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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: 10 rules found
cppcoreguidelines
    Impact
      Clean code attribute
        1. Function-like macros should not be used

           Code Smell
        2. Boolean operations should not have numeric operands, and vice versa

           Bug
        3. A cast shall not remove any const or volatile qualification from the type of a pointer or reference

           Code Smell
        4. Loop variables should be declared in the minimal possible scope

           Code Smell
        5. Relational and subtraction operators should not be used with pointers to different arrays

           Bug
        6. Arguments evaluation order should not be relied on

           Bug
        7. User-defined types should not be passed as variadic arguments

           Bug
        8. Local variables and member data should not be volatile

           Code Smell
        9. Types and variables should be declared in separate statements

           Code Smell
        10. Type specifiers should be listed in a standard order

           Code Smell

        Arguments evaluation order should not be relied on

        intentionality - logical
        reliability
        Bug
        • cppcoreguidelines
        • unpredictable
        • lock-in

        Why is this an issue?

        More Info

        Arguments evaluation order in a function call is not specified:

        • Before C++17, the evaluation of each argument was unsequenced with the evaluation of other arguments, which can lead to undefined behavior if the same value is modified in several arguments,
        • After C++17, it is sequenced, but in an unspecified order: the behavior is not longer undefined, but the values passed to the function will be non portable.

        Both cases should be avoided, because the code will probably not be what was expected.

        Noncompliant code example

        void f(int i, int j);
        
        void g() {
          int i = 0;
          f(++i, ++i); // Noncompliant, the call could either be f(1,2) or f(2,1) (since C++17) or undefined behavior (before C++17)
        }
        

        Exceptions

        This rule does not apply to overloaded operators because they respect the sequencing order rules of the operator they overload (since C++17).

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