stdio/vdprintf.c

   1 /* Copyright (C) 1991, 1992, 1993 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
  16 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
  17 Cambridge, MA 02139, USA.  */
  18
  19 #include <ansidecl.h>
  20 #include <errno.h>
  21 #include <limits.h>
  22 #include <stdarg.h>
  23 #include <stdio.h>
  24 #include <string.h>
  25
  26
  27 /* Write formatted output to file descriptor D according to the format string
  28    FORMAT, using the argument list in ARG.  */
  29 int
  30 DEFUN(vdprintf, (d, format, arg),
  31       int d AND CONST char *format AND va_list arg)
  32 {
  33   int done;
  34   FILE f;
  35
  36   /* Create an unbuffered stream talking to D on the stack.  */
  37   memset ((PTR) &f, 0, sizeof(f));
  38   f.__magic = _IOMAGIC;
  39   f.__mode.__write = 1;
  40   f.__cookie = (PTR) (long int) d; /* Casting to long quiets GCC on Alpha.  */
  41   f.__room_funcs = __default_room_functions;
  42   f.__io_funcs = __default_io_functions;
  43   f.__seen = 1;
  44   f.__userbuf = 1;
  45
  46   /* vfprintf will use a buffer on the stack for the life of the call,
  47      and flush it when finished.  */
  48   done = vfprintf (&f, format, arg);
  49
  50   return done;
  51 }