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Annotation of sys/lib/libkern/arch/powerpc/memcpy.c, Revision 1.1.1.1

1.1       nbrk        1: /*     $OpenBSD: memcpy.c,v 1.2 2003/06/02 23:28:08 millert Exp $      */
                      2: /*     $NetBSD: bcopy.c,v 1.5 1995/04/22 13:46:50 cgd Exp $    */
                      3:
                      4: /*-
                      5:  * Copyright (c) 1993
                      6:  *     The Regents of the University of California.  All rights reserved.
                      7:  *
                      8:  * Redistribution and use in source and binary forms, with or without
                      9:  * modification, are permitted provided that the following conditions
                     10:  * are met:
                     11:  * 1. Redistributions of source code must retain the above copyright
                     12:  *    notice, this list of conditions and the following disclaimer.
                     13:  * 2. Redistributions in binary form must reproduce the above copyright
                     14:  *    notice, this list of conditions and the following disclaimer in the
                     15:  *    documentation and/or other materials provided with the distribution.
                     16:  * 3. Neither the name of the University nor the names of its contributors
                     17:  *    may be used to endorse or promote products derived from this software
                     18:  *    without specific prior written permission.
                     19:  *
                     20:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     21:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     22:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     23:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     24:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     25:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     26:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     27:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     28:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     29:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     30:  * SUCH DAMAGE.
                     31:  *
                     32:  *     @(#)bcopy.c     8.1 (Berkeley) 6/11/93
                     33:  */
                     34:
                     35: #include <sys/types.h>
                     36:
                     37: /*
                     38:  * This is designed to be small, not fast.
                     39:  */
                     40: void *
                     41: memcpy(s1, s2, n)
                     42:        void *s1;
                     43:        const void *s2;
                     44:        size_t n;
                     45: {
                     46:        register const char *f = s2;
                     47:        register char *t = s1;
                     48:
                     49:        if (f < t) {
                     50:                f += n;
                     51:                t += n;
                     52:                while (n-- > 0)
                     53:                        *--t = *--f;
                     54:        } else
                     55:                while (n-- > 0)
                     56:                        *t++ = *f++;
                     57:        return s1;
                     58: }