Initial checkin

1 files changed, 151 insertions, 0 deletions

diff --git a/usermux/leaf.c b/usermux/leaf.c
new file mode 100644
index 00000000..bacaee9d
--- /dev/null
+++ b/usermux/leaf.c
@@ -0,0 +1,151 @@
+/* Usermux leaf node functions
+
+   Copyright (C) 1997 Free Software Foundation, Inc.
+   Written by Miles Bader <miles@gnu.ai.mit.edu>
+   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 <stdio.h>
+#include <string.h>
+#include <pwd.h>
+#include <argz.h>
+#include <hurd/paths.h>
+
+#include "usermux.h"
+
+/* Read the contents of NODE (a symlink), for USER, into BUF. */
+error_t
+netfs_attempt_readlink (struct iouser *user, struct node *node, char *buf)
+{
+  assert (node->nn->name);
+  /* For symlink nodes, the translator spec just contains the link target. */
+  memcpy (buf, node->nn->trans, node->nn->trans_len);
+  fshelp_touch (&node->nn_stat, TOUCH_ATIME, usermux_maptime);
+  return 0;
+}
+
+/* For locked node NODE with S_IPTRANS set in its mode, look up the name of
+   its translator.  Store the name into newly malloced storage, and return it
+   in *ARGZ; set *ARGZ_LEN to the total length.
+
+   For usermux, this creates a new translator string by instantiating the
+   global translator template.  */
+error_t
+netfs_get_translator (struct node *node, char **trans, size_t *trans_len)
+{
+  if (! node->nn->name)
+    return EINVAL;
+  else
+    {
+      fshelp_touch (&node->nn_stat, TOUCH_ATIME, usermux_maptime);
+      *trans = 0;
+      *trans_len = 0;
+      if (S_ISLNK (node->nn_stat.st_mode))
+	argz_add (trans, trans_len, _HURD_SYMLINK);
+      return
+	argz_append (trans, trans_len, node->nn->trans, node->nn->trans_len);
+    }
+}
+
+/* Create a new leaf node in MUX, with a name NAME, and return the new node
+   with a single reference in NODE.  */
+error_t
+create_user_node (struct usermux *mux, struct usermux_name *name,
+		  struct passwd *pw, struct node **node)
+{
+  error_t err;
+  struct node *new;
+  struct netnode *nn = malloc (sizeof (struct netnode));
+
+  if (! nn)
+    return ENOMEM;
+
+  nn->mux = mux;
+  nn->name = name;
+
+  new = netfs_make_node (nn);
+  if (! new)
+    {
+      free (nn);
+      return ENOMEM;
+    }
+
+  new->nn_stat = mux->stat_template;
+
+  new->nn_stat.st_ino = pw->pw_uid + USERMUX_FILENO_UID_OFFSET;
+
+  if (strcmp (mux->trans_template, _HURD_SYMLINK) == 0
+      && mux->trans_template_len == sizeof _HURD_SYMLINK)
+    {
+      err = argz_create_sep (pw->pw_dir, 0, &nn->trans, &nn->trans_len);
+      new->nn_stat.st_mode = (S_IFLNK | 0666);
+      new->nn_stat.st_size = nn->trans_len;
+    }
+  else
+    {
+      unsigned replace_count = 0;
+
+      nn->trans = 0;		/* Initialize return value.  */
+      nn->trans_len = 0;
+
+      err = argz_append (&nn->trans, &nn->trans_len,
+			 mux->trans_template, mux->trans_template_len);
+
+      /* Perform any substitutions.  */
+      if (!err && mux->user_pat && *mux->user_pat)
+	err = argz_replace (&nn->trans, &nn->trans_len,
+			    mux->user_pat, pw->pw_name,
+			    &replace_count);
+      if (!err && mux->home_pat && *mux->home_pat)
+	err = argz_replace (&nn->trans, &nn->trans_len,
+			    mux->home_pat, pw->pw_dir,
+			    &replace_count);
+      if (!err && mux->uid_pat && *mux->uid_pat)
+	{
+	  char uid_buf[10];
+	  snprintf (uid_buf, sizeof uid_buf, "%d", pw->pw_uid);
+	  err = argz_replace (&nn->trans, &nn->trans_len,
+			      mux->uid_pat, uid_buf,
+			      &replace_count);
+	}
+
+      if (!err && replace_count == 0)
+	/* Default, if no instances of any pattern occur, is to append the
+	   user home dir. */
+	err = argz_add (&nn->trans, &nn->trans_len, pw->pw_dir);
+
+      if (err && nn->trans_len > 0)
+	free (nn->trans);
+
+      new->nn_stat.st_mode = (S_IFREG | S_IPTRANS | 0666);
+      new->nn_stat.st_size = 0;
+    }
+
+  if (err)
+    {
+      free (nn);
+      free (new);
+      return err;
+    }
+
+  fshelp_touch (&new->nn_stat, TOUCH_ATIME|TOUCH_MTIME|TOUCH_CTIME,
+		usermux_maptime);
+
+  name->node = new;
+  *node = new;
+
+  return 0;
+}