nl_langinfo
extern char* nl_langinfo(nl_item item);
codeset = nl_langinfo (CODESET);
external_ccs = nl_langinfo (CODESET);
codeset_name = nl_langinfo (CODESET);
ex = nl_langinfo(AM_STR);
ex = nl_langinfo(PM_STR);
s = strptime(s, nl_langinfo(T_FMT_AMPM), tm);
s = strptime(s, nl_langinfo(D_FMT), tm);
s = strptime(s, nl_langinfo(T_FMT), tm);
ex = nl_langinfo(min+i);
s = strptime(s, nl_langinfo(D_T_FMT), tm);
const char* langinfo = nl_langinfo(i);