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Annotation of 43BSDTahoe/lib/libc/gen/swab.c, revision 1.1.1.1

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: }

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