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glibc  2.9
reg-printf.c
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00001 /* Copyright (C) 1991,1996,1997,2002,2003,2004 Free Software Foundation, Inc.
00002    This file is part of the GNU C Library.
00003 
00004    The GNU C Library is free software; you can redistribute it and/or
00005    modify it under the terms of the GNU Lesser General Public
00006    License as published by the Free Software Foundation; either
00007    version 2.1 of the License, or (at your option) any later version.
00008 
00009    The GNU C Library is distributed in the hope that it will be useful,
00010    but WITHOUT ANY WARRANTY; without even the implied warranty of
00011    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00012    Lesser General Public License for more details.
00013 
00014    You should have received a copy of the GNU Lesser General Public
00015    License along with the GNU C Library; if not, write to the Free
00016    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00017    02111-1307 USA.  */
00018 
00019 #include <errno.h>
00020 #include <limits.h>
00021 #include <printf.h>
00022 #include <stddef.h>
00023 #include <stdlib.h>
00024 
00025 /* Array of functions indexed by format character.  */
00026 libc_freeres_ptr (printf_arginfo_function **__printf_arginfo_table)
00027   attribute_hidden;
00028 printf_function **__printf_function_table attribute_hidden;
00029 
00030 int __register_printf_function (int, printf_function,
00031                             printf_arginfo_function) __THROW;
00032 
00033 /* Register FUNC to be called to format SPEC specifiers.  */
00034 int
00035 __register_printf_function (spec, converter, arginfo)
00036      int spec;
00037      printf_function converter;
00038      printf_arginfo_function arginfo;
00039 {
00040   if (spec < 0 || spec > (int) UCHAR_MAX)
00041     {
00042       __set_errno (EINVAL);
00043       return -1;
00044     }
00045 
00046   if (__printf_function_table == NULL)
00047     {
00048       __printf_arginfo_table = (printf_arginfo_function **)
00049        calloc (UCHAR_MAX + 1, sizeof (void *) * 2);
00050       if (__printf_arginfo_table == NULL)
00051        return -1;
00052       __printf_function_table = (printf_function **)
00053        (__printf_arginfo_table + UCHAR_MAX + 1);
00054     }
00055 
00056   __printf_function_table[spec] = converter;
00057   __printf_arginfo_table[spec] = arginfo;
00058 
00059   return 0;
00060 }
00061 weak_alias (__register_printf_function, register_printf_function)