Path: utzoo!attcan!uunet!husc6!cmcl2!adm!smoke!gwyn
From: gwyn@smoke.BRL.MIL (Doug Gwyn )
Newsgroups: comp.lang.c
Subject: Re: What is wrong?
Message-ID: <9492@smoke.BRL.MIL>
Date: 24 Jan 89 21:40:10 GMT
References: <2051@ndsuvax.UUCP>
Reply-To: gwyn@brl.arpa (Doug Gwyn (VLD/VMB) <gwyn>)
Organization: Ballistic Research Lab (BRL), APG, MD.
Lines: 11

In article <2051@ndsuvax.UUCP> numork@ndsuvax.UUCP (James Mork) writes:
-    j=putc(i,fi);
-  a simple program like this, the file gets truncated after 25 or
-  26 bytes...    After 25 when I read the file back in, I just
-  get EOF (-1).  What is wrong?

Sounds to me like a ^Z in a text stream is taken as an EOF indicator.
I know CP/M had this misfeature; maybe PC-DOS does too.

You probably should have been using binary streams instead.
I.e. fopen with mode "wb" or "rb".