From 4acbc996634bd2292230b13a4a67b968cb9055d2 Mon Sep 17 00:00:00 2001
From: Matthias Schiffer <mschiffer@universe-factory.net>
Date: Mon, 18 Mar 2013 23:38:04 +0100
Subject: Add random functions

---
 include/gmrf/gmrf.h |  1 +
 mmss/mmss.c         | 10 +++++++++-
 mmss/mmss.h         |  2 ++
 3 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/include/gmrf/gmrf.h b/include/gmrf/gmrf.h
index 06427fb..c0a36ea 100644
--- a/include/gmrf/gmrf.h
+++ b/include/gmrf/gmrf.h
@@ -56,6 +56,7 @@ static inline bool gmrf_addr_equal(const gmrf_addr_t *addr1, const gmrf_addr_t *
 }
 
 gmrf_time_t gmrf_now(gmrf_t *gmrf);
+void gmrf_random_bytes(gmrf_t *gmrf, void *buffer, size_t len);
 void gmrf_logf(gmrf_t *gmrf, int priority, const char *format, ...);
 
 gmrf_addr_t gmrf_iface_get_addr(gmrf_t *gmrf, gmrf_iface_t *iface);
diff --git a/mmss/mmss.c b/mmss/mmss.c
index ebfae1c..a046364 100644
--- a/mmss/mmss.c
+++ b/mmss/mmss.c
@@ -35,6 +35,14 @@ gmrf_time_t gmrf_now(gmrf_t *gmrf) {
 	return gmrf->mmss->now;
 }
 
+void gmrf_random_bytes(gmrf_t *gmrf, void *buffer, size_t len) {
+	uint8_t *data = buffer;
+
+	size_t i;
+	for (i = 0; i < len; i++)
+		data[i] = rand_r(&gmrf->rand_seed);
+}
+
 
 static void init_nodes(gmrf_t *nodes) {
 	gmrf_t *node;
@@ -72,7 +80,7 @@ int main(int argc, char *argv[]) {
 	mmss_t mmss = { .now = 0 };
 
 	mmss_network_t net = { .mtu = 1500 };
-	gmrf_t node1 = { .name = "node1", .mmss = &mmss, .proto = proto }, node2 = { .name = "node2", .mmss = &mmss, .proto = proto };
+	gmrf_t node1 = { .name = "node1", .mmss = &mmss, .rand_seed = 1, .proto = proto }, node2 = { .name = "node2", .mmss = &mmss, .rand_seed = 2, .proto = proto };
 
 	node2.next = &node1;
 	gmrf_t *nodes = &node2;
diff --git a/mmss/mmss.h b/mmss/mmss.h
index 728bc3c..4b0e206 100644
--- a/mmss/mmss.h
+++ b/mmss/mmss.h
@@ -73,6 +73,8 @@ struct gmrf {
 	gmrf_context_t *ctx;
 	gmrf_iface_t *interfaces;
 
+	unsigned rand_seed;
+
 	const mmss_protocol_t *proto;
 };
 
-- 
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