text: /* TEMPLATE GENERATED TESTCASE FILE
  Filename: CWE121_Stack_Based_Buffer_Overflow__dest_char_declare_loop_34.c
  Label Definition File: CWE121_Stack_Based_Buffer_Overflow__dest.string.label.xml
  Template File: sources-sink-34.tmpl.c
  */
  /*
   * @description
   * CWE: 121 Stack Based Buffer Overflow
   * BadSource:  Set data pointer to the bad buffer
   * GoodSource: Set data pointer to the good buffer
   * Sinks: loop
   *    BadSink : Copy string to data using a loop
   * 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 * a;
      char * b;
  } CWE121_Stack_Based_Buffer_Overflow__dest_char_declare_loop_34_union_type;
  
  #ifndef OMITBAD
  
  void CWE121_Stack_Based_Buffer_Overflow__dest_char_declare_loop_34_bad()
  {
      char * data;
      CWE121_Stack_Based_Buffer_Overflow__dest_char_declare_loop_34_union_type my_union;
      char data_badbuf[50];
      char data_goodbuf[100];
      /* FLAW: Set a pointer to a "small" buffer. This buffer will be used in the sinks as a destination
       * buffer in various memory copying functions using a "large" source buffer. */
      data = data_badbuf;
      data[0] = '\0'; /* null terminate */
      my_union.a = data;
      {
          char * data = my_union.b;
          {
              size_t i;
              char src[100];
              memset(src, 'C', 100-1); /* fill with 'C's */
              src[100-1] = '\0'; /* null terminate */
              /* POTENTIAL FLAW: Possible buffer overflow if the size of data is less than the length of src */
              for (i = 0; i < 100; i++)
              {
                  data[i] = src[i];
              }
              data[100-1] = '\0'; /* Ensure the destination buffer is null terminated */
              printLine(data);
          }
      }
  }
  
  #endif /* OMITBAD */
  
  #ifndef OMITGOOD
  
  /* goodG2B() uses the GoodSource with the BadSink */
  static void goodG2B()
  {
      char * data;
      CWE121_Stack_Based_Buffer_Overflow__dest_char_declare_loop_34_union_type my_union;
      char data_badbuf[50];
      char data_goodbuf[100];
      /* FIX: Set a pointer to a "large" buffer, thus avoiding buffer overflows in the sinks. */
      data = data_goodbuf;
      data[0] = '\0'; /* null terminate */
      my_union.a = data;
      {
          char * data = my_union.b;
          {
              size_t i;
              char src[100];
              memset(src, 'C', 100-1); /* fill with 'C's */
              src[100-1] = '\0'; /* null terminate */
              /* POTENTIAL FLAW: Possible buffer overflow if the size of data is less than the length of src */
              for (i = 0; i < 100; i++)
              {
                  data[i] = src[i];
              }
              data[100-1] = '\0'; /* Ensure the destination buffer is null terminated */
              printLine(data);
          }
      }
  }
  
  void CWE121_Stack_Based_Buffer_Overflow__dest_char_declare_loop_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()...");
      CWE121_Stack_Based_Buffer_Overflow__dest_char_declare_loop_34_good();
      printLine("Finished good()");
  #endif /* OMITGOOD */
  #ifndef OMITBAD
      printLine("Calling bad()...");
      CWE121_Stack_Based_Buffer_Overflow__dest_char_declare_loop_34_bad();
      printLine("Finished bad()");
  #endif /* OMITBAD */
      return 0;
  }
  
  #endif
  