*/
+#include <string.h>
+#include <assert.h>
#include "rand.h"
#include "../hash.h"
-struct frand_state __fio_rand_state;
-
static inline int __seed(unsigned int x, unsigned int m)
{
return (x < m) ? x + m : x;
}
}
-unsigned long fill_random_buf(void *buf, unsigned int len)
+unsigned long fill_random_buf(struct frand_state *fs, void *buf,
+ unsigned int len)
{
- unsigned long r = __rand(&__fio_rand_state);
+ unsigned long r = __rand(fs);
if (sizeof(int) != sizeof(long *))
- r *= (unsigned long) __rand(&__fio_rand_state);
+ r *= (unsigned long) __rand(fs);
__fill_random_buf(buf, len, r);
return r;
}
+
+unsigned long fill_random_buf_percentage(struct frand_state *fs, void *buf,
+ unsigned int percentage,
+ unsigned int segment, unsigned int len)
+{
+ unsigned int this_len, rep_len;
+ unsigned long r = __rand(fs);
+
+ assert(segment <= len);
+
+ if (sizeof(int) != sizeof(long *))
+ r *= (unsigned long) __rand(fs);
+
+ while (len) {
+ /*
+ * Fill random chunk
+ */
+ this_len = (segment * (100 - percentage)) / 100;
+ if (this_len > len)
+ this_len = len;
+
+ __fill_random_buf(buf, this_len, r);
+
+ len -= this_len;
+ buf += this_len;
+
+ /*
+ * Now duplicate random chunk in rest of buf
+ */
+ rep_len = segment - this_len;
+ if (rep_len > len)
+ rep_len = len;
+
+ memcpy(buf, buf + rep_len, rep_len);
+ buf += rep_len;
+ len -= rep_len;
+ }
+
+ return r;
+}