chat_application/main.c

#include "message.h"
#include "user.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

int num_of_lines(char* filename);
char* file_to_string(char* filename);
User* create_user_list(char* filename);

int main() {

	User* users = create_user_list("user_file.txt");

	Message message = new_message("Hello, this is a text message",users[0],users[1]);

	printf("Message was: %s\nSentfrom: %s\nSent to: %s\nWith password: %s\nSent at: %s\n",message.text, message.sender.username, message.recipient.username, message.recipient.password, asctime(&message.timeinfo));

}


User* create_user_list(char* filename) {

	/* Structure of user file - <username> <password> on every line */

	int num_users = num_of_lines(filename);
        char* file_str = file_to_string(filename);

        char* token = malloc(sizeof(char) * 30);
        User* users = calloc(num_users, sizeof(User));

        token = strtok(file_str," \r\n");
        for (int i=0;i<num_users;i++) {
                users[i].username = token;
                token = strtok(NULL," \r\n");
                users[i].password = token;
                token = strtok(NULL," \r\n");
        }

	return users;

}



char* file_to_string(char* filename) {
	FILE* fp = fopen(filename,"r");

	fseek(fp,0,SEEK_END);
	long file_size = ftell(fp);
	rewind(fp);

	char* buffer = calloc(sizeof(char),file_size+1);

	fread(buffer,1,file_size,fp);

	fclose(fp);

	return buffer;
	
}





/* Finds the number of lines in a file (Which MUST end in a new-line, if the last
   line is to be counted) */

int num_of_lines(char* filename) {

	int num_lines = 0;
	FILE* fp = fopen(filename,"r");
	
	if (fp == NULL) {
		return -1;
	}


	for (int c = getc(fp); c != EOF; c = getc(fp)) {
		if (c == '\n') {
			num_lines++;
		}
	}

	fclose(fp);

	return num_lines;

}