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Annotation of kernel/machdep/ppc/libc/memmove.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
        !             3:  *
        !             4:  * @APPLE_LICENSE_HEADER_START@
        !             5:  * 
        !             6:  * Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
        !             7:  * Reserved.  This file contains Original Code and/or Modifications of
        !             8:  * Original Code as defined in and that are subject to the Apple Public
        !             9:  * Source License Version 1.1 (the "License").  You may not use this file
        !            10:  * except in compliance with the License.  Please obtain a copy of the
        !            11:  * License at http://www.apple.com/publicsource and read it before using
        !            12:  * this file.
        !            13:  * 
        !            14:  * The Original Code and all software distributed under the License are
        !            15:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
        !            16:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
        !            17:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
        !            18:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
        !            19:  * License for the specific language governing rights and limitations
        !            20:  * under the License.
        !            21:  * 
        !            22:  * @APPLE_LICENSE_HEADER_END@
        !            23:  */
        !            24: 
        !            25: /*
        !            26:  * Copyright (c) 1991,1993,1998 Apple Computer, Inc. All rights reserved.
        !            27:  * 
        !            28:  *     File:   machdep/ppc/libc/memmove.c
        !            29:  *     History:
        !            30:  *
        !            31:  */
        !            32: 
        !            33: #include <ppc/bcopy.h>
        !            34: 
        !            35: #if    ORG_BCOPY
        !            36: #if USE_FAST_BCOPY
        !            37: extern void fast_bcopy(const char *src, char *dst, unsigned int ulen);
        !            38: #endif
        !            39: #endif /* ORG_BCOPY */
        !            40: 
        !            41: #if    ORG_BCOPY
        !            42: void bcopy(const char *src, char *dst, unsigned int ulen)
        !            43: #else  /* ORG_BCOPY */
        !            44: void tjm_bcopy(const char *src, char *dst, unsigned int ulen)
        !            45: #endif /* ORG_BCOPY */
        !            46: {
        !            47:        if (ulen < 0)
        !            48:                return;
        !            49:                
        !            50:        if (src > dst || dst > src + ulen) {
        !            51: #if USE_FAST_BCOPY
        !            52:                fast_bcopy(src, dst, ulen);
        !            53: #else
        !            54:                while (ulen-- > 0) 
        !            55:                        *dst++ = *src++;
        !            56: #endif /* USE_FAST_BCOPY */
        !            57:        }
        !            58:        else {
        !            59:                dst += (ulen - 1);
        !            60:                src += (ulen - 1);
        !            61:                while (ulen-- > 0)
        !            62:                        *dst-- = *src--;
        !            63:        }
        !            64:        return;
        !            65: }
        !            66: 
        !            67: void ovbcopy(const char *src, char *dst, unsigned int ulen)
        !            68: {
        !            69:        bcopy(src, dst, ulen);
        !            70: }
        !            71: 
        !            72: #if USE_FAST_BCOPY
        !            73: #else
        !            74: void *memcpy(void *dst, const void *src, unsigned int ulen)
        !            75: {
        !            76:        bcopy(src, dst, ulen);
        !            77:        return dst;
        !            78: }
        !            79: #endif
        !            80: 
        !            81: void *memmove(void *dst, const void *src, unsigned int ulen)
        !            82: {
        !            83:        bcopy(src, dst, ulen);
        !            84:        return dst;
        !            85: }
        !            86: 
        !            87: 

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