text: /* TEMPLATE GENERATED TESTCASE FILE
  Filename: CWE191_Integer_Underflow__int_fscanf_postdec_15.c
  Label Definition File: CWE191_Integer_Underflow__int.label.xml
  Template File: sources-sinks-15.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: decrement
   *    GoodSink: Ensure there will not be an underflow before decrementing data
   *    BadSink : Decrement data, which can cause an Underflow
   * Flow Variant: 15 Control flow: switch(6) and switch(7)
   *
   * */
  
  #include "std_testcase.h"
  
  #ifndef OMITBAD
  
  void CWE191_Integer_Underflow__int_fscanf_postdec_15_bad()
  {
      int data;
      /* Initialize data */
      data = 0;
      switch(6)
      {
      case 6:
          /* POTENTIAL FLAW: Read data from the console using fscanf() */
          fscanf(stdin, "%d", &data);
          break;
      default:
          /* INCIDENTAL: CWE 561 Dead Code, the code below will never run */
          printLine("Benign, fixed string");
          break;
      }
      switch(7)
      {
      case 7:
      {
          /* POTENTIAL FLAW: Decrementing data could cause an underflow */
          data--;
          int result = data;
          printIntLine(result);
      }
      break;
      default:
          /* INCIDENTAL: CWE 561 Dead Code, the code below will never run */
          printLine("Benign, fixed string");
          break;
      }
  }
  
  #endif /* OMITBAD */
  
  #ifndef OMITGOOD
  
  /* goodB2G1() - use badsource and goodsink by changing the second switch to switch(8) */
  static void goodB2G1()
  {
      int data;
      /* Initialize data */
      data = 0;
      switch(6)
      {
      case 6:
          /* POTENTIAL FLAW: Read data from the console using fscanf() */
          fscanf(stdin, "%d", &data);
          break;
      default:
          /* INCIDENTAL: CWE 561 Dead Code, the code below will never run */
          printLine("Benign, fixed string");
          break;
      }
      switch(8)
      {
      case 7:
          /* INCIDENTAL: CWE 561 Dead Code, the code below will never run */
          printLine("Benign, fixed string");
          break;
      default:
          /* FIX: Add a check to prevent an underflow from occurring */
          if (data > INT_MIN)
          {
              data--;
              int result = data;
              printIntLine(result);
          }
          else
          {
              printLine("data value is too large to perform arithmetic safely.");
          }
          break;
      }
  }
  
  /* goodB2G2() - use badsource and goodsink by reversing the blocks in the second switch */
  static void goodB2G2()
  {
      int data;
      /* Initialize data */
      data = 0;
      switch(6)
      {
      case 6:
          /* POTENTIAL FLAW: Read data from the console using fscanf() */
          fscanf(stdin, "%d", &data);
          break;
      default:
          /* INCIDENTAL: CWE 561 Dead Code, the code below will never run */
          printLine("Benign, fixed string");
          break;
      }
      switch(7)
      {
      case 7:
          /* FIX: Add a check to prevent an underflow from occurring */
          if (data > INT_MIN)
          {
              data--;
              int result = data;
              printIntLine(result);
          }
          else
          {
              printLine("data value is too large to perform arithmetic safely.");
          }
          break;
      default:
          /* INCIDENTAL: CWE 561 Dead Code, the code below will never run */
          printLine("Benign, fixed string");
          break;
      }
  }
  
  /* goodG2B1() - use goodsource and badsink by changing the first switch to switch(5) */
  static void goodG2B1()
  {
      int data;
      /* Initialize data */
      data = 0;
      switch(5)
      {
      case 6:
          /* INCIDENTAL: CWE 561 Dead Code, the code below will never run */
          printLine("Benign, fixed string");
          break;
      default:
          /* FIX: Use a small, non-zero value that will not cause an integer underflow in the sinks */
          data = -2;
          break;
      }
      switch(7)
      {
      case 7:
      {
          /* POTENTIAL FLAW: Decrementing data could cause an underflow */
          data--;
          int result = data;
          printIntLine(result);
      }
      break;
      default:
          /* INCIDENTAL: CWE 561 Dead Code, the code below will never run */
          printLine("Benign, fixed string");
          break;
      }
  }
  
  /* goodG2B2() - use goodsource and badsink by reversing the blocks in the first switch */
  static void goodG2B2()
  {
      int data;
      /* Initialize data */
      data = 0;
      switch(6)
      {
      case 6:
          /* FIX: Use a small, non-zero value that will not cause an integer underflow in the sinks */
          data = -2;
          break;
      default:
          /* INCIDENTAL: CWE 561 Dead Code, the code below will never run */
          printLine("Benign, fixed string");
          break;
      }
      switch(7)
      {
      case 7:
      {
          /* POTENTIAL FLAW: Decrementing data could cause an underflow */
          data--;
          int result = data;
          printIntLine(result);
      }
      break;
      default:
          /* INCIDENTAL: CWE 561 Dead Code, the code below will never run */
          printLine("Benign, fixed string");
          break;
      }
  }
  
  void CWE191_Integer_Underflow__int_fscanf_postdec_15_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__int_fscanf_postdec_15_good();
      printLine("Finished good()");
  #endif /* OMITGOOD */
  #ifndef OMITBAD
      printLine("Calling bad()...");
      CWE191_Integer_Underflow__int_fscanf_postdec_15_bad();
      printLine("Finished bad()");
  #endif /* OMITBAD */
      return 0;
  }
  
  #endif
  