workbench/libs/camd/nextmidi.c

   1 /*
   2     Copyright © 1995-2007, The AROS Development Team. All rights reserved.
   3     $Id$
   4
   5     Desc:
   6     Lang: English
   7 */
   8
   9
  10 #include "camd_intern.h"
  11
  12
  13 /*****************************************************************************
  14
  15     NAME */
  16
  17         AROS_LH1(struct MidiNode *, NextMidi,
  18
  19 /*  SYNOPSIS */
  20         AROS_LHA(struct MidiNode *, midinode, A0),
  21
  22 /*  LOCATION */
  23         struct CamdBase *, CamdBase, 11, Camd)
  24
  25 /*  FUNCTION
  26                 Returns the next midinode in the list of midinodes, or NULL
  27                 if midinode was the last one.
  28
  29     INPUTS
  30                 midinode - The midinode to begin searching from. If NULL,
  31                            returns the first midinode in the list.
  32
  33     RESULT
  34
  35     NOTES
  36                 CL_Linkages must be locked.
  37
  38     EXAMPLE
  39
  40     BUGS
  41
  42     SEE ALSO
  43
  44     INTERNALS
  45
  46     HISTORY
  47
  48         2001-01-12 ksvalast first created
  49
  50 *****************************************************************************/
  51 {
  52     AROS_LIBFUNC_INIT
  53
  54         struct Node *node=CB(CamdBase)->mymidinodes.lh_Head;
  55
  56         if(midinode==NULL){
  57                 if(IsListEmpty(&CB(CamdBase)->mymidinodes)) return NULL;
  58                 return (struct MidiNode *)node;
  59         }
  60
  61         if(midinode->mi_Node.ln_Succ->ln_Succ==NULL) return NULL;
  62
  63         return (struct MidiNode *)midinode->mi_Node.ln_Succ;
  64
  65    AROS_LIBFUNC_EXIT
  66 }
  67