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. */ |
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 | int __register_printf_function (int, printf_function, |
36 | printf_arginfo_function); |
37 | |
38 | |
39 | /* Register FUNC to be called to format SPEC specifiers. */ |
40 | int |
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 | } |
75 | weak_alias (__register_printf_specifier, register_printf_specifier) |
76 | |
77 | |
78 | /* Register FUNC to be called to format SPEC specifiers. */ |
79 | int |
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 | } |
86 | weak_alias (__register_printf_function, register_printf_function) |
87 | |