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Annotation of GNUtools/libg++/libiberty/bcopy.c, revision 1.1.1.1

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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