From 522584a57bccbb78ea14799263f50730d4dc8583 Mon Sep 17 00:00:00 2001 From: aliguori Date: Sat, 28 Mar 2009 17:46:10 +0000 Subject: 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 Signed-off-by: Anthony Liguori git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6902 c046a42c-6fe2-441c-8c8c-71466251a162 --- cutils.c | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) (limited to 'cutils.c') diff --git a/cutils.c b/cutils.c index 658746b8f0..a1652ab0bc 100644 --- a/cutils.c +++ b/cutils.c @@ -23,6 +23,7 @@ */ #include "qemu-common.h" #include "host-utils.h" +#include 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; } -- cgit v1.2.3