From b4433f77c88a00d265be8e910a989bf45cee4fbd Mon Sep 17 00:00:00 2001
From: JimMoen <LnJimMoen@outlook.com>
Date: Fri, 8 Oct 2021 11:12:47 +0800
Subject: [PATCH] refactor(mgmt_api): Add `page_start`.

---
 apps/emqx_management/src/emqx_mgmt_api.erl | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/apps/emqx_management/src/emqx_mgmt_api.erl b/apps/emqx_management/src/emqx_mgmt_api.erl
index f7c92aee8..16ff10817 100644
--- a/apps/emqx_management/src/emqx_mgmt_api.erl
+++ b/apps/emqx_management/src/emqx_mgmt_api.erl
@@ -319,8 +319,14 @@ is_fuzzy_key(<<"match_", _/binary>>) ->
 is_fuzzy_key(_) ->
     false.
 
+page_start(Page, Limit) ->
+    if Page > 1 -> (Page-1) * Limit + 1;
+       true -> 1
+    end.
+
 %%--------------------------------------------------------------------
 %% Types
+%%--------------------------------------------------------------------
 
 to_type(V, TargetType) ->
     try