sbn.cassigment/tests/bookNode.c

237 lines
4.0 KiB
C

#include <stdlib.h>
#include <stdio.h>
struct book
{
char *title;
char *author;
char *isbn;
struct book *next;
};
typedef struct book BOOK;
FILE *file;
BOOK *head;
void add_book(char *title, char *author, char *isbn);
void display();
int count();
void add_book_data();
void save_book_data(struct book *data);
void read_file_to_data();
void print_data(BOOK *data);
int main()
{
head = NULL;
int countEntries = count();
printf("There are %d entries\n", countEntries);
// add book data
add_book_data();
// display the books
display();
return EXIT_SUCCESS;
}
void add_book(char *title, char *author, char *isbn)
{
struct book *temp, *iterator;
temp = (struct book *)malloc(sizeof(struct book));
temp->title = title;
temp->author = author;
temp->isbn = isbn;
// ref
iterator = head;
if (head == NULL)
{
head = temp;
head->next = NULL;
}
else
{
while (iterator->next != NULL)
{
iterator = iterator->next;
}
temp->next = NULL;
iterator->next = temp;
}
}
int count()
{
int n = 1;
BOOK *temp;
temp = head;
if (head == NULL)
{
return 0;
}
while (temp->next != NULL)
{
n++;
temp = temp->next;
}
return n;
}
void add_book_data()
{
add_book("My Third Book", "Zero 1", "000-000-111");
add_book("My Fouth Book", "1 Zero", "111-000-000");
add_book("My Fifth Book", "2 Zero", "222-000-000");
int i;
file = fopen("./data/books.txt", "a+");
if (file == NULL)
{
printf("Error: addressbook.dat could not be opened.\n");
exit(EXIT_FAILURE);
}
BOOK *temp;
temp = head;
fputs(temp->title, file);
fputs("\n", file);
fputs(temp->author, file);
fputs("\n", file);
fputs(temp->isbn, file);
while (temp->next != NULL)
{
temp = temp->next;
fputs("\n", file);
fputs(temp->title, file);
fputs("\n", file);
fputs(temp->author, file);
fputs("\n", file);
fputs(temp->isbn, file);
}
// close the file
fclose(file);
}
void save_book_data(struct book *data)
{
file = fopen("./data/books.txt", "a+");
if (file == NULL)
{
printf("Error: addressbook.dat could not be opened.\n");
exit(EXIT_FAILURE);
}
BOOK *temp;
temp = data;
if (temp == NULL)
{
return;
}
fputs(temp->title, file);
fputs(temp->author, file);
fputs(temp->isbn, file);
while (temp->next != NULL)
{
temp = temp->next;
fputs(temp->title, file);
fputs(temp->author, file);
fputs(temp->isbn, file);
}
fflush(file);
fclose(file);
}
void read_file_to_data()
{
// clear head in linked list
head = NULL;
FILE *file;
file = fopen("./data/books.txt", "r");
if (file == NULL)
{
printf("cannot read file!");
exit(EXIT_FAILURE);
}
char title[20];
char author[20];
char isbn[20];
int i;
while (!feof(file))
{
fgets(title, 20, file);
fgets(author, 20, file);
fgets(isbn, 20, file);
i = 0;
while (title[i] != '\n')
{
i++;
}
title[i] = '\0';
i = 0;
while (author[i] != '\n')
{
i++;
}
author[i] = '\0';
add_book(title, author, isbn);
}
fclose(file);
}
void display()
{
read_file_to_data();
print_data(head);
}
void print_data(BOOK *book)
{
BOOK *temp;
temp = book;
if (temp == NULL)
{
printf("book is empty!");
return;
}
printf("Book title: %s\n", temp->title);
printf("Book author: %s\n", temp->author);
printf("Book isbn: %s", temp->isbn);
while (temp->next != NULL)
{
temp = temp->next;
printf("\nBook title: %s\n", temp->title);
printf("Book title: %s\n", temp->title);
printf("Book title: %s", temp->title);
}
}