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mingkuang
125 lines
3.3 KiB
C++
125 lines
3.3 KiB
C++
//
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// atof.cpp
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//
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// Copyright (c) Microsoft Corporation. All rights reserved.
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//
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// Definitions of the functions that convert strings to floating point numbers.
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// Note that the str- and wcs-prefixed functions are defined elsewhere. The
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// functions defined here are provided for legacy support.
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//
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// The _atoxxx family of functions convert a string into a floating point
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// number and return either zero (success), or _UNDERFLOW or _OVERFLOW.
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//
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#include <corecrt_internal_strtox.h>
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template <typename FloatingType, typename Character>
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static int __cdecl common_atodbl_l(
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FloatingType* const result,
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Character const* const string,
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_locale_t const locale
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) throw()
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{
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_VALIDATE_RETURN(result != nullptr, EINVAL, _DOMAIN);
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//_LocaleUpdate locale_update(locale);
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SLD_STATUS const status = __crt_strtox::parse_floating_point(
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locale,
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__crt_strtox::make_c_string_character_source(string, nullptr),
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result);
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switch (status)
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{
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case SLD_OVERFLOW: return _OVERFLOW;
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case SLD_UNDERFLOW: return _UNDERFLOW;
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default: return 0;
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}
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}
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#if WindowsTargetPlatformMinVersion < WindowsTargetPlatformWindows6
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extern "C" int __cdecl _atoflt_l(_CRT_FLOAT* const result, char const* const string, _locale_t const locale)
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{
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return common_atodbl_l(&result->f, string, locale);
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}
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_LCRT_DEFINE_IAT_SYMBOL(_atoflt_l);
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#endif
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#if WindowsTargetPlatformMinVersion < WindowsTargetPlatformWindows10_10240
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extern "C" int __cdecl _atoflt(_CRT_FLOAT* const result, char const* const string)
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{
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#if WindowsTargetPlatformMinVersion < WindowsTargetPlatformWindows6
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return common_atodbl_l(&result->f, string, nullptr);
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#else
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return _atoflt_l(result, string, nullptr);
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#endif
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}
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_LCRT_DEFINE_IAT_SYMBOL(_atoflt);
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#endif
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#if WindowsTargetPlatformMinVersion < WindowsTargetPlatformWindows6
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extern "C" int __cdecl _atodbl_l(_CRT_DOUBLE* const result, char* const string, _locale_t const locale)
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{
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return common_atodbl_l(&result->x, string, locale);
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}
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_LCRT_DEFINE_IAT_SYMBOL(_atodbl_l);
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#endif
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#if 0
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extern "C" int __cdecl _atodbl(_CRT_DOUBLE* const result, char* const string)
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{
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return common_atodbl_l(&result->x, string, nullptr);
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}
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#endif
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template <typename Character>
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static double __cdecl common_atof_l(Character const* const string, _locale_t const locale) throw()
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{
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_VALIDATE_RETURN(string != nullptr, EINVAL, 0.0);
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//_LocaleUpdate locale_update(locale);
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double result{};
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__crt_strtox::parse_floating_point(
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locale,
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__crt_strtox::make_c_string_character_source(string, nullptr),
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&result);
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return result;
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}
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#if WindowsTargetPlatformMinVersion < WindowsTargetPlatformWindows6
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extern "C" double __cdecl _atof_l(char const* const string, _locale_t const locale)
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{
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return common_atof_l(string, locale);
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}
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_LCRT_DEFINE_IAT_SYMBOL(_atof_l);
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#endif
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#if 0
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extern "C" double __cdecl atof(char const* const string)
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{
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return common_atof_l(string, nullptr);
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}
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#endif
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#if WindowsTargetPlatformMinVersion < WindowsTargetPlatformWindows6
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extern "C" double __cdecl _wtof_l(wchar_t const* const string, _locale_t const locale)
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{
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return common_atof_l(string, locale);
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}
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_LCRT_DEFINE_IAT_SYMBOL(_wtof_l);
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#endif
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#if 0
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extern "C" double __cdecl _wtof(wchar_t const* const string)
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{
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return common_atof_l(string, nullptr);
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}
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#endif
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