/* 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).", (long long)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, (long long)lst->offset); goto fail; } } else ALOGI("Would write %d bytes @ offset %lld.", lst->len, (long long)lst->offset); } return 0; fail: return -1; }