+#define SAFE_UTF8_EXPAND(var) \
+STMT_START { \
+ if ((var) > SSize_t_MAX / UTF8_EXPAND) \
+ Perl_croak(aTHX_ "%s", "Out of memory during pack()"); \
+ (var) = (var) * UTF8_EXPAND; \
+} STMT_END
+
+#define GROWING2(utf8, cat, start, cur, item_size, item_count) \
+STMT_START { \
+ if (SSize_t_MAX / (item_size) < (item_count)) \
+ Perl_croak(aTHX_ "%s", "Out of memory during pack()"); \
+ GROWING((utf8), (cat), (start), (cur), (item_size) * (item_count)); \
+} STMT_END
+