From 5a079a2d114f96d4847d1ee305d5b7c16eeec50e Mon Sep 17 00:00:00 2001
From: 3gg <3gg@shellblade.net>
Date: Sat, 27 Dec 2025 12:03:39 -0800
Subject: Initial commit

---
 contrib/SDL-3.2.8/src/time/windows/SDL_systime.c | 157 +++++++++++++++++++++++
 1 file changed, 157 insertions(+)
 create mode 100644 contrib/SDL-3.2.8/src/time/windows/SDL_systime.c

(limited to 'contrib/SDL-3.2.8/src/time/windows/SDL_systime.c')

diff --git a/contrib/SDL-3.2.8/src/time/windows/SDL_systime.c b/contrib/SDL-3.2.8/src/time/windows/SDL_systime.c
new file mode 100644
index 0000000..4bc1e99
--- /dev/null
+++ b/contrib/SDL-3.2.8/src/time/windows/SDL_systime.c
@@ -0,0 +1,157 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2025 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 "../SDL_time_c.h"
+
+#define NS_PER_WINDOWS_TICK   100ULL
+#define WINDOWS_TICK          10000000ULL
+#define UNIX_EPOCH_OFFSET_SEC 11644473600ULL
+
+typedef void(WINAPI *pfnGetSystemTimePreciseAsFileTime)(FILETIME *);
+
+void SDL_GetSystemTimeLocalePreferences(SDL_DateFormat *df, SDL_TimeFormat *tf)
+{
+    WCHAR str[80]; // Per the docs, the time and short date format strings can be a max of 80 characters.
+
+    if (df && 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 (tf && 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;
+            }
+        }
+    }
+}
+
+bool SDL_GetCurrentTime(SDL_Time *ticks)
+{
+    FILETIME ft;
+
+    if (!ticks) {
+        return SDL_InvalidParamError("ticks");
+    }
+
+    SDL_zero(ft);
+
+    static pfnGetSystemTimePreciseAsFileTime pGetSystemTimePreciseAsFileTime = NULL;
+    static bool load_attempted = false;
+
+    // Only available in Win8/Server 2012 or higher.
+    if (!pGetSystemTimePreciseAsFileTime && !load_attempted) {
+        HMODULE kernel32 = GetModuleHandle(TEXT("kernel32.dll"));
+        if (kernel32) {
+            pGetSystemTimePreciseAsFileTime = (pfnGetSystemTimePreciseAsFileTime)GetProcAddress(kernel32, "GetSystemTimePreciseAsFileTime");
+        }
+        load_attempted = true;
+    }
+
+    if (pGetSystemTimePreciseAsFileTime) {
+        pGetSystemTimePreciseAsFileTime(&ft);
+    } else {
+        GetSystemTimeAsFileTime(&ft);
+    }
+
+    *ticks = SDL_TimeFromWindows(ft.dwLowDateTime, ft.dwHighDateTime);
+
+    return true;
+}
+
+bool SDL_TimeToDateTime(SDL_Time ticks, SDL_DateTime *dt, 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 = (int)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 true;
+        }
+    }
+
+    return SDL_SetError("SDL_DateTime conversion failed (%lu)", GetLastError());
+}
+
+#endif // SDL_TIME_WINDOWS
-- 
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