libf2c/libU77/fnum_.c

   1 /* Copyright (C) 1995 Free Software Foundation, Inc.
   2 This file is part of GNU Fortran libU77 library.
   3
   4 This library is free software; you can redistribute it and/or modify it
   5 under the terms of the GNU Library General Public License as published
   6 by the Free Software Foundation; either version 2 of the License, or
   7 (at your option) any later version.
   8
   9 GNU Fortran is distributed in the hope that it will be useful,
  10 but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12 Library General Public License for more details.
  13
  14 You should have received a copy of the GNU Library General Public
  15 License along with GNU Fortran; see the file COPYING.LIB.  If
  16 not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17 Boston, MA 02111-1307, USA.  */
  18
  19 #ifdef HAVE_CONFIG_H
  20 #include "config.h"
  21 #endif
  22 #include "f2c.h"
  23 #include "fio.h"
  24
  25 integer
  26 G77_fnum_0 (integer * lunit)
  27 {
  28   if (*lunit >= MXUNIT || *lunit < 0)
  29     err (1, 101, "fnum");
  30
  31   if (f__units[*lunit].ufd == NULL)
  32     err (1, 114, "fnum");
  33
  34   /* f__units is a table of descriptions for the unit numbers (defined
  35      in io.h).  Use file descriptor (ufd) and fileno rather than udev
  36      field since udev is unix specific */
  37   return fileno (f__units[*lunit].ufd);
  38 }