From: d4ryus via "Bug reports for GUILE, GNU's Ubiquitous Extension Language" <bug-guile@gnu.org>
To: 45816@debbugs.gnu.org
Subject: bug#45816: (ice-9 suspendable-ports):get-bytevector-some! is broken
Date: Tue, 12 Jan 2021 15:19:05 +0100 [thread overview]
Message-ID: <X/2v2XvE8XuIHwAv@gandalf.d4ryus.net> (raw)
[-- Attachment #1: Type: text/plain, Size: 1400 bytes --]
hi,
(ice-9 suspendable-ports):get-bytevector-some! calls bytevector-copy!
with transfer-size (which is a number) as third argument:
...
(define (get-bytevector-some! port bv start count)
(if (zero? count)
0
(call-with-values (lambda () (fill-input port 1 'binary))
(lambda (buf cur buffered)
(if (zero? buffered)
(begin
(set-port-buffer-has-eof?! buf #f)
the-eof-object)
(let ((transfer-size (min count buffered)))
(bytevector-copy! (port-buffer-bytevector buf) cur
transfer-size start buffered)
(set-port-buffer-cur! buf (+ cur transfer-size))
transfer-size))))))
...
The third argument to bytevector-copy! must be the target bytevector,
from the doc:
Scheme Procedure: bytevector-copy! source source-start target target-start len
Copy len bytes from source into target, starting reading from
source-start (a positive index within source) and start writing at
target-start. It is permitted for the source and target regions to
overlap.
I think the correct call is:
(bytevector-copy! (port-buffer-bytevector buf) cur
bv start transfer-size)
A potentional fix is attached.
If you need any additional information, please let me know.
- d4ryus
[-- Attachment #2: suspendable-get-bytevector-some-fix.patch --]
[-- Type: text/plain, Size: 609 bytes --]
diff --git a/module/ice-9/suspendable-ports.scm b/module/ice-9/suspendable-ports.scm
index f5f005cca..a823f1d37 100644
--- a/module/ice-9/suspendable-ports.scm
+++ b/module/ice-9/suspendable-ports.scm
@@ -338,7 +338,7 @@
the-eof-object)
(let ((transfer-size (min count buffered)))
(bytevector-copy! (port-buffer-bytevector buf) cur
- transfer-size start buffered)
+ bv start transfer-size)
(set-port-buffer-cur! buf (+ cur transfer-size))
transfer-size))))))
next reply other threads:[~2021-01-12 14:19 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-01-12 14:19 d4ryus via Bug reports for GUILE, GNU's Ubiquitous Extension Language [this message]
2021-05-06 10:46 ` bug#45816: (ice-9 suspendable-ports):get-bytevector-some! is broken d4ryus via Bug reports for GUILE, GNU's Ubiquitous Extension Language
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