port.h revision c7f5f8508d98d5952d42ed7648c2a8f30a4da156 
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
8#include <stdarg.h>
9#include "build/build_config.h"
10
11#ifdef COMPILER_MSVC
12#define GG_LONGLONG(x) x##I64
13#define GG_ULONGLONG(x) x##UI64
14#else
15#define GG_LONGLONG(x) x##LL
16#define GG_ULONGLONG(x) x##ULL
17#endif
18
19// Per C99 7.8.14, define __STDC_CONSTANT_MACROS before including <stdint.h>
20// to get the INTn_C and UINTn_C macros for integer constants.  It's difficult
21// to guarantee any specific ordering of header includes, so it's difficult to
22// guarantee that the INTn_C macros can be defined by including <stdint.h> at
23// any specific point.  Provide GG_INTn_C macros instead.
24
25#define GG_INT8_C(x)    (x)
26#define GG_INT16_C(x)   (x)
27#define GG_INT32_C(x)   (x)
28#define GG_INT64_C(x)   GG_LONGLONG(x)
29
30#define GG_UINT8_C(x)   (x ## U)
31#define GG_UINT16_C(x)  (x ## U)
32#define GG_UINT32_C(x)  (x ## U)
33#define GG_UINT64_C(x)  GG_ULONGLONG(x)
34
35// It's possible for functions that use a va_list, such as StringPrintf, to
36// invalidate the data in it upon use.  The fix is to make a copy of the
37// structure before using it and use that copy instead.  va_copy is provided
38// for this purpose.  MSVC does not provide va_copy, so define an
39// implementation here.  It is not guaranteed that assignment is a copy, so the
40// StringUtil.VariableArgsFunc unit test tests this capability.
41#if defined(COMPILER_GCC)
42#define GG_VA_COPY(a, b) (va_copy(a, b))
43#elif defined(COMPILER_MSVC)
44#define GG_VA_COPY(a, b) (a = b)
45#endif
46
47// Define an OS-neutral wrapper for shared library entry points
48#if defined(OS_WIN)
49#define API_CALL __stdcall
50#else
51#define API_CALL
52#endif
53
54#endif  // BASE_PORT_H_
55