Setlocale function returns NULL on SLES15

SUSE Linux Enterprise Extensions SUSE Linux Enterprise Server
1

Hi,
I have a C program that uses locales set by environmet using the function setlocale(LC_ALL,""). The locale on SLES15 is set to ja_JP.sjis but setlocale(LC_ALL,"") returns null.
I’ve also checked the following:

  1. Set locale to ja_JP.sjis on SLES12 and it works fine (setlocale return ja_JP.sjis)
  2. Set locale to ja_JP.utf8 on SLES15 and it works fine (setlocale return ja_JP.utf8)
  3. The locale setting is as follows:
    LANG=ja_JP.sjis
    LC_CTYPE=ja_JP.sjis
    LC_NUMERIC=“ja_JP.sjis”
    LC_TIME=“ja_JP.sjis”
    LC_COLLATE=“ja_JP.sjis”
    LC_MONETARY=“ja_JP.sjis”
    LC_MESSAGES=“ja_JP.sjis”
    LC_PAPER=“ja_JP.sjis”
    LC_NAME=“ja_JP.sjis”
    LC_ADDRESS=“ja_JP.sjis”
    LC_TELEPHONE=“ja_JP.sjis”
    LC_MEASUREMENT=“ja_JP.sjis”
    LC_IDENTIFICATION=“ja_JP.sjis”
    LC_ALL=ja_JP.sjis

Does anybody know what cause ja_JP.sjis locale on SLES15 doesn’t work with setlocale function, or are there any changes on locale setting for SLES15?

Thanks and best regards