217 		if ((in.db = malloc(out.dbsz + in.dbsz - 1)) == NULL) {  in setup()
223 	    malloc((u_int)(MAX(in.dbsz, cbsz) + cbsz))) == NULL ||  in setup()
224 	    (out.db = malloc((u_int)(out.dbsz + cbsz))) == NULL) {  in setup()
242 		(void)ftruncate(out.fd, (off_t)out.offset * out.dbsz);  in setup()
316 				(void)memset(in.dbp, ' ', in.dbsz);  in dd_in()
318 				(void)memset(in.dbp, 0, in.dbsz);  in dd_in()
321 		n = read(in.fd, in.dbp, in.dbsz);  in dd_in()
349 			    lseek(in.fd, (off_t)in.dbsz, SEEK_CUR))  in dd_in()
358 			in.dbcnt += in.dbrcnt = in.dbsz;  in dd_in()
362 		} else if (n == in.dbsz) {  in dd_in()
370 				in.dbcnt += in.dbrcnt = in.dbsz;  in dd_in()
415 	if (ddflags & C_OSYNC && out.dbcnt < out.dbsz) {  in dd_close()
416 		(void)memset(out.dbp, 0, out.dbsz - out.dbcnt);  in dd_close()
417 		out.dbcnt = out.dbsz;  in dd_close()
423 		memset(out.db, 0, out.dbsz);  in dd_close()
424 		out.dbcnt = out.dbsz;  in dd_close()
426 		pending -= out.dbsz;  in dd_close()
474 	for (n = force ? out.dbcnt : out.dbsz;; n = out.dbsz) {  in dd_out()
520 				st.sparse += pending/out.dbsz;  in dd_out()
521 				st.out_full += pending/out.dbsz;  in dd_out()
527 				if (n != out.dbsz)  in dd_out()
549 		if ((out.dbcnt -= n) < out.dbsz)  in dd_out()
594 		    (off_t)in.offset * (off_t)in.dbsz, SEEK_CUR) == -1) {  in pos_in()
609 	for (bcnt = in.dbsz, cnt = in.offset, warned = 0; cnt;) {  in pos_in()
613 					bcnt = in.dbsz;  in pos_in()
665 		    (off_t)out.offset * (off_t)out.dbsz, SEEK_SET) == -1) {  in pos_out()
688 		if ((n = read(out.fd, out.db, out.dbsz)) > 0)  in pos_out()
712 			if ((n = bwrite(out.fd, out.db, out.dbsz)) != out.dbsz) {  in pos_out()
744 	if (in.dbcnt >= out.dbsz) {  in def()
865 		if ((out.dbcnt += cbsz) >= out.dbsz)  in block()
926 		if (out.dbcnt >= out.dbsz)  in unblock()
1060 	in.dbsz = out.dbsz = 512;  in jcl()
1172 	in.dbsz = out.dbsz = strsuftoll("block size", arg, 1, UINT_MAX);  in f_bs()
1205 		in.dbsz = strsuftoll("input block size", arg, 1, UINT_MAX);  in f_ibs()
1220 		out.dbsz = strsuftoll("output block size", arg, 1, UINT_MAX);  in f_obs()