| 1 | /* Symbol concatenation utilities.
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| 2 |
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| 3 | Copyright (C) 1998-2021 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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