1 /** @file 2 Implementation of fwrite as declared in <stdio.h>. 3 4 Copyright (c) 2010 - 2011, Intel Corporation. All rights reserved.<BR> 5 This program and the accompanying materials are licensed and made available 6 under the terms and conditions of the BSD License that accompanies this 7 distribution. The full text of the license may be found at 8 http://opensource.org/licenses/bsd-license. 9 10 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, 11 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. 12 13 Copyright (c) 1990, 1993 14 The Regents of the University of California. All rights reserved. 15 16 This code is derived from software contributed to Berkeley by 17 Chris Torek. 18 19 Redistribution and use in source and binary forms, with or without 20 modification, are permitted provided that the following conditions 21 are met: 22 - Redistributions of source code must retain the above copyright 23 notice, this list of conditions and the following disclaimer. 24 - Redistributions in binary form must reproduce the above copyright 25 notice, this list of conditions and the following disclaimer in the 26 documentation and/or other materials provided with the distribution. 27 - Neither the name of the University nor the names of its contributors 28 may be used to endorse or promote products derived from this software 29 without specific prior written permission. 30 31 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 32 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 33 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 34 ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE 35 LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 36 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 37 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 38 INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 39 CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 40 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 41 POSSIBILITY OF SUCH DAMAGE. 42 43 NetBSD: fwrite.c,v 1.16 2005/11/29 03:12:00 christos Exp 44 fwrite.c 8.1 (Berkeley) 6/4/93 45 **/ 46 #include <LibConfig.h> 47 48 #include <assert.h> 49 #include <errno.h> 50 #include <stdio.h> 51 #include "reentrant.h" 52 #include "local.h" 53 #include "fvwrite.h" 54 55 /* 56 * Write `count' objects (each size `size') from memory to the given file. 57 * Return the number of whole objects written. 58 */ 59 size_t 60 fwrite(const void *buf, size_t size, size_t count, FILE *fp) 61 { 62 size_t n; 63 struct __suio uio; 64 struct __siov iov; 65 66 _DIAGASSERT(fp != NULL); 67 if(fp == NULL) { 68 errno = EINVAL; 69 return (0); 70 } 71 72 /* 73 * SUSv2 requires a return value of 0 for a count or a size of 0. 74 */ 75 if ((n = count * size) == 0) 76 return (0); 77 _DIAGASSERT(buf != NULL); 78 79 iov.iov_base = __UNCONST(buf); 80 uio.uio_resid = (int)(iov.iov_len = n); 81 uio.uio_iov = &iov; 82 uio.uio_iovcnt = 1; 83 84 /* 85 * The usual case is success (__sfvwrite returns 0); 86 * skip the divide if this happens, since divides are 87 * generally slow and since this occurs whenever size==0. 88 */ 89 FLOCKFILE(fp); 90 if (__sfvwrite(fp, &uio) != 0) 91 count = ((n - uio.uio_resid) / size); 92 FUNLOCKFILE(fp); 93 return (count); 94 } 95
