1/* Symbol concatenation utilities.
2
3   Copyright (C) 1998, 2000 Free Software Foundation, Inc.
4
5   This program is free software; you can redistribute it and/or modify
6   it under the terms of the GNU General Public License as published by
7   the Free Software Foundation; either version 2 of the License, or
8   (at your option) any later version.
9
10   This program is distributed in the hope that it will be useful,
11   but WITHOUT ANY WARRANTY; without even the implied warranty of
12   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
13   GNU General Public License for more details.
14
15   You should have received a copy of the GNU General Public License along
16   with this program; if not, write to the Free Software Foundation, Inc.,
17   51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.  */
18
19#ifndef SYM_CAT_H
20#define SYM_CAT_H
21
22#if defined (__STDC__) || defined (ALMOST_STDC) || defined (HAVE_STRINGIZE)
23#define CONCAT2(a,b)	 a##b
24#define CONCAT3(a,b,c)	 a##b##c
25#define CONCAT4(a,b,c,d) a##b##c##d
26#define STRINGX(s) #s
27#else
28/* Note one should never pass extra whitespace to the CONCATn macros,
29   e.g. CONCAT2(foo, bar) because traditonal C will keep the space between
30   the two labels instead of concatenating them.  Instead, make sure to
31   write CONCAT2(foo,bar).  */
32#define CONCAT2(a,b)	 a/**/b
33#define CONCAT3(a,b,c)	 a/**/b/**/c
34#define CONCAT4(a,b,c,d) a/**/b/**/c/**/d
35#define STRINGX(s) "s"
36#endif
37
38#define XCONCAT2(a,b)     CONCAT2(a,b)
39#define XCONCAT3(a,b,c)   CONCAT3(a,b,c)
40#define XCONCAT4(a,b,c,d) CONCAT4(a,b,c,d)
41
42/* Note the layer of indirection here is typically used to allow
43   stringification of the expansion of macros.  I.e. "#define foo
44   bar", "XSTRING(foo)", to yield "bar".  Be aware that this only
45   works for __STDC__, not for traditional C which will still resolve
46   to "foo".  */
47#define XSTRING(s) STRINGX(s)
48
49#endif /* SYM_CAT_H */
50