- if (length > blen_chars - offset)
- length = blen_chars - offset;
- if (doing_utf8) {
- /* Here we convert length from characters to bytes. */
- if (tmpbuf || SvGMAGICAL(bufsv) || SvAMAGIC(bufsv)) {
- /* Either we had to convert the SV, or the SV is magical, or
- the SV has overloading, in which case we can't or mustn't
- or mustn't call it again. */
-
- buffer = (const char*)utf8_hop((const U8 *)buffer, offset);
- length = utf8_hop((U8 *)buffer, length) - (U8 *)buffer;
- } else {
- /* It's a real UTF-8 SV, and it's not going to change under
- us. Take advantage of any cache. */
- I32 start = offset;
- I32 len_I32 = length;
-
- /* Convert the start and end character positions to bytes.
- Remember that the second argument to sv_pos_u2b is relative
- to the first. */
- sv_pos_u2b(bufsv, &start, &len_I32);
-
- buffer += start;
- length = len_I32;
- }
- }
- else {
- buffer = buffer+offset;
- }
+ if (length > blen - offset)
+ length = blen - offset;
+ buffer = buffer+offset;
+