(skip): Use fseeko rather than lseek.

(Also, check for overflow when converting uintmax_t to off_t.)

diff --git a/src/od.c b/src/od.c
index ad73bb2..a08a7a5 100644 (file)
--- a/src/od.c
+++ b/src/od.c
@@ -1081,7 +1081,10 @@ skip (uintmax_t n_skip)
                n_skip -= file_stats.st_size;
              else
                {
-                 if (lseek (fileno (in_stream), n_skip, SEEK_CUR) < 0)
+                 off_t offset = n_skip;
+                 if (offset == n_skip && 0 <= offset
+                     ? fseeko (in_stream, offset, SEEK_CUR) != 0
+                     : (errno = EOVERFLOW, 1))
                    {
                      error (0, errno, "%s", input_filename);
                      err = 1;