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| -rw-r--r-- | libstore/null.c | 109 |
1 files changed, 0 insertions, 109 deletions
diff --git a/libstore/null.c b/libstore/null.c deleted file mode 100644 index dd30ded1..00000000 --- a/libstore/null.c +++ /dev/null @@ -1,109 +0,0 @@ -/* 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; -} |