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32   CONST is also defined, but is obsolete.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)) \
94	|| defined(WIN32)
95/* All known AIX compilers implement these things (but don't always
96   define __STDC__).  The RISC/OS MIPS compiler defines these things
97   in SVR4 mode, but does not define __STDC__.  */
98
99#define	PTR		void *
100#define	PTRCONST	void *CONST
101#define	LONG_DOUBLE	long double
102
103#define	AND		,
104#define	NOARGS		void
105#define	CONST		const
106#define	VOLATILE	volatile
107#define	SIGNED		signed
108#define	DOTS		, ...
109
110#define	EXFUN(name, proto)		name proto
111#define	DEFUN(name, arglist, args)	name(args)
112#define	DEFUN_VOID(name)		name(void)
113
114#define PROTO(type, name, arglist)	type name arglist
115#define PARAMS(paramlist)		paramlist
116#define ANSI_PROTOTYPES			1
117
118#else	/* Not ANSI C.  */
119
120#define	PTR		char *
121#define	PTRCONST	PTR
122#define	LONG_DOUBLE	double
123
124#define	AND		;
125#define	NOARGS
126#define	CONST
127#ifndef const     /* some systems define it in header files for non-ansi mode */
128#define	const
129#endif
130#define	VOLATILE
131#define	SIGNED
132#define	DOTS
133
134#define	EXFUN(name, proto)		name()
135#define	DEFUN(name, arglist, args)	name arglist args;
136#define	DEFUN_VOID(name)		name()
137#define PROTO(type, name, arglist) type name ()
138#define PARAMS(paramlist)		()
139
140#endif	/* ANSI C.  */
141
142#endif	/* ansidecl.h	*/
143