[STDCXX-522] std::filebuf::overflow(EOF) writes EOF to file in unbuffered mode

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 4.1.3, 4.1.4
• Fix Version/s: 4.2.0
• Component/s: 27. Input/Output
• Assignee: Martin Sebor
• Reporter: Martin Sebor
• Created: 15/Aug/07 01:42
• Updated: 05/Sep/07 22:02
• Resolved: 29/Aug/07 19:30

Description

The program below should run successfully to completion but instead it aborts (both in 4.1.3 and on trunk):

$ cat t.cpp && make t && LD_LIBRARY_PATH=../lib ./t
#include <cassert>
#include <fstream>
#include <ios>

int main ()
{
struct: std::filebuf {
int_type overflow (int_type c)

{ return std::filebuf::overflow (c); }

} buf;

buf.open ("file", std::ios::out);
buf.pubsetbuf (0, 0);
buf.overflow (std::filebuf::traits_type::eof ());
buf.close ();

std::ifstream in ("file");
assert (std::istream::traits_type::eof () == in.get ());
}
gcc -c -I/amd/devco/sebor/stdcxx-4.1.3/include/ansi -D_RWSTDDEBUG -pthread -D_RWSTD_USE_CONFIG -I/build/sebor/stdcxx-4.1.3-gcc-3.4.3_6-15D/include -I/amd/devco/sebor/stdcxx-4.1.3/include -I/amd/devco/sebor/stdcxx-4.1.3/examples/include -pedantic -nostdinc++ -g -m64 -Wall -W -Wcast-qual -Winline -Wshadow -Wwrite-strings -Wno-long-long -Wcast-align t.cpp
gcc t.o -o t -pthread -m64 -L/build/sebor/stdcxx-4.1.3-gcc-3.4.3_6-15D/lib -lstd15D -lsupc++ -lm
t: t.cpp:19: int main(): Assertion `std::istream::traits_type::eof () == in.get ()' failed.
Aborted

Issue Links

• duplicates: STDCXX-204 std::filebuf::overflow(EOF) writes garbage in unbuffered mode