vim_isxdigit(int c)
{
    return (c >= '0' && c <= '9')
	|| (c >= 'a' && c <= 'f')
	|| (c >= 'A' && c <= 'F');
}
vim_isxdigit(int c)
{
    return (c >= '0' && c <= '9')
	|| (c >= 'a' && c <= 'f')
	|| (c >= 'A' && c <= 'F');
}