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authorGerd Hoffmann <kraxel@redhat.com>2011-07-13 15:16:08 +0200
committerGerd Hoffmann <kraxel@redhat.com>2011-08-04 15:51:22 +0200
commit8d15028ec03999fa6eca8dba7ef7cd4eb575486b (patch)
treef1e307c00f1bf86de0e9a177f9069f3f005adfdd
parent3a1dca94d6dba00fe0fd4c4a28449f57e01b9b6c (diff)
downloadhqemu-8d15028ec03999fa6eca8dba7ef7cd4eb575486b.zip
hqemu-8d15028ec03999fa6eca8dba7ef7cd4eb575486b.tar.gz
Add iov_clear()
Fill the spefified area with zeros. Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
-rw-r--r--iov.c23
-rw-r--r--iov.h2
2 files changed, 25 insertions, 0 deletions
diff --git a/iov.c b/iov.c
index 60553c7..e7385c4 100644
--- a/iov.c
+++ b/iov.c
@@ -62,6 +62,29 @@ size_t iov_to_buf(const struct iovec *iov, const unsigned int iov_cnt,
return buf_off;
}
+size_t iov_clear(const struct iovec *iov, const unsigned int iov_cnt,
+ size_t iov_off, size_t size)
+{
+ size_t iovec_off, buf_off;
+ unsigned int i;
+
+ iovec_off = 0;
+ buf_off = 0;
+ for (i = 0; i < iov_cnt && size; i++) {
+ if (iov_off < (iovec_off + iov[i].iov_len)) {
+ size_t len = MIN((iovec_off + iov[i].iov_len) - iov_off , size);
+
+ memset(iov[i].iov_base + (iov_off - iovec_off), 0, len);
+
+ buf_off += len;
+ iov_off += len;
+ size -= len;
+ }
+ iovec_off += iov[i].iov_len;
+ }
+ return buf_off;
+}
+
size_t iov_size(const struct iovec *iov, const unsigned int iov_cnt)
{
size_t len;
diff --git a/iov.h b/iov.h
index c2c5b39..94d2f78 100644
--- a/iov.h
+++ b/iov.h
@@ -17,5 +17,7 @@ size_t iov_from_buf(struct iovec *iov, unsigned int iov_cnt,
size_t iov_to_buf(const struct iovec *iov, const unsigned int iov_cnt,
void *buf, size_t iov_off, size_t size);
size_t iov_size(const struct iovec *iov, const unsigned int iov_cnt);
+size_t iov_clear(const struct iovec *iov, const unsigned int iov_cnt,
+ size_t iov_off, size_t size);
void iov_hexdump(const struct iovec *iov, const unsigned int iov_cnt,
FILE *fp, const char *prefix, size_t limit);
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