Input test

#include <stdio.h>
#include <limits.h>
#include <stdlib.h>
#include <pthread.h>
#include <termios.h>
#include <unistd.h>

/* reads from keypress, doesn't echo */
int getch(void)
{
    struct termios oldattr, newattr;
    int ch;
    tcgetattr( STDIN_FILENO, &oldattr );
    newattr = oldattr;
    newattr.c_lflag &= ~( ICANON | ECHO );
    tcsetattr( STDIN_FILENO, TCSANOW, &newattr );
    ch = getchar();
    tcsetattr( STDIN_FILENO, TCSANOW, &oldattr );
    return ch;
}

pthread_mutex_t m;

struct control{
    int x;
    int y;
    int *stop;
};

void* move(void* arg);
void* animation(void* arg);

int main()
{
    system("clear");
    int ch;
    pthread_t thread;
    pthread_create(&thread,NULL,move,(void*)&ch);
    ch = getch();
    while ((ch = getch()) != EOF
            && ch != '\n');
    pthread_join(thread,NULL);
    return 0;
}

void* move(void* arg)
{
    int *action = (int*)arg;
    int aux;
    pthread_t thread;
    struct control movement = {
        .x = 0,
        .y = 0,
        .stop = action
    };
    pthread_create(&thread,NULL,animation,(void*)&movement);
    do
    {
        aux = *action
        if (aux == '\n')
            break;
        switch(aux)
        {
            case 'w':
                if (movement.y > 0)
                    movement.y--;
                break;
            case 'a':
                if (movement.x > 0)
                    movement.x--;
                break;
            case 's':
                if (movement.y < 16)
                    movement.y++;
                break;
            case 'd':
                if (movement.x < 16)
                    movement.x++;
                break;
            default:
                break;
        }
        pthread_mutex_lock(&m);
        *action = 0;
        pthread_mutex_unlock(&m);
        while (*action == 0) sched_yield();
    }while (1);
    pthread_join(thread,NULL);
    return NULL;
}

void* animation(void* arg)
{
    struct control *action = (struct control*)arg;
    unsigned long long i;
    unsigned j, k;
    for (i = 0; i < ULLONG_MAX && *(action->stop) == 0; i++)
    {
        for (k = 0; k < action->y; k++)
            printf("\n");
        for (j = 0; j < action->x; j++)
            printf(" ");
        printf("O");
        for (unsigned short n = 0; n < USHRT_MAX; n++);
        sched_yield();
    }
    return NULL;
}