#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/wait.h>

char **parse_cmdline(const char *cmdline);

int main()
{
    int i;
    while(1)
    {
        printf("$ ");

        char** direction;

        size_t size=0;
        char *suffer = NULL;

        ssize_t vladi = getline(&suffer,&size,stdin);

        if( feof(stdin) ) {break;}

        suffer[strlen(suffer)-1]=' ';

        direction = parse_cmdline(suffer);
        printf("%s",direction[2]);
        free(suffer);
        pid_t pid = fork();

        if(pid < 0)
        {
            perror("fork");
        }
        else if(pid == 0)
        {
            int execv_result = execv(direction[0], direction);
            if(execv_result == -1)
            {
                perror(direction[0]);

                free(direction[0]);
                free(direction);
                exit(0);
            }
            exit(0);
        }
        else
        {
            waitpid(pid, 0, 0);
        }

        free(direction[0]);
        free(direction);
    }

    return 0;
}

char **parse_cmdline(const char *cmdline)
{
    int size = strlen(cmdline);
    char *array = malloc(size * sizeof(char));
    strcpy(array, cmdline);

    int argc = 0;
    char **array_of_strings = malloc(sizeof(char*));

    char *ptr = strtok(array, " ");

    while (ptr)
    {
        array_of_strings = realloc(array_of_strings, (argc+1) * sizeof(char*));

        array_of_strings[argc] = ptr;

        ptr = strtok(NULL, " ");

        argc++;
    }
    array_of_strings[argc] = NULL;

    return array_of_strings;
}