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C

C static code analysis

Unique rules to find Bugs, Vulnerabilities, Security Hotspots, and Code Smells in your C code

  • All rules 315
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  • Bug76
  • Security Hotspot19
  • Code Smell207

  • Quick Fix 19
Filtered: 18 rules found
brain-overload
    Impact
      Clean code attribute
        1. "#undef" should be used with caution

           Code Smell
        2. Object declarations should contain no more than 2 levels of pointer indirection

           Code Smell
        3. "goto" statement should not be used

           Code Smell
        4. Cognitive Complexity of functions should not be too high

           Code Smell
        5. "goto" statements should not be used to jump into blocks

           Code Smell
        6. Structures should not have too many fields

           Code Smell
        7. The ternary operator should not be used

           Code Smell
        8. Cyclomatic Complexity of functions should not be too high

           Code Smell
        9. "switch" statements should not have too many "case" clauses

           Code Smell
        10. Functions/methods should not have too many lines

           Code Smell
        11. Control flow statements "if", "for", "while", "switch" and "try" should not be nested too deeply

           Code Smell
        12. "switch case" clauses should not have too many lines of code

           Code Smell
        13. Functions should not contain too many return statements

           Code Smell
        14. Magic numbers should not be used

           Code Smell
        15. Functions should not have too many parameters

           Code Smell
        16. Expressions should not be too complex

           Code Smell
        17. Files should not have too many lines of code

           Code Smell
        18. A function should have a single point of exit at the end of the function

           Code Smell

        "#undef" should be used with caution

        intentionality - clear
        maintainability
        Code Smell
        • based-on-misra
        • brain-overload

        Why is this an issue?

        More Info

        Code that contains many macros becomes hard to understand. This is even worse when the set of defined macros is not stable, and you have to know at each point what macros are defined. Therefore, #undef can decrease the readability of macros.

        However, well-disciplined use of #undef can also improve readability, for instance when defining a macro with a limited scope: The macro is #defined, used a couple of times to reduce code duplication, then immediately #undefed.

        This rule raises an issue when a #undef undefines a macro that was defined in another file. It will also raise an issue for an #undef directive that tries to undefine a non-existing macro.

        Noncompliant code example

        #ifndef MY_HDR
        #define MY_HDR
        #endif
        ...
        #undef MY_HDR    /* Noncompliant */
        

        Compliant solution

        #define LEVEL(i) int const i = #i
        LEVEL(Debug);
        LEVEL(Warning);
        LEVEL(Error);
        #undef LEVEL
        
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