locale_charset.c:
../../lib/localcharset.c:
locale name    locale charmap   nl_langinfo(CODESET) locale_charset() 

En_US.IBM-850    IBM-850           IBM-850           CP850             
Fr_FR.IBM-850    IBM-850           IBM-850           CP850             
en_US.ISO8859-1  ISO8859-1         ISO8859-1         ISO-8859-1        
fr_FR.ISO8859-1  ISO8859-1         ISO8859-1         ISO-8859-1