stdio-common/reg-type.c

   1 /* Copyright (C) 2009-2023 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 <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
  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)