Rename arguments and use size_t for sizes instead of int
-qemu_sendv(int sockfd, struct iovec *iov, int len, int iov_offset)
+qemu_sendv(int sockfd, struct iovec *iov, size_t bytes, size_t offset)
The main motivation was to make it clear that length and offset are
in _bytes_, not in iov elements: it was very confusing before, because
all standard functions which deals with iovecs expects number of iovs,
not bytes, even the fact that struct iovec has iov_len and iov_ prefix
does not help. With "bytes" and "offset", especially since they're
now size_t, it is much more explicit.
All callers of qemu_sendv() and qemu_recvv() and related, like
qemu_co_sendv() and qemu_co_recvv(), were checked to verify that
it is safe to use unsigned datatype instead of int.
While at it, clean up misleading comment near do_sendv_recvv().
Signed-off-by: Michael Tokarev <m...@tls.msk.ru>
---
cutils.c | 34 ++++++++++++----------------------
qemu-common.h | 4 ++--
2 files changed, 14 insertions(+), 24 deletions(-)
diff --git a/cutils.c b/cutils.c
index 27687c8..89305ad 100644
--- a/cutils.c
+++ b/cutils.c
@@ -424,38 +424,28 @@ int qemu_parse_fd(const char *param)
*
* This function send/recv data from/to the iovec buffer directly.
* The first `offset' bytes in the iovec buffer are skipped and next
- * `len' bytes are used.
- *
- * For example,
- *
- * do_sendv_recvv(sockfd, iov, len, offset, 1);
- *
- * is equal to
- *
- * char *buf = malloc(size);
- * iov_to_buf(iov, iovcnt, buf, offset, size);
- * send(sockfd, buf, size, 0);
- * free(buf);
+ * `bytes' bytes are used.
*/
-static int do_sendv_recvv(int sockfd, struct iovec *iov, int len, int offset,
+static int do_sendv_recvv(int sockfd, struct iovec *iov, size_t bytes, size_t
offset,
int do_sendv)
{
- int ret, diff, iovlen;
+ int ret, iovlen;
+ size_t diff;
struct iovec *last_iov;
/* last_iov is inclusive, so count from one. */
iovlen = 1;
last_iov = iov;
- len += offset;
+ bytes += offset;
- while (last_iov->iov_len < len) {
- len -= last_iov->iov_len;
+ while (last_iov->iov_len < bytes) {
+ bytes -= last_iov->iov_len;
last_iov++;
iovlen++;
}
- diff = last_iov->iov_len - len;
+ diff = last_iov->iov_len - bytes;
last_iov->iov_len -= diff;
while (iov->iov_len <= offset) {
@@ -517,13 +507,13 @@ static int do_sendv_recvv(int sockfd, struct iovec *iov,
int len, int offset,
return ret;
}
-int qemu_recvv(int sockfd, struct iovec *iov, int len, int iov_offset)
+int qemu_recvv(int sockfd, struct iovec *iov, size_t bytes, size_t offset)
{
- return do_sendv_recvv(sockfd, iov, len, iov_offset, 0);
+ return do_sendv_recvv(sockfd, iov, bytes, offset, 0);
}
-int qemu_sendv(int sockfd, struct iovec *iov, int len, int iov_offset)
+int qemu_sendv(int sockfd, struct iovec *iov, size_t bytes, size_t offset)
{
- return do_sendv_recvv(sockfd, iov, len, iov_offset, 1);
+ return do_sendv_recvv(sockfd, iov, bytes, offset, 1);
}
diff --git a/qemu-common.h b/qemu-common.h
index b7e426e..c0536b3 100644
--- a/qemu-common.h
+++ b/qemu-common.h
@@ -199,8 +199,8 @@ int qemu_pipe(int pipefd[2]);
#define qemu_recv(sockfd, buf, len, flags) recv(sockfd, buf, len, flags)
#endif
-int qemu_recvv(int sockfd, struct iovec *iov, int len, int iov_offset);
-int qemu_sendv(int sockfd, struct iovec *iov, int len, int iov_offset);
+int qemu_recvv(int sockfd, struct iovec *iov, size_t bytes, size_t offset);
+int qemu_sendv(int sockfd, struct iovec *iov, size_t bytes, size_t offset);
/* Error handling. */
--
1.7.9.1
