// crt_snprintf.c
// compile with: /W3
#include <stdio.h>
#include <stdlib.h>

#if !defined(__cplusplus)
typedef int bool;
const bool true = 1;
const bool false = 0;
#endif

#define FAIL 0 // change to 1 and see what happens

int main(void)
{
   char buffer[200];
   const static char s[] = "computer"
#if FAIL
"computercomputercomputercomputercomputercomputercomputercomputer"
"computercomputercomputercomputercomputercomputercomputercomputer"
"computercomputercomputercomputercomputercomputercomputercomputer"
"computercomputercomputercomputercomputercomputercomputercomputer"
#endif
   ;
   const char c = 'l'; 
   const int i = 35;
#if FAIL
   const double fp = 1e300; // doesn't fit in the buffer
#else
   const double fp = 1.7320534;
#endif
   /* !subtract one to prevent "squeezing out" the terminal nul! */
   const int bufferSize = sizeof(buffer)/sizeof(buffer[0]) - 1;
   int bufferUsed = 0;
   int bufferLeft = bufferSize - bufferUsed;
   bool bSuccess = true;
   buffer[0] = 0;

   /* Format and print various data: */

   if (bufferLeft > 0)
   {
      int perElementBufferUsed = _snprintf(&buffer[bufferUsed], 
      bufferLeft, "   String: %s\n", s ); // C4996
      // Note: _snprintf is deprecated; consider _snprintf_s instead
      if (bSuccess = (perElementBufferUsed >= 0))
      {
         bufferUsed += perElementBufferUsed;
         bufferLeft -= perElementBufferUsed;
         if (bufferLeft > 0)
         {
            int perElementBufferUsed = _snprintf(&buffer[bufferUsed], 
            bufferLeft, "   Character: %c\n", c ); // C4996
            if (bSuccess = (perElementBufferUsed >= 0))
            {
               bufferUsed += perElementBufferUsed;
               bufferLeft -= perElementBufferUsed;
               if (bufferLeft > 0)
               {
                  int perElementBufferUsed = _snprintf(&buffer
                  [bufferUsed], bufferLeft, "   Integer: %d\n", i ); // C4996
                  if (bSuccess = (perElementBufferUsed >= 0))
                  {
                     bufferUsed += perElementBufferUsed;
                     bufferLeft -= perElementBufferUsed;
                     if (bufferLeft > 0)
                     {
                        int perElementBufferUsed = _snprintf(&buffer
                        [bufferUsed], bufferLeft, "   Real: %f\n", fp ); // C4996
                        if (bSuccess = (perElementBufferUsed >= 0))
                        {
                           bufferUsed += perElementBufferUsed;
                        }
                     }
                  }
               }
            }
         }
      }
   }

   if (!bSuccess)
   {
      printf("%s\n", "failure");
   }
   else
   {
      /* !store nul because _snprintf doesn't necessarily (if the string 
       * fits without the terminal nul, but not with it)!
       * bufferUsed might be as large as bufferSize, which normally is 
       * like going one element beyond a buffer, but in this case 
       * subtracted one from bufferSize, so we're ok.
       */
      buffer[bufferUsed] = 0;
      printf( "Output:\n%s\ncharacter count = %d\n", buffer, bufferUsed );
   }
   return EXIT_SUCCESS;
}