Blame libio/iofwrite_u.c

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/* Copyright (C) 1993-2018 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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   <http://www.gnu.org/licenses/>.
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   As a special exception, if you link the code in this file with
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   files compiled with a GNU compiler to produce an executable,
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   that does not cause the resulting executable to be covered by
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   the GNU Lesser General Public License.  This exception does not
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   however invalidate any other reasons why the executable file
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   might be covered by the GNU Lesser General Public License.
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   This exception applies to code released by its copyright holders
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   in files containing the exception.  */
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#include "libioP.h"
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#include <stdio.h>
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#undef fwrite_unlocked
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size_t
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fwrite_unlocked (const void *buf, size_t size, size_t count, FILE *fp)
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{
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  size_t request = size * count;
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  size_t written = 0;
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  CHECK_FILE (fp, 0);
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  if (request == 0)
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    return 0;
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  if (_IO_fwide (fp, -1) == -1)
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    {
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      written = _IO_sputn (fp, (const char *) buf, request);
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      /* We have written all of the input in case the return value indicates
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	 this or EOF is returned.  The latter is a special case where we
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	 simply did not manage to flush the buffer.  But the data is in the
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	 buffer and therefore written as far as fwrite is concerned.  */
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      if (written == request || written == EOF)
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	return count;
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    }
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  return written / size;
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}
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libc_hidden_def (fwrite_unlocked)