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[clang][analyzer][NFC] Supplement comments in evalFtell of StreamChecker #74291

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Dec 6, 2023
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[clang][analyzer][NFC] Supplement comments in evalFtell of StreamChecker #74291

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3 changes: 3 additions & 0 deletions clang/lib/StaticAnalyzer/Checkers/StreamChecker.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -1072,6 +1072,9 @@ void StreamChecker::evalFtell(const FnDescription *Desc, const CallEvent &Call,
ProgramStateRef StateFailed = State->BindExpr(
CE, C.getLocationContext(), SVB.makeIntVal(-1, C.getASTContext().LongTy));

// This function does not affect the stream state.
// Still we add success and failure state with the appropriate return value.
// StdLibraryFunctionsChecker can change these states (set the 'errno' state).
C.addTransition(StateNotFailed);
C.addTransition(StateFailed);
}
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