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contrib/android/block_range.c
80 строк
2 KB
David Anderson
AOSP: e2fsdroid: Refactor block_range.
01 янв 2020, 21:41
01 янв 2020, 21:41
269f4c1
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#define _GNU_SOURCE #include "block_range.h" #include <stdio.h> struct block_range *new_block_range(blk64_t start, blk64_t end) { struct block_range *range = malloc(sizeof(*range)); range->start = start; range->end = end; range->next = NULL; return range; } void add_blocks_to_range(struct block_range_list *list, blk64_t blk_start, blk64_t blk_end) { if (list->head == NULL) list->head = list->tail = new_block_range(blk_start, blk_end); else if (list->tail->end + 1 == blk_start) list->tail->end += (blk_end - blk_start + 1); else { struct block_range *range = new_block_range(blk_start, blk_end); list->tail->next = range; list->tail = range; } } static void remove_head(struct block_range_list *list) { struct block_range *next_range = list->head->next; free(list->head); if (next_range == NULL) list->head = list->tail = NULL; else list->head = next_range; } void delete_block_ranges(struct block_range_list *list) { while (list->head) remove_head(list); } int write_block_ranges(FILE *f, struct block_range *range, char *sep) { int len; char *buf; while (range) { if (range->start == range->end) len = asprintf(&buf, "%llu%s", range->start, sep); else len = asprintf(&buf, "%llu-%llu%s", range->start, range->end, sep); if (fwrite(buf, 1, len, f) != (size_t)len) { free(buf); return -1; } free(buf); range = range->next; } len = strlen(sep); if (fseek(f, -len, SEEK_CUR) == -len) return -1; return 0; } blk64_t consume_next_block(struct block_range_list *list) { blk64_t ret = list->head->start; list->head->start += 1; if (list->head->start > list->head->end) remove_head(list); return ret; }