1 /* ANSI and traditional C compatability macros 2 Copyright 1991, 1992, 1996, 1999 Free Software Foundation, Inc. 3 This file is part of the GNU C Library. 4 5 This program is free software; you can redistribute it and/or modify 6 it under the terms of the GNU General Public License as published by 7 the Free Software Foundation; either version 2 of the License, or 8 (at your option) any later version. 9 10 This program is distributed in the hope that it will be useful, 11 but WITHOUT ANY WARRANTY; without even the implied warranty of 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 GNU General Public License for more details. 14 15 You should have received a copy of the GNU General Public License 16 along with this program; if not, write to the Free Software 17 Foundation, 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SIGNED `signed' `' 29 PTRCONST `void *const' `char *' 30 ANSI_PROTOTYPES 1 not defined 31 32 CONST is also defined, but is obsolete.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 obsolete -- 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 obsolete -- 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PROTOTYPE should be `(void)'. 57 58 obsolete -- PROTO (type, name, (prototype) -- obsolete. 59 60 This one has also been replaced by PARAMS. Do not use. 61 62 PARAMS ((args)) 63 64 We could use the EXFUN macro to handle prototype declarations, but 65 the name is misleading and the result is ugly. So we just define a 66 simple macro to handle the parameter lists, as in: 67 68 static int foo PARAMS ((int, char)); 69 70 This produces: `static int foo();' or `static int foo (int, char);' 71 72 EXFUN would have done it like this: 73 74 static int EXFUN (foo, (int, char)); 75 76 but the function is not external...and it's hard to visually parse 77 the function name out of the mess. EXFUN should be considered 78 obsolete; new code should be written to use PARAMS. 79 80 DOTS is also obsolete. 81 82 Examples: 83 84 extern int printf PARAMS ((const char *format, ...)); 85 */ 86 87 #ifndef _ANSIDECL_H 88 89 #define _ANSIDECL_H 1 90 91 92 /* Every source file includes this file, 93 so they will all get the switch for lint. */ 94 /* LINTLIBRARY */ 95 96 97 #if defined (__STDC__) || defined (_AIX) || (defined (__mips) && defined (_SYSTYPE_SVR4)) || defined(_WIN32) 98 /* All known AIX compilers implement these things (but don't always 99 define __STDC__). The RISC/OS MIPS compiler defines these things 100 in SVR4 mode, but does not define __STDC__. */ 101 102 #define PTR void * 103 #define PTRCONST void *CONST 104 #define LONG_DOUBLE long double 105 106 #ifndef IN_GCC 107 #define AND , 108 #define NOARGS void 109 #define VOLATILE volatile 110 #define SIGNED signed 111 #endif /* ! IN_GCC */ 112 113 #define PARAMS(paramlist) paramlist 114 #define ANSI_PROTOTYPES 1 115 116 #define VPARAMS(ARGS) ARGS 117 #define VA_START(va_list,var) va_start(va_list,var) 118 119 /* These are obsolete. Do not use. */ 120 #ifndef IN_GCC 121 #define CONST const 122 #define DOTS , ... 123 #define PROTO(type, name, arglist) type name arglist 124 #define EXFUN(name, proto) name proto 125 #define DEFUN(name, arglist, args) name(args) 126 #define DEFUN_VOID(name) name(void) 127 #endif /* ! IN_GCC */ 128 129 #else /* Not ANSI C. */ 130 131 #define PTR char * 132 #define PTRCONST PTR 133 #define LONG_DOUBLE double 134 135 #ifndef IN_GCC 136 #define AND ; 137 #define NOARGS 138 #define VOLATILE 139 #define SIGNED 140 #endif /* !IN_GCC */ 141 142 #ifndef const /* some systems define it in header files for non-ansi mode */ 143 #define const 144 #endif 145 146 #define PARAMS(paramlist) () 147 148 #define VPARAMS(ARGS) (va_alist) va_dcl 149 #define VA_START(va_list,var) va_start(va_list) 150 151 /* These are obsolete. Do not use. */ 152 #ifndef IN_GCC 153 #define CONST 154 #define DOTS 155 #define PROTO(type, name, arglist) type name () 156 #define EXFUN(name, proto) name() 157 #define DEFUN(name, arglist, args) name arglist args; 158 #define DEFUN_VOID(name) name() 159 #endif /* ! IN_GCC */ 160 161 #endif /* ANSI C. */ 162 163 /* Using MACRO(x,y) in cpp #if conditionals does not work with some 164 older preprocessors. Thus we can't define something like this: 165 166 #define HAVE_GCC_VERSION(MAJOR, MINOR) \ 167 (__GNUC__ > (MAJOR) || (__GNUC__ == (MAJOR) && __GNUC_MINOR__ >= (MINOR))) 168 169 and then test "#if HAVE_GCC_VERSION(2,7)". 170 171 So instead we use the macro below and test it against specific values. */ 172 173 /* This macro simplifies testing whether we are using gcc, and if it 174 is of a particular minimum version. (Both major & minor numbers are 175 significant.) This macro will evaluate to 0 if we are not using 176 gcc at all. */ 177 #ifndef GCC_VERSION 178 #define GCC_VERSION (__GNUC__ * 1000 + __GNUC_MINOR__) 179 #endif /* GCC_VERSION */ 180 181 /* Define macros for some gcc attributes. This permits us to use the 182 macros freely, and know that they will come into play for the 183 version of gcc in which they are supported. */ 184 185 #if (GCC_VERSION < 2007) 186 # define __attribute__(x) 187 #endif 188 189 /* Attribute __malloc__ on functions was valid as of gcc 2.96. */ 190 #ifndef ATTRIBUTE_MALLOC 191 # if (GCC_VERSION >= 2096) 192 # define ATTRIBUTE_MALLOC __attribute__ ((__malloc__)) 193 # else 194 # define ATTRIBUTE_MALLOC 195 # endif /* GNUC >= 2.96 */ 196 #endif /* ATTRIBUTE_MALLOC */ 197 198 /* Attributes on labels were valid as of gcc 2.93. */ 199 #ifndef ATTRIBUTE_UNUSED_LABEL 200 # if (GCC_VERSION >= 2093) 201 # define ATTRIBUTE_UNUSED_LABEL ATTRIBUTE_UNUSED 202 # else 203 # define ATTRIBUTE_UNUSED_LABEL 204 # endif /* GNUC >= 2.93 */ 205 #endif /* ATTRIBUTE_UNUSED_LABEL */ 206 207 #ifndef ATTRIBUTE_UNUSED 208 #define ATTRIBUTE_UNUSED __attribute__ ((__unused__)) 209 #endif /* ATTRIBUTE_UNUSED */ 210 211 #ifndef ATTRIBUTE_NORETURN 212 #define ATTRIBUTE_NORETURN __attribute__ ((__noreturn__)) 213 #endif /* ATTRIBUTE_NORETURN */ 214 215 #ifndef ATTRIBUTE_PRINTF 216 #define ATTRIBUTE_PRINTF(m, n) __attribute__ ((__format__ (__printf__, m, n))) 217 #define ATTRIBUTE_PRINTF_1 ATTRIBUTE_PRINTF(1, 2) 218 #define ATTRIBUTE_PRINTF_2 ATTRIBUTE_PRINTF(2, 3) 219 #define ATTRIBUTE_PRINTF_3 ATTRIBUTE_PRINTF(3, 4) 220 #define ATTRIBUTE_PRINTF_4 ATTRIBUTE_PRINTF(4, 5) 221 #define ATTRIBUTE_PRINTF_5 ATTRIBUTE_PRINTF(5, 6) 222 #endif /* ATTRIBUTE_PRINTF */ 223 224 #endif /* ansidecl.h */ 225