Skip to content

HTTPS clone URL

Subversion checkout URL

You can clone with HTTPS or Subversion.

Download ZIP
Fetching contributors…

Cannot retrieve contributors at this time

123 lines (110 sloc) 3.132 kb
/*
* Copyright (c) 1999 Global Technology Associates, Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
* OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* $FreeBSD: src/usr.sbin/kgzip/xio.c,v 1.2.2.1 2001/07/19 04:42:38 kris Exp $
* $DragonFly: src/usr.sbin/kgzip/xio.c,v 1.2 2003/06/17 04:29:55 dillon Exp $
*/
#include <err.h>
#include <string.h>
#include <unistd.h>
#include "kgzip.h"
/*
* Close a file.
*/
void
xclose(const struct iodesc *id)
{
if (close(id->fd))
err(1, "%s", id->fname);
}
/*
* Copy bytes from one file to another.
*/
void
xcopy(const struct iodesc * idi, const struct iodesc * ido,
size_t nbyte, off_t offset)
{
char buf[8192];
size_t n;
while (nbyte) {
if ((n = sizeof(buf)) > nbyte)
n = nbyte;
if (xread(idi, buf, n, offset) != n)
errx(1, "%s: Short read", idi->fname);
xwrite(ido, buf, n);
nbyte -= n;
offset = -1;
}
}
/*
* Write binary zeroes to a file.
*/
void
xzero(const struct iodesc * id, size_t nbyte)
{
char buf[8192];
size_t n;
memset(buf, 0, sizeof(buf));
while (nbyte) {
if ((n = sizeof(buf)) > nbyte)
n = nbyte;
xwrite(id, buf, n);
nbyte -= n;
}
}
/*
* Read from a file.
*/
size_t
xread(const struct iodesc * id, void *buf, size_t nbyte, off_t offset)
{
ssize_t n;
if (offset != -1 && lseek(id->fd, offset, SEEK_SET) != offset)
err(1, "%s", id->fname);
if ((n = read(id->fd, buf, nbyte)) == -1)
err(1, "%s", id->fname);
return (size_t)n;
}
/*
* Write to a file.
*/
void
xwrite(const struct iodesc * id, const void *buf, size_t nbyte)
{
ssize_t n;
if ((n = write(id->fd, buf, nbyte)) == -1)
err(1, "%s", id->fname);
if ((size_t)n != nbyte)
errx(1, "%s: Short write", id->fname);
}
/*
* Reposition within a file.
*/
void
xseek(const struct iodesc *id, off_t offset)
{
if (lseek(id->fd, offset, SEEK_SET) != offset)
err(1, "%s", id->fname);
}
Jump to Line
Something went wrong with that request. Please try again.