CUtlString::operator+=

/* CUtlString::TEMPNAMEPLACEHOLDERVALUE(char) */

CUtlString * __thiscall CUtlString::operator+=(CUtlString *this,char param_1)

{
  int iVar1;
  int iVar2;
  int iVar3;
  
  iVar3 = *(int *)(this + 0xc);
  if (iVar3 == 0) {
    iVar3 = 1;
    iVar2 = 0;
    iVar1 = 2;
  }
  else {
    iVar2 = iVar3 + -1;
    iVar1 = iVar3 + 1;
    if (iVar3 < 1) {
      iVar1 = 0;
    }
  }
  CUtlBinaryBlock::SetLength((CUtlBinaryBlock *)this,iVar1);
  *(char *)(*(int *)this + iVar2) = param_1;
  *(undefined1 *)(*(int *)this + iVar3) = 0;
  return this;
}