stdio-common/reg-printf.c

   1 /* Copyright (C) 1991,1996,1997,2002-2004,2009 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 <limits.h>
  21 #include <printf.h>
  22 #include <stddef.h>
  23 #include <stdlib.h>
  24 #include <bits/libc-lock.h>
  25
  26
  27 /* Array of functions indexed by format character.  */
  28 libc_freeres_ptr (printf_arginfo_size_function **__printf_arginfo_table)
  29   attribute_hidden;
  30 printf_function **__printf_function_table attribute_hidden;
  31
  32 __libc_lock_define_initialized (static, lock)
  33
  34 int __register_printf_specifier (int, printf_function,
  35                                  printf_arginfo_size_function);
  36 int __register_printf_function (int, printf_function,
  37                                 printf_arginfo_function);
  38
  39
  40 /* Register FUNC to be called to format SPEC specifiers.  */
  41 int
  42 __register_printf_specifier (spec, converter, arginfo)
  43      int spec;
  44      printf_function converter;
  45      printf_arginfo_size_function arginfo;
  46 {
  47   if (spec < 0 || spec > (int) UCHAR_MAX)
  48     {
  49       __set_errno (EINVAL);
  50       return -1;
  51     }
  52
  53   int result = 0;
  54   __libc_lock_lock (lock);
  55
  56   if (__printf_function_table == NULL)
  57     {
  58       __printf_arginfo_table = (printf_arginfo_size_function **)
  59         calloc (UCHAR_MAX + 1, sizeof (void *) * 2);
  60       if (__printf_arginfo_table == NULL)
  61         {
  62           result = -1;
  63           goto out;
  64         }
  65
  66       __printf_function_table = (printf_function **)
  67         (__printf_arginfo_table + UCHAR_MAX + 1);
  68     }
  69
  70   __printf_function_table[spec] = converter;
  71   __printf_arginfo_table[spec] = arginfo;
  72
  73  out:
  74   __libc_lock_unlock (lock);
  75
  76   return result;
  77 }
  78 weak_alias (__register_printf_specifier, register_printf_specifier)
  79
  80
  81 /* Register FUNC to be called to format SPEC specifiers.  */
  82 int
  83 __register_printf_function (spec, converter, arginfo)
  84      int spec;
  85      printf_function converter;
  86      printf_arginfo_function arginfo;
  87 {
  88   return __register_printf_specifier (spec, converter,
  89                                       (printf_arginfo_size_function*) arginfo);
  90 }
  91 weak_alias (__register_printf_function, register_printf_function)