tail: check OFF_T_MAX vs COPY_A_BUFFER

* src/tail.c: Document an otherwise-unstated assumption.

diff --git a/src/tail.c b/src/tail.c
index 255f581fa14c3745a6352707e8727d6535d9a862..8dd03a7c4d826973b20223d94baba80f78e32f4d 100644 (file)
--- a/src/tail.c
+++ b/src/tail.c
@@ -81,6 +81,7 @@
 /* Special values for dump_remainder's N_BYTES parameter.  */
 #define COPY_TO_EOF UINTMAX_MAX
 #define COPY_A_BUFFER (UINTMAX_MAX - 1)
+static_assert (OFF_T_MAX < COPY_A_BUFFER);
 
 /* FIXME: make Follow_name the default?  */
 #define DEFAULT_FOLLOW_MODE Follow_descriptor