+++ /dev/null
-/*
- * 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 "yportenv.h"
-/* #include <linux/string.h> */
-
-/*
- * Qsort routine from Bentley & McIlroy's "Engineering a Sort Function".
- */
-#define swapcode(TYPE, parmi, parmj, n) do { \
- long i = (n) / sizeof (TYPE); \
- register TYPE *pi = (TYPE *) (parmi); \
- register TYPE *pj = (TYPE *) (parmj); \
- do { \
- register TYPE t = *pi; \
- *pi++ = *pj; \
- *pj++ = t; \
- } while (--i > 0); \
-} while (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 yswap(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) if ((n) > 0) swapfunc(a, b, 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));
-}
-
-#ifndef min
-#define min(a, b) (((a) < (b)) ? (a) : (b))
-#endif
-
-void
-yaffs_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;
- register 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)
- yswap(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);
- }
- yswap(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;
- yswap(pa, pb);
- pa += es;
- }
- pb += es;
- }
- while (pb <= pc && (r = cmp(pc, a)) >= 0) {
- if (r == 0) {
- swap_cnt = 1;
- yswap(pc, pd);
- pd -= es;
- }
- pc -= es;
- }
- if (pb > pc)
- break;
- yswap(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)
- yswap(pl, pl - es);
- return;
- }
-
- pn = (char *)a + n * es;
- r = min(pa - (char *)a, pb - pa);
- vecswap(a, pb - r, r);
- r = min((long)(pd - pc), (long)(pn - pd - es));
- vecswap(pb, pn - r, r);
- r = pb - pa;
- if (r > es)
- yaffs_qsort(a, r / es, es, cmp);
- r = pd - pc;
- if (r > es) {
- /* Iterate rather than recurse to save stack space */
- a = pn - r;
- n = r / es;
- goto loop;
- }
-/* yaffs_qsort(pn - r, r / es, es, cmp);*/
-}
projects / yaffs2.git / blobdiff