#include "dat_paths.h"

#include <assert.h>
#include <stdio.h>
#include <string.h>
#ifdef _WIN32
#include <process.h>
#define test_pid _getpid
#else
#include <unistd.h>
#define test_pid getpid
#endif

static void write_text(const char *path, const char *text)
{
	FILE *file = fopen(path, "wb");
	assert(file);
	assert(fwrite(text, 1, strlen(text), file) == strlen(text));
	assert(fclose(file) == 0);
}

int main(void)
{
	char destination[256], temporary[256], contents[32];
	FILE *file;
	int n;
	n = snprintf(destination, sizeof(destination), "build/test-paths-%ld", (long)test_pid());
	assert(n > 0 && (size_t)n < sizeof(destination));
	n = snprintf(temporary, sizeof(temporary), "%s.tmp", destination);
	assert(n > 0 && (size_t)n < sizeof(temporary));
	write_text(destination, "before");
	write_text(temporary, "after");
	assert(dat_replace_file(temporary, destination) == 0);
	file = fopen(destination, "rb");
	assert(file);
	assert(fgets(contents, sizeof(contents), file));
	assert(fclose(file) == 0);
	assert(strcmp(contents, "after") == 0);
	assert(remove(destination) == 0);
	puts("user-state atomic replacement: PASS");
	return 0;
}