foptname failed to return value when filename contains MBCS

[whymath]

When using function foptname and filename contains Chinese character, it failed to return value. The prerequisites are:

1. Windows OS;

2. SAS 9.4 M8;

3. UTF-8 encoded SAS session;

And the active code page of my Windows OS is 936, which means simplified Chinese, a friend think this could be related.

Using foptname and finfo to get file attributes, with English file name:

filename _dummy_ "C:\Profiles\Work\temp\hello.sas";
data _null_;
 fid=fopen('_dummy_');
 if fid then do;
   do i=1 to foptnum(fid);
     foptname=foptname(fid,i);
     finfo=finfo(fid,foptname);
     put foptname ":" finfo;
   end;
   fid=fclose(fid);
 end;
run;

Log:

文件名 :C:\Profiles\Work\temp\hello.sas
RECFM :V
LRECL :32767
文件大小（字节） :634
上次修改时间 :2024年05月16日 10时06分17秒
创建时间 :2024年05月16日 10时06分17秒

The output is cool.

With Chinese file name:

filename _dummy_ "C:\Profiles\Work\temp\你好.sas";
data _null_;
 fid=fopen('_dummy_');
 if fid then do;
   do i=1 to foptnum(fid);
     foptname=foptname(fid,i);
     finfo=finfo(fid,foptname);
     put foptname ":" finfo;
   end;
   fid=fclose(fid);
 end;
run;

Log:

文件名 :C:\Profiles\Work\temp\你好.sas
RECFM :V
LRECL :32767
  :
  :
  :

Missing the last 3 output.

With Janpenese file name:

filename _dummy_ "C:\Profiles\Work\temp\こんにちは.sas";
data _null_;
 fid=fopen('_dummy_');
 if fid then do;
   do i=1 to foptnum(fid);
     foptname=foptname(fid,i);
     finfo=finfo(fid,foptname);
     put foptname ":" finfo;
   end;
   fid=fclose(fid);
 end;
run;

Log:

文件名 :C:\Profiles\Work\temp\こんにちは.sas
RECFM :V
LRECL :32767
  :
  :
  :

Missing the last 3 output.

Why I cann't get right output when filename contains MBCS? Is there a robust way to get file attributes regardless of the encoding or OS? Thanks in advance.

PS1: Under euc-cn(whichc means simplified Chinese) encoded SAS session, Windows OS, the problem just disappear.

PS2: Under utf-8 encoded SAS session, Linux OS, the problem just disappear.

[Kurt_Bremser]

Open a track with SAS technical support. But since the return of FOPTNUM, FOPTNAME and FINFO is OS-dependent, this might be a fault in Windows itself.

[SASKiwi]

What's your SAS LOCALE settings for these tests? You can check using this code:

proc options option = locale;
run;

[whymath]

Thank you, it is ZH_CN