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04e0dc4a7a
Imported from https://www.nuget.org/packages/Microsoft.Windows.SDK.CRTSource/10.0.22621.3 License: MIT
52 lines
2.2 KiB
C++
52 lines
2.2 KiB
C++
//
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// lconv_unsigned_char_initialization.cpp
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//
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// Copyright (c) Microsoft Corporation. All rights reserved.
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//
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// lconv initialization used to support an unsigned 'char' type (enabled by the
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// -J flag during compilation). Per the specification, some members of the lconv
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// structure must be initialized to CHAR_MAX. The value of CHAR_MAX, however,
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// depends on whether the 'char' type is signed or unsigned (it is 127 for a
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// signed 'char'; 255 for an unsigned 'char').
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//
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// By default, these members of lconv are initialized to SCHAR_MAX (127). If an
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// unsigned 'char' type is used, we call this function to update those members
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// to UCHAR_MAX (255). Note that this is not done for DLLs that are linked to
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// the CRT DLL, because we do not want such DLLs to override the -J setting for
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// an EXE linked to the CRT DLL.
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//
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// There is code in several other files that is required to make all of this work:
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//
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// * locale.h: When -J is used to compile a source file that includes <locale.h>,
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// it generates an unresolved external to __do_unsigned_char_lconv_initialization.
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//
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// * lconv_unsigned_char_static.cpp: This file defines a global variable named
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// __do_unsigned_char_lconv_initialization, and is used during the link to
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// satisfy the unresolved external. This file adds a call to
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// __initialize_lconv_for_unsigned_char to the list of initializers to be
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// executed. That function (defined below) updates the fields of the lconv
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// structure to be set to UCHAR_MAX.
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//
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// * localeconv.cpp: This file defines the __acrt_lconv_c structure.
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//
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#include <corecrt_internal.h>
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#include <limits.h>
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#include <locale.h>
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#pragma warning(disable: 4310) // cast truncates constant value
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extern "C" int __cdecl __initialize_lconv_for_unsigned_char()
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{
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__acrt_lconv_c.int_frac_digits = (char)UCHAR_MAX;
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__acrt_lconv_c.frac_digits = (char)UCHAR_MAX;
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__acrt_lconv_c.p_cs_precedes = (char)UCHAR_MAX;
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__acrt_lconv_c.p_sep_by_space = (char)UCHAR_MAX;
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__acrt_lconv_c.n_cs_precedes = (char)UCHAR_MAX;
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__acrt_lconv_c.n_sep_by_space = (char)UCHAR_MAX;
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__acrt_lconv_c.p_sign_posn = (char)UCHAR_MAX;
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__acrt_lconv_c.n_sign_posn = (char)UCHAR_MAX;
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return 0;
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}
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