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Date: Thu, 02 May 2002 07:12:26 +0300
From: "Eli Zaretskii" <eliz AT is DOT elta DOT co DOT il>
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To: djgpp AT delorie DOT com
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In-reply-to: <aapgkv$im1$1@reader05.wxs.nl> (jansb000@planet.nl)
Subject: Re: how to determine if a file is text/binary
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> From: "jansb000" <jansb000 AT planet DOT nl>
> Newsgroups: comp.os.msdos.djgpp
> Date: Wed, 1 May 2002 21:45:36 +0200
> 
> If all data that you read is between Hex 20 and Hex 7F (with exception for
> Hex 0D or Hex 0D 0A) then there is a good chance the file is ASCII.

This method will say that, e.g., Info files are binary, which I'm not
sure is what you want.  Files with non-ASCII characters (those with
the 8th bit set) will also appear as binary, which is only good if
you are in the US.

In my experience, the test for null characters has proven itself as
the most reliable one, believe me.