mirror of
https://sourceware.org/git/glibc.git
synced 2024-09-18 23:49:57 +00:00
125 lines
4.0 KiB
C
125 lines
4.0 KiB
C
/* FILE * interface to a struct __printf_buffer. Multibyte version.
|
|
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/>. */
|
|
|
|
#include <printf_buffer_as_file.h>
|
|
|
|
#include <assert.h>
|
|
#include <printf_buffer.h>
|
|
|
|
/* Commit the data directly written through the stdio stream. */
|
|
static void
|
|
__printf_buffer_as_file_commit (struct __printf_buffer_as_file *file)
|
|
{
|
|
/* Check that the write pointers in the file stream are consistent
|
|
with the next buffer. */
|
|
assert (file->stream._IO_write_ptr >= file->next->write_ptr);
|
|
assert (file->stream._IO_write_ptr <= file->next->write_end);
|
|
assert (file->stream._IO_write_base == file->next->write_base);
|
|
assert (file->stream._IO_write_end == file->next->write_end);
|
|
|
|
file->next->write_ptr = file->stream._IO_write_ptr;
|
|
}
|
|
|
|
/* Pointer the FILE * write buffer into the active printf_buffer
|
|
area. */
|
|
static void
|
|
__printf_buffer_as_file_switch_to_buffer (struct __printf_buffer_as_file *file)
|
|
{
|
|
file->stream._IO_write_base = file->next->write_base;
|
|
file->stream._IO_write_ptr = file->next->write_ptr;
|
|
file->stream._IO_write_end = file->next->write_end;
|
|
}
|
|
|
|
/* Only a small subset of the vtable functions is implemented here,
|
|
following _IO_obstack_jumps. */
|
|
|
|
int
|
|
__printf_buffer_as_file_overflow (FILE *fp, int ch)
|
|
{
|
|
struct __printf_buffer_as_file *file = (struct __printf_buffer_as_file *) fp;
|
|
|
|
__printf_buffer_as_file_commit (file);
|
|
|
|
/* EOF means only a flush is requested. */
|
|
if (ch != EOF)
|
|
__printf_buffer_putc (file->next, ch);
|
|
|
|
/* Ensure that flushing actually produces room. */
|
|
if (!__printf_buffer_has_failed (file->next)
|
|
&& file->next->write_ptr == file->next->write_end)
|
|
__printf_buffer_flush (file->next);
|
|
|
|
__printf_buffer_as_file_switch_to_buffer (file);
|
|
|
|
if (!__printf_buffer_has_failed (file->next))
|
|
return (unsigned char) ch;
|
|
else
|
|
return EOF;
|
|
}
|
|
|
|
size_t
|
|
__printf_buffer_as_file_xsputn (FILE *fp, const void *buf, size_t len)
|
|
{
|
|
struct __printf_buffer_as_file *file = (struct __printf_buffer_as_file *) fp;
|
|
|
|
__printf_buffer_as_file_commit (file);
|
|
|
|
/* Copy the data. */
|
|
__printf_buffer_write (file->next, buf, len);
|
|
|
|
__printf_buffer_as_file_switch_to_buffer (file);
|
|
|
|
if (!__printf_buffer_has_failed (file->next))
|
|
return len;
|
|
else
|
|
/* We may actually have written something. But the stream is
|
|
corrupted in this case anyway, so try not to divine the write
|
|
count here. */
|
|
return 0;
|
|
}
|
|
|
|
void
|
|
__printf_buffer_as_file_init (struct __printf_buffer_as_file *file,
|
|
struct __printf_buffer *next)
|
|
{
|
|
file->stream._lock = NULL;
|
|
_IO_no_init (&file->stream, _IO_USER_LOCK, -1, NULL, NULL);
|
|
file->vtable = &_IO_printf_buffer_as_file_jumps;
|
|
|
|
/* Set up the write buffer from the next buffer. */
|
|
file->next = next;
|
|
__printf_buffer_as_file_switch_to_buffer (file);
|
|
|
|
/* Mark the read area as inactive, by making all pointers equal. */
|
|
file->stream._IO_read_base = file->stream._IO_write_base;
|
|
file->stream._IO_read_ptr = file->stream._IO_write_base;
|
|
file->stream._IO_read_end = file->stream._IO_write_base;
|
|
}
|
|
|
|
bool
|
|
__printf_buffer_as_file_terminate (struct __printf_buffer_as_file *file)
|
|
{
|
|
if (file->stream._flags & _IO_ERR_SEEN)
|
|
return false;
|
|
else
|
|
{
|
|
__printf_buffer_as_file_commit (file);
|
|
return true;
|
|
}
|
|
}
|