From e28d223d42ff5e52866f24fbb95d47fea3665070 Mon Sep 17 00:00:00 2001
From: Leonid Yuriev <leo@yuriev.ru>
Date: Wed, 13 May 2020 00:10:58 +0300
Subject: [PATCH] mdbx: fix MDBX_NODUPDATA handling for key-value data.

More for https://github.com/erthink/libmdbx/issues/99
in continue to 9428efd2ae9f7fe984422b5eb1fc47f732236b51

Change-Id: I56050ddf5e56807a11d8613780c3ba76cc16d324
---
 src/core.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/src/core.c b/src/core.c
index c11f8b04..d7e4aaf1 100644
--- a/src/core.c
+++ b/src/core.c
@@ -12023,10 +12023,12 @@ int mdbx_cursor_put(MDBX_cursor *mc, const MDBX_val *key, MDBX_val *data,
       if (exact) {
         if (mc->mc_flags & C_SUB) {
           mdbx_assert(env, data->iov_len == 0 && olddata.iov_len == 0);
-          return rc;
+          return (flags & MDBX_NODUPDATA) ? MDBX_KEYEXIST : MDBX_SUCCESS;
         }
-        if (!(flags & MDBX_RESERVE) && mc->mc_dbx->md_dcmp(data, &olddata) == 0)
-          return rc;
+        if (!(flags & MDBX_RESERVE) &&
+            unlikely(mc->mc_dbx->md_dcmp(data, &olddata) == 0))
+          return ((flags & MDBX_NODUPDATA) && mc->mc_xcursor) ? MDBX_KEYEXIST
+                                                              : MDBX_SUCCESS;
       }
     } else if (unlikely(rc != MDBX_NOTFOUND))
       return rc;