Adding upstream version 5:7.2.4.upstream/5%7.2.4

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 185 insertions, 0 deletions

diff --git a/src/pqsort.c b/src/pqsort.c
new file mode 100644
index 0000000..fab54e0
--- /dev/null
+++ b/src/pqsort.c
@@ -0,0 +1,185 @@
+/* The following is the NetBSD libc qsort implementation modified in order to
+ * support partial sorting of ranges for Redis.
+ *
+ * Copyright(C) 2009-2012 Salvatore Sanfilippo. All rights reserved.
+ *
+ * The original copyright notice follows. */
+
+
+/*	$NetBSD: qsort.c,v 1.19 2009/01/30 23:38:44 lukem Exp $	*/
+
+/*-
+ * Copyright (c) 1992, 1993
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/types.h>
+#include <stdint.h>
+#include <errno.h>
+#include <stdlib.h>
+
+static inline char	*med3 (char *, char *, char *,
+    int (*)(const void *, const void *));
+static inline void	 swapfunc (char *, char *, size_t, int);
+
+#define min(a, b)	(a) < (b) ? a : b
+
+/*
+ * Qsort routine from Bentley & McIlroy's "Engineering a Sort Function".
+ */
+#define swapcode(TYPE, parmi, parmj, n) { 		\
+	size_t i = (n) / sizeof (TYPE); 		\
+	TYPE *pi = (TYPE *)(void *)(parmi); 		\
+	TYPE *pj = (TYPE *)(void *)(parmj); 		\
+	do { 						\
+		TYPE	t = *pi;			\
+		*pi++ = *pj;				\
+		*pj++ = t;				\
+        } while (--i > 0);				\
+}
+
+#define SWAPINIT(a, es) swaptype = (uintptr_t)a % sizeof(long) || \
+	es % sizeof(long) ? 2 : es == sizeof(long)? 0 : 1;
+
+static inline void
+swapfunc(char *a, char *b, size_t n, int swaptype)
+{
+
+	if (swaptype <= 1)
+		swapcode(long, a, b, n)
+	else
+		swapcode(char, a, b, n)
+}
+
+#define swap(a, b)						\
+	if (swaptype == 0) {					\
+		long t = *(long *)(void *)(a);			\
+		*(long *)(void *)(a) = *(long *)(void *)(b);	\
+		*(long *)(void *)(b) = t;			\
+	} else							\
+		swapfunc(a, b, es, swaptype)
+
+#define vecswap(a, b, n) if ((n) > 0) swapfunc((a), (b), (size_t)(n), swaptype)
+
+static inline char *
+med3(char *a, char *b, char *c,
+    int (*cmp) (const void *, const void *))
+{
+
+	return cmp(a, b) < 0 ?
+	       (cmp(b, c) < 0 ? b : (cmp(a, c) < 0 ? c : a ))
+              :(cmp(b, c) > 0 ? b : (cmp(a, c) < 0 ? a : c ));
+}
+
+static void
+_pqsort(void *a, size_t n, size_t es,
+    int (*cmp) (const void *, const void *), void *lrange, void *rrange)
+{
+	char *pa, *pb, *pc, *pd, *pl, *pm, *pn;
+	size_t d, r;
+	int swaptype, cmp_result;
+
+loop:	SWAPINIT(a, es);
+	if (n < 7) {
+		for (pm = (char *) a + es; pm < (char *) a + n * es; pm += es)
+			for (pl = pm; pl > (char *) a && cmp(pl - es, pl) > 0;
+			     pl -= es)
+				swap(pl, pl - es);
+		return;
+	}
+	pm = (char *) a + (n / 2) * es;
+	if (n > 7) {
+		pl = (char *) a;
+		pn = (char *) a + (n - 1) * es;
+		if (n > 40) {
+			d = (n / 8) * es;
+			pl = med3(pl, pl + d, pl + 2 * d, cmp);
+			pm = med3(pm - d, pm, pm + d, cmp);
+			pn = med3(pn - 2 * d, pn - d, pn, cmp);
+		}
+		pm = med3(pl, pm, pn, cmp);
+	}
+	swap(a, pm);
+	pa = pb = (char *) a + es;
+
+	pc = pd = (char *) a + (n - 1) * es;
+	for (;;) {
+		while (pb <= pc && (cmp_result = cmp(pb, a)) <= 0) {
+			if (cmp_result == 0) {
+				swap(pa, pb);
+				pa += es;
+			}
+			pb += es;
+		}
+		while (pb <= pc && (cmp_result = cmp(pc, a)) >= 0) {
+			if (cmp_result == 0) {
+				swap(pc, pd);
+				pd -= es;
+			}
+			pc -= es;
+		}
+		if (pb > pc)
+			break;
+		swap(pb, pc);
+		pb += es;
+		pc -= es;
+	}
+
+	pn = (char *) a + n * es;
+	r = min(pa - (char *) a, pb - pa);
+	vecswap(a, pb - r, r);
+	r = min((size_t)(pd - pc), pn - pd - es);
+	vecswap(pb, pn - r, r);
+	if ((r = pb - pa) > es) {
+                void *_l = a, *_r = ((unsigned char*)a)+r-1;
+                if (!((lrange < _l && rrange < _l) ||
+                    (lrange > _r && rrange > _r)))
+		    _pqsort(a, r / es, es, cmp, lrange, rrange);
+        }
+	if ((r = pd - pc) > es) {
+                void *_l, *_r;
+
+		/* Iterate rather than recurse to save stack space */
+		a = pn - r;
+		n = r / es;
+
+                _l = a;
+                _r = ((unsigned char*)a)+r-1;
+                if (!((lrange < _l && rrange < _l) ||
+                    (lrange > _r && rrange > _r)))
+		    goto loop;
+	}
+/*		qsort(pn - r, r / es, es, cmp);*/
+}
+
+void
+pqsort(void *a, size_t n, size_t es,
+    int (*cmp) (const void *, const void *), size_t lrange, size_t rrange)
+{
+    _pqsort(a,n,es,cmp,((unsigned char*)a)+(lrange*es),
+                       ((unsigned char*)a)+((rrange+1)*es)-1);
+}