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.
34 lines
631 B
34 lines
631 B
#ifndef LIGHTNING_OVERFLOWS_H
|
|
#define LIGHTNING_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_OVERFLOWS_H */
|
|
|