From 4b9494f8e8afc4a46a1780cb88090888b9b0b874 Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Wed, 4 Sep 2019 15:47:08 +0200
Subject: Minor improvement to path_traits::find_extension()

---
 libbutl/path.mxx | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/libbutl/path.mxx b/libbutl/path.mxx
index 685e15a..ca034c9 100644
--- a/libbutl/path.mxx
+++ b/libbutl/path.mxx
@@ -317,9 +317,12 @@ LIBBUTL_MODEXPORT namespace butl
     // Return the position of '.' or npos if there is no extension.
     //
     static size_type
-    find_extension (string_type const& s)
+    find_extension (string_type const& s, size_type n = string_type::npos)
     {
-      const C* r (find_extension (s.c_str (), s.size ()));
+      if (n == string_type::npos)
+        n = s.size ();
+
+      const C* r (find_extension (s.c_str (), n));
       return r != nullptr ? r - s.c_str () : string_type::npos;
     }
 
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