CUtlString::operator+=

/* CUtlString::TEMPNAMEPLACEHOLDERVALUE(char const*) */

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

{
  size_t __n;
  int iVar1;
  int iVar2;
  
  if (*(int *)(this + 0xc) == 0) {
    iVar2 = 0;
  }
  else {
    iVar2 = *(int *)(this + 0xc) + -1;
  }
  __n = _V_strlen(param_1);
  iVar1 = 0;
  if (0 < (int)(__n + iVar2)) {
    iVar1 = __n + iVar2 + 1;
  }
  CUtlBinaryBlock::SetLength((CUtlBinaryBlock *)this,iVar1);
  if (*(int *)(this + 0xc) == 0) {
    if (-__n == iVar2 || -iVar2 < (int)__n) {
      __n = -iVar2;
    }
    iVar1 = 0;
    CUtlBinaryBlock::SetLength((CUtlBinaryBlock *)this,1);
    **(undefined1 **)this = 0;
  }
  else {
    iVar1 = *(int *)(this + 0xc) + -1;
    if (iVar1 - iVar2 <= (int)__n) {
      __n = iVar1 - iVar2;
    }
  }
  memcpy((void *)(iVar2 + *(int *)this),param_1,__n);
  *(undefined1 *)(*(int *)this + iVar1) = 0;
  return this;
}