),
                s,
                get_error_reason(self.err),
            )

    class M2CryptoError(Exception):
        pass