[Qemu-devel] [PATCH 2/4] Add qemu_iovec_reset()

[Avi Kivity <avi@redhat.com>]

Add a helper to zero out an existing iovec.  Removes the need to deallocate
and reallocate it.

Signed-off-by: Avi Kivity <avi@redhat.com>
---
 cutils.c      |    6 ++++++
 qemu-common.h |    1 +
 2 files changed, 7 insertions(+), 0 deletions(-)

diff --git a/cutils.c b/cutils.c
index 1090aa4..658746b 100644
--- a/cutils.c
+++ b/cutils.c
@@ -129,6 +129,12 @@ void qemu_iovec_destroy(QEMUIOVector *qiov)
     qemu_free(qiov->iov);
 }
 
+void qemu_iovec_reset(QEMUIOVector *qiov)
+{
+    qiov->niov = 0;
+    qiov->size = 0;
+}
+
 void qemu_iovec_to_buffer(QEMUIOVector *qiov, void *buf)
 {
     uint8_t *p = (uint8_t *)buf;
diff --git a/qemu-common.h b/qemu-common.h
index 8aef558..db33493 100644
--- a/qemu-common.h
+++ b/qemu-common.h
@@ -201,6 +201,7 @@ typedef struct QEMUIOVector {
 void qemu_iovec_init(QEMUIOVector *qiov, int alloc_hint);
 void qemu_iovec_add(QEMUIOVector *qiov, void *base, size_t len);
 void qemu_iovec_destroy(QEMUIOVector *qiov);
+void qemu_iovec_reset(QEMUIOVector *qiov);
 void qemu_iovec_to_buffer(QEMUIOVector *qiov, void *buf);
 void qemu_iovec_from_buffer(QEMUIOVector *qiov, const void *buf, size_t count);
 
-- 
1.6.1.1