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/* libs/diskconfig/write_lst.c
*
* Copyright 2008, The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#define LOG_TAG "write_lst"
#include <sys/types.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <cutils/log.h>
#include <diskconfig/diskconfig.h>
struct write_list *
alloc_wl(uint32_t data_len)
{
struct write_list *item;
if (!(item = malloc(sizeof(struct write_list) + data_len))) {
ALOGE("Unable to allocate memory.");
return NULL;
}
item->len = data_len;
return item;
}
void
free_wl(struct write_list *item)
{
if (item)
free(item);
}
struct write_list *
wlist_add(struct write_list **lst, struct write_list *item)
{
item->next = (*lst);
*lst = item;
return item;
}
void
wlist_free(struct write_list *lst)
{
struct write_list *temp_wr;
while (lst) {
temp_wr = lst->next;
free_wl(lst);
lst = temp_wr;
}
}
int
wlist_commit(int fd, struct write_list *lst, int test)
{
for(; lst; lst = lst->next) {
if (lseek64(fd, lst->offset, SEEK_SET) != (loff_t)lst->offset) {
ALOGE("Cannot seek to the specified position (%lld).", lst->offset);
goto fail;
}
if (!test) {
if (write(fd, lst->data, lst->len) != (int)lst->len) {
ALOGE("Failed writing %u bytes at position %lld.", lst->len,
lst->offset);
goto fail;
}
} else
ALOGI("Would write %d bytes @ offset %lld.", lst->len, lst->offset);
}
return 0;
fail:
return -1;
}
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