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Path: utzoo!utgpu!water!watmath!clyde!cbatt!ihnp4!ihuxy!nowlin
From: nowlin@ihuxy.UUCP
Newsgroups: comp.sys.atari.st
Subject: Megamax Binary Files
Message-ID: <1971@ihuxy.ATT.COM>
Date: Thu, 14-May-87 14:21:40 EDT
Article-I.D.: ihuxy.1971
Posted: Thu May 14 14:21:40 1987
Date-Received: Sat, 16-May-87 09:48:53 EDT
Organization: AT&T Bell Laboratories - Naperville, Illinois
Lines: 45
Keywords: read writes, binary files


I've noticed a problem with Megamax and reading binary files.  The
following code is used to copy one file to another.  It works fine except
that the file being copied, the one being read, gets one byte longer after
every copy.

	if ((in = fopen(old,"br")) == NULL) {
		fprintf(stderr,"ERROR: can't open '%s' to read\n",old);
		return 0;
	}

	if ((out = fopen(new,"bw")) == NULL) {
		fprintf(stderr,"ERROR: can't open '%s' to write\n",new);
		fclose(in);
		return 0;
	}

	setbuf(in,ibuf);
	setbuf(out,obuf);

	while ((len = fread(buff,1,CPBLEN,in)) > 0) {
		if (fwrite(buff,1,len,out) != len) {
			fprintf(stderr,"ERROR: write error on '%s'\n",new);
			ret = 0;
			break;
		}
	}

	if (fclose(in) < 0) {
		fprintf(stderr,"ERROR: close error on '%s'\n",old);
		ret = 0;
	}

	if (fclose(out) < 0) {
		fprintf(stderr,"ERROR: close error on '%s'\n",new);
		ret = 0;
	}

I can't think of any reason why a file opened for read would get longer
after it was read all the way to the end.  Has anyone else run into this
problem and found a way to fix it?  Thanks for any help that can be
offered.  I really like Megamax but this is strange.

Jerry Nowlin
(...!ihnp4!ihuxy!nowlin)