From b1620387ba654983f660dedf09a59c602fbabf89 Mon Sep 17 00:00:00 2001
From: dmiller <dmiller@e0a8ed71-7df4-0310-8962-fdc924857419>
Date: Sun, 19 Jan 2020 16:37:37 +0000
Subject: [PATCH] Add thread-safe gmtime equivalent to nbase

---
 nbase/nbase.h      |  1 +
 nbase/nbase_time.c | 29 +++++++++++++++++++++++++++++
 2 files changed, 30 insertions(+)

diff --git a/nbase/nbase.h b/nbase/nbase.h
index 9298e0214..2078448e6 100644
--- a/nbase/nbase.h
+++ b/nbase/nbase.h
@@ -458,6 +458,7 @@ void usleep(unsigned long usec);
 /* localtime is not thread safe. This will use a thread safe alternative on
  * supported platforms. */
 int n_localtime(const time_t *timer, struct tm *result);
+int n_gmtime(const time_t *timer, struct tm *result);
 int n_ctime(char *buffer, size_t bufsz, const time_t *timer);
 
 /***************** String functions -- See nbase_str.c ******************/
diff --git a/nbase/nbase_time.c b/nbase/nbase_time.c
index 90130e04a..57637202e 100644
--- a/nbase/nbase_time.c
+++ b/nbase/nbase_time.c
@@ -165,6 +165,10 @@ int n_localtime(const time_t *timer, struct tm *result) {
   return localtime_s(result, timer);
 }
 
+int n_gmtime(const time_t *timer, struct tm *result) {
+  return gmtime_s(result, timer);
+}
+
 int n_ctime(char *buffer, size_t bufsz, const time_t *timer) {
   return ctime_s(buffer, bufsz, timer);
 }
@@ -184,6 +188,14 @@ int n_localtime(const time_t *timer, struct tm *result) {
   return 0;
 }
 
+int n_gmtime(const time_t *timer, struct tm *result) {
+  struct tm *tmp = gmtime_s(timer, result);
+  if (!tmp) {
+    return errno;
+  }
+  return 0;
+}
+
 int n_ctime(char *buffer, size_t bufsz, const time_t *timer) {
   return ctime_s(buffer, bufsz, timer);
 }
@@ -200,6 +212,14 @@ int n_localtime(const time_t *timer, struct tm *result) {
   return 0;
 }
 
+int n_gmtime(const time_t *timer, struct tm *result) {
+  struct tm *tmp = gmtime_r(timer, result);
+  if (!tmp) {
+    return errno;
+  }
+  return 0;
+}
+
 int n_ctime(char *buffer, size_t bufsz, const time_t *timer) {
   char *tmp = ctime_r(timer, buffer);
   if (!tmp) {
@@ -223,6 +243,15 @@ int n_localtime(const time_t *timer, struct tm *result) {
   return 0;
 }
 
+int n_gmtime(const time_t *timer, struct tm *result) {
+  struct tm *tmp = gmtime(timer); // lgtm[cpp/potentially-dangerous-function]
+  if (tmp)
+    *result = *tmp;
+  else
+    return errno;
+  return 0;
+}
+
 int n_ctime(char *buffer, size_t bufsz, const time_t *timer) {
   char *tmp = ctime(timer); // lgtm[cpp/potentially-dangerous-function]
   if (tmp)