ioscoeio.cpp

来自「开放源码的编译器open watcom 1.6.0版的源代码」· C++ 代码 · 共 86 行

/****************************************************************************
*
*                            Open Watcom Project
*
*    Portions Copyright (c) 1983-2002 Sybase, Inc. All Rights Reserved.
*
*  ========================================================================
*
*    This file contains Original Code and/or Modifications of Original
*    Code as defined in and that are subject to the Sybase Open Watcom
*    Public License version 1.0 (the 'License'). You may not use this file
*    except in compliance with the License. BY USING THIS FILE YOU AGREE TO
*    ALL TERMS AND CONDITIONS OF THE LICENSE. A copy of the License is
*    provided with the Original Code and Modifications, and is also
*    available at www.sybase.com/developer/opensource.
*
*    The Original Code and all software distributed under the License are
*    distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
*    EXPRESS OR IMPLIED, AND SYBASE AND ALL CONTRIBUTORS HEREBY DISCLAIM
*    ALL SUCH WARRANTIES, INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF
*    MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR
*    NON-INFRINGEMENT. Please see the License for the specific language
*    governing rights and limitations under the License.
*
*  ========================================================================
*
* Description:
*
****************************************************************************/

#ifdef __SW_FH
#include "iost.h"
#else
#include "variety.h"
#include <iostream>
#endif
#include "ioutil.h"
#include "lock.h"

namespace std {

  // Construct an "ios" and initialize it. New "ios" gets all fields of
  // "is" except streambuf.

  ios &ios::operator = ( const ios &is ) {

    __lock_it( __lock_first( __i_lock, is.__i_lock ) );
    __lock_it( __lock_second( __i_lock, is.__i_lock ) );
    __lock_it( __x_lock );
    __error_state        = is.__error_state;
    __format_flags       = is.__format_flags;
    __enabled_exceptions = is.__enabled_exceptions;
    __float_precision    = is.__float_precision;
    __field_width        = is.__field_width;
    __fill_character     = is.__fill_character;
    __tied_stream        = is.__tied_stream;


    // copy over the xalloc vector
    if( __xalloc_index > 0 ) {
        // make sure that 'this' has enough entries in it
        (void)__WATCOM_ios::find_user_word( this, __xalloc_index-1 );

        int index = 0;
        ios_word_values *src_word;
        src_word = (ios_word_values *)is.__xalloc_list;
        for( ; src_word != NULL; src_word = src_word->next ) {
            ipvalue *src, *tgt;
            for( int i = 0 ; i < src_word->count ; i++ ) {
                src = (ipvalue *)&(src_word->values[i]);
                tgt = (ipvalue *)__WATCOM_ios::find_user_word( this, index );
                if( tgt == NULL ) {
                    setstate( ios:: failbit );
                    return( *this );
                }
                *tgt = *src;
                index++;
            }
        }
    }
    return( *this );
  }

}