1  /* Copyright (C) 1993-2023 Free Software Foundation, Inc.
       2     This file is part of the GNU C Library.
       3  
       4     The GNU C Library is free software; you can redistribute it and/or
       5     modify it under the terms of the GNU Lesser General Public
       6     License as published by the Free Software Foundation; either
       7     version 2.1 of the License, or (at your option) any later version.
       8  
       9     The GNU C Library is distributed in the hope that it will be useful,
      10     but WITHOUT ANY WARRANTY; without even the implied warranty of
      11     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      12     Lesser General Public License for more details.
      13  
      14     You should have received a copy of the GNU Lesser General Public
      15     License along with the GNU C Library; if not, see
      16     <https://www.gnu.org/licenses/>.
      17  
      18     As a special exception, if you link the code in this file with
      19     files compiled with a GNU compiler to produce an executable,
      20     that does not cause the resulting executable to be covered by
      21     the GNU Lesser General Public License.  This exception does not
      22     however invalidate any other reasons why the executable file
      23     might be covered by the GNU Lesser General Public License.
      24     This exception applies to code released by its copyright holders
      25     in files containing the exception.  */
      26  
      27  #include "libioP.h"
      28  
      29  size_t
      30  _IO_fwrite (const void *buf, size_t size, size_t count, FILE *fp)
      31  {
      32    size_t request = size * count;
      33    size_t written = 0;
      34    CHECK_FILE (fp, 0);
      35    if (request == 0)
      36      return 0;
      37    _IO_acquire_lock (fp);
      38    if (_IO_vtable_offset (fp) != 0 || _IO_fwide (fp, -1) == -1)
      39      written = _IO_sputn (fp, (const char *) buf, request);
      40    _IO_release_lock (fp);
      41    /* We have written all of the input in case the return value indicates
      42       this or EOF is returned.  The latter is a special case where we
      43       simply did not manage to flush the buffer.  But the data is in the
      44       buffer and therefore written as far as fwrite is concerned.  */
      45    if (written == request || written == EOF)
      46      return count;
      47    else
      48      return written / size;
      49  }
      50  libc_hidden_def (_IO_fwrite)
      51  
      52  # include <stdio.h>
      53  weak_alias (_IO_fwrite, fwrite)
      54  libc_hidden_weak (fwrite)
      55  # ifndef _IO_MTSAFE_IO
      56  weak_alias (_IO_fwrite, fwrite_unlocked)
      57  libc_hidden_weak (fwrite_unlocked)
      58  # endif