do
while (1)
__argz_stringify (char *argz, size_t len, int sep){  if (len > 0)    do      {	size_t part_len = strnlen (argz, len);	argz += part_len;	len -= part_len;	if (len == 0)	  break;	*argz++ = sep;      }    while (--len > 0);}