Some ncurses functionality in str8 C

gistfile1.c

#include <stdio.h>   // I/O Junk
#include <stdlib.h>  // For rand()
#include <unistd.h>  // For usleep()
#include <signal.h>  // For Signal handler

#ifdef __linux__
#include <termios.h> // To change term settings (no echo mode)
#elif _WIN32
#include <conio.h>
#else
#error "Unsupported operating system"
#endif
 
#ifdef __linux__
#define getch() getchar()

/* Where we store our old settings and make a function which is called on exit */
struct termios init_settings;
void exit_proc(void) 
{ 
    tcsetattr(STDIN_FILENO, TCSANOW, &init_settings); 
}

/* Check if we have input */
int kbhit(void)
{
    struct timeval tv = { 0 };
    fd_set fds;
    FD_ZERO(&fds);
    FD_SET(0, &fds);
    return select(1, &fds, NULL, NULL, &tv);
}
#endif

/* Catch SIGINT so the program can exit and restore modes correctly */
void signal_handler(int signo) { if (signo == SIGINT) exit(1); }

int main(void)
{
    /* Catch all SIGINT's (^C) and use it to exit program */
    signal(SIGINT, signal_handler);

    /* Print details before changing mode */
    printf("Select the speed:\n"
           "\t1 (Slow)\n"
           "\t2 (Medium)\n"
           "\t3 (Fast)\n"
           );

#ifdef __linux__
    /* Store current term settings */
    tcgetattr(STDIN_FILENO, &init_settings);
    atexit(exit_proc);

    /* Noecho mode */
    struct termios new_settings = init_settings;
    new_settings.c_lflag &= ~(ICANON | ECHO);
    tcsetattr(STDIN_FILENO, TCSANOW, &new_settings);
#endif

    int speed = 5000;   /* Default to medium */
    
    while (1) {
        if (kbhit()) { /* If we got a character in the queue deal with it */
            int c = getch();
            switch (c) {
            case '1':
                speed = 10000;
                break;
            case '2':
                speed = 5000;
                break;
            case '3':
                speed = 1000;
                break;
            default:
                ; /* Do nothing */
            }
        }
    
        usleep(speed);
        fflush(stdout);
        printf("\033[22;3%dm %d", rand() % 10, rand() % 10);
    }

    exit(0);
}