/* Symbol concatenation utilities.+
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   Copyright (C) 1998, 2000 Free Software Foundation, Inc.+
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+
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   This program is free software; you can redistribute it and/or modify+
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   it under the terms of the GNU General Public License as published by+
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   the Free Software Foundation; either version 2 of the License, or+
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   (at your option) any later version.+
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+
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   This program is distributed in the hope that it will be useful,+
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   but WITHOUT ANY WARRANTY; without even the implied warranty of+
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   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the+
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   GNU General Public License for more details.+
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 +
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   You should have received a copy of the GNU General Public License along+
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   with this program; if not, write to the Free Software Foundation, Inc.,+
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   51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.  */+
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+
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#ifndef SYM_CAT_H+
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#define SYM_CAT_H+
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+
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#if defined (__STDC__) || defined (ALMOST_STDC) || defined (HAVE_STRINGIZE)+
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#define CONCAT2(a,b)	 a##b+
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#define CONCAT3(a,b,c)	 a##b##c+
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#define CONCAT4(a,b,c,d) a##b##c##d+
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#define STRINGX(s) #s+
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#else+
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/* Note one should never pass extra whitespace to the CONCATn macros,+
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   e.g. CONCAT2(foo, bar) because traditonal C will keep the space between+
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   the two labels instead of concatenating them.  Instead, make sure to+
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   write CONCAT2(foo,bar).  */+
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#define CONCAT2(a,b)	 a/**/b+
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#define CONCAT3(a,b,c)	 a/**/b/**/c+
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#define CONCAT4(a,b,c,d) a/**/b/**/c/**/d+
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#define STRINGX(s) "s"+
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#endif+
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+
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#define XCONCAT2(a,b)     CONCAT2(a,b)+
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#define XCONCAT3(a,b,c)   CONCAT3(a,b,c)+
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#define XCONCAT4(a,b,c,d) CONCAT4(a,b,c,d)+
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+
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/* Note the layer of indirection here is typically used to allow+
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   stringification of the expansion of macros.  I.e. "#define foo+
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   bar", "XSTRING(foo)", to yield "bar".  Be aware that this only+
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   works for __STDC__, not for traditional C which will still resolve+
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   to "foo".  */+
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#define XSTRING(s) STRINGX(s) +
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+
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#endif /* SYM_CAT_H */+
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