nkeynes@362 | 1 | /* Symbol concatenation utilities.
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nkeynes@362 | 2 |
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nkeynes@362 | 3 | Copyright (C) 1998, 2000 Free Software Foundation, Inc.
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nkeynes@362 | 4 |
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nkeynes@362 | 5 | This program is free software; you can redistribute it and/or modify
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nkeynes@362 | 6 | it under the terms of the GNU General Public License as published by
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nkeynes@362 | 7 | the Free Software Foundation; either version 2 of the License, or
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nkeynes@362 | 8 | (at your option) any later version.
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nkeynes@362 | 9 |
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nkeynes@362 | 10 | This program is distributed in the hope that it will be useful,
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nkeynes@362 | 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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nkeynes@362 | 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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nkeynes@362 | 13 | GNU General Public License for more details.
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nkeynes@362 | 14 |
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nkeynes@362 | 15 | You should have received a copy of the GNU General Public License along
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nkeynes@362 | 16 | with this program; if not, write to the Free Software Foundation, Inc.,
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nkeynes@362 | 17 | 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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nkeynes@362 | 18 |
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nkeynes@362 | 19 | #ifndef SYM_CAT_H
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nkeynes@362 | 20 | #define SYM_CAT_H
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nkeynes@362 | 21 |
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nkeynes@362 | 22 | #if defined (__STDC__) || defined (ALMOST_STDC) || defined (HAVE_STRINGIZE)
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nkeynes@362 | 23 | #define CONCAT2(a,b) a##b
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nkeynes@362 | 24 | #define CONCAT3(a,b,c) a##b##c
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nkeynes@362 | 25 | #define CONCAT4(a,b,c,d) a##b##c##d
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nkeynes@362 | 26 | #define STRINGX(s) #s
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nkeynes@362 | 27 | #else
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nkeynes@362 | 28 | /* Note one should never pass extra whitespace to the CONCATn macros,
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nkeynes@362 | 29 | e.g. CONCAT2(foo, bar) because traditonal C will keep the space between
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nkeynes@362 | 30 | the two labels instead of concatenating them. Instead, make sure to
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nkeynes@362 | 31 | write CONCAT2(foo,bar). */
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nkeynes@362 | 32 | #define CONCAT2(a,b) a/**/b
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nkeynes@362 | 33 | #define CONCAT3(a,b,c) a/**/b/**/c
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nkeynes@362 | 34 | #define CONCAT4(a,b,c,d) a/**/b/**/c/**/d
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nkeynes@362 | 35 | #define STRINGX(s) "s"
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nkeynes@362 | 36 | #endif
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nkeynes@362 | 37 |
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nkeynes@362 | 38 | #define XCONCAT2(a,b) CONCAT2(a,b)
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nkeynes@362 | 39 | #define XCONCAT3(a,b,c) CONCAT3(a,b,c)
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nkeynes@362 | 40 | #define XCONCAT4(a,b,c,d) CONCAT4(a,b,c,d)
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nkeynes@362 | 41 |
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nkeynes@362 | 42 | /* Note the layer of indirection here is typically used to allow
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nkeynes@362 | 43 | stringification of the expansion of macros. I.e. "#define foo
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nkeynes@362 | 44 | bar", "XSTRING(foo)", to yield "bar". Be aware that this only
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nkeynes@362 | 45 | works for __STDC__, not for traditional C which will still resolve
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nkeynes@362 | 46 | to "foo". */
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nkeynes@362 | 47 | #define XSTRING(s) STRINGX(s)
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nkeynes@362 | 48 |
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nkeynes@362 | 49 | #endif /* SYM_CAT_H */
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