e84823c8d6
Checking if it is > 0 doesn't make sense, because snprintf returns how much space is needed if the buffer is too small. Instead, check if the return value was greater than the buffer size, and truncate the message if it was too long. It isn't clear if snprintf can return a negative value in the case of an error - I don't believe it can. If it can, then testing v->iov_len won't help 'cos it is a size_t, not an ssize_t. Also, as clang points out, we must always increment v here, because later code depends on the message being in iov[5].
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