1 files changed, 48 insertions, 0 deletions
diff --git a/prb_arena.c b/prb_arena.c
new file mode 100644
index 0000000..1938dec
--- /dev/null
+++ b/prb_arena.c
@@ -0,0 +1,48 @@
+Arena *alloc_arena(U64 cap)
+{
+	Arena	*a;
+
+	/* TODO(pryazha): Use OS specific memory allocator
+	 * (like VirtualAlloc on Windows or mmap on Linux)
+	 */
+	a = malloc(sizeof(Arena));
+	ASSERT(a);
+
+	if (!cap)
+		cap = PRB_DEFAULT_ALLOC_SIZE;
+
+	a->mem = malloc(cap);
+	ASSERT(a->mem);
+	a->cap = cap;
+	a->used = 0;
+
+	return a;
+}
+
+void release_arena(Arena *a)
+{
+	free(a->mem);
+	MEM0STRUCT(a);
+	free(a);
+}
+
+void *push_arena(Arena *a, U64 size)
+{
+	ASSERT(a);
+	ASSERT(a->used+size <= a->cap);
+
+	void	*r;
+
+	r = a->mem+a->used;
+	a->used += size;
+
+	return r;
+}
+
+void pop_arena(Arena *a, U64 size)
+{
+	ASSERT(a);
+	U64	clamped;
+	clamped = CLAMPTOP(size, a->used);
+	a->used = a->used-clamped;
+}