text: /* TEMPLATE GENERATED TESTCASE FILE
  Filename: CWE194_Unexpected_Sign_Extension__negative_memmove_34.c
  Label Definition File: CWE194_Unexpected_Sign_Extension.label.xml
  Template File: sources-sink-34.tmpl.c
  */
  /*
   * @description
   * CWE: 194 Unexpected Sign Extension
   * BadSource: negative Set data to a fixed negative number
   * GoodSource: Positive integer
   * Sinks: memmove
   *    BadSink : Copy strings using memmove() with the length of data
   * Flow Variant: 34 Data flow: use of a union containing two methods of accessing the same data (within the same function)
   *
   * */
  
  #include "std_testcase.h"
  
  typedef union
  {
      short unionFirst;
      short unionSecond;
  } CWE194_Unexpected_Sign_Extension__negative_memmove_34_unionType;
  
  #ifndef OMITBAD
  
  void CWE194_Unexpected_Sign_Extension__negative_memmove_34_bad()
  {
      short data;
      CWE194_Unexpected_Sign_Extension__negative_memmove_34_unionType myUnion;
      /* Initialize data */
      data = 0;
      /* FLAW: Use a negative number */
      data = -1;
      myUnion.unionFirst = data;
      {
          short data = myUnion.unionSecond;
          {
              char source[100];
              char dest[100] = "";
              memset(source, 'A', 100-1);
              source[100-1] = '\0';
              if (data < 100)
              {
                  /* POTENTIAL FLAW: data is interpreted as an unsigned int - if its value is negative,
                   * the sign extension could result in a very large number */
                  memmove(dest, source, data);
                  dest[data] = '\0'; /* NULL terminate */
              }
              printLine(dest);
          }
      }
  }
  
  #endif /* OMITBAD */
  
  #ifndef OMITGOOD
  
  /* goodG2B() uses the GoodSource with the BadSink */
  static void goodG2B()
  {
      short data;
      CWE194_Unexpected_Sign_Extension__negative_memmove_34_unionType myUnion;
      /* Initialize data */
      data = 0;
      /* FIX: Use a positive integer less than &InitialDataSize&*/
      data = 100-1;
      myUnion.unionFirst = data;
      {
          short data = myUnion.unionSecond;
          {
              char source[100];
              char dest[100] = "";
              memset(source, 'A', 100-1);
              source[100-1] = '\0';
              if (data < 100)
              {
                  /* POTENTIAL FLAW: data is interpreted as an unsigned int - if its value is negative,
                   * the sign extension could result in a very large number */
                  memmove(dest, source, data);
                  dest[data] = '\0'; /* NULL terminate */
              }
              printLine(dest);
          }
      }
  }
  
  void CWE194_Unexpected_Sign_Extension__negative_memmove_34_good()
  {
      goodG2B();
  }
  
  #endif /* OMITGOOD */
  
  /* Below is the main(). It is only used when building this testcase on
   * its own for testing or for building a binary to use in testing binary
   * analysis tools. It is not used when compiling all the testcases as one
   * application, which is how source code analysis tools are tested.
   */
  #ifdef INCLUDEMAIN
  
  int main(int argc, char * argv[])
  {
      /* seed randomness */
      srand( (unsigned)time(NULL) );
  #ifndef OMITGOOD
      printLine("Calling good()...");
      CWE194_Unexpected_Sign_Extension__negative_memmove_34_good();
      printLine("Finished good()");
  #endif /* OMITGOOD */
  #ifndef OMITBAD
      printLine("Calling bad()...");
      CWE194_Unexpected_Sign_Extension__negative_memmove_34_bad();
      printLine("Finished bad()");
  #endif /* OMITBAD */
      return 0;
  }
  
  #endif
  