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| author | Vladimir Azarov <avm@intermediate-node.net> | 2024-10-01 15:47:05 +0200 |
|---|---|---|
| committer | Vladimir Azarov <avm@intermediate-node.net> | 2024-10-01 15:47:05 +0200 |
| commit | 4abab5ad6c8465a7528ccdd5f49367da05f78bbd (patch) | |
| tree | ebf009bf1376a5a223a915bc27cbbd791a1316bc /src/prng/rand_r.c | |
Initial version
Diffstat (limited to 'src/prng/rand_r.c')
| -rw-r--r-- | src/prng/rand_r.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/src/prng/rand_r.c b/src/prng/rand_r.c new file mode 100644 index 0000000..638614c --- /dev/null +++ b/src/prng/rand_r.c @@ -0,0 +1,15 @@ +#include <stdlib.h> + +static unsigned temper(unsigned x) +{ + x ^= x>>11; + x ^= x<<7 & 0x9D2C5680; + x ^= x<<15 & 0xEFC60000; + x ^= x>>18; + return x; +} + +int rand_r(unsigned *seed) +{ + return temper(*seed = *seed * 1103515245 + 12345)/2; +} |