From c70bbca209621d62af265023ca6b0d3a6477b001 Mon Sep 17 00:00:00 2001
From: Ghostie <ghostie@ghostpacket.org>
Date: Sat, 8 Feb 2025 18:04:26 -0500
Subject: [PATCH] started to work in memory

---
 Makefile        |  6 +++++-
 include/chip8.h |  2 ++
 include/mem.h   | 14 ++++++++++++++
 src/main.c      |  4 ++++
 src/mem.c       | 23 +++++++++++++++++++++++
 5 files changed, 48 insertions(+), 1 deletion(-)
 create mode 100644 include/mem.h
 create mode 100644 src/mem.c

diff --git a/Makefile b/Makefile
index dcf7bfb..fb72f74 100644
--- a/Makefile
+++ b/Makefile
@@ -3,7 +3,7 @@ ECHO=echo -e
 CFLAGS=-Wall -Werror -std=gnu99 -O0 -g -Iinclude
 LIBS=-lSDL2
 
-FILES=build/main.o
+FILES=build/main.o build/mem.o
 OUT=bin/chip8.out
 
 all: $(FILES)
@@ -14,6 +14,10 @@ build/main.o: src/main.c
 	@$(ECHO) "CC\t\t"$<
 	@$(CC) $(CFLAGS) $< -c -o $@ $(LIBS)
 
+build/mem.o: src/mem.c
+	@$(ECHO) "CC\t\t"$<
+	@$(CC) $(CFLAGS) $< -c -o $@ $(LIBS)
+
 run: all
 	@$(ECHO) "Runing the Chip8 compiler"
 	@$(OUT)
diff --git a/include/chip8.h b/include/chip8.h
index ed504fe..b214a05 100644
--- a/include/chip8.h
+++ b/include/chip8.h
@@ -2,9 +2,11 @@
 #define __CHIP8_H
 
 #include "config.h"
+#include "mem.h"
 
 struct chip8
 {
+	struct chip8_memory memory;
 };
 
 #endif
diff --git a/include/mem.h b/include/mem.h
new file mode 100644
index 0000000..1475913
--- /dev/null
+++ b/include/mem.h
@@ -0,0 +1,14 @@
+#ifndef __MEM_H
+#define __MEM_H
+
+#include "config.h"
+
+struct chip8_memory
+{
+	unsigned char memory[CHIP8_MEMORY_SIZE];
+};
+
+void chip8_memory_set (struct chip8_memory *mem, int index, unsigned char val);
+unsigned char chip8_memory_get (struct chip8_memory *mem, int index);
+
+#endif
diff --git a/src/main.c b/src/main.c
index f2c6603..a667faf 100644
--- a/src/main.c
+++ b/src/main.c
@@ -5,6 +5,10 @@
 int
 main (int argc, char **argv)
 {
+	struct chip8 chip8 = { 0 };
+	chip8_memory_set (&chip8.memory, 50, 'Z');
+	printf ("%c\n", chip8_memory_get (&chip8.memory, 50));
+
 	SDL_Init (SDL_INIT_EVERYTHING);
 	SDL_Window *window = SDL_CreateWindow (
 			EMULATOR_WINDOW_TITLE, SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED,
diff --git a/src/mem.c b/src/mem.c
new file mode 100644
index 0000000..3d4a30d
--- /dev/null
+++ b/src/mem.c
@@ -0,0 +1,23 @@
+#include "mem.h"
+
+#include <assert.h>
+
+static void
+chip8_is_mem_in_bounds (int index)
+{
+	assert (index >= 0 && index < CHIP8_MEMORY_SIZE);
+}
+
+void
+chip8_memory_set (struct chip8_memory *mem, int index, unsigned char val)
+{
+	chip8_is_mem_in_bounds (index);
+	mem->memory[index] = val;
+}
+
+unsigned char
+chip8_memory_get (struct chip8_memory *mem, int index)
+{
+	chip8_is_mem_in_bounds (index);
+	return mem->memory[index];
+}