cc75a8450a
A lot of this was pulled from core-lightning. Not sure what is actually needed or not. Signed-off-by: William Casarin <jb55@jb55.com>
44 lines
867 B
C
44 lines
867 B
C
#ifndef LIGHTNING_COMMON_OVERFLOWS_H
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#define LIGHTNING_COMMON_OVERFLOWS_H
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#include "../config.h"
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#include "short_types.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_u64(uint64_t a, uint64_t b)
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{
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uint64_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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static inline bool assign_overflow_u8(u8 *dst, uint64_t v)
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{
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*dst = v;
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return *dst == v;
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}
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static inline bool assign_overflow_u16(u16 *dst, uint64_t v)
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{
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*dst = v;
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return *dst == v;
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}
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static inline bool assign_overflow_u32(u32 *dst, uint64_t v)
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{
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*dst = (u32)v;
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return *dst == v;
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}
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#endif /* LIGHTNING_COMMON_OVERFLOWS_H */
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