1/* Copyright (C) 1991-2016 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 <http://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
25
26/* Array of functions indexed by format character. */
27libc_freeres_ptr (printf_arginfo_size_function **__printf_arginfo_table)
28 attribute_hidden;
29printf_function **__printf_function_table attribute_hidden;
30
31__libc_lock_define_initialized (static, lock)
32
33int __register_printf_specifier (int, printf_function,
34 printf_arginfo_size_function);
35int __register_printf_function (int, printf_function,
36 printf_arginfo_function);
37
38
39/* Register FUNC to be called to format SPEC specifiers. */
40int
41__register_printf_specifier (int spec, printf_function converter,
42 printf_arginfo_size_function arginfo)
43{
44 if (spec < 0 || spec > (int) UCHAR_MAX)
45 {
46 __set_errno (EINVAL);
47 return -1;
48 }
49
50 int result = 0;
51 __libc_lock_lock (lock);
52
53 if (__printf_function_table == NULL)
54 {
55 __printf_arginfo_table = (printf_arginfo_size_function **)
56 calloc (UCHAR_MAX + 1, sizeof (void *) * 2);
57 if (__printf_arginfo_table == NULL)
58 {
59 result = -1;
60 goto out;
61 }
62
63 __printf_function_table = (printf_function **)
64 (__printf_arginfo_table + UCHAR_MAX + 1);
65 }
66
67 __printf_function_table[spec] = converter;
68 __printf_arginfo_table[spec] = arginfo;
69
70 out:
71 __libc_lock_unlock (lock);
72
73 return result;
74}
75weak_alias (__register_printf_specifier, register_printf_specifier)
76
77
78/* Register FUNC to be called to format SPEC specifiers. */
79int
80__register_printf_function (int spec, printf_function converter,
81 printf_arginfo_function arginfo)
82{
83 return __register_printf_specifier (spec, converter,
84 (printf_arginfo_size_function*) arginfo);
85}
86weak_alias (__register_printf_function, register_printf_function)
87