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/*

 * 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>>.

*/

#if defined(LIBC_SCCS) && !defined(lint)

static char sccsid[] = "%W% (Berkeley) %G%";

#endif /* LIBC_SCCS and not lint */

#include <stdio.h>

#include <string.h>

#if 0

#include <sys/stdc.h>

#endif

#include "local.h"

#if 1

#include "fvwrite.h"

#endif

/*

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

 * Return the number of whole objects written.

 */

size_t

_DEFUN (fwrite, (buf, size, count, fp),

        _CONST _PTR buf _AND

        size_t size _AND

        size_t count _AND

        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;

}