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iov: reorganize iov_send_recv, part 3

Browse source 
"si" and "ei" are merged in a single variable.

Reviewed-by: Juan Quintela <quintela@redhat.com>
Reviewed-by: Orit Wassermann <owasserm@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2013-03-27 17:36:30 +01:00
parent 5209d6753c
commit f48869ad28
1 changed files with 15 additions and 15 deletions
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30
util/iov.c
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@ -146,7 +146,7 @@ ssize_t iov_send_recv(int sockfd, struct iovec *iov, unsigned iov_cnt,
{
ssize_t ret;
size_t orig_len, tail;
unsigned si, ei; /* start and end indexes */
unsigned niov;
if (bytes == 0) {
/* Catch the do-nothing case early, as otherwise we will pass an
@ -158,15 +158,15 @@ ssize_t iov_send_recv(int sockfd, struct iovec *iov, unsigned iov_cnt,
/* Find the start position, skipping `offset' bytes:
* first, skip all full-sized vector elements, */
for (si = 0; si < iov_cnt && offset >= iov[si].iov_len; ++si) {
offset -= iov[si].iov_len;
for (niov = 0; niov < iov_cnt && offset >= iov[niov].iov_len; ++niov) {
offset -= iov[niov].iov_len;
}
/* si == iov_cnt would only be valid if bytes == 0, which
/* niov == iov_cnt would only be valid if bytes == 0, which
* we already ruled out above. */
assert(si < iov_cnt);
iov += si;
iov_cnt -= si;
assert(niov < iov_cnt);
iov += niov;
iov_cnt -= niov;
if (offset) {
/* second, skip `offset' bytes from the (now) first element,
@ -177,23 +177,23 @@ ssize_t iov_send_recv(int sockfd, struct iovec *iov, unsigned iov_cnt,
/* Find the end position skipping `bytes' bytes: */
/* first, skip all full-sized elements */
tail = bytes;
for (ei = 0; ei < iov_cnt && iov[ei].iov_len <= tail; ++ei) {
tail -= iov[ei].iov_len;
for (niov = 0; niov < iov_cnt && iov[niov].iov_len <= tail; ++niov) {
tail -= iov[niov].iov_len;
}
if (tail) {
/* second, fixup the last element, and remember the original
* length */
assert(ei < iov_cnt);
assert(iov[ei].iov_len > tail);
orig_len = iov[ei].iov_len;
iov[ei++].iov_len = tail;
assert(niov < iov_cnt);
assert(iov[niov].iov_len > tail);
orig_len = iov[niov].iov_len;
iov[niov++].iov_len = tail;
}
ret = do_send_recv(sockfd, iov, ei, do_send);
ret = do_send_recv(sockfd, iov, niov, do_send);
/* Undo the changes above */
if (tail) {
iov[ei-1].iov_len = orig_len;
iov[niov-1].iov_len = orig_len;
}
if (offset) {
iov[0].iov_base -= offset;