human-readable: also use it to format rate

Let's also simplify the code for rate in progress, and benefit from
same functionality.

progress.c

@@ -69,9 +69,8 @@ static unsigned long msdiff(struct timeval *t1, struct timeval *t2)
 static void rprint_progress(OFF_T ofs, OFF_T size, struct timeval *now, int is_last)
 {
 	char rembuf[64], eol[128];
-	const char *units;
 	unsigned long diff;
-	double rate, remain;
+	int64 rate, remain;
 	int pct;
 
 	if (is_last) {
@@ -93,41 +92,31 @@ static void rprint_progress(OFF_T ofs, OFF_T size, struct timeval *now, int is_l
 		/* Compute stats based on the starting info. */
 		if (!ph_start.time.tv_sec || !(diff = msdiff(&ph_start.time, now)))
 			diff = 1;
-		rate = (double) (ofs - ph_start.ofs) * 1000.0 / diff / 1024.0;
+		rate = (ofs - ph_start.ofs) * 1000 / diff;
 		/* Switch to total time taken for our last update. */
-		remain = (double) diff / 1000.0;
+		remain = diff;
 	} else {
 		strlcpy(eol, "  ", sizeof eol);
 		/* Compute stats based on recent progress. */
 		if (!(diff = msdiff(&ph_list[oldest_hpos].time, now)))
 			diff = 1;
-		rate = (double) (ofs - ph_list[oldest_hpos].ofs) * 1000.0 / diff / 1024.0;
-		remain = rate ? (double) (size - ofs) / rate / 1000.0 : 0.0;
+		rate = (ofs - ph_list[oldest_hpos].ofs) * 1000 / diff;
+		remain = rate ? (size - ofs) / rate : 0;
 	}
 
-	if (rate > 1024*1024) {
-		rate /= 1024.0 * 1024.0;
-		units = "GB/s";
-	} else if (rate > 1024) {
-		rate /= 1024.0;
-		units = "MB/s";
-	} else {
-		units = "kB/s";
-	}
-
-	if (remain < 0 || remain > 9999.0 * 3600.0)
+	if (remain < 0 || remain > (int64) 9999999 * 3600)
 		strlcpy(rembuf, "  ??:??:??", sizeof rembuf);
 	else {
 		snprintf(rembuf, sizeof rembuf, "%4u:%02u:%02u",
-			 (unsigned int) (remain / 3600.0),
-			 (unsigned int) (remain / 60.0) % 60,
+			 (unsigned int) (remain / 3600),
+			 (unsigned int) (remain / 60) % 60,
 			 (unsigned int) remain % 60);
 	}
 
 	output_needs_newline = 0;
 	pct = ofs == size ? 100 : (int) (100.0 * ofs / size);
-	rprintf(FCLIENT, "\r%15s %3d%% %7.2f%s %s%s",
-		human_num(ofs), pct, rate, units, rembuf, eol);
+	rprintf(FCLIENT, "\r%15s %3d%% %7sB/s %s%s",
+		human_num(ofs), pct, human_num(rate), rembuf, eol);
 	if (!is_last && !quiet) {
 		output_needs_newline = 1;
 		rflush(FCLIENT);