[Mingw-notify] [ mingw-Bugs-1171379 ] ifstream.eof() reports false EOF

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Bugs item #1171379, was opened at 2005-03-27 15:36
Message generated for change (Comment added) made by ahaferburg
You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=102435&aid=1171379&group_id=2435

Category: mingw runtime
Group: None
Status: Open
Resolution: None
Priority: 5
Submitted By: Laszlo Keresztfalvi (kereszt)
Assigned to: Nobody/Anonymous (nobody)
Summary: ifstream.eof() reports false EOF

Initial Comment:
System:
WinXP Professional, Version 2002, SP1
MinGW-3.1.0-1
MSYS-1.0.10
gcc-core-3.4.2-20040916-1
gcc-g++-3.4.2-20040916-1

IF a text file larger than 512 bytes containing DOS
line breaks opened for reading in text mode (no
ios::binary set) AND ifstream.read() set to read mode
than 511 bytes THEN  the ifstream.eof() returns TRUE
after the first read! Although, the real number of
bytes read is smaller than the requested (I think
because of translation of line ends)  but the file is
not on EOF!

I found this when my program using 2048 bytes buffer to
read a text file failed to load the whole file.

#include <fstream>
using namespace std;

#define	BS		512

int main (void)
{	char buf [BS+1];
	
	ifstream f ("some.txt");
	while (!f.eof ())
	{
		f.read (buf, BS);
		int r = f.gcount ();
		buf [r] = 0;
		
		fprintf (stderr, "%d %d: %s\n", f.eof (), r, buf);
	}
	
	return 0;
}


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Comment By: A. Haferburg (ahaferburg)
Date: 2005-04-04 15:14

Message:
Logged In: YES 
user_id=1246682

I ran into this bug, too. I'm using MinGW-3.2.0-rc-
3.exe on Windows 2000 sp 4.

Best regards
Andreas

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