Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!convex!mic!letni!utacfd!merch!cpe!hal6000!trsvax!don
From: don@trsvax.UUCP
Newsgroups: comp.lang.c
Subject: Re: <4203@csusac.csus.edu>
Message-ID: <50400006@trsvax>
Date: 21 May 91 18:31:33 GMT
References: <4203@csusac.csus.edu>
Lines: 33
Nf-ID: #R:csusac.csus.edu:4203:trsvax:50400006:000:870
Nf-From: trsvax.UUCP!don    May  6 14:19:00 1991


>Suppose I have a 100-byte file called "myfile.dat", and I want to get
>rid of the last 10 bytes.  The only way that I can figure out how to do
>this is with something like the following:

>main()
>{
>	char buf[100];
>	FILE *fp;
>	fp = fopen("myfile.dat", "r");
>	fread(buf, 1, 100, fp);
>	fclose(fp);
>	fp = fopen("myfile.dat", "w");
>	fwrite(buf, 1, 90, fp);
>	fclose(fp);
>}

This does not necessarily truncate files in all operating systems.  To
correctly truncate the file using ANSI calls, add the line

	remove("myfile.dat");

after the first call to fclose().

---------------------------------------------------------------------------

I wouldn't bring up Paris if I were you.  It's poor salesmanship.
					-- Casablanca

Don Subt			The opinions expressed above are
Tandy Corp.			strictly mine, not my employer's.

817-390-2923			don%trsvax@rwsys.lonestar.org