1  /* Copyright (C) 1991-2023 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  #include <set-freeres.h>
      25  
      26  
      27  /* Array of functions indexed by format character.  */
      28  printf_arginfo_size_function **__printf_arginfo_table attribute_hidden;
      29  printf_function **__printf_function_table attribute_hidden;
      30  
      31  __libc_lock_define_initialized (static, lock)
      32  
      33  /* Register FUNC to be called to format SPEC specifiers.  */
      34  int
      35  __register_printf_specifier (int spec, printf_function converter,
      36  			     printf_arginfo_size_function arginfo)
      37  {
      38    if (spec < 0 || spec > (int) UCHAR_MAX)
      39      {
      40        __set_errno (EINVAL);
      41        return -1;
      42      }
      43  
      44    int result = 0;
      45    __libc_lock_lock (lock);
      46  
      47    if (__printf_function_table == NULL)
      48      {
      49        __printf_arginfo_table = (printf_arginfo_size_function **)
      50  	calloc (UCHAR_MAX + 1, sizeof (void *) * 2);
      51        if (__printf_arginfo_table == NULL)
      52  	{
      53  	  result = -1;
      54  	  goto out;
      55  	}
      56  
      57        __printf_function_table = (printf_function **)
      58  	(__printf_arginfo_table + UCHAR_MAX + 1);
      59      }
      60  
      61    __printf_function_table[spec] = converter;
      62    __printf_arginfo_table[spec] = arginfo;
      63  
      64   out:
      65    __libc_lock_unlock (lock);
      66  
      67    return result;
      68  }
      69  libc_hidden_def (__register_printf_specifier)
      70  weak_alias (__register_printf_specifier, register_printf_specifier)
      71  
      72  
      73  /* Register FUNC to be called to format SPEC specifiers.  */
      74  int
      75  __register_printf_function (int spec, printf_function converter,
      76  			    printf_arginfo_function arginfo)
      77  {
      78    return __register_printf_specifier (spec, converter,
      79  				      (printf_arginfo_size_function*) arginfo);
      80  }
      81  weak_alias (__register_printf_function, register_printf_function)
      82  
      83  weak_alias (__printf_arginfo_table, __libc_reg_printf_freemem_ptr)