ref: 1aa79968bbf19af6d6b9043b6fe841369550eff4
dir: /libsec/port/nfastrand.c/
#include "os.h" #include <libsec.h> #define Maxrand ((1UL<<31)-1) u32 nfastrand(u32 n) { u32 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; }