More cleanups

11 files changed, 316 insertions, 181 deletions

diff --git a/mmss/CMakeLists.txt b/mmss/CMakeLists.txt
index 047e348..04ac405 100644
--- a/mmss/CMakeLists.txt
+++ b/mmss/CMakeLists.txt
@@ -5,6 +5,7 @@ BISON_TARGET(mmss_config_parse config.y ${CMAKE_CURRENT_BINARY_DIR}/config.yy.cp
 
 add_executable(mmss
   config.cpp
+  gmrf.cpp
   iface.cpp
   log.cpp
   mmss.cpp
diff --git a/mmss/config.cpp b/mmss/config.cpp
index 529e9b1..4492ffd 100644
--- a/mmss/config.cpp
+++ b/mmss/config.cpp
@@ -40,13 +40,12 @@ namespace Config {
 void add_network(context_t *mmss, config_t *conf, const char *name) {
 	logf(mmss, LOG_NOTICE, "adding network `%s'", name);
 
-	network_t *net = new network_t;
+	std::shared_ptr<network_t> net = std::make_shared<network_t>();
 
-	net->name = strdup(name);
+	net->name = name;
 	net->mtu = 1500;
 
-	net->next = conf->networks;
-	conf->networks = net;
+	conf->network.push_back(net);
 }
 
 }
diff --git a/mmss/gmrf.cpp b/mmss/gmrf.cpp
new file mode 100644
index 0000000..d6eecbc
--- /dev/null
+++ b/mmss/gmrf.cpp
@@ -0,0 +1,143 @@
+/*
+  Copyright (c) 2013, Matthias Schiffer <mschiffer@universe-factory.net>
+  All rights reserved.
+
+  Redistribution and use in source and binary forms, with or without
+  modification, are permitted provided that the following conditions are met:
+
+    1. Redistributions of source code must retain the above copyright notice,
+       this list of conditions and the following disclaimer.
+    2. Redistributions in binary form must reproduce the above copyright notice,
+       this list of conditions and the following disclaimer in the documentation
+       and/or other materials provided with the distribution.
+
+  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+  DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+  DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+  SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+  CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+  OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+  OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+
+#include "mmss.hpp"
+#include "util.hpp"
+
+#include <cassert>
+
+
+extern "C" {
+
+gmrf_addr_t gmrf_iface_get_addr(gmrf_t *gmrf, gmrf_iface_t *iface) {
+	return iface->address;
+}
+
+const char* gmrf_iface_get_name(gmrf_t *gmrf, gmrf_iface_t *iface) {
+	return iface->name.c_str();
+}
+
+size_t gmrf_iface_get_mtu(gmrf_t *gmrf, gmrf_iface_t *iface) {
+	auto net = iface->net.lock();
+	if (!net)
+		return 0;
+
+	return net->mtu;
+}
+
+bool gmrf_iface_send(gmrf_t *gmrf, gmrf_iface_t *iface, const void *data, size_t len, const gmrf_addr_t *dest) {
+	auto src_iface = iface->iface.lock();
+	assert(src_iface);
+
+	auto net = src_iface->net.lock();
+	if (!net)
+		return false;
+
+	for (auto dest_iface : net->interfaces) {
+		if (gmrf_addr_equal(&dest_iface->address, dest)) {
+			MMSS::enqueue(gmrf->mmss, src_iface, dest_iface, data, len);
+			break;
+		}
+	}
+
+	return true;
+}
+
+bool gmrf_iface_send_bc(gmrf_t *gmrf, gmrf_iface_t *iface, const void *data, size_t len) {
+	auto src_iface = iface->iface.lock();
+	assert(src_iface);
+
+	auto net = src_iface->net.lock();
+	if (!net)
+		return false;
+
+	for (auto dest_iface : net->interfaces) {
+		if (dest_iface != src_iface)
+			MMSS::enqueue(gmrf->mmss, src_iface, dest_iface, data, len);
+	}
+
+	return true;
+}
+
+void gmrf_schedule(gmrf_t *gmrf, gmrf_scheduled_func f, void *arg, unsigned delay) {
+	auto node = gmrf->node.lock();
+	assert(node);
+
+	std::shared_ptr<MMSS::scheduled_t> scheduled = std::make_shared<MMSS::scheduled_t>();
+
+	scheduled->node = node;
+	scheduled->f = f;
+	scheduled->arg = arg;
+
+	gmrf->mmss->scheduled_queue.put(scheduled, gmrf->mmss->now+delay);
+}
+
+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 = reinterpret_cast<uint8_t*>(buffer);
+
+	size_t i;
+	for (i = 0; i < len; i++)
+		data[i] = rand_r(&gmrf->rand_seed);
+}
+
+static inline const char* get_log_prefix(int log_level) {
+	switch(log_level) {
+	case LOG_CRIT:
+		return "Fatal: ";
+	case LOG_ERR:
+		return "Error: ";
+	case LOG_WARNING:
+		return "Warning: ";
+	case LOG_NOTICE:
+		return "Info: ";
+	case LOG_INFO:
+		return "Verbose: ";
+	case LOG_DEBUG:
+		return "DEBUG: ";
+	default:
+		return "";
+	}
+}
+
+void gmrf_logf(gmrf_t *gmrf, int priority, const char *format, ...) {
+	char buf[1024];
+	size_t pos = 0;
+
+	pos += MMSS::snprintf_safe(buf, sizeof(buf), "%s: %s", gmrf->name.c_str(), get_log_prefix(priority));
+
+	va_list ap;
+	va_start(ap, format);
+	vsnprintf(buf+pos, sizeof(buf)-pos, format, ap);
+	va_end(ap);
+
+	MMSS::logf(gmrf->mmss, priority, "%s", buf);
+}
+
+}
diff --git a/mmss/iface.cpp b/mmss/iface.cpp
index e25eccd..602daa2 100644
--- a/mmss/iface.cpp
+++ b/mmss/iface.cpp
@@ -32,29 +32,34 @@
 namespace MMSS {
 
 void dispatch(std::shared_ptr<packet_t> packet) {
-	packet->dest->node->proto->handle_packet(packet->dest->node, packet->dest->node->ctx, packet->dest,
-						 &packet->source->address, packet->data.get(), packet->len);
+	auto source = packet->source.lock();
+	auto dest = packet->dest.lock();
+	if (!source || !dest)
+		return;
+
+	auto node = dest->node.lock();
+	if (!node)
+		return;
+
+	node->proto->handle_packet(node.get(), node->ctx, dest.get(), &source->address, packet->data.get(), packet->len);
 }
 
-void add_iface(gmrf_t *node, network_t *net, const char *name, const gmrf_addr_t *address) {
-	gmrf_iface_t *iface = new gmrf_iface_t;
+void add_iface(std::shared_ptr<node_t> node, std::shared_ptr<network_t> net, const std::string &name, const gmrf_addr_t *address) {
+	std::shared_ptr<iface_t> iface = iface_t::create();
 
-	iface->name = strdup(name);
+	iface->name = name;
 	iface->address = *address;
 
 	iface->node = node;
 	iface->net = net;
 
-	iface->node_next = node->interfaces;
-	node->interfaces = iface;
+	node->interfaces.push_back(iface);
+	net->interfaces.push_back(iface);
 
-	iface->network_next = net->interfaces;
-	net->interfaces = iface;
-
-	node->proto->add_iface(node, node->ctx, iface);
+	node->proto->add_iface(node.get(), node->ctx, iface.get());
 }
 
-static void enqueue(context_t *mmss, gmrf_iface_t *source, gmrf_iface_t *dest, const void *data, size_t len) {
+void enqueue(context_t *mmss, std::shared_ptr<iface_t> source, std::shared_ptr<iface_t> dest, const void *data, size_t len) {
 	std::shared_ptr<packet_t> packet = std::make_shared<packet_t>();
 
 	packet->sent = mmss->now;
@@ -69,38 +74,3 @@ static void enqueue(context_t *mmss, gmrf_iface_t *source, gmrf_iface_t *dest, c
 }
 
 }
-
-
-gmrf_addr_t gmrf_iface_get_addr(gmrf_t *gmrf, gmrf_iface_t *iface) {
-	return iface->address;
-}
-
-const char* gmrf_iface_get_name(gmrf_t *gmrf, gmrf_iface_t *iface) {
-	return iface->name;
-}
-
-size_t gmrf_iface_get_mtu(gmrf_t *gmrf, gmrf_iface_t *iface) {
-	return iface->net->mtu;
-}
-
-bool gmrf_iface_send(gmrf_t *gmrf, gmrf_iface_t *iface, const void *data, size_t len, const gmrf_addr_t *dest) {
-	gmrf_iface_t *dest_iface;
-	for (dest_iface = iface->net->interfaces; dest_iface; dest_iface = dest_iface->network_next) {
-		if (gmrf_addr_equal(&dest_iface->address, dest)) {
-			MMSS::enqueue(gmrf->mmss, iface, dest_iface, data, len);
-			break;
-		}
-	}
-
-	return true;
-}
-
-bool gmrf_iface_send_bc(gmrf_t *gmrf, gmrf_iface_t *iface, const void *data, size_t len) {
-	gmrf_iface_t *dest_iface;
-	for (dest_iface = iface->net->interfaces; dest_iface; dest_iface = dest_iface->network_next) {
-		if (dest_iface != iface)
-			enqueue(gmrf->mmss, iface, dest_iface, data, len);
-	}
-
-	return true;
-}
diff --git a/mmss/log.cpp b/mmss/log.cpp
index 029b1d6..b66cf6f 100644
--- a/mmss/log.cpp
+++ b/mmss/log.cpp
@@ -25,41 +25,10 @@
 
 
 #include "mmss.hpp"
-
-#include <cstdarg>
-#include <cstdio>
-
+#include "util.hpp"
 
 namespace MMSS {
 
-static inline int snprintf_safe(char *buffer, size_t size, const char *format, ...) {
-	std::va_list ap;
-	va_start(ap, format);
-	int ret = std::vsnprintf(buffer, size, format, ap);
-	va_end(ap);
-
-	return ret < 0 ? 0 : ret > size ? size : ret;
-}
-
-static inline const char* get_log_prefix(int log_level) {
-	switch(log_level) {
-	case LOG_CRIT:
-		return "Fatal: ";
-	case LOG_ERR:
-		return "Error: ";
-	case LOG_WARNING:
-		return "Warning: ";
-	case LOG_NOTICE:
-		return "Info: ";
-	case LOG_INFO:
-		return "Verbose: ";
-	case LOG_DEBUG:
-		return "DEBUG: ";
-	default:
-		return "";
-	}
-}
-
 void logf(context_t *mmss, int priority, const char *format, ...) {
 	char buf[1024];
 	size_t pos = 0;
@@ -75,17 +44,3 @@ void logf(context_t *mmss, int priority, const char *format, ...) {
 }
 
 }
-
-void gmrf_logf(gmrf_t *gmrf, int priority, const char *format, ...) {
-	char buf[1024];
-	size_t pos = 0;
-
-	pos += MMSS::snprintf_safe(buf, sizeof(buf), "%s: %s", gmrf->name, MMSS::get_log_prefix(priority));
-
-	va_list ap;
-	va_start(ap, format);
-	vsnprintf(buf+pos, sizeof(buf)-pos, format, ap);
-	va_end(ap);
-
-	MMSS::logf(gmrf->mmss, priority, "%s", buf);
-}
diff --git a/mmss/mmss.cpp b/mmss/mmss.cpp
index cb50329..1d918e4 100644
--- a/mmss/mmss.cpp
+++ b/mmss/mmss.cpp
@@ -30,25 +30,11 @@
 #include <cstdio>
 
 
-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 = reinterpret_cast<uint8_t*>(buffer);
-
-	size_t i;
-	for (i = 0; i < len; i++)
-		data[i] = rand_r(&gmrf->rand_seed);
-}
-
 namespace MMSS {
 
-static void init_nodes(gmrf_t *nodes) {
-	gmrf_t *node;
-	for (node = nodes; node; node = node->next) {
-		node->ctx = node->proto->init(node);
-	}
+static void init_nodes(std::list<std::shared_ptr<node_t>> &nodes) {
+	for (auto node : nodes)
+		node->ctx = node->proto->init(node.get());
 }
 
 
@@ -85,22 +71,29 @@ void main(int argc, char *argv[]) {
 
 	read_config(&mmss, &conf, "babel_test.mmss");
 
-	network_t net0 = { .mtu = 1500 }, net1 = { .mtu = 1500 };
-	gmrf_t node1 = { .name = strdup("node1"), .mmss = &mmss, .rand_seed = 1, .proto = proto };
-	gmrf_t node2 = { .name = strdup("node2"), .mmss = &mmss, .rand_seed = 2, .proto = proto };
-	gmrf_t node3 = { .name = strdup("node3"), .mmss = &mmss, .rand_seed = 3, .proto = proto };
+	std::shared_ptr<network_t> net0 = std::make_shared<network_t>();
+	std::shared_ptr<network_t> net1 = std::make_shared<network_t>();
+
+	*net0 = (network_t){ .mtu = 1500 };
+	*net1 = (network_t){ .mtu = 1500 };
+
+	std::shared_ptr<node_t> node1 = node_t::create(&mmss, "node1", 1, proto);
+	std::shared_ptr<node_t> node2 = node_t::create(&mmss, "node2", 2, proto);
+	std::shared_ptr<node_t> node3 = node_t::create(&mmss, "node3", 3, proto);
+
+	std::list<std::shared_ptr<node_t>> nodes;
 
-	node2.next = &node1;
-	node3.next = &node2;
-	gmrf_t *nodes = &node3;
+	nodes.push_back(node1);
+	nodes.push_back(node2);
+	nodes.push_back(node3);
 
 	init_nodes(nodes);
 
 	gmrf_addr_t addr1 = {{1}}, addr2 = {{2}}, addr3 = {{3}}, addr4 = {{4}};
-	add_iface(&node1, &net0, "mmss0", &addr1);
-	add_iface(&node2, &net0, "mmss0", &addr2);
-	add_iface(&node2, &net1, "mmss1", &addr3);
-	add_iface(&node3, &net1, "mmss1", &addr4);
+	add_iface(node1, net0, "mmss0", &addr1);
+	add_iface(node2, net0, "mmss0", &addr2);
+	add_iface(node2, net1, "mmss1", &addr3);
+	add_iface(node3, net1, "mmss1", &addr4);
 
 	while (true) {
 		int timeout = get_queue_timeout(&mmss);
diff --git a/mmss/mmss.hpp b/mmss/mmss.hpp
index 78c93be..4045c40 100644
--- a/mmss/mmss.hpp
+++ b/mmss/mmss.hpp
@@ -29,9 +29,67 @@
 
 #include "queue.hpp"
 
+#include <list>
 #include <memory>
 
 
+struct gmrf {
+private:
+	gmrf(MMSS::context_t *mmss0, const std::string &name0, unsigned rand_seed0, const MMSS::protocol_t *proto0) :
+		mmss(mmss0), name(name0), rand_seed(rand_seed0), proto(proto0) {}
+	gmrf(gmrf const&) = delete;
+	gmrf& operator=(gmrf const&) = delete;
+
+public:
+	static std::shared_ptr<MMSS::node_t> create(MMSS::context_t *mmss, const std::string &name, unsigned rand_seed, const MMSS::protocol_t *proto) {
+		MMSS::node_t *node = new MMSS::node_t(mmss, name, rand_seed, proto);
+
+		std::shared_ptr<MMSS::node_t> ptr(node);
+		node->node = ptr;
+
+		return ptr;
+	}
+
+	std::weak_ptr<MMSS::node_t> node;
+
+	MMSS::context_t *mmss;
+
+	std::string name;
+
+	gmrf_context_t *ctx;
+	std::list<std::shared_ptr<MMSS::iface_t>> interfaces;
+
+	unsigned rand_seed;
+
+	const MMSS::protocol_t *proto;
+};
+
+struct gmrf_iface {
+private:
+	gmrf_iface() {}
+	gmrf_iface(gmrf_iface const&) = delete;
+	gmrf_iface& operator=(gmrf_iface const&) = delete;
+
+public:
+	static std::shared_ptr<MMSS::iface_t> create() {
+		MMSS::iface_t *iface = new MMSS::iface_t;
+
+		std::shared_ptr<MMSS::iface_t> ptr(iface);
+		iface->iface = ptr;
+
+		return ptr;
+	}
+
+	std::weak_ptr<MMSS::iface_t> iface;
+
+	std::string name;
+	gmrf_addr_t address;
+
+	std::weak_ptr<MMSS::node_t> node;
+	std::weak_ptr<MMSS::network_t> net;
+};
+
+
 namespace MMSS {
 
 class context_t {
@@ -45,17 +103,15 @@ public:
 
 class config_t {
 public:
-	network_t *networks;
-	gmrf_t *nodes;
+	std::list<std::shared_ptr<network_t>> network;
+	std::list<std::shared_ptr<node_t>> nodes;
 };
 
 class network_t {
 public:
-	network_t *next;
+	std::string name;
 
-	char *name;
-
-	gmrf_iface_t *interfaces;
+	std::list<std::shared_ptr<iface_t>> interfaces;
 	size_t mtu;
 };
 
@@ -63,8 +119,8 @@ class packet_t {
 public:
 	uint64_t sent;
 
-	gmrf_iface_t *source;
-	gmrf_iface_t *dest;
+	std::weak_ptr<iface_t> source;
+	std::weak_ptr<iface_t> dest;
 
 	size_t len;
 	std::unique_ptr<uint8_t> data;
@@ -72,7 +128,7 @@ public:
 
 class scheduled_t {
 public:
-	gmrf_t *node;
+	std::shared_ptr<node_t> node;
 	gmrf_scheduled_func f;
 	void *arg;
 };
@@ -80,20 +136,15 @@ public:
 
 const protocol_t* load_protocol(const char *module);
 
-namespace Config {
-
-void add_network(context_t *mmss, config_t *conf, const char *name);
-
-}
-
 bool read_config(context_t *mmss, config_t *conf, const char *filename);
 
-void add_iface(gmrf_t *node, network_t *net, const char *name, const gmrf_addr_t *address);
+void add_iface(std::shared_ptr<node_t> node, std::shared_ptr<network_t> net, const std::string &name, const gmrf_addr_t *address);
 
 uint64_t now(const context_t *mmss);
 
 void dispatch(std::shared_ptr<packet_t> packet);
 void run_scheduled(std::shared_ptr<scheduled_t> scheduled);
+void enqueue(context_t *mmss, std::shared_ptr<iface_t> source, std::shared_ptr<iface_t> dest, const void *data, size_t len);
 
 void logf(context_t *mmss, int priority, const char *format, ...);
 
@@ -111,31 +162,14 @@ static inline size_t alignto(size_t l, size_t a) {
 	return ((l+a-1)/a)*a;
 }
 
-}
-
-struct gmrf {
-	gmrf_t *next;
-
-	char *name;
 
-	MMSS::context_t *mmss;
-	gmrf_context_t *ctx;
-	gmrf_iface_t *interfaces;
-
-	unsigned rand_seed;
+namespace Config {
 
-	const MMSS::protocol_t *proto;
-};
+void add_network(context_t *mmss, config_t *conf, const char *name);
 
-struct gmrf_iface {
-	gmrf_iface_t *node_next;
-	gmrf_iface_t *network_next;
+}
 
-	char *name;
-	gmrf_addr_t address;
+}
 
-	gmrf_t *node;
-	MMSS::network_t *net;
-};
 
 #endif /* _GMRF_MMSS_MMSS_HPP_ */
diff --git a/mmss/protocol.cpp b/mmss/protocol.cpp
index f08d13e..3bbfeb1 100644
--- a/mmss/protocol.cpp
+++ b/mmss/protocol.cpp
@@ -33,21 +33,21 @@
 namespace MMSS {
 
 const protocol_t* load_protocol(const char *module) {
-	void *handle = dlopen(module, RTLD_NOW);
+	void *handle = ::dlopen(module, RTLD_NOW);
 	if (!handle) {
-		fprintf(stderr, "unable to load protocol from `%s': %s\n", module, dlerror());
+		std::fprintf(stderr, "unable to load protocol from `%s': %s\n", module, dlerror());
 		return NULL;
 	}
 
-	dlerror();
-	const protocol_t *proto = reinterpret_cast<const protocol_t*>(dlsym(handle, "mmss_protocol_info"));
+	::dlerror();
+	const protocol_t *proto = reinterpret_cast<const protocol_t*>(::dlsym(handle, "mmss_protocol_info"));
 	if (!proto) {
-		fprintf(stderr, "unable to load protocol from `%s': %s\n", module, dlerror());
-		dlclose(handle);
+		std::fprintf(stderr, "unable to load protocol from `%s': %s\n", module, dlerror());
+		::dlclose(handle);
 		return NULL;
 	}
 
-	fprintf(stderr, "loaded protocol `%s' version %s\n", proto->get_name(), proto->get_version());
+	std::fprintf(stderr, "loaded protocol `%s' version %s\n", proto->get_name(), proto->get_version());
 
 	return proto;
 }
diff --git a/mmss/schedule.cpp b/mmss/schedule.cpp
index 88de519..7e6247e 100644
--- a/mmss/schedule.cpp
+++ b/mmss/schedule.cpp
@@ -30,17 +30,7 @@
 namespace MMSS {
 
 void run_scheduled(std::shared_ptr<scheduled_t> scheduled) {
-	scheduled->f(scheduled->node, scheduled->node->ctx, scheduled->arg);
+	scheduled->f(scheduled->node.get(), scheduled->node->ctx, scheduled->arg);
 }
 
 }
-
-void gmrf_schedule(gmrf_t *gmrf, gmrf_scheduled_func f, void *arg, unsigned delay) {
-	std::shared_ptr<MMSS::scheduled_t> scheduled = std::make_shared<MMSS::scheduled_t>();
-
-	scheduled->node = gmrf;
-	scheduled->f = f;
-	scheduled->arg = arg;
-
-	gmrf->mmss->scheduled_queue.put(scheduled, gmrf->mmss->now+delay);
-}
diff --git a/mmss/types.hpp b/mmss/types.hpp
index e8a63cc..3daa486 100644
--- a/mmss/types.hpp
+++ b/mmss/types.hpp
@@ -33,8 +33,8 @@
 
 extern "C" {
 
-#include <gmrf/gmrf.h>
 #include <mmss/protocol.h>
+#include <gmrf/gmrf.h>
 
 }
 
@@ -48,6 +48,9 @@ class scheduled_t;
 
 typedef ::mmss_protocol_t protocol_t;
 
+typedef ::gmrf_t node_t;
+typedef ::gmrf_iface_t iface_t;
+
 }
 
 #endif /* _GMRF_MMSS_TYPES_HPP_ */
diff --git a/mmss/util.hpp b/mmss/util.hpp
new file mode 100644
index 0000000..147a9aa
--- /dev/null
+++ b/mmss/util.hpp
@@ -0,0 +1,47 @@
+/*
+  Copyright (c) 2013, Matthias Schiffer <mschiffer@universe-factory.net>
+  All rights reserved.
+
+  Redistribution and use in source and binary forms, with or without
+  modification, are permitted provided that the following conditions are met:
+
+    1. Redistributions of source code must retain the above copyright notice,
+       this list of conditions and the following disclaimer.
+    2. Redistributions in binary form must reproduce the above copyright notice,
+       this list of conditions and the following disclaimer in the documentation
+       and/or other materials provided with the distribution.
+
+  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+  DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+  DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+  SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+  CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+  OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+  OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+
+#ifndef _GMRF_MMSS_UTIL_HPP_
+#define _GMRF_MMSS_UTIL_HPP_
+
+#include <cstdarg>
+#include <cstdio>
+
+
+namespace MMSS {
+
+static inline int snprintf_safe(char *buffer, size_t size, const char *format, ...) {
+	std::va_list ap;
+	va_start(ap, format);
+	int ret = std::vsnprintf(buffer, size, format, ap);
+	va_end(ap);
+
+	return ret < 0 ? 0 : ret > size ? size : ret;
+}
+
+}
+
+#endif /* _GMRF_MMSS_UTIL_HPP_ */