Fix minor ssize_t / ptrdiff_t confusion

* src/fileio.c (Fcopy_file): This limit is because of ssize_t,
so use TYPE_MAXIMUM (ssize_t) not PTRDIFF_MAX.

1 files changed, 2 insertions, 1 deletions

diff --git a/src/fileio.c b/src/fileio.c
index f7376ce74fe..b141f568d70 100644
--- a/src/fileio.c
+++ b/src/fileio.c
@@ -2125,7 +2125,8 @@ permissions.  */)
           /* Copy at most COPY_MAX bytes at a time; this is min
              (PTRDIFF_MAX, SIZE_MAX) truncated to a value that is
              surely aligned well.  */
-          ptrdiff_t copy_max = min (PTRDIFF_MAX, SIZE_MAX) >> 30 << 30;
+          ssize_t ssize_max = TYPE_MAXIMUM (ssize_t);
+          ptrdiff_t copy_max = min (ssize_max, SIZE_MAX) >> 30 << 30;
           off_t intail = insize - newsize;
           ptrdiff_t len = min (intail, copy_max);
           copied = copy_file_range (ifd, NULL, ofd, NULL, len, 0);