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[Qemu-devel] [PATCH 03/16] Add iov_clear()
From: |
Gerd Hoffmann |
Subject: |
[Qemu-devel] [PATCH 03/16] Add iov_clear() |
Date: |
Thu, 4 Aug 2011 17:10:13 +0200 |
Fill the spefified area with zeros.
Signed-off-by: Gerd Hoffmann <address@hidden>
---
iov.c | 23 +++++++++++++++++++++++
iov.h | 2 ++
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);
--
1.7.1
- [Qemu-devel] [PULL] usb patch queue: iovecs, hid split, misc fixes, Gerd Hoffmann, 2011/08/04
- [Qemu-devel] [PATCH 02/16] Add iov_hexdump(), Gerd Hoffmann, 2011/08/04
- [Qemu-devel] [PATCH 04/16] move QEMUSGList typedef, Gerd Hoffmann, 2011/08/04
- [Qemu-devel] [PATCH 07/16] usb-host: iovec support, Gerd Hoffmann, 2011/08/04
- [Qemu-devel] [PATCH 06/16] usb-serial: iovec support, Gerd Hoffmann, 2011/08/04
- [Qemu-devel] [PATCH 08/16] usb-storage: iovec support, Gerd Hoffmann, 2011/08/04
- [Qemu-devel] [PATCH 03/16] Add iov_clear(),
Gerd Hoffmann <=
- [Qemu-devel] [PATCH 12/16] usb-hid: add event callback, Gerd Hoffmann, 2011/08/04
- [Qemu-devel] [PATCH 13/16] usb-hid: add hid_has_events(), Gerd Hoffmann, 2011/08/04
- [Qemu-devel] [PATCH 15/16] hid: move idle+protocol from usb-hid to hid too., Gerd Hoffmann, 2011/08/04
- [Qemu-devel] [PATCH 01/16] re-activate usb-host for bsd, Gerd Hoffmann, 2011/08/04