ssfoverf.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 70 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
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*    except in compliance with the License. BY USING THIS FILE YOU AGREE TO
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*    provided with the Original Code and Modifications, and is also
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* Description:
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****************************************************************************/

#ifdef __SW_FH
#include "iost.h"
#else
#include "variety.h"
#include <strstrea>
#endif

namespace std {

  // The streambuf level has decided that its buffer is too small for
  // the characters that the user is trying to put. Allocate a new
  // (bigger) buffer, and append 'c' if it's not EOF.

  int strstreambuf::overflow( int c ) {
    __lock_it( __b_lock );
    if( !__dynamic ) {
        return( EOF );
    }
    if( __unlimited ) {
        // adjust end pointer
        int offset = out_waiting();
        setp( pbase(), epptr() + DEFAULT_MAINBUF_SIZE );
        pbump( offset );
        return( __NOT_EOF );
    }

    // Use doallocate() because streambuf::allocate() will not grow an
    // existing buffer the way strstreambuf needs to
    if( doallocate() == EOF ) {
        return( EOF );
    }
    if( c != EOF ) {
        *pptr() = (char)c;
        pbump( 1 );
    }
    return( __NOT_EOF );
  }

}