/* FWRITE.C

 * 

 * Portions Copyright (c) 1990-2005 Nokia Corporation and/or its subsidiary(-ies).

 * All rights reserved.

 */

/*

 * Copyright (c) 1990 The Regents of the University of California.

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms are permitted

 * provided that the above copyright notice and this paragraph are

 * duplicated in all such forms and that any documentation,

 * advertising materials, and other materials related to such

 * distribution and use acknowledge that the software was developed

 * by the University of California, Berkeley.  The name of the

 * University may not be used to endorse or promote products derived

 * from this software without specific prior written permission.

 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR

 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED

 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.

 */

/*

FUNCTION

<<fwrite>>---write array elements

INDEX

	fwrite

ANSI_SYNOPSIS

	#include <stdio.h>

	size_t fwrite(const void *<[buf]>, size_t <[size]>,

		      size_t <[count]>, FILE *<[fp]>);

TRAD_SYNOPSIS

	#include <stdio.h>

	size_t fwrite(<[buf]>, <[size]>, <[count]>, <[fp]>)

	char *<[buf]>;

	size_t <[size]>;

	size_t <[count]>;

	FILE *<[fp]>;

DESCRIPTION

<<fwrite>> attempts to copy, starting from the memory location

<[buf]>, <[count]> elements (each of size <[size]>) into the file or

stream identified by <[fp]>.  <<fwrite>> may copy fewer elements than

<[count]> if an error intervenes.

<<fwrite>> also advances the file position indicator (if any) for

<[fp]> by the number of @emph{characters} actually written.

RETURNS

If <<fwrite>> succeeds in writing all the elements you specify, the

result is the same as the argument <[count]>.  In any event, the

result is the number of complete elements that <<fwrite>> copied to

the file.

PORTABILITY

ANSI C requires <<fwrite>>.

Supporting OS subroutines required: <<close>>, <<fstat>>, <<isatty>>,

<<lseek>>, <<read>>, <<sbrk>>, <<write>>.

*/

#include <stdio.h>

#include <string.h>

#include "LOCAL.H"

#include "FVWRITE.H"

/*

 * Write `count' objects (each size `size') from memory to the given file.

 * Return the number of whole objects written.

 */

EXPORT_C size_t

fwrite (const void *buf, size_t size, size_t count, FILE * fp)

{

  size_t n;

  struct __suio uio;

  struct __siov iov;

  iov.iov_base = buf;

  uio.uio_resid = iov.iov_len = n = count * size;

  uio.uio_iov = &iov;

  uio.uio_iovcnt = 1;

  /*

   * The usual case is success (__sfvwrite returns 0);

   * skip the divide if this happens, since divides are

   * generally slow and since this occurs whenever size==0.

   */

  if (__sfvwrite (fp, &uio) == 0)

    return count;

  return (n - uio.uio_resid) / size;

}