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https://github.com/classilla/tenfourfox.git
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188 lines
5.1 KiB
C++
188 lines
5.1 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/*-
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* Copyright (c) 1992, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 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
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/* We need this because Solaris' version of qsort is broken and
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* causes array bounds reads.
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*/
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#include <stdlib.h>
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#include "nsAlgorithm.h"
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#include "nsQuickSort.h"
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extern "C" {
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#if !defined(DEBUG) && (defined(__cplusplus) || defined(__gcc))
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# ifndef INLINE
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# define INLINE inline
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# endif
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#else
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# define INLINE
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#endif
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typedef int cmp_t(const void *, const void *, void *);
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static INLINE char *med3(char *, char *, char *, cmp_t *, void *);
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static INLINE void swapfunc(char *, char *, int, int);
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/*
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* Qsort routine from Bentley & McIlroy's "Engineering a Sort Function".
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*/
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#define swapcode(TYPE, parmi, parmj, n) { \
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long i = (n) / sizeof (TYPE); \
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TYPE *pi = (TYPE *) (parmi); \
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TYPE *pj = (TYPE *) (parmj); \
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do { \
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TYPE t = *pi; \
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*pi++ = *pj; \
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*pj++ = t; \
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} while (--i > 0); \
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}
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#define SWAPINIT(a, es) swaptype = ((char *)a - (char *)0) % sizeof(long) || \
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es % sizeof(long) ? 2 : es == sizeof(long)? 0 : 1;
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static INLINE void
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swapfunc(char *a, char *b, int n, int swaptype)
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{
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if(swaptype <= 1)
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swapcode(long, a, b, n)
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else
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swapcode(char, a, b, n)
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}
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#define swap(a, b) \
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if (swaptype == 0) { \
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long t = *(long *)(a); \
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*(long *)(a) = *(long *)(b); \
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*(long *)(b) = t; \
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} else \
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swapfunc((char *)a, (char*)b, (int)es, swaptype)
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#define vecswap(a, b, n) if ((n) > 0) swapfunc((char *)a, (char *)b, (int)n, swaptype)
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static INLINE char *
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med3(char *a, char *b, char *c, cmp_t* cmp, void *data)
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{
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return cmp(a, b, data) < 0 ?
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(cmp(b, c, data) < 0 ? b : (cmp(a, c, data) < 0 ? c : a ))
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:(cmp(b, c, data) > 0 ? b : (cmp(a, c, data) < 0 ? a : c ));
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}
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void NS_QuickSort (
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void *a,
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unsigned int n,
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unsigned int es,
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cmp_t *cmp,
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void *data
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)
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{
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char *pa, *pb, *pc, *pd, *pl, *pm, *pn;
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int d, r, swaptype;
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loop: SWAPINIT(a, es);
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/* Use insertion sort when input is small */
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if (n < 7) {
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for (pm = (char *)a + es; pm < (char *)a + n * es; pm += es)
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for (pl = pm; pl > (char *)a && cmp(pl - es, pl, data) > 0;
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pl -= es)
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swap(pl, pl - es);
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return;
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}
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/* Choose pivot */
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pm = (char *)a + (n / 2) * es;
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if (n > 7) {
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pl = (char *)a;
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pn = (char *)a + (n - 1) * es;
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if (n > 40) {
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d = (n / 8) * es;
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pl = med3(pl, pl + d, pl + 2 * d, cmp, data);
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pm = med3(pm - d, pm, pm + d, cmp, data);
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pn = med3(pn - 2 * d, pn - d, pn, cmp, data);
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}
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pm = med3(pl, pm, pn, cmp, data);
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}
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swap(a, pm);
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pa = pb = (char *)a + es;
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pc = pd = (char *)a + (n - 1) * es;
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/* loop invariants:
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* [a, pa) = pivot
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* [pa, pb) < pivot
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* [pb, pc + es) unprocessed
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* [pc + es, pd + es) > pivot
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* [pd + es, pn) = pivot
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*/
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for (;;) {
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while (pb <= pc && (r = cmp(pb, a, data)) <= 0) {
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if (r == 0) {
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swap(pa, pb);
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pa += es;
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}
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pb += es;
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}
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while (pb <= pc && (r = cmp(pc, a, data)) >= 0) {
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if (r == 0) {
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swap(pc, pd);
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pd -= es;
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}
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pc -= es;
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}
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if (pb > pc)
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break;
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swap(pb, pc);
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pb += es;
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pc -= es;
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}
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/* Move pivot values */
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pn = (char *)a + n * es;
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r = XPCOM_MIN(pa - (char *)a, pb - pa);
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vecswap(a, pb - r, r);
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r = XPCOM_MIN<size_t>(pd - pc, pn - pd - es);
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vecswap(pb, pn - r, r);
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/* Recursively process partitioned items */
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if ((r = pb - pa) > (int)es)
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NS_QuickSort(a, r / es, es, cmp, data);
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if ((r = pd - pc) > (int)es) {
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/* Iterate rather than recurse to save stack space */
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a = pn - r;
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n = r / es;
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goto loop;
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}
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/* NS_QuickSort(pn - r, r / es, es, cmp, data);*/
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}
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}
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#undef INLINE
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#undef swapcode
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#undef SWAPINIT
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#undef swap
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#undef vecswap
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