From 5f736eada55f84c7499103faf7c181b80eb7092f Mon Sep 17 00:00:00 2001
From: Tavian Barnes <tavianator@tavianator.com>
Date: Thu, 31 Aug 2023 10:16:15 -0400
Subject: alloc: New [v]arena_clear() functions

---
 src/alloc.c | 16 +++++++++++++++-
 src/alloc.h | 10 ++++++++++
 2 files changed, 25 insertions(+), 1 deletion(-)

diff --git a/src/alloc.c b/src/alloc.c
index 56d8763..8a4dc3a 100644
--- a/src/alloc.c
+++ b/src/alloc.c
@@ -163,11 +163,19 @@ void arena_free(struct arena *arena, void *ptr) {
 	sanitize_free(chunk, arena->size);
 }
 
-void arena_destroy(struct arena *arena) {
+void arena_clear(struct arena *arena) {
 	for (size_t i = 0; i < arena->nslabs; ++i) {
 		free(arena->slabs[i]);
 	}
 	free(arena->slabs);
+
+	arena->chunks = NULL;
+	arena->nslabs = 0;
+	arena->slabs = NULL;
+}
+
+void arena_destroy(struct arena *arena) {
+	arena_clear(arena);
 	sanitize_uninit(arena);
 }
 
@@ -280,6 +288,12 @@ void varena_free(struct varena *varena, void *ptr, size_t count) {
 	arena_free(arena, ptr);
 }
 
+void varena_clear(struct varena *varena) {
+	for (size_t i = 0; i < varena->narenas; ++i) {
+		arena_clear(&varena->arenas[i]);
+	}
+}
+
 void varena_destroy(struct varena *varena) {
 	for (size_t i = 0; i < varena->narenas; ++i) {
 		arena_destroy(&varena->arenas[i]);
diff --git a/src/alloc.h b/src/alloc.h
index c2ea09b..b5dfa68 100644
--- a/src/alloc.h
+++ b/src/alloc.h
@@ -185,6 +185,11 @@ void *arena_alloc(struct arena *arena);
  */
 void arena_free(struct arena *arena, void *ptr);
 
+/**
+ * Free all allocations from an arena.
+ */
+void arena_clear(struct arena *arena);
+
 /**
  * Destroy an arena, freeing all allocations.
  */
@@ -277,6 +282,11 @@ void *varena_realloc(struct varena *varena, void *ptr, size_t old_count, size_t
  */
 void varena_free(struct varena *varena, void *ptr, size_t count);
 
+/**
+ * Free all allocations from a varena.
+ */
+void varena_clear(struct varena *varena);
+
 /**
  * Destroy a varena, freeing all allocations.
  */
-- 
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