[rrd-developers] Re: rrd_graph.c: draw_horizontal_grid(), im->maxval=NaN(0xfffffffffffff)

[Stanislav Sinyagin]

here's where pixie becomes infinite: 

Starting program: /usr/local/rrdtool-1.1.0/bin/rrdtool graph /tmp/aaaa.png --imgformat=PNG
--width=500 --height=400 DEF:A=/tmp/getdim-23809.rrd:A:AVERAGE LINE1:A#000000

Breakpoint 1, ytr (im=0xffbec968, value=NaN(0xfffffffffffff))
    at rrd_graph.c:137
137         if (isnan(value)){
(gdb) p value
$1 = NaN(0xfffffffffffff)
(gdb) where
#0  ytr (im=0xffbec968, value=NaN(0xfffffffffffff)) at rrd_graph.c:137
#1  0x273bc in apply_gridfit (im=0xffbec968) at rrd_graph.c:447
#2  0x304b8 in graph_paint (im=0xffbec968, calcpr=0xffbed1f0)
    at rrd_graph.c:2256
#3  0x32a78 in rrd_graph (argc=7, argv=0xffbefb28, prdata=0xffbed1f0, 
    xsize=0xffbed1f8, ysize=0xffbed1fc) at rrd_graph.c:2598
#4  0x1c734 in HandleInputLine (argc=8, argv=0xffbefb24, out=0xff340294)
    at rrd_tool.c:591
#5  0x1b474 in main (argc=8, argv=0xffbefb24) at rrd_tool.c:364
(gdb) n
138           if(!im->logarithmic)
(gdb) 
139             pixie = (double) im->ysize / (im->maxval - im->minval);
(gdb) p im->maxval 
$2 = 2.4999999999986337e-312
(gdb) p (im->maxval - im->minval)
$3 = 5.00000000001703e-313
(gdb) p im->ysize
$4 = 400
(gdb) n
142           yval = im->yorigin;
(gdb) p pixie
$5 = Infinity

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