Add support for Visual Studio 2019

msvc/unistd.h

@@ -0,0 +1,37 @@
+/*
+ * avrdude - A Downloader/Uploader for AVR device programmers
+ * Copyright (C) 2018 Marius Greuel
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef _UNISTD_H
+#define _UNISTD_H
+
+#define STDIN_FILENO _fileno(stdin)
+#define STDERR_FILENO _fileno(stderr)
+
+#include <getopt.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+    
+int usleep(unsigned int us);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif