early-access version 2853

externals/vcpkg/ports/gettimeofday/gettimeofday.c

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+/*
+ * Copied from PostgreSQL source:
+ *  http://doxygen.postgresql.org/gettimeofday_8c_source.html
+ *
+ */
+
+/*
+ * gettimeofday.c
+ *	  Win32 gettimeofday() replacement
+ *
+ * src/port/gettimeofday.c
+ *
+ * Copyright (c) 2003 SRA, Inc.
+ * Copyright (c) 2003 SKC, Inc.
+ *
+ * Permission to use, copy, modify, and distribute this software and
+ * its documentation for any purpose, without fee, and without a
+ * written agreement is hereby granted, provided that the above
+ * copyright notice and this paragraph and the following two
+ * paragraphs appear in all copies.
+ *
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE TO ANY PARTY FOR DIRECT,
+ * INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, INCLUDING
+ * LOST PROFITS, ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS
+ * DOCUMENTATION, EVEN IF THE UNIVERSITY OF CALIFORNIA HAS BEEN ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * THE AUTHOR SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS ON AN "AS
+ * IS" BASIS, AND THE AUTHOR HAS NO OBLIGATIONS TO PROVIDE MAINTENANCE,
+ * SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
+ */
+
+#ifdef _MSC_VER
+
+#include <winsock2.h>
+
+
+/* FILETIME of Jan 1 1970 00:00:00. */
+static const unsigned __int64 epoch = 116444736000000000Ui64;
+
+/*
+ * timezone information is stored outside the kernel so tzp isn't used anymore.
+ *
+ * Note: this function is not for Win32 high precision timing purpose. See
+ * elapsed_time().
+ */
+int
+gettimeofday(struct timeval * tp, struct timezone * tzp)
+{
+	FILETIME	file_time;
+	SYSTEMTIME	system_time;
+	ULARGE_INTEGER ularge;
+
+	GetSystemTime(&system_time);
+	SystemTimeToFileTime(&system_time, &file_time);
+	ularge.LowPart = file_time.dwLowDateTime;
+	ularge.HighPart = file_time.dwHighDateTime;
+
+	tp->tv_sec = (long) ((ularge.QuadPart - epoch) / 10000000L);
+	tp->tv_usec = (long) (system_time.wMilliseconds * 1000);
+
+	return 0;
+}
+
+#endif /* _MSC_VER */