+
+/*
+ * Inspects the SV indicated by svp, and returns a null pointer if
+ * it's an undefined value, or a string allocation from `stream'
+ * otherwise. Using this when filling in addinfo avoids those
+ * irritating "Use of uninitialized value in subroutine entry"
+ * warnings from Perl.
+ */
+char *string_or_undef(SV **svp, ODR stream) {
+ STRLEN len;
+ char *ptr, *buf;
+
+ if (!SvOK(*svp))
+ return 0;
+
+ ptr = SvPV(*svp, len);
+ buf = (char*) odr_malloc(stream, len+1);
+ strcpy(buf, ptr);
+ return buf;
+}
+
+