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diff --git a/lib_internal/util-isnumber.hc b/lib_internal/util-isnumber.hc
new file mode 100644
index 0000000..102e02d
--- /dev/null
+++ b/lib_internal/util-isnumber.hc
@@ -0,0 +1,52 @@
+// $Id: util-isnumber.hc 2255 2006-01-22 11:23:47Z ensc $    --*- c -*--
+
+// Copyright (C) 2006 Enrico Scholz <enrico.scholz@informatik.tu-chemnitz.de>
+//  
+// 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; version 2 of the License.
+//  
+// 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+
+#include <stdbool.h>
+#include <stdlib.h>
+#include <errno.h>
+
+#define ENSC_DECL_UTIL_ISNUMBER(NAME,TYPE,FUNC)			\
+  bool								\
+  NAME(char const *str, TYPE *result, bool is_strict)		\
+  {								\
+    char *		errptr;					\
+    TYPE		val;					\
+    unsigned int	fac = 1;				\
+								\
+    errno = 0;							\
+    val   = FUNC(str, &errptr, 0);				\
+    if (errno==ERANGE)						\
+      return false;						\
+    if (errptr!=str && !is_strict) {				\
+      switch (*errptr) {					\
+	case 'M'	:  fac *= 1024; /* fallthrough */	\
+	case 'K'	:  fac *= 1024; ++errptr; break;	\
+	case 'm'	:  fac *= 1000; /* fallthrough */	\
+	case 'k'	:  fac *= 1000; ++errptr; break;	\
+	default	:  break;					\
+      }								\
+    }								\
+    if (!checkConstraints(val,fac))				\
+      return false;						\
+								\
+    if (*errptr!='\0' || errptr==str)				\
+      return false;						\
+    else {							\
+      if (result) *result = val*fac;				\
+      return true;						\
+    }								\
+  }