fs/Path: add GetSuffix()

src/fs/AllocatedPath.hxx

@@ -295,6 +295,15 @@ public:
 		return Traits::Relative(c_str(), other_fs.c_str());
 	}
 
+	/**
+	 * Returns the filename suffix (including the dot) or nullptr
+	 * if the path does not have one.
+	 */
+	[[gnu::pure]]
+	const_pointer GetSuffix() const noexcept {
+		return Path{*this}.GetSuffix();
+	}
+
 	/**
 	 * Returns the filename extension (excluding the dot) or
 	 * nullptr if the path does not have one.

src/fs/Path.cxx

@@ -37,7 +37,7 @@ Path::ToUTF8Throw() const
 }
 
 Path::const_pointer
-Path::GetExtension() const noexcept
+Path::GetSuffix() const noexcept
 {
 	const auto *base = GetBase().c_str();
 
@@ -46,9 +46,16 @@ Path::GetExtension() const noexcept
 	while (*base == '.')
 		++base;
 
-	const auto *dot = StringFindLast(base, '.');
-	if (dot == nullptr)
-		return nullptr;
-
-	return dot + 1;
+	return StringFindLast(base, '.');
+}
+
+Path::const_pointer
+Path::GetExtension() const noexcept
+{
+	const auto *result = GetSuffix();
+	if (result != nullptr)
+		/* skip the dot */
+		++result;
+
+	return result;
 }

src/fs/Path.hxx

@@ -166,6 +166,13 @@ public:
 		return Traits::IsAbsolute(c_str());
 	}
 
+	/**
+	 * Returns the filename suffix (including the dot) or nullptr
+	 * if the path does not have one.
+	 */
+	[[gnu::pure]]
+	const_pointer GetSuffix() const noexcept;
+
 	/**
 	 * Returns the filename extension (excluding the dot) or
 	 * nullptr if the path does not have one.