Path: utzoo!attcan!uunet!snorkelwacker!apple!gateway.qm.apple.com!sean_parent.snarkmail_l_z
From: sean_parent.snarkmail_l_z@gateway.qm.apple.com (Sean Parent)
Newsgroups: comp.sys.mac.programmer
Subject: Re: simple C Problem
Message-ID: <10630@goofy.Apple.COM>
Date: 9 Oct 90 18:28:19 GMT
References: <1268@beguine.UUCP>
Sender: usenet@Apple.COM
Organization: Apple Computer, Inc.
Lines: 30

In article <1268@beguine.UUCP> Eliot.Henry@samba.acs.unc.edu (BBS Account) 
writes:
>  I have a routine I wrote in pascal that reads and writes blocks from
> a floppy drive. The problem is that when I converted it to C it doesn't
> work. Yes, strange but true. It gives an error -50 every so often then
> consistantly has trouble reading the next 65 or 66 sectors (there is a 
loop
> that is writing to the entire disk) This is probably an embaressingly 
simple
> problem. Any help would be greatly appreciated here is the code I have:
> 
In article <1268@beguine.UUCP> Eliot.Henry@samba.acs.unc.edu (BBS Account) 
writes:
> 
> char                    thebuffer[512];
>  
In article <1268@beguine.UUCP> Eliot.Henry@samba.acs.unc.edu (BBS Account) 
writes:
> 
> /* Load the array with 0 bits (ascii character zero) */
> for (i=1; i<=512; i++) 
>         thebuffer[i]=0;

This is a commen problem with pascal programers converting to C. thebuffer 
is an array containing 512 items but is indexed form 0 to 511. The for 
loop here will write off the end of the array.


Sean Parent
"Quality unattainable in a reasonable amount of time."