mirror of
https://github.com/autc04/Retro68.git
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381 lines
9.3 KiB
C++
381 lines
9.3 KiB
C++
// Wrapper of C-language FILE struct -*- C++ -*-
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// Copyright (C) 2000-2015 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 3, 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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// Under Section 7 of GPL version 3, you are granted additional
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// permissions described in the GCC Runtime Library Exception, version
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// 3.1, as published by the Free Software Foundation.
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// You should have received a copy of the GNU General Public License and
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// a copy of the GCC Runtime Library Exception along with this program;
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// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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// <http://www.gnu.org/licenses/>.
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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 <errno.h>
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#ifdef _GLIBCXX_HAVE_POLL
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#include <poll.h>
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#endif
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// Pick up ioctl on Solaris 2.8
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#ifdef _GLIBCXX_HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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// Pick up FIONREAD on Solaris 2
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#ifdef _GLIBCXX_HAVE_SYS_IOCTL_H
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#define BSD_COMP
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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 _GLIBCXX_HAVE_SYS_FILIO_H
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#include <sys/filio.h>
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#endif
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#ifdef _GLIBCXX_HAVE_SYS_UIO_H
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#include <sys/uio.h>
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#endif
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#if defined(_GLIBCXX_HAVE_S_ISREG) || defined(_GLIBCXX_HAVE_S_IFREG)
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# include <sys/stat.h>
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# ifdef _GLIBCXX_HAVE_S_ISREG
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# define _GLIBCXX_ISREG(x) S_ISREG(x)
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# else
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# define _GLIBCXX_ISREG(x) (((x) & S_IFMT) == S_IFREG)
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# endif
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#endif
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#include <limits> // For <off_t>::max() and min() and <streamsize>::max()
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namespace
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{
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// Map ios_base::openmode flags to a string for use in fopen().
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// Table of valid combinations as given in [lib.filebuf.members]/2.
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static const char*
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fopen_mode(std::ios_base::openmode mode)
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{
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enum
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{
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in = std::ios_base::in,
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out = std::ios_base::out,
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trunc = std::ios_base::trunc,
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app = std::ios_base::app,
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binary = std::ios_base::binary
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};
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// _GLIBCXX_RESOLVE_LIB_DEFECTS
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// 596. 27.8.1.3 Table 112 omits "a+" and "a+b" modes.
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switch (mode & (in|out|trunc|app|binary))
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{
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case ( out ): return "w";
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case ( out |app ): return "a";
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case ( app ): return "a";
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case ( out|trunc ): return "w";
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case (in ): return "r";
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case (in|out ): return "r+";
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case (in|out|trunc ): return "w+";
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case (in|out |app ): return "a+";
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case (in |app ): return "a+";
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case ( out |binary): return "wb";
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case ( out |app|binary): return "ab";
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case ( app|binary): return "ab";
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case ( out|trunc |binary): return "wb";
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case (in |binary): return "rb";
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case (in|out |binary): return "r+b";
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case (in|out|trunc |binary): return "w+b";
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case (in|out |app|binary): return "a+b";
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case (in |app|binary): return "a+b";
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default: return 0; // invalid
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}
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}
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// Wrapper handling partial write.
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static std::streamsize
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xwrite(int __fd, const char* __s, std::streamsize __n)
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{
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std::streamsize __nleft = __n;
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for (;;)
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{
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const std::streamsize __ret = write(__fd, __s, __nleft);
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if (__ret == -1L && errno == EINTR)
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continue;
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if (__ret == -1L)
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break;
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__nleft -= __ret;
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if (__nleft == 0)
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break;
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__s += __ret;
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}
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return __n - __nleft;
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}
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#ifdef _GLIBCXX_HAVE_WRITEV
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// Wrapper handling partial writev.
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static std::streamsize
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xwritev(int __fd, const char* __s1, std::streamsize __n1,
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const char* __s2, std::streamsize __n2)
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{
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std::streamsize __nleft = __n1 + __n2;
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std::streamsize __n1_left = __n1;
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struct iovec __iov[2];
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__iov[1].iov_base = const_cast<char*>(__s2);
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__iov[1].iov_len = __n2;
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for (;;)
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{
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__iov[0].iov_base = const_cast<char*>(__s1);
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__iov[0].iov_len = __n1_left;
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const std::streamsize __ret = writev(__fd, __iov, 2);
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if (__ret == -1L && errno == EINTR)
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continue;
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if (__ret == -1L)
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break;
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__nleft -= __ret;
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if (__nleft == 0)
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break;
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const std::streamsize __off = __ret - __n1_left;
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if (__off >= 0)
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{
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__nleft -= xwrite(__fd, __s2 + __off, __n2 - __off);
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break;
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}
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__s1 += __ret;
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__n1_left -= __ret;
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}
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return __n1 + __n2 - __nleft;
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}
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#endif
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} // anonymous namespace
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namespace std _GLIBCXX_VISIBILITY(default)
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{
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_GLIBCXX_BEGIN_NAMESPACE_VERSION
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// Definitions for __basic_file<char>.
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__basic_file<char>::__basic_file(__c_lock* /*__lock*/) throw()
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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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__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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int __err;
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errno = 0;
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do
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__err = this->sync();
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while (__err && errno == EINTR);
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if (!__err)
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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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}
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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) throw ()
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{
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__basic_file* __ret = NULL;
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const char* __c_mode = fopen_mode(__mode);
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if (__c_mode && !this->is_open() && (_M_cfile = fdopen(__fd, __c_mode)))
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{
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char* __buf = NULL;
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_M_cfile_created = true;
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if (__fd == 0)
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setvbuf(_M_cfile, __buf, _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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__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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const char* __c_mode = fopen_mode(__mode);
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if (__c_mode && !this->is_open())
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{
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#ifdef _GLIBCXX_USE_LFS
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if ((_M_cfile = fopen64(__name, __c_mode)))
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#else
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if ((_M_cfile = fopen(__name, __c_mode)))
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#endif
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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 throw ()
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{ return _M_cfile != 0; }
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int
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__basic_file<char>::fd() throw ()
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{ return fileno(_M_cfile); }
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__c_file*
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__basic_file<char>::file() throw ()
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{ return _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* __ret = static_cast<__basic_file*>(NULL);
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if (this->is_open())
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{
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int __err = 0;
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if (_M_cfile_created)
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{
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// In general, no need to zero errno in advance if checking
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// for error first. However, C89/C99 (at variance with IEEE
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// 1003.1, f.i.) do not mandate that fclose must set errno
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// upon error.
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errno = 0;
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do
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__err = fclose(_M_cfile);
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while (__err && errno == EINTR);
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}
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_M_cfile = 0;
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if (!__err)
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__ret = this;
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}
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return __ret;
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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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{ return xwrite(this->fd(), __s, __n); }
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streamsize
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__basic_file<char>::xsputn_2(const char* __s1, streamsize __n1,
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const char* __s2, streamsize __n2)
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{
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streamsize __ret = 0;
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#ifdef _GLIBCXX_HAVE_WRITEV
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__ret = xwritev(this->fd(), __s1, __n1, __s2, __n2);
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#else
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if (__n1)
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__ret = xwrite(this->fd(), __s1, __n1);
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if (__ret == __n1)
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__ret += xwrite(this->fd(), __s2, __n2);
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#endif
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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) throw ()
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{
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#ifdef _GLIBCXX_USE_LFS
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return lseek64(this->fd(), __off, __way);
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#else
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if (__off > numeric_limits<off_t>::max()
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|| __off < numeric_limits<off_t>::min())
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return -1L;
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return lseek(this->fd(), __off, __way);
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#endif
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}
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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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#ifndef _GLIBCXX_NO_IOCTL
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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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#endif
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#ifdef _GLIBCXX_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(_GLIBCXX_HAVE_S_ISREG) || defined(_GLIBCXX_HAVE_S_IFREG)
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// Regular files.
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#ifdef _GLIBCXX_USE_LFS
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struct stat64 __buffer;
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const int __err = fstat64(this->fd(), &__buffer);
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if (!__err && _GLIBCXX_ISREG(__buffer.st_mode))
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{
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const streamoff __off = __buffer.st_size - lseek64(this->fd(), 0,
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ios_base::cur);
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return std::min(__off, streamoff(numeric_limits<streamsize>::max()));
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}
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#else
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struct stat __buffer;
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const int __err = fstat(this->fd(), &__buffer);
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if (!__err && _GLIBCXX_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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#endif
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return 0;
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}
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_GLIBCXX_END_NAMESPACE_VERSION
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} // namespace
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