mirror of
https://github.com/LadybirdBrowser/ladybird.git
synced 2024-12-09 07:50:33 +00:00
78 lines
3 KiB
C++
78 lines
3 KiB
C++
|
/*-
|
||
|
* Copyright (c) 1980, 1983, 1990 The Regents of the University of California.
|
||
|
* All rights reserved.
|
||
|
*
|
||
|
* Redistribution and use in source and binary forms, with or without
|
||
|
* modification, are permitted provided that the following conditions
|
||
|
* are met:
|
||
|
* 1. Redistributions of source code must retain the above copyright
|
||
|
* notice, this list of conditions and the following disclaimer.
|
||
|
* 2. Redistributions in binary form must reproduce the above copyright
|
||
|
* notice, this list of conditions and the following disclaimer in the
|
||
|
* documentation and/or other materials provided with the distribution.
|
||
|
* 3. All advertising materials mentioning features or use of this software
|
||
|
* must display the following acknowledgement:
|
||
|
* This product includes software developed by the University of
|
||
|
* California, Berkeley and its contributors.
|
||
|
* 4. Neither the name of the University nor the names of its contributors
|
||
|
* may be used to endorse or promote products derived from this software
|
||
|
* without specific prior written permission.
|
||
|
*
|
||
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
||
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
||
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
||
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
||
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
||
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
||
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
||
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
||
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
||
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
||
|
* SUCH DAMAGE.
|
||
|
*/
|
||
|
|
||
|
#if defined(LIBC_SCCS) && !defined(lint)
|
||
|
static char sccsid[] = "@(#)qsort.c 5.9 (Berkeley) 2/23/91";
|
||
|
#endif /* LIBC_SCCS and not lint */
|
||
|
|
||
|
#include <sys/types.h>
|
||
|
#include <stdlib.h>
|
||
|
|
||
|
static void insertion_sort(void* bot, size_t nmemb, size_t size, int (*compar)(const void *, const void *));
|
||
|
|
||
|
void qsort(void* bot, size_t nmemb, size_t size, int (*compar)(const void *, const void *))
|
||
|
{
|
||
|
if (nmemb <= 1)
|
||
|
return;
|
||
|
|
||
|
insertion_sort(bot, nmemb, size, compar);
|
||
|
}
|
||
|
|
||
|
void insertion_sort(void* bot, size_t nmemb, size_t size, int (*compar)(const void *, const void *))
|
||
|
{
|
||
|
int cnt;
|
||
|
unsigned char ch;
|
||
|
char *s1, *s2, *t1, *t2, *top;
|
||
|
|
||
|
/*
|
||
|
* A simple insertion sort (see Knuth, Vol. 3, page 81, Algorithm
|
||
|
* S). Insertion sort has the same worst case as most simple sorts
|
||
|
* (O N^2). It gets used here because it is (O N) in the case of
|
||
|
* sorted data.
|
||
|
*/
|
||
|
top = (char*)bot + nmemb * size;
|
||
|
for (t1 = (char*)bot + size; t1 < top;) {
|
||
|
for (t2 = t1; (t2 -= size) >= bot && compar(t1, t2) < 0;);
|
||
|
if (t1 != (t2 += size)) {
|
||
|
/* Bubble bytes up through each element. */
|
||
|
for (cnt = size; cnt--; ++t1) {
|
||
|
ch = *t1;
|
||
|
for (s1 = s2 = t1; (s2 -= size) >= t2; s1 = s2)
|
||
|
*s1 = *s2;
|
||
|
*s1 = ch;
|
||
|
}
|
||
|
} else
|
||
|
t1 += size;
|
||
|
}
|
||
|
}
|