Round 39's small ones: a name write past its one line is refused by that write; Get and Edit's e load over a scratch under 100 bytes unasked, as Del closes it; Putall saves a Zerox pair once; bare Tab on the root ctl says the width as from a pane, and a ctl check of Tab no longer sets it; a directory read is "is a directory" (EISDIR), an unreadable file "permission denied" (EACCES), Incl of a file "not a directory" (ENOTDIR), and a device "not a regular file", never read to the stream limit

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

1 files changed, 7 insertions, 0 deletions

diff --git a/src/fs.zig b/src/fs.zig
index db07672e..fb76cee3 100644
--- a/src/fs.zig
+++ b/src/fs.zig
@@ -1521,6 +1521,13 @@ fn readFileLimit(gpa: std.mem.Allocator, path: []const u8, limit: usize) ![]u8 {
     };
     defer _ = libc.close(fd);
 
+    // A device (/dev/zero, a tty) is no file to read whole: said so, not
+    // read to the stream limit and called too large.
+    if (ninep_io.statNoFollow(path_z)) |facts| {
+        const kind = facts.mode & 0o170000;
+        if (kind == 0o040000) return error.IsDirectory;
+        if (kind == 0o020000 or kind == 0o060000) return error.NotAFile;
+    }
     const end = libc.lseek(fd, 0, libc.SEEK.END);
     // Not seekable: a pipe or a FIFO is no file; a regular file that is a
     // stream (a 9ns mount's log or screen, opened nonseekable) is read to