text: /* TEMPLATE GENERATED TESTCASE FILE
  Filename: CWE121_Stack_Based_Buffer_Overflow__CWE806_char_declare_snprintf_42.c
  Label Definition File: CWE121_Stack_Based_Buffer_Overflow__CWE806.label.xml
  Template File: sources-sink-42.tmpl.c
  */
  /*
   * @description
   * CWE: 121 Stack Based Buffer Overflow
   * BadSource:  Initialize data as a large string
   * GoodSource: Initialize data as a small string
   * Sink: snprintf
   *    BadSink : Copy data to string using snprintf
   * Flow Variant: 42 Data flow: data returned from one function to another in the same source file
   *
   * */
  
  #include "std_testcase.h"
  
  #include <wchar.h>
  
  #ifdef _WIN32
  #define SNPRINTF _snprintf
  #else
  #define SNPRINTF snprintf
  #endif
  
  #ifndef OMITBAD
  
  static char * badSource(char * data)
  {
      /* FLAW: Initialize data as a large buffer that is larger than the small buffer used in the sink */
      memset(data, 'A', 100-1); /* fill with 'A's */
      data[100-1] = '\0'; /* null terminate */
      return data;
  }
  
  void CWE121_Stack_Based_Buffer_Overflow__CWE806_char_declare_snprintf_42_bad()
  {
      char * data;
      char dataBuffer[100];
      data = dataBuffer;
      data = badSource(data);
      {
          char dest[50] = "";
          /* POTENTIAL FLAW: Possible buffer overflow if data is larger than dest */
          SNPRINTF(dest, strlen(data), "%s", data);
          printLine(data);
      }
  }
  
  #endif /* OMITBAD */
  
  #ifndef OMITGOOD
  
  static char * goodG2BSource(char * data)
  {
      /* FIX: Initialize data as a small buffer that as small or smaller than the small buffer used in the sink */
      memset(data, 'A', 50-1); /* fill with 'A's */
      data[50-1] = '\0'; /* null terminate */
      return data;
  }
  
  /* goodG2B uses the GoodSource with the BadSink */
  static void goodG2B()
  {
      char * data;
      char dataBuffer[100];
      data = dataBuffer;
      data = goodG2BSource(data);
      {
          char dest[50] = "";
          /* POTENTIAL FLAW: Possible buffer overflow if data is larger than dest */
          SNPRINTF(dest, strlen(data), "%s", data);
          printLine(data);
      }
  }
  
  void CWE121_Stack_Based_Buffer_Overflow__CWE806_char_declare_snprintf_42_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__CWE806_char_declare_snprintf_42_good();
      printLine("Finished good()");
  #endif /* OMITGOOD */
  #ifndef OMITBAD
      printLine("Calling bad()...");
      CWE121_Stack_Based_Buffer_Overflow__CWE806_char_declare_snprintf_42_bad();
      printLine("Finished bad()");
  #endif /* OMITBAD */
      return 0;
  }
  
  #endif
  