| 1 | /* ANSI and traditional C compatability macros |
| 2 | Copyright 1991, 1992 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., 675 Mass Ave, Cambridge, MA 02139, 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 | CONST `const' `' |
| 28 | VOLATILE `volatile' `' |
| 29 | SIGNED `signed' `' |
| 30 | PTRCONST `void *const' `char *' |
| 31 | |
| 32 | DEFUN (name, arglist, args) |
| 33 | |
| 34 | Defines function NAME. |
| 35 | |
| 36 | ARGLIST lists the arguments, separated by commas and enclosed in |
| 37 | parentheses. ARGLIST becomes the argument list in traditional C. |
| 38 | |
| 39 | ARGS list the arguments with their types. It becomes a prototype in |
| 40 | ANSI C, and the type declarations in traditional C. Arguments should |
| 41 | be separated with `AND'. For functions with a variable number of |
| 42 | arguments, the last thing listed should be `DOTS'. |
| 43 | |
| 44 | DEFUN_VOID (name) |
| 45 | |
| 46 | Defines a function NAME, which takes no arguments. |
| 47 | |
| 48 | obsolete -- EXFUN (name, (prototype)) -- obsolete. |
| 49 | |
| 50 | Replaced by PARAMS. Do not use; will disappear someday soon. |
| 51 | Was used in external function declarations. |
| 52 | In ANSI C it is `NAME PROTOTYPE' (so PROTOTYPE should be enclosed in |
| 53 | parentheses). In traditional C it is `NAME()'. |
| 54 | For a function that takes no arguments, PROTOTYPE should be `(void)'. |
| 55 | |
| 56 | PARAMS ((args)) |
| 57 | |
| 58 | We could use the EXFUN macro to handle prototype declarations, but |
| 59 | the name is misleading and the result is ugly. So we just define a |
| 60 | simple macro to handle the parameter lists, as in: |
| 61 | |
| 62 | static int foo PARAMS ((int, char)); |
| 63 | |
| 64 | This produces: `static int foo();' or `static int foo (int, char);' |
| 65 | |
| 66 | EXFUN would have done it like this: |
| 67 | |
| 68 | static int EXFUN (foo, (int, char)); |
| 69 | |
| 70 | but the function is not external...and it's hard to visually parse |
| 71 | the function name out of the mess. EXFUN should be considered |
| 72 | obsolete; new code should be written to use PARAMS. |
| 73 | |
| 74 | For example: |
| 75 | extern int printf PARAMS ((CONST char *format DOTS)); |
| 76 | int DEFUN(fprintf, (stream, format), |
| 77 | FILE *stream AND CONST char *format DOTS) { ... } |
| 78 | void DEFUN_VOID(abort) { ... } |
| 79 | */ |
| 80 | |
| 81 | #ifndef _ANSIDECL_H |
| 82 | |
| 83 | #define _ANSIDECL_H 1 |
| 84 | |
| 85 | |
| 86 | /* Every source file includes this file, |
| 87 | so they will all get the switch for lint. */ |
| 88 | /* LINTLIBRARY */ |
| 89 | |
| 90 | |
| 91 | #if defined (__STDC__) || defined (_AIX) |
| 92 | /* the AIX xlc compiler implements all these things even when it is in |
| 93 | a mode which doesn't define __STDC__. */ |
| 94 | |
| 95 | #define PTR void * |
| 96 | #define PTRCONST void *CONST |
| 97 | #define LONG_DOUBLE long double |
| 98 | |
| 99 | #define AND , |
| 100 | #define NOARGS void |
| 101 | #define CONST const |
| 102 | #define VOLATILE volatile |
| 103 | #define SIGNED signed |
| 104 | #define DOTS , ... |
| 105 | |
| 106 | #define EXFUN(name, proto) name proto |
| 107 | #define DEFUN(name, arglist, args) name(args) |
| 108 | #define DEFUN_VOID(name) name(void) |
| 109 | |
| 110 | #define PROTO(type, name, arglist) type name arglist |
| 111 | #define PARAMS(paramlist) paramlist |
| 112 | |
| 113 | #else /* Not ANSI C. */ |
| 114 | |
| 115 | #define PTR char * |
| 116 | #define PTRCONST PTR |
| 117 | #define LONG_DOUBLE double |
| 118 | |
| 119 | #define AND ; |
| 120 | #define NOARGS |
| 121 | #define CONST |
| 122 | #define VOLATILE |
| 123 | #define SIGNED |
| 124 | #define DOTS |
| 125 | |
| 126 | #define EXFUN(name, proto) name() |
| 127 | #define DEFUN(name, arglist, args) name arglist args; |
| 128 | #define DEFUN_VOID(name) name() |
| 129 | #define PROTO(type, name, arglist) type name () |
| 130 | #define PARAMS(paramlist) () |
| 131 | |
| 132 | #endif /* ANSI C. */ |
| 133 | |
| 134 | #endif /* ansidecl.h */ |