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Annotation of GNUtools/libg++/libiberty/bcopy.c, revision 1.1

1.1     ! root        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: }

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