1 //
2 // atof.cpp
3 //
4 // Copyright (c) Microsoft Corporation. All rights reserved.
5 //
6 // Definitions of the functions that convert strings to floating point numbers.
7 // Note that the str- and wcs-prefixed functions are defined elsewhere. The
8 // functions defined here are provided for legacy support.
9 //
10 // The _atoxxx family of functions convert a string into a floating point
11 // number and return either zero (success), or _UNDERFLOW or _OVERFLOW.
12 //
13 #define _ALLOW_OLD_VALIDATE_MACROS
14 #include <corecrt_internal_strtox.h>
15
16
17
18 template <typename FloatingType, typename Character>
common_atodbl_l(FloatingType * const result,Character const * const string,_locale_t const locale)19 static int __cdecl common_atodbl_l(
20 FloatingType* const result,
21 Character const* const string,
22 _locale_t const locale
23 ) throw()
24 {
25 _VALIDATE_RETURN(result != nullptr, EINVAL, _DOMAIN);
26
27 _LocaleUpdate locale_update(locale);
28 SLD_STATUS const status = __crt_strtox::parse_floating_point(
29 locale_update.GetLocaleT(),
30 __crt_strtox::make_c_string_character_source(string, nullptr),
31 result);
32
33 switch (status)
34 {
35 case SLD_OVERFLOW: return _OVERFLOW;
36 case SLD_UNDERFLOW: return _UNDERFLOW;
37 default: return 0;
38 }
39 }
40
_atoflt_l(_CRT_FLOAT * const result,char const * const string,_locale_t const locale)41 extern "C" int __cdecl _atoflt_l(_CRT_FLOAT* const result, char const* const string, _locale_t const locale)
42 {
43 return common_atodbl_l(&result->f, string, locale);
44 }
45
_atoflt(_CRT_FLOAT * const result,char const * const string)46 extern "C" int __cdecl _atoflt(_CRT_FLOAT* const result, char const* const string)
47 {
48 return common_atodbl_l(&result->f, string, nullptr);
49 }
50
_atodbl_l(_CRT_DOUBLE * const result,char * const string,_locale_t const locale)51 extern "C" int __cdecl _atodbl_l(_CRT_DOUBLE* const result, char* const string, _locale_t const locale)
52 {
53 return common_atodbl_l(&result->x, string, locale);
54 }
55
_atodbl(_CRT_DOUBLE * const result,char * const string)56 extern "C" int __cdecl _atodbl(_CRT_DOUBLE* const result, char* const string)
57 {
58 return common_atodbl_l(&result->x, string, nullptr);
59 }
60
61
62
63 template <typename Character>
common_atof_l(Character const * const string,_locale_t const locale)64 static double __cdecl common_atof_l(Character const* const string, _locale_t const locale) throw()
65 {
66 _VALIDATE_RETURN(string != nullptr, EINVAL, 0.0);
67
68 _LocaleUpdate locale_update(locale);
69
70 double result{};
71 __crt_strtox::parse_floating_point(
72 locale_update.GetLocaleT(),
73 __crt_strtox::make_c_string_character_source(string, nullptr),
74 &result);
75 return result;
76 }
77
_atof_l(char const * const string,_locale_t const locale)78 extern "C" double __cdecl _atof_l(char const* const string, _locale_t const locale)
79 {
80 return common_atof_l(string, locale);
81 }
82
atof(char const * const string)83 extern "C" double __cdecl atof(char const* const string)
84 {
85 return common_atof_l(string, nullptr);
86 }
87
_wtof_l(wchar_t const * const string,_locale_t const locale)88 extern "C" double __cdecl _wtof_l(wchar_t const* const string, _locale_t const locale)
89 {
90 return common_atof_l(string, locale);
91 }
92
_wtof(wchar_t const * const string)93 extern "C" double __cdecl _wtof(wchar_t const* const string)
94 {
95 return common_atof_l(string, nullptr);
96 }
97