C 语言获取当前时间

#ifndef bl_time_h
#define bl_time_h

#include <stdint.h>

int64_t bl_time();

#endif

#include "bl_time.h"

#if defined(WIN32) && !defined(__cplusplus)
#define inline __inline
#endif

#ifdef WIN32
#include <Windows.h>
#else
#include <sys/time.h>
#endif

#ifdef WIN32
inline void set_low(int64_t* value, int low)    {
	*value &= (int64_t)0xffffffff << 32;
	*value |= (int64_t)(uint64_t)(uint32_t)low;
}

inline void set_high(int64_t* value, int high)    {
	*value &= (int64_t)(uint64_t)(uint32_t)0xffffffff;
	*value |= (int64_t)high << 32;
}

inline int64_t int64_t_from(int h, int l) {
	int64_t result = 0;
	set_high(&result, h);
	set_low(&result, l);
	return result;
}

static int64_t  _offset = 116444736000000000;

int64_t offset() {
	return _offset;
}

int64_t bl_time()
{
	FILETIME wt;
	GetSystemTimeAsFileTime(&wt);
	return (int64_t_from(wt.dwHighDateTime, wt.dwLowDateTime) - offset()) / 10000;
}
#else
int64_t bl_time()
{
	struct timeval tv;
	gettimeofday(&tv, NULL);
	return tv.tv_sec * (uint64_t)1000000 + tv.tv_usec;
}
#endif