2 * Copyright (c) 1991, 1993
3 * The Regents of the University of California. All rights reserved.
5 * This code is derived from software contributed to Berkeley by
6 * Edward Sze-Tyan Wang.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. All advertising materials mentioning features or use of this software
17 * must display the following acknowledgement:
18 * This product includes software developed by the University of
19 * California, Berkeley and its contributors.
20 * 4. Neither the name of the University nor the names of its contributors
21 * may be used to endorse or promote products derived from this software
22 * without specific prior written permission.
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
37 #include <sys/cdefs.h>
39 __FBSDID("$FreeBSD$");
42 static const char sccsid[] = "@(#)misc.c 8.1 (Berkeley) 6/6/93";
45 #include <sys/types.h>
59 ierr(const char *fname)
72 * Print `len' bytes from the file associated with `mip', starting at
73 * absolute file offset `startoff'. May move map window.
76 mapprint(struct mapinfo *mip, off_t startoff, off_t len)
81 if (startoff < mip->mapoff || startoff >= mip->mapoff +
83 if (maparound(mip, startoff) != 0)
86 n = (mip->mapoff + mip->maplen) - startoff;
89 WR(mip->start + (startoff - mip->mapoff), n);
97 * Move the map window so that it contains the byte at absolute file
98 * offset `offset'. The start of the map window will be TAILMAPLEN
102 maparound(struct mapinfo *mip, off_t offset)
105 if (mip->start != NULL && munmap(mip->start, mip->maplen) != 0)
108 mip->mapoff = offset & ~((off_t)TAILMAPLEN - 1);
109 mip->maplen = TAILMAPLEN;
110 if ((off_t)mip->maplen > mip->maxoff - mip->mapoff)
111 mip->maplen = mip->maxoff - mip->mapoff;
112 if (mip->maplen <= 0)
114 if ((mip->start = mmap(NULL, mip->maplen, PROT_READ, MAP_SHARED,
115 mip->fd, mip->mapoff)) == MAP_FAILED)