From dc76fb147b35fe0db8ef6ccca12f6bab3eeec15a Mon Sep 17 00:00:00 2001
From: Evan Miller <emmiller@gmail.com>
Date: Mon, 21 Dec 2020 20:08:57 -0500
Subject: [PATCH] Attempt to fix large file support on Windows

---
 src/readstat.h           | 2 +-
 src/readstat_io_unistd.c | 6 +++---
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/src/readstat.h b/src/readstat.h
index ece0d379..c9aa8250 100644
--- a/src/readstat.h
+++ b/src/readstat.h
@@ -298,7 +298,7 @@ typedef int (*readstat_progress_handler)(double progress, void *ctx);
 #if defined(_MSC_VER)
 #include <BaseTsd.h>
 typedef SSIZE_T ssize_t;
-typedef _off_t readstat_off_t;
+typedef __int64 readstat_off_t;
 #elif defined _WIN32 || defined __CYGWIN__
 typedef _off64_t readstat_off_t;
 #elif defined _AIX
diff --git a/src/readstat_io_unistd.c b/src/readstat_io_unistd.c
index 35602911..d3adbf92 100644
--- a/src/readstat_io_unistd.c
+++ b/src/readstat_io_unistd.c
@@ -7,6 +7,7 @@
 #endif
 #if defined _WIN32
 #   include <windows.h>
+#   include <io.h>
 #endif
 
 #include "readstat.h"
@@ -20,10 +21,9 @@
 #define UNISTD_OPEN_OPTIONS O_RDONLY
 #endif
 
-#if defined _MSC_VER && defined WIN64
+#if defined _WIN32
 #define lseek _lseeki64
-#elif defined _MSC_VER
-#elif defined _WIN32 || defined _AIX
+#elif defined _AIX
 #define lseek lseek64
 #endif