text: /* TEMPLATE GENERATED TESTCASE FILE
  Filename: CWE122_Heap_Based_Buffer_Overflow__c_CWE805_char_ncpy_34.c
  Label Definition File: CWE122_Heap_Based_Buffer_Overflow__c_CWE805.string.label.xml
  Template File: sources-sink-34.tmpl.c
  */
  /*
   * @description
   * CWE: 122 Heap Based Buffer Overflow
   * BadSource:  Allocate using malloc() and set data pointer to a small buffer
   * GoodSource: Allocate using malloc() and set data pointer to a large buffer
   * Sinks: ncpy
   *    BadSink : Copy string to data using strncpy
   * 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"
  
  #include <wchar.h>
  
  typedef union
  {
      char * unionFirst;
      char * unionSecond;
  } CWE122_Heap_Based_Buffer_Overflow__c_CWE805_char_ncpy_34_unionType;
  
  #ifndef OMITBAD
  
  void CWE122_Heap_Based_Buffer_Overflow__c_CWE805_char_ncpy_34_bad()
  {
      char * data;
      CWE122_Heap_Based_Buffer_Overflow__c_CWE805_char_ncpy_34_unionType myUnion;
      data = NULL;
      /* FLAW: Allocate and point data to a small buffer that is smaller than the large buffer used in the sinks */
      data = (char *)malloc(50*sizeof(char));
      data[0] = '\0'; /* null terminate */
      myUnion.unionFirst = data;
      {
          char * data = myUnion.unionSecond;
          {
              char source[100];
              memset(source, 'C', 100-1); /* fill with 'C's */
              source[100-1] = '\0'; /* null terminate */
              /* POTENTIAL FLAW: Possible buffer overflow if source is larger than data */
              strncpy(data, source, 100-1);
              data[100-1] = '\0'; /* Ensure the destination buffer is null terminated */
              printLine(data);
              free(data);
          }
      }
  }
  
  #endif /* OMITBAD */
  
  #ifndef OMITGOOD
  
  /* goodG2B() uses the GoodSource with the BadSink */
  static void goodG2B()
  {
      char * data;
      CWE122_Heap_Based_Buffer_Overflow__c_CWE805_char_ncpy_34_unionType myUnion;
      data = NULL;
      /* FIX: Allocate and point data to a large buffer that is at least as large as the large buffer used in the sink */
      data = (char *)malloc(100*sizeof(char));
      data[0] = '\0'; /* null terminate */
      myUnion.unionFirst = data;
      {
          char * data = myUnion.unionSecond;
          {
              char source[100];
              memset(source, 'C', 100-1); /* fill with 'C's */
              source[100-1] = '\0'; /* null terminate */
              /* POTENTIAL FLAW: Possible buffer overflow if source is larger than data */
              strncpy(data, source, 100-1);
              data[100-1] = '\0'; /* Ensure the destination buffer is null terminated */
              printLine(data);
              free(data);
          }
      }
  }
  
  void CWE122_Heap_Based_Buffer_Overflow__c_CWE805_char_ncpy_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()...");
      CWE122_Heap_Based_Buffer_Overflow__c_CWE805_char_ncpy_34_good();
      printLine("Finished good()");
  #endif /* OMITGOOD */
  #ifndef OMITBAD
      printLine("Calling bad()...");
      CWE122_Heap_Based_Buffer_Overflow__c_CWE805_char_ncpy_34_bad();
      printLine("Finished bad()");
  #endif /* OMITBAD */
      return 0;
  }
  
  #endif
  