Return to swab.c CVS log

Up to [CSRG BSD Unix] / 43BSDTahoe / lib / libc / gen

Annotation of 43BSDTahoe/lib/libc/gen/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:  * Redistribution and use in source and binary forms are permitted
        !             6:  * provided that the above copyright notice and this paragraph are
        !             7:  * duplicated in all such forms and that any documentation,
        !             8:  * advertising materials, and other materials related to such
        !             9:  * distribution and use acknowledge that the software was developed
        !            10:  * by the University of California, Berkeley.  The name of the
        !            11:  * University may not be used to endorse or promote products derived
        !            12:  * from this software without specific prior written permission.
        !            13:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
        !            14:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
        !            15:  * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            16:  */
        !            17: 
        !            18: #if defined(LIBC_SCCS) && !defined(lint)
        !            19: static char sccsid[] = "@(#)swab.c     5.4 (Berkeley) 6/27/88";
        !            20: #endif /* LIBC_SCCS and not lint */
        !            21: 
        !            22: /*
        !            23:  * Swab bytes
        !            24:  * Jeffrey Mogul, Stanford
        !            25:  */
        !            26: 
        !            27: swab(from, to, n)
        !            28:        register char *from, *to;
        !            29:        register int n;
        !            30: {
        !            31:        register unsigned long temp;
        !            32: 
        !            33:        n >>= 1; n++;
        !            34: #define        STEP    temp = *from++,*to++ = *from++,*to++ = temp
        !            35:        /* round to multiple of 8 */
        !            36:        while ((--n) & 07)
        !            37:                STEP;
        !            38:        n >>= 3;
        !            39:        while (--n >= 0) {
        !            40:                STEP; STEP; STEP; STEP;
        !            41:                STEP; STEP; STEP; STEP;
        !            42:        }
        !            43: }

This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.