From e52a09c5078364f0a645f407c797e68a2c1d5f04 Mon Sep 17 00:00:00 2001
From: Thomas Graf <tgraf@suug.ch>
Date: Mon, 22 Nov 2010 13:13:04 +0100
Subject: nl: rename nlmsg_msg_size() to nlmsg_size(), nlmsg_len() ->
 nlmsg_datalen()

The old symbols are left around for compatibility.
---
 include/netlink/msg.h | 16 +++++++-------
 lib/attr.c            |  2 +-
 lib/msg.c             | 58 +++++++++++++++++++++++++++++++++++++++------------
 lib/nl.c              |  2 +-
 4 files changed, 54 insertions(+), 24 deletions(-)

diff --git a/include/netlink/msg.h b/include/netlink/msg.h
index e331f42..12b2061 100644
--- a/include/netlink/msg.h
+++ b/include/netlink/msg.h
@@ -44,15 +44,13 @@ struct nl_msg;
 struct nl_tree;
 struct ucred;
 
-/* size calculations */
-extern int		  nlmsg_msg_size(int);
-extern int		  nlmsg_total_size(int);
-extern int		  nlmsg_padlen(int);
-
-/* payload access */
-extern void *		  nlmsg_data(const struct nlmsghdr *);
-extern int		  nlmsg_len(const struct nlmsghdr *);
-extern void *		  nlmsg_tail(const struct nlmsghdr *);
+extern int			nlmsg_size(int);
+extern int			nlmsg_total_size(int);
+extern int			nlmsg_padlen(int);
+
+extern void *			nlmsg_data(const struct nlmsghdr *);
+extern int			nlmsg_datalen(const struct nlmsghdr *);
+extern void *			nlmsg_tail(const struct nlmsghdr *);
 
 /* attribute access */
 extern struct nlattr *	  nlmsg_attrdata(const struct nlmsghdr *, int);
diff --git a/lib/attr.c b/lib/attr.c
index 6147ff3..cccd50d 100644
--- a/lib/attr.c
+++ b/lib/attr.c
@@ -1115,7 +1115,7 @@ int nla_put_nested(struct nl_msg *msg, int attrtype, struct nl_msg *nested)
 	NL_DBG(2, "msg %p: attr <> %d: adding msg %p as nested attribute\n",
 		msg, attrtype, nested);
 
-	return nla_put(msg, attrtype, nlmsg_len(nested->nm_nlh),
+	return nla_put(msg, attrtype, nlmsg_datalen(nested->nm_nlh),
 		       nlmsg_data(nested->nm_nlh));
 }
 
diff --git a/lib/msg.c b/lib/msg.c
index f6d1ee4..95ad188 100644
--- a/lib/msg.c
+++ b/lib/msg.c
@@ -178,17 +178,32 @@ static void __init init_msg_size(void)
  */
 
 /**
- * length of netlink message not including padding
- * @arg payload		length of message payload
+ * Calculates size of netlink message based on payload length.
+ * @arg payload		Length of payload
+ *
+ * See \ref core_msg_fmt_align for more information on alignment.
+ *
+ * @return size of netlink message without padding.
  */
-int nlmsg_msg_size(int payload)
+int nlmsg_size(int payload)
 {
 	return NLMSG_HDRLEN + payload;
 }
 
+int nlmsg_msg_size(int payload)
+{
+	return nlmsg_size(payload);
+}
+
 /**
- * length of netlink message including padding
- * @arg payload		length of message payload
+ * Calculates size of netlink message including padding based on payload length
+ * @arg payload		Length of payload
+ *
+ * This function is idential to nlmsg_size() + nlmsg_padlen().
+ *
+ * See \ref core_msg_fmt_align for more information on alignment.
+ *
+ * @return Size of netlink message including padding.
  */
 int nlmsg_total_size(int payload)
 {
@@ -196,8 +211,16 @@ int nlmsg_total_size(int payload)
 }
 
 /**
- * length of padding at the message's tail
- * @arg payload		length of message payload
+ * Size of padding that needs to be added at end of message
+ * @arg payload		Length of payload
+ *
+ * Calculates the number of bytes of padding which is required to be added to
+ * the end of the message to ensure that the next netlink message header begins
+ * properly aligned to NLMSG_ALIGNTO.
+ *
+ * See \ref core_msg_fmt_align for more information on alignment.
+ *
+ * @return Number of bytes of padding needed.
  */
 int nlmsg_padlen(int payload)
 {
@@ -207,13 +230,15 @@ int nlmsg_padlen(int payload)
 /** @} */
 
 /**
- * @name Payload Access
+ * @name Access to Message Payload
  * @{
  */
 
 /**
- * head of message payload
- * @arg nlh		netlink messsage header
+ * Return pointer to message payload
+ * @arg nlh		Netlink message header
+ *
+ * @return Pointer to start of message payload.
  */
 void *nlmsg_data(const struct nlmsghdr *nlh)
 {
@@ -226,14 +251,21 @@ void *nlmsg_tail(const struct nlmsghdr *nlh)
 }
 
 /**
- * length of message payload
- * @arg nlh		netlink message header
+ * Return length of message payload
+ * @arg nlh		Netlink message header
+ *
+ * @return Length of message payload in bytes.
  */
-int nlmsg_len(const struct nlmsghdr *nlh)
+int nlmsg_datalen(const struct nlmsghdr *nlh)
 {
 	return nlh->nlmsg_len - NLMSG_HDRLEN;
 }
 
+int nlmsg_len(const struct nlmsghdr *nlh)
+{
+	return nlmsg_datalen(nlh);
+}
+
 /** @} */
 
 /**
diff --git a/lib/nl.c b/lib/nl.c
index 4e09b9e..97a5df0 100644
--- a/lib/nl.c
+++ b/lib/nl.c
@@ -637,7 +637,7 @@ continue_reading:
 		else if (hdr->nlmsg_type == NLMSG_ERROR) {
 			struct nlmsgerr *e = nlmsg_data(hdr);
 
-			if (hdr->nlmsg_len < nlmsg_msg_size(sizeof(*e))) {
+			if (hdr->nlmsg_len < nlmsg_size(sizeof(*e))) {
 				/* Truncated error message, the default action
 				 * is to stop parsing. The user may overrule
 				 * this action by returning NL_SKIP or
-- 
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