1 /* 2 * Copyright (c) 1986 Regents of the University of California. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms are permitted 6 * provided that the above copyright notice and this paragraph are 7 * duplicated in all such forms and that any documentation, 8 * advertising materials, and other materials related to such 9 * distribution and use acknowledge that the software was developed 10 * by the University of California, Berkeley. The name of the 11 * University may not be used to endorse or promote products derived 12 * from this software without specific prior written permission. 13 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR 14 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED 15 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. 16 */ 17 18 #ifndef lint 19 char copyright[] = 20 "@(#) Copyright (c) 1986 Regents of the University of California.\n\ 21 All rights reserved.\n"; 22 #endif /* not lint */ 23 24 #ifndef lint 25 static char sccsid[] = "@(#)20b.c 5.5 (Berkeley) 06/29/88"; 26 #endif /* not lint */ 27 28 #include <stdio.h> 29 30 main(argc, argv) 31 int argc; 32 char **argv; 33 { 34 register int bsize, cc, want; 35 register char *base, *current; 36 char *alloca(); 37 38 if (argc > 1) { 39 bsize = atoi(argv[1]); 40 if (bsize <= 0) { 41 fputs("20b: bad block size.\n", stderr); 42 exit(-1); 43 } 44 } 45 else 46 bsize = 20 * 512; 47 base = alloca(bsize); 48 for (cc = bsize; cc > 0;) { 49 current = base; 50 for (want = bsize; want > 0 && cc > 0; want -= cc) { 51 if ((cc = read(0, current, want)) < 0) 52 return(-1); 53 current += cc; 54 } 55 want = bsize - want; 56 if (want && write(1, base, want) != want) 57 return(-1); 58 } 59 return(0); 60 } 61