1 files changed, 127 insertions, 0 deletions
diff --git a/Zend/zend_qsort.c b/Zend/zend_qsort.c
new file mode 100644
index 0000000..bf17990
--- /dev/null
+++ b/Zend/zend_qsort.c
@@ -0,0 +1,127 @@
+/*
+   +----------------------------------------------------------------------+
+   | Zend Engine                                                          |
+   +----------------------------------------------------------------------+
+   | Copyright (c) 1998-2013 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
+ */