From d326f16dd40013e8bea639ff95c2b249e7867e5e Mon Sep 17 00:00:00 2001
From: Karen Arutyunov <karen@codesynthesis.com>
Date: Thu, 9 Jun 2016 16:30:17 +0300
Subject: Eliminate the use of *_s() functions on Windows

---
 butl/timestamp.cxx       | 23 +++++++++++++++++++++--
 tests/process/driver.cxx |  4 ++--
 2 files changed, 23 insertions(+), 4 deletions(-)

diff --git a/butl/timestamp.cxx b/butl/timestamp.cxx
index bf02829..4c226fe 100644
--- a/butl/timestamp.cxx
+++ b/butl/timestamp.cxx
@@ -71,13 +71,27 @@ using namespace details;
 // original function is absent. However, MinGW GCC can sometimes provide them.
 // And so to avoid name clashes we hide them in the details namespace.
 //
+// Previously we have used gmtime_s() and localtime_s() for gmtime() and
+// localtime() implementations for Windows, but that required Security-Enhanced
+// version of CRT to be present, which is not always the case. In particular if
+// MinGW is configured with --disable-secure-api option then declarations of
+// *_s() functions are not available. So we use ::gmtime() and ::localtime()
+// for that purpose. Note that according to MSDN "gmtime and localtime all use
+// one common tm structure per thread for the conversion", which mean that they
+// are thread-safe.
+//
 namespace details
 {
   static tm*
   gmtime (const time_t* t, tm* r)
   {
 #ifdef _WIN32
-    return gmtime_s (r, t) != 0 ? nullptr : r;
+    const tm* gt (::gmtime (t));
+    if (gt == nullptr)
+      return nullptr;
+
+    *r = *gt;
+    return r;
 #else
     return gmtime_r (t, r);
 #endif
@@ -87,7 +101,12 @@ namespace details
   localtime (const time_t* t, tm* r)
   {
 #ifdef _WIN32
-    return localtime_s (r, t) != 0 ? nullptr : r;
+    const tm* lt (::localtime (t));
+    if (lt == nullptr)
+      return nullptr;
+
+    *r = *lt;
+    return r;
 #else
     return localtime_r (t, r);
 #endif
diff --git a/tests/process/driver.cxx b/tests/process/driver.cxx
index efb4ca3..741340c 100644
--- a/tests/process/driver.cxx
+++ b/tests/process/driver.cxx
@@ -2,7 +2,7 @@
 // copyright : Copyright (c) 2014-2016 Code Synthesis Ltd
 // license   : MIT; see accompanying LICENSE file
 
-#include <stdlib.h> // getenv(), setenv(), _putenv_s()
+#include <stdlib.h> // getenv(), setenv(), _putenv()
 
 #include <ios>
 #include <string>
@@ -306,7 +306,7 @@ try
 #ifndef _WIN32
   assert (setenv ("PATH", paths.c_str (), 1) == 0);
 #else
-  assert (_putenv_s ("PATH", paths.c_str ()) == 0);
+  assert (_putenv (("PATH=" + paths).c_str ()) == 0);
 #endif
 
   dir_path::current (fp.directory () / dir_path (".."));
-- 
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