| /* wchar_t type related definitions. |
| Copyright (C) 2000-2019 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| |
| The GNU C Library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Lesser General Public |
| License as published by the Free Software Foundation; either |
| version 2.1 of the License, or (at your option) any later version. |
| |
| The GNU C Library is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with the GNU C Library; if not, see |
| <http://www.gnu.org/licenses/>. */ |
| |
| #ifndef _BITS_WCHAR_H |
| #define _BITS_WCHAR_H 1 |
| |
| /* The fallback definitions, for when __WCHAR_MAX__ or __WCHAR_MIN__ |
| are not defined, give the right value and type as long as both int |
| and wchar_t are 32-bit types. Adding L'\0' to a constant value |
| ensures that the type is correct; it is necessary to use (L'\0' + |
| 0) rather than just L'\0' so that the type in C++ is the promoted |
| version of wchar_t rather than the distinct wchar_t type itself. |
| Because wchar_t in preprocessor #if expressions is treated as |
| intmax_t or uintmax_t, the expression (L'\0' - 1) would have the |
| wrong value for WCHAR_MAX in such expressions and so cannot be used |
| to define __WCHAR_MAX in the unsigned case. */ |
| |
| #ifdef __WCHAR_MAX__ |
| # define __WCHAR_MAX __WCHAR_MAX__ |
| #elif L'\0' - 1 > 0 |
| # define __WCHAR_MAX (0xffffffffu + L'\0') |
| #else |
| # define __WCHAR_MAX (0x7fffffff + L'\0') |
| #endif |
| |
| #ifdef __WCHAR_MIN__ |
| # define __WCHAR_MIN __WCHAR_MIN__ |
| #elif L'\0' - 1 > 0 |
| # define __WCHAR_MIN (L'\0' + 0) |
| #else |
| # define __WCHAR_MIN (-__WCHAR_MAX - 1) |
| #endif |
| |
| #endif /* bits/wchar.h */ |
