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/*
Copyright (C) 2002 FPMD group
This file is distributed under the terms of the
GNU General Public License. See the file `License'
in the root directory of the present distribution,
or http://www.gnu.org/copyleft/gpl.txt .
*/
#include<stdio.h>
#include<stdlib.h>
/* qsort - quick sort
qsort(n,comp,swap)
unsigned n;
int (*comp)();
int (*swap)();
***** see bsort for parameters
*/
static unsigned _rearr(unsigned lb,unsigned ub);
static void _quick(unsigned lb,unsigned ub);
static int (*_comp)(unsigned,unsigned), (*_swap)(unsigned,unsigned);
void Qsort(unsigned n,int (*comp)(),int (*swap)())
{
_comp = comp;
_swap = swap;
_quick(0,n-1);
}
static void _quick(unsigned lb,unsigned ub)
{
unsigned j;
if(lb<ub)
{
if((j = _rearr(lb,ub)))
_quick(lb,j-1);
_quick(j+1,ub);
}
}
static unsigned _rearr(unsigned lb,unsigned ub)
{
do
{
while(ub > lb && (*_comp)(ub,lb) >=0) ub--;
if(ub != lb)
{
(*_swap)(ub,lb);
while(lb<ub && (*_comp)(lb,ub)<=0) lb++;
if(lb != ub) (*_swap)(lb,ub);
}
} while(lb != ub);
return lb;
}
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