209e49b2ff611e7d61ff58e13756ae67f51be550Chris Love/*
209e49b2ff611e7d61ff58e13756ae67f51be550Chris Love * Copyright (c) 1991, 1993
209e49b2ff611e7d61ff58e13756ae67f51be550Chris Love * The Regents of the University of California. All rights reserved.
209e49b2ff611e7d61ff58e13756ae67f51be550Chris Love *
209e49b2ff611e7d61ff58e13756ae67f51be550Chris Love * This code is derived from software contributed to Berkeley by
209e49b2ff611e7d61ff58e13756ae67f51be550Chris Love * Edward Sze-Tyan Wang.
209e49b2ff611e7d61ff58e13756ae67f51be550Chris Love *
209e49b2ff611e7d61ff58e13756ae67f51be550Chris Love * Redistribution and use in source and binary forms, with or without
209e49b2ff611e7d61ff58e13756ae67f51be550Chris Love * modification, are permitted provided that the following conditions
209e49b2ff611e7d61ff58e13756ae67f51be550Chris Love * are met:
209e49b2ff611e7d61ff58e13756ae67f51be550Chris Love * 1. Redistributions of source code must retain the above copyright
209e49b2ff611e7d61ff58e13756ae67f51be550Chris Love * notice, this list of conditions and the following disclaimer.
209e49b2ff611e7d61ff58e13756ae67f51be550Chris Love * 2. Redistributions in binary form must reproduce the above copyright
209e49b2ff611e7d61ff58e13756ae67f51be550Chris Love * notice, this list of conditions and the following disclaimer in the
209e49b2ff611e7d61ff58e13756ae67f51be550Chris Love * documentation and/or other materials provided with the distribution.
209e49b2ff611e7d61ff58e13756ae67f51be550Chris Love * 4. Neither the name of the University nor the names of its contributors
209e49b2ff611e7d61ff58e13756ae67f51be550Chris Love * may be used to endorse or promote products derived from this software
209e49b2ff611e7d61ff58e13756ae67f51be550Chris Love * without specific prior written permission.
209e49b2ff611e7d61ff58e13756ae67f51be550Chris Love *
209e49b2ff611e7d61ff58e13756ae67f51be550Chris Love * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
209e49b2ff611e7d61ff58e13756ae67f51be550Chris Love * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
209e49b2ff611e7d61ff58e13756ae67f51be550Chris Love * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
209e49b2ff611e7d61ff58e13756ae67f51be550Chris Love * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
209e49b2ff611e7d61ff58e13756ae67f51be550Chris Love * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
209e49b2ff611e7d61ff58e13756ae67f51be550Chris Love * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
209e49b2ff611e7d61ff58e13756ae67f51be550Chris Love * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
209e49b2ff611e7d61ff58e13756ae67f51be550Chris Love * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
209e49b2ff611e7d61ff58e13756ae67f51be550Chris Love * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
209e49b2ff611e7d61ff58e13756ae67f51be550Chris Love * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
209e49b2ff611e7d61ff58e13756ae67f51be550Chris Love * SUCH DAMAGE.
209e49b2ff611e7d61ff58e13756ae67f51be550Chris Love */
209e49b2ff611e7d61ff58e13756ae67f51be550Chris Love
209e49b2ff611e7d61ff58e13756ae67f51be550Chris Love#include <sys/types.h>
209e49b2ff611e7d61ff58e13756ae67f51be550Chris Love#include <sys/stat.h>
209e49b2ff611e7d61ff58e13756ae67f51be550Chris Love#include <sys/mman.h>
209e49b2ff611e7d61ff58e13756ae67f51be550Chris Love
209e49b2ff611e7d61ff58e13756ae67f51be550Chris Love#include <err.h>
209e49b2ff611e7d61ff58e13756ae67f51be550Chris Love#include <errno.h>
209e49b2ff611e7d61ff58e13756ae67f51be550Chris Love#include <stdio.h>
209e49b2ff611e7d61ff58e13756ae67f51be550Chris Love#include <stdlib.h>
209e49b2ff611e7d61ff58e13756ae67f51be550Chris Love#include <string.h>
209e49b2ff611e7d61ff58e13756ae67f51be550Chris Love#include <unistd.h>
209e49b2ff611e7d61ff58e13756ae67f51be550Chris Love
209e49b2ff611e7d61ff58e13756ae67f51be550Chris Love#include "extern.h"
209e49b2ff611e7d61ff58e13756ae67f51be550Chris Love
209e49b2ff611e7d61ff58e13756ae67f51be550Chris Lovevoid
209e49b2ff611e7d61ff58e13756ae67f51be550Chris Loveierr(const char *fname)
209e49b2ff611e7d61ff58e13756ae67f51be550Chris Love{
209e49b2ff611e7d61ff58e13756ae67f51be550Chris Love warn("%s", fname);
209e49b2ff611e7d61ff58e13756ae67f51be550Chris Love rval = 1;
209e49b2ff611e7d61ff58e13756ae67f51be550Chris Love}
209e49b2ff611e7d61ff58e13756ae67f51be550Chris Love
209e49b2ff611e7d61ff58e13756ae67f51be550Chris Lovevoid
209e49b2ff611e7d61ff58e13756ae67f51be550Chris Loveoerr(void)
209e49b2ff611e7d61ff58e13756ae67f51be550Chris Love{
209e49b2ff611e7d61ff58e13756ae67f51be550Chris Love err(1, "stdout");
209e49b2ff611e7d61ff58e13756ae67f51be550Chris Love}
209e49b2ff611e7d61ff58e13756ae67f51be550Chris Love
209e49b2ff611e7d61ff58e13756ae67f51be550Chris Love/*
209e49b2ff611e7d61ff58e13756ae67f51be550Chris Love * Print `len' bytes from the file associated with `mip', starting at
209e49b2ff611e7d61ff58e13756ae67f51be550Chris Love * absolute file offset `startoff'. May move map window.
209e49b2ff611e7d61ff58e13756ae67f51be550Chris Love */
209e49b2ff611e7d61ff58e13756ae67f51be550Chris Loveint
209e49b2ff611e7d61ff58e13756ae67f51be550Chris Lovemapprint(struct mapinfo *mip, off_t startoff, off_t len)
209e49b2ff611e7d61ff58e13756ae67f51be550Chris Love{
209e49b2ff611e7d61ff58e13756ae67f51be550Chris Love int n;
209e49b2ff611e7d61ff58e13756ae67f51be550Chris Love
209e49b2ff611e7d61ff58e13756ae67f51be550Chris Love while (len > 0) {
209e49b2ff611e7d61ff58e13756ae67f51be550Chris Love if (startoff < mip->mapoff || startoff >= mip->mapoff +
209e49b2ff611e7d61ff58e13756ae67f51be550Chris Love (off_t)mip->maplen) {
209e49b2ff611e7d61ff58e13756ae67f51be550Chris Love if (maparound(mip, startoff) != 0)
209e49b2ff611e7d61ff58e13756ae67f51be550Chris Love return (1);
209e49b2ff611e7d61ff58e13756ae67f51be550Chris Love }
209e49b2ff611e7d61ff58e13756ae67f51be550Chris Love n = (mip->mapoff + mip->maplen) - startoff;
209e49b2ff611e7d61ff58e13756ae67f51be550Chris Love if (n > len)
209e49b2ff611e7d61ff58e13756ae67f51be550Chris Love n = len;
209e49b2ff611e7d61ff58e13756ae67f51be550Chris Love WR(mip->start + (startoff - mip->mapoff), n);
209e49b2ff611e7d61ff58e13756ae67f51be550Chris Love startoff += n;
209e49b2ff611e7d61ff58e13756ae67f51be550Chris Love len -= n;
209e49b2ff611e7d61ff58e13756ae67f51be550Chris Love }
209e49b2ff611e7d61ff58e13756ae67f51be550Chris Love return (0);
209e49b2ff611e7d61ff58e13756ae67f51be550Chris Love}
209e49b2ff611e7d61ff58e13756ae67f51be550Chris Love
209e49b2ff611e7d61ff58e13756ae67f51be550Chris Love/*
209e49b2ff611e7d61ff58e13756ae67f51be550Chris Love * Move the map window so that it contains the byte at absolute file
209e49b2ff611e7d61ff58e13756ae67f51be550Chris Love * offset `offset'. The start of the map window will be TAILMAPLEN
209e49b2ff611e7d61ff58e13756ae67f51be550Chris Love * aligned.
209e49b2ff611e7d61ff58e13756ae67f51be550Chris Love */
209e49b2ff611e7d61ff58e13756ae67f51be550Chris Loveint
209e49b2ff611e7d61ff58e13756ae67f51be550Chris Lovemaparound(struct mapinfo *mip, off_t offset)
209e49b2ff611e7d61ff58e13756ae67f51be550Chris Love{
209e49b2ff611e7d61ff58e13756ae67f51be550Chris Love
209e49b2ff611e7d61ff58e13756ae67f51be550Chris Love if (mip->start != NULL && munmap(mip->start, mip->maplen) != 0)
209e49b2ff611e7d61ff58e13756ae67f51be550Chris Love return (1);
209e49b2ff611e7d61ff58e13756ae67f51be550Chris Love
209e49b2ff611e7d61ff58e13756ae67f51be550Chris Love mip->mapoff = offset & ~((off_t)TAILMAPLEN - 1);
209e49b2ff611e7d61ff58e13756ae67f51be550Chris Love mip->maplen = TAILMAPLEN;
209e49b2ff611e7d61ff58e13756ae67f51be550Chris Love if ((off_t)mip->maplen > mip->maxoff - mip->mapoff)
209e49b2ff611e7d61ff58e13756ae67f51be550Chris Love mip->maplen = mip->maxoff - mip->mapoff;
209e49b2ff611e7d61ff58e13756ae67f51be550Chris Love if (mip->maplen == 0)
209e49b2ff611e7d61ff58e13756ae67f51be550Chris Love abort();
209e49b2ff611e7d61ff58e13756ae67f51be550Chris Love if ((mip->start = mmap(NULL, mip->maplen, PROT_READ, MAP_SHARED,
209e49b2ff611e7d61ff58e13756ae67f51be550Chris Love mip->fd, mip->mapoff)) == MAP_FAILED)
209e49b2ff611e7d61ff58e13756ae67f51be550Chris Love return (1);
209e49b2ff611e7d61ff58e13756ae67f51be550Chris Love
209e49b2ff611e7d61ff58e13756ae67f51be550Chris Love return (0);
209e49b2ff611e7d61ff58e13756ae67f51be550Chris Love}