util/StringUtil: move comparison functions to StringCompare.cxx

src/util/WStringCompare.cxx

@@ -0,0 +1,70 @@
+/*
+ * Copyright (C) 2003-2015 The Music Player Daemon Project
+ * http://www.musicpd.org
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include "WStringCompare.hxx"
+#include "WStringAPI.hxx"
+
+#include <assert.h>
+#include <string.h>
+
+bool
+StringStartsWith(const wchar_t *haystack, const wchar_t *needle)
+{
+	return memcmp(haystack, needle, StringLength(needle) * sizeof(needle[0])) == 0;
+}
+
+bool
+StringEndsWith(const wchar_t *haystack, const wchar_t *needle)
+{
+	const size_t haystack_length = StringLength(haystack);
+	const size_t needle_length = StringLength(needle);
+
+	return haystack_length >= needle_length &&
+		StringIsEqual(haystack + haystack_length - needle_length, needle);
+}
+
+const wchar_t *
+StringAfterPrefix(const wchar_t *string, const wchar_t *prefix)
+{
+#if !CLANG_CHECK_VERSION(3,6)
+	/* disabled on clang due to -Wtautological-pointer-compare */
+	assert(string != nullptr);
+	assert(prefix != nullptr);
+#endif
+
+	size_t prefix_length = StringLength(prefix);
+	return StringIsEqual(string, prefix, prefix_length)
+		? string + prefix_length
+		: nullptr;
+}
+
+const wchar_t *
+FindStringSuffix(const wchar_t *p, const wchar_t *suffix)
+{
+	const size_t p_length = StringLength(p);
+	const size_t suffix_length = StringLength(suffix);
+
+	if (p_length < suffix_length)
+		return nullptr;
+
+	const auto *q = p + p_length - suffix_length;
+	return memcmp(q, suffix, suffix_length * sizeof(*suffix)) == 0
+		? q
+		: nullptr;
+}