Signed-off-by: Ken-ichirou MATSUZAWA <chamas@xxxxxxxxxxxxx>
---
include/libmnl/libmnl.h | 1 +
src/libmnl.map | 1 +
src/nlmsg.c | 20 ++++++++++++++++++++
3 files changed, 22 insertions(+)
diff --git a/include/libmnl/libmnl.h b/include/libmnl/libmnl.h
index 722cb79..603abc5 100644
--- a/include/libmnl/libmnl.h
+++ b/include/libmnl/libmnl.h
@@ -74,6 +74,7 @@ extern void mnl_nlmsg_batch_reset(struct mnl_nlmsg_batch *b);
extern void *mnl_nlmsg_batch_head(struct mnl_nlmsg_batch *b);
extern void *mnl_nlmsg_batch_current(struct mnl_nlmsg_batch *b);
extern bool mnl_nlmsg_batch_is_empty(struct mnl_nlmsg_batch *b);
+extern void mnl_nlmsg_batch_reset_buffer(struct mnl_nlmsg_batch *b, void *buf, size_t limit);
/*
* Netlink attributes API
diff --git a/src/libmnl.map b/src/libmnl.map
index d329988..4de63b5 100644
--- a/src/libmnl.map
+++ b/src/libmnl.map
@@ -85,4 +85,5 @@ LIBMNL_1.2 {
mnl_ring_build_frame;
mnl_ring_parse_frame2;
mnl_ring_parse_frame;
+ mnl_nlmsg_batch_reset_buffer;
} LIBMNL_1.1;
diff --git a/src/nlmsg.c b/src/nlmsg.c
index fdb7af8..0210067 100644
--- a/src/nlmsg.c
+++ b/src/nlmsg.c
@@ -569,5 +569,25 @@ bool mnl_nlmsg_batch_is_empty(struct mnl_nlmsg_batch *b)
EXPORT_SYMBOL(mnl_nlmsg_batch_is_empty);
/**
+ * mnl_nlmsg_batch_reset_buffer - reset to the new buffer
+ */
+void mnl_nlmsg_batch_reset_buffer(struct mnl_nlmsg_batch *b, void *buf, size_t limit)
+{
+ if (b->overflow) {
+ struct nlmsghdr *nlh = b->cur;
+ memcpy(buf, b->cur, nlh->nlmsg_len);
+ b->buflen = nlh->nlmsg_len;
+ b->cur = buf + b->buflen;
+ b->overflow = false;
+ } else {
+ b->buflen = 0;
+ b->cur = buf;
+ }
+ b->buf = buf;
+ b->limit = limit;
+}
+EXPORT_SYMBOL(mnl_nlmsg_batch_reset_buffer);
+
+/**
* @}
*/
--
1.8.4.rc3
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