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

// Copyright (C) 2000, 2001, 2002, 2003, 2004, 2006, 2007, 2009, 2010

// 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/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()

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

      };

    // _GLIBCXX_RESOLVE_LIB_DEFECTS

    // 596. 27.8.1.3 Table 112 omits "a+" and "a+b" modes.

    switch (mode & (in|out|trunc|app|binary))

      {

      case (   out                 ): return "w";

      case (   out      |app       ): return "a";

      case (             app       ): return "a";

      case (   out|trunc           ): return "w";

      case (in                     ): return "r";

      case (in|out                 ): return "r+";

      case (in|out|trunc           ): return "w+";

      case (in|out      |app       ): return "a+";

      case (in          |app       ): return "a+";

      case (   out          |binary): return "wb";

      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      |app|binary): return "a+b";

      case (in          |app|binary): return "a+b";

      default: return 0; // invalid

      }

  }

  // Wrapper handling partial write.

  static std::streamsize

  xwrite(int __fd, const char* __s, std::streamsize __n)

  {

    std::streamsize __nleft = __n;

    for (;;)

      {

        const std::streamsize __ret = write(__fd, __s, __nleft);

        if (__ret == -1L && errno == EINTR)

          continue;

        if (__ret == -1L)

          break;

        __nleft -= __ret;

        if (__nleft == 0)

          break;

        __s += __ret;

      }

    return __n - __nleft;

  }

#ifdef _GLIBCXX_HAVE_WRITEV

  // 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

_GLIBCXX_BEGIN_NAMESPACE(std)

  // 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;

        errno = 0;

        do

          __err = this->sync();

        while (__err && errno == EINTR);

        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())

      {

#ifdef _GLIBCXX_USE_LFS

        if ((_M_cfile = fopen64(__name, __c_mode)))

#else

        if ((_M_cfile = fopen(__name, __c_mode)))

#endif

          {

            _M_cfile_created = true;

            __ret = this;

          }

      }

    return __ret;

  }

  bool

  __basic_file<char>::is_open() const throw ()

  { return _M_cfile != 0; }

  int

  __basic_file<char>::fd() throw ()

  { return fileno(_M_cfile); }

  __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)

          {

            // In general, no need to zero errno in advance if checking

            // for error first. However, C89/C99 (at variance with IEEE

            // 1003.1, f.i.) do not mandate that fclose must set errno

            // upon error.

            errno = 0;

            do

              __err = fclose(_M_cfile);

            while (__err && errno == EINTR);

          }

        _M_cfile = 0;

        if (!__err)

          __ret = this;

      }

    return __ret;

  }

  streamsize

  __basic_file<char>::xsgetn(char* __s, streamsize __n)

  {

    streamsize __ret;

    do

      __ret = read(this->fd(), __s, __n);

    while (__ret == -1L && errno == EINTR);

    return __ret;

  }

  streamsize

  __basic_file<char>::xsputn(const char* __s, streamsize __n)

  { return xwrite(this->fd(), __s, __n); }

  streamsize

  __basic_file<char>::xsputn_2(const char* __s1, streamsize __n1,

                               const char* __s2, streamsize __n2)

  {

    streamsize __ret = 0;

#ifdef _GLIBCXX_HAVE_WRITEV

    __ret = xwritev(this->fd(), __s1, __n1, __s2, __n2);

#else

    if (__n1)

      __ret = xwrite(this->fd(), __s1, __n1);

    if (__ret == __n1)

      __ret += xwrite(this->fd(), __s2, __n2);

#endif

    return __ret;

  }

  streamoff

  __basic_file<char>::seekoff(streamoff __off, ios_base::seekdir __way) throw ()

  {

#ifdef _GLIBCXX_USE_LFS

    return lseek64(this->fd(), __off, __way);

#else

    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()

  {

#ifdef FIONREAD

    // Pipes and sockets.    

#ifdef _GLIBCXX_FIONREAD_TAKES_OFF_T

    off_t __num = 0;

#else

    int __num = 0;

#endif

    int __r = ioctl(this->fd(), FIONREAD, &__num);

    if (!__r && __num >= 0)

      return __num;

#endif    

#ifdef _GLIBCXX_HAVE_POLL

    // 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.

#ifdef _GLIBCXX_USE_LFS

    struct stat64 __buffer;

    const int __err = fstat64(this->fd(), &__buffer);

    if (!__err && _GLIBCXX_ISREG(__buffer.st_mode))

      {

        const streamoff __off = __buffer.st_size - lseek64(this->fd(), 0,

                                                           ios_base::cur);

        return std::min(__off, streamoff(numeric_limits<streamsize>::max()));

      }

#else

    struct stat __buffer;

    const int __err = fstat(this->fd(), &__buffer);

    if (!__err && _GLIBCXX_ISREG(__buffer.st_mode))

      return __buffer.st_size - lseek(this->fd(), 0, ios_base::cur);

#endif

#endif

    return 0;

  }

_GLIBCXX_END_NAMESPACE