// Writer implements buffering for an [io.Writer] object.
// If an error occurs writing to a [Writer], no more data will be
// accepted and all subsequent writes, and [Writer.Flush], will return the error.
// After all data has been written, the client should call the
// [Writer.Flush] method to guarantee all data has been forwarded to
// the underlying [io.Writer].
type Writer struct {
	err error
	buf []byte
	n   int
	wr  io.Writer
}

pkg bufio, method (*Writer) Buffered() int
pkg bufio, method (*Writer) Flush() error
pkg bufio, method (*Writer) Write([]uint8) (int, error)
pkg bufio, method (*Writer) WriteByte(uint8) error
pkg bufio, method (*Writer) WriteRune(int32) (int, error)
pkg bufio, method (*Writer) WriteString(string) (int, error)
pkg bufio, method (ReadWriter) Available() int
pkg bufio, method (ReadWriter) Flush() error
pkg bufio, method (ReadWriter) Peek(int) ([]uint8, error)

pkg syscall (freebsd-riscv64), const IPV6_FW_DEL = 31 #53466
pkg syscall (freebsd-riscv64), const IPV6_FW_DEL ideal-int #53466
pkg syscall (freebsd-riscv64), const IPV6_FW_FLUSH = 32 #53466
pkg syscall (freebsd-riscv64), const IPV6_FW_FLUSH ideal-int #53466
pkg syscall (freebsd-riscv64), const IPV6_FW_GET = 34 #53466
pkg syscall (freebsd-riscv64), const IPV6_FW_GET ideal-int #53466

	n := len(data)
	f.buf.Write(data)
	// Flush to w until a potential match of exitRe
	b := f.buf.Bytes()
	match := f.exitRe.FindIndex(b)
	if match == nil {
		// Flush all of the buffer.
		_, err := f.w.Write(b)
		f.buf.Reset()
		if err != nil {
			return n, err
		}
	} else {
		// Flush up to the beginning of the (potential) match.
		_, err := f.w.Write(b[:match[0]])

pkg syscall (openbsd-386-cgo), type Timeval struct, Sec int32
pkg syscall (openbsd-amd64), const CCR0_FLUSH = 16
pkg syscall (openbsd-amd64), const CCR0_FLUSH ideal-int
pkg syscall (openbsd-amd64), const CPUID_CFLUSH = 524288
pkg syscall (openbsd-amd64), const CPUID_CFLUSH ideal-int
pkg syscall (openbsd-amd64), const EFER_LMA = 1024
pkg syscall (openbsd-amd64), const EFER_LMA ideal-int

	if w.cw.count != 0 {
		panic("zip: SetOffset called after data was written")
	}
	w.cw.count = n
}

// Flush flushes any buffered data to the underlying writer.
// Calling Flush is not normally necessary; calling Close is sufficient.
func (w *Writer) Flush() error {
	return w.cw.w.(*bufio.Writer).Flush()
}

// SetComment sets the end-of-central-directory comment field.
// It can only be called before [Writer.Close].

		_, err := f.Finish()
		// We should get a no exit code error
		if err == nil || !wantErr.MatchString(err.Error()) {
			t.Errorf("want error matching %s, got %s", wantErr, err)
		}
		// And it should flush all output (even if it looks
		// like we may be getting an exit code)
		if got := out.String(); text != got {
			t.Errorf("want full output %q, got %q", text, got)
		}
	}
	wantErr = regexp.MustCompile("^no exit code")

		file, line, fn := tab.PCToLine(pc)
		name := "?"
		if fn != nil {
			name = fn.Name
		} else {
			file = "?"
			line = 0
		}
		fmt.Fprintf(stdout, "%s\n%s:%d\n", name, file, line)
	}
	stdout.Flush()

		}
		if _, err := tw.Write([]byte("Kilts")); err != ErrWriteAfterClose {
			t.Fatalf("Write() = %v, want %v", err, ErrWriteAfterClose)
		}
		if err := tw.Flush(); err != ErrWriteAfterClose {
			t.Fatalf("Flush() = %v, want %v", err, ErrWriteAfterClose)
		}
		if err := tw.Close(); err != nil {
			t.Fatalf("Close() = %v, want nil", err)
		}
	})

	t.Run("PrematureFlush", func(t *testing.T) {

pkg syscall (openbsd-amd64), const BPF_X = 8
pkg syscall (openbsd-amd64), const BRKINT = 2
pkg syscall (openbsd-amd64), const CCR0_FLUSH = 16
pkg syscall (openbsd-amd64), const CFLUSH = 15
pkg syscall (openbsd-amd64), const CLOCAL = 32768
pkg syscall (openbsd-amd64), const CPUID_CFLUSH = 524288
pkg syscall (openbsd-amd64), const CREAD = 2048
pkg syscall (openbsd-amd64), const CS5 = 0