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overflows: helpers for integer assignment overflows.

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Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
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Rusty Russell 2021-07-11 16:29:42 +09:30 committed by neil saitug
parent dd00d4dcf8
commit 888774e2ad
1 changed files with 19 additions and 0 deletions
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19
common/overflows.h
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@ -1,6 +1,7 @@
#ifndef LIGHTNING_COMMON_OVERFLOWS_H
#define LIGHTNING_COMMON_OVERFLOWS_H
#include "config.h"
#include <ccan/short_types/short_types.h>
static inline bool add_overflows_size_t(uint64_t a, uint64_t b)
{
@ -21,4 +22,22 @@ static inline bool mul_overflows_u64(uint64_t a, uint64_t b)
ret = a * b;
return (ret / a != b);
}
static inline bool assign_overflow_u8(u8 *dst, uint64_t v)
{
*dst = v;
return *dst == v;
}
static inline bool assign_overflow_u16(u16 *dst, uint64_t v)
{
*dst = v;
return *dst == v;
}
static inline bool assign_overflow_u32(u32 *dst, uint64_t v)
{
*dst = v;
return *dst == v;
}
#endif /* LIGHTNING_COMMON_OVERFLOWS_H */