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
25static ssize_t
26do_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 (err: 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. */
38int
39vpprintf (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 (cfile: &temp_f.cfile, _IO_NO_READS,
55 cookie: (void *) (uintptr_t) port,
56 fns: (cookie_io_functions_t) { write: do_write });
57
58 done = __vfprintf_internal (fp: &temp_f.cfile.__fp.file, format, ap: arg, mode_flags: 0);
59
60 return done;
61}
62

source code of glibc/hurd/vpprintf.c