get_env_len(char_u **arg)
{
    char_u	*p;
    int		len;

    for (p = *arg; vim_isIDc(*p); ++p)
	;
    if (p == *arg)	    // no name found
	return 0;

    len = (int)(p - *arg);
    *arg = p;
    return len;
}
get_env_len(char_u **arg)
{
    char_u	*p;
    int		len;

    for (p = *arg; vim_isIDc(*p); ++p)
	;
    if (p == *arg)	     
	return 0;

    len = (int)(p - *arg);
    *arg = p;
    return len;
}