File: port.h

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
// Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef BASE_PORT_H_
#define BASE_PORT_H_

#include <stdarg.h>
#include "build/build_config.h"

#ifdef COMPILER_MSVC
#define GG_LONGLONG(x) x##I64
#define GG_ULONGLONG(x) x##UI64
#else
#define GG_LONGLONG(x) x##LL
#define GG_ULONGLONG(x) x##ULL
#endif

// Per C99 7.8.14, define __STDC_CONSTANT_MACROS before including <stdint.h>
// to get the INTn_C and UINTn_C macros for integer constants.  It's difficult
// to guarantee any specific ordering of header includes, so it's difficult to
// guarantee that the INTn_C macros can be defined by including <stdint.h> at
// any specific point.  Provide GG_INTn_C macros instead.

#define GG_INT8_C(x)    (x)
#define GG_INT16_C(x)   (x)
#define GG_INT32_C(x)   (x)
#define GG_INT64_C(x)   GG_LONGLONG(x)

#define GG_UINT8_C(x)   (x ## U)
#define GG_UINT16_C(x)  (x ## U)
#define GG_UINT32_C(x)  (x ## U)
#define GG_UINT64_C(x)  GG_ULONGLONG(x)

namespace base {

// It's possible for functions that use a va_list, such as StringPrintf, to
// invalidate the data in it upon use.  The fix is to make a copy of the
// structure before using it and use that copy instead.  va_copy is provided
// for this purpose.  MSVC does not provide va_copy, so define an
// implementation here.  It is not guaranteed that assignment is a copy, so the
// StringUtil.VariableArgsFunc unit test tests this capability.

// The C standard says that va_copy is a "macro", not a function.  Trying to 
// use va_list as ref args to a function, as above, breaks some machines.
#  if defined(COMPILER_GCC)
#    define base_va_copy(_a, _b) ::va_copy(_a, _b)
#  elif defined(COMPILER_MSVC)
#    define base_va_copy(_a, _b) (_a = _b)
#  else
#    error No va_copy for your compiler
#  endif

}  // namespace base

// Define an OS-neutral wrapper for shared library entry points
#if defined(OS_WIN)
#define API_CALL __stdcall
#elif defined(OS_LINUX) || defined(OS_MACOSX) || defined(OS_HURD)
#define API_CALL
#endif

#endif  // BASE_PORT_H_