snake_c

public

Small snake game in C

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#define _POSIX_C_SOURCE 199309L

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

#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>

#include <sys/ioctl.h>

#include <sys/time.h>
#include <time.h>

#include <ctype.h>
#include <string.h>

#define RIGHT_CODE 'C'
#define LEFT_CODE 'D'
#define UP_CODE 'A'
#define DOWN_CODE 'B'

#define WIDTH 20
#define HEIGHT 20

#define STRING_LEN 20

#define ACTUAL_WIDTH ((WIDTH * 2) + 2)
#define ACTUAL_HEIGHT (HEIGHT + 2)

#define SPEED 100 /* in ms */

#define MAX_LENGTH 1000
#define STARTING_LENGTH 2

typedef enum { NEW_GAME, SETTINGS, EXIT, MAIN_MENU } main_menu;

typedef enum {
  NO_DIRECTION = -1,
  UP = 0,
  LEFT = 1,
  DOWN = 2,
  RIGHT = 3,
  DIRECTIONS = 4
} direction;

typedef struct selected {
  int16_t x;
  int16_t y;
} selected;

typedef struct snake {
  selected position[MAX_LENGTH];
  uint16_t length;
} snake;

void update_field(snake my_snake, char board[HEIGHT][WIDTH][STRING_LEN],
                  selected fruit);
selected new_fruit(char board[HEIGHT][WIDTH][STRING_LEN]);

bool draw_menu(main_menu menu, struct winsize window_size);

bool draw_board(char board[HEIGHT][WIDTH][STRING_LEN],
                struct winsize window_size, bool redraw, bool paused);
void draw_pause(struct winsize window_size, uint8_t field_width,
                uint8_t field_height);

direction read_direction(char *string, bool wasd_enabled);

int main(int argc, char *args[]) {

  /* command argument handling */

  if (argc > 1) {
    if (argc > 2) {
      printf("Too many parameters\n");
      goto help_info;
    }

    if (!strcmp(args[1], "-h") || !strcmp(args[1], "--help")) {

      printf("This is a small TUI snake game.\n\n");
      printf("Controls: Arrow keys/WASD to control the snake.\n");
      printf("          P to pause.\n");
      printf("          Q to quit.\n");

      return 0;
    }

    printf("Argument \"%s\" not recognized\n", args[1]);

  help_info:
    printf("Try \"-h\" or \"--help\" for more information\n");
    return 1;
  }

  /* Setting up terminal with termios */

  struct termios old, new;

  tcgetattr(STDIN_FILENO, &old);

  new = old;

  new.c_lflag &= ~(ECHO | ICANON);
  new.c_cc[VMIN] = 0;
  new.c_cc[VTIME] = 0;

  tcsetattr(STDIN_FILENO, TCSANOW, &new);

  srand(time(NULL));

  printf("\033[?25l");

  struct winsize init_size, current_size;
  ioctl(STDOUT_FILENO, TIOCGWINSZ, &init_size);
  current_size = init_size;
  bool too_small = false;

  struct timeval start;
  gettimeofday(&start, NULL);

  /* Menu */

  bool menu = true;

  main_menu selected_menu = NEW_GAME;

  too_small = draw_menu(selected_menu, init_size);

  while (menu) {

    bool pressed_enter = false;
    bool changed_selected = false;

    char string[1000] = {};
    ssize_t length_string = read(STDIN_FILENO, string, sizeof(string) - 1);

    direction arrow = NO_DIRECTION;

    /* Check for window size */

    struct timeval current;
    gettimeofday(&current, NULL);

    uint64_t time_diff = (current.tv_sec - start.tv_sec) * 1000000 +
                         (current.tv_usec - start.tv_usec);

    if (time_diff >= SPEED * 1000) {

      ioctl(STDOUT_FILENO, TIOCGWINSZ, &current_size);

      if (current_size.ws_col != init_size.ws_col ||
          current_size.ws_row != init_size.ws_row) {
        init_size = current_size;
        changed_selected = true;
      }
    }

    if (length_string > 0 && !too_small) {
      string[length_string] = '\0';

      arrow = read_direction(string, false);

      switch (arrow) {
      case UP:
        selected_menu = (selected_menu + (MAIN_MENU - 1)) % MAIN_MENU;
        changed_selected = true;
        break;
      case DOWN:
        selected_menu = (selected_menu + 1) % MAIN_MENU;
        changed_selected = true;
        break;
      default:
        break;
      }

      if (toupper(string[0]) == 'Q')
        goto end_of_program;

      if (string[0] == '\n')
        pressed_enter = true;
    }

    if (changed_selected)
      too_small = draw_menu(selected_menu, init_size);

    if (pressed_enter) {
      switch (selected_menu) {
      case NEW_GAME:
        menu = false;
        break;
      default:
        goto end_of_program;
        break;
      }
    }
  }

  /* initialisation of the game */

  snake my_snake = {};
  my_snake.length = STARTING_LENGTH;

  {
    uint16_t i;

    my_snake.position[0].y = HEIGHT >> 1;
    my_snake.position[0].x = WIDTH >> 1;
    for (i = 1; i < my_snake.length; i++) {
      my_snake.position[i].y = -1;
      my_snake.position[i].x = -1;
    }
  }

  selected fruit = {-1, -1};
  char board[HEIGHT][WIDTH][STRING_LEN] = {};

  update_field(my_snake, board, fruit);

  fruit = new_fruit(board);
  update_field(my_snake, board, fruit);

  bool paused = false;

  if ((too_small = draw_board(board, current_size, true, false)))
    paused = true;

  direction shift = RIGHT;
  direction tmp_direction = shift;

  bool run = true;

  /* start of the actual game loop */

  struct timespec mili100 = {0, 100000000};

  while (run) {

    /* input handling  */

    if (!too_small) {
      char string[1000] = {};
      ssize_t length_string = read(STDIN_FILENO, string, sizeof(string) - 1);

      if (length_string > 0) {
        string[length_string] = '\0';

        if (!paused)
          tmp_direction = read_direction(string, true);

        if (toupper(string[0]) == 'Q')
          run = false;

        if (toupper(string[0]) == 'P') {
          paused = !paused;
          if (paused)
            draw_board(board, current_size, true, paused);
        }
      }
    }

    /* game logic */

    struct timeval current;
    gettimeofday(&current, NULL);

    uint64_t time_diff = (current.tv_sec - start.tv_sec) * 1000000 +
                         (current.tv_usec - start.tv_usec);

    if (/*time_diff >= SPEED * 1000*/ true) {

      ioctl(STDOUT_FILENO, TIOCGWINSZ, &current_size);

      if (current_size.ws_col != init_size.ws_col ||
          current_size.ws_row != init_size.ws_row) {
        init_size = current_size;

        paused = true;
        too_small = draw_board(board, current_size, true, paused);
      }

      if (!paused) {

        start = current;
        if (tmp_direction != NO_DIRECTION &&
            ((shift + (DIRECTIONS >> 1)) % DIRECTIONS) != tmp_direction) {
          shift = tmp_direction;
        }

        uint16_t i;
        for (i = my_snake.length; i > 0; i--) {
          my_snake.position[i].y = my_snake.position[i - 1].y;
          my_snake.position[i].x = my_snake.position[i - 1].x;
        }

        switch (shift) {
        case UP:
          my_snake.position[0].y =
              ((my_snake.position[0].y + HEIGHT - 1) % HEIGHT);
          break;
        case DOWN:
          my_snake.position[0].y = ((my_snake.position[0].y + 1) % HEIGHT);
          break;
        case LEFT:
          my_snake.position[0].x =
              ((my_snake.position[0].x + WIDTH - 1) % WIDTH);
          break;
        case RIGHT:
          my_snake.position[0].x = ((my_snake.position[0].x + 1) % WIDTH);
          break;
        default:
          goto end_of_program;
          break;
        }

        uint8_t head_y = my_snake.position[0].y;
        uint8_t head_x = my_snake.position[0].x;

        for (i = 1; i < my_snake.length; i++) {
          int16_t x = my_snake.position[i].x;
          int16_t y = my_snake.position[i].y;

          if (x == head_x && y == head_y) {
            printf("\n\nHAHA LOST!!!\n\n");
            goto end_of_program;
          }
        }

        update_field(my_snake, board, fruit);

        if (head_y == fruit.y && head_x == fruit.x) {
          my_snake.length++;
          fruit = new_fruit(board);
        }

        update_field(my_snake, board, fruit);
        draw_board(board, current_size, false, false);
      }
    }
    nanosleep(&mili100, NULL);
  }

end_of_program:

  tcsetattr(STDIN_FILENO, TCSANOW, &old);
  printf("\033[?25h\n\n");

  return 0;
}

void update_field(snake my_snake, char board[HEIGHT][WIDTH][STRING_LEN],
                  selected fruit) {

  uint8_t i, j;

  for (i = 0; i < HEIGHT; i++) {
    for (j = 0; j < WIDTH; j++) {
      strcpy(board[i][j], "  ");
    }
  }

  for (i = 0; i < my_snake.length; i++) {
    int16_t x = my_snake.position[i].x;
    int16_t y = my_snake.position[i].y;
    if (x >= 0 && y >= 0) {
      if (!i) {
        if (x == (my_snake.position[i + 1].x + 1) % WIDTH) {
          strcpy(board[y][x], "\033[33m═\033[31mX\033[0m");
        } else {
          strcpy(board[y][x], "\033[31m X\033[0m");
        }
      } else if (i == my_snake.length - 1) {
        if (x != my_snake.position[i - 1].x) {
          strcpy(board[y][x], "\033[33m══\033[0m");
        } else {
          strcpy(board[y][x], "\033[33m ║\033[0m");
        }
      } else {
        if (x != my_snake.position[i - 1].x &&
            x != my_snake.position[i + 1].x) {
          strcpy(board[y][x], "\033[33m══\033[0m");
        } else if (y != my_snake.position[i - 1].y &&
                   y != my_snake.position[i + 1].y) {
          strcpy(board[y][x], "\033[33m ║\033[0m");
        } else if ((y == (my_snake.position[i - 1].y + 1) % HEIGHT &&
                    x == (my_snake.position[i + 1].x + 1) % WIDTH) ||
                   (y == (my_snake.position[i + 1].y + 1) % HEIGHT &&
                    x == (my_snake.position[i - 1].x + 1) % WIDTH)) {
          strcpy(board[y][x], "\033[33m═╝\033[0m");
        } else if ((y == (my_snake.position[i - 1].y + (HEIGHT - 1)) % HEIGHT &&
                    x == (my_snake.position[i + 1].x + 1) % WIDTH) ||
                   (y == (my_snake.position[i + 1].y + HEIGHT - 1) % HEIGHT &&
                    x == (my_snake.position[i - 1].x + 1) % WIDTH)) {
          strcpy(board[y][x], "\033[33m═╗\033[0m");
        } else if ((y == (my_snake.position[i - 1].y + 1) % HEIGHT &&
                    x == (my_snake.position[i + 1].x + (WIDTH - 1)) % WIDTH) ||
                   (y == (my_snake.position[i + 1].y + 1) % HEIGHT &&
                    x == (my_snake.position[i - 1].x + (WIDTH - 1)) % WIDTH)) {
          strcpy(board[y][x], "\033[33m ╚\033[0m");
        } else if ((y == (my_snake.position[i - 1].y + (HEIGHT - 1)) % HEIGHT &&
                    x == (my_snake.position[i + 1].x + (WIDTH - 1)) % WIDTH) ||
                   (y == (my_snake.position[i + 1].y + (HEIGHT - 1)) % HEIGHT &&
                    x == (my_snake.position[i - 1].x + (WIDTH - 1)) % WIDTH)) {
          strcpy(board[y][x], "\033[33m ╔\033[0m");
        }
      }
    }
  }

  if (fruit.x >= 0 && fruit.y >= 0)
    strcpy(board[fruit.y][fruit.x], "\033[32m O\033[0m");
}

selected new_fruit(char board[HEIGHT][WIDTH][STRING_LEN]) {
  bool found_space = false;

  uint8_t x;
  uint8_t y;

  while (!found_space) {
    x = rand() % WIDTH;
    y = rand() % HEIGHT;

    if (!strcmp(board[y][x], "  "))
      found_space = true;
  }

  selected fruit = {x, y};

  return fruit;
}

bool draw_menu(main_menu menu, struct winsize window_size) {

  char *menu_string[] = {"NEW GAME", "SETTINGS", "EXIT"};

  const uint8_t width_small = 8;
  const uint8_t height_small = 5;

  char *menu_string_big[][6] = {
      {"███╗   ██╗███████╗██╗    ██╗     ██████╗  █████╗ ███╗   ███╗███████╗",
       "████╗  ██║██╔════╝██║    ██║    ██╔════╝ ██╔══██╗████╗ ████║██╔════╝",
       "██╔██╗ ██║█████╗  ██║ █╗ ██║    ██║  ███╗███████║██╔████╔██║█████╗  ",
       "██║╚██╗██║██╔══╝  ██║███╗██║    ██║   ██║██╔══██║██║╚██╔╝██║██╔══╝  ",
       "██║ ╚████║███████╗╚███╔███╔╝    ╚██████╔╝██║  ██║██║ ╚═╝ ██║███████╗",
       "╚═╝  ╚═══╝╚══════╝ ╚══╝╚══╝      ╚═════╝ ╚═╝  ╚═╝╚═╝     ╚═╝╚══════╝"},
      {"███████╗███████╗████████╗████████╗██╗███╗   ██╗ ██████╗ ███████╗",
       "██╔════╝██╔════╝╚══██╔══╝╚══██╔══╝██║████╗  ██║██╔════╝ ██╔════╝",
       "███████╗█████╗     ██║      ██║   ██║██╔██╗ ██║██║  ███╗███████╗",
       "╚════██║██╔══╝     ██║      ██║   ██║██║╚██╗██║██║   ██║╚════██║",
       "███████║███████╗   ██║      ██║   ██║██║ ╚████║╚██████╔╝███████║",
       "╚══════╝╚══════╝   ╚═╝      ╚═╝   ╚═╝╚═╝  ╚═══╝ ╚═════╝ ╚══════╝"},
      {"███████╗██╗  ██╗██╗████████╗", "██╔════╝╚██╗██╔╝██║╚══██╔══╝",
       "█████╗   ╚███╔╝ ██║   ██║   ", "██╔══╝   ██╔██╗ ██║   ██║   ",
       "███████╗██╔╝ ██╗██║   ██║   ", "╚══════╝╚═╝  ╚═╝╚═╝   ╚═╝   "}};

  const uint8_t height_line = 6;
  const uint8_t height_space = 2;

  const uint8_t width_text[] = {68, 64, 28};

  const uint8_t width_big = width_text[0] /*strlen(menu_string_big[0][0])*/;
  const uint8_t height_big =
      height_line * MAIN_MENU + height_space * (MAIN_MENU - 1);

  printf("\033[2J\033[H");

  if (window_size.ws_row < height_small || window_size.ws_col < width_small) {
    printf("Too small\n");
    return true;
  }

  uint8_t i, j, k;

  if (window_size.ws_row >= height_big && window_size.ws_col >= width_big) {

    uint8_t vertical_buffer = (window_size.ws_row - height_big) >> 1;

    for (i = 0; i < vertical_buffer; i++)
      printf("\n");

    for (i = 0; i < MAIN_MENU; i++) {

      if (i == menu)
        printf("\033[32m");

      uint8_t horizontal_buffer = (window_size.ws_col - width_text[i]) >> 1;

      for (j = 0; j < height_line; j++) {

        for (k = 0; k < horizontal_buffer; k++)
          printf(" ");

        printf("%s", menu_string_big[i][j]);

        if (j != height_line - 1)
          printf("\n");
      }

      printf("\033[0m");

      if (i != MAIN_MENU - 1)
        printf("\n\n");
    }

  } else {

    uint8_t vertical_buffer = (window_size.ws_row - height_small) >> 1;

    for (i = 0; i < vertical_buffer; i++)
      printf("\n");

    for (i = 0; i < MAIN_MENU; i++) {
      if (i == menu)
        printf("\033[32m");

      uint8_t horizontal_buffer =
          (window_size.ws_col - strlen(menu_string[i])) >> 1;

      for (j = 0; j < horizontal_buffer; j++)
        printf(" ");

      printf("%s\033[0m", menu_string[i]);

      if (i != MAIN_MENU - 1)
        printf("\n\n");
    }
  }

  fflush(stdout);
  return false;
}

bool draw_board(char board[HEIGHT][WIDTH][STRING_LEN],
                struct winsize window_size, bool redraw, bool paused) {

  uint8_t i, j;

  uint8_t actual_height = HEIGHT + 2;
  uint8_t actual_width = WIDTH * 2 + 2;

  if (actual_width > window_size.ws_col || actual_height > window_size.ws_row) {

    printf("\033[2J\033[HToo small\n");
    printf("Min width: %i & Min height: %i\n", actual_height, actual_width);

    return true;
  }

  uint8_t vertical_buffer = (window_size.ws_row - actual_height) >> 1;
  uint8_t horizontal_buffer = (window_size.ws_col - actual_width) >> 1;

  if (redraw) {
    printf("\033[2J\033[H");
    for (i = 0; i < vertical_buffer; i++)
      printf("\n");
  } else {
    for (i = 0; i < actual_height - 1; i++)
      printf("\033[%c", UP_CODE);
    printf("\r");
  }

  for (i = 0; i < horizontal_buffer; i++)
    printf(" ");
  printf("+");
  for (i = 0; i < WIDTH; i++)
    printf("--");
  printf("+\n");

  for (i = 0; i < HEIGHT; i++) {

    for (j = 0; j < horizontal_buffer; j++)
      printf(" ");

    printf("|");

    for (j = 0; j < WIDTH; j++)
      printf("%s", board[i][j]);

    printf("|\n");
  }

  for (i = 0; i < horizontal_buffer; i++)
    printf(" ");
  printf("+");
  for (i = 0; i < WIDTH; i++)
    printf("--");
  printf("+");

  if (paused)
    draw_pause(window_size, actual_width, actual_height);

  fflush(stdout);

  return false;
}

void draw_pause(struct winsize window_size, uint8_t field_width,
                uint8_t field_height) {

  const uint8_t height = 5;
  const uint8_t width = 14;

  const char *pause_menu[] = {"+------------+", "|            |",
                              "|   PAUSED   |", "|            |",
                              "+------------+"};

  const uint8_t going_up = (field_height + height) >> 1;
  const uint8_t going_right = (field_width - width) >> 1;

  const uint8_t horizontal_buffer = (window_size.ws_col - field_width) >> 1;

  uint8_t i, j;

  for (i = 0; i < going_up; i++)
    printf("\033[%c", UP_CODE);
  printf("\r");

  for (i = 0; i < height; i++) {
    for (j = 0; j < horizontal_buffer; j++)
      printf("\033[%c", RIGHT_CODE);
    for (j = 0; j < going_right; j++)
      printf("\033[%c", RIGHT_CODE);

    printf("\033[37m%s\033[0m\033[%c\r", pause_menu[i], DOWN_CODE);
  }

  for (i = 0; i < going_up - height; i++)
    printf("\033[%c", DOWN_CODE);
  printf("\r");

  fflush(stdout);
}

direction read_direction(char *string, bool wasd_enabled) {

  if (strlen(string) >= 3) {
    if (string[0] == '\033') {
      if (string[1] == '[') {

        switch (string[2]) {
        case RIGHT_CODE:
          return RIGHT;
          break;
        case LEFT_CODE:
          return LEFT;
          break;
        case UP_CODE:
          return UP;
          break;
        case DOWN_CODE:
          return DOWN;
          break;
        }
      }
    }
  }

  if (wasd_enabled) {
    switch (toupper(string[0])) {
    case 'A':
      return LEFT;
      break;
    case 'D':
      return RIGHT;
      break;
    case 'W':
      return UP;
      break;
    case 'S':
      return DOWN;
      break;
    }
  }

  return NO_DIRECTION;
}

1	#define _POSIX_C_SOURCE 199309L
2
3	#include <termios.h>
4	#include <unistd.h>
5
6	#include <stdbool.h>
7	#include <stdint.h>
8	#include <stdio.h>
9	#include <stdlib.h>
10
11	#include <sys/ioctl.h>
12
13	#include <sys/time.h>
14	#include <time.h>
15
16	#include <ctype.h>
17	#include <string.h>
18
19	#define RIGHT_CODE 'C'
20	#define LEFT_CODE 'D'
21	#define UP_CODE 'A'
22	#define DOWN_CODE 'B'
23
24	#define WIDTH 20
25	#define HEIGHT 20
26
27	#define STRING_LEN 20
28
29	#define ACTUAL_WIDTH ((WIDTH * 2) + 2)
30	#define ACTUAL_HEIGHT (HEIGHT + 2)
31
32	#define SPEED 100 /* in ms */
33
34	#define MAX_LENGTH 1000
35	#define STARTING_LENGTH 2
36
37	typedef enum { NEW_GAME, SETTINGS, EXIT, MAIN_MENU } main_menu;
38
39	typedef enum {
40	NO_DIRECTION = -1,
41	UP = 0,
42	LEFT = 1,
43	DOWN = 2,
44	RIGHT = 3,
45	DIRECTIONS = 4
46	} direction;
47
48	typedef struct selected {
49	int16_t x;
50	int16_t y;
51	} selected;
52
53	typedef struct snake {
54	selected position[MAX_LENGTH];
55	uint16_t length;
56	} snake;
57
58	void update_field(snake my_snake, char board[HEIGHT][WIDTH][STRING_LEN],
59	selected fruit);
60	selected new_fruit(char board[HEIGHT][WIDTH][STRING_LEN]);
61
62	bool draw_menu(main_menu menu, struct winsize window_size);
63
64	bool draw_board(char board[HEIGHT][WIDTH][STRING_LEN],
65	struct winsize window_size, bool redraw, bool paused);
66	void draw_pause(struct winsize window_size, uint8_t field_width,
67	uint8_t field_height);
68
69	direction read_direction(char *string, bool wasd_enabled);
70
71	int main(int argc, char *args[]) {
72
73	/* command argument handling */
74
75	if (argc > 1) {
76	if (argc > 2) {
77	printf("Too many parameters\n");
78	goto help_info;
79	}
80
81	if (!strcmp(args[1], "-h") \|\| !strcmp(args[1], "--help")) {
82
83	printf("This is a small TUI snake game.\n\n");
84	printf("Controls: Arrow keys/WASD to control the snake.\n");
85	printf(" P to pause.\n");
86	printf(" Q to quit.\n");
87
88	return 0;
89	}
90
91	printf("Argument \"%s\" not recognized\n", args[1]);
92
93	help_info:
94	printf("Try \"-h\" or \"--help\" for more information\n");
95	return 1;
96	}
97
98	/* Setting up terminal with termios */
99
100	struct termios old, new;
101
102	tcgetattr(STDIN_FILENO, &old);
103
104	new = old;
105
106	new.c_lflag &= ~(ECHO \| ICANON);
107	new.c_cc[VMIN] = 0;
108	new.c_cc[VTIME] = 0;
109
110	tcsetattr(STDIN_FILENO, TCSANOW, &new);
111
112	srand(time(NULL));
113
114	printf("\033[?25l");
115
116	struct winsize init_size, current_size;
117	ioctl(STDOUT_FILENO, TIOCGWINSZ, &init_size);
118	current_size = init_size;
119	bool too_small = false;
120
121	struct timeval start;
122	gettimeofday(&start, NULL);
123
124	/* Menu */
125
126	bool menu = true;
127
128	main_menu selected_menu = NEW_GAME;
129
130	too_small = draw_menu(selected_menu, init_size);
131
132	while (menu) {
133
134	bool pressed_enter = false;
135	bool changed_selected = false;
136
137	char string[1000] = {};
138	ssize_t length_string = read(STDIN_FILENO, string, sizeof(string) - 1);
139
140	direction arrow = NO_DIRECTION;
141
142	/* Check for window size */
143
144	struct timeval current;
145	gettimeofday(&current, NULL);
146
147	uint64_t time_diff = (current.tv_sec - start.tv_sec) * 1000000 +
148	(current.tv_usec - start.tv_usec);
149
150	if (time_diff >= SPEED * 1000) {
151
152	ioctl(STDOUT_FILENO, TIOCGWINSZ, &current_size);
153
154	if (current_size.ws_col != init_size.ws_col \|\|
155	current_size.ws_row != init_size.ws_row) {
156	init_size = current_size;
157	changed_selected = true;
158	}
159	}
160
161	if (length_string > 0 && !too_small) {
162	string[length_string] = '\0';
163
164	arrow = read_direction(string, false);
165
166	switch (arrow) {
167	case UP:
168	selected_menu = (selected_menu + (MAIN_MENU - 1)) % MAIN_MENU;
169	changed_selected = true;
170	break;
171	case DOWN:
172	selected_menu = (selected_menu + 1) % MAIN_MENU;
173	changed_selected = true;
174	break;
175	default:
176	break;
177	}
178
179	if (toupper(string[0]) == 'Q')
180	goto end_of_program;
181
182	if (string[0] == '\n')
183	pressed_enter = true;
184	}
185
186	if (changed_selected)
187	too_small = draw_menu(selected_menu, init_size);
188
189	if (pressed_enter) {
190	switch (selected_menu) {
191	case NEW_GAME:
192	menu = false;
193	break;
194	default:
195	goto end_of_program;
196	break;
197	}
198	}
199	}
200
201	/* initialisation of the game */
202
203	snake my_snake = {};
204	my_snake.length = STARTING_LENGTH;
205
206	{
207	uint16_t i;
208
209	my_snake.position[0].y = HEIGHT >> 1;
210	my_snake.position[0].x = WIDTH >> 1;
211	for (i = 1; i < my_snake.length; i++) {
212	my_snake.position[i].y = -1;
213	my_snake.position[i].x = -1;
214	}
215	}
216
217	selected fruit = {-1, -1};
218	char board[HEIGHT][WIDTH][STRING_LEN] = {};
219
220	update_field(my_snake, board, fruit);
221
222	fruit = new_fruit(board);
223	update_field(my_snake, board, fruit);
224
225	bool paused = false;
226
227	if ((too_small = draw_board(board, current_size, true, false)))
228	paused = true;
229
230	direction shift = RIGHT;
231	direction tmp_direction = shift;
232
233	bool run = true;
234
235	/* start of the actual game loop */
236
237	struct timespec mili100 = {0, 100000000};
238
239	while (run) {
240
241	/* input handling */
242
243	if (!too_small) {
244	char string[1000] = {};
245	ssize_t length_string = read(STDIN_FILENO, string, sizeof(string) - 1);
246
247	if (length_string > 0) {
248	string[length_string] = '\0';
249
250	if (!paused)
251	tmp_direction = read_direction(string, true);
252
253	if (toupper(string[0]) == 'Q')
254	run = false;
255
256	if (toupper(string[0]) == 'P') {
257	paused = !paused;
258	if (paused)
259	draw_board(board, current_size, true, paused);
260	}
261	}
262	}
263
264	/* game logic */
265
266	struct timeval current;
267	gettimeofday(&current, NULL);
268
269	uint64_t time_diff = (current.tv_sec - start.tv_sec) * 1000000 +
270	(current.tv_usec - start.tv_usec);
271
272	if (/time_diff >= SPEED 1000*/ true) {
273
274	ioctl(STDOUT_FILENO, TIOCGWINSZ, &current_size);
275
276	if (current_size.ws_col != init_size.ws_col \|\|
277	current_size.ws_row != init_size.ws_row) {
278	init_size = current_size;
279
280	paused = true;
281	too_small = draw_board(board, current_size, true, paused);
282	}
283
284	if (!paused) {
285
286	start = current;
287	if (tmp_direction != NO_DIRECTION &&
288	((shift + (DIRECTIONS >> 1)) % DIRECTIONS) != tmp_direction) {
289	shift = tmp_direction;
290	}
291
292	uint16_t i;
293	for (i = my_snake.length; i > 0; i--) {
294	my_snake.position[i].y = my_snake.position[i - 1].y;
295	my_snake.position[i].x = my_snake.position[i - 1].x;
296	}
297
298	switch (shift) {
299	case UP:
300	my_snake.position[0].y =
301	((my_snake.position[0].y + HEIGHT - 1) % HEIGHT);
302	break;
303	case DOWN:
304	my_snake.position[0].y = ((my_snake.position[0].y + 1) % HEIGHT);
305	break;
306	case LEFT:
307	my_snake.position[0].x =
308	((my_snake.position[0].x + WIDTH - 1) % WIDTH);
309	break;
310	case RIGHT:
311	my_snake.position[0].x = ((my_snake.position[0].x + 1) % WIDTH);
312	break;
313	default:
314	goto end_of_program;
315	break;
316	}
317
318	uint8_t head_y = my_snake.position[0].y;
319	uint8_t head_x = my_snake.position[0].x;
320
321	for (i = 1; i < my_snake.length; i++) {
322	int16_t x = my_snake.position[i].x;
323	int16_t y = my_snake.position[i].y;
324
325	if (x == head_x && y == head_y) {
326	printf("\n\nHAHA LOST!!!\n\n");
327	goto end_of_program;
328	}
329	}
330
331	update_field(my_snake, board, fruit);
332
333	if (head_y == fruit.y && head_x == fruit.x) {
334	my_snake.length++;
335	fruit = new_fruit(board);
336	}
337
338	update_field(my_snake, board, fruit);
339	draw_board(board, current_size, false, false);
340	}
341	}
342	nanosleep(&mili100, NULL);
343	}
344
345	end_of_program:
346
347	tcsetattr(STDIN_FILENO, TCSANOW, &old);
348	printf("\033[?25h\n\n");
349
350	return 0;
351	}
352
353	void update_field(snake my_snake, char board[HEIGHT][WIDTH][STRING_LEN],
354	selected fruit) {
355
356	uint8_t i, j;
357
358	for (i = 0; i < HEIGHT; i++) {
359	for (j = 0; j < WIDTH; j++) {
360	strcpy(board[i][j], " ");
361	}
362	}
363
364	for (i = 0; i < my_snake.length; i++) {
365	int16_t x = my_snake.position[i].x;
366	int16_t y = my_snake.position[i].y;
367	if (x >= 0 && y >= 0) {
368	if (!i) {
369	if (x == (my_snake.position[i + 1].x + 1) % WIDTH) {
370	strcpy(board[y][x], "\033[33m═\033[31mX\033[0m");
371	} else {
372	strcpy(board[y][x], "\033[31m X\033[0m");
373	}
374	} else if (i == my_snake.length - 1) {
375	if (x != my_snake.position[i - 1].x) {
376	strcpy(board[y][x], "\033[33m══\033[0m");
377	} else {
378	strcpy(board[y][x], "\033[33m ║\033[0m");
379	}
380	} else {
381	if (x != my_snake.position[i - 1].x &&
382	x != my_snake.position[i + 1].x) {
383	strcpy(board[y][x], "\033[33m══\033[0m");
384	} else if (y != my_snake.position[i - 1].y &&
385	y != my_snake.position[i + 1].y) {
386	strcpy(board[y][x], "\033[33m ║\033[0m");
387	} else if ((y == (my_snake.position[i - 1].y + 1) % HEIGHT &&
388	x == (my_snake.position[i + 1].x + 1) % WIDTH) \|\|
389	(y == (my_snake.position[i + 1].y + 1) % HEIGHT &&
390	x == (my_snake.position[i - 1].x + 1) % WIDTH)) {
391	strcpy(board[y][x], "\033[33m═╝\033[0m");
392	} else if ((y == (my_snake.position[i - 1].y + (HEIGHT - 1)) % HEIGHT &&
393	x == (my_snake.position[i + 1].x + 1) % WIDTH) \|\|
394	(y == (my_snake.position[i + 1].y + HEIGHT - 1) % HEIGHT &&
395	x == (my_snake.position[i - 1].x + 1) % WIDTH)) {
396	strcpy(board[y][x], "\033[33m═╗\033[0m");
397	} else if ((y == (my_snake.position[i - 1].y + 1) % HEIGHT &&
398	x == (my_snake.position[i + 1].x + (WIDTH - 1)) % WIDTH) \|\|
399	(y == (my_snake.position[i + 1].y + 1) % HEIGHT &&
400	x == (my_snake.position[i - 1].x + (WIDTH - 1)) % WIDTH)) {
401	strcpy(board[y][x], "\033[33m ╚\033[0m");
402	} else if ((y == (my_snake.position[i - 1].y + (HEIGHT - 1)) % HEIGHT &&
403	x == (my_snake.position[i + 1].x + (WIDTH - 1)) % WIDTH) \|\|
404	(y == (my_snake.position[i + 1].y + (HEIGHT - 1)) % HEIGHT &&
405	x == (my_snake.position[i - 1].x + (WIDTH - 1)) % WIDTH)) {
406	strcpy(board[y][x], "\033[33m ╔\033[0m");
407	}
408	}
409	}
410	}
411
412	if (fruit.x >= 0 && fruit.y >= 0)
413	strcpy(board[fruit.y][fruit.x], "\033[32m O\033[0m");
414	}
415
416	selected new_fruit(char board[HEIGHT][WIDTH][STRING_LEN]) {
417	bool found_space = false;
418
419	uint8_t x;
420	uint8_t y;
421
422	while (!found_space) {
423	x = rand() % WIDTH;
424	y = rand() % HEIGHT;
425
426	if (!strcmp(board[y][x], " "))
427	found_space = true;
428	}
429
430	selected fruit = {x, y};
431
432	return fruit;
433	}
434
435	bool draw_menu(main_menu menu, struct winsize window_size) {
436
437	char *menu_string[] = {"NEW GAME", "SETTINGS", "EXIT"};
438
439	const uint8_t width_small = 8;
440	const uint8_t height_small = 5;
441
442	char *menu_string_big[][6] = {
443	{"███╗ ██╗███████╗██╗ ██╗ ██████╗ █████╗ ███╗ ███╗███████╗",
444	"████╗ ██║██╔════╝██║ ██║ ██╔════╝ ██╔══██╗████╗ ████║██╔════╝",
445	"██╔██╗ ██║█████╗ ██║ █╗ ██║ ██║ ███╗███████║██╔████╔██║█████╗ ",
446	"██║╚██╗██║██╔══╝ ██║███╗██║ ██║ ██║██╔══██║██║╚██╔╝██║██╔══╝ ",
447	"██║ ╚████║███████╗╚███╔███╔╝ ╚██████╔╝██║ ██║██║ ╚═╝ ██║███████╗",
448	"╚═╝ ╚═══╝╚══════╝ ╚══╝╚══╝ ╚═════╝ ╚═╝ ╚═╝╚═╝ ╚═╝╚══════╝"},
449	{"███████╗███████╗████████╗████████╗██╗███╗ ██╗ ██████╗ ███████╗",
450	"██╔════╝██╔════╝╚══██╔══╝╚══██╔══╝██║████╗ ██║██╔════╝ ██╔════╝",
451	"███████╗█████╗ ██║ ██║ ██║██╔██╗ ██║██║ ███╗███████╗",
452	"╚════██║██╔══╝ ██║ ██║ ██║██║╚██╗██║██║ ██║╚════██║",
453	"███████║███████╗ ██║ ██║ ██║██║ ╚████║╚██████╔╝███████║",
454	"╚══════╝╚══════╝ ╚═╝ ╚═╝ ╚═╝╚═╝ ╚═══╝ ╚═════╝ ╚══════╝"},
455	{"███████╗██╗ ██╗██╗████████╗", "██╔════╝╚██╗██╔╝██║╚══██╔══╝",
456	"█████╗ ╚███╔╝ ██║ ██║ ", "██╔══╝ ██╔██╗ ██║ ██║ ",
457	"███████╗██╔╝ ██╗██║ ██║ ", "╚══════╝╚═╝ ╚═╝╚═╝ ╚═╝ "}};
458
459	const uint8_t height_line = 6;
460	const uint8_t height_space = 2;
461
462	const uint8_t width_text[] = {68, 64, 28};
463
464	const uint8_t width_big = width_text[0] /strlen(menu_string_big[0][0])/;
465	const uint8_t height_big =
466	height_line * MAIN_MENU + height_space * (MAIN_MENU - 1);
467
468	printf("\033[2J\033[H");
469
470	if (window_size.ws_row < height_small \|\| window_size.ws_col < width_small) {
471	printf("Too small\n");
472	return true;
473	}
474
475	uint8_t i, j, k;
476
477	if (window_size.ws_row >= height_big && window_size.ws_col >= width_big) {
478
479	uint8_t vertical_buffer = (window_size.ws_row - height_big) >> 1;
480
481	for (i = 0; i < vertical_buffer; i++)
482	printf("\n");
483
484	for (i = 0; i < MAIN_MENU; i++) {
485
486	if (i == menu)
487	printf("\033[32m");
488
489	uint8_t horizontal_buffer = (window_size.ws_col - width_text[i]) >> 1;
490
491	for (j = 0; j < height_line; j++) {
492
493	for (k = 0; k < horizontal_buffer; k++)
494	printf(" ");
495
496	printf("%s", menu_string_big[i][j]);
497
498	if (j != height_line - 1)
499	printf("\n");
500	}
501
502	printf("\033[0m");
503
504	if (i != MAIN_MENU - 1)
505	printf("\n\n");
506	}
507
508	} else {
509
510	uint8_t vertical_buffer = (window_size.ws_row - height_small) >> 1;
511
512	for (i = 0; i < vertical_buffer; i++)
513	printf("\n");
514
515	for (i = 0; i < MAIN_MENU; i++) {
516	if (i == menu)
517	printf("\033[32m");
518
519	uint8_t horizontal_buffer =
520	(window_size.ws_col - strlen(menu_string[i])) >> 1;
521
522	for (j = 0; j < horizontal_buffer; j++)
523	printf(" ");
524
525	printf("%s\033[0m", menu_string[i]);
526
527	if (i != MAIN_MENU - 1)
528	printf("\n\n");
529	}
530	}
531
532	fflush(stdout);
533	return false;
534	}
535
536	bool draw_board(char board[HEIGHT][WIDTH][STRING_LEN],
537	struct winsize window_size, bool redraw, bool paused) {
538
539	uint8_t i, j;
540
541	uint8_t actual_height = HEIGHT + 2;
542	uint8_t actual_width = WIDTH * 2 + 2;
543
544	if (actual_width > window_size.ws_col \|\| actual_height > window_size.ws_row) {
545
546	printf("\033[2J\033[HToo small\n");
547	printf("Min width: %i & Min height: %i\n", actual_height, actual_width);
548
549	return true;
550	}
551
552	uint8_t vertical_buffer = (window_size.ws_row - actual_height) >> 1;
553	uint8_t horizontal_buffer = (window_size.ws_col - actual_width) >> 1;
554
555	if (redraw) {
556	printf("\033[2J\033[H");
557	for (i = 0; i < vertical_buffer; i++)
558	printf("\n");
559	} else {
560	for (i = 0; i < actual_height - 1; i++)
561	printf("\033[%c", UP_CODE);
562	printf("\r");
563	}
564
565	for (i = 0; i < horizontal_buffer; i++)
566	printf(" ");
567	printf("+");
568	for (i = 0; i < WIDTH; i++)
569	printf("--");
570	printf("+\n");
571
572	for (i = 0; i < HEIGHT; i++) {
573
574	for (j = 0; j < horizontal_buffer; j++)
575	printf(" ");
576
577	printf("\|");
578
579	for (j = 0; j < WIDTH; j++)
580	printf("%s", board[i][j]);
581
582	printf("\|\n");
583	}
584
585	for (i = 0; i < horizontal_buffer; i++)
586	printf(" ");
587	printf("+");
588	for (i = 0; i < WIDTH; i++)
589	printf("--");
590	printf("+");
591
592	if (paused)
593	draw_pause(window_size, actual_width, actual_height);
594
595	fflush(stdout);
596
597	return false;
598	}
599
600	void draw_pause(struct winsize window_size, uint8_t field_width,
601	uint8_t field_height) {
602
603	const uint8_t height = 5;
604	const uint8_t width = 14;
605
606	const char *pause_menu[] = {"+------------+", "\| \|",
607	"\| PAUSED \|", "\| \|",
608	"+------------+"};
609
610	const uint8_t going_up = (field_height + height) >> 1;
611	const uint8_t going_right = (field_width - width) >> 1;
612
613	const uint8_t horizontal_buffer = (window_size.ws_col - field_width) >> 1;
614
615	uint8_t i, j;
616
617	for (i = 0; i < going_up; i++)
618	printf("\033[%c", UP_CODE);
619	printf("\r");
620
621	for (i = 0; i < height; i++) {
622	for (j = 0; j < horizontal_buffer; j++)
623	printf("\033[%c", RIGHT_CODE);
624	for (j = 0; j < going_right; j++)
625	printf("\033[%c", RIGHT_CODE);
626
627	printf("\033[37m%s\033[0m\033[%c\r", pause_menu[i], DOWN_CODE);
628	}
629
630	for (i = 0; i < going_up - height; i++)
631	printf("\033[%c", DOWN_CODE);
632	printf("\r");
633
634	fflush(stdout);
635	}
636
637	direction read_direction(char *string, bool wasd_enabled) {
638
639	if (strlen(string) >= 3) {
640	if (string[0] == '\033') {
641	if (string[1] == '[') {
642
643	switch (string[2]) {
644	case RIGHT_CODE:
645	return RIGHT;
646	break;
647	case LEFT_CODE:
648	return LEFT;
649	break;
650	case UP_CODE:
651	return UP;
652	break;
653	case DOWN_CODE:
654	return DOWN;
655	break;
656	}
657	}
658	}
659	}
660
661	if (wasd_enabled) {
662	switch (toupper(string[0])) {
663	case 'A':
664	return LEFT;
665	break;
666	case 'D':
667	return RIGHT;
668	break;
669	case 'W':
670	return UP;
671	break;
672	case 'S':
673	return DOWN;
674	break;
675	}
676	}
677
678	return NO_DIRECTION;
679	}