#define _WITH_GETLINE
#define _SVID_SOURCE 1
#define _GNU_SOURCE
#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<sys/types.h>
#include<sys/ipc.h>
#include<sys/shm.h>
#include<errno.h>
#include<sys/stat.h>
#include<pwd.h>
#include<unistd.h>


#define MY_MSG_SIZE 101

key_t shmkey;
int   shmid;
struct my_data {
    int  typ;
    int ile;
    int ilu_klientow;
    int stala_ile;
    int z;
        char txt[100][MY_MSG_SIZE];
        char user[100][MY_MSG_SIZE];
} *shared_data;

char   *buf = NULL;
char *buf2 = NULL;
size_t bufsize = MY_MSG_SIZE;
int i;

int main(int argc, char * argv[]) {
    char tab[100];
        struct passwd *pw;
        uid_t uid;
        pw = getpwuid(uid = geteuid());
        if (pw == NULL)
        {
                perror("nie znalazlem euid\n");
                exit(1);
        }
        /*        shmkey = ftok(argv[1], 1); */
        if ((shmkey = ftok(argv[1], 1)) == -1)
        {
                perror("ftok\n");
                exit(1);
        }
        printf("Klient skargi i wnioskow wita!\n");


        if( (shmid = shmget(shmkey, 0, 0)) == -1 ) {
                printf(" blad shmget\n");
                exit(1);
        }
        shared_data = (struct my_data *) shmat(shmid, (void *)0, 0);
        if(shared_data == (struct my_data *)-1) {
                printf(" blad shmat!\n");
                exit(1);
        }

        if(shared_data -> ile < 1)
        {
                perror("brak miejsca!\n");
                exit(1);
        }
        else
        {
                if (shared_data -> ile == 1)
                        printf ("%s%d%s%d%s\n", "[Wolny ", shared_data -> ile, " wpis (na ", shared_data->stala_ile, ")]");
                else
                if (shared_data -> ile >= 2 && shared_data -> ile <= 4)
                        printf ("%s%d%s%d%s\n", "[Wolne ", shared_data -> ile, " wpisy (na ", shared_data -> stala_ile, ")]");
                else
                        printf ("%s%d%s%d%s\n", "[Wolnych ", shared_data -> ile, " wpisow (na ", shared_data->stala_ile, ")]");
        }
        if (shared_data -> ile >= 1)
        {

        printf("Napisz co ci lezy na watrobie:\n");


        getline(&buf, &bufsize, stdin);

        if(strlen(buf) > MY_MSG_SIZE)
         {
                        perror("Za dluga wiadomosc!");
                        exit(1);
          }
        else
                shared_data -> ile--;

        /* wpisywanie do pamieci dzielonej */


        shared_data->typ = 1;
        buf[strlen(buf)-1] = '\0'; /* techniczne: usuwam koniec linii */

        strcpy(tab, pw->pw_name);
        shared_data -> z++;
        shared_data -> ilu_klientow++;
        for(i = shared_data->z-1; i<shared_data->z; i++)
        {
                strcpy(shared_data -> user[i], tab);
                strcpy(shared_data -> txt[i], buf);
        }
        printf("Dziekuje za dokonanie wpisu do ksiegi\n");


        if (shmdt(shared_data)==-1)
        {
                perror("blad shmdt\n");
                exit(1);
        }
        else
                shmdt(shared_data);
        }
        return 0;

}