testqsort.c
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/*
Copyright (C) 1997-2018 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
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, "%llx", &seed);
else
success = SDL_sscanf(argv[1], "%llu", &seed);
if (!success)
{
SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Invalid seed. Use a decimal or hexadecimal number.\n");
return 1;
}
if (seed <= 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: */
SDL_test.h
SDL_qsort
#define SDL_qsort
Definition: SDL_dynapi_overrides.h:380
main
int main(int argc, char *argv[])
Definition: testqsort.c:45
test_sort
static void test_sort(const char *desc, int *nums, const int arraylen)
Definition: testqsort.c:24
Uint64
uint64_t Uint64
Definition: SDL_stdinc.h:194
SDLTest_RandomInit
void SDLTest_RandomInit(SDLTest_RandomContext *rndContext, unsigned int xi, unsigned int ci)
Initialize random number generator with two integers.
Definition: SDL_test_random.c:41
iteration
static void iteration()
Definition: testaudiohotplug.c:84
SDL_LogError
#define SDL_LogError
Definition: SDL_dynapi_overrides.h:36
SDL_Log
#define SDL_Log
Definition: SDL_dynapi_overrides.h:31
SDLTest_RandomContext::c
unsigned int c
Definition: SDL_test_random.h:62
val
GLuint GLfloat * val
Definition: SDL_opengl_glext.h:1492
SDLTest_RandomInitTime
void SDLTest_RandomInitTime(SDLTest_RandomContext *rndContext)
Initialize random number generator based on current system time.
Definition: SDL_test_random.c:65
SDLTest_RandomContext::x
unsigned int x
Definition: SDL_test_random.h:61
SDL_sscanf
#define SDL_sscanf
Definition: SDL_dynapi_overrides.h:39
SDLTest_RandomContext
Definition: SDL_test_random.h:59
i
return Display return Display Bool Bool int int int return Display XEvent Bool(*) XPointer return Display return Display Drawable _Xconst char unsigned int unsigned int return Display Pixmap Pixmap XColor XColor unsigned int unsigned int return Display _Xconst char char int char return Display Visual unsigned int int int char unsigned int unsigned int in i)
Definition: SDL_x11sym.h:50
SDLTest_RandomInt
#define SDLTest_RandomInt(c)
Definition: SDL_test_random.h:54
SDL_arraysize
#define SDL_arraysize(array)
Definition: SDL_stdinc.h:93
num_compare
static int num_compare(const void *_a, const void *_b)
Definition: testqsort.c:16
a
GLboolean GLboolean GLboolean GLboolean a
Definition: SDL_opengl_glext.h:1109
b
GLboolean GLboolean GLboolean b
Definition: SDL_opengl_glext.h:1109
SDL_LOG_CATEGORY_APPLICATION
Definition: SDL_log.h:66