/************************************************************************
 * EOS - the CERN Disk Storage System                                   *
 * Copyright (C) 2018 CERN/Switzerland                                  *
 *                                                                      *
 * This program 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.                                  *
 *                                                                      *
 * This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.*
 ************************************************************************/

//------------------------------------------------------------------------------
// author: Georgios Bitzes <georgios.bitzes@cern.ch>
// desc:   Namespace mode utilities
//------------------------------------------------------------------------------

#pragma once
#include "common/Logging.hh"

#define S_XATTR 0xa0000000

namespace eos
{
//------------------------------------------------------------------------------
//! Convert mode to its corresponding character in a listing.
//! eg S_IFDIR is converted to 'd'
//------------------------------------------------------------------------------
inline char modeToFileTypeChar(mode_t mode)
{
  unsigned int filetype = S_IFMT & mode;

  switch (filetype) {
  case S_IFIFO:
    return 'p';

  case S_IFCHR:
    return 'c';

  case S_IFDIR:
    return 'd';

  case S_IFBLK:
    return 'b';

  case S_IFREG:
    return '-';

  case S_IFLNK:
    return 'l';

  case S_IFSOCK:
    return 's';

  default: {
    // TODO(gbitzes): Eventually convert this to an assertion?
    eos_static_crit(
      "Unable to translate mode to filetype char. mode=%d, filetype=%d",
      mode, filetype);
    return '-';
  }
  }
}

inline void modeToBuffer(mode_t mode, char* modestr)
{
  // TODO(gbitzes): This method is very branchy. It might make sense to put
  // all possible values into a map, and simply look up the resulting string.
  strcpy(modestr, "----------");
  modestr[0] = modeToFileTypeChar(mode);

  if (mode & S_IRUSR) {
    modestr[1] = 'r';
  }

  if (mode & S_IWUSR) {
    modestr[2] = 'w';
  }

  if (mode & S_IXUSR) {
    modestr[3] = 'x';
  }

  if (mode & S_IRGRP) {
    modestr[4] = 'r';
  }

  if (mode & S_IWGRP) {
    modestr[5] = 'w';
  }

  if (mode & S_IXGRP) {
    modestr[6] = 'x';
  }
  
  if (mode & S_IROTH) {
    modestr[7] = 'r';
  }
  
  if (mode & S_IWOTH) {
    modestr[8] = 'w';
  }

  if (mode & S_IXOTH) {
    modestr[9] = 'x';
  }

  if (mode & S_ISVTX) {
    if (mode & S_XATTR) {
      modestr[9] = 'T';
    } else {
      modestr[9] = 't';
    }
  } else {
    if (mode & S_XATTR) {
      modestr[9] = '+';
    }
  }

  if (mode & S_ISUID) {
    modestr[3] = 's';
  }

  if (mode & S_ISGID) {
    modestr[6] = 's';
  }
}
}