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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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  • Code Smell207

  • Quick Fix 19
Filtered: 7 rules found
preprocessor
    Impact
      Clean code attribute
        1. Lines starting with "#" should contain valid preprocessing directives

           Bug
        2. There shall be at most one occurrence of the # or ## operators in a single macro definition

           Code Smell
        3. Macros used in preprocessor directives should be defined before use

           Bug
        4. Function-like macros should not be invoked without all of their arguments

           Bug
        5. Function-like macros should not be used

           Code Smell
        6. Pre-defined macros should not be defined, redefined or undefined

           Code Smell
        7. Macro names should comply with a naming convention

           Code Smell

        There shall be at most one occurrence of the # or ## operators in a single macro definition

        intentionality - clear
        maintainability
        Code Smell
        • preprocessor
        • misra-c++2008
        • misra-c2004
        • misra-c2012

        Why is this an issue?

        More Info

        Because the evaluation order of # and ## are not specified, the results of using them both in the same macro could be unpredictable. Therefore macros should contain at most once instance of either # or ##.

        Noncompliant code example

        #define NonCompliant(a, b)  # a ## b
        int main() {
          std::cout << NonCompliant(Hello, World);
        }
        

        The result of this code is unspecified. It will either print "HelloWorld" or trigger a compilation error. If ## is evaluated first this will print HelloWorld. If # is evaluated first this will cause a compilation error telling that "Hello"World is not a valid preprocessor token.

        Compliant solution

        #define Stringfy(a) #a
        #define Compliant(a, b)  Stringfy(a##b)
        
        int main(){
          std::cout << Compliant(Hello, World);
        }
        

        This example will always print "HelloWorld".

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