add qemu_iovec_init_external (Christoph Hellwig)
Allow to initialize a QEMUIOVector from an externally allocated iovec.
qiov->nalloc is initialized to -1 to indicate external storage for qiov->iov
and all functions dealing with memory management assert on the iovec beeing
an internally managed first.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6902 c046a42c-6fe2-441c-8c8c-71466251a162
diff --git a/cutils.c b/cutils.c
index 658746b..a1652ab 100644
--- a/cutils.c
+++ b/cutils.c
@@ -23,6 +23,7 @@
*/
#include "qemu-common.h"
#include "host-utils.h"
+#include <assert.h>
void pstrcpy(char *buf, int buf_size, const char *str)
{
@@ -112,8 +113,22 @@
qiov->size = 0;
}
+void qemu_iovec_init_external(QEMUIOVector *qiov, struct iovec *iov, int niov)
+{
+ int i;
+
+ qiov->iov = iov;
+ qiov->niov = niov;
+ qiov->nalloc = -1;
+ qiov->size = 0;
+ for (i = 0; i < niov; i++)
+ qiov->size += iov[i].iov_len;
+}
+
void qemu_iovec_add(QEMUIOVector *qiov, void *base, size_t len)
{
+ assert(qiov->nalloc != -1);
+
if (qiov->niov == qiov->nalloc) {
qiov->nalloc = 2 * qiov->nalloc + 1;
qiov->iov = qemu_realloc(qiov->iov, qiov->nalloc * sizeof(struct iovec));
@@ -126,11 +141,15 @@
void qemu_iovec_destroy(QEMUIOVector *qiov)
{
+ assert(qiov->nalloc != -1);
+
qemu_free(qiov->iov);
}
void qemu_iovec_reset(QEMUIOVector *qiov)
{
+ assert(qiov->nalloc != -1);
+
qiov->niov = 0;
qiov->size = 0;
}