424 lines
14 KiB
C
424 lines
14 KiB
C
/* ANSI and traditional C compatability macros
|
|
Copyright 1991, 1992, 1993, 1994, 1995, 1996, 1998, 1999, 2000, 2001,
|
|
2002, 2003, 2004, 2005, 2006, 2007, 2009, 2010
|
|
Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
|
|
This program is free software; you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation; either version 2 of the License, or
|
|
(at your option) any later version.
|
|
|
|
This program is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with this program; if not, write to the Free Software
|
|
Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */
|
|
|
|
/* ANSI and traditional C compatibility macros
|
|
|
|
ANSI C is assumed if __STDC__ is #defined.
|
|
|
|
Macro ANSI C definition Traditional C definition
|
|
----- ---- - ---------- ----------- - ----------
|
|
ANSI_PROTOTYPES 1 not defined
|
|
PTR `void *' `char *'
|
|
PTRCONST `void *const' `char *'
|
|
LONG_DOUBLE `long double' `double'
|
|
const not defined `'
|
|
volatile not defined `'
|
|
signed not defined `'
|
|
VA_START(ap, var) va_start(ap, var) va_start(ap)
|
|
|
|
Note that it is safe to write "void foo();" indicating a function
|
|
with no return value, in all K+R compilers we have been able to test.
|
|
|
|
For declaring functions with prototypes, we also provide these:
|
|
|
|
PARAMS ((prototype))
|
|
-- for functions which take a fixed number of arguments. Use this
|
|
when declaring the function. When defining the function, write a
|
|
K+R style argument list. For example:
|
|
|
|
char *strcpy PARAMS ((char *dest, char *source));
|
|
...
|
|
char *
|
|
strcpy (dest, source)
|
|
char *dest;
|
|
char *source;
|
|
{ ... }
|
|
|
|
|
|
VPARAMS ((prototype, ...))
|
|
-- for functions which take a variable number of arguments. Use
|
|
PARAMS to declare the function, VPARAMS to define it. For example:
|
|
|
|
int printf PARAMS ((const char *format, ...));
|
|
...
|
|
int
|
|
printf VPARAMS ((const char *format, ...))
|
|
{
|
|
...
|
|
}
|
|
|
|
For writing functions which take variable numbers of arguments, we
|
|
also provide the VA_OPEN, VA_CLOSE, and VA_FIXEDARG macros. These
|
|
hide the differences between K+R <varargs.h> and C89 <stdarg.h> more
|
|
thoroughly than the simple VA_START() macro mentioned above.
|
|
|
|
VA_OPEN and VA_CLOSE are used *instead of* va_start and va_end.
|
|
Immediately after VA_OPEN, put a sequence of VA_FIXEDARG calls
|
|
corresponding to the list of fixed arguments. Then use va_arg
|
|
normally to get the variable arguments, or pass your va_list object
|
|
around. You do not declare the va_list yourself; VA_OPEN does it
|
|
for you.
|
|
|
|
Here is a complete example:
|
|
|
|
int
|
|
printf VPARAMS ((const char *format, ...))
|
|
{
|
|
int result;
|
|
|
|
VA_OPEN (ap, format);
|
|
VA_FIXEDARG (ap, const char *, format);
|
|
|
|
result = vfprintf (stdout, format, ap);
|
|
VA_CLOSE (ap);
|
|
|
|
return result;
|
|
}
|
|
|
|
|
|
You can declare variables either before or after the VA_OPEN,
|
|
VA_FIXEDARG sequence. Also, VA_OPEN and VA_CLOSE are the beginning
|
|
and end of a block. They must appear at the same nesting level,
|
|
and any variables declared after VA_OPEN go out of scope at
|
|
VA_CLOSE. Unfortunately, with a K+R compiler, that includes the
|
|
argument list. You can have multiple instances of VA_OPEN/VA_CLOSE
|
|
pairs in a single function in case you need to traverse the
|
|
argument list more than once.
|
|
|
|
For ease of writing code which uses GCC extensions but needs to be
|
|
portable to other compilers, we provide the GCC_VERSION macro that
|
|
simplifies testing __GNUC__ and __GNUC_MINOR__ together, and various
|
|
wrappers around __attribute__. Also, __extension__ will be #defined
|
|
to nothing if it doesn't work. See below.
|
|
|
|
This header also defines a lot of obsolete macros:
|
|
CONST, VOLATILE, SIGNED, PROTO, EXFUN, DEFUN, DEFUN_VOID,
|
|
AND, DOTS, NOARGS. Don't use them. */
|
|
|
|
#ifndef _ANSIDECL_H
|
|
#define _ANSIDECL_H 1
|
|
|
|
#ifdef __cplusplus
|
|
extern "C" {
|
|
#endif
|
|
|
|
/* Every source file includes this file,
|
|
so they will all get the switch for lint. */
|
|
/* LINTLIBRARY */
|
|
|
|
/* Using MACRO(x,y) in cpp #if conditionals does not work with some
|
|
older preprocessors. Thus we can't define something like this:
|
|
|
|
#define HAVE_GCC_VERSION(MAJOR, MINOR) \
|
|
(__GNUC__ > (MAJOR) || (__GNUC__ == (MAJOR) && __GNUC_MINOR__ >= (MINOR)))
|
|
|
|
and then test "#if HAVE_GCC_VERSION(2,7)".
|
|
|
|
So instead we use the macro below and test it against specific values. */
|
|
|
|
/* This macro simplifies testing whether we are using gcc, and if it
|
|
is of a particular minimum version. (Both major & minor numbers are
|
|
significant.) This macro will evaluate to 0 if we are not using
|
|
gcc at all. */
|
|
#ifndef GCC_VERSION
|
|
#define GCC_VERSION (__GNUC__ * 1000 + __GNUC_MINOR__)
|
|
#endif /* GCC_VERSION */
|
|
|
|
#if defined (__STDC__) || defined(__cplusplus) || defined (_AIX) || (defined (__mips) && defined (_SYSTYPE_SVR4)) || defined(_WIN32)
|
|
/* All known AIX compilers implement these things (but don't always
|
|
define __STDC__). The RISC/OS MIPS compiler defines these things
|
|
in SVR4 mode, but does not define __STDC__. */
|
|
/* eraxxon@alumni.rice.edu: The Compaq C++ compiler, unlike many other
|
|
C++ compilers, does not define __STDC__, though it acts as if this
|
|
was so. (Verified versions: 5.7, 6.2, 6.3, 6.5) */
|
|
|
|
#define ANSI_PROTOTYPES 1
|
|
#define PTR void *
|
|
#define PTRCONST void *const
|
|
#define LONG_DOUBLE long double
|
|
|
|
/* PARAMS is often defined elsewhere (e.g. by libintl.h), so wrap it in
|
|
a #ifndef. */
|
|
#ifndef PARAMS
|
|
#define PARAMS(ARGS) ARGS
|
|
#endif
|
|
|
|
#define VPARAMS(ARGS) ARGS
|
|
#define VA_START(VA_LIST, VAR) va_start(VA_LIST, VAR)
|
|
|
|
/* variadic function helper macros */
|
|
/* "struct Qdmy" swallows the semicolon after VA_OPEN/VA_FIXEDARG's
|
|
use without inhibiting further decls and without declaring an
|
|
actual variable. */
|
|
#define VA_OPEN(AP, VAR) { va_list AP; va_start(AP, VAR); { struct Qdmy
|
|
#define VA_CLOSE(AP) } va_end(AP); }
|
|
#define VA_FIXEDARG(AP, T, N) struct Qdmy
|
|
|
|
#undef const
|
|
#undef volatile
|
|
#undef signed
|
|
|
|
/* inline requires special treatment; it's in C99, and GCC >=2.7 supports
|
|
it too, but it's not in C89. */
|
|
#undef inline
|
|
#if __STDC_VERSION__ >= 199901L || defined(__cplusplus) || (defined(__SUNPRO_C) && defined(__C99FEATURES__))
|
|
/* it's a keyword */
|
|
#else
|
|
# if GCC_VERSION >= 2007
|
|
# define inline __inline__ /* __inline__ prevents -pedantic warnings */
|
|
# else
|
|
# define inline /* nothing */
|
|
# endif
|
|
#endif
|
|
|
|
/* These are obsolete. Do not use. */
|
|
#ifndef IN_GCC
|
|
#define CONST const
|
|
#define VOLATILE volatile
|
|
#define SIGNED signed
|
|
|
|
#define PROTO(type, name, arglist) type name arglist
|
|
#define EXFUN(name, proto) name proto
|
|
#define DEFUN(name, arglist, args) name(args)
|
|
#define DEFUN_VOID(name) name(void)
|
|
#define AND ,
|
|
#define DOTS , ...
|
|
#define NOARGS void
|
|
#endif /* ! IN_GCC */
|
|
|
|
#else /* Not ANSI C. */
|
|
|
|
#undef ANSI_PROTOTYPES
|
|
#define PTR char *
|
|
#define PTRCONST PTR
|
|
#define LONG_DOUBLE double
|
|
|
|
#define PARAMS(args) ()
|
|
#define VPARAMS(args) (va_alist) va_dcl
|
|
#define VA_START(va_list, var) va_start(va_list)
|
|
|
|
#define VA_OPEN(AP, VAR) { va_list AP; va_start(AP); { struct Qdmy
|
|
#define VA_CLOSE(AP) } va_end(AP); }
|
|
#define VA_FIXEDARG(AP, TYPE, NAME) TYPE NAME = va_arg(AP, TYPE)
|
|
|
|
/* some systems define these in header files for non-ansi mode */
|
|
#undef const
|
|
#undef volatile
|
|
#undef signed
|
|
#undef inline
|
|
#define const
|
|
#define volatile
|
|
#define signed
|
|
#define inline
|
|
|
|
#ifndef IN_GCC
|
|
#define CONST
|
|
#define VOLATILE
|
|
#define SIGNED
|
|
|
|
#define PROTO(type, name, arglist) type name ()
|
|
#define EXFUN(name, proto) name()
|
|
#define DEFUN(name, arglist, args) name arglist args;
|
|
#define DEFUN_VOID(name) name()
|
|
#define AND ;
|
|
#define DOTS
|
|
#define NOARGS
|
|
#endif /* ! IN_GCC */
|
|
|
|
#endif /* ANSI C. */
|
|
|
|
/* Define macros for some gcc attributes. This permits us to use the
|
|
macros freely, and know that they will come into play for the
|
|
version of gcc in which they are supported. */
|
|
|
|
#if (GCC_VERSION < 2007)
|
|
# define __attribute__(x)
|
|
#endif
|
|
|
|
/* Attribute __malloc__ on functions was valid as of gcc 2.96. */
|
|
#ifndef ATTRIBUTE_MALLOC
|
|
# if (GCC_VERSION >= 2096)
|
|
# define ATTRIBUTE_MALLOC __attribute__ ((__malloc__))
|
|
# else
|
|
# define ATTRIBUTE_MALLOC
|
|
# endif /* GNUC >= 2.96 */
|
|
#endif /* ATTRIBUTE_MALLOC */
|
|
|
|
/* Attributes on labels were valid as of gcc 2.93 and g++ 4.5. For
|
|
g++ an attribute on a label must be followed by a semicolon. */
|
|
#ifndef ATTRIBUTE_UNUSED_LABEL
|
|
# ifndef __cplusplus
|
|
# if GCC_VERSION >= 2093
|
|
# define ATTRIBUTE_UNUSED_LABEL ATTRIBUTE_UNUSED
|
|
# else
|
|
# define ATTRIBUTE_UNUSED_LABEL
|
|
# endif
|
|
# else
|
|
# if GCC_VERSION >= 4005
|
|
# define ATTRIBUTE_UNUSED_LABEL ATTRIBUTE_UNUSED ;
|
|
# else
|
|
# define ATTRIBUTE_UNUSED_LABEL
|
|
# endif
|
|
# endif
|
|
#endif
|
|
|
|
#ifndef ATTRIBUTE_UNUSED
|
|
#define ATTRIBUTE_UNUSED __attribute__ ((__unused__))
|
|
#endif /* ATTRIBUTE_UNUSED */
|
|
|
|
/* Before GCC 3.4, the C++ frontend couldn't parse attributes placed after the
|
|
identifier name. */
|
|
#if ! defined(__cplusplus) || (GCC_VERSION >= 3004)
|
|
# define ARG_UNUSED(NAME) NAME ATTRIBUTE_UNUSED
|
|
#else /* !__cplusplus || GNUC >= 3.4 */
|
|
# define ARG_UNUSED(NAME) NAME
|
|
#endif /* !__cplusplus || GNUC >= 3.4 */
|
|
|
|
#ifndef ATTRIBUTE_NORETURN
|
|
#define ATTRIBUTE_NORETURN __attribute__ ((__noreturn__))
|
|
#endif /* ATTRIBUTE_NORETURN */
|
|
|
|
/* Attribute `nonnull' was valid as of gcc 3.3. */
|
|
#ifndef ATTRIBUTE_NONNULL
|
|
# if (GCC_VERSION >= 3003)
|
|
# define ATTRIBUTE_NONNULL(m) __attribute__ ((__nonnull__ (m)))
|
|
# else
|
|
# define ATTRIBUTE_NONNULL(m)
|
|
# endif /* GNUC >= 3.3 */
|
|
#endif /* ATTRIBUTE_NONNULL */
|
|
|
|
/* Attribute `pure' was valid as of gcc 3.0. */
|
|
#ifndef ATTRIBUTE_PURE
|
|
# if (GCC_VERSION >= 3000)
|
|
# define ATTRIBUTE_PURE __attribute__ ((__pure__))
|
|
# else
|
|
# define ATTRIBUTE_PURE
|
|
# endif /* GNUC >= 3.0 */
|
|
#endif /* ATTRIBUTE_PURE */
|
|
|
|
/* Use ATTRIBUTE_PRINTF when the format specifier must not be NULL.
|
|
This was the case for the `printf' format attribute by itself
|
|
before GCC 3.3, but as of 3.3 we need to add the `nonnull'
|
|
attribute to retain this behavior. */
|
|
#ifndef ATTRIBUTE_PRINTF
|
|
#define ATTRIBUTE_PRINTF(m, n) __attribute__ ((__format__ (__printf__, m, n))) ATTRIBUTE_NONNULL(m)
|
|
#define ATTRIBUTE_PRINTF_1 ATTRIBUTE_PRINTF(1, 2)
|
|
#define ATTRIBUTE_PRINTF_2 ATTRIBUTE_PRINTF(2, 3)
|
|
#define ATTRIBUTE_PRINTF_3 ATTRIBUTE_PRINTF(3, 4)
|
|
#define ATTRIBUTE_PRINTF_4 ATTRIBUTE_PRINTF(4, 5)
|
|
#define ATTRIBUTE_PRINTF_5 ATTRIBUTE_PRINTF(5, 6)
|
|
#endif /* ATTRIBUTE_PRINTF */
|
|
|
|
/* Use ATTRIBUTE_FPTR_PRINTF when the format attribute is to be set on
|
|
a function pointer. Format attributes were allowed on function
|
|
pointers as of gcc 3.1. */
|
|
#ifndef ATTRIBUTE_FPTR_PRINTF
|
|
# if (GCC_VERSION >= 3001)
|
|
# define ATTRIBUTE_FPTR_PRINTF(m, n) ATTRIBUTE_PRINTF(m, n)
|
|
# else
|
|
# define ATTRIBUTE_FPTR_PRINTF(m, n)
|
|
# endif /* GNUC >= 3.1 */
|
|
# define ATTRIBUTE_FPTR_PRINTF_1 ATTRIBUTE_FPTR_PRINTF(1, 2)
|
|
# define ATTRIBUTE_FPTR_PRINTF_2 ATTRIBUTE_FPTR_PRINTF(2, 3)
|
|
# define ATTRIBUTE_FPTR_PRINTF_3 ATTRIBUTE_FPTR_PRINTF(3, 4)
|
|
# define ATTRIBUTE_FPTR_PRINTF_4 ATTRIBUTE_FPTR_PRINTF(4, 5)
|
|
# define ATTRIBUTE_FPTR_PRINTF_5 ATTRIBUTE_FPTR_PRINTF(5, 6)
|
|
#endif /* ATTRIBUTE_FPTR_PRINTF */
|
|
|
|
/* Use ATTRIBUTE_NULL_PRINTF when the format specifier may be NULL. A
|
|
NULL format specifier was allowed as of gcc 3.3. */
|
|
#ifndef ATTRIBUTE_NULL_PRINTF
|
|
# if (GCC_VERSION >= 3003)
|
|
# define ATTRIBUTE_NULL_PRINTF(m, n) __attribute__ ((__format__ (__printf__, m, n)))
|
|
# else
|
|
# define ATTRIBUTE_NULL_PRINTF(m, n)
|
|
# endif /* GNUC >= 3.3 */
|
|
# define ATTRIBUTE_NULL_PRINTF_1 ATTRIBUTE_NULL_PRINTF(1, 2)
|
|
# define ATTRIBUTE_NULL_PRINTF_2 ATTRIBUTE_NULL_PRINTF(2, 3)
|
|
# define ATTRIBUTE_NULL_PRINTF_3 ATTRIBUTE_NULL_PRINTF(3, 4)
|
|
# define ATTRIBUTE_NULL_PRINTF_4 ATTRIBUTE_NULL_PRINTF(4, 5)
|
|
# define ATTRIBUTE_NULL_PRINTF_5 ATTRIBUTE_NULL_PRINTF(5, 6)
|
|
#endif /* ATTRIBUTE_NULL_PRINTF */
|
|
|
|
/* Attribute `sentinel' was valid as of gcc 3.5. */
|
|
#ifndef ATTRIBUTE_SENTINEL
|
|
# if (GCC_VERSION >= 3005)
|
|
# define ATTRIBUTE_SENTINEL __attribute__ ((__sentinel__))
|
|
# else
|
|
# define ATTRIBUTE_SENTINEL
|
|
# endif /* GNUC >= 3.5 */
|
|
#endif /* ATTRIBUTE_SENTINEL */
|
|
|
|
|
|
#ifndef ATTRIBUTE_ALIGNED_ALIGNOF
|
|
# if (GCC_VERSION >= 3000)
|
|
# define ATTRIBUTE_ALIGNED_ALIGNOF(m) __attribute__ ((__aligned__ (__alignof__ (m))))
|
|
# else
|
|
# define ATTRIBUTE_ALIGNED_ALIGNOF(m)
|
|
# endif /* GNUC >= 3.0 */
|
|
#endif /* ATTRIBUTE_ALIGNED_ALIGNOF */
|
|
|
|
/* Useful for structures whose layout must much some binary specification
|
|
regardless of the alignment and padding qualities of the compiler. */
|
|
#ifndef ATTRIBUTE_PACKED
|
|
# define ATTRIBUTE_PACKED __attribute__ ((packed))
|
|
#endif
|
|
|
|
/* Attribute `hot' and `cold' was valid as of gcc 4.3. */
|
|
#ifndef ATTRIBUTE_COLD
|
|
# if (GCC_VERSION >= 4003)
|
|
# define ATTRIBUTE_COLD __attribute__ ((__cold__))
|
|
# else
|
|
# define ATTRIBUTE_COLD
|
|
# endif /* GNUC >= 4.3 */
|
|
#endif /* ATTRIBUTE_COLD */
|
|
#ifndef ATTRIBUTE_HOT
|
|
# if (GCC_VERSION >= 4003)
|
|
# define ATTRIBUTE_HOT __attribute__ ((__hot__))
|
|
# else
|
|
# define ATTRIBUTE_HOT
|
|
# endif /* GNUC >= 4.3 */
|
|
#endif /* ATTRIBUTE_HOT */
|
|
|
|
/* We use __extension__ in some places to suppress -pedantic warnings
|
|
about GCC extensions. This feature didn't work properly before
|
|
gcc 2.8. */
|
|
#if GCC_VERSION < 2008
|
|
#define __extension__
|
|
#endif
|
|
|
|
/* This is used to declare a const variable which should be visible
|
|
outside of the current compilation unit. Use it as
|
|
EXPORTED_CONST int i = 1;
|
|
This is because the semantics of const are different in C and C++.
|
|
"extern const" is permitted in C but it looks strange, and gcc
|
|
warns about it when -Wc++-compat is not used. */
|
|
#ifdef __cplusplus
|
|
#define EXPORTED_CONST extern const
|
|
#else
|
|
#define EXPORTED_CONST const
|
|
#endif
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
#endif /* ansidecl.h */
|