Commit de53537f10e22cc003cfbc77468349b758470f24 | zig

author	LemonBoy <thatlemon@gmail.com> 2020-03-12 22:46:12+01:00
committer	LemonBoy <thatlemon@gmail.com> 2020-03-13 08:45:37+01:00
log	de53537f10e22cc003cfbc77468349b758470f24
tree	8d8685fa2ec6d44ea0b73be7a719da990a7f5663
parent	bd0b51477a6cb0dc7ea7739f61a70110d39ba601

5 files changed, 40 insertions(+), 7 deletions(-)

lib/std/fs/file.zig+1-1

...	...	@@ -102,7 +102,7 @@ pub const File = struct {
102	102	pub const SetEndPosError = os.TruncateError;
103	103
104	104	/// Shrinks or expands the file.
105		/// The file offset after this call is undefined.
	105	/// The file offset after this call is left unchanged.
106	106	pub fn setEndPos(self: File, length: u64) SetEndPosError!void {
107	107	try os.ftruncate(self.handle, length);
108	108	}

lib/std/io/test.zig+8-2

...	...	@@ -1,5 +1,5 @@
1		const builtin = @import("builtin");
2		const std = @import("../std.zig");
	1	const std = @import("std");
	2	const builtin = std.builtin;
3	3	const io = std.io;
4	4	const meta = std.meta;
5	5	const trait = std.trait;
...	...	@@ -133,13 +133,19 @@ test "setEndPos" {
133	133	fs.cwd().deleteFile(tmp_file_name) catch {};
134	134	}
135	135
	136	// Verify that the file size changes and the file offset is not moved
136	137	std.testing.expect((try file.getEndPos()) == 0);
	138	std.testing.expect((try file.getPos()) == 0);
137	139	try file.setEndPos(8192);
138	140	std.testing.expect((try file.getEndPos()) == 8192);
	141	std.testing.expect((try file.getPos()) == 0);
	142	try file.seekTo(100);
139	143	try file.setEndPos(4096);
140	144	std.testing.expect((try file.getEndPos()) == 4096);
	145	std.testing.expect((try file.getPos()) == 100);
141	146	try file.setEndPos(0);
142	147	std.testing.expect((try file.getEndPos()) == 0);
	148	std.testing.expect((try file.getPos()) == 100);
143	149	}
144	150
145	151	test "updateTimes" {

lib/std/os.zig+20-4

...	...	@@ -447,10 +447,25 @@ pub const TruncateError = error{
447	447
448	448	pub fn ftruncate(fd: fd_t, length: u64) TruncateError!void {
449	449	if (std.Target.current.os.tag == .windows) {
450		try windows.SetFilePointerEx_BEGIN(fd, length);
	450	var io_status_block: windows.IO_STATUS_BLOCK = undefined;
	451	var eof_info = windows.FILE_END_OF_FILE_INFORMATION{
	452	.EndOfFile = @bitCast(windows.LARGE_INTEGER, length),
	453	};
	454
	455	const rc = windows.ntdll.NtSetInformationFile(
	456	fd,
	457	&io_status_block,
	458	&eof_info,
	459	@sizeOf(windows.FILE_END_OF_FILE_INFORMATION),
	460	.FileEndOfFileInformation,
	461	);
451	462
452		if (windows.kernel32.SetEndOfFile(fd) == 0)
453		return TruncateError.Unexpected;
	463	switch (rc) {
	464	.SUCCESS => {},
	465	.INVALID_HANDLE => unreachable, // Handle not open for writing
	466	.ACCESS_DENIED => return error.CannotTruncate,
	467	else => return windows.unexpectedStatus(rc),
	468	}
454	469
455	470	return;
456	471	}
...	...	@@ -471,7 +486,8 @@ pub fn ftruncate(fd: fd_t, length: u64) TruncateError!void {
471	486	EIO => return error.InputOutput,
472	487	EPERM => return error.CannotTruncate,
473	488	ETXTBSY => return error.FileBusy,
474		EBADF, EINVAL => unreachable,
	489	EBADF => unreachable, // Handle not open for writing
	490	EINVAL => unreachable, // Handle not open for writing
475	491	else => \|err\| return unexpectedErrno(err),
476	492	}
477	493	}

lib/std/os/windows/bits.zig+4

...	...	@@ -225,6 +225,10 @@ pub const FILE_POSITION_INFORMATION = extern struct {
225	225	CurrentByteOffset: LARGE_INTEGER,
226	226	};
227	227
	228	pub const FILE_END_OF_FILE_INFORMATION = extern struct {
	229	EndOfFile: LARGE_INTEGER,
	230	};
	231
228	232	pub const FILE_MODE_INFORMATION = extern struct {
229	233	Mode: ULONG,
230	234	};

lib/std/os/windows/ntdll.zig+7

...	...	@@ -16,6 +16,13 @@ pub extern "NtDll" fn NtQueryInformationFile(
16	16	Length: ULONG,
17	17	FileInformationClass: FILE_INFORMATION_CLASS,
18	18	) callconv(.Stdcall) NTSTATUS;
	19	pub extern "NtDll" fn NtSetInformationFile(
	20	FileHandle: HANDLE,
	21	IoStatusBlock: *IO_STATUS_BLOCK,
	22	FileInformation: PVOID,
	23	Length: ULONG,
	24	FileInformationClass: FILE_INFORMATION_CLASS,
	25	) callconv(.Stdcall) NTSTATUS;
19	26
20	27	pub extern "NtDll" fn NtQueryAttributesFile(
21	28	ObjectAttributes: *OBJECT_ATTRIBUTES,