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