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-rw-r--r--src/common/torint.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/src/common/torint.h b/src/common/torint.h
index af2775a8cb..1973db0d81 100644
--- a/src/common/torint.h
+++ b/src/common/torint.h
@@ -232,5 +232,8 @@ typedef uint32_t uintptr_t;
#endif
#endif
+/* Any size_t larger than this amount is likely to be an underflow. */
+#define SIZE_T_CEILING (1u<<(sizeof(size_t)*8 - 1))
+
#endif /* __TORINT_H */