Extract average calculation in separated function

include/stats.h

  */
 int pyfcgi_stats_reqbuff(size_t);
 
+int pyfcgi_stats_avg(const int[], int*, int, int*, double[4]);
+
+/**@brief Returns the formated buffer
+ * @todo make @ref pyfcgi_stats_format() implement this functionnality
+ * to remove this function... */
 const char *pyfcgi_stats_buff(const char **, size_t*);
 
 #endif

src/stats.c

 		PACKAGE_STRING, uptime, since);
 
 	// Request counter stats formating
+	double avgs[4];
+	int last_rs, ret;
+
+	do
+	{
+		ret = pyfcgi_stats_avg(pyfcgi_stats.reqs,
+			&(pyfcgi_stats.cur_req), PYFCGI_STATS_REQS_SAMPLES,
+			&last_rs, avgs);
+	} while(ret < 0 && errno == EINTR);
+	pyfcgi_stats_buffprintf("Requests stats :\n1s:%dr/s 1m:%.2fr/s 5m:%.2fr/s 10m:%.2fr/s 15m:%.2fr/s\n",
+		last_rs, avgs[0], avgs[1], avgs[2], avgs[3]);
+	return pyfcgi_stats.buff_ptr;
+}
+
+int pyfcgi_stats_avg(const int data[], int *idx_first, int len,
+	int *last, double avgs[4])
+{
 	double r15, r10, r5, r1, rtmp;
 	unsigned long stmp; // stores a 60s req sum
-	int i, cur_req, cur_rs, idx;
+	int i, cur, idx, first;
 	r15 = r10 = r5 = r1 = stmp = 0;
-	cur_req = pyfcgi_stats.cur_req;
+	first = *idx_first;
 	//Block interrupt/ALARM ??
-	for(i=0; i<PYFCGI_STATS_REQS_SAMPLES; i++)
+	for(i=0; i<len; i++)
 	{
-		if(cur_req != pyfcgi_stats.cur_req)
+		if(first != *idx_first)
 		{
 			errno = EINTR;
-			return 0;
+			return -1;
 		}
-		idx = (pyfcgi_stats.cur_req - i - 1);
-		idx = (idx<0)?PYFCGI_STATS_REQS_SAMPLES + idx:idx;
-		idx %= PYFCGI_STATS_REQS_SAMPLES;
-		cur_rs = pyfcgi_stats.reqs[idx];
+		idx = (*idx_first- i - 1);
+		idx = (idx<0)?len + idx:idx;
+		idx %= len;
+		cur = data[idx];
 		if(!i || i%60)
 		{
-			stmp += cur_rs;
+			stmp += cur;
 			continue;
 		}
 		rtmp = (long double)stmp / 60;
 		if(i<5*60) { r5 += rtmp; }
 		if(i<10*60) { r10 += rtmp; }
 		if(i<15*60) { r15 += rtmp; }
-		stmp = cur_rs;
+		stmp = cur;
 	}
 	//Restore interrupt/ALARM ??
 	r5 /= 5;
 	r10 /= 10;
 	r15 /= 15;
-	pyfcgi_stats_buffprintf("Requests stats :\n1s:%dr/s 1m:%.2fr/s 5m:%.2fr/s 10m:%.2fr/s 15m:%.2fr/s\n",
-		pyfcgi_stats.reqs[pyfcgi_stats.cur_req-1], r1, r5, r10, r15);
-	return pyfcgi_stats.buff_ptr;
+	*last = data[*idx_first];
+	avgs[0] = r1;
+	avgs[1] = r5;
+	avgs[2] = r10;
+	avgs[3] = r15;
+
+	return 0;
 }
 
 void pyfcgi_stats_buffprintf(const char *fmt, ...)