/*  This is the data stucture definition for the CD database.  It defines structures and sizes for the two tables that comprise  the database.  *//* The catalogue table */#define CAT_CAT_LEN       30#define CAT_TITLE_LEN     70#define CAT_TYPE_LEN      30#define CAT_ARTIST_LEN    70typedef struct {    char catalogue[CAT_CAT_LEN + 1];    char title[CAT_TITLE_LEN + 1];    char type[CAT_TYPE_LEN + 1];    char artist[CAT_ARTIST_LEN + 1];} cdc_entry;/* The tracks table, one entry per track */#define TRACK_CAT_LEN     CAT_CAT_LEN#define TRACK_TTEXT_LEN   70typedef struct {    char catalogue[TRACK_CAT_LEN + 1];    int  track_no;    char track_txt[TRACK_TTEXT_LEN + 1];} cdt_entry;/* For convenience we also put the prototype for the functions   to access the data here *//* Initialision and termination functions */int database_initialise(const int new_database);void database_close(void);/* two for simple data retrival */cdc_entry get_cdc_entry(const char *cd_catalogue_ptr);cdt_entry get_cdt_entry(const char *cd_catalogue_ptr, const int track_no);/* two for data addition */int add_cdc_entry(const cdc_entry entry_to_add);int add_cdt_entry(const cdt_entry entry_to_add);/* two for data deletion */int del_cdc_entry(const char *cd_catalogue_ptr);int del_cdt_entry(const char *cd_catalogue_ptr, const int track_no);/* one search function */cdc_entry search_cdc_entry(const char *cd_catalogue_ptr, int *first_call_ptr);