ref: f11139d4c918802a87730bc14d094670ee4ce572
dir: /libsec/nfastrand.c/
#include "os.h" #include <libsec.h> #define Maxrand ((1UL<<31)-1) ulong nfastrand(ulong n) { ulong m, r; /* * set m to the maximum multiple of n <= 2^31-1 * so we want a random number < m. */ if(n > Maxrand) sysfatal("nfastrand: n too large"); m = Maxrand - Maxrand % n; while((r = fastrand()) >= m) ; return r%n; }