GNU bug report logs - #70988
(read FUNCTION) uses Latin-1 [PATCH]

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Mattias Engdegård <mattias.engdegard <at> gmail.com>
To: Emacs Bug Report <bug-gnu-emacs <at> gnu.org>
Cc: Stefan Monnier <monnier <at> iro.umontreal.ca>
Subject: (read FUNCTION) uses Latin-1 [PATCH]
Date: Thu, 16 May 2024 20:13:18 +0200

[Message part 1 (text/plain, inline)]

When `read` is called with a function as stream argument, the return values of that function are often interpreted as Latin-1 characters with only the 8 low bits used. Example:

(let* ((next '(?A #x12a nil))
       (f (lambda (&rest args)
            (if args
                (push (car args) next)
              (pop next)))))
  (read f))
=> A*   ; expected: AĪ

This is a result of `readchar` setting *multibyte to 0 on this code path.

The reader is not very consistent: inside string and character literals, the code seems to work as expected.

The fix is straightforward (attached).

[read-from-function.diff (application/octet-stream, attachment)]

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