Initial Commit

thirdparty/SDL3-3.4.0/src/locale/windows/SDL_syslocale.c

@@ -0,0 +1,111 @@
+/*
+  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"
+#include "../../core/windows/SDL_windows.h"
+#include "../SDL_syslocale.h"
+
+typedef BOOL (WINAPI *pfnGetUserPreferredUILanguages)(DWORD, PULONG, WCHAR *, PULONG);
+#ifndef MUI_LANGUAGE_NAME
+#define MUI_LANGUAGE_NAME 0x8
+#endif
+
+static pfnGetUserPreferredUILanguages pGetUserPreferredUILanguages = NULL;
+static HMODULE kernel32 = 0;
+
+// this is the fallback for WinXP...one language, not a list.
+static bool SDL_SYS_GetPreferredLocales_winxp(char *buf, size_t buflen)
+{
+    char lang[16];
+    char country[16];
+
+    const int langrc = GetLocaleInfoA(LOCALE_USER_DEFAULT,
+                                      LOCALE_SISO639LANGNAME,
+                                      lang, sizeof(lang));
+
+    const int ctryrc = GetLocaleInfoA(LOCALE_USER_DEFAULT,
+                                      LOCALE_SISO3166CTRYNAME,
+                                      country, sizeof(country));
+
+    /* Win95 systems will fail, because they don't have LOCALE_SISO*NAME ... */
+    if (langrc == 0) {
+        return SDL_SetError("Couldn't obtain language info");
+    } else {
+        (void)SDL_snprintf(buf, buflen, "%s%s%s", lang, ctryrc ? "_" : "", ctryrc ? country : "");
+        return true;
+    }
+}
+
+// this works on Windows Vista and later.
+static bool SDL_SYS_GetPreferredLocales_vista(char *buf, size_t buflen)
+{
+    ULONG numlangs = 0;
+    WCHAR *wbuf = NULL;
+    ULONG wbuflen = 0;
+    bool isstack;
+
+    SDL_assert(pGetUserPreferredUILanguages != NULL);
+    pGetUserPreferredUILanguages(MUI_LANGUAGE_NAME, &numlangs, NULL, &wbuflen);
+
+    wbuf = SDL_small_alloc(WCHAR, wbuflen, &isstack);
+    if (!wbuf) {
+        return false;
+    }
+
+    if (!pGetUserPreferredUILanguages(MUI_LANGUAGE_NAME, &numlangs, wbuf, &wbuflen)) {
+        SDL_SYS_GetPreferredLocales_winxp(buf, buflen); // oh well, try the fallback.
+    } else {
+        const ULONG endidx = (ULONG)SDL_min(buflen, wbuflen - 1);
+        ULONG str_start = 0;
+        ULONG i;
+        for (i = 0; i < endidx; i++) {
+            const char ch = (char)wbuf[i]; // these should all be low-ASCII, safe to cast
+            if (ch == '\0') {
+                buf[i] = ','; // change null separators to commas
+                str_start = i;
+            } else if (ch == '-') {
+                buf[i] = '_'; // change '-' to '_'
+            } else {
+                buf[i] = ch; // copy through as-is.
+            }
+        }
+        buf[str_start] = '\0'; // terminate string, chop off final ','
+    }
+
+    SDL_small_free(wbuf, isstack);
+    return true;
+}
+
+bool SDL_SYS_GetPreferredLocales(char *buf, size_t buflen)
+{
+    if (!kernel32) {
+        kernel32 = GetModuleHandle(TEXT("kernel32.dll"));
+        if (kernel32) {
+            pGetUserPreferredUILanguages = (pfnGetUserPreferredUILanguages)GetProcAddress(kernel32, "GetUserPreferredUILanguages");
+        }
+    }
+
+    if (!pGetUserPreferredUILanguages) {
+        return SDL_SYS_GetPreferredLocales_winxp(buf, buflen); // this is always available
+    } else {
+        return SDL_SYS_GetPreferredLocales_vista(buf, buflen); // available on Vista and later.
+    }
+}