1792ae72e41923800ba8797d87a76346cb2de14b9Elliott Hughes/* $OpenBSD: fwrite.c,v 1.11 2014/05/01 16:40:36 deraadt Exp $ */ 21dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project/*- 31dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * Copyright (c) 1990, 1993 41dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * The Regents of the University of California. All rights reserved. 51dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * 61dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * This code is derived from software contributed to Berkeley by 71dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * Chris Torek. 81dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * 91dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * Redistribution and use in source and binary forms, with or without 101dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * modification, are permitted provided that the following conditions 111dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * are met: 121dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * 1. Redistributions of source code must retain the above copyright 131dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * notice, this list of conditions and the following disclaimer. 141dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * 2. Redistributions in binary form must reproduce the above copyright 151dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * notice, this list of conditions and the following disclaimer in the 161dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * documentation and/or other materials provided with the distribution. 17b2e1abda0503874a5bb097e0b55ad4f8ce211a8dElliott Hughes * 3. Neither the name of the University nor the names of its contributors 181dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * may be used to endorse or promote products derived from this software 191dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * without specific prior written permission. 201dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * 211dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 221dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 231dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 241dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 251dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 261dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 271dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 281dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 291dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 301dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 311dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * SUCH DAMAGE. 321dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project */ 331dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 341dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#include <stdio.h> 35792ae72e41923800ba8797d87a76346cb2de14b9Elliott Hughes#include <stdlib.h> 36792ae72e41923800ba8797d87a76346cb2de14b9Elliott Hughes#include <stdint.h> 37792ae72e41923800ba8797d87a76346cb2de14b9Elliott Hughes#include <errno.h> 381dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#include "local.h" 391dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#include "fvwrite.h" 40792ae72e41923800ba8797d87a76346cb2de14b9Elliott Hughes 41792ae72e41923800ba8797d87a76346cb2de14b9Elliott Hughes#define MUL_NO_OVERFLOW (1UL << (sizeof(size_t) * 4)) 421dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 431dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project/* 441dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * Write `count' objects (each size `size') from memory to the given file. 451dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * Return the number of whole objects written. 461dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project */ 471dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Projectsize_t 48792ae72e41923800ba8797d87a76346cb2de14b9Elliott Hughesfwrite(const void *buf, size_t size, size_t count, FILE *fp) 491dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project{ 501dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project size_t n; 511dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project struct __suio uio; 521dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project struct __siov iov; 53792ae72e41923800ba8797d87a76346cb2de14b9Elliott Hughes int ret; 546b05c8e28017518fae04a3a601d0d245916561d2Elliott Hughes 556b05c8e28017518fae04a3a601d0d245916561d2Elliott Hughes /* 56792ae72e41923800ba8797d87a76346cb2de14b9Elliott Hughes * Extension: Catch integer overflow 576b05c8e28017518fae04a3a601d0d245916561d2Elliott Hughes */ 58792ae72e41923800ba8797d87a76346cb2de14b9Elliott Hughes if ((size >= MUL_NO_OVERFLOW || count >= MUL_NO_OVERFLOW) && 59792ae72e41923800ba8797d87a76346cb2de14b9Elliott Hughes size > 0 && SIZE_MAX / size < count) { 60792ae72e41923800ba8797d87a76346cb2de14b9Elliott Hughes errno = EOVERFLOW; 61792ae72e41923800ba8797d87a76346cb2de14b9Elliott Hughes fp->_flags |= __SERR; 626b05c8e28017518fae04a3a601d0d245916561d2Elliott Hughes return (0); 63792ae72e41923800ba8797d87a76346cb2de14b9Elliott Hughes } 646b05c8e28017518fae04a3a601d0d245916561d2Elliott Hughes 656b05c8e28017518fae04a3a601d0d245916561d2Elliott Hughes /* 66792ae72e41923800ba8797d87a76346cb2de14b9Elliott Hughes * ANSI and SUSv2 require a return value of 0 if size or count are 0. 676b05c8e28017518fae04a3a601d0d245916561d2Elliott Hughes */ 68792ae72e41923800ba8797d87a76346cb2de14b9Elliott Hughes if ((n = count * size) == 0) 696b05c8e28017518fae04a3a601d0d245916561d2Elliott Hughes return (0); 701dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 711dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project iov.iov_base = (void *)buf; 726b05c8e28017518fae04a3a601d0d245916561d2Elliott Hughes uio.uio_resid = iov.iov_len = n; 731dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project uio.uio_iov = &iov; 741dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project uio.uio_iovcnt = 1; 751dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 761dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project /* 771dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * The usual case is success (__sfvwrite returns 0); 781dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * skip the divide if this happens, since divides are 791dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * generally slow and since this occurs whenever size==0. 801dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project */ 81792ae72e41923800ba8797d87a76346cb2de14b9Elliott Hughes FLOCKFILE(fp); 82792ae72e41923800ba8797d87a76346cb2de14b9Elliott Hughes _SET_ORIENTATION(fp, -1); 83792ae72e41923800ba8797d87a76346cb2de14b9Elliott Hughes ret = __sfvwrite(fp, &uio); 84f582340a6a48588aa50da17e1620e8f91b146941Kenny Root FUNLOCKFILE(fp); 85792ae72e41923800ba8797d87a76346cb2de14b9Elliott Hughes if (ret == 0) 86792ae72e41923800ba8797d87a76346cb2de14b9Elliott Hughes return (count); 87792ae72e41923800ba8797d87a76346cb2de14b9Elliott Hughes return ((n - uio.uio_resid) / size); 881dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 89