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Diffstat (limited to '')
-rw-r--r-- | module/hnh/util/uuid.scm | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/module/hnh/util/uuid.scm b/module/hnh/util/uuid.scm new file mode 100644 index 00000000..68455243 --- /dev/null +++ b/module/hnh/util/uuid.scm @@ -0,0 +1,19 @@ +(define-module (hnh util uuid) + :use-module (ice-9 format) + :export (uuid uuid-v4)) + +(define %seed (random-state-from-platform)) + +(define (uuid-v4) + (define version 4) + (define variant #b10) + (format #f "~8'0x-~4'0x-~4'0x-~4'0x-~12'0x" + (random (ash 1 (* 4 8)) %seed) + (random (ash 1 (* 4 4)) %seed) + (logior (ash version (* 4 3)) + (random (1- (ash 1 (* 4 3))) %seed)) + (logior (ash variant (+ 2 (* 4 3))) + (random (ash 1 (+ 2 (* 4 3))) %seed)) + (random (ash 1 (* 4 12)) %seed))) + +(define uuid uuid-v4) |