error_windows.c

void myperror(const char *msg) {
    char *wsa_message = NULL;
    FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM,
            NULL,
            WSAGetLastError(),
            MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
            (LPSTR)&wsa_message,
            0,
            NULL);
    printf("%s : %s\n", msg, wsa_message);
    LocalFree(wsa_message);
}