hurd/vpprintf.c

   1 /* Copyright (C) 1991-2021 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 Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the 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    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <https://www.gnu.org/licenses/>.  */
  17
  18 #include <stdarg.h>
  19 #include <stdio.h>
  20 #include <string.h>
  21 #include <hurd.h>
  22
  23 #include <libioP.h>
  24
  25 static ssize_t
  26 do_write (void *cookie, const char *buf, size_t n)
  27 {
  28   error_t error = __io_write ((io_t) cookie, buf, n, -1,
  29                               (mach_msg_type_number_t *) &n);
  30   if (error)
  31     return __hurd_fail (error);
  32   return n;
  33 }
  34
  35 /* Write formatted output to PORT, a Mach port supporting the i/o protocol,
  36    according to the format string FORMAT, using the argument list in ARG.  */
  37 int
  38 vpprintf (io_t port, const char *format, va_list arg)
  39 {
  40   int done;
  41
  42   struct locked_FILE
  43   {
  44     struct _IO_cookie_file cfile;
  45 #ifdef _IO_MTSAFE_IO
  46     _IO_lock_t lock;
  47 #endif
  48   } temp_f;
  49 #ifdef _IO_MTSAFE_IO
  50   temp_f.cfile.__fp.file._lock = &temp_f.lock;
  51 #endif
  52
  53   _IO_cookie_init (&temp_f.cfile, _IO_NO_READS,
  54                    (void *) port, (cookie_io_functions_t) { write: do_write });
  55
  56   done = __vfprintf_internal (&temp_f.cfile.__fp.file, format, arg, 0);
  57
  58   return done;
  59 }