From 8329f5b6a191cf0ceaec9e13ceeac92d7f0b6370 Mon Sep 17 00:00:00 2001
From: Leonid Yuriev <leo@yuriev.ru>
Date: Tue, 27 Aug 2019 14:50:19 +0300
Subject: [PATCH] mdbx-load: fix backslash escaping (for compatibility with
 ITS#9068).

In fact MDBX not affected by this bug, since a very long time mdbx_dump was fixed to not produce a problematic sequence of backslash.

For compatibility with LMDB after http://www.openldap.org/devel/gitweb.cgi?p=openldap.git;a=commit;h=5c012bbe033f9bbb273078b07dded59f080d348d

Change-Id: I8ff8e003ae29504605402b937becd4fb37120408
---
 src/tools/mdbx_load.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/src/tools/mdbx_load.c b/src/tools/mdbx_load.c
index 9c679acb..7bbc52b8 100644
--- a/src/tools/mdbx_load.c
+++ b/src/tools/mdbx_load.c
@@ -266,10 +266,9 @@ static int readline(MDBX_val *out, MDBX_val *buf) {
 
   if (mode & PRINT) {
     while (c2 < end) {
-      if (*c2 == '\\') {
+      if (unlikely(*c2 == '\\')) {
         if (c2[1] == '\\') {
-          c1++;
-          c2 += 2;
+          *c1++ = '\\';
         } else {
           if (c2 + 3 > end || !isxdigit(c2[1]) || !isxdigit(c2[2])) {
             Eof = 1;
@@ -277,8 +276,8 @@ static int readline(MDBX_val *out, MDBX_val *buf) {
             return EOF;
           }
           *c1++ = (char)unhex(++c2);
-          c2 += 2;
         }
+        c2 += 2;
       } else {
         /* copies are redundant when no escapes were used */
         *c1++ = *c2++;