| 1 | /* Symbol concatenation utilities. |
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| 2 | |
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| 3 | Copyright (C) 1998-2015 Free Software Foundation, Inc. |
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| 4 | |
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| 5 | This program is free software; you can redistribute it and/or modify |
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| 6 | it under the terms of the GNU General Public License as published by |
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| 7 | the Free Software Foundation; either version 2 of the License, or |
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| 8 | (at your option) any later version. |
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| 9 | |
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| 10 | This program is distributed in the hope that it will be useful, |
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| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 13 | GNU General Public License for more details. |
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| 14 | |
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| 15 | You should have received a copy of the GNU General Public License along |
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| 16 | with this program; if not, write to the Free Software Foundation, Inc., |
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| 17 | 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */ |
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| 18 | |
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| 19 | #ifndef SYM_CAT_H |
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| 20 | #define SYM_CAT_H |
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| 21 | |
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| 22 | #if defined (__STDC__) || defined (ALMOST_STDC) || defined (HAVE_STRINGIZE) |
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| 23 | #define CONCAT2(a,b) a##b |
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| 24 | #define CONCAT3(a,b,c) a##b##c |
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| 25 | #define CONCAT4(a,b,c,d) a##b##c##d |
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| 26 | #define CONCAT5(a,b,c,d,e) a##b##c##d##e |
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| 27 | #define CONCAT6(a,b,c,d,e,f) a##b##c##d##e##f |
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| 28 | #define STRINGX(s) #s |
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| 29 | #else |
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| 30 | /* Note one should never pass extra whitespace to the CONCATn macros, |
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| 31 | e.g. CONCAT2(foo, bar) because traditonal C will keep the space between |
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| 32 | the two labels instead of concatenating them. Instead, make sure to |
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| 33 | write CONCAT2(foo,bar). */ |
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| 34 | #define CONCAT2(a,b) a/**/b |
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| 35 | #define CONCAT3(a,b,c) a/**/b/**/c |
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| 36 | #define CONCAT4(a,b,c,d) a/**/b/**/c/**/d |
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| 37 | #define CONCAT5(a,b,c,d,e) a/**/b/**/c/**/d/**/e |
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| 38 | #define CONCAT6(a,b,c,d,e,f) a/**/b/**/c/**/d/**/e/**/f |
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| 39 | #define STRINGX(s) "s" |
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| 40 | #endif |
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| 41 | |
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| 42 | #define XCONCAT2(a,b) CONCAT2(a,b) |
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| 43 | #define XCONCAT3(a,b,c) CONCAT3(a,b,c) |
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| 44 | #define XCONCAT4(a,b,c,d) CONCAT4(a,b,c,d) |
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| 45 | #define XCONCAT5(a,b,c,d,e) CONCAT5(a,b,c,d,e) |
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| 46 | #define XCONCAT6(a,b,c,d,e,f) CONCAT6(a,b,c,d,e,f) |
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| 47 | |
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| 48 | /* Note the layer of indirection here is typically used to allow |
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| 49 | stringification of the expansion of macros. I.e. "#define foo |
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| 50 | bar", "XSTRING(foo)", to yield "bar". Be aware that this only |
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| 51 | works for __STDC__, not for traditional C which will still resolve |
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| 52 | to "foo". */ |
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| 53 | #define XSTRING(s) STRINGX(s) |
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| 54 | |
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| 55 | #endif /* SYM_CAT_H */ |
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