#define SIZE_MAX               2048 //16777216             //1024*1024*16=16M
#define LINE_MAX               100  //1000
#define LOG_FILE_PATH          "./mylog.txt"        //日志文件路径
//#define LOG_PARAMS             LOG_FILE_PATH,__FILE__,__func__,__LINE__ //日志文件路径 调用函数所在文件 调用函数名 调用debugInfo时所在行号

#define LOG_PARAMS             LOG_FILE_PATH,"","","" 
//显示调用debugInfo接口的函数所在的文件名、函数名、行号
//调用举例：  debuInfo(LOG_PARAMS, “some string %s, some int %d and so on", "hello log", 101);

#define DEBUG
#ifdef DEBUG
int debugInfo(char *pLogPath, char *pFile, const char *pFuncName, int iLineNumb, char *fmt, ...);
#define DBGLog(fmt, args...) debugInfo(LOG_PARAMS, fmt, ##args) 
#else
#define DBGLog(fmt, args...) do{}while(0)
#endif

unsigned int curr_log_change_flag = 0;
unsigned int last_log_change_flag = 0;
unsigned char log_change_busy = 0;

//日志的编号
int giInfoNumb = 1;
int debugInfo(char *pLogPath, char *pFile, const char *pFuncName, int iLineNumb, char *fmt, ...)
{
    if(NULL == pLogPath ||'\0' == pLogPath[0] || NULL == pFile || '\0' == pFile[0] || NULL == pFuncName ||'\0' == pFuncName[0])
        return VS_ERR;
    //判断文件大小是否清空该文件，每1000次写日志里检测1次文件大小
    if(0 == (giInfoNumb % LINE_MAX))
    {
        struct stat fileStat;
        if(0 == stat(pLogPath, &fileStat) && fileStat.st_size > SIZE_MAX)
            remove(pLogPath);
    }
    //打开文件，写入日志
    FILE *pLogHandle = fopen(pLogPath, "a+");
    if(NULL == pLogHandle)
        return VS_ERR;
    log_change_busy = 1;
    //写入日期、函数信息
    time_t timeSecs = time(NULL);
    struct tm *timeInfo = localtime(&timeSecs);
    char acTitle[STR_LEN_2048] = { 0 };
#if 0    
    snprintf(acTitle, sizeof(acTitle), "[%04d] [%d%02d%02d/%02d:%02d:%02d] [%s] [%s:%d]\n", giInfoNumb++,
             timeInfo->tm_year + 1900, timeInfo->tm_mon + 1, timeInfo->tm_mday, 
             timeInfo->tm_hour, timeInfo->tm_min, timeInfo->tm_sec, pFile, pFuncName, iLineNumb);
#else
    snprintf(acTitle, sizeof(acTitle), "[%03d] [%d%02d%02d/%02d:%02d:%02d] ", giInfoNumb++,
            timeInfo->tm_year + 1900, timeInfo->tm_mon + 1, timeInfo->tm_mday, 
            timeInfo->tm_hour, timeInfo->tm_min, timeInfo->tm_sec); 
#endif
    int iLen = strlen(acTitle);
    fwrite(acTitle, iLen, 1, pLogHandle);
    //写入日志
    //fwrite("\t\t\t", 3, 1, pLogHandle);
    memset(acTitle, 0, sizeof(acTitle));
    va_list args;
    va_start(args, fmt);
    vsnprintf(acTitle, sizeof(acTitle), fmt, args);
    va_end(args);
    iLen = strlen(acTitle);
    fwrite(acTitle, iLen, 1, pLogHandle);
    fwrite("\n", 1, 1, pLogHandle);
    //关闭日志文件
    fclose(pLogHandle);
    curr_log_change_flag++;
	log_change_busy = 0;
    return VS_OK;
}