1/* 2 * Copyright (c) 1999 Global Technology Associates, Inc. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 17 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS 18 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, 19 * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT 20 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR 21 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 22 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE 23 * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, 24 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 * 26 * $FreeBSD$ 27 */ 28 29#include <err.h> 30#include <string.h> 31#include <unistd.h> 32 33#include "kgzip.h" 34 35/* 36 * Close a file. 37 */ 38void 39xclose(const struct iodesc *id) 40{ 41 if (close(id->fd)) 42 err(1, "%s", id->fname); 43} 44 45/* 46 * Copy bytes from one file to another. 47 */ 48void 49xcopy(const struct iodesc * idi, const struct iodesc * ido, 50 size_t nbyte, off_t offset) 51{ 52 char buf[8192]; 53 size_t n; 54 55 while (nbyte) { 56 if ((n = sizeof(buf)) > nbyte) 57 n = nbyte; 58 if (xread(idi, buf, n, offset) != n) 59 errx(1, "%s: Short read", idi->fname); 60 xwrite(ido, buf, n); 61 nbyte -= n; 62 offset = -1; 63 } 64} 65 66/* 67 * Write binary zeroes to a file. 68 */ 69void 70xzero(const struct iodesc * id, size_t nbyte) 71{ 72 char buf[8192]; 73 size_t n; 74 75 memset(buf, 0, sizeof(buf)); 76 while (nbyte) { 77 if ((n = sizeof(buf)) > nbyte) 78 n = nbyte; 79 xwrite(id, buf, n); 80 nbyte -= n; 81 } 82} 83 84/* 85 * Read from a file. 86 */ 87size_t 88xread(const struct iodesc * id, void *buf, size_t nbyte, off_t offset) 89{ 90 ssize_t n; 91 92 if (offset != -1 && lseek(id->fd, offset, SEEK_SET) != offset) 93 err(1, "%s", id->fname); 94 if ((n = read(id->fd, buf, nbyte)) == -1) 95 err(1, "%s", id->fname); 96 return (size_t)n; 97} 98 99/* 100 * Write to a file. 101 */ 102void 103xwrite(const struct iodesc * id, const void *buf, size_t nbyte) 104{ 105 ssize_t n; 106 107 if ((n = write(id->fd, buf, nbyte)) == -1) 108 err(1, "%s", id->fname); 109 if ((size_t)n != nbyte) 110 errx(1, "%s: Short write", id->fname); 111} 112 113/* 114 * Reposition within a file. 115 */ 116void 117xseek(const struct iodesc *id, off_t offset) 118{ 119 if (lseek(id->fd, offset, SEEK_SET) != offset) 120 err(1, "%s", id->fname); 121} 122