inverted_search.h

#ifndef INVERTED_SEARCH_H
#define INVERTED_SEARCH_H

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <ctype.h>
#include <errno.h>

// Defining macros
#define FAILURE        -1
#define SUCCESS         0
#define FNAME_SIZE     15
#define WORD_SIZE      10
#define FILE_EMPTY     -2
#define FILE_NOTAVAILABLE -3
#define REPEATATION    -4

// Global variable declaration
extern char fname[FNAME_SIZE];  // Declaration of fname as a global variable

// Structure for file list
typedef char data_t;
typedef struct file_node {
    data_t file_name[FNAME_SIZE];
    struct file_node *link ;
} Flist;

// Structure for link table
typedef struct linkTable_node {
    int word_count;
    data_t file_name[FNAME_SIZE];
    struct linkTable_node *table_link;
} Ltable;

// Structure to store word count
typedef struct word_node {
    int file_count;
    data_t word[WORD_SIZE];
    Ltable *Tlink;
    struct word_node *link;
} Wlist;

// Function declarations
int to_create_list_of_files(Flist **f_head, char *name);
void create_database(Flist *f_head, Wlist *head[]);
Wlist *read_datafile(Flist *file, Wlist *head[], char *filename);
int update_link_table(Wlist **head);
int insert_at_last(Wlist **head, data_t *data);
int update_word_count(Wlist **head, char *file_name);
int print_word_count(Wlist *head);
void search(Wlist *head[], char *word);
void display_database(Wlist *head[]);
void save_database(Wlist *head[]);
void write_databasefile(Wlist *head, FILE* databasefile);
void update_database(Wlist *head[], Flist **f_head);
int isFileEmpty(char *filename);
void file_validation_n_file_list(Flist **f_head, char *argv[]);
Wlist* create_wlist(void);
#endif