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

int MyExit(int ret)
{
    printf("\n");
    return ret;
}

int main(int argc, char** argv)
{
    if(argc != 2)
    {
        printf("Za dużo/mało argumentów (%d)", argc - 1);
        return MyExit(1);
    }

    char* arg = argv[1];
    int length = strlen(arg);

    if(length > 20)
    {
        printf("Za dużo znaków (%d)", length);
        return MyExit(1);
    }

    if (length == 1)
    {
        //printf("%c", arg[0]);
        return arg[0];
    }

    //printf("%s \n", arg);

    char* firstHalf = (char*)malloc(sizeof(char) * (length/2 + 1));
    char* secondHalf = (char*)malloc(sizeof(char) * (length - length/2 + 1));

    int i;

    memcpy(firstHalf, arg, length/2);
    memcpy(secondHalf, (arg + length/2), length - length/2);
    firstHalf[length/2] = '\0';
    secondHalf[length - length/2] = '\0';

    //printf("%s \n", firstHalf);
    //printf("%s \n", secondHalf);


    char** childArgs1 = malloc(sizeof(char*)*3);
    char** childArgs2 = malloc(sizeof(char*)*3);
    int wait1, wait2, ret1, ret2;


    pid_t pid_t1, pid_t2;

    pid_t1 = fork();

    if (pid_t1 == 0)
    {
        childArgs1[0] = "a.out";
        childArgs1[1] = firstHalf;
        childArgs1[2] = NULL;
        execv("a.out", childArgs1);
    }

    pid_t2 = fork();

    if(pid_t2 == 0)
    {
        childArgs2[0] = "a.out";
        childArgs2[1] = secondHalf;
        childArgs2[2] = NULL;
        execv("a.out", childArgs2);
    }

    pid_t waitresult1 = waitpid(pid_t1, &wait1, 0);
    ret1 = WEXITSTATUS(wait1);
    printf("%d %d %s %d \n", getpid(), waitresult1, firstHalf, ret1);

    pid_t waitresult2 = waitpid(pid_t2, &wait2, 0);
    ret2 = WEXITSTATUS(wait2);
    printf("%d %d %s %d \n", getpid(), waitresult2, secondHalf, ret2);


    free(firstHalf);
    free(secondHalf);
    free(childArgs1);
    free(childArgs2);

    if(ret1 > ret2)
        return ret1;
    else
        return ret2;
}