From 979de81cc18784dd88516655a20650ce69196096 Mon Sep 17 00:00:00 2001
From: Mosder <git@mosder.eu>
Date: Sat, 12 Sep 2026 20:06:13 +0200
Subject: fix: fixed stale cap in rehash and added an error when
 MOS_HM_LOAD_FACTOR would have an incorrect value

---
 include/moslib/ds/hashmap.h | 3 +++
 src/ds/hashmap.c            | 2 +-
 tests/ds/hashmap_tests.c    | 1 +
 3 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/include/moslib/ds/hashmap.h b/include/moslib/ds/hashmap.h
index ee5de6f..d299b58 100644
--- a/include/moslib/ds/hashmap.h
+++ b/include/moslib/ds/hashmap.h
@@ -129,6 +129,9 @@
 #ifndef MOS_HM_LOAD_FACTOR
 #define MOS_HM_LOAD_FACTOR 75
 #endif // MOS_HM_LOAD_FACTOR
+#if MOS_HM_LOAD_FACTOR < 1 || MOS_HM_LOAD_FACTOR > 100
+#error MOS_HM_LOAD_FACTOR should be an integer value between 1 and 100
+#endif
 
 #ifndef MOS_FORCE_PREFIXES
 
diff --git a/src/ds/hashmap.c b/src/ds/hashmap.c
index 9cdc663..c547af4 100644
--- a/src/ds/hashmap.c
+++ b/src/ds/hashmap.c
@@ -163,7 +163,7 @@ static void rehash(void *p_hm, size_t entry_size, size_t key_size, size_t key_of
         .filled = mos_safe_calloc((new_cap - 1) / 8 + 1, 1),
         .dead = mos_safe_calloc((new_cap - 1) / 8 + 1, 1),
         .size = mos_hm_size(hm),
-        .cap = 2 * hdr->cap,
+        .cap = new_cap,
         .hash = hdr->hash,
         .eq = hdr->eq,
     };
diff --git a/tests/ds/hashmap_tests.c b/tests/ds/hashmap_tests.c
index 844ffb2..b6983fa 100644
--- a/tests/ds/hashmap_tests.c
+++ b/tests/ds/hashmap_tests.c
@@ -1,4 +1,5 @@
 #define _GNU_SOURCE
+#define MOS_HM_LOAD_FACTOR 1
 #include "hashmap_tests.h"
 #include "moslib/ds/hashmap.h"
 
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