yamt commented on code in PR #14898:
URL: https://github.com/apache/nuttx/pull/14898#discussion_r1914422861
##########
fs/vfs/fs_uio.c:
##########
@@ -51,18 +51,69 @@ ssize_t uio_total_len(FAR const struct uio *uio)
{
const struct iovec *iov = uio->uio_iov;
int iovcnt = uio->uio_iovcnt;
+ size_t offset_in_iov = uio->uio_offset_in_iov;
size_t len = 0;
int i;
for (i = 0; i < iovcnt; i++)
{
- if (SSIZE_MAX - len < iov[i].iov_len)
+ DEBUGASSERT(offset_in_iov <= iov[i].iov_len);
+ if (SSIZE_MAX - len < iov[i].iov_len - offset_in_iov)
{
return -EOVERFLOW;
}
- len += iov[i].iov_len;
+ len += iov[i].iov_len - offset_in_iov;
+ offset_in_iov = 0;
}
return len;
}
+
+/****************************************************************************
+ * Name: uio_advance
+ *
+ * Description:
+ * Advance the pointer/offset in uio by the specified amount.
+ *
+ ****************************************************************************/
+
+void uio_advance(FAR struct uio *uio, size_t sz)
+{
+ FAR const struct iovec *iov = uio->uio_iov;
+ int iovcnt = uio->uio_iovcnt;
+ size_t offset_in_iov = uio->uio_offset_in_iov;
+
+ DEBUGASSERT(sz <= uio_total_len(uio));
+ while (iovcnt > 0)
+ {
+ DEBUGASSERT(offset_in_iov <= iov->iov_len);
+ if (sz < iov->iov_len - offset_in_iov)
+ {
+ offset_in_iov += sz;
+ break;
+ }
+
+ sz -= iov->iov_len;
Review Comment:
the latest version has it.
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