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1/* ANSI and traditional C compatibility macros
2 Copyright 1991, 1992 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4
5This program is free software; you can redistribute it and/or modify
6it under the terms of the GNU General Public License as published by
7the Free Software Foundation; either version 2 of the License, or
8(at your option) any later version.
9
10This program is distributed in the hope that it will be useful,
11but WITHOUT ANY WARRANTY; without even the implied warranty of
12MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13GNU General Public License for more details.
14
15You should have received a copy of the GNU General Public License
16along with this program; if not, write to the Free Software
17Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
18
19/* ANSI and traditional C compatibility macros
20
21 ANSI C is assumed if __STDC__ is #defined.
22
23 Macro ANSI C definition Traditional C definition
24 ----- ---- - ---------- ----------- - ----------
25 PTR `void *' `char *'
26 LONG_DOUBLE `long double' `double'
27 VOLATILE `volatile' `'
28 SIGNED `signed' `'
29 PTRCONST `void *const' `char *'
30 ANSI_PROTOTYPES 1 not defined
31
32 CONST is also defined, but is obsolete. Just use const.
33
34 DEFUN (name, arglist, args)
35
36 Defines function NAME.
37
38 ARGLIST lists the arguments, separated by commas and enclosed in
39 parentheses. ARGLIST becomes the argument list in traditional C.
40
41 ARGS list the arguments with their types. It becomes a prototype in
42 ANSI C, and the type declarations in traditional C. Arguments should
43 be separated with `AND'. For functions with a variable number of
44 arguments, the last thing listed should be `DOTS'.
45
46 DEFUN_VOID (name)
47
48 Defines a function NAME, which takes no arguments.
49
50 obsolete -- EXFUN (name, (prototype)) -- obsolete.
51
52 Replaced by PARAMS. Do not use; will disappear someday soon.
53 Was used in external function declarations.
54 In ANSI C it is `NAME PROTOTYPE' (so PROTOTYPE should be enclosed in
55 parentheses). In traditional C it is `NAME()'.
56 For a function that takes no arguments, PROTOTYPE should be `(void)'.
57
58 PARAMS ((args))
59
60 We could use the EXFUN macro to handle prototype declarations, but
61 the name is misleading and the result is ugly. So we just define a
62 simple macro to handle the parameter lists, as in:
63
64 static int foo PARAMS ((int, char));
65
66 This produces: `static int foo();' or `static int foo (int, char);'
67
68 EXFUN would have done it like this:
69
70 static int EXFUN (foo, (int, char));
71
72 but the function is not external...and it's hard to visually parse
73 the function name out of the mess. EXFUN should be considered
74 obsolete; new code should be written to use PARAMS.
75
76 For example:
77 extern int printf PARAMS ((CONST char *format DOTS));
78 int DEFUN(fprintf, (stream, format),
79 FILE *stream AND CONST char *format DOTS) { ... }
80 void DEFUN_VOID(abort) { ... }
81*/
82
83#ifndef _ANSIDECL_H
84
85#define _ANSIDECL_H 1
86
87
88/* Every source file includes this file,
89 so they will all get the switch for lint. */
90/* LINTLIBRARY */
91
92
93#if defined (__STDC__) || defined (_AIX) || (defined (__mips) && defined (_SYSTYPE_SVR4)) || defined(WIN32)
94/* All known AIX compilers implement these things (but don't always
95 define __STDC__). The RISC/OS MIPS compiler defines these things
96 in SVR4 mode, but does not define __STDC__. */
97
98#define PTR void *
99#define PTRCONST void *CONST
100#define LONG_DOUBLE long double
101
102#define AND ,
103#define NOARGS void
104#define CONST const
105#define VOLATILE volatile
106#define SIGNED signed
107#define DOTS , ...
108
109#define EXFUN(name, proto) name proto
110#define DEFUN(name, arglist, args) name(args)
111#define DEFUN_VOID(name) name(void)
112
113#define PROTO(type, name, arglist) type name arglist
114#define PARAMS(paramlist) paramlist
115#define ANSI_PROTOTYPES 1
116
117#else /* Not ANSI C. */
118
119#define PTR char *
120#define PTRCONST PTR
121#define LONG_DOUBLE double
122
123#define AND ;
124#define NOARGS
125#define CONST
126#ifndef const /* some systems define it in header files for non-ansi mode */
127#define const
128#endif
129#define VOLATILE
130#define SIGNED
131#define DOTS
132
133#define EXFUN(name, proto) name()
134#define DEFUN(name, arglist, args) name arglist args;
135#define DEFUN_VOID(name) name()
136#define PROTO(type, name, arglist) type name ()
137#define PARAMS(paramlist) ()
138
139#endif /* ANSI C. */
140
141#endif /* ansidecl.h */