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77 lines
3 KiB
C++
77 lines
3 KiB
C++
/*-
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* Copyright (c) 1980, 1983, 1990 The Regents of the University of California.
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* 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. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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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 defined(LIBC_SCCS) && !defined(lint)
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static char sccsid[] = "@(#)qsort.c 5.9 (Berkeley) 2/23/91";
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#endif /* LIBC_SCCS and not lint */
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#include <sys/types.h>
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#include <stdlib.h>
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static void insertion_sort(void* bot, size_t nmemb, size_t size, int (*compar)(const void *, const void *));
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void qsort(void* bot, size_t nmemb, size_t size, int (*compar)(const void *, const void *))
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{
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if (nmemb <= 1)
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return;
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insertion_sort(bot, nmemb, size, compar);
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}
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void insertion_sort(void* bot, size_t nmemb, size_t size, int (*compar)(const void *, const void *))
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{
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int cnt;
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unsigned char ch;
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char *s1, *s2, *t1, *t2, *top;
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/*
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* A simple insertion sort (see Knuth, Vol. 3, page 81, Algorithm
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* S). Insertion sort has the same worst case as most simple sorts
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* (O N^2). It gets used here because it is (O N) in the case of
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* sorted data.
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*/
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top = (char*)bot + nmemb * size;
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for (t1 = (char*)bot + size; t1 < top;) {
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for (t2 = t1; (t2 -= size) >= bot && compar(t1, t2) < 0;);
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if (t1 != (t2 += size)) {
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/* Bubble bytes up through each element. */
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for (cnt = size; cnt--; ++t1) {
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ch = *t1;
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for (s1 = s2 = t1; (s2 -= size) >= t2; s1 = s2)
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*s1 = *s2;
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*s1 = ch;
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}
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} else
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t1 += size;
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}
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}
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