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1 | /* |
2 | * Copyright (c) 1987 Regents of the University of California. | |
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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. | |
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16 | */ |
17 | ||
18 | #if defined(LIBC_SCCS) && !defined(lint) | |
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19 | static char sccsid[] = "@(#)bcopy.c 5.2 (Berkeley) %G%"; |
20 | #endif /* LIBC_SCCS and not lint */ | |
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21 | |
22 | /* | |
23 | * bcopy -- vax movc3 instruction | |
24 | */ | |
25 | bcopy(src, dst, length) | |
26 | register char *src, *dst; | |
27 | register int length; | |
28 | { | |
29 | if (length && src != dst) | |
30 | if ((u_int)dst < (u_int)src) | |
31 | if (((int)src | (int)dst | length) & 3) | |
32 | do /* copy by bytes */ | |
33 | *dst++ = *src++; | |
34 | while (--length); | |
35 | else { | |
36 | length >>= 2; | |
37 | do /* copy by longs */ | |
38 | *((long *)dst)++ = *((long *)src)++; | |
39 | while (--length); | |
40 | } | |
41 | else { /* copy backwards */ | |
42 | src += length; | |
43 | dst += length; | |
44 | if (((int)src | (int)dst | length) & 3) | |
45 | do /* copy by bytes */ | |
46 | *--dst = *--src; | |
47 | while (--length); | |
48 | else { | |
49 | length >>= 2; | |
50 | do /* copy by shorts */ | |
51 | *--((long *)dst) = *--((long *)src); | |
52 | while (--length); | |
53 | } | |
54 | } | |
55 | return(0); | |
56 | } |