Chi Hsuan Yen added the comment:
There are some locale strings supported in setlocale():
https://android.googlesource.com/platform/bionic/+/master/libc/bionic/locale.cpp#104.
However, seems mbstowcs just ignores such a setting on Android. Here's an
example:
#include <locale.h>
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#define BUFFER_SIZE 10
void test_mbstowcs()
{
wchar_t dest[BUFFER_SIZE];
memset(dest, 0, sizeof(dest));
printf("mbstowcs: %ld\n", mbstowcs(dest, "中文", BUFFER_SIZE));
printf("dest: %x %x\n", dest[0], dest[1]);
}
int main()
{
printf("setlocale: %d\n", setlocale(LC_ALL, "en_US.UTF-8") != NULL);
test_mbstowcs();
printf("setlocale: %d\n", setlocale(LC_ALL, "C") != NULL);
test_mbstowcs();
return 0;
}
On Linux (glibc 2.24) the result is:
$ ./a.out
setlocale: 1
mbstowcs: 2
dest: 4e2d 6587
setlocale: 1
mbstowcs: -1
dest: 0 0
On Android (6.0 Marshmallow) the result is:
shell@ASUS_Z00E_2:/ $ /data/local/tmp/a.out
setlocale: 1
mbstowcs: 2
dest: 4e2d 6587
setlocale: 1
mbstowcs: 2
dest: 4e2d 6587
A quick search indicates setlocale() affects *scanf functions only, so I guess
it's safe to force UTF-8 in CPython.
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