97     size_t	bi_used;    // bytes written to/read from bi_buffer  member
936 	while (bi->bi_used + len_todo >= CRYPT_BUF_SIZE)  in undo_write()
938 	    size_t	n = CRYPT_BUF_SIZE - bi->bi_used;  in undo_write()
940 	    mch_memmove(bi->bi_buffer + bi->bi_used, p, n);  in undo_write()
943 	    bi->bi_used = CRYPT_BUF_SIZE;  in undo_write()
949 	    mch_memmove(bi->bi_buffer + bi->bi_used, p, len_todo);  in undo_write()
950 	    bi->bi_used += len_todo;  in undo_write()
964     if (bi->bi_buffer != NULL && bi->bi_state != NULL && bi->bi_used > 0)  in undo_flush()
968 	crypt_encode_inplace(bi->bi_state, bi->bi_buffer, bi->bi_used, FALSE);  in undo_flush()
969 	if (fwrite(bi->bi_buffer, bi->bi_used, (size_t)1, bi->bi_fp) != 1)  in undo_flush()
971 	bi->bi_used = 0;  in undo_flush()
1126 	    if (bi->bi_used >= bi->bi_avail)  in undo_read()
1135 		bi->bi_used = 0;  in undo_read()
1139 	    if (n > bi->bi_avail - bi->bi_used)  in undo_read()
1140 		n = bi->bi_avail - bi->bi_used;  in undo_read()
1141 	    mch_memmove(p, bi->bi_buffer + bi->bi_used, n);  in undo_read()
1142 	    bi->bi_used += n;  in undo_read()
1235 	    bi->bi_used = 0;  in serialize_header()
1950 	    bi.bi_used = 0;  in u_read_undo()