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-rw-r--r--libguile/r6rs-ports.c4
-rw-r--r--test-suite/tests/r6rs-ports.test26
2 files changed, 28 insertions, 2 deletions
diff --git a/libguile/r6rs-ports.c b/libguile/r6rs-ports.c
index 445ae5464..49ca05325 100644
--- a/libguile/r6rs-ports.c
+++ b/libguile/r6rs-ports.c
@@ -1168,8 +1168,8 @@ SCM_DEFINE (scm_i_make_transcoded_port,
if (scm_is_true (scm_output_port_p (port)))
mode |= SCM_WRTNG;
- else if (scm_is_true (scm_input_port_p (port)))
- mode |= SCM_RDNG;
+ if (scm_is_true (scm_input_port_p (port)))
+ mode |= SCM_RDNG;
result = make_transcoded_port (port, mode);
diff --git a/test-suite/tests/r6rs-ports.test b/test-suite/tests/r6rs-ports.test
index 5b46cccd2..4d1981df2 100644
--- a/test-suite/tests/r6rs-ports.test
+++ b/test-suite/tests/r6rs-ports.test
@@ -919,6 +919,32 @@ not `set-port-position!'"
(with-test-prefix "8.2.6 Input and output ports"
+ (define (check-transcoded-port-mode make-port pred)
+ (let ((p (make-port "/dev/null" (file-options no-fail))))
+ (dynamic-wind
+ (lambda () #t)
+ (lambda ()
+ (set! p (transcoded-port p (native-transcoder)))
+ (pred p))
+ (lambda () (close-port p)))))
+
+ (pass-if "transcoded-port preserves input mode"
+ (check-transcoded-port-mode open-file-input-port
+ (lambda (p)
+ (and (input-port? p)
+ (not (output-port? p))))))
+
+ (pass-if "transcoded-port preserves output mode"
+ (check-transcoded-port-mode open-file-output-port
+ (lambda (p)
+ (and (not (input-port? p))
+ (output-port? p)))))
+
+ (pass-if "transcoded-port preserves input/output mode"
+ (check-transcoded-port-mode open-file-input/output-port
+ (lambda (p)
+ (and (input-port? p) (output-port? p)))))
+
(pass-if "transcoded-port [output]"
(let ((s "Hello\nÄÖÜ"))
(bytevector=?