1  /* Wide printf buffers writing data to a FILE *.
       2     Copyright (C) 2022-2023 Free Software Foundation, Inc.
       3     This file is part of the GNU C Library.
       4  
       5     The GNU C Library is free software; you can redistribute it and/or
       6     modify it under the terms of the GNU Lesser General Public
       7     License as published by the Free Software Foundation; either
       8     version 2.1 of the License, or (at your option) any later version.
       9  
      10     The GNU C Library is distributed in the hope that it will be useful,
      11     but WITHOUT ANY WARRANTY; without even the implied warranty of
      12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      13     Lesser General Public License for more details.
      14  
      15     You should have received a copy of the GNU Lesser General Public
      16     License along with the GNU C Library; if not, see
      17     <https://www.gnu.org/licenses/>.  */
      18  
      19  /* This implementation is not optimized (unlikely the multibyte
      20     implementation) and always writes to the temporary buffer first.  */
      21  
      22  #include <printf_buffer_to_file.h>
      23  
      24  #include <array_length.h>
      25  #include <libio/libioP.h>
      26  
      27  void
      28  __wprintf_buffer_flush_to_file (struct __wprintf_buffer_to_file *buf)
      29  {
      30    size_t count = buf->base.write_ptr - buf->stage;
      31    if ((size_t) _IO_sputn (buf->fp, buf->stage, count) != count)
      32      {
      33        __wprintf_buffer_mark_failed (&buf->base);
      34        return;
      35      }
      36    buf->base.written += count;
      37    buf->base.write_ptr = buf->stage;
      38  }
      39  
      40  void
      41  __wprintf_buffer_to_file_init (struct __wprintf_buffer_to_file *buf, FILE *fp)
      42  {
      43    __wprintf_buffer_init (&buf->base, buf->stage, array_length (buf->stage),
      44                           __wprintf_buffer_mode_to_file);
      45    buf->fp = fp;
      46  }
      47  
      48  int
      49  __wprintf_buffer_to_file_done (struct __wprintf_buffer_to_file *buf)
      50  {
      51    if (__wprintf_buffer_has_failed (&buf->base))
      52      return -1;
      53    __wprintf_buffer_flush_to_file (buf);
      54    return __wprintf_buffer_done (&buf->base);
      55  }