Article View: comp.os.msdos.programmer
Article #3570Re: fread-inf >= 64K in Borland C++
From: fred smith
Date: Tue, 10 Nov 1992 19:33
Date: Tue, 10 Nov 1992 19:33
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1443 bytes
Bill Denton (AD) (bill@sees.bangor.ac.uk) wrote: : When I try to fread 64K or more in Borland C the PC locks up. This occurs with : all memory models and with version 2.0 and 3.0. Is this serious bug fixed in : version 3.1 ? How do I fix it, without the obvious, but unsatisifactory, solution of reading the data in chunks smaller the 64K ? : This is NOT A BUG (unless you're generating 32-bit 386 or 486 code, that is!). On MS-DOS systems the processor is run in real mode in which mode all int's are 16-bit quantities. The biggest number you can store in an int is (2**32)-1, or 65535, or 64k-1. Therefore the biggest chunk of data that can be moved in an i/o operation is 64k, since all the low-level functions use an int to tell 'em how many bytes to move. It's a FEATURE (of sorts). : Bill Denton : bill@sees.bangor.ac.uk : School of Electronic Engineering and Computer Science : University of Wales, Bangor : UK : :
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arc1-ca.pugleaf.net!sparky!uunet!noc.near.net!hri.com!ukma!gatech!destroyer!caen!batcomputer!cornell!rochester!cantaloupe.srv.cs.cmu.edu!das-news.harvard.edu!spdcc!merk!fcshome!fredexReferences:
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Path: arc1-ca.pugleaf.net!sparky!uunet!noc.near.net!hri.com!ukma!gatech!destroyer!caen!batcomputer!cornell!rochester!cantaloupe.srv.cs.cmu.edu!das-news.harvard.edu!spdcc!merk!fcshome!fredex From: fredex@fcshome.UUCP (fred smith) Newsgroups: comp.os.msdos.programmer Subject: Re: fread-inf >= 64K in Borland C++ Message-ID: <921109150@fcshome.UUCP> Date: 10 Nov 92 19:33:57 GMT References: <1992Nov9.095508@sees.bangor.ac.uk> Organization: What?!? Absolutely none! Lines: 22 X-Newsreader: Tin 1.1 PL5