xstring_insert.h

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// xstring_insert.h internal header
// Copyright (c) Microsoft Corporation. All rights reserved.
#pragma once
#ifndef _XSTRING_INSERT_H
#define _XSTRING_INSERT_H
#ifndef RC_INVOKED

#include <ostream>

#pragma pack(push,_CRT_PACKING)
#pragma warning(push,_STL_WARNING_LEVEL)
#pragma warning(disable: _STL_DISABLED_WARNINGS)
#pragma push_macro("new")
#undef new

_STD_BEGIN

template<class _Elem,
    class _Traits,
    class _SizeT> inline
    basic_ostream<_Elem, _Traits>& _Insert_string(
        basic_ostream<_Elem, _Traits>& _Ostr,
        const _Elem * const _Data, const _SizeT _Size)
    {   // insert a character-type sequence into _Ostr as if through a basic_string copy
    ios_base::iostate _State = ios_base::goodbit;
    _SizeT _Pad = _Ostr.width() <= 0 || static_cast<_SizeT>(_Ostr.width()) <= _Size
        ? 0 : static_cast<_SizeT>(_Ostr.width()) - _Size;
    const typename basic_ostream<_Elem, _Traits>::sentry _Ok(_Ostr);

    if (!_Ok)
        _State |= ios_base::badbit;
    else
        {   // state okay, insert characters
        _TRY_IO_BEGIN
        if ((_Ostr.flags() & ios_base::adjustfield) != ios_base::left)
            for (; 0 < _Pad; --_Pad)    // pad on left
                if (_Traits::eq_int_type(_Traits::eof(),
                    _Ostr.rdbuf()->sputc(_Ostr.fill())))
                    {   // insertion failed, quit
                    _State |= ios_base::badbit;
                    break;
                    }

        if (_State == ios_base::goodbit
            && _Ostr.rdbuf()->sputn(_Data, (streamsize)_Size)
                != (streamsize)_Size)
                _State |= ios_base::badbit;
        else
            for (; 0 < _Pad; --_Pad)    // pad on right
                if (_Traits::eq_int_type(_Traits::eof(),
                    _Ostr.rdbuf()->sputc(_Ostr.fill())))
                    {   // insertion failed, quit
                    _State |= ios_base::badbit;
                    break;
                    }
        _Ostr.width(0);
        _CATCH_IO_(_Ostr)
        }

    _Ostr.setstate(_State);
    return (_Ostr);
    }

_STD_END

#pragma pop_macro("new")
#pragma warning(pop)
#pragma pack(pop)
#endif /* RC_INVOKED */
#endif /* _XSTRING_INSERT_H */