/**
 *  @Comment: WSU - Fall 06 - CS 3830-0
 *  @Title: p3p4.c - Project 3 prog 4
 *  @Author:  Vincenzo Maggio
 */

#include <conio.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

int main( void)
{
  int i, ic;
  signed short index;
  char dest[10], *myarray, str[6] = "Hello\0";
  size_t len;

  system("color f0");

MENU:
  system("cls"); gotoxy( 29, 2); printf("CS 3830 - Prj. 3 Prg. 4");
  gotoxy(  1, 4); printf(" 1. Array index (this crashes the program !)\n");
  printf(" 2. malloc()\n");  printf(" 3. memcpy()\t\t0. Exit\n");
  printf(" 4. strncpy()\n"); printf("\n Choice: ");

  while ( !kbhit());
  ic = getchar(); printf("\n");
  switch ( ic)
  {
    case '1':
        myarray = (char *) malloc( 32800);
        if ( myarray)
        {
          memset( myarray, 65, 32800);
          for ( i = index = 32765; i < 32800; i++, index++)
            /*  THIS CODE CRASHES THE PROGRAM !!!  */
            printf("%c ", myarray[index]);
          free( myarray);
        }
        break;
    case '2':
        index = 32766;
        index += 10;
        myarray = (char *) malloc( index);
        printf( "\n Value of pointer returned by malloc: %p\n\n", myarray );
        break;
    case '3':
        index = 32767 + 10; /*  <-- signed short  */
        if ( index > 0 ) memcpy( dest, str, index); /*  index is always less
                                        than zero - so memcpy crashes  */
        printf(" memcpy lenght value: %d\n\n", index);
        break;
    case '4':
        index = 32767 + 10; /*  <-- signed short  */
         strncpy( dest, str, index); /*  index is always less than zero
                                         so strncpy just exits  */
        printf(" strncpy lenght value: %d\n\n", index);
        break;
    case '0':
        goto EXIT;
  }
  system("pause"); goto MENU;
EXIT:
  printf("\n Compiler:\tBorland BuilderX Personal 1.0.0.1786\n");
  printf(" Platform:\tXP Pro + SP2 (+ circa 72 patches)\n\t\tThanks for using prj 3 prog 4 !\n\n\t");
  system("pause");  system("color 0f");
  return 0;
}