Function GetEnvVar

Source/ThirdParty/tracy/common/TracySystem.cpp:316–346

}

TRACY_API const char* GetEnvVar( const char* name )
{
#if defined _WIN32
    // unfortunately getenv() on Windows is just fundamentally broken.  It caches the entire
    // environment block once on startup, then never refreshes it again.  If any environment
    // strings are added or modified after startup of the CRT, those changes will not be
    // seen by getenv().  This removes the possibility of an app using this SDK from
    // programmatically setting any of the behaviour controlling envvars here.
    //
    // To work around this, we'll instead go directly to the Win32 environment strings APIs
    // to get the current value.
    static char buffer[1024];
    DWORD const kBufferSize = DWORD(sizeof(buffer) / sizeof(buffer[0]));
    DWORD count = GetEnvironmentVariableA(name, buffer, kBufferSize);

    if( count == 0 )
        return nullptr;

    if( count >= kBufferSize )
    {
        char* buf = reinterpret_cast<char*>(_alloca(count + 1));
        count = GetEnvironmentVariableA(name, buf, count + 1);
        memcpy(buffer, buf, kBufferSize);
        buffer[kBufferSize - 1] = 0;
    }

    return buffer;
#else
    return getenv(name);
#endif
}

}