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#include <fcntl.h> char _preserve_fncase (void);
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
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 (see section _use_lfn). This can be changed by either setting
_CRT0_FLAG_PRESERVE_FILENAME_CASE bit in the
_crt0_startup_flags variable (see section _crt0_startup_flags), or by
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
LFN is set to N on systems that support LFN. That
is because this is how filenames are stored in the DOS directory entries.
Zero when 8+3 filenames should be converted to lower-case, non-zero otherwise.
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