iosdata.h

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#ifndef _RWSTD_IOSDATA_H_INCLUDED
#define _RWSTD_IOSDATA_H_INCLUDED
 
 
#include <string.h>
 
#include <rw/_iosbase.h>
#include <rw/_defs.h>
 
 
_RWSTD_NAMESPACE (std) {
 
// POD-type
struct ios_base::_C_usr_data
{
    struct _C_event_cb {
        int                      _C_index;
        ios_base::event_callback _C_fn;
    };
 
    typedef void (ios_base::*_C_fire_fun)(ios_base::event, bool);
 
    // allocates a 0-initialized chunk of storage
    static _C_usr_data* _C_alloc (_C_fire_fun);
    static void _C_dealloc (_C_usr_data*);
 
    void         *_C_tie;       // tied stream object
    long         *_C_iarray;    // user long data
    void*        *_C_parray;    // user void* data
    _C_event_cb  *_C_cbarray;   // array of user-registered callbacks
    _RWSTD_SIZE_T _C_isize;     // size of _C_iarray in elements
    _RWSTD_SIZE_T _C_psize;     // size of _C_parray in elements
    _RWSTD_SIZE_T _C_cbsize;    // size of _C_cbarray in elements
 
    // set to point to ios_base::_C_fire_event, used to eliminate
    // the dependency of the translation unit that defines common
    // ios_base members on the one that defines rarely used ones
    _C_fire_fun _C_fire;
 
    static _C_usr_data _C_std_usr_data [2];
};
 
 
inline /* static */ ios_base::_C_usr_data*
ios_base::_C_usr_data::_C_alloc (_C_fire_fun pfire)
{
    _TRY {
        // rely on 0-initialization of PODs
        _C_usr_data* const pdata = new _C_usr_data ();
 
#ifdef _RWSTD_NO_NEW_THROWS
 
        if (!pdata)
            return 0;
 
#endif   // _RWSTD_NO_NEW_THROWS
 
        _RWSTD_ASSERT (0 != pdata);
 
#ifndef _RWSTD_NO_POD_ZERO_INIT
 
        // assert that the POD ctor above zeroed out all members
        _RWSTD_ASSERT (!pdata->_C_tie);
        _RWSTD_ASSERT (!pdata->_C_iarray);
        _RWSTD_ASSERT (!pdata->_C_parray);
        _RWSTD_ASSERT (!pdata->_C_cbarray);
        _RWSTD_ASSERT (!pdata->_C_isize);
        _RWSTD_ASSERT (!pdata->_C_psize);
        _RWSTD_ASSERT (!pdata->_C_cbsize);
 
#else   // if defined (_RWSTD_NO_POD_ZERO_INIT)
 
        memset (pdata, 0, sizeof *pdata);
 
#endif   // _RWSTD_NO_POD_ZERO_INIT
 
        pdata->_C_fire = pfire;
 
        return pdata;
    }
    _CATCH (...) {
        return 0;
    }
}
 
 
inline /* static */ void
ios_base::_C_usr_data::_C_dealloc (_C_usr_data *ptr)
{
    if (ptr) {
        operator delete (ptr->_C_iarray);
        operator delete (ptr->_C_parray);
        operator delete (ptr->_C_cbarray);
 
        if (   ptr != _C_usr_data::_C_std_usr_data
            && ptr != _C_usr_data::_C_std_usr_data + 1)
            delete ptr;
    }
}
 
 
}   // namespace std
 
 
#endif   // _RWSTD_IOSDATA_H_INCLUDED