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-rw-r--r--module/rnrs/io/ports.scm19
1 files changed, 17 insertions, 2 deletions
diff --git a/module/rnrs/io/ports.scm b/module/rnrs/io/ports.scm
index 2968dbd9f..0cceb0672 100644
--- a/module/rnrs/io/ports.scm
+++ b/module/rnrs/io/ports.scm
@@ -63,6 +63,7 @@
call-with-bytevector-output-port
call-with-string-output-port
make-custom-textual-output-port
+ output-port-buffer-mode
flush-output-port
;; input/output ports
@@ -106,6 +107,9 @@
make-i/o-encoding-error i/o-encoding-error-char)
(import (ice-9 binary-ports)
(only (rnrs base) assertion-violation)
+ (only (ice-9 ports internal)
+ port-write-buffer port-buffer-bytevector port-line-buffered?)
+ (only (rnrs bytevectors) bytevector-length)
(rnrs enums)
(rnrs records syntactic)
(rnrs exceptions)
@@ -310,8 +314,9 @@ read from/written to in @var{port}."
(lambda ()
(with-fluids ((%default-port-encoding #f))
(open filename mode))))))
- (cond (transcoder
- (set-port-encoding! port (transcoder-codec transcoder))))
+ (setvbuf port buffer-mode)
+ (when transcoder
+ (set-port-encoding! port (transcoder-codec transcoder)))
port))
(define (file-options->mode file-options base-mode)
@@ -382,6 +387,16 @@ return the characters accumulated in that port."
close)
"w"))
+(define (output-port-buffer-mode port)
+ "Return @code{none} if @var{port} is unbuffered, @code{line} if it is
+line buffered, or @code{block} otherwise."
+ (let ((buffering (bytevector-length
+ (port-buffer-bytevector (port-write-buffer port)))))
+ (cond
+ ((= buffering 1) 'none)
+ ((port-line-buffered? port) 'line)
+ (else 'block))))
+
(define (flush-output-port port)
(force-output port))