| 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) %G%"; |
| 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 | } |