mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-18 18:59:44 +00:00
8bef79bf3c
These don't need to be in common.h so move them out into a new header. Also add some missing comments. Signed-off-by: Simon Glass <sjg@chromium.org> Reviewed-by: Tom Rini <trini@konsulko.com>
141 lines
3.1 KiB
C
141 lines
3.1 KiB
C
// SPDX-License-Identifier: BSD-3-Clause
|
|
/*
|
|
* Copyright (c) 1992, 1993
|
|
* The Regents of the University of California. All rights reserved.
|
|
*/
|
|
|
|
#include "yportenv.h"
|
|
#include <sort.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);*/
|
|
}
|