stdio-common/reg-type.c

   1 /* Copyright (C) 2009 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, write to the Free
  16    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  17    02111-1307 USA.  */
  18
  19 #include <errno.h>
  20 #include <printf.h>
  21 #include <stdlib.h>
  22 #include <bits/libc-lock.h>
  23
  24
  25 /* Array of functions indexed by format character.  */
  26 libc_freeres_ptr (printf_va_arg_function **__printf_va_arg_table)
  27   attribute_hidden;
  28
  29 __libc_lock_define_initialized (static, lock);
  30
  31 /* Last type allocated.  */
  32 static int pa_next_type = PA_LAST;
  33
  34
  35 int
  36 __register_printf_type (printf_va_arg_function fct)
  37 {
  38   int result = -1;
  39   __libc_lock_lock (lock);
  40
  41   if (__printf_va_arg_table == NULL)
  42     {
  43       __printf_va_arg_table = (printf_va_arg_function **)
  44         calloc (0x100 - PA_LAST, sizeof (void *));
  45       if (__printf_va_arg_table == NULL)
  46         goto out;
  47     }
  48
  49   if (pa_next_type == 0x100)
  50     __set_errno (ENOSPC);
  51   else
  52     {
  53       result = pa_next_type++;
  54       __printf_va_arg_table[result - PA_LAST] = fct;
  55     }
  56
  57  out:
  58   __libc_lock_unlock (lock);
  59
  60   return result;
  61 }
  62 weak_alias (__register_printf_type, register_printf_type)