140c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project/* 240c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project * Copyright (c) 1992, 1993 340c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project * The Regents of the University of California. All rights reserved. 440c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project * 540c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project * Redistribution and use in source and binary forms, with or without 640c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project * modification, are permitted provided that the following conditions 740c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project * are met: 840c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project * 1. Redistributions of source code must retain the above copyright 940c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project * notice, this list of conditions and the following disclaimer. 1040c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project * 2. Redistributions in binary form must reproduce the above copyright 1140c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project * notice, this list of conditions and the following disclaimer in the 1240c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project * documentation and/or other materials provided with the distribution. 1340c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project * 3. Neither the name of the University nor the names of its contributors 1440c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project * may be used to endorse or promote products derived from this software 1540c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project * without specific prior written permission. 1640c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project * 1740c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 1840c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 1940c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 2040c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 2140c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 2240c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 2340c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 2440c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 2540c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 2640c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 2740c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project * SUCH DAMAGE. 2840c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project */ 2940c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project 3040c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project#include "yportenv.h" 3140c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project//#include <linux/string.h> 3240c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project 3340c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project/* 3440c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project * Qsort routine from Bentley & McIlroy's "Engineering a Sort Function". 3540c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project */ 3640c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project#define swapcode(TYPE, parmi, parmj, n) { \ 3740c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project long i = (n) / sizeof (TYPE); \ 3840c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project register TYPE *pi = (TYPE *) (parmi); \ 3940c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project register TYPE *pj = (TYPE *) (parmj); \ 4040c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project do { \ 4140c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project register TYPE t = *pi; \ 4240c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project *pi++ = *pj; \ 4340c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project *pj++ = t; \ 4440c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project } while (--i > 0); \ 4540c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project} 4640c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project 4740c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project#define SWAPINIT(a, es) swaptype = ((char *)a - (char *)0) % sizeof(long) || \ 4840c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project es % sizeof(long) ? 2 : es == sizeof(long)? 0 : 1; 4940c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project 5040c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Projectstatic __inline void 5140c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Projectswapfunc(char *a, char *b, int n, int swaptype) 5240c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project{ 5340c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project if (swaptype <= 1) 5440c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project swapcode(long, a, b, n) 5540c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project else 5640c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project swapcode(char, a, b, n) 5740c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project} 5840c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project 5940c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project#define swap(a, b) \ 6040c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project if (swaptype == 0) { \ 6140c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project long t = *(long *)(a); \ 6240c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project *(long *)(a) = *(long *)(b); \ 6340c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project *(long *)(b) = t; \ 6440c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project } else \ 6540c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project swapfunc(a, b, es, swaptype) 6640c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project 6740c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project#define vecswap(a, b, n) if ((n) > 0) swapfunc(a, b, n, swaptype) 6840c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project 6940c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Projectstatic __inline char * 7040c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Projectmed3(char *a, char *b, char *c, int (*cmp)(const void *, const void *)) 7140c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project{ 7240c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project return cmp(a, b) < 0 ? 7340c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project (cmp(b, c) < 0 ? b : (cmp(a, c) < 0 ? c : a )) 7440c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project :(cmp(b, c) > 0 ? b : (cmp(a, c) < 0 ? a : c )); 7540c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project} 7640c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project 7740c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project#define min(a,b) (((a) < (b)) ? (a) : (b)) 7840c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Projectvoid 7940c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Projectqsort(void *aa, size_t n, size_t es, int (*cmp)(const void *, const void *)) 8040c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project{ 8140c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project char *pa, *pb, *pc, *pd, *pl, *pm, *pn; 8240c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project int d, r, swaptype, swap_cnt; 8340c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project register char *a = aa; 8440c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project 8540c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Projectloop: SWAPINIT(a, es); 8640c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project swap_cnt = 0; 8740c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project if (n < 7) { 8840c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project for (pm = (char *)a + es; pm < (char *) a + n * es; pm += es) 8940c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project for (pl = pm; pl > (char *) a && cmp(pl - es, pl) > 0; 9040c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project pl -= es) 9140c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project swap(pl, pl - es); 9240c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project return; 9340c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project } 9440c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project pm = (char *)a + (n / 2) * es; 9540c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project if (n > 7) { 9640c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project pl = (char *)a; 9740c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project pn = (char *)a + (n - 1) * es; 9840c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project if (n > 40) { 9940c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project d = (n / 8) * es; 10040c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project pl = med3(pl, pl + d, pl + 2 * d, cmp); 10140c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project pm = med3(pm - d, pm, pm + d, cmp); 10240c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project pn = med3(pn - 2 * d, pn - d, pn, cmp); 10340c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project } 10440c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project pm = med3(pl, pm, pn, cmp); 10540c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project } 10640c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project swap(a, pm); 10740c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project pa = pb = (char *)a + es; 10840c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project 10940c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project pc = pd = (char *)a + (n - 1) * es; 11040c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project for (;;) { 11140c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project while (pb <= pc && (r = cmp(pb, a)) <= 0) { 11240c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project if (r == 0) { 11340c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project swap_cnt = 1; 11440c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project swap(pa, pb); 11540c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project pa += es; 11640c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project } 11740c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project pb += es; 11840c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project } 11940c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project while (pb <= pc && (r = cmp(pc, a)) >= 0) { 12040c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project if (r == 0) { 12140c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project swap_cnt = 1; 12240c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project swap(pc, pd); 12340c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project pd -= es; 12440c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project } 12540c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project pc -= es; 12640c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project } 12740c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project if (pb > pc) 12840c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project break; 12940c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project swap(pb, pc); 13040c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project swap_cnt = 1; 13140c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project pb += es; 13240c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project pc -= es; 13340c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project } 13440c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project if (swap_cnt == 0) { /* Switch to insertion sort */ 13540c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project for (pm = (char *) a + es; pm < (char *) a + n * es; pm += es) 13640c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project for (pl = pm; pl > (char *) a && cmp(pl - es, pl) > 0; 13740c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project pl -= es) 13840c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project swap(pl, pl - es); 13940c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project return; 14040c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project } 14140c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project 14240c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project pn = (char *)a + n * es; 14340c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project r = min(pa - (char *)a, pb - pa); 14440c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project vecswap(a, pb - r, r); 14540c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project r = min((long)(pd - pc), (long)(pn - pd - es)); 14640c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project vecswap(pb, pn - r, r); 14740c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project if ((r = pb - pa) > es) 14840c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project qsort(a, r / es, es, cmp); 14940c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project if ((r = pd - pc) > es) { 15040c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project /* Iterate rather than recurse to save stack space */ 15140c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project a = pn - r; 15240c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project n = r / es; 15340c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project goto loop; 15440c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project } 15540c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project/* qsort(pn - r, r / es, es, cmp);*/ 15640c4004d07a37a9b140067f893930ce4436b9346The Android Open Source Project} 157