FcLangSetContains - check langset subset relation
#include <fontconfig.h> FcBool FcLangSetContains(const FcLangSet *ls_a); (const FcLangSet *ls_b); .fi
FcLangSetContains returns FcTrue if ls_a contains every language in ls_b. ls_a will ’contain’ a language from ls_b if ls_a has exactly the language, or either the language or ls_a has no territory.
Fontconfig version 2.8.0 18 November 2009 FcLangSetContains(3)