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fix: ioctl on stdin fd (0) first, then stdout fd, then env vars

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The user's terminal reports 186x60 via stty (which uses stdin fd)
and via COLUMNS/LINES, but ioctl on stdout's fd returns 80x24.
Priority: fd 0 → backend output fd → env vars → 80x24 fallback.
This commit is contained in:
Amr Gharbeia
2026-05-14 13:07:05 -04:00
parent 7813e27907
commit 4a86ae3274
2 changed files with 45 additions and 42 deletions
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42
src/backend/simple.lisp
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@@ -27,27 +27,27 @@
(values))
(defmethod backend-size ((b simple-backend))
(or (ignore-errors
(let* ((+tiocgwinsz+ 21523)
(winsize (sb-alien:make-alien sb-alien:unsigned-short 4)))
(unwind-protect
(progn
(sb-unix:unix-ioctl (sb-sys:fd-stream-fd
(backend-output-stream b))
+tiocgwinsz+
(sb-alien:alien-sap winsize))
(values (sb-alien:deref winsize 1)
(sb-alien:deref winsize 0)))
(sb-alien:free-alien winsize))))
;; $COLUMNS/$LINES fallback
(ignore-errors
(let* ((cstr (sb-ext:posix-getenv "COLUMNS"))
(rstr (sb-ext:posix-getenv "LINES"))
(cols (when cstr (parse-integer cstr :junk-allowed t)))
(rows (when rstr (parse-integer rstr :junk-allowed t))))
(when (and cols rows (> cols 0) (> rows 0))
(values cols rows))))
(values 80 24)))
(flet ((ioctl-size (fd)
(let* ((+tiocgwinsz+ 21523)
(winsize (sb-alien:make-alien sb-alien:unsigned-short 4)))
(unwind-protect
(progn
(sb-unix:unix-ioctl fd +tiocgwinsz+
(sb-alien:alien-sap winsize))
(values (sb-alien:deref winsize 1)
(sb-alien:deref winsize 0)))
(sb-alien:free-alien winsize)))))
(or (ignore-errors (ioctl-size 0))
(ignore-errors
(ioctl-size (sb-sys:fd-stream-fd (backend-output-stream b))))
(ignore-errors
(let* ((cstr (sb-ext:posix-getenv "COLUMNS"))
(rstr (sb-ext:posix-getenv "LINES"))
(cols (when cstr (parse-integer cstr :junk-allowed t)))
(rows (when rstr (parse-integer rstr :junk-allowed t))))
(when (and cols rows (> cols 0) (> rows 0))
(values cols rows))))
(values 80 24))))
(defmethod backend-write ((b simple-backend) string)
(let ((stream (backend-output-stream b)))