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Fix decoding of evaluation results to support multibyte characters

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Symptom: (sclang-eval-sync "\"ö\"") evaluates to "ö"
After this patch: (sclang-eval-sync "\"ö\"") => "ö"

This was tricky to figure out, so here is a bit of background.
scel uses a so-called command FIFO to send (amongst other things) evaluation
results to Emacs.  This FIFO uses a pascal-string (32bit string length
followed by character data) to send Lisp to Emacs.  The command process
coding system is already set to 'no-conversion on the Emacs side
to avoid crippling the int32 at the beginning of every string.
However, the read-from-string call in sclang-command-process-filter
implicitly converts the unibyte string received from the process to
a multibyte string, without doing proper conversion.
The right function to use here is string-as-multibyte, which does
the correct conversion.
This commit is contained in:
Mario Lang 2019-12-17 08:32:05 +01:00
parent da28459931
commit 7285fb3358
1 changed files with 2 additions and 1 deletions
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3
el/sclang-interp.el
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@ -444,7 +444,8 @@ Change this if \"cat\" has a non-standard name or location."
(while (and (> (length string) 3)
(>= (length string)
(setq end (+ 4 (sclang-string-to-int32 string)))))
(sclang-handle-command-result (car (read-from-string string 4 end)))
(sclang-handle-command-result
(read (string-as-multibyte (substring string 4 end))))
(setq string (substring string end))))
(setq sclang-command-process-previous string))