+STRLEN
+sv_len_utf8(register SV *sv)
+{
+ U8 *s;
+ U8 *send;
+ STRLEN len;
+
+ if (!sv)
+ return 0;
+
+#ifdef NOTYET
+ if (SvGMAGICAL(sv))
+ len = mg_length(sv);
+ else
+#endif
+ s = (U8*)SvPV(sv, len);
+ send = s + len;
+ len = 0;
+ while (s < send) {
+ s += UTF8SKIP(s);
+ len++;
+ }
+ return len;
+}
+
+void
+sv_pos_u2b(register SV *sv, I32* offsetp, I32* lenp)
+{
+ U8 *start;
+ U8 *s;
+ U8 *send;
+ I32 uoffset = *offsetp;
+ STRLEN len;
+
+ if (!sv)
+ return;
+
+ start = s = (U8*)SvPV(sv, len);
+ send = s + len;
+ while (s < send && uoffset--)
+ s += UTF8SKIP(s);
+ if (s >= send)
+ s = send;
+ *offsetp = s - start;
+ if (lenp) {
+ I32 ulen = *lenp;
+ start = s;
+ while (s < send && ulen--)
+ s += UTF8SKIP(s);
+ if (s >= send)
+ s = send;
+ *lenp = s - start;
+ }
+ return;
+}
+
+void
+sv_pos_b2u(register SV *sv, I32* offsetp)
+{
+ U8 *s;
+ U8 *send;
+ STRLEN len;
+
+ if (!sv)
+ return;
+
+ s = (U8*)SvPV(sv, len);
+ if (len < *offsetp)
+ croak("panic: bad byte offset");
+ send = s + *offsetp;
+ len = 0;
+ while (s < send) {
+ s += UTF8SKIP(s);
+ ++len;
+ }
+ if (s != send) {
+ warn("Malformed UTF-8 character");
+ --len;
+ }
+ *offsetp = len;
+ return;
+}
+