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Annotation of 42BSD/lib/libc/gen/swab.c, revision 1.1.1.1

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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