programfromstdin.cc

来自「这个程序是关于OpenC＋＋的反射植入机制的编译器」· CC 代码 · 共 97 行

//@beginlicenses@
//@license{chiba_tokyo}{}@
//@license{xerox}{}@
//@license{contributors}{}@
//
//  Permission to use, copy, distribute and modify this software and its  
//  documentation for any purpose is hereby granted without fee, provided that
//  the above copyright notice appears in all copies and that both that copyright
//  notice and this permission notice appear in supporting documentation.
// 
//  1997-2001 Shigeru Chiba, Tokyo Institute of Technology. make(s) no representations about the suitability of this
//  software for any purpose. It is provided "as is" without express or implied
//  warranty.
//  
//  Copyright (C)  1997-2001 Shigeru Chiba, Tokyo Institute of Technology.
//
//  -----------------------------------------------------------------
//
//
//  Copyright (c) 1995, 1996 Xerox Corporation.
//  All Rights Reserved.
//
//  Use and copying of this software and preparation of derivative works
//  based upon this software are permitted. Any copy of this software or
//  of any derivative work must include the above copyright notice of   
//  Xerox Corporation, this paragraph and the one after it.  Any
//  distribution of this software or derivative works must comply with all
//  applicable United States export control laws.
//
//  This software is made available AS IS, and XEROX CORPORATION DISCLAIMS
//  ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION THE  
//  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR    
//  PURPOSE, AND NOTWITHSTANDING ANY OTHER PROVISION CONTAINED HEREIN, ANY
//  LIABILITY FOR DAMAGES RESULTING FROM THE SOFTWARE OR ITS USE IS
//  EXPRECSLY DISCLAIMED, WHETHER ARISING IN CONTRACT, TORT (INCLUDING
//  NEGLIGENCE) OR STRICT LIABILITY, EVEN IF XEROX CORPORATION IS ADVISED
//  OF THE POSSIBILITY OF SUCH DAMAGES.
//
//  -----------------------------------------------------------------
//
//  Permission to use, copy, distribute and modify this software and its  
//  documentation for any purpose is hereby granted without fee, provided that
//  the above copyright notice appears in all copies and that both that copyright
//  notice and this permission notice appear in supporting documentation.
// 
//  Other Contributors (see file AUTHORS) make(s) no representations about the suitability of this
//  software for any purpose. It is provided "as is" without express or implied
//  warranty.
//  
//  Copyright (C)  Other Contributors (see file AUTHORS)
//
//@endlicenses@

#include <iostream>
#include <opencxx/parser/ProgramFromStdin.h>

namespace Opencxx
{

ProgramFromStdin::ProgramFromStdin()
: Program("stdin")
{
    const int Size = 1024 * 1024; // :FIXME: 
    buf = new char[Size];
    buf_size = Size;
    index = size = 0;
}

ProgramFromStdin::~ProgramFromStdin()
{
    delete [] buf;
    buf = 0;
}

char ProgramFromStdin::Get()
{
    if(size >= buf_size){
	std::cerr << "ProgramFromStdin: sorry, out of memory\n";
	exit(1);
    }

    if(index >= size){
	int c = std::cin.get();
	if(c == EOF)
	    c = '\0';

	buf[size++] = c;
    }

    if(buf[index] == '\0')
	return buf[index];
    else
	return buf[index++];
}

}