hurd/vpprintf.c

   1 /* Copyright (C) 1991, 1994, 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 <stdarg.h>
  20 #include <stdio.h>
  21 #include <string.h>
  22 #include <hurd.h>
  23
  24 static ssize_t
  25 pwrite (void *cookie,
  26         const char *buf,
  27         size_t n)
  28 {
  29   error_t error = __io_write ((io_t) cookie, buf, n, -1,
  30                               (mach_msg_type_number_t *) &n);
  31   if (error)
  32     return __hurd_fail (error);
  33   return n;
  34 }
  35
  36
  37 /* Write formatted output to PORT, a Mach port supporting the i/o protocol,
  38    according to the format string FORMAT, using the argument list in ARG.  */
  39 int
  40 vpprintf (io_t port,
  41           const char *format,
  42           va_list arg)
  43 {
  44   int done;
  45   FILE f;
  46
  47   /* Create an unbuffered stream talking to PORT on the stack.  */
  48   memset ((void *) &f, 0, sizeof (f));
  49   f.__magic = _IOMAGIC;
  50   f.__mode.__write = 1;
  51   f.__cookie = (void *) port;
  52   f.__room_funcs = __default_room_functions;
  53   f.__io_funcs.__write = pwrite;
  54   f.__seen = 1;
  55   f.__userbuf = 1;
  56
  57   /* vfprintf will use a buffer on the stack for the life of the call.  */
  58   done = vfprintf (&f, format, arg);
  59
  60   return done;
  61 }