mirror of
https://github.com/php/php-src.git
synced 2024-12-26 02:10:46 +08:00
128 lines
3.3 KiB
C
128 lines
3.3 KiB
C
/*
|
|
+----------------------------------------------------------------------+
|
|
| Zend Engine |
|
|
+----------------------------------------------------------------------+
|
|
| Copyright (c) 1998-2004 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 <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(void *base, size_t nmemb, size_t siz, compare_func_t compare 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) > 0;
|
|
seg1 += siz);
|
|
|
|
for (; seg2 >= seg1 && compare(seg2, begin TSRMLS_CC) > 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;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Local Variables:
|
|
* c-basic-offset: 4
|
|
* tab-width: 4
|
|
* End:
|
|
* vim600: fdm=marker
|
|
* vim: noet sw=4 ts=4
|
|
*/
|