/*
* Generate a random value between 'start' and 'end', both inclusive
*/
-static inline int rand32_between(struct frand_state *state, int start, int end)
+static inline uint32_t rand32_upto(struct frand_state *state, uint32_t end)
{
uint32_t r;
assert(!state->use64);
r = __rand32(&state->state32);
- return start + (int) ((double)end * (r / (FRAND32_MAX + 1.0)));
+ return (int) ((double)end * (r / (FRAND32_MAX + 1.0)));
}
-static inline uint64_t rand64_between(struct frand_state *state, uint64_t start,
- uint64_t end)
+static inline uint64_t rand64_upto(struct frand_state *state, uint64_t end)
{
uint64_t r;
+ assert(state->use64);
+
r = __rand64(&state->state64);
- return start + (uint64_t) ((double)end * (r / (FRAND64_MAX + 1.0)));
+ return (uint64_t) ((double)end * (r / (FRAND64_MAX + 1.0)));
}
static inline uint64_t rand_between(struct frand_state *state, uint64_t start,
uint64_t end)
{
if (state->use64)
- return rand32_between(state, start, end);
+ return start + rand64_upto(state, end - start);
else
- return rand64_between(state, start, end);
+ return start + rand32_upto(state, end - start);
}
extern void init_rand(struct frand_state *, bool);