Message-ID:	<38BC0F27.25F413BF@teleline.es>
Date:	Tue, 29 Feb 2000 19:25:43 +0100
From:	Mariano Alvarez =?iso-8859-1?Q?Fern=E1ndez?= <malfer AT teleline DOT es>
X-Mailer:	Mozilla 4.5 [es] (Win95; I)
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MIME-Version:	1.0
To:	djgpp-workers AT delorie DOT com
Subject:	short file names when using LFN
Reply-To:	djgpp-workers AT delorie DOT com

Hello:

    Searching the Ralph Brown I found the interrupt to get the short
file name when using LFN. Here is the routine. Really I d'ont know very
much about the DJGPP internals, so I made the routine modifying the
"_gen_short_filename" one. It seem to work. It return the whole path, so
you must provide a short_fname variable for 128 bytes.

Now, I only need the put routine :-) I'm playing with a crazy idea:
do the copy, compare the short filenames
if they don't match rename the copied file adding .00n
do another copy and try again
when the short filenames match, delete the bad copies.
What do you think? It work by hand.

M.Alvarez

-- lfngsfn.c ----------------

/* Copyright (C) 2000 DJ Delorie, see COPYING.DJ for details */
#include <libc/stubs.h>
#include <ctype.h>
#include <string.h>
#include <fcntl.h>
#include <dpmi.h>
#include <go32.h>
#include <sys/movedata.h>

char *
_lfn_get_short_fname (const char *long_fname, char *short_fname)
{
  __dpmi_regs r;
  unsigned long tbuf = __tb;

  short_fname[0] = '\0';

  if (_USE_LFN)
    {
      dosmemput (long_fname, strlen (long_fname) + 1, tbuf);
      r.x.ax = 0x7160;
      r.x.ds = tbuf >> 4;
      r.x.si = 0;
      r.x.es = r.x.ds;
      r.x.di = 260;
      r.h.cl = 0x01;
      r.h.ch = 0x00;
      __dpmi_int (0x21, &r);

      if ((r.x.flags & 1) == 0 && r.x.ax != 0x7100)
       {
         dosmemget (tbuf + 260, 128, short_fname);
       }
    }

  return short_fname;
}

#ifdef TEST

#include <stdio.h>

int main (int argc, char *argv[])
{
  char sh[128];
  if (argc > 1)
    printf ("Long:  %s\nShort: %s\n",
            argv[1], _lfn_get_short_fname(argv[1], sh));
  return 0;
}

#endif

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