How Can I Create a Custom Stream Buffer in C for Direct Buffer Writing?

Custom Stream Buffer for Internal Buffer Management

Problem:

In C I/O streams, the pubsetbuf() method is not fully implemented in certain implementations. This limits the ability to write stream contents directly to a given buffer.

Solution:

To overcome this limitation, create a custom stream buffer class that initializes its internals to point to the desired buffer.

template <typename char_type>
struct ostreambuf : public std::basic_streambuf<char_type, std::char_traits<char_type>>
{
    ostreambuf(char_type* buffer, std::streamsize bufferLength)
    {
        setp(buffer, buffer + bufferLength);
    }
};

Application:

Use the custom stream buffer with I/O streams as follows:

char buffer[1024];

ostreambuf<char> ostreamBuffer(buffer, sizeof(buffer));
std::ostream messageStream(&ostreamBuffer);

messageStream << "Hello" << std::endl;
messageStream << "World!" << std::endl;

This solution allows stream contents to be written directly to the specified buffer, without incurring the overhead of unnecessary data copies.

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