genericopenlibs/cstdlib/LSTDIO/FWRITE.C
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Tue, 02 Feb 2010 02:01:42 +0200
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/* FWRITE.C
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 * 
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 * Portions Copyright (c) 1990-2005 Nokia Corporation and/or its subsidiary(-ies).
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 * All rights reserved.
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 */
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/*
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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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 * Redistribution and use in source and binary forms are permitted
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 * provided that the above copyright notice and this paragraph are
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 * duplicated in all such forms and that any documentation,
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 * advertising materials, and other materials related to such
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 * distribution and use acknowledge that the software was developed
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 * by the University of California, Berkeley.  The name of the
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 * University may not be used to endorse or promote products derived
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 * from this software without specific prior written permission.
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 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
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 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
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 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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 */
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/*
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FUNCTION
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<<fwrite>>---write array elements
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INDEX
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	fwrite
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ANSI_SYNOPSIS
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	#include <stdio.h>
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	size_t fwrite(const void *<[buf]>, size_t <[size]>,
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		      size_t <[count]>, FILE *<[fp]>);
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TRAD_SYNOPSIS
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	#include <stdio.h>
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	size_t fwrite(<[buf]>, <[size]>, <[count]>, <[fp]>)
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	char *<[buf]>;
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	size_t <[size]>;
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	size_t <[count]>;
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	FILE *<[fp]>;
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DESCRIPTION
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<<fwrite>> attempts to copy, starting from the memory location
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<[buf]>, <[count]> elements (each of size <[size]>) into the file or
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stream identified by <[fp]>.  <<fwrite>> may copy fewer elements than
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<[count]> if an error intervenes.
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<<fwrite>> also advances the file position indicator (if any) for
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<[fp]> by the number of @emph{characters} actually written.
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RETURNS
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If <<fwrite>> succeeds in writing all the elements you specify, the
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result is the same as the argument <[count]>.  In any event, the
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result is the number of complete elements that <<fwrite>> copied to
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the file.
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PORTABILITY
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ANSI C requires <<fwrite>>.
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Supporting OS subroutines required: <<close>>, <<fstat>>, <<isatty>>,
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<<lseek>>, <<read>>, <<sbrk>>, <<write>>.
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*/
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#include <stdio.h>
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#include <string.h>
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#include "LOCAL.H"
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#include "FVWRITE.H"
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/*
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 * Write `count' objects (each size `size') from memory to the given file.
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 * Return the number of whole objects written.
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 */
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EXPORT_C size_t
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fwrite (const void *buf, size_t size, size_t count, FILE * fp)
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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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  iov.iov_base = 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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  /*
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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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}