port.h revision 3345a6884c488ff3a535c2c9acdd33d74b37e311 
1// Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#ifndef BASE_PORT_H_
6#define BASE_PORT_H_
7#pragma once
8
9#include <stdarg.h>
10#include "build/build_config.h"
11
12#ifdef COMPILER_MSVC
13#define GG_LONGLONG(x) x##I64
14#define GG_ULONGLONG(x) x##UI64
15#else
16#define GG_LONGLONG(x) x##LL
17#define GG_ULONGLONG(x) x##ULL
18#endif
19
20// Per C99 7.8.14, define __STDC_CONSTANT_MACROS before including <stdint.h>
21// to get the INTn_C and UINTn_C macros for integer constants.  It's difficult
22// to guarantee any specific ordering of header includes, so it's difficult to
23// guarantee that the INTn_C macros can be defined by including <stdint.h> at
24// any specific point.  Provide GG_INTn_C macros instead.
25
26#define GG_INT8_C(x)    (x)
27#define GG_INT16_C(x)   (x)
28#define GG_INT32_C(x)   (x)
29#define GG_INT64_C(x)   GG_LONGLONG(x)
30
31#define GG_UINT8_C(x)   (x ## U)
32#define GG_UINT16_C(x)  (x ## U)
33#define GG_UINT32_C(x)  (x ## U)
34#define GG_UINT64_C(x)  GG_ULONGLONG(x)
35
36// It's possible for functions that use a va_list, such as StringPrintf, to
37// invalidate the data in it upon use.  The fix is to make a copy of the
38// structure before using it and use that copy instead.  va_copy is provided
39// for this purpose.  MSVC does not provide va_copy, so define an
40// implementation here.  It is not guaranteed that assignment is a copy, so the
41// StringUtil.VariableArgsFunc unit test tests this capability.
42#if defined(COMPILER_GCC)
43#define GG_VA_COPY(a, b) (va_copy(a, b))
44#elif defined(COMPILER_MSVC)
45#define GG_VA_COPY(a, b) (a = b)
46#endif
47
48// Define an OS-neutral wrapper for shared library entry points
49#if defined(OS_WIN)
50#define API_CALL __stdcall
51#else
52#define API_CALL
53#endif
54
55#endif  // BASE_PORT_H_
56