freebsd-skq/lib/libc/stdlib/qsort.c

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/*-
* SPDX-License-Identifier: BSD-3-Clause
*
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* 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. Neither the name of the University nor the names of its contributors
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* 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.
*/
#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)qsort.c 8.1 (Berkeley) 6/4/93";
#endif /* LIBC_SCCS and not lint */
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
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#include <stdlib.h>
#ifdef I_AM_QSORT_R
typedef int cmp_t(void *, const void *, const void *);
#else
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typedef int cmp_t(const void *, const void *);
#endif
static inline char *med3(char *, char *, char *, cmp_t *, void *);
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#define MIN(a, b) ((a) < (b) ? a : b)
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/*
* Qsort routine from Bentley & McIlroy's "Engineering a Sort Function".
*/
static inline void
swapfunc(char *a, char *b, size_t es)
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{
char t;
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do {
t = *a;
*a++ = *b;
*b++ = t;
} while (--es > 0);
}
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#define vecswap(a, b, n) \
if ((n) > 0) swapfunc(a, b, n)
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#ifdef I_AM_QSORT_R
#define CMP(t, x, y) (cmp((t), (x), (y)))
#else
#define CMP(t, x, y) (cmp((x), (y)))
#endif
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static inline char *
med3(char *a, char *b, char *c, cmp_t *cmp, void *thunk
#ifndef I_AM_QSORT_R
__unused
#endif
)
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{
return CMP(thunk, a, b) < 0 ?
(CMP(thunk, b, c) < 0 ? b : (CMP(thunk, a, c) < 0 ? c : a ))
:(CMP(thunk, b, c) > 0 ? b : (CMP(thunk, a, c) < 0 ? a : c ));
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}
#ifdef I_AM_QSORT_R
void
qsort_r(void *a, size_t n, size_t es, void *thunk, cmp_t *cmp)
#else
#define thunk NULL
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void
qsort(void *a, size_t n, size_t es, cmp_t *cmp)
#endif
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{
char *pa, *pb, *pc, *pd, *pl, *pm, *pn;
size_t d1, d2;
int cmp_result;
int swap_cnt;
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loop:
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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(thunk, pl - es, pl) > 0;
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pl -= es)
swapfunc(pl, pl - es, es);
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return;
}
pm = (char *)a + (n / 2) * es;
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if (n > 7) {
pl = a;
pn = (char *)a + (n - 1) * es;
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if (n > 40) {
size_t d = (n / 8) * es;
pl = med3(pl, pl + d, pl + 2 * d, cmp, thunk);
pm = med3(pm - d, pm, pm + d, cmp, thunk);
pn = med3(pn - 2 * d, pn - d, pn, cmp, thunk);
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}
pm = med3(pl, pm, pn, cmp, thunk);
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}
swapfunc(a, pm, es);
pa = pb = (char *)a + es;
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pc = pd = (char *)a + (n - 1) * es;
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for (;;) {
while (pb <= pc && (cmp_result = CMP(thunk, pb, a)) <= 0) {
if (cmp_result == 0) {
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swap_cnt = 1;
swapfunc(pa, pb, es);
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pa += es;
}
pb += es;
}
while (pb <= pc && (cmp_result = CMP(thunk, pc, a)) >= 0) {
if (cmp_result == 0) {
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swap_cnt = 1;
swapfunc(pc, pd, es);
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pd -= es;
}
pc -= es;
}
if (pb > pc)
break;
swapfunc(pb, pc, es);
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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(thunk, pl - es, pl) > 0;
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pl -= es)
swapfunc(pl, pl - es, es);
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return;
}
pn = (char *)a + n * es;
d1 = MIN(pa - (char *)a, pb - pa);
vecswap(a, pb - d1, d1);
d1 = MIN(pd - pc, pn - pd - es);
vecswap(pb, pn - d1, d1);
d1 = pb - pa;
d2 = pd - pc;
if (d1 <= d2) {
/* Recurse on left partition, then iterate on right partition */
if (d1 > es) {
#ifdef I_AM_QSORT_R
qsort_r(a, d1 / es, es, thunk, cmp);
#else
qsort(a, d1 / es, es, cmp);
#endif
}
if (d2 > es) {
/* Iterate rather than recurse to save stack space */
/* qsort(pn - d2, d2 / es, es, cmp); */
a = pn - d2;
n = d2 / es;
goto loop;
}
} else {
/* Recurse on right partition, then iterate on left partition */
if (d2 > es) {
#ifdef I_AM_QSORT_R
qsort_r(pn - d2, d2 / es, es, thunk, cmp);
#else
qsort(pn - d2, d2 / es, es, cmp);
#endif
}
if (d1 > es) {
/* Iterate rather than recurse to save stack space */
/* qsort(a, d1 / es, es, cmp); */
n = d1 / es;
goto loop;
}
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}
}