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Annotation of GNUtools/libg++/include/ansidecl.h, revision 1.1

1.1     ! root        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:    VOLATILE    `volatile'              `'
        !            28:    SIGNED      `signed'                `'
        !            29:    PTRCONST    `void *const'           `char *'
        !            30: 
        !            31:    CONST is also defined, but is obsolete.  Just use const.
        !            32: 
        !            33:    DEFUN (name, arglist, args)
        !            34: 
        !            35:        Defines function NAME.
        !            36: 
        !            37:        ARGLIST lists the arguments, separated by commas and enclosed in
        !            38:        parentheses.  ARGLIST becomes the argument list in traditional C.
        !            39: 
        !            40:        ARGS list the arguments with their types.  It becomes a prototype in
        !            41:        ANSI C, and the type declarations in traditional C.  Arguments should
        !            42:        be separated with `AND'.  For functions with a variable number of
        !            43:        arguments, the last thing listed should be `DOTS'.
        !            44: 
        !            45:    DEFUN_VOID (name)
        !            46: 
        !            47:        Defines a function NAME, which takes no arguments.
        !            48: 
        !            49:    obsolete --     EXFUN (name, (prototype))   -- obsolete.
        !            50: 
        !            51:        Replaced by PARAMS.  Do not use; will disappear someday soon.
        !            52:        Was used in external function declarations.
        !            53:        In ANSI C it is `NAME PROTOTYPE' (so PROTOTYPE should be enclosed in
        !            54:        parentheses).  In traditional C it is `NAME()'.
        !            55:        For a function that takes no arguments, PROTOTYPE should be `(void)'.
        !            56: 
        !            57:     PARAMS ((args))
        !            58: 
        !            59:        We could use the EXFUN macro to handle prototype declarations, but
        !            60:        the name is misleading and the result is ugly.  So we just define a
        !            61:        simple macro to handle the parameter lists, as in:
        !            62: 
        !            63:              static int foo PARAMS ((int, char));
        !            64: 
        !            65:        This produces:  `static int foo();' or `static int foo (int, char);'
        !            66: 
        !            67:        EXFUN would have done it like this:
        !            68: 
        !            69:              static int EXFUN (foo, (int, char));
        !            70: 
        !            71:        but the function is not external...and it's hard to visually parse
        !            72:        the function name out of the mess.   EXFUN should be considered
        !            73:        obsolete; new code should be written to use PARAMS.
        !            74: 
        !            75:     For example:
        !            76:        extern int printf PARAMS ((CONST char *format DOTS));
        !            77:        int DEFUN(fprintf, (stream, format),
        !            78:                  FILE *stream AND CONST char *format DOTS) { ... }
        !            79:        void DEFUN_VOID(abort) { ... }
        !            80: */
        !            81: 
        !            82: #ifndef        _ANSIDECL_H
        !            83: 
        !            84: #define        _ANSIDECL_H     1
        !            85: 
        !            86: 
        !            87: /* Every source file includes this file,
        !            88:    so they will all get the switch for lint.  */
        !            89: /* LINTLIBRARY */
        !            90: 
        !            91: 
        !            92: #if defined (__STDC__) || defined (_AIX) || (defined (__mips) && defined (_SYSTYPE_SVR4))
        !            93: /* All known AIX compilers implement these things (but don't always
        !            94:    define __STDC__).  The RISC/OS MIPS compiler defines these things
        !            95:    in SVR4 mode, but does not define __STDC__.  */
        !            96: 
        !            97: #define        PTR             void *
        !            98: #define        PTRCONST        void *CONST
        !            99: #define        LONG_DOUBLE     long double
        !           100: 
        !           101: #define        AND             ,
        !           102: #define        NOARGS          void
        !           103: #define        CONST           const
        !           104: #define        VOLATILE        volatile
        !           105: #define        SIGNED          signed
        !           106: #define        DOTS            , ...
        !           107: 
        !           108: #define        EXFUN(name, proto)              name proto
        !           109: #define        DEFUN(name, arglist, args)      name(args)
        !           110: #define        DEFUN_VOID(name)                name(void)
        !           111: 
        !           112: #define PROTO(type, name, arglist)     type name arglist
        !           113: #define PARAMS(paramlist)              paramlist
        !           114: 
        !           115: #else  /* Not ANSI C.  */
        !           116: 
        !           117: #define        PTR             char *
        !           118: #define        PTRCONST        PTR
        !           119: #define        LONG_DOUBLE     double
        !           120: 
        !           121: #define        AND             ;
        !           122: #define        NOARGS
        !           123: #define        CONST
        !           124: #ifndef const /* some systems define it in header files for non-ansi mode */
        !           125: #define        const
        !           126: #endif
        !           127: #define        VOLATILE
        !           128: #define        SIGNED
        !           129: #define        DOTS
        !           130: 
        !           131: #define        EXFUN(name, proto)              name()
        !           132: #define        DEFUN(name, arglist, args)      name arglist args;
        !           133: #define        DEFUN_VOID(name)                name()
        !           134: #define PROTO(type, name, arglist) type name ()
        !           135: #define PARAMS(paramlist)              ()
        !           136: 
        !           137: #endif /* ANSI C.  */
        !           138: 
        !           139: #endif /* ansidecl.h   */

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