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69 lines
1.2 KiB
C
69 lines
1.2 KiB
C
/*
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* qsort.c
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*
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* Ullrich von Bassewitz, 09.12.1998
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*/
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#include <stdlib.h>
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static void QuickSort (void* Base, int Lo, int Hi, size_t Size,
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int (*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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/* Get a char pointer */
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unsigned char* B = Base;
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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 (B + Lo, B + I) >= 0) {
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I += Size;
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}
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while (I <= J && Compare (B + Lo, B + J) < 0) {
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J -= Size;
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}
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if (I <= J) {
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_swap (B + I, B + 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 (B + J, B + 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 qsort (void* base, size_t nmemb, size_t size,
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int (*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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