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Annotation of 43BSDReno/lib/libc/string/swab.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1988 Regents of the University of California.
        !             3:  * All rights reserved.
        !             4:  *
        !             5:  * This code is derived from software contributed to Berkeley by
        !             6:  * Jeffrey Mogul.
        !             7:  *
        !             8:  * Redistribution and use in source and binary forms are permitted provided
        !             9:  * that: (1) source distributions retain this entire copyright notice and
        !            10:  * comment, and (2) distributions including binaries display the following
        !            11:  * acknowledgement:  ``This product includes software developed by the
        !            12:  * University of California, Berkeley and its contributors'' in the
        !            13:  * documentation or other materials provided with the distribution and in
        !            14:  * all advertising materials mentioning features or use of this software.
        !            15:  * Neither the name of the University nor the names of its contributors may
        !            16:  * be used to endorse or promote products derived from this software without
        !            17:  * specific prior written permission.
        !            18:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
        !            19:  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
        !            20:  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            21:  */
        !            22: 
        !            23: #if defined(LIBC_SCCS) && !defined(lint)
        !            24: static char sccsid[] = "@(#)swab.c     5.8 (Berkeley) 6/27/90";
        !            25: #endif /* LIBC_SCCS and not lint */
        !            26: 
        !            27: #include <string.h>
        !            28: 
        !            29: void
        !            30: swab(from, to, n)
        !            31:        register char *from, *to;
        !            32:        register int n;
        !            33: {
        !            34:        register unsigned long temp;
        !            35: 
        !            36:        n >>= 1; n++;
        !            37: #define        STEP    temp = *from++,*to++ = *from++,*to++ = temp
        !            38:        /* round to multiple of 8 */
        !            39:        while ((--n) & 07)
        !            40:                STEP;
        !            41:        n >>= 3;
        !            42:        while (--n >= 0) {
        !            43:                STEP; STEP; STEP; STEP;
        !            44:                STEP; STEP; STEP; STEP;
        !            45:        }
        !            46: }

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