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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
  • Vulnerability13
  • Bug76
  • Security Hotspot19
  • Code Smell207

  • Quick Fix 19
Filtered: 7 rules found
unpredictable
    Impact
      Clean code attribute
        1. Arguments evaluation order should not be relied on

           Bug
        2. Keywords shall not be used as macros identifiers

           Code Smell
        3. Dereferenced null pointers should not be bound to references

           Code Smell
        4. Header guards should be followed by a matching "#define" macro

           Code Smell
        5. "memcmp" should only be called with pointers to trivially copyable types with no padding

           Bug
        6. Stack allocated memory and non-owned memory should not be freed

           Bug
        7. The "<stdlib.h>" functions "bsearch" and "qsort" should not be used

           Bug

        "memcmp" should only be called with pointers to trivially copyable types with no padding

        intentionality - logical
        reliability
        Bug
        • unpredictable

        The function memcmp only returns meaningful results for objects of trivially copyable types without padding. This includes scalar types, arrays, and trivially copyable classes.

        Why is this an issue?

        How can I fix it?

        More Info

        memcmp compares the raw memory representation of two objects (what the standard calls their object representation). When objects are not trivially copyable or contain padding, they could have different raw memory representations even though they store identical values. So the result of memcmp is not meaningful.

        Padding refers to the insertion of additional bits into a structure or class to ensure proper alignment of its members in memory.

        Trivially copyable types include:

        • scalar types
        • trivially copyable classes
        • arrays of these types

        A class is trivially copyable when:

        • all its non-static data members and base classes are trivially copyable types,
        • it has no virtual functions or base classes,
        • its destructor is trival,
        • and one or more of the following special member functions is trivial, and the rest are deleted: copy constructor, move constructor, copy assignment operator, and move assignment operator.

        Note: a default implementation is always considered trivial, both when it is explicit (with = default) or implicit (if the special member function is omitted).

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