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