summaryrefslogtreecommitdiff
path: root/cutils.c
diff options
context:
space:
mode:
authoraliguori <aliguori@c046a42c-6fe2-441c-8c8c-71466251a162>2009-03-28 17:46:10 +0000
committeraliguori <aliguori@c046a42c-6fe2-441c-8c8c-71466251a162>2009-03-28 17:46:10 +0000
commit522584a57bccbb78ea14799263f50730d4dc8583 (patch)
tree56bc7795752ae34a20251785ae0f8b71b91d8d6c /cutils.c
parentcef3017cd7c0d63a12ff743e1e72caf49779c493 (diff)
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
Diffstat (limited to 'cutils.c')
-rw-r--r--cutils.c19
1 files changed, 19 insertions, 0 deletions
diff --git a/cutils.c b/cutils.c
index 658746b8f..a1652ab0b 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 @@ void qemu_iovec_init(QEMUIOVector *qiov, int alloc_hint)
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_add(QEMUIOVector *qiov, void *base, size_t len)
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;
}