kc3-lang/SDL/test/testqsort.c

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• Hash : 0479df53
  Author :
  Date : 2023-01-09T09:48:21
  

  Updated copyright for 2023

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• test/testqsort.c

• /*
    Copyright (C) 1997-2023 Sam Lantinga <slouken@libsdl.org>
  
    This software is provided 'as-is', without any express or implied
    warranty.  In no event will the authors be held liable for any damages
    arising from the use of this software.
  
    Permission is granted to anyone to use this software for any purpose,
    including commercial applications, and to alter it and redistribute it
    freely.
  */
  
  #include "SDL_test.h"
  
  static int SDLCALL
  num_compare(const void *_a, const void *_b)
  {
      const int a = *((const int *)_a);
      const int b = *((const int *)_b);
      return (a < b) ? -1 : ((a > b) ? 1 : 0);
  }
  
  static void
  test_sort(const char *desc, int *nums, const int arraylen)
  {
      int i;
      int prev;
  
      SDL_Log("test: %s arraylen=%d", desc, arraylen);
  
      SDL_qsort(nums, arraylen, sizeof(nums[0]), num_compare);
  
      prev = nums[0];
      for (i = 1; i < arraylen; i++) {
          const int val = nums[i];
          if (val < prev) {
              SDL_Log("sort is broken!");
              return;
          }
          prev = val;
      }
  }
  
  int main(int argc, char *argv[])
  {
      static int nums[1024 * 100];
      static const int itervals[] = { SDL_arraysize(nums), 12 };
      int iteration;
      SDLTest_RandomContext rndctx;
  
      if (argc > 1) {
          int success;
          Uint64 seed = 0;
          if (argv[1][0] == '0' && argv[1][1] == 'x') {
              success = SDL_sscanf(argv[1] + 2, "%" SDL_PRIx64, &seed);
          } else {
              success = SDL_sscanf(argv[1], "%" SDL_PRIu64, &seed);
          }
          if (!success) {
              SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Invalid seed. Use a decimal or hexadecimal number.\n");
              return 1;
          }
          if (seed <= ((Uint64)0xffffffff)) {
              SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Seed must be equal or greater than 0x100000000.\n");
              return 1;
          }
          SDLTest_RandomInit(&rndctx, (unsigned int)(seed >> 32), (unsigned int)(seed & 0xffffffff));
      } else {
          SDLTest_RandomInitTime(&rndctx);
      }
      SDL_Log("Using random seed 0x%08x%08x\n", rndctx.x, rndctx.c);
  
      for (iteration = 0; iteration < SDL_arraysize(itervals); iteration++) {
          const int arraylen = itervals[iteration];
          int i;
  
          for (i = 0; i < arraylen; i++) {
              nums[i] = i;
          }
          test_sort("already sorted", nums, arraylen);
  
          for (i = 0; i < arraylen; i++) {
              nums[i] = i;
          }
          nums[arraylen - 1] = -1;
          test_sort("already sorted except last element", nums, arraylen);
  
          for (i = 0; i < arraylen; i++) {
              nums[i] = (arraylen - 1) - i;
          }
          test_sort("reverse sorted", nums, arraylen);
  
          for (i = 0; i < arraylen; i++) {
              nums[i] = SDLTest_RandomInt(&rndctx);
          }
          test_sort("random sorted", nums, arraylen);
      }
  
      return 0;
  }
  
  /* vi: set ts=4 sw=4 expandtab: */
  
  

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