C Log System

#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&gt
    ; #define CRITICAL_SECTION pthread_mutex_t #define _VSNPRINTF vsnprintf #endif//log{#define MAXLOGSIZE 200 00000 #define Maxlinsize 16000 #include <time.h> #include <sys/timeb.h> #include <stdarg.h> char logfil
Ename1[]= "MyLog1.log";
Char logfilename2[]= "MyLog2.log";
static Char logstr[maxlinsize+1];
Char datestr[16];
Char timestr[16];
Char mss[4];
Critical_section Cs_log;
FILE *flog; #ifdef WIN32 void Lock (critical_section *l) {entercriticalsection (l);} void Unlock (critical_section *l) {Leavec
Riticalsection (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| |
    0==pszfmt[0]) return;
    _vsnprintf (LOGSTR,MAXLINSIZE,PSZFMT,ARGP);
    Ftime (&AMP;TB);
    Now=localtime (&tb.time);
    sprintf (Datestr, "%04d-%02d-%02d", now->tm_year+1900,now->tm_mon+1,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);
        }} else {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=0;i<10000;i++) {log ("The 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 0;
 }