From 3ef40181f1e9a47b68465bfc34835edcbfe515e0 Mon Sep 17 00:00:00 2001
From: Anton Adamansky <adamansky@gmail.com>
Date: Sun, 12 Nov 2023 00:08:02 +0700
Subject: [PATCH] * Added void iwulist_reset(IWULIST *list) (iwarr.h)

---
 Changelog         | 1 +
 src/utils/iwarr.c | 7 +++++++
 src/utils/iwarr.h | 6 ++++++
 3 files changed, 14 insertions(+)

diff --git a/Changelog b/Changelog
index 09beae9..dc57462 100644
--- a/Changelog
+++ b/Changelog
@@ -1,5 +1,6 @@
 iowow (1.4.17) UNRELEASED; urgency=medium
 
+  * Added void iwulist_reset(IWULIST *list) (iwarr.h)
   * Added experimental jbn_from_js() (iwjson.h)
   * Fixed C++ compilation errors https://github.com/Softmotions/ejdb/issues/381
   * Fixed Correct UCS-16 surrogate pair start code point. #51
diff --git a/src/utils/iwarr.c b/src/utils/iwarr.c
index c51b322..6c3a03f 100644
--- a/src/utils/iwarr.c
+++ b/src/utils/iwarr.c
@@ -215,6 +215,13 @@ iwrc iwulist_clear(IWULIST *list) {
   return 0;
 }
 
+void iwulist_reset(IWULIST *list) {
+  if (list) {
+    list->start = 0;
+    list->num = 0;
+  }
+}
+
 void iwulist_destroy_keep(IWULIST *list) {
   if (list) {
     free(list->array);
diff --git a/src/utils/iwarr.h b/src/utils/iwarr.h
index 855f2bf..a543438 100644
--- a/src/utils/iwarr.h
+++ b/src/utils/iwarr.h
@@ -103,6 +103,12 @@ IW_EXPORT IW_ALLOC IWULIST* iwulist_create(size_t initial_length, size_t unit_si
  */
 IW_EXPORT iwrc iwulist_clear(IWULIST *list);
 
+/**
+ * @brief Resets number of elements to zero.
+ * Underlying list array is not destroyed.
+ */
+IW_EXPORT void iwulist_reset(IWULIST *list);
+
 /**
  * @brief Destroys and deallocates a given unit list.
  *