575 lines
16 KiB
C++
575 lines
16 KiB
C++
#include "sort.h"
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#include "Mem.h"
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#include "Sanity.h"
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#include <stdlib.h>
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#include <string.h>
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/* $OpenBSD: qsort.c,v 1.10 2005/08/08 08:05:37 espie Exp $ */
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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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// JAB: duplicate includes
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//#include <sys/types.h>
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//#include <stdlib.h>
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static __inline char *med3(char *, char *, char *, int (*)(const void *, const void *));
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static __inline void swapfunc(char *, char *, int, int);
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#define min(a, b) (a) < (b) ? a : b
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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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int32_t 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(int32_t) || \
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es % sizeof(int32_t) ? 2 : es == sizeof(int32_t)? 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(int32_t, 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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// JAB: namespace collision with mergesort
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//#define swap(a, b)
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#define qsort_swap(a, b) \
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if (swaptype == 0) { \
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int32_t t = *(int32_t *)(a); \
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*(int32_t *)(a) = *(int32_t *)(b); \
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*(int32_t *)(b) = t; \
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} else \
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swapfunc(a, b, es, swaptype)
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#define vecswap(a, b, n) if ((n) > 0) swapfunc(a, b, n, swaptype)
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static __inline char *
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med3(char *a, char *b, char *c, int (*cmp)(const void *, const void *))
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{
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return cmp(a, b) < 0 ?
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(cmp(b, c) < 0 ? b : (cmp(a, c) < 0 ? c : a ))
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:(cmp(b, c) > 0 ? b : (cmp(a, c) < 0 ? a : c ));
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}
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void
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// JAB: avoid namespace collision with stdlib
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//qsort(void *aa, size_t n, size_t es, int (*cmp)(const void *, const void *))
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gbqsort( void* aa,
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size_t n,
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size_t es,
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int (*cmp)(const void *, const void *))
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{
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char *pa, *pb, *pc, *pd, *pl, *pm, *pn;
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int d, r, swaptype, swap_cnt;
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// JAB: cast required
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//char *a = aa;
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char *a = (char*) aa;
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// JAB: short-circuit if no action required
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if (n < 1) {
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return;
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}
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loop: SWAPINIT(a, es);
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swap_cnt = 0;
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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) > 0;
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pl -= es)
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qsort_swap(pl, pl - es);
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return;
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}
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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);
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pm = med3(pm - d, pm, pm + d, cmp);
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pn = med3(pn - 2 * d, pn - d, pn, cmp);
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}
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pm = med3(pl, pm, pn, cmp);
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}
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qsort_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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for (;;) {
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while (pb <= pc && (r = cmp(pb, a)) <= 0) {
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if (r == 0) {
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swap_cnt = 1;
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qsort_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)) >= 0) {
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if (r == 0) {
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swap_cnt = 1;
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qsort_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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qsort_swap(pb, pc);
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swap_cnt = 1;
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pb += es;
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pc -= es;
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}
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if (swap_cnt == 0) { /* Switch to insertion sort */
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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) > 0;
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pl -= es)
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qsort_swap(pl, pl - es);
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return;
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}
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pn = (char *)a + n * es;
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r = min(pa - (char *)a, pb - pa);
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vecswap(a, pb - r, r);
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// JAB: cast required
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//r = min(pd - pc, pn - pd - es);
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r = min((int) (pd - pc), (int) (pn - pd - es));
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vecswap(pb, pn - r, r);
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// JAB: cast required
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//if ((r = pb - pa) > es)
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if ((r = pb - pa) > (int) es)
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qsort(a, r / es, es, cmp);
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// JAB: cast required
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//if ((r = pd - pc) > es) {
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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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/* qsort(pn - r, r / es, es, cmp);*/
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}
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/* $OpenBSD: merge.c,v 1.8 2005/08/08 08:05:37 espie Exp $ */
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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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* This code is derived from software contributed to Berkeley by
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* Peter McIlroy.
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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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/*
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* Hybrid exponential search/linear search merge sort with hybrid
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* natural/pairwise first pass. Requires about .3% more comparisons
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* for random data than LSMS with pairwise first pass alone.
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* It works for objects as small as two bytes.
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*/
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#define NATURAL
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#define THRESHOLD 16 /* Best choice for natural merge cut-off. */
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/* #define NATURAL to get hybrid natural merge.
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* (The default is pairwise merging.)
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*/
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// JAB: duplicate includes
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//#include <sys/types.h>
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//#include <errno.h>
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//#include <stdlib.h>
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//#include <string.h>
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// JAB: proper typing
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//static void setup(u_char *, u_char *, size_t, size_t, int (*)());
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static void setup(u_char *, u_char *, size_t, size_t,
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int (*)(const void*, const void*));
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//static void insertionsort(u_char *, size_t, size_t, int (*)());
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static void insertionsort(u_char *, size_t, size_t,
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int (*)(const void*, const void *));
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#define ISIZE sizeof(int)
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#define PSIZE sizeof(u_char *)
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#define ICOPY_LIST(src, dst, last) \
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do \
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*(int*)dst = *(int*)src, src += ISIZE, dst += ISIZE; \
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while(src < last)
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#define ICOPY_ELT(src, dst, i) \
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do \
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*(int*) dst = *(int*) src, src += ISIZE, dst += ISIZE; \
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while (i -= ISIZE)
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#define CCOPY_LIST(src, dst, last) \
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do \
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*dst++ = *src++; \
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while (src < last)
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#define CCOPY_ELT(src, dst, i) \
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do \
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*dst++ = *src++; \
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while (i -= 1)
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/*
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* Find the next possible pointer head. (Trickery for forcing an array
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* to do double duty as a linked list when objects do not align with word
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* boundaries.
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*/
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/* Assumption: PSIZE is a power of 2. */
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#define EVAL(p) (u_char **) \
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((u_char *)0 + \
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(((u_char *)p + PSIZE - 1 - (u_char *) 0) & ~(PSIZE - 1)))
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/*
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* Arguments are as for qsort.
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*/
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// JAB: return void now
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//int
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void
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// JAB: avoid namespace collision with stdlib on certain OS platforms
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//mergesort(void *base, size_t nmemb, size_t size,
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gbmergesort( void* base,
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size_t nmemb,
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size_t size,
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int (*cmp)(const void *, const void *),
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char* bufSpace, int32_t bufSpaceSize) {
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int i, sense;
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int big, iflag;
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// JAB: track size malloc'd
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int mallocsize;
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u_char *f1, *f2, *t, *b, *tp2, *q, *l1, *l2;
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u_char *list2, *list1, *p2, *p, *last, **p1;
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if (size < PSIZE / 2) { /* Pointers must fit into 2 * size. */
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// JAB: fall back on gbqsort()
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//errno = EINVAL;
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//return (-1);
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return gbqsort(base, nmemb, size, cmp);
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}
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// JAB: zero members was causing this to CRASH!
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if (nmemb < 1) {
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return;
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}
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/*
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* XXX
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* Stupid subtraction for the Cray.
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*/
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iflag = 0;
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if (!(size % ISIZE) && !(((char *)base - (char *)0) % ISIZE))
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iflag = 1;
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// JAB: cast required
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//if ((list2 = malloc(nmemb * size + PSIZE)) == NULL)
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// JAB: convert to mmalloc
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//if ((list2 = (u_char*) malloc(nmemb * size + PSIZE)) == NULL)
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mallocsize = nmemb * size + PSIZE;
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if(bufSpace) {
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if(bufSpaceSize < mallocsize) {
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gbshutdownLogicError();
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}
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list2 = (u_char*)bufSpace;
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}
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else list2 = (u_char*) mmalloc(mallocsize, "gbmergesort");
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if (list2 == NULL) {
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// JAB: instead, fall back on gbqsort()
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//return (-1);
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return gbqsort(base, nmemb, size, cmp);
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}
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// JAB: cast required
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//list1 = base;
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list1 = (u_char*) base;
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setup(list1, list2, nmemb, size, cmp);
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last = list2 + nmemb * size;
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i = big = 0;
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while (*EVAL(list2) != last) {
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l2 = list1;
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p1 = EVAL(list1);
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for (tp2 = p2 = list2; p2 != last; p1 = EVAL(l2)) {
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p2 = *EVAL(p2);
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f1 = l2;
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f2 = l1 = list1 + (p2 - list2);
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if (p2 != last)
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p2 = *EVAL(p2);
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l2 = list1 + (p2 - list2);
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while (f1 < l1 && f2 < l2) {
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if ((*cmp)(f1, f2) <= 0) {
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q = f2;
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b = f1, t = l1;
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sense = -1;
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} else {
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q = f1;
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b = f2, t = l2;
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sense = 0;
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}
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if (!big) { /* here i = 0 */
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while ((b += size) < t && cmp(q, b) >sense)
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if (++i == 6) {
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big = 1;
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goto EXPONENTIAL;
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}
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} else {
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EXPONENTIAL: for (i = size; ; i <<= 1)
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if ((p = (b + i)) >= t) {
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if ((p = t - size) > b &&
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(*cmp)(q, p) <= sense)
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t = p;
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else
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b = p;
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break;
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} else if ((*cmp)(q, p) <= sense) {
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t = p;
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// JAB: cast required
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//if (i == size)
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if (i == (int) size)
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big = 0;
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goto FASTCASE;
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} else
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b = p;
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while (t > b+size) {
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i = (((t - b) / size) >> 1) * size;
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if ((*cmp)(q, p = b + i) <= sense)
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t = p;
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else
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b = p;
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}
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goto COPY;
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// JAB: cast required
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//FASTCASE: while (i > size)
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FASTCASE: while (i > (int) size)
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if ((*cmp)(q,
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p = b + (i >>= 1)) <= sense)
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t = p;
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else
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b = p;
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COPY: b = t;
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}
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i = size;
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if (q == f1) {
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if (iflag) {
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ICOPY_LIST(f2, tp2, b);
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ICOPY_ELT(f1, tp2, i);
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} else {
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CCOPY_LIST(f2, tp2, b);
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CCOPY_ELT(f1, tp2, i);
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}
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} else {
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if (iflag) {
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ICOPY_LIST(f1, tp2, b);
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ICOPY_ELT(f2, tp2, i);
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} else {
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CCOPY_LIST(f1, tp2, b);
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CCOPY_ELT(f2, tp2, i);
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}
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}
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}
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if (f2 < l2) {
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if (iflag)
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ICOPY_LIST(f2, tp2, l2);
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else
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CCOPY_LIST(f2, tp2, l2);
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} else if (f1 < l1) {
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if (iflag)
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ICOPY_LIST(f1, tp2, l1);
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else
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CCOPY_LIST(f1, tp2, l1);
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}
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*p1 = l2;
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}
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tp2 = list1; /* swap list1, list2 */
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list1 = list2;
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list2 = tp2;
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last = list2 + nmemb*size;
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}
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if (base == list2) {
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memmove(list2, list1, nmemb*size);
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list2 = list1;
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}
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// JAB: convert to mfree
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//free(list2);
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if(!bufSpace) mfree(list2, mallocsize, "gbmergesort");
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// JAB: return void now
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//return (0);
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return;
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}
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// JAB: namespace collision with qsort
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//#define swap(a, b) {
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#define merge_swap(a, b) { \
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s = b; \
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i = size; \
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do { \
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tmp = *a; *a++ = *s; *s++ = tmp; \
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} while (--i); \
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a -= size; \
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}
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#define reverse(bot, top) { \
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s = top; \
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do { \
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i = size; \
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do { \
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tmp = *bot; *bot++ = *s; *s++ = tmp; \
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} while (--i); \
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s -= size2; \
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} while(bot < s); \
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}
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/*
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* Optional hybrid natural/pairwise first pass. Eats up list1 in runs of
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* increasing order, list2 in a corresponding linked list. Checks for runs
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* when THRESHOLD/2 pairs compare with same sense. (Only used when NATURAL
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* is defined. Otherwise simple pairwise merging is used.)
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*/
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// JAB: avoid namespace polution...
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//void
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static void
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setup(u_char *list1, u_char *list2, size_t n, size_t size,
|
|
int (*cmp)(const void *, const void *))
|
|
{
|
|
int i, length, size2, tmp, sense;
|
|
u_char *f1, *f2, *s, *l2, *last, *p2;
|
|
|
|
size2 = size*2;
|
|
if (n <= 5) {
|
|
insertionsort(list1, n, size, cmp);
|
|
*EVAL(list2) = (u_char*) list2 + n*size;
|
|
return;
|
|
}
|
|
/*
|
|
* Avoid running pointers out of bounds; limit n to evens
|
|
* for simplicity.
|
|
*/
|
|
i = 4 + (n & 1);
|
|
insertionsort(list1 + (n - i) * size, i, size, cmp);
|
|
last = list1 + size * (n - i);
|
|
*EVAL(list2 + (last - list1)) = list2 + n * size;
|
|
|
|
#ifdef NATURAL
|
|
p2 = list2;
|
|
f1 = list1;
|
|
sense = (cmp(f1, f1 + size) > 0);
|
|
for (; f1 < last; sense = !sense) {
|
|
length = 2;
|
|
/* Find pairs with same sense. */
|
|
for (f2 = f1 + size2; f2 < last; f2 += size2) {
|
|
if ((cmp(f2, f2+ size) > 0) != sense)
|
|
break;
|
|
length += 2;
|
|
}
|
|
if (length < THRESHOLD) { /* Pairwise merge */
|
|
do {
|
|
p2 = *EVAL(p2) = f1 + size2 - list1 + list2;
|
|
if (sense > 0)
|
|
merge_swap (f1, f1 + size);
|
|
} while ((f1 += size2) < f2);
|
|
} else { /* Natural merge */
|
|
l2 = f2;
|
|
for (f2 = f1 + size2; f2 < l2; f2 += size2) {
|
|
if ((cmp(f2-size, f2) > 0) != sense) {
|
|
p2 = *EVAL(p2) = f2 - list1 + list2;
|
|
if (sense > 0)
|
|
reverse(f1, f2-size);
|
|
f1 = f2;
|
|
}
|
|
}
|
|
if (sense > 0)
|
|
reverse (f1, f2-size);
|
|
f1 = f2;
|
|
if (f2 < last || cmp(f2 - size, f2) > 0)
|
|
p2 = *EVAL(p2) = f2 - list1 + list2;
|
|
else
|
|
p2 = *EVAL(p2) = list2 + n*size;
|
|
}
|
|
}
|
|
#else /* pairwise merge only. */
|
|
for (f1 = list1, p2 = list2; f1 < last; f1 += size2) {
|
|
p2 = *EVAL(p2) = p2 + size2;
|
|
if (cmp (f1, f1 + size) > 0)
|
|
merge_swap(f1, f1 + size);
|
|
}
|
|
#endif /* NATURAL */
|
|
}
|
|
|
|
/*
|
|
* This is to avoid out-of-bounds addresses in sorting the
|
|
* last 4 elements.
|
|
*/
|
|
static void
|
|
insertionsort(u_char *a, size_t n, size_t size,
|
|
int (*cmp)(const void *, const void *))
|
|
{
|
|
u_char *ai, *s, *t, *u, tmp;
|
|
int i;
|
|
|
|
for (ai = a+size; --n >= 1; ai += size)
|
|
for (t = ai; t > a; t -= size) {
|
|
u = t - size;
|
|
if (cmp(u, t) <= 0)
|
|
break;
|
|
merge_swap(u, t);
|
|
}
|
|
}
|