>>>>> Paul Kelly <[EMAIL PROTECTED]> writes:
>>> For this feature to be of real use, you need to allow MASK_OVERRIDE
>>> to be used to disable reading a mask altogether. E.g. if
>>> MASK_OVERRIDE is defined but empty, no mask should be used rather
>>> than falling back to MASK. This would allow the GUI to operate
>>> without a mask even when MASK has been created via the command
>>> line.
[...]
>> It seems to be usual in the Unix world to ignore the environment
>> variable's value if it's an empty string. Using a non-existing
>> raster (say, `.') is probably a better idea.
> On Windows, an environment variable is unset by setting it to an
> empty string. There seems to be no difference between the two. So I
> don't think we could rely on the behaviour caused by MASK_OVERRIDE
> being an empty string.
If it's so, there should probably a GRASS-wide policy on
ignoring environment variables set to an empty string. Why not
a libgis function?
const char *
getenv_nonempty (const char *name)
{
const char *value = getenv (name);
return (value && *value != '\0') ? value : 0;
}
> OTOH setting it to some garbage value seems a little unelegant, but
> as long as it's not a valid raster name there should be no problem I
> suppose.
I'm still open to suggestions.
If none, I'd probably add a `.'-check to the code in order to
avoid a bogus warning.
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