in source/jobs.c [128:152]
static bool_ isValidID( const char * id,
                        uint16_t length,
                        uint16_t max,
                        bool_ allowColon )
{
    bool_ ret = false;
    if( ( id != NULL ) && ( length > 0U ) &&
        ( length <= max ) )
    {
        size_t i;
        for( i = 0; i < length; i++ )
        {
            if( isValidChar( id[ i ], allowColon ) == false )
            {
                break;
            }
        }
        ret = ( i == length ) ? true : false;
    }
    return ret;
}