Add four utility functions related to struct grp processing modeled in-part

after similar calls related to struct pwd in libutil/pw_util.c:
  - gr_equal()
    Perform a deep comparison of two struct grp's.  It does a thorough, yet
    unoptimized comparison of all the members regardless of order.

  - gr_make()
    Create a string (see group(5)) from a struct grp.

  - gr_dup()
    Duplicate a struct grp.  Returns a value that is a single contiguous
    block of memory.

  - gr_scan()
    Create a struct grp from a string (as produced by gr_make()).

MFC after:	3 weeks

1 files changed, 12 insertions, 0 deletions

diff --git a/tools/regression/lib/libutil/test-grp.t b/tools/regression/lib/libutil/test-grp.t
new file mode 100644
index 0000000..cbb7c8c
--- /dev/null
+++ b/tools/regression/lib/libutil/test-grp.t
@@ -0,0 +1,12 @@
+#!/bin/sh
+#
+# $FreeBSD$
+#
+
+base=$(realpath $(dirname $0))
+name=$(basename $0 .t)
+
+set -e
+cd $base
+make -s $name >/dev/null
+exec $base/$name