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diff --git a/src/util/WStringCompare.hxx b/src/util/WStringCompare.hxx
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+/*
+ * Copyright (C) 2013-2015 Max Kellermann <max@duempel.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the
+ * distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
+ * FOUNDATION OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef WSTRING_COMPARE_HXX
+#define WSTRING_COMPARE_HXX
+
+#include "Compiler.h"
+
+#include <wchar.h>
+
+gcc_pure
+bool
+StringStartsWith(const wchar_t *haystack, const wchar_t *needle);
+
+gcc_pure
+bool
+StringEndsWith(const wchar_t *haystack, const wchar_t *needle);
+
+/**
+ * Returns the portion of the string after a prefix.  If the string
+ * does not begin with the specified prefix, this function returns
+ * nullptr.
+ */
+gcc_nonnull_all
+const wchar_t *
+StringAfterPrefix(const wchar_t *string, const wchar_t *prefix);
+
+/**
+ * Check if the given string ends with the specified suffix.  If yes,
+ * returns the position of the suffix, and nullptr otherwise.
+ */
+gcc_pure
+const wchar_t *
+FindStringSuffix(const wchar_t *p, const wchar_t *suffix);
+
+#endif