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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 | |
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) | |
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) |