text: /* TEMPLATE GENERATED TESTCASE FILE
  Filename: CWE127_Buffer_Underread__malloc_char_ncpy_16.c
  Label Definition File: CWE127_Buffer_Underread__malloc.label.xml
  Template File: sources-sink-16.tmpl.c
  */
  /*
   * @description
   * CWE: 127 Buffer Under-read
   * BadSource:  Set data pointer to before the allocated memory buffer
   * GoodSource: Set data pointer to the allocated memory buffer
   * Sink: ncpy
   *    BadSink : Copy data to string using strncpy
   * Flow Variant: 16 Control flow: while(1) and while(0)
   *
   * */
  
  #include "std_testcase.h"
  
  #include <wchar.h>
  
  #ifndef OMITBAD
  
  void CWE127_Buffer_Underread__malloc_char_ncpy_16_bad()
  {
      char * data;
      data = NULL;
      while(0)
      {
          /* INCIDENTAL: CWE 561 Dead Code, the code below will never run */
          {
              char * data_buf = (char *)malloc(100*sizeof(char));
              memset(data_buf, 'A', 100-1);
              data_buf[100-1] = '\0';
              /* FIX: Set data pointer to the allocated memory buffer */
              data = data_buf;
          }
          break;
      }
      while(1)
      {
          {
              char * data_buf = (char *)malloc(100*sizeof(char));
              memset(data_buf, 'A', 100-1);
              data_buf[100-1] = '\0';
              /* FLAW: Set data pointer to before the allocated memory buffer */
              data = data_buf - 8;
          }
          break;
      }
      {
          char dest[100];
          memset(dest, 'C', 100-1); /* fill with 'C's */
          dest[100-1] = '\0'; /* null terminate */
          /* POTENTIAL FLAW: Possibly copy from a memory location located before the source buffer */
          strncpy(dest, data, strlen(dest));
          /* Ensure null termination */
          dest[100-1] = '\0';
          printLine(dest);
          /* INCIDENTAL CWE-401: Memory Leak - data may not point to location
             returned by malloc() so can't safely call free() on it */
      }
  }
  
  #endif /* OMITBAD */
  
  #ifndef OMITGOOD
  
  /* goodG2B() - use goodsource and badsink by changing the conditions on the while statements */
  static void goodG2B()
  {
      char * data;
      data = NULL;
      while(1)
      {
          {
              char * data_buf = (char *)malloc(100*sizeof(char));
              memset(data_buf, 'A', 100-1);
              data_buf[100-1] = '\0';
              /* FIX: Set data pointer to the allocated memory buffer */
              data = data_buf;
          }
          break;
      }
      while(0)
      {
          /* INCIDENTAL: CWE 561 Dead Code, the code below will never run */
          {
              char * data_buf = (char *)malloc(100*sizeof(char));
              memset(data_buf, 'A', 100-1);
              data_buf[100-1] = '\0';
              /* FLAW: Set data pointer to before the allocated memory buffer */
              data = data_buf - 8;
          }
          break;
      }
      {
          char dest[100];
          memset(dest, 'C', 100-1); /* fill with 'C's */
          dest[100-1] = '\0'; /* null terminate */
          /* POTENTIAL FLAW: Possibly copy from a memory location located before the source buffer */
          strncpy(dest, data, strlen(dest));
          /* Ensure null termination */
          dest[100-1] = '\0';
          printLine(dest);
          /* INCIDENTAL CWE-401: Memory Leak - data may not point to location
             returned by malloc() so can't safely call free() on it */
      }
  }
  
  void CWE127_Buffer_Underread__malloc_char_ncpy_16_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()...");
      CWE127_Buffer_Underread__malloc_char_ncpy_16_good();
      printLine("Finished good()");
  #endif /* OMITGOOD */
  #ifndef OMITBAD
      printLine("Calling bad()...");
      CWE127_Buffer_Underread__malloc_char_ncpy_16_bad();
      printLine("Finished bad()");
  #endif /* OMITBAD */
      return 0;
  }
  
  #endif
  