michael@0: // Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
michael@0: // Use of this source code is governed by a BSD-style license that can be
michael@0: // found in the LICENSE file.
michael@0: 
michael@0: #ifndef BASE_PORT_H_
michael@0: #define BASE_PORT_H_
michael@0: 
michael@0: #include <stdarg.h>
michael@0: #include "build/build_config.h"
michael@0: 
michael@0: #ifdef COMPILER_MSVC
michael@0: #define GG_LONGLONG(x) x##I64
michael@0: #define GG_ULONGLONG(x) x##UI64
michael@0: #else
michael@0: #define GG_LONGLONG(x) x##LL
michael@0: #define GG_ULONGLONG(x) x##ULL
michael@0: #endif
michael@0: 
michael@0: // Per C99 7.8.14, define __STDC_CONSTANT_MACROS before including <stdint.h>
michael@0: // to get the INTn_C and UINTn_C macros for integer constants.  It's difficult
michael@0: // to guarantee any specific ordering of header includes, so it's difficult to
michael@0: // guarantee that the INTn_C macros can be defined by including <stdint.h> at
michael@0: // any specific point.  Provide GG_INTn_C macros instead.
michael@0: 
michael@0: #define GG_INT8_C(x)    (x)
michael@0: #define GG_INT16_C(x)   (x)
michael@0: #define GG_INT32_C(x)   (x)
michael@0: #define GG_INT64_C(x)   GG_LONGLONG(x)
michael@0: 
michael@0: #define GG_UINT8_C(x)   (x ## U)
michael@0: #define GG_UINT16_C(x)  (x ## U)
michael@0: #define GG_UINT32_C(x)  (x ## U)
michael@0: #define GG_UINT64_C(x)  GG_ULONGLONG(x)
michael@0: 
michael@0: namespace base {
michael@0: 
michael@0: // It's possible for functions that use a va_list, such as StringPrintf, to
michael@0: // invalidate the data in it upon use.  The fix is to make a copy of the
michael@0: // structure before using it and use that copy instead.  va_copy is provided
michael@0: // for this purpose.  MSVC does not provide va_copy, so define an
michael@0: // implementation here.  It is not guaranteed that assignment is a copy, so the
michael@0: // StringUtil.VariableArgsFunc unit test tests this capability.
michael@0: 
michael@0: // The C standard says that va_copy is a "macro", not a function.  Trying to 
michael@0: // use va_list as ref args to a function, as above, breaks some machines.
michael@0: #  if defined(COMPILER_GCC)
michael@0: #    define base_va_copy(_a, _b) ::va_copy(_a, _b)
michael@0: #  elif defined(COMPILER_MSVC)
michael@0: #    define base_va_copy(_a, _b) (_a = _b)
michael@0: #  else
michael@0: #    error No va_copy for your compiler
michael@0: #  endif
michael@0: 
michael@0: }  // namespace base
michael@0: 
michael@0: // Define an OS-neutral wrapper for shared library entry points
michael@0: #if defined(OS_WIN)
michael@0: #define API_CALL __stdcall
michael@0: #elif defined(OS_LINUX) || defined(OS_MACOSX)
michael@0: #define API_CALL
michael@0: #endif
michael@0: 
michael@0: #endif  // BASE_PORT_H_