avrdude: Compilation on Windows/MSVC

xs/src/avrdude/windows/unistd.cpp

@@ -0,0 +1,44 @@
+#include "unistd.h"
+
+#include <cstdint>
+#include <chrono>
+#include <thread>
+
+#include <windows.h>
+
+
+extern "C" {
+
+
+int usleep(unsigned usec)
+{
+	std::this_thread::sleep_for(std::chrono::microseconds(usec));
+	return 0;
+}
+
+
+// SO: https://stackoverflow.com/questions/10905892/equivalent-of-gettimeday-for-windows
+int gettimeofday(struct timeval *tp, struct timezone *tzp)
+{
+    // Note: some broken versions only have 8 trailing zero's, the correct epoch has 9 trailing zero's
+    // This magic number is the number of 100 nanosecond intervals since January 1, 1601 (UTC)
+    // until 00:00:00 January 1, 1970 
+    static const std::uint64_t EPOCH = ((std::uint64_t) 116444736000000000ULL);
+
+    SYSTEMTIME  system_time;
+    FILETIME    file_time;
+    std::uint64_t    time;
+
+    GetSystemTime(&system_time);
+    SystemTimeToFileTime(&system_time, &file_time);
+    time = ((std::uint64_t)file_time.dwLowDateTime);
+    time += ((std::uint64_t)file_time.dwHighDateTime) << 32;
+
+    tp->tv_sec  = (long)((time - EPOCH) / 10000000L);
+    tp->tv_usec = (long)(system_time.wMilliseconds * 1000);
+    return 0;
+}
+
+
+
+}