479 lines
12 KiB
C
479 lines
12 KiB
C
/*
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Copyright (c) 2006-2020 Chung, Hyung-Hwan. All rights reserved.
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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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THIS SOFTWARE IS PROVIDED BY THE AUTHOR "AS IS" AND ANY EXPRESS OR
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IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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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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#include <hawk-utl.h>
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#define qsort_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) do { \
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hawk_oow_t i = (n) / HAWK_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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} while(0)
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#define get_swaptype(a, elemsize) (((hawk_oob_t*)(a) - (hawk_oob_t*)0) % HAWK_SIZEOF(long) || elemsize % HAWK_SIZEOF(long)? 2 : elemsize == HAWK_SIZEOF(long)? 0 : 1)
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#define swap(a, b, elemsize) do { \
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switch (swaptype) \
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{ \
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case 0: \
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{ \
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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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break; \
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} \
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case 1: \
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swapcode(long, a, b, elemsize); \
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break; \
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default: \
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swapcode(hawk_oob_t, a, b, elemsize); \
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break; \
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} \
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} while(0)
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#define vecswap(a,b,n) do { \
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if ((n) > 0) \
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{ \
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if (swaptype <= 1) swapcode(long, a, b, n); \
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else swapcode(hawk_oob_t, a, b, n); \
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} \
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} while(0)
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static HAWK_INLINE hawk_oob_t* med3 (hawk_oob_t* a, hawk_oob_t* b, hawk_oob_t* c, hawk_sort_comper_t comper, void* ctx)
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{
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if (comper(a, b, ctx) < 0)
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{
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if (comper(b, c, ctx) < 0) return b;
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return (comper(a, c, ctx) < 0)? c: a;
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}
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else
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{
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if (comper(b, c, ctx) > 0) return b;
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return (comper(a, c, ctx) > 0)? c: a;
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}
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}
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static HAWK_INLINE hawk_oob_t* med3x (hawk_oob_t* a, hawk_oob_t* b, hawk_oob_t* c, hawk_sort_comperx_t comper, void* ctx)
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{
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int n;
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if (comper(a, b, ctx, &n) <= -1) return HAWK_NULL;
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if (n < 0)
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{
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if (comper(b, c, ctx, &n) <= -1) return HAWK_NULL;
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if (n < 0) return b;
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if (comper(a, c, ctx, &n) <= -1) return HAWK_NULL;
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return (n < 0)? c: a;
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}
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else
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{
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if (comper(b, c, ctx, &n) <= -1) return HAWK_NULL;
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if (n > 0) return b;
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if (comper(a, c, ctx, &n) <= -1) return HAWK_NULL;
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return (n > 0)? c: a;
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}
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}
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void hawk_qsort (void* base, hawk_oow_t nmemb, hawk_oow_t size, hawk_sort_comper_t comper, void* ctx)
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{
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hawk_oob_t* pa, * pb, * pc, * pd, * pl, * pm, * pn;
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int swaptype, swap_cnt;
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long r;
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hawk_oow_t d;
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register hawk_oob_t* a = (hawk_oob_t*)base;
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loop:
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swaptype = get_swaptype(a, size);
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swap_cnt = 0;
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if (nmemb < 7)
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{
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hawk_oob_t* end = (hawk_oob_t*)a + (nmemb * size);
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for (pm = (hawk_oob_t*)a + size; pm < end; pm += size)
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{
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for (pl = pm; pl > (hawk_oob_t*)a && comper(pl - size, pl, ctx) > 0; pl -= size)
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{
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swap(pl, pl - size, size);
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}
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}
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return;
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}
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pm = (hawk_oob_t*)a + (nmemb / 2) * size;
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if (nmemb > 7)
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{
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pl = (hawk_oob_t*)a;
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pn = (hawk_oob_t*)a + (nmemb - 1) * size;
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if (nmemb > 40)
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{
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d = (nmemb / 8) * size;
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pl = med3(pl, pl + d, pl + 2 * d, comper, ctx);
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pm = med3(pm - d, pm, pm + d, comper, ctx);
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pn = med3(pn - 2 * d, pn - d, pn, comper, ctx);
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}
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pm = med3(pl, pm, pn, comper, ctx);
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}
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swap(a, pm, size);
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pa = pb = (hawk_oob_t*)a + size;
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pc = pd = (hawk_oob_t*)a + (nmemb - 1) * size;
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for (;;)
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{
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while (pb <= pc && (r = comper(pb, a, ctx)) <= 0)
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{
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if (r == 0)
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{
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swap_cnt = 1;
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swap(pa, pb, size);
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pa += size;
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}
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pb += size;
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}
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while (pb <= pc && (r = comper(pc, a, ctx)) >= 0)
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{
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if (r == 0)
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{
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swap_cnt = 1;
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swap(pc, pd, size);
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pd -= size;
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}
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pc -= size;
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}
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if (pb > pc) break;
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swap (pb, pc, size);
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swap_cnt = 1;
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pb += size;
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pc -= size;
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}
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if (swap_cnt == 0)
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{
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/* switch to insertion sort */
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for (pm = (hawk_oob_t*)a + size;
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pm < (hawk_oob_t*)a + nmemb * size; pm += size)
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{
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for (pl = pm; pl > (hawk_oob_t*)a && comper(pl - size, pl, ctx) > 0; pl -= size)
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{
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swap(pl, pl - size, size);
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}
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}
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return;
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}
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pn = (hawk_oob_t*)a + nmemb * size;
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r = qsort_min(pa - (hawk_oob_t*)a, pb - pa);
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vecswap (a, pb - r, r);
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r = qsort_min (pd - pc, pn - pd - size);
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vecswap (pb, pn - r, r);
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if ((r = pb - pa) > size) hawk_qsort(a, r / size, size, comper, ctx);
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if ((r = pd - pc) > size)
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{
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/* Iterate rather than recurse to save stack space */
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a = pn - r;
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nmemb = r / size;
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goto loop;
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}
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/* qsort(pn - r, r / size, size, comper);*/
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}
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int hawk_qsortx (void* base, hawk_oow_t nmemb, hawk_oow_t size, hawk_sort_comperx_t comper, void* ctx)
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{
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hawk_oob_t* pa, * pb, * pc, * pd, * pl, * pm, * pn;
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int swaptype, swap_cnt;
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long r;
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int n;
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hawk_oow_t d;
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register hawk_oob_t* a = (hawk_oob_t*)base;
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loop:
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swaptype = get_swaptype(a, size);
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swap_cnt = 0;
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if (nmemb < 7)
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{
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hawk_oob_t* end = (hawk_oob_t*)a + (nmemb * size);
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for (pm = (hawk_oob_t*)a + size; pm < end; pm += size)
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{
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pl = pm;
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while (pl > (hawk_oob_t*)a)
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{
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hawk_oob_t* pl2 = pl - size;
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if (comper(pl2, pl, ctx, &n) <= -1) return -1;
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if (n <= 0) break;
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swap (pl, pl2, size);
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pl = pl2;
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}
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}
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return 0;
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}
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pm = (hawk_oob_t*)a + (nmemb / 2) * size;
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if (nmemb > 7)
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{
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pl = (hawk_oob_t*)a;
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pn = (hawk_oob_t*)a + (nmemb - 1) * size;
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if (nmemb > 40)
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{
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d = (nmemb / 8) * size;
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pl = med3x(pl, pl + d, pl + 2 * d, comper, ctx);
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if (!pl) return -1;
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pm = med3x(pm - d, pm, pm + d, comper, ctx);
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if (!pm) return -1;
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pn = med3x(pn - 2 * d, pn - d, pn, comper, ctx);
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if (!pn) return -1;
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}
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pm = med3x(pl, pm, pn, comper, ctx);
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if (!pm) return -1;
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}
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swap(a, pm, size);
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pa = pb = (hawk_oob_t*)a + size;
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pc = pd = (hawk_oob_t*)a + (nmemb - 1) * size;
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for (;;)
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{
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while (pb <= pc)
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{
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if (comper(pb, a, ctx, &n) <= -1) return -1;
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if (n > 0) break;
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if (n == 0)
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{
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swap_cnt = 1;
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swap(pa, pb, size);
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pa += size;
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}
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pb += size;
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}
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while (pb <= pc)
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{
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if (comper(pc, a, ctx, &n) <= -1) return -1;
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if (n < 0) break;
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if (n == 0)
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{
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swap_cnt = 1;
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swap(pc, pd, size);
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pd -= size;
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}
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pc -= size;
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}
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if (pb > pc) break;
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swap (pb, pc, size);
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swap_cnt = 1;
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pb += size;
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pc -= size;
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}
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if (swap_cnt == 0)
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{
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/* switch to insertion sort */
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hawk_oob_t* end = (hawk_oob_t*)a + (nmemb * size);
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for (pm = (hawk_oob_t*)a + size; pm < end; pm += size)
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{
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pl = pm;
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while (pl > (hawk_oob_t*)a)
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{
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if (comper(pl - size, pl, ctx, &n) <= -1) return -1;
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if (n <= 0) break;
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swap(pl, pl - size, size);
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pl = pl - size;
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}
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}
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return 0;
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}
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pn = (hawk_oob_t*)a + nmemb * size;
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r = qsort_min(pa - (hawk_oob_t*)a, pb - pa);
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vecswap (a, pb - r, r);
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r = qsort_min (pd - pc, pn - pd - size);
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vecswap (pb, pn - r, r);
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if ((r = pb - pa) > size)
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{
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if (hawk_qsortx(a, r / size, size, comper, ctx) <= -1) return -1;
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}
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if ((r = pd - pc) > size)
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{
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/* Iterate rather than recurse to save stack space */
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a = pn - r;
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nmemb = r / size;
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goto loop;
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}
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/* qsortx(pn - r, r / size, size, comper);*/
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return 0;
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}
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#if 0
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/*
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* Below is an example of a naive qsort implementation
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*/
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#define swap(a,b,size) \
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do { \
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hawk_oow_t i = 0; \
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hawk_oob_t* p1 = (a); \
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hawk_oob_t* p2 = (b); \
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for (i = 0; i < size; i++) { \
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hawk_oob_t t = *p1; \
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*p1 = *p2; \
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*p2 = t; \
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p1++; p2++; \
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} \
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} while (0)
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#define REF(x,i) (&((x)[(i)*size]))
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void hawk_qsort (void* base, hawk_oow_t nmemb, hawk_oow_t size, void* arg,
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int (*compar)(const void*, const void*, void*))
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{
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hawk_oow_t pivot, start, end;
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hawk_oob_t* p = (hawk_oob_t*)base;
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if (nmemb <= 1) return;
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if (nmemb == 2) {
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if (compar(REF(p,0), REF(p,1), arg) > 0)
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swap (REF(p,0), REF(p,1), size);
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return;
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}
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pivot = nmemb >> 1; /* choose the middle as the pivot index */
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swap (REF(p,pivot), REF(p,nmemb-1), size); /* swap the pivot with the last item */
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start = 0; end = nmemb - 2;
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while (1) {
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/* look for the larger value than pivot */
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while (start <= end &&
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compar(REF(p,start), REF(p,nmemb-1), arg) <= 0) start++;
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/* look for the less value than pivot. */
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while (end > start &&
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compar(REF(p,end), REF(p,nmemb-1), arg) >= 0) end--;
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if (start >= end) break; /* no more to swap */
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swap (REF(p,start), REF(p,end), size);
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start++; end--;
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}
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swap (REF(p,nmemb-1), REF(p,start), size);
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pivot = start; /* adjust the pivot index */
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hawk_qsort (REF(p,0), pivot, size, arg, compar);
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hawk_qsort (REF(p,pivot+1), nmemb - pivot - 1, size, arg, compar);
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}
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/*
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* For easier understanding, see the following
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*/
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#define swap(a, b) do { a ^= b; b ^= a; a ^= b; } while (0)
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void qsort (int* x, size_t n)
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{
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size_t index, start, end;
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int pivot;
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if (n <= 1) return;
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if (n == 2) {
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if (x[0] > x[1]) swap (x[0], x[1]);
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return;
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}
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index = n / 2; /* choose the middle as the pivot index */
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pivot = x[index]; /* store the pivot value */
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swap (x[index], x[n - 1]); /* swap the pivot with the last item */
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start = 0; end = n - 2;
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while (1) {
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/* look for the larger value than pivot */
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while (start <= end && x[start] <= pivot) start++;
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/* look for the less value than pivot. */
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while (end > start && x[end] >= pivot) end--;
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if (start >= end) {
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/* less values all on the left,
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* larger values all on the right
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*/
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break;
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}
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swap (x[start], x[end]);
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start++; end--;
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}
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x[n - 1] = x[start]; /* restore the pivot value */
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x[start] = pivot;
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index = start; /* adjust the pivot index */
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qsort (x, index);
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qsort (&x[index + 1], n - index - 1);
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}
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#endif
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