PERL_CALLCONV UV Perl_utf8n_to_uvuni(pTHX_ U8 *s, STRLEN curlen, STRLEN* retlen, U32 flags);
PERL_CALLCONV U8* Perl_uvchr_to_utf8(pTHX_ U8 *d, UV uv);
PERL_CALLCONV U8* Perl_uvuni_to_utf8(pTHX_ U8 *d, UV uv);
+PERL_CALLCONV U8* Perl_uvchr_to_utf8_flags(pTHX_ U8 *d, UV uv, UV flags);
+PERL_CALLCONV U8* Perl_uvuni_to_utf8_flags(pTHX_ U8 *d, UV uv, UV flags);
PERL_CALLCONV char* Perl_pv_uni_display(pTHX_ SV *dsv, U8 *spv, STRLEN len, STRLEN pvlim, UV flags);
PERL_CALLCONV char* Perl_sv_uni_display(pTHX_ SV *dsv, SV *ssv, STRLEN pvlim, UV flags);
PERL_CALLCONV void Perl_vivify_defelem(pTHX_ SV* sv);