rom/utility/packbooltags.c

   1 /*
   2     Copyright © 1995-2001, The AROS Development Team. All rights reserved.
   3     $Id$
   4
   5     Desc:
   6     Lang: english
   7 */
   8 #include "intern.h"
   9
  10 /*****************************************************************************
  11
  12     NAME */
  13 #include <utility/tagitem.h>
  14 #include <proto/utility.h>
  15
  16         AROS_LH3(ULONG, PackBoolTags,
  17
  18 /*  SYNOPSIS */
  19         AROS_LHA(ULONG           , initialFlags, D0),
  20         AROS_LHA(struct TagItem *, tagList, A0),
  21         AROS_LHA(struct TagItem *, boolMap, A1),
  22
  23 /*  LOCATION */
  24         struct UtilityBase *, UtilityBase, 7, Utility)
  25
  26 /*  FUNCTION
  27         Scans through the list tagList to find the tags which are contained
  28         in the list boolMap which are then converted to a bit-flag
  29         representation as defined in boolMap.
  30
  31         If the value of the Tag's data is 0, then the boolean value of the
  32         tag is defined as false, otherwise it is true.
  33
  34     INPUTS
  35         initialFlags -  an initial set of bit-flags which will be changed
  36                         by this function.
  37
  38         tagList      -  A TagItem list which contains some tags which are
  39                         defined as boolean by having a corresponding tag
  40                         in boolMap. The boolean value of tag->ti_Data
  41                         determines whether the bits in the flag are
  42                         TRUE or FALSE.
  43
  44         boolMap      -  A TagItem list containing a series of tags which
  45                         are to be considered Boolean.
  46
  47     RESULT
  48         flags        -  The value of initialFlags modified by the values
  49                         of the boolean tags defined in boolMap.
  50
  51     NOTES
  52         If there is more than one Tag in tagList of a single type. The
  53         last of these tags will determine the value of that bit-flag.
  54
  55     EXAMPLE
  56
  57     BUGS
  58
  59     SEE ALSO
  60         GetTagData(), FindTagItem(), NextTagItem()
  61
  62     INTERNALS
  63
  64     HISTORY
  65         29-10-95    digulla automatically created from
  66                             utility_lib.fd and clib/utility_protos.h
  67         18-08-96    iaint   Created. But still needs some testing.
  68
  69 *****************************************************************************/
  70 {
  71     AROS_LIBFUNC_INIT
  72     struct TagItem *current, *found, *tstate = tagList;
  73
  74     while ((current = NextTagItem ((const struct TagItem **)&tstate)))
  75     {
  76         if ((found = FindTagItem (current->ti_Tag, boolMap)))
  77         {
  78             if (current->ti_Data == 0)
  79                 initialFlags &= ~(found->ti_Data);
  80             else
  81                 initialFlags |= found->ti_Data;
  82         }
  83     }
  84
  85     return initialFlags;
  86     AROS_LIBFUNC_EXIT
  87 } /* PackBoolTags */