Re: realloc problem, corrupt last item

> You have not provided sufficient information for me to help you
> effectively. On general principles, lose the cast, replace sizeof(book)
> with sizeof *bp, use a temp to catch the result of realloc in case it
> fails and returns NULL, and make sure you have #included <stdlib.h>.
Note
> that bp is a copy of the calling function's pointer; the original will
not
> be updated automatically, so if you want to keep the new value you must
> provide a mechanism for the caller to assign this new value to the
> original pointer.

here's the full function.
i call it like this:

bp = AddBook(bp, &BOOK_SIZE);

/*#############################
# Add Book Function           #
#############################*/
book* AddBook(book *bp, unsigned *size)
{
	book temp;
	unsigned n = *size; //n = size of book array
	bool check = FALSE;
	char str_cn[80];
	int i;

	printf("%d", (int)(sizeof(bp)/sizeof(bp[0])));

	n++;
	bp = (book*)realloc(bp, sizeof(book));
	if (bp == NULL) { perror("ERROR [realloc - AddBook()]");
exit(ERR_REALOC); }


	printf("\n[Add Book to Catalog]\n");

	//get catalog number
	while(check != TRUE)
	{
		printf("Book Catalog Number: ");
		_flushall();
		gets(str_cn);

		//check if string is longer then 9 digits. if longer then error.
		if(strlen(str_cn) > 9) { check = FALSE; printf("[E] catalog number
too long, 9 digit max.\n"); continue; }

		//check each letter in string if a digit, if all are then check =
TRUE, else check = FALSE
		i=0;
		while(str_cn[i])
		{
			if(isdigit(str_cn[i])) { check = TRUE; i++; continue; }
			else { check = FALSE; printf("[E] catalog number not valid, try
again.\n"); break; }
		}

		if(check == TRUE) { temp.cn = atol(str_cn); } //if all OK, put value
in str_cn
	}
	check = FALSE;

	... here i get data into temp, and check validation ...

	*size = n;

	bp[n-1].cn = temp.cn;
	bp[n-1].Units = temp.Units;
	bp[n-1].Year = temp.Year;
	bp[n-1].Price.CostPrice = temp.Price.CostPrice;
	bp[n-1].Price.RetailPrice = temp.Price.RetailPrice;

	strcpy(bp[n-1].Publisher, temp.Publisher);
	strcpy(bp[n-1].BookName, temp.BookName);
	strcpy(bp[n-1].Author.Author1, temp.Author.Author1);
	strcpy(bp[n-1].Author.Author2, temp.Author.Author2);
	strcpy(bp[n-1].Author.Author3, temp.Author.Author3);

	return bp;
}