ObjFW  Artifact [545888cf6f]

Artifact 545888cf6fed1a117b1e0b61c9bcafbf0f8d7f38eb677edf81b1d7f4f717bec0:

• File src/exceptions/OFReadOrWriteFailedException.m — part of check-in [62e2de30b9] at 2015-02-16 08:39:17 on branch trunk — Explicitly pass errno to exceptions

  The old behaviour where the exception would access errno directly on
  creation of the exception was very fragile. The two main problems with
  it were that sometimes it would pick up an errno even though none had
  been set and in other cases that when the exception was created errno
  had already been overridden.

  This also greatly increases errno handling on Win32, especially in
  conjunction with sockets. It can still be improved further, though. (user: js, size: 2200) [annotate] [blame] [check-ins using]

/*
 * Copyright (c) 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015
 *   Jonathan Schleifer <js@webkeks.org>
 *
 * All rights reserved.
 *
 * This file is part of ObjFW. It may be distributed under the terms of the
 * Q Public License 1.0, which can be found in the file LICENSE.QPL included in
 * the packaging of this file.
 *
 * Alternatively, it may be distributed under the terms of the GNU General
 * Public License, either version 2 or 3, which can be found in the file
 * LICENSE.GPLv2 or LICENSE.GPLv3 respectively included in the packaging of this
 * file.
 */

#include "config.h"

#import "OFReadOrWriteFailedException.h"
#import "OFString.h"

@implementation OFReadOrWriteFailedException
+ (instancetype)exceptionWithObject: (id)object
		    requestedLength: (size_t)requestedLength
{
	return [[[self alloc] initWithObject: object
			     requestedLength: requestedLength] autorelease];
}

+ (instancetype)exceptionWithObject: (id)object
		    requestedLength: (size_t)requestedLength
			      errNo: (int)errNo
{
	return [[[self alloc] initWithObject: object
			     requestedLength: requestedLength
				       errNo: errNo] autorelease];
}

- init
{
	OF_INVALID_INIT_METHOD
}

-  initWithObject: (id)object
  requestedLength: (size_t)requestedLength
{
	self = [super init];

	_object = [object retain];
	_requestedLength = requestedLength;

	return self;
}

-  initWithObject: (id)object
  requestedLength: (size_t)requestedLength
	    errNo: (int)errNo
{
	self = [super init];

	_object = [object retain];
	_requestedLength = requestedLength;
	_errNo = errNo;

	return self;
}

- (void)dealloc
{
	[_object release];

	[super dealloc];
}

- (OFString*)description
{
	if (_errNo != 0)
		return [OFString stringWithFormat:
		    @"Failed to read or write %zu bytes from / to an object of "
		    @"type %@: %@",
		    _requestedLength, [_object class], of_strerror(_errNo)];
	else
		return [OFString stringWithFormat:
		    @"Failed to read or write %zu bytes from / to an object of "
		    @"type %@!",
		    _requestedLength, [_object class]];
}

- (id)object
{
	OF_GETTER(_object, true)
}

- (size_t)requestedLength
{
	return _requestedLength;
}

- (int)errNo
{
	return _errNo;
}
@end