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Re: Making custom binary input ports unbuffered
From: |
Ludovic Courtès |
Subject: |
Re: Making custom binary input ports unbuffered |
Date: |
Fri, 17 Jan 2014 00:00:45 +0100 |
User-agent: |
Gnus/5.130007 (Ma Gnus v0.7) Emacs/24.3 (gnu/linux) |
So here’s a version that adds a ‘setvbuf’ method to scm_t_port_internal,
and uses that to implement CBIP buffering. CBIPs remain fully buffered
by default (after more thoughts I considered that this conservative
approach was more reasonable and acceptable if documented.)
I’d like to commit to stable-2.0. WDYT?
Thanks,
Ludo’.
>From 1c5cc0ad6938443e9dc5271b6974a2c8df3b1909 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ludovic=20Court=C3=A8s?= <address@hidden>
Date: Thu, 16 Jan 2014 23:52:01 +0100
Subject: [PATCH 1/2] Prepare 'setvbuf' to support for non-file ports.
* libguile/ports-internal.h (struct scm_port_internal): Add
setvbuf' field. Change 'pending_eof' to a 1-bit unsigned char.
* libguile/ports.c (scm_new_port_table_entry): Clear 'pti->setvbuf'.
* libguile/fports.c (scm_setvbuf): Accept any open port, and error out
when PORT's setvbuf' field is NULL. Remove explicit 'scm_gc_free' calls.
(scm_i_fdes_to_port): Set PORT's 'setvbuf' field.
* test-suite/tests/ports.test ("setvbuf")["closed port", "string port"]:
New tests.
* doc/ref/posix.texi (Ports and File Descriptors): Suggest that
'setvbuf' works for different port types.
---
doc/ref/posix.texi | 3 +++
libguile/fports.c | 42 +++++++++++++++++++++++++++---------------
libguile/ports-internal.h | 14 ++++++++++++--
libguile/ports.c | 8 +++++++-
test-suite/tests/ports.test | 14 +++++++++++++-
5 files changed, 62 insertions(+), 19 deletions(-)
diff --git a/doc/ref/posix.texi b/doc/ref/posix.texi
index b3a6a04..56f5c78 100644
--- a/doc/ref/posix.texi
+++ b/doc/ref/posix.texi
@@ -470,6 +470,9 @@ line buffered
block buffered, using a newly allocated buffer of @var{size} bytes.
If @var{size} is omitted, a default size will be used.
@end defvar
+
+Only certain types of ports are supported, most importantly
+file ports.
@end deffn
@deffn {Scheme Procedure} fcntl port/fd cmd [value]
diff --git a/libguile/fports.c b/libguile/fports.c
index 70732e5..365d3ff 100644
--- a/libguile/fports.c
+++ b/libguile/fports.c
@@ -1,5 +1,6 @@
/* Copyright (C) 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003,
- * 2004, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013 Free Software
Foundation, Inc.
+ * 2004, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013,
+ * 2014 Free Software Foundation, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
@@ -58,6 +59,7 @@
#include "libguile/hashtab.h"
#include "libguile/fports.h"
+#include "libguile/ports-internal.h"
#if SIZEOF_OFF_T == SIZEOF_INT
#define OFF_T_MAX INT_MAX
@@ -78,10 +80,10 @@ scm_t_bits scm_tc16_fport;
/* default buffer size, used if the O/S won't supply a value. */
static const size_t default_buffer_size = 1024;
-/* create FPORT buffer with specified sizes (or -1 to use default size or
- 0 for no buffer. */
+/* Create FPORT buffers with specified sizes (or -1 to use default size
+ or 0 for no buffer.) */
static void
-scm_fport_buffer_add (SCM port, long read_size, int write_size)
+scm_fport_buffer_add (SCM port, long read_size, long write_size)
#define FUNC_NAME "scm_fport_buffer_add"
{
scm_t_port *pt = SCM_PTAB_ENTRY (port);
@@ -147,7 +149,9 @@ SCM_DEFINE (scm_setvbuf, "setvbuf", 2, 1, 0,
"@item _IOFBF\n"
"block buffered, using a newly allocated buffer of @var{size}
bytes.\n"
"If @var{size} is omitted, a default size will be used.\n"
- "@end table")
+ "@end table\n\n"
+ "Only certain types of ports are supported, most importantly\n"
+ "file ports.")
#define FUNC_NAME s_scm_setvbuf
{
int cmode;
@@ -155,10 +159,17 @@ SCM_DEFINE (scm_setvbuf, "setvbuf", 2, 1, 0,
size_t ndrained;
char *drained;
scm_t_port *pt;
+ scm_t_port_internal *pti;
port = SCM_COERCE_OUTPORT (port);
- SCM_VALIDATE_OPFPORT (1,port);
+ SCM_VALIDATE_OPENPORT (1, port);
+ pti = SCM_PORT_GET_INTERNAL (port);
+
+ if (pti->setvbuf == NULL)
+ scm_wrong_type_arg_msg (FUNC_NAME, 1, port,
+ "port that supports 'setvbuf'");
+
cmode = scm_to_int (mode);
if (cmode != _IONBF && cmode != _IOFBF && cmode != _IOLBF)
scm_out_of_range (FUNC_NAME, mode);
@@ -169,9 +180,8 @@ SCM_DEFINE (scm_setvbuf, "setvbuf", 2, 1, 0,
cmode = _IOFBF;
}
else
- {
- SCM_SET_CELL_WORD_0 (port, SCM_CELL_WORD_0 (port) &
~(scm_t_bits)SCM_BUFLINE);
- }
+ SCM_SET_CELL_WORD_0 (port,
+ SCM_CELL_WORD_0 (port) & ~(scm_t_bits) SCM_BUFLINE);
if (SCM_UNBNDP (size))
{
@@ -216,12 +226,8 @@ SCM_DEFINE (scm_setvbuf, "setvbuf", 2, 1, 0,
pt->read_end = pt->saved_read_end;
pt->read_buf_size = pt->saved_read_buf_size;
}
- if (pt->read_buf != &pt->shortbuf)
- scm_gc_free (pt->read_buf, pt->read_buf_size, "port buffer");
- if (pt->write_buf != &pt->shortbuf)
- scm_gc_free (pt->write_buf, pt->write_buf_size, "port buffer");
- scm_fport_buffer_add (port, csize, csize);
+ pti->setvbuf (port, csize, csize);
if (ndrained > 0)
/* Put DRAINED back to PORT. */
@@ -542,6 +548,7 @@ scm_i_fdes_to_port (int fdes, long mode_bits, SCM name)
{
SCM port;
scm_t_port *pt;
+ scm_t_port_internal *pti;
/* Test that fdes is valid. */
#ifdef F_GETFL
@@ -567,7 +574,12 @@ scm_i_fdes_to_port (int fdes, long mode_bits, SCM name)
port = scm_new_port_table_entry (scm_tc16_fport);
SCM_SET_CELL_TYPE(port, scm_tc16_fport | mode_bits);
- pt = SCM_PTAB_ENTRY(port);
+ pt = SCM_PTAB_ENTRY (port);
+
+ /* File ports support 'setvbuf'. */
+ pti = SCM_PORT_GET_INTERNAL (port);
+ pti->setvbuf = scm_fport_buffer_add;
+
{
scm_t_fport *fp
= (scm_t_fport *) scm_gc_malloc_pointerless (sizeof (scm_t_fport),
diff --git a/libguile/ports-internal.h b/libguile/ports-internal.h
index 8a3a00b..48dcaa7 100644
--- a/libguile/ports-internal.h
+++ b/libguile/ports-internal.h
@@ -1,7 +1,7 @@
/*
* ports-internal.h - internal-only declarations for ports.
*
- * Copyright (C) 2013 Free Software Foundation, Inc.
+ * Copyright (C) 2013, 2014 Free Software Foundation, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
@@ -50,7 +50,17 @@ struct scm_port_internal
unsigned at_stream_start_for_bom_write : 1;
scm_t_port_encoding_mode encoding_mode;
scm_t_iconv_descriptors *iconv_descriptors;
- int pending_eof;
+ unsigned char pending_eof: 1;
+
+ /* When non-NULL, this is the method called by 'setvbuf' for this port.
+ It must create read and write buffers for PORT with the specified
+ sizes (a size of 0 is for unbuffered ports, which should use the
+ 'shortbuf' field.) Size -1 means to use the port's preferred buffer
+ size. */
+ /* XXX: In 2.2 make this a property of the 'scm_t_ptob_descriptor'. */
+ void (*setvbuf) (SCM port, long read_size, long write_size);
+
+ /* Key-value properties. */
SCM alist;
};
diff --git a/libguile/ports.c b/libguile/ports.c
index 4516160..4f401de 100644
--- a/libguile/ports.c
+++ b/libguile/ports.c
@@ -1,5 +1,5 @@
/* Copyright (C) 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2003, 2004, 2006,
- * 2007, 2008, 2009, 2010, 2011, 2012, 2013 Free Software Foundation, Inc.
+ * 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014 Free Software Foundation,
Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
@@ -677,6 +677,12 @@ scm_new_port_table_entry (scm_t_bits tag)
pti->pending_eof = 0;
pti->alist = SCM_EOL;
+ /* Until Guile 2.0.9 included, 'setvbuf' would only work on file
+ ports. Now all port types can be supported, but it's not clear
+ that port types out in wild accept having someone else fiddle with
+ their buffer. Thus, conservatively turn it off by default. */
+ pti->setvbuf = NULL;
+
SCM_SET_CELL_TYPE (z, tag);
SCM_SETPTAB_ENTRY (z, entry);
diff --git a/test-suite/tests/ports.test b/test-suite/tests/ports.test
index 9b1c6c0..c2f4480 100644
--- a/test-suite/tests/ports.test
+++ b/test-suite/tests/ports.test
@@ -2,7 +2,7 @@
;;;; Jim Blandy <address@hidden> --- May 1999
;;;;
;;;; Copyright (C) 1999, 2001, 2004, 2006, 2007, 2009, 2010,
-;;;; 2011, 2012, 2013 Free Software Foundation, Inc.
+;;;; 2011, 2012, 2013, 2014 Free Software Foundation, Inc.
;;;;
;;;; This library is free software; you can redistribute it and/or
;;;; modify it under the terms of the GNU Lesser General Public
@@ -1499,6 +1499,18 @@
(with-test-prefix "setvbuf"
+ (pass-if-exception "closed port"
+ exception:wrong-type-arg
+ (let ((port (open-input-file "/dev/null")))
+ (close-port port)
+ (setvbuf port _IOFBF)))
+
+ (pass-if-exception "string port"
+ exception:wrong-type-arg
+ (let ((port (open-input-string "Hey!")))
+ (close-port port)
+ (setvbuf port _IOFBF)))
+
(pass-if "line/column number preserved"
;; In Guile 2.0.5, `setvbuf' would erroneously decrease the port's
;; line and/or column number.
--
1.8.4
>From 0fd3ab580b0bf71cf5133744f1b60499c23bbcb6 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ludovic=20Court=C3=A8s?= <address@hidden>
Date: Thu, 16 Jan 2014 23:43:31 +0100
Subject: [PATCH 2/2] Custom binary input ports support 'setvbuf'.
* libguile/r6rs-ports.c (CBIP_BUFFER_SIZE): Adjust comment. Set to 8KiB.
(SCM_SET_CBIP_BYTEVECTOR): New macro.
(cbip_setvbuf): New function.
(make_cbip): Set PORT's 'setvbuf' internal field.
(cbip_fill_input): Check whether PORT is buffered. When unbuffered,
check whether BV can hold C_REQUESTED bytes, and allocate a new
bytevector if not; copy the data back from BV to c_port->read_pos.
Remove 'again' label, and don't loop there.
* test-suite/tests/r6rs-ports.test ("7.2.7 Input Ports")["custom binary
input port unbuffered & 'port-position'", "custom binary input port
unbuffered & 'read!' calls", "custom binary input port, unbuffered
then buffered", "custom binary input port, buffered then unbuffered"]:
New tests.
* doc/ref/api-io.texi (R6RS Binary Input): Document the buffering of
custom binary input ports, and link to 'setvbuf'.
---
doc/ref/api-io.texi | 4 ++
libguile/r6rs-ports.c | 94 +++++++++++++++++++++++++-----
test-suite/tests/r6rs-ports.test | 123 +++++++++++++++++++++++++++++++++++++++
3 files changed, 205 insertions(+), 16 deletions(-)
diff --git a/doc/ref/api-io.texi b/doc/ref/api-io.texi
index f1170eb..02d92a2 100644
--- a/doc/ref/api-io.texi
+++ b/doc/ref/api-io.texi
@@ -1816,6 +1816,10 @@ indicating the position of the next byte is to read.
Finally, if @var{close} is not @code{#f}, it must be a thunk. It is
invoked when the custom binary input port is closed.
+The returned port is fully buffered by default, but its buffering mode
+can be changed using @code{setvbuf} (@pxref{Ports and File Descriptors,
address@hidden).
+
Using a custom binary input port, the @code{open-bytevector-input-port}
procedure could be implemented as follows:
diff --git a/libguile/r6rs-ports.c b/libguile/r6rs-ports.c
index 0b1d162..30456a8 100644
--- a/libguile/r6rs-ports.c
+++ b/libguile/r6rs-ports.c
@@ -37,6 +37,7 @@
#include "libguile/validate.h"
#include "libguile/values.h"
#include "libguile/vectors.h"
+#include "libguile/ports-internal.h"
@@ -280,18 +281,59 @@ cbp_close (SCM port)
static scm_t_bits custom_binary_input_port_type = 0;
-/* Size of the buffer embedded in custom binary input ports. */
-#define CBIP_BUFFER_SIZE 4096
+/* Initial size of the buffer embedded in custom binary input ports. */
+#define CBIP_BUFFER_SIZE 8192
/* Return the bytevector associated with PORT. */
#define SCM_CBIP_BYTEVECTOR(_port) \
SCM_SIMPLE_VECTOR_REF (SCM_PACK (SCM_STREAM (_port)), 4)
+/* Set BV as the bytevector associated with PORT. */
+#define SCM_SET_CBIP_BYTEVECTOR(_port, _bv) \
+ SCM_SIMPLE_VECTOR_SET (SCM_PACK (SCM_STREAM (_port)), 4, (_bv))
+
/* Return the various procedures of PORT. */
#define SCM_CBIP_READ_PROC(_port) \
SCM_SIMPLE_VECTOR_REF (SCM_PACK (SCM_STREAM (_port)), 0)
+/* Set PORT's internal buffer according to READ_SIZE. */
+static void
+cbip_setvbuf (SCM port, long read_size, long write_size)
+{
+ SCM bv;
+ scm_t_port *pt;
+
+ pt = SCM_PTAB_ENTRY (port);
+ bv = SCM_CBIP_BYTEVECTOR (port);
+
+ switch (read_size)
+ {
+ case 0:
+ /* Unbuffered: keep PORT's bytevector as is (it will be used in
+ future 'scm_c_read' calls), but point to the one-byte buffer. */
+ pt->read_buf = &pt->shortbuf;
+ pt->read_buf_size = 1;
+ break;
+
+ case -1:
+ /* Preferred size: keep the current bytevector and use it as the
+ backing store. */
+ pt->read_buf = (unsigned char *) SCM_BYTEVECTOR_CONTENTS (bv);
+ pt->read_buf_size = SCM_BYTEVECTOR_LENGTH (bv);
+ break;
+
+ default:
+ /* Fully buffered: allocate a buffer of READ_SIZE bytes. */
+ bv = scm_c_make_bytevector (read_size);
+ SCM_SET_CBIP_BYTEVECTOR (port, bv);
+ pt->read_buf = (unsigned char *) SCM_BYTEVECTOR_CONTENTS (bv);
+ pt->read_buf_size = read_size;
+ }
+
+ pt->read_pos = pt->read_end = pt->read_buf;
+}
+
static inline SCM
make_cbip (SCM read_proc, SCM get_position_proc,
SCM set_position_proc, SCM close_proc)
@@ -331,7 +373,10 @@ make_cbip (SCM read_proc, SCM get_position_proc,
c_port->read_end = (unsigned char *) c_bv;
c_port->read_buf_size = c_len;
- /* Mark PORT as open, readable and unbuffered (hmm, how elegant...). */
+ /* 'setvbuf' is supported. */
+ SCM_PORT_GET_INTERNAL (port)->setvbuf = cbip_setvbuf;
+
+ /* Mark PORT as open and readable. */
SCM_SET_CELL_TYPE (port, custom_binary_input_port_type | mode_bits);
scm_i_pthread_mutex_unlock (&scm_i_port_table_mutex);
@@ -346,26 +391,39 @@ cbip_fill_input (SCM port)
int result;
scm_t_port *c_port = SCM_PTAB_ENTRY (port);
- again:
if (c_port->read_pos >= c_port->read_end)
{
/* Invoke the user's `read!' procedure. */
+ int buffered;
size_t c_octets, c_requested;
SCM bv, read_proc, octets;
c_requested = c_port->read_buf_size;
+ read_proc = SCM_CBIP_READ_PROC (port);
- /* Use the bytevector associated with PORT as the buffer passed to the
- `read!' procedure, thereby avoiding additional allocations. */
bv = SCM_CBIP_BYTEVECTOR (port);
- read_proc = SCM_CBIP_READ_PROC (port);
+ buffered =
+ (c_port->read_buf == (unsigned char *) SCM_BYTEVECTOR_CONTENTS (bv));
- /* The assumption here is that C_PORT's internal buffer wasn't changed
- behind our back. */
- assert (c_port->read_buf ==
- (unsigned char *) SCM_BYTEVECTOR_CONTENTS (bv));
- assert ((unsigned) c_port->read_buf_size
- == SCM_BYTEVECTOR_LENGTH (bv));
+ if (buffered)
+ /* Make sure the buffer isn't corrupt. BV can be passed directly
+ to READ_PROC. */
+ assert (c_port->read_buf_size == SCM_BYTEVECTOR_LENGTH (bv));
+ else
+ {
+ /* This is an unbuffered port. When called via the
+ 'get-bytevector-*' procedures, and thus via 'scm_c_read', we
+ are passed the caller-provided buffer, so we need to check its
+ size. */
+ if (SCM_BYTEVECTOR_LENGTH (bv) < c_requested)
+ {
+ /* Bad luck: we have to make another allocation. Save that
+ bytevector for later reuse, in the hope that the application
+ has regular access patterns. */
+ bv = scm_c_make_bytevector (c_requested);
+ SCM_SET_CBIP_BYTEVECTOR (port, bv);
+ }
+ }
octets = scm_call_3 (read_proc, bv, SCM_INUM0,
scm_from_size_t (c_requested));
@@ -373,11 +431,15 @@ cbip_fill_input (SCM port)
if (SCM_UNLIKELY (c_octets > c_requested))
scm_out_of_range (FUNC_NAME, octets);
- c_port->read_pos = (unsigned char *) SCM_BYTEVECTOR_CONTENTS (bv);
+ if (!buffered)
+ /* Copy the data back to the internal buffer. */
+ memcpy ((char *) c_port->read_pos, SCM_BYTEVECTOR_CONTENTS (bv),
+ c_octets);
+
c_port->read_end = (unsigned char *) c_port->read_pos + c_octets;
- if (c_octets > 0)
- goto again;
+ if (c_octets != 0 || c_requested == 0)
+ result = (int) *c_port->read_pos;
else
result = EOF;
}
diff --git a/test-suite/tests/r6rs-ports.test b/test-suite/tests/r6rs-ports.test
index 2b62bed..213c8b7 100644
--- a/test-suite/tests/r6rs-ports.test
+++ b/test-suite/tests/r6rs-ports.test
@@ -456,6 +456,129 @@ not `set-port-position!'"
(u8-list->bytevector
(map char->integer (string->list "Port!")))))))
+ (pass-if-equal "custom binary input port unbuffered & 'port-position'"
+ '(0 2 5 11)
+ ;; Check that the value returned by 'port-position' is correct, and
+ ;; that each 'port-position' call leads one call to the
+ ;; 'get-position' method.
+ (let* ((str "Hello Port!")
+ (output (make-bytevector (string-length str)))
+ (source (with-fluids ((%default-port-encoding "UTF-8"))
+ (open-string-input-port str)))
+ (read! (lambda (bv start count)
+ (let ((r (get-bytevector-n! source bv start count)))
+ (if (eof-object? r)
+ 0
+ r))))
+ (pos '())
+ (get-pos (lambda ()
+ (let ((p (port-position source)))
+ (set! pos (cons p pos))
+ p)))
+ (port (make-custom-binary-input-port "the port" read!
+ get-pos #f #f)))
+ (setvbuf port _IONBF)
+ (and (= 0 (port-position port))
+ (begin
+ (get-bytevector-n! port output 0 2)
+ (= 2 (port-position port)))
+ (begin
+ (get-bytevector-n! port output 2 3)
+ (= 5 (port-position port)))
+ (let ((bv (string->utf8 (get-string-all port))))
+ (bytevector-copy! bv 0 output 5 (bytevector-length bv))
+ (= (string-length str) (port-position port)))
+ (bytevector=? output (string->utf8 str))
+ (reverse pos))))
+
+ (pass-if-equal "custom binary input port unbuffered & 'read!' calls"
+ `((2 "He") (3 "llo") (42 " Port!"))
+ (let* ((str "Hello Port!")
+ (source (with-fluids ((%default-port-encoding "UTF-8"))
+ (open-string-input-port str)))
+ (reads '())
+ (read! (lambda (bv start count)
+ (set! reads (cons count reads))
+ (let ((r (get-bytevector-n! source bv start count)))
+ (if (eof-object? r)
+ 0
+ r))))
+ (port (make-custom-binary-input-port "the port" read!
+ #f #f #f)))
+
+ (setvbuf port _IONBF)
+ (let ((ret (list (get-bytevector-n port 2)
+ (get-bytevector-n port 3)
+ (get-bytevector-n port 42))))
+ (zip (reverse reads)
+ (map (lambda (obj)
+ (if (bytevector? obj)
+ (utf8->string obj)
+ obj))
+ ret)))))
+
+ (pass-if-equal "custom binary input port, unbuffered then buffered"
+ `((6 "Lorem ") (12 "ipsum dolor ") (777 "sit amet, consectetur…")
+ (777 ,(eof-object)))
+ (let* ((str "Lorem ipsum dolor sit amet, consectetur…")
+ (source (with-fluids ((%default-port-encoding "UTF-8"))
+ (open-string-input-port str)))
+ (reads '())
+ (read! (lambda (bv start count)
+ (set! reads (cons count reads))
+ (let ((r (get-bytevector-n! source bv start count)))
+ (if (eof-object? r)
+ 0
+ r))))
+ (port (make-custom-binary-input-port "the port" read!
+ #f #f #f)))
+
+ (setvbuf port _IONBF)
+ (let ((ret (list (get-bytevector-n port 6)
+ (get-bytevector-n port 12)
+ (begin
+ (setvbuf port _IOFBF 777)
+ (get-bytevector-n port 42))
+ (get-bytevector-n port 42))))
+ (zip (reverse reads)
+ (map (lambda (obj)
+ (if (bytevector? obj)
+ (utf8->string obj)
+ obj))
+ ret)))))
+
+ (pass-if-equal "custom binary input port, buffered then unbuffered"
+ `((18
+ 42 14 ; scm_c_read tries to fill the 42-byte buffer
+ 42)
+ ("Lorem " "ipsum dolor " "sit amet, consectetur bla…" ,(eof-object)))
+ (let* ((str "Lorem ipsum dolor sit amet, consectetur bla…")
+ (source (with-fluids ((%default-port-encoding "UTF-8"))
+ (open-string-input-port str)))
+ (reads '())
+ (read! (lambda (bv start count)
+ (set! reads (cons count reads))
+ (let ((r (get-bytevector-n! source bv start count)))
+ (if (eof-object? r)
+ 0
+ r))))
+ (port (make-custom-binary-input-port "the port" read!
+ #f #f #f)))
+
+ (setvbuf port _IOFBF 18)
+ (let ((ret (list (get-bytevector-n port 6)
+ (get-bytevector-n port 12)
+ (begin
+ (setvbuf port _IONBF)
+ (get-bytevector-n port 42))
+ (get-bytevector-n port 42))))
+ (list (reverse reads)
+ (map (lambda (obj)
+ (if (bytevector? obj)
+ (utf8->string obj)
+ obj))
+ ret)))))
+
(pass-if "custom binary input port `close-proc' is called"
(let* ((closed? #f)
(read! (lambda (bv start count) 0))
--
1.8.4
- Making custom binary input ports unbuffered, Ludovic Courtès, 2014/01/14
- Re: Making custom binary input ports unbuffered, Mark H Weaver, 2014/01/15
- Re: Making custom binary input ports unbuffered, Ludovic Courtès, 2014/01/15
- Re: Making custom binary input ports unbuffered, Ludovic Courtès, 2014/01/15
- Re: Making custom binary input ports unbuffered, Mark H Weaver, 2014/01/15
- Re: Making custom binary input ports unbuffered,
Ludovic Courtès <=
- Re: Making custom binary input ports unbuffered, Ludovic Courtès, 2014/01/18
- Re: Making custom binary input ports unbuffered, Mark H Weaver, 2014/01/21
- Re: Making custom binary input ports unbuffered, Ludovic Courtès, 2014/01/21
- Re: Making custom binary input ports unbuffered, Mark H Weaver, 2014/01/21
- Re: Making custom binary input ports unbuffered, Ludovic Courtès, 2014/01/21