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50 lines
1.9 KiB
C
50 lines
1.9 KiB
C
/* wchar_t type related definitions.
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Copyright (C) 2000-2017 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#ifndef _BITS_WCHAR_H
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#define _BITS_WCHAR_H 1
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/* The fallback definitions, for when __WCHAR_MAX__ or __WCHAR_MIN__
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are not defined, give the right value and type as long as both int
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and wchar_t are 32-bit types. Adding L'\0' to a constant value
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ensures that the type is correct; it is necessary to use (L'\0' +
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0) rather than just L'\0' so that the type in C++ is the promoted
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version of wchar_t rather than the distinct wchar_t type itself.
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Because wchar_t in preprocessor #if expressions is treated as
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intmax_t or uintmax_t, the expression (L'\0' - 1) would have the
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wrong value for WCHAR_MAX in such expressions and so cannot be used
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to define __WCHAR_MAX in the unsigned case. */
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#ifdef __WCHAR_MAX__
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# define __WCHAR_MAX __WCHAR_MAX__
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#elif L'\0' - 1 > 0
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# define __WCHAR_MAX (0xffffffffu + L'\0')
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#else
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# define __WCHAR_MAX (0x7fffffff + L'\0')
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#endif
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#ifdef __WCHAR_MIN__
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# define __WCHAR_MIN __WCHAR_MIN__
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#elif L'\0' - 1 > 0
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# define __WCHAR_MIN (L'\0' + 0)
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#else
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# define __WCHAR_MIN (-__WCHAR_MAX - 1)
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#endif
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#endif /* bits/wchar.h */
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