1/* wchar_t type related definitions. 
2 Copyright (C) 2000-2020 Free Software Foundation, Inc. 
3 This file is part of the GNU C Library. 
4 
5 The GNU C Library is free software; you can redistribute it and/or 
6 modify it under the terms of the GNU Lesser General Public 
7 License as published by the Free Software Foundation; either 
8 version 2.1 of the License, or (at your option) any later version. 
9 
10 The GNU C Library is distributed in the hope that it will be useful, 
11 but WITHOUT ANY WARRANTY; without even the implied warranty of 
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 
13 Lesser General Public License for more details. 
14 
15 You should have received a copy of the GNU Lesser General Public 
16 License along with the GNU C Library; if not, see 
17 <https://www.gnu.org/licenses/>. */ 
18 
19#ifndef _BITS_WCHAR_H 
20#define _BITS_WCHAR_H 1 
21 
22/* The fallback definitions, for when __WCHAR_MAX__ or __WCHAR_MIN__ 
23 are not defined, give the right value and type as long as both int 
24 and wchar_t are 32-bit types. Adding L'\0' to a constant value 
25 ensures that the type is correct; it is necessary to use (L'\0' + 
26 0) rather than just L'\0' so that the type in C++ is the promoted 
27 version of wchar_t rather than the distinct wchar_t type itself. 
28 Because wchar_t in preprocessor #if expressions is treated as 
29 intmax_t or uintmax_t, the expression (L'\0' - 1) would have the 
30 wrong value for WCHAR_MAX in such expressions and so cannot be used 
31 to define __WCHAR_MAX in the unsigned case. */ 
32 
33#ifdef __WCHAR_MAX__ 
34# define __WCHAR_MAX __WCHAR_MAX__ 
35#elif L'\0' - 1 > 0 
36# define __WCHAR_MAX (0xffffffffu + L'\0') 
37#else 
38# define __WCHAR_MAX (0x7fffffff + L'\0') 
39#endif 
40 
41#ifdef __WCHAR_MIN__ 
42# define __WCHAR_MIN __WCHAR_MIN__ 
43#elif L'\0' - 1 > 0 
44# define __WCHAR_MIN (L'\0' + 0) 
45#else 
46# define __WCHAR_MIN (-__WCHAR_MAX - 1) 
47#endif 
48 
49#endif /* bits/wchar.h */ 
50