refactor: clean up

1 files changed, 180 insertions, 165 deletions

diff --git a/mazerator.c b/mazerator.c
index f15c4ae..8ebc7d3 100644
--- a/mazerator.c
+++ b/mazerator.c
@@ -6,38 +6,27 @@
 #include <string.h>
 #include <unistd.h>
 
-// Error handling
-void err(int id)
+/**
+ * Returns a position in the maze from coordinates y and x.
+ *
+ * This is achieved by concatenating the binary values of the two variables.
+ *
+ * For example:
+ *
+ * Y: 8 (0b00001000)
+ * X: 15 (0b00001111)
+ *
+ * Will become:
+ * 0b0000100000001111
+ */
+int get_maze_pos(int posY, int posX)
 {
-	switch (id)
-	{
-	case 0:
-		printf("Error: Stack overflow\nBe kind and report this problem.");
-		break;
-	case 1:
-		printf("Error: Stack underflow\nBe kind and report this problem.");
-		break;
-	}
-	exit(1);
+	return ((posY) << 8) | posX;
 }
 
-// Get a position in the maze from coordinates y and x
-//
-// This is achieved by concatenating the binary values of the two variables.
-//
-// For example:
-// Y: 8	   00001000
-// X: 15   00001111
-// Will become:
-// 0000100000001111
-int get_maze_pos(int posY, int posX) { return ((posY) << 8) | posX; }
-
-// Get y and x coordinates from a position in the maze
-//
-// This is achived by using bitwise operations
-//
-// >> is the bitwise right shift operator and will shift bits to the right
-// & is the bitwise and operator and is used to get only specific bits
+/**
+ * Returns y and x coordinates from a position in the maze.
+ */
 int get_maze_coords(int pos, int *y, int *x)
 {
 	*y = pos >> 8;
@@ -45,8 +34,9 @@ int get_maze_coords(int pos, int *y, int *x)
 	return 1;
 }
 
-// Find out if a string is a number by running it through
-// isdigit() char-by-char
+/**
+ * Returns whether or not a string is a number.
+ */
 int is_number(char *str)
 {
 	size_t len = strlen(str);
@@ -58,21 +48,138 @@ int is_number(char *str)
 	return 1;
 }
 
+/**
+ * Returns a maze filled with walls.
+ *
+ * Arguments:
+ * - height: The height of the new maze
+ * - width: The width of the new maze
+ * - wall: The wall to fill the new maze with
+ */
+char ***create_maze(int height, int width, char *wall)
+{
+	char ***maze;
+
+	// Fill the maze with walls
+	maze = malloc(height * sizeof(char **));
+	for (int y = 0; y < height; y++)
+	{
+		maze[y] = malloc(width * sizeof(char *));
+
+		for (int x = 0; x < width; x++)
+		{
+			maze[y][x] = wall;
+		}
+	}
+
+	return maze;
+}
+
+/**
+ * Excavates a maze.
+ *
+ * This is what creates the actual maze.
+ *
+ * Arguments:
+ * - maze: The maze to excavate
+ * - maze_height: The height of the maze
+ * - maze_width: The width of the maze
+ */
+void excavate_maze(char ***maze, int maze_height, int maze_width)
+{
+	struct stack *path = create_stack(maze_width * maze_height);
+
+	stack_push(path, 0);
+
+	int visited_pos_cnt = 0;
+	while (1)
+	{
+		int pos = stack_peek(path);
+		int posY, posX;
+		get_maze_coords(pos, &posY, &posX);
+
+		// Set the currently visited grid square to 1 indicating that it has been
+		// visited and excavate the visual maze
+		maze[posY * 2 + 1][posX * 2 + 1] = " ";
+
+		// Find out available next positions to go to
+		int neighbours[3];
+		int neighbour_cnt = 0;
+
+		if (posY != 0 && strcmp(maze[posY * 2 - 1][posX * 2 + 1], " ") != 0)
+		{
+			neighbours[neighbour_cnt] = get_maze_pos(posY - 1, posX);
+			neighbour_cnt++;
+		}
+		if (posY != maze_height - 1 && strcmp(maze[(posY + 1) * 2 + 1][posX * 2 + 1], " ") != 0)
+		{
+			neighbours[neighbour_cnt] = get_maze_pos(posY + 1, posX);
+			neighbour_cnt++;
+		}
+		if (posX != 0 && strcmp(maze[posY * 2 + 1][posX * 2 - 1], " ") != 0)
+		{
+			neighbours[neighbour_cnt] = get_maze_pos(posY, posX - 1);
+			neighbour_cnt++;
+		}
+		if (posX != maze_width - 1 && strcmp(maze[posY * 2 + 1][(posX + 1) * 2 + 1], " ") != 0)
+		{
+			neighbours[neighbour_cnt] = get_maze_pos(posY, posX + 1);
+			neighbour_cnt++;
+		}
+
+		if (neighbour_cnt == 0)
+		{
+			if (visited_pos_cnt == (maze_height * maze_width) - 1)
+			{
+				// The whole maze have been visited
+				break;
+			}
+
+			// Go back a step
+			stack_pop(path);
+			continue;
+		}
+
+		visited_pos_cnt++;
+
+		int next_pos = neighbours[rand() % neighbour_cnt];
+
+		int next_pos_y, next_pos_x;
+		get_maze_coords(next_pos, &next_pos_y, &next_pos_x);
+
+		maze[posY * 2 - (posY - next_pos_y) + 1]
+			[posX * 2 - (posX - next_pos_x) + 1] = " ";
+
+		stack_push(path, next_pos);
+	}
+}
+
+void print_maze(char ***maze, int height, int width)
+{
+	for (int y = 0; y < height; y++)
+	{
+		for (int x = 0; x < width; x++)
+		{
+			printf("%s", maze[y][x]);
+		}
+		printf("\n");
+	}
+}
+
+const struct option options[] = {
+	{"width", required_argument, NULL, 'w'},
+	{"heigth", required_argument, NULL, 'h'},
+	{"wall", required_argument, NULL, 'W'},
+	{"seed", required_argument, NULL, 's'},
+	{"help", no_argument, NULL, 0},
+	{NULL, 0, NULL, 0}};
+
 int main(int argc, char *argv[])
 {
 	int maze_width = 40;
-	int maze_heigth = 20;
+	int maze_height = 20;
 	char *wall = "█";
-	int seed = 0;
-
-	static struct option options[] = {
-		/*   NAME	ARGUMENT		FLAG	SHORTNAME */
-		{"width", required_argument, NULL, 'w'},
-		{"heigth", required_argument, NULL, 'h'},
-		{"wall", required_argument, NULL, 'W'},
-		{"seed", required_argument, NULL, 's'},
-		{"help", no_argument, NULL, 0},
-		{NULL, 0, NULL, 0}};
+	int seed = -1;
 
 	int c;
 	while ((c = getopt_long(argc, argv, "w:h:W:s:", options, NULL)) != -1)
@@ -80,159 +187,67 @@ int main(int argc, char *argv[])
 		switch (c)
 		{
 		case 'w':
+			if (!is_number(optarg) || atoi(optarg) < 1 || atoi(optarg) > 255)
+			{
+				printf("Invalid option argument for -%c!\n", c);
+				exit(1);
+			}
+
+			maze_width = atoi(optarg);
+			break;
 		case 'h':
-			// Set heigth or width
-			if (is_number(optarg) && atoi(optarg) >= 1 && atoi(optarg) <= 255)
-				switch (c)
-				{
-				case 'h':
-					maze_heigth = atoi(optarg);
-				case 'w':
-					maze_width = atoi(optarg);
-				}
-			else
+			if (!is_number(optarg) || atoi(optarg) < 1 || atoi(optarg) > 255)
 			{
 				printf("Invalid option argument for -%c!\n", c);
 				exit(1);
 			}
+
+			maze_height = atoi(optarg);
 			break;
 		case 'W':
-			// Set the wall
 			wall = optarg;
 			break;
 		case 's':
-			// Set the seed
-			if (is_number(optarg))
-			{
-				seed = atoi(optarg);
-				break;
-			}
-			else
+			if (!is_number(optarg))
 			{
 				printf("Invalid option argument for -s/--seed!\n");
 				exit(1);
 			}
+
+			seed = atoi(optarg);
+			break;
 		case 0:
-			// Help
 			printf(
-				"Usage: mazerator [--help] [-W wall] [-s seed] [-w width] [-h heigth]\n\n\
-OPTIONS\n\
-    --width        -w     The width of the maze. (1-255). Default: 40\n\
-    --heigth       -h     The heigth of the maze. (1-255). Default: 20\n\
-    --wall         -W     Single character used as maze walls. Default: '█'\n\
-    --seed         -s     The randomization seed used for maze generation. (Any number). Default is to read /dev/urandom\n\
-    --help                Displays usage information\n\
-");
+				"Usage: %s [OPTION]...\n\n"
+				"Options:\n"
+				"  -w, --width WIDTH       The width of the maze. (1-255) (Default: 40)\n"
+				"  -h, --heigth HEIGHT     The heigth of the maze. (1-255) (Default: 20)\n"
+				"  -w, --wall WALL         Single character used as maze walls (Default: '█')\n"
+				"  -s, --seed SEED         The randomization seed used for maze generation. (Any number)\n"
+				"  --help                  Displays usage information\n",
+				argv[0]);
 			exit(0);
 		case '?':
-			printf("\nTry 'mazerator --help' for more information\n");
+			printf("\nTry '%s --help' for more information\n", argv[0]);
 			exit(1);
 		}
 	}
 
-	int maze[maze_heigth][maze_width];
-	char *maze_visual[maze_heigth * 2 + 1][maze_width * 2 + 1];
-	struct stack *path = new_stack(maze_width * maze_heigth);
-
-	// Prepares seed value for randr()
-	// Get's a seed from /dev/urandom if not already set
-	if (seed == 0)
+	if (seed == -1)
 	{
-		printf("What");
 		FILE *f = fopen("/dev/urandom", "r");
 		fread(&seed, sizeof(seed), 1, f);
 		fclose(f);
 	}
-	srand(seed);
 
-	// Prepares the maze grids
-	// Fills the maze with zeroes indicating that none of the grid squares have
-	// been visited
-	//
-	// Fills the visual maze with walls
-	for (int y = 0; y < sizeof(maze) / sizeof(maze[0]); y++)
-	{
-		for (int x = 0; x < sizeof(maze[0]) / sizeof(maze[0][0]); x++)
-		{
-			maze[y][x] = 0;
-		}
-	}
-	for (int y = 0; y < sizeof(maze_visual) / sizeof(maze_visual[0]); y++)
-	{
-		for (int x = 0; x < sizeof(maze_visual[0]) / sizeof(maze_visual[0][0]);
-			 x++)
-		{
-			maze_visual[y][x] = wall;
-		}
-	}
+	srand(seed);
 
-	// Set the start value (0, 0) and begin the algoritm loop
-	stack_push(path, 0);
-	int cnt = 0;
-	while (1)
-	{
-		int pos = stack_peek(path);
-		int posY, posX;
-		get_maze_coords(pos, &posY, &posX);
+	int full_maze_height = maze_height * 2 + 1;
+	int full_maze_width = maze_width * 2 + 1;
 
-		// Set the currently visited grid square to 1 indicating that it has been
-		// visited and excavate the visual maze
-		maze[posY][posX] = 1;
-		maze_visual[posY * 2 + 1][posX * 2 + 1] = " ";
+	char ***maze = create_maze(full_maze_height, full_maze_width, wall);
 
-		// Find out available next positions to go to
-		int neighbours[3];
-		int i = 0;
-		if (posY != 0 && maze[posY - 1][posX] == 0)
-		{
-			neighbours[i] = get_maze_pos(posY - 1, posX);
-			i++;
-		}
-		if (posY != maze_heigth - 1 && maze[posY + 1][posX] == 0)
-		{
-			neighbours[i] = get_maze_pos(posY + 1, posX);
-			i++;
-		}
-		if (posX != 0 && maze[posY][posX - 1] == 0)
-		{
-			neighbours[i] = get_maze_pos(posY, posX - 1);
-			i++;
-		}
-		if (posX != maze_width - 1 && maze[posY][posX + 1] == 0)
-		{
-			neighbours[i] = get_maze_pos(posY, posX + 1);
-			i++;
-		}
+	excavate_maze(maze, maze_height, maze_width);
 
-		switch (i)
-		{
-		case 0:
-			// No available next positions
-			if (cnt == (maze_heigth * maze_width) - 1)
-			{
-				for (int y = 0; y < sizeof(maze_visual) / sizeof(maze_visual[0]); y++)
-				{
-					for (int x = 0;
-						 x < sizeof(maze_visual[0]) / sizeof(maze_visual[0][0]); x++)
-					{
-						printf("%s", maze_visual[y][x]);
-					}
-					printf("\n");
-				}
-				exit(0);
-			}
-			stack_pop(path);
-			break;
-		default:
-			// Available next positions
-			// Choose a random one and go there
-			cnt++;
-			int next = neighbours[rand() % i];
-			int next_y, next_x;
-			get_maze_coords(next, &next_y, &next_x);
-			maze_visual[posY * 2 - (posY - next_y) + 1]
-					   [posX * 2 - (posX - next_x) + 1] = " ";
-			stack_push(path, next);
-		}
-	}
+	print_maze(maze, full_maze_height, full_maze_width);
 }