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/* FILE * interface to a struct __*printf_buffer.
Copyright (C) 2022-2024 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/>. */
/* Registered printf format specifier callbacks produce data via a
FILE * stream. struct __printf_buffer_as_file enables vfprintf to
create a suitable stdio stream. Likewise struct
__wprintf_buffer_as_file for vfwprintf. */
#ifndef PRINTF_BUFFER_AS_FILE_H
#define PRINTF_BUFFER_AS_FILE_H
#include <libio/libioP.h>
struct __printf_buffer;
struct __printf_buffer_as_file
{
/* Interface to libio. */
FILE stream;
const struct _IO_jump_t *vtable;
/* Pointer to the underlying buffer. */
struct __printf_buffer *next;
};
/* Initialization *FP so that data written to its FILE * stream ends
up in NEXT. */
void __printf_buffer_as_file_init (struct __printf_buffer_as_file *fp,
struct __printf_buffer *next)
attribute_hidden;
/* Returns the FILE * that can be used to write data to the
buffer. */
static inline FILE *
__printf_buffer_as_file_get (struct __printf_buffer_as_file *file)
{
return &file->stream;
}
/* Transfers all pending data from the FILE * to the underlying
buffer. Returns true if there have been no errors. */
bool __printf_buffer_as_file_terminate (struct __printf_buffer_as_file *)
attribute_hidden;
/* Wide variant follows. */
struct __wprintf_buffer;
struct __wprintf_buffer_as_file
{
/* Interface to libio. */
FILE stream;
const struct _IO_jump_t *vtable;
struct _IO_wide_data wide_stream;
/* Pointer to the underlying buffer. */
struct __wprintf_buffer *next;
};
void __wprintf_buffer_as_file_init (struct __wprintf_buffer_as_file *fp,
struct __wprintf_buffer *next)
attribute_hidden;
static inline FILE *
__wprintf_buffer_as_file_get (struct __wprintf_buffer_as_file *file)
{
return &file->stream;
}
bool __wprintf_buffer_as_file_terminate (struct __wprintf_buffer_as_file *)
attribute_hidden;
#endif /* PRINTF_BUFFER_AS_FILE_H */
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