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

1.1       root        1: #if defined(LIBC_SCCS) && !defined(lint)
                      2: static char sccsid[] = "@(#)swab.c     5.3 (Berkeley) 3/9/86";
                      3: #endif LIBC_SCCS and not lint
                      4: 
                      5: /*
                      6:  * Swab bytes
                      7:  * Jeffrey Mogul, Stanford
                      8:  */
                      9: 
                     10: swab(from, to, n)
                     11:        register char *from, *to;
                     12:        register int n;
                     13: {
                     14:        register unsigned long temp;
                     15:        
                     16:        n >>= 1; n++;
                     17: #define        STEP    temp = *from++,*to++ = *from++,*to++ = temp
                     18:        /* round to multiple of 8 */
                     19:        while ((--n) & 07)
                     20:                STEP;
                     21:        n >>= 3;
                     22:        while (--n >= 0) {
                     23:                STEP; STEP; STEP; STEP;
                     24:                STEP; STEP; STEP; STEP;
                     25:        }
                     26: }

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