From 96e9babe10af96c6561da220c224b1e94cbfd508 Mon Sep 17 00:00:00 2001
From: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Date: Wed, 14 Apr 2010 06:55:19 +0200
Subject: win32: add gettimeofday()

---
 win32/mingw.c | 40 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 40 insertions(+)

diff --git a/win32/mingw.c b/win32/mingw.c
index 3611872ec..020e9c420 100644
--- a/win32/mingw.c
+++ b/win32/mingw.c
@@ -15,3 +15,43 @@ int mkstemp(char *template)
 		return -1;
 	return open(filename, O_RDWR | O_CREAT, 0600);
 }
+
+/*
+ * This is like mktime, but without normalization of tm_wday and tm_yday.
+ */
+static time_t tm_to_time_t(const struct tm *tm)
+{
+	static const int mdays[] = {
+	    0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334
+	};
+	int year = tm->tm_year - 70;
+	int month = tm->tm_mon;
+	int day = tm->tm_mday;
+
+	if (year < 0 || year > 129) /* algo only works for 1970-2099 */
+		return -1;
+	if (month < 0 || month > 11) /* array bounds */
+		return -1;
+	if (month < 2 || (year + 2) % 4)
+		day--;
+	return (year * 365 + (year + 1) / 4 + mdays[month] + day) * 24*60*60UL +
+		tm->tm_hour * 60*60 + tm->tm_min * 60 + tm->tm_sec;
+}
+
+int gettimeofday(struct timeval *tv, void *tz)
+{
+	SYSTEMTIME st;
+	struct tm tm;
+	GetSystemTime(&st);
+	tm.tm_year = st.wYear-1900;
+	tm.tm_mon = st.wMonth-1;
+	tm.tm_mday = st.wDay;
+	tm.tm_hour = st.wHour;
+	tm.tm_min = st.wMinute;
+	tm.tm_sec = st.wSecond;
+	tv->tv_sec = tm_to_time_t(&tm);
+	if (tv->tv_sec < 0)
+		return -1;
+	tv->tv_usec = st.wMilliseconds*1000;
+	return 0;
+}
-- 
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