From dbb2e02721b6250a434a807d92126c7716c40a15 Mon Sep 17 00:00:00 2001
From: Mikko Rasa <tdb@tdb.fi>
Date: Tue, 27 Dec 2022 17:32:24 +0200
Subject: [PATCH] Fix an issue with normalizing paths of the form /foo/..

The separator indicating the root directory was being incorrectly
removed, resulting in a path denoting the current directory.
---
 source/fs/path.cpp | 14 ++++++++++++--
 tests/path.cpp     |  2 ++
 2 files changed, 14 insertions(+), 2 deletions(-)

diff --git a/source/fs/path.cpp b/source/fs/path.cpp
index 0e86600..1181b92 100644
--- a/source/fs/path.cpp
+++ b/source/fs/path.cpp
@@ -133,11 +133,21 @@ void Path::add_component(const string &comp)
 				path += DIRSEP;
 				path += comp;
 			}
-			else if(separators.empty())
+			else if(start==0)
+			{
+				/* Removing the last component of a relative path results in the
+				current directory */
 				path = ".";
+			}
+			else if(start==1)
+			{
+				/* Removing the last component of an absolute path results in the
+				root directory */
+				path.erase(start, string::npos);
+			}
 			else
 			{
-				// Otherwise, erase the last component
+				// Otherwise, erase the last component and its separator
 				path.erase(separators.back(), string::npos);
 				separators.pop_back();
 			}
diff --git a/tests/path.cpp b/tests/path.cpp
index fbb5ff5..d52630a 100644
--- a/tests/path.cpp
+++ b/tests/path.cpp
@@ -52,6 +52,8 @@ void PathTests::normalization()
 	EXPECT_EQUAL(path.str(), "./foo");
 	path = "foo/..";
 	EXPECT_EQUAL(path.str(), ".");
+	path = "/foo/..";
+	EXPECT_EQUAL(path.str(), "/");
 	path = "//foo";
 	EXPECT_EQUAL(path.str(), "/foo");
 	path = "/..";
-- 
2.45.2