AntiDebug LIB Function Reference
GJ_isdigit GJ_islower GJ_isupper GJ_isprint GJ_isspace

Syntx

        int GJ_isdigit(int ch)

        int GJ_islower(int ch)

        int GJ_isupper(int ch)

        int GJ_isprint(int ch)

        int GJ_isspace(int ch)

    GJ_isdigit is compatible with Run-Time Library function isdigit. 
    GJ_islower is compatible with Run-Time Library function islower.
    GJ_isupper is compatible with Run-Time Library function isupper. 
    GJ_isprint is compatible with Run-Time Library function isprint.
    GJ_isspace is compatible with Run-Time Library function isspace. 

    The more information please to reference MSDN Library.