lh | 9ed821d | 2023-04-07 01:36:19 -0700 | [diff] [blame^] | 1 | /* wchar_t type related definitions. |
| 2 | Copyright (C) 2000-2015 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 | <http://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 */ |