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msvcrt: Rewrite qsort function.

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Piotr Caban 2014-05-21 11:57:13 +02:00 committed by Alexandre Julliard
parent f43a6d46da
commit b703afda86
1 changed files with 103 additions and 40 deletions
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143
dlls/msvcrt/misc.c
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@ -229,41 +229,108 @@ void CDECL _chkesp(void)
#endif /* __i386__ */
/*********************************************************************
* Helper function for MSVCRT_qsort_s.
*
* Based on NTDLL_qsort in dlls/ntdll/misc.c
*/
static void MSVCRT_mergesort( void *arr, void *barr, size_t elemsize,
int (CDECL *compar)(void *, const void *, const void *),
size_t left, size_t right, void *context )
static inline void swap(char *l, char *r, MSVCRT_size_t size)
{
if (right>left) {
size_t i, j, k, m;
m=left+(right-left)/2;
MSVCRT_mergesort(arr, barr, elemsize, compar, left, m, context);
MSVCRT_mergesort(arr, barr, elemsize, compar, m+1, right, context);
char tmp;
#define X(a,i) ((char*)a+elemsize*(i))
for (i=m+1; i>left; i--)
memcpy (X(barr,(i-1)),X(arr,(i-1)),elemsize);
for (j=m; j<right; j++)
memcpy (X(barr,(right+m-j)),X(arr,(j+1)),elemsize);
while(size--) {
tmp = *l;
*l++ = *r;
*r++ = tmp;
}
}
/* i=left; j=right; */
for (k=left; i<=m && j>m; k++) {
if (i==j || compar(context, X(barr,i),X(barr,j))<=0) {
memcpy(X(arr,k),X(barr,i),elemsize);
i++;
} else {
memcpy(X(arr,k),X(barr,j),elemsize);
j--;
}
static void small_sort(void *base, MSVCRT_size_t nmemb, MSVCRT_size_t size,
int (CDECL *compar)(void *, const void *, const void *), void *context)
{
MSVCRT_size_t e, i;
char *max, *p;
for(e=nmemb; e>1; e--) {
max = base;
for(i=1; i<e; i++) {
p = (char*)base + i*size;
if(compar(context, p, max) > 0)
max = p;
}
if(p != max)
swap(p, max, size);
}
}
static void quick_sort(void *base, MSVCRT_size_t nmemb, MSVCRT_size_t size,
int (CDECL *compar)(void *, const void *, const void *), void *context)
{
int stack_lo[8*sizeof(MSVCRT_size_t)], stack_hi[8*sizeof(MSVCRT_size_t)], stack_pos;
int beg, end, lo, hi, med;
stack_pos = 0;
stack_lo[stack_pos] = 0;
stack_hi[stack_pos] = nmemb-1;
#define X(i) ((char*)base+size*(i))
while(stack_pos >= 0) {
beg = stack_lo[stack_pos];
end = stack_hi[stack_pos--];
if(end-beg < 8) {
small_sort(X(beg), end-beg+1, size, compar, context);
continue;
}
lo = beg;
hi = end;
med = (hi+lo+1)/2;
if(compar(context, X(lo), X(med)) > 0)
swap(X(lo), X(med), size);
if(compar(context, X(lo), X(hi)) > 0)
swap(X(lo), X(hi), size);
if(compar(context, X(med), X(hi)) > 0)
swap(X(med), X(hi), size);
lo++;
hi--;
while(1) {
while(lo <= hi) {
if(lo!=med && compar(context, X(lo), X(med))>0)
break;
lo++;
}
while(med != hi) {
if(compar(context, X(hi), X(med)) <= 0)
break;
hi--;
}
if(hi < lo)
break;
swap(X(lo), X(hi), size);
if(hi == med)
med = lo;
lo++;
hi--;
}
while(hi > beg) {
if(hi!=med && compar(context, X(hi), X(med))!=0)
break;
hi--;
}
if(hi-beg >= end-lo) {
stack_lo[++stack_pos] = beg;
stack_hi[stack_pos] = hi;
stack_lo[++stack_pos] = lo;
stack_hi[stack_pos] = end;
}else {
stack_lo[++stack_pos] = lo;
stack_hi[stack_pos] = end;
stack_lo[++stack_pos] = beg;
stack_hi[stack_pos] = hi;
}
for (; i<=m; i++, k++)
memcpy(X(arr,k),X(barr,i),elemsize);
for (; j>m; j--, k++)
memcpy(X(arr,k),X(barr,j),elemsize);
}
#undef X
}
@ -271,13 +338,13 @@ static void MSVCRT_mergesort( void *arr, void *barr, size_t elemsize,
/*********************************************************************
* qsort_s (MSVCRT.@)
*
* Based on NTDLL_qsort in dlls/ntdll/misc.c
* This function is trying to sort data doing identical comparisons
* as native does. There are still cases where it behaves differently.
*/
void CDECL MSVCRT_qsort_s(void *base, MSVCRT_size_t nmemb, MSVCRT_size_t size,
int (CDECL *compar)(void *, const void *, const void *), void *context)
{
void *secondarr;
const size_t total_size = nmemb*size;
const MSVCRT_size_t total_size = nmemb*size;
if (!MSVCRT_CHECK_PMT(base != NULL || (base == NULL && nmemb == 0))) return;
if (!MSVCRT_CHECK_PMT(size > 0)) return;
@ -286,11 +353,7 @@ void CDECL MSVCRT_qsort_s(void *base, MSVCRT_size_t nmemb, MSVCRT_size_t size,
if (nmemb < 2) return;
secondarr = MSVCRT_malloc(total_size);
if (!secondarr)
return;
MSVCRT_mergesort(base, secondarr, size, compar, 0, nmemb-1, context);
MSVCRT_free(secondarr);
quick_sort(base, nmemb, size, compar, context);
}
/*********************************************************************
@ -299,7 +362,7 @@ void CDECL MSVCRT_qsort_s(void *base, MSVCRT_size_t nmemb, MSVCRT_size_t size,
void CDECL MSVCRT_qsort(void *base, MSVCRT_size_t nmemb, MSVCRT_size_t size,
int (CDECL *compar)(const void*, const void*))
{
return MSVCRT_qsort_s(base, nmemb, size, compare_wrapper, compar);
MSVCRT_qsort_s(base, nmemb, size, compare_wrapper, compar);
}
/*********************************************************************