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chrono: additional conversions

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Signed-off-by: Simon Rozman <simon@rozman.si>
This commit is contained in:
Simon Rozman 2023-08-22 17:00:58 +02:00
parent e28c61e431
commit f08aa73690
1 changed files with 91 additions and 0 deletions
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91
include/stdex/chrono.hpp
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@ -7,8 +7,10 @@
#include "sal.hpp"
#include "system.hpp"
#include "string.hpp"
#include <stdint.h>
#include <chrono>
#include <memory>
#include <stdexcept>
namespace stdex {
@ -256,6 +258,23 @@ namespace stdex {
}
#endif
static void to_system(_In_ time_point tp, _Out_ struct tm& date) noexcept
{
uint8_t day, month, hour, minute, second;
uint16_t millisecond;
int32_t year;
to_dmy(tp, &day, &month, &year, &hour, &minute, &second, &millisecond);
date.tm_sec = second;
date.tm_min = minute;
date.tm_hour = hour;
date.tm_mday = day;
date.tm_mon = month - 1;
date.tm_year = year - 1900;
date.tm_wday = (static_cast<int>(aosn_date::day_of_week(to_date(tp))) + 1) % 7;
date.tm_yday = 0;
date.tm_isdst = 0;
}
///
/// Returns aosn_date::time_point from time point
///
@ -301,6 +320,78 @@ namespace stdex {
u = u / f_hour;
if (hour) *hour = static_cast<uint8_t>(u);
}
template<class _Traits = std::char_traits<char>, class _Ax = std::allocator<char>>
static std::basic_string<char, _Traits, _Ax> to_str(_In_ const time_point tp, _In_z_ const char* format, _In_opt_ locale_t locale)
{
struct tm date;
to_system(tp, date);
std::basic_string<char, _Traits, _Ax> str;
char stack_buffer[1024 / sizeof(char)];
size_t n;
#if _WIN32
n = _strftime_l(stack_buffer, _countof(stack_buffer), format, &date, locale);
#else
n = strftime_l(stack_buffer, _countof(stack_buffer), format, &date, locale);
#endif
if (n) {
str.assign(stack_buffer, stack_buffer + n);
return str;
}
size_t num_chars = stdex::mul(_countof(stack_buffer), 2);
for (;;) {
std::unique_ptr<char> buf(new char[num_chars]);
#if _WIN32
n = _strftime_l(buf.get(), num_chars, format, &date, locale);
#else
n = strftime_l(buf.get(), num_chars, format, &date, locale);
#endif
if (n) {
str.assign(buf.get(), buf.get() + n);
return str;
}
num_chars = stdex::mul(num_chars, 2);
}
}
template<class _Traits = std::char_traits<wchar_t>, class _Ax = std::allocator<wchar_t>>
static std::basic_string<wchar_t, _Traits, _Ax> to_str(_In_ const time_point tp, _In_z_ const wchar_t* format, _In_opt_ locale_t locale)
{
struct tm date;
to_system(tp, date);
std::basic_string<wchar_t, _Traits, _Ax> str;
wchar_t stack_buffer[1024 / sizeof(wchar_t)];
size_t n;
#if _WIN32
n = _wcsftime_l(stack_buffer, _countof(stack_buffer), format, &date, locale);
#else
n = wcsftime_l(stack_buffer, _countof(stack_buffer), format, &date, locale);
#endif
if (n) {
str.assign(stack_buffer, stack_buffer + n);
return str;
}
size_t num_chars = stdex::mul(_countof(stack_buffer), 2);
for (;;) {
std::unique_ptr<wchar_t> buf(new wchar_t[num_chars]);
#if _WIN32
n = _wcsftime_l(buf.get(), num_chars, format, &date, locale);
#else
n = wcsftime_l(buf.get(), num_chars, format, &date, locale);
#endif
if (n) {
str.assign(buf.get(), buf.get() + n);
return str;
}
num_chars = stdex::mul(num_chars, 2);
}
}
template<class _Traits = std::char_traits<char>, class _Ax = std::allocator<char>>
static std::basic_string<char, _Traits, _Ax> to_rfc822(_In_ const time_point tp)
{
return to_str(tp, "%a, %d %b %Y %H:%M:%S GMT", locale_C);
}
};
}
}