2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (c) 1999 Global Technology Associates, Inc.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
19 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS
20 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
21 * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
22 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
23 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
24 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
25 * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
26 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
41 xclose(const struct iodesc *id)
44 err(1, "%s", id->fname);
48 * Copy bytes from one file to another.
51 xcopy(const struct iodesc * idi, const struct iodesc * ido,
52 size_t nbyte, off_t offset)
58 if ((n = sizeof(buf)) > nbyte)
60 if (xread(idi, buf, n, offset) != n)
61 errx(1, "%s: Short read", idi->fname);
69 * Write binary zeroes to a file.
72 xzero(const struct iodesc * id, size_t nbyte)
77 memset(buf, 0, sizeof(buf));
79 if ((n = sizeof(buf)) > nbyte)
90 xread(const struct iodesc * id, void *buf, size_t nbyte, off_t offset)
94 if (offset != -1 && lseek(id->fd, offset, SEEK_SET) != offset)
95 err(1, "%s", id->fname);
96 if ((n = read(id->fd, buf, nbyte)) == -1)
97 err(1, "%s", id->fname);
105 xwrite(const struct iodesc * id, const void *buf, size_t nbyte)
109 if ((n = write(id->fd, buf, nbyte)) == -1)
110 err(1, "%s", id->fname);
111 if ((size_t)n != nbyte)
112 errx(1, "%s: Short write", id->fname);
116 * Reposition within a file.
119 xseek(const struct iodesc *id, off_t offset)
121 if (lseek(id->fd, offset, SEEK_SET) != offset)
122 err(1, "%s", id->fname);