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glibc/stdio-common/reg-printf.c
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/* Copyright (C) 1991-2016 Free Software Foundation, Inc. | |
This file is part of the GNU C Library. | |
The GNU C Library is free software; you can redistribute it and/or | |
modify it under the terms of the GNU Lesser General Public | |
License as published by the Free Software Foundation; either | |
version 2.1 of the License, or (at your option) any later version. | |
The GNU C Library is distributed in the hope that it will be useful, | |
but WITHOUT ANY WARRANTY; without even the implied warranty of | |
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
Lesser General Public License for more details. | |
You should have received a copy of the GNU Lesser General Public | |
License along with the GNU C Library; if not, see | |
<http://www.gnu.org/licenses/>. */ | |
#include <errno.h> | |
#include <limits.h> | |
#include <printf.h> | |
#include <stddef.h> | |
#include <stdlib.h> | |
#include <libc-lock.h> | |
/* Array of functions indexed by format character. */ | |
libc_freeres_ptr (printf_arginfo_size_function **__printf_arginfo_table) | |
attribute_hidden; | |
printf_function **__printf_function_table attribute_hidden; | |
__libc_lock_define_initialized (static, lock) | |
int __register_printf_specifier (int, printf_function, | |
printf_arginfo_size_function); | |
int __register_printf_function (int, printf_function, | |
printf_arginfo_function); | |
/* Register FUNC to be called to format SPEC specifiers. */ | |
int | |
__register_printf_specifier (int spec, printf_function converter, | |
printf_arginfo_size_function arginfo) | |
{ | |
if (spec < 0 || spec > (int) UCHAR_MAX) | |
{ | |
__set_errno (EINVAL); | |
return -1; | |
} | |
int result = 0; | |
__libc_lock_lock (lock); | |
if (__printf_function_table == NULL) | |
{ | |
__printf_arginfo_table = (printf_arginfo_size_function **) | |
calloc (UCHAR_MAX + 1, sizeof (void *) * 2); | |
if (__printf_arginfo_table == NULL) | |
{ | |
result = -1; | |
goto out; | |
} | |
__printf_function_table = (printf_function **) | |
(__printf_arginfo_table + UCHAR_MAX + 1); | |
} | |
__printf_function_table[spec] = converter; | |
__printf_arginfo_table[spec] = arginfo; | |
out: | |
__libc_lock_unlock (lock); | |
return result; | |
} | |
weak_alias (__register_printf_specifier, register_printf_specifier) | |
/* Register FUNC to be called to format SPEC specifiers. */ | |
int | |
__register_printf_function (int spec, printf_function converter, | |
printf_arginfo_function arginfo) | |
{ | |
return __register_printf_specifier (spec, converter, | |
(printf_arginfo_size_function*) arginfo); | |
} | |
weak_alias (__register_printf_function, register_printf_function) |