1 files changed, 43 insertions, 0 deletions
diff --git a/libfshelp/perms-access.c b/libfshelp/perms-access.c
new file mode 100644
index 00000000..91ad9da8
--- /dev/null
+++ b/libfshelp/perms-access.c
@@ -0,0 +1,43 @@
+/* 
+   Copyright (C) 1999 Free Software Foundation, Inc.
+   Written by Thomas Bushnell, BSG.
+
+   This file is part of the GNU Hurd.
+
+   The GNU Hurd is free software; you can redistribute it and/or
+   modify it under the terms of the GNU General Public License as
+   published by the Free Software Foundation; either version 2, or (at
+   your option) any later version.
+
+   The GNU Hurd is distributed in the hope that it will be useful, but
+   WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA. */
+
+
+#include "fshelp.h"
+
+/* Check to see whether the user USER can operate on a file identified
+   by ST.  OP is one of S_IREAD, S_IWRITE, and S_IEXEC.  If the access
+   is permitted, return zero; otherwise return an appropriate error
+   code.  */
+error_t
+fshelp_access (struct stat *st, int op, struct iouser *user)
+{
+  int gotit;
+  if (idvec_contains (user->uids, 0))
+    gotit = 1;
+  else if (user->uids->num == 0 && (st->st_mode & S_IUSEUNK))
+    gotit = st->st_mode & (op << S_IUNKSHIFT);
+  else if (!fshelp_isowner (st, user))
+    gotit = st->st_mode & op;
+  else if (idvec_contains (user->gids, st->st_gid))
+    gotit = st->st_mode & (op >> 3);
+  else
+    gotit = st->st_mode & (op >> 6);
+  return gotit ? 0 : EACCES;
+}