/*

Copyright (C) 1996-2015 John W. Eaton

This file is part of Octave.

Octave 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 of the License, or (at your
option) any later version.

Octave 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.

You should have received a copy of the GNU General Public License
along with Octave; see the file COPYING.  If not, see
<http://www.gnu.org/licenses/>.

*/

#ifdef HAVE_CONFIG_H
#  include <config.h>
#endif

#include <cerrno>
#include <cstring>

#include <sys/types.h>
#include <unistd.h>

#include "filemode.h"

#include "file-ops.h"
#include "file-stat.h"
#include "statdefs.h"

// FIXME: the is_* and mode_as_string functions are only valid
// for initialized objects.  If called for an object that is not
// initialized, they should throw an exception.

bool
base_file_stat::is_blk (void) const
{
  return exists () && is_blk (fs_mode);
}

bool
base_file_stat::is_chr (void) const
{
  return exists () && is_chr (fs_mode);
}

bool
base_file_stat::is_dir (void) const
{
  return exists () && is_dir (fs_mode);
}

bool
base_file_stat::is_fifo (void) const
{
  return exists () && is_fifo (fs_mode);
}

bool
base_file_stat::is_lnk (void) const
{
  return exists () && is_lnk (fs_mode);
}

bool
base_file_stat::is_reg (void) const
{
  return exists () && is_reg (fs_mode);
}

bool
base_file_stat::is_sock (void) const
{
  return exists () && is_sock (fs_mode);
}

bool
base_file_stat::is_blk (mode_t mode)
{
#ifdef S_ISBLK
  return S_ISBLK (mode);
#else
  return false;
#endif
}

bool
base_file_stat::is_chr (mode_t mode)
{
#ifdef S_ISCHR
  return S_ISCHR (mode);
#else
  return false;
#endif
}

bool
base_file_stat::is_dir (mode_t mode)
{
#ifdef S_ISDIR
  return S_ISDIR (mode);
#else
  return false;
#endif
}

bool
base_file_stat::is_fifo (mode_t mode)
{
#ifdef S_ISFIFO
  return S_ISFIFO (mode);
#else
  return false;
#endif
}

bool
base_file_stat::is_lnk (mode_t mode)
{
#ifdef S_ISLNK
  return S_ISLNK (mode);
#else
  return false;
#endif
}

bool
base_file_stat::is_reg (mode_t mode)
{
#ifdef S_ISREG
  return S_ISREG (mode);
#else
  return false;
#endif
}

bool
base_file_stat::is_sock (mode_t mode)
{
#ifdef S_ISSOCK
  return S_ISSOCK (mode);
#else
  return false;
#endif
}

std::string
base_file_stat::mode_as_string (void) const
{
  char buf[12];

  strmode (fs_mode, buf);

  return std::string (buf);
}

// Has FILE been modified since TIME?  Returns 1 for yes, 0 for no,
// and -1 for any error.

int
base_file_stat::is_newer (const std::string& file, const octave_time& time)
{
  file_stat fs (file);

  return fs ? fs.is_newer (time) : -1;
}

// Private stuff:

void
file_stat::update_internal (bool force)
{
  if (! initialized || force)
    {
      initialized = false;
      fail = false;

      std::string full_file_name = file_ops::tilde_expand (file_name);

#if defined (__WIN32__)
      // Remove trailing slash.
      if (file_ops::is_dir_sep (full_file_name[full_file_name.length () - 1])
          && full_file_name.length () != 1
          && ! (full_file_name.length () == 3 && full_file_name[1] == ':'))
        full_file_name.resize (full_file_name.length () - 1);
#endif

      const char *cname = full_file_name.c_str ();

      struct stat buf;

      int status = follow_links
                   ? stat (cname, &buf) : gnulib::lstat (cname, &buf);

      if (status < 0)
        {
          fail = true;
          errmsg = gnulib::strerror (errno);
        }
      else
        {
          fs_mode = buf.st_mode;
          fs_ino = buf.st_ino;
          fs_dev = buf.st_dev;
          fs_nlink = buf.st_nlink;
          fs_uid = buf.st_uid;
          fs_gid = buf.st_gid;
          fs_size = buf.st_size;
          fs_atime = buf.st_atime;
          fs_mtime = buf.st_mtime;
          fs_ctime = buf.st_ctime;

#if defined (HAVE_STRUCT_STAT_ST_RDEV)
          fs_rdev = buf.st_rdev;
#endif

#if defined (HAVE_STRUCT_STAT_ST_BLKSIZE)
          fs_blksize = buf.st_blksize;
#endif

#if defined (HAVE_STRUCT_STAT_ST_BLOCKS)
          fs_blocks = buf.st_blocks;
#endif
        }

      initialized = true;
    }
}

void
file_fstat::update_internal (bool force)
{
  if (! initialized || force)
    {
      initialized = false;
      fail = false;

      struct stat buf;

      int status = gnulib::fstat (fid, &buf);

      if (status < 0)
        {
          fail = true;
          errmsg = gnulib::strerror (errno);
        }
      else
        {
          fs_mode = buf.st_mode;
          fs_ino = buf.st_ino;
          fs_dev = buf.st_dev;
          fs_nlink = buf.st_nlink;
          fs_uid = buf.st_uid;
          fs_gid = buf.st_gid;
          fs_size = buf.st_size;
          fs_atime = buf.st_atime;
          fs_mtime = buf.st_mtime;
          fs_ctime = buf.st_ctime;

#if defined (HAVE_STRUCT_STAT_ST_RDEV)
          fs_rdev = buf.st_rdev;
#endif

#if defined (HAVE_STRUCT_STAT_ST_BLKSIZE)
          fs_blksize = buf.st_blksize;
#endif

#if defined (HAVE_STRUCT_STAT_ST_BLOCKS)
          fs_blocks = buf.st_blocks;
#endif
        }

      initialized = true;
    }
}