feat: bounds check, refactor

src/jalloc.c

@@ -2,13 +2,21 @@
 #include <stdio.h>
 #include <stdint.h>
 
-#define HEAP_SIZE (1024 * 1024)
+#define HEAP_SIZE (1024 * 1024 * 2)
+#define ALIGNMENT 8
 
 static uint8_t heap[HEAP_SIZE];
-static size_t heap_offset = 0;
+static uint8_t *heap_ptr = heap;
 
-void* jalloc(size_t size) {
-    void* ptr = &heap[heap_offset];
-    heap_offset += size;
+/**
+ * Allocate memory via bump allocation
+ */
+void *jalloc(size_t size) {
+    if (heap_ptr + size > heap + sizeof(heap)) return NULL;
+
+    void *ptr = heap_ptr;
+    heap_ptr += size;
     return ptr;
 }
+
+void jfree(void *ptr) {}