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128 lines
3.3 KiB
C
128 lines
3.3 KiB
C
/*
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+----------------------------------------------------------------------+
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| Zend Engine |
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+----------------------------------------------------------------------+
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| Copyright (c) 1998-2007 Zend Technologies Ltd. (http://www.zend.com) |
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+----------------------------------------------------------------------+
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| This source file is subject to version 2.00 of the Zend license, |
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| that is bundled with this package in the file LICENSE, and is |
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| available through the world-wide-web at the following url: |
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| http://www.zend.com/license/2_00.txt. |
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| If you did not receive a copy of the Zend license and are unable to |
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| obtain it through the world-wide-web, please send a note to |
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| license@zend.com so we can mail you a copy immediately. |
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+----------------------------------------------------------------------+
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| Authors: Sterling Hughes <sterling@php.net> |
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+----------------------------------------------------------------------+
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*/
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/* $Id$ */
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#include "zend.h"
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#include <limits.h>
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#define QSORT_STACK_SIZE (sizeof(size_t) * CHAR_BIT)
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static void _zend_qsort_swap(void *a, void *b, size_t siz)
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{
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register char *tmp_a_char;
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register char *tmp_b_char;
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register int *tmp_a_int;
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register int *tmp_b_int;
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register size_t i;
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int t_i;
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char t_c;
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tmp_a_int = (int *) a;
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tmp_b_int = (int *) b;
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for (i = sizeof(int); i <= siz; i += sizeof(int)) {
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t_i = *tmp_a_int;
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*tmp_a_int++ = *tmp_b_int;
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*tmp_b_int++ = t_i;
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}
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tmp_a_char = (char *) tmp_a_int;
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tmp_b_char = (char *) tmp_b_int;
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for (i = i - sizeof(int) + 1; i <= siz; ++i) {
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t_c = *tmp_a_char;
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*tmp_a_char++ = *tmp_b_char;
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*tmp_b_char++ = t_c;
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}
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}
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ZEND_API void zend_qsort(void *base, size_t nmemb, size_t siz, compare_func_t compare TSRMLS_DC)
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{
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void *begin_stack[QSORT_STACK_SIZE];
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void *end_stack[QSORT_STACK_SIZE];
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register char *begin;
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register char *end;
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register char *seg1;
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register char *seg2;
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register char *seg2p;
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register int loop;
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uint offset;
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begin_stack[0] = (char *) base;
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end_stack[0] = (char *) base + ((nmemb - 1) * siz);
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for (loop = 0; loop >= 0; --loop) {
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begin = begin_stack[loop];
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end = end_stack[loop];
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while (begin < end) {
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offset = (end - begin) >> 1;
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_zend_qsort_swap(begin, begin + (offset - (offset % siz)), siz);
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seg1 = begin + siz;
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seg2 = end;
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while (1) {
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for (; seg1 < seg2 && compare(begin, seg1 TSRMLS_CC) > 0;
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seg1 += siz);
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for (; seg2 >= seg1 && compare(seg2, begin TSRMLS_CC) > 0;
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seg2 -= siz);
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if (seg1 >= seg2)
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break;
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_zend_qsort_swap(seg1, seg2, siz);
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seg1 += siz;
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seg2 -= siz;
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}
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_zend_qsort_swap(begin, seg2, siz);
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seg2p = seg2;
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if ((seg2p - begin) <= (end - seg2p)) {
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if ((seg2p + siz) < end) {
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begin_stack[loop] = seg2p + siz;
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end_stack[loop++] = end;
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}
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end = seg2p - siz;
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}
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else {
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if ((seg2p - siz) > begin) {
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begin_stack[loop] = begin;
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end_stack[loop++] = seg2p - siz;
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}
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begin = seg2p + siz;
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}
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}
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}
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}
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/*
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* Local Variables:
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* c-basic-offset: 4
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* tab-width: 4
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* End:
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* vim600: fdm=marker
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* vim: noet sw=4 ts=4
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*/
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