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  1. /****************************************************************************
  2. *
  3. *                            Open Watcom Project
  4. *
  5. *    Portions Copyright (c) 1983-2002 Sybase, Inc. All Rights Reserved.
  6. *
  7. *  ========================================================================
  8. *
  9. *    This file contains Original Code and/or Modifications of Original
  10. *    Code as defined in and that are subject to the Sybase Open Watcom
  11. *    Public License version 1.0 (the 'License'). You may not use this file
  12. *    except in compliance with the License. BY USING THIS FILE YOU AGREE TO
  13. *    ALL TERMS AND CONDITIONS OF THE LICENSE. A copy of the License is
  14. *    provided with the Original Code and Modifications, and is also
  15. *    available at www.sybase.com/developer/opensource.
  16. *
  17. *    The Original Code and all software distributed under the License are
  18. *    distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  19. *    EXPRESS OR IMPLIED, AND SYBASE AND ALL CONTRIBUTORS HEREBY DISCLAIM
  20. *    ALL SUCH WARRANTIES, INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF
  21. *    MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR
  22. *    NON-INFRINGEMENT. Please see the License for the specific language
  23. *    governing rights and limitations under the License.*
  24. *  ========================================================================
  25. *
  26. * Description:  low level lseek without file extend for Windows NT
  27. *
  28. ****************************************************************************/
  29.  
  30.  
  31. #include "variety.h"
  32. #include <stdio.h>
  33. #include <unistd.h>
  34. #include "iomode.h"
  35. #include "rtcheck.h"
  36. #include "seterrno.h"
  37. #include "lseek.h"
  38. #include "handleio.h"
  39. #include "kolibri.h"
  40.  
  41. #ifndef INVALID_SET_FILE_POINTER
  42. #define INVALID_SET_FILE_POINTER 0xFFFFFFFF
  43. #endif
  44.  
  45. typedef struct
  46. {
  47.   char     *name;
  48.   unsigned int offset;
  49. }__file_handle;
  50.  
  51. _WCRTLINK long __lseek( int hid, long offset, int origin )
  52. {
  53.     __file_handle *fh;
  54.     long rc;
  55.    
  56.     __handle_check( hid, -1 );
  57.     fh = (__file_handle*) __getOSHandle( hid );
  58.  
  59.     switch(origin)
  60.     {
  61.       case SEEK_SET:
  62.         rc = offset;
  63.         break;
  64.       case SEEK_CUR:  
  65.         rc = fh->offset + offset;
  66.         break;
  67.       case SEEK_END:
  68.       {
  69.         FILEINFO info;
  70.         get_fileinfo(fh->name,&info);
  71.         rc = offset + info.size;
  72.         break;
  73.       }    
  74.       default:
  75.         return -1;
  76.     };
  77.    
  78.     fh->offset = rc;
  79.  
  80.     return( rc );
  81. }
  82.  
  83.