From 0b27ac2f5c6a352be733f00e873ceb9d0904e92a Mon Sep 17 00:00:00 2001
From: Max Kellermann <max@duempel.org>
Date: Mon, 14 Oct 2013 22:09:02 +0200
Subject: fs/Path: add method RelativeFS()

Move code from map_fs_to_utf8().
---
 src/fs/Path.cxx | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

(limited to 'src/fs/Path.cxx')

diff --git a/src/fs/Path.cxx b/src/fs/Path.cxx
index 09616c9f4..1a1f133d0 100644
--- a/src/fs/Path.cxx
+++ b/src/fs/Path.cxx
@@ -184,3 +184,25 @@ void Path::GlobalInit()
 		SetFSCharset("ISO-8859-1");
 	}
 }
+
+const char *
+Path::RelativeFS(const char *other_fs) const
+{
+	const size_t l = length();
+	if (memcmp(data(), other_fs, l) != 0)
+		return nullptr;
+
+	other_fs += l;
+	if (*other_fs != 0) {
+		if (!G_IS_DIR_SEPARATOR(*other_fs))
+			/* mismatch */
+			return nullptr;
+
+		/* skip remaining path separators */
+		do {
+			++other_fs;
+		} while (G_IS_DIR_SEPARATOR(*other_fs));
+	}
+
+	return other_fs;
+}
-- 
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