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std: std.fs.File fix sendFile with buffered data

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fixes #25196

Co-authored-by: Andrew Kelley <andrew@ziglang.org>
This commit is contained in:
Maciej 'vesim' Kuliński 2025-09-14 17:26:55 +02:00 • committed by Andrew Kelley
parent f661ab6c36
commit 6682ff2e85
2 changed files with 36 additions and 1 deletions
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2
lib/std/fs/File.zig
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@ -1783,7 +1783,7 @@ pub const Writer = struct {
) std.Io.Writer.FileError!usize {
const reader_buffered = file_reader.interface.buffered();
if (reader_buffered.len >= @intFromEnum(limit))
return sendFileBuffered(io_w, file_reader, reader_buffered);
return sendFileBuffered(io_w, file_reader, limit.slice(reader_buffered));
const writer_buffered = io_w.buffered();
const file_limit = @intFromEnum(limit) - reader_buffered.len;
const w: *Writer = @alignCast(@fieldParentPtr("interface", io_w));

35
lib/std/fs/test.zig
View file

@ -1515,6 +1515,41 @@ test "sendfile" {
try testing.expectEqualStrings("header1\nsecond header\nine1\nsecontrailer1\nsecond trailer\n", written_buf[0..amt]);
}
test "sendfile with buffered data" {
var tmp = tmpDir(.{});
defer tmp.cleanup();
try tmp.dir.makePath("os_test_tmp");
var dir = try tmp.dir.openDir("os_test_tmp", .{});
defer dir.close();
var src_file = try dir.createFile("sendfile1.txt", .{ .read = true });
defer src_file.close();
try src_file.writeAll("AAAABBBB");
var dest_file = try dir.createFile("sendfile2.txt", .{ .read = true });
defer dest_file.close();
var src_buffer: [32]u8 = undefined;
var file_reader = src_file.reader(&src_buffer);
try file_reader.seekTo(0);
try file_reader.interface.fill(8);
var fallback_buffer: [32]u8 = undefined;
var file_writer = dest_file.writer(&fallback_buffer);
try std.testing.expectEqual(4, try file_writer.interface.sendFileAll(&file_reader, .limited(4)));
var written_buf: [8]u8 = undefined;
const amt = try dest_file.preadAll(&written_buf, 0);
try std.testing.expectEqual(4, amt);
try std.testing.expectEqualSlices(u8, "AAAA", written_buf[0..amt]);
}
test "copyRangeAll" {
var tmp = tmpDir(.{});
defer tmp.cleanup();