undefined4 FUN_00401820(int *param_1,int param_2)

{

  int *piVar1;

  int iVar2;

  undefined4 uVar3;

  if (param_1 == (int *)0x0) {

    FUN_0047f5a0(&DAT_0048afe0,"slist.c",0x6f,"ListAddItem");

  }

  if (param_2 == 0) {

    FUN_0047f5a0(&DAT_0048afe8,"slist.c",0x70,"ListAddItem");

  }

  piVar1 = (int *)FUN_00485150(1,0xc);

  uVar3 = 0;

  if (piVar1 != (int *)0x0) {

    iVar2 = *param_1;

    *piVar1 = param_2;

    piVar1[1] = 0;

    if (iVar2 == 0) {

      piVar1[2] = 0;

      param_1[1] = (int)piVar1;

      *param_1 = (int)piVar1;

    }

    else {

      iVar2 = param_1[1];

      *(int **)(iVar2 + 4) = piVar1;

      param_1[1] = (int)piVar1;

      piVar1[2] = iVar2;

    }

    uVar3 = 1;

    *(short *)(param_1 + 2) = (short)param_1[2] + 1;

  }

  return uVar3;

}