1 files changed, 147 insertions, 0 deletions

diff --git a/contrib/SDL-3.2.8/src/time/n3ds/SDL_systime.c b/contrib/SDL-3.2.8/src/time/n3ds/SDL_systime.c
new file mode 100644
index 0000000..61ab9fa
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+++ b/contrib/SDL-3.2.8/src/time/n3ds/SDL_systime.c
@@ -0,0 +1,147 @@
+/*
+  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_N3DS
+
+#include "../SDL_time_c.h"
+#include <3ds.h>
+
+/*
+ * The 3DS clock is essentially a simple digital watch and provides
+ * no timezone or DST functionality.
+ */
+
+// 3DS epoch is Jan 1 1900
+#define DELTA_EPOCH_1900_OFFSET_MS 2208988800000LL
+
+/* Returns year/month/day triple in civil calendar
+ * Preconditions:  z is number of days since 1970-01-01 and is in the range:
+ *                 [INT_MIN, INT_MAX-719468].
+ *
+ * http://howardhinnant.github.io/date_algorithms.html#civil_from_days
+ */
+static void civil_from_days(int days, int *year, int *month, int *day)
+{
+    days += 719468;
+    const int era = (days >= 0 ? days : days - 146096) / 146097;
+    const unsigned doe = (unsigned)(days - era * 146097);                       // [0, 146096]
+    const unsigned yoe = (doe - doe / 1460 + doe / 36524 - doe / 146096) / 365; // [0, 399]
+    const int y = (int)(yoe) + era * 400;
+    const unsigned doy = doe - (365 * yoe + yoe / 4 - yoe / 100); // [0, 365]
+    const unsigned mp = (5 * doy + 2) / 153;                      // [0, 11]
+    const unsigned d = doy - (153 * mp + 2) / 5 + 1;              // [1, 31]
+    const unsigned m = mp < 10 ? mp + 3 : mp - 9;                 // [1, 12]
+
+    *year = y + (m <= 2);
+    *month = (int)m;
+    *day = (int)d;
+}
+
+void SDL_GetSystemTimeLocalePreferences(SDL_DateFormat *df, SDL_TimeFormat *tf)
+{
+    // The 3DS only has 12 supported languages, so take the standard for each
+    static const SDL_DateFormat LANG_TO_DATE_FORMAT[] = {
+        SDL_DATE_FORMAT_YYYYMMDD, // JP
+        SDL_DATE_FORMAT_DDMMYYYY, // EN, assume non-american format
+        SDL_DATE_FORMAT_DDMMYYYY, // FR
+        SDL_DATE_FORMAT_DDMMYYYY, // DE
+        SDL_DATE_FORMAT_DDMMYYYY, // IT
+        SDL_DATE_FORMAT_DDMMYYYY, // ES
+        SDL_DATE_FORMAT_YYYYMMDD, // ZH (CN)
+        SDL_DATE_FORMAT_YYYYMMDD, // KR
+        SDL_DATE_FORMAT_DDMMYYYY, // NL
+        SDL_DATE_FORMAT_DDMMYYYY, // PT
+        SDL_DATE_FORMAT_DDMMYYYY, // RU
+        SDL_DATE_FORMAT_YYYYMMDD  // ZH (TW)
+    };
+    u8 system_language, is_north_america;
+    Result result, has_region;
+
+    if (R_FAILED(cfguInit())) {
+        return;
+    }
+    result = CFGU_GetSystemLanguage(&system_language);
+    has_region = CFGU_GetRegionCanadaUSA(&is_north_america);
+    cfguExit();
+    if (R_FAILED(result)) {
+        return;
+    }
+
+    if (df) {
+        *df = LANG_TO_DATE_FORMAT[system_language];
+    }
+    if (tf) {
+        *tf = SDL_TIME_FORMAT_24HR;
+    }
+
+    /* Only American English (en_US) uses MM/DD/YYYY and 12hr system, this gets
+       the formats wrong for canadians though (en_CA) */
+    if (system_language == CFG_LANGUAGE_EN &&
+        R_SUCCEEDED(has_region) && is_north_america) {
+        if (df) {
+            *df = SDL_DATE_FORMAT_MMDDYYYY;
+        }
+        if (tf) {
+            *tf = SDL_TIME_FORMAT_12HR;
+        }
+    }
+}
+
+bool SDL_GetCurrentTime(SDL_Time *ticks)
+{
+    if (!ticks) {
+        return SDL_InvalidParamError("ticks");
+    }
+
+    // Returns milliseconds since the epoch.
+    const Uint64 ndsTicksMax = (SDL_MAX_TIME / SDL_NS_PER_MS) + DELTA_EPOCH_1900_OFFSET_MS;
+    const Uint64 ndsTicks = SDL_min(osGetTime(), ndsTicksMax);
+
+    *ticks = SDL_MS_TO_NS(ndsTicks - DELTA_EPOCH_1900_OFFSET_MS);
+
+    return true;
+}
+
+bool SDL_TimeToDateTime(SDL_Time ticks, SDL_DateTime *dt, bool localTime)
+{
+    if (!dt) {
+        return SDL_InvalidParamError("dt");
+    }
+
+    const int days = (int)(SDL_NS_TO_SECONDS(ticks) / SDL_SECONDS_PER_DAY);
+    civil_from_days(days, &dt->year, &dt->month, &dt->day);
+
+    int rem = (int)(SDL_NS_TO_SECONDS(ticks) - (days * SDL_SECONDS_PER_DAY));
+    dt->hour = rem / (60 * 60);
+    rem -= dt->hour * 60 * 60;
+    dt->minute = rem / 60;
+    rem -= dt->minute * 60;
+    dt->second = rem;
+    dt->nanosecond = ticks % SDL_NS_PER_SECOND;
+    dt->utc_offset = 0; // Unknown
+
+    SDL_CivilToDays(dt->year, dt->month, dt->day, &dt->day_of_week, NULL);
+
+    return true;
+}
+
+#endif // SDL_TIME_N3DS