[clang] [clang][StaticAnalyzer] Adding getentropy to CStringChecker. (PR #83675)

[via cfe-commits]

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@@ -2515,6 +2517,53 @@ void CStringChecker::evalSprintfCommon(CheckerContext &C, const CallEvent &Call,
   C.addTransition(State);
 }
 
+void CStringChecker::evalGetentropy(CheckerContext &C, const CallEvent &Call) const {
+  DestinationArgExpr Buffer = {{Call.getArgExpr(0), 0}};
+  SizeArgExpr Size = {{Call.getArgExpr(1), 1}};
+  ProgramStateRef State = C.getState();
+  SValBuilder &SVB = C.getSValBuilder();
+  SVal MaxLength = SVB.makeIntVal(256, C.getASTContext().IntTy);
+
+  SVal SizeVal = C.getSVal(Size.Expression);
+  QualType SizeTy = Size.Expression->getType();
+
+  ProgramStateRef StateZeroSize, StateNonZeroSize;
+  std::tie(StateZeroSize, StateNonZeroSize) =
----------------
NagyDonat wrote:

```suggestion
  auto [StateZeroSize, StateNonZeroSize] =
```
We have C++17, we can use structured bindings instead of `std::tie`.

https://github.com/llvm/llvm-project/pull/83675