sysdeps/mach/hurd/vdprintf.c

   1 /* Copyright (C) 1991, 1992, 1993, 1997 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Library General Public License as
   6    published by the Free Software Foundation; either version 2 of the
   7    License, or (at your option) any later version.
   8
   9    The GNU C Library 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 the GNU C Library; see the file COPYING.LIB.  If not,
  16    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17    Boston, MA 02111-1307, USA.  */
  18
  19 #include <errno.h>
  20 #include <limits.h>
  21 #include <stdarg.h>
  22 #include <stdio.h>
  23 #include <string.h>
  24 #include <hurd/fd.h>
  25
  26 /* Write formatted output to file descriptor D according to the format string
  27    FORMAT, using the argument list in ARG.  */
  28 int
  29 vdprintf (int d, const char *format, va_list arg)
  30 {
  31   int done;
  32   FILE f;
  33   struct hurd_fd *fd;
  34
  35   HURD_CRITICAL_BEGIN;
  36   fd = _hurd_fd_get (d);
  37   HURD_CRITICAL_END;
  38
  39   if (!fd)
  40     return 0;
  41
  42   /* Create an unbuffered stream talking to D on the stack.  */
  43   memset ((void *) &f, 0, sizeof (f));
  44   f.__magic = _IOMAGIC;
  45   f.__mode.__write = 1;
  46   f.__cookie = fd;
  47   f.__room_funcs = __default_room_functions;
  48   f.__io_funcs = __default_io_functions;
  49   f.__seen = 1;
  50   f.__userbuf = 1;
  51
  52   /* vfprintf will use a buffer on the stack for the life of the call,
  53      and flush it when finished.  */
  54   done = vfprintf (&f, format, arg);
  55
  56   return done;
  57 }