#include <fontconfig/fontconfig.h>
FcChar32 FcCharSetNextPage (const FcCharSet *a, FcChar32[FC_CHARSET_MAP_SIZE] map, FcChar32 *next);
Builds an array of bits in map marking the Unicode coverage of a for page containing *next (see the FcCharSetFirstPage description for details). *next is set to contains the base code point for the next page in a. Returns the base of code point for the page, or FC_CHARSET_DONE if a does not contain *next.