+ REGEXP *ret;
+ int i, len, npar;
+ struct reg_substr_datum *s;
+
+ if (!r)
+ return (REGEXP *)NULL;
+
+ if ((ret = (REGEXP *)ptr_table_fetch(PL_ptr_table, r)))
+ return ret;
+
+ len = r->offsets[0];
+ npar = r->nparens+1;
+
+ Newc(0, ret, sizeof(regexp) + (len+1)*sizeof(regnode), char, regexp);
+ Copy(r->program, ret->program, len+1, regnode);
+
+ New(0, ret->startp, npar, I32);
+ Copy(r->startp, ret->startp, npar, I32);
+ New(0, ret->endp, npar, I32);
+ Copy(r->startp, ret->startp, npar, I32);
+
+ New(0, ret->substrs, 1, struct reg_substr_data);
+ for (s = ret->substrs->data, i = 0; i < 3; i++, s++) {
+ s->min_offset = r->substrs->data[i].min_offset;
+ s->max_offset = r->substrs->data[i].max_offset;
+ s->substr = sv_dup_inc(r->substrs->data[i].substr, param);
+ }
+
+ ret->regstclass = NULL;
+ if (r->data) {
+ struct reg_data *d;
+ int count = r->data->count;
+
+ Newc(0, d, sizeof(struct reg_data) + count*sizeof(void *),
+ char, struct reg_data);
+ New(0, d->what, count, U8);
+
+ d->count = count;
+ for (i = 0; i < count; i++) {
+ d->what[i] = r->data->what[i];
+ switch (d->what[i]) {
+ case 's':
+ d->data[i] = sv_dup_inc((SV *)r->data->data[i], param);
+ break;
+ case 'p':
+ d->data[i] = av_dup_inc((AV *)r->data->data[i], param);
+ break;
+ case 'f':
+ /* This is cheating. */
+ New(0, d->data[i], 1, struct regnode_charclass_class);
+ StructCopy(r->data->data[i], d->data[i],
+ struct regnode_charclass_class);
+ ret->regstclass = (regnode*)d->data[i];
+ break;
+ case 'o':
+ /* Compiled op trees are readonly, and can thus be
+ shared without duplication. */
+ d->data[i] = (void*)OpREFCNT_inc((OP*)r->data->data[i]);
+ break;
+ case 'n':
+ d->data[i] = r->data->data[i];
+ break;
+ }
+ }
+
+ ret->data = d;
+ }
+ else
+ ret->data = NULL;
+
+ New(0, ret->offsets, 2*len+1, U32);
+ Copy(r->offsets, ret->offsets, 2*len+1, U32);
+
+ ret->precomp = SAVEPV(r->precomp);
+ ret->refcnt = r->refcnt;
+ ret->minlen = r->minlen;
+ ret->prelen = r->prelen;
+ ret->nparens = r->nparens;
+ ret->lastparen = r->lastparen;
+ ret->lastcloseparen = r->lastcloseparen;
+ ret->reganch = r->reganch;
+
+ ret->sublen = r->sublen;
+
+ if (RX_MATCH_COPIED(ret))
+ ret->subbeg = SAVEPV(r->subbeg);
+ else
+ ret->subbeg = Nullch;
+
+ ptr_table_store(PL_ptr_table, r, ret);
+ return ret;