[Mapserver-dev] Floating point precision problem in the WMS module

[Jean-Henry Berevoescu]

Hi,
I am experiencing a problem in the WMS module and I wonder
if there is are others who know about it.
Accessing MMS as a WMS Server the request gets parsed in
mapwms.c: msWMSLoadGetMapParams(...)

...
      map->extent.minx = atof(tokens[0]);
      map->extent.miny = atof(tokens[1]);
      map->extent.maxx = atof(tokens[2]);
      map->extent.maxy = atof(tokens[3]);
...

I send the WMS request with a BBOX having 10-11 digits after the decimal
points for the coordinates. Just before this part of the code I added a log
print and the BBOX coordinates are still all right (altough still as 
strings)
Doing the same with the value that get into the "extent", I get all the
coordinates truncated to 6 digits after the decimal point. It is as if
a double gets downsized to a float.
The extent structure has doubles so the problem is not that.
I also tried to replace "atof" with calls to strod or sscanf and the
results are identical.

Thanks in advance for any insights on how to solve this problem.

Jean