122 lines
2.9 KiB
C
122 lines
2.9 KiB
C
/*
|
|
* 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.
|
|
*
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
#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);
|
|
}
|