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Signed Integer Network and Host Conversion

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I would like to convert a int32_t from host byte order to network byte order and vice versa. I know about the htonl() function and its variants, but this takes unsigned integers. Is there a standard library function which can do the same with signed integers or do I have to implement it myself? And if I have to implement it myself, how should I do it?

I'm looking to find a routine that will work on Linux and Mac OS X.