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#include <limits.h>
#include <stddef.h>
#include <stdlib.h>
#include "generators.h"
static void generate_random(int *buffer, size_t size)
{
srandom(1);
for (size_t i = 0; i < size; i++) buffer[i] = random();
/* compress the values to nice small numbers to make debugging nicer */
#if 0
int maxcompressed = -1;
for (size_t compressed = 0; compressed < size; compressed++) {
size_t minidx = -1;
for (size_t i = 0; i < size; i++) {
if (maxcompressed < buffer[i] && (minidx >= size || buffer[i] < buffer[minidx]))
minidx = i;
}
buffer[minidx] = ++maxcompressed;
}
#endif
}
static void generate_sorted(int *buffer, size_t size)
{
for (size_t i = 0; i < size; i++) buffer[i] = i;
}
static void generate_reverse(int *buffer, size_t size)
{
for (size_t i = 0; i < size; i++) buffer[i] = size - i - 1;
}
static void generate_constant(int *buffer, size_t size)
{
for (size_t i = 0; i < size; i++) buffer[i] = 42;
}
static void add_noise(int *buffer, size_t size)
{
int noisemax = size / 4;
int noiseoff = size / 8;
srandom(1);
for (size_t i = 0; i < size; i++) {
if (random() < 0.2 * RAND_MAX) {
buffer[i] += random() % noisemax - noiseoff;
}
}
}
static void generate_sorted_noise(int *buffer, size_t size)
{
generate_sorted(buffer, size);
add_noise(buffer, size);
}
static void generate_reverse_noise(int *buffer, size_t size)
{
generate_reverse(buffer, size);
add_noise(buffer, size);
}
const struct generator generators[] = {
{ .name = "random", .func = generate_random },
{ .name = "sorted", .func = generate_sorted },
{ .name = "reverse", .func = generate_reverse },
{ .name = "constant", .func = generate_constant },
{ .name = "sorted+noise", .func = generate_sorted_noise },
{ .name = "reverse+noise", .func = generate_reverse_noise },
{ 0 }
};
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