[Bug c++/14653] New: Semantics of ifstream.bad have changed from gcc 2.95.3 to gcc 3.2.3

[Bug c++/14653] New: Semantics of ifstream.bad have changed from gcc 2.95.3 to gcc 3.2.3

[saunak dot chakrabarti at gs dot com]

Linux egnoq01pb01.ny.eq.gs.com 2.4.18-19bigmem #1 SMP Thu Feb 27 14:21:17 EST 
2003 i686

In the test program below, the ifstream is not 'bad' when the associated file 
does not exist.  In gcc 2.95.3, this was not the case.  What was the reason for 
changing the semantics of ifstream.bad()?  Of note, ifstream.fail() detects 
when a file does not exist in both cases.

#include <iostream.h>
#include <fstream.h>

int main()
{
    ifstream routerIn( "/home/salesoma/router.config");

    if ( routerIn.bad() )
    {
        cerr << "Problem!" << endl;
    }
    else
        cerr << "No Problem " << endl;

    return 0;
}

Gcc 2.95.3 says Problem!
But GCC 3.2.3 says NoProblem!

-- 
           Summary: Semantics of ifstream.bad have changed from gcc 2.95.3
                    to gcc 3.2.3
           Product: gcc
           Version: 3.2.3
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: saunak dot chakrabarti at gs dot com
                CC: gcc-bugs at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=14653

[Bug libstdc++/14653] Semantics of ifstream.bad have changed from gcc 2.95.3 to gcc 3.2.3

[pinskia at gcc dot gnu dot org]

------- Additional Comments From pinskia at gcc dot gnu dot org  2004-03-19 15:52 -------
The bad function is not correct in this situtiation:
>From the C++ standard, 27.4.2.1.3:
badbit indicates a loss of integrity in an input or output sequence (such as an irrecoverable read error 
from a file); 

eofbit indicates that an input operation reached the end of an input sequence; 

failbit indicates that an input operation failed to read the expected characters, or that an output 
operation failed to generate the desired characters.

Looks like fail is what is needed here.

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
          Component|c++                         |libstdc++
         Resolution|                            |INVALID


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=14653

[Bug libstdc++/14653] Semantics of ifstream.bad have changed from gcc 2.95.3 to gcc 3.2.3

[pinskia at gcc dot gnu dot org]

------- Additional Comments From pinskia at gcc dot gnu dot org  2004-03-19 15:53 -------
oh by the way fail works you expected.

-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=14653