| 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 | } |