chfile.h

来自「开放源码的编译器open watcom 1.6.0版的源代码」· C头文件 代码 · 共 138 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
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*    MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR
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*  ========================================================================
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* Description:  WHEN YOU FIGURE OUT WHAT THIS FILE DOES, PLEASE
*               DESCRIBE IT HERE!
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****************************************************************************/


#ifndef __CHFILE_H__

#include <string.hpp>
#include <unistd.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <wstd.h>

// FileExcept -- indicate that an exceptional file condition has occured

class FileExcept {
public:
    enum Action {
        Open,
        Close,
        Read,
        Write,
        Seek,
        Tell,
        Stat,
    };

                    FileExcept( Action act, int error, const char * fn,
                                const char * msg = NULL );
                    #if 0   // avoid compiler error 28
                    ~FileExcept();
                    #endif

    Action          _action;
    int             _error;     // errno
    char *          _fileName;
    char *          _message;   // possibly from strerror
};

//
// CheckedFile  provides low-level file access with error handling.  If
//              an error is detected, a CheckedFileExcept is thrown.
//              File opens are buffered, so if open fails on out of file
//              handles, an open file is closed and open tries again.
//

template <class Type> class WCPtrOrderedVector;

class CheckedFile {
public:
    enum Access {
        ReadBinary =    O_RDONLY | O_BINARY,
        ReadText =      O_RDONLY | O_TEXT,
        WriteBinary =   O_WRONLY | O_BINARY | O_CREAT | O_TRUNC,
        WriteText =     O_WRONLY | O_TEXT   | O_CREAT | O_TRUNC,
    };

    enum Permission {
        UserReadWrite = S_IRUSR | S_IWUSR,
    };

                    CheckedFile( const char * fileName );
    virtual         ~CheckedFile();

    virtual void    open( int access, int permission );
            void    close();    // no exceptions

    virtual int     read( void * buffer, int len );
    virtual void    write( const void * buffer, int len );
            void    puts( const char * str );
    virtual long    seek( long offset, int whence );
    virtual long    tell() const;

            int     readNString( String & );
            int     writeNString( String & );

            bool    operator== ( const CheckedFile& other ) const {  // for WCvector
                        return( this == &other );
                    }

            int     fstat( struct stat * buf );
            time_t  st_mtime();
            off_t   st_size();

    const   char *  getFileName() const { return _fileName; }
            void    setFileName( const char * fn );


protected:
    virtual void    reOpen();
    virtual void    privClose();

            char *  _fileName;

            int     _openAccess;            // access permission for open
            int     _openPermission;        // permission for open with write

            int     _handle;                // handle of the posix file
            long    _currOffset;            // current physical offset within the file
            bool    _isOpen;                // true if file physically open
            bool    _logOpen;               // true if logically open (user didn't close)

    static  WCPtrOrderedVector<CheckedFile> *   _openFiles;
};

extern char * BadWhenceMessage;

#define __CHFILE_H__
#endif