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125 lines
4.0 KiB
C
125 lines
4.0 KiB
C
/* FILE * interface to a struct __printf_buffer. Multibyte version.
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Copyright (C) 2022-2024 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <printf_buffer_as_file.h>
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#include <assert.h>
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#include <printf_buffer.h>
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/* Commit the data directly written through the stdio stream. */
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static void
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__printf_buffer_as_file_commit (struct __printf_buffer_as_file *file)
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{
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/* Check that the write pointers in the file stream are consistent
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with the next buffer. */
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assert (file->stream._IO_write_ptr >= file->next->write_ptr);
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assert (file->stream._IO_write_ptr <= file->next->write_end);
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assert (file->stream._IO_write_base == file->next->write_base);
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assert (file->stream._IO_write_end == file->next->write_end);
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file->next->write_ptr = file->stream._IO_write_ptr;
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}
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/* Pointer the FILE * write buffer into the active printf_buffer
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area. */
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static void
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__printf_buffer_as_file_switch_to_buffer (struct __printf_buffer_as_file *file)
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{
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file->stream._IO_write_base = file->next->write_base;
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file->stream._IO_write_ptr = file->next->write_ptr;
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file->stream._IO_write_end = file->next->write_end;
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}
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/* Only a small subset of the vtable functions is implemented here,
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following _IO_obstack_jumps. */
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int
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__printf_buffer_as_file_overflow (FILE *fp, int ch)
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{
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struct __printf_buffer_as_file *file = (struct __printf_buffer_as_file *) fp;
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__printf_buffer_as_file_commit (file);
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/* EOF means only a flush is requested. */
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if (ch != EOF)
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__printf_buffer_putc (file->next, ch);
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/* Ensure that flushing actually produces room. */
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if (!__printf_buffer_has_failed (file->next)
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&& file->next->write_ptr == file->next->write_end)
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__printf_buffer_flush (file->next);
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__printf_buffer_as_file_switch_to_buffer (file);
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if (!__printf_buffer_has_failed (file->next))
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return (unsigned char) ch;
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else
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return EOF;
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}
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size_t
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__printf_buffer_as_file_xsputn (FILE *fp, const void *buf, size_t len)
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{
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struct __printf_buffer_as_file *file = (struct __printf_buffer_as_file *) fp;
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__printf_buffer_as_file_commit (file);
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/* Copy the data. */
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__printf_buffer_write (file->next, buf, len);
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__printf_buffer_as_file_switch_to_buffer (file);
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if (!__printf_buffer_has_failed (file->next))
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return len;
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else
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/* We may actually have written something. But the stream is
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corrupted in this case anyway, so try not to divine the write
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count here. */
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return 0;
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}
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void
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__printf_buffer_as_file_init (struct __printf_buffer_as_file *file,
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struct __printf_buffer *next)
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{
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file->stream._lock = NULL;
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_IO_no_init (&file->stream, _IO_USER_LOCK, -1, NULL, NULL);
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file->vtable = &_IO_printf_buffer_as_file_jumps;
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/* Set up the write buffer from the next buffer. */
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file->next = next;
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__printf_buffer_as_file_switch_to_buffer (file);
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/* Mark the read area as inactive, by making all pointers equal. */
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file->stream._IO_read_base = file->stream._IO_write_base;
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file->stream._IO_read_ptr = file->stream._IO_write_base;
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file->stream._IO_read_end = file->stream._IO_write_base;
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}
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bool
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__printf_buffer_as_file_terminate (struct __printf_buffer_as_file *file)
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{
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if (file->stream._flags & _IO_ERR_SEEN)
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return false;
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else
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{
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__printf_buffer_as_file_commit (file);
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return true;
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}
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}
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