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diff --git a/src/util/CharUtil.hxx b/src/util/CharUtil.hxx
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+/*
+ * Copyright (C) 2011-2013 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 CHAR_UTIL_HPP
+#define CHAR_UTIL_HPP
+
+constexpr
+static inline bool
+IsASCII(const unsigned char ch)
+{
+  return ch < 0x80;
+}
+
+constexpr
+static inline bool
+IsASCII(const char ch)
+{
+  return IsASCII((unsigned char)ch);
+}
+
+static inline bool
+IsWhitespaceOrNull(const char ch)
+{
+  return (unsigned char)ch <= 0x20;
+}
+
+static inline bool
+IsWhitespaceNotNull(const char ch)
+{
+  return ch > 0 && ch <= 0x20;
+}
+
+constexpr
+static inline bool
+IsPrintableASCII(char ch)
+{
+  return (signed char)ch >= 0x20;
+}
+
+constexpr
+static inline bool
+IsDigitASCII(char ch)
+{
+  return ch >= '0' && ch <= '9';
+}
+
+constexpr
+static inline bool
+IsUpperAlphaASCII(char ch)
+{
+  return ch >= 'A' && ch <= 'Z';
+}
+
+constexpr
+static inline bool
+IsLowerAlphaASCII(char ch)
+{
+  return ch >= 'a' && ch <= 'z';
+}
+
+constexpr
+static inline bool
+IsAlphaASCII(char ch)
+{
+  return IsUpperAlphaASCII(ch) || IsLowerAlphaASCII(ch);
+}
+
+constexpr
+static inline bool
+IsAlphaNumericASCII(char ch)
+{
+  return IsAlphaASCII(ch) || IsDigitASCII(ch);
+}
+
+/**
+ * Convert the specified ASCII character (0x00..0x7f) to upper case.
+ * Unlike toupper(), it ignores the system locale.
+ */
+constexpr
+static inline char
+ToUpperASCII(char ch)
+{
+  return ch >= 'a' && ch <= 'z'
+    ? (ch - ('a' - 'A'))
+    : ch;
+}
+
+#endif