vasort

#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>

int cmp(const void *p1, const void *p2) {
  return *(int*)p1 - *(int*)p2;
}

void vaSort(int n, ...) {
  va_list va;
  va_start(va, n);

  int *arr = calloc(sizeof(int), n);
  if (arr == NULL) {
    perror("");
    exit(EXIT_FAILURE);
  }
  for (int i = 0; i < n; i++) {
    arr[i] = *va_arg(va, int*);
  }
  qsort(arr, n, sizeof(*arr), cmp);

  va_start(va, n);
  for (int i = 0; i < n; i++) {
    *va_arg(va, int*) = arr[i];
  }

  free(arr);
  va_end(va);
}

int main(int argc, char *argv[]) {
  int a = 2, b = 3, c = 1;
  vaSort(3, &a, &b, &c);
  printf("%d %d %d\n", a, b, c);
  return 0;
}