2 * Copyright (c) 1999 Global Technology Associates, Inc.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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.
39 xclose(const struct iodesc *id)
42 err(1, "%s", id->fname);
46 * Copy bytes from one file to another.
49 xcopy(const struct iodesc * idi, const struct iodesc * ido,
50 size_t nbyte, off_t offset)
56 if ((n = sizeof(buf)) > nbyte)
58 if (xread(idi, buf, n, offset) != n)
59 errx(1, "%s: Short read", idi->fname);
67 * Write binary zeroes to a file.
70 xzero(const struct iodesc * id, size_t nbyte)
75 memset(buf, 0, sizeof(buf));
77 if ((n = sizeof(buf)) > nbyte)
88 xread(const struct iodesc * id, void *buf, size_t nbyte, off_t offset)
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);
103 xwrite(const struct iodesc * id, const void *buf, size_t nbyte)
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);
114 * Reposition within a file.
117 xseek(const struct iodesc *id, off_t offset)
119 if (lseek(id->fd, offset, SEEK_SET) != offset)
120 err(1, "%s", id->fname);