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diff --git a/lib/atou.c b/lib/atou.c
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+++ b/lib/atou.c
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+/* atou.c: like atoi, but if the number is negative, abort.
+
+Copyright (C) 1992, 95 Free Software Foundation, Inc.
+
+This library is free software; you can redistribute it and/or
+modify it under the terms of the GNU Library General Public
+License as published by the Free Software Foundation; either
+version 2 of the License, or (at your option) any later version.
+
+This library 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
+Library General Public License for more details.
+
+You should have received a copy of the GNU Library General Public
+License along with this library; if not, write to the Free Software
+Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
+
+#include "config.h"
+
+unsigned
+atou P1C(const_string, s)
+{
+  int i = atoi (s);
+  
+  if (i < 0)
+    FATAL1 ("I expected a positive number, not %d", i);
+  
+  return i;
+}