Diff: pubnub_generate_uuid_v4_random_std.cpp

Revision:

2:9c3ddeede137

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/pubnub_generate_uuid_v4_random_std.cpp	Fri Nov 11 22:45:51 2016 +0000
@@ -0,0 +1,25 @@
+#include "pubnub_generate_uuid.h"
+
+#include <stdlib.h>
+
+
+int pubnub_generate_uuid_v4_random(struct Pubnub_UUID *uuid)
+{
+    /* This uses the standard rand() function, which is, in most 
+       implementations, not a very good random number generator (RNG). So,
+       if you have a better RNG, please don't use this function. Also, it is
+       essential that you call srand() with a good seed at least once in your
+       program, otherwise your "random" numbers won't be so random after all.
+       */
+    int *p;
+    for (p = (int*)uuid; p < (int*)(uuid + 1); ++p) {
+        *p = rand();
+    }
+  
+    uuid->uuid[6] &= 0x0F;
+    uuid->uuid[6] |= 0x40;
+    uuid->uuid[8] &= 0x3F;
+    uuid->uuid[8] |= 0x80;
+
+    return 0;
+}
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