From 1fc8bb7142868bbeac5bcbbd489cd23347716203 Mon Sep 17 00:00:00 2001
From: 3gg <3gg@shellblade.net>
Date: Mon, 30 Jun 2025 19:29:07 -0700
Subject: Fix: set num used blocks to 0 on clear

---
 mem/src/mem.c               | 1 +
 mem/test/mem_test.c         | 2 ++
 mempool/src/mempool.c       | 5 +++--
 mempool/test/mempool_test.c | 8 +++++---
 4 files changed, 11 insertions(+), 5 deletions(-)

diff --git a/mem/src/mem.c b/mem/src/mem.c
index c2af518..9169a9f 100644
--- a/mem/src/mem.c
+++ b/mem/src/mem.c
@@ -57,6 +57,7 @@ void mem_del_(Memory* mem) {
 
 void mem_clear_(Memory* mem) {
   assert(mem);
+  mem->num_used_blocks = 0;
   mem->next_free_chunk = 0;
   memset(mem->blocks, 0, mem->num_blocks * mem->block_size_bytes);
   memset(mem->chunks, 0, mem->num_blocks * sizeof(Chunk));
diff --git a/mem/test/mem_test.c b/mem/test/mem_test.c
index 14718a5..88c8b14 100644
--- a/mem/test/mem_test.c
+++ b/mem/test/mem_test.c
@@ -220,6 +220,8 @@ TEST_CASE(mem_clear_then_reuse) {
   }
 
   mem_clear(&mem);
+  TEST_EQUAL(mem_size(&mem), 0);
+  TEST_EQUAL(mem_capacity(&mem), NUM_BLOCKS);
 
   // Allocate chunks and assign values 0..N.
   for (int i = 0; i < NUM_BLOCKS; ++i) {
diff --git a/mempool/src/mempool.c b/mempool/src/mempool.c
index 444d602..c398c4f 100644
--- a/mempool/src/mempool.c
+++ b/mempool/src/mempool.c
@@ -66,8 +66,9 @@ void mempool_del_(mempool* pool) {
 
 void mempool_clear_(mempool* pool) {
   assert(pool);
-  pool->head = 0;
-  pool->used = 0;
+  pool->head            = 0;
+  pool->used            = 0;
+  pool->num_used_blocks = 0;
   memset(pool->blocks, 0, pool->num_blocks * pool->block_size_bytes);
   memset(pool->block_info, 0, pool->num_blocks * sizeof(BlockInfo));
   init_free_list(pool);
diff --git a/mempool/test/mempool_test.c b/mempool/test/mempool_test.c
index 843f7e7..4c55e4b 100644
--- a/mempool/test/mempool_test.c
+++ b/mempool/test/mempool_test.c
@@ -178,16 +178,18 @@ TEST_CASE(mem_clear_then_reuse) {
 
   // Allocate chunks, contents not important.
   for (int i = 0; i < NUM_BLOCKS; ++i) {
-    int* chunk = mempool_alloc(&mem);
-    TEST_TRUE(chunk != 0);
+    const int* chunk = mempool_alloc(&mem);
+    TEST_TRUE(chunk != nullptr);
   }
 
   mempool_clear(&mem);
+  TEST_EQUAL(mempool_size(&mem), 0);
+  TEST_EQUAL(mempool_capacity(&mem), NUM_BLOCKS);
 
   // Allocate chunks and assign values 0..N.
   for (int i = 0; i < NUM_BLOCKS; ++i) {
     int* chunk = mempool_alloc(&mem);
-    TEST_TRUE(chunk != 0);
+    TEST_TRUE(chunk != nullptr);
     *chunk = i + 1;
   }
 
-- 
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