To: djgpp-workers AT delorie DOT com
Message-Id: <2.7.9.ZOFT.H4JNYR@pauzner.dnttm.ru>
From: "Leonid Pauzner" <uue AT pauzner DOT dnttm DOT ru>
Date: Fri, 25 Oct 2002 19:49:39 +0400 (MSD)
X-Mailer: dMail [Demos Mail for DOS v2.7.9]
Subject: _use_lfn() and _preserve_fncase()  implementation
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Reply-To: djgpp-workers AT delorie DOT com

I found out that _use_lfn() have non zero weight, according to the profile:


                0.00    0.00      27/40929       _chmod [208]
                0.01    0.00    4070/40929       _truename [62]
                0.01    0.00    4088/40929       _fixpath [36]
                0.01    0.00    4090/40929       __findfirst [66]
                0.01    0.00    4115/40929       __findnext [129]
                0.03    0.02   24497/40929       _lfn_gen_short_fname [95]
[58]     0.6    0.06    0.03   40929         _use_lfn [58]
                0.03    0.00    4090/8256        getenv [79]
                0.00    0.00    4089/4089        _get_volume_info [323]
-----------------------------------------------

I wonder why _use_lfn repeatedly calls getenv() and _get_volume_info().
Not a big overhead but could this be improved?

Function calls with 0 arg ( _USE_LFN macro)
mixed with nonzero arg from __fixpath()

Also, numerous getenv() calls occured from _preserve_fncase()
which called in turn from _fixpath().

Numbers doesn't change whether $LFN env is set to 'y'/'n' or unset.
The program (kind of stat() on directory entries) runs on the same
DOS drive, and the $LFN env was not changed.


-----------------------------------------------
                0.00    0.00       3/4109        __getcwd [230]
                0.00    0.00      18/4109        opendir [176]
                0.00    0.03    4088/4109        _fixpath [36]
[103]    0.2    0.00    0.03    4109         _preserve_fncase [103]
                0.03    0.00    4109/8256        getenv [79]
-----------------------------------------------
                0.00    0.00      13/8256        __crt0_load_environment_file [148]
                0.00    0.00      18/8256        override_proxy [138]
                0.03    0.00    4090/8256        _use_lfn [58]
                0.03    0.00    4109/8256        _preserve_fncase [103]
[79]     0.4    0.06    0.00    8256         getenv [79]
                0.00    0.00      10/10          set_hash_env [284]
-----------------------------------------------
                                                 <spontaneous>
[36]     1.1    0.11    0.04                 _fixpath [36]
                0.00    0.03    4088/4109        _preserve_fncase [103]
                0.01    0.00    4088/40929       _use_lfn [58]
                0.00    0.00   20399/86646       strcmp [305]
-----------------------------------------------