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/* Invoke a printf specifier handler. Generic version.
Copyright (C) 1991-2025 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
<https://www.gnu.org/licenses/>. */
#include <array_length.h>
int
Xprintf (function_invoke) (void *buf,
printf_function callback,
union printf_arg *args_value,
size_t ndata_args,
struct printf_info *info)
{
/* Most custom specifiers expect just one argument. Use the heap
for larger argument arrays. */
const void *onstack_args[4];
const void **args;
if (ndata_args <= array_length (onstack_args))
args = onstack_args;
else
{
args = calloc (ndata_args, sizeof (*args));
if (args == NULL)
return -1;
}
for (unsigned int i = 0; i < ndata_args; ++i)
args[i] = &args_value[i];
struct Xprintf (buffer_as_file) s;
Xprintf (buffer_as_file_init) (&s, buf);
/* Call the function. */
int done = callback (Xprintf (buffer_as_file_get) (&s), info, args);
if (!Xprintf (buffer_as_file_terminate) (&s))
done = -1;
if (args != onstack_args)
free (args);
/* Potential error from the callback function. */
return done;
}
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