cdefs.h

Go to the documentation of this file.

/*
 * Copyright (c) 1991, 1993
 *      The Regents of the University of California.  All rights reserved.
 *
 * By using this file, you agree to the terms and conditions set
 * forth in the LICENSE file which can be found at the top level of
 * the sendmail distribution.
 *
 *      $Id$
 *      @(#)cdefs.h     8.8 (Berkeley) 1/9/95
 */

#ifndef _CDEFS_H_
# define        _CDEFS_H_

# if defined(__cplusplus)
#  define       __BEGIN_DECLS   extern "C" {
#  define       __END_DECLS     };
# else /* defined(__cplusplus) */
#  define       __BEGIN_DECLS
#  define       __END_DECLS
# endif /* defined(__cplusplus) */

/*
 * The __CONCAT macro is used to concatenate parts of symbol names, e.g.
 * with "#define OLD(foo) __CONCAT(old,foo)", OLD(foo) produces oldfoo.
 * The __CONCAT macro is a bit tricky -- make sure you don't put spaces
 * in between its arguments.  __CONCAT can also concatenate double-quoted
 * strings produced by the __STRING macro, but this only works with ANSI C.
 */
# if defined(__STDC__) || defined(__cplusplus)
#  define       __P(protos)     protos          /* full-blown ANSI C */
#  ifndef __CONCAT
#   define      __CONCAT(x,y)   x ## y
#  endif /* ! __CONCAT */
#  define       __STRING(x)     #x

#  ifndef __const
#   define      __const         const           /* define reserved names to standard */
#  endif /* ! __const */
#  define       __signed        signed
#  define       __volatile      volatile
#  if defined(__cplusplus)
#   define      __inline        inline          /* convert to C++ keyword */
#  else /* defined(__cplusplus) */
#   ifndef __GNUC__
#    define     __inline                        /* delete GCC keyword */
#   endif /* ! __GNUC__ */
#  endif /* defined(__cplusplus) */

# else /* defined(__STDC__) || defined(__cplusplus) */
#  define       __P(protos)     ()              /* traditional C preprocessor */
#  ifndef __CONCAT
#   define      __CONCAT(x,y)   x/**/y
#  endif /* ! __CONCAT */
#  define       __STRING(x)     "x"

#  ifndef __GNUC__
#   define      __const                         /* delete pseudo-ANSI C keywords */
#   define      __inline
#   define      __signed
#   define      __volatile
/*
 * In non-ANSI C environments, new programs will want ANSI-only C keywords
 * deleted from the program and old programs will want them left alone.
 * When using a compiler other than gcc, programs using the ANSI C keywords
 * const, inline etc. as normal identifiers should define -DNO_ANSI_KEYWORDS.
 * When using "gcc -traditional", we assume that this is the intent; if
 * __GNUC__ is defined but __STDC__ is not, we leave the new keywords alone.
 */
#   ifndef NO_ANSI_KEYWORDS
#    define     const                           /* delete ANSI C keywords */
#    define     inline
#    define     signed
#    define     volatile
#   endif /* ! NO_ANSI_KEYWORDS */
#  endif /* ! __GNUC__ */
# endif /* defined(__STDC__) || defined(__cplusplus) */

/*
 * GCC1 and some versions of GCC2 declare dead (non-returning) and
 * pure (no side effects) functions using "volatile" and "const";
 * unfortunately, these then cause warnings under "-ansi -pedantic".
 * GCC2 uses a new, peculiar __attribute__((attrs)) style.  All of
 * these work for GNU C++ (modulo a slight glitch in the C++ grammar
 * in the distribution version of 2.5.5).
 */
# if !defined(__GNUC__) || __GNUC__ < 2 || \
        (__GNUC__ == 2 && __GNUC_MINOR__ < 5)
#  define       __attribute__(x)        /* delete __attribute__ if non-gcc or gcc1 */
#  if defined(__GNUC__) && !defined(__STRICT_ANSI__)
#   define      __dead          __volatile
#   define      __pure          __const
#  endif /* defined(__GNUC__) && !defined(__STRICT_ANSI__) */
# endif /* !defined(__GNUC__) || __GNUC__ < 2 || \ */

/* Delete pseudo-keywords wherever they are not available or needed. */
# ifndef __dead
#  define       __dead
#  define       __pure
# endif /* ! __dead */

#endif /* ! _CDEFS_H_ */

---