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_preserve_fncase
================

Syntax
------

     #include <fcntl.h>
     
     char _preserve_fncase (void);

Description
-----------

This function returns a non-zero value if letter-case in filenames
should be preserved.  It is used by library functions that get filenames
from the operating system (like `readdir', `_fixpath' and others).  The
usual behavior of these functions (when `_preserve_fncase' returns
zero) is to down-case 8+3 DOS-style filenames, but leave alone the
letter-case in long filenames when these are supported (*note
_use_lfn::.).  This can be changed by either setting
`_CRT0_FLAG_PRESERVE_FILENAME_CASE' bit in the `_crt0_startup_flags'
variable (_crt0_startup_flags:.), or by setting the `FNCASE'   
environment variable to `Y' at run time.  You might need such a setup
e.g. on Windows 95 if you want to see files with names like `README'
and `FAQ' listed in upper-case (for this to work, you will have to
manually rename all the other files with 8+3 DOS-style names to
lower-case names).  When the case in filenames is preserved, all
filenames will be returned in upper case on MSDOS (and other systems
that don't support long filenames), or if the environment variable
`LFN' is set to `N' on systems that support LFN.  That is because this
is how filenames are stored in the DOS directory entries.

Return value
------------

Zero when 8+3 filenames should be converted to lower-case, non-zero
otherwise.