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fwrite.c revision 1.5 
      1 /*	$NetBSD: fwrite.c,v 1.5 1995/02/02 02:09:51 jtc Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1990, 1993
      5  *	The Regents of the University of California.  All rights reserved.
      6  *
      7  * This code is derived from software contributed to Berkeley by
      8  * Chris Torek.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  * 3. All advertising materials mentioning features or use of this software
     19  *    must display the following acknowledgement:
     20  *	This product includes software developed by the University of
     21  *	California, Berkeley and its contributors.
     22  * 4. Neither the name of the University nor the names of its contributors
     23  *    may be used to endorse or promote products derived from this software
     24  *    without specific prior written permission.
     25  *
     26  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     27  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     28  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     29  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     30  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     31  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     32  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     33  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     34  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     35  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     36  * SUCH DAMAGE.
     37  */
     38 
     39 #if defined(LIBC_SCCS) && !defined(lint)
     40 #if 0
     41 static char sccsid[] = "@(#)fwrite.c	8.1 (Berkeley) 6/4/93";
     42 #endif
     43 static char rcsid[] = "$NetBSD: fwrite.c,v 1.5 1995/02/02 02:09:51 jtc Exp $";
     44 #endif /* LIBC_SCCS and not lint */
     45 
     46 #include <stdio.h>
     47 #include "local.h"
     48 #include "fvwrite.h"
     49 
     50 /*
     51  * Write `count' objects (each size `size') from memory to the given file.
     52  * Return the number of whole objects written.
     53  */
     54 size_t
     55 fwrite(buf, size, count, fp)
     56 	const void *buf;
     57 	size_t size, count;
     58 	FILE *fp;
     59 {
     60 	size_t n;
     61 	struct __suio uio;
     62 	struct __siov iov;
     63 
     64 	iov.iov_base = (void *)buf;
     65 	uio.uio_resid = iov.iov_len = n = count * size;
     66 	uio.uio_iov = &iov;
     67 	uio.uio_iovcnt = 1;
     68 
     69 	/*
     70 	 * The usual case is success (__sfvwrite returns 0);
     71 	 * skip the divide if this happens, since divides are
     72 	 * generally slow and since this occurs whenever size==0.
     73 	 */
     74 	if (__sfvwrite(fp, &uio) == 0)
     75 		return (count);
     76 	return ((n - uio.uio_resid) / size);
     77 }
     78