X-Git-Url: http://git.tdb.fi/?p=libs%2Fcore.git;a=blobdiff_plain;f=source%2Ffs%2Futils.h;h=e518d35cf225da8e38692e5b09dffe2d21793af5;hp=df7bc76b8d5add12bae4cb3daae6cf4027d3a3a1;hb=8bbba6b8cd02c33612fb173e6df48b130407af8f;hpb=eeb6ed7b20d56578ff8c68f3c94e887d5ac768ee

diff --git a/source/fs/utils.h b/source/fs/utils.h
index df7bc76..e518d35 100644
--- a/source/fs/utils.h
+++ b/source/fs/utils.h
@@ -35,11 +35,15 @@ void unlink(const Path &path);
 /// Renames a file.  Existing file, if any, is overwritten.
 void rename(const Path &from, const Path &to);
 
-/// Makes a path relative to some base path.  That is, base/result==path.
+/** Makes a path relative to some base path.  That is, base/result==path.  Both
+paths must be either absolute or relative. */
 Path relative(const Path &path, const Path &base);
 
+/// Returns the longest prefix shared by both paths.
+Path common_ancestor(const Path &, const Path &);
+
 /** Determines how many levels a path is below another.  Returns -1 if path is
-not a descendant of parent. */
+not a descendant of parent.  Both paths must be either absolute or relative. */
 int descendant_depth(const Path &path, const Path &parent);
 
 } // namespace FS