workbench/libs/nonvolatile/nvdisk/meminfonvd.c

   1 /*
   2     Copyright © 1995-2001, The AROS Development Team. All rights reserved.
   3     $Id$
   4
   5     Desc:
   6     Lang: English
   7 */
   8
   9 /*****************************************************************************
  10
  11     NAME */
  12
  13 #include "nvdisk_intern.h"
  14 #include <dos/dos.h>
  15 #include <proto/dos.h>
  16 #include <libraries/nonvolatile.h>
  17
  18
  19 AROS_LH1(BOOL, MemInfoNVD,
  20
  21 /*  SYNOPSIS */
  22
  23         AROS_LHA(struct NVInfo *, nvInfo, A0),
  24
  25 /*  LOCATION */
  26
  27         struct Library *, nvdBase, 8, NVDisk)
  28
  29 /*  FUNCTION
  30
  31     Return the information associated with the nonvolatile memory.
  32
  33     INPUTS
  34
  35     nvInfo  --  information structure to be filled by this function
  36
  37     RESULT
  38
  39     The 'nvInfo' structure will be filled with the appropriate values. In
  40     case of failure, NULL will be returned.
  41
  42     NOTES
  43
  44     EXAMPLE
  45
  46     BUGS
  47
  48     SEE ALSO
  49
  50     INTERNALS
  51
  52     3 blocks of free space are not reported as free, as it may be strange
  53     for a user that queries the available storage memory, finds out that
  54     free memory exists but still gets errors when using StoreNV() as the
  55     memory was used for directory purposes.
  56
  57     HISTORY
  58
  59     November 2000,  SDuvan  --  implemented
  60
  61 ******************************************************************************/
  62
  63 {
  64     AROS_LIBFUNC_INIT
  65
  66     struct InfoData info;
  67
  68     if(Info(GPB(nvdBase)->nvd_location, &info))
  69     {
  70         nvInfo->nvi_MaxStorage = info.id_NumBlocks*info.id_BytesPerBlock;
  71
  72         /* 3 blocks are subtracted at it may be the case a new application wants
  73            to store a new item. Then the 'appName' directory will take one block,
  74            the new file will take at least one block and possibly a new directory
  75            block may need to be created containing the 'appName' directory */
  76
  77         if(info.id_NumBlocks < 3)
  78             nvInfo->nvi_FreeStorage = 0;
  79         else
  80         {
  81             nvInfo->nvi_FreeStorage =
  82                 (info.id_NumBlocks - info.id_NumBlocksUsed - 3)*info.id_BytesPerBlock;
  83         }
  84     }
  85     else
  86         return FALSE;
  87
  88     return TRUE;
  89
  90     AROS_LIBFUNC_EXIT
  91 } /* MemInfo */