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From: ronald@atcmp.nl (Ronald Pikkert)
Newsgroups: comp.lang.c
Subject: Re: B-Trees in C Data Structures -help-
Message-ID: <611@atcmpe.atcmp.nl>
Date: 3 Jun 90 12:28:51 GMT
References: <8790001@hpislx.HP.COM>
Organization: AT Computing, Nijmegen, The Netherlands
Lines: 27

From article <8790001@hpislx.HP.COM>, by notes@hpislx.HP.COM (Notesfiles System):
> I have a B-tree program that works up to the first split but when it needs 
> to split again it goes into a recursive loop.  I've looked and looked at the 
> code and it seems ok logically???Stumped???
> 
> 
> short getpage()
> {
> 	long lseek(), addr;
> 	addr = lseek(btfd, 0L, 2) - 2L;
> 	return((short) addr / PAGESIZE);
> }
> 

Your problem is in the page calculation routine. The addr is first converted
into a short and then divided by PAGESIZE.
Change this line into:

 	return((short) (addr / PAGESIZE));

Don't worry, it's only a pair of brackets on a lot of code :-)

-
Ronald Pikkert                 E-mail: ronald@atcmp.nl
@ AT Computing b.v.            Tel:    080 - 566880
Toernooiveld
6525 ED  Nijmegen