fwrite.c revision 13545
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) 381573Srgrimesstatic char sccsid[] = "@(#)fwrite.c 8.1 (Berkeley) 6/4/93"; 391573Srgrimes#endif /* LIBC_SCCS and not lint */ 401573Srgrimes 411573Srgrimes#include <stdio.h> 421573Srgrimes#include "local.h" 431573Srgrimes#include "fvwrite.h" 4413545Sjulian#ifdef _THREAD_SAFE 4513545Sjulian#include <pthread.h> 4613545Sjulian#include "pthread_private.h" 4713545Sjulian#endif 481573Srgrimes 491573Srgrimes/* 501573Srgrimes * Write `count' objects (each size `size') from memory to the given file. 511573Srgrimes * Return the number of whole objects written. 521573Srgrimes */ 531573Srgrimessize_t 541573Srgrimesfwrite(buf, size, count, fp) 551573Srgrimes const void *buf; 561573Srgrimes size_t size, count; 571573Srgrimes FILE *fp; 581573Srgrimes{ 591573Srgrimes size_t n; 601573Srgrimes struct __suio uio; 611573Srgrimes struct __siov iov; 621573Srgrimes 631573Srgrimes iov.iov_base = (void *)buf; 641573Srgrimes uio.uio_resid = iov.iov_len = n = count * size; 651573Srgrimes uio.uio_iov = &iov; 661573Srgrimes uio.uio_iovcnt = 1; 671573Srgrimes 6813545Sjulian#ifdef _THREAD_SAFE 6913545Sjulian _thread_flockfile(fp,__FILE__,__LINE__); 7013545Sjulian#endif 711573Srgrimes /* 721573Srgrimes * The usual case is success (__sfvwrite returns 0); 731573Srgrimes * skip the divide if this happens, since divides are 741573Srgrimes * generally slow and since this occurs whenever size==0. 751573Srgrimes */ 7613545Sjulian if (__sfvwrite(fp, &uio) != 0) 7713545Sjulian count = (n - uio.uio_resid) / size; 7813545Sjulian#ifdef _THREAD_SAFE 7913545Sjulian _thread_funlockfile(fp); 8013545Sjulian#endif 8113545Sjulian return (count); 821573Srgrimes} 83