1 /* Copyright (C) 1991-2021 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
25
26 /* Array of functions indexed by format character. */
27 libc_freeres_ptr (printf_arginfo_size_function **__printf_arginfo_table)
28 attribute_hidden;
29 printf_function **__printf_function_table attribute_hidden;
30
31 __libc_lock_define_initialized (static, lock)
32
33 int __register_printf_specifier (int, printf_function,
34 printf_arginfo_size_function);
35 libc_hidden_proto (__register_printf_specifier)
36 int __register_printf_function (int, printf_function,
37 printf_arginfo_function);
38
39
40 /* Register FUNC to be called to format SPEC specifiers. */
41 int
__register_printf_specifier(int spec,printf_function converter,printf_arginfo_size_function arginfo)42 __register_printf_specifier (int spec, printf_function converter,
43 printf_arginfo_size_function arginfo)
44 {
45 if (spec < 0 || spec > (int) UCHAR_MAX)
46 {
47 __set_errno (EINVAL);
48 return -1;
49 }
50
51 int result = 0;
52 __libc_lock_lock (lock);
53
54 if (__printf_function_table == NULL)
55 {
56 __printf_arginfo_table = (printf_arginfo_size_function **)
57 calloc (UCHAR_MAX + 1, sizeof (void *) * 2);
58 if (__printf_arginfo_table == NULL)
59 {
60 result = -1;
61 goto out;
62 }
63
64 __printf_function_table = (printf_function **)
65 (__printf_arginfo_table + UCHAR_MAX + 1);
66 }
67
68 __printf_function_table[spec] = converter;
69 __printf_arginfo_table[spec] = arginfo;
70
71 out:
72 __libc_lock_unlock (lock);
73
74 return result;
75 }
76 libc_hidden_def (__register_printf_specifier)
weak_alias(__register_printf_specifier,register_printf_specifier)77 weak_alias (__register_printf_specifier, register_printf_specifier)
78
79
80 /* Register FUNC to be called to format SPEC specifiers. */
81 int
82 __register_printf_function (int spec, printf_function converter,
83 printf_arginfo_function arginfo)
84 {
85 return __register_printf_specifier (spec, converter,
86 (printf_arginfo_size_function*) arginfo);
87 }
88 weak_alias (__register_printf_function, register_printf_function)
89