+
+;;; READ-LINE used to work on closed streams because input buffers were left in place
+(with-test (:name :bug-425)
+ ;; Normal close
+ (let ((f (open "stream.impure.lisp" :direction :input)))
+ (assert (stringp (read-line f)))
+ (close f)
+ (assert (eq :fii
+ (handler-case
+ (read-line f)
+ (sb-int:closed-stream-error () :fii)))))
+ ;; Abort
+ (let ((f (open "stream.impure.lisp" :direction :input)))
+ (assert (stringp (read-line f nil nil)))
+ (close f :abort t)
+ (assert (eq :faa
+ (handler-case
+ (read-line f)
+ (sb-int:closed-stream-error () :faa))))))
+
+(with-test (:name :regression-1.0.12.22)
+ (with-open-file (s "stream.impure.lisp" :direction :input)
+ (let ((buffer (make-string 20)))
+ (assert (= 2 (read-sequence buffer s :start 0 :end 2)))
+ (assert (= 3 (read-sequence buffer s :start 2 :end 3)))
+ (file-position s :end)
+ (assert (= 3 (read-sequence buffer s :start 3))))))
+
+;;; In 1.0.27 (and also 0.9.16; presumably in between, too), binary
+;;; input operations on a bivalent stream did something bad after
+;;; unread-char: READ-BYTE would return the character, and
+;;; READ-SEQUENCE into a byte buffer would lose when attempting to
+;;; store the character in the vector.
+(let ((pathname "bivalent-stream-unread-char-test.tmp"))
+ (with-open-file (s pathname
+ :element-type :default
+ :direction :io :if-exists :rename)
+ (write-char #\a s)
+ (file-position s :start)
+ (unread-char (read-char s) s)
+ (assert (integerp (read-byte s))))
+ (delete-file pathname))
+
+(let ((pathname "bivalent-stream-unread-char-test.tmp"))
+ (with-open-file (s pathname
+ :element-type :default
+ :direction :io :if-exists :rename)
+ (write-char #\a s)
+ (file-position s :start)
+ (unread-char (read-char s) s)
+ (assert (let ((buffer (make-array 10 :element-type '(unsigned-byte 8))))
+ (read-sequence buffer s))))
+ (delete-file pathname))
+
+#+sb-unicode
+(let ((pathname "bivalent-stream-unread-char-test.tmp"))
+ (with-open-file (s pathname
+ :element-type :default
+ :direction :io :if-exists :rename
+ :external-format :utf8)
+ (write-char (code-char 192) s)
+ (file-position s :start)
+ (unread-char (read-char s) s)
+ (assert (integerp (read-byte s))))
+ (delete-file pathname))
+
+#+sb-unicode
+(let ((pathname "bivalent-stream-unread-char-test.tmp"))
+ (with-open-file (s pathname
+ :element-type :default
+ :direction :io :if-exists :rename
+ :external-format :utf8)
+ (write-char (code-char 192) s)
+ (file-position s :start)
+ (unread-char (read-char s) s)
+ (assert (let ((buffer (make-array 10 :element-type '(unsigned-byte 8))))
+ (read-sequence buffer s))))
+ (delete-file pathname))