sysdeps/posix/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
  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
  34   /* Create an unbuffered stream talking to D on the stack.  */
  35   memset ((void *) &f, 0, sizeof(f));
  36   f.__magic = _IOMAGIC;
  37   f.__mode.__write = 1;
  38   f.__cookie = (void *) (long int) d; /* Casting to long quiets GCC on Alpha.*/
  39   f.__room_funcs = __default_room_functions;
  40   f.__io_funcs = __default_io_functions;
  41   f.__seen = 1;
  42   f.__userbuf = 1;
  43
  44   /* vfprintf will use a buffer on the stack for the life of the call,
  45      and flush it when finished.  */
  46   done = vfprintf (&f, format, arg);
  47
  48   return done;
  49 }