[thirdparty/gcc.git] / libstdc++-v3 / config / io / basic_file_stdio.cc

// Wrapper of C-language FILE struct -*- C++ -*-

// Copyright (C) 2000-2024 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library.  This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 3, or (at your option)
// any later version.

// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// Under Section 7 of GPL version 3, you are granted additional
// permissions described in the GCC Runtime Library Exception, version
// 3.1, as published by the Free Software Foundation.

// You should have received a copy of the GNU General Public License and
// a copy of the GCC Runtime Library Exception along with this program;
// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
// <http://www.gnu.org/licenses/>.

//
// ISO C++ 14882: 27.8  File-based streams
//

#include <bits/largefile-config.h>
#include <bits/basic_file.h>
#include <fcntl.h>
#include <errno.h>

#ifdef _GLIBCXX_HAVE_POLL
#include <poll.h>
#endif

// Pick up ioctl on Solaris 2.8
#ifdef _GLIBCXX_HAVE_UNISTD_H
#include <unistd.h>
#endif

// Pick up FIONREAD on Solaris 2
#ifdef _GLIBCXX_HAVE_SYS_IOCTL_H
#define BSD_COMP
#include <sys/ioctl.h>
#endif

// Pick up FIONREAD on Solaris 2.5.
#ifdef _GLIBCXX_HAVE_SYS_FILIO_H
#include <sys/filio.h>
#endif

#ifdef _GLIBCXX_HAVE_SYS_UIO_H
#include <sys/uio.h>
#endif

#if defined(_GLIBCXX_HAVE_S_ISREG) || defined(_GLIBCXX_HAVE_S_IFREG)
# include <sys/stat.h>
# ifdef _GLIBCXX_HAVE_S_ISREG
#  define _GLIBCXX_ISREG(x) S_ISREG(x)
# else
#  define _GLIBCXX_ISREG(x) (((x) & S_IFMT) == S_IFREG)
# endif
#endif

#include <limits> // For <off_t>::max() and min() and <streamsize>::max()

#if _GLIBCXX_USE__GET_OSFHANDLE
# include <stdint.h> // For intptr_t
# include <io.h>     // For _get_osfhandle
#endif

namespace
{
  // Map ios_base::openmode flags to a string for use in fopen().
  // Table of valid combinations as given in [lib.filebuf.members]/2.
  static const char*
  fopen_mode(std::ios_base::openmode mode)
  {
    enum
      {
	in     = std::ios_base::in,
	out    = std::ios_base::out,
	trunc  = std::ios_base::trunc,
	app    = std::ios_base::app,
	binary = std::ios_base::binary,
	noreplace = std::_S_noreplace
      };

    // _GLIBCXX_RESOLVE_LIB_DEFECTS
    // 596. 27.8.1.3 Table 112 omits "a+" and "a+b" modes.
    switch (mode & (in|out|trunc|app|binary|noreplace))
      {
      case (   out                           ): return "w";
      case (   out                 |noreplace): return "wx";
      case (   out|trunc                     ): return "w";
      case (   out|trunc           |noreplace): return "wx";
      case (   out      |app                 ): return "a";
      case (             app                 ): return "a";
      case (in                               ): return "r";
      case (in|out                           ): return "r+";
      case (in|out|trunc                     ): return "w+";
      case (in|out|trunc           |noreplace): return "w+x";
      case (in|out      |app                 ): return "a+";
      case (in          |app                 ): return "a+";

      case (   out          |binary          ): return "wb";
      case (   out          |binary|noreplace): return "wbx";
      case (   out      |app|binary          ): return "ab";
      case (             app|binary          ): return "ab";
      case (   out|trunc    |binary          ): return "wb";
      case (in              |binary          ): return "rb";
      case (in|out          |binary          ): return "r+b";
      case (in|out|trunc    |binary          ): return "w+b";
      case (in|out|trunc    |binary|noreplace): return "w+bx";
      case (in|out      |app|binary          ): return "a+b";
      case (in          |app|binary          ): return "a+b";

      default: return 0; // invalid
      }
  }

  // Wrapper handling partial write.
  static std::streamsize
#ifdef _GLIBCXX_USE_STDIO_PURE
  xwrite(FILE *__file, const char* __s, std::streamsize __n)
#else
  xwrite(int __fd, const char* __s, std::streamsize __n)
#endif
  {
    std::streamsize __nleft = __n;

    for (;;)
      {
#ifdef _GLIBCXX_USE_STDIO_PURE
	const std::streamsize __ret = fwrite(__s, 1, __nleft, __file);
	if (__ret == 0 && ferror(__file))
	  break;
#else
	const std::streamsize __ret = write(__fd, __s, __nleft);
	if (__ret == -1L && errno == EINTR)
	  continue;
	if (__ret == -1L)
	  break;
#endif
	__nleft -= __ret;
	if (__nleft == 0)
	  break;

	__s += __ret;
      }

    return __n - __nleft;
  }

#if defined(_GLIBCXX_HAVE_WRITEV) && !defined(_GLIBCXX_USE_STDIO_PURE)
  // Wrapper handling partial writev.
  static std::streamsize
  xwritev(int __fd, const char* __s1, std::streamsize __n1,
	  const char* __s2, std::streamsize __n2)
  {
    std::streamsize __nleft = __n1 + __n2;
    std::streamsize __n1_left = __n1;

    struct iovec __iov[2];
    __iov[1].iov_base = const_cast<char*>(__s2);
    __iov[1].iov_len = __n2;

    for (;;)
      {
	__iov[0].iov_base = const_cast<char*>(__s1);
	__iov[0].iov_len = __n1_left;

	const std::streamsize __ret = writev(__fd, __iov, 2);
	if (__ret == -1L && errno == EINTR)
	  continue;
	if (__ret == -1L)
	  break;

	__nleft -= __ret;
	if (__nleft == 0)
	  break;

	const std::streamsize __off = __ret - __n1_left;
	if (__off >= 0)
	  {
	    __nleft -= xwrite(__fd, __s2 + __off, __n2 - __off);
	    break;
	  }

	__s1 += __ret;
	__n1_left -= __ret;
      }

    return __n1 + __n2 - __nleft;
  }
#endif
} // anonymous namespace


namespace std _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION

  // Definitions for __basic_file<char>.
  __basic_file<char>::__basic_file(__c_lock* /*__lock*/) throw()
  : _M_cfile(NULL), _M_cfile_created(false) { }

  __basic_file<char>::~__basic_file()
  { this->close(); }

  __basic_file<char>*
  __basic_file<char>::sys_open(__c_file* __file, ios_base::openmode)
  {
    __basic_file* __ret = NULL;
    if (!this->is_open() && __file)
      {
	int __err, __save_errno = errno;
	// POSIX guarantees that fflush sets errno on error, but C doesn't.
	errno = 0;
	do
	  __err = fflush(__file);
	while (__err && errno == EINTR);
	errno = __save_errno;
	if (!__err)
	  {
	    _M_cfile = __file;
	    _M_cfile_created = false;
	    __ret = this;
	  }
      }
    return __ret;
  }

  __basic_file<char>*
  __basic_file<char>::sys_open(int __fd, ios_base::openmode __mode) throw ()
  {
    __basic_file* __ret = NULL;
    const char* __c_mode = fopen_mode(__mode);
    if (__c_mode && !this->is_open() && (_M_cfile = fdopen(__fd, __c_mode)))
      {
	char* __buf = NULL;
	_M_cfile_created = true;
	if (__fd == 0)
	  setvbuf(_M_cfile, __buf, _IONBF, 0);
	__ret = this;
      }
    return __ret;
  }

  __basic_file<char>*
  __basic_file<char>::open(const char* __name, ios_base::openmode __mode,
			   int /*__prot*/)
  {
    __basic_file* __ret = NULL;
    const char* __c_mode = fopen_mode(__mode);
    if (__c_mode && !this->is_open())
      {
	if ((_M_cfile = fopen(__name, __c_mode)))
	  {
	    _M_cfile_created = true;
	    __ret = this;
	  }
      }
    return __ret;
  }

#if _GLIBCXX_HAVE__WFOPEN && _GLIBCXX_USE_WCHAR_T
  __basic_file<char>*
  __basic_file<char>::open(const wchar_t* __name, ios_base::openmode __mode)
  {
    __basic_file* __ret = NULL;
    const char* __c_mode = fopen_mode(__mode);
    if (__c_mode && !this->is_open())
      {
	wchar_t __wc_mode[4] = { };
	int __i = 0;
	do
	  {
	    switch(__c_mode[__i]) {
	    case 'a': __wc_mode[__i] = L'a'; break;
	    case 'b': __wc_mode[__i] = L'b'; break;
	    case 'r': __wc_mode[__i] = L'r'; break;
	    case 'w': __wc_mode[__i] = L'w'; break;
	    case '+': __wc_mode[__i] = L'+'; break;
	    default: return __ret;
	    }
	  }
	while (__c_mode[++__i]);

	if ((_M_cfile = _wfopen(__name, __wc_mode)))
	  {
	    _M_cfile_created = true;
	    __ret = this;
	  }
      }
    return __ret;
  }
#endif

  bool
  __basic_file<char>::is_open() const throw ()
  { return _M_cfile != 0; }

#ifndef _GLIBCCXX_USE_STDIO_PURE
  int
  __basic_file<char>::fd() throw ()
  { return fileno(_M_cfile); }
#endif

  __c_file*
  __basic_file<char>::file() throw ()
  { return _M_cfile; }

  __basic_file<char>*
  __basic_file<char>::close()
  {
    __basic_file* __ret = static_cast<__basic_file*>(NULL);
    if (this->is_open())
      {
	int __err = 0;
	if (_M_cfile_created)
	  __err = fclose(_M_cfile);
	_M_cfile = 0;
	if (!__err)
	  __ret = this;
      }
    return __ret;
  }

  streamsize
  __basic_file<char>::xsgetn(char* __s, streamsize __n)
  {
    streamsize __ret;
#ifdef _GLIBCXX_USE_STDIO_PURE
    __ret = fread(__s, 1, __n, this->file());
    if (__ret == 0 && ferror(this->file()))
      __ret = -1;
#else
    do
      __ret = read(this->fd(), __s, __n);
    while (__ret == -1L && errno == EINTR);
#endif
    return __ret;
  }

  streamsize
  __basic_file<char>::xsputn(const char* __s, streamsize __n)
  {
#ifdef _GLIBCXX_USE_STDIO_PURE
    return xwrite(this->file(), __s, __n);
#else
    return xwrite(this->fd(), __s, __n);
#endif
  }

  streamsize
  __basic_file<char>::xsputn_2(const char* __s1, streamsize __n1,
			       const char* __s2, streamsize __n2)
  {
    streamsize __ret = 0;
#if defined(_GLIBCXX_HAVE_WRITEV) && !defined(_GLIBCXX_USE_STDIO_PURE)
    __ret = xwritev(this->fd(), __s1, __n1, __s2, __n2);
#else
    if (__n1)
#ifdef _GLIBCXX_USE_STDIO_PURE
      __ret = xwrite(this->file(), __s1, __n1);
#else
      __ret = xwrite(this->fd(), __s1, __n1);
#endif

    if (__ret == __n1)
#ifdef _GLIBCXX_USE_STDIO_PURE
      __ret += xwrite(this->file(), __s2, __n2);
#else
      __ret += xwrite(this->fd(), __s2, __n2);
#endif
#endif
    return __ret;
  }

  namespace
  {
    inline streamoff
    get_file_offset(__basic_file<char>* __f)
    {
#ifdef _GLIBCXX_USE_STDIO_PURE
# ifdef _GLIBCXX_USE_FSEEKO_FTELLO
      return ftello(__f->file());
# else
      return ftell(__f->file());
# endif
#else
      return lseek(__f->fd(), 0, (int)ios_base::cur);
#endif
    }
  }

  streamoff
  __basic_file<char>::seekoff(streamoff __off, ios_base::seekdir __way) throw ()
  {
#ifdef _GLIBCXX_USE_STDIO_PURE
#ifdef _GLIBCXX_USE_FSEEKO_FTELLO
    if _GLIBCXX17_CONSTEXPR (sizeof(off_t) > sizeof(long))
      {
	if (fseeko(this->file(), __off, __way))
	  return -1;
      }
    else
#endif
      {
	if (__off > numeric_limits<long>::max()
	      || __off < numeric_limits<long>::min())
	  return -1;
	if (fseek(this->file(), __off, __way))
	  return -1;
      }
    return __way == ios_base::beg ? __off : std::get_file_offset(this);
#else
    if _GLIBCXX17_CONSTEXPR (sizeof(streamoff) > sizeof(off_t))
      if (__off > numeric_limits<off_t>::max()
	    || __off < numeric_limits<off_t>::min())
      return -1L;
    return lseek(this->fd(), __off, __way);
#endif
  }

  int
  __basic_file<char>::sync()
  { return fflush(_M_cfile); }

  streamsize
  __basic_file<char>::showmanyc()
  {
#if !defined(_GLIBCXX_NO_IOCTL) && !defined(_GLIBCXX_USE_STDIO_PURE)
#ifdef FIONREAD
    // Pipes and sockets.
    int __num = 0;
    int __r = ioctl(this->fd(), FIONREAD, &__num);
    if (!__r && __num >= 0)
      return __num;
#endif
#endif

#if defined(_GLIBCXX_HAVE_POLL) && !defined(_GLIBCXX_USE_STDIO_PURE)
    // Cheap test.
    struct pollfd __pfd[1];
    __pfd[0].fd = this->fd();
    __pfd[0].events = POLLIN;
    if (poll(__pfd, 1, 0) <= 0)
      return 0;
#endif

#if defined(_GLIBCXX_HAVE_S_ISREG) || defined(_GLIBCXX_HAVE_S_IFREG)
    // Regular files.
    struct stat __buffer;
    const int __err = fstat(this->fd(), &__buffer);
    if (!__err && _GLIBCXX_ISREG(__buffer.st_mode))
      {
	const streamoff __off = __buffer.st_size - std::get_file_offset(this);
	return std::min(__off, streamoff(numeric_limits<streamsize>::max()));
      }
#endif
    return 0;
  }

  __basic_file<char>::native_handle_type
  __basic_file<char>::native_handle() const noexcept
  {
#ifdef _GLIBCXX_USE_STDIO_PURE
    return _M_cfile;
#elif _GLIBCXX_USE__GET_OSFHANDLE
    const intptr_t handle = _M_cfile ? _get_osfhandle(fileno(_M_cfile)) : -1;
    return reinterpret_cast<native_handle_type>(handle);
#else
    return fileno(_M_cfile);
#endif
  }

_GLIBCXX_END_NAMESPACE_VERSION
} // namespace
Commit	Line	Data
c0a26060 BK	1	// Wrapper of C-language FILE struct -- C++ --
c0a26060 BK	2
a945c346	3	// Copyright (C) 2000-2024 Free Software Foundation, Inc.
c0a26060 BK	4	//
	5	// This file is part of the GNU ISO C++ Library. This library is free
	6	// software; you can redistribute it and/or modify it under the
	7	// terms of the GNU General Public License as published by the
748086b7	8	// Free Software Foundation; either version 3, or (at your option)
c0a26060 BK	9	// any later version.
	10
	11	// This library is distributed in the hope that it will be useful,
	12	// but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	// GNU General Public License for more details.
	15
748086b7 JJ	16	// Under Section 7 of GPL version 3, you are granted additional
	17	// permissions described in the GCC Runtime Library Exception, version
	18	// 3.1, as published by the Free Software Foundation.
c0a26060	19
748086b7 JJ	20	// You should have received a copy of the GNU General Public License and
	21	// a copy of the GCC Runtime Library Exception along with this program;
	22	// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
	23	// <http://www.gnu.org/licenses/>.
c0a26060 BK	24
	25	//
	26	// ISO C++ 14882: 27.8 File-based streams
	27	//
	28
61fe96d4	29	#include <bits/largefile-config.h>
c0a26060	30	#include <bits/basic_file.h>
6eeb7d7a	31	#include <fcntl.h>
95dca20c	32	#include <errno.h>
c0a26060	33
2b1be54b BS	34	#ifdef _GLIBCXX_HAVE_POLL
	35	#include <poll.h>
	36	#endif
	37
	38	// Pick up ioctl on Solaris 2.8
	39	#ifdef _GLIBCXX_HAVE_UNISTD_H
	40	#include <unistd.h>
	41	#endif
	42
	43	// Pick up FIONREAD on Solaris 2
3d7c150e	44	#ifdef _GLIBCXX_HAVE_SYS_IOCTL_H
f92ab29f	45	#define BSD_COMP
bbacb998 PC	46	#include <sys/ioctl.h>
	47	#endif
	48
	49	// Pick up FIONREAD on Solaris 2.5.
3d7c150e	50	#ifdef _GLIBCXX_HAVE_SYS_FILIO_H
bbacb998 PC	51	#include <sys/filio.h>
	52	#endif
	53
bda243ec PC	54	#ifdef _GLIBCXX_HAVE_SYS_UIO_H
	55	#include <sys/uio.h>
	56	#endif
	57
3d7c150e	58	#if defined(_GLIBCXX_HAVE_S_ISREG) \|\| defined(_GLIBCXX_HAVE_S_IFREG)
bbacb998	59	# include <sys/stat.h>
3d7c150e BK	60	# ifdef _GLIBCXX_HAVE_S_ISREG
3d7c150e BK	61	# define _GLIBCXX_ISREG(x) S_ISREG(x)
bbacb998	62	# else
3d7c150e	63	# define _GLIBCXX_ISREG(x) (((x) & S_IFMT) == S_IFREG)
bbacb998 PC	64	# endif
	65	#endif
	66
dd5d134b	67	#include <limits> // For <off_t>::max() and min() and <streamsize>::max()
3d05b345	68
c4baeaec JW	69	#if _GLIBCXX_USE__GET_OSFHANDLE
	70	# include <stdint.h> // For intptr_t
	71	# include <io.h> // For _get_osfhandle
	72	#endif
	73
f92ab29f	74	namespace
6a734d61 BK	75	{
	76	// Map ios_base::openmode flags to a string for use in fopen().
	77	// Table of valid combinations as given in [lib.filebuf.members]/2.
	78	static const char*
	79	fopen_mode(std::ios_base::openmode mode)
	80	{
f92ab29f	81	enum
6a734d61 BK	82	{
	83	in = std::ios_base::in,
	84	out = std::ios_base::out,
	85	trunc = std::ios_base::trunc,
	86	app = std::ios_base::app,
a219139e JW	87	binary = std::ios_base::binary,
a219139e JW	88	noreplace = std::_S_noreplace
6a734d61	89	};
ec01f292 PC	90
	91	// _GLIBCXX_RESOLVE_LIB_DEFECTS
	92	// 596. 27.8.1.3 Table 112 omits "a+" and "a+b" modes.
a219139e	93	switch (mode & (in\|out\|trunc\|app\|binary\|noreplace))
6a734d61	94	{
a219139e JW	95	case ( out ): return "w";
	96	case ( out \|noreplace): return "wx";
	97	case ( out\|trunc ): return "w";
	98	case ( out\|trunc \|noreplace): return "wx";
	99	case ( out \|app ): return "a";
	100	case ( app ): return "a";
	101	case (in ): return "r";
	102	case (in\|out ): return "r+";
	103	case (in\|out\|trunc ): return "w+";
	104	case (in\|out\|trunc \|noreplace): return "w+x";
	105	case (in\|out \|app ): return "a+";
	106	case (in \|app ): return "a+";
	107
	108	case ( out \|binary ): return "wb";
	109	case ( out \|binary\|noreplace): return "wbx";
	110	case ( out \|app\|binary ): return "ab";
	111	case ( app\|binary ): return "ab";
	112	case ( out\|trunc \|binary ): return "wb";
	113	case (in \|binary ): return "rb";
	114	case (in\|out \|binary ): return "r+b";
	115	case (in\|out\|trunc \|binary ): return "w+b";
	116	case (in\|out\|trunc \|binary\|noreplace): return "w+bx";
	117	case (in\|out \|app\|binary ): return "a+b";
	118	case (in \|app\|binary ): return "a+b";
ec01f292	119
6a734d61 BK	120	default: return 0; // invalid
	121	}
	122	}
2e9a1f6b PC	123
	124	// Wrapper handling partial write.
	125	static std::streamsize
75aee072 KP	126	#ifdef _GLIBCXX_USE_STDIO_PURE
	127	xwrite(FILE __file, const char __s, std::streamsize __n)
	128	#else
2e9a1f6b	129	xwrite(int __fd, const char* __s, std::streamsize __n)
75aee072	130	#endif
2e9a1f6b PC	131	{
2e9a1f6b PC	132	std::streamsize __nleft = __n;
94b8de97 PC	133
94b8de97 PC	134	for (;;)
2e9a1f6b	135	{
75aee072	136	#ifdef _GLIBCXX_USE_STDIO_PURE
bb4f8f14	137	const std::streamsize __ret = fwrite(__s, 1, __nleft, __file);
2f6bbc9a JW	138	if (__ret == 0 && ferror(__file))
2f6bbc9a JW	139	break;
75aee072	140	#else
2e9a1f6b PC	141	const std::streamsize __ret = write(__fd, __s, __nleft);
	142	if (__ret == -1L && errno == EINTR)
	143	continue;
94b8de97	144	if (__ret == -1L)
2e9a1f6b	145	break;
2f6bbc9a	146	#endif
2e9a1f6b	147	__nleft -= __ret;
94b8de97 PC	148	if (__nleft == 0)
	149	break;
	150
2e9a1f6b PC	151	__s += __ret;
2e9a1f6b PC	152	}
94b8de97	153
2e9a1f6b PC	154	return __n - __nleft;
	155	}
	156
75aee072	157	#if defined(_GLIBCXX_HAVE_WRITEV) && !defined(_GLIBCXX_USE_STDIO_PURE)
2e9a1f6b PC	158	// Wrapper handling partial writev.
	159	static std::streamsize
	160	xwritev(int __fd, const char* __s1, std::streamsize __n1,
	161	const char* __s2, std::streamsize __n2)
	162	{
94b8de97 PC	163	std::streamsize __nleft = __n1 + __n2;
94b8de97 PC	164	std::streamsize __n1_left = __n1;
2e9a1f6b PC	165
2e9a1f6b PC	166	struct iovec __iov[2];
2e9a1f6b PC	167	__iov[1].iov_base = const_cast<char*>(__s2);
	168	__iov[1].iov_len = __n2;
	169
94b8de97	170	for (;;)
2e9a1f6b	171	{
94b8de97 PC	172	__iov[0].iov_base = const_cast<char*>(__s1);
	173	__iov[0].iov_len = __n1_left;
	174
	175	const std::streamsize __ret = writev(__fd, __iov, 2);
	176	if (__ret == -1L && errno == EINTR)
	177	continue;
	178	if (__ret == -1L)
	179	break;
	180
	181	__nleft -= __ret;
	182	if (__nleft == 0)
	183	break;
	184
	185	const std::streamsize __off = __ret - __n1_left;
	186	if (__off >= 0)
2e9a1f6b	187	{
94b8de97 PC	188	__nleft -= xwrite(__fd, __s2 + __off, __n2 - __off);
94b8de97 PC	189	break;
2e9a1f6b	190	}
f92ab29f	191
94b8de97 PC	192	__s1 += __ret;
94b8de97 PC	193	__n1_left -= __ret;
2e9a1f6b PC	194	}
2e9a1f6b PC	195
94b8de97	196	return __n1 + __n2 - __nleft;
2e9a1f6b PC	197	}
2e9a1f6b PC	198	#endif
c1a03f03	199	} // anonymous namespace
6a734d61	200
3cbc7af0	201
12ffa228 BK	202	namespace std _GLIBCXX_VISIBILITY(default)
	203	{
	204	_GLIBCXX_BEGIN_NAMESPACE_VERSION
3cbc7af0	205
00532602	206	// Definitions for __basic_file<char>.
32ade559	207	__basic_file<char>::__basic_file(__c_lock* /__lock/) throw()
00532602 BK	208	: _M_cfile(NULL), _M_cfile_created(false) { }
	209
	210	__basic_file<char>::~__basic_file()
d3a193e3	211	{ this->close(); }
f92ab29f	212
00532602	213	__basic_file<char>*
f92ab29f	214	__basic_file<char>::sys_open(__c_file* __file, ios_base::openmode)
00532602 BK	215	{
	216	__basic_file* __ret = NULL;
	217	if (!this->is_open() && __file)
	218	{
04d07b61 JW	219	int __err, __save_errno = errno;
04d07b61 JW	220	// POSIX guarantees that fflush sets errno on error, but C doesn't.
f92ab29f	221	errno = 0;
ce894603	222	do
04d07b61	223	__err = fflush(__file);
ce894603	224	while (__err && errno == EINTR);
04d07b61	225	errno = __save_errno;
ce894603 PC	226	if (!__err)
	227	{
	228	_M_cfile = __file;
	229	_M_cfile_created = false;
	230	__ret = this;
	231	}
5cdd50a5 BK	232	}
	233	return __ret;
	234	}
f92ab29f	235
5cdd50a5	236	__basic_file<char>*
b91cc3b9	237	__basic_file<char>::sys_open(int __fd, ios_base::openmode __mode) throw ()
5cdd50a5 BK	238	{
5cdd50a5 BK	239	__basic_file* __ret = NULL;
c1a03f03	240	const char* __c_mode = fopen_mode(__mode);
563ae04f	241	if (__c_mode && !this->is_open() && (_M_cfile = fdopen(__fd, __c_mode)))
5cdd50a5	242	{
563ae04f	243	char* __buf = NULL;
e80213d2	244	_M_cfile_created = true;
5cdd50a5	245	if (__fd == 0)
563ae04f	246	setvbuf(_M_cfile, __buf, _IONBF, 0);
00532602 BK	247	__ret = this;
	248	}
	249	return __ret;
	250	}
f92ab29f CG	251
	252	__basic_file<char>*
	253	__basic_file<char>::open(const char* __name, ios_base::openmode __mode,
00532602 BK	254	int /__prot/)
	255	{
	256	__basic_file* __ret = NULL;
c1a03f03	257	const char* __c_mode = fopen_mode(__mode);
6a734d61	258	if (__c_mode && !this->is_open())
00532602 BK	259	{
	260	if ((_M_cfile = fopen(__name, __c_mode)))
	261	{
	262	_M_cfile_created = true;
	263	__ret = this;
	264	}
	265	}
	266	return __ret;
	267	}
f92ab29f	268
b0292359 JW	269	#if _GLIBCXX_HAVE__WFOPEN && _GLIBCXX_USE_WCHAR_T
	270	__basic_file<char>*
	271	__basic_file<char>::open(const wchar_t* __name, ios_base::openmode __mode)
	272	{
	273	__basic_file* __ret = NULL;
	274	const char* __c_mode = fopen_mode(__mode);
	275	if (__c_mode && !this->is_open())
	276	{
	277	wchar_t __wc_mode[4] = { };
	278	int __i = 0;
	279	do
	280	{
	281	switch(__c_mode[__i]) {
	282	case 'a': __wc_mode[__i] = L'a'; break;
	283	case 'b': __wc_mode[__i] = L'b'; break;
	284	case 'r': __wc_mode[__i] = L'r'; break;
	285	case 'w': __wc_mode[__i] = L'w'; break;
	286	case '+': __wc_mode[__i] = L'+'; break;
	287	default: return __ret;
	288	}
	289	}
	290	while (__c_mode[++__i]);
	291
	292	if ((_M_cfile = _wfopen(__name, __wc_mode)))
	293	{
	294	_M_cfile_created = true;
	295	__ret = this;
	296	}
	297	}
	298	return __ret;
	299	}
	300	#endif
	301
f92ab29f	302	bool
b91cc3b9	303	__basic_file<char>::is_open() const throw ()
5cdd50a5	304	{ return _M_cfile != 0; }
f92ab29f	305
75aee072	306	#ifndef _GLIBCCXX_USE_STDIO_PURE
f92ab29f	307	int
b91cc3b9	308	__basic_file<char>::fd() throw ()
803cb0b5	309	{ return fileno(_M_cfile); }
75aee072	310	#endif
f92ab29f	311
803cb0b5	312	__c_file*
b91cc3b9	313	__basic_file<char>::file() throw ()
803cb0b5	314	{ return _M_cfile; }
f92ab29f CG	315
f92ab29f CG	316	__basic_file<char>*
00532602	317	__basic_file<char>::close()
f92ab29f	318	{
e80213d2	319	__basic_file* __ret = static_cast<__basic_file*>(NULL);
d3a193e3 BK	320	if (this->is_open())
d3a193e3 BK	321	{
ee19761d	322	int __err = 0;
e6670c79	323	if (_M_cfile_created)
0fdba3a8	324	__err = fclose(_M_cfile);
ee19761d	325	_M_cfile = 0;
ce894603 PC	326	if (!__err)
ce894603 PC	327	__ret = this;
d3a193e3	328	}
e80213d2	329	return __ret;
00532602	330	}
f92ab29f CG	331
f92ab29f CG	332	streamsize
51ff8149	333	__basic_file<char>::xsgetn(char* __s, streamsize __n)
69ef29fd BK	334	{
69ef29fd BK	335	streamsize __ret;
75aee072	336	#ifdef _GLIBCXX_USE_STDIO_PURE
2f6bbc9a JW	337	__ret = fread(__s, 1, __n, this->file());
	338	if (__ret == 0 && ferror(this->file()))
	339	__ret = -1;
75aee072	340	#else
2f6bbc9a	341	do
69ef29fd BK	342	__ret = read(this->fd(), __s, __n);
69ef29fd BK	343	while (__ret == -1L && errno == EINTR);
2f6bbc9a	344	#endif
69ef29fd BK	345	return __ret;
69ef29fd BK	346	}
98e96784	347
f92ab29f	348	streamsize
98e96784	349	__basic_file<char>::xsputn(const char* __s, streamsize __n)
75aee072 KP	350	{
	351	#ifdef _GLIBCXX_USE_STDIO_PURE
	352	return xwrite(this->file(), __s, __n);
	353	#else
	354	return xwrite(this->fd(), __s, __n);
	355	#endif
	356	}
cc5112c9	357
f92ab29f	358	streamsize
bda243ec PC	359	__basic_file<char>::xsputn_2(const char* __s1, streamsize __n1,
	360	const char* __s2, streamsize __n2)
	361	{
	362	streamsize __ret = 0;
75aee072	363	#if defined(_GLIBCXX_HAVE_WRITEV) && !defined(_GLIBCXX_USE_STDIO_PURE)
c1a03f03	364	__ret = xwritev(this->fd(), __s1, __n1, __s2, __n2);
bda243ec PC	365	#else
bda243ec PC	366	if (__n1)
75aee072 KP	367	#ifdef _GLIBCXX_USE_STDIO_PURE
	368	__ret = xwrite(this->file(), __s1, __n1);
	369	#else
c1a03f03	370	__ret = xwrite(this->fd(), __s1, __n1);
75aee072	371	#endif
bda243ec PC	372
bda243ec PC	373	if (__ret == __n1)
75aee072 KP	374	#ifdef _GLIBCXX_USE_STDIO_PURE
	375	__ret += xwrite(this->file(), __s2, __n2);
	376	#else
c1a03f03	377	__ret += xwrite(this->fd(), __s2, __n2);
75aee072	378	#endif
bda243ec PC	379	#endif
	380	return __ret;
	381	}
	382
2f6bbc9a JW	383	namespace
	384	{
	385	inline streamoff
	386	get_file_offset(__basic_file<char>* __f)
	387	{
	388	#ifdef _GLIBCXX_USE_STDIO_PURE
	389	# ifdef _GLIBCXX_USE_FSEEKO_FTELLO
	390	return ftello(__f->file());
	391	# else
	392	return ftell(__f->file());
	393	# endif
2f6bbc9a JW	394	#else
	395	return lseek(__f->fd(), 0, (int)ios_base::cur);
	396	#endif
	397	}
	398	}
	399
4c4809c1	400	streamoff
b91cc3b9	401	__basic_file<char>::seekoff(streamoff __off, ios_base::seekdir __way) throw ()
3d05b345	402	{
2f6bbc9a JW	403	#ifdef _GLIBCXX_USE_STDIO_PURE
	404	#ifdef _GLIBCXX_USE_FSEEKO_FTELLO
	405	if _GLIBCXX17_CONSTEXPR (sizeof(off_t) > sizeof(long))
	406	{
	407	if (fseeko(this->file(), __off, __way))
	408	return -1;
	409	}
	410	else
	411	#endif
	412	{
	413	if (__off > numeric_limits<long>::max()
	414	\|\| __off < numeric_limits<long>::min())
	415	return -1;
	416	if (fseek(this->file(), __off, __way))
	417	return -1;
	418	}
	419	return __way == ios_base::beg ? __off : std::get_file_offset(this);
3d05b345	420	#else
61fe96d4 JW	421	if _GLIBCXX17_CONSTEXPR (sizeof(streamoff) > sizeof(off_t))
	422	if (__off > numeric_limits<off_t>::max()
	423	\|\| __off < numeric_limits<off_t>::min())
3d05b345 PC	424	return -1L;
	425	return lseek(this->fd(), __off, __way);
	426	#endif
	427	}
cc5112c9	428
f92ab29f CG	429	int
f92ab29f CG	430	__basic_file<char>::sync()
5cdd50a5	431	{ return fflush(_M_cfile); }
bbacb998 PC	432
bbacb998 PC	433	streamsize
51ff8149	434	__basic_file<char>::showmanyc()
bbacb998	435	{
75aee072	436	#if !defined(_GLIBCXX_NO_IOCTL) && !defined(_GLIBCXX_USE_STDIO_PURE)
bbacb998	437	#ifdef FIONREAD
f92ab29f	438	// Pipes and sockets.
bbacb998 PC	439	int __num = 0;
	440	int __r = ioctl(this->fd(), FIONREAD, &__num);
	441	if (!__r && __num >= 0)
f92ab29f	442	return __num;
266afdd6 KT	443	#endif
266afdd6 KT	444	#endif
bbacb998	445
75aee072	446	#if defined(_GLIBCXX_HAVE_POLL) && !defined(_GLIBCXX_USE_STDIO_PURE)
bbacb998 PC	447	// Cheap test.
	448	struct pollfd __pfd[1];
	449	__pfd[0].fd = this->fd();
	450	__pfd[0].events = POLLIN;
	451	if (poll(__pfd, 1, 0) <= 0)
	452	return 0;
f92ab29f	453	#endif
bbacb998	454
3d7c150e	455	#if defined(_GLIBCXX_HAVE_S_ISREG) \|\| defined(_GLIBCXX_HAVE_S_IFREG)
bbacb998	456	// Regular files.
61fe96d4 JW	457	struct stat __buffer;
61fe96d4 JW	458	const int __err = fstat(this->fd(), &__buffer);
dd5d134b PC	459	if (!__err && _GLIBCXX_ISREG(__buffer.st_mode))
dd5d134b PC	460	{
2f6bbc9a	461	const streamoff __off = __buffer.st_size - std::get_file_offset(this);
dd5d134b PC	462	return std::min(__off, streamoff(numeric_limits<streamsize>::max()));
dd5d134b PC	463	}
bbacb998 PC	464	#endif
	465	return 0;
	466	}
3cbc7af0	467
c4baeaec JW	468	__basic_file<char>::native_handle_type
	469	__basic_file<char>::native_handle() const noexcept
	470	{
	471	#ifdef _GLIBCXX_USE_STDIO_PURE
	472	return _M_cfile;
	473	#elif _GLIBCXX_USE__GET_OSFHANDLE
	474	const intptr_t handle = _M_cfile ? _get_osfhandle(fileno(_M_cfile)) : -1;
29ad35a1	475	return reinterpret_cast<native_handle_type>(handle);
c4baeaec JW	476	#else
	477	return fileno(_M_cfile);
	478	#endif
	479	}
	480
12ffa228 BK	481	_GLIBCXX_END_NAMESPACE_VERSION
12ffa228 BK	482	} // namespace
3cbc7af0	483