Add meta-files, board structure, and alloc function

Adds meta-files such as the Makefile and flake.lock/nix for easier
project management.

Adds board structure in connect4.h, as well as some helper functions
such as the make_board function to create a board, and the print_board
function to view the board after creation.

Makefile

@@ -0,0 +1,14 @@
+CC = gcc
+CFLAGS = -g -Wall -pedantic
+
+connect4.c main.c: connect4.h
+
+TARGET = connect4
+CFILES = main.c connect4.c
+OFILES = ${CFILES:.c=.o}
+
+all: ${OFILES}
+	$(CC) $(CFLAGS) -o ${TARGET} ${OFILES}
+
+clean:
+	rm -r ${TARGET} ${OFILES}

connect4.c

@@ -0,0 +1,43 @@
+#include "connect4.h"
+#include <stddef.h>
+#include <stdlib.h>
+#include <stdio.h>
+
+struct Board *make_board(size_t height, size_t width) 
+{
+  struct Board *new_board = malloc(sizeof(*new_board));
+  if (!new_board)
+    return NULL;
+  new_board->tilemap = calloc(height*width, sizeof(*(new_board->tilemap)));
+  if (!new_board->tilemap)
+    goto out_tilemap;
+  new_board->tile_heights = calloc(width, sizeof(*(new_board->tile_heights)));
+  if (!new_board->tile_heights)
+    goto out_tile_heights;
+  
+  new_board->height = height;
+  new_board->width = width;
+  new_board->next_player = RED;
+
+  return new_board;
+
+out_tile_heights:
+  free(new_board->tilemap);
+out_tilemap:
+  free(new_board);
+  return NULL;
+}
+
+int drop_tile(struct Board *board, size_t drop_pos) {
+  return 0;
+}
+
+void print_board(struct Board *board) {
+  for (int j = 0; j < board->height; j++) {
+    for (int i = 0; i < board->width; i++) {
+      printf("%d", IDX(i, j, board));
+    }
+    printf("\n");
+  }
+
+}

connect4.h

@@ -0,0 +1,31 @@
+#ifndef CONNECT4_H_
+#define CONNECT4_H_
+
+#include <stddef.h>
+
+enum Tile {
+  EMPTY = 0,
+  RED,
+  BLACK
+};
+
+struct Board {
+  size_t height;
+  size_t width;
+  size_t *tile_heights;
+  enum Tile *tilemap;
+  enum Tile next_player;
+};
+
+#define IDX(i, j, board) (board->tilemap[j*(board->height) + i])
+
+// Returns a board struct with height and width based on parameters
+struct Board *make_board(size_t height, size_t width);
+
+// Drops a tile, returns 0 if successful, -1 if error, and 1 if the move won
+int drop_tile(struct Board *board, size_t drop_pos);
+
+// Prints the supplied board
+void print_board(struct Board *board);
+
+#endif // !CONNECT4_H_

flake.lock

@@ -0,0 +1,26 @@
+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1720768451,
+        "narHash": "sha256-EYekUHJE2gxeo2pM/zM9Wlqw1Uw2XTJXOSAO79ksc4Y=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "7e7c39ea35c5cdd002cd4588b03a3fb9ece6fad9",
+        "type": "github"
+      },
+      "original": {
+        "id": "nixpkgs",
+        "ref": "nixos-unstable",
+        "type": "indirect"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

@@ -0,0 +1,28 @@
+{
+  description = "C Development";
+
+  inputs = {
+    nixpkgs.url = "nixpkgs/nixos-unstable";
+  };
+
+  outputs = { self, nixpkgs }:
+  let
+    system = "x86_64-linux";
+    pkgs = nixpkgs.legacyPackages.${system};
+    libs = with pkgs; [
+      git
+      gnumake
+      gcc
+      gdb
+      # clang_16
+      # clang-tools_16
+      # lld_16
+      # llvmPackages_16.libllvm
+    ];
+  in {
+    devShells.${system}.default = pkgs.mkShell {
+      buildInputs = libs;
+      LD_LIBRARY_PATH = pkgs.lib.makeLibraryPath libs;
+    };
+  };
+}

main.c

@@ -0,0 +1,10 @@
+#include "connect4.h"
+#include <stdlib.h>
+#include <stdio.h>
+
+int main(int argc, char *argv[])
+{
+  struct Board *my_board = make_board(6, 7);
+  print_board(my_board);
+  return EXIT_SUCCESS;
+}