[gnutls-devel] GnuTLS | Sockets: implement sendmsg()-like function on Win32 (!1377)

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Evgeny Grin commented on a discussion on lib/system/sockets.c: https://gitlab.com/gnutls/gnutls/-/merge_requests/1377#note_509556788

> +			bufs[to_send_cnt].buf = iovec[to_send_cnt].iov_base;
> +			bufs[to_send_cnt].len = (unsigned long)
> +					(space_left > ULONG_MAX ?
> +						ULONG_MAX : space_left);
> +			ovrflwn = true;
> +		}
> +		else if (iovec[to_send_cnt].iov_len > ULONG_MAX) {
> +			bufs[to_send_cnt].buf = iovec[to_send_cnt].iov_base;
> +			bufs[to_send_cnt].len = ULONG_MAX;
> +			ovrflwn = true;
> +		}
> +		else {
> +			bufs[to_send_cnt].buf = iovec[to_send_cnt].iov_base;
> +			bufs[to_send_cnt].len =
> +				(unsigned long) iovec[to_send_cnt].iov_len;
> +			to_send_bytes += iovec[to_send_cnt].iov_len;

`WSASend()` can send more than `SSIZE_MAX` on x32 Windows. The problem is GnuTLS will unable to process this value, as return value could be negative when casted to `ssize_t`.

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