1/* Copyright (C) 1991-2022 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
25static ssize_t
26do_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 (err: 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. */
37int
38vpprintf (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 (cfile: &temp_f.cfile, _IO_NO_READS,
54 cookie: (void *) port, fns: (cookie_io_functions_t) { write: do_write });
55
56 done = __vfprintf_internal (fp: &temp_f.cfile.__fp.file, format, ap: arg, mode_flags: 0);
57
58 return done;
59}
60

source code of glibc/hurd/vpprintf.c