def xxx_isprint(jitter):
    """
    #include <ctype.h>
    int isprint(int c);

    checks for any printable character including space.
    """
    ret_addr, args = jitter.func_args_systemv(['c'])
    ret = 1 if 32 <= args.c & 255 < 127 else 0
    return jitter.func_ret_systemv(ret_addr, ret)
