ddf1e65262
libstdc++/2071 * porting.texi: Add documentation about libstdc++-v3-specific macros that are currently included in os_defines.h files. * config/basic_file_stdio.h (sys_getc): New method. (sys_ungetc): New method. * include/bits/basic_file.h: (sys_getc): New method signature. (sys_ungetc): New method signature. * include/bits/fstream.tcc (underflow): Add conditional code paths which avoid using short seeks on streams (especially useful when the stream might be interactive or a pipe). At the moment, this alternate path only avoids seeking when the ``buffer size'' of underflow() is 1 since the C standard only guarantees buffer space for one ungetc (this technique could be extended since *-*-solaris* supports buffering for 4 calls to ungetc and *-*-*bsd* supports buffering limited only by memory resources). Also, _GLIBCPP_AVOID_FSEEK must be defined in a port's os_defines.h file for this alternate path to even be considered. As a bonus, the idiom of using getc/ungetc requires no system calls whereas fseek maps to one or two system call(s) on many platforms. * config/os/bsd/freebsd/bits/os_defines.h (_GLIBCPP_AVOID_FSEEK): Define it. * config/os/solaris/solaris2.5/bits/os_defines.h (_GLIBCPP_AVOID_FSEEK): Likewise. * config/os/solaris/solaris2.6/bits/os_defines.h (_GLIBCPP_AVOID_FSEEK): Likewise. * config/os/solaris/solaris2.7/bits/os_defines.h (_GLIBCPP_AVOID_FSEEK): Likewise. From-SVN: r43278
253 lines
6.8 KiB
C++
253 lines
6.8 KiB
C++
// Wrapper of C-language FILE struct -*- C++ -*-
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// Copyright (C) 2000, 2001 Free Software Foundation, Inc.
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//
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// This file is part of the GNU ISO C++ 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 along
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// 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,
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// USA.
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// As a special exception, you may use this file as part of a free software
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// library without restriction. Specifically, if other files instantiate
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// templates or use macros or inline functions from this file, or you compile
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// this file and link it with other files to produce an executable, this
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// file does not by itself cause the resulting executable to be covered by
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// the GNU General Public License. This exception does not however
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// invalidate any other reasons why the executable file might be covered by
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// the GNU General Public License.
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//
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// ISO C++ 14882: 27.8 File-based streams
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//
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namespace std
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{
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// Generic definitions for __basic_file
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template<typename _CharT>
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__basic_file<_CharT>::__basic_file(__c_lock* /*__lock*/)
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: _M_cfile(NULL), _M_cfile_created(false) { }
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template<typename _CharT>
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__basic_file<_CharT>::~__basic_file()
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{
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if (this->is_open())
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{
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fflush(_M_cfile);
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this->close();
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}
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}
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template<typename _CharT>
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void
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__basic_file<_CharT>::_M_open_mode(ios_base::openmode __mode,
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int& /*__p_mode*/, int& /*__rw_mode*/,
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char* __c_mode)
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{
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bool __testb = __mode & ios_base::binary;
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bool __testi = __mode & ios_base::in;
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bool __testo = __mode & ios_base::out;
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bool __testt = __mode & ios_base::trunc;
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bool __testa = __mode & ios_base::app;
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if (!__testi && __testo && !__testt && !__testa)
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strcpy(__c_mode, "w");
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if (!__testi && __testo && !__testt && __testa)
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strcpy(__c_mode, "a");
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if (!__testi && __testo && __testt && !__testa)
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strcpy(__c_mode, "w");
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if (__testi && !__testo && !__testt && !__testa)
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strcpy(__c_mode, "r");
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if (__testi && __testo && !__testt && !__testa)
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strcpy(__c_mode, "r+");
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if (__testi && __testo && __testt && !__testa)
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strcpy(__c_mode, "w+");
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if (__testb)
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strcat(__c_mode, "b");
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}
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template<typename _CharT>
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__basic_file<_CharT>*
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__basic_file<_CharT>::sys_open(__c_file_type* __file, ios_base::openmode)
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{
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__basic_file* __ret = NULL;
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if (!this->is_open() && __file)
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{
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_M_cfile = __file;
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_M_cfile_created = false;
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__ret = this;
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}
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return __ret;
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}
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template<typename _CharT>
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_CharT
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__basic_file<_CharT>::sys_getc()
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{
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return getc (_M_cfile);
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}
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template<typename _CharT>
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_CharT
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__basic_file<_CharT>::sys_ungetc(_CharT __s)
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{
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return ungetc (__s, _M_cfile);
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}
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template<typename _CharT>
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__basic_file<_CharT>*
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__basic_file<_CharT>::open(const char* __name, ios_base::openmode __mode,
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int /*__prot*/)
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{
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__basic_file* __ret = NULL;
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int __p_mode = 0;
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int __rw_mode = 0;
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char __c_mode[4];
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_M_open_mode(__mode, __p_mode, __rw_mode, __c_mode);
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if (!this->is_open())
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{
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if ((_M_cfile = fopen(__name, __c_mode)))
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{
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_M_cfile_created = true;
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__ret = this;
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}
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}
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return __ret;
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}
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template<typename _CharT>
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bool
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__basic_file<_CharT>::is_open() { return _M_cfile != 0; }
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template<typename _CharT>
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__basic_file<_CharT>*
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__basic_file<_CharT>::close()
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{
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__basic_file* __retval = static_cast<__basic_file*>(NULL);
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if (_M_cfile_created && fclose(_M_cfile))
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__retval = this;
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return __retval;
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}
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template<typename _CharT>
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streamsize
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__basic_file<_CharT>::xsgetn(_CharT* __s, streamsize __n)
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{ return fread(__s, 1, __n, _M_cfile); }
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template<typename _CharT>
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streamsize
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__basic_file<_CharT>::xsputn(const _CharT* __s, streamsize __n)
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{ return fwrite(__s, 1, __n, _M_cfile); }
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template<typename _CharT>
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streamoff
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__basic_file<_CharT>::seekoff(streamoff __off, ios_base::seekdir __way,
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ios_base::openmode /*__mode*/)
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{ fseek(_M_cfile, __off, __way); return ftell(_M_cfile); }
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template<typename _CharT>
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streamoff
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__basic_file<_CharT>::seekpos(streamoff __pos,
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ios_base::openmode /*__mode*/)
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{ fseek(_M_cfile, __pos, ios_base::beg); return ftell(_M_cfile); }
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template<typename _CharT>
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int
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__basic_file<_CharT>::sync()
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{ return fflush(_M_cfile); }
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// NB: Unused.
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template<typename _CharT>
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int
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__basic_file<_CharT>::overflow(int /*__c*/)
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{ return EOF; }
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// NB: Unused.
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template<typename _CharT>
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int
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__basic_file<_CharT>::underflow()
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{ return EOF; }
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// NB: Unused.
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template<typename _CharT>
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int
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__basic_file<_CharT>::uflow()
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{ return EOF; }
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// NB: Unused.
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template<typename _CharT>
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int
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__basic_file<_CharT>::pbackfail(int /*__c*/)
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{ return EOF; }
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// NB: Unused.
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template<typename _CharT>
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streambuf*
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__basic_file<_CharT>::setbuf(_CharT* /*__b*/, int /*__len*/)
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{ return reinterpret_cast<streambuf*>(this); }
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// NB: Unused.
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template<typename _CharT>
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int
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__basic_file<_CharT>::doallocate()
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{ return EOF; }
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// NB: Unused.
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template<typename _CharT>
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streamsize
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__basic_file<_CharT>::sys_read(_CharT* __s, streamsize __n)
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{ return fread(__s, 1, __n, _M_cfile); }
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// NB: Unused.
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template<typename _CharT>
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streamsize
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__basic_file<_CharT>::sys_write(const _CharT* __s, streamsize __n)
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{ return fwrite(__s, 1, __n, _M_cfile); }
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// NB: Unused.
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template<typename _CharT>
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streamoff
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__basic_file<_CharT>::sys_seek(streamoff __pos, ios_base::seekdir __way)
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{
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fseek(_M_cfile, __pos, __way);
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return ftell(_M_cfile);
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}
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// NB: Unused.
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template<typename _CharT>
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int
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__basic_file<_CharT>::sys_close()
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{ return fclose(_M_cfile); }
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// NB: Unused.
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template<typename _CharT>
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int
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__basic_file<_CharT>::sys_stat(void* /*__v*/)
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{ return EOF; }
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// NB: Unused.
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template<typename _CharT>
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int
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__basic_file<_CharT>::showmanyc()
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{ return EOF; }
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// NB: Unused.
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template<typename _CharT>
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void
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__basic_file<_CharT>::imbue(void* /*__v*/) { }
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} // namespace std
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