rom/dos/exnext.c

   1 /*
   2     Copyright © 1995-2006, The AROS Development Team. All rights reserved.
   3     $Id$
   4
   5     Desc:
   6     Lang: English
   7 */
   8 #include <proto/exec.h>
   9
  10 #include "dos_intern.h"
  11
  12 /*****************************************************************************
  13
  14     NAME */
  15 #include <proto/dos.h>
  16
  17         AROS_LH2(BOOL, ExNext,
  18
  19 /*  SYNOPSIS */
  20         AROS_LHA(BPTR                  , lock, D1),
  21         AROS_LHA(struct FileInfoBlock *, fileInfoBlock, D2),
  22
  23 /*  LOCATION */
  24         struct DosLibrary *, DOSBase, 18, Dos)
  25
  26 /*  FUNCTION
  27
  28     Examine the next entry in a directory.
  29
  30     INPUTS
  31
  32     lock  --  lock on the direcory the contents of which to examine
  33     fib   --  a FileInfoBlock previously initialized by Examine()
  34               (or used before with ExNext())
  35
  36     RESULT
  37
  38     success  --  a boolean telling whether the operation was successful
  39                  or not. A failure occurs also if there is no "next" entry in
  40                  the directory. Then IoErr() equals ERROR_NO_MORE_ENTRIES.
  41
  42     NOTES
  43
  44     If scanning a filesystem tree recursively, you'll need to allocated a
  45     new FilInfoBlock for each directory level.
  46
  47     EXAMPLE
  48
  49     To examine a directory, do the following:
  50
  51     1.  Pass a lock on the directory and a FileInfoBlock (allocated by
  52         AllocDosObject()) to Examine().
  53     2.  Pass the same parameters to ExNext().
  54     3.  Do something with the FileInfoBlock returned.
  55     4.  Call ExNext() repeatedly until it returns FALSE and use the
  56         information you are provided. When ExNext returns FALSE, check IoErr()
  57         to make sure that there was no real failure (ERROR_NO_MORE_ENTRIES).
  58
  59     BUGS
  60         At the moment it is necessary that the lock passed to this
  61         function is a directory(!!) that has previously been
  62         assigned (i.e. assign env: env).
  63
  64     SEE ALSO
  65
  66     Examine(), IoErr(), AllocDosObject(), ExAll()
  67
  68     INTERNALS
  69
  70 *****************************************************************************/
  71 {
  72     AROS_LIBFUNC_INIT
  73     AROS_LIBBASE_EXT_DECL(struct DosLibrary *,DOSBase)
  74
  75     /* Get pointer to filehandle */
  76     struct FileHandle *fh = (struct FileHandle *)BADDR(lock);
  77
  78     /* Get pointer to I/O request. Use stackspace for now. */
  79     struct IOFileSys iofs;
  80
  81     /* Prepare I/O request. */
  82     InitIOFS(&iofs, FSA_EXAMINE_NEXT, DOSBase);
  83
  84     iofs.IOFS.io_Device = fh->fh_Device;
  85     iofs.IOFS.io_Unit   = fh->fh_Unit;
  86
  87     iofs.io_Union.io_EXAMINE_NEXT.io_fib = fileInfoBlock;
  88
  89     /* Send the request. */
  90     DosDoIO(&iofs.IOFS);
  91
  92     /* Set error code and return */
  93     SetIoErr(iofs.io_DosError);
  94
  95     if(iofs.io_DosError != 0)
  96         return DOSFALSE;
  97     else
  98         return DOSTRUE;
  99
 100     AROS_LIBFUNC_EXIT
 101 } /* ExNext */