1/* Copyright (C) 1991-2023 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 <errno.h>
19#include <limits.h>
20#include <printf.h>
21#include <stddef.h>
22#include <stdlib.h>
23#include <libc-lock.h>
24#include <set-freeres.h>
25
26
27/* Array of functions indexed by format character. */
28printf_arginfo_size_function **__printf_arginfo_table attribute_hidden;
29printf_function **__printf_function_table attribute_hidden;
30
31__libc_lock_define_initialized (static, lock)
32
33/* Register FUNC to be called to format SPEC specifiers. */
34int
35__register_printf_specifier (int spec, printf_function converter,
36 printf_arginfo_size_function arginfo)
37{
38 if (spec < 0 || spec > (int) UCHAR_MAX)
39 {
40 __set_errno (EINVAL);
41 return -1;
42 }
43
44 int result = 0;
45 __libc_lock_lock (lock);
46
47 if (__printf_function_table == NULL)
48 {
49 __printf_arginfo_table = (printf_arginfo_size_function **)
50 calloc (UCHAR_MAX + 1, sizeof (void *) * 2);
51 if (__printf_arginfo_table == NULL)
52 {
53 result = -1;
54 goto out;
55 }
56
57 __printf_function_table = (printf_function **)
58 (__printf_arginfo_table + UCHAR_MAX + 1);
59 }
60
61 __printf_function_table[spec] = converter;
62 __printf_arginfo_table[spec] = arginfo;
63
64 out:
65 __libc_lock_unlock (lock);
66
67 return result;
68}
69libc_hidden_def (__register_printf_specifier)
70weak_alias (__register_printf_specifier, register_printf_specifier)
71
72
73/* Register FUNC to be called to format SPEC specifiers. */
74int
75__register_printf_function (int spec, printf_function converter,
76 printf_arginfo_function arginfo)
77{
78 return __register_printf_specifier (spec, converter,
79 (printf_arginfo_size_function*) arginfo);
80}
81weak_alias (__register_printf_function, register_printf_function)
82
83weak_alias (__printf_arginfo_table, __libc_reg_printf_freemem_ptr)
84