text: /* TEMPLATE GENERATED TESTCASE FILE
  Filename: CWE121_Stack_Based_Buffer_Overflow__src_wchar_t_alloca_cat_18.c
  Label Definition File: CWE121_Stack_Based_Buffer_Overflow__src.string.label.xml
  Template File: sources-sink-18.tmpl.c
  */
  /*
   * @description
   * CWE: 121 Stack Based Buffer Overflow
   * BadSource:  Initialize data as a large string
   * GoodSource: Initialize data as a small string
   * Sink: cat
   *    BadSink : Copy data to string using wcscat
   * Flow Variant: 18 Control flow: goto statements
   *
   * */
  
  #include "std_testcase.h"
  
  #include <wchar.h>
  
  #ifndef OMITBAD
  
  void CWE121_Stack_Based_Buffer_Overflow__src_wchar_t_alloca_cat_18_bad()
  {
      wchar_t * data;
      wchar_t * data_buf = (wchar_t *)ALLOCA(100*sizeof(wchar_t));
      data = data_buf;
      goto source;
      /* INCIDENTAL: CWE 561 Dead Code, the code below will never run */
      /* FIX: Initialize data as a small buffer that as small or smaller than the small buffer used in the sink */
      wmemset(data, L'A', 50-1); /* fill with L'A's */
      data[50-1] = L'\0'; /* null terminate */
  source:
      /* FLAW: Initialize data as a large buffer that is larger than the small buffer used in the sink */
      wmemset(data, L'A', 100-1); /* fill with L'A's */
      data[100-1] = L'\0'; /* null terminate */
      {
          wchar_t dest[50] = L"";
          /* POTENTIAL FLAW: Possible buffer overflow if data is larger than sizeof(dest)-wcslen(dest)*/
          wcscat(dest, data);
          printWLine(data);
      }
  }
  
  #endif /* OMITBAD */
  
  #ifndef OMITGOOD
  
  /* goodG2B() - use goodsource and badsink by reversing the blocks on the goto statement */
  static void goodG2B()
  {
      wchar_t * data;
      wchar_t * data_buf = (wchar_t *)ALLOCA(100*sizeof(wchar_t));
      data = data_buf;
      goto source;
      /* INCIDENTAL: CWE 561 Dead Code, the code below will never run */
      /* FLAW: Initialize data as a large buffer that is larger than the small buffer used in the sink */
      wmemset(data, L'A', 100-1); /* fill with L'A's */
      data[100-1] = L'\0'; /* null terminate */
  source:
      /* FIX: Initialize data as a small buffer that as small or smaller than the small buffer used in the sink */
      wmemset(data, L'A', 50-1); /* fill with L'A's */
      data[50-1] = L'\0'; /* null terminate */
      {
          wchar_t dest[50] = L"";
          /* POTENTIAL FLAW: Possible buffer overflow if data is larger than sizeof(dest)-wcslen(dest)*/
          wcscat(dest, data);
          printWLine(data);
      }
  }
  
  void CWE121_Stack_Based_Buffer_Overflow__src_wchar_t_alloca_cat_18_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__src_wchar_t_alloca_cat_18_good();
      printLine("Finished good()");
  #endif /* OMITGOOD */
  #ifndef OMITBAD
      printLine("Calling bad()...");
      CWE121_Stack_Based_Buffer_Overflow__src_wchar_t_alloca_cat_18_bad();
      printLine("Finished bad()");
  #endif /* OMITBAD */
      return 0;
  }
  
  #endif
  