create logical device

3 files changed, 18 insertions, 4 deletions

diff --git a/src/std/buf.h b/src/std/buf.h
index b0f8b85..de093ec 100644
--- a/src/std/buf.h
+++ b/src/std/buf.h
@@ -1,12 +1,12 @@
 /**
  * @file buf.h
  * @author your name (you@domain.com)
- * @brief 
+ * @brief
  * @version 0.1
  * @date 2024-04-28
- * 
+ *
  * @copyright Copyright (c) 2024
- * 
+ *
  */
 #pragma once
 #include "defines.h"
diff --git a/src/std/mem.c b/src/std/mem.c
index 5468898..4886d72 100644
--- a/src/std/mem.c
+++ b/src/std/mem.c
@@ -31,4 +31,11 @@ void arena_free_all(arena* a) {
   a->curr = a->begin;  // pop everything at once and reset to the start.
 }
 
-void arena_free_storage(arena* a) { free(a->begin); }
\ No newline at end of file
+void arena_free_storage(arena* a) { free(a->begin); }
+
+arena_save arena_savepoint(arena* a) {
+  arena_save savept = { .arena = a, .savepoint = a->curr };
+  return savept;
+}
+
+void arena_rewind(arena_save savepoint) { savepoint.arena->curr = savepoint.savepoint; }
\ No newline at end of file
diff --git a/src/std/mem.h b/src/std/mem.h
index 2f92894..bbfb852 100644
--- a/src/std/mem.h
+++ b/src/std/mem.h
@@ -18,9 +18,16 @@ typedef struct arena {
   char* end;
 } arena;
 
+typedef struct arena_save {
+  arena* arena;
+  char* savepoint;
+} arena_save;
+
 arena arena_create(void* backing_buffer, size_t capacity);
 void* arena_alloc(arena* a, size_t size);
 void* arena_alloc_align(arena* a, size_t size, size_t align);
 void arena_free_all(arena* a);
 void arena_free_storage(arena* a);
+arena_save arena_savepoint(arena* a);
+void arena_rewind(arena_save savepoint);
 // TODO: arena_resize
\ No newline at end of file