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C routine that compares debian package versions

Hello debian users,

I'm currently writing a small program in C that is supposed to
show me which packages I have from woody and which ones from
sid (my system is actually a mix of both of them).
Now, a problem I am likely to encounter soon are the version
numbers. Do the follow some kind of scheme?

For instance, package ssh
ssh 1:1.2.3-9.3

If I had the version string saved somewhere, and an other
one like 1:1.2.3-9.4, how can I compare them, is there a
function that can do this?

Alex Suzuki_________________________________.
:: Email:      asuzuki@bluewin.ch           ¦
:: WWW:        http://www.cynox.ch          ¦
:: Linux shop: http://www.cynox.ch/isoshop/ ¦

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