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**
** $Id: $
** $Revision: $
**
** $Filename: IFFError.S $
** $Author: Christian A. Weber $
** $Release: 19.1 $
** $Date: 92/05/11 21:11:27 $
**
** iff.library/IFFLib_IFFError
**
** COPYRIGHT (C) 1987-1992 BY CHRISTIAN A. WEBER, BRUGGERWEG 2,
** CH-8037 ZUERICH, SWITZERLAND. ALL RIGHTS RESERVED. NO PART
** OF THIS SOFTWARE MAY BE COPIED, REPRODUCED, OR TRANSMITTED
** IN ANY FORM OR BY ANY MEANS, WITHOUT THE PRIOR WRITTEN PER-
** MISSION OF THE AUTHOR. USE AT YOUR OWN RISK.
**
IDNT IFFLib_IFFError
SECTION text,CODE
INCLUDE "IFFLib.i"
XDEF FindOurNode,SetError,ClearError
XDEF IFFErrorFunc
******* iff.library/IFFLib_IFFError *****************************************
*
* NAME
* IFFLib_IFFError -- Get detailed error descrpition
*
* SYNOPSIS
* error = IFFLib_IFFError()
* D0
*
* LONG IFFLib_IFFError( void )
*
* FUNCTION
* If one of the above functions returns zero, you can call
* IFFLib_IFFError() to know the reason for the failure. An error
* code is returned, please refer to the files 'iff.h' or 'iff.i'
* for the complete list of errors.
*
* INPUTS
* none
*
* RESULT
* Error-number generated by the latest function call, or zero if
* no error
*
* Cuurently the following numbers are used:
*
* Nr. Symbol Function Description
*
* 16 IFF_CANTOPENFILE OpenIFF() File not found
* 17 IFF_READERROR OpenIFF() Read() returned an error
* 18 IFF_NOMEM OpenIFF() Not enough memory for the file
* 19 IFF_NOTIFF OpenIFF() File is not IFF
* 20 IFF_WRITEERROR SaveBitMap() Cannot write the file
*
* 24 IFF_NOILBM DecodePic() IFF file is not an ILBM file
* 25 IFF_NOBMHD DecodePic() BMHD chunk not found
* 26 IFF_NOBODY DecodePic() BODY chunk not found
* 27 IFF_TOOMANYPLANES DecodePic() Picture has more planes than the
* BitMap (OBSOLETE SINCE 18.7!)
* 28 IFF_UNKNOWNCOMPRESSION " Unknown compression type
* 29 IFF_NOANHD ModifyFrame() ANHD chunk not found
* 30 IFF_NODLTA ModifyFrame() DLTA chunk not found
*
* -1 IFF_BADTASK A task which did not open the IFF library
* tried to call IFFError(). Since the IFF
* library is capable of multi-tasking, the
* error-values are stored for each task
* separately.
*
* BUGS
* If you don't close the IFF library at the end of your program
* (using CloseLibrary()) the error node will not be freed. The
* same task will then not be able to re-open the iff.library.
* (This is not a bug, it's a feature ;-))
*
* SEE ALSO
*
*****************************************************************************
*** Unseren Node nach D0 und A0 bringen, Set Z-Flag if not found
FindOurNode: movea.l ib_SysBase(a5),a6
move.l ThisTask(a6),d1
move.l ib_ErrList(a5),d0 ; 1. Node in Error Liste
.findloop: movea.l d0,a0 ; next node
move.l LN_SUCC(a0),d0
beq.s .findend ; ---> Ende (Z-Flag gesetzt)
cmp.l er_Task(a0),d1 ; Unser Node ?
bne.s .findloop
move.l a0,d0 ; unser Node, Clear Z-Flag
.findend: rts
*****************************************************************************
ClearError: bsr FindOurNode ; Node nach D0 und A0
;; tst.l d0
beq.s 1$ ; no node ---> nichts eintragen
clr.l er_Error(a0)
1$: moveq #1,d0 ; Code für 'OK'
rts
*****************************************************************************
SetError: move.l d0,-(SP) ; Error-Nummer retten
bsr FindOurNode ; Node nach D0 und A0
;; tst.l d0
beq.s 1$ ; no node ---> nichts eintragen
move.l (SP),er_Error(a0)
1$:
addq.l #4,SP
moveq #0,d0 ; Code für 'Error'
rts
*****************************************************************************
IFFErrorFunc: movem.l a5-a6,-(SP)
movea.l a6,a5 ; IFFBase
bsr FindOurNode ; Node nach D0 und A0
;; tst.l d0
beq.s 1$ ; kein Node ---> Fehler!!
move.l er_Error(a0),d0
clr.l er_Error(a0) ; Error rücksetzen
2$: movem.l (SP)+,a5-a6
rts
1$:
moveq #IFF_BADTASK,d0
bra.s 2$
END
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