mirror of
git://sourceware.org/git/glibc.git
synced 2024-11-21 01:12:26 +08:00
59 lines
1.9 KiB
C
59 lines
1.9 KiB
C
/* Invoke a printf specifier handler. Generic version.
|
|
Copyright (C) 1991-2024 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;
|
|
}
|