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29967194 C |
1 | /* bcopy -- copy memory regions of arbitary length |
2 | Copyright (C) 1991 Free Software Foundation, Inc. | |
3 | ||
4 | This file is part of the libiberty library. | |
5 | Libiberty is free software; you can redistribute it and/or | |
6 | modify it under the terms of the GNU Library General Public | |
7 | License as published by the Free Software Foundation; either | |
8 | version 2 of the License, or (at your option) any later version. | |
9 | ||
10 | Libiberty is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | Library General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU Library General Public | |
16 | License along with libiberty; see the file COPYING.LIB. If | |
17 | not, write to the Free Software Foundation, Inc., 675 Mass Ave, | |
18 | Cambridge, MA 02139, USA. */ | |
19 | ||
20 | /* | |
21 | ||
22 | NAME | |
23 | ||
24 | bcopy -- copy memory regions of arbitrary length | |
25 | ||
26 | SYNOPSIS | |
27 | ||
28 | void bcopy (char *in, char *out, int length) | |
29 | ||
30 | DESCRIPTION | |
31 | ||
32 | Copy LENGTH bytes from memory region pointed to by IN to memory | |
33 | region pointed to by OUT. | |
34 | ||
35 | BUGS | |
36 | Significant speed improvements can be made in some cases by | |
37 | implementing copies of multiple bytes simultaneously, or unrolling | |
38 | the copy loop. | |
39 | ||
40 | */ | |
41 | ||
42 | void | |
43 | bcopy (src, dest, len) | |
44 | register char *src, *dest; | |
45 | int len; | |
46 | { | |
47 | if (dest < src) | |
48 | while (len--) | |
49 | *dest++ = *src++; | |
50 | else | |
51 | { | |
52 | char *lasts = src + (len-1); | |
53 | char *lastd = dest + (len-1); | |
54 | while (len--) | |
55 | *(char *)lastd-- = *(char *)lasts--; | |
56 | } | |
57 | } |