[Bug libstdc++/28103] New: std::operator<<(ostream&, string) sets badbit instead of failbit on failure

[sebor at roguewave dot com]

21.3.7.9, p4 requires the operator to set failbit, not badbit, on failure. This
came up while I was gathering background for c++std-lib-17241.

$ cat ~/tmp/t.cpp && g++ ~/tmp/t.cpp -static && ./a.out 
#include <cassert>
#include <cstdio>
#include <string>
#include <strstream>

int main ()
{
    char buf [3];

    std::ostrstream os (buf, sizeof (buf));

    os << std::string ("1234");

    std::printf ("state = %c%c%c (expected --?)\n",
                 os.rdstate () & os.badbit ? 'B' : '-',
                 os.rdstate () & os.eofbit ? 'E' : '-',
                 os.rdstate () & os.failbit ? 'F' : '-');

    std::fflush (stdout);

    assert (!(os.rdstate () & os.badbit));
}

In file included from
/usr/local/gcc-4.1.0/lib/gcc/sparc-sun-solaris2.9/4.1.0/../../../../include/c++/4.1.0/backward/strstream:51,
                 from /nfs/b20/sebor/tmp/t.cpp:4:
/usr/local/gcc-4.1.0/lib/gcc/sparc-sun-solaris2.9/4.1.0/../../../../include/c++/4.1.0/backward/backward_warning.h:32:2:
warning: #warning This file includes at least one deprecated or antiquated
header. Please consider using one of the 32 headers found in section 17.4.1.2
of the C++ standard. Examples include substituting the <X> header for the <X.h>
header for C++ includes, or <iostream> instead of the deprecated header
<iostream.h>. To disable this warning use -Wno-deprecated.
state = B-- (expected --?)
Assertion failed: !(os.rdstate () & os.badbit), file /nfs/b20/sebor/tmp/t.cpp,
line 21
Abort (core dumped)


-- 
           Summary: std::operator<<(ostream&, string) sets badbit instead of
                    failbit on failure
           Product: gcc
           Version: 4.1.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: libstdc++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: sebor at roguewave dot com
 GCC build triplet: all
  GCC host triplet: all
GCC target triplet: all


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=28103