1 /* Symbol concatenation utilities. 2 3 Copyright (C) 1998, 2000 Free Software Foundation, Inc. 4 5 This program is free software; you can redistribute it and/or modify 6 it under the terms of the GNU General Public License as published by 7 the Free Software Foundation; either version 2 of the License, or 8 (at your option) any later version. 9 10 This program is distributed in the hope that it will be useful, 11 but WITHOUT ANY WARRANTY; without even the implied warranty of 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 GNU General Public License for more details. 14 15 You should have received a copy of the GNU General Public License along 16 with this program; if not, write to the Free Software Foundation, Inc., 17 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ 18 19 #ifndef SYM_CAT_H 20 #define SYM_CAT_H 21 22 #if defined (__STDC__) || defined (ALMOST_STDC) || defined (HAVE_STRINGIZE) 23 #define CONCAT2(a,b) a##b 24 #define CONCAT3(a,b,c) a##b##c 25 #define CONCAT4(a,b,c,d) a##b##c##d 26 #define STRINGX(s) #s 27 #else 28 /* Note one should never pass extra whitespace to the CONCATn macros, 29 e.g. CONCAT2(foo, bar) because traditonal C will keep the space between 30 the two labels instead of concatenating them. Instead, make sure to 31 write CONCAT2(foo,bar). */ 32 #define CONCAT2(a,b) a/**/b 33 #define CONCAT3(a,b,c) a/**/b/**/c 34 #define CONCAT4(a,b,c,d) a/**/b/**/c/**/d 35 #define STRINGX(s) "s" 36 #endif 37 38 #define XCONCAT2(a,b) CONCAT2(a,b) 39 #define XCONCAT3(a,b,c) CONCAT3(a,b,c) 40 #define XCONCAT4(a,b,c,d) CONCAT4(a,b,c,d) 41 42 /* Note the layer of indirection here is typically used to allow 43 stringification of the expansion of macros. I.e. "#define foo 44 bar", "XSTRING(foo)", to yield "bar". Be aware that this only 45 works for __STDC__, not for traditional C which will still resolve 46 to "foo". */ 47 #define XSTRING(s) STRINGX(s) 48 49 #endif /* SYM_CAT_H */ 50