2 files changed, 47 insertions, 0 deletions

diff --git a/testsuite/rev.tests b/testsuite/rev.tests
new file mode 100755
index 000000000..dd65dcd3b
--- /dev/null
+++ b/testsuite/rev.tests
@@ -0,0 +1,46 @@
+#!/bin/sh
+# Copyright 2021 by Ron Yorston
+# Licensed under GPLv2, see file LICENSE in this source tree.
+
+. ./testing.sh
+
+# testing "test name" "commands" "expected result" "file input" "stdin"
+
+testing "rev works" \
+        "rev input" \
+"\
+1 enil
+
+3 enil
+" \
+        "line 1\n\nline 3\n" \
+        ""
+
+testing "rev file with missing newline" \
+        "rev input" \
+"\
+1 enil
+
+3 enil" \
+        "line 1\n\nline 3" \
+        ""
+
+testing "rev file with NUL character" \
+        "rev input" \
+"\
+nil
+3 enil
+" \
+        "lin\000e 1\n\nline 3\n" \
+        ""
+
+testing "rev file with long line" \
+        "rev input" \
+"\
++--------------+---------------+---------------+---------------+---------------+---------------+---------------+---------------+---------------+---------------+---------------+---------------+---------------+---------------+---------------+---------------
+cba
+" \
+        "---------------+---------------+---------------+---------------+---------------+---------------+---------------+---------------+---------------+---------------+---------------+---------------+---------------+---------------+---------------+--------------+\nabc\n" \
+        ""
+
+exit $FAILCOUNT
diff --git a/util-linux/rev.c b/util-linux/rev.c
index d439b4da8..63b005c67 100644
--- a/util-linux/rev.c
+++ b/util-linux/rev.c
@@ -109,6 +109,7 @@ int rev_main(int argc UNUSED_PARAM, char **argv)
                         strrev(buf, strlen(buf));
 #endif
                         fputs_stdout(buf);
+                        pos = 0;
                 }
                 fclose(fp);
         } while (*argv);