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1 /* ANSI and traditional C compatability macros
2 Copyright 1991, 1992, 1993, 1994, 1995, 1996, 1998, 1999, 2000, 2001
3 Free Software Foundation, Inc.
4 This file is part of the GNU C Library.
5
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
10
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
15
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
19
20 /* ANSI and traditional C compatibility macros
21
22 ANSI C is assumed if __STDC__ is #defined.
23
24 Macro ANSI C definition Traditional C definition
25 ----- ---- - ---------- ----------- - ----------
26 ANSI_PROTOTYPES 1 not defined
27 PTR `void *' `char *'
28 PTRCONST `void *const' `char *'
29 LONG_DOUBLE `long double' `double'
30 const not defined `'
31 volatile not defined `'
32 signed not defined `'
33 VA_START(ap, var) va_start(ap, var) va_start(ap)
34
35 Note that it is safe to write "void foo();" indicating a function
36 with no return value, in all K+R compilers we have been able to test.
37
38 For declaring functions with prototypes, we also provide these:
39
40 PARAMS ((prototype))
41 -- for functions which take a fixed number of arguments. Use this
42 when declaring the function. When defining the function, write a
43 K+R style argument list. For example:
44
45 char *strcpy PARAMS ((char *dest, char *source));
46 ...
47 char *
48 strcpy (dest, source)
49 char *dest;
50 char *source;
51 { ... }
52
53
54 VPARAMS ((prototype, ...))
55 -- for functions which take a variable number of arguments. Use
56 PARAMS to declare the function, VPARAMS to define it. For example:
57
58 int printf PARAMS ((const char *format, ...));
59 ...
60 int
61 printf VPARAMS ((const char *format, ...))
62 {
63 ...
64 }
65
66 For writing functions which take variable numbers of arguments, we
67 also provide the VA_OPEN, VA_CLOSE, and VA_FIXEDARG macros. These
68 hide the differences between K+R <varargs.h> and C89 <stdarg.h> more
69 thoroughly than the simple VA_START() macro mentioned above.
70
71 VA_OPEN and VA_CLOSE are used *instead of* va_start and va_end.
72 Immediately after VA_OPEN, put a sequence of VA_FIXEDARG calls
73 corresponding to the list of fixed arguments. Then use va_arg
74 normally to get the variable arguments, or pass your va_list object
75 around. You do not declare the va_list yourself; VA_OPEN does it
76 for you.
77
78 Here is a complete example:
79
80 int
81 printf VPARAMS ((const char *format, ...))
82 {
83 int result;
84
85 VA_OPEN (ap, format);
86 VA_FIXEDARG (ap, const char *, format);
87
88 result = vfprintf (stdout, format, ap);
89 VA_CLOSE (ap);
90
91 return result;
92 }
93
94
95 You can declare variables either before or after the VA_OPEN,
96 VA_FIXEDARG sequence. Also, VA_OPEN and VA_CLOSE are the beginning
97 and end of a block. They must appear at the same nesting level,
98 and any variables declared after VA_OPEN go out of scope at
99 VA_CLOSE. Unfortunately, with a K+R compiler, that includes the
100 argument list. You can have multiple instances of VA_OPEN/VA_CLOSE
101 pairs in a single function in case you need to traverse the
102 argument list more than once.
103
104 For ease of writing code which uses GCC extensions but needs to be
105 portable to other compilers, we provide the GCC_VERSION macro that
106 simplifies testing __GNUC__ and __GNUC_MINOR__ together, and various
107 wrappers around __attribute__. Also, __extension__ will be #defined
108 to nothing if it doesn't work. See below.
109
110 This header also defines a lot of obsolete macros:
111 CONST, VOLATILE, SIGNED, PROTO, EXFUN, DEFUN, DEFUN_VOID,
112 AND, DOTS, NOARGS. Don't use them. */
113
114 #ifndef _ANSIDECL_H
115 #define _ANSIDECL_H 1
116
117 /* Every source file includes this file,
118 so they will all get the switch for lint. */
119 /* LINTLIBRARY */
120
121 /* Using MACRO(x,y) in cpp #if conditionals does not work with some
122 older preprocessors. Thus we can't define something like this:
123
124 #define HAVE_GCC_VERSION(MAJOR, MINOR) \
125 (__GNUC__ > (MAJOR) || (__GNUC__ == (MAJOR) && __GNUC_MINOR__ >= (MINOR)))
126
127 and then test "#if HAVE_GCC_VERSION(2,7)".
128
129 So instead we use the macro below and test it against specific values. */
130
131 /* This macro simplifies testing whether we are using gcc, and if it
132 is of a particular minimum version. (Both major & minor numbers are
133 significant.) This macro will evaluate to 0 if we are not using
134 gcc at all. */
135 #ifndef GCC_VERSION
136 #define GCC_VERSION (__GNUC__ * 1000 + __GNUC_MINOR__)
137 #endif /* GCC_VERSION */
138
139 #if defined (__STDC__) || defined (_AIX) || (defined (__mips) && defined (_SYSTYPE_SVR4)) || defined(_WIN32) || (defined(__alpha) && defined(__cplusplus))
140 /* All known AIX compilers implement these things (but don't always
141 define __STDC__). The RISC/OS MIPS compiler defines these things
142 in SVR4 mode, but does not define __STDC__. */
143 /* eraxxon@alumni.rice.edu: The Compaq C++ compiler, unlike many other
144 C++ compilers, does not define __STDC__, though it acts as if this
145 was so. (Verified versions: 5.7, 6.2, 6.3, 6.5) */
146
147 #define ANSI_PROTOTYPES 1
148 #define PTR void *
149 #define PTRCONST void *const
150 #define LONG_DOUBLE long double
151
152 #define PARAMS(ARGS) ARGS
153 #define VPARAMS(ARGS) ARGS
154 #define VA_START(VA_LIST, VAR) va_start(VA_LIST, VAR)
155
156 /* variadic function helper macros */
157 /* "struct Qdmy" swallows the semicolon after VA_OPEN/VA_FIXEDARG's
158 use without inhibiting further decls and without declaring an
159 actual variable. */
160 #define VA_OPEN(AP, VAR) { va_list AP; va_start(AP, VAR); { struct Qdmy
161 #define VA_CLOSE(AP) } va_end(AP); }
162 #define VA_FIXEDARG(AP, T, N) struct Qdmy
163
164 #undef const
165 #undef volatile
166 #undef signed
167
168 /* inline requires special treatment; it's in C99, and GCC >=2.7 supports
169 it too, but it's not in C89. */
170 #undef inline
171 #if __STDC_VERSION__ > 199901L
172 /* it's a keyword */
173 #else
174 # if GCC_VERSION >= 2007
175 # define inline __inline__ /* __inline__ prevents -pedantic warnings */
176 # else
177 # define inline /* nothing */
178 # endif
179 #endif
180
181 /* These are obsolete. Do not use. */
182 #ifndef IN_GCC
183 #define CONST const
184 #define VOLATILE volatile
185 #define SIGNED signed
186
187 #define PROTO(type, name, arglist) type name arglist
188 #define EXFUN(name, proto) name proto
189 #define DEFUN(name, arglist, args) name(args)
190 #define DEFUN_VOID(name) name(void)
191 #define AND ,
192 #define DOTS , ...
193 #define NOARGS void
194 #endif /* ! IN_GCC */
195
196 #else /* Not ANSI C. */
197
198 #undef ANSI_PROTOTYPES
199 #define PTR char *
200 #define PTRCONST PTR
201 #define LONG_DOUBLE double
202
203 #define PARAMS(args) ()
204 #define VPARAMS(args) (va_alist) va_dcl
205 #define VA_START(va_list, var) va_start(va_list)
206
207 #define VA_OPEN(AP, VAR) { va_list AP; va_start(AP); { struct Qdmy
208 #define VA_CLOSE(AP) } va_end(AP); }
209 #define VA_FIXEDARG(AP, TYPE, NAME) TYPE NAME = va_arg(AP, TYPE)
210
211 /* some systems define these in header files for non-ansi mode */
212 #undef const
213 #undef volatile
214 #undef signed
215 #undef inline
216 #define const
217 #define volatile
218 #define signed
219 #define inline
220
221 #ifndef IN_GCC
222 #define CONST
223 #define VOLATILE
224 #define SIGNED
225
226 #define PROTO(type, name, arglist) type name ()
227 #define EXFUN(name, proto) name()
228 #define DEFUN(name, arglist, args) name arglist args;
229 #define DEFUN_VOID(name) name()
230 #define AND ;
231 #define DOTS
232 #define NOARGS
233 #endif /* ! IN_GCC */
234
235 #endif /* ANSI C. */
236
237 /* Define macros for some gcc attributes. This permits us to use the
238 macros freely, and know that they will come into play for the
239 version of gcc in which they are supported. */
240
241 #if (GCC_VERSION < 2007)
242 # define __attribute__(x)
243 #endif
244
245 /* Attribute __malloc__ on functions was valid as of gcc 2.96. */
246 #ifndef ATTRIBUTE_MALLOC
247 # if (GCC_VERSION >= 2096)
248 # define ATTRIBUTE_MALLOC __attribute__ ((__malloc__))
249 # else
250 # define ATTRIBUTE_MALLOC
251 # endif /* GNUC >= 2.96 */
252 #endif /* ATTRIBUTE_MALLOC */
253
254 /* Attributes on labels were valid as of gcc 2.93. */
255 #ifndef ATTRIBUTE_UNUSED_LABEL
256 # if (GCC_VERSION >= 2093)
257 # define ATTRIBUTE_UNUSED_LABEL ATTRIBUTE_UNUSED
258 # else
259 # define ATTRIBUTE_UNUSED_LABEL
260 # endif /* GNUC >= 2.93 */
261 #endif /* ATTRIBUTE_UNUSED_LABEL */
262
263 #ifndef ATTRIBUTE_UNUSED
264 #define ATTRIBUTE_UNUSED __attribute__ ((__unused__))
265 #endif /* ATTRIBUTE_UNUSED */
266
267 #ifndef ATTRIBUTE_NORETURN
268 #define ATTRIBUTE_NORETURN __attribute__ ((__noreturn__))
269 #endif /* ATTRIBUTE_NORETURN */
270
271 /* Attribute `nonnull' was valid as of gcc 3.3. */
272 #ifndef ATTRIBUTE_NONNULL
273 # if (GCC_VERSION >= 3003)
274 # define ATTRIBUTE_NONNULL(m) __attribute__ ((__nonnull__ (m)))
275 # else
276 # define ATTRIBUTE_NONNULL(m)
277 # endif /* GNUC >= 3.3 */
278 #endif /* ATTRIBUTE_NONNULL */
279
280 /* Use ATTRIBUTE_PRINTF when the format specifier must not be NULL.
281 This was the case for the `printf' format attribute by itself
282 before GCC 3.3, but as of 3.3 we need to add the `nonnull'
283 attribute to retain this behavior. */
284 #ifndef ATTRIBUTE_PRINTF
285 #define ATTRIBUTE_PRINTF(m, n) __attribute__ ((__format__ (__printf__, m, n))) ATTRIBUTE_NONNULL(m)
286 #define ATTRIBUTE_PRINTF_1 ATTRIBUTE_PRINTF(1, 2)
287 #define ATTRIBUTE_PRINTF_2 ATTRIBUTE_PRINTF(2, 3)
288 #define ATTRIBUTE_PRINTF_3 ATTRIBUTE_PRINTF(3, 4)
289 #define ATTRIBUTE_PRINTF_4 ATTRIBUTE_PRINTF(4, 5)
290 #define ATTRIBUTE_PRINTF_5 ATTRIBUTE_PRINTF(5, 6)
291 #endif /* ATTRIBUTE_PRINTF */
292
293 /* Use ATTRIBUTE_NULL_PRINTF when the format specifier may be NULL. A
294 NULL format specifier was allowed as of gcc 3.3. */
295 #ifndef ATTRIBUTE_NULL_PRINTF
296 # if (GCC_VERSION >= 3003)
297 # define ATTRIBUTE_NULL_PRINTF(m, n) __attribute__ ((__format__ (__printf__, m, n)))
298 # else
299 # define ATTRIBUTE_NULL_PRINTF(m, n)
300 # endif /* GNUC >= 3.3 */
301 # define ATTRIBUTE_NULL_PRINTF_1 ATTRIBUTE_NULL_PRINTF(1, 2)
302 # define ATTRIBUTE_NULL_PRINTF_2 ATTRIBUTE_NULL_PRINTF(2, 3)
303 # define ATTRIBUTE_NULL_PRINTF_3 ATTRIBUTE_NULL_PRINTF(3, 4)
304 # define ATTRIBUTE_NULL_PRINTF_4 ATTRIBUTE_NULL_PRINTF(4, 5)
305 # define ATTRIBUTE_NULL_PRINTF_5 ATTRIBUTE_NULL_PRINTF(5, 6)
306 #endif /* ATTRIBUTE_NULL_PRINTF */
307
308 /* We use __extension__ in some places to suppress -pedantic warnings
309 about GCC extensions. This feature didn't work properly before
310 gcc 2.8. */
311 #if GCC_VERSION < 2008
312 #define __extension__
313 #endif
314
315 #endif /* ansidecl.h */