Programming

typedef struct client_list {
    char *client_name;
    int client_socket_fd;
    struct client_list *next;
} client;

client *client_list=NULL;

if (client_list==NULL || already_there(client_list, buffer)==0) {
    client_list = add_client(buffer, client_list, i);
}

int already_there(client *client_list, char *username) {
    if (client_list == NULL) return(0);
    else if (strcmp(client_list->client_name, username)==0) return(1);
    else return already_there(client_list->next, username);
}

client *add_client(char *username, client *client_list, int client_socket_fd) {
    client *new_client = (client *)malloc(sizeof(client)); 
    new_client->client_name = username;
    new_client->client_socket_fd = client_socket_fd;
    new_client->next = client_list;
    return new_client;
}