From bef4c7a13491d04ab6ffd0ca270eed90efc9d56c Mon Sep 17 00:00:00 2001
From: =?utf8?q?J=C3=A9r=C3=A9mie=20Galarneau?=
 <jeremie.galarneau@efficios.com>
Date: Wed, 12 Dec 2018 15:10:36 -0500
Subject: [PATCH] Add an internal uuid formatting utility
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Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
---
 src/common/compat/Makefile.am |  2 +-
 src/common/compat/uuid.c      | 29 +++++++++++++++++++++++++++++
 src/common/compat/uuid.h      | 11 +++++++++++
 3 files changed, 41 insertions(+), 1 deletion(-)
 create mode 100644 src/common/compat/uuid.c

diff --git a/src/common/compat/Makefile.am b/src/common/compat/Makefile.am
index c5418baeb..82c74eedf 100644
--- a/src/common/compat/Makefile.am
+++ b/src/common/compat/Makefile.am
@@ -7,6 +7,6 @@ COMPAT=compat-poll.c
 endif
 
 libcompat_la_SOURCES = poll.h fcntl.h endian.h mman.h dirent.h \
-		socket.h compat-fcntl.c uuid.h tid.h \
+		socket.h compat-fcntl.c uuid.h uuid.c tid.h \
 		getenv.h string.h prctl.h paths.h netdb.h $(COMPAT) \
 		time.h
diff --git a/src/common/compat/uuid.c b/src/common/compat/uuid.c
new file mode 100644
index 000000000..8759de6f5
--- /dev/null
+++ b/src/common/compat/uuid.c
@@ -0,0 +1,29 @@
+/*
+ * Copyright (C) 2018 - Jérémie Galarneau <jeremie.galarneau@efficios.com>
+ *
+ * This library is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License, version 2.1 only,
+ * as published by the Free Software Foundation.
+ *
+ * This library is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
+ * for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this library; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <stdio.h>
+#include <common/compat/uuid.h>
+
+void lttng_uuid_to_str(const unsigned char *uuid, char *uuid_str)
+{
+	sprintf(uuid_str,
+			"%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x",
+			uuid[0], uuid[1], uuid[2], uuid[3],
+			uuid[4], uuid[5], uuid[6], uuid[7],
+			uuid[8], uuid[9], uuid[10], uuid[11],
+			uuid[12], uuid[13], uuid[14], uuid[15]);
+}
diff --git a/src/common/compat/uuid.h b/src/common/compat/uuid.h
index 4a71f16c8..dcc4ed560 100644
--- a/src/common/compat/uuid.h
+++ b/src/common/compat/uuid.h
@@ -23,6 +23,8 @@
 #ifndef LTTNG_UUID_H
 #define LTTNG_UUID_H
 
+#include <common/macros.h>
+
 /*
  * Includes final \0.
  */
@@ -65,4 +67,13 @@ int lttng_uuid_generate(unsigned char *uuid_out)
 #error "LTTng-Tools needs to have a UUID generator configured."
 #endif
 
+/*
+ * Convert a UUID to a human-readable, NULL-terminated, string of the form
+ * xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx.
+ *
+ * Assumes uuid_str is at least UUID_STR_LEN byte long.
+ */
+LTTNG_HIDDEN
+void lttng_uuid_to_str(const unsigned char *uuid, char *uuid_str);
+
 #endif /* LTTNG_UUID_H */
-- 
2.34.1