prtypes.h

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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is the Netscape Portable Runtime (NSPR).
 *
 * The Initial Developer of the Original Code is
 * Netscape Communications Corporation.
 * Portions created by the Initial Developer are Copyright (C) 1998-2000
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either the GNU General Public License Version 2 or later (the "GPL"), or
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */

/*
** File:                prtypes.h
** Description: Definitions of NSPR's basic types
**
** Prototypes and macros used to make up for deficiencies in ANSI environments
** that we have found.
**
** Since we do not wrap <stdlib.h> and all the other standard headers, authors
** of portable code will not know in general that they need these definitions.
** Instead of requiring these authors to find the dependent uses in their code
** and take the following steps only in those C files, we take steps once here
** for all C files.
**/

#ifndef prtypes_h___
#define prtypes_h___

#ifdef MDCPUCFG
#include MDCPUCFG
#else
#include "prcpucfg.h"
#endif

#include <stddef.h>

/***********************************************************************
** MACROS:      PR_EXTERN
**              PR_IMPLEMENT
** DESCRIPTION:
**      These are only for externally visible routines and globals.  For
**      internal routines, just use "extern" for type checking and that
**      will not export internal cross-file or forward-declared symbols.
**      Define a macro for declaring procedures return types. We use this to
**      deal with windoze specific type hackery for DLL definitions. Use
**      PR_EXTERN when the prototype for the method is declared. Use
**      PR_IMPLEMENT for the implementation of the method.
**
** Example:
**   in dowhim.h
**     PR_EXTERN( void ) DoWhatIMean( void );
**   in dowhim.c
**     PR_IMPLEMENT( void ) DoWhatIMean( void ) { return; }
**
**
***********************************************************************/
#if defined(WIN32)

#define PR_EXPORT(__type) extern __declspec(dllexport) __type
#define PR_EXPORT_DATA(__type) extern __declspec(dllexport) __type
#define PR_IMPORT(__type) __declspec(dllimport) __type
#define PR_IMPORT_DATA(__type) __declspec(dllimport) __type

#define PR_EXTERN(__type) extern __declspec(dllexport) __type
#define PR_IMPLEMENT(__type) __declspec(dllexport) __type
#define PR_EXTERN_DATA(__type) extern __declspec(dllexport) __type
#define PR_IMPLEMENT_DATA(__type) __declspec(dllexport) __type

#define PR_CALLBACK
#define PR_CALLBACK_DECL
#define PR_STATIC_CALLBACK(__x) static __x

#elif defined(XP_BEOS)

#define PR_EXPORT(__type) extern __declspec(dllexport) __type
#define PR_EXPORT_DATA(__type) extern __declspec(dllexport) __type
#define PR_IMPORT(__type) extern __declspec(dllexport) __type
#define PR_IMPORT_DATA(__type) extern __declspec(dllexport) __type

#define PR_EXTERN(__type) extern __declspec(dllexport) __type
#define PR_IMPLEMENT(__type) __declspec(dllexport) __type
#define PR_EXTERN_DATA(__type) extern __declspec(dllexport) __type
#define PR_IMPLEMENT_DATA(__type) __declspec(dllexport) __type

#define PR_CALLBACK
#define PR_CALLBACK_DECL
#define PR_STATIC_CALLBACK(__x) static __x

#elif defined(WIN16)

#define PR_CALLBACK_DECL        __cdecl

#if defined(_WINDLL)
#define PR_EXPORT(__type) extern __type _cdecl _export _loadds
#define PR_IMPORT(__type) extern __type _cdecl _export _loadds
#define PR_EXPORT_DATA(__type) extern __type _export
#define PR_IMPORT_DATA(__type) extern __type _export

#define PR_EXTERN(__type) extern __type _cdecl _export _loadds
#define PR_IMPLEMENT(__type) __type _cdecl _export _loadds
#define PR_EXTERN_DATA(__type) extern __type _export
#define PR_IMPLEMENT_DATA(__type) __type _export

#define PR_CALLBACK             __cdecl __loadds
#define PR_STATIC_CALLBACK(__x) static __x PR_CALLBACK

#else /* this must be .EXE */
#define PR_EXPORT(__type) extern __type _cdecl _export
#define PR_IMPORT(__type) extern __type _cdecl _export
#define PR_EXPORT_DATA(__type) extern __type _export
#define PR_IMPORT_DATA(__type) extern __type _export

#define PR_EXTERN(__type) extern __type _cdecl _export
#define PR_IMPLEMENT(__type) __type _cdecl _export
#define PR_EXTERN_DATA(__type) extern __type _export
#define PR_IMPLEMENT_DATA(__type) __type _export

#define PR_CALLBACK             __cdecl __loadds
#define PR_STATIC_CALLBACK(__x) __x PR_CALLBACK
#endif /* _WINDLL */

#elif defined(XP_MAC)

#define PR_EXPORT(__type) extern __declspec(export) __type
#define PR_EXPORT_DATA(__type) extern __declspec(export) __type
#define PR_IMPORT(__type) extern __declspec(export) __type
#define PR_IMPORT_DATA(__type) extern __declspec(export) __type

#define PR_EXTERN(__type) extern __declspec(export) __type
#define PR_IMPLEMENT(__type) __declspec(export) __type
#define PR_EXTERN_DATA(__type) extern __declspec(export) __type
#define PR_IMPLEMENT_DATA(__type) __declspec(export) __type

#define PR_CALLBACK
#define PR_CALLBACK_DECL
#define PR_STATIC_CALLBACK(__x) static __x

#elif defined(XP_OS2_VACPP) 

#define PR_EXPORT(__type) extern __type
#define PR_EXPORT_DATA(__type) extern __type
#define PR_IMPORT(__type) extern __type
#define PR_IMPORT_DATA(__type) extern __type

#define PR_EXTERN(__type) extern __type
#define PR_IMPLEMENT(__type) __type
#define PR_EXTERN_DATA(__type) extern __type
#define PR_IMPLEMENT_DATA(__type) __type
#define PR_CALLBACK _Optlink
#define PR_CALLBACK_DECL
#define PR_STATIC_CALLBACK(__x) static __x PR_CALLBACK

#else /* Unix */

#define PR_EXPORT(__type) extern __type
#define PR_EXPORT_DATA(__type) extern __type
#define PR_IMPORT(__type) extern __type
#define PR_IMPORT_DATA(__type) extern __type

#define PR_EXTERN(__type) extern __type
#define PR_IMPLEMENT(__type) __type
#define PR_EXTERN_DATA(__type) extern __type
#define PR_IMPLEMENT_DATA(__type) __type
#define PR_CALLBACK
#define PR_CALLBACK_DECL
#define PR_STATIC_CALLBACK(__x) static __x

#endif

#if defined(_NSPR_BUILD_)
#define NSPR_API(__type) PR_EXPORT(__type)
#define NSPR_DATA_API(__type) PR_EXPORT_DATA(__type)
#else
#define NSPR_API(__type) PR_IMPORT(__type)
#define NSPR_DATA_API(__type) PR_IMPORT_DATA(__type)
#endif

/***********************************************************************
** MACROS:      PR_BEGIN_MACRO
**              PR_END_MACRO
** DESCRIPTION:
**      Macro body brackets so that macros with compound statement definitions
**      behave syntactically more like functions when called.
***********************************************************************/
#define PR_BEGIN_MACRO  do {
#define PR_END_MACRO    } while (0)

/***********************************************************************
** MACROS:      PR_BEGIN_EXTERN_C
**              PR_END_EXTERN_C
** DESCRIPTION:
**      Macro shorthands for conditional C++ extern block delimiters.
***********************************************************************/
#ifdef __cplusplus
#define PR_BEGIN_EXTERN_C       extern "C" {
#define PR_END_EXTERN_C         }
#else
#define PR_BEGIN_EXTERN_C
#define PR_END_EXTERN_C
#endif

/***********************************************************************
** MACROS:      PR_BIT
**              PR_BITMASK
** DESCRIPTION:
** Bit masking macros.  XXX n must be <= 31 to be portable
***********************************************************************/
#define PR_BIT(n)       ((PRUint32)1 << (n))
#define PR_BITMASK(n)   (PR_BIT(n) - 1)

/***********************************************************************
** MACROS:      PR_ROUNDUP
**              PR_MIN
**              PR_MAX
**              PR_ABS
** DESCRIPTION:
**      Commonly used macros for operations on compatible types.
***********************************************************************/
#define PR_ROUNDUP(x,y) ((((x)+((y)-1))/(y))*(y))
#define PR_MIN(x,y)     ((x)<(y)?(x):(y))
#define PR_MAX(x,y)     ((x)>(y)?(x):(y))
#define PR_ABS(x)       ((x)<0?-(x):(x))

PR_BEGIN_EXTERN_C

/************************************************************************
** TYPES:       PRUint8
**              PRInt8
** DESCRIPTION:
**  The int8 types are known to be 8 bits each. There is no type that
**      is equivalent to a plain "char". 
************************************************************************/
#if PR_BYTES_PER_BYTE == 1
typedef unsigned char PRUint8;
/*
** Some cfront-based C++ compilers do not like 'signed char' and
** issue the warning message:
**     warning: "signed" not implemented (ignored)
** For these compilers, we have to define PRInt8 as plain 'char'.
** Make sure that plain 'char' is indeed signed under these compilers.
*/
#if (defined(HPUX) && defined(__cplusplus) \
        && !defined(__GNUC__) && __cplusplus < 199707L) \
    || (defined(SCO) && defined(__cplusplus) \
        && !defined(__GNUC__) && __cplusplus == 1L)