From c2474f2b2b581ddfd207095b4ee433757e2abfbf Mon Sep 17 00:00:00 2001
From: Vincent Richard <vincent@vincent-richard.net>
Date: Tue, 5 Feb 2013 14:21:21 +0100
Subject: [PATCH] Check for localtime_r and gmtime_r at build instead of
 testing _REENTRANT. Use localtime_s and gmtime_s on Windows, if available.

---
 CMakeLists.txt                           | 20 ++++++++++++++------
 SConstruct                               |  4 ++++
 cmake/config.hpp.cmake                   |  4 ++++
 src/dateTime.cpp                         |  5 +++--
 src/platforms/posix/posixHandler.cpp     |  4 ++--
 src/platforms/windows/windowsHandler.cpp | 10 ++++++++--
 6 files changed, 35 insertions(+), 12 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 4f044a2b..0b9e2218 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -16,6 +16,11 @@ CMAKE_MINIMUM_REQUIRED(VERSION 2.6 FATAL_ERROR)
 
 INCLUDE(cmake/Utils.cmake)
 
+INCLUDE(CheckFunctionExists)
+INCLUDE(CheckSymbolExists)
+INCLUDE(CheckTypeSize)
+
+
 # CMake configuration
 SET(CMAKE_RUNTIME_OUTPUT_DIRECTORY build/bin)
 SET(CMAKE_LIBRARY_OUTPUT_DIRECTORY build/lib)
@@ -341,7 +346,6 @@ SET(
 INCLUDE(cmake/TargetArch.cmake)
 TARGET_ARCHITECTURE(CMAKE_TARGET_ARCHITECTURES)
 
-INCLUDE(CheckTypeSize)
 CHECK_TYPE_SIZE(size_t VMIME_HAVE_SIZE_T)
 
 
@@ -453,8 +457,6 @@ ENDIF()
 INCLUDE(FindGnuTLS)
 INCLUDE(FindOpenSSL)
 
-
-INCLUDE(CheckFunctionExists)
 SET(CMAKE_REQUIRED_LIBRARIES "${GNUTLS_LIBRARY}")
 CHECK_FUNCTION_EXISTS(gnutls_priority_set_direct VMIME_HAVE_GNUTLS_PRIORITY_FUNCS)
 
@@ -558,10 +560,16 @@ ENDIF()
 
 
 ##############################################################################
-# POSIX-specific checks
+# Platform-specific checks
 
-INCLUDE(CheckFunctionExists)
-INCLUDE(CheckSymbolExists)
+CHECK_FUNCTION_EXISTS(gmtime_s VMIME_HAVE_GMTIME_S)
+CHECK_FUNCTION_EXISTS(gmtime_r VMIME_HAVE_GMTIME_R)
+CHECK_FUNCTION_EXISTS(localtime_s VMIME_HAVE_LOCALTIME_S)
+CHECK_FUNCTION_EXISTS(localtime_r VMIME_HAVE_LOCALTIME_R)
+
+
+##############################################################################
+# POSIX-specific checks
 
 CHECK_FUNCTION_EXISTS(getaddrinfo VMIME_HAVE_GETADDRINFO)
 CHECK_FUNCTION_EXISTS(getnameinfo VMIME_HAVE_GETNAMEINFO)
diff --git a/SConstruct b/SConstruct
index 421d715f..cb974330 100644
--- a/SConstruct
+++ b/SConstruct
@@ -867,6 +867,10 @@ config_hpp.write("""
 #define VMIME_HAVE_GETTID 0
 #define VMIME_HAVE_SYSCALL 1
 #define VMIME_HAVE_SYSCALL_GETTID 1
+#define VMIME_HAVE_LOCALTIME_R 1
+#define VMIME_HAVE_LOCALTIME_S 0
+#define VMIME_HAVE_GMTIME_R 1
+#define VMIME_HAVE_GMTIME_S 0
 """)
 
 config_hpp.write('\n')
diff --git a/cmake/config.hpp.cmake b/cmake/config.hpp.cmake
index 8e7f727d..3d9aba92 100644
--- a/cmake/config.hpp.cmake
+++ b/cmake/config.hpp.cmake
@@ -63,6 +63,10 @@ typedef unsigned @VMIME_32BIT_TYPE@ vmime_uint32;
 #cmakedefine01 VMIME_HAVE_GETTID
 #cmakedefine01 VMIME_HAVE_SYSCALL
 #cmakedefine01 VMIME_HAVE_SYSCALL_GETTID
+#cmakedefine01 VMIME_HAVE_GMTIME_S
+#cmakedefine01 VMIME_HAVE_GMTIME_R
+#cmakedefine01 VMIME_HAVE_LOCALTIME_S
+#cmakedefine01 VMIME_HAVE_LOCALTIME_R
 
 
 #define VMIME_SENDMAIL_PATH "@VMIME_SENDMAIL_PATH@"
diff --git a/src/dateTime.cpp b/src/dateTime.cpp
index feb18718..f98d7c64 100644
--- a/src/dateTime.cpp
+++ b/src/dateTime.cpp
@@ -23,6 +23,7 @@
 
 #include <iomanip>
 
+#include "vmime/config.hpp"
 #include "vmime/dateTime.hpp"
 #include "vmime/platform.hpp"
 #include "vmime/parserHelpers.hpp"
@@ -663,7 +664,7 @@ datetime::datetime(const time_t t, const int zone)
 		tms = *gtm;
 	else if (ltm)
 		tms = *ltm;
-#elif defined(_REENTRANT)
+#elif VMIME_HAVE_LOCALTIME_R
 	struct tm tms;
 
 	if (!gmtime_r(&t, &tms))
@@ -678,7 +679,7 @@ datetime::datetime(const time_t t, const int zone)
 		tms = *gtm;
 	else if (ltm)
 		tms = *ltm;
-#endif // _REENTRANT
+#endif
 
 	m_year = tms.tm_year + 1900;
 	m_month = tms.tm_mon + 1;
diff --git a/src/platforms/posix/posixHandler.cpp b/src/platforms/posix/posixHandler.cpp
index d90b316c..6536b5ef 100644
--- a/src/platforms/posix/posixHandler.cpp
+++ b/src/platforms/posix/posixHandler.cpp
@@ -132,7 +132,7 @@ const vmime::datetime posixHandler::getCurrentLocalTime() const
 	const time_t t(::time(NULL));
 
 	// Get the local time
-#ifdef _REENTRANT
+#if VMIME_HAVE_LOCALTIME_R
 	tm local;
 	::localtime_r(&t, &local);
 #else
@@ -140,7 +140,7 @@ const vmime::datetime posixHandler::getCurrentLocalTime() const
 #endif
 
 	// Get the UTC time
-#ifdef _REENTRANT
+#if VMIME_HAVE_GMTIME_R
 	tm gmt;
 	::gmtime_r(&t, &gmt);
 #else
diff --git a/src/platforms/windows/windowsHandler.cpp b/src/platforms/windows/windowsHandler.cpp
index b1ab87fa..6583cab1 100644
--- a/src/platforms/windows/windowsHandler.cpp
+++ b/src/platforms/windows/windowsHandler.cpp
@@ -79,7 +79,10 @@ const vmime::datetime windowsHandler::getCurrentLocalTime() const
 	const time_t t(::time(NULL));
 
 	// Get the local time
-#if defined(_REENTRANT) && defined(localtime_r)
+#if VMIME_HAVE_LOCALTIME_S
+	tm local;
+	::localtime_s(&local, &t);
+#elif VMIME_HAVE_LOCALTIME_R
 	tm local;
 	::localtime_r(&t, &local);
 #else
@@ -87,7 +90,10 @@ const vmime::datetime windowsHandler::getCurrentLocalTime() const
 #endif
 
 	// Get the UTC time
-#if defined(_REENTRANT) && defined(gmtime_r)
+#if VMIME_HAVE_GMTIME_S
+	tm gmt;
+	::gmtime_s(&gmt, &t);
+#elif VMIME_HAVE_GMTIME_R
 	tm gmt;
 	::gmtime_r(&t, &gmt);
 #else