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1 /* Symbol concatenation utilities.
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2
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3 Copyright (C) 1998, 2000 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 STRINGX(s) #s
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27 #else
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28 /* Note one should never pass extra whitespace to the CONCATn macros,
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29 e.g. CONCAT2(foo, bar) because traditonal C will keep the space between
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30 the two labels instead of concatenating them. Instead, make sure to
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31 write CONCAT2(foo,bar). */
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32 #define CONCAT2(a,b) a/**/b
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33 #define CONCAT3(a,b,c) a/**/b/**/c
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34 #define CONCAT4(a,b,c,d) a/**/b/**/c/**/d
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35 #define STRINGX(s) "s"
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36 #endif
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37
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38 #define XCONCAT2(a,b) CONCAT2(a,b)
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39 #define XCONCAT3(a,b,c) CONCAT3(a,b,c)
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40 #define XCONCAT4(a,b,c,d) CONCAT4(a,b,c,d)
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41
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42 /* Note the layer of indirection here is typically used to allow
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43 stringification of the expansion of macros. I.e. "#define foo
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44 bar", "XSTRING(foo)", to yield "bar". Be aware that this only
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45 works for __STDC__, not for traditional C which will still resolve
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46 to "foo". */
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47 #define XSTRING(s) STRINGX(s)
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48
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49 #endif /* SYM_CAT_H */
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