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Annotation of prex-old/usr/lib/libc/string/bcopy.c, Revision 1.1

1.1     ! nbrk        1: /*-
        !             2:  * Copyright (c) 1990, 1993
        !             3:  *     The Regents of the University of California.  All rights reserved.
        !             4:  *
        !             5:  * This code is derived from software contributed to Berkeley by
        !             6:  * Chris Torek.
        !             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:
        !            33: #include <sys/cdefs.h>
        !            34: #include <string.h>
        !            35:
        !            36: /*
        !            37:  * Copy a block of memory, handling overlap.
        !            38:  * This is the routine that actually implements
        !            39:  * (the portable versions of) bcopy, memcpy, and memmove.
        !            40:  */
        !            41: #ifdef MEMCOPY
        !            42: void *
        !            43: memcpy(dst0, src0, length)
        !            44: #else
        !            45: #ifdef MEMMOVE
        !            46: void *
        !            47: memmove(dst0, src0, length)
        !            48: #else
        !            49: void
        !            50: bcopy(src0, dst0, length)
        !            51: #endif
        !            52: #endif
        !            53:        void *dst0;
        !            54:        const void *src0;
        !            55:        size_t length;
        !            56: {
        !            57:        char *dst = dst0;
        !            58:        const char *src = src0;
        !            59:
        !            60:        if (length == 0 || dst == src)          /* nothing to do */
        !            61:                goto done;
        !            62:
        !            63:        if (((unsigned long)dst < (unsigned long)src) &&
        !            64:            ((unsigned long)dst < (unsigned long)src + length)) {
        !            65:                /* Copy backwards. */
        !            66:                src += length;
        !            67:                dst += length;
        !            68:                while (length--) {
        !            69:                        *--dst = *--src;
        !            70:                }
        !            71:        } else {
        !            72:                while (length--) {
        !            73:                        *dst++ = *src++;
        !            74:                }
        !            75:        }
        !            76: done:
        !            77: #if defined(MEMCOPY) || defined(MEMMOVE)
        !            78:        return (dst0);
        !            79: #else
        !            80:        return;
        !            81: #endif
        !            82: }