From ee95df36af1645f5eab9b94b86d4e77e06f7d247 Mon Sep 17 00:00:00 2001
From: Trygve Laugstøl <trygvis@inamo.no>
Date: Thu, 6 Sep 2018 18:48:36 +0200
Subject: o Actually formatting UUIDs as UUIDs.

---
 ble/misc.cpp | 27 ++++++++-------------------
 1 file changed, 8 insertions(+), 19 deletions(-)

diff --git a/ble/misc.cpp b/ble/misc.cpp
index afd89cb..b26b99e 100644
--- a/ble/misc.cpp
+++ b/ble/misc.cpp
@@ -1,10 +1,7 @@
 #include "ble/misc.h"
 
-#include <ios>
-#include <ostream>
-#include <iomanip>
 #include <ble/misc.h>
-
+#include <string>
 
 namespace trygvis {
 namespace bluetooth {
@@ -15,21 +12,13 @@ std::ostream &operator<<(std::ostream &s, Uuid const &uuid) {
 }
 
 std::string Uuid::str() const {
-    auto v = value;
-
-    std::stringstream s;
-    s << std::hex << std::setw(2) <<
-      int(v[0]) << int(v[1]) << ":" <<
-      int(v[2]) << int(v[3]) << ":" <<
-      int(v[4]) << int(v[5]) << ":" <<
-      int(v[6]) << int(v[7]) << ":" <<
-      int(v[8]) << int(v[9]) << ":" <<
-      int(v[10]) << int(v[11]) << ":" <<
-      int(v[12]) << int(v[13]) << ":" <<
-      int(v[14]) << int(v[15]) << ":" <<
-      std::resetiosflags(std::ios_base::basefield);
-
-    return s.str();
+    char str[37];
+
+    std::sprintf(str, "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x",
+                 value[0], value[1], value[2], value[3], value[4], value[5], value[6], value[7],
+                 value[8], value[9], value[10], value[11], value[12], value[13], value[14], value[15]);
+
+    return {str};
 }
 
 Uuid makeUuid(const Uuid &base, uint8_t a, uint8_t b) {
-- 
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