diff mbox series

[2/2] alfred: Simplify calculation of fixed size IPC TLV length

Message ID 20220104091103.162365-2-sven@narfation.org (mailing list archive)
State Accepted, archived
Delegated to: Simon Wunderlich
Headers
Series [1/2] alfred: Avoid large send buffer for fixed size IPC commands |

Commit Message

Sven Eckelmann Jan. 4, 2022, 9:11 a.m. UTC 
  Instead of copying the same code to calculate the length of fixed size
TLVs, just use a common macro.

Signed-off-by: Sven Eckelmann <sven@narfation.org>
---
 alfred.h | 3 +++
 client.c | 9 ++++-----
 2 files changed, 7 insertions(+), 5 deletions(-)

Comments

Marek Lindner Jan. 12, 2022, 4:11 p.m. UTC | #1 
On Tuesday, 4 January 2022 10:11:03 CET Sven Eckelmann wrote:
> Instead of copying the same code to calculate the length of fixed size
> TLVs, just use a common macro.
> 
> Signed-off-by: Sven Eckelmann <sven@narfation.org>

Acked-by: Marek Lindner <mareklindner@neomailbox.ch>

Cheers,
Marek
diff mbox series

Patch

diff --git a/alfred.h b/alfred.h
index 26eb157..0e4dd26 100644
--- a/alfred.h
+++ b/alfred.h
@@ -30,6 +30,9 @@ 
 #define ALFRED_SOCK_PATH_DEFAULT	"/var/run/alfred.sock"
 #define NO_FILTER			-1
 
+#define FIXED_TLV_LEN(__tlv_type) \
+	htons(sizeof(__tlv_type) - sizeof(__tlv_type.header))
+
 enum data_source {
 	SOURCE_LOCAL = 0,
 	SOURCE_FIRST_HAND = 1,
diff --git a/client.c b/client.c
index b5faf3b..d0d19fb 100644
--- a/client.c
+++ b/client.c
@@ -38,8 +38,7 @@  int alfred_client_request_data(struct globals *globals)
 
 	request.header.type = ALFRED_REQUEST;
 	request.header.version = ALFRED_VERSION;
-	request.header.length = sizeof(request) - sizeof(request.header);
-	request.header.length = htons(request.header.length);
+	request.header.length = FIXED_TLV_LEN(request);
 	request.requested_type = globals->clientmode_arg;
 	request.tx_id = get_random_id();
 
@@ -188,7 +187,7 @@  int alfred_client_modeswitch(struct globals *globals)
 
 	modeswitch.header.type = ALFRED_MODESWITCH;
 	modeswitch.header.version = ALFRED_VERSION;
-	modeswitch.header.length = htons(len - sizeof(modeswitch.header));
+	modeswitch.header.length = FIXED_TLV_LEN(modeswitch);
 
 	switch (globals->opmode) {
 	case OPMODE_SECONDARY:
@@ -264,7 +263,7 @@  int alfred_client_change_interface(struct globals *globals)
 
 	change_interface.header.type = ALFRED_CHANGE_INTERFACE;
 	change_interface.header.version = ALFRED_VERSION;
-	change_interface.header.length = htons(len - sizeof(change_interface.header));
+	change_interface.header.length = FIXED_TLV_LEN(change_interface);
 	strncpy(change_interface.ifaces, globals->change_interface,
 		sizeof(change_interface.ifaces));
 	change_interface.ifaces[sizeof(change_interface.ifaces) - 1] = '\0';
@@ -312,7 +311,7 @@  int alfred_client_change_bat_iface(struct globals *globals)
 
 	change_bat_iface.header.type = ALFRED_CHANGE_BAT_IFACE;
 	change_bat_iface.header.version = ALFRED_VERSION;
-	change_bat_iface.header.length = htons(len - sizeof(change_bat_iface.header));
+	change_bat_iface.header.length = FIXED_TLV_LEN(change_bat_iface);
 	strncpy(change_bat_iface.bat_iface, globals->mesh_iface,
 		sizeof(change_bat_iface.bat_iface));
 	change_bat_iface.bat_iface[sizeof(change_bat_iface.bat_iface) - 1] = '\0';