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diff --git a/generic/tclStringTrim.h b/generic/tclStringTrim.h
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+/*
+ * tclStringTrim.h --
+ *
+ *	This file contains the definition of what characters are to be trimmed
+ *	from a string by [string trim] by default. It's only needed by Tcl's
+ *	implementation; it does not form a public or private API at all.
+ *
+ * Copyright (c) 1987-1993 The Regents of the University of California.
+ * Copyright (c) 1994-1997 Sun Microsystems, Inc.
+ * Copyright (c) 1998-2000 Scriptics Corporation.
+ * Copyright (c) 2002 ActiveState Corporation.
+ * Copyright (c) 2003-2013 Donal K. Fellows.
+ *
+ * See the file "license.terms" for information on usage and redistribution of
+ * this file, and for a DISCLAIMER OF ALL WARRANTIES.
+ */
+
+#ifndef TCL_STRING_TRIM_H
+#define TCL_STRING_TRIM_H
+
+/*
+ * Default set of characters to trim in [string trim] and friends. This is a
+ * UTF-8 literal string containing all Unicode space characters. [TIP #413]
+ */
+
+#define DEFAULT_TRIM_SET \
+	"\x09\x0a\x0b\x0c\x0d " /* ASCII */\
+	"\xc0\x80" /*     nul (U+0000) */\
+	"\xc2\x85" /*     next line (U+0085) */\
+	"\xc2\xa0" /*     non-breaking space (U+00a0) */\
+	"\xe1\x9a\x80" /* ogham space mark (U+1680) */ \
+	"\xe1\xa0\x8e" /* mongolian vowel separator (U+180e) */\
+	"\xe2\x80\x80" /* en quad (U+2000) */\
+	"\xe2\x80\x81" /* em quad (U+2001) */\
+	"\xe2\x80\x82" /* en space (U+2002) */\
+	"\xe2\x80\x83" /* em space (U+2003) */\
+	"\xe2\x80\x84" /* three-per-em space (U+2004) */\
+	"\xe2\x80\x85" /* four-per-em space (U+2005) */\
+	"\xe2\x80\x86" /* six-per-em space (U+2006) */\
+	"\xe2\x80\x87" /* figure space (U+2007) */\
+	"\xe2\x80\x88" /* punctuation space (U+2008) */\
+	"\xe2\x80\x89" /* thin space (U+2009) */\
+	"\xe2\x80\x8a" /* hair space (U+200a) */\
+	"\xe2\x80\x8b" /* zero width space (U+200b) */\
+	"\xe2\x80\xa8" /* line separator (U+2028) */\
+	"\xe2\x80\xa9" /* paragraph separator (U+2029) */\
+	"\xe2\x80\xaf" /* narrow no-break space (U+202f) */\
+	"\xe2\x81\x9f" /* medium mathematical space (U+205f) */\
+	"\xe2\x81\xa0" /* word joiner (U+2060) */\
+	"\xe3\x80\x80" /* ideographic space (U+3000) */\
+	"\xef\xbb\xbf" /* zero width no-break space (U+feff) */
+
+/*
+ * The whitespace trimming set used when [concat]enating. This is a subset of
+ * the above, and deliberately so.
+ */
+
+#define CONCAT_TRIM_SET " \f\v\r\t\n"
+
+#endif /* TCL_STRING_TRIM_H */
+
+/*
+ * Local Variables:
+ * mode: c
+ * c-basic-offset: 4
+ * fill-column: 78
+ * End:
+ */