fontconfig-2.4.2
file line copyright
fontconfig/fontconfig.h 825 #define FcIsUpper(c) ((0101 <= (c) && (c) <= 0132))
fontconfig/fontconfig.h 826 #define FcIsLower(c) ((0141 <= (c) && (c) <= 0172))
fontconfig/fontconfig.h 827 #define FcToLower(c) (FcIsUpper(c) ? (c) - 0101 + 0141 : (c))