#include <fontconfig.h>
FcFontSet * FcFontSetList(FcConfig *config, FcFontSet **sets, intnsets, FcPattern *pattern, FcObjectSet *object_set);
FcFontSet * FcFontSetList
Selects fonts matching pattern from sets, creates patterns from those fonts containing only the objects in object_set and returns the set of unique such patterns.
Fontconfig version 2.6.0