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1 | /* |
2 | * Copyright (c) 1987 Regents of the University of California. | |
acca4551 KB |
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. | |
dba1d438 KM |
16 | */ |
17 | ||
18 | #if defined(LIBC_SCCS) && !defined(lint) | |
68b48ece | 19 | static char sccsid[] = "@(#)bcopy.c 5.4 (Berkeley) %G%"; |
acca4551 | 20 | #endif /* LIBC_SCCS and not lint */ |
dba1d438 | 21 | |
a5190670 KB |
22 | #include <sys/types.h> |
23 | ||
dba1d438 KM |
24 | /* |
25 | * bcopy -- vax movc3 instruction | |
26 | */ | |
27 | bcopy(src, dst, length) | |
a5190670 | 28 | register long *src, *dst; |
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29 | register int length; |
30 | { | |
31 | if (length && src != dst) | |
32 | if ((u_int)dst < (u_int)src) | |
33 | if (((int)src | (int)dst | length) & 3) | |
34 | do /* copy by bytes */ | |
35 | *dst++ = *src++; | |
36 | while (--length); | |
37 | else { | |
38 | length >>= 2; | |
39 | do /* copy by longs */ | |
40 | *((long *)dst)++ = *((long *)src)++; | |
41 | while (--length); | |
42 | } | |
43 | else { /* copy backwards */ | |
44 | src += length; | |
45 | dst += length; | |
46 | if (((int)src | (int)dst | length) & 3) | |
47 | do /* copy by bytes */ | |
48 | *--dst = *--src; | |
49 | while (--length); | |
50 | else { | |
51 | length >>= 2; | |
52 | do /* copy by shorts */ | |
53 | *--((long *)dst) = *--((long *)src); | |
54 | while (--length); | |
55 | } | |
56 | } | |
dba1d438 | 57 | } |