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Add iov_clear()

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Fill the spefified area with zeros.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
Gerd Hoffmann 2011-07-13 15:16:08 +02:00
parent 3a1dca94d6
commit 8d15028ec0
2 changed files with 25 additions and 0 deletions
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23
iov.c
View File

@ -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;

2
iov.h
View File

@ -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);