hurd/vpprintf.c

   1 /* Copyright (C) 1991, 1994 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 <stdarg.h>
  21 #include <stdio.h>
  22 #include <string.h>
  23 #include <hurd.h>
  24
  25 static ssize_t
  26 DEFUN(pwrite, (cookie, buf, n),
  27       PTR cookie AND CONST char *buf AND 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 DEFUN(vpprintf, (port, format, arg),
  41       io_t port AND CONST char *format AND va_list arg)
  42 {
  43   int done;
  44   FILE f;
  45
  46   /* Create an unbuffered stream talking to PORT on the stack.  */
  47   memset((PTR) &f, 0, sizeof(f));
  48   f.__magic = _IOMAGIC;
  49   f.__mode.__write = 1;
  50   f.__cookie = (PTR) port;
  51   f.__room_funcs = __default_room_functions;
  52   f.__io_funcs.__write = pwrite;
  53   f.__seen = 1;
  54   f.__userbuf = 1;
  55
  56   /* vfprintf will use a buffer on the stack for the life of the call.  */
  57   done = vfprintf(&f, format, arg);
  58
  59   return done;
  60 }