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glibc  2.9
iofwrite.c
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00001 /* Copyright (C) 1993, 1996, 1997, 1998, 1999, 2000, 2002, 2003, 2008
00002    Free Software Foundation, Inc.
00003    This file is part of the GNU C Library.
00004 
00005    The GNU C Library is free software; you can redistribute it and/or
00006    modify it under the terms of the GNU Lesser General Public
00007    License as published by the Free Software Foundation; either
00008    version 2.1 of the License, or (at your option) any later version.
00009 
00010    The GNU C Library is distributed in the hope that it will be useful,
00011    but WITHOUT ANY WARRANTY; without even the implied warranty of
00012    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00013    Lesser General Public License for more details.
00014 
00015    You should have received a copy of the GNU Lesser General Public
00016    License along with the GNU C Library; if not, write to the Free
00017    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00018    02111-1307 USA.
00019 
00020    As a special exception, if you link the code in this file with
00021    files compiled with a GNU compiler to produce an executable,
00022    that does not cause the resulting executable to be covered by
00023    the GNU Lesser General Public License.  This exception does not
00024    however invalidate any other reasons why the executable file
00025    might be covered by the GNU Lesser General Public License.
00026    This exception applies to code released by its copyright holders
00027    in files containing the exception.  */
00028 
00029 #include "libioP.h"
00030 
00031 _IO_size_t
00032 _IO_fwrite (buf, size, count, fp)
00033      const void *buf;
00034      _IO_size_t size;
00035      _IO_size_t count;
00036      _IO_FILE *fp;
00037 {
00038   _IO_size_t request = size * count;
00039   _IO_size_t written = 0;
00040   CHECK_FILE (fp, 0);
00041   if (request == 0)
00042     return 0;
00043   _IO_acquire_lock (fp);
00044   if (_IO_vtable_offset (fp) != 0 || _IO_fwide (fp, -1) == -1)
00045     written = _IO_sputn (fp, (const char *) buf, request);
00046   _IO_release_lock (fp);
00047   /* We have written all of the input in case the return value indicates
00048      this or EOF is returned.  The latter is a special case where we
00049      simply did not manage to flush the buffer.  But the data is in the
00050      buffer and therefore written as far as fwrite is concerned.  */
00051   if (written == request || written == EOF)
00052     return count;
00053   else
00054     return written / size;
00055 }
00056 INTDEF(_IO_fwrite)
00057 
00058 #ifdef weak_alias
00059 # include <stdio.h>
00060 weak_alias (_IO_fwrite, fwrite)
00061 libc_hidden_weak (fwrite)
00062 # ifndef _IO_MTSAFE_IO
00063 weak_alias (_IO_fwrite, fwrite_unlocked)
00064 libc_hidden_weak (fwrite_unlocked)
00065 # endif
00066 #endif