mirror of git://sourceware.org/git/glibc.git
88 lines
3.4 KiB
C
88 lines
3.4 KiB
C
/* Copyright (C) 1993-2025 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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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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size_t
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_IO_fwrite (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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_IO_acquire_lock (fp);
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if (_IO_vtable_offset (fp) != 0 || _IO_fwide (fp, -1) == -1)
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{
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/* Compute actually written bytes plus pending buffer
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contents. */
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uint64_t original_total_written
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= fp->_total_written + (fp->_IO_write_ptr - fp->_IO_write_base);
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written = _IO_sputn (fp, (const char *) buf, request);
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if (written == EOF)
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{
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/* An error happened and we need to find the appropriate return
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value. There 3 possible scenarios:
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1. If the number of bytes written is between 0..[buffer content],
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we need to return 0 because none of the bytes from this
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request have been written;
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2. If the number of bytes written is between
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[buffer content]+1..request-1, that means we managed to write
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data requested in this fwrite call;
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3. We might have written all the requested data and got an error
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anyway. We can't return success, which means we still have to
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return less than request. */
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if (fp->_total_written > original_total_written)
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{
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written = fp->_total_written - original_total_written;
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/* If everything was reported as written and somehow an
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error occurred afterwards, avoid reporting success. */
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if (written == request)
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--written;
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}
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else
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/* Only already-pending buffer contents was written. */
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written = 0;
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}
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}
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_IO_release_lock (fp);
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/* We have written all of the input in case the return value indicates
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this. */
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if (written == request)
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return count;
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else
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return written / size;
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}
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libc_hidden_def (_IO_fwrite)
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# include <stdio.h>
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weak_alias (_IO_fwrite, fwrite)
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libc_hidden_weak (fwrite)
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# ifndef _IO_MTSAFE_IO
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weak_alias (_IO_fwrite, fwrite_unlocked)
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libc_hidden_weak (fwrite_unlocked)
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# endif
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