| Vishal Bhoj | 82c8071 | 2015-12-15 21:13:33 +0530 | [diff] [blame] | 1 | /** @file
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| 2 | Implementation of fwrite as declared in <stdio.h>.
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| 3 |
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| 4 | Copyright (c) 2010 - 2011, Intel Corporation. All rights reserved.<BR>
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| 5 | This program and the accompanying materials are licensed and made available
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| 6 | under the terms and conditions of the BSD License that accompanies this
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| 7 | distribution. The full text of the license may be found at
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| 8 | http://opensource.org/licenses/bsd-license.
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| 9 |
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| 10 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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| 11 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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| 12 |
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| 13 | Copyright (c) 1990, 1993
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| 14 | The Regents of the University of California. All rights reserved.
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| 15 |
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| 16 | This code is derived from software contributed to Berkeley by
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| 17 | Chris Torek.
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| 18 |
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| 19 | Redistribution and use in source and binary forms, with or without
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| 20 | modification, are permitted provided that the following conditions
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| 21 | are met:
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| 22 | - Redistributions of source code must retain the above copyright
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| 23 | notice, this list of conditions and the following disclaimer.
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| 24 | - Redistributions in binary form must reproduce the above copyright
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| 25 | notice, this list of conditions and the following disclaimer in the
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| 26 | documentation and/or other materials provided with the distribution.
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| 27 | - Neither the name of the University nor the names of its contributors
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| 28 | may be used to endorse or promote products derived from this software
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| 29 | without specific prior written permission.
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| 30 |
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| 31 | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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| 32 | AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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| 33 | IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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| 34 | ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE
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| 35 | LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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| 36 | CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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| 37 | SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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| 38 | INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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| 39 | CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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| 40 | ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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| 41 | POSSIBILITY OF SUCH DAMAGE.
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| 42 |
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| 43 | NetBSD: fwrite.c,v 1.16 2005/11/29 03:12:00 christos Exp
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| 44 | fwrite.c 8.1 (Berkeley) 6/4/93
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| 45 | **/
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| 46 | #include <LibConfig.h>
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| 47 |
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| 48 | #include <assert.h>
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| 49 | #include <errno.h>
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| 50 | #include <stdio.h>
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| 51 | #include "reentrant.h"
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| 52 | #include "local.h"
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| 53 | #include "fvwrite.h"
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| 54 |
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| 55 | /*
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| 56 | * Write `count' objects (each size `size') from memory to the given file.
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| 57 | * Return the number of whole objects written.
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| 58 | */
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| 59 | size_t
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| 60 | fwrite(const void *buf, size_t size, size_t count, FILE *fp)
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| 61 | {
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| 62 | size_t n;
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| 63 | struct __suio uio;
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| 64 | struct __siov iov;
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| 65 |
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| 66 | _DIAGASSERT(fp != NULL);
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| 67 | if(fp == NULL) {
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| 68 | errno = EINVAL;
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| 69 | return (0);
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| 70 | }
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| 71 |
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| 72 | /*
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| 73 | * SUSv2 requires a return value of 0 for a count or a size of 0.
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| 74 | */
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| 75 | if ((n = count * size) == 0)
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| 76 | return (0);
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| 77 | _DIAGASSERT(buf != NULL);
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| 78 |
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| 79 | iov.iov_base = __UNCONST(buf);
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| 80 | uio.uio_resid = (int)(iov.iov_len = n);
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| 81 | uio.uio_iov = &iov;
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| 82 | uio.uio_iovcnt = 1;
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| 83 |
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| 84 | /*
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| 85 | * The usual case is success (__sfvwrite returns 0);
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| 86 | * skip the divide if this happens, since divides are
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| 87 | * generally slow and since this occurs whenever size==0.
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| 88 | */
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| 89 | FLOCKFILE(fp);
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| 90 | if (__sfvwrite(fp, &uio) != 0)
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| 91 | count = ((n - uio.uio_resid) / size);
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| 92 | FUNLOCKFILE(fp);
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| 93 | return (count);
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| 94 | }
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