From 8d34de3078469aba636846a15bad08198f66fdc8 Mon Sep 17 00:00:00 2001
From: Nikias Bassen
Date: Mon, 19 Sep 2016 03:10:04 +0200
Subject: Use time64 implementation by Michael G Schwern to extend allowed
 date/time range

The main benefit of this is to allow date/time values outside of the 32bit time_t
range which is very important on 32bit platforms. But there are also some other
issues that will be fixed with this, for example on macOS, mktime() will not work
for dates < 1902 despite time_t being 64bit.

In the same run this commit will also use a reentrant version of gmtime64_r that
should help in multithreaded scenarios.

Original code taken from: https://github.com/evalEmpire/y2038
---
 src/time64_limits.h | 95 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 95 insertions(+)
 create mode 100644 src/time64_limits.h

(limited to 'src/time64_limits.h')

diff --git a/src/time64_limits.h b/src/time64_limits.h
new file mode 100644
index 0000000..91079af
--- /dev/null
+++ b/src/time64_limits.h
@@ -0,0 +1,95 @@
+/*
+   Maximum and minimum inputs your system's respective time functions
+   can correctly handle.  time64.h will use your system functions if
+   the input falls inside these ranges and corresponding USE_SYSTEM_*
+   constant is defined.
+*/
+
+#ifndef TIME64_LIMITS_H
+#define TIME64_LIMITS_H
+
+/* Max/min for localtime() */
+#define SYSTEM_LOCALTIME_MAX     2147483647
+#define SYSTEM_LOCALTIME_MIN    -2147483647-1
+
+/* Max/min for gmtime() */
+#define SYSTEM_GMTIME_MAX        2147483647
+#define SYSTEM_GMTIME_MIN       -2147483647-1
+
+/* Max/min for mktime() */
+static const struct tm SYSTEM_MKTIME_MAX = {
+    7,
+    14,
+    19,
+    18,
+    0,
+    138,
+    1,
+    17,
+    0
+#ifdef HAVE_TM_TM_GMTOFF
+    ,-28800
+#endif
+#ifdef HAVE_TM_TM_ZONE
+    ,(char*)"PST"
+#endif
+};
+
+static const struct tm SYSTEM_MKTIME_MIN = {
+    52,
+    45,
+    12,
+    13,
+    11,
+    1,
+    5,
+    346,
+    0
+#ifdef HAVE_TM_TM_GMTOFF
+    ,-28800
+#endif
+#ifdef HAVE_TM_TM_ZONE
+    ,(char*)"PST"
+#endif
+};
+
+/* Max/min for timegm() */
+#ifdef HAVE_TIMEGM
+static const struct tm SYSTEM_TIMEGM_MAX = {
+    7,
+    14,
+    3,
+    19,
+    0,
+    138,
+    2,
+    18,
+    0
+    #ifdef HAVE_TM_TM_GMTOFF
+        ,0
+    #endif
+    #ifdef HAVE_TM_TM_ZONE
+        ,(char*)"UTC"
+    #endif
+};
+
+static const struct tm SYSTEM_TIMEGM_MIN = {
+    52,
+    45,
+    20,
+    13,
+    11,
+    1,
+    5,
+    346,
+    0
+    #ifdef HAVE_TM_TM_GMTOFF
+        ,0
+    #endif
+    #ifdef HAVE_TM_TM_ZONE
+        ,(char*)"UTC"
+    #endif
+};
+#endif /* HAVE_TIMEGM */
+
+#endif /* TIME64_LIMITS_H */
-- 
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