change build system to CMake and use SDL3 for everything

libs/SDL3/src/locale/unix/SDL_syslocale.c

@@ -0,0 +1,103 @@
+/*
+  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 "../SDL_syslocale.h"
+
+static void normalize_locale_str(char *dst, char *str, size_t buflen)
+{
+    char *ptr;
+
+    ptr = SDL_strchr(str, '.'); // chop off encoding if specified.
+    if (ptr) {
+        *ptr = '\0';
+    }
+
+    ptr = SDL_strchr(str, '@'); // chop off extra bits if specified.
+    if (ptr) {
+        *ptr = '\0';
+    }
+
+    // The "C" locale isn't useful for our needs, ignore it if you see it.
+    if ((str[0] == 'C') && (str[1] == '\0')) {
+        return;
+    }
+
+    if (*str) {
+        if (*dst) {
+            SDL_strlcat(dst, ",", buflen); // SDL has these split by commas
+        }
+        SDL_strlcat(dst, str, buflen);
+    }
+}
+
+static void normalize_locales(char *dst, char *src, size_t buflen)
+{
+    char *ptr;
+
+    // entries are separated by colons
+    while ((ptr = SDL_strchr(src, ':')) != NULL) {
+        *ptr = '\0';
+        normalize_locale_str(dst, src, buflen);
+        src = ptr + 1;
+    }
+    normalize_locale_str(dst, src, buflen);
+}
+
+bool SDL_SYS_GetPreferredLocales(char *buf, size_t buflen)
+{
+    // !!! FIXME: should we be using setlocale()? Or some D-Bus thing?
+    bool isstack;
+    const char *envr;
+    char *tmp;
+
+    SDL_assert(buflen > 0);
+    tmp = SDL_small_alloc(char, buflen, &isstack);
+    if (!tmp) {
+        return false;
+    }
+
+    *tmp = '\0';
+
+    // LANG is the primary locale (maybe)
+    envr = SDL_getenv("LANG");
+    if (envr) {
+        SDL_strlcpy(tmp, envr, buflen);
+    }
+
+    // fallback languages
+    envr = SDL_getenv("LANGUAGE");
+    if (envr) {
+        if (*tmp) {
+            SDL_strlcat(tmp, ":", buflen);
+        }
+        SDL_strlcat(tmp, envr, buflen);
+    }
+
+    if (*tmp == '\0') {
+        SDL_SetError("LANG environment variable isn't set");
+    } else {
+        normalize_locales(buf, tmp, buflen);
+    }
+
+    SDL_small_free(tmp, isstack);
+    return true;
+}