From 6aff340c425a56cb3cf4c3b00b2bd68c48365857 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Tobias=20Nie=C3=9Fen?= <tniessen@tnie.de>
Date: Sun, 23 Jul 2017 21:48:33 +0200
Subject: [PATCH 1/5] path: remove unnecessary string copy

At this line, `path` has a length of 2, so `path.slice(0, 2) === path`.
---
 lib/path.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/path.js b/lib/path.js
index 001152866ffc35..93eda87dcca1d0 100644
--- a/lib/path.js
+++ b/lib/path.js
@@ -1049,7 +1049,7 @@ const win32 = {
           } else {
             // `path` contains just a drive root, exit early to avoid
             // unnecessary work
-            ret.root = ret.dir = path.slice(0, 2);
+            ret.root = ret.dir = path;
             return ret;
           }
         }

From 530f3009b015bd187face642053c266b43afee35 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Tobias=20Nie=C3=9Fen?= <tniessen@tnie.de>
Date: Sun, 23 Jul 2017 21:55:55 +0200
Subject: [PATCH 2/5] path: remove unnecessary string copy

---
 lib/path.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/path.js b/lib/path.js
index 93eda87dcca1d0..c1095733ec2a50 100644
--- a/lib/path.js
+++ b/lib/path.js
@@ -1040,7 +1040,7 @@ const win32 = {
               if (len === 3) {
                 // `path` contains just a drive root, exit early to avoid
                 // unnecessary work
-                ret.root = ret.dir = path.slice(0, 3);
+                ret.root = ret.dir = path;
                 return ret;
               }
               isAbsolute = true;

From 8a07118b61822b636b5d010017a1c22521a72b15 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Tobias=20Nie=C3=9Fen?= <tniessen@tnie.de>
Date: Mon, 24 Jul 2017 11:57:05 +0200
Subject: [PATCH 3/5] More optimizations

---
 lib/path.js | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/lib/path.js b/lib/path.js
index c1095733ec2a50..019843f3eb48fe 100644
--- a/lib/path.js
+++ b/lib/path.js
@@ -788,7 +788,9 @@ const win32 = {
         }
       }
     } else if (code === 47/*/*/ || code === 92/*\*/) {
-      return path[0];
+      // `path` contains just a path separator, exit early to avoid
+      // unnecessary work
+      return path;
     }
 
     for (var i = len - 1; i >= offset; --i) {
@@ -1057,7 +1059,7 @@ const win32 = {
     } else if (code === 47/*/*/ || code === 92/*\*/) {
       // `path` contains just a path separator, exit early to avoid
       // unnecessary work
-      ret.root = ret.dir = path[0];
+      ret.root = ret.dir = path;
       return ret;
     }
 

From 25d96010c62919b12a2101161f5d5dbd28f10a68 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Tobias=20Nie=C3=9Fen?= <tniessen@tnie.de>
Date: Mon, 24 Jul 2017 16:20:30 +0200
Subject: [PATCH 4/5] add tests

---
 test/parallel/test-path-parse-format.js | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/test/parallel/test-path-parse-format.js b/test/parallel/test-path-parse-format.js
index 5d78a6f52643ad..129500998ae137 100644
--- a/test/parallel/test-path-parse-format.js
+++ b/test/parallel/test-path-parse-format.js
@@ -32,6 +32,8 @@ const winPaths = [
   'file',
   '.\\file',
   'C:\\',
+  'C:',
+  '\\',
   '',
 
   // unc

From fdbffaf58e0896b4eac044b197ae80582a80d4c9 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Tobias=20Nie=C3=9Fen?= <tniessen@tnie.de>
Date: Mon, 24 Jul 2017 17:03:20 +0200
Subject: [PATCH 5/5] add more detailed tests

---
 test/parallel/test-path-parse-format.js | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/test/parallel/test-path-parse-format.js b/test/parallel/test-path-parse-format.js
index 129500998ae137..0f70d8ae4e7a23 100644
--- a/test/parallel/test-path-parse-format.js
+++ b/test/parallel/test-path-parse-format.js
@@ -44,7 +44,9 @@ const winPaths = [
 ];
 
 const winSpecialCaseParseTests = [
-  ['/foo/bar', { root: '/' }]
+  ['/foo/bar', { root: '/' }],
+  ['C:', { root: 'C:', dir: 'C:', base: '' }],
+  ['C:\\', { root: 'C:\\', dir: 'C:\\', base: '' }]
 ];
 
 const winSpecialCaseFormatTests = [