simulating the ftruncate() function in C under xenix

[Hi Ho Silver]

   I'm trying to compile a C program which uses the ftruncate() function;
however, Xenix (or at least the version here) doesn't have this function.
Can anyone point me towards how to simulate such a beastie?  I'd
appreciate email replies, since articles often tend to expire before
I get to see them.

advTHANXance!
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