/* 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 */