Comment 29 for bug 20215

* Sven Mueller:

> +/* Read the minimum value and do a paranoid check: a negative value indicates
> +an integer overflow. */
> +
> while ((digitab[*p] & ctype_digit) != 0) min = min * 10 + *p++ - '0';
> +if (min < 0 || min > 65535)

This doesn't work. Signed integer overflow is undefined. Future GCC
version are likely to detect that the "min < 0" test is superfluous as
a result, and will optimize it away.