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diff --git a/Build/source/texk/kpathsea/concat3.c b/Build/source/texk/kpathsea/concat3.c
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+/* concat3.c: concatenate three strings.
+
+ Copyright 1992, 2008 Karl Berry.
+
+ This library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 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
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with this library; if not, see <http://www.gnu.org/licenses/>. */
+
+#include <kpathsea/config.h>
+
+
+string
+concat3 (const_string s1, const_string s2, const_string s3)
+{
+ int s2l = s2 ? strlen (s2) : 0;
+ int s3l = s3 ? strlen (s3) : 0;
+ string answer
+ = (string) xmalloc (strlen(s1) + s2l + s3l + 1);
+ strcpy (answer, s1);
+ if (s2) strcat (answer, s2);
+ if (s3) strcat (answer, s3);
+
+ return answer;
+}