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[/] [or1k/] [trunk/] [newlib-1.10.0/] [newlib/] [libc/] [stdio/] [fwrite.c] - Diff between revs 1010 and 1765

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/*
/*
 * Copyright (c) 1990 The Regents of the University of California.
 * Copyright (c) 1990 The Regents of the University of California.
 * All rights reserved.
 * All rights reserved.
 *
 *
 * Redistribution and use in source and binary forms are permitted
 * Redistribution and use in source and binary forms are permitted
 * provided that the above copyright notice and this paragraph are
 * provided that the above copyright notice and this paragraph are
 * duplicated in all such forms and that any documentation,
 * duplicated in all such forms and that any documentation,
 * advertising materials, and other materials related to such
 * advertising materials, and other materials related to such
 * distribution and use acknowledge that the software was developed
 * distribution and use acknowledge that the software was developed
 * by the University of California, Berkeley.  The name of the
 * by the University of California, Berkeley.  The name of the
 * University may not be used to endorse or promote products derived
 * University may not be used to endorse or promote products derived
 * from this software without specific prior written permission.
 * from this software without specific prior written permission.
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 */
 */
 
 
/*
/*
FUNCTION
FUNCTION
<<fwrite>>---write array elements
<<fwrite>>---write array elements
 
 
INDEX
INDEX
        fwrite
        fwrite
 
 
ANSI_SYNOPSIS
ANSI_SYNOPSIS
        #include <stdio.h>
        #include <stdio.h>
        size_t fwrite(const void *<[buf]>, size_t <[size]>,
        size_t fwrite(const void *<[buf]>, size_t <[size]>,
                      size_t <[count]>, FILE *<[fp]>);
                      size_t <[count]>, FILE *<[fp]>);
 
 
TRAD_SYNOPSIS
TRAD_SYNOPSIS
        #include <stdio.h>
        #include <stdio.h>
        size_t fwrite(<[buf]>, <[size]>, <[count]>, <[fp]>)
        size_t fwrite(<[buf]>, <[size]>, <[count]>, <[fp]>)
        char *<[buf]>;
        char *<[buf]>;
        size_t <[size]>;
        size_t <[size]>;
        size_t <[count]>;
        size_t <[count]>;
        FILE *<[fp]>;
        FILE *<[fp]>;
 
 
DESCRIPTION
DESCRIPTION
<<fwrite>> attempts to copy, starting from the memory location
<<fwrite>> attempts to copy, starting from the memory location
<[buf]>, <[count]> elements (each of size <[size]>) into the file or
<[buf]>, <[count]> elements (each of size <[size]>) into the file or
stream identified by <[fp]>.  <<fwrite>> may copy fewer elements than
stream identified by <[fp]>.  <<fwrite>> may copy fewer elements than
<[count]> if an error intervenes.
<[count]> if an error intervenes.
 
 
<<fwrite>> also advances the file position indicator (if any) for
<<fwrite>> also advances the file position indicator (if any) for
<[fp]> by the number of @emph{characters} actually written.
<[fp]> by the number of @emph{characters} actually written.
 
 
RETURNS
RETURNS
If <<fwrite>> succeeds in writing all the elements you specify, the
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 same as the argument <[count]>.  In any event, the
result is the number of complete elements that <<fwrite>> copied to
result is the number of complete elements that <<fwrite>> copied to
the file.
the file.
 
 
PORTABILITY
PORTABILITY
ANSI C requires <<fwrite>>.
ANSI C requires <<fwrite>>.
 
 
Supporting OS subroutines required: <<close>>, <<fstat>>, <<isatty>>,
Supporting OS subroutines required: <<close>>, <<fstat>>, <<isatty>>,
<<lseek>>, <<read>>, <<sbrk>>, <<write>>.
<<lseek>>, <<read>>, <<sbrk>>, <<write>>.
*/
*/
 
 
#if defined(LIBC_SCCS) && !defined(lint)
#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "%W% (Berkeley) %G%";
static char sccsid[] = "%W% (Berkeley) %G%";
#endif /* LIBC_SCCS and not lint */
#endif /* LIBC_SCCS and not lint */
 
 
#include <stdio.h>
#include <stdio.h>
#include <string.h>
#include <string.h>
#if 0
#if 0
#include <sys/stdc.h>
#include <sys/stdc.h>
#endif
#endif
#include "local.h"
#include "local.h"
#if 1
#if 1
#include "fvwrite.h"
#include "fvwrite.h"
#endif
#endif
 
 
/*
/*
 * Write `count' objects (each size `size') from memory to the given file.
 * Write `count' objects (each size `size') from memory to the given file.
 * Return the number of whole objects written.
 * Return the number of whole objects written.
 */
 */
 
 
size_t
size_t
_DEFUN (fwrite, (buf, size, count, fp),
_DEFUN (fwrite, (buf, size, count, fp),
        _CONST _PTR buf _AND
        _CONST _PTR buf _AND
        size_t size _AND
        size_t size _AND
        size_t count _AND
        size_t count _AND
        FILE * fp)
        FILE * fp)
{
{
  size_t n;
  size_t n;
  struct __suio uio;
  struct __suio uio;
  struct __siov iov;
  struct __siov iov;
 
 
  iov.iov_base = buf;
  iov.iov_base = buf;
  uio.uio_resid = iov.iov_len = n = count * size;
  uio.uio_resid = iov.iov_len = n = count * size;
  uio.uio_iov = &iov;
  uio.uio_iov = &iov;
  uio.uio_iovcnt = 1;
  uio.uio_iovcnt = 1;
 
 
  /*
  /*
   * The usual case is success (__sfvwrite returns 0);
   * The usual case is success (__sfvwrite returns 0);
   * skip the divide if this happens, since divides are
   * skip the divide if this happens, since divides are
   * generally slow and since this occurs whenever size==0.
   * generally slow and since this occurs whenever size==0.
   */
   */
 
 
  if (__sfvwrite (fp, &uio) == 0)
  if (__sfvwrite (fp, &uio) == 0)
    return count;
    return count;
  return (n - uio.uio_resid) / size;
  return (n - uio.uio_resid) / size;
}
}
 
 

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