text: /* TEMPLATE GENERATED TESTCASE FILE
  Filename: CWE191_Integer_Underflow__short_fscanf_multiply_03.c
  Label Definition File: CWE191_Integer_Underflow.label.xml
  Template File: sources-sinks-03.tmpl.c
  */
  /*
   * @description
   * CWE: 191 Integer Underflow
   * BadSource: fscanf Read data from the console using fscanf()
   * GoodSource: Set data to a small, non-zero number (negative two)
   * Sinks: multiply
   *    GoodSink: Ensure there will not be an underflow before multiplying data by 2
   *    BadSink : If data is negative, multiply by 2, which can cause an underflow
   * Flow Variant: 03 Control flow: if(5==5) and if(5!=5)
   *
   * */
  
  #include "std_testcase.h"
  
  #ifndef OMITBAD
  
  void CWE191_Integer_Underflow__short_fscanf_multiply_03_bad()
  {
      short data;
      data = 0;
      if(5==5)
      {
          /* POTENTIAL FLAW: Use a value input from the console */
          fscanf (stdin, "%hd", &data);
      }
      if(5==5)
      {
          if(data < 0) /* ensure we won't have an overflow */
          {
              /* POTENTIAL FLAW: if (data * 2) < SHRT_MIN, this will underflow */
              short result = data * 2;
              printIntLine(result);
          }
      }
  }
  
  #endif /* OMITBAD */
  
  #ifndef OMITGOOD
  
  /* goodB2G1() - use badsource and goodsink by changing the second 5==5 to 5!=5 */
  static void goodB2G1()
  {
      short data;
      data = 0;
      if(5==5)
      {
          /* POTENTIAL FLAW: Use a value input from the console */
          fscanf (stdin, "%hd", &data);
      }
      if(5!=5)
      {
          /* INCIDENTAL: CWE 561 Dead Code, the code below will never run */
          printLine("Benign, fixed string");
      }
      else
      {
          if(data < 0) /* ensure we won't have an overflow */
          {
              /* FIX: Add a check to prevent an underflow from occurring */
              if (data > (SHRT_MIN/2))
              {
                  short result = data * 2;
                  printIntLine(result);
              }
              else
              {
                  printLine("data value is too small to perform multiplication.");
              }
          }
      }
  }
  
  /* goodB2G2() - use badsource and goodsink by reversing the blocks in the second if */
  static void goodB2G2()
  {
      short data;
      data = 0;
      if(5==5)
      {
          /* POTENTIAL FLAW: Use a value input from the console */
          fscanf (stdin, "%hd", &data);
      }
      if(5==5)
      {
          if(data < 0) /* ensure we won't have an overflow */
          {
              /* FIX: Add a check to prevent an underflow from occurring */
              if (data > (SHRT_MIN/2))
              {
                  short result = data * 2;
                  printIntLine(result);
              }
              else
              {
                  printLine("data value is too small to perform multiplication.");
              }
          }
      }
  }
  
  /* goodG2B1() - use goodsource and badsink by changing the first 5==5 to 5!=5 */
  static void goodG2B1()
  {
      short data;
      data = 0;
      if(5!=5)
      {
          /* INCIDENTAL: CWE 561 Dead Code, the code below will never run */
          printLine("Benign, fixed string");
      }
      else
      {
          /* FIX: Use a small, non-zero value that will not cause an underflow in the sinks */
          data = -2;
      }
      if(5==5)
      {
          if(data < 0) /* ensure we won't have an overflow */
          {
              /* POTENTIAL FLAW: if (data * 2) < SHRT_MIN, this will underflow */
              short result = data * 2;
              printIntLine(result);
          }
      }
  }
  
  /* goodG2B2() - use goodsource and badsink by reversing the blocks in the first if */
  static void goodG2B2()
  {
      short data;
      data = 0;
      if(5==5)
      {
          /* FIX: Use a small, non-zero value that will not cause an underflow in the sinks */
          data = -2;
      }
      if(5==5)
      {
          if(data < 0) /* ensure we won't have an overflow */
          {
              /* POTENTIAL FLAW: if (data * 2) < SHRT_MIN, this will underflow */
              short result = data * 2;
              printIntLine(result);
          }
      }
  }
  
  void CWE191_Integer_Underflow__short_fscanf_multiply_03_good()
  {
      goodB2G1();
      goodB2G2();
      goodG2B1();
      goodG2B2();
  }
  
  #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()...");
      CWE191_Integer_Underflow__short_fscanf_multiply_03_good();
      printLine("Finished good()");
  #endif /* OMITGOOD */
  #ifndef OMITBAD
      printLine("Calling bad()...");
      CWE191_Integer_Underflow__short_fscanf_multiply_03_bad();
      printLine("Finished bad()");
  #endif /* OMITBAD */
      return 0;
  }
  
  #endif
  