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. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 * 32 * @(#)fwrite.c 8.1 (Berkeley) 6/4/93 33 * $FreeBSD: src/lib/libc/stdio/fwrite.c,v 1.12 2007/01/09 00:28:06 imp Exp $ 34 */ 35 36 #include "namespace.h" 37 #include <stdio.h> 38 #include "un-namespace.h" 39 #include "local.h" 40 #include "libc_private.h" 41 42 /* 43 * Write `count' objects (each size `size') from memory to the given file. 44 * Return the number of whole objects written. 45 */ 46 size_t 47 fwrite_unlocked(const void * __restrict buf, size_t size, size_t count, 48 FILE * __restrict fp) 49 { 50 size_t n; 51 struct __suio uio; 52 struct __siov iov; 53 54 iov.iov_base = __DECONST(void *, buf); 55 uio.uio_resid = iov.iov_len = n = count * size; 56 uio.uio_iov = &iov; 57 uio.uio_iovcnt = 1; 58 59 ORIENT(fp, -1); 60 /* 61 * The usual case is success (__sfvwrite returns 0); 62 * skip the divide if this happens, since divides are 63 * generally slow and since this occurs whenever size==0. 64 */ 65 if (__sfvwrite(fp, &uio) != 0) 66 count = (n - uio.uio_resid) / size; 67 return (count); 68 } 69 70 size_t 71 fwrite(const void * __restrict buf, size_t size, size_t count, 72 FILE * __restrict fp) 73 { 74 size_t n; 75 76 FLOCKFILE(fp); 77 n = fwrite_unlocked(buf, size, count, fp); 78 FUNLOCKFILE(fp); 79 return (n); 80 } 81