stew

commit 42fd665a4cce3cc0123263270a84ae69b0b35f5d
parent 1aa158f02842a44910960564e50f068ee5ab7f29
Author: Renev Pavel <an2qzavok@gmail.com>
Date:   Fri, 28 Oct 2022 11:05:56 +0000

src/uuid

Diffstat:
A
src/uuid/6.out
 | 
0

A
src/uuid/mkfile
 | 
7
+++++++
A
src/uuid/uuid.6
 | 
0

A
src/uuid/uuid.c
 | 
50
++++++++++++++++++++++++++++++++++++++++++++++++++

4 files changed, 57 insertions(+), 0 deletions(-)
diff --git a/src/uuid/6.out b/src/uuid/6.out
Binary files differ.
diff --git a/src/uuid/mkfile b/src/uuid/mkfile
@@ -0,0 +1,7 @@
+</$objtype/mkfile
+
+BIN=
+TARG=uuid
+OFILES=uuid.$O
+
+</sys/src/cmd/mkone
diff --git a/src/uuid/uuid.6 b/src/uuid/uuid.6
Binary files differ.
diff --git a/src/uuid/uuid.c b/src/uuid/uuid.c
@@ -0,0 +1,50 @@
+#include <u.h>
+#include <libc.h>
+#include <libsec.h>
+
+/*
+ * simple random uuid generator
+ */
+
+struct UUID {
+	u32int tl; // time_low
+	u16int tm; // time_mid
+	u16int th; // time_hi_and_version
+	u8int sh; // clock_seq_hi_and_reserved
+	u8int sl; // clock_seq_low
+	u8int nd[6]; // node
+} uuid;
+
+void
+usage(void)
+{
+	fprint(2, "usage: %s\n", argv0);
+	exits("usage");
+}
+
+void
+main(int argc, char **argv)
+{
+	ARGBEGIN{
+	default:
+		usage();
+	} ARGEND
+	if (argc != 0) usage();
+
+	genrandom((uchar *)(&uuid), sizeof(uuid));
+
+	// mask 1001 1111, data 0010 0000
+	uuid.sh = uuid.sh & 0x60 | 0x20;
+
+	// mask 0000 1111 1111 1111
+	// data 0100 0000 0000 0000
+	uuid.th = uuid.th & 0x0fff | 0x4000;
+
+	print("%08ux-%04uhx-%04uhx-%02uhhx%02uhhx-", uuid.tl, uuid.tm, uuid.th, uuid.sh, uuid.sl);
+
+	int i;
+
+	for (i = 0; i < 6; i++) print("%02uhhx", uuid.nd[i]);
+
+	print("\n");
+}