fwrite.c revision 71579
11573Srgrimes/*- 21573Srgrimes * Copyright (c) 1990, 1993 31573Srgrimes * The Regents of the University of California. All rights reserved. 41573Srgrimes * 51573Srgrimes * This code is derived from software contributed to Berkeley by 61573Srgrimes * Chris Torek. 71573Srgrimes * 81573Srgrimes * Redistribution and use in source and binary forms, with or without 91573Srgrimes * modification, are permitted provided that the following conditions 101573Srgrimes * are met: 111573Srgrimes * 1. Redistributions of source code must retain the above copyright 121573Srgrimes * notice, this list of conditions and the following disclaimer. 131573Srgrimes * 2. Redistributions in binary form must reproduce the above copyright 141573Srgrimes * notice, this list of conditions and the following disclaimer in the 151573Srgrimes * documentation and/or other materials provided with the distribution. 161573Srgrimes * 3. All advertising materials mentioning features or use of this software 171573Srgrimes * must display the following acknowledgement: 181573Srgrimes * This product includes software developed by the University of 191573Srgrimes * California, Berkeley and its contributors. 201573Srgrimes * 4. Neither the name of the University nor the names of its contributors 211573Srgrimes * may be used to endorse or promote products derived from this software 221573Srgrimes * without specific prior written permission. 231573Srgrimes * 241573Srgrimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 251573Srgrimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 261573Srgrimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 271573Srgrimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 281573Srgrimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 291573Srgrimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 301573Srgrimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 311573Srgrimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 321573Srgrimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 331573Srgrimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 341573Srgrimes * SUCH DAMAGE. 351573Srgrimes */ 361573Srgrimes 371573Srgrimes#if defined(LIBC_SCCS) && !defined(lint) 3816586Sjraynard#if 0 391573Srgrimesstatic char sccsid[] = "@(#)fwrite.c 8.1 (Berkeley) 6/4/93"; 4016586Sjraynard#endif 4116586Sjraynardstatic const char rcsid[] = 4250476Speter "$FreeBSD: head/lib/libc/stdio/fwrite.c 71579 2001-01-24 13:01:12Z deischen $"; 431573Srgrimes#endif /* LIBC_SCCS and not lint */ 441573Srgrimes 4571579Sdeischen#include "namespace.h" 461573Srgrimes#include <stdio.h> 4771579Sdeischen#include "un-namespace.h" 481573Srgrimes#include "local.h" 491573Srgrimes#include "fvwrite.h" 5035129Sjb#include "libc_private.h" 511573Srgrimes 521573Srgrimes/* 531573Srgrimes * Write `count' objects (each size `size') from memory to the given file. 541573Srgrimes * Return the number of whole objects written. 551573Srgrimes */ 561573Srgrimessize_t 571573Srgrimesfwrite(buf, size, count, fp) 581573Srgrimes const void *buf; 591573Srgrimes size_t size, count; 601573Srgrimes FILE *fp; 611573Srgrimes{ 621573Srgrimes size_t n; 631573Srgrimes struct __suio uio; 641573Srgrimes struct __siov iov; 651573Srgrimes 661573Srgrimes iov.iov_base = (void *)buf; 671573Srgrimes uio.uio_resid = iov.iov_len = n = count * size; 681573Srgrimes uio.uio_iov = &iov; 691573Srgrimes uio.uio_iovcnt = 1; 701573Srgrimes 7135129Sjb FLOCKFILE(fp); 721573Srgrimes /* 731573Srgrimes * The usual case is success (__sfvwrite returns 0); 741573Srgrimes * skip the divide if this happens, since divides are 751573Srgrimes * generally slow and since this occurs whenever size==0. 761573Srgrimes */ 7713545Sjulian if (__sfvwrite(fp, &uio) != 0) 7813545Sjulian count = (n - uio.uio_resid) / size; 7935129Sjb FUNLOCKFILE(fp); 8013545Sjulian return (count); 811573Srgrimes} 82