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/* GLIB - Library of useful routines for C programming
* Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
*
* giochannel.c: IO Channel abstraction
* Copyright 1998 Owen Taylor
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, see <http://www.gnu.org/licenses/>.
*/
/*
* Modified by the GLib Team and others 1997-2000. See the AUTHORS
* file for a list of people on the GLib Team. See the ChangeLog
* files for a list of changes. These files are distributed with
* GLib at ftp://ftp.gtk.org/pub/gtk/.
*/
/*
* MT safe
*/
#include "config.h"
#include <string.h>
#include <errno.h>
#include "giochannel.h"
#include "gstrfuncs.h"
#include "gtestutils.h"
#include "glibintl.h"
/**
* SECTION:iochannels
* @title: IO Channels
* @short_description: portable support for using files, pipes and sockets
* @see_also: g_io_add_watch(), g_io_add_watch_full(), g_source_remove(),
* #GMainLoop
*
* The #GIOChannel data type aims to provide a portable method for
* using file descriptors, pipes, and sockets, and integrating them
* into the [main event loop][glib-The-Main-Event-Loop]. Currently,
* full support is available on UNIX platforms, support for Windows
* is only partially complete.
*
* To create a new #GIOChannel on UNIX systems use
* g_io_channel_unix_new(). This works for plain file descriptors,
* pipes and sockets. Alternatively, a channel can be created for a
* file in a system independent manner using g_io_channel_new_file().
*
* Once a #GIOChannel has been created, it can be used in a generic
* manner with the functions g_io_channel_read_chars(),
* g_io_channel_write_chars(), g_io_channel_seek_position(), and
* g_io_channel_shutdown().
*
* To add a #GIOChannel to the [main event loop][glib-The-Main-Event-Loop],
* use g_io_add_watch() or g_io_add_watch_full(). Here you specify which
* events you are interested in on the #GIOChannel, and provide a
* function to be called whenever these events occur.
*
* #GIOChannel instances are created with an initial reference count of 1.
* g_io_channel_ref() and g_io_channel_unref() can be used to
* increment or decrement the reference count respectively. When the
* reference count falls to 0, the #GIOChannel is freed. (Though it
* isn't closed automatically, unless it was created using
* g_io_channel_new_file().) Using g_io_add_watch() or
* g_io_add_watch_full() increments a channel's reference count.
*
* The new functions g_io_channel_read_chars(),
* g_io_channel_read_line(), g_io_channel_read_line_string(),
* g_io_channel_read_to_end(), g_io_channel_write_chars(),
* g_io_channel_seek_position(), and g_io_channel_flush() should not be
* mixed with the deprecated functions g_io_channel_read(),
* g_io_channel_write(), and g_io_channel_seek() on the same channel.
**/
/**
* GIOChannel:
*
* A data structure representing an IO Channel. The fields should be
* considered private and should only be accessed with the following
* functions.
**/
/**
* GIOFuncs:
* @io_read: reads raw bytes from the channel. This is called from
* various functions such as g_io_channel_read_chars() to
* read raw bytes from the channel. Encoding and buffering
* issues are dealt with at a higher level.
* @io_write: writes raw bytes to the channel. This is called from
* various functions such as g_io_channel_write_chars() to
* write raw bytes to the channel. Encoding and buffering
* issues are dealt with at a higher level.
* @io_seek: (optional) seeks the channel. This is called from
* g_io_channel_seek() on channels that support it.
* @io_close: closes the channel. This is called from
* g_io_channel_close() after flushing the buffers.
* @io_create_watch: creates a watch on the channel. This call
* corresponds directly to g_io_create_watch().
* @io_free: called from g_io_channel_unref() when the channel needs to
* be freed. This function must free the memory associated
* with the channel, including freeing the #GIOChannel
* structure itself. The channel buffers have been flushed
* and possibly @io_close has been called by the time this
* function is called.
* @io_set_flags: sets the #GIOFlags on the channel. This is called
* from g_io_channel_set_flags() with all flags except
* for %G_IO_FLAG_APPEND and %G_IO_FLAG_NONBLOCK masked
* out.
* @io_get_flags: gets the #GIOFlags for the channel. This function
* need only return the %G_IO_FLAG_APPEND and
* %G_IO_FLAG_NONBLOCK flags; g_io_channel_get_flags()
* automatically adds the others as appropriate.
*
* A table of functions used to handle different types of #GIOChannel
* in a generic way.
**/
/**
* GIOStatus:
* @G_IO_STATUS_ERROR: An error occurred.
* @G_IO_STATUS_NORMAL: Success.
* @G_IO_STATUS_EOF: End of file.
* @G_IO_STATUS_AGAIN: Resource temporarily unavailable.
*
* Stati returned by most of the #GIOFuncs functions.
**/
/**
* GIOError:
* @G_IO_ERROR_NONE: no error
* @G_IO_ERROR_AGAIN: an EAGAIN error occurred
* @G_IO_ERROR_INVAL: an EINVAL error occurred
* @G_IO_ERROR_UNKNOWN: another error occurred
*
* #GIOError is only used by the deprecated functions
* g_io_channel_read(), g_io_channel_write(), and g_io_channel_seek().
**/
#define G_IO_NICE_BUF_SIZE 1024
/* This needs to be as wide as the largest character in any possible encoding */
#define MAX_CHAR_SIZE 10
/* Some simplifying macros, which reduce the need to worry whether the
* buffers have been allocated. These also make USE_BUF () an lvalue,
* which is used in g_io_channel_read_to_end ().
*/
#define USE_BUF(channel) ((channel)->encoding ? (channel)->encoded_read_buf \
: (channel)->read_buf)
#define BUF_LEN(string) ((string) ? (string)->len : 0)
static GIOError g_io_error_get_from_g_error (GIOStatus status,
GError *err);
static void g_io_channel_purge (GIOChannel *channel);
static GIOStatus g_io_channel_fill_buffer (GIOChannel *channel,
GError **err);
static GIOStatus g_io_channel_read_line_backend (GIOChannel *channel,
gsize *length,
gsize *terminator_pos,
GError **error);
/**
* g_io_channel_init:
* @channel: a #GIOChannel
*
* Initializes a #GIOChannel struct.
*
* This is called by each of the above functions when creating a
* #GIOChannel, and so is not often needed by the application
* programmer (unless you are creating a new type of #GIOChannel).
*/
void
g_io_channel_init (GIOChannel *channel)
{
channel->ref_count = 1;
channel->encoding = g_strdup ("UTF-8");
channel->line_term = NULL;
channel->line_term_len = 0;
channel->buf_size = G_IO_NICE_BUF_SIZE;
channel->read_cd = (GIConv) -1;
channel->write_cd = (GIConv) -1;
channel->read_buf = NULL; /* Lazy allocate buffers */
channel->encoded_read_buf = NULL;
channel->write_buf = NULL;
channel->partial_write_buf[0] = '\0';
channel->use_buffer = TRUE;
channel->do_encode = FALSE;
channel->close_on_unref = FALSE;
}
/**
* g_io_channel_ref:
* @channel: a #GIOChannel
*
* Increments the reference count of a #GIOChannel.
*
* Returns: the @channel that was passed in (since 2.6)
*/
GIOChannel *
g_io_channel_ref (GIOChannel *channel)
{
g_return_val_if_fail (channel != NULL, NULL);
g_atomic_int_inc (&channel->ref_count);
return channel;
}
/**
* g_io_channel_unref:
* @channel: a #GIOChannel
*
* Decrements the reference count of a #GIOChannel.
*/
void
g_io_channel_unref (GIOChannel *channel)
{
gboolean is_zero;
g_return_if_fail (channel != NULL);
is_zero = g_atomic_int_dec_and_test (&channel->ref_count);
if (G_UNLIKELY (is_zero))
{
if (channel->close_on_unref)
g_io_channel_shutdown (channel, TRUE, NULL);
else
g_io_channel_purge (channel);
g_free (channel->encoding);
if (channel->read_cd != (GIConv) -1)
g_iconv_close (channel->read_cd);
if (channel->write_cd != (GIConv) -1)
g_iconv_close (channel->write_cd);
g_free (channel->line_term);
if (channel->read_buf)
g_string_free (channel->read_buf, TRUE);
if (channel->write_buf)
g_string_free (channel->write_buf, TRUE);
if (channel->encoded_read_buf)
g_string_free (channel->encoded_read_buf, TRUE);
channel->funcs->io_free (channel);
}
}
static GIOError
g_io_error_get_from_g_error (GIOStatus status,
GError *err)
{
switch (status)
{
case G_IO_STATUS_NORMAL:
case G_IO_STATUS_EOF:
return G_IO_ERROR_NONE;
case G_IO_STATUS_AGAIN:
return G_IO_ERROR_AGAIN;
case G_IO_STATUS_ERROR:
g_return_val_if_fail (err != NULL, G_IO_ERROR_UNKNOWN);
if (err->domain != G_IO_CHANNEL_ERROR)
return G_IO_ERROR_UNKNOWN;
switch (err->code)
{
case G_IO_CHANNEL_ERROR_INVAL:
return G_IO_ERROR_INVAL;
default:
return G_IO_ERROR_UNKNOWN;
}
default:
g_assert_not_reached ();
}
}
/**
* g_io_channel_read:
* @channel: a #GIOChannel
* @buf: a buffer to read the data into (which should be at least
* count bytes long)
* @count: the number of bytes to read from the #GIOChannel
* @bytes_read: returns the number of bytes actually read
*
* Reads data from a #GIOChannel.
*
* Returns: %G_IO_ERROR_NONE if the operation was successful.
*
* Deprecated:2.2: Use g_io_channel_read_chars() instead.
**/
GIOError
g_io_channel_read (GIOChannel *channel,
gchar *buf,
gsize count,
gsize *bytes_read)
{
GError *err = NULL;
GIOError error;
GIOStatus status;
g_return_val_if_fail (channel != NULL, G_IO_ERROR_UNKNOWN);
g_return_val_if_fail (bytes_read != NULL, G_IO_ERROR_UNKNOWN);
if (count == 0)
{
if (bytes_read)
*bytes_read = 0;
return G_IO_ERROR_NONE;
}
g_return_val_if_fail (buf != NULL, G_IO_ERROR_UNKNOWN);
status = channel->funcs->io_read (channel, buf, count, bytes_read, &err);
error = g_io_error_get_from_g_error (status, err);
if (err)
g_error_free (err);
return error;
}
/**
* g_io_channel_write:
* @channel: a #GIOChannel
* @buf: the buffer containing the data to write
* @count: the number of bytes to write
* @bytes_written: the number of bytes actually written
*
* Writes data to a #GIOChannel.
*
* Returns: %G_IO_ERROR_NONE if the operation was successful.
*
* Deprecated:2.2: Use g_io_channel_write_chars() instead.
**/
GIOError
g_io_channel_write (GIOChannel *channel,
const gchar *buf,
gsize count,
gsize *bytes_written)
{
GError *err = NULL;
GIOError error;
GIOStatus status;
g_return_val_if_fail (channel != NULL, G_IO_ERROR_UNKNOWN);
g_return_val_if_fail (bytes_written != NULL, G_IO_ERROR_UNKNOWN);
status = channel->funcs->io_write (channel, buf, count, bytes_written, &err);
error = g_io_error_get_from_g_error (status, err);
if (err)
g_error_free (err);
return error;
}
/**
* g_io_channel_seek:
* @channel: a #GIOChannel
* @offset: an offset, in bytes, which is added to the position specified
* by @type
* @type: the position in the file, which can be %G_SEEK_CUR (the current
* position), %G_SEEK_SET (the start of the file), or %G_SEEK_END
* (the end of the file)
*
* Sets the current position in the #GIOChannel, similar to the standard
* library function fseek().
*
* Returns: %G_IO_ERROR_NONE if the operation was successful.
*
* Deprecated:2.2: Use g_io_channel_seek_position() instead.
**/
GIOError
g_io_channel_seek (GIOChannel *channel,
gint64 offset,
GSeekType type)
{
GError *err = NULL;
GIOError error;
GIOStatus status;
g_return_val_if_fail (channel != NULL, G_IO_ERROR_UNKNOWN);
g_return_val_if_fail (channel->is_seekable, G_IO_ERROR_UNKNOWN);
switch (type)
{
case G_SEEK_CUR:
case G_SEEK_SET:
case G_SEEK_END:
break;
default:
g_warning ("g_io_channel_seek: unknown seek type");
return G_IO_ERROR_UNKNOWN;
}
status = channel->funcs->io_seek (channel, offset, type, &err);
error = g_io_error_get_from_g_error (status, err);
if (err)
g_error_free (err);
return error;
}
/* The function g_io_channel_new_file() is prototyped in both
* giounix.c and giowin32.c, so we stick its documentation here.
*/
/**
* g_io_channel_new_file:
* @filename: (type filename): A string containing the name of a file
* @mode: One of "r", "w", "a", "r+", "w+", "a+". These have
* the same meaning as in fopen()
* @error: A location to return an error of type %G_FILE_ERROR
*
* Open a file @filename as a #GIOChannel using mode @mode. This
* channel will be closed when the last reference to it is dropped,
* so there is no need to call g_io_channel_close() (though doing
* so will not cause problems, as long as no attempt is made to
* access the channel after it is closed).
*
* Returns: A #GIOChannel on success, %NULL on failure.
**/
/**
* g_io_channel_close:
* @channel: A #GIOChannel
*
* Close an IO channel. Any pending data to be written will be
* flushed, ignoring errors. The channel will not be freed until the
* last reference is dropped using g_io_channel_unref().
*
* Deprecated:2.2: Use g_io_channel_shutdown() instead.
**/
void
g_io_channel_close (GIOChannel *channel)
{
GError *err = NULL;
g_return_if_fail (channel != NULL);
g_io_channel_purge (channel);
channel->funcs->io_close (channel, &err);
if (err)
{ /* No way to return the error */
g_warning ("Error closing channel: %s", err->message);
g_error_free (err);
}
channel->close_on_unref = FALSE; /* Because we already did */
channel->is_readable = FALSE;
channel->is_writeable = FALSE;
channel->is_seekable = FALSE;
}
/**
* g_io_channel_shutdown:
* @channel: a #GIOChannel
* @flush: if %TRUE, flush pending
* @err: location to store a #GIOChannelError
*
* Close an IO channel. Any pending data to be written will be
* flushed if @flush is %TRUE. The channel will not be freed until the
* last reference is dropped using g_io_channel_unref().
*
* Returns: the status of the operation.
**/
GIOStatus
g_io_channel_shutdown (GIOChannel *channel,
gboolean flush,
GError **err)
{
GIOStatus status, result;
GError *tmperr = NULL;
g_return_val_if_fail (channel != NULL, G_IO_STATUS_ERROR);
g_return_val_if_fail (err == NULL || *err == NULL, G_IO_STATUS_ERROR);
if (channel->write_buf && channel->write_buf->len > 0)
{
if (flush)
{
GIOFlags flags;
/* Set the channel to blocking, to avoid a busy loop
*/
flags = g_io_channel_get_flags (channel);
/* Ignore any errors here, they're irrelevant */
g_io_channel_set_flags (channel, flags & ~G_IO_FLAG_NONBLOCK, NULL);
result = g_io_channel_flush (channel, &tmperr);
}
else
result = G_IO_STATUS_NORMAL;
g_string_truncate(channel->write_buf, 0);
}
else
result = G_IO_STATUS_NORMAL;
if (channel->partial_write_buf[0] != '\0')
{
if (flush)
g_warning ("Partial character at end of write buffer not flushed.");
channel->partial_write_buf[0] = '\0';
}
status = channel->funcs->io_close (channel, err);
channel->close_on_unref = FALSE; /* Because we already did */
channel->is_readable = FALSE;
channel->is_writeable = FALSE;
channel->is_seekable = FALSE;
if (status != G_IO_STATUS_NORMAL)
{
g_clear_error (&tmperr);
return status;
}
else if (result != G_IO_STATUS_NORMAL)
{
g_propagate_error (err, tmperr);
return result;
}
else
return G_IO_STATUS_NORMAL;
}
/* This function is used for the final flush on close or unref */
static void
g_io_channel_purge (GIOChannel *channel)
{
GError *err = NULL;
GIOStatus status G_GNUC_UNUSED;
g_return_if_fail (channel != NULL);
if (channel->write_buf && channel->write_buf->len > 0)
{
GIOFlags flags;
/* Set the channel to blocking, to avoid a busy loop
*/
flags = g_io_channel_get_flags (channel);
g_io_channel_set_flags (channel, flags & ~G_IO_FLAG_NONBLOCK, NULL);
status = g_io_channel_flush (channel, &err);
if (err)
{ /* No way to return the error */
g_warning ("Error flushing string: %s", err->message);
g_error_free (err);
}
}
/* Flush these in case anyone tries to close without unrefing */
if (channel->read_buf)
g_string_truncate (channel->read_buf, 0);
if (channel->write_buf)
g_string_truncate (channel->write_buf, 0);
if (channel->encoding)
{
if (channel->encoded_read_buf)
g_string_truncate (channel->encoded_read_buf, 0);
if (channel->partial_write_buf[0] != '\0')
{
g_warning ("Partial character at end of write buffer not flushed.");
channel->partial_write_buf[0] = '\0';
}
}
}
/**
* g_io_create_watch:
* @channel: a #GIOChannel to watch
* @condition: conditions to watch for
*
* Creates a #GSource that's dispatched when @condition is met for the
* given @channel. For example, if condition is #G_IO_IN, the source will
* be dispatched when there's data available for reading.
*
* g_io_add_watch() is a simpler interface to this same functionality, for
* the case where you want to add the source to the default main loop context
* at the default priority.
*
* On Windows, polling a #GSource created to watch a channel for a socket
* puts the socket in non-blocking mode. This is a side-effect of the
* implementation and unavoidable.
*
* Returns: a new #GSource
*/
GSource *
g_io_create_watch (GIOChannel *channel,
GIOCondition condition)
{
g_return_val_if_fail (channel != NULL, NULL);
return channel->funcs->io_create_watch (channel, condition);
}
/**
* g_io_add_watch_full: (rename-to g_io_add_watch)
* @channel: a #GIOChannel
* @priority: the priority of the #GIOChannel source
* @condition: the condition to watch for
* @func: the function to call when the condition is satisfied
* @user_data: user data to pass to @func
* @notify: the function to call when the source is removed
*
* Adds the #GIOChannel into the default main loop context
* with the given priority.
*
* This internally creates a main loop source using g_io_create_watch()
* and attaches it to the main loop context with g_source_attach().
* You can do these steps manually if you need greater control.
*
* Returns: the event source id
*/
guint
g_io_add_watch_full (GIOChannel *channel,
gint priority,
GIOCondition condition,
GIOFunc func,
gpointer user_data,
GDestroyNotify notify)
{
GSource *source;
guint id;
g_return_val_if_fail (channel != NULL, 0);
source = g_io_create_watch (channel, condition);
if (priority != G_PRIORITY_DEFAULT)
g_source_set_priority (source, priority);
g_source_set_callback (source, (GSourceFunc)func, user_data, notify);
id = g_source_attach (source, NULL);
g_source_unref (source);
return id;
}
/**
* g_io_add_watch:
* @channel: a #GIOChannel
* @condition: the condition to watch for
* @func: the function to call when the condition is satisfied
* @user_data: user data to pass to @func
*
* Adds the #GIOChannel into the default main loop context
* with the default priority.
*
* Returns: the event source id
*/
/**
* GIOFunc:
* @source: the #GIOChannel event source
* @condition: the condition which has been satisfied
* @data: user data set in g_io_add_watch() or g_io_add_watch_full()
*
* Specifies the type of function passed to g_io_add_watch() or
* g_io_add_watch_full(), which is called when the requested condition
* on a #GIOChannel is satisfied.
*
* Returns: the function should return %FALSE if the event source
* should be removed
**/
/**
* GIOCondition:
* @G_IO_IN: There is data to read.
* @G_IO_OUT: Data can be written (without blocking).
* @G_IO_PRI: There is urgent data to read.
* @G_IO_ERR: Error condition.
* @G_IO_HUP: Hung up (the connection has been broken, usually for
* pipes and sockets).
* @G_IO_NVAL: Invalid request. The file descriptor is not open.
*
* A bitwise combination representing a condition to watch for on an
* event source.
**/
guint
g_io_add_watch (GIOChannel *channel,
GIOCondition condition,
GIOFunc func,
gpointer user_data)
{
return g_io_add_watch_full (channel, G_PRIORITY_DEFAULT, condition, func, user_data, NULL);
}
/**
* g_io_channel_get_buffer_condition:
* @channel: A #GIOChannel
*
* This function returns a #GIOCondition depending on whether there
* is data to be read/space to write data in the internal buffers in
* the #GIOChannel. Only the flags %G_IO_IN and %G_IO_OUT may be set.
*
* Returns: A #GIOCondition
**/
GIOCondition
g_io_channel_get_buffer_condition (GIOChannel *channel)
{
GIOCondition condition = 0;
if (channel->encoding)
{
if (channel->encoded_read_buf && (channel->encoded_read_buf->len > 0))
condition |= G_IO_IN; /* Only return if we have full characters */
}
else
{
if (channel->read_buf && (channel->read_buf->len > 0))
condition |= G_IO_IN;
}
if (channel->write_buf && (channel->write_buf->len < channel->buf_size))
condition |= G_IO_OUT;
return condition;
}
/**
* g_io_channel_error_from_errno:
* @en: an `errno` error number, e.g. `EINVAL`
*
* Converts an `errno` error number to a #GIOChannelError.
*
* Returns: a #GIOChannelError error number, e.g.
* %G_IO_CHANNEL_ERROR_INVAL.
**/
GIOChannelError
g_io_channel_error_from_errno (gint en)
{
#ifdef EAGAIN
g_return_val_if_fail (en != EAGAIN, G_IO_CHANNEL_ERROR_FAILED);
#endif
switch (en)
{
#ifdef EBADF
case EBADF:
g_warning ("Invalid file descriptor.");
return G_IO_CHANNEL_ERROR_FAILED;
#endif
#ifdef EFAULT
case EFAULT:
g_warning ("Buffer outside valid address space.");
return G_IO_CHANNEL_ERROR_FAILED;
#endif
#ifdef EFBIG
case EFBIG:
return G_IO_CHANNEL_ERROR_FBIG;
#endif
#ifdef EINTR
/* In general, we should catch EINTR before we get here,
* but close() is allowed to return EINTR by POSIX, so
* we need to catch it here; EINTR from close() is
* unrecoverable, because it's undefined whether
* the fd was actually closed or not, so we just return
* a generic error code.
*/
case EINTR:
return G_IO_CHANNEL_ERROR_FAILED;
#endif
#ifdef EINVAL
case EINVAL:
return G_IO_CHANNEL_ERROR_INVAL;
#endif
#ifdef EIO
case EIO:
return G_IO_CHANNEL_ERROR_IO;
#endif
#ifdef EISDIR
case EISDIR:
return G_IO_CHANNEL_ERROR_ISDIR;
#endif
#ifdef ENOSPC
case ENOSPC:
return G_IO_CHANNEL_ERROR_NOSPC;
#endif
#ifdef ENXIO
case ENXIO:
return G_IO_CHANNEL_ERROR_NXIO;
#endif
#ifdef EOVERFLOW
#if EOVERFLOW != EFBIG
case EOVERFLOW:
return G_IO_CHANNEL_ERROR_OVERFLOW;
#endif
#endif
#ifdef EPIPE
case EPIPE:
return G_IO_CHANNEL_ERROR_PIPE;
#endif
default:
return G_IO_CHANNEL_ERROR_FAILED;
}
}
/**
* g_io_channel_set_buffer_size:
* @channel: a #GIOChannel
* @size: the size of the buffer, or 0 to let GLib pick a good size
*
* Sets the buffer size.
**/
void
g_io_channel_set_buffer_size (GIOChannel *channel,
gsize size)
{
g_return_if_fail (channel != NULL);
if (size == 0)
size = G_IO_NICE_BUF_SIZE;
if (size < MAX_CHAR_SIZE)
size = MAX_CHAR_SIZE;
channel->buf_size = size;
}
/**
* g_io_channel_get_buffer_size:
* @channel: a #GIOChannel
*
* Gets the buffer size.
*
* Returns: the size of the buffer.
**/
gsize
g_io_channel_get_buffer_size (GIOChannel *channel)
{
g_return_val_if_fail (channel != NULL, 0);
return channel->buf_size;
}
/**
* g_io_channel_set_line_term:
* @channel: a #GIOChannel
* @line_term: (nullable): The line termination string. Use %NULL for
* autodetect. Autodetection breaks on "\n", "\r\n", "\r", "\0",
* and the Unicode paragraph separator. Autodetection should not be
* used for anything other than file-based channels.
* @length: The length of the termination string. If -1 is passed, the
* string is assumed to be nul-terminated. This option allows
* termination strings with embedded nuls.
*
* This sets the string that #GIOChannel uses to determine
* where in the file a line break occurs.
**/
void
g_io_channel_set_line_term (GIOChannel *channel,
const gchar *line_term,
gint length)
{
g_return_if_fail (channel != NULL);
g_return_if_fail (line_term == NULL || length != 0); /* Disallow "" */
if (line_term == NULL)
length = 0;
else if (length < 0)
length = strlen (line_term);
g_free (channel->line_term);
channel->line_term = line_term ? g_memdup (line_term, length) : NULL;
channel->line_term_len = length;
}
/**
* g_io_channel_get_line_term:
* @channel: a #GIOChannel
* @length: a location to return the length of the line terminator
*
* This returns the string that #GIOChannel uses to determine
* where in the file a line break occurs. A value of %NULL
* indicates autodetection.
*
* Returns: The line termination string. This value
* is owned by GLib and must not be freed.
**/
const gchar *
g_io_channel_get_line_term (GIOChannel *channel,
gint *length)
{
g_return_val_if_fail (channel != NULL, NULL);
if (length)
*length = channel->line_term_len;
return channel->line_term;
}
/**
* g_io_channel_set_flags:
* @channel: a #GIOChannel
* @flags: the flags to set on the IO channel
* @error: A location to return an error of type #GIOChannelError
*
* Sets the (writeable) flags in @channel to (@flags & %G_IO_FLAG_SET_MASK).
*
* Returns: the status of the operation.
**/
/**
* GIOFlags:
* @G_IO_FLAG_APPEND: turns on append mode, corresponds to %O_APPEND
* (see the documentation of the UNIX open() syscall)
* @G_IO_FLAG_NONBLOCK: turns on nonblocking mode, corresponds to
* %O_NONBLOCK/%O_NDELAY (see the documentation of the UNIX open()
* syscall)
* @G_IO_FLAG_IS_READABLE: indicates that the io channel is readable.
* This flag cannot be changed.
* @G_IO_FLAG_IS_WRITABLE: indicates that the io channel is writable.
* This flag cannot be changed.
* @G_IO_FLAG_IS_WRITEABLE: a misspelled version of @G_IO_FLAG_IS_WRITABLE
* that existed before the spelling was fixed in GLib 2.30. It is kept
* here for compatibility reasons. Deprecated since 2.30
* @G_IO_FLAG_IS_SEEKABLE: indicates that the io channel is seekable,
* i.e. that g_io_channel_seek_position() can be used on it.
* This flag cannot be changed.
* @G_IO_FLAG_MASK: the mask that specifies all the valid flags.
* @G_IO_FLAG_GET_MASK: the mask of the flags that are returned from
* g_io_channel_get_flags()
* @G_IO_FLAG_SET_MASK: the mask of the flags that the user can modify
* with g_io_channel_set_flags()
*
* Specifies properties of a #GIOChannel. Some of the flags can only be
* read with g_io_channel_get_flags(), but not changed with
* g_io_channel_set_flags().
*/
GIOStatus
g_io_channel_set_flags (GIOChannel *channel,
GIOFlags flags,
GError **error)
{
g_return_val_if_fail (channel != NULL, G_IO_STATUS_ERROR);
g_return_val_if_fail ((error == NULL) || (*error == NULL),
G_IO_STATUS_ERROR);
return (*channel->funcs->io_set_flags) (channel,
flags & G_IO_FLAG_SET_MASK,
error);
}
/**
* g_io_channel_get_flags:
* @channel: a #GIOChannel
*
* Gets the current flags for a #GIOChannel, including read-only
* flags such as %G_IO_FLAG_IS_READABLE.
*
* The values of the flags %G_IO_FLAG_IS_READABLE and %G_IO_FLAG_IS_WRITABLE
* are cached for internal use by the channel when it is created.
* If they should change at some later point (e.g. partial shutdown
* of a socket with the UNIX shutdown() function), the user
* should immediately call g_io_channel_get_flags() to update
* the internal values of these flags.
*
* Returns: the flags which are set on the channel
**/
GIOFlags
g_io_channel_get_flags (GIOChannel *channel)
{
GIOFlags flags;
g_return_val_if_fail (channel != NULL, 0);
flags = (* channel->funcs->io_get_flags) (channel);
/* Cross implementation code */
if (channel->is_seekable)
flags |= G_IO_FLAG_IS_SEEKABLE;
if (channel->is_readable)
flags |= G_IO_FLAG_IS_READABLE;
if (channel->is_writeable)
flags |= G_IO_FLAG_IS_WRITABLE;
return flags;
}
/**
* g_io_channel_set_close_on_unref:
* @channel: a #GIOChannel
* @do_close: Whether to close the channel on the final unref of
* the GIOChannel data structure.
*
* Whether to close the channel on the final unref of the #GIOChannel
* data structure. The default value of this is %TRUE for channels
* created by g_io_channel_new_file (), and %FALSE for all other channels.
*
* Setting this flag to %TRUE for a channel you have already closed
* can cause problems when the final reference to the #GIOChannel is dropped.
**/
void
g_io_channel_set_close_on_unref (GIOChannel *channel,
gboolean do_close)
{
g_return_if_fail (channel != NULL);
channel->close_on_unref = do_close;
}
/**
* g_io_channel_get_close_on_unref:
* @channel: a #GIOChannel.
*
* Returns whether the file/socket/whatever associated with @channel
* will be closed when @channel receives its final unref and is
* destroyed. The default value of this is %TRUE for channels created
* by g_io_channel_new_file (), and %FALSE for all other channels.
*
* Returns: %TRUE if the channel will be closed, %FALSE otherwise.
**/
gboolean
g_io_channel_get_close_on_unref (GIOChannel *channel)
{
g_return_val_if_fail (channel != NULL, FALSE);
return channel->close_on_unref;
}
/**
* g_io_channel_seek_position:
* @channel: a #GIOChannel
* @offset: The offset in bytes from the position specified by @type
* @type: a #GSeekType. The type %G_SEEK_CUR is only allowed in those
* cases where a call to g_io_channel_set_encoding ()
* is allowed. See the documentation for
* g_io_channel_set_encoding () for details.
* @error: A location to return an error of type #GIOChannelError
*
* Replacement for g_io_channel_seek() with the new API.
*
* Returns: the status of the operation.
**/
/**
* GSeekType:
* @G_SEEK_CUR: the current position in the file.
* @G_SEEK_SET: the start of the file.
* @G_SEEK_END: the end of the file.
*
* An enumeration specifying the base position for a
* g_io_channel_seek_position() operation.
**/
GIOStatus
g_io_channel_seek_position (GIOChannel *channel,
gint64 offset,
GSeekType type,
GError **error)
{
GIOStatus status;
/* For files, only one of the read and write buffers can contain data.
* For sockets, both can contain data.
*/
g_return_val_if_fail (channel != NULL, G_IO_STATUS_ERROR);
g_return_val_if_fail ((error == NULL) || (*error == NULL),
G_IO_STATUS_ERROR);
g_return_val_if_fail (channel->is_seekable, G_IO_STATUS_ERROR);
switch (type)
{
case G_SEEK_CUR: /* The user is seeking relative to the head of the buffer */
if (channel->use_buffer)
{
if (channel->do_encode && channel->encoded_read_buf
&& channel->encoded_read_buf->len > 0)
{
g_warning ("Seek type G_SEEK_CUR not allowed for this"
" channel's encoding.");
return G_IO_STATUS_ERROR;
}
if (channel->read_buf)
offset -= channel->read_buf->len;
if (channel->encoded_read_buf)
{
g_assert (channel->encoded_read_buf->len == 0 || !channel->do_encode);
/* If there's anything here, it's because the encoding is UTF-8,
* so we can just subtract the buffer length, the same as for
* the unencoded data.
*/
offset -= channel->encoded_read_buf->len;
}
}
break;
case G_SEEK_SET:
case G_SEEK_END:
break;
default:
g_warning ("g_io_channel_seek_position: unknown seek type");
return G_IO_STATUS_ERROR;
}
if (channel->use_buffer)
{
status = g_io_channel_flush (channel, error);
if (status != G_IO_STATUS_NORMAL)
return status;
}
status = channel->funcs->io_seek (channel, offset, type, error);
if ((status == G_IO_STATUS_NORMAL) && (channel->use_buffer))
{
if (channel->read_buf)
g_string_truncate (channel->read_buf, 0);
/* Conversion state no longer matches position in file */
if (channel->read_cd != (GIConv) -1)
g_iconv (channel->read_cd, NULL, NULL, NULL, NULL);
if (channel->write_cd != (GIConv) -1)
g_iconv (channel->write_cd, NULL, NULL, NULL, NULL);
if (channel->encoded_read_buf)
{
g_assert (channel->encoded_read_buf->len == 0 || !channel->do_encode);
g_string_truncate (channel->encoded_read_buf, 0);
}
if (channel->partial_write_buf[0] != '\0')
{
g_warning ("Partial character at end of write buffer not flushed.");
channel->partial_write_buf[0] = '\0';
}
}
return status;
}
/**
* g_io_channel_flush:
* @channel: a #GIOChannel
* @error: location to store an error of type #GIOChannelError
*
* Flushes the write buffer for the GIOChannel.
*
* Returns: the status of the operation: One of
* #G_IO_STATUS_NORMAL, #G_IO_STATUS_AGAIN, or
* #G_IO_STATUS_ERROR.
**/
GIOStatus
g_io_channel_flush (GIOChannel *channel,
GError **error)
{
GIOStatus status;
gsize this_time = 1, bytes_written = 0;
g_return_val_if_fail (channel != NULL, G_IO_STATUS_ERROR);
g_return_val_if_fail ((error == NULL) || (*error == NULL), G_IO_STATUS_ERROR);
if (channel->write_buf == NULL || channel->write_buf->len == 0)
return G_IO_STATUS_NORMAL;
do
{
g_assert (this_time > 0);
status = channel->funcs->io_write (channel,
channel->write_buf->str + bytes_written,
channel->write_buf->len - bytes_written,
&this_time, error);
bytes_written += this_time;
}
while ((bytes_written < channel->write_buf->len)
&& (status == G_IO_STATUS_NORMAL));
g_string_erase (channel->write_buf, 0, bytes_written);
return status;
}
/**
* g_io_channel_set_buffered:
* @channel: a #GIOChannel
* @buffered: whether to set the channel buffered or unbuffered
*
* The buffering state can only be set if the channel's encoding
* is %NULL. For any other encoding, the channel must be buffered.
*
* A buffered channel can only be set unbuffered if the channel's
* internal buffers have been flushed. Newly created channels or
* channels which have returned %G_IO_STATUS_EOF
* not require such a flush. For write-only channels, a call to
* g_io_channel_flush () is sufficient. For all other channels,
* the buffers may be flushed by a call to g_io_channel_seek_position ().
* This includes the possibility of seeking with seek type %G_SEEK_CUR
* and an offset of zero. Note that this means that socket-based
* channels cannot be set unbuffered once they have had data
* read from them.
*
* On unbuffered channels, it is safe to mix read and write
* calls from the new and old APIs, if this is necessary for
* maintaining old code.
*
* The default state of the channel is buffered.
**/
void
g_io_channel_set_buffered (GIOChannel *channel,
gboolean buffered)
{
g_return_if_fail (channel != NULL);
if (channel->encoding != NULL)
{
g_warning ("Need to have NULL encoding to set the buffering state of the "
"channel.");
return;
}
g_return_if_fail (!channel->read_buf || channel->read_buf->len == 0);
g_return_if_fail (!channel->write_buf || channel->write_buf->len == 0);
channel->use_buffer = buffered;
}
/**
* g_io_channel_get_buffered:
* @channel: a #GIOChannel
*
* Returns whether @channel is buffered.
*
* Return Value: %TRUE if the @channel is buffered.
**/
gboolean
g_io_channel_get_buffered (GIOChannel *channel)
{
g_return_val_if_fail (channel != NULL, FALSE);
return channel->use_buffer;
}
/**
* g_io_channel_set_encoding:
* @channel: a #GIOChannel
* @encoding: (nullable): the encoding type
* @error: location to store an error of type #GConvertError
*
* Sets the encoding for the input/output of the channel.
* The internal encoding is always UTF-8. The default encoding
* for the external file is UTF-8.
*
* The encoding %NULL is safe to use with binary data.
*
* The encoding can only be set if one of the following conditions
* is true:
*
* - The channel was just created, and has not been written to or read from yet.
*
* - The channel is write-only.
*
* - The channel is a file, and the file pointer was just repositioned
* by a call to g_io_channel_seek_position(). (This flushes all the
* internal buffers.)
*
* - The current encoding is %NULL or UTF-8.
*
* - One of the (new API) read functions has just returned %G_IO_STATUS_EOF
* (or, in the case of g_io_channel_read_to_end(), %G_IO_STATUS_NORMAL).
*
* - One of the functions g_io_channel_read_chars() or
* g_io_channel_read_unichar() has returned %G_IO_STATUS_AGAIN or
* %G_IO_STATUS_ERROR. This may be useful in the case of
* %G_CONVERT_ERROR_ILLEGAL_SEQUENCE.
* Returning one of these statuses from g_io_channel_read_line(),
* g_io_channel_read_line_string(), or g_io_channel_read_to_end()
* does not guarantee that the encoding can be changed.
*
* Channels which do not meet one of the above conditions cannot call
* g_io_channel_seek_position() with an offset of %G_SEEK_CUR, and, if
* they are "seekable", cannot call g_io_channel_write_chars() after
* calling one of the API "read" functions.
*
* Return Value: %G_IO_STATUS_NORMAL if the encoding was successfully set
*/
GIOStatus
g_io_channel_set_encoding (GIOChannel *channel,
const gchar *encoding,
GError **error)
{
GIConv read_cd, write_cd;
gboolean did_encode;
g_return_val_if_fail (channel != NULL, G_IO_STATUS_ERROR);
g_return_val_if_fail ((error == NULL) || (*error == NULL), G_IO_STATUS_ERROR);
/* Make sure the encoded buffers are empty */
g_return_val_if_fail (!channel->do_encode || !channel->encoded_read_buf ||
channel->encoded_read_buf->len == 0, G_IO_STATUS_ERROR);
if (!channel->use_buffer)
{
g_warning ("Need to set the channel buffered before setting the encoding.");
g_warning ("Assuming this is what you meant and acting accordingly.");
channel->use_buffer = TRUE;
}
if (channel->partial_write_buf[0] != '\0')
{
g_warning ("Partial character at end of write buffer not flushed.");
channel->partial_write_buf[0] = '\0';
}
did_encode = channel->do_encode;
if (!encoding || strcmp (encoding, "UTF8") == 0 || strcmp (encoding, "UTF-8") == 0)
{
channel->do_encode = FALSE;
read_cd = write_cd = (GIConv) -1;
}
else
{
gint err = 0;
const gchar *from_enc = NULL, *to_enc = NULL;
if (channel->is_readable)
{
read_cd = g_iconv_open ("UTF-8", encoding);
if (read_cd == (GIConv) -1)
{
err = errno;
from_enc = encoding;
to_enc = "UTF-8";
}
}
else
read_cd = (GIConv) -1;
if (channel->is_writeable && err == 0)
{
write_cd = g_iconv_open (encoding, "UTF-8");
if (write_cd == (GIConv) -1)
{
err = errno;
from_enc = "UTF-8";
to_enc = encoding;
}
}
else
write_cd = (GIConv) -1;
if (err != 0)
{
g_assert (from_enc);
g_assert (to_enc);
if (err == EINVAL)
g_set_error (error, G_CONVERT_ERROR, G_CONVERT_ERROR_NO_CONVERSION,
_("Conversion from character set “%s” to “%s” is not supported"),
from_enc, to_enc);
else
g_set_error (error, G_CONVERT_ERROR, G_CONVERT_ERROR_FAILED,
_("Could not open converter from “%s” to “%s”: %s"),
from_enc, to_enc, g_strerror (err));
if (read_cd != (GIConv) -1)
g_iconv_close (read_cd);
if (write_cd != (GIConv) -1)
g_iconv_close (write_cd);
return G_IO_STATUS_ERROR;
}
channel->do_encode = TRUE;
}
/* The encoding is ok, so set the fields in channel */
if (channel->read_cd != (GIConv) -1)
g_iconv_close (channel->read_cd);
if (channel->write_cd != (GIConv) -1)
g_iconv_close (channel->write_cd);
if (channel->encoded_read_buf && channel->encoded_read_buf->len > 0)
{
g_assert (!did_encode); /* Encoding UTF-8, NULL doesn't use encoded_read_buf */
/* This is just validated UTF-8, so we can copy it back into read_buf
* so it can be encoded in whatever the new encoding is.
*/
g_string_prepend_len (channel->read_buf, channel->encoded_read_buf->str,
channel->encoded_read_buf->len);
g_string_truncate (channel->encoded_read_buf, 0);
}
channel->read_cd = read_cd;
channel->write_cd = write_cd;
g_free (channel->encoding);
channel->encoding = g_strdup (encoding);
return G_IO_STATUS_NORMAL;
}
/**
* g_io_channel_get_encoding:
* @channel: a #GIOChannel
*
* Gets the encoding for the input/output of the channel.
* The internal encoding is always UTF-8. The encoding %NULL
* makes the channel safe for binary data.
*
* Returns: A string containing the encoding, this string is
* owned by GLib and must not be freed.
**/
const gchar *
g_io_channel_get_encoding (GIOChannel *channel)
{
g_return_val_if_fail (channel != NULL, NULL);
return channel->encoding;
}
static GIOStatus
g_io_channel_fill_buffer (GIOChannel *channel,
GError **err)
{
gsize read_size, cur_len, oldlen;
GIOStatus status;
if (channel->is_seekable && channel->write_buf && channel->write_buf->len > 0)
{
status = g_io_channel_flush (channel, err);
if (status != G_IO_STATUS_NORMAL)
return status;
}
if (channel->is_seekable && channel->partial_write_buf[0] != '\0')
{
g_warning ("Partial character at end of write buffer not flushed.");
channel->partial_write_buf[0] = '\0';
}
if (!channel->read_buf)
channel->read_buf = g_string_sized_new (channel->buf_size);
cur_len = channel->read_buf->len;
g_string_set_size (channel->read_buf, channel->read_buf->len + channel->buf_size);
status = channel->funcs->io_read (channel, channel->read_buf->str + cur_len,
channel->buf_size, &read_size, err);
g_assert ((status == G_IO_STATUS_NORMAL) || (read_size == 0));
g_string_truncate (channel->read_buf, read_size + cur_len);
if ((status != G_IO_STATUS_NORMAL) &&
((status != G_IO_STATUS_EOF) || (channel->read_buf->len == 0)))
return status;
g_assert (channel->read_buf->len > 0);
if (channel->encoded_read_buf)
oldlen = channel->encoded_read_buf->len;
else
{
oldlen = 0;
if (channel->encoding)
channel->encoded_read_buf = g_string_sized_new (channel->buf_size);
}
if (channel->do_encode)
{
gsize errnum, inbytes_left, outbytes_left;
gchar *inbuf, *outbuf;
int errval;
g_assert (channel->encoded_read_buf);
reencode:
inbytes_left = channel->read_buf->len;
outbytes_left = MAX (channel->read_buf->len,
channel->encoded_read_buf->allocated_len
- channel->encoded_read_buf->len - 1); /* 1 for NULL */
outbytes_left = MAX (outbytes_left, 6);
inbuf = channel->read_buf->str;
g_string_set_size (channel->encoded_read_buf,
channel->encoded_read_buf->len + outbytes_left);
outbuf = channel->encoded_read_buf->str + channel->encoded_read_buf->len
- outbytes_left;
errnum = g_iconv (channel->read_cd, &inbuf, &inbytes_left,
&outbuf, &outbytes_left);
errval = errno;
g_assert (inbuf + inbytes_left == channel->read_buf->str
+ channel->read_buf->len);
g_assert (outbuf + outbytes_left == channel->encoded_read_buf->str
+ channel->encoded_read_buf->len);
g_string_erase (channel->read_buf, 0,
channel->read_buf->len - inbytes_left);
g_string_truncate (channel->encoded_read_buf,
channel->encoded_read_buf->len - outbytes_left);
if (errnum == (gsize) -1)
{
switch (errval)
{
case EINVAL:
if ((oldlen == channel->encoded_read_buf->len)
&& (status == G_IO_STATUS_EOF))
status = G_IO_STATUS_EOF;
else
status = G_IO_STATUS_NORMAL;
break;
case E2BIG:
/* Buffer size at least 6, wrote at least on character */
g_assert (inbuf != channel->read_buf->str);
goto reencode;
case EILSEQ:
if (oldlen < channel->encoded_read_buf->len)
status = G_IO_STATUS_NORMAL;
else
{
g_set_error_literal (err, G_CONVERT_ERROR,
G_CONVERT_ERROR_ILLEGAL_SEQUENCE,
_("Invalid byte sequence in conversion input"));
return G_IO_STATUS_ERROR;
}
break;
default:
g_assert (errval != EBADF); /* The converter should be open */
g_set_error (err, G_CONVERT_ERROR, G_CONVERT_ERROR_FAILED,
_("Error during conversion: %s"), g_strerror (errval));
return G_IO_STATUS_ERROR;
}
}
g_assert ((status != G_IO_STATUS_NORMAL)
|| (channel->encoded_read_buf->len > 0));
}
else if (channel->encoding) /* UTF-8 */
{
gchar *nextchar, *lastchar;
g_assert (channel->encoded_read_buf);
nextchar = channel->read_buf->str;
lastchar = channel->read_buf->str + channel->read_buf->len;
while (nextchar < lastchar)
{
gunichar val_char;
val_char = g_utf8_get_char_validated (nextchar, lastchar - nextchar);
switch (val_char)
{
case -2:
/* stop, leave partial character in buffer */
lastchar = nextchar;
break;
case -1:
if (oldlen < channel->encoded_read_buf->len)
status = G_IO_STATUS_NORMAL;
else
{
g_set_error_literal (err, G_CONVERT_ERROR,
G_CONVERT_ERROR_ILLEGAL_SEQUENCE,
_("Invalid byte sequence in conversion input"));
status = G_IO_STATUS_ERROR;
}
lastchar = nextchar;
break;
default:
nextchar = g_utf8_next_char (nextchar);
break;
}
}
if (lastchar > channel->read_buf->str)
{
gint copy_len = lastchar - channel->read_buf->str;
g_string_append_len (channel->encoded_read_buf, channel->read_buf->str,
copy_len);
g_string_erase (channel->read_buf, 0, copy_len);
}
}
return status;
}
/**
* g_io_channel_read_line:
* @channel: a #GIOChannel
* @str_return: (out): The line read from the #GIOChannel, including the
* line terminator. This data should be freed with g_free()
* when no longer needed. This is a nul-terminated string.
* If a @length of zero is returned, this will be %NULL instead.
* @length: (out) (optional): location to store length of the read data, or %NULL
* @terminator_pos: (out) (optional): location to store position of line terminator, or %NULL
* @error: A location to return an error of type #GConvertError
* or #GIOChannelError
*
* Reads a line, including the terminating character(s),
* from a #GIOChannel into a newly-allocated string.
* @str_return will contain allocated memory if the return
* is %G_IO_STATUS_NORMAL.
*
* Returns: the status of the operation.
**/
GIOStatus
g_io_channel_read_line (GIOChannel *channel,
gchar **str_return,
gsize *length,
gsize *terminator_pos,
GError **error)
{
GIOStatus status;
gsize got_length;
g_return_val_if_fail (channel != NULL, G_IO_STATUS_ERROR);
g_return_val_if_fail (str_return != NULL, G_IO_STATUS_ERROR);
g_return_val_if_fail ((error == NULL) || (*error == NULL),
G_IO_STATUS_ERROR);
g_return_val_if_fail (channel->is_readable, G_IO_STATUS_ERROR);
status = g_io_channel_read_line_backend (channel, &got_length, terminator_pos, error);
if (length && status != G_IO_STATUS_ERROR)
*length = got_length;
if (status == G_IO_STATUS_NORMAL)
{
g_assert (USE_BUF (channel));
*str_return = g_strndup (USE_BUF (channel)->str, got_length);
g_string_erase (USE_BUF (channel), 0, got_length);
}
else
*str_return = NULL;
return status;
}
/**
* g_io_channel_read_line_string:
* @channel: a #GIOChannel
* @buffer: a #GString into which the line will be written.
* If @buffer already contains data, the old data will
* be overwritten.
* @terminator_pos: (nullable): location to store position of line terminator, or %NULL
* @error: a location to store an error of type #GConvertError
* or #GIOChannelError
*
* Reads a line from a #GIOChannel, using a #GString as a buffer.
*
* Returns: the status of the operation.
**/
GIOStatus
g_io_channel_read_line_string (GIOChannel *channel,
GString *buffer,
gsize *terminator_pos,
GError **error)
{
gsize length;
GIOStatus status;
g_return_val_if_fail (channel != NULL, G_IO_STATUS_ERROR);
g_return_val_if_fail (buffer != NULL, G_IO_STATUS_ERROR);
g_return_val_if_fail ((error == NULL) || (*error == NULL),
G_IO_STATUS_ERROR);
g_return_val_if_fail (channel->is_readable, G_IO_STATUS_ERROR);
if (buffer->len > 0)
g_string_truncate (buffer, 0); /* clear out the buffer */
status = g_io_channel_read_line_backend (channel, &length, terminator_pos, error);
if (status == G_IO_STATUS_NORMAL)
{
g_assert (USE_BUF (channel));
g_string_append_len (buffer, USE_BUF (channel)->str, length);
g_string_erase (USE_BUF (channel), 0, length);
}
return status;
}
static GIOStatus
g_io_channel_read_line_backend (GIOChannel *channel,
gsize *length,
gsize *terminator_pos,
GError **error)
{
GIOStatus status;
gsize checked_to, line_term_len, line_length, got_term_len;
gboolean first_time = TRUE;
if (!channel->use_buffer)
{
/* Can't do a raw read in read_line */
g_set_error_literal (error, G_CONVERT_ERROR, G_CONVERT_ERROR_FAILED,
_("Can’t do a raw read in g_io_channel_read_line_string"));
return G_IO_STATUS_ERROR;
}
status = G_IO_STATUS_NORMAL;
if (channel->line_term)
line_term_len = channel->line_term_len;
else
line_term_len = 3;
/* This value used for setting checked_to, it's the longest of the four
* we autodetect for.
*/
checked_to = 0;
while (TRUE)
{
gchar *nextchar, *lastchar;
GString *use_buf;
if (!first_time || (BUF_LEN (USE_BUF (channel)) == 0))
{
read_again:
status = g_io_channel_fill_buffer (channel, error);
switch (status)
{
case G_IO_STATUS_NORMAL:
if (BUF_LEN (USE_BUF (channel)) == 0)
/* Can happen when using conversion and only read
* part of a character
*/
{
first_time = FALSE;
continue;
}
break;
case G_IO_STATUS_EOF:
if (BUF_LEN (USE_BUF (channel)) == 0)
{
if (length)
*length = 0;
if (channel->encoding && channel->read_buf->len != 0)
{
g_set_error_literal (error, G_CONVERT_ERROR,
G_CONVERT_ERROR_PARTIAL_INPUT,
_("Leftover unconverted data in "
"read buffer"));
return G_IO_STATUS_ERROR;
}
else
return G_IO_STATUS_EOF;
}
break;
default:
if (length)
*length = 0;
return status;
}
}
g_assert (BUF_LEN (USE_BUF (channel)) != 0);
use_buf = USE_BUF (channel); /* The buffer has been created by this point */
first_time = FALSE;
lastchar = use_buf->str + use_buf->len;
for (nextchar = use_buf->str + checked_to; nextchar < lastchar;
channel->encoding ? nextchar = g_utf8_next_char (nextchar) : nextchar++)
{
if (channel->line_term)
{
if (memcmp (channel->line_term, nextchar, line_term_len) == 0)
{
line_length = nextchar - use_buf->str;
got_term_len = line_term_len;
goto done;
}
}
else /* auto detect */
{
switch (*nextchar)
{
case '\n': /* unix */
line_length = nextchar - use_buf->str;
got_term_len = 1;
goto done;
case '\r': /* Warning: do not use with sockets */
line_length = nextchar - use_buf->str;
if ((nextchar == lastchar - 1) && (status != G_IO_STATUS_EOF)
&& (lastchar == use_buf->str + use_buf->len))
goto read_again; /* Try to read more data */
if ((nextchar < lastchar - 1) && (*(nextchar + 1) == '\n')) /* dos */
got_term_len = 2;
else /* mac */
got_term_len = 1;
goto done;
case '\xe2': /* Unicode paragraph separator */
if (strncmp ("\xe2\x80\xa9", nextchar, 3) == 0)
{
line_length = nextchar - use_buf->str;
got_term_len = 3;
goto done;
}
break;
case '\0': /* Embeded null in input */
line_length = nextchar - use_buf->str;
got_term_len = 1;
goto done;
default: /* no match */
break;
}
}
}
/* If encoding != NULL, valid UTF-8, didn't overshoot */
g_assert (nextchar == lastchar);
/* Check for EOF */
if (status == G_IO_STATUS_EOF)
{
if (channel->encoding && channel->read_buf->len > 0)
{
g_set_error_literal (error, G_CONVERT_ERROR, G_CONVERT_ERROR_PARTIAL_INPUT,
_("Channel terminates in a partial character"));
return G_IO_STATUS_ERROR;
}
line_length = use_buf->len;
got_term_len = 0;
break;
}
if (use_buf->len > line_term_len - 1)
checked_to = use_buf->len - (line_term_len - 1);
else
checked_to = 0;
}
done:
if (terminator_pos)
*terminator_pos = line_length;
if (length)
*length = line_length + got_term_len;
return G_IO_STATUS_NORMAL;
}
/**
* g_io_channel_read_to_end:
* @channel: a #GIOChannel
* @str_return: (out) (array length=length) (element-type guint8): Location to
* store a pointer to a string holding the remaining data in the
* #GIOChannel. This data should be freed with g_free() when no
* longer needed. This data is terminated by an extra nul
* character, but there may be other nuls in the intervening data.
* @length: (out): location to store length of the data
* @error: location to return an error of type #GConvertError
* or #GIOChannelError
*
* Reads all the remaining data from the file.
*
* Returns: %G_IO_STATUS_NORMAL on success.
* This function never returns %G_IO_STATUS_EOF.
**/
GIOStatus
g_io_channel_read_to_end (GIOChannel *channel,
gchar **str_return,
gsize *length,
GError **error)
{
GIOStatus status;
g_return_val_if_fail (channel != NULL, G_IO_STATUS_ERROR);
g_return_val_if_fail ((error == NULL) || (*error == NULL),
G_IO_STATUS_ERROR);
g_return_val_if_fail (channel->is_readable, G_IO_STATUS_ERROR);
if (str_return)
*str_return = NULL;
if (length)
*length = 0;
if (!channel->use_buffer)
{
g_set_error_literal (error, G_CONVERT_ERROR, G_CONVERT_ERROR_FAILED,
_("Can’t do a raw read in g_io_channel_read_to_end"));
return G_IO_STATUS_ERROR;
}
do
status = g_io_channel_fill_buffer (channel, error);
while (status == G_IO_STATUS_NORMAL);
if (status != G_IO_STATUS_EOF)
return status;
if (channel->encoding && channel->read_buf->len > 0)
{
g_set_error_literal (error, G_CONVERT_ERROR, G_CONVERT_ERROR_PARTIAL_INPUT,
_("Channel terminates in a partial character"));
return G_IO_STATUS_ERROR;
}
if (USE_BUF (channel) == NULL)
{
/* length is already set to zero */
if (str_return)
*str_return = g_strdup ("");
}
else
{
if (length)
*length = USE_BUF (channel)->len;
if (str_return)
*str_return = g_string_free (USE_BUF (channel), FALSE);
else
g_string_free (USE_BUF (channel), TRUE);
if (channel->encoding)
channel->encoded_read_buf = NULL;
else
channel->read_buf = NULL;
}
return G_IO_STATUS_NORMAL;
}
/**
* g_io_channel_read_chars:
* @channel: a #GIOChannel
* @buf: (out caller-allocates) (array length=count) (element-type guint8):
* a buffer to read data into
* @count: (in): the size of the buffer. Note that the buffer may not be
* complelely filled even if there is data in the buffer if the
* remaining data is not a complete character.
* @bytes_read: (out) (optional): The number of bytes read. This may be
* zero even on success if count < 6 and the channel's encoding
* is non-%NULL. This indicates that the next UTF-8 character is
* too wide for the buffer.
* @error: a location to return an error of type #GConvertError
* or #GIOChannelError.
*
* Replacement for g_io_channel_read() with the new API.
*
* Returns: the status of the operation.
*/
GIOStatus
g_io_channel_read_chars (GIOChannel *channel,
gchar *buf,
gsize count,
gsize *bytes_read,
GError **error)
{
GIOStatus status;
gsize got_bytes;
g_return_val_if_fail (channel != NULL, G_IO_STATUS_ERROR);
g_return_val_if_fail ((error == NULL) || (*error == NULL), G_IO_STATUS_ERROR);
g_return_val_if_fail (channel->is_readable, G_IO_STATUS_ERROR);
if (count == 0)
{
if (bytes_read)
*bytes_read = 0;
return G_IO_STATUS_NORMAL;
}
g_return_val_if_fail (buf != NULL, G_IO_STATUS_ERROR);
if (!channel->use_buffer)
{
gsize tmp_bytes;
g_assert (!channel->read_buf || channel->read_buf->len == 0);
status = channel->funcs->io_read (channel, buf, count, &tmp_bytes, error);
if (bytes_read)
*bytes_read = tmp_bytes;
return status;
}
status = G_IO_STATUS_NORMAL;
while (BUF_LEN (USE_BUF (channel)) < count && status == G_IO_STATUS_NORMAL)
status = g_io_channel_fill_buffer (channel, error);
/* Only return an error if we have no data */
if (BUF_LEN (USE_BUF (channel)) == 0)
{
g_assert (status != G_IO_STATUS_NORMAL);
if (status == G_IO_STATUS_EOF && channel->encoding
&& BUF_LEN (channel->read_buf) > 0)
{
g_set_error_literal (error, G_CONVERT_ERROR,
G_CONVERT_ERROR_PARTIAL_INPUT,
_("Leftover unconverted data in read buffer"));
status = G_IO_STATUS_ERROR;
}
if (bytes_read)
*bytes_read = 0;
return status;
}
if (status == G_IO_STATUS_ERROR)
g_clear_error (error);
got_bytes = MIN (count, BUF_LEN (USE_BUF (channel)));
g_assert (got_bytes > 0);
if (channel->encoding)
/* Don't validate for NULL encoding, binary safe */
{
gchar *nextchar, *prevchar;
g_assert (USE_BUF (channel) == channel->encoded_read_buf);
nextchar = channel->encoded_read_buf->str;
do
{
prevchar = nextchar;
nextchar = g_utf8_next_char (nextchar);
g_assert (nextchar != prevchar); /* Possible for *prevchar of -1 or -2 */
}
while (nextchar < channel->encoded_read_buf->str + got_bytes);
if (nextchar > channel->encoded_read_buf->str + got_bytes)
got_bytes = prevchar - channel->encoded_read_buf->str;
g_assert (got_bytes > 0 || count < 6);
}
memcpy (buf, USE_BUF (channel)->str, got_bytes);
g_string_erase (USE_BUF (channel), 0, got_bytes);
if (bytes_read)
*bytes_read = got_bytes;
return G_IO_STATUS_NORMAL;
}
/**
* g_io_channel_read_unichar:
* @channel: a #GIOChannel
* @thechar: (out): a location to return a character
* @error: a location to return an error of type #GConvertError
* or #GIOChannelError
*
* Reads a Unicode character from @channel.
* This function cannot be called on a channel with %NULL encoding.
*
* Returns: a #GIOStatus
**/
GIOStatus
g_io_channel_read_unichar (GIOChannel *channel,
gunichar *thechar,
GError **error)
{
GIOStatus status = G_IO_STATUS_NORMAL;
g_return_val_if_fail (channel != NULL, G_IO_STATUS_ERROR);
g_return_val_if_fail (channel->encoding != NULL, G_IO_STATUS_ERROR);
g_return_val_if_fail ((error == NULL) || (*error == NULL),
G_IO_STATUS_ERROR);
g_return_val_if_fail (channel->is_readable, G_IO_STATUS_ERROR);
while (BUF_LEN (channel->encoded_read_buf) == 0 && status == G_IO_STATUS_NORMAL)
status = g_io_channel_fill_buffer (channel, error);
/* Only return an error if we have no data */
if (BUF_LEN (USE_BUF (channel)) == 0)
{
g_assert (status != G_IO_STATUS_NORMAL);
if (status == G_IO_STATUS_EOF && BUF_LEN (channel->read_buf) > 0)
{
g_set_error_literal (error, G_CONVERT_ERROR,
G_CONVERT_ERROR_PARTIAL_INPUT,
_("Leftover unconverted data in read buffer"));
status = G_IO_STATUS_ERROR;
}
if (thechar)
*thechar = (gunichar) -1;
return status;
}
if (status == G_IO_STATUS_ERROR)
g_clear_error (error);
if (thechar)
*thechar = g_utf8_get_char (channel->encoded_read_buf->str);
g_string_erase (channel->encoded_read_buf, 0,
g_utf8_next_char (channel->encoded_read_buf->str)
- channel->encoded_read_buf->str);
return G_IO_STATUS_NORMAL;
}
/**
* g_io_channel_write_chars:
* @channel: a #GIOChannel
* @buf: (array) (element-type guint8): a buffer to write data from
* @count: the size of the buffer. If -1, the buffer
* is taken to be a nul-terminated string.
* @bytes_written: (out): The number of bytes written. This can be nonzero
* even if the return value is not %G_IO_STATUS_NORMAL.
* If the return value is %G_IO_STATUS_NORMAL and the
* channel is blocking, this will always be equal
* to @count if @count >= 0.
* @error: a location to return an error of type #GConvertError
* or #GIOChannelError
*
* Replacement for g_io_channel_write() with the new API.
*
* On seekable channels with encodings other than %NULL or UTF-8, generic
* mixing of reading and writing is not allowed. A call to g_io_channel_write_chars ()
* may only be made on a channel from which data has been read in the
* cases described in the documentation for g_io_channel_set_encoding ().
*
* Returns: the status of the operation.
**/
GIOStatus
g_io_channel_write_chars (GIOChannel *channel,
const gchar *buf,
gssize count,
gsize *bytes_written,
GError **error)
{
GIOStatus status;
gssize wrote_bytes = 0;
g_return_val_if_fail (channel != NULL, G_IO_STATUS_ERROR);
g_return_val_if_fail ((error == NULL) || (*error == NULL),
G_IO_STATUS_ERROR);
g_return_val_if_fail (channel->is_writeable, G_IO_STATUS_ERROR);
if ((count < 0) && buf)
count = strlen (buf);
if (count == 0)
{
if (bytes_written)
*bytes_written = 0;
return G_IO_STATUS_NORMAL;
}
g_return_val_if_fail (buf != NULL, G_IO_STATUS_ERROR);
g_return_val_if_fail (count > 0, G_IO_STATUS_ERROR);
/* Raw write case */
if (!channel->use_buffer)
{
gsize tmp_bytes;
g_assert (!channel->write_buf || channel->write_buf->len == 0);
g_assert (channel->partial_write_buf[0] == '\0');
status = channel->funcs->io_write (channel, buf, count, &tmp_bytes, error);
if (bytes_written)
*bytes_written = tmp_bytes;
return status;
}
/* General case */
if (channel->is_seekable && (( BUF_LEN (channel->read_buf) > 0)
|| (BUF_LEN (channel->encoded_read_buf) > 0)))
{
if (channel->do_encode && BUF_LEN (channel->encoded_read_buf) > 0)
{
g_warning ("Mixed reading and writing not allowed on encoded files");
return G_IO_STATUS_ERROR;
}
status = g_io_channel_seek_position (channel, 0, G_SEEK_CUR, error);
if (status != G_IO_STATUS_NORMAL)
{
if (bytes_written)
*bytes_written = 0;
return status;
}
}
if (!channel->write_buf)
channel->write_buf = g_string_sized_new (channel->buf_size);
while (wrote_bytes < count)
{
gsize space_in_buf;
/* If the buffer is full, try a write immediately. In
* the nonblocking case, this prevents the user from
* writing just a little bit to the buffer every time
* and never receiving an EAGAIN.
*/
if (channel->write_buf->len >= channel->buf_size - MAX_CHAR_SIZE)
{
gsize did_write = 0, this_time;
do
{
status = channel->funcs->io_write (channel, channel->write_buf->str
+ did_write, channel->write_buf->len
- did_write, &this_time, error);
did_write += this_time;
}
while (status == G_IO_STATUS_NORMAL &&
did_write < MIN (channel->write_buf->len, MAX_CHAR_SIZE));
g_string_erase (channel->write_buf, 0, did_write);
if (status != G_IO_STATUS_NORMAL)
{
if (status == G_IO_STATUS_AGAIN && wrote_bytes > 0)
status = G_IO_STATUS_NORMAL;
if (bytes_written)
*bytes_written = wrote_bytes;
return status;
}
}
space_in_buf = MAX (channel->buf_size, channel->write_buf->allocated_len - 1)
- channel->write_buf->len; /* 1 for NULL */
/* This is only true because g_io_channel_set_buffer_size ()
* ensures that channel->buf_size >= MAX_CHAR_SIZE.
*/
g_assert (space_in_buf >= MAX_CHAR_SIZE);
if (!channel->encoding)
{
gssize write_this = MIN (space_in_buf, count - wrote_bytes);
g_string_append_len (channel->write_buf, buf, write_this);
buf += write_this;
wrote_bytes += write_this;
}
else
{
const gchar *from_buf;
gsize from_buf_len, from_buf_old_len, left_len;
gsize err;
gint errnum;
if (channel->partial_write_buf[0] != '\0')
{
g_assert (wrote_bytes == 0);
from_buf = channel->partial_write_buf;
from_buf_old_len = strlen (channel->partial_write_buf);
g_assert (from_buf_old_len > 0);
from_buf_len = MIN (6, from_buf_old_len + count);
memcpy (channel->partial_write_buf + from_buf_old_len, buf,
from_buf_len - from_buf_old_len);
}
else
{
from_buf = buf;
from_buf_len = count - wrote_bytes;
from_buf_old_len = 0;
}
reconvert:
if (!channel->do_encode) /* UTF-8 encoding */
{
const gchar *badchar;
gsize try_len = MIN (from_buf_len, space_in_buf);
/* UTF-8, just validate, emulate g_iconv */
if (!g_utf8_validate (from_buf, try_len, &badchar))
{
gunichar try_char;
gsize incomplete_len = from_buf + try_len - badchar;
left_len = from_buf + from_buf_len - badchar;
try_char = g_utf8_get_char_validated (badchar, incomplete_len);
switch (try_char)
{
case -2:
g_assert (incomplete_len < 6);
if (try_len == from_buf_len)
{
errnum = EINVAL;
err = (gsize) -1;
}
else
{
errnum = 0;
err = (gsize) 0;
}
break;
case -1:
g_warning ("Invalid UTF-8 passed to g_io_channel_write_chars().");
/* FIXME bail here? */
errnum = EILSEQ;
err = (gsize) -1;
break;
default:
g_assert_not_reached ();
err = (gsize) -1;
errnum = 0; /* Don't confunse the compiler */
}
}
else
{
err = (gsize) 0;
errnum = 0;
left_len = from_buf_len - try_len;
}
g_string_append_len (channel->write_buf, from_buf,
from_buf_len - left_len);
from_buf += from_buf_len - left_len;
}
else
{
gchar *outbuf;
left_len = from_buf_len;
g_string_set_size (channel->write_buf, channel->write_buf->len
+ space_in_buf);
outbuf = channel->write_buf->str + channel->write_buf->len
- space_in_buf;
err = g_iconv (channel->write_cd, (gchar **) &from_buf, &left_len,
&outbuf, &space_in_buf);
errnum = errno;
g_string_truncate (channel->write_buf, channel->write_buf->len
- space_in_buf);
}
if (err == (gsize) -1)
{
switch (errnum)
{
case EINVAL:
g_assert (left_len < 6);
if (from_buf_old_len == 0)
{
/* Not from partial_write_buf */
memcpy (channel->partial_write_buf, from_buf, left_len);
channel->partial_write_buf[left_len] = '\0';
if (bytes_written)
*bytes_written = count;
return G_IO_STATUS_NORMAL;
}
/* Working in partial_write_buf */
if (left_len == from_buf_len)
{
/* Didn't convert anything, must still have
* less than a full character
*/
g_assert (count == from_buf_len - from_buf_old_len);
channel->partial_write_buf[from_buf_len] = '\0';
if (bytes_written)
*bytes_written = count;
return G_IO_STATUS_NORMAL;
}
g_assert (from_buf_len - left_len >= from_buf_old_len);
/* We converted all the old data. This is fine */
break;
case E2BIG:
if (from_buf_len == left_len)
{
/* Nothing was written, add enough space for
* at least one character.
*/
space_in_buf += MAX_CHAR_SIZE;
goto reconvert;
}
break;
case EILSEQ:
g_set_error_literal (error, G_CONVERT_ERROR,
G_CONVERT_ERROR_ILLEGAL_SEQUENCE,
_("Invalid byte sequence in conversion input"));
if (from_buf_old_len > 0 && from_buf_len == left_len)
g_warning ("Illegal sequence due to partial character "
"at the end of a previous write.");
else
wrote_bytes += from_buf_len - left_len - from_buf_old_len;
if (bytes_written)
*bytes_written = wrote_bytes;
channel->partial_write_buf[0] = '\0';
return G_IO_STATUS_ERROR;
default:
g_set_error (error, G_CONVERT_ERROR, G_CONVERT_ERROR_FAILED,
_("Error during conversion: %s"), g_strerror (errnum));
if (from_buf_len >= left_len + from_buf_old_len)
wrote_bytes += from_buf_len - left_len - from_buf_old_len;
if (bytes_written)
*bytes_written = wrote_bytes;
channel->partial_write_buf[0] = '\0';
return G_IO_STATUS_ERROR;
}
}
g_assert (from_buf_len - left_len >= from_buf_old_len);
wrote_bytes += from_buf_len - left_len - from_buf_old_len;
if (from_buf_old_len > 0)
{
/* We were working in partial_write_buf */
buf += from_buf_len - left_len - from_buf_old_len;
channel->partial_write_buf[0] = '\0';
}
else
buf = from_buf;
}
}
if (bytes_written)
*bytes_written = count;
return G_IO_STATUS_NORMAL;
}
/**
* g_io_channel_write_unichar:
* @channel: a #GIOChannel
* @thechar: a character
* @error: location to return an error of type #GConvertError
* or #GIOChannelError
*
* Writes a Unicode character to @channel.
* This function cannot be called on a channel with %NULL encoding.
*
* Returns: a #GIOStatus
**/
GIOStatus
g_io_channel_write_unichar (GIOChannel *channel,
gunichar thechar,
GError **error)
{
GIOStatus status;
gchar static_buf[6];
gsize char_len, wrote_len;
g_return_val_if_fail (channel != NULL, G_IO_STATUS_ERROR);
g_return_val_if_fail (channel->encoding != NULL, G_IO_STATUS_ERROR);
g_return_val_if_fail ((error == NULL) || (*error == NULL),
G_IO_STATUS_ERROR);
g_return_val_if_fail (channel->is_writeable, G_IO_STATUS_ERROR);
char_len = g_unichar_to_utf8 (thechar, static_buf);
if (channel->partial_write_buf[0] != '\0')
{
g_warning ("Partial character written before writing unichar.");
channel->partial_write_buf[0] = '\0';
}
status = g_io_channel_write_chars (channel, static_buf,
char_len, &wrote_len, error);
/* We validate UTF-8, so we can't get a partial write */
g_assert (wrote_len == char_len || status != G_IO_STATUS_NORMAL);
return status;
}
/**
* G_IO_CHANNEL_ERROR:
*
* Error domain for #GIOChannel operations. Errors in this domain will
* be from the #GIOChannelError enumeration. See #GError for
* information on error domains.
**/
/**
* GIOChannelError:
* @G_IO_CHANNEL_ERROR_FBIG: File too large.
* @G_IO_CHANNEL_ERROR_INVAL: Invalid argument.
* @G_IO_CHANNEL_ERROR_IO: IO error.
* @G_IO_CHANNEL_ERROR_ISDIR: File is a directory.
* @G_IO_CHANNEL_ERROR_NOSPC: No space left on device.
* @G_IO_CHANNEL_ERROR_NXIO: No such device or address.
* @G_IO_CHANNEL_ERROR_OVERFLOW: Value too large for defined datatype.
* @G_IO_CHANNEL_ERROR_PIPE: Broken pipe.
* @G_IO_CHANNEL_ERROR_FAILED: Some other error.
*
* Error codes returned by #GIOChannel operations.
**/
G_DEFINE_QUARK (g-io-channel-error-quark, g_io_channel_error)