hurd/vpprintf.c

   1 /* Copyright (C) 1991-2024 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   io_t io = (io_t) (uintptr_t) cookie;
  29   vm_size_t amount = n;
  30   error_t error = __io_write (io, buf, n, -1, &amount);
  31   if (error)
  32     return __hurd_fail (error);
  33   return n;
  34 }
  35
  36 /* Write formatted output to PORT, a Mach port supporting the i/o protocol,
  37    according to the format string FORMAT, using the argument list in ARG.  */
  38 int
  39 vpprintf (io_t port, const char *format, va_list arg)
  40 {
  41   int done;
  42
  43   struct locked_FILE
  44   {
  45     struct _IO_cookie_file cfile;
  46 #ifdef _IO_MTSAFE_IO
  47     _IO_lock_t lock;
  48 #endif
  49   } temp_f;
  50 #ifdef _IO_MTSAFE_IO
  51   temp_f.cfile.__fp.file._lock = &temp_f.lock;
  52 #endif
  53
  54   _IO_cookie_init (&temp_f.cfile, _IO_NO_READS,
  55                    (void *) (uintptr_t) port,
  56                    (cookie_io_functions_t) { write: do_write });
  57
  58   done = __vfprintf_internal (&temp_f.cfile.__fp.file, format, arg, 0);
  59
  60   return done;
  61 }