detect arrow keys in linux

arrow_keys.c

#include <stdio.h>
#include <termios.h>
#include <unistd.h>

int getch (void)
{
        int ch;
        struct termios oldt, newt;

        tcgetattr(STDIN_FILENO, &oldt);

        newt = oldt;
        newt.c_lflag &= ~(ICANON|ECHO);

        tcsetattr(STDIN_FILENO, TCSANOW, &newt);

        ch = getchar();

        tcsetattr(STDIN_FILENO, TCSANOW, &oldt);

        return ch;
}

int main()
{
    while (1) {
        int p = getch();

        if (p == 65) {
            printf("\narrow up\n");
        } else if (p == 66) {
            printf("arrow down\n");
        } else if (p == 67) {
            printf("arrow right\n");
        } else if (p == 68) {
            printf("arrow left\n");
        } else if ((p != 27) && (p != 91)) {
            putchar(p);
        }
     }
}