FindTransitionSequence

/* FindTransitionSequence(CStudioHdr*, int, int, int*) */

int FindTransitionSequence(CStudioHdr *param_1,int param_2,int param_3,int *param_4)

{
  char cVar1;
  int iVar2;
  int iVar3;
  int iVar4;
  undefined4 uVar5;
  undefined4 uVar6;
  int iVar7;
  int local_20;
  
  if ((((param_1 == (CStudioHdr *)0x0) ||
       (cVar1 = CStudioHdr::SequencesAvailable(param_1), cVar1 == '\0')) || (param_2 < 0)) ||
     (((iVar2 = CStudioHdr::GetNumSeq(param_1), iVar2 <= param_2 || (param_3 < 0)) ||
      (iVar2 = CStudioHdr::GetNumSeq(param_1), iVar2 <= param_3)))) {
    return param_3;
  }
  iVar2 = CStudioHdr::EntryNode(param_1,param_2);
  if ((iVar2 != 0) && (iVar2 = CStudioHdr::EntryNode(param_1,param_3), iVar2 != 0)) {
    if (*param_4 < 1) {
      local_20 = CStudioHdr::EntryNode(param_1,param_2);
    }
    else {
      local_20 = CStudioHdr::ExitNode(param_1,param_2);
    }
    iVar2 = CStudioHdr::EntryNode(param_1,param_3);
    if (local_20 != iVar2) {
      iVar7 = 0;
      iVar2 = CStudioHdr::EntryNode(param_1,param_3);
      iVar2 = CStudioHdr::GetTransition(param_1,local_20,iVar2);
      if (iVar2 == 0) {
        return param_3;
      }
      while( true ) {
        iVar3 = CStudioHdr::GetNumSeq(param_1);
        if (iVar3 <= iVar7) {
          iVar2 = CStudioHdr::EntryNode(param_1,param_3);
          uVar5 = CStudioHdr::pszNodeName(param_1,iVar2);
          uVar6 = CStudioHdr::pszNodeName(param_1,local_20);
          DevMsg(2,"error in transition graph: %s to %s\n",uVar6,uVar5);
          return param_3;
        }
        iVar3 = CStudioHdr::pSeqdesc(param_1,iVar7);
        iVar4 = CStudioHdr::EntryNode(param_1,iVar7);
        if ((local_20 == iVar4) && (iVar4 = CStudioHdr::ExitNode(param_1,iVar7), iVar2 == iVar4))
        break;
        if (((*(int *)(iVar3 + 0x78) != 0) &&
            (iVar3 = CStudioHdr::ExitNode(param_1,iVar7), local_20 == iVar3)) &&
           (iVar3 = CStudioHdr::EntryNode(param_1,iVar7), iVar2 == iVar3)) {
          *param_4 = -1;
          return iVar7;
        }
        iVar7 = iVar7 + 1;
      }
      *param_4 = 1;
      return iVar7;
    }
  }
  *param_4 = 1;
  return param_3;
}