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Simple DirectMedia Layer
Copyright (C) 1997-2021 Sam Lantinga <>
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"
#import <Foundation/Foundation.h>
SDL_SYS_GetPreferredLocales(char *buf, size_t buflen)
{ @autoreleasepool {
NSArray *languages = NSLocale.preferredLanguages;
size_t numlangs = 0;
size_t i;
numlangs = (size_t) [languages count];
for (i = 0; i < numlangs; i++) {
NSString *nsstr = [languages objectAtIndex:i];
size_t len;
char *ptr;
if (nsstr == nil) {
[nsstr getCString:buf maxLength:buflen encoding:NSASCIIStringEncoding];
len = SDL_strlen(buf);
// convert '-' to '_'...
// These are always full lang-COUNTRY, so we search from the back,
// so things like zh-Hant-CN find the right '-' to convert.
if ((ptr = SDL_strrchr(buf, '-')) != NULL) {
*ptr = '_';
if (buflen <= len) {
*buf = '\0'; // drop this one and stop, we can't fit anymore.
buf += len;
buflen -= len;
if (i < (numlangs - 1)) {
if (buflen <= 1) {
break; // out of room, stop looking.
buf[0] = ','; // add a comma between entries.
buf[1] = '\0';
/* vi: set ts=4 sw=4 expandtab: */