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26a03acfd0
Simple routing topology, and ability to ask about the cheapest route. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
25 lines
482 B
C
25 lines
482 B
C
#ifndef LIGHTNING_OVERFLOWS_H
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#define LIGHTNING_OVERFLOWS_H
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#include "config.h"
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static inline bool add_overflows_size_t(uint64_t a, uint64_t b)
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{
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return (size_t)a != a || (size_t)b != b || (a + b) < (size_t)a;
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}
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static inline bool add_overflows_u64(uint64_t a, uint64_t b)
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{
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return (a + b) < a;
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}
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static inline bool mul_overflows_s64(int64_t a, int64_t b)
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{
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int64_t ret;
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if (a == 0)
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return false;
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ret = a * b;
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return (ret / a != b);
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}
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#endif /* LIGHTNING_OVERFLOWS_H */
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