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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: 13 rules found
lock-in
    Impact
      Clean code attribute
        1. "<time.h>" should not be used

           Code Smell
        2. "<stdio.h>" should not be used in production code

           Code Smell
        3. "<signal.h>" should not be used

           Bug
        4. Preprocessor operators "#" and "##" should not be used

           Code Smell
        5. Bitwise operators should not be applied to signed operands

           Bug
        6. Bit fields should be declared with appropriate types

           Code Smell
        7. Multicharacter literals should not be used

           Code Smell
        8. Arguments evaluation order should not be relied on

           Bug
        9. "#include_next" should not be used

           Code Smell
        10. GNU extensions should not be used

           Code Smell
        11. The "sizeof" and "alignof" operator should not be used with operands of a "void" type

           Bug
        12. Keywords introduced in later specifications should not be used as identifiers

           Code Smell
        13. Control should not be transferred into a complex logic block using a "goto" or a "switch" statement

           Code Smell

        Control should not be transferred into a complex logic block using a "goto" or a "switch" statement

        intentionality - clear
        maintainability
        Code Smell
        • lock-in
        • cert
        • misra-c++2008
        • pitfall

        Why is this an issue?

        More Info

        Having a switch and its cases wholly encompassed by a control structure such as a try, @try, catch, @catch, or a loop is perfectly acceptable. (try and catch are used hereafter to refer to both variants.) It is also acceptable to have a goto and its target label wholly encompassed in a control structure.

        What is not acceptable is using a goto or case to suddenly jump into the body of a try, catch, Objective-C @finally, or loop structure. Tangling labels or switch blocks with other control structures results in code that is difficult, if not impossible to understand. More importantly, when it compiles (some of these constructs won’t compile under ISO-conformant compilers), it can lead to unexpected results. Therefore this usage should be strictly avoided.

        This C++ code sample, which is also applicable to Objective-C if try and catch are converted to @try and @catch, demonstrates jumping into a switch and into a try and catch :

        Noncompliant code example

        void f ( int32_t i )
        {
          if ( 10 == i )
          {
            goto Label_10; // Noncompliant; goto transfers control into try block
          }
        
          if ( 11 == i )
          {
            goto Label_11; // Noncompliant; goto transfers control into catch block
          }
        
          switch ( i )
          {
            case 1:
              try
              {
                Label_10:
                case 2:  // Noncompliant; switch transfers control into try block
                  // Action
                  break;
              }
              catch ( ... )
              {
                Label_11:
                case 3: // Noncompliant; switch transfers control into catch block
                  // Action
                  break;
              }
              break;
            default:
            {
              // Default Action
              break;
            }
          }
        }
        

        Compliant solution

        void f ( int32_t i )
        {
          switch ( i )
          {
            case 1:
            case 2:
              // Action
              break;
            case 3:
              // Action
              break;
            case 10:
        
            default:
            {
              // Default Action
              break;
            }
          }
        
          try
          {
            if ( 2 == i || 10 == i)
            {
              // Action
            }
          }
          catch ( ... )
          {
            if (3 == i || 11 == i)
            {
              // Action
            }
          }
        }
        
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          Available Since
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