cp: simplify integer overflow checking

* src/copy.c (sparse_copy): Use INT_ADD_WRAPV instead
of doing overflow checking by hand.

diff --git a/src/copy.c b/src/copy.c
index 65cf6589532c042e3b787fc589f8b5489b3f6e8f..cd6104c7a6ce9480ffb2a49d3a70f5ccedf49531 100644 (file)
--- a/src/copy.c
+++ b/src/copy.c
@@ -335,9 +335,7 @@ sparse_copy (int src_fd, int dest_fd, char *buf, size_t buf_size,
             }
           else  /* Coalesce writes/seeks.  */
             {
-              if (psize <= OFF_T_MAX - csize)
-                psize += csize;
-              else
+              if (INT_ADD_WRAPV (psize, csize, &psize))
                 {
                   error (0, 0, _("overflow reading %s"), quoteaf (src_name));
                   return false;