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Annotation of 42BSD/lib/libc/gen/swab.c, revision 1.1

1.1     ! root        1: /*     swab.c  4.2     83/06/27        */
        !             2: 
        !             3: /*
        !             4:  * Swab bytes
        !             5:  * Jeffrey Mogul, Stanford
        !             6:  */
        !             7: 
        !             8: swab(from, to, n)
        !             9:        register char *from, *to;
        !            10:        register int n;
        !            11: {
        !            12:        register unsigned long temp;
        !            13:        
        !            14:        n >>= 1; n++;
        !            15: #define        STEP    temp = *from++,*to++ = *from++,*to++ = temp
        !            16:        /* round to multiple of 8 */
        !            17:        while ((--n) & 07)
        !            18:                STEP;
        !            19:        n >>= 3;
        !            20:        while (--n >= 0) {
        !            21:                STEP; STEP; STEP; STEP;
        !            22:                STEP; STEP; STEP; STEP;
        !            23:        }
        !            24: }

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