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Fix some invalid unicode handling issues with suspendable ports.

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Fixes <https://bugs.gnu.org/62290>.

Based on the implementation in ports.c.  I don't understand what this
code is really doing, but the suspendable ports implementation differs
from the similar C code for a couple of inequalities.

* module/ice-9/suspendable-ports.scm (decode-utf8, bad-utf8-len): Flip a
couple of inequalities.
* test-suite/tests/ports.test ("string ports"): Add additional invalid
UTF-8 test case.
* NEWS: Update.

Signed-off-by: Ludovic Courtès <ludo@gnu.org>
This commit is contained in:
Christopher Baines 2023-03-20 09:15:13 +00:00 • committed by Ludovic Courtès
parent ffb95239aa
commit cba2e7e3fe
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3 changed files with 14 additions and 4 deletions
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8
module/ice-9/suspendable-ports.scm
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@ -419,7 +419,7 @@
(= (logand u8_2 #xc0) #x80)
(case u8_0
((#xe0) (>= u8_1 #xa0))
((#xed) (>= u8_1 #x9f))
((#xed) (<= u8_1 #x9f))
(else #t)))
(kt (integer->char
(logior (ash (logand u8_0 #x0f) 12)
@ -436,7 +436,7 @@
(= (logand u8_3 #xc0) #x80)
(case u8_0
((#xf0) (>= u8_1 #x90))
((#xf4) (>= u8_1 #x8f))
((#xf4) (<= u8_1 #x8f))
(else #t)))
(kt (integer->char
(logior (ash (logand u8_0 #x07) 18)
@ -462,7 +462,7 @@
((< buffering 2) 1)
((not (= (logand (ref 1) #xc0) #x80)) 1)
((and (eq? first-byte #xe0) (< (ref 1) #xa0)) 1)
((and (eq? first-byte #xed) (< (ref 1) #x9f)) 1)
((and (eq? first-byte #xed) (> (ref 1) #x9f)) 1)
((< buffering 3) 2)
((not (= (logand (ref 2) #xc0) #x80)) 2)
(else 0)))
@ -471,7 +471,7 @@
((< buffering 2) 1)
((not (= (logand (ref 1) #xc0) #x80)) 1)
((and (eq? first-byte #xf0) (< (ref 1) #x90)) 1)
((and (eq? first-byte #xf4) (< (ref 1) #x8f)) 1)
((and (eq? first-byte #xf4) (> (ref 1) #x8f)) 1)
((< buffering 3) 2)
((not (= (logand (ref 2) #xc0) #x80)) 2)
((< buffering 4) 3)