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, 7 insertions, 0 deletions

diff --git a/libutil/libutil.h b/libutil/libutil.h
index aa663a7..8fafe9b 100644
--- a/libutil/libutil.h
+++ b/libutil/libutil.h
@@ -119,6 +119,13 @@ const char *pw_tempname(void);
 int	pw_tmp(int _mfd);
 #endif
 
+#ifdef _GRP_H_
+int	gr_equal(const struct group *gr1, const struct group *gr2);
+char	*gr_make(const struct group *gr);
+struct group *gr_dup(const struct group *gr);
+struct group *gr_scan(const char *line);
+#endif
+
 #ifdef _SYS_PARAM_H_
 struct pidfh *pidfile_open(const char *path, mode_t mode, pid_t *pidptr);
 int pidfile_write(struct pidfh *pfh);