game_terminal_template.c

#include <unistd.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <termios.h>
#include <signal.h>

struct termios orig;

void term_cursor_setpos(int row, int col) {
  printf("\033[%d;%dH", row, col);
}

void term_putchar(int row, int col, char c) {
  term_cursor_setpos(row, col);
  putchar(c);
}

void term_cursor_show(int show) {
  if(show) {
    printf("\e[?25h");
  } else {
    printf("\e[?25l");
  }
}

void term_clearscreen() {
  printf("\033c");
}

void term_restore(int signal) {
  printf("da end\n");
  tcsetattr(0, TCSANOW, &orig);
  term_clearscreen();
  term_cursor_show(1);
  exit(0);
}

void term_init() {
  struct termios conf;
  tcgetattr(0, &orig); // get current terminal configuration
  conf = orig;
  conf.c_lflag &= ~(ECHO | ICANON); // disable echoing typed characters
  conf.c_cc[VMIN] = 0;
  conf.c_cc[VTIME] = 0; // nonblocking input
  tcsetattr(0, TCSANOW, &conf); // set new terminal configuration

  // restore terminal to original state on application exit
  struct sigaction action = {0};
  action.sa_handler = term_restore;
  sigaction(SIGTERM, &action, NULL);
  sigaction(SIGINT, &action, NULL);
  sigaction(SIGKILL, &action, NULL);

  setvbuf(stdout, NULL, _IONBF, 0); // disable stdout buffering

  term_clearscreen();
  term_cursor_show(0);
}

int main() {
  term_init();

  while(1) {
    // handle event
    char c;
    while(read(0, &c, 1) == 1) {
      // ctrl+c or 'q' pressed
      if(c == 3 || c == 'q') {
        return 0; // end the loop
      } else if(c == 'A') {
        printf("up\n");
      } else if(c == 'B') {
        printf("down\n");
      } else if(c == 'D') {
        printf("left\n");
      } else if(c == 'C') {
        printf("right\n");
      }
    }

    term_putchar(rand() % 10, rand() % 10, '#');

    usleep(50000);
  }
}