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/* 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,
const struct store_class *const *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;
}
/* Set FLAGS in all children of STORE, and if successfull, add FLAGS to
STORE's flags. */
error_t
store_set_child_flags (struct store *store, int flags)
{
int i;
error_t err = 0;
int old_child_flags[store->num_children];
for (i = 0; i < store->num_children && !err; i++)
{
old_child_flags[i] = store->children[i]->flags;
err = store_set_flags (store->children[i], flags);
}
if (err)
while (i > 0)
store_clear_flags (store->children[--i], flags & ~old_child_flags[i]);
else
store->flags |= flags;
return err;
}
/* Clear FLAGS in all children of STORE, and if successfull, remove FLAGS from
STORE's flags. */
error_t
store_clear_child_flags (struct store *store, int flags)
{
int i;
error_t err = 0;
int old_child_flags[store->num_children];
for (i = 0; i < store->num_children && !err; i++)
{
old_child_flags[i] = store->children[i]->flags;
err = store_clear_flags (store->children[i], flags);
}
if (err)
while (i > 0)
store_set_flags (store->children[--i], flags & ~old_child_flags[i]);
else
store->flags &= ~flags;
return err;
}
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