Use exceptions.

src/XMPPExceptions.h

@@ -0,0 +1,56 @@
+/*
+ * Copyright (c) 2011, Jonathan Schleifer <js@webkeks.org>
+ *
+ * https://webkeks.org/hg/objxmpp/
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice is present in all copies.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#import <ObjFW/ObjFW.h>
+
+@class XMPPConnection;
+
+@interface XMPPException: OFException
+{
+	XMPPConnection *connection;
+}
+
+@property (readonly, nonatomic) XMPPConnection *connection;
+
++ newWithClass: (Class)class_
+    connection: (XMPPConnection*)conn;
+- initWithClass: (Class)class_
+     connection: (XMPPConnection*)conn;
+@end
+
+@interface XMPPStringPrepFailedException: XMPPException
+{
+	OFString *profile;
+	OFString *string;
+}
+
+@property (readonly, nonatomic) OFString *profile, *string;
+
++ newWithClass: (Class)class_
+    connection: (XMPPConnection*)conn
+       profile: (OFString*)profile
+	string: (OFString*)string;
+- initWithClass: (Class)class_
+     connection: (XMPPConnection*)conn
+	profile: (OFString*)profile
+	 string: (OFString*)string;
+@end