static int vmdk_parent_open(BlockDriverState *bs) { char *p_name; char desc[DESC_SIZE + 1]; BDRVVmdkState *s = bs->opaque; desc[DESC_SIZE] = '\0'; if (bdrv_pread(bs->file, s->desc_offset, desc, DESC_SIZE) != DESC_SIZE) { return -1; } if ((p_name = strstr(desc,"parentFileNameHint")) != NULL) { char *end_name; p_name += sizeof("parentFileNameHint") + 1; if ((end_name = strchr(p_name,'\"')) == NULL) return -1; if ((end_name - p_name) > sizeof (bs->backing_file) - 1) return -1; pstrcpy(bs->backing_file, end_name - p_name + 1, p_name); } return 0; }