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std: fix deprecated writer not handling the buffer

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This commit is contained in:
Andrew Kelley 2025-07-22 17:06:25 -07:00
parent 91640f5f81
commit ec5cdb2fe3
2 changed files with 12 additions and 2 deletions
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7
lib/std/Io.zig
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@ -419,9 +419,14 @@ pub fn GenericWriter(
new_interface: Writer,
err: ?Error = null,
fn drain(w: *Writer, data: []const []const u8, splat: usize) Writer.Error!usize {
fn drain(w: *std.io.Writer, data: []const []const u8, splat: usize) std.io.Writer.Error!usize {
_ = splat;
const a: *@This() = @alignCast(@fieldParentPtr("new_interface", w));
const buffered = w.buffered();
if (buffered.len != 0) return w.consume(a.derp_writer.write(buffered) catch |err| {
a.err = err;
return error.WriteFailed;
});
return a.derp_writer.write(data[0]) catch |err| {
a.err = err;
return error.WriteFailed;

7
lib/std/Io/DeprecatedWriter.zig
View File

@ -100,7 +100,12 @@ pub const Adapter = struct {
fn drain(w: *std.io.Writer, data: []const []const u8, splat: usize) std.io.Writer.Error!usize {
_ = splat;
const a: *@This() = @fieldParentPtr("new_interface", w);
const a: *@This() = @alignCast(@fieldParentPtr("new_interface", w));
const buffered = w.buffered();
if (buffered.len != 0) return w.consume(a.derp_writer.write(buffered) catch |err| {
a.err = err;
return error.WriteFailed;
});
return a.derp_writer.write(data[0]) catch |err| {
a.err = err;
return error.WriteFailed;