mirror of https://github.com/libsdl-org/SDL.git
140 lines
4.1 KiB
C
140 lines
4.1 KiB
C
/*
|
|
Simple DirectMedia Layer
|
|
Copyright (C) 1997-2024 Sam Lantinga <slouken@libsdl.org>
|
|
|
|
This software is provided 'as-is', without any express or implied
|
|
warranty. In no event will the authors be held liable for any damages
|
|
arising from the use of this software.
|
|
|
|
Permission is granted to anyone to use this software for any purpose,
|
|
including commercial applications, and to alter it and redistribute it
|
|
freely, subject to the following restrictions:
|
|
|
|
1. The origin of this software must not be misrepresented; you must not
|
|
claim that you wrote the original software. If you use this software
|
|
in a product, an acknowledgment in the product documentation would be
|
|
appreciated but is not required.
|
|
2. Altered source versions must be plainly marked as such, and must not be
|
|
misrepresented as being the original software.
|
|
3. This notice may not be removed or altered from any source distribution.
|
|
*/
|
|
#include "SDL_internal.h"
|
|
|
|
#ifdef SDL_TIME_WINDOWS
|
|
|
|
#include "../../core/windows/SDL_windows.h"
|
|
#include <minwinbase.h>
|
|
#include <timezoneapi.h>
|
|
|
|
#include "../SDL_time_c.h"
|
|
|
|
#define NS_PER_WINDOWS_TICK 100ULL
|
|
#define WINDOWS_TICK 10000000ULL
|
|
#define UNIX_EPOCH_OFFSET_SEC 11644473600ULL
|
|
|
|
void SDL_GetSystemTimeLocalePreferences(SDL_DATE_FORMAT *df, SDL_TIME_FORMAT *tf)
|
|
{
|
|
WCHAR str[80]; /* Per the docs, the time and short date format strings can be a max of 80 characters. */
|
|
|
|
if (GetLocaleInfoW(LOCALE_USER_DEFAULT, LOCALE_SSHORTDATE, str, sizeof(str) / sizeof(WCHAR))) {
|
|
LPWSTR s = str;
|
|
while (*s) {
|
|
switch (*s++) {
|
|
case L'y':
|
|
*df = SDL_DATE_FORMAT_YYYYMMDD;
|
|
goto found_date;
|
|
case L'd':
|
|
*df = SDL_DATE_FORMAT_DDMMYYYY;
|
|
goto found_date;
|
|
case L'M':
|
|
*df = SDL_DATE_FORMAT_MMDDYYYY;
|
|
goto found_date;
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
found_date:
|
|
|
|
/* Figure out the preferred system date format. */
|
|
if (GetLocaleInfoW(LOCALE_USER_DEFAULT, LOCALE_STIMEFORMAT, str, sizeof(str) / sizeof(WCHAR))) {
|
|
LPWSTR s = str;
|
|
while (*s) {
|
|
switch (*s++) {
|
|
case L'H':
|
|
*tf = SDL_TIME_FORMAT_24HR;
|
|
return;
|
|
case L'h':
|
|
*tf = SDL_TIME_FORMAT_12HR;
|
|
return;
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
int SDL_GetCurrentTime(SDL_Time *ticks)
|
|
{
|
|
FILETIME ft;
|
|
|
|
if (!ticks) {
|
|
return SDL_InvalidParamError("ticks");
|
|
}
|
|
|
|
SDL_zero(ft);
|
|
GetSystemTimePreciseAsFileTime(&ft);
|
|
*ticks = SDL_TimeFromWindows(ft.dwLowDateTime, ft.dwHighDateTime);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int SDL_TimeToDateTime(SDL_Time ticks, SDL_DateTime *dt, SDL_bool localTime)
|
|
{
|
|
FILETIME ft, local_ft;
|
|
SYSTEMTIME utc_st, local_st;
|
|
SYSTEMTIME *st = NULL;
|
|
Uint32 low, high;
|
|
|
|
if (!dt) {
|
|
return SDL_InvalidParamError("dt");
|
|
}
|
|
|
|
SDL_TimeToWindows(ticks, &low, &high);
|
|
ft.dwLowDateTime = (DWORD)low;
|
|
ft.dwHighDateTime = (DWORD)high;
|
|
|
|
if (FileTimeToSystemTime(&ft, &utc_st)) {
|
|
if (localTime) {
|
|
if (SystemTimeToTzSpecificLocalTime(NULL, &utc_st, &local_st)) {
|
|
/* Calculate the difference for the UTC offset. */
|
|
SystemTimeToFileTime(&local_st, &local_ft);
|
|
const SDL_Time local_ticks = SDL_TimeFromWindows(local_ft.dwLowDateTime, local_ft.dwHighDateTime);
|
|
dt->utc_offset = SDL_NS_TO_SECONDS(local_ticks - ticks);
|
|
st = &local_st;
|
|
}
|
|
} else {
|
|
dt->utc_offset = 0;
|
|
st = &utc_st;
|
|
}
|
|
|
|
if (st) {
|
|
dt->year = st->wYear;
|
|
dt->month = st->wMonth;
|
|
dt->day = st->wDay;
|
|
dt->hour = st->wHour;
|
|
dt->minute = st->wMinute;
|
|
dt->second = st->wSecond;
|
|
dt->nanosecond = ticks % SDL_NS_PER_SECOND;
|
|
dt->day_of_week = st->wDayOfWeek;
|
|
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
return SDL_SetError("SDL_DateTime conversion failed (%lu)", GetLastError());
|
|
}
|
|
|
|
#endif /* SDL_TIME_WINDOWS */
|