- do not allow logger to write more than once per period

- fixed bug in statistics.c

logger.c

@@ -20,8 +20,9 @@ struct Logger {
   char *old;
   int oldsize;
   int period;
-  time_t last, lastWrite;
+  time_t last, lastWrite, omitTime;
   int numeric;
+  float omitValue;
   int exact;
   Logger *next;
 };
@@ -30,6 +31,7 @@ static char *dir = NULL;
 static Logger *list;
 static time_t lastLife = 0;
 static time_t lastWritten = 0;
+static time_t omitCheck = 0;
 /*--------------------------------------------------------------------------*/
 char *LoggerName(Logger * log)
 {
@@ -238,6 +240,8 @@ int LoggerWrite(Logger * log, time_t now, int period, char *value)
   time_t h0;
   static int yday = -1;
   struct tm *tm;
+  char *valp;
+  char buf[32];
 
   int l;
   FILE *fil;
@@ -283,6 +287,25 @@ int LoggerWrite(Logger * log, time_t now, int period, char *value)
     if (fil)
       fclose(fil);
   }
+  if (now < log->last + log->period && strcmp(log->old, value) != 0) {
+    log->omitValue = strtod(value, &valp);
+    if (value != valp) {
+      log->omitTime = now;
+      return 1;
+    }
+  } else {
+    log->omitTime = 0;
+  }
+  if (now > omitCheck + 5) { /* check for omitted values only every 5 seconds */
+    for (p = list; p != NULL; p = p->next) {
+      if (p->omitTime > 0 && now > p->omitTime + p->period) {
+        snprintf(buf, sizeof buf, "%g", p->omitValue);
+        LoggerWrite0(p, p->omitTime, p->period, buf);
+        p->omitTime = 0;
+      }
+    }
+    omitCheck = now;
+  }
   return LoggerWrite0(log, now, period, value);
 }
 
@@ -398,6 +421,8 @@ Logger *LoggerMake(char *name, int period, int exact)
       t = lastLife + period;
     }
     LoggerWrite(log, t, period, "");    /* value was undefined since last life of server */
+  } else {
+    LoggerSetPeriod(log, period);
   }
   return log;
 }