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Annotation of coherent/d/usr/lib/libcurses/bcopy.c, revision 1.1

1.1     ! root        1: /* $Header: /usr/src/lib/libcurses/RCS/bcopy.c,v 1.1 89/04/07 13:20:34 src Exp $
        !             2:  *
        !             3:  *     The  information  contained herein  is a trade secret  of INETCO
        !             4:  *     Systems, and is confidential information.   It is provided under
        !             5:  *     a license agreement,  and may be copied or disclosed  only under
        !             6:  *     the terms of that agreement.   Any reproduction or disclosure of
        !             7:  *     this  material  without  the express  written  authorization  of
        !             8:  *     INETCO Systems or persuant to the license agreement is unlawful.
        !             9:  *
        !            10:  *     Copyright (c) 1989
        !            11:  *     An unpublished work by INETCO Systems, Ltd.
        !            12:  *     All rights reserved.
        !            13:  */
        !            14: 
        !            15: /**
        !            16:  *
        !            17:  * void
        !            18:  * bcopy( src, dst, len )              -- byte copy routine (Berkeley)
        !            19:  * char * src, *dst;
        !            20:  * int len;
        !            21:  *
        !            22:  *     Input:  src = source location.
        !            23:  *             dst = destination location.
        !            24:  *             len = number of bytes to be transferred.
        !            25:  *
        !            26:  *     Action: Copy 'len' bytes from location 'src' to location 'dst'.
        !            27:  *
        !            28:  *     Return: None.
        !            29:  *
        !            30:  *     Notes:  The 'bcopy' routine takes parameters backwards from
        !            31:  *             the 'strcpy' and 'memcpy' routines.
        !            32:  */
        !            33: 
        !            34: void
        !            35: bcopy( src, dst, len )
        !            36: register char * src, *dst;
        !            37: int len;
        !            38: {
        !            39:        /*
        !            40:         * Copy right to left in case insertion is taking place.
        !            41:         */
        !            42:        if ( dst > src ) {
        !            43: 
        !            44:                /*
        !            45:                 * Advance just past the end of source/destination buffers.
        !            46:                 */
        !            47:                dst += len;
        !            48:                src += len;
        !            49: 
        !            50:                /*
        !            51:                 * Copy right to left.
        !            52:                 */
        !            53:                while ( --len >= 0 )
        !            54:                        *--dst = *--src;
        !            55:        }
        !            56: 
        !            57:        /*
        !            58:         * Copy left to right.
        !            59:         */
        !            60:        else {
        !            61:                for ( ; --len >= 0; src++, dst++ )
        !            62:                        *dst = *src;
        !            63:        }
        !            64: }

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