https://docs.oracle.com/cd/E88353_01/html/E37843/wcsxfrm-3c.html
wcsxfrm - man pages section 3: Basic Library Functions
wcsxfrm , wcsxfrm_l , wsxfrm - wide character string transformation The wcsxfrm() and wcsxfrm() functions transform the wide character string pointed to by ws2...
man pagessectionbasiclibraryfunctions