rrdtool1: modify logarithmic scale labelling

The y-axis graph labels in logarithmic mode display in 'scientific'
notation eg: '1e+00' for 0, '1e+01' for 10, '1e+02' for 100 and so on.
This IMO is a pain in the backside for non scientific humans to read.

Modified output to display numbers up to 99,999 in conventional decimal
format and to revert to scientific notation for larger, thus the same
display space is taken.

Signed-off-by: Kevin Darbyshire-Bryant <ldir@darbyshire-bryant.me.uk>

utils/rrdtool1/Makefile

@@ -9,7 +9,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=rrdtool1
 PKG_VERSION:=1.0.50
-PKG_RELEASE:=2
+PKG_RELEASE:=3
 
 PKG_BUILD_DIR:=$(BUILD_DIR)/rrdtool-$(PKG_VERSION)
 PKG_SOURCE:=rrdtool-$(PKG_VERSION).tar.gz

utils/rrdtool1/patches/040-no-e-notation-on-log-display.patch

@@ -0,0 +1,27 @@
+--- a/src/rrd_graph.c
++++ b/src/rrd_graph.c
+@@ -2049,7 +2049,7 @@ horizontal_log_grid(gdImagePtr gif, imag
+     char     graph_label[100];
+     gdPoint  polyPoints[4];
+     int      styleMinor[2],styleMajor[2];
+-    double   value, pixperstep, minstep;
++    double   value, pixperstep, minstep, yval;
+ 
+     /* find grid spaceing */
+     pixpex= (double)im->ysize / (log10(im->maxval) - log10(im->minval));
+@@ -2118,7 +2118,14 @@ horizontal_log_grid(gdImagePtr gif, imag
+ 	    
+ 	    gdImageLine(gif, polyPoints[0].x,polyPoints[0].y,
+ 			polyPoints[1].x,polyPoints[0].y,gdStyled);
+-	    sprintf(graph_label,"%3.0e",value * yloglab[majoridx][i]);
++	    yval = value * yloglab[majoridx][i];
++	    if (yval >= 100000) {
++		    sprintf(graph_label,"%3.0e", yval);
++	    } else {
++		    if (yval == 1) /* prints as 1e+00 */
++			yval = 0;
++		    sprintf(graph_label,"%5.0f", yval);
++	    }
+ 	    gdImageString(gif, SmallFont,
+ 			  (polyPoints[0].x - (strlen(graph_label) * 
+ 					      SmallFont->w)-7),