You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.

35 lines
652 B

#ifndef LIGHTNING_COMMON_OVERFLOWS_H
#define LIGHTNING_COMMON_OVERFLOWS_H
#include "config.h"
static inline bool add_overflows_size_t(uint64_t a, uint64_t b)
{
return (size_t)a != a || (size_t)b != b || (a + b) < (size_t)a;
}
static inline bool add_overflows_u64(uint64_t a, uint64_t b)
{
return (a + b) < a;
}
static inline bool mul_overflows_s64(int64_t a, int64_t b)
{
int64_t ret;
if (a == 0)
return false;
ret = a * b;
return (ret / a != b);
}
static inline bool mul_overflows_u64(uint64_t a, uint64_t b)
{
uint64_t ret;
if (a == 0)
return false;
ret = a * b;
return (ret / a != b);
}
#endif /* LIGHTNING_COMMON_OVERFLOWS_H */