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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Minios-devel] [UNIKRAFT PATCH 1/2] lib/nolib: Add qsort
This qsort implementation is an adapted version of android bionic's
qsort. It is the Qsort routine from Bentley & McIlroy's "Engineering
a Sort Function".
Signed-off-by: Vlad-Andrei BĂDOIU <vlad_andrei.badoiu@xxxxxxxxxxxxxxx>
---
lib/nolibc/Makefile.uk | 3 +
lib/nolibc/exportsyms.uk | 1 +
lib/nolibc/include/stdlib.h | 3 +
lib/nolibc/qsort.c | 157 ++++++++++++++++++++++++++++++++++++
4 files changed, 164 insertions(+)
create mode 100644 lib/nolibc/qsort.c
diff --git a/lib/nolibc/Makefile.uk b/lib/nolibc/Makefile.uk
index 7cb2e7d1..9d4a9ec3 100644
--- a/lib/nolibc/Makefile.uk
+++ b/lib/nolibc/Makefile.uk
@@ -35,5 +35,8 @@ LIBNOLIBC_SRCS-y += $(LIBNOLIBC_BASE)/sscanf.c
LIBNOLIBC_SRCS-y += $(LIBNOLIBC_BASE)/asprintf.c
LIBNOLIBC_SRCS-$(CONFIG_LIBUKALLOC) += $(LIBNOLIBC_BASE)/malloc.c
+
+LIBNOLIBC_SRCS-y += $(LIBNOLIBC_BASE)/qsort.c
+
# Localize internal symbols (starting with __*)
LIBNOLIBC_OBJCFLAGS-y += -w -L __*
diff --git a/lib/nolibc/exportsyms.uk b/lib/nolibc/exportsyms.uk
index 675dadc1..663a9b0c 100644
--- a/lib/nolibc/exportsyms.uk
+++ b/lib/nolibc/exportsyms.uk
@@ -45,6 +45,7 @@ strtoul
strtoll
strtoull
atoi
+qsort
# string
memcpy
diff --git a/lib/nolibc/include/stdlib.h b/lib/nolibc/include/stdlib.h
index 02dd8500..b7175ced 100644
--- a/lib/nolibc/include/stdlib.h
+++ b/lib/nolibc/include/stdlib.h
@@ -86,6 +86,9 @@ int posix_memalign(void **memptr, size_t align, size_t size);
void *memalign(size_t align, size_t size);
#endif /* CONFIG_LIBUKALLOC */
+void qsort(void *base, size_t nmemb, size_t size,
+ int (*compar)(const void *, const void *));
+
#if CONFIG_LIBPOSIX_PROCESS
int system(const char *command);
#endif
diff --git a/lib/nolibc/qsort.c b/lib/nolibc/qsort.c
new file mode 100644
index 00000000..d8b3ddc5
--- /dev/null
+++ b/lib/nolibc/qsort.c
@@ -0,0 +1,157 @@
+/* $OpenBSD: qsort.c,v 1.10 2005/08/08 08:05:37 espie 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 <stdlib.h>
+static inline char *med3(char *, char *, char *, int (*)
+ (const void *, const void *));
+static inline void swapfunc(char *, char *, int, 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) { \
+ long i = (n) / sizeof(TYPE); \
+ TYPE *pi = (TYPE *) (parmi); \
+ TYPE *pj = (TYPE *) (parmj); \
+ do { \
+ TYPE t = *pi; \
+ *pi++ = *pj; \
+ *pj++ = t; \
+ } while (--i > 0); \
+}
+#define SWAPINIT(a, es) (swaptype = ((char *)a - (char *)0) % sizeof(long) || \
+ es % sizeof(long) ? 2 : es == sizeof(long) ? 0 : 1)
+static inline void
+swapfunc(char *a, char *b, int n, int swaptype)
+{
+ if (swaptype <= 1)
+ swapcode(long, a, b, n)
+ else
+ swapcode(char, a, b, n)
+}
+#define swap(a, b) \
+ do { \
+ if (swaptype == 0) { \
+ long t = *(long *)(a); \
+ *(long *)(a) = *(long *)(b); \
+ *(long *)(b) = t; \
+ } else \
+ swapfunc(a, b, es, swaptype); \
+ } while (0)
+
+#define vecswap(a, b, n) \
+ do { \
+ if ((n) > 0) \
+ swapfunc(a, b, n, swaptype); \
+ } while (0)
+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));
+}
+void
+qsort(void *aa, size_t n, size_t es, int (*cmp)(const void *, const void *))
+{
+ char *pa, *pb, *pc, *pd, *pl, *pm, *pn;
+ int d, r, swaptype, swap_cnt;
+ char *a = aa;
+loop:
+ SWAPINIT(a, es);
+ swap_cnt = 0;
+ 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 && (r = cmp(pb, a)) <= 0) {
+ if (r == 0) {
+ swap_cnt = 1;
+ swap(pa, pb);
+ pa += es;
+ }
+ pb += es;
+ }
+ while (pb <= pc && (r = cmp(pc, a)) >= 0) {
+ if (r == 0) {
+ swap_cnt = 1;
+ swap(pc, pd);
+ pd -= es;
+ }
+ pc -= es;
+ }
+ if (pb > pc)
+ break;
+ swap(pb, pc);
+ swap_cnt = 1;
+ pb += es;
+ pc -= es;
+ }
+ if (swap_cnt == 0) { /* Switch to insertion sort */
+ 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;
+ }
+ pn = (char *)a + n * es;
+ r = min(pa - (char *)a, pb - pa);
+ vecswap(a, pb - r, r);
+ r = min(pd - pc, pn - pd - (int)es);
+ vecswap(pb, pn - r, r);
+ if ((r = pb - pa) > (int)es)
+ qsort(a, r / es, es, cmp);
+ if ((r = pd - pc) > (int)es) {
+ /* Iterate rather than recurse to save stack space */
+ a = pn - r;
+ n = r / es;
+ goto loop;
+ }
+}
--
2.20.1
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