source: svn/newcon3bcm2_21bu/dta/src/qsort.c @ 47

/*-
 * Copyright (c) 1992, 1993
 *      The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by the University of
 *      California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * $FreeBSD: src/sys/libkern/qsort.c,v 1.10 1999/08/28 00:46:35 peter Exp $
 */

#include "ministd.h"
#define __P(x)  x
typedef int              cmp_t __P((const void *, const void *));
static __inline char    *med3 __P((char *, char *, char *, cmp_t *));
static __inline void     swapfunc __P((char *, char *, int, int));

#define min(a, b)       (a) < (b) ? a : b

/*
 * Qsort routine from Bentley & McIlroy's "Engineering a Sort Function".
 */
#define swapcode(TYPE, parmi, parmj, n) {               \
        long i = (n) / sizeof (TYPE);                   \
        register TYPE *pi = (TYPE *) (parmi);           \
        register TYPE *pj = (TYPE *) (parmj);           \
        do {                                            \
                register TYPE   t = *pi;                \
                *pi++ = *pj;                            \
                *pj++ = t;                              \
        } while (--i > 0);                              \
}

#define SWAPINIT(a, es) swaptype = ((char *)a - (char *)0) % sizeof(long) || \
        es % sizeof(long) ? 2 : es == sizeof(long)? 0 : 1;

static __inline void
swapfunc(a, b, n, swaptype)
        char *a, *b;
        int n, swaptype;
{
        if(swaptype <= 1)
                swapcode(long, a, b, n)
        else
                swapcode(char, a, b, n)
}

#define swap(a, b)                                      \
        if (swaptype == 0) {                            \
                long t = *(long *)(a);                  \
                *(long *)(a) = *(long *)(b);            \
                *(long *)(b) = t;                       \
        } else                                          \
                swapfunc(a, b, es, swaptype)

#define vecswap(a, b, n)        if ((n) > 0) swapfunc(a, b, n, swaptype)

static __inline char *
med3(a, b, c, cmp)
        char *a, *b, *c;
        cmp_t *cmp;
{
        return cmp(a, b) < 0 ?
               (cmp(b, c) < 0 ? b : (cmp(a, c) < 0 ? c : a ))
              :(cmp(b, c) > 0 ? b : (cmp(a, c) < 0 ? a : c ));
}

void
qsort(a, n, es, cmp)
        void *a;
        size_t n, es;
        cmp_t *cmp;
{
        char *pa, *pb, *pc, *pd, *pl, *pm, *pn;
        int d, r, swaptype, swap_cnt;

loop:   SWAPINIT(a, es);
        swap_cnt = 0;
        if (n < 7) {
                for (pm = (char *)a + es; pm < (char *)a + n * es; pm += es)
                        for (pl = pm; pl > (char *)a && cmp(pl - es, pl) > 0;
                             pl -= es)
                                swap(pl, pl - es);
                return;
        }
        pm = (char *)a + (n / 2) * es;
        if (n > 7) {
                pl = a;
                pn = (char *)a + (n - 1) * es;
                if (n > 40) {
                        d = (n / 8) * es;
                        pl = med3(pl, pl + d, pl + 2 * d, cmp);
                        pm = med3(pm - d, pm, pm + d, cmp);
                        pn = med3(pn - 2 * d, pn - d, pn, cmp);
                }
                pm = med3(pl, pm, pn, cmp);
        }
        swap(a, pm);
        pa = pb = (char *)a + es;

        pc = pd = (char *)a + (n - 1) * es;
        for (;;) {
                while (pb <= pc && (r = cmp(pb, a)) <= 0) {
                        if (r == 0) {
                                swap_cnt = 1;
                                swap(pa, pb);
                                pa += es;
                        }
                        pb += es;
                }
                while (pb <= pc && (r = cmp(pc, a)) >= 0) {
                        if (r == 0) {
                                swap_cnt = 1;
                                swap(pc, pd);
                                pd -= es;
                        }
                        pc -= es;
                }
                if (pb > pc)
                        break;
                swap(pb, pc);
                swap_cnt = 1;
                pb += es;
                pc -= es;
        }
        if (swap_cnt == 0) {  /* Switch to insertion sort */
                for (pm = (char *)a + es; pm < (char *)a + n * es; pm += es)
                        for (pl = pm; pl > (char *)a && cmp(pl - es, pl) > 0;
                             pl -= es)
                                swap(pl, pl - es);
                return;
        }

        pn = (char *)a + n * es;
        r = min(pa - (char *)a, pb - pa);
        vecswap(a, pb - r, r);
        r = min(pd - pc, pn - pd - es);
        vecswap(pb, pn - r, r);
        if ((r = pb - pa) > es)
                qsort(a, r / es, es, cmp);
        if ((r = pd - pc) > es) {
                /* Iterate rather than recurse to save stack space */
                a = pn - r;
                n = r / es;
                goto loop;
        }
/*              qsort(pn - r, r / es, es, cmp);*/
}