110 lines
3.7 KiB
C
110 lines
3.7 KiB
C
/* fwrite.c - write to a file. stdio.h */
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/* Copyright 1992-1993 Wind River Systems, Inc. */
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/*
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modification history
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--------------------
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01c,05mar93,jdi documentation cleanup for 5.1.
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01b,20sep92,smb documentation additions
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01a,29jul92,jcf Added OBJ_VERIFY
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+smb taken from UCB stdio
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*/
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/*
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DESCRIPTION
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* Copyright (c) 1990 The Regents of the University of California.
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* All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Chris Torek.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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INCLUDE FILE: stdio.h
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SEE ALSO: American National Standard X3.159-1989
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NOMANUAL
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*/
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#include "vxWorks.h"
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#include "objLib.h"
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#include "private/stdioP.h"
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#include "private/fvwriteP.h"
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/******************************************************************************
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*
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* fwrite - write from a specified array (ANSI)
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*
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* This routine writes, from the array <buf>, up to <count> elements whose
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* size is <size>, to a specified stream. The file position indicator for
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* the stream (if defined) is advanced by the number of characters
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* successfully written. If an error occurs, the resulting value of the file
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* position indicator for the stream is indeterminate.
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*
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* INCLUDE FILES: stdio.h
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*
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* RETURNS:
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* The number of elements successfully written, which will be less than
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* <count> only if a write error is encountered.
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*/
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int fwrite
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(
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const void * buf, /* where to copy from */
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size_t size, /* element size */
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size_t count, /* no. of elements */
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FILE * fp /* stream to write to */
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)
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{
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size_t n;
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struct __suio uio;
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struct __siov iov;
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if (OBJ_VERIFY (fp, fpClassId) != OK)
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return (0);
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iov.iov_base = (void *)buf;
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uio.uio_resid = iov.iov_len = n = (count * size);
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uio.uio_iov = &iov;
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uio.uio_iovcnt = 1;
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/* The usual case is success (__sfvwrite returns 0);
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* skip the divide if this happens, since divides are
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* generally slow and since this occurs whenever size==0.
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*/
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if (__sfvwrite(fp, &uio) == 0)
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return (count);
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return ((n - uio.uio_resid) / size);
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}
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