130bfbdd7a
* symcat.h: Honor autoconf macro HAVE_STRINGIZE. Add
comments/caveats with regard to traditional C behavior.
From-SVN: r33209
50 lines
1.8 KiB
C
50 lines
1.8 KiB
C
/* Symbol concatenation utilities.
|
|
|
|
Copyright (C) 1998, 2000 Free Software Foundation, Inc.
|
|
|
|
This program is free software; you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation; either version 2 of the License, or
|
|
(at your option) any later version.
|
|
|
|
This program is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License along
|
|
with this program; if not, write to the Free Software Foundation, Inc.,
|
|
59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
|
|
|
|
#ifndef SYM_CAT_H
|
|
#define SYM_CAT_H
|
|
|
|
#if defined (__STDC__) || defined (ALMOST_STDC) || defined (HAVE_STRINGIZE)
|
|
#define CONCAT2(a,b) a##b
|
|
#define CONCAT3(a,b,c) a##b##c
|
|
#define CONCAT4(a,b,c,d) a##b##c##d
|
|
#define STRINGX(s) #s
|
|
#else
|
|
/* Note one should never pass extra whitespace to the CONCATn macros,
|
|
e.g. CONCAT2(foo, bar) because traditonal C will keep the space between
|
|
the two labels instead of concatenating them. Instead, make sure to
|
|
write CONCAT2(foo,bar). */
|
|
#define CONCAT2(a,b) a/**/b
|
|
#define CONCAT3(a,b,c) a/**/b/**/c
|
|
#define CONCAT4(a,b,c,d) a/**/b/**/c/**/d
|
|
#define STRINGX(s) "s"
|
|
#endif
|
|
|
|
#define XCONCAT2(a,b) CONCAT2(a,b)
|
|
#define XCONCAT3(a,b,c) CONCAT3(a,b,c)
|
|
#define XCONCAT4(a,b,c,d) CONCAT4(a,b,c,d)
|
|
|
|
/* Note the layer of indirection here is typically used to allow
|
|
stringification of the expansion of macros. I.e. "#define foo
|
|
bar", "XSTRING(foo)", to yield "bar". Be aware that this only
|
|
works for __STDC__, not for traditional C which will still resolve
|
|
to "foo". */
|
|
#define XSTRING(s) STRINGX(s)
|
|
|
|
#endif SYM_CAT_H
|