tail: fix -c +N. Closes 4111

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

1 files changed, 8 insertions, 0 deletions

diff --git a/testsuite/tail.tests b/testsuite/tail.tests
index 7140da262..305a83b15 100755
--- a/testsuite/tail.tests
+++ b/testsuite/tail.tests
@@ -14,4 +14,12 @@ testing "tail: +N with N > file length" \
         "0\n" \
         "" "qw"
 
+testing "tail: -c +N with largish N" \
+        "
+        dd if=/dev/zero bs=16k count=1 2>/dev/null | tail -c +8200 | wc -c;
+        dd if=/dev/zero bs=16k count=1 2>/dev/null | tail -c +8208 | wc -c;
+        " \
+        "8185\n8177\n" \
+        "" ""
+
 exit $FAILCOUNT