272 lines
6.9 KiB
C++
272 lines
6.9 KiB
C++
// Wrapper of C-language FILE struct -*- C++ -*-
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// Copyright (C) 2000, 2001, 2002, 2003 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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#include <bits/basic_file.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <errno.h>
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#ifdef _GLIBCPP_HAVE_SYS_IOCTL_H
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#define BSD_COMP /* Get FIONREAD on Solaris2. */
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#include <sys/ioctl.h>
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#endif
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// Pick up FIONREAD on Solaris 2.5.
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#ifdef _GLIBCPP_HAVE_SYS_FILIO_H
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#include <sys/filio.h>
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#endif
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#ifdef _GLIBCPP_HAVE_POLL
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#include <poll.h>
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#endif
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#if defined(_GLIBCPP_HAVE_S_ISREG) || defined(_GLIBCPP_HAVE_S_IFREG)
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# include <sys/stat.h>
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# ifdef _GLIBCPP_HAVE_S_ISREG
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# define _GLIBCPP_ISREG(x) S_ISREG(x)
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# else
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# define _GLIBCPP_ISREG(x) (((x) & S_IFMT) == S_IFREG)
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# endif
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#endif
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namespace std
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{
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// Definitions for __basic_file<char>.
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__basic_file<char>::__basic_file(__c_lock* /*__lock*/)
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: _M_cfile(NULL), _M_cfile_created(false) { }
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__basic_file<char>::~__basic_file()
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{ this->close(); }
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void
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__basic_file<char>::_M_open_mode(ios_base::openmode __mode, int& __p_mode,
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int&, 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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// Set __c_mode for use in fopen.
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// Set __p_mode for use in open.
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if (!__testi && __testo && !__testt && !__testa)
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{
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strcpy(__c_mode, "w");
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__p_mode = (O_WRONLY | O_CREAT);
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}
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if (!__testi && __testo && !__testt && __testa)
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{
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strcpy(__c_mode, "a");
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__p_mode |= O_WRONLY | O_CREAT | O_APPEND;
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}
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if (!__testi && __testo && __testt && !__testa)
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{
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strcpy(__c_mode, "w");
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__p_mode |= O_WRONLY | O_CREAT | O_TRUNC;
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}
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if (__testi && !__testo && !__testt && !__testa)
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{
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strcpy(__c_mode, "r");
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__p_mode |= O_RDONLY;
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}
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if (__testi && __testo && !__testt && !__testa)
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{
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strcpy(__c_mode, "r+");
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__p_mode |= O_RDWR | O_CREAT;
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}
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if (__testi && __testo && __testt && !__testa)
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{
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strcpy(__c_mode, "w+");
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__p_mode |= O_RDWR | O_CREAT | O_TRUNC;
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}
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if (__testb)
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strcat(__c_mode, "b");
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}
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__basic_file<char>*
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__basic_file<char>::sys_open(__c_file* __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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__basic_file<char>*
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__basic_file<char>::sys_open(int __fd, ios_base::openmode __mode,
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bool __del)
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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() && (_M_cfile = fdopen(__fd, __c_mode)))
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{
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// Iff __del is true, then close will fclose the fd.
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_M_cfile_created = __del;
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if (__fd == 0)
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setvbuf(_M_cfile, reinterpret_cast<char*>(NULL), _IONBF, 0);
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__ret = this;
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}
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return __ret;
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}
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int
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__basic_file<char>::sys_getc()
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{ return getc(_M_cfile); }
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int
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__basic_file<char>::sys_ungetc(int __c)
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{ return ungetc(__c, _M_cfile); }
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__basic_file<char>*
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__basic_file<char>::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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bool
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__basic_file<char>::is_open() const
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{ return _M_cfile != 0; }
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int
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__basic_file<char>::fd()
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{ return fileno(_M_cfile) ; }
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__basic_file<char>*
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__basic_file<char>::close()
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{
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__basic_file* __retval = static_cast<__basic_file*>(NULL);
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if (this->is_open())
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{
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if (_M_cfile_created)
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fclose(_M_cfile);
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else
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fflush(_M_cfile);
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_M_cfile = 0;
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__retval = this;
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}
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return __retval;
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}
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streamsize
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__basic_file<char>::xsgetn(char* __s, streamsize __n)
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{
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streamsize __ret;
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do
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__ret = read(this->fd(), __s, __n);
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while (__ret == -1L && errno == EINTR);
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return __ret;
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}
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streamsize
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__basic_file<char>::xsputn(const char* __s, streamsize __n)
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{
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streamsize __ret;
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do
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__ret = write(this->fd(), __s, __n);
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while (__ret == -1L && errno == EINTR);
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return __ret;
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}
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streamoff
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__basic_file<char>::seekoff(streamoff __off, ios_base::seekdir __way,
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ios_base::openmode /*__mode*/)
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{ return lseek(this->fd(), __off, __way); }
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streamoff
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__basic_file<char>::seekpos(streamoff __pos, ios_base::openmode /*__mode*/)
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{ return lseek(this->fd(), __pos, ios_base::beg); }
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int
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__basic_file<char>::sync()
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{ return fflush(_M_cfile); }
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streamsize
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__basic_file<char>::showmanyc()
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{
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#ifdef FIONREAD
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// Pipes and sockets.
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int __num = 0;
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int __r = ioctl(this->fd(), FIONREAD, &__num);
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if (!__r && __num >= 0)
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return __num;
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#endif
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#ifdef _GLIBCPP_HAVE_POLL
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// Cheap test.
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struct pollfd __pfd[1];
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__pfd[0].fd = this->fd();
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__pfd[0].events = POLLIN;
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if (poll(__pfd, 1, 0) <= 0)
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return 0;
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#endif
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#if defined(_GLIBCPP_HAVE_S_ISREG) || defined(_GLIBCPP_HAVE_S_IFREG)
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// Regular files.
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struct stat __buffer;
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int __ret = fstat(this->fd(), &__buffer);
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if (!__ret && _GLIBCPP_ISREG(__buffer.st_mode))
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return __buffer.st_size - lseek(this->fd(), 0, ios_base::cur);
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#endif
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return 0;
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}
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} // namespace std
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