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 timespec mili100 = {0, 1000000 * SPEED};

  /* 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);

    if (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;
        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;
      }
    }
    nanosleep(&mili100, NULL);
  }

  /* 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 */

  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);

    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) {

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