Initial checkin

1 files changed, 99 insertions, 0 deletions

diff --git a/libshouldbeinlibc/ugids.c b/libshouldbeinlibc/ugids.c
new file mode 100644
index 00000000..5ccb9334
--- /dev/null
+++ b/libshouldbeinlibc/ugids.c
@@ -0,0 +1,99 @@
+/* Frob user and group ids
+
+   Copyright (C) 1997 Free Software Foundation, Inc.
+
+   Written by Miles Bader <miles@gnu.ai.mit.edu>
+
+   This program 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.
+
+   This program 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., 675 Mass Ave, Cambridge, MA 02139, USA. */
+
+#include <stdlib.h>
+#include <string.h>
+
+#include "ugids.h"
+
+/* Return a new ugids structure, or 0 if an allocation error occurs.  */
+struct ugids *
+make_ugids ()
+{
+  struct ugids *u = malloc (sizeof (struct ugids));
+  if (u)
+    bzero (u, sizeof *u);
+  return u;
+}
+
+/* Add a new uid to UGIDS.  If AVAIL is true, it's added to the avail uids
+   instead of the effective ones.  */
+error_t
+ugids_add_uid (struct ugids *ugids, uid_t uid, int avail)
+{
+  return idvec_add_new (avail ? &ugids->avail_uids : &ugids->eff_uids, uid);
+}
+
+/* Add a new gid to UGIDS.  If AVAIL is true, it's added to the avail gids
+   instead of the effective ones.  */
+error_t
+ugids_add_gid (struct ugids *ugids, gid_t gid, int avail)
+{
+  error_t err =
+    idvec_add_new (avail ? &ugids->avail_gids : &ugids->eff_gids, gid);
+  if (! err)
+    /* Since this gid is now explicit, remove it from the appropiate implied
+       set. */
+    idvec_remove (avail ? &ugids->imp_avail_gids : &ugids->imp_eff_gids,
+		  0, gid);
+  return err;
+}
+
+/* Add UID to UGIDS, plus any gids to which that user belongs.  If AVAIL is
+   true, the are added to the avail gids instead of the effective ones.  */
+error_t
+ugids_add_user (struct ugids *ugids, uid_t uid, int avail)
+{
+  error_t err;
+  struct idvec imp_gids = IDVEC_INIT;
+  uid_t uids_ids[] = { uid };
+  struct idvec uids = { uids_ids, 1 };
+  struct idvec *gids = avail ? &ugids->avail_gids : &ugids->eff_gids;
+
+  err = idvec_merge_implied_gids (&imp_gids, &uids);
+  if (! err)
+    {
+      /* Now remove any gids we already know about from IMP_GIDS.  For gids
+	 that weren't in the appropiate implied set before, this will
+	 ensure that they remain out after we merge IMP_GIDS into it, and
+	 ones that *were*, they will remain so.  */
+      idvec_subtract (&imp_gids, gids);
+
+      /* Try to add UID.  */
+      err = idvec_add_new (avail ? &ugids->avail_uids : &ugids->eff_uids, uid);
+
+      if (! err)
+	/* Now that we've added UID, we can add appropriate implied gids.
+	   [If this fails, UGIDS will be an inconsistent state, but things
+	   are probably fucked anyhow] */
+	err =
+	  idvec_merge (avail ? &ugids->avail_gids : &ugids->eff_gids,
+		       &imp_gids);
+      if (! err)
+	err = idvec_merge ((avail
+			    ? &ugids->imp_avail_gids
+			    : &ugids->imp_eff_gids),
+			   &imp_gids);
+    }
+
+  idvec_fini (&imp_gids);
+
+  return err;
+}