Refactoring + memory leak

Connect4.c

 #include "Connect4.h"
 
 #include <stdbool.h>
+#include <stdint.h>
 #include <stdio.h>
 #include <stdlib.h>
 
@@ -52,9 +53,10 @@ void print_grid_separator(int32_t n, char *front, char *rear, char *separator1,
     for (int32_t i = 0; i < n; i += 1) {
         printf("%s", separator1);
 
-        if (i < n - 1)
+        if (i < n - 1) {
             printf("%s", separator2);
         }
+    }
 
     printf("%s", rear);
     printf("\n");
@@ -73,9 +75,10 @@ void print_grid_body(Piece **grid, int32_t rows, int32_t cols, int32_t y) {
     printf("│");
     printf("\n");
 
-    if (y < rows - 1)
+    if (y < rows - 1) {
         print_grid_separator(cols, "├", "┤", "─", "┼");
     }
+}
 
 void print_grid(Piece **grid, int32_t rows, int32_t cols) {
     print_grid_separator(cols, "┌", "┐", "─", "┬");
@@ -100,17 +103,20 @@ void connect4_print(Connect4 *connect4) {
 bool connect4_is_full(Connect4 *connect4) {
     for (int32_t y = 0; y < connect4->rows; y += 1) {
         for (int32_t x = 0; x < connect4->cols; x += 1) {
-            if (connect4->grid[y][x] == PieceNone)
+            if (connect4->grid[y][x] == PieceNone) {
                 return false;
             }
         }
+    }
 
     return true;
 }
 
 int32_t count_contiguous_pieces(Connect4 *connect4, int32_t x, int32_t y, int32_t x_direction, int32_t y_direction, Piece piece) {
-    if (x < 0 || x >= connect4->cols || y < 0 || y >= connect4->rows || connect4->grid[y][x] != piece)
+    if (x < 0 || x >= connect4->cols || y < 0 || y >= connect4->rows || connect4->grid[y][x] != piece) {
         return 0;
+    }
+
     return 1 + count_contiguous_pieces(connect4, x + x_direction, y + y_direction, x_direction, y_direction, piece);
 }
 
@@ -130,10 +136,14 @@ PlacingStatus connect4_place_piece(Connect4 *connect4, Piece piece, int32_t x) {
         if (connect4->grid[y][x] == PieceNone) {
             connect4->grid[y][x] = piece;
 
-            if (connect4_check_win(connect4, x, y, piece))
+            if (connect4_check_win(connect4, x, y, piece)) {
                 return PlacingStatusPlayerWon;
-            if (connect4_is_full(connect4))
+            }
+
+            if (connect4_is_full(connect4)) {
                 return PlacingStatusGridFull;
+            }
+
             return PlacingStatusPiecePlaced;
         }
     }
@@ -142,8 +152,10 @@ PlacingStatus connect4_place_piece(Connect4 *connect4, Piece piece, int32_t x) {
 }
 
 Piece change_player(Piece current_player) {
-    if (current_player == PiecePlayer1)
+    if (current_player == PiecePlayer1) {
         return PiecePlayer2;
+    }
+
     return PiecePlayer1;
 }
 
@@ -165,8 +177,11 @@ PlacingStatus connect4_play_smart(Connect4 *connect4, void (*on_piece_placed)(Co
             Connect4 *copied_connect4 = connect4_copy(connect4);
             PlacingStatus status = connect4_place_piece(copied_connect4, current_player, x);
 
-            if (status == PlacingStatusColumnFull)
+            if (status == PlacingStatusColumnFull) {
+                connect4_destroy(copied_connect4);
                 continue;
+            }
+
             int32_t y = 0;
 
             for (int32_t i = 0; i < copied_connect4->rows; i += 1) {
@@ -191,22 +206,29 @@ PlacingStatus connect4_play_smart(Connect4 *connect4, void (*on_piece_placed)(Co
 }
 
 PlacingStatus connect4_play(Connect4 *connect4, int32_t x, void (*on_piece_placed)(Connect4 *)) {
-    if (x < 1 || x > connect4->cols)
+    if (x < 1 || x > connect4->cols) {
         return PlacingStatusInvalidColumn;
+    }
+
     PlacingStatus status = connect4_place_piece(connect4, connect4->current_player, x - 1);
 
-    if (status != PlacingStatusInvalidColumn || status != PlacingStatusColumnFull)
+    if (status != PlacingStatusInvalidColumn || status != PlacingStatusColumnFull) {
         on_piece_placed(connect4);
-    if (status != PlacingStatusPiecePlaced)
+    }
+
+    if (status != PlacingStatusPiecePlaced) {
         return status;
+    }
+
     connect4->current_player = change_player(connect4->current_player);
 
     if (connect4->mode != 3 && connect4->current_player == PiecePlayer2) {
-        if (connect4->mode == 1)
+        if (connect4->mode == 1) {
             status = connect4_play_random(connect4, on_piece_placed);
-        if (connect4->mode == 2)
+        } else if (connect4->mode == 2) {
             status = connect4_play_smart(connect4, on_piece_placed);
         }
+    }
 
     return status;
 }

Makefile

 CC = gcc
 CCFLAGS = -g -Wall -Wextra -pedantic -fsanitize=address -fsanitize=leak
 
-Connect4.o: Connect4.c
+Connect4.o: Connect4.c Connect4.h
 	$(CC) $(CCFLAGS) -c $< -o $@
 
-random.o: random.c
+random.o: random.c random.h
 	$(CC) $(CCFLAGS) -c $< -o $@
 
-main.o: main.c
+main.o: main.c random.h
 	$(CC) $(CCFLAGS) -c $< -o $@
 
 puissance4: main.o Connect4.o random.o

main.c

-#include <stdbool.h>
 #include <stdint.h>
 #include <stdio.h>
 #include <stdlib.h>
-#include <time.h>
 
 #include "Connect4.h"
 
 char *get_game_result(int32_t mode, Piece current_player, PlacingStatus status) {
-    if (status == PlacingStatusGridFull)
+    if (status == PlacingStatusGridFull) {
         return "It is a draw.";
-    if (current_player == PiecePlayer1)
+    }
+
+    if (current_player == PiecePlayer1) {
         return "Player one won!";
-    else if (current_player == PiecePlayer2 && mode == 3)
+    }
+
+    if (current_player == PiecePlayer2 && mode == 3) {
         return "Player two won!";
+    }
+
     return "Computer won!";
 }
 
@@ -24,18 +28,36 @@ void on_piece_placed(Connect4 *connect4) {
     connect4_print(connect4);
 }
 
+void print_help() {
+    printf("Usage: puissance4 <mode> <row> <col>\n");
+    printf("    mode  specifies the mode: 1 = single player game (random),\n");
+    printf("          2 = single player game (AI), 3 = two players game\n");
+    printf("    row   specifies the number of rows (>= 4)\n");
+    printf("    col   specifies the number of columns (>= 4)\n");
+}
+
 int main(int argc, char *argv[]) {
     srand(0);
 
+    if (argc != 4) {
+        print_help();
+        return EXIT_FAILURE;
+    }
+
     int32_t mode = atoi(argv[1]);
     int32_t rows = atoi(argv[2]);
     int32_t cols = atoi(argv[3]);
 
+    if (mode < 1 || mode > 3 || rows < 4 || cols < 4) {
+        print_help();
+        return EXIT_FAILURE;
+    }
+
     printf("Board size is %dx%d (rows x col)\n", rows, cols);
     Connect4 *connect4 = connect4_create(mode, rows, cols);
     connect4_print(connect4);
-
     PlacingStatus status;
+
     while (true) {
         do {
             printf("Column number? (starts at 1):");
@@ -45,11 +67,13 @@ int main(int argc, char *argv[]) {
             status = connect4_play(connect4, x, on_piece_placed);
         } while (status == PlacingStatusColumnFull || status == PlacingStatusInvalidColumn);
 
-        if (status != PlacingStatusPiecePlaced)
+        if (status != PlacingStatusPiecePlaced) {
             break;
         }
+    }
 
     print_game_result(mode, connect4->current_player, status);
     connect4_destroy(connect4);
+
     return EXIT_SUCCESS;
 }