| 1 | /*␊ |
| 2 | * Copyright (c) 1999-2003 Apple Computer, Inc. All rights reserved.␊ |
| 3 | *␊ |
| 4 | * @APPLE_LICENSE_HEADER_START@␊ |
| 5 | * ␊ |
| 6 | * Portions Copyright (c) 1999-2003 Apple Computer, Inc. All Rights␊ |
| 7 | * Reserved. This file contains Original Code and/or Modifications of␊ |
| 8 | * Original Code as defined in and that are subject to the Apple Public␊ |
| 9 | * Source License Version 2.0 (the "License"). You may not use this file␊ |
| 10 | * except in compliance with the License. Please obtain a copy of the␊ |
| 11 | * License at http://www.apple.com/publicsource and read it before using␊ |
| 12 | * this file.␊ |
| 13 | * ␊ |
| 14 | * The Original Code and all software distributed under the License are␊ |
| 15 | * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER␊ |
| 16 | * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,␊ |
| 17 | * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,␊ |
| 18 | * FITNESS FOR A PARTICULAR PURPOSE OR NON- INFRINGEMENT. Please see the␊ |
| 19 | * License for the specific language governing rights and limitations␊ |
| 20 | * under the License.␊ |
| 21 | * ␊ |
| 22 | * @APPLE_LICENSE_HEADER_END@␊ |
| 23 | */␊ |
| 24 | /*␊ |
| 25 | * Copyright (c) 1992, 1993␊ |
| 26 | *␉The Regents of the University of California. All rights reserved.␊ |
| 27 | *␊ |
| 28 | * Redistribution and use in source and binary forms, with or without␊ |
| 29 | * modification, are permitted provided that the following conditions␊ |
| 30 | * are met:␊ |
| 31 | * 1. Redistributions of source code must retain the above copyright␊ |
| 32 | * notice, this list of conditions and the following disclaimer.␊ |
| 33 | * 2. Redistributions in binary form must reproduce the above copyright␊ |
| 34 | * notice, this list of conditions and the following disclaimer in the␊ |
| 35 | * documentation and/or other materials provided with the distribution.␊ |
| 36 | * 3. All advertising materials mentioning features or use of this software␊ |
| 37 | * must display the following acknowledgement:␊ |
| 38 | *␉This product includes software developed by the University of␊ |
| 39 | *␉California, Berkeley and its contributors.␊ |
| 40 | * 4. Neither the name of the University nor the names of its contributors␊ |
| 41 | * may be used to endorse or promote products derived from this software␊ |
| 42 | * without specific prior written permission.␊ |
| 43 | *␊ |
| 44 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND␊ |
| 45 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE␊ |
| 46 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE␊ |
| 47 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE␊ |
| 48 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL␊ |
| 49 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS␊ |
| 50 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)␊ |
| 51 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT␊ |
| 52 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY␊ |
| 53 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF␊ |
| 54 | * SUCH DAMAGE.␊ |
| 55 | */␊ |
| 56 | ␊ |
| 57 | ␊ |
| 58 | #include <sys/types.h>␊ |
| 59 | #include <stdlib.h>␊ |
| 60 | ␊ |
| 61 | static inline char␉*med3 __P((char *, char *, char *, int (*)()));␊ |
| 62 | static inline void␉ swapfunc __P((char *, char *, int, int));␊ |
| 63 | ␊ |
| 64 | #define min(a, b)␉(a) < (b) ? a : b␊ |
| 65 | ␊ |
| 66 | /*␊ |
| 67 | * Qsort routine from Bentley & McIlroy's "Engineering a Sort Function".␊ |
| 68 | */␊ |
| 69 | #define swapcode(TYPE, parmi, parmj, n) { ␉␉\␊ |
| 70 | ␉long i = (n) / sizeof (TYPE); ␉␉␉\␊ |
| 71 | ␉register TYPE *pi = (TYPE *) (parmi); ␉␉\␊ |
| 72 | ␉register TYPE *pj = (TYPE *) (parmj); ␉␉\␊ |
| 73 | ␉do { ␉␉␉␉␉␉\␊ |
| 74 | ␉␉register TYPE␉t = *pi;␉␉\␊ |
| 75 | ␉␉*pi++ = *pj;␉␉␉␉\␊ |
| 76 | ␉␉*pj++ = t;␉␉␉␉\␊ |
| 77 | } while (--i > 0);␉␉␉␉\␊ |
| 78 | }␊ |
| 79 | ␊ |
| 80 | #define SWAPINIT(a, es) swaptype = ((char *)a - (char *)0) % sizeof(long) || \␊ |
| 81 | ␉es % sizeof(long) ? 2 : es == sizeof(long)? 0 : 1;␊ |
| 82 | ␊ |
| 83 | static inline void␊ |
| 84 | swapfunc(a, b, n, swaptype)␊ |
| 85 | ␉char *a, *b;␊ |
| 86 | ␉int n, swaptype;␊ |
| 87 | {␊ |
| 88 | ␉if(swaptype <= 1) ␊ |
| 89 | ␉␉swapcode(long, a, b, n)␊ |
| 90 | ␉else␊ |
| 91 | ␉␉swapcode(char, a, b, n)␊ |
| 92 | }␊ |
| 93 | ␊ |
| 94 | #define swap(a, b)␉␉␉␉␉\␊ |
| 95 | ␉if (swaptype == 0) {␉␉␉␉\␊ |
| 96 | ␉␉long t = *(long *)(a);␉␉␉\␊ |
| 97 | ␉␉*(long *)(a) = *(long *)(b);␉␉\␊ |
| 98 | ␉␉*(long *)(b) = t;␉␉␉\␊ |
| 99 | ␉} else␉␉␉␉␉␉\␊ |
| 100 | ␉␉swapfunc(a, b, es, swaptype)␊ |
| 101 | ␊ |
| 102 | #define vecswap(a, b, n) ␉if ((n) > 0) swapfunc(a, b, n, swaptype)␊ |
| 103 | ␊ |
| 104 | static inline char *␊ |
| 105 | med3(a, b, c, cmp)␊ |
| 106 | ␉char *a, *b, *c;␊ |
| 107 | ␉int (*cmp)();␊ |
| 108 | {␊ |
| 109 | ␉return cmp(a, b) < 0 ?␊ |
| 110 | ␉ (cmp(b, c) < 0 ? b : (cmp(a, c) < 0 ? c : a ))␊ |
| 111 | :(cmp(b, c) > 0 ? b : (cmp(a, c) < 0 ? a : c ));␊ |
| 112 | }␊ |
| 113 | ␊ |
| 114 | void␊ |
| 115 | qsort(a, n, es, cmp)␊ |
| 116 | ␉void *a;␊ |
| 117 | ␉size_t n, es;␊ |
| 118 | ␉int (*cmp)();␊ |
| 119 | {␊ |
| 120 | ␉char *pa, *pb, *pc, *pd, *pl, *pm, *pn;␊ |
| 121 | ␉int d, r, swaptype, swap_cnt;␊ |
| 122 | ␊ |
| 123 | loop:␉SWAPINIT(a, es);␊ |
| 124 | ␉swap_cnt = 0;␊ |
| 125 | ␉if (n < 7) {␊ |
| 126 | ␉␉for (pm = a + es; pm < (char *) a + n * es; pm += es)␊ |
| 127 | ␉␉␉for (pl = pm; pl > (char *) a && cmp(pl - es, pl) > 0;␊ |
| 128 | ␉␉␉ pl -= es)␊ |
| 129 | ␉␉␉␉swap(pl, pl - es);␊ |
| 130 | ␉␉return;␊ |
| 131 | ␉}␊ |
| 132 | ␉pm = a + (n / 2) * es;␊ |
| 133 | ␉if (n > 7) {␊ |
| 134 | ␉␉pl = a;␊ |
| 135 | ␉␉pn = a + (n - 1) * es;␊ |
| 136 | ␉␉if (n > 40) {␊ |
| 137 | ␉␉␉d = (n / 8) * es;␊ |
| 138 | ␉␉␉pl = med3(pl, pl + d, pl + 2 * d, cmp);␊ |
| 139 | ␉␉␉pm = med3(pm - d, pm, pm + d, cmp);␊ |
| 140 | ␉␉␉pn = med3(pn - 2 * d, pn - d, pn, cmp);␊ |
| 141 | ␉␉}␊ |
| 142 | ␉␉pm = med3(pl, pm, pn, cmp);␊ |
| 143 | ␉}␊ |
| 144 | ␉swap(a, pm);␊ |
| 145 | ␉pa = pb = a + es;␊ |
| 146 | ␊ |
| 147 | ␉pc = pd = a + (n - 1) * es;␊ |
| 148 | ␉for (;;) {␊ |
| 149 | ␉␉while (pb <= pc && (r = cmp(pb, a)) <= 0) {␊ |
| 150 | ␉␉␉if (r == 0) {␊ |
| 151 | ␉␉␉␉swap_cnt = 1;␊ |
| 152 | ␉␉␉␉swap(pa, pb);␊ |
| 153 | ␉␉␉␉pa += es;␊ |
| 154 | ␉␉␉}␊ |
| 155 | ␉␉␉pb += es;␊ |
| 156 | ␉␉}␊ |
| 157 | ␉␉while (pb <= pc && (r = cmp(pc, a)) >= 0) {␊ |
| 158 | ␉␉␉if (r == 0) {␊ |
| 159 | ␉␉␉␉swap_cnt = 1;␊ |
| 160 | ␉␉␉␉swap(pc, pd);␊ |
| 161 | ␉␉␉␉pd -= es;␊ |
| 162 | ␉␉␉}␊ |
| 163 | ␉␉␉pc -= es;␊ |
| 164 | ␉␉}␊ |
| 165 | ␉␉if (pb > pc)␊ |
| 166 | ␉␉␉break;␊ |
| 167 | ␉␉swap(pb, pc);␊ |
| 168 | ␉␉swap_cnt = 1;␊ |
| 169 | ␉␉pb += es;␊ |
| 170 | ␉␉pc -= es;␊ |
| 171 | ␉}␊ |
| 172 | ␉if (swap_cnt == 0) { /* Switch to insertion sort */␊ |
| 173 | ␉␉for (pm = a + es; pm < (char *) a + n * es; pm += es)␊ |
| 174 | ␉␉␉for (pl = pm; pl > (char *) a && cmp(pl - es, pl) > 0; ␊ |
| 175 | ␉␉␉ pl -= es)␊ |
| 176 | ␉␉␉␉swap(pl, pl - es);␊ |
| 177 | ␉␉return;␊ |
| 178 | ␉}␊ |
| 179 | ␊ |
| 180 | ␉pn = a + n * es;␊ |
| 181 | ␉r = min(pa - (char *)a, pb - pa);␊ |
| 182 | ␉vecswap(a, pb - r, r);␊ |
| 183 | ␉r = min(pd - pc, (pn - pd) - (int)es);␊ |
| 184 | ␉vecswap(pb, pn - r, r);␊ |
| 185 | ␉if ((r = pb - pa) > (int)es)␊ |
| 186 | ␉␉qsort(a, r / es, es, cmp);␊ |
| 187 | ␉if ((r = pd - pc) > (int)es) { ␊ |
| 188 | ␉␉/* Iterate rather than recurse to save stack space */␊ |
| 189 | ␉␉a = pn - r;␊ |
| 190 | ␉␉n = r / es;␊ |
| 191 | ␉␉goto loop;␊ |
| 192 | ␉}␊ |
| 193 | /*␉␉qsort(pn - r, r / es, es, cmp);*/␊ |
| 194 | }␊ |
| 195 | |
