From db50fb8726482806c3c25313babd68a18a1133c5 Mon Sep 17 00:00:00 2001
From: Leo Yuriev <leo@yuriev.ru>
Date: Thu, 21 Jun 2018 17:26:29 +0300
Subject: [PATCH] mdbx: backport - fix Coverity warning (minor, paranoia).

Change-Id: I232377a03244dc33beb4f332c0024b454027f659
---
 src/mdbx.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/src/mdbx.c b/src/mdbx.c
index c6c8a41b..480b9a38 100644
--- a/src/mdbx.c
+++ b/src/mdbx.c
@@ -1134,7 +1134,7 @@ const char *__cold mdbx_strerror(int errnum) {
   const char *msg = __mdbx_strerr(errnum);
   if (!msg) {
 #ifdef _MSC_VER
-    static __thread char buffer[1024];
+    static char buffer[1024];
     size_t size = FormatMessageA(
         FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS, NULL,
         errnum, MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), buffer,
@@ -1142,6 +1142,13 @@ const char *__cold mdbx_strerror(int errnum) {
     if (size)
       msg = buffer;
 #else
+    if (errnum < 0) {
+      static char buffer[32];
+      int rc = snprintf(buffer, sizeof(buffer) - 1, "unknown error %d", errnum);
+      assert(rc > 0);
+      (void)rc;
+      return buffer;
+    }
     msg = strerror(errnum);
 #endif
   }