264 lines
8.8 KiB
C
264 lines
8.8 KiB
C
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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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* 4. 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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#if HAVE_CONFIG_H
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#include "clamav-config.h"
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#endif
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#include <stdlib.h>
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#include "clamav.h"
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#include "platform.h"
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#include "others.h"
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static inline char *med3(char *, char *, char *, int (*)(const void *, const void *));
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static inline char *med3_r(void *, char *, char *, char *, int (*)(const void *, const void *, const 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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{ \
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long i = (n) / sizeof(TYPE); \
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register TYPE *pi = (TYPE *)(parmi); \
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register TYPE *pj = (TYPE *)(parmj); \
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do { \
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register 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) \
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? 2 \
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: es == sizeof(long) ? 0 : 1;
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static inline void
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swapfunc(a, b, n, swaptype) char *a,
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*b;
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int n, swaptype;
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{
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if (swaptype <= 1)
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swapcode(long, a, b, n) else 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(a, b, es, swaptype)
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#define vecswap(a, b, n) \
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if ((n) > 0) swapfunc(a, b, n, swaptype)
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#define CMP1(a, b) ((int)(*((uint32_t *)(a)) - *((uint32_t *)(b))))
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#define CMP(a, b) (cmp ? (cmp(a, b)) : CMP1(a, b))
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#define CMP_R(arg, a, b) (cmp ? (cmp(arg, a, b)) : CMP1(a, b))
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#define MED3(a, b, c, d) (d ? (med3(a, b, c, d)) : (CMP1(a, b) < 0 ? (CMP1(b, c) < 0 ? (b) : (CMP1(a, c) < 0 ? (c) : (a))) : (CMP1(b, c) > 0 ? (b) : (CMP1(a, c) < 0 ? (a) : (c)))))
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#define MED3_R(arg, a, b, c, d) (d ? (med3_r(arg, a, b, c, d)) : (CMP1(a, b) < 0 ? (CMP1(b, c) < 0 ? (b) : (CMP1(a, c) < 0 ? (c) : (a))) : (CMP1(b, c) > 0 ? (b) : (CMP1(a, c) < 0 ? (a) : (c)))))
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static inline char *
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med3(a, b, c, cmp) char *a,
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*b, *c;
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int (*cmp)(const void *, const void *);
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{
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return CMP(a, b) < 0 ? (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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static inline char *
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med3_r(arg, a, b, c, cmp) void *arg;
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char *a, *b, *c;
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int (*cmp)(const void *, const void *, const void *);
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{
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return CMP_R(arg, a, b) < 0 ? (CMP_R(arg, b, c) < 0 ? b : (CMP_R(arg, a, c) < 0 ? c : a))
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: (CMP_R(arg, b, c) > 0 ? b : (CMP_R(arg, a, c) < 0 ? a : c));
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}
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void cli_qsort(void *a, size_t n, size_t es, 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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loop:
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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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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 = 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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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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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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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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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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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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r = MIN((size_t)(pd - pc), (size_t)(pn - pd - es));
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vecswap(pb, pn - r, r);
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if ((size_t)(r = pb - pa) > es)
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cli_qsort(a, r / es, es, cmp);
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if ((size_t)(r = pd - pc) > 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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/* cli_qsort(pn - r, r / es, es, cmp);*/
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}
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void cli_qsort_r(void *a, size_t n, size_t es, int (*cmp)(const void *, const void *, const void *), void *arg)
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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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loop:
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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_R(arg, pl - es, pl) > 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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pm = (char *)a + (n / 2) * es;
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if (n > 7) {
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pl = 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_R(arg, pl, pl + d, pl + 2 * d, cmp);
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pm = MED3_R(arg, pm - d, pm, pm + d, cmp);
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pn = MED3_R(arg, pn - 2 * d, pn - d, pn, cmp);
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}
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pm = MED3_R(arg, pl, pm, pn, cmp);
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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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for (;;) {
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while (pb <= pc && (r = CMP_R(arg, pb, a)) <= 0) {
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if (r == 0) {
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swap_cnt = 1;
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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_R(arg, pc, a)) >= 0) {
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if (r == 0) {
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swap_cnt = 1;
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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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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_R(arg, pl - es, pl) > 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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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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r = MIN((size_t)(pd - pc), (size_t)(pn - pd - es));
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vecswap(pb, pn - r, r);
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if ((size_t)(r = pb - pa) > es)
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cli_qsort_r(a, r / es, es, cmp, arg);
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if ((size_t)(r = pd - pc) > 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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/* cli_qsort_r(pn - r, r / es, es, cmp);*/
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}
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