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/* SPDX-License-Identifier: GPL-2.0-or-later
* Copyright 2013 Blender Foundation. All rights reserved. */
/** \file
* \ingroup bli
*/
#include <stdlib.h>
#if defined(__GLIBC__) && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 8))
/* do nothing! */
#else
# include "BLI_utildefines.h"
# include "BLI_sort.h"
# ifdef min /* For MSVC. */
# undef min
# endif
/* Maintained by FreeBSD. */
/* clang-format off */
/**
* qsort, copied from FreeBSD source.
* with only very minor edits, see:
* http://github.com/freebsd/freebsd/blob/master/sys/libkern/qsort.c
*
* \note modified to use glibc arg order for callbacks.
*/
BLI_INLINE char *med3(char *a, char *b, char *c, BLI_sort_cmp_t cmp, void *thunk);
BLI_INLINE void swapfunc(char *a, char *b, int n, int swaptype);
#define min(a, b) (a) < (b) ? (a) : (b)
#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;
BLI_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) \
if (swaptype == 0) { \
long t = *(long *)(a); \
*(long *)(a) = *(long *)(b);\
*(long *)(b) = t; \
} else \
swapfunc(a, b, es, swaptype)
#define vecswap(a, b, n) if ((n) > 0) swapfunc(a, b, n, swaptype)
#define CMP(t, x, y) (cmp((x), (y), (t)))
BLI_INLINE char *med3(char *a, char *b, char *c, BLI_sort_cmp_t cmp, void *thunk)
{
return CMP(thunk, a, b) < 0 ?
(CMP(thunk, b, c) < 0 ? b : (CMP(thunk, a, c) < 0 ? c : a )) :
(CMP(thunk, b, c) > 0 ? b : (CMP(thunk, a, c) < 0 ? a : c ));
}
/**
* Quick sort re-entrant.
*/
void BLI_qsort_r(void *a, size_t n, size_t es, BLI_sort_cmp_t cmp, void *thunk)
{
char *pa, *pb, *pc, *pd, *pl, *pm, *pn;
int d, r, swaptype, swap_cnt;
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(thunk, 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, thunk);
pm = med3(pm - d, pm, pm + d, cmp, thunk);
pn = med3(pn - 2 * d, pn - d, pn, cmp, thunk);
}
pm = med3(pl, pm, pn, cmp, thunk);
}
swap((char *)a, pm);
pa = pb = (char *)a + es;
pc = pd = (char *)a + (n - 1) * es;
for (;;) {
while (pb <= pc && (r = CMP(thunk, pb, a)) <= 0) {
if (r == 0) {
swap_cnt = 1;
swap(pa, pb);
pa += es;
}
pb += es;
}
while (pb <= pc && (r = CMP(thunk, 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(thunk, pl - es, pl) > 0;
pl -= es)
{
swap(pl, pl - es);
}
}
return;
}
pn = (char *)a + n * es;
r = min(pa - (char *)a, pb - pa);
vecswap((char *)a, pb - r, r);
r = min(pd - pc, pn - pd - es);
vecswap(pb, pn - r, r);
if ((r = pb - pa) > es) {
BLI_qsort_r(a, r / es, es, cmp, thunk);
}
if ((r = pd - pc) > es) {
/* Iterate rather than recurse to save stack space */
a = pn - r;
n = r / es;
goto loop;
}
}
/* clang-format on */
#endif /* __GLIBC__ */
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