From 7fc9cbe8051eb5574e9f19446ae1c6897c6a89ff Mon Sep 17 00:00:00 2001
From: bert hubert <bert.hubert@netherlabs.nl>
Date: Fri, 19 Feb 2016 21:28:05 +0100
Subject: [PATCH] turns out we were using libc tolower in performance sensitive
 places.. top in perf

---
 pdns/dnsname.cc |  2 +-
 pdns/dnsname.hh | 15 +++++++--------
 2 files changed, 8 insertions(+), 9 deletions(-)

diff --git a/pdns/dnsname.cc b/pdns/dnsname.cc
index c2c9a710f..ddc3998c0 100644
--- a/pdns/dnsname.cc
+++ b/pdns/dnsname.cc
@@ -284,7 +284,7 @@ bool DNSName::operator==(const DNSName& rhs) const
   auto us = d_storage.crbegin();
   auto p = rhs.d_storage.crbegin();
   for(; us != d_storage.crend() && p != rhs.d_storage.crend(); ++us, ++p) {   // why does this go backward? 
-    if(tolower(*p) != tolower(*us))
+    if(dns2_tolower(*p) != dns2_tolower(*us))
       return false;
   }
   return true;
diff --git a/pdns/dnsname.hh b/pdns/dnsname.hh
index 6e7e744ac..7c9326e08 100644
--- a/pdns/dnsname.hh
+++ b/pdns/dnsname.hh
@@ -26,6 +26,12 @@ uint32_t burtleCI(const unsigned char* k, uint32_t lengh, uint32_t init);
    NOTE: For now, everything MUST be . terminated, otherwise it is an error
 */
 
+inline char dns2_tolower(char c)
+{
+  if(c>='A' && c<='Z')
+    c+='a'-'A';
+  return c;
+}
 
 class DNSName
 {
@@ -83,7 +89,7 @@ public:
     return std::lexicographical_compare(d_storage.rbegin(), d_storage.rend(), 
 				 rhs.d_storage.rbegin(), rhs.d_storage.rend(),
 				 [](const char& a, const char& b) {
-					  return tolower(a) < tolower(b); 
+					  return dns2_tolower(a) < dns2_tolower(b); 
 					}); // note that this is case insensitive, including on the label lengths
   }
 
@@ -102,13 +108,6 @@ private:
 
 size_t hash_value(DNSName const& d);
 
-inline char dns2_tolower(char c)
-{
-  if(c>='A' && c<='Z')
-    c+='a'-'A';
-  return c;
-}
-
 
 inline bool DNSName::canonCompare(const DNSName& rhs) const
 {
-- 
2.49.0