Path: utzoo!utgpu!news-server.csri.toronto.edu!clyde.concordia.ca!uunet!optilink!cramer
From: cramer@optilink.UUCP (Clayton Cramer)
Newsgroups: comp.os.msdos.programmer
Subject: Re: Help.  End of Diskette VS EOF
Message-ID: <4164@optilink.UUCP>
Date: 10 Aug 90 23:47:29 GMT
References: <1990Aug9.004845.16663@sun.soe.clarkson.edu>
Organization: Optilink Corporation, Petaluma, CA
Lines: 74

In article <1990Aug9.004845.16663@sun.soe.clarkson.edu>, levericw@clutx.clarkson.edu (Allanon) writes:
> I would like to know if a C program will return different error codes if
> it reaches the end of a file or reaches the end of a diskette, are these
> two things the same or can I tell them apart.

I don't believe that there's any difference, as far as something
like fwrite cares.

> If anyone has an established, or just working, way to save files across
> volumes I would like to know, please E-Mail me.  I will post summary if
> there is enough interest.

> Walden H. Leverich III               | Inet: levericw@clutx.clarkson.edu

#include <stdio.h>
#include <malloc.h>
#include "std.h"

main(Argc, Argv)

int		Argc;
char*	Argv[];

	{
	long		BytesThisPartFile;
	long		BytesPerPart;
	int			PartNbr;
	char		OutFileName[40];
	FILE*		OutFile;
	FILE*		FileToPart;
	char*		Bytes;
	bool		MoreBytes = TRUE;
	int			BytesRead;
	
	FileToPart = fopen(Argv[1], "rb");
	sscanf(Argv[3], "%ld", &BytesPerPart);
	BytesPerPart *= 1000L;
	Bytes = malloc(1000);
	if((Bytes) && (FileToPart))
		{
		PartNbr = 0;
		sprintf(OutFileName, Argv[2], PartNbr);
		fprintf(stderr, "creating %s\n", OutFileName);
		BytesThisPartFile = 0L;
		OutFile = fopen(OutFileName, "wb");
		if(OutFile)
			{
			while(MoreBytes)
				{
				BytesRead = fread(Bytes, sizeof(char), sizeof(Bytes), 
								  FileToPart);
				fwrite(Bytes, sizeof(char), BytesRead, OutFile);
				BytesThisPartFile += sizeof(Bytes);
				if(feof(FileToPart))
					MoreBytes = FALSE;
				else if(BytesThisPartFile >= BytesPerPart)
					{
					PartNbr++;
					fclose(OutFile);
					sprintf(OutFileName, Argv[2], PartNbr);
					fprintf(stderr, "creating %s\n", OutFileName);
					BytesThisPartFile = 0L;
					OutFile = fopen(OutFileName, "wb");
					}
				}
			}
		fclose(OutFile);
		}
	}
-- 
Clayton E. Cramer {pyramid,pixar,tekbspa}!optilink!cramer
"Our Constitution is color-blind.  The arbitrary separation of citizens,
on the basis of race... is a badge of servitude wholly inconsistent with
civil freedom." -- Justice John Marshall Harlan (1896)