api: add macro that zeros out api reply buffer

Add macros REPLY_MACRO2_ZERO, REPLY_MACRO3_ZERO that zeros the buffer
before the values are set. This way if say, a u8[64] field is
only filled with 10 octets, the previous buffers trailing
contents are not sent.

Type: feature

Change-Id: Ia69cc9aa477f463336483f7556de32476a6f2d51
Signed-off-by: Paul Vinciguerra <pvinci@vinciconsulting.com>

diff --git a/src/vlibapi/api_helper_macros.h b/src/vlibapi/api_helper_macros.h
index b4e69b4..b19d4f9 100644 (file)
--- a/src/vlibapi/api_helper_macros.h
+++ b/src/vlibapi/api_helper_macros.h
@@ -59,6 +59,22 @@ do {                                                                    \
     vl_api_send_msg (rp, (u8 *)rmp);                                    \
 } while(0);
 
+#define REPLY_MACRO2_ZERO(t, body)                                      \
+do {                                                                    \
+    vl_api_registration_t *rp;                                          \
+    rv = vl_msg_api_pd_handler (mp, rv);                                \
+    rp = vl_api_client_index_to_registration (mp->client_index);        \
+    if (rp == 0)                                                        \
+      return;                                                           \
+                                                                        \
+    rmp = vl_msg_api_alloc_zero (sizeof (*rmp));                        \
+    rmp->_vl_msg_id = htons((t)+(REPLY_MSG_ID_BASE));                   \
+    rmp->context = mp->context;                                         \
+    rmp->retval = ntohl(rv);                                            \
+    do {body;} while (0);                                               \
+    vl_api_send_msg (rp, (u8 *)rmp);                                    \
+} while(0);
+
 #define REPLY_MACRO_DETAILS2(t, body)                                   \
 do {                                                                    \
     vl_api_registration_t *rp;                                          \
@@ -90,6 +106,22 @@ do {                                                                    \
     vl_api_send_msg (rp, (u8 *)rmp);                                    \
 } while(0);
 
+#define REPLY_MACRO3_ZERO(t, n, body)                                   \
+do {                                                                    \
+    vl_api_registration_t *rp;                                          \
+    rv = vl_msg_api_pd_handler (mp, rv);                                \
+    rp = vl_api_client_index_to_registration (mp->client_index);        \
+    if (rp == 0)                                                        \
+      return;                                                           \
+                                                                        \
+    rmp = vl_msg_api_alloc_zero (sizeof (*rmp) + n);                    \
+    rmp->_vl_msg_id = htons((t)+(REPLY_MSG_ID_BASE));                   \
+    rmp->context = mp->context;                                         \
+    rmp->retval = ntohl(rv);                                            \
+    do {body;} while (0);                                               \
+    vl_api_send_msg (rp, (u8 *)rmp);                                    \
+} while(0);
+
 #define REPLY_MACRO4(t, n, body)                                        \
 do {                                                                    \
     vl_api_registration_t *rp;                                          \