/*
 * hb_UserName() function
 *
 * Copyright 1999-2001 Viktor Szakats (vszakats.net/harbour)
 *
 * 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 2, 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; see the file LICENSE.txt.  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301 USA (or visit https://www.gnu.org/licenses/).
 *
 * As a special exception, the Harbour Project gives permission for
 * additional uses of the text contained in its release of Harbour.
 *
 * The exception is that, if you link the Harbour libraries with other
 * files to produce an executable, this does not by itself cause the
 * resulting executable to be covered by the GNU General Public License.
 * Your use of that executable is in no way restricted on account of
 * linking the Harbour library code into it.
 *
 * This exception does not however invalidate any other reasons why
 * the executable file might be covered by the GNU General Public License.
 *
 * This exception applies only to the code released by the Harbour
 * Project under the name Harbour.  If you copy code from other
 * Harbour Project or Free Software Foundation releases into a copy of
 * Harbour, as the General Public License permits, the exception does
 * not apply to the code that you add in this way.  To avoid misleading
 * anyone as to the status of such modified files, you must delete
 * this exception notice from them.
 *
 * If you write modifications of your own for Harbour, it is your choice
 * whether to permit this exception to apply to your modifications.
 * If you do not wish that, delete this exception notice.
 *
 */

#include "hbapi.h"

#if defined( HB_OS_WIN )

   #include <windows.h>
   #include "hbwinuni.h"
   #if defined( HB_OS_WIN_CE )
      #include "hbwince.h"
   #endif

#elif defined( HB_OS_OS2 ) && defined( __GNUC__ )

   #include "hb_io.h"

   /* 2004-03-25 - <maurilio.longo@libero.it>
      not needed anymore as of GCC 3.2.2 */

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

   #if defined( __EMX__ ) && __GNUC__ * 1000 + __GNUC_MINOR__ < 3002
      #include <emx/syscalls.h>
   #endif
   #define HB_HAS_PWD

#elif defined( HB_OS_UNIX ) && ! defined( HB_OS_VXWORKS ) && ! defined( __WATCOMC__ )

   #include <pwd.h>
   #include <sys/types.h>
   #include <unistd.h>
   #define HB_HAS_PWD

#endif

/* NOTE: The caller must free the returned buffer. [vszakats] */

char * hb_username( void )
{
#if defined( HB_OS_WIN )

   DWORD dwLen = 256;
   TCHAR lpValue[ 256 ];

   lpValue[ 0 ] = TEXT( '\0' );
   GetUserName( lpValue, &dwLen );
   lpValue[ 255 ] = TEXT( '\0' );

   if( lpValue[ 0 ] )
      return HB_OSSTRDUP( lpValue );

#elif defined( HB_HAS_PWD )

   struct passwd * pwd = getpwuid( getuid() );
   if( pwd && pwd->pw_name )
      return hb_osStrDecode( pwd->pw_name );

#endif

   return hb_getenv( "USER" );
}

HB_FUNC( HB_USERNAME )
{
   char * buffer = hb_username();

   if( buffer )
      hb_retc_buffer( buffer );
   else
      hb_retc_null();
}