You can (and probably should) use the same texmf.cnf
configuration file that Kpathsea uses for your program. This helps
installers by keeping all configuration in one place.
To retrieve a value var from config files, the best way is to call
kpse_var_value on the string var. This will look
first for an environment variable var, then a config file value.
The result will be the value found or `NULL'. This function is
declared in `kpathsea/variable.h'. For an example, see the
shell_escape code in `web2c/lib/texmfmp.c'.
The routine to do variable expansion in the context of a search path (as
opposed to simply retrieving a value) is kpse_var_expand, also
declared in `kpathsea/variable.h'. It's generally only necessary
to set the search path structure components as explained in the previous
section, rather than using this yourself.
If for some reason you want to retrieve a value only from a
config file, not automatically looking for a corresponding environment
variable, call kpse_cnf_get (declared in `kpathsea/cnf.h')
with the string var.
No initialization calls are needed.
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