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From: Lewis Hyatt <lhyatt AT princeton DOT edu>
Subject:  Re: can't read sequential files
Date:  Thu, 01 Nov 2007 18:24:32 -0400
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>   Hang on, I misread you, my eye skipped over the bit where you suggest that
> adding the check somehow makes the preceding fopen call succeed instead of
> fail.  However I still don't think that's what the OP was saying, unless the
> subject line of this thread is terribly wrong, I think you just read a bit too
> much into OP's phrase "everything worked"; I think that just means "program
> ran to completion /without/ a segfault".


It was more than that:

 >and then rebuilding the code, everything worked. But it's strange that
 >if I delete that code segment and never check whether the fp pointer is
 >NULL or not, I always get a segmentation fault. Can this be some kind
 >of an optimization problem? I don't know why it happens. Thank you for
 >the comments.

Especially when he suggested it was a problem with the compiler 
optimizer, I am pretty sure that he means the code is working as 
expected with this check in there, and he doesn't understand why. (The 
subject line applies from back before he tried this.)

But anyway you could be right too, I guess there's no point in guessing 
what he meant...

-Lewis


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