Initial revision

4 files changed, 308 insertions, 0 deletions

diff --git a/libstore/flags.c b/libstore/flags.c
new file mode 100644
index 00000000..5d2ce74b
--- /dev/null
+++ b/libstore/flags.c
@@ -0,0 +1,64 @@
+/* Setting various store flags
+
+   Copyright (C) 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"
+
+/* Add FLAGS to STORE's currently set flags.  */
+error_t
+store_set_flags (struct store *store, int flags)
+{
+  error_t err = 0;
+  int orig = store->flags, new = flags & ~orig;
+
+  if (new & STORE_BACKEND_FLAGS)
+    if (store->class->set_flags)
+      err = (*store->class->set_flags) (store, new);
+    else
+      err = EINVAL;
+
+  if (! err)
+    store->flags |= (new & ~STORE_BACKEND_FLAGS);
+
+  return err;
+}
+
+/* Remove FLAGS from STORE's currently set flags.  */
+error_t
+store_clear_flags (struct store *store, int flags)
+{
+  error_t err = 0;
+  int orig = store->flags, kill = flags & orig;
+
+  if (kill & STORE_BACKEND_FLAGS)
+    if (store->class->clear_flags)
+      err = (*store->class->clear_flags) (store, kill);
+    else
+      err = EINVAL;
+
+  if (! err)
+    store->flags &= ~(kill & ~STORE_BACKEND_FLAGS);
+
+  return err;
+}
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;
+}
diff --git a/libstore/null.c b/libstore/null.c
new file mode 100644
index 00000000..dd30ded1
--- /dev/null
+++ b/libstore/null.c
@@ -0,0 +1,109 @@
+/* Null store backend
+
+   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 <assert.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "store.h"
+
+static error_t
+null_read (struct store *store,
+	   off_t addr, size_t index, mach_msg_type_number_t amount,
+	   char **buf, mach_msg_type_number_t *len)
+{
+  if (*len < amount)
+    {
+      error_t err =
+	vm_allocate (mach_task_self (), (vm_address_t *)buf, amount, 1);
+      if (! err)
+	*len = amount;
+      return err;
+    }
+  else
+    {
+      bzero (*buf, amount);
+      *len = amount;
+      return 0;
+    }
+}
+
+static error_t
+null_write (struct store *store,
+	   off_t addr, size_t index, char *buf, mach_msg_type_number_t len,
+	   mach_msg_type_number_t *amount)
+{
+  return 0;
+}
+
+error_t
+null_allocate_encoding (const struct store *store, struct store_enc *enc)
+{
+  enc->num_ints += 2;
+  enc->num_offsets += 1;
+  return 0;
+}
+
+error_t
+null_encode (const struct store *store, struct store_enc *enc)
+{
+  enc->ints[enc->cur_int++] = store->class->id;
+  enc->ints[enc->cur_int++] = store->flags;
+  enc->offsets[enc->cur_offset++] = store->size;
+  return 0;
+}
+
+error_t
+null_decode (struct store_enc *enc, struct store_class *classes,
+	     struct store **store)
+{
+  off_t size;
+  int type, flags;
+
+  if (enc->cur_int + 2 > enc->num_ints
+      || enc->cur_offset + 1 > enc->num_offsets)
+    return EINVAL;
+
+  type = enc->ints[enc->cur_int++];
+  flags = enc->ints[enc->cur_int++];
+  size = enc->offsets[enc->cur_offset++];
+
+  return store_null_create (size, flags, store);
+}
+
+static struct store_class
+null_class =
+{
+  STORAGE_NULL, "null", null_read, null_write,
+  null_allocate_encoding, null_encode, null_decode
+};
+_STORE_STD_CLASS (null_class);
+
+/* Return a new null store SIZE bytes long in STORE.  */
+error_t
+store_null_create (size_t size, int flags, struct store **store)
+{
+  struct store_run run = { 0, size };
+  *store = _make_store (&null_class, MACH_PORT_NULL, flags, 1, &run, 1, 0);
+  return *store ? 0 : ENOMEM;
+}
diff --git a/libstore/std.c b/libstore/std.c
new file mode 100644
index 00000000..37edc73b
--- /dev/null
+++ b/libstore/std.c
@@ -0,0 +1,33 @@
+/* List of standard store classes
+
+   Copyright (C) 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 "store.h"
+
+struct store_class *
+store_std_classes = 0;
+
+void
+_store_add_std_class (struct store_class *class)
+{
+  class->next = store_std_classes;
+  store_std_classes = class;
+}