1 /* Symbol concatenation utilities. 2 3 Copyright (C) 1998, 2000, 2010 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 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, 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 CONCAT5(a,b,c,d,e) a##b##c##d##e 27 #define CONCAT6(a,b,c,d,e,f) a##b##c##d##e##f 28 #define STRINGX(s) #s 29 #else 30 /* Note one should never pass extra whitespace to the CONCATn macros, 31 e.g. CONCAT2(foo, bar) because traditonal C will keep the space between 32 the two labels instead of concatenating them. Instead, make sure to 33 write CONCAT2(foo,bar). */ 34 #define CONCAT2(a,b) a/**/b 35 #define CONCAT3(a,b,c) a/**/b/**/c 36 #define CONCAT4(a,b,c,d) a/**/b/**/c/**/d 37 #define CONCAT5(a,b,c,d,e) a/**/b/**/c/**/d/**/e 38 #define CONCAT6(a,b,c,d,e,f) a/**/b/**/c/**/d/**/e/**/f 39 #define STRINGX(s) "s" 40 #endif 41 42 #define XCONCAT2(a,b) CONCAT2(a,b) 43 #define XCONCAT3(a,b,c) CONCAT3(a,b,c) 44 #define XCONCAT4(a,b,c,d) CONCAT4(a,b,c,d) 45 #define XCONCAT5(a,b,c,d,e) CONCAT5(a,b,c,d,e) 46 #define XCONCAT6(a,b,c,d,e,f) CONCAT6(a,b,c,d,e,f) 47 48 /* Note the layer of indirection here is typically used to allow 49 stringification of the expansion of macros. I.e. "#define foo 50 bar", "XSTRING(foo)", to yield "bar". Be aware that this only 51 works for __STDC__, not for traditional C which will still resolve 52 to "foo". */ 53 #define XSTRING(s) STRINGX(s) 54 55 #endif /* SYM_CAT_H */ 56