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Current File : /proc/self/root/home/b8009/php-5.6.22/Zend/zend_qsort.c
/*
   +----------------------------------------------------------------------+
   | Zend Engine                                                          |
   +----------------------------------------------------------------------+
   | Copyright (c) 1998-2016 Zend Technologies Ltd. (http://www.zend.com) |
   +----------------------------------------------------------------------+
   | This source file is subject to version 2.00 of the Zend license,     |
   | that is bundled with this package in the file LICENSE, and is        | 
   | available through the world-wide-web at the following url:           |
   | http://www.zend.com/license/2_00.txt.                                |
   | If you did not receive a copy of the Zend license and are unable to  |
   | obtain it through the world-wide-web, please send a note to          |
   | license@zend.com so we can mail you a copy immediately.              |
   +----------------------------------------------------------------------+
   | Authors: Sterling Hughes <sterling@php.net>                          |
   +----------------------------------------------------------------------+
*/

/* $Id$ */

#include "zend.h"
#include "zend_qsort.h"

#include <limits.h>

#define QSORT_STACK_SIZE (sizeof(size_t) * CHAR_BIT)

static void _zend_qsort_swap(void *a, void *b, size_t siz)
{
	register char  *tmp_a_char;
	register char  *tmp_b_char;
	register int   *tmp_a_int;
	register int   *tmp_b_int;
	register size_t i;
	int             t_i;
	char            t_c;

	tmp_a_int = (int *) a;
	tmp_b_int = (int *) b;

	for (i = sizeof(int); i <= siz; i += sizeof(int)) {
		t_i = *tmp_a_int;
		*tmp_a_int++ = *tmp_b_int;
		*tmp_b_int++ = t_i;
	}

	tmp_a_char = (char *) tmp_a_int;
	tmp_b_char = (char *) tmp_b_int;

	for (i = i - sizeof(int) + 1; i <= siz; ++i) {
		t_c = *tmp_a_char;
		*tmp_a_char++ = *tmp_b_char;
		*tmp_b_char++ = t_c;
	}
}

ZEND_API void zend_qsort_r(void *base, size_t nmemb, size_t siz, compare_r_func_t compare, void *arg TSRMLS_DC)
{
	void           *begin_stack[QSORT_STACK_SIZE];
	void           *end_stack[QSORT_STACK_SIZE];
	register char  *begin;
	register char  *end;
	register char  *seg1;
	register char  *seg2;
	register char  *seg2p;
	register int    loop;
	uint            offset;

	begin_stack[0] = (char *) base;
	end_stack[0]   = (char *) base + ((nmemb - 1) * siz);

	for (loop = 0; loop >= 0; --loop) {
		begin = begin_stack[loop];
		end   = end_stack[loop];

		while (begin < end) {
			offset = (end - begin) >> 1;
			_zend_qsort_swap(begin, begin + (offset - (offset % siz)), siz);

			seg1 = begin + siz;
			seg2 = end;

			while (1) {
				for (; seg1 < seg2 && compare(begin, seg1 TSRMLS_CC, arg) > 0;
				     seg1 += siz);

				for (; seg2 >= seg1 && compare(seg2, begin TSRMLS_CC, arg) > 0;
				     seg2 -= siz);
				
				if (seg1 >= seg2)
					break;
				
				_zend_qsort_swap(seg1, seg2, siz);

				seg1 += siz;
				seg2 -= siz;
			}

			_zend_qsort_swap(begin, seg2, siz);

			seg2p = seg2;
			
			if ((seg2p - begin) <= (end - seg2p)) {
				if ((seg2p + siz) < end) {
					begin_stack[loop] = seg2p + siz;
					end_stack[loop++] = end;
				}
				end = seg2p - siz;
			}
			else {
				if ((seg2p - siz) > begin) {
					begin_stack[loop] = begin;
					end_stack[loop++] = seg2p - siz;
				}
				begin = seg2p + siz;
			}
		}
	}
}

ZEND_API void zend_qsort(void *base, size_t nmemb, size_t siz, compare_func_t compare TSRMLS_DC)
{
	zend_qsort_r(base, nmemb, siz, (compare_r_func_t)compare, NULL TSRMLS_CC);
}

/* 
 * Local Variables:
 * c-basic-offset: 4 
 * tab-width: 4
 * End:
 * vim600: fdm=marker
 * vim: noet sw=4 ts=4
 */

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