489 lines
16 KiB
C++
489 lines
16 KiB
C++
/* This is part of libio/iostream, providing -*- C++ -*- input/output.
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Copyright (C) 1993 Free Software Foundation
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This file is part of the GNU IO Library. This library is free
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software; you can redistribute it and/or modify it under the
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terms of the GNU General Public License as published by the
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Free Software Foundation; either version 2, or (at your option)
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any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this library; see the file COPYING. If not, write to the Free
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Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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As a special exception, if you link this library with files
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compiled with a GNU compiler to produce an executable, this does not cause
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the resulting executable to be covered by the GNU General Public License.
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This exception does not however invalidate any other reasons why
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the executable file might be covered by the GNU General Public License. */
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#ifndef _STREAMBUF_H
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#define _STREAMBUF_H
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#ifdef __GNUG__
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#pragma interface
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#endif
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/* #define _G_IO_THROW */ /* Not implemented: ios::failure */
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#define _IO_NEW_STREAMS // new optimizated stream representation
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extern "C" {
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#include <libio.h>
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}
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//#include <_G_config.h>
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#ifdef _G_NEED_STDARG_H
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#include <stdarg.h>
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#endif
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#ifndef _IO_va_list
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#define _IO_va_list char *
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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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#ifndef NULL
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#ifdef __GNUG__
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#define NULL (__null)
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#else
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#define NULL (0)
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#endif
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#endif
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#ifndef _IO_wchar_t
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#if _G_IO_IO_FILE_VERSION == 0x20001
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#define _IO_wchar_t _G_wchar_t
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#else
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#define _IO_wchar_t short
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#endif
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#endif
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extern "C++" {
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class istream; /* Work-around for a g++ name mangling bug. Fixed in 2.6. */
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class ostream; class streambuf;
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// In case some header files defines these as macros.
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#undef open
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#undef close
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#if defined(_G_IO_IO_FILE_VERSION) && _G_IO_IO_FILE_VERSION == 0x20001
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typedef _IO_off64_t streamoff;
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typedef _IO_fpos64_t streampos;
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#else
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typedef _IO_off_t streamoff;
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typedef _IO_fpos_t streampos;
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#endif
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typedef _IO_ssize_t streamsize;
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typedef unsigned long __fmtflags;
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typedef unsigned char __iostate;
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struct _ios_fields
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{ // The data members of an ios.
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streambuf *_strbuf;
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ostream* _tie;
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int _width;
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__fmtflags _flags;
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_IO_wchar_t _fill;
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__iostate _state;
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__iostate _exceptions;
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int _precision;
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void *_arrays; /* Support for ios::iword and ios::pword. */
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};
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#define _IOS_GOOD 0
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#define _IOS_EOF 1
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#define _IOS_FAIL 2
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#define _IOS_BAD 4
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#define _IO_INPUT 1
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#define _IO_OUTPUT 2
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#define _IO_ATEND 4
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#define _IO_APPEND 8
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#define _IO_TRUNC 16
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#define _IO_NOCREATE 32
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#define _IO_NOREPLACE 64
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#define _IO_BIN 128
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#ifdef _STREAM_COMPAT
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enum state_value {
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_good = _IOS_GOOD,
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_eof = _IOS_EOF,
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_fail = _IOS_FAIL,
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_bad = _IOS_BAD };
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enum open_mode {
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input = _IO_INPUT,
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output = _IO_OUTPUT,
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atend = _IO_ATEND,
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append = _IO_APPEND };
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#endif
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class ios : public _ios_fields {
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ios& operator=(ios&); /* Not allowed! */
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ios (const ios&); /* Not allowed! */
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public:
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typedef __fmtflags fmtflags;
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typedef int iostate;
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typedef int openmode;
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typedef int streamsize;
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enum io_state {
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goodbit = _IOS_GOOD,
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eofbit = _IOS_EOF,
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failbit = _IOS_FAIL,
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badbit = _IOS_BAD };
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enum open_mode {
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in = _IO_INPUT,
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out = _IO_OUTPUT,
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ate = _IO_ATEND,
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app = _IO_APPEND,
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trunc = _IO_TRUNC,
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nocreate = _IO_NOCREATE,
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noreplace = _IO_NOREPLACE,
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bin = _IOS_BIN, // Deprecated - ANSI uses ios::binary.
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binary = _IOS_BIN };
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enum seek_dir { beg, cur, end};
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typedef enum seek_dir seekdir;
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// NOTE: If adding flags here, before to update ios::bitalloc().
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enum { skipws=_IO_SKIPWS,
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left=_IO_LEFT, right=_IO_RIGHT, internal=_IO_INTERNAL,
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dec=_IO_DEC, oct=_IO_OCT, hex=_IO_HEX,
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showbase=_IO_SHOWBASE, showpoint=_IO_SHOWPOINT,
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uppercase=_IO_UPPERCASE, showpos=_IO_SHOWPOS,
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scientific=_IO_SCIENTIFIC, fixed=_IO_FIXED,
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unitbuf=_IO_UNITBUF, stdio=_IO_STDIO
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#ifndef _IO_NEW_STREAMS
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, dont_close=_IO_DONT_CLOSE // Don't delete streambuf on stream destruction
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#endif
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};
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enum { // Masks.
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basefield=dec+oct+hex,
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floatfield = scientific+fixed,
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adjustfield = left+right+internal
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};
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#ifdef _IO_THROW
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class failure : public xmsg {
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ios* _stream;
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public:
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failure(ios* stream) { _stream = stream; }
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failure(string cause, ios* stream) { _stream = stream; }
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ios* rdios() const { return _stream; }
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};
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#endif
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ostream* tie() const { return _tie; }
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ostream* tie(ostream* val) { ostream* save=_tie; _tie=val; return save; }
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// Methods to change the format state.
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_IO_wchar_t fill() const { return _fill; }
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_IO_wchar_t fill(_IO_wchar_t newf)
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{_IO_wchar_t oldf = _fill; _fill = newf; return oldf;}
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fmtflags flags() const { return _flags; }
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fmtflags flags(fmtflags new_val) {
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fmtflags old_val = _flags; _flags = new_val; return old_val; }
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int precision() const { return _precision; }
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int precision(int newp) {
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unsigned short oldp = _precision; _precision = (unsigned short)newp;
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return oldp; }
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fmtflags setf(fmtflags val) {
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fmtflags oldbits = _flags;
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_flags |= val; return oldbits; }
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fmtflags setf(fmtflags val, fmtflags mask) {
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fmtflags oldbits = _flags;
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_flags = (_flags & ~mask) | (val & mask); return oldbits; }
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fmtflags unsetf(fmtflags mask) {
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fmtflags oldbits = _flags;
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_flags &= ~mask; return oldbits; }
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int width() const { return _width; }
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int width(int val) { int save = _width; _width = val; return save; }
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#ifdef _IO_THROW
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void _throw_failure() const { throw new ios::failure(this); }
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#else
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void _throw_failure() const { }
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#endif
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void clear(iostate state = 0) {
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_state = _strbuf ? state : state|badbit;
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if (_state & _exceptions) _throw_failure(); }
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void set(iostate flag) { _state |= flag;
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if (_state & _exceptions) _throw_failure(); }
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void setstate(iostate flag) { _state |= flag; // ANSI
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if (_state & _exceptions) _throw_failure(); }
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int good() const { return _state == 0; }
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int eof() const { return _state & ios::eofbit; }
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int fail() const { return _state & (ios::badbit|ios::failbit); }
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int bad() const { return _state & ios::badbit; }
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iostate rdstate() const { return _state; }
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operator void*() const { return fail() ? (void*)0 : (void*)(-1); }
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int operator!() const { return fail(); }
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iostate exceptions() const { return _exceptions; }
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void exceptions(iostate enable) {
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_exceptions = enable;
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if (_state & _exceptions) _throw_failure(); }
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streambuf* rdbuf() const { return _strbuf; }
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streambuf* rdbuf(streambuf *_s) {
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streambuf *_old = _strbuf; _strbuf = _s; clear (); return _old; }
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static int sync_with_stdio(int on);
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static void sync_with_stdio() { sync_with_stdio(1); }
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static fmtflags bitalloc();
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static int xalloc();
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void*& pword(int);
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void* pword(int) const;
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long& iword(int);
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long iword(int) const;
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#ifdef _STREAM_COMPAT
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void unset(state_value flag) { _state &= ~flag; }
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void close();
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int is_open();
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int readable();
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int writable();
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#endif
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// Used to initialize standard streams. Not needed in this implementation.
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class Init {
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public:
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Init () { }
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};
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protected:
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inline ios(streambuf* sb = 0, ostream* tie_to = 0);
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inline virtual ~ios();
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inline void init(streambuf* sb, ostream* tie = 0);
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};
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#if __GNUG__==1
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typedef int _seek_dir;
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#else
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typedef ios::seek_dir _seek_dir;
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#endif
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// Magic numbers and bits for the _flags field.
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// The magic numbers use the high-order bits of _flags;
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// the remaining bits are abailable for variable flags.
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// Note: The magic numbers must all be negative if stdio
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// emulation is desired.
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// A streammarker remembers a position in a buffer.
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// You are guaranteed to be able to seek back to it if it is saving().
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class streammarker : private _IO_marker {
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friend class streambuf;
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void set_offset(int offset) { _pos = offset; }
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public:
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streammarker(streambuf *sb);
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~streammarker();
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int saving() { return 1; }
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int delta(streammarker&);
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int delta();
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};
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struct streambuf : public _IO_FILE { // protected??
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friend class ios;
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friend class istream;
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friend class ostream;
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friend class streammarker;
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const void *&_vtable() { return *(const void**)((_IO_FILE*)this + 1); }
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protected:
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static streambuf* _list_all; /* List of open streambufs. */
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_IO_FILE*& xchain() { return _chain; }
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void _un_link();
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void _link_in();
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char* gptr() const
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{ return _IO_file_flags & _IO_IN_BACKUP ? _IO_save_base : _IO_read_ptr; }
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char* pptr() const { return _IO_write_ptr; }
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char* egptr() const
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{ return _IO_file_flags & _IO_IN_BACKUP ? _IO_save_end : _IO_read_end; }
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char* epptr() const { return _IO_write_end; }
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char* pbase() const { return _IO_write_base; }
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char* eback() const
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{ return _IO_file_flags & _IO_IN_BACKUP ? _IO_save_base : _IO_read_base;}
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char* base() const { return _IO_buf_base; }
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char* ebuf() const { return _IO_buf_end; }
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int blen() const { return _IO_buf_end - _IO_buf_base; }
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void xput_char(char c) { *_IO_write_ptr++ = c; }
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int xflags() { return _IO_file_flags; }
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int xflags(int f) {int fl = _IO_file_flags; _IO_file_flags = f; return fl;}
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void xsetflags(int f) { _IO_file_flags |= f; }
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void xsetflags(int f, int mask)
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{ _IO_file_flags = (_IO_file_flags & ~mask) | (f & mask); }
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void gbump(int n)
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{ _IO_file_flags & _IO_IN_BACKUP ? (_IO_save_base+=n):(_IO_read_ptr+=n);}
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void pbump(int n) { _IO_write_ptr += n; }
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void setb(char* b, char* eb, int a=0);
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void setp(char* p, char* ep)
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{ _IO_write_base=_IO_write_ptr=p; _IO_write_end=ep; }
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void setg(char* eb, char* g, char *eg) {
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if (_IO_file_flags & _IO_IN_BACKUP) _IO_free_backup_area(this);
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_IO_read_base = eb; _IO_read_ptr = g; _IO_read_end = eg; }
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char *shortbuf() { return _shortbuf; }
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int in_backup() { return _flags & _IO_IN_BACKUP; }
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// The start of the main get area: FIXME: wrong for write-mode filebuf?
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char *Gbase() { return in_backup() ? _IO_save_base : _IO_read_base; }
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// The end of the main get area:
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char *eGptr() { return in_backup() ? _IO_save_end : _IO_read_end; }
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// The start of the backup area:
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char *Bbase() { return in_backup() ? _IO_read_base : _IO_save_base; }
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char *Bptr() { return _IO_backup_base; }
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// The end of the backup area:
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char *eBptr() { return in_backup() ? _IO_read_end : _IO_save_end; }
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char *Nbase() { return _IO_save_base; }
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char *eNptr() { return _IO_save_end; }
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int have_backup() { return _IO_save_base != NULL; }
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int have_markers() { return _markers != NULL; }
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void free_backup_area();
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void unsave_markers(); // Make all streammarkers !saving().
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int put_mode() { return _flags & _IO_CURRENTLY_PUTTING; }
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int switch_to_get_mode();
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streambuf(int flags=0);
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public:
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static int flush_all();
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static void flush_all_linebuffered(); // Flush all line buffered files.
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virtual ~streambuf();
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virtual int overflow(int c = EOF); // Leave public for now
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virtual int underflow(); // Leave public for now
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virtual int uflow(); // Leave public for now
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virtual int pbackfail(int c);
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// virtual int showmany ();
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virtual streamsize xsputn(const char* s, streamsize n);
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virtual streamsize xsgetn(char* s, streamsize n);
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virtual streampos seekoff(streamoff, _seek_dir, int mode=ios::in|ios::out);
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virtual streampos seekpos(streampos pos, int mode = ios::in|ios::out);
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streampos pubseekoff(streamoff o, _seek_dir d, int mode=ios::in|ios::out)
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{ return _IO_seekoff (this, o, d, mode); }
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streampos pubseekpos(streampos pos, int mode = ios::in|ios::out)
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{ return _IO_seekpos (this, pos, mode); }
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streampos sseekoff(streamoff, _seek_dir, int mode=ios::in|ios::out);
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streampos sseekpos(streampos pos, int mode = ios::in|ios::out);
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virtual streambuf* setbuf(char* p, int len);
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virtual int sync();
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virtual int doallocate();
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int seekmark(streammarker& mark, int delta = 0);
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int sputbackc(char c);
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int sungetc();
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int unbuffered() { return _flags & _IO_UNBUFFERED ? 1 : 0; }
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int linebuffered() { return _flags & _IO_LINE_BUF ? 1 : 0; }
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void unbuffered(int i)
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{ if (i) _flags |= _IO_UNBUFFERED; else _flags &= ~_IO_UNBUFFERED; }
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void linebuffered(int i)
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{ if (i) _flags |= _IO_LINE_BUF; else _flags &= ~_IO_LINE_BUF; }
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int allocate() { // For AT&T compatibility
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if (base() || unbuffered()) return 0;
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else return doallocate(); }
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// Allocate a buffer if needed; use _shortbuf if appropriate.
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void allocbuf() { if (base() == NULL) doallocbuf(); }
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void doallocbuf();
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int in_avail() { return _IO_read_end - _IO_read_ptr; }
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int out_waiting() { return _IO_write_ptr - _IO_write_base; }
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streamsize sputn(const char* s, streamsize n) { return xsputn(s, n); }
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streamsize padn(char pad, streamsize n) { return _IO_padn(this, pad, n); }
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streamsize sgetn(char* s, streamsize n) { return _IO_sgetn(this, s, n); }
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int ignore(int);
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int get_column();
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int set_column(int);
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long sgetline(char* buf, _IO_size_t n, char delim, int putback_delim);
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int sputc(int c) { return _IO_putc(c, this); }
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int sbumpc() { return _IO_getc(this); }
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int sgetc() { return _IO_peekc(this); }
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int snextc() {
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if (_IO_read_ptr >= _IO_read_end && __underflow(this) == EOF)
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return EOF;
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else return _IO_read_ptr++, sgetc(); }
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void stossc() { if (_IO_read_ptr < _IO_read_end) _IO_read_ptr++; }
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int vscan(char const *fmt0, _IO_va_list ap, ios* stream = NULL);
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int scan(char const *fmt0 ...);
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int vform(char const *fmt0, _IO_va_list ap);
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int form(char const *fmt0 ...);
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#if 0 /* Work in progress */
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int column(); // Current column number (of put pointer). -1 is unknown.
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void column(int c); // Set column number of put pointer to c.
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#endif
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virtual streamsize sys_read(char* buf, streamsize size);
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virtual streamsize sys_write(const char*, streamsize);
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virtual streampos sys_seek(streamoff, _seek_dir);
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virtual int sys_close();
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virtual int sys_stat(void*); // Actually, a (struct stat*)
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#if _G_IO_IO_FILE_VERSION == 0x20001
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virtual int showmanyc();
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virtual void imbue(void *);
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#endif
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};
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// A backupbuf is a streambuf with full backup and savepoints on reading.
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// All standard streambufs in the GNU iostream library are backupbufs.
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class filebuf : public streambuf {
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protected:
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void init();
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public:
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static const int openprot; // Non-ANSI AT&T-ism: Default open protection.
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filebuf();
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filebuf(int fd);
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filebuf(int fd, char* p, int len);
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#if !_IO_UNIFIED_JUMPTABLES
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static filebuf *__new();
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#endif
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~filebuf();
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filebuf* attach(int fd);
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filebuf* open(const char *filename, const char *mode);
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filebuf* open(const char *filename, ios::openmode mode, int prot = 0664);
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virtual int underflow();
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virtual int overflow(int c = EOF);
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int is_open() const { return _fileno >= 0; }
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int fd() const { return is_open() ? _fileno : EOF; }
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filebuf* close();
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virtual int doallocate();
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virtual streampos seekoff(streamoff, _seek_dir, int mode=ios::in|ios::out);
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virtual streambuf* setbuf(char* p, int len);
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streamsize xsputn(const char* s, streamsize n);
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streamsize xsgetn(char* s, streamsize n);
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virtual int sync();
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protected: // See documentation in filebuf.C.
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// virtual int pbackfail(int c);
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int is_reading() { return eback() != egptr(); }
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char* cur_ptr() { return is_reading() ? gptr() : pptr(); }
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/* System's idea of pointer */
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char* file_ptr() { return eGptr(); }
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// Low-level operations (Usually invoke system calls.)
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virtual streamsize sys_read(char* buf, streamsize size);
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virtual streampos sys_seek(streamoff, _seek_dir);
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virtual streamsize sys_write(const char*, streamsize);
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virtual int sys_stat(void*); // Actually, a (struct stat*)
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virtual int sys_close();
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#if 0
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virtual uflow;
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virtual showmany;
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#endif
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};
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inline void ios::init(streambuf* sb, ostream* tie_to) {
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_state = sb ? ios::goodbit : ios::badbit; _exceptions=0;
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_strbuf=sb; _tie = tie_to; _width=0; _fill=' ';
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#ifdef _IO_NEW_STREAMS
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_flags=ios::skipws|ios::dec;
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#else
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|
_flags=ios::skipws|ios::dec|ios::dont_close;
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#endif
|
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_precision=6; _arrays = 0; }
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|
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inline ios::ios(streambuf* sb, ostream* tie_to) { init(sb, tie_to); }
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|
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inline ios::~ios() {
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#ifndef _IO_NEW_STREAMS
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if (!(_flags & (unsigned int)ios::dont_close)) delete rdbuf();
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#endif
|
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if (_arrays) delete [] _arrays;
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}
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} // extern "C++"
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#endif /* _STREAMBUF_H */
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