135 lines
3.9 KiB
C
135 lines
3.9 KiB
C
/* ANSI and traditional C compatability macros
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Copyright 1991, 1992 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
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/* ANSI and traditional C compatibility macros
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ANSI C is assumed if __STDC__ is #defined.
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Macro ANSI C definition Traditional C definition
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----- ---- - ---------- ----------- - ----------
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PTR `void *' `char *'
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LONG_DOUBLE `long double' `double'
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CONST `const' `'
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VOLATILE `volatile' `'
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SIGNED `signed' `'
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PTRCONST `void *const' `char *'
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DEFUN (name, arglist, args)
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Defines function NAME.
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ARGLIST lists the arguments, separated by commas and enclosed in
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parentheses. ARGLIST becomes the argument list in traditional C.
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ARGS list the arguments with their types. It becomes a prototype in
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ANSI C, and the type declarations in traditional C. Arguments should
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be separated with `AND'. For functions with a variable number of
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arguments, the last thing listed should be `DOTS'.
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DEFUN_VOID (name)
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Defines a function NAME, which takes no arguments.
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obsolete -- EXFUN (name, (prototype)) -- obsolete.
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Replaced by PARAMS. Do not use; will disappear someday soon.
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Was used in external function declarations.
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In ANSI C it is `NAME PROTOTYPE' (so PROTOTYPE should be enclosed in
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parentheses). In traditional C it is `NAME()'.
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For a function that takes no arguments, PROTOTYPE should be `(void)'.
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PARAMS ((args))
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We could use the EXFUN macro to handle prototype declarations, but
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the name is misleading and the result is ugly. So we just define a
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simple macro to handle the parameter lists, as in:
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static int foo PARAMS ((int, char));
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This produces: `static int foo();' or `static int foo (int, char);'
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EXFUN would have done it like this:
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static int EXFUN (foo, (int, char));
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but the function is not external...and it's hard to visually parse
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the function name out of the mess. EXFUN should be considered
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obsolete; new code should be written to use PARAMS.
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For example:
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extern int printf PARAMS ((CONST char *format DOTS));
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int DEFUN(fprintf, (stream, format),
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FILE *stream AND CONST char *format DOTS) { ... }
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void DEFUN_VOID(abort) { ... }
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*/
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#ifndef _ANSIDECL_H
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#define _ANSIDECL_H 1
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/* Every source file includes this file,
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so they will all get the switch for lint. */
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/* LINTLIBRARY */
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#if defined (__STDC__) || defined (_AIX)
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/* the AIX xlc compiler implements all these things even when it is in
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a mode which doesn't define __STDC__. */
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#define PTR void *
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#define PTRCONST void *CONST
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#define LONG_DOUBLE long double
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#define AND ,
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#define NOARGS void
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#define CONST const
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#define VOLATILE volatile
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#define SIGNED signed
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#define DOTS , ...
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#define EXFUN(name, proto) name proto
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#define DEFUN(name, arglist, args) name(args)
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#define DEFUN_VOID(name) name(void)
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#define PROTO(type, name, arglist) type name arglist
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#define PARAMS(paramlist) paramlist
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#else /* Not ANSI C. */
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#define PTR char *
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#define PTRCONST PTR
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#define LONG_DOUBLE double
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#define AND ;
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#define NOARGS
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#define CONST
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#define VOLATILE
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#define SIGNED
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#define DOTS
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#define EXFUN(name, proto) name()
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#define DEFUN(name, arglist, args) name arglist args;
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#define DEFUN_VOID(name) name()
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#define PROTO(type, name, arglist) type name ()
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#define PARAMS(paramlist) ()
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#endif /* ANSI C. */
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#endif /* ansidecl.h */
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