A name shows its own backslash as \\, and a terminal tag never carries a raw newline

With `\n` for a newline and `\xNN` for a bad byte, a name holding a
backslash and an n read back as one holding a newline. Names in /index,
the log and a terminal's tag now double their own backslashes; and a
terminal's directory with a newline no longer breaks its tag.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

1 files changed, 7 insertions, 0 deletions

diff --git a/src/ninep/ctl.zig b/src/ninep/ctl.zig
index 2958fc38..2b256b1e 100644
--- a/src/ninep/ctl.zig
+++ b/src/ninep/ctl.zig
@@ -1999,6 +1999,13 @@ test "/index shows a name as the log does: a newline in it is \\n, controls spac
     try testing.expect(std.mem.indexOf(u8, index, "/tmp/two\\nlines \\xff ") != null);
     try testing.expectEqual(@as(usize, 1), std.mem.count(u8, index, "\n"));
     try testing.expectEqual(@as(u64, index.len), call(p, .{ .tag = 1, .op = .getattr, .node = @intFromEnum(tree.TopFile.index) }).reply.attr.size);
+    // Its tag never carries the raw newline either.
+    const tag = rd(p, Node.of(serialOf(p), .tag), 0, 4096).bytes;
+    try testing.expect(std.mem.indexOf(u8, tag, "/tmp/two\\nlines") != null);
+    // A backslash of the name's own is doubled: `\n` written in a name
+    // reads back unlike a newline.
+    p.setCwd(term, "/tmp/back\\nslash");
+    try testing.expect(std.mem.indexOf(u8, rd(p, @intFromEnum(tree.TopFile.index), 0, 4096).bytes, "/tmp/back\\\\nslash") != null);
 }
 
 test "a served-tree pane spoils no Grep, and Look . from a gone directory is ENOENT, not /virtual/" {