Add qemu_iovec_reset() (Avi Kivity)

Add a helper to zero out an existing iovec.  Removes the need to deallocate
and reallocate it.
Signed-off-by: NAvi Kivity <avi@redhat.com>
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>


git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6523 c046a42c-6fe2-441c-8c8c-71466251a162

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;

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);