극초보의 linked list 질문입니다.

책 정보(id, name)을 추가(add)하고 삭제(remove)하고 검색(search)하고 제거(remove)하는 초보적인 프로그램을 짜보고 있는데요....

처음으로 linked list를 사용해 보았는데...인터넷에서 소스 보고 많이 많이 참고를 해가면서 첨으로 짜본건데...이상하게...3개 이상 add하면 에러나구...list도 마지막꺼는 name이 제대로 안나오구...이상하네요

사흘동안 시간날때마다 코드를 뚫어져라 보고 있는데...무엇이 문제인지...
전혀 감이 안오네요. 사실 linked list 자체도 잘 모르는 상태라...

도움 부탁드립니다.

===============================================

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

#define TRUE ( 1 )
#define FALSE ( 0 )

#define NAME_SIZ ( 10 )

#define ADD ( 1 )
#define RENT ( 2 )
#define RETURN ( 3 )
#define DISCARD ( 4 )
#define LIST ( 5 )
#define QUIT ( 6 )

#define RENTED ( 100 )
#define RETURNED ( 200 )
#define DISCARDED ( 300 )

typedef unsigned int bool;
typedef struct record BOOK;
struct record
{
char name[ NAME_SIZ ];
int id,
status;
BOOK *prev;
BOOK *next;
};

BOOK *book_head = NULL;
BOOK *book_tail = NULL;

void display_menu();
int get_menu_number();
void add_a_book();
void get_book_name( char book_name[ NAME_SIZ ] );
void get_book_id( int *book_id );
void list_all_books();
void print_a_book( BOOK *temp );

int main()
{
int menu = 0;

do
{
menu = get_menu_number();

switch( menu )
{
case ADD: add_a_book();
break;

case RENT: // borrow_a_book();
break;

case RETURN: // return_a_book();
break;

case DISCARD: //discard_a_book();
break;

case LIST: list_all_books();
break;

default: break;
}
}
while
( menu != QUIT );

return( 0 );
}

void display_menu()
{
printf( "\n" );
printf( "--------------------\n" );
printf( " a : Add a book \n" );
printf( " e : rEnt a book \n" );
printf( " r : Return a book \n" );
printf( " d : Discard a book \n" );
printf( " l : List books \n" );
printf( "--------------------\n" );
}

int get_menu_number()
{
char str[ BUFSIZ + 1 ],
dummy = ' ',
menu = ' ';
int menu_num = 0;
bool input_success = FALSE;

memset( str, 0x0000, sizeof( str ) );

do
{
display_menu();
printf( "Select? (q:quit) " );
gets( str );
if ( sscanf( str, "%c%c", &menu, &dummy ) == 1 )
if ( menu == 'a' || menu == 'r' || menu == 'e' ||
menu == 'd' || menu == 'l' || menu == 'q'
)
input_success = TRUE;
else
printf( "\nWrong menu.\n" );
else
printf( "\nWrong input.\n" );
}
while
( !input_success );

if ( menu == 'a' )
menu_num = ADD;
if ( menu == 'e' )
menu_num = RENT;
if ( menu == 'r' )
menu_num = RETURN;
if ( menu == 'd' )
menu_num = DISCARD;
if ( menu == 'l' )
menu_num = LIST;
if ( menu == 'q' )
menu_num = QUIT;

return( menu_num );
}

void add_a_book()
{
char book_name[ NAME_SIZ ];
int book_id = 0;
BOOK *book;

if( ( book = (BOOK *)malloc( sizeof( book ) ) ) == NULL )
{
fprintf( stderr,
"\nMemory allocation error!\n" );
}
else
printf( "\n%x\n", book );

memset( book_name, 0x0000, sizeof( book_name ) );
memset( book, 0x0000, sizeof( book ) );

get_book_name( book_name );
get_book_id( &book_id );

if ( book_head == NULL )
{
printf( "This is the first book.\n" );
book_head = book;
book_tail = book;
book->prev = NULL;
book->next = NULL;
}
else
{
book->prev = book_tail;
book_tail = book;
book->next = NULL;
}

strcpy( book->name, book_name );
book->id = book_id;
book->status = RETURNED;
}

void get_book_name( char book_name[ NAME_SIZ ] )
{
printf( "\nEnter book name : " );
gets( book_name );
}

void get_book_id( int *book_id )
{
char str[ BUFSIZ + 1 ],
dummy = ' ';
bool input_success = FALSE;

do
{
printf( "\nEnter book ID : " );
gets( str );
if ( sscanf( str, "%d%c", book_id, &dummy ) == 1 )
input_success = TRUE;
}
while
( !input_success );
}

void list_all_books()
{
BOOK *temp = book_head;

while( temp )
{
print_a_book( temp );
temp = temp->next;
}
}

void print_a_book( BOOK *temp )
{
printf( "\n" );
printf( "BOOK TITLE : %s\n", temp->name );
printf( "BOOK ID : %d\n", temp->id );
printf( "BOOK STATUS : %d\n", temp->status );
}