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/* MIT License
*
* Copyright (c) 2023 Tyge Løvset
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#ifndef STC_CSORT_H_INCLUDED
#define STC_CSORT_H_INCLUDED
#include <stdint.h>
#define c_CONCAT(a, b) a ## b
#define c_PASTE(a, b) c_CONCAT(a, b)
#endif
/* Generic Quicksort in C, performs as fast as c++ std::sort().
template params:
#define i_val - value type [required]
#define i_less - less function. default: *x < *y
#define i_tag NAME - define csort_NAME(). default {i_val}
// test:
#include <stdio.h>
#include <time.h>
#include <stdlib.h>
#define i_val int
#include <stc/algo/csort.h>
#include <stc/crandom.h>
#ifdef __cplusplus
#include <algorithm>
#endif
int testsort(csortval_int *a, size_t size, const char *desc) {
clock_t t = clock();
#ifdef __cplusplus
printf("std::sort: ");
std::sort(a, a + size);
#else
printf("csort: ");
csort_int(a, size);
#endif
t = clock() - t;
printf("%s: %zu elements sorted in %.3fms\n",
desc, size, t * 1000.0 / CLOCKS_PER_SEC);
return 0;
}
int main(int argc, char *argv[]) {
size_t i, size = argc > 1 ? strtoull(argv[1], NULL, 0) : 10000000;
csortval_int *a = (csortval_int*)malloc(sizeof(*a) * size);
if (a != NULL) {
for (i = 0; i < size; i++)
a[i] = crandom() & (1U << 28) - 1;
testsort(a, size, "random");
for (i = 0; i < 20; i++) printf(" %d", a[i]);
puts("");
testsort(a, size, "sorted");
for (i = 0; i < size; i++) a[i] = size - i;
testsort(a, size, "reverse sorted");
for (i = 0; i < size; i++) a[i] = 126735;
testsort(a, size, "constant");
free(a);
}
return 0;
}*/
#ifndef i_tag
#define i_tag i_val
#endif
#ifndef i_less
#define i_less(x, y) *x < *y
#endif
typedef i_val c_PASTE(csortval_, i_tag);
static inline void c_PASTE(cisort_, i_tag)(i_val arr[], intptr_t low, intptr_t high) {
for (intptr_t j = low, i = low+1; i <= high; j = i, ++i) {
i_val key = arr[i];
while (j >= 0 && (i_less((&key), (&arr[j])))) {
arr[j + 1] = arr[j];
--j;
}
arr[j + 1] = key;
}
}
static inline void c_PASTE(cqsort_, i_tag)(i_val arr[], intptr_t low, intptr_t high)
{
intptr_t i = low, j = high;
i_val pivot = arr[(i + j)/2];
while (i <= j) {
while (i_less((&arr[i]), (&pivot))) ++i;
while (i_less((&pivot), (&arr[j]))) --j;
if (i <= j) {
i_val t = arr[i]; arr[i] = arr[j]; arr[j] = t;
++i; --j;
}
}
if (j > low) j - low < 65 ? c_PASTE(cisort_, i_tag)(arr, low, j)
: c_PASTE(cqsort_, i_tag)(arr, low, j);
if (i < high) high - i < 65 ? c_PASTE(cisort_, i_tag)(arr, i, high)
: c_PASTE(cqsort_, i_tag)(arr, i, high);
}
static inline void c_PASTE(csort_, i_tag)(i_val arr[], size_t elements)
{
elements < 65 ? c_PASTE(cisort_, i_tag)(arr, 0, (intptr_t)elements - 1)
: c_PASTE(cqsort_, i_tag)(arr, 0, (intptr_t)elements - 1);
}
#undef i_tag
#undef i_val
#undef i_less
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