#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#ifdef WIN32

    #include <windows.h>

    #include <io.h>

#else

    #include <unistd.h>

    #include <sys/time.h>

    #include <pthread.h>

    #define  CRITICAL_SECTION   pthread_mutex_t

    #define  _vsnprintf         vsnprintf

#endif

//Log{

#define MAXLOGSIZE 100000000

#define ARRSIZE(x) (sizeof(x)/sizeof(x[0]))

#include <time.h>

#include <sys/timeb.h>

#include <stdarg.h>

char logfilename1[]="MyLog1.log";

char logfilename2[]="MyLog2.log";

char logstr[];

char datestr[];

char timestr[];

char mss[];

CRITICAL_SECTION cs_log;

FILE *flog;

#ifdef WIN32

void Lock(CRITICAL_SECTION *l) {

    EnterCriticalSection(l);

}

void Unlock(CRITICAL_SECTION *l) {

    LeaveCriticalSection(l);

}

#else

void Lock(CRITICAL_SECTION *l) {

    pthread_mutex_lock(l);

}

void Unlock(CRITICAL_SECTION *l) {

    pthread_mutex_unlock(l);

}

#endif

void LogV(const char *pszFmt,va_list argp) {

    struct tm *now;

    struct timeb tb;

    if (NULL==pszFmt||==pszFmt[]) return;

    if (-==_vsnprintf(logstr,ARRSIZE(logstr),pszFmt,argp)) logstr[ARRSIZE(logstr)-]=;

    ftime(&tb);

    now=localtime(&tb.time);

    sprintf(datestr,"%04d-%02d-%02d",now->tm_year+,now->tm_mon+,now->tm_mday);

    sprintf(timestr,"%02d:%02d:%02d",now->tm_hour     ,now->tm_min  ,now->tm_sec );

    sprintf(mss,"%03d",tb.millitm);

    printf("%s %s.%s %s",datestr,timestr,mss,logstr);

    flog=fopen(logfilename1,"a");

    if (NULL!=flog) {

        fprintf(flog,"%s %s.%s %s",datestr,timestr,mss,logstr);

        if (ftell(flog)>MAXLOGSIZE) {

            fclose(flog);

            if (rename(logfilename1,logfilename2)) {

                remove(logfilename2);

                rename(logfilename1,logfilename2);

            }

            flog=fopen(logfilename1,"a");

            if (NULL==flog) return;

        }

        fclose(flog);

    }

}

void Log(const char *pszFmt,...) {

    va_list argp;

    Lock(&cs_log);

    va_start(argp,pszFmt);

    LogV(pszFmt,argp);

    va_end(argp);

    Unlock(&cs_log);

}

//Log}

int main(int argc,char * argv[]) {

    int i;

#ifdef WIN32

    InitializeCriticalSection(&cs_log);

#else

    pthread_mutex_init(&cs_log,NULL);

#endif

    for (i=;i<;i++) {

        Log("This is a Log %04d from FILE:%s LINE:%d\n",i, __FILE__, __LINE__);

    }

#ifdef WIN32

    DeleteCriticalSection(&cs_log);

#else

    pthread_mutex_destroy(&cs_log);

#endif

    return ;

}