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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.  
  40. /*
  41.     DWORD SetFilePointer(
  42.       HANDLE hFile,                // handle to file
  43.       LONG lDistanceToMove,        // bytes to move pointer
  44.       PLONG lpDistanceToMoveHigh,  // bytes to move pointer
  45.       DWORD dwMoveMethod           // starting point
  46.     );
  47.  */
  48.  
  49. #ifndef INVALID_SET_FILE_POINTER
  50. #define INVALID_SET_FILE_POINTER 0xFFFFFFFF
  51. #endif
  52.  
  53. typedef struct
  54. {
  55.   char     *name;
  56.   unsigned int offset;
  57. }__file_handle;
  58.  
  59. typedef struct
  60. {   DWORD    attr;
  61.     DWORD    flags;
  62.     DWORD    cr_time;
  63.     DWORD    cr_date;
  64.     DWORD    acc_time;
  65.     DWORD    acc_date;
  66.     DWORD    mod_time;
  67.     DWORD    mod_date;
  68.     DWORD    size;
  69.     DWORD    size_high;
  70. } FILEINFO;
  71.  
  72. int _stdcall get_fileinfo(const char *name,FILEINFO* pinfo);
  73.  
  74. _WCRTLINK long __lseek( int hid, long offset, int origin )
  75. {
  76.     __file_handle *fh;
  77.     long rc;
  78.    
  79.     __handle_check( hid, -1 );
  80.     fh = (__file_handle*) __getOSHandle( hid );
  81.  
  82.     switch(origin)
  83.     {
  84.       case SEEK_SET:
  85.         rc = offset;
  86.         break;
  87.       case SEEK_CUR:  
  88.         rc = fh->offset + offset;
  89.         break;
  90.       case SEEK_END:
  91.       {
  92.         FILEINFO info;
  93.         get_fileinfo(fh->name,&info);
  94.         rc = offset + info.size;
  95.         break;
  96.       }    
  97.       default:
  98.         return -1;
  99.     };
  100.    
  101.     fh->offset = rc;
  102.  
  103.     return( rc );
  104. }
  105.  
  106.