120 lines
3.4 KiB
C
120 lines
3.4 KiB
C
/*-
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* Copyright (c) 1991, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Edward Sze-Tyan Wang.
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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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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#ifndef lint
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static const char sccsid[] = "@(#)misc.c 8.1 (Berkeley) 6/6/93";
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#endif
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/mman.h>
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#include <err.h>
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include "extern.h"
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void
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ierr()
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{
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warn("%s", fname);
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rval = 1;
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}
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void
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oerr()
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{
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err(1, "stdout");
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}
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/*
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* Print `len' bytes from the file associated with `mip', starting at
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* absolute file offset `startoff'. May move map window.
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*/
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int
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mapprint(struct mapinfo *mip, off_t startoff, off_t len)
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{
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int n;
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while (len > 0) {
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if (startoff < mip->mapoff || startoff >= mip->mapoff +
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mip->maplen) {
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if (maparound(mip, startoff) != 0)
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return (1);
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}
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n = (mip->mapoff + mip->maplen) - startoff;
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if (n > len)
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n = len;
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WR(mip->start + (startoff - mip->mapoff), n);
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startoff += n;
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len -= n;
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}
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return (0);
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}
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/*
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* Move the map window so that it contains the byte at absolute file
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* offset `offset'. The start of the map window will be TAILMAPLEN
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* aligned.
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*/
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int
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maparound(struct mapinfo *mip, off_t offset)
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{
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if (mip->start != NULL && munmap(mip->start, mip->maplen) != 0)
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return (1);
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mip->mapoff = offset & ~((off_t)TAILMAPLEN - 1);
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mip->maplen = TAILMAPLEN;
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if (mip->maplen > mip->maxoff - mip->mapoff)
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mip->maplen = mip->maxoff - mip->mapoff;
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if (mip->maplen <= 0)
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abort();
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if ((mip->start = mmap(NULL, mip->maplen, PROT_READ, MAP_SHARED,
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mip->fd, mip->mapoff)) == MAP_FAILED)
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return (1);
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return (0);
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}
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