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66 lines
1.5 KiB
C
66 lines
1.5 KiB
C
/*
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** qsort.c
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**
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** 1998.12.09, Ullrich von Bassewitz
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** 2015-06-21, Greg King
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*/
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#include <stdlib.h>
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static void QuickSort (register unsigned char* Base, int Lo, int Hi,
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register size_t Size,
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int __fastcall__ (* Compare) (const void*, const void*))
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/* Internal recursive function. Works with ints, but this shouldn't be
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** a problem.
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*/
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{
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int I, J;
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/* Quicksort */
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while (Hi > Lo) {
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I = Lo + Size;
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J = Hi;
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while (I <= J) {
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while (I <= J && Compare (Base + Lo, Base + I) >= 0) {
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I += Size;
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}
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while (I <= J && Compare (Base + Lo, Base + J) < 0) {
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J -= Size;
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}
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if (I <= J) {
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_swap (Base + I, Base + J, Size);
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I += Size;
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J -= Size;
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}
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}
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if (J != Lo) {
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_swap (Base + J, Base + Lo, Size);
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}
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if (((unsigned) J) * 2 > (Hi + Lo)) {
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QuickSort (Base, J + Size, Hi, Size, Compare);
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Hi = J - Size;
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} else {
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QuickSort (Base, Lo, J - Size, Size, Compare);
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Lo = J + Size;
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}
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}
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}
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void __fastcall__ qsort (void* base, size_t nmemb, size_t size,
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int __fastcall__ (* compare) (const void*, const void*))
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/* Quicksort implementation */
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{
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if (nmemb > 1) {
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QuickSort (base, 0, (nmemb-1) * size, size, compare);
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}
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}
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