//  This may look like C code, but it is really -*- C++ -*-

//  ------------------------------------------------------------------
//  The Goldware Library
//  Copyright (C) 1990-1999 Odinn Sorensen
//  Copyright (C) 1999-2000 Alexander S. Aganichev
//  ------------------------------------------------------------------
//  This library is free software; you can redistribute it and/or
//  modify it under the terms of the GNU Library General Public
//  License as published by the Free Software Foundation; either
//  version 2 of the License, 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
//  Library General Public License for more details.
//
//  You should have received a copy of the GNU Library General Public
//  License along with this program; if not, write to the Free
//  Software Foundation, Inc., 59 Temple Place, Suite 330, Boston,
//  MA 02111-1307, USA
//  ------------------------------------------------------------------
//  $Id$
//  ------------------------------------------------------------------
//  Ports of OS-specific file/path functions.
//  ------------------------------------------------------------------

#include <gfilutil.h>

#if defined(__OS2__)
#define INCL_BASE
#define INCL_ERROR_H
#include <os2.h>
#endif

#if defined(__WIN32__)
#include <windows.h>
#endif

#if defined(__CYGWIN__)
#include <io.h>
#endif

#if defined(__MINGW32__)
#include <sys/locking.h>
#endif

#if defined(__BEOS__)
#include "be_lock.h"
#endif


//  ------------------------------------------------------------------

#ifdef __cplusplus
extern "C" {
#endif


//  ------------------------------------------------------------------

#if !defined(__DJGPP__) && ((defined(__BORLANDC__) && defined(__OS2__)) || defined(__UNIX__) || defined(__EMX__))

off_t filelength(int handle) {

  struct stat s;
  if(fstat(handle, &s) == 0)
    return s.st_size;
  else
    return -1;
}

#endif


//  ------------------------------------------------------------------

#if defined(__OS2__)

int lock(int handle, long ofs, long length)
{
  int rc;
  APIRET apiret;
  FILELOCK urange, lrange;

  lrange.lOffset = ofs;
  lrange.lRange = length;
  urange.lRange = urange.lOffset = 0;

  if((apiret = DosSetFileLocks((HFILE)handle, &urange, &lrange, 0, 0)) != 0) {
    if(apiret == ERROR_LOCK_VIOLATION) {
      errno = EACCES;
      rc = -1;
    }
    else
      rc = (int)apiret;
  }
  else
    rc = 0;

  return rc;
}

#endif


//  ------------------------------------------------------------------

#if defined(__OS2__)

int unlock(int handle, long ofs, long length)
{
  int rc;
  FILELOCK urange, lrange;
  APIRET apiret;

  urange.lOffset = ofs;
  urange.lRange = length;
  lrange.lRange = lrange.lOffset = 0;

  if((apiret = DosSetFileLocks((HFILE)handle, &urange, &lrange, 0, 0)) != 0) {
    if(apiret == ERROR_LOCK_VIOLATION) {
      errno = EACCES;
      rc = -1;
    }
    else
      rc = apiret;
  }
  else
    rc = 0;

  return rc;
}

#endif


//  ------------------------------------------------------------------

#if defined(__UNIX__) || defined(__CYGWIN__) 

int lock(int handle, long offset, long length) {

#ifndef __BEOS__
  struct flock fl;
  fl.l_type = F_WRLCK;
  fl.l_whence = SEEK_SET;
  fl.l_start = offset;
  fl.l_len = length;

  return fcntl(handle, F_SETLK, &fl);
#else //__BEOS__
  return be_lock(handle);
#endif  
}

#endif


//  ------------------------------------------------------------------

#if defined(__UNIX__) || defined(__CYGWIN__)

int unlock(int handle, long offset, long length) {

#ifndef __BEOS__
  struct flock fl;
  fl.l_type = F_UNLCK;
  fl.l_whence = SEEK_SET;
  fl.l_start = offset;
  fl.l_len = length;

  return fcntl(handle, F_SETLK, &fl);
#else //__BEOS__
  return be_unlock(handle);
#endif //__BEOS__
}

#endif


//  ------------------------------------------------------------------

#if defined(__MINGW32__) || defined(_MSC_VER)

int lock(int fh, long offs, long len) {

  if(LockFile((HANDLE)_get_osfhandle(fh), offs, 0L, len, 0L)) return 0;
  else return -1;
}
 
#endif


//  ------------------------------------------------------------------

#if defined(__MINGW32__) || defined(_MSC_VER)

int unlock(int fh, long offs, long len) {

  if(UnlockFile((HANDLE)_get_osfhandle(fh), offs, 0L, len, 0L)) return 0;
  else return -1;
}

#endif


//  ------------------------------------------------------------------

#ifdef __cplusplus
}
#endif


//  ------------------------------------------------------------------