1 files changed, 102 insertions, 0 deletions
diff --git a/src/lib/util/chrono_time_utils.cc b/src/lib/util/chrono_time_utils.cc
new file mode 100644
index 0000000..6c76112
--- /dev/null
+++ b/src/lib/util/chrono_time_utils.cc
@@ -0,0 +1,102 @@
+// Copyright (C) 2015-2020 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <util/chrono_time_utils.h>
+#include <sstream>
+#include <iomanip>
+
+using namespace std::chrono;
+
+namespace isc {
+namespace util {
+
+std::string
+clockToText(std::chrono::system_clock::time_point t, size_t fsecs_precision) {
+    time_t tt = system_clock::to_time_t(t);
+    struct tm tm;
+    localtime_r(&tt, &tm);
+    std::stringstream s;
+    s << (tm.tm_year + 1900)
+      << "-" << std::setw(2) << std::setfill('0') << (tm.tm_mon + 1)
+      << "-" << std::setw(2) << std::setfill('0') << tm.tm_mday
+      << " " << std::setw(2) << std::setfill('0') << tm.tm_hour
+      << ":" << std::setw(2) << std::setfill('0') << tm.tm_min
+      << ":" << std::setw(2) << std::setfill('0') << tm.tm_sec;
+
+    // If the requested precision is less than the maximum native precision
+    // we will divide the fractional seconds value by 10^(max - requested)
+    if (fsecs_precision) {
+        system_clock::duration dur = t - system_clock::from_time_t(tt);
+        microseconds frac = duration_cast<microseconds>(dur);
+        auto fsecs = frac.count();
+        size_t width = MAX_FSECS_PRECISION;
+        if (fsecs_precision < width) {
+            for (auto i = 0; i < width - fsecs_precision; ++i) {
+                fsecs /= 10;
+            }
+
+            width = fsecs_precision;
+        }
+
+        s << "." << std::setw(width)
+          << std::setfill('0')
+          << fsecs;
+    }
+
+    return (s.str());
+}
+
+template<typename Duration> std::string
+durationToText(Duration dur, size_t fsecs_precision) {
+    seconds unfrac = duration_cast<seconds>(dur);
+    auto secs = unfrac.count();
+    std::stringstream s;
+    auto hours = secs / 3600;
+    secs -= hours * 3600;
+    s << std::setw(2) << std::setfill('0') << hours;
+    auto mins = secs / 60;
+    secs -= mins * 60;
+    s << ":" << std::setw(2) << std::setfill('0') << mins
+      << ":" << std::setw(2) << std::setfill('0') << secs;
+
+    // If the requested precision is less than the maximum native precision
+    // we will divide the fractional seconds value by 10^(max - requested)
+    if (fsecs_precision) {
+        microseconds frac = duration_cast<microseconds>(dur);
+        frac -= duration_cast<microseconds>(unfrac);
+        auto fsecs = frac.count();
+        size_t width = MAX_FSECS_PRECISION;
+        if (fsecs_precision < width) {
+            for (auto i = 0; i < width - fsecs_precision; ++i) {
+                fsecs /= 10;
+            }
+
+            width = fsecs_precision;
+        }
+
+        s << "." << std::setw(width)
+          << std::setfill('0')
+          << fsecs;
+    }
+
+    return (s.str());
+}
+
+// Instantiate for standard clocks.
+template std::string
+durationToText<system_clock::duration>(system_clock::duration dur,
+                                       size_t fsecs_precision);
+
+#if !CHRONO_SAME_DURATION
+template std::string
+durationToText<steady_clock::duration>(steady_clock::duration dur,
+                                       size_t fsecs_precision);
+#endif
+
+} // end of isc::util namespace
+} // end of isc namespace