#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <pwd.h>
    #include <sys/types.h>
/*
TO_DO:
-poprawić env(ostatni składnik to null


*/
#define MAX_ARG 4

extern char **environ;
    void print_env()
    {
    int i=0;
     
     while(*environ[i++]!=0)
            printf("%s \n",environ[i]);
    }

 void print_finger(char nazwa[25])
{
    struct passwd *p;
    
    p=getpwnam(nazwa);
    printf("\n Nazwa: %s\n",p->pw_name);
    printf("Info %s\n",p->pw_gecos);
  printf("Shell: %s\n",p->pw_shell); 
 printf("Katalog domowy: %s\n",p->pw_dir);
    printf("UID: %d\n",p->pw_uid);
    printf("GID: %d\n",p->pw_gid);
    
    }




int main(void)
{
int w;
    char input[100];
    char *p;
    int done=0;
int ile_p;
// Do some error checking on the call to fgets
    while(done==0)
    {
printf("Komenda: ");
ile_p=0;
        if (fgets(input, 100, stdin) == NULL)
        {
            perror("fgets");
            exit(EXIT_FAILURE);
        }

// Check if there is a newline in the buffer.  If there is, get rid of it.

        if ((p = strchr(input, '\n')) != NULL)
        {
            *p = '\0';
        }

        char args[MAX_ARG][15];
        *args[1]=(char)0;
        int a = 0;
        int i = 0;
        int j,k = 0;
        int index = 0;
        for(k=0; k<MAX_ARG; k++)
            for( j=0; j<sizeof(args[index]); j++) args[k][j]='\0';
        while (input[a] != '\0')
        {

            if (input[a] == ' ')
            {

                args[index][i] = '\0';
                i = 0;
                a++;
                index++;
ile_p++;
            }                       // SPACE detected

            args[index][i++] = input[a++];
          
        }
        args[index][i] = '\0';

    
        if(strcmp((args[0]),"quit")==0)
        {
              d
            printf("Wychodze");

        }
else if(strcmp((args[0]),"env")==0)
{
 
w=fork();
if(w==0)

print_env();
else
waitpid(w, NULL, 0);
}
else if(strcmp((args[0]),"finger")==0 && ile_p==1)
{
 
w=fork();
if(w==0)

print_finger(args[1]);
else
waitpid(w, NULL, 0);
}
        else
        {
w=fork();
if(w==0)
{

switch(ile_p)
 {
 case 0:
 execlp(args[0],args[0],NULL);
 break;
 case 1:
 execlp(args[0],args[0],args[1],NULL);
 break;
 case 2:
 execlp(args[0],args[0],args[1],args[2],NULL);
 break;


}
}
else
{
waitpid(w, NULL, 0);
}

      }

    }
    return 0;
}