Initial revision

1 files changed, 102 insertions, 0 deletions

diff --git a/libstore/kids.c b/libstore/kids.c
new file mode 100644
index 00000000..7c6cf51d
--- /dev/null
+++ b/libstore/kids.c
@@ -0,0 +1,102 @@
+/* Managing sub-stores
+
+   Copyright (C) 1995, 1996 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., 675 Mass Ave, Cambridge, MA 02139, USA. */
+
+#include <malloc.h>
+#include <string.h>
+
+#include "store.h"
+
+/* Set STORE's current children list to (a copy of) CHILDREN and NUM_CHILDREN.  */
+error_t
+store_set_children (struct store *store,
+		    struct store *const *children, unsigned num_children)
+{
+  unsigned size = num_children * sizeof (struct store_run);
+  struct store **copy = malloc (size);
+
+  if (!copy)
+    return ENOMEM;
+
+  if (store->children)
+    free (store->children);
+
+  bcopy (children, copy, size);
+  store->children = copy;
+  store->num_children = num_children;
+
+  return 0;
+}
+
+/* Calls the allocate_encoding method in each child store of STORE,
+   propagating any errors.  If any child does not hae such a method,
+   EOPNOTSUPP is returned.  */
+error_t
+store_allocate_child_encodings (const struct store *store,
+				struct store_enc *enc)
+{
+  int i;
+  error_t err = 0;
+  for (i = 0; i < store->num_children && !err; i++)
+    {
+      struct store *k = store->children[i];
+      if (k->class->allocate_encoding)
+	(*k->class->allocate_encoding) (store, enc);
+      else
+	err = EOPNOTSUPP;
+    }
+  return err;
+}
+
+/* Calls the encode method in each child store of STORE, propagating any
+   errors.  If any child does not hae such a method, EOPNOTSUPP is returned. */
+error_t
+store_encode_children (const struct store *store, struct store_enc *enc)
+{
+  int i;
+  error_t err = 0;
+  for (i = 0; i < store->num_children && !err; i++)
+    {
+      struct store *k = store->children[i];
+      if (k->class->encode)
+	(*k->class->encode) (store, enc);
+      else
+	err = EOPNOTSUPP;
+    }
+  return err;
+}
+
+/* Decodes NUM_CHILDREN from ENC, storing the results into successive
+   positions in CHILDREN.  */
+error_t
+store_decode_children (struct store_enc *enc, int num_children,
+		       struct store_class *classes, struct store **children)
+{
+  int i;
+  error_t err = 0;
+  for (i = 0; i < num_children && !err; i++)
+    err = store_decode (enc, classes, &children[i]);
+  if (err)
+    /* Deallocate anything we've already created.  */
+    while (--i >= 0)
+      store_free (children[i]);
+  return err;
+}