From aa170a7eff3b15119561d33f9263ceea5c2c7bee Mon Sep 17 00:00:00 2001
From: Andrew Kelley <andrew@ziglang.org>
Date: Mon, 15 Jul 2019 00:02:44 -0400
Subject: implement std.fs.File.updateTimes for windows

---
 std/os/windows.zig          | 24 ++++++++++++++++++++++++
 std/os/windows/kernel32.zig |  7 +++++++
 2 files changed, 31 insertions(+)

(limited to 'std/os')

diff --git a/std/os/windows.zig b/std/os/windows.zig
index 60ebf01166..a608839b80 100644
--- a/std/os/windows.zig
+++ b/std/os/windows.zig
@@ -767,11 +767,35 @@ pub fn GetFileInformationByHandle(
     return info;
 }
 
+pub const SetFileTimeError = error{Unexpected};
+
+pub fn SetFileTime(
+    hFile: HANDLE,
+    lpCreationTime: ?*const FILETIME,
+    lpLastAccessTime: ?*const FILETIME,
+    lpLastWriteTime: ?*const FILETIME,
+) SetFileTimeError!void {
+    const rc = kernel32.SetFileTime(hFile, lpCreationTime, lpLastAccessTime, lpLastWriteTime);
+    if (rc == 0) {
+        switch (kernel32.GetLastError()) {
+            else => |err| return unexpectedError(err),
+        }
+    }
+}
+
 pub fn fileTimeToNanoSeconds(ft: FILETIME) u64 {
     const sec = (u64(ft.dwHighDateTime) << 32) | ft.dwLowDateTime;
     return sec * std.time.ns_per_s;
 }
 
+pub fn nanoSecondsToFileTime(ns: u64) FILETIME {
+    const sec = ns / std.time.ns_per_s;
+    return FILETIME{
+        .dwHighDateTime = @truncate(u32, sec >> 32),
+        .dwLowDateTime = @truncate(u32, sec),
+    };
+}
+
 pub fn cStrToPrefixedFileW(s: [*]const u8) ![PATH_MAX_WIDE + 1]u16 {
     return sliceToPrefixedFileW(mem.toSliceConst(u8, s));
 }
diff --git a/std/os/windows/kernel32.zig b/std/os/windows/kernel32.zig
index de5bd57a5a..e4edc349ab 100644
--- a/std/os/windows/kernel32.zig
+++ b/std/os/windows/kernel32.zig
@@ -170,6 +170,13 @@ pub extern "kernel32" stdcallcc fn SetFilePointerEx(
     in_dwMoveMethod: DWORD,
 ) BOOL;
 
+pub extern "kernel32" stdcallcc fn SetFileTime(
+    hFile: HANDLE,
+    lpCreationTime: ?*const FILETIME,
+    lpLastAccessTime: ?*const FILETIME,
+    lpLastWriteTime: ?*const FILETIME,
+) BOOL;
+
 pub extern "kernel32" stdcallcc fn SetHandleInformation(hObject: HANDLE, dwMask: DWORD, dwFlags: DWORD) BOOL;
 
 pub extern "kernel32" stdcallcc fn Sleep(dwMilliseconds: DWORD) void;
-- 
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