1 /*
2 * Copyright (c) 2000-2006 Apple Computer, Inc. All rights reserved.
3 *
4 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
5 *
6 * This file contains Original Code and/or Modifications of Original Code
7 * as defined in and that are subject to the Apple Public Source License
8 * Version 2.0 (the 'License'). You may not use this file except in
9 * compliance with the License. The rights granted to you under the License
10 * may not be used to create, or enable the creation or redistribution of,
11 * unlawful or unlicensed copies of an Apple operating system, or to
12 * circumvent, violate, or enable the circumvention or violation of, any
13 * terms of an Apple operating system software license agreement.
14 *
15 * Please obtain a copy of the License at
16 * http://www.opensource.apple.com/apsl/ and read it before using this file.
17 *
18 * The Original Code and all software distributed under the License are
19 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
20 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
21 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
22 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
23 * Please see the License for the specific language governing rights and
24 * limitations under the License.
25 *
26 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
27 */
28 /*
29 * Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved
30 *
31 * Copyright (c) 1992, 1993
32 * The Regents of the University of California. All rights reserved.
33 *
34 * Redistribution and use in source and binary forms, with or without
35 * modification, are permitted provided that the following conditions
36 * are met:
37 * 1. Redistributions of source code must retain the above copyright
38 * notice, this list of conditions and the following disclaimer.
39 * 2. Redistributions in binary form must reproduce the above copyright
40 * notice, this list of conditions and the following disclaimer in the
41 * documentation and/or other materials provided with the distribution.
42 * 3. All advertising materials mentioning features or use of this software
43 * must display the following acknowledgement:
44 * This product includes software developed by the University of
45 * California, Berkeley and its contributors.
46 * 4. Neither the name of the University nor the names of its contributors
47 * may be used to endorse or promote products derived from this software
48 * without specific prior written permission.
49 *
50 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
51 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
52 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
53 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
54 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
55 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
56 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
57 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
58 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
59 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
60 * SUCH DAMAGE.
61 *
62 * @(#)qsort.c 8.1 (Berkeley) 6/4/93
63 */
64
65
66 #include <sys/types.h>
67 //#include <stdlib.h>
68 #include <sys/kpi_private.h>
69
70 __private_extern__
71 void
72 qsort(void *a, size_t n, size_t es, int (*cmp)(const void *, const void *));
73
74 static inline char *med3(char *, char *, char *, int (*)(const void *, const void *));
75 static inline void swapfunc(char *, char *, long, int);
76
77 #define min(a, b) ((a) < (b) ? (a) : (b))
78
79 /*
80 * Qsort routine from Bentley & McIlroy's "Engineering a Sort Function".
81 */
82 #define swapcode(TYPE, parmi, parmj, n) \
83 long i = (n) / sizeof (TYPE); \
84 TYPE *pi = (TYPE *) (parmi); \
85 TYPE *pj = (TYPE *) (parmj); \
86 do { \
87 TYPE t = *pi; \
88 *pi++ = *pj; \
89 *pj++ = t; \
90 } while (--i > 0);
91
92 #define SWAPINIT(a, es) swaptype = ((char *)a - (char *)0) % sizeof(long) || \
93 es % sizeof(long) ? 2 : es == sizeof(long)? 0 : 1;
94
95 static inline void
swapfunc(char * a,char * b,long n,int swaptype)96 swapfunc(char *a, char *b, long n, int swaptype)
97 {
98 if (swaptype <= 1) {
99 swapcode(long, a, b, n);
100 } else {
101 swapcode(char, a, b, n);
102 }
103 }
104
105 #define swap(a, b) \
106 if (swaptype == 0) { \
107 long t = *(long *)(a); \
108 *(long *)(a) = *(long *)(b); \
109 *(long *)(b) = t; \
110 } else \
111 swapfunc(a, b, es, swaptype)
112
113 #define vecswap(a, b, n) if ((n) > 0) swapfunc(a, b, n, swaptype)
114
115 static inline char *
med3(char * a,char * b,char * c,int (* cmp)(const void *,const void *))116 med3(char *a, char *b, char *c, int (*cmp)(const void *, const void *))
117 {
118 return cmp(a, b) < 0 ?
119 (cmp(b, c) < 0 ? b : (cmp(a, c) < 0 ? c : a))
120 :(cmp(b, c) > 0 ? b : (cmp(a, c) < 0 ? a : c));
121 }
122
123 __private_extern__
124 void
qsort(void * a,size_t n,size_t es,int (* cmp)(const void *,const void *))125 qsort(void *a, size_t n, size_t es, int (*cmp)(const void *, const void *))
126 {
127 char *pa, *pb, *pc, *pd, *pl, *pm, *pn;
128 int swaptype, swap_cnt;
129 long d, r;
130
131 loop: SWAPINIT(a, es);
132 swap_cnt = 0;
133 if (n < 7) {
134 for (pm = (char *)a + es; pm < (char *) a + n * es; pm += es) {
135 for (pl = pm; pl > (char *) a && cmp(pl - es, pl) > 0;
136 pl -= es) {
137 swap(pl, (char *)(pl - es));
138 }
139 }
140 return;
141 }
142 pm = (char *)a + (n / 2) * es;
143 if (n > 7) {
144 pl = a;
145 pn = (char *)a + (n - 1) * es;
146 if (n > 40) {
147 d = (n / 8) * es;
148 pl = med3(pl, pl + d, pl + 2 * d, cmp);
149 pm = med3(pm - d, pm, pm + d, cmp);
150 pn = med3(pn - 2 * d, pn - d, pn, cmp);
151 }
152 pm = med3(pl, pm, pn, cmp);
153 }
154 swap(a, pm);
155 pa = pb = (char *)a + es;
156
157 pc = pd = (char *)a + (n - 1) * es;
158 for (;;) {
159 while (pb <= pc && (r = cmp(pb, a)) <= 0) {
160 if (r == 0) {
161 swap_cnt = 1;
162 swap(pa, pb);
163 pa += es;
164 }
165 pb += es;
166 }
167 while (pb <= pc && (r = cmp(pc, a)) >= 0) {
168 if (r == 0) {
169 swap_cnt = 1;
170 swap(pc, pd);
171 pd -= es;
172 }
173 pc -= es;
174 }
175 if (pb > pc) {
176 break;
177 }
178 swap(pb, pc);
179 swap_cnt = 1;
180 pb += es;
181 pc -= es;
182 }
183 if (swap_cnt == 0) { /* Switch to insertion sort */
184 for (pm = (char *)a + es; pm < (char *) a + n * es; pm += es) {
185 for (pl = pm; pl > (char *) a && cmp(pl - es, pl) > 0;
186 pl -= es) {
187 swap(pl, pl - es);
188 }
189 }
190 return;
191 }
192
193 pn = (char *)a + n * es;
194 r = min(pa - (char *)a, pb - pa);
195 vecswap(a, pb - r, r);
196 r = min(pd - pc, pn - pd - es);
197 vecswap(pb, pn - r, r);
198 if ((size_t)(r = pb - pa) > es) {
199 qsort(a, r / es, es, cmp);
200 }
201 if ((size_t)(r = pd - pc) > es) {
202 /* Iterate rather than recurse to save stack space */
203 a = pn - r;
204 n = r / es;
205 goto loop;
206 }
207 /* qsort(pn - r, r / es, es, cmp);*/
208 }
209
210 /* private KPI */
211 void
kx_qsort(void * array,size_t nm,size_t member_size,int (* cmpf)(const void *,const void *))212 kx_qsort(void *array, size_t nm, size_t member_size, int (*cmpf)(const void *, const void *))
213 {
214 qsort(array, nm, member_size, cmpf);
215 }
216