1 /* ANSI and traditional C compatability macros
2 Copyright 1991, 1992 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
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.
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.
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the Free Software
17 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
19 /* ANSI and traditional C compatibility macros
21 ANSI C is assumed if __STDC__ is #defined.
23 Macro ANSI C definition Traditional C definition
24 ----- ---- - ---------- ----------- - ----------
26 LONG_DOUBLE `long double' `double'
28 VOLATILE `volatile' `'
30 PTRCONST `void *const' `char *'
32 DEFUN (name, arglist, args)
34 Defines function NAME.
36 ARGLIST lists the arguments, separated by commas and enclosed in
37 parentheses. ARGLIST becomes the argument list in traditional C.
39 ARGS list the arguments with their types. It becomes a prototype in
40 ANSI C, and the type declarations in traditional C. Arguments should
41 be separated with `AND'. For functions with a variable number of
42 arguments, the last thing listed should be `DOTS'.
46 Defines a function NAME, which takes no arguments.
48 obsolete -- EXFUN (name, (prototype)) -- obsolete.
50 Replaced by PARAMS. Do not use; will disappear someday soon.
51 Was used in external function declarations.
52 In ANSI C it is `NAME PROTOTYPE' (so PROTOTYPE should be enclosed in
53 parentheses). In traditional C it is `NAME()'.
54 For a function that takes no arguments, PROTOTYPE should be `(void)'.
58 We could use the EXFUN macro to handle prototype declarations, but
59 the name is misleading and the result is ugly. So we just define a
60 simple macro to handle the parameter lists, as in:
62 static int foo PARAMS ((int, char));
64 This produces: `static int foo();' or `static int foo (int, char);'
66 EXFUN would have done it like this:
68 static int EXFUN (foo, (int, char));
70 but the function is not external...and it's hard to visually parse
71 the function name out of the mess. EXFUN should be considered
72 obsolete; new code should be written to use PARAMS.
75 extern int printf PARAMS ((CONST char *format DOTS));
76 int DEFUN(fprintf, (stream, format),
77 FILE *stream AND CONST char *format DOTS) { ... }
78 void DEFUN_VOID(abort) { ... }
86 /* Every source file includes this file,
87 so they will all get the switch for lint. */
91 #if defined (__STDC__) || defined (_AIX)
92 /* the AIX xlc compiler implements all these things even when it is in
93 a mode which doesn't define __STDC__. */
96 #define PTRCONST void *CONST
97 #define LONG_DOUBLE long double
102 #define VOLATILE volatile
103 #define SIGNED signed
106 #define EXFUN(name, proto) name proto
107 #define DEFUN(name, arglist, args) name(args)
108 #define DEFUN_VOID(name) name(void)
110 #define PROTO(type, name, arglist) type name arglist
111 #define PARAMS(paramlist) paramlist
113 #else /* Not ANSI C. */
117 #define LONG_DOUBLE double
126 #define EXFUN(name, proto) name()
127 #define DEFUN(name, arglist, args) name arglist args;
128 #define DEFUN_VOID(name) name()
129 #define PROTO(type, name, arglist) type name ()
130 #define PARAMS(paramlist) ()
134 #endif /* ansidecl.h */
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