1 /* Copyright (C) 2009-2022 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 <printf.h>
20 #include <stdlib.h>
21 #include <libc-lock.h>
22 
23 
24 /* Array of functions indexed by format character.  */
25 libc_freeres_ptr (printf_va_arg_function **__printf_va_arg_table)
26   attribute_hidden;
27 
28 __libc_lock_define_initialized (static, lock);
29 
30 /* Last type allocated.  */
31 static int pa_next_type = PA_LAST;
32 
33 
34 int
__register_printf_type(printf_va_arg_function fct)35 __register_printf_type (printf_va_arg_function fct)
36 {
37   int result = -1;
38   __libc_lock_lock (lock);
39 
40   if (__printf_va_arg_table == NULL)
41     {
42       __printf_va_arg_table = (printf_va_arg_function **)
43 	calloc (0x100 - PA_LAST, sizeof (void *));
44       if (__printf_va_arg_table == NULL)
45 	goto out;
46     }
47 
48   if (pa_next_type == 0x100)
49     __set_errno (ENOSPC);
50   else
51     {
52       result = pa_next_type++;
53       __printf_va_arg_table[result - PA_LAST] = fct;
54     }
55 
56  out:
57   __libc_lock_unlock (lock);
58 
59   return result;
60 }
61 weak_alias (__register_printf_type, register_printf_type)
62