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//////////////////////////////////////////////////////////////////////////////
//
// (C) Copyright Ion Gaztanaga 2006-2012. Distributed under the Boost
// Software License, Version 1.0. (See accompanying file
// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
// See http://www.boost.org/libs/interprocess for documentation.
//
//////////////////////////////////////////////////////////////////////////////
#include <boost/interprocess/detail/workaround.hpp>
//[doc_bufferstream
#include <boost/interprocess/managed_shared_memory.hpp>
#include <boost/interprocess/streams/bufferstream.hpp>
#include <vector>
#include <iterator>
#include <cstddef>
//<-
#include "../test/get_process_id_name.hpp"
//->
using namespace boost::interprocess;
int main ()
{
//Remove shared memory on construction and destruction
struct shm_remove
{
shm_remove() { shared_memory_object::remove(test::get_process_id_name()); }
~shm_remove(){ shared_memory_object::remove(test::get_process_id_name()); }
} remover;
//<-
(void)remover;
//->
//Create shared memory
managed_shared_memory segment(create_only,test::get_process_id_name(), 65536);
//Fill data
std::vector<int> data;
data.reserve(100);
for(std::size_t i = 0; i < 100; ++i){
data.push_back((int)i);
}
const std::size_t BufferSize = 100*5;
//Allocate a buffer in shared memory to write data
char *my_cstring =
segment.construct<char>("MyCString")[BufferSize]('\0');
bufferstream mybufstream(my_cstring, BufferSize);
//Now write data to the buffer
for(std::size_t i = 0; i < 100; ++i){
mybufstream << data[i] << std::endl;
}
//Check there was no overflow attempt
assert(mybufstream.good());
//Extract all values from the shared memory string
//directly to a vector.
std::vector<int> data2;
std::istream_iterator<int> it(mybufstream), itend;
std::copy(it, itend, std::back_inserter(data2));
//This extraction should have ended will fail error since
//the numbers formatted in the buffer end before the end
//of the buffer. (Otherwise it would trigger eofbit)
assert(mybufstream.fail());
//Compare data
assert(std::equal(data.begin(), data.end(), data2.begin()));
//Clear errors and rewind
mybufstream.clear();
mybufstream.seekp(0, std::ios::beg);
//Now write again the data trying to do a buffer overflow
for(std::size_t i = 0, m = data.size()*5; i < m; ++i){
mybufstream << data[i%5u] << std::endl;
}
//Now make sure badbit is active
//which means overflow attempt.
assert(!mybufstream.good());
assert(mybufstream.bad());
segment.destroy_ptr(my_cstring);
return 0;
}
//]
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