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/* Symbol concatenation utilities.

   Copyright (C) 1998, 2000 Free Software Foundation, Inc.

   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; either version 2 of the License, or

   (at your option) any later version.

   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.,

   51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.  */

#ifndef SYM_CAT_H

#define SYM_CAT_H

#if defined (__STDC__) || defined (ALMOST_STDC) || defined (HAVE_STRINGIZE)

#define CONCAT2(a,b)     a##b

#define CONCAT3(a,b,c)   a##b##c

#define CONCAT4(a,b,c,d) a##b##c##d

#define STRINGX(s) #s

#else

/* Note one should never pass extra whitespace to the CONCATn macros,

   e.g. CONCAT2(foo, bar) because traditonal C will keep the space between

   the two labels instead of concatenating them.  Instead, make sure to

   write CONCAT2(foo,bar).  */

#define CONCAT2(a,b)     a/**/b

#define CONCAT3(a,b,c)   a/**/b/**/c

#define CONCAT4(a,b,c,d) a/**/b/**/c/**/d

#define STRINGX(s) "s"

#endif

#define XCONCAT2(a,b)     CONCAT2(a,b)

#define XCONCAT3(a,b,c)   CONCAT3(a,b,c)

#define XCONCAT4(a,b,c,d) CONCAT4(a,b,c,d)

/* Note the layer of indirection here is typically used to allow

   stringification of the expansion of macros.  I.e. "#define foo

   bar", "XSTRING(foo)", to yield "bar".  Be aware that this only

   works for __STDC__, not for traditional C which will still resolve

   to "foo".  */

#define XSTRING(s) STRINGX(s) 

#endif /* SYM_CAT_H */