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d29871977f
We already have a LICENSE file that covers the Zig Standard Library. We no longer need to remind everyone that the license is MIT in every single file. Previously this was introduced to clarify the situation for a fork of Zig that made Zig's LICENSE file harder to find, and replaced it with their own license that required annual payments to their company. However that fork now appears to be dead. So there is no need to reinforce the copyright notice in every single file.
41 lines
1.6 KiB
Zig
41 lines
1.6 KiB
Zig
const std = @import("std");
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pub const WindowsVersion = std.Target.Os.WindowsVersion;
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/// Returns the highest known WindowsVersion deduced from reported runtime information.
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/// Discards information about in-between versions we don't differentiate.
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pub fn detectRuntimeVersion() WindowsVersion {
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var version_info: std.os.windows.RTL_OSVERSIONINFOW = undefined;
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version_info.dwOSVersionInfoSize = @sizeOf(@TypeOf(version_info));
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switch (std.os.windows.ntdll.RtlGetVersion(&version_info)) {
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.SUCCESS => {},
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else => unreachable,
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}
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// Starting from the system infos build a NTDDI-like version
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// constant whose format is:
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// B0 B1 B2 B3
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// `---` `` ``--> Sub-version (Starting from Windows 10 onwards)
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// \ `--> Service pack (Always zero in the constants defined)
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// `--> OS version (Major & minor)
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const os_ver: u16 = @intCast(u16, version_info.dwMajorVersion & 0xff) << 8 |
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@intCast(u16, version_info.dwMinorVersion & 0xff);
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const sp_ver: u8 = 0;
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const sub_ver: u8 = if (os_ver >= 0x0A00) subver: {
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// There's no other way to obtain this info beside
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// checking the build number against a known set of
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// values
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var last_idx: usize = 0;
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for (WindowsVersion.known_win10_build_numbers) |build, i| {
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if (version_info.dwBuildNumber >= build)
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last_idx = i;
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}
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break :subver @truncate(u8, last_idx);
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} else 0;
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const version: u32 = @as(u32, os_ver) << 16 | @as(u16, sp_ver) << 8 | sub_ver;
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return @intToEnum(WindowsVersion, version);
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}
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