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149 lines
3.7 KiB
C
149 lines
3.7 KiB
C
/*-
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* Copyright 2020 Toomas Soome <tsoome@me.com>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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* Big Theory Statement.
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*
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* nvstore is abstraction layer to implement data read/write to different
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* types of non-volatile storage.
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*
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* User interfaces:
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* Provide mapping via environment: setenv/unsetenv/putenv. Access via
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* environment functions/commands is available once nvstore has
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* attached the backend and stored textual data is mapped to environment.
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*
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* nvstore_init(): attach new backend and create the environment mapping.
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* nvstore_fini: detach backend and unmap the related environment.
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*
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* The disk based storage, such as UFS file or ZFS bootenv label area, is
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* only accessible after root file system is set. Root file system change
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* will switch the back end storage.
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*/
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#include <stdbool.h>
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#include <sys/queue.h>
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#include "stand.h"
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#include "nvstore.h"
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nvstore_list_t stores = STAILQ_HEAD_INITIALIZER(stores);
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void *
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nvstore_get_store(const char *name)
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{
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nvstore_t *st;
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st = NULL;
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STAILQ_FOREACH(st, &stores, nvs_next) {
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if (strcmp(name, st->nvs_name) == 0)
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break;
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}
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return (st);
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}
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int
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nvstore_init(const char *name, nvs_callbacks_t *cb, void *data)
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{
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nvstore_t *st;
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st = nvstore_get_store(name);
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if (st != NULL)
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return (EEXIST);
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if ((st = malloc(sizeof (*st))) == NULL)
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return (ENOMEM);
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if ((st->nvs_name = strdup(name)) == NULL) {
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free(st);
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return (ENOMEM);
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}
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st->nvs_data = data;
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st->nvs_cb = cb;
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STAILQ_INSERT_TAIL(&stores, st, nvs_next);
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return (0);
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}
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int
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nvstore_fini(const char *name)
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{
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nvstore_t *st;
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st = nvstore_get_store(name);
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if (st == NULL)
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return (ENOENT);
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STAILQ_REMOVE(&stores, st, nvstore, nvs_next);
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free(st->nvs_name);
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free(st->nvs_data);
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free(st);
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return (0);
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}
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int
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nvstore_print(void *ptr)
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{
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nvstore_t *st = ptr;
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return (st->nvs_cb->nvs_iterate(st->nvs_data, st->nvs_cb->nvs_print));
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}
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int
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nvstore_get_var(void *ptr, const char *name, void **data)
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{
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nvstore_t *st = ptr;
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return (st->nvs_cb->nvs_getter(st->nvs_data, name, data));
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}
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int
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nvstore_set_var(void *ptr, int type, const char *name,
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void *data, size_t size)
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{
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nvstore_t *st = ptr;
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return (st->nvs_cb->nvs_setter(st->nvs_data, type, name, data, size));
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}
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int
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nvstore_set_var_from_string(void *ptr, const char *type, const char *name,
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const char *data)
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{
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nvstore_t *st = ptr;
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return (st->nvs_cb->nvs_setter_str(st->nvs_data, type, name, data));
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}
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int
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nvstore_unset_var(void *ptr, const char *name)
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{
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nvstore_t *st = ptr;
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return (st->nvs_cb->nvs_unset(st->nvs_data, name));
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}
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