stdio-common/reg-printf.c

   1 /* Copyright (C) 1991,1996,1997,2002,2003,2004 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
  25 /* Array of functions indexed by format character.  */
  26 libc_freeres_ptr (printf_arginfo_function **__printf_arginfo_table)
  27   attribute_hidden;
  28 printf_function **__printf_function_table attribute_hidden;
  29
  30 int __register_printf_function (int, printf_function,
  31                                 printf_arginfo_function) __THROW;
  32
  33 /* Register FUNC to be called to format SPEC specifiers.  */
  34 int
  35 __register_printf_function (spec, converter, arginfo)
  36      int spec;
  37      printf_function converter;
  38      printf_arginfo_function arginfo;
  39 {
  40   if (spec < 0 || spec > (int) UCHAR_MAX)
  41     {
  42       __set_errno (EINVAL);
  43       return -1;
  44     }
  45
  46   if (__printf_function_table == NULL)
  47     {
  48       __printf_arginfo_table = (printf_arginfo_function **)
  49         calloc (UCHAR_MAX + 1, sizeof (void *) * 2);
  50       if (__printf_arginfo_table == NULL)
  51         return -1;
  52       __printf_function_table = (printf_function **)
  53         (__printf_arginfo_table + UCHAR_MAX + 1);
  54     }
  55
  56   __printf_function_table[spec] = converter;
  57   __printf_arginfo_table[spec] = arginfo;
  58
  59   return 0;
  60 }
  61 weak_alias (__register_printf_function, register_printf_function)