Hello, after looking at this (https://sourceware.org/bugzilla/show_bug.cgi?id=17577) bug report I found out small improvement can be made to _IO_str_init_static_internal function. Wide string equivalent function (https://elixir.bootlin.com/glibc/glibc-2.42.9000/source/libio/wstrops.c#L41) is using __wcslen.