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From "Martin Sebor (JIRA)" <j...@apache.org>
Subject [jira] Created: (STDCXX-161) filebuf::sgetn() fails after sputn() in stdio mode
Date Sat, 04 Mar 2006 00:40:39 GMT
filebuf::sgetn() fails after sputn() in stdio mode
--------------------------------------------------

         Key: STDCXX-161
         URL: http://issues.apache.org/jira/browse/STDCXX-161
     Project: C++ Standard Library
        Type: Bug
  Components: 27. Input/Output  
    Versions: 4.1.3    
 Environment: all
    Reporter: Martin Sebor
 Assigned to: Martin Sebor 
    Priority: Critical
     Fix For: 4.1.4


The program below fails at runtime (std::ios::stdio is an extension of this implementation
that forces the filebuf to use the stdio facilities for I/O instead of OS native calls).

$ cat t.cpp && gmake t && ./t
#include <fstream>
#include <cassert>

int main ()
{
    std::filebuf fb;

    assert (0 != fb.open ("testfile.text", std::ios::out));
    assert (6 == fb.sputn ("ABCDEF", 6));
    assert (0 != fb.close ());

    assert (0 != fb.open ("testfile.text",
                          std::ios::in | std::ios::out | std::ios::stdio));

    assert (3 == fb.sputn ("abc", 3));
    assert (-1 != fb.pubsync ());

    char buf [3] = "";
    assert (3 == fb.sgetn (buf, sizeof buf));
    assert (0 == std::filebuf::traits_type::compare ("DEF", buf, 3));
}
aCC -c -I/build/sebor/dev/stdlib/include/ansi -I/usr/include  -D_RWSTDDEBUG   -mt -D_RWSTD_USE_CONFIG
-I/build/sebor/aCC-3.63-15s/include -I/build/sebor/dev/stdlib/include -I/build/sebor/dev/stdlib/../rwtest
-I/build/sebor/dev/stdlib/../rwtest/include -I/build/sebor/dev/stdlib/tests/include  -Aa +nostl
 -g +d  +w +W392 +W655 +W684 +W818 +W819 +W849  t.cpp
aCC t.o -o t -L/build/sebor/aCC-3.63-15s/rwtest -lrwtest15s -Aa +nostl -Wl,+s -Wl,+vnocompatwarnings
-L/build/sebor/aCC-3.63-15s/lib   -mt -L/build/sebor/aCC-3.63-15s/lib -lstd15s   -lm
Assertion failed: 0 == std::filebuf::traits_type::compare ("DEF", buf, 3), file t.cpp, line
20
ABORT instruction (core dumped)

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