192 lines
5.1 KiB
C
192 lines
5.1 KiB
C
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/***
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*streamb.h - definitions/declarations for the streambuf class
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*
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* Copyright (c) 1990-2001, Microsoft Corporation. All rights reserved.
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*
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*Purpose:
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* This file defines the classes, values, macros, and functions
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* used by the streambuf class.
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* [AT&T C++]
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*
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* [Public]
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*
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****/
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#if _MSC_VER > 1000
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#pragma once
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#endif
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#ifdef __cplusplus
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#ifndef _INC_STREAMB
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#define _INC_STREAMB
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#if !defined(_WIN32)
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#error ERROR: Only Win32 target supported!
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#endif
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#ifdef _MSC_VER
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// Currently, all MS C compilers for Win32 platforms default to 8 byte
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// alignment.
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#pragma pack(push,8)
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#include <useoldio.h>
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#endif // _MSC_VER
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/* Define _CRTIMP */
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#ifndef _CRTIMP
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#ifdef _DLL
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#define _CRTIMP __declspec(dllimport)
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#else /* ndef _DLL */
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#define _CRTIMP
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#endif /* _DLL */
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#endif /* _CRTIMP */
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#include <ios.h> // need ios::seek_dir definition
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#ifndef NULL
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#define NULL 0
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#endif
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#ifndef EOF
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#define EOF (-1)
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#endif
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#ifdef _MSC_VER
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// C4514: "unreferenced inline function has been removed"
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#pragma warning(disable:4514) // disable C4514 warning
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// #pragma warning(default:4514) // use this to reenable, if desired
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#endif // _MSC_VER
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typedef long streampos, streamoff;
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class _CRTIMP ios;
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class _CRTIMP streambuf {
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public:
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virtual ~streambuf();
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inline int in_avail() const;
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inline int out_waiting() const;
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int sgetc();
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int snextc();
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int sbumpc();
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void stossc();
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inline int sputbackc(char);
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inline int sputc(int);
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inline int sputn(const char *,int);
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inline int sgetn(char *,int);
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virtual int sync();
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virtual streambuf* setbuf(char *, int);
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virtual streampos seekoff(streamoff,ios::seek_dir,int =ios::in|ios::out);
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virtual streampos seekpos(streampos,int =ios::in|ios::out);
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virtual int xsputn(const char *,int);
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virtual int xsgetn(char *,int);
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virtual int overflow(int =EOF) = 0; // pure virtual function
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virtual int underflow() = 0; // pure virtual function
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virtual int pbackfail(int);
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void dbp();
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#ifdef _MT
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void setlock() { LockFlg--; } // <0 indicates lock required;
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void clrlock() { if (LockFlg <= 0) LockFlg++; }
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void lock() { if (LockFlg<0) _mtlock(lockptr()); };
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void unlock() { if (LockFlg<0) _mtunlock(lockptr()); }
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#else
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void lock() { }
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void unlock() { }
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#endif
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protected:
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streambuf();
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streambuf(char *,int);
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inline char * base() const;
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inline char * ebuf() const;
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inline char * pbase() const;
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inline char * pptr() const;
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inline char * epptr() const;
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inline char * eback() const;
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inline char * gptr() const;
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inline char * egptr() const;
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inline int blen() const;
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inline void setp(char *,char *);
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inline void setg(char *,char *,char *);
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inline void pbump(int);
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inline void gbump(int);
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void setb(char *,char *,int =0);
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inline int unbuffered() const;
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inline void unbuffered(int);
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int allocate();
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virtual int doallocate();
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#ifdef _MT
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_PCRT_CRITICAL_SECTION lockptr() { return & x_lock; }
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#endif
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private:
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int _fAlloc;
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int _fUnbuf;
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int x_lastc;
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char * _base;
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char * _ebuf;
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char * _pbase;
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char * _pptr;
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char * _epptr;
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char * _eback;
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char * _gptr;
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char * _egptr;
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#ifdef _MT
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int LockFlg; // <0 indicates locking required
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_CRT_CRITICAL_SECTION x_lock; // lock needed only for multi-thread operation
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#endif
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};
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inline int streambuf::in_avail() const { return (gptr()<_egptr) ? (int)(_egptr-gptr()) : 0; }
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inline int streambuf::out_waiting() const { return (_pptr>=_pbase) ? (int)(_pptr-_pbase) : 0; }
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inline int streambuf::sputbackc(char _c){ return (_eback<gptr()) ? *(--_gptr)=_c : pbackfail(_c); }
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inline int streambuf::sputc(int _i){ return (_pptr<_epptr) ? (unsigned char)(*(_pptr++)=(char)_i) : overflow(_i); }
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inline int streambuf::sputn(const char * _str,int _n) { return xsputn(_str, _n); }
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inline int streambuf::sgetn(char * _str,int _n) { return xsgetn(_str, _n); }
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inline char * streambuf::base() const { return _base; }
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inline char * streambuf::ebuf() const { return _ebuf; }
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inline int streambuf::blen() const {return ((_ebuf > _base) ? (int)(_ebuf-_base) : 0); }
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inline char * streambuf::pbase() const { return _pbase; }
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inline char * streambuf::pptr() const { return _pptr; }
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inline char * streambuf::epptr() const { return _epptr; }
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inline char * streambuf::eback() const { return _eback; }
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inline char * streambuf::gptr() const { return _gptr; }
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inline char * streambuf::egptr() const { return _egptr; }
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inline void streambuf::gbump(int _n) { if (_egptr) _gptr += _n; }
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inline void streambuf::pbump(int _n) { if (_epptr) _pptr += _n; }
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inline void streambuf::setg(char * _eb, char * _g, char * _eg) {_eback=_eb; _gptr=_g; _egptr=_eg; x_lastc=EOF; }
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inline void streambuf::setp(char * _p, char * _ep) {_pptr=_pbase=_p; _epptr=_ep; }
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inline int streambuf::unbuffered() const { return _fUnbuf; }
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inline void streambuf::unbuffered(int _f) { _fUnbuf = _f; }
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#ifdef _MSC_VER
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// Restore previous packing
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#pragma pack(pop)
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#endif // _MSC_VER
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#endif // _INC_STREAMB
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#endif /* __cplusplus */
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