xref: /aosp_15_r20/external/musl/src/prng/rand_r.c (revision c9945492fdd68bbe62686c5b452b4dc1be3f8453) 
1*c9945492SAndroid Build Coastguard Worker #include <stdlib.h>
2*c9945492SAndroid Build Coastguard Worker 
temper(unsigned x)3*c9945492SAndroid Build Coastguard Worker static unsigned temper(unsigned x)
4*c9945492SAndroid Build Coastguard Worker {
5*c9945492SAndroid Build Coastguard Worker 	x ^= x>>11;
6*c9945492SAndroid Build Coastguard Worker 	x ^= x<<7 & 0x9D2C5680;
7*c9945492SAndroid Build Coastguard Worker 	x ^= x<<15 & 0xEFC60000;
8*c9945492SAndroid Build Coastguard Worker 	x ^= x>>18;
9*c9945492SAndroid Build Coastguard Worker 	return x;
10*c9945492SAndroid Build Coastguard Worker }
11*c9945492SAndroid Build Coastguard Worker 
rand_r(unsigned * seed)12*c9945492SAndroid Build Coastguard Worker int rand_r(unsigned *seed)
13*c9945492SAndroid Build Coastguard Worker {
14*c9945492SAndroid Build Coastguard Worker 	return temper(*seed = *seed * 1103515245 + 12345)/2;
15*c9945492SAndroid Build Coastguard Worker }
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