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50 lines
1.9 KiB
C
50 lines
1.9 KiB
C
/* Symbol concatenation utilities.
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Copyright (C) 1998, 2000 Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along
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with this program; if not, write to the Free Software Foundation, Inc.,
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59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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#ifndef SYM_CAT_H
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#define SYM_CAT_H
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#if defined (__STDC__) || defined (ALMOST_STDC) || defined (HAVE_STRINGIZE)
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#define CONCAT2(a,b) a##b
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#define CONCAT3(a,b,c) a##b##c
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#define CONCAT4(a,b,c,d) a##b##c##d
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#define STRINGX(s) #s
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#else
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/* Note one should never pass extra whitespace to the CONCATn macros,
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e.g. CONCAT2(foo, bar) because traditonal C will keep the space between
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the two labels instead of concatenating them. Instead, make sure to
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write CONCAT2(foo,bar). */
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#define CONCAT2(a,b) a/**/b
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#define CONCAT3(a,b,c) a/**/b/**/c
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#define CONCAT4(a,b,c,d) a/**/b/**/c/**/d
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#define STRINGX(s) "s"
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#endif
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#define XCONCAT2(a,b) CONCAT2(a,b)
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#define XCONCAT3(a,b,c) CONCAT3(a,b,c)
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#define XCONCAT4(a,b,c,d) CONCAT4(a,b,c,d)
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/* Note the layer of indirection here is typically used to allow
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stringification of the expansion of macros. I.e. "#define foo
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bar", "XSTRING(foo)", to yield "bar". Be aware that this only
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works for __STDC__, not for traditional C which will still resolve
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to "foo". */
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#define XSTRING(s) STRINGX(s)
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#endif /* SYM_CAT_H */
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