github.com/afumu/libc@v0.0.6/musl/src/prng/rand.c (about)

     1  #include <stdlib.h>
     2  #include <stdint.h>
     3  
     4  static uint64_t seed;
     5  
     6  void srand(unsigned s)
     7  {
     8  	seed = s-1;
     9  }
    10  
    11  int rand(void)
    12  {
    13  	seed = 6364136223846793005ULL*seed + 1;
    14  	return seed>>33;
    15  }