1 /*- 2 * Copyright (c) 1990, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * Chris Torek. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * @(#)fwrite.c 8.1 (Berkeley) 6/4/93 37 * $FreeBSD: src/lib/libc/stdio/fwrite.c,v 1.7 1999/08/28 00:01:07 peter Exp $ 38 * $DragonFly: src/lib/libc/stdio/fwrite.c,v 1.5 2005/07/23 20:23:06 joerg Exp $ 39 */ 40 41 #include "namespace.h" 42 #include <sys/types.h> 43 #include <stdio.h> 44 #include "un-namespace.h" 45 #include "local.h" 46 #include "priv_stdio.h" 47 #include "libc_private.h" 48 49 /* 50 * Write `count' objects (each size `size') from memory to the given file. 51 * Return the number of whole objects written. 52 */ 53 size_t 54 fwrite(const void *buf, size_t size, size_t count, FILE *fp) 55 { 56 size_t n; 57 struct __suio uio; 58 struct __siov iov; 59 60 iov.iov_base = __DECONST(void *, buf); 61 uio.uio_resid = iov.iov_len = n = count * size; 62 uio.uio_iov = &iov; 63 uio.uio_iovcnt = 1; 64 65 FLOCKFILE(fp); 66 /* 67 * The usual case is success (__sfvwrite returns 0); 68 * skip the divide if this happens, since divides are 69 * generally slow and since this occurs whenever size==0. 70 */ 71 if (__sfvwrite(fp, &uio) != 0) 72 count = (n - uio.uio_resid) / size; 73 FUNLOCKFILE(fp); 74 return (count); 75 } 76