[socket] Add concept of a generalised socket address converter

Add sock_aton() and sock_ntoa() to allow for parsing and transcription
of arbitrary socket addresses.

Signed-off-by: Michael Brown <mcb30@ipxe.org>

src/net/socket.c

@@ -0,0 +1,65 @@
+/*
+ * Copyright (C) 2013 Michael Brown <mbrown@fensystems.co.uk>.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or any later version.
+ *
+ * This program 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
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ */
+
+FILE_LICENCE ( GPL2_OR_LATER );
+
+#include <stddef.h>
+#include <errno.h>
+#include <ipxe/socket.h>
+
+/** @file
+ *
+ * Sockets
+ *
+ */
+
+/**
+ * Transcribe socket address
+ *
+ * @v sa		Socket address
+ * @ret string		Socket address string
+ */
+const char * sock_ntoa ( struct sockaddr *sa ) {
+	struct sockaddr_converter *converter;
+
+	for_each_table_entry ( converter, SOCKADDR_CONVERTERS ) {
+		if ( converter->family == sa->sa_family )
+			return converter->ntoa ( sa );
+	}
+	return NULL;
+}
+
+/**
+ * Parse socket address
+ *
+ * @v string		Socket address string
+ * @v sa		Socket address to fill in
+ * @ret rc		Return status code
+ */
+int sock_aton ( const char *string, struct sockaddr *sa ) {
+	struct sockaddr_converter *converter;
+
+	for_each_table_entry ( converter, SOCKADDR_CONVERTERS ) {
+		if ( converter->aton ( string, sa ) == 0 ) {
+			sa->sa_family = converter->family;
+			return 0;
+		}
+	}
+	return -EINVAL;
+}